JPH04361227A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To easily and surely mount a gold frame to a printed circuit board without impairing the mechanical strength of a leg piece and to form the device to a smaller size and higher density by expanding the long hole of the printed circuit board at the point where the shaft part of the leg piece of the gold frame is liable to be hooked and forming the parts exclusive of this point to a narrow width. CONSTITUTION:The leg piece 10 is inserted into the long hole 11 allowing for the clearance in the short size w of the leg piece at the time of mounting the gold frame 8 fitted with a liquid crystal display element (LC) 1 by exposing the LCD 1 into an aperture 9a. The stem part 10a of the leg piece 10 inserted therein can be twisted at the expanded point of the long hole allowing for the clearance in the inside diameter d and there is no possibility that the stem part 10a is hooked to the inside wall of the long hole 11. Then, the detaining part 10b of the leg piece 10 is surely detained to the rear part of the substrate 6 and the gold frame 9 is mounted easily and surely to the printed circuit board 6 without generating a mounting failure.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a method of positioning and positioning a liquid crystal display element (hereinafter abbreviated as "LCD") by inserting the legs of a metal frame into elongated holes of a printed circuit board and caulking them.
The present invention relates to a fixed liquid crystal display device.

0002

2. Description of the Related Art FIG. 4 is an exploded perspective view for explaining a conventional example of this type of liquid crystal display device. In the same figure, the LCD generally indicated by the reference numeral 1 has a liquid crystal sealed between an upper glass substrate 2 and a lower glass substrate 3, which is slightly smaller than the upper glass substrate 2.
This is a known type in which polarizing plates 4 and 5 are attached to the surfaces of both glass substrates 2 and 3, respectively, and the terminal portion 2a of the upper glass substrate 2
A group of electrode terminals (not shown) for external connection is formed on the wafer. Further, a printed circuit board generally indicated by reference numeral 6 is provided with a circuit (not shown) for driving the LCD 1, and its connection terminals 7 are formed at equal pitches to the electrode terminal groups. Therefore, when the rectangular parallelepiped-shaped rubber connector 8 is interposed between the terminal portion 2a of the upper glass substrate 2 and the printed circuit board 6 and compressed, the electrode terminal group of the terminal portion 2a and the connecting terminal group 7 of the printed circuit board 6 are compressed by rubber. Electrical connection is established via the connector 8. The rubber connector 8 is a laminate in which insulating layers and conductive layers are alternately laminated along the longitudinal direction by using rubber such as silicone rubber as a base material and mixing conductive powder such as carbon into a part of the base material. This is a well-known structure in which conduction can be achieved at the pressurized portion of the conductive layer.

[0003] The gold frame generally indicated by reference numeral 9 is the LCD1
The LCD has an opening 9a for exposing the display surface of the LCD.
At the same time, the leg pieces 10 protruding at a plurality of locations are inserted into the elongated holes 11 of the printed circuit board 6 and crimped to be fixed to the printed circuit board 6. Then, the rubber connector 8 is compressed by this caulking, and the L
The CD 1 is positioned and fixed above the printed circuit board 6. Note that the leg piece 10 has a narrow shaft portion 10.
It is formed in an inverted T-shape with a wide locking part 10b at the tip of the leg 10, and by twisting the shaft part 10a of the leg piece 10 inserted into the elongated hole 11, the locking part 10b can be attached to the back surface of the printed circuit board 6. This metal frame 9 can be attached to the printed circuit board 6 very easily and reliably.

0004

By the way, in recent years, in order to promote the miniaturization and high density of this type of liquid crystal display device, there has been a trend to make the elongated hole 11 of the printed circuit board 6 as small as possible. As shown in , the short dimension of the long hole 11 w
If sufficient clearance is not allowed for the shaft portion 10 of the leg piece 10 when attaching the metal frame 9 to the printed circuit board 6.
a easily gets caught on the inner wall of the elongated hole 11, so the original engagement relationship of locking the locking part 10b to the printed circuit board 6 is not achieved, that is, the locking part 10b is not attached to the back surface of the printed circuit board 6. There was a risk that the installation of the metal frame 9 would be completed while the metal frame 9 remained separated. As a result, the rubber connector 8 is excessively compressed, making it impossible to conduct accurate conduction, and a liquid crystal display device is assembled with the display surface of the LCD 1 tilted, resulting in the occurrence of defective products. In other words, in order to avoid the occurrence of defective liquid crystal display devices due to improper installation of the metal frame 9, it has conventionally been necessary to allow sufficient clearance for the short dimension w of the elongated hole 11. In that case, the wide elongated hole 11 becomes a factor that hinders the miniaturization and high density of the liquid crystal display device.

[0005] In order to make the elongated hole 11 narrower, the shaft portion 1 is
Although it is possible to set the width dimension W of 0a small,
In that case, the mechanical strength of the leg piece 10 decreases and the reliability is impaired, so this is not a preferable method.

[0006] The present invention was made in view of the above circumstances, and its purpose is to easily and reliably attach the metal frame to the printed circuit board without impairing the mechanical strength of the leg pieces, and to have a compact and compact structure. An object of the present invention is to provide a liquid crystal display device that can promote high density.

[0007]

[Means for Solving the Problems] An object of the present invention is to provide an LCD, a printed circuit board having a circuit for driving the LCD and having an elongated hole, and the printed circuit board and the L
A rubber connector that is interposed between the CD and the connector to conduct the two, and an inverted T with a wide locking part at the tip of the narrow shaft part.
A liquid crystal display comprising a metal frame with projecting leg-shaped legs to support the LCD, and the locking portion is locked to the printed circuit board by twisting the shaft portion of the leg inserted into the elongated hole. In the display device, this is achieved by widening the transverse dimension of the central portion in the longitudinal direction of the elongated hole compared to other portions, and arranging the shaft portion of the leg at the widened portion.

[0008]

[Operation] According to the above means, since the elongated hole is widened at the location where the shaft portion of the leg piece is likely to be caught, the leg piece can reliably lock the locking portion to the printed circuit board. Inadequate attachment of the metal frame can be avoided, and since the elongated hole can be formed to be extremely narrow except for the widened portion, the space factor can be improved.

[0009]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of a liquid crystal display device according to the present invention, and FIG. 2 is a plan view of essential parts showing an elongated hole and a leg piece in a locked state in the liquid crystal display device. The same reference numerals are given to the parts corresponding to those in FIGS. 4 and 5 described in .

The liquid crystal display device shown in FIGS. 1 and 2 is characterized by the shape of the elongated hole 11 formed in the printed circuit board 6 for inserting the leg piece 10 of the metal frame 9. In other words, this long hole 11
is provided with a pair of substantially semicircular escape notches 11a facing each other in the transverse direction in the longitudinal center thereof, and the inner diameter d of the widened portion of the elongated hole 11 including these relief notches 11a is the same as that of the leg piece 10. It is set to a value obtained by adding a clearance to the width dimension W of the shaft portion 10a. Further, the short dimension w of the elongated hole 11 excluding the relief notch 11a is set to a value that is much smaller than the width dimension W of the shaft portion 10a but sufficiently larger than the plate thickness dimension T.

Therefore, the LCD 1 is exposed in the opening 9a, and the metal frame 9 in which the LCD 1 is fitted is attached to the printed circuit board 6.
When installing the leg piece 10 into the elongated hole 11, which has an expected clearance on the short side dimension w, the shaft part 10a of the inserted leg piece 10 can be easily inserted into the elongated hole 11, which has an expected clearance on the inner diameter d. The shaft portion 10a can be easily twisted at the widened portion of the elongated hole 11, and there is no fear that the shaft portion 10a will get caught on the inner wall of the elongated hole 11. Therefore, the locking portions 10b of the leg pieces 10 can be reliably locked to the back surface of the printed circuit board 6, and the metal frame 9 can be easily and reliably attached to the printed circuit board 6 without causing any installation defects. Further, since the elongated hole 11 is formed to be significantly narrower than the conventional product except for the widened portion, the area occupied by the elongated hole 11 on the printed circuit board 6 is reduced, and the space factor can be improved. Moreover, the shaft portion 1 of the normal width dimension W is located at the widened part of the elongated hole 11.
Since the leg piece 0a can be inserted and twisted, the mechanical strength of the leg piece 10 is not sacrificed.

[0013] The structure of the parts not particularly explained in the above embodiment is the same as that of the conventional example, and in the figure, reference numeral 2 is an upper glass substrate, 2a is a terminal portion, 3 is a lower glass substrate, and 4 and 5 are polarizing plates. , 7 indicates a connection terminal, and 8 indicates a rubber connector, respectively.

FIG. 3 is a plan view of a main part showing an elongated hole and a leg piece in a locked state in another embodiment of the present invention. In this embodiment, a pair of substantially fan-shaped relief notches 11b are provided at point-symmetrical positions in the longitudinal center of the elongated hole 11, and the widened portion of the elongated hole 11 including these relief notches 11b is Leg piece 1
The size is set to the minimum size that does not cause any trouble in twisting the shaft portion 10a of 0. Therefore, the space factor is further improved compared to the above embodiment, and the size and size of the liquid crystal display device can be improved.
This is extremely effective in achieving high density. However, the above embodiment is superior in terms of ease of molding the printed circuit board 6.

[0015]

As explained above, in the liquid crystal display device according to the present invention, the elongated holes of the printed circuit board are widened at locations where the shafts of the legs of the metal frame are likely to get caught, and the elongated holes of the elongated holes are widened at locations other than the widened locations of the elongated holes. Since the width of the frame is narrow, it is possible to avoid installation defects such as the shafts of the legs being locked, and the metal frame can be easily and reliably attached to the printed circuit board. The space factor can be improved by reducing the area occupied by the elongated hole, and there is no need to reduce the width of the shaft portion of the leg, resulting in significant effects such as no loss of mechanical strength.

[Brief explanation of the drawing]

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

FIG. 2 is a plan view of a main part of the liquid crystal display device showing an elongated hole and a leg piece in a locked state.

FIG. 3 is a plan view of a main part showing an elongated hole and a leg piece in a locked state in another embodiment of a liquid crystal display device according to the present invention.

FIG. 4 is an exploded perspective view for explaining a conventional example.

FIG. 5 is a plan view of main parts for explaining problems of the prior art.

[Explanation of symbols]

1 LCD (liquid crystal display element) 6 Printed circuit board 9 Gold frame 10 Leg piece 10a Shaft part 10b Locking part 11 Long hole 11a, 11b Relief notch

Claims (1)

[Claims] 1. A liquid crystal display element, a printed circuit board having an elongated hole and a circuit for driving the liquid crystal display element, and a circuit board interposed between the printed circuit board and the liquid crystal display element, and a circuit board for driving the liquid crystal display element. and a metal frame that supports the liquid crystal display element by protruding an inverted T-shaped leg piece with a wide locking part at the tip of a narrow shaft part, and a metal frame that supports the liquid crystal display element. In a liquid crystal display device in which the liquid crystal display element is positioned and fixed via the metal frame by twisting the shaft portion of the leg piece inserted into the hole and locking the locking portion to the printed circuit board, A liquid crystal display device characterized in that the width of the width of a central portion in the longitudinal direction of the elongated hole is widened compared to other portions, and the shaft portion of the leg piece is disposed at the widened portion.