JPH06202094A - Projection type display device - Google Patents

Abstract

PURPOSE:To realize the video display which is brighter and higher in grade than heretofore by using a projection lens of a short back focus in a projection optical system for which an integrator illumination system is used. CONSTITUTION:The luminous flux radiated from a light source lamp 101 is reflected by a reflection mirror 102 and is separated by a dichroic mirror 103 into two luminous fluxes. A liquid crystal panel 114 is illuminated by these separated luminous fluxes by the integrator consisting of first lens groups 104, 105 and second lens groups 108, 109 in the respective optical paths. The luminous fluxes modulated by the liquid crystal panel 114 are synthesized by a cube prism 115 and video is projected and displayed by the projection lens 116.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a projection type display device for enlarging and displaying an image of a liquid crystal panel for performing light flux modulation on a screen.

[0002]

2. Description of the Related Art A problem of a liquid crystal projector for projecting and displaying an image on a liquid crystal panel is to use light from a light source with high efficiency. The liquid crystal projector currently in practical use has a total efficiency of only about 1 lm / W, and consumes a large amount of power in order to secure brightness.

As one means for improving efficiency, for example, CONFERENCE RECORD OF THE
1991 INTERNATIONAL DISPLA
Use of an integrator such as that shown on YCONFERENCE 151-154 is contemplated. The details of this structure are described in Japanese Patent Laid-Open No. 3-111806.

This integrator is, in principle, the same as that used in an exposure machine, in which a parallel light flux from a light source is divided by a plurality of rectangular lenses, and an image of each rectangular lens is one-to-one mapped to each rectangular lens. It is to superimpose an image on the liquid crystal panel with a corresponding relay lens. In this method, the light source luminous flux is cut out in a similar shape to the liquid crystal panel,
Since the cut-out luminous flux irradiates the liquid crystal panel without exception, the illumination efficiency is improved, and the above-mentioned CONFERENCE R
ECORD reports about 30% improvement in efficiency.
Further, since the cut-out light fluxes are superposed on each other, unevenness in illuminance and unevenness in color on the screen are significantly reduced.

[0005]

However, the use of the integrator is, as described in the above-mentioned Japanese Patent Laid-Open Publication, "the numerical aperture of the projection lens system becomes too large, so that the leftmost one is not suitable in practice. Absent". That is, since the apparent light source becomes large and the parallelism of the luminous flux deteriorates, a considerably large projection lens is required to project and use all the luminous flux incident on the liquid crystal panel.

When the liquid crystal panel is a system for modulating polarized light, a polarizing film is usually used to discard more than half of the light from the light source.
There is a method of using all the light from a light source by using a polarization conversion element composed of a polarization beam splitter and a ½ wavelength plate, as shown in '90 PROCESSEDINGS pages 64-67. It is of course possible to use this polarization conversion element and the integrator together, but in reality, the size of the integrator is doubled, so that a projection lens having a larger numerical aperture is required, which is not a very preferable method.

When the liquid crystal panel is an active matrix panel having a switching element in each pixel, SID 9 is a method for improving the effective aperture ratio of the panel.
2DIGEST, as shown on pages 269-272,
A method of mounting a microlens array on the light-incident side of a liquid crystal panel has been reported. The method using the microlens array is a very effective method because if the parallelism of the incident light beam is good, the light beam utilization efficiency can be increased up to about double. However, in the method using the integrator described above, since the parallelism of the illumination light flux is extremely poor, the use of the microlens has almost no effect.

Therefore, the present invention solves such a problem, and an object of the present invention is to achieve a high-quality and bright display in a projection optical system using an integrator without requiring a large projection lens. Is to
Another object of the present invention is to provide a projection display device which is brighter and has high light utilization efficiency by further adding an optical element.

[0009]

A projection display device according to the present invention includes an illuminating device, color light separating means for separating a light flux from the illuminating device into three primary color lights, and image data is obtained by modulating each primary color light. A plurality of modulators are included in the optical path from the illuminating device to the modulator, which includes a modulator included therein, a color light combiner for combining the modulated lights, and a projection optical system for projecting and displaying the combined light flux on the screen. A plurality of secondary light sources are formed by using the above lens, and a plurality of illumination optical systems for irradiating the modulation means are arranged by disposing the same number of lenses at positions where the secondary light sources can be formed. Characterize.

Further, the projection display apparatus according to the present invention includes an illuminating device, a color light separating means for separating a light beam from the illuminating device into two light beams, and two modulating means for modulating each color light to include image information. A color light synthesizing means for synthesizing the respective modulated lights, and a projection optical system for projecting and displaying the synthesized light flux on the screen, and a plurality of lenses are provided in the optical path from the illuminating device to the color light separating means. It is characterized in that a plurality of secondary light sources are formed by using them, and an illumination optical system for irradiating the modulating means is arranged by arranging the same number of lenses at positions where the secondary light sources can be formed.

Further, the projection display device of the present invention is such that an illuminating device, a modulating means for modulating polarized light contained in the luminous flux from the illuminating device to contain image information, and the modulated luminous flux is projected and displayed on a screen. A projection optical system is included, and a plurality of secondary light sources are formed by the first lens group formed of a plurality of rectangular lenses in the optical path from the illumination device to the modulator, and the same number of lenses are formed. An integrator illumination optical system for irradiating the modulation means is arranged by arranging a second lens group constituted by the above at a position of the secondary light source, and further, an illuminator side / second lens of the first lens group. By disposing, on the group side, polarized light separating means for directionally separating two polarized light beams included in the light flux from the illuminating device and orthogonal to each other at an angle of 90 degrees or less, each polarized light beam is separated on the second lens group. Forming a double secondary light source images to respond,
A phase difference plate is arranged at one or both of the secondary light source positions to convert the polarization direction, and a light flux with a uniform polarization direction is emitted from the second lens group to illuminate the modulator. And

Further, the projection display device according to the present invention comprises an illuminating device, a modulating means for modulating a light beam from the illuminating device to contain image information, and a projection optical system for projecting and displaying the modulated light beam on a screen. A plurality of secondary light sources are formed by the first lens group formed of a plurality of rectangular lenses in the optical path from the lighting device to the modulation means, and a plurality of secondary light sources are formed by the same number of lenses. An integrator illumination optical system for irradiating the modulation means by arranging two lens groups at the position of the secondary light source is arranged, and the modulation means is a liquid crystal panel in which a switching element is formed in each pixel, On the light flux incident side of this liquid crystal panel,
A microlens array is arranged.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A projection display device according to the present invention will be described in detail below with reference to the drawings.

(Embodiment 1) FIG. 1 shows the configuration of a projection type display device of the present invention. The light source lamp 101 is a light source close to a point, such as a halogen lamp, a metal halide lamp, and a xenon lamp, and the emitted light flux is reflected by the reflecting mirror 102 and becomes a nearly parallel light flux. The light flux is transmitted by the blue-green reflection dichroic mirror 103, the red light is transmitted, and the green light and the blue light are reflected. The red light flux is then sequentially reflected by the double-sided total reflection mirror 106 and the total reflection mirrors 110 and 111, and reaches the liquid crystal panel 114 via the condenser lens 113. The green light is reflected by the total reflection mirror 107, then by the green reflection dichroic mirror 112, further by the double-sided total reflection mirror 106, and reaches the corresponding liquid crystal panel 114 via the condenser lens 113. The blue light is reflected by the total reflection mirror 107, transmitted through the green reflection dichroic mirror 112 and reflected by the total reflection mirror 117, passes through the condenser lens 113 like other color lights, and then passes through the liquid crystal panel 1.
It is incident on 14. The three liquid crystal panels 114 modulate respective color lights and include image information corresponding to each color.
The cube prism 115 combines the modulated light fluxes, and includes a red-reflecting dielectric multilayer film and a blue-reflecting dielectric multilayer film in a cross shape. The combined light flux passes through the projection lens 116 to form an image on the screen.

The integrator illumination system is arranged for each light beam split by the blue-green reflective dichroic mirror 103. The red light flux includes a first lens group 104 and a second lens group 10 before and after the double-sided total reflection mirror 106.
On the other hand, for the green light flux and the blue light flux, the first lens group 105 and the second lens group 10 are provided before and after the total reflection mirror 107.
Place 9 It is important that a total reflection mirror is provided between each lens group. A configuration in which a dichroic mirror is inserted between each lens group is also possible, but in this case, since a light beam with a different incident angle is incident on the dichroic mirror, there is a large color unevenness on the display screen due to the angle dependence of the dielectric multilayer film. Occur. In addition, with the arrangement as shown in FIG. 1, the substantial working distance becomes equal to the distance between the second lens groups 108 and 109 and the liquid crystal panel 114, which is half that in the case without the integrator. . In fact, the utilization efficiency of the luminous flux is about twice as high as that without the integrator, and the display unevenness is almost eliminated.

FIG. 2 shows a specific configuration of the integrator illumination system.
It shows in (A). In order to reflect the light flux emitted from the light source lamp 101 inward, the reflecting mirror 102 has an elliptical shape. The light rays reflected near the rim of the reflecting mirror 102 travel toward the second focal point set at a distance a from the rim, so that the first lens group 104 and the second lens group 108 are reflected near the rim. It is efficient to arrange it so that it is inscribed exactly in the ring-shaped light beam. Since the rectangular lenses forming the first lens group 104 and the second lens group 108 are not decentered, the light beams are superposed at the position of the second focal point as they are. Therefore, the field lens 202 is arranged immediately after the second lens group 108 so as to be superimposed and illuminated on the liquid crystal panel 114. The size of the second lens group 108 is determined by the F value of the projection lens and the distance b between the second lens group 202 and the liquid crystal panel 114. If the F value of the projection lens is f, the second lens group 10
The size of 8 is designed to be smaller than b / f. The condenser lens 113 is for efficiently collecting the light flux that enters the liquid crystal panel 114 at the entrance pupil of the projection lens, and is designed to have a focal length smaller than b.

FIG. 2B is a diagram showing the structure of the first lens group 104 or the second lens group 108. Here, since the optical path cross section of the optical configuration in FIG. 1 is rectangular, the overall shape is rectangular. The rectangular lens 203 has a shape similar to that of the liquid crystal panel 114, and the illuminance distributions on the rectangular lenses of the first lens group 104 are superimposed on the panel.

In the present projection optical system, since the back focus of the projection lens 116 is short, it is possible to easily design a large numerical aperture while keeping the size of the projection lens small, and to maximize the effect of the integrator. it can. In addition, the light source lamp 101 and the first lens group 104, 1
Since there is a certain distance between 05, the illuminance distribution on each rectangular lens of the first lens group has a gentle distribution to some extent, and the illuminance distribution superimposed on the liquid crystal panel 114 includes the light source lamp 101. The display quality is very good because there is no concern about the shadows appearing.

(Embodiment 2) FIG. 3A shows the configuration of the projection type display device of the present invention. The light flux emitted from the light source lamp 101 is reflected by the reflecting mirror 102 and then passes through an integrator composed of the first lens group 104 and the second lens group 108. Then green reflective dichroic mirror 3
By 01, the white light flux is split into a green light flux and a magenta light flux. Each luminous flux is a total reflection mirror 302, 1
The light is reflected by 17, and enters the liquid crystal panels 114a and 114b through the condenser lens 114. Then, the modulated light flux is combined by the dichroic prism 303 which combines the green light flux and the magenta light flux, and is projected and displayed by the projection lens 116.

In this structure, since there are two liquid crystal panels, it is necessary to provide a color filter on one panel to separately modulate two colors. FIG. 3B shows the liquid crystal panel 11
It is the figure which showed the pixel structure of 4b. Red transmission filter 3
04 and blue transmission filters 305 are alternately arranged.

In this structure, since only two liquid crystal panels are used, the structure of the optical system is much simpler than that of the first embodiment. Moreover, since one liquid crystal panel is used for green light, there is almost no deterioration in resolution.
Also, the brightness of the projected image is almost determined by the brightness of green, so the brightness is not so bad. Therefore, there is no problem in using such a simple configuration when displaying a normal image except when three colors are required for one pixel like a computer screen.

However, the color reproducibility is not sufficient, and the red and blue colors are insufficient. Therefore, the spectrum configuration of the light source lamp may be adjusted so that the red and blue colors are emitted more than usual. . For example, in a three-wavelength emission type metal halide lamp, a halide corresponding to each primary color light is added, but in the currently practical one, there is one in which a halide of lithium, thallium or indium is enclosed. In this case, since lithium corresponds to red and indium corresponds to blue, it may be added in a larger amount than usual.

The currently used metal halide lamps for displaying images have a common problem that the red color tends to be insufficient. Therefore, as another configuration of FIG.
A method of using one liquid crystal panel for the red light flux and modulating the green light flux and the blue light flux with a common panel can be considered. In general projection display devices, the method of reducing green is used to compensate for the lack of red, but this does not require reduction of green because the red is sufficiently obtained, and the projected image has almost the same light intensity. Becomes

In the projection display apparatus of this configuration, as in the case of the first embodiment, the back focus of the projection lens is short, so that the projection lens can be designed small even though an integrator is used, and the overall configuration is very small. It's simple. Also, the resolution and brightness are not so inferior to those of the first embodiment, and are very suitable for normal image display.

(Embodiment 3) In liquid crystal projectors that are currently in practical use, liquid crystal panels of the type that modulate polarized light are all used. Therefore, half of the unpolarized light emitted from the light source lamp is absorbed by the polarizing plate and converted into heat, which causes a problem in the reduction of light utilization efficiency and the necessity of cooling for suppressing heat generation of the polarizing plate. .

A method of adding a polarization conversion system to the illumination optical system of the integrator and utilizing all the luminous flux from the light source will be described. FIG. 4A is a schematic configuration diagram showing the principle. Basically, it is the same as the normal integrator illumination system previously shown in FIG. 2A, but here, the first
A polarization separator is arranged immediately before the lens group 104, and a retardation plate 405 is arranged immediately after the second lens group 108.

The non-polarized light emitted from the light source lamp 101 is reflected by the parabolic reflector 401 and becomes a substantially parallel luminous flux. This collimated light enters the polarization splitter 402,
Two polarized lights having a relationship orthogonal to each other are directionally separated at a constant angle θ. The first lens group 10 arranged immediately after that
After passing 4, the luminous flux is collected near the focal position of each rectangular lens, that is, inside the corresponding rectangular lens of the second lens group 108, and a spot of the secondary light source is formed. Normally, only one spot is formed at the center of each rectangular lens, but here, two spots are formed corresponding to each polarized light. These light fluxes then pass through the phase difference plate 4
The polarization directions are aligned by passing through 05. Then, as in the case of a normal integrator, the light flux is collected at the center of the liquid crystal panel 114 by the field lens 202 and illuminates the inside of the rectangle of the liquid crystal panel substantially uniformly. Therefore, in principle, all the luminous fluxes from the light source lamp enter the liquid crystal panel 114.

An example of the structure of the polarization separator 402 is shown in FIG. The liquid crystal layer 407 is sandwiched between a prism substrate 406 having a sawtooth groove and a glass substrate 408. Since the liquid crystal molecules are oriented parallel to the grooves of the prism substrate 406, the light flux that is incident vertically on the substrate is divided into extraordinary light and ordinary light for the liquid crystal molecules, and is directionally separated. Now, it is assumed that the unpolarized light 409 that is incident on the flat surface of the prism substrate 406 substantially perpendicularly is incident on the inclined surface of the prism substrate 406 at an angle α. When the refractive index n _{0 of the} liquid crystal molecules with respect to the ordinary ray is equal to the refractive index of the prism substrate 406, the ordinary ray 410 goes straight without being refracted by the inclined surface, and the extraordinary ray 411 is refracted to form an angle θ with respect to the traveling direction of the ordinary ray. Get stuck. Here, when the refractive index of extraordinary light is n ₁ , the following equation approximately holds.

Α≈arctan {sin θ / (cos θ
-N ₀ / n ₁ )} If the prism substrate 406 is made of PMMA, the refractive index becomes about 1.48, and therefore the ordinary refractive index of the liquid crystal can be selected to be almost the same. The larger the liquid crystal refractive index difference, the more the angle θ
And a refractive index difference of about 0.25 is commercially available. When a metal halide lamp is used, the incident light flux is generally distributed up to about ± 5 ° with respect to the chief ray, but it can be distributed up to about ± 3 ° by devising the optical system using a lamp with a short arc length. Can be suppressed. Therefore, the minimum separation angle θ of polarized light is 6 °
If so, both polarized lights can be completely separated, and if these values are substituted into the above equation to obtain α, it becomes 37 °. Therefore, since the angle formed by the flat surface and the inclined surface of the prism substrate 406 is also about 37 °, it can be easily manufactured using an organic substance such as polymethylmethacrylate or polycarbonate.

Actually, as shown in FIG. 4B, the light is incident on the prism substrate at a constant angle β.
By doing so, the principal ray of the entire polarized-light separated light flux becomes perpendicular to the polarized light separator, which facilitates the configuration of the entire optical system. The angle β is equal to θ / 2, and when the angle θ is 6 °, β becomes 3 °, so that it is actually necessary to slightly tilt the light source.

In terms of efficiency, it is better to match the refractive index of extraordinary light with that of the prism substrate 406. In this method, the ordinary ray 410 is refracted, but the ordinary ray 410 is p-polarized with respect to the inclined surface of the prism substrate 406,
Moreover, the incident angle at the interface is close to Brewster's angle,
The reflection loss can be suppressed to 1% or less. Therefore, if a non-reflective coating is applied to the interface with air using this method, the luminous flux transmittance can theoretically be 97% or more.

Although the polarization separator shown in FIG. 4B is made of liquid crystal here, it is possible to make it using an organic film in principle. If the plate is pressed to form sawtooth grooves, it can be manufactured at low cost and is considered to be thermally stable. Also, a polarization separator that is thermally stable can be obtained even if a monomer is aligned instead of liquid crystal and polymerized by ultraviolet rays or heat.

In a normal integrator that does not use a polarization separator, at the center of each rectangular lens of the second lens group 108,
A light source image is formed. When the angle distribution of the light source light is within θ degrees and the distance between the first lens group 104 and the second lens group 108 is L, the light source images are as shown in FIG. 5 (A). It is formed in a circle having a diameter θL at the center of the rectangular lens. As shown in the figure, it is not always completely contained in the rectangular lens, but it is usually designed to be inscribed in order to improve the utilization efficiency of the light flux.

In this figure, the aspect ratio of the rectangular lens is drawn at 9:16 in consideration of the case of high-definition, but there are considerable spot-free areas on both sides of the rectangular lens 501. Therefore, the present invention uses this space to perform polarization conversion. In the present configuration, the second lens group 108 is used.
As shown in FIG. 5 (B), two spots corresponding to both polarized lights are formed on each rectangular lens. Since the distance between both spots is equal to the spot diameter θL, they are just separated as shown in the figure, and fit within the rectangular lens. Of course, this is limited to the case where the aspect ratio is 9:16, and when the normal aspect ratio is 3: 4,
The spot diameter needs to be somewhat smaller than the inscribed area of the rectangular lens 501.

In FIG. 5B, the spot 50 of each polarized light is shown.
Phase retarders 506 and 505 are arranged in stripes corresponding to Nos. 3 and 504. This phase difference plate 505, 506
There may be cases in which the polarized lights are rotated by 45 degrees to align the directions, or only one of the retardation plates is used and the polarization directions are rotated by 90 degrees using the half-wave plate to align the directions. It should be noted that this phase plate has the second lens group 108 and the field lens 20 as already shown in FIG.
Since it can be sandwiched between the two, the reflection loss due to the interface can be eliminated by adhering.

(Embodiment 4) Next, a method of further improving light utilization efficiency by using a microlens array in an optical system using an integrator will be described.

FIG. 6 is a block diagram showing the principle of illumination in the projection type display device of the present invention. In the figure, the configurations of the light source side and the projection lens side are omitted, but basically the configuration shown in FIG.
In the configuration shown in FIG. 2A, a cylindrical microlens array 601 is arranged between the liquid crystal panel 114 and the condenser lens 113 shown in FIG. The liquid crystal panel 114 is uniformly illuminated by the light source light that has passed through the second lens group 108 and the field lens 202, and the luminous flux distribution at the field lens 202 serves as an apparent light source, that is, a secondary light source.

The microlens array 601 adhered to the surface of the liquid crystal panel 114 has a structure in which a plurality of cylindrical lenses whose directions are aligned in the column direction of the pixels arranged in a matrix in the liquid crystal panel 114 are arranged. That number corresponds to the number of columns. The light flux that has passed through one cylindrical lens of the microlens array 601 passes through the counter substrate 602 and forms an image of a secondary light source on the liquid crystal layer 604. The shape of the secondary light source is a shape aligned in the vertical direction as shown in FIG. 5A or 5B, and there is a constant interval in the horizontal direction. Therefore, the image of the secondary light source formed on the liquid crystal layer is a stripe image in the column direction. Since each light flux of the stripe passes through the black stripes 603 between the pixels by stitching,
When the microlens array 601 is not provided, the efficiency is improved by the amount of light shielded by the black stripe 603. The black stripes 603 prevent the switching transistors formed in one-to-one correspondence with each pixel from being exposed to light and deteriorating the performance. Generally, the area covered by the black stripes 603 is 6 in total.
There is 0% or more. Therefore, a considerable improvement in efficiency can be expected by using the microlens array.

In the actual design, the distance d between the microlens array 601 and the black stripe 603 is determined by the lens size a of the second lens group 108 and the pixel pitch b of the liquid crystal panel 114, as shown in the figure. However, the focal length f of the microlens array is also determined by the relationship shown in the figure. Although not shown in the figure, it is necessary to dispose a condenser lens on the light source side of the microlens array, and the focal length thereof is made substantially equal to the distance c between the field lens 202 and the microlens array 603.
With the addition of this condenser lens, all the chief rays of the illumination light become perpendicular to the liquid crystal panel 114, and therefore the liquid crystal panel 11
The secondary light source viewed from any part of 4 has the same shape in the same direction, and the arrangement of the microlens array can be made uniform over the entire surface.

In the present invention, various concrete designs other than the above are possible. For example, it is possible that the microlens array 601 is a lens array in which normal axially symmetric lenses are arranged, a secondary light source image is formed on the liquid crystal layer, and each light source image passes through the black stripe 603 well.
In this case, although the design becomes complicated, it is possible to further improve the efficiency. In the present invention, the image of the secondary light source is formed by the microlens array, and the structure of the integrator and the pixel and the shape of the microlens array are well adjusted so that the light source pattern of the secondary light source can efficiently pass through the opening on the pixel. The feature is that they are matched.

[0041]

As described above, according to the present invention, in the projection optical system using the integrator illumination system, the back focus of the projection lens is shortened by shortening the synthetic optical path of each light beam modulated by the liquid crystal panel. Moreover, by using the integrator illumination system for the two optical paths, it is possible to realize a projection display device that displays brighter and higher-quality images than before.

By using two liquid crystal panels for light beam modulation and simplifying the illumination optical system, a bright and high-quality projection display device can be realized compactly.

Further, by providing the integrator with a polarization conversion function, a brighter projection display device can be realized.

Furthermore, by mounting a microlens array for forming a secondary light source image of the integrator in accordance with the shape of the opening of the liquid crystal panel, the projection is brighter and thus consumes less power and does not require a cooling device. A type display device can be realized.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a projection display device of the present invention.

FIG. 2A is a diagram showing a configuration example of an integrator illumination system used in the present invention. FIG. 3B is a diagram showing a lens configuration of an integrator used in the present invention.

FIG. 3A is a diagram showing a configuration of a projection display device of the present invention. FIG. 3B is a diagram showing a pixel configuration of a liquid crystal panel used in the projection display device of the present invention.

FIG. 4A is a diagram showing a configuration of an illumination system in the projection display device of the present invention. FIG. 3B is a diagram showing the configuration and principle of a polarization separator used in the projection display device of the present invention.

FIG. 5A is a diagram showing the shape of a secondary light source formed on each lens of the integrator. FIG. 6B is a diagram showing the shape of a secondary light source when a polarization separator is used in the integrator illumination system.

FIG. 6 is a diagram illustrating an illumination principle of a microlens array used in the projection display device of the present invention.

[Explanation of symbols]

 101 light source lamp 102 reflecting mirror 104,105 first lens group 108,109 second lens group 113 condensing lens 114 liquid crystal panel 115 cube prism 201 entrance pupil 202 field lens 203 rectangular lens 402 polarization separator 405 retarder 406 prism substrate 407 Liquid crystal layer 601 Microlens array 603 Black stripe

Claims (4)

[Claims] 1. A lighting device and a light flux from the lighting device
Color light separating means for separating into primary color light, modulating means for modulating each primary color light to include image information, color light combining means for combining each modulated light, and projection optical system for projecting and displaying a combined light beam on a screen In a projection display device configured to include a plurality of secondary light sources using a plurality of lenses in the optical path from the illuminating device to the modulation means, the same number of lenses are used as the secondary light sources. A projection display device comprising a plurality of illumination optical systems arranged at positions where light sources can be provided to illuminate the modulation means. 2. An illuminating device and a light flux from the illuminating device
Color light separating means for separating into one light flux, two modulating means for modulating each color light to include image information, color light combining means for combining each modulated light, and projection optical system for projecting and displaying the combined light beam on a screen. And a plurality of secondary light sources are formed in the optical path from the illuminating device to the color light separating means by using a plurality of lenses, and the same number of lenses are provided in the projection display device. A projection type display device characterized in that an illumination optical system for irradiating the modulation means is disposed at a position where a secondary light source can be provided. 3. An illumination device, a modulator for modulating polarized light contained in a light beam from the illumination device to contain image information, and a projection optical system for projecting and displaying the modulated light beam on a screen. In the projection display device described above, a plurality of rectangular lenses are provided in the optical path from the lighting device to the modulator by a first lens group including a plurality of rectangular lenses.
A second, which forms the secondary light source and is composed of the same number of lenses
An integrator illumination optical system for irradiating the modulation means by arranging a lens group at the position of the secondary light source is arranged, and further, the illumination is provided on the side of the illuminator of the first lens group / the side of the second lens group. By disposing polarization splitting means for splitting the two polarized light beams included in the light flux from the device and orthogonal to each other at an angle of 90 degrees or less, a dual double beam corresponding to each polarized light beam is provided on the second lens group. A secondary light source image is formed, a phase difference plate is arranged at either one / both of the secondary light source positions to convert the polarization direction, and a light flux having a uniform polarization direction is emitted from the second lens group to cause the modulation device. A projection display device characterized by being illuminated. 4. A projection type display comprising an illuminating device, a modulating means for modulating a light beam from the illuminating device to contain image information, and a projection optical system for projecting and displaying the modulated light beam on a screen. In the device, in the optical path from the illuminating device to the modulating means, a plurality of rectangular lenses are provided by a plurality of rectangular lenses.
A second, which forms the secondary light source and is composed of the same number of lenses
An integrator illumination optical system for illuminating the modulation means by arranging a lens group at the position of the secondary light source is arranged, and the modulation means is a liquid crystal panel in which a switching element is formed in each pixel. A projection display device characterized in that a microlens array is arranged on the light flux incident side of the liquid crystal panel.