CN105388648A - Liquid crystal display and discharging circuit thereof - Google Patents
Liquid crystal display and discharging circuit thereof Download PDFInfo
- Publication number
- CN105388648A CN105388648A CN201510995898.5A CN201510995898A CN105388648A CN 105388648 A CN105388648 A CN 105388648A CN 201510995898 A CN201510995898 A CN 201510995898A CN 105388648 A CN105388648 A CN 105388648A
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- Prior art keywords
- tft device
- liquid crystal
- crystal display
- tft
- electrically connected
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136204—Arrangements to prevent high voltage or static electricity failures
Abstract
The invention discloses a liquid crystal display and a discharging circuit thereof. The discharging circuit comprises a pixel capacitor, a first ESD protection device, a first TFT device, a second TFT device, a control chip and a Source line. A first I/O pin of the control chip is electrically connected with a grid of the first TFT device, a second I/O pin is electrically connected with the grid of the second TFT device, a drain electrode of the first TFT device, a drain electrode of the second TFT device and one end of the first ESD protection device are all electrically connected with the Source line, so that residual charge on the power-off Source line can be completely released through the added TFT device, the releasing speed of the residual charge is accelerated, the ESD protection capacity of the liquid display is not affected, and the liquid crystal display and the discharging circuit thereof are simple in structure and convenient to control.
Description
Technical field
The present invention relates to field of liquid crystal, particularly a kind of liquid crystal display and discharge circuit thereof.
Background technology
In prior art; the discharge circuit of liquid crystal display as shown in Figure 1; comprise pixel capacitance 11, an ESD (Electro-StaticDischarge; Electro-static Driven Comb) protection device 12, Source line 13, TFT (ThinFilmTransistor, thin film transistor (TFT)) device T1, TFT device T3, testing weld pad 14, second ESD protective device 15 and control chip (not shown).Wherein, the I/O pin Pin1 of control chip is connected with the grid of TFT device T1, and the I/O pin Pin3 of control chip is connected with the grid of TFT device T3.
In the moment of liquid crystal display power down, electric charge through TFT device T1 to Source line, and carries out the release of electric charge by following two paths: path one, by Source line through the first ESD protective device to common port COM; Path two, by Source line through TFT device T3, testing weld pad, the second ESD protective device to common port COM.The experiment proved that, the electric charge discharged by path one is much larger than the electric charge discharged by path two.Therefore, path one is the predominating path of release residual charge.
But the first ESD protective device on path one can make discharge time longer, therefore cause electric charge to be evacuated not exclusively, and residual electric charge can cause the problems such as Flicker (i.e. the flicker level of the picture) drift of module.If reduce by the first ESD protective device, discharge time can shorten, and electric charge is evacuated also more complete simultaneously, but can affect the ESD protection capability of liquid crystal display.
Summary of the invention
The technical problem to be solved in the present invention is the defect that residual charge in order to exist when overcoming liquid crystal display power down in prior art can cause film flicker degree drift etc., a kind of release rate can accelerating residual charge is provided, and does not affect liquid crystal display and the discharge circuit thereof of ESD protection capability.
The present invention solves above-mentioned technical matters by following technical proposals:
A discharge circuit for liquid crystal display, its feature is, comprises pixel capacitance, the first ESD protective device, a TFT device, the 2nd TFT device, control chip and Source line,
One I/O pin of described control chip is electrically connected with the grid of a described TFT device; 2nd I/O pin of described control chip is electrically connected with the grid of described 2nd TFT device; the drain electrode of a described TFT device, the drain electrode of described 2nd TFT device and one end of described first ESD protective device are all electrically connected with described Source line; the source electrode of a described TFT device is electrically connected with described pixel capacitance, and the source electrode of described 2nd TFT device and the other end of described first ESD protective device are all electrically connected with common port.
In this programme, when liquid crystal display powers on, control chip controls the output level of an I/O pin, makes a TFT break-over of device, and Source line passes through a TFT device to pixel capacitance charges; When liquid crystal display power down, control chip controls the output level of an I/O pin and the 2nd I/O pin respectively, one TFT device is disconnected and the 2nd TFT break-over of device, and the electric charge on Source line is discharged by the path of the 2nd TFT device to common port.
In this programme, by increasing TFT device between Source line and common port, and by the control of control chip to TFT device break-make, residual charge after making power down on Source line can be discharged completely by the TFT device increased, both the release rate of residual charge had been accelerated, can not affect again the ESD protection capability of liquid crystal display, structure is simple, convenient control.
Preferably, described discharge circuit also comprises the 3rd TFT device and testing weld pad, 3rd I/O pin of described control chip is electrically connected with the grid of described 3rd TFT device, the source electrode of described 3rd TFT device is electrically connected with the drain electrode of a described TFT device, between the drain electrode that described testing weld pad is series at described 3rd TFT device and described common port.
In this programme, before the liquid-crystalline glasses of liquid crystal display does not bind drive IC (IntegratedCircuit), factory in order to the display of testing liquid crystal display whether normal, testing weld pad can be reserved in the both sides, binding region of the drive IC of liquid-crystalline glasses, and by the conduction acupuncture needle connecting test pad of unit clamp, control chip controls the output level of the 3rd I/O pin, makes the 3rd TFT break-over of device and driving liquid crystal displays, looks effect with the display of detection LCD monitor.After drive IC binding, control chip controls the output level of the 3rd I/O pin, and the 3rd TFT device is disconnected.
Preferably, described discharge circuit also comprises the second ESD protective device, is series between described testing weld pad and described common port.
Preferably, described first ESD protective device and described second ESD protective device include the diode of at least one group of reverse parallel connection.
The present invention also provides a kind of liquid crystal display, and its feature is, comprises discharge circuit as above.
Preferably, described liquid crystal display is TFT LCD, TN (TwistedNematic, twisted nematic) liquid crystal display, STN (SuperTN, super-twist nematic) liquid crystal display or DSTN (DualScanTortuosityNomograph, double-layer super-twist nematic) liquid crystal display.
On the basis meeting this area general knowledge, above-mentioned each optimum condition, can combination in any, obtains the preferred embodiments of the invention.
Positive progressive effect of the present invention is: the present invention by increasing TFT device between Source line and common port, and by the control of control chip to TFT device break-make, residual charge after making power down on Source line can be discharged completely by the TFT device increased, both the release rate of residual charge had been accelerated, the ESD protection capability of liquid crystal display can not be affected again, structure is simple, convenient control.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the discharge circuit of liquid crystal display in prior art.
Fig. 2 is the theory diagram of the discharge circuit of the liquid crystal display of the embodiment of the present invention 1.
Fig. 3 is the theory diagram of the discharge circuit of the liquid crystal display of the embodiment of the present invention 2.
Embodiment
Mode below by embodiment further illustrates the present invention, but does not therefore limit the present invention among described scope of embodiments.
Embodiment 1
The present embodiment provides a kind of discharge circuit of liquid crystal display, as shown in Figure 2, comprises pixel capacitance 11, first ESD protective device 12, a TFT device T1, the 2nd TFT device T2, control chip (not shown) and Source line 13,
The I/O pin Pin1 of described control chip is electrically connected with the grid of a TFT device T1; the I/O pin Pin2 of described control chip is electrically connected with the grid of the 2nd TFT device T2; the drain electrode of the one TFT device T1, the drain electrode of the 2nd TFT device T2 and one end of the first ESD protective device 12 are all electrically connected with Source line 13; the source electrode of the one TFT device T1 is electrically connected with pixel capacitance 11, and the source electrode of the 2nd TFT device T2 and the other end of the first ESD protective device 12 are all electrically connected with common port COM.
In the present embodiment, when liquid crystal display powers on, the output level of control chip control I/O pin Pin1, makes a TFT device T1 conducting, and Source line passes through a TFT device T1 to pixel capacitance charges; When liquid crystal display power down, the output level of control chip control I/O pin Pin1 and I/O pin Pin2 respectively, one TFT device T1 is disconnected and the 2nd TFT device T2 conducting, and the electric charge on Source line discharges to the path of common port mainly through the 2nd TFT device T2.
In the present embodiment, by increasing by the 2nd TFT device T2 between Source line and common port, and by the control of control chip to the 2nd TFT device T2 break-make, residual charge after making power down on Source line can be discharged completely by the 2nd TFT device T2 increased, add the release way of residual charge, both accelerated the release rate of residual charge, the ESD protection capability of liquid crystal display can not be affected again, structure is simple, convenient control.
Embodiment 2
The present embodiment provides a kind of discharge circuit of liquid crystal display, as shown in Figure 3, is with the difference of the discharge circuit of liquid crystal display in embodiment 1:
(1) discharge circuit of the present embodiment has increased the 3rd TFT device T3, testing weld pad 14 and the second ESD protective device 15 newly, the I/O pin Pin3 of described control chip is electrically connected with the grid of the 3rd TFT device T3, the source electrode of the 3rd TFT device T3 is electrically connected with the drain electrode of a TFT device T1, between the drain electrode that testing weld pad 14 is series at the 3rd TFT device T3 and common port COM, the second ESD protective device 15 is series between testing weld pad 14 and common port COM;
(2), in the discharge circuit of the present embodiment, the first ESD protective device 12 comprises the diode of two groups of reverse parallel connections, and the second ESD protective device 15 comprises the diode of one group of reverse parallel connection.
The present embodiment also provides a kind of liquid crystal display, comprises the present embodiment discharge circuit as above.
In the present embodiment, liquid crystal display is TFT LCD, TN liquid crystal display, stn liquid crystal display or DSTN liquid crystal display.
Give a concrete illustration the principle of work of the discharge circuit that liquid crystal display in the present embodiment is described below.
When liquid crystal display powers on, control chip control I/O pin Pin1 exports high level, now a TFT device T1 conducting, and Source line passes through a TFT device T1 to pixel capacitance charges; When liquid crystal display power down, control chip control I/O pin Pin1 output low level, control I/O pin Pin2 exports high level and maintains high level 16ms, now a TFT device T1 disconnects and the 2nd TFT device T2 conducting, and the electric charge on Source line discharges to the path of common port mainly through the 2nd TFT device T2.Wherein, before the liquid-crystalline glasses of liquid crystal display does not bind drive IC, the output level of control chip control I/O pin Pin3, makes the 3rd TFT device T3 conducting and driving liquid crystal displays, looks effect with the display of detection LCD monitor; After drive IC binding, the output level of control chip control I/O pin Pin3, makes the 3rd TFT device T3 disconnect.
In addition, the time that control chip control I/O pin Pin2 maintains high level can carry out software design patterns according to actual conditions, such as according to the setting such as the size of residual charge and the wire width of discharge path on Source line, the 16ms in above-mentioned example can be not limited to.
It should be noted that the output level of control chip I/O pin and the corresponding relation of TFT device break-make can be arranged according to actual conditions, such as, can arrange according to the self structure of TFT device (N raceway groove or P raceway groove).
In the present embodiment, by on the basis of existing discharge circuit, increase the release way of electric charge on Source line, particularly, by increasing by the 2nd TFT device T2 between Source line and common port, residual charge is fully discharged to the path of common port by the 2nd TFT device T2, also can not impact the ESD protection capability of liquid crystal display simultaneously.In addition, the discharge circuit structure of the present embodiment is simple, convenient control.
Although the foregoing describe the specific embodiment of the present invention, it will be understood by those of skill in the art that these only illustrate, protection scope of the present invention is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, can make various changes or modifications to these embodiments, but these change and amendment all falls into protection scope of the present invention.
Claims (6)
1. a discharge circuit for liquid crystal display, is characterized in that, comprises pixel capacitance, the first ESD protective device, a TFT device, the 2nd TFT device, control chip and Source line,
One I/O pin of described control chip is electrically connected with the grid of a described TFT device; 2nd I/O pin of described control chip is electrically connected with the grid of described 2nd TFT device; the drain electrode of a described TFT device, the drain electrode of described 2nd TFT device and one end of described first ESD protective device are all electrically connected with described Source line; the source electrode of a described TFT device is electrically connected with described pixel capacitance, and the source electrode of described 2nd TFT device and the other end of described first ESD protective device are all electrically connected with common port.
2. discharge circuit as claimed in claim 1, it is characterized in that, described discharge circuit also comprises the 3rd TFT device and testing weld pad, 3rd I/O pin of described control chip is electrically connected with the grid of described 3rd TFT device, the source electrode of described 3rd TFT device is electrically connected with the drain electrode of a described TFT device, between the drain electrode that described testing weld pad is series at described 3rd TFT device and described common port.
3. discharge circuit as claimed in claim 2, it is characterized in that, described discharge circuit also comprises the second ESD protective device, is series between described testing weld pad and described common port.
4. discharge circuit as claimed in claim 3, it is characterized in that, described first ESD protective device and described second ESD protective device include the diode of at least one group of reverse parallel connection.
5. a liquid crystal display, is characterized in that, comprises the discharge circuit according to any one of Claims 1 to 4.
6. liquid crystal display as claimed in claim 5, it is characterized in that, described liquid crystal display is TFT LCD, TN liquid crystal display, stn liquid crystal display or DSTN liquid crystal display.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510995898.5A CN105388648B (en) | 2015-12-25 | 2015-12-25 | Liquid crystal display and its discharge circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510995898.5A CN105388648B (en) | 2015-12-25 | 2015-12-25 | Liquid crystal display and its discharge circuit |
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| CN105388648A true CN105388648A (en) | 2016-03-09 |
| CN105388648B CN105388648B (en) | 2018-10-12 |
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Cited By (6)
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| CN106959562A (en) * | 2017-05-09 | 2017-07-18 | 惠科股份有限公司 | A kind of display panel |
| CN107658856A (en) * | 2017-10-30 | 2018-02-02 | 睿力集成电路有限公司 | A kind of electrostatic discharge protective circuit and IC chip |
| CN107910858A (en) * | 2017-12-07 | 2018-04-13 | 睿力集成电路有限公司 | Low voltage electrostatic protection circuit, chip circuit and its electrostatic protection method |
| CN108681116A (en) * | 2018-05-21 | 2018-10-19 | 京东方科技集团股份有限公司 | A kind of display panel, detection jig and detection control method |
| WO2018214645A1 (en) * | 2017-05-22 | 2018-11-29 | 京东方科技集团股份有限公司 | Array substrate and method for manufacturing same, and display device |
| CN109192152A (en) * | 2018-08-29 | 2019-01-11 | 努比亚技术有限公司 | A kind of LCD control circuit and terminal |
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| CN107910858A (en) * | 2017-12-07 | 2018-04-13 | 睿力集成电路有限公司 | Low voltage electrostatic protection circuit, chip circuit and its electrostatic protection method |
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| CN108681116A (en) * | 2018-05-21 | 2018-10-19 | 京东方科技集团股份有限公司 | A kind of display panel, detection jig and detection control method |
| CN108681116B (en) * | 2018-05-21 | 2021-02-26 | 京东方科技集团股份有限公司 | Display panel, detection jig and detection control method |
| CN109192152A (en) * | 2018-08-29 | 2019-01-11 | 努比亚技术有限公司 | A kind of LCD control circuit and terminal |
| CN109192152B (en) * | 2018-08-29 | 2021-01-01 | 努比亚技术有限公司 | LCD control circuit and terminal |
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