CN101344691A - Image element circuit, plane display device and drive method of image element circuit - Google Patents
Image element circuit, plane display device and drive method of image element circuit Download PDFInfo
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- CN101344691A CN101344691A CNA2007101364429A CN200710136442A CN101344691A CN 101344691 A CN101344691 A CN 101344691A CN A2007101364429 A CNA2007101364429 A CN A2007101364429A CN 200710136442 A CN200710136442 A CN 200710136442A CN 101344691 A CN101344691 A CN 101344691A
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Abstract
The invention discloses a pixel circuit, a flat panel display and a driving method used for the pixel circuit; wherein, the pixel circuit comprises a first switch and a second switch. A first terminal of the first switch receives a data signal and a control terminal receives a first scanning signal. A first terminal of the second switch is coupled with a second terminal of the first switch and a second terminal is coupled with the first terminal of the second switch and a pixel capacitance and the control terminal receives a second scanning signal. The flat panel display comprises a data drive unit, a scanning drive unit and a pixel circuit including the above parts. The driving method used for the pixel circuit is as follows: after the first switch is checked by the first scanning signal, the second switch is opened by the second scanning signal to lead the channel charge flowing to the pixel capacitance from the first switch to be stored in the second switch. With the invention, the flicker of the flat panel display can be reduced so as to enhance the display quality.
Description
Technical field
The invention relates to the driving method of a kind of image element circuit, flat-panel screens and image element circuit, and particularly relevant for a kind of display packing of improving image element circuit, flat-panel screens and the image element circuit of scintillation.
Background technology
In film liquid crystal display (TFT-LCD), when the transistor in the image element circuit was cut off, the channel charge in the transistor had half can be drained into pixel capacitance approximately, had therefore influenced the voltage quasi position of pixel capacitance.This phenomenon is called as feed-in and penetrates (feed through) or electric charge injection (charge injection), can cause the positive and negative half period of liquid crystal molecule when picture shows to have different pressure drops respectively usually, causes the film liquid crystal display film flicker.
The way that tradition solves is to adopt the mode of utilizing manpower to adjust reference voltage (Vcom), makes the positive and negative half period of liquid crystal molecule when picture shows have identical pressure drop, to solve the problem of film liquid crystal display film flicker.Yet, when the panel of film liquid crystal display is the small size panel, utilize the manpower adjustment cost that reference voltage spent too high.And when the panel of film liquid crystal display is large size panel, because the existence of capacitance-resistance sluggishness (RC delay) effect, the feed-in penetration effect difference that diverse location produced on the large size panel can't be by adjusting the problem that reference voltage solves film flicker.
In addition, when data line write voltage not simultaneously, can make the channel charge amount difference that transistor in the image element circuit has, so the feed-in penetration effect that transistor is caused when being cut off is also different.Please refer to Fig. 1, it illustrates the synoptic diagram into the feed-in reach throught voltage of conventional pixel circuit.Because of data line write the voltage difference, can cause film flicker, and this problem can't be resolved by adjusting reference voltage.
Summary of the invention
The present invention is a kind of image element circuit, flat-panel screens and the driving circuit thereof that provides for the problems referred to above of prior art existence, can be by extra transistor and sweep trace, to reduce the phenomenon of picture flicker of flat-panel screens.
According to purpose of the present invention, the present invention proposes a kind of image element circuit, comprises first switch and second switch.First termination of first switch is received a data-signal, and control end receives one first sweep signal.First end of second switch is coupled to second end of first switch, and second end is coupled to first end and a pixel capacitance of second switch, and control end receives one second sweep signal.Second switch has similar capacitance-voltage curve characteristic to first switch.Wherein, after first sweep signal is ended first switch, the second sweep signal conducting second switch, the channel charge that makes the switch of winning flow to pixel capacitance is stored in second switch.
According to purpose of the present invention, the present invention proposes a kind of flat-panel screens, comprises data-driven unit, scan drive cell and image element circuit.The data-driven unit provides a data-signal.Scan drive cell provides one first sweep signal and one second sweep signal.
Image element circuit comprises first switch and second switch.First termination of first switch is received data-signal, and control end receives first sweep signal.First end of second switch is coupled to second end of first switch, and second end is coupled to first end and a pixel capacitance of second switch, and control end receives second sweep signal.Second switch has similar capacitance-voltage curve characteristic to first switch.Wherein, behind first switch, second sweep signal is with the conducting second switch in first sweep signal, and the channel charge that makes the switch of winning flow to pixel capacitance is stored in second switch.
According to purpose of the present invention, the present invention proposes a kind of image element circuit driving method, image element circuit comprises one first switch and a second switch, second switch has similar capacitance-voltage curve characteristic to first switch, and the component size of described second switch is half of component size of described first switch, and first end system of second switch is coupled to second end of second switch.The method comprises, at first, ends first switch.Afterwards, the conducting second switch, the channel charge that makes the switch of winning flow to a pixel capacitance is stored in second switch.
The present invention can reduce the phenomenon of picture flicker of flat-panel screens owing to adopted above technical scheme, promotes the display quality of flat-panel screens.
Description of drawings
For foregoing of the present invention can be become apparent, below especially exemplified by a preferred embodiment, and cooperate appended graphicly, be described in detail below.Wherein:
Fig. 1 illustrates the synoptic diagram into the feed-in reach throught voltage of conventional pixel circuit.
Fig. 2 illustrates and is the synoptic diagram according to the flat-panel screens of preferred embodiment of the present invention.
Fig. 3 A illustrates and is the sectional view according to the top grid structure of an embodiment of the image element circuit 230 of preferred embodiment of the present invention.
Fig. 3 B illustrates and is the sectional view according to the bottom-gate structure of another embodiment of the image element circuit 230 of preferred embodiment of the present invention.
Fig. 4 illustrates and is the sequential chart according to the sweep signal of the flat-panel screens 200 of preferred embodiment of the present invention.
Fig. 5 illustrates the oscillogram into an embodiment of transistorized capacitance-voltage curve.
Fig. 6 illustrates and is the synoptic diagram according to the feed-in reach throught voltage of the image element circuit of preferred embodiment of the present invention.
The main element symbol description is as follows among the figure:
200: flat-panel screens
210: the data-driven unit
220: scan drive cell
230: image element circuit
Embodiment
The present invention proposes a kind of image element circuit, flat-panel screens and driving circuit thereof, by extra transistor and the sweep trace of increasing in image element circuit, to solve the feed-in penetration effect of image element circuit, reduce the phenomenon of picture flicker of flat-panel screens, promote the display quality of flat-panel screens.
Please refer to Fig. 2, it illustrates is synoptic diagram according to the flat-panel screens of preferred embodiment of the present invention.In Fig. 2, what flat-panel screens 200 was preferable for example is a semi-penetrating trans flat-panel screens or a reflective flat-panel screens, but does not limit.Flat-panel screens 200 comprises data-driven unit 210, scan drive cell 220 and a plurality of image element circuit, each image element circuit is coupled to data-driven unit 210 via a data line in fact, and is coupled to scan drive cell 220 via two sweep traces.Next be that example is done explanation with image element circuit 230, but be not limited to this.
The practical structures of image element circuit 230 can be with reference to Fig. 3 A and Fig. 3 B, it is sectional view according to the top grid structure of an embodiment of the image element circuit 230 of preferred embodiment of the present invention that Fig. 3 A illustrates, and it is sectional view according to the bottom-gate structure of another embodiment of the image element circuit 230 of preferred embodiment of the present invention that Fig. 3 B illustrates.
Because the first switch M1 has similar capacitance-voltage curve characteristic to second switch M2, therefore the first switch M1 and second switch M2 must be nmos pass transistor or be the PMOS transistor.Next being nmos pass transistor with the first switch M1 and second switch M2 is that example is done explanation.Please refer to Fig. 4, it illustrates is sequential chart according to the sweep signal of the flat-panel screens 200 of preferred embodiment of the present invention.At time t0, the voltage quasi position of the first sweep signal Scan1 is the accurate position of high voltage, and the first switch M1 is switched on.At this moment, the voltage quasi position of the second sweep signal Scan2 is the accurate position of low-voltage, and second switch M2 is cut off.Yet because first end of second switch M2 is second end that is coupled to second switch M2, so data-signal Data is able to via the first switch M1 of conducting and the second switch M2 of short circuit pixel capacitance Cs be charged to a corresponding voltage quasi position.
At time t1, the voltage quasi position of the first sweep signal Scan1 becomes the accurate position of low-voltage, and the first switch M1 is cut off.At this moment, the channel charge that had when conducting state of the first switch M1 begins to be released.Wherein, only about half of channel charge can flow to data line, and remaining channel charge can flow to second switch M2.For the channel charge of avoiding flowing to second switch M2 can flow to the voltage quasi position that pixel capacitance Cs influences pixel capacitance Cs via the second switch M2 of short circuit, therefore at time t2, the voltage quasi position of the second sweep signal Scan2 becomes the accurate position of high voltage, and second switch M2 is switched on.
When second switch M2 was switched on, the first switch M1 discharged and flows to the conducting of the channel charge meeting of second switch M2 because of second switch M2, and is stored in the passage of second switch M2.Thus, the channel charge that the first switch M1 is discharged can not flow to pixel capacitance Cs, that is can not influence the voltage quasi position of pixel capacitance Cs.At time t3, the voltage quasi position of the first sweep signal Scan1 becomes the accurate position of high voltage, and data-signal Data begins pixel capacitance Cs is charged to another corresponding voltage level via the first switch M1 of conducting and the second switch M2 of conducting.At time t4, the voltage quasi position of the second sweep signal Scan2 becomes the accurate position of low-voltage, and second switch M2 carries and ends.At this moment, because data-signal Data is still in the pixel capacitance Cs charging, so the channel charge that second switch M2 is discharged can not influence the last voltage quasi position of pixel capacitance Cs.
Please refer to Fig. 5, it illustrates the oscillogram of an embodiment who is transistorized capacitance-voltage curve.Wherein, the transistor in the image element circuit (the first switch M1 or second switch M2) by conducting change into by the time channel charge that discharged, be equivalent to the area under the capacitance-voltage curve in fact.Because the first switch M1 and second switch M2 have similar capacitance-voltage curve characteristic, and the channel charge that second switch M2 institute desire stores is about channel charge that the first switch M1 discharged half, so the component size of second switch M2 is designed to be about half of component size of the first switch M1, make its can suitably mend catch the first switch M1 by the time channel charge that discharged.
In addition,, therefore can utilize identical process conditions, critical voltage or other parameter variations that produces because of processing procedure compensated, make the phenomenon of flicker reduce to the lightest because the first switch M1 and second switch M2 are nmos pass transistor or PMOS transistor.Moreover, discharge and flow to the channel charge of pixel capacitance Cs because second switch M2 has caught the first switch M1, so solved the different problem of different pieces of information signal feed-in reach throught voltage.Please refer to Fig. 6, it illustrates and is the synoptic diagram according to the feed-in reach throught voltage of the image element circuit of preferred embodiment of the present invention.By observing among Fig. 6, correspond to different data-signals, the feed-in reach throught voltage of image element circuit is all minimum.Further, when the panel of flat-panel screens 200 is large size panel, it is close to be designed to load in order to two sweep traces that transmit the first sweep signal Scan1 and the second sweep signal Scan2, can make compensation to the capacitance-resistance hesitation thus, reduces the generation of scintillation.
The disclosed image element circuit of the above embodiment of the present invention, flat-panel screens and driving circuit thereof, in conventional pixel circuit, increase second switch and new sweep trace, do the action of compensation near anti-phase second sweep signal by second switch and with first sweep signal, the channel charge that first switch is discharged when ending is stored in second switch, make the voltage quasi position of pixel capacitance can not be affected, and then the phenomenon of picture flicker of minimizing flat-panel screens, the display quality of lifting flat-panel screens.
In sum, though the present invention discloses as above with a preferred embodiment, so it is not in order to limit the present invention.The technical staff in the technical field of the invention, without departing from the spirit and scope of the present invention, when being used for a variety of modifications and variations.Therefore, protection scope of the present invention is as the criterion with the scope that claims were defined.
Claims (10)
1. an image element circuit is characterized in that, comprising:
One first switch, first termination of described first switch is received a data-signal, and the control end of described first switch receives one first sweep signal; And
One second switch, first end of described second switch is coupled to second end of described first switch, second end of described second switch is coupled to first end and a pixel capacitance of described second switch, the control end of described second switch receives one second sweep signal, and described second switch has similar capacitance-voltage curve characteristic to described first switch;
Wherein, after described first sweep signal is ended described first switch, the described second switch of the described second sweep signal conducting, the channel charge that makes described first switch flow to described pixel capacitance is stored in described second switch.
2. image element circuit as claimed in claim 1 is characterized in that, the phase differential of described first sweep signal and described second sweep signal is greater than 180 °.
3. image element circuit as claimed in claim 1 is characterized in that, the component size of described second switch is half of component size of described first switch.
4. image element circuit as claimed in claim 1, it is characterized in that, behind described first switch of the described first sweep signal conducting, described second sweep signal makes described data-signal be sent to described pixel capacitance via described first switch of conducting and the described second switch of short circuit by described second switch.
5. a flat-panel screens is characterized in that, comprising:
One data-driven unit is in order to provide a data-signal;
The one scan driver element is in order to provide one first sweep signal and one second sweep signal; And
One image element circuit comprises:
One first switch, first termination of described first switch is received described data-signal, and the control end of described first switch receives described first sweep signal; And
One second switch, first end of described second switch is coupled to second end of described first switch, second end of described second switch is coupled to first end and a pixel capacitance of described second switch, the control end of described second switch receives described second sweep signal, and described second switch has similar capacitance-voltage curve characteristic to described first switch;
Wherein, after described first sweep signal is ended described first switch, the described second switch of the described second sweep signal conducting, the channel charge that makes described first switch flow to described pixel capacitance is stored in described second switch.
6. flat-panel screens as claimed in claim 5 is characterized in that, the phase differential of described first sweep signal and described second sweep signal is greater than 180 °.
7. flat-panel screens as claimed in claim 5 is characterized in that, described in the component size of second switch be half of component size of described first switch.
8. flat-panel screens as claimed in claim 5, it is characterized in that, behind described first switch of the described first sweep signal conducting, described second sweep signal makes described data-signal be sent to described pixel capacitance via described first switch of conducting and the described second switch of short circuit by described second switch.
9. image element circuit driving method, it is characterized in that, described image element circuit comprises one first switch and a second switch, described second switch has similar capacitance-voltage curve characteristic to described first switch, first end of described second switch is coupled to second end of described second switch, and the component size of described second switch is half of component size of described first switch; Described method comprises:
By described first switch; And
The described second switch of conducting, the channel charge that makes described first switch flow to a pixel capacitance is stored in described second switch.
10. image element circuit driving method as claimed in claim 9 is characterized in that, also comprises:
Described first switch of conducting; And
By described second switch, make a data-signal be sent to described pixel capacitance via described first switch of conducting and the described second switch of short circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101364429A CN101344691B (en) | 2007-07-12 | 2007-07-12 | Pixel circuit, flat panel display and driving method for pixel circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101364429A CN101344691B (en) | 2007-07-12 | 2007-07-12 | Pixel circuit, flat panel display and driving method for pixel circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101344691A true CN101344691A (en) | 2009-01-14 |
| CN101344691B CN101344691B (en) | 2012-04-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2007101364429A Expired - Fee Related CN101344691B (en) | 2007-07-12 | 2007-07-12 | Pixel circuit, flat panel display and driving method for pixel circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107958653A (en) * | 2016-10-18 | 2018-04-24 | 京东方科技集团股份有限公司 | Array base palte and its driving method, drive circuit and display device |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001075127A (en) * | 1999-09-03 | 2001-03-23 | Matsushita Electric Ind Co Ltd | Active matrix type liquid crystal display element and its manufacturing method |
| EP1229379A3 (en) * | 2001-01-31 | 2007-02-07 | Matsushita Electric Industrial Co., Ltd. | Active matrix liquid crystal display element |
| US6897908B2 (en) * | 2001-11-23 | 2005-05-24 | Chi Mei Optoelectronics Corporation | Liquid crystal display panel having reduced flicker |
| CN1324384C (en) * | 2003-06-02 | 2007-07-04 | 友达光电股份有限公司 | Liquid crystal display and its internal sampling circuit |
| TWI287684B (en) * | 2005-05-11 | 2007-10-01 | Chunghwa Picture Tubes Ltd | Thin film transistor array |
| CN1987620B (en) * | 2005-12-23 | 2010-05-12 | 群康科技(深圳)有限公司 | Liquid crystal display and its compensating feed through voltage method |
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2007
- 2007-07-12 CN CN2007101364429A patent/CN101344691B/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107958653A (en) * | 2016-10-18 | 2018-04-24 | 京东方科技集团股份有限公司 | Array base palte and its driving method, drive circuit and display device |
| US10453413B2 (en) | 2016-10-18 | 2019-10-22 | Boe Technology Group Co., Ltd. | Array substrate and driving method, driving circuit, and display apparatus |
| CN107958653B (en) * | 2016-10-18 | 2021-02-02 | 京东方科技集团股份有限公司 | Array substrate, driving method thereof, driving circuit and display device |
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| CN101344691B (en) | 2012-04-04 |
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Effective date of registration: 20120208 Address after: Taiwan, China 350 Hsinchu science and Technology Industrial Park, Miaoli County, Southern Town, science Road, No. 160 Applicant after: Chimei Optoelectronics Co., Ltd. Address before: China Taiwan 74144 Tainan County Tainan Science Industrial Park odd Road No. 1 Applicant before: Chimei Optoelectronics Co., Ltd. |
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Granted publication date: 20120404 Termination date: 20130712 |