CN102820015A - Method for establishing overdrive table - Google Patents
Method for establishing overdrive table Download PDFInfo
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- CN102820015A CN102820015A CN2012103225173A CN201210322517A CN102820015A CN 102820015 A CN102820015 A CN 102820015A CN 2012103225173 A CN2012103225173 A CN 2012103225173A CN 201210322517 A CN201210322517 A CN 201210322517A CN 102820015 A CN102820015 A CN 102820015A
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- liquid crystal
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- potential value
- gray scale
- overdrive
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Abstract
The invention discloses a method for establishing an overdrive table. The method comprises the following steps of: performing dynamic response test of a liquid crystal screen to be tested to obtain a liquid crystal response curve without overdrive voltage at any gray scale; performing dynamic corresponding test of the liquid crystal screen to be tested to obtain a liquid crystal response curve without overdrive voltage at another gray scale; if a position point on the liquid crystal response curve reaches the target potential value of the previous liquid crystal response curve at the end of one-frame time, recording the target potential value of the liquid crystal response curve as an overdrive voltage value of the previous liquid crystal response curve; obtaining a linear coefficient by use of a first calculation formula according to the obtained overdrive voltage value and the target potential value and start potential value; and obtaining an overdrive table of all gray scales according to a second calculation formula and a calibration table of gray scale and voltage. The method disclosed by the invention can calculate the overdrive voltage between any two levels of gray scale by use of a linear relation formula to establish an overdrive voltage lookup table.
Description
Technical field
The present invention relates to the overdrive technique field, relate in particular to the method that a kind of foundation is overdrived and shown.
Background technology
Because the odjective cause that causes the decline of LCD moving image quality at present is because of LCD " maintenance " type display mode and the slower response speed of liquid crystal pixel.So reduce one of mainly improving one's methods of correction of motion artefacts at present is exactly to utilize the response speed of the type of drive of overdrive (OD) with the raising liquid crystal molecule, thereby effectively reduces the response time of LCD, improves the dynamic image quality.
Because liquid crystal molecule slewing rate and windup-degree are decided by the size that applies voltage.Each liquid crystal molecule all has two electric capacity, and one is that changeless storage capacitance and one reverse with liquid crystal and the liquid crystal capacitance that changes, and each scanning all is a process to the liquid crystal capacitor charge and discharge.According to C=Q/V on the liquid crystal molecule electric capacity, Q remains unchanged when electric weight, because the rising of liquid crystal capacitance can cause corresponding voltage V to descend.Therefore the gray scale response curve of liquid crystal is difficult in the frame and reaches desired value, and uses overdrive technique, increases driving voltage, and electric weight Q is increased than original, and the response time shortens like this.
Therefore, the target of overdriving is exactly:, guarantee in a frame time that brightness output reaches the stationary value of target gray scale to saltus step between any GTG.Yet in practical application, the corresponding best OD value of all GTG brightness of measurements and calculations at first in advance of overdriving, because inappropriate OD value (such as, excessive) will make the generation of moving target edge bright, secretly bilateral, the edge artifacts in promptly overdriving; Too small OD then makes the response time of LC short inadequately; Still cause motion image blurring; Simultaneously the GTG value that appeared of best overdrive voltage value and former frame and target gray scale frame the GTG value that will appear directly related; Have relation one to one, therefore need set up an overdrive voltage look-up table LUT (look up table) accurately.
Summary of the invention
To the problems referred to above, the method that the object of the present invention is to provide a kind of foundation to overdrive and show is set up the overdrive voltage look-up table rapidly with this, reduces workload and raises the efficiency.
For achieving the above object, the method that a kind of foundation according to the invention is overdrived and shown may further comprise the steps:
Liquid crystal display to be measured is carried out the dynamic response test obtain the liquid crystal response curve that does not add overdrive voltage under arbitrary GTG, this liquid crystal response curve is at a frame time end miss the mark potential value;
Liquid crystal display to be measured is carried out the dynamic corresponding test obtain the liquid crystal response curve that does not add overdrive voltage under another GTG; Have a location point to reach the target potential value of a liquid crystal response curve in a frame time end on this liquid crystal response curve, the target potential value that then writes down this liquid crystal response curve is the overdrive voltage value of a last liquid crystal response curve;
The linear relationship that constitutes according to the overdrive voltage value that obtains and target potential value, take-off potential value obtains linear coefficient;
The linear relationship that constitutes according to the linear coefficient that obtains, and the calibration table of gray scale and voltage obtain the table of overdriving of all gray scales.
Preferably, the above-mentioned needed computing formula of linear coefficient that draws does
Wherein, α
1Be linear coefficient; V
ODBe driving voltage value, V
CFBe target potential value and V
PFBe the take-off potential value.
Preferably, the above-mentioned computing formula that obtains all gray scale overdrive voltage values is V
OD=α
2* (V
CF-V
PF)+V
PF, wherein, α
2For confirming the linear coefficient value; V
ODBe driving voltage value, V
CFBe target potential value and V
PFBe the take-off potential value.
Preferably, the different resulting linear coefficients of liquid crystal display is different.
Preferably, liquid crystal display rise with the decline response process in the linear coefficient that obtains different.
Preferably, the information that comprises of said calibration table has gray-scale value, target potential value, take-off potential value.
Preferably, when target gray scale during greater than the threshold value gray scale, then overdrive voltage is that gray scale is 255 voltage.
Preferably, liquid crystal display rise and the decline response process in the linear computing formula that obtains the target gray scale less than threshold value gray scale situation under effectively.
Preferably, liquid crystal display decline response speed is higher than rising response speed.
Preferably, response speed is fast more, and linear coefficient trends towards 1 more.
Beneficial effect of the present invention is:
The present invention utilizes the linear relationship formula, only need measure the liquid crystal response curve, can calculate overdrive voltage between any two-stage gray scale, sets up the overdrive voltage look-up table rapidly, reduces workload and raises the efficiency.Improve the response speed of liquid crystal molecule with this, thereby effectively reduce the response time of LCD, improve the dynamic image quality.
Description of drawings
Fig. 1 is the voltage linear graph of a relation of the said liquid crystal display of the embodiment of the invention under the response of rising;
Fig. 2 is the voltage linear graph of a relation of the said liquid crystal display of the embodiment of the invention under the response that descends.
Embodiment
Below in conjunction with Figure of description the present invention is done further description.
The target of overdriving is to the saltus step of liquid crystal display between any GTG, guarantees that in a frame time brightness output reaches the stationary value of target gray scale.Yet in practical application, the corresponding best OD value of all GTG brightness of measurements and calculations at first in advance of overdriving, because inappropriate OD value (such as, excessive) will make the generation of moving target edge bright, secretly bilateral, the edge artifacts in promptly overdriving; Too small OD then makes the response time of LC short inadequately; Still cause motion image blurring; Simultaneously the GTG value that appeared of best overdrive voltage value and former frame and target gray scale frame the GTG value that will appear directly related; Have relation one to one, therefore need set up an overdrive voltage look-up table LUT (look up table) accurately.
How following simplicity of explanation obtains linear relationship once:
Through observation to liquid crystal response curve under the different GTGs that measure, can find that between the voltage of any two-stage gray scale, the ratio that the height that first frame rises accounts for the height of last rising is certain, promptly the ascending ability of first frame is certain.
At first, for general response liquid crystal faster, following formula is arranged:
T representes transmissivity, T
0And T
1Initial value and the desired value of representing transmissivity respectively.
Obtain according to Fig. 2 correspondence, in the moment of a frame:
So have:
Wherein τ representes the liquid crystal response time, the relative value of τ ' expression response time and frame period Tf.Response time is enough little, coefficient
Be tending towards constant, i.e. L
CF-L
PFAnd L
OD-L
PFLinear.Because the linear relationship of voltage signal and luminance signal proves V thus theoretically
CF-V
PFAnd V
OD-V
PFThe establishment of linear relationship.Same find that through actual measurement this linear relationship still sets up for the slower screen of response.
Therefore, provide computing formula:
V
OD-V
PF＝α*(V
CF-V
PF) (4)
According to explaining of above-mentioned linear relationship, the overdrive voltage value when obtaining each gray scale fast, the overdrive method of table of the said a kind of foundation of the embodiment of the invention may further comprise the steps:
Liquid crystal display to be measured is carried out the dynamic response test obtain the liquid crystal response curve that does not add overdrive voltage under arbitrary GTG, this liquid crystal response curve is at a frame time end miss the mark potential value;
Liquid crystal display to be measured is carried out the dynamic corresponding test obtain the liquid crystal response curve that does not add overdrive voltage under another GTG; Have a location point to reach the target potential value of a liquid crystal response curve in a frame time end on this liquid crystal response curve, the target potential value that then writes down this liquid crystal response curve is the overdrive voltage value of a last liquid crystal response curve;
The linear relation that constitutes according to the overdrive voltage value that obtains and target potential value, take-off potential value obtains linear coefficient;
Constituting with the overdrive voltage value according to the linear coefficient that obtains is the linear relation of unknown number, and the calibration table of gray scale and voltage, obtains the table of overdriving of all gray scales.
Being converted to first computing formula according to above-mentioned linear relationship formula of deriving does
Wherein, α
1Be linear coefficient; V
ODBe driving voltage value, V
CFBe target potential value and V
PFBe the take-off potential value.After adding overdrive voltage, reach preset better effects through arbitrary liquid crystal response curve, change the various numerical value that obtain, calculate the linear coefficient α of above-mentioned formula according to effect
1Fig. 1 is the voltage linear graph of a relation of the said liquid crystal display of the embodiment of the invention under the response of rising; Fig. 2 is the voltage linear graph of a relation of the said liquid crystal display of the embodiment of the invention under the response that descends.
Then with the α that obtains
1Numerical value be written to again in the middle of the above-mentioned linear computing formula, being converted to second computing formula is V
OD=α
2* (V
CF-V
PF)+V
PF, wherein, α
2=α
1, for confirming the linear coefficient value; V
ODBe driving voltage value, V
CFBe target potential value and V
PFBe the take-off potential value.Then, obtain the overdrive voltage table of all gray scales according to the calibration table of gray scale and voltage.Wherein, the information that comprises of said calibration table has gray-scale value, target potential value, take-off potential value.And in the linear computing formula, needed is target potential value and take-off potential value, calculates the overdrive voltage value then.
With specific embodiment the present invention is elaborated below:
Table one: former liquid crystal display GTG look-up table
Table two: the liquid crystal display GTG look-up table after the change
Wherein, linear coefficient α is 1.12.
Embodiment 1:
Find out that from table one the target potential value during liquid crystal display 0-63 GTG is 1800mv, the take-off potential value is 0mv, according to linear computing formula (V
OD-V
PF)=1.12* (V
CF-V
PF), can obtain: (V
OD-0)=1.12* (1800-0), then overdrive voltage value V
OD=2016, match with magnitude of voltage in the table two.
Embodiment 2:
Find out that from table one the target potential value during liquid crystal display 0-255 GTG is 2600mv, the take-off potential value is 0mv, according to linear computing formula (V
OD-V
PF)=1.12* (V
CF-V
PF), can obtain: (V
OD-0)=1.12* (2600-0), then overdrive voltage value V
OD=2912, match with magnitude of voltage in the table two.
Embodiment 3:
Find out that from table one the target potential value during liquid crystal display 63-127 GTG is 1900mv, the take-off potential value is 1800mv and 2016mv, according to linear computing formula (V
OD-V
PF)=1.12* (V
CF-V
PF), can obtain: (V
OD-2016)=1.12* (1900-1800), then overdrive voltage value V
OD=2128, match with magnitude of voltage in the table two.
Embodiment 4:
Find out that from table one the target potential value during liquid crystal display 63-255 GTG is 2500mv, the take-off potential value is 1800mv and 2016mv, according to linear computing formula (V
OD-V
PF)=1.12* (V
CF-V
PF), can obtain: (V
OD-2016)=1.12* (2500-1800), then overdrive voltage value V
OD=2800, match with magnitude of voltage in the table two.
Embodiment 5:
Find out that from table one the target potential value during liquid crystal display 127-191 GTG is 2800mv, the take-off potential value is 2200mv and 2464mv, according to linear computing formula (V
OD-V
PF)=1.12* (V
CF-V
PF), can obtain: (V
OD-2464)=1.12* (2800-2200), then overdrive voltage value V
OD=3136, match with magnitude of voltage in the table two.
Embodiment 6:
Find out that from table one the target potential value during liquid crystal display 127-255 GTG is 2100mv, the take-off potential value is 2200mv and 2464mv, according to linear computing formula (V
OD-V
PF)=1.12* (V
CF-V
PF), can obtain: (V
OD-2464)=1.12* (2100-2200), then overdrive voltage value V
OD=2352, match with magnitude of voltage in the table two.
Embodiment 7:
Find out that from table one the target potential value during liquid crystal display 191-255 GTG is 2400mv, the take-off potential value is 2400mv and 2688mv, according to linear computing formula (V
OD-V
PF)=1.12* (V
CF-V
PF), can obtain: (V
OD-2688)=1.12* (2400-2400), then overdrive voltage value V
OD=2688, match with magnitude of voltage in the table two.
The present invention also need explain some:
1, different screen, alpha is different, a standard that can be used as the quality quality of passing judgment on display screen of this coefficient.α is big more, explains that the overdrive voltage of the voltage needs that reach same is big more, and then the response of screen is slow more; Vice versa.Alpha=1 is not o'clock then for to need overdrive voltage just can reach the fastest perfect condition of response of required voltage.
2, between the identical gray shade scale, from low to high and the coefficient that obtains from high to low also be different, this is because the rising of liquid crystal and different the causing of response that descend.The decline of general screen is all fast than rising, and response speed is than higher, so alpha can more level off to 1 when descending.
To above linear relationship, only need measure a liquid crystal response curve, respectively draw straight line at a frame place of rising edge or negative edge, confirm V according to each position
OD, V
PFAnd V
CFUtilize formula 4, obtain linear coefficient α, utilize the calibration table of gray scale and voltage simultaneously, obtain the overdrive voltage between all gray scales.
Adopt this short-cut method to note also, according to the principle of overdriving, when reaching certain gray scale, it is 255 voltage that driving voltage just is merely gray scale.So will find threshold value gray scale (surpass this gray scale all will use gray scale be the gray-scale value of 255 driven) here when calculating earlier.For example when rising, linear programming the target gray scale less than before the threshold value gray scale effectively, when target gray scale during greater than the threshold value gray scale, the voltage when then overdrive voltage is exactly gray scale G=255.In like manner can be regarded as during decline.Through such process, just can set up the over-driving look-up table of display screen rapidly.
More than; Be merely preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, any technician who is familiar with the present technique field is in the technical scope that the present invention discloses; The variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Claims (10)
1. the method that foundation is overdrived and shown is characterized in that, may further comprise the steps:
Liquid crystal display to be measured is carried out the dynamic response test obtain the liquid crystal response curve that does not add overdrive voltage under arbitrary GTG, this liquid crystal response curve is at a frame time end miss the mark potential value;
Liquid crystal display to be measured is carried out the dynamic corresponding test obtain the liquid crystal response curve that does not add overdrive voltage under another GTG; Have a location point to reach the target potential value of a liquid crystal response curve in a frame time end on this liquid crystal response curve, the target potential value that then writes down this liquid crystal response curve is the overdrive voltage value of a last liquid crystal response curve;
The linear relationship that constitutes according to the overdrive voltage value that obtains and target potential value, take-off potential value obtains linear coefficient;
The linear relationship that constitutes according to the linear coefficient that obtains, and the calibration table of gray scale and voltage obtain the table of overdriving of all gray scales.
2. the method that foundation according to claim 1 is overdrived and shown is characterized in that the above-mentioned needed computing formula of linear coefficient that draws does
Wherein, α
1Be linear coefficient; V
ODBe driving voltage value, V
CFBe target potential value and V
PFBe the take-off potential value.
3. the method that foundation according to claim 1 is overdrived and shown is characterized in that the above-mentioned computing formula that obtains all gray scale overdrive voltage values is V
OD=α
2* (V
CF-V
PF)+V
PF, wherein, α
2For confirming the linear coefficient value; V
ODBe driving voltage value, V
CFBe target potential value and V
PFBe the take-off potential value.
4. the method that foundation according to claim 1 is overdrived and shown is characterized in that, the resulting linear coefficient of different liquid crystal displays is different.
5. the overdrive method of table of foundation according to claim 1 is characterized in that, liquid crystal display rise with the decline response process in the linear coefficient that obtains different.
6. the method that foundation according to claim 1 is overdrived and shown is characterized in that the information that said calibration table comprises has gray-scale value, target potential value, take-off potential value.
7. the overdrive method of table of foundation according to claim 1 is characterized in that, when target gray scale during greater than the threshold value gray scale, then overdrive voltage is that gray scale is 255 voltage.
8. the overdrive method of table of foundation according to claim 1 is characterized in that, liquid crystal display rise and the decline response process in the linear computing formula that obtains the target gray scale less than threshold value gray scale situation under effectively.
9. the method that foundation according to claim 1 is overdrived and shown is characterized in that liquid crystal display decline response speed is higher than rising response speed.
10. the method that foundation according to claim 1 is overdrived and shown is characterized in that response speed is fast more, and linear coefficient trends towards 1 more.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107402465A (en) * | 2017-08-04 | 2017-11-28 | 中国科学院光电技术研究所 | A kind of method for building up of over-driving look-up table |
| CN109215553A (en) * | 2018-09-21 | 2019-01-15 | 重庆惠科金渝光电科技有限公司 | The method for building up and readable storage medium storing program for executing of display panel and its over-driving look-up table |
| CN109671412A (en) * | 2019-02-18 | 2019-04-23 | 京东方科技集团股份有限公司 | Over-driving method, device, the controller of liquid crystal display panel and display equipment |
| CN110379391A (en) * | 2019-07-02 | 2019-10-25 | 南京中电熊猫液晶显示科技有限公司 | A kind of liquid crystal display panel and the method for improving the hangover of liquid crystal display panel dynamic menu |
| US10878779B2 (en) | 2018-09-21 | 2020-12-29 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Display panel, method of establishing overdrive lookup table for the display panel, and readable storage medium |
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| US10878779B2 (en) | 2018-09-21 | 2020-12-29 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Display panel, method of establishing overdrive lookup table for the display panel, and readable storage medium |
| CN109671412A (en) * | 2019-02-18 | 2019-04-23 | 京东方科技集团股份有限公司 | Over-driving method, device, the controller of liquid crystal display panel and display equipment |
| US10991324B2 (en) | 2019-02-18 | 2021-04-27 | Beijing Boe Display Technology Co., Ltd. | Overdrive method and device, controller, display apparatus, and storage medium |
| CN110379391A (en) * | 2019-07-02 | 2019-10-25 | 南京中电熊猫液晶显示科技有限公司 | A kind of liquid crystal display panel and the method for improving the hangover of liquid crystal display panel dynamic menu |
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Application publication date: 20121212 |