CN101344691B - 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
- Publication number
- CN101344691B CN101344691B CN2007101364429A CN200710136442A CN101344691B CN 101344691 B CN101344691 B CN 101344691B CN 2007101364429 A CN2007101364429 A CN 2007101364429A CN 200710136442 A CN200710136442 A CN 200710136442A CN 101344691 B CN101344691 B CN 101344691B
- Authority
- CN
- China
- Prior art keywords
- switch
- sweep signal
- image element
- element circuit
- signal
- 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.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
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 ended, 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 adjustment 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 was large size panel, because the existence of sluggish (RC delay) effect of capacitance-resistance, the feed-in penetration effect that diverse location produced on the large size panel was different, can't solve the problem of film flicker by the adjustment reference voltage.
In addition, when data line write voltage not simultaneously, the channel charge amount that can make transistor in the image element circuit have is different, thus transistor by by the time feed-in penetration effect that caused also different.Please with reference 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 the adjustment 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 the object of the 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 with 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 the object of the 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 with 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 the object of the 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 with first switch, and the component size of said second switch is component size half the of said 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 letting the foregoing of the present invention can be more obviously understandable, below specially lift a preferred embodiment, and cooperate appended graphicly, elaborate as follows.Wherein:
Fig. 1 illustrates the synoptic diagram into the feed-in reach throught voltage of conventional pixel circuit.
Fig. 2 illustrates the synoptic diagram into the flat-panel screens that accordings to preferred embodiment of the present invention.
Fig. 3 A illustrates the sectional view into the top grid structure of an embodiment of the image element circuit 230 of accordinging to preferred embodiment of the present invention.
Fig. 3 B illustrates the sectional view into the bottom-gate structure of another embodiment of the image element circuit 230 of accordinging to preferred embodiment of the present invention.
Fig. 4 illustrates the sequential chart into the sweep signal of the flat-panel screens 200 that accordings to preferred embodiment of the present invention.
Fig. 5 illustrates the oscillogram into an embodiment of transistorized capacitance-voltage curve.
Fig. 6 illustrates the synoptic diagram into the feed-in reach throught voltage of the image element circuit of accordinging to preferred embodiment of the present invention.
The main element symbol description is following 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 increase transistor and sweep trace 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 with reference to Fig. 2, it illustrates is the 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 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 that Fig. 3 A illustrates, and it 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 that Fig. 3 B illustrates.
Because the first switch M1 has similar capacitance-voltage curve characteristic with 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 with reference to Fig. 4, it illustrates is the 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 ended.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 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 ended.At this moment, the channel charge that when conducting state, had 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 with reference 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 the half the of channel charge that the first switch M1 discharged; So the component size of second switch M2 is designed to be about component size half the 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 different pieces of information signal feed-in reach throught voltage different problems.Please with reference to Fig. 6, it illustrates the synoptic diagram into the feed-in reach throught voltage of the image element circuit of accordinging to 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 image element circuit that the above embodiment of the present invention disclosed, flat-panel screens and driving circuit thereof; In conventional pixel circuit, increase second switch and new sweep trace; Do the action of compensation near second sweep signal of anti-phase 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 reduce the phenomenon of picture flicker of flat-panel screens, promote the display quality of 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.Those skilled in the art under the present invention are not breaking away from the spirit and scope of the present invention, when doing various changes and retouching.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 said first switch is received a data-signal, and the control end of said first switch receives one first sweep signal; And
One second switch; First end of said second switch is coupled to second end of said first switch; Second end of said second switch is coupled to first end and a pixel capacitance of said second switch; The control end of said second switch receives one second sweep signal, and said second switch has similar capacitance-voltage curve characteristic with said first switch;
Wherein, after said first sweep signal is ended said first switch, the said second switch of the said second sweep signal conducting, the channel charge that makes said first switch flow to said pixel capacitance is stored in said second switch.
2. image element circuit as claimed in claim 1 is characterized in that, the phase differential of said first sweep signal and said second sweep signal is greater than 180 °.
3. image element circuit as claimed in claim 1 is characterized in that, the component size of said second switch is component size half the of said first switch.
4. image element circuit as claimed in claim 1; It is characterized in that; Behind said first switch of the said first sweep signal conducting; Said second sweep signal makes said data-signal be sent to said pixel capacitance via said first switch of conducting and the said second switch of short circuit by said 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 said first switch is received said data-signal, and the control end of said first switch receives said first sweep signal; And
One second switch; First end of said second switch is coupled to second end of said first switch; Second end of said second switch is coupled to first end and a pixel capacitance of said second switch; The control end of said second switch receives said second sweep signal, and said second switch has similar capacitance-voltage curve characteristic with said first switch;
Wherein, after said first sweep signal is ended said first switch, the said second switch of the said second sweep signal conducting, the channel charge that makes said first switch flow to said pixel capacitance is stored in said second switch.
6. flat-panel screens as claimed in claim 5 is characterized in that, the phase differential of said first sweep signal and said second sweep signal is greater than 180 °.
7. flat-panel screens as claimed in claim 5 is characterized in that, the component size of said second switch is component size half the of said first switch.
8. flat-panel screens as claimed in claim 5; It is characterized in that; Behind said first switch of the said first sweep signal conducting; Said second sweep signal makes said data-signal be sent to said pixel capacitance via said first switch of conducting and the said second switch of short circuit by said second switch.
9. image element circuit driving method; It is characterized in that; Said image element circuit comprises one first switch and a second switch; First termination of said first switch is received a data-signal, and the control end of said first switch receives one first sweep signal, and second end of said second switch is coupled to first end and a pixel capacitance of said second switch; The control end of said second switch receives one second sweep signal; Said second switch has similar capacitance-voltage curve characteristic with said first switch, and first end of said second switch is coupled to second end of said first switch, and the component size of said second switch is component size half the of said first switch; Said method comprises:
By said first switch; And
The said second switch of conducting, the channel charge that makes said first switch flow to a pixel capacitance is stored in said second switch.
10. image element circuit driving method as claimed in claim 9 is characterized in that, also comprises:
Said first switch of conducting; And
By said second switch, make a data-signal be sent to said pixel capacitance via said first switch of conducting and the said second switch of short circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101364429A CN101344691B (en) | 2007-07-12 | 2007-07-12 | Image element circuit, plane display device and drive method of image element circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101364429A CN101344691B (en) | 2007-07-12 | 2007-07-12 | Image element circuit, plane display device and drive method of image element circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101344691A CN101344691A (en) | 2009-01-14 |
| CN101344691B true CN101344691B (en) | 2012-04-04 |
Family
ID=40246712
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101364429A Expired - Fee Related CN101344691B (en) | 2007-07-12 | 2007-07-12 | Image element circuit, plane display device and drive method of image element circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101344691B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1287287A (en) * | 1999-09-03 | 2001-03-14 | 松下电器产业株式会社 | Active matrix liquid crystal display element and its producing method |
| CN1375734A (en) * | 2001-01-31 | 2002-10-23 | 松下电器产业株式会社 | Active matrix liquid crystal display element |
| CN1553268A (en) * | 2003-06-02 | 2004-12-08 | 友达光电股份有限公司 | Liquid-crystal displaying device and its internal sampling circuit |
| US6897908B2 (en) * | 2001-11-23 | 2005-05-24 | Chi Mei Optoelectronics Corporation | Liquid crystal display panel having reduced flicker |
| GB2426113A (en) * | 2005-05-11 | 2006-11-15 | Chunghwa Picture Tubes Ltd | Thin film transistor array |
| CN1987620A (en) * | 2005-12-23 | 2007-06-27 | 群康科技(深圳)有限公司 | Liquid crystal display and its compensating feed through voltage method |
-
2007
- 2007-07-12 CN CN2007101364429A patent/CN101344691B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1287287A (en) * | 1999-09-03 | 2001-03-14 | 松下电器产业株式会社 | Active matrix liquid crystal display element and its producing method |
| CN1375734A (en) * | 2001-01-31 | 2002-10-23 | 松下电器产业株式会社 | 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 |
| CN1553268A (en) * | 2003-06-02 | 2004-12-08 | 友达光电股份有限公司 | Liquid-crystal displaying device and its internal sampling circuit |
| GB2426113A (en) * | 2005-05-11 | 2006-11-15 | Chunghwa Picture Tubes Ltd | Thin film transistor array |
| CN1987620A (en) * | 2005-12-23 | 2007-06-27 | 群康科技(深圳)有限公司 | Liquid crystal display and its compensating feed through voltage method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101344691A (en) | 2009-01-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105096789B (en) | GOA tests the common circuit with removing power-off ghost shadow | |
| US8537095B2 (en) | Display apparatus and method of driving the same | |
| US11024245B2 (en) | Gate driver and display device using the same | |
| CN203895097U (en) | Circuit capable of eliminating shutdown ghost shadows and display device | |
| KR101931335B1 (en) | Level shifter for liquid crystal display | |
| US8063867B2 (en) | Liquid crystal display and method of driving the same | |
| US10510313B2 (en) | Driving circuit outputting a chamfered wave scanning signal, driving method and display apparatus | |
| US20170139295A1 (en) | Liquid crystal display panel with hot pixel being repaired and method for repairing hot pixel | |
| CN103137077B (en) | The method of the stable period of electrophoretic display apparatus and control electrophoretic display apparatus | |
| CN102610205A (en) | Feed-through voltage compensation circuit, liquid crystal display device and feed-through voltage compensation method | |
| CN101523474A (en) | Display device | |
| CN106128377B (en) | Liquid crystal display panel and pre-charge method, liquid crystal display device | |
| US20150262542A1 (en) | Pixel circuit of liquid crystal display and control method thereof | |
| US10345662B2 (en) | Array substrates and display panels | |
| CN108877610B (en) | Array substrate, detection method thereof and display device | |
| US20190213968A1 (en) | Array substrate, method for driving the same, and display apparatus | |
| CN105304054A (en) | Grid driving circuit with electrostatic discharge function and grid driving method | |
| CN102109692B (en) | Liquid crystal display panel and scanning line compensation circuit thereof | |
| US20010028337A1 (en) | Method of reducing flickering and inhomogeneous brightness in LCD | |
| US9928798B2 (en) | Method and device for controlling voltage of electrode | |
| CN101344691B (en) | Image element circuit, plane display device and drive method of image element circuit | |
| CN111754950A (en) | GOA circuit, display panel and display device | |
| CN109686330A (en) | A kind of pixel-driving circuit and its driving method | |
| CN202330945U (en) | Driving circuit, liquid crystal panel and liquid crystal display device | |
| CN104777932A (en) | Touch control liquid crystal display and touch control liquid crystal panel thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
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. |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120404 Termination date: 20130712 |