JP2001228535A - Projection display device - Google Patents

Abstract

(57) [Summary] [Problem] To provide a compact and compact projection display device with high luminance. A color filter that converts white light incident from a light source side into red light, green light, and blue light in a time-division manner is disposed at an angle to the optical axis of the light source, and transmits light and reflected light of the color filter. An image is displayed by being incident on the image display panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-luminance, compact, and effective use of light of a projection type color display device.

[0002]

2. Description of the Related Art As a conventional projection type color display device,
For example, JP-A-3-163985 and JP-A-7-3
There is a technique disclosed in Japanese Patent No. 33574.

The above-mentioned projection type color display device uses a monochrome transmissive liquid crystal display panel as an image display panel, and irradiates the display panel with white light from a light source through a rotating color wheel. Thereby, a red image, a green image, and a blue image can be projected on the screen in a time-division manner, and as a result, a color projected display image is obtained.

Both the technology disclosed in JP-A-3-163985 and the technology disclosed in JP-A-7-333574 are single-panel display panels used for color projection display devices. This configuration is effective for downsizing the device. Further, since one dot of the display panel is one pixel, it is easier to obtain a high-brightness and high-resolution image than when a display panel in which red, green, and blue color filters are formed for each dot of the display panel is used. .

[0005]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 3-163 is disclosed.
According to the configurations disclosed in Japanese Patent Application Laid-Open No. 985/1995 and Japanese Patent Application Laid-Open No. Hei 7-333574, it is easier to obtain a high-brightness and high-resolution image than the configuration of a projection display device using a color dot forming display panel. And the light source are almost opposite, that is, the center optical axis of the wheel is substantially parallel to the light source optical axis, so that the reflected light from the color wheel returns to the light source direction. That is, the light transmitted through the color wheel and used for image display is red light, green light, or blue light of white light, and other color light components separated from white light, that is, (green light + blue light) components. , (Red light + blue light)
The component, the (red light + green light) component, returns to the light source direction, and as a result, the temperature of the light source increases, thereby shortening the life of the light source.

[0006] Further, the fact that one of the separated lights (reflected light) in the color wheel is not used has been a problem to be improved from the viewpoint of improving the light use efficiency and further increasing the luminance of the projection display device.

An object of the present invention is to solve the above-mentioned problem described in Japanese Patent Laid-Open No. 3-163.
985 and Japanese Patent Application Laid-Open No. Hei 7-333574, cannot be achieved, that is, the life of the light source is hardly deteriorated, and the light use efficiency can be further improved. An object of the present invention is to provide a projection type color display device capable of further increasing luminance.

[0008]

In order to achieve the above object, the present invention takes up a rotating color wheel filter as one of the time-division color filters. The rotation center axis is arranged to be inclined with respect to the optical axis of the light source, and either or both of the transmitted light and the reflected light of the color filter are made incident on the display panel.

Further, in addition to the above configuration, when white light from a light source is incident on the rotating color wheel filter, transmitted light which is separated by the color filter of the color wheel,
Either one of the reflected lights is used for image projection and the other is used effectively for illumination, power generation, or the like, or both lights are used for image display and image projection. That is, in addition to the first display panel using one transmitted light or reflected light of the color filter, a second display panel using the other reflected light or transmitted light of the color filter is also provided. It was designed to be usable. Alternatively, one of the lights separated by the color filter is used for illumination or power generation so that the light emitted from the light source can be effectively used.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a first embodiment of a projection display apparatus according to the present invention.
It is a schematic structure figure of an embodiment. In the figure, 1 is a transmissive liquid crystal display panel, 2 is a light source for emitting white light 11, 3
Is a rotating color wheel, 4 is a projection lens, 5 is a condenser lens, 6 is an ultraviolet light and infrared light cut filter, 7 is a light source optical axis, and 8 is a screen on which an image is projected. Also, 9
Is a color filter of the rotating color wheel 3, 10 is a rotation axis of the wheel, 12 is transmitted light of the color filter 9 formed on the rotating color wheel 3, 13 is reflected light of the color filter 9, and 14 is the color wheel. Reference numeral 3 denotes a motor for rotating the motor 3 at a constant speed, reference numeral 15 denotes a rotation control unit of the motor 14, and reference numeral 16 denotes a panel drive unit for displaying an image on the transmission type liquid crystal display panel.

In the configuration shown in FIG. 1, the rotating shaft 10 of the rotating color wheel 3 is arranged to be inclined at 45 degrees with respect to the light source optical axis 7. That is, the surface of each color filter 9 formed on the color wheel 3 does not face the light source 2, so that the white light 11 passes through the ultraviolet light, the infrared light cut filter 6, and the condenser lens 5. After entering the color filter 9 of the wheel 3, the light is separated into transmitted monochromatic light 12 and reflected light 13, and the reflected light 13 is reflected in a direction substantially 90 degrees with respect to the light source optical axis 7 and the transmitted monochromatic light 12. I do.

FIG. 2 shows an example of the arrangement of the color filters 9 of the rotating color wheel 3 of FIG. The color filters are arranged in a fan shape on the surface of the color wheel, where red light transmission, green light blue light reflection filter TR, and green light transmission, red light blue light reflection filter TG, and blue light transmission, red light green light are provided. Three types of dichroic color filters of the reflection filter TB are formed approximately every 60 degrees around the central axis. In addition,
It is natural that the occupied angle of each color filter occupying around the central axis may be different for each color in order to achieve an optimum design or the like, or the number of color filters arranged in a fan shape may be changed. .

In FIG. 1, monochromatic light transmitted through a certain color filter 9 enters a transmissive liquid crystal display panel 1, and in synchronism therewith, the liquid crystal display panel 1 is displayed by a panel driving section 16 in accordance with the monochromatic light. I do. In the process of rotating the color wheel 3, for example, when the transmitted monochromatic light is red light, the display image on the liquid crystal display panel 1 also transmits a red image, and when the transmitted monochromatic light is green light, transmits a green light image. When the monochromatic light is blue light, an image for blue light is displayed. The display of the transmitted monochromatic light and the image corresponding thereto is appropriately performed by the panel drive unit 16, the motor rotation control unit 15, the motor 14, and the like upon receiving the video signal. By switching and displaying the display images of red, green, and blue at a speed of 90 Hz or more as described above, it is possible to obtain a color projection image in which flickers are difficult to see.

In the configuration shown in FIG. 1, the reflected light 13 travels in a direction substantially 90 degrees with respect to the light source optical axis 7, and therefore does not return to the light source 2. Therefore, the reflected light 13 does not increase the temperature of the light source, and therefore can contribute to prolonging the life of the light source 2.

FIG. 3 shows a second embodiment of the projection display apparatus according to the present invention.
It is a schematic structure figure of an embodiment. In FIG. 3, portions having basically the same configuration as in FIG. 1 are denoted by the same reference numerals as in FIG. 1.

The main difference between the second embodiment and the first embodiment shown in FIG. 1 is that the rotation axis 10 of the rotating color wheel 3 is not arranged at 45 degrees with respect to the light source optical axis 7 but is arranged at 45 degrees.
This is because the angle θ is set to an angle θ that is less than the angle at which the reflected light 13 of the color filter 9 does not return to the light source 2. When the rotation axis 10 is smaller than the angle θ with respect to the light source optical axis 7, a part of the reflected light 13 returns to the light source 2 and the temperature of the light source 2 rises. Absent.

FIG. 4 shows a third embodiment of the projection display apparatus according to the present invention.
It is a schematic structure figure of an embodiment. In FIG. 4, portions having basically the same configuration as in FIG. 1 are denoted by the same reference numerals as those in FIG. 1.

The main difference between the third embodiment and the first embodiment shown in FIG. 1 is that in the first embodiment in FIG. 1, only the light transmitted through the color filter 9 of the rotating color wheel 3 is used for image display. On the other hand, in the third embodiment, both the monochromatic light 13-1 and the transmitted light 12-1 that are incident on and reflected by the color filter 9 of the rotating color wheel 23 are used for image display. I did it. The monochromatic light 13-1 incident on and reflected by the color filter 9 is incident on a first transmission type liquid crystal display panel 1-1, and a display image of the panel 1-1 is projected on a screen 8 by a projection lens 4-1. You.
The light 12-1 incident on and transmitted through the color filter 9 basically contains two-color light components, but is incident on the color filter 9 of the rotating color wheel 23 again through the visible light reflecting mirror 17, The transmitted light 12-2,
The reflected light 13-2 can be converted to monochromatic light. In the third embodiment shown in FIG. 4, the transmitted light 12-2 is incident on the second transmissive liquid crystal display panel 1-2, and the display image of the panel 1-2 is projected onto the screen 8 by the projection lens 4-2. It is configured to project. The images projected by the projection lenses 4-1 and 4-2 are overlapped with each other so that the transmission type liquid crystal display panel 1
-1, 1-2, and the projection lenses 4-1 and 42 are arranged. As a result, it is possible to achieve about twice as high brightness as the projection image brightness according to the first embodiment of FIG.
In addition, separate images are displayed on each of the transmissive liquid crystal display panels 1-1 and 1-2, and the images are displayed on the projection lenses 4-1 and 4-2.
In the case of -2, the arrangement of the transmissive liquid crystal display panel for projecting to different places on the screen and the position of the projection lens can be adopted.

FIG. 5 shows an embodiment of the arrangement of each color filter in the rotating color wheel 3 applied to the third embodiment of FIG.

Each color filter is arranged in a fan shape, and includes red light reflection, green light blue light transmission filter RR, blue light reflection, green light red light transmission filter RB, green light reflection, red light blue light transmission. Three types of dichroic color filters, filter RG, are formed approximately every 60 degrees around the central axis. Here, as a feature of each color filter arrangement, when white light enters each color filter, the reflected light component becomes monochromatic light, and the transmitted light contains two color components. Transmitted light is visible light reflecting mirror 1
7, each color filter is arranged so that other monochromatic light is separated when re-entering the color filter which is initially symmetric with the color filter which is incident on the rotation center. FIG. 5 shows an example of the green and red light reflection,
Blue light reflection, green light red light transmission filter RB is arranged at the rotational center symmetric position of red light blue light transmitting filter RG, green light reflection, red light reflection at the rotational center symmetric position of red light blue light transmitting filter RG,
A green light / blue light transmitting filter RR is arranged, and a blue light reflecting / green light / blue light transmitting filter RR is arranged at a rotational center symmetric position of a blue light reflecting / red light green light transmitting filter RB. With such a color filter arrangement, two types of monochromatic light can be obtained from two fan-shaped color filters arranged symmetrically with respect to the center of rotation in one disc-shaped color filter, and each monochromatic light is converted into two transmissive liquid crystal displays. Panel 1-1, 1
-2.

Even if the occupied angle of the color filter occupying the rotation center axis is made different for each of the transmission and reflection colors in order to achieve an optimum design, etc., the number of divisions of the color filter arranged in a fan shape is changed. You may.

FIG. 6 shows a fourth embodiment of the projection display apparatus according to the present invention.
It is a schematic structure figure of an embodiment. In FIG. 6, portions having basically the same configuration as in FIG. 4 are denoted by the same reference numerals as those in FIG. 4. The main difference between the fourth embodiment and the third embodiment shown in FIG. 4 is that the display images of the two transmissive liquid crystal display panels 1-1 and 1-2 are synthesized by the prism 25,
The configuration is such that the projection is performed by one projection lens 4.

In this configuration, the color filter transmitted light 1
The optical path is changed only once by the visible light reflecting mirror 18 in order to make 2-2 incident on the transmissive liquid crystal panel 1-2. However, if there is a merit in design or the like, a configuration using two or more visible light reflecting mirrors or the like is adopted. Is also good.

According to the fourth embodiment, one projection lens is used.
With this configuration, the size can be easily reduced, and zoom adjustment and focus adjustment can be easily performed.

FIG. 7 shows a fifth embodiment of the projection display apparatus according to the present invention.
It is a schematic structure figure of an embodiment. In FIG. 7, portions having basically the same configuration as in FIG. 4 are denoted by the same reference numerals as those in FIG. 4.

The main difference between the fifth embodiment and the third embodiment shown in FIG. 4 is that in the third embodiment shown in FIG. 4, a visible light reflecting mirror is used to change the optical path of the color filter transmitted light 12-1. In the fifth embodiment, the reflection mirror 17 is not used, and the second color wheel 23-2 is used. In this configuration, the color filter 9 arrangement shown in FIG. 2 can be considered as an example of the color filter arrangement of the two color wheels 23-1 and 23-2.
The two color wheels 23-1 and 23-2 are configured to rotate in synchronization with each other.
Color filters TR, T formed on the color filters 1, 23-2, respectively.
The positions of G and TB need to be set so as to be different from each other.

FIG. 8 shows a sixth embodiment of the projection display apparatus according to the present invention.
It is a schematic structure figure of an embodiment. In FIG. 8, portions having the same configuration as in FIG. 6 are denoted by the same reference numerals as those in FIG.

The main difference between the sixth embodiment and the fourth embodiment shown in FIG. 6 is that in the fourth embodiment shown in FIG. 6, a visible light reflecting mirror is used for changing the optical path of the light 12-1 transmitted through the color filter. In the sixth embodiment, the reflection mirror 17 is not used, and the second color wheel 23-2 is used. In this configuration, as an example of the color filter arrangement of the two color wheels 23-1 and 23-2, the arrangement of the color filter 9 shown in FIG. 2 is the same as in the fifth embodiment of FIG. Can be considered. The two color wheels 23-1 and 23-2 are configured to rotate in synchronization with each other.
-1, 23-2 formed in each color filter TR, T
The positions of G and TB need to be set so as to be different from each other.

FIG. 9 shows a seventh embodiment of the projection display apparatus according to the present invention.
It is a schematic structure figure of an embodiment. In FIG. 9, portions having basically the same configuration as in FIG. 7 are denoted by the same reference numerals as in FIG. 7. The main difference between the seventh embodiment and the fifth embodiment shown in FIG. 7 is that the fifth embodiment in FIG. 7 uses two transmissive liquid crystal display panels, whereas the fifth embodiment in FIG. In the seventh embodiment, three transmissive liquid crystal display panels are used.

The white light 11 from the light source 2 is applied to the color filters 9-1 and 9-2 of the two color wheels 3-1 and 3-2.
Are separated into three colors of red light, green light, and blue light. Next, the color light is transmitted to the transmission type liquid crystal display panel 1-1,
1-2, 1-3, and the liquid crystal display panel 1-1,
The display images of 1-2 and 1-3 are projected onto the projection lenses 4-1 and 4-
2, 4-3, adjacent positions 8 on the screen 8
-1, 8-2, and 8-3, which is a configuration in which the light use efficiency is improved as compared with the fifth embodiment in FIG. In the configuration of the seventh embodiment, the display images of the three transmissive liquid crystal display panels are projected at different positions on the screen. However, due to a design change, the three display images are displayed on the screen 8. It is also possible to adopt a configuration in which the above is superimposed. At this time, it is possible to obtain a screen three times as bright as the seventh embodiment.

FIG. 10 is a schematic structural view of an eighth embodiment of the projection display apparatus according to the present invention. In FIG. 10, FIG.
Parts having basically the same configuration as those in FIG. 1 are denoted by the same reference numerals as those in FIG. The first embodiment shown in FIG.
The main difference from the embodiment is that a single transmissive liquid crystal display panel is used as an image display panel in the first embodiment of FIG. 1, whereas a reflective liquid crystal display panel is used in the eighth embodiment of the present invention. Is used.

The white light 11 from the light source 2 is split by the color filter 9-3 of the rotating color wheel 33, and the reflected light 13 becomes monochromatic light. The reflected light 13 enters the polarization beam splitter 21 and is split by the polarization splitting surface 22 into a P-wave 41 and an S-wave 42. The P-wave 41 travels straight on the polarization splitting surface, while the S-wave 42 reflects on the polarization splitting surface in a direction at 90 degrees to the incident direction and enters the reflective liquid crystal display panel 20. The S-wave 42 incident on the reflection type liquid crystal display panel 20 is modulated according to the image display content, becomes the emission light 43 from the display panel 20, and re-enters the polarization beam splitter 21. The P-wave component of the re-incident light passes through the polarization splitting surface 22 to become image display light 44, and is projected on the screen 8 by the projection lens 4.

FIG. 11 shows the rotating color wheel 33 of FIG.
3 is an example of a color filter arrangement. The color filters of the rotating color wheel are arranged in a fan shape on a disk.
These are red light reflection, green light blue light transmission filter RR, and three kinds of dichroic color filters of green light reflection, red light blue light transmission filter RG, and blue light reflection, red light green light transmission filter RB. Are formed approximately every 60 degrees around the center axis of rotation.

It is to be noted that even if the occupied angle of each color filter occupying around the central axis is made different for each color in order to achieve an optimum design or the like, each color filter RR, R
The number of G and RB may be changed.

FIG. 12 is a schematic structural view of a ninth embodiment of the projection display apparatus according to the present invention. In FIG. 12, FIG.
Parts having the same configuration as 0 are denoted by the same reference numerals as in FIG.

The main difference between the ninth embodiment and the eighth embodiment shown in FIG. 10 is that the eighth embodiment shown in FIG. 10 uses a single reflective liquid crystal display panel. In the ninth embodiment, two reflective liquid crystal display panels are used. The configuration is such that two polarizing beam splitters 21-1 and 21-2 are used corresponding to the two reflective liquid crystal display panels 20-1 and 20-2. The configuration for dispersing the white light 11 from the light source 2 by the rotating color wheel 23 is substantially the same as the configuration in the third embodiment in FIG. Further, by making a design change to the configuration of the ninth embodiment, two projected images can be overlapped, or a single projection lens system can be used.

FIG. 13 is a schematic structural view of a tenth embodiment of the projection display apparatus according to the present invention. In FIG. 13, portions having basically the same configuration as in FIG. 12 are denoted by the same reference numerals as in FIG. 12.

The main difference between the tenth embodiment and the ninth embodiment shown in FIG. 12 is that the ninth embodiment shown in FIG. 12 uses one rotating color wheel 23, In the tenth embodiment, two rotating color wheels 23-1 and 23-2 are used.
The arrangement of each color filter in the color wheels 23-1 and 23-2 and the operation of the color wheels 23-1 and 23-2 are almost the same as in the fifth embodiment shown in FIG. In the configuration of the tenth embodiment, the arrangement of the liquid crystal display panels 20-1 and 20-2, the projection lenses 40-1 and
The two projected images can be superimposed by making a design change to the arrangement of 0-2 and the like.

FIG. 14 is a schematic structural view of an eleventh embodiment of the projection display apparatus according to the present invention. In FIG. 14, portions having basically the same configuration as in FIG. 13 are denoted by the same reference numerals as those in FIG. 13. The main difference between the eleventh embodiment and the tenth embodiment shown in FIG. 13 is that the tenth embodiment shown in FIG. 13 uses two projection lenses, whereas the eleventh embodiment has a configuration using two projection lenses. Now, the fourth embodiment of FIG.
As in the case of the sixth embodiment shown in FIG. 8, two display images are combined by the prism 25, and the combined image is projected by one projection lens. According to the eleventh embodiment, the use of one projection lens facilitates downsizing as compared to the configuration of the tenth embodiment in FIG. 13, and also facilitates zoom adjustment and focus adjustment.

FIG. 15 is a schematic structural view of a twelfth embodiment of the projection display apparatus according to the present invention. In FIG. 15, portions having basically the same configuration as in FIG. 14 are denoted by the same reference numerals as those in FIG. 14. The main difference between the twelfth embodiment and the eleventh embodiment shown in FIG. 14 is that the reflective liquid crystal display panels 20-1 and 20-2 are used for the image display panel in the eleventh embodiment shown in FIG. In contrast to the configuration, the twelfth embodiment is configured to use the reflective image display panels 30-1 and 30-2 as the image display panels. As a specific configuration example of the reflection type image display panels 30-1 and 30-2, there is a configuration in which a micromirror (not shown) is formed and arranged on an image display surface, and it is used as a pixel. Each micromirror of each of the panels 30-1 and 30-2 changes the reflection angle of light in accordance with a video signal. The reflected light from the micromirror is taken into the entrance pupil of the projection lens 4, and when the light exits from the projection lens 4, the display mode is white display.
When the light does not enter the entrance pupil, a black display mode is set, and an image can be displayed.

FIG. 16 is a schematic structural view of a thirteenth embodiment of the projection display apparatus according to the present invention. In FIG. 16, portions having basically the same configuration as in FIG. 3 are denoted by the same reference numerals as those in FIG. 3. The main difference between the thirteenth embodiment and the second embodiment shown in FIG. 3 is that the second embodiment in FIG. In the thirteenth embodiment, the configuration is such that the reflected light 13 is guided to the light guide optical system 41, further incident on a flexible light guide 44, and guided outside the projection optical system to obtain illumination light 45. With this configuration, it is possible to easily perform various operations such as document investigation and text creation around the projection display device.

FIG. 17 is a schematic external view of a thirteenth embodiment of the projection display apparatus according to the present invention. In FIG. 17, a flexible light guide 44 is provided in a light emission port 46 on the side surface of the display device 50, and a light emission part 48 for illumination is formed at the tip of the light guide 44. With this configuration,
The operation of the device adjustment button 49 and the work around the device are facilitated without turning on the lighting of the device installation location.

FIG. 18 is a schematic structural diagram of a fourteenth embodiment of the projection display apparatus according to the present invention. In FIG. 18, portions having basically the same configuration as in FIG. 16 are denoted by the same reference numerals as those in FIG. 16. The main difference between the fourteenth embodiment and the thirteenth embodiment shown in FIG. 16 is that, in the thirteenth embodiment of FIG. 16, the color filter reflected light 13 of the color filter 9 is guided to the light guide optical system 41 and the like. In contrast to the configuration in which the illumination light 45 is obtained, in the configuration of the fourteenth embodiment, after the reflected light 13 is guided to the light guide optical system 42, the reflected light 13 is further guided to a light-receiving power generation panel (such as a solar cell) 51 for light. It is configured to generate power and store the generated power in the storage battery 52. The storage battery 52 can be attached and detached so that the charged battery can be removed and used as a power source for OA equipment, portable equipment, automobile equipment, home electric appliances, and the like.

FIG. 19 is a schematic structural diagram of a fifteenth embodiment of the projection display apparatus according to the present invention. In FIG. 19, portions having basically the same configuration as in FIG. 18 are denoted by the same reference numerals as those in FIG. The main difference between the fifteenth embodiment and the fourteenth embodiment shown in FIG. 18 is that, in the fourteenth embodiment of FIG. 18, the light receiving / generating panel 51 has a small light receiving area. In the configuration of the embodiment, it is assumed that the amount of the reflected light 13 is larger than that of the fourteenth embodiment, and the power generation panel 53 is a panel having a large light receiving area. Here, in order to make the reflected light 13 uniformly incident on the entire surface of the light receiving and generating panel 53, the light guide optical system 43 is used.
And the light is made incident on the power generation panel 53. In order to improve the power generation efficiency of the light-receiving power generation panel, it is necessary to make the panel light-receiving surface size commensurate with the amount of received light.

FIG. 20 is a schematic diagram showing a sixteenth embodiment of the projection display apparatus according to the present invention. 20, portions having basically the same configuration as in FIG. 1 are denoted by the same reference numerals as those in FIG. The main difference between the sixteenth embodiment and the first embodiment shown in FIG. 1 is that the first embodiment shown in FIG. The configuration of the sixteenth embodiment is a projection type display device that projects onto the rear screen 59, uses the reflected light 13 of the color filter 9 as image projection light,
The color filter 9 transmits the transmitted light 12 to the outside of the display device,
The configuration is such that the periphery of the device is brightened. The transmitted light 12 diffuses and transmits through a light diffusion transmission plate 55 provided at the lower part of the set, and the diffused light 56 diffuses and illuminates a floor surface 57.
By using an appropriate light guide, the transmitted light 1
2 can be used to illuminate the ceiling.
7. It is also possible to adopt a configuration in which both the ceiling and the ceiling are illuminated.

As described above, a dichroic color filter formed in a disk shape has been described as a time-division color filter for dispersing white light into color light. Even when applying the time division control of the diffraction type color filter such as the use of the diffraction grating and the liquid crystal panel, the time division control of the prism spectral type color filter, the time division control of the hologram type color filter, etc. Is also good. In the above description, the case where one image display panel is used and the case where two images are used are mainly described. However, the image display panel may be a transmissive liquid crystal display panel or a reflective liquid crystal display panel. In any case, a reflection type image display panel having a micromirror formed on a display surface can constitute a three-panel projection type display device. Also,
When the image display panel is a liquid crystal display panel, if a polarization conversion and polarization reuse system is applied, a projection display device that can achieve higher luminance can be obtained.

[0048]

As described above, according to the present invention, a projection type color display device can be constructed using a monochrome single-panel liquid crystal display panel having no microlenses or color filters. In addition, since the time-division color filter used in the configuration at this time is disposed at an angle with respect to the optical axis of the light source, one of the separated lights that are not used after being separated by the color filter returns to the light source. Therefore, the life of the light source can be extended.
Furthermore, after spectral separation by the color filter, one of the light which has not been conventionally used is re-incident on the time-division color filter and re-spectralized, or two time-division color filters are used. Effective use of light can be achieved by using two or three sheets, etc.
Using the same light source, the conventional projection type color display device has a luminance of 2
It is possible to obtain a projection type color display device capable of increasing brightness twice or three times.

After spectral separation by the color filter, one of the light, which has not been conventionally used, is guided to a light guide, a light-receiving power generation panel, etc., so that it can be used for illumination, power generation, and the like.
Effective use of light can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment of a projection display device of the present invention.

FIG. 2 is an explanatory diagram of a color filter arrangement in a rotating color wheel applied to the first embodiment of the projection display device of the present invention.

FIG. 3 is a schematic configuration diagram of a second embodiment of the projection display apparatus of the present invention.

FIG. 4 is a schematic configuration diagram of a third embodiment of the projection display apparatus of the present invention.

FIG. 5 is an explanatory diagram of a color filter arrangement in a rotating color wheel applied to a third embodiment of the projection display apparatus of the present invention.

FIG. 6 is a schematic configuration diagram of a fourth embodiment of a projection display device of the present invention.

FIG. 7 is a schematic configuration diagram of a fifth embodiment of a projection display apparatus according to the present invention.

FIG. 8 is a schematic configuration diagram of a sixth embodiment of the projection display apparatus of the present invention.

FIG. 9 is a schematic configuration diagram of a seventh embodiment of a projection display apparatus of the present invention.

FIG. 10 is a schematic configuration diagram of an eighth embodiment of the projection display device of the present invention.

FIG. 11 is an explanatory diagram of a color filter arrangement in a rotating color wheel applied to an eighth embodiment of the projection display apparatus of the present invention.

FIG. 12 is a schematic configuration diagram of a ninth embodiment of the projection display apparatus of the present invention.

FIG. 13 is a schematic configuration diagram of a tenth embodiment of the projection display apparatus of the present invention.

FIG. 14 is a schematic configuration diagram of an eleventh embodiment of the projection display apparatus of the present invention.

FIG. 15 is a schematic structural view of a twelfth embodiment of the projection display apparatus of the present invention.

FIG. 16 is a schematic configuration diagram of a thirteenth embodiment of the projection display apparatus of the present invention.

FIG. 17 is a schematic external view of a thirteenth embodiment of the projection display apparatus of the present invention.

FIG. 18 is a schematic configuration diagram of a fourteenth embodiment of the projection display apparatus of the present invention.

FIG. 19 is a schematic configuration diagram of a fifteenth embodiment of the projection display apparatus of the present invention.

FIG. 20 is a schematic configuration diagram of a sixteenth embodiment of the projection display device of the present invention.

[Explanation of symbols]

1, 1-1, 1-2, 1-3: transmissive liquid crystal display panel, 2: light source, 3, 3-1, 3-2, 23, 23-1, 23-2, 33
... Rotating color wheel, 4,4-1,4-2,4-3 ... Projection lens, 5 ... Condensing lens, 6 ... Infrared light and ultraviolet light cut filter, 7,7-1,7-2 ... Light source Optical axis, 8, 8-1, 8-2, 8-3 ... screen, 9, 9-1, 9-2, 9-3, TR, TG, TB, R
R, RG, RB: Color filter, 10: Color wheel rotation axis, 11: White light, 12, 12-1, 12-2: Color filter transmitted light, 13, 13-1, 13-2: Color filter reflected light , 14 ... motor, 15 ... rotation control unit, 16 ... panel drive unit, 17, 18, 19, 22-1, 22-2, 22-3, 2
2-4, 22-5, 22-6, 22-7, 22-8, 2
2-9: visible light reflecting mirror, 20, 20-1, 20-2: reflective liquid crystal display panel, 21, 21-1, 21-2: polarizing beam splitter, 24-1, 24-2, 24-3 Reference numeral 24-4: Irradiation beam adjusting lens 25: Prism 21: Panel incident light 30-1, 30-2: Reflection type image display panel 41, 42, 43: Light guide optical system, 44: Light guide 45, irradiation light, 51, 53: light receiving and generating panel, 52, 54: storage battery, 55: light diffusion transmission plate, 56: diffused light, 57: floor surface, 59: rear screen.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02F 1/1335 505 G02F 1/1335 505 F-term (Reference) 2H048 AA01 AA12 AA19 AA24 AA26 2H088 EA13 HA07 HA12 HA24 HA28 MA06 MA20 2H091 FA02Z FA23Z FA26X FA26Z FA41Z FD26 GA12 LA11 LA16 MA07

Claims (8)

[Claims] A light source, a color filter for converting white light incident from the light source side into red light, green light, and blue light by time division;
An image display panel to which the red light, the green light, and the blue light are irradiated; and a projection display device including a projection lens for enlarging and projecting a display image of the image display panel. A projection type display device characterized by being inclined. 2. A light source, a color filter for converting white light incident from the light source side into red light, green light, and blue light by time division, an image display panel irradiated with the red light, green light, and blue light; In a projection display device provided with a projection lens for enlarging and projecting a display image of the image display panel, the color filter is arranged to be inclined with respect to an optical axis of a light source, and transmitted light or reflected light of the color filter is incident. And a second image display panel on which reflected light or transmitted light of the color filter is incident. 3. A light source, a color filter for converting white light incident from the light source side to red light, green light, and blue light by time division, an image display panel irradiated with the red light, green light, and blue light; In a projection display device including a projection lens for enlarging and projecting a display image of the image display panel, the color filter is arranged to be inclined with respect to an optical axis of a light source, and one of the transmitted lights separated by the color filter Alternatively, a projection display device comprising: an image display panel on which reflected light is incident; and a light guide optical system for guiding the other reflected light or transmitted light separated by the color filter to outside the image display optical system. . 4. The projection type liquid crystal display device according to claim 1, wherein a rotating color wheel color filter is applied as said color filter. 5. The projection according to claim 1, wherein a transmission type liquid crystal panel, a reflection type liquid crystal panel, or a reflection type display panel is applied as said image display panel. Liquid crystal display device. 6. A structure according to claim 3, further comprising a light guide for receiving light from said light guiding optical system and guiding said light to an arbitrary place. Projection display device. 7. A light receiving and generating panel which receives light from said light guiding optical system and generates electric power.
6. The projection display device according to 4 or 5. 8. The method according to claim 1, wherein the color filter is arranged at approximately 45 degrees with respect to the optical axis of the light source.
The projection display device according to claim 1, wherein the projection display device is configured to be inclined at an angle.