JP3021832B2 - Display device - 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 integrally provided with a liquid crystal cell and an illuminating means.

[0002]

2. Description of the Related Art Hitherto, a liquid crystal display device has been provided by integrating a liquid crystal cell, its driving element, and an illuminating means so as to be easily used in devices such as a word processor and a personal computer. Such a liquid crystal display is disclosed in, for example, JP-A-2-33125. However, a driving element is arranged around a liquid crystal cell, and the liquid crystal cell and the illuminating means are laminated to form a metal frame or the like. It is to be stored.

[0003]

However, in such a liquid crystal display device, the liquid crystal cell has a large display area year by year. Recently, many liquid crystal cells of the B5 to A3 sizes have been used. It becomes difficult to support and fix, the display center is shifted, the driving elements and the like arranged around the liquid crystal cell are damaged by a metal frame, etc., and the conduction of the connection part is poor, and especially the connection between the driving element and the liquid crystal cell. Of the wiring material occurred frequently.

Further, not only is the liquid crystal display device thickened by laminating the liquid crystal cell and the illuminating means, 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 of the metal frame, so that not only the workability is poor but also the wiring material is damaged and the liquid crystal cell is chipped. Furthermore, the lighting means and the bias circuit tend to generate heat when the display area and the display capacity are increased, and the heat is trapped inside the metal frame or the like that accommodates all of them, and the contrast is likely to change due to the temperature dependence of the liquid crystal cell. As a result, the display quality is significantly reduced.

[0005]

SUMMARY OF THE INVENTION In view of these points, the present invention has been made in view of the fact that a liquid crystal cell is formed of a substrate which is more durable as the area becomes larger. A liquid crystal cell having a plurality of substrates, and a frame disposed on the rear surface of the liquid crystal cell, the illuminating means being accommodated from the rear surface, and having a boss provided corresponding to a corner generated by displacement of the substrate of the liquid crystal cell. And a front frame that covers at least the periphery of the liquid crystal cell from the front side and is fixed to the boss of the frame.

[0006]

As a result, the liquid crystal cell can be reliably held since 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 illumination means is stored from the back side, so that each of the liquid crystal cells is accommodated from the back side. It can be handled independently and heat dispersion becomes easy.

[0007]

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 a main part of the liquid crystal display device. In the figure, reference numeral 1 denotes a liquid crystal cell, a substrate 11 made of two rectangular plate glasses, which are stuck so that their lengthwise directions are orthogonal to each other, are shifted from each other, and a superposed liquid crystal cell is sandwiched between the substrates 11. It is a field effect type called twisted nematic, and a phase compensator and the like are laminated as necessary,
It has polarizing plates on the upper and lower sides, and terminals around transparent electrodes (not shown) are provided around the polarizing plates.

Reference numeral 2 denotes a driving element which is connected to a peripheral terminal of the liquid crystal cell 1 directly or by a connection means such as a heat seal. In the example shown in the figure, the drive element is TAB (Tape Automated).
(refer to Japanese Patent Application Laid-Open No. 2-891), a driving element is directly fixed, is held on the back surface of the printed circuit board 21, and is connected thereto. If necessary, a driving circuit (not shown) such as a bias circuit or a control element is arranged in the vicinity. However, as the display capacity increases, the load fluctuation increases, so that the bias circuit easily generates heat. It is preferable to be disposed in a peripheral open area of the frame body.

Reference numeral 3 denotes a frame disposed on the back surface of the liquid crystal cell 1 on which the liquid crystal cell 1 and the driving element 2 are mounted. The frame 3 is formed of a resin molded product or the like.
Bosses 32 are provided corresponding to corners (notched portions in the cross projecting portions of the upper and lower substrates 11) S caused by the displacement of the substrate 11. The frame 3 is made of an ABS resin, a polycarbonate resin, or the like, and may be hard or soft. A bridge 33 is provided on one side of the frame body 3 to accommodate a heat-generating component or to provide an open area for accommodating a circuit requiring adjustment or a thicker component. A terminal 34 for receiving a power supply and a signal for driving the power supply is fixed. An embedding nut 321 made of brass or the like is press-fitted into the boss 32, and its outer shape is formed in 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. . Between the liquid crystal cell 1, the driving element 2, or the printed circuit board 21 and the frame 3, a sheet-like or rod-like cushioning material 51 made of silicon rubber, styrene resin, or the like may be interposed as necessary.

The frame 3 further houses illumination means 6 from the back. The illuminating means 6 includes 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 disposed on a side surface of the light guide plate 61, and the light guide plate 61 is fitted into the through hole 31. ing. Further, if necessary, a light diffusion sheet 62 may be laid on the surface of the light guide plate 61 and a reflection sheet may be attached to the back surface. It may be wound around the contact. The back surface of the frame 3 is closed by a back plate 7 made of a metal plate 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 side, and 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
Are the bosses 32 of the frame 3 in contact with the corners S of the liquid crystal cell 1.
It is fixed to the part with a screw 52. Thus, a so-called display portion is integrally held. The through-hole 41 is formed with a step portion 43 toward the inner surface by drawing or the like. The liquid crystal cell 1 or the liquid crystal cell 1 is formed directly at the step portion 43 or via a buffer material 53 at or near the step portion 43.
The connection between the drive element 2 and the frame 3 may be pressed.

[0012]

According to the present invention, as described above, the notched four corners of the substrate of the liquid crystal cell are supported by the bosses, so that even if the display surface becomes large, it is securely held without affecting the effective display surface. There is no possibility that the display center is displaced, the liquid crystal cell is moved after the assembly, and the driving elements and the like are not damaged, and the conduction failure of the connection portion does not occur.

Further, since the liquid crystal cell is stacked on the frame from the front side and the illuminating means is housed from the back side, each can be handled independently, and the workability of inspection, assembly, repair and the like of each can be improved. In addition, it is extremely unlikely that the wiring member is damaged or the liquid crystal cell is chipped. Furthermore, since the heat generating part (circuit or light source) can be arranged in the open area around the frame or can be housed so as to be released to the back of the frame, the heat is not accumulated inside the frame and the like, and the contrast change due to the temperature dependency of the liquid crystal cell. , And high display quality can be maintained.

[Brief description of the drawings]

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

FIG. 2 is a sectional view of a main part of 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

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Norio 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori Sanyo Electric Co., Ltd. (72) Inventor Masanobu Matsumura 3-201 Minamiyoshikata, Tottori City, Tottori Prefecture Tottori (56) References JP-A-63-282778 (JP, A) JP-A 1-155089 (JP, U) (58) Fields studied (Int. Cl. ⁷ , DB name) G02F 1 / 1333 G09F 9/00 350

Claims (1)

(57) [Claims] 1. A liquid crystal cell having a plurality of substrates adhered so as to be displaced from each other, and a boss which accommodates illumination means from the back and is provided corresponding to a corner generated by the displacement of the substrate of the liquid crystal cell. And a front frame fixed to a boss portion of the frame body covering at least a peripheral portion of the liquid crystal cell from a front surface side. .