JP2980441B2 - Projection type liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type liquid crystal display device. More specifically, the present invention provides
Three liquid crystal panels for displaying images of red, green, and blue respectively, and an optical system that separates white light from a light source into red, green, and blue light and enters the corresponding liquid crystal panels,
A cross-shaped dichroic mirror that receives, combines and outputs image light from the liquid crystal panels of red, green, and blue, and a projection lens that projects a combined image from the dichroic mirror toward a screen. In particular, in a projection type liquid crystal display device having a cross-shaped dichroic mirror,
Not to apply stress such as bending and bending.
Further , the present invention relates to positioning and fixing the mirror and the liquid crystal panel relatively to form one block.

[0002]

2. Description of the Related Art Cross-shaped dichroic mirrors are used to display liquid crystal panel images for red display, green display and blue display.
And combine the images using a single projection lens.
A conventional projection type liquid crystal display device that projects on a
No. 2,169,594, JP-A-63-37316, and the like.

In these projection type liquid crystal display devices, as described above, a cross-shaped dichroic mirror is used instead of a prism as an optical component for synthesizing three primary color image lights. It is possible to reduce the weight and cost of an optical system for image synthesis.

[0004]

However, in the conventional projection type liquid crystal display device, the cross-shaped dichroic mirror and each liquid crystal panel for making the image light incident on the dichroic mirror from a predetermined direction are relatively opposed to each other. No consideration has been given to the positioning and fixing into one block. In addition, three LCD panels
Dichroics that are important for accurate overlay of images
Is care taken to maintain mirror flatness?
Was.

[0005] The flatness of the dichroic mirror is maintained.
Dichroic mirror with flatness and 3
Combining two liquid crystal panels, positioning them with high precision , and forming them as one block in advance, such as adjusting the convergence of the three-color image of red, green, and blue when this is set in the projection type liquid crystal display device, The troublesome work of adjusting the relative positions of the liquid crystal panels is completely unnecessary.

SUMMARY OF THE INVENTION It is an object of the present invention to provide different transmission and reflection characteristics.
Place each dichroic mirror on the dichroic mirror
1 block, 2nd block with dichroic mirror
To ensure that both have a dichroic mirror is substantially in a cross shape
After that, each liquid crystal panel for allowing image light to enter the dichroic mirror from a predetermined direction is relatively positioned and fixed to form one block, so that the liquid crystal panel can be mounted after assembly. Another object of the present invention is to provide a projection type liquid crystal display device which does not require complicated operations such as convergence adjustment of a cross-shaped dichroic mirror and adjustment of a relative position of a liquid crystal panel.

[0007]

In order to achieve the above object, according to the present invention, three liquid crystal panels for displaying images of red, green, and blue colors, and white light from a light source for red, green, ,
An optical system that separates the blue light into the corresponding liquid crystal panels, and a cross dichroic mirror that receives, combines, and outputs image light from the red, green, and blue liquid crystal panels; And a projection lens for projecting the composite image from the dichroic mirror toward the screen, the projection type liquid crystal display device having different transmission and reflection characteristics.
Dichroic mirrors
First block, dichroic mirror arrangement Second block
So that both dichroic mirrors are almost cross-shaped
After mounting, each liquid crystal panel for allowing image light to enter the dichroic mirror from a predetermined direction was relatively positioned and fixed to form a cross-shaped dichroic mirror structure as one block.

Further, before forming a cross-shaped dichroic mirror structure as one block, an adjustment fixing means for adjusting the relative position of the liquid crystal panel with respect to the cross-shaped dichroic mirror and then fixing the liquid crystal panel is provided.

[0009]

The cross dichroic mirror structure, which is one block, is set on a convergence adjusting jig consisting of a light source, a projection lens, a screen, etc. before being incorporated into a projection type liquid crystal display device. By projecting a test pattern for the presence adjustment, the position of each liquid crystal panel is finely adjusted, and the convergence and focus of the three color images of red, green and blue are adjusted. After finely adjusting the position of each liquid crystal panel by the adjusting and fixing means, it is fixed so as not to move. Here, two types
Dichroic mirrors are two types of dichroic
It is attached to the Ick mirror mounting block,
The flatness of each dichroic mirror is impaired
There is no. Therefore, by fine-tuning the position of each LCD panel,
Adjustment of verses is possible.

By incorporating the cross-shaped dichroic mirror structure adjusted by the adjusting jig into the projection type liquid crystal display device, a projection type liquid crystal display device capable of projecting images with convergence can be easily obtained. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a cross-shaped dichroic mirror structure as a main part of an embodiment of the present invention, and a projection lens for projecting composite image light output from the structure onto a screen.

In FIG. 1, 1 is a cross-shaped dichroic mirror structure, 2 is a projection lens, 3 is a dichroic mirror support frame, 4, 5, and 6 are liquid crystal panels, 7 is red light, and 8 is green light. , 9 is blue light, 10 is opening, 80
Reference numerals -1 and 80-2 denote dichroic mirrors, which cross each other to form a cross, thereby forming a cross dichroic mirror.

Referring to FIG. The configuration of the cross-shaped dichroic mirror structure 1 is such that a red dichroic mirror, a green light transmissive dichroic mirror 80-1, a blue light reflective dichroic mirror, and a green light transmissive dichroic mirror are provided inside a rigid dichroic mirror supporting frame 3. 80-2 are arranged in a cross shape .
The support frame 3 is basically a rigid body as shown in FIG.
It consists of two blocks 55 and 56 consisting of
In this configuration, the flatness of the mirror fixing surfaces 57 and 58 is adjusted.
Degree and the plane accuracy of the mirror fixing surfaces 59 and 60 are sufficient
Accuracy is easy and therefore each dichroic
The mirror can be arranged and fixed without distortion. Further, on the outer surface of the support frame 3, liquid crystal panels 4, 5, 6 for displaying a red image, for displaying a green image, and for displaying a blue image are arranged.

Each liquid crystal panel 4 of the structure 1
When red light 7, green light 8, and blue light 9 are incident on 5, 6, these lights 7, 8, 9 are modulated by liquid crystal panels 4, 5, 6 to become image light. The image light is applied to a cross-shaped dichroic mirror 80-1, mounted in the support frame 3.
The light is converted into a combined image light (not shown) by 80-2, and is emitted from the opening 10. The combined image light emitted from the opening 10 enters the projection lens 2 and is enlarged and projected on a screen (not shown).

FIG. 2 is a schematic sectional view of the vicinity of a cross-shaped dichroic mirror structure 1 in a projection type liquid crystal display device according to an embodiment of the present invention. In the figure, 11 is a light source, 12 is a cold mirror (a mirror that transmits or absorbs long-wavelength light and does not reflect, that is, a heat ray cut filter), 13 is an ultraviolet cut filter, 14, 15, and 17
Is a dichroic mirror, 16 and 18 are total reflection mirrors,
80 is a cross-shaped dichroic mirror.

Referring to FIG. 2, a light source light path of a projection type liquid crystal display device using a cross dichroic mirror for synthesizing a three-color image and a principle of synthesizing the three-color image will be briefly described. The light emitted from one light source 11 is a cold mirror.
The light is reflected at 12 and passes through the ultraviolet cut filter 13 so that almost only visible light enters the blue, green light reflection and red light transmission dichroic mirrors 14.

Of the visible light incident on the dichroic mirror 14, blue and green lights are reflected, and are incident on a green light reflecting dichroic mirror 15. The red light transmitted through the dichroic mirror 14 is reflected by the total reflection mirror 16 and then enters the red image display liquid crystal panel 4.

Of the light incident on the green light reflecting dichroic mirror 15, the green light is the dichroic mirror 15
After the light is reflected by the liquid crystal panel 5 for green image display, the light transmitted through the dichroic mirror 15 passes through the dichroic mirror 17 for blue light and the mirror 18 for total reflection, and then passes through the liquid crystal panel 5 for blue image display. 6 is incident.

Light incident on each of the liquid crystal panels 4, 5, and 6 is applied to a cross-shaped dichroic mirror 8 provided in the cross-shaped dichroic mirror structure 1 and maintaining flatness.
In this configuration, the light is combined at 0 and is incident on the projection lens 2.
Needless to say, the cross-shaped dichroic mirror 80 is a three-color photosynthetic mirror in which a red light-reflecting and green light transmitting dichroic mirror and a blue light reflecting / green light transmitting dichroic mirror are combined in a cross shape.

In this configuration, the light source is one light source 11, but two or more light sources may be used, and the arrangement of the dichroic mirror and the total reflection mirror may be another arrangement. Of course.

FIG. 3 is a partial sectional view showing an attached state of the cross-shaped dichroic mirror structure 1 in the projection type liquid crystal display device. In the figure, reference numerals 4 and 6 denote liquid crystal panels, and reference numerals 19-1 and 19-2 denote cross-shaped dichroic mirrors.
The side plates of the structure 1 , 20-1 and 20-2 are auxiliary side plates, 21
-1, 21-2 are side plates of the projection type liquid crystal display device , 22-
1, 22-2, 22-3, and 22-4 are mounting portions.

Referring to FIG. The side plates 19-1 and 19-2 of the cross-shaped dichroic mirror structure 1 are fixed to the side plates 21-1 and 21-2 of the projection type liquid crystal display device. By such fixing, the opening through which light enters and exits the cross-shaped dichroic mirror structure 1 is not blocked.

The cross-shaped dichroic mirror structure 1 is
As a specific example of fixing in the projection type liquid crystal display device, first, in FIG. 3, the side plates 19-1 and 19-2 and the auxiliary side plate 2
The auxiliary side plates 20-1 and 20-2 are fixed to the side plates 21-1 and 21-2 of the projection type liquid crystal display device in such a state that the positions 0-1 and 20-2 can be slightly changed from each other. .

After the fixing, the side plates 19-1 and 19-2 and the auxiliary side plates 20-1 and 20-2 are screwed or fixed with an adhesive (not shown). , So that the mutual positions of the auxiliary side plates 20-1 and 20-2 do not change. According to this method, for example, the side plates 21-1, 21
-2, the cross-shaped dichroic mirror structure 1 mounting portions 22-1, 22-2 and 22-3, 22-4 have side plates even if their mutual positions are slightly deviated from the design center due to a part processing error or the like. 19-1, 19-2 and auxiliary side plate 20-
Since the mutual positions of 1, 20-2 can be changed and the above error can be absorbed, the dichroic mirror can be mounted in the apparatus without applying a strain stress to the cross-shaped dichroic mirror.

By arranging the cross-shaped dichroic mirror in the apparatus without distortion and appropriately adjusting the positions of the liquid crystal panels 4, 5, and 6, the projected images on the liquid crystal panels 4, 5, and 6 are completely completed. (With convergence).

The arrangement of the liquid crystal panel for obtaining a projection image with a proper convergence is based on a red light reflecting and green light transmitting dichroic mirror constituting a cross-shaped dichroic mirror.
On the other hand, the display section of the green image display liquid crystal panel 5 and the display section of the red image display liquid crystal panel 4 are symmetrically arranged, and the blue light reflection and the green light transmission dichroic mirror are blue. The display section of the image display liquid crystal panel 6 and the display section of the green image display liquid crystal panel 5 are arranged symmetrically.

FIG. 14 shows a three-color image 2 of red, green and blue.
A cross-shaped dichroic mirror capable of adjusting the convergence of 3, 24, 25;
25 shows a schematic diagram of an arrangement of 25. In FIG.
Is a dichroic mirror with flatness, 28, 2
Reference numerals 9 and 30 denote light, 31 is a three-color combined light, 32 is an enlarged projected image, and 2 'is a projection lens.

Referring to FIG. Maintaining flatness is red <br/> color light reflection, red display image 23 to a green light transmitting dichroic mirror -26, green display image 24 is symmetrical, also flat
When the blue display image 25 and the green display image 24 are symmetrically arranged with respect to the blue light reflection and green light transmission dichroic mirror 27 that maintains the flatness, the display images 23 and 2 are displayed.
The lights 28, 29, and 30 emitted from the light sources 4, 25 become three-color combined light 31 before entering the projection lens 2 ', are projected by the projection lens 2', and are enlarged projection images in which three-color convergence is matched. 32 is obtained. Note that the projected image converter
A specific example of the liquid crystal panel position adjusting mechanism for adjusting the sense will be described later with reference to FIGS.

FIG. 4 is an explanatory view of a specific method of assembling the cross-shaped dichroic mirror structure 1 used in the present invention. In the figure, 2 is a projection lens,
3 is a support frame, 4, 5, and 6 are liquid crystal panels, and 19-1 and 1
9-2 is a side plate, 33, 34, 35 are liquid crystal panel support adjustment fixing plates, 36, 37, 37 'are dichroic mirrors,
38-1, 38-2, 39-1 and 39-2 are mirror support fixing parts.

Referring to FIG. Basic as shown in FIG.
The liquid crystal panels 4, 5 and 6 are fixed to the dichroic mirror support frame 3 composed of two blocks 55 and 56 via liquid crystal panel support adjustment fixing plates 33, 34 and 35. Each of the liquid crystal panels 4, 5, 5 is adjusted by adjusting fixing screws or the like (not shown) attached to the adjusting and fixing plates 33, 34, 35.
The position of No. 6 can be changed by a very small amount, such as forward, backward, left, right, up and down.

The red light reflecting and green light transmitting dichroic mirrors 36 are connected to the dichroic mirror ends 36-1 and 36-3.
By 6-2, it is fixed to the mirror support fixing portions 38-1 and 38-2 formed on the side plates 19-1 and 19-2. Also,
The dichroic mirrors 37 and 37 ′, which are divided into two, blue light reflection and green light transmission, are dichroic mirror ends 3.
It is fixed to the mirror support fixing parts 39-1 and 39-2 by 7-1 and 37-2 and 37'-1 and 37'-2.

Dichroic mirror with flatness maintained
The cross-shaped dichroic mirror structure 1 to which the liquid crystal panels 4, 5, 6 and the like are attached is a simple projection set adjustment jig before installing it in a projection type liquid crystal display device. The adjustment is performed so that the convergence of the projected images is adjusted by setting them on a tool (not shown), and the focuses of the projected images of red, green, and blue are aligned.

That is, the positions of the cross-shaped dichroic mirrors 36, 37, 37 'and the liquid crystal panels 4, 5, 6 are adjusted so that the convergence of the projected images is matched, and the red, red, The focuses of the green and blue projected images are aligned. By disposing the structural body 1 whose position adjustment has been completed in the projection apparatus, a color projection image with convergence and focus is basically obtained only by adjusting the projection lens 2. Can be done.

FIG. 5 is a front view showing a liquid crystal panel frame assembly in the cross-shaped dichroic mirror structure 1. In the figure, reference numeral 35 denotes a liquid crystal panel support adjusting and fixing plate, and reference numeral 6 denotes a liquid crystal panel. The front of the liquid crystal panel frame assembly in which the liquid crystal panel 6 is mounted on the liquid crystal panel supporting and adjusting fixing plate 35 is shown. The liquid crystal panel 6 has non-display portions 6-1 and 6-2 around it.
The liquid crystal panel holding plates 40 and 41 formed on the liquid crystal panel support adjustment fixing plate 35 and the fixing screws 42-1 and 42-
2, 42-3, and 42-4, the support adjustment fixing plate 35
Attached to.

FIG. 6 is a sectional view taken along line XX in FIG. FIG. 6A shows a screw hole 48 so that the relative position between the support adjustment fixing plate 35 and the liquid crystal panel 6 can be changed.
The bolts and nuts at -1 and 48-2 are in a loosened state, whereas FIG.
The bolts and nuts in the screw holes 48-1 and 48-2 are tightened so that the relative positions of the liquid crystal panel 5 and the liquid crystal panel 6 are fixed. Normal adjustment is performed in the state shown in FIG. 6A, and the state is changed to the state shown in FIG.

FIG. 7 is a sectional view taken along line YY in FIG. Please refer to FIG. 5, FIG. 6 and FIG. Liquid crystal panel holding plates 40 and 41 and non-display portions 6-1 around the liquid crystal panel,
A spring-like object 45 is arranged between the liquid crystal panel 6 and the liquid crystal panel 6.

The liquid crystal panel support adjusting and fixing plate 35 is provided with liquid crystal panel pressing plates 40 and 41, and also includes screws 43-1, 43-2 and 43- for moving the liquid crystal panel in the horizontal direction.
3, 43-4, 43-5, 43-6, 43-7, 43-
8. Screw holes 44-1 and 44- with spring properties in the radial direction
2 etc. are formed. The screw holes 44-1 and 44-2 basically have a structure in which elastic bodies 46-1 and 46-2 such as springs and rubbers are arranged in holes having a diameter of about 1.2 to 4 times the screw diameter. .

The screw holes having spring properties in the radial direction may be formed in the screw holes 48-1 and 48-2 of the liquid crystal panel. Hole 4
Needless to say, it may be formed on both of 8-1 and 48-2. When the liquid crystal panels 4, 5, and 6 are mounted on the cross-shaped dichroic mirror support frame 3 by applying the liquid crystal panel frame assembly configured as described above, the mutual positions of the panels 4, 5, and 6 are slightly different. Change is possible,
Liquid crystal panel integrated cross dichroic mirror structure 1
Is realized.

FIG. 8 is a front view showing another example of the liquid crystal panel frame assembly in the cross-shaped dichroic mirror structure 1. FIG. 9 is a sectional view taken along line XX in FIG. FIG. 9A shows the support adjustment fixing plate 3.
The bolts and nuts in the screw holes 48-1 and 48-2 are loosened so that the relative position between the liquid crystal panel 5 and the liquid crystal panel 6 can be changed. On the other hand, FIG. The bolts and nuts in the screw holes 48-1 and 48-2 are tightened so that the relative position between the plate 35 and the liquid crystal panel 6 is fixed. That is, (a) of FIG.
It is a figure corresponding to (b).

FIGS. 8 and 9 are different from FIGS. 5 and 6 in that a spring-like object 47-
1, 47-2, 47-3, 47-4, 47-5, 47-
6, 47-7, and 47-8. 8 and 9, the spring objects 47-1, 47-2, 47
-3, 47-4, 47-5, 47-6, 47-7, 47
−8 with the liquid crystal panel moving screws 43-1, 43-2, 4
3-3, 43-4, 43-5, 43-6, 43-7, 4
Although the case where they are arranged at the same position as the position of 3-8 is shown, these positions do not necessarily have to be the same.

The spring objects 47-1, 47-2, 47-
3, 47-4, 47-5, 47-6, 47-7, 47-
8, the liquid crystal panel support adjustment fixing plate 35 is provided.
Even if the screw holes 44-1 and 44-2 are not provided with a spring property, the smooth position adjustment and fixing of the both 6 and 35 may be sufficient.

FIG. 10 shows a liquid crystal panel support adjustment fixing plate 35.
FIG. 5 is an enlarged cross-sectional view of a portion where a peripheral non-display portion 6-1 of the liquid crystal panel 6 is pressed by a liquid crystal panel pressing plate 40 and a spring material. In other words, FIG. 10 is a diagram similar to FIG. FIG. 10A shows the case where the coil spring 45-1 is used, and FIG. 10B shows the case where the plate spring 45-2 is used.

FIG. 11 shows a liquid crystal panel support adjustment fixing plate 35.
Is composed of an upper support adjusting and fixing plate 35-1 and a lower supporting adjusting and fixing plate 35-2 so that the distance between the liquid crystal panel 6 and the projection lens 2 can be changed slightly, and the liquid crystal panel with respect to the cross dichroic mirror can be changed. 6 is an explanatory diagram of a state when the configuration of FIG. 6 can be changed slightly.

In this configuration, the position of the liquid crystal panel 6 in the direction perpendicular to the panel surface is moved by adjusting the distance 50 between the fixed plate 35-1 and the fixed plate 35-2 with the screw 51. . Maintaining the interval 50 is mainly performed by the spring-like object 52 disposed between the fixing plates 35-1 and 35-2 during adjustment, and after the adjustment, the projecting screw 53 is attached to the rear surface 35- of the fixing plate 35-1. 3 so that the distance 50 does not change.

Incidentally, the outer surface of the cross-shaped dichroic mirror-supporting frame 3 may have the function of the lower support adjustment fixing plate 35-2, and the fixing plate 35-2 may be omitted. is there. In FIG. 11, screw holes 48'-2 having spring properties in the radial direction are provided with fixing plates 35-1 and 35-1.
2 shows a case where the liquid crystal panel 6 is formed instead of the liquid crystal panel 6.

As described above, it is possible to move each liquid crystal panel in each direction by a very simple mechanism by a small amount, and as a result, a liquid crystal panel integrated cruciform dichroic mirror capable of adjusting the convergence of a three-color projected image. -A structure can be obtained.

[0047] Figure 12 is a cross-shaped dichroic mirror shown in FIG. 4 - Oh a perspective view showing a specific configuration of the support frame
You. The cross-shaped dichroic mirror-supporting frame shown in FIG. 12 is basically formed by combining two blocks 55 and 56.

FIG. 13 is a perspective view showing the support frame shown in FIG. 12 in which two blocks 55 and 56 are separated. As an example of a method of assembling the cross-shaped dichroic mirror-supporting frame of FIG. 12, two blocks 55 and 56 shown in FIG.
1 and 66-1, 65-2 and 66-2 are fixed with screws, wedges or adhesives (not shown).

The mirror fixing surfaces 57, 58, 59, 60
The notch 61, a notch 61, on the surface for fixing the end of each dichroic mirror constituting the cross-shaped dichroic mirror.
Reference numeral 62 denotes a portion through which a dichroic mirror fixed to the mirror fixing surfaces 57 and 58 passes. In this configuration, it is easy to make the plane accuracy of the mirror fixing surfaces 57 and 58 and the plane accuracy of the mirror fixing surfaces 59 and 60 sufficient, by applying a fixed plate as a jig. Therefore, each dichroic mirror can be arranged and fixed without distortion.

However, since the cross-shaped dichroic mirror supporting frame shown in FIG. 12 is formed by combining two blocks 55 and 56, there is a concern that the cross angle formed by each dichroic mirror is shifted by more than 90 degrees. Is done. However, even if the configuration angle of the cross-shaped dichroic mirror is slightly deviated from 90 degrees, it is possible to match the convergence of the three-color projection image 32 by changing the liquid crystal panel position to an appropriate position. Absent.

FIG. 15 shows a red dichroic mirror and a red dichroic mirror forming a cross-shaped dichroic mirror.
26, dichroic mirror that reflects blue light and transmits green light
27 shows the arrangement of the display images 23, 24, and 25 that can match the convergence of the three-color projection image 32 when the crossing angle of 27 is shifted by 90 degrees from 90 degrees.

In FIG. 15, the red light-reflecting and green light-transmitting dichroic mirror 26 has a predetermined arrangement angle 26-1.
Shows a case in which the lens is rotated clockwise by θ degrees from the position and reaches the position 26-2. In the case of the dichroic mirror arrangement 26-2 rotated by θ degrees, the red display image 23 is arranged at a position rotated by 2θ degrees around the cross point 70 of the cross-shaped dichroic mirror so that the red display image 23 is The dichroic mirror 26 can be positioned symmetrically with the green display image 24, so that the red projection image,
The convergence of the green projected image can be adjusted. Therefore, the convergence of the three-color projection image 32 can be adjusted.

When the blue light reflecting and green light transmitting dichroic mirror 27 is rotated by a certain angle, the red light reflecting, green light transmitting dichroic mirror 26 and the blue light reflecting and green light transmitting dichroic mirror 27 are rotated. Both are
Even when each of them is rotated by a certain angle, the convergence of the three-color projection image 32 can be adjusted by the above method.

Next, as a specific example, the diagonal of the display images 23, 24 and 25 of each liquid crystal panel is 5 inches, and each display image 2
When the distance between 3, 24, 25 and the cross point 70 of the cross-shaped dichroic mirror is 80 mm, and the rotation angle of the red and green light transmitting dichroic mirror 26 from a predetermined position is 1 degree, -Determine the x, y coordinate positions of the red display image 23 for adjusting the sense.

Since the display images 23, 24, and 25 have a diagonal of 5 inches, their vertical length is 76.2 mm.
It is. Also, from the above examination results, the image having a length of 76.2 mm may be rotated twice to adjust the convergence. Therefore, one end 23-1 of the image is located at a position shifted by -2.8 mm in the x direction and 1.4 mm in the y direction from the original position, and the other end is located in the x direction from the original position in the x direction.
What is necessary is just to arrange | position to the position which moved 2.8 mm and -1.4 mm in the y direction. These movement amounts can be sufficiently handled by the liquid crystal panel position adjustment / fixing means described with reference to FIGS.

In the above description, the cross-shaped dichroic mirror having two blocks as the supporting frame has been described. However, if the cross-shaped dichroic mirror attached to the supporting frame can be structured so as not to cause distortion, three or more blocks may be used. And a cross-shaped dichroic mirror structure having a liquid crystal panel attached thereto.

Further, in the above description, it has been described on the assumption that all three liquid crystal panels attached to the cross-shaped dichroic mirror-supporting frame have a position adjustable structure. Convergence adjustment is also possible with a mechanism that allows the position adjustment of the other two liquid crystal panels, and such a configuration may be employed.

[0058]

Since the projection type liquid crystal display device according to the present invention is constructed as described above, it has the following advantages. That is, the cross-shaped dichroic mirror
The frame is basically composed of two blocks.
Each dichroic composing the character-shaped dichroic mirror
The mirror is configured to maintain sufficient flatness. The liquid crystal panel is also integrally mounted on the cross dichroic mirror structure for synthesizing the three-color image light, so that it can be easily projected before mounting it on the projection type liquid crystal display device. The convergence adjustment and the focus adjustment of the three-color projection image can be performed by setting the convergence adjustment jig including a device or the like.

Setting the cross-shaped dichroic mirror structure on a convergence adjusting jig composed of a simple projection device or the like and performing the adjustment is compared with a method of attaching the cruciform mirror structure to a projection type liquid crystal display device and performing the adjustment. Adjustment is easy, and high-precision adjustment is possible.

By attaching the adjusted liquid crystal panel-integrated cross dichroic mirror structure to the projection-type liquid crystal display device, a projection image with a proper convergence can be obtained without further adjustment. .

For adjusting and fixing the position of the liquid crystal panel, the liquid crystal panel frame, in which adjusting screws, elastic materials and the like are attached to one or two rigid frames, is basically applied. Panel position adjustment and fixing structure can be made very simple. As described above, in addition to achieving high image quality of the projection type liquid crystal display device, it is also possible to achieve compactness, assembling workability, and improvement in maintenance serviceability.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a cross-shaped dichroic mirror structure as a main part of one embodiment of the present invention.

FIG. 2 is a schematic sectional view showing the vicinity of a cross-shaped dichroic mirror structure in a projection type liquid crystal display device according to one embodiment of the present invention.

FIG. 3 is a partial sectional view showing an attached state of a cross-shaped dichroic mirror structure in a projection type liquid crystal display device.

FIG. 4 is an explanatory view of a specific method of assembling a cross-shaped dichroic mirror structure used in the present invention.

FIG. 5 is a front view showing a liquid crystal panel frame assembly in a cross-shaped dichroic mirror structure.

FIG. 6 is a sectional view taken along line XX in FIG.

FIG. 7 is a sectional view taken along line YY in FIG. 5;

FIG. 8 is a front view showing another example of the liquid crystal panel frame assembly in the cross-shaped dichroic mirror structure.

FIG. 9 is a sectional view taken along line XX in FIG.

FIG. 10 is an enlarged cross-sectional view of a portion where a peripheral non-display portion of the liquid crystal panel is pressed on a liquid crystal panel support adjustment fixing plate by a liquid crystal panel holding plate and a spring material.

FIG. 11 is a sectional view showing another specific example of a liquid crystal panel support adjustment fixing plate and its vicinity.

[12] a cross-shaped dichroic mirror - Specific support frame
FIG. 3 is a perspective view showing a typical configuration example .

FIG. 13 is a perspective view showing a state in which the support frame body shown in FIG. 12 is separated into two blocks.

FIG. 14 is a cross-shaped dichroic mirror capable of matching the convergence of three color images of red, green and blue.
And a schematic diagram of the arrangement of the image.

FIG. 15 is a view showing a display image in which the convergence of a three-color projection image can be adjusted when the crossing angle between two dichroic mirrors constituting a cross-shaped dichroic mirror is shifted from 90 degrees by θ degrees; It is the schematic diagram which showed arrangement.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cross dichroic mirror structure, 2, 2 '... Projection lens, 3 ... Dichroic mirror-support frame, 4,
5, 6 liquid crystal panel, 7 red light, 8 green light, 9 blue light, 11 light source, 23, 24, 25 display image, 32
... Enlarged projected image, 33, 34, 35 ... Liquid crystal panel support adjustment fixing plate, 36, 37, 37 '... Dichroic mirror, 40, 41 ... Liquid crystal panel holding plate, 45-1, 45-
2, 46-1, 46-2, 46'-2, 47-1, 47
-2, 47-3, 47-4, 47-5, 47-6, 47
-7, 47-8, 52 ... spring-like object, 55, 56 ... cross-shaped dichroic mirror-support frame constituting block, 57,
58, 59, 60: mirror fixed surface, 80: cross-shaped dichroic mirror

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Shigeru Mori 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Within Hitachi Media Media Research Laboratories, Inc. (56) References Japanese Utility Model No. 1-63276 (JP, U) Kaihei 2-113774 (JP, U) (58) Fields studied (Int. Cl. ⁶ , DB name) G02F 1/13 505 G02F 1/1347 G02F 1/1335-1/1335 530 G03B 33/12 H04N 9 / 31

Claims (1)

(57) [Claims] 1. Three liquid crystal panels for displaying images of red, green, and blue, respectively, and white light from a light source is separated into red, green, and blue light and incident on the corresponding liquid crystal panels. Optical system, a cross-shaped dichroic mirror that receives and combines and outputs image light from the liquid crystal panels of red, green, and blue, and a projection that projects a combined image from the dichroic mirror toward a screen And a lens, wherein the cross-shaped dichroic mirror has different color light transmission and reflection wavelength bands for incident light.
Two dichroic mirrors, a dichroic mirror
First block for support, second for dichroic mirror support
Attached to each block and arranged almost in a cross shape
And at the same time, the liquid crystal panels are
For the two dichroic mirrors arranged,
Each is arranged on the corresponding image light incident surface, and in that state, the die
1st block for supporting Croic mirror, dichroic
From the configuration attached to the mirror support second block
A projection type liquid crystal display device comprising: