CN1941055A - Shared voltage modification circuit and method - Google Patents
Shared voltage modification circuit and method Download PDFInfo
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- CN1941055A CN1941055A CN 200510108104 CN200510108104A CN1941055A CN 1941055 A CN1941055 A CN 1941055A CN 200510108104 CN200510108104 CN 200510108104 CN 200510108104 A CN200510108104 A CN 200510108104A CN 1941055 A CN1941055 A CN 1941055A
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Abstract
This invention is a coordinating voltage corrector circuit and its working method. Coordinating voltage allows AC modulation and reduces power consumption. By use of metal insulation semi-conductor capacitance could reduce the cost and guarantee the accuracy of gray scale voltage. The character of this invention is that the capacitance is capable of outputting voltage to each pixel on film LCD according to pre-set and coordinating voltage. The output voltage and coordinating voltage are all AC voltage. Each LCD capacitance is linked to coordinating voltage. Output voltage and coordinating voltage are of the same phase and swing. The pre-set voltage value is equal to the difference of coordinating voltage and output voltage.
Description
Technical field
The present invention relates to a kind of film liquid crystal display (thin-film transistor liquidcrystal display that is used for, abbreviate TFT LCD as) common voltage (common voltage) correction circuit and method, and be particularly related to a kind of correction circuit and method that is used for revising the common voltage that exchanges (alternating current abbreviates AC as) modulation.
Background technology
The pixel of general film liquid crystal display (pixel) all comprises thin film transistor (TFT), storage capacitors and liquid crystal capacitance.If as storage capacitors, can reduce technology mask number, reduce manufacturing cost with metal dielectric layer semiconductor (metal-insulatorsemiconductor abbreviates MIS as) structure.
U.S. Pat proposes for No. 6392623, form in the structure of storage capacitors at the metal dielectric layer semiconductor, on the comparative electrode (counter electrode) that common electrode (common electrode) that storage capacitors one end is connect and liquid crystal capacitance one end are connect, apply the driving voltage of different potentials respectively, the gray scale (gray scale) that can improve active-matrix formula film liquid crystal display (active matrixthin-film transistor liquid crystal display abbreviates AMTFT LCD as) is because the inaccurate phenomenon that congenital technological factor causes.Yet its common voltage is the negative voltage of fixing.
Use the common voltage of AC, can reduce the amplitude (amplitude) of source electrode drive circuit (source driverintegrated circuit) output voltage, reduce power consumption.If invention with No. 6392623, above-mentioned U.S. Pat, be applied to use the film display panels (thin-film transistor liquid crystal display panel) of AC common voltage, grayscale voltage mistake in the time of can causing thin film transistor (TFT) to close causes display quality bad.
Summary of the invention
The objective of the invention is is providing a kind of shared voltage modification circuit, can use the AC common voltage to reduce the amplitude of source electrode drive circuit output voltage, reduces power consumption, and guarantees that grayscale voltage is correct, and then improve image quality.
Another object of the present invention provides a kind of common voltage modification method, can use the storage capacitors of MIS structure, to save technology mask number, reduces manufacturing cost, and guarantees that the charge number in the storage capacitors is correct, to guarantee display quality.
For reaching above-mentioned and other purpose, the present invention proposes a kind of shared voltage modification circuit, comprises common voltage generator and computing circuit.Common voltage generator output common voltage.Computing circuit provides the common electrode of output voltage to the storage capacitors of each pixel of film liquid crystal display according to predeterminated voltage and common voltage.Wherein, output voltage is all alternating voltage with common voltage.The liquid crystal capacitance of above-mentioned each pixel also is electrically connected on common voltage on comparative electrode.Output voltage is identical with the phase-locking and the amplitude of common voltage, and in addition, common voltage deducts the absolute value that output voltage equals predeterminated voltage.
Above-mentioned shared voltage modification circuit, in one embodiment, predeterminated voltage is a negative voltage, output voltage equals common voltage and adds predeterminated voltage.
Above-mentioned shared voltage modification circuit, in one embodiment, predeterminated voltage is a positive voltage, output voltage equals common voltage and deducts predeterminated voltage.
Above-mentioned shared voltage modification circuit, in one embodiment, the storage capacitors of each pixel is all the metal dielectric layer semiconductor structure.
From another viewpoint, the present invention proposes a kind of common voltage modification method in addition, and it is characterized in that provides the common electrode of output voltage to the storage capacitors of each pixel of film liquid crystal display according to predeterminated voltage and common voltage.Wherein, output voltage is all alternating voltage with common voltage.The liquid crystal capacitance of each pixel also is electrically connected on common voltage on comparative electrode.Output voltage is identical with the phase-locking and the amplitude of common voltage.At last, common voltage deducts the absolute value that output voltage equals predeterminated voltage.
As described in preferred embodiment of the present invention, the present invention be with through the common voltage of predeterminated voltage correction as output voltage, export it storage capacitors of each pixel to, simultaneously common voltage is exported to the liquid crystal capacitance of each pixel.Because predeterminated voltage is a fixed value, so output voltage is all alternating voltage with voltage jointly, and phase-locking, and amplitude is also identical.So can use the MIS structure to save technology mask number, reduce manufacturing cost.Use the AC common voltage to reduce the amplitude of source electrode drive circuit output voltage simultaneously, reduce power consumption.And can guarantee that grayscale voltage is correct, and then guarantee that the charge number in the storage capacitors is correct, to guarantee image quality.
State with other purpose, feature and advantage and can become apparent on the present invention for allowing, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the partial circuit synoptic diagram according to the film liquid crystal display of first embodiment of the invention.
Fig. 2 is the drive signal sequential chart according to the film liquid crystal display of first embodiment of the invention.
Fig. 3 is the partial circuit synoptic diagram according to the film liquid crystal display of second embodiment of the invention.
The main element description of symbols
100,300: film liquid crystal display
101,301: computing circuit
302: the common voltage generator
CLC: liquid crystal capacitance
Cs: storage capacitors
GD: gate driver circuit
OP: operational amplifier
OT: the output terminal of computing circuit
PIX: the pixel of film display panels
PL: film display panels
Q1: thin film transistor (TFT)
QS: the source electrode of thin film transistor (TFT)
R: resistor
SD: source electrode drive circuit
Vcom: common voltage
VcomH: the maximum potential of common voltage
VcomL: the potential minimum of common voltage
VGH: the output noble potential of gate driver circuit
VGL: the output electronegative potential of gate driver circuit
VOT: the output voltage of computing circuit
-Vp, Vp: predeterminated voltage
Embodiment
Below explanation please refer to Fig. 1, and Fig. 1 is the partial circuit synoptic diagram according to the film liquid crystal display 100 of first embodiment of the invention.The circuit of Fig. 1 comprises source electrode drive circuit SD, gate driver circuit (gate driver integrated circuit) GD, film display panels PL and computing circuit 101.The shared voltage modification circuit of present embodiment comprises computing circuit 101 and source electrode drive circuit SD.
Though the film display panels PL of Fig. 1 only expresses 6 pixels, in fact can comprise the pixel of any amount.For example the pixel PIX that amplifies in the middle of Fig. 1 comprises thin film transistor (TFT) Q1, storage capacitors Cs and liquid crystal capacitance CLC.Wherein the grid of thin film transistor (TFT) Q1 (gate) is electrically connected on gate driver circuit GD, and drain electrode (drain) is electrically connected on source electrode drive circuit SD.Storage capacitors Cs has an end to be electrically connected on thin film transistor (TFT) Q1 pixel electrode (pixel electrode) QS just, and the other end is electrically connected on the output terminal OT of computing circuit 101.At last, liquid crystal capacitance CLC has an end to be electrically connected on pixel electrode QS, and the other end then is electrically connected to the common electrode (common electrode) of substrate opposite side, to be electrically connected common voltage Vcom.In the middle of the present embodiment, the storage capacitors Cs of each pixel is the metal dielectric layer semiconductor structure.
With pixel PIX is example, when thin film transistor (TFT) Q1 closes, show in order to ensure correct gray scale, must keep the electric charge of storage capacitors Cs and liquid crystal capacitance CLC constant, under the constant situation of both capacitances, just to keep the pressure drop of storage capacitors Cs and liquid crystal capacitance CLC constant.In the present embodiment, common voltage Vcom is an alternating voltage.Constant for the pressure drop that makes storage capacitors Cs, the output voltage VO T of computing circuit 101 must be identical with phase-locking and the amplitude of common voltage Vcom.
In order to reach above-mentioned target, the computing circuit 101 of present embodiment can receive predeterminated voltage-Vp and common voltage Vcom, and, provide output voltage VO T storage capacitors Cs to each pixel of film liquid crystal display 100 according to predeterminated voltage-Vp and common voltage Vcom.Wherein, output voltage VO T is all alternating voltage with common voltage Vcom.The liquid crystal capacitance CLC of each pixel also is electrically connected on common voltage Vcom.Output voltage VO T is identical with phase-locking and the amplitude of common voltage Vcom, and common voltage Vcom deducts the absolute value that output voltage VO T equals predeterminated voltage-Vp.
In the present embodiment, common voltage Vcom is provided by source electrode drive circuit SD.Predeterminated voltage-Vp is a negative voltage, adds predeterminated voltage-Vp so output voltage VO T equals common voltage Vcom.Numerical value as for predeterminated voltage-Vp then is to come for No. 6392623 according to previous U.S. Pat.That is to say, predeterminated voltage-Vp equals-Vpmax-Vdmax, wherein-Vpmax exports the minimum voltage of each pixel to for source electrode drive circuit SD, and Vdmax maintains the required voltage of breadth extreme for the depletion layer (depletion layer) with the storage capacitors Cs of each pixel.
For common voltage Vcom is added predeterminated voltage-Vp, the computing circuit 101 of present embodiment is a positive adding circuit that constitutes with operational amplifier (operational amplifier) OP.As shown in Figure 1, computing circuit 101 comprises operational amplifier OP and four resistors (resistor) R.Wherein, operational amplifier OP is electrically connected on the output terminal OT of computing circuit 101 with its output terminal (output terminal).First resistor R is electrically connected between the output terminal and inverting input (inverting input terminal) of operational amplifier OP.First end of second resistor R is electrically connected on the inverting input of operational amplifier OP, the second end ground connection.The 3rd resistor R is electrically connected between the normal phase input end (non-invertinginput terminal) and common voltage Vcom of operational amplifier OP.At last, the 4th resistor R then is electrically connected between the normal phase input end and predeterminated voltage-Vp of operational amplifier OP.Very general on using with the positive adding circuit that operational amplifier constitutes, further details is not just given unnecessary details at this.
Fig. 2 is the input and the output waveform of computing circuit 101, and wherein VGH and VGL respectively are the high electronegative potential of gate driver circuit GD output, and VcomH and VcomL respectively are mxm. and the minimum of common voltage Vcom.In the present embodiment, common voltage Vcom is in the swing of the interval of 5V and 0V, and output voltage VO T to be common voltage Vcom add predeterminated voltage-Vp (is-12V) result at present embodiment, so be in-7V interval the swing with-12V.Be not difficult to find out by Fig. 2, the phase-locking of output voltage VO T and common voltage Vcom, and also amplitude is identical.
The second embodiment of the present invention below is described.Please refer to Fig. 3, Fig. 3 is the partial circuit synoptic diagram according to the film liquid crystal display 300 of second embodiment of the invention.Film liquid crystal display 300 comprises source electrode drive circuit SD, gate driver circuit GD, film display panels PL, computing circuit 301 and common voltage generator 302.The shared voltage modification circuit of present embodiment comprises computing circuit 301 and common voltage generator 302.
As shown in Figure 3, in this embodiment, common voltage Vcom is provided by common voltage generator 302, rather than from source electrode drive circuit SD.In addition, the predeterminated voltage Vp of present embodiment is a positive voltage, and output voltage VO T equals common voltage Vcom and deducts predeterminated voltage Vp.The predeterminated voltage Vp of present embodiment is identical with the predeterminated voltage numerical value of a last embodiment, but positive and negative opposite.The predeterminated voltage Vp that is to say present embodiment equals-(Vpmax)+Vdmax, wherein-Vpmax exports the minimum voltage of each pixel to for source electrode drive circuit SD, and Vdmax maintains the required voltage of breadth extreme for the depletion layer with the storage capacitors of each pixel.
As shown in Figure 3, for common voltage Vcom is deducted predeterminated voltage Vp, it is the subtraction circuit at center with operational amplifier OP that the computing circuit 301 of present embodiment is one, comprises operational amplifier OP and four resistor R.Wherein, operational amplifier OP is electrically connected on the output terminal OT of computing circuit 301 with its output terminal.First resistor R is electrically connected between the output terminal and inverting input of operational amplifier OP.Second resistor R is electrically connected between the inverting input and predeterminated voltage Vp of operational amplifier OP.The 3rd resistor R is electrically connected between the normal phase input end and common voltage Vcom of operational amplifier OP.At last, first end of the 4th resistor R is electrically connected on the normal phase input end of operational amplifier OP, the second end ground connection.Above-mentioned subtraction circuit is very general on using, and knows usually that by having in the technology of the present invention field the knowledgeable is known, and further details is not just given unnecessary details at this.
The present invention is not limited to the computing circuit of two embodiment in front.In correlative technology field of the present invention, have and know that usually the knowledgeable will be appreciated that, also have multiple other circuit can reach same effect, for example use the anti-phase adding circuit of operational amplifier equally, or other various forms of circuit, for example diode (diode) clamping circuit.Emphasis is, as long as between the output voltage and common voltage of computing circuit, have same corresponding relation to get final product.
At last, the present invention also proposes a kind of common voltage modification method of correspondence except above-mentioned shared voltage modification circuit.And abundant exposure has been arranged among the embodiment of the implementation step of this method shared voltage modification circuit in front, therefore repeat no more.
As described in above embodiment, the present invention be with through the common voltage of predeterminated voltage correction as output voltage, export it storage capacitors of each pixel to, simultaneously common voltage is exported to the liquid crystal capacitance of each pixel.Because predeterminated voltage is a fixed value, so output voltage is all alternating voltage with voltage jointly, and phase-locking, and amplitude is also identical.So can use the MIS structure to save technology mask number, reduce manufacturing cost.Use the AC common voltage to reduce the amplitude of source electrode drive circuit output voltage simultaneously, reduce power consumption.And can guarantee that grayscale voltage is correct, and then guarantee that the charge number in the storage capacitors is correct, to guarantee image quality.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any person of ordinary skill in the field; without departing from the spirit and scope of the invention; when can doing a little change and improvement, so the present invention's protection domain is as the criterion when looking the claim person of defining.
Claims (18)
1. shared voltage modification circuit is characterized in that comprising:
The common voltage generator, the output common voltage; And
Computing circuit receives predeterminated voltage and this common voltage, and according to this predeterminated voltage and this common voltage, provides the common electrode of output voltage to the storage capacitors of each pixel of film liquid crystal display; Wherein
This output voltage and this common voltage are all alternating voltage, the liquid crystal capacitance of each above-mentioned pixel also is electrically connected on this common voltage on comparative electrode, this output voltage is identical with the phase-locking and the amplitude of this common voltage, and this common voltage deducts the absolute value that this output voltage equals this predeterminated voltage.
2. shared voltage modification circuit according to claim 1 is characterized in that the source electrode drive circuit of this common voltage generator for this film liquid crystal display.
3. shared voltage modification circuit according to claim 1 is characterized in that this predeterminated voltage is a negative voltage, and this output voltage equals this common voltage and adds this predeterminated voltage.
4. shared voltage modification circuit according to claim 3, it is characterized in that this predeterminated voltage equals-Vpmax-Vdmax,-Vpmax exports the minimum voltage of each above-mentioned pixel to for the source electrode drive circuit of this film liquid crystal display, and Vdmax maintains the required voltage of breadth extreme for the depletion layer with the storage capacitors of each above-mentioned pixel.
5. shared voltage modification circuit according to claim 3 is characterized in that also comprising:
Operational amplifier is electrically connected on the output terminal of this shared voltage modification circuit with output terminal;
First resistor is electrically connected between the output terminal and inverting input of this operational amplifier;
Second resistor is electrically connected on the inverting input of this operational amplifier with first end, with the second end ground connection;
The 3rd resistor is electrically connected between the normal phase input end and this common voltage of this operational amplifier; And
The 4th resistor is electrically connected between the normal phase input end and this predeterminated voltage of this operational amplifier.
6. shared voltage modification circuit according to claim 1 is characterized in that this predeterminated voltage is a positive voltage, and this output voltage equals this common voltage and deducts this predeterminated voltage.
7. shared voltage modification circuit according to claim 6, it is characterized in that this predeterminated voltage equal-(Vpmax)+Vdmax,-Vpmax exports the minimum voltage of each above-mentioned pixel to for the source electrode drive circuit of this film liquid crystal display, and Vdmax maintains the required voltage of breadth extreme for the depletion layer with the storage capacitors of each above-mentioned pixel.
8. shared voltage modification circuit according to claim 6 is characterized in that also comprising:
Operational amplifier is electrically connected on the output terminal of this shared voltage modification circuit with output terminal;
First resistor is electrically connected between the output terminal and inverting input of this operational amplifier;
Second resistor is electrically connected between the inverting input and this predeterminated voltage of this operational amplifier;
The 3rd resistor is electrically connected between the normal phase input end and this common voltage of this operational amplifier; And
The 4th resistor is electrically connected on the normal phase input end of this operational amplifier with first end, with the second end ground connection.
9. shared voltage modification circuit according to claim 1 is characterized in that each above-mentioned pixel all comprises:
Thin film transistor (TFT) is electrically connected on the gate driver circuit of this film liquid crystal display with grid, is electrically connected on the source electrode drive circuit of this film liquid crystal display with drain electrode;
Storage capacitors is electrically connected between the source electrode and this output voltage of this thin film transistor (TFT); And
Liquid crystal capacitance is electrically connected between the source electrode and this common voltage of this thin film transistor (TFT).
10. shared voltage modification circuit according to claim 1 is characterized in that the storage capacitors of each above-mentioned pixel is all the metal dielectric layer semiconductor structure.
11. a common voltage modification method is characterized in that:
According to predeterminated voltage and common voltage, the common electrode of output voltage to the storage capacitors of each pixel of film liquid crystal display is provided, wherein this output voltage and this common voltage are all alternating voltage, the liquid crystal capacitance of each above-mentioned pixel also is electrically connected on this common voltage on comparative electrode, this output voltage is identical with the phase-locking and the amplitude of this common voltage, and this common voltage deducts the absolute value that this output voltage equals this predeterminated voltage.
12. common voltage modification method according to claim 11 is characterized in that this common voltage is that source electrode drive circuit by this film liquid crystal display is provided.
13. common voltage modification method according to claim 11 is characterized in that this common voltage is that common voltage generator by this film liquid crystal display is provided.
14. common voltage modification method according to claim 11 is characterized in that this predeterminated voltage is a negative voltage, this output voltage equals this common voltage and adds this predeterminated voltage.
15. common voltage modification method according to claim 14, it is characterized in that this predeterminated voltage equals-Vpmax-Vdmax,-Vpmax exports the minimum voltage of each above-mentioned pixel to for the source electrode drive circuit of this film liquid crystal display, and Vdmax maintains the required voltage of breadth extreme for the depletion layer with the storage capacitors of each above-mentioned pixel.
16. common voltage modification method according to claim 11 is characterized in that this predeterminated voltage is a positive voltage, this output voltage equals this common voltage and deducts this predeterminated voltage.
17. common voltage modification method according to claim 16, it is characterized in that this predeterminated voltage equal-(Vpmax)+Vdmax,-Vpmax exports the minimum voltage of each above-mentioned pixel to for the source electrode drive circuit of this film liquid crystal display, and Vdmax maintains the required voltage of breadth extreme for the depletion layer with the storage capacitors of each above-mentioned pixel.
18. common voltage modification method according to claim 11 is characterized in that the storage capacitors of each above-mentioned pixel is all the metal dielectric layer semiconductor structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101081045A CN100461248C (en) | 2005-09-29 | 2005-09-29 | Shared voltage modification circuit and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101081045A CN100461248C (en) | 2005-09-29 | 2005-09-29 | Shared voltage modification circuit and method |
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| CN1941055A true CN1941055A (en) | 2007-04-04 |
| CN100461248C CN100461248C (en) | 2009-02-11 |
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| CNB2005101081045A Expired - Fee Related CN100461248C (en) | 2005-09-29 | 2005-09-29 | Shared voltage modification circuit and method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854150A (en) * | 2008-12-31 | 2010-10-06 | 东部高科股份有限公司 | Operational amplifier |
| CN102243851A (en) * | 2011-05-17 | 2011-11-16 | 友达光电股份有限公司 | Liquid crystal display device with common voltage compensation mechanism and common voltage compensation method |
| CN102034439B (en) * | 2009-09-28 | 2013-06-05 | 北京京东方光电科技有限公司 | Liquid crystal display driving device |
| CN103869515A (en) * | 2013-12-24 | 2014-06-18 | 中国科学院微电子研究所 | Alternating current driving method of liquid crystal materials |
| CN106128396A (en) * | 2016-08-31 | 2016-11-16 | 深圳市华星光电技术有限公司 | Common electrode mu balanced circuit, display floater and common electrode method for stabilizing voltage |
| CN107221297A (en) * | 2017-05-31 | 2017-09-29 | 友达光电股份有限公司 | Display device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3992984B2 (en) * | 2002-01-04 | 2007-10-17 | シャープ株式会社 | LCD panel |
| CN100373439C (en) * | 2003-09-18 | 2008-03-05 | 统宝光电股份有限公司 | Driving method and circuit for liquid crystal display |
| JP2005234496A (en) * | 2004-02-23 | 2005-09-02 | Toshiba Matsushita Display Technology Co Ltd | Flicker compensating circuit |
| CN1648753A (en) * | 2005-03-11 | 2005-08-03 | 友达光电股份有限公司 | Display unit |
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- 2005-09-29 CN CNB2005101081045A patent/CN100461248C/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101854150A (en) * | 2008-12-31 | 2010-10-06 | 东部高科股份有限公司 | Operational amplifier |
| CN102034439B (en) * | 2009-09-28 | 2013-06-05 | 北京京东方光电科技有限公司 | Liquid crystal display driving device |
| US10373576B2 (en) | 2009-09-28 | 2019-08-06 | Boe Technology Group Co., Ltd. | Liquid crystal display driving apparatus including pixel voltage driving circuit for providing periodical pulse high-voltage signal |
| CN102243851A (en) * | 2011-05-17 | 2011-11-16 | 友达光电股份有限公司 | Liquid crystal display device with common voltage compensation mechanism and common voltage compensation method |
| CN103869515A (en) * | 2013-12-24 | 2014-06-18 | 中国科学院微电子研究所 | Alternating current driving method of liquid crystal materials |
| CN106128396A (en) * | 2016-08-31 | 2016-11-16 | 深圳市华星光电技术有限公司 | Common electrode mu balanced circuit, display floater and common electrode method for stabilizing voltage |
| CN106128396B (en) * | 2016-08-31 | 2019-03-26 | 深圳市华星光电技术有限公司 | Common electrode voltage regulator circuit, display panel and common electrode method for stabilizing voltage |
| CN107221297A (en) * | 2017-05-31 | 2017-09-29 | 友达光电股份有限公司 | Display device |
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| CN100461248C (en) | 2009-02-11 |
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