JP3659000B2 - Video display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection device for projecting an image on a screen using a light valve element such as a liquid crystal panel or a reflective video display device, such as a liquid crystal projector device, a reflective video display projector device, a liquid crystal television, a projection. The present invention relates to a video display device such as a type display device.
[0002]
[Prior art]
2. Description of the Related Art There is known a projection display apparatus such as a liquid crystal projector that projects light on a liquid crystal panel by applying 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 adjusts light from a light source by changing it to light and dark for each pixel with a light valve element, and projects it 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 film. The two polarizing plates are arranged so that they are different from each other by 90 °. By combining the action of rotating the polarization plane by the electro-optic effect of the liquid crystal and the selection of the polarizing component of the polarizing plate, Image information is displayed by controlling the amount of transmitted light. In recent years, in such a transmissive or reflective video display element, the element itself has been miniaturized and the performance such as resolution has been rapidly improved.
[0004]
For this reason, a display device using the image display element has been improved in size and performance, and not only simply performing image display by a video signal or the like as in the prior art, but also a projection image display device as an image output device of a personal computer. Has also been proposed. This type of projection-type image display device is particularly required to be small in size and to obtain bright images at every corner of the screen. However, the conventional projection type video display device has a problem that it is large in size and has insufficient performance such as brightness of the finally obtained image.
[0005]
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. If the liquid crystal display element is reduced in size with respect to the amount of luminous flux, the area irradiated by the illumination means is reduced, so the ratio of the luminous flux on the liquid crystal display element to the total luminous flux emitted by the light source (hereinafter referred to as light utilization efficiency) This causes problems such as lowering and darkness in the periphery of the screen. Furthermore, since the liquid crystal display element can use only polarized light in one direction, about half of the light from the light source that emits randomly polarized light is not used.
[0006]
As 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 optical system divides the light from the light source by a plurality of condensing lenses having a rectangular aperture shape constituting the first array lens, and the emitted light having each rectangular aperture shape is collected to each condensing lens having a rectangular aperture shape. Are superimposed on the irradiation surface (liquid crystal display element) by a second array lens constituted by a condenser lens group corresponding to the above. In this optical system, the intensity distribution of light irradiating the liquid crystal display element can be made substantially uniform.
[0007]
On the other hand, as an optical system for irradiating a liquid crystal display element with randomly polarized light from a light source aligned in one polarization direction, a polarization beam splitter as disclosed in Japanese Patent Laid-Open No. 4-63318 is used. In some cases, random polarized light emitted from a light source is separated into P-polarized light and S-polarized light and synthesized using a prism.
[0008]
However, in order to improve the brightness in the conventional integrator optical system, it is necessary to enlarge the array lens. When the projection type liquid crystal display device is downsized, the brightness is lowered. In addition, 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 realize downsizing of the entire apparatus and improvement in performance such as brightness. Furthermore, in the case of a projection-type liquid crystal display device, 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 illumination means, so only the illumination means is improved. However, it has been difficult to obtain a small-sized display device with good image quality performance.
[0009]
From the above, it is necessary to deal with the two aspects of improving the brightness of the liquid crystal display device and reducing the size.
[0010]
[Problems to be solved by the invention]
Summarizing the above issues in the prior art, there is a problem of how to ensure the brightness and downsizing of the video display device. To reduce the size and size of the optical unit in terms of the configuration related to the improvement of brightness. Matters related to the corresponding technologies are problems. Furthermore, in order to ensure brightness, there is a problem of improving the bonding accuracy between optical components in order to reduce the boundary surface.
[0011]
An object of the present invention is to provide a projection-type image display apparatus that can ensure brightness and can be miniaturized with high accuracy in regard to the above-described problems in the prior art.
[0012]
[Means for Solving the Problems]
In the present invention, an illumination means having a light source and having an action of irradiating the irradiated surface with light emitted from the light source, an image display element that modulates light, and light emitted from the image display element are screened. Or in a projection type image display device having projection means for projecting onto a display surface according to it,
The illuminating means is composed of at least one reflecting mirror and a plurality of condensing lenses provided in a rectangular frame having a size substantially equal to the exit aperture of the reflecting mirror, and condenses the light emitted from the light source unit. The first array lens for forming a plurality of secondary light source images and a plurality of condenser lenses are arranged in the vicinity where the plurality of secondary light source images are formed, A second array lens that forms individual lens images of one array lens, and a polarized beam that separates light from the first array lens or the second array lens into P-polarized light and S-polarized light A splitter, a λ / 2 phase difference plate for rotating any one of the polarization directions of the P-polarized light and the S-polarized light that are emitted from the polarization beam splitter, and any one of the P-polarized light and the S-polarized light To reflect polarized light And a composed polarized light combining means from the reflective portion,
The polarized light synthesizing means is arranged in a plurality so as to be adapted to any pitch in the longitudinal array direction or the lateral array direction of the lens optical axes of the first array lens or the second array lens, and An arrangement of polarization combining means equal to or thinner 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.
[0013]
With this configuration, the entire display device can be miniaturized using a small image display element, and a bright image display device with uniform image quality over the entire screen can be realized, so that the above problems can be solved easily.
[0014]
Further, the polarization combining means arranges a plurality in conformity with the pitch of either the longitudinal array direction or the lateral array direction of the lens optical axes of the first array lens or the second array lens, In addition, a gap corresponding to one row, that is, a half width of the pitch, is formed in the central portion of the first array lens or the second array lens. Or, in the case of the vertical arrangement direction, a configuration in which two of the same polarization combining means are bonded together in a vertically symmetrical inversion state.
[0015]
With this configuration, the entire display device can be reduced in size using a small image display element, and the air layer that is a boundary layer between the array lens and the polarization synthesizing unit by bonding is eliminated, making it brighter and uniform in image quality over the entire screen. A simple video display device can be realized, and further, the manufacturing cost can be reduced, the pasting accuracy can be improved, and the above problems can be easily solved.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
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.
[0018]
In FIG. 1, the projection type liquid crystal display device has a light source 1, and the light source 1 is a white lamp such as an ultra-high pressure mercury lamp, a metal halide lamp, a xenon lamp, a mercury xenon lamp, or a halogen lamp. Light emitted from the light source passes through the liquid crystal display element 2 that is a light valve element, travels toward the projection lens 3, and is projected onto the screen 4.
[0019]
The light emitted from the light bulb of the light source 1 is collected by an elliptical, parabolic or aspherical reflector 5 and 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. This incident light is separated by the polarization beam splitter 8, the transmitted light is separated into P-polarized light, and the reflected light is separated into S-polarized light. The P-polarized light is separated by a λ / 2 phase difference plate 9 disposed on the exit side surface of the polarization beam splitter 8. The polarization direction is rotated by 90 ° and becomes S-polarized light, which is incident on the condenser lens 10. The S-polarized light is repeatedly reflected, emitted from the exit surface of the adjacent polarized beam splitter 8, and enters the condenser lens 10. The condenser lens 10 has at least one structure, has a positive refractive power, has a function of further condensing the S-polarized light, and the light passing through the condenser lens 10 irradiates the liquid crystal display element 2. To do. An incident polarizing plate 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, the incident light polarizing plate 11, the liquid crystal display element 2 and the output side polarizing plate 12 are combined so that only one direction of polarized light is transmitted, so that the amount of transmitted light is halved. However, in this proposal, since the polarization beam splitter 8 is used, the polarization direction of random polarized light emitted from the light source 1 is aligned and incident on the liquid crystal display element 2. Double brightness is obtained. Further, the polarization beam splitter 8 of the present invention is thinner in the optical axis direction than the second array lens 7, shortens the optical total length, reduces the weight of the optical unit, and increases the F value of the illumination system. There is an effect to. Thereby, since the F value of the projection lens 3 can be increased by linking to the illumination system, the projection lens 3 can be made small and light.
[0020]
The light that has passed through the liquid crystal display element 2 passes through the projection means 3 such as a zoom lens and reaches the 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.
[0021]
Next, specific examples of the present invention will be described.
[0022]
FIG. 2 is a configuration diagram of an embodiment of a projection type liquid crystal display device according to the present invention. The embodiment of FIG. 2 uses a total of three transmissive liquid crystal display elements 2 as liquid crystal light valves corresponding to the three primary colors R (red), G (green), and B (blue). A three-plate projection display device is shown. In this embodiment, light emitted from a lamp 13 such as an ultra-high pressure mercury lamp, which is a light source, is reflected by the parabolic reflecting mirror reflector 5 and then substantially the same as the emission opening of the parabolic reflecting mirror reflector 5. Consists of a plurality of condensing lenses provided in a rectangular frame of the same size, condenses the light emitted from the lamp unit 14, and enters the first array lens 6 for forming a plurality of secondary light source images Furthermore, it is composed of a plurality of condensing lenses, is arranged in the vicinity of the above-described plurality of secondary light source images, and forms individual lens images of the first array lens 6 on the liquid crystal display element 2. Passes through the second array lens 7. The emitted light is incident on a row of rhomboid prisms of approximately ½ size of each lens width arranged so as to match the pitch in the horizontal direction of each lens optical axis of the second array lens 7. The prism surface is provided with a polarizing beam splitter 8. The incident light is separated into P-polarized light and S-polarized light by the polarizing beam splitter 8. The P-polarized light passes through the polarization beam splitter 8 as it is, and the polarization direction is rotated by 90 ° by the λ / 2 phase difference plate 9 provided on the exit surface of this prism, and is converted into S-polarized light and emitted. The On the other hand, the S-polarized light is reflected by the polarization beam splitter 8, reflected once again in the original optical axis direction in the adjacent rhomboid prism, and then emitted as S-polarized light. Thereafter, the light is condensed on the liquid crystal display element 2 by the condenser lens 10. On the way, the light emitted from the polarization beam splitter 8 is bent at 90 ° by the total reflection mirror 15 and is disposed at an angle of 45 ° with respect to the optical axis. B (blue) and G (green) reflection dichroic mirrors 16, R (red) light is transmitted and B and G light is reflected. The transmitted R light beam is bent by 90 ° by the R total reflection mirror 17, passes through the condenser lens 18 in front of the liquid crystal display element and the incident polarizing plate 11, and is 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.
[0023]
The liquid crystal display element 2 is provided with a number of liquid crystal display units corresponding to the pixels to be displayed (for example, three colors each having 800 horizontal pixels and 600 vertical pixels). Then, the polarization angle of each pixel of the liquid crystal display element 2 changes according to a signal driven from the outside, and finally the light having a direction that coincides with the polarization direction of the output polarizing plate 12 is emitted and becomes an orthogonal direction. Light is absorbed by the output polarizing plate 12. The amount of light passing through the polarizing plate and the amount absorbed by the polarizing plate are determined by the relationship between the polarization angle of the output polarizing plate 12 and the light having the polarized light at this halfway angle. In this way, an image according to a signal input from the outside is projected.
[0024]
The R light beam emitted from the output polarizing plate 12 is reflected by the dichroic prism 19 having the function of reflecting the R light beam, enters the projection means 3 such as a zoom lens, and is projected on the screen.
[0025]
On the other hand, the B light and G light transmitted through the B and G transmissive dichroic prism 19 are incident on the G reflecting dichroic mirror 20, and the G light is reflected by the mirror. It passes through, enters the liquid crystal display element 2, and passes through an output polarizing plate 12 provided on the light output side of the liquid crystal display element 2. The G light beam emitted from the output polarizing plate 12 is transmitted through the dichroic prism 19 having the function of transmitting the G light beam, is incident on the projection lens 3, and is projected on the screen.
[0026]
The B light beam that has passed through the G reflecting dichroic mirror 20 passes through the relay lens 21, its optical path is bent by 90 ° by the total reflecting mirror 22, passes through the relay lens 21, and then passes through the relay lens 21. It is bent and passes through the condenser lens 18 in front of the liquid crystal display element and the incident polarizing plate 11, enters the liquid crystal display element 11, and passes through the output polarizing plate 12 provided on the light emission side of the liquid crystal display element 2. The B light emitted from the output polarizing plate 12 is reflected by the dichroic prism 19 having a function of reflecting the B light, then enters the projection lens 3 and is projected on the screen.
[0027]
As described above, the light beams corresponding to R, G, and B are separated and synthesized by the color separation unit and the color synthesis unit, and the image on the liquid crystal display element 2 corresponding to each of R, G, and B is enlarged by the projection lens 3. Then, an image of each color is synthesized on the screen and an enlarged real image is obtained. In the figure, they are arranged like a power supply circuit 24 and a video signal circuit 25 and have the effect of guiding heat generated by the light source 1 to the outside by the blower fan 26. Further, in this embodiment, since the light emitted from the random light source is aligned in one direction by the polarization combining means, the incident polarizing plate generates less heat.
[0028]
In addition, the light source and the projection unit are arranged so that their optical axes are parallel to each other, and further, through a color separation / synthesis unit including the color separation unit, the liquid crystal display element, and the color synthesis unit. By arranging the power supply circuit 24 and the video signal circuit 25 as shown in the figure, the entire apparatus can be reduced in size. Further, in the present invention, the thickness of the polarization beam splitter 8 as the polarization combining means is made thinner than that of the second array lens 7 (that is, when the second array lens 7 is about 2.5 ± 0.5 mm). Therefore, the optical path length can be shortened, and the total reflection mirror 15 can be arranged close to each other, so that the set can be reduced in size.
[0029]
FIG. 3A is a diagram showing a second embodiment according to the present invention.
[0030]
The polarizing beam splitter 8 in FIG. 3A has a configuration in which a polarizing beam splitter film that separates P-polarized light and S-polarized light of light is attached to a glass plate material, which is bonded to a laminate and then sliced at 45 °. It has become. For this reason, as shown in FIG. 3A, a plate-like structure in which several vertically long rhombus prisms are arranged. This film deposition may be performed by mirror deposition of aluminum or silver every other surface. However, since this mirror portion has a role of reflecting S-polarized light, it is necessary to devise a method for preventing light from entering the prism optical path.
[0031]
In the plate-like configuration in which several polarization beam splitters 8 are arranged as described above, λ / 2 phase difference plates 9 are bonded every other row, and the separated P-polarized light is converted into S-polarized light. After the light emitted from the polarization beam splitter 8 is aligned with the S-polarized light, or after the separated S-polarized light is reflected and emitted from the prism adjacent to the incident prism as indicated by the arrow in FIG. It is also possible to align the outgoing light of the polarizing beam splitter 8 with the P-polarized light by the phase difference plate 9.
[0032]
A plurality of rhombus prisms of the flat polarizing beam splitter 8 as described above are arranged in conformity with the pitch in the lateral arrangement direction of the optical axes of the lenses of the second array lens 7, and the second array is arranged. The lens 7 is divided into left and right or upper and lower halves of the second array lens 7 with a gap, for example, a gap h having a width of ½ of the optical axis pitch, at the center of the lens 7, and symmetric with respect to the center. Then, the polarizing beam splitter 8 and another one of the same polarizing beam splitter 8 are bonded together in a state where the optical axis is inverted by 180 °.
[0033]
Conventionally, as shown in FIG. 3B, a symmetric flat plate-shaped polarizing beam splitter 8 is manufactured by a manufacturer, and the interface between the optical components of the polarizing beam splitter 8 and the second array lens 7 is an air layer. In this case, even if the antireflection film is applied to the interface, the light transmission efficiency is lowered. Therefore, the polarizing beam splitter 8 and the second array lens 7 are arranged in the horizontal arrangement direction of the lens optical axes and the polarizing beam splitter 8. It was configured to be pasted by adapting the pitch. However, in this method, the polarizing beam splitter 8 is bonded in a symmetrical manner with the center as a boundary. At this time, the same flat polarizing beam splitter 8 is bonded to each of the left and right sides. As shown in the drawing, the one side is rotated by 180 ° about the optical axis and bonded to form a symmetrical flat plate shape. The polarization beam splitter 8 is used.
[0034]
According to the present invention, a symmetric flat plate-shaped polarizing beam splitter 8 as in the prior art is manufactured by a manufacturer, and then the two polarizing beams are not subjected to a two-stage processing step for bonding to the second array lens 7. Since the splitter 8 is bonded to the second array lens 7 in a single step, the processing cost can be reduced.
[0035]
Further, since the conventional polarizing beam splitter 8 is integrated on the left and right, the bonding accuracy is stacked from the left end to the right end, and when it is bonded to the second array lens 7, it is divided into the center. Will appear on the left and right sides.
[0036]
However, according to the present invention, since the right and left polarization beam splitters 8 are bonded to the second array lens 7, the accuracy error from the center is not accumulated, and the left polarization beam splitter 8 has the left center or light quantity. Since the lens optical axis in the left half on the large second array lens 7 can be used as the center of accuracy distribution, the above-mentioned numerical value can suppress a bonding accuracy error of ± 0.125. Similarly, when the right polarization beam splitter 8 is bonded to the second array lens 7, there is also an effect that the bonding accuracy error can be halved in the same manner as the above left side. Thereby, the positional deviation of the optical axis due to the bonding error of the polarizing beam splitter 8 having a width of 1/2 of the lens optical axis pitch of the second lens array 7 is reduced, and the incident light from the second array lens 7 is converted into the polarizing beam splitter. 8 reduces the amount of vignetting. Thereby, the light transmission efficiency is improved, and the brightness performance can be improved.
[0037]
FIG. 4 is a diagram showing the appearance of the third embodiment of the present invention. In the present invention, the first array lens 6 or the second array lens 7 is provided with a first positioning portion 27 as a reference for determining the position of each lens, and the polarization beam splitter 8 is provided with a second positioning portion 28 as a positioning reference. ing. 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 notch portion, a stepped portion, or a marking. Is aligned with a positioning portion (not shown) provided on a structural member that supports and fixes the first array lens 6 or the second array lens 7, thereby positioning the first array lens 6 or the second array lens 7 absolutely. Do. Similarly, the second positioning portion 28 of the polarizing beam splitter 8 is aligned with a positioning portion (not shown) provided on a structural member that supports and fixes the polarizing beam splitter 8, thereby performing absolute positioning of the polarizing beam splitter 8. .
[0038]
According to the present invention, when the first array lens 6, the second array lens 7, and the polarization beam splitter 8 are assembled into the support structure member of the optical component, the respective reference positions can be easily aligned, and the first array lens 6 The optical axis of each of the second array lens 7 and the optical axis of the second array lens 7 coincide with each other at the design position, and the arrangement of the polarizing beam splitter 8 is also at a position where the light use efficiency is maximized in accordance with the horizontal arrangement pitch of the lens optical axis. Can be matched. As a result, the optical performance is improved, the assembly work of these optical components is simplified, and the work efficiency is improved.
[0039]
Furthermore, as shown in FIG. 4, the first positioning portion 27 of the second array lens 7 and the second positioning portion 28 of the polarization beam splitter 8 are provided at positions that match each other, and the respective positioning portions are matched when assembled. Thus, the arrangement of the polarization 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, it is possible to match the position where the light use efficiency is maximized, and the optical performance can be improved.
[0040]
FIG. 5 is a diagram 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 is provided with a first positioning portion 27 as a reference for determining the position of each lens, and the polarization beam splitter 8 is provided with a second positioning portion 28 as a positioning reference. ing. 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. Are positioned so that the array of polarization beam splitters 8 is arranged at an optimum position with respect to the optical axis of each of the first array lens 6 or the second array lens 7 so that the concave portions coincide with each other. The splitter 8 is attached to the first array lens 6 or the second array lens 7. As a result, it is possible to adjust to the position where the light utilization efficiency is maximized, and furthermore, by the bonding, the reflected light of the light at the boundary surface of the optical component can be reduced and the optical performance can be improved.
Further, the first positioning portion 27 and the second positioning portion 28 are not limited to the concave portion and the convex portion, but may be the end surfaces as shown in (b), or the convex portion as shown in (c). (D) As shown in the figure, the entire one is fitted into one positioning frame, or (e) as shown in the figure, they are positioned with respect to each other via a third member such as the positioning jig 31. May be pasted together. Furthermore, each dimension is designed in consideration of the accumulated component accuracy error so that the array of the polarization beam splitters 8 is arranged at a more optimal position with respect to each lens optical axis of the array lens, and the accuracy is further improved. A method of performing positioning is also possible.
[0041]
【The invention's effect】
As described above, in the projection display apparatus of the present invention, the thickness of the polarization beam splitter, which is the polarization combining means, is made thinner than the thickness of the second array lens (that is, the second array lens is 2.5). In the case of about ± 0.5 mm, the polarization beam splitter should be 2 mm or less), so that the optical path length can be shortened and the total reflection mirror can be placed close to each other, and the set can be miniaturized.
[0042]
In addition, the polarizing beam splitter can be aligned with the first array lens or the second array lens at a position where the light use efficiency is maximized. Further, by attaching these optical components, the light at the boundary surface of the optical components can be obtained. The reflected light can be reduced and the optical performance can be improved. A symmetric flat plate-shaped polarizing beam splitter like the conventional one is made by the manufacturer, and then the two polarizing beam splitters are processed in one step, without the two-step processing step of bonding to the second array lens. 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.
DESCRIPTION OF SYMBOLS 1 Light source 2 Image | video display element 3 Projection lens 5 Reflector 6 1st array lens 7 2nd array lens 8 Polarizing beam splitter 9 (lambda) / 2 phase difference plate 10 Condenser lens 11 Incident polarizing plate 12 Outgoing polarizing plate 27 1st positioning part 28 1st Two positioning parts

Claims (3)

A light source unit having at least one reflecting mirror;
A first array lens comprising a plurality of condensing lenses, condensing the light emitted from the light source to form a plurality of secondary light source images;
A second array lens composed of a plurality of condensing lenses and disposed in the vicinity of the plurality of secondary light source images formed;
Illuminating means having an effect of irradiating the irradiated surface with light emitted from the light source unit, an image display element for modulating the light,
A polarization beam splitter that is provided corresponding to each lens array of the second array lens and separates light into P-polarized light and S-polarized light, and P-polarized light and S-polarized light that are emitted from the polarized beam splitter. Polarization combining means comprising a λ / 2 phase difference plate for rotating any polarization direction of light, and a reflection part for reflecting any one of the P-polarized light and S-polarized light;
Projection means for projecting light emitted from the image display element,
The polarization combining means provides a first and second polarization combining corresponding to each of the equally divided second array lenses when a gap is provided in the center of the second array lens and equally divided into left and right or upper and lower halves. consists unit, and said second polarization combining unit, Ri polarization combining unit der that around the optical axis by 180 ° inverting said first polarization combining unit,
In order to position the second array lens and the polarization combining means, a first positioning portion is provided on the second array lens, and a second positioning portion is provided on the first and second polarization combining units. A video display device characterized by that. The video display device according to claim 1,
The gap provided in a central portion of said second array lens is a gap of said second one of about 1/2 the width of the pitch in the vertical arrangement direction or the transverse direction of arrangement of each of the lens optical axis of the lens array A video display device characterized by being. The video display device according to any one of claims 1 to 2,
The image display device, wherein the first and second polarization combining units are equal to or thinner than a thickness of at least one of the first array lens and the second array lens in the optical axis direction.

Images