CN110060647A - Discharge circuit and display device including it - Google Patents
Discharge circuit and display device including it Download PDFInfo
- Publication number
- CN110060647A CN110060647A CN201910392968.6A CN201910392968A CN110060647A CN 110060647 A CN110060647 A CN 110060647A CN 201910392968 A CN201910392968 A CN 201910392968A CN 110060647 A CN110060647 A CN 110060647A
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- China
- Prior art keywords
- clock signal
- discharge circuit
- switch element
- switching element
- common electrode
- Prior art date
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- Granted
Links
- 238000007599 discharging Methods 0.000 claims abstract description 3
- 239000010409 thin film Substances 0.000 claims description 8
- 239000004973 liquid crystal related substance Substances 0.000 description 9
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
A kind of discharge circuit, the charge on common electrode for discharging display device, comprising: timing controller, first switching element and second switch element.Timing controller is used to export the clock signal of reverse phase each other.First switching element, control terminal receive one of them of the clock signal of reverse phase each other, and input terminal and common electrode are electrically connected.Second switch element, control terminal receive the another one of the clock signal of reverse phase each other, and the output end electric connection of input terminal and first switching element, output end and ground terminal are electrically connected.When display device shutdown, timing controller controls the phase of clock signal, so that first switching element and second switch element simultaneously turn on, to form the discharge path from common electrode to ground terminal.
Description
Technical field
The present invention relates to field of display technology more particularly to a kind of discharge circuits for display device.
Background technique
Liquid crystal display is after shut down, it is necessary to discharge pixel capacitance, will not just there is ghost.In traditional liquid crystal
In display, since common electrode does not have the discharge circuit of own, when liquid crystal display shutdown, liquid crystal electrode and common electricity
There are still potential differences between pole.If this potential difference is not eliminated, when backlight module (backlight unit) opens or work as light
When being irradiated to liquid crystal surfactant, liquid crystal display will appear flashing, to reduce display quality.
Therefore, it is necessary to a kind of discharge circuit be provided, to solve the above problems.
Summary of the invention
The purpose of the present invention is to provide a kind of discharge circuits, can solve the flicker problem of display device, so that it is guaranteed that
Show quality.
To achieve the above object, the present invention provides a kind of discharge circuit of display device, for discharging on common electrode
Charge characterized by comprising timing controller, for exporting the clock signal of at least a pair of reverse phase each other；First switch
Element, control terminal receive one of them of at least a pair of clock signal, and input terminal and the common electrode are electrical
Connection；And second switch element, control terminal receive the another one of at least a pair of clock signal, input terminal
It is electrically connected with the output end of the first switching element, output end and ground terminal are electrically connected；Wherein, when the display fills
When setting shutdown, the phase of timing controller control at least a pair of clock signal of reverse phase each other, so that described the
One switch element and the second switch element simultaneously turn on, to form the electric discharge road from the common electrode to the ground terminal
Diameter.
In some embodiments, the timing controller is the integer greater than 2 for exporting n clock signal, n.
In some embodiments, the discharge circuit further includes n-2 switch element, the first switching element, described
Second switch element and the n-2 switch element be one another in series and be electrically connected at the common electrode and the ground terminal it
Between, the control terminal of the first switching element, the second switch element and the n-2 switch element receives the n respectively
A clock signal.
In some embodiments, the timing controller is for exporting 2n clock signal, m-th of clock signal and the
M+n clock signal reverse phase each other, wherein n is the integer greater than 0, and 0 < m < n+1.
In some embodiments, control terminal reception m-th of clock signal of the first switching element, described second
The control terminal of switch element receives the m+n clock signal.
In some embodiments, the common electrode is connect with common voltage input terminal.
In some embodiments, when the display device is shut down, the timing controller control is described at least a pair of
The phase of clock signal is same phase.
In some embodiments, the supreme electricity of phase of the timing controller pull-up at least a pair of of clock signal
It is flat.
In some embodiments, the first switching element and the second switch element are thin film transistor (TFT).
To achieve the above object, the present invention also provides a kind of display devices, which is characterized in that including electric discharge electricity above-mentioned
Road.
For feature and technology contents of the invention can be clearer and more comprehensible, please refer to below in connection with it is of the invention specifically
Bright and attached drawing, however attached drawing is only provided with reference to using, and is not intended to limit the present invention.
Detailed description of the invention
Fig. 1 is the electrical block diagram using the display device of the discharge circuit of the embodiment of the present invention one；
Fig. 2 is the electrical block diagram using the display device of the discharge circuit of the embodiment of the present invention two；
Fig. 3 is the working timing figure of Fig. 1 and circuit shown in Fig. 2.
Specific embodiment
In order to keep the purpose of the present invention, technological means and its effect more explicit, below with reference to attached drawing to this hair
It is bright further to illustrate.It should be appreciated that embodiment described herein is only a part of the embodiment of the present invention, rather than it is complete
The embodiment in portion, is not intended to limit the present invention.
Referring to FIG. 1, the circuit structure of its display device for showing the discharge circuit using the embodiment of the present invention one is illustrated
Figure.In this example it is shown that device 1 includes gate drivers 10, source electrode driver 11, multiple pixel units 12, electric discharge electricity
Road 13, multi-strip scanning line GL and multiple data lines SL.Discharge circuit 13 is used to discharge the charge on common electrode CE.Pixel unit
12 are set on the crossover location of scan line GL and data line SL.Pixel unit 12 includes thin film transistor (TFT) Tp, pixel electrode PE
With common electrode CE.The grid of thin film transistor (TFT) Tp is connect with scan line GL, and the source electrode and data line SL of thin film transistor (TFT) Tp connects
It connects.The drain electrode of thin film transistor (TFT) Tp is connect with pixel electrode PE.Common electrode CE is connect with common voltage input terminal VCOM.Specifically
Ground, display device 1 can be liquid crystal display device.Liquid crystal born of the same parents LC is equipped between common electrode CE and pixel electrode PE.
As shown in Figure 1, discharge circuit 13 includes timing controller 14, first switching element T1 and second switch element
T2.In some embodiments, timing controller 14 is used to export the clock signal of at least a pair of reverse phase each other, first switch member
Part T1 and second switch element T2 is thin film transistor (TFT).In the present embodiment, timing controller 14 is for exporting 2n clock
Signal CK1-CK2n is to gate drivers 10, so that gate drivers 10 are sequentially driven scan line GL.Furthermore m-th of clock letter
Number CKm and the m+n clock signal CKm+n reverse phase each other, wherein n is the integer greater than 0, and 0 < m < n+1.For example,
If n is equal to the 2, the 1st clock signal CK1 and the 3rd clock signal CK3 reverse phase, and the 2nd clock signal CK2 and the 4th each other
A clock signal CK4 reverse phase each other.
It continues to refer to figure 1, the control terminal of first switching element T1 receives wherein the one of at least a pair of clock signal
A, the input terminal and common electrode CE of first switching element T1 is electrically connected.In the present embodiment, the control of first switching element T1
End processed receives m-th of clock signal CKm (such as CK1, CK2).The control terminal of second switch element T2 receives described at least a pair
The another one of clock signal, the input terminal of second switch element T2 and the output end of first switching element T1 are electrically connected,
The output end and ground terminal of second switch element T2 is electrically connected.In the present embodiment, the control termination of second switch element T2
Receive the m+n clock signal CKm+n (such as CK3, CK4).When display device 1 is shut down, the control of timing controller 14 is anti-each other
The phase of the clock signal CKm, CKm+n of phase, so that first switching element T1 and second switch element T2 are simultaneously turned on, to be formed
From common electrode CE to the discharge path P1 of the ground terminal.
Referring to FIG. 2, the circuit structure of its display device for showing the discharge circuit using the embodiment of the present invention two is illustrated
Figure.Fig. 2 and Fig. 1's the difference is that, timing controller 14 for exporting n clock signal CK1-CKn to gate drivers 10,
N is the integer greater than 2.Discharge circuit 13 further includes n-2 switch element T3-Tn, first switching element T1, second switch element
T2 and the n-2 switch element T3-Tn are one another in series and are electrically connected between common electrode CE and ground terminal, first switch
The control terminal of element T1, second switch element T2 and the n-2 switch element T3-Tn receive the n clock signal respectively
CK1-CKn.When display device 1 is shut down, timing controller 14 controls the phase of all clock signal CK1-CKn, so that
All switch element T1-Tn are simultaneously turned on, to form the discharge path P2 from common electrode CE to the ground terminal.
Fig. 3 is the working timing figure of Fig. 1 and circuit shown in Fig. 2.When display device 1 enters start-up phase T1, source electrode
Driver 11 is sequentially driven scan line GL according to display data-driven data line SL, gate drivers 10.As shown in figure 3, grid
Control signal GL1-GLn is sequentially pulled to high level.Clock signal CK1, CK3 reverse phase each other, clock signal CK2, CK4 are each other
Reverse phase, so that all switch elements (such as T1, T2 etc.) can not be switched on simultaneously.
When display device 1 enters shut-down-phase T2, the output signal SL1 of source electrode driver 11 is pulled down to low level, institute
Some grid control signal GL1-GLn are pulled to high level.The phase of at least a pair of of clock signal of the control of timing controller 14
Position is same phase.In some embodiments, the phase of at least a pair of of clock signal of the pull-up of timing controller 14 is to high level.At this
In embodiment, all clock signal CK1-CK4 are pulled to high level.Then, thin film transistor (TFT) Tp and all switches member
Part (such as T1, T2 etc.) is all switched on.Charge on shut-down-phase T2, liquid crystal electrode PE and common electrode CE is fast released,
Final pixel capacitor is completely discharged.
In conclusion discharge circuit provided by the invention, formed by concatenated switch element from common electrode CE to connecing
The discharge path of ground terminal, so that it is guaranteed that display quality.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can
With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention
Protect range.
Claims (10)
1. a kind of discharge circuit of display device, for discharging the charge on common electrode characterized by comprising
Timing controller, for exporting the clock signal of at least a pair of reverse phase each other；
First switching element, control terminal receive one of them of at least a pair of clock signal, input terminal with it is described
Common electrode is electrically connected；And
Second switch element, control terminal receive the another one of at least a pair of clock signal, input terminal and institute
The output end for stating first switching element is electrically connected, and output end and ground terminal are electrically connected；Wherein,
When display device shutdown, timing controller control at least a pair of clock signal of reverse phase each other
Phase, so that the first switching element and the second switch element simultaneously turn on, to be formed from the common electrode to institute
State the discharge path of ground terminal.
2. discharge circuit as described in claim 1, which is characterized in that the timing controller is for exporting n clock letter
Number, n is the integer greater than 2.
3. discharge circuit as claimed in claim 2, which is characterized in that it further include n-2 switch element, the first switch member
Part, the second switch element and the n-2 switch element are one another in series and are electrically connected at the common electrode and described
Between ground terminal, the control terminal of the first switching element, the second switch element and the n-2 switch element connects respectively
Receive the n clock signal.
4. discharge circuit as described in claim 1, which is characterized in that the timing controller is for exporting 2n clock letter
Number, m-th clock signal and the m+n clock signal reverse phase each other, wherein n is the integer greater than 0, and 0 < m < n+1.
5. discharge circuit as claimed in claim 4, which is characterized in that the control terminal of the first switching element receives described the
The control terminal of m clock signal, the second switch element receives the m+n clock signal.
6. discharge circuit as described in claim 1, which is characterized in that the common electrode is connect with common voltage input terminal.
7. discharge circuit as described in claim 1, which is characterized in that when display device shutdown, the timing control
The phase of at least a pair of of clock signal is same phase described in chip controls.
8. discharge circuit as claimed in claim 7, which is characterized in that the timing controller pulls up an at least clock synchronization
The phase of clock signal is to high level.
9. discharge circuit as described in claim 1, which is characterized in that the first switching element and the second switch element
For thin film transistor (TFT).
10. a kind of display device, which is characterized in that including discharge circuit described in claim 1.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910392968.6A CN110060647B (en) | 2019-05-13 | 2019-05-13 | Discharge circuit and display device comprising same |
| PCT/CN2019/099699 WO2020228154A1 (en) | 2019-05-13 | 2019-08-08 | Discharge circuit and display apparatus comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910392968.6A CN110060647B (en) | 2019-05-13 | 2019-05-13 | Discharge circuit and display device comprising same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110060647A true CN110060647A (en) | 2019-07-26 |
| CN110060647B CN110060647B (en) | 2020-05-22 |
Family
ID=67322946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910392968.6A Active CN110060647B (en) | 2019-05-13 | 2019-05-13 | Discharge circuit and display device comprising same |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110060647B (en) |
| WO (1) | WO2020228154A1 (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001127816A (en) * | 1999-10-28 | 2001-05-11 | Tamura Electric Works Ltd | Modulation circuit |
| CN1664739A (en) * | 2004-03-04 | 2005-09-07 | 精工爱普生株式会社 | Common voltage generation circuit, power supply circuit, display driver, and common voltage generation method |
| CN101217026A (en) * | 2007-01-06 | 2008-07-09 | 三星电子株式会社 | Liquid crystal display and method for eliminating afterimage thereof |
| CN101556776A (en) * | 2008-04-10 | 2009-10-14 | 北京京东方光电科技有限公司 | Driving circuit for realizing rapid discharge of pixel thin film transistor |
| CN104616615A (en) * | 2015-02-10 | 2015-05-13 | 昆山龙腾光电有限公司 | Screen clearing circuit and display device |
| CN108398981A (en) * | 2018-02-12 | 2018-08-14 | 南京中电熊猫平板显示科技有限公司 | A kind of control circuit of display device, display device and its control method |
| CN108877628A (en) * | 2018-07-17 | 2018-11-23 | 南京中电熊猫平板显示科技有限公司 | Discharge circuit, display device and the charging method of display device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102855839A (en) * | 2012-09-21 | 2013-01-02 | 京东方科技集团股份有限公司 | Circuit for removing shutdown blur of display |
-
2019
- 2019-05-13 CN CN201910392968.6A patent/CN110060647B/en active Active
- 2019-08-08 WO PCT/CN2019/099699 patent/WO2020228154A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001127816A (en) * | 1999-10-28 | 2001-05-11 | Tamura Electric Works Ltd | Modulation circuit |
| CN1664739A (en) * | 2004-03-04 | 2005-09-07 | 精工爱普生株式会社 | Common voltage generation circuit, power supply circuit, display driver, and common voltage generation method |
| CN101217026A (en) * | 2007-01-06 | 2008-07-09 | 三星电子株式会社 | Liquid crystal display and method for eliminating afterimage thereof |
| CN101556776A (en) * | 2008-04-10 | 2009-10-14 | 北京京东方光电科技有限公司 | Driving circuit for realizing rapid discharge of pixel thin film transistor |
| CN101556776B (en) * | 2008-04-10 | 2011-06-08 | 北京京东方光电科技有限公司 | Driving circuit for realizing rapid discharge of pixel thin film transistor |
| CN104616615A (en) * | 2015-02-10 | 2015-05-13 | 昆山龙腾光电有限公司 | Screen clearing circuit and display device |
| CN108398981A (en) * | 2018-02-12 | 2018-08-14 | 南京中电熊猫平板显示科技有限公司 | A kind of control circuit of display device, display device and its control method |
| CN108877628A (en) * | 2018-07-17 | 2018-11-23 | 南京中电熊猫平板显示科技有限公司 | Discharge circuit, display device and the charging method of display device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020228154A1 (en) | 2020-11-19 |
| CN110060647B (en) | 2020-05-22 |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL China Star Optoelectronics Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |