JPH07261187A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To provide a liquid crystal display device improved in assembly workability by substantially preventing breaking or cutting of the ends of lugs of a frame enclosing the periphery of the image display part of a liquid crystal display element for fixing auxiliary members, such as printed circuit boards, to the rear of the liquid crystal display element at the time of overhaul, etc. CONSTITUTION:The lugs 2 projecting from the frame 1 enclosing the periphery of the image display surface of the liquid crystal display element beyond its rear surface are respectively provided with holes 3 in order to retain and fix the auxiliary members, such as printed circuit boards 5, to be arranged on the rear of the liquid crystal display element in the peripheries of the near surface. Convergent pins 4 are inserted into the respective holes from the outer side of the periphery and the peripheries of the rear surface of the auxiliary members are retained by the end sides of the pins past these holes to fix the auxiliary members to the rear surface of the liquid crystal display element.

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 an assembly workability which is convenient for disassembly and repair.

[0002]

2. Description of the Related Art Conventionally, a rear view is shown in FIG.
As shown in the side view in (b), in order to fix an attachment member such as the printed circuit board 5 behind the liquid crystal display element 6 of the liquid crystal display device, the attachment of the frame 1 surrounding the image display portion of the liquid crystal display element 6 A notch 7 is provided near the end of the claw 2 that protrudes to the rear side of the member, and the part from the notch 7 to the end of the claw 2 is bent as shown so as to press the periphery of the attached member, The members were fixed. Figure (b)
Inside, details such as the thickness of the material of the frame 1 itself are ignored.

[0003]

However, in the conventional structure as described above, when it becomes necessary to disassemble the liquid crystal display device, for example, when repairing is desired, the end of the claw of the frame once bent is reversed. Even if you try to bend it back to its original shape, it will be difficult to bend back because the material at the bend has hardened due to age hardening, etc., and sometimes it will break from the notch. Often, it was necessary to replace the entire frame. Also, the relationship between the thickness of the accessory and the position of the notch provided on the frame claw is delicate, and even if you bend upward from the notch, a slight gap remains between the bent part and the back of the accessory, causing play. There were also problems such as easy sticking.

It is an object of the present invention to provide a liquid crystal display device which does not cause the above problems and can be easily disassembled without damaging the frame during disassembly.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems, in the present invention, a liquid crystal display device is provided in order to fix an accessory member such as a printed circuit board arranged behind the liquid crystal display device by pressing around the rear surface thereof. The frame surrounding the periphery of the image display surface of the display element is provided with holes near the ends of the claws protruding beyond the back surface of the attachment member, and each of the holes is provided with a tapered pin from the outside of the periphery. The back surface of the accessory was pressed by the end of the pin that had been inserted and passed through the hole, so that the accessory was fixed. The pins used for that purpose should be made of wire rods, or bent metal plates should be bent to make them hollow so that the cross section of the pins elastically contracts and deforms relatively easily when the pins are inserted. Use the formed one. Further, a groove-like stepped portion is provided on the thick side where the cross section of the tapered pin is larger than the cross section of the claw hole, and the cross section of the pin there is slightly larger than the cross section of the claw hole.
At least the tapered side of the pin is sharply reduced so that the pin is prevented from coming off. Furthermore, the cross-sectional contour of the pin and the contour of the hole provided in the claw were formed in substantially the same quadrangle.

[0006]

With the above arrangement, there is no problem that the tip of the nail extending from the periphery of the frame to the rear side of the image display portion is broken during the disassembling work and the entire frame must be replaced. If the material of the frame is relatively strong and the pin is made of a material that is relatively soft and easily plastically deformed, when the pin material is a wire rod, the pin is pressed firmly into the hole of the frame's claw and the cross section of the pin The shape is deformed and fits well, making it difficult to pull out the pin. When the pin is manufactured by bending an elastic metal plate into a hollow shape, the cross-sectional shape is elastically deformed when the pin is pushed in, and it is easy to push the pin into the hole of the claw of the frame. However, in this case, it is safer to provide the pin with a groove-like step to prevent it from coming off.
When a metal plate material is used, the working operation for forming the step portion is easy. In the case of the present invention, if the side of the peripheral edge of the hole provided in the claw of the frame near the image display surface is located closer to the image display surface than the back surface of the accessory member to be fixed, the pin will not move. Even when there is a slight difference in the dimension of the member when it is inserted into the hole due to a difference in manufacturing lot, the attached member can be reliably pressed down by the pin. If the cross-sectional shape of the pin according to the present invention is a shape that can easily rotate with respect to the holes of the claws of the frame, it may be easy to come off. Therefore, both cross-sections are made into a substantially square shape. This is a triangle in the shape of a corner,
This is because even if there is a slight difference between the hole and the pin, it becomes difficult to use, and if a polygonal cross section of a square or more with such a small size is used, it becomes practically the same as a circle.

[0007]

FIG. 1 shows a first embodiment of the present invention, which is a liquid crystal display device 6
A printed circuit board 5 is arranged on the back surface of the frame, and in order to fix the printed circuit board 5, the tapered pin 4 is inserted into the end of the claw 2 extending to the rear side of the frame 1 surrounding the periphery of the image display surface. 3A and 3B are views showing a state in which a hole 3 for making a hole is provided, FIG. 6A is a rear view, and FIG. FIG. 2 is an enlarged perspective view of the vicinity of the square hole 3 at the end of the claw 2 of the frame 1 of the first embodiment and the square pyramidal pin 4 to be inserted into the hole 3 of the claw 2. The pin 4 is inserted in the direction of the arrow in the figure. In this embodiment, the frame is made of a steel plate, and the pin 4 is made of a relatively soft alloy containing copper or the like.

FIG. 3 is a view showing a hollow section of a pin 4a made of a metal plate used in the second embodiment of the present invention. As shown in the figure, the cross section is hollow so that it can be easily deformed. Therefore, it is not necessary for the four sides to be completely enclosed. Easy,
Moreover, there is no problem in use. In the case of this embodiment, the hole 3 of the claw 2 of the frame 1 is a substantially completely square hole, but the cross section of the pin 4a is just angular so that it does not rotate in the hole, and the corner portion is Can be fairly rounded. Further, when such a pin 4a whose cross-sectional shape is easily deformed is used, it is better to provide the pin with a grooved step portion 8 for preventing the pin from coming off. FIG. 4 is a side view showing an example of the shape of such a stepped portion, but it is not necessary to strictly manufacture such a shape, and the size of the stepped portion may be small. It's good if the pins are hard to come off.

[0009]

As described above, according to the present invention, it is possible to obtain a liquid crystal display device which can be easily disassembled and repaired and in which members such as a frame can be reused as they are.

[Brief description of drawings]

1A and 1B show a state in which a pin is not yet inserted in the first embodiment of the present invention, FIG. 1A is a rear view thereof, and FIG. 1B is a side view thereof.

FIG. 2 is an enlarged perspective view of the vicinity of a square hole at the end of the claw of the frame of the first embodiment and a square pyramidal pin to be inserted into the hole of the claw.

FIG. 3 is a view showing a hollow cross section of a pin 4a manufactured from a metal plate used in a second embodiment of the present invention.

FIG. 4 is a view showing a groove-like stepped portion 8 for preventing removal, which is provided on a pin 4a according to a second embodiment.

FIG. 5 is a conventional liquid crystal display device, in which a claw 2 of a frame 1 for fixing a printed circuit board 5 to a back surface of a liquid crystal display element 6 is provided.
It is a figure which shows the state which bent the part by the side of the end part from the notch 7 in, in which (a) is the rear view and (b) is a side view.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame, 2 ... Claw, 3 ... Hole provided near the edge part of a nail, 4, 4a ... Pin, 5 ... Printed circuit board, 6 ... Liquid crystal display element, 7 ... Notch, 8 ... Groove-like step part.

Claims (5)

[Claims] 1. A frame surrounding the periphery of an image display surface of a liquid crystal display element is pushed over and fixed to an attachment member such as a printed circuit board arranged behind the liquid crystal display element by pressing and fixing it around the rear surface thereof. Holes are provided near the ends of the protruding claws, and tapered pins are inserted into the holes from the outside of the periphery, and the edges of the pins that have passed through the holes hold the periphery of the back surface of the accessory member. The liquid crystal display device is characterized in that the accessory member is fixed to the back surface of the liquid crystal display element. 2. The liquid crystal display device according to claim 1, wherein a hollow pin formed by bending an elastic metal plate material is used. 3. A groove-like stepped portion is provided on the thick side of a portion where the cross section of the tapered pin is larger than the cross section of the claw hole, and the cross section of the pin there is slightly larger than the cross section of the claw hole. 2. The liquid crystal display device according to claim 1, wherein at least the tapered side of the pin is rapidly contracted so that the pin is prevented from coming off. 4. The edge of the hole provided in the claw of the frame near the image display surface is positioned closer to the image display surface than the back surface of the attachment member to be fixed. The described liquid crystal display device. 5. The liquid crystal display device according to claim 1, wherein the cross-sectional contour of the pin and the contour of the hole provided in the claw of the frame are formed in substantially the same quadrangle.