JP2002258405A - Projection device or projection type display device, and image processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection display or projection type display device which can prevent an image from deteriorating and an image processor. SOLUTION: The projection display, etc., which enlarges and projects a display image outputted by an image display device on a screen through a projection optical system is so constituted that light which is not necessary for the display image is cut off or absorbed by a member different from the member provided with the projection optical system and a temperature rise of the member provided with the projection optical system is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a projection display or a projection type display device and an image processing device.
A projection display or projection display device that enlarges and projects and outputs an image using a reflective imaging device, or a computing device that inputs image information to such a projection display. (Computer).

[0002]

2. Description of the Related Art In recent years, large-screen displays have been used in ordinary homes, and a display having a screen size of 40 inches or more, which is difficult to manufacture with a CRT, has been required in the market. I have. Therefore, a projection display or the like has been used for a screen size of 40 inches or more to meet the needs as described above.

[0003] In such a projection display, conventionally, light separated from light sources such as a high-pressure mercury lamp and a halogen lamp (hereinafter, generally referred to as a light source) into R, G, B and the like is miniaturized such as a liquid crystal panel and a DMD. Of a reflection type image forming apparatus (hereinafter referred to as a reflection type optical system of a reflection type An element is abbreviated and is referred to as an image forming system mirror) or the like, and is enlarged and projected on a screen.

[0004]

In the above-mentioned conventional reflection imaging apparatus for a projection display, a group of the imaging mirrors is provided in one housing in order to prevent an error in the relative position and angle of the imaging mirror. When the DMD is used for the image display device,
Due to the structure of the MD, an image whose luminance is inverted is output in the direction opposite to the display image output for light incident on the DMD from the light source.

However, the inverted image is blocked because it is unnecessary light, but the light of the shielded image is converted into heat energy and the temperature of the housing containing the imaging system mirror is raised. This will cause problems. That is, the housing expands with the rise in temperature, and not only the expansion of the imaging mirror itself, but also the error of the relative position and the angle of the imaging mirror increase. In addition, errors in the position and angle of the image forming system mirror have a great effect of causing distortion and unevenness in the image quality enlarged and projected on the screen. Further, unnecessary light that could not be completely shielded in the housing is diffused into the housing, causing ghosts and causing image deterioration such as affecting contrast.

Accordingly, an object of the present invention is to provide a projection display or a projection display device capable of solving the above problems and preventing image deterioration, and an image processing device.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a projection display or a projection type display device and an image processing device configured as in the following (1) to (16). Things. (1) In a projection display for enlarging and projecting a display image output from an image display device on a screen via a projection optical system, unnecessary light as the display image is separated from a member provided with the projection optical system. A light-shielding or absorbing member configured to suppress a rise in temperature of a member provided with the projection optical system. (2) The projection display according to (1), wherein the image display device is a digital micro device. (3) The projection display according to the above (1) or (2), wherein the unnecessary light as the display image is light emitted from the digital microdevice to a side opposite to the display image. (4) The projection display as described in any one of (1) to (3) above, wherein the projection optical system is a reflection-type imaging device that forms a video system using a reflection-type optical element. (5) A member different from the member provided with the projection optical system is provided so as not to directly contact the member provided with the projection optical system, and is configured to suppress a temperature rise. The projection display according to any one of the above (1) to (4). (6) A member capable of being forcibly cooled is installed on a member different from the member provided with the projection optical system, or the member is connected to a member having a large heat capacity to suppress a rise in temperature. (1) to (4), characterized in that
The projection display according to any one of the above. (7) A member different from the member provided with the projection optical system is provided via a heat insulating material with the member provided with the projection optical system, and is configured to suppress a temperature rise. The projection display according to any one of the above (1) to (4). (8) The member according to any one of (1) to (7), wherein a member different from the member provided with the projection optical system is processed into a color absorbing light such as black. Projection display as described. (9) On the irradiation surface of a member different from the member provided with the projection optical system, light reflected on the light incident on the irradiation surface is reflected by the image display device or the projection optical system. The projection display according to any one of the above (1) to (8), wherein the projection display is arranged at an angle and a position at which the light does not enter the projector. (10) An image processing apparatus comprising: the projection display according to any one of the above (1) to (9); and an arithmetic unit (computer) for inputting image information to the projection display. (11) In a projection type display device that displays an image by enlarging and projecting light from a display device onto a screen via a projection optical system, light unnecessary for displaying the image emitted from the display device is projected. A projection display device, wherein a rise in temperature of the housing is suppressed or reduced by being received by a member different from a housing of the optical system. (12) In a projection display device that displays an image by enlarging and projecting light from a display device onto a screen via a projection optical system, light unnecessary for displaying the image emitted from the display device is projected. A projection type display device characterized in that a rise in temperature of the housing is suppressed or reduced by not directly entering the housing of the optical system. (13) In a projection display device which displays an image by enlarging and projecting light from a display device onto a screen via a projection optical system, the projection type display device displays the image based on light unnecessary for displaying the image. A projection display device comprising means for suppressing or reducing a rise in temperature of a housing of a projection optical system. (14) The display device has a configuration in which a plurality of micromirrors are arranged, and can modulate the traveling direction of the reflected light for each mirror, and only the light reflected in a predetermined range by each mirror is projected. Any one of (11) to (13) above, wherein at least a part of light incident on the optical system and reflected in a direction out of the predetermined range by each mirror enters the member as the unnecessary light. A projection display device according to any one of the above. (15) The above-mentioned members (11) to (1), wherein the member mainly has a light absorbing property and may have a light reflecting property.
The projection display device according to any one of 4). (16) An image processing device comprising: the projection display device according to any one of (11) to (15); and a computer device for inputting image information to the device.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an embodiment of the present invention,
By applying the above configuration, for example, in a projection display using an imaging system using a reflective optical element that is sensitive to the arrangement / angular error of the imaging system mirror and greatly affects the image quality degradation, The influence of expansion due to the temperature of the housing of the reflection imaging device that supports the system mirror can be prevented. As a result, it is possible to reduce the factors for the arrangement / angular error of the imaging system mirror and to prevent image deterioration (distortion / unevenness). Further, as described above, the light reflected on the light incident on the irradiation surface of the member to which the unnecessary light is applied is arranged at an angle and a position where the light is not incident on the image display device or the projection optical system. By doing so, stray light which greatly affects black display in particular is suppressed, and image degradation (contrast reduction, black floating, ghost, etc.) is prevented.

[0009]

Embodiments of the present invention will be described below. [Embodiment 1] Prior to the detailed description of the present invention, an outline of a case where a DMD is used for an image forming mirror and an image display device in a conventional reflection image forming apparatus for a projection display will be described.

FIG. 1 is a schematic view of a conventional reflection imaging apparatus for a projection display using an imaging mirror and a DMD. Light emitted from a light source (1) such as a high-pressure mercury lamp or a halogen lamp is converted into RGB by rotating a disk-type color filter (2).
It is split into (W) and the like. Then, the dispersed light is made uniform by an optical element such as an integrator (3) (the optical path of the made light is shown in (3-1)),
The DMD (4) is irradiated. The optical path of the display image required to be projected on the screen is shown in (4-1), and the optical path of the unnecessary image with inverted luminance is shown in (4-2). DMD
(4) is a group of small reflective optical elements (an array of a plurality of micromirrors), and as shown in FIG. 2, light (4-) required as an image in a direction forming an angle α with respect to incident light.
1), and reflects light (4-2) unnecessary for image display in a direction forming an angle α opposite to the direction of reflection of display image light necessary for incident light. The display image is enlarged and projected on a screen by an imaging system mirror (5.6) as a reflection optical element. (5-1) and (6-1) are respectively
The optical paths emitted from the imaging mirror 1 (5) and the imaging mirror 2 (6) are shown. When the relative distance and angle between the DMD (4) and the imaging mirrors (5.6) deviate from the design values, the displayed image is distorted or uneven. Therefore, D
In order to maintain the position and angle accuracy between the MD (4) and the imaging mirrors (5.6), the housing (7) of the reflection imaging device is housed in one housing as shown in FIG.

However, in the region (7-1) where the unnecessary light is absorbed in the housing (7), the light is converted into heat energy and the temperature rises. Accordingly, as described above, the housing (7) expands in the housing (7) due to a rise in temperature, and not only deforms the fixed imaging system mirrors (5, 6) themselves but also their relative positions. Large position and angle errors and affect the image quality. Therefore, in the projection display (projection display device) of the present embodiment, the reflected light unnecessary for displaying the image from the DMD, which is a display device, is received by a member different from the housing of the projection optical system. The temperature rise of the housing is suppressed or reduced.

FIG. 3 shows a detailed description of the first embodiment of the present invention. 1 to 3, light emitted from a light source (1) is dispersed by a disk type color filter (2) or the like, is uniformed by an integrator (3) or the like, and D
The MD (4) is irradiated. The display image projected on the screen is enlarged and projected by the imaging system mirrors (5.6). In the first embodiment, FIG.
An opening (7-2) is provided so as not to absorb light in the area shown in (1), and a member (8) for blocking and absorbing unnecessary light is provided at a position not in contact with the housing (7) of the reflection imaging apparatus. .

Embodiment 2 FIG. 4 shows a detailed description of Embodiment 2 of the present invention. The basic configuration of the reflection imaging device
The light emitted from the light source (1) is spectrally separated by a disc-type color filter (2) and the like, is made uniform by an integrator (3) and the like.
(4) is irradiated. The display image projected on the screen is enlarged and projected by the imaging system mirrors (5.6). In the second embodiment, the member (8) that blocks and absorbs unnecessary light is disposed via the heat insulating material (9), so that the light in the housing (7) in the region illustrated in FIG. Prevents thermal expansion due to absorption of water.

Third Embodiment FIG. 5 shows a detailed description of a third embodiment of the present invention. The basic configuration of the reflection imaging device is almost the same as that of the first embodiment, and the light emitted from the light source (1) is separated by a disk type color filter (2) and the like, and is made uniform by an integrator (3) and the like. And DMD
(4) is irradiated. The display image projected on the screen is enlarged and projected by the imaging system mirrors (5.6). In the third embodiment, the member (8) that blocks and absorbs unnecessary light is provided with a forced cooling member such as a heat sink or a heat pipe (10) on the outer wall side of the housing (7), and is attached to the main body of the projection display. It is connected to an interposed member having a large heat capacity to prevent thermal expansion due to light absorption in the housing (7).

Embodiment 4 A detailed description of Embodiment 4 of the present invention is shown in FIG. The basic configuration of the basic reflection imaging apparatus is almost the same as that of the first embodiment, and the light emitted from the light source (1) is separated by a disk type color filter (2) and the like, and the integrator (3) and the like. And irradiate the DMD (4). The display image projected on the screen is enlarged and projected by the imaging system mirrors (5.6).

Here, the member (8) for shielding and absorbing unnecessary light in the first to fourth embodiments cannot completely absorb light even if it is painted black, and some reflection is inevitable. However, stray light has a great effect on projection displays, especially when displaying black. Therefore, in the fourth embodiment, the mounting angle of the member (8) that blocks and absorbs unnecessary light in the first to fourth embodiments is set as follows.
The inner wall of the housing (7), the DMD (4) and the imaging mirror (5
(6) It is attached at an angle that does not reflect light to suppress stray light. Here, (8-1) indicates light in which unnecessary light from the DMD (4) is re-reflected by the light-shielding / absorbing member (8). FIG. 6A shows an example in which the angle of the light-shielding / absorbing member (8) is set such that the light from which unnecessary light from the DMD (4) is re-reflected comes to the outside of the housing (7). FIG. 6B shows that, when the arrangement of the light-blocking / absorbing member (8) is, for example, horizontal, the unnecessary light from the DMD (4) is reflected again by the housing (7). An example is shown in which it is installed so as to be on the outside. Although the display device used in the above embodiment is a DMD, various devices having a light deflection function and a light diffraction function can be used in addition to this display device. Further, instead of an imaging system mirror, an imaging system combining an imaging lens and a return mirror can be used as the projection optical system. In this case, the return mirror may be a plane mirror or a curved mirror such as a spherical mirror or an aspherical mirror.

[0017]

As described above, according to the present invention, the optical system in the projection optical system is configured by suppressing or reducing the temperature rise of the housing and members provided with the projection optical system. It is possible to realize a projection display or a projection display device and an image processing device capable of suppressing an error in the relative position or an angle error of the element and preventing image deterioration.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a configuration of a reflection type imaging device in a conventional projection display.

FIG. 2 is a schematic diagram for explaining light entering and exiting a DMD.

FIG. 3 is a side view of the reflection type imaging device in the projection display according to the first embodiment of the present invention.

FIG. 4 is a side view of a reflection type imaging device in a projection display according to a second embodiment of the present invention.

FIG. 5 is a side view of a reflective imaging device in a projection display according to a third embodiment of the present invention.

FIG. 6A is a side view of a reflection type imaging device (an example of a light shielding member, an angled installation) in a projection display according to a fourth embodiment of the present invention. (B) is a side view of a reflection type imaging device (an example of a light shielding member, horizontally installed) in the projection display according to the fourth embodiment of the present invention.

[Explanation of symbols]

1: light source 2: color filter 3: integrator 3-1: optical path of light uniformized by the integrator 4: DMD 4-1: optical path of light reflected as a necessary image from the DMD 4-2: unnecessary image from the DMD 5: imaging mirror 1 5-1: light path reflected from imaging mirror 1 6: imaging mirror 2 6-1: light reflected from imaging mirror 2 7: Housing 7-1: Area where unnecessary light from DMD hits housing (7) 7-2: Opening of housing (7) 8: Member that blocks and absorbs unnecessary light from DMD 8- 1: Light reflected from unnecessary light from DMD 9: Heat insulation material 10: Heat sink

Claims (16)

[Claims] 1. A projection display for enlarging and projecting a display image output from an image display device onto a screen via a projection optical system, comprising: a member provided with a projection optical system; Is a projection display, wherein another member shields or absorbs light to suppress a rise in temperature of a member provided with the projection optical system. 2. The projection display according to claim 1, wherein said image display device is a digital micro device. 3. The projection display according to claim 1, wherein the unnecessary light as the display image is light emitted from the digital micro device to a side opposite to the display image. 4. The projection display according to claim 1, wherein said projection optical system is a reflection type image forming apparatus which forms an image system using a reflection system optical element. 5. A member different from the member provided with the projection optical system is provided so as not to directly contact the member provided with the projection optical system, and is configured to suppress a temperature rise. The projection display according to any one of claims 1 to 4, wherein: 6. A structure in which a member capable of being forcibly cooled is provided on a member different from the member provided with the projection optical system, or the member is connected to a member having a large heat capacity to suppress a rise in temperature. 5. The method according to claim 1, wherein
The projection display according to any one of the above. 7. A member separate from the member provided with the projection optical system is provided via a heat insulating material with the member provided with the projection optical system, and is configured to suppress a rise in temperature. The method according to any one of claims 1 to 4, wherein
Projection display according to the item. 8. The apparatus according to claim 1, wherein a member different from the member provided with said projection optical system is processed to a color absorbing light such as black. The projection display according to 1. 9. An irradiation surface of a member different from a member provided with the projection optical system, wherein light reflected on light incident on the irradiation surface is reflected by the image display device or the projection device. The projection display according to any one of claims 1 to 8, wherein the projection display is arranged at an angle and a position that do not enter the optical system. 10. An image processing apparatus comprising: the projection display according to claim 1; and a computer device for inputting image information to the projection display. 11. A projection display device for displaying an image by enlarging and projecting light from the display device onto a screen via a projection optical system, wherein unnecessary light for displaying the image from the display device is removed. A projection type display device, wherein the projection type display device is received by a member different from a housing of the projection optical system. 12. A projection display device for displaying an image by enlarging and projecting light from a display device onto a screen via a projection optical system, wherein unnecessary light for displaying the image from the display device is removed. A projection display device, wherein the light is not directly incident on a housing of the projection optical system. 13. A projection display device for displaying an image by enlarging and projecting light from a display device onto a screen via a projection optical system, wherein the display device emits light unnecessary for display of the image. A projection type display device comprising means for suppressing or reducing a rise in temperature of the housing of the projection optical system based on the above. 14. The display device has a configuration in which a plurality of micromirrors are arranged, and the traveling direction of reflected light can be modulated for each mirror, and only the light reflected in a predetermined range by each mirror is reflected. 14. The light source according to claim 11, wherein at least a part of light incident on the projection optical system and reflected by the respective mirrors in a direction out of the predetermined range is incident on the member as the unnecessary light. Item 2. The projection display device according to item 1. 15. The projection type display device according to claim 11, wherein said member has a light absorbing property and / or a light reflecting property. 16. An image processing apparatus comprising: the projection type display device according to claim 11; and a computer device for inputting image information to the projection type display device.