Projection device

Abstract

To provide a projection device capable of suppressing the occurrence of stray light.SOLUTION: A projection device includes: a first dichroic mirror that transmits light of a first wavelength and reflects light of a second wavelength; a second dichroic mirror that transmits the light of the first wavelength and reflects light of a third wavelength; a first self-luminous display device that uses the light of the first wavelength to emit first image light toward the first dichroic mirror and the second dichroic mirror; a second self-luminous display device that uses the light of the second wavelength to emit second image light toward the first dichroic mirror; a third self-luminous display device that has a plurality of third light-emitting elements emitting the light of the third wavelength and uses the light of the third wavelength to emit third image light toward the second dichroic mirror; and a projection optical system that projects image light obtained by being combined by the first dichroic mirror and the second dichroic mirror onto a projection target.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] A display device that synthesizes light emitted from three organic electroluminescence panels with a dichroic prism and projects it onto a screen or the like by a projection optical system is described in Patent Document 1. Each organic electroluminescence panel is a light-emitting panel provided with an organic electroluminescence element and is a self-emitting display device. The dichroic prism has a rectangular parallelepiped shape having a first incident surface, a second incident surface, a third incident surface, and an exit surface, and it is suggested that it has these side surfaces, a ceiling surface, and a bottom surface. The three self-emitting display devices are a first self-emitting display device facing the first incident surface which is the back surface of the dichroic prism, a second self-emitting display device facing the second incident surface which is one side surface of the dichroic prism, and a third self-emitting display device facing the third incident surface which is the other side surface of the dichroic prism. The light emitted from each self-emitting display device is overlapped by passing through the dichroic prism and is emitted from the exit surface which is the front surface of the dichroic prism.

[0003] Patent Document 2 describes that a display panel having pixel light sources arranged in an array has a rather wide divergence angle, although the divergence angle is reduced by a microlens.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] Light emitted from each light-emitting display device diffuses as it passes through the dichroic prism, and some of it is reflected by the top, bottom, or sides before reaching the exit surface of the dichroic prism. This light becomes stray light after it has been emitted from the exit surface of the dichroic prism. [Means for solving the problem]

[0006] To solve the above problems, the projection device of the present invention includes a first dichroic mirror that transmits light of a first wavelength and reflects light of a second wavelength, a second dichroic mirror that transmits light of the first wavelength and reflects light of a third wavelength, a first self-emissive display device having a plurality of first light-emitting elements that emit light of the first wavelength and emits first image light toward the first and second dichroic mirrors using the light of the first wavelength, and a second self-emissive display device having a plurality of second light-emitting elements that emit light of the second wavelength and emits second image light toward the first dichroic mirror using the light of the second wavelength. The present invention is characterized by comprising: a display device; a third self-emissive display device having a plurality of third light-emitting elements that emit light of the third wavelength, and emitting a third image light toward the second dichroic mirror using light of the third wavelength; a projection optical system that projects the image light combined by the first dichroic mirror and the second dichroic mirror onto a projection target; a control unit that controls the first self-emissive display device, the second self-emissive display device, and the third self-emissive display device; and a power supply unit that supplies power to the first self-emissive display device, the second self-emissive display device, the third self-emissive display device, and the control unit. [Brief explanation of the drawing]

[0007] [Figure 1] This is a schematic diagram of the image forming unit of Embodiment 1. [Figure 2] This is a schematic diagram of a self-illuminating display device viewed from the front. [Figure 3] This is a schematic diagram of a self-illuminating display device viewed from the side. [Figure 4] This is a schematic diagram of an example of a projection system including a projection device. [Figure 5] This is a schematic diagram of another example of a projection system, including a projection device. [Figure 6] This is a schematic vertical cross-section of yet another example of a projection system including a projection device. [Figure 7] This is a schematic horizontal cross-sectional view of the projection system corresponding to Figure 6. [Figure 8] This is an explanatory diagram of the projection device according to Embodiment 2. [Figure 9] This is an explanatory diagram of the projection device according to Embodiment 3. [Figure 10] This is an explanatory diagram of the projection device according to Embodiment 4. [Figure 11] This is an explanatory diagram of the angle limiting filter. [Figure 12] This figure shows another example of an angle limiting filter. [Figure 13] This is an explanatory diagram showing a self-illuminating display device with an in-plane angular distribution, viewed from the front. [Figure 14] This is a side view diagram of a self-illuminating display device with an in-plane angular distribution. [Figure 15] This is a schematic diagram of a projection device in which the self-emissive display device has a light intensity distribution. [Figure 16] This is an explanatory diagram of a self-illuminating display device that has a light emission intensity distribution. [Figure 17] This is an explanatory diagram of a first arrangement example where the first dichroic mirror and the second dichroic mirror are separated in the X-axis direction. [Figure 18] This is an explanatory diagram of a second arrangement example where the first dichroic mirror and the second dichroic mirror are separated in the X-axis direction. [Modes for carrying out the invention]

[0008] A projection device according to an embodiment of the present invention will be described below with reference to the drawings.

[0009] [Embodiment 1] FIG. 1 is a schematic view of a main part of the projection device according to Embodiment 1. As shown in FIG. 1, the projection device 1A includes an image forming unit 2 that emits image light L, a control unit 4 that controls the image forming unit 2, a projection optical system 3 that enlarges the image light L and projects it onto a screen S, which is a projection target, to form an image, and a power supply unit 5. Each unit is housed or installed in a housing 8. The power supply unit 5 can use a battery or the like, and the image forming unit 2 does not require a separate light source and is separable from the other units. With these configurations, a projection system capable of visually recognizing a high-quality image with high brightness, small size, and light weight can be realized.

[0010] The image forming unit 2 includes a first self-emitting display device 11, a second self-emitting display device 12, and a third self-emitting display device 13. In this example, each self-emitting display device is a display panel having light-emitting elements for each pixel. The light-emitting element is an OLED (Organic Light-Emitting Diode). Each self-emitting display device can also be a μLED. The self-emitting display devices are the same member. Further, the image forming unit 2 includes a first dichroic mirror 40 and a second dichroic mirror 50 for synthesizing a first image light LG having a first wavelength emitted from the first self-emitting display device 11, a second image light LB having a second wavelength emitted from the second self-emitting display device 12, and a third image light LR having a third wavelength emitted from the third self-emitting display device 13.

[0011] The control unit 4 includes an image processing unit 6 into which an image signal such as a video signal is input, and a display driving unit 7 that drives and controls a first self-emitting display device 11, a second self-emitting display device 12, and a third self-emitting display device 13 based on the image signal output from the image processing unit 6. The image processing unit 6 converts the input image signal into an image signal including color adjustment for each color. The display driving unit 7 operates the first self-emitting display device 11, the second self-emitting display device 12, and the third self-emitting display device 13 based on the image signals of each color output from the image processing unit 6. When the first dichroic mirror 40 and the second dichroic mirror 50 synthesize the first image light LG, the second image light LB, and the third image light LR, image light L corresponding to the image signal is formed. In this example, the first image light LG is green. The second image light LB is blue. The third image light LR is red. The first self-emitting display device 21, the second self-emitting display device 22, and the third self-emitting display device 23 emit image light of green, blue, and red, respectively.

[0012] The first dichroic mirror 40 and the second dichroic mirror 50 are arranged to intersect. The angle at which the first dichroic mirror 40 and the second dichroic mirror 50 intersect each other is 90°. Each self-emitting display device surrounds the first dichroic mirror 40 and the second dichroic mirror 50 from three directions. The projection optical system 3 is located on the opposite side of the first self-emitting display device 11 with the first dichroic mirror 40 and the second dichroic mirror 50 interposed therebetween.

[0013] In the following explanation, the three mutually orthogonal directions will be referred to as the X-axis direction, Y-axis direction, and Z-axis direction, respectively. Figure 1 shows the image forming unit 2 as viewed from the Z-axis direction. The X-axis direction is the direction in which the first self-emissive display device 11, the first dichroic mirror 40, the second dichroic mirror 50, and the projection optical system 3 are arranged. The Y-direction is the direction in which the second self-emissive display device 12, the first dichroic mirror 40, the second dichroic mirror 50, and the third self-emissive display device 13 are arranged. In the X-axis direction, with respect to the first dichroic mirror 40 and the second dichroic mirror 50, the side where the first self-emissive display device 11 is located is the X1 direction, and the side where the projection optical system 3 is located is the X2 direction. In the Y-axis direction, with respect to the first dichroic mirror 40 and the second dichroic mirror 50, the side where the second self-emissive display device 12 is located is the Y2 direction, and the side where the third self-emissive display device 13 is located is the Y1 direction. The first dichroic mirror 40 is tilted from the X1 direction to the Y2 direction. The second dichroic mirror 50 is tilted from the X1 direction to the Y1 direction.

[0014] The first self-emissive display device 11 emits a first image light LG toward the first dichroic mirror 40 and the second dichroic mirror 50 along the X2 direction. The second self-emissive display device 12 emits a second image light LB toward the first dichroic mirror 40 and the second dichroic mirror 50 along the Y1 direction. The third self-emissive display device 13 emits a third image light LR toward the first dichroic mirror 40 and the second dichroic mirror 50 along the Y2 direction. Here, Figure 2 is a schematic front view of the light-emitting display surface of the first self-emissive display device 11 as seen in the X1 direction. Figure 3 is a schematic side view of the side of the first self-emissive display device 11 as seen in the Y2 direction. As shown in Figures 2 and 3, the first self-emissive display device 11 comprises a substrate 14 and a plurality of light-emitting elements 15 arranged in a matrix on the substrate 14. The optical axis N of each light-emitting element 15 is perpendicular to the substrate 14. In other words, the optical axes N of each light-emitting element 15 are parallel to each other. Each light-emitting element 15 emits image light. The second self-emissive display device 12 and the third self-emissive display device 13 have a similar configuration.

[0015] As shown in Figure 1, the first dichroic mirror 40 comprises a glass plate 41 and a first dichroic film 42 provided on the first surface 41a of the glass plate 41 facing the X2 direction. The first dichroic mirror 40 transmits the first image light LG and the third image light LR. The first dichroic mirror 40 also reflects the second image light LB in the X2 direction.

[0016] The second dichroic mirror 50 comprises a glass plate 51 and a second dichroic film 52 provided on the first surface 51a of the glass plate 51 facing the X2 direction. The second dichroic mirror 50 transmits the first image light LG and the second image light LB. The second dichroic mirror 50 also reflects the third image light LR in the X2 direction.

[0017] The first image light LG from the first self-emissive display device 11 and the second image light LB from the second self-emissive display device 12 are combined by the first dichroic mirror 40 and directed in the X2 direction. Similarly, the first image light LG from the first self-emissive display device 11 and the third image light LR from the third self-emissive display device 13 are combined by the second dichroic mirror 50 and directed in the X2 direction. The combined light from the first dichroic mirror 40 and the second dichroic mirror 50 overlaps to form image light L directed in the X2 direction. Image light L enters the projection optical system 3.

[0018] According to this embodiment, the image light emitted from the first self-illuminating display device 11, the second self-illuminating display device 12, and the third self-illuminating display device 13 is superimposed by the first dichroic mirror 40 and the second dichroic mirror 50 before being incident on the projection optical system 3. Since a dichroic prism is not used to superimpose the image light emitted from the three self-illuminating display devices, the generation of stray light caused by reflection within the prism can be prevented.

[0019] In this embodiment, the first dichroic mirror 40 and the second dichroic mirror 50 intersect at a 90° angle to each other. Therefore, the installation space required for arranging the first dichroic mirror 40 and the second dichroic mirror 50 can be reduced.

[0020] Furthermore, the display panel is a self-emissive display device capable of high-brightness illumination, eliminating the need for a separate light source or a large power supply to power the light source, thus enabling a smaller and lighter overall projection device 1A.

[0021] For example, as shown in Figure 4, it becomes possible to incorporate the projection device 1A into a thin portable device MD such as a smartphone equipped with various devices such as a camera CA, and project images.

[0022] Furthermore, as illustrated in Figure 5, the projection device 1A can be easily installed in the glasses GA worn by the observer or wearer US, and an image can be projected into the real space in front of the observer or wearer US's line of sight. In addition, by adding a switching mechanism CH that can project the image from the projection device 1A onto the glasses lens GL of the glasses GA, the glasses GA can be configured as a head-up display.

[0023] Furthermore, as illustrated in Figures 6 and 7, the degree of freedom in installing the projection device 1A is increased for the viewer M, making installation easier. Multiple projection devices 1A can be easily installed on the viewer M's seat CM or ceiling CL, and the viewer M can view the image using the wall WA as a screen SC. The seat CM can also be the driver's seat of a car.

[0024] Furthermore, in portable devices such as MDs, camera-based photodetectors (CAs) can be used to detect the position of the screen (SC) and even sense the shape of the projection surface, enabling higher quality display images. It is also possible to integrate photodetectors into self-emissive display devices, providing the same functionality as camera-based CAs.

[0025] [Embodiment 2] Figure 8 is an explanatory diagram of the projection device of Embodiment 2. The projection device 1B of Embodiment 2 differs from the projection device of Embodiment 1 in the configuration of the first dichroic mirror 40 and the second dichroic mirror 50. Note that the other components of the projection device 1B of Embodiment 2 are the same as those of the projection device 1A of Embodiment 1, so the same reference numerals are used for the corresponding components and their descriptions are omitted.

[0026] As shown in Figure 8, in the image forming unit 2, the first dichroic mirror 40 and the second dichroic mirror 50 are arranged in a crisscross pattern. Each self-illuminating display device surrounds the first dichroic mirror 40 and the second dichroic mirror 50 from three directions. The projection optical system 3 is located on the opposite side from the first self-illuminating display device 11, with the first dichroic mirror 40 and the second dichroic mirror 50 in between.

[0027] As shown in Figure 8, the first dichroic mirror 40 comprises a glass plate 41 and a first dichroic film 42 provided on the first surface 41a of the glass plate 41 facing the X2 direction. The first dichroic mirror 40 transmits the first image light LG and the third image light LR. The first dichroic mirror 40 also reflects the second image light LB in the X2 direction. Furthermore, the first dichroic mirror 40 is provided with a frame-shaped first light absorbing portion 43 on the outer peripheral edge of the first surface 41a. The first light absorbing portion 43 absorbs the peripheral light of the first image light LG and the peripheral light of the second image light LB. The first light absorbing portion 43 may also absorb the first image light LG, the second image light LB, and the third image light LR.

[0028] The second dichroic mirror 50 comprises a glass plate 51 and a second dichroic film 52 provided on the first surface 51a of the glass plate 51 facing the X2 direction. The second dichroic mirror 50 transmits the first image light LG and the second image light LB. The second dichroic mirror 50 also reflects the third image light LR in the X2 direction. Furthermore, the second dichroic mirror 50 is provided with a frame-shaped second light absorbing portion 53 on the outer peripheral edge of the first surface 51a. The second light absorbing portion 53 absorbs the peripheral light of the first image light LG and the peripheral light of the third image light LR. The second light absorbing portion 53 may also absorb the first image light LG, the third image light LR, and the second image light LB.

[0029] In this embodiment, the image light emitted from the first self-illuminating display device 11, the second self-illuminating display device 12, and the third self-illuminating display device 13 is superimposed by the first dichroic mirror 40 and the second dichroic mirror 50 before being incident on the projection optical system 3. Since a dichroic prism is not used to superimpose the image light emitted from the three self-illuminating display devices, the generation of stray light caused by reflection within the prism can be prevented.

[0030] Furthermore, in this embodiment, the first dichroic mirror 40 is provided with a frame-shaped first light-absorbing section 43 on its outer edge. The first light-absorbing section 43 absorbs the peripheral light of the first image light LG and the peripheral light of the second image light LB. The second dichroic mirror 50 is provided with a frame-shaped second light-absorbing section 53 on its outer edge. The second light-absorbing section 53 absorbs the peripheral light of the first image light LG and the peripheral light of the third image light LR. Therefore, it is possible to suppress the stray light that occurs when the peripheral light of the image light L emitted from the first dichroic mirror 40 and the second dichroic mirror 50 does not enter the projection optical system 3.

[0031] [Embodiment 3] Figure 9 is an explanatory diagram of the projection device 1C of Embodiment 3. The projection device 1C of Embodiment 3 differs from the projection device 1A of Embodiment 1 in that it is equipped with three spatial filters. Note that the other components of the projection device 1C of Embodiment 3 are the same as those of the projection device 1A of Embodiment 1, so the same reference numerals are used for the corresponding components and their descriptions are omitted.

[0032] As shown in Figure 9, in the image forming unit 2, the first dichroic mirror 40 and the second dichroic mirror 50 are arranged in a crisscross pattern. The first self-illuminating display device 11, the second self-illuminating display device 12, and the third self-illuminating display device 13 surround the first dichroic mirror 40 and the second dichroic mirror 50 from three directions. The projection optical system 3 is located on the opposite side from the first self-illuminating display device 11, with the first dichroic mirror 40 and the second dichroic mirror 50 in between.

[0033] In this embodiment, the image forming unit 2 includes a first spatial filter 61 positioned between the first self-emissive display device 11 and the first dichroic mirror 40. The image forming unit 2 also includes a second spatial filter 62 positioned between the second self-emissive display device 12 and the first dichroic mirror 40. Furthermore, the image forming unit 2 includes a third spatial filter 63 positioned between the third self-emissive display device 13 and the second dichroic mirror 50.

[0034] The first spatial filter 61 comprises a glass plate 65, a frame-shaped first light-absorbing section 66G provided on the outer edge of the glass plate 65, and a first light-transmitting section 67G which is the portion of the glass plate 65 on the inner side of the first light-absorbing section 66G. The first light-absorbing section 66G absorbs ambient light of the first image light LG. The first light-transmitting section 67G transmits the first image light LG. The second spatial filter 62 comprises a glass plate 65, a frame-shaped second light-absorbing section 66B provided on the outer edge of the glass plate 65, and a second light-transmitting section 67B which is the portion of the glass plate 65 on the inner side of the second light-absorbing section 66B. The second light-absorbing section 66B absorbs ambient light of the second image light LB. The second light-transmitting section 67B transmits the second image light LB. The third spatial filter 63 comprises a glass plate 65, a frame-shaped third light absorbing portion 66R provided on the outer edge of the glass plate 65, and a third transmitting portion 67R which is the portion of the glass plate 65 on the inner side of the third light absorbing portion 66R. The third light absorbing portion 66R absorbs ambient light of the third image light LR. The third transmitting portion 67R transmits the third image light LR.

[0035] In this embodiment, the first spatial filter 61, the second spatial filter 62, and the third spatial filter 63 are the same component. That is, the first light absorbing portion 66G of the first spatial filter 61, the second light absorbing portion 66B of the second spatial filter 62, and the third light absorbing portion 66R of the third spatial filter 63 all absorb the first image light LG, the second image light LB, and the third image light LR. In addition, the first transmitting portion 67G of the first spatial filter 61, the second transmitting portion 67B of the second spatial filter 62, and the third transmitting portion 67R of the third spatial filter 63 all transmit the first image light LG, the second image light LB, and the third image light LR.

[0036] In this embodiment, the image light emitted from the first self-illuminating display device 11, the second self-illuminating display device 12, and the third self-illuminating display device 13 is superimposed by the first dichroic mirror 40 and the second dichroic mirror 50 before being incident on the projection optical system 3. Since a dichroic prism is not used to superimpose the image light emitted from the three self-illuminating display devices, the generation of stray light caused by reflection within the prism can be prevented.

[0037] Furthermore, the projection device 1C of this embodiment includes a first spatial filter 61 positioned between a first self-emissive display device 11 and a first dichroic mirror 40, a second spatial filter 62 positioned between a second self-emissive display device 12 and a first dichroic mirror 40, and a third spatial filter 63 positioned between a third self-emissive display device 13 and a second dichroic mirror 50. The first spatial filter 61 includes a frame-shaped first light-absorbing section 66G that absorbs ambient light of the first image light LG and a first light-transmitting section 67G that transmits the first image light LG. The second spatial filter 62 includes a frame-shaped second light-absorbing section 66B that absorbs ambient light of the second image light LB and a second light-transmitting section 67B that transmits the second image light LB. The third spatial filter 63 comprises a frame-shaped third light absorbing section 66R that absorbs peripheral light of the third image light LR, and a third transmitting section 67R that transmits the third image light LR. Therefore, it is possible to suppress the stray light that occurs when peripheral light of the image light L does not enter the projection optical system 3.

[0038] The first dichroic mirror 40 may also include a frame-shaped first light absorbing section 43 that absorbs the peripheral light of the first image light LG and the peripheral light of the second image light LB, similar to Embodiment 2. Furthermore, the second dichroic mirror 50 may also include a frame-shaped second light absorbing section 53 that absorbs the peripheral light of the first image light LG and the peripheral light of the third image light LR, similar to Embodiment 2. This configuration further suppresses the stray light caused by the peripheral light of the image light L not entering the projection optical system 3.

[0039] [Embodiment 4] Figure 10 is an explanatory diagram of the projection device 1D of Embodiment 4. Figure 11 is an explanatory diagram of the angle limiting filter. The projection device 1D of Embodiment 4 differs from the projection device 1A of Embodiment 1 in that it is equipped with three angle limiting filters. Note that the other components of the projection device 1D of Embodiment 4 are the same as those of the projection device 1A of Embodiment 1, so the same reference numerals are used for the corresponding components and their descriptions are omitted.

[0040] As shown in Figure 10, in the image forming unit 2, the first dichroic mirror 40 and the second dichroic mirror 50 are arranged in a crisscross pattern. The first self-illuminating display device 11, the second self-illuminating display device 12, and the third self-illuminating display device 13 surround the first dichroic mirror 40 and the second dichroic mirror 50 from three directions. The projection optical system 3 is located on the opposite side from the first self-illuminating display device 11, with the first dichroic mirror 40 and the second dichroic mirror 50 in between.

[0041] In this embodiment, the image forming unit 2 has angle limiting filters 70 positioned between the first self-emissive display device 11 and the first dichroic mirror 40, between the second self-emissive display device 12 and the first dichroic mirror 40, and between the third self-emissive display device 13 and the second dichroic mirror 50.

[0042] The angle limiting filter 70 comprises, for example, a glass plate 71 and a resin grid structure 72 provided on one side of the glass plate 71, as shown in Figure 11. The grid structure 72 is positioned in front of each light-emitting element 15 of the self-emissive display device and narrows the light distribution angle of the image light emitted from each light-emitting element 15. As a result, the light distribution angle of the first image light LG of the first self-emissive display device 11 is narrowed. The light distribution angle of the second image light LB of the second self-emissive display device 12 is narrowed. In addition, the light distribution angle of the third image light LR of the third self-emissive display device 13 is narrowed.

[0043] In this embodiment, the image light emitted from the first self-illuminating display device 11, the second self-illuminating display device 12, and the third self-illuminating display device 13 is superimposed by the first dichroic mirror 40 and the second dichroic mirror 50 before being incident on the projection optical system 3. Since a dichroic prism is not used to superimpose the image light emitted from the three self-illuminating display devices, the generation of stray light caused by reflection within the prism can be prevented.

[0044] Furthermore, in this embodiment, the three angle limiting filters 70 narrow the light distribution angle of the first image light LG of the first self-emissive display device 11, the light distribution angle of the second image light LB of the second self-emissive display device 12, and the light distribution angle of the third image light LR of the third self-emissive display device 13. Therefore, it is possible to suppress the stray light that occurs when peripheral light from the first image light LG, the second image light LB, and the third image light LR does not enter the projection optical system 3.

[0045] In this embodiment as well, the first dichroic mirror 40 may include a frame-shaped first light absorbing section 43 that absorbs the peripheral light of the first image light LG and the peripheral light of the second image light LB, similar to Embodiment 2. Furthermore, the second dichroic mirror 50 may include a frame-shaped second light absorbing section 53 that absorbs the peripheral light of the first image light LG and the peripheral light of the third image light LR, similar to Embodiment 2. This configuration further suppresses the stray light caused by the peripheral light of the image light L not entering the projection optical system 3.

[0046] Furthermore, in this embodiment as well, the three spatial filters of Embodiment 3 may be provided. In addition, along with the three spatial filters, the first dichroic mirror 40 may be provided with a first light absorbing section 43, and the second dichroic mirror 50 may be provided with a second light absorbing section 53.

[0047] Figure 12 shows another example of the angle limiting filter 70. As shown in Figure 12, the angle limiting filter 70 in this example comprises a plurality of lenses 75 arranged in a matrix. The plurality of lenses 75 each refract the image light emitted from each light-emitting element 15 of the light-emitting display device, thereby narrowing the light distribution angle.

[0048] [Example 1] In Embodiment 2, where each dichroic mirror has a light-absorbing section, and in Embodiment 3, where a spatial filter is included, the first self-illuminating display device, the second self-illuminating display device, and the third self-illuminating display device may have an in-plane angular distribution. Figure 13 is an explanatory diagram of a self-illuminating display device with an in-plane angular distribution viewed from the front. Figure 14 is an explanatory diagram of a self-illuminating display device with an in-plane angular distribution viewed from the side.

[0049] As shown in Figures 13 and 14, each light-emitting display device comprises a substrate 14 and a plurality of light-emitting elements 15 arranged in a matrix on the substrate. Of the plurality of light-emitting elements 15, the optical axis N of the plurality of inner light-emitting elements 15A arranged in a matrix in the central part is perpendicular to the substrate. Of the plurality of light-emitting elements 15, the optical axis N of the plurality of outer peripheral light-emitting elements 15B arranged in a frame shape on the outer periphery of the plurality of inner light-emitting elements 15A is inclined toward the inner periphery.

[0050] In Embodiment 2, when the first self-emissive display device 11, the second self-emissive display device 12, and the third self-emissive display device 13 each employ self-emissive display devices equipped with in-plane angular distributions, the amount of light absorbed by the light-absorbing portion in the peripheral light of the image light of each self-emissive display device can be suppressed. Therefore, it is possible to suppress differences in light intensity between the peripheral and central portions of the image light L. Furthermore, in Embodiment 3, when the first self-emissive display device 11, the second self-emissive display device 12, and the third self-emissive display device 13 each have in-plane angular distributions, the amount of light absorbed by the spatial filter in the peripheral light of the image light of each self-emissive display device can be suppressed. Therefore, it is possible to suppress differences in light intensity between the peripheral and central portions of the image light L.

[0051] [Differentiation 2] In Embodiment 2, where each dichroic mirror has a light-absorbing section, and in Embodiment 3, where a spatial filter is included, the first self-emissive display device 11, the second self-emissive display device 12, and the third self-emissive display device 13 may have an emission intensity distribution. Figure 15 is a schematic diagram of a projection device when the self-emissive display device has an emission intensity distribution. Figure 16 is an explanatory diagram of a self-emissive display device having an emission intensity distribution.

[0052] As shown in Figure 15, in the projection device 1E of this example, the display drive unit 7 of the control unit 4 includes a light emission intensity control unit. As shown in Figure 16, the light emission intensity control unit makes the light emission intensity of the multiple outer peripheral light-emitting elements 15B, which are arranged in a frame shape on the outer periphery of the multiple light-emitting elements 15B, stronger than the light emission intensity of the multiple inner light-emitting elements 15A, which are arranged inside the outer peripheral light-emitting elements 15B, in each light-emitting display device. As a result, the amount of ambient light is increased when the image light from each light-emitting display device is increased.

[0053] Therefore, in Embodiment 2, if each of the first self-emissive display device 11, the second self-emissive display device 12, and the third self-emissive display device 13 is equipped with an emission intensity distribution, it is possible to suppress the difference in light intensity between the peripheral and central portions of the image light L when a portion of the ambient light of the image light of each self-emissive display device is absorbed by the light absorption portion. Also, in Embodiment 3, if each of the first self-emissive display device 11, the second self-emissive display device 12, and the third self-emissive display device 13 is equipped with an emission intensity distribution, it is possible to suppress the difference in light intensity between the peripheral and central portions of the image light L when a portion of the ambient light of the image light of each self-emissive display device is absorbed by the spatial filter.

[0054] [Other embodiments] In each embodiment and modification, the arrangement of the first self-illuminating display device 11, the second self-illuminating display device 12, the third self-illuminating display device 13, the first dichroic mirror 40, and the second dichroic mirror 50 of the image forming unit 2 may be changed. Figure 17 is an explanatory diagram of a first arrangement example in which the first dichroic mirror 40 and the second dichroic mirror 50 are separated in the X-axis direction. Figure 18 is an explanatory diagram of a second arrangement example in which the first dichroic mirror 40 and the second dichroic mirror 50 are separated in the X-axis direction.

[0055] In the first arrangement example shown in Figure 17, the first self-illuminating display device 11, the first dichroic mirror 40, and the second dichroic mirror 50 are arranged in this order along the X-axis. The first dichroic mirror 40 and the second dichroic mirror 50 are tilted in the same direction. That is, both the first dichroic mirror 40 and the second dichroic mirror 50 are tilted in the Y1 direction toward the X2 direction. The second self-illuminating display device 12 is located in the Y2 direction of the first dichroic mirror 40. The third self-illuminating display device 13 is located in the Y2 direction of the first dichroic mirror 40.

[0056] The first self-emissive display device 11 emits a first image light LG toward the first dichroic mirror 40 and the second dichroic mirror 50. The second self-emissive display device 12 emits a second image light LB toward the first dichroic mirror 40. The third self-emissive display device 13 emits a third image light LR toward the second dichroic mirror 50. The first dichroic mirror 40 transmits the first image light LG and reflects the second image light LB, emitting a first combined light L1 which is a combination of the first image light LG and the second image light LB. The second dichroic mirror 50 transmits the first combined light L1 and reflects the third image light LR. The first combined light L1 and the third image light LR overlap. The second dichroic mirror 50 emits image light L in the X2 direction.

[0057] In the second arrangement example shown in Figure 18, the first self-illuminating display device 11, the first dichroic mirror 40, and the second dichroic mirror 50 are arranged in this order along the X-axis. The first dichroic mirror 40 and the second dichroic mirror 50 are tilted in different directions from each other. That is, the first dichroic mirror 40 is tilted in the Y1 direction toward the X2 direction. The second dichroic mirror 50 is tilted in the Y2 direction toward the X2 direction. The second self-illuminating display device 12 is located in the Y2 direction of the first dichroic mirror 40. The third self-illuminating display device 13 is located in the Y1 direction of the second dichroic mirror 50.

[0058] The first self-emissive display device 11 emits a first image light LG toward the first dichroic mirror 40 and the second dichroic mirror 50. The second self-emissive display device 12 emits a second image light LB toward the first dichroic mirror 40. The third self-emissive display device 13 emits a third image light LR toward the second dichroic mirror 50. The first dichroic mirror 40 transmits the first image light LG and reflects the second image light LB, emitting a first combined light L1 which is a combination of the first image light LG and the second image light LB. The second dichroic mirror 50 transmits the first combined light L1 and reflects the third image light LR. The first combined light L1 and the third image light LR overlap. The second dichroic mirror 50 emits image light L in the X2 direction.

[0059] By adopting these first and second arrangement examples, the installation of the first dichroic mirror 40 and the second dichroic mirror 50 becomes easier compared to the case where the first dichroic mirror 40 and the second dichroic mirror 50 are crossed. [Explanation of Symbols]

[0060] 1A, 1B, 1C, 1D, 1E…Projection device, 2…Image forming unit, 3…Projection optical system, 4…Control unit, 5…Power supply unit, 6…Image processing unit, 7…Display drive unit, 8…Housing, 11…First self-emissive display device, 12…Second self-emissive display device, 13…Third self-emissive display device, 15…Light-emitting element, 15A…Inner light-emitting element, 15B…Outer side light-emitting element, 40…First dichroic mirror, 41…Glass plate, 41a…First surface, 42…First dichroic film, 43…First light-absorbing unit, 50…Second dichroic mirror, 51…Glass plate, 51a…First surface, 52…Second dichroic film, 53…Second light-absorbing unit, 61…First spatial filter, 6 2...Second spatial filter, 63...Third spatial filter, 65...Glass plate, 66G...First light absorption section, 66B...Second light absorption section, 66R...Third light absorption section, 67G...First transmission section, 67B...Second transmission section, 67R...Third transmission section, 70...Angle limiting filter, 71...Glass plate, 72...Grid structure, 75...Lens, L...Image light, L1...First composite light, LG...First image light, LB...Second image light, LR...Third image light, N...Optical axis of light-emitting element, CA...Camera, CH...Switching mechanism, CL...Ceiling, CM...Seating area, GA...Glasses, GL...Glasses lens, M...Viewer, MD...Mobile device, S...Screen, SC...Screen, US...Wearer, WA...Wall.

Claims

1. A first dichroic mirror that transmits light of a first wavelength and reflects light of a second wavelength, A second dichroic mirror that transmits light of the first wavelength and reflects light of the third wavelength, A first self-emissive display device having a plurality of first light-emitting elements that emit light of the first wavelength, and which emits first image light toward the first dichroic mirror and the second dichroic mirror using light of the first wavelength, A second self-emissive display device having a plurality of second light-emitting elements that emit light of the second wavelength, and emitting a second image light toward the first dichroic mirror using the light of the second wavelength, A third self-emissive display device having a plurality of third light-emitting elements that emit light of the third wavelength, and which emits a third image light toward the second dichroic mirror using the light of the third wavelength, A projection optical system that projects the image light synthesized by the first dichroic mirror and the second dichroic mirror onto a projection target, A control unit that controls the first self-illuminating display device, the second self-illuminating display device, and the third self-illuminating display device, A power supply unit that supplies power to the first self-illuminating display device, the second self-illuminating display device, the third self-illuminating display device, and the control unit, It has, The first dichroic mirror includes a frame-shaped first light-absorbing section that absorbs ambient light from the first image light and ambient light from the second image light. The projection device is characterized in that the second dichroic mirror includes a frame-shaped second light-absorbing section that absorbs ambient light from the first image light and ambient light from the third image light.

2. The projection device according to claim 1, characterized in that the first dichroic mirror and the second dichroic mirror intersect.

3. The projection device according to claim 1, characterized in that the first dichroic mirror and the second dichroic mirror are arranged at a distance from each other.

4. Each of the first self-illuminating display device, the second self-illuminating display device, and the third self-illuminating display device comprises a plurality of light-emitting elements arranged in a matrix, The projection device according to any one of claims 1 to 3, characterized in that, of the plurality of light-emitting elements, the optical axes of the plurality of outer-circumferential light-emitting elements arranged in a frame shape on the outer circumference are inclined toward the inner circumference.

5. The control unit controls the light emission intensity of each light-emitting element in each of the first self-emitting display device, the second self-emitting display device, and the third self-emitting display device. The projection device according to any one of claims 1 to 3, characterized in that the light emission intensity of the plurality of outer peripheral light-emitting elements, which are arranged in a frame-like manner on the outer periphery, is stronger than the light emission intensity of the plurality of inner light-emitting elements, which are arranged inside the plurality of outer peripheral light-emitting elements.

6. An angle limiting filter is provided between the first self-illuminating display device and the first dichroic mirror, between the second self-illuminating display device and the first dichroic mirror, and between the third self-illuminating display device and the second dichroic mirror, Each of the first self-illuminating display device, the second self-illuminating display device, and the third self-illuminating display device comprises a plurality of light-emitting elements arranged in a matrix, The projection apparatus according to any one of claims 1 to 3, characterized in that the angle limiting filter narrows the light distribution angle of the image light emitted from each light-emitting element.

Images