CN101256327A - Lcd - Google Patents
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- CN101256327A CN101256327A CNA2008100346574A CN200810034657A CN101256327A CN 101256327 A CN101256327 A CN 101256327A CN A2008100346574 A CNA2008100346574 A CN A2008100346574A CN 200810034657 A CN200810034657 A CN 200810034657A CN 101256327 A CN101256327 A CN 101256327A
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- data line
- pixel
- compensation block
- pixel electrode
- metal level
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Abstract
The invention discloses a liquid crystal display, each pixel of an array substrate comprising a storage capacitance. A data line metal layer compensation block is inserted between a pixel electrode of the storage capacitance and a common electrode and connected with the pixel electrode by a contact hole and fully covered by the pixel electrode. The area of the data line metal layer compensation block is smaller along with the distance to the scanning line of the array substrate is farther. The liquid crystal display effectively increases the storage capacitance by reducing the distance between the two metal electrodes without increasing the overlap area. Because the data line metal layer compensation block is fully covered by the pixel electrode layer, there is no problem of contraposition accuracy between the two layers, namely the difference of delta Vp of two sides of the panel is finely compensated to realize the low flash of the display panel.
Description
Technical field
The present invention relates to a kind of semiconductor element, relate in particular to Thin Film Transistor-LCD.
Background technology
(liquid crystal display is a kind of flat-panel screens that is widely used most at present LCD) to LCD, has low-power consumption, external form is thin, in light weight and feature such as low driving voltage.Liquid crystal display device module mainly is made of display panels and backlight module.Wherein, display panels normally is made of thin-film transistor array base-plate (TFT substrate), color filter film substrate (CF substrate) and the liquid crystal layer that is arranged between the two.And backlight module is in order to provide above-mentioned display panels required area source, so that LCD MODULE reaches the effect of demonstration.The TFT substrate can be divided into viewing area (display Area) and peripheral circuit (peripheral circuit area), wherein the viewing area comprises a plurality of sub-pixel unit of arranging with array structure, and each sub-pixel unit comprises one or more thin film transistor (TFT) and the pixel electrode that is attached thereto.In addition, be provided with multi-strip scanning line and data line in peripheral circuit and viewing area, wherein the thin film transistor (TFT) of each pixel cell is controlled by corresponding scanning line and data line.
Fig. 1 is the structural representation of general display panels, and Fig. 2 is the structural drawing of a pixel and the concrete schematic equivalent circuit of this pixel.As shown in Figure 1, one TFT-LCD panel comprises one scan line drive circuit district 100, a data line drive circuit district 200 and a pixel array region (effectively viewing area), wherein comprise a plurality of pixels in the pixel array region, and pixel A shown in Figure 1, pixel B, pixel C are represented to be positioned on same the sweep trace pixel from array base palte sweep trace input end different distance zone.As shown in Figure 2, a pixel comprises a liquid crystal cells, and an end is connected to a thin film transistor (TFT) TFT, and the other end and CF side common electrode form liquid crystal capacitance.Wherein the grid of thin film transistor (TFT) connects the one scan line, and its drain electrode connects a data line, and its source electrode then links to each other with the pixel electrode of liquid crystal cells.In addition, a pixel also comprises a memory capacitance, and this memory capacitance one end connects liquid crystal cells, and an end connects the common electrode distribution; The function of storage capacitors is to reduce the influence of transistorized electric leakage effect for the pixel sustaining voltage, that is assists the liquid crystal cells stored charge, and among the figure, 11 is the overlap capacitance (Cgs) of sweep trace and source electrode, 12 liquid crystal capacitances (Clc) that provide for pixel electrode.
As everyone knows, along with the voltage difference that puts on the liquid crystal cells, light also can change the penetration of liquid crystal cell.Therefore as long as control liquid crystal cell voltage, just can show the image of different GTGs according to picture to display.And the voltage that is added on the liquid crystal cells is the common electrode of CF side and the voltage difference between the pixel.After the TFT charging was finished, pixel promptly began to keep the voltage of electric charge to be maintained fixed.But this moment, pixel electrode was owing to be free of attachment to any additional electrodes, therefore be in floating state, if variation in voltage is arranged, then this variation in voltage can be coupled to pixel electrode by the coupling capacitance of parasitism to pixel electrode, and the liquid crystal cell both end voltage is changed on every side at this moment.Because grid directly overlaps with liquid crystal pixel electrodes, its coupling capacitance maximum, so having the greatest impact of bringing of the voltage jump of grid.The variation of the pixel voltage that the voltage difference between grid is opened and turn-offed is brought is commonly referred to as feedthrough (Feed through) voltage, according to the principle that electric charge is redistributed, the voltage difference of pixel before and after grid cut-offs can be expressed as: Δ Vp=Δ Vg*Cgs/ (Cgs+Cst+Clc)
In the following formula, Cgs represents that grid and pixel electrode overlap and the coupling capacitance of generation, Cst represents that as the memory capacitance of assisting the maintenance electric charge to use, the liquid crystal capacitance between Clc remarked pixel electrode and the CF side common electrode, Δ Vg represent that grid cut-offs the voltage jump of front and back sweep trace.Particularly, as shown in Figure 3, transfer the moment of closing at each row grid sweep trace to by opening, the pixel electrode that is full of electricity all has the voltage jump Δ Vp of a moment.In order to eliminate this leaping voltage to showing the influence of GTG, the general method of handling is that the voltage of adjusting common electrode compensates this Δ Vp, as shown in Figure 3, among the figure, 14 is the voltage of scan line drive circuit, 15 is the Feed Through voltage that via Cgd show electrode voltage is caused by the sweep trace change in voltage, 16 is original common electric voltage, 17 is revised common electric voltage, 18 is the correction of common electric voltage, just equal Feed Through voltage, 19 is show electrode voltage, and 20 is Source Driver voltage, 21 is Frame N (positive polarity), and 22 is Frame N+1 (negative polarity).Yet, be present in the signal lag effect that resistance on the sweep trace and electric capacity causes and cause the charging voltage at panel two ends and feedthrough (Feed through) voltage to have comparatively evident difference along with the increasing of panel size and the rising of resolution.Panel with 1024*768 resolution is an example, one have 1024*3=3076 sub-pixel in the horizontal direction, because the signal phase that the RC of sweep trace postpones to cause is delayed, cause the corners phenomenon all occurring at rising edge and negative edge away from the panel right-hand member signal of signal input side, the charge rate of panel input end (leftmost side) and rightmost side pixel can slightly be had any different, as shown in Figure 4, among the figure, 23 is sweep trace input end gate voltage signal, and 24 is away from input end gate voltage signal (rising edge and negative edge corners); Simultaneously, because the corners phenomenon of panel right-hand member signal, the Feedthrough voltage of panel right-hand member pixel is less than panel left side (because corners effect, grid voltage is still charging to pixel constantly by reaching in the disconnected process, therefore the charge distributing between pixel electrode and the peripheral coupling capacitance is just different with the panel left side), three pixels of A, B, C with regard to Fig. 1, away from the input end of sweep trace, Feedthrough voltage is just more little, that is: Δ Vpa＞Δ Vpb＞Δ Vpc.Therefore, the difference of the Feed through voltage that causes of all pixels is difficult to compensate with the adjustment of common electrode voltage.On display effect, will take place such as flicker or crosstalk etc. bad.
One of prior art promptly is the invention of doing in order to address the above problem.As shown in Figure 5, top view for existing LCD array, one pel array comprises sweep trace and is connected to driving circuit, the data line of sweep trace and is connected to the driving circuit of data line, and pixel A, pixel B and pixel C, and its position corresponds respectively to pixel A, B and the C among Fig. 1.Wherein comprise thin film transistor (TFT) and corresponding with it liquid crystal display in each independent pixel respectively.And the drain electrode of thin film transistor (TFT) links to each other with data line respectively, and its source electrode then is connected with the pixel electrode of liquid crystal cells respectively, and its grid then links to each other with sweep trace respectively.Wherein the electric capacity 11 of sweep trace and source electrode lap is Cgs, and this regional overlapping area is designated as Sgs.In equation Δ Vp=Δ Vg*Cgs/ (Cgs+Cst+Clc), because Cgs is generally much smaller than Cst and Clc, so equation
For offsetting Δ Vp at the panel input end and away from the difference of input end both sides, make grid width be the trend that increases progressively then at the panel two ends, promptly Sgs is along with more and more increasing away from input end, makes Cgsa＜Cgsb＜Cgsc.Compensate because the difference of the Δ Vp that the gate signal corners is caused makes compensation can accomplish afterwards as far as possible with this
Yet, because the overlapping area of Cgs electric capacity is less,, will cause the bigger difference of Cgs, thereby cause the compensation mechanism in the anticipation to lose efficacy if registration accuracy is relatively poor between therefore two-layer up and down.
Two of prior art also is the invention of doing in order to address the above problem.As shown in Figure 6,, memory capacitance Cst is successively decreased successively, thereby the Δ Vp difference that offset gate signal corners causes make compensation can accomplish afterwards as far as possible at the scanning-line signal input end of panel with away from input end one side
Yet same reason, this compensation mechanism also are to adopt the overlapping area that changes between the memory capacitance two-plate, therefore the registration accuracy between the flaggy of the two poles of the earth are had higher requirement, if registration accuracy is relatively poor, will cause the compensation mechanism in the anticipation to lose efficacy.
Summary of the invention
Technical matters to be solved by this invention is that a kind of LCD will be provided, in its storage capacitors, insert the data line metal level, can filter out the influence that the registration accuracy between the flaggy of the two poles of the earth is brought, realize the compensation of Δ Vp in the panel, realize the manufacturing of low flicker display panel.
The present invention solves the problems of the technologies described above the technical scheme that adopts to provide a kind of LCD, its array base palte pel array comprises sweep trace and is connected to the driving circuit of sweep trace, data line and the driving circuit that is connected to data line, and the some pixels that limit by sweep trace and data line, comprise thin film transistor (TFT) and corresponding with it liquid crystal display in each pixel respectively, and the drain electrode of thin film transistor (TFT) links to each other with data line, its source electrode then is connected with the pixel electrode of liquid crystal cells, its grid then links to each other with sweep trace, each pixel also comprises a memory capacitance, this memory capacitance is partly formed by the pixel electrode of liquid crystal cells and the overlapping of common electrode distribution, between the pixel electrode of this memory capacitance and common electrode, insert and be provided with data line metal level compensation block, this data line metal level compensation block links to each other with pixel electrode by contact hole, and is covered by pixel electrode fully.
Described data line metal level compensation block is along with the sweep trace input end of distance arrays substrate its area far away more is just more little.Its concrete mode can be as follows,
One: the pixel on the same horizontal direction of pel array is divided between several region, the area of this data line metal level compensation block of the pixel in the wherein same interval is equal substantially, and the area difference of this data line metal level compensation block of interior pixel is a predetermined value between any two adjacent regions.
Its two: in the described array base palte pel array, on the same horizontal direction in per two neighbors the area difference of described data line metal level compensation block be a predetermined value.
Characteristics of the present invention are, between the pixel electrode of described memory capacitance and common electrode, insert the compensation block of data line metal level, this data metal layer compensation block is nearer apart from pixel electrode layer with respect to the common electrode metal level, this data metal layer compensation block links to each other with pixel electrode by contact hole simultaneously, and is covered by pixel electrode fully; Like this, under the situation that does not increase the overlapping area,, increased memory capacitance effectively by reducing the distance between two metal polar plates.
In addition, the area that inserts this data metal layer compensation block that is arranged at the memory capacitance place is variable, and along with the sweep trace input end of distance panel is far away more, the area of this data line metal level compensation block is more little, and the memory capacitance Cst that promptly should locate picture is more little; And cover owing to this data metal layer compensation block is entirely pixel electrode layer, so do not exist two-layer between the problem of aligning accuracy, difference that can good compensation panel both sides Δ Vp makes picture element A shown in Figure 1, picture element B, the trizonal Feed through of picture element C voltage equal substantially:
Thereby the compensation of Δ Vp in the realization panel realizes the low flicker of display panel.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is the LCD (Liquid Crystal Display) array substrate structural scheme of mechanism;
Fig. 2 a is the liquid crystal pixel structural representation;
Fig. 2 b is a liquid crystal pixel structural equivalents circuit diagram;
Fig. 3 is feedthrough (Feed through) voltage and common electric voltage compensation synoptic diagram;
Fig. 4 is sweep trace input end and far-end gate voltage signal shape comparison diagram;
Fig. 5 is technology one synoptic diagram of existing compensation feedthrough (Feed through) voltage difference, and wherein 5A, 5B, 5C are respectively the dot structure synoptic diagram corresponding to A, B, C position among Fig. 1;
Fig. 6 is technology two synoptic diagram of existing feedthrough (Feed through) voltage difference, and wherein 6A, 6B, 6C are respectively the dot structure synoptic diagram corresponding to A, B, C position among Fig. 1;
Fig. 7 is a this patent LCD device pixel structure synoptic diagram, and wherein 7A, 7B, 7C are respectively the dot structure synoptic diagram corresponding to A, B, C position among Fig. 1.
Among the figure:
1. sweep trace 2. data lines 3. common electrodes 31. memory capacitance
100. be connected to the driving circuit of sweep trace
200. be connected to the driving circuit of data line
4. 5. pixel electrode of thin film transistor (TFT) (TFT)
6. data line metal level compensation block
Embodiment
As shown in Figure 7, a kind of LCD is made of thin-film transistor array base-plate (TFT substrate), color filter film substrate (CF substrate) and the liquid crystal layer that is arranged between the two, and resolution is 1024*768.The pel array of its array base palte comprises sweep trace 1 and is connected to the driving circuit 100 of sweep trace, data line 2 and the driving circuit 200 that is connected to data line, and the some pixels that limit by sweep trace 1 and data line 2, have 3072 pixels on the same horizontal direction in its pel array, comprise thin film transistor (TFT) 4 and corresponding with it liquid crystal display in each pixel respectively, and the drain electrode of thin film transistor (TFT) 4 links to each other with data line 2, its source electrode then is connected with the pixel electrode 5 of liquid crystal cells, its grid then links to each other with sweep trace 1, each pixel also comprises a memory capacitance 31, this memory capacitance 31 is partly formed by the pixel electrode 5 of liquid crystal cells and the overlapping of common electrode distribution 3, pixel electrode 5 and the insertion between the common electrode 3 in this memory capacitance 31 are provided with data line metal level compensation block 6, this data line metal level compensation block 6 links to each other with pixel electrode 5 by contact hole, and is covered by pixel electrode 5 fully.
3072 pixels are divided into (A, B, C between several region ... Deng interval), the area of this data line metal level compensation block 6 of the pixel in the wherein same interval is equal substantially, and the area difference of this data line metal level compensation block 6 of interior pixel is a predetermined value between any two adjacent regions, and along with sweep trace 1 input end its area far away more of distance arrays substrate is just more little.
This data line metal level compensation block 6 links to each other with pixel electrode 5 by contact hole, and is covered by pixel electrode 5 fully.
In addition, the shape of data line metal level compensation block 6 is not defined as rectangle, as long as satisfy technological requirement, can be clipped between common electrode metal level and the pixel electrode metal level, and be connected with the pixel electrode metal level and covered fully by contact hole and get final product by the pixel electrode metal level.
Other structures are substantially the same manner as Example 1, just in the pel array of array base palte, the area difference of described data line metal level compensation block 6 is a predetermined value in per two neighbors of 3072 pixels of same horizontal direction, and along with sweep trace 1 input end its area far away more of distance arrays substrate is just more little.Can make feedthrough (Feed through) voltage of each picture element basic identical thus more accurately.
Claims (4)
1. LCD, its array base palte pel array comprises sweep trace and is connected to the driving circuit of sweep trace, data line and the driving circuit that is connected to data line, and the some pixels that limit by sweep trace and data line, comprise thin film transistor (TFT) and corresponding with it liquid crystal display in each pixel respectively, and the drain electrode of thin film transistor (TFT) links to each other with data line, its source electrode then is connected with the pixel electrode of liquid crystal cells, its grid then links to each other with sweep trace, each pixel also comprises a memory capacitance, this memory capacitance is partly formed by the pixel electrode of liquid crystal cells and the overlapping of common electrode distribution, it is characterized in that: between the pixel electrode of this memory capacitance and common electrode, insert and be provided with data line metal level compensation block, this data line metal level compensation block links to each other with pixel electrode by contact hole, and is covered by pixel electrode fully.
2. LCD according to claim 1 is characterized in that: described data line metal level compensation block is along with the sweep trace input end of distance arrays substrate its area far away more is just more little.
3. LCD according to claim 2, it is characterized in that: the pixel on the same horizontal direction of pel array is divided between several region, the area of this data line metal level compensation block of the pixel in the wherein same interval is equal substantially, and the area difference of this data line metal level compensation block of interior pixel is a predetermined value between any two adjacent regions.
4. LCD according to claim 2 is characterized in that: in the described array base palte pel array, the area difference of the interior described data line metal level compensation block of per two neighbors is a predetermined value on the same horizontal direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100346574A CN101256327A (en) | 2008-03-14 | 2008-03-14 | Lcd |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100346574A CN101256327A (en) | 2008-03-14 | 2008-03-14 | Lcd |
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| CN101256327A true CN101256327A (en) | 2008-09-03 |
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| CNA2008100346574A Pending CN101256327A (en) | 2008-03-14 | 2008-03-14 | Lcd |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102243406A (en) * | 2011-07-06 | 2011-11-16 | 南京中电熊猫液晶显示科技有限公司 | Self-compensated storage capacitor pixel structure for improving variation of tone curve |
| CN101989002B (en) * | 2009-07-30 | 2012-06-27 | 华映视讯（吴江）有限公司 | Liquid crystal display panel |
| CN103941439A (en) * | 2013-06-28 | 2014-07-23 | 上海中航光电子有限公司 | Feed-through voltage compensating driving circuit and array substrate |
| CN104391411A (en) * | 2014-12-16 | 2015-03-04 | 深圳市华星光电技术有限公司 | LCD panel |
| CN104464680A (en) * | 2014-12-31 | 2015-03-25 | 深圳市华星光电技术有限公司 | Array substrate and display device |
| CN106297707A (en) * | 2016-09-06 | 2017-01-04 | 武汉华星光电技术有限公司 | A kind of display panels and drive circuit thereof |
| CN106502017A (en) * | 2016-12-30 | 2017-03-15 | 武汉华星光电技术有限公司 | Display floater and display |
| CN106647085A (en) * | 2017-02-27 | 2017-05-10 | 武汉华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| WO2018196072A1 (en) * | 2017-04-26 | 2018-11-01 | 武汉华星光电技术有限公司 | Array substrate, photomask, and display device |
| CN109449196A (en) * | 2018-12-29 | 2019-03-08 | 厦门天马微电子有限公司 | Display panel and display device |
| WO2020113893A1 (en) * | 2018-12-06 | 2020-06-11 | 武汉华星光电半导体显示技术有限公司 | Oled display panel |
| CN112289268A (en) * | 2020-11-02 | 2021-01-29 | 武汉华星光电技术有限公司 | Driving method and device of display panel |
| CN112394557A (en) * | 2020-12-07 | 2021-02-23 | 厦门天马微电子有限公司 | Display panel and display device |
| CN113140576A (en) * | 2021-04-19 | 2021-07-20 | 厦门天马微电子有限公司 | Array substrate and display panel |
| CN114974157A (en) * | 2022-04-07 | 2022-08-30 | Tcl华星光电技术有限公司 | Display panel and display device |
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2008
- 2008-03-14 CN CNA2008100346574A patent/CN101256327A/en active Pending
Cited By (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101989002B (en) * | 2009-07-30 | 2012-06-27 | 华映视讯（吴江）有限公司 | Liquid crystal display panel |
| CN102243406A (en) * | 2011-07-06 | 2011-11-16 | 南京中电熊猫液晶显示科技有限公司 | Self-compensated storage capacitor pixel structure for improving variation of tone curve |
| US9858879B2 (en) | 2013-06-28 | 2018-01-02 | Shanghai Avic Optoelectronics Co., Ltd. | Driving circuit with a feed through voltage compensation and array substrate |
| CN103941439A (en) * | 2013-06-28 | 2014-07-23 | 上海中航光电子有限公司 | Feed-through voltage compensating driving circuit and array substrate |
| CN103941439B (en) * | 2013-06-28 | 2016-09-28 | 上海中航光电子有限公司 | A kind of compensating feed through voltage drive circuit and array base palte |
| CN104391411A (en) * | 2014-12-16 | 2015-03-04 | 深圳市华星光电技术有限公司 | LCD panel |
| CN104391411B (en) * | 2014-12-16 | 2017-06-06 | 深圳市华星光电技术有限公司 | A kind of liquid crystal display panel |
| CN104464680A (en) * | 2014-12-31 | 2015-03-25 | 深圳市华星光电技术有限公司 | Array substrate and display device |
| CN106297707A (en) * | 2016-09-06 | 2017-01-04 | 武汉华星光电技术有限公司 | A kind of display panels and drive circuit thereof |
| CN106502017A (en) * | 2016-12-30 | 2017-03-15 | 武汉华星光电技术有限公司 | Display floater and display |
| CN106647085B (en) * | 2017-02-27 | 2020-03-31 | 武汉华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| CN106647085A (en) * | 2017-02-27 | 2017-05-10 | 武汉华星光电技术有限公司 | Liquid crystal display panel and liquid crystal display device |
| WO2018196072A1 (en) * | 2017-04-26 | 2018-11-01 | 武汉华星光电技术有限公司 | Array substrate, photomask, and display device |
| WO2020113893A1 (en) * | 2018-12-06 | 2020-06-11 | 武汉华星光电半导体显示技术有限公司 | Oled display panel |
| CN109449196A (en) * | 2018-12-29 | 2019-03-08 | 厦门天马微电子有限公司 | Display panel and display device |
| CN109449196B (en) * | 2018-12-29 | 2020-08-18 | 厦门天马微电子有限公司 | Display panel and display device |
| CN112289268A (en) * | 2020-11-02 | 2021-01-29 | 武汉华星光电技术有限公司 | Driving method and device of display panel |
| CN112394557A (en) * | 2020-12-07 | 2021-02-23 | 厦门天马微电子有限公司 | Display panel and display device |
| CN112394557B (en) * | 2020-12-07 | 2022-07-01 | 厦门天马微电子有限公司 | Display panel and display device |
| CN113140576A (en) * | 2021-04-19 | 2021-07-20 | 厦门天马微电子有限公司 | Array substrate and display panel |
| CN113140576B (en) * | 2021-04-19 | 2022-11-01 | 厦门天马微电子有限公司 | Array substrate and display panel |
| CN114974157A (en) * | 2022-04-07 | 2022-08-30 | Tcl华星光电技术有限公司 | Display panel and display device |
| CN114974157B (en) * | 2022-04-07 | 2024-03-08 | Tcl华星光电技术有限公司 | Display panel and display device |
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