CN101281329A - LCD and subpixel - Google Patents
LCD and subpixel Download PDFInfo
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- CN101281329A CN101281329A CNA2007100920672A CN200710092067A CN101281329A CN 101281329 A CN101281329 A CN 101281329A CN A2007100920672 A CNA2007100920672 A CN A2007100920672A CN 200710092067 A CN200710092067 A CN 200710092067A CN 101281329 A CN101281329 A CN 101281329A
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Abstract
The invention relates to a subpixel of liquid crystal display, comprising a first region having a first storage capacitance and a second region having a second storage capacitance. The first storage capacitance is connected with a shared line of the liquid crystal pixel and the second storage capacitance is connected with a gate line of another subpixel adjacent to the subpixel.
Description
Invention field
The present invention relates to LCD, and relate in particular to the LCD that its sub-pixel has multizone.
Technical background
Be widely used in most the wide-angle technology of Thin Film Transistor-LCD (TFT-LCD) at present, be respectively plane conversion formula (in-plane switching, IPS) with perpendicular alignmnet formula (verticalalignment, VA), with the plane conversion formula, it need not compensate film and just has best viewing angle characteristic and color representation, and the reaction velocity between the GTG is even, but it is to lower, and the yield when making is also low.And the perpendicular alignmnet formula has higher yield, contrast is also high, but need be aided with compensate film and just wide-visual angle effect can be arranged, and on color representation, be not so good as the plane conversion formula, as the LCD of perpendicular alignmnet formula when watching with rake angle, the Asian colour of skin just has inclined to one side indigo plant or white partially phenomenon, and this is called colour cast (color wash-out).
The solution of colour cast problem, can be improved by in a sub-pixel, producing the effect that two different gamma curves (gamma curve) reach colour mixture, this kind technology then is called shadow tone (half-tone), and wherein, each sub-pixel is corresponding to the color one of in red, green or basket.And in order to produce different gamma curves in a sub-pixel, the most direct mode is divided into two zones exactly in a sub-pixel, and the pixel electrode that also is about to sub-pixel originally is divided into two, so a kind of dual area sub-pixel is born thus.And the technology of this shadow tone always has the circuit design of three sub pixels.
Seeing also Fig. 1, is the equivalent circuit diagram of first kind of halftone pixel commonly used.Wherein disclose first sub pixel 1, comprised data line DL, sweep trace GL and bridging line CL.And first sub pixel 1 also be provided with the drain electrode that thin film transistor (TFT) 10, storage capacitors 11 connects this bridging line CL and this thin film transistor (TFT) 10, data line DL then is connected to the source electrode of thin film transistor (TFT) 10, sweep trace GL then is connected to the grid of thin film transistor (TFT) 10.And, first sub pixel 1 also comprises two liquid crystal capacitances, it is respectively the first liquid crystal capacitance 12a and the second liquid crystal capacitance 12b, and the first pixel electrode 1a that the first liquid crystal capacitance 12a has is connected with the drain electrode of thin film transistor (TFT) 10, and the second liquid crystal capacitance 12b has the second pixel electrode 1b.First sub pixel 1 that Fig. 1 is disclosed, be by the effect that series capacitance 13 reaches capacitance partial pressure is set between the first pixel electrode 1a and the second pixel electrode 1b, make the first pixel electrode 1a different with the gamma curve of the second pixel electrode 1b, furthermore, the voltage of the first pixel electrode 1a is write direct by thin film transistor (TFT) 10 by data line DL, the voltage of the second pixel electrode 1b then depends on the dividing potential drop of the series capacitance 13 and the second liquid crystal capacitance 12b, in other words, the second liquid crystal capacitance 12b of the second pixel electrode 1b is the state at a suspension joint, and its current potential decides by coupling.Thisly by series capacitance 13 and separately and then produce two different gamma curves with the current potential of two liquid crystal capacitances, simple structure, the electronic component that is increased is less, the more important thing is that cabling does not increase, and is therefore also less to the influence of aperture opening ratio.Yet, the problem that series capacitance 13 is brought is in the operation of panel, it can be caught electric charge and cause the potential shift setting value of the second pixel electrode 1b and produce image residue, except having reliability issues, also can cause ripples line (mura the claims moire again) phenomenon of color, brightness irregularities.
Seeing also Fig. 2, is the equivalent circuit diagram of second kind of halftone pixel commonly used.It is characterized in that directly coming given two gamma values to produce two gamma curves by two thin film transistor (TFT)s and two gate lines or two data lines.Fig. 2 has disclosed second sub pixel 2, comprise the first sweep trace GL1, the second sweep trace GL2, and be parallel between the two bridging line CL, also has data line DL, second sub pixel 2 comprises that also the grid of the first film transistor 20a is connected to the first sweep trace GL1, and the grid of the second thin film transistor (TFT) 20b is connected to the second sweep trace GL2.In addition, the drain electrode of the first film transistor 20a is connected with bridging line CL by the first storage capacitors 21a, and the drain electrode of the second thin film transistor (TFT) 20b is connected with bridging line CL by the second storage capacitors 21b.And the drain electrode of the first film transistor 20a is connected to the first liquid crystal capacitance 22a and has the first pixel electrode 2a; The drain electrode of the second thin film transistor (TFT) 20b is connected to the second liquid crystal capacitance 22b and has the second pixel electrode 2b.Though this design can be directly and is produced two groups of gamma curves effectively, but owing to increased a lead such as sweep trace more, thereby produced the spinoff of blocking, just make aperture opening ratio reduce, and the complexity that circuit system also becomes, turntable driving has also increased by one times (if with two data lines then data-driven double), and power consumption also increases.
See also Fig. 3, be the equivalent circuit diagram of the third halftone pixel commonly used.Wherein disclosed the third sub-pixel 3, it comprises the first bridging line CL1 and the second bridging line CL2, is parallel to both sweep trace GL, and data line DL.In addition, it also comprises the first film transistor 30a, its source electrode is connected to data line DL, and its grid is connected to sweep trace GL, and the source electrode of the second thin film transistor (TFT) 30b is connected to data line DL, and its grid is connected to sweep trace GL, and the drain electrode of the second thin film transistor (TFT) 30b connects the second bridging line CL2 by the second storage capacitors 31b but the drain electrode of the first film transistor 30a connects the first bridging line CL1 by the first storage capacitors 31a.And the drain electrode of the first film transistor 30a also connects the first liquid crystal capacitance 32a, and the drain electrode of the second thin film transistor (TFT) 30b then connects the second liquid crystal capacitance 32b.Identical with Fig. 2 is, the sub-pixel of Fig. 3 also is the purpose that reaches the current potential of cutting apart the first pixel electrode 3a and the second pixel electrode 3b by two thin film transistor (TFT) 30a and 30b, yet different with the common technology of Fig. 2 is, the third sub-pixel 3 of Fig. 3 is to produce different gamma curves with two shared lines, further, the first pixel electrode 3a and the second pixel electrode 3b correspond to different bridging line CL1 and CL2 and are connected to different signal sources separately exactly.Couple square wave inverting each other as the first bridging line CL1 and the second bridging line CL2, produce different couplings so close the back, and then the first pixel electrode 3a and the current potential of the second pixel electrode 3b are separated, produce different gamma curves at thin film transistor (TFT).Though the third sub-pixel 3 does not increase the quantity of gate line or data line, still increased by a shared line, aperture opening ratio still descends.Moreover, except the current potential that will supply two shared lines, also to produce two groups of signal sources and supply with its use, this also can make, and the complexity of system increases, cost rises, and power consumption also has increase.
So, how on sub-pixel, produce a plurality of different gamma curves, and can under the situation that does not increase cabling, element as much as possible, be maintained aperture opening ratio, the complexity of minimizing system, and possess fiduciary level, even be the insoluble problem of perpendicular alignmnet formula LCD of using dual area multizone type sub-pixel always.
Summary of the invention
Because traditional employed technology of multizone sub-pixel can cause reliability issues, ripples line (mura) phenomenon or the complexity that makes aperture ratio of pixels descend and system is become because of newly-increased lead.The present invention creates the pixel design that makes new advances with incomparable clever thought, need not to increase cabling, and can cooperate the existing common voltage modulation control (Vcommodulation) of old profile plate, so need not altering system, as long as load onto panel of the present invention, whole LCD gets final product start.
To achieve the above object, the invention provides a kind of sub-pixel of LCD, be divided into first area and second area at least, and comprise substrate; The first sweep trace GL1; Parallel this first sweep trace of second sweep trace and and bridging line, be arranged on this substrate; First pixel electrode is positioned at this first area; Second pixel electrode is positioned at this second area; First storage capacitors, one end are connected in this first pixel electrode, and the other end is connected in this bridging line; And second storage capacitors, the one end is connected in this second pixel electrode 4b, and the other end is connected in this second sweep trace.
The sub-pixel of foregoing LCD, also comprise have first grid, the first film transistor of first source electrode and first drain electrode, and this first grid is connected in this first sweep trace, this first drain electrode is connected in this first pixel electrode 4a; And second thin film transistor (TFT) with second grid, second source electrode and second drain electrode, and this second grid is connected in this first sweep trace, and this second drain electrode is connected in this second pixel electrode.
To achieve the above object, the invention provides the driving method of another kind of LCD, it is applied to sub-pixel, and this sub-pixel comprises: first sweep trace, second sweep trace and bridging line; First storage capacitors, the one end is connected in first pixel electrode, and the other end is connected in this bridging line; Second storage capacitors, the one end is connected in second pixel electrode, and the other end is connected in this second sweep trace; The first film transistor a and second thin film transistor (TFT) and its grid all are connected in this first sweep trace, and its drain electrode separately is connected to this first pixel electrode and this second area electrode; Wherein, this driving method comprises: provide noble potential to this first sweep trace; Write first data-signal to this first pixel electrode and this second pixel electrode; Provide common voltage to this bridging line; And provide electronegative potential to this first sweep trace, this second thin film transistor (TFT) of this first film transistor AND gate is open circuit shape and make first pixel electrode and second pixel electrode insulated from each other.
Aforesaid method, wherein this bridging line is controlled with the common voltage modulation.
Description of drawings
Fig. 1 is the equivalent circuit diagram of first kind of halftone pixel commonly used;
Fig. 2 is the equivalent circuit diagram of second kind of halftone pixel commonly used;
Fig. 3 is the equivalent circuit diagram of the third halftone pixel commonly used;
Fig. 4 is the equivalent circuit diagram of the halftone pixel of the embodiment of the invention;
Fig. 5 is the oscillogram of the present invention with common voltage modulation control bridging line;
Fig. 6 is drive waveforms figure of the present invention; And
Fig. 7 is the equivalent circuit diagram of the halftone pixel of the another kind of embodiment of the present invention.
Embodiment
See also Fig. 4, it is the equivalent circuit diagram of the halftone pixel of first embodiment of the invention.Wherein disclosed first sub-pixel 4 and one second adjacent with it sub-pixel 4 ', and second sub-pixel 4 ' only discloses the second sweep trace GL2 that it has, and first sub-pixel 4 comprises bridging line CL, the first sweep trace GL1 and data line DL.And, in order to obtain two gamma curves to reach the effect of colour mixture, so in first sub-pixel 4, comprise two liquid crystal capacitances, be respectively the first liquid crystal capacitance 42a and the second liquid crystal capacitance 42b, wherein the first liquid crystal capacitance 42a position is first area a, and the second liquid crystal capacitance 42b position is second area b.And this two liquid crystal capacitance has the first pixel electrode 4a and the second pixel electrode 4b separately; The sub-pixel 4 of this embodiment comprises two thin film transistor (TFT) TFT (40a, 40b), lay respectively at first area a and second area b, the drain electrode of these two thin film transistor (TFT) TFT is connected with the first liquid crystal capacitance 42a and the second liquid crystal capacitance 42b separately, source electrode then all is connected with data line DL, and grid then all is connected with the first sweep trace GL1.So as first sweep trace GL1 when to be electronegative potential with the first film transistor T FT 40a and the second thin film transistor (TFT) TFT 40b close, the first pixel electrode 4a and the second pixel electrode 4b just can insulate.In addition, the drain electrode of this first film transistor 40a still is connected with the first sweep trace GL1 by the first stray capacitance 43a; The drain electrode of the second thin film transistor (TFT) 40b then is connected with the first sweep trace GL1 by the second stray capacitance 43b.Different with described dual area type sub-pixel commonly used before is, though the first liquid crystal capacitance 42a of the present invention, the second liquid crystal capacitance 42b connect the first storage capacitors 41a and the second storage capacitors 41b respectively, but, the present invention will wherein one be connected on the bridging line CL, and another is connected on the second grid line GL2 of second sub-pixel 4 ', and collocation common voltage modulation control (common voltage modulation), can make the first pixel electrode 4a different, and need not to increase any lead with the second pixel electrode 4b current potential.
See also Fig. 5, it is according to the common voltage modulation control voltage bridging line of the bridging line of first embodiment of the invention and the waveform synoptic diagram of pixel voltage.Promptly come bridging line CL is controlled in this embodiment by the common voltage demodulating voltage.Used the common voltage modulation is the regulation of line voltage that is used for reducing data line in the past, with the cost that lowers data-driven integrated circuit (IC).And in the present embodiment, then control bridging line CL with voltage modulation, therefore common voltage will have two accurate positions (comprising a high levle and a low level), every sub-pixel voltage is write fashionable, the voltage of bridging line CL can change once accurate position, so write when being positive polarity with respect to common voltage when pixel voltage, then bridging line voltage (Vcom) is low level, and write when being negative polarity with respect to common voltage when pixel voltage, then common voltage is a high levle.
See also Fig. 6, be the drive waveforms figure of first embodiment of the invention.Because the first storage capacitors 41a and the first liquid crystal capacitance 42a of first area a are connected in bridging line CL, and have only the second liquid crystal capacitance 42b to be connected in bridging line CL among the second area b, its second storage capacitors 41b is connected gate lines G L2, therefore when signal be in noble potential and respectively with first and second transistor 40a and 40b unlatching after, the suffered change that comes from common voltage signal Coupling Potential of the first pixel electrode 4a will be greater than the second pixel electrode 4b, therefore, the first pixel electrode 4a and the second pixel electrode 4b current potential will be different, so that the gamma curve of the gamma curve of first area and second area is different, naturally and understandably produce the effect of colour mixture.
See also Fig. 7, it is the equivalent circuit diagram of the halftone pixel of the another kind of embodiment of the present invention, and its most structure is identical with the embodiment of Fig. 4, and components identical is represented with similar numbering.Disclosed first sub-pixel 5 and the second adjacent with it sub-pixel 5 ' among this embodiment, and second sub-pixel 5 ' only discloses the second sweep trace GL2 that it has, and first sub-pixel 5 comprises bridging line CL, the first sweep trace GL1 and data line DL.And, in order to obtain two gamma curves to reach the effect of colour mixture, so in sub-pixel 5, comprise two liquid crystal capacitances, be respectively the first liquid crystal capacitance 52a and the second liquid crystal capacitance 52b, wherein the first liquid crystal capacitance 52a position is first area a, and the second liquid crystal capacitance 52b position is second area b.And these two liquid crystal capacitances have the first pixel electrode 5a and the second pixel electrode 5b separately, two the thin film transistor (TFT) TFT (50a, 50b) that comprise in the present embodiment are arranged at first area and second area respectively, and the source electrode of these two thin film transistor (TFT) TFT all is connected with data line DL, grid all is connected drain electrode and then is connected with the first liquid crystal capacitance 51a, the second liquid crystal capacitance 51b separately with the first sweep trace GL1.Therefore, as first sweep trace GL1 when to be electronegative potential with the first film transistor T FT 50a and the second thin film transistor (TFT) TFT 50b close, the first pixel electrode 5a and the second pixel electrode 5b just can insulate.In addition, this first film transistor 50a connects the first sweep trace GL1 by the first stray capacitance 53a; The second thin film transistor (TFT) 51b connects the first sweep trace GL1 by the second stray capacitance 53b.Similarly, different with described sub-pixel commonly used before is, though the first liquid crystal capacitance 52a of present embodiment, the second liquid crystal capacitance 52b connect the first storage capacitors 51a and the second storage capacitors 51b respectively, but, present embodiment will wherein one be connected on the bridging line CL, and another is connected on the second sweep trace GL2 of second sub-pixel 5 ', so can make the first pixel electrode 5a different with the second pixel electrode 5b current potential, and need not to increase any lead.In addition, main different of present embodiment and first embodiment be in, the place of Fig. 5 second pixel electrode 5b, also setting up the 3rd storage capacitors 51c is connected with the drain electrode of the second thin film transistor (TFT) 50b, and the other end of the 3rd storage capacitors 51c is connected with bridging line CL, so can add the effect of strong stability pixel voltage and make design have more elasticity, and make the last various Consideration of design be able to optimization.
In sum, for perpendicular alignmnet formula Thin Film Transistor-LCD, be divided into the sub-pixel that two or more have different gamma curve output areas by an inside, the effect of the colour mixture that is produced can alleviate or eliminate the phenomenon of colour cast.Yet if for common technology shown in Figure 1, second area 1b can have fiduciary level deficiency, image residue, water ripple phenomenon because of the potential shift of series capacitance 13; For the common technology of Fig. 2, though directly effective by two gate lines or given two the different gamma curves of data line, cause aperture opening ratio reduction, system too complexity, power consumption increase because having increased cabling; And for the common technology of Fig. 3, by two shared lines and have anti-phase square wave, make the current potential of liquid crystal capacitance in two zones different and then produce different gamma curves thus, make complex system, aperture opening ratio reduces, power consumption increases problem because increase cabling but also still exist.Review the present invention, though also be a kind of liquid crystal sub-pixel with multizone, but to have the mode of clever thought, the storage capacitors that one of them is contained is connected on the sweep trace (gate line) under the nearby subpixels, and can cooperate the bridging line voltage modulation further, by such connected mode, make that the current potential of the area electrodes that the present invention is different is different and then produce different gamma curves, this shows, not only can solve the colour cast problem of perpendicular alignmnet formula Thin Film Transistor-LCD when rake angle is viewed and admired by the present invention, simultaneously also because of need not there being the design of too many cabling to improve aperture opening ratio, and also allow the design of pixel more flexible with application.Therefore, comprehensive, the present invention utilizes the original common voltage type of drive and the special sub-pixel structure of arranging in pairs or groups to produce shadow tone, so it is identical with no shadow tone in system, and, for the common technology of Fig. 2, Fig. 3, the complexity of its circuit and system also obviously reduces, therefore cost also can decrease, as seen generally speaking the present invention has reduced the complexity of cost and circuit, and reduced the consumption of the energy, very distinguished for the contribution of perpendicular alignmnet formula Thin Film Transistor-LCD technology.
Those skilled in the art can not break away from protection scope of the present invention to various modifications of the present invention.
Claims (10)
1. the sub-pixel of a LCD is divided into first area and second area at least, and comprises:
Substrate;
First sweep trace;
Second sweep trace parallel with first sweep trace and and bridging line, be arranged on this substrate;
Be positioned at first pixel electrode of this first area;
Be positioned at second pixel electrode of this second area;
First storage capacitors, one end are connected in this first pixel electrode, and the other end is connected in this bridging line; And
Second storage capacitors, one end are connected in this second pixel electrode, and the other end is connected in this second sweep trace.
2. the sub-pixel of LCD as claimed in claim 1, also comprise have first grid, the first film transistor of first source electrode and first drain electrode, and this first grid is connected in this first sweep trace, this first drain electrode is connected in this first pixel electrode; And second thin film transistor (TFT) with second grid, second source electrode and second drain electrode, and this second grid is connected in this first sweep trace, and this second drain electrode is connected in this second pixel electrode.
3. the sub-pixel of LCD as claimed in claim 1, wherein this bridging line is controlled with the common voltage modulation.
4. the sub-pixel of LCD as claimed in claim 1 wherein also comprises the 3rd storage capacitors in this second area.
5. the sub-pixel of LCD as claimed in claim 4, wherein an end of the 3rd storage capacitors is connected to this second pixel electrode.
6. the sub-pixel of LCD as claimed in claim 5, wherein the other end of the 3rd storage capacitors is connected to this bridging line.
7. the driving method of a LCD is applied to sub-pixel, and this sub-pixel comprises: first sweep trace, second sweep trace and bridging line; First storage capacitors, the one end is connected in first pixel electrode, and the other end is connected in this bridging line; Second storage capacitors, the one end is connected in second pixel electrode, and the other end is connected in this second sweep trace; The first film transistor and second thin film transistor (TFT) and its grid all are connected in this first sweep trace, and its drain electrode separately is connected to this first pixel electrode and this second area electrode;
Wherein, this driving method comprises:
Provide noble potential to this first sweep trace;
Write first data-signal to this first pixel electrode and this second pixel electrode;
Provide common voltage to this bridging line; And
Provide electronegative potential to this first sweep trace, this second thin film transistor (TFT) of this first film transistor AND gate is open circuit shape and make first pixel electrode and second pixel electrode insulated from each other.
8. driving method as claimed in claim 7, wherein this bridging line is controlled with the common voltage modulation.
9. driving method as claimed in claim 7, wherein this sub-pixel also comprises the 3rd storage capacitors, an end of the 3rd storage capacitors connects this second pixel electrode.
10. driving method as claimed in claim 7, wherein this sub-pixel also comprises the 3rd storage capacitors, an end of the 3rd storage capacitors connects this bridging line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100920672A CN101281329A (en) | 2007-04-04 | 2007-04-04 | LCD and subpixel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100920672A CN101281329A (en) | 2007-04-04 | 2007-04-04 | LCD and subpixel |
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| Publication Number | Publication Date |
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| CN101281329A true CN101281329A (en) | 2008-10-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100920672A Pending CN101281329A (en) | 2007-04-04 | 2007-04-04 | LCD and subpixel |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109724A (en) * | 2010-02-23 | 2011-06-29 | 友达光电股份有限公司 | Liquid crystal display panel and common charging method thereof |
| CN102356352A (en) * | 2009-03-24 | 2012-02-15 | 夏普株式会社 | Tft substrate and liquid crystal display apparatus using same |
| CN108922467A (en) * | 2018-06-26 | 2018-11-30 | 惠科股份有限公司 | Pixel circuit and display panel |
| WO2020015174A1 (en) * | 2018-07-17 | 2020-01-23 | 深圳市华星光电技术有限公司 | Pixel circuit and liquid crystal display panel |
-
2007
- 2007-04-04 CN CNA2007100920672A patent/CN101281329A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102356352A (en) * | 2009-03-24 | 2012-02-15 | 夏普株式会社 | Tft substrate and liquid crystal display apparatus using same |
| CN102109724A (en) * | 2010-02-23 | 2011-06-29 | 友达光电股份有限公司 | Liquid crystal display panel and common charging method thereof |
| CN102109724B (en) * | 2010-02-23 | 2013-12-25 | 友达光电股份有限公司 | Liquid crystal display panel and common charging method thereof |
| CN108922467A (en) * | 2018-06-26 | 2018-11-30 | 惠科股份有限公司 | Pixel circuit and display panel |
| CN108922467B (en) * | 2018-06-26 | 2019-12-31 | 惠科股份有限公司 | Pixel circuit and display panel |
| WO2020015174A1 (en) * | 2018-07-17 | 2020-01-23 | 深圳市华星光电技术有限公司 | Pixel circuit and liquid crystal display panel |
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Open date: 20081008 |