CN100399133C - LCD panel protective circuit and LCD - Google Patents
LCD panel protective circuit and LCD Download PDFInfo
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- CN100399133C CN100399133C CNB2004100397027A CN200410039702A CN100399133C CN 100399133 C CN100399133 C CN 100399133C CN B2004100397027 A CNB2004100397027 A CN B2004100397027A CN 200410039702 A CN200410039702 A CN 200410039702A CN 100399133 C CN100399133 C CN 100399133C
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- 230000001681 protective effect Effects 0.000 title claims abstract description 14
- 230000002457 bidirectional effect Effects 0.000 claims 16
- 239000004973 liquid crystal related substance Substances 0.000 abstract description 10
- 239000010409 thin film Substances 0.000 description 12
- 230000006378 damage Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000007600 charging Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
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Abstract
The present invention relates to a protective circuit of a liquid crystal display panel, which is suitable for the liquid crystal display panel. The liquid crystal display panel comprises a plurality of display units, wherein the display units are respectively connected among a data electrode, a grid electrode and a common electrode; a switch device is provided with a first end and a second end connected with the data electrode or the grid electrode at least. When the electric level of the first end or the electric level of the second end exceeds the electric level of threshold voltage, the switch device is conducted. An electrostatic discharge protecting device is connected between the second end of the switch device and the common electrode, and has capacitive loads and resistive loads.
Description
Technical field
The present invention is relevant for a kind of LCD and holding circuit thereof, particularly relevant for a kind of LCD panel holding circuit and LCD with Electrostatic Discharge protection circuit.
Background technology
At present conventional LCD comprised a plurality of pixels (pixel) of lining up the array shape, the voltage that applies that the liquid crystal in each pixel is subjected on it is controlled, and can change the transmissivity of liquid crystal, to show required gray scale on the screen.
Fig. 1 represents the schematic equivalent circuit of conventional LCD panel (liquid crystal display panel is hereinafter to be referred as the LCD panel) and peripheral drive circuit thereof.As shown in the figure, on the LCD panel 1 be by crisscross data electrode (with D1, D2 ... Dm represents) with gate electrode (with G1, G2 ... Gn represents) be interwoven, staggered data electrode and the gate electrode of each group can be used for controlling a display unit (display unit), and for example data electrode D1 and gate electrode G1 can be used for controlling display unit 100.As shown in the figure, the equivalent electrical circuit of each display unit mainly comprise control data enter the thin film transistor (TFT) of usefulness (Q11-Q1m, Q21-Q2m ..., Qn1-Qnm) and memory capacitance (C11-C1m, C21-C2m ..., Cn1-Cnm).The grid of thin film transistor (TFT) is connected gate electrode (G1-Gn) and data electrode (D1-Dm) respectively with drain electrode, by the sweep signal on the gate electrode (G1-Gn), can conducting turn-off all thin film transistor (TFT)s in the same delegation (that is same sweep trace), whether can be written in the corresponding display unit with the vision signal (video signal) on this control data electrode (D1-Dm).And memory capacitance to be connected to corresponding thin film transistor (TFT) and voltage level be the common electrode 14 of common electrode voltage VCOM.
In addition, in Fig. 1, express the driving circuit section of LCD panel 1 simultaneously.Gate drivers (gate driver) 10 be according to set scanning sequency, send each gate electrode G1, G2 ..., the sweep signal on the Gn.When being loaded with sweep signal on a certain gate electrode, can make with being conducting state in the delegation or with the thin film transistor (TFT) in online all display units of one scan.When a certain sweep trace was selected, data driver 12 was according to view data to be shown, via data electrode D1, D2 ... Dm, send corresponding vision signal to m display unit of these row.After gate drivers 10 is finished once the online scan operation of all n line scannings, i.e. the display operation of single frame (frame) is finished in expression.Therefore, each sweep trace of multiple scanning and send vision signal just can reach the purpose of continuous display image.Wherein, signal CTR represents the scan control information that gate drivers 10 is received; Signal LD represents data latching (latch) signal of data driver 12, and signal DATA then represents input image information.
Generally data electrode D1, D2 ..., the vision signal that transmitted on the Dm, relation according to using together between the electrode voltage VCOM can be divided into two kinds of positive video signal (positive video signal) and negative video signals (negative video signal).Positive video signal is meant that its current potential is higher than common electrode voltage VCOM, and has corresponding voltage level, general healing near common electrode voltage VCOM person corresponding to lower gray-scale value according to the gray-scale value difference of its representative.Relatively, negative video signal is meant that its current potential is lower than common electrode voltage VCOM, and has corresponding voltage level according to the gray-scale value difference of its representative.Similarly, heal near common electrode voltage VCOM person corresponding to lower gray-scale value.When same gray-scale value was represented with positive video signal and negative video signal respectively, display effect was the same in principle, but some difference in fact still.In addition, be subjected to single polarity electric field bias constantly, cause the liquid crystal molecule life-span to shorten, so the single display unit can receive the vision signal of opposite polarity respectively when odd-numbered frame and even frame in order to prevent liquid crystal molecule.
In the manufacture process of LCD panel, the glass substrate of insulation exists the problem that static discharge disturbs.The existence of static discharge can cause the impaired of LCD panel circuit.Therefore, in the design of circuit, the design that must add buffering ESD voltage just can be avoided the destruction of ESD.
United States Patent (USP) numbering 6,175,394 discloses a kind of LCD panel of the ESD of having protection circuit.The ESD protection circuit is connected between gate electrode or data electrode and the protective ring, and it is the thin film transistor (TFT) of a grid suspension joint.
United States Patent (USP) numbering 6,493,047 discloses a kind of LCD panel of the ESD of having protection circuit.The control end that the ESD protection circuit has a switchgear and is coupled to switchgear is connected between gate electrode or data electrode and the common electrode.
Conventional art is to add the design of a short-circuited conducting sleeve 15 (short ring), so that the ESD electric current is released into common electrode 14 via short-circuited conducting sleeve between the gate electrode and data electrode and common electrode 14 of LCD panel.
Fig. 2 is the circuit diagram that shows traditional short-circuited conducting sleeve 15.Short-circuited conducting sleeve comprises positive terminal and negative pole end two diodes 16 and 18 that join inverting each other, and the tie point of the positive terminal of diode 16 and 18 and negative pole end is connected to gate electrode (G1-Gn) and data electrode (D1-Dm) leads on the circuit paths of display unit 100 and between the common electrode 14.When the voltage level of gate electrode (G1-Gn) or data electrode (D1-Dm) surpasses the forward voltage of diode 16 because ESD intensifies, then diode 16 conductings, so the ESD electric current of gate electrode (G1-Gn) or data electrode (D1-Dm) flow to common electrode 14 via the diode 16 of conducting.Because the volume of common electrode 14 is bigger, is enough to bear described ESD electric current, therefore can avoid display unit 100 to be subjected to the destruction of ESD electric current, reach the purpose that ESD protects.
Yet in the manufacture process of LCD panel, the source of esd event also may take place in common electrode 14.When esd event took place on common electrode 14, a large amount of ESD electric currents flow to display unit 100 with conducting diode 18, and therefore traditional short-circuited conducting sleeve 15 and can't preventing is originated and is the esd event of the common electrode destruction to display unit.In addition, conventional art is considered as common electrode 14 electrical ground, yet in fact common electrode itself is also unearthed, and therefore the magnitude of current that can load is limited, when the ESD electric current is big, the danger of re-injection to other signal circuit is arranged.
Summary of the invention
In view of this, in order to solve described problem, fundamental purpose of the present invention is to provide a kind of LCD panel protection circuit, and a buffer circuit is set between short-circuited conducting sleeve and common electrode, can slow down the influence that esd event changes the display unit circuit level.
For realizing described purpose, the present invention proposes a kind of LCD panel holding circuit, is suitable for LCD panel.LCD panel comprises display unit, is connected between data electrode, gate electrode and the common electrode.Switchgear, have be connected to data electrode with gate electrode at least one first end, and second end, when the level of one in first end and second end surpasses threshold voltage levels, then switchgear conducting.Electrostatic discharge protective device is connected between second end and common electrode of switchgear, has capacity load and resistive load.
Moreover the present invention proposes a kind of LCD.LCD panel comprises a plurality of display units, is connected between the corresponding a plurality of data electrodes and a plurality of gate electrode and common electrode.Gate drivers is in order to send sweep signal to gate electrode.Data driver in order to outputting video signal to data electrode.A plurality of switchgears have first end that is connected to corresponding data electrode respectively, and second end, when the level of one in first end and second end surpasses threshold voltage levels, and then switchgear conducting.Electrostatic discharge protective device is connected between second end and common electrode of switchgear, has capacity load and resistive load.
Description of drawings
For described purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail as follows:
Fig. 1 represents the schematic equivalent circuit of conventional tft liquid crystal display board and peripheral drive circuit thereof.
Fig. 2 is the circuit diagram of the traditional short-circuited conducting sleeve of expression.
Fig. 3 is the schematic equivalent circuit of expression according to the described LCD of the embodiment of the invention.
Fig. 4 is the circuit diagram of expression according to described switchgear 26,27 of the embodiment of the invention and ESD protection circuit 28.
Symbol description:
1,3-LCD panel
10,20-gate drivers
12,22-data driver
14,24～common electrode
15～short-circuited conducting sleeve
26,27～switchgear
16,18,261,262～diode
28～ESD protection circuit
100,200-display unit
281～resistive load
282～capacity load
2611,2621～positive terminal
2612,2622～negative pole end
A～first end
B～second end
C11-C1m, C21-C2m ..., Cn1-Cnm～memory capacitance
D1, D2 ... Dm～data electrode
G1, G2 ... Gn～gate electrode
Q11-Q1m, Q21-Q2m ..., Qn1-Qnm～thin film transistor (TFT)
VCOM～common electrode voltage
Embodiment
Embodiment:
Fig. 3 is the schematic equivalent circuit of expression according to the described LCD of the embodiment of the invention.As shown in the figure, LCD panel 3 be by crisscross data electrode (with D1, D2 ... Dm represents) with gate electrode (with G1, G2 ... Gn represents) be interwoven, staggered data electrode and the gate electrode of each group can be used for controlling a display unit (display unit), and for example data electrode D1 and gate electrode G1 can be used for controlling display unit 200.As shown in the figure, the equivalent electrical circuit of each display unit mainly comprise control data enter the thin film transistor (TFT) of usefulness (Q11-Q1m, Q21-Q2m ..., Qn1-Qnm) and memory capacitance (C11-C1m, C21-C2m ..., Cn1-Cnm).The grid of thin film transistor (TFT) is connected gate electrode (G1-Gn) and data electrode (D1-Dm) respectively with drain electrode, by the sweep signal on the gate electrode (G1-Gn), can conducting turn-off all thin film transistor (TFT)s in the same delegation (that is same sweep trace), whether can be written in the corresponding display unit with the vision signal (video signal) on this control data electrode (D1-Dm).And memory capacitance to be connected to corresponding thin film transistor (TFT) and voltage level be the common electrode 24 of common electrode voltage VCOM.
In addition, in Fig. 3, express the driving circuit section of LCD panel 3 simultaneously.Gate drivers (gate driver) the 20th, according to set scanning sequency, send each gate electrode G1, G2 ..., the sweep signal on the Gn.When being loaded with sweep signal on a certain gate electrode, can make with being conducting state in the delegation or with the thin film transistor (TFT) in online all display units of one scan.When a certain sweep trace was selected, data driver 22 was according to view data to be shown, via data electrode D1, D2 ... Dm, send corresponding vision signal to m display unit of these row.After gate drivers 20 is finished once the online scan operation of all n column scans, i.e. the display operation of single frame (frame) is finished in expression.Therefore, each sweep trace of multiple scanning and send vision signal just can reach the purpose of continuous display image.Wherein, signal CTR represents the scan control information that gate drivers 20 is received; Signal LD represents data latching (latch) signal of data driver 22, and signal DATA then represents input image information.
In order to prevent in the ESD of data electrode, gate electrode or common electrode electric current to the damage that display unit caused, LCD according to the present invention in common electrode and data electrode with and gate electrode between added the design of switchgear (traditional short-circuited conducting sleeve) 26,27 and ESD protection circuit 28.
Fig. 4 is the circuit diagram of expression according to described switchgear 26,27 of the embodiment of the invention and ESD protection circuit 28.Switchgear 26 has the first end A and the one second end B that is connected to each data electrode (D1-Dm) and gate electrode (G1-Gn), and switchgear 27 (master switch device) is connected between each switchgear 26 and the ESD protection circuit 28.According to the embodiment of the invention, switchgear 26 is identical with 27 circuit structure, is all a two-way current-limiting apparatus, comprises diode 261 and 262.
The positive terminal 2611 of diode 261 is connected to the negative pole end 2622 of diode 262, and the negative pole end 2612 of diode 261 is connected to the positive terminal 2621 of diode 262.The positive terminal 2611 of diode 261 is the first end A with the tie point of the negative pole end 2622 of diode 262, and the tie point of the positive terminal 2621 of the negative pole end 2612 of diode 261 and diode 262 is the second end B.The first end A and the second end B are connected to gate electrode (G1-Gn) and data electrode (D1-Dm) leads on the circuit paths of display unit 200 and between the ESD protection circuit 28.
After positive terminal 2611,2621 voltage levels that received of diode 261 and 262 1 surpassed the threshold voltage of diode, then diode 261 or 262 will conducting.In addition, ESD protection circuit 28 comprises parallel resistor load 281 and capacity load 282, is connected between switchgear 27 and the common electrode 24.
When esd pulse appears at data electrode (D1-Dm), gate electrode (G1-Gn) or common electrode 24, on the current path that switchgear 26,27 and ESD protection circuit 28 are constituted, esd pulse can be earlier to capacity load 282 chargings, therefore the current path that only has small part ESD electric current to be constituted by switchgear 26,27 and ESD protection circuit 28 via resistive load 281, subsequently capacity load 282 again slow release be stored in this energy.Therefore, when esd pulse appears at common electrode 24, can prolong esd pulse enters display unit 200 via data electrode or gate electrode time, effectively reduce the moment ESD magnitude of current that enters display unit 200 and data electrode or gate electrode, reached the peripheral driving circuit of protective liquid crystal display 3 and the purpose of inner display unit.Moreover, when if esd pulse appears at data electrode (D1-Dm) or gate electrode (G1-Gn), esd pulse can be released into common electrode 24 via the current path that switchgear 26,27 and ESD protection circuit 28 are constituted equally, has the ESD protection effect identical with conventional art.
Moreover, if esd pulse is excessive, may cause capacity load 282 to damage, this moment, LCD panel still can continue operation, but ESD protection circuit 28 may lose the ESD safeguard function, so circuit designers need design the capacity load of suitable ESD ability to bear.
Moreover, when LCD panel is carried out general operation, because the level of common electrode 24 is kept a fixed voltage, under the situation of fixing DC level, the effect of capacity load is not obvious, the usefulness in the time of therefore can not having influence on LCD panel 3 and carry out general operations.
According to the described ESD protection circuit of the embodiment of the invention, moment ESD electric current in the time of can avoiding esd event takes place or ESD change in voltage are to the impact of internal circuit, and no matter esd event betides data electrode (D1-Dm) or gate electrode (G1-Gn), or common electrode 24, all have the effect that ESD protects, effectively solved the problem of conventional art.In addition, employed protection circuit in the embodiment of the invention, not needing on the implementation increases too many assembly, is very suitable for the utilization of industry.
In sum; though the present invention with a preferred embodiment openly as above; right its is not in order to limit the present invention; any those skilled in the art; under the situation that does not break away from the spirit and scope of the present invention; can carry out various changes and modification, so protection scope of the present invention is as the criterion when looking the claim restricted portion that is proposed.
Claims (14)
1. a LCD panel holding circuit is suitable for a LCD panel, and described LCD panel comprises a display unit, is connected a data electrode, a gate electrode and has altogether to use between the electrode, and described LCD panel holding circuit comprises:
One two-way current-limiting apparatus, have be connected to described data electrode with gate electrode at least one one first end, and one second end, when the level of one in described first end and second end surpasses a threshold voltage levels, the conducting of then described bidirectional current limiting device; And
One electrostatic discharge protective device is connected between second end and described common electrode of described bidirectional current limiting device, and this electrostatic discharge protective device has capacity load and resistive load in parallel.
2. LCD panel holding circuit as claimed in claim 1, wherein said bidirectional current limiting device comprises:
One first diode has one first positive terminal and one first negative pole end; And
One second diode, have second negative pole end that is connected to described one first positive terminal and second positive terminal that is connected to described first negative pole end, the tie point of wherein said first positive terminal and second negative pole end is described first end, and the tie point of described first negative pole end and second positive terminal is described second end.
3. LCD panel holding circuit as claimed in claim 1, wherein said capacity load are connected between described bidirectional current limiting device and the described common electrode.
4. LCD panel holding circuit as claimed in claim 3, wherein said resistive load is connected to the two ends of described capacity load.
5. LCD comprises:
One LCD panel comprises a plurality of display units, is connected to corresponding a plurality of data electrodes and a plurality of gate electrode and uses between the electrode altogether;
One gate drivers is in order to send sweep signal to described gate electrode;
One data driver, in order to outputting video signal to described data electrode;
A plurality of bidirectional current limiting devices have one first end that is connected to corresponding described data electrode respectively, and one second end, when the level of one in described first end and second end surpasses a threshold voltage levels, and the conducting of then described bidirectional current limiting device; And
One electrostatic discharge protective device is connected between second end and described common electrode of described bidirectional current limiting device, and this electrostatic discharge protective device has capacity load and resistive load in parallel.
6. LCD as claimed in claim 5, wherein said bidirectional current limiting device comprises:
One first diode has one first positive terminal and one first negative pole end; And
One second diode, have second negative pole end that is connected to described one first positive terminal and second positive terminal that is connected to described first negative pole end, the tie point of wherein said first positive terminal and second negative pole end is described first end, and the tie point of described first negative pole end and second positive terminal is described second end.
7. LCD as claimed in claim 5 also comprises a master switch device, is connected between second end and described electrostatic discharge protective device of described bidirectional current limiting device.
8. LCD as claimed in claim 5, wherein said capacity load are connected between described bidirectional current limiting device and the described common electrode.
9. LCD as claimed in claim 8, wherein said resistive load is connected to the two ends of described capacity load.
10. LCD comprises:
One LCD panel comprises a plurality of display units, connects corresponding a plurality of data electrodes and a plurality of gate electrode respectively and uses between the electrode altogether;
One gate drivers is in order to send sweep signal to described gate electrode;
One data driver, in order to outputting video signal to described data electrode;
A plurality of bidirectional current limiting devices, have respectively be connected to corresponding described data electrode with one first end of gate electrode, and one second end, when the level of one in described first end and second end surpasses a threshold voltage levels, the conducting of then described bidirectional current limiting device; And
One electrostatic discharge protective device is connected between second end and described common electrode of described bidirectional current limiting device, and this electrostatic discharge protective device comprises capacity load and resistive load in parallel.
11. LCD as claimed in claim 10, wherein said bidirectional current limiting device comprises:
One first diode has one first positive terminal and one first negative pole end; And
One second diode, have second negative pole end that is connected to described one first positive terminal and second positive terminal that is connected to described first negative pole end, the tie point of wherein said first positive terminal and second negative pole end is described first end, and the tie point of described first negative pole end and second positive terminal is described second end.
12. LCD as claimed in claim 10 also comprises a master switch device, is connected between second end and described electrostatic discharge protective device of described bidirectional current limiting device.
13. LCD as claimed in claim 10, wherein said capacity load are connected between described bidirectional current limiting device and the described common electrode.
14. LCD as claimed in claim 10, wherein said resistive load is connected to the two ends of described capacity load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100397027A CN100399133C (en) | 2004-03-15 | 2004-03-15 | LCD panel protective circuit and LCD |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100397027A CN100399133C (en) | 2004-03-15 | 2004-03-15 | LCD panel protective circuit and LCD |
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| CN1564060A CN1564060A (en) | 2005-01-12 |
| CN100399133C true CN100399133C (en) | 2008-07-02 |
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| CNB2004100397027A Expired - Fee Related CN100399133C (en) | 2004-03-15 | 2004-03-15 | LCD panel protective circuit and LCD |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8138781B2 (en) | 2008-09-23 | 2012-03-20 | Au Optronics (Suzhou) Corp., Ltd. | Test circuit adapted in a display panel of an electronic device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101197054B1 (en) * | 2005-11-14 | 2012-11-06 | 삼성디스플레이 주식회사 | Display device |
| KR20070119344A (en) * | 2006-06-15 | 2007-12-20 | 엘지.필립스 엘시디 주식회사 | Liquid crystal display device |
| CN100411005C (en) * | 2006-09-28 | 2008-08-13 | 友达光电股份有限公司 | Control circuit with static electricity prevention function and liquid crystal display device |
| WO2008087899A1 (en) * | 2007-01-15 | 2008-07-24 | Sharp Kabushiki Kaisha | Liquid crystal panel, liquid crystal display device and television image receiver |
| KR100805599B1 (en) * | 2007-03-16 | 2008-02-20 | 삼성에스디아이 주식회사 | Organic elcetroluminescence display and making method teherof |
| CN105182645B (en) * | 2015-10-12 | 2018-09-11 | 京东方科技集团股份有限公司 | Display base plate and preparation method thereof and display device |
| CN106940494B (en) * | 2017-05-12 | 2020-07-03 | 京东方科技集团股份有限公司 | Display mother board, electrostatic discharge method thereof and base station |
| CN108508644A (en) * | 2018-04-10 | 2018-09-07 | 上海贝思特电气有限公司 | A kind of display panel and display |
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| CN1564060A (en) | 2005-01-12 |
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