CN204331212U - A kind of esd protection structure for COG liquid crystal display - Google Patents
A kind of esd protection structure for COG liquid crystal display Download PDFInfo
- Publication number
- CN204331212U CN204331212U CN201520040134.6U CN201520040134U CN204331212U CN 204331212 U CN204331212 U CN 204331212U CN 201520040134 U CN201520040134 U CN 201520040134U CN 204331212 U CN204331212 U CN 204331212U
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- Prior art keywords
- liquid crystal
- esd
- crystal display
- pcb board
- cog
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Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 28
- 239000011521 glass Substances 0.000 claims abstract description 17
- 239000000758 substrate Substances 0.000 claims abstract description 14
- 238000009826 distribution Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 8
- 230000001681 protective effect Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 210000002858 crystal cell Anatomy 0.000 description 2
- 241000283070 Equus zebra Species 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000005357 flat glass Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The utility model discloses a kind of esd protection structure for COG liquid crystal display; described operator guards includes operation circuit and IC, pcb board, polaroid and glass substrate;=be provided with ESD line between described polaroid and glass substrate; and the surrounding distribution of the operation circuit that arranges in polaroid and glass substrate of described ESD line and IC, and be connected to the earth terminal of pcb board.The utility model adopts the ESD line of low cost, serves effective protective effect, solve vehicle-mounted, industry to the ESD protection of COG liquid crystal display, the problem that the antistatic effect of medical COG Liquid Crystal Module is low, has low cost, compatible good feature.
Description
Technical field
The utility model belongs to the technical field of display and control, particularly a kind of liquid crystal anti-electrostatic protecting structure.
Background technology
Industry, vehicle-mounted, medical COG liquid crystal display, client's industry, vehicle-mounted, the industries such as medical treatment have mandatory requirement to ESD protection.Client because of Cost Problems require change used Liquid Crystal Module into COG scheme from the COB scheme of routine.COG scheme has the feature that power consumption low cost is low.But the ability of against esd greatly declines.
Reason is: from IC itself, and because integrated level is too high, IC size is too little, and cabling is too close to be caused.The scheme of such as the most frequently used 128*64 dot matrix, early stage COB scheme needs 4-6 IC, and the COG scheme of correspondence by fully integrated for the function of this 4-6 IC in the IC of a 4.84mm*0.66mm.COB scheme from a structural point, IC is that welding or nation fix on PCB.Be connected on LCD through conductive adhesive tape or PIN needle or the hot pressing zebra paper that conducts electricity by the cabling of PCB.IC to LCD has no small distance, has living space and can do the measure of some anti-ESD.And the scheme of COG, IC is directly pressed together on LCD, does not have space between IC and LCD, do any ESD safeguard procedures at all.
Metal screen layer is done in conventional anti-ESD measure, and screen layer is as far as possible complete, reduces opening and space as far as possible.Such as one closed iron-clad.Can be fallen by electrostatic screening to greatest extent like this, even if iron-clad ground connection is not fine, the effect electrostatic due to metallic shield is also difficult to enter host circuit.But Liquid Crystal Module is due to the singularity of itself, for showing.So viewing area must be exposed to outer can not protection with metallic shield.Add a transparent protective shield above at most, but can not do too thick otherwise very large on display effect impact, in most cases just thin as a piece of paper sheet only to play mechanical protection effect very weak to the protective capability of electrostatic.Also having some ways, be by the IC of COG module part with tinsel parcel also reliable ground, but this way cost is too high, cannot application in practice is produced.
Summary of the invention
For the purpose of this utility model that solves the problem is to provide a kind of esd protection structure for COG liquid crystal display; this operator guards, when having ESD function, reduces cost of manufacture as much as possible, can be widely used in vehicle-mounted; industry, in medical COG Liquid Crystal Module.
Another object of the present utility model is to provide a kind of esd protection structure for COG liquid crystal display, and this circuit structure is simple, is easy to realize, effectively can reduces production cost.
Through carefully analyzing discovery to COG module.The display section that COG module is exposed is polaroid and glass substrate, itself to be insulator electrostatic induced current be difficult to by.Follow the principle that electric current walks impedance minimal path, electrostatic induced current is actually and enters in liquid crystal cell from the junction of two sheet glass, then damages IC by the ITO cabling of conduction.
According to this research; COG again die sinking to be taken a round in the junction of glass surrounding ITO (oxidation pasture-tin oxide (being called for short ITO) conductive film) cabling; be called ESD line; as far as possible thick in the prerequisite line of balanced protection spacing, and by FPC, circuit is guided on the ground connection of mainboard.ESD line does not receive module nearby on the ground after being drawn by FPC, but receive on the ground by cabling again at interface, the principle that such electrostatic induced current follows away impedance minimal path will directly be released away from interface, if ESD circuit nearby ground connection other element so likely impacted on PCB even to recoil COG-IC.The contact pad of chase and PCB is also connected on ESD line simultaneously, also releases smoothly by this circuit when such electrostatic is got on chase.
ESD line will be protected by this to guide to when electrostatic is produced and entered in liquid crystal cell by glass junction time like this to unload systematically and run out thus reach the object of protection IC.
Therefore, the technical solution of the utility model is as follows.
A kind of esd protection structure for COG liquid crystal display; described operator guards includes operation circuit and IC, pcb board, polaroid and glass substrate; it is characterized in that being provided with ESD line between described polaroid and glass substrate; and the surrounding distribution of the operation circuit that arranges in polaroid and glass substrate of described ESD line and IC, and be connected to the earth terminal of pcb board.
Described ESD line, is connected to FPC, is connected to the earth terminal of pcb board by FPC again.
Further, described FPC is connected to the earth terminal of pcb board in F pcb board edge, and to make electrostatic induced current, that is directly released away from interface.
Described ESD line, it is that 0.2-2mm is thick, to have the impact that enough abilities accept electrostatic.
Further, described ESD line, is also connected to the metal frame of COG liquid crystal display and the contact pad of pcb board, to reduce the impact of electrostatic further, improves ESD effect.
The utility model adopts the ESD line of low cost, serves effective protective effect, solve vehicle-mounted, industry to the ESD protection of COG liquid crystal display, the problem that the antistatic effect of medical COG Liquid Crystal Module is low, has low cost, compatible good feature.
Accompanying drawing explanation
Fig. 1 is the structural representation that the utility model is implemented.
Fig. 2 is the upward view that the utility model is implemented.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1 and Figure 2, the esd protection structure that the utility model is implemented, includes operation circuit and IC 3, pcb board (existing structure, not shown in the figures), polaroid 5 and glass substrate 1.Wherein, core of the present utility model is: be provided with ESD line 2 between polaroid 5 and glass substrate 1; ESD line 2 is exactly along the ITO cabling that the junction of glass surrounding takes a round; and the surrounding distribution of the operation circuit that necessarily arranges in polaroid and glass substrate of ESD line 2 and IC 3, so that esd protection effect can be had.
Circuit is guided on the ground connection of pcb board by FPC 4 by ESD line 2.
Generally, FPC 4 is located at glass substrate 1 edge, and is connected to pcb board, and circuit is guided to the earth terminal of pcb board by ESD line 2 by FPC 4, that is directly released away from interface can to make electrostatic induced current, avoids the harmful effect that electrostatic brings operation circuit and IC.
ESD line 2, is also connected to the metal frame of COG liquid crystal display and the contact pad of pcb board, to reduce the impact of electrostatic further, improves ESD effect.
ESD line 2 requires that thickness is O.2-2mm scope usually, and to have the impact that enough abilities accept electrostatic, when not affecting COG liquid crystal display performance, ESD line 2 allows overstriking as much as possible.
Esd protection process is as follows:
1: strong electrostatic impact rush of current, on LCD, is directed on FPC 4 by ESD line 2 shielding on LCD when entering liquid crystal circuit by the crack of LCD.
The interface of Liquid Crystal Module is directly received on ESD forceful electric power road on 2:FPC 4 by the ESD line 2 on PCB.
ESD line 2 on 3:PCB plate is connected to chase pad simultaneously, and the ESD electric current that such chase bears also can be released on pcb board by this ESD line 2.
Reliably release as long as 4:PCB plate accomplishes that reliable ground just can do ESD electric current, protection main circuit.
Facts have proved: on WGM-12864COG-22N, use this scheme works clearly.Can only cross the electrostatic test of 4KV before not adding esd protection line, PCB has made a lot of process such as all IO lines and all added esd protection pipe, single sided board changes the floor file of dual platen large area.Power unit adds bulky capacitor, inductance, and discharge tube is protected.Equal DeGrain, cost also add a lot, loses more than gain.And after having added esd protection structure, adopt former single sided board, do not add any extra protection circuit.The electrostatic test of crossing 6KV that just can be stable; And only needing COG newly to open film, user rs host software and hardware does not need to do any change, low production cost, compatible good.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., all should be included within protection domain of the present utility model.
Claims (5)
1. the esd protection structure for COG liquid crystal display; described operator guards includes operation circuit and IC, pcb board, polaroid and glass substrate; it is characterized in that being provided with ESD line between described polaroid and glass substrate; and the surrounding distribution of the operation circuit that arranges in polaroid and glass substrate of described ESD line and IC, and be connected to the earth terminal of pcb board.
2., as claimed in claim 1 for the esd protection structure of COG liquid crystal display, it is characterized in that described ESD line, be connected to FPC, be connected to the earth terminal of pcb board by FPC again.
3., as claimed in claim 2 for the esd protection structure of COG liquid crystal display, it is characterized in that described FPC is connected to the earth terminal of pcb board in F pcb board edge.
4., as claimed in claim 1 for the esd protection structure of COG liquid crystal display, it is characterized in that described ESD line, it is that 0.2-2mm is thick.
5., as claimed in claim 1 for the esd protection structure of COG liquid crystal display, it is characterized in that described ESD line, be connected to the metal frame of COG liquid crystal display and the contact pad of pcb board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520040134.6U CN204331212U (en) | 2015-01-20 | 2015-01-20 | A kind of esd protection structure for COG liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520040134.6U CN204331212U (en) | 2015-01-20 | 2015-01-20 | A kind of esd protection structure for COG liquid crystal display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204331212U true CN204331212U (en) | 2015-05-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520040134.6U Expired - Fee Related CN204331212U (en) | 2015-01-20 | 2015-01-20 | A kind of esd protection structure for COG liquid crystal display |
Country Status (1)
| Country | Link |
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| CN (1) | CN204331212U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105573557A (en) * | 2016-02-02 | 2016-05-11 | 武汉华星光电技术有限公司 | Touch display panel and touch display device |
| CN106444181A (en) * | 2016-10-27 | 2017-02-22 | 南京华日触控显示科技有限公司 | Method for enhancing the electrostatic discharge defense ability by super twisted nematic liquid crystal display screen |
| CN106773192A (en) * | 2016-12-16 | 2017-05-31 | 河源耀国电子科技有限公司 | The electrostatic prevention structure and its method of LCDs |
-
2015
- 2015-01-20 CN CN201520040134.6U patent/CN204331212U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105573557A (en) * | 2016-02-02 | 2016-05-11 | 武汉华星光电技术有限公司 | Touch display panel and touch display device |
| CN105573557B (en) * | 2016-02-02 | 2018-12-21 | 武汉华星光电技术有限公司 | Touch-control display panel and touch control display apparatus |
| CN106444181A (en) * | 2016-10-27 | 2017-02-22 | 南京华日触控显示科技有限公司 | Method for enhancing the electrostatic discharge defense ability by super twisted nematic liquid crystal display screen |
| CN106773192A (en) * | 2016-12-16 | 2017-05-31 | 河源耀国电子科技有限公司 | The electrostatic prevention structure and its method of LCDs |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190103 Address after: 343600 No. 33 Workshop of Tianjin Photoelectric Industrial Park, Jinggangshan Economic and Technological Development Zone, Ji'an City, Jiangxi Province Patentee after: Jiangxi Jingruitong Technology Co.,Ltd. Address before: 518000 R&D Center, 71-7 Xintian Avenue, Fuyong Street, Baoan District, Shenzhen City, Guangdong Province, 4-6 Floor Patentee before: SHENZHEN WELLSTART INDUSTRIAL Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150513 |
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| CF01 | Termination of patent right due to non-payment of annual fee |