CN104616615A - Screen clearing circuit and display device - Google Patents
- ️Wed May 13 2015
CN104616615A - Screen clearing circuit and display device - Google Patents
Screen clearing circuit and display device Download PDFInfo
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Publication number
- CN104616615A CN104616615A CN201510069778.2A CN201510069778A CN104616615A CN 104616615 A CN104616615 A CN 104616615A CN 201510069778 A CN201510069778 A CN 201510069778A CN 104616615 A CN104616615 A CN 104616615A Authority
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- control signal
- display panel
- input end
- output terminal
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Abstract
The invention provides a screen clearing circuit and a display device. The screen clearing circuit comprises multiple first switch elements and multiple second switch elements. Each first switch element comprises a first control end, a first input end and a first output end, wherein the first control end is connected with the first input end and receives a control signal, each first output end is connected with one scanning line corresponding to a display panel and used for inputting the control signal to the scanning line. Each second switch element comprises a second control end, a second input end and a second output end, wherein the second control end receives the control signal, each second input end is connected with one data line corresponding to the display panel, and the second output end is connected with a public electrode of the display panel. When the display panel normally displays frames, the control signal is a low-level signal. When the display panel is powered off, the control signal is changed into a high-level signal through jumping. The display device can effectively complete screen clearing of the display panel by adopting the screen clearing circuit and is simple in structure and low in cost.
Description
Technical field
The present invention relates to display field, particularly relate to a kind of cls circuit and adopt the display device of this cls circuit.
Background technology
Along with popularizing of the pocket such as smart mobile phone, intelligent watch product, small-size display equipment is due to its operability and superior portability and more and more incorporate the life of people formidably, and the requirement of user to the display panel of small-size display equipment is also more and more higher simultaneously.With regard to small size display panel, in the use procedure of display panel, when display panel lines by line scan last column from the first row, in the display of each frame picture, each display pixel in panel all remains this current potential needed for frame picture of display.Therefore, when the power-off of display panel, each pixel is still the current potential that remain last frame, and makes display panel within a period of time, all remain the display frame of last frame, and this phenomenon is referred to as power-off ghost shadow.
In prior art, people utilize grid-driving integrated circuit (Gate Driver IntegratedCircuit, Gate Driver IC) XON (output standard-sized sheet) function eliminate ghost, such as, when reseting circuit detects supply voltage lower than detecting voltage in the moment of shutting down, reseting circuit exports electronegative potential, now the XON function of grid integrated circuits is activated, thin-film transistor gate on panel is opened, in panel, often the positive and negative charge of row pixel inside passes through and source electrode driven integrated circuit (Source Driver Integrated Circuit, Source Driver IC) connected data line is comprehensive, the electric charge of panel itself is made to disappear very soon to eliminate ghost.
But the XON function of employing Gate Driver IC of the prior art needs to be realized by IC internal circuit, and needs cls program, so makes power consumption and cost increase.In addition, if IC does not have this function, have no idea to realize cls.
In view of above problem, need to provide a kind of cls circuit, to solve above-mentioned problems of the prior art.
Summary of the invention
The invention provides a kind of cls circuit, it can carry out cls to display panel effectively, inhibits the generation of power off afterimage phenomenon, and its structure is simple, cost is low.
The invention provides a kind of cls circuit, it comprises multiple first on-off element and multiple second switch element.This first on-off element each comprises the first control end, first input end and the first output terminal, this first control end is connected with this first input end, and reception control signal, this first output terminal each connects, for inputting this control signal to this sweep trace with a corresponding sweep trace of display panel.This second switch element each comprises the second control end, the second input end and the second output terminal, this second control end receives this control signal, this second input end each connects with a corresponding data line of this display panel, and this second output terminal is connected with the public electrode of this display panel.Wherein, when the normal display frame of this display panel, this control signal is low level; When this display panel power-off, this control signal saltus step is high level.
Further, this control signal is exported by source electrode drive circuit.
Further, this control signal is exported by gate driver circuit.
Further, the plurality of first on-off element and the plurality of second switch element are field effect transistor.
Further, this first control end and this second control end are grid, and this first input end and this second input end are source electrode, and this first output terminal and this second output terminal are drain electrode.
The present invention also provides a kind of display device, and it comprises pel array, source electrode drive circuit, gate driver circuit and cls circuit.The pixel switch element that this pel array comprises multi-strip scanning line, a plurality of data lines and is electrically connected with this multi-strip scanning line and this plurality of data lines.This source electrode drive circuit and this plurality of data lines are electrically connected.This gate driver circuit and this multi-strip scanning line are electrically connected.This cls circuit comprises multiple first on-off element and multiple second switch element, each first on-off element comprises the first control end, first input end and the first output terminal, this first control end is connected with this first input end, and reception control signal, this first output terminal each connects, for inputting this control signal to this sweep trace with corresponding this sweep trace of display panel.This second switch element each comprises the second control end, the second input end and the second output terminal, this second control end receives this control signal, this second input end connects with corresponding this data line of this display panel, and this second output terminal is connected with the public electrode of this display panel.Wherein, when the normal display frame of this display panel, this control signal is low level; When this display panel power-off, this control signal saltus step is high level.
Further, this control signal is exported by source electrode drive circuit.
Further, this control signal is exported by gate driver circuit.
Further, the plurality of first on-off element and the plurality of second switch element are field effect transistor.
Further, this first control end and this second control end are grid, and this first input end and this second input end are source electrode, and this first output terminal and this second output terminal are drain electrode.
Display panel of the present invention and display device adopt control signal to control closing of the first on-off element and second switch element, and then the grid of all pixel switch elements of control display panel is closed, and make each pixel discharge to public electrode by data line, second switch element, thus complete the cls of display panel, effectively can not only remove ghost, and structure is simple and cost is low.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the display device of one embodiment of the invention.
Fig. 2 is the work schedule schematic diagram of the display device of one embodiment of the invention.
Embodiment
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Please refer to Fig. 1, Fig. 1 is the electrical block diagram of the display device of one embodiment of the invention.As shown in Figure 1, display device comprises cls circuit 1, pel array 2, gate driver circuit 3 and source electrode drive circuit 4.Multiple pixel switch elements 220 that pel array 2 comprises multi-strip scanning line 20, a plurality of data lines 21 and is electrically connected with multi-strip scanning line 20 and a plurality of data lines 21, and multi-strip scanning line 20, a plurality of data lines 21 form multiple pixel cell 22 with multiple pixel switch element 220.Gate driver circuit 3 is electrically connected with this multi-strip scanning line 20 respectively, for providing gate drive signal to this multi-strip scanning line 20.Source electrode drive circuit 4 is electrically connected with this plurality of data lines 21 respectively, for providing data-signal for this plurality of data lines 21.
Wherein, cls circuit 1 comprises multiple first on-off elements 10 and multiple second switch element 11.Each first on-off element 10 comprises the first control end 100, first input end 101 and the first output terminal 102.Wherein, the first control end 100 is connected with first input end 101, and the first control end 100 reception control signal STV0, and each first output terminal 102 connects with corresponding sweep trace 20, for this sweep trace 20 input control signal STV0.Second switch element 11 comprises the second control end 110, second input end 111 and the second output terminal 113, second control end 110 is connected with the first control end 100 of the first on-off element 10, and receive this control signal STV0, second input end 111 is connected with data line 21, and the second output terminal 113 is connected with public electrode 23.Wherein, when the normal display frame of display panel, control signal STV0 is low level; When display panel power-off, control signal STV0 saltus step is high level.
In an embodiment of the present invention, first on-off element 10 is field effect transistor with second switch element 11, first control end 100 and second control end 110 of second switch element 11 of the first on-off element 10 are the grid of field effect transistor, first input end 101 and second input end 111 of second switch element 11 of the first on-off element 10 are the source electrode of field effect transistor, and the first output terminal 102 and second output terminal 113 of second switch element 11 of the first on-off element 10 are the drain electrode of field effect transistor.In other embodiments, first input end 101 and second input end 111 of second switch element 11 of the first on-off element 10 can be the drain electrode of field effect transistor, and the first output terminal 102 of the first on-off element 10 and the second output terminal 113 of second switch element 11 can be the source electrode of field effect transistor.
Certainly it will be understood by those skilled in the art that, first on-off element 10 and second switch element 11 can also be other the electronic component with on-off action, such as triode, then the first control end 100 of the first on-off element 10 and the second control end 110 of second switch element 11 are the base stage of triode, first input end 101 and second input end 111 of second switch element 11 of the first on-off element 10 are the emitter of triode, first output terminal 102 and second output terminal 113 of second switch element 11 of the first on-off element 10 are the collector of triode.
Display panel of the present invention utilizes the cls work of the first on-off element 10, second switch element 11 and control signal STV0 co-controlling display panel.Particularly, please also refer to Fig. 1 and Fig. 2, Fig. 2 is the work schedule schematic diagram of the display device of one embodiment of the invention.As shown in Figure 2, control signal STV0 is a pulse signal, and the grid that the time that the high level of its pulse continues meets the pixel switch element 220 of all pixel cells 22 on display panel is all opened the time used.In the present embodiment, this control signal STV0 is pre-defined by source electrode drive circuit 4.
Wherein, in the normal display stage of display panel, the power supply signal VCI inputing to source electrode drive circuit 4 is high level, now the builtin voltage VGH of source electrode drive circuit 4 is high level, and source electrode drive circuit 4 exports one for low level control signal STV0, now, the first on-off element 10 all ends with second switch element 11, the gate driver circuit 3 of display panel carries gate drive signal to sweep trace 20, is opened with the grid of the pixel switch element 220 making respective pixel unit 22; And when the grid of pixel switch element 220 is opened, source electrode drive circuit 4 carries data-signal to every bar data line 21, with this, data-signal is sent in corresponding pixel cell 22, thus makes the normal display frame of display panel.
When display panel voltage source normally close or suddenly power-off time, display due to previous frame picture makes each pixel cell 22 all remain the current potential of display previous frame picture and leave ghost, therefore residually carries out cls action in requisition for display panel to eliminate this.In the cls stage of display panel, due to power-off, the input power signal VCI now inputing to source electrode drive circuit 4 becomes ground level GND, and common electric voltage Vcom also becomes ground level GND, and the builtin voltage VGH of source electrode drive circuit 4 also becomes ground level GND simultaneously.When source electrode drive circuit 4 detects that input power signal VCI becomes ground level GND, its export control signal STV0 by low transition to high level, and then make the first on-off element 10 conducting, first output terminal 102 of the first on-off element 10 exports control signal STV0 to every bar sweep trace 20, opens the pixel switch element 220 of all pixel cells 22 that every bar sweep trace 20 is expert at; Simultaneously, because control signal STV0 saltus step is high level, therefore second switch element 11 also conducting, the data line 21 that the public electrode 23 that second output terminal 113 of second switch element 11 is connected is connected with the second input end 111 is connected, therefore each pixel cell 22 all discharges into public electrode 23, makes display panel complete the action of cls.
In addition, because the gate driver circuit 3 on display panel, source electrode drive circuit 4 etc. can not work long hours in the absence of a power supply, therefore, after display panel completes the action of cls, the high level signal of source electrode drive circuit 4 becomes ground level GND and all keeps ground voltage with the control signal STV0 exported by source electrode drive circuit 4.
In other embodiments, this control signal STV0 also can be pre-defined by gate driver circuit 3 and export to cls circuit 1.
Display device of the present invention increases cls circuit 1, control signal STV0 is adopted to control the closed of the first on-off element 10 and second switch element 11 in the cls stage, and then control grid closed of the pixel switch element 220 in display panel all pixel cells 22, each pixel cell 22 is made to be discharged to public electrode 23, thus complete the cls of display panel, effectively can not only remove ghost, and structure is simple and cost is low.
Apply specific case herein to set forth cls circuit of the present invention, display device and embodiment, the explanation of above embodiment just understands method of the present invention and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications, to sum up, this description should not be construed as limitation of the present invention.
Claims (10)
1. a cls circuit, for eliminating the power-off ghost shadow of display panel, is characterized in that, this cls circuit comprises:
Multiple first on-off element, each first on-off element comprises the first control end, first input end and the first output terminal, this first control end is connected with this first input end, and reception control signal, this first output terminal each connects, for inputting this control signal to this sweep trace with a corresponding sweep trace of this display panel; And
Multiple second switch element, each second switch element comprises the second control end, the second input end and the second output terminal, this second control end receives this control signal, this second input end each connects with a corresponding data line of this display panel, and this second output terminal is connected with the public electrode of this display panel;
Wherein, when the normal display frame of this display panel, this control signal is low level; When this display panel power-off, control signal saltus step is high level.
2. cls circuit as claimed in claim 1, it is characterized in that, this control signal is exported by source electrode drive circuit.
3. cls circuit as claimed in claim 1, it is characterized in that, this control signal is exported by gate driver circuit.
4. cls circuit as claimed in claim 1, it is characterized in that, the plurality of first on-off element and the plurality of second switch element are field effect transistor.
5. cls circuit as claimed in claim 4, it is characterized in that, this first control end and this second control end are grid, and this first input end and this second input end are source electrode, and this first output terminal and this second output terminal are drain electrode.
6. a display device, is characterized in that, this display device comprises:
Pel array, the pixel switch element that this pel array comprises multi-strip scanning line, a plurality of data lines and is electrically connected with this multi-strip scanning line and this plurality of data lines;
Source electrode drive circuit, this source electrode drive circuit and this plurality of data lines are electrically connected;
Gate driver circuit, this gate driver circuit and this multi-strip scanning line are electrically connected; And
Cls circuit, wherein cls circuit comprises:
Multiple first on-off element, each first on-off element comprises the first control end, first input end and the first output terminal, this first control end is connected with this first input end, and reception control signal, this first output terminal each connects, for inputting this control signal to this sweep trace with corresponding this sweep trace of this display panel; And
Multiple second switch element, each second switch element comprises the second control end, the second input end and the second output terminal, this second control end receives this control signal, this second input end each connects with corresponding this data line of this display panel, and this second output terminal is connected with the public electrode of this display panel;
Wherein, when the normal display frame of this display panel, this control signal is low level; When this display panel power-off, control signal saltus step is high level.
7. display device as claimed in claim 6, it is characterized in that, this control signal is exported by source electrode drive circuit.
8. display device as claimed in claim 6, it is characterized in that, this control signal is exported by gate driver circuit.
9. display device as claimed in claim 6, it is characterized in that, the plurality of first on-off element and the plurality of second switch element are field effect transistor.
10. display device as claimed in claim 6, it is characterized in that, this first control end and this second control end are grid, and this first input end and this second input end are source electrode, and this first output terminal and this second output terminal are drain electrode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510069778.2A CN104616615B (en) | 2015-02-10 | 2015-02-10 | Cls circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510069778.2A CN104616615B (en) | 2015-02-10 | 2015-02-10 | Cls circuit and display device |
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| CN104616615A true CN104616615A (en) | 2015-05-13 |
| CN104616615B CN104616615B (en) | 2017-07-18 |
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| CN201510069778.2A Active CN104616615B (en) | 2015-02-10 | 2015-02-10 | Cls circuit and display device |
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| CN108364616A (en) * | 2018-02-28 | 2018-08-03 | 京东方科技集团股份有限公司 | Array substrate, display panel, display device and its driving method |
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| 2015-06-10 | C10 | Entry into substantive examination | |
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| 2017-07-18 | GR01 | Patent grant | |
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| 2019-12-24 | CP01 | Change in the name or title of a patent holder | |
| 2019-12-24 | CP01 | Change in the name or title of a patent holder |
Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee after: InfoVision Optoelectronics(Kunshan)Co.,Ltd. Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Patentee before: INFOVISION OPTOELECTRONICS (KUNSHAN) Co.,Ltd. |