CN100472291C - Liquid crystal display - Google Patents
Liquid crystal display Download PDFInfo
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- CN100472291C CN100472291C CNB2007100883457A CN200710088345A CN100472291C CN 100472291 C CN100472291 C CN 100472291C CN B2007100883457 A CNB2007100883457 A CN B2007100883457A CN 200710088345 A CN200710088345 A CN 200710088345A CN 100472291 C CN100472291 C CN 100472291C
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Abstract
The invention provides a LCD, comprising LCD panel, gate drive circuit and data drive circuit. And the LCD panel has multiple pixel cells, multiple scan lines and multiple pairs of data lines, where each pixel cell is connected with a corresponding scan line and a corresponding data line and has two display regions connected with different data lines. In addition, the gate drive circuit is connected with multiple scan lines and the data drive circuit is connected with multiple data lines and has a voltage difference generator which is connected with multiple data lines to sustain a voltage difference between each pair of data lines. Therefore, the invention can simplify circuit signal processing complexity and reduce circuit cost.
Description
Technical field
The invention relates to a kind of display device, and particularly relevant for a kind of LCD.
Background technology
Existing market for Thin Film Transistor-LCD (thin film transistor liquid crystaldisplay, performance requirement TFT-LCD) all towards height contrast (high contrast ratio), no GTG reverse (no gray scale inversion), characteristics such as colour cast is little, brightness is high (high luminance), high color richness, high color saturation, rapid reaction and wide viewing angle.The technology that can reach the wide viewing angle requirement at present comprises that stable twisted nematic liquid crystal (TN) adds view film (wide viewing film), copline suitching type (in-plane switching, IPS) LCD, limit suitching type (fringe fieldswitching) LCD and multidomain vertical alignment type (multi-domain vertically alignment, MVA) mode such as Thin Film Transistor-LCD.
With the prior art multi-field vertical assigned LCD panel is example, because the orientation protrusion (alignment protrusion) or the slit (slit) that are formed on colored optical filtering substrates or the thin-film transistor array base-plate can be so that liquid crystal molecule be multi-direction arrangement, and obtain several different orientation fields (domain), so multi-field vertical assigned LCD panel can be reached the requirement of wide viewing angle.
Fig. 1 is the regular penetrance (normalized transmittance) of prior art multi-field vertical assigned LCD panel and the graph of a relation of GTG (gray level).Please refer to Fig. 1, horizontal ordinate is a GTG, and ordinate is regular penetrance.Because Fig. 1 as can be known, though the prior art multi-field vertical assigned LCD panel can be reached the requirement of wide viewing angle, yet along with the visual angle of observing changes, penetrance has different curvature to the curve (transmittance-level curve) of GTG.In other words, when the visual angle of observing changed, the shown brightness meeting that goes out of prior art multiple domain vertical orientation type liquid crystal display changed, and then causes colour cast (color shift) and color saturation deficiency problems such as (color washout).
In order to solve the problem of colour cast, existing multiple solution is suggested in succession.Wherein a kind of method is to increase by a data line in single pixel cell, and two pixel electrodes are set in single pixel cell.Individual other pixel electrode writes different data voltages by different data lines, makes that two pixel electrodes in single pixel cell have different electric fields, and then produces different Liquid Crystal Molecules Alignment, to reach the effect of eliminating colour cast.Though this kind mode can be improved color offset phenomenon,, make driving circuit become very complicated in design because required data line number doubles.
Fig. 2 is the synoptic diagram of prior art LCD.Please refer to Fig. 2, LCD 100 comprise a driving signal generator 110, a lookup unit 120 (Look-Up Table, LUT), a gate driver circuit 130, a data drive circuit 140, a driving voltage generator 150 and a display panels 160.As shown in Figure 2, view data is through behind the driving signal generator 110, the view data of system end can be converted to the required electrical form of data drive circuit 140 and gate driver circuit 130.The data voltage that data drive circuit 140 receives from driving voltage generator 150, and according to after lookup unit 120 shows signal that the data voltage generation of each input pixel is corresponding, in the reinfusate LCD panel 160.Therefore when the data line number doubled, the number of data drive circuit 140 and lookup unit 120 also doubled thereupon, and the processing memory space of required driving circuit is strengthened, and caused cost to increase.Simultaneously, transmit in signal Processing and signal, because the data line number increases, therefore driving signal generator 110 is aspect output signal, also need to increase for the number of signal wire and the demand of bandwidth thereupon, this makes the driving circuit device of LCD 100 be tending towards complicated, and lookup unit 120 makes the manufacturing cost of LCD 100 to reduce significantly.
Summary of the invention
The invention provides a kind of LCD, this LCD has simple drive circuit.
The invention provides a kind of LCD, this LCD comprises display panels, gate driver circuit and data drive circuit.Display panels has a plurality of pixel cells, multi-strip scanning line and many to data line, wherein each pixel cell and a corresponding sweep trace and corresponding pair of data lines electrically connect, and each pixel cell has two viewing areas, electrically connects with the different pieces of information line respectively.In addition, gate driver circuit and multi-strip scanning line electrically connect, data drive circuit and many data line is electrically connected, wherein data drive circuit has a pressure reduction generator, and pressure reduction generator and many to the data line electric connection, so that the voltage that two data lines in every pair of data lines are exported is kept a voltage difference.
In one embodiment of this invention, pixel cell also can be the semi-penetration, semi-reflective pixel cell.Each semi-penetration, semi-reflective pixel cell has a penetrating region and an echo area, and each semi-penetration, semi-reflective pixel cell comprises that one is disposed at transparency electrode, in the penetrating region and is disposed at reflecting electrode, one first active member and one second active member in the echo area.Wherein, transparency electrode electrically connects first active member, and reflecting electrode electrically connects second active member.
In one embodiment of this invention, the pressure reduction generator comprises boost loop, reduction voltage loop and a switch in parallel with the loop of boosting.Wherein, the wherein data line in switch and the every pair of data lines electrically connects, and switch switches on and boosts between loop and the reduction voltage loop.Particularly, after first voltage inputs to the pressure reduction generator, can produce second voltage of a higher voltage value by the loop of boosting, or produce second voltage of a lower voltage value by reduction voltage loop, then, again by switch will be wherein second voltage of a higher voltage value or second voltage transmission to the second data line of a lower voltage value.So every pair of data lines comprises one first data line, in order to transmitting one first voltage, and one second data line, in order to transmit boost a loop or second voltage that reduction voltage loop produced.
In one embodiment of this invention, LCD of the present invention comprises that also a polarity controller and pressure reduction generator electrically connect, and wherein polarity controller control switch boosts between loop and the reduction voltage loop so that switch switches on.
Hold above-mentioned, LCD of the present invention adopts the pressure reduction generator, and first voltage of importing according to data drive circuit, produce second voltage of a correspondence, by first data line and second data line respectively with first voltage and second voltage transmission two viewing areas to single pixel cell, make two viewing areas of interior each pixel cell of display panel can show different brightness, to improve the colour cast problem.Because the present invention need not use lookup unit to carry out the conversion of view data, so the present invention can reduce the complexity of driving circuit, reduces cost.
Description of drawings
Fig. 1 is the regular penetrance of prior art multi-field vertical assigned LCD panel and the graph of a relation of GTG.
Fig. 2 is the synoptic diagram of a kind of LCD of prior art.
Fig. 3 A is the synoptic diagram of a kind of multiple domain vertical orientation type liquid crystal display of the present invention.
Fig. 3 B is the synoptic diagram of a kind of semi-penetrated semi-reflected liquid crystal display of the present invention.
Fig. 4 is the circuit diagram of a kind of pressure reduction generator of the present invention.
Fig. 5 is the result according to a kind of optical analogy that the present invention carried out.
Drawing reference numeral
110: driving signal generator
120: lookup unit
130,220: gate driver circuit
140,230: data drive circuit
150: the driving voltage generator
160,210: display panels
200: LCD
212: pixel cell
214: sweep trace
216: pair of data lines
216a: first data line
216b: second data line
218a: first active member
218b: second active member
232: the pressure reduction generator
219T: transparency electrode
219R: reflecting electrode
318a: first active member
318b: second active member
232: the pressure reduction generator
240: the loop of boosting
250: reduction voltage loop
260: switch
270: polarity controller
A, B: viewing area
Δ V: voltage difference
Va: first voltage
Vb: second voltage
T: penetrating region
R: echo area
Embodiment
For the features and advantages of the present invention can be become apparent, preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
Fig. 3 A is the synoptic diagram of a kind of LCD of the present invention, and this LCD 200 can for example be a multiple domain vertical orientation type liquid crystal display.LCD 200 comprises display panels 210, gate driver circuit 220 and data drive circuit 230.Display panels 210 has a plurality of pixel cells 212, multi-strip scanning line 214 and many to data line 216, wherein each pixel cell 212 and a corresponding sweep trace 214 and corresponding pair of data lines 216 electrically connect, and each pixel cell 212 has two viewing area A, B to be controlled by the first active member 218a and the second active member 218b respectively, and receives the first voltage Va and the second voltage Vb that is transmitted from the first data line 216a and the second data line 216b respectively.In addition, gate driver circuit 220 electrically connects with sweep trace 214.Data drive circuit 230 electrically connects with data line 216, wherein data drive circuit 230 has a pressure reduction generator 232, and pressure reduction generator 232 electrically connects with data line 216, so that the voltages that two data line 216a, 216b in every pair of data lines 216 institute exports are individually kept a voltage difference △ V.Specifically, the voltage that is transmitted as data line 216a is the first voltage Va, the voltage that data line 216b is transmitted is the second voltage Vb, if switch 260 (as shown in Figure 4) switches to the loop 240 (as shown in Figure 4) of boosting, this moment, the second voltage Vb was that first voltage inputs to pressure reduction generator 232 backs are higher than the first voltage Va by one of loop 240 generations of boosting magnitude of voltage, if switch 260 switches to reduction voltage loop 250 (as shown in Figure 4), this moment, the second voltage Vb was that the first voltage Va inputs to the magnitude of voltage that one of reduction voltage loop 250 generations are lower than the first voltage Va.Because two viewing area A, B have different magnitudes of voltage, therefore the liquid crystal molecule of two viewing area A, B can be subjected to different electric field actions, makes Liquid Crystal Molecules Alignment different, to reach the effect of eliminating colour cast.
In one embodiment, the voltage difference △ V of design pressure difference generator 232 according to demand, make pressure reduction generator 232 can produce second a suitable voltage Vb, and export this second voltage Vb to second data line 216b according to the first voltage Va that data line 216a is transmitted.Hold above-mentioned, because the present invention need not use lookup unit 120 (as shown in Figure 2), only need utilize pressure reduction generator 232 can allow voltage that data line 216a and 216b transmitted difference to some extent, therefore, the present invention not only can significantly reduce the manufacturing cost of LCD 200, also can reduce the complexity of driving circuit in the LCD 200.
Except multiple domain vertical orientation type liquid crystal display, the design of data drive circuit 230 of the present invention also can be applicable to semi-penetrated semi-reflected liquid crystal display (transflective LCD), or in other similar LCD.
Fig. 3 B is the synoptic diagram of semi-penetrated semi-reflected liquid crystal display.Each pixel cell 212 has a penetrating region T and an echo area R, and each pixel cell 212 comprises that a transparency electrode 219T, who is disposed in the penetrating region T is disposed at echo area R interior reflecting electrode 219R, one first active member 318a and one second active member 318b.Wherein, reflecting electrode 219R and transparency electrode 219T be respectively by the first active member 318a and second active member 318b control, and receive the first pressure Va and the second voltage Vb that is transmitted from the first data line 216a and the second data line 216b respectively.
In the semi-penetrated semi-reflected liquid crystal display of Fig. 3 B, use data drive circuit 230 of the present invention, because inputing to the first voltage Va and the second voltage Vb of reflecting electrode 219R and through electrode 219T differs from one another, therefore the liquid crystal molecule of echo area R and penetrating region T can be subjected to different electric field actions, make Liquid Crystal Molecules Alignment different, and then the color that echo area R and penetrating region T are presented is approaching consistent, to improve the display quality of pixel cell 212.
Fig. 4 is the circuit diagram of a kind of pressure reduction generator of the present invention.In preferred embodiment of the present invention, pressure reduction generator 232 comprises boost loop 240, reduction voltage loop 250 and a switch 260 in parallel with the loop 240 of boosting.Wherein, switch 260 and the second data line 216b electrically connect, and switch 260 switches on and boosts between loop 240 and the reduction voltage loop 250.
Please continue with reference to figure 4, every pair of data lines 216 comprises one first data line 216a and one second data line 216b, wherein the first data line 216a is in order to transmit one first voltage Va, the second data line 216b is in order to transmit one second voltage Vb, if switch 260 switches to the loop 240 of boosting, this moment, the second voltage Vb was after the first voltage Va inputs to pressure reduction generator 232, was higher than the magnitude of voltage of the first voltage Va by one of loop 240 generations of boosting.In addition, if switch 260 switches to reduction voltage loop 250, this moment, the second voltage Vb was that the first voltage Va inputs to the magnitude of voltage that one of reduction voltage loop 250 generations are lower than the first voltage Va.The difference of the second voltage Vb and the first voltage Va is △ V.Absolute value that it should be noted that the voltage difference △ V that boost loop 240 and reduction voltage loop 250 set can be equal to each other, yet in other embodiments, the absolute value of the voltage difference △ V that sets in boost loop 240 and the reduction voltage loop 250 also can be unequal.Hold above-mentionedly, pressure reduction generator 232 can produce one second voltage Vb according to the one first voltage Va that the first data line 216a is transported in tendency to develop, and by switch 260 the second voltage Vb is transferred to the second data line 216b.But use the design of the present invention's simplified driving circuit, reduce the loaded down with trivial details data operation of data drive circuit 230, especially the demand of large-sized monitor increase day by day and the trend of high-res under, can significantly reduce the complexity of circuit, reduce cost.
In fact, no matter because LCD 200 type of drive are reversed (frame inversion) for point reverses (dot inversion), is listed as counter-rotating (row inversion), row counter-rotating (column inversion) or picture frame, the voltage of importing each pixel cell 212 by data line 216 can switch its polarity (polarization) along with each picture frame time (frame byframe).For fear of the film flicker of LCD 200, the LCD 200 of present embodiment comprises that also a polarity controller 270 controls under the opposed polarity, and the magnitude of voltage of the second voltage Vb is by boosting loop 240 or produced by reduction voltage loop 250.In detail, polarity controller 270 electrically connects with pressure reduction generator 232, and wherein polarity controller 270 control switchs 260 boost between loop 240 and the reduction voltage loop 250 so that switch 260 switches on according to pixel cell 212 different polarity.For example, if pixel cell 212 is a positive polarity, this moment, polarity controller 270 control switchs 260 switched to the loop 240 of boosting, this moment, the one second voltage Vb that is higher than the first voltage Va can transfer to the second data line 216b by switch 260, if pixel cell 212 is a negative polarity, this moment, polarity controller 270 control switchs 260 switched to reduction voltage loop 250, and this moment, the one second voltage Vb that is lower than the first voltage Va can transfer to the second data line 216b by switch 260.
Fig. 5 is the optical analogy result according to above-mentioned embodiment carried out, wherein voltage difference delta V is 1 volt, pixel cell designs for multidomain vertical alignment type, 5:5 among the figure, 4:6,3:7 is remarked pixel a-quadrant and the different area ratio in B zone respectively, as seen from the figure compared to the curve of gamma with great visual angle of prior art, use the present invention can obtain one than regular penetrance near ideal value curve (gamma=2.2), the present invention can reach better side-looking effect really, improve color offset phenomenon, and can pass through the area adjustment of voltage difference when, further the quality that shows is optimized.
In sum, the present invention adopts the pressure reduction generator, not only can reach the effect of improving colour cast, also can simplify the converse routine (as omitting lookup unit) that computing circuit shows GTG, significantly reduces the complexity of the data drive circuit of LCD.In addition, the present invention can also reduce provides the data volume of control signal to the driving signal generator of data drive circuit, for example reduce drift differential wave (RSDS), therefore not only can reduce circuit complexity and transmit usefulness to increase, reduce cost, on the display device of the following sweep frequency (for example 120Hz) that can also apply the present invention to high frequency value, to promote the display quality of picture.
Though the present invention discloses as above with preferred embodiment; but it is not in order to limit the present invention; have in the technical field under any and know the knowledgeable usually; without departing from the spirit and scope of the present invention; can do a little change and retouching, so protection scope of the present invention is when looking being as the criterion that claim defines.
Claims (4)
1. a LCD is characterized in that, this LCD comprises:
One display panels, have a plurality of pixel cells, multi-strip scanning line and many to data line, wherein each pixel cell and a corresponding sweep trace and corresponding pair of data lines electrically connect, and each pixel cell has two viewing areas and electrically connects with the different pieces of information line respectively;
One gate driver circuit electrically connects with described these sweep traces; And
One data drive circuit, with described these data line is electrically connected, wherein said data drive circuit has a pressure reduction generator, and this pressure reduction generator and described these electrically connect data line so that two data lines in every pair of data lines the voltages of indivedual transmission keep a voltage difference;
Described pressure reduction generator comprises:
One loop of boosting;
One reduction voltage loop, in parallel with the described loop of boosting; And
One switch, with the wherein data line electric connection in every pair of data lines, wherein said switch switches on described boosting between loop and the described reduction voltage loop.
2. LCD as claimed in claim 1 is characterized in that, described these pixel cells are the semi-penetration, semi-reflective pixel cell.
3. LCD as claimed in claim 1, it is characterized in that, every pair of data lines comprises one first data line and one second data line, wherein said first data line is used for transmitting one first voltage, described second data line and described switch electrically connect, and are used for transmitting one second voltage of described boost loop or the output of described reduction voltage loop.
4. LCD as claimed in claim 1, it is characterized in that, this LCD also comprises a polarity controller, electrically connect with described pressure reduction generator, wherein said polarity controller is controlled described switch, so that described switch switches on described boosting between loop and the described reduction voltage loop.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100883457A CN100472291C (en) | 2007-03-16 | 2007-03-16 | Liquid crystal display |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2007100883457A CN100472291C (en) | 2007-03-16 | 2007-03-16 | Liquid crystal display |
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| CN100472291C true CN100472291C (en) | 2009-03-25 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102646405A (en) * | 2012-05-17 | 2012-08-22 | 青岛海信电器股份有限公司 | Liquid crystal display refreshing method, liquid crystal display screen, display and television |
| CN102737580B (en) * | 2012-06-29 | 2015-06-17 | 昆山工研院新型平板显示技术中心有限公司 | Active matrix organic light emitting diode (AMOLED) display panel |
| CN104299592B (en) * | 2014-11-07 | 2016-11-23 | 深圳市华星光电技术有限公司 | Liquid crystal panel and driving method thereof |
| CN104867436B (en) * | 2015-05-25 | 2017-05-17 | 深圳市华星光电技术有限公司 | Driving circuit and method of driving display panel |
| CN105528999B (en) * | 2016-01-15 | 2018-05-08 | 合一智能科技（深圳）有限公司 | The display control method and device of liquid crystal display |
| CN106297716A (en) * | 2016-10-09 | 2017-01-04 | 武汉华星光电技术有限公司 | The data-driven method of a kind of display panels and system |
| CN109308867A (en) * | 2018-11-22 | 2019-02-05 | 惠科股份有限公司 | The driving method and its driving device of display panel, display device |
| CN110246454A (en) * | 2019-08-02 | 2019-09-17 | 苹果公司 | Display with the gate driver circuit system for including shared register circuit |
| CN113539205B (en) * | 2021-07-30 | 2022-07-29 | 深圳市华星光电半导体显示技术有限公司 | Pixel voltage determination method and device, electronic device and storage medium |
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