CN100410995C - Asymmetrical liquid crystal screen driving method - Google Patents
Asymmetrical liquid crystal screen driving method Download PDFInfo
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- CN100410995C CN100410995C CNB200410002815XA CN200410002815A CN100410995C CN 100410995 C CN100410995 C CN 100410995C CN B200410002815X A CNB200410002815X A CN B200410002815XA CN 200410002815 A CN200410002815 A CN 200410002815A CN 100410995 C CN100410995 C CN 100410995C
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Abstract
The present invention relates to a method for driving an asymmetrical liquid crystal screen, which is used for driving pixels of a liquid crystal screen. The charging time of the pixels is divided into first sub-charging time and second sub-charging time. Firstly, in the first sub-charging time, the pixels are driven by first driving voltage; then, in the second sub-charging time, the pixels are driven by second driving voltage, wherein the first driving voltage is higher than the second driving voltage, and the first sub-charging time is shorter than the second sub-charging time.
Description
Technical field
The present invention relates to a kind of LCD screen driving method, particularly a kind of asymmetric LCD screen driving method.
Background technology
Along with the progress of science and technology and the innovation of technology, the development of imaging technique is maked rapid progress especially, and is at a tremendous pace.With the display is example, traditional cathode-ray tube (CRT) (Cathode Ray Tube, CRT) display is because bulky and radiation is serious, fade out the gradually in recent years market of high-order display, replace, be low radiation, low power consumption and compact LCD (Liquid Crystal Display, LCD), Organic Light Emitting Diode (Organic Light Emitter Diode, OLED) display or plasma display panel (Plasma Display Panel, flat-panel screens such as PDP).
The screen of display is made up of with matrix form bright spot one by one, and these bright spots are called pixel (pixel).Pixel is the most basic unit of screen, according to the pixel data generation driving voltage of input display, the brightness of driving voltage in order to determine that each pixel shows.Display presents frame (frame) according to horizontal-drive signal (Horizontal Synchronal signal) Hs, vertical synchronizing signal (Vertical Synchronalsignal) Vs.Horizontal-drive signal Hs can determine the pixel columns of per second Show Color.When the pairing pixel of pixel data of input was the pixel of last row of screen, first leu of being controlled the wraparound screen by vertical synchronizing signal Vs came video picture according to pixel data.So vertical synchronizing signal Vs can determine each frame to show the length of time, the time interval of adjacent two vertical synchronizing signals is a frame time (frame time).
Because people's eyes have the phenomenon of persistence of vision, so if the renewal speed of display frame arrives certain degree greatly, then the frame of fast updating is not the frame that flashes fast one by one just by the human eye finding.The speed that different frames is changed on indicator screen is called renewal rate (refresh rate), the just frequency of vertical synchronizing signal Vs.The frame update speed of at present general main frame is more than the 60Hz, and promptly indicator screen can show 60 frame data in one second at least, and each frame time is below the 16.7ms.With resolution is that 1024 * 768 LCD screen is an example, and the duration of charging of each pixel is 16.7ms/768=22us.
With liquid crystal screen display, each pixel includes liquid crystal, changes the penetrance T (transparency) of the liquid crystal of this pixel to light according to imposing on the driving voltage on the pixel, so that pixel presents different brightness.Because the liquid crystal reaction time, (response time) was slower, cause driving voltage to reach target drives voltage V
DAfter, the penetrance of liquid crystal still can't reach corresponding this target drives voltage V in real time
DDue target penetration rate T
DPlease refer to Figure 1A, it shows pixel, and (i, driving voltage curve map j), transverse axis are time t.Very fast, (i, driving voltage j) promptly rise to target drives voltage V to put on pixel
DPlease refer to Figure 1B, it shows according to the pixel of the driving voltage of Figure 1A (i, penetrance T curve map j).(i, in the time of j), (i, the penetrance T of liquid crystal j) promptly begin to rise pixel, but need quite long rise time t1 just can rise to target penetration rate T when driving voltage puts on pixel
D
The method of accelerating the reaction velocity of liquid crystal traditionally for example provides one and is higher than target drives voltage V
DOverdrive voltage Vo, reach target penetration rate T to quicken liquid crystal
DThe required rise time.Please refer to Fig. 2 A, it shows and applies overdrive voltage Vo in pixel (i, driving voltage curve map j).Please be simultaneously with reference to Fig. 2 B, it shows, and (i, the penetrance T curve map of liquid crystal j) can reach target penetration rate T at time point t2 according to the pixel of the driving voltage of Fig. 2 A
DBy providing overdrive voltage Vo can accelerate the reaction time of liquid crystal among the figure as can be known.Yet overdrive voltage Vo's is big or small wayward.If overdrive voltage Vo is too high, can make last penetrance T greater than target penetration rate T
DIf overdrive voltage Vo is too low, can make the reaction velocity of liquid crystal fast inadequately again.
And above-mentioned excessive driving method can only be to quicken the upper limit with the renewal rate, more quickens to improve renewal rate if desire.Like this then the duration of charging each pixel will shorten dramatically, and therefore, the size of thin film transistor (TFT) must strengthen, and the gate line of scanning linear also must be widened, to reduce impedance.But therefore aperture opening ratio will reduce.
Summary of the invention
In view of this, purpose of the present invention is exactly that a kind of LCD screen driving method that can dwindle the reaction time of LCD screen is being provided.
According to purpose of the present invention, a kind of asymmetric LCD screen driving method is proposed.This method is in order to drive a pixel of LCD screen.The duration of charging of pixel (charging time) is to be divided into first sub-duration of charging (sub-charging time) and one second sub-duration of charging.At first, drive pixel in the first sub-duration of charging with first driving voltage.Drive pixel in the second sub-duration of charging with second driving voltage then.Wherein, first driving voltage is greater than second driving voltage, and the duration of charging is less than the duration of charging second time for the first time.
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, a preferred embodiment cited below particularly, and conjunction with figs. are described in detail below.
The accompanying drawing summary
Figure 1A shows the driving voltage curve map of pixel.
Figure 1B shows the penetrance curve map according to the pixel of the driving voltage of Figure 1A.
Fig. 2 A shows and applies the driving voltage curve map of overdrive voltage in pixel.
Fig. 2 B shows the penetrance curve map according to the pixel of the driving voltage of Fig. 2 A.
Fig. 3 shows a kind of asymmetric LCD screen driving method process flow diagram according to a preferred embodiment of the present invention.
Fig. 4 shows the driving voltage curve map of pixel.
Fig. 5 A and 5B show the curve map of the penetrance of pixel.
Embodiment
Spirit of the present invention is asymmetricly the duration of charging of a pixel is divided into two parts: the first sub-duration of charging (sub-charging time) and the second sub-duration of charging.Please refer to Fig. 3, it shows a kind of asymmetric LCD screen driving method process flow diagram according to a preferred embodiment of the present invention.With resolution 1024 * 768, renewal rate (refresh rate) is that the pixel of same row is charged simultaneously for the LCD screen of 60Hz is an example at every turn, and therefore the duration of charging tc of a pixel is (1/60)/768=22us.(i j) does explanation for example, and wherein, i is the positive integer smaller or equal to 1024, and j is the positive integer smaller or equal to 768 with a pixel driving LCD screen at this.And please be simultaneously with reference to the driving voltage curve map of Fig. 4.The first sub-duration of charging was to be time tc1, and time tc1 was the second sub-duration of charging to time tc's.At first, in the first sub-duration of charging, with the first driving voltage V
D1The driving pixel (i, j), shown in step 301.Then, in the second sub-duration of charging, with the second driving voltage V
D2The driving pixel (i, j), shown in step 302.
Please refer to Fig. 5 A and 5B, it shows the curve map of penetrance.The ratio of the first sub-duration of charging with the second sub-duration of charging is to be 1: 2 at present embodiment.In Fig. 5 A, the first driving voltage V
D1Be to make the maximum penetration rate of pixel greater than target penetration rate T
DIn Fig. 5 B, the first driving voltage V
D1Be to make the maximum penetration rate of pixel less than target penetration rate T
DThough Fig. 5 A is different with the curve of the penetrance T of Fig. 5 B, this pixel for human eye, its display effect be can be considered as identical.Because the first driving voltage V in the first sub-duration of charging
D1Be that its time is shorter in order to the reaction time of the liquid crystal of decision pixel, it influences not quite concerning human eye, therefore the first driving voltage V
D1As long as can make its corresponding penetrance that 90% accuracy is arranged.And the second sub-duration of charging is longer, its second driving voltage V
D2Therefore can determine the penetrance of the liquid crystal of pixel.Therefore the present invention's reaction time that can under the situation that does not influence display quality, accelerate liquid crystal.
The invention effect
The disclosed asymmetric LCD screen of the above embodiment of the present invention driving method can be accelerated the reaction time of liquid crystal under the situation that does not influence display quality.And not needing the design of liquid crystal panel is changed, for example is the size of change gate line, thin film transistor (TFT), to promote the speed of research and development.
In sum; though the present invention discloses as above with a preferred embodiment; right its is not in order to limit the present invention; anyly have the knack of this skill person; without departing from the spirit and scope of the present invention; when can being used for a variety of modifications and variations, so protection scope of the present invention is as the criterion when looking accompanying the claim person of defining.
Claims (2)
1. asymmetric LCD screen driving method, in order to drive a pixel of this LCD screen, a duration of charging of this pixel is divided into one first sub-duration of charging and one second sub-duration of charging, and this driving method comprises:
Drive this pixel in this first sub-duration of charging with one first driving voltage; Then
Drive this pixel in this second sub-duration of charging with one second driving voltage;
Wherein, this first driving voltage is greater than this second driving voltage, and this first sub-duration of charging is less than this second sub-duration of charging.
2. driving method as claimed in claim 1, wherein, the time ratio in this first sub-duration of charging and this second sub-duration of charging is 1: 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410002815XA CN100410995C (en) | 2004-01-17 | 2004-01-17 | Asymmetrical liquid crystal screen driving method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410002815XA CN100410995C (en) | 2004-01-17 | 2004-01-17 | Asymmetrical liquid crystal screen driving method |
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| CN1641737A CN1641737A (en) | 2005-07-20 |
| CN100410995C true CN100410995C (en) | 2008-08-13 |
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| CNB200410002815XA Expired - Fee Related CN100410995C (en) | 2004-01-17 | 2004-01-17 | Asymmetrical liquid crystal screen driving method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102938243A (en) * | 2012-10-29 | 2013-02-20 | 京东方科技集团股份有限公司 | Liquid crystal display equipment driving method and liquid crystal display equipment |
| CN106847207A (en) * | 2017-01-06 | 2017-06-13 | 京东方科技集团股份有限公司 | A kind of driving method of display panel, display panel and display device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0316822A2 (en) * | 1987-11-13 | 1989-05-24 | Honeywell Inc. | Apparatus and method for providing a gray scale in liquid crystal flat panel displays |
| CN1116454A (en) * | 1993-01-05 | 1996-02-07 | 永丰余香港有限公司 | A data driver circuit for use with an LCD display |
| WO1997025706A1 (en) * | 1996-01-11 | 1997-07-17 | Thomson-Lcd | Method for addressing a flat screen using pixel precharging, driver for carrying out the method, and use thereof in large screens |
| US5940057A (en) * | 1993-04-30 | 1999-08-17 | International Business Machines Corporation | Method and apparatus for eliminating crosstalk in active matrix liquid crystal displays |
| JP2003177720A (en) * | 2001-12-10 | 2003-06-27 | Sony Corp | Liquid crystal driving device and liquid crystal display device |
| CN1427385A (en) * | 2001-08-02 | 2003-07-02 | 精工爱普生株式会社 | Driving of data line used in control of unit circuit |
| US20030214470A1 (en) * | 2002-05-15 | 2003-11-20 | Wein-Town Sun | Pre-charging display apparatus |
-
2004
- 2004-01-17 CN CNB200410002815XA patent/CN100410995C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0316822A2 (en) * | 1987-11-13 | 1989-05-24 | Honeywell Inc. | Apparatus and method for providing a gray scale in liquid crystal flat panel displays |
| CN1116454A (en) * | 1993-01-05 | 1996-02-07 | 永丰余香港有限公司 | A data driver circuit for use with an LCD display |
| US5940057A (en) * | 1993-04-30 | 1999-08-17 | International Business Machines Corporation | Method and apparatus for eliminating crosstalk in active matrix liquid crystal displays |
| WO1997025706A1 (en) * | 1996-01-11 | 1997-07-17 | Thomson-Lcd | Method for addressing a flat screen using pixel precharging, driver for carrying out the method, and use thereof in large screens |
| CN1427385A (en) * | 2001-08-02 | 2003-07-02 | 精工爱普生株式会社 | Driving of data line used in control of unit circuit |
| JP2003177720A (en) * | 2001-12-10 | 2003-06-27 | Sony Corp | Liquid crystal driving device and liquid crystal display device |
| US20030214470A1 (en) * | 2002-05-15 | 2003-11-20 | Wein-Town Sun | Pre-charging display apparatus |
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