CN201780436U - Display device - Google Patents
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- CN201780436U CN201780436U CN2010205204464U CN201020520446U CN201780436U CN 201780436 U CN201780436 U CN 201780436U CN 2010205204464 U CN2010205204464 U CN 2010205204464U CN 201020520446 U CN201020520446 U CN 201020520446U CN 201780436 U CN201780436 U CN 201780436U
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- common voltage
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- voltage generator
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Abstract
The utility model relates to a display device which comprises a display panel, a common voltage generator and a discharge circuit; the display panel is provided with a common electrode layer; the common voltage generator is used for providing a common voltage; the discharge circuit is coupled between the common electrode layer and the common voltage generator; when the common voltage generator provides a common voltage, the discharge circuit transmits the common voltage to the common electrode layer; when the common voltage generator does not provide a common voltage, the discharge circuit performs electric discharge on the common electrode layer. Therefore, the electric charge is prevented from being left in the common electrode layer.
Description
Technical field
The utility model relates to a kind of display device, and particularly relevant for a kind of display device with discharge circuit.
Background technology
Flat-panel screens is LCD for example, is widely used recently.Improvement along with semiconductor technology, make LCD have advantages such as low consumption of electric power, slim amount is light, resolution is high, color saturation is high, the life-span is long, thereby be widely used in the electronic product closely bound up such as the liquid crystal screen of mobile computer or desktop PC and LCD TV (LCD TV) with life.
With the display panel of flat-panel screens, its data line is in order to receive driving voltage, and its sweep trace is in order to receive sweep signal.See through corresponding sweep signal, driving voltage can write in the corresponding picture element.And the common electrode layer of display panel can form the liquid crystal capacitance of each picture element with the pixel electrode of each picture element, to store corresponding driving voltage.And common electrode layer can receive a common voltage, with the pressure differential liquid crystal of foundation common voltage and driving voltage.
When display panel operates, can be full of electric charge on data line, sweep trace and the common electrode layer.When display panel decommissions, data line, the online remaining electric charge of scanning can see through source electrode driver (source driver) and gate pole driver (gate driver) and the importing earth terminal, common electrode layer remaining electric charge then do not have corresponding elements electric charge imported earth terminal, thereby may produce the phenomenon of image residue.
In addition, in display panel manufacturing process, electric charge can enter internal layer because of outer induction, makes data line, sweep trace and common electrode layer to respond to and produces electric charge.Because the electric charge on the common electrode layer can't import earth terminal, the electric charge on the common electrode layer can influence liquid crystal.If the The Long-term Effect liquid crystal then can cause and burn attached (burn-in) phenomenon, and then influence the display effect of display panel.
Summary of the invention
The utility model provides a kind of display device, and it sees through discharge circuit common electrode layer is discharged, so that the electric charge on the common electrode layer can be imported into earth terminal.
The utility model proposes a kind of display device, it comprises display panel, common voltage generator and discharge circuit.Display panel has common electrode layer.The common voltage generator is in order to provide common voltage.Discharge circuit is coupled between common electrode layer and the common voltage generator.When the common voltage generator provided common voltage, discharge circuit transmitted common voltage to common electrode layer.When the common voltage generator did not provide common voltage, discharge circuit discharged to common electrode layer.
In an embodiment of the present utility model, above-mentioned discharge circuit comprises first resistance.First end of first resistance couples common electrode layer and common voltage generator, and second end of first resistance couples earth terminal.
In an embodiment of the present utility model, above-mentioned discharge circuit comprises transistor, second resistance, the 3rd resistance and diode.First end of second resistance couples the common voltage generator.Transistorized first end couples first end and the common voltage generator of second resistance, and transistorized second end couples common electrode layer, and transistorized control end couples second end of second resistance.First end of the 3rd resistance couples second end of second resistance, and second end of the 3rd resistance couples earth terminal.The negative electrode of diode couples transistorized first end, and the anode of diode couples transistorized second end.
In an embodiment of the present utility model, above-mentioned transistor be PNP two-carrier transistor (bipolar junction transistor, BJT).And transistorized first end is an emitter-base bandgap grading, and transistorized second end is the collection utmost point, and transistorized control end is a base stage.
In an embodiment of the present utility model, above-mentioned transistor is the PMOS transistor.And transistorized first end is a source electrode, and transistorized second end is a drain, and transistorized control end is a gate.
In an embodiment of the present utility model, above-mentioned display panel is a display panels.
Based on above-mentioned, display device of the present utility model when its discharge circuit provides common voltage in the common voltage generator, is sent to common electrode layer with common voltage.When the common voltage generator did not provide common voltage, discharge circuit can import earth terminal with the electric charge of common electrode layer.By this, can avoid the remaining of electric charge on the common electrode layer, and then eliminate of the influence of remaining electric charge display panel.
For above-mentioned feature and advantage of the present utility model can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Fig. 1 is the system schematic according to the display device of the utility model one embodiment.
Fig. 2 couples the circuit diagram of common voltage generator 111 and common electrode layer 145 according to the discharge circuit 150 of the utility model one embodiment for Fig. 1.
Fig. 3 couples the circuit diagram of common voltage generator 111 and common electrode layer 145 according to the discharge circuit 150 of another embodiment of the utility model for Fig. 1.
Fig. 4 for Fig. 1 according to the utility model again the discharge circuit 150 of an embodiment couple the circuit diagram of common voltage generator 111 and common electrode layer 145.
[main element symbol description]
100: display device
110: time schedule controller
111: the common voltage generator
120: gate pole driver
130: source electrode driver
140: display panel
141: data line
143: sweep trace
145: common electrode layer
150: discharge circuit
A ~ n: end points
D1: diode
P: picture element
R1, R2, R3: resistance
SC: sweep signal
T1, M1: transistor
VD: driving voltage
Vcom: common voltage.
Embodiment
Fig. 1 is the system schematic according to the display device of the utility model one embodiment.Please refer to Fig. 1, in the present embodiment, display device 100 comprises time schedule controller 110, gate pole driver 120, source electrode driver 130, display panel 140 and discharge circuit 150.Display panel 140 can be a display panels, and display panel 140 comprises the picture element P of many data lines 141, multi-strip scanning line 143, common electrode layer 145 and a plurality of arrayed.Gate pole driver 120 is controlled by time schedule controller 110, and export a plurality of sweep signal SC to sweep trace 143 to drive each row picture element P.Source electrode driver 150 also is controlled by time schedule controller 110, and the corresponding a plurality of driving voltage VD of output to data line 141 to write driven picture element P.
Fig. 2 couples the circuit diagram of common voltage generator 111 and common electrode layer 145 according to the discharge circuit 150 of the utility model one embodiment for Fig. 1.Please refer to Fig. 2, in the present embodiment, discharge circuit 150 comprises first resistance R 1.The second end b that the first end a of first resistance R 1 couples common voltage generator 111 and common electrode layer 145, the first resistance R 1 couples earth terminal GND.When common voltage generator 111 provided common voltage Vcom, the cross-pressure of first resistance R 1 can approximate common voltage Vcom, so that common voltage Vcom is sent to common electrode layer 145.When common voltage generator 111 did not provide common voltage Vcom, the electric charge on the common electrode layer 145 can see through first resistance R 1 and import earth terminal GND, and was remaining to avoid electric charge.
Fig. 3 couples the circuit diagram of common voltage generator 111 and common electrode layer 145 according to the discharge circuit 150 of another embodiment of the utility model for Fig. 1.Please join Fig. 3, in the present embodiment, discharge circuit 150 comprises transistor T 1, second resistance R 2, the 3rd resistance R 3 and diode D1, and wherein transistor T 1 is to be example with PNP two-carrier transistor.The first end c of second resistance R 2 couples common voltage generator 111.The emitter-base bandgap grading e(of transistor T 1 i.e. first end) couple the first end c and the common voltage generator 111 of second resistance R 2, the collection utmost point f(of transistor T 1 i.e. second end) couple common electrode layer 145, the base stage g(of transistor T 1 is a control end) couple the second end d of second resistance R 2.The first end h of the 3rd resistance R 3 couples the second end d of second resistance R 2, and the second end i of the 3rd resistance R 3 couples earth terminal GND.The emitter-base bandgap grading e(that the negative electrode j of diode D1 couples transistor T 1 is first end), the collection utmost point f(that the anode k of diode D1 couples transistor T 1 is second end).
When common voltage generator 111 provided common voltage Vcom, second resistance R 2 and the 3rd resistance R 3 can be carried out dividing potential drop to common voltage Vcom, and this dividing potential drop can provide to the base stage g of transistor T 1, so that transistor T 1 presents conducting.At this moment, common voltage Vcom can be sent to common electrode layer 145 through the transistor T 1 of conducting.Otherwise when common voltage generator 111 did not provide common voltage Vcom, transistor T 1 can present not conducting, and the electric charge on the common electrode layer 145 can see through diode D1, second resistance R 2 and the 3rd resistance R 2 importing earth terminal GND, and is remaining to avoid electric charge.
What deserves to be mentioned is, when display device 100 in when running, common voltage generator 111 can provide common voltage Vcom.Yet,, cause the voltage on the common electrode layer 145 may be higher than common voltage Vcom because common electrode layer 145 may be coupled with the signal (for example sweep signal SC or driving voltage VD) on the display panel 140.At this moment, diode D1 can present forward conducting, approximates common voltage Vcom and voltage on the common electrode layer 145 is returned back to.By this, when display device 100 runnings, the voltage quasi position that can see through diode D1 strangulation common electrode layer 145 is about common voltage Vcom.
Fig. 4 for Fig. 1 according to the utility model again the discharge circuit 150 of an embodiment couple the circuit diagram of common voltage generator 111 and common electrode layer 145.Please refer to Fig. 3 and Fig. 4, its difference is transistor M1.Transistor M1 is example at this with the PMOS transistor, and the source electrode l(of transistor M1 i.e. first end) couple the first end c and the common voltage generator 111 of second resistance R 2, the drain m(of transistor M1 i.e. second end) couple common electrode layer 145, the gate n(of transistor M1 is a control end) couple the second end d of second resistance R 2.
In sum, the display device of the utility model embodiment when its discharge circuit provides common voltage in the common voltage generator, is sent to common electrode layer with common voltage.When the common voltage generator did not provide common voltage, discharge circuit can import earth terminal with the electric charge of common electrode layer.By this, can avoid the remaining of electric charge on the common electrode layer, and then eliminate of the influence of remaining electric charge display panel.And, in discharge circuit, dispose diode, but the voltage quasi position of strangulation common electrode layer is maintained at common voltage.
Though the utility model discloses as above with embodiment; right its is not in order to limit the utility model; have in the technical field under any and know the knowledgeable usually; in not breaking away from spirit and scope of the present utility model; when doing a little change and retouching, so protection domain of the present utility model is as the criterion when looking accompanying the claim person of defining.
Claims (8)
1. a display device is characterized in that, comprising:
One display panel has the community electrode layer;
One common voltage generator is in order to provide a common voltage; And
One discharge circuit, be coupled between this common electrode layer and this common voltage generator, when this common voltage generator provides this common voltage, this discharge circuit transmits this common voltage to this common electrode layer, when this common voltage generator did not provide this common voltage, this discharge circuit discharged to this common electrode layer.
2. display device according to claim 1 is characterized in that: wherein this discharge circuit comprises one first resistance, and first end of this first resistance couples this common electrode layer and this common voltage generator, and second end of this first resistance couples an earth terminal.
3. display device according to claim 1 is characterized in that: wherein this discharge circuit comprises:
One second resistance, first end of this second resistance couples this common voltage generator;
One transistor, this transistorized first end couple first end and this common voltage generator of this second resistance, and this transistorized second end couples this common electrode layer, and this transistorized control end couples second end of this second resistance;
One the 3rd resistance, first end of the 3rd resistance couples second end of this second resistance, and second end of the 3rd resistance couples this earth terminal; And
One diode, the negative electrode of this diode couple this transistorized first end, and the anode of this diode couples this transistorized second end.
4. display device according to claim 3 is characterized in that: wherein this transistor is a PNP transistor.
5. display device according to claim 3 is characterized in that: wherein this transistorized first end is an emitter-base bandgap grading, and this transistorized second end is a collection utmost point, and this transistorized control end is a base stage.
6. display device according to claim 3 is characterized in that: wherein this transistor is a PMOS transistor.
7. display device according to claim 3 is characterized in that: wherein this transistorized first end is an one source pole, and this transistorized second end is a drain, and this transistorized control end is a gate.
8. display device according to claim 1 is characterized in that: wherein this display panel is a display panels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205204464U CN201780436U (en) | 2010-09-07 | 2010-09-07 | Display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205204464U CN201780436U (en) | 2010-09-07 | 2010-09-07 | Display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201780436U true CN201780436U (en) | 2011-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205204464U Expired - Fee Related CN201780436U (en) | 2010-09-07 | 2010-09-07 | Display device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102967975A (en) * | 2012-11-16 | 2013-03-13 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN103632636A (en) * | 2012-08-28 | 2014-03-12 | 群康科技(深圳)有限公司 | Protection device |
| EP2790174A1 (en) * | 2013-04-01 | 2014-10-15 | Samsung Display Co., Ltd. | Liquid crystal display |
| CN104335271A (en) * | 2012-06-08 | 2015-02-04 | 苹果公司 | Differential VCOM resistance or capacitance tuning for improved image quality |
| US9250489B2 (en) | 2012-11-16 | 2016-02-02 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LCD panel with anti-electrostatic discharge function and LCD device using same |
| CN105489187A (en) * | 2016-01-27 | 2016-04-13 | 上海天马微电子有限公司 | Circuit for generating common voltage for liquid crystal panel and liquid crystal display |
-
2010
- 2010-09-07 CN CN2010205204464U patent/CN201780436U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104335271A (en) * | 2012-06-08 | 2015-02-04 | 苹果公司 | Differential VCOM resistance or capacitance tuning for improved image quality |
| CN104335271B (en) * | 2012-06-08 | 2018-03-16 | 苹果公司 | The difference VCOM resistance or capacitance tuning of picture quality are improved for obtaining |
| CN103632636A (en) * | 2012-08-28 | 2014-03-12 | 群康科技(深圳)有限公司 | Protection device |
| CN102967975A (en) * | 2012-11-16 | 2013-03-13 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| WO2014075331A1 (en) * | 2012-11-16 | 2014-05-22 | 深圳市华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN102967975B (en) * | 2012-11-16 | 2015-12-09 | 深圳市华星光电技术有限公司 | A kind of display panels and liquid crystal indicator |
| US9250489B2 (en) | 2012-11-16 | 2016-02-02 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | LCD panel with anti-electrostatic discharge function and LCD device using same |
| EP2790174A1 (en) * | 2013-04-01 | 2014-10-15 | Samsung Display Co., Ltd. | Liquid crystal display |
| CN105489187A (en) * | 2016-01-27 | 2016-04-13 | 上海天马微电子有限公司 | Circuit for generating common voltage for liquid crystal panel and liquid crystal display |
| CN105489187B (en) * | 2016-01-27 | 2018-04-10 | 上海天马微电子有限公司 | Produce the circuit and its liquid crystal display of the common electric voltage for liquid crystal panel |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: CHINA PROJECTION TUBE CO., LTD. Effective date: 20130604 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20130604 Address after: 350015 No. 1 Xingye Road, Mawei Science Park, Fujian, Fuzhou Patentee after: CPTF Optronics Co., Ltd. Address before: 350015 No. 1 Xingye Road, Mawei Science Park, Fujian, Fuzhou Patentee before: CPTF Optronics Co., Ltd. Patentee before: Chunghwa Picture Tubes Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20180907 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |