JPH11119150A - Illumination device and projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compactly array optical systems for a projection type display device in a narrow space. SOLUTION: The light emitted from a lamp unit 11 of an illumination device 10 in the projection type display device 1 is divided into plural partial luminous fluxs by a 1st lens plate 16, guided to a reflection mirror 19 through a 2nd lens plate 17 and the optical path of these beams is changed by 90 deg.. Then the fluxs are projected as illumination light through a superposition lens 18 and superposed to liquid crystal light bulbs 30R, 30G, 30B. Since optical part length from the device 10 up to the light bulb to be illuminated can be shortened by the lens 18, a color separating optical system 20 and a light guiding system 60 in the device 1 can compactly be arrayed in a narrow space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination device having a uniform illumination optical system and a projection display device having the illumination device.

[0002]

2. Description of the Related Art There is known a projection display apparatus having a configuration in which a modulated light beam corresponding to image information is formed using a liquid crystal light valve, and the modulated light beam is enlarged and projected on a screen (projection surface). Such a projection display apparatus has a lens in which a plurality of lenses are arranged in a matrix in order to uniformly illuminate an image forming area (illuminated area) of a liquid crystal light valve as a modulation unit with light from a light source. Some are provided with a uniform illumination optical system having two plates. For example, JP-A-3-
This is disclosed in JP-A-111806 and JP-A-5-346557. In addition, WO9 filed earlier by the applicant
It is also disclosed in Japanese Patent Publication No. 4/22042.

In the projection type display devices disclosed in these publications, a light beam emitted from a light source is separated into a plurality of partial light beams by a lens constituting a first lens plate, and a second lens The light is superimposed on the image forming area of the liquid crystal light valve via the lens constituting the plate.

FIG. 9 shows an optical system having a conventional configuration in a projection display apparatus having a uniform illumination optical system. As shown in this figure, a projection display apparatus 1000 includes an illumination device 10A in which a uniform illumination optical system 15 having two lens plates 16 and 17 is incorporated, and a light beam W emitted from the illumination device 10A in three colors. Color separation optical system 2 for separating into color light beams R, G, B
0, and each color light flux R separated by the color separation optical system,
Three liquid crystal light valves 30R, 30G, 30B for modulating G and B according to image information, and a dichroic prism for synthesizing each color light beam modulated via these liquid crystal light valves 30R, 30G, 30B. And a projection optical system 50 for enlarging and projecting the light beam synthesized by the dichroic prism 40 onto the projection surface 100. In addition, the liquid crystal light valve 30 corresponding to the blue luminous flux B
The light guide system 60 for guiding to B is provided.

The illuminating device 10A is mounted in the device such that the light emitting direction thereof matches the direction of the light projected by the projection optical system 50.
And two lens plates 16 constituting a uniform illumination optical system 15,
17 are arranged linearly.

In the projection display device 1000, the illumination device 1
Since the entire optical system including the optical elements such as the color separation optical system 20A and the like has a substantially L-shape, a portion 200 indicated by oblique lines in FIG. 7 becomes a dead space. In addition, the weight balance of the entire apparatus is poor.

Here, as shown in FIG. 10, a projection display device in which an optical system of an illuminating device 10A is configured so that two lens plates 16, 17 are orthogonal to each other with a reflecting mirror (reflecting means) 19 interposed therebetween. At 1000A, the lamp unit 1
The light emitting direction of the lighting device itself is orthogonal to the light emitting direction of the lighting device itself. Also, the lighting device 10A includes the lamp unit 1
1 is arranged so that the light emission direction is orthogonal to the direction of the light projected by the projection optical system 50. In the optical system having this configuration, the optical path in the illumination device is bent by the reflection mirror 19, and the dead space on the back side of the illumination device 10A is reduced.

[0008]

However, FIG.
In the case of employing the optical system shown in FIG.
01 still has a large dead space.

An object of the present invention, in view of the above, is to provide an illumination device in a projection display device, in which an optical system constituted by each optical element can be compactly integrated in a small space. . Another object of the present invention is to provide a projection display device incorporating the lighting device.

[0010]

In order to solve the above problems, an illumination device according to the present invention includes a lamp unit and a plurality of lenses arranged in a matrix, and outputs a plurality of light beams from the lamp unit to a plurality of lenses. A first lens plate that divides the light into partial light beams, a second lens plate that includes a plurality of lenses arranged in a matrix, and is disposed near a position where the partial light beams are converged, and Superimposing means for superimposing the emitted light on the illuminated area; and being disposed between the second lens plate and the superimposing means, and reflecting the light emitted from the second lens plate toward the superimposing means. And a reflecting means.

In the illuminating device according to the present invention, the two lens plates are both arranged on the upstream side of the optical path of the reflecting means (on the lamp unit side), and the partial luminous flux emitted from the second lens plate is located on the downstream side of the optical path of the reflecting means. Is superimposed on the illuminated area by the superimposing means arranged in the area. Therefore, the distance from the superimposing means of the illumination light emitted from the illumination device to the illuminated area is shortened. That is, the overlapping distance from the superimposing means of the illumination device to the illuminated area is the overlapping distance from the second lens plate to the illuminated area when only the uniform illumination optical system including the first and second lens plates is used. It is shorter than.

For this reason, if the illumination device of the present invention is used for a projection display device, the length of the optical path from the illumination device to the light valve, which is the illuminated area, can be shortened, and the optical system ( Color separation optical system, light guide system, etc.) can be arranged compactly in a narrow space.

In the illumination device of the present invention, the two lens plates are both arranged on the optical path upstream side of the reflecting means. For this reason, if the optical path from the lamp unit to the reflecting means is straight, the length of the illumination device in the optical path direction becomes large. For example, in the projection display device as shown in FIG. When used as a lighting device, the dead space on the back side of the lighting device can be effectively used, so that the projection display device itself does not increase in size.

Further, in the illumination device of the present invention, the direction of the emitted illumination light can be easily changed only by changing the direction of reflection of the light by the reflection means. Since the emission direction of the illumination light can be easily changed in this manner, the degree of freedom in designing the arrangement of each component of the projection display device in which the illumination device is incorporated is increased.

Here, the extent to which the optical path is changed by the reflection means may be set in accordance with the arrangement relationship of the optical system of the projection display device and other mechanical parts. For example, FIG.
In the case where the illumination device to which the present invention is applied is incorporated in the projection display device shown in (1), the optical system including the illumination device can be most compactly integrated by changing the optical path by the reflection means to 90 degrees.

The lighting device of the present invention can also be applied to a type that separates a plurality of color lights in the device. That is, a first lens plate including a lamp unit, a plurality of lenses arranged in a matrix, and dividing a light beam emitted from the lamp unit into a plurality of partial light beams, and a plurality of lenses arranged in a matrix A second lens plate disposed near a position where the partial light beam is condensed; condensing means for condensing light emitted from the second lens plate; A reflection unit disposed between the second lens plate and the light collection unit, the reflection unit reflecting light emitted from the second lens toward the light collection unit; and the reflection unit is emitted from the second lens plate. A plurality of dichroic surfaces for separating the luminous flux into a plurality of color lights, and a reflecting surface for reflecting any of the plurality of color lights.

In such an illuminating device of the present invention, the two lens plates are both arranged on the upstream side of the light path of the reflecting means (the lamp unit side), and the partial luminous flux emitted from the second lens plate is reflected by the reflecting means. The light is condensed on the illuminated area by the condensing means arranged on the downstream side of the optical path. Therefore, the distance from the converging means of the illumination light emitted from the illumination device to the illuminated area is shortened. That is, the distance from the condensing means of the illumination device to the illuminated area is equal to the distance from the second lens plate to the illuminated area when only the uniform illumination optical system including the first and second lens plates is used. It is shorter than that.

For this reason, if this illumination device is used for a projection display device, the length of the optical path from the illumination device to the light valve, which is the area to be illuminated, can be shortened, and the optical system after the illumination device can be arranged in a narrow space Can be arranged compactly within. Further, if the illumination device of the present invention is used, it is not necessary to install a color separation optical system in an optical system subsequent to the illumination device, so that the effect of compactly arranging the optical systems in a small space is great.

Further, in the illumination device of the present invention, the direction of the emitted illumination light can be easily changed only by changing the direction of reflection of the light by the reflection means. Since the emission direction of the illumination light can be easily changed in this manner, the degree of freedom in designing the arrangement of each component of the projection display device in which the illumination device is incorporated is increased.

In addition, in the lighting device of the present invention, each color light separated by the reflecting means provided with the dichroic surface and the reflecting surface provided in the device is guided to each pixel of the corresponding light valve. For this reason, since the light is not blocked by the color filter of the light valve, the light use efficiency is high and a bright projected image can be obtained. The lighting device of the present invention can be applied to a projection display device capable of projecting a color image. In this case, the projection display device includes a color separation unit that separates a light beam emitted from the lighting device into a light beam of each color, and a plurality of light beams that modulate the light beams of each color separated by the color separation device in accordance with image information. A light valve,
What is necessary is just to have the structure which has the color synthesizing means which synthesize | combines the luminous flux of each color modulated by each of the said light valves, and the projection means which enlarges and projects the luminous flux synthesize | combined by the said color synthesis means on a projection surface.

For example, in a so-called three-panel type projection display device using three light valves, the color separation means transmits the first color light component of the light beam from the illumination device, and A first reflecting the second and third color light components
A dichroic mirror, a second dichroic mirror that transmits the second color light component and reflects the third color light component, and a reflection unit that bends an optical axis of the first color light component. The first, second, and third color light components may be modulated by the first, second, and third light valves.

The present invention is not limited to the above-mentioned three-panel type projection display device, but also includes a reflecting means for changing the optical path of the light beam emitted from the lighting device, and a light beam whose optical path has been changed by the reflecting means. Incorporating the illumination device of the present invention into a so-called single-panel projection display device having a light valve that modulates in accordance with (1) and a projection unit that enlarges and projects a light beam modulated by the light valve onto a projection surface. Of course, it is also possible. In particular, if the illumination device of the present invention is incorporated in a single-panel projection display device in which the optical path is changed by 90 degrees by the reflection means, the size of the device itself can be reduced.

Further, the illuminating device of the present invention comprises a polarization separating means for separating a light beam emitted from the illuminating device into a P-polarized light beam and an S-polarized light beam, and modulates each polarized light beam.
Two light valves, and polarization combining means for combining the polarized light fluxes modulated by each of the light valves,
It is also possible to incorporate the light flux combined by the polarization combining means into a projection display apparatus having projection means for enlarging and projecting the light flux on a projection surface. According to such a projection display device, in addition to the effect obtained by incorporating the illumination device of the present invention, both polarized light beams can be used without waste by using the polarization separating means and the polarization combining means. Therefore, a bright projection image can be obtained.

Here, an illumination device for separating a plurality of color lights in the device includes a light valve that modulates a plurality of color lights emitted from the illumination device corresponding to an upper part of an image, and a light beam modulated by the light valve. Projection means for enlarging and projecting on a projection surface, wherein the light valve includes a plurality of pixels;
It is possible to incorporate the plurality of color lights emitted from the illumination device into a projection display device including light guide means for guiding each of the plurality of color lights to the pixel. According to such a projection display device, a plurality of color lights can be guided to the corresponding pixels by the illumination device, and the light is not blocked by the color filter of the light valve. A bright projection image can be obtained.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An illumination device to which the present invention is applied and a projection display device will be described below with reference to the drawings.

[Embodiment 1] FIG. 1 shows a schematic configuration of an optical system of a projection display apparatus according to Embodiment 1 of the present invention. The projection display device 1 shown in FIG. 1 separates a light beam emitted from a lighting device into three color light beams of red, blue, and green, and separates the separated color light beams through three light valves including a liquid crystal panel and the like. This is a so-called three-plate type projection display device that modulates in accordance with image information, recombines the modulated light beams of each color, and projects and displays the light beams on a projection surface via a projection optical system.

As shown in FIG. 1, a projection type display device 1 of the present embodiment includes a lighting device 10 to which the present invention is applied and a light beam W emitted from the lighting device 10 for each of red, green, and blue light beams ( First, second, and third color light components) a color separation optical system 20 for separating into R, G, and B, and three liquid crystals as light valves that modulate each color light beam separated by the color separation optical system 20 It includes light valves 30R, 30G, 30B, a dichroic prism 40 as a color synthesizing optical system for resynthesizing the modulated color light beam, and a projection optical system 50 for enlarging and projecting the synthesized light beam onto the projection surface 100. Further, a light guide system 60 for guiding the blue light flux B among the respective color light fluxes separated by the color separation optical system 20 to the corresponding liquid crystal light valve 30B is provided.

The lighting device 10 includes a lamp unit 11,
A uniform illumination optical system 15 is provided on the optical axis of the light beam emitted from the lamp unit 11. The lamp unit 11 includes a light source lamp 12 such as a halogen lamp, a metal halide lamp, and a xenon lamp, and the light source lamp 1.
Reflector 1 that reflects the divergent light of 2 so as to become parallel light
3 and is arranged such that the direction of the central optical axis 1 a of the light reflected by the reflector 13 is orthogonal to the direction of the light projected by the projection optical system 50. As the reflector 13, a reflector having a parabolic shape, an elliptical shape, or the like is used. The uniform illumination optical system 15 divides the light beam emitted from the lamp unit 11 into a plurality of partial light beams, and separates each of the partial light beams into the liquid crystal light valves 30R, 30G, 30.
B, the liquid crystal light valve 30
It has a function of illuminating R, 30G, and 30B with substantially uniform illuminance. The uniform illumination optical system 15 includes a first lens plate 16 having a plurality of rectangular lenses arranged in a matrix.
The first lens plate 16 is provided with the lamp unit 1
The light beam emitted from 1 is spatially divided into a plurality of partial light beams,
Each partial light beam is focused at a predetermined position.

Near the position where each partial light beam converges, the first
Similarly to the lens plate 16 of the first embodiment, a second lens plate 17 having a plurality of rectangular lenses arranged in a matrix is arranged, and the partial light flux emitted from each rectangular lens of the first lens plate 16 is the second lens plate. To the corresponding rectangular lens of the lens plate 16.

The partial luminous flux incident on each rectangular lens of the second lens plate 17 is transmitted from the rectangular lens to the reflection mirror 1.
The light is emitted toward the mirror 9 and the optical path is
The light is bent by 0 degrees and reflected in a direction substantially parallel to the direction of the light projected by the projection optical system 50.

The partial light beams reflected by the reflecting mirror 19 are superimposed on the corresponding liquid crystal light valves 30R, 30G, 30B by the superimposing lens 18.

Each color separation optical system 20 includes a blue-green reflecting dichroic mirror (first dichroic mirror) 21 and
It comprises a green reflecting dichroic mirror (second dichroic mirror) 22 and a reflecting mirror 23. First, the light beam W emitted from the illumination device 10 is converted by the blue-green reflecting dichroic mirror 21 so that the blue light beam (third color light component) B and the green light beam (second color light component) G contained in the dichroic mirror 21 are substantially perpendicular to each other. The light is reflected and travels toward the green reflecting dichroic mirror 22.

The red light flux (first color light component) R passes through the blue-green reflecting dichroic mirror 21 and is reflected at substantially a right angle by the rear reflecting mirror 23, so that the red light flux R exits 2.
4 is emitted to the dichroic prism 40 side.
The green and blue luminous fluxes G and B reflected by the blue-green reflecting dichroic mirror 21 are formed such that only the green luminous flux G is reflected at a right angle by the green reflecting dichroic mirror 22,
From the emission part 25 of the green light flux G to the dichroic prism 4
It is emitted to the 0 side. The blue luminous flux B transmitted through the green reflecting dichroic mirror 22 is transmitted to the emission section 26 of the blue luminous flux B.
From the light guide system 60 side. In the present example, the distances from the emission unit of the illumination device 10 to the emission units 24, 25, and 26 of the respective color luminous fluxes in the color separation optical system 20 are set to be substantially equal.

The red and green luminous fluxes R and G of the color separation optical system 20
The condenser lenses 71 and 72 are disposed on the exit sides of the exit sections 24 and 25, respectively. Therefore, the red light beam R and the green light beam G emitted from each of the emission units are incident on the respective condenser lenses 71 and 72 and are parallelized.

The red light beam R and the green light beam G thus collimated enter the liquid crystal light valves 30R and 30G and are modulated, and image information corresponding to each color light is added.
That is, these light valves are switching-controlled by drive means (not shown) in accordance with the image information, whereby the modulation of each color light passing therethrough is performed. As such a driving means, a known means can be used as it is. On the other hand, the blue light flux B is guided to the corresponding liquid crystal light valve 30B via the light guide system 60, where it is similarly modulated according to image information. In addition, as the liquid crystal light valve of this example, for example, a liquid crystal light valve in which an active matrix type liquid crystal panel having a polysilicon TFT as a switching element is disposed between a pair of polarizing plates can be used.

The light guide system 60 is disposed between the light-collecting lens 61, the incident-side reflection mirror 62, and the exit-side reflection mirror 63, which are disposed on the exit side of the exit portion 26 of the blue light flux B, and between these mirrors. Intermediate lens 64 and liquid crystal light valve 30
And a condenser lens 65 disposed on the front side of B. The length of the optical path of each color light beam, that is, the distance from the illuminating device 10 to each liquid crystal light valve is the longest for the blue light beam B, and therefore, the light amount loss of this light beam is the largest. However, by interposing the light guide system 60, the loss of the light amount can be suppressed.

Next, each of the liquid crystal light valves 30R, 30R
Each color light flux modulated through G and 30B is incident on the dichroic prism 40 and recombined. The recombined color image is enlarged and projected on the projection surface 100 at a predetermined position via the projection optical system 50.

Here, each optical path from the illuminating device 10 to each of the liquid crystal light valves 30R, 30G, 30B is bent using a reflection mirror or the like for reasons such as compactness of the optical system. Is equivalent to an optical system in which each lens is arranged along a linear system optical axis L. FIG. 2A shows an equivalent optical system of the illumination device 10 of the present example, and FIG. 2B shows an equivalent optical system of the illumination device 10A having the conventional configuration shown in FIG. The lighting device 1
The color separation optical system 20 configured between the liquid crystal light valves 30R, 30G, and 30B is omitted.

In the illumination device 10 of the projection display device 1 of this embodiment, the two lens plates 16 and 17 are
And the second lens plate 1
The partial light beam emitted from 7 is superimposed on each of the liquid crystal light valves 30R, 30G, 30B by the superimposing lens 18 arranged on the downstream side of the optical path of the reflection mirror 19. Therefore, as can be seen by comparing the equivalent optical systems of FIGS. 2A and 2B, the length r1 of the light path inside the lighting device 10 is longer than the length r2 of the light path inside the lighting device 10A. Become.

On the other hand, when the lighting device 10 of this embodiment is used, the liquid crystal light valves 30R, 30R,
The distance R1 to 0G and 30B is the uniform illumination optical system 1 including the first and second lens plates 16 and 17 as in the related art.
5 is shorter than the distance R2 from the second lens plate 17 to the liquid crystal light valves 30R, 30G, 30B when the light emitting device 5 is incorporated in the lighting device. That is, according to this example, the lighting device 10 supplies the liquid crystal light valves 30R, 30G, and 30B.
The length of the optical path up to can be reduced. Therefore, the lighting device 10
In the projection display device 1 in which is embedded, the area required for disposing the optical system (the color separation optical system 20 and the light guide system 60) after the illumination device can be reduced, and the size of the device can be reduced. it can.

In the lighting device 10, the length r1 of the light path inside is longer than that of the conventional lighting device 10A. However, a reflecting mirror 19 is provided to bend the light path of the light beam emitted from the lamp unit 11 by 90 degrees. By doing
The lengthened portion, particularly the portion from the lamp unit 11 to the reflection mirror 19, is located in a dead space generated on the back side of the lighting device 10. Therefore,
In the conventional configuration, a portion that remains as a dead space can be used for arranging a part of the illumination device 10, so that each optical element (the illumination device 10, the color separation optical system 20, the light guide system 60, and the like).
Can be arranged in a state of good weight balance as a whole.

As described above, according to the projection display apparatus 1 including the illumination device 10 of this embodiment, the weight balance of the device can be improved in addition to the fact that the device can be configured to be small and compact.

The projection display device 1 shown in FIG. 1 uses a dichroic prism 40 to
Although the color light beams modulated by R, 30G, and 30B are combined, the color combination may be performed using a dichroic mirror for color combination instead of using the dichroic prism 40. FIG. 3 shows an optical system of a projection display apparatus 1A of a type in which color synthesis is performed using a dichroic mirror for color synthesis. Parts common to the projection display apparatus 1 shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the projection type display device 1A shown in FIG. 3, each of the color light beams R, G, and R modulated by the color synthesizing optical system 40A having two dichroic mirrors 41 and 43 for color synthesis.
B is synthesized. That is, the projection display device 1 of the present embodiment
In A, the red luminous flux R modulated by the liquid crystal light valve 30R passes through the color synthesizing dichroic mirror 41, and the green luminous flux G modulated by the liquid crystal light valve 30G is reflected by the color synthesizing dichroic mirror 41 to produce two colors. Color synthesis is dichroic mirror 41 for color synthesis
Done by

The synthesized red and green luminous fluxes R and G are incident on a color synthesizing dichroic mirror 43 and reflected by the mirror 43.

On the other hand, the blue light flux B modulated by the liquid crystal light valve 30B is reflected by the reflection mirror 42 and enters the color synthesizing dichroic mirror 43. The blue light beam B incident on the color synthesizing dichroic mirror 43 is
The light passes through the mirror 43. As a result, the red and green light beams R and G and the blue light beam B are combined by the color combining dichroic mirror 43. The synthesized light is transmitted through the projection optical system 50 to the projection surface 10 like the projection display device 1 described above.
0 is projected on the surface.

The projection display device 1A thus configured
Since the illumination device 10 to which the present invention is applied is incorporated in the device, the area required for disposing the optical system after the illumination device can be reduced, as in the case of the projection display device 1 described above. The device can be made compact. In addition, since the dead space on the back side of the illumination device 10A having the conventional configuration can be used to arrange a part of the illumination device 10, each optical element (the illumination device 10, the color separation optical system 20, and the color combining optical system 40A) is used. Can be arranged in a well-balanced manner, and the weight balance of the device can be improved. In addition, in the projection display apparatus 1A of this embodiment, the color synthesis optical system 40A is configured by the dichroic mirrors 41 and 43 for color synthesis. Although the optical path length of the optical system becomes longer, the use of a dichroic prism, which is complicated and expensive, is advantageous in reducing the cost of the apparatus.

[Second Embodiment] FIG. 4 is a schematic configuration diagram of an optical system of a projection display apparatus 1B according to a second embodiment of the present invention. In the projection display device 1B of the present example, the same reference numerals are given to portions common to the projection display device 1 described above, and description thereof will be omitted.

The projection type display device 1B shown in FIG. 4 is a so-called single-panel type projection type display device using one liquid crystal light valve 30, and a light beam W emitted from the illumination device 10 is almost perpendicularly reflected by a reflection mirror 81. The light beam is guided to the liquid crystal light valve 30 via the condenser lens 82. In the projection display device 1B of this example,
The illuminating device 10 is arranged so that the light emitting direction of the lamp unit 11 and the direction of the projection light by the projection optical system 50 are opposite, so that the illuminating device 10 and the optical system after the illuminating device are parallel. It is.

FIG. 5 shows an example of the liquid crystal light valve 30 used in the projection type display device 1B of this embodiment. As shown in this figure, a liquid crystal light valve 30 is a liquid crystal light valve for color modulation, and includes an element substrate 31 and an opposing substrate 32 fixed to face the element substrate 31.
And a liquid crystal panel in which a liquid crystal is sealed between these substrates and a liquid crystal layer 33 is formed therein.

The element substrate 31 is made of glass, quartz, or the like, and on its surface, a source line 311 and a gate line 312 are formed in a lattice, and a thin film transistor (TFT) 313 is connected to these. . A transparent pixel electrode 314 is connected to the thin film transistor 313 in series.

On the other hand, a counter electrode 321 is formed on the surface of the counter substrate 32. When a voltage is applied to the pixel electrode 314 via the thin film transistor 313, the counter electrode 321 is sandwiched between the pixel electrode 314 and the counter electrode 321. The liquid crystal is driven. A color filter 322 is formed on the surface of the counter substrate 32. Color filter 322
Is a filter R 'that transmits a red light flux R, a green light flux G
And a filter B ′ that transmits the blue luminous flux B. In this example, these filters R ', G', and B 'are arranged in a mosaic type. Further, the peripheral portion of the pixel electrode 314 is shielded from light by the light shielding portion 326.

The color filter 322 can be formed by dyeing or dispersing a pigment. Further, since the dichroic film of the dichroic mirror is very excellent in light transmittance, it is desirable to form a color filter from the dichroic film.

In the projection type display device 1B of this embodiment, the liquid crystal panel as described above is sandwiched between two polarizing plates 34 and 35 and used as a transmission type liquid crystal light valve. When the light beam W emitted from the illumination device 10 is made incident on the liquid crystal light valve 30, only a predetermined color light beam of the output light beam W is transmitted by each filter of the color filter 322, and the color light beam is modulated. Can be.

Since the illumination device 10 to which the present invention is applied is incorporated in the projection type display device 1B of this embodiment, the area for disposing the optical system after the illumination device can be reduced, and the projection type display device 1B can be used. The display device can be configured to be small and compact. Also, the illumination device 10 and the optical system after the illumination device are set in parallel so that each optical element (the illumination device 10,
The color separation optical system 20 and the color combining optical system 40A) are arranged in a well-balanced manner. For this reason, the weight balance of the device can be improved. In addition, in the projection display device 1B of this example, since each color light flux is modulated by one liquid crystal light valve 30, the optical system after the illumination device can be simplified, and the device can be reduced in size and cost. This is very advantageous for cost reduction.

[Embodiment 3] FIG. 6 shows a schematic configuration of an optical system of a projection display apparatus 1C according to Embodiment 3 of the present invention. The projection display device 1C of the present example is a lighting device 1
The outgoing light beam W from 0 is separated into two types of polarized light beams by a polarization separating element, each polarized light beam is modulated by a liquid crystal light valve, and the modulated polarized light beams are combined by a polarization combining element, and then the projection optical system. To enlarge and project on the projection surface. In this example, the same reference numerals are given to portions common to the projection display device 1 described above, and description thereof will be omitted.

In the projection display device 1C of this embodiment, the light beam W emitted from the illumination device 10 is incident on a polarization beam splitter 91 which is a polarization separation element. Incident outgoing light beam W
Is split into a P-polarized light beam and an S-polarized light beam by the polarization splitting surface 911 of the polarizing beam splitter 91 which is arranged at an angle of approximately 45 degrees with respect to the central optical axis of the emitted light beam W.
In this example, the P-polarized light beam passes through the polarization separation surface 911 and
The polarized light beam is bent at a right angle by the polarization separation surface 911.

The P-polarized light beam transmitted through the polarization beam splitter 91 is bent at a right angle by the first reflection mirror 85 and guided to the first liquid crystal light valve 30P via the condenser lens 83. On the other hand, the polarization beam splitter 9
The S-polarized light beam bent by the first reflecting mirror 86 is bent at a right angle by the second reflection mirror 86, and the condensing lens 8
4 to the second liquid crystal light valve 30S.

The P-polarized light beam and the S-polarized light beam are modulated by the first and second liquid crystal light valves 30P and 30S. In this example, the liquid crystal light valves for color modulation described with reference to FIG. 5 are used as the first and second liquid crystal light valves 30P and 30S. Instead of using both liquid crystal light valves 30P and 30S as color modulation liquid crystal light valves, one liquid crystal light valve is used as a color modulation liquid crystal light valve and the other liquid crystal light valve is used as a black and white modulation liquid crystal light valve. It is also possible to use a liquid crystal light valve. The liquid crystal light valve for monochrome modulation has a structure in which the color filter is removed from the liquid crystal light valve for color modulation, and the basic structure of the pixel electrode, the counter electrode, and the like is the same as that of the liquid crystal light valve for color modulation.

First and second liquid crystal light valves 30
The P-polarized light beam and the S-polarized light beam modulated by P and 30S enter a polarization beam splitter 92 for polarization synthesis. The incident P-polarized light beam is bent at a right angle by the polarization splitting surface 921 of the polarization beam splitter 92, while
The S-polarized light beam passes through the polarization separation surface 921 as it is. As a result, each of the liquid crystal light valves 30P, 3P
The P-polarized light beam and the S-polarized light beam modulated by OS are polarized and combined by the polarization beam splitter 92. Thereafter, the combined light flux is enlarged and projected on the screen 100 by the projection optical system 50.

The projection display device 1C thus configured
Also, since the illumination device 10 to which the present invention is applied is incorporated, the area required for disposing the optical system after the illumination device can be reduced, and the projection display device can be configured to be small and compact. Weight balance can be improved. In addition to this, in the projection display device 1C of this example,
By using the polarization beam splitters 91 and 92 for polarization separation and polarization synthesis, both polarized light beams can be used without waste, so that a bright projected image can be obtained.

[Fourth Embodiment] FIG. 7 is a schematic configuration diagram of an optical system of a projection display apparatus 1D according to a fourth embodiment of the present invention. The projection display device 1D shown in FIG.
This is the same as the projection display device 1B according to the second embodiment described above in that it is a so-called single-panel projection display device using one liquid crystal light valve 30D. Therefore, in the projection display device 1D of the present embodiment, the same parts as those of the projection display device 1B described above are denoted by the same reference numerals, and description thereof will be omitted.

In each of the above-described embodiments, the light emitted from the lighting device is separated into three colors, but in this embodiment, color separation is performed in the lighting device 10D.
That is, in the present embodiment, instead of the reflection mirror 19 in the above-described embodiment, a plate-like dichroic mirror 190 having a plurality of red reflection dichroic films 191 and green reflection dichroic films 192 as dichroic surfaces formed on both surfaces; A reflecting means including a reflecting mirror 193 as a reflecting surface is employed. The red light flux (first color light component) R included in each partial light flux emitted from the second lens plate 17 is reflected by the red reflecting dichroic film 191, and the green light flux (second color light component) G is
The blue light flux (third color light component) B is reflected by the green reflection dichroic film 192 and is reflected by the reflection mirror 193. Accordingly, the respective partial light beams emitted from the second lens plate are reflected at substantially right angles while being separated into three colors, respectively, and a condensing lens 180 as condensing means and another condensing lens 82 The light is condensed near the liquid crystal light valve 30D via.

As shown in FIG. 8, the liquid crystal light valve 30D includes a liquid crystal panel 3 between a pair of polarizing plates 340 and 350.
00, and diffraction gratings 360 and 370 are arranged on the incident surface side of the incident side polarizing plate 340 and on the exit surface side of the exit side polarizing plate 350, respectively. Further, a pair of polarizing plates 340 and 350, a liquid crystal panel 300,
The diffraction gratings 360 and 370 are fixed around the periphery thereof by a frame 380, and the liquid crystal panel 300 is substantially sealed.

The incident-side diffraction grating 360 has the same function as a condenser lens, and is a light guide means for guiding each color light beam to a corresponding pixel of the liquid crystal panel. The configurations of the liquid crystal panel 300 and the pair of polarizing plates 340 and 350 are substantially the same as those of FIG. 5 described above. However, in this embodiment, since the light incident on the liquid crystal light valve 30D has already been separated into three color lights, the color filter 322 (see FIG. 5) is unnecessary. In the drawing, reference numeral 301 denotes a light shielding unit. Each color light flux guided to each pixel of the liquid crystal panel 300 by the diffraction grating 360 is modulated based on a predetermined image signal.

The exit-side diffraction grating 370 has the same function as a condenser lens, and reduces diffusion of a light beam emitted from the exit-side polarizing plate 350. As described above, by providing the emission-side diffraction grating 370 that reduces the diffusion of the light beam, the amount of light that enters only the projection optical system 50 can be increased, and a bright projection image can be obtained.

The projection display 1D according to the present embodiment is
The same effects as those of the projection display according to the second embodiment can be obtained. Further, in the present embodiment, the dichroic mirror 190 provided in the lighting device 10D is used.
Since the color light separated by the reflection mirror 193 is guided to each pixel of the light valve 30D, the light is not blocked by the color filter. Therefore,
It is possible to obtain a bright projection image with high light use efficiency.

The incident-side diffraction grating 360 and the outgoing-side diffraction grating 370 can be replaced with microlens arrays.

[0069]

As described above, in the illumination device of the present invention, both lens plates are arranged on the optical path upstream side of the reflection means. Further, by superimposing the partial light beam emitted from the second lens plate on the illuminated area by the superimposing means arranged on the downstream side of the optical path of the reflecting means, the overlapping distance from the superimposing means to the illuminated area is shortened. I have to.

Therefore, when the illumination device of the present invention is used for a projection display device, the length of the optical path from the illumination device to the light valve can be shortened, and the optical system (color separation optical system, light guide system, ) Can be compactly arranged in a narrow space. For this reason, the projection display device can be configured to be small and compact.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical system of a projection display device according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining a difference in a superposition distance between a case where an illumination device having a superposition lens is incorporated and a case where an illumination device without a superposition lens is incorporated.

FIG. 3 is a diagram showing a modification of the optical system of the projection display device shown in FIG.

FIG. 4 is a schematic configuration diagram of an optical system of a single-panel projection display device.

5 is a diagram showing an example of a liquid crystal light valve for color modulation incorporated in the projection display device shown in FIG.

FIG. 6 is a schematic configuration diagram of an optical system of a projection display device including a polarization beam splitter for polarization separation and polarization synthesis.

FIG. 7 is a schematic configuration diagram of an optical system of a projection display apparatus according to Embodiment 3 of the present invention.

8 is a schematic configuration diagram of a liquid crystal light valve incorporated in the projection display device shown in FIG.

FIG. 9 is a schematic configuration diagram of an optical system of a conventional projection display device.

FIG. 10 is a schematic configuration diagram of an optical system of a projection display device including an illumination device provided with a reflection mirror.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C, 1D Projection display device 10 Illumination device 11 Lamp unit 12 Light source lamp 13 Reflector 15 Uniform illumination optical system 16 First lens plate 17 Second lens plate 18 Superposition lens 19 Reflection mirror 20 Color separation Optical system 21 Blue-green reflecting dichroic mirror 22 Green reflecting dichroic mirror 30, 30P, 30S, 30R, 30G, 30B, 30
D Liquid crystal light valve 40 Dichroic prism 40A Color synthesis optical system 41, 43 Dichroic mirror for color synthesis 50 Projection optical system 60 Light guide system 81 Reflection mirror 91 Polarization beam splitter for polarization separation 92 Polarization beam splitter for polarization synthesis 100 Projection surface

Claims (9)

[Claims] A first lens plate that includes a lamp unit, a plurality of lenses arranged in a matrix, and divides a light beam emitted from the lamp unit into a plurality of partial light beams; and a plurality of lenses arranged in a matrix. A second lens plate disposed near a position where the partial light beam is focused; a superimposing unit configured to superimpose light emitted from the second lens plate on an illuminated area; Disposed between the lens plate and the superimposing means,
A reflecting unit for reflecting light emitted from the second lens plate toward the superimposing unit. 2. The lighting device according to claim 1, wherein the reflecting means reflects the light emitted from the second lens at a right angle. 3. A lamp unit, a first lens plate having a plurality of lenses arranged in a matrix and dividing a light beam emitted from the lamp unit into a plurality of partial light beams, and a plurality of lenses arranged in a matrix. A second lens plate disposed in the vicinity of the position where the partial light beam is converged, a light condensing means for condensing light emitted from the second lens plate, and a second lens plate And the light collecting means,
Reflecting means for reflecting light emitted from the second lens plate toward the condensing means, wherein the reflecting means separates a light beam emitted from the second lens plate into a plurality of color lights. Multiple dichroic surfaces,
And a reflecting surface that reflects any one of the plurality of color lights. 4. The illuminating device according to claim 1, wherein the luminous flux emitted from the illuminating device is divided into luminous fluxes of a plurality of colors; A plurality of light valves that modulate according to image information; a color combining unit that combines light beams of respective colors modulated by the respective light valves; and a light beam combined by the color combining unit that is enlarged and projected on a projection surface. A projection type display device comprising: 5. The color separation device according to claim 4, wherein:
A first dichroic mirror that transmits a first color light component and reflects second and third color light components of the light beam emitted from the illumination device, and transmits the second color light component;
A second dichroic mirror that reflects the third color light component; and a reflection unit that bends an optical path of the first color light component, wherein the first, second, and third color light components are first, second, and third light components. 2. A projection display device, wherein the light is modulated by the third and third light valves. 6. A lighting device according to claim 1, wherein the reflecting device changes an optical path of a light beam emitted from the lighting device, and the light beam whose optical path is changed by the reflecting device corresponds to image information. A projection display device, comprising: a light valve that modulates light; and a projection unit that enlarges and projects a light beam modulated by the light valve onto a projection surface. 7. The projection display device according to claim 6, wherein an optical path is changed by 90 degrees by said reflection means. 8. A lighting device according to claim 1, wherein the light beam emitted from the lighting device is separated into a P-polarized light beam and an S-polarized light beam, and a plurality of lights for modulating the respective polarized light beams. A light-emitting device comprising: a bulb; a polarization combining unit that combines the polarized light beams modulated by the light valves; and a projection unit that enlarges and projects the light beam combined by the polarization combining unit onto a projection surface. Projection display device. 9. A lighting device according to claim 3, a light valve for modulating the plurality of color lights emitted from the lighting device in accordance with image information, and a projection surface for emitting a light beam modulated by the light valve. The light valve includes: a plurality of pixels; and a light guide unit that guides each of the plurality of color lights emitted from the lighting device to the pixels. Projection display device.