CN103869515A - Alternating current driving method of liquid crystal materials - Google Patents
Alternating current driving method of liquid crystal materials Download PDFInfo
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- CN103869515A CN103869515A CN201310722934.1A CN201310722934A CN103869515A CN 103869515 A CN103869515 A CN 103869515A CN 201310722934 A CN201310722934 A CN 201310722934A CN 103869515 A CN103869515 A CN 103869515A
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- liquid crystal
- control signal
- driving method
- switching tube
- signal end
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Abstract
The invention discloses an alternating current driving method of liquid crystal materials based on the alternating current driving of a liquid crystal display pixel basic unit, and belongs to the technical field of liquid crystal displaying. The liquid crystal display pixel basic unit comprises a switch tube, a storage capacitor and a liquid crystal capacitor, wherein a data signal end is respectively connected with the storage capacitor and one end of the liquid crystal capacitor through the switch tube; the other end of the storage capacitor is connected with a control signal end; the other end of the liquid crystal capacitor is connected with a common electrode; a grid electrode of the switch tube is connected with a scanning signal end. The alternating current driving method of the liquid crystal materials comprises the steps: negative polarity control: the control signal end outputs a high level when the scanning signal drives the switch tube to be conducted, and when the scanning signal drives the switch tube to be switched off, the control signal end outputs a low level; positive polarity control: when the scanning signal drives the switch tube to be conducted or switched off, the control signal end outputs the high level; and the signal of the common signal is constant. According to the method, the complexity of a peripheral circuit is simplified.
Description
Technical field
The present invention relates to liquid crystal pictorial display technical field, particularly a kind of liquid crystal material AC driving method.
Background technology
Liquid crystal is a kind of particular matter between solid and liquid, and it belongs to organic compound, be in a liquid state under normal conditions, but its molecules align is the same with solid crystal fairly regular.The principle of work of liquid crystal display is, if apply an electric field to liquid crystal, can change its molecules align, gives its matching polarized light sheet simultaneously, and it just can change the throughput of light.The voltage that briefly changes liquid crystal two ends just can change its penetrability, thereby controls the variation that shows light and shade.This electric field produces by the electric potential signal on two electrodes before and after display pixel is synthetic, on display pixel, setting up DC electric field is piece of cake, but DC electric field will cause chemical reaction and the ageing of electrode of liquid crystal material, thereby reduce rapidly the display life of liquid crystal.Briefly, because liquid crystal molecule has a specific character, it can not to be fixed on some voltage constant always, if like this through after a while, even voltage is canceled, liquid crystal molecule can be because the destruction of characteristic, and cannot rotate with the variation of electric field again, form different GTGs to control.So at set intervals, just voltage must be restored to the original state, be destroyed with the characteristic of avoiding liquid crystal molecule.Therefore in order to reduce the destruction of DC electric field to liquid crystal molecule characteristic, need to set up interchange and drive electric field.
Set up at present the mode that drives liquid crystal material AC field, the conventional public electrode that has liquid crystal material is the variation with pulse voltage every a frame, i.e. a vertical frame dimension, positive polarity; One frame is low, negative polarity; The digital signal of input is done negate processing simultaneously; Another is that the public electrode of liquid crystal material remains unchanged, and the data of input are with row upset or with the variation of field upset.
Conventional two kinds exchange type of drive and all need the video data signal of input to do corresponding processing or require larger input data voltage range; Therefore increased the complexity of peripheral drive circuit design.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of liquid crystal material that can reduce and exchanges the liquid crystal material video picture AC driving method that drives periphery circuit design complexity.
For solving the problems of the technologies described above, the invention provides a kind of liquid crystal material AC driving method, the interchange based on liquid crystal display pixel elementary cell drives; Described liquid crystal display pixel elementary cell comprises: switching tube M
1, memory capacitance C
sand liquid crystal capacitance C
lC; Data-signal end Data is by described switching tube M
1respectively with described memory capacitance C
sand described liquid crystal capacitance C
lCone end be connected; Described memory capacitance C
sthe other end and control signal end V
cbe connected; Described liquid crystal capacitance C
lCthe other end connect public electrode V
cOM; Described switching tube M
1grid and scan control signal end S
cANbe connected; Described liquid crystal material AC driving method comprises: negative polarity control, and as sweep signal S
cANdrive described switching tube M
1when conducting, described control signal end V
coutput high level; As sweep signal S
cANdrive described switching tube M
1when shutoff, described control signal end V
coutput low level; Positive polarity control, as sweep signal S
cANdrive described switching tube M
1when conducting or shutoff, described control signal end V
call export high level; The signal of described public electrode is constant all the time.
Further, described sweep signal S
cANfor line scanning control signal.
Further, described positive polarity control and described negative polarity control hocket.
Further, described control signal Data end high level is 5V, and low level is 0V.
Liquid crystal material AC driving method provided by the invention, is different from traditional AC driving method at public electrode V
cOMend applies the mode of control signal and then entirety control, memory capacitance end by the liquid crystal display pixel elementary cell separate applies control signal, control for single display pixel elementary cell, under the prerequisite that does not affect video picture, avoid the operation of the voltage range that increases input data, and then simplified the design of peripheral drive circuit.
Brief description of the drawings
The liquid crystal display pixel basic cell structure schematic diagram that Fig. 1 provides for the embodiment of the present invention;
The liquid crystal display pixel elementary cell negative polarity control schematic diagram that Fig. 2 provides for the embodiment of the present invention;
The liquid crystal display pixel elementary cell positive polarity control schematic diagram that Fig. 3 embodiment of the present invention provides.Embodiment
Referring to Fig. 1, the syndeton schematic diagram of the liquid crystal display pixel basic cell structure that the embodiment of the present invention provides, liquid crystal display pixel elementary cell comprises: switching tube M
1, memory capacitance C
sand liquid crystal capacitance C
lC; Data-signal end D
ataby switching tube M
1respectively with memory capacitance C
sand liquid crystal capacitance C
lCone end be connected, store data in memory capacitance C
son; Memory capacitance C
sthe other end and control signal end V
cbe connected, be different from the way of ground connection in classic method, the operation of carrying executing data upset; Liquid crystal capacitance C
lCthe other end connect public electrode V
cOM, remain that voltage signal is constant, be different from the role positioning that carries data reversal operation in classic method; Switching tube M
1grid and scan control signal end S
cANbe connected, the break-make of gauge tap pipe, coordinates executing data to write.The AC driving method that above-mentioned annexation proposes based on the present embodiment, adopts the independently mode of memory capacitance of controlling to substitute the overall mode of controlling public electrode.
Referring to Fig. 2 and Fig. 3, the liquid crystal material AC driving method that the present embodiment proposes comprises:
Negative polarity control, as sweep signal S
cANdriving switch pipe M
1when conducting, control signal end V
coutput high level 5V, by data V
datawrite and be stored on electric capacity; As sweep signal S
cANdriving switch pipe M
1when shutoff, control signal end V
coutput low level 0V, in view of liquid crystal capacitance C
lCbe far smaller than memory capacitance C
s; According to capacitance charge conservation principle, the magnitude of voltage being now stored on electric capacity is V
data-5, complete Data flipping, complete negative polarity control.
Positive polarity control, as sweep signal S
cANdrive described switching tube M
1when conducting or shutoff, control signal end V
call export high level 5V, complete positive polarity control.
Positive polarity control and negative polarity control are alternately to carry out, and drive thereby realize exchanging.In interchange driving process, the output signal of public electrode is constant all the time.
The break-make of switching tube is by line scanning control signal S
cANcontrol, with data write and overturn realize coordinate.
The control signal V that the present embodiment provides
chigh level 5V and low level 0V; Mainly to utilize liquid crystal capacitance C
lCbe far smaller than memory capacitance C
s, and adopt capacitance charge conservation principle, control C
sthe variation of one terminal voltage, exchanges driving thereby realize liquid crystal material; Thereby the driving method that the present embodiment proposes is in keeping public electrode voltages signal to remain unchanged, and the data voltage range of input only need meet liquid crystal material working range, does not need increase, thereby simplify the design of peripheral circuit.In this method driving process, writing and wiping of data is all to carry out line by line simultaneously, and in public electrode control mode, the type of drive writing is line by line wiped in unification, and brightness is higher, and displaying time is longer, thus the quality that keeps imaging results to cross.
Liquid crystal material AC driving method provided by the invention, is different from traditional AC driving method at public electrode V
cOMend applies the mode of control signal and then entirety control, memory capacitance end by the liquid crystal display pixel elementary cell separate applies control signal, control for single display pixel elementary cell, under the prerequisite that does not affect video picture, avoid the operation of the voltage range that increases input data, and then simplified the design of peripheral drive circuit.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (4)
1. a liquid crystal material AC driving method, the interchange based on liquid crystal display pixel elementary cell drives; It is characterized in that, described liquid crystal display pixel elementary cell comprises: switching tube M
1, memory capacitance C
sand liquid crystal capacitance C
lC; Data-signal end D
ataby described switching tube M
1respectively with described memory capacitance C
sand described liquid crystal capacitance C
lCone end be connected; Described memory capacitance C
sthe other end and control signal end V
cbe connected; Described liquid crystal capacitance C
lCthe other end connect public electrode V
cOM; Described switching tube M
1grid and scan control signal end S
cANbe connected;
Described liquid crystal material AC driving method comprises:
Negative polarity control, as sweep signal S
cANdrive described switching tube M
1when conducting, described control signal end V
coutput high level; As sweep signal S
cANdrive described switching tube M
1when shutoff, described control signal end V
coutput low level;
Positive polarity control, as sweep signal S
cANdrive described switching tube M
1when conducting or shutoff, described control signal end V
call export high level;
The signal of described public electrode is constant all the time.
2. liquid crystal material AC driving method as claimed in claim 1, is characterized in that: described sweep signal S
cANfor line scanning control signal.
3. liquid crystal material AC driving method as claimed in claim 2, is characterized in that: described positive polarity control and described negative polarity control hocket.
4. liquid crystal material AC driving method as claimed in claim 3, is characterized in that: described control signal Data end high level is 5V, and low level is 0V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310722934.1A CN103869515A (en) | 2013-12-24 | 2013-12-24 | Alternating current driving method of liquid crystal materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310722934.1A CN103869515A (en) | 2013-12-24 | 2013-12-24 | Alternating current driving method of liquid crystal materials |
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| Publication Number | Publication Date |
|---|---|
| CN103869515A true CN103869515A (en) | 2014-06-18 |
Family
ID=50908227
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|---|---|---|---|
| CN201310722934.1A Pending CN103869515A (en) | 2013-12-24 | 2013-12-24 | Alternating current driving method of liquid crystal materials |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040108987A1 (en) * | 2002-12-04 | 2004-06-10 | Lg.Philips Lcd Co., Ltd. | System and method for reducing off-current in thin film transistor of liquid crystal display device |
| CN1598674A (en) * | 2003-09-18 | 2005-03-23 | 统宝光电股份有限公司 | Driving method and circuit for liquid crystal display |
| CN1941055A (en) * | 2005-09-29 | 2007-04-04 | 中华映管股份有限公司 | Shared voltage modification circuit and method |
| CN101256750A (en) * | 2007-02-28 | 2008-09-03 | Lg.菲力浦Lcd株式会社 | Method of driving liquid crystal display device |
| CN101369082A (en) * | 2008-10-16 | 2009-02-18 | 友达光电股份有限公司 | Pixel array, method for driving pixel array and display panel |
-
2013
- 2013-12-24 CN CN201310722934.1A patent/CN103869515A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040108987A1 (en) * | 2002-12-04 | 2004-06-10 | Lg.Philips Lcd Co., Ltd. | System and method for reducing off-current in thin film transistor of liquid crystal display device |
| CN1598674A (en) * | 2003-09-18 | 2005-03-23 | 统宝光电股份有限公司 | Driving method and circuit for liquid crystal display |
| CN1941055A (en) * | 2005-09-29 | 2007-04-04 | 中华映管股份有限公司 | Shared voltage modification circuit and method |
| CN101256750A (en) * | 2007-02-28 | 2008-09-03 | Lg.菲力浦Lcd株式会社 | Method of driving liquid crystal display device |
| CN101369082A (en) * | 2008-10-16 | 2009-02-18 | 友达光电股份有限公司 | Pixel array, method for driving pixel array and display panel |
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| ASS | Succession or assignment of patent right |
Owner name: BEIJING YANDONG MICROELECTRNIC CO.,LTD. Free format text: FORMER OWNER: INST OF MICROELECTRONICS, C. A. S Effective date: 20150702 |
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Effective date of registration: 20150702 Address after: 100015 Beijing city Chaoyang District Dongzhimen West eight room Wanhong No. 2 West Street Applicant after: Beijing Yandong Microelectronic Co., Ltd. Address before: 100029 Beijing city Chaoyang District Beitucheng West Road No. 3 Applicant before: Institute of Microelectronics, Chinese Academy of Sciences |
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Application publication date: 20140618 |