JPH02304589A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To easily perform the maintenance work by providing L-shaped holes and providing claws which are closed to the inside till passing holes but are opened to the outside and are engaged with and electrically connected to earth patterns after passing holes at the time of insertion from the surface side of a printed board. CONSTITUTION:Earth patterns 1b are provided on the rear face around L-shaped holes 1c in a printed board 1; and hen insertion parts 7a are inserted to holes 1c from the surface side of the printed board 1, claws 7b are closed to the inside till passing holes 1c, and they are opened to the outside and are engaged with and electrically connected to earth patterns 1b after passing holes 1c. Consequently, when insertion parts 7a of a liquid crystal display plate holding case 7 are inserted to holes 1c of the printed board 1, claws 7b are opened after passing holes and are engaged with and are electrically connected to earth patterns 1b. When the tip of a driver is inserted to L-shaped holes 1c to close claws 7b to the inside, claws 7b are disengaged from the printed board 1 and the liquid crystal display plate holding case 7 can be detached from the printed board 1. Thus, the maintenance work for replacement or the like is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a liquid crystal display device that protects electronic components such as LSIs from static electricity.

BACKGROUND OF THE INVENTION In recent years, the development of electronic technology has been remarkable, simplification of structures has been required, and usage conditions have become stricter.

Therefore, it is necessary to protect electronic components such as LSIs from severe usage conditions.

FIG. 3 is an exploded perspective view showing a conventional liquid crystal display device, and FIG. 4 is a partial perspective view showing the grounding state of the liquid crystal display board holding case to the printed circuit board.

In FIGS. 3 and 4, when assembling the liquid crystal display device, first connect the terminals of the lamp 2 to the wiring pattern (not shown) on the printed circuit board 1, and place the lamp 2 in the recess 3a of the light guide block. 3 is placed on the printed circuit board 1.

Next, after placing the liquid crystal display board 4 on the light guide block 3, the liquid crystal display board 4. A conductive liquid crystal display board holding case 5 is placed so as to accommodate the leading block 3 and the lamp 2, and a plurality of insertion portions 5a are inserted into the respective holes 1a.

Next, as shown in FIG. 4, the insertion portion 5 passing through the hole 1a
By bending a, the insertion portion 5a is engaged with the printed circuit board 1, and the liquid crystal display board holding case 5 is attached to the printed circuit board 1.

At this time, the terminals of the liquid crystal display board 4 are connected to the wiring pattern of the printed circuit board 1.

Next, solder 6 connects the insertion portion 5a to the ground pattern 1b.
conduction with.

(Problem to be Solved by the Invention) However, in the above conventional liquid crystal display device, the lamp 2
Or, when replacing the liquid crystal display board 4, the ground pattern 1b of the printed circuit board 1 and the insertion part 5 of the liquid crystal display board holding case 5
It is necessary to remove the solder 6 that makes the terminal a conductive, return the bent insertion portion 5a to its original state, and remove the liquid crystal display board holding case 5.

Therefore, there was a problem in that maintenance work was time-consuming.

The present invention is intended to solve these conventional problems, and it is an object of the present invention to provide a liquid crystal display device that can be easily maintained.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a ground pattern on the back surface around an L-shaped hole provided in a printed circuit board, and provides a liquid crystal display board holding case with a width equal to the length of the hole. an insertion portion that is substantially aligned with the hole and inserted vertically into the hole from the front side of the printed circuit board; When the insertion part is inserted into the hole from the surface side of the printed circuit board, it contracts inward until it passes through the hole, and after passing through the hole, it expands outward and has a claw that engages with the ground pattern and conducts it. It is something that

(Function) Therefore, according to the present invention, by inserting the insertion part of the liquid crystal display device holding case into the hole of the printed circuit board, the claws expand after passing through the hole and engage with the ground pattern. Pattern conduction.

For example, by inserting the tip of a screwdriver into the L-shaped hole and retracting the claw inward, the engagement of the claw with the printed circuit board can be released, making it possible to remove the LCD display board holding case from the printed circuit board. can.

(Embodiment) FIG. 1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is a partial perspective view showing a grounding state of a liquid crystal display board holding case to a printed circuit board.

In FIGS. 1 and 2, reference numeral 1 denotes a printed circuit board, on the back of which a ground pattern 1b is provided, and a plurality of L-shaped hole ICs are provided near the ground pattern 1b.

Reference numeral 2 indicates a lamp connected to a wiring pattern of the printed circuit board 1 (not shown); 3 indicates a light guide block as a light guide plate; recesses 3a in which the lamps 2 are located are provided on the left and right sides of the light guide block 3;

Reference numeral 4 indicates a liquid crystal display board connected to the wiring pattern of the printed circuit board 1, and is illuminated by the lamp 2 from the back side.

Reference numeral 7 indicates a conductive liquid crystal display board holding case, and lamp 2.
An insert B 7 a is provided to accommodate the light guide block 3 and the liquid crystal display board 4 , and is inserted into the hole IC of the printed circuit board 1 from the front side to the back side. A claw 7b is provided that expands outward in a V-shape from the side to the front side, and the tip of the claw 7b is sawtooth-shaped.

Note that the width of the insertion portion 7a is made to substantially match the length of the hole IC.

Next, the above embodiment will be explained.

In the above embodiment, when assembling the liquid crystal display device, first connect the terminals of the lamp 2 to the wiring pattern of the printed circuit board 1, and place the leading block 3 on the printed circuit board 1 so that the lamp 2 is located in the recess 3a. do.

Next, after placing the liquid crystal display board 4 on the light guide block 3, the liquid crystal display board 4. When the liquid crystal display board holding case 7 is placed over the light guiding block 3 and the lamp 2 and the plurality of insertion parts 7a are inserted into the respective holes 1c from the surface side of the printed circuit board 1, the claws 7b penetrate the holes 1c. It contracts and closes inward until it passes through the hole 1c, and expands outward after passing through the hole 1c.As shown in FIG. It can be attached to the substrate 1, and the claw 7b is electrically connected to the ground pattern 1b.

At this time, since the terminals of the liquid crystal display board 4 are connected to the wiring pattern of the printed circuit board 1, and the tips of the claws 7b are sawtooth-shaped, the claws 7b are reliably electrically connected to the ground pattern 1c, and the liquid crystal display The plate holding case 7 can be at ground potential.

Therefore, since the liquid crystal display board holding case 7 can be set to a ground potential, electronic components such as an LSI provided on the printed circuit board 1 can be protected from static electricity.

When removing the liquid crystal display board protective case 7 from the printed circuit board 1, for example, insert the tip of a screwdriver from the front surface side of the printed circuit board 1 into the hole 1c and bring it into contact with the claw 7b.
By contracting and closing the claws 7b inward, the engagement of the claws 7b with the printed circuit board 1 can be released.
It can be extracted from c.

Therefore, the liquid crystal display board holding case 7 is attached to the printed circuit board 1.
Since it can be easily removed from the lamp, maintenance work such as replacing the lamp 2 and the liquid crystal display panel 4 can be easily performed.

・〈Effects of the Invention〉As is clear from the above embodiments, this invention provides a ground pattern on the back side around an L-shaped hole provided in a printed circuit board, and a liquid crystal display board holding case with a width equal to that of the hole. An insertion part that is made to substantially match the length of the printed circuit board and is inserted vertically into the hole from the front side of the printed circuit board, and an insertion part that is expanded outward in a V-shape from the back side of the printed circuit board to the front side of the printed circuit board. When the insertion part is inserted into the hole from the front side of the printed circuit board, it contracts inward until it passes through the hole, and then expands outward after passing through the hole to engage the ground pattern and create a conductive claw. For example, the tip of the driver can be placed L from the front side of the printed circuit board.
By inserting the case into the letter-shaped hole and abutting the claw, and contracting and closing the claw inward, the engagement of the claw with the printed circuit board can be released, allowing the liquid crystal display board holding case to be removed from the printed circuit board.

Therefore, since the liquid crystal display board holding case can be easily removed from the printed circuit board, maintenance work such as replacing the lamp and the liquid crystal display board can be easily performed.

In addition, since the tips of the claws are made into a sawtooth shape, when the LCD display board holding case is attached to the printed circuit board, the claws are reliably connected to the ground pattern, making it possible to ensure that the LCD display board holding case is at ground potential. There is an effect that it can be done.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a liquid crystal display device according to an embodiment of the present invention, Fig. 2 is a partial perspective view showing the grounding state of the liquid crystal display plate holding case to the printed circuit board, and Fig. 3 is a conventional liquid crystal display. FIG. 4 is an exploded perspective view showing the device, and FIG. 4 is a partial perspective view showing the grounding state of the liquid crystal display board holding case to the printed circuit board. 1... Printed circuit board, 1b... Earth pattern 1,
IC...hole, 2...lamp, 3...light guide block, 3a...recess, 2...liquid crystal display board, 7...liquid crystal display board holding case, 7a...insertion part, 7b ···nail. Name of agent: Patent attorney Shigetaka Awano (1 person)

Claims (2)

[Claims] (1) A printed circuit board with an L-shaped hole and a ground pattern on the back side around the hole, a lamp attached to the surface of this printed circuit board, and a lamp that directs the light of this lamp to the liquid crystal display board. a light guide plate that guides the printed circuit board toward the rear side; a light guide plate that accommodates the lamp, the light guide plate, and the liquid crystal display panel, has a width that substantially matches the length of the hole, and is inserted vertically into the hole from the front side of the printed circuit board; The insertion part is provided in the insertion part to expand outward in a V-shape from the back side of the printed circuit board to the front side, and when the insertion part is inserted into the hole from the front side of the printed circuit board, the hole is expanded. and a conductive liquid crystal display plate holding case having a claw that contracts inward until passing through the hole and expands outward after passing through the hole to engage and conduct the ground pattern. . (2) The liquid crystal display device according to claim (1), wherein the tip of the claw that contacts the ground pattern has a sawtooth shape.