JP3596357B2 - Projection image display device with two light sources suitable for time-division driving - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a projection-type image display device that performs time-division driving in which one light valve is driven according to temporally different color light signals.
[0002]
[Prior art]
Currently, the large-sized video market, mainly for presentations, is rapidly expanding. This market varies from mobile to ultra-large screens used in halls and the like, but what is commonly required in each field is higher brightness, lower cost, and smaller size. There are a three-panel projection image display apparatus having a light valve for each of RGB and a single-panel type which performs color display with one light valve. Therefore, devices using the latter method are increasing.
[0003]
This single-plate system can also be broadly classified into two systems. One is to use a light valve with pixels corresponding to each color of RGB. One is a method that uses a light valve that switches the modulation degree temporally according to each of the RGB signals and displays the same pixel.
In the former case, the structure can be simplified, but strictly speaking, the projected image is displayed with RGB shifted, resulting in inferior image quality. The latter can achieve good image quality without any RGB shift, but the configuration is more complicated than the former.
[0004]
The present invention is intended to improve the latter, and the latter time-divisionally driven single-panel image display device will be described below. The light valve is driven at three times the speed of the conventional drive according to the input signal, but the light incident on the light valve needs to be switched accordingly. For this switching, a disk as disclosed in Japanese Patent Application Laid-Open No. 2-119005 shown in FIG. 7 is constituted by a filter capable of selecting the color of the light transmitted in the angular direction, and this light is rotated to select the light incident on the filter. This is possible with a configuration that captures the post-emission light into the light guide.
[0005]
Speaking of application to a projection type image display device, a configuration as shown in Japanese Patent Application Laid-Open No. 9-185902 shown in FIG. 8 is adopted. As here, the light from the light source is configured to converge on or near the rotating color wheel. This is attributable to the necessity of making the rotating color wheel small and the necessity of minimizing the period during which adjacent color selection filters mix colors.
[0006]
[Problems to be solved by the invention]
As described above, when the rotating color wheel is used in the time-division driving, it is desirable that the image of the light source condensed and formed on or near the color selection filter of the rotating color wheel is smaller. On the other hand, when time-division driving is performed, the light output of the device is basically reduced to 1/3, so that the use of a high-luminance light source is required. However, in general, the light source used in the projection type image display device is a discharge tube, and the distance between the electrodes is large and the luminous body becomes large in order to increase the luminance and achieve a practical life. When such a high-luminance light source having a large luminous body is used, the size of the image of the light source condensed and formed on or near the color selection filter of the rotating color wheel described above becomes large, and the rotating color wheel Of the image, and image deterioration due to color mixture of the projected image.
[0007]
Therefore, it has been difficult to achieve high luminance in a projection-type image display apparatus that performs time-division driving using a conventional rotating color wheel.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a projection display according to the present invention includes a light source, a light-condensing device that arranges the light source at approximately one focal position, and condenses light from the light source at the other focal position, and an incident light. -Division color separation optical system that switches and emits light as first color light, second color light, or third color light in time, a light valve that can independently modulate incident light for each pixel, and time division An illumination optical system for guiding light from the color separation optical system onto the light valve, and a projection optical system for enlarging and projecting pixels on the light valve,
The light source And said Two light concentrators Without Are provided, The two light sources and the two light collectors receive light from the same surface side of the time-division color separation optical system, and On the side different from the light source side of the light collector each Focus position But It is characterized by being arranged so as to overlap on or near the time-division color separation optical system.
[0009]
Here, the light-collecting device is characterized by being a reflector having an elliptical reflection surface, or a reflector having a parabolic reflection surface, and comprising an optical component having a convex lens effect. Be composed.
[0010]
The illumination optical system includes a lens that converts light from the time-division color separation optical system into substantially parallel light, a first lens array that splits incident light into partial light to form a secondary light source image, An integrator optical system including a second lens array in which a plurality of microlenses are arranged at the next light source image forming position can be configured.
[0011]
The light valve is a reflection type light valve, and the shape of an exit pupil formed in the illumination optical system, which can be regarded as a light emitting surface when the illumination optical system is viewed from the light valve, is a light incident on the reflection type light valve. The axis and the dimension in the direction corresponding to the plane direction including the reflection optical axis of the reflection type light valve have a short shape. Further, of the illumination F number to the reflection type light valve, the incidence of the reflection type light valve, the reflection optical axis F1 is a direction corresponding to the plane direction including the light, and F2 is an illumination F number in a direction perpendicular to the direction. An angle formed by light incident on the reflective light valve and light reflected by the reflective light valve and incident on the projection optical system. Is defined as θ1, the following relationship is established.
[0012]
F1> 1 / (2 sin (θ1 / 2)), F2 <1 / (2 sin (θ1 / 2))
The reflective light valve has a polarizer on the optical axis on the incident side and an analyzer on the output side, and the reflective light valve can independently control the polarization direction of the incident light for each pixel. It is characterized by a reflective liquid crystal light valve, or has a reflective surface that can be controlled independently for each pixel, and controls the tilt angle of the reflective surface to change the emission angle of the emitted light to project light. An image display device that performs image display by selecting light to the optical system can also be configured.
[0013]
The illumination optical system includes a lens that converts light from the time-division color separation optical system into substantially parallel light, a first lens array that splits incident light into partial light to form a secondary light source image, An integrator optical system comprising a second lens array in which a plurality of microlenses are arranged at the next light source image forming position. The overall shape of the second lens array is such that the optical axis incident on the reflective light valve and the reflective light valve The direction corresponding to the plane direction including the reflected optical axis is short.
[0014]
In particular, it can be easily configured by a feature that a system axis and a plane including the two light sources and a plane including the incident and reflected optical axes of the reflection type light valve are orthogonal to each other. Further, the time-division color separation optical system is provided with a light-selecting means for emitting incident white light as first color light, second color light or third color light in the angular direction of the rotating body. It is configured to be a wheel.
[0015]
Between the light-collecting devices and the time-division color separation optical system, the light beams closest to each other among the light collected from the two light-collection devices on or near the time-division color separation optical system coincide. It is more preferable that the optical means be capable of changing the optical path in the direction.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
ADVANTAGE OF THE INVENTION According to this invention, in the projection type image display apparatus which performs a time-sharing drive using a rotating color wheel by arranging two light sources appropriately, the light source image formed on the rotating color wheel or its vicinity is minimized. Since the light from the light source can be doubled while holding down, high brightness of the projected image is realized.
[0017]
(Embodiment 1)
FIG. 1 is a schematic configuration diagram of the first embodiment. In the projection type image display apparatus 300 of this example, a first light source 302 on a first lamp optical axis 301 and the first light source 302 as one focal position, and the first lamp optical axis 301 as a rotation target axis. A first elliptical mirror 303 having a basic reflecting surface shape, a second light source 305 on a second lamp optical axis 304, and the second lamp optical axis 304 rotated by using the second light source 305 as one focal position. A second elliptical mirror 306 having a basic reflecting surface shape serving as a target axis is provided. These two elliptical mirrors respectively have a first lamp optical axis 301 and a second lamp light at a focal position different from a light source among two focal points. The axes 304 are configured to intersect. Further, the two elliptical mirrors are adjacent to each other with the system axis 307 interposed therebetween, and are arranged so that the distance between the light beams passing through the outermost sides of the respective elliptical mirrors in the direction approaching each other is minimized.
[0018]
At the intersection of the first lamp optical axis 301 and the second lamp optical axis 304, a color filter unit 309 of a color wheel 308 is arranged as shown in FIG. The color wheel 308 is a disk divided on the circumference into a blue transmission dichroic filter 309a, a green transmission dichroic filter 309b, and a red transmission dichroic filter 309c as shown in FIG. It is rotated.
[0019]
The light from the light sources 302 and 305 transmitted through the color filter unit 309 becomes approximately parallel light through the condenser lenses 311 and 312, then passes through the ultraviolet / infrared ray removing filter 313 and enters the integrator optical system 314. The integrator optical system 314 includes a first lens array 315, a second lens array 316, and a condenser lens 317. The first lens array 315 includes a number of microlenses 319 having an opening shape similar to the shape of an effective portion of a transmission type liquid crystal panel 318 described later.
[0020]
In the first lens array 315, a second lens array 316 is arranged at a second light source position formed for each of the micro lenses 319, and a large number of micro lenses 320 arranged at each light source image position are gathered. It is configured. The microlenses 320 are configured so that the aperture shape of each microlens 319 of the first lens array 315 is enlarged and projected onto the transmission type liquid crystal panel 318, and the image of the microlens 319 of the first lens array 315 is superimposed. To provide uniform illumination. Here, in particular, the outer shape of the second lens array 316 viewed from the transmissive liquid crystal panel 318 is formed by assembling a large number of microlenses 320 substantially symmetrically with respect to the system axis 307 as shown in FIG.
[0021]
Needless to say, each micro lens 319 of the first lens array 315 is set so that the secondary light source image formed by each micro lens 319 is formed on the micro lens 320 on the second lens array 316. Light transmitted through such an integrator optical system 314 is incident on the polarizer 321. Here, the polarized light component in the direction of the absorption axis of the polarizer 321 is absorbed, and only the light of the polarized light component in the direction orthogonal to this is transmitted therethrough and enters the transmissive liquid crystal panel 318.
[0022]
The transmissive liquid crystal panel 318 is composed of a large number of pixels that can be independently modulated by an external input signal. Of the light incident on the transmissive liquid crystal panel 318, the light incident on the pixel portion to be displayed in black is transmitted. Is set to be absorbed by the analyzer 322 because the polarization direction changes by 90 degrees when transmitted and emitted. On the other hand, light incident on the pixel portion to be displayed in white is transmitted through the transmissive liquid crystal panel 318 and does not change its polarization direction when emitted, so that it passes through the analyzer 322 and enters the projection lens 323 as a projection optical system. Thus, the image of the transmissive liquid crystal panel 318 is enlarged and projected on the screen 324.
[0023]
At this time, it goes without saying that the transmission type liquid crystal panel 318 adjusts the drive timing to the color of the transmitted light of the color wheel 308 and the video signal for each of the RGB colors from the outside.
[0024]
In the conventional configuration using only two lamps (eg, JP-A-6-242397 and JP-A-6-265887), the light source image becomes large. However, as in the present embodiment, the two light sources are appropriately arranged and rotated. By superimposing the light source images formed on or near the color wheel, the size of the light source image can be minimized. As a result, the diameter of the rotating color wheel can be minimized, so that the size of the set image can be reduced because the light from the light source can be doubled while reducing the size of the set, reducing the cost, reducing noise and improving reliability during rotation, and preventing color mixing. Brightness can be realized.
[0025]
Here, the light from the light source is condensed by the elliptical mirror, but a configuration in which the light source is placed at the focal position of the parabolic mirror, the light from the light source is emitted as parallel light, and the light is condensed by a convex lens, etc. Equivalent objectives can be achieved.
[0026]
Further, although the integrator means is used here, this is not always necessary when the restriction of cost or the like is prioritized over the image quality, and the concentrator can be constituted only.
[0027]
Although the light valve is a transmissive liquid crystal panel 318 here, the present embodiment is not limited to this, and can be replaced with any image display device that can modulate input light according to an external signal. Needless to say.
[0028]
In the configuration according to the present embodiment, the angle of incidence of light incident on the color wheel is larger than in the single lamp system. If a problem arises in practical use due to the increase of the incident angle, the aperture of the elliptical mirror, which is the light source reflector, is made smaller in the direction in which the light sources become larger adjacent to each other, thereby reducing the incident angle. I can deal with it. The red light can be improved by providing a bandpass filter near the position of the ultraviolet / infrared light removing filter 313 in the present embodiment, which removes only the yellow component.
[0029]
As described above, according to the present embodiment, the light source and the light condensing device (the elliptical mirror 303) which arranges the light source at approximately one focal position and condenses the light from the light source (302, 305) at the other focal position. , 306), a time-division color separation optical system (color wheel 308) that switches and emits the incident light temporally as the first color light, the second color light, or the third color light, and the incident light for each pixel. A light valve (transmissive liquid crystal panel 318) that can be modulated independently, an illumination optical system (condenser lenses 311, 312, and an integrator optical system 314) that guides light from a time-division color separation optical system onto the light valve; In a configuration including a projection optical system (projection lens 323) for enlarging and projecting a pixel on the light valve, two light sources and two light collecting devices are provided, each of which is different from the light source side of the light collecting device. Are arranged so as to coincide with each other on or near the time-division color separation optical system, and each light-collecting device is optically close to each other. It is possible to provide a projection type image display device having the same.
[0030]
Here, it is most desirable that the focal points of the two light-collecting devices on the side different from the light source side be superimposed on the time-division color separation optical system (color wheel 308), but the relationship between the size of the color wheel and the size of the light source image If permitted, the position where the focal point overlaps in the direction of the optical axis (system optical axis 307) can be moved back and forth to some extent. In the case where the elliptical mirrors, which are the respective condensing devices, cannot be arranged close to each other as shown in FIG. 1 due to mechanical and reliability restrictions, a folding mirror is arranged on the entrance side of the time-division color separation optical system (color wheel 308). While maintaining a mechanical distance with general optical means such as disposing a prism for optical path conversion and the like, while optically viewing two from the time-division color separation optical system (color wheel 308). It is possible to minimize the ineffective area of the light from the light collector.
[0031]
(Embodiment 2)
FIG. 4 is a top view of a schematic configuration diagram of the second embodiment, and FIG. 5 is a side view of the schematic configuration diagram of the second embodiment (however, from a light source to a light valve). The projection type image display device 400 of the present example has a first light source 402 on a first lamp optical axis 401, the first light source 402 as one focal position, and the first lamp optical axis 401 as a rotation target axis. The first elliptical mirror 403 having a basic reflecting surface shape, the second light source 405 on the second lamp optical axis 404, and the second lamp optical axis 404 rotating with the second light source 405 as one focal position. A second elliptical mirror 406 having a basic reflecting surface shape serving as a target axis is provided. The two elliptical mirrors have a first lamp optical axis 401 and a second lamp light at a focal position different from the light source among the two focal points. The axes 404 are configured to intersect. Further, the two elliptical mirrors are adjacent to each other with the system axis 407 interposed therebetween, and are arranged so that the distance between the light beams passing the outermost in the direction in which the elliptical mirrors approach each other is minimized.
[0032]
At the intersection of the first lamp optical axis 401 and the second lamp optical axis 404, a color filter section 409 of a color wheel 408 is arranged as shown in FIGS. As shown in FIG. 2, the color wheel 408 is a disk divided on the circumference into a blue transmission dichroic filter 409a, a green transmission dichroic filter 409b, and a red transmission dichroic filter 409c. It is rotated.
[0033]
The light from the light sources 402 and 405 transmitted through the color filter unit 409 becomes approximately parallel light through the condenser lenses 411 and 412, and then passes through the ultraviolet / infrared removal filter 413 and enters the integrator optical system 414. The integrator optical system 414 includes a first lens array 415, a second lens array 416, and a condenser lens 417. The first lens array 415 includes a plurality of microlenses 419 having an opening shape similar to the shape of an effective portion of a reflective liquid crystal panel 418 described later.
[0034]
In the first lens array 415, a second lens array 416 is arranged at a second light source position formed for each of the micro lenses 419, and a large number of micro lenses 420 arranged at each light source image position are gathered. It is configured. The microlenses 420 are configured so that the aperture shape of each microlens 419 of the first lens array 415 is enlarged and projected onto the reflective liquid crystal panel 418, and the image of the microlenses 419 of the first lens array 415 is superimposed. To provide uniform illumination. Here, in particular, the outer shape of the second lens array 416 viewed from the reflection type liquid crystal panel 418 is formed by assembling a large number of microlenses 420 with the height restricted in one direction as shown in FIG.
[0035]
Needless to say, each micro lens 419 of the first lens array 415 is set so that the secondary light source image formed by each micro lens 419 is formed on the micro lens 420 on the second lens array 416. The direction in which the outer height of the second lens array 416 is regulated coincides with the direction corresponding to the plane direction including the optical axis incident on the effective portion of the reflective liquid crystal panel 418 and the reflected optical axis. The light transmitted through such an integrator optical system 414 enters the polarizer 421. Here, the polarized light component in the direction of the absorption axis of the polarizer 421 is absorbed, and only the light of the polarized light component in the direction orthogonal to this is transmitted therethrough and enters the reflective liquid crystal panel 418. The reflective liquid crystal panel 418 is composed of a large number of pixels that can be independently modulated by an external input signal. Of the light incident on the reflective liquid crystal panel 418, the light incident on the pixel portion to be displayed in black is reflected on the reflective liquid crystal panel. The light is reflected at 418, and the direction of polarization is changed by 90 degrees when emitted, so that the light is absorbed by the analyzer 422.
[0036]
On the other hand, light that enters the pixel portion to be displayed in white is reflected by the reflective liquid crystal panel 418 and the polarization direction does not change when the light is emitted, so that the light passes through the analyzer 422 and enters the reflective liquid crystal panel 418. Then, the light is emitted on an optical axis having an angle of θ1 and enters a projection lens 423 serving as a projection optical system, so that an image of the reflective liquid crystal panel 418 is enlarged and projected on a screen 424.
[0037]
At this time, since the center of the reflection type liquid crystal panel 418 and the center of the projection lens 423 are shifted, the projection is performed with the axis shifted in the direction opposite to the direction of the reflection type liquid crystal panel 418 viewed from the projection lens 423. Here, as shown in FIG. 6, of the illumination F number for the reflection type liquid crystal panel 418, the direction corresponding to the plane direction including the optical axis incident on the effective portion of the reflection type liquid crystal panel 418 and the reflection optical axis is represented by F1. The shape of the second lens array 416 is set so that the illumination F number in the orthogonal direction is F2, and the light incident on the reflective liquid crystal panel 418 and reflected by the reflective light valve are incident on the projection optical system. The following relationship is established when the angle formed by the emitted light is θ1.
[0038]
F1> 1 / (2 sin (θ1 / 2)), F2 <1 / (2 sin (θ1 / 2))
At this time, it is needless to say that the drive timing of the reflective liquid crystal panel 418 is adjusted to the color of the transmitted light of the color wheel 408 and the external video signal for each of the RGB colors.
[0039]
As in the first embodiment, a conventional light source having only two lamps (for example, JP-A-6-242397 and JP-A-6-265887) has a large light source image. However, as in the present embodiment, two light sources are used. Are appropriately arranged, and the size of the light source image can be minimized by superimposing the light source images formed on or near the rotating color wheel. As a result, the diameter of the rotating color wheel can be minimized, so that the size of the set image can be reduced because the light from the light source can be doubled while reducing the size of the set, reducing the cost, reducing noise and improving reliability during rotation, and preventing color mixing. Brightness can be realized.
[0040]
Here, the light from the light source is condensed by the elliptical mirror, but a configuration in which the light source is placed at the focal position of the parabolic mirror, the light from the light source is emitted as parallel light, and the light is condensed by a convex lens, etc. Equivalent objectives can be achieved.
[0041]
Further, although the integrator means is used here, this is not always necessary when the restriction of cost or the like is prioritized over the image quality, and the concentrator can be constituted only.
[0042]
Although the reflection type liquid crystal panel 418 is used as the light valve here, the present embodiment is not limited to this. Any image display device that can modulate input light according to an external signal can be used. Needless to say.
[0043]
Instead of the reflective liquid crystal panel 418, a small mirror array device described in SID “ASIA DISPLAY '95” pages 95 to 98 can be used. In this case, the angle θ1 between the incident light and the reflected light is incident. It is apparent that the present invention can be applied as it is if it is set as the angle formed by the light incident on the projection optical system as the projection image out of the light and the reflected light.
[0044]
It should be noted that although the illumination efficiency is slightly lowered, it is easily imaginable to those skilled in the art that the same concept can be applied even if the integrator optical system is configured by a condenser lens and a special aperture stop.
[0045]
Also in the second embodiment, the incident angle of light incident on the color wheel is larger than in the single lamp system. If a problem arises in practical use due to the increase of the incident angle, the aperture of the elliptical mirror, which is the light source reflector, is made smaller in the direction in which the light sources become larger adjacent to each other, thereby reducing the incident angle. I can deal with it. In addition, red light can be improved by providing a bandpass filter near the position of the ultraviolet / infrared light removing filter 413 in the present embodiment for removing only the yellow component.
[0046]
As described above, according to the present embodiment as well, the light source and the light condensing device (the elliptical mirror 403 and the elliptical mirror 403) that arrange the light source at approximately one focal position and condense the light from the light source (402, 405) at the other focal position. 406), a time-division color separation optical system (color wheel 408) that switches and emits the incident light temporally as the first color light, the second color light, or the third color light, and the incident light independently for each pixel. A light valve (reflection type liquid crystal panel 418) that can be modulated by light, an illumination optical system (condenser lenses 411 and 412, an integrator optical system 414) for guiding light from a time-division color separation optical system onto the light valve, and the light In a configuration including a projection optical system (projection lens 423) for enlarging and projecting a pixel on the bulb, two light sources and two light condensing devices are provided, each of which is different from the light source side of the light condensing device. The focal position on the side is arranged so as to coincide on or near the time-division color separation optical system, and each light condensing device is optically close to each other, and is characterized by high brightness, low cost, and miniaturization. Can be provided.
[0047]
Here, it is most desirable on the time-division color separation optical system (color wheel 408) that the focal points of the two light-collecting devices on the side different from the light source side are superimposed, but the relationship between the size of the color wheel and the size of the light source image If permitted, the position where the focal point is superimposed in the direction of the optical axis (system optical axis 407) can be moved back and forth to some extent. In the case where the elliptical mirrors, which are the respective condensing devices, cannot be arranged close to each other as shown in FIG. 5 due to mechanical and reliability restrictions, a folding mirror is arranged on the entrance side of the time-division color separation optical system (color wheel 408). While maintaining a mechanical distance by using general optical means such as disposing a prism for optical path conversion or the like, while optically viewing two from the time-division color separation optical system (color wheel 408). It is possible to minimize the ineffective area of the light from the light collector.
[0048]
【The invention's effect】
As described above, in the projection type image display device of the present invention, in the configuration in which the time-division driving is performed using the rotating color wheel, the light source image formed on or near the rotating color wheel is minimized from the light source while the light source image is minimized. , The size of the rotating color wheel can be increased, the set size can be increased, the cost can be increased, noise and reliability during rotation can be reduced, and the brightness of the projected image can be increased without color mixing.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a first embodiment of the present invention;
FIG. 2 is a configuration diagram of a color wheel according to the first and second embodiments of the present invention.
FIG. 3 is a perspective view for explaining effects of the first embodiment of the present invention.
FIG. 4 is a side view showing a configuration of a second embodiment of the present invention;
FIG. 5 is a top view showing the configuration of the second embodiment of the present invention;
FIG. 6 is a perspective view for explaining effects of the second embodiment of the present invention.
FIG. 7 is a configuration diagram of a first conventional example.
FIG. 8 is a configuration diagram of a second conventional example.
[Explanation of symbols]
100 lighting equipment
101, 201 light source
102, 317, 417 Condensing lens
103, 308, 408 color wheel
104 Light Guide
105 power supply
106, 310, 410 motor
200, 300, 400 projection image display device
202 Elliptical reflection surface
203, 208 Folding mirror
204a, 204b, 204c color filter
205 Light control wheel
206 Tricolor Wheel
207, 311, 312, 411, 412 Condenser lens
209 Projection gate array
210 relay lens
211 Aperture
212, 323, 423 Projection lens
301, 401 First lamp optical axis
302, 402 First light source
303, 403 First elliptical mirror
304, 404 Second lamp optical axis
305, 405 Second light source
306, 406 Second elliptical mirror
307, 407 system axis
309a, 409a Blue transmission dichroic filter
309b, 409b Green transmission dichroic filter
309c, 409c Red transmission dichroic filter
313,413 UV / IR Filter
314,414 Integrator optical system
315, 415 First lens array
316, 416 Second lens array
318 Transmissive LCD panel
319, 419 Micro lens of first lens array
320, 420 Micro lens of second lens array
321 and 421 polarizers
322, 422 analyzer
324, 424 screen
418 Reflective LCD panel

Claims (12)

A light source, a light-condensing device that arranges the light source at approximately one focal position and condenses light from the light source at the other focal position, and temporally converts incident light into first color light or second color light or third color light. Time-division color separation optical system that switches and emits light of different colors, a light valve that can independently modulate incident light for each pixel, and an illumination optical system that guides light from the time-division color separation optical system onto the light valve And a projection optical system for enlarging and projecting pixels on the light valve,
It said light source and said light collector is provided One not two,
The two light sources and the two light condensing devices receive light from the same surface side of the time-division color separation optical system, and the respective focal positions on the side different from the light source side of the two light-condensing devices are the time-division colors. A projection-type image display device, wherein the projection-type image display device is arranged so as to be superimposed on or near a decomposition optical system. 2. The projection type image display device according to claim 1, wherein the light collecting device is a reflector having an elliptical reflecting surface. 2. The projection type image display device according to claim 1, wherein the light collecting device comprises a reflector having a parabolic reflection surface and an optical component having a convex lens effect. A lens for converting light from the time-division color separation optical system into substantially parallel light, a first lens array for dividing incident light into partial light to form a secondary light source image, and the secondary light source 2. The projection type image display device according to claim 1, wherein the integrator optical system comprises a second lens array in which a plurality of micro lenses are arranged at an image forming position. 2. The projection type image display device according to claim 1, wherein said light valve is a reflection type light valve. The light valve is a reflection type light valve, and the shape of an exit pupil formed in the illumination optical system, which can be regarded as a light emitting surface when the illumination optical system is viewed from the light valve, is a light incident on the reflection type light valve. The axis and the dimension in the direction corresponding to the plane direction including the reflection optical axis of the reflection type light valve have a short shape. Further, of the illumination F number to the reflection type light valve, the incidence of the reflection type light valve, the reflection optical axis F1 is a direction corresponding to a plane direction including the light, and F2 is an illumination F number in a direction orthogonal to the direction. An angle formed by light incident on the reflective light valve and light reflected by the reflective light valve and incident on the projection optical system. 2. The projection type image display device according to claim 1, wherein the following relationship is satisfied when θ is θ1.
F1> 1 / (2 sin (θ1 / 2)), F2 <1 / (2 sin (θ1 / 2)) The reflective light valve has a polarizer on the optical axis on the incident side and an analyzer on the output side, and the reflective light valve can independently control the polarization direction of the incident light for each pixel. 7. The projection type image display device according to claim 5, wherein the projection type image display device is a reflective liquid crystal light valve. The reflection type light valve includes a reflection surface which can be independently controlled for each pixel, and controls the inclination angle of the reflection surface to change the emission angle of the emitted light, thereby performing light selection to the projection optical system. 7. The projection type image display device according to claim 5, wherein the image display is performed by: A lens for converting light from the time-division color separation optical system into substantially parallel light, a first lens array for dividing incident light into partial light to form a secondary light source image, and the secondary light source An integrator optical system including a second lens array in which a plurality of microlenses are arranged at image forming positions. 7. The projection type image display device according to claim 6, wherein a direction corresponding to a plane direction including the optical axis has a short shape. 7. The projection type image display apparatus according to claim 6, wherein a plane including a system axis, the plane including the two light sources, and a plane including the incident and reflected optical axes of the reflection type light valve are orthogonal to each other. The time-division color separation optical system is a rotating color wheel including light selecting means for emitting incident white light as first color light, second color light, or third color light in the angular direction of the rotating body. The projection type image display device according to claim 1, wherein Between the light-collecting devices and the time-division color separation optical system, the light beams closest to each other among the light collected on the time-division color separation optical system from or near the two light-collection devices coincide with each other. 2. The projection type image display device according to claim 1, wherein optical means capable of changing an optical path in a direction is arranged.

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