Projection type display device

Abstract

To realize, at a low price, color display with high resolution in a projection type display device.SOLUTION: A projection type display device includes: a liquid crystal panel 100a that creates a first image; a liquid crystal panel 100b that creates a second image; a prism 180 that composes the first image and the second image shifted in a transverse direction relative to the first image, and emits the resultant image; a position adjustment element 195 that shifts an optical path of the first image; an optical path shifting element 190 that shifts an optical path of the image emitted from the prism 180; and a display control circuit 20 that controls the liquid crystal panels 100a, 100b, and the optical path shifting element 190. The display control circuit 20, in an odd number field period, of video pixels, supplies a data signal Vid_a on an odd number row to the liquid crystal panel 100a, and supplies a data signal Vid_b on an even number row to the liquid crystal panel 100b, and in an even number field period, supplies a data signal Vid_a on the even number row to the liquid crystal panel 100a, and supplies the data signal Vid_b on the even number row to the liquid crystal panel 100b.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[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 technique 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 for projection to achieve higher resolution (see, for example, Patent Document 1). Specifically, when realizing color display in the above technique, the configuration is as follows. That is, in the first optical system, an image formed by three liquid crystal panels is combined by a first dichroic prism to form a first optical image, and in the second optical system, an image formed by three liquid crystal panels is combined by a second dichroic prism to form a second optical image. Further, the first optical image and the second optical image are combined by a prism.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above technique, not only six liquid crystal panels are required, but also three prisms for combining optical images are needed. Therefore, in the above technique, in order to realize high-resolution color display, there is a problem that not only does the configuration become complicated, but also the cost increases.

Means for Solving the Problems

[0005] In order to solve the above problems, a projection display device according to an aspect of the present disclosure includes a first image light emitting device that emits first image light, a second image light emitting device that emits second image light, and a combining optical system that combines the first image light and the second image light with the second image light shifted in a first direction with respect to the first image light and emits the combined light as combined light. A first optical path shift element is provided between the first image light emitting device and the combining optical system to shift the optical path of the first image light emitted from the first image light emitting device. A second optical path shift element is provided to shift the optical path of the combined light emitted from the combining optical system. A display control circuit controls the first image light emitting device, the second image light emitting device, the first optical path shift element, and the second optical path shift element. Video pixel data constituting video data is arranged along the first direction and a second direction intersecting the first direction. One frame period includes a first field period and a second field period. The display control circuit supplies, in the first field period, data signals of video pixels that are odd-numbered in the second direction of the arrangement and odd-numbered in the first direction to the first image light emitting device, and supplies data signals of video pixels that are odd-numbered in the second direction of the arrangement and even-numbered in the first direction to the second image light emitting device. In the second field period, the display control circuit supplies data signals of video pixels that are even-numbered in the second direction of the arrangement and odd-numbered in the first direction to the first image light emitting device, and supplies data signals of video pixels that are even-numbered in the second direction of the arrangement and even-numbered in the first direction to the second image light emitting device. The second optical path shift element is controlled to shift the optical path in the second direction from the position of the first field. 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

[0006]

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Embodiments for Carrying Out the Invention

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

[0008] FIG. 1 is a diagram showing an optical configuration of a projection display device 1 according to an 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, an optical path shift element 190, a position adjustment element 195, and a projection lens 200.

[0009] The light source 151 includes laser light sources 151R, 151G, and 151B. Among 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, shapes it into a substantially parallel light beam with a substantially uniform illuminance, and converts it into P-polarized light among the light beams and emits it toward the transmissive liquid crystal panel 100a. Note that the conversion into P-polarized light also includes transmitting 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. Note that 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 not modulated by the liquid crystal panel 100a is blocked by the polarizing plate 172a.

[0010] The light source 152 includes laser light sources 152R, 152G, and 152B in the same manner as the light source 151. Among these, the laser light source 152R emits light including a red wavelength range, the laser light source 152G emits light in a green wavelength range, and the laser light source 152B emits light in a blue wavelength range. The polarization optical system 160b diffuses the emitted light from the laser light sources 152R, 152G, and 152B, forms it into a substantially uniform illuminance and a substantially parallel light beam, converts the light of the S polarization component among the light beam, and emits it toward the transmissive liquid crystal panel 100b. Note that the conversion to the light of the S polarization component also includes the transmission of the light of the S polarization component. 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. Note that the transmission axis of the polarizing plate 171b is the S polarization, and the transmission axis of the polarizing plate 172b is the P polarization. Therefore, the S polarization 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 pixel circuits as described later. Each of the plurality of 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. By this modulation, the amount of light transmitted through the polarizing plate 172a changes, that is, the transmittance changes. Therefore, by individually controlling the modulation by the liquid crystal element based on the data signal, a transmitted image is generated on the liquid crystal panel 100a. Similarly, a transmitted image is generated on the liquid crystal panel 100b.

[0012] The position adjustment element 195 shifts the optical path of the transmitted image by the liquid crystal panel 100b and emits it toward the prism 180. Although details of the position adjustment element 195 will be described later, the optical path of the transmitted image by the liquid crystal panel 100b is shifted in the horizontal and vertical directions with respect to the arrangement of the panel pixels. That is, the position adjustment element 195 can shift the optical path of the transmitted image in two axes. Note that the shift of the optical path by the position adjustment element 195 is only once immediately after power-on.

[0013] In the prism 180, the transmitted image of the liquid crystal panel 100a is incident from the 9 o'clock direction in FIG. 1, and the transmitted image of the liquid crystal panel 100b is incident from the 12 o'clock direction. At the joint surface 182 of the prism 180, among the transmitted images of the liquid crystal panel 100a, the light of S polarization transmits and travels straight, and among the transmitted images of the liquid crystal panel 100b, the light of P polarization is reflected. Therefore, in the prism 180, the transmitted image of the liquid crystal panel 100a and the transmitted image of the liquid crystal panel 100b are combined, and the combined image is emitted in the 3 o'clock direction. The combined image by the prism 180 is incident on the projection lens 200 through the optical path shift element 190. The projection lens 200 enlarges and projects the combined image through the optical path shift element 190 onto the screen Scr. The optical path shift element 190 shifts the optical path of the light emitted from the prism 180, and in the embodiment, shifts the combined image projected onto the screen Scr in the vertical direction with respect to the projection plane.

[0014] Note that at the joint surface 182 of the prism 180, the transmitted image by the liquid crystal panel 100a travels straight, while the transmitted image by the liquid crystal panel 100b is reflected. Therefore, the transmitted image by the liquid crystal panel 100b is generated with a horizontal inversion with respect to the transmitted image of the liquid crystal panel 100a. In addition, the transmitted image by the liquid crystal panel 100a and the transmitted image by the liquid crystal panel 100b have mismatched pixels and are combined in a shifted state as will be described later.

[0015] FIG. 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 the above-described liquid crystal panels 100a and 100b, light sources 151 and 152, an optical path shift element 190, a position adjustment element 195, and a display control circuit 20.

[0016] Video data Vid_in is supplied from a host device or the like (not shown) in synchronization with a synchronization signal Sync. The video data Vid_in designates the gradation level of pixels in an image constituting one frame period of the video, for each of RGB, for example, with 8 bits.

[0017] Incidentally, the pixels of the image specified by the video data Vid_in are referred to as video pixels, and the data specifying the gradation level of the video pixels is referred to as video pixel data. However, the video pixels and the video pixel data may not be particularly distinguished. Also, the pixels of the image before or after synthesis by the liquid crystal panel 100a or 100b are referred to as panel pixels. The position of the panel pixels shifted by the optical 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 corresponding to the pixel circuits are arranged in a matrix when viewed in 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 compared with the arrangement of the panel pixels by the liquid crystal panel 100a or 100b.

[0018] The synchronization signal Sync includes a vertical synchronization signal instructing the start of the vertical scanning of the video data Vid_in, a horizontal synchronization signal instructing the start of the horizontal scanning, and a clock signal indicating the timing of one video pixel in the video data Vid_in.

[0019] The display control circuit 20 includes a processing circuit 21, and conversion circuits 22a and 22b. The processing circuit 21 controls the position adjustment element 195 in the initialization process immediately after power-on. In the video projection process after the initialization process, the processing circuit 21 controls the conversion circuits 22a and 22b, the liquid crystal panels 100a and 100b for each writing period described later based on the synchronization signal Sync, and controls the light sources 151 and 152 and the optical path shift element 190 for each field period described later.

[0020] The position adjustment element 195 shifts the transmitted image of the liquid crystal panel 100b according to the position data in the initialization process and makes it incident on the prism 180. The position data is stored in the memory element M of the processing circuit 21 before shipment from the factory. Also, when the optical path is shifted by the position adjustment element 195 in the initialization process, the optical path is fixed thereafter. However, when the power is turned off, it is restored to the state before the shift. In the video projection process, the optical path shift element 190 shifts the projection position for each field period according to the control by the processing circuit 21.

[0021] FIG. 3 is a diagram showing a part of the array of video pixels represented by the video data Vid_in. In the figure, in order to distinguish the video pixels in the image represented by the video data Vid_in, for convenience, A1 to A4 are assigned to the first row as symbols, B1 to B4 are assigned to the second row, C1 to C4 are assigned to the third row, and D1 to D4 are assigned to the fourth row, respectively.

[0022] Returning to FIG. 2 for explanation again. Among the video data Vid_in, the video pixel data that specifies the gradation level of the video pixels represented by the liquid crystal panel 100a is denoted as Va, and the video pixel data that specifies the gradation level of the video pixels represented by the liquid crystal panel 100b is denoted as Vb.

[0023] 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 writing period, converts it into a data signal Vid_a of an analog voltage of the polarity corresponding to the writing period, and supplies it to the liquid crystal panel 100a. The conversion circuit 22b is different only in the video pixel data to be converted from the conversion circuit 22a, and the others are common to the conversion circuit 22a. That is, the conversion circuit 22b temporarily stores the video pixel data Vb, then reads out the video pixel data of the color component corresponding to the writing period, converts it into a data signal Vid_b of an analog voltage of the polarity corresponding to the writing period, and supplies it to the liquid crystal panel 100b. Note that which video pixel gradation level the video pixel data Va and Vb specify will be described later.

[0024] FIG. 4 is a diagram showing a part of the panel pixels of the liquid crystal panel 100a and the panel pixels of the liquid crystal panel 100b, which correspond to the array of video pixels in FIG. 3. For convenience of explanation, the panel pixels of the liquid crystal panel 100a are denoted as panel pixels a, and the panel pixels of the liquid crystal panel 100b are denoted as panel pixels b. In the arrangement in the left column, for the purpose of distinguishing panel pixel a, for convenience, a1 and a2 are given as signs in the first row, and a3 and a4 are given in the second row. In the arrangement in the right column, for the purpose of distinguishing panel pixel b, for convenience, b1 and b2 are given as signs in the first row, and b3 and b4 are given in the second row.

[0025] As will be described later, micro-lenses are provided for each panel pixel in the liquid crystal panels 100a and 100b in order to improve the light utilization efficiency. For this reason, the brightness at the panel pixel is not uniform when viewed in plan view. Actually, it becomes brighter near the center of the panel pixel and darker as it goes from near the center to the outside. In the figure, the circles of panel pixels a and b simply indicate the parts that become brighter than other parts due to the light collection of the micro-lenses. The center of the circle approximately coincides with the diagonal center of panel pixel a or b.

[0026] The arrangements of panel pixels a and b with respect to the prism 180 are in the relationship shown in the lower column of FIG. 4 after the shift of the optical path by the position adjustment element 195. Specifically, the arrangement of panel pixel b is shifted 0.5 pixel to the right in the figure with respect to the arrangement of panel pixel a. Specifically, the center of panel pixel b1 is located between the centers of panel pixel a1 and panel pixel a2, and the center of panel pixel b3 is located between the centers of panel pixel a3 and panel pixel a4.

[0027] Next, the liquid crystal panels 100a and 100b will be described. The liquid crystal panels 100a and 100b differ only in the supplied data signals and are common in structure. Therefore, the liquid crystal panels 100a and 100b will be generally described using the reference numeral 100 without specifying either of them.

[0028] FIG. 5 is a perspective view showing the liquid crystal panel 100, and FIG. 6 is a cross-sectional view taken along the line H-h in FIG. 5. As shown in these figures, in the liquid crystal panel 100, an element substrate 101 provided with pixel electrodes 118 and a counter substrate 102 provided with common electrodes 108 are bonded together by a sealing material 90 such that their electrode formation surfaces face each other while maintaining a certain gap therebetween, and liquid crystal 105 is encapsulated in this gap.

[0029] As the element substrate 101 and the counter substrate 102, substrates having light transmissivity such as glass and quartz are used respectively. 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 along the horizontal direction in this protruding region in the figure. One end of an FPC (Flexible Printed Circuits) substrate (not shown) is connected to the plurality of terminals 106. Note that the other end of the FPC substrate is connected to a display control circuit 20, and various signals described above are supplied.

[0030] On the surface of the element substrate 101 facing the counter substrate 102, the pixel electrodes 118 are provided, for example, by patterning a conductive layer having transparency such as ITO (Indium Tin Oxide). Although not shown, on the counter substrate 102 (or the element substrate 101), microlenses are provided for each panel pixel in order to efficiently send a lot of light into the openings that become panel pixels. With this configuration, the light that was bounced off by the light-shielding portion is sent into the openings of the microlenses, so the utilization efficiency of light is enhanced. The reason for providing the light-shielding portion is to define the outer edge of the panel pixel and to prevent light leakage in the transistor.

[0031] FIG. 7 is a block diagram showing the electrical configuration of the liquid crystal panel 100. A scanning line drive circuit 130 and a data line drive circuit 140 are provided at the periphery of the display region 10 of the liquid crystal panel 100.

[0032] In the display area 10, pixel circuits 110 are arranged in a matrix. Specifically, in the display area 10, a plurality of scanning lines 12 extend horizontally as shown in the figure, and a plurality of data lines 14 extend vertically and are provided while maintaining electrical insulation from the scanning lines 12. Then, pixel circuits 110 are provided in a matrix corresponding to the intersections of the plurality of scanning lines 12 and the plurality of data lines 14.

[0033] When the number of scanning lines 12 is m and the number of data lines 14 is n, the pixel circuits 110 are arranged in a matrix of m rows in the vertical direction × n columns in the horizontal direction. Both m and n are integers of 2 or more. In the scanning lines 12 and the pixel circuits 110, in order to distinguish the rows of the matrix, they may be called the 1st, 2nd, 3rd,..., (m - 1)th, and mth rows in order from the top in the figure. Similarly, in the data lines 14 and the pixel circuits 110, in order to distinguish the columns of the matrix, they may be called the 1st, 2nd, 3rd,..., (n - 1)th, and nth columns in order from the left in the figure. Note that since the video pixels are arranged 2 times in the vertical direction and 2 times in the horizontal direction with respect to the arrangement of the panel pixels, the arrangement of the video pixels is (2m) rows in the vertical direction × (2n) columns in the horizontal direction.

[0034] "Row" and "column" are relative concepts. When one of the horizontal (left - right) direction or the vertical (up - down) direction is defined as "row", the other of the horizontal or vertical direction becomes "column". However, in this description, for the sake of convenience, the horizontal direction in which the scanning lines 12 extend as described above is defined as "row", and the vertical direction in which the data lines 14 extend is defined as "column". Odd - numbered and even - numbered are also relative concepts. When one of the horizontal or vertical directions is odd - numbered, the other of the horizontal or vertical directions excluding the odd - numbered ones becomes even - numbered.

[0035] Also, in order to generally describe the rows of the scanning lines 12, panel pixels, or video pixels, an integer i from 1 to m may be used. Also, in order to generally describe the columns of the data lines 14, panel pixels, or video pixels, an integer j from 1 to n may be used.

[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, …, m-th rows according to the control by the display control circuit 20, and sets the scanning signal to the selected scanning line 12 to the H level. Note that the scanning line driving circuit 130 sets the scanning signals to the scanning lines 12 other than the selected scanning line 12 to the L level. The data line driving circuit 140 outputs, via the data lines 14, the data signals supplied from the corresponding one of the conversion circuits 22a or 22b to the pixel circuits 110 in the 1st to n-th columns located on the scanning line 12 during the period when the scanning signal to the scanning line 12 is at the H level.

[0037] FIG. 8 is a diagram showing equivalent circuits of four pixel circuits 110 in a vertical two-row × horizontal two-column arrangement corresponding to the intersections of two adjacent scanning lines 12 and two adjacent data lines 14. 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 scanning line 12, its source node is connected to the data line 14, and its drain node is connected to a pixel electrode 118 having a square shape in plan view.

[0038] The common electrode 108 is provided in common for all the pixels so as to face the pixel electrode 118. A voltage LCcom is applied to the common electrode 108. Then, as described above, the liquid crystal 105 is sandwiched between the pixel electrode 118 and the common electrode 108. Therefore, for each pixel circuit 110, 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. In addition, a storage capacitor 109 is provided in parallel to the liquid crystal element 120. In the storage capacitor 109, one end is connected to the pixel electrode 118, and the other end is connected to the capacitor line 107. A voltage that is constant over time, for example, the same voltage LCcom as the voltage applied to the common electrode 108, is applied to the capacitor line 107. Since the pixel circuits 110 are arranged in a matrix over the horizontal direction, which is the extending direction of the scanning line 12, and the vertical direction, which is the extending direction of the data line 14, the pixel electrodes 118 included in the pixel circuits 110 are also arranged in a matrix over the vertical and horizontal directions.

[0039] In the scanning line 12 where the scanning signal becomes the H level, the transistor 116 of the pixel circuit 110 provided corresponding to the scanning line 12 becomes on. Due to the on state of the transistor 116, the data line 14 and the pixel electrode 118 are electrically connected, so that the data signal supplied to the data line 14 reaches the pixel electrode 118 through the on transistor 116. When the scanning line 12 becomes the L level, the transistor 116 becomes off, but the voltage of the data signal that has reached the pixel electrode 118 is held by the capacitance of the liquid crystal element 120 and the storage capacitor 109.

[0040] As is well known, in the liquid crystal element 120, the alignment 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 according to the effective value of the applied voltage. Note that the region that functions as a panel pixel in the liquid crystal element 120, that is, the region having a transmittance according to the effective value of the voltage, is the region where the pixel electrode 118 and the common electrode 108 overlap when the element substrate 101 and the counter substrate 102 are viewed in plan. Since the pixel electrode 118 is square in plan view, the shape of the panel pixel formed by the liquid crystal panel 100 is also square. In addition, in the present embodiment, the liquid crystal 105 is of the VA (Vertical Alignment) mode, in which the transmittance is the lowest when the voltage applied to the liquid crystal element 120 is zero, and the transmittance increases as the applied voltage increases, which is a normally black mode.

[0041] The writing operation for supplying a data signal to the pixel electrode 118 of the liquid crystal element 120 is executed in the order of the 1st, 2nd, 3rd, …, m-th rows. As a result, a voltage corresponding to the data signal is held in each of the liquid crystal elements 120 of the pixel circuits 110 arranged in m rows × n columns, and each liquid crystal element 120 has a target transmittance, and a transmission image is generated by the liquid crystal elements 120 arranged in m rows × n columns.

[0042] Note that since applying a DC voltage to the liquid crystal element 120 deteriorates the liquid crystal 105, 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 referred to as positive polarity writing, and the case where a data signal lower than the voltage LCcom is applied is referred to as negative polarity writing. Note that the reference of the polarity may be a voltage different from the voltage LCcom in consideration of the push-down of the transistor 116.

[0043] As described above, when synthesized by the prism 180, the arrangement of the panel pixels b is shifted by 0.5 pixel in the right direction with respect to the arrangement of the panel pixels a. For this reason, in the composite image of the transmission images by the liquid crystal panels 100a and 100b, the panel pixels are arranged in m rows × (2n) columns. Since the video pixels of the image specified by the video data Vid_in are arranged in (2m) rows × (2n) columns, in the composite image, the resolution in the vertical direction (column direction) is insufficient. Therefore, next, an operation for doubling the resolution in the vertical direction in the composite image for visual recognition will be described.

[0044] FIG. 9 is a diagram for explaining the operation of the projection display device 1 according to the embodiment. As shown in the figure, in this embodiment, one frame period (1F) is divided into an earlier odd field period (Odd-f) and a later even field period (Even-f) in terms of time. One frame period (1F) is a period during which one frame of the image represented by the video data Vid_in is supplied. When the frequency of the vertical synchronization signal included in the synchronization signal Sync is 60 Hz, it is 16.7 milliseconds per cycle.

[0045] In the embodiment, the odd field period (Odd-f) is a period during which the panel pixel a of the liquid crystal panel 100a represents the video pixels of odd rows and odd columns, and the panel pixel b of the liquid crystal panel 100b represents the video pixels of odd rows and even columns. That is, the odd field period (Odd-f) is a period during which the video pixels of odd rows are represented by the combined images of the panel pixels a and b. Note that, during the odd field period (Odd-f), the data signal Vid_a supplied by the conversion circuit 22a to the liquid crystal panel 100a corresponds to the gradation levels of the video pixels located at odd rows and odd columns. Also, during the odd field period (Odd-f), the data signal Vid_b supplied by the conversion circuit 22b to the liquid crystal panel 100b corresponds to the gradation levels of the video pixels located at odd rows and even columns.

[0046] The even field period (Even-f) is a period during which the panel pixel a of the liquid crystal panel 100a represents the video pixels of even rows and odd columns, and the panel pixel b of the liquid crystal panel 100b represents the video pixels of even rows and even columns. That is, the even field period (Even-f) is a period during which the video pixels of even rows are represented by the combined images of the panel pixels a and b. Note that, during the even field period (Even-f), the data signal Vid_a supplied by the conversion circuit 22a to the liquid crystal panel 100a corresponds to the gradation levels of the video pixels located at even rows and odd columns. Also, during the even field period (Even-f), the data signal Vid_b supplied by the conversion circuit 22b to the liquid crystal panel 100b corresponds to the gradation levels of the video pixels located at even rows and even columns.

[0047] Specifically, in the embodiment, during the odd field period (Odd-f), the panel pixel a at the i-th row and j-th column represents the video pixel at the (2i - 1)-th row and (2j - 1)-th column, and the panel pixel b at the i-th row and j-th column represents the video pixel at the (2i - 1)-th row and (2j)-th column. Also, during the even field period (Even-f), the panel pixel a at the i-th row and j-th column represents the video pixel at the (2i)-th row and (2j - 1)-th column, and the panel pixel b at the i-th row and j-th column represents the video pixel at the (2i)-th row and (2j)-th column. Note that both (2i - 1) and (2j - 1) are odd numbers, and both (2i) and (2j) are even numbers.

[0048] For a panel pixel to "represent" a certain video pixel means that the liquid crystal element 120 of the panel pixel is in a state where the transmittance corresponds to the gradation level (video pixel data) of the video pixel. Also, if one frame period (1F) is 16.7 milliseconds, then the odd field period (Odd-f) and the even field period (Even-f) are each 8.33 milliseconds, which is half of 16.7 milliseconds.

[0049] In the embodiment, the video pixel data Va supplied to the conversion circuit 22a specifies the gradation level of the video pixels located at odd rows and odd columns during the odd field period (Odd-f), and specifies the gradation level of the video pixels located at odd rows and even columns during the even field period (Even-f). The video pixel data Vb supplied to the conversion circuit 22b specifies the gradation level of the video pixels located at even rows and odd columns during the odd field period (Odd-f), and specifies the gradation level of the video pixels located at even rows and even columns during the even field period (Even-f).

[0050] The odd field period (Odd-f) is further divided into three unit periods. In each unit period, one panel pixel represents the RGB components of the corresponding video pixel individually. That is, in the three unit periods of the odd field period (Odd-f), one panel pixel represents the RGB components of the video pixel in color sequence, that is, in time division to represent color. Note that, during the odd field period (Odd-f), for a panel pixel, the period for expressing the R component of the video pixel in the odd rows is defined as OfL-R, the period for expressing the G component is defined as OfL-G, and the period for expressing the B component is defined as OfL-B.

[0051] Similarly, during the even field period (Even-f), for a panel pixel, it is divided into three periods: the unit period (EfL-R) for expressing the R component of the video pixel in the even rows, the unit (period EfL-G) for expressing the G component, and the period (EfL-B) for expressing the B component. Note that, if the odd field period (Odd-f) and the even field period (Even-f) are 8.33 milliseconds, the unit periods (OfL-R, OfL-G, OfL-B, EfL-R, EfL-G, EfL-B) are 2.78 milliseconds, which is 1 / 3 of 8.33 milliseconds. Furthermore, each of the unit periods (OfL-R, OfL-G, OfL-B, EfL-R, EfL-G, EfL-B) is further divided into a writing period (+) for writing a data signal with a positive polarity and a writing period (-) for writing a data signal with a negative polarity.

[0052] In an embodiment, the processing circuit 21 controls the optical path shift element 190 as follows. Taking the projection position during the odd field period (Odd-f) as the reference position, the processing circuit 21 shifts the projection position downward by 0.5 pixels of the panel pixel during the even field period (Even-f). When the even field period (Even-f) ends, the processing circuit 21 controls the optical path shift element 190 to shift the projection position upward by 0.5 pixels of the panel pixel during the odd field period to return to the reference position. Note that the downward direction is the vertical scanning direction, that is, the direction in which the scanning lines 12 are sequentially selected. In FIG. 4, for example, it is the direction from the panel pixel a1 to a3. Also, in FIG. 9, when the control signal to the optical path shift element 190 is at the H level, the projection position is at the reference position, and when it is at the L level, the projection position is shifted downward by 0.5 pixels of the panel pixel from the reference position.

[0053] The processing circuit 21 controls the light sources 151 and 152 as follows. Specifically, the processing circuit 21 first controls the laser light sources 151R and 152R to be in the on state and the other laser light sources to be in the off state during the unit period (OfL-R) in the odd field period (Odd-f) and the unit period (EfL-R) in the even field period (Even-f). Note that the on state of the laser light source means that the laser light source emits light, and the off state of the laser light source means that the laser light source does not emit light. Second, the processing circuit 21 controls the laser light sources 151G and 152G to be in the on state and the other laser light sources to be in the off state during the unit period (OfL-G) in the odd field period (Odd-f) and the unit period (EfL-G) in the even field period (Even-f). Third, the processing circuit 21 controls the laser light sources 151B and 152B to be in the on state and the other laser light sources to be in the off state during the unit period (OfL-B) in the odd field period (Odd-f) and the unit period (EfL-B) in the even field period (Even-f).

[0054] FIG. 10 is a diagram showing the time transition of the selected scanning line 12 in the liquid crystal panels 100a and 100b when the vertical axis represents the first row to the m-th row, which is the number of rows of the scanning line 12, and the horizontal axis represents the elapsed time. In the figure, the positive polarity writing period (+) in the unit period (OfL-R) is taken as an example. When the selection of the scanning line 12 is indicated by a thick black line, the scanning line 12 is exclusively selected one by one every 1 horizontal scanning period (1H). Therefore, the selected scanning line 12 sequentially shifts from the first row to the m-th row as time elapses. Note that the period following the positive polarity writing period (+) in the unit period (OfL-R) is the negative polarity writing period (-). Similarly, in the negative polarity writing period (-), the scanning line 12 is exclusively selected one by one every 1 horizontal scanning period (1H) in order from the first row to the m-th row. Also, here, the unit period (OfL-R) in the odd field period (Odd-f) has been described. However, for the unit periods (OfL-G, OfL-B), and further for each writing period of the unit periods (EfL-R, EfL-G, EfL-B) in the even field period (Even-f), similarly, the scanning line 12 is exclusively selected in order from the first row to the m-th row every one horizontal scanning period (1H).

[0055] FIG. 11 is a diagram showing which video pixels are represented at which projection positions by the panel pixels a and b in the first embodiment. Specifically, FIG. 11 is a diagram showing which of the video pixels shown in FIG. 3 are represented at which projection positions by the four panel pixels a1 to a4 in the upper left column of FIG. 4 and the four panel pixels b1 to b4 in the upper right column of FIG. 4 during the odd field period (Odd-f) and the even field period (Even-f).

[0056] As shown in the figure, during the odd field period (Odd-f), the panel pixels a1 to a4 sequentially represent the video pixels A1, A3, C1, and C3 in the odd rows and odd columns with hatching. In other words, for the panel pixels a1 to a4, during the unit periods (OfL-R, OfL-G, OfL-B) of the odd field period (Odd-f), the data signals of the R component, G component, and B component of the video pixels A1, A3, C1, and C3 are sequentially supplied, and the R, G, and B components are sequentially represented. Also, during the odd field period (Odd-f), the panel pixels b1 to b4 sequentially represent the video pixels A2, A4, C2, and C4 in the odd rows and even columns with hatching. In other words, for the panel pixels b1 to b4, during the unit periods (OfL-R, OfL-G, OfL-B) of the odd field period (Odd-f), the data signals of the R component, G component, and B component of the video pixels A2, A4, C2, and C4 are sequentially supplied, and the R, G, and B components are sequentially represented. Note that the arrow pointing upward in the panel pixel during the odd field period (Odd-f) indicates the shift direction from the projection position in the immediately preceding even field period (Even-f).

[0057] During the odd field period (Odd-f), the processing circuit 21 controls the laser light sources 151R and 152R to be in the on state during the unit period (OfL-R). Therefore, during this unit period (OfL-R), the R components of the video pixels A1, A3, C1, C3, A2, A4, C2, and C4 represented by the panel pixels a1 to a4 and b1 to b4 are visible to the user. Next, the processing circuit 21 controls the laser light sources 151G and 152G to be in the on state during the unit period (OfL-G). Therefore, the G components of the video pixels A1, A3, C1, C3, A2, A4, C2, and C4 represented by the panel pixels a1 to a4 and b1 to b4 are visible to the user. Then, the processing circuit 21 controls the laser light sources 151B and 152B to be in the on state during the unit period (OfL-B). Therefore, the B components of the video pixels A1, A3, C1, C3, A2, A4, C2, and C4 represented by the panel pixels a1 to a4 and b1 to b4 are visible to the user.

[0058] In this way, during the odd field period (Odd-f), among the video pixels, the RGB components of the video pixels in the odd rows are sequentially represented in color order, and as a result, the user views them in color.

[0059] When the odd field period (Odd-f) ends, the even field period (Even-f) begins. The processing circuit 21 controls the optical path shift element 190 to shift the projection position downward by 0.5 pixel of the panel pixels from the reference position in the figure.

[0060] During the even field period (Even-f), the panel pixels a1 to a4 sequentially represent the video pixels B1, B3, D1, and D3 in the even rows and odd columns with hatching. In other words, during the unit periods (EfL-R, EfL-G, EfL-B) of the even field period (Even-f), the panel pixels a1 to a4 are sequentially supplied with the data signals of the R component, G component, and B component of the video pixels B1, B3, D1, and D3, and the R, G, and B components are sequentially represented. Also, during the even-field period (Even-f), panel pixels b1 to b4 sequentially represent video pixels B2, B4, D2, and D4 in the even rows and even columns with hatching. In other words, data signals of the R component, G component, and B component of video pixels B2, B4, D2, and D4 are sequentially supplied to panel pixels b1 to b4 during the unit periods (EfL-R, EfL-G, EfL-B) of the even-field period (Even-f), and the R, G, and B components are sequentially represented. Note that the downward arrows in the panel pixels during the even-field period (Even-f) indicate the shift direction from the projection position in the immediately preceding odd-field period (Odd-f).

[0061] During the unit period (EfL-R) of the even-field period (Even-f), the processing circuit 21 controls the laser light sources 151R and 152R to be in the on state. Therefore, during this unit period (EfL-R), the R components of the video pixels B1, B3, D1, D3, B2, B4, D2, and D4 represented by panel pixels a1 to a4 and b1 to b4 are visible to the user. Next, during the unit period (EfL-G), the processing circuit 21 controls the laser light sources 151G and 152G to be in the on state. Therefore, the G components of the video pixels B1, B3, D1, D3, B2, B4, D2, and D4 represented by panel pixels a1 to a4 and b1 to b4 are visible to the user. Then, during the unit period (EfL-B), the processing circuit 21 controls the laser light sources 151B and 152B to be in the on state. Therefore, the B components of the video pixels B1, B3, D1, D3, B2, B4, D2, and D4 represented by panel pixels a1 to a4 and b1 to b4 are visible to the user.

[0062] In this way, during the even-field period (Even-f), as a result of the RGB components of the video pixels in the even rows being represented in color sequence among the video pixels, the user views them in color.

[0063] Therefore, when viewed through the odd field period (Odd-f) and the even field period (Even-f), the synthesized images and shifts of the liquid crystal panels 100a and 100b cause the video pixels arranged in (2m) rows × (2n) columns to be visually recognized by the user in color.

[0064] As described above, in the embodiment, the arrangement of the panel pixels b needs to be shifted 0.5 pixel of the panel pixels to the right in FIG. 4 with respect to the arrangement of the panel pixels a. In recent years, as the miniaturization and high definition of the liquid crystal panel 100 progress, one side of the panel pixel is narrowed down to, for example, about several μm. In order to make the liquid crystal panels 100a and 100b with narrowed panel pixels have the relationship shown in FIG. 4, extremely high accuracy is required for positioning. In order to meet such requirements, the projection display device 1 according to the embodiment is provided with a position adjustment element 195.

[0065] FIG. 12 is a diagram showing the configuration of the position adjustment element 195. The position adjustment element 195 includes a refractive plate 197, and actuators 198x and 198y. The refractive plate 197 is a plate-like member having transparency and a refractive index greater than 1.

[0066] The actuator 198x rotates the refractive plate 197 about the X axis in the direction and at the angle instructed by the processing circuit 21. The actuator 198y rotates the refractive plate 197 about the Y axis in the direction and at the angle instructed by the processing circuit 21. The X axis is an axis passing through the center Cen of the refractive plate 197 and parallel to the short side of the transmitted image by the liquid crystal panel 100b. The Y axis is an axis passing through the center Cen and parallel to the long side of the transmitted image by the liquid crystal panel 100b. When released from the control by the processing circuit 21 as in the case of power-off, the refractive plate 197 returns to the initial position. The initial position of the refractive plate 197 is preferably a position where the angle at which the transmitted image by the liquid crystal panel 100b enters the prism 180 is approximately zero.

[0067] As shown in Fig. 13, it is assumed that the refractive plate 197 is rotated by the actuator 198x by an angle θa in the clockwise direction from the initial position shown by the dashed line, as viewed from above the refractive plate 197 in the figure.

[0068] Fig. 14 is a diagram for explaining the shift of the transmitted image by the position adjustment element 195. When the light Lgt of the transmitted image by the liquid crystal panel 100b is incident on the refractive plate 197 at an incident angle of zero degrees in the case where the refractive plate 197 is at the initial position shown by the dashed line, the light Lgt travels straight through the refractive plate 197 and is emitted as the light Lgt1. On the other hand, when the refractive plate 197 rotates clockwise by an angle θa about the X-axis from the initial position, the light Lgt is refracted by the refractive plate 197 and is emitted after shifting by a distance x1 in the right direction compared to the light Lgt1. In other words, if it is to be shifted by a distance x1 in the right direction, the refractive plate 197 may be rotated clockwise by θa about the X-axis.

[0069] Although not particularly shown, when the refractive plate 197 rotates counterclockwise about the X-axis from the initial position, the light Lgt is refracted by the refractive plate 197 and is emitted after shifting in the left direction compared to the light Lgt1. Also, in Fig. 14, when the refractive plate 197 rotates clockwise as viewed from the right, the light Lgt is shifted downward, and when it rotates counterclockwise, the light Lgt is shifted upward.

[0070] Next, in the initialization process, the position adjustment by the position adjustment element 195 when the transmitted image of the liquid crystal panel 100b is incident on the prism 180 will be described.

[0071] Fig. 15 is a diagram for explaining the position adjustment by the position adjustment element 195. In the figure, "<before adjustment>" is a diagram showing the state immediately after the liquid crystal panels 100a and 100b are assembled and fixed, as a composite image by the prism 180. This state is the initial state when the power is off and is misaligned compared to the ideal state shown in Fig. 4.

[0072] In the figure, the <correction amount> is a value obtained by decomposing the shift amount required to shift the transmission image of the liquid crystal panel 100b from the position in the initial state to the position in the ideal state into components in the horizontal and vertical directions. In the example of the figure, it shows that the transmission image of the liquid crystal panel 100b should be shifted by a distance Amd_x in the right direction and a distance Amd_y in the upward direction from the position in the initial state to the position in the ideal state. The information indicating the correction amount is obtained by actually operating the angle of the position adjustment element 195 from the state where the liquid crystal panels 100a and 100b are assembled, that is, the state where the positions are shifted, to the ideal state before factory shipment in the manufacturing process of the projection display device 1.

[0073] The information indicating the obtained correction amount is stored in the memory element M of the processing circuit 21. In the initialization process immediately after power-on, the processing circuit 21 reads the information indicating the correction amount and designates the rotation direction and rotation amount to the actuators 198x and 198y based on the information. By this designation, the refractive plate 197 rotates, and the transmission image of the liquid crystal panel 100b reaches the position in the ideal state as shown in <after adjustment> with respect to the transmission image of the liquid crystal panel 100a. This ideal state continues until the power is turned off, and when the power is turned off, the refractive plate 197 returns to the initial position.

[0074] According to the embodiment, by using a configuration in which the liquid crystal panels 100a and 100b are shifted by 0.5 pixels of the panel pixels in the vertical direction, a color image with a resolution four times higher than the resolution of the liquid crystal panels 100a and 100b can be visually recognized by the user. In other words, in this embodiment, it is sufficient to use the liquid crystal panels 100a and 100b having a resolution of 1 / 4 of the resolution of the visually recognized image, so that it can be configured at a lower cost compared to the case of using a liquid crystal panel having the same resolution as the projected image. Further, according to the embodiment, the position of the transmissive image of the liquid crystal panel 100b synthesized by the prism 180 with respect to the transmissive image of the liquid crystal panel 100a is adjusted to an ideal state by the position adjustment element 195. Therefore, extremely high position accuracy is not required when attaching the liquid crystal panels 100a and 100b, so the production efficiency of the projection display device 1 can be increased.

[0075] In the above-described embodiments and the like, various modifications or applications are possible as follows.

[0076] In the embodiment, the arrangement of the panel pixels b in the liquid crystal panel 100b was shifted to the right by 0.5 pixels of the panel pixels with respect to the arrangement of the panel pixels a in the liquid crystal panel 100a, but the relationship is not limited to this. Although not particularly shown, the first modification example has a configuration in which the arrangement of the panel pixels b is shifted downward by 0.5 pixels of the panel pixels with respect to the arrangement of the panel pixels a. In the first modification example, for example, in the odd field period (Odd-f), the odd-numbered columns of the video pixels are expressed, and in the even field period (Even-f), the even-numbered columns of the video pixels are expressed. Further, in the first modification example, the processing circuit 21 controls the optical path shift element 190 as follows. The projection position in the odd field period (Odd-f) is set as the reference position. In the even field period (Even-f), the processing circuit 21 shifts the projection position to the right by 0.5 pixels of the panel pixels. When the even field period (Even-f) ends, the processing circuit 21 controls the optical path shift element 190 to shift the projection position to the left by 0.5 pixels of the panel pixels in the odd field period (Odd-f) and return it to the reference position. Here, the right direction is the horizontal scanning direction, and in FIG. 4, for example, it is the direction from the panel pixel a1 to a2.

[0077] In the embodiment, the position adjustment element 195 is provided between the polarizing plate 172b and the prism 180, and the position adjustment element 195 adjusts the position of the transmitted image of the liquid crystal panel 100b incident on the prism 180 based on the transmitted image of the liquid crystal panel 100a. However, the following configuration of the second modification may also be adopted.

[0078] FIG. 16 is a diagram showing the configuration of the projection display device 1 according to the second modification. In the second modification, the position adjustment element 195 is provided between the polarizing plate 172a and the prism 180, and the position adjustment element 195 adjusts the position of the transmitted image of the liquid crystal panel 100a incident on the prism 180 based on the transmitted image of the liquid crystal panel 100b.

[0079] In the configuration shown in FIG. 1 or FIG. 16, the transmitted image by one of the liquid crystal panels 100a or 100b is incident on the prism 180 through the position adjustment element 195. In this configuration, even if the distance from the liquid crystal panel 100a to the prism 180 is the same as the distance from the liquid crystal panel 100b to the prism 180, there is a difference in the optical path length by the amount passing through the position adjustment element 195 on one side. Therefore, there is a possibility that an influence such as a focus shift occurs in the synthesized image. Thus, a third modification for suppressing this influence will be described.

[0080] FIG. 17 is a diagram showing the configuration of the projection display device 1 according to the third modification. In the third modification, in the configuration where the position adjustment element 195 is provided between the liquid crystal panel 100b and the prism 180, an optical path length correction element 199 is provided between the liquid crystal panel 100a and the prism 180. A configuration in which the product of the refractive index and the thickness is equal between the refractive plate 197 and the optical path length correction element 199 is preferable. According to the third modification, it becomes easy to make the optical path lengths to the prism 180 equal, so that the influence due to the difference in the optical path difference can be suppressed.

[0081] FIG. 18 is a diagram showing the configuration of the projection display device 1 according to the fourth modification. In the fourth modification, a position adjustment element 195a is provided between the liquid crystal panel 100a and the prism 180, and a position adjustment element 195b is provided between the liquid crystal panel 100b and the prism 180. In this configuration, information indicating the correction amount of the position adjustment element 195a and information indicating the correction amount of the position adjustment element 195b are stored in the memory element M of the processing circuit 21. Then, in the initialization process, the processing circuit 21 reads the information indicating the correction amount of the position adjustment element 195a, controls the shift by the position adjustment element 195a based on the information, reads the information indicating the correction amount of the position adjustment element 195b, and controls the shift by the position adjustment element 195b based on the information.

[0082] According to the fourth modification, the influence of the optical path difference can be suppressed without using the optical path length correction element 199 in FIG. 17. In addition, the range in which position adjustment is possible can be expanded as compared with a configuration having only one of the position adjustment elements 195a or 195b. Also, in the fourth modification, one of the position adjustment elements 195a or 195b may be configured to shift the optical path in the left-right direction, for example, and the other of the position adjustment elements 195a or 195b may be configured to shift the optical path in the up-down direction. According to this configuration, each of the optical path shift element 190, the position adjustment elements 195a and 195b is configured to shift in one axis, and the elements can be made common, so that low cost can be expected.

[0083] In the embodiment, the liquid crystal panels 100a and 100b as the image light emitting devices are transmissive, but may be reflective. In addition, in the embodiment, the liquid crystal panels 100a and 100b are configured to express colors in a sequential color manner. However, for example, one panel pixel may be divided into RGB sub-pixels, and the three sub-pixels may be used to express colors. In this configuration, since one panel pixel has RGB sub-pixels, it is possible to express colors without using a sequential color method, that is, without dividing one field period into three unit periods.

[0084] In addition, the image light emitting device is not limited to the liquid crystal panel 100, and a self-emitting display panel may be used. A self-emitting panel refers to a display panel that generates an image by emitting light from its own display elements without using a light source like the liquid crystal panel 100. As the self-emitting panel, those using OLED (Organic Light Emitting Diode), micro LED (Light Emitting Diode), etc. for the display elements can be applied.

[0085] FIG. 19 is a diagram showing the configuration of the projection display device 1 according to the fifth modification example. In the fifth modification example, it is an example in which self-emitting panels 100c and 100d are applied instead of the liquid crystal panels 100a and 100b. In the self-emitting panels 100c and 100d, for example, OLEDs are used as the display elements. The self-emitting panels 100c and 100d both have RGB sub-pixels, and one panel pixel is composed of the RGB sub-pixels to express colors. In the fifth modification example, the relationship between the arrangement of the panel pixels in the self-emitting panel 100c and the arrangement of the panel pixels in the self-emitting panel 100d is that they are shifted by 0.5 pixels in the horizontal direction (row direction), which is the same as in the embodiment. In addition, since they have RGB sub-pixels, as described above, it is possible to express colors without dividing one field period into three unit periods.

[0086] Note that the light emitted by the OLED is non-polarized random light. Therefore, the polarization optical system 160a is provided between the self-luminous panel 100c and the prism 180, and the polarization optical system 160b is provided between the self-luminous panel 100d and the prism 180.

[0087] In addition, as the image light emitting device, for example, a mirror element in which the inclination of a mirror corresponds to on or off and reflects incident light in a predetermined direction only when in one of the on or off states can also be applied.

[0088] Note that in the embodiment and the first to fifth modification examples, the odd field period (Odd-f) is an example of the first field period, and the even field period (Even-f) is an example of the second field period. The position adjustment element 195 is an example of the first optical path shift element, and the optical path shift element 190 is an example of the second optical path shift element. If the position adjustment element 195a is an example of the first optical path shift element, the position adjustment element 195b is an example of the third optical path shift element. The transmitted image by the liquid crystal panel 100b is an example of the first image light, the light source 152 is an example of the first light source, the R component is an example of the light component of the first color, the G component is an example of the light component of the second color, the B component is an example of the light component of the third color, the light of S polarization is an example of the first polarized light, and the polarization optical system 160b is an example of the first 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 first image light emitting device. In addition, the transmitted image by the liquid crystal panel 100a is an example of the second image light, the light source 151 is an example of the second light source, the light of P polarization is an example of the second polarized light, and the polarization optical system 160a is an example of the second 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 second image light emitting device. The right direction is an example of the first direction, and the downward direction is an example of the second direction. The prism 180 is an example of the combining optical system.

[0089] From the forms exemplified above, for example, the following aspects can be grasped.

[0090] A projection display device according to one aspect 1 includes a first image light emitting device that emits first image light, a second image light emitting device that emits second image light, and a combining optical system that combines the first image light and the second image light in a state where the second image light is shifted in a first direction with respect to the first image light and emits the combined light as combined light. A first optical path shift element is provided between the first image light emitting device and the combining optical system to shift the optical path of the first image light emitted from the first image light emitting device, and a second optical path shift element is provided to shift the optical path of the combined light emitted from the combining optical system. And a display control circuit that controls the first image light emitting device, the second image light emitting device, the first optical path shift element, and the second optical path shift element. Video pixel data constituting video data is arranged along the first direction and a second direction intersecting the first direction. One frame period includes a first field period and a second field period. The display control circuit supplies, in the first field period, data signals of video pixels that are odd-numbered in the second direction of the arrangement and odd-numbered in the first direction to the first image light emitting device, and supplies data signals of video pixels that are odd-numbered in the second direction of the arrangement and even-numbered in the first direction to the second image light emitting device. In the second field period, data signals of video pixels that are even-numbered in the second direction of the arrangement and odd-numbered in the first direction are supplied to the first image light emitting device, and data signals of video pixels that are even-numbered in the second direction of the arrangement and even-numbered in the first direction are supplied to the second image light emitting device. The second optical path shift element is controlled to shift the optical path in the second direction from the position of the first field. 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. According to the projection display device according to aspect 1, high-resolution projection can be configured at low cost, and further, the production efficiency of the projection display device can be improved.

[0091] In the projection display device according to the specific mode 2 of mode 1, the first optical path shift element can shift the optical path in the first direction or the first opposite direction opposite to the first direction, and the second direction or the second opposite direction opposite to the second direction, and the second optical path shift element can shift the optical path in the second direction and the second opposite direction.

[0092] The projection display device according to the specific mode 3 of mode 1 includes an optical path length correction element provided between the second image light emitting device and the synthesis optical system.

[0093] The projection display device according to the specific mode 4 of mode 1 includes a third optical path shift element provided between the second image light emitting device and the synthesis optical system and shifting the optical path of the second image light.

[0094] In the projection display device according to the specific mode 5 of mode 1, the first image light emitting device includes a first liquid crystal panel, a first light source that emits 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. The first polarized light is incident on the first liquid crystal panel. The second image light emitting device includes a second liquid crystal panel, a second light source that emits 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. The second polarized light is incident on the second liquid crystal panel.

[0095] In the projection display device according to the specific mode 6 of mode 5, the first light source and the second light source are laser light sources that respectively emit first light including a red wavelength range, second light including a green wavelength range, and third light including a blue wavelength range.

[0096] In a projection display device according to another specific aspect 7 of aspect 6, the first liquid crystal panel in the first image light emitting device generates images of light components of the first color, the second color, and the third color by positive polarity writing and negative polarity writing respectively, and the second liquid crystal panel in the second image light emitting device generates images of light components of the first color, the second color, and the third color by positive polarity writing and negative polarity writing respectively.

[0097] In a projection display device according to any specific aspect 8 of aspects 5 to 7, in the first field period and the second field period, the first image light emitting device generates, in a time-division manner, light components of a first color, a second color, and a third color having different wavelengths among the first image light, and the second image light emitting device generates, in a time-division manner, light components of the first color, the second color, and the third color among the second image light.

[0098] In a projection display device according to another specific aspect 9 of aspect 1, the first image light emitting device includes a first self-luminous panel that emits the first image light and includes sub-pixels corresponding to a first color, a second color, and a third color having different wavelengths, and a first polarization conversion member that converts the emitted light from the first self-luminous panel into the first polarized light, and the second image light emitting device includes a second self-luminous panel that emits the second image light and includes sub-pixels of the first color, the second color, and the third color, and a second polarization conversion member that converts the emitted light from the second self-luminous panel into the second polarized light.

Explanation of reference numerals

[0099] 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, 195, 195a, 195b...Position adjustment element 195, 199...Optical path length correction element.

Claims

1. A first image light emitting device that emits first image light, A second image light emitting device that emits second image light, A combining optical system that combines the first image light and the second image light with the second image light shifted in a first direction with respect to the first image light and emits the combined light as combined light, A first optical path shift element provided between the first image light emitting device and the combining optical system, which shifts the optical path of the first image light emitted from the first image light emitting device, A second optical path shift element that shifts the 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, the first optical path shift element, and the second optical path shift element, comprising, Video pixel data constituting video data is arranged along the first direction and a second direction intersecting the first direction, One frame period includes a first field period and a second field period, The display control circuit, In the first field period, Supply the data signal of the video pixel that is odd-numbered in the second direction of the array and odd-numbered in the first direction to the first image light emitting device, and supply the data signal of the video pixel that is odd-numbered in the second direction of the array and even-numbered in the first direction to the second image light emitting device, In the second field period, Supply the data signal of the video pixel that is even-numbered in the second direction of the array and odd-numbered in the first direction to the first image light emitting device, and supply the data signal of the video pixel that is even-numbered in the second direction of the array and even-numbered in the first direction to the second image light emitting device, Control the second optical path shift element to shift the optical path in the second direction from the position of the first field, The first image light emitting device emits the first image light based on the supplied data signal, The second image light emitting device emits the second image light based on the supplied data signal A projection display device characterized by the above.

2. The first optical path shift element, The optical path can be shifted in the first direction or a first opposite direction opposite to the first direction, and in the second direction or a second opposite direction opposite to the second direction, The second optical path shift element, The optical path can be shifted in the second direction and the second opposite direction The projection display device according to claim 1.

3. Including an optical path length correction element provided between the second image light emitting device and the synthetic optical system The projection display device according to claim 1

4. Including a third optical path shift element provided between the second image light emitting device and the synthetic optical system for shifting the optical path of the second image light The projection display device according to claim 1

5. The first image light emitting device includes 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 first polarized light, And has The first polarized light is incident on the first liquid crystal panel, The second image light emitting device includes 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 second polarized light, And has The second polarized light is incident on the second liquid crystal panel The projection display device according to claim 1

6. The first light source and the second light source are respectively Laser light sources that emit first light including a red wavelength region, second light including a green wavelength region, and third light including a blue wavelength region The projection display device according to claim 5

7. The first liquid crystal panel in the first image light emitting device Generates images of light components of the first color, the second color, and the third color by positive polarity writing and negative polarity writing respectively, The second liquid crystal panel in the second image light emitting device Generates images of light components of the first color, the second color, and the third color by positive polarity writing and negative polarity writing respectively The projection display device according to claim 5

8. In the first field period and the second field period, The first image light emitting device Among the first image light, generates light components of a first color, a second color, and a third color having different wavelengths in a time-division manner, The second image light emitting device Among the second image light, generates light components of the first color, the second color, and the third color in a time-division manner The projection display device according to any one of claims 5 to 7

9. The first image light emitting device A first self-luminous panel that includes sub-pixels corresponding to a first color, a second color, and a third color having different wavelengths and emits the first image light, A first polarization conversion member that converts the light emitted from the first self-luminous panel into the first polarized light, And has The second image light emitting device A second self-luminous panel that emits the second image light, including sub-pixels of the first color, the second color, and the third color; A second polarization conversion member that converts the emitted light from the second self-luminous panel into the second polarized light; The projection display device according to claim 1, having the above.

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