CN104252846A - Self-checking driving method of OLED (organic light emitting diode) display - Google Patents
Self-checking driving method of OLED (organic light emitting diode) display Download PDFInfo
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- CN104252846A CN104252846A CN201410537835.0A CN201410537835A CN104252846A CN 104252846 A CN104252846 A CN 104252846A CN 201410537835 A CN201410537835 A CN 201410537835A CN 104252846 A CN104252846 A CN 104252846A
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Abstract
The invention discloses a self-checking driving method of an OLED (organic light emitting diode) display. The method comprises the following steps that the OLED display carries out sampling on an OLED screen every one unit period; the threshold voltage and/or the OLED intermediate voltage are/is measured; the corresponding relationship between each sub pixel of the OLED screen and the threshold voltage and/or the OLED intermediate voltage obtained through measurement is built; the threshold voltage and/or the OLED intermediate voltage, obtained through sampling, of each sub pixel is calculated, and correction and compensation values of each sub pixel are obtained and are stored; the correction and compensation values of each sub pixel and a practically displayed image are subjected to fitting operation, the final driving value of each sub pixel is obtained, and the final driving value of the sub pixel is input for driving the corresponding sub pixel. According to the method, the problems of nonuniform brightness and color attenuation along with the time increase of the OLED display screen can be solved, the color brightness uniformity of the display screen is improved, and the image is more truly restored and displayed.
Description
Technical field
The present invention relates to display technique field, particularly relate to a kind of display drive method of OLED display.
Background technology
In the display field that smart mobile phone, flat panel TV are representative, at present mainly based on LCD.But LCD has, and colour gamut is narrow, the response time is long, poor contrast, many inborn defects such as working temperature interval is little, through industrialized development and the improvement of more than ten years, still cannot fundamentally overcome the above problems.Compared with LCD, the OLED of active illuminating perfectly solves above shortcoming, and has the following technical advantage that more LCD cannot reach:
1. OLED autoluminescence, has higher luminescence efficiency, and single pixel does not work when showing black, and when display is dark, power consumption is lower, more energy-conservation, picture level is outstanding;
2. OLED can make flexible screen, transparent screen.The shape of display be not limited as plane.And it is more durable, more not fragile;
3. the colour gamut of OLED is very wide, can reach 110% NTSC.And common LCD can only reach 70% NTSC.Some cannot the color of accurate reproduction on LCD, and OLED can express;
4. OLED has high-contrast, and contrast can be infinitely great in theory, and can not light leak.And there is no the restriction of visible angle;
5. OLED has the response speed that is exceedingly fast, and the response time only has 1/1000 of LCD;
6. OLED is that solid material is luminous, has better environmental suitability than LCD liquid crystal.Do not have the problem that liquid crystal molecule low temperature viscous increases, serviceability temperature is wider, shock resistance is strong.
But but there are the following problems in current OLED display screen:
1. the parameter u of OLED display different display unit T2 pipe, C, W, L deviation cause drain current deviation, make different display unit when identical voltage supply error of omission electric current and brightness inconsistent;
2. because red, blue, green aging attenuation rate is inconsistent, so can not apply identical Controlling and compensating parameter to the RGB of each pixel.Again because OLED screen is because of reasons such as production technologies, the characteristic of each pixel is also incomplete same, so can not all apply identical Controlling and compensating parameter to the RGB of all pixels of whole screen.Therefore must to each R of whole OLED screen G B sub-pixel carry out measurement one by one and rectification building-out, be head it off, necessarily require OLED screen curtain can the display performance of automatic calibration self in time, regulate the driving voltage of each sub-pixel;
Above-described OLED display also there will be the uneven and color aging problem of pixel display brightness, particularly red and blue display material, along with the increase of service time, catabiosis is very serious, so that occur that OLED screen curtain display brightness declines, display image color cast, has a strong impact on the perception effect of consumer.
Summary of the invention
Accordingly, the invention provides a kind of self checking driving method of OLED display, technical solutions according to the invention are: a kind of self checking driving method of OLED display, described method comprises the steps:
A) OLED display is sampled to OLED screen every a unit period;
B) in sampling period, the medium voltage of threshold voltage and/or OLED is measured;
The corresponding relation of each sub-pixel c) setting up OLED screen and the threshold voltage measured and/or OLED medium voltage;
D) threshold voltage/of each sub-pixel obtained sampling or OLED medium voltage are weighted average and/or average and/or mathematic interpolation, obtain the calibration and compensation value of each pixel, and preserve it;
E) the calibration and compensation value of each sub-pixel and the image of actual displayed are carried out fitting operation, obtain the final motivation value of each sub-pixel, the final motivation value of input sub-pixel drives corresponding sub-pixel.
The self checking driving method of described OLED display, described step e) in fitting operation be:
E1) the Controlling and compensating value of each sub-pixel of OLED display and the planimetric coordinates of each pixel are stored, form Controlling and compensating and refer to matrix;
E2) sub-pixel value of each sub-pixel real image of OLED display is carried out adding computing with corresponding offset, obtain the final motivation value of each sub-pixel.
The self checking driving method of described OLED display, step b) in be carry out independent sample measurement respectively to threshold voltage, OLED medium voltage.
The self checking driving method of described OLED display, after carrying out multiple repairing weld to threshold voltage, getting intermediate value is final measurement; Or carry out multiple repairing weld to OLED medium voltage, getting intermediate value is final testing result.
The self checking driving method of described OLED display, steps d) in each calculate after upgrade the calibration and compensation value of part or all of OLED sub-pixel.
The self checking driving method of described OLED display, the unit period that step a) is sampled can be change; Along with OLED display increases service time, can shorten or extend its sampling period.
The self checking driving method of described OLED display, OLED display sampling can during starting shooting and/or standby period and/or shutdown during carry out.
Adopt the present invention can solve the even color of OLED display screen brightness disproportionation increase in time and occur decay problem, improve the chroma-luminance homogeneity of display screen, reduce more really, show image, significantly can also improve dispatching from the factory yields and actual life of OLED screen curtain, ensure the color consistency of OLED screen curtain in life cycle.
Embodiment
Be described technical scheme of the present invention below in conjunction with embodiments of the invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiment.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain, all belongs to the scope that the present invention protects.
Embodiment one
A self checking driving method for OLED display, described method comprises the steps:
A) OLED display is sampled to OLED screen every a unit period for 1000 hours;
B) in sampling period, complete by 1080 independent samples the medium voltage measuring threshold voltage and/or OLED; After carrying out 1080 samplings to the medium voltage of threshold voltage and/or OLED, getting intermediate value is final measurement;
The corresponding relation of the medium voltage of each sub-pixel c) setting up OLED screen and the threshold voltage measured and/or OLED;
D) formula is pressed to the threshold voltage of each sub-pixel that sampling obtains and/or the initial threshold voltage of pressing of OLED medium voltage: K=|K
0-K
n|/2 carry out mathematic interpolation, obtain the calibration and compensation value of each sub-pixel, and preserve it; Formula illustrates: K this verify the Controlling and compensating value of final sub-pixel; K
0the threshold voltage of original sub-pixel or medium voltage; K
nthe threshold voltage that this sampling obtains or medium voltage;
E) the calibration and compensation value of each sub-pixel and the image of actual displayed are carried out fitting operation, described fitting operation is stored the Controlling and compensating value of each sub-pixel of OLED display and the planimetric coordinates of each pixel, forms Controlling and compensating value matrix; Carried out adding computing with corresponding offset by the sub-pixel value of each sub-pixel real image of OLED display, obtain the final motivation value of each sub-pixel, the final motivation value of input sub-pixel drives corresponding sub-pixel.
Embodiment two
A self checking driving method for OLED display, described method comprises the steps:
A) OLED display is sampled to OLED screen every a unit period for 1000 hours;
B) in sampling period, complete by 1080 independent samples the medium voltage measuring threshold voltage and/or OLED; After carrying out 1080 samplings to the medium voltage of threshold voltage and/or OLED, getting intermediate value is final measurement;
The corresponding relation of each sub-pixel c) setting up OLED screen and the threshold voltage measured and/or OLED medium voltage; The threshold voltage of each sub-pixel that sampling is obtained and/or OLED medium voltage, and time and again sample the before this threshold voltage and/or OLED medium voltage that obtain are by formula K=(K
0+ K
1+ ... + K
n)/(n+1), carry out mean value computation, obtain the calibration and compensation value of each pixel, and the calibration and compensation value of the pixel changed is preserved; Formula illustrates: K this verify the Controlling and compensating value of final sub-pixel; K
0the threshold voltage of original sub-pixel or medium voltage; K
1the threshold voltage of the sub-pixel that first time sampling obtains or medium voltage; K
nthe threshold voltage of the sub-pixel that this sampling obtains or medium voltage;
D) the calibration and compensation value of each sub-pixel and the image of actual displayed are carried out fitting operation, described fitting operation is stored the Controlling and compensating value of each sub-pixel of OLED display and the planimetric coordinates of each pixel, forms Controlling and compensating parameter matrix; Carried out adding computing with corresponding compensating parameter by the sub-pixel value of each sub-pixel real image of OLED display, obtain the final motivation value of each sub-pixel, the final motivation value of input sub-pixel drives corresponding sub-pixel.
Embodiment three
A self checking driving method for OLED display, described method comprises the steps:
A) OLED display work 0-10000 hour period, once sampling was corrected every 1000 hours; Work 10000-50000 hour period, once corrected sampling every 800 hours; Work 50000-100000 hour period, once corrected sampling every 500 hours;
B) in sampling period, complete by 1080 independent samples the medium voltage measuring threshold voltage and/or OLED; After carrying out 1080 samplings to the medium voltage of threshold voltage and/or OLED, getting intermediate value is final measurement;
The corresponding relation of each sub-pixel c) setting up OLED screen and the threshold voltage measured and/or OLED medium voltage;
D) threshold voltage of each sub-pixel sampling obtained and/or OLED medium voltage, and time and again sample the before this threshold voltage and/or OLED medium voltage that obtain are by formula: K=(α
0k
0+ α
1k
1+ ... + α
nk
n)/(n+1) be weighted mean value computation, obtain the calibration and compensation value of each pixel, and the calibration and compensation value of the pixel changed is preserved; Parameters of formula illustrates: K this verify the Controlling and compensating value of final sub-pixel; K
0the Controlling and compensating value of original sub-pixel; K
1the threshold voltage of the sub-pixel that first time sampling obtains or medium voltage; K
nthe threshold voltage of the sub-pixel that this sampling obtains or medium voltage; α
0the weighting parameters of the Controlling and compensating use of original sub-pixel; α
1the weighting parameters that sampling correcting and compensation for the first time uses; α
nthe weighting parameters that this sampling correcting uses with compensation;
E) the calibration and compensation value of each sub-pixel and the image of actual displayed are carried out fitting operation, described fitting operation is stored the Controlling and compensating value of each sub-pixel of OLED display and the planimetric coordinates of each pixel, forms Controlling and compensating parameter matrix; Carried out adding computing with corresponding compensating parameter by the sub-pixel value of each sub-pixel real image of OLED display, obtain the final motivation value of each sub-pixel, the final motivation value of input sub-pixel drives corresponding sub-pixel.
Embodiment four
A self checking driving method for OLED display, described method comprises the steps:
A) OLED display work 0-10000 hour period, once sampling was corrected every 1000 hours; 10000-50000 hour period of OLED display work, once corrected sampling every 800 hours; 50000-100000 hour period of OLED display work, once corrected sampling every 500 hours; OLED display work more than 100000 hours period, once corrected sampling every 100 hours; Sampling described in OLED display can be carried out during starting shooting;
B) in sampling period, complete by 1080 independent samples the medium voltage measuring threshold voltage and/or OLED; After carrying out 1080 samplings to the medium voltage of threshold voltage and/or OLED, getting intermediate value is final measurement;
The corresponding relation of each sub-pixel c) setting up OLED screen and the threshold voltage measured and/or OLED medium voltage; The threshold voltage of each sub-pixel that sampling is obtained and/or OLED medium voltage, and time and again sample the before this threshold voltage and/or OLED medium voltage that obtain are by formula K=(α
0| K
0-K
n|+α
1| K
1-K
n|+... + α
n-1| K
n-1-K
n|)/(n+1) carry out mathematic interpolation, obtain the calibration and compensation value of each pixel, and preserve the calibration and compensation value of the pixel changed; Formula illustrates: K this verify the Controlling and compensating value of final sub-pixel; K
0the threshold voltage of original sub-pixel or medium voltage; K
1the threshold voltage of the sub-pixel that first time sampling obtains or medium voltage; K
nthe threshold voltage of the sub-pixel that this sampling obtains or medium voltage; α
0the weighting parameters of the Controlling and compensating use of original sub-pixel; α
1the weighting parameters that sampling correcting and compensation for the first time uses; α
nthe weighting parameters that this sampling correcting uses with compensation;
D) the calibration and compensation value of each sub-pixel and the image of actual displayed are carried out fitting operation, described fitting operation is stored the Controlling and compensating value of each sub-pixel of OLED display and the planimetric coordinates of each pixel, forms Controlling and compensating value matrix; Carried out adding computing with corresponding offset by the sub-pixel value of each sub-pixel real image of OLED display, obtain the final motivation value of each sub-pixel, the final motivation value of input sub-pixel drives corresponding sub-pixel.
Adopt the method for embodiment of the present invention can solve the even color of OLED display screen brightness disproportionation increase in time and occur the problem that decays, improve the chroma-luminance homogeneity of display screen, reduce more really, show image; Use described method, OLED display producer significantly can improve dispatching from the factory yields and actual life of OLED screen curtain, ensures the color consistency of OLED screen curtain in life cycle.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.Be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the most wide region consistent with principle disclosed herein and features of novelty.
Claims (7)
1. a self checking driving method for OLED display, is characterized in that, described method comprises the steps:
A) OLED display is sampled to OLED screen every a unit period;
B) in sampling period, the medium voltage of threshold voltage and/or OLED is measured;
The corresponding relation of each sub-pixel c) setting up OLED screen and the threshold voltage measured and/or OLED medium voltage;
D) threshold voltage/of each sub-pixel obtained sampling or OLED medium voltage are weighted average and/or average and/or mathematic interpolation, obtain the calibration and compensation value of each pixel, and preserve it;
E) the calibration and compensation value of each sub-pixel and the image of actual displayed are carried out fitting operation, obtain the final motivation value of each sub-pixel, the final motivation value of input sub-pixel drives corresponding sub-pixel.
2. the self checking driving method of OLED display as claimed in claim 1, is characterized in that, described step e) in fitting operation be:
E1) the Controlling and compensating value of each sub-pixel of OLED display and the planimetric coordinates of each pixel are stored, form Controlling and compensating value matrix;
E2) sub-pixel value of each sub-pixel real image of OLED display is carried out adding computing with corresponding offset, obtain the final motivation value of each sub-pixel.
3. the self checking driving method of OLED display as claimed in claim 2, is characterized in that, step b) in threshold voltage, OLED medium voltage be carry out independent sample measurement respectively.
4. the self checking driving method of OLED display as claimed in claim 3, it is characterized in that, after carrying out multiple repairing weld to threshold voltage and/or OLED medium voltage, getting intermediate value is final measurement.
5. the self checking driving method of OLED display as claimed in claim 4, is characterized in that, steps d) in each calculate after upgrade the calibration and compensation value of part or all of OLED sub-pixel.
6. the self checking driving method of OLED display as claimed in claim 5, is characterized in that, the unit period that step a) is sampled can be change; Along with OLED display increases service time, can shorten or extend its sampling period.
7. the self checking driving method of the OLED display as described in claim as arbitrary in claim 1-6, is characterized in that, OLED display sampling can during starting shooting and/or standby period and/or shutdown during carry out.
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| CN106847176A (en) * | 2017-03-02 | 2017-06-13 | 西安交通大学 | A kind of OLED life-spans improve algorithm and device |
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| CN108269519A (en) * | 2017-01-03 | 2018-07-10 | 昆山国显光电有限公司 | It determines voltage compensation value, eliminate the method, apparatus of mura and display screen body |
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Application publication date: 20141231 |