JPH11149086A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device excellent in reducing a stress to a driver LSI, especially at a time of inserting a connector. SOLUTION: A connector and a cable mated to a connector 11G mounted on the back of a printed wiring board 11B is vertically inserted in the plane of the printed wiring board 11B, and a stress concentration uniformalizing means is provided, which is caused in a driver LSI 11D when they are inserted. As the uniformalizing means, the connector 11G is mounted just on the back of the driver LSI 11D, or the circuit board 11B is provided with notches 14 between the drivers LSI 11D. Thus, breakdown of the drivers LSI 11D can be reduced by uniformalizing a force at the time of inserting the connector by the stress concentration uniformalizing means.

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 for displaying characters and images and using a connector for signal input.

[0002]

2. Description of the Related Art In FIG. 3 showing a conventional example, as components of a liquid crystal display device, a liquid crystal display module 11 including a liquid crystal display panel 11A, a scanning signal circuit board 11B, two display signal circuit boards 11C, etc. Resin frame 12
A, a lighting unit 12 including a light guide plate 12B, a lamp unit 12C, and the like, and a metal frame 13 are raised. Then, these members 11, 12, and 13 are assembled in a vertical relationship as shown in FIG. 3 with the lighting unit 12 being an intermediate position.

The circuit board 1 of the liquid crystal display module 11
1B and 11C, a driving circuit is mounted, and a tape carrier package (TC) is mounted on the scanning signal circuit board 11B.
P) 11F is mounted. This tape carrier package 11F is configured by bonding a driver LSI 11D on a wiring pattern of a film carrier 11E and coating the wiring with a resin. The driver output side of the tape carrier package 11F is connected to the liquid crystal display panel 11A with an anisotropic conductive adhesive, and the input side is soldered to a scanning signal circuit board 11B on which circuit components such as an operational amplifier are mounted. There are many.

A connector 11 for supplying signals from the outside is provided on the back surface of the same printed circuit board on which the tape carrier package 11F of the scanning signal circuit board 11B is mounted.
G is implemented. The mounting position of the connector 11G may straddle the two tape carrier packages 11F. At this time, the force at the time of inserting a compatible connector into the connector 11G exerts concentrated stress on the driver LSI 11D.

[0005]

The liquid crystal display device constructed as described above is mainly used for word processors, notebook personal computers and the like because of its small outer shape and low current consumption. In recent years, with the downsizing of notebook computers and the enlargement of screens, liquid crystal display devices have been required to have narrower frames up to the outer shape outside the effective display area. However, narrowing the frame narrows the distance between the cold-cathode tube and the driving circuit components and the liquid crystal display panel. Therefore, the area of the printed circuit board on which the circuit components are mounted is further reduced.

A connector for receiving a signal from a notebook computer or the like is mounted on the printed circuit board, and circuit components such as a driver LSI and an operational amplifier in a tape carrier package are also mounted on the same printed circuit board by soldering. At this time, the driver LSI itself is arranged on the printed circuit board.

When the area of the printed circuit board is reduced, the mounting distance between the connector 11G and the driver LSI 11D is shortened, and the connector 11G is mounted on the back surface of the printed circuit board on which the driver LSI 11D is mounted. At this time, when a compatible connector is inserted into the connector 11G in a direction perpendicular to the plane of the printed circuit board, the force is applied through the printed circuit board to the driver L on the rear surface.
When a stress is applied to one point in the driver LSI 11D and the stress is applied to one point in the driver LSI 11D, the driver LSI 1
This causes 1D chip cracking and coat cracking. In particular, when the arrangement of the connector 11G extends between the two driver LSIs 11D, this driver LSI
11D is easily broken.

An object of the present invention is to provide a liquid crystal display device which is excellent in reducing a force applied to a drive circuit component when a compatible connector is inserted into a connector or a cable, and preventing breakage of the drive circuit component. is there.

[0009]

In order to achieve this object, in a liquid crystal display device according to the present invention, a connector and a cable compatible with a connector mounted on a back surface of a printed circuit board are arranged on a flat surface of the printed circuit board. It is inserted vertically and is provided with means for equalizing the concentrated stress generated in the driver LSI at the time of insertion.

According to the present invention, the force at the time of inserting the connector is made uniform by the means for making the concentrated stress uniform so that the destruction of the driver LSI can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a liquid crystal display device in which a driving circuit is mounted on a printed circuit board, wherein a connector is mounted on a back surface of the printed circuit board on which a driver LSI is mounted. A liquid crystal display device in which a connector and a cable compatible with the mounted connector are inserted perpendicular to the plane of the printed circuit board, and a means for equalizing concentrated stress generated in the driver LSI at the time of insertion is provided. By means of equalization of
By receiving the force when the connector is inserted uniformly on the printed circuit board side, it is possible to reduce the destruction of the driver LSI.

According to a second aspect of the present invention, there is provided the liquid crystal display device according to the first aspect, wherein the concentrated stress uniforming means is configured to apply a uniform force to the driver LSI when the connector is inserted. Since the connector is arranged directly behind the driver LSI, and the force at the time of inserting the connector is uniformly received by the entire driver LSI, it is possible to avoid concentrated stress in the driver LSI. Therefore, destruction of the driver LSI can be reduced.

According to a third aspect of the present invention, there is provided the liquid crystal display device according to the first aspect, wherein the concentrated stress uniformizing means is configured to apply a uniform force to the driver LSI when the connector is inserted. When the printed circuit board between the driver LSIs is cut, and the connector is arranged over two driver LSIs, the force at the time of inserting the connector is evenly applied to the driver LSI by the cut between the driver LSIs. And the driver LSI is hardly stressed intensively. Therefore, destruction of the driver LSI can be reduced.

An embodiment of the present invention will be described below with reference to FIGS. (Embodiment 1) In FIG. 1, the components of the liquid crystal display device which are the same or substantially the same as those of the above-mentioned conventional configuration are denoted by the same reference numerals, and the details thereof are omitted.
That is, 11 is a liquid crystal display module, 11A is a liquid crystal display panel, 11B is a scanning signal circuit board (printed circuit board), 11C is two display signal circuit boards, 11D is a driver LSI, 11E is a film carrier, and 11F is a tape carrier package. (TCP), 11G is a connector, 12 is a lighting unit, 12A is a resin frame, 12
B indicates a light guide plate, 12C indicates a lamp unit, and 13 indicates a metal frame.

In the first embodiment, the connector 11
The arrangement of G is right behind one tape carrier package 11F. According to the first embodiment, the force applied when the mating connector is inserted into the connector 11G is received by the entire tape carrier package 11F and is uniformly applied to the driver LSI. Concentrated stress can be avoided, so that destruction of the driver LSI 11D can be prevented. (Embodiment 2) In the embodiment 2 shown in FIG. 2, when the connector 11G is arranged over the back between two tape carrier packages 11F, the tape carrier adjacent to the two tape carrier packages 11F is used. Scan signal circuit board (circuit board) 1 between packages 11F
1B has a linear cut 14 formed therein.

According to the second embodiment, the connector 1
When the mating connector is inserted into the 1G, the stress intensively applied in the tape carrier package 11F is received as the scanning signal circuit board (circuit board) 11B, and is uniformly applied to the driver LSI. ,
Concentrated stress on the driver LSI 11D can be avoided, so that the destruction of the driver LSI 11D can be prevented.

[0017]

As described above, according to the present invention, by having a structure for uniformly receiving the force when the connector is inserted,
This is of great industrial value in that destruction of the driver LSI can be reduced.

[Brief description of the drawings]

FIG. 1 shows the first embodiment of the present invention and is an exploded perspective view of a liquid crystal display device.

FIG. 2 shows the second embodiment of the present invention and is an exploded perspective view of a liquid crystal display device.

FIG. 3 is an exploded perspective view of a liquid crystal display device showing a conventional example.

[Explanation of symbols]

 Reference Signs List 11 liquid crystal display module 11A liquid crystal display panel 11B scanning signal circuit board (printed circuit board) 11C display signal circuit board 11D driver LSI 11E film carrier 11F tape carrier package (TCP) 11G connector 12 lighting unit 12A resin frame 12B light guide plate 12C lamp unit 13 Metal frame 14 notch

Claims (3)

[Claims] 1. A liquid crystal display device in which a driving circuit is mounted on a printed circuit board, a connector is mounted on a back surface of the printed circuit board on which a driver LSI is mounted, and a connector and a cable compatible with the mounted connector are printed. A liquid crystal display device which is inserted perpendicular to a plane of a substrate and provided with means for equalizing concentrated stress generated in a driver LSI at the time of insertion. 2. A device according to claim 1, wherein said means for uniformizing the concentrated stress comprises a connector disposed directly behind the driver LSI so that a force is uniformly applied to the driver LSI when the connector is inserted. Liquid crystal display. 3. The printed circuit board between the driver LSIs is cut so that the concentrated stress uniformizing means applies a uniform force to the driver LSI when the connector is inserted. Liquid crystal display device.