JP2004279922A - Projection display device - Google Patents

Abstract

An object of the present invention is to provide a small and inexpensive projection display device.
A projection display device including a light source, a light modulating means for modulating light from the light source, and a projecting means for projecting light modulated by the light modulating means. The light source 11 is a plurality of light sources 11r, 11g, 11b capable of emitting different color light R, G, B, and the light modulating means 17 is arranged with pixels for modulating the different color light R, G, B. It comprises a light valve driven for each pixel corresponding to R, G, and B, and the incident angles of the respective color lights R, G, and B incident from the plurality of light sources 11r, 11g, and 11b are different from each other. And a color light separating means 16 for separating each of the color lights R, G, and B into light and condensing them on each pixel on a light valve corresponding to each of the color lights R, G, and B. .
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a projection type display device, and particularly to a configuration of a small projection type liquid crystal display device.
[0002]
[Prior art]
2. Description of the Related Art A projection display device that combines image light using a light modulation device such as a liquid crystal light valve and enlarges and projects the combined image light onto a screen through a projection optical system including a projection lens or the like has been conventionally known.
FIG. 8 is a schematic configuration diagram illustrating an example of a projection display device. In the figure, reference numeral 110 denotes a light source, 120R, 120G, and 120B denote dichroic mirrors (color separation optical systems), 130 denotes a microlens array, 140 denotes a liquid crystal light valve (light modulation unit), and 150 denotes a projection lens.
The light source 110 includes a metal halide lamp 111, a spherical mirror 112 that reflects light from the lamp, and a condenser lens 113 that converts light from the lamp into parallel light. The dichroic mirrors 120R, 120G, and 120B for reflecting red light, green light, and blue light have respective wavelength bands of red (hereinafter, referred to as R), green (hereinafter, referred to as G), and blue (hereinafter, referred to as B). Is selectively reflected to separate the light of the light source 110 into three color lights. Since the dichroic mirrors 120R, 120G, and 120B are arranged at different angles by several degrees, the separated color light enters the microlens array 130 from three directions.
[0003]
The color light incident on the microlens array 130 is separated into pixels corresponding to each color light of the liquid crystal light valve 140 and modulated.
The three color lights modulated by the liquid crystal light valve 140 are projected on a projection screen 160 by a projection lens 150 as a projection optical system, and an enlarged image is displayed (for example, see Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent No. 2622185 (Page 3, FIG. 1)
[0005]
[Problems to be solved by the invention]
By the way, in the above-mentioned projection type display device, the light emitted from the light source is separated into three color lights using a dichroic mirror, and each color light is separated and modulated into pixels corresponding to each color light of the liquid crystal light valve. And a configuration in which a projection lens projects the image on a screen. Therefore, the size of the optical illumination system becomes large, and a large number of optical components are required. Therefore, it is fundamentally difficult to reduce the size of the apparatus, and there is a problem that the apparatus is not inexpensive.
[0006]
The present invention has been made to solve the above problems, and has as its object to provide a small and inexpensive projection display device.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, a projection display device of the present invention includes a light source, light modulation means for modulating light from the light source, and projection means for projecting light modulated by the light modulation means. Projection display device, wherein the light source is a plurality of light sources capable of emitting different color light, the light modulation means, a plurality of pixels that respectively modulate the different color light is arranged, corresponding to each color light It comprises a light valve driven for each pixel, the incident angle of each color light incident from the plurality of light sources is different, and each color light having a different incident angle is separated for each color light to correspond to each color light. And a color light separating means for converging light on each pixel on the light valve.
[0008]
That is, in the projection display device of the present invention, after each color light of a different color is emitted from the light source, the light enters the color light separation unit at a different angle for each color light, and the color light separation unit applies the color light to the corresponding pixel for each color light. The separated light valves serving as light modulating means are driven for each pixel corresponding to each color light to synthesize the projected image. Therefore, unlike a conventional single-panel projection display device using three dichroic mirrors for separating R, G, and B color lights from white light, a color separation optical system is not required, and the illumination optical system can be downsized. Therefore, the number of parts can be greatly reduced, and the device configuration can be simplified, so that cost reduction can be achieved.
[0009]
It is preferable that the projection display device of the present invention includes an incident angle changing unit that changes an incident angle of the color light incident on the color light separating unit from the light source for each color light.
By providing the incident angle changing means, even if the light source is arranged in a narrow space in which a different incident angle cannot be provided for each color light, for example, even if it is arranged in a plane, each color light is Since the light can be incident on the separation means at different angles of incidence, it can be arranged in a plane to reduce the size.
[0010]
As a specific form of the light source, a plurality of light emitting diodes (Light Emitting Diodes, hereinafter abbreviated as LEDs) that can emit different colors of light can be used. In addition, since the directivity of each color light emitted from the light emitting diode is not sufficient to be applicable to the projection display device of the present invention, a parallel light converting means for converting the color light emitted from the light emitting diode into parallel light. Is desirably provided.
At present, LEDs with high output for each of the R, G, and B color lights are provided. By arranging such LEDs and the parallel light converting means in a plane in a plane, the thin and compact LED of the present invention is provided. A light source suitable for a projection display device can be obtained.
[0011]
As a specific form of the incident angle changing means, it is preferable that the incident angle changing means is formed of one condenser lens into which the light parallelized by the parallelizing means is incident.
If one condenser lens is used, the angle at which the light is refracted and bent changes depending on the position where the light is incident. Therefore, if the incident position is changed for each color light, the exit angle can be changed for each color light. Further, since the condenser lens is a component that is inexpensive and does not take up installation space, it is advantageous for miniaturization and cost reduction.
[0012]
As a specific form of the color light separating means, a light modulating means in which one microlens is arranged for one set of pixels corresponding to each of the R, G, and B color lights can be used.
If the microlenses are arranged, the color light separating means suitable for the projection type display device of the present invention capable of suppressing the thickness and separating the color light can be obtained.
[0013]
In the above-mentioned projection type display device of the present invention, it is desirable to provide uniform illumination means.
By providing the uniform illumination means, the luminance distribution of the light flux incident on the light modulation means is made uniform, and the luminance distribution of the light flux modulated and projected by the light modulation means is made uniform. In other words, since the unevenness of the light beam is eliminated, it is not necessary to regulate the brightness of the light beam projected on the basis of the darkest part, and the light source only needs to emit the light beam with the minimum necessary brightness. It becomes easy to plan.
[0014]
As the uniform illumination means, it is desirable to use a rod integrator made of a transparent rod-shaped light guide or a tubular light guide having an inner surface as a reflection surface.
A fly-eye integrator is well known as a uniform illuminating means used in a projection display device. In the case of a fly-eye integrator, a space is required between two fly-eye lenses or between a fly-eye integrator and a light valve. This is an obstacle to miniaturization of the device. On the other hand, in the case of the rod integrator, the principle of illuminance uniformity is different from that of the fly-eye integrator, and light whose illuminance is already uniformed on the exit surface is obtained by repeating internal reflection of incident light in the rod lens. Therefore, a space such as a fly-eye integrator is not required, and it can be in close contact with a light source, a light valve in a subsequent stage, or the like, which is advantageous for miniaturization.
[0015]
The rod lens may have a shape that spreads from the incident side to the emission side.
Since the shape of the rod lens is tapered so that the cross section increases from the incident side to the exit side, if the light beam incident at a certain angle from the incident side is reflected once on the outer peripheral surface of the rod lens, it will be larger than the angle at the time of incidence. Will also be reflected at a small angle. That is, when the light is emitted from the rod lens, the light is emitted at an angle smaller than the angle at which the light is incident. Then, the color light leaking to the outside of the light valve when the color light is incident on the light valve from the rod lens is reduced, and the brightness of each color light incident on the light valve can be increased. As a result, the use efficiency of each color light emitted from the light source can be increased, and a small light source having a low intensity of light that can be emitted can be used.
[0016]
In addition, it is desirable to provide a polarization conversion unit that aligns the polarization state of light incident from the light source in one direction. The insertion position of the polarization conversion means may be arranged closer to the light source than the uniform illumination means, or may be arranged closer to the liquid crystal light valve than the uniform illumination means.
By providing the polarization conversion means, the light emitted from the light source can be aligned with the polarized light in one polarization direction that contributes to the display by the light valve, so that the light use efficiency can be increased and the light intensity is small and small. Light sources can also be used.
[0017]
In that case, it is desirable to use a polarized beam splitter (hereinafter abbreviated as PBS) as the polarization conversion means.
Since the PBS originally has a flat plate shape, it is suitable for the projection display device of the present invention. Further, the PBS can be used in close contact with a light source (for example, an LED array), a uniform illumination means (for example, a rod integrator), a liquid crystal light valve, or the like.
[0018]
In addition, as the polarization conversion means, a reflection type polarizer that transmits one of linearly polarized lights orthogonal to each other and reflects the other can be used, and it is desirable to use the reflection means at the same time. The insertion position of the reflective polarizer is preferably between the uniform illumination means and the liquid crystal light valve, and the arrangement position of the reflection means is desirably the incident end face of the uniform illumination means.
Since the reflective polarizer is provided, only one polarized light which contributes to display by the light valve among the light emitted from the light source can be transmitted. And since the reflection means is provided, a part of the other polarized light can be converted into one polarized light to contribute to the display, so that the light use efficiency can be increased, and the light intensity is small and small. Light sources can also be used.
[0019]
That is, the other polarized light reflected by the reflective polarizer repeats reflection between the reflective polarizer and the uniform illuminating means provided with the reflecting means. At the time of this reflection, the other polarized light rotates in the polarization direction and is partially converted into one polarized light, and can be transmitted through the reflective polarizer to contribute to display.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic diagram illustrating the overall configuration of the projection display device 10 as viewed from above, and FIG. 2 is a schematic diagram illustrating the overall configuration of the projection display device 10 as viewed from the side.
1 and 2, reference numeral 11 denotes an LED array (light source), 12 denotes a first condenser lens (parallel light conversion unit), 13 denotes a PBS (polarization conversion unit), and 14 denotes a second condenser lens (incident angle changing). Means, 15 are a rod integrator (uniform illumination means), 16 is a microlens array (color light separation means), 17 is a liquid crystal light valve (light modulation means), and 18 is a projection lens (projection means).
[0021]
As shown in FIG. 1, the projection display device 10 according to the present embodiment includes an LED array 11 in which a plurality of LEDs 11r, 11g, and 11b capable of emitting R, G, and B color lights are arranged, and LEDs 11r and 11g. , 11b, and a first condenser lens 12 in which micro condenser lenses 19, 19, 19 are arranged to convert the respective color lights into parallel lights, and polarizes the color light incident from the first condenser lens 12. A PBS 13, a second condenser lens 14 for changing the exit angle of the color light incident from the PBS 13, a rod integrator 15 for equalizing the illuminance of the color light incident from the second condenser lens 14, and a rod integrator 15 A micro-lens array 16 in which micro-lenses 20 for separating and condensing each color light incident from The liquid crystal light valve 17 for modulating each color light separated and condensed by the lens array 16 to synthesize an image, and a projection lens 18 for enlarging and projecting the image synthesized by the liquid crystal light valve 17 onto a screen S. Have been.
[0022]
As shown in FIG. 1, the horizontal arrangement of the LEDs 11r, 11g, and 11b constituting the LED array 11 is, for example, arranged in the order of LED 11b, LED 11g, and LED 11r from right to left with respect to the emission direction of the color light. In the vertical direction, as shown in FIG. 2, the LED array 11 is arranged above the system optical axis C of the projection display device 10.
The first condenser lens 12 is configured such that the microcondenser lenses 19, 19, 19 are arranged laterally so as to face the LEDs 11r, 11g, 11b, and are arranged above the system optical axis C.
[0023]
The PBS 13 is disposed as shown in FIGS. 2 and 3, and has a polarization separation film 13 a whose upper side is inclined by approximately 45 ° in the color light projection direction with respect to a plane substantially perpendicular to the color light projection direction; A reflecting mirror 13b disposed below and having a lower side inclined at approximately 45 ° to the color light projection direction with respect to a plane substantially perpendicular to the color light projection direction, and a half-wavelength plate disposed below the system optical axis C ( (A phase difference plate) 13c. In the lateral direction, as shown in FIG. 1, the LED array 11 and the first condenser lens 12 are provided at least as long as the LED array 11 and the first condenser lens 12.
[0024]
As shown in FIGS. 1 and 2, the second condenser lens 14 is composed of a single spherical lens arranged so that its central axis coincides with the system optical axis C.
As the rod integrator 15, a transparent rod-shaped light guide (for example, a glass rod) or a tubular light guide having an inner surface as a reflection surface (for example, a kaleidoscope in which a plurality of reflection mirrors are arranged in a tubular shape with the inside facing inward) ) Is used. In the case of the present embodiment, as the shape of the rod integrator, a light guide having the same cross section from the incident side to the exit side is used.
[0025]
As shown in FIG. 4, the microlens array 16 includes, for example, one microlens 20 having a substantially rectangular shape and the same vertical and horizontal curvatures, and a set of pixels 23r corresponding to each of R, G, and B color light described below. , 23g, and 23b.
The liquid crystal light valve 17 uses a TN (Twisted Nematic) mode active matrix transmission type liquid crystal cell using a thin film transistor (hereinafter abbreviated as TFT) as a pixel switching element. In the liquid crystal cell, as shown in FIGS. 4 and 5, vertically elongated stripe-shaped pixels are arranged in a matrix form, and correspond to, for example, pixels 23r and G corresponding to R from right to left with respect to the emission direction of color light. 23g, and pixels 23b corresponding to B are arranged in this order.
As shown in FIG. 1, on the outer surfaces of the liquid crystal light valve 17 and the microlens array 16, an incident-side polarizing plate 24 and an emission-side polarizing plate 25 are provided so that their transmission axes are orthogonal to each other.
[0026]
Next, the operation of the projection display device 10 having the above configuration will be described.
The R, G, and B color lights emitted from the LED array 11 are incident on the first condenser lens 12, become parallel lights, and are emitted to the PBS 13 as shown in FIG.
One of the p-polarized light Lp and the s-polarized light Ls (linearly polarized light) (for example, the p-polarized light Lp) included in each of the color lights enters the PBS 13 and passes straight through the PBS 13 as it is. The other (for example, the s-polarized light Ls) is reflected by the polarization splitting film 13a toward the reflection mirror 13b disposed below the system optical axis C, and is reflected by the reflection mirror 13b toward the liquid crystal light valve 17. , And is converted into p-polarized light Lp by the half-wave plate 13c and transmitted. In other words, each color light that is aligned with the p-polarized light Lp by passing through the PBS 13 and is incident only above the system optical axis C is emitted above and below the system optical axis C.
[0027]
As shown in FIG. 1, each color light emitted from the PBS 13 is refracted at a different angle depending on a position passing through the second condenser lens 14, and the rod integrator is different from the system optical axis C at a different angle for each color light. Injected to 15.
Referring to FIG. 1, the optical axis of the color light G from the LED 11g disposed on the system optical axis C passes through the microcondenser lens 19 and the PBS 13 along the system optical axis C, and passes through the second condenser lens 14. Incident. Since the central axis of the second condenser lens 14 coincides with the system optical axis C, the optical axis of the color light G goes straight without bending due to refraction. Further, the optical axis of the color light B from the LED 11b passes straight through the microcondenser lens 19 and the PBS 13 and enters the second condenser lens 14. Since the optical axis of the color light B is incident on a position distant from the central axis of the second condenser lens 14, it is refracted when transmitting and bends in the system optical axis C direction. Similarly, the optical axis of the color light R from the LED 11 r is refracted when passing through the second condenser lens 14 and bends in the system optical axis C direction.
[0028]
When each color light emitted from the second condenser lens 14 reaches the incident end face of the rod integrator 15, the brightness of the portion corresponding to the center of the light flux emitted from the LED is high, and the brightness of the portion corresponding to the peripheral portion is high. It has an illuminance distribution with low luminance.
When each color light is incident on the rod integrator 15, each color light repeats internal reflection inside the rod integrator 15, and the illuminance is made uniform when the light is emitted from the emission end face. When the light is internally reflected, the light is reflected at the same angle as the angle of incidence on the outer peripheral surface of the rod integrator 15 parallel to the system optical axis C, so that each color light is the same as when it is incident on the incident end face of the rod integrator 15. Fired at an angle.
[0029]
Each color light emitted from the rod integrator 15 passes through the incident-side polarizing plate 24 and enters the microlens 16.
As shown in FIG. 5, each color light incident on the microlens 16 is incident on the microlens 16 at a different angle, and is separated and condensed at a different position. Since the pixels 23r, 23g, and 23b of the liquid crystal light valve 17 are arranged at the condensing positions of the respective color lights, for example, when the pixel electrode is off, p-polarized light incident on the liquid crystal light valve 17 is converted to s-polarized light. While being (modulated) and emitted through the emission-side polarizing plate 25, the color light is blocked when the pixel electrode is in the ON state.
[0030]
An image is synthesized by selectively modulating and transmitting each color light in the liquid crystal light valve 17, and the light emitted from the liquid crystal light valve 17 is incident on the projection lens 18 as shown in FIG. Injected toward.
[0031]
According to the above configuration, different color lights of R, G, and B are emitted from the LEDs 11r, 11g, and 11b, and each color light is made to enter the microlens array 16 at a different angle. It does not require a color separation optical system. Therefore, the number of parts can be reduced and the device configuration can be simplified, so that downsizing and cost reduction can be achieved.
Further, since the color light emitted from the LED array 11 is incident on the micro lens array 16 at different angles using the second condenser lens 14, the LEDs 11r, 11g, and 11b are applied to the micro lens array 16 at different angles. The device can be arranged in a narrow space where light cannot enter, and the size can be reduced.
Further, the LED array 11 as a light source, the first condenser lens 12 as a collimating unit, and the PBS 13 as a polarizing unit have a flat plate shape, and the rod integrator 15 as a uniform illuminating unit is used even in a narrow space. Therefore, the size of the entire apparatus can be reduced as compared with the conventional apparatus.
[0032]
[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projection display device of the present embodiment is the same as that of the first embodiment. However, in the first embodiment, the cross section of the rod integrator 15 has the same size from the incident side to the emission side. However, the present embodiment is different from the first embodiment in that a rod integrator whose cross section increases from the incident side toward the emission side is used. Therefore, in the present embodiment, only the vicinity of the rod integrator will be described with reference to FIG. 6, and the description of the light source and the like will be omitted.
[0033]
In the projection type display device of the present embodiment, as the rod integrator (uniform illumination means) 51, as in the first embodiment, a transparent rod-shaped light guide or a tubular light guide having an inner surface as a reflection surface is used. A body or the like is used. As shown in FIG. 6, the shape of the rod integrator 51 is such that the cross section becomes wider from the incident end face 52 to the emission end face 53, and a reflection surface 54 is arranged on the outer periphery between the incidence end face 52 and the emission end face 53. Light guides are used.
[0034]
The operation of the projection display device having the above configuration will be described.
When each color light is incident on the rod integrator 51 from the incident end face 52, as shown in FIG. 6, each color light is reflected on the reflection surface 52 of the rod integrator 51 at the same angle as the incident angle. Since the reflection surface 52 is arranged so as to be inclined away from the system optical axis C from the incident side to the emission side, the color light reflected by the reflection surface 52 is incident upon the system optical axis C Is reflected at an angle smaller than the angle of. Therefore, when each color light is emitted from the emission end face 53, it is emitted at an angle smaller than the angle at which it was incident. Since each color light emitted from the emission end face 53 has a small angle with respect to the system optical axis C, it passes through the incident side deflection plate 24 and the microlens array 16 and enters the liquid crystal light valve 17 when it enters the liquid crystal light valve 17. Light leaking to the outside is reduced.
[0035]
According to the above configuration, since the cross section of the shape of the rod integrator 51 increases from the incident end face 52 to the emission end face 53, the angle of each color light emitted from the emission end face 53 with respect to the system optical axis C is small. Thus, light leaking outside the liquid crystal light valve 17 can be reduced. As a result, the brightness of each color light incident on the liquid crystal light valve 17 can be increased, and the use efficiency of each color light emitted from the LEDs 11r, 11g, 11b can be increased. LEDs can also be used.
[0036]
When the rod integrator 51 is used, the angle of each color light emitted from the emission end face 53 with respect to the system optical axis C can be reduced. This is because the above-described each color light is separated and collected into pixels corresponding to each color light. It does not hinder the light. For example, by adjusting the second condenser lens that forms a different angle for each color light, the angle of each color light can be arbitrarily set. Therefore, the angle of each color light emitted from the emission end face 53 is adjusted. And can be separated and condensed to pixels corresponding to each color light.
[0037]
[Third Embodiment]
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.
The basic configuration of the projection display device of the present embodiment is the same as that of the first and second embodiments, and the configurations of the polarizing means and the rod integrator are different. More specifically, a reflection type polarizer is used instead of the PBS 13 as the polarization means, and the rod integrator 15 is provided with a reflection mirror. Therefore, in the present embodiment, only the configuration of the polarization unit and the rod integrator will be described with reference to FIG. 7, and the description of the other configurations will be omitted.
[0038]
In the projection display device of the present embodiment, as the polarization conversion means, a reflective polarizer (polarized light) that transmits one (for example, p-polarized light) and reflects the other (for example, s-polarized light) among mutually orthogonal linearly polarized lights. Conversion means) 81 is used, and is disposed between the rod integrator 15 and the liquid crystal light valve 17 as shown in FIG. A reflection mirror (reflection means) 82 is disposed on the incident end face of the rod integrator 15 so that the reflection surface faces inward of the rod integrator 15. The reflection mirror 82 is provided with an opening 83 at a substantially central portion so that color light can enter the rod integrator 15 from the second condenser lens 14.
[0039]
The operation of the projection display device having the above configuration will be described.
Each color light emitted from the rod integrator 15 is incident on the reflective polarizer 81 as shown in FIG. 7, and the p-polarized light is transmitted. The s-polarized light is reflected and propagates in the rod integrator 15 in the opposite direction (incident end face side).
The s-polarized light reflected by the reflective polarizer 81 then reaches the incident end face of the rod integrator 15, but is reflected by the reflective mirror 82 because the reflective mirror 82 is arranged in a region other than the opening 83, The light is transmitted to the exit side of the rod integrator 15 again. When the s-polarized light is reflected by the inner surface of the rod integrator 15, the reflective polarizer 81, and the reflective mirror 82, the polarization direction is rotated and a part of the s-polarized light is converted to p-polarized light. The converted p-polarized light passes through the reflective polarizer 81.
[0040]
According to the above configuration, of the light emitted from the light source, only the p-polarized light that contributes to display by the light valve can be transmitted, and a part of the s-polarized light can be converted to p-polarized light to contribute to display. Therefore, the light use efficiency can be increased, and a small light source having low light intensity can be used.
In addition, since the reflective polarizer 81 has a simpler configuration than the PBS 13, the price is generally lower and the projection display device can be less expensive.
[0041]
Note that the technical scope of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the description has been made in connection with the one using the first condenser lens 12 as the collimating means. The present invention can be applied to various other methods such as a method in which the color light emitted by changing the shape of the cap portion into a lens shape becomes parallel light.
[0042]
Further, in the above-described embodiment, the description has been given by adapting the light source in which a plurality of light sources are arranged in a straight line. To be used as a surface light source.
[0043]
Further, in the above-described embodiment, the description has been given by applying the configuration in which the plurality of light sources are linearly arranged. However, the present invention is not limited to the configuration in which the plurality of light sources are linearly arranged. And those that are arranged in a curved shape.
In this case, each color light can be made to enter the liquid crystal light valve 17 at a different incident angle even if the incident angle polarizing means such as the second condenser lens 14 is not provided. Therefore, the second condenser lens 14 becomes unnecessary, the number of components can be reduced, and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a top view illustrating a projection display device according to a first embodiment of the present invention.
FIG. 2 is a side view showing the projection display device according to the first embodiment of the present invention.
FIG. 3 is a side view showing a polarizing means according to the first embodiment of the present invention.
FIG. 4 is an exploded perspective view showing a color light separating unit and a light modulating unit according to the first embodiment of the present invention.
FIG. 5 is a cross-sectional view as viewed from above showing a color light separating unit according to the first embodiment of the present invention.
FIG. 6 is a top sectional view showing a uniform illumination unit according to a second embodiment of the present invention.
FIG. 7 is a top sectional view showing a polarization unit and a uniform illumination unit according to a third embodiment of the present invention.
FIG. 8 is a schematic configuration diagram illustrating an example of a conventional projection display device.
[Explanation of symbols]
Reference Signs List 10 Projection display device 11 LED array (light source) 12 First condenser lens (parallel light conversion means) 13 PBS (polarization conversion means) 14 Second condenser lens (incident angle changing means) 15 Rod integrator (uniform illumination means) Reference Signs List 16 Microlens array (color light separation means) 17 Liquid crystal light valve (light modulation means) 18 Projection lens (projection means) 23r, 23g, 23b Pixel 51 Rod integrator (uniform illumination means) 81 Reflective polarizer (polarization conversion means) 82 Reflection mirror (reflection means)

Claims (11)

A projection display device including a light source, light modulation means for modulating light from the light source, and projection means for projecting light modulated by the light modulation means,
The light source is a plurality of light sources capable of emitting color light of different colors,
The light modulating means comprises a light valve in which a plurality of pixels respectively modulating different color lights are arranged, and each pixel corresponding to each color light is driven.
The angle of incidence of each color light incident from the plurality of light sources is configured to be different, each color light having a different angle of incidence is separated for each color light, for each pixel on the light valve corresponding to each color light A projection type display device comprising a color light separating means for condensing light. 2. The projection type display device according to claim 1, further comprising an incident angle changing unit for changing an incident angle of the color light incident on the color light separating unit from the light source for each color light. The light source is a plurality of light-emitting diodes that can each emit a different color light,
3. The projection display device according to claim 1, further comprising a parallel light converting unit that converts color light emitted from the light emitting diode into parallel light. 4. The projection type display device according to claim 3, wherein said incident angle changing means comprises one condenser lens to which the light collimated by said collimating means is incident. 5. The color light separating device according to claim 1, wherein the color light separating device includes a micro lens arranged one by one for a set of pixels corresponding to different color lights of the light modulating device. Projection display device. 6. The projection type display device according to claim 1, further comprising a uniform illumination unit for equalizing a luminance distribution of each color light incident from the light source and emitting the same. 7. The projection type according to claim 1, wherein the uniform illuminating means is a transparent rod-shaped light guide or a rod integrator formed of a tubular light guide having an inner surface as a reflection surface. Display device. 8. The projection type display device according to claim 7, wherein the rod integrator has a shape expanding from an incident side to an emission side. 9. The projection display device according to any one of claims 1 to 8, further comprising a polarization conversion unit for aligning a polarization state of light incident from the light source in one direction. 10. The projection type display device according to claim 9, wherein said polarization conversion means comprises a polarization beam splitter array. The polarization conversion means comprises a reflective polarizer that transmits one of linearly polarized lights orthogonal to each other and reflects the other,
10. The projection display device according to claim 9, further comprising a reflection unit for reflecting the polarized light reflected by the reflective polarizer to the reflective polarizer again.

Images