Display device, display method, and program

Abstract

To provide a display device, a display method, and a program, which can appropriately enhance resolution with a simple configuration.SOLUTION: A display device includes: an oscillating portion; an actuator that oscillates the oscillating portion; a video signal processing circuit that performs processing of switching and displaying a red sub-frame, a blue sub-frame, a first green sub-frame, and a second green sub-frame, and not continuously displaying the first green sub-frame and the second green sub-frame, during one frame of a video signal; and a driving circuit that controls an optical path by causing the actuator to oscillate the oscillating portion. The video signal processing circuit causes the first green sub-frame and the second green sub-frame to be displayed at positions point-symmetric to each other with respect to a reference position, causes the first green sub-frame and one of the red sub-frame and the blue sub-frame to be displayed at the same position with respect to the reference position, and causes the second green sub-frame and the other of the red sub-frame and the blue sub-frame to be displayed at the same position with respect to the reference position.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a display device, a display method, and a program. [Background technology]

[0002] In an image display device using a liquid crystal light modulation device, a method is known in which the optical paths of the light of each color are shifted to increase the apparent resolution of the image projected onto a screen or the like beyond the resolution of the light modulation device.

[0003] For example, Patent Document 1 listed below discloses a projection system comprising a red light modulation means for modulating a red pixel, a blue light modulation means for modulating a blue pixel, a first green light modulation means for modulating a first green pixel, and a second green light modulation means for modulating a second green pixel, and characterized in that the red pixel, blue pixel, first and second green pixel are projected onto a screen. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-322908 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the projection system described in Patent Document 1 uses four light modulation devices, making it a very expensive system. Therefore, there has been a demand for a cheaper method to increase the resolution of the projected image beyond the resolution of the light modulation devices.

[0006] In view of the above-described problems, the present disclosure aims to provide a display device, a display method, and a program that can appropriately increase resolution with a simple configuration. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, a display device according to the present disclosure includes a swinging unit having an optical member onto which light is incident, an actuator that swings the swinging unit, a video signal processing circuit that divides one frame of a video signal into a red subframe, a blue subframe, a first green subframe, and a second green subframe, and switches between displaying the red subframe, the blue subframe, the first green subframe, and the second green subframe during one frame of the video signal, and performs processing to prevent the first green subframe and the second green subframe from being displayed consecutively, and a drive circuit that causes the actuator to swing the swinging unit to control a light path, and the video signal processing circuit displays the first green subframe during a period in which the swinging unit is facing a first direction, By displaying the second green subframe during a period in which the oscillating portion faces a second direction different from the first direction, displaying one of the red subframe or the blue subframe during a period in which the oscillating portion faces the first direction, and displaying the other of the red subframe or the blue subframe during a period in which the oscillating portion faces the second direction, the first green subframe and the second green subframe are displayed at positions that are point-symmetrical to each other with respect to a reference position, one of the red subframe or the blue subframe and the first green subframe are displayed at the same position with respect to the reference position, and the other of the red subframe or the blue subframe and the second green subframe are displayed at the same position with respect to the reference position.

[0008] In order to solve the above-mentioned problems and achieve the object, a display method according to the present disclosure is a display method using a display device including a swinging unit having an optical member onto which light is incident, and an actuator that swings the swinging unit, the display method including the steps of: dividing one frame of a video signal into a red subframe, a blue subframe, a first green subframe, and a second green subframe; switching between displaying the red subframe, the blue subframe, the first green subframe, and the second green subframe during one frame of the video signal, and not displaying the first green subframe and the second green subframe consecutively; and swinging the swinging unit with an actuator to control a light path; a first green subframe and a second green subframe in a period in which the swinging portion faces a second direction different from the first direction; a second green subframe and a third green subframe in a period in which the swinging portion faces the first direction; a red subframe or a blue subframe in a period in which the swinging portion faces the second direction; and a second green subframe and a third green subframe in a period in which the swinging portion faces the second direction.

[0009] In order to solve the above-mentioned problems and achieve the object, a program according to the present disclosure is a program for causing a computer of a display device to execute processing, the program including a swinging unit having an optical member onto which light is incident, and an actuator for swinging the swinging unit, the program including the steps of: dividing one frame of a video signal into a red subframe, a blue subframe, a first green subframe, and a second green subframe; switching between displaying the red subframe, the blue subframe, the first green subframe, and the second green subframe during one frame of the video signal, and not displaying the first green subframe and the second green subframe consecutively; and controlling an optical path by swinging the swinging unit with an actuator, By displaying a green subframe, displaying the second green subframe during a period in which the swinging portion faces a second direction different from the first direction, displaying one of the red subframe or the blue subframe during a period in which the swinging portion faces the first direction, and displaying the other of the red subframe or the blue subframe during a period in which the swinging portion faces the second direction, the first green subframe and the second green subframe are displayed at positions that are point-symmetrical to each other with respect to a reference position, one of the red subframe or the blue subframe and the first green subframe are displayed at the same position with respect to the reference position, and the other of the red subframe or the blue subframe and the second green subframe are displayed at the same position with respect to the reference position. [Effects of the Invention]

[0010] According to the present disclosure, it is possible to provide a display device, a display method, and a program that can appropriately increase resolution with a simple configuration. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram schematically illustrating the structure of a display device according to the present disclosure. [Figure 2] FIG. 2 is a block diagram schematically showing the circuit configuration of the display device according to the present disclosure. [Figure 3] FIG. 3 is a plan view of the optical path control mechanism according to the first embodiment of the present disclosure. [Figure 4] FIG. 4 is a cross-sectional view of the optical path control mechanism according to the first embodiment of the present disclosure taken along line IV-IV. [Figure 5] FIG. 5 is a VV cross-sectional view of the optical path control mechanism according to the first embodiment of the present disclosure. [Figure 6] FIG. 6 is a perspective view of a swinging portion of the optical path control mechanism according to the first embodiment of the present disclosure. [Figure 7] FIG. 7 is a schematic diagram illustrating an image display according to the first embodiment. [Figure 8] FIG. 8 is a graph illustrating the waveform of the drive signal of the drive unit according to the first embodiment of the present disclosure. [Figure 9] FIG. 9 is a graph illustrating the oscillation pattern of the optical portion according to the first embodiment of the present disclosure. [Figure 10] FIG. 10 is an explanatory diagram illustrating a biaxial swing pattern of the optical part according to the first embodiment of the present disclosure. [Figure 11] FIG. 11 is a schematic diagram of an optical path control mechanism according to the second embodiment of the present disclosure. [Figure 12] FIG. 12 is a cross-sectional view taken along the line AA of the optical path control mechanism according to the second embodiment of the present disclosure. [Figure 13A] FIG. 13A is a schematic diagram illustrating an image display according to the second embodiment. [Figure 13B] FIG. 13B is a graph illustrating the waveform of the drive signal of the drive unit according to the second embodiment of the present disclosure. [Figure 14] FIG. 14 is a graph illustrating the oscillation pattern of the optical portion according to the second embodiment of the present disclosure. [Figure 15] FIG. 15 is an explanatory diagram illustrating a one-axis swing pattern of the optical portion according to the second embodiment of the present disclosure. [Figure 16A] FIG. 16A is a schematic diagram illustrating an image display according to the third embodiment. [Figure 16B] FIG. 16B is a graph illustrating the waveform of the drive signal of the drive unit according to the third embodiment of the present disclosure. [Figure 17] FIG. 17 is a graph illustrating the swing pattern of the optical portion according to the third embodiment of the present disclosure. [Figure 18] FIG. 18 is an explanatory diagram illustrating a one-axis swing pattern of the optical portion according to the third embodiment of the present disclosure. [Figure 19A] FIG. 19A is a schematic diagram illustrating an image display according to the fourth embodiment. [Figure 19B] FIG. 19B is a graph illustrating the waveform of the drive signal of the drive unit according to the fourth embodiment of the present disclosure. [Figure 20] FIG. 20 is a graph illustrating the oscillation pattern of the optical portion according to the fourth embodiment of the present disclosure. [Figure 21] FIG. 21 is an explanatory diagram illustrating a one-axis swing pattern of the optical portion according to the fourth embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. However, the present disclosure is not limited to the embodiments described below.

[0013] (First embodiment) (Schematic configuration of image display device) First, an outline of the configuration of an image display device according to the present disclosure will be described with reference to Fig. 1. Fig. 1 is a diagram schematically illustrating the structure of the display device according to the present disclosure.

[0014] As shown in FIG. 1, the display device 1 has a light path control device 10 and an irradiation device 100. The irradiation device 100 is a device that irradiates the light path control device 10 with light L for an image. The light path control device 10 is a device that controls the optical path of the light L. The light path control device 10 shifts the optical axis of the light L to shift the position of the image projected by the light L, thereby increasing the resolution of the projected image compared to the resolution of the image projected by the irradiation device 100 (i.e., the number of pixels of the display element 106, which will be described later).

[0015] The irradiation device 100 includes light sources 101R, 101G, and 101B, lenses 140A, 140B, 140C, and 140D, dichroic mirrors 120A and 120B, a polarizing beam splitter 105, a display element 106, a projection lens 109, and a video signal processing circuit 160.

[0016] The light sources 101R, 101G, and 101B are light sources that generate and irradiate light. As shown in Fig. 1, the light sources 101R, 101G, and 101B irradiate red light LR, green light LG, and blue light LB, respectively. The light sources 101R, 101G, and 101B may be realized by LEDs (Light Emitting Diodes) or laser diodes that emit light corresponding to the respective colors.

[0017] Lenses 140A, 140B, 140C, and 140D are optical elements that refract light to diverge or converge it. Lenses 140A, 140B, and 140C may be, for example, two fly's eye lenses. A fly's eye lens is a lens array in which single lenses are arranged vertically and horizontally in a matrix. Lenses 140A, 140B, and 140C split the incident light beam according to the number of single lenses using the first decentered fly's eye lens. Lenses 140A, 140B, and 140C then guide each of the split light beams to the irradiation area using the second decentered fly's eye lens.

[0018] That is, the illuminance distribution of the light incident on lenses 140A, 140B, and 140C is made uniform on the irradiation surface. Green light LG that has passed through lens 140A and blue light LB that has passed through 140B are irradiated onto dichroic mirror 120A. Red light LR that has passed through lens 140C is irradiated onto dichroic mirror 120B. Lens 140D may be a condenser lens.

[0019] Dichroic mirrors 120A and 120B are a type of mirror made of a special optical material (for example, a multilayer film made by alternating thin films of a specific thickness with high and low refractive indexes), which reflects light of a specific wavelength and transmits light of other wavelengths.

[0020] Dichroic mirror 120A combines the incident green light LG and blue light LB into green-blue light containing both components. The green-blue light combined by dichroic mirror 120A is incident on lens 140D, which is a condenser lens, where it is collected, and then incident on dichroic mirror 120B.

[0021] The dichroic mirror 120B combines the incident green-blue light and red light LR into combined light containing both components. The combined light combined by the dichroic mirror 120B is irradiated onto the polarizing beam splitter 105.

[0022] Polarizing beam splitter 105 has the property of reflecting either s-polarized light or p-polarized light and transmitting the other. For example, polarizing beam splitter 105 may be one that reflects s-polarized light and transmits p-polarized light. Polarizing beam splitter 105 is also called a reflective polarizer. Note that s-polarized light (derived from the German word senkrecht) is light whose electric field is polarized perpendicular to the plane of incidence, and p-polarized light (derived from the German word parallel) is light whose electric field is polarized parallel to the plane of incidence.

[0023] For example, if the red light LR, green light LG, and blue light LB emitted from the light source are p-polarized light, the polarizing beam splitter 105 operates as follows: The p-polarized red light LR, green light LG, and blue light LB pass through the polarizing beam splitter 105 and are irradiated onto the display element 106.

[0024] The display element 106 is, for example, a reflective liquid crystal display element. A reflective liquid crystal display element has mirror-like reflective pixel electrodes arranged on a silicon substrate, and a drive circuit using semiconductor elements such as CMOS (Complementary Metal Oxide Semiconductor) is embedded underneath. A glass substrate facing the silicon substrate includes transparent electrodes, color filters, a liquid crystal layer, and polarizers. The orientation of the liquid crystal is controlled by the voltage applied between the drive circuit and the reflective pixel electrodes, thereby controlling the reflection of light at the reflective pixel electrodes. The display element 106 is controlled by a video signal processing circuit 160.

[0025] The video signal processing circuit 160 controls the drive circuit of the display element 106 based on the image data. The display element 106 controls the orientation of the liquid crystal in response to the control of the video signal processing circuit 160, and controls the amount of light that strikes the reflective pixel electrode by controlling the transmission of light through the liquid crystal. The light reflected by the reflective pixel electrode is irradiated onto the liquid crystal layer, and optically modulates the p-polarized light to generate s-polarized light.

[0026] The light L, which is a combination of s-polarized red light LR, green light LG, and blue light LB generated by the display element 106, is reflected by the polarizing beam splitter 105 and is irradiated onto the optical path control mechanism 12.

[0027] Although the irradiation device 100 has the above-described configuration, the configuration is not limited to the above description and may have any configuration.

[0028] The light path control device 10 has a light path control mechanism 12, a control circuit (controller) 14, and a drive circuit (driver) 16. The light path control mechanism 12 is a mechanism that oscillates when driven by the drive circuit 16. The light path control mechanism 12 is provided between the polarizing beam splitter 105 and the projection lens 109 in the direction along the optical path of the light L.

[0029] The optical path control mechanism 12 oscillates while receiving the light L from the polarizing beam splitter 105, thereby shifting the traveling direction (optical path) of the light L and outputting it toward the projection lens 109. In this way, the optical path control device 10 controls the optical path of the light L so that the optical path of the light L is shifted. Note that the position at which the optical path control mechanism 12 is provided is not limited to between the polarizing beam splitter 105 and the projection lens 109, and may be any position. The operation of the optical path control mechanism 12 will be described later.

[0030] (Functional configuration of the display device) Next, the configuration of the display device 1 according to the present disclosure will be described with reference to Fig. 2. Fig. 2 is a block diagram that schematically shows the circuit configuration of the display device.

[0031] 2, the video signal processing circuit 160 controls the display element 106. Image data for controlling the display element 106 and a video signal including a synchronization signal are input to the video signal processing circuit 160. The video signal processing circuit 160 controls the display element 106 based on the image data while synchronizing the timing based on the synchronization signal.

[0032] The control circuit 14 has a digital circuit 14A and a converter 14B. A synchronization signal is input to the digital circuit 14A from the video signal processing circuit 160. The digital circuit 14A generates a digital drive signal for driving the optical path control mechanism 12 while synchronizing the timing based on the synchronization signal.

[0033] The converter 14B is a DA converter that converts a digital signal into an analog signal, and converts the digital drive signal generated by the digital circuit 14A into an analog drive signal.

[0034] The drive circuit 16 receives the analog drive signal from the converter 14B, amplifies the analog drive signal, and outputs it to an actuator 12B of the optical path control mechanism 12, which will be described later. The actuator 12B is driven in response to the drive signal to oscillate an oscillating portion 12A, which will be described later.

[0035] (Optical path control mechanism) Next, the light path control mechanism 12 according to the present disclosure will be described with reference to Figures 3, 4, and 5. Figure 3 is a plan view of the light path control mechanism according to the first embodiment of the present disclosure. Figure 4 is a cross-sectional view taken along line IV-IV of the light path control mechanism according to the first embodiment of the present disclosure. Figure 5 is a cross-sectional view taken along line VV of the light path control mechanism according to the first embodiment of the present disclosure.

[0036] As shown in FIGS. 3 to 5, the light path control mechanism 12 has a swinging part 12A including an optical member (optical part) 20 onto which light L is incident, and an actuator 12B that swings the swinging part 12A.

[0037] The actuator 12B oscillates the oscillating unit 12A about a first oscillation axis AX and a second oscillation axis BX that are aligned along two directions that intersect (preferably perpendicular) with the direction in which light L is incident on the optical member 20. The first oscillation axis AX and the second oscillation axis BX are preferably perpendicular to each other. Therefore, the optical path control mechanism 12 includes a first oscillation unit 21A and a second oscillation unit 21B as the oscillating unit 12A, a first axis unit 23A and a second axis unit 23B that are aligned along the first oscillation axis AX and the second oscillation axis BX, a first actuator 25 and a second actuator 26 as the actuator 12B, and a support unit 27.

[0038] The optical member 20 is a member that transmits incident light L. The light L is incident on one surface of the optical member 20, the optical member 20 transmits the incident light L, and the light L is emitted from the other surface. The optical member 20 is a glass plate, but the material and shape may be arbitrary.

[0039] The first oscillating part 21A has the optical member 20 and a first movable part 31. The first movable part 31 is a member that supports the optical member 20. The first movable part 31 is fixed to the optical member 20. Specifically, the first movable part 31 is a frame-shaped member made of a plate material with a through-hole 31a formed in the center. The optical member 20 is fixed to the first movable part 31 in a state where it is fitted into the through-hole 31a of the first movable part 31. Note that the optical member 20 is fixed to the first movable part 31 via a fixing member or adhesive for fixing it to the first movable part 31, but the method of fixing the optical member 20 to the first movable part 31 may be arbitrary.

[0040] The second oscillating part 21B is disposed outside the first oscillating part 21A. The second oscillating part 21B has a second movable part 32. The second movable part 32 is a member that supports the first movable part 31. The first movable part 31 is supported by the second movable part 32 so as to be able to oscillate freely around a first oscillation axis AX. Specifically, the second movable part 32 is a frame-shaped member made of a plate material with a through hole 32a formed in its center. The first movable part 31 is supported by the second movable part 32 so as to be able to oscillate freely in the through hole 32a of the second movable part 32 with a predetermined gap between them. The first movable part 31 and the second movable part 32 are connected by a pair of first shaft parts 23A that are aligned along the first oscillation axis AX. The first movable part 31 oscillates around the first oscillation axis AX as the pair of first shaft parts 23A elastically deform so as to be twisted relative to the second movable part 32.

[0041] The support part 27 is disposed outside the second oscillation part 21B. The support part 27 is a member that supports the second movable part 32. The second movable part 32 is supported by the support part 27 so as to be able to oscillate freely around the second oscillation axis BX. Specifically, the support part 27 is a frame-shaped member made of a plate material with a through hole 27a formed in the center. The second movable part 32 is supported by the support part 27 so as to be able to oscillate freely, with a predetermined gap being provided in the through hole 27a of the support part 27. The second movable part 32 and the support part 27 are connected by a pair of second shaft parts 23B that extend along the second oscillation axis BX. The second movable part 32 oscillates around the second oscillation axis BX as the pair of second shaft parts 23B elastically deform so as to be twisted relative to the support part 27.

[0042] The second movable part 32 (second oscillating part 21B) oscillates around the second oscillating axis BX with respect to the support part 27, with the pair of second shaft parts 23B as fulcrums. The first movable part 31 (first oscillating part 21A) oscillates around the first oscillating axis AX with respect to the second movable part 32, with the pair of first shaft parts 23A as fulcrums. Therefore, the optical element 20 fixed to the second movable part 32 can oscillate around the first oscillating axis AX and the second oscillating axis BX. When the optical element 20 oscillates around the first oscillating axis AX and the second oscillating axis BX, the posture of the optical element 20 changes, and the optical path of the light L passing through the optical element 20 can be shifted.

[0043] In the first embodiment, the first movable part 31, the second movable part 32, the first shaft part 23A, and the second shaft part 23B are integrally formed. Therefore, the first movable part 31 swings relative to the second movable part 32 as the first shaft part 23A elastically deforms so as to be twisted in the circumferential direction. However, the first movable part 31, the second movable part 32, and the first shaft part 23A may be formed separately and then connected. Also, one end and the other end of the second movable part 32 in the axial direction of the second swing axis BX are fixed to be connected to the support part 27, and the second shaft parts 23B are formed at each end of the second movable part 32. However, the second shaft parts 23B may be provided at each end of the second movable part 32, and each second shaft part 23B may be fixed to be directly connected to the support part 27. Furthermore, the second movable part 32, the second shaft part 23B, and the support part 27 may be formed integrally.

[0044] The first actuator 25 oscillates the first movable part 31 (first oscillating part 21A) about the first oscillation axis AX with respect to the support part 27, using the pair of first shaft parts 23A as fulcrums. The first actuator 25 is disposed on both one side and the other side of the first oscillation axis AX in the radial direction (axial direction of the second oscillation axis BX). The first actuator 25 has a coil 41, a yoke 42, and a magnet 43.

[0045] The coil 41 is attached to the first movable part 31 and fixed to a coil attachment part 31b provided on the first movable part 31. The coils 41 are provided at both ends of the first movable part 31 in the radial direction of the first oscillation axis AX (one side and the other side in the axial direction of the second oscillation axis BX). The yoke 42 is a member that forms a magnetic path. The yoke 42 is attached to the support part 27 and fixed relative to the support part 27. The yokes 42 are arranged at both ends of the first movable part 31 corresponding to the coils 41. The magnets 43 are permanent magnets. The magnets 43 are attached to the yoke 42 and fixed relative to the yoke 42. The magnets 43 are arranged in positions adjacent to the respective coils 41.

[0046] A drive signal is input to the coil 41 from the drive circuit 16 (see FIG. 2). In the example shown in FIG. 5, a magnet 43 is attached to one side of a U-shaped yoke 42, and an air gap is formed between the unattached surface of the magnet 43 and the opposing U-shaped surface of the yoke 42. The coil 41 is disposed within the air gap. When a drive signal is input to the coil 41, a current flows through the coil 41, which is a conductor located within the air gap (magnetic field) formed by the magnet 43 and the yoke 42, and the coil 41 is subjected to an electromagnetic force. This electromagnetic force causes the first movable part 31 (first oscillating part 21A) fixed to the coil 41 to oscillate. In other words, the first actuator 25 can be said to be an electromagnetic actuator composed of the coil 41, the yoke 42, and the magnet 43.

[0047] The second actuator 26 oscillates the second movable part 32 (second oscillating part 21B) about the second oscillating axis BX with respect to the support part 27, with the pair of second shaft parts 23B as fulcrums. The second actuators 26 are disposed on both sides of the second oscillating axis BX in the radial direction (axial direction of the first oscillating axis AX). The second actuator 26 has a coil 44, a yoke 45, and a magnet 46.

[0048] The coil 44 is attached to the second movable part 32 and fixed to a coil attachment part 32b provided on the second movable part 32. The coils 44 are respectively provided at both ends of the second movable part 32 in the radial direction of the second oscillation axis BX (one side and the other side in the axial direction of the first oscillation axis AX). The yoke 45 is a member that forms a magnetic path. The yoke 45 is attached to the support part 27 and fixed relative to the support part 27. The yokes 45 are respectively arranged at both ends of the second movable part 32 corresponding to the coils 44. The magnets 46 are permanent magnets. The magnets 46 are attached to the yoke 45 and fixed relative to the yoke 45. The magnets 46 are arranged in positions adjacent to the respective coils 44.

[0049] A drive signal is input to the coil 44 from the drive circuit 16 (see FIG. 2). In the example shown in FIG. 4, a magnet 46 is attached to one side of a U-shaped yoke 45, and an air gap is formed between the unattached surface of the magnet 46 and the opposing U-shaped surface of the yoke 45. The coil 44 is disposed within the air gap. When a drive signal is input to the coil 44, a current flows through the coil 44, which is a conductor located within the air gap (magnetic field) formed by the magnet 46 and the yoke 45, and the coil 44 is subjected to an electromagnetic force. This electromagnetic force causes the second movable part 32 (second oscillating part 21B) fixed to the coil 44 to oscillate. In other words, the second actuator 26 can be said to be an electromagnetic actuator composed of the coil 44, the yoke 45, and the magnet 46.

[0050] In the optical path control mechanism 12, the first movable part 31 on which the optical member 20 is provided oscillates, and the second movable part 32 supporting the first movable part 31 oscillates as well. Therefore, it can be said that the optical member 20, the first movable part 31, the second movable part 32, and the coils 41 and 44 constitute the oscillating part 12A. In other words, it can be said that the part of the optical path control mechanism 12 that oscillates relative to the support part 27 corresponds to the oscillating part 12A. Note that the first shaft part 23A also oscillates together with the second movable part 32, and is therefore included in the oscillating part 12A. Furthermore, if a fixing member or adhesive for fixing the optical member 20 to the first movable part 31, or a substrate or lead wire for passing a current through the coils 41 and 44, is provided, these also oscillate relative to the support part 27 and are therefore included in the oscillating part 12A.

[0051] In the first embodiment, the first movable part 31 is oscillated by the first actuator 25, and the second movable part 32 is oscillated by the second actuator 26. In this case, the yokes 42 and 45 constituting the first actuator 25 and the second actuator 26 are fixed to the support part 27. Therefore, when the second movable part 32 is oscillated by the second actuator 26, a gap is secured between the first actuator 25 and the second movable part 32 so that they do not interfere with each other. Note that the first actuator 25 may be provided on the second movable part 32.

[0052] Although the first actuator 25 and the second actuator 26 are of a so-called moving coil type in which the coils 41 and 44 are arranged on the first movable part 31 and the second movable part 32, the present invention is not limited to this and may be of a so-called moving magnet type in which the magnets 43 and 46 are arranged on the first movable part 31 and the second movable part 32 and the coils 41 and 44 are arranged on the support part 27. In this case, the magnets 43 and 46 are swung together with the optical member 20, and therefore the magnets 43 and 46 are included in the swiveling part 12A instead of the coils 41 and 44.

[0053] The optical path control mechanism 12 has the above-described configuration, but is not limited to this and may have any configuration in which the optical part can shift the optical path of light L by oscillating the optical part using an actuator to which a drive signal is applied.

[0054] (First and second shafts) FIG. 6 is a perspective view of a swinging portion of the optical path control mechanism according to the first embodiment of the present disclosure.

[0055] As shown in Figure 6, the first movable part 31 constituting the first oscillating part 21A and the second movable part 32 constituting the second oscillating part 21B are connected by a first shaft part 23A along the first oscillating axis AX, and the second movable part 32 and the support part 27 are connected by a second shaft part 23B along the second oscillating axis BX.

[0056] (Image display processing) Next, a description will be given of image display processing by the video signal processing circuit 160 according to the first embodiment of the present disclosure. Fig. 7 is a schematic diagram illustrating image display according to the first embodiment.

[0057] The video signal processing circuit 160 divides one frame of the video signal into a red subframe R, a blue subframe B, a first green subframe G1, and a second green subframe G2. As shown in Fig. 7, for example, when a video signal having an 8K resolution (7680 x 4320) is displayed on a display element 106 having a 4K resolution (3840 x 2160), the video signal processing circuit 160 divides one frame of the video signal having the 8K resolution (7680 x 4320) into four subframes, each consisting of four pixels, into a red subframe R, a blue subframe B, a first green subframe G1, and a second green subframe G2. The resolution of the images in the divided subframes is 4K, which is one-fourth the resolution of 8K.

[0058] The red subframe R is a period during which red light LR is displayed (a red image is displayed), the blue subframe B is a period during which blue light LB is emitted (a blue image is displayed), and the first green subframe G1 and the second green subframe G2 are periods during which green light LG is displayed (a green image is displayed). That is, the video signal processing circuit 160 displays red light LR during a portion of one frame period of the video signal (the red subframe R), displays blue light LB during another portion of the period (the blue subframe B), displays green light LG during another portion of the period (the first green subframe G1), and displays green light LG during another portion of the period (the second green subframe G2).

[0059] 7, the video signal processing circuit 160 provides the display element 106 with a signal that causes the red subframe R, the first green subframe G1, the second green subframe G2, and the blue subframe B to be displayed for the same time interval (e.g., 1 / 240 seconds) during one frame of the video signal, but prevents the first green subframe G1 and the second green subframe G2 from being displayed consecutively. That is, the video signal processing circuit 160 performs control so that another subframe (red subframe R or blue subframe B) is present between the first green subframe G1 and the second green subframe G2. Note that in the example of FIG. 7, the display order of the subframes in one frame period is the first green subframe G1, the blue subframe B, the second green subframe G2, and the red subframe R, but any display order may be used in which the first green subframe G1 and the second green subframe G2 are not consecutive.

[0060] The video signal processing circuit 160 displays a first green subframe G1 (a green image displayed in the first green subframe G1) during a period in which the oscillating unit 12A faces a first direction, and displays a second green subframe G2 (a green image displayed in the second green subframe G2) during a period in which the oscillating unit 12A faces a second direction different from the first direction, thereby displaying the first green subframe G1 and the second green subframe G2 at positions that are point-symmetric with respect to a reference position. Because humans are highly sensitive to green, by not displaying consecutive green subframes and displaying green images at positions that are point-symmetric with respect to the reference position, as in this embodiment, it is possible to appropriately increase resolution with a simple configuration while suppressing color breakup.

[0061] Furthermore, in this embodiment, the video signal processing circuit 160 displays a blue subframe B (a blue image displayed in the blue subframe B) during a period in which the oscillating unit 12A faces a third direction different from the first and second directions, and displays a red subframe R (a red image displayed in the red subframe R) during a period in which the oscillating unit 12A faces a fourth direction different from the first, second, and third directions, thereby displaying the blue subframe B and the red subframe R at positions that are point-symmetrical with respect to the reference position and at positions different from the first green subframe G1 and the second green subframe G2. In this way, by displaying each subframe at a different position with respect to the reference position, it is possible to appropriately increase the resolution with a simple configuration while suppressing color breakup.

[0062] Specific control for displaying each subframe as described above will be described below.

[0063] (drive signal) The drive circuit 16 applies drive signals to the first actuator 25 and the second actuator 26 to oscillate the oscillating unit 12A. By applying drive signals such as those described below, the drive circuit 16 according to this embodiment causes the oscillating unit 12A to face in a first direction during a period in which the first green subframe G1 is displayed, in a third direction during a period in which the blue subframe B is displayed, in a second direction during a period in which the second green subframe G2 is displayed, and in a fourth direction during a period in which the red subframe R is displayed. Figure 8 is a graph illustrating the waveforms of the drive signals of the drive unit according to the first embodiment of the present disclosure.

[0064] As shown in FIG. 8, the drive signal applied from drive circuit 16 to first actuator 25 is an electric signal, and its current value changes over time. Hereinafter, the waveform representing the change in current value of the drive signal over time will be referred to as the drive signal waveform. The drive signal waveform is shown by a solid line in FIG. 8. The drive signal has the same waveform repeated every period T. Period T includes period T1 and period T2, which follows period T1 and is continuous with period T1. The length of period T may correspond to the length of one frame of the video signal; for example, if one frame of the video signal is 60 fps, it may be 1 / 60 seconds.

[0065] (Drive signal applied to the first actuator) As shown by the solid line in Figure 8, the current value of the drive signal applied to the first actuator 25 changes from a first current value A1 to a second current value A2 during a first period TA1 of the period T1. Here, the intermediate position 0 between the first current value A1 and the second current value A2 is the position where the current value is 0. During the first period TA1, the current value of the drive signal changes linearly over time from the first current value A1 to the second current value A2. That is, the current value of the drive signal applied to the first actuator 25 is the first current value A1 at the start of the first period TA1, and then changes linearly from the first current value A1 to reach the second current value A2 at the end of the first period TA1.

[0066] The first current value A1 is a current value that can maintain the first oscillation part 21A at the first angle D1 and is set according to the value of the first angle D1. The second current value A2 is a current value that can maintain the first oscillation part 21A at the second angle D2 and is set according to the value of the second angle D2. The first current value A1 and the second current value A2 are current values ​​that have opposite positive and negative signs, and their absolute values ​​may be equal. FIG. 8 illustrates an example in which the first current value A1 is negative and the second current value A2 is positive.

[0067] The length of the first period TA1 corresponds to the natural frequency of the first oscillator 21A. The first oscillator 21A refers to the portion of the optical path control mechanism 12 that oscillates relative to the support 27 (in the first embodiment, the optical member 20, the first movable portion 31, and the coil 41). That is, the length of the first period TA1 corresponds to the natural frequency of the portion that oscillates relative to the support 27. More specifically, the length of the first period TA1 is preferably approximately the same as the natural period of the first oscillator 21A, and more preferably the same as the natural period. Here, the natural period is the reciprocal of the natural frequency. Furthermore, "approximately the same value" means that a value that deviates from the natural period by a margin of error is acceptable. For example, a deviation from the natural period within 5% of the natural period may also be considered "approximately the same value." Hereinafter, the term "approximately the same value" will have the same meaning. The value of the natural vibration (the reciprocal of the natural frequency) is expressed as "1 / f" [s], where f [Hz] is the natural frequency.

[0068] The drive signal applied to the first actuator 25 is maintained at a second current value A2 during a second period TB1 of the period T1. The second period TB1 is a period following the first period TA1 and continuing therefrom. Increasing the natural frequency of the first oscillation part 21A is preferable because it shortens the first period TA1 and lengthens the second period TB1 (for example, makes the second period TB1 longer than the first period TA1). Maintaining the second current value A2 does not necessarily mean that the current value does not strictly change from the second current value A2, but may also mean that the current value deviates from the second current value A2 within a predetermined range. The predetermined value may be set arbitrarily, for example, to 10% of the second current value A2.

[0069] In this way, the drive signal applied to the first actuator 25 changes linearly over time from the first current value A1 to the second current value A2 during the period T1, and once the current value reaches the second current value A2, the current value is maintained at the second current value A2.

[0070] The current value of the drive signal applied to the first actuator 25 changes from the second current value A2 to the first current value A1 during a third period TA2 of the period T2. The third period TA2 is a period that follows the second period TB1 and is continuous with the second period TB1. More specifically, the current value of the drive signal changes linearly over time from the second current value A2 to the first current value A1 during the third period TA2. That is, the current value of the drive signal applied to the first actuator 25 is the second current value A2 at the start of the third period TA2, and then changes linearly from the second current value A2 to reach the first current value A1 at the end of the third period TA2.

[0071] The length of the third period TA2 corresponds to the natural frequency of the first oscillation part 21A. More specifically, the length of the third period TA2 is preferably approximately the same as the natural period (the reciprocal of the natural frequency) of the first oscillation part 21A, and more preferably the same as the natural period. The length of the third period TA2 is equal to the length of the first period TA1.

[0072] The drive signal applied to the first actuator 25 maintains the current value at the first current value A1 during a fourth period TB2 of the period T2. The fourth period TB2 is a period that follows the third period TA2 and is continuous with the third period TA2. The fourth period TB2 is a period that follows the first period TA1 and is continuous with the first period TA1. The length of the fourth period TB2 is equal to the second period TB1. Increasing the natural frequency of the first oscillation part 21A is preferable because it shortens the third period TA2 and lengthens the fourth period TB2 (for example, makes the fourth period TB2 longer than the third period TA2). Note that maintaining the current value at the first current value A1 does not necessarily mean that the current value does not strictly change from the first current value A1, but may also mean that the current value deviates from the first current value A1 within a predetermined range. The predetermined value may be set arbitrarily, for example, 10% of the first current value A1.

[0073] In this way, the drive signal applied to the first actuator 25 has a current value that changes linearly over time from the first current value A1 to the second current value A2 during the first period TA1, is maintained at the second current value A2 during the second period TB1, changes linearly over time from the second current value A2 to the first current value A1 during the third period TA2, and is maintained at the first current value A1 during the fourth period TB2.

[0074] As described above, in the first embodiment, the waveform of the drive signal is trapezoidal, and the first period TA1 and the third period TA2 in which the current value changes have values ​​that correspond to the natural frequency of the oscillating part 12A.

[0075] (Drive signal applied to the second actuator) The drive signal given from the drive circuit 16 to the second actuator 26 is similar to the drive signal given to the first actuator 25 shown by the solid line in Fig. 8, and therefore a description thereof will be omitted. As shown in Fig. 8, the drive signal given from the drive circuit 16 to the first actuator 25 and the drive signal given from the drive circuit 16 to the second actuator 26 may be out of phase with each other by ¼ of the period T. The difference is that the period during which the current value of the drive signal given to the second actuator 26 changes is a value corresponding to the natural frequency of the second oscillation part 21B.

[0076] (swing pattern) Next, the oscillation pattern of the first oscillation section 21A due to application of a drive signal will be described. Fig. 9 is a graph illustrating the oscillation pattern of the optical section according to the first embodiment of the present disclosure.

[0077] (Swing pattern of first swinging part) 9, the oscillation pattern of the first oscillation part 21A refers to the displacement angle (angle around the first oscillation axis AX) of the first oscillation part 21A per unit time when a drive signal is applied to the first actuator 25. In Fig. 9, the oscillation pattern is indicated by a solid line.

[0078] During the first period TA1, the current value of the drive signal changes from a first current value A1 to a second current value A2. As a result, the displacement angle of the first oscillation part 21A changes from a first angle D1 to a second angle D2 during the first period TA1. Here, the intermediate position 0 between the first angle D1 and the second angle D2 is the position where the displacement angle of the first oscillation part 21A is 0.

[0079] During the second period TB1, the current value of the drive signal is maintained at the second current value A2. As a result, the displacement angle of the first oscillation part 21A is maintained at the second angle D2 during the second period TB1. Note that "maintained at the second angle D2" does not necessarily mean that the displacement angle does not strictly change from the second angle D2, but may also mean that the displacement angle deviates from the second angle D2 within a predetermined range. The predetermined value here may be set arbitrarily, and may be, for example, 10% of the second angle D2.

[0080] In the third period TA2, the current value of the drive signal changes from the second current value A2 to the first current value A1, thereby causing the displacement angle of the first oscillation part 21A to change from the second angle D2 to the first angle D1 in the third period TA2.

[0081] During the fourth period TB2, the current value of the drive signal is maintained at the first current value A1. As a result, the displacement angle of the first oscillation part 21A is maintained at the first angle D1 during the fourth period TB2. Note that "maintained at the first angle D1" does not necessarily mean that the displacement angle does not strictly change from the first angle D1, but may also mean that the displacement angle deviates from the first angle D1 within a predetermined range. The predetermined value here may be set arbitrarily, and may be, for example, 10% of the first angle D1.

[0082] In the light path control device 10 that shifts the optical path by swinging the optical element 20, it is necessary to stably swing the optical element 20. In the first embodiment, by setting the lengths of the first period TA1 and the third period TA2 to values ​​corresponding to the natural frequency of the first swinging unit 21A, it is possible to suppress vibration of the first swinging unit 21A during the second period TB1 and the fourth period TB2, and to stably swing the first swinging unit 21A. In other words, by setting the lengths of the first period TA1 and the third period TA2 to values ​​corresponding to the natural frequency of the first swinging unit 21A, it is possible to suppress vibration of the first swinging unit 21A during the second period TB1 and the fourth period TB2, and to stably swing the first swinging unit 21A. Therefore, it is possible to swing the first swinging unit 21A at high speed and stably stop it, thereby suppressing image degradation.

[0083] (Swing pattern of second swinging part) 7 is applied from the drive circuit 16 to the second actuator 26, the oscillation pattern of the second oscillating part 21B is the same as the oscillation pattern of the first oscillating part 21A shown by the solid line in Fig. 8, and therefore will not be described here. As shown in Fig. 8, the oscillation pattern of the first oscillating part 21A and the oscillation pattern of the second oscillating part 21B are out of phase with each other by ¼ of the period T.

[0084] (Pixel operation by optical path control mechanism) Hereinafter, the operation when the first swinging part 21A and the second swinging part 21B are swung will be described. Fig. 10 is an explanatory diagram illustrating a two-axis swing pattern of the optical part according to the first embodiment of the present disclosure.

[0085] In the light path control mechanism 12 of the first embodiment, the first actuator 25 and the second actuator 26 constituting the actuator 12B swing the first swing unit 21A and the second swing unit 21B in response to respective drive signals so as to repeatedly change their posture about the first axis AX and the second axis BX from a first angle D1 to a second angle D2 and from the second angle D2 to the first angle D1. As the first swing unit 21A and the second swing unit 21B repeatedly swing between the first angle D1 and the second angle D2, the optical axis of the light L (the position where an image is displayed) repeatedly switches between a first position, a second position, a third position, and a fourth position. Here, the first position refers to the position of the optical axis when the oscillating part 12A faces the first direction (the position where the image is displayed), the second position refers to the position of the optical axis when the oscillating part 12A faces the second direction (the position where the image is displayed), the third position refers to the position of the optical axis when the oscillating part 12A faces the third direction (the position where the image is displayed), and the fourth position refers to the position of the optical axis when the oscillating part 12A faces the fourth direction (the position where the image is displayed).

[0086] The image projected onto the screen by the light L when the optical axis is at the first position is shifted by half a pixel from the image projected onto the screen by the light L when the optical axis is at the second position, and the image projected onto the screen by the light L when the optical axis is at the third position is shifted by half a pixel from the image projected onto the screen by the light L when the optical axis is at the fourth position. This increases the apparent number of pixels, thereby increasing the resolution of the image projected onto the screen. Because the shift amount of the optical axis is half a pixel of the image, the first angle D1 and the second angle D2 are set to angles that allow the image to be shifted by half a pixel. Note that the shift amount of the image is not limited to half a pixel and may be any amount, such as 1 / 4 or 1 / 8 of a pixel. The first angle D1 and the second angle D2 may also be set appropriately according to the shift amount of the image.

[0087] (Reference position) A specific description will be given below. Here, the first oscillation axis AX direction and the second oscillation axis BX direction intersect perpendicularly and are parallel to the pixel array direction. As shown in Fig. 10, the reference position P0 is the position (position of the optical axis) where an image is displayed when the current value applied to the first actuator 25 and the second actuator 26 is 0, that is, when the displacement angle of the optical member 20 is 0. In this embodiment, when at the reference position P0, no light is emitted and no image is displayed at the reference position P0.

[0088] (1st green subframe display at 1st position) 10 shows a state in which the first actuator 25 oscillates the optical element 20 around the first oscillation axis AX by a predetermined angle, shifting the optical axis (image display position) from the reference position P0 in the direction of the second oscillation axis BX by a quarter pixel, and the second actuator 26 oscillates the optical element 20 around the second oscillation axis BX by a predetermined angle, shifting the optical axis (image display position) from the reference position P0 in the direction of the first oscillation axis AX by a quarter pixel. In this embodiment, the A-operation state is a state in which the oscillation unit 12A faces the first direction; in other words, a state in which the position at which the image is displayed (the position of the optical axis) is at a first position PG1. The first position PG1 is a position shifted from the reference position P0 in one direction ABXa (first diagonal direction) in the ABX direction, which is a combination of a vector pointing in one direction in the direction of the first oscillation axis AX and a vector pointing in one direction in the direction of the second oscillation axis BX. In the example of FIG. 9, the operating state A may be the period in which the displacement angles of both the first and second oscillators are D2 (the first half of the period TB1).

[0089] In this embodiment, the video signal processing circuit 160 displays the first green sub-frame G1 (a green image) during a period in which the image display position is at the first position PG1, in other words, during a period in which the oscillating unit 12A faces the first direction (one side ABXa in this example). More specifically, the video signal processing circuit 160 displays the first green sub-frame G1 during a period in which the oscillating unit 12A faces the first direction and is stationary (during the first half of period TB1 in the example of FIG. 9), and does not display the first green sub-frame G1 during a period in which the oscillating unit 12A is oscillating (such as the first period TA1 in the example of FIG. 9).

[0090] Note that the period during which the image display position is at the first position PG1 is predetermined, and the video signal processing circuit 160 displays the first green sub-frame G1 during that predetermined period. For example, the drive circuit 16 and the video signal processing circuit 160 are synchronized by a clock signal, and control the drive signal so that the image display position is at the first position PG1 during the predetermined period, thereby displaying the first green sub-frame G1 during the predetermined period. This synchronization process is similar for the other sub-frame periods, and therefore further description will be omitted.

[0091] (Blue subframe displayed in third position) 10 is a state in which the optical axis (image display position) is at a third position PB, which is shifted in one direction ABXb (third diagonal direction) in the ABX direction, which is a combination of a vector pointing in one direction in the direction of the first oscillation axis AX and a vector pointing in one direction in the direction of the second oscillation axis BX, relative to the reference position P0. The B operating state can also be said to be a state in which the oscillation unit 12A faces the third direction. In the example of FIG. 9, the B operating state may be a period (the latter half of period TB1) in which the displacement angle of the first oscillation unit is D2 and the displacement angle of the second oscillation unit is D1.

[0092] In this embodiment, video signal processing circuit 160 displays blue sub-frame B (a blue image) while the image display position is at third position PB, in other words, while oscillating unit 12A faces the third direction (one side ABXb in this example). More specifically, video signal processing circuit 160 displays blue sub-frame B while oscillating unit 12A faces the third direction and is stationary.

[0093] (Display of second green subframe in second position) The C operating state shown in FIG. 10 is a state in which the optical axis (image display position) is at a second position PG2 shifted from the reference position P0 in one direction ABXc (a second diagonal direction opposite to the first diagonal direction) in the ABX direction, which is a combination of a vector pointing in one direction in the direction of the first oscillation axis AX and a vector pointing in one direction in the direction of the second oscillation axis BX. The second position PG2 is point-symmetrical with respect to the first position PG1, with reference position P0 as the reference. The C operating state can also be said to be a state in which the oscillation part 12A faces the second direction. In the example of FIG. 9, the C operating state may be the period in which the displacement angles of both the first oscillation part and the second oscillation part are D1 (the first half of period TB2).

[0094] In this embodiment, the video signal processing circuit 160 displays the second green sub-frame G2 (a green image) while the image display position is at the second position PG2, in other words, while the oscillating unit 12A faces the second direction (one side ABXc in this example). More specifically, the video signal processing circuit 160 displays the second green sub-frame G2 while the oscillating unit 12A faces the third direction and is stationary (during the first half of period TB2 in the example of FIG. 9), but does not display the second green sub-frame G2 while the oscillating unit 12A is oscillating (such as period TA2 in the example of FIG. 9).

[0095] (Red subframe display in 4th position) The D operating state shown in FIG. 10 is a state in which the optical axis (image display position) is at a fourth position PR shifted to one side ABXd in the ABX direction, which is a combination of a vector pointing in one direction in the direction of the first oscillation axis AX and a vector pointing in one direction in the direction of the second oscillation axis BX, relative to the reference position P0. The fourth position PR is point-symmetric with respect to the third position PB, with reference position P0 as the reference. The C operating state can also be said to be a state in which the oscillation part 12A faces a fourth direction. In the example of FIG. 9, the D operating state may be a period in which the displacement angle of the first oscillation part is D1 and the displacement angle of the second oscillation part is D2 (the latter half of period TB2).

[0096] In this embodiment, the video signal processing circuit 160 displays the red sub-frame R (red image) while the image display position is at the fourth position PR, in other words, while the oscillating part 12A faces the fourth direction (one side ABXd in this example). More specifically, the video signal processing circuit 160 displays the red sub-frame R while the oscillating part 12A faces the fourth direction and is stationary.

[0097] (effect) According to the configuration described above, by using a single-panel system to shift the pixels of the green image in the diagonal direction and by not displaying the green image continuously, it is possible to project a high-resolution image that is projected at low cost with less color breakup and higher than the resolution of the display element.

[0098] (Second embodiment) Next, a display device 1 according to a second embodiment of the present disclosure will be described. The display device 1 according to the second embodiment differs from the display device 1 according to the first embodiment in the configuration of the optical path control mechanism 12, the drive signal of the drive circuit 16, and the resulting oscillation pattern of the oscillation unit 12A. These will be described below.

[0099] (Optical path control mechanism) The configuration of the light path control mechanism 12 will be described. FIG. 11 is a schematic diagram of a light path control mechanism according to a second embodiment of the present disclosure. FIG. 12 is a cross-sectional view taken along line AA of the light path control mechanism according to the second embodiment of the present disclosure. As shown in FIGS. 11 and 12, the light path control mechanism 12 has an oscillating unit 12A including an optical member 20 onto which light L is incident, and an actuator 12B that oscillates the oscillating unit 12A. More specifically, the light path control mechanism 12 has the optical member 20, a movable unit 22, a shaft unit 23, a support unit 24, a yoke 271, a magnet 28, and a coil 29.

[0100] The optical member 20 is a member that transmits incident light L. The light L is incident on one surface of the optical member 20, the optical member 20 transmits the incident light L, and the light L is emitted from the other surface. In this embodiment, the optical member 20 is a glass plate, but the material and shape of the optical member 20 may be any desired one.

[0101] The movable part 22 is a member that supports the optical element 20. The movable part 22 is fixed to the optical element 20. Specifically, the movable part 22 in this embodiment is a plate-shaped member with a through-hole formed in the center. The optical element 20 is fixed to the movable part 22 in a state where it is fitted into the through-hole of the movable part 22. Note that the optical element 20 is fixed to the movable part 22 via a fixing member or adhesive for fixing it to the movable part 22, but the method of fixing the optical element 20 to the movable part 22 may be arbitrary.

[0102] The support part 24 is a member that swingably supports the movable part 22 on which the optical element 20 is provided. In this embodiment, the support part 24 is a frame-shaped member that is provided so as to surround the outer periphery of the movable part 22. The shaft part 23 is a member that swingably connects the movable part 22 to the support part 24. In the second embodiment, two shaft parts 23 are provided. The shaft parts 23 are provided at positions near vertices that face each other of the rectangular optical element 20. The movable part 22 swings around the swing axis AX, which is an axis connecting the shaft parts 23. When the movable part 22 swings around the swing axis AX, the posture of the optical element 20 provided on the movable part 22 changes, and the optical path of the light L that passes through the optical element 20 is shifted.

[0103] The coils 29 are attached to the movable part 22 and fixed relative to the movable part 22. The coils 29 are provided at both ends of the movable part 22. The yokes 271 are members that form a magnetic path. The yokes 271 are attached to the support part 24 and fixed relative to the support part 24. The yokes 271 are provided at both ends of the movable part 22 corresponding to the coils 29. The magnets 28 are permanent magnets. The magnets 28 are attached to the yokes 271 and fixed relative to the yokes 271. The magnets 28 are disposed adjacent to the respective coils 29. A drive signal is input to the coils 29 from the drive circuit 16. In the example of FIG. 12 , the magnets 28 are bonded to one side of the U-shaped yoke 271, and an air gap is formed between the unbonded surface of the magnet 28 and the opposing side of the U-shaped yoke 271. The coils 29 are disposed within this air gap. A drive signal is input to the coils 29. As a result, a current flows through coil 29, which is a conductor located within the magnetic field of magnet 28, generating a force that causes movable part 22 (oscillating part 12A) fixed to coil 29 to oscillate. In other words, actuator 12B according to this embodiment can be said to be an electromagnetic actuator composed of coil 29, yoke 271, and magnet 28.

[0104] In this embodiment, the movable part 22 provided with the optical element 20 oscillates in this manner, and therefore the optical element 20, the movable part 22, and the coil 29 can be said to constitute the oscillating part 12A. In other words, the part of the optical path control mechanism 12 that oscillates relative to the support part 24 can be said to refer to the oscillating part 12A. Note that, if a fixing member or adhesive for fixing the optical element 20 to the movable part 22, or a substrate or lead wire for passing a current through the coil 29, is provided, these also oscillate relative to the support part 24 and are therefore included in the oscillating part 12A.

[0105] The actuator of this embodiment is a so-called moving coil type in which the coil 29 is arranged in the movable part 22, but is not limited to this and may be, for example, a so-called moving magnet type in which the magnet 28 is arranged in the movable part 22 and the coil 29 is arranged in the support part 24. In this case, the magnet 28 is swung together with the optical member 20, and therefore the magnet 28 is included in the swiveling part 12A instead of the coil 29.

[0106] The optical path control mechanism 12 has the above-described configuration, but is not limited to this and may have any configuration in which the optical part can shift the optical path of light L by oscillating the optical part using an actuator to which a drive signal is applied.

[0107] (Image display processing) Next, a description will be given of image display processing by the video signal processing circuit 160 according to the second embodiment. Fig. 13A is a schematic diagram illustrating image display according to the second embodiment of the present disclosure.

[0108] As in the first embodiment, the video signal processing circuit 160 of the second embodiment displays a first green sub-frame G1 (green image) during a period when the oscillating portion 12A faces a first direction, and displays a second green sub-frame G2 (green image) during a period when the oscillating portion 12A faces a second direction different from the first direction, thereby displaying the first green sub-frame G1 and the second green sub-frame G2 at positions that are point-symmetric to each other with respect to a reference position.

[0109] Furthermore, in this embodiment, the video signal processing circuit 160 displays a blue subframe B (a blue image) and a red subframe R (a red image) during the period when the oscillating portion 12A is facing a third direction between the first direction and the second direction, thereby displaying the blue subframe B and the red subframe R at the reference position P0.

[0110] Specific control for displaying each subframe as described above will be described below.

[0111] (drive signal) The drive circuit 16 applies a drive signal to the actuator 12B to cause the oscillating unit 12A to oscillate. By applying a drive signal such as that described below, the drive circuit 16 according to the present embodiment causes the oscillating unit 12A to face in the first direction during the period in which the first green subframe G1 is displayed, in the third direction during the period in which the blue subframe B is displayed, in the second direction during the period in which the second green subframe G2 is displayed, and in the third direction during the period in which the red subframe R is displayed. Figure 13B is a graph illustrating the waveform of a drive signal of a drive unit according to the second embodiment of the present disclosure.

[0112] As shown in FIG. 13B, the drive signal applied from the drive circuit 16 to the actuator 12B is an electrical signal, and its current value changes over time. Hereinafter, the waveform representing the change in the current value of the drive signal over time will be referred to as the drive signal waveform. The drive signal waveform is shown by a solid line in FIG. 13B. The drive signal has the same waveform repeated every period T. Period T includes a period T1 and a period T2 that follows and continues after period T1. Period T1 includes a first period TA1, a second period TB1, a third period TC1, and a fourth period TD1. The lengths of these periods may be set arbitrarily, for example, by dividing period T1 into four equal parts. Period T2 includes a fifth period TA2, a sixth period TB2, a seventh period TC2, and an eighth period TD2. The lengths of these periods may be set arbitrarily, for example, by dividing period T2 into four equal parts. Furthermore, the length of the period T may correspond to the length of one frame of the video signal, and may be 1 / 60 seconds if one frame of the video signal is 60 fps, for example.

[0113] At the start of a first period TA1 of the period T1, the current value of the drive signal changes stepwise from 0 to half the second current value A2, and then, during a third period TC1, the current value is maintained at half the second current value A2.

[0114] At the start of a second period TB1 following the first period TA1, the current value of the drive signal changes stepwise from half the second current value A2 to the second current value, and then remains at the second current value A2 during the second period TB1.

[0115] The first current value A1 is a current value that can maintain the oscillation part 12A at the first angle D1 and is set according to the value of the first angle D1. The second current value A2 is a current value that can maintain the oscillation part 12A at the second angle D2 and is set according to the value of the second angle D2. The first current value A1 and the second current value A2 are current values ​​that have opposite positive and negative signs, and their absolute values ​​may be equal. FIG. 13B illustrates an example in which the first current value A1 is negative and the second current value A2 is positive.

[0116] The drive signal has a current value maintained at a second current value A2 during a second period TB1 of period T1. The second period TB1 is a period following the first period TA1 and continuing therefrom. Note that maintaining the current value at the second current value A2 does not necessarily mean that the current value does not strictly change from the second current value A2, but may also mean that the current value deviates from the second current value A2 within a predetermined range. The predetermined value may be set arbitrarily, and may be, for example, 10% of the second current value A2.

[0117] Next, at the start of a third period TC1 of period T1, the current value of the drive signal changes from the second current value A2 to half the second current value A2. That is, at the start of the third period TC1, the current value of the drive signal changes in a stepwise manner from the second current value A2 to half the second current value A2. Thereafter, during the third period TC1, the current value is maintained at half the second current value A2. Note that the term "maintained at half the second current value A2" has the same meaning as the term "maintained at the second current value A2" described above.

[0118] Next, at the start of a fourth period TD1 of period T1, the current value of the drive signal changes from half the second current value A2 to 0. That is, at the start of the fourth period TC1, the current value of the drive signal changes stepwise from half the second current value A2 to 0. Thereafter, the current value is maintained at 0 during the fourth period TC1. Note that the meaning of "maintaining the current value at 0" is the same as the meaning of "maintaining the current value at the second current value A2" described above.

[0119] Next, at the start of a fifth period TA2 of period T2, the current value of the drive signal changes from 0 to half the first current value A1. That is, at the start of the fifth period TA2, the current value of the drive signal changes stepwise from 0 to half the first current value A1. Thereafter, during the fifth period TA2, the current value is maintained at half the first current value A1. Note that "maintained at half the first current value A1" has the same meaning as "maintained at the second current value A2" described above.

[0120] Next, at the start of a sixth period TB2 of period T2, the current value of the drive signal changes from half the first current value A1 to the first current value A1. That is, at the start of the sixth period TB2, the current value of the drive signal changes stepwise from half the first current value A1 to the first current value A1. Thereafter, during the sixth period TB2, the current value is maintained at the first current value A1. Note that the term "maintained at the first current value A1" has the same meaning as the term "maintained at the second current value A2" described above.

[0121] Next, at the start of a seventh period TC2 of period T2, the current value of the drive signal changes from the first current value A1 to half the first current value A1. That is, at the start of the seventh period TC2, the current value of the drive signal changes stepwise from the first current value A1 to half the first current value A1. Thereafter, during the seventh period TC2, the current value is maintained at half the first current value A1. Note that the term "maintained at half the first current value A1" has the same meaning as the term "maintained at the second current value A2" described above.

[0122] Next, at the start of an eighth period TD2 of period T2, the current value of the drive signal changes from half the first current value A1 to 0. That is, at the start of the eighth period TD2, the current value of the drive signal changes stepwise from half the first current value A1 to 0. Thereafter, the current value is held at 0 during the eighth period TD2. Note that the meaning of "holding the current value at 0" is the same as the meaning of "holding the current value at the second current value A2" described above.

[0123] In this way, the drive signal changes the current value from 0 to half the second current value A2 in the first period TA1 and then maintains it at half the second current value A2, changes the current value from half the second current value A2 to the second current value A2 in the second period TB1 and then maintains it at the second current value A2, changes the current value from half the second current value A2 to half the second current value A2 in the third period TC1 and then maintains it at half the second current value A2, and changes the current value from half the second current value A2 to 0 in the fourth period TD1 and then maintains it at 0. In a fifth period TA2, the current value is changed from 0 to half the first current value A1 and then maintained at half the first current value A1; in a sixth period TB2, the current value is changed from half the first current value A1 to the first current value A1 and then maintained at the first current value A1; in a seventh period TC2, the current value is changed from the first current value A1 to half the first current value A1 and then maintained at half the first current value A1; and in an eighth period TD2, the current value is changed from half the first current value A1 to 0 and then maintained at 0.

[0124] (swing pattern) Next, the oscillation pattern of the oscillating unit 12A due to application of a drive signal will be described. Fig. 14 is a graph illustrating the oscillation pattern of the optical unit according to the second embodiment of the present disclosure. The oscillation pattern of the oscillating unit 12A refers to the displacement angle (angle around the oscillation axis AX) of the oscillating unit 12A per time when a drive signal is applied to the actuator 12B. In Fig. 14, the oscillation pattern is indicated by a solid line.

[0125] In the first period TA1, the current value of the drive signal changes from 0 to half the second current value A2, and then is maintained at half the second current value A2, causing the displacement angle of the oscillating part 12A to change from 0 to the second angle D2 in the first period TA1.

[0126] During the second period TB1, the current value of the drive signal changes from half the second current value A2 to the second current value A2, and then is maintained at the second current value A2, so that the displacement angle of the oscillating part 12A is maintained at the second angle D2 during the second period TB1.

[0127] During the third period TC1, the current value of the drive signal changes from the second current value A2 to half the second current value A2, and then is maintained at half the second current value A2. As a result, the displacement angle of the oscillating part 12A changes from the second angle D2 to 0 during the third period TC1.

[0128] In the fourth period TD1, the current value of the drive signal changes from half the second current value A2 to 0, and then is held at 0. As a result, the displacement angle of the oscillating part 12A is held at 0 in the fourth period TD1.

[0129] In the fifth period TA2, the current value of the drive signal changes from 0 to half the first current value A1, and then is maintained at half the first current value A1, causing the displacement angle of the oscillating part 12A to change from 0 to the first angle D1 in the fifth period TA2.

[0130] During the sixth period TB2, the current value of the drive signal changes from half the first current value A1 to the first current value A1, and then is maintained at the first current value A1, so that the displacement angle of the oscillating part 12A is maintained at the first angle D1 during the sixth period TB2.

[0131] During the seventh period TC2, the current value of the drive signal changes from the first current value A1 to half the first current value A1, and then is maintained at half the first current value A1. As a result, the displacement angle of the oscillating part 12A changes from the first angle D1 to 0 during the seventh period TC2.

[0132] In the eighth period TD2, the current value of the drive signal changes from half the first current value A1 to 0, and then is held at 0. As a result, the displacement angle of the oscillating part 12A is held at 0 in the eighth period TD2.

[0133] In this way, the swinging portion 12A repeatedly changes its posture from the first angle D1 to the second angle D2 in response to the drive signal given to the actuator 12B from the drive circuit.

[0134] (Pixel operation by optical path control mechanism) The operation of the pixel when the oscillating section 12A is oscillated will be described below. Fig. 15 is an explanatory diagram illustrating a uniaxial oscillation pattern of the optical section according to the second embodiment of the present disclosure.

[0135] In the light path control mechanism 12 of the second embodiment, the actuator 12B swings the swinging unit 12A in response to a drive signal so as to repeatedly change its posture around the first axis AX from a first angle D1 to a second angle D2. As the swinging unit 12A repeatedly swings between the first angle D1 and the second angle D2, the optical axis of the light L (the position where an image is displayed) repeatedly switches between the first position, the second position, and the reference position.

[0136] 15, the reference position P0 is the position (position of the optical axis) at which an image is displayed when the current value applied to the actuator 12B is 0, that is, when the displacement angle of the optical member 20 is 0.

[0137] (1st green subframe display at 1st position) The A-operation state shown in FIG. 15 is a state in which the actuator 12B oscillates the optical element 20 to one side about the oscillation axis AX by a predetermined angle, thereby shifting the optical axis (image display position) from the reference position P0 by 1 / 4 pixel to one side in a direction perpendicular to the oscillation axis AX. In this embodiment, the A-operation state is a state in which the oscillation unit 12A faces a first direction; in other words, a state in which the position at which the image is displayed (the position of the optical axis) is at a first position PG1. The first position PG1 is a position shifted from the reference position P0 in the direction of a vector (first diagonal direction) pointing to one side in a direction perpendicular to the oscillation axis AX. In the example of FIG. 14, the A-operation state may be a period (period TB1) in which the displacement angle of the oscillation unit is D2.

[0138] In this embodiment, the video signal processing circuit 160 displays the first green sub-frame G1 (a green image) while the image display position is at the first position PG1, in other words, while the oscillating unit 12A faces the first direction. More specifically, the video signal processing circuit 160 displays the first green sub-frame G1 while the oscillating unit 12A faces the first direction and is stationary (during period TB1 in the example of FIG. 14), but does not display the first green sub-frame G1 while the oscillating unit 12A is oscillating (such as during period TA1 in the example of FIG. 14).

[0139] (Blue subframe displayed at reference position) 15 is a state in which the position where the image is displayed (the position of the optical axis) is at the reference position P0. The B operating state can also be said to be a state in which the oscillating unit 12A faces the third direction. In the example of FIG. 14, the B operating state may be the period (period TD1) in which the displacement angle of the oscillating unit is 0.

[0140] In this embodiment, video signal processing circuit 160 displays blue sub-frame B (blue image) during a period when the image display position is at reference position P0 immediately after first position PG1, in other words, during a period when oscillating unit 12A faces the third direction. More specifically, video signal processing circuit 160 displays blue sub-frame B during a period when oscillating unit 12A faces the third direction and is stationary.

[0141] (Display of second green subframe in second position) The C operating state shown in FIG. 15 is a state in which the optical axis (image display position) is at a second position PG2, which is shifted from the reference position P0 to the other side in the direction perpendicular to the oscillation axis AX (a second diagonal direction opposite to the first diagonal direction). The second position PG2 is point-symmetric with respect to the first position PG1, with the reference position P0 as the reference. The C operating state can also be said to be a state in which the oscillation unit 12A faces the second direction. In the example of FIG. 14, the C operating state may be the period (period TB2) in which the displacement angle of the oscillation unit is D1.

[0142] In this embodiment, the video signal processing circuit 160 displays the second green sub-frame G2 (a green image) while the image display position is at the second position PG2, in other words, while the oscillating unit 12A faces the second direction. More specifically, the video signal processing circuit 160 displays the second green sub-frame G2 while the oscillating unit 12A faces the second direction and is stationary (during period TB2 in the example of FIG. 14), but does not display the second green sub-frame G2 while the oscillating unit 12A is oscillating (such as during period TA2 in the example of FIG. 14).

[0143] (Red subframe displayed at reference position) The D operating state shown in Fig. 15 is a state in which the position where the image is displayed (the position of the optical axis) is at the reference position P0. The D operating state can also be said to be a state in which the oscillating part 12A faces the third direction. In the example of Fig. 14, the D operating state may be the period (period TD2) in which the displacement angle of the oscillating part is 0.

[0144] In this embodiment, the video signal processing circuit 160 displays the red sub-frame R (red image) during a period when the image display position is at the reference position P0 immediately after the second position PG2, in other words, during a period when the oscillating unit 12A faces the third direction. More specifically, the video signal processing circuit 160 displays the red sub-frame R (red image) immediately after the first position PG1 during a period when the oscillating unit 12A faces the third direction and is stationary.

[0145] (effect) According to the configuration described above, by using a single-plate method to shift the pixels of a green image in a diagonal direction and not displaying the green image continuously, it is possible to inexpensively project an image with less color breakup and with a higher resolution than the resolution of the display element 106. Furthermore, by displaying a red image and a blue image in the same position, it is possible to display an image with less color shift, and since a one-axis swing type light path control device 10 can be used, a system can be constructed more inexpensively.

[0146] (Third embodiment) Next, a display device 1 according to a third embodiment of the present disclosure will be described. The display device 1 according to the third embodiment differs from the display device 1 according to the second embodiment in the drive signal of the drive circuit and the resulting oscillation operation of the oscillation unit 12A. These will be described below.

[0147] (Image display processing) FIG. 16A is a schematic diagram illustrating an image display according to the third embodiment.

[0148] As in the first embodiment, the video signal processing circuit 160 of the third embodiment displays a first green sub-frame G1 (green image) during a period when the oscillating portion 12A faces a first direction, and displays a second green sub-frame G2 (green image) during a period when the oscillating portion 12A faces a second direction different from the first direction, thereby displaying the first green sub-frame G1 and the second green sub-frame G2 at positions that are point-symmetric to each other with respect to a reference position.

[0149] Furthermore, in this embodiment, the video signal processing circuit 160 displays either a blue subframe B (a blue image) or a red subframe R (a red image) during a period in which the oscillating unit 12A faces the first direction, thereby displaying either the blue subframe B or the red subframe R and the first green subframe G1 at the same position relative to the reference position P0. Furthermore, the video signal processing circuit 160 displays the other of the blue subframe B or the red subframe R during a period in which the oscillating unit 12A faces the second direction, thereby displaying the other of the blue subframe B or the red subframe R and the second green subframe G2 at the same position relative to the reference position P0. In the following description, the blue subframe B is displayed during a period in which the oscillating unit 12A faces the first direction, and the red subframe R is displayed during a period in which the oscillating unit 12A faces the second direction. However, the present invention is not limited to this, and the red sub-frame R may be displayed during the period when the oscillating portion 12A faces the first direction, and the blue sub-frame B may be displayed during the period when the oscillating portion 12A faces the second direction.

[0150] Specific control for displaying each subframe as described above will be described below.

[0151] (drive signal) The drive circuit 16 according to the present embodiment applies drive signals, such as those described below, to the oscillating unit 12A to face in a first direction during the period in which the first green subframe G1 is displayed, to face in a second direction during the period in which the second green subframe G2 is displayed, to face in the first direction during the period in which the blue subframe B is displayed, and to face in the second direction during the period in which the red subframe R is displayed. Fig. 16B is a graph illustrating the waveform of a drive signal of the drive unit according to the third embodiment of the present disclosure.

[0152] As shown in FIG. 16B, the drive signal applied from drive circuit 16 to actuator 12B is an electrical signal whose current value changes over time. Hereinafter, a waveform representing the change in current value of the drive signal over time will be referred to as the drive signal waveform. The drive signal waveform is shown by a solid line in FIG. 16B. The drive signal has the same waveform repeated every period T. Period T includes period T1 and period T2, which follows period T1 and is continuous with period T1. The length of period T may correspond to the length of one frame of the video signal; for example, if one frame of the video signal is 60 fps, it may be 1 / 60 seconds.

[0153] During a first period TA1 of the period T1, the drive signal has a current value maintained at the second current value A2. As described above, maintaining the current value at the second current value A2 does not necessarily mean that the current value does not change strictly from the second current value A2, but may also mean that the current value deviates from the second current value A2 within a predetermined range. The predetermined value may be set arbitrarily, and may be, for example, 10% of the second current value A2.

[0154] During a second period TB1 of period T1, the current value of the drive signal changes from the second current value A2 to the first current value A1, and then is maintained at the first current value A1. That is, the drive signal gradually changes from the second current value A2 to the first current value A1 during a period corresponding to the natural frequency from the start timing of the second period TB1. Thereafter, the drive signal is maintained at the first current value A1 for the remainder of the second period TB1. Note that the meaning of "maintained at the first current value A1" is the same as the meaning of "maintained at the second current value A2" described above.

[0155] The current value of the drive signal is maintained at the first current value A1 during a third period TA2 of the period T2.

[0156] During a fourth period TB2 of period T2, the current value of the drive signal changes from the first current value A1 to the second current value A2, and then is maintained at the second current value A2. That is, the drive signal gradually changes from the first current value A1 to the second current value A2 during an arbitrary period from the start timing of the fourth period TB2. Thereafter, the drive signal is maintained at the second current value A2 for the remainder of the fourth period TB2.

[0157] In this way, the drive signal is held at the second current value in the first period, changed from the second current value to the first current value in the second period and then held at the first current value, held at the first current value in the third period, and changed from the first current value to the second current value in the fourth period and then held at the second current value.

[0158] (swing pattern) Next, the oscillation pattern of the oscillation unit 21 due to application of a drive signal will be described. Fig. 17 is a graph illustrating the oscillation pattern of the optical unit according to the third embodiment of the present disclosure.

[0159] During the first period TA1, the current value of the drive signal is maintained at the second current value A2, so that the displacement angle of the oscillating part 12A is maintained at the second angle D2 during the first period TA1.

[0160] During the second period TB1, the current value of the drive signal changes from the second current value A2 to the first current value A1, and then is maintained at the first current value A1. As a result, during the second period TB1, the displacement angle of the oscillating part 12A changes from the second angle D2 to the first angle D1, and then is maintained at the first angle D1.

[0161] During the third period TA2, the current value of the drive signal is maintained at the first current value A1, so that the displacement angle of the oscillating part 12A is maintained at the first angle D1 during the third period TA2.

[0162] During the fourth period TB2, the current value of the drive signal changes from the first current value A1 to the second current value A2, and is then maintained at the second current value A2. As a result, during the fourth period TB2, the displacement angle of the oscillating part 12A changes from the second angle D2 to the first angle D1, and is then maintained at the first angle D1.

[0163] In this way, the swinging portion 12A repeatedly changes its posture from the first angle D1 to the second angle D2 in response to the drive signal given to the actuator 12B from the drive circuit.

[0164] (Pixel operation by optical path control mechanism) Hereinafter, a description will be given of the operation of the pixel when the oscillation unit 12A is oscillated in the light path control mechanism 12 of the third embodiment. Fig. 18 is an explanatory diagram illustrating a uniaxial oscillation pattern of the optical unit according to the third embodiment of the present disclosure.

[0165] In the light path control mechanism 12 of the third embodiment, the actuator 12B swings the swinging unit 12A in response to a drive signal so as to repeatedly change its posture around the first axis AX from a first angle D1 to a second angle D2. As the swinging unit 12A repeatedly swings between the first angle D1 and the second angle D2, the optical axis of the light L (the position where an image is displayed) repeatedly switches between the first position and the second position.

[0166] A specific description will be given below. The reference position P0 is the position (position of the optical axis) where an image is displayed when the current value applied to the actuator 12B is 0, that is, when the displacement angle of the optical member 20 is 0.

[0167] (1st green subframe display at 1st position) The A-operation state shown in FIG. 18 is a state in which the actuator 12B oscillates the optical element 20 to one side about the oscillation axis AX by a predetermined angle, thereby shifting the optical axis (image display position) from the reference position P0 by 1 / 4 pixel to one side in a direction perpendicular to the oscillation axis AX. In this embodiment, the A-operation state is a state in which the oscillation unit 12A faces a first direction; in other words, a state in which the position at which the image is displayed (position of the optical axis) is at a first position PG1. The first position PG1 is a position shifted from the reference position P0 in the direction of a vector (first diagonal direction) pointing to one side in a direction perpendicular to the oscillation axis AX. In the example of FIG. 17, the A-operation state may be a period (period TB2) in which the displacement angle of the oscillation unit is D2.

[0168] In this embodiment, the video signal processing circuit 160 displays the first green sub-frame G1 (a green image) during a period in which the image display position is at the first position PG1, in other words, during a period in which the oscillating unit 12A faces the first direction. More specifically, the video signal processing circuit 160 displays the first green sub-frame G1 during a period in which the oscillating unit 12A faces the first direction and is stationary (during the latter half of period TB2 in the example of FIG. 17), and does not display the first green sub-frame G1 during a period in which the oscillating unit 12A is oscillating (such as the first half of period TB2 in the example of FIG. 17).

[0169] (Blue subframe displayed in first position) 18 is a state in which the position where an image is displayed (the position of the optical axis) is at the first position PG1. The B operating state can also be said to be a state in which the oscillating part 12A faces the first direction. In the example of FIG. 17, the B operating state may be the period (period TA1) in which the displacement angle of the oscillating part is D2.

[0170] In this embodiment, video signal processing circuit 160 displays blue subframe B (a blue image) during a period when the image display position is at first position PG1 immediately after first green subframe G1, in other words, during a period when oscillating unit 12A faces the first direction. More specifically, video signal processing circuit 160 displays blue subframe B during a period when oscillating unit 12A faces the first direction and is stationary.

[0171] (Display of second green subframe in second position) The C operating state shown in FIG. 18 is a state in which the actuator 12B swings the optical element 20 to the other side around the swing axis AX by a predetermined angle, and the optical axis (image display position) is shifted by 1 / 4 pixel to the other side in the direction perpendicular to the swing axis AX with respect to the reference position P0. In this embodiment, the C operating state is a state in which the swing unit 12A faces the second direction; in other words, a state in which the position where the image is displayed (position of the optical axis) is at the second position PG2. The second position PG2 is point-symmetric with respect to the first position PG1, with respect to the reference position P0. In the example of FIG. 17, the C operating state may be the period (period TB1) in which the swing unit's displacement angle is D1.

[0172] In this embodiment, the video signal processing circuit 160 displays the second green sub-frame G2 (a green image) while the image display position is at the second position PG2, in other words, while the oscillating unit 12A faces the second direction. More specifically, the video signal processing circuit 160 displays the second green sub-frame G2 while the oscillating unit 12A faces the second direction and is stationary (during the latter half of period TB1 in the example of FIG. 17), but does not display the second green sub-frame G2 while the oscillating unit 12A is oscillating (such as the first half of period TB1 in the example of FIG. 17).

[0173] (Red subframe display in second position) 18 is a state in which the position where the image is displayed (the position of the optical axis) is at the second position PG2. The D operating state can also be said to be a state in which the oscillating part 12A faces the second direction. In the example of FIG. 17, the D operating state may be the period (period TA2) in which the displacement angle of the oscillating part is D1.

[0174] In this embodiment, the video signal processing circuit 160 displays the red sub-frame R (red image) during the period when the image display position is at the second position PG2 immediately after the second green sub-frame G2, in other words, during the period when the oscillating unit 12A faces the second direction. More specifically, the video signal processing circuit 160 displays the red sub-frame R during the period when the oscillating unit 12A faces the second direction and is stationary.

[0175] (effect) According to the configuration described above, by using a single-panel system to shift the green sub-frames diagonally and not displaying consecutive green sub-frames, it is possible to reduce color breakup and increase the resolution of the projected image beyond the resolution of the display element 106 at low cost. Furthermore, because the first green sub-frame G1 and the second green sub-frame G2 are displayed while the optical path control mechanism 12 is stopped, it is possible to display an image with less blurring.

[0176] (Fourth embodiment) Next, a display device 1 according to a fourth embodiment of the present disclosure will be described. The display device 1 according to the fourth embodiment differs from the display device 1 according to the second embodiment in the processing of the video signal processing circuit 160, the drive signal of the drive circuit 16, and the resulting swing operation of the swinging portion 12A. These will be described below.

[0177] (Image display processing) FIG. 19A is a schematic diagram illustrating an image display according to the fourth embodiment.

[0178] As in the first embodiment, the video signal processing circuit 160 of the fourth embodiment displays a first green sub-frame G1 (green image) during a period when the oscillating portion 12A faces a first direction, and displays a second green sub-frame G2 (green image) during a period when the oscillating portion 12A faces a second direction different from the first direction, thereby displaying the first green sub-frame G1 and the second green sub-frame G2 at positions that are point-symmetric to each other with respect to a reference position.

[0179] Furthermore, in this embodiment, the video signal processing circuit 160 displays the blue subframe B (blue image) and the red subframe R (red image) during the period when the oscillating unit 12A faces the first direction, thereby displaying the blue subframe B, the red subframe R, and the first green subframe G1 at the same position relative to the reference position P0. However, this is not limiting, and the video signal processing circuit 160 may display the blue subframe B, the red subframe R, and the second green subframe G2 at the same position relative to the reference position P0 by displaying the blue subframe B and the red subframe R during the period when the oscillating unit 12A faces the second direction.

[0180] Specific control for displaying each subframe as described above will be described below.

[0181] (drive signal) The drive circuit 16 according to the present embodiment applies a drive signal, for example, as described below, to the oscillation unit 12A to orient it in a first direction during the periods when the red subframe R, the first green subframe G1, and the blue subframe B are displayed, and to orient it in a second direction during the period when the second green subframe G2 is displayed. Fig. 19B is a graph illustrating the waveform of the drive signal of the drive unit according to the fourth embodiment of the present disclosure.

[0182] As shown in FIG. 19B, the drive signal applied from drive circuit 16 to actuator 12B is an electrical signal whose current value changes over time. Hereinafter, a waveform representing the change in current value of the drive signal over time will be referred to as the drive signal waveform. The drive signal waveform is shown by a solid line in FIG. 19B. The drive signal has the same waveform repeated every period T. Period T includes period T1 and period T2, which follows period T1 and is continuous with period T1. The length of period T may correspond to the length of one frame of the video signal; for example, if one frame of the video signal is 60 fps, it may be 1 / 60 seconds.

[0183] During a first period TA1 of the period T1, the current value of the drive signal changes from a first current value A1 to a second current value A2, and then is maintained at the second current value A2. As described above, maintaining the current value at the second current value A2 does not necessarily mean that the current value does not change strictly from the second current value A2, but may also mean that the current value deviates from the second current value A2 within a predetermined range. The predetermined value here may be set arbitrarily, and may be, for example, 10% of the second current value A2.

[0184] The current value of the drive signal is maintained at the second current value A2 during a second period TB1 of the period T1.

[0185] During a third period TA2 of the period T2, the drive signal current value is maintained at the second current value A2 for a predetermined period, and then changes from the second current value A2 to the first current value A1. Note that this predetermined period may be set arbitrarily within the range of the third period TA2, and may be, for example, half the third period TA2.

[0186] The current value of the drive signal is maintained at the first current value A1 during a fourth period TB2 of the period T2.

[0187] In this way, the drive signal changes from the first current value to the second current in a first period, then holds the drive signal at the second current value in a second period, changes from the second current value to the first current value in a third period, then holds the drive signal at the first current value, and then holds the drive signal at the first current value in a fourth period.

[0188] (swing pattern) Next, a description will be given of the oscillation pattern of the oscillation unit 21 due to application of a drive signal. Fig. 20 is a graph illustrating the oscillation pattern of the optical unit according to the fourth embodiment of the present disclosure.

[0189] During the first period TA1, the current value of the drive signal changes from a first current value A1 to a second current value A2, and then is maintained at the second current value A2. As a result, during the first period TA1, the displacement angle of the oscillating part 21 changes from a first angle D1 to a second angle D2, and then is maintained at the second angle D2.

[0190] During the second period TB1, the current value of the drive signal is maintained at the second current value A2, so that the displacement angle of the oscillating portion 21 is maintained at the second angle D2 during the second period TB1.

[0191] In the third period TA2, the current value of the drive signal is maintained at the second current value A2 for a predetermined period, and then changes from the second current value A2 to the first current value A1. As a result, in the third period TA2, the displacement angle of the oscillating part 21 is maintained at the second angle D2 for the predetermined period, and then changes from the second angle D2 to the first angle D1.

[0192] During the fourth period TB2, the current value of the drive signal is maintained at the first current value A1, so that the displacement angle of the oscillating portion 21 is maintained at the first angle D1 during the fourth period TB2.

[0193] In this way, the swinging portion 12A repeatedly changes its posture from the first angle D1 to the second angle D2 in response to the drive signal given to the actuator 12B from the drive circuit.

[0194] (Pixel operation by optical path control mechanism) Hereinafter, the operation when the first oscillation section 21A and the second oscillation section 21B are oscillated will be described. Figure 21 is an explanatory diagram illustrating a one-axis oscillation pattern of the optical section according to the fourth embodiment of the present disclosure.

[0195] In the optical path control mechanism 12 of the fourth embodiment, the actuator 12B swings the swinging unit 12A in response to a drive signal so as to repeatedly change its posture around the first axis AX from a first angle D1 to a second angle D2. As the swinging unit 12A repeatedly swings between the first angle D1 and the second angle D2, the optical axis of the light L (the position where an image is displayed) repeatedly switches between the first position and the second position.

[0196] A specific description will be given below. The reference position P0 is the position (position of the optical axis) where an image is displayed when the current value applied to the actuator 12B is 0, that is, when the displacement angle of the optical member 20 is 0.

[0197] (Red subframe display in first position) The A-operation state shown in FIG. 21 is a state in which the actuator 12B oscillates the optical element 20 to one side about the oscillation axis AX by a predetermined angle, thereby shifting the optical axis (image display position) from the reference position P0 by 1 / 4 pixel to one side in a direction perpendicular to the oscillation axis AX. In this embodiment, the A-operation state is a state in which the oscillation unit 12A faces a first direction; in other words, a state in which the position at which the image is displayed (the position of the optical axis) is at a first position PG1. The first position PG1 is a position shifted from the reference position P0 in the direction of a vector (first diagonal direction) toward one side in a direction perpendicular to the oscillation axis AX. In the example of FIG. 20, the A-operation state may be a period in which the displacement angle of the oscillation unit is D2 (the latter half of the period TA1).

[0198] In this embodiment, the video signal processing circuit 160 displays the red sub-frame R (red image) while the position where the image is displayed is at the first position PG1, in other words, while the oscillating unit 12A is facing the first direction. More specifically, the video signal processing circuit 160 displays the red sub-frame R while the oscillating unit 12A is facing the first direction and is stationary.

[0199] (1st green subframe display at 1st position) 21 is a state in which the position where an image is displayed (the position of the optical axis) is at the first position PG1. The B operating state can also be said to be a state in which the oscillating part 12A faces the first direction. In the example of FIG. 20, the B operating state may be the period (period TB1) in which the displacement angle of the oscillating part is D2.

[0200] In this embodiment, the video signal processing circuit 160 displays the first green sub-frame G1 (green image) during a period when the image display position is at the first position PG1 immediately after the red sub-frame R, in other words, during a period when the oscillating unit 12A faces the first direction. More specifically, the video signal processing circuit 160 displays the first green sub-frame G1 during a period when the oscillating unit 12A faces the first direction and is stationary (during period TB1 in the example of FIG. 20 ).

[0201] (Blue subframe displayed in first position) 21 is a state in which the position where the image is displayed (the position of the optical axis) is at the first position PG1. The C operating state can also be said to be a state in which the oscillating part 12A faces the first direction. In the example of FIG. 20, the C operating state may be the period in which the displacement angle of the oscillating part is D2 (the first half of the period TA2).

[0202] In this embodiment, video signal processing circuit 160 displays blue subframe B (a blue image) during a period when the image display position is at first position PG1 immediately after first green subframe G1, in other words, during a period when oscillating unit 12A faces the first direction. More specifically, video signal processing circuit 160 displays blue subframe B during a period when oscillating unit 12A faces the first direction and is stationary.

[0203] (Display of second green subframe in second position) The D operating state shown in FIG. 21 is a state in which the actuator 12B swings the optical element 20 to the other side around the swing axis AX by a predetermined angle, and the optical axis (image display position) is shifted by 1 / 4 pixel to the other side (second diagonal direction) in the direction perpendicular to the swing axis AX with respect to the reference position P0. In this embodiment, the D operating state is a state in which the swing unit 12A faces the second direction; in other words, a state in which the position where the image is displayed (position of the optical axis) is at the second position PG2. The second position PG2 is point-symmetric with respect to the first position PG1, with respect to the reference position P0. In the example of FIG. 20, the D operating state may be the period (period TB2) in which the swing unit has a displacement angle of D1.

[0204] In this embodiment, the video signal processing circuit 160 displays the second green sub-frame G2 (a green image) while the image display position is at the second position PG2, in other words, while the oscillating unit 12A faces the second direction. More specifically, the video signal processing circuit 160 displays the second green sub-frame G2 while the oscillating unit 12A faces the second direction and is stationary (during period TB2 in the example of FIG. 20).

[0205] In this embodiment, during the period when the image display position is at the first position PG1, the first green sub-frame G1 is arranged between the red sub-frame R and the blue sub-frame B. This allows the green image to be displayed for a long period while the oscillating part 12A is stationary, thereby improving the image quality.

[0206] (effect) According to the configuration described above, by using a single-panel system to shift the pixels of the green sub-frame image in a diagonal direction, by not displaying consecutive green sub-frames, and by displaying red, blue, and green sub-frames of the same pixel in the same position, color shift is reduced and the resolution of the projected image can be made higher than the resolution of the display element 106. Since human visual sensitivity is highest in the green range, by shifting the green pixels by 0.5 pixels and arranging the pixels twice as large, a substantially higher resolution can be perceived.

[0207] (Composition and Effects) A display device 1 according to the present disclosure includes an oscillating unit 12A having an optical member 20 onto which light L is incident, an actuator 12B that oscillates the oscillating unit 12A, a video signal processing circuit 160 that divides one frame of a video signal into a red subframe R, a blue subframe B, a first green subframe G1, and a second green subframe G2 and switches between displaying the red subframe R, the blue subframe B, the first green subframe G1, and the second green subframe G2 during one frame of the video signal, while preventing the first green subframe G1 and the second green subframe G2 from being displayed consecutively, and a drive circuit 16 that causes the actuator 12B to oscillate the oscillating unit 12A to control the optical path. The video signal processing circuit 160 displays the first green sub-frame G1 during the period when the oscillating portion 12A faces a first direction, and displays the second green sub-frame G2 during the period when the oscillating portion 12A faces a second direction different from the first direction, thereby displaying the first green sub-frame G1 and the second green sub-frame G2 at positions that are point-symmetric with respect to the reference position P0.

[0208] According to this configuration, by not displaying consecutive green subframes and by displaying the green image at a point-symmetrical position relative to the reference position, color breakup can be suppressed and the resolution can be appropriately increased with a simple configuration. Furthermore, since the display element 106 is a single-panel type, the configuration can be simplified. Therefore, it is possible to provide a display device 1 that can appropriately increase the resolution with a simple configuration.

[0209] The video signal processing circuit 160 displays the red sub-frame R and the blue sub-frame B at the reference position P0 by displaying the red sub-frame R and the blue sub-frame B during the period when the oscillating portion 12A is facing a third direction between the first direction and the second direction.

[0210] According to this configuration, by not displaying consecutive green subframes and by displaying the green image at a point-symmetrical position relative to the reference position, color breakup can be suppressed and the resolution can be appropriately increased with a simple configuration. Also, by displaying the red image and the blue image at the same position, a display with little color shift can be achieved. Therefore, a display device 1 that can appropriately increase the resolution with a simple configuration can be provided.

[0211] The video signal processing circuit 160 of the present disclosure displays either the red subframe R or the blue subframe B during the period when the oscillating portion 12A is facing a first direction, thereby displaying either the red subframe R or the blue subframe B and the first green subframe G1 at the same position relative to the reference position P0, and displays the other of the red subframe R or the blue subframe B during the period when the oscillating portion 12A is facing a second direction, thereby displaying the other of the red subframe R or the blue subframe B and the second green subframe G2 at the same position relative to the reference position P0.

[0212] According to this configuration, by not displaying consecutive green subframes and by displaying the green image at a point-symmetrical position relative to the reference position, color breakup can be suppressed and the resolution can be appropriately increased with a simple configuration. Also, by displaying the red image and the blue image at the same position, a display with little color shift can be achieved. Therefore, a display device 1 that can appropriately increase the resolution with a simple configuration can be provided.

[0213] The video signal processing circuit 160 according to the present disclosure displays the red subframe R and the blue subframe B during the period when the oscillating portion 12A faces the first direction, thereby displaying the red subframe R, the blue subframe B, and the first green subframe G1 at the same position relative to the reference position P0.

[0214] According to this configuration, by using a single-panel system to shift the image of the green subframe in a diagonal direction, by not displaying consecutive green subframes, and by displaying the red subframe, blue subframe, and green subframe of the same pixel in the same position, color shift is reduced and the resolution of the projected image can be made higher than the resolution of the display element 106. Therefore, it is possible to provide a display device 1 that can appropriately increase the resolution with a simple configuration.

[0215] The video signal processing circuit 160 displays a blue subframe B during a period when the oscillating portion 12A faces a third direction different from the first direction and the second direction, and displays a red subframe R during a period when the oscillating portion 12A faces a fourth direction different from the first direction, the second direction, and the third direction, thereby displaying the blue subframe B and the red subframe R at positions that are point-symmetrical to each other with respect to the reference position P0 and at positions different from the first green subframe G1 and the second green subframe G2.

[0216] With this configuration, by not displaying consecutive green subframes and by displaying the green image at a point-symmetrical position relative to the reference position, it is possible to appropriately increase the resolution with a simple configuration while suppressing color breakup. Also, by displaying the image of each subframe at a different position, it is possible to display with little color shift.

[0217] The video signal processing circuit 160 displays the first green sub-frame G1 and the second green sub-frame G2 during the period when the oscillation of the oscillation unit 12A is stopped. With this configuration, the first green sub-frame G1 and the second green sub-frame G2 are displayed during the time when the optical path control mechanism 12 is stopped, making it possible to display an image with less blurring.

[0218] Although the embodiments of the present invention have been described above, the embodiments are not limited to the contents of these embodiments. Furthermore, the above-described components include those that can be easily imagined by a person skilled in the art, those that are substantially the same, and those that are within the scope of what is called equivalents. Furthermore, the above-described components can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of the components can be made without departing from the spirit of the above-described embodiments. [Explanation of symbols]

[0219] 1 Display device 10 Optical path control device 12 Optical path control mechanism 12A Swinging part 12B Actuator 14 Control circuit 16 Drive circuit (drive unit) 20 Optical components (optical part) 21A First swinging part 21B Second swinging part 23A 1st shaft part 23B 2nd shaft part 25 First Actuator 26 Second Actuator 27 Support part 31 1st moving part 32 Second moving part 41,44 Coil 42,45,271 York 43,46 Magnet 100 Irradiation device AX First swing axis BX Second swing axis

Claims

1. a swinging portion having an optical member onto which light is incident; an actuator that swings the swinging part; a video signal processing circuit that divides one frame of a video signal into a red subframe, a blue subframe, a first green subframe, and a second green subframe, and switches between displaying the red subframe, the blue subframe, the first green subframe, and the second green subframe during one frame of the video signal, while performing processing that prevents the first green subframe and the second green subframe from being displayed consecutively; a drive circuit that controls the optical path by causing the actuator to swing the swinging part, The video signal processing circuit displaying the first green subframe during a period in which the swinging portion faces a first direction, displaying the second green subframe during a period in which the swinging portion faces a second direction different from the first direction, displaying one of the red subframe and the blue subframe during a period in which the swinging portion faces the first direction, and displaying the other of the red subframe and the blue subframe during a period in which the swinging portion faces the second direction, the first green subframe and the second green subframe are displayed at positions that are point-symmetric with respect to a reference position, one of the red subframe or the blue subframe and the first green subframe are displayed at the same position with respect to the reference position, and the other of the red subframe or the blue subframe and the second green subframe are displayed at the same position with respect to the reference position. Display device.

2. the video signal processing circuit displays the first green sub-frame and the second green sub-frame during a period in which the oscillation portion stops oscillating. The display device according to claim 1 .

3. a swinging portion having an optical member onto which light is incident; an actuator that swings the swinging portion, dividing one frame of a video signal into a red subframe, a blue subframe, a first green subframe, and a second green subframe, and alternately displaying the red subframe, the blue subframe, the first green subframe, and the second green subframe during one frame of the video signal, while not displaying the first green subframe and the second green subframe consecutively; and controlling the optical path by causing an actuator to swing the swinging unit, displaying the first green subframe during a period in which the swinging portion faces a first direction, displaying the second green subframe during a period in which the swinging portion faces a second direction different from the first direction, displaying one of the red subframe and the blue subframe during a period in which the swinging portion faces the first direction, and displaying the other of the red subframe and the blue subframe during a period in which the swinging portion faces the second direction, the first green subframe and the second green subframe are displayed at positions that are point-symmetric with respect to a reference position, one of the red subframe or the blue subframe and the first green subframe are displayed at the same position with respect to the reference position, and the other of the red subframe or the blue subframe and the second green subframe are displayed at the same position with respect to the reference position. Display method.

4. a swinging portion having an optical member onto which light is incident; an actuator that swings the swinging unit; and a program that causes a computer of a display device to execute processing, dividing one frame of a video signal into a red subframe, a blue subframe, a first green subframe, and a second green subframe, and alternately displaying the red subframe, the blue subframe, the first green subframe, and the second green subframe during one frame of the video signal, while not displaying the first green subframe and the second green subframe consecutively; and controlling the optical path by causing an actuator to swing the swinging unit, displaying the first green subframe during a period in which the swinging portion faces a first direction, displaying the second green subframe during a period in which the swinging portion faces a second direction different from the first direction, displaying one of the red subframe and the blue subframe during a period in which the swinging portion faces the first direction, and displaying the other of the red subframe and the blue subframe during a period in which the swinging portion faces the second direction, the first green subframe and the second green subframe are displayed at positions that are point-symmetric with respect to a reference position, one of the red subframe or the blue subframe and the first green subframe are displayed at the same position with respect to the reference position, and the other of the red subframe or the blue subframe and the second green subframe are displayed at the same position with respect to the reference position. program.

Images