JPH0572527A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [Purpose] Enlarge the image using a special image magnifier. [Structure] The image magnifying plate 3 arranged on the surface of the liquid crystal display panel 1 has a flat head 2 from the flat bottom 21b side.
It has a structure in which a large number of transparent thin plates 21 each having a plate thickness gradually increasing toward the 1a side are closely bonded to each other with an isolation film 22 interposed therebetween. Each transparent thin plate 21 functions like an optical fiber, and the light reflected by the isolation film 22 for reflection is emitted from the head portion 21a of the transparent thin plate 21 as indicated by, for example, a solid line, an alternate long and short dash line or a dotted line arrow. Then, the image in the thickness direction of the transparent thin plate 21 is enlarged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used in a liquid crystal television or the like.

[0002]

2. Description of the Related Art A liquid crystal display device used in a liquid crystal television or the like generally has a structure in which a backlight or a reflector is arranged on the back side of a liquid crystal display panel. Some of such liquid crystal display devices have a magnifying lens arranged on the front surface side of a liquid crystal display panel in order to magnify an image.

[0003]

However, in such a conventional liquid crystal display device, in order to magnify an image, a magnifying lens is arranged at a position apart from the image display surface of the liquid crystal display panel to some extent. As an example, in the case of obtaining an image of 2 times (4 times in area), if the viewpoint is located at a position 25 cm away from the image display surface of the liquid crystal display panel,
The focal length of the magnifying lens must be 12.5 cm, and therefore the magnifying lens is arranged at a position 12.5 cm away from the image display surface of the liquid crystal display panel. Thus, if the magnifying lens is arranged at a position apart from the image display surface of the liquid crystal display panel to some extent, not only the device becomes considerably thick, but there is no problem when viewed from the front, but when viewed from an angle, There is a problem that a part of the image on the liquid crystal display panel protrudes from the magnifying lens and a part of the image is lost. An object of the present invention is to provide a liquid crystal display device which can be made thin and in which a part of an image is not lost even when viewed obliquely.

[0004]

SUMMARY OF THE INVENTION According to the present invention, there is provided an image magnifying plate in which a large number of transparent thin plates whose plate thickness is larger on the head side than on the bottom side are closely bonded to each other in the thickness direction. It is placed on the panel directly or through a transparent protective plate.

[0005]

According to the present invention, since an image magnifying plate is used in which a large number of transparent thin plates whose thickness is larger on the head side than on the bottom side are closely bonded in the thickness direction, each transparent thin plate is It functions like a fiber and can magnify the image in the thickness direction of the transparent thin plate, and even when viewed from diagonally in the thickness direction of the transparent thin plate, there is no loss of part of the image. Since the bottom portion is placed on the liquid crystal display panel directly or via the transparent protective plate, the thickness can be reduced.

[0006]

1 and 2 show the essential parts of a liquid crystal display device according to an embodiment of the present invention. In this liquid crystal display device, the backlight 2 is arranged on the back surface side of the liquid crystal display panel 1, and the image magnifying plate 3 is arranged on the front surface. Among them, the liquid crystal display panel 1 has a structure in which a liquid crystal 13 is enclosed between two transparent electrode substrates 11 and 12, and polarizing plates 14 and 15 are arranged on both front and back surfaces thereof.

The image magnifying plate 3 has a structure in which a large number of transparent thin plates 21 made of acrylic resin, polycarbonate or the like are adhered to each other with an isolation film 22 interposed therebetween. Each transparent thin plate 21 has a flat mirror-finished head portion 21a and a flat mirror-finished bottom portion 21b, and the plate thickness gradually increases from the bottom portion 21b side toward the head portion 21a side. Also, a pair of side portions 21c along the longitudinal direction,
21d is also a mirror surface. The isolation film 22 is for blocking the image incident on each transparent thin plate 21 so as not to be incident on the adjacent transparent thin plate 21, and is formed of a thin sheet or a thin film. Specifically, white or black paper or resin sheet may be used, but it may be directly applied to the transparent thin plate 21 by plating, painting, printing, transferring, or the like. Further, in order to effectively reflect the mirror image reflected on the side portions 21c and 21d, a metal reflection film may be used, and such a metal reflection film may be a physical vapor deposition method such as vacuum deposition or sputtering of aluminum, nickel, silver or the like. May be deposited by. In this case, the metal reflection film may be formed on both side portions 21c and 21d of each transparent thin plate 21, but one side portion 21c may be formed.
It may be formed only on c or 21d.

In order to obtain the image enlarging plate 3 by bringing the transparent thin plates 21 into close contact with each other, the transparent thin plates 21 having the isolation films 22 such as metal reflection films on the side portions 21c and 21d are attached to the head 21a and the bottom 21b. They may be closely attached to each other so as to form a single plane, and may be adhered by an adhesive or the like. Also, prepare each transparent thin plate 21 that is somewhat higher than the final height,
It is also an efficient method to cut the head portion 21a side and the bottom portion 21b side after the close bonding and polish both of these cut surfaces into mirror surfaces. However, the side portions 21c and 21d need to be mirror-finished before they are closely joined.

The size of the transparent thin plate 21 is, for example, 80 mm in length corresponding to the size of the liquid crystal display panel 1, 4 mm in height after close bonding, and the thinnest bottom 21b.
Has a thickness of 0.3 to 2.0 mm. Transparent thin plate 2
The thickness of the thinnest bottom 21b of 1 may be equal to or less than the pitch of pixel dots of about 0.1 to 0.2 mm, but if it is larger than the pitch of pixel dots, it is easy to manufacture and inexpensive. You can In addition, each transparent thin plate 21
Is the thickest on the side of the head portion 21a, which is the thinnest bottom portion 21b.
The thickness is about 1.1 to 3 times.

In this liquid crystal display device, a large number of transparent thin plates 21 whose plate thickness gradually increases from the bottom 21b side toward the head 21a side are closely joined in the thickness direction, and between adjacent transparent thin plates 21 and Since the image magnifying plate 3 having the structure in which the isolation films 22 are provided on the outer surfaces of the transparent thin plates 21 on both sides is used, each transparent thin plate 21 performs a light guiding function like an optical fiber, and for example, a solid line and a dashed line in FIG. Alternatively, as shown by a dotted arrow, the light reflected by the reflecting isolation film 22 is emitted from the head 21 a of the transparent thin plate 21. In this case, the light enters each transparent thin plate 21, and the side portions 21c, 21
The image reflected at d is isolated from the adjacent transparent thin plate 21 by the isolation film 22, and thus can be clearly viewed.
When the isolation film 22 is a metal reflection film, the side portions 21c, 2
The reflected image by 1d becomes clearer. Moreover, since the plate thickness of each transparent thin plate 21 gradually increases from the bottom portion 21b side toward the head portion 21a side, the image in the thickness direction of the transparent thin plate 21 is enlarged.

Further, in this liquid crystal display device, since each transparent thin plate 21 performs a light guiding function like an optical fiber, even when viewed obliquely in the thickness direction of the transparent thin plate 21, for example, it is shown by an alternate long and short dash line arrow in FIG. As described above, the image at the end portion of the liquid crystal display panel 1 can be visually recognized clearly, and therefore, even when viewed obliquely in the thickness direction of the transparent thin plate 21, a part of the image is not chipped. Furthermore, since each transparent thin plate 21 functions like an optical fiber, the bottom portion 21b of the image magnifying plate 3 can be placed directly on the surface of the liquid crystal display panel 1, and therefore, as compared with the case where a magnifying lens is used, It can be thinned. Even when a transparent protective plate made of acrylic resin, polycarbonate, glass or the like is interposed between the bottom portion 21b of the image magnifying plate 3 and the surface of the liquid crystal display panel 1, compared with the case of using the magnifying lens. Therefore, it can be made thinner.

By the way, in this liquid crystal display device, as described above, the image in the thickness direction of the transparent thin plate 21 is enlarged. Therefore, if left as it is, for example, the image in the left-right direction is enlarged, the image in the up-down direction becomes the actual size, and there is a possibility that the image becomes heterogeneous. To avoid this, the pixel pitch in the vertical direction of the liquid crystal display panel 1 is enlarged or the pixel pitch in the horizontal direction of the liquid crystal display panel 1 is reduced according to the horizontal enlargement ratio of the image enlargement plate 3. You can do it. Further, although not shown, two image magnifying plates may be placed on the surface of the liquid crystal display panel so as to be orthogonal to each other and stacked directly or through a transparent protective plate. In this way, the image in the left-right direction can be magnified by the lower image magnifying plate, and the image in the vertical direction can be magnified by the upper image magnifying plate.

In the above embodiment, one image magnifying plate 3 is arranged on the front surface side of one liquid crystal display panel 1, but a large cinerama for displaying one image on a plurality of liquid crystal display panels. It can also be applied to panels. For example, as shown in FIG. 3 and FIG. 4, nine liquid crystal display panels 1 are arranged in the horizontal direction and the vertical direction in the same plane, respectively.
They are arranged side by side and placed on the front side of each liquid crystal display panel 1.
It is also possible to arrange two image magnifying plates 3 so that their heads 21a are in close contact with each other, and to arrange one large backlight 2 on the back side of nine liquid crystal display panels 1. In this case, when the images in the horizontal direction are magnified by the nine image magnifying plates 3, the liquid crystal display panels 1 in the horizontal direction are arranged at a predetermined interval, and the liquid crystal display panels 1 in the vertical direction are closely arranged. Will be done. When the liquid crystal display panels 1 in the left-right direction are arranged at a predetermined interval, a gap is formed between them, but since the image magnifying plate 3 enlarges the image in the left-right direction, the gap between the liquid crystal display panels 1 can be seen. No, a beautiful image can be obtained. If each liquid crystal display panel 1 is provided with a non-display area as shown by a dotted line in FIG. 4, the liquid crystal display panels 1 in the left-right direction can be arranged in close contact with each other. The display area is never visible.

Further, in the above embodiment, the heights of the transparent thin plates 21 after the adhesion and joining are all set to be the same, but as shown in FIG. The height may be low, and the central portion may be raised in a semi-cylindrical shape on the head 21a side. In this case, the semicylindrical convex shape of the transparent thin plate 21 may be configured so that the mirror images obtained by the side portions 21c and 21d of the transparent thin plate 21 can be sufficiently discriminated from the light incident on the adjacent transparent thin plate 21. For example, the isolation film 22 can be omitted.

[0015]

As described above, according to the present invention, an image magnifying plate is used in which a large number of transparent thin plates whose plate thickness is larger on the head side than on the bottom side are closely joined in the thickness direction. Since each transparent thin plate functions like an optical fiber, the image in the thickness direction of the transparent thin plate can be enlarged, and a part of the image is missing even when viewed obliquely in the thickness direction of the transparent thin plate. In addition, since the bottom of the image enlarging plate is placed on the liquid crystal display panel directly or via the transparent protective plate, it is possible to reduce the thickness.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of the liquid crystal display device.

FIG. 3 is a front view of a main part when the liquid crystal display device is applied to a large cinerama panel.

FIG. 4 is a plan view of a part of FIG.

FIG. 5 is a sectional view of an essential part of a liquid crystal display device according to another embodiment of the present invention.

[Explanation of symbols]

 1 Liquid crystal display panel 2 Backlight 3 Image magnifying plate 21 Transparent thin plate 22 Separating film

Claims (5)

[Claims] 1. An image magnifying plate comprising a large number of transparent thin plates, the thickness of which is larger on the head side than on the bottom side in the thickness direction, and the image magnifying plate is directly or transparently protected on the liquid crystal display panel. A liquid crystal display device, characterized in that it is mounted via. 2. The liquid crystal display device according to claim 1, wherein an isolation film is provided between the transparent thin plates. 3. The liquid crystal display device according to claim 2, wherein the isolation film is a metal vapor deposition thin film. 4. The liquid crystal display device according to claim 1, wherein the thickness of the thinnest bottom of the transparent thin plate is equal to or larger than the pitch of pixel dots of the liquid crystal display panel. 5. A plurality of liquid crystal display panels and a plurality of image magnifying plates are provided, and a plurality of image magnifying plates are provided for each head of the plurality of liquid crystal display panels arranged side by side on the same plane. The liquid crystal display device according to claim 1, wherein the sides are arranged in close contact with each other.