JPH11352443A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve accuracy of assembling optical parts and to attain down- sizing and high performance of brightness of a projection type video display device. SOLUTION: The set is down-sized by shortening an optical path by making a thickness of a polarized beam splitter 8 as a polarizing synthesis means thinner than that of a 2nd array lens 7, and also arranging a total reflection mirror proximately thereto. Moreover, it is possible to reduce the light reflected on the boundary surface of the optical parts by aligning the polarizing splitter 8 at a position to maximize a light utilization factor to the 1st array lens 6 or the 2nd array lens 7, and further cementing these optical part together. The processing cost can be reduced compared with a conventional one by cementing two pieces of polarizing splitters on a 2nd array lens together in a symmetrical state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection apparatus for projecting an image on a screen using a light valve element such as a liquid crystal panel or a reflection type image display element, for example, a liquid crystal projector or a reflection type image display projector. The present invention relates to a video display device such as a device, a liquid crystal television, and a projection display device.

[0002]

2. Description of the Related Art There is known a projection type image display device such as a liquid crystal projector which enlarges and projects an image on a liquid crystal panel by irradiating light from a light source such as a light bulb to a light valve element such as a liquid crystal panel.

[0003] This type of video display device is a device in which light from a light source is changed into light and shade for each pixel by a light valve element, adjusted, and projected onto a screen or the like. For example, a twisted nematic (TN) type liquid crystal display element, which is a typical example of a liquid crystal display element, has a polarization direction before and after a liquid crystal cell formed by injecting liquid crystal between a pair of transparent substrates having a transparent electrode coating. Are arranged 90 degrees apart from each other by combining the action of rotating the plane of polarization by the electro-optic effect of the liquid crystal and the action of selecting the polarization component of the polarizing plate, thereby reducing the incident light. Image information is displayed by controlling the amount of transmitted light. In recent years, in such a transmission type or reflection type image display device, the size of the device itself has been reduced, and the performance such as resolution has been rapidly improved.

[0004] For this reason, a display device using the video display element has been miniaturized and improved in performance. In addition to a conventional video display using a video signal or the like, a projection type as an image output device of a personal computer has been developed. An image display device has also been newly proposed. In particular, this type of projection type video display device is required to be small in size and to obtain a bright image to every corner of the screen. However, the conventional projection-type image display apparatus has a problem that it is large and the performance such as the brightness of the finally obtained image is insufficient.

For example, to reduce the size of the entire liquid crystal display device,
It is effective to reduce the size of the light valve, that is, the liquid crystal display element itself. However, if the liquid crystal display element is reduced in size, the area irradiated by the liquid crystal means becomes smaller. As a result, the ratio of the amount of luminous flux on the liquid crystal display element to the total amount of luminous flux emitted by the light source (hereinafter referred to as light use efficiency) decreases, and the peripheral portion of the screen is dark. Problems arise. Further, since the liquid crystal display device can use only one-way polarized light, about half of light from a light source that emits randomly polarized light is not used.

As a means for obtaining a bright image at the periphery of the screen, for example, there is an integrator optical system using two array lenses as described in Japanese Patent Application Laid-Open No. 3-111806. The integrator optics
The light from the light source is divided by a plurality of rectangular aperture-shaped condensing lenses constituting the first array lens, and the outgoing light of each rectangular aperture shape is collected corresponding to each rectangular aperture-shaped condensing lens. The second array lens constituted by the lens group forms an image on the irradiation surface (liquid crystal display element) in a superimposed manner. In this optical system, the intensity distribution of light illuminating the liquid crystal display element can be made substantially uniform.

On the other hand, as an optical system for irradiating a liquid crystal display element with random polarized light from a light source aligned in one direction of polarization, a polarized beam as disclosed in Japanese Patent Application Laid-Open No. Hei 4-63318 is known. There is a type in which a randomly polarized light emitted from a light source is separated into a P-polarized light and an S-polarized light using a splitter and combined using a prism.

However, in the conventional integrator optical system, it is necessary to increase the size of the array lens in order to improve the brightness. When the size of the projection type liquid crystal display device is reduced, the brightness is reduced. Also, in an optical system using a polarizing beam splitter, the brightness is reduced when the size is reduced. As a result, it has been difficult to simultaneously reduce the size of the entire apparatus and improve performance such as brightness. Further, in the case of a projection type liquid crystal display device, since various factors such as the optical characteristics of the projection lens and the optical characteristics of the liquid crystal display element affect the image quality performance in addition to the above-mentioned illumination means, only the illumination means is improved. However, it was difficult to obtain a small-sized display device having good image quality performance.

As described above, it is necessary to take measures from two viewpoints of improving the brightness of the liquid crystal display device and reducing the size.

[0010]

To summarize the problems in the prior art described above, the problem is how to secure the brightness of the image display device and at the same time reduce the size of the image display device. Matters related to the technology for reducing the size in terms of configuration have been issues.
Furthermore, in order to secure the brightness, there is a problem of improving the bonding accuracy between the optical components to reduce the boundary surface.

An object of the present invention is to provide a projection type video display device which can secure high brightness and can be miniaturized with high accuracy, with respect to the above-mentioned problems in the prior art.

[0012]

According to the present invention, there is provided an illuminating means having a light source and having a function of irradiating light emitted from the light source onto a surface to be irradiated, an image display element for modulating light, Projection means for projecting light emitted from the image display element onto a screen or a display surface equivalent thereto, wherein the illumination means comprises at least one light source.
And a plurality of condensing lenses provided in a rectangular frame having substantially the same size as the exit aperture of the reflecting surface mirror. A first array lens for forming a light source image, and a plurality of condenser lenses, which are arranged in the vicinity where the plurality of secondary light source images are formed; A second array lens that forms a lens image of the first and second array lenses; a polarizing beam splitter that separates light from the first or second array lens into P-polarized light and S-polarized light; A λ / 2 retardation plate for rotating either the polarization direction of the P-polarized light or the S-polarized light, which is the light emitted from the splitter, and for reflecting any of the P-polarized light and the S-polarized light. Polarized light composed of reflective parts The polarization combining means, the plurality of polarization combining means being adapted to a pitch of any one of the lens array of the first array lens and the second array lens in the vertical or horizontal arrangement direction. Array
In addition, an arrangement of polarization combining means having a thickness equal to or smaller than the thickness of the first array lens or the second array lens in the optical axis direction is interposed between the light source and the image display element.

With this configuration, the entire display device can be reduced in size by using a small video display element,
A video display device having uniform image quality over the entire screen can be realized, and the above problem can be easily solved.

[0014] The polarization combining means may include a plurality of polarized light beams which are adapted to a pitch of the optical axis of each lens of the first array lens or the second array lens in either a vertical arrangement direction or a horizontal arrangement direction. It is arranged symmetrically if it is arranged in the center of the first array lens or the second array lens with a gap of one line, that is, a half width of the pitch, and if it is a horizontal arrangement direction with the center as a boundary. In the inverted state, or in the vertical arrangement direction, in the up-down symmetric inverted state, the same two polarization synthesizing means are bonded together.

With this configuration, the entire display device can be reduced in size by using a small-sized image display element, and the air layer which is the boundary layer between the array lens and the polarization combining means by bonding is eliminated, so that the display is brighter and covers the entire screen. A video display device with uniform image quality can be realized, and further, a reduction in manufacturing cost, an improvement in bonding accuracy, and the like are realized, and the above-described problem can be easily solved.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

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

In FIG. 1, the projection type liquid crystal display device includes:
There is a light source 1, and the light source 1 includes an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp, a mercury xenon lamp,
It is a white lamp such as a halogen lamp. Light emitted from the light source passes through a liquid crystal display element 2 which is a light valve element, is directed to a projection lens 3, and is projected on a screen 4.

Light emitted from the bulb of the light source 1 is collected by an elliptical, parabolic, or aspherical reflector 5,
The light enters the first array lens 6. After passing through the first array lens 6, the light passes through the second array lens 7 and enters the polarization beam splitter 8. The incident light is separated into P-polarized light and the reflected light into S-polarized light by the polarization beam splitter 8, and the P-polarized light is separated by the λ / 2 phase difference plate 9 disposed on the emission side surface of the polarization beam splitter 8. The polarization direction is rotated by 90 °, becomes S-polarized light, and enters the condenser lens 10. The S-polarized light repeats reflection, exits from the exit surface of the adjacent polarization beam splitter 8, and enters the condenser lens 10. The condenser lens 10 has at least one or more components, has a positive refractive power, has an action of further condensing the S-polarized light, and the light passing through the condenser lens 10 irradiates the liquid crystal display element 2. I do. An incident polarizer 11 that transmits S-polarized light is disposed on the incident side of the liquid crystal display element 2. In the conventional projection type liquid crystal display device, only the polarized light in one direction is transmitted due to the combination of the incident polarizer 11, the liquid crystal display element 2, and the exit polarizer 12, so that the transmitted light amount is reduced to about half. But,
In this proposal, since the polarization beam splitter 8 is used, the polarization direction of the randomly polarized light emitted from the light source 1 is incident on the liquid crystal display element 2 while being aligned, and ideally, it is twice that of the conventional projection type liquid crystal display device. Brightness is obtained. In addition, the polarizing beam splitter 8 of the present invention has a configuration that is thinner in the optical axis direction than the second array lens 7, shortens the entire optical length, reduces the weight of the optical unit, and increases the F value of the illumination system. Has the effect of doing Thereby, since the F value of the projection lens 3 can be increased by linking it to the illumination system, the size and weight of the projection lens 3 can be reduced.

The light passing through the liquid crystal display element 2 passes through a projection unit 3 such as a zoom lens, and reaches a screen 4. The image formed on the liquid crystal display element 2 by the projection means 3 is enlarged and projected on a screen to function as a display device.

Next, a specific embodiment of the present invention will be described.

FIG. 2 is a block diagram of one embodiment of the projection type liquid crystal display device according to the present invention. In the embodiment of FIG. 2, a total of three transmission liquid crystal display elements 2 corresponding to three primary colors of R (red), G (green), and B (blue) are used as liquid crystal light valves. 3 shows a three-panel projection display device. In the present embodiment, light emitted from a lamp 13 such as an ultra-high pressure mercury lamp, which is a light source, is reflected by a parabolic reflector 5 and then substantially coincides with the exit aperture of the parabolic reflector 5. It is composed of a plurality of condenser lenses provided in a rectangular frame of the same size, collects light emitted from the lamp unit 14 and enters the first array lens 6 for forming a plurality of secondary light source images. Further, the liquid crystal display element 2 is constituted by a plurality of condenser lenses, is arranged near the above-mentioned plurality of secondary light source images, and forms the individual lens images of the first array lens 6 on the liquid crystal display element 2. The light passes through the second array lens 7. This outgoing light is incident on a row of rhombic prisms each having a size approximately half the width of each lens arranged so as to match the lateral pitch of each lens optical axis of the second array lens 7. The prism surface is provided with a polarizing beam splitter 8, and the incident light is separated by this polarizing beam splitter 8 into P-polarized light and S-polarized light. The P-polarized light goes straight through the polarization beam splitter 8 as it is, and the polarization direction is 90 ° by the λ / 2 retardation plate 9 provided on the exit surface of the prism.
It is rotated, converted into S-polarized light, and emitted. On the other hand, the S-polarized light is reflected by the polarizing beam splitter 8, reflected again in the original optical axis direction in the adjacent rhombic prism, and emitted as S-polarized light. Thereafter, the light is condensed on the liquid crystal display element 2 by the condenser lens 10. During this process, the light emitted from the polarizing beam splitter 8 has its optical path bent by 90 ° by the total reflection mirror 15 and B (blue) and G (green) reflection dichroic mirrors arranged at an angle of 45 ° with respect to the optical axis. By 16, R (red)
Is transmitted, and B and G light are reflected. The transmitted R ray is bent at an angle of 90 ° by the R total reflection mirror 17, passes through the condenser lens 18 before the liquid crystal display element and the incident polarizer 11, and has a liquid crystal display element composed of a counter electrode, liquid crystal and the like. 2 and passes through an output polarizing plate 12 provided on the light output side of the liquid crystal display element 2.

The liquid crystal display element 2 is provided with a number of liquid crystal display portions corresponding to the pixels to be displayed (for example, 800 pixels in width and 600 pixels in three colors). Then, the polarization angle of each pixel of the liquid crystal display element 2 was changed in accordance with a signal driven from the outside, and finally light having a direction coinciding with the polarization direction of the exit polarizer 12 was emitted and became orthogonal. Light is absorbed by the output polarizer 12. The amount of light passing through the polarizing plate and the amount of light absorbed by the polarizing plate depend on the polarization angle of the output polarizing plate 12 with respect to the light having a polarization at an intermediate angle. In this way, an image is projected according to a signal input from the outside.

The dichroic prism 1 having the function of reflecting the R light emitted from the output polarizing plate 12 reflects the R light.
The light is reflected at 9 and is incident on a projection means 3 such as a zoom lens, and is projected on a screen.

On the other hand, the B and G rays transmitted through the B and G transmitting dichroic prism 19 are incident on a G reflecting dichroic mirror 20, and the G rays are reflected by the mirror, and the condenser lens 18 before the liquid crystal display element and the incident polarized light. The light passes through the plate 11, enters the liquid crystal display element 2, and passes through the output polarizing plate 12 provided on the light output side of the liquid crystal display element 2. The G light emitted from the output polarizing plate 12 passes through a dichroic prism 19 having a function of transmitting the G light, enters the projection lens 3, and is projected on a screen.

The B light beam transmitted through the G reflection dichroic mirror 20 is transmitted through the relay lens 21, its optical path is bent by 90 ° by the total reflection mirror 22, passes through the relay lens 21, and then transmitted through the relay lens 21. The optical path is bent by 90 ° and passes through the condenser lens 18 and the incident polarizer 11 in front of the liquid crystal display element.
1 and passes through an output polarizing plate 12 provided on the light output side of the liquid crystal display element 2. The B light emitted from the output polarizing plate 12 is reflected by a dichroic prism 19 having a function of reflecting the B light, then enters the projection lens 3 and is projected on a screen.

As described above, the light beams corresponding to R, G, and B are separated and combined by the color separating means and the color combining means, and the image on the liquid crystal display element 2 corresponding to each of R, G, and B is projected by the projection lens 3. Is enlarged, and images of each color are synthesized on a screen to obtain an enlarged real image. In the same drawing, the power supply circuit 24 and the video signal circuit 25 are arranged, and the blowout fan 26 has an action of guiding heat generated by the light source 1 to the outside. Further, in this embodiment, since the emitted light from the random light source is aligned in one direction by the polarization synthesizing means, the generation of heat of the incident polarizing plate is small.

Further, the light source and the projection means are arranged so that their optical axes are parallel to each other, and a color separation / combination unit comprising the color separation means, the liquid crystal display element and the color combination means. By arranging the power supply circuit 24 and the video signal circuit 25 as shown in the figure, the size of the entire device can be reduced. Further, in the present invention, the thickness of the polarization beam splitter 8 as the polarization combining means is made thinner than the second array lens 7.
(That is, when the second array lens 7 is about 2.5 ± 0.5 mm, the polarizing beam splitter 8 is set to 2 mm or less), whereby the optical path length can be shortened, and the total reflection mirror 15 is arranged close to The size of the set can be reduced.

FIG. 3A is a diagram showing a second embodiment according to the present invention.

The polarizing beam splitter 8 shown in FIG. 3A is provided with a polarizing beam splitter film for separating the P-polarized light and the S-polarized light of a glass plate material. The configuration is as follows. For this reason, as shown in FIG. 3A, it has a plate-like configuration in which several vertically elongated rhombic prisms are arranged. In this film formation, mirror deposition of aluminum or silver may be performed on every other surface.
However, since this mirror part plays the role of reflecting S-polarized light, it is necessary to take measures to prevent light from entering this prism optical path.

In the plate-like configuration in which several polarization beam splitters 8 are arranged as described above, λ /
Two phase difference plates 9 are bonded together, and the separated P-polarized light is
The light is converted into polarized light, and the light emitted from the polarizing beam splitter 8 is aligned with the S-polarized light, or the separated S-polarized light is reflected and emitted from a prism adjacent to the incident prism as shown by the arrow in the figure. Thereafter, the light emitted from the polarization beam splitter 8 can be aligned with the P-polarized light by the λ / 2 retardation plate 9.

A plurality of rhombic prisms of the above-mentioned plate-shaped polarizing beam splitter 8 are arranged so as to be adapted to the pitch in the horizontal arrangement direction of the optical axis of each lens of the second array lens 7, and A gap is provided at the center of the second array lens 7, for example, a gap h having a half width of the optical axis pitch.
The second array lens 7 is divided into left and right or upper and lower halves, and the polarizing beam splitter 8 and another of the same polarizing beam splitter 8 are centered on the optical axis in a symmetrical state with respect to the center. Laminate 180 ° inverted.

Conventionally, as shown in FIG. 3 (b), a symmetrical flat polarizing beam splitter 8 is prepared by a manufacturer, and the interface between the polarizing beam splitter 8 and the optical components of the second array lens 7 is determined. In the case of an air layer, even if an antireflection film is applied to the interface, the light transmission efficiency is reduced. Therefore, the polarization beam splitter 8 and the second array lens 7 are
The optical axis of each lens and the pitch of the polarizing beam splitter 8 in the horizontal arrangement direction are adapted to be bonded. However, in this method, the polarizing beam splitter 8 is bonded in a symmetrical manner with respect to the center. At this time, the same plate-shaped polarization beam splitter 8 is attached to each of the left and right sides, but as shown in the figure, one side is rotated by 180 ° about the optical axis and attached to the center, and the left-right symmetrical plate-shaped is attached. The polarizing beam splitter 8 is used.

According to the present invention, a symmetrical plate-shaped polarizing beam splitter 8 as in the related art is prepared by a manufacturer, and then is bonded to the second array lens 7 without performing a two-stage processing step. Since the polarizing beam splitter 8 is bonded to the second array lens 7 in a one-step processing step, the processing cost can be reduced.

The conventional polarization beam splitter 8
Since the right and left are integrated, the bonding accuracy is stacked from the left end to the right end, and when bonding to the second array lens 7,
It becomes the center distribution, and an inevitable bonding accuracy error on the left and right, for example, ± 0.25 appears on both the left and right sides.

However, according to the present invention, since the left and right separate polarization beam splitters 8 are bonded to the second array lens 7, accuracy errors from the center are not accumulated, and the left polarization beam splitter 8 is not Since the center or the optical axis of the lens in the left half on the second array lens 7 having a large light amount can be set as the center of the accuracy distribution,
With the above numerical values, the bonding accuracy error of ± 0.125 can be suppressed. Similarly, the polarization beam splitter 8 on the right side
Is also bonded to the second array lens 7, there is an effect that the bonding accuracy error can be reduced to half as in the case of the left side. As a result, 1/1 of the lens optical axis pitch of the second lens array 7
The displacement of the optical axis due to the bonding error of the two-width polarization beam splitter 8 is reduced, and the amount of incident light from the second array lens 7 that is vignetted by the polarization beam splitter 8 is reduced. As a result, the light transmission efficiency is improved, and the performance of brightness can be improved.

FIG. 4 is a view showing the appearance of a third embodiment of the present invention. In the present invention, the first array lens 6 or the second array lens 7 has a first positioning portion 27 as a reference for determining the position of each lens, and the polarizing beam splitter 8 has a second positioning portion 28 as a positioning reference.
Is provided. The first positioning portion 27 and the second positioning portion 28 are formed by engraving (shown in FIG. 4), a concave portion, a convex portion, an end face, a cutout portion, a step portion, a marking, or the like. Is aligned with a positioning portion (not shown) provided on a structural member for supporting and fixing the first array lens 6 or the second array lens 7, thereby obtaining the first array lens 6 or the second array lens 7.
Absolute positioning. Similarly, the second positioning portion 28 of the polarizing beam splitter 8 is connected to the polarizing beam splitter 8.
Absolute positioning of the polarizing beam splitter 8 is performed by matching with a positioning portion (not shown) provided on a structural member for supporting and fixing the polarizing beam splitter 8.

According to the present invention, the first array lens 6,
When the second array lens 7 and the polarizing beam splitter 8 are incorporated into the support structure of the optical component, the reference alignment of each of them becomes easy, and the first array lens 6 and the second array lens 7 face each other. The optical axis of the lens coincides with the designed position, and the arrangement of the polarization beam splitter 8 can be adjusted to the position where the light use efficiency is maximized in accordance with the horizontal arrangement pitch of the optical axis of the lens. This improves the optical performance and simplifies the work of assembling these optical components, thereby improving work efficiency.

Further, as shown in FIG. 4, a first positioning portion 27 of the second array lens 7 and a second positioning portion 28 of the polarization beam splitter 8 are provided at positions matching each other, and the respective positioning portions are assembled when assembled. By matching, the arrangement of the polarizing beam splitters 8 is arranged at an optimum position with respect to each lens optical axis of the second array lens 7. As a result, the position can be adjusted to the position where the light use efficiency is maximized, and the optical performance can be improved.

FIG. 5 is a view showing the appearance of a fourth embodiment of the present invention. In the present invention, the first array lens 6 or the second array lens 7 has a first positioning portion 27 as a reference for determining the position of each lens, and the polarizing beam splitter 8 has a second positioning portion 28 as a positioning reference.
Is provided. The first positioning portion 27 and the second positioning portion 28 are formed of a concave portion and a convex portion as shown in FIG. 5A, and the first positioning portion 27 and the second positioning portion 28 are combined to form a convex portion. So that the recess matches
The polarizing beam splitter 8 is positioned so that the arrangement of the polarizing beam splitters 8 is arranged at an optimum position with respect to the lens optical axis of each of the first array lens 6 or the second array lens 7, and the polarizing beam splitter 8 is moved to the first array lens 6 or Affix to the second array lens 7. Accordingly, the position can be adjusted to the position where the light use efficiency is maximized. Further, by bonding, the reflected light of the light on the boundary surface of the optical component can be reduced, and the optical performance can be improved. In addition, the first positioning portion 27
Further, the second positioning portion 28 is not limited to the concave portion and the convex portion, but may be formed between end faces as shown in FIG. 2B, or may be formed between convex portions as shown in FIG. As shown in the drawing, the whole of one may be fitted into one of the positioning frames, or the positioning frames may be bonded to each other via a third member such as a positioning jig 31 as shown in FIG. Furthermore, each dimension is designed in consideration of the accumulated error of the component accuracy so that the arrangement of the polarizing beam splitters 8 is arranged at an optimum position with respect to the optical axis of each lens of the array lens. A method of performing positioning is also possible.

[0041]

As described above, in the projection type image display apparatus of the present invention, the thickness of the polarization beam splitter, which is the polarization combining means, is smaller than the thickness of the second array lens (ie, the second array lens). (When the lens is about 2.5 ± 0.5mm, the polarizing beam splitter should be 2mm or less.) This makes it possible to shorten the optical path length and to arrange the total reflection mirror close to each other, making it possible to reduce the size of the set. Becomes

Further, the polarizing beam splitter can be adjusted to the position where the light use efficiency is maximized on the first array lens or the second array lens. Further, by bonding these optical components, the boundary between the optical components can be adjusted. There is an effect that the reflected light of the light on the surface can be reduced and the optical performance can be improved. A two-stage processing step of attaching a second symmetrical polarizing beam splitter to a second array lens after manufacturing a left-right symmetrical plate-shaped polarizing beam splitter by a manufacturer is performed in one step. Since it is bonded to the second array lens in the process, the processing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a projection type liquid crystal display device showing a first embodiment of the present invention.

FIG. 3 is a diagram showing a second embodiment of the present invention.

FIG. 4 is a diagram showing a third embodiment of the present invention.

FIG. 5 is a diagram showing a fourth embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light source 2 Image display element 3 Projection lens 5 Reflector 6 First array lens 7 Second array lens 8 Polarization beam splitter 9 λ / 2 phase difference plate 10 Condenser lens 11 Incident polarizer 12 Outgoing polarizer 27 First positioning part 28 First Two positioning parts

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Taro Hase, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Multimedia System Development Headquarters, Hitachi, Ltd. (72) Inventor Tomohiro Miyoshi Yoshida, Totsuka-ku, Yokohama-shi, Kanagawa (292) Inventor Yasuo Otsuka 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. Hitachi, Ltd. Multimedia System Development Headquarters (72) Inventor Maruyama Takesuke 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi, Ltd. Multimedia System Development Headquarters

Claims (9)

[Claims] 1. An image display device having a light source unit for emitting light, wherein the light emitted from the light source is a light valve means for forming an optical image corresponding to an image signal, for example, a liquid crystal display device for modulating light. Alternatively, in a video display device including a reflective display element and the like, an illumination optical system having an action of irradiating the video display element, and projection means for projecting light emitted from the video display element, The illuminating means includes a light source unit having at least one reflecting surface mirror having a rectangular, circular, or polygonal exit aperture, and a plurality of condenser lenses provided within a size substantially equal to the exit aperture. A first array lens for condensing the light emitted from the unit to form a plurality of secondary light source images, and a plurality of condensing lenses, and a near array where the plurality of secondary light source images are formed A second array lens that is arranged beside and forms an image of each lens of the first array lens on the image display element, and light from the light source or the first array lens or the second array lens. A polarizing beam splitter for separating into P-polarized light and S-polarized light, and a λ / 2 phase difference plate for rotating any one of the P-polarized light and the S-polarized light, which is the output light of the polarized beam splitter. A polarization combining unit configured to reflect any one of the P-polarized light and the S-polarized light, and the polarization combining unit includes a first array lens and / or Arranging a plurality of polarization combining means by adjusting the optical axis of the polarizing beam splitter to a pitch in either the vertical arrangement direction or the horizontal arrangement direction of each lens optical axis of the second array lens; and Ray lens and, or a sequence of a second optical axial thickness of the lens array is equal to or thinner polarization combining means, the image display device being characterized in that interposed between the light source and the image display device. 2. An illuminating device having a function of irradiating light emitted from a light source onto a surface to be irradiated, an image display device for modulating light, and a projecting device for projecting light emitted from the image display device. In the image display device, the illumination unit includes a light source unit having at least one reflecting surface mirror and a plurality of condenser lenses, and collects light emitted from the light source to form a plurality of secondary light source images. A first lens array, comprising a plurality of condenser lenses, and a second lens array disposed in the vicinity where the plurality of secondary light source images are formed;
A polarizing beam splitter for separating light provided corresponding to each lens row of the second lens array into p-polarized light and s-polarized light, and p-polarized light and s-polarized light emitted from the polarized beam splitter A λ / 2 retardation plate for rotating any one of the polarization directions of the light, and a polarization synthesizing means composed of a reflector for reflecting any of the P-polarized light and the S-polarized light. The polarization combining means adjusts the optical axis of the polarizing beam splitter to a pitch in either the vertical or horizontal arrangement direction of the optical axis of each of the first array lens or the second array lens. A plurality of polarization combining means are arranged, and the first lens array or the second lens array is arranged in a central part of the first lens array or the second lens array with a gap of a half width of the pitch. The Len The left and right or upper and lower halves of the array or the second lens array are divided into two halves. An image display apparatus, wherein another part of the same polarization combining means is bonded to the means in a state of being inverted by 180 ° about the optical axis. 3. The image display device according to claim 1, wherein the polarization combining means is arranged in a vertical or horizontal arrangement direction of a lens optical axis of each of the first array lens or the second array lens. A plurality of arrays are arranged in conformity with any of the pitches, and a line is provided in a central portion of the first array lens or the second array lens, that is, a gap having a half width of the pitch is provided. The first array lens or the second array lens is divided into left and right or upper and lower halves, and is symmetrical in the horizontal arrangement direction with respect to the central portion, or in the vertical arrangement direction in the vertical arrangement direction. An image display device, wherein the polarization combining means and another piece of the same polarization combining means are bonded in a state of being inverted by 180 ° about the optical axis. 4. The image display device according to claim 1, wherein the amount of luminous flux passing through each of the first array lens and the second array lens is maximized. An image display device, wherein an optical axis of a lens is set as a lens reference position, and a positioning reference of the polarization combining means is adjusted to the lens reference position. 5. The image display device according to claim 4, wherein: a positioning section as a reference for determining a position of each lens of the first array lens or the second array lens; An image display device comprising a positioning section as a positioning reference for a polarization combining means. 6. The image display device according to claim 5, wherein a first positioning portion indicating a reference position of each lens of the first array lens or the second array lens. A configuration in which a second positioning portion for adjusting the optical axis center of one array of the polarization combining means to the reference position is combined at the time of assembly, for example, the first positioning portion and the second positioning portion are convex. A video display device comprising a part and a concave part, which is positioned during assembly. 7. The image display device according to claim 5, wherein a reference position in each of the first array lens and the second array lens is set as one reference of the polarization combining means. The optical axis pitch of each lens is adjusted to the center of the optical axis of the array, and the stacking error of the pitch of the center of the optical axis of each array from the center of the optical axis of one reference array of the polarization combining means is determined. An image display device provided at a position suitable for a dimension value including the image value. 8. A display device comprising: a multi-segment array lens; and polarization combining means having a thickness equal to or smaller than at least one of the array lenses. 9. An array lens having a multi-segment shape and polarization combining means, wherein said array lens and said polarization combining means have predetermined relative positions so as to match the optical axis of each lens of said array lens. A display device characterized by being integrally bonded with a relationship.