CN107507571A - A kind of method and device that external optical compensation is carried out to AMOLED - Google Patents
A kind of method and device that external optical compensation is carried out to AMOLED Download PDFInfo
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- CN107507571A CN107507571A CN201710749894.8A CN201710749894A CN107507571A CN 107507571 A CN107507571 A CN 107507571A CN 201710749894 A CN201710749894 A CN 201710749894A CN 107507571 A CN107507571 A CN 107507571A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Picture Signal Circuits (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
The invention provides a kind of method that external optical compensation is carried out to AMOLED, comprise the following steps：S1, the image to AMOLED collections measure the luminosity otherness between the pixel of display screen and pixel；S2, the luminosity-GTG standard feature described according to gamma curve, are adjusted to driving current.Present invention also offers a kind of device that external optical compensation is carried out to AMOLED.The beneficial effects of the invention are as follows：The accuracy of compensation brightness measurement is improved, compensation effect is preferable, is detected suitable for large scale AMOLED.
Description
Technical field
The present invention relates to Computer Vision Detection, more particularly to a kind of method that external optical compensation is carried out to AMOLED and
Device.
Background technology
Active matrix organic light-emitting two level body display (AMOLED) is with reaction is very fast, contrast is higher, visual angle is wide, color
The features such as domain is wide, without backlight.With AMOLED demands and production capacity increase, the backend process that optical detection produces as AMOLED
Step, guarantee is dispatched from the factory product quality, FEOL is bad plays an important role for analysis.In AMOLED display screen production processes
Due to reasons such as material, techniques, have portioned product and the uneven phenomenon of picture display brightness, that is, Mura occur.For
The external compensation system of AMOLED techniques, which is that there will be display screen bad Mura, to pass through advanced sub-pixel-level optical imagery skill
Art and software algorithm eliminate Mura so that the display of display screen reaches the shipment specification requirement of panel factory, improves display screen volume production
Yield.
External optical compensation brightness measuring accuracy is low at present, and compensation effect is poor, is not suitable for large scale AMOLED detections.
The content of the invention
In order to solve the problems of the prior art, the invention provides a kind of side that external optical compensation is carried out to AMOLED
Method and device.
The invention provides a kind of method that external optical compensation is carried out to AMOLED, comprise the following steps：It is S1, right
The image of AMOLED collections measures the luminosity otherness between the pixel of display screen and pixel；S2, according to gamma curve institute
The luminosity described-GTG standard feature, is adjusted to driving current.
As a further improvement on the present invention, it is described that the image that AMOLED is collected is included：AMOLED is adopted respectively
The red, green, blue triple channel difference that collection obtains, the first ash, multiple pending images of the ash of the second ash ... the 8th；
Luminosity otherness includes between the pixel and pixel：The relative different of pixel light emission brightness；
The image to AMOLED collections measures the luminosity otherness between the pixel of display screen and pixel, wraps
Include：Respectively to the extraction of each pixel relative luminance on the AMOLED any images that collect；It is described according to gamma curve institute
The luminosity described-GTG standard feature, including：The brightness value of 8 GTGs and grey decision-making are being taken to each pixel
Gamma curve is fitted；
It is described that driving current is adjusted, including：The driving current of each sub-pixel of red, green, blue is every 0~255
The adjustment of individual GTG；
Luminosity-GTG the standard feature described according to gamma curve, is adjusted to driving current, bag
Include：According to gray scale-brightness curve of standard, current correction is driven to all pixels for deviateing emission standards.
As a further improvement on the present invention, the image to AMOLED collections measures the pixel of display screen and pixel
Between luminosity otherness, in addition to：The determination for the position being imaged to pixel on image, the division of imaging region, pixel phase
Estimation to brightness.
As a further improvement on the present invention, the image collected to AMOLED measures the pixel of display screen and picture
Plain brightness difference, the determination for the position being imaged to pixel on image, in addition to：
For point defect, line defect, planar defect or non-luminous pixel, the pixel of imaging center position can not be determined
Point, next pixel image space is estimated using location of pixels equi-spaced apart feature；Judge all location points detected
Whether sum is consistent with the total number of AMOLED pixels, if it is not, detecting image space again；
Luminosity-GTG the standard feature described according to gamma curve, is adjusted to driving current, also
Including：On the image collected for AMOLED, point defect, line defect, planar defect and non-luminous pixel, that extracts is bright
Degree is fitted its characteristics of luminescence without gamma curve, according to specific grey decision-making again assignment.
As a further improvement on the present invention, to the determination for the image space that each AMOLED pixel is corresponded on image,
Next pixel image space is estimated using pixel image space equi-spaced apart feature, in addition to：
According to the integral inclined angle of image and the angle point of the boundary rectangle of light-emitting zone, CCD pixel equi-spaced apart is calculated
Size information.
As a further improvement on the present invention, the luminosity described according to gamma curve-GTG standard feature, it is right
Driving current is adjusted, in addition to：Brightness of image uneven background is corrected；The low frequency denoising of image.
As a further improvement on the present invention, the spontaneous luminous point of AMOLED samples is received using high-resolution CCD camera photosurface
Intensity signal, the corresponding luminous intensity values of screen are converted into by image processing system, with normal brightness number under corresponding GTG
According to comparing, the adjustment amount of the input analog signal of sub-pixel is calculated, compensating module pair is driven using analog signal generator
The driving current of AMOLED samples is adjusted.
As a further improvement on the present invention, the different gray scale images by being gathered to AMOLED；By AMOLED pixels with
Luminance difference is extracted between pixel, and according to Gamma luminosity standards, signal adjustment is driven to pixel.
Present invention also offers it is a kind of to AMOLED carry out external optical compensation device, including camera lens, CCD camera,
AMOLED samples, analog signal generator and image processing system, wherein, the AMOLED samples occur with the analog signal
Device is connected, and the analog signal generator is connected with described image processing system, described image processing system and the CCD camera
Connection, the CCD camera are connected with the camera lens, and the camera lens is located on the AMOLED samples.
The beneficial effects of the invention are as follows：By such scheme, improve the accuracy of compensation brightness measurement, compensation effect compared with
It is good, detected suitable for large scale AMOLED.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet for the method that external optical compensation is carried out to AMOLED of the present invention.
Fig. 2 is a kind of algorithmic procedure schematic diagram for the method that external optical compensation is carried out to AMOLED of the present invention.
Fig. 3 is a kind of optical compensation schematic diagram for the method that external optical compensation is carried out to AMOLED of the present invention.
Fig. 4 is a kind of schematic diagram for the device that external optical compensation is carried out to AMOLED of the present invention.
Embodiment
The invention will be further described for explanation and embodiment below in conjunction with the accompanying drawings.
As shown in Figure 1 to Figure 3, a kind of method that external optical compensation is carried out to AMOLED, including：
By the emission difference between the image measurement pixel and pixel that are collected using AMOLED；
According to Gamma luminosity standards, the drive signal of each sub-pixel is adjusted.
As shown in figure 4, present invention also offers it is a kind of to AMOLED carry out external optical compensation device, including camera lens 1,
CCD camera 2, AMOLED samples 3, analog signal generator 4 and image processing system 5, wherein, the AMOLED samples 3 and institute
State analog signal generator 4 to connect, the analog signal generator 4 is connected with described image processing system 5, described image processing
System 5 is connected with the CCD camera 2 by wire (Camera Link) 6, and the CCD camera 2 is connected with the camera lens 1, institute
Camera lens 1 is stated to be located on the AMOLED samples 3.
The emission difference using between the image measurement pixel and pixel that are collected to AMOLED, specifically include：
It is described that the image that AMOLED is collected is included：Red, green, blue, the first ash, second will be gathered respectively to AMOLED
Multiple pending images of the ash of ash ... the 8th；
The image collected is done into position correction, makes the target area of the image keep level and vertical in imaging area；Base
In the low frequency denoising method of image procossing, reduce influence of the CCD camera imaging noise to data validity；
Emission difference includes between the pixel and pixel：Pixel is sent out during the different gray values measured by image procossing
The relative different of brightness, and each pixel light emission brightness is gone out with the difference between the changing rule of GTG by curve matching
Property；
Emission difference between the pixel and pixel according to measurement display screen, is specifically included：AMOLED is gathered respectively
To any image on each light emitting pixel imaging region positioning and division；
The positional distance between each pixel is calculated, includes the distance of horizontal and vertical both direction.
The calculation position distance, using the edge detection algorithm based on image procossing, the border of target area is obtained, examined
Four angle points are measured, local adjacent pixel imaging region and its middle heart septum are retrodicted with global position information.
The determination of the location of pixels, including defect point (dim spot), the determination of line defect, Touch points (covering point) position,
Image overall is traveled through using vector search method, finds the coordinate of the point of topagnosis, until by the son of positional information and AMOLED
Pixel corresponds.Otherwise, pixel image space is detected again.
The positional information and AMOLED sub-pixels coordinate correspond, setting judge positional information number whether with sub- picture
The number of element is consistent, inconsistent to be judged as positioning failure.
The coordinate of the positional information is the center of the imaging region of pixel, up and down at equal intervals in the range of region all
Belong to the luminescence imaging area of the pixel, and add by weight and the brightness relative value as the pixel；
The determination of the positional information only needs to use the image measurement of a GTG, and the positioning of other GTGs is also same
Sample is consistent, and the GTG for being used for being imaged positioning of selection is intermediate luminance GTG；
The image of the color of red, green, blue three will calculate the luminance difference between its pixel and pixel respectively；
It is described according to Gamma luminescence law characteristics, specifically include：To each Color Channel, each pixel is taking 8 ashes
The brightness value of rank and the gamma curve of grey decision-making are fitted；
The gamma curve fitting, uses two coefficient values of form calculus of power exponential function, formula：
Lumiance=a (" Gray+b) "γ (1)
The brightness data is fitted to coefficient data preservation, to make the generation of penalty coefficient to use；
It is described according to Gamma luminescence laws, the formula form of Gamma standard curves：
Brigltness=Gray2.2 (2)
Preferably, described be adjusted to drive signal, specifically include：The drive signal of each sub-pixel of red, green, blue
Corresponding to the adjustment of 0~255 each GTG；
The drive signal adjustment refers to, according to the normal brightness value of corresponding GTG, the driving of the luminous deviation pixel of reverse
Deviation of signal, correspond to correct input signal；
The sub-pixel to each luminous deviation carries out electric current adjustment, including the signal of three passages of red, green, blue is adjusted
It is whole；The signal adjustment of white GTG, is the value adjusted respectively with the color of red, green, blue three, the result as white adjustment；
Preferably, it is described according to Gamma luminescence law characteristics, drive circuit is adjusted, specifically included：According to standard
Gray scale-brightness curve, all pixels for deviateing emission standards are driven by signal are corrected.
According to Gamma luminosity standards, drive signal is adjusted, in addition to：To brightness of image uneven background
Correction；
The uneven background, introduced by camera imaging process, the vision of human eye vision standard is met using machine vision
Sensitivity function, uneven background correction is carried out to image,
The raising brightness uniformity, specifically includes：Before calculating compensation, after brightness extraction, the whole color of AMOLED screens three
The brightness uniformity numerical value of passage；
The brightness data that the AMOLED collected after shooting compensation lights, repeats the step of brightness is extracted, obtains brightness phase
Compared to being worth and calculating the data before the uniformity, with compensation, similar comparison is all done in different GTGs, assessed the uniformity and carry
The ratio risen.
A kind of method and device that external optical compensation is carried out to AMOLED provided by the invention, has optical measurement and hair
The features such as optical codes precision is high, screen specification is applied widely, algorithm operational efficiency is fast.It is luminous uniform mainly to include AMOLED
Property measurement and external drive electric current adjust two parts.Specifically, received using the photosurface of high-resolution CCD camera 2
The intensity signal of 3 spontaneous luminous point of AMOLED samples, the corresponding luminous intensity values of screen are converted into by image processing system 5, with
Standard brightness data compares under corresponding GTG, calculates the adjustment amount of the input analog signal of sub-pixel, is sent out using analog signal
Raw device 4 drives compensating module to be adjusted input signal.Avoid traditional image capturing system, be limited to low resolution and
Low signal-to-noise ratio under half-light line, the brightness measurement of large-sized AMOLED display screens sub-pixel is not suitable for it；It is sharp on this basis
With the luminous point location algorithm based on image procossing, using polynomial brightness-gray scale curve fitting algorithm, high score is realized
The accurate measurement of the optical data homogeneity of resolution displayer and real-Time Compensation.Measured and assisted according to SEMU international semiconductors
Meeting evaluation criteria, display screen uniformity of luminance is obviously improved before and after compensation；AMOLED emission uniformity is improved, is improved
Product yield.
Above content is to combine specific preferred embodiment further description made for the present invention, it is impossible to is assert
The specific implementation of the present invention is confined to these explanations.For general technical staff of the technical field of the invention,
On the premise of not departing from present inventive concept, some simple deduction or replace can also be made, should all be considered as belonging to the present invention's
Protection domain.
Claims (9)
- A kind of 1. method that external optical compensation is carried out to AMOLED, it is characterised in that comprise the following steps：S1, the image to AMOLED collections measure the luminosity otherness between the pixel of display screen and pixel；S2, the luminosity-GTG standard feature described according to gamma curve, are adjusted to driving current.
- 2. the method according to claim 1 that external optical compensation is carried out to AMOLED, it is characterised in that：It is described right The image that AMOLED is collected includes：The red, green, blue triple channel that is collected respectively to AMOLED respectively, first ash, the Multiple pending images of the ash of two ash ... the 8th；Luminosity otherness includes between the pixel and pixel：The relative different of pixel light emission brightness；The image to AMOLED collections measures the luminosity otherness between the pixel of display screen and pixel, including：Point The extraction of other each pixel relative luminance on the AMOLED any images that collect；Luminosity-GTG the standard feature described according to gamma curve, including：8 are being taken to each pixel The brightness value of GTG and the gamma curve of grey decision-making are fitted；It is described that driving current is adjusted, including：The driving current of each sub-pixel of red, green, blue is in 0~255 each ash The adjustment of rank；Luminosity-GTG the standard feature described according to gamma curve, is adjusted to driving current, including： According to gray scale-brightness curve of standard, current correction is driven to all pixels for deviateing emission standards.
- 3. the method according to claim 2 that external optical compensation is carried out to AMOLED, it is characterised in that：It is described right The image of AMOLED collections measures the luminosity otherness between the pixel of display screen and pixel, in addition to：To picture on image The determination of the position of element imaging, the division of imaging region, the estimation of pixel relative luminance.
- 4. the method according to claim 3 that external optical compensation is carried out to AMOLED, it is characterised in that：It is described right The image that AMOLED is collected measures the pixel of display screen and pixel intensity luminance difference, the position being imaged to pixel on image Determination, in addition to：For point defect, line defect, planar defect or non-luminous pixel, the pixel of imaging center position can not be determined, is made Next pixel image space is estimated with location of pixels equi-spaced apart feature；Judging the sum of all location points detected is It is no consistent with the total number of AMOLED pixels, if it is not, detecting image space again；Luminosity-GTG the standard feature described according to gamma curve, is adjusted to driving current, also wraps Include：On the image collected for AMOLED, point defect, line defect, planar defect and non-luminous pixel, the brightness extracted Its characteristics of luminescence is fitted without gamma curve, according to specific grey decision-making again assignment.
- 5. the method according to claim 3 that external optical compensation is carried out to AMOLED, it is characterised in that：To right on image The determination of the image space of each AMOLED pixel is answered, estimates next picture using pixel image space equi-spaced apart feature Plain image space, in addition to：According to the integral inclined angle of image and the angle point of the boundary rectangle of light-emitting zone, the size of calculating CCD pixel equi-spaced apart Information.
- 6. the method according to claim 1 that external optical compensation is carried out to AMOLED, it is characterised in that：According to Gamma The luminosity that curve is described-GTG standard feature, is adjusted to driving current, in addition to：It is uneven to brightness of image Background correction；The low frequency denoising of image.
- 7. the method according to claim 1 that external optical compensation is carried out to AMOLED, it is characterised in that：Utilize high-resolution CCD camera photosurface receives the intensity signal of the spontaneous luminous point of AMOLED samples, and it is corresponding to be converted into screen by image processing system Luminous intensity values, compared with standard brightness data under corresponding GTG, calculate the adjustment amount of the input analog signal of sub-pixel, The driving current of AMOLED samples is adjusted using analog signal generator driving compensating module.
- 8. the method according to claim 1 that external optical compensation is carried out to AMOLED, it is characterised in that：By right The different gray scale images of AMOLED collections；Luminance difference between AMOLED pixels and pixel is extracted, according to Gamma luminances Scale is accurate, and signal adjustment is driven to pixel.
- A kind of 9. device that external optical compensation is carried out to AMOLED, it is characterised in that：Including camera lens, CCD camera, AMOLED samples Product, analog signal generator and image processing system, wherein, the AMOLED samples are connected with the analog signal generator, The analog signal generator is connected with described image processing system, and described image processing system is connected with the CCD camera, institute State CCD camera to be connected with the camera lens, the camera lens is located on the AMOLED samples.
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| CN108259763A (en) * | 2018-03-27 | 2018-07-06 | 苏州佳智彩光电科技有限公司 | A kind of camera and OLED signal generator Fast synchronization image-pickup methods |
| CN108492776A (en) * | 2018-03-29 | 2018-09-04 | 苏州佳智彩光电科技有限公司 | A kind of AMOLED screens brightness disproportionation intelligent external optical compensation method |
| CN108538246A (en) * | 2018-04-20 | 2018-09-14 | 京东方科技集团股份有限公司 | Display screen matrix data capture method and device, pixel compensation method and system |
| CN108806576A (en) * | 2018-05-30 | 2018-11-13 | 南京中电熊猫平板显示科技有限公司 | Display device, panel control device and application method |
| CN109686343A (en) * | 2019-01-21 | 2019-04-26 | 武汉精立电子技术有限公司 | A kind of Color Mura removing method |
| CN109961739A (en) * | 2019-04-18 | 2019-07-02 | 京东方科技集团股份有限公司 | Show adjustment method, compensation method and device, display device and storage medium |
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