JPH04120933U - liquid crystal display device - Google Patents

Abstract

(57) [Summary] [Purpose] To facilitate the manufacturing process of a reflecting member (cylindrical reflecting part) for covering the light incident part of a light guide plate in a liquid crystal display device, and to reduce costs. [Structure] A cylindrical reflection part 6 for covering the light incident part 2a of the light guide plate 2 installed on the back side of the liquid crystal panel is formed in the same body as the reflection plate 4, and the cylindrical reflection part is divided into approximately quarters. The back side semicircular part 6a formed in a circular shape and the front side semicircular part 6b formed in a substantially semicircular shape are folded over each other via a hinge part 6c.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

In this invention, a light guide plate is installed on the back side of the liquid crystal panel, and at least one part of the light guide plate is A back panel in which the side edge is used as a light incident part and a reflective plate is installed on the back side of the light guide plate. The present invention relates to a light-type transmissive liquid crystal display device.

0002

[Conventional technology]

This type of liquid crystal display device is disclosed in, for example, Japanese Unexamined Patent Publication No. 1-245220. What is known is what is known. However, in this type of liquid crystal display device, the efficiency of light incident on the light incidence part of the light guide plate is In order to improve this, it is preferable to cover the light incident part of the light guide plate with a reflective member.

0003 Therefore, in the past, a reflective member for covering the light incident part of the light guide plate was The ends of the reflector installed on the back are integrally glued together by manual post-processing. It was tied. For this reason, there was a problem in that it took a lot of time and effort to manufacture, leading to high costs.

0004

[Problem that the idea aims to solve]

The present invention was developed in view of such conventional problems, and it is The reflective member used to cover the light guide plate is formed into the same body as the reflective plate installed on the back side of the light guide plate. As a result, it can be manufactured with simple labor and costs can be reduced. The purpose of this invention is to provide a liquid crystal display device.

[0005]

[Means to solve the problem]

The liquid crystal display device of the present invention that achieves this purpose is installed on the back of the liquid crystal panel. At least one side edge of the light guide plate is used as a light incident part, and a reflection plate is provided on the back side of the light guide plate. In the backlight type liquid crystal display device installed, a light guide plate is attached to the reflective plate. A cylindrical reflection part for covering the light incident part is installed in the same body, and the cylindrical reflection part A semicircular part on the back side formed in a substantially quarter-circle shape and a semicircular part on the front side formed in a substantially semicircular shape. It is characterized by being formed by folding the two together via the hinge part.

[0006]

【Example】

An example of implementing the present invention will be described below based on the drawings. 1 in the figure is a normal liquid crystal panel, which is installed on the front side of the light guide plate 2 via a diffuser plate 3. be done.

[0007] The light guide plate 2 is made of a transparent resin material such as transparent acrylic resin or polycarbonate resin. is formed into a rectangular flat plate shape using at least one side edge (in the illustrated embodiment). The left and right side edges) are used as the light incidence part 2a, and the liquid is supplied to the front side through the diffuser plate 3. A reflective plate 4 is installed on the back side of the crystal panel 1, and a light source 5 is installed just before the light incidence part 2a. The light incident part 2a including the light source 5 is covered with a cylindrical reflecting part 6.

[0008] The reflector plate 4 is for reflecting the light inside the light guide plate 2 toward the front side, that is, towards the liquid crystal panel 1. It is made of heat-resistant thermoplastics such as polyester resin and polycarbonate resin. A plastic resin film is used to form a mirror surface (the surface facing the light guide plate 2). At the same time, a cylindrical reflection part 6 for covering the light incident part 2a of the light guide plate 2, and a light guide plate 2 are provided. A reflective standing wall 8 for covering the end face portion of the mirror is formed extending from the same body.

[0009] As shown in FIGS. 2 and 3, the cylindrical reflecting section 6 has a substantially quarter-circular shape on the back side. Fold the semicircular part 6a and the front semicircular part 6b, which is formed into a substantially semicircular shape, through the hinge part 6c. When forming the reflector plate 4 using the vacuum forming method, the same mold into the body. That is, the cylindrical reflecting portion 6 extends from the edge of the reflecting plate 4 and has a substantially quarter-circular shape. from the back side semicircular part 6a formed in the rear side semicircular part 6a to the hinge part 6c. and a front side semicircular part 6b formed in a substantially semicircular shape, which is connected to the same body. After installing the light guide plate 2 on the radiation plate 4 and installing the light source 5 on the light incidence part 2a of the light guide plate 2, The surface-side semicircular part 6b is folded over the light guide plate 2 from the hinge part 6c to form a light incident part of the light guide plate 2. It is formed so that it can cover 2a.

0010 In order to improve the efficiency of light incident on the light incidence part 2a of the light guide plate 2, A high reflection film 7 made of silver foil or the like is installed on the inner surface of the cylindrical reflection part 6. At this time, Before covering the light incidence part 2a of the light guide plate 2 with the cylindrical reflection part 6, a portion of the high reflection film 7 is coated. The end 7a is attached in advance to the end 6a' of the front side semicircular part 6b that constitutes the cylindrical reflection part 6. I'll keep it. Then, the front side semicircular part 6b of the cylindrical reflection part 6 is folded onto the light guide plate 2. The highly reflective film 7 naturally covers the light incident part 2a of the light guide plate 2 when it is folded. Therefore, the high reflection film can be easily installed on the inner surface of the cylindrical reflection section 6.

[0011] Also, in order to prevent the light incident on the light guide plate 2 from leaking out from the end surface, A reflective stand is provided on the peripheral edge of the reflective plate 4 to cover the end face of the light guide plate 2 other than the light incident part 2a. The wall 8 and the cylindrical reflecting portion 6 are simultaneously formed upright into the same body by vacuum forming.

0012

[Effect of the idea]

The liquid crystal display device of the present invention thus includes a reflective member for covering the light incident part of the light guide plate. (cylindrical reflecting part) is formed to extend into the same body as the reflecting plate installed on the back side of the light guide plate. Therefore, unlike conventional methods, it is not possible to integrally bond the reflective member to the end of the reflector plate in post-processing. In addition, the cylindrical reflective part is formed into a substantially quarter-circular shape with a semicircular part on the back side. It is formed by folding the front side semicircular part formed into a substantially semicircular shape through the hinge part. Therefore, the shape of the cylindrical reflective part with high reflection efficiency is reflected by vacuum forming method etc. It can be formed into one and the same piece as the plate, and as a result it is very easy to manufacture as a whole. Therefore, it is possible to reduce costs.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of implementing the present invention.

FIG. 2 is an enlarged cross-sectional view of a cylindrical reflecting section.

FIG. 3 is an enlarged cross-sectional view of the cylindrical reflection section in an open state.

[Explanation of symbols]

1: Liquid crystal panel 2: Light guide plate 2
a: Light incidence part 3: Diffusion plate 4: Reflection plate
5: Light source 6: Cylindrical reflection part 6a: Back side semicircular part 6
b: Front semicircular part 6c: Hinge part 7: Highly reflective film
8: Reflection standing wall

Claims (1)

[Scope of utility model registration request] 1. A backlight system in which a light guide plate is installed on the back side of a liquid crystal panel, at least one side edge of the light guide plate is used as a light incident part, and a reflecting plate is installed on the back side of the light guide plate. In the liquid crystal display device, a cylindrical reflective part for covering the light incident part of the light guide plate is extended to the reflective plate, and the cylindrical reflective part is formed in a substantially quarter-circular shape. A liquid crystal display device characterized in that a side semicircular part and a front semicircular part formed in a substantially semicircular shape are folded together via a hinge part.