JPH0572514A - Display device - Google Patents

Abstract

PURPOSE:To rigidly hold a liquid crystal cell having a large display and to facilitate the handling thereof. CONSTITUTION:The liquid crystal cell 1 has glass substrates stuck to each other so as to shift in position from each other. Bosses 32 are provided in correspondence to the corner parts generated by the shift of the substrates of the liquid crystal cell 1. At least the peripheral part of the liquid crystal cell 1 is fixed by a front surface frame 4 fixed to the boss parts 32 of the frame body 3 covering the peripheral part from the front surface side. Further, an illuminating means is housed from the rear surface into the frame body 3. The corners of the substrates of the liquid crystal cell 1 are surely supported by the bosses 32 and the liquid crystal cell 1 is laminated on the frame body 3 from the front surface. On the other hand, the illuminating means is housed from the rear surface and, therefore, the independent handling of the respective parts is possible and the diffusion of heat is easy.

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 having a liquid crystal cell and a lighting means integrally.

[0002]

2. Description of the Related Art Conventionally, in a liquid crystal display device, a liquid crystal cell, a driving element for the liquid crystal cell, and an illuminating means are integrated and supplied in a form that can be easily used in devices such as word processors and personal computers. Such a liquid crystal display is disclosed in, for example, Japanese Patent Laid-Open No. 2-33125, and a driving element is arranged in the peripheral portion of the liquid crystal cell, and the liquid crystal cell and the illuminating means are laminated to form a metal frame or the like. It is something to store.

[0003]

However, in such a liquid crystal display device, the liquid crystal cell has a large display area year by year, and recently, many of them are of B5 to A3 versions. It becomes difficult to support and fix, the display center shifts, the driving element etc. arranged around the liquid crystal cell is damaged by the metal frame, etc., and the conduction failure of the connection part occurs, especially the connection part between the driving element and the liquid crystal cell There was a lot of peeling of the wiring material.

Further, by stacking the liquid crystal cell and the illuminating means, not only the liquid crystal display device becomes thicker, but also if dust or the like is mixed between the liquid crystal cell and the illuminating means, it is projected on the display and the display quality is remarkably deteriorated. However, in order to remove this, almost all the components must be taken out from the metal frame, so not only the workability is bad, but also the wiring material is damaged and the liquid crystal cell is chipped. Furthermore, the illumination means and the bias circuit easily generate heat when the display area and the display capacity increase, and the heat easily accumulates inside the metal frame or the like that accommodates all of them, causing a contrast change due to the temperature dependence of the liquid crystal cell. Causes the display quality to remarkably deteriorate.

[0005]

In view of these points, the present invention has been made paying attention to the fact that the larger the area of the liquid crystal cell is, the stronger the substrate is, and the liquid crystal cell is attached so as to be displaced from each other. A frame arranged on the back surface of the liquid crystal cell having a liquid crystal cell having a plurality of substrates and a boss that accommodates the illumination means from the back surface and is provided corresponding to a corner portion caused by the displacement of the substrates of the liquid crystal cell. A body and a front frame that covers at least the peripheral portion of the liquid crystal cell from the front surface side and is fixed to the boss portion of the frame body are used.

[0006]

As a result, the liquid crystal cell can be securely held because the corners of the substrate are supported by the bosses, and the liquid crystal cell is stacked on the frame from the front side, while the illuminating means is housed from the back side, so that each is It can be handled alone and heat can be easily dispersed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view of a liquid crystal display device according to the present invention, and FIG. 2 is a sectional view of an essential part of the liquid crystal display device. In the figure, reference numeral 1 is a liquid crystal cell, and substrates 11 made up of two rectangular plate glasses are pasted at different positions so that their longitudinal directions are orthogonal to each other, and a twisted alignment liquid crystal is sandwiched between the substrates 11. It is a field effect type called twisted nematic, and if necessary, phase compensating plates are laminated,
It has polarizing plates on the upper and lower sides, and a terminal made of a transparent electrode (not shown) is provided on the periphery thereof.

Reference numeral 2 denotes a drive element which is connected to a terminal in the peripheral portion of the liquid crystal cell 1 directly or by a connecting means such as heat sealing. In the example shown in the figure, TAB (Tape Automated) is used.
Bonding: A driving element using Japanese Patent Laid-Open No. 2-891 etc. is directly fixed, held on the back surface of the printed circuit board 21 and connected thereto. If necessary, a bias circuit or a driving element (not shown) such as a control element is arranged in the vicinity, but if the display capacity becomes large, the load fluctuation becomes large and the bias circuit easily heats up. It is preferably arranged in the peripheral release area of the frame body.

A frame 3 is arranged on the back surface of the liquid crystal cell 1 so as to mount the liquid crystal cell 1 and the driving element 2, and is made of a resin molding or the like and has a through hole 31 in the center and the liquid crystal cell 1
The bosses 32 are provided corresponding to the corners (notched portions in the intersecting protrusions of the upper and lower substrates 11) generated by the displacement of the substrate 11. The frame body 3 is made of ABS resin, polycarbonate resin, or the like, and may be hard or soft. A bridge 33 is provided on one side of the frame body 3 for accommodating a heat generating component or an open area for accommodating a circuit requiring adjustment or a thick component. A terminal 34 for receiving a power source and a signal for driving is fixed. An embedded nut 321 made of brass or the like is press-fitted into the boss 32, and the outer shape is a substantially rectangular parallelepiped so as to contact the side surface of the substrate 11, and is provided at four locations corresponding to the four corners of the liquid crystal cell 1. .. If necessary, a sheet-shaped or rod-shaped cushioning material 51 made of silicon rubber, styrene resin, or the like may be interposed between the liquid crystal cell 1, the driving element 2 or the printed board 21 and the frame body 3.

Illuminating means 6 is further housed in the frame 3 from the back side. The illuminating means 6 is composed of a light guide plate 61 made of a transparent acrylic resin or the like and a linear light source 62 made of a cold cathode tube or the like arranged on the side surface of the light guide plate 61. The light guide plate 61 is fitted into the through hole 31. ing. If necessary, a light diffusion sheet 62 may be laid on the front surface of the light guide plate 61, and a reflection sheet may be attached to the back surface of the light guide plate 61. Also, in the light source 62, a reflection sheet having one end fixed to the light guide plate 61 is not attached to the light source 62. It may be wrapped around the contact. The back surface of such a frame 3 is closed by a back plate 7 made of a metal plate molded product or the like.

Reference numeral 4 denotes a front frame which covers at least the peripheral portion of the liquid crystal cell from the front surface side, which accommodates the liquid crystal cell 1 and the driving element 2, and has a transparent portion for exposing at least the effective display surface of the liquid crystal cell 1 in the central portion. It has a hole 41. Also this front frame 4
Is the boss 32 of the frame body 3 which is in contact with the corner S edge of the liquid crystal cell 1.
It is fixed to the part with screws 52. As a result, a so-called display portion is integrally held. Further, the through hole 41 is formed with a stepped portion 43 toward the inner surface by drawing or the like, and the liquid crystal cell 1 or the liquid crystal cell 1 is directly formed at the stepped portion 43 or at or near the stepped portion 43 via a buffer material 53.
The connection between the drive element 2 and the drive element 2 may be pressed against the frame 3.

[0012]

As described above, according to the present invention, the four notched corners of the substrate of the liquid crystal cell are supported by the bosses, so that even if the display surface becomes large, the effective display surface is not affected and is held securely. There is no possibility that the display center is displaced, the liquid crystal cell is moved after the assembly to damage the driving element or the like, or the conduction failure of the connection portion does not occur.

Further, since the liquid crystal cell is laminated from the front side to the frame body, while the illuminating means is accommodated from the rear side, each can be handled independently, and the workability of each inspection, assembly and repair is good. Also, it is extremely rare that the wiring material is damaged or the liquid crystal cell is chipped. Furthermore, the heat generating parts (circuits and light sources) can be placed in the peripheral release area of the frame or housed so as to be released on the back of the frame, so that the contrast changes due to the temperature dependence of the liquid crystal cell without being stored inside the frame. Therefore, high display quality can be maintained.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a liquid crystal display device of the present invention.

FIG. 2 is a cross-sectional view of essential parts in a fixed portion of the liquid crystal display device of FIG.

[Explanation of symbols]

 1 liquid crystal cell 2 drive element 3 frame 4 front frame 6 illumination means

Front Page Continuation (72) Inventor Norio Otani, Minamiyoshikata 3-chome, Tottori City, Tottori Prefecture Sanyo Electric Co., Ltd. (72) Inventor Masanobu Matsumura 3-201 Minamiyoshikata, Tottori City, Tottori Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A boss that accommodates a liquid crystal cell having a plurality of substrates attached so as to be displaced from each other and an illuminating means from the back surface and is provided corresponding to a corner portion caused by the displacement of the substrates of the liquid crystal cell. And a front frame fixed to a boss portion of the frame body, which covers at least the peripheral portion of the liquid crystal cell from the front surface side and is disposed on the back surface of the liquid crystal cell. ..