JPS5917579A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a liquid crystal display device that is easier to assemble.

The display device C (hereinafter referred to as module), which is integrated with the board on which all the liquid crystal panel drive circuits are mounted, inputs power and other simple signals from the outside, and displays the clock, numbers, and characters. It is used for alphanumeric (hereinafter abbreviated as αN) display. The present invention relates to a liquid crystal display device in which assembly ease is improved in such a module.

Conventionally, as shown in FIG. 3, in such a module, the liquid crystal panel 11 is placed in a plastic frame 12 molded in advance so that the liquid crystal panel 11 can fit therein, and the conductive rubber 13 is inserted between the liquid crystal panel 11 and the drive circuit board 14. Insert it into board 1
One through the holes 14-A'e made on the 4-
A screw 15 was inserted from below 4 to secure the spring Jvll. In the conventional liquid crystal display device, (1) the plastic frame 12 is fixed with the screws 15, which requires a large number of assembly steps.

(2) The plastic frame 12 is currently molded in a shape that allows the liquid crystal panel 11 to fit perfectly in a predetermined position, and making such a plastic frame using a lathe would require a very large number of man-hours; Also, the mold costs are high, making it unsuitable for small-lot production.

(3) In order to fix the plastic frame 12 with the screws 15, it is necessary that holes slightly smaller in diameter than the diameter of the screws 15 and equal in number to the number of screws 15 must be drilled in advance at predetermined positions in the plastic frame 12. Since the screw 15 advances from the groove of the screw into the hole of the plastic frame 12 from the notch, the plastic frame 12 with the screw hole carved cannot be reused.

(The plastic frame 12 needs to be made of a material that is soft enough to allow the screw 15 to carve a screw hole.Due to the following reasons: Assembling accuracy is achieved!/! :(
stomach.

(5) The plastic frame 12 is easily deformed by heat, and even if it is once fixed with screws, it is likely to loosen due to changes in temperature, resulting in poor conduction.

There were drawbacks such as.

The liquid crystal display device of the present invention eliminates such drawbacks, and its purpose is to provide a liquid crystal display device that is easy to assemble.

Another object of the present invention is to provide a highly reliable liquid crystal display device.

Another object of the present invention is to provide a liquid crystal display device that is inexpensive even for small-lot production.

In the liquid crystal display device of the present invention, a thin metal plate is used as a holding frame for fixing the liquid crystal panel, legs are provided on the metal plate, and the metal plate is inserted into a hole provided in a drive circuit board, and the liquid crystal panel, drive circuit board, and holding frame are connected to each other. This is done by aligning the holes drilled in the holding frame and the drive circuit board, and then fixing is performed by twisting the legs of the holding frame four times.

FIG. 1 is a developed view of a first embodiment of the liquid crystal display device of the present invention. The liquid crystal display device of the present invention comprises at least a holding frame 2, a liquid crystal panel 1, a conductive rubber 3, and a circuit board 4 on which drive circuit elements 6 such as LSI, capacitors, and resistors are mounted. The presser frame 2 is a thin metal plate with a thickness of 0.1
It is about 1°21111++. Materials include iron, copper, bronze, stainless steel, and lumi plates. The thin metal plate has a constant thickness and may be a rolled metal material.

Iron material is the cheapest. When using iron materials, forming a base with nickel etc. will make them more resistant to rust. Furthermore, when a stainless steel plate is used, it is resistant to rust and has excellent rolling properties. The presser frame 2 is made by bending a single thin metal plate into the shape shown in FIG. As shown in the drawing, the four sides of the presser frame 2 are bent at approximately right angles so as to surround the liquid crystal panel 1. Two feet for fixing the presser frame 2 itself and the liquid crystal panel 1 to the circuit board 4 protrude from predetermined portions.

5- The liquid crystal panel 1 shown in FIG. 1 is an example of a twisted nematic type C (hereinafter abbreviated as TN type) liquid crystal panel.

When the liquid crystal towel 1 is of the TN type, the upper and lower polarizing plates and the reflecting plate are fixed to the panel with a silicone-based or acrylic-based adhesive. When the liquid crystal panel 1 is a White-Taylor guest-host type (hereinafter abbreviated as GH type), a UV filter is attached to the upper surface of the liquid crystal panel 1, and a reflection plate is attached to the lower surface.

The conductive rubber 3 is placed under the terminal portion of the liquid crystal panel 1. Usually, the main material is silicone resin, and conductive members mixed with graphite or silver powder are placed at predetermined positions.

As the circuit board 4, a glass evo board, a paper epoxy board, a paper phenol board, an aa4 board (manufactured by Hitachi Chemical), or the like is used. The circuit board 4 must have a certain degree of hardness, and a soft material such as a flexible board is not suitable. On the upper or lower surface of the circuit board 4, driving elements such as an LSI 6 are arranged to drive the liquid crystal panel 1 and perform display. TJ8
A flat package is effective for downsizing the entire liquid crystal display device. When the LSI 6 is attached to the top surface of the circuit board 4, there is an advantage that the circuit board can be manufactured as a single-sided board by devising the wiring on the circuit board 4. LEI Engineering (
By attaching it to the bottom surface of the 3i circuit board 4, when attaching the liquid crystal panel 1 to the circuit board 4, the reflector affixed to the bottom surface of the panel 1 will not come into contact with the LSI 6 and be damaged (easy to assemble.Other TJS There is also a method of drilling a hole in the part where the circuit board 4 is placed and embedding the LSI 6 therein.This has the advantage of making the entire liquid crystal display device thinner and smaller.On the circuit board 4, the liquid crystal panel 1 is placed. A terminal section is provided for transmitting signals to the terminal section, and a conductive rubber 3 is arranged on the terminal section.The terminal section provided at the end of the circuit board 4 inputs and outputs signals to and from the outside.On the circuit board 4 A hole 4A is drilled in a part of the presser frame 2 that accommodates the feet of two people.The shape of the hole 4 is rectangular or oval, and the foot is made so that the feet of the two people of the presser frame 2 can fit into the hole 4A. 2A.The upper part of the circuit board 4 has a hole 4B provided for positioning the liquid crystal panel 1.The shape of the hole 4B is circular, oval, or rectangular. , square, etc. A hole 2B is also formed on the presser frame 2 at a portion corresponding to the hole 4B for positioning the liquid crystal panel 1 on the circuit board 6.

The liquid crystal display device of the present invention, which is composed of at least the above-mentioned parts, is assembled by the following mechanical method. The assembly jig 7 shown in FIG. 2 is a jig used when assembling the liquid crystal display device of the present invention. A bottle 7B is erected on the assembly jig 7. The position where bottle 7B is placed is presser frame 2.
This is the position of hole 2B. The presser frame 2 is placed upside down on this assembly jig 7. The presser frame 2 is placed on the assembly jig 7 by passing the hole 2B through the bottle 7B. Next, the liquid crystal panel 1 is placed on the presser frame 2 placed on the assembly jig 7 so that the outer periphery is in contact with the bin 7B. In this embodiment, two bottles 7B are placed on one side of the liquid crystal panel 101, and one bottle 7B is placed on a side perpendicular to the above-mentioned side. Therefore, if the outer circumference of the liquid crystal panel 1 is placed on the three bins 7B, the position of the liquid crystal panel 1 will inevitably be determined by the bins 7B. Next, conductive rubber 3 is placed on the terminals of liquid crystal panel 1. Next, the drive circuit board 4 is placed. A through hole 4B is pre-drilled on the circuit board 4 at a location corresponding to the position of the pin hole of the assembly jig 7. The circuit board 4 is set on the liquid crystal panel 1 by passing the hole 4B drilled in the board 4 through the bottle 7B of the assembly jig 7. The turtle 2A of the presser frame 2 is projected through the hole 4A of the substrate 4. Next, two people twist the legs of the presser frame 2 protruding from the circuit board 4 to fix the liquid crystal panel 1 to the circuit board 4.

In addition, when the conductive rubber 3 is attached to the liquid crystal panel 1 with an adhesive or adhesive on its side, the conductive rubber 3 becomes one with the liquid crystal panel 1, and the position of the conductive rubber 3 does not shift, so it is easy to assemble. It has the advantage of being very easy to bottle. The adhesive is
For example, there is a known acrylic adhesive used for pasting polarizing plates and reflective plates on the liquid crystal panel 1. Examples of adhesives include Cemedine KK's polyurethane adhesive product number 700 and epoxy resin adhesive product number 1500. These adhesives and adhesives are
Since the coating is applied not to the surface of the conductive rubber 3 where the conductive portion is exposed, but to the side surface that does not have the conductive portion, the conductivity is not impaired.

Furthermore, the assembly jig 7 shown in FIG. 2 is an example of the assembly jig used when assembling the liquid crystal display device of the present invention.
It is sufficient if B is in a predetermined positional relationship.

By doing so, (1) the relative positions of the liquid crystal panel 1 and the circuit board 4 are maintained in a fixed position by the bin 7B of the assembly jig 7, which facilitates assembly and has the advantage of reducing the number of assembly steps. Because there is no need to assemble the terminals of the liquid crystal panel 1 and the terminals of the circuit board 4, assembly is very easy and can be easily automated. Since the leg 2A of the frame 2 is fixed by twisting, the number of assembly steps is reduced.

(3) Since the presser frame 2 is made of a metal plate instead of plastic, there is no need to make a mold by injection molding, and it is suitable not only for mass production but also for small lot production, and is easy to manufacture and uses materials. The cost is also low.

(4) Since the holding frame 2 is made of metal, the assembled module is stable against environmental changes such as temperature changes and humidity changes, and is highly reliable.

There are other effects.

As described above, the liquid crystal display device of the present invention is easy to assemble, has high reliability, and will greatly contribute to the development of industry.

[Brief explanation of drawings]

FIG. 1 is an exploded view of a liquid crystal display device according to the present invention. FIG. 2 is an assembly jig for a liquid crystal display device according to the present invention. FIG. 13 is conductive rubber 11- 4.14 is circuit board or above Applicant Shinshu Seiki Co., Ltd. agent Patent attorney Muichi Mogami! Figure 1 Figure 2

Claims (2)

[Claims] (1) A liquid crystal display device comprising at least a liquid crystal panel, a driving element for driving the liquid crystal panel, a circuit board on which the driving element is mounted, and a holding frame for fixing the liquid crystal panel to the circuit board. The holding frame is made of a processed metal plate, and a through hole is made in the holding frame and the circuit board, and a pin is passed through the fireproof hole to connect the holding frame, the liquid crystal puffle, and the circuit board. A liquid crystal display device, characterized in that the liquid crystal panel is fixed to the circuit board by aligning their positions, and then twisting the portion of the holding frame that protrudes through the hole drilled in the circuit board. (2) Conductive rubber is used as an electrical connection member between the liquid crystal panel and the circuit board, and the conductive rubber is bonded to the adhesive or adhesive using the side surface that does not have a conductive part. A liquid crystal display device according to claim 1, characterized in that the liquid crystal display device is fixed to a liquid crystal panel and uses such a liquid crystal panel.