projector

Abstract

In projectors, the goal is to achieve a balance between color gamut and brightness while reducing color breakup. [Solution] The projector comprises a first light source device that emits first-color light, a first liquid crystal panel having multiple lines, and a first optical scanning device that scans the first-color light along the column direction. In each of the multiple subframes included in one frame, voltages corresponding to different color data are written for each line, from the first line to the last line, and the first-color light is scanned from the first line to the last line. During the period in which voltages corresponding to red data are written, red light is emitted from the first light source device as first-color light. During the period in which voltages corresponding to green data are written, green light is emitted from the first light source device as first-color light. During the period in which voltages corresponding to blue data are written, blue light is emitted from the first light source device as first-color light.

Description

Technical Field

[0005] , ,

[0001] The present invention relates to a projector.

Background Art

[0002] As a projector which is an image display device, there has been proposed a device which illuminates a liquid crystal panel with color light by temporally scanning illumination light emitted from a light source device on a modulation surface of the liquid crystal panel such as a liquid crystal panel, and projects the image light emitted from the liquid crystal panel onto a projection surface such as a screen by a projection optical system.

[0003] For example, Patent Document 1 discloses a projector in which a black display period is set within an image formation period of a vertical synchronization signal along a scanning direction for scanning liquid crystal panel illumination light of a liquid crystal panel. That is, in the projector disclosed in Patent Document 1, during a period corresponding to at least one or more sub-frames among periods corresponding to a plurality of sub-frames of the liquid crystal panel, the output of a light emitting element of the light source device is controlled to be turned off.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the conventional technology described above, a projected image is formed by illuminating the subframe with red, blue, and green light sources. If the emission period (color rotation frequency) for each color light relative to the duration of one frame is fast, color breakup can be suppressed. However, increasing the color rotation frequency requires increasing the driving frequency of the liquid crystal panel. Under the condition that the driving frequency of the liquid crystal panel and the response speed of the liquid crystal are almost equal, both color gamut and brightness can be achieved. However, the response speed of a typical liquid crystal is quite slow, at about 3ms. Therefore, increasing the color rotation frequency means that either color gamut or brightness will be sacrificed. For the reasons stated above, simply increasing the color rotation frequency makes it difficult to achieve both color gamut and brightness while reducing color breakup. [Means for solving the problem]

[0006] A projector according to one aspect of the present invention comprises: a first light source device that emits one of red light, green light, and blue light as a first color light; a first liquid crystal panel having a plurality of lines arranged at predetermined intervals along the column direction and extending in the row direction, wherein the lines are defined as arrays of pixels connected to a single scan line; and a first optical scanning device that scans the first color light incident on the first liquid crystal panel along the column direction of the first liquid crystal panel. In each of the multiple subframes included in one frame, in the first liquid crystal panel, voltages corresponding to color data such as red data, green data, and blue data are written to the pixels belonging to each line in order from the first line to the last line, and voltages corresponding to different color data are written for each line or more lines. The first color light incident on the first liquid crystal panel is scanned from the first line to the last line, and during the period in which the voltage corresponding to the red data is written to the first liquid crystal panel, the red light is emitted from the first light source device as the first color light. During the period in which the voltage corresponding to the green data is written to the first liquid crystal panel, the green light is emitted from the first light source device as the first color light. During the period in which the voltage corresponding to the blue data is written to the first liquid crystal panel, the blue light is emitted from the first light source device as the first color light. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of the projector according to the first embodiment. [Figure 2] This is a schematic diagram illustrating the behavior of the first optical scanning device. [Figure 3] This is a schematic diagram illustrating the behavior of the first optical scanning device. [Figure 4] This is a schematic diagram illustrating the behavior of the first optical scanning device. [Figure 5] This is a timing chart showing the operation of the comparative example. [Figure 6] This is a timing chart showing the operation of the projector according to the first embodiment. [Figure 7]This is a timing chart showing a modified example of the operation of the projector according to the first embodiment. [Figure 8] This is a timing chart showing the operation of the projector in the second embodiment. [Figure 9] This is a timing chart showing the operation of the projector according to the third embodiment. [Figure 10] This is a schematic diagram of the projector according to the fourth embodiment. [Figure 11] This is a schematic diagram of the projector according to the fifth embodiment. [Modes for carrying out the invention]

[0008] Embodiments of this disclosure will be described below with reference to the drawings. In the drawings referred to below, the dimensional scale may be changed depending on the component in order to make each component easier to see.

[0009] [First Embodiment] First, a first embodiment of the present disclosure will be described. Figure 1 is a schematic diagram of a projector 201 of the first embodiment. The projector 201 is a single-chip projector equipped with one liquid crystal panel as the liquid crystal panel. As shown in Figure 1, the projector 201 includes an optical device 10 and a control device 100. The optical device 10 includes a first light source device 20, a first optical scanning device 40, a first liquid crystal panel 60, and a projection optical system 80.

[0010] The first light source device 20 emits one of the following as the first color light L1: red light RL, green light GL, and blue light BL. In the following description, the axis parallel to the optical axis AX and principal ray of the first color light L1 emitted from the first light source device 20 is defined as the Z axis, with one side parallel to the Z axis being the -Z side and the other side parallel to the Z axis being the +Z side. One axis perpendicular to the Z axis is defined as the X axis, with one side parallel to the X axis being the -X side and the other side parallel to the X axis being the +X side. The axis perpendicular to the Z axis and the X axis is defined as the Y axis, with one side parallel to the Y axis being the -Y side and the other side parallel to the Y axis being the +Y side.

[0011] The first light source device 20 includes a light emitting element 22 that emits blue light BL, a light emitting element 23 that emits green light GL, a light emitting element 24 that emits red light RL, collimating lenses 27, 28, 29, and dichroic mirrors 31, 32.

[0012] The light emitting element 22 emits blue light BL from the emission surface 22e along the Z axis to the +Z side. The light emitting element 22 is, for example, a blue laser diode (LD) or a blue light emitting diode (LED).

[0013] The collimating lens 27 is disposed on the optical path of the blue light BL emitted from the light emitting element 22, is disposed at the same position as the emission surface 22e of the light emitting element 22 in the X and Y axes, and is disposed on the +Z side of the emission surface 22e of the light emitting element 22. The central axis of the collimating lens 27 overlaps with the optical axis of the blue light BL emitted from the light emitting element 22. The collimating lens 27 emits the blue light BL emitted from the light emitting element 22 as parallel light parallel to the Z axis along the optical axis AX.

[0014] The collimating lens 27 is, for example, a biconvex lens. Note that the collimating lens 27 may be a plano-convex lens having a flat incident surface parallel to the XY plane and a convex emission surface on the +Z side. In FIG. 1, the collimating lens 27 is disposed away from the emission surface 22e of the light emitting element 22. However, if the collimating lens 27 is a plano-convex lens, the collimating lens 27 may be in contact with the emission surface 22e of the light emitting element 22.

[0015] The light emitting element 23 is disposed at the same position as the light emitting element 22 in the X axis, is disposed on the -Y side of the light emitting element 22, and is disposed on the +Z side of the light emitting element 22 and on the -Z side of the light transmissive member 42 of the first light scanning device 40. The light emitting element 23 emits green light GL from the emission surface 23e along the Y axis to the +Y side. The light emitting element 23 is, for example, a green LD or a green LED.

[0016] The collimating lens 28 is disposed on the optical path of the green light GL emitted from the light emitting element 23, is disposed at the same position as the emission surface 23e of the light emitting element 23 in the X-axis and Z-axis, and is disposed between the emission surface 23e of the light emitting element 23 and the emission surface 22e of the light emitting element 22 in the Y-axis. The central axis of the collimating lens 28 overlaps with the optical axis of the green light GL emitted from the light emitting element 23 and intersects with the central axis of the collimating lens 27. The collimating lens 28 emits the green light GL emitted from the light emitting element 23 as parallel light parallel to the Y-axis to the +Y side.

[0017] The collimating lens 28 is, for example, a biconvex lens. Note that the collimating lens 28 may be a plano-convex lens having a flat incident surface parallel to the XZ plane including the X-axis and Z-axis and an emission surface convex on the +Y side. In FIG. 1, the collimating lens 28 is disposed away from the emission surface 23e of the light emitting element 23. However, if the collimating lens 28 is a plano-convex lens, the collimating lens 28 may be in contact with the emission surface 23e of the light emitting element 23.

[0018] The light emitting element 24 is disposed at the same position as the light emitting elements 22 and 23 in the X-axis, is disposed on the -Y side of the light emitting element 22, and is disposed on the +Z side of the light emitting element 23 and on the -Z side of the light transmissive member 42 of the first light scanning device 40. The light emitting element 24 emits red light RL from the emission surface 24e to the +Y side along the Y-axis. The light emitting element 24 is, for example, a red LD or a red LED.

[0019] The collimating lens 29 is disposed on the optical path of the red light RL emitted from the light emitting element 24, is disposed at the same position as the emission surface 24e of the light emitting element 24 in the X-axis and Z-axis, and is disposed between the emission surface 24e of the light emitting element 24 and the emission surface 22e of the light emitting element 22 in the Y-axis. The central axis of the collimating lens 29 overlaps with the optical axis of the red light RL emitted from the light emitting element 24 and intersects with the central axis of the collimating lens 27. The collimating lens 29 emits the red light RL emitted from the light emitting element 24 as parallel light parallel to the Y-axis to the +Y side.

[0020] The parallelizing lens 29 is, for example, a biconvex lens. Alternatively, the parallelizing lens 29 may be a plano-convex lens having an incident surface that is flat parallel to the XZ plane including the X and Z axes, and an exit surface that is convex to the +Y side. In Figure 1, the parallelizing lens 29 is positioned away from the exit surface 24e of the light-emitting element 24, but if the parallelizing lens 29 is a plano-convex lens, it may be in contact with the exit surface 24e of the light-emitting element 24.

[0021] The dichroic mirror 31 is positioned in the region where the optical path of the blue light BL emitted from the parallelizing lens 27 and the optical path of the green light GL emitted from the parallelizing lens 28 overlap. The center of the dichroic mirror 31 in the XY plane approximately coincides with the intersection of the optical axis of the blue light BL emitted from the light-emitting element 22 and the optical axis of the green light GL emitted from the light-emitting element 23.

[0022] The dichroic mirror 31 has a reflective surface that transmits blue light BL and reflects green light GL. The reflective surface of the dichroic mirror 31 is inclined so that as you move from the -Z side to the +Z side when viewed along the X-axis, you move from the -Y side to the +Y side. The blue light BL emitted from the parallelizing lens 27 passes through the dichroic mirror 31 and is emitted along the Z-axis towards the +Z side. The green light GL emitted from the parallelizing lens 28 is incident on the dichroic mirror 31 and is reflected along the Z-axis towards the +Z side by the reflective surface of the dichroic mirror 31.

[0023] The dichroic mirror 32 is positioned in the region where the optical paths of the blue light BL and green light GL emitted from the dichroic mirror 31 overlap with the optical path of the red light RL emitted from the parallelizing lens 29. The center of the dichroic mirror 32 in the XY plane approximately coincides with the intersection of the optical axis of the blue light BL emitted from the light-emitting element 22 and the optical axis of the red light RL emitted from the light-emitting element 24.

[0024] The dichroic mirror 32 has a reflective surface that transmits blue light BL and green light GL and reflects red light RL. The reflective surface of the dichroic mirror 32 is inclined so that as you move from the -Z side to the +Z side when viewed along the X-axis, you move from the -Y side to the +Y side. The blue light BL and green light GL emitted from the dichroic mirror 32 are transmitted through the dichroic mirror 32 and emitted along the Z-axis towards the +Z side. The red light RL emitted from the parallelizing lens 29 is incident on the dichroic mirror 32 and reflected along the Z-axis towards the +Z side by the reflective surface of the dichroic mirror 32.

[0025] As can be understood from the above explanation, when only light-emitting element 22 emits light from among light-emitting elements 22, 23, and 24, the blue light BL emitted from light-emitting element 22 is emitted from the dichroic mirror 32 as the first color light L1. When only light-emitting element 23 emits light from among light-emitting elements 22, 23, and 24, the green light GL emitted from light-emitting element 23 is emitted from the dichroic mirror 32 as the first color light L1. When only light-emitting element 24 emits light from among light-emitting elements 22, 23, and 24, the red light RL emitted from light-emitting element 24 is emitted from the dichroic mirror 32 as the first color light L1. In this way, by individually controlling the emission periods of light-emitting elements 22, 23, and 24, one of the red light RL, green light GL, and blue light BL is emitted from the first light source device 20 as the first color light L1. The emission periods of light-emitting elements 22, 23, and 24 are controlled by the control device 100 described later.

[0026] The first color light L1 is emitted from the first light source device 20 along the optical axis AX towards the +Z side and incident on the light-transmitting member 42 of the first optical scanning device 40. The first optical scanning device 40 is positioned on the optical path of the first color light L1 emitted from the first light source device 20 and is positioned towards the +Z side of the dichroic mirror 32. The first optical scanning device 40 scans the first color light L1 incident on the first liquid crystal panel 60 along the column direction of the first liquid crystal panel 60. The column direction of the first liquid crystal panel 60 is the direction along the Y axis.

[0027] The first optical scanning device 40 includes a light-transmitting member 42 and a rotating device such as a motor (not shown). The light-transmitting member 42 is positioned on the optical path of the first color light L1 emitted from the first light source device 20 and is positioned on the +Z side of the dichroic mirror 32. The light-transmitting member 42 is formed in a columnar shape. The central axis JX of the light-transmitting member 42 is parallel to the X axis and intersects the optical axis AX, or passes near the optical axis AX. The light-transmitting member 42 is a polygonal prism having a central axis JX.

[0028] The translucent member 42 has two end faces 51 and 52 that intersect the central axis JX and are parallel to the YZ plane including the Y and Z axes, and a plurality of side faces 54. The end faces 51 and 52 are positioned relatively on the +X side. The plurality of side faces 54 correspond to the incident surface, exit surface, and second surface described later, and are positioned on the -X side of the end face 51, overlapping with the end face 51 when viewed along the X axis. The end faces 51 and 52 have a polygonal shape centered on the central axis JX.

[0029] The number of sides 54 is the same as the number of corners and edges of end faces 51 and 52. Side 54 connects each of the multiple outer edges of end face 51 and the outer edges of end face 52 that overlap with the aforementioned outer edges when viewed along the X-axis.

[0030] The end faces 51 and 52 have, for example, a regular quadrilateral shape and are the same shape, size, and area as the other. The light-transmitting member 42 has two end faces 51 and 52 and four side faces 54A, 54B, 54C, and 54D. The side faces 54A, 54B, 54C, and 54D are the same size and area as the other. The size and area of ​​the side faces 54A, 54B, 54C, and 54D are appropriately larger than the irradiation area centered on the optical axis AX of the first color light L1 emitted from the first light source device 20, according to the scanning area of ​​the first color light L1, as will be described later.

[0031] When viewed along the X-axis, the sides 54A and 54C face each other across the central axis JX and are parallel to each other. The sides 54B and 54D face each other across the central axis JX and are parallel to each other. In this specification, the parallelism of the two sides 54 means that the angle between the two sides is within the range of 0° to 5°, taking into consideration the processing accuracy of the material of the translucent member 42, the allowable range of parallelism of the first color light L1, etc.

[0032] The light-transmitting member 42 is positioned so as to be rotatable about the central axis JX. The central axis JX corresponds to the rotation axis CX of the light-transmitting member 42. The light-transmitting member 42 rotates about the rotation axis CX, transmits the first color light L1 incident from the -Z side along the Z axis and optical axis AX, and emits it to the +Z side.

[0033] In this specification, the state in which the translucent member 42 is rotating about the rotation axis CX may be described as the rotational state. In the rotational state of the translucent member 42, the side surface 54 into which the first color light L1 emitted from the first light source device 20 enters the translucent member 42 is not fixed to one of the four side surfaces 54A, 54B, 54C, 54D, but is any one or two of the four side surfaces 54A, 54B, 54C, 54D, and changes over time.

[0034] Furthermore, the number of sides 54 on the light-transmitting member 42 is not limited to four, but is preferably 2 × m, where m is a natural number of 2 or more. If the number of sides 54 is an even number of four or more, all sides 54 are parallel to the opposing sides 54, which suppresses the generation of stray light of the first color light L1 transmitted through the light-transmitting member 42 and improves the light utilization efficiency of the projector 201.

[0035] The material of the light-transmitting member 42 is a material that is light-transmitting to the first color of light L1, and is, for example, an optical glass such as BK7 which is borosilicate crown glass or B270 which is high transparency crown glass, quartz, transparent resin, etc.

[0036] The first liquid crystal panel 60 is positioned on the optical path of the first color light L1 emitted from the light-transmitting member 42 of the first optical scanning device 40 and within the region where the first color light L1 is scanned, and is positioned on the +Z side of the light-transmitting member 42. The first liquid crystal panel 60 has a modulation surface 64 parallel to the XY plane. The position, size, area, and shape of the modulation surface 64 in the XY plane are equivalent to the region that can be illuminated by the first color light L1 when scanned by the light-transmitting member 42, and are equivalent to the range in the XY plane where an appropriate margin region is secured outside the aforementioned illumination region of the first color light L1.

[0037] The first liquid crystal panel 60 modulates the first color light L1 incident from the -Z side by the first optical scanning device 40 with an electrical signal input from the control device 100 according to the image information of the projection target, as described later, and converts it into first image light IL1. The first liquid crystal panel 60 is, for example, a transmissive liquid crystal panel. The first liquid crystal panel 60 has a plurality of pixels arranged two-dimensionally along the X and Y axes in the XY plane. The plurality of pixels of the first liquid crystal panel 60 constitute a modulation plane 64.

[0038] Multiple pixels of the first liquid crystal panel 60 are equipped with switching elements. The switching elements are, for example, polysilicon thin-film transistors (TFTs). Each pixel's switching element is supplied with an electrical signal from the control device 100 corresponding to the brightness and intensity of red, green, and blue light at the relative position of each pixel on the modulation plane 64 in the image projected by the projector 201.

[0039] Each pixel of the first liquid crystal panel 60 modulates the vibration direction of the first color light L1 by the operation of a switching element corresponding to the aforementioned electrical signal, and emits the modulated first color light L1 as the first image light IL1. The first liquid crystal panel 60 emits the first image light IL1, which is generated by the modulation of the first color light L1, along the optical axis AX and the Z axis towards the +Z side.

[0040] The driving method for the first liquid crystal panel 60 is not particularly limited, but may include, for example, the twisted nematic (TN) method, the vertical alignment (VA) method, or the in-plane switching (IPS) method.

[0041] The first liquid crystal panel 60 has a plurality of lines arranged at predetermined intervals along the column direction and extending in the row direction. The row direction of the first liquid crystal panel 60 is the direction along the X-axis. In this specification, "line" is defined as an array of pixels connected to a single scan line.

[0042] The projection optical system 80 is positioned on the optical path of the first image light IL1 emitted from the first liquid crystal panel 60, and is located on the +Z side of the first liquid crystal panel 60. The projection optical system 80 magnifies and projects the first image light IL1 generated by the first liquid crystal panel 60 toward a projection surface such as a screen. The projection optical system 80 is composed of a plurality of optical lenses arranged along the Z axis. Optical lenses include, for example, plano-convex lenses, plano-concave lenses, biconvex lenses, biconcave lenses, meniscus lenses, aspherical lenses, or free-form lenses.

[0043] An output-side polarizer (not shown) may be placed in the optical path of the first image light IL1 between the first liquid crystal panel 60 and the projection optical system 80. The output-side polarizer transmits specific linearly polarized light from the first image light IL1 emitted from the first liquid crystal panel 60 and absorbs or reflects polarization components other than the specific linearly polarized light. If an absorption-type polarizer is used as the output-side polarizer, the reflected light from the output-side polarizer to the -Z side is reduced, the generation of stray light in the projector 201 is suppressed, and the light utilization efficiency is improved.

[0044] The control device 100 controls the first light source device 20, the first optical scanning device 40, and the first liquid crystal panel 60. The control device 100 includes light source output control devices 111, 112, and 113, a rotation control device 120, a drive control device 130, a central processing unit 140, a user interface 150, an image processing circuit 160, and an image interface 170.

[0045] The light source output control device 111 is electrically connected to the light-emitting element 22 of the first light source device 20 by wire or wireless means, and controls the amount of blue light BL emitted from the light-emitting element 22 and the duration of light emission. Specifically, the light source output control device 111 controls the amount of blue light BL and the duration of light emission by outputting an electrical signal to the light-emitting element 22 regarding the drive voltage or drive current of the light-emitting element 22. The light source output control device 111 is, for example, an LD driver or an LED driver. The driver, which is the light source output control device 111, stores and saves a program of periodic drive voltage values ​​or drive current values ​​to the light-emitting element 22 corresponding to the elapsed time and time t.

[0046] The light source output control device 112 is electrically connected to the light-emitting element 23 of the first light source device 20 by wire or wireless means, and controls the amount of green light GL emitted from the light-emitting element 23 and the duration of emission. Specifically, the light source output control device 112 controls the amount of green light GL and the duration of emission by outputting an electrical signal to the light-emitting element 23 relating to the drive voltage or drive current of the light-emitting element 23. The light source output control device 112 is, for example, an LD driver or an LED driver. The driver, which is the light source output control device 112, stores and saves a program of periodic drive voltage values ​​or drive current values ​​to the light-emitting element 23 corresponding to the elapsed time and time t.

[0047] The light source output control device 113 is electrically connected to the light-emitting element 24 of the first light source device 20 by wire or wireless means, and controls the amount of red light RL emitted from the light-emitting element 24 and the duration of light emission. Specifically, the light source output control device 113 controls the amount of red light RL and the duration of light emission by outputting an electrical signal to the light-emitting element 24 regarding the drive voltage or drive current of the light-emitting element 24. The light source output control device 113 is, for example, an LD driver or an LED driver. The driver, which is the light source output control device 113, stores and saves a program of periodic drive voltage values ​​or drive current values ​​to the light-emitting element 24 corresponding to the elapsed time and time t.

[0048] The rotation control device 120 is electrically connected to the translucent member 42 of the first optical scanning device 40 via a motor, either by wire or wireless means, and controls the rotation speed of the translucent member 42 around the rotation axis CX. The rotation control device 120 is composed of, for example, a motor driver.

[0049] The drive control device 130 is electrically connected to the light source output control devices 111, 112, 113 and the rotation control device 120, and is electrically connected to the first liquid crystal panel 60 by wire or wireless connection. The drive control device 130 outputs electrical signals to each of the light source output control devices 111, 112, 113 and the rotation control device 120, and controls the position, region, and timing in the XY plane where one of the blue light BL, green light GL, and red light RL is scanned as the first color light L1 by the first optical scanning device 40 and illuminates the modulation surface 64 of the first liquid crystal panel 60. The drive control device 130 supplies electrical signals to each pixel on the modulation surface 64 in accordance with the illumination position, illumination region, and timing of the first color light L1.

[0050] The drive control device 130 is, for example, a processor. The processor, which is the drive control device 130, stores and saves information such as the timing for supplying drive voltage values ​​or drive current values ​​to the light-emitting elements 22, 23, and 24, the timing for increasing or decreasing the rotation speed of the light-transmitting member 42, and the timing for supplying a drive voltage with a modulation amount of the first color light L1 suitable for each pixel of the first liquid crystal panel 60.

[0051] The Central Processing Unit (CPU) 140 is electrically connected to the drive control unit 130 by wire or wireless connection. The Central Processing Unit 140 transmits video information and drive information to the drive control unit 130. The Central Processing Unit 140 receives frame information from the video processing circuit 160 and information such as the refresh rate of the first liquid crystal panel 60 from the User Interface (UI) 150. The refresh rate of the first liquid crystal panel 60 is arbitrarily set by the user of the projector 201 from a set of pre-defined options, for example, 60Hz or 90Hz.

[0052] The user interface 150 is electrically connected to the central processing unit 140 by wire or wireless means. The user interface 150 transmits information such as the refresh rate to the central processing unit 140. The user interface 150 is, for example, an input device or tablet terminal installed on the projector 201.

[0053] The video processing circuit 160 is electrically connected to the central processing unit 140 by wire or wireless connection. The video processing circuit 160 receives video information from the video interface 170, decomposes the received video information into color-specific frame information, and transmits the frame information for each color of the video or image to the central processing unit 140. The video processing circuit 160 has, for example, a VRAM (Video Random Access Memory) which is a memory dedicated to video processing.

[0054] The video interface 170 is electrically connected to the video processing circuit 160 by wire or wireless connection. The video interface 170 transmits image information and video information of the projection target by the projector 201 to the video processing circuit 160.

[0055] Next, the scanning of the first color light L1 by the first optical scanning device 40 will be described. When viewed from the +X side, that is, the side in front of the plane of Figure 1, to the -X side, that is, the side behind the plane of Figure 1, the light-transmitting member 42 of the first optical scanning device 40 rotates clockwise around the rotation axis CX, for example, as indicated by the arrow.

[0056] Figure 1 shows the first state, or initial state, of the translucent member 42 of the first optical scanning device 40 in its rotational state. In the first state, the side surface 54A of the translucent member 42 is located furthest to the -Z side of the four side surfaces 54 and is parallel to the XY plane. The rotation angle ω is defined as the counterclockwise angle from a virtual line TX perpendicular to the side surface 54A, passing through the central axis JX and the rotation axis CX, to an axis PX that starts from the central axis JX and the rotation axis CX and extends parallel to the Z axis and toward the -Z side. The actual first color light L1 has a predetermined luminous beam width in the X axis, Y axis, and XY plane. In describing the scanning and behavior of the first color light L1, we focus on the ray WBM on the optical axis AX of the first color light L1.

[0057] As shown in Figure 1, in the first state, the rotation angle ω is 0°, and the first color light L1 incident on the translucent member 42 from the -Z side is incident perpendicular to the side surface 54A and therefore does not refract at side surface 54A. The first color light L1 travels parallel to the Z axis, is incident perpendicular to the side surface 54C, does not refract at side surface 54C, and is emitted from side surface 54C along the Z axis towards the +Z side. The ray WBM of the first color light L1 passes through the center of the XY plane of side surface 54A, the central axis JX and the rotation axis CX, and the center of the XY plane of side surface 54C. The distance d between the ray WBM emitted from side surface 54C of the translucent member 42 and the axis QX that extends parallel to the Z axis and towards the +Z side, starting from the central axis JX and the rotation axis CX, is approximately zero.

[0058] Figure 2 is a schematic diagram of the second state, which is the rotation of the translucent member 42 from the first state. As shown in Figure 2, in the second state, the rotation angle ω is greater than 0° and less than 45°. In the second state, the first color light L1 incident on the translucent member 42 from the -Z side is incident at an angle of incidence equivalent to the narrow angle between the perpendicular to the side 54A and the light ray WBM. Therefore, according to the angle of incidence to the side 54A, the refractive index n of the material of the translucent member 42, and Snell's law, the light is refracted on the side 54A toward the -Y side relative to the central axis JX.

[0059] In the second state, as described above, the first color light L1 incident on the interior of the translucent member 42 is refracted at the side surface 54A, incident on the side surface 54C at an angle determined by the angle of incidence of the first color light L1 on side surface 54A, the refractive index n, and Snell's law, refracted at side surface 54C, and emitted from side surface 54C along the Z axis towards the +Z side. The separation distance d in the second state is greater than the separation distance d in the first state.

[0060] Regardless of the rotational state of the translucent member 42, the rotation angle ω determines which one or two sides 54 of the four sides 54A, 54B, 54C, and 54D of the translucent member 42 are incident on by the first color light L1, and the angle of incidence of the first color light L1 incident on one or two sides 54. The separation distance d is determined by the angle of incidence of the first color light L1 to one or two sides 54 according to the rotation angle ω, the refractive index n, and the distance on the Z axis between sides 54A, 54C and sides 54B, 54D, i.e., the length of one side of the polygon of the end faces 51, 52.

[0061] Figure 3 is a schematic diagram of the third state, in which the rotation of the translucent member 42 has progressed further from the second state. As shown in Figure 3, the rotation angle ω is 45°, and the ray WBM of the first color light L1 incident on the translucent member 42 from the -Z side is incident on the corner between sides 54A and 54B. In the third state, the portion of the first color light L1 incident on the translucent member 42 from the -Z side that is on the +Y side of the corner between sides 54A and 54B is refracted at side 54A, similar to the second state, incident on side 54C at an angle determined by the angle of incidence of the first color light L1 to side 54A, the refractive index n, and Snell's law, refracted at side 54C, and exits from side 54C along the Z axis towards the +Z side.

[0062] In the third state, of the first-color light L1 incident on the translucent member 42 from the -Z side, the portion of the first-color light L1 on the -Y side of the angle between sides 54A and 54B is refracted at side 54B, incident on side 54D at an angle determined by the angle of incidence of the first-color light L1 to side 54B, the refractive index n, and Snell's law, refracted at side 54D, and emitted from side 54D along the Z axis towards the +Z side. The separation distance d in the third state is greater than the separation distance d in the second state.

[0063] Figure 4 is a schematic diagram of the fourth state, where the rotation of the translucent member 42 has progressed further from the third state. As shown in Figure 4, in the fourth state, the rotation angle ω is greater than 45° and less than 90°. In the fourth state, the first color light L1 incident on the translucent member 42 from the -Z side is incident at an angle of incidence equivalent to the narrow angle between the perpendicular to the side surface 54B and the light ray WBM. Therefore, according to the angle of incidence to the side surface 54B, refractive index n, and Snell's law, the light is refracted at the side surface 54B to the +Y side of the central axis JX.

[0064] In the fourth state, as described above, the first color light L1 incident on the interior of the translucent member 42 is refracted at the side surface 54B, incident on the side surface 54D at an angle determined by the angle of incidence of the first color light L1 on side surface 54B, the refractive index n, and Snell's law, refracted at side surface 54D, and emitted from side surface 54D along the Z axis towards the +Z side. The separation distance d in the fourth state is less than the separation distance d in the third state.

[0065] Although not shown in the diagram, as the rotation of the translucent member 42 progresses, in the behavior from the first state to the fourth state described above, side surface 54A of the translucent member 42 is replaced by side surface 54B, and side surface 54B is replaced by side surface 54C. Subsequently, in the behavior from the first state to the fourth state described above, side surface 54A of the translucent member 42 is replaced by side surface 54C, and side surface 54B is replaced by side surface 54D. Further after that, in the behavior from the first state to the fourth state described above, side surface 54A of the translucent member 42 is replaced by side surface 54D, and side surface 54B is replaced by side surface 54A.

[0066] As these behaviors cycle, the first color light L1 emitted from the translucent member 42 of the first optical scanning device 40 is scanned along the Y axis (the column direction of the first liquid crystal panel 60). The beam width of the first color light L1 incident on the translucent member 42 in the X axis is greater than the beam width in the Y axis and is equivalent to the size of the modulation surface 64 of the first liquid crystal panel 60 in the X axis, so that the first color light L1 emitted from the translucent member 42 is scanned in the XY plane. In the behaviors from the first to the fourth state described above, the maximum value of the separation distance d is set to be equivalent to half the size of the modulation surface 64 in the Y axis. Based on this, the length and size of one side of the end faces 51, 52 of the translucent member 42 and the refractive index n are appropriately set so that the maximum value of the separation distance d is equivalent to half the size of the modulation surface 64 in the Y axis.

[0067] The above is a description of the configuration of projector 201. Before describing the operation of projector 201, we will now describe the operation of the comparative example to facilitate understanding of the operation of projector 201. Since the operation of the comparative example can also be achieved with projector 201 configured as described above, for the sake of explanation, we will use the configuration of projector 201 to describe the operation of the comparative example.

[0068] Figure 5 is a timing chart showing the operation of the comparative example. In Figure 5, the period T1 from time t1 to time t7 corresponds to one frame. One frame is evenly divided into three subframes. One frame includes the first subframe SF1, the second subframe SF2, and the third subframe SF3. In Figure 5, the period from time t1 to time t3 corresponds to the first subframe SF1, the period from time t3 to time t5 corresponds to the second subframe SF2, and the period from time t5 to time t7 corresponds to the third subframe SF3.

[0069] Each subframe is equally divided into two fields. The first subframe SF1 includes the first field FD1, which is the first half of the first subframe SF1, and the second field FD2, which is the second half of the first subframe SF1. The second subframe SF2 includes the third field FD3, which is the first half of the second subframe SF2, and the fourth field FD4, which is the second half of the second subframe SF2. The third subframe SF3 includes the fifth field FD5, which is the first half of the third subframe SF3, and the sixth field FD6, which is the second half of the third subframe SF3.

[0070] In Figure 5, the period from time t1 to time t2 corresponds to the first field FD1, and the period from time t2 to time t3 corresponds to the second field FD2. The period from time t3 to time t4 corresponds to the third field FD3, and the period from time t4 to time t5 corresponds to the fourth field FD4. The period from time t5 to time t6 corresponds to the fifth field FD5, and the period from time t6 to time t7 corresponds to the sixth field FD6.

[0071] The odd-numbered fields, including the first field FD1, the third field FD3, and the fifth field FD5, are periods in the first liquid crystal panel 60 during which a positive voltage is written to the pixels belonging to each line in order from the first line to the last line. The even-numbered fields, including the second field FD2, the fourth field FD4, and the sixth field FD6, are periods in the first liquid crystal panel 60 during which a negative voltage is written to the pixels belonging to each line in order from the first line to the last line.

[0072] For example, the frame rate in the comparative example is 60fps. That is, one frame corresponding to the period T1 from time t1 to time t7 is approximately 16.7ms. In this case, the duration of one field is approximately 2.78ms. In the following explanation, the reciprocal of the duration of one field will be referred to as the "drive frequency". When the duration of one field is approximately 2.78ms, the drive frequency of the first liquid crystal panel 60 is approximately 360Hz.

[0073] In the comparative example, for the sake of explanation, we will assume that the first liquid crystal panel 60 has six lines. In Figure 5, "Line 1" represents the first line from the +Y side. The first line is the array of pixels connected to the first scan line from the +Y side. "Line 2" represents the second line from the +Y side. The second line is the array of pixels connected to the second scan line from the +Y side. "Line 3" represents the third line from the +Y side. The third line is the array of pixels connected to the third scan line from the +Y side. "Line 4" represents the fourth line from the +Y side. The fourth line is the array of pixels connected to the fourth scan line from the +Y side. "Line 5" represents the fifth line from the +Y side. The fifth line is the array of pixels connected to the fifth scan line from the +Y side. "Line 6" represents the sixth line from the +Y side. The sixth line is the array of pixels connected to the sixth scan line from the +Y side.

[0074] As shown in the timing chart at the top of Figure 5, in the comparative example, in the first field FD1, a voltage corresponding to red data and having positive polarity is written to the pixels belonging to each line sequentially from the first line to the sixth line, and in the second field FD2, a voltage corresponding to red data and having negative polarity is written to the pixels belonging to each line sequentially from the first line to the sixth line. In Figure 5, a voltage corresponding to red data and having positive polarity is represented by "R(+)", and a voltage corresponding to red data and having negative polarity is represented by "R(-)". Red data is image data that represents the red image contained in one frame of an image.

[0075] As shown in the timing chart at the top of Figure 5, in the comparative example, in the third field FD3, a voltage corresponding to green data and having positive polarity is written to the pixels belonging to each line sequentially from the first line to the sixth line, and in the fourth field FD4, a voltage corresponding to green data and having negative polarity is written to the pixels belonging to each line sequentially from the first line to the sixth line. In Figure 5, a voltage corresponding to green data and having positive polarity is represented by "G(+)", and a voltage corresponding to green data and having negative polarity is represented by "G(-)". Green data is image data that represents the green image contained in one frame of an image.

[0076] As shown in the timing chart at the top of Figure 5, in the comparative example, in the fifth field FD5, a voltage corresponding to blue data and having positive polarity is written to the pixels belonging to each line sequentially from the first line to the sixth line, and in the sixth field FD6, a voltage corresponding to blue data and having negative polarity is written to the pixels belonging to each line sequentially from the first line to the sixth line. In Figure 5, a voltage corresponding to blue data and having positive polarity is represented by "B(+)", and a voltage corresponding to blue data and having negative polarity is represented by "B(-)". Blue data is image data that represents the blue image contained in one frame of an image.

[0077] As shown in the timing chart at the bottom of Figure 5, in the comparative example, in the second field FD2, red light RL is emitted from the first light source device 20 as the first color light L1. In the second field FD2, the red light RL emitted from the first light source device 20 is scanned by the first scanning device 40 along the modulation surface 64 of the first liquid crystal panel 60 from the first line to the sixth line.

[0078] More specifically, the first line is illuminated with red light RL during the period when the "R(-)" voltage is written to the first line, the second line is illuminated with red light RL during the period when the "R(-)" voltage is written to the second line, the third line is illuminated with red light RL during the period when the "R(-)" voltage is written to the third line, the fourth line is illuminated with red light RL during the period when the "R(-)" voltage is written to the fourth line, the fifth line is illuminated with red light RL during the period when the "R(-)" voltage is written to the fifth line, and the sixth line is illuminated with red light RL during the period when the "R(-)" voltage is written to the sixth line.

[0079] The timing at which the "R(-)" voltage begins to be written to the second line is later than the timing at which the "R(-)" voltage begins to be written to the first line. Therefore, the timing at which the red light RL begins to illuminate the second line is later than the timing at which the red light RL begins to illuminate the first line. The timing at which the "R(-)" voltage begins to be written to the third line is later than the timing at which the "R(-)" voltage begins to be written to the second line. Therefore, the timing at which the red light RL begins to illuminate the third line is later than the timing at which the red light RL begins to illuminate the second line. The same applies when the red light RL is illuminated to lines 4 through 6.

[0080] As shown in the timing chart at the bottom of Figure 5, in the comparative example, in the fourth field FD4, green light GL is emitted from the first light source device 20 as the first color light L1. In the fourth field FD4, the green light GL emitted from the first light source device 20 is scanned by the first scanning device 40 along the modulation surface 64 of the first liquid crystal panel 60 from the first line to the sixth line.

[0081] More specifically, the first line is illuminated with green light GL during the period when the "G(-)" voltage is written to the first line, the second line is illuminated with green light GL during the period when the "G(-)" voltage is written to the second line, the third line is illuminated with green light GL during the period when the "G(-)" voltage is written to the third line, the fourth line is illuminated with green light GL during the period when the "G(-)" voltage is written to the fourth line, the fifth line is illuminated with green light GL during the period when the "G(-)" voltage is written to the fifth line, and the sixth line is illuminated with green light GL during the period when the "G(-)" voltage is written to the sixth line.

[0082] The timing at which the "G(-)" voltage begins to be written to the second line is later than the timing at which the "G(-)" voltage begins to be written to the first line. Therefore, the timing at which the second line is illuminated with green light GL is later than the timing at which the first line is illuminated with green light GL. The timing at which the "G(-)" voltage begins to be written to the third line is later than the timing at which the "G(-)" voltage begins to be written to the second line. Therefore, the timing at which the third line is illuminated with green light GL is later than the timing at which the second line is illuminated with green light GL. The same applies when green light GL is illuminated to lines 4 through 6.

[0083] As shown in the timing chart at the bottom of Figure 5, in the comparative example, in the sixth field FD6, blue light BL is emitted from the first light source device 20 as the first color light L1. In the sixth field FD6, the blue light BL emitted from the first light source device 20 is scanned by the first scanning device 40 along the modulation surface 64 of the first liquid crystal panel 60 from the first line to the sixth line.

[0084] More specifically, the blue light BL is shone on the first line during the period when the "B(-)" voltage is written to the first line, the blue light BL is shone on the second line during the period when the "B(-)" voltage is written to the second line, the blue light BL is shone on the third line during the period when the "B(-)" voltage is written to the third line, the blue light BL is shone on the fourth line during the period when the "B(-)" voltage is written to the fourth line, the blue light BL is shone on the fifth line during the period when the "B(-)" voltage is written to the fifth line, and the blue light BL is shone on the sixth line during the period when the "B(-)" voltage is written to the sixth line.

[0085] The timing at which the "B(-)" voltage begins to be written to the second line is later than the timing at which the "B(-)" voltage begins to be written to the first line. Therefore, the timing at which the blue light BL begins to illuminate the second line is later than the timing at which the blue light BL begins to illuminate the first line. The timing at which the "B(-)" voltage begins to be written to the third line is later than the timing at which the "B(-)" voltage begins to be written to the second line. Therefore, the timing at which the blue light BL begins to illuminate the third line is later than the timing at which the blue light BL begins to illuminate the second line. The same applies when the blue light BL is illuminated to lines 4 through 6.

[0086] As described above, in the comparative example, in order to suppress crosstalk in the projected image, the first color light L1 is emitted from the first light source device 20 only during the period when an even-numbered field, i.e., a negative polarity voltage, is written. In the comparative example, due to the integration effect (afterimage effect) of the eye, the first image light IL1 projected in the second field FD2 is perceived by humans as red image light. Also, the first image light IL1 projected in the fourth field FD4 is perceived by humans as green image light, and the first image light IL1 projected in the sixth field FD6 is perceived by humans as blue image light. As a result, the first image light IL1 projected in one frame is perceived by humans as full-color image light.

[0087] As explained above, in the comparative example, within one frame, i.e., within 60Hz, red light RL, green light GL, and blue light BL are each emitted once from the first light source device 20. If we define the frequency at which each color of light is emitted once from the first light source device 20 within one frame as the "color rotation frequency," then the color rotation frequency in the comparative example is 60Hz. According to the operation of the comparative example, within one frame, the colors of the first image light IL1 are perceived by a person in the order of red, green, and blue. Therefore, if the color rotation frequency is 60Hz, color breakup occurs.

[0088] For example, color breakup can be reduced by increasing the color rotation frequency. However, increasing the color rotation frequency also requires increasing the drive frequency of the first liquid crystal panel 60. For example, as explained in the comparative example, when the color rotation frequency is 60Hz, the drive frequency of the first liquid crystal panel 60 is 360Hz (the duration of one field is 2.78ms). Therefore, if the color rotation frequency is doubled, the drive frequency of the first liquid crystal panel 60 needs to be increased to 720Hz (the duration of one field is 1.38ms). Also, if the color rotation frequency is tripled, the drive frequency of the first liquid crystal panel 60 needs to be increased to 1080Hz (the duration of one field is 0.93ms).

[0089] Under the condition that the drive frequency of the first LCD panel 60 and the response speed of the liquid crystal are approximately equal, it is possible to achieve both color gamut and brightness. However, the response speed of a typical liquid crystal is quite slow, at about 3ms. Therefore, if the color rotation frequency is more than doubled, either the color gamut or brightness will be sacrificed. For these reasons, in the operation of the comparative example, it is difficult to achieve both color gamut and brightness while reducing color breakup.

[0090] The operation of the projector 201 in the first embodiment makes it possible to achieve both color gamut and brightness while reducing color breakup. The operation of the projector 201 in the first embodiment will be described below with reference to Figure 6.

[0091] Figure 6 is a timing chart showing the operation of the projector 201 in the first embodiment. Similar to Figure 5, in Figure 6, the period T1 from time t1 to time t7 corresponds to one frame. Similar to the comparative example, in the first embodiment, one frame is evenly divided into three subframes. One frame includes a first subframe SF1, a second subframe SF2, and a third subframe SF3. In Figure 6, the period from time t1 to time t3 corresponds to the first subframe SF1, the period from time t3 to time t5 corresponds to the second subframe SF2, and the period from time t5 to time t7 corresponds to the third subframe SF3.

[0092] Similar to the comparative example, in the first embodiment, each subframe is equally divided into two fields. The first subframe SF1 includes a first field FD1, which is the first half of the first subframe SF1 period, and a second field FD2, which is the second half of the first subframe SF1 period. The second subframe SF2 includes a third field FD3, which is the first half of the second subframe SF2 period, and a fourth field FD4, which is the second half of the second subframe SF2 period. The third subframe SF3 includes a fifth field FD5, which is the first half of the third subframe SF3 period, and a sixth field FD6, which is the second half of the third subframe SF3 period.

[0093] In Figure 6, the period from time t1 to time t2 corresponds to the first field FD1, and the period from time t2 to time t3 corresponds to the second field FD2. The period from time t3 to time t4 corresponds to the third field FD3, and the period from time t4 to time t5 corresponds to the fourth field FD4. The period from time t5 to time t6 corresponds to the fifth field FD5, and the period from time t6 to time t7 corresponds to the sixth field FD6.

[0094] Similar to the comparative example, in the first embodiment, the odd-numbered fields, including the first field FD1, the third field FD3, and the fifth field FD5, represent periods in the first liquid crystal panel 60 during which a positive voltage is written to each line sequentially from the first line to the last line. The even-numbered fields, including the second field FD2, the fourth field FD4, and the sixth field FD6, represent periods in the first liquid crystal panel 60 during which a negative voltage is written to each line sequentially from the first line to the last line.

[0095] For example, the frame rate in the first embodiment is 60 fps. That is, one frame corresponding to the period T1 from time t1 to time t7 is approximately 16.7 ms. In this case, the duration of one field is approximately 2.78 ms. In other words, in the first embodiment, the driving frequency of the first liquid crystal panel 60 is approximately 360 Hz.

[0096] Similar to the comparative example, in the first embodiment, for the sake of explanation, we assume that the first liquid crystal panel 60 has six lines. In Figure 6, "Line 1" represents the first line from the +Y side. "Line 2" represents the second line from the +Y side. "Line 3" represents the third line from the +Y side. "Line 4" represents the fourth line from the +Y side. "Line 5" represents the fifth line from the +Y side. "Line 6" represents the sixth line from the +Y side.

[0097] In the first embodiment, the first line is a line included in the first group. The second line is a line included in the second group. The third line is a line included in the third group. The fourth line is a line included in the fourth group. The fifth line is a line included in the fifth group. The sixth line is a line included in the sixth group. Thus, in the first embodiment, the multiple lines of the first liquid crystal panel 60 are divided into multiple groups, each containing one or more lines. As described above, in the first embodiment, as an example, the case in which each group contains one line is described, but each group may contain multiple lines. However, the number of lines included in each group must be the same.

[0098] For example, if each group contains two lines, then the first group contains the first and second lines, the second group contains the third and fourth lines, the third group contains the fifth and sixth lines, the fourth group contains the seventh and eighth lines, the fifth group contains the ninth and tenth lines, and the sixth group contains the eleventh and twelfth lines. Thus, the division of the multiple lines of the first liquid crystal panel 60 into multiple groups containing one or more lines is also the same in the second and third embodiments described below.

[0099] As shown in the upper timing chart of Figure 6, in the first embodiment, in each of the three subframes, voltages corresponding to one of the color data (red, green, or blue) are written to the pixels belonging to each line in order from the first line to the sixth line (the last line), and a voltage corresponding to a different color data is written for each line. If each group contains multiple lines, voltages corresponding to different color data are written for each of the multiple lines in each subframe.

[0100] In odd-numbered fields, a voltage corresponding to a different color data and having positive polarity is written to each line. In even-numbered fields, a voltage corresponding to a different color data and having negative polarity is written to each line. Positive polarity is an example of the first polarity. Negative polarity is an example of the second polarity, which is the opposite polarity of the first polarity. If each group contains multiple lines, in odd-numbered fields, a voltage corresponding to a different color data and having positive polarity is written to each of the multiple lines, and in even-numbered fields, a voltage corresponding to a different color data and having negative polarity is written to each of the multiple lines.

[0101] Specifically, in the first field FD1, a voltage corresponding to red data and having positive polarity ("R(+)") is written to the first line. In the first field FD1, a voltage corresponding to green data and having positive polarity ("G(+)") is written to the second line. In the first field FD1, a voltage corresponding to blue data and having positive polarity ("B(+)") is written to the third line.

[0102] In the first field FD1, a voltage corresponding to red data and having positive polarity ("R(+)") is written to the fourth line. In the first field FD1, a voltage corresponding to green data and having positive polarity ("G(+)") is written to the fifth line. In the first field FD1, a voltage corresponding to blue data and having positive polarity ("B(+)") is written to the sixth line.

[0103] In the second field FD2, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the first line. In the second field FD2, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the second line. In the second field FD2, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the third line.

[0104] In the second field FD2, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the fourth line. In the second field FD2, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the fifth line. In the second field FD2, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the sixth line.

[0105] In the third field FD3, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the first line. In the third field FD3, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the second line. In the third field FD3, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the third line.

[0106] In the third field FD3, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the fourth line. In the third field FD3, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the fifth line. In the third field FD3, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the sixth line.

[0107] In the fourth field FD4, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the first line. In the fourth field FD4, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the second line. In the fourth field FD4, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the third line.

[0108] In the fourth field FD4, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the fourth line. In the fourth field FD4, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the fifth line. In the fourth field FD4, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the sixth line.

[0109] In the fifth field FD5, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the first line. In the fifth field FD5, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the second line. In the fifth field FD5, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the third line.

[0110] In the fifth field FD5, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the fourth line. In the fifth field FD5, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the fifth line. In the fifth field FD5, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the sixth line.

[0111] In the sixth field FD6, a voltage corresponding to the blue data and having negative polarity ("B(-)") is written to the first line. In the sixth field FD6, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the second line. In the sixth field FD6, a voltage corresponding to the green data and having negative polarity ("G(-)") is written to the third line.

[0112] In the sixth field FD6, a voltage corresponding to the blue data and having negative polarity ("B(-)") is written to the fourth line. In the sixth field FD6, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the fifth line. In the sixth field FD6, a voltage corresponding to the green data and having negative polarity ("G(-)") is written to the sixth line.

[0113] As shown in the timing chart at the bottom of Figure 6, in the first embodiment, in each of the three subframes, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the sixth line. During the period in which the voltage corresponding to red data is written to the first liquid crystal panel 60, red light RL is emitted from the first light source device 20 as the first color light L1. During the period in which the voltage corresponding to green data is written to the first liquid crystal panel 60, green light GL is emitted from the first light source device 20 as the first color light L1. During the period in which the voltage corresponding to blue data is written to the first liquid crystal panel 60, blue light BL is emitted from the first light source device 20 as the first color light L1. In odd-numbered fields, the emission of the first color light L1 from the first light source device 20 is stopped. In even-numbered fields, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the sixth line.

[0114] Specifically, in the second field FD2, red light RL is shone on the first line during the period when the "R(-)" voltage is written to the first line, green light GL is shone on the second line during the period when the "G(-)" voltage is written to the second line, and blue light BL is shone on the third line during the period when the "B(-)" voltage is written to the third line.

[0115] In the second field FD2, red light RL is shone on the fourth line during the period when the "R(-)" voltage is written to the fourth line, green light GL is shone on the fifth line during the period when the "G(-)" voltage is written to the fifth line, and blue light BL is shone on the sixth line during the period when the "B(-)" voltage is written to the sixth line.

[0116] In the second field FD2, the timing at which the "G(-)" voltage begins to be written to the second line is later than the timing at which the "R(-)" voltage begins to be written to the first line. Therefore, the timing at which green light GL begins to illuminate the second line is later than the timing at which red light RL begins to illuminate the first line. The timing at which the "B(-)" voltage begins to be written to the third line is later than the timing at which the "G(-)" voltage begins to be written to the second line. Therefore, the timing at which blue light BL begins to illuminate the third line is later than the timing at which green light GL begins to illuminate the second line. The same applies when the first color light L1 is illuminated to lines 4 through 6 in the second field FD2.

[0117] In the fourth field FD4, green light GL is shone on the first line during the period when the "G(-)" voltage is written to the first line, blue light BL is shone on the second line during the period when the "B(-)" voltage is written to the second line, and red light RL is shone on the third line during the period when the "R(-)" voltage is written to the third line.

[0118] In the fourth field FD4, green light GL is shone on the fourth line during the period when the "G(-)" voltage is written to the fourth line, blue light BL is shone on the fifth line during the period when the "B(-)" voltage is written to the fifth line, and red light RL is shone on the sixth line during the period when the "R(-)" voltage is written to the sixth line.

[0119] In the fourth field FD4, the timing at which the "B(-)" voltage begins to be written to the second line is later than the timing at which the "G(-)" voltage begins to be written to the first line. Therefore, the timing at which blue light BL begins to irradiate the second line is later than the timing at which green light GL begins to irradiate the first line. The timing at which the "R(-)" voltage begins to be written to the third line is later than the timing at which the "B(-)" voltage begins to be written to the second line. Therefore, the timing at which red light RL begins to irradiate the third line is later than the timing at which blue light BL begins to irradiate the second line. The same applies in the fourth field FD4 when the first color light L1 is irradiated to lines 4 through 6.

[0120] In the sixth field FD6, blue light BL is shone on the first line during the period when the "B(-)" voltage is written to the first line, red light RL is shone on the second line during the period when the "R(-)" voltage is written to the second line, and green light GL is shone on the third line during the period when the "G(-)" voltage is written to the third line.

[0121] In the sixth field FD6, blue light BL is shone on the fourth line during the period when the "B(-)" voltage is written to the fourth line, red light RL is shone on the fifth line during the period when the "R(-)" voltage is written to the fifth line, and green light GL is shone on the sixth line during the period when the "G(-)" voltage is written to the sixth line.

[0122] In the sixth field FD6, the timing at which the "R(-)" voltage begins to be written to the second line is later than the timing at which the "B(-)" voltage begins to be written to the first line. Therefore, the timing at which red light RL begins to illuminate the second line is later than the timing at which blue light BL begins to illuminate the first line. The timing at which the "G(-)" voltage begins to be written to the third line is later than the timing at which the "R(-)" voltage begins to be written to the second line. Therefore, the timing at which green light GL begins to illuminate the third line is later than the timing at which red light RL begins to illuminate the second line. The same applies to the case in the sixth field FD6 where the first color light L1 is illuminated to lines 4 through 6.

[0123] According to the operation of the first embodiment described above, due to the integration effect of the eye, the first image light IL1 projected in the second field FD2 is perceived by a person as white image light. Similarly, the first image light IL1 projected in the fourth field FD4 is also perceived by a person as white image light, and the first image light IL1 projected in the sixth field FD6 is also perceived by a person as white image light. As a result, the first image light IL1 projected in one frame is perceived by a person as full-color image light.

[0124] As already explained, according to the operation of the comparative example, in one frame, the colors of the first image light IL1 are perceived by a person in the order of red, green, and blue, so color breakup occurs when the color rotation frequency is 60Hz. On the other hand, according to the operation of the first embodiment, in one frame, the colors of the first image light IL1 are perceived by a person in the order of white, white, and white, so color breakup can be reduced even when the color rotation frequency is 60Hz. In other words, according to the first embodiment, it is possible to achieve both color gamut and brightness while reducing color breakup.

[0125] As described above, the projector 201 of the first embodiment includes a first light source device 20 that emits one of red light RL, green light GL, and blue light BL as first color light L1; a first liquid crystal panel 60 having a plurality of lines arranged at predetermined intervals along the column direction and extending in the row direction, the lines being defined as arrays of pixels connected to a single scan line; and a first optical scanning device 40 that scans the first color light L1 incident on the first liquid crystal panel 60 along the column direction of the first liquid crystal panel 60. In each of the multiple subframes included in one frame, in the first liquid crystal panel 60, voltages corresponding to one of the color data (red data, green data, or blue data) are written to the pixels belonging to each line in order from the first line to the last line, and voltages corresponding to different color data are written for each line (each line in this embodiment). The first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the last line, and during the period in which the voltage corresponding to the red data is written to the first liquid crystal panel 60, red light RL is emitted from the first light source device 20 as the first color light L1, during the period in which the voltage corresponding to the green data is written to the first liquid crystal panel 60, green light GL is emitted from the first light source device 20 as the first color light L1, and during the period in which the voltage corresponding to the blue data is written to the first liquid crystal panel 60, blue light BL is emitted from the first light source device 20 as the first color light L1.

[0126] According to the first embodiment described above, in each subframe included in one frame, the color of the first image light IL1 is perceived as white by humans, so color breakup can be reduced even when the color rotation frequency is 60 Hz. In other words, according to the first embodiment, it is possible to achieve both color gamut and brightness while reducing color breakup.

[0127] In the first embodiment, one frame includes a first subframe SF1, a second subframe SF2, and a third subframe SF3. In the first subframe SF1, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60; a voltage corresponding to the second color data (green data in this embodiment) different from the first color data is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60; and a voltage corresponding to the third color data (blue data in this embodiment) different from the first color data and the second color data is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. In the second subframe SF2, a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60; a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60; and a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. In the third subframe SF3, a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60, and a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. The first color data, second color data, and third color data are each one of red data, green data, and blue data.

[0128] According to the first embodiment described above, in a single frame containing three subframes, the color of the first image light IL1 is perceived by humans in the order of white, white, and white. Therefore, even when the color rotation frequency is 60 Hz, it is possible to achieve both color gamut and brightness while reducing color breakup.

[0129] In the first embodiment, each of the multiple subframes includes an odd-numbered field, which is the first half of the period, and an even-numbered field, which is the second half of the period. In the odd-numbered field, a voltage corresponding to different color data for each line of the first liquid crystal panel 60 and having a first polarity (positive polarity in this embodiment) is written, and the emission of first color light L1 from the first light source device 20 is stopped. In the even-numbered field, a voltage corresponding to different color data for each line of the first liquid crystal panel 60 and having a second polarity (negative polarity in this embodiment), which is the opposite polarity of the first polarity, is written, and the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the last line.

[0130] According to the first embodiment described above, the first color light L1 is emitted from the first light source device 20 only during the period when even-numbered fields, i.e., voltages of the second polarity, are written to each subframe, thus suppressing crosstalk in the projected image.

[0131] In the first embodiment described above, in the first subframe SF1, voltages are written in the order of red data, green data, and blue data from the first to the third line, and in the same order from the fourth to the sixth line. In the second subframe SF2, voltages are written in the order of green data, blue data, and red data from the first to the third line, and in the same order from the fourth to the sixth line. In the third subframe SF3, voltages are written in the order of blue data, red data, and green data from the first to the third line, and in the same order from the fourth to the sixth line. However, the order in which the voltages are written is not limited to the above order. For example, as shown in Figure 7, the order in which the voltages are written from the first to the third line may be different from the order in which the voltages are written from the fourth to the sixth line.

[0132] Figure 7 is a timing chart showing a modified operation of the projector 201 of the first embodiment. As shown in Figure 7, in the first subframe SF1, voltages may be written in the order of red data, green data, and blue data from the first to the third line, and in the order of green data, blue data, and red data from the fourth to the sixth line. In the second subframe SF2, voltages may be written in the order of green data, blue data, and red data from the first to the third line, and in the order of blue data, red data, and green data from the fourth to the sixth line. In the third subframe SF3, voltages may be written in the order of blue data, red data, and green data from the first to the third line, and in the order of red data, green data, and blue data from the fourth to the sixth line.

[0133] In the modified example shown in Figure 7, due to the integration effect of the eye, the first image light IL1 projected in the second field FD2 is perceived by humans as white image light. Similarly, the first image light IL1 projected in the fourth field FD4 is also perceived by humans as white image light, and the first image light IL1 projected in the sixth field FD6 is also perceived by humans as white image light. As a result, the first image light IL1 projected in one frame is perceived by humans as full-color image light.

[0134] [Second Embodiment] Next, a second embodiment of this disclosure will be described. In the description of the second embodiment, explanations of content common to the first embodiment will be omitted, and only content that differs from the first embodiment will be described. Also, the configuration of the projector in the second embodiment is the same as the configuration of projector 201 in the first embodiment. Therefore, in the following description, the projector in the second embodiment will also be referred to as projector 201.

[0135] The operation of the projector 201 of the second embodiment will be described below with reference to Figure 8. Figure 8 is a timing chart showing the operation of the projector 201 of the second embodiment.

[0136] In Figure 8, the period T2 from time t1 to time t9 corresponds to one frame. In the second embodiment, one frame is evenly divided into four subframes. One frame includes a first subframe SF1, a second subframe SF2, a third subframe SF3, and a fourth subframe SF4. In Figure 7, the period from time t1 to time t3 corresponds to the first subframe SF1, the period from time t3 to time t5 corresponds to the second subframe SF2, the period from time t5 to time t7 corresponds to the third subframe SF3, and the period from time t7 to time t9 corresponds to the fourth subframe SF4.

[0137] Similar to the first embodiment, in the second embodiment, each subframe is equally divided into two fields. The first subframe SF1 includes a first field FD1, which is the first half of the first subframe SF1 period, and a second field FD2, which is the second half of the first subframe SF1 period. The second subframe SF2 includes a third field FD3, which is the first half of the second subframe SF2 period, and a fourth field FD4, which is the second half of the second subframe SF2 period. The third subframe SF3 includes a fifth field FD5, which is the first half of the third subframe SF3 period, and a sixth field FD6, which is the second half of the third subframe SF3 period. The fourth subframe SF4 includes a seventh field FD7, which is the first half of the fourth subframe SF4 period, and an eighth field FD8, which is the second half of the fourth subframe SF4 period.

[0138] In Figure 8, the period from time t1 to time t2 corresponds to the first field FD1, and the period from time t2 to time t3 corresponds to the second field FD2. The period from time t3 to time t4 corresponds to the third field FD3, and the period from time t4 to time t5 corresponds to the fourth field FD4. The period from time t5 to time t6 corresponds to the fifth field FD5, and the period from time t6 to time t7 corresponds to the sixth field FD6. The period from time t7 to time t8 corresponds to the seventh field FD7, and the period from time t8 to time t9 corresponds to the eighth field FD8.

[0139] Similar to the first embodiment, in the second embodiment, the odd fields, including the first field FD1, the third field FD3, the fifth field FD5, and the seventh field FD7, represent periods in the first liquid crystal panel 60 during which a positive voltage is written to each line sequentially from the first line to the last line. The even fields, including the second field FD2, the fourth field FD4, the sixth field FD6, and the eighth field FD8, represent periods in the first liquid crystal panel 60 during which a negative voltage is written to each line sequentially from the first line to the last line.

[0140] For example, the frame rate in the second embodiment is 60 fps. That is, one frame corresponding to the period T2 from time t1 to time t9 is approximately 16.7 ms. In this case, the duration of one field is approximately 2.09 ms. In other words, in the second embodiment, the driving frequency of the first liquid crystal panel 60 is approximately 480 Hz.

[0141] Similar to the first embodiment, in the second embodiment, for the sake of explanation, we assume that the first liquid crystal panel 60 has six lines. In Figure 8, "Line 1" represents the first line from the +Y side. "Line 2" represents the second line from the +Y side. "Line 3" represents the third line from the +Y side. "Line 4" represents the fourth line from the +Y side. "Line 5" represents the fifth line from the +Y side. "Line 6" represents the sixth line from the +Y side.

[0142] As shown in the upper timing chart of Figure 8, in the first field FD1, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the first line. In the first field FD1, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the second line. In the first field FD1, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the third line.

[0143] In the first field FD1, a voltage corresponding to red data and having positive polarity ("R(+)") is written to the fourth line. In the first field FD1, a voltage corresponding to green data and having positive polarity ("G(+)") is written to the fifth line. In the first field FD1, a voltage corresponding to blue data and having positive polarity ("B(+)") is written to the sixth line.

[0144] In the second field FD2, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the first line. In the second field FD2, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the second line. In the second field FD2, a voltage corresponding to blue image data and having negative polarity ("B(-)") is written to the third line.

[0145] In the second field FD2, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the fourth line. In the second field FD2, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the fifth line. In the second field FD2, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the sixth line.

[0146] In the third field FD3, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the first line. In the third field FD3, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the second line. In the third field FD3, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the third line.

[0147] In the third field FD3, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the fourth line. In the third field FD3, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the fifth line. In the third field FD3, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the sixth line.

[0148] In the fourth field FD4, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the first line. In the fourth field FD4, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the second line. In the fourth field FD4, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the third line.

[0149] In the fourth field FD4, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the fourth line. In the fourth field FD4, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the fifth line. In the fourth field FD4, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the sixth line.

[0150] In the fifth field FD5, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the first line. In the fifth field FD5, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the second line. In the fifth field FD5, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the third line.

[0151] In the fifth field FD5, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the fourth line. In the fifth field FD5, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the fifth line. In the fifth field FD5, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the sixth line.

[0152] In the sixth field FD6, a voltage corresponding to the blue data and having negative polarity ("B(-)") is written to the first line. In the sixth field FD6, a voltage corresponding to the green data and having negative polarity ("G(-)") is written to the second line. In the sixth field FD6, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the third line.

[0153] In the sixth field FD6, a voltage corresponding to the blue data and having negative polarity ("B(-)") is written to the fourth line. In the sixth field FD6, a voltage corresponding to the green data and having negative polarity ("G(-)") is written to the fifth line. In the sixth field FD6, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the sixth line.

[0154] In the 7th field FD7, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the first line. In the 7th field FD7, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the second line. In the 7th field FD7, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the third line.

[0155] In the 7th field FD7, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the 4th line. In the 7th field FD7, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the 5th line. In the 7th field FD7, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the 6th line.

[0156] In the 8th field FD8, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the first line. In the 8th field FD8, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the second line. In the 8th field FD8, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the third line.

[0157] In the 8th field FD8, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the 4th line. In the 8th field FD8, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the 5th line. In the 8th field FD8, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the 6th line.

[0158] As shown in the timing chart at the bottom of Figure 8, in the second embodiment, in each of the four subframes, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the sixth line. Similar to the first embodiment, in the second embodiment as well, in odd-numbered fields, the emission of the first color light L1 from the first light source device 20 is stopped. In even-numbered fields, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the sixth line.

[0159] Specifically, in the second field FD2, red light RL is shone on the first line during the period when the "R(-)" voltage is written to the first line, green light GL is shone on the second line during the period when the "G(-)" voltage is written to the second line, and blue light BL is shone on the third line during the period when the "B(-)" voltage is written to the third line.

[0160] In the second field FD2, red light RL is shone on the fourth line during the period when the "R(-)" voltage is written to the fourth line, green light GL is shone on the fifth line during the period when the "G(-)" voltage is written to the fifth line, and blue light BL is shone on the sixth line during the period when the "B(-)" voltage is written to the sixth line.

[0161] In the second field FD2, the timing at which the "G(-)" voltage begins to be written to the second line is later than the timing at which the "R(-)" voltage begins to be written to the first line. Therefore, the timing at which green light GL begins to illuminate the second line is later than the timing at which red light RL begins to illuminate the first line. The timing at which the "B(-)" voltage begins to be written to the third line is later than the timing at which the "G(-)" voltage begins to be written to the second line. Therefore, the timing at which blue light BL begins to illuminate the third line is later than the timing at which green light GL begins to illuminate the second line. The same applies when the first color light L1 is illuminated to lines 4 through 6 in the second field FD2.

[0162] In the fourth field FD4, the first line is illuminated with green light GL during the period when the "G(-)" voltage is written to the first line, the second line is illuminated with blue light BL during the period when the "B(-)" voltage is written to the second line, and the third line is illuminated with green light GL during the period when the "G(-)" voltage is written to the third line.

[0163] In the fourth field FD4, green light GL is shone on the fourth line during the period when the "G(-)" voltage is written to the fourth line, blue light BL is shone on the fifth line during the period when the "B(-)" voltage is written to the fifth line, and green light GL is shone on the sixth line during the period when the "G(-)" voltage is written to the sixth line.

[0164] In the fourth field FD4, the timing at which the "B(-)" voltage begins to be written to the second line is later than the timing at which the "G(-)" voltage begins to be written to the first line. Therefore, the timing at which blue light BL begins to irradiate the second line is later than the timing at which green light GL begins to irradiate the first line. The timing at which the "G(-)" voltage begins to be written to the third line is later than the timing at which the "B(-)" voltage begins to be written to the second line. Therefore, the timing at which green light GL begins to irradiate the third line is later than the timing at which blue light BL begins to irradiate the second line. The same applies in the fourth field FD4 when the first color light L1 is irradiated to lines 4 through 6.

[0165] In the sixth field FD6, blue light BL is shone on the first line during the period when the "B(-)" voltage is written to the first line, green light GL is shone on the second line during the period when the "G(-)" voltage is written to the second line, and red light RL is shone on the third line during the period when the "R(-)" voltage is written to the third line.

[0166] In the sixth field FD6, blue light BL is shone on the fourth line during the period when the "B(-)" voltage is written to the fourth line, green light GL is shone on the fifth line during the period when the "G(-)" voltage is written to the fifth line, and red light RL is shone on the sixth line during the period when the "R(-)" voltage is written to the sixth line.

[0167] In the sixth field FD6, the timing at which the "G(-)" voltage begins to be written to the second line is later than the timing at which the "B(-)" voltage begins to be written to the first line. Therefore, the timing at which green light GL begins to illuminate the second line is later than the timing at which blue light BL begins to illuminate the first line. The timing at which the "R(-)" voltage begins to be written to the third line is later than the timing at which the "G(-)" voltage begins to be written to the second line. Therefore, the timing at which red light RL begins to illuminate the third line is later than the timing at which green light GL begins to illuminate the second line. The same applies in the sixth field FD6 when the first color light L1 is illuminated to lines 4 through 6.

[0168] In the 8th field FD8, the first line is illuminated with green light GL during the period when the "G(-)" voltage is written to the first line, the second line is illuminated with red light RL during the period when the "R(-)" voltage is written to the second line, and the third line is illuminated with green light GL during the period when the "G(-)" voltage is written to the third line.

[0169] In the 8th field FD8, the 4th line is illuminated with green light GL during the period when the "G(-)" voltage is written to the 4th line, the 5th line is illuminated with red light RL during the period when the "R(-)" voltage is written to the 5th line, and the 6th line is illuminated with green light GL during the period when the "G(-)" voltage is written to the 6th line.

[0170] In the 8th field FD8, the timing at which the "R(-)" voltage begins to be written to the second line is later than the timing at which the "G(-)" voltage begins to be written to the first line. Therefore, the timing at which red light RL begins to illuminate the second line is later than the timing at which green light GL begins to illuminate the first line. The timing at which the "G(-)" voltage begins to be written to the third line is later than the timing at which the "R(-)" voltage begins to be written to the second line. Therefore, the timing at which green light GL begins to illuminate the third line is later than the timing at which red light RL begins to illuminate the second line. The same applies to the case in the 8th field FD8 where the first color light L1 is illuminated to lines 4 through 6.

[0171] According to the operation of the second embodiment described above, due to the integration effect of the eye, the first image light IL1 projected in the second field FD2 is perceived by a person as white image light. Also, the first image light IL1 projected in the fourth field FD4 is perceived by a person as cyan image light. The first image light IL1 projected in the sixth field FD6 is perceived by a person as white image light. The first image light IL1 projected in the eighth field FD8 is perceived by a person as yellow image light. As a result, the first image light IL1 projected in one frame is perceived by a person as full-color image light.

[0172] According to the operation of the second embodiment, in one frame, the colors of the first image light IL1 are perceived by a person in the order of white, cyan (complementary color), white, and yellow (complementary color). Thus, in the second embodiment, complementary colors are mixed among the colors perceived by a person within one frame, so the effect of reducing color breakup is lower than in the first embodiment. However, compared to the first embodiment, the green emission period within one frame is longer in the second embodiment, so the brightness of the image perceived by a person can be improved.

[0173] As described above, in the second embodiment, one frame includes a first subframe SF1, a second subframe SF2, a third subframe SF3, and a fourth subframe SF4. In the first subframe SF1, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60; a voltage corresponding to the second color data (green data in this embodiment), which is different from the first color data, is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60; and a voltage corresponding to the third color data (blue data in this embodiment), which is different from the first and second color data, is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. In the second subframe SF2, a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60, a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60, and a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. In the third subframe SF3, a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60; a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60; and a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. In the fourth subframe SF4, a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60, and a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. The first color data, second color data, and third color data are each either red data, green data, or blue data. In each subframe, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the last line, and red light RL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to red data is written to the first liquid crystal panel 60, green light GL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to green data is written to the first liquid crystal panel 60, and blue light BL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to blue data is written to the first liquid crystal panel 60.

[0174] According to the second embodiment described above, in one frame, the colors of the first image light IL1 are perceived by humans in the order of white, cyan (complementary color), white, and yellow (complementary color). Thus, in the second embodiment, complementary colors are mixed among the colors perceived by humans within one frame, so the effect of reducing color breakup is lower than in the first embodiment. However, compared to the first embodiment, the second embodiment has a longer green emission period within one frame, so the brightness of the image perceived by humans can be improved.

[0175] As explained in the modified example of the first embodiment, in the second embodiment as well, the order in which voltages are written from the first line to the sixth line is not limited to the order shown in Figure 8.

[0176] [Third Embodiment] Next, a third embodiment of this disclosure will be described. In the description of the third embodiment, explanations of content common to the second embodiment will be omitted, and only content that differs from the second embodiment will be described. Also, the configuration of the projector in the third embodiment is the same as the configuration of projector 201 in the first embodiment. Therefore, in the following description, the projector in the third embodiment will also be referred to as projector 201.

[0177] The operation of the projector 201 of the third embodiment will be described below with reference to Figure 9. Figure 9 is a timing chart showing the operation of the projector 201 of the third embodiment.

[0178] In Figure 9, the period T2 from time t1 to time t9 corresponds to one frame. Similar to the second embodiment, in the third embodiment as well, one frame is equally divided into four subframes. One frame includes a first subframe SF1, a second subframe SF2, a third subframe SF3, and a fourth subframe SF4.

[0179] Similar to the second embodiment, in the third embodiment, each subframe is equally divided into two fields. The first subframe SF1 includes the first field FD1 and the second field FD2. The second subframe SF2 includes the third field FD3 and the fourth field FD4. The third subframe SF3 includes the fifth field FD5 and the sixth field FD6. The fourth subframe SF4 includes the seventh field FD7 and the eighth field FD8.

[0180] Similar to the second embodiment, in the third embodiment, the odd fields, including the first field FD1, the third field FD3, the fifth field FD5, and the seventh field FD7, represent periods in the first liquid crystal panel 60 during which a positive voltage is written to each line sequentially from the first line to the last line. The even fields, including the second field FD2, the fourth field FD4, the sixth field FD6, and the eighth field FD8, represent periods in the first liquid crystal panel 60 during which a negative voltage is written to each line sequentially from the first line to the last line.

[0181] For example, the frame rate in the third embodiment is 60 fps. That is, one frame corresponding to the period T2 from time t1 to time t9 is approximately 16.7 ms. In this case, the duration of one field is approximately 2.09 ms. In other words, in the third embodiment, the driving frequency of the first liquid crystal panel 60 is approximately 480 Hz.

[0182] Similar to the second embodiment, the third embodiment assumes, for the sake of explanation, that the first liquid crystal panel 60 has six lines. In Figure 9, "Line 1" represents the first line from the +Y side. "Line 2" represents the second line from the +Y side. "Line 3" represents the third line from the +Y side. "Line 4" represents the fourth line from the +Y side. "Line 5" represents the fifth line from the +Y side. "Line 6" represents the sixth line from the +Y side.

[0183] As shown in the upper timing chart of Figure 9, in the first field FD1, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the first line. In the first field FD1, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the second line. In the first field FD1, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the third line.

[0184] In the first field FD1, a voltage corresponding to red data and having positive polarity ("R(+)") is written to the fourth line. In the first field FD1, a voltage corresponding to green data and having positive polarity ("G(+)") is written to the fifth line. In the first field FD1, a voltage corresponding to blue data and having positive polarity ("B(+)") is written to the sixth line.

[0185] In the second field FD2, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the first line. In the second field FD2, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the second line. In the second field FD2, a voltage corresponding to blue image data and having negative polarity ("B(-)") is written to the third line.

[0186] In the second field FD2, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the fourth line. In the second field FD2, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the fifth line. In the second field FD2, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the sixth line.

[0187] In the third field FD3, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the first line. In the third field FD3, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the second line. In the third field FD3, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the third line.

[0188] In the third field FD3, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the fourth line. In the third field FD3, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the fifth line. In the third field FD3, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the sixth line.

[0189] In the fourth field FD4, a voltage corresponding to the green data and having negative polarity ("G(-)") is written to the first line. In the fourth field FD4, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the second line. In the fourth field FD4, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the third line.

[0190] In the fourth field FD4, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the fourth line. In the fourth field FD4, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the fifth line. In the fourth field FD4, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the sixth line.

[0191] In the fifth field FD5, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the first line. In the fifth field FD5, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the second line. In the fifth field FD5, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the third line.

[0192] In the fifth field FD5, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the fourth line. In the fifth field FD5, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the fifth line. In the fifth field FD5, a voltage corresponding to the green data and having positive polarity ("G(+)") is written to the sixth line.

[0193] In the sixth field FD6, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the first line. In the sixth field FD6, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the second line. In the sixth field FD6, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the third line.

[0194] In the sixth field FD6, a voltage corresponding to red data and having negative polarity ("R(-)") is written to the fourth line. In the sixth field FD6, a voltage corresponding to blue data and having negative polarity ("B(-)") is written to the fifth line. In the sixth field FD6, a voltage corresponding to green data and having negative polarity ("G(-)") is written to the sixth line.

[0195] In the 7th field FD7, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the first line. In the 7th field FD7, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the second line. In the 7th field FD7, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the third line.

[0196] In the 7th field FD7, a voltage corresponding to the blue data and having positive polarity ("B(+)") is written to the 4th line. In the 7th field FD7, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the 5th line. In the 7th field FD7, a voltage corresponding to the red data and having positive polarity ("R(+)") is written to the 6th line.

[0197] In the 8th field FD8, a voltage corresponding to the blue data and having negative polarity ("B(-)") is written to the first line. In the 8th field FD8, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the second line. In the 8th field FD8, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the third line.

[0198] In the 8th field FD8, a voltage corresponding to the blue data and having negative polarity ("B(-)") is written to the 4th line. In the 8th field FD8, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the 5th line. In the 8th field FD8, a voltage corresponding to the red data and having negative polarity ("R(-)") is written to the 6th line.

[0199] As shown in the timing chart at the bottom of Figure 9, in the third embodiment, in each of the four subframes, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the sixth line. Similar to the second embodiment, in the third embodiment as well, in odd-numbered fields, the emission of the first color light L1 from the first light source device 20 is stopped. In even-numbered fields, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the sixth line.

[0200] Specifically, in the second field FD2, red light RL is shone on the first line during the period when the "R(-)" voltage is written to the first line, green light GL is shone on the second line during the period when the "G(-)" voltage is written to the second line, and blue light BL is shone on the third line during the period when the "B(-)" voltage is written to the third line.

[0201] In the second field FD2, red light RL is shone on the fourth line during the period when the "R(-)" voltage is written to the fourth line, green light GL is shone on the fifth line during the period when the "G(-)" voltage is written to the fifth line, and blue light BL is shone on the sixth line during the period when the "B(-)" voltage is written to the sixth line.

[0202] In the second field FD2, the timing at which the "G(-)" voltage begins to be written to the second line is later than the timing at which the "R(-)" voltage begins to be written to the first line. Therefore, the timing at which green light GL begins to illuminate the second line is later than the timing at which red light RL begins to illuminate the first line. The timing at which the "B(-)" voltage begins to be written to the third line is later than the timing at which the "G(-)" voltage begins to be written to the second line. Therefore, the timing at which blue light BL begins to illuminate the third line is later than the timing at which green light GL begins to illuminate the second line. The same applies when the first color light L1 is illuminated to lines 4 through 6 in the second field FD2.

[0203] In the fourth field FD4, the first line is illuminated with green light GL during the period when the "G(-)" voltage is written to the first line, the second line is illuminated with red light RL during the period when the "R(-)" voltage is written to the second line, and the third line is illuminated with red light RL during the period when the "R(-)" voltage is written to the third line.

[0204] In the fourth field FD4, green light GL is shone on the fourth line during the period when the "G(-)" voltage is written to the fourth line, red light RL is shone on the fifth line during the period when the "R(-)" voltage is written to the fifth line, and red light RL is shone on the sixth line during the period when the "R(-)" voltage is written to the sixth line.

[0205] In the fourth field FD4, the timing at which the "R(-)" voltage begins to be written to the second line is later than the timing at which the "G(-)" voltage begins to be written to the first line. Therefore, the timing at which red light RL begins to illuminate the second line is later than the timing at which green light GL begins to illuminate the first line. The timing at which the "R(-)" voltage begins to be written to the third line is later than the timing at which the "R(-)" voltage begins to be written to the second line. Therefore, the timing at which red light RL begins to illuminate the third line is later than the timing at which red light RL begins to illuminate the second line. The same applies in the fourth field FD4 when the first color light L1 is illuminated to lines 4 through 6.

[0206] In the sixth field FD6, red light RL is shone on the first line during the period when the voltage "R(-)" is written to the first line, blue light BL is shone on the second line during the period when the voltage "B(-)" is written to the second line, and green light GL is shone on the third line during the period when the voltage "G(-)" is written to the third line.

[0207] In the sixth field FD6, red light RL is shone on the fourth line during the period when the "R(-)" voltage is written to the fourth line, blue light BL is shone on the fifth line during the period when the "B(-)" voltage is written to the fifth line, and green light GL is shone on the sixth line during the period when the "G(-)" voltage is written to the sixth line.

[0208] In the sixth field FD6, the timing at which the "B(-)" voltage begins to be written to the second line is later than the timing at which the "R(-)" voltage begins to be written to the first line. Therefore, the timing at which blue light BL begins to irradiate the second line is later than the timing at which red light RL begins to irradiate the first line. The timing at which the "G(-)" voltage begins to be written to the third line is later than the timing at which the "B(-)" voltage begins to be written to the second line. Therefore, the timing at which green light GL begins to irradiate the third line is later than the timing at which blue light BL begins to irradiate the second line. The same applies in the sixth field FD6 when the first color light L1 is irradiated to lines 4 through 6.

[0209] In the 8th field FD8, blue light BL is shone on the first line during the period when the "B(-)" voltage is written to the first line, red light RL is shone on the second line during the period when the "R(-)" voltage is written to the second line, and red light RL is shone on the third line during the period when the "R(-)" voltage is written to the third line.

[0210] In the 8th field FD8, blue light BL is shone on the 4th line during the period when the "B(-)" voltage is written to the 4th line, red light RL is shone on the 5th line during the period when the "R(-)" voltage is written to the 5th line, and red light RL is shone on the 6th line during the period when the "R(-)" voltage is written to the 6th line.

[0211] In the 8th field FD8, the timing at which the "R(-)" voltage begins to be written to the second line is later than the timing at which the "B(-)" voltage begins to be written to the first line. Therefore, the timing at which red light RL begins to illuminate the second line is later than the timing at which blue light BL begins to illuminate the first line. The timing at which the "R(-)" voltage begins to be written to the third line is later than the timing at which the "R(-)" voltage begins to be written to the second line. Therefore, the timing at which red light RL begins to illuminate the third line is later than the timing at which red light RL begins to illuminate the second line. The same applies to the case where the first color light L1 is illuminated to lines 4 through 6 in the 8th field FD8.

[0212] According to the operation of the third embodiment described above, due to the integration effect of the eye, the first image light IL1 projected in the second field FD2 is perceived by a person as white image light. Also, the first image light IL1 projected in the fourth field FD4 is perceived by a person as yellow image light. The first image light IL1 projected in the sixth field FD6 is perceived by a person as white image light. The first image light IL1 projected in the eighth field FD8 is perceived by a person as magenta image light. As a result, the first image light IL1 projected in one frame is perceived by a person as full-color image light.

[0213] According to the operation of the third embodiment, in one frame, the colors of the first image light IL1 are perceived by a person in the order of white, yellow (complementary color), white, and magenta (complementary color). Thus, in the third embodiment, complementary colors are mixed among the colors perceived by a person within one frame, so the effect of reducing color breakup is lower than in the first embodiment. However, compared to the first embodiment, the red emission period within one frame is longer in the third embodiment, so the white balance of the image perceived by a person can be improved.

[0214] As described above, in the third embodiment, one frame includes a first subframe SF1, a second subframe SF2, a third subframe SF3, and a fourth subframe SF4. In the first subframe SF1, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60; a voltage corresponding to the second color data (green data in this embodiment), which is different from the first color data, is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60; and a voltage corresponding to the third color data (blue data in this embodiment), which is different from the first and second color data, is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. In the second subframe SF2, a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60, and a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. In the third subframe SF3, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60; a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60; and a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. In the fourth subframe SF4, a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60, and a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60. The first color data, second color data, and third color data are each either red data, green data, or blue data. In each subframe, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the last line, and red light RL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to red data is written to the first liquid crystal panel 60, green light GL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to green data is written to the first liquid crystal panel 60, and blue light BL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to blue data is written to the first liquid crystal panel 60.

[0215] According to the third embodiment described above, in one frame, the colors of the first image light IL1 are perceived by humans in the order of white, yellow (complementary color), white, and magenta (complementary color). Thus, in the third embodiment, complementary colors are mixed in among the colors perceived by humans within one frame, so the effect of reducing color breakup is lower than in the first embodiment. However, compared to the first embodiment, the red emission period within one frame is longer in the third embodiment, so the white balance of the image perceived by humans can be improved.

[0216] As explained in the modified example of the first embodiment, in the third embodiment as well, the order in which voltages are written from the first line to the sixth line is not limited to the order shown in Figure 9.

[0217] [Fourth Embodiment] Next, a fourth embodiment of this disclosure will be described. In the description of the fourth embodiment, explanations of content common to the first embodiment will be omitted, and only content that differs from the first embodiment will be described. Furthermore, regarding the configuration of the projector 202 of the fourth embodiment, components common to the projector 201 of the first embodiment will be denoted by the same reference numerals as the corresponding components of the projector 201 of the first embodiment, and their explanations will be omitted.

[0218] Figure 10 is a schematic diagram of a projector 202 according to the fourth embodiment. The projector 202 is a two-panel image display device equipped with two liquid crystal panels as a liquid crystal panel. As shown in Figure 10, the projector 202 comprises a first light source device 20, a first optical scanning device 40, a first liquid crystal panel 60, a P-polarization optical system 71, a first incident polarizer 72, a first exit polarizer 73, a second light source device 20A, a second optical scanning device 40A, a second liquid crystal panel 60A, an S-polarization optical system 74, a second incident polarizer 75, a second exit polarizer 76, a photosynthesis element 77, a projection optical system 80, and a control device 100.

[0219] The first light source device 20 emits one of the following as the first color light L1: red light RL, green light GL, and blue light BL. The first optical scanning device 40 scans the first color light L1 incident on the first liquid crystal panel 60 along the column direction of the first liquid crystal panel 60.

[0220] The P-polarization optical system 71 is positioned between the first optical scanning device 40 and the first liquid crystal panel 60, and converts the first color light L1 incident on the first liquid crystal panel 60 into P-polarized light. The first incident polarizer 72 is positioned on the incident side of the first liquid crystal panel 60, and the first exit polarizer 73 is positioned on the exit side of the first liquid crystal panel 60. The first color light L1, converted to P-polarization, is incident on the first liquid crystal panel 60 via the first incident polarizer 72. The first image light IL1, generated by the modulation of the first color light L1 by the first liquid crystal panel 60, is emitted to the photosynthesis element 77 via the first exit polarizer 73.

[0221] The second light source device 20A emits one of the following as the second color light L2: red light RL, green light GL, and blue light BL. The configuration of the second light source device 20A is the same as that of the first light source device 20. The second optical scanning device 40A scans the second color light L2 incident on the second liquid crystal panel 60A along the column direction of the second liquid crystal panel 60A. The configuration of the second optical scanning device 40A is the same as that of the first optical scanning device 40. The second liquid crystal panel 60A is a liquid crystal panel having the same configuration as the first liquid crystal panel 60. Therefore, the second liquid crystal panel 60A has multiple lines arranged at predetermined intervals along the column direction and extending in the row direction.

[0222] The S-polarization optical system 74 is positioned between the second optical scanning device 40A and the second liquid crystal panel 60A, and converts the second color light L2 incident on the second liquid crystal panel 60A into S-polarized light. The second incident polarizer 75 is positioned on the incident side of the second liquid crystal panel 60A, and the second exit polarizer 76 is positioned on the exit side of the second liquid crystal panel 60A. The second color light L2, converted to S-polarized light, is incident on the second liquid crystal panel 60A via the second incident polarizer 75. The second image light IL2, generated by the modulation of the second color light L2 by the second liquid crystal panel 60A, is emitted to the photosynthesis element 77 via the second exit polarizer 76.

[0223] The photosynthetic element 77 generates a composite image light CL by combining the first image light IL1, which is generated when the first color light L1 is modulated by the first liquid crystal panel 60, and the second image light IL2, which is generated when the second color light L2 is modulated by the second liquid crystal panel 60A. The photosynthetic element 77 emits the composite image light CL to the projection optical system 80. For example, the photosynthetic element 77 is a dichroic prism. The projection optical system 80 magnifies and projects the composite image light CL generated by the photosynthetic element 77 toward a projection surface such as a screen.

[0224] The control device 100 controls the first light source device 20, the first optical scanning device 40, the first liquid crystal panel 60, the second light source device 20A, the second optical scanning device 40A, and the second liquid crystal panel 60A.

[0225] For example, the control device 100 controls the first light source device 20, the first optical scanning device 40, and the first liquid crystal panel 60 to operate according to the timing chart shown in Figure 8, which was described in the second embodiment, and controls the second light source device 20A, the second optical scanning device 40A, and the second liquid crystal panel 60A to operate according to the timing chart shown in Figure 9, which was described in the third embodiment.

[0226] In other words, the first light source device 20, the first optical scanning device 40, and the first liquid crystal panel 60 are controlled to operate as follows, according to the timing chart in Figure 8 described in the second embodiment.

[0227] In the first subframe SF1, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60; a voltage corresponding to the second color data (green data in this embodiment), which is different from the first color data, is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60; and a voltage corresponding to the third color data (blue data in this embodiment), which is different from the first and second color data, is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60.

[0228] In the second subframe SF2, a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60, a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60, and a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60.

[0229] In the third subframe SF3, a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60; a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60; and a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60.

[0230] In the fourth subframe SF4, a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the first liquid crystal panel 60, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the first liquid crystal panel 60, and a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the first liquid crystal panel 60.

[0231] In each subframe, the first color light L1 incident on the first liquid crystal panel 60 is scanned from the first line to the last line, and red light RL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to red data is written to the first liquid crystal panel 60, green light GL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to green data is written to the first liquid crystal panel 60, and blue light BL is emitted from the first light source device 20 as the first color light L1 during the period when the voltage corresponding to blue data is written to the first liquid crystal panel 60.

[0232] Furthermore, the second light source device 20A, the second optical scanning device 40A, and the second liquid crystal panel 60A are controlled to operate as follows, according to the timing chart in Figure 9 described in the third embodiment.

[0233] In the first subframe SF1, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the second liquid crystal panel 60A; a voltage corresponding to the second color data (green data in this embodiment), which is different from the first color data, is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the second liquid crystal panel 60A; and a voltage corresponding to the third color data (blue data in this embodiment), which is different from the first and second color data, is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the second liquid crystal panel 60A.

[0234] In the second subframe SF2, a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the second liquid crystal panel 60A, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the second liquid crystal panel 60A, and a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the second liquid crystal panel 60A.

[0235] In the third subframe SF3, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the second liquid crystal panel 60A; a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the second liquid crystal panel 60A; and a voltage corresponding to the second color data (green data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the second liquid crystal panel 60A.

[0236] In the fourth subframe SF4, a voltage corresponding to the third color data (blue data in this embodiment) is written to a pixel belonging to one or more lines (the first line in this embodiment) included in the first group in the second liquid crystal panel 60A, a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the second line in this embodiment) included in the second group in the second liquid crystal panel 60A, and a voltage corresponding to the first color data (red data in this embodiment) is written to a pixel belonging to one or more lines (the third line in this embodiment) included in the third group in the second liquid crystal panel 60A.

[0237] In each subframe, the second color light L2 incident on the second liquid crystal panel 60A is scanned from the first line to the last line. During the period in which a voltage corresponding to red data is written to the second liquid crystal panel 60A, red light RL is emitted from the second light source device 20A as the second color light L2. During the period in which a voltage corresponding to green data is written to the second liquid crystal panel 60A, green light GL is emitted from the second light source device 20A as the second color light L2. During the period in which a voltage corresponding to blue data is written to the second liquid crystal panel 60A, blue light BL is emitted from the second light source device 20A as the second color light L2.

[0238] According to the fourth embodiment, in one frame, the colors of the first image light IL1 are perceived by humans in the order of white, cyan, white, and yellow, and the colors of the second image light IL2 are perceived by humans in the order of white, yellow, white, and magenta. As a result, in one frame, the composite image light CL is perceived by humans in the order of white, white, white, and white, so color breakup can be reduced even when the color rotation frequency is 60Hz. In other words, according to the fourth embodiment, it is possible to achieve both color gamut and brightness while reducing color breakup.

[0239] In the fourth embodiment, the control device 100 may control the first light source device 20, the first optical scanning device 40, and the first liquid crystal panel 60 to operate according to the timing chart shown in Figure 6, which was described in the first embodiment, and may also control the second light source device 20A, the second optical scanning device 40A, and the second liquid crystal panel 60A to operate according to the timing chart shown in Figure 6.

[0240] [Fifth Embodiment] Next, a fifth embodiment of this disclosure will be described. In the description of the fifth embodiment, explanations of content common to the fourth embodiment will be omitted, and only content that differs from the fourth embodiment will be described. Furthermore, regarding the configuration of the projector 203 of the fifth embodiment, components common to the projector 202 of the fourth embodiment will be denoted by the same reference numerals as the corresponding components of the projector 202 of the fourth embodiment, and their explanations will be omitted.

[0241] Figure 11 is a schematic diagram of the projector 203 of the fifth embodiment. As shown in Figure 11, the projector 203 of the fifth embodiment differs from the projector 202 of the fourth embodiment in that it further comprises an optical shift device 90 positioned between the photosynthetic element 77 and the projection optical system 80.

[0242] The optical shift device 90 shifts the optical path of the composite image light CL emitted from the photosynthesis element 77. The optical shift device 90 may be a biaxial shift device that shifts the optical path of the composite image light CL along two axes. The specific configuration of a biaxial shift device is known, as described in Japanese Patent Application Publication No. 2022-82000. Therefore, a detailed description of the specific configuration of a biaxial shift device is omitted in this specification.

[0243] Furthermore, the optical shift device 90 may be a uniaxial shift device that shifts the optical path of the composite image light CL along one axis. The specific configuration of a uniaxial shift device is publicly known, as described in Japanese Patent Application Publication No. 2018-54974. Therefore, a detailed explanation of the specific configuration of a uniaxial shift device is omitted in this specification.

[0244] By arranging the optical shift device 90 described above between the photosynthetic element 77 and the projection optical system 80, it is possible to achieve high resolution of the image projected onto the projection surface by the projector 203.

[0245] While preferred embodiments of this disclosure have been described in detail above, this disclosure is not limited to these specific embodiments, and various modifications and changes are possible within the scope of the gist of this disclosure. Furthermore, the components of multiple embodiments can be combined as appropriate.

[0246] [Summary of this disclosure] A summary of this disclosure is provided below. (Note 1) The system comprises a first light source device that emits one of red light, green light, and blue light as the first color light; a first liquid crystal panel having a plurality of lines arranged at predetermined intervals along the column direction and extending in the row direction, wherein each line is defined as an array of pixels connected to a single scan line; and a first optical scanning device that scans the first color light incident on the first liquid crystal panel along the column direction of the first liquid crystal panel, wherein in each of the plurality of subframes included in one frame, voltages corresponding to color data of red data, green data, and blue data are written to the pixels belonging to each line in order from the first line to the last line in the first liquid crystal panel. A projector wherein voltages corresponding to different color data are written to each of one or more lines, the first color light incident on the first liquid crystal panel is scanned from the first line to the last line, the red light is emitted from the first light source device as the first color light during the period in which the voltage corresponding to the red data is written to the first liquid crystal panel, the green light is emitted from the first light source device as the first color light during the period in which the voltage corresponding to the green data is written to the first liquid crystal panel, and the blue light is emitted from the first light source device as the first color light during the period in which the voltage corresponding to the blue data is written to the first liquid crystal panel.

[0247] According to the projector described in Appendix 1, in each subframe contained within a single frame, the color of the first image light is perceived as white by humans, thus reducing color breakup even when the color rotation frequency is 60Hz. In other words, according to the projector described in Appendix 1, it is possible to achieve both color gamut and brightness while reducing color breakup.

[0248] (Note 2) The frame includes a first subframe, a second subframe, and a third subframe, wherein in the first subframe, a voltage corresponding to first color data is written to a pixel belonging to one or more lines included in the first group in the first liquid crystal panel, a voltage corresponding to second color data different from the first color data is written to a pixel belonging to one or more lines included in the second group in the first liquid crystal panel, a voltage corresponding to third color data different from the first color data is written to a pixel belonging to one or more lines included in the third group in the first liquid crystal panel, and in the second subframe, a voltage corresponding to second color data is written to a pixel belonging to one or more lines included in the first group in the first liquid crystal panel, and one or more lines included in the second group in the first liquid crystal panel The projector as described in Appendix 1, wherein a voltage corresponding to the third color data is written to a pixel belonging to a certain number of lines, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group in the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first group in the first liquid crystal panel in the third subframe, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group in the first liquid crystal panel, and a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the third group in the first liquid crystal panel, and each of the first color data, second color data and third color data is one of the red data, green data and blue data.

[0249] According to the projector described in Appendix 2, in a single frame containing three subframes, the colors of the first image light are perceived by humans in the order of white, white, and white. Therefore, even with a color rotation frequency of 60Hz, it is possible to achieve both color gamut and brightness while reducing color breakup.

[0250] (Note 3) Each frame includes a first subframe, a second subframe, a third subframe, and a fourth subframe, wherein in the first subframe, a voltage corresponding to first color data is written to a pixel belonging to one or more lines included in the first group in the first liquid crystal panel, a voltage corresponding to second color data different from the first color data is written to a pixel belonging to one or more lines included in the second group in the first liquid crystal panel, a voltage corresponding to third color data different from the first color data is written to a pixel belonging to one or more lines included in the third group in the first liquid crystal panel, a voltage corresponding to second color data is written to a pixel belonging to one or more lines included in the first group in the first liquid crystal panel, a voltage corresponding to third color data different from the first color data is written to a pixel belonging to one or more lines included in the first group in the first liquid crystal panel, a voltage corresponding to second color data is written to a pixel belonging to one or more lines included in the third group in the first liquid crystal panel The following is written, and in the third subframe, the voltage corresponding to the third color data is written to the pixels belonging to one or more lines included in the first group in the first liquid crystal panel, the voltage corresponding to the second color data is written to the pixels belonging to one or more lines included in the second group in the first liquid crystal panel, the voltage corresponding to the first color data is written to the pixels belonging to one or more lines included in the third group in the first liquid crystal panel, and in the fourth subframe, the voltage corresponding to the second color data is written to the pixels belonging to one or more lines included in the first group in the first liquid crystal panel, the voltage corresponding to the first color data is written to the pixels belonging to one or more lines included in the second group in the first liquid crystal panel, the voltage corresponding to the second color data is written to the pixels belonging to one or more lines included in the third group in the first liquid crystal panel, and each of the first color data, second color data and third color data is one of the red data, green data and blue data.The projector described in Appendix 1.

[0251] According to the projector described in Appendix 3, in one frame, the colors of the first image light are perceived by humans in the order of white, cyan (complementary color), white, and yellow (complementary color). Thus, in the projector described in Appendix 3, complementary colors are mixed in among the colors perceived by humans within one frame, so the effect of reducing color breakup is lower than that of the projector described in Appendix 2. However, compared to the projector described in Appendix 2, the projector described in Appendix 3 has a longer green light emission period within one frame, which can improve the brightness of the image perceived by humans.

[0252] (Note 4) The frame includes a first subframe, a second subframe, a third subframe, and a fourth subframe, wherein in the first subframe, a voltage corresponding to first color data is written to a pixel belonging to one or more lines included in the first group in the first liquid crystal panel, a voltage corresponding to second color data different from the first color data is written to a pixel belonging to one or more lines included in the second group in the first liquid crystal panel, a voltage corresponding to third color data different from the first color data is written to a pixel belonging to one or more lines included in the third group in the first liquid crystal panel, a voltage corresponding to second color data different from the first color data is written to a pixel belonging to one or more lines included in the first group in the first liquid crystal panel, a voltage corresponding to first color data is written to a pixel belonging to one or more lines included in the second group in the first liquid crystal panel, and a voltage corresponding to first color data is written to a pixel belonging to one or more lines included in the third group in the first liquid crystal panel. Voltage is written, and in the third subframe, voltages corresponding to the first color data are written to pixels belonging to one or more lines included in the first group in the first liquid crystal panel, voltages corresponding to the third color data are written to pixels belonging to one or more lines included in the second group in the first liquid crystal panel, voltages corresponding to the second color data are written to pixels belonging to one or more lines included in the third group in the first liquid crystal panel, and in the fourth subframe, voltages corresponding to the third color data are written to pixels belonging to one or more lines included in the first group in the first liquid crystal panel, voltages corresponding to the first color data are written to pixels belonging to one or more lines included in the second group in the first liquid crystal panel, and voltages corresponding to the first color data are written to pixels belonging to one or more lines included in the third group in the first liquid crystal panel, and each of the first color data, second color data and third color data is one of the red data, green data and blue data.The projector described in Appendix 1.

[0253] According to the projector described in Appendix 4, in one frame, the colors of the first image light are perceived by humans in the order of white, yellow (complementary color), white, and magenta (complementary color). Thus, in the projector described in Appendix 4, complementary colors are mixed in among the colors perceived by humans within one frame, so the effect of reducing color breakup is lower than that of the projector described in Appendix 2. However, compared to the projector described in Appendix 2, the projector described in Appendix 4 has a longer period of red light emission within one frame, so it can improve the white balance of the image perceived by humans.

[0254] (Note 5) The projector according to any one of Notes 1 to 4, wherein each of the plurality of subframes includes an odd field which is the first half of the period and an even field which is the second half of the period, wherein in the odd field, a voltage corresponding to different color data for each of the one or more lines and having a first polarity is written to the first liquid crystal panel, and the emission of the first color light from the first light source is stopped, and in the even field, a voltage corresponding to different color data for each of the one or more lines and having a second polarity which is the opposite polarity to the first polarity is written to the first liquid crystal panel, and the first color light incident on the first liquid crystal panel is scanned from the first line to the last line.

[0255] According to the projector described in Appendix 5, the first color light is emitted from the first light source only during the period when even-numbered fields, i.e., voltages of the second polarity, are written to each subframe, thus suppressing crosstalk in the projected image.

[0256] (Note 6) The device further comprises: a second light source device that emits one of the red light, green light, and blue light as a second color light; a second liquid crystal panel having a plurality of lines arranged at predetermined intervals along the column direction and extending in the row direction, wherein each line is defined as an array of pixels connected to a single scan line; a second optical scanning device that scans the second color light incident on the second liquid crystal panel along the column direction of the second liquid crystal panel; and a photosynthesis element that generates a composite image light by combining a first image light generated by the modulation of the first color light by the first liquid crystal panel and a second image light generated by the modulation of the second color light by the second liquid crystal panel, wherein in each of the plurality of subframes, in the second liquid crystal panel, each line is sequentially processed from the first line to the last line The projector as described in Appendix 1, wherein a voltage corresponding to one of the color data (red data, green data, and blue data) is written to a pixel belonging to the line, and a voltage corresponding to a different color data is written for each of the one or more lines, the second color light incident on the second liquid crystal panel is scanned from the first line to the last line, the red light is emitted from the second light source as the second color light during the period when the voltage corresponding to the red data is written to the second liquid crystal panel, the green light is emitted from the second light source as the second color light during the period when the voltage corresponding to the green data is written to the second liquid crystal panel, and the blue light is emitted from the second light source as the second color light during the period when the voltage corresponding to the blue data is written to the second liquid crystal panel.

[0257] According to the projector described in Appendix 6, it is possible to improve the brightness of the composite image light projected from the projector, while simultaneously reducing color breakup and achieving a balance between color gamut and brightness.

[0258] (Note 7) The frame includes a first subframe, a second subframe, a third subframe, and a fourth subframe, wherein in the first subframe, voltages corresponding to first color data are written to pixels belonging to one or more lines included in the first group in the first liquid crystal panel and the second liquid crystal panel, voltages corresponding to second color data different from the first color data are written to pixels belonging to one or more lines included in the second group in the first liquid crystal panel and the second liquid crystal panel, voltages corresponding to third color data different from the first and second color data are written to pixels belonging to one or more lines included in the third group in the first liquid crystal panel and the second liquid crystal panel, voltages corresponding to second color data different from the first and second color data are written to pixels belonging to one or more lines included in the first group in the first liquid crystal panel and the third group in the first liquid crystal panel A voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the second liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group in the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group in the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group in the second liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first group in the third subframe, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first liquid crystal panel in the first liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the third group in the first liquid crystal panel,A voltage corresponding to the first color data is written, and in the second liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the second group, and in the second liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the third group, and in the fourth subframe, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group, and in the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group, and in the first liquid crystal panel, the third group The projector as described in Appendix 6, wherein a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the second liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first group in the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group in the second liquid crystal panel, and a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group in the second liquid crystal panel, and each of the first color data, second color data and third color data is one of the red data, green data and blue data.

[0259] According to the projector described in Appendix 7, in one frame, the colors of the first image light are perceived by humans in the order of white, cyan, white, and yellow, and the colors of the second image light are perceived by humans in the order of white, yellow, white, and magenta. As a result, in one frame, the composite image light is perceived by humans in the order of white, white, white, and white, so color breakup can be reduced even when the color rotation frequency is 60Hz. In other words, according to the projector described in Appendix 7, it is possible to achieve both color gamut and brightness while reducing color breakup.

[0260] (Note 8) The projector according to Note 6 or Note 7, further comprising an optical shift device for shifting the optical path of the synthesized image light emitted from the photosynthetic element.

[0261] According to the projector described in Appendix 8, since it is equipped with an optical shift device that shifts the optical path of the synthesized image light emitted from the photosynthetic element, it is possible to achieve high resolution of the image projected onto the projection surface by the projector. [Explanation of Symbols]

[0262] 201, 202, 203…Projector, 20…First light source device, 40…First optical scanning device, 60…First liquid crystal panel, 20A…Second light source device, 40A…Second optical scanning device, 60A…Second liquid crystal panel, 71…P-polarization optical system, 72…First incident polarizer, 73…First exit polarizer, 74…S-polarization optical system, 75…Second incident polarizer, 76…Second exit polarizer, 77…Photosynthesis element, 80…Projection optical system, 90…Optical shift device, 100…Control device

Claims

1. A first light source device that emits one of red, green, or blue light as the first color light, A first liquid crystal panel having a plurality of lines arranged at predetermined intervals along the column direction and extending in the row direction, wherein each line is defined as an array of pixels connected to a single scan line, A first optical scanning device scans the first color light incident on the first liquid crystal panel along the column direction of the first liquid crystal panel, Equipped with, In each of the multiple subframes contained within a single frame, In the first liquid crystal panel, voltages corresponding to one of the color data (red data, green data, or blue data) are written to the pixels belonging to each line in order from the first line to the last line, and voltages corresponding to different color data are written for each of the one or more lines. The first color light incident on the first liquid crystal panel is scanned from the first line toward the last line, During the period in which the voltage corresponding to the red data is written to the first liquid crystal panel, the red light is emitted from the first light source device as the first color light. During the period in which the voltage corresponding to the green data is written to the first liquid crystal panel, the green light is emitted from the first light source device as the first color light. During the period in which the voltage corresponding to the blue data is written to the first liquid crystal panel, the blue light is emitted from the first light source device as the first color light. projector.

2. The aforementioned frame includes a first subframe, a second subframe, and a third subframe. In the aforementioned first subframe, In the first liquid crystal panel, a voltage corresponding to the first color data is written to one or more pixels belonging to lines included in the first group. In the first liquid crystal panel, a voltage corresponding to second color data different from the first color data is written to one or more lines belonging to the second group. In the first liquid crystal panel, a voltage corresponding to a third color data different from the first color data and the second color data is written to one or more pixels belonging to a line included in the third group. In the aforementioned second subframe, In the first liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group. In the aforementioned third subframe, In the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the second color data is written to one or more pixels belonging to lines included in the third group. Each of the first color data, the second color data, and the third color data is one of the red data, the green data, and the blue data. The projector according to claim 1.

3. The aforementioned frame includes a first subframe, a second subframe, a third subframe, and a fourth subframe. In the aforementioned first subframe, In the first liquid crystal panel, a voltage corresponding to the first color data is written to one or more pixels belonging to lines included in the first group. In the first liquid crystal panel, a voltage corresponding to second color data different from the first color data is written to one or more lines belonging to the second group. In the first liquid crystal panel, a voltage corresponding to a third color data different from the first color data and the second color data is written to one or more pixels belonging to a line included in the third group. In the aforementioned second subframe, In the first liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the second color data is written to one or more pixels belonging to lines included in the third group. In the aforementioned third subframe, In the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the second color data is written to one or more pixels belonging to lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group. In the aforementioned fourth subframe, In the first liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the second color data is written to one or more pixels belonging to lines included in the third group. Each of the first color data, the second color data, and the third color data is one of the red data, the green data, and the blue data. The projector according to claim 1.

4. The aforementioned frame includes a first subframe, a second subframe, a third subframe, and a fourth subframe. In the aforementioned first subframe, In the first liquid crystal panel, a voltage corresponding to the first color data is written to one or more pixels belonging to lines included in the first group. In the first liquid crystal panel, a voltage corresponding to second color data different from the first color data is written to one or more lines belonging to the second group. In the first liquid crystal panel, a voltage corresponding to a third color data different from the first color data and the second color data is written to one or more pixels belonging to a line included in the third group. In the aforementioned second subframe, In the first liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group. In the aforementioned third subframe, In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the second color data is written to one or more pixels belonging to lines included in the third group. In the aforementioned fourth subframe, In the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group. Each of the first color data, the second color data, and the third color data is one of the red data, the green data, and the blue data. The projector according to claim 1.

5. Each of the aforementioned subframes includes an odd-numbered field representing the first half of the period and an even-numbered field representing the second half of the period. In the aforementioned odd field, In the first liquid crystal panel, a voltage corresponding to different color data and having a first polarity is written to each of the one or more lines. The emission of the first color light from the first light source device is stopped. In the aforementioned even fields, In the first liquid crystal panel, a voltage is written to each of the one or more lines that corresponds to different color data and has a second polarity that is the opposite polarity to the first polarity. The first color light incident on the first liquid crystal panel is scanned from the first line toward the last line. The projector according to claim 1.

6. A second light source device that emits one of the aforementioned red light, green light, and blue light as a second color light, A second liquid crystal panel having a plurality of lines arranged at predetermined intervals along the column direction and extending in the row direction, wherein each line is defined as an array of pixels connected to a single scan line, A second optical scanning device scans the second color light incident on the second liquid crystal panel along the column direction of the second liquid crystal panel, A photosynthetic element that generates a composite image light by combining a first image light generated by modulating the first color light with the first liquid crystal panel and a second image light generated by modulating the second color light with the second liquid crystal panel, Furthermore, In each of the aforementioned subframes, In the second liquid crystal panel, voltages corresponding to one of the color data (red data, green data, and blue data) are written to the pixels belonging to each line in order from the first line to the last line, and voltages corresponding to different color data are written for each line or more lines. The second color light incident on the second liquid crystal panel is scanned from the first line toward the last line, During the period in which the voltage corresponding to the red data is written to the second liquid crystal panel, the red light is emitted from the second light source device as the second color light. During the period in which the voltage corresponding to the green data is written to the second liquid crystal panel, the green light is emitted from the second light source device as the second color light. During the period in which the voltage corresponding to the blue data is written to the second liquid crystal panel, the blue light is emitted from the second light source device as the second color light. The projector according to claim 1.

7. The aforementioned frame includes a first subframe, a second subframe, a third subframe, and a fourth subframe. In the aforementioned first subframe, In the first liquid crystal panel and the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel and the second liquid crystal panel, a voltage corresponding to second color data different from the first color data is written to one or more lines belonging to the second group. In the first liquid crystal panel and the second liquid crystal panel, a voltage corresponding to a third color data different from the first color data and the second color data is written to one or more lines belonging to the third group. In the aforementioned second subframe, In the first liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the second color data is written to one or more pixels belonging to lines included in the third group. In the second liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group. In the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group. In the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group. In the aforementioned third subframe, In the first liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the second color data is written to one or more pixels belonging to lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group. In the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the first group. In the second liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the second group. In the second liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the third group. In the aforementioned fourth subframe, In the first liquid crystal panel, a voltage corresponding to the second color data is written to a pixel belonging to one or more lines included in the first group. In the first liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group. In the first liquid crystal panel, a voltage corresponding to the second color data is written to one or more pixels belonging to lines included in the third group. In the second liquid crystal panel, a voltage corresponding to the third color data is written to a pixel belonging to one or more lines included in the first group. In the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the second group. In the second liquid crystal panel, a voltage corresponding to the first color data is written to a pixel belonging to one or more lines included in the third group. Each of the first color data, the second color data, and the third color data is one of the red data, the green data, and the blue data. The projector according to claim 6.

8. The projector according to claim 6 or 7, further comprising an optical shift device for shifting the optical path of the synthesized image light emitted from the photosynthetic element.

Images