JP3063331B2 - 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, and more particularly to a liquid crystal display device in which a liquid crystal display element and a circuit board on which electronic components such as a driving circuit are mounted are sandwiched via an elastic material containing conductive rubber. The present invention relates to a liquid crystal display device having a metal frame provided with a frame claw for mechanically fixing the liquid crystal display at a predetermined relative position.

[0002]

2. Description of the Related Art A liquid crystal display device comprises, as basic components, a liquid crystal display element, a circuit board on which electronic components such as ICs for driving the liquid crystal display element are mounted, and a metal frame for fixing both. A polarizing plate, a phase difference plate or a backlight installed as required.

FIG. 9 is an exploded perspective view for explaining the structure of a liquid crystal display device according to the prior art, where 01 is a metal frame (hereinafter simply referred to as a frame), 02 is a flat portion, and 03 is partitioned by a flat portion 02. Window part, 04 is frame claw part, 0
6 is a circuit board, 07 is a liquid crystal display element, 08 is a slit,
Reference numeral 09 denotes a terminal portion of the liquid crystal display element 07, and reference numeral 010 denotes a conductive elastic material (so-called zebra rubber or the like). These configurations are:
JP-A-62-210493, JP-A-63-688
No. 17, JP-A-63-128316,
2-85880, and Japanese Utility Model Application No. 59-189843.
Microfilm, My No. 60-201448
Black film, microfigure of Japanese Utility Model Application No. 63-21298.
Film, etc.

FIG. 10 is a partial side view for explaining another example of the structure of the frame claw provided on the frame, and FIG. 11 is a partial side view for explaining another example of the structure of the frame claw provided on the frame. 052 is a fixed nail. In the figures, the liquid crystal display element 07 and the circuit board 06 are made of a conductive elastic material 0.
10 and the frame claws 0 of the frame 01
4 is inserted into the slit 08 of the circuit board 06 and assembled. Note that an elastic material (not shown) is inserted between the liquid crystal display element 07 and the circuit board 06 as necessary.

In this state, the frame 01 and the circuit board 06
A pressure is applied between them, and the conductive elastic material 010 is compressed to make an electrical connection between the terminal portion 09 of the liquid crystal display element 07 and the terminal portion of the circuit board 06. The fixing claws 051 and 052 (FIG. 10) or the fixing claws 053 (FIG. 11) of 04 are bent around an axis perpendicular to the surface of the circuit board 06. As a result, the liquid crystal display element 07, the circuit board 06, and the frame 01 are integrally fixed.

FIG. 12 is a partially cutaway perspective view illustrating an example of the structure of a conductive elastic material, where 10 is a conductive elastic material, and 10-1, 10-2, and 10-3 are insulating materials. A certain rubber 10-4 is a conductor embedded in the rubber 10-3.
The conductor 10-4 is made of particles of a conductive substance such as graphite or a flexible conductive material.

The conductive elastic material 10 has a function of electrically connecting the terminals of the liquid crystal display element by laminating the terminals in the direction A and the terminals of the circuit board in the direction B as shown in FIG. Have. As described above, when the liquid crystal display element is assembled as a module, the terminals of the liquid crystal display element and the terminals of the circuit board are electrically connected between the liquid crystal display element, which is a main component of the liquid crystal display device, and the circuit board. An elastic material including a conductive elastic material to be inserted is interposed, and the relative position of each component is mechanically held and fixed between the metal frame and the circuit board by utilizing the elasticity of the elastic material. However, it is generally used as a structure that is inexpensive and excellent in mass productivity.

[0008]

However, in the liquid crystal display device having the above-mentioned conventional structure, the liquid crystal display element and the circuit board are compressed by an elastic material interposed therebetween to form a frame claw having a fixed claw. The fixing claw portion is deformed in the opposite direction to the compression direction by the repulsive stress of the elastic material (hereinafter, referred to as outward deformation) due to the metal frame having the metal frame and the circuit. There has been a problem that the thickness of the entire liquid crystal display device changes greatly beyond a predetermined size range of the substrate.

[0009] In recent years, in some devices used by mounting a liquid crystal display device, the thickness space allowed for mounting the liquid crystal display device has become smaller for the purpose of reducing the weight and thickness of the device. There is a demand for further reduction in the thickness of the display device. In order to respond to such demands, the components constituting the liquid crystal display device have been reduced in thickness, and especially the electronic circuit components mounted on the circuit board by means such as soldering have been reduced in thickness. I have.

In order to reduce the thickness of the liquid crystal display device, in the liquid crystal display device having the above-mentioned structure in which thin electronic circuit components are mounted, the height of the metal frame including the width in the thickness direction of the frame claw portion having the fixed claw is provided. Becomes the total thickness of the liquid crystal display device, so that the outward deformation of the fixed claw hinders the thinning of the liquid crystal display device. As a method for preventing the deformation of the fixing claws, there is also a means for increasing the strength by increasing the thickness of the metal frame. However, this not only increases the weight of the liquid crystal display device but also increases the fixing work for bending the fixing claws. Workability is reduced.

An object of the present invention is to eliminate the disadvantages of the liquid crystal display device having the conventional structure and to prevent the liquid crystal display device from increasing in thickness without increasing the thickness and strength of the metal frame material used. Is to provide.

[0012]

In order to achieve the above object, the present invention provides a liquid crystal display element, a circuit board, an elastic member, and a member surrounding the above-mentioned members together with the circuit substrate to reduce the elasticity of the elastic member. In a liquid crystal display device provided with a metal frame for mechanically fixing a relative position of each member by utilizing, a circuit board provided at an end of the frame so as to extend from the liquid crystal display element side beyond the circuit board. The fixing claw that bends and fixes it by pressing it from the outside so that the amount of outward deformation of the fixing claw does not exceed the maximum thickness allowed for the liquid crystal display device even if the fixing claw is deformed outward due to the repulsive stress of the elastic material. It is characterized by having.

That is, the present invention provides a liquid crystal display device, a circuit board on which electronic components such as a drive circuit are mounted, and a liquid crystal display device and the circuit board which are sandwiched by an elastic material containing conductive rubber. And a metal frame 1 for mechanically fixing the metal frame at a predetermined relative position. The metal frame 1 is bent at an edge of the metal frame 1 around an axis projecting toward the circuit board and perpendicular to the surface of the circuit board. A frame claw portion 4 having a possible fixed claw 5;
Wherein the width in the protruding direction decreases in the direction of the circuit board as the distance from the axis increases.

[0014]

The width w ₁ of the tip of the fixed claw 5 is adjusted by the amount corresponding to the amount of outward deformation after the nail is fixed due to the repulsive stress of the elastic material, or by an amount larger than that, ie, the frame claw. smaller than the thickness width w ₂ parts 4, by which the shape gradually reduced to the circuit board surface direction toward the tip portion from the base portion, the fixing claws 5 by the repulsive stress of the elastic member after the pawl fixed Even when deformed outward, the total height of the metal frame (that is, the thickness of the entire liquid crystal display device) does not change.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the liquid crystal display device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partial side view for explaining a main structure of a metal frame in a first embodiment of a liquid crystal display device according to the present invention, wherein 1 is a frame, 4 is a frame claw, and 5 is a fixed claw.

As shown in FIG. 1, the frame 1 is provided with a frame claw 4 protruding in the direction of the circuit board to be fixed, and is parallel to the surface of the circuit board at the lowermost end of the liquid crystal display device from the frame claw 4. Fixed claw 5 in various directions. The fixing claw 5 has a shape extending in a direction parallel to the circuit board surface from an end of the frame claw 4, and has a width gradually increasing from the base of the frame claw 4 toward the extending end in the circuit board direction. is shaped as a narrow, width w ₁ of the circuit board surface of the extending end direction parallel width w ₂ in a direction parallel to the circuit board surface of the base portion at w ₁ <w _2, and w ₂ - w ₁ is that as comprising an amount and with the same or lower to outward deformation due to the stress of the elastic member including the conductive elastic material.

FIG. 2 is a cross-sectional view taken along line AA of FIG. 1. The metal frame 1 is a flat portion 2 for fixing a peripheral portion of the upper surface of the liquid crystal display element and a display pattern of the liquid crystal display element is visually observed. And a plurality of frame claws 4 and a fixed claw 5. The frame claw 4 has a fixed claw 5 extending in a direction parallel to the surface of the liquid crystal display element and the circuit board, and this fixed claw 5 is flush with the frame claw 4 before being inserted into the slit of the circuit board. It is in.

FIG. 3 is a sectional view showing a first embodiment of the liquid crystal display device according to the present invention, wherein the same reference numerals as those in FIGS. 1 and 2 correspond to the same portions, 6 is a circuit board, and 7 is a liquid crystal display element. ,
9 is a terminal portion of the liquid crystal display element, 10 is a conductive elastic material, 11
Denotes an elastic material, and 12 denotes an electronic circuit component such as an IC. In the figure, a metal frame 1 surrounds a laminated member of a liquid crystal display element 7 and a circuit board 6 (components such as a backlight are not shown), and the frame claws 4 pass through slits of the circuit board 6. The state where the fixing claw 5 is bent is shown.

When the fixing claw 5 is bent, the laminated structure of the above members is compressed, and the conductive elastic material 10 and the elastic material 11 are compressed.
, And the fixed claw 5 is rotated on the surface of the circuit board 6 around an axis perpendicular to the surface of the outer circuit board. When the fixed claw 5 is bent to reach the state shown in the figure, the dimensions of the fixed claw 5 are set so that the thickness of the liquid crystal display device becomes a predetermined thickness.

FIG. 4 is a partial explanatory view of the back surface as viewed in the direction of the line BB in FIG. 3, wherein 6 is a circuit board, 12 is an electronic circuit component, and the fixing claw 5 is connected to the frame claw 4 through the circuit board 6 Shows a state in which it is bent around an axis perpendicular to the plane. Thus, the circuit board 6 holds the components such as the liquid crystal display element together with the frame at a predetermined thickness. FIG. 5 is the arrow C in FIG.
FIG. 4 is a partial side view as viewed from the direction, and illustrates the engagement and fixation of the frame claw portion 4 and the circuit board 6 and the effect obtained by this fixing means.

As shown in FIG. 1, the fixed claw 5 bent on the circuit board surface is formed of the conductive elastic material 10 or the elastic material 11 compressed and held between the liquid crystal display element and the circuit board. Due to the repulsive stress, it bends as shown by a dashed line 5 ', causing outward deformation. However, since the width of the fixing claw 5 in the protruding direction decreases in the direction of the circuit board 6 toward the extending direction, the total thickness of the liquid crystal display device set by the height h of the metal frame 1 is set. The dimensions do not change.

FIG. 6 is a partial side view for explaining the main structure of a metal frame in a second embodiment of the liquid crystal display device according to the present invention.
52 are provided on both sides of the frame claw portion 4. The shapes and dimensions of the fixed claws 51 and 52 are the same as those of the first embodiment, and the same effects as those of the first embodiment can be obtained by this embodiment.

FIG. 7 is a partial side view for explaining the main structure of a metal frame in a liquid crystal display device according to a third embodiment of the present invention. By providing a notch 55 near the tip of, it is made to be bendable. The dimensions are the same as those of the first and second embodiments. According to this embodiment, the same effects as those of the above embodiments can be obtained, and there is also an effect that the press forming of the metal frame is simple.

FIG. 8 is an exploded perspective view for explaining a detailed structural example of the liquid crystal display device according to the present invention, wherein the same reference numerals as those in the above-mentioned embodiments correspond to the same parts, and reference numeral 20 denotes a backlight (cold cathode). Tube, 21 is a lamp reflection sheet, 22 is a reflection sheet, 23 is a light diffusion sheet, 24 is a light guide plate, 25 is a heat seal, 26 is a spacer, 27 is a lamp cover, 2
Reference numeral 8 denotes a mounting means such as a rivet or a screw, 29 denotes a power supply cable to the backlight, and 30, 31, and 32 denote external connectors.

As shown in the figure, the liquid crystal display device according to the present invention comprises a liquid crystal display element 7, a circuit board 6, a reflection sheet 2
2. The light diffusion sheet 23, the light guide plate 24, and other constituent members are laminated, and the frame 1 and the circuit board 6 are integrally fixed. After compressing the conductive elastic member 10 or the spacer 26 and other interposed elastic members (not shown) to fix the constituent members, the fixing claws of the frame claw portion 4 are moved in the stacking direction of the constituent members by the repulsive stress of the various elastic members. The outward deformation does not increase the total thickness of the liquid crystal display device.

[0026]

As described above, according to the present invention,
The width of the distal end portion of the fixed claw formed on the frame claw portion of the metal frame is adjusted by the amount corresponding to the amount of outward deformation after the claw is fixed by the repulsive stress of the elastic material, or the base portion of the fixed claw, that is, by an amount larger than that. By making the shape smaller than the width in the thickness direction of the frame claw portion and gradually decreasing in the circuit board surface direction from the base portion toward the tip portion, the fixed claw is outward due to the repulsive stress of the elastic material after the claw is fixed. Even if deformed, the total height of the metal frame (that is, the thickness of the entire liquid crystal display device) does not change. Therefore, it is possible to maintain a predetermined total thickness without particularly increasing the thickness of the metal frame to have a high strength, to easily obtain a low-cost, high-mass productivity, and thinner liquid crystal display device. Can be.

[Brief description of the drawings]

FIG. 1 is a partial side view illustrating a main part structure of a metal frame in a first embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1 illustrating a main structure of a metal frame in the first embodiment of the liquid crystal display device according to the present invention.

FIG. 3 is a sectional view showing a first embodiment of the liquid crystal display device according to the present invention.

FIG. 4 is a partial explanatory view of the back surface of the liquid crystal display device according to the first embodiment of the present invention, viewed from the direction of line BB in FIG. 3;

FIG. 5 is a partial side view showing the first embodiment of the liquid crystal display device according to the present invention, as viewed from the direction of arrow C in FIG. 4;

FIG. 6 is a partial side view illustrating a main structure of a metal frame in a second embodiment of the liquid crystal display device according to the present invention.

FIG. 7 is a partial side view illustrating a main structure of a metal frame in a third embodiment of the liquid crystal display device according to the present invention.

FIG. 8 is an exploded perspective view illustrating a detailed structure example of the liquid crystal display device according to the present invention.

FIG. 9 is an exploded perspective view illustrating the structure of a conventional liquid crystal display device.

FIG. 10 is a partial side view illustrating a configuration example of a frame claw portion provided on a frame.

FIG. 11 is a partial side view illustrating another configuration example of the frame claw portion provided on the frame.

FIG. 12 is a partially broken perspective view illustrating a structural example of a conductive elastic material that electrically connects a liquid crystal display element and a circuit board.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 metal frame 2 flat portion of frame 3 window portion 4 frame claw portion 5 fixing claw 6 circuit board 7 liquid crystal display element 8 slit 9 terminal portion 10 conductive elastic material 11 elastic material 12 circuit component

Continuing from the front page (72) Inventor Toshihiko Yabuuchi 3300 Hayano Mobara-shi, Chiba Pref. U) Shokai 55-125618 (JP, U) Shokai 61-162890 (JP, U) Shokai 60-145417 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) G02F 1/1333 G02F 1/1345 G09F 9/00 349

Claims (1)

(57) [Claims] 1. A liquid crystal display element, a circuit board on which at least electronic components of a driving circuit are mounted, and a liquid crystal display element and the circuit board are held in a predetermined relative position by being sandwiched via an elastic material containing conductive rubber. A metal frame mechanically fixed at a position, wherein the metal frame is bent at an edge of the metal frame around an axis perpendicular to the surface of the circuit board while projecting toward the circuit board. A frame claw portion having a fixing claw, wherein a width W1 of a tip portion of the fixing claw is smaller than a width W2 of a base portion of the fixing claw, and in a direction of the circuit board as the distance from the axis increases. A liquid crystal display device having a reduced shape, wherein W2-W1 is equal to or less than an amount of outward deformation due to stress of an elastic material including the conductive elastic material.