CN2833653Y

CN2833653Y - Liquid crystal display module with electrostatic protection function

Info

Publication number: CN2833653Y
Application number: CN 200520067314
Authority: CN
Inventors: 谢宏德
Original assignee: 深圳市新深辉显示技术有限公司
Current assignee: CHINA SHENZHEN DISPLAY TECHNOLOGY Co Ltd
Priority date: 2005-11-09
Filing date: 2005-11-09
Publication date: 2006-11-01
Anticipated expiration: 2015-11-09

Abstract

The utility model discloses a kind of liquid crystal display module with electrostatic protection function; comprise the liquid crystal display drive circuit (1) that is used to drive LCD MODULE; and be used for described LCD MODULE is inlayed the framework (2) that lumps together; framework is connected with the working power ground wire; also comprise filtering circuit (3); two input ends of filtering circuit respectively with the height of working power; low side joins; two output terminals are then just imported with the power supply of liquid crystal display drive circuit respectively; negative pin joins; the height of working power; can also further be parallel with discharge resistance R between the low side; after adopting the utility model; by filtering circuit and the discharge resistance R that sets up; can just prevent effectively; negative static may be to the infringement of the electron device in the display driver circuit; guarantee that the utility model avoids electrostatic interference when operate as normal, improve whole service life.

Description

Liquid crystal display module with electrostatic protection function

Technical field

The utility model relates to the liquid crystal display module, relates in particular to chip for driving nation and fixes on the circuit improvement of (liquidcrystal display module is called for short LCM) of liquid crystal display module (chip on board), that abbreviate the COB type as on the specific plate.

Background technology

Liquid crystal display module LCM has been widely used in every field now as display device very much, and LCM mainly is made of driving circuit and the display panels parts such as (LCD) that are controlled by driving circuit.Wherein, COB type LCM is when reality is used, and aforementioned these parts need also that the enough frameworks of intensity are fixing securely with it, edge lumps together, when size of display panels is big, generally metal framework need be selected for use, concrete request for utilization can be satisfied as chase.As display device 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 15000 volts; when operation or touch display unit; from framework or display panels; perhaps the high-pressure electrostatic that passes over of other place tends to be transferred on the driving circuit; disturb the operate as normal of driving circuit; also can cause burning of electronic devices and components on the driving circuit when serious; damage; the normal display quality and the whole service life of liquid crystal display module have been reduced; especially when selecting for use metal framework to fix each display device; this problem is more apparent outstanding; for this reason; way commonly used is that place of working (0 volt-line) pin with framework and LCM driving circuit links; so that static discharges by power supply; as shown in Figure 1; if but this moment working power when failing ground connection or imperfect earth; when perhaps electrostatic potential is higher; then static still can return by the pin between power supply and the LCM driving circuit and scurry in the LCM driving circuit; therefore be difficult to thoroughly eliminate the harmful effect that static brings; especially when selecting metal framework fixed L CM display module for use, this problem is more apparent outstanding.

Summary of the invention

For overcoming the defective of above-mentioned prior art, technical problem to be solved in the utility model is intended to provide a kind of liquid crystal display module with electrostatic protection function.

For solving the problems of the technologies described above; the utility model proposes a kind of liquid crystal display module with electrostatic protection function; comprise the liquid crystal display drive circuit that is used to drive LCD MODULE; and be used for described LCD MODULE is inlayed the framework that lumps together; described framework is connected with the working power ground wire; two input ends of described filtering circuit join with the high and low end of described working power respectively, and two output terminals of filtering circuit are imported positive and negative pin with the power supply of described liquid crystal display drive circuit respectively and joined.

After adopting said structure, owing between the positive and negative electrode of liquid crystal display drive circuit and described working power, be provided with filtering circuit, utilize the blocking effect of this filtering circuit to static, the bad interference that static may form display driver circuit be can prevent effectively, thereby the normal display quality and the whole service life of liquid crystal display module guaranteed.

Description of drawings

Fig. 1 is the circuit block diagram of existing liquid crystal display module;

Fig. 2 is to use the circuit block diagram of a kind of embodiment of the utility model liquid crystal display module;

Fig. 3 is the circuit theory diagrams of a kind of embodiment of the utility model liquid crystal display module.

Embodiment

As stated in the Background Art; static mostly is the easy display driver circuit 1 that is delivered to power supply and is connected with power supply with the position of extraneous contact from framework 2 grades; for this reason; with reference to accompanying drawing 2; in a kind of implementation of the present utility model; liquid crystal display module with electrostatic protection function; comprise the liquid crystal display drive circuit 1 that is used to drive LCD MODULE; and be used for described LCD MODULE is inlayed the framework 2 that lumps together; described framework 2 and working power ground wire; that is the low side of working power connects; scurry the bad interference that may form display driver circuit by returning of power supply wiring for preventing static effectively; the utility model is just imported at the power supply of liquid crystal display drive circuit 1 especially; the height of negative pin and described working power; be provided with filtering circuit 3 between the low side; two input ends of this filtering circuit 3 respectively with the height of working power; low side joins; two output terminals of filtering circuit 3 are just imported with the power supply of liquid crystal display drive circuit 1 respectively; negative pin joins; so just can utilize the blocking effect of filtering circuit to static; avoid the electronic devices and components in the display driver circuit to be subjected to moment; high-tension impact; guarantee that it can work stably and normally, the normal working performance of liquid crystal display drive circuit can significantly improve.

In order further to improve the effect of liquid crystal display module blocking-up static described in the utility model, can be on the foregoing circuit basis, further between the high and low end of working power, also be connected with discharge resistance R, this discharge resistance R generally uses resistance to be tens kilo-ohms according to general knowledge and gets final product, and main effect is discharge.

Itself can have multiple design above-mentioned filtering circuit, in the utility model, used a kind of comparatively common filtering circuit, with reference to Fig. 3, it can specifically comprise: articulating first capacitor C 1, first inductance L 1, second capacitor C 2, second inductance L 2 together in turn; The two ends of aforementioned second capacitor C 2 join with the positive and negative electrode of display driver circuit 1 respectively as two output terminals of filtering circuit 3, and the two ends of first capacitor C 1 then join with the high and low end of described working power respectively as two input ends of filtering circuit 3; During work if there is high-pressure electrostatic to transmit from working power, to effectively be blocked by the filtering circuit that first capacitor C 1, first inductance L 1, second capacitor C 2, second inductance L 2 constitute, in the special parallel discharge resistance R of two input ends of filtering circuit 3, be used for leakage current.Substantially the noise that does not have static to cause at the output terminal of filtering circuit disturbs like this, and liquid crystal display drive circuit 1 also can not be subjected to the influence of static, still can continue operate as normal; VDD, VSS among the figure (0 volt-line) represent the high and low end (being ground wire) of working power respectively, the electric signal streams the when direction of arrow among Fig. 2 is represented operate as normal to.

Above-mentioned filtering circuit and discharge resistance R mainly make of being interference and the infringement that the protection liquid crystal display drive circuit is avoided static.

After adopting foregoing circuit, the utility model is after having set up filtering circuit 3 and discharge resistance R between the positive and negative electrode of the high and low end of working power and display driver circuit, do esd immunity test (ESD) for COB type liquid crystal display module, the static gun head directly contact chase discharge reach 8000 volts, when the sky discharge reaches 15000 volts, the liquid crystal display module still can have normal demonstration, effect is all very good, particularly when using metal framework, the normal working performance of liquid crystal display module and whole service life can both be significantly improved.

Claims

1. liquid crystal display module with electrostatic protection function; comprise the liquid crystal display drive circuit (1) that is used to drive LCD MODULE; and be used for described LCD MODULE is inlayed the framework (2) that lumps together; described framework (2) is connected with the working power ground wire; it is characterized in that: also comprise filtering circuit (3); two input ends of described filtering circuit (3) join with the high and low end of described working power respectively, and two output terminals of filtering circuit (3) are imported positive and negative pin with the power supply of described liquid crystal display drive circuit (1) respectively and joined.

2. the liquid crystal display module with electrostatic protection function as claimed in claim 1 is characterized in that: also be parallel with discharge resistance R between the high and low end of described working power.

3. the liquid crystal display module with electrostatic protection function as claimed in claim 1 or 2 is characterized in that: described filtering circuit (3) can be articulating first capacitor C 1, first inductance L 1, second capacitor C 2, second inductance L 2 together in turn; The two ends of described second capacitor C 2 are imported positive and negative pin with the power supply of described display driver circuit (1) respectively as two output terminals of filtering circuit (3) and are joined, and the two ends of described first capacitor C 1 join as two input ends of filtering circuit (3) high and low end respectively at described working power.