CN201293901Y

CN201293901Y - Liquid crystal display panel

Info

Publication number: CN201293901Y
Application number: CNU2008201558208U
Authority: CN
Inventors: 高孝裕; 李喜峰; 田广彦
Original assignee: SVA Group Co Ltd
Current assignee: SVA Group Co Ltd
Priority date: 2008-11-24
Filing date: 2008-11-24
Publication date: 2009-08-19
Anticipated expiration: 2018-11-24

Abstract

The utility model relates to a liquid crystal display panel, which comprises a plurality of pixels, a plurality of grid scanning lines and a plurality of data lines, wherein the pixels are arranged in matrix, the grid scanning lines provide scanning signals for each row of pixels, the data lines provide data signals for each line of pixels, the grid scanning lines are connected with a grid driver, the data lines are connected with a data driver, and the grid driver and the data driver are driven by a time schedule controller. Besides, the liquid crystal display panel further comprises a line of virtual pixels and a voltage comparator, the voltage comparator comprises a first input end, a second input end and a feedback output end, wherein the first input end and the second input end are connected with the virtual pixels, and the feedback output end is connected with the data driver. The liquid crystal display panel can avoid flash or image sticking caused by feed-through voltage through adjusting the data line voltage outputted by each pixel.

Description

Display panels

Technical field

The utility model relates to a kind of display panels, particularly relates to a kind of display panels that can regulate the image quality flicker automatically.

Background technology

(thin film transistor liquid crystal display is a kind of flat-panel screens that is widely used most at present TFT-LCD) to Thin Film Transistor-LCD, and it has advantages such as low-power, thin type light weight and low voltage drive.Fig. 1 is the structural representation of existing display panels.Each pixel comprises liquid crystal capacitance Clc and storage capacitors Cst, and wherein liquid crystal capacitance Clc makes liquid crystal under the effect of pixel voltage, rotate, thus the transmitance of control light valve; Storage capacitors Cst makes the variation that reduces pixel voltage in a frame time.The gate terminal of each thin film transistor (TFT) (TFT) links to each other with gate line, and source terminal links to each other with data line, and drain electrode end links to each other with pixel electrode.Gate drivers is connected with all Gate electrode, and data driver links to each other with all Data.Gate drivers and data driver come opening and closing of control gate line by Timing controler, and the output of signal.In order to regulate public electrode Com voltage, image quality is under the minimum state of flicker, being in 128 GTGs with picture usually is that benchmark is debugged.As shown in Figure 2, when picture shows 128 GTGs, regulate Com voltage, make the voltage difference of the voltage and the Com of pixel voltage positive polarity, be V128+, equate with the absolute value of the voltage difference of Com with the voltage of pixel voltage negative polarity, i.e. V128-, when V128+=V128-, picture is under the minimum state of flicker.When picture showed different GTG, 0 GTG for example was because liquid crystal capacitance is under different GTGs, the difference of its specific inductive capacity causes the variation of liquid crystal capacitance, and then influence is under different GTGs, the difference of feedthrough (feedthrough) voltage makes V0+ ≠ V0-on the pixel.Will cause the flicker of picture like this, and then the direct-current ion that produces causes the generation of image retention.

Prior art is regulated public electrode voltages because employing 128 GTGs are benchmark, and picture is under the minimum state of flicker (flicker).Like this, when picture is in non-128 GTGs, because the variation of liquid crystal specific inductive capacity, make the difference of feedthrough (feedthrough) voltage on the pixel, cause the difference that in fact obtains voltage on the pixel, therefore cause the voltage difference of pixel electrode when positive-negative polarity, cause the flicker of image quality, even produce image retention (image sticking).

The utility model content

Technical problem to be solved in the utility model provides a kind of display panels, by the data line voltage of each pixel output is adjusted flicker or the image retention that can avoid feedthrough feedthrough voltage to cause.

The utility model is to solve the problems of the technologies described above the technical scheme that adopts to provide a kind of display panels, comprising:

A plurality of pixels are rectangular distribution;

Many controlling grid scan lines are for each row pixel provides sweep signal;

Many data lines are for each row pixel provides data-signal;

Described controlling grid scan line links to each other with gate drivers, and described data line links to each other with data driver, and described gate drivers and data driver are driven by time schedule controller;

Wherein, described display panels also comprises a row virtual pixel and a voltage comparator, described voltage comparator comprises first input end, second input end and feedback output end, described first input end, second input end links to each other with described virtual pixel, and described feedback output end links to each other with described data driver.

Above-mentioned display panels, wherein, the first input end of described voltage comparator links to each other with the odd-numbered line of described virtual pixel, and second input end of described voltage comparator and the even number line of described virtual pixel link to each other.

Above-mentioned display panels, wherein, the first input end of described voltage comparator links to each other with the even number line of described virtual pixel, and second input end of described voltage comparator and the odd-numbered line of described virtual pixel link to each other.

The utility model contrast prior art has following beneficial effect: the display panels that the utility model provides, difference when measuring down the pixel voltage positive-negative polarity by voltage comparator, just make pixel electrode when the positive-negative polarity by the voltage of adjusting data line, be in the position of balance, make pixel electrode under any GTG all with public electrode voltages Vcom symmetry, thereby avoided the generation of flicker and image retention.

Description of drawings

Fig. 1 is the structural representation of available liquid crystal display panel.

Pixel voltage synoptic diagram when Fig. 2 is available liquid crystal display panel difference GTG.

Fig. 3 is the structural representation of display panels of the present utility model.

Fig. 4 is the structural representation of comparer of the present utility model.

Pixel voltage synoptic diagram when Fig. 5 is the different GTG of display panels of the present utility model.

Among the figure:

1 time schedule controller, 2 data drivers

3 gate drivers, 4 voltage comparators

Embodiment

The utility model is described in further detail below in conjunction with accompanying drawing and exemplary embodiments.

See also Fig. 3, display panels of the present utility model comprises a plurality of pixels, is the capable n column distribution of m; Many controlling grid scan line G1, G2...Gm is for each row pixel provides sweep signal; Many data line D1, D2...Dn is for each row pixel provides data-signal; Described controlling grid scan line links to each other with gate drivers 3, and described data line links to each other with data driver 2, and described gate drivers 3 and data driver 2 are driven by time schedule controller 1.Each pixel comprises liquid crystal capacitance Clc and storage capacitors Cst, and wherein liquid crystal capacitance Clc makes liquid crystal under the effect of pixel voltage, rotate, thus the transmitance of control light valve; Storage capacitors Cst keeps pixel voltage in a frame time constant.The gate terminal of each thin film transistor (TFT) (TFT) links to each other with gate line, and source terminal links to each other with data line, and drain electrode end links to each other with pixel electrode.The rightmost side of display panels is provided with a row virtual pixel and a voltage comparator 4 among the utility model embodiment.

The voltage comparator 4 that the utility model uses comprises first input end, second input end and feedback output end, see also Fig. 4, voltage comparator 4 is one to have the electronic component of data-handling capacity, and it has three ports, comprises first input end C1, second input end C2 and the feedback output end, described first input end, second input end links to each other with virtual pixel, and described feedback output end links to each other with data driver 2.Specifically, the grid of virtual pixel is controlled the switch of pixel by gate drivers 3; The source electrode of virtual pixel links to each other with data driver 2 by the Ddummy line, the drain electrode of the virtual pixel (not shown) that is connected with pixel electrode.The pixel electrode of each virtual pixel according to positive-negative polarity respectively with first input end C1, the second input end C2 links to each other.For example for row inversion driving pattern: odd-numbered line G1, G3, G5 ... the virtual pixel at place links to each other with the first input end C1 of voltage comparator 4; Even number line G2, G4, G6 ... the virtual pixel at place links to each other with the second input end C2 of voltage comparator 4.Certainly the parity rows connection exchanges and also can reach same effect, that is to say odd-numbered line G1, G3, G5 ... the virtual pixel at place can link to each other with the second input end C2 of voltage comparator 4; Even number line G2, G4, G6 ... the virtual pixel at place links to each other with the first input end C1 of voltage comparator 4.

It is benchmark that prior art adopts 128 GTGs, manual adjustments public electrode voltages Vcom, and under 128 GTGs, the minimum magnitude of voltage of flicker is made as public electrode voltages Vcom by eye-observation, and picture is under the minimum state of flicker (flicker).When picture is in non-128 GTGs, because the variation of liquid crystal specific inductive capacity, make and the difference of feedthrough (feedthrough) voltage on the pixel cause the difference that in fact obtains voltage on the pixel, therefore cause the voltage difference of pixel electrode when positive-negative polarity, cause the flicker of image quality.Be under the minimum state of flicker in order to adjust picture, the driving method of the display panels that the utility model provides is as follows: to each GTG, calculate in advance under this GTG, the pixel voltage during positive-negative polarity is to the difference of public electrode voltages; During normal the demonstration, each pixel is carried out the data voltage adjustment according to its current output GTG, the pixel voltage when making positive-negative polarity all equates the difference of public electrode voltages.

Next the display panels that provides in conjunction with the utility model specifically describes the implementation procedure of driving method:

A) to each GTG, open the controlling grid scan line G1 of each row successively, G2...Gm scans this panel;

B) first input end of voltage comparator 4 receives the magnitude of voltage of positive polarity, the average voltage VC1 when calculating pixel electrode being in positive polarity under this GTG;

C) second input end of voltage comparator 4 receives the magnitude of voltage of negative polarity, the average voltage VC2 when calculating pixel electrode being in negative polarity under this GTG;

D) calculate under this GTG, the pixel voltage during positive-negative polarity to the difference of public electrode voltages (| Vc1-Vcom|-|Vcom-Vc2|), the feedback output end by voltage comparator 4 feeds back to data driver 2 with this magnitude of voltage then;

E) to each GTG, circulation step a)～d), the voltage differences when data driver 2 is noted the positive-negative polarity of each GTG correspondence (| Vc1-Vcom|-|Vcom-Vc2|);

See also Fig. 5, carry out the data voltage adjustment during to GTG 128 output, make V128+=V128-; In like manner, also carry out the data voltage adjustment during to GTG 0 output, make V0+=V0-.Because the utility model is all adjusted the data line voltage of each pixel output, under different GTGs, no matter pixel electrode is in positive polarity or negative polarity, and its difference with public electrode voltages Vcom all equates.

In sum, pixel voltage was to the difference of common electric voltage Vcom when the utility model was measured positive-negative polarity under each GTG by voltage comparator 4 in advance, and feed back to data driver 2, during normal the demonstration, data driver 2 is adjusted the data line voltage of each pixel output, therefore flicker or the image retention that can avoid feedthrough feedthrough voltage to cause.

Though the utility model discloses as above with preferred embodiment; right its is not in order to limit the utility model; any those skilled in the art; in not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.

Claims

1, a kind of display panels comprises:

A plurality of pixels are rectangular distribution;

Many controlling grid scan lines are for each row pixel provides sweep signal;

Many data lines are for each row pixel provides data-signal;

It is characterized in that, described display panels also comprises a row virtual pixel and a voltage comparator, described voltage comparator comprises first input end, second input end and feedback output end, described first input end, second input end links to each other with described virtual pixel, and described feedback output end links to each other with described data driver.

2, display panels according to claim 1 is characterized in that, the first input end of described voltage comparator links to each other with the odd-numbered line of described virtual pixel, and second input end of described voltage comparator and the even number line of described virtual pixel link to each other.

3, display panels according to claim 1 is characterized in that, the first input end of described voltage comparator links to each other with the even number line of described virtual pixel, and second input end of described voltage comparator and the odd-numbered line of described virtual pixel link to each other.