CN2833655Y

CN2833655Y - Liquid crystal display module

Info

Publication number: CN2833655Y
Application number: CN 200520067550
Authority: CN
Inventors: 任强
Original assignee: CHINA DISPLAY TECHNOLOGY Co Ltd
Current assignee: China Shenzhen Display Technology Co., Ltd.
Priority date: 2005-11-22
Filing date: 2005-11-22
Publication date: 2006-11-01
Anticipated expiration: 2015-11-22

Abstract

The utility model discloses a liquid crystal display module, wherein a ground layer (3) and a power source layer (4) are orderly arranged from top to bottom between a top layer (1) and a bottom layer (2) of a circuit board of the liquid crystal display module. The ground layer is a foil layer covered with copper, and is connected with the lower end of the power source and used as the ground line of the top layer. The electrical connection between each corresponding signal line of the top layer and the ground layer is realized through a plurality of through holes passing through the layers, the power source layer is especially used for arrangement of the power source lines, and the corresponding signal lines in the top layer can respectively connected with the ground layer through a static protector (5). After the utility model is used, the circuit in the circuit board can be shortened and the return flow area of the signals is reduced. Therefore, the outer radiation of the circuit is reduced, and simultaneously, the anti-jam ability and the anti-static ability can be improved greatly.

Description

The liquid crystal display module

Technical field

The utility model relates to a kind of liquid crystal display module, relates in particular to a kind of antistatic, jamming-proof liquid crystal display module.

Background technology

Liquid crystal display (LCD) module has been widely used in every field now as display device very much, what the drive circuit board of existing liquid crystal display module adopted is doubling plate, comprise top layer and bottom, what bottom was mainly walked is the driver circuit of LCD, and some chip for driving of LCD and interlock circuit mostly are arranged on top layer, aforementioned interlock circuit can comprise the auxiliary circuit of chip for driving, the negative pressure circuit, the IC bleeder circuit, power lead, various and ground wire that all join with the power supply low side of signal wire and quantity or the like, the distribution method of this structure and circuit generally can produce following defective: 1. each the tediously long circuit that gathers makes drive circuit board bigger to external radiation when work, be difficult to satisfy the safety standard relevant with radiation, on the other hand, the capability of resistance to radiation of drive circuit board also a little less than; 2. the power lead that does not give effective isolation tends to signal wire is produced undue disturbance; In addition, the negative pressure circuit also can produce the IC bleeder circuit and disturb; 3. the signal backflow area that forms when signal transmits in tediously long, various circuit is quite big, thereby makes that the external antijamming capability of drive circuit board is less; 4. liquid crystal indicator itself generally is directly in the face of the operator's; because human body has static through regular meeting; the sassafras that perhaps rubs also can produce static; its voltage generally can reach 3000 volts; sometimes even up to volt up to ten thousand; when operation or touch liquid crystal display device; the high-pressure electrostatic that passes over from framework tends to be transferred on the drive circuit board; disturb the operate as normal of drive circuit board; also can cause burning of electronic devices and components on the drive circuit board when serious; damage; the normal display quality and the whole service life of liquid crystal display module have been reduced; especially when needs are selected the bigger display device of metal framework fixed measure for use; this problem is more apparent outstanding, and the ground wire that reason just is to be used for release electrostatic is comparatively elongated; narrow, pressure release is limited in one's ability.The liquid crystal display module that aforementioned these reasons cause existing this structure is when noise disturbs strong or meet the higher static of voltage, and frequent appearance in service such as crashes, disorderly shows at phenomenon, therefore is necessary deeply to be improved.

Summary of the invention

For overcoming the defective of above-mentioned prior art, the liquid crystal display module that provides a kind of antijamming capability higher, lower to external radiation is provided technical problem to be solved in the utility model.

The further purpose of the utility model provides a kind of liquid crystal display module with stronger antistatic effect.

For solving the problems of the technologies described above, the utility model proposes a kind of liquid crystal display module, the circuit board of described liquid crystal display module comprises the bottom that is used to lay the LCD driver circuit, be used to lay chip for driving and the auxiliary circuit of LCD, the negative pressure circuit, the IC bleeder circuit, the top layer of signal wire, between described top layer and bottom from top to bottom, be disposed with stratum and bus plane, described stratum is for to join with the power supply low side, and as circuit ground in the top layer cover the Copper Foil lamella, described top layer is by realizing being electrically connected between each corresponding signal line and the stratum in the top layer respectively through a plurality of via holes of interlayer; Described bus plane is used to lay power lead.

Further, each corresponding signal line in the aforementioned top layer or data line can be realized being connected by an electrostatic protector and described stratum respectively.

On this basis, above-mentioned negative pressure circuit and IC bleeder circuit further can the be placed in zones of different of top layer.

Because the utility model adopts four-sheet structure, increased and to have made configuration more optimize for the area of wiring; Need the signal wire of ground connection or data line to be connected as the stratum of ground wire by in via hole and the top layer, like this, will shorten the length of ground wire and line related (as signal wire or data line) greatly, can reduce on the one hand whereby liquid crystal display module circuit board to external radiation, can also improve capability of resistance to radiation simultaneously; Short circuit can also effectively reduce the signal backflow area of top layer, has improved the external antijamming capability of drive circuit board, and having reduced extraneous noise interference may be to the infringement of wiring board; And the bus plane that sets up is separated by the stratum, effectively power lead and signal wire is isolated, and has also further reduced the interference of power lead to signal wire.

On this basis, can block external static effectively by the electrostatic protector of setting up returns from ground wire and goes here and there drive circuit board, thereby can prevent that static may be to showing the infringement of the electron device in the module, guarantee that the utility model avoids the whole service life of electrostatic interference and liquid crystal display module in operate as normal; By negative pressure circuit and the IC bleeder circuit that sets up layout separately, also can avoid interference between the two, improve job stability of the present utility model and display quality.

Description of drawings

Fig. 1 is the cross section structure synoptic diagram of the circuit board of liquid crystal display module described in the utility model;

Fig. 2 is the circuit connection diagram between top layer signals line described in the utility model and the stratum.

Embodiment

With reference to accompanying drawing, in a kind of implementation of the present utility model, the circuit board of liquid crystal display module adopts four-sheet structure, is followed successively by top layer 1, stratum 3, bus plane 4 and bottom 2 from top to bottom; Top layer 1 is mainly used in circuits such as the chip for driving of laying LCD and auxiliary circuit, negative pressure circuit, IC bleeder circuit, signal wire; Stratum 3 is one and covers the Copper Foil lamella, with power supply low side join (or ground connection), ground wire as each circuit in the top layer 1, top layer 1 is by realizing being electrically connected between each corresponding signal line and the stratum in the top layer respectively through a plurality of via holes of top layer and ground interlayer, because covering the Copper Foil lamella, itself to have ground connection effective, for tediously long in compared to prior art of the pressure release ability of static, fine and closely woven ground wire will exceed a lot, this antistatic effect for circuit board and liquid crystal display module also can play booster action, what is more important: single-row stratum makes the circuit of top layer lay more convenient, free, concerning the data or signal wire that need ground connection, via hole between design level nearby, for the optimal design of concrete circuit has been created good condition, also shortened simultaneously the length of ground wire and related data or signal wire greatly, circuit itself improves external radiation and capability of resistance to radiation thus; Signal backflow area in the top layer is reduced, the interference free performance grow of circuit board and liquid crystal display module;

Bus plane is mainly used to lay power lead, and by effective obstruct on stratum, the power lead in the circuit board alleviates significantly to the interference of signal wire, and also having increased simultaneously can be for the area of wiring in the top layer;

On this basis, when top line is laid, make the be placed in zones of different of top layer of negative pressure circuit and IC bleeder circuit, just can effectively avoid the phase mutual interference between two circuit, especially the negative pressure circuit is to the interference of IC bleeder circuit.

In order further to improve antistatic effect of the present utility model; being connected and realizing by the serial connection of electrostatic protector between each signal wire in above-mentioned top layer or data line and the stratum; specifically be exactly to make each corresponding signal line or data line realize being connected with stratum 3 by an electrostatic protector 5 respectively; as shown in Figure 2, figure middle and upper part horizontal line need to represent the signal wire or the data line of ground connection.Like this; when the generation of static electricity of big voltage; electrostatic protector 5 work; static on the signal wire can export to the stratum fast; pressure release rapidly; thereby the electronic devices and components operate as normal in the assurance circuit board is unlikely and is damaged, and improves job stability, display quality and the serviceable life of liquid crystal display module.

Experimental results show that, after adopting the utility model, do esd immunity test (ESD), the static gun head directly contact chase discharge reach 4000 volts, when the sky discharge reaches 8000 volts, the drive circuit board of liquid crystal display module can not damage, normal, high-quality demonstration still can be arranged, and effect is very good.Particularly when the liquid crystal display module uses metal framework, in the environment that manufactured goods use, the occasion that static is frequent, as a kind of liquid crystal dot matrix that is applied on the tax control machine shows that module uses the utility model, its normal working performance and whole service life can both be significantly improved, and can reach existing European standard fully in radioresistance with aspect external radiation.

Claims

1. liquid crystal display module, the circuit board of described liquid crystal display module comprises the bottom (2) that is used to lay the LCD driver circuit, it is characterized in that: the chip for driving and the auxiliary circuit that are used to lay LCD, the negative pressure circuit, the IC bleeder circuit, the top layer of signal wire (1), between described top layer (1) and bottom (2) from top to bottom, be disposed with stratum (3) and bus plane (4), described stratum (3) is for to join with the power supply low side, and as circuit ground in the top layer (1) cover the Copper Foil lamella, described top layer (1) is by realizing being electrically connected between each corresponding signal line and the stratum in the top layer respectively through a plurality of via holes of interlayer; Described bus plane (4) is used to lay power lead.

2. a kind of liquid crystal display module as claimed in claim 1 is characterized in that: each corresponding signal line in the described top layer or data line can be realized being connected by an electrostatic protector (5) and described stratum (3) respectively.

3. a kind of liquid crystal display module as claimed in claim 1 or 2 is characterized in that: the be placed in zones of different of top layer of described negative pressure circuit and IC bleeder circuit.