JP3018641B2 - 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 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 polarizing plate is disposed on both front and rear surfaces of a liquid crystal display panel (liquid crystal cell), and a backlight or a reflecting plate is disposed on the rear surface side. Has become. In such a liquid crystal display device, in order to enlarge the viewing angle, a viewing angle enlargement plate made of a light scattering plate or the like such as frosted glass is arranged on the surface side of the liquid crystal display panel, and in order to enlarge the image. There is a liquid crystal display panel in which an image magnifying plate made of a Fresnel lens or the like is arranged on the surface side of a liquid crystal display panel.

[0003]

However, in such a conventional liquid crystal display device, a viewing angle magnifying plate and an image magnifying plate are stacked and arranged on the surface side of the liquid crystal display panel, so that the number of parts is reduced. In addition, there is a problem that the thickness is increased. It is an object of the present invention to provide a liquid crystal display device capable of reducing the number of parts and reducing the thickness.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a liquid crystal display panel.
And the viewing angle arranged on the display surface side of the liquid crystal display panel
And an image magnifying plate.
The plate has an arc-shaped convex head and bottom, and has a length
A large number of transparent thin plates which are substantially the same as one side of the liquid crystal display panel and whose plate thickness is larger on the head side than on the bottom side are closely bonded in the thickness direction, and the bottom side is displayed on the liquid crystal display panel . those arranged in surface to surface side.

[0005]

According to the present invention, a number of transparent thin plates having an arc-shaped convex head and a flat bottom are formed so that the thickness of the thin plate is larger at the head than at the bottom. Each transparent thin plate performs the function of an optical fiber, and the viewing angle in the thickness direction of the transparent thin plate can be significantly expanded, and the transparent The image in the thickness direction of the thin plate can be enlarged, so that the number of parts can be reduced and the thickness can be reduced.

[0006]

1 and 2 show a main part of a liquid crystal display device according to an embodiment of the present invention. In this liquid crystal display device, polarizing plates 2 and 3 are disposed on both front and rear surfaces of a liquid crystal display panel (liquid crystal cell) 1, a backlight 4 is disposed on a rear surface side, and a viewing angle and image magnifying plate 5 is disposed on a front surface side. Structure. The liquid crystal display panel 1 has a structure in which a liquid crystal 13 is sealed between two transparent electrode substrates 11 and 12. The viewing angle and image magnifying plate 5 has a structure in which a large number of transparent thin plates 21 made of an acrylic resin or the like are closely bonded to each other with an isolation film 22 interposed therebetween. Each transparent thin plate 21 has an arc-shaped convex head 21a and a mirror-like flat surface bottom 21b.
It gradually increases from the b side toward the head 21a side. Also, a pair of side portions 21c, 21 along the longitudinal direction
d is also a mirror surface. The isolation film 22 is formed of each transparent thin plate 21.
This is to block an image incident on the transparent thin plate 21 from being incident on the adjacent transparent thin plate 21, and is formed by a thin sheet or thin film. Specifically, white or black paper or a resin sheet can also be used.
It is desirable to use a metal reflection film in order to effectively reflect the mirror image reflected on 21d. Such a metal reflective film is formed by plating, painting,
Although it can be formed by various methods such as printing,
As an efficient method, a physical vapor deposition method such as vacuum vapor deposition or sputtering is recommended. In this case, the metal reflection film is formed of each transparent thin plate 2.
It may be formed on both sides 21c and 21d, or may be formed only on one side 21c or 21d. In order to obtain the viewing angle and the image magnifying plate 5 by bringing the transparent thin plates 21 into close contact with each other, the transparent thin plates 21 having the side portions 21c and 21d on which the isolation film 22 such as a metal reflection film is formed have the bottom 21b forming one plane. It is sufficient that they are adhered to each other and bonded with an adhesive or the like.
In addition, the bottom 21b of each transparent thin plate 21 may not be mirror-shaped at first, but may be efficiently polished and mirror-polished on the entire surface after close bonding. However, the side portions 21c and 21d
Must be mirror-finished prior to close bonding. As an example, the dimensions of the transparent thin plate 21 are such that the length L is 80 mm corresponding to the size of the liquid crystal display panel 1, the height H after close bonding is 4 mm, and the thickness T of the thinnest bottom 21b is 0.3.
２．０2.0 mm. The thickness T of the thinnest bottom portion 21b of the transparent thin plate 21 is set at a pixel dot pitch of 0.1 to 0.1.
It may be equal to or less than about 2 mm, but if it is larger than the pitch of the pixel dots, it is easy to manufacture and it can be inexpensive. The arc-shaped convex surface of the head 21a of the transparent thin plate 21 is a perfect circular convex surface.

In this liquid crystal display device, the flat bottom portion 21b
A number of transparent thin plates 21 whose thickness gradually increases from the side toward the arc-shaped head 21a are closely bonded in the thickness direction, and the outer surfaces of the transparent thin plates 21 between the adjacent transparent thin plates 21 and on both sides. The transparent thin plate 21 functions like an optical fiber, for example, as shown by a solid line or a dotted arrow in FIG. Isolation membrane 22 for
Is reflected from the arc-shaped convex surface of the head 21a of the transparent thin plate 21, and the viewing angle in the thickness direction of the transparent thin plate 21 can be remarkably enlarged. In this case, the image incident on each transparent thin plate 21 and reflected by the side portions 21 c and 21 d is separated from the adjacent transparent thin plate 21 by the isolation film 22, so that it can be clearly recognized. When the isolation film 22 is a metal reflection film, the reflection images by the side portions 21c and 21d become clearer. Further, since the thickness of each transparent thin plate 21 is gradually increased from the bottom 21b side toward the head 21a side, the image in the thickness direction of the transparent thin plate 21 can be enlarged. Further, since a light scattering plate such as frosted glass is not used, the image is not whitened and the contrast can be increased. Furthermore, since the transparent thin plate 21 is literally a thin plate, it is easy to make close contact bonding, and therefore, it is possible to improve productivity.

In the above embodiment, one viewing angle and image magnifying plate 5 is arranged on the surface side of one liquid crystal display panel 1, but one image is displayed on a plurality of liquid crystal display panels. It can also be applied to large cinerama panels.
For example, as shown in FIGS. 3 and 4, nine liquid crystal display panels 1 are arranged side by side in the horizontal direction and the vertical direction on the same plane, each having three viewing angles. It is also possible to arrange the image magnifying plate 5 such that the heads 21 a of the nine liquid crystal display panels 1 are in close contact with each other, and one large backlight 4 is arranged on the back side of the nine liquid crystal display panels 1. In this case, when the viewing angle and the image in the horizontal direction are enlarged by nine viewing angle and image magnifying plates 5, the liquid crystal display panels 1 in the horizontal direction are arranged at predetermined intervals, and the liquid crystal display panels in the vertical direction are arranged. 1 will be arranged closely. Left and right liquid crystal display panel 1
Are arranged at predetermined intervals, there is a gap between them. However, since the image is enlarged in the left-right direction by the viewing angle and the image magnifying plate 5, the gap between the liquid crystal display panels 1 is not visible, and a beautiful image is formed. Is obtained. FIG. 4 shows each liquid crystal display panel 1.
When a non-display area as indicated by a dotted line is provided, the liquid crystal display panels 1 in the left-right direction can also be arranged in close contact with each other, but also in this case, the non-display areas of each liquid crystal display panel 1 are not seen.

In the above embodiment, the liquid crystal display panel 1
The view angle and the image magnifying plate 5 are arranged on the surface side of the transparent plate 21, and the view angle and the image in the thickness direction of the transparent thin plate 21 constituting the view angle and the image magnifying plate 5 are enlarged. It is not something to be done. For example, although not shown, a configuration may be adopted in which two viewing angle and image magnifying plates are arranged on the surface side of the liquid crystal display panel so as to be orthogonal to each other and superposed. In this way, the horizontal viewing angle and the image can be enlarged by the lower viewing angle and the image magnifying plate, and the vertical viewing angle and the image can be enlarged by the upper viewing angle and the image magnifying plate. Can be.

Further, in the above embodiment, the arc-shaped convex surface of the transparent thin plate 21 is a perfect circular convex surface. However, the present invention is not limited to this, and may be, for example, an elliptical convex surface or a parabolic convex surface. Also, a composite convex surface combining various convex surfaces such as a perfect circular convex surface, an elliptical convex surface, and a parabolic convex surface may be used. In this case, the arc-shaped convex shape of each transparent thin plate 21 is such that mirror images obtained at the side portions 21 c and 21 d of the transparent thin plate 21 can be sufficiently distinguished from light incident on the adjacent transparent thin plate 21. With this configuration, the isolation film 22 can be omitted. Further, the height of the transparent thin plate 21 after the close contact bonding is all the same, but for example, as shown in FIG. On the 21a side, the central portion may be inclined.

[0011]

As described above, according to the present invention, a large number of heads each having an arc-shaped convex head and a flat bottom are provided, and the thickness of the head is larger at the head than at the bottom. Because a viewing angle and an image magnifying plate are used in which the transparent thin plate is closely bonded in the thickness direction, the viewing angle and the image in the thickness direction of the transparent thin plate can be enlarged with one viewing angle and the image magnifying plate. Therefore, the number of parts can be reduced and the thickness can be reduced.

[Brief description of the 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 cross-sectional view of a part 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 cinema panel.

FIG. 4 is a plan view of a part of FIG. 3;

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2, 3 Polarizing plate 4 Backlight 5, 6 Viewing angle and image magnifying plate 21 Transparent thin plate 22 Isolation film

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1335 G02B 5/02 G02B 6/08

Claims (5)

(57) [Claims] 1. A liquid crystal display panel and a display of the liquid crystal display panel
A viewing angle and an image magnifying plate arranged on the surface side.
The viewing angle and image magnifying plate has a head and a bottom that are arc-shaped convex surfaces, and the length is one side of the liquid crystal display panel.
Substantially same as and and thickness is in close contact bonding a large number of transparent thin plate head side is larger than the bottom side in the thickness direction, its
The liquid crystal display device in which the bottom side, characterized in that arranged in surface to the display surface side of the liquid crystal display panel. 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 made of a metal deposited thin film. 4. The liquid crystal display device according to claim 1, wherein the thickness of the thinnest bottom portion of the transparent thin plate is equal to or greater than the pitch of the pixel dots of the liquid crystal display panel. 5. A plurality of said liquid crystal display panels and said plurality of viewing angle / image enlargement plates, and a plurality of said viewing angle / images are provided for each of said plurality of liquid crystal display panels arranged in the same plane. 2. The liquid crystal display device according to claim 1, wherein the magnifying plate is arranged such that the heads are in close contact with each other.