CN101620832B - Liquid crystal display and switching voltage control circuit thereof - Google Patents
Liquid crystal display and switching voltage control circuit thereof Download PDFInfo
- Publication number
- CN101620832B CN101620832B CN2008101293930A CN200810129393A CN101620832B CN 101620832 B CN101620832 B CN 101620832B CN 2008101293930 A CN2008101293930 A CN 2008101293930A CN 200810129393 A CN200810129393 A CN 200810129393A CN 101620832 B CN101620832 B CN 101620832B
- Authority
- CN
- China
- Prior art keywords
- voltage
- current
- transmission line
- controlled switch
- gate drivers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
本发明公开了一种液晶显示器及其开关电压控制电路。液晶显示器包括显示面板与多个栅极驱动器。开关电压控制电路包括电流控制开关、传输线与反馈电路。电流控制开关的第一端与第二端分别耦接定电压与传输线的第一端。传输线串接栅极驱动器。栅极驱动器依据传输线所提供的电压产生开关电压，并据以控制显示面板的像素单元。反馈电路依据传输线第一端与第二端之间的电压差，调整通过电流控制开关的电流量。因此可减少显示面板的区块色差。
The present invention discloses a liquid crystal display and a switch voltage control circuit thereof. The liquid crystal display includes a display panel and a plurality of gate drivers. The switch voltage control circuit includes a current control switch, a transmission line and a feedback circuit. The first end and the second end of the current control switch are respectively coupled to a constant voltage and the first end of the transmission line. The transmission line is connected in series with the gate driver. The gate driver generates a switch voltage according to the voltage provided by the transmission line, and controls the pixel unit of the display panel accordingly. The feedback circuit adjusts the current passing through the current control switch according to the voltage difference between the first end and the second end of the transmission line. Therefore, the block color difference of the display panel can be reduced.
Description
Technical field
The invention relates to a kind of LCD, and particularly relevant for a kind of switching voltage control circuit of LCD.
Background technology
Flourish along with opto-electronics, (Liquid Crystal Display LCD) has been widely used in the various electric equipment products LCD.What deserves to be mentioned is that along with the size change of display panel is big, therefore the switching voltage that LCD is difficult to provide identical can cause display panel to have block color difference to each pixel cell, following conjunction with figs. is done further explanation.
Figure 1A is the synoptic diagram of known a kind of LCD.Figure 1B is the synoptic diagram of the pixel cell of known display panel.Please merge with reference to Figure 1A and Figure 1B, suppose that LCD 10 is to be the LCD of complete bright picture (Normally White) when liquid crystal does not drive.LCD 10 is made of display panel 40, multiple source driver 20 and a plurality of gate drivers (with 31,32,33 expressions).Source electrode driver 20 sees through source drive line 101 and couples each pixel cell 41.On the other hand, 31～33 of gate drivers see through grid drive wire 111 and couple each pixel cell 41.41 of pixel cells are made of with pixel capacitance 123 transistor 121, storage capacitors 122.
Fig. 2 is known a kind of source drive electric current I d and the graph of relation of switching voltage Vg.Please merge with reference to Figure 1A, Figure 1B and Fig. 2, gate drivers 31～33 receives decide voltage VGL, and produces switching voltage Vg according to this and use and control each pixel cell 41.It should be noted that because the transmission line 131 on the display panel 40 has line impedence, thus gate drivers 31 received decide voltage VGL can be slightly larger than gate drivers 32 received decide voltage VGL.In addition, gate drivers 32 is received decide voltage VGL also can be slightly larger than gate drivers 33 received decide voltage VGL.
The switching voltage Vg that said circumstances can cause gate drivers 33 to offer pixel cell 41 is slightly less than the switching voltage Vg that gate drivers 32 offers pixel cell 41, and the switching voltage Vg that gate drivers 32 offers pixel cell 41 also can be slightly less than the switching voltage Vg that gate drivers 31 offers pixel cell 41.Because the switching voltage Vg that display panel 40 each block are received is also inequality, therefore can cause display panel 40 to have block color difference.In more detail, when LCD 10 desires show picture with color stage, the pixel cell 41 of the gate drivers 33 of display panel 40 can be slightly bright in the pixel cell 41 of gate drivers 32, and the pixel cell 41 of the gate drivers 32 of display panel 40 can be slightly bright in the pixel cell 41 of gate drivers 31.For example, Fig. 3 has the synoptic diagram of block color difference for display panel.
Fig. 4 is the synoptic diagram of known another kind of LCD.In order to improve the block color difference problem of display panel, known a kind of improvement method proposed, promptly deciding to add a current-limiting resistance 141 between voltage VGL and the gate drivers 31.After the benefit of its practice is to add current-limiting resistance 141, it is big that the equivalent resistance of transmission line 131 can become, deciding under the constant situation of voltage VGL, the electric current that transmission line 131 is flowed through can diminish, so gate drivers 31, the 32 and 33 received pressure reduction of deciding voltage VGL can diminish.Thus, the difference of the switching voltage Vg that produced of gate drivers 31,32 and 33 also can reduce.So can eliminate the block color difference of display panel 40.
But when the condition of display panel 40 not simultaneously, then must use the current-limiting resistance 141 of different resistances, just can prevent the block color difference problem of display panel 40.That is to say that for multi-form display panel, each panel vendor must find out the current-limiting resistance of each display panel in examination mistake mode (Trial and Error), and is quite inconvenient.
Summary of the invention
The invention provides a kind of switching voltage control circuit, use the block color difference that reduces display panel.
The invention provides a kind of LCD, it is by the switching voltage control circuit that the invention described above proposed directly being implanted in wherein, using the block color difference of reaching the minimizing display panel.
The present invention proposes a kind of switching voltage control circuit, is applicable to LCD.LCD comprises display panel and a plurality of gate drivers.Display panel comprises a plurality of pixel cells.Switching voltage control circuit comprises current-controlled switch, transmission line and feedback circuit.Current-controlled switch has first end and second end, and its first end couples decides voltage.Transmission line has first end and second end, and its first end couples second end of current-controlled switch.Transmission line is connected in series above-mentioned gate drivers.Above-mentioned gate drivers produces switching voltage according to the voltage that transmission line provided, and controls pixel cell according to this.Feedback circuit couples transmission line and current-controlled switch.Feedback circuit is according to first end of transmission line and the voltage difference between second end, adjustment is by the magnitude of current of current-controlled switch, wherein, when first end of transmission line and the voltage difference between second end exceed default value, feedback circuit will be turned down by the magnitude of current of current-controlled switch.
In one embodiment of this invention, current-controlled switch is a transistor, and this transistor operates in active region.
In one embodiment of this invention, feedback circuit comprises first amplifier, first divider resistance, second divider resistance and second amplifier.The first input end of first amplifier and second input end couple first end and second end of transmission line respectively.First end of first divider resistance couples the output terminal of first amplifier.First end of second divider resistance and second end couple second end and first voltage of first divider resistance respectively.The first input end of second amplifier and second input end couple second end and second voltage of first divider resistance respectively.The output terminal output control voltage of second amplifier is used the magnitude of current of adjustment by current-controlled switch.In another embodiment, first voltage is ground voltage, and second voltage is greater than first voltage.
From another viewpoint, the invention provides a kind of LCD, and can reduce the block color difference of display panel with switching voltage control circuit that the invention described above proposes.
The present invention is because of adopting the voltage difference at feedback circuit monitoring transmission line two ends, and the flow through electric current of transmission line of control according to this, therefore can make transmission line provide close voltage to each driving circuit, so can reduce the block color difference of display panel.
For above-mentioned feature and advantage of the present invention can be become apparent, several embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Figure 1A is the synoptic diagram of known a kind of LCD.
Figure 1B is the synoptic diagram of the pixel cell of known display panel.
Fig. 2 is known a kind of source drive electric current I d and the graph of relation of switching voltage Vg.
Fig. 3 has the synoptic diagram of block color difference for display panel.
Fig. 4 is the synoptic diagram of known another kind of LCD.
Fig. 5 A is according to a kind of LCD of the first embodiment of the present invention and the synoptic diagram of switching voltage control circuit thereof.
Fig. 5 B is according to a kind of feedback circuit of the first embodiment of the present invention and the circuit diagram of current-controlled switch.
Fig. 6 is according to a kind of LCD of the second embodiment of the present invention and the synoptic diagram of switching voltage control circuit thereof.
Fig. 7 is according to the another kind of LCD of the second embodiment of the present invention and the synoptic diagram of switching voltage control circuit thereof.
Embodiment
First embodiment
Fig. 5 A is according to a kind of LCD of the first embodiment of the present invention and the synoptic diagram of switching voltage control circuit thereof.Please merge with reference to Fig. 5 A and Figure 1B, LCD 11 comprises display panel 40, a plurality of gate drivers (present embodiment with 31,32,33 expressions), multiple source driver 20 and switching voltage control circuit 50.Switching voltage control circuit 50 has comprised current-controlled switch 60, transmission line 70 and feedback circuit 80.Display panel 40 comprises a plurality of pixel cells 41.Source electrode driver 20 is configurable in the non-display area of display panel 40 with gate drivers 31～33.Source electrode driver 20 sees through source drive line 101 and couples each pixel cell 41.On the other hand, 31～33 of gate drivers see through grid drive wire 111 and couple each pixel cell 41.Source electrode driver 20 can be in order to control pixel cell 41 with gate drivers 31～33.Pixel cell 41 has comprised transistor 121, storage capacitors 122 and pixel capacitance 123.
Accept above-mentionedly, first end of current-controlled switch 60 and second end couple first end of deciding voltage VGL and transmission line 70 respectively.The control voltage Vc that current-controlled switch 60 can be provided according to feedback circuit 80 uses the flow through current Ib of current-controlled switch 60 of control.Transmission line 70 is connected in series gate drivers 31,32,33 in regular turn.Because transmission line 70 has line impedence, thus each gate drivers can along with and the transmission path decide between the voltage VGL more grow, its received voltage then can be lower.In more detail, because gate drivers 33 and decide transmission path between the voltage VGL, greater than gate drivers 32 and decide transmission path between the voltage VGL, greater than gate drivers 31 and decide transmission path between the voltage VGL.Therefore gate drivers 33 is from the received voltage of transmission line 70, less than gate drivers 32 from the received voltage of transmission line 70, less than gate drivers 30 from the received voltage of transmission line 70.
Because gate drivers 31～33 can be used control pixel cell 41 according to producing switching voltage Vg from transmission line 70 received voltages.Therefore if each gate drivers when transmission line 70 received voltages have the difference of certain degree, can cause display panel 40 to produce block color difference.Based on Ohm law, if current Ib is littler, the line impedence of transmission line 70 then more is not easy to have influence on the received voltage of each gate drivers, and in other words each gate drivers is from transmission line 70 received voltages and can be more close.(annotating: described switching voltage general reference open voltage of this instructions or pass voltage)
In view of this, present embodiment utilizes feedback circuit 80 to come Control current Ib.The first input end of feedback circuit 80 and second input end couple first end and second end of transmission line 70 respectively.In other words, feedback circuit 80 can produce control voltage Vc and give current-controlled switch 60 according to first end of transmission line 70 and the voltage difference between second end, uses the size of adjusting current Ib.In more detail, when first end of transmission line 70 and the voltage difference between second end exceeded default value, 80 of feedback circuits can be turned current Ib down, use the block color difference problem that prevents display panel 40.Below provide a kind of feedback circuit 80 and the embodiment of current-controlled switch 60 to consider and examine for haveing the knack of art technology person.
Fig. 5 B is according to a kind of feedback circuit of the first embodiment of the present invention and the circuit diagram of current-controlled switch.Please refer to Fig. 5 B, in the present embodiment, current-controlled switch 60 is that example describes with transistor 221, and transistor 221 operates in active region.Along with the received control voltage Vc difference of the gate terminal of transistor 221, the current Ib of the transistor 221 of flowing through also can change thereupon.In more detail, in the present embodiment, when control voltage Vc became big, it is big that current Ib then can become thereupon; Otherwise when control voltage Vc diminished, current Ib then can diminish thereupon.
On the other hand, feedback circuit 80 comprises amplifier 201,202 and divider resistance 211,212.The first input end of amplifier 201 and second input end couple first end and second end of transmission line 70 respectively, and amplifier 201 can produce voltage Vx1 according to first end and the pressure reduction between second end of transmission line 70.In more detail, suppose that first end of transmission line 70 and the voltage of second end are respectively voltage Vop1 and voltage Vop2, then voltage Vx1=Vop1-Vop2.Because voltage Vop1 is greater than voltage Vop2, so voltage Vx1 can be greater than ground voltage GND.
First end of divider resistance 211 couples the output terminal of amplifier 201.First end of divider resistance 212 and second end couple second end and the ground voltage GND of divider resistance 211 respectively.Divider resistance 211,212 sees through the dividing potential drop theorem, can produce voltage Vx2 according to voltage Vx1, and wherein voltage Vx1 is greater than voltage Vx2.The first input end of amplifier 202 and second input end couple second end and the voltage Vr of divider resistance 211 respectively, and produce control voltage Vc according to this, wherein control voltage Vc=voltage Vr-voltage Vx2.Control voltage Vc can be in order to adjust the magnitude of current by current-controlled switch 60.Haveing the knack of art technology person can define voltage Vr voluntarily according to its demand, and voltage Vr must just can make control voltage Vc stable greater than ground voltage GND in the present embodiment.
Accept above-mentionedly, in the present embodiment, the benefit of utilizing divider resistance 211,212 to produce voltage Vx2 is, can be convenient to elasticity and adjust voltage Vx2.Because the line impedence between approximate end points P2 of the line impedence between end points P1 and the end points P3 and the end points P3.In other words, the pressure reduction between end points P1 and the end points P3 also can be similar to the pressure reduction between end points P2 and the end points P3.For the pressure reduction between accurate estimation end points P1 and the end points P3, so the divider resistance 211 and 212 of optional usefulness with similar resistance, voltage Vx2 is promptly representing the pressure reduction between end points P1 and the end points P3 thus.
Have the knack of art technology person and should be known in that above-mentioned Fig. 5 B only is a kind of selection embodiment of feedback circuit 80 and current-controlled switch 60, the present invention is not as limit.In other embodiments, have the knack of art technology person and also can comply with its demand, change above-mentioned embodiment, for example can select the divider resistance 211,212 of different resistances for use, implement present embodiment.
Referring again to Fig. 5 B, comprehensively above-mentioned, excessive when current Ib, the pressure reduction between end points P1 and the end points P3 then can become greatly, therefore can cause display panel 40 to produce the block color difference problem.At the same time, the resulting voltage Vx1 of voltage Vop1-voltage Vop2 also can become greatly, and voltage Vx2 also can become greatly, makes the resulting control voltage of voltage Vr-voltage Vx2 Vc diminish.Because the size of current Ib is relevant with control voltage Vc, therefore diminishes when controlling voltage Vc, current Ib also can diminish, and then makes the pressure reduction between end points P1 and the end points P3 diminish, and reaches the effect that pressure reduction between end points P1 and the end points P3 is stable at voltage Vr.
By another angle, too small when current Ib, the pressure reduction between end points P1 and the end points P3 then can diminish again.At the same time, the resulting voltage Vx1 of voltage Vop1-voltage Vop2 also can diminish, and voltage Vx2 also can diminish, and makes the resulting control voltage of voltage Vr-voltage Vx2 Vc become big.Because the size of current Ib is relevant with control voltage Vc, therefore become big as control voltage Vc, current Ib also can become greatly, so make between end points P1 and the end points P3 the pressure reduction change greatly, reach the effect that pressure reduction between end points P1 and the end points P3 is stable at voltage Vr.Can improve the block color difference problem of display panel 40 thus.
With in comparison known, present embodiment can prevent effectively that the display panel that causes has block color difference phenomenon in various degree because of using the current-limiting resistance of definite value.In addition, the feedback circuit framework of present embodiment can be applicable on the different size panel, and need not place the current-limiting resistance of different resistances at different panels in examination mistake mode.
What deserves to be mentioned is, though LCD and switching voltage control circuit thereof have been depicted a possible kenel in the foregoing description, usually know that the knowledgeable should know but have in the affiliated technical field, each manufacturer is all different for the design of LCD and switching voltage control circuit thereof, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as utilize feedback circuit to monitor pressure reduction between each gate drivers, and the flow through electric current of each gate drivers of control according to this, use the block color difference that reduces display surface, be to have met spiritual place of the present invention just.Below lift several embodiments again and know that usually the knowledgeable can further understand spirit of the present invention, and implement the present invention so that this area has.
Second embodiment
Have the knack of the cabling that art technology person can change transmission line 70 among first embodiment according to its demand.For example Fig. 6 is according to a kind of LCD of the second embodiment of the present invention and the synoptic diagram of switching voltage control circuit thereof.Please merge with reference to Fig. 5 B and Fig. 6, Fig. 6 and Fig. 5 B are similar, and the assembly that label is identical with Fig. 5 B among Fig. 6 can not repeat them here with reference to above-mentioned embodiment.It should be noted that transmission line 70 cablings among Fig. 6 are designed to through source electrode driver 20.Not only can make the configuration mode of transmission line 70 easy more thus, also can reach similar effect with first embodiment.Again for example, Fig. 7 is according to the another kind of LCD of the second embodiment of the present invention and the synoptic diagram of switching voltage control circuit thereof.Haveing the knack of art technology person only will be by the resistance ratio of adjusting divider resistance 211 and 212, and Fig. 7 also can reach the effect similar with Fig. 6.
In sum, the present invention adopts the voltage difference at feedback circuit monitoring transmission line two ends, and the flow through electric current of transmission line of control according to this, therefore can make transmission line provide close voltage to each driving circuit, so can reduce the block color difference of display panel.With in comparison known, embodiments of the invention can prevent effectively that the display panel that causes has block color difference phenomenon in various degree because of using the current-limiting resistance of definite value.In addition, the feedback circuit framework of embodiments of the invention can be applicable on the different size panel, and need not place the current-limiting resistance of different resistances at different panels in examination mistake mode.
Though the present invention discloses as above with several embodiment; right its 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; when can doing a little change and retouching, so protection scope of the present invention is when with being as the criterion that claim was defined.
Claims (8)
1. a switching voltage control circuit is applicable to a LCD, and this LCD comprises a display panel and a plurality of gate drivers, and this display panel comprises a plurality of pixel cells, and this switching voltage control circuit comprises:
One current-controlled switch has first end and second end, and its first end couples certain voltage;
One transmission line, have first end and second end, its first end couples second end of this current-controlled switch, and this transmission line is connected in series those gate drivers, wherein those gate drivers produce a switching voltage according to the voltage that this transmission line provided, and control those pixel cells according to this; And
One feedback circuit couples this transmission line and this current-controlled switch, and this feedback circuit is adjusted the magnitude of current by this current-controlled switch according to first end of this transmission line and the voltage difference between second end,
Wherein, when first end of this transmission line and the voltage difference between second end exceed a default value, this feedback circuit will be turned down by the magnitude of current of this current-controlled switch.
2. switching voltage control circuit as claimed in claim 1 is characterized in that, this current-controlled switch is a transistor, and this transistor operates in active region.
3. switching voltage control circuit as claimed in claim 1 is characterized in that, this feedback circuit comprises:
One first amplifier, its first input end and second input end couple first end and second end of this transmission line respectively;
One first divider resistance, its first end couples the output terminal of this first amplifier;
One second divider resistance, its first end and second end couple second end and one first voltage of this first divider resistance respectively; And
One second amplifier, its first input end and second input end couple second end and one second voltage of this first divider resistance respectively, and the output terminal output one control voltage of this second amplifier is used the magnitude of current of adjusting by this current-controlled switch.
4. switching voltage control circuit as claimed in claim 3 is characterized in that, this first voltage is ground voltage, and this second voltage is greater than this first voltage.
5. LCD comprises:
One display panel comprises a plurality of pixel cells;
A plurality of gate drivers couple those pixel cells;
One current-controlled switch has first end and second end, and its first end couples certain voltage;
One transmission line, its first end couples second end of this current-controlled switch, and this transmission line is connected in series those gate drivers, and wherein those gate drivers produce a switching voltage according to the voltage that this transmission line provided, and control those pixel cells according to this; And
One feedback circuit couples this transmission line and this current-controlled switch, and this feedback circuit is adjusted the magnitude of current by this current-controlled switch according to first end of this transmission line and the voltage difference between second end,
Wherein, when first end of this transmission line and the voltage difference between second end exceed a default value, this feedback circuit will be turned down by the magnitude of current of this current-controlled switch.
6. LCD as claimed in claim 5 is characterized in that, this current-controlled switch is a transistor, and this transistor operates in active region.
7. LCD as claimed in claim 5 is characterized in that, this feedback circuit comprises:
One first amplifier, its first input end and second input end couple first end and second end of this transmission line respectively;
One first divider resistance, its first end couples the output terminal of this first amplifier;
One second divider resistance, its first end and second end couple second end and one first voltage of this first divider resistance respectively; And
One second amplifier, its first input end and second input end couple second end and one second voltage of this first divider resistance respectively, and the output terminal output one control voltage of this second amplifier is used the magnitude of current of adjusting by this current-controlled switch.
8. LCD as claimed in claim 7 is characterized in that, this first voltage is ground voltage, and this second voltage is greater than this first voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101293930A CN101620832B (en) | 2008-06-30 | 2008-06-30 | Liquid crystal display and switching voltage control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101293930A CN101620832B (en) | 2008-06-30 | 2008-06-30 | Liquid crystal display and switching voltage control circuit thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101620832A CN101620832A (en) | 2010-01-06 |
| CN101620832B true CN101620832B (en) | 2011-07-13 |
Family
ID=41514040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101293930A Expired - Fee Related CN101620832B (en) | 2008-06-30 | 2008-06-30 | Liquid crystal display and switching voltage control circuit thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101620832B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9013385B2 (en) | 2012-09-29 | 2015-04-21 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Driving circuit of LCD panel, LCD panel, and LCD device |
| CN102855862B (en) * | 2012-09-29 | 2014-07-30 | 深圳市华星光电技术有限公司 | Driving circuit of liquid crystal panel, liquid crystal panel and liquid crystal display device |
| CN103915068B (en) | 2013-11-20 | 2016-04-20 | 上海中航光电子有限公司 | A kind of liquid crystal indicator |
| CN105590609B (en) * | 2016-03-11 | 2019-01-22 | 深圳市华星光电技术有限公司 | Driving method for liquid crystal display panel and liquid crystal display panel drive system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995000874A1 (en) * | 1993-06-18 | 1995-01-05 | Hitachi, Ltd. | Liquid crystal matrix display device and method of driving the same |
| CN1400489A (en) * | 2001-07-31 | 2003-03-05 | 佳能株式会社 | Scanning circuit and image display device |
-
2008
- 2008-06-30 CN CN2008101293930A patent/CN101620832B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995000874A1 (en) * | 1993-06-18 | 1995-01-05 | Hitachi, Ltd. | Liquid crystal matrix display device and method of driving the same |
| CN1400489A (en) * | 2001-07-31 | 2003-03-05 | 佳能株式会社 | Scanning circuit and image display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101620832A (en) | 2010-01-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9019256B2 (en) | Shift register and display apparatus that addresses performance problems caused by transistor leakage current | |
| JP3583356B2 (en) | Active matrix type liquid crystal display device, data signal line driving circuit, and driving method of liquid crystal display device | |
| CN101441845B (en) | Gamma reference voltage generating device and gamma voltage generating device | |
| CN110097859B (en) | Display panel and display device | |
| US20150015473A1 (en) | Display driving circuit and display device | |
| CN109410880B (en) | Display panel driving circuit | |
| CN101620832B (en) | Liquid crystal display and switching voltage control circuit thereof | |
| CN107610666A (en) | Eliminate the circuit and method of power-off ghost shadow | |
| JP4794542B2 (en) | Multi-grade electrical level drive | |
| US8477090B2 (en) | Liquid crystal display | |
| CN103488018A (en) | Liquid crystal display device and display control method thereof | |
| US20070024554A1 (en) | Driving apparatus for display device and display device including the same and method of driving the same | |
| US11088179B2 (en) | Liquid crystal display device | |
| CN102778796B (en) | A kind of thin-film transistor array base-plate and driving method thereof and liquid crystal display | |
| US20180233105A1 (en) | Display device | |
| US6919883B2 (en) | Charge characteristic compensating circuit for liquid crystal display panel | |
| US20160189654A1 (en) | Gate driver for providing variable gate-off voltage and display device including the same | |
| TWI406235B (en) | Liquid crystal display and switching voltage controlling circuit thereof | |
| CN109785811A (en) | A common voltage supply circuit, liquid crystal display panel and driving method thereof | |
| CN106531745B (en) | A kind of thin film transistor array substrate and liquid crystal panel | |
| CN109377958B (en) | Grid driving circuit based on temperature compensation and display | |
| CN107945764B (en) | Driving circuit of display panel, display device and driving method of display panel | |
| EP1860638A1 (en) | Liquid crystal display and control method of the same | |
| CN103021317B (en) | Driving circuit and display screen | |
| KR20100034242A (en) | Lcd driver |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110713 Termination date: 20200630 |