CN101814278A - Dual-gate liquid crystal display device and driving method thereof - Google Patents
Dual-gate liquid crystal display device and driving method thereof Download PDFInfo
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- CN101814278A CN101814278A CN 201010146208 CN201010146208A CN101814278A CN 101814278 A CN101814278 A CN 101814278A CN 201010146208 CN201010146208 CN 201010146208 CN 201010146208 A CN201010146208 A CN 201010146208A CN 101814278 A CN101814278 A CN 101814278A
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Abstract
The invention relates to a dual-gate liquid crystal display device and a driving method thereof, and the driving method of the dual-gate liquid crystal display device adjusts main charging time and pre-charging time according to the polarity of data driving signals of a pixel unit in a main charging period and a pre-charging period to enable the pixel unit to have enough time to reach target potential. And simultaneously, the driving method utilizes an output feedback signal to control the time for the data driving signal to be written in the pixel unit in the main charging period, thus enabling the charge quantity written in each pixel unit to be equal. The device and the method solve the problem that bad picture display of the pixel units in the liquid crystal display device owing to undercharge.
Description
Technical field
The present invention is relevant to a kind of dual-gate liquid crystal display device and driving method thereof, refers to a kind of dual-gate liquid crystal display device and driving method thereof that improves display quality especially.
Background technology
LCD (liquidcrystaldisplay, LCD) have low radiation, volume is little and advantage such as low power consuming, replace traditional cathode-ray tube (CRT) (cathoderaytube gradually, CRT) display, and then be widely used in mobile computer, personal digital assistant (personaldigitalassistant, PDA), flat-surface television, or on the information products such as mobile phone.The type of drive of LCD generally can use time schedule controller (timingcontroller) to produce various controlling signal, makes source electrode drive circuit (sourcedriver) and gate drive circuit (gatedriver) can drive pixel on the panel according to this with show image.According to the difference of drive pattern, liquid crystal display panel pixel structure mainly can be divided into two kinds of single lock type (single-gate) dot structure and double-gate type (double-gate) dot structures.Under identical resolution, compared to the display panels that adopts single lock type dot structure, adopt the gate line number of the display panels of double-gate type dot structure can increase twice, the data line number then can be reduced to 1/2nd, therefore adopts the display panels of double-gate type dot structure to use more gate drive chip and less source driving chip.Because the cost and the power consumption of gate drive chip are low than source driving chip all, therefore adopt the design of double-gate type dot structure can reduce production costs and power consumption.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram that adopts the liquid crystal indicator 100 of double-gate type dot structure in the prior art.Liquid crystal indicator 100 comprises a display panels 110, one source pole driving circuit 120, a gate drive circuit 130, and time schedule controller 140.Display panels 110 is provided with a plurality of data lines DL
1～DL
m, a plurality of gate lines GL
1～GL
n, and a picture element matrix.Picture element matrix comprises a plurality of pixel cell P
LAnd P
R, each pixel cell comprises a thin film transistor switch TFT, a liquid crystal capacitance C
LCWith a storage capacitors C
ST, be respectively coupled to corresponding data line, corresponding gate line, and a common voltage V
COMIn liquid crystal indicator 100, two adjacent capable pixel cell P
LAnd P
RBe coupled to same corresponding data line, wherein odd-numbered line pixel cell P
LBe coupled to corresponding odd number bar gate line GL
1, GL
3..., GL
N-1, and even number line pixel cell P
RThen be coupled to corresponding even number bar gate line GL
2, GL
4..., GL
n
Please refer to Fig. 2, the sequential chart when Fig. 2 is liquid crystal indicator 100 running of prior art.Fig. 2 has shown bolt-lock pulse signal TP, gate trigger signal SG
1～SG
4, and the current potential V of pixel cell
+-, V
--, V
-+, V
++Bolt-lock pulse signal TP is equifrequent pulse signal, is used for allowing each cycle interior pixel unit that fixedly duration of charging T is all arranged
ONV
+-, V
--, V
-+, V
++Represent the two adjacent pixel cell P that are coupled to same data line in a certain row pixel cell
LAnd P
RCurrent potential.Suppose in period T 1～T5, the data-driven signal present in regular turn positive polarity, negative polarity, negative polarity, positive polarity and positive polarity (by among Fig. 2 "+" and "-" represent).To be coupled to gate line GL
1～GL
4Two row pixel cells explain: in period T 1, gate trigger signal SG
1Tool activation current potential (noble potential), positive polarity data-driven signal can see through the transistor switch TFT of conducting to the odd-numbered line pixel cell P in the first row pixel cell
LCarry out precharge; In period T 2, gate trigger signal SG
1And SG
2While tool activation current potential, negative polarity data-driven signal can see through the transistor switch TFT of conducting to the odd-numbered line pixel cell P in the first row pixel cell
LLead charging, simultaneously to the even number line pixel cell P in the first row pixel cell
RCarry out precharge; In period T 3, gate trigger signal SG
2And SG
3While tool activation current potential, negative polarity data-driven signal can see through the transistor switch TFT of conducting to the even number line pixel cell P in the first row pixel cell
RLead charging, simultaneously to the odd-numbered line pixel cell P in the secondary series pixel cell
LCarry out precharge; In period T 4, gate trigger signal SG
3And SG
4While tool activation current potential, positive polarity data-driven signal can be to the odd-numbered line pixel cell P in the secondary series pixel cell
LLead charging, simultaneously to the even number line pixel cell P in the secondary series pixel cell
RCarry out precharge; In period T 5, gate trigger signal SG
4Tool activation current potential, positive polarity data-driven signal can see through the transistor switch TFT of conducting to the even number line pixel cell P in the secondary series pixel cell
RLead charging.
In other words, the odd-numbered line pixel cell P in the first row pixel cell
LBe to receive positive polarity data-driven signal in its precharge cycle T1, then receive negative polarity data-driven signal in its main charge cycle T2, its current potential can be by V
+-Represent; Even number line pixel cell P in the first row pixel cell
RAll receive negative polarity data-driven signal in its precharge cycle T2 and main charge cycle T3, its current potential can be by V
--Represent; Odd-numbered line pixel cell P in the secondary series pixel cell
LBe to receive negative polarity data-driven signal in its precharge cycle T3, then receive positive polarity data-driven signal in its main charge cycle T4, its current potential can be by V
-+Represent; Even number line pixel cell P in the secondary series pixel cell
RAll receive positive polarity data-driven signal in its precharge cycle T2 and main charge cycle T3, its current potential is by V
++Represent.
If pixel cell is identical with gate liquid crystal in its main charging, pixel cell has the enough time and reaches predetermined voltage (as V
++And V
--Shown in), write the quantity of electric charge of pixel cell this moment and represent by the hatched example areas that A2 and A4 indicated among Fig. 2.If pixel cell is opposite with gate liquid crystal in its main charging, pixel cell needs a period of time reversal potential to reach predetermined voltage (as V
+-And V
-+Shown in), write the quantity of electric charge of pixel cell this moment and represent by the hatched example areas that A1 and A3 indicated among Fig. 2.As shown in Figure 2, at the image of same GTG value, some pixel cell can cause picture to show because of undercharge (area of A1 and A3 is less than the area of A2 and A4) bad.
Summary of the invention
The object of the present invention is to provide a kind of dual-gate liquid crystal display device and driving method thereof, solved that pixel cell can cause the bad problem of picture demonstration because of undercharge in the liquid crystal indicator.
A kind of driving method of dual-gate liquid crystal display device, it comprises: export the first data-driven signal in the period 1, and then first pixel cell is carried out precharge; The output second data-driven signal in second round after this period 1 of continuing, and then this first pixel cell led charging, simultaneously second pixel cell is carried out precharge, wherein this first pixel cell system is coupled to a data line and first gate line, and this second pixel cell system is coupled to this data line and second gate line; Export one the 3rd data-driven signal in period 3 after this second round of continuing, and then this second pixel cell is led charging; And the main duration of charging of adjusting this first pixel cell in precharge time of this first pixel cell in this period 1 and this second round according to the polarity of this first data-driven signal and this second data-driven signal; And adjust that this second data-driven signal writes time of this first pixel cell and the 3rd data-driven signal writes the time of this second pixel cell, and then equated in the main duration of charging of this second pixel cell in main duration of charging of this first pixel cell in this second round and this period 3.
A kind of dual-gate liquid crystal display device, it comprises first gate line, is used for transmitting first gate trigger signal; Second gate line, adjacent and be parallel to this first gate line, be used for transmitting second gate trigger signal; One data line perpendicular to this first and second gate line, is used for transmitting one first data-driven signal and one second data-driven signal; First pixel cell is coupled to this data line and this first gate line, and it comes display frame according to this first gate trigger signal and this first data-driven signal in the period 1; Second pixel cell is coupled to this data line and this second gate line, in its second round after this period 1 of continuing according to this second gate trigger signal and this second data-driven signal with display frame; One gate drive circuit, it exports this first gate trigger signal and this second gate trigger signal according to bolt-lock pulse signal and output enable signal; Source electrode drive circuit, it produces this first data-driven signal and this second data-driven signal according to image data; And time schedule controller.This time schedule controller comprises a judging unit, and whether the duration of charging that its polarity according to this first data-driven signal and this second data-driven signal is judged first pixel cell and this second pixel cell pixel cell is enough; And adjustment circuit, its judged result according to this judging unit is adjusted this bolt-lock pulse signal and this output enable signal, makes the quantity of electric charge that writes this first pixel cell in this period 1 and the quantity of electric charge that writes this second pixel cell in this second round equate.
The invention solves in the liquid crystal indicator some pixel cells and can cause the bad problem of picture demonstration because of undercharge, the present invention makes the pixel cell in the liquid crystal indicator have the enough time to reach the target current potential, the quantity of electric charge that writes each pixel cell all can be equated, improved the quality that picture shows.
Description of drawings
Fig. 1 is the synoptic diagram of a kind of double-gate type liquid crystal indicator in the prior art.
Fig. 2 is the sequential chart in liquid crystal indicator when running of prior art.
Fig. 3 is the synoptic diagram of a kind of double-gate type liquid crystal indicator among the present invention.
Fig. 4 is the sequential chart when a kind of double-gate type liquid crystal indicator operates among the present invention.
Accompanying drawing meets explanation:
100,200 liquid crystal indicators; 110,210 display panels;
120,220 source electrode drive circuits; 130,230 gate drive circuits;
140,240 time schedule controllers; P
L, P
RPixel cell;
250 judging units; 260 adjust circuit;
DL
1～DL
mData line; GL
1～GL
nGate line;
C
LCLiquid crystal capacitance; C
STStorage capacitors;
V
COMCommon voltage; The TFT thin film transistor switch.
Embodiment
Please refer to Fig. 3, Fig. 3 is for adopting the synoptic diagram of double-gate type liquid crystal indicator 200 among the present invention.Liquid crystal indicator 200 comprises display panels 210, source electrode drive circuit 220, gate drive circuit 230, and time schedule controller 240.Display panels 210 is provided with a plurality of data lines DL
1～DL
m, a plurality of gate lines GL
1～GL
n, and picture element matrix.Picture element matrix comprises a plurality of pixel cell P
LAnd P
R, each pixel cell comprises a thin film transistor switch TFT, a liquid crystal capacitance C
LCWith a storage capacitors C
ST, be respectively coupled to corresponding data line, corresponding gate line, and a common voltage V
COMIn liquid crystal indicator 200, two adjacent capable pixel cell P
LAnd P
RBe coupled to same corresponding data line, wherein be arranged at the odd-numbered line pixel cell P in data line left side
LBe coupled to corresponding odd number bar gate line GL
1, GL
3..., GL
N-1, and be arranged at the even number line pixel cell P on data line right side
RThen be coupled to corresponding even number bar gate line GL
2, GL
4..., GL
n
Please refer to Fig. 4, the sequential chart when Fig. 4 operates for double-gate type liquid crystal indicator 200 of the present invention.Fig. 4 has shown bolt-lock pulse signal TP ', output enable signal OE, gate trigger signal SG
1～SG
4, and the current potential V of pixel cell
+-, V
--, V
-+, V
++Adjust circuit 260 and can adjust the pulsed frequency of bolt-lock pulse signal TP ', so can there be the duration of charging T of different length each cycle interior pixel unit
ON1～T
ON5V
+-, V
--, V
-+, V
++Represent the two adjacent pixel cell P that are coupled to same data line in a certain row pixel cell
LAnd P
RCurrent potential.Suppose in period T 1～T5, the data-driven signal present in regular turn positive polarity, negative polarity, negative polarity, positive polarity and positive polarity (by among Fig. 4 "+" and "-" represent).To be coupled to gate line GL
1～GL
4Two row pixel cells explain: in period T 1, gate trigger signal SG
1Tool activation current potential (noble potential), positive polarity data-driven signal can see through the transistor switch TFT of conducting to the odd-numbered line pixel cell P in the first row pixel cell
LCarry out precharge; In period T 2, gate trigger signal SG
1And SG
2While tool activation current potential, negative polarity data-driven signal can see through the transistor switch TFT of conducting to the odd-numbered line pixel cell P in the first row pixel cell
LLead charging, simultaneously to the even number line pixel cell P in the first row pixel cell
RCarry out precharge; In period T 3, gate trigger signal SG
2And SG
3While tool activation current potential, negative polarity data-driven signal can see through the transistor switch TFT of conducting to the even number line pixel cell P in the first row pixel cell
RLead charging, simultaneously to the odd-numbered line pixel cell P in the secondary series pixel cell
LCarry out precharge; In period T 4, gate trigger signal SG
3And SG
4While tool activation current potential, positive polarity data-driven signal can be to the odd-numbered line pixel cell P in the secondary series pixel cell
LLead charging, simultaneously to the even number line pixel cell P in the secondary series pixel cell
RCarry out precharge; In period T 5, gate trigger signal SG
4Tool activation current potential, positive polarity data-driven signal can see through the transistor switch TFT of conducting to the even number line pixel cell P in the secondary series pixel cell
RLead charging.
To the odd-numbered line pixel cell P in the first row pixel cell
L, system receives positive polarity data-driven signal in its precharge cycle T1, and is to receive negative polarity data-driven signal in its main charge cycle T2, and its current potential can be by V
+-Represent.Judge main charging when opposite when judging unit 250, adjust the pulsed frequency that circuit 260 can adjustment bolt-lock pulse signal TP ', allow the duration of charging T of pixel cell in precharge cycle T1 with gate liquid crystal
ON1Be shorter than the duration of charging T in main charge cycle T2
ON2, and then shorten the required time of reversal potential.Simultaneously, adjust circuit 260 and also can adjust the quantity of electric charge B1 that writes pixel cell through output enable signal OE.
To the even number line pixel cell P in the first row pixel cell
R, all receiving negative polarity data-driven signal in its precharge cycle T2 and the main charge cycle T3, its current potential can be by V
--Represent.Judge main charging when identical when judging unit 250, adjust the pulsed frequency that circuit 260 can adjustment bolt-lock pulse signal TP ', allow the duration of charging T of pixel cell in precharge cycle T2 with gate liquid crystal
ON2Be longer than the duration of charging T in main charge cycle T3
ON3, also can see through output enable signal OE simultaneously and adjust the quantity of electric charge B2 that writes pixel cell.
To the odd-numbered line pixel cell P in the secondary series pixel cell
L, system receives negative polarity data-driven signal in its precharge cycle T3, and is to receive positive polarity data-driven signal in its main charge cycle T4, and its current potential can be by V
-+Represent.Judge main charging when opposite when judging unit 250, adjust the pulsed frequency that circuit 260 can adjustment bolt-lock pulse signal TP ', allow the duration of charging T of pixel cell in precharge cycle T3 with gate liquid crystal
ON3Be shorter than the duration of charging T in main charge cycle T4
ON4, and then shorten the required time of reversal potential.Simultaneously, adjust circuit 260 and also can adjust the quantity of electric charge B3 that writes pixel cell through output enable signal OE.
To the even number line pixel cell P in the secondary series pixel cell
R, all receiving positive polarity data-driven signal in its precharge cycle T4 and the main charge cycle T5, its current potential can be by V
++Represent.Judge main charging when identical when judging unit 250, adjust the pulsed frequency that circuit 260 can adjustment bolt-lock pulse signal TP ', allow the duration of charging T of pixel cell in precharge cycle T4 with gate liquid crystal
ON4Be longer than the duration of charging T in main charge cycle T5
ON5, also can see through output enable signal OE simultaneously and adjust the quantity of electric charge B4 that writes pixel cell.
As shown in Figure 4, pixel cell which kind of polarity of data-driven signal tool in main charge cycle and precharge cycle no matter, the present invention can adjust main duration of charging and precharge time according to type of drive, makes pixel cell have the enough time to reach the target current potential.Simultaneously, the present invention also provides output enable signal OE to control the time (for example the data-driven signal just can write pixel cell when output enable signal OE tool electronegative potential) that the interior data-driven signal of main charge cycle writes pixel cell, the quantity of electric charge that writes each pixel cell all can be equated, therefore can improve the picture display quality.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (7)
1. the driving method of a dual-gate liquid crystal display device, it comprises:
In the period 1, export the first data-driven signal, and then first pixel cell is carried out precharge;
The output second data-driven signal in second round after this period 1 of continuing, and then this first pixel cell led charging, simultaneously second pixel cell is carried out precharge, wherein this first pixel cell is coupled to a data line and first gate line, and this second pixel cell system is coupled to this data line and second gate line;
Export the 3rd data-driven signal in period 3 after this second round of continuing, and then this second pixel cell is led charging; And the main duration of charging of adjusting this first pixel cell in precharge time of this first pixel cell in this period 1 and this second round according to the polarity of this first data-driven signal and this second data-driven signal; And adjust that this second data-driven signal writes time of this first pixel cell and the 3rd data-driven signal writes the time of this second pixel cell, and then equated in the main duration of charging of this second pixel cell in main duration of charging of this first pixel cell in this second round and this period 3.
2. the driving method of a kind of dual-gate liquid crystal display device according to claim 1, it comprises in addition: when the polarity of this first data-driven signal and this second data-driven signal is opposite, shortens the precharge time of this first pixel cell in this period 1 and increase main duration of charging of this first pixel cell in this second round.
3. the driving method of a kind of dual-gate liquid crystal display device according to claim 1, it comprises in addition: when the polarity of this first data-driven signal and this second data-driven signal is identical, increases the precharge time of this first pixel cell in this period 1 and shorten main duration of charging of this first pixel cell in this second round.
4. the driving method of a kind of dual-gate liquid crystal display device according to claim 1, it comprises in addition: this second data-driven signal of output is to carry out precharge to the 3rd pixel cell in this period 3, and wherein the 3rd pixel cell is coupled to this data line and the 3rd gate line.
5. the driving method of a kind of dual-gate liquid crystal display device according to claim 4, it comprises in addition: the main duration of charging of adjusting this second pixel cell in precharge time of this second pixel cell in this second round and this period 3 according to the polarity of this second data-driven signal and the 3rd data-driven signal.
6. liquid crystal indicator that adopts double-gate utmost point driving framework, it comprises:
First gate line is used for transmitting first gate trigger signal;
Second gate line, adjacent and be parallel to this first gate line, be used for transmitting second gate trigger signal;
Data line perpendicular to this first and second gate line, is used for transmitting the first data-driven signal and the second data-driven signal;
First pixel cell is coupled to this data line and this first gate line, and it comes display frame according to this first gate trigger signal and this first data-driven signal in the period 1;
Second pixel cell is coupled to this data line and this second gate line, in its second round after this period 1 of continuing according to this second gate trigger signal and this second data-driven signal with display frame;
Gate drive circuit, it exports this first gate trigger signal and this second gate trigger signal according to a bolt-lock pulse signal and an output enable signal;
Source electrode drive circuit, it produces this first data-driven signal and this second data-driven signal according to an image data;
Time schedule controller, it comprises:
Judging unit, whether the duration of charging that its polarity according to this first data-driven signal and this second data-driven signal is judged first pixel cell and this second pixel cell pixel cell is enough; And
Adjust circuit, its judged result according to this judging unit is adjusted this bolt-lock pulse signal and this output enable signal, makes the quantity of electric charge that writes this first pixel cell in this period 1 and the quantity of electric charge that writes this second pixel cell in this second round equate.
7. a kind of liquid crystal indicator that adopts double-gate utmost point driving framework according to claim 6, wherein
This first pixel cell comprises:
The first film transistor switch, it comprises:
One control end is coupled to this first gate line;
First end is coupled to this data line; And
Second end;
First liquid crystal capacitance is coupled between transistorized second end of this first film and the common voltage; And
First storage capacitors is coupled between transistorized second end of this first film and this common voltage; And
This second pixel cell comprises:
Second thin film transistor switch, it comprises:
Control end is coupled to this second gate line;
First end is coupled to this data line; And
Second end;
Second liquid crystal capacitance is coupled between second end and this common voltage of this second thin film transistor (TFT); And
Second storage capacitors is coupled between second end and this common voltage of this second thin film transistor (TFT).
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|---|---|---|---|
| CN 201010146208 CN101814278B (en) | 2010-04-14 | 2010-04-14 | Dual-gate liquid crystal display device and driving method thereof |
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|---|---|---|---|
| CN 201010146208 CN101814278B (en) | 2010-04-14 | 2010-04-14 | Dual-gate liquid crystal display device and driving method thereof |
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| CN101814278B CN101814278B (en) | 2013-01-09 |
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| CN103680454A (en) * | 2013-12-20 | 2014-03-26 | 深圳市华星光电技术有限公司 | Display device and display driving method |
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| CN102074181B (en) * | 2010-09-07 | 2013-07-03 | 福建华映显示科技有限公司 | Time sequence control method of display panel |
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| CN107507575A (en) * | 2017-10-24 | 2017-12-22 | 惠科股份有限公司 | Display device and driving method and driving system thereof |
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| CN109377927B (en) * | 2018-11-05 | 2022-03-01 | Oppo（重庆）智能科技有限公司 | Driving method, driving circuit, display panel and storage medium |
| CN109658869A (en) * | 2019-01-30 | 2019-04-19 | 惠科股份有限公司 | Display panel, driving method and display device |
| WO2020155216A1 (en) * | 2019-01-30 | 2020-08-06 | 惠科股份有限公司 | Display panel, driving method for display panel and display device |
| US12014699B2 (en) | 2019-01-30 | 2024-06-18 | HKC Corporation Limited | Display panel, display panel driving method, and display device |
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