Projection type display device

Abstract

To achieve high-resolution color display at an inexpensive price.SOLUTION: A projection type display device includes: a liquid crystal panel 100a that includes a sub-pixel C and a sub-pixel R arranged side by side with the sub-pixel C in the right direction, and creates a first image; a liquid crystal panel 100b that includes a sub-pixel R and a sub-pixel C arranged side by side with the sub-pixel R in the right direction, and creates a second image; a prism 180 that combines the first image and the second image and emits a resultant image; an optical path shift element 190 that shifts an optical path of the emitted image from the prism 180; and a display control circuit 20. The display control circuit 20 divides a data signal corresponding to a gradation level designated by image pixel data for an odd number field period (Od-f) and an even number field period (Ev-f), and supplies the resultant signals to the liquid crystal panels 100a, 100b. The display control circuit controls the optical path shift element 190 to shift the optical path in the even number field period (Ev-f) in a downward direction relative to the optical path in the odd number field period (Od-f).SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] In a projection display device that projects image light created by a liquid crystal panel or the like onto a screen or the like, a technology has been proposed in which a first optical image generated by a first optical system and a second optical image generated by a second optical system are shifted and combined, and then projected to achieve high resolution (see, for example, Patent Document 1). Specifically, to realize a color display in the above technology, the following configuration is used: in the first optical system, images from three liquid crystal panels are combined by a first dichroic prism to form a first optical image, in the second optical system, images from three liquid crystal panels are combined by a second dichroic prism to form a second optical image, and the first and second optical images are further combined by a prism. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-181670 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above technology requires not only six liquid crystal panels, but also three prisms for synthesizing the optical images, which means that in order to achieve high-resolution color display with the above technology, not only does the configuration become more complex, but it also leads to high costs. [Means for solving the problem]

[0005] In order to solve the above problem, a projection type display device according to one aspect of the present disclosure includes a first sub-pixel that emits a first color light and a second sub-pixel that is arranged next to the first sub-pixel in a first direction and emits a second color light, the first image light emitting device emitting a first image light including the first color light emitted from the first sub-pixel and the second color light emitted from the second sub-pixel, a third sub-pixel that emits the second color light and a fourth sub-pixel that is arranged next to the third sub-pixel in the first direction and emits the first color light, the second image light emitting device emitting a second image light including the second color light emitted from the third sub-pixel and the first color light emitted from the fourth sub-pixel, and the first image light output device and the second image light output device, and a display control circuit that controls the first image light output device, the second image light output device, and the light path shift element, wherein the display control circuit supplies a data signal corresponding to a gradation level specified by video pixel data to the first image light output device and the second image light output device, for a first field period and a second field period, and controls the light path shift element to shift the light path in the second field period relative to the light path in the first field period in a second direction intersecting the first direction. [Brief description of the drawings]

[0006] [Figure 1] FIG. 1 is a diagram showing a projection type display device according to a first embodiment. [Diagram 2] FIG. 1 is a block diagram showing a configuration of a projection display device. [Diagram 3] FIG. 1 is a diagram showing an arrangement of image pixels in a projection display device. [Figure 4] FIG. 1 is a diagram showing an arrangement of panel pixels in a projection display device. [Diagram 5] FIG. 1 is a perspective view showing a configuration of a liquid crystal panel in a projection display device. [Figure 6] FIG. 2 is a cross-sectional view showing the structure of a liquid crystal panel. [Figure 7] FIG. 2 is a block diagram showing an electrical configuration of a liquid crystal panel. [Figure 8] FIG. 2 is a diagram showing a configuration of a pixel circuit in a liquid crystal panel. [Figure 9] FIG. 2 is a diagram for explaining the operation of a projection display device during one frame period. [Figure 10] FIG. 2 is a diagram showing the relationship between video pixels, panel pixels, and projection positions during one frame period. [Figure 11] FIG. 11 is a diagram showing an arrangement of panel pixels according to a second embodiment. [Figure 12] FIG. 2 is a diagram for explaining the operation of a projection display device during one frame period. [Figure 13] FIG. 13 is a diagram showing an arrangement of panel pixels according to a third embodiment. [Figure 14] FIG. 2 is a diagram for explaining the operation of a projection display device during one frame period. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] Hereinafter, a projection display device according to an embodiment will be described with reference to the drawings. In each drawing, the dimensions and scale of each part are appropriately different from the actual ones. In addition, since the embodiments described below are preferred specific examples, various technically preferable limitations are attached, but the scope of the present disclosure is not limited to these forms unless otherwise specified in the following description to the effect that the present disclosure is limited.

[0008] 1 is a diagram showing the optical configuration of a projection display device 1 according to a first embodiment. The projection display device 1 includes liquid crystal panels 100a and 100b, light sources 151 and 152, polarization optical systems 160a and 160b, a prism 180, a light path shift element 190, and a projection lens 200.

[0009] The light source 151 includes laser light sources 151R, 151G, and 151B. Of these, the laser light source 151R emits light including a red wavelength range, the laser light source 151G emits light including a green wavelength range, and the laser light source 151B emits light including a blue wavelength range. The polarization optical system 160a diffuses the light emitted from the laser light sources 151R, 151G, and 151B, forms it into a substantially parallel light beam with a substantially uniform illuminance, converts the light beam into P-polarized light, and emits it toward the transmissive liquid crystal panel 100a. Note that converting to P-polarized light also includes transmitting the P-polarized light. A polarizing plate 171a is provided between the exit surface of the polarization optical system 160a and the entrance surface of the liquid crystal panel 100a, and a polarizing plate 172a is provided on the exit surface of the liquid crystal panel 100a. 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 light component that has not been modulated by the liquid crystal panel 100a is blocked by the polarizing plate 172a.

[0010] Like the light source 151, the light source 152 includes laser light sources 152R, 152G, and 152B. Of these, the laser light source 152R emits light including a red wavelength range, the laser light source 152G emits light including a green wavelength range, and the laser light source 152B emits light including a blue wavelength range. The polarization optical system 160b diffuses the light emitted from the laser light sources 152R, 152G, and 152B, shapes it into a substantially parallel light beam with a substantially uniform illuminance, converts the light beam into S-polarized light, and emits it toward the transmissive liquid crystal panel 100b. Note that converting to S-polarized light also includes transmitting the S-polarized light. A polarizing plate 171b is provided between the exit surface of the polarization optical system 160b and the entrance surface of the liquid crystal panel 100b, and a polarizing plate 172b is provided on the exit surface of the liquid crystal panel 100b. 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 light component that has not been modulated by the liquid crystal panel 100b is blocked by the polarizing plate 172b.

[0011] The liquid crystal panels 100a and 100b each have a plurality of sub-pixel circuits, as described below. Each of the plurality of sub-pixel circuits includes 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 incident light according to the voltage of the data signal. This modulation changes the amount of light passing through the polarizing plate 172a, that is, the transmittance changes. Therefore, a transmission image is generated in the liquid crystal panel 100a by individually controlling the modulation by the liquid crystal elements based on the data signal. Similarly, a transmission image is generated in the liquid crystal panel 100b.

[0012] The transmitted image of liquid crystal panel 100a is incident on prism 180 from the 9 o'clock direction in the figure, and the transmitted image of liquid crystal panel 100b is incident on prism 180 from the 12 o'clock direction. At bonding surface 182 of prism 180, S-polarized light of the transmitted image of liquid crystal panel 100a is transmitted and travels straight, and P-polarized light of the transmitted image of liquid crystal panel 100b is reflected. Therefore, the prism 180 combines the transmitted image of the liquid crystal panel 100a and the transmitted image of the liquid crystal panel 100b, and the combined image is output in the 3 o'clock direction. The combined image by the prism 180 is incident on the projection lens 200 via the optical path shift element 190. The projection lens 200 enlarges and projects the composite image via the optical path shift element 190 onto the screen Scr. The light path shift element 190 shifts the light path of the light emerging from the prism 180, and shifts the composite image projected onto the screen Scr in the vertical direction relative to the projection surface.

[0013] The transmitted image by the liquid crystal panel 100a travels straight whereas the transmitted image by the liquid crystal panel 100b is reflected at the joint surface 182 of the prism 180. Therefore, the transmitted image by the liquid crystal panel 100b is generated in a left-right inverted manner with respect to the transmitted image by the liquid crystal panel 100a.

[0014] 2 is a block diagram showing the electrical configuration 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 above-mentioned liquid crystal panels 100a and 100b, light sources 151 and 152, and light path shift element 190.

[0015] Video data Vid_in is supplied from a higher-level device such as a host device (not shown) in synchronization with a synchronization signal Sync. The video data Vid_in specifies the gradation level of pixels in an image constituting one frame period of a video, for example, by 8 bits for each of RGB.

[0016] Note that the pixels of an image specified by the video data Vid_in are referred to as video pixels, and data specifying the gradation levels of the video pixels are referred to as video pixel data, but there is no particular distinction between video pixels and video pixel data. Also, the pixels of an image before or after synthesis by the liquid crystal panel 100a or 100b are referred to as panel pixels. The position of the panel pixel shifted by the light path shift element 190 and projected onto the screen Scr is referred to as the projection position. In the liquid crystal panels 100a and 100b, the panel pixels are arranged in a matrix in a plan view. In the embodiment, the arrangement of the video pixels specified by the video data Vid_in is, for example, twice as large in the vertical direction and twice as large in the horizontal direction as the arrangement of the panel pixels of the liquid crystal panels 100a or 100b.

[0017] The synchronization signal Sync includes a vertical synchronization signal that instructs the start of vertical scanning of the video data Vid_in, a horizontal synchronization signal that instructs the start of horizontal scanning, and a clock signal that indicates the timing of one video pixel in the video data Vid_in.

[0018] The display control circuit 20 includes a processing circuit 21 and conversion circuits 22a and 22b. The processing circuit 21 controls the conversion circuits 22a and 22b, the liquid crystal panels 100a and 100b, and the light sources 151 and 152 for each unit period, which will be described later, based on the synchronization signal Sync, and controls the light path shift element 190 for each field period, which will be described later. The light path shift element 190 shifts the projection position according to the control by the processing circuit 21.

[0019] FIG. 3 is a diagram showing a part of the arrangement of image pixels represented by the image data Vid_in. In the figure, for the sake of convenience, codes A1 to A4 are assigned to the first row and B1 to B4 are assigned to the second row to distinguish between image pixels in an image represented by the video data Vid_in.

[0020] Returning to Fig. 2 for explanation, of the video data Vid_in, the video pixel data that specifies the gradation level of the video pixel represented by the liquid crystal panel 100a is denoted as Va, and the video pixel data that specifies the gradation level of the video pixel represented by the liquid crystal panel 100b is denoted as Vb.

[0021] The conversion circuit 22a temporarily stores the video pixel data Va for one or more frame periods in an internal buffer, then reads out the video pixel data of the color component corresponding to the unit period, converts it into an analog voltage data signal Vid_a of a polarity corresponding to the writing period, and supplies it to the liquid crystal panel 100a. The conversion circuit 22b differs from the conversion circuit 22a only in the video pixel data to be converted, and the rest is common to the conversion circuit 22a. That is, the conversion circuit 22b temporarily stores the video pixel data Vb, reads out the video pixel data of the color component corresponding to the unit period, converts it into an analog voltage data signal Vid_b of a polarity corresponding to the writing period of the unit period, and supplies it to the liquid crystal panel 100b. It should be noted that the gradation levels of the image pixels designated by the image pixel data Va and Vb will be described later.

[0022] FIG. 4 is a diagram showing panel pixels corresponding to the arrangement of video pixels in FIG. 3, extracted from the panel pixels of liquid crystal panel 100a and the panel pixels of liquid crystal panel 100b. For ease of explanation, a panel pixel of the liquid crystal panel 100a is referred to as a panel pixel a, and a panel pixel of the liquid crystal panel 100b is referred to as a panel pixel b. In order to distinguish panel pixel a in the array in the upper left column, the symbols a1 and a2 are given for convenience, and similarly, in order to distinguish panel pixel b in the array in the upper right column, the symbols b1 and b2 are given for convenience.

[0023] In this embodiment, the panel pixels a and b are each approximately square in plan view. As shown in the figure, the panel pixel a is composed of two sub-pixels that are approximately equally divided in the vertical direction. In detail, the panel pixel a is composed of a left sub-pixel R and a right sub-pixel C in the figure. The panel pixel b is similarly composed of two sub-pixels that are approximately equally divided in the vertical direction. In detail, the panel pixel b is composed of a left sub-pixel C and a right sub-pixel R. That is, the two sub-pixels in the panel pixels a and b are symmetrical with respect to the dividing line of the panel pixels.

[0024] The subpixel R is red and transmits red (R) component light when white light is incident on it, while the subpixel C is cyan and transmits green (G) component light and blue (B) component light when white light is incident on it. In particular, cyan is a complementary color to red, and mixing cyan and red results in an achromatic color. Even more particularly, when displaying colors using the three colors red, green, and blue, mixing red with the other two colors green and blue results in cyan.

[0025] The arrangement of panel pixels a and b with respect to prism 180 has the relationship shown in the lower column of Fig. 4. In detail, when viewed from the exit surface of prism 180, sub-pixel R of panel pixel b overlaps sub-pixel C of panel pixel a, and sub-pixel C of panel pixel b overlaps sub-pixel R of panel pixel a.

[0026] Next, the liquid crystal panels 100a and 100b will be described. The liquid crystal panels 100a and 100b have a common structure, with the exception of the arrangement of the subpixels C and R. Thus, the liquid crystal panels 100a and 100b will be generally described as 100 without specifying which one is which.

[0027] FIG. 5 is a perspective view showing the liquid crystal panel 100, and FIG. 6 is a cross-sectional view taken along line Hh in FIG. As shown in these figures, in the liquid crystal panel 100, an element substrate 101 on which a pixel electrode 118 is provided and an opposing substrate 102 on which a common electrode 108 is provided are bonded together with a sealant 90 so that their electrode forming surfaces face each other while maintaining a certain gap, and liquid crystal 105 is filled in this gap.

[0028] The element substrate 101 and the counter substrate 102 are each made of a substrate having optical transparency, such as glass or quartz. As shown in Fig. 5, one side of the element substrate 101 protrudes from the counter substrate 102. A plurality of terminals 106 are provided in this protruding area along the horizontal direction in the figure. One end of an FPC (Flexible Printed Circuits) substrate (not shown) is connected to the plurality of terminals 106. The other end of the FPC substrate is connected to the display control circuit 20, and the above-mentioned various signals are supplied thereto.

[0029] On the surface of the element substrate 101 facing the counter substrate 102, pixel electrodes 118 are provided by patterning a transparent conductive layer such as ITO (Indium Tin Oxide). Although not specifically shown, the counter substrate 102 is provided with color filters that color the pixels cyan or blue in correspondence with the sub-pixels of the panel pixels.

[0030] 7 is a block diagram showing the electrical configuration 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 on the periphery of the display area 10.

[0031] In the display region 10, pixel circuits 110 are arranged in a matrix. In detail, in the display region 10, a plurality of scanning lines 12 are provided extending in the horizontal direction in the figure, and a plurality of data lines 14 are provided extending in the vertical direction and electrically insulated from the scanning lines 12.

[0032] The pixel circuits 110 are provided at the intersections of one scanning line 12 and two data lines. If the number of scanning lines 12 is m and the number of data lines 14 is (2n), the pixel circuits 110 are arranged in a matrix of m rows and n columns. Both m and n are integers of 2 or more. Since the video pixels are arranged twice as large vertically and twice as large horizontally as the panel pixel arrangement, the video pixel arrangement is (2m) rows by (2n) columns. In addition, in order to distinguish the rows of the matrix in the scanning lines 12 and the pixel circuits 110, they may be referred to as 1st, 2nd, 3rd, ..., (m-1), 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 may be referred to as 1st, 2nd, 3rd, ..., 2(n-1), (2n)th columns from the left in the figure.

[0033] One pixel circuit 110 includes sub-pixel circuits 110a and 110b. In the liquid crystal panel 100a, the subpixel circuit 110a corresponds to the subpixel C, and the subpixel circuit 110b corresponds to the subpixel R. In the liquid crystal panel 100b, the subpixel circuit 110a corresponds to the subpixel R, and the subpixel circuit 110b corresponds to the subpixel C.

[0034] "Row" and "column" are relative concepts, and if one of the horizontal (left-right) direction and the vertical (up-down) direction is defined as a "row", the other of the horizontal and vertical directions is defined as a "column". However, for the sake of convenience, in this description, the horizontal direction in which the scanning lines 12 extend is defined as a "row", and the vertical direction in which the data lines 14 extend is defined as a "column". The same is true for odd-numbered rows and even-numbered rows, and odd-numbered columns and even-numbered columns, and if one of the horizontal and vertical directions is defined as odd-numbered rows and even-numbered rows, the other of the horizontal and vertical directions is defined as odd-numbered columns and even-numbered columns.

[0035] An integer i between 1 and m may be used to generally describe a row of scan lines 12, panel pixels, or video pixels, and an integer j between 1 and n may be used to generally describe a column of data lines 14, panel pixels, or video pixels.

[0036] 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 rows in accordance with the control by the display control circuit 20, and sets the scanning signal to the selected scanning line 12 to H level. Note that the scanning line driving circuit 130 sets the scanning signal to the scanning lines 12 other than the selected scanning line 12 to L level. The data line driving circuit 140 outputs the data signal supplied from the corresponding conversion circuit, either 22a or 22b, via the data line 14 to the sub-pixel circuits 110a and 110b located on the scanning line 12 during the period when the scanning signal to the scanning line 12 is at H level.

[0037] FIG. 8 is a diagram showing an equivalent circuit of the sub-pixel circuits 110a and 110b corresponding to the intersections of the twelve scanning lines 12 and two adjacent data lines 14. In FIG. The sub-pixel circuits 110a and 110b are electrically identical, with the exception that the colors of the corresponding color filters are different. Therefore, the sub-pixel circuits 110a and 110b will be described by taking the sub-pixel circuit 110a as an example.

[0038] 8, the subpixel circuit 110a includes a transistor 116 and a liquid crystal element 120. The transistor 116 is, for example, an n-channel thin film transistor. In the subpixel circuit 110a, a gate node of the transistor 116 is connected to the scanning line 12, a source node of the transistor 116 is connected to the data line 14, and a drain node of the transistor 116 is connected to a pixel electrode 118 that is rectangular in plan view.

[0039] A common electrode 108 is provided in common to all of the sub-pixel circuits 110a and 110b so as to face the pixel electrode 118. A voltage LCcom is applied to the common electrode 108. Then, as described above, liquid crystal 105 is sandwiched between the pixel electrode 118 and the common electrode 108. Therefore, the sub-pixel circuits 110a and 110b each constitute a liquid crystal element 120 in which the liquid crystal 105 is sandwiched between the pixel electrode 118 and the common electrode 108. Although omitted in Fig. 8, a storage capacitor is provided in parallel with the liquid crystal element 120. One end of the storage capacitor is connected to the pixel electrode 118, and the other end is connected to a capacitance line. A time-constant voltage, for example, a voltage LCcom that is the same as the voltage applied to the common electrode 108, is applied to the capacitance line.

[0040] When the scanning signal of a scanning line 12 becomes H level, the transistor 116 of the sub-pixel circuit 110a provided corresponding to the scanning line 12 becomes ON state. When the transistor 116 becomes ON state, the data line 14 and the pixel electrode 118 become electrically connected, so that the data signal supplied to the data line 14 reaches the pixel electrode 118 via the transistor 116 that has become ON state. When the scanning line 12 becomes L level, the transistor 116 becomes OFF state, but the voltage of the data signal that has reached the pixel electrode 118 is held by the capacitive and storage capacitance of the liquid crystal element 120.

[0041] As is well known, in the liquid crystal element 120, the orientation of the liquid crystal molecules changes in response to the electric field generated by the pixel electrode 118 and the common electrode 108. Therefore, the liquid crystal element 120 has a transmittance that corresponds to the effective value of the applied voltage. In addition, the region that functions as a subpixel in the liquid crystal element 120, i.e., the region that has a transmittance according to the effective value of the voltage, is the region where the pixel electrode 118 overlaps with the common electrode 108 when the element substrate 101 and the counter substrate 102 are viewed in a plan view. Since the pixel electrode 118 is rectangular in a plan view, the shape of the subpixel is also rectangular. In addition, in this embodiment, the liquid crystal 105 is of a VA (Vertical Alignment) type, and is in a normally black mode in which the transmittance is at a minimum when the voltage applied to the liquid crystal element 120 is zero, and the transmittance increases as the applied voltage increases. Although the subpixel circuit 110a has been described here, the liquid crystal element 120 in the subpixel circuit 110b also has a transmittance that corresponds to the effective value of the applied voltage.

[0042] A writing operation for supplying data signals to pixel electrodes 118 of liquid crystal elements 120 is performed in the order of 1st, 2nd, 3rd, ..., mth rows. As a result, voltages corresponding to the data signals are held in the order of 1st, 2nd, 3rd, ..., mth rows in the liquid crystal elements 120 of subpixel circuits 110a and 110b arranged in m rows x (2n) columns, and each liquid crystal element 120 attains a target transmittance.

[0043] FIG. 9 is a diagram for explaining the operation of the projection display device 1 according to the first embodiment. As shown in FIG. 9, in this embodiment, one frame period (1F) is divided into a temporally earlier odd-numbered field period (Od-f) and a temporally later even-numbered field period (Ev-f).

[0044] One frame period (1F) is the period during which one frame of an image represented by video data Vid_in is supplied, and corresponds to one cycle of 16.7 milliseconds when the frequency of the vertical synchronizing signal included in the synchronizing signal Sync is 60 Hz. The odd field period (Od-f) is a period during which the combined panel pixels a and b represent odd-numbered rows of video pixels. The even field period (Ev-f) is a period during which the combined panel pixels a and b represent even-numbered rows of video pixels. If one frame period (1F) is 16.7 milliseconds, then the odd field period (Od-f) and even field period (Ev-f) are half that, or 8.33 milliseconds.

[0045] The odd-numbered field period (Od-f) is divided into a unit period (OfL-GR) and a unit period (OfL-B). A unit period (OfL-GR) is a period during which the left sub-pixel C of panel pixel a expresses the green component (G-OO) of the image pixels in the odd rows and odd columns, and the right sub-pixel R of panel pixel a expresses the red component (R-OO) of the image pixels in the same row and one adjacent even column. In addition, the same unit period is the period during which the left sub-pixel R of panel pixel b represents the red component (R-OE) of the image pixels in the odd rows and odd columns, and the period during which the right sub-pixel C of panel pixel b represents the green component (G-OE) of the image pixels in the same row and one adjacent even column.

[0046] A unit period (OfL-B) is a period during which sub-pixel C in panel pixel a represents the blue component (B-OO) of the image pixels in odd rows and odd columns, and sub-pixel R in panel pixel a represents black (Blk), which does not contribute to the display. In addition, the same unit period is a period during which sub-pixel R in panel pixel b represents black (Blk), and a period during which sub-pixel C in panel pixel b represents the blue component (B-OE) of the image pixels in odd rows and even columns.

[0047] The even field period (Ev-f) is divided into a unit period (EfL-GR) and a unit period (EfL-B). The unit period (EfL-GR) is a period during which the sub-pixel C in the panel pixel a expresses the green component (G-EO) of the image pixels in the even rows and odd columns, and the sub-pixel R in the panel pixel a expresses the red component (R-EO) of the image pixels in the same row and the adjacent even column. In addition, the same unit period is a period during which sub-pixel R in panel pixel b expresses the red component (R-EE) of the image pixels in the even rows and odd columns, and a period during which sub-pixel C in panel pixel b expresses the green component (G-EE) of the image pixels in the same row and one adjacent even column.

[0048] The unit period (EfL-B) is a period during which the sub-pixel C in the panel pixel a expresses the blue component (B-EO) of the image pixels in the even rows and odd columns, and the sub-pixel R in the panel pixel a expresses black (Blk). In addition, the same unit period is a period during which sub-pixel R in panel pixel b represents black (Blk), and a period during which sub-pixel C in panel pixel b represents the blue component (B-EE) among the image pixels in even rows and even columns.

[0049] A subpixel "expresses" a certain video pixel means that the liquid crystal element 120 of the subpixel has a transmittance corresponding to the gray level (video pixel data) of the video pixel. In particular, when a subpixel expresses black (Blk), a data signal with the lowest gray level is written to the subpixel, resulting in the lowest transmittance. If the odd field period (Od-f) and the even field period (Ev-f) are 8.33 milliseconds, then the unit periods (OfL-GR, OfL-B, EfL-GR and EfL-B) are each half that, 4.17 milliseconds. Since the liquid crystal element 120 needs to be driven by an alternating current, each unit period (OfL-GR, OfL-B, EfL-GR, and EfL-B) is divided into positive and negative polarity write periods (not shown). That is, each unit period (OfL-GR, OfL-B, EfL-GR, and EfL-B) is divided into a write period for writing a positive polarity data signal and a write period for writing a negative polarity data signal.

[0050] The processing circuit 21 controls the light path shift element 190 as follows. That is, the processing circuit 21 sets the projection position by the light path shift element 190 to a first point P1 of the reference position in the odd field period (Od-f) and to a second point P2 in the even field period (Ev-f). The second point P2 is a point shifted downward by 0.5 panel pixels from the first point P1. In detail, when the odd field period (Od-f) passes from the even field period (Ev-f), the processing circuit 21 controls the light path shift element 190 to shift the projection position downward by 0.5 panel pixels to the second point P2. When the odd field period (Od-f) passes from the even field period (Ev-f), the processing circuit 21 controls the light path shift element 190 to shift the projection position upward by 0.5 panel pixels to return to the first point P1, which is the reference position.

[0051] The downward direction is the vertical scanning direction, that is, the direction in which the scanning lines 12 are selected in sequence. In addition, in Fig. 9, when the control signal to the light path shift element 190 is at H level, the projection position is the first point P1 of the reference position, and when it is at L level, the projection position is the second point P2.

[0052] The processing circuit 21 controls the light sources 151 and 152 as follows. In detail, in the unit period (OfL-GR) and the unit period (EfL-GR), the processing circuit 21 controls the laser light sources 151R, 152R, 151G, and 152G to be in the on state, and controls the other laser light sources to be in the off state. Note that the on state of a laser light source refers to a state in which the laser light source emits light, and the off state of a laser light source refers to a state in which the laser light source does not emit light. Furthermore, 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 in the unit period (OfL-B) and the unit period (EfL-B).

[0053] FIG. 10 is a diagram showing how panel pixels a and b are expressed at which projection positions in the first embodiment. In detail, the upper left column of Fig. 11 shows the color components of the video pixels represented by panel pixels a1 and a2 in the odd field period (Od-f), the upper right column shows the color components of the video pixels represented by panel pixels b1 and b2 in the odd field period (Od-f), the middle left column of Fig. 11 shows the color components of the video pixels represented by panel pixels a1 and a2 in the even field period (Ev-f), and the middle right column shows the color components of the video pixels represented by panel pixels b1 and b2 in the even field period (Ev-f).

[0054] In the unit period (OfL-GR) and the unit period (EfL-GR), when the laser light sources 151R, 152R, 151G, and 152G are turned on, yellow light is incident on the liquid crystal panels 100a and 100b, respectively. When the yellow light is incident, the subpixel C transmits the green component, and the subpixel R transmits the red component. In the unit period (OfL-B) and the unit period (EfL-B), when the laser light sources 151B and 152B are turned on, blue light is incident on the liquid crystal panels 100a and 100b, respectively. Even if blue light is incident, the subpixel R expresses black (Blk) and does not contribute to the display. On the other hand, when blue light is incident, the subpixel C transmits the blue component.

[0055] Next, how the color components expressed by the panel pixels a and b are visually recognized by a user will be described.

[0056] In the unit period (OfL-GR), yellow light is incident on the liquid crystal panels 100a and 100b. 10, of the panel pixel a1 in row i and column j, subpixel C represents the green component (G) of the video pixel in the odd-numbered row and column (2i-1), specifically, in row (2i-1) and column (2i-1), and subpixel R represents the red component (R) of the video pixel in row (2i-1) and column (2j). Therefore, of the incident yellow light, the green component is modulated by subpixel C and the red component is modulated by subpixel R, and each is visually recognized by the user.

[0057] In the unit period (OfL-B), blue light is incident on the liquid crystal panels 100a and 100b. In the unit period (OfL-B), of the panel pixel a1, the subpixel C expresses the blue component (B) of the image pixel in the (2i-1) row and (2j-1) column, and the subpixel R expresses black (Blk). Therefore, the component of the incident blue light is modulated by the subpixel C and is visually recognized by the user, but the subpixel R to which the blue light is incident is not visually recognized by the user.

[0058] As shown in the upper left and upper right columns of Figure 10, in a unit period (OfL-GR), of the panel pixel b1 in row i and column j, sub-pixel R represents the red component (R) of the video pixel in the odd row and even column, specifically, row (2i-1) column (2j), and sub-pixel C represents the green component (G) of the video pixel in row (2i-1) column (2j). In the unit period (OfL-B), in the panel pixel b1, the subpixel R expresses black (Blk), and the subpixel C expresses the blue component (B) of the video pixel in the (2i-1)th row and (2j)th column.

[0059] In this way, of the image pixel in row (2i-1) and column (2j-1), the green component (G) and blue component (B) are represented by the sub-pixel C to the left of panel pixel a1 in row i and column j, and the R component is represented by the sub-pixel R to the left of panel pixel b1 in row i and column j. For this reason, when looking at the unit period (OfL-GR) and the unit period (OfL-B) throughout, the color center resulting from the synthesis of the R, G, and B components of the image pixel in the (2i-1) row and (2j-1) column represented by the left subpixels of the panel pixels a1 and b1 in the i row and j column is position P11, which is shifted to the left of the diagonal center ac11 of the panel pixel a1 and the diagonal center ac12 of the panel pixel b1 projected at the first point P1. The diagonal center ac11 and the diagonal center ac12 of the panel pixel b1 are indicated by white circles in the drawing, and position P11 is indicated by a black circle in the drawing.

[0060] Similarly, the color center of the image pixel represented by the left subpixels of panel pixels a2 and b2 in row i, column (j+1), specifically the image pixel in row (2i-1) and column (2j+1), is position P13 that is shifted to the left of the diagonal center ac13 of panel pixel a2 and the diagonal center ac14 of panel pixel b1 projected at the first point P1. The diagonal center ac13 and the diagonal center ac14 of panel pixel b1 are indicated by white circles in the figure, and position P13 is indicated by a black circle in the figure. Similarly, the color center of the image pixel represented by the right subpixel of panel pixels a1 and b1 in row i and column j is position P12, which is shifted to the right of the diagonal center ac11 of panel pixel a1 and the diagonal center ac12 of panel pixel b1, which are projected to the first point P1. The diagonal center ac12 is indicated by a white circle in the figure, and position P12 is indicated by a black circle in the figure.

[0061] Similarly, the color center of the image pixel represented by the panel pixel a2 in row i, column (j+1) and the right subpixel of panel pixel b2, specifically the image pixel in row (2i-1) and column (2j+2), is position P14, which is shifted to the right of the diagonal center ac13 of panel pixel a2 and the diagonal center ac14 of panel pixel b2, which are projected to the first point P1. The diagonal center ac14 is indicated by a white circle in the figure, and position P14 is indicated by a black circle in the figure.

[0062] 10, in a unit period (EfL-GR), of the panel pixel a1 in row i and column j, the sub-pixel C expresses the green component (G) of the video pixel in row (2i) and column (2j-1), and the sub-pixel R expresses the red component (R) of the video pixel in row (2i) and column (2j). In a unit period (EfL-B), of the panel pixel a1, the sub-pixel C expresses the blue component (B) of the video pixel in row (2i) and column (2j-1), and the sub-pixel R expresses black (Blk).

[0063] 10, in a unit period (EfL-GR), of the panel pixel b1 in row i and column j, the sub-pixel R expresses the red component (R) of the video pixel in row (2i) and column (2j-1), and the sub-pixel C expresses the green component (G) of the video pixel in row (2i) and column (2j). In a unit period (EfL-B), of the panel pixel b1, the sub-pixel R expresses black (Blk), and the sub-pixel C expresses the blue component (B) of the video pixel in row (2i) and column (2j).

[0064] For this reason, when looking at the unit period (EfL-GR) and the unit period (EfL-B) throughout, the color center of the image pixel represented by the panel pixel a1 in row i and column j and the left subpixel of panel pixel b1, specifically the image pixel in row (2i) and column (2i-1), is position P21 that is shifted to the left of the diagonal center ac21 of panel pixel a1 and the diagonal center ac22 of panel pixel b1 that are projected to the second point P2. The diagonal centers ac21 and ac22 are indicated by white circles in the figure, and position P21 is indicated by a black circle in the figure.

[0065] Similarly, the color center of the image pixel represented by the panel pixel a2 in row i, column (j+1) and the left subpixel of panel pixel b2, specifically the image pixel in row (2i) and column (2i+1), is position P23 that is shifted to the left of the diagonal center ac23 of panel pixel a2 and the diagonal center ac24 of panel pixel b2 projected to the second point P2. The diagonal centers ac23 and ac24 are indicated by white circles in the figure, and position P23 is indicated by a black circle in the figure.

[0066] Similarly, when looking at the unit period (OfL-GR) and the unit period (OfL-B) throughout, the color center of the image pixel represented by the panel pixel a1 in row i and column j and the right subpixel of panel pixel b1, specifically the image pixel in row (2i) and column (2j), is position P22, which is shifted to the right of the diagonal center ac21 of panel pixel a1 and the diagonal center ac22 of panel pixel b1, which are projected to the second point P2. Position P22 is indicated by a black circle in the drawing.

[0067] Similarly, the color center of the image pixel represented by panel pixel a2 in row i and column (j+1) and panel pixel b2, specifically the image pixel in row (2i) and column (2+2), is position P24, which is shifted to the right of the diagonal center ac23 of panel pixel a2 and the diagonal center ac24 of panel pixel b2, which are projected to the second point P2. Position P24 is indicated by a black circle in the drawing.

[0068] Therefore, according to the first embodiment, over one field period (1F), i.e., unit period (OfL-GR, OfL-B, EfL-GR, EfL-B), the image pixels in two rows and four columns are viewed by the user, in order, at positions P11 to P14 and P21 to P24, as shown in the lower column of Figure 10. Therefore, according to the first embodiment, the user can view a color image with a resolution four times higher than the resolution of the liquid crystal panels 100a and 100b. In other words, in this embodiment, it is sufficient to use liquid crystal panels 100a, 100b having a resolution that is 1 / 4 of the resolution of the viewed image, so that the construction can be made more inexpensively compared to the case where liquid crystal panels having the same resolution as the projected image are used.

[0069] In the first embodiment, cyan is an example of a first color light, red is an example of a second color light, green is an example of a third color light, blue is an example of a fourth color light, and yellow is an example of a fifth color light. The odd field period (Od-f) is an example of a first field period, and the even field period (Ev-f) is an example of a second field period. The order of the odd field period (Od-f) and the even field period (Ev-f) may be reversed. The unit period (OfL-GR) is an example of a first unit period, the unit period (OfL-B) is an example of a second unit period, the unit period (EfL-GR) is an example of a third unit period, and the unit period (EfL-B) is an example of a fourth unit period. The order of the unit period (OfL-GR) and the unit period (OfL-B) may be interchanged, and the order of the unit period (EfL-GR) and the unit period (EfL-B) may be interchanged.

[0070] Next, a projection type display device according to a second embodiment will be described. The projection type display device according to the second embodiment is different from the first embodiment in that the color filters of the sub-pixels in the liquid crystal panels 100a and 100b are changed, and the other configuration is the same as the first embodiment. Therefore, in the second embodiment, this change will be mainly described.

[0071] FIG. 11 is a diagram illustrating panel pixels corresponding to the arrangement of video pixels in FIG. 3, extracted from the panel pixels of the liquid crystal panel 100a and the panel pixels of the liquid crystal panel 100b in the second embodiment.

[0072] In the second embodiment, panel pixel a is composed of two sub-pixels that are divided almost equally in the vertical direction, as shown in the upper left column of the figure. More specifically, panel pixel a is composed of a left sub-pixel M and a right sub-pixel G, as shown in the upper right column of the figure. Panel pixel b is similarly composed of two sub-pixels that are divided almost equally in the vertical direction. More specifically, panel pixel b is composed of a left sub-pixel G and a right sub-pixel M in the figure.

[0073] The subpixel M is magenta, and when white light is incident, it is converted into red (R) component light. The subpixel G transmits blue light, and transmits green (G) light when white light is incident on the subpixel G. Specifically, magenta is complementary to green, and mixing magenta and green results in an achromatic color. Even more specifically, when displaying colors using the three colors red, green, and blue, mixing green with the other two colors red and blue results in magenta.

[0074] The arrangement of panel pixels a and b with respect to prism 180 has the relationship shown in the lower column of Fig. 11. In detail, when viewed from the exit surface of prism 180, subpixel M of panel pixel a overlaps subpixel G of panel pixel b, and subpixel G of panel pixel a overlaps subpixel M of panel pixel b.

[0075] 12 is a diagram for explaining the operation of the projection display device 1 according to the second embodiment. In the second embodiment, the odd-numbered field period (Od-f) is divided into a unit period (OfL-RG) and a unit period (OfL-B), and the even-numbered field period (Ev-f) is divided into a unit period (EfL-RG) and a unit period (EfL-B).

[0076] A unit period (OfL-RG) is a period during which the left sub-pixel M of panel pixel a expresses the red component (R-OO) of the image pixels in the odd rows and odd columns, and the right sub-pixel G of panel pixel a expresses the green component (G-OO) of the image pixels in the same row and one adjacent even column. In addition, the same unit period is a period during which the left sub-pixel G of panel pixel b expresses the green component (G-OE) of the image pixels in the odd rows and odd columns, and a period during which the right sub-pixel M of panel pixel b expresses the red component (R-OE) of the image pixels in the same row and adjacent even columns.

[0077] A unit period (OfL-B) is a period during which the left sub-pixel M of panel pixel a represents the blue component (B-OO) of the image pixels in the odd rows and odd columns, and the right sub-pixel G of panel pixel a represents black (Blk). In addition, the same unit period is a period during which the left sub-pixel G of panel pixel b expresses black (Blk), and a period during which the right sub-pixel M expresses the blue component (B-OE) among the image pixels in odd rows and even columns.

[0078] A unit period (EfL-RG) is a period during which the left sub-pixel M of panel pixel a expresses the red component (R-EO) of the image pixels in the even rows and odd columns, and the right sub-pixel G of panel pixel a expresses the green component (G-EO) of the image pixels in the same row and one adjacent even column. In addition, the same unit period is a period during which the left sub-pixel G of panel pixel b expresses the green component (G-EE) of the image pixels in the even rows and odd columns, and a period during which the right sub-pixel M of panel pixel b expresses the red component (R-EE) of the image pixels in the same row and adjacent even columns.

[0079] A unit period (EfL-B) is a period during which the left sub-pixel M of panel pixel a represents the blue component (B-EO) of the image pixels in the even rows and odd columns, and the right sub-pixel G of panel pixel a represents black (Blk). In addition, the same unit period is the period during which the left sub-pixel G of panel pixel b represents black (Blk), and the right sub-pixel M represents the blue component (B-EE) among the image pixels in the even rows and even columns.

[0080] The processing circuit 21 sets the projection position by the light path shift element 190 to a first point P1 of the reference position in the odd field period (Od-f) and to a second point P2 in the even field period (Ev-f) as in the first embodiment. Moreover, the processing circuit 21 controls the light sources 151 and 152 in the same manner as in the first embodiment. In detail, the processing circuit 21 controls the laser light sources 151R, 151G, 152R, and 152G to be in the on state in the unit periods (OfL-RG) and (EfL-RG), and controls the laser light sources 151B and 152B to be in the on state in the unit periods (OfL-B) and (EfL-B).

[0081] In the odd field period (Od-f) of the second embodiment, the incidence of yellow light during the unit period (OfL-GR) transmits the red component (R-OO) represented by the left sub-pixel M of panel pixel a, and also transmits the green component (G-OO) represented by the right sub-pixel G of panel pixel a, both of which are visually recognized by the user. The incidence of yellow light during the same unit period transmits the green component (G-OE) represented by the left sub-pixel G of panel pixel b, and also transmits the red component (R-OE) represented by the right sub-pixel M of panel pixel b, both of which are visually recognized by the user. When blue light is incident during the unit period (OfL-B), the blue component (B-OO) represented by the left subpixel M of panel pixel a is transmitted and is visible to the user, but the right subpixel G of panel pixel a displays black (Blk) and is therefore not visible to the user. Also, during the same unit period, the left subpixel G of panel pixel b displays black (Blk) and is therefore not visible to the user, but when blue light is incident, the blue component (B-OE) represented by the right subpixel M of panel pixel b is transmitted and is visible to the user.

[0082] In the even field period (Ev-f), the incidence of yellow light in the unit period (EfL-GR) causes the red component (R-EO) represented by the left subpixel M of panel pixel a to be transmitted, and the green component (G-EO) represented by the right subpixel G of panel pixel a to be transmitted, each of which is visually recognized by the user. In addition, the incidence of yellow light in the same unit period causes the green component (G-EE) represented by the left subpixel G of panel pixel b to be transmitted, and the red component (R-EE) represented by the right subpixel M of panel pixel b to be transmitted, each of which is visually recognized by the user. When blue light is incident during the unit period (EfL-B), the blue component (B-EO) represented by the left subpixel M of panel pixel a is transmitted and is visible to the user, but since black (Blk) is represented by the right subpixel G of panel pixel a, it is not visible to the user. Also, during the same unit period, black (Blk) is represented by the left subpixel G of panel pixel b, so it is not visible to the user, but when blue light is incident, the blue component (B-EE) represented by the right subpixel M of panel pixel b is transmitted and is visible to the user.

[0083] Therefore, in the second embodiment, as in the first embodiment, it is sufficient to use liquid crystal panels 100a, 100b having a resolution that is 1 / 4 of the resolution of the viewed image, so that the second embodiment can be constructed more inexpensively than when liquid crystal panels having the same resolution as the projected image are used.

[0084] In the second embodiment, magenta is an example of a first color light, green is an example of a second color light, red is an example of a third color light, blue is an example of a fourth color light, and yellow is an example of a fifth color light. The unit period (OfL-RG) is an example of a first unit period, the unit period (OfL-B) is an example of a second unit period, the unit period (EfL-RG) is an example of a third unit period, and the unit period (EfL-B) is an example of a fourth unit period. The order of the unit period (OfL-RG) and the unit period (OfL-B) may be interchanged, and the order of the unit period (EfL-RG) and the unit period (EfL-B) may be interchanged.

[0085] Next, a projection display device according to a third embodiment will be described. The projection display device according to the third embodiment is different from the first embodiment in that the color filters of the sub-pixels in the liquid crystal panels 100a and 100b are changed, and the other configuration is the same as the first embodiment. Therefore, in the third embodiment, this change will be mainly described.

[0086] FIG. 13 is a diagram illustrating panel pixels corresponding to the arrangement of video pixels in FIG. 3, extracted from the panel pixels of the liquid crystal panel 100a and the panel pixels of the liquid crystal panel 100b in the third embodiment.

[0087] In the second embodiment, panel pixel a is composed of two sub-pixels that are divided almost equally in the vertical direction, as shown in the upper left column of the figure. More specifically, panel pixel a is composed of a left sub-pixel Y and a right sub-pixel B, as shown in the upper right column of the figure. Panel pixel b is similarly composed of two sub-pixels that are divided almost equally in the vertical direction. More specifically, panel pixel b is composed of a left sub-pixel B and a right sub-pixel Y in the figure.

[0088] The subpixel Y is yellow and transmits green (G) and blue light components when white light is incident on it, while the subpixel B is blue and transmits blue (B) light components when white light is incident on it. In particular, yellow is complementary to blue, and mixing yellow and blue results in an achromatic color. Even more particularly, when displaying colors using the three colors red, green, and blue, mixing blue with the other two colors red and green results in yellow.

[0089] The arrangement of panel pixels a and b with respect to prism 180 has the relationship shown in the lower column of Fig. 13. In detail, when viewed from the exit surface of prism 180, sub-pixel Y of panel pixel a overlaps sub-pixel B of panel pixel b, and sub-pixel B of panel pixel a overlaps sub-pixel Y of panel pixel b.

[0090] 13 is a diagram for explaining the operation of the projection display device 1 according to the third embodiment. In the second embodiment, the odd field period (Od-f) is divided into a unit period (OfL-GB) and a unit period (OfL-R), and the even field period (Ev-f) is divided into a unit period (EfL-GB) and a unit period (EfL-R).

[0091] The unit period (OfL-GB) is the period during which the left sub-pixel Y of the panel pixel a expresses the green component (G-OO) among the image pixels in the odd rows and odd columns, and the period during which the right sub-pixel B of the panel pixel a expresses the blue component (B-OO) among the image pixels in the same row and one adjacent even column. In addition, the same unit period is a period during which the left sub-pixel B of panel pixel b expresses the blue component (B-OE) of the image pixels in the odd rows and odd columns, and a period during which the right sub-pixel Y of panel pixel b expresses the green component (G-OE) of the image pixels in the same row and one adjacent even column.

[0092] A unit period (OfL-R) is a period during which the left sub-pixel Y of panel pixel a represents the red component (R-OO) of the image pixels in the odd rows and odd columns, and the right sub-pixel B of panel pixel a represents black (Blk). In addition, the same unit period is a period during which the left sub-pixel B of panel pixel b expresses black (Blk), and a period during which the right sub-pixel Y expresses the red component (R-OE) of the image pixels in the odd rows and even columns.

[0093] The unit period (EfL-GB) is the period during which the left sub-pixel Y of the panel pixel a expresses the green component (G-EO) of the image pixels in the even rows and odd columns, and the period during which the right sub-pixel B of the panel pixel a expresses the blue component (B-EO) of the image pixels in the same row and the adjacent even column. In addition, the same unit period is a period during which the left sub-pixel B of panel pixel b expresses the blue component (B-EE) of the image pixels in the even rows and odd columns, and a period during which the right sub-pixel Y of panel pixel b expresses the green component (G-EE) of the image pixels in the same row and one adjacent even column.

[0094] A unit period (EfL-R) is a period during which the left sub-pixel Y of panel pixel a represents the red component (R-EO) of the image pixels in the even rows and odd columns, and the right sub-pixel B of panel pixel a represents black (Blk). In addition, the same unit period is the period during which the left sub-pixel B of panel pixel b expresses black (Blk), and the right sub-pixel Y expresses the red component (R-EE) among the image pixels in the even rows and even columns.

[0095] The processing circuit 21 sets the projection position by the light path shift element 190 to a first point P1 of the reference position in the odd field period (Od-f) and to a second point P2 in the even field period (Ev-f) as in the first and second embodiments. The processing circuit 21 controls the light sources 151 and 152 as follows. In detail, the processing circuit 21 controls the laser light sources 151G, 151B, 152G, and 152B to be in the ON state in the unit periods (OfL-GB) and (EfL-GB), causing cyan light to be incident on the liquid crystal panels 100a and 100b, respectively. The processing circuit 21 controls the laser light sources 151R and 152R to be in the ON state in the unit periods (OfL-R) and (EfL-R), causing red light to be incident on the liquid crystal panels 100a and 100b, respectively.

[0096] In the odd field period (Od-f) of the second embodiment, the incidence of cyan light during the unit period (OfL-GB) transmits the green component (G-OO) represented by the left subpixel Y of panel pixel a, and transmits the blue component (B-OO) represented by the right subpixel B of panel pixel a, both of which are visually recognized by the user. The incidence of cyan light during the same unit period transmits the blue component (B-OE) represented by the left subpixel B of panel pixel b, and transmits the green component (G-OE) represented by the right subpixel Y of panel pixel b, both of which are visually recognized by the user.

[0097] When red light is incident during a unit period (OfL-R), the red component (R-OO) represented by the left subpixel Y of panel pixel a is transmitted and is visible to the user, but since black (Blk) is represented by the right subpixel B of panel pixel a, it is not visible to the user. Also, during the same unit period, black (Blk) is represented by the left subpixel G of panel pixel b, so it is not visible to the user, but when red light is incident, the red component (R-OE) represented by the right subpixel Y of panel pixel b is transmitted and is visible to the user.

[0098] In the even field period (Ev-f), the incidence of cyan light in the unit period (EfL-GB) causes the green component (G-EO) represented by the left subpixel Y of panel pixel a to be transmitted, and the blue component (B-EO) represented by the right subpixel B of panel pixel a to be transmitted, each of which is visually recognized by the user. In addition, the incidence of cyan light in the same unit period causes the blue component (B-EE) represented by the left subpixel B of panel pixel b to be transmitted, and the green component (G-EE) represented by the right subpixel Y of panel pixel b to be transmitted, each of which is visually recognized by the user. When red light is incident during a unit period (EfL-R), the red component (R-EO) represented by the left subpixel Y of panel pixel a is transmitted and is visible to the user, but since black (Blk) is displayed in the right subpixel B of panel pixel a, it is not visible to the user. Also, during the same unit period, black (Blk) is displayed in the left subpixel B of panel pixel b, so it is not visible to the user, but when red light is incident, the red component (R-EE) represented by the right subpixel Y of panel pixel b is transmitted and is visible to the user.

[0099] Therefore, in the third embodiment, as in the first embodiment, it is sufficient to use liquid crystal panels 100a, 100b having a resolution that is 1 / 4 of the resolution of the viewed image, so that the third embodiment can be constructed more inexpensively than when liquid crystal panels having the same resolution as the projected image are used.

[0100] In the third embodiment, yellow is an example of a first color light, blue is an example of a second color light, green is an example of a third color light, red is an example of a fourth color light, and cyan is an example of a fifth color light. The unit period (OfL-GB) is an example of a first unit period, the unit period (OfL-R) is an example of a second unit period, the unit period (EfL-GB) is an example of a third unit period, and the unit period (EfL-R) is an example of a fourth unit period. The order of the unit period (OfL-GB) and the unit period (OfL-R) may be interchanged, and the order of the unit period (EfL-GB) and the unit period (EfL-R) may be interchanged.

[0101] In the above-described first and second embodiments (hereinafter referred to as "embodiments, etc."), various modifications or applications are possible as follows.

[0102] In the embodiment and the like, the liquid crystal panels 100a and 100b serving as the image light emitting device are of a transmissive type, but may be of a reflective type.

[0103] In the embodiment and the like, the panel pixels a and b are each composed of two sub-pixels that are divided almost equally in the vertical direction, but this is not limited to the configuration. For example, the panel pixels a and b may each be composed of two sub-pixels that are divided almost equally in the horizontal direction. When the panel pixels a and b are each composed of two sub-pixels that are divided almost equally in the horizontal direction, the processing circuit 21 controls the light path shift element 190 to set the projection position to a reference position in the odd field period (Od-f) and shift the projection position from the reference position by 0.5 panel pixels in the horizontal direction in the even field period (Ev-f).

[0104] In the embodiment, since the liquid crystal panels 100a and 100b are used, a positive polarity writing period and a negative polarity writing period are executed in each unit period. That is, a data signal corresponding to the same gray level is written twice to the sub-pixel in each unit period. Since the optical response (temporal change in transmittance) of the liquid crystal tends to be slower than other display elements, the transmittance corresponding to the data signal may not be reached in the first writing period. Therefore, the laser light source may be turned on in the second writing period when the transmittance is considered to be stable.

[0105] In addition, the image light output device may also be, for example, a mirror element in which the inclination of a mirror takes a position corresponding to on or off, and reflects incident light in a predetermined direction only when the mirror is in either the on or off state. When a mirror element is applied, a color filter is provided corresponding to a subpixel, the color of light incident on the mirror element is controlled for each unit period, and the light path of the light path shift element is controlled for each field period.

[0106] The light sources 151 and 152 use laser light sources that emit light of each of the three primary colors. For example, a light source that emits yellow light alone may be used, or a laser light source that converts the wavelength of a laser beam of a single wavelength and emits the converted laser beam may be used.

[0107] From the above-mentioned exemplary embodiments, for example, the following aspects can be understood.

[0108] A projection type display device according to one aspect 1 includes a first image light-emitting device having a first subpixel that emits a first color light and a second subpixel that is arranged next to the first subpixel in a first direction and emits a second color light, the first image light-emitting device emitting a first image light including the first color light emitted from the first subpixel and the second color light emitted from the second subpixel, a third subpixel that emits the second color light and a fourth subpixel that is arranged next to the third subpixel in the first direction and emits the first color light, the second image light-emitting device emitting a second image light including the second color light emitted from the third subpixel and the first color light emitted from the fourth subpixel, and a second image light-emitting device overlaying the first color light emitted from the first subpixel and the second color light emitted from the third subpixel, the second image light-emitting device overlaying the first color light emitted from the first subpixel and the second color light emitted from the third subpixel, the second image light-emitting device overlaying the first color light emitted from the first subpixel and the second color light emitted from the third subpixel, the second image light-emitting device overlaying the first color light emitted from the first subpixel and the second color light emitted from the third subpixel, the second image light-emitting device overlaying the first color light emitted from the second ... a combining optical system that superimposes the second color light emitted from the fourth sub-pixel with the first color light emitted from the fourth sub-pixel and outputs combined light obtained by combining the first image light and the second image light, a light path shift element that shifts an optical path of the combined light emitted from the combining optical system, and a display control circuit that controls the first image light output device, the second image light output device, and the light path shift element, wherein the display control circuit supplies data signals corresponding to a grayscale level designated by video pixel data to the first image light output device and the second image light output device, for a first field period and a second field period, and controls the light path shift element to shift an optical path in the second field period relative to an optical path in the first field period in a second direction intersecting the first direction. The projection display device according to aspect 1 can provide high-resolution projection at low cost.

[0109] In a projection display device according to a specific aspect 2 of aspect 1, the second color light is complementary to the first color light. Note that two colors being complementary to each other means that when the two colors are mixed, the mixture becomes an achromatic color.

[0110] In a projection display device according to a specific aspect 3 of aspect 2, when displaying colors using the second, third and fourth colors, the first color is a mixture of the third and fourth colors.

[0111] In a projection type display device related to a specific aspect 4 of aspect 3, the first image light output device has a first liquid crystal panel, a first light source that outputs light toward the first liquid crystal panel, and a first polarization conversion member that converts the light emitted by the first light source into first polarized light, and the first polarized light is incident on the first liquid crystal panel, and the second image light output device has a second liquid crystal panel, a second light source that outputs light toward the second liquid crystal panel, and a second polarization conversion member that converts the light emitted by the second light source into second polarized light, and the second polarized light is incident on the second liquid crystal panel.

[0112] In a projection display device according to a specific aspect 5 of aspect 4, the first light source and the second light source are laser light sources capable of emitting a fourth color of light including the wavelength range of the fourth component, and a fifth color of light which is a mixture of the second color and the third color.

[0113] In a projection display device according to a specific aspect 6 of aspect 5, the first field period includes a first unit period and a second unit period, the second field period includes a third unit period and a fourth unit period, and in the first unit period and the third unit period, the first light source and the second light source emit light of the fifth color, and in the second unit period and the fourth unit period, the first light source and the second light source emit light of the fourth color.

[0114] In a projection display device according to a seventh specific aspect of the sixth aspect, the display control circuit, during the first unit period, supplies a data signal corresponding to a gradation level of the third color light component of the video pixel data in odd rows and odd columns to the first sub-pixel, supplies a data signal corresponding to a gradation level of the second color light component of the video pixel data in odd rows and odd columns to the second sub-pixel, and supplies a data signal corresponding to the gradation level of the second color light component of the video pixel data in odd rows and even columns to the second sub-pixel. a data signal corresponding to the grayscale level of the fourth color light component of video pixel data in odd-numbered rows and odd-numbered columns among the video pixel data is supplied to the first subpixel, a data signal corresponding to the lowest grayscale level is supplied to the second subpixel and the third subpixel, and a data signal corresponding to the grayscale level of the fourth color light component of video pixel data in odd-numbered rows and odd-numbered columns among the video pixel data is supplied to the third subpixel, and a data signal corresponding to the lowest grayscale level is supplied to the fourth subpixel, a data signal corresponding to the gradation level of the third color light component of video pixel data in even rows and odd columns among the video pixel data is supplied to the first subpixel, a data signal corresponding to the gradation level of the second color light component of video pixel data in even rows and odd columns among the video pixel data is supplied to the second subpixel, a data signal corresponding to the gradation level of the second color light component of video pixel data in even rows and even columns among the video pixel data is supplied to the third subpixel, to the fourth sub-pixel, and in the fourth unit period, a data signal corresponding to the gradation level of the fourth color light component of video pixel data in even rows and even columns of the video pixel data is supplied to the first sub-pixel, a data signal corresponding to the lowest gradation level is supplied to the second sub-pixel and the third sub-pixel, and a data signal corresponding to the gradation level of the fourth color light component of video pixel data in even rows and even columns is supplied to the fourth sub-pixel.

[0115] In a projection type display device according to a specific alternative aspect 8 of any of aspects 1 to 7, in the synthetic optical system, the amount of shift of the second image in a first direction relative to the first image is 0.5 pixels in the first image or the second image, and the amount of shift of the optical path by the optical path shift element is 0.5 pixels. [Explanation of symbols]

[0116] 1...projection type display device, 100a, 100b...liquid crystal panel, 1100...pixel circuit, 110a, 110b...sub-pixel circuit, 118...pixel electrode, 120...liquid crystal element, 20...display control circuit, 21...processing circuit, 22a, 22b...conversion circuit, 180...prism, 190...light path shift element.

Claims

1. a first image light-emitting device including a first sub-pixel that emits a first color light and a second sub-pixel that is arranged next to the first sub-pixel in a first direction and emits a second color light, the first image light-emitting device emitting a first image light including the first color light emitted from the first sub-pixel and the second color light emitted from the second sub-pixel; a second image light-emitting device including a third sub-pixel that emits the second color light and a fourth sub-pixel that is arranged next to the third sub-pixel in the first direction and emits the first color light, the second image light-emitting device emitting a second image light including the second color light emitted from the third sub-pixel and the first color light emitted from the fourth sub-pixel; a combining optical system that superimposes the first color light emitted from the first sub-pixel and the second color light emitted from the third sub-pixel, superimposes the second color light emitted from the second sub-pixel and the first color light emitted from the fourth sub-pixel, and emits a combined light obtained by combining the first image light and the second image light; a light path shift element that shifts an optical path of the combined light emitted from the combining optical system; a display control circuit that controls the first image light-emitting device, the second image light-emitting device, and the light path shift element; Including, The display control circuit includes: supplying a data signal corresponding to a gray level designated by video pixel data to the first image light-emitting device and the second image light-emitting device, the data signal being divided into a first field period and a second field period; The light path shift element is controlled to shift the light path in the second field period relative to the light path in the first field period in a second direction intersecting the first direction.

1. A projection display device comprising:

2. The second color light has a complementary color to the first color light.

2. The projection display device according to claim 1.

3. When displaying colors using the second color, the third color, and the fourth color, The first color is a mixture of the third color and the fourth color.

3. The projection display device according to claim 2.

4. The first image light emitting device is A first liquid crystal panel; a first light source that emits light toward the first liquid crystal panel; a first polarization conversion member that converts the light emitted by the first light source into a first polarized light; having the first polarized light is incident on the first liquid crystal panel, The second image light emitting device is A second liquid crystal panel; a second light source that emits light toward the second liquid crystal panel; a second polarization conversion member that converts the light emitted by the second light source into a second polarized light; having The second polarized light is incident on the second liquid crystal panel.

4. The projection display device according to claim 3.

5. The first light source and the second light source are a fourth color of light that includes the wavelength range of the fourth component; and a fifth color of light that is a mixture of the second color and the third color; It is a laser light source that can emit 5. The projection display device according to claim 4.

6. the first field period includes a first unit period and a second unit period, the second field period includes a third unit period and a fourth unit period, In the first unit period and the third unit period, the first light source and the second light source emit light of the fifth color, In the second unit period and the fourth unit period, The first light source and the second light source emit light of the fourth color.

6. The projection display device according to claim 5.

7. The display control circuit includes: In the first unit period, Among the image pixel data, supplying a data signal corresponding to a gray level of the third color light component of image pixel data in odd-numbered rows and odd-numbered columns to the first sub-pixel; supplying a data signal corresponding to a gray level of the second color light component of image pixel data in odd-numbered rows and odd-numbered columns to the second sub-pixel; Among the image pixel data, supplying a data signal corresponding to a gray level of the second color light component of image pixel data in odd-numbered rows and even-numbered columns to the third sub-pixel; supplying a data signal corresponding to a gray level of the third color light component of image pixel data in odd-numbered rows and even-numbered columns to the fourth sub-pixel; In the second unit period, Among the image pixel data, supplying a data signal corresponding to a grayscale level of the fourth color light component of image pixel data in even-numbered rows and odd-numbered columns to the first sub-pixel; supplying a data signal corresponding to a lowest gray level to the second subpixel and the third subpixel; supplying a data signal corresponding to a grayscale level of the fourth color light component of image pixel data in even-numbered rows and odd-numbered columns to the fourth sub-pixel; In the third unit period, Among the image pixel data, supplying a data signal corresponding to a grayscale level of the third color light component of image pixel data in even-numbered rows and odd-numbered columns to the first sub-pixel; supplying a data signal corresponding to a gray level of the second color light component of image pixel data in even-numbered rows and odd-numbered columns to the second sub-pixel; Among the image pixel data, supplying a data signal corresponding to a gray level of the second color light component of image pixel data in even-numbered rows and even-numbered columns to the third sub-pixel; supplying a data signal corresponding to a gray level of the third color light component of image pixel data in even-numbered rows and even-numbered columns to the fourth sub-pixel; In the fourth unit period, Among the image pixel data, supplying a data signal corresponding to a grayscale level of the fourth color light component of image pixel data in even-numbered rows and even-numbered columns to the first sub-pixel; supplying a data signal corresponding to a lowest gray level to the second subpixel and the third subpixel; A data signal corresponding to a gray level of the fourth color light component of image pixel data in an even-numbered row and an even-numbered column is supplied to the fourth sub-pixel.

7. The projection display device according to claim 6.

8. In the synthesis optical system, the amount of shift of the second image relative to the first image in the first direction is 0.5 pixels of the first image or the second image, The shift amount of the optical path by the optical path shift element is 0.5 pixel.

8. The projection display device according to claim 1.

Images