JP6805833B2 - Projection-type image display device and projection-type image display system - Google Patents

Description

The present invention relates to a projection type image display device and a projection type image display system.

The projection type image display system can display a high-definition image on a large screen by displaying images projected from a plurality of projection type image display devices side by side on a screen. Patent Document 1 describes an example of a projection type image display system in which a plurality of projection type image display devices are arranged in a horizontal direction.

JP-A-2007-47366

In the projection type image display device, an image having a high dot density dpi (dots per inch) can be displayed by reducing the projected image size. In the projection type image display system, by arranging the projection type image display devices adjacent to each other, the images projected from a plurality of projection type image display devices are displayed side by side on the screen as an image having a high dot density dpi. ..

However, when the projection type image display devices are arranged adjacent to each other and the distance between the projection type image display devices, specifically, the distance between the projection lenses is wider than the image size, from each projection type image display device. There are gaps between the projected images. In order to reduce the distance between the projection type image display devices, it is necessary to reduce the size of the projection type image display device, specifically, the distance from the outer peripheral portion of the projection type image display device to the projection lens.

If the optical axis of the projection lens is shifted from the optical axis of the image light or the image light emitted from the projection lens is reflected by the mirror so that there are no gaps between the images, the displayed image will be distorted. It may occur and cause deterioration of image quality.

The present invention is a projection type image display device and a projection type capable of displaying images projected from a plurality of projection type image display devices side by side on a screen as an image having high dot density while maintaining high image quality. An object of the present invention is to provide an image display system.

The present invention uses an illumination light source that emits illumination light, a reflective optical modulation device that photomodulates the illumination light to generate image light, a drive substrate that drives the reflective optical modulation device, and the image light. a projection type image display apparatus Ru and a projection lens for projecting a two-dimensional image of the horizontal and vertical directions, the drive substrate, a first optical surface of the driving substrate is an optical axis of the illumination light source The two-dimensional image is arranged at a position perpendicular to the first optical axis along the axis , and the width of the two-dimensional image in the vertical direction is the vertical direction of the projection type image display device. The distance from the second optical axis, which is the optical axis of the projection lens, to one end in the vertical direction at the outer peripheral portion of the projection type image display device is the width in the vertical direction of the two-dimensional image. is a half or less, the second distance from the optical axis to the other end of the vertical direction in the outer peripheral portion of the projection type image display apparatus is greater projection morphism than half the vertical width of the two-dimensional image A type image display device is provided.

The present invention includes a plurality of projection type image display devices arranged in the horizontal direction and the vertical direction, and each projection type image display device in the plurality of projection type image display devices includes an illumination light source that emits illumination light and the above. A reflection type light modulation device that photomodulates illumination light to generate image light, a drive substrate that drives the reflection type light modulation device, and projection that projects the image light as a two-dimensional image in a horizontal direction and a vertical direction. and a lens, the driving substrate, first along the optical axis side of the driving substrate is an optical axis of the illumination light source, the vertical of the first of the two-dimensional image with respect to the optical axis Arranged at a position in the direction, the vertical width of the two-dimensional image is smaller than the vertical width of each projection type image display device, and the width from the second optical axis, which is the optical axis of the projection lens, is the same. The distance from the outer peripheral portion of each projection type image display device to one end in the vertical direction is less than half the width of the two-dimensional image in the vertical direction, and the projection type image display is performed from the second optical axis. Provided is a projection image display system in which the distance to the other vertical end of the outer periphery of the device is greater than half the vertical width of the two-dimensional image .

According to the projection type image display device and the projection type image display system of the present invention, an image projected from a plurality of projection type image display devices is displayed as a gap on the screen as an image having a high dot density dpi while maintaining high image quality. It can be displayed side by side.

It is a block diagram which shows the optical system of the projection type image display apparatus of one Embodiment. It is a perspective view which shows the positional relationship of each component part of the projection type image display apparatus of one Embodiment. It is a block diagram which shows the drive board. It is a perspective view which shows the positional relationship of each component part of the projection type image display apparatus of one Embodiment. It is a top view which shows the positional relationship of each component part of the projection type image display apparatus of one Embodiment. It is a side view which shows the positional relationship of each component part of the projection type image display apparatus of one Embodiment. It is a perspective view of the projection type image display system of one Embodiment.

A configuration example of the projection type image display device and the projection type image display system of one embodiment will be described with reference to FIGS. 1 to 7. First, the optical system of the projection type image display device 1 will be described with reference to FIG.

The projection type image display device 1 has a vertically disassembled three-plate optical system. Specifically, the projection type image display device 1 includes a red light source 10R, a green light source 10G, and a blue light source 10B constituting an illumination light source 10, collimating lenses 2a, 2b, 3a, 3b, 4a, 4b, and green light. The dichroic mirror 5G for red light, the dichroic mirror 5R for red light, the integrators 6a and 6b, the field lenses 7a and 7b, and the polarizing plate 8 are provided. Further, the projection type image display device 1 includes a vertical separation type color separation synthetic optical system 20, a red image display device 30R which is a reflection type light modulation device 30, a green image display device 30G, and a blue image display device 30B. It includes a projection lens 9.

Here, the left-right direction in FIG. 1 is defined as the optical axis PA1 direction of the projection lens 9, the vertical direction is defined as the vertical direction, and the front-back direction is defined as the horizontal direction. Further, the left side is defined as the illumination light source 10 side, the right side is defined as the projection lens 9 side, the lower side is defined as the first side in the vertical direction, and the upper side is defined as the second side in the vertical direction. The vertical and horizontal directions in FIG. 1 correspond to the vertical and horizontal directions of the displayed image.

In the red light source 10R, a red light emitting diode (hereinafter referred to as a red LED) 12R is connected on a printed wiring board 11R based on copper. By supplying electric power to the red LED 12R from the outside via the printed wiring board 11R, the red LED 12R irradiates the red illumination light L1R toward the collimating lenses 2a and 2b. A heat sink 13R is fixed to the surface of the printed wiring board 11R opposite to the surface to which the red LED 12R is connected.

In the green light source 10G, a green light emitting diode (hereinafter referred to as a green LED) 12G is connected on a copper-based printed wiring board 11G. By supplying electric power to the green LED 12G from the outside via the printed wiring board 11G, the green LED 12G irradiates the green illumination light L1G toward the collimating lenses 3a and 3b. A heat sink 13G is fixed to the surface of the printed wiring board 11G opposite to the surface to which the green LED 12G is connected.

In the blue light source 10B, a blue light emitting diode (hereinafter referred to as a blue LED) 12B is connected on a printed wiring board 11B based on copper. By supplying electric power to the blue LED 12B from the outside via the printed wiring board 11B, the blue LED 12B irradiates the blue illumination light L1B toward the collimating lenses 4a and 4b. A heat sink 13B is fixed to the surface of the printed wiring board 11B opposite to the surface to which the blue LED 12B is connected.

The collimating lenses 2a and 2b make the red illumination light L1R emitted from the red light source 10R parallel light. The collimating lenses 3a and 3b make the green illumination light L1G emitted from the green light source 10G parallel light. The collimating lenses 4a and 4b make the blue illumination light L1B emitted from the blue light source 10B parallel light.

The green light dichroic mirror 5G transmits the blue illumination light L1B and reflects the green illumination light L1G. The dichroic mirror 5R for red light transmits the blue illumination light L1B and the green illumination light L1G, and reflects the red illumination light L1R.

The integrators 6a and 6b make the illumination distributions of the red illumination light L1R, the green illumination light L1G, and the blue illumination light L1B uniform. A fly-eye lens may be used as the integrators 6a and 6b. The field lenses 7a and 7b collect the red illumination light L1R, the green illumination light L1G, and the blue illumination light L1B.

The polarizing plate 8 aligns the polarized light of the red illumination light L1R, the green illumination light L1G, and the blue illumination light L1B. In the present embodiment, the case where the polarizing plate 8 aligns the red illumination light L1R, the green illumination light L1G, and the blue illumination light L1B with s-polarized light will be described.

A blue light source 10B (specifically, a blue LED 12B), collimating lenses 4a and 4b, a dichroic mirror 5G for green light, a dichroic mirror 5R for red light, an integrator 6a and 6b, a field lens 7a and 7b, and polarization. The plate 8 is arranged on the optical axis PA2 parallel to the optical axis PA1 of the projection lens 9.

The blue illumination light L1B emitted from the blue light source 10B becomes parallel light by the collimating lenses 4a and 4b, and passes through the green light dichroic mirror 5G and the red light dichroic mirror 5R. The illumination distribution of the blue illumination light L1B is made uniform by the integrators 6a and 6b, and is condensed by the field lenses 7a and 7b. The blue illumination light L1B is aligned with s-polarized light by the polarizing plate 8 and is incident on the color separation synthesis optical system 20.

The red light source 10R, the green light source 10G, and the collimating lenses 2a, 2b, 3a, and 3b are arranged on the first side in the direction perpendicular to the optical axis PA2. The red light source 10R (specifically, the red LED 12R) and the collimating lenses 2a and 2b are arranged on the optical axis PA3. The green light source 10G (specifically, the green LED 12G) and the collimating lenses 3a and 3b are arranged on the optical axis PA4. The optical axis PA3 and the optical axis PA4 are parallel to each other and orthogonal to the optical axis PA2.

The green illumination light L1G emitted from the green light source 10G becomes parallel light by the collimating lenses 3a and 3b, is reflected by the green light dichroic mirror 5G, and is transmitted through the red light dichroic mirror 5R. The illumination distribution of the green illumination light L1G is made uniform by the integrators 6a and 6b, and is condensed by the field lenses 7a and 7b. The green illumination light L1G is aligned with s-polarized light by the polarizing plate 8 and is incident on the color separation synthesis optical system 20.

The red illumination light L1R emitted from the red light source 10R becomes parallel light by the collimating lenses 2a and 2b, and is reflected by the dichroic mirror 5R for red light. The illumination distribution of the red illumination light L1R is made uniform by the integrators 6a and 6b, and is condensed by the field lenses 7a and 7b. The red illumination light L1R is aligned with s-polarized light by the polarizing plate 8 and is incident on the color separation synthesis optical system 20. The red illumination light L1R, the green illumination light L1G, and the blue illumination light L1B are incident on the color separation synthesis optical system 20 through the optical axis PA2. Therefore, the optical axis PA2 is referred to as the optical axis of the illumination light source 10.

The color separation synthesis optical system 20 includes a first polarization beam splitter 40, a second polarization beam splitter 50, a third polarization beam splitter 60, and a fourth polarization beam splitter 70. The first to fourth polarization beam splitters 40, 50, 60, 70 have a rectangular parallelepiped shape.

The first and second polarization beam splitters 40 and 50 are arranged on the optical axis PA2. The third and fourth polarization beam splitters 60 and 70 are arranged on the optical axis PA1. The first and third polarization beam splitters 40 and 60 are arranged on the illumination light source 10 side, and the second and fourth polarization beam splitters 50 and 70 are arranged on the projection lens 9 side. The third polarization beam splitter 60 is arranged on the second side in the direction perpendicular to the first polarization beam splitter 40. The fourth polarization beam splitter 70 is arranged on the second side in the direction perpendicular to the second polarization beam splitter 50.

The first polarization beam splitter 40 has a polarization separation surface 41 that reflects s-polarized light and transmits p-polarized light. The second polarization beam splitter 50 has a polarization separation surface 51 that reflects s-polarized light and transmits p-polarized light. The third polarization beam splitter 60 has a polarization separation surface 61 that reflects s-polarized light and transmits p-polarized light. The fourth polarization beam splitter 70 has a polarization separation surface 71 that reflects s-polarized light and transmits p-polarized light. The first to fourth polarization beam splitters 40, 50, 60, 70 are arranged so that the polarization separation surfaces 41, 51, 61, 71 are X-shaped when viewed from the horizontal direction.

The color separation synthesis optical system 20 includes a first wavelength-selective polarization conversion plate 21, a second wavelength-selective polarization conversion plate 22, a third wavelength-selective polarization conversion plate 23, and a fourth wavelength selectivity. It has a polarization conversion plate 24. The first and fourth wavelength-selective polarization conversion plates 21 and 24 rotate the polarization plane of green light by 90 degrees. The second and third wavelength-selective polarization conversion plates 22 and 23 rotate the polarization plane of red light by 90 degrees.

The first wavelength selective polarization conversion plate 21 is arranged on the optical axis PA2. The third and fourth wavelength-selective polarization conversion plates 23 and 24 are arranged on the optical axis PA1. The first wavelength selective polarization conversion plate 21 is arranged on the illumination light source 10 side with respect to the first polarization beam splitter 40. The second wavelength selective polarization conversion plate 22 is arranged in the gap between the first polarization beam splitter 40 and the third polarization beam splitter 60. The third wavelength selective polarization conversion plate 23 is arranged in the gap between the third polarization beam splitter 60 and the fourth polarization beam splitter 70. The fourth wavelength selective polarization conversion plate 24 is arranged on the projection lens 9 side with respect to the fourth polarization beam splitter 70.

The blue image display device 30B is arranged on the optical axis PA1. The blue image display device 30B is arranged on the illumination light source 10 side with respect to the third polarization beam splitter 60. The blue image display device 30B photomodulates the irradiated blue illumination light L1B based on the image data of the blue component to generate the blue image light L2B. A heat sink 31B is fixed to a surface of the blue image display device 30B opposite to the surface irradiated with the blue illumination light L1B.

The red image display device 30R is arranged on the second side in the direction perpendicular to the third polarization beam splitter 60. The red image display device 30R photomodulates the irradiated red illumination light L1R based on the image data of the red component to generate the red image light L2R. A heat sink 31R is fixed to a surface of the red image display device 30R opposite to the surface irradiated with the red illumination light L1R.

The green image display device 30G is arranged on the optical axis PA2. The green image display device 30G is arranged on the projection lens 9 side with respect to the second polarization beam splitter 50. The green image display device 30G photomodulates the irradiated green illumination light L1G based on the image data of the green component to generate the green image light L2G. A heat sink 31G is fixed to a surface of the green image display device 30G opposite to the surface irradiated with the green illumination light L1G.

As the red image display device 30R, the green image display device 30G, and the blue image display device 30B, for example, a display pixel region having an aspect ratio of 16: 9, which has 3840 pixels in the horizontal direction and 2160 pixels in the vertical direction. A so-called 4K element having the above may be used. For example, the diagonal length of the display pixel region is about 0.7 inch, and the pixel pitch is about 4 μm.

The red illumination light L1R incident on the color separation synthesis optical system 20 passes through the first wavelength-selective polarization conversion plate 21 and is reflected by the polarization separation surface 41 of the first polarization beam splitter 40 to select the second wavelength. The sex polarization conversion plate 22 converts s-polarized light to p-polarized light. The red illumination light L1R passes through the third polarization beam splitter 60 and is photomodulated by the red image display device 30R to generate s-polarized red image light L2R.

The red image light L2R is reflected by the polarization separation surface 61 of the third polarization beam splitter 60, and is converted from s-polarized light to p-polarized light by the third wavelength-selective polarization conversion plate 23. The red image light L2R passes through the fourth polarization beam splitter 70 and the fourth wavelength selective polarization conversion plate 24 and is incident on the projection lens 9.

The green illumination light L1G incident on the color separation synthesis optical system 20 is converted from s-polarized light to p-polarized light by the first wavelength-selective polarization conversion plate 21. The green illumination light L1G passes through the first and second polarization beam splitters 40 and 50 and is photomodulated by the green image display device 30G to generate s-polarized green image light L2G.

The green image light L2G is reflected by the polarization separation surface 51 of the second polarization beam splitter 50, and further reflected by the polarization separation surface 71 of the fourth polarization beam splitter 70. The green image light L2G is converted from s-polarized light to p-polarized light by the fourth wavelength-selective polarization conversion plate 24, and is incident on the projection lens 9.

The blue illumination light L1B incident on the color separation synthesis optical system 20 passes through the first wavelength-selective polarization conversion plate 21 and is reflected by the polarization separation surface 41 of the first polarization beam splitter 40 to select the second wavelength. It transmits through the sex polarization conversion plate 22. The blue illumination light L1B is reflected by the polarization separation surface 61 of the third polarization beam splitter 60 and is photomodulated by the blue image display device 30B to generate p-polarized blue image light L2B.

The blue image light L2B passes through the third polarization beam splitter 60, the third wavelength selective polarization conversion plate 23, the fourth polarization beam splitter 70, and the fourth wavelength selective polarization conversion plate 24, and is a projection lens. It is incident on 9.

The projection lens 9 projects the red image light L2R, the green image light L2G, and the blue image light L2B onto a screen or the like as two-dimensional images in the horizontal direction and the vertical direction, and displays a full-color image.

The positional relationship of each component of the projection type image display device 1 will be described with reference to FIGS. 2 to 6. As shown in FIG. 2, the projection type image display device 1 includes an illumination box 80 and a drive board 90 for driving a reflection type light modulation device 30. Specifically, the drive board 90 is a red drive board 90R for driving a red image display device 30R, a green drive board 90G for driving a green image display device 30G, and a blue drive for driving a blue image display device 30B. Includes substrate 90B.

In FIG. 2, the heat sinks 31R, 31G, 31B, and the first to fourth wavelengths are selected in order to make it easier to understand the positional relationship between the red image display device 30R, the green image display device 30G, and the blue image display device 30B. The display of the sex polarization conversion plates 21 to 24 is omitted.

The illumination box 80 includes the illumination light source 10 shown in FIG. 1, collimating lenses 2a, 2b, 3a, 3b, 4a, 4b, a dichroic mirror 5G for green light, a dichroic mirror 5R for red light, and an integrator 6a, 6b. , The field lenses 7a and 7b, and the polarizing plate 8 are housed. The heat sinks 13R, 13G, and 13B of the illumination light source 10 are arranged so as to be located outside the illumination box 80.

The red drive board 90R is connected to the red image display device 30R via a flexible wiring board (hereinafter referred to as FPC) 91R. The green drive board 90G is connected to the green image display device 30G via the FPC 91G. The blue drive board 90B is connected to the blue image display device 30B via the FPC 91B.

As shown in FIG. 3, the drive board 90 includes a printed wiring board 92, a drive element 93, an FPC connector 94, a power supply connector 95, and a signal input connector 96. Specifically, the red drive board 90R has a red printed wiring board 92R, a red drive element 93R, a red FPC connector 94R, a red power connector 95R, and a red signal input connector 96R. ..

The red FPC connector 94R is connected to the FPC91R. Image data of the red component is input to the red signal input connector 96R from the outside. The red drive element 93R drives the red image display device 30R via the red FPC connector 94R and the FPC 91R based on the input image data.

The green drive board 90G includes a green printed wiring board 92G, a green drive element 93G, a green FPC connector 94G, a green power connector 95G, and a green signal input connector 96G. The green FPC connector 94G is connected to the FPC 91G. Image data of the green component is input from the outside to the green signal input connector 96G. The green drive element 93G drives the green image display device 30G via the green FPC connector 94G and the FPC 91G based on the input image data.

The blue drive board 90B includes a blue printed wiring board 92B, a blue drive element 93B, a blue FPC connector 94B, a blue power connector 95B, and a blue signal input connector 96B. The blue FPC connector 94B is connected to the FPC 91B. Image data of a blue component is input to the blue signal input connector 96B from the outside. The blue drive element 93B drives the blue image display device 30B via the blue FPC connector 94B and the FPC 91B based on the input image data.

The power connector 95 (95R, 95G, 95B) is connected to an external power source. Power is supplied to the drive board 90 (90R, 90G, 90B) from an external power source via the power connector 95 (95R, 95G, 95B). An LSI (large scale integration) may be used as the drive element 93 (93R, 93G, 93B).

The drive board 90 is arranged at a position perpendicular to the optical axis PA2 in the two-dimensional image so that the surface 90a of the drive board 90 is along the optical axis PA2 of the illumination light source 10. The red drive board 90R and the blue drive board 90B are perpendicular to the optical axis PA2 so that the surface 90aR of the red drive board 90R and the surface 90aB of the blue drive board 90B are along the optical axis PA2. It is located at the position on the second side of the direction. Specifically, the red drive substrate 90R and the blue drive substrate 90B are arranged in a gap located above the illumination box 80 and on the illumination light source 10 side of the color separation synthesis optical system 20.

The green drive board 90G is arranged at a position on the first side of the two-dimensional image in the direction perpendicular to the optical axis PA2 so that the surface 90aG of the green drive board 90G is along the optical axis PA2. Specifically, the green drive substrate 90G is arranged below the illumination box 80 and in a gap located on the projection lens 9 side of the illumination light source 10. That is, the drive board 90 (90R, 90G, 90B) is formed at a position perpendicular to the optical axis PA2 so that the surface 90a of the drive board 90 is along the optical axis PA2 of the illumination light source 10. It is placed in the void. In the drive board 90, it is preferable that the surface 90a of the drive board 90 is arranged parallel to the optical axis PA2.

When the length and width of the drive board 90 are different, that is, when the drive board 90 has a long side and a short side, the long side of the drive board 90 is reduced in order to reduce the horizontal width of the projection type image display device 1. It is preferable to arrange the drive substrate 90 so that is parallel to the optical axis PA2.

FIG. 5 shows a state in which the projection type image display device 1 shown in FIG. 4 is viewed from the red drive substrate 90R side. FIG. 6 shows a state in which the projection type image display device 1 is viewed from the horizontal direction.

As shown in FIGS. 4 to 6, the red drive board 90R has a heat sink 97R fixed to the surface of the red drive element 93R opposite to the red printed wiring board 92R. The green drive board 90G has a heat sink 97G fixed to the surface of the green drive element 93G opposite to the green printed wiring board 92G. The blue drive board 90B has a heat sink 97B fixed to the surface of the blue drive element 93B opposite to the blue printed wiring board 92B.

A configuration example of the projection type image display system of one embodiment will be described with reference to FIG. 7. The projection type image display system 100 has a configuration in which a plurality of projection type image display devices 1 are arranged in the horizontal direction and the vertical direction, specifically, a plurality of projection type image display devices 1 arranged in the horizontal direction are arranged in the vertical direction. It has a configuration arranged in two stages. The plurality of projection type image display devices 1 are arranged so that the optical axes PA1 are evenly spaced in the horizontal direction. The first-stage projection type image display device 1a and the second-stage projection type image display device 1b are arranged back to back so that the optical axes PA1 are close to each other.

The projection type image display system 100 can display a high-definition image on a large screen by displaying the images projected from the plurality of projection type image display devices 1a and 1b side by side on the screen. By reducing the image size projected from the projection type image display devices 1a and 1b, it is possible to display an image having a high dot density dpi.

Here, the minimum image size capable of displaying images projected from a plurality of projection type image display devices 1a and 1b as images having a high dot density dpi side by side without gaps on the screen, specifically, the minimum image size in the horizontal direction is X1. Let Y1 be the minimum image size in the vertical direction. For example, when a 4K element is used as the reflective light modulation device 30 and the image size is X1 = 120 mm, Y1 = 70 mm and the diagonal length is 5.5 inches, an image having a pixel pitch of about 32 μm and a high dot density dpi is displayed. Can be made to.

In order to display the images projected from the plurality of projection type image display devices 1 horizontally side by side on the screen without using a lens shift or a mirror, the length of the projection type image display device 1 in the horizontal direction is long. Must be less than or equal to X1.

When the horizontal length of the projection type image display device 1 is determined by the horizontal length of the drive board 90, as shown in FIG. 3, the length of the long side of the drive board 90 is D90 and the short side. Assuming that the length of is W90, as shown in FIG. 5, the drive substrate 90 has a relationship of W90 <X1. When the relationship of D90 <X1 is satisfied, the drive board 90 may be arranged so that the short side of the drive board 90 is parallel to the optical axis PA2.

In order to display the images projected from the plurality of projection type image display devices 1 side by side in the vertical direction on the screen without using a lens shift or a mirror, the optical axis PA1 to the vertical direction of the projection type image display device 1 The distance to the outer periphery on the second side of the direction must be Y1 / 2 or less.

Therefore, as shown in FIG. 6, the projection type image display device 1 has components within a range in which the distance on the second side in the vertical direction from the optical axis PA1 is less than Y1 / 2, specifically, heat sinks 31R and 97R. Is placed. As a result, as shown in FIG. 7, the first-stage projection type image display device 1a and the second-stage projection type image display device 1b are arranged back to back so that the optical axes PA1 are close to each other. Images projected from the projection type image display device 1a and the projection type image display device 1b can be displayed side by side in the vertical direction on the screen without using a lens shift or a mirror.

In the projection type image display device 1, the drive board 90 is arranged in the vertical direction of the optical axis PA1, the length W90 of the short side of the drive board 90 is less than the minimum image size X1 in the horizontal direction (W90 <X1), and the heat sink. The components such as 31R and 97R are arranged within a range in which the distance on the second side in the vertical direction from the optical axis PA1 is less than Y1 / 2.

As a result, the images projected from the plurality of projection type image display devices 1a and 1b can be displayed side by side in the horizontal and vertical directions on the screen as an image having a high dot density dpi while maintaining high image quality. Can be done.

The present invention is not limited to the configuration of the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, a white lamp or a laser light source may be used as the illumination light source 10. Further, the vertical separation type color separation synthesis optical system is not limited to the configuration of the color separation synthesis optical system 20 of the present embodiment.

Further, in the present embodiment, the case where the polarizing plate 8 aligns the illumination lights L1R, L1G, and L1B with s-polarized light has been described, but it may be configured to align with p-polarized light. In this case, the polarization separation surfaces 41, 51, 61, 71 of the first to fourth polarization beam splitters 40, 50, 60, 70 are configured to reflect p-polarized light and transmit s-polarized light.

Further, in the present embodiment, a 4K element having 3840 pixels in the horizontal direction and 2160 pixels in the vertical direction is used as the red image display device 30R, the green image display device 30G, and the blue image display device 30B. However, a 4K element having a number of pixels in the horizontal direction of 4096 and a number of pixels in the vertical direction of 2400 may be used, or a reflection type optical modulation element having another number of pixels may be used.

1 Projection type image display device 9 Projection lens 10 Illumination light source 30 Reflection type light modulation device 90 Drive board 90a surface 100 Projection type image display system L1R, L1G, L1B Illumination light (red illumination light, green illumination light, blue illumination light)
L2R, L2G, L2B image light (red image light, green image light, blue image light)

Claims (5)

An illumination light source that emits illumination light and
A reflective light modulation device that photomodulates the illumination light to generate image light,
A drive board for driving the reflective light modulation device and
A projection lens that projects the image light as a two-dimensional image in the horizontal and vertical directions,
A projection type image display apparatus Ru provided with,
The drive board is arranged at a position perpendicular to the first optical axis of the two-dimensional image so that the surface of the drive board is along the first optical axis which is the optical axis of the illumination light source. and,
The vertical width of the two-dimensional image is smaller than the vertical width of the projection type image display device.
The distance from the second optical axis, which is the optical axis of the projection lens, to one end in the vertical direction at the outer peripheral portion of the projection type image display device is less than half the width in the vertical direction of the two-dimensional image. ,
The distance from the second optical axis to the other end in the vertical direction at the outer peripheral portion of the projection type image display device is larger than half the vertical width of the two-dimensional image.
Projection morphism type image display device. The driving substrate has a long side and a short side, the driving board projection type image display apparatus according to請Motomeko 1 that are arranged such that the long side is parallel to the optical axis of the illumination light source .. The illumination light source includes a red light source that emits red illumination light, a green light source that emits green illumination light, and a blue light source that emits blue illumination light.
The reflective light modulation device includes a red image display device that photomodulates the red illumination light to generate red image light, a green image display device that photomodulates the green illumination light to generate green image light, and the like. It has a blue image display device that light-modulates the blue illumination light to generate blue image light.
It disposed on the first optical axis, passing through the green illumination light, a first polarization beam splitter for reflecting the red illumination light and the blue illumination light,
With the second polarization beam splitter on the first optical axis, which is arranged on the projection lens side with respect to the first polarization beam splitter, transmits the green illumination light, and reflects the green image light. ,
Arranged on the second optical axis and perpendicular to the first polarizing beam splitter, the red illumination light and the blue image light are transmitted, and the blue illumination light and the red image light are reflected. With a third polarization beam splitter
A fourth polarization that is on the second optical axis and is arranged perpendicular to the second polarization beam splitter, transmits the red image light and the blue image light, and reflects the green image light. Beam splitter and
The projection type image display device according to claim 1 or 2, further comprising. Equipped with multiple projection-type image display devices arranged in the horizontal and vertical directions,
Each projection type image display device in the plurality of projection type image display devices is
An illumination light source that emits illumination light and
A reflective light modulation device that photomodulates the illumination light to generate image light,
A drive board for driving the reflective light modulation device and
It has a projection lens that projects the image light as a two-dimensional image in the horizontal direction and the vertical direction.
The drive board is arranged at a position perpendicular to the first optical axis of the two-dimensional image so that the surface of the drive board is along the first optical axis which is the optical axis of the illumination light source. and,
The vertical width of the two-dimensional image is smaller than the vertical width of each projection type image display device.
The distance from the second optical axis, which is the optical axis of the projection lens, to one end in the vertical direction at the outer peripheral portion of each projection type image display device is less than half the width in the vertical direction of the two-dimensional image. Yes,
The distance from the second optical axis to the other end in the vertical direction at the outer peripheral portion of each projection type image display device is larger than half the vertical width of the two-dimensional image.
Throw Cum-type image display system. Wherein the plurality of projection type image display device disposed in a vertical direction, the projection type image display according to請Motomeko 4, wherein one end side of the outer peripheral portion of each projection-type image display device are arranged back to back system.

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