CN100582880C - LCD device and its drive circuit - Google Patents
LCD device and its drive circuit Download PDFInfo
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- CN100582880C CN100582880C CN200610157304A CN200610157304A CN100582880C CN 100582880 C CN100582880 C CN 100582880C CN 200610157304 A CN200610157304 A CN 200610157304A CN 200610157304 A CN200610157304 A CN 200610157304A CN 100582880 C CN100582880 C CN 100582880C
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- sweep trace
- thin film
- drive circuit
- tft
- film transistor
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Abstract
The present invention discloses a liquid crystal display, comprising a liquid crystal display panel. The liquid crystal display panel comprises a plurality of scan lines (G1-G2n, n is a natural number), a plurality of data lines in vertical insulating intersection with the scan lines, a plurality of thin film transistors positioned on the intersection parts of the scan lines and the data lines, a scan driving circuit for supplying a plurality of signals to a plurality of scan lines, a data driving circuit for supplying gray-scale voltage to a plurality of data lines when the scan lines are scanned, and a delay compensation circuit. When one scan line Gi ( I is more than or equal to 2 and less than or equal to 2n, i is a natural number) is scanned for opening the plurality of thin film transistors connected with the scan line Gi, the delay compensation circuit inputs opening compensation signals to the scan line Gi, and simultaneously inputs closing compensation signals to the other scan line Gi-1. The delay compensation accelerates the opening and closing of the plurality of thin film transistors. The present invention can prevent pictures from flickering. The present invention also comprises a driving circuit and driving method of the liquid crystal display.
Description
Technical field
The invention relates to a kind of LCD and driving circuit thereof and driving method.
Background technology
Along with LCD more and more widely is applied to every field, LCD presents a kind of to more large scale and the more trend of high resolving power development.And employing thin film transistor (TFT) (Thin Film Transistor, TFT) can there be the phenomenon that occurs the obvious delay of grid high potential signal and low-potential signal because wiring is long in LCD, be the gate delay phenomenon, thereby cause the problem of demonstration aspects such as film flicker.
Seeing also Fig. 1, is a kind of synoptic diagram of prior art liquid crystal display drive circuit.This liquid crystal display drive circuit 10 comprises that many sweep traces that are parallel to each other 110, many are parallel to each other and the data line 120 that intersects vertically with these sweep trace 110 insulation respectively, a plurality of thin film transistor (TFT) 130, a plurality of pixel electrode 140, scan driving circuit 11 and data drive circuit 12 that is positioned at this sweep trace 110 and these data line 120 infalls.This scan drive circuit 11 is used to drive this sweep trace 110.This data drive circuit 12 is used to drive this data line 120.Wherein, this sweep trace 110 is defined as a pixel cell (indicating) with the Minimum Area that this data line 120 is enclosed.
Please consulting Fig. 2 again, is the equivalent circuit diagram of these liquid crystal display panel drive circuit 10 1 pixel cells.The grid 131 of this thin film transistor (TFT) 130 is connected to this sweep trace 110, and source electrode 132 is connected to this data line 120, and drain electrode 133 is connected to this pixel electrode 140.Because this sweep trace 110 itself has certain resistance R, and can produce a stray capacitance Cgd between the grid 131 of this thin film transistor (TFT) 130 and the drain electrode 133, make this resistance R and this stray capacitance Cgd constitute a RC delay circuit.This RC delay circuit makes the sweep signal that is applied on this sweep trace 110 produce distortion, and degreeof tortuosity is determined by this sweep trace 110 resistance R and stray capacitance Cgd own.
Please consulting Fig. 3 again, is the sweep signal oscillogram of these liquid crystal display panel drive circuit 10 one scan lines 110.Wherein, " V
Gh" represent the high voltage of the sweep signal of this sweep trace 110, " V
G1" represent the low-voltage of the sweep signal of this sweep trace 110; " V
G2" represent the sweep signal oscillogram that this sweep trace 110 is desirable, " V
G3" expression is away from the sweep signal oscillogram of the sweep trace 110 of this scan drive circuit 110.As can be seen from the figure, export the high voltage " V of these sweep signals when this sweep trace 110
Gh" when opening the grid 131 away from the thin film transistor (TFT) 130 at these scan drive circuit 110 places, as can be seen from the figure, V
G3Produce distortion, this scanning signal delay, these 131 unlatching periods of grid shorten, as the low-voltage " V of these sweep trace 110 these sweep signals of output
G1" when closing this grid 131, the delay of this sweep signal can not be closed this grid 131 immediately.
Because the time of these data drive circuit 12 output source signal is consistent with the desirable opening time of this grid 131, produce when postponing away from 131 opening times of grid of scan drive circuit 11, this data drive circuit 12 can correspondingly not postpone to export source signal, the time that causes source signal to write the source electrode 132 of this thin film transistor (TFT) 130 shortens, then these pixel electrode 140 undercharges cause the film flicker phenomenon; When 131 shut-in times of grid away from scan drive circuit 11 produce delay, this thin film transistor (TFT) 130 is still opened, when 12 pairs of these adjacent next line sweep traces of this data drive circuit 110 are imported opposite source signal, this opposite source signal will write this thin film transistor (TFT) of not closing 130, cause that the gray scale voltage that this thin film transistor (TFT) 130 has write descends, leaky promptly occurs, make LCD produce film flicker.
Summary of the invention
In order to solve the film flicker problem of above-mentioned LCD, provide a kind of LCD of film flicker problem of improving in fact for essential.
In order to solve the film flicker problem of above-mentioned LCD, provide a kind of driving circuit of above-mentioned LCD real for essential.
In order to solve the film flicker problem of above-mentioned LCD, provide a kind of driving method of above-mentioned LCD real for essential.
A kind of LCD, it comprises a display panels, this display panels comprises multi-strip scanning line (G
1~G
2n, n is a natural number), be used to provide the scan drive circuit of a plurality of sweep signals to this multi-strip scanning line, to be used for when this sweep trace is scanned, these many data lines being provided the data drive circuit and a delay compensating circuit of gray scale voltage with vertically insulated crossing many data lines of this sweep trace, a plurality of thin film transistor (TFT)s, of being positioned at this sweep trace and this data line infall; This delay compensating circuit is at one scan line G
i(2≤i≤2n, i are natural number) is scanned to open and this sweep trace G
iDuring a plurality of thin film transistor (TFT) that links to each other, input is opened compensating signal to this sweep trace G
iAway from an end of this scan drive circuit, quicken to open and this sweep trace G
iThese a plurality of thin film transistor (TFT)s that link to each other; Input is simultaneously closed compensating signal to this sweep trace G
I-1Away from an end of this scan drive circuit, quicken to close and this sweep trace G
I-1The a plurality of thin film transistor (TFT)s that link to each other.
A kind of liquid crystal display drive circuit, it comprises that many parallel scanning beams, many are parallel and be used to provide the scan drive circuit of a plurality of sweep signals to this multi-strip scanning line, to be used for providing for these many data lines the data drive circuit and a delay compensating circuit of gray scale voltage when this sweep trace is scanned with the vertically insulated crossing data line of this sweep trace, a plurality of thin film transistor (TFT), that is positioned at this sweep trace and this data line infall; This delay compensating circuit is at one scan line G
i(2≤i≤2n, i are natural number) is scanned to open and this sweep trace G
iDuring a plurality of thin film transistor (TFT) that links to each other, input is opened compensating signal to this sweep trace G
iAway from an end of this scan drive circuit, quicken to open and this sweep trace G
iThese a plurality of thin film transistor (TFT)s that link to each other; Input is simultaneously closed compensating signal to this sweep trace G
I-1Away from an end of this scan drive circuit, quicken to close and this sweep trace G
I-1The a plurality of thin film transistor (TFT)s that link to each other.
A kind of driving method of LCD, this LCD comprise scan driving circuit, a display panels and a delay compensating circuit, and this display panels comprises multi-strip scanning line (G
1~G
2n, n is a natural number), this driving method comprises: open sweep signal one scan line G when this scan drive circuit applies one
i(2≤i≤2n, i are natural number), this delay compensating circuit apply one and open compensating signal to this sweep trace G
iThe other end; Simultaneously, this scan drive circuit applies one and closes sweep signal one scan line G
I-1(2≤i≤2n, i are natural number), this delay compensating circuit apply one and close compensating signal to this sweep trace G
I-1The other end.
Compared to prior art, the display panels of LCD of the present invention comprises a delay compensating circuit, and this delay compensating circuit produces two compensating signals respectively to this sweep trace G
I-1Sweep signal and this sweep trace G
iSweep signal compensate, to quicken these a plurality of thin film transistor (TFT)s of these sweep signal opening and closing, prevent that leaky from producing, thereby effectively overcome the film flicker of this LCD.
Compared to prior art, liquid crystal display drive circuit of the present invention comprises a delay compensating circuit, and this delay compensating circuit produces two compensating signals respectively to this sweep trace G
I-1Sweep signal and this sweep trace G
iSweep signal compensate, to quicken these a plurality of thin film transistor (TFT)s of these sweep signal opening and closing, prevent that leaky from producing, thereby effectively overcome the film flicker of this LCD.
Compared to prior art, the driving method of LCD of the present invention produces two compensating signals respectively to sweep signal and this sweep trace G of this sweep trace Gi-1 by a delay compensating circuit
iSweep signal compensate, to quicken these a plurality of thin film transistor (TFT)s of these sweep signal opening and closing, prevent that leaky from producing, thereby effectively overcome the film flicker of this LCD.
Description of drawings
Fig. 1 is a kind of synoptic diagram of prior art liquid crystal display panel drive circuit.
Fig. 2 is the equivalent circuit diagram of this liquid crystal display panel drive circuit one pixel cell.
Fig. 3 is the sweep signal oscillogram of this liquid crystal display panel drive circuit one scan line.
Fig. 4 is the electrical block diagram of LCD of the present invention.
Fig. 5 is the sweep signal oscillogram of LCD shown in Figure 4.
Embodiment
Seeing also Fig. 4, is the electrical block diagram of LCD of the present invention.This LCD 400 comprises scan driving circuit 410, a data drive circuit 420, a display panels 430 and a delay compensating circuit 440.This scan drive circuit 410 is used to scan this display panels 430, this data drive circuit 420 is used for providing gray scale voltage to this display panels 430 when this display panels 430 is scanned, and the sweep signal that this delay compensating circuit 440 is used to afford redress is to this display panels 430.
This display panels 430 comprises many sweep trace that is parallel to each other 401 (G
1To G
2n2n bar altogether, n is a natural number), many be parallel to each other and with the vertically insulated crossing data lines 402 of this sweep trace 401, a plurality of thin film transistor (TFT) 403, a plurality of pixel electrode 404 and public electrode 405 a plurality of and that these a plurality of pixel electrodes 404 are oppositely arranged that is positioned at this sweep trace 401 and these data line 402 infalls.This each thin film transistor (TFT) 403 includes a grid (not indicating), an one source pole (not indicating) and a drain electrode (not indicating), and the grid of this each thin film transistor (TFT) 403 is connected to this sweep trace 401, and source electrode is connected to this data line 402, and drain electrode is connected to this pixel electrode 404.
This delay compensating circuit 440 comprises a plurality of switch elements 450, one first signal input part 460 and a secondary signal input end 470.The compensating signal of this first signal input part 460 and 470 inputs of secondary signal input end is an ac voltage signal, and its amplitude is consistent with this sweep signal.These a plurality of switch elements 450 are a plurality of thin film transistor (TFT) (T
1To T
2n2n altogether, n is a natural number), each switch element 450 comprises a grid 451, one source pole 452 and a drain electrode 453.This switch element T
I-1(this grid 451 of 2≤i≤2n) and this source electrode 452 all with this sweep trace G
I-1(2≤i≤2n) end away from this scan drive circuit 410 connects, and this switch element T
I-1Drain electrode 453 link to each other with this first signal input part 460; This switch element T
iThis grid 451 and this source electrode 452 all with this sweep trace G
iEnd away from this scan drive circuit 410 connects, and this switch element T
I-1Drain electrode 453 link to each other with this secondary signal input end 470.These two signal input parts 460 and 470 pass through these a plurality of switch elements 450 with compensating signal difference input scan line G
I-1With sweep trace G
iEnd away from this scan drive circuit 410.
Seeing also Fig. 5, is the sweep signal oscillogram of LCD shown in Figure 4." V wherein
Gh" represent the high voltage of the sweep signal of this sweep trace 401, " V
G1" represent the low-voltage of the sweep signal of this sweep trace 401; " V
Gh0" represent the high voltage of this compensating signal, " V
G1 0" represent the low-voltage of this compensating signal; V
Gi-1And V
GiBe respectively sweep trace G
I-1With sweep trace G
iThe sweep signal oscillogram; V
1And V
2It is respectively the compensating signal oscillogram of this first signal input part 460 and secondary signal input end 470.
Referring again to Fig. 4 and Fig. 5, the principle of work of this delay compensating circuit is as described below:
During the t0 to t1, this scan drive circuit 410 is lined by line scan, when it scans this sweep trace G
I-1The time, promptly import this sweep signal " V
Gh", this first signal input part 460 receives and this sweep signal " V simultaneously simultaneously
Gh" consistent compensating signal " V
Gh0"; This sweep signal " V
Gh" at this sweep trace G
I-1Last transmission is to open this sweep trace G
I-1The a plurality of thin film transistor (TFT)s 403 that connected, when with this sweep trace G
I-1Sense this sweep signal " V away from the switch element 450 that these scan drive circuit 410 1 ends are connected
Gh" time, its unlatching is so that the compensating signal " V on this first signal input part 460
Gh0" import this sweep trace G
I-1, quicken and this sweep trace G
I-1The a plurality of thin film transistor (TFT)s 403 that link to each other are opened.At this moment, this sweep trace G
iThe sweep signal of last input is " V
G1", with this sweep trace G
iA plurality of thin film transistor (TFT)s 403 and switch element T
iAll close the compensating signal " V of this secondary signal input end 470
G1 0" can't import this sweep trace G
i
During the t1 to t2, this scan drive circuit 410 this sweep trace of scanning G
i, promptly import this sweep signal " V
Gh", this secondary signal input end 470 switches this compensating signal " V simultaneously
G1 0" be and this sweep signal " V
Gh" consistent compensating signal " V
Gh0"; This sweep signal " V
Gh" at this sweep trace G
iLast transmission is to open this sweep trace G
iThe a plurality of thin film transistor (TFT)s 403 that connected, when with this sweep trace G
iThe switch element T that is connected away from these scan drive circuit 410 1 ends
iSense this sweep signal " V
Gh" time, its unlatching is so that the compensating signal " V on this secondary signal input end 470
Gh0" import this sweep trace G
i, quicken and this sweep trace G
iThe a plurality of thin film transistor (TFT)s 403 that link to each other are opened.At this moment, to input to the signal of this sweep trace Gi-1 be this sweep signal " V to this scan drive circuit 410
G1", to close and this sweep trace G
I-1The a plurality of thin film transistor (TFT)s 403 that link to each other, this first signal input part 460 switches to compensating signal " V simultaneously with this scan drive circuit 410
G10", this scan drive circuit 410 this sweep signal of input " V
G1" to this sweep trace G
I-1To close this sweep trace G
I-1On thin film transistor (TFT) 403.Cause is at this sweep trace G
I-1On, this sweep signal " V
G1" signal delay can take place, this is connected in this sweep trace G
I-1Switch element T away from these scan drive circuit 410 1 ends
I-1Can not close fully, so the compensating signal " V on will this first signal input part 460
G1 0" input to this sweep trace G
I-1, to quicken this sweep trace G
I-1On thin film transistor (TFT) 403 and this switch element T
I-1Close, afterwards this sweep trace G
I-1Keep this sweep signal " V
G1", this switch element T
I-1Close, the compensating signal on this first signal input part 460 is to this sweep trace G
I-1There is not influence.
In sum, the course of work of this LCD 400 is consistent with said process.This scan drive circuit 410 opens and closes the sweep signal of these a plurality of thin film transistor (TFT)s 403 line by line to these sweep trace 401 inputs, this delay compensating circuit 440 quickens to open and the compensating signal that quickens to close these a plurality of thin film transistor (TFT)s 403 to these sweep trace 401 inputs line by line.That is, this delay compensating circuit 440 interlocks by a plurality of switch elements 450 and is connected with secondary signal input end 470 with this first signal input part 460, as this sweep trace G
I-1Scanning when charging, the compensating signal of first signal input part 460 is imported this sweep trace G
I-1Compensate, to quicken and this sweep trace G
I-1The a plurality of thin film transistor (TFT)s 403 that link to each other are opened; When with this sweep trace G
I-1Next adjacent sweep trace G
iDuring charging, this secondary signal input end 470 this sweep trace of compensation G
iWith quick unlatching and this sweep trace G
iThe a plurality of thin film transistor (TFT)s 403 that link to each other, these first signal input part, 460 switching compensating signals are imported this sweep trace G simultaneously
I-1To quicken and this sweep trace G
I-1The a plurality of thin film transistor (TFT)s 403 and this switch element T that link to each other
I-1Close.
Compared to prior art, LCD 400 of the present invention is provided with a delay compensating circuit 440, this delay compensating circuit 440 comprises a plurality of switch elements 450 and two compensating signal input ends 460 and 470, and these switch element 450 these sweep signals of induction are controlled 440 pairs of these sweep traces of this delay compensating circuit G
I-1With this sweep trace G
iDifference input offset signal, compensating the signal delay that this sweep signal produces when opening this a plurality of thin film transistor (TFT) 403 and when closing this a plurality of thin film transistor (TFT) 403, to prevent that source signal time that writes when this data line 402 grid occurs and opens is short and to leak electricity caused film flicker when closing.Because this sweep trace G
I-1With this sweep trace G
iCarry out signal compensation respectively, can guarantee this scan drive circuit 410 when lining by line scan, the compensating signal of adjacent scanning lines 401 can not influence each other.
Claims (4)
1. LCD, it comprises a display panels, this display panels comprises multi-strip scanning line G
1~G
2nN is for natural number, be used to provide the scan drive circuit and of a plurality of sweep signals to this multi-strip scanning line to be used for when this sweep trace is scanned these many data lines being provided the data drive circuit of gray scale voltage with vertically insulated crossing many data lines of this sweep trace, a plurality of thin film transistor (TFT)s, of being positioned at this sweep trace and this data line infall, it is characterized in that: this LCD further comprises a delay compensating circuit, and this delay compensating circuit comprises a plurality of switch element T
1~T
2n, n is natural number, the first compensating signal input end and the second compensating signal input end, this switch element T
I-1An end connect this sweep trace G
I-1, the other end connects this first compensating signal input end, and 2≤i≤2n, i are even number; This switch element T
iAn end connect this sweep trace G
i, the other end links to each other with this second compensating signal input end; This sweep trace G
iWhen being scanned charging, this second compensating signal input end is used for input and opens compensating signal to this sweep trace G
iAway from an end of this scan drive circuit, to quicken a plurality of thin film transistor (TFT)s and open, this first compensating signal input end input is simultaneously closed compensating signal to this sweep trace G
I-1Away from an end of this scan drive circuit, quicken and this sweep trace G
I-1The a plurality of thin film transistor (TFT)s that connect cut out, these a plurality of switch elements are a plurality of thin film transistor (TFT)s, this thin film transistor (TFT) comprises a grid, one source pole and a drain electrode, this grid all is connected with this multi-strip scanning line end with this source electrode, and the drain electrode of two thin film transistor (TFT)s that this is adjacent is connected with two compensating signal input ends respectively.
2. LCD as claimed in claim 1 is characterized in that: these two compensating signals are ac voltage signal, and all the sweep signal with this scan drive circuit is consistent with the cycle for its amplitude.
3. liquid crystal display drive circuit, it comprises that many parallel scanning beams, many are parallel and be used to provide the scan drive circuit of a plurality of sweep signals to this multi-strip scanning line, to be used for providing for these many data lines the data drive circuit of gray scale voltage when this sweep trace is scanned with the vertically insulated crossing data line of this sweep trace, a plurality of thin film transistor (TFT), that is positioned at this sweep trace and this data line infall, it is characterized in that: this liquid crystal display drive circuit further comprises a delay compensating circuit, and this delay compensating circuit comprises a plurality of switch element T
1~T
2n, n is natural number, the first compensating signal input end and the second compensating signal input end, this switch element T
I-1An end connect this sweep trace G
I-1, the other end connects this first compensating signal input end, and 2≤i≤2n, i are even number; This switch element T
iAn end connect this sweep trace G
i, the other end links to each other with this second compensating signal input end; This sweep trace G
iWhen being scanned charging, this second compensating signal input end input is opened compensating signal to this sweep trace G
iAway from an end of this scan drive circuit, quicken and this sweep trace G
iThe a plurality of thin film transistor (TFT)s that connect are opened, and this first compensating signal input end input is simultaneously closed compensating signal to this sweep trace G
I-1Away from an end of this scan drive circuit, quicken and this sweep trace G
I-1The a plurality of thin film transistor (TFT)s that connect cut out, these a plurality of switch elements are a plurality of thin film transistor (TFT)s, this thin film transistor (TFT) comprises a grid, one source pole and a drain electrode, this grid all is connected with this multi-strip scanning line end with this source electrode, and the drain electrode of two thin film transistor (TFT)s that this is adjacent is connected with two compensating signal input ends respectively.
4. liquid crystal display drive circuit as claimed in claim 3 is characterized in that: these two compensating signals are ac voltage signal, and its amplitude is all consistent with this sweep signal with the cycle.
Priority Applications (1)
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CN200610157304A CN100582880C (en) | 2006-12-01 | 2006-12-01 | LCD device and its drive circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200610157304A CN100582880C (en) | 2006-12-01 | 2006-12-01 | LCD device and its drive circuit |
Publications (2)
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CN101191920A CN101191920A (en) | 2008-06-04 |
CN100582880C true CN100582880C (en) | 2010-01-20 |
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CN200610157304A Expired - Fee Related CN100582880C (en) | 2006-12-01 | 2006-12-01 | LCD device and its drive circuit |
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Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101847377B (en) | 2009-03-27 | 2012-05-30 | 北京京东方光电科技有限公司 | Gate drive device of liquid crystal display |
TWI409789B (en) * | 2009-11-20 | 2013-09-21 | Univ Nat Chiao Tung | Liquid crystal panel and scan line compensation circuit thereof |
CN102881254B (en) * | 2012-09-28 | 2015-07-15 | 昆山工研院新型平板显示技术中心有限公司 | Driving system and driving method for improving picture quality |
CN104282269B (en) * | 2014-10-17 | 2016-11-09 | 京东方科技集团股份有限公司 | A kind of display circuit and driving method thereof and display device |
CN104282270B (en) | 2014-10-17 | 2017-01-18 | 京东方科技集团股份有限公司 | Gate drive circuit, displaying circuit, drive method and displaying device |
CN104952409B (en) * | 2015-07-07 | 2018-12-28 | 京东方科技集团股份有限公司 | Drive element of the grid and its driving method, gate driving circuit and display device |
CN105047154B (en) * | 2015-08-11 | 2017-10-17 | 武汉华星光电技术有限公司 | Drive compensation circuit, liquid crystal display device and driving method with the circuit |
CN105374330B (en) * | 2015-12-01 | 2018-01-26 | 深圳市华星光电技术有限公司 | Display device and its driving method |
CN105717721B (en) * | 2016-04-13 | 2018-11-06 | 深圳市华星光电技术有限公司 | array substrate and liquid crystal display panel |
CN106128402B (en) * | 2016-08-31 | 2019-09-17 | 京东方科技集团股份有限公司 | A kind of display base plate driving method, display panel and display device |
CN107505792B (en) * | 2017-09-26 | 2020-12-25 | 深圳市华星光电半导体显示技术有限公司 | Array substrate, display panel and display device |
US10580509B2 (en) | 2017-09-26 | 2020-03-03 | Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd | Array substrate, display panel and display device |
CN112562601A (en) * | 2020-12-21 | 2021-03-26 | 上海树泉信息技术有限公司 | Optimal backlight time calculation method and application |
CN114613332B (en) * | 2022-03-01 | 2023-05-12 | 武汉天马微电子有限公司 | Display panel, driving method thereof and display device |
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