JP2001109070A - An illumination optical device and a projection display device using the same. - Google Patents

Abstract

(57) [Problem] To provide an illumination optical device in which the size of the device is reduced and the light use efficiency is improved by arranging a control lens, and a projection display device using the same. SOLUTION: A light condensing means 31 for condensing light emitted from a light source 30, a first lens array plate 32 for dividing light incident from the light condensing means 31 into a large number of light beams, and a first lens array plate The second lens array plate 3 on which the light from 32 is incident
3 and the optical distance z2 'between the image forming means 40 and the second lens array plate 33,
And a lens 37 for controlling the distance from the lens array plate 33 to be shorter than the physical distance z2. As a result, the optical path length for illumination can be optically controlled to be short while securing the physical distance for securing the arrangement space for the optical components, thereby improving the light use efficiency while reducing the size of the device. it can.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an illumination optical device for illuminating image forming means with light from a light source, and irradiates an image formed on the image forming means with illumination light, and this image is projected on a screen by a projection lens. And a projection display device for enlarging and projecting the image.

[0002]

2. Description of the Related Art In order to obtain a large screen image, a small image forming means for forming an optical image corresponding to a video signal is illuminated with light from a light source, and the optical image is projected on a screen by a projection lens. A projection display device that performs projection and enlargement is used. As an image forming unit, a liquid crystal panel that modulates light using polarized light in an active matrix system is widely and practically used.

For example, Japanese Patent Application Laid-Open No. Hei 3-111806 proposes two lens array plates each including a plurality of lenses as an illumination optical device for illuminating a liquid crystal panel with light from a light source. These two lens array plates divide a light beam incident on one of the lens array plates disposed on the light source side into a large number, superimpose each of the divided light beams on a liquid crystal panel, and illuminate efficiently and uniformly. It is.

[0004] For example, Japanese Patent Application Laid-Open No. Hei 8-304739 proposes an example of an illumination optical device of a projection display device using a liquid crystal panel using polarized light. this is,
A projection type, which uses a polarization splitting prism as a polarization splitting means and a half-wave plate as a polarization rotating means, and constitutes a polarization conversion optical member for converting natural light into light having one polarization direction. An object of the present invention is to improve the light use efficiency of a display device and increase the luminance.

FIG. 9 shows an example of a projection type display device incorporating a conventional illumination optical device. Radiation light from a discharge lamp 1 as a light source is condensed by a parabolic mirror 2 and converted into a substantially parallel light beam. Each parallel light beam enters the corresponding first lens array plate 3. The first lens array plate 3 is composed of a plurality of rectangular lens elements, and divides an incident light beam into a large number by each rectangular lens element. Focus on the lens.

[0006] Many minute light source images are formed on each lens element of the second lens array plate 4. The light emitted from the second lens array plate 4 enters the polarization conversion prism element 5. The polarization conversion prism element 5 separates natural light into two polarization directions and then converts the light into one-way polarized light. The second lens array plate 4 and the condensing lens 6 transmit the light flux from each lens element of the first lens array plate 3 to the liquid crystal panel 1.
Images are superimposed and formed on 9, 20, and 21. The light emitted from the condenser lens 6 is reflected by a mirror 8 and separated into three primary colors of green, red and blue by dichroic mirrors 9 and 10.
Some of the color lights are reflected by the reflection mirrors 11 to 13, respectively, and the liquid crystal panels 19, 20, and
21. In this way, a large number of split light beams are superimposed on the liquid crystal panel to perform uniform illumination.

[0007] The relay lenses 14 and 15 are for correcting the difference in the intensity of illumination light to each liquid crystal panel due to the difference in the illumination optical path length, which is the distance from the second lens array plate 4 to each liquid crystal panel. . Field lenses 16, 17,
Numeral 18 is for condensing illumination light to the liquid crystal panels 19, 20, and 21 on the pupil plane of the projection lens 23, respectively.

The three primary color lights of green, red and blue emitted from the liquid crystal panels 19, 20 and 21 are reflected by a dichroic prism 22.
After being combined by the above, the light enters the projection lens 23. The projection lens 23 projects the images of the liquid crystal panels 19, 20, and 21 on a screen (not shown) in an enlarged manner. With such a projection display device, a bright and uniform large-screen image can be obtained, and further higher brightness and smaller size are desired.

In order to reduce the size of the projection display device,
For example, there are a method of configuring a projection display apparatus using one image forming unit, and a method of reducing the size of the image forming unit and optical components. As a projection display device using one image forming unit, there is a projection display device that illuminates a liquid crystal panel in which each pixel has a blue, green, and red color filter with white light, and performs enlarged projection with a projection lens.

[0010] For example, in Japanese Patent Application Laid-Open No. 4-60538, a color filter is not formed, and corresponding color light is incident on each pixel of a liquid crystal panel to which blue, green, and red color signals are independently applied. There has been proposed a projection display apparatus using a liquid crystal panel on which a microlens to be arranged is arranged. In this device, white light from a light source is separated into blue, green, and red color lights by a dichroic mirror, and each color light is at a different angle,
The light enters the liquid crystal panel on which the microlenses are arranged. The image formed on the liquid crystal panel is enlarged and projected by the projection lens. A microlens having such an effect is hereinafter referred to as a color separation type microlens. If a color separation type microlens is used, there is no loss in a color filter, so that a bright projection display device can be configured. .

Further, as another image forming means, there is a projection type display apparatus using one digital micromirror device (DMD).

[0012]

However, the above-mentioned conventional projection display apparatus has the following problems.

FIG. 10 shows an illumination optical device used in the projection type display device shown in FIG. FIG. 10 shows a light beam that reaches a liquid crystal panel 19 after a part of the light beam emitted from the lamp 1 as a light source passes through the lens elements of the first and second lens array plates 3 and 4.

As shown in FIG. 1, the arc length of the discharge lamp is AL, the focal length of the parabolic mirror 2 is fp, the condensing angle of the parabolic mirror is α, and the liquid crystal is transmitted from the second lens array plate 4 to the liquid crystal. Panel 19
, The distance between the first lens array plate 3 and the second lens array plate 4 is z1, the second lens array plate 4, the first lens array plate 3, and so on. When the effective diameter of the parabolic mirror 2 is D, the angle of the light beam with respect to the optical axis is θ, the F number of the illumination light is F, and the size of the secondary light source image of the lens element of the second lens array plate 4 is ds. Approximately, the following equations are established.

Equation (1) F = １ ／ sin θ Equation (2) tan θ = D / 2z2 Equation (3) ds = z2 · g (α) · AL / 2mfp Equation (4) m = z2 / z1 Equation (5) g (α) = (1 + cos (α)) sin (α) where m is a magnification indicating a ratio of the outer shape of the lens element of the first lens array 3 to the outer shape of the liquid crystal panel 19, and g (α)
Is a function of the angle α between the focal point of the parabolic mirror 2 and any point on the parabolic mirror 2.

If the secondary light source image ds formed on each lens element of the second lens array plate 4 becomes larger than the lens element aperture or the aperture of the polarization conversion prism array element, light loss occurs. For this reason, in order to improve the light use efficiency of the illumination optical device and increase the brightness of the projection display device, it is necessary to reduce the secondary light source image and reduce the light loss.

On the other hand, as one of the techniques for increasing the brightness of the illumination optical device, there is a technique of increasing the light collection rate, which is the ratio of the light beam emitted from the concave mirror to the total light beam of the light source. In the example of FIG. 10, the brightness is increased by increasing the converging angle α of the parabolic mirror 2 and increasing the effective diameter D so that the light from the lamp 1 as the light source is condensed as much as possible. .

However, when the effective diameter D is increased,
There has been a problem in that the size of optical components such as a parabolic mirror, a lens array plate, and a mirror and the space in which these components are arranged are enlarged, and the size of the illumination optical device and the projection display device is increased.

In a parabolic mirror having a relatively small effective diameter, it is conceivable to shorten the focal length fp of the parabolic mirror in order to increase the converging angle α. As can be seen, when fp is shortened, there is a problem that the secondary light source image becomes large and the light loss becomes large. There is also a problem that the discharge lamp cannot be arranged because the discharge lamp contacts the parabolic mirror.

As another method of increasing the brightness, there is a method of reducing the F-number of the illumination optical device using a parabolic mirror having an effective diameter and a focal length capable of securing a constant light-collecting rate. In this method, as can be seen from Equations (1) to (5), if the illumination optical path length z2 is reduced, the F-number can be reduced and the secondary light source image can be reduced, so that the light utilization efficiency of the illumination optical device can be reduced. The brightness of the projection display device can be increased.

However, in this method, a dichroic mirror, a reflecting mirror,
There are restrictions on the arrangement of components such as the condenser lens and the first and second lens array plates.
In addition, there is a restriction on a necessary arrangement space for the second lens array plate. In other words, shortening the illumination optical path length z2, improving the light use efficiency of the illumination optical device, and achieving miniaturization are:
There was a problem that it was difficult due to physical restrictions.

On the other hand, when a projection type display device is configured by using a liquid crystal panel on which a color separation type micro lens array is arranged, the illumination light of each color of blue, green and red is applied to the micro lens array at different angles. It is configured to be incident.
The incident angle of the principal ray of each color light to the microlens is determined by the pixel pitch of the liquid crystal panel, the focal length of the microlens, and the like.
In this case, the F number of the illumination light requires a relatively large F number (for example, F7 or more). If the effective diameter D of the concave mirror of the illumination optical device is secured at a constant size to secure a necessary F-number in order to secure the light collection rate of the illumination mirror, the illumination optical path length z2 increases, and the projection display device increases in size. There was a problem.

The present invention solves the above-mentioned conventional problems, and includes a control lens for controlling an optical distance between an image forming means and a lens array plate, thereby reducing the size of the apparatus. It is an object of the present invention to provide an illumination optical device in which the light use efficiency is improved while achieving a higher efficiency, and a projection display device using the same.

[0024]

To achieve the above object, a first illumination optical device of the present invention condenses light from a light source and illuminates the condensed light on an image forming means. An illumination optical device, comprising: a light source; a light condensing means for condensing light emitted from the light source; and a plurality of lens elements for dividing light incident from the light condensing means into a number of light fluxes.
And a second lens array plate composed of a plurality of lens elements and receiving light from the first lens array plate, and receiving light from the second lens array plate and receiving the image A control lens for controlling an optical distance between a forming unit and the second lens array plate to be shorter than a physical distance between the image forming unit and the second lens array plate; It is characterized by having. According to the illumination optical device as described above, the optical path length for illumination can be optically controlled to be short while securing a physical distance for securing a space for disposing optical components. For this reason,
Since the F number and the secondary light source image can be reduced while the size of the illumination optical device is reduced, the light use efficiency of the illumination optical device is improved.

In the first illumination optical device,
Preferably, the control lens is a lens having a positive power.

Next, a second illumination optical device according to the present invention comprises:
An illumination optical device for condensing light from a light source and illuminating the condensed light on an image forming unit, comprising: a light source; a condensing unit for condensing light emitted from the light source; and a plurality of lenses. A first lens array plate composed of elements for dividing light incident from the condensing means into a large number of light fluxes, and a second lens array composed of a plurality of lens elements and receiving light from the first lens array plate. Light from the lens array plate and the second lens array plate is incident thereon, and the optical distance between the image forming unit and the second lens array plate is changed by the distance between the image forming unit and the second lens array plate. A control lens for controlling the distance to be longer than the physical distance between the lens and the lens array plate. According to the illumination optical device as described above, the illumination optical path length can be optically controlled to be long even if the physical illumination optical path length is short. For this reason, when illuminating light of a relatively large F number is required to constitute the projection display device, the size of the illumination optical device can be reduced while increasing the luminance.

In the second illumination optical device,
Preferably, the control lens is a lens having negative power.

In each of the illumination optical devices, the control lens preferably has an aspherical lens shape. As described above, if the lens has an aspherical shape, light transmitted around the lens can be effectively guided to the image forming unit.

Also, a polarization conversion optical member that receives light emitted from the second lens array plate and converts natural light into light in one direction of polarization is provided by the second lens array plate and the control lens. It is preferable to provide between. According to the illumination optical device as described above, since natural light can be converted into polarized light in one direction, light use efficiency can be improved,
High brightness can be achieved.

Next, a first projection type display device according to the present invention is a projection type display device using each of the illumination optical devices, wherein the white light from the illumination optical device is converted into blue, green and red light. A color separation optical unit that separates the light into light components of three color components; three image forming units that receive light of each color from the color separation optical unit and form an optical image in accordance with a video signal; Blue, green, and red, and a color synthesizing optical unit that synthesizes blue, green, and red color lights by receiving the emitted light, and a projection lens that projects an optical image of the image forming unit onto a screen. Features. According to the projection display device as described above, it is possible to improve the light use efficiency and increase the brightness while reducing the size of the device.

Next, a second projection type display device according to the present invention is a projection type display device using each of the illumination optical devices, wherein light from the illumination optical device is incident and responds to a video signal. It is characterized by comprising one image forming means for forming an optical image, and a projection lens for projecting the optical image of the image forming means on a screen. According to the projection display device as described above, it is possible to improve the light use efficiency and increase the brightness while reducing the size of the device. Also, since there is only one liquid crystal panel, a very small and low-cost projection display device can be configured.

Next, a third projection type display device according to the present invention is a projection type display device using each of the illumination optical devices, wherein the white light from the illumination optical device is converted into blue, green and red light. Color separation optical means for separating the light into the light of the color components; one image forming means for receiving light of each color from the color separation optical means to form an optical image according to a video signal; And a projection lens for projecting an image on a screen. According to the projection display device as described above, it is possible to improve the light use efficiency and increase the brightness while reducing the size of the device. Also, since there is only one liquid crystal panel, a very small and low-cost projection display device can be configured.

In the first to third projection display devices, it is preferable that the image forming means is a liquid crystal panel.

In the second projection display device, it is preferable that the image forming means is a liquid crystal panel having a color filter formed on the light source side.

In the third projection display device, the image forming means includes a microlens array for converging light for each of blue, green, and red color light to a corresponding pixel opening of the image forming means. It is preferable that the liquid crystal panel is formed. According to the projection display device as described above, since no color filter is formed, there is no loss in the color filter and a bright projection display device can be configured even when one liquid crystal panel is used.

[0036]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a configuration of an illumination optical apparatus according to Embodiment 1. The illumination optical device 38 shown in the figure uses a liquid crystal panel 40 that modulates light using polarized light as an image forming unit. The illumination optical device 38 includes a discharge lamp 30 that is a light source, a parabolic mirror 31 that is a condensing unit that condenses light from the discharge lamp 30,
First lens array plate 32, second lens array plate 3
3, a condenser lens 35, and a lens 37 for controlling the optical distance from the second lens array plate 33 to the surface of the liquid crystal panel 40, that is, the optical illumination optical path length. In this drawing, the number of lenses 37 is one, but a plurality of lenses may be used.

In the drawing, optical parameters are indicated by symbols, where AL is the arc length of the lamp 30, and fp is the parabolic mirror 3.
1 is the focal length, α is the converging angle of the parabolic mirror 31, D is the effective diameter of the second lens array plate 32, and z1 is between the first lens array plate 32 and the second lens array plate 33. The distance of z
Reference numeral 2 denotes a physical distance between the second lens array plate 32 and the liquid crystal panel 40, that is, a physical illumination optical path length. These optical parameters approximately satisfy the relations shown in the above equations (1) to (5).

Light emitted from a discharge lamp 30 such as a metal halide lamp, an ultra-high pressure mercury lamp, or a xenon lamp is condensed by a parabolic mirror 31 and converted into substantially parallel light. The light converted into the substantially parallel light is incident on a first lens array plate 32 composed of a plurality of lenses. First
The light beam incident on the lens array plate 32 is divided into a number of light beams. A large number of split light beams converge on a second lens array plate 33 composed of a plurality of lenses.

On the second lens array plate 33, a number of minute secondary light source images are formed. In the figure, a state of a secondary light source image 36 formed on one lens element 34 of the second lens array plate 33 is shown. First lens array plate 3
The focal length of the second lens element is the first lens array plate 3
Z1 which is the distance between the second lens array plate 33 and the second lens array plate 33
And The lens elements of the first lens array plate 32 have an opening shape similar to that of the liquid crystal panel 40.

The lens element 3 of the second lens array plate 33
4 denotes a first lens array plate 32 surface and a liquid crystal panel surface 40
The focal length is determined in consideration of the power of the lens 37 so that the two have a substantially conjugate relationship. The condenser lens 35 is a lens for superimposing and illuminating the light emitted from each lens element 34 of the second lens array plate 33 on the liquid crystal panel 40. A large number of light beams emitted from the second lens array plate 33 are collected by a condenser lens 35, a lens 37, and a field lens 3.
9, after being transmitted and refracted, is superimposed on the liquid crystal panel 40,
The light is uniformly illuminated on the liquid crystal panel 40 with high efficiency.

The field lens 39 focuses light illuminated on the liquid crystal panel 40 on a pupil plane (not shown) of the projection lens. The pupil plane of the projection lens and the second lens array plate 33 have a substantially conjugate relationship. FIG. 1 shows the appearance of a part of the light beam emitted from the lamp 30, which light beam reaches the liquid crystal panel 40 after passing through the lens elements of the first and second lens array plates 32 and 33. I have.

The lens 37 is a lens having the function of optically shortening the illumination optical path length while maintaining a certain physical illumination optical path length z2. The lens 37 is a lens having a positive power, and is disposed by utilizing a space between a dichroic mirror and a reflection mirror when configuring a projection display device. The light beam indicated by the broken line in FIG. 1 has an optical illumination optical path length z due to the arrangement of the lens 37.
2 'is shorter than the physical illumination optical path length z2. The focal length of the lens 37 is such that the optical illumination optical path length z2 'is shorter than the physical illumination optical path length z2, and
Lens element of first lens array plate 32 and liquid crystal panel 4
The second lens array plate 33 so that 0 has a conjugate relationship.
Focal length of the lens element, focal length of the condenser lens 35,
And the power of each optical element of the field lens 39 is determined.

As described above, optically shortening the illumination optical path length by the arrangement of the lens 37 is equivalent to shortening the physical illumination optical path length z2.
As can be seen from (2), θ increases, so that the F-number can be reduced. Further, the above formulas (3) to
As can be seen from (5), the secondary light source image can be reduced.
That is, by disposing the lens 37, the F-number can be reduced and the secondary light source image can be reduced.
Light loss on the lens array plate 33 can be reduced. In this case, even if the illumination optical path length is shortened optically, there is no change in the physical illumination optical path length, and thus the arrangement of optical components such as dichroic mirrors and reflection mirrors necessary for configuring the projection display device. Space is reserved.

Further, since the distance z1 between the first lens array plate 32 and the second lens array plate 33 can be shortened by optically shortening the illumination optical path length, the illumination optical device can be downsized. . Further, the F-number can be reduced without increasing the effective diameters D of the first and second lens array plates 32 and 33 and the parabolic mirror 31, so that the illumination optical device can be downsized.

The condensing lens 35 is a lens for illuminating the light emitted from each lens element of the second lens array plate 33 on the liquid crystal panel 40 in a superimposed manner. You may let it. In this case, the two lenses, the condenser lens 35 and the lens 37, can be constituted by one.

Although each lens element of the second lens array plate 33 has a rectangular shape, the aperture shape may be appropriately changed in order to improve light use efficiency.

Further, if the lens 37 is a lens having an aspherical shape, the light transmitted around the lens element can be effectively guided to the liquid crystal panel 40, and the light use efficiency can be improved. Further, if the lens 37 is made of resin, the weight and cost of the lens element and the illumination optical device can be reduced.

As described above, in the present embodiment, a physical illumination optical path length for securing an arrangement space for optical components such as dichroic mirrors and reflection mirrors necessary for configuring a projection display apparatus is secured. In addition, a lens for optically controlling the illumination optical path length is arranged. Therefore, the F-number and the secondary light source image can be reduced while the size of the illumination optical device is reduced, so that the light use efficiency of the illumination optical device is improved and the brightness of the projection display device is increased. Becomes possible.

(Embodiment 2) FIG. 2 shows a configuration of an illumination optical apparatus according to Embodiment 2. As the image forming means, a liquid crystal panel 58 that modulates light using polarized light is used. The illumination optical device 56 includes a discharge lamp 5 serving as a light source.
0, a parabolic mirror 51 which is a condensing means for condensing light from the discharge lamp 50, a first lens array plate 52, a second lens array plate 53, and a condensing lens 54. A field lens 57 for condensing light illuminated on the liquid crystal panel 58 on a pupil plane (not shown) of the projection lens.
Is provided. This configuration is the same as the configuration of the illumination optical device according to the first embodiment.

The illumination optical device according to the second embodiment differs from the illumination optical device according to the first embodiment in that the optical illumination optical path length from the second lens array plate 53 to the surface of the liquid crystal panel 58 is controlled to be long. This is the point that the lens 55 is arranged. In FIG. 2, the lens 55 has a single lens configuration, but may include a plurality of lenses.

The light emitted from the discharge lamp 50 is condensed by the parabolic mirror 51 and is converted into substantially parallel light. The light converted into the substantially parallel light is the first light that is composed of a plurality of lenses.
To the lens array plate 52. The light beam incident on the first lens array plate 52 is split into many light beams. A large number of split light fluxes form a second lens composed of a plurality of lenses.
Converge on the lens array plate 53. Many small secondary light source images are formed on the second lens array plate 53.

The focal length of the lens elements of the first lens array plate 52 is the distance z1 between the first lens array plate 52 and the second lens array plate 53. The lens elements of the first lens array plate 52 have an opening shape similar to that of the liquid crystal panel. The focal length of the lens elements of the second lens array plate 53 is determined in consideration of the power of the lens 55 so that the surface of the first lens array plate 52 and the surface of the liquid crystal panel 58 have a substantially conjugate relationship. . The condenser lens 54 is a lens for superimposing and illuminating light emitted from each lens element of the second lens array plate 53 on the liquid crystal panel 58.

A large number of light beams emitted from the second lens array plate 53 are transmitted and refracted through a condenser lens 54, a lens 55, and a field lens 57, and then superimposed on a liquid crystal panel 58. High efficiency and uniform illumination. The pupil plane of the projection lens and the second lens array plate 53 have a substantially conjugate relationship. FIG. 2 shows the appearance of a part of the light beam emitted from the lamp 50, which light beam reaches the liquid crystal panel 58 after passing through the lens elements of the first and second lens array plates 52 and 53. ing.

The lens 55 is a lens 55 having the function of optically extending the illumination optical path length while maintaining a certain physical illumination optical path length z2. The lens 55 is a lens having negative power. The light beam indicated by the broken line in FIG.
2 'is longer.

The focal length of the lens 55 is such that the optical illumination optical path length z2 'is longer than the physical illumination optical path length z2, and the lens element of the first lens array plate 53 and the liquid crystal panel 5
8 is in a conjugate relationship with the second lens array plate 5.
The focal length of the lens element 3, the focal length of the condenser lens 54, and the power of each optical element of the field lens 57 are determined.

Here, when a projection type display device is constructed using a liquid crystal panel on which a color separation type microlens array is arranged, the F number of the illumination light needs to be a relatively large F number (for example, F7 or more). . As described above, in the illumination optical device which is restricted by a relatively large F-number, the effective diameter D is set to a certain size in order to secure the condensing rate of the concave mirror of the illumination optical device. When this is defined, there is a problem that the illumination optical path length z2 becomes long and the projection display device becomes large. In the present embodiment, by arranging the lens 55, a certain length of the physical illumination optical path length z2 is ensured while maintaining a constant condensing rate of the concave mirror, that is, the physical illumination optical path length z2. Since the length of the illumination optical path can be increased optically without increasing the length, the size of the illumination optical device can be reduced.

As described above, in the present embodiment, the lens for controlling the illumination optical path length to be optically long even if the physical illumination optical path length is short is arranged. For this reason, when illumination light having a relatively large F number is required to constitute the projection display device, the illumination optical device and the projection display device can be downsized while increasing the luminance of the illumination optical device.

(Embodiment 3) FIG. 3 shows the configuration of an embodiment according to the first projection display apparatus. A liquid crystal panel that modulates light using polarized light is used as an image forming unit. The illumination optical device 77 includes a discharge lamp 70 as a light source, a parabolic mirror 71, and a first lens array plate 7.
2, a second lens array plate 73, a condenser lens 74, a reflecting mirror 75 for bending the optical path, and a lens 76 for controlling the optical illumination optical path length from the second lens array plate to the liquid crystal panel surface to be short. Have. In FIG. 3, the lens 76 has a single lens configuration, but may include a plurality of lenses.

The color separation optical means 80 includes a blue transmitting dichroic mirror 78 and a green reflecting dichroic mirror 7.
9.

Further, in this embodiment, the relay lens 8
1, 82, reflection mirrors 83, 84, 85, field lenses 86, 87, 88, liquid crystal panels 89, 90, 91 as image forming means, dichroic prism 94 as color synthesizing optical means, and projection lens 95. . The dichroic prism 94 includes a dichroic mirror 92 that reflects blue and a dichroic mirror 93 that reflects red.

The light emitted from the illumination optical device 77 enters the color separation optical means 80. The light incident on the color separation optical means 80 is separated into blue, green, and red color lights by a dichroic mirror 78 that reflects blue and a dichroic mirror 79 that reflects green. The green light passes through the field lens 86 and enters the liquid crystal panel 89. After the blue color light is reflected by the reflection mirror 85, it passes through the field lens 87 and enters the liquid crystal panel 90.

The red light is transmitted and reflected by the relay lenses 81 and 82 and the reflection mirrors 83 and 84, passes through the field lens 88, and then enters the liquid crystal panel 91. The three liquid crystal pallets 91, 92, and 93 are of an active matrix type, and modulate light by controlling a voltage applied to a pixel according to a video signal to form red, green, and blue images, respectively. The color lights transmitted through the liquid crystal panels 91, 92, and 93 are reflected by a dichroic prism 94 as a color combining optical unit, and blue and red color lights are reflected by a dichroic mirror 92 that reflects blue and a dichroic mirror 93 that reflects red, respectively. And is enlarged and projected by a projection lens 95 on a screen (not shown).

A lens 76 for optically shortening the illumination optical path length is disposed between the reflection mirror 75 and the blue transmitting dichroic mirror 78. The lens 76 has a positive power, the focal length is such that the optical illumination optical path length is shorter than the physical illumination optical path length, and the lens elements of the first lens array plate 72 and the liquid crystal panels 89, 90 , 91 have a conjugate relationship in consideration of the focal length of the lens element of the second lens array plate 73, the focal length of the condenser lens 74, and the power of each optical element of the field lens 86. I have.

Since the lens 76 is provided,
Since the illumination optical path length can be shortened optically, as described in the first embodiment, the F-number can be reduced and the secondary light source image can be reduced, and light at the lens element aperture on the second lens array plate 73 can be reduced. Loss can be reduced. Further, since the illumination optical path length can be shortened optically, the distance between the first lens array plate 72 and the second lens array plate 74 can be shortened, and the illumination optical device can be downsized. Further, the F-number can be reduced without increasing the effective diameters of the first and second lens array plates 72 and 74 and the parabolic mirror 71, and thus the illumination optical device can be downsized.

As described above, the projection display apparatus according to the present embodiment uses the illumination optical apparatus having the lens for optically controlling the illumination optical path length, so that the size of the projection display apparatus can be reduced. While improving the light use efficiency, it is possible to increase the brightness of the projection display device.

(Embodiment 4) FIG. 4 shows the configuration of an embodiment according to the second projection display apparatus. A liquid crystal panel that modulates light using polarized light is used as an image forming unit. The illumination optical device 108 includes a discharge lamp 100 as a light source, a parabolic mirror 101, and a first lens array plate 10.
2, the second lens array plate 103, the condenser lens 104,
A reflection mirror 105 for bending the optical path and a lens 106 for controlling the optical illumination optical path length from the second lens array plate 103 to the liquid crystal panel surface to be short are provided.
In this drawing, the lens 106 has a single lens configuration, but may include a plurality of lenses. The color separation optical unit 111 includes a dichroic mirror 109 that transmits blue light and a dichroic mirror 110 that reflects green light.

Further, in the present embodiment, the relay lens 11
2, 113, reflection mirrors 114, 115, 116, field lenses 117, 118, 119, liquid crystal panels 120, 121, 122 as image forming means, color combining optical means 125, and projection lens 126. The color synthesizing optical unit 125 includes the blue reflecting dichroic mirror 12.
3 and a red reflecting dichroic mirror 124.

The above configuration is the same as the configuration of the first projection display device. The present embodiment is different from the first projection display device in that an illumination optical device in which a polarization conversion optical member 107 is arranged between a second lens array plate 103 and a condenser lens 104 is provided. Is a point.

The polarization conversion optical member 107 is formed by arranging minute polarization separation prism arrays 130 as shown in FIG. 5 at a pitch of about 約 of the lens element pitch of the second lens array plate 103. The light incident on one polarization separation prism transmits P-polarized light through the polarization separation film 131,
S-polarized light is reflected.

The reflected S-polarized light is reflected by the adjacent reflection film 131.
And is reflected again, and enters the half-wave plate 132. The half-wave plate 132 sets the polarization direction of the incident light to 90.
It is arranged so as to rotate by ° and converts incident S-polarized light into P-polarized light. In this manner, natural light is converted into light in one polarization direction by the polarization conversion optical member 107, and the converted light enters the condenser lens 104.

The light emitted from the illumination optical device 108 enters the color separation optical means 111. Color separation optical means 111
Is incident on the dichroic mirror 10 which reflects blue light.
9. Blue, dichroic mirror 110
Separated into green and red light. The green color light passes through the field lens 117 and enters the liquid crystal panel 120. The blue light is reflected by the reflection mirror 116, passes through the field lens 118, and enters the liquid crystal panel 121. The red light is transmitted through the relay lenses 112 and 113 and the reflection mirror 1.
14 and 115 are transmitted and reflected to form the field lens 11.
After passing through No. 9, it enters the liquid crystal panel 122.

The three liquid crystal panels 120, 121, 122
Is an active matrix system, which modulates light by controlling a voltage applied to a pixel according to a video signal to form red, green, and blue images, respectively. Liquid crystal panels 120, 1
The color lights transmitted through 21 and 122 are reflected by a dichroic prism 123 which is a color combining optical means, and blue and red color lights are respectively reflected by a blue reflecting dichroic mirror 123 and a red reflecting dichroic mirror 124 to be combined with green color light. Then, the image is enlarged and projected on a screen (not shown) by the projection lens 126.

In the present embodiment, the polarization conversion optical member 107
, So that natural light is converted into one-way polarized light, greatly improving the light use efficiency of projection display devices.
High brightness can be achieved.

The lens 106 for optically controlling the illumination optical path length is disposed between the reflection mirror 105 and the blue transmitting dichroic mirror 109. The lens 106 has a positive power, the focal length is such that the optical illumination optical path length is shorter than the physical illumination optical path length, and the lens element of the first lens array plate 102 and the liquid crystal panels 120, 121, 1
The focal length of the lens element of the second lens array plate 103, the focal length of the condenser lens 104, and the power of each optical element of the field lens 117 are determined so that 22 has a conjugate relationship. .

Since the illumination optical path length can be shortened optically by disposing the lens 106, the first embodiment is used.
As described above, the F-number can be reduced, the secondary light source image can be reduced, and light loss at the lens element aperture on the second lens array plate 103 can be reduced. Further, since the illumination optical path length can be shortened optically, the first lens array plate 1
02 and the second lens array plate 103 can be shortened, and the illumination optical device can be downsized. Further, the first and second lens array plates 102 and 103 and the parabolic mirror 1
Since the F-number can be reduced without increasing the effective diameter of 01, the illumination optical device can also be downsized.

As described above, the projection type display device of the present embodiment has a configuration using the illumination optical device including the lens for optically controlling the illumination optical path length and the polarization conversion optical member. It is possible to greatly improve the light use efficiency while reducing the size of the projection display device, and to increase the brightness of the projection display device.

(Embodiment 5) FIG. 6 shows an embodiment relating to a third projection display apparatus. A liquid crystal panel that modulates light using polarized light is used as an image forming unit. The illumination optical device 148 includes a discharge lamp 140 as a light source, a parabolic mirror 141, and a first lens array plate 14.
2, a second lens array plate 143, a condenser lens 144,
It includes a reflection mirror 145 for bending the optical path, lenses 146 and 147 for controlling the optical illumination optical path length from the second lens array plate to the liquid crystal panel surface, and a dichroic mirror 149 for transmitting blue light. In this drawing, the number of lenses 146 and 147 is one, but a plurality of lenses may be used.

Further, in the present embodiment, the dichroic mirror 150 for reflecting green, the relay lenses 151 and 152,
The optical system includes reflection mirrors 153, 154, 155, field lenses 156, 157, 158, a projection lens 165, a dichroic prism 164, and liquid crystal panels 159, 160, 161 as image forming means. The dichroic prism 164, which is a color combining optical unit, includes a dichroic mirror 162 that reflects blue and a dichroic mirror 163 that reflects red. In the present embodiment, the arrangement positions of the lenses 146 and 147 for controlling the illumination optical path length to be short are different from those of the first and second projection display devices.

The light emitted from the second lens array plate 143 passes through the condenser lens 144 and is reflected by the reflection mirror 145. Then, the light is separated from green and red by a blue reflection dichroic mirror 149 which is a color separation optical unit. Color light and blue color light. The separated color lights are respectively incident on lenses 146 and 147 for optically controlling the illumination optical path length to be short and refracted.

The light emitted from the lens 146 is separated into green and red light by the green reflecting dichroic mirror 150, and the green light is transmitted through the field lens 156 and then enters the liquid crystal panel 159. Red color light is relay lens 1
After transmitting and reflecting through the field lenses 51 and 152 and the reflecting mirrors 153 and 154, and passing through the field lens 158, the liquid crystal panel 1
It is incident on 61.

On the other hand, the separated blue color light is
7, the light is reflected by the reflection mirror 155, passes through the field lens 157, and enters the liquid crystal panel 160. The three liquid crystal panels 159, 160, and 161 are of an active matrix type, and modulate light by controlling a voltage applied to a pixel according to a video signal to form red, green, and blue images, respectively.

The color lights transmitted through the liquid crystal panels 159, 160, and 161 are reflected by a dichroic prism 164, which is a color combining optical unit, so that the blue and red color lights are reflected by a dichroic mirror 162 that reflects blue and a dichroic mirror 163 that reflects red, respectively. Then, the light is combined with green light, and enlarged and projected on a screen (not shown) by the projection lens 165.

Lenses 146 and 147 for optically controlling the illumination optical path length are provided between the dichroic mirror 149 transmitting blue light and the dichroic mirror 150 reflecting green light, and between the dichroic mirror 149 transmitting blue light and the reflection mirror 155, respectively. Are located in It is arranged closer to the liquid crystal panel than the lens elements arranged in the first and second projection display devices. In such an arrangement, the number of lens elements increases, but the illumination optical path length can be controlled to be shorter than in the first and second projection display devices.

Further, since the reflection mirror 145 and the blue-transmitting dichroic mirror 149 can be arranged closer to each other, the size of the projection display device can be further reduced. Lens 14
6,147 has a positive power, the focal length is such that the optical illumination path length is shorter than the physical illumination path length, and
Of the lens array plate 142 and the liquid crystal panel 15
The focal length of the lens element of the second lens array plate 143, the focal length of the condenser lens 144, and the power of each optical element of the field lens 156 are taken into consideration so that 9, 160 and 161 have a conjugate relationship. I have decided.

Since the lenses 146 and 147 are disposed, the optical path length of the illumination can be shortened optically. Therefore, as described in the first embodiment, the F-number can be reduced and the secondary light source image can be reduced. Second lens array plate 143
Light loss at the upper lens element aperture can be reduced. Further, since the illumination optical path length can be shortened optically, the distance between the first lens array plate 142 and the second lens array plate 143 can be shortened, and the illumination optical device can be downsized. Further, the F-number can be reduced without increasing the effective diameters of the first and second lens array plates 142 and 143 and the parabolic mirror 141, and thus the illumination optical device can be downsized.

Note that a projection display device may be configured between the second lens array plate 143 and the condenser lens 144 using an illumination optical device having a polarization conversion optical member.

As described above, the projection display apparatus according to the present embodiment is an illumination optical apparatus having a lens for controlling the illumination optical path length optically shorter than the first and second projection display apparatuses. Because of this configuration, the size of the projection display device can be further reduced, the light use efficiency can be improved, and the brightness of the projection display device can be increased.

(Embodiment 6) FIG. 7 shows the configuration of an embodiment according to the fourth projection display apparatus. A liquid crystal panel 19 that modulates light using polarized light as an image forming unit
0 is used. The illumination optical device 187 includes a discharge lamp 180 as a light source, a parabolic mirror 181, a first lens array plate 182, a second lens array plate 183, a condenser lens 184, a reflection mirror 185 for bending an optical path,
And the liquid crystal panel 190 from the second lens array plate 183.
1 that controls the optical path length of the optical illumination up to the surface
86 is provided. In this drawing, the number of lenses 186 is one, but a plurality of lenses may be used.

Further, in this embodiment, the reflection mirror 18 is used.
8, a field lens 189, and a projection lens 191. The present embodiment differs from the first to third projection display devices in that the projection display device has one liquid crystal panel.

The light emitted from the illumination optical device 187 is reflected by a reflection mirror 188, and then reflected by a field lens 189.
And is incident on the liquid crystal panel 190. LCD panel 1
Blue, green, and red color filters are formed in each of the 90 pixels. The liquid crystal panel 190 is of an active matrix type, and modulates light by controlling a voltage applied to a pixel according to a video signal to form a color image. The color light transmitted through the liquid crystal panel 190 is enlarged and projected on the screen by the projection lens 191.

The lens 186 has a positive power, the focal length is such that the optical illumination optical path length is shorter than the physical illumination optical path length, and the lens element of the first lens array plate 182 and the liquid crystal panel 190 Are determined in consideration of the focal length of the lens element of the second lens array plate 183, the focal length of the condenser lens 184, and the power of each optical element of the field lens 189 such that

Since the lens 186 is arranged, the illumination optical path length can be shortened optically.
As described above, the F-number can be reduced, the secondary light source image can be reduced, and light loss at the lens element aperture on the second lens array plate 143 can be reduced.

Since the illumination optical path length can be shortened optically, the distance between the first lens array plate 182 and the second lens array plate 183 can be shortened, and the illumination optical device can be downsized. Further, the first and second lens array plates 18
The F-number can be reduced without increasing the effective diameters of 2, 183 and the parabolic mirror 181, so that the illumination optical device can be downsized.

In this embodiment, since there is only one liquid crystal panel, a very small and low-cost projection display device can be constructed. If a monochrome liquid crystal panel without a color filter is used for the liquid crystal panel, a projection display device with lower cost can be configured.

Note that a projection display device may be configured between the second lens array plate 183 and the condenser lens 184 using an illumination optical device having a polarization conversion optical member.

(Embodiment 7) FIG. 8 shows the configuration of an embodiment according to the fifth projection display apparatus. As the image forming means, a liquid crystal panel 212 using polarized light is used. The illumination optical device 206 includes a discharge lamp 2 as a light source.
00, parabolic mirror 201, first lens array plate 202,
A second lens array plate 203, a condenser lens 204, and a lens 205 for controlling the length of the optical illumination optical path from the second lens array plate 203 to the surface of the liquid crystal panel 212 to be long.
It has. In the figure, the lens 205 has a single lens configuration, but may include a plurality of lenses.

Further, in this embodiment, the red reflection,
Green and blue reflecting dichroic mirrors 208 and 20
7 and 209, and a color separation optical unit 210 and a field lens 211.

The liquid crystal panel 212 includes a glass substrate 220 on which the microlens array 221 is formed,
2. The liquid crystal layer 223 includes pixel openings 224B, 224G, and 224R corresponding to blue, green, and red video signals.

Θ is the irradiation angle of the illumination light to the liquid crystal panel 212, and represents the F number of the illumination light. φ indicates the angle between the optical axis of the green color light and the optical axes of the blue and red color light. In the detailed view of FIG. 8, a part of light rays (solid line) where light from the lamp reaches the pupil plane of the projection lens 213 and a light ray (dotted line) indicating the irradiation angle θ of the illumination light to the liquid crystal panel 212 are shown. Is shown.

The light emitted from the illumination optical device 206 enters the color separation optical means 210. Color separation optical means 210
Is incident on the dichroic mirror 20 which reflects red light.
8. The light is separated into red, green, and blue light by a dichroic mirror 207 that reflects green and a dichroic mirror 209 that reflects blue.

The red, green and blue color lights are transmitted through the field lens 21.
1 and is incident on the liquid crystal panel 212. Each color light incident on the liquid crystal panel 212 has an optical axis incident at an angle different by φ. The red, green, and blue color lights converge and enter the respective pixel openings 224R, 224G, and 224B of the liquid crystal panel 212 to which the red, green, and blue video signals are independently applied by the microlens array substrate 220. .

The liquid crystal panel 212 forms red, green, and blue images by controlling the voltage applied to each pixel in accordance with a video signal in an active matrix system. Each color light transmitted through the liquid crystal panel is enlarged and projected on the screen by the projection lens 213.

In this embodiment, since no color filter is formed, there is no loss of the color filter, and a bright projection display device can be constructed even when one liquid crystal panel is used. The angle φ formed by the red, green, and blue color lights incident on the color separation type microlens array 221 is determined by the liquid crystal panel 21.
Although it is determined by the pixel pitch of 2 and the focal length of the micro lens 221, in the present embodiment, the angle is set to about 8 degrees.

The micro lens 221 has a pixel aperture 224
R has a width corresponding to the width of R, 224G, and 224B, and the microlens array plate 220 has a shape of a lenticular lens. The microlens is formed on a transparent substrate by an ion exchange method or the like. Since the angle φ is about 8 degrees, the irradiation angle θ of the illumination light of each color light is 4 degrees or less. For this reason,
The F-number of the illumination light of each color light is 7 or less and the liquid crystal panel 21
2 need to be illuminated uniformly.

As described above, in the illumination optical device which is restricted to a relatively large F-number, in order to secure the condensing rate of the concave mirror of the illumination optical device, the effective diameter D is set to a certain size, and the required illumination is adjusted. When the optical F-number is defined, there is a problem that the illumination optical path length becomes long and the projection display device becomes large. Therefore, in the illumination optical device according to the present embodiment,
Even when the physical illumination optical path length is configured to be short, a lens 205 that optically controls the illumination optical path length to be long is provided.

The lens 205 has negative power, the focal length of the lens 205 controls the optical illumination optical path length to be longer than the physical illumination optical path length, and the first lens array plate 2
The focal length of the lens element of the second lens array plate 203, the focal length of the condenser lens 204, and the power of each optical element of the field lens 211 are set so that the lens element 02 and the liquid crystal panel 212 have a conjugate relationship. Decided taking into account.

As described above, in the present embodiment, since the lens for optically controlling the illumination optical path length is arranged, even when the F-number of the illumination light is relatively large, the liquid crystal panel and the second lens are connected to each other. The physical distance from the lens array plate can be shortened, and the size of the illumination optical device can be reduced. In addition, since a projection display device is configured using a liquid crystal panel on which one color separation type microlens array is formed, a bright, extremely small, and low-cost projection display device can be configured.

In each of the above embodiments, an example is shown in which a liquid crystal panel using polarized light is used as the image forming means. However, the image forming means for forming an optical image corresponding to a video signal as a change in reflection, scattering, or the like. A reflection type liquid crystal panel, a digital micromirror device (DMD), or a polymer dispersed liquid crystal panel may be used.

Further, a rear projection type display device may be constituted by using a transmission type screen.

[0111]

As described above, according to the present invention, by providing a lens for controlling the optical illumination optical path length to be shorter or longer than the physical illumination optical path length, the light from the light source can be reduced in size. Can be realized very efficiently and uniformly to the image forming means. In addition, a compact projection display device with high light use efficiency and a high brightness can be configured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an illumination optical device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of an illumination optical device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a projection display device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a projection display apparatus according to a fourth embodiment of the present invention.

5 is a configuration diagram of the polarization conversion optical member shown in FIG.

FIG. 6 is a configuration diagram of a projection display apparatus according to Embodiment 5 of the present invention.

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

FIG. 8 is a configuration diagram of a projection display apparatus according to a seventh embodiment of the present invention.

FIG. 9 is a configuration diagram of an example of a conventional projection display device.

FIG. 10 is a configuration diagram of an example of a conventional illumination optical device.

[Explanation of symbols]

30, 50, 70, 100, 140, 180, 200
Lamps 31, 51, 71, 101, 141, 181, 201
Parabolic mirrors 32, 52, 72, 102, 142, 182, 202
First lens array plate 33, 53, 73, 103, 143, 183, 203
Second lens array plate 34 Lens element of second lens array plate 35, 54, 74, 104, 144, 204 Condensing lens 36 Secondary light source image 37, 55, 76, 106, 146, 147, 186,
205 Lens for controlling illumination optical path length 38, 56, 77, 108, 148, 187, 206
Illumination optical device 39, 57, 86, 87, 88, 117, 118, 11
9, 156, 157, 158, 189, 211 Field lens 40, 58, 89, 90, 91, 120, 121, 12
2,159,160,161,190,212 Liquid crystal panel 75,105,145,185,188 Reflecting mirror 78,109 Blue transmitting dichroic mirror 79,110,207 Green reflecting dichroic mirror 80,111,210 Color separation optics Means 81, 82, 112, 113, 151, 152 Relay lens 83, 84, 85, 114, 115, 116, 153
154, 155 Reflecting mirrors 92, 123, 162, 163, 209 Blue reflecting dichroic mirrors 93, 124, 163, 208 Red reflecting dichroic mirrors 94, 125, 164 Dichroic prisms 95, 126, 165, 191, 213 Projection lens 107 Polarization conversion optical member 130 Polarization separation prism 131 Polarization separation film 132 Reflection film 133 波長 wavelength plate 220 Micro lens substrate 221 Micro lens 222 Glass substrate 223 Liquid crystal layer 224B, 224G, 224R Pixel aperture

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/74 H04N 9/31 C 9/31 G02F 1/1335 530 F-term (Reference) 2H088 EA13 EA14 EA15 HA12 HA13 HA20 HA24 HA25 HA28 MA20 2H091 FA02Y FA02Z FA10Z FA14Z FA26X FA26Z FA29Z FA41Z FD01 FD06 LA11 MA07 5C058 AA06 EA02 EA12 EA33 EA51 5C060 BA09 BC05 GB05 HC09 HC19 HC21 HD02 JB06 5G435 AAGG DD12

Claims (12)

[Claims] 1. An illumination optical device for condensing light from a light source and illuminating the condensed light on an image forming means, comprising: a light source; and a condensing means for condensing light emitted from the light source. A first lens array plate composed of a plurality of lens elements and dividing the light incident from the light condensing means into a large number of light beams, and a light composed of a plurality of lens elements and emitted from the first lens array plate. An incident second lens array plate, and light from the second lens array plate incident thereon, and the optical distance between the image forming unit and the second lens array plate is determined by the image forming unit. An illumination optical device, comprising: a control lens that controls the distance to be shorter than a physical distance between the control lens and the second lens array plate. 2. The illumination optical device according to claim 1, wherein the control lens is a lens having a positive power. 3. An illumination optical apparatus for condensing light from a light source and illuminating the condensed light on an image forming means, comprising: a light source; and a condensing means for condensing light emitted from the light source. A first lens array plate composed of a plurality of lens elements and dividing the light incident from the light condensing means into a large number of light beams, and a light composed of a plurality of lens elements and emitted from the first lens array plate. An incident second lens array plate, and light from the second lens array plate incident thereon, and the optical distance between the image forming unit and the second lens array plate is determined by the image forming unit. An illumination optical device, comprising: a control lens for controlling the distance to be longer than a physical distance between the first lens array plate and the second lens array plate. 4. The illumination optical device according to claim 2, wherein the control lens is a lens having a negative power. 5. The illumination optical device according to claim 1, wherein the lens shape of the control lens is an aspherical surface. 6. A polarization conversion optical member that receives light emitted from the second lens array plate and converts natural light into light in one polarization direction, comprising: a second lens array plate; the control lens; The illumination optical device according to any one of claims 1 to 5, wherein the illumination optical device is provided between. 7. A projection display device using the illumination optical device according to claim 1, wherein the white light from the illumination optical device is light of blue, green, and red color components. Color separation optical means for separating light into three colors, three image forming means for receiving light of each color from the color separation optical means and forming an optical image in accordance with a video signal, blue, green, and A projection display device comprising: a color synthesizing optical unit that synthesizes blue, green, and red light beams by receiving red emission light; and a projection lens that projects an optical image of the image forming unit onto a screen. 8. A projection display device using the illumination optical device according to claim 1, wherein light from the illumination optical device is incident and forms an optical image in accordance with a video signal. A projection display device comprising: one image forming unit; and a projection lens that projects an optical image of the image forming unit on a screen. 9. A projection display device using the illumination optical device according to claim 1, wherein the white light from the illumination optical device is light of blue, green, and red color components. Color separation optical means, one image forming means on which light of each color from the color separation optical means enters to form an optical image according to a video signal, and an optical image of the image forming means on a screen A projection display device comprising a projection lens for projecting. 10. The projection display according to claim 7, wherein said image forming means is a liquid crystal panel. 11. The projection display according to claim 8, wherein the image forming means is a liquid crystal panel having a color filter formed on the light source side. 12. The liquid crystal panel according to claim 9, wherein the image forming unit is a liquid crystal panel in which a microlens array that converges light for each of blue, green, and red color light to a corresponding pixel opening of the image forming unit. The projection type display device according to the above.