Projection type display device

Abstract

The invention provides a projection-type display device which ensures a color reproduction region in high-resolution color display. A projection-type display device includes: a liquid crystal panel (100a) that generates a first image; a liquid crystal panel (100b) that generates a second image; a prism (180) that synthesizes and emits the first image and a second image shifted in the lateral direction with respect to the first pixel; an optical path shift element (190) that shifts the optical path of the output image from the prism (180); and a display control circuit (20) that controls the liquid crystal panels (100a, 100b) and the optical path shift element (190). The display control circuit (20) supplies data signals of a first color component in odd-numbered rows in the video pixel data to the liquid crystal panel (100a) during a first unit period, and supplies data signals of the same first color component in even-numbered rows in the video pixel data to the liquid crystal panel (100a) during a second unit period.

Description

Technical Field

[0001] The present invention relates to a projection type display device. Background Art

[0002] The following technology has been proposed: in a projection display device that projects image light generated by a liquid crystal panel or the like onto a screen or the like, a first optical image generated by a first optical system and a second optical image generated by a second optical system are offset and synthesized, and then projected to achieve high resolution (for example, refer to Patent Document 1).

[0003] Specifically, when color display is realized in the above-mentioned technology, the structure is as follows. That is, the structure is as follows: in the first optical system, the images based on the three liquid crystal panels are synthesized as the first optical image by using the first dichroic prism, and in the second optical system, the images based on the three liquid crystal panels are synthesized as the second optical image by using the second dichroic prism, and the first optical image and the second optical image are synthesized by using the prism.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2010-181670

[0005] However, the above technology requires not only a total of six liquid crystal panels but also three prisms for synthesizing optical images. Therefore, the above technology has the following problems: in order to achieve high-resolution color display, not only the structure is complicated, but also the cost is increased. Summary of the invention

[0006] In order to solve the above-mentioned problems, a projection display device of one embodiment of the present disclosure includes: a first image light emitting device, which emits a first color light component and a second color light component in the first image light in a time-division manner; a second image light emitting device, which emits the first color light component and the second color light component in the second image light in a time-division manner; a synthetic optical system, which synthesizes the first image light and the second image light in a state where the second image light is shifted along a first direction relative to the first image light, and emits the synthesized light; an optical path shifting element, which shifts the optical path of the synthesized light emitted from the synthetic optical system;and a display control circuit, which controls the first image light emitting device, the second image light emitting device and the optical path shifting element, wherein one frame period includes a first unit period, a second unit period, a third unit period and a fourth unit period, and the display control circuit supplies, during the first unit period, to the first image light emitting device a data signal of the first color light component in the image pixels that are odd-numbered in a second direction intersecting the first direction of the image pixel data and arranged along the first direction, among the data signals corresponding to the grayscale levels specified by the image pixel data arranged in a matrix, and supplies to the first image light emitting device a data signal of the first color light component in the image pixels that are odd-numbered in a second direction intersecting the first direction of the image pixel data and arranged along the first direction, and supplies to the first image light emitting device a data signal of the first color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction, among the data signals corresponding to the grayscale levels specified by the image pixel data arranged in a matrix The data signal of one of the first color light component and the second color light component in the image pixels arranged in the first direction is supplied to the second image light emitting device, the optical path shifting element is controlled, the optical path is set to a reference position, and during the second unit period, the data signal of the first color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of one of the first color light component and the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device. The light emitting device controls the optical path shifting element to shift the optical path along the second direction, during the third unit, supplies the data signal of the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction to the first image light emitting device, supplies the data signal of the other of the first color light component and the second color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction to the second image light emitting device, controls the optical path shifting element to return the optical path to the reference position, during the fourth unit, supplies the data signal of the second color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction to the second image light emitting device, controls the optical path shifting element to return the optical path to the reference position, and during the fourth unit, supplies the data signal of the second color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction to the second image light emitting device. The data signal of the second color light component in the image pixels that are even-numbered in the second direction of the pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of the other of the first color light component and the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device, and the optical path shifting element is controlled to shift the optical path along the second direction, so that the first image light emitting device emits the first image light based on the supplied data signal, and the second image light emitting device emits the second image light based on the supplied data signal. ; BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a diagram showing a projection type display device according to the first embodiment.

[0008] Figure 2 It is a block diagram showing the structure of a projection type display device.

[0009] Figure 3 This is a diagram showing the arrangement of image pixels in a projection display device.

[0010] Figure 4 It is a diagram showing the arrangement of panel pixels in a projection type display device.

[0011] Figure 5 It is a perspective view showing the structure of a liquid crystal panel in a projection type display device.

[0012] Figure 6 is a cross-sectional view showing the structure of a liquid crystal panel.

[0013] Figure 7 is a block diagram showing the electrical structure of a liquid crystal panel.

[0014] Figure 8 A diagram showing the structure of a pixel circuit in a liquid crystal panel.

[0015] Fig. 9 This is a diagram for explaining the operation of one frame period in the projection type display device.

[0016] Fig.10 It is a diagram for explaining a writing operation in a liquid crystal panel.

[0017] Fig.11 This is a diagram showing the relationship between image pixels, panel pixels, and projection positions within one frame period.

[0018] Fig.12 This is a diagram for explaining how to reduce the narrowing of the color reproduction range in a projection type display device.

[0019] Fig.13 It is a diagram showing the arrangement of panel pixels in a first modification example of the first embodiment.

[0020] Fig.14 It is a diagram showing the arrangement of panel pixels in a second modification example of the first embodiment.

[0021] Fig.15 This is a diagram showing the color order in the third modification example of the first embodiment.

[0022] Fig.16 It is a diagram showing the color order in the fourth modification example of the first embodiment.

[0023] Fig.17It is a diagram for explaining the operation during two frame periods in the projection display device according to the second embodiment.

[0024] Fig.18 This is a diagram for explaining a tendency to suppress a narrowing of a color reproduction range in a projection type display device.

[0025] Fig.19 It is a diagram for explaining the operation of the projection display device of the comparative example in one frame period.

[0026] Fig. 20 It is a diagram for explaining the narrowing of the color reproduction range in the projection display device of the comparative example.

[0027] Fig.21 It is a diagram for explaining the reduction in brightness in the projection display device of the comparative example.

[0028] Description of symbols

[0029] 1: projection display device; 100a, 100b: liquid crystal panel; 110: pixel circuit; 118: pixel electrode; 120: liquid crystal element; 20: display control circuit; 21: processing circuit; 22a, 22b: conversion circuit; 180: prism; 190: optical path shift element. DETAILED DESCRIPTION

[0030] Hereinafter, the projection display device of the embodiment will be described with reference to the accompanying drawings. In addition, in each figure, the size and scale of each part are appropriately different from the actual size and scale. In addition, the embodiment described below is a preferred specific example, and therefore various technically preferred limitations are added, but as long as there is no record of the subject matter of the present disclosure being particularly limited in the following description, the scope of the present disclosure is not limited to these modes.

[0031] Figure 1 The projection display device 1 according to the first embodiment shows an optical structure. The projection display device 1 includes liquid crystal panels 100 a and 100 b , light sources 151 and 152 , polarization optical systems 160 a and 160 b , a prism 180 , an optical path shifting element 190 , and a projection lens 200 .

[0032] The light source 151 includes laser light sources 151R, 151G, and 151B. The laser light source 151R emits light in a red wavelength band, the laser light source 151G emits light in a green wavelength band, and the laser light source 151B emits light in a blue wavelength band.

[0033] The polarization optical system 160a diffuses the emitted light from the laser light sources 151R, 151G, and 151B to form a substantially uniform illumination and substantially parallel light beam, converts the light beam into P polarized light, and emits it to the transmissive liquid crystal panel 100a. In addition, the conversion into P polarized light also includes transmitting the P polarized light. A polarizing plate 171a is provided between the emission surface of the polarization optical system 160a and the incident surface of the liquid crystal panel 100a, and a polarizing plate 172a is provided on the emission surface of the liquid crystal panel 100a.

[0034] In addition, the transmission axis of the polarizing plate 171a is P polarized light, and the transmission axis of the polarizing plate 172a is S polarized light. Therefore, the P polarized component that is not modulated by the liquid crystal panel 100a is blocked by the polarizing plate 172a.

[0035] The light source 152 includes laser light sources 152R, 152G, and 152B similarly to the light source 151. The laser light source 152R emits light in the red wavelength band, the laser light source 152G emits light in the green wavelength band, and the laser light source 152B emits light in the blue wavelength band.

[0036] The polarization optical system 160b diffuses the emitted light from the laser light sources 152R, 152G, and 152B to form a substantially uniform illumination and substantially parallel light beam, converts the light beam into S polarized light, and emits it to the transmissive liquid crystal panel 100b. In addition, converting to S polarized light also includes transmitting the S polarized light. A polarizing plate 171b is provided between the emission surface of the polarization optical system 160b and the incident surface of the liquid crystal panel 100b, and a polarizing plate 172b is provided on the emission surface of the liquid crystal panel 100b.

[0037] In addition, the transmission axis of the polarizing plate 171b is S polarized light, and the transmission axis of the polarizing plate 172b is P polarized light. Therefore, the S polarized component that is not modulated by the liquid crystal panel 100b is blocked by the polarizing plate 172b.

[0038] The liquid crystal panels 100a and 100b have a plurality of pixel circuits as described later. The plurality of pixel circuits each include a liquid crystal element. The liquid crystal element of the liquid crystal panel 100a is driven based on a data signal supplied from a display control circuit, and modulates the incident light according to the voltage of the data signal. Through this modulation, the amount of light transmitted through the polarizing plate 172a changes, that is, the transmittance changes. Therefore, by controlling the modulation performed by the liquid crystal elements based on the data signal, a transmission image is generated in the liquid crystal panel 100a. Similarly, a transmission image is generated in the liquid crystal panel 100b.

[0039] The transmission image of the liquid crystal panel 100a is Figure 1The transmitted image of the liquid crystal panel 100a is incident on the prism 180 from the 9 o'clock direction, and the transmitted image of the liquid crystal panel 100b is incident on the prism 180 from the 12 o'clock direction. At the bonding surface 182 of the prism 180, the S polarized light in the transmitted image of the liquid crystal panel 100a is transmitted and goes straight, and the P polarized light in the transmitted image of the liquid crystal panel 100b is reflected.

[0040] Therefore, the transmitted image of the liquid crystal panel 100 a and the transmitted image of the liquid crystal panel 100 b are synthesized in the prism 180 , and the synthesized image is emitted in the direction of 3 o'clock. The synthesized image of the prism 180 enters the projection lens 200 via the optical path shifting element 190 .

[0041] The projection lens 200 enlarges and projects the synthesized image that has passed through the optical path shifting element 190 onto the screen Scr.

[0042] The optical path shifting element 190 shifts the optical path of the light emitted from the prism 180 to shift the synthetic image projected onto the screen Scr in the left-right direction or the up-down direction relative to the projection surface.

[0043] In addition, at the joint surface 182 of the prism 180, the transmission image based on the liquid crystal panel 100a is straight, while the transmission image based on the liquid crystal panel 100b is reflected. Therefore, the transmission image based on the liquid crystal panel 100b is generated in a left-right inversion relative to the transmission image of the liquid crystal panel 100a. In addition, the pixels of the transmission image based on the liquid crystal panel 100a and the transmission image based on the liquid crystal panel 100b are inconsistent with each other, and as described later, they are synthesized in an offset state.

[0044] Figure 2 1 is a block diagram showing the electrical structure of the projection display device 1. As shown in the figure, the projection display device 1 includes a display control circuit 20 in addition to the liquid crystal panels 100a, 100b, the light sources 151, 152 and the optical path shift element 190 described above.

[0045] The video data Vid_in is supplied from a host device (not shown) or the like in synchronization with a synchronization signal Sync. The video data Vid_in specifies the grayscale level of a pixel in an image constituting a video in a one-frame period, for example, using 8 bits for each RGB.

[0046] In addition, the pixels of the image specified by the image data Vid_in are marked as image pixels, and the data specifying the grayscale level of the image pixels are marked as image pixel data, but sometimes the image pixels and image pixel data are not particularly distinguished. In addition, the pixels of the image before or after synthesis based on the liquid crystal panel 100a or the liquid crystal panel 100b are marked as panel pixels. The position of the panel pixel shifted by the optical path shifting element 190 and projected on the screen Scr is marked as the projection position.

[0047] In the liquid crystal panel 100a and the liquid crystal panel 100b, the panel pixels corresponding to the pixel circuit are arranged in a matrix when viewed from above. In an embodiment, the arrangement of the image pixels specified by the image data Vid_in is twice as long in the vertical direction and twice as long in the horizontal direction as the arrangement of the panel pixels based on the liquid crystal panel 100a or 100b.

[0048] The synchronization signal Sync includes a vertical synchronization signal for instructing the start of vertical scanning of the video data Vid_in, a horizontal synchronization signal for instructing the start of horizontal scanning, and a clock signal indicating the timing of one video pixel in the video data Vid_in.

[0049] The display control circuit 20 includes a processing circuit 21 and conversion circuits 22 a and 22 b .

[0050] The processing circuit 21 controls the conversion circuits 22a, 22b, the liquid crystal panels 100a, 100b, the light sources 151 and 152 in each writing period described below based on the synchronization signal Sync, and controls the optical path shift element 190 in each period described below. The optical path shift element 190 shifts the projection position according to the control performed by the processing circuit 21.

[0051] Figure 3 This figure shows a part of the arrangement of image pixels represented by the image data Vid_in extracted.

[0052] In the figure, in order to distinguish the image pixels in the image represented by the image data Vid_in, for convenience, the first row is assigned A1 to A4, the second row is assigned B1 to B4, the third row is assigned C1 to C4, and the fourth row is assigned D1 to D4.

[0053] Return to Figure 2 In the video data Vid_in, the video pixel data specifying the grayscale level of the video pixel to be expressed by the liquid crystal panel 100a is denoted as Va, and the video pixel data specifying the grayscale level of the video pixel to be expressed by the liquid crystal panel 100b is denoted as Vb.

[0054] After temporarily accumulating the image pixel data Va for one or more frame periods in the internal buffer, the conversion circuit 22a reads out the image pixel data of the color component corresponding to the writing period, converts it into an analog voltage data signal Vid_a of the polarity corresponding to the writing period, and supplies it to the liquid crystal panel 100a.

[0055] The conversion circuit 22b is the same as the conversion circuit 22a in that the conversion circuit 22b is different from the conversion circuit 22a only in the image pixel data to be converted. That is, after temporarily accumulating the image pixel data Vb, the conversion circuit 22b reads the image pixel data of the color component corresponding to the writing period, converts it into a data signal Vid_b of an analog voltage of a polarity corresponding to the writing period, and supplies it to the liquid crystal panel 100b.

[0056] In addition, which image pixel's grayscale level is designated by the image pixel data Va and Vb will be described later.

[0057] Figure 4 The panel pixels of the liquid crystal panel 100a and the panel pixels of the liquid crystal panel 100b are extracted. Figure 3 The arrangement of image pixels corresponds to the panel pixels shown in the figure.

[0058] In addition, for the convenience of description, the panel pixels of the liquid crystal panel 100 a are marked as panel pixels a, and the panel pixels of the liquid crystal panel 100 b are marked as panel pixels b.

[0059] In the arrangement of the left column, in order to distinguish the panel pixels a, for convenience, a1 and a2 are assigned to the first row, and a3 and a4 are assigned to the second row. In the arrangement of the right column, in order to distinguish the panel pixels b, for convenience, b1 and b2 are assigned to the first row, and b3 and b4 are assigned to the second row.

[0060] As described later, in order to improve the efficiency of light utilization, a microlens is provided for each panel pixel in the liquid crystal panels 100a and 100b. Therefore, the brightness of the panel pixels is not uniform when viewed from above. In fact, it becomes brighter near the center of the panel pixel and becomes darker as it moves from the center to the outside. In the figure, the circle of the panel pixels a and b simply represents the part that becomes brighter than other parts due to the focusing of the microlens. The center of the circle is roughly consistent with the diagonal center of the panel pixel a or the panel pixel b.

[0061] The arrangement of the panel pixel a and the panel pixel b relative to the prism 180 is as follows: Figure 4 The relationship is shown in the lower column of . Specifically, the relationship is as follows: the arrangement of panel pixels b is offset to the right by 0.5 pixels of the panel pixels in the figure relative to the arrangement of panel pixels a. Specifically, the center of panel pixel b1 is located between the center of panel pixel a1 and the center of panel pixel a2, and the center of panel pixel b3 is located between the center of panel pixel a3 and the center of panel pixel a4.

[0062] Next, the liquid crystal panel 100 a and the liquid crystal panel 100 b are described.

[0063] The liquid crystal panel 100a and the liquid crystal panel 100b are different only in the data signals supplied thereto, and have a common structure. Therefore, the liquid crystal panel 100a and the liquid crystal panel 100b are generally described with reference numeral 100 without specifying any one of them.

[0064] Figure 5 is a perspective view showing the liquid crystal panel 100, Figure 6 So Figure 5 A cross-sectional view obtained by cutting along the Hh line in FIG.

[0065] As shown in these figures, in the liquid crystal panel 100, the element substrate 101 provided with the pixel electrode 118 and the counter substrate 102 provided with the common electrode 108 are bonded together by the sealing material 90 with the electrode forming surfaces facing each other while maintaining a certain gap, and the liquid crystal 105 is sealed in the gap.

[0066] As the element substrate 101 and the counter substrate 102, a light-transmitting substrate such as glass or quartz is used. Figure 5 As shown, one side of the element substrate 101 extends from the counter substrate 102. In the extended region, a plurality of terminals 106 are provided along the lateral direction in the figure. One end of an FPC (Flexible Printed Circuits) substrate (not shown) is connected to the plurality of terminals 106. In addition, the other end of the FPC substrate is connected to the display control circuit 20, and the above-mentioned various signals are supplied.

[0067] The pixel electrode 118 is formed on the surface of the element substrate 101 facing the counter substrate 102 by patterning a transparent conductive layer such as ITO (Indium Tin Oxide).

[0068] In addition, although not shown in the figure, in order to efficiently send a large amount of light to the opening portion that becomes the panel pixel, a microlens is provided for each panel pixel on the opposing substrate 102 (or the element substrate 101). With this structure, the light bounced by the light shielding portion is sent to the opening portion of the microlens, thereby improving the efficiency of light utilization. In addition, the reason for providing the light shielding portion is to determine the outer edge of the panel pixel and to prevent light leakage in the transistor.

[0069] Figure 7 2 is a block diagram showing an electrical structure of the liquid crystal panel 100 . In the liquid crystal panel 100 , a scanning line driving circuit 130 and a data line driving circuit 140 are provided around the display region 10 .

[0070] In the display area 10, the pixel circuits 110 are arranged in a matrix. Specifically, in the display area 10, a plurality of scanning lines 12 are arranged to extend in the horizontal direction in the figure, and a plurality of data lines 14 are arranged to extend in the vertical direction and to be electrically insulated from the scanning lines 12. In addition, the pixel circuits 110 are arranged in a matrix corresponding to the intersections of the plurality of scanning lines 12 and the plurality of data lines 14.

[0071] When the number of scan lines 12 is set to m and the number of data lines 14 is set to n, the pixel circuits 110 are arranged in a matrix with m rows in the vertical direction and n columns in the horizontal direction. Both m and n are integers greater than 2. In order to distinguish the rows of the matrix in the scan lines 12 and the pixel circuits 110, they are sometimes referred to as the 1st, 2nd, 3rd, ..., (m-1), and mth rows from the top in the figure. Similarly, in order to distinguish the columns of the matrix in the data lines 14 and the pixel circuits 110, they are sometimes referred to as the 1st, 2nd, 3rd, ..., (n-1), and nth columns from the left in the figure.

[0072] Furthermore, the image pixels are arranged twice as many vertically as the panel pixels and twice as many horizontally, so the image pixels are arranged in (2m) vertical rows and (2n) horizontal columns.

[0073] "Row" and "column" are relative concepts and are in the following relationship: when one of the horizontal (left-right) direction and the vertical (up-down) direction is set as a "row", the other of the horizontal and vertical directions is a "column". However, in this description, for convenience, as described above, the horizontal direction in which the scanning line 12 extends is set as a "row", and the vertical direction in which the data line 14 extends is set as a "column". The same is true for odd-numbered rows and even-numbered rows, odd-numbered columns and even-numbered columns, and they are in the following relationship: when one of the horizontal and vertical directions is set as an odd-numbered row and an even-numbered row, the other of the horizontal and vertical directions is an odd-numbered column and an even-numbered column.

[0074] In order to generally describe the rows of scan lines 12, panel pixels or image pixels, an integer i greater than 1 and less than m is sometimes used. In order to generally describe the columns of data lines 14, panel pixels or image pixels, an integer j greater than 1 and less than n is sometimes used.

[0075] The scanning line driving circuit 130 selects the scanning lines 12 one by one in the order of, for example, the 1st, 2nd, 3rd, ..., mth row according to the control performed by the display control circuit 20, and sets the scanning signal for the selected scanning line 12 to the H level. In addition, the scanning line driving circuit 130 sets the scanning signal for the scanning line 12 other than the selected scanning line 12 to the L level.

[0076] The data line driving circuit 140 outputs the data signal supplied from the corresponding circuit of the conversion circuit 22 a or the conversion circuit 22 b to the pixel circuits 110 located in the 1st to nth columns of the scanning line 12 via the data line 14 while the scanning signal for the scanning line 12 is at H level.

[0077] Figure 8 1 is a diagram showing an equivalent circuit of four pixel circuits 110 in two vertical rows and two horizontal columns corresponding to the intersection of two adjacent scanning lines 12 and two adjacent data lines 14 .

[0078] As shown in the figure, the pixel circuit 110 includes a transistor 116 and a liquid crystal element 120. The transistor 116 is, for example, an n-channel thin film transistor. In the pixel circuit 110, the gate node of the transistor 116 is connected to the scan line 12, the source node of the transistor 116 is connected to the data line 14, and the drain node of the transistor 116 is connected to the pixel electrode 118 which is square in shape when viewed from above.

[0079] The common electrode 108 is provided in common to all pixels so as to face the pixel electrode 118. A voltage LCcom is applied to the common electrode 108. The liquid crystal 105 is sandwiched between the pixel electrode 118 and the common electrode 108 as described above. Therefore, a liquid crystal element 120 in which the liquid crystal 105 is sandwiched between the pixel electrode 118 and the common electrode 108 is formed for each pixel circuit 110.

[0080] In addition, a storage capacitor 109 is provided in parallel with the liquid crystal element 120. One end of the storage capacitor 109 is connected to the pixel electrode 118, and the other end is connected to the capacitor line 107. A temporally constant voltage is applied to the capacitor line 107, for example, a voltage LCcom which is the same as the voltage applied to the common electrode 108. The pixel circuit 110 is arranged in a matrix in the horizontal direction, which is the extension direction of the scanning line 12, and in the vertical direction, which is the extension direction of the data line 14, so the pixel electrodes 118 included in the pixel circuit 110 are also arranged in a matrix in the vertical and horizontal directions.

[0081] In the scanning line 12 whose scanning signal becomes H level, the transistor 116 of the pixel circuit 110 provided corresponding to the scanning line 12 becomes on. By the on-state of the transistor 116, the data line 14 and the pixel electrode 118 are electrically connected, so the data signal supplied to the data line 14 reaches the pixel electrode 118 via the on-state transistor 116. When the scanning line 12 becomes L level, the transistor 116 becomes off, but the voltage of the data signal reaching the pixel electrode 118 is held by the capacitive property of the liquid crystal element 120 and the storage capacitor 109.

[0082] As is well known, in the liquid crystal element 120, the orientation of the liquid crystal molecules changes according to the electric field generated by the pixel electrode 118 and the common electrode 108. Therefore, the liquid crystal element 120 has a transmittance corresponding to the effective value of the applied voltage.

[0083] In addition, the area that functions as a panel pixel in the liquid crystal element 120, that is, the area that becomes the transmittance corresponding to the effective value of the voltage, is the area where the pixel electrode 118 overlaps with the common electrode 108 when looking down at the element substrate 101 and the opposing substrate 102. The pixel electrode 118 is square in plan view, and therefore the shape of the panel pixel of the liquid crystal panel 100 is also square.

[0084] In this embodiment, the liquid crystal 105 is of VA (Vertical Alignment) type, which is a normally black mode in which the transmittance is lowest when the voltage applied to the liquid crystal element 120 is zero and the transmittance increases as the applied voltage increases.

[0085] The writing operation of supplying the data signal to the pixel electrode 118 of the liquid crystal element 120 is performed in the order of the 1st, 2nd, 3rd, ..., mth row. Thus, the liquid crystal elements 120 of the pixel circuit 110 arranged in m rows × n columns respectively maintain a voltage corresponding to the data signal, and each liquid crystal element 120 becomes a target transmittance, and a transmission image is generated by the liquid crystal elements 120 arranged in m rows × n columns.

[0086] In addition, applying a DC voltage to the liquid crystal element 120 will cause the liquid crystal 105 to deteriorate, and therefore, a positive voltage and a negative voltage are alternately applied to the pixel electrode 118 of the liquid crystal element 120. That is, the liquid crystal element 120 is driven by AC. The reference of the polarity is generally the voltage LCcom applied to the common electrode 108. The case where a data signal higher than the voltage LCcom is applied to the pixel electrode 118 is called positive polarity writing, and the case where a data signal lower than the voltage LCcom is applied to the pixel electrode 118 is called negative polarity writing. In addition, considering the pull-down (push down) of the transistor 116, the reference of the polarity is sometimes based on a voltage different from the voltage LCcom.

[0087] As described above, when synthesizing using the prism 180, the arrangement of panel pixels a and the arrangement of panel pixels b are shifted to the right by 0.5 pixels. Therefore, in the synthesized image of the transmission images of the liquid crystal panels 100a and 100b, the panel pixels are arranged in m rows × (2n) columns.

[0088] The image pixels of the image specified by the image data Vid_in are arranged in (2m) rows×(2n) columns, so the resolution in the vertical direction (column direction) is insufficient in the synthesized image.

[0089] Therefore, the operation for visually checking the composite image by doubling the vertical resolution will be described below.

[0090] Fig. 9 These are diagrams for explaining the operation of the projection display device 1 according to the first embodiment.

[0091] As shown in the figure, in this embodiment, one frame period (1F) is divided into six unit periods. The six unit periods are numbered Od-f1, Ev-f1, Od-f2, Ev-f2, Od-f3, and Ev-f3 in chronological order.

[0092] One frame period (1F) is a period for supplying one frame of an image represented by the video data Vid_in. When the frequency of the vertical synchronization signal included in the synchronization signal Sync is 60 Hz, one frame period is 16.7 milliseconds as one cycle.

[0093] The unit period (Od-f1) refers to a period during which the panel pixel a of the liquid crystal panel 100a and the panel pixel b of the liquid crystal panel 100b express any color component of the three primary colors of RGB in the image pixels of odd-numbered rows among the image pixels.

[0094] Specifically, in the unit period (Od-f1), panel pixel a represents the R component (RO) of the image pixel in the odd row and odd column, and panel pixel b represents the G component (GO) of the image pixel in the odd row and even column.

[0095] The unit period (Ev-f1) refers to the period during which the panel pixels a and b express the same color components of the RGB three primary colors in the image pixels of the even-numbered rows of the image pixels as in the immediately preceding unit period (Od-f1). Specifically, in the unit period (Ev-f1), the panel pixel a expresses the R component (RE) of the image pixels in the even-numbered rows and odd-numbered columns of the image pixels, and the panel pixel b expresses the G component (GE) of the image pixels in the even-numbered rows and even-numbered columns of the image pixels.

[0096] Next, the unit period (Od-f2) refers to the period in which panel pixels a and b represent color components of the three primary colors of RGB in the image pixels of odd rows in the image pixels that are different from the unit period (Od-f1) or the unit period (Ev-f1).

[0097] Specifically, in the unit period (Od-f2), panel pixel a represents the G component (GO) of the image pixel in the odd rows and odd columns of the image pixel, and panel pixel b represents the R component (RO) of the image pixel in the odd rows and even columns of the image pixel.

[0098] The unit period (Ev-f2) refers to the period during which the panel pixels a and b express the same color components of the three primary colors of RGB in the image pixels of the even-numbered rows of the image pixels as in the immediately preceding unit period (Od-f2). Specifically, in the unit period (Ev-f2), the panel pixel a expresses the G component (GE) of the image pixels in the even-numbered rows and odd-numbered columns of the image pixels, and the panel pixel b expresses the R component (RE) of the image pixels in the even-numbered rows and even-numbered columns of the image pixels.

[0099] The unit period (Od-f3) refers to the period during which panel pixels a and b represent the remaining one color component of the three primary colors RGB in the image pixels in the odd rows of the image pixels. Specifically, in the unit period (Od-f3), panel pixel a represents the B component (BO) of the image pixels in the odd rows and odd columns of the image pixels, and panel pixel b represents the B component (BO) of the image pixels in the odd rows and even columns of the image pixels.

[0100] The unit period (Ev-f3) refers to the period during which panel pixels a and b represent the remaining one color component of the three primary colors RGB in the image pixels in the even-numbered rows of the image pixels. Specifically, in the unit period (Ev-f3), panel pixel a represents the B component (BE) of the image pixels in the even-numbered rows and odd-numbered columns of the image pixels, and panel pixel b represents the B component (BE) of the image pixels in the even-numbered rows and even-numbered columns of the image pixels.

[0101] In addition, during the unit period (Od-f1, Ev-f1, Od-f2, Ev-f2, Od-f3, and Ev-f3), the conversion circuit 22a supplies the data signal Vid_a corresponding to the image pixel represented by the panel pixel a to the liquid crystal panel.

[0102] In addition, during the unit periods (Od-f1, Ev-f1, Od-f2, Ev-f2, Od-f3, and Ev-f3), the conversion circuit 22b supplies the data signal Vid_b corresponding to the image pixel represented by the panel pixel b to the liquid crystal panel 100b.

[0103] In the unit period (Od-f1, Od-f2 and Od-f3), if the panel pixel a is in the i row and j column, the image pixel in the odd row and odd column represented by the panel pixel a is the image pixel in the (2i-1) row and (2j-1) column. In the same period, if the panel pixel b is in the i row and j column, the image pixel in the odd row and even column represented by the panel pixel b is the image pixel in the (2i-1) row and (2j) column.

[0104] In the unit period (Ed-f1, Ed-f2 and Ed-f3), if the panel pixel a is in the i row and j column, the image pixel in the even row and odd column represented by the panel pixel a is the image pixel in the (2i) row and (2j-1) column. In the same period, if the panel pixel b is in the i row and j column, the image pixel in the even row and even column represented by the panel pixel b is the image pixel in the (2i) row and (2j) column.

[0105] When a panel pixel “represents” a certain image pixel, it means that the liquid crystal element 120 of the panel pixel is in a state of transmittance corresponding to the grayscale level (image pixel data) of the image pixel.

[0106] If 1 frame period (1F) is 16.7 milliseconds, the unit periods (Od-f1, Ev-f1, Od-f2, Ev-f2, Od-f3 and Ev-f3) are 1 / 6, i.e., 2.78 milliseconds. In addition, the unit periods (Od-f1, Ev-f1, Od-f2, Ev-f2, Od-f3 and Ev-f3) are further divided into a writing period (+) for writing a data signal of positive polarity and a writing period (-) for writing a data signal of negative polarity. In addition, for convenience, the writing period (+) of positive polarity is in front, and the writing period (-) of negative polarity is in the back.

[0107] In the first embodiment, the processing circuit 21 controls the optical path shift element 190 as follows. That is, the processing circuit 21 sets the projection position of the optical path shift element 190 to the first position in the unit period (Od-f1, Od-f2, and Od-f3) and to the second position in the unit period (Ev-f1, Ev-f2, and Ev-f3). The second position is a position that is shifted downward by 0.5 pixels of the panel pixel relative to the first position.

[0108] Here, the first location of the projection position is taken as the reference position. When the processing circuit 21 reaches the unit period (Ev-f1, Ev-f2 or Ev-f3), the optical path shift element 190 is controlled to shift the projection position downward by 0.5 pixels of the panel pixel. When the processing circuit 21 reaches the unit period (Od-f1, Od-f2 or Od-f3) at the end of the unit period (Ev-f1, Ev-f2 or Ev-f3), the optical path shift element 190 is controlled to shift the projection position upward by 0.5 pixels of the panel pixel and return to the reference position.

[0109] In addition, the bottom refers to the vertical scanning direction, that is, the direction of selecting the scanning line 12 in sequence. Figure 4 For example, it is the direction from panel pixel a1 toward a3.

[0110] In addition, Fig. 9When the control signal to the optical path shift element 190 is at H level, the projection position becomes a first location as a reference position, and when it is at L level, the projection position becomes a second location shifted downward from the reference position by 0.5 panel pixels.

[0111] The processing circuit 21 controls the light sources 151 and 152 as follows.

[0112] Specifically, first, the processing circuit 21 controls the laser light sources 151R and 152G to be turned on during the negative writing period (-) in the unit period (Od-f1) and the negative writing period (-) in the unit period (Ev-f1), and controls the other laser light sources to be turned off. In addition, the turned-on state of the laser light source refers to the state in which the laser light source emits light, and the turned-off state of the laser light source refers to the state in which the laser light source does not emit light.

[0113] Second, the processing circuit 21 controls the laser light sources 151G and 152R to be in the on state, and controls the other laser light sources to be in the off state, during the negative polarity writing period (-) in the unit period (Od-f2) and the negative polarity writing period (-) in the unit period (Ev-f2).

[0114] Third, the processing circuit 21 controls the laser light sources 151B and 152B to be in the on state, and controls the other laser light sources to be in the off state during the negative polarity writing period (-) in the unit period (Od-f3) and the negative polarity writing period (-) in the unit period (Ev-f3).

[0115] Furthermore, in the positive polarity writing period (+) as other periods in one frame period (1F), the processing circuit 21 controls all of the laser light sources 151R, 151G, 151B, 152R, 152G, and 152B to be in an off state.

[0116] Fig.10 The figure shows the time transition of the scan line 12 selected in the liquid crystal panel 100 when the number of scan lines 12, i.e., the 1st to mth rows, is set as the vertical axis and the elapsed time is set as the horizontal axis. In addition, the figure takes the positive polarity writing period (+) in the unit period (Od-f1) as an example.

[0117] When the selection of the scanning line 12 is indicated by a thick black line, since the scanning line 12 is exclusively selected row by row in each horizontal scanning period (1H), the selected scanning line 12 is sequentially transferred from the 1st row to the mth row row by row as time passes.

[0118] In addition, the positive writing period (+) in the unit period (Od-f1) is followed by the negative writing period (-). Similarly, in the negative writing period (-), the scanning line 12 is exclusively selected in each horizontal scanning period (1H) from the 1st row to the mth row.

[0119] In addition, the unit period (Od-f1) is described here, but in each writing period of other unit periods (Ev-f1, Od-f2, Ev-f2, Od-f3 and Ev-f3), the scanning line 12 is exclusively selected in sequence from the 1st row to the mth row in each horizontal scanning period (1H).

[0120] Fig.11 1 is a diagram showing which image pixel is represented at which projection position of panel pixels a and b in the first embodiment. Fig.11 It is shown Figure 4 The 4 panel pixels a1 to a4 in the upper left column and Figure 4 In the upper right column of the figure, the four panel pixels b1 to b4 are shown at which projection position in the unit period (Od-f1, Od-f2, Od-f3) and the unit period (Ev-f1, Ev-f2, Ev-f3). Figure 3 Figure 1 shows a graph of image pixels.

[0121] First, in the unit period (Od-f1), the panel pixels a1 to a4 represent the R components of the image pixels A1, A3, C1, and C3 in the odd rows and odd columns. In the writing period (-) of the unit period (Od-f1), the laser light source 151R is turned on, so the R components of the image pixels A1, A3, C1, and C3 represented by the panel pixels a1 to a4 are visually recognized by the user.

[0122] In addition, in the unit period (Od-f1), the panel pixels b1 to b4 represent the G components of the image pixels A2, A4, C2, and C4 in the odd rows and even columns. In the writing period (-) of the unit period (Od-f1), the laser light source 152G is turned on, so the G components of the image pixels A2, A4, C2, and C4 represented by the panel pixels b1 to b4 are visually recognized by the user.

[0123] In the next unit period (Ev-f1), the panel pixels a1 to a4 represent the R components of the image pixels B1, B3, D1, and D3 in the even rows and odd columns. In the writing period (-) of the unit period (Ev-f1), the laser light source 151R is turned on, so the R components of the image pixels B1, B3, D1, and D3 represented by the panel pixels a1 to a4 are visually recognized by the user.

[0124] In addition, in the unit period (Ev-f1), the panel pixels b1 to b4 represent the G components of the image pixels B2, B4, D2, and D4 in the even rows and even columns. In the writing period (-) of the unit period (Ev-f1), the laser light source 152G is turned on, so the G components of the image pixels B2, B4, D2, and D4 represented by the panel pixels b1 to b4 are visually recognized by the user.

[0125] The projection position in the unit period (Ev-f1) is the second point P2, which is shifted downward by 0.5 pixels of the panel pixel compared to the first point P1 of the projection position in the unit period (Od-f1).

[0126] Therefore, from the overall unit period (Od-f1, Ev-f1), the R component of the image pixels in odd rows and odd columns, the G component of the image pixels in odd rows and even columns, the R component of the image pixels in even rows and odd columns, and the G component of the image pixels in even rows and even columns are visually confirmed by the user.

[0127] In the unit period (Od-f2), the panel pixels a1 to a4 represent the G components of the image pixels A1, A3, C1, and C3 in the odd rows and odd columns. In the writing period (-) of the unit period (Od-f2), the laser light source 151G is turned on, so the G components of the image pixels A1, A3, C1, and C3 represented by the panel pixels a1 to a4 are visually recognized by the user.

[0128] In addition, in the unit period (Od-f2), the panel pixels b1 to b4 represent the R components of the image pixels A2, A4, C2, and C4 in the odd rows and even columns. In the writing period (-) of the unit period (Od-f2), the laser light source 152R is turned on, so the R components of the image pixels A2, A4, C2, and C4 represented by the panel pixels b1 to b4 are visually recognized by the user.

[0129] In the next unit period (Ev-f2), the panel pixels a1 to a4 represent the G components of the image pixels B1, B3, D1, and D3 in the even rows and odd columns. In the writing period (-) of the unit period (Ev-f2), the laser light source 151G is turned on, so the G components of the image pixels B1, B3, D1, and D3 represented by the panel pixels a1 to a4 are visually recognized by the user.

[0130] In addition, in the unit period (Ev-f2), the panel pixels b1 to b4 represent the R components of the image pixels B2, B4, D2, and D4 in the even rows and even columns. In the writing period (-) of the unit period (Ev-f2), the laser light source 152R is turned on, so the R components of the image pixels B2, B4, D2, and D4 represented by the panel pixels b1 to b4 are visually recognized by the user.

[0131] The projection position in the unit period (Ev-f2) is the second point P2, which is shifted downward by 0.5 pixels of the panel pixel compared to the first point P1 of the projection position in the unit period (Od-f2).

[0132] Therefore, from the overall unit period (Od-f2, Ev-f2), the G component of the image pixels in odd rows and odd columns, the R component of the image pixels in odd rows and even columns, the G component of the image pixels in even rows and odd columns, and the R component of the image pixels in even rows and even columns are visually confirmed by the user.

[0133] In the unit period (Od-f3), the panel pixels a1 to a4 represent the B components of the image pixels A1, A3, C1, and C3 in the odd rows and odd columns. In the writing period (-) of the unit period (Od-f3), the laser light source 151B is turned on, so the B components of the image pixels A1, A3, C1, and C3 represented by the panel pixels a1 to a4 are visually recognized by the user.

[0134] In addition, in the unit period (Od-f2), the panel pixels b1 to b4 represent the B components of the image pixels A2, A4, C2, and C4 in the odd rows and even columns. In the writing period (-) of the unit period (Od-f3), the laser light source 152B is turned on, so the B components of the image pixels A2, A4, C2, and C4 represented by the panel pixels b1 to b4 are visually recognized by the user.

[0135] In the next unit period (Ev-f3), the panel pixels a1 to a4 represent the B components of the image pixels B1, B3, D1, and D3 in the even rows and odd columns. In the writing period (-) of the unit period (Ev-f3), since the laser light source 151B is turned on, the B components of the image pixels B1, B3, D1, and D3 represented by the panel pixels a1 to a4 are visually recognized by the user.

[0136] In addition, in the unit period (Ev-f3), the panel pixels b1 to b4 represent the B components of the image pixels B2, B4, B2, and B4 in the even rows and even columns. In the writing period (-) of the unit period (Ev-f3), the laser light source 152B is turned on, so the B components of the image pixels B2, B4, D2, and D4 represented by the panel pixels b1 to b4 are visually recognized by the user.

[0137] The projection position in the unit period (Ev-f3) is the second point P2, which is shifted downward by 0.5 pixels of the panel pixel compared to the first point P1 of the projection position in the unit period (Od-f3).

[0138] Therefore, from the overall unit period (Od-f3, Ev-f3), the B component of the image pixels in odd rows and odd columns, the B component of the image pixels in odd rows and even columns, the B component of the image pixels in even rows and odd columns, and the B component of the image pixels in even rows and even columns are visually confirmed by the user.

[0139] Therefore, during 1 frame period (1F), in detail, from the unit period (Od-f1) to the unit period (Ev-f3), the image pixels arranged in (2m) rows × (2n) columns are visually confirmed by the user in color through the composite image and shift of the liquid crystal panels 100a and 100b.

[0140] Here, in order to explain the superiority of the projection display device 1 of the embodiment, a projection display device of a comparative example is described. The projection display device of the comparative example has the same structure as the projection display device 1 of the embodiment, but operates differently.

[0141] Fig.19 It is a diagram for explaining the operation of the projection display device of the comparative example in one frame period (1F).

[0142] In the comparative example, 1 frame period (1F) is divided into an odd field period (Od-f) and an even field period (Ev-f). In addition, the odd field period (Od-f) is divided into unit periods (Od-f1, Od-f2, Od-f3), and the even field period (Ev-f) is divided into unit periods (Ev-f1, Ev-f2, Ev-f3).

[0143] In the unit period (Od-f1) in the odd field period (Od-f), the panel pixel a of the liquid crystal panel 100a represents the R component of the image pixel in the odd row and odd column, and the panel pixel b of the liquid crystal panel 100b represents the G component of the image pixel in the odd row and even column. In addition, in the negative polarity writing period (-) in the unit period (Od-f1), the laser light sources 151R and 152G are turned on. Therefore, in this writing period (-), the R component of the image pixel in the odd row and odd column represented by the panel pixel a and the G component of the image pixel in the odd row and even column represented by the panel pixel b are visually confirmed by the user.

[0144] Similarly, during the writing period (-) of the unit period (Od-f2), the G component of the image pixels in the odd rows and odd columns represented by panel pixel a and the R component of the image pixels in the odd rows and even columns represented by panel pixel b are visually confirmed by the user.

[0145] In addition, during the writing period (-) of the unit period (Od-f3), the B component of the image pixels in the odd rows and odd columns represented by panel pixel a and the B component of the image pixels in the odd rows and even columns represented by panel pixel b are visually confirmed by the user.

[0146] In the unit period (Ev-f1) in the even field period (Ev-f), the panel pixel a of the liquid crystal panel 100a represents the R component of the image pixel in the even row and odd column, and the panel pixel b of the liquid crystal panel 100b represents the G component of the image pixel in the even row and even column. In addition, in the negative polarity writing period (-) in the unit period (Ev-f1), the laser light sources 151R and 152G are turned on. Therefore, in this writing period (-), the R component of the image pixel in the even row and odd column represented by the panel pixel a and the G component of the image pixel in the even row and even column represented by the panel pixel b are visually confirmed respectively.

[0147] Similarly, during the writing period (-) of the unit period (Ev-f2), the G component of the image pixels in the even rows and odd columns represented by the panel pixel a and the R component of the image pixels in the even rows and even columns represented by the panel pixel b are visually confirmed.

[0148] Similarly, during the writing period (-) of the unit period (Ev-f3), the B components of the image pixels in the even rows and odd columns represented by the panel pixels a and the B components of the image pixels in the even rows and even columns represented by the panel pixels b are visually confirmed.

[0149] In addition, if the liquid crystal 105 is of the above-mentioned VA type, when the transmittance of the liquid crystal element 120 is the lowest gray level, the applied voltage is substantially zero, so that the liquid crystal molecules are in a planar alignment state in which they are aligned along the substrate surface direction almost only by the restraining force of the alignment film. On the other hand, when the transmittance of the liquid crystal element 120 is the highest gray level, the applied voltage is maximum, and a restraining force of the longitudinal electric field in a direction perpendicular to the substrate surface, i.e., a longitudinal electric field, acts on the liquid crystal molecules, and the liquid crystal molecules are in a vertical alignment state in which they are arranged along the longitudinal direction.

[0150] Here, when the grayscale changes from the minimum value to the maximum value, that is, when the dark state with the minimum transmittance changes to the bright state with the maximum transmittance, the liquid crystal molecules change from the horizontal alignment state to the vertical alignment state. Conversely, when the grayscale changes from the maximum value to the minimum value, that is, when the bright state changes to the dark state, the liquid crystal molecules change from the vertical alignment state to the horizontal alignment state.

[0151] The restraining force based on the alignment film is weaker than the longitudinal restraining force based on the applied voltage. Therefore, the change from the vertical alignment state to the horizontal alignment state in the liquid crystal molecules is slower than the change from the horizontal alignment state to the vertical alignment state. Therefore, in VA-type liquid crystals, there is a tendency that the optical response from the bright state to the dark state is slower than the optical response from the dark state to the bright state.

[0152] In a comparative example using the VA liquid crystal 105 having such a tendency, a study was conducted to determine what would happen when a certain pattern was displayed.

[0153] In addition, a specific pattern refers to a pattern in which, for example, in odd-numbered columns of image pixels, the grayscale level of the R component is a maximum value, and the grayscale levels of the G and B components are a minimum value, and in even-numbered columns of image pixels, the grayscale level of the G component is a maximum value, and the grayscale levels of the R and B components are a minimum value.

[0154] Fig. 20 1 is a diagram showing optical responses, that is, changes in transmittance, of panel pixels a of a liquid crystal panel 100 a and panel pixels b of a liquid crystal panel 100 b in a projection display device of a comparative example.

[0155] When the above-mentioned specific pattern is displayed, in the comparative example, in the unit period (Od-f1, Ev-f1), the data signal of the voltage corresponding to the maximum transmittance is written into the liquid crystal element 120 of the panel pixel a with positive polarity during the writing period (+) and with negative polarity during the writing period (-). Similarly, in the liquid crystal element 120 of the panel pixel b, the data signal of the voltage corresponding to the maximum transmittance is written into the liquid crystal element 120 of the panel pixel b with positive polarity during the writing period (+) and with negative polarity during the writing period (-).

[0156] On the other hand, during the writing periods (+) and (-) of the periods (Od-f2, Od-f3, Ev-f2, Ev-f3), data signals of voltages corresponding to the minimum transmittance are written to the liquid crystal element 120 of the panel pixel a and the liquid crystal element 120 of the panel pixel b, respectively.

[0157] Thus, even if the voltage of the data signal is written into the liquid crystal element 120, the transmittance of the liquid crystal element 120 will not change instantaneously. Specifically, even if a data signal of a voltage equivalent to the maximum transmittance is written into the liquid crystal element 120, the transmittance will not change instantaneously, but will gradually increase from the minimum transmittance. In addition, even if a data signal of a voltage equivalent to the minimum transmittance is written into the liquid crystal element 120, the transmittance will not change instantaneously, but will gradually decrease from the maximum transmittance.

[0158] In the figure, the transmittance is shown as a linear change by a solid line, but actually changes in an integral manner. In addition, the change in transmittance represents the first row written first in the writing period (+) and (-).

[0159] Here, in the change of transmittance, the time required for the change from the maximum value to the minimum value is longer than the time required for the change from the minimum value to the maximum value.

[0160] Therefore, the transmittance of the panel pixel a decreases due to the writing of the data signal during the writing period (+) of the unit period (Od-f2) and the writing period (+) of the unit period (Ev-f2), but the laser light source 151G becomes turned on before the transmittance reaches the minimum. Therefore, although the G component is zero in the image pixel data, the G component is visually confirmed in the panel pixel a.

[0161] Similarly, the transmittance of the panel pixel b decreases due to the writing of the data signal during the writing period (+) of the unit period (Od-f2) and the writing period (+) of the unit period (Ev-f2), but the laser light source 152R is turned on before the transmittance reaches the minimum. Therefore, although the R component is zero in the image pixel data, the R component is visually confirmed in the panel pixel b.

[0162] That is, according to the comparison example, although the panel pixel a is intended to represent only the R component of the image pixels in the odd rows and odd columns and the even rows and odd columns, due to the mixing of the G component, the vertex corresponding to G in the triangle representing the color space (color reproduction domain) that can be reproduced in the projection display device is biased toward Y (yellow).

[0163] Furthermore, although the panel pixel b is intended to express only the G component of the image pixels in the even rows and odd columns and the even rows and even columns, the vertex corresponding to R among the three vertices in the color reproduction area is biased toward Y due to the mixing of the R component.

[0164] Therefore, in the projection display device of the comparative example, the color reproduction range is narrowed by the amount corresponding to the deviation Y.

[0165] To avoid the effects of color mixing, such as Fig.21 As shown, the period during which the laser light sources 151R, 151G, 151B, 152R, 152G, and 152B are turned on can be narrowed based on the end of the negative polarity writing period (-). However, if the period during which the laser light sources are turned on is shortened, the proportion of the period during which the laser light sources are turned on becomes smaller in the entire 1 frame period (1F), making it difficult to ensure the necessary brightness.

[0166] That is, in the comparative example, the securing of the color reproduction range and the securing of the brightness are in an inverse relationship.

[0167] In the comparative example, in order to visually confirm the image pixels of odd-numbered rows in color during the odd-numbered field period (Od-f) and visually confirm the image pixels of even-numbered rows in color during the even-numbered field period (Ev-f), the color components of the image pixels represented by the same row are different in consecutive unit periods. Therefore, color mixing occurs.

[0168] In order to avoid such color mixing, in this embodiment, Fig. 9 and Fig.12 As shown, the same color component in the image pixel is expressed continuously in odd and even rows. In addition, as in this embodiment, when the same color component is expressed continuously in odd and even rows, the shift interval of the optical path shift element 190 is 1 / 3 compared with the comparative example.

[0169] According to this embodiment, when the panel pixel a represents the R component of the image pixel in the even row and odd column, the G component is mixed due to the light emission in the unit period (Ev-f1), and when the panel pixel b represents the G component of the image pixel in the even row and even column, the R component is mixed.

[0170] However, according to this embodiment, unlike the comparative example, color mixing of G components into R components in odd rows and odd columns of panel pixel a and color mixing of R components into G components in odd rows and even columns of panel pixel b are avoided.

[0171] Therefore, in the present embodiment, the frequency of color mixture is halved compared to the comparative example, so that the influence on the color reproduction range can be reduced and the necessary brightness can be ensured.

[0172] The projection display device 1 according to the first embodiment can be variously modified or applied as described below.

[0173] First, regarding the arrangement of the panel pixels a of the liquid crystal panel 100 a and the panel pixels b of the liquid crystal panel 100 b with respect to the prism 180 , the following example can be given.

[0174] As in Fig.13 As in the first variation shown in the figure, the arrangement of the panel pixels b may be shifted downward by 0.5 pixels of the panel pixels relative to the arrangement of the panel pixels a.

[0175] In this configuration, in the unit period (Od-f1, Od-f2, Od-f3), the panel pixel a represents the image pixel of the odd row and odd column, and the panel pixel b represents the image pixel of the even row and odd column. In the unit period (Ev-f1, Ev-f2, Ev-f3), the panel pixel a represents the image pixel of the odd row and even column, and the panel pixel b represents the image pixel of the even row and even column. In addition, the processing circuit 21 controls the optical path shift element 190 so that the projection position in the unit period (Ev-f1, Ev-f2, Ev-f3) is shifted to the right by 0.5 pixels of the panel pixel from the reference position.

[0176] In addition, if Fig.14 As shown in the second variant, the arrangement of panel pixels b may be shifted to the right by 0.5 pixels of the panel pixels and to the bottom by 0.5 pixels relative to the arrangement of panel pixels a. In this configuration, in the unit period (Od-f1, Od-f2, Od-f3), panel pixels a may represent image pixels of odd rows and odd columns, and panel pixels b may represent image pixels of even rows and even columns. In the unit period (Ev-f1, Ev-f2, Ev-f3), panel pixels a may represent image pixels of odd rows and even columns, and panel pixels b may represent image pixels of even rows and odd columns. In addition, the processing circuit 21 controls the optical path shift element 190 so that the projection position in the unit period (Ev-f1, Ev-f2, Ev-f3) is shifted to the right by 0.5 pixels of the panel pixels, for example, from the reference position.

[0177] In addition, in this configuration, in the unit period (Od-f1, Od-f2, Od-f3), the panel pixel a represents the image pixel of the odd row and odd column, and the panel pixel b represents the image pixel of the even row and even column, and in the unit period (Ev-f1, Ev-f2, Ev-f3), the panel pixel a represents the image pixel of the even row and odd column, and the panel pixel b represents the image pixel of the odd row and even column. In addition, the processing circuit 21 controls the optical path shift element 190 so that the projection position in the unit period (Ev-f1, Ev-f2, Ev-f3) is shifted downward from the reference position by, for example, 0.5 pixels of the panel pixel.

[0178] In addition, regarding the order of the colors in the liquid crystal panel 100 b and the order of the light emission colors in the light source 152 , the following examples can be given.

[0179] For example, you can also Fig.15 As shown in the third variation example, in the unit period (Od-f2, Ev-f2, Od-f3 and Ev-f3), the panel pixel b in the liquid crystal panel 100b sequentially represents the B component (BO) of the image pixel in the odd row and even column, the B component (BE) of the image pixel in the even row and even column, the R component (RO) of the image pixel in the odd row and even column, and the R component (RE) of the image pixel in the even row and even column. For the light source 152, the processing circuit 21 controls the laser light source 152B to be turned on during each negative polarity writing period (-) of the unit period (Od-f2 and Ev-f2), and controls the laser light source 152R to be turned on during each negative polarity writing period (-) of the unit period (Od-f3 and Ev-f3).

[0180] In addition, for example, Fig.16 As shown in the fourth variation, the order of colors in the liquid crystal panel 100b is made the same as the order of colors in the liquid crystal panel 100a, and the order of light-emitting colors in the light source 152 is made the same as the order of light-emitting colors in the light source 151.

[0181] In addition, here, the order of the color sequence in the liquid crystal panel 100a and the order of the light emission colors in the light source 151 are the same as Fig. 9 Although there is no change compared to the first embodiment shown, the order of the colors in the liquid crystal panels 100 a and 100 b may be reversed, and the order of the light emission colors in the light sources 151 and 152 may be reversed.

[0182] In the first embodiment, the transmission image based on the liquid crystal panel 100a is an example of the first image light, the light source 151 is an example of the first light source, the R component is an example of the first color light component, the G component is an example of the second color light component, the B component is an example of the third color light component, the P polarized light is an example of the first polarized light, and the polarization optical system 160a is an example of the first polarization conversion member. That is, the device including the light source 151, the polarization optical system 160a, and the liquid crystal panel 100a is an example of the first image light emitting device.

[0183] In addition, the transmission image based on the liquid crystal panel 100b is an example of the second image light, the light source 152 is an example of the second light source, the S polarized light is an example of the second polarized light, and the polarization optical system 160b is an example of the second polarization conversion member. That is, the device including the light source 152, the polarization optical system 160b, and the liquid crystal panel 100b is an example of the second image light emitting device.

[0184] The prism 180 is an example of a synthetic optical system.

[0185] The unit period (Od-f1) is an example of the first unit period, the unit period (Ev-f1) is an example of the second unit period, the unit period (Od-f2) is an example of the third unit period, the unit period (Ev-f2) is an example of the fourth unit period, the unit period (Od-f3) is an example of the fifth unit period, and the unit period (Ev-f3) is an example of the sixth unit period.

[0186] In the first embodiment described above, color mixing occurs when representing image pixels in even-numbered rows, and does not occur when representing image pixels in odd-numbered rows. In other words, in the first embodiment, the location where color mixing occurs is fixed, and the color reproduction range of image pixels in even-numbered rows is narrower than the color reproduction range of image pixels in odd-numbered rows.

[0187] Therefore, a projection display device 1 according to a second embodiment in which this problem is eliminated will be described. In addition, the structure of the projection display device 1 according to the second embodiment is the same as that of the projection display device 1 according to the first embodiment, and only the operation is different. Therefore, with respect to the projection display device 1 according to the second embodiment, the operation will be mainly described.

[0188] Fig.17 It is a diagram for explaining the operation of the projection display device 1 according to the second embodiment during two frame periods.

[0189] In the second embodiment, instead of treating one frame period (1F) as one unit as in the first embodiment, two frame periods (2F) of an odd frame period (Odd_F) earlier in time and an even frame period (Even_F) later in time are treated as one unit for operation. Fig.17The time scale of the horizontal axis in the figure is relatively Fig. 9 The time scale of the horizontal axis is compressed to 1 / 2.

[0190] The odd-numbered frame period (Odd_F) in the second embodiment is the same as one frame period in the first embodiment.

[0191] In the even frame period (Even_F) of the second embodiment, the unit period (Od_f1) and the unit period (Ev_f1) in the odd frame period (Odd_F) are in a relationship of being switched in order, with the unit period (Ev_f1) being the earlier one in time and the unit period (Od_f1) being the later one in time. The unit period (Od_f2) and the unit period (Ev_f2) are also in a relationship of being switched in order, and the unit period (Od_f3) and the unit period (Ev_f3) are also in a relationship of being switched in order.

[0192] Fig.18 The diagrams show the optical responses of the panel pixel a of the liquid crystal panel 100a and the panel pixel b of the liquid crystal panel 100b in the odd-numbered frame period (Odd_F) and the even-numbered frame period (Even_F) in the projection display device 1 according to the second embodiment.

[0193] The optical response of panel pixel a and panel pixel b during the odd frame period (Odd_F) is Fig.12 Therefore, during an odd frame period (Odd_F), when panel pixel a represents the R component of an image pixel in an even row and an odd column, a mixed color of the G component is generated, and when panel pixel b represents the G component of an image pixel in an even row and an even column, a mixed color of the R component is generated.

[0194] On the other hand, during the even frame period (Even_F), the odd and even numbers in the unit period are swapped. Therefore, when the above-mentioned specific pattern is displayed, during the even frame period (Even_F), when the panel pixel a represents the R component in the image pixel of the odd row and odd column, the G component is mixed due to the light emission in the unit period (Ev-f2), and when the panel pixel b represents the G component of the image pixel of the odd row and even column, the R component is mixed.

[0195] As described above, in the second embodiment, color mixture occurs when image pixels of even-numbered rows are displayed in the odd-numbered frame period (Odd_F), and color mixture occurs when image pixels of odd-numbered rows are displayed in the even-numbered frame period (Even_F).

[0196] That is, in the second embodiment, the occurrence of color mixture is alternately switched between odd-numbered rows and even-numbered rows every 1 frame period (1F), so when looking at the entire 2 frame periods (2F), the influence of color mixture is averaged.

[0197] Therefore, in the second embodiment, the color reproduction range of the image pixels in the odd-numbered rows and the color reproduction range of the image pixels in the even-numbered rows are made substantially equal by averaging, thereby avoiding the situation in which the influence of color mixture is biased toward one side as in the first embodiment.

[0198] In the second embodiment, the odd-numbered frame period (Odd-F) is an example of the first frame period, and the even-numbered frame period (Even-F) is an example of the second frame period.

[0199] In the above-mentioned first embodiment and second embodiment (hereinafter referred to as "embodiment etc."), various modifications or applications are possible as follows.

[0200] In the embodiment, the earlier time in each unit period is set as the positive polarity writing period (+), and the later time is set as the negative polarity writing period (-), but they can also be switched. In the case where the earlier time is set as the writing period (-) and the later time is set as the writing period (+), in the later time writing period (+), the processing circuit 21 can control the laser light source to be turned on.

[0201] In the embodiments and the like, the liquid crystal panels 100 a and 100 b as image light emitting devices are of a transmissive type, but may be of a reflective type.

[0202] In addition, as an image light emitting device, in addition to this, it can also be applied to a reflector element, etc., in which the mirror (reflector) of the reflector element is tilted to a position corresponding to opening or closing, and the incident light is reflected in a specified direction only in either the opening or closing state.

[0203] According to the above-exemplified aspects, for example, the following aspects can be understood.

[0204] A projection display device of mode 1, the projection display device comprising: a first image light emitting device, which emits a first color light component and a second color light component in the first image light in a time-division manner; a second image light emitting device, which emits the first color light component and the second color light component in the second image light in a time-division manner; a synthesis optical system, which synthesizes the first image light and the second image light in a state where the second image light is shifted along a first direction relative to the first image light, and emits the synthesized light; an optical path shifting element, which shifts the optical path of the synthesized light emitted from the synthesis optical system;and a display control circuit, which controls the first image light emitting device, the second image light emitting device and the optical path shifting element, wherein one frame period includes a first unit period, a second unit period, a third unit period and a fourth unit period, and the display control circuit supplies, during the first unit period, to the first image light emitting device a data signal of the first color light component in the image pixels that are odd-numbered in a second direction intersecting the first direction of the image pixel data and arranged along the first direction, among the data signals corresponding to the grayscale levels specified by the image pixel data arranged in a matrix, and supplies to the first image light emitting device a data signal of the first color light component in the image pixels that are odd-numbered in a second direction intersecting the first direction of the image pixel data and arranged along the first direction, and supplies to the first image light emitting device a data signal of the first color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction, among the data signals corresponding to the grayscale levels specified by the image pixel data arranged in a matrix The data signal of one of the first color light component and the second color light component in the image pixels arranged in the first direction is supplied to the second image light emitting device, the optical path shifting element is controlled, the optical path is set to a reference position, and during the second unit period, the data signal of the first color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of one of the first color light component and the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device. The light emitting device controls the optical path shifting element to shift the optical path along the second direction, during the third unit, supplies the data signal of the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction to the first image light emitting device, supplies the data signal of the other of the first color light component and the second color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction to the second image light emitting device, controls the optical path shifting element to return the optical path to the reference position, during the fourth unit, supplies the data signal of the second color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction to the second image light emitting device, controls the optical path shifting element to return the optical path to the reference position, and during the fourth unit, supplies the data signal of the second color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction to the second image light emitting device. The data signal of the second color light component in the image pixels that are even-numbered in the second direction of the pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of the other of the first color light component and the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device, and the optical path shifting element is controlled to shift the optical path along the second direction, so that the first image light emitting device emits the first image light based on the supplied data signal, and the second image light emitting device emits the second image light based on the supplied data signal. ;

[0205] According to the projection display device of aspect 1, a high-resolution projection can be realized at low cost, and a narrowing of the color reproduction range can be suppressed.

[0206] In the projection display device of specific mode 2 of mode 1, in the synthetic optical system, the offset of the second image light relative to the first image light along the first direction is 0.5 pixels of the pixels in the first image light or the second image light, and the optical path shifting element shifts the optical path by the 0.5 pixels.

[0207] In the projection display device of specific mode 3 of mode 2, the first image light emitting device comprises: a first liquid crystal panel; a first light source, which emits light to the first liquid crystal panel; and a first polarization conversion component, which converts the light emitted by the first light source into a first polarized light, and the first polarized light is incident on the first liquid crystal panel, and the second image light emitting device comprises: a second liquid crystal panel; a second light source, which emits light to the second liquid crystal panel; and a second polarization conversion component, which converts the light emitted by the second light source into a second polarized light, and the second polarized light is incident on the second liquid crystal panel.

[0208] In a projection display device according to a specific aspect 4 of aspect 3, the first light source and the second light source are laser light sources that emit first light in a wavelength band including the first color light component and second light in a wavelength band including the second color light component.

[0209] In the projection display device of another specific mode 5 of mode 3, during the first unit period, the first liquid crystal panel emits the first color light component of the first image light by positive polarity writing and negative polarity writing respectively, and the second liquid crystal panel emits one of the first color light component and the second color light component of the second image light by positive polarity writing and negative polarity writing respectively, and during the second unit period, the first liquid crystal panel emits the first color light component of the first image light by positive polarity writing and negative polarity writing respectively, and the second liquid crystal panel emits the first color light component and the second color light component of the second image light by positive polarity writing and negative polarity writing respectively. One of the two color light components, during the third unit period, the first liquid crystal panel emits the second color light component of the first image light by positive polarity writing and negative polarity writing respectively, and the second liquid crystal panel emits the first color light component and the other of the second color light components of the second image light by positive polarity writing and negative polarity writing respectively, and during the fourth unit period, the first liquid crystal panel emits the second color light component of the first image light by positive polarity writing and negative polarity writing respectively, and the second liquid crystal panel emits the first color light component and the other of the second color light components of the second image light by positive polarity writing and negative polarity writing respectively.

[0210] In the projection display device of specific mode 6 of mode 5, during the first unit period to the fourth unit period, when the time order of one of the positive polarity writing and the negative polarity writing is earlier, the display control circuit controls the first light source and the second light source to be in the off state during the writing period of one of the positive polarity writing and the negative polarity writing, and controls the first light source and the second light source to be in the on state during the writing period of the other of the positive polarity writing and the negative polarity writing.

[0211] In the projection display device of the specific other mode 7 of mode 1, the 1 frame period is the 1st frame period, the 1st frame period is followed by the 2nd frame period, and in the 2nd frame period, the 2nd unit period, the 1st unit period, the 4th unit period and the 3rd unit period are arranged in time order.

[0212] In another specific embodiment 8 of embodiment 1, in the projection display device, the first image light emitting device also emits the third color light component in the first image light in a time-division manner, the second image light emitting device also emits the third color light component in the second image light in a time-division manner, and the one frame period also includes a fifth unit period and a sixth unit period. During the fifth unit period, the display control circuit supplies the data signal of the third color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction to the first image light emitting device, and supplies the data signal of the third color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction to the first image light emitting device, and supplies the data signal of the third color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction to the second image light emitting device. The data signal of the third color light component in the image pixel is supplied to the second image light emitting device, and the optical path shifting element is controlled to return the optical path to the reference position. During the sixth unit period, the data signal of the third color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of the third color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device, and the optical path shifting element is controlled to shift the optical path along the second direction.

Claims

1. A projection display device, characterized in that: The projection display device comprises: a first image light emitting device for emitting a first color light component and a second color light component of the first image light in a time-division manner; a second image light emitting device for emitting the first color light component and the second color light component of the second image light in a time-division manner; a synthesis optical system for synthesizing the first image light and the second image light in a state where the second image light is shifted in a first direction relative to the first image light, and emitting the synthesized light; an optical path shifting element that shifts the optical path of the synthesized light emitted from the synthesizing optical system; as well as a display control circuit, which controls the first image light emitting device, the second image light emitting device and the optical path shifting element, One frame period includes a first unit period, a second unit period, a third unit period, and a fourth unit period. The display control circuit During the first unit period, among the data signals corresponding to the grayscale levels specified by the image pixel data arranged in a matrix, the data signals of the first color light components in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction and are arranged in the first direction are supplied to the first image light emitting device, and the data signals of one of the first color light components and the second color light components in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction are supplied to the second image light emitting device, and the optical path shifting element is controlled to set the optical path to a reference position, During the second unit period, the data signal of the first color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of one of the first color light component and the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device, and the optical path shifting element is controlled to shift the optical path along the second direction. During the third unit period, the data signal of the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of the other of the first color light component and the second color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device, and the optical path shifting element is controlled to return the optical path to the reference position. During the fourth unit period, the data signal of the second color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of the other of the first color light component and the second color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device, and the optical path shifting element is controlled to shift the optical path along the second direction. The first image light emitting device emits the first image light based on the supplied data signal, and the second image light emitting device emits the second image light based on the supplied data signal.

2. The projection display device according to claim 1, characterized in that: In the synthetic optical system, an amount of displacement of the second image light relative to the first image light along the first direction is 0.5 pixels of pixels in the first image light or the second image light, The optical path shifting element shifts the optical path by the 0.5 pixel.

3. The projection display device according to claim 2, characterized in that: The first image light emitting device comprises: 1st liquid crystal panel; a first light source that emits light toward the first liquid crystal panel; and a first polarization conversion component that converts the light emitted by the first light source into a first polarized light, The first polarized light is incident on the first liquid crystal panel. The second image light emitting device comprises: The second liquid crystal panel; a second light source that emits light toward the second liquid crystal panel; and a second polarization conversion component that converts the light emitted by the second light source into a second polarized light, The second polarized light is incident on the second liquid crystal panel.

4. The projection display device according to claim 3, characterized in that: The first light source and the second light source are laser light sources that emit first light in a wavelength band including the first color light component and second light in a wavelength band including the second color light component.

5. The projection display device according to claim 3, characterized in that: During the first unit period, the first liquid crystal panel emits the first color light component of the first image light by positive polarity writing and negative polarity writing, and the second liquid crystal panel emits one of the first color light component and the second color light component of the second image light by positive polarity writing and negative polarity writing, respectively. During the second unit period, the first liquid crystal panel emits the first color light component of the first image light by positive polarity writing and negative polarity writing, and the second liquid crystal panel emits one of the first color light component and the second color light component of the second image light by positive polarity writing and negative polarity writing, respectively. During the third unit period, the first liquid crystal panel emits the second color light component of the first image light by positive polarity writing and negative polarity writing, and the second liquid crystal panel emits the other of the first color light component and the second color light component of the second image light by positive polarity writing and negative polarity writing, respectively. During the fourth unit period, the first liquid crystal panel emits the second color light component of the first image light by positive polarity writing and negative polarity writing respectively, and the second liquid crystal panel emits the first color light component and the other of the second color light component of the second image light by positive polarity writing and negative polarity writing respectively.

6. The projection display device according to claim 5, characterized in that: During the first unit period to the fourth unit period, when the time order of one of the positive polarity writing and the negative polarity writing is earlier, the display control circuit controls the first light source and the second light source to be in the off state during the writing period of one of the positive polarity writing and the negative polarity writing, and controls the first light source and the second light source to be in the on state during the writing period of the other of the positive polarity writing and the negative polarity writing.

7. The projection display device according to claim 1, characterized in that: The 1 frame period is the 1st frame period, The first frame period is followed by a second frame period. The second frame period includes the second unit period, the first unit period, the fourth unit period, and the third unit period in chronological order.

8. The projection display device according to claim 1, characterized in that: The first image light emitting device further emits the third color light component in the first image light in a time-division manner. The second image light emitting device further emits the third color light component in the second image light in a time-division manner. The one frame period further includes a fifth unit period and a sixth unit period. The display control circuit During the fifth unit, the data signal of the third color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of the third color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device, and the optical path shifting element is controlled to return the optical path to the reference position. During the sixth unit period, the data signal of the third color light component in the image pixels that are even-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the first image light emitting device, and the data signal of the third color light component in the image pixels that are odd-numbered in the second direction of the image pixel data and arranged along the first direction is supplied to the second image light emitting device, and the optical path shifting element is controlled to shift the optical path along the second direction.

Images