Projection type display device

Abstract

The projection-type display device includes: a plurality of light modulation devices that modulate mutually different colored lights; a color synthesis optical device that synthesizes the plurality of colored lights modulated by the plurality of light modulation devices; a polarizing plate laminated part (43) including a polarizing plate (431) disposed on the light emission side of the at least one light modulation device, a heat dissipation plate (432) laminated on the polarizing plate and transmitting light, and a fixing member (433) integrated with the polarizing plate and the heat dissipation plate therebetween; and a polarizing plate holder (44) for attaching the polarizing plate laminated part to the color combining optical device. The polarizing plate laminated portion is fixed to the polarizing plate holder by fixing the fixing member to the polarizing plate holder with an adhesive (439).

Description

TECHNICAL FIELD

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

[0002] In Patent Literature 1, a projection display device (projector) is disclosed which has a liquid crystal panel that modulates light emitted from a light source, a polarizing plate disposed on the light exit side of the liquid crystal panel, and a projection device that projects light modulated by the liquid crystal panel.

[0003] In recent years, the high luminance of the projection display device has been developed, and along with this, the polarizing plate further generates heat. In contrast, in the projection display device of Patent Literature 1, cooling of the polarizing plate is promoted by fixing the heat sink (transparent substrate) overlapping the polarizing plate. In Patent Literature 1, the polarizing plate and the heat sink are sandwiched between the support portion and the holding portion by engaging the holding portion with the support portion mounted to the color-combining optical device.

[0004] [Patent Literature]

[0005] [Patent Literature]

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2018-10181 SUMMARY

[0007] [Problems to be Solved by the Invention]

[0008] However, in the projection display device of Patent Literature 1, since the holding portion and the support portion are engaged, the structure in which the polarizing plate and the heat sink are fixed overlapping and mounted to the color-combining optical device becomes complicated.

[0009] The present application was achieved in view of the above-described circumstances, and an object thereof is to provide a projection display device capable of fixing a polarizing plate and a heat sink overlapping and mounting to a color-combining optical device with a simple structure.

[0010] [Means for Solving the Problems]

[0011] A first aspect of the present application is a projection display device characterized by comprising: a plurality of light modulation devices that modulate mutually different color lights; a color-combining optical device that combines a plurality of color lights modulated in the plurality of light modulation devices; a polarizing plate laminating portion including a polarizing plate disposed on the light exit side of at least one of the light modulation devices, a heat sink laminated to the polarizing plate and allowing light to pass therethrough, and a fixing member that sandwiches the polarizing plate and the heat sink and integrates them; and a polarizing plate holder for mounting the polarizing plate laminating portion to the color-combining optical device, the polarizing plate laminating portion being fixed to the polarizing plate holder by fixing the fixing member to the polarizing plate holder with an adhesive.

[0012] [Effects of Invention]

[0013] According to the present application, a polarizing plate and a heat sink can be fixed in superposition with a simple structure, and mounted in a color-combining optical device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a perspective view showing the appearance of a projection display device according to an embodiment of the present application, as viewed from the front side.

[0015] Figure 2 is a perspective view showing a light source device, a color-separating optical device, an electro-optical device, and a color-combining optical device possessed by the projection display device of Figure 1 .

[0016] Figure 3 is a plan view showing the light source device, the color-separating optical device, the electro-optical device, and the color-combining optical device possessed by the projection display device of Figure 1 .

[0017] Figure 4 is a perspective view showing the electro-optical device and the color-combining optical device possessed by the projection display device of Figure 1 .

[0018] Figure 5 is a plan view showing the electro-optical device and the color-combining optical device of Figure 4 , as viewed from the V direction.

[0019] Figure 6 is a view showing a region VI of Figure 5 , enlarged.

[0020] Figure 7 is a perspective view showing the color-combining optical device and one electro-optical device of Figure 4 , Figure 5 , exploded.

[0021] Figure 8 is a perspective view showing the state in which a polarizing plate layer-stacking portion, a polarizing plate holder, an optical compensating plate, and a compensating plate holder are assembled in the projection display device according to an embodiment of the present application.

[0022] Figure 9 is a plan view showing the structure of Figure 8 , as viewed from the IX direction.

[0023] Figure 10 is a perspective view showing the state in which the compensating plate holder on which the optical compensating plate is mounted is detached from the polarizing plate holder on which the polarizing plate layer-stacking portion is mounted, in Figure 8 , Figure 9 .

[0024] Figure 11 Viewed from the side of the compensating plate retainer Figure 10 A top view of the polarizing plate stack and the polarizing plate holder.

[0025] Figure 12 It is along Figure 11 A sectional view cut along line XII-XII.

[0026] Figure 13 It is an enlarged representation Figure 12 The diagram of region XIII.

[0027] Figure 14 It means in Figure 10 to Figure 12 An exploded perspective view of the polarizer plate stack being removed from the polarizer plate holder.

[0028] Figure 15 It means Figure 8 to Figure 14 A three-dimensional view of the polarizer holder.

[0029] Figure 16 Viewed from the XVI direction Figure 15 A bottom view of the polarizer holder.

[0030] Figure 17 Is Figure 14 An exploded perspective view showing the separation of the fixing component from the polarizing plate and the heat sink in the polarizing plate stack.

[0031] Figure 18 It means Figure 17 Top view of the fixed component.

[0032] Figure 19 Observing from the XIX direction Figure 18 Top view of the fixed component.

[0033] Figure 20 Viewed from the polarizer holder side Figure 8 to Figure 10 A top view of the optical compensation plate and its retainer.

[0034] Figure 21 Observing from the XXI direction Figure 20 A bottom view of the optical compensation plate and its retainer.

[0035] Figure 22 It means in Figure 20 , Figure 21 An exploded perspective view of the optical compensation plate being removed from the compensation plate holder.

[0036] Figure 23 It means Figure 22 A three-dimensional view of the compensation plate retainer. Detailed Implementation

[0037] The following is for reference Figure 1 to Figure 23 One embodiment of the present invention will be described.

[0038] Figure 1 The projection-type display device 1 (projector) shown in this embodiment is a device that projects image light (image) onto a display surface such as a screen. Figure 1 to Figure 3 As shown, the projection display device 1 includes a light source device 2, a color separation optical device 3, an electro-optical device 4, a color combining optical device 5, a projection lens 6, and a housing 7. Additionally, although not shown, the projection display device 1 includes a cooling device for cooling the electro-optical device 4, etc., and a power supply device for supplying power to the light source device 2, the electro-optical device 4, the cooling device, etc.

[0039] The light source device 2, color separation optical device 3, electro-optic device 4, color synthesis optical device 5, cooling device, and power supply device are all located inside the housing 7. Figure 1 In this case, the projection lens 6 is disposed on the outside of the housing 7, but it can also be disposed on the inside of the housing 7, for example.

[0040] Figure 2 , Figure 3 The light source device 2 shown outputs white light to the color separation optical device 3. The specific structure of the light source device 2 can be arbitrary.

[0041] Figure 2 , Figure 3 The color-separating optical device 3 shown separates the white light output from the light source device 2 into three colors: red, green, and blue. These colors are then output to three electro-optical devices 4 corresponding to their respective colors. For example... Figure 3 As shown, the color separation optical device 3 has an integrating unit 31, two dichroic mirrors 32 and 33, and three reflecting mirrors 34, 35, and 36.

[0042] In the color-separating optical device 3, white light output from the light source device 2 is passed through an integrating unit 31 to homogenize the illuminance of the white light. Red light from the white light passing through the integrating unit 31 is reflected by a first dichroic mirror 32, further reflected by a reflecting mirror 34, and then incident on an electro-optical device 4 for red light (red electro-optical device 4-R). Furthermore, green light from the white light passes through the first dichroic mirror 32, is reflected by a second dichroic mirror 33, and then incident on an electro-optical device 4 for green light (green electro-optical device 4-G). Additionally, blue light from the white light passes through the first dichroic mirror 32 and the second dichroic mirror 33, is reflected by two reflecting mirrors 35 and 36, and then incident on an electro-optical device 4 for blue light (blue electro-optical device 4-B).

[0043] Alternatively, in the color separation optical device 3, for example, blue light may be reflected by the first dichroic mirror 32, and red light may pass through the first dichroic mirror 32 and the second dichroic mirror 33.

[0044] like Figure 4 , Figure 5 As shown, each of the three electro-optic devices 4 has a liquid crystal panel 41 (light modulation device). The liquid crystal panel 41 is paired with the color separation optical device 3 (see reference). Figure 3 The incident light of different colors (red, green, and blue) is modulated.

[0045] The color-combining optical device 5 is a cross-shaped dichroic prism that combines the three colors of light modulated in the three liquid crystal panels 41. The light combined in the color-combining optical device 5 (combined light) is output to the projection lens 6 (see reference). Figure 1 ).

[0046] The projection lens 6 amplifies the synthesized light output from the color synthesizing optical device 5 and projects it onto a display surface such as a screen.

[0047] like Figure 6 , Figure 7 As shown, the color combining optical device 5 has three sets of holding parts 50 that hold three electro-optical devices 4 respectively. Each holding part 50 has two holding members 52 disposed at both ends (upper end and lower end) in the vertical direction (Z-axis direction) of the color combining optical device 5.

[0048] Each retaining member 52 is formed by bending or other processes on a sheet material (e.g., a metal sheet). Each retaining member 52 has: a substrate portion 53, on which a polarizing plate holder 44 of the electro-optic device 4 (described later) is disposed overlappingly; and a plurality of protrusions 54 for mounting the liquid crystal panel 41 to the color-combining optical device 5. The protrusions 54 protrude from the substrate portion 53 toward the liquid crystal panel 41. Figure 7 In this configuration, each retaining member 52 has two protrusions 54, which are arranged at intervals in the left-right direction, but are not limited thereto. The aforementioned "left-right direction" refers to the direction relative to the up-down direction (Z-axis direction) and the direction in which colored light is incident on the color-combining optical device 5 through the electro-optical device 4 (e.g., in...). Figure 7 The direction orthogonal to the Y-axis (e.g., in the middle) Figure 7 (The middle direction is the X-axis).

[0049] The upper holding member 52-1, located at the upper end of the color combining optical device 5, has a substrate portion 53 with multiple positioning protrusions 55 for positioning each polarizer holder 44 relative to the color combining optical device 5. The positioning protrusions 55 are provided on the surface of the substrate portion 53 that overlaps with the polarizer holder 44. Figure 7In this case, two positioning protrusions 55 are provided on the upper retaining member 52-1, but this is not a limitation. For example, three or more positioning protrusions 55 may also be provided on the upper retaining member 52-1. In addition, the positioning protrusions 55 may be provided only on the base plate portion 53 of the lower retaining member 52-2, or they may be provided on both retaining members 52.

[0050] like Figure 4 to Figure 7 As shown, the liquid crystal panel 41 is fixed to a positioning plate 42 for positioning the liquid crystal panel 41 on the color combining optical device 5 by means of threaded fastening. The positioning plate 42 overlaps with the surface of the liquid crystal panel 41 facing the color combining optical device 5.

[0051] like Figure 4 , Figure 7 As shown, the positioning plate 42 has a light-passing opening 421 and a plurality of holes 423. The light-passing opening 421 of the positioning plate 42 allows the colored light passing through the liquid crystal panel 41 to reach the color-combining optical device 5. Each hole 423 extends through the positioning plate 42. The number of holes 423 corresponds to the number of protrusions 54 on each holding portion 50 of the color-combining optical device 5. Each protrusion 54 of the holding portion 50 is inserted into each hole 423. In this state, the protrusions 54 of the holding portion 50 and the holes 423 of the positioning plate 42 are fixed using an adhesive (not shown) (e.g., UV adhesive). Thus, the liquid crystal panel 41 can be fixed to the color-combining optical device 5.

[0052] In addition to the aforementioned liquid crystal panel 41, each electro-optical device 4 also includes a polarizing plate unit 40. For example... Figure 9 , Figure 10 As shown, the polarizing plate unit 40 has a polarizing plate stack 43 and a polarizing plate holder 44.

[0053] like Figure 6 , Figure 14 , Figure 17 As shown, the polarizing plate stack 43 includes a polarizing plate 431, a heat sink 432, and a fixing member 433. The polarizing plate 431 is disposed on the light emitting side (positive Y-axis direction side) of the liquid crystal panel 41, that is, between the color combining optical device 5 and the liquid crystal panel 41 (see reference). Figure 6 The polarizing plate 431 in this embodiment has a wire grid, but is not limited thereto. A heat sink 432 is stacked on the polarizing plate 431 to allow light (colored light) to pass through. The thermal conductivity of the heat sink 432 is preferably higher than that of the polarizing plate 431. Therefore, the heat from the polarizing plate 431 can be efficiently transferred to the heat sink 432. Furthermore, the heat from the polarizing plate 431 can be efficiently diffused to the surroundings. The heat sink 432 can be, for example, a sapphire plate, a quartz plate, a quartz glass plate, etc. Figure 6In this configuration, the heat sink 432 is positioned on the light-emitting side (positive Y-axis direction side) of the polarizing plate 431, that is, between the color-combining optical device 5 and the polarizing plate 431, but is not limited thereto.

[0054] In this embodiment, the polarizing plate 431 and the heat sink 432 are formed with the same shape and the same size when viewed from their stacking direction (thickness direction; Y-axis direction). Furthermore, the polarizing plate 431 and the heat sink 432 in this embodiment are rectangular when viewed from their stacking direction.

[0055] The fixing member 433 integrates the polarizing plate 431 and the heat sink 432. In this embodiment, the fixing member 433 is formed by bending or similar processes on a sheet material (e.g., a metal sheet). Figure 17 to Figure 19 As shown, the fixing member 433 has a base portion 434, a pair of spring portions 435 and a pair of aligning portions 436.

[0056] The substrate 434 is formed in the shape of a strip plate and is disposed overlapping the first side surfaces 431S and 432S (side surfaces) of the polarizing plate 431 and the heat sink 432. In this embodiment, the first side surfaces 431S and 432S of the polarizing plate 431 and the heat sink 432 are surfaces facing in a left-right direction (X-axis direction) orthogonal to the stacking direction of the polarizing plate 431 and the heat sink 432. The shape and size of the substrate 434 correspond to the shape and size of the first side surfaces 431S and 432S (side surfaces) of the stacked polarizing plate 431 and the heat sink 432.

[0057] A pair of spring portions 435 protrude from the base portion 434 in the same direction and are capable of elastically flexing and deforming relative to the base portion 434. The pair of spring portions 435 clamp the polarizing plate 431 and the heat sink 432 in the stacking direction of the polarizing plate 431 and the heat sink 432. Specifically, the pair of spring portions 435 are located at both ends of the base portion 434 in the width direction (Y-axis direction) corresponding to the stacking direction of the polarizing plate 431 and the heat sink 432. The spacing between the pair of spring portions 435 in the width direction of the base portion 434 gradually decreases as the front end of the spring portion 435 protrudes from the base portion 434 toward the protruding direction of the spring portion 435 (especially referring to...). Figure 19 When the pair of spring portions 435 are not elastically flexed, the minimum distance between the pair of spring portions 435 is smaller than the thickness of the stacked polarizing plate 431 and heat sink 432. Therefore, when the stacked polarizing plate 431 and heat sink 432 are positioned between the pair of spring portions 435, the pair of spring portions 435 elastically flex and deform, thereby clamping the stacked polarizing plate 431 and heat sink 432 by the elastic force of the pair of spring portions 435.

[0058] In this embodiment, the distance between the front ends of a pair of spring portions 435 increases toward the front end of the spring portion 435 (see, in particular).Figure 19 The distance between the two spring portions 435 at the front end of the spring portion 435 is greater than the thickness of the stacked polarizing plate 431 and heat sink 432.

[0059] In this embodiment, a pair of spring portions 435 are respectively disposed at both ends of the base portion 434 in the longitudinal direction (Z-axis direction) corresponding to the vertical direction, but are not limited thereto (see in particular). Figure 17 , Figure 18 ).

[0060] A pair of alignment portions 436 protrude from the base portion 434 and are arranged on both sides of the polarizing plate 431 and the heat sink 432 along the first side surfaces 431S and 432S of the polarizing plate 431 and the heat sink 432 in a direction orthogonal to the stacking direction of the polarizing plate 431 and the heat sink 432.

[0061] Specifically, a pair of aligning portions 436 protrude from both ends of the base portion 434 in the long side direction (Z-axis direction) in the same direction as the spring portion 435 described above. The spacing between the pair of aligning portions 436 in the long side direction of the base portion 434 is the same as or slightly larger than the height dimension of the polarizing plate 431 and the heat sink 432 in the vertical direction (Z-axis direction). Therefore, when the base portion 434 of the fixing member 433 is overlapped with the first sides 431S and 432S of the stacked polarizing plate 431 and heat sink 432, these polarizing plates 431 and heat sink 432 are located between the pair of aligning portions 436 in the vertical direction. In this state, the gap between the polarizing plate 431 and heat sink 432 and the aligning portions 436 in the vertical direction is small.

[0062] In this embodiment, the distance between the front ends of a pair of aligning portions 436 increases toward the front end of the aligning portion 436 (especially referring to...). Figure 18 The spacing between the pair of alignment portions 436 at the front end of the alignment portion 436 is greater than the thickness of the stacked polarizing plate 431 and heat sink 432.

[0063] like Figure 14 , Figure 17 As shown, the polarizing plate stack 43 of this embodiment has two fixing members 433 as described above. The two fixing members 433 are disposed on both sides of the polarizing plate 431 and the heat sink 432 in the left-right direction, respectively clamping the polarizing plate 431 and the heat sink 432. As a result, the overlapping area of ​​the spring portion 435 of the fixing member 433 with respect to the polarizing plate 431 and the heat sink 432 in their stacking direction can be minimized, and the polarizing plate 431 and the heat sink 432 can be stably clamped by the fixing members 433.

[0064] like Figure 6As shown, the polarizing plate holder 44 is a component used to mount the aforementioned polarizing plate stack 43 onto the color-combining optical device 5. The polarizing plate stack 43 is fixed to the polarizing plate holder 44 using adhesive 439. In this embodiment, the polarizing plate holder 44 is formed by bending or similar processes on a sheet material (e.g., a metal sheet). To avoid obstructing the flow of the "cooling air" described later, the polarizing plate holder 44 is preferably made of a thin sheet material (e.g., SECC (Bond steel plate), approximately 0.5 mm thick). Figure 14 to Figure 16 As shown, the polarizer holder 44 has a holder base portion 441 and a support plate portion 442.

[0065] The holder base portion 441 is the part of the polarizing plate holder 44 that is fixed to the color combining optical device 5, and has a light-passing opening 443 for allowing colored light to pass through. The light-passing opening 443 is formed into a rectangular shape corresponding to the polarizing plate 431 and the heat sink 432. In this embodiment, the holder base portion 441 has a base plate portion 444 and a side wall plate portion 445.

[0066] Two substrate portions 444 are arranged at intervals in the vertical direction (Z-axis direction). The two substrate portions 444 constitute the edge of the light-passing opening 443 of the holder base portion 441 in the vertical direction. Each substrate portion 444 is formed as a strip extending in the horizontal direction (X-axis direction), and its thickness direction is arranged in the direction corresponding to the light transmission direction (light transmission direction; Y-axis direction). Furthermore, the light transmission direction corresponds to the stacking direction (Y-axis direction) of the stacked polarizing plate 431 and the heat sink 432.

[0067] Two sidewall panels 445 are arranged at intervals in the left-right direction. The two sidewall panels 445 form the edge of the light-passing opening 443 of the holder base portion 441 in the left-right direction. Each sidewall panel 445 is formed as a strip extending in the vertical direction and is arranged with its thickness direction facing the left-right direction. The vertical ends of each sidewall panel 445 are connected to the two base plates 444 mentioned above. Each sidewall panel 445 protrudes relative to the two base plates 444 towards the side (negative Y-axis direction side) of the polarizing plate stack portion 43 in the support plate portion 442, which will be described later.

[0068] The support plate portion 442 is disposed at the edge of the light-passing opening 443 in the holder base portion 441. The support plate portion 442 supports the polarizing plate stack portion 43 in the stacking direction (Y-axis direction) of the polarizing plate 431 and the heat sink 432. In addition, when viewed from the stacking direction of the polarizing plate 431 and the heat sink 432, the support plate portion 442 supports the peripheral portion of the polarizing plate stack portion 43.

[0069] In this embodiment, the support plate portion 442 is disposed on both sides in the left-right direction (X-axis direction) of the light-passing opening 443. Specifically, the support plate portion 442 extends inward from the two side wall plate portions 445 constituting the edge of the light-passing opening 443 in the left-right direction. Each support plate portion 442 is formed as a strip plate extending in the vertical direction, and is disposed such that its thickness direction is toward the thickness direction (Y-axis direction, stacking direction) of the substrate portion 444. However, the two ends of the support plate portion 442 in the vertical direction are located at a distance from the two substrate portions 444 arranged in the vertical direction. In addition, the support plate portion 442 is located at a position offset from the surface side (negative Y-axis direction side) of the support plate portion 442 on which the polarizing plate stack portion 43 is placed relative to the substrate portion 444 (see reference). Figure 16 The support plate portion 442 supports the two edge portions located at both ends in the left-right direction of the peripheral portion of the polarizing plate stack portion 43 (see reference). Figure 11 ).

[0070] The retainer base portion 441 has a fixing plate portion 446 that overlaps and is fixed to the color combining optical device 5. The fixing plate portion 446 is arranged such that its thickness direction is toward the thickness direction (Y-axis direction) of the substrate portion 444. Based on the substrate portion 444, the fixing plate portion 446 is located offset in the thickness direction of the substrate portion 444 towards the side opposite to the support plate portion 442 (positive Y-axis direction side). The fixing plate portion 446 is located at a position offset relative to the support plate portion 442 toward the color combining optical device 5 (see reference). Figure 6 ).

[0071] The retainer base portion 441 has a fixing plate portion 446 disposed on the top and bottom of each of the two base plate portions 444.

[0072] The upper fixing plate portion 446-1 of the two fixing plate portions 446 is connected to the first base plate portion 444-1 via a first stepped plate portion 447-1. The thickness direction of the first stepped plate portion 447-1 is oriented vertically. The lateral width of the first fixing plate portion 446-1 and the first stepped plate portion 447-1 in the left-right direction is approximately equal to the lateral width of the first base plate portion 444-1.

[0073] The first stepped plate portion 447-1 has a ventilation opening 4471 extending through its thickness direction. In the example shown, the ventilation opening 4471 extends to a portion of both the first base plate portion 444-1 and the first fixing plate portion 446-1, but is not limited thereto.

[0074] The lower fixing plate portion 446-2 of the two fixing plate portions 446 is connected to the second base plate portion 444-2 via a second stepped plate portion 447-2. The thickness direction of the second stepped plate portion 447-2 faces the vertical direction. The lateral width of the second fixing plate portion 446-2 and the second stepped plate portion 447-2 in the left-right direction is smaller than the lateral width of the second base plate portion 444-2. Additionally, as... Figure 16 As shown, when viewed from the bottom (negative Z-axis direction), the polarizer holder 44 has a second stepped plate portion 447-2 configured so that it does not overlap with a portion of the ventilation opening 4471 of the first stepped plate portion 447-1 in the vertical direction. This allows air to flow smoothly in the vertical direction between the two base plate portions 444 and the two fixing plate portions 446.

[0075] like Figure 7 As shown, the two fixing plates 446 are respectively and overlappingly fixed to the two retaining members 52 arranged above and below the color synthesis optical device 5 by means of thread fastening.

[0076] The first fixing plate portion 446-1, which overlaps with the upper retaining member 52-1, has a plurality of positioning recesses 4461 for positioning the polarizing plate holder 44 relative to the color combining optical device 5. When the first fixing plate portion 446-1 overlaps with the substrate portion 53 of the upper retaining member 52-1, a plurality of positioning protrusions 55 of the upper retaining member 52-1 are respectively inserted into the plurality of positioning recesses 4461. In this state, misalignment of the polarizing plate holder 44 relative to the color combining optical device 5 in a direction orthogonal to the thickness direction (Y-axis direction) of the substrate portion 444 can be suppressed or prevented.

[0077] In the example shown, the positioning recess 4461 extends through the first fixing plate portion 446-1, but is recessed at least from the opposing surface of the first fixing plate portion 446-1 opposite to the base plate portion 53 of the upper retaining member 52-1. The number of positioning recesses 4461 is not limited to two as shown in the example, as long as it corresponds to the number of positioning protrusions 55. In addition, the positioning recess 4461 may be provided only in the second fixing plate portion 446-2 that overlaps with the base plate portion 53 of the lower retaining member 52-2, or it may be provided in both fixing plate portions 446.

[0078] like Figure 10 to Figure 12 , Figure 14 to Figure 16As shown, the polarizer holder 44 also has a first polarizer limiting portion 448. The first polarizer limiting portion 448 is disposed adjacent to the polarizer stack portion 43 supported by the support plate portion 442 in the left-right direction (first orthogonal direction), limiting the movement of the polarizer stack portion 43 in the left-right direction. In this embodiment, the first polarizer limiting portions 448 are disposed on both sides of the polarizer stack portion 43 in the left-right direction. Specifically, the two first polarizer limiting portions 448 are formed by the two side wall plate portions 445 of the aforementioned holder base portion 441.

[0079] Furthermore, the first polarizing plate limiting portion 448 may, for example, be disposed only on one side of the polarizing plate stack portion 43 in the left-right direction.

[0080] The polarizer holder 44 also has a second polarizer limiting part 449. The second polarizer limiting part 449 is disposed adjacent to the polarizer stack 43 supported by the support plate part 442 in the vertical direction (second orthogonal direction), and restricts the movement of the polarizer stack 43 in the vertical direction.

[0081] In this embodiment, a second polarizing plate limiting portion 449 is provided on the upper side of the first substrate portion 444-1. Specifically, the second polarizing plate limiting portion 449 is formed as a plate extending from the end of the first substrate portion 444-1, which constitutes the polarizing plate holder 44, at the edge of the light passage opening 443, toward the same side as the sidewall plate portion 445 (the negative Y-axis direction side). The thickness direction of the second polarizing plate limiting portion 449 is oriented in the vertical direction.

[0082] In the example shown, two second polarizing plate limiting portions 449 are arranged at intervals in the left-right direction, but there could also be one, or even three or more. Alternatively, the second polarizing plate limiting portions 449 could be provided only on the lower second substrate portion 444-2. Alternatively, the second polarizing plate limiting portions 449 could be provided on both substrate portions 444. In this case, the upward and downward movement of the polarizing plate stack portion 43 supported by the support plate portion 442 can be restricted.

[0083] The polarizer holder 44 of this embodiment also has a plurality of positioning protrusions 450. The plurality of positioning protrusions 450 are structures for positioning the compensation plate holder 47 (described later) within the polarizer holder 44. The plurality of positioning protrusions 450 protrude toward the compensation plate holder 47.

[0084] In this embodiment, the positioning protrusions 450 of the polarizer holder 44 are provided on the side wall plate portion 445 of the holder base portion 441. The positioning protrusions 450 protrude further into the side wall plate portion 445 from the front end of the side wall plate portion 445 extending from the base plate portion 444 of the holder base portion 441 in the thickness direction (negative Y-axis direction). Two positioning protrusions 450 are provided in each of the two side wall plate portions 445. The two positioning protrusions 450 provided in each side wall plate portion 445 are located at both ends of the two side wall plate portions 445 in the vertical direction.

[0085] The polarizer holder 44 in this embodiment also has a holder support portion 451. For example... Figure 9 As shown, the retainer support 451 supports the compensation plate retainer 47 in the Y-axis direction of the arrangement of the polarizing plate 431 and the optical compensation plate 46 (described later). The retainer support 451 supports the compensation plate retainer 47 with the polarizing plate 431 and the optical compensation plate 46 spaced apart.

[0086] like Figure 15 , Figure 16 As shown, in this embodiment, a cage support portion 451 is provided on the side wall plate portion 445 of the cage base portion 441. The cage support portion 451 is formed as a plate extending inward from the front end of the side wall plate portion 445 extending from the base plate portion 444 toward the inside of the cage base portion 441 in the left-right direction. The thickness direction of the cage support portion 451 faces the thickness direction (Y-axis direction) of the base plate portion 444. Two cage support portions 451 are provided on each of the two side wall plate portions 445. The two cage support portions 451 provided on each side wall plate portion 445 are located at both ends of the two side wall plate portions 445 in the up-down direction.

[0087] like Figure 10 , Figure 12 As shown, in this embodiment, the height dimension of the sidewall plate portion 445 extending from the support plate portion 442 along the thickness direction (negative Y-axis direction) of the substrate portion 444 is larger than the thickness dimension of the polarizing plate laminate portion 43 supported on the support plate portion 442 (see reference). Figure 10 , Figure 12 Therefore, the positioning protrusion 450 and the retainer support 451 provided at the front end of the side wall plate portion 445 are located at a distance from the polarizing plate laminate portion 43 supported on the support plate portion 442 in the extending direction (negative Y-axis direction) of the side wall plate portion 445 extending from the support plate portion 442.

[0088] like Figure 10 , Figure 15As shown, in this embodiment, notches 4451 are formed on each side wall plate portion 445 of the holder base portion 441. The notches 4451 are located in the middle portion of the polarizer holder 44 in the vertical direction. The notches 4451 are formed to be recessed from the front end of the side wall plate portion 445 extending from the substrate portion 444 toward the base end side. The height dimension of the portion of the side wall plate portion 445 in which the notches 4451 are formed is less than or equal to the thickness dimension of the polarizer laminate portion 43 supported on the support plate portion 442.

[0089] like Figure 10 to Figure 12 As shown, the polarizing plate stack 43 overlaps with the support plate portion 442 of the polarizing plate holder 44. In this state, the heat sink 432 and the polarizing plate 431 are arranged sequentially from the support plate portion 442 side. Therefore, the two ends of the heat sink 432 in the left-right direction overlap with the support plate portion 442. The spring portions 435 of each fixing member 433 constituting the polarizing plate stack 43 are located on both sides of the support plate portion 442 in the vertical direction. Therefore, the spring portions 435 do not overlap with the support plate portion 442.

[0090] Furthermore, with the polarizing plate stack 43 overlapping the support plate portion 442 of the polarizing plate holder 44, the side wall plate portion 445 constituting the first polarizing plate limiting portion 448 is located on both sides of the polarizing plate stack 43 in the left-right direction. This allows the polarizing plate stack 43 to be positioned in the left-right direction.

[0091] Furthermore, in this state, by bringing the upper end of the polarizing plate stack 43 into contact with the second polarizing plate limiting portion 449, the polarizing plate stack 43 can be positioned in the vertical direction. In this embodiment, the upper ends of the polarizing plate 431 and the heat sink 432 of the polarizing plate stack 43 are in contact with the second polarizing plate limiting portion 449.

[0092] When the polarizing plate laminate 43 is positioned relative to the polarizing plate holder 44 as described above, the fixing member 433 is fixed to the polarizing plate holder 44 by adhesive 439, thereby fixing it to the polarizing plate holder 44. Specifically, as Figure 13 As shown, the spring portion 435 of the fixing member 433 is fixed to the side wall portion 445 of the polarizer holder 44 by adhesive 439.

[0093] like Figure 5 to Figure 7 As shown, each electro-optical device 4 also has an optical compensation plate 46 and a compensation plate holder 47.

[0094] like Figure 6 As shown, the optical compensation plate 46 is disposed between the liquid crystal panel 41 and the polarizing plate 431. Figure 20 , Figure 22As shown, when viewed from its thickness direction (Y-axis direction), the optical compensation plate 46 of this embodiment is formed into a rectangular shape corresponding to the polarizing plate 431 and the heat sink 432.

[0095] like Figure 8 , Figure 10 As shown, the compensation plate holder 47 is a holder for mounting the optical compensation plate 46 to the polarizing plate holder 44. Figure 20 , Figure 21 As shown, an optical compensation plate 46 is fixed to the compensation plate holder 47. Figure 20 to Figure 23 As shown, the compensation plate holder 47 of this embodiment is formed by bending a sheet material (e.g., a metal sheet). In order not to obstruct the flow of the "cooling air" described later, the compensation plate holder 47 is preferably made of a thin sheet material (e.g., SUS304 CSP, about 0.3 mm thick). The compensation plate holder 47 has a base plate portion 471 and a side wall plate portion 472.

[0096] An optical compensation plate 46 is overlapped in the thickness direction (Y-axis direction) of the base plate portion 471 of the compensation plate holder 47. The base plate portion 471 is formed in a generally flat plate shape and has a light-transmitting opening 473 for allowing colored light to pass through. The light-transmitting opening 473 is formed in a rectangular shape corresponding to the optical compensation plate 46.

[0097] The width of the opening 473 in the substrate portion 471 in the vertical direction (Z-axis direction) is equal to or slightly larger than the width of the optical compensation plate 46. Therefore, the constitutive light in the substrate portion 471 is located on both sides of the optical compensation plate 46 in the vertical direction via the upper end plate portion 474 and the lower end plate portion 475 of the upper and lower edges of the opening 473.

[0098] The lateral width of the light-transmitting opening 473 in the left-right direction (X-axis direction) of the substrate portion 471 is smaller than the lateral width of the optical compensation plate 46. Therefore, when the optical compensation plate 46 is arranged in an overlapping configuration with the substrate portion 471, the two ends of the optical compensation plate 46 in the left-right direction overlap with the two side end plates 476 of the left and right edges of the light-transmitting opening 473 in the substrate portion 471.

[0099] The side wall plate portions 472 of the compensation plate holder 47 are disposed at both ends of the base plate portion 471 in the left-right direction. Each side wall plate portion 472 is formed as a strip plate extending in the vertical direction and is arranged such that its thickness direction is oriented in the left-right direction. Each side wall plate portion 472 protrudes relative to the base plate portion 471 toward the surface side (positive Y-axis direction side) of the base plate portion 471 on which the optical compensation plate 46 is mounted.

[0100] Notches 477 are formed at both ends of the compensation plate holder 47 in the left-right direction. The notches 477 of the compensation plate holder 47 are located in the middle part of the compensation plate holder 47 in the vertical direction. The notches 477 divide each side wall plate portion 472 into two in the vertical direction. In addition, the notches 477 are formed to be recessed from both ends of the base plate portion 471 in the left-right direction.

[0101] The compensation plate holder 47 has a plurality of positioning protrusions 450 for the polarizer holder 44 (see reference). Figure 8 , Figure 10 Multiple positioning holes 478 are inserted respectively. In this embodiment, the positioning holes 478 are formed through the corners of the base plate portion 471 and the side wall plate portion 472. In addition, the positioning holes 478 are located at the two ends in the left-right direction of the base plate portion 471 and at the two ends in the up-down direction. That is, the compensation plate holder 47 in the example has four positioning holes 478.

[0102] The compensation plate holder 47 has a first compensation plate limiting portion 479. The first compensation plate limiting portion 479 is disposed adjacent to the optical compensation plate 46 in the left-right direction (first orthogonal direction) and restricts the movement of the optical compensation plate 46 in the left-right direction. In this embodiment, the first compensation plate limiting portion 479 is disposed on both sides of the optical compensation plate 46 in the left-right direction. Specifically, the two first compensation plate limiting portions 479 are located at the outer edges of the two side end plate portions 476 of the base plate portion 471 at the bottom of the notch 477 constituting the compensation plate holder 47. Like the side wall plate portion 472, the first compensation plate limiting portion 479 protrudes relative to the side end plate portion 476 on which the optical compensation plate 46 is mounted, towards the surface side (positive Y-axis direction side). The protrusion height of the first compensation plate limiting portion 479 is lower than the protrusion height of the side wall plate portion 472.

[0103] Furthermore, the first compensation plate limiting part 479 may, for example, be disposed only on one side of the optical compensation plate 46 in the left-right direction.

[0104] The compensation plate holder 47 has a second compensation plate limiting portion 480. The second compensation plate limiting portion 480 is disposed adjacent to the optical compensation plate 46 in the vertical direction (second orthogonal direction) and restricts the movement of the optical compensation plate 46 in the vertical direction. In this embodiment, the second compensation plate limiting portion 480 is disposed on both sides of the optical compensation plate 46 in the vertical direction. Specifically, the two second compensation plate limiting portions 480 are formed by the portions of the upper end plate portion 474 and the lower end plate portion 475 of the substrate portion 471, located at a position offset from other parts of the substrate portion 471 toward the side of the substrate portion 471 on which the optical compensation plate 46 is placed.

[0105] Furthermore, the second compensation plate limiting portion 480 may, for example, be disposed only on one side of the optical compensation plate 46 in the vertical direction. In addition, the second compensation plate limiting portion 480 may be formed in the same way as the second polarizing plate limiting portion 449 of the polarizing plate holder 44, that is, it may be formed as a plate that extends from the end of the upper end plate portion 474 and / or the lower end plate portion 475 of the edge of the opening 473 to the same side (positive Y-axis direction side) as the sidewall plate portion 472.

[0106] like Figure 20 , Figure 21 As shown, the optical compensation plate 46 and the two side end plates 476 of the base plate portion 471 of the compensation plate holder 47 are overlapped. That is, the two ends of the optical compensation plate 46 in the left-right direction overlap with the base plate portion 471. In this state, the first compensation plate limiting portion 479 is located on both sides of the optical compensation plate 46 in the left-right direction. As a result, the optical compensation plate 46 can be positioned in the left-right direction. In addition, the second compensation plate limiting portion 480 is located on both sides of the optical compensation plate 46 in the vertical direction. As a result, the optical compensation plate 46 can be positioned in the vertical direction.

[0107] The optical compensation plate 46 is fixed to the compensation plate holder 47 by an adhesive (not shown) in the state of being configured relative to the compensation plate holder 47 as described above.

[0108] Next, refer to Figure 8 to Figure 10 The installation of the compensation plate holder 47 relative to the polarizing plate holder 44 will be explained.

[0109] When installing the compensation plate holder 47, on which the optical compensation plate 46 is mounted, onto the polarizing plate holder 44, on which the polarizing plate stack 43 is mounted, first, the surface of the compensation plate holder 47 where the polarizing plate stack 43 is disposed is aligned with the surface of the compensation plate holder 47 where the optical compensation plate 46 is disposed. In this state, the four positioning protrusions 450 of the polarizing plate holder 44 are respectively inserted into the four positioning holes 478 of the compensation plate holder 47. This suppresses or prevents misalignment of the compensation plate holder 47 relative to the polarizing plate holder 44 in directions orthogonal to the direction (Y-axis direction) in which the polarizing plates 431 and the optical compensation plate 46 are arranged, namely, in the left-right and up-down directions.

[0110] Furthermore, in the arrangement direction (Y-axis direction) of the polarizing plate stack 43 and the optical compensation plate 46, the compensation plate holder 47 is supported by the holder support portion 451 of the polarizing plate holder 44. Specifically, the holder support portion 451 supports the surface of the substrate portion 471 of the compensation plate holder 47 on which the optical compensation plate 46 is mounted. Here, the holder support portion 451 is located away from the polarizing plate stack 43 in the aforementioned arrangement direction. Therefore, a gap (first gap G1) is formed between the polarizing plate stack 43 and the optical compensation plate 46. This first gap G1 has openings at the top and bottom of the polarizing plate holder 44 and the compensation plate holder 47.

[0111] Furthermore, as described above, when the compensation plate holder 47 and the polarizing plate holder 44 are overlapped, the two side wall portions 472 of the compensation plate holder 47 are arranged to overlap the outer sides of the two side wall portions 445 of the polarizing plate holder 44 in the left-right direction. In this state, through the cutouts 4451 formed on the two side wall portions 445 of the polarizing plate holder 44 and the cutouts 477 formed on the two side wall portions 472 of the compensation plate holder 47, side openings 401 are formed, which open the first gap G1 between the aforementioned polarizing plate stack 43 and the optical compensation plate 46 to both sides in the left-right direction (lateral direction).

[0112] The compensation plate holder 47 is fixed to the polarizer holder 44 by an adhesive (not shown) while it is installed in the polarizer holder 44 as described above. In this embodiment, the positioning protrusion 450 of the polarizer holder 44 is fixed to the periphery of the positioning hole 478 in the compensation plate holder 47 through which the positioning protrusion 450 is inserted by adhesive.

[0113] Thus, a polarizing plate unit 40 is formed in which a compensation plate holder 47, on which an optical compensation plate 46 is mounted, is assembled into a polarizing plate holder 44, on which a polarizing plate stack 43 is mounted.

[0114] Next, refer to Figure 6 , Figure 7 The installation of the polarizing plate unit 40 relative to the color combining optical device 5 will be described.

[0115] When mounting the polarizing plate unit 40 onto the color combining optical device 5, firstly, the two fixing plate portions 446 of the polarizing plate holder 44 are overlapped with the two retaining members 52 disposed above and below the color combining optical device 5. At this time, the plurality of positioning protrusions 55 of the upper retaining member 52-1 are inserted into the plurality of positioning recesses 4461 of the first fixing plate portion 446-1. As a result, the polarizing plate unit 40 is positioned relative to the color combining optical device 5 in a direction orthogonal to the direction of overlap (Y-axis direction) of the color combining optical device 5 and the polarizing plate unit 40 (i.e., the left-right direction and the up-down direction).

[0116] Furthermore, the two fixing plates 446 of the polarizing plate holder 44 are respectively fixed to the two holding members 52 of the color combining optical device 5 by thread fastening, thereby fixing the polarizing plate unit 40 to the color combining optical device 5.

[0117] In this state, since the fixing plate portion 446 of the polarizer holder 44 is located at a position offset relative to the support plate portion 442 towards the color combining optical device 5 (positive Y-axis direction), a gap (second gap G2) is formed between the polarizer stack portion 43 and the color combining optical device 5. Since the first stepped plate portion 447-1 of the polarizer holder 44 has a ventilation opening 4471 and the second stepped plate portion 447-2 has a lateral width smaller than the lateral width of the substrate portion 444, the second gap G2 is formed at the upper and lower openings of the polarizer unit 40.

[0118] Furthermore, the support plate portion 442 of the polarizer holder 44 supporting the polarizer plate stack 43 is located at a position offset relative to the substrate portion 444 of the polarizer holder 44 in the thickness direction (negative Y-axis direction) of the substrate portion 444, thereby forming a gap (third gap G3) between the polarizer plate stack 43 and the substrate portion 444 (see reference). Figure 9 , Figure 12 The third gap G3 has openings at the top and bottom of the polarizing plate unit 40. Additionally, the third gap G3 allows light to pass through the holder base portion 441 via the opening 443 (see reference). Figure 14 It is connected to the aforementioned second gap G2.

[0119] like Figure 4 , Figure 6 , Figure 7 As shown, after the polarizing plate unit 40 is mounted on the color combining optical device 5 as described above, the liquid crystal panel 41 is mounted on the color combining optical device 5. Specifically, the plurality of protrusions 54 of the holding portion 50 of the color combining optical device 5 are passed through the plurality of holes 423 of the positioning plate 42 fixed to the liquid crystal panel 41 and fixed with adhesive, thereby mounting the liquid crystal panel 41 on the color combining optical device 5. As a result, the liquid crystal panel 41 is positioned relative to the color combining optical device 5 in a direction orthogonal to the direction in which the color combining optical device 5 and the liquid crystal panel 41 are arranged (Y-axis direction) (i.e., the left-right direction and the up-down direction).

[0120] Here, the multiple protrusions 54 of the color-combining optical device 5 are located further away from the color-combining optical device 5 than the polarizing plate unit 40 mounted on the color-combining optical device 5. Therefore, a gap (fourth gap G4) is formed between the polarizing plate unit 40 (specifically the optical compensation plate 46) fixed to the color-combining optical device 5 and the liquid crystal panel 41. This fourth gap G4 opens at the top, bottom, left, and right sides of the liquid crystal panel 41.

[0121] The mounting structure of the polarizing plate unit 40 and the liquid crystal panel 41 relative to the color combining optical device 5 is the same among the three electro-optical devices 4.

[0122] In the projection-type display device 1 of this embodiment, air (cooling air) blown by a cooling device (not shown) flows from the bottom to the top (positive Z-axis direction) in three electro-optical devices 4. In each electro-optical device 4, the cooling air flows upward (positive Z-axis direction) through the first gap G1, the second gap G2, the third gap G3, and the fourth gap G4, which have openings at the top and bottom. That is, the cooling air can flow efficiently through the first to fourth gaps G1 to G4. In addition, the first gap G1 and the fourth gap G4 also open to the left and right through side openings 401, etc., so the cooling air can also flow into the first gap G1 and the fourth gap G4 from the left and right respectively. As a result, the cooling air can flow more efficiently in the first gap G1 and the fourth gap G4. Figure 8 The figure shows an example of the flow of cooling air through the first gap G1, indicated by reference numerals F1 and F2.

[0123] Furthermore, the aforementioned first gap G1 and second gap G2 are located on both sides of the polarizing plate 431 and the heat sink 432 in the polarizing plate stack 43. Therefore, the polarizing plate 431 and the heat sink 432 can be efficiently cooled using the aforementioned cooling air.

[0124] Furthermore, the first gap G1 and the fourth gap G4 are located on both sides of the optical compensation plate 46. This allows the optical compensation plate 46 to be efficiently cooled using the aforementioned cooling air.

[0125] Furthermore, since the liquid crystal panel 41 is located away from the polarizer unit 40 through the fourth gap G4, the aforementioned cooling airflow can be directed to the periphery of the liquid crystal panel 41. As a result, the liquid crystal panel 41 can be cooled efficiently.

[0126] In the projection display device 1 of this embodiment, the polarizing plate stack 43 is fixed to the polarizing plate holder 44 by an adhesive 439. Therefore, without the need for a complex structure for engaging the polarizing plate stack 43 with the polarizing plate holder 44, the polarizing plate stack 43 can be fixed to the polarizing plate holder 44. As a result, the polarizing plate 431 and the heat sink 432 can be fixed together with a simple structure, and the polarizing plate 431 and the heat sink 432, which are integrally fixed by the fixing member 433, can be mounted on the color combining optical device 5 via the polarizing plate holder 44.

[0127] Furthermore, in the projection-type display device 1 of this embodiment, the fixing member 433 of the polarizing plate stack 43 is bonded to the polarizing plate holder 44, so the adhesive 439 will not come into contact with the polarizing plate 431. Therefore, even without limiting the type of adhesive 439, it is possible to prevent the optical performance (especially the light transmission performance) of the polarizing plate 431 from deteriorating by means of the adhesive 439. This point will be explained below.

[0128] For example, depending on the type of adhesive 439, when the adhesive 439 before curing comes into contact with the polarizing plate 431, the adhesive 439 wets and spreads on the surface of the polarizing plate 431. Especially in polarizing plates 431 with wire grids, the adhesive 439 easily wets and spreads along the wire grids of the polarizing plate 431 due to capillary action. Therefore, if an adhesive that is difficult to wet and spread is not selected, the optical performance of the polarizing plate 431 will be reduced.

[0129] In contrast, in the projection-type display device 1 of this embodiment, the fixing member 433 of the polarizing plate stack 43 is bonded to the polarizing plate holder 44. Furthermore, adhesive 439 is applied to the spring portion 435 located away from the surface of the polarizing plate 431. Therefore, even if an adhesive that is difficult to wet and spread is not selected, contact between the adhesive 439 and the polarizing plate 431 can be prevented.

[0130] Furthermore, in the projection-type display device 1 of this embodiment, the fixing member 433, which integrates the polarizing plate 431 and the heat sink 432, has a pair of spring portions 435 that can elastically flex and deform to clamp the polarizing plate 431 and the heat sink 432. Through these spring portions 435, the polarizing plate 431 and the heat sink 432 can be reliably fixed in a state where they overlap in their stacking direction.

[0131] Furthermore, in the projection-type display device 1 of this embodiment, the distance between the front ends of the pair of spring portions 435 in the protruding direction increases as they approach the front end of the spring portion 435. Therefore, the polarizing plate 431 and the heat sink 432 can be smoothly inserted between the pair of spring portions 435 from the front end of the spring portion 435. As a result, damage to the polarizing plate 431 and the heat sink 432 by the pair of spring portions 435 can be suppressed or prevented.

[0132] Furthermore, in the projection-type display device 1 of this embodiment, the fixing member 433 has a pair of alignment portions 436 disposed on both sides of the polarizing plate 431 and the heat sink 432 in a vertical direction (second orthogonal direction) orthogonal to the stacking direction of the polarizing plate 431 and the heat sink 432. Thus, the pair of alignment portions 436 can suppress or prevent misalignment of the polarizing plate 431 and the heat sink 432 relative to the fixing member 433 in the vertical direction. Additionally, the pair of alignment portions 436 can also suppress relative misalignment between the polarizing plate 431 and the heat sink 432 in the vertical direction.

[0133] Furthermore, in the projection-type display device 1 of this embodiment, the distance between the front ends of the pair of alignment portions 436 in the protruding direction increases as they approach the front end of the alignment portion 436. Therefore, the polarizing plate 431 and the heat sink 432 can be smoothly inserted between the pair of alignment portions 436. As a result, damage to the polarizing plate 431 and the heat sink 432 by the pair of alignment portions 436 can be suppressed or prevented.

[0134] Furthermore, in the projection-type display device 1 of this embodiment, the support plate portion 442 of the polarizer holder 44 supports the polarizer stack portion 43 from the stacking direction of the polarizer 431 and the heat sink 432, thereby positioning the polarizer stack portion 43 relative to the polarizer holder 44 in the direction in which colored light passes through the polarizer 431 and the heat sink 432. In addition, the support plate portion 442 supports the peripheral portion of the polarizer stack portion 43, thus ensuring a large area for colored light to pass through the polarizer 431 and the heat sink 432.

[0135] Furthermore, in the projection-type display device 1 of this embodiment, the fixing plate portion 446 of the polarizing plate holder 44, which is fixed to the color-combining optical device 5 (holding member 52) in an overlapping manner, is located at a position offset towards the color-combining optical device 5 relative to the support plate portion 442 supporting the polarizing plate stack portion 43. This allows gaps (second gap G2, third gap G3) to be formed between the color-combining optical device 5 and the polarizing plate stack portion 43. By allowing cooling air to flow through these gaps (second gap G2, third gap G3), the polarizing plate 431 and the heat sink 432 can be cooled efficiently.

[0136] Furthermore, in the projection display device 1 of this embodiment, the polarizer holder 44 has a first polarizer limiting portion 448. This first polarizer limiting portion 448 is disposed adjacent to the polarizer stacked portion 43 in a left-right direction (first orthogonal direction) orthogonal to the stacking direction of the polarizer 431 and the heat sink 432, and restricts its left-right movement relative to the polarizer holder 44. Therefore, it is possible to suppress or prevent the polarizer stacked portion 43 from misaligning with the polarizer holder 44 in the left-right direction. As a result, the polarizer stacked portion 43 can be easily fixed to the polarizer holder 44 by adhesive while the polarizer stacked portion 43 is positioned in the left-right direction.

[0137] Furthermore, in the projection-type display device 1 of this embodiment, the first polarizing plate limiting portion 448 is disposed on both sides of the polarizing plate stack portion 43 in the left-right direction. This allows for more effective suppression or prevention of misalignment of the polarizing plate stack portion 43 relative to the polarizing plate holder 44 in the left-right direction.

[0138] Furthermore, in the projection display device 1 of this embodiment, the polarizer holder 44 has a second polarizer limiting portion 449, which is disposed adjacent to the polarizer stack portion 43 in the vertical direction (second orthogonal direction) and restricts the vertical movement of the polarizer stack portion 43 relative to the polarizer holder 44. Therefore, it is possible to suppress or prevent misalignment of the polarizer stack portion 43 relative to the polarizer holder 44 in the vertical direction. Thus, when the polarizer stack portion 43 is positioned relative to the polarizer holder 44 in the vertical direction, it is possible to easily fix the polarizer stack portion 43 to the polarizer holder 44 by adhesive.

[0139] Furthermore, in the projection-type display device 1 of this embodiment, the color-combining optical device 5 has a plurality of positioning protrusions 55, and the fixing plate portion 446 of the polarizing plate holder 44, which is fixed to the color-combining optical device 5 (holding member 52) in an overlapping manner, has a plurality of positioning recesses 4461 for inserting the plurality of positioning protrusions 55 into the color-combining optical device 5. By inserting the plurality of positioning protrusions 55 of the color-combining optical device 5 into the plurality of positioning recesses 4461 of the fixing plate portion 446 of the polarizing plate holder 44, the polarizing plate holder 44 can be easily mounted on the color-combining optical device 5 in a position relative to the color-combining optical device 5.

[0140] Furthermore, in the projection-type display device 1 of this embodiment, the polarizing plate holder 44, on which the polarizing plate stack 43 is mounted, has a plurality of positioning protrusions 450 protruding toward the compensation plate holder 47. Additionally, the compensation plate holder 47, on which the optical compensation plate 46 is mounted, has a plurality of positioning holes 478 into which the plurality of positioning protrusions 450 are respectively inserted. Thus, the compensation plate holder 47 can be easily positioned relative to the polarizing plate holder 44, that is, the optical compensation plate 46 can be easily positioned relative to the polarizing plate stack 43 (particularly the polarizing plate 431).

[0141] Furthermore, in the projection-type display device 1 of this embodiment, the polarizing plate holder 44 has a holder support portion 451, which supports the compensation plate holder 47 in the arrangement direction of the polarizing plate 431 and the optical compensation plate 46. Moreover, with the compensation plate holder 47 supported by the holder support portion 451, the polarizing plate 431 and the optical compensation plate 46 are located at a distance from each other in the aforementioned arrangement direction; that is, a gap (first gap G1) is formed between the polarizing plate 431 and the optical compensation plate 46. Therefore, by allowing cooling air to flow through this first gap G1, the polarizing plate 431 and the optical compensation plate 46 can be cooled efficiently.

[0142] Furthermore, in the projection display device 1 of this embodiment, the compensation plate holder 47 has a first compensation plate limiting portion 479. This first compensation plate limiting portion 479 is disposed adjacent to the optical compensation plate 46 in a left-right direction (first orthogonal direction) orthogonal to the thickness direction of the optical compensation plate 46, and restricts the movement of the optical compensation plate 46 in the left-right direction. Therefore, it is possible to effectively suppress or prevent the optical compensation plate 46 from being misaligned relative to the compensation plate holder 47 in the left-right direction. As a result, the optical compensation plate 46 can be easily fixed to the compensation plate holder 47 by adhesive bonding.

[0143] Furthermore, in the projection display device 1 of this embodiment, the compensation plate holder 47 has a second compensation plate limiting portion 480. This second compensation plate limiting portion 480 is disposed adjacent to the optical compensation plate 46 in a vertical direction (second orthogonal direction) orthogonal to the thickness direction of the optical compensation plate 46, and restricts its movement in the vertical direction. Therefore, it is possible to suppress or prevent the optical compensation plate 46 from being misaligned relative to the compensation plate holder 47 in the vertical direction. As a result, when the optical compensation plate 46 is positioned relative to the compensation plate holder 47 in the vertical direction, the optical compensation plate 46 can be easily fixed to the compensation plate holder 47 by adhesive bonding.

[0144] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments and can be appropriately modified without departing from its spirit.

[0145] In the projection-type display device of the present invention, the polarizing plate stack 43, which integrates the polarizing plate 431 and the heat sink 432 by overlapping and fixing member 433, may, for example, only have one or two of the three electro-optic devices 4. That is, the structure in which the fixing member 433 is fixed to the polarizing plate holder 44 by adhesive 439, thereby fixing the polarizing plate stack 43 to the polarizing plate holder 44, only needs to have at least one electro-optic device 4.

[0146] [Explanation of reference numerals in the attached figures]

[0147] 1 Projection type display device

[0148] 4. Electro-optical device

[0149] 5-color synthesizing optical device

[0150] 40 polarizing plate units

[0151] 41. Liquid crystal panel (light modulation device)

[0152] 43 Polarizing plate stack

[0153] 44 Polarizing plate holder

[0154] 46 Optical compensation plate

[0155] 47 Compensation plate retainer

[0156] 55 Positioning convex part

[0157] 431 polarizing plate

[0158] 431S First side view (side view)

[0159] 432 heat sink

[0160] 432S First side view (side view)

[0161] 433 Fixed components

[0162] 434 Base part

[0163] 435 Spring section

[0164] 436 Opposing part

[0165] 439 Adhesive

[0166] 441 Cage base

[0167] 442 Support plate section

[0168] 443 Light passes through the opening

[0169] 446 Fixed plate section

[0170] 448 First polarizing plate limiting section

[0171] 449 Second polarizer limiting section

[0172] 450 positioning protrusion

[0173] 451 Cage Support

[0174] 478 positioning hole

[0175] 479 First Compensation Plate Limiting Section

[0176] 480 Second Compensation Plate Limiting Section

[0177] 4461 Positioning recess

Claims

1. A projection display device characterized by comprising: a plurality of light modulation devices that modulate mutually different color lights; a color-combining optical device that combines the plurality of color lights modulated in the plurality of light modulation devices; a polarizing plate laminating portion including a polarizing plate disposed on a light exit side of at least one of the light modulation devices, a heat sink laminated to the polarizing plate and allowing light to pass therethrough, and a fixing member that sandwiches the polarizing plate and the heat sink and is integrated therewith; and a polarizing plate holder for mounting the polarizing plate laminating portion to the color-combining optical device, the polarizing plate laminating portion is fixed to the polarizing plate holder by fixing the fixing member to the polarizing plate holder with an adhesive, the fixing member has: a base portion disposed so as to overlap with side surfaces of the laminated polarizing plate and heat sink; and a pair of spring portions protruding from the base portion and elastically deformable with respect to the base portion, sandwiching the polarizing plate and the heat sink in a laminating direction of the polarizing plate and the heat sink.

2. The projection display device according to claim 1, wherein front end portions of the protruding directions of the pair of spring portions are spaced apart from each other so as to become larger toward front ends of the spring portions.

3. The projection display device according to claim 1, wherein the fixing member has: a base portion disposed so as to overlap with side surfaces of the laminated polarizing plate and heat sink; and a pair of alignment portions protruding from the base portion and disposed on both sides of the polarizing plate and the heat sink in a direction orthogonal to the laminating direction of the polarizing plate and the heat sink along the side surfaces.

4. The projection display device according to claim 3, wherein front end portions of the protruding directions of the pair of alignment portions are spaced apart from each other so as to become larger toward front ends of the alignment portions.

5. The projection display device according to claim 1, wherein the polarizing plate holder has: a holder base portion having a light passing opening through which the color light passes, fixed to the color-combining optical device; and a support plate portion provided to an edge of the light passing opening, supporting the polarizing plate laminating portion from a laminating direction of the polarizing plate and the heat sink, the support plate portion supports a peripheral edge portion of the polarizing plate laminating portion when viewed from the laminating direction.

6. The projection display device according to claim 5, wherein the holder base portion has a fixing plate portion fixed to the color-combining optical device so as to overlap, the fixing plate portion is located at a position offset to the color-combining optical device side with respect to the support plate portion in the laminating direction.

7. The projection display device according to claim 1, wherein the polarizing plate holder has a first polarizing plate restricting portion disposed adjacent to the polarizing plate laminating portion in a first orthogonal direction orthogonal to a laminating direction of the polarizing plate and the heat sink, restricting movement of the polarizing plate laminating portion to the first orthogonal direction.

8. The projection display device according to claim 7, wherein ​ The first polarizing plate restriction portion is disposed on both sides in the first orthogonal direction of the polarizing plate lamination portion.

9. The projection display apparatus according to claim 1, wherein The polarizing plate holder has a second polarizing plate restriction portion disposed adjacent to the polarizing plate lamination portion in a second orthogonal direction orthogonal to a lamination direction of the polarizing plate and the heat sink, and restricts movement of the polarizing plate lamination portion in the second orthogonal direction.

10. The projection display apparatus according to claim 1, wherein The polarizing plate holder has a fixing plate portion which is fixed to the color-combining optical device in an overlapping manner, The color-combining optical device has a plurality of positioning protrusions provided on a surface of the color-combining optical device overlapping with the fixing plate portion, The fixing plate portion has a plurality of positioning recesses into which the plurality of positioning protrusions are respectively inserted in a state where the fixing plate portion overlaps with the color-combining optical device.

11. The projection display apparatus according to claim 1, wherein The projection display apparatus comprises: an optical compensation plate disposed between the light modulation device and the polarizing plate; and a compensation plate holder which fixes the optical compensation plate and is used to mount the optical compensation plate to the polarizing plate holder, The polarizing plate holder has a plurality of positioning protrusions which protrude toward the compensation plate holder, The compensation plate holder has a plurality of positioning holes into which the plurality of positioning protrusions are respectively inserted.

12. The projection display apparatus according to claim 11, wherein The polarizing plate holder has a holder support portion which supports the compensation plate holder in an arrangement direction of the polarizing plate and the optical compensation plate, In a state where the compensation plate holder is supported by the holder support portion, the polarizing plate and the optical compensation plate are disposed at intervals in the arrangement direction.

13. The projection display apparatus according to claim 11, wherein The compensation plate holder has a first compensation plate restriction portion disposed adjacent to the optical compensation plate in a first orthogonal direction orthogonal to a plate thickness direction of the optical compensation plate, and restricts movement of the optical compensation plate in the first orthogonal direction.

14. The projection display apparatus according to claim 11, wherein The compensation plate holder has a second compensation plate restriction portion disposed adjacent to the optical compensation plate in a second orthogonal direction orthogonal to the plate thickness direction of the optical compensation plate, and restricts movement of the optical compensation plate in the second orthogonal direction.

Images