Projection display device

Abstract

The present invention is provided with: a diffusion plate (3) that is irradiated with first blue light emitted from a first solid-state light source (2A) to thereby diffuse and emit the first blue light in a first direction parallel to a first axis in a prescribed plane; a fluorescent material (53) that is irradiated with second blue light, which is emitted from a second solid-state light source (2B) and which has a wavelength different from that of the first blue light, to thereby convert a portion of the second blue light into yellow light and emit the second blue light and the yellow light in a second direction parallel to a second axis orthogonal to the first axis in the prescribed plane; and a first color separation element (11) that allows transmission therethrough of the first blue light in the first direction, reflects the second blue light in the first direction to emit blue light resulting from mixture of the first blue light and the second blue light in the first direction, and allows transmission therethrough of the yellow light in the second direction.

Description

Projection display device

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

[0002] Generally, a projection display device including an illumination optical system that illuminates a plurality of light modulation elements with different color lights, a synthesis optical system that synthesizes the plurality of color lights modulated by the light modulation elements to generate synthesized light, and a projection optical system that projects the synthesized light generated by the synthesis optical system is known. In this type of projection display device, in order to reduce the occurrence of speckle noise and fringes in the projected light (synthesized light), a configuration including a plurality of blue laser light sources having different wavelengths has been proposed.

[0003] Japanese Patent Application Laid-Open No. 2012-008549

[0004] In the conventional configuration, in addition to a plurality of blue laser light sources, for example, a complicated configuration including a red light source is required, so the luminance of the projected light tends to be low, and there is room for improvement in this regard.

[0005] In view of the above problems, an object of the present disclosure is to provide a projection display device that can reduce the occurrence of speckle noise and fringes in the projected light and appropriately suppress a decrease in the luminance of this light.

[0006] The projection display device according to the present embodiment includes a diffusion plate that is irradiated with first blue light emitted from a first light source and diffuses and emits the first blue light in a first direction parallel to a first axis in a predetermined plane, a phosphor that is irradiated with second blue light emitted from a second light source and having a different wavelength from the first blue light, converts a part of the second blue light into yellow light, and emits the second blue light and the yellow light in a second direction parallel to a second axis orthogonal to the first axis in the predetermined plane, and a first color molecule element that transmits the first blue light in the first direction, reflects the second blue light in the first direction, emits blue light obtained by mixing the first blue light and the second blue light in the first direction, and transmits the yellow light in the second direction.

[0007] According to the present embodiment, a projection display device that can reduce the occurrence of speckle noise and fringes in the projected light and appropriately suppress a decrease in the luminance of this light is provided.

[0008] Figure 1 is a schematic plan view showing an example of a projection-type display device according to this embodiment. Figure 2 is a schematic perspective view showing an example of a projection-type display device according to this embodiment. Figure 3 is a graph showing the characteristics of the light transmittance of the first color separation element and the wavelength of light emitted from each light source device. Figure 4 is a plan view for explaining the operation of the projection-type display device according to this embodiment.

[0009] Embodiments relating to this disclosure will be described with reference to the drawings, but this disclosure is not limited thereto. The components of the embodiments described below can be combined as appropriate. In addition, some components may not be used.

[0010] In the following description, an XYZ Cartesian coordinate system is established, and the positional relationships of each part are described with reference to this XYZ Cartesian coordinate system. The direction parallel to the X-axis, which is the first axis within the predetermined plane, is the X-axis direction. The direction parallel to the Y-axis, which is the second axis perpendicular to the first axis within the predetermined plane, is the Y-axis direction. The direction parallel to the Z-axis, which is the third axis perpendicular to both the first and second axes, is the Z-axis direction. The third axis is perpendicular to the predetermined plane. In addition, one direction in the X-axis direction is defined as the +X direction, and the opposite direction of the +X direction is defined as the -X direction. One direction in the Y-axis direction is defined as the +Y direction, and the opposite direction of the +Y direction is defined as the -Y direction. One direction in the Z-axis direction is defined as the +Z direction, and the opposite direction of the +Z direction is defined as the -Z direction. In this embodiment, the predetermined plane is parallel to the horizontal plane, and the Z-axis direction is the vertical direction. In the following description, the predetermined plane will be appropriately referred to as the XY plane.

[0011] Figure 1 is a schematic plan view showing an example of the projection display device 100 according to this embodiment. Figure 2 is a schematic perspective view showing an example of the projection display device 100 according to this embodiment. As shown in Figures 1 and 2, the projection display device 100 includes a light source device 1 that generates light, an illumination optical system 10 having a first color separation element 11 and a second color separation element 12 that separates the light emitted from the light source device 1 by color to generate first color light (blue light) Lb, second color light (green light) Lg, and third color light (red light) Lr, and is arranged in the optical paths of the first color light Lb, second color light Lg, and third color light Lr generated by the illumination optical system 10, and based on image data, first color light The system comprises a first reflective liquid crystal panel 31, a second reflective liquid crystal panel 32, and a third reflective liquid crystal panel 33, each of which modulates Lb, a second color light Lg, and a third color light Lr, respectively; a synthesis optical system 40 that combines the first color light Lb, the second color light Lg, and the third color light Lr, which are modulated by the first reflective liquid crystal panel 31, the second reflective liquid crystal panel 32, and the third reflective liquid crystal panel 33, to generate composite light; and a projection optical system 50 that projects the composite light generated by the synthesis optical system 40.

[0012] The light source device 1 comprises a first light source device 1A and a second light source device 1B to generate two types of light. In this embodiment, the first light source device 1A includes a first solid-state light source (first light source unit) 2A that emits first blue light of a specific wavelength (for example, 465 nm), a diffuser plate 3 that diffuses the first blue light when irradiated with the first blue light, a half-mirror 4 that guides the first blue light emitted from the first solid-state light source 2A to the diffuser plate 3, and a focusing optical system 5 that focuses the first blue light irradiated onto the diffuser plate 3. The first solid-state light source 2A includes a laser diode (LD). The diffuser plate 3 diffuses and reflects the blue laser light (first blue light) emitted from the first solid-state light source 2A. The first blue light generated by the first light source device 1A is incident on the illumination optical system 10.

[0013] In this embodiment, the second light source device 1B includes a second solid-state light source 2B (second light source unit) that emits excitation light, a phosphor 53 that generates fluorescence when irradiated with excitation light, a half mirror 4 that guides the excitation light emitted from the second solid-state light source 2B to the phosphor 53, and a focusing optical system 5 that focuses the excitation light irradiated onto the phosphor 53. The second solid-state light source 2B includes a laser diode (LD) similar to the first solid-state light source 2A. The second solid-state light source 2B emits a second blue light (blue laser light) with a different wavelength from the first blue light as excitation light. Specifically, the second solid-state light source 2B emits a second blue light with a shorter wavelength (for example, 455 nm) than the first blue light. The second blue light emitted from the second solid-state light source 2B as excitation light is irradiated onto the phosphor 53 via the half mirror 4 and the focusing optical system 5. When the second blue light is irradiated, the phosphor 53 generates yellow fluorescence (referred to as yellow light) due to a portion of the second blue light, and reflects this yellow light and the second blue light. White light is generated based on the yellow light and the second blue light. The white light (yellow light and second blue light) generated in the second light source device 1B is incident on the illumination optical system 10. The half mirror 4 may be made of a dichroic mirror. Specifically, it may be configured to reflect one polarization of the second blue light and transmit the other polarization of the second blue light and the yellow light. Also, the characteristics of the half mirror 4 of the first light source device and the half mirror 4 of the second light source device may be different.

[0014] The illumination optical system 10 generates multiple colored lights Lb, Lg, and Lr by separating the light emitted from the light source device 1 by color. The illumination optical system 10 includes a first integrator optical system 51 into which light emitted from the first light source device 1A is incident, and a second integrator optical system 52 into which light emitted from the second light source device 1B is incident. The illumination optical system 10 also includes a first color separation element 11 that separates the first colored light Lb from the light emitted from the first integrator optical system 51 and the second integrator optical system 52, respectively, and emits it in the -X direction, and a second color separation element 12 that separates the yellow light Lgr emitted from the first color separation element 11 into the second colored light Lg and the third colored light Lr, and emits the second colored light Lg in the -X direction and the third colored light Lr in the +Y direction. Furthermore, the illumination optical system 10 includes a first reflective member 13 that reflects the first color light Lb emitted from the first color separation element 11 in the +Z direction, a second reflective member 14 that reflects the second color light Lg emitted from the second color separation element 12 in the +Z direction, a third reflective member 15 that reflects the third color light Lr emitted from the second color separation element 12 in the +Z direction, and a relay optical system 20 arranged in the optical path of the first color light Lb to form an erect image.

[0015] The first integrator optical system 51 and the second integrator optical system 52 equalize the illuminance of the light emitted from the first light source device 1A and the second light source device 1B, respectively. The first integrator optical system 51 and the second integrator optical system 52 each include a first lens array 6A, a second lens array 6B, a polarization conversion element 7, and a condenser lens 8. The optical axis of the first integrator optical system 51 is parallel to the X-axis, and the light emitted from the first integrator optical system 51 travels in the -X direction. The optical axis of the second integrator optical system 52 is parallel to the Y-axis, and the light emitted from the second integrator optical system 52 travels in the +Y direction.

[0016] The first lens array 6A has a plurality of lenses arranged in a matrix in the YZ plane or the XZ plane. The second lens array 6B has a plurality of lenses arranged in a matrix in the YZ plane or the XZ plane. There is a one-to-one correspondence between the plurality of lenses in the first lens array 6A and the plurality of lenses in the second lens array 6B. The polarization conversion element 7 has a plurality of polarization conversion units. Each polarization conversion unit includes a polarization separation film, a reflective mirror, and a phase plate. There is a one-to-one correspondence between the plurality of lenses in the second lens array 6B and the plurality of polarization conversion units in the polarization conversion element 7.

[0017] Light incident on the first integrator optical system 51 or the second integrator optical system 52 is incident on each of the multiple lenses of the first lens array 6A. Depending on the position of the lens, a portion of the light incident on each incident surface of the first integrator optical system 51 or the second integrator optical system 52 is incident on each of the multiple lenses of the first lens array 6A. Therefore, the light received by each lens is different. Each lens of the first lens array 6A focuses the light emitted from the first light source device 1A or the second light source device 1B onto the corresponding lens of the second lens array 6B. A secondary light source image is formed on each of the multiple lenses of the second lens array 6B.

[0018] Light from the secondary light source image formed on each lens of the second lens array 6B is incident on each polarization conversion unit of the polarization conversion element 7 corresponding to the lens of the second lens array 6B. The light incident on the polarization conversion unit is separated into light in a first polarization state and light in a second polarization state by a polarization separation film. The light in the second polarization state separated by the polarization separation film is reflected by a reflection mirror and then converted back into light in a first polarization state by passing through a phase plate. In other words, the light emitted from the first light source device 1A or the second light source device 1B is converted back into light in a first polarization state by passing through the polarization conversion element 7.

[0019] Light emitted from each of the multiple polarization conversion units enters the condenser lens 8. The condenser lens 8 superimposes the light emitted from each of the multiple polarization conversion units into a single luminous beam. As a result, the illuminance distribution in the first reflective liquid crystal panel 31, the second reflective liquid crystal panel 32, and the third reflective liquid crystal panel 33 is made uniform.

[0020] The first color separation element 11 is positioned on the -X side of the first integrator optical system 51 and on the +Y side of the second integrator optical system 52. That is, the first color separation element 11 is positioned where the light emitted from the first integrator optical system 51 and the light emitted from the second integrator optical system 52 intersect. The first color separation element 11 includes a dichroic mirror. The first color separation element 11 transmits the light (first blue light) emitted from the first light source device 1A and transmitted through the first integrator optical system 51, and separates the second blue light from the light (second blue light and yellow light) emitted from the second light source device 1B and transmitted through the second integrator optical system 52.

[0021] Figure 3 is a graph showing the characteristics of the light transmittance of the first color separation element and the wavelength of light emitted from each light source device. In Figure 3, reference numeral 101 indicates the relationship between the light transmittance and wavelength in the first color separation element 11. Reference numeral 102 indicates the wavelength of light including the first blue light emitted from the first light source device 1A. Reference numeral 103 indicates the wavelength of light including the second blue light and yellow light emitted from the second light source device 1B.

[0022] In this embodiment, as shown in Figure 3, the first color separation element 11 has the characteristic of transmitting light with a wavelength of approximately 460 nm or more. That is, the first color separation element 11 has the characteristic of decreasing light transmittance in the range of less than approximately 460 nm and hardly transmitting any light in the range of approximately 455 nm or less. In this case, the first blue light emitted from the first light source device 1A has a wavelength of 465 nm and therefore passes through the first color separation element 11. Also, the second blue light emitted from the second light source device 1B has a wavelength of 455 nm, and the yellow light obtained by converting a portion of the second blue light by the phosphor 53 has a wavelength of approximately 560 nm. Therefore, as shown in Figure 1, the first color separation element 11 transmits the first blue light Lb1 emitted from the first light source device 1A, and this first blue light Lb1 propagates in the -X direction. Furthermore, the first color separation element 11 separates the white light emitted from the second light source device 1B into a second blue light Lb2 and yellow light Lgr, which has a different wavelength from the blue light. The second blue light Lb2 is reflected by the first color separation element 11 and propagates in the -X direction. Here, the first blue light Lb1 and the second blue light Lb2 are combined (mixed) to become the first color light (blue light) Lb. In other words, in this embodiment, the first color light (blue light) Lb is generated by multiple (two) blue lights with different wavelengths. On the other hand, the yellow light Lgr, which has a different wavelength from the blue light, passes through the first color separation element 11 and propagates in the +Y direction.

[0023] In this embodiment, as described above, the first blue light and the second blue light, which have different wavelengths, are combined (mixed) by the first color separation element 11 to form the first color light (blue light) Lb. Therefore, the difference in oscillation wavelengths changes the spacing of the fringes and the position of the peaks and valleys, thereby reducing the generation of speckle noise and fringes in the projected light (combined light). Furthermore, since the first light source device 1A is equipped with a diffuser plate 3 that diffuses and emits the first blue light in the -X direction parallel to the X axis, speckle noise and fringes can be further reduced.

[0024] The second color separation element 12 is positioned on the +Y side of the first color separation element 11. The second color separation element 12 includes a dichroic mirror. The second color separation element 12 separates yellow light Lgr, which has a different wavelength from the blue light emitted from the first color separation element 11, into second color light Lg and third color light Lr. In this embodiment, the second color separation element 12 separates the yellow light Lgr emitted from the first color separation element 11 into green light, which is the second color light Lg, and red light, which is the third color light Lr. The second color light Lg, which is green light, is reflected by the second color separation element 12 and propagates in the -X direction. The third color light Lr, which is red light, passes through the second color separation element 12 and propagates in the +Y direction.

[0025] The first reflective member 13 reflects the first color light Lb emitted from the first color separation element 11 in the +Z direction. In this embodiment, the illumination optical system 10 has a fourth reflective member 16 disposed between the first color separation element 11 and the first reflective member 13. The fourth reflective member 16 reflects the first color light Lb emitted from the first color separation element 11 in the +Y direction. The fourth reflective member 16 is positioned on the -X side of the first color separation element 11. The first color light Lb traveling from the first color separation element 11 in the -X direction is reflected by the reflective surface 16A of the fourth reflective member 16 and travels in the +Y direction. The first reflective member 13 is positioned on the +Y side of the fourth reflective member 16. The first color light Lb traveling from the fourth reflective member 16 in the +Y direction is reflected by the reflective surface 13A of the first reflective member 13 and travels in the +Z direction.

[0026] The second reflective member 14 reflects the second color light Lg emitted from the second color separation element 12 in the +Z direction. The second reflective member 14 is positioned on the -X side of the second color separation element 12. The second color light Lg traveling from the second color separation element 12 in the -X direction is reflected by the reflective surface 14A of the second reflective member 14 and travels in the +Z direction.

[0027] The third reflective member 15 reflects the third color light Lr emitted from the second color separation element 12 in the +Z direction. The third reflective member 15 is positioned on the +Y side of the second color separation element 12. The third color light Lr traveling from the second color separation element 12 in the +Y direction is reflected by the reflective surface 15A of the third reflective member 15 and travels in the +Z direction.

[0028] In this embodiment, the reflective surface 13A of the first reflective member 13 and the reflective surface 15A of the third reflective member 15 are parallel. The reflective surface 13A of the first reflective member 13 is parallel to the X-axis and inclined in the +Z direction toward the +Y direction. Similarly, the reflective surface 15A of the third reflective member 15 is parallel to the X-axis and inclined in the +Z direction toward the +Y direction.

[0029] In this embodiment, the reflective surface 13A of the first reflective member 13 and the reflective surface 15A of the third reflective member 15 are arranged in the same plane. The plane containing the reflective surface 13A of the first reflective member 13 and the reflective surface 15A of the third reflective member 15 is orthogonal to the plane containing the reflective surface 14A of the second reflective member 14. In this embodiment, the reflective surface 14A of the second reflective member 14 is parallel to the Y-axis and inclined in the +Z direction toward the -X direction.

[0030] The relay optical system 20 is positioned in the optical path of the first color light Lb between the first color separation element 11 and the first reflective liquid crystal panel 31. In this embodiment, the relay optical system 20 is positioned in the optical path of the first color light Lb between the first color separation element 11 and the first reflective member 13. The relay optical system 20 forms an erect image of the object on the object plane side of the relay optical system 20 onto the image plane side of the relay optical system 20.

[0031] The relay optical system 20 includes a first condensing lens 21 positioned between the first color separation element 11 and the fourth reflective member 16, and a second condensing lens 22 and a third condensing lens 23 positioned between the fourth reflective member 16 and the first reflective member 13. The first condensing lens 21, the second condensing lens 22, and the third condensing lens 23 are each convex lenses. The third condensing lens 23 is optically conjugate to the second lens array 6B. The third condensing lens 23 and the second lens array 6B are optically conjugate, and the images of each lens of the first lens array 6A are formed between the second lens array 6B and the third condensing lens 23.

[0032] In this embodiment, the relay optical system 20 forms an upright image of an object on the image plane side of the relay optical system 20. For example, when an image X is formed on the object plane side of the relay optical system 20, the relay optical system 20 forms an inverted image of the image X between the first color separation element 11 and the first reflective liquid crystal panel 31, which is the image plane, and forms an upright image of the image X on the image plane side of the relay optical system 20. In this embodiment, the image X refers to each of the images of a portion of the light emitted from the light source device 1 and received by each of the multiple lenses of the first lens array 6A.

[0033] The first reflective liquid crystal panel 31 is positioned in the optical path of the first color light Lb. The first reflective liquid crystal panel 31 is an optical modulation element that modulates the first color light Lb from the first reflective member 13 based on image data. The first reflective liquid crystal panel 31 is positioned on the +Z side of the first reflective member 13. The first color light Lb traveling in the +Z direction from the first reflective member 13 is incident on the first reflective liquid crystal panel 31.

[0034] The first reflective liquid crystal panel 31 has a first incident surface 31A to which the first color light Lb from the first reflective member 13 is incident. The first reflective liquid crystal panel 31 reflects the first color light Lb from the first reflective member 13 in the -Z direction.

[0035] The second reflective liquid crystal panel 32 is positioned in the optical path of the second color light Lg. The second reflective liquid crystal panel 32 is an optical modulation element that modulates the second color light Lg from the second reflective member 14 based on image data. The second reflective liquid crystal panel 32 is positioned on the +Z side of the second reflective member 14. The second color light Lg traveling in the +Z direction from the second reflective member 14 is incident on the second reflective liquid crystal panel 32.

[0036] The second reflective liquid crystal panel 32 has a second incident surface 32A to which the second color light Lg from the second reflective member 14 is incident. The second reflective liquid crystal panel 32 reflects the second color light Lg from the second reflective member 14 in the -Z direction.

[0037] The third reflective liquid crystal panel 33 is positioned in the optical path of the third color light Lr. The third reflective liquid crystal panel 33 is an optical modulation element that modulates the third color light Lr from the third reflective member 15 based on image data. The third reflective liquid crystal panel 33 is positioned on the +Z side of the third reflective member 15. The third color light Lr traveling in the +Z direction from the third reflective member 15 is incident on the third reflective liquid crystal panel 33.

[0038] The third reflective liquid crystal panel 33 has a third incident surface 33A to which the third color light Lr from the third reflective member 15 is incident. The third reflective liquid crystal panel 33 reflects the third color light Lr from the third reflective member 15 in the -Z direction.

[0039] The first incident surface 31A of the first reflective liquid crystal panel 31 is parallel to the XY plane and faces the -Z direction. Similarly, the second incident surface 32A of the second reflective liquid crystal panel 32 and the third incident surface 33A of the third reflective liquid crystal panel 33 are parallel to the XY plane and face the -Z direction. In this embodiment, the first incident surface 31A of the first reflective liquid crystal panel 31, the second incident surface 32A of the second reflective liquid crystal panel 32, and the third incident surface 33A of the third reflective liquid crystal panel 33 face the same direction and are arranged in the same plane parallel to the XY plane.

[0040] The first polarizer 61 and the second polarizer 62 are positioned in the optical path of the first color light Lb between the first reflective member 13 and the first reflective liquid crystal panel 31. The third polarizer 63 and the fourth polarizer 64 are positioned in the optical path of the second color light Lg between the second reflective member 14 and the second reflective liquid crystal panel 32. The fifth polarizer 65 and the sixth polarizer 66 are positioned in the optical path of the third color light Lr between the third reflective member 15 and the third reflective liquid crystal panel 33.

[0041] The first polarizer 61 transmits the first color light Lb in the first polarization state reflected by the first reflective member 13. The first color light Lb in the first polarization state that has passed through the first polarizer 61 passes through the second polarizer 62 and is incident on the first reflective liquid crystal panel 31. The first reflective liquid crystal panel 31 optically modulates the first color light Lb that has passed through the first polarizer 61 and the second polarizer 62 based on image data. The second polarizer 62 is positioned in the optical path of the first color light Lb between the first polarizer 61 and the first reflective liquid crystal panel 31. The second polarizer 62 transmits the first color light Lb in the first polarization state from the first polarizer 61, and the first color light Lb in the second polarization state that has been incident on the first reflective liquid crystal panel 31 via the first polarizer 61 and reflected by the first reflective liquid crystal panel 31 is reflected back to the composite optical system 40.

[0042] The third polarizer 63 transmits the second-color light Lg in the first polarization state reflected by the second reflective member 14. The second-color light Lg in the first polarization state that has passed through the third polarizer 63 passes through the fourth polarizer 64 and is incident on the second reflective liquid crystal panel 32. The second reflective liquid crystal panel 32 optically modulates the second-color light Lg that has passed through the third polarizer 63 and the fourth polarizer 64 based on image data. The fourth polarizer 64 is positioned in the optical path of the second-color light Lg between the third polarizer 63 and the second reflective liquid crystal panel 32. The fourth polarizer 64 transmits the second-color light Lg in the first polarization state from the third polarizer 63, and the second-color light Lg in the second polarization state that has been incident on the second reflective liquid crystal panel 32 via the third polarizer 63 and reflected by the second reflective liquid crystal panel 32 is reflected back to the composite optical system 40.

[0043] The fifth polarizer 65 transmits the third color light Lr in the first polarization state reflected by the third reflecting member 15. The third color light Lr in the first polarization state that has passed through the fifth polarizer 65 passes through the sixth polarizer 66 and is incident on the third reflective liquid crystal panel 33. The third reflective liquid crystal panel 33 optically modulates the third color light Lr that has passed through the fifth polarizer 65 and the sixth polarizer 66 based on the image data. The sixth polarizer 66 is disposed in the optical path of the third color light Lr between the fifth polarizer 65 and the third reflective liquid crystal panel 33. The sixth polarizer 66 transmits the third color light Lr in the first polarization state from the fifth polarizer 65, is incident on the third reflective liquid crystal panel 33 via the fifth polarizer 65, and reflects the third color light Lr in the second polarization state reflected by the third reflective liquid crystal panel 33 to the synthesis optical system 40.

[0044] A transmissive polarizer 67 is disposed in the optical path of the first color light Lb between the second polarizer 62 and the synthesis optical system 40. The transmissive polarizer 67 transmits the first color light Lb in the second polarization state among the first color lights Lb emitted from the second polarizer 62 to the synthesis optical system 40, and prevents the transmission of the unnecessary first color light Lb in the first polarization state.

[0045] A transmissive polarizer 68 is disposed in the optical path of the second color light Lg between the fourth polarizer 64 and the synthesis optical system 40. The transmissive polarizer 68 transmits the second color light Lg in the second polarization state among the second color lights Lg emitted from the fourth polarizer 64 to the synthesis optical system 40, and prevents the transmission of the unnecessary second color light Lg in the first polarization state.

[0046] A transmissive polarizer 69 is disposed in the optical path of the third color light Lr between the sixth polarizer 66 and the synthesis optical system 40. The transmissive polarizer 69 transmits the third color light Lr in the second polarization state among the third color lights Lr emitted from the sixth polarizer 66 to the synthesis optical system 40, and prevents the transmission of the unnecessary third color light Lr in the first polarization state. Here, the first polarization state is, for example, the P polarization state. The second polarization state is, for example, the S polarization state.

[0047] In this embodiment, the projection display device 100 is configured such that the optical path length from the second color separation element 12 to the second reflective liquid crystal panel 32 corresponding to green light is the same as the optical path length from the second color separation element 12 to the third reflective liquid crystal panel 33 corresponding to red light, and optical components arranged in each optical path for green light and red light are also equivalent. Therefore, the green light and red light separated by the second color separation element 12 can be appropriately transmitted to the second reflective liquid crystal panel 32 and the third reflective liquid crystal panel 33, and can be imaged by the second reflective liquid crystal panel 32 and the third reflective liquid crystal panel 33, respectively. On the other hand, the optical path length from the first color separation element 11 to the first reflective liquid crystal panel 31 corresponding to blue light is set to be longer than the above-described green light and red light. In the optical path of this blue light, by providing the relay optical system 20, after imaging once within the optical path, it can be re-imaged by the first reflective liquid crystal panel 31 through the relay optical system 20.

[0048] In this embodiment, the first, second, and third incident surfaces 31A, 32A, 33A of the first, second, and third reflective liquid crystal panels 31, 32, 33 and each of the plurality of lenses of the first lens array 6A are optically conjugate. Therefore, at the first, second, and third incident surfaces 31A, 32A, 33A of the first, second, and third reflective liquid crystal panels 31, 32, 33, the images of the plurality of lenses of the first lens array 6A are superimposed on each other. As a result, the illuminance distribution at the first, second, and third incident surfaces 31A, 32A, 33A of the first, second, and third reflective liquid crystal panels 31, 32, 33 is made uniform.

[0049] The synthetic optical system 40 synthesizes the first color light Lb optically modulated by the first reflective liquid crystal panel 31, the second color light Lg optically modulated by the second reflective liquid crystal panel 32, and the third color light Lr optically modulated by the third reflective liquid crystal panel 33 to generate synthetic light. In this embodiment, the synthetic optical system 40 includes a cross dichroic prism. The synthetic optical system 40 has an incident surface 41 on which the first color light Lb optically modulated by the first reflective liquid crystal panel 31 is incident, an incident surface 42 on which the second color light Lg optically modulated by the second reflective liquid crystal panel 32 is incident, an incident surface 43 on which the third color light Lr optically modulated by the third reflective liquid crystal panel 33 is incident, and an emission surface 46 that emits the synthetic light.

[0050] The incident surface 41 is parallel to the YZ plane and faces the -X direction. The incident surface 42 is parallel to the XZ plane and faces the -Y direction. The incident surface 43 is parallel to the YZ plane and faces the +X direction. The ejection surface 46 is parallel to the XZ plane and faces the +Y direction.

[0051] The composite optical system 40 has a first composite surface 44 that combines the first color light Lb incident from the incident surface 41 and the second color light Lg incident from the incident surface 42, and a second composite surface 45 that combines the third color light Lr incident from the incident surface 43 and the second color light Lg incident from the incident surface 42. The first composite surface 44 and the second composite surface 45 are parallel to the Z axis. The first composite surface 44 and the second composite surface 45 are orthogonal to each other.

[0052] The first composite surface 44 is emitted from the first reflective liquid crystal panel 31 and reflects the first color light Lb incident from the incident surface 41 via the second polarizer 62. The first composite surface 44 is emitted from the second reflective liquid crystal panel 32 and transmits the second color light Lg incident from the incident surface 42 via the fourth polarizer 64.

[0053] The second composite surface 45 is emitted from the second reflective liquid crystal panel 32 and transmits the second color light Lg incident from the incident surface 42 via the fourth polarizer 64. The second composite surface 45 is emitted from the third reflective liquid crystal panel 33 and reflects the third color light Lr incident from the incident surface 43 via the sixth polarizer 66.

[0054] The projection optical system 50 is generated by the composite optical system 40 and projects the composite light emitted from the emission surface 46 onto the screen 70. The projection optical system 50 is optically conjugate to the second lens array 6B. The surface of the screen 70 is also optically conjugate to each of the multiple lenses of the first lens array 6A.

[0055] Next, the operation of the projection display device 100 according to this embodiment will be described. Figure 4 is a perspective view illustrating the operation of the projection display device 100 according to this embodiment. In this embodiment, when there is a bias in the intensity distribution of the light emitted from the second light source device 1B of the light source device 1, the optical system of the projection display device 100, including the illumination optical system 10, is constructed such that the bias in the light intensity distribution formed on the emission surface 46 side (image plane side of the projection optical system 50) of the composite optical system 40 by a plurality of optical components arranged in the optical path of the first color light Lb, the bias in the light intensity distribution formed on the emission surface 46 side (image plane side of the projection optical system 50) of the composite optical system 40 by a plurality of optical components arranged in the optical path of the second color light Lg, and the bias in the light intensity distribution formed on the emission surface 46 side (image plane side of the projection optical system 50) of the composite optical system 40 by a plurality of optical components arranged in the optical path of the third color light Lr coincide. The first blue light Lb1 from the first light source device 1A overlaps with the second blue light Lb2 to form the first color light Lb. However, if the bias in the light intensity distribution of the first blue light Lb1 is sufficiently small due to the effect of the diffuser plate 3, the bias in the light intensity distribution of the combined first color light Lb will be dominated by the bias of the second blue light Lb2. Therefore, the biases in the light intensity distributions of the first color light Lb, the second color light Lg, and the third color light Lr will be the same.

[0056] In the following description, the optical system composed of multiple optical components arranged in the optical path of the first color light Lb will be appropriately referred to as the first color light optical system 81, the optical system composed of multiple optical components arranged in the optical path of the second color light Lg will be appropriately referred to as the second color light optical system 82, and the optical system composed of multiple optical components arranged in the optical path of the third color light Lr will be appropriately referred to as the third color light optical system 83.

[0057] The first color optical system 81 includes a first color separation element 11, a fourth reflective member 16, a first reflective member 13, a relay optical system 20, a first polarizer 61, a second polarizer 62, and a first reflective liquid crystal panel 31.

[0058] The second-color optical system 82 includes a first-color separation element 11, a second-color separation element 12, a second-reflective member 14, a third-color polarizer 63, a fourth-color polarizer 64, and a second-reflective liquid crystal panel 32.

[0059] The third-color optical system 83 includes a first-color separation element 11, a second-color separation element 12, a third-reflective member 15, a fifth-color polarizer 65, a sixth-color polarizer 66, and a third-color reflective liquid crystal panel 33.

[0060] In this embodiment, the bias in the light intensity distribution of the light source device 1 formed on the exit surface 46 side of the composite optical system 40 by the first color optical system 81, the bias in the light intensity distribution of the light source device 1 formed on the exit surface 46 side of the composite optical system 40 by the second color optical system 82, and the bias in the light intensity distribution of the light source device 1 formed on the exit surface 46 side of the composite optical system 40 by the third color optical system 83 are all the same.

[0061] The operation of the first color optical system 81 will now be explained. The first blue light Lb1, emitted from the first light source device 1A, is homogenized in the first integrator optical system 51 in a plane perpendicular to the optical axis of the first integrator optical system 51, and passes through the condenser lens 8 before passing through the first color separation element 11. On the other hand, the light emitted from the second light source device 1B, is homogenized in the second integrator optical system 52 in a plane perpendicular to the optical axis of the second integrator optical system 52, and passes through the condenser lens 8 before being separated in the first color separation element 11 into second blue light Lb2 and yellow light Lgr of a different wavelength than the second blue light Lb2. The second blue light Lb2 is reflected in the XY plane by the first color separation element 11 and combined (mixed) with the first blue light Lb1 to generate first color light (blue light) Lb. For this reason, in this embodiment, the first reflection of the first color light Lb occurs in the first color separation element 11.

[0062] The condenser lens 8 and the first focusing lens 21 of the relay optical system 20 focus the first color light Lb onto the reflective surface 16A of the fourth reflective member 16. In the first color light optical system 81, a first intermediate image of the light source image is formed on the reflective surface 16A of the fourth reflective member 16. That is, the first imaging point in the first color light optical system 81 is formed on the reflective surface 16A of the fourth reflective member 16.

[0063] The first color light Lb reflected by the first color separation element 11 is incident on the fourth reflecting member 16. The first color light Lb is reflected in the XY plane by the fourth reflecting member 16. A second reflection of the first color light Lb occurs in the fourth reflecting member 16.

[0064] The first-color light Lb reflected by the fourth reflecting member 16 is incident on the first reflecting member 13. The first-color light Lb is reflected in the YZ plane by the first reflecting member 13. A third reflection of the first-color light Lb takes place in the first reflecting member 13.

[0065] The first color light Lb reflected by the first reflective member 13 passes through the first polarizer 61 and the second polarizer 62 and enters the first reflective liquid crystal panel 31. The first color light Lb is reflected in the -Z direction by the first reflective liquid crystal panel 31. A fourth reflection of the first color light Lb takes place in the first reflective liquid crystal panel 31.

[0066] Here, the second condensing lens 22 and the third condensing lens 23 of the relay optical system 20 focus the first color light Lb onto the first incident surface 31A of the first reflective liquid crystal panel 31. In the first color light optical system 81, a second intermediate image of the light source image is formed on the first reflective liquid crystal panel 31. That is, the second imaging point in the first color light optical system 81 is formed on the first incident surface 31A of the first reflective liquid crystal panel 31. The first lens array 6A and the first incident surface 31A of the first reflective liquid crystal panel 31 are optically conjugate.

[0067] The first color light Lb reflected by the first reflective liquid crystal panel 31 is incident on the second polarizer 62. The first color light Lb is reflected in the XZ plane by the second polarizer 62. The fifth reflection of the first color light Lb takes place in the second polarizer 62.

[0068] The first color light Lb reflected by the second polarizer 62 enters the incident surface 41 of the composite optical system 40. In this way, the first color light Lb is reflected five times by multiple optical components in the first color light optical system 81 before entering the composite optical system 40.

[0069] A mirror image of an object is formed by reflection from an optical component. A mirror image is an image of an object created by reflection from a plane mirror. In other words, a mirror image is an image that is reversed only horizontally or vertically, and the object and its mirror image are symmetrical in terms of plane.

[0070] Furthermore, the first color light Lb is focused twice by the relay optical system 20. That is, the first color light Lb is imaged twice in the first color light optical system 81 and then incident on the composite optical system 40. The relay optical system 20 forms an inverted image of the object. An inverted image is an image of an object formed through a convex lens or the like, and the image of the object and the inverted image are 180° rotationally symmetric with respect to the optical axis.

[0071] Next, the operation of the second color optical system 82 will be explained. Light emitted from the second light source device 1B, homogenized in the plane perpendicular to the optical axis of the second integrator optical system 52 in the second integrator optical system 52, and passed through the condenser lens 8 is separated in the first color separation element 11 into second blue light Lb2 and yellow light Lgr of a different wavelength from the second blue light Lb2. The yellow light Lgr that has passed through the first color separation element 11 is separated in the second color separation element 12 into second color light Lg and third color light Lr. The second color light Lg is reflected in the XY plane by the second color separation element 12. The first reflection of the second color light Lg takes place in the second color separation element 12.

[0072] The second-color light Lg reflected by the second-color separation element 12 is incident on the second reflecting member 14. The second-color light Lg is reflected in the XZ plane by the second reflecting member 14. A second reflection of the second-color light Lg takes place in the second reflecting member 14.

[0073] The second color light Lg reflected by the second reflective member 14 passes through the third polarizer 63 and the fourth polarizer 64 and enters the second reflective liquid crystal panel 32. The second color light Lg is reflected in the -Z direction by the second reflective liquid crystal panel 32. A third reflection of the second color light Lg takes place in the second reflective liquid crystal panel 32.

[0074] Here, the condenser lens 8 focuses the second color light Lg onto the second incident surface 32A of the second reflective liquid crystal panel 32. In the second color light optical system 82, an intermediate image of the light source image is formed on the second reflective liquid crystal panel 32. That is, the imaging point in the second color light optical system 82 is formed on the second incident surface 32A of the second reflective liquid crystal panel 32. The first lens array 6A and the second incident surface 32A of the second reflective liquid crystal panel 32 are optically conjugate.

[0075] The second-color light Lg reflected by the second-reflective liquid crystal panel 32 is incident on the fourth polarizer 64. The second-color light Lg is reflected in the YZ plane by the fourth polarizer 64. The fourth reflection of the second-color light Lg takes place in the fourth polarizer 64.

[0076] The second color light Lg reflected by the fourth polarizer 64 is incident on the incident surface 42 of the composite optical system 40.

[0077] Thus, the second-color light Lg is reflected four times by multiple optical components in the second-color light optical system 82 before entering the composite optical system 40. Furthermore, the second-color light Lg is imaged once in the second-color light optical system 82 before entering the composite optical system 40.

[0078] Next, the operation of the third-color optical system 83 will be explained. The yellow light Lgr emitted from the second light source device 1B, which is homogenized in the plane perpendicular to the optical axis of the second integrator optical system 52 in the second integrator optical system 52 and passes through the condenser lens 8 and the first color separation element 11, is separated into second-color light Lg and third-color light Lr in the second color separation element 12. The third-color light Lr passes through the second color separation element 12.

[0079] The third color light Lr that has passed through the second color separation element 12 is incident on the third reflecting member 15. The third color light Lr is reflected in the YZ plane by the third reflecting member 15. The first reflection of the third color light Lr takes place in the third reflecting member 15.

[0080] The third-color light Lr reflected by the third reflective member 15 passes through the fifth polarizer 65 and the sixth polarizer 66 and enters the third reflective liquid crystal panel 33. The third-color light Lr is reflected in the -Z direction by the third reflective liquid crystal panel 33. A second reflection of the third-color light Lr takes place in the third reflective liquid crystal panel 33.

[0081] Here, the condenser lens 8 focuses the third color light Lr onto the third incident surface 33A of the third reflective liquid crystal panel 33. In the third color light optical system 83, an intermediate image of the light source image is formed on the third reflective liquid crystal panel 33. That is, the imaging point in the third color light optical system 83 is formed on the third incident surface 33A of the third reflective liquid crystal panel 33. The first lens array 6A and the third incident surface 33A of the third reflective liquid crystal panel 33 are optically conjugate.

[0082] The third-color light Lr reflected by the third-reflective liquid crystal panel 33 is incident on the sixth polarizer 66. The third-color light Lr is reflected in the XZ plane by the sixth polarizer 66. The third reflection of the third-color light Lr takes place in the sixth polarizer 66.

[0083] The third color light Lr reflected by the sixth polarizer 66 is incident on the incident surface 43 of the composite optical system 40.

[0084] Thus, the third-color light Lr is reflected three times by multiple optical components in the third-color light optical system 83 before entering the composite optical system 40. Furthermore, the third-color light Lr is imaged once in the third-color light optical system 83 before entering the composite optical system 40.

[0085] Next, the changes in the bias of the light intensity distribution of the light source device 1 in the first-color optical system 81, the second-color optical system 82, and the third-color optical system 83 will be explained with reference to Figure 4. In the explanation using Figure 4, in order to make the bias of the light intensity distribution easier to understand, the direction (orientation) of the light source image showing the bias of the light intensity distribution will be shown corresponding to the graphic direction of the letter "F". In Figure 4, the letter "F" is schematically drawn on each optical component, but the light source image, more precisely, the image on each lens of the first lens array 6A, is formed only on the corresponding conjugate plane. In other words, the light source image is formed on the third condensing lens 23, the first reflective liquid crystal panel 31, the second reflective liquid crystal panel 32, and the third reflective liquid crystal panel 33, which are in an optically conjugate positional relationship with the first lens array 6A. In the XZ plane, the +Z direction is defined as "F" being above, and the reference direction is defined as the orientation of the light source image in which "F" can be read in the correct orientation when viewed from the direction from the light source device 1 toward the screen 70 in the optical axis direction.

[0086] The orientation of the light source image, which indicates the bias in the light intensity distribution in the first color optical system 81, will now be explained. Reflection at the first color separation element 11 forms a mirror image of the light source image. Furthermore, the action of the first condensing lens 21 of the relay optical system 20 inverts the light source image. As a result, as shown in Figure 4, the orientation of the light source image at the reflective surface 16A of the fourth reflective member 16 is rotated by 180° (inverted).

[0087] Reflection by the fourth reflective member 16 forms a mirror image of the light source image. Furthermore, the second condensing lens 22 and the third condensing lens 23 of the relay optical system 20 reverse the orientation of the light source image. As a result, as shown in Figure 4, the orientation of the light source image on the reflective surface 13A of the first reflective member 13 becomes a reference direction that is neither reversed nor rotated.

[0088] Reflection by the first reflective member 13 forms a mirror image of the light source image. As a result, as shown in Figure 4, the orientation of the light source image on the first incident surface 31A of the first reflective liquid crystal panel 31 is inverted vertically.

[0089] The reflection from the first reflective liquid crystal panel 31 forms a mirror image of the light source image. As a result, as shown in Figure 4, the orientation of the light source image on the reflective surface of the second polarizer 62 is rotated by 180° (inverted).

[0090] Reflection by the second polarizer 62 forms a mirror image of the light source. As a result, as shown in Figure 4, the orientation of the light source image at the incident surface 41 of the composite optical system 40 is inverted vertically.

[0091] Next, we will explain the orientation of the light source image, which indicates the bias in the light intensity distribution in the second color optical system 82. Reflection at the second color separation element 12 forms a mirror image of the light source image. As a result, as shown in Figure 4, the orientation of the light source image at the reflective surface 14A of the second reflective member 14 is rotated by 180° (inverted).

[0092] The reflection by the second reflective member 14 forms a mirror image of the light source image. As a result, as shown in Figure 4, the orientation of the light source image on the second incident surface 32A of the second reflective liquid crystal panel 32 is inverted vertically.

[0093] The reflection from the second reflective liquid crystal panel 32 forms a mirror image of the light source image. Furthermore, the condenser lens 8 inverts the light source image. As a result, as shown in Figure 4, the orientation of the light source image on the reflective surface of the fourth polarizer 64 is inverted vertically.

[0094] Reflection by the fourth polarizer 64 forms a mirror image of the light source image. As a result, as shown in Figure 4, the orientation of the light source image at the incident surface 42 of the composite optical system 40 becomes a reference direction that is neither inverted nor rotated.

[0095] Next, we will explain the orientation of the light source image, which indicates the bias in the light intensity distribution in the third-color optical system 83. Reflection by the third reflective member 15 forms a mirror image of the light source image. As a result, as shown in Figure 4, the orientation of the light source image on the third incident surface 33A of the third reflective liquid crystal panel 33 is inverted vertically.

[0096] The reflection from the third reflective liquid crystal panel 33 forms a mirror image of the light source image. Furthermore, the condenser lens 8 inverts the light source image. As a result, as shown in Figure 4, the orientation of the light source image at the reflective surface of the sixth polarizer 66 becomes a reference direction that is neither inverted nor rotated.

[0097] Reflection by the sixth polarizer 66 forms a mirror image of the light source image. As a result, as shown in Figure 4, the orientation of the light source image at the incident surface 43 of the composite optical system 40 is inverted vertically.

[0098] The light source image formed on the incident surface 41 and the light source image formed on the incident surface 42 are combined at the first combining surface 44 of the combining optical system 40. As shown in Figure 4, the light source image formed on the incident surface 41 and the light source image formed on the incident surface 42 coincide at the first combining surface 44 of the combining optical system 40.

[0099] The light source image formed on the incident surface 42 and the light source image formed on the incident surface 43 are combined at the second combining surface 45 of the combining optical system 40. As shown in Figure 4, the light source image formed on the incident surface 42 and the light source image formed on the incident surface 43 coincide at the second combining surface 45 of the combining optical system 40.

[0100] Therefore, the orientation of the light source image formed on the exit surface 46 side of the composite optical system 40 by the first color optical system 81, the orientation of the light source image formed on the exit surface 46 side of the composite optical system 40 by the second color optical system 82, and the orientation of the light source image formed on the exit surface 46 side of the composite optical system 40 by the third color optical system 83 are the same.

[0101] In other words, in this embodiment, as shown in Figure 4, the orientation of the light source image incident on the incident surface 41 and the orientation of the light source image incident on the incident surface 42 are mirror-symmetric with respect to the first composite surface 44, and the orientation of the light source image incident on the incident surface 42 and the orientation of the light source image incident on the incident surface 43 are mirror-symmetric with respect to the second composite surface 45. The relationship between the orientation of the light source image incident on the incident surface 41, the incident surface 42, and the incident surface 43 of this composite optical system 40 causes the orientation of the light source images of each color emitted from the composite optical system 40 to coincide.

[0102] As described above, according to this embodiment, the device comprises: a diffuser plate 3 that, when irradiated with first blue light emitted from a first solid light source 2A, diffuses and emits the first blue light in a first direction parallel to a first axis within a predetermined plane; a phosphor 53 that, when irradiated with second blue light emitted from a second solid light source 2B and having a different wavelength from the first blue light, converts a portion of the second blue light into yellow light and emits the second blue light and yellow light in a second direction parallel to a second axis perpendicular to the first axis within the predetermined plane; and a first color separation element 11 that transmits the first blue light in a first direction, reflects the second blue light in a first direction, emits a mixture of the first blue light and the second blue light in a first direction, and transmits yellow light in a second direction. With this configuration, blue light can be generated by combining (mixing) first blue light and second blue light with different wavelengths via the first color separation element 11. Therefore, the difference in wavelengths between the first and second blue light allows for adjustment of the fringe spacing and the position of peaks and valleys, thereby reducing speckle noise and fringe generation in the projected light (composite light). Furthermore, since a diffuser plate 3 is provided that diffuses and emits the first blue light in the first direction, the brightness of the blue light including the first blue light can be increased, thereby increasing the brightness of the projected light (composite light).

[0103] Furthermore, according to this embodiment, since the second blue light has a shorter wavelength than the first blue light, the second blue light and the yellow light obtained by converting a portion of the second blue light can be easily separated via the first color separation element 11, and the separated second blue light and the first blue light can be combined (mixed) to generate blue light.

[0104] Furthermore, according to this embodiment, since a second color separation element 12 is provided that separates the yellow light transmitted through the first color separation element 11 into green light and red light, it is possible to easily generate three colors of light: blue light, green light, and red light.

[0105] Furthermore, according to this embodiment, the system includes a first reflective liquid crystal panel 31, a second reflective liquid crystal panel 32, and a third reflective liquid crystal panel 33, which optically modulate the blue light, green light, and red light separated by the first color separation element 11 and the second color separation element 12 based on image data. Since the optical path lengths from the second color separation element 12 to the second reflective liquid crystal panel 32 and the third reflective liquid crystal panel 33 are the same for the green light and red light, the green light and red light separated by the second color separation element 12 can be appropriately sent to the second reflective liquid crystal panel 32 and the third reflective liquid crystal panel 33, and images can be formed on the second reflective liquid crystal panel 32 and the third reflective liquid crystal panel 33, respectively.

[0106] The configuration of the projection display device 100 according to this embodiment has been described above, but the configuration of the projection display device 100 is not limited to the embodiment described above.

[0107] The projection display device of this embodiment can be used, for example, in optical projection technology that generates composite light by combining multiple colored lights modulated by an optical modulation element and projects this composite light.

[0108] 1 Light source device 2A First solid-state light source (first light source unit) 2B Second solid-state light source (second light source unit) 3 Diffuser plate 10 Illumination optical system 11 First color separation element 12 Second color separation element 31 First reflective liquid crystal panel 32 Second reflective liquid crystal panel 33 Third reflective liquid crystal panel 40 Composite optical system 50 Projection optical system 53 Phosphor 70 Screen 100 Projection display device

Claims

1. A projection display device comprising: a diffuser plate that, when irradiated with first blue light emitted from a first light source, diffuses and emits the first blue light in a first direction parallel to a first axis within a predetermined plane; a phosphor that, when irradiated with second blue light emitted from a second light source and having a different wavelength from the first blue light, converts a portion of the second blue light into yellow light and emits the second blue light and the yellow light in a second direction parallel to a second axis perpendicular to the first axis within the predetermined plane; and a first color molecular element that transmits the first blue light in the first direction, reflects the second blue light in the first direction, emits a mixture of the first blue light and the second blue light in the first direction, and transmits the yellow light in the second direction.

2. The projection display device according to claim 1, wherein the second blue light has a shorter wavelength than the first blue light.

3. The projection display device according to claim 1, further comprising a second color separation element that separates the yellow light transmitted through the first color molecular element into green light and red light.

4. The projection display device according to claim 3, comprising a reflective liquid crystal panel that optically modulates the blue light, green light, and red light separated by the first color molecular element and the second color separation element based on image data, wherein the optical path lengths from the second color separation element to each reflective liquid crystal panel are the same for the green light and the red light.

Images