CN105388648B - Liquid crystal display and its discharge circuit - Google Patents
Liquid crystal display and its discharge circuit Download PDFInfo
- Publication number
- CN105388648B CN105388648B CN201510995898.5A CN201510995898A CN105388648B CN 105388648 B CN105388648 B CN 105388648B CN 201510995898 A CN201510995898 A CN 201510995898A CN 105388648 B CN105388648 B CN 105388648B
- Authority
- CN
- China
- Prior art keywords
- tft devices
- liquid crystal
- crystal display
- electrically connected
- tft
- Prior art date
- 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.)
- Active
Links
Classifications
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Semiconductor Integrated Circuits (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention discloses a kind of liquid crystal display and its discharge circuits; discharge circuit includes pixel capacitance, the first ESD protective device, the first TFT devices, the 2nd TFT devices, control chip, Source lines; first I/O pins of control chip are electrically connected with the grid of the first TFT devices; 2nd I/O pins are electrically connected with the grid of the 2nd TFT devices; one end of the drain electrode of first TFT devices, the drain electrode of the 2nd TFT devices and the first ESD protective device is electrically connected with Source lines, and the source electrode of the first TFT devices is electrically connected with pixel capacitance.The present invention between Source lines and common end by increasing TFT devices, residual charge after power down on Source lines is discharged completely by increased TFT devices, both the rate of release of residual charge had been accelerated, the ESD protection capability of liquid crystal display is not interfered with again, it is simple in structure, facilitate control.
Description
Technical field
The present invention relates to field of liquid crystal, more particularly to a kind of liquid crystal display and its discharge circuit.
Background technology
In the prior art, the discharge circuit of liquid crystal display is as shown in Figure 1, including pixel capacitance 11, the first ESD
(Electro-Static Discharge, Electro-static Driven Comb) protects device 12, Source lines 13, TFT (Thin Film
Transistor, thin film transistor (TFT)) device T1, TFT device T3, testing weld pad 14, the second ESD protective device 15 and control core
Piece (not shown).Wherein, the I/O pins Pin1 for controlling chip is connect with the grid of TFT devices T1, controls the I/O of chip
Pin Pin3 is connect with the grid of TFT devices T3.
In the moment of liquid crystal display power down, charge through TFT device T1 to Source lines, and by following two paths into
The release of row charge：Path one, by Source lines through the first ESD protective device to common end COM；Path two, by Source lines
Through TFT devices T3, testing weld pad, the second ESD protective device to common end COM.The experiment proved that the electricity that passage path one discharges
Lotus is much larger than the charge that passage path two discharges.Therefore, path one is the predominating path for discharging residual charge.
But the first ESD protective device on path one can so that discharge time is longer, therefore cause charge evacuation endless
Entirely, the problems such as remaining charge can cause the Flicker (i.e. the flicker level of picture) of module to drift about.If reducing by the first ESD
It protects device, discharge time that can shorten, while charge evacuation is also more complete, but the ESD protection of liquid crystal display can be influenced
Ability.
Invention content
Existing residual when the technical problem to be solved by the present invention is in order to overcome liquid crystal display power down in the prior art
Charge can lead to the defect of film flicker degree drift etc., provide a kind of rate of release that can accelerate residual charge, and not shadow
Ring the liquid crystal display and its discharge circuit of ESD protection capability.
The present invention is to solve above-mentioned technical problem by following technical proposals：
A kind of discharge circuit of liquid crystal display, feature are, including pixel capacitance, the first ESD protective device, first
TFT devices, the 2nd TFT devices, control chip and Source lines,
First I/O pins of the control chip are electrically connected with the grid of the first TFT devices, the control chip
2nd I/O pins are electrically connected with the grid of the 2nd TFT devices, the draining of the first TFT devices, the 2nd TFT devices
One end of the drain electrode of part and first ESD protective device is electrically connected with the Source lines, the first TFT devices
Source electrode is electrically connected with the pixel capacitance, the source electrode of the 2nd TFT devices and the other end of first ESD protective device
It is electrically connected with common end.
In the present solution, when liquid crystal display powers on, the output level of the first I/O pins of chip controls is controlled so that the
One TFT break-over of device, Source lines are by the first TFT devices to pixel capacitance charges；When liquid crystal display power down, core is controlled
Piece controls the output level of the first I/O pins and the 2nd I/O pins respectively so that the first TFT devices disconnect and the 2nd TFT devices
It is connected, the charge on Source lines is discharged by the path of the 2nd TFT devices to common end.
In the present solution, by increasing TFT devices between Source lines and common end, and by controlling chip to TFT
The control of device break-make so that the residual charge after power down on Source lines can completely be discharged by increased TFT devices, both
The rate of release of residual charge is accelerated, and does not interfere with the ESD protection capability of liquid crystal display, it is simple in structure, facilitate control.
Preferably, the discharge circuit further includes the 3rd TFT devices and testing weld pad, the 3rd I/O of the control chip
Pin is electrically connected with the grid of the 3rd TFT devices, the leakage of the source electrode and the first TFT devices of the 3rd TFT devices
Pole is electrically connected, and the testing weld pad is series between the drain electrode and the common end of the 3rd TFT devices.
In the present solution, liquid crystal display liquid-crystalline glasses do not bind driving IC (Integrated Circuit) it
Before, factory displays whether normally in order to testing liquid crystal display, can be pre- in the binding region both sides of the driving IC of liquid-crystalline glasses
Testing weld pad is stayed, and by the conductive acupuncture needle connecting test pad of special fixture, controls the output electricity of the 3rd I/O pins of chip controls
It is flat so that the 3rd TFT break-over of device simultaneously drives liquid crystal display, with the display visual effect of detection LCD monitor.When driving IC is tied up
After fixed, the output level of the 3rd I/O pins of chip controls is controlled so that the 3rd TFT devices disconnect.
Preferably, the discharge circuit further includes the second ESD protective device, be series at the testing weld pad with it is described public
Between end.
Preferably, first ESD protective device and second ESD protective device include at least one set of reverse parallel connection
Diode.
The present invention also provides a kind of liquid crystal display, feature is, including discharge circuit as described above.
Preferably, the liquid crystal display is TFT LCD, TN (Twisted Nematic, twisted nematic) liquid
Crystal display, STN (Super TN, super-twist nematic) liquid crystal displays or DSTN (Dual Scan Tortuosity
Nomograph, double-layer super-twist nematic) liquid crystal display.
On the basis of common knowledge of the art, above-mentioned each optimum condition can be combined arbitrarily to get each preferable reality of the present invention
Example.
The positive effect of the present invention is that：The present invention by between Source lines and common end increase TFT devices,
And by controlling control of the chip to TFT device break-makes so that the residual charge after power down on Source lines can pass through increasing
The TFT devices added discharge completely, have not only accelerated the rate of release of residual charge, but also do not interfere with the ESD protection of liquid crystal display
Ability, it is simple in structure, facilitate control.
Description of the drawings
Fig. 1 is the functional block diagram of the discharge circuit of liquid crystal display in the prior art.
Fig. 2 is the functional block diagram of the discharge circuit of the liquid crystal display of the embodiment of the present invention 1.
Fig. 3 is the functional block diagram of the discharge circuit of the liquid crystal display of the embodiment of the present invention 2.
Specific implementation mode
It is further illustrated the present invention below by the mode of embodiment, but does not therefore limit the present invention to the reality
It applies among a range.
Embodiment 1
The present embodiment provides a kind of discharge circuits of liquid crystal display, as shown in Fig. 2, including pixel capacitance 11, the first ESD
Device 12, the first TFT devices T1, the 2nd TFT devices T2, control chip (not shown) and Source lines 13 are protected,
The I/O pins Pin1 of the control chip is electrically connected with the grid of the first TFT devices T1, the I/ of the control chip
O pins Pin2 is electrically connected with the grid of the 2nd TFT devices T2, the drain electrode of the first TFT devices T1, the drain electrode of the 2nd TFT devices T2
And first one end of ESD protective device 12 be electrically connected with Source lines 13, the source electrode and pixel capacitance of the first TFT devices T1
11 electrical connections, the source electrode of the 2nd TFT devices T2 and the other end of the first ESD protective device 12 are electrically connected with common end COM.
In the present embodiment, when liquid crystal display powers on, the output level of control chip controls I/O pins Pin1 so that
First TFT devices T1 conducting, Source lines are by the first TFT devices T1 to pixel capacitance charges；When liquid crystal display power down,
Control chip controls the output level of I/O pin Pin1 and I/O pins Pin2 respectively so that the first TFT devices T1 is disconnected and the
Two TFT devices T2 are connected, and the charge on Source lines is mainly discharged by the path of the 2nd TFT devices T2 to common end.
In the present embodiment, by the 2nd TFT device T2 of increase between Source lines and common end, and passes through and control core
The control of the 2nd TFT device T2 break-makes of piece pair so that the residual charge after power down on Source lines can pass through increased second
TFT devices T2 discharges completely, increases the release way of residual charge, has not only accelerated the rate of release of residual charge, but also will not
The ESD protection capability of liquid crystal display is influenced, it is simple in structure, facilitate control.
Embodiment 2
The present embodiment provides a kind of discharge circuits of liquid crystal display, as shown in figure 3, with liquid crystal display in embodiment 1
Discharge circuit difference lies in：
(1) discharge circuit of the present embodiment has increased the 3rd TFT devices T3, testing weld pad 14 and the second ESD protective device newly
15, it is described control chip I/O pins Pin3 be electrically connected with the grid of the 3rd TFT devices T3, the source electrode of the 3rd TFT devices T3 and
The drain electrode of first TFT devices T1 is electrically connected, and testing weld pad 14 is series between the drain electrode and common end COM of the 3rd TFT devices T3,
Second ESD protective device 15 is series between testing weld pad 14 and common end COM；
(2) in the discharge circuit of the present embodiment, the first ESD protective device 12 includes the diode of two groups of reverse parallel connections, the
Two ESD protective devices 15 include the diode of one group of reverse parallel connection.
The present embodiment also provides a kind of liquid crystal display, including the present embodiment discharge circuit as described above.
In the present embodiment, liquid crystal display is TFT LCD, TN liquid crystal displays, stn liquid crystal display or DSTN
Liquid crystal display.
It is given a concrete illustration below to illustrate the operation principle of the discharge circuit of liquid crystal display in the present embodiment.
When liquid crystal display powers on, control chip controls I/O pins Pin1 exports high level, at this time the first TFT devices
T1 is connected, and Source lines are by the first TFT devices T1 to pixel capacitance charges；When liquid crystal display power down, chip control is controlled
I/O pins Pin1 processed exports low level, control I/O pins Pin2 output high level and maintenance high level 16ms, at this time the first TFT
Device T1 is disconnected and the 2nd TFT devices T2 conductings, and the charge on Source lines mainly arrives common end by the 2nd TFT devices T2
Path is discharged.Wherein, before the liquid-crystalline glasses of liquid crystal display do not bind driving IC, control chip controls I/O draws
The output level of foot Pin3 so that the 3rd TFT devices T3 is connected and drives liquid crystal display, with the display of detection LCD monitor
Visual effect；After driving IC bindings, the output level of control chip controls I/O pins Pin3 so that the 3rd TFT devices T3 is disconnected
It opens.
In addition, control chip controls I/O pins Pin2 maintains the time of high level that can carry out software according to actual conditions
Setting, such as can be not limited to according to the settings such as the size of residual charge and the wire width of discharge path on Source lines
16ms in above-mentioned example.
It should be noted that the output level of control chip I/O pins and the correspondence of TFT device break-makes can bases
Actual conditions are configured, such as can be configured according to the self structure (N-channel or P-channel) of TFT devices.
In the present embodiment, by the basis of existing discharge circuit, increasing the release way of charge on Source lines, tool
Body, by increasing by the 2nd TFT devices T2 between Source lines and common end so that residual charge passes through the 2nd TFT devices
The path of T2 to common end is fully discharged, while will not also be impacted to the ESD protection capability of liquid crystal display.Separately
Outside, the discharge circuit of the present embodiment is simple in structure, facilitates control.
Although specific embodiments of the present invention have been described above, it will be appreciated by those of skill in the art that these
It is merely illustrative of, protection scope of the present invention is defined by the appended claims.Those skilled in the art is not carrying on the back
Under the premise of from the principle and substance of the present invention, many changes and modifications may be made, but these are changed
Protection scope of the present invention is each fallen with modification.
Claims (5)
1. a kind of discharge circuit of liquid crystal display, which is characterized in that including pixel capacitance, the first ESD protective device, first
TFT devices, the 2nd TFT devices, control chip and Source lines,
First I/O pins of the control chip are electrically connected with the grid of the first TFT devices, and the second of the control chip
I/O pins are electrically connected with the grid of the 2nd TFT devices, the draining of the first TFT devices, the 2nd TFT devices
One end of drain electrode and first ESD protective device is electrically connected with the Source lines, the source electrode of the first TFT devices
Be electrically connected with the pixel capacitance, the source electrode of the 2nd TFT devices and the other end of first ESD protective device with
Common end is electrically connected.
2. discharge circuit as described in claim 1, which is characterized in that the discharge circuit further includes the 3rd TFT devices, test
3rd I/O pins of pad and the second ESD protective device, the control chip are electrically connected with the grid of the 3rd TFT devices,
The source electrode of the 3rd TFT devices is electrically connected with the drain electrode of the first TFT devices, and the testing weld pad is series at the third
Between the drain electrode of TFT devices and second ESD protective device, second ESD protective device is series at the testing weld pad
Between the common end.
3. discharge circuit as claimed in claim 2, which is characterized in that first ESD protective device and the 2nd ESD are protected
Protect the diode that device includes at least one set of reverse parallel connection.
4. a kind of liquid crystal display, which is characterized in that including discharge circuit according to any one of claims 1 to 3.
5. liquid crystal display as claimed in claim 4, which is characterized in that the liquid crystal display is TFT LCD, TN
Liquid crystal display, stn liquid crystal display or DSTN liquid crystal displays.
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 |
|---|---|---|---|
| CN201510995898.5A CN105388648B (en) | 2015-12-25 | 2015-12-25 | Liquid crystal display and its discharge circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105388648A CN105388648A (en) | 2016-03-09 |
| CN105388648B true CN105388648B (en) | 2018-10-12 |
Family
ID=55421089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510995898.5A Active CN105388648B (en) | 2015-12-25 | 2015-12-25 | Liquid crystal display and its discharge circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105388648B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106959562B (en) * | 2017-05-09 | 2021-01-08 | 惠科股份有限公司 | Display panel |
| CN107315293B (en) * | 2017-05-22 | 2020-08-11 | 京东方科技集团股份有限公司 | Array substrate, manufacturing method thereof and display device |
| CN107658856B (en) * | 2017-10-30 | 2024-03-26 | 长鑫存储技术有限公司 | Electrostatic protection circuit and integrated circuit chip |
| CN107910858B (en) * | 2017-12-07 | 2020-09-18 | 长鑫存储技术有限公司 | Low-voltage electrostatic protection circuit, chip circuit and electrostatic protection method thereof |
| 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 |
| CN109192152B (en) * | 2018-08-29 | 2021-01-01 | 努比亚技术有限公司 | LCD control circuit and terminal |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648753A (en) * | 2005-03-11 | 2005-08-03 | 友达光电股份有限公司 | Display unit |
| CN1851546A (en) * | 2005-04-22 | 2006-10-25 | 中国科学院长春光学精密机械与物理研究所 | Silicon-base liquid crystal display device frame storage pixel circuit |
| CN101276555A (en) * | 2007-03-28 | 2008-10-01 | 中国科学院微电子研究所 | Frame storage pixel circuit for silicon based LCD device |
| CN104570417A (en) * | 2014-12-23 | 2015-04-29 | 上海天马微电子有限公司 | Liquid crystal display screen and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199513B (en) * | 2013-02-22 | 2016-04-06 | 合肥京东方光电科技有限公司 | Electrostatic discharge protective circuit, display unit and electrostatic protection method |
-
2015
- 2015-12-25 CN CN201510995898.5A patent/CN105388648B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1648753A (en) * | 2005-03-11 | 2005-08-03 | 友达光电股份有限公司 | Display unit |
| CN1851546A (en) * | 2005-04-22 | 2006-10-25 | 中国科学院长春光学精密机械与物理研究所 | Silicon-base liquid crystal display device frame storage pixel circuit |
| CN101276555A (en) * | 2007-03-28 | 2008-10-01 | 中国科学院微电子研究所 | Frame storage pixel circuit for silicon based LCD device |
| CN104570417A (en) * | 2014-12-23 | 2015-04-29 | 上海天马微电子有限公司 | Liquid crystal display screen and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105388648A (en) | 2016-03-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105388648B (en) | Liquid crystal display and its discharge circuit | |
| US11296125B2 (en) | Array substrate and display panel | |
| CN202736443U (en) | Display, array substrate and test circuit of array substrate | |
| CN105070239B (en) | A kind of liquid crystal display panel | |
| CN106356033A (en) | Shutdown discharging circuit and method, display module and display device | |
| CN102640042B (en) | Liquid crystal indicator | |
| CN105739206B (en) | array substrate and liquid crystal display device | |
| CN104113053B (en) | Electrostatic discharge protection circuit, display substrate and display device | |
| CN104570417B (en) | A kind of liquid crystal display and electronic equipment | |
| CN103515941B (en) | ESD protection circuit, array base palte and display unit | |
| CN203085140U (en) | Grid line integrated drive circuit, array substrate and display device | |
| CN105607316A (en) | Array substrate mother board and display panel mother board | |
| US10197866B2 (en) | Array substrate and manufacturing method thereof, display panel and manufacturing method thereof, and display device | |
| CN113643636B (en) | Test circuit of display panel and display device | |
| CN101604515A (en) | Discharge circuit and display device with discharge circuit | |
| CN107103888B (en) | Time sequence driving circuit, driving circuit and the liquid crystal display panel of liquid crystal display panel | |
| CN105976745A (en) | Array substrate test circuit, display panel and flat panel display device | |
| CN106843354B (en) | A kind of current foldback circuit, display panel and display device | |
| TW201411596A (en) | Electrostatic discharge protection circuit and display apparatus usning the same | |
| WO2019041605A1 (en) | Static electricity protection circuit for display panel, and display panel | |
| JP2015111191A (en) | Wiring board and display device | |
| CN202677789U (en) | Display device, display panel and detection circuit of drive current thereof | |
| KR20120056507A (en) | A liquid crystal display apparatus and an array substrate thereof | |
| CN107833883A (en) | A kind of electrostatic discharge protection circuit structure, display panel and display device | |
| CN101726943A (en) | Active component array substrate, liquid-crystal display panel and detection method for both |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |