CN107507571B - A kind of couple of AMOLED carries out the method and device of external optical compensation - Google Patents
A kind of couple of AMOLED carries out the method and device of external optical compensation Download PDFInfo
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- CN107507571B CN107507571B CN201710749894.8A CN201710749894A CN107507571B CN 107507571 B CN107507571 B CN 107507571B CN 201710749894 A CN201710749894 A CN 201710749894A CN 107507571 B CN107507571 B CN 107507571B
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- 229920001621 AMOLED Polymers 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 36
- 230000003287 optical effect Effects 0.000 title claims abstract description 27
- 238000003384 imaging method Methods 0.000 claims description 25
- 230000007547 defect Effects 0.000 claims description 15
- 238000004020 luminiscence type Methods 0.000 claims description 9
- 241001270131 Agaricus moelleri Species 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
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- 238000004519 manufacturing process Methods 0.000 description 3
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- 238000003705 background correction Methods 0.000 description 1
- 238000003708 edge detection Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
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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
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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
- 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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
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Abstract
The present invention provides the methods that a kind of couple of AMOLED carries out external optical compensation, comprising the following steps: S1, measures the light emission luminance otherness between the pixel of display screen and pixel to the image of AMOLED acquisition；S2, the light emission luminance-grayscale standard feature described according to gamma curve, are adjusted driving current.The present invention also provides the devices that a kind of couple of AMOLED carries out external optical compensation.The beneficial effects of the present invention are: improving the accuracy of compensation brightness measurement, compensation effect is preferable, is suitable for large scale AMOLED and detects.
Description
Technical Field
The present invention relates to computer vision inspection, and more particularly, to a method and apparatus for performing external optical compensation on an AMOLED.
Background
The active matrix organic light emitting diode display (AMOLED) has the characteristics of fast response, higher contrast ratio, wide viewing angle, wide color gamut, no backlight source and the like. With the increase of the demand and the capacity of the AMOLED, the optical detection is used as a back-end process step of the AMOLED production, and plays an important role in ensuring the quality of a factory product and analyzing the poor front-end process. In the production process of the AMOLED display screen, due to the reasons of materials, processes and the like, the phenomenon of uneven display brightness of a picture of a part of products, namely Mura, can occur. The external compensation system for the AMOLED process eliminates Mura of the display screen with the Mura defect through an advanced sub-pixel level optical imaging technology and a software algorithm, so that the display of the display screen meets the requirement of the shipment specification of a panel factory, and the yield of the display screen in mass production is improved.
At present, the external optical compensation brightness measurement accuracy is low, the compensation effect is poor, and the method is not suitable for large-size AMOLED detection.
Disclosure of Invention
In order to solve the problems in the prior art, the present invention provides a method and an apparatus for performing external optical compensation on an AMOLED.
The invention provides a method for carrying out external optical compensation on an AMOLED, which comprises the following steps: s1, measuring brightness difference between pixels of the display screen according to the image collected by the AMOLED; s2, adjusting the driving current according to the standard character of the brightness-gray scale described by the Gamma curve.
As a further improvement of the invention, the image acquired by the AMOLED comprises: respectively acquiring a plurality of images to be processed of first ash and second ash … … eighth ash in red, green and blue channels obtained by the AMOLED;
the difference of the brightness of the light emitted between the pixels comprises the following steps: relative differences in pixel emission luminance;
the measuring of the brightness difference between pixels of the display screen by the image collected by the AMOLED comprises the following steps: extracting the relative brightness of each pixel on any one collected AMOLED image; the standard characteristic of the luminance-gray scale described according to the Gamma curve comprises: fitting the brightness value of each pixel at the 8 gray scales and the Gamma curve of the gray scale value;
the adjusting the driving current comprises: adjusting the driving current of each sub-pixel of red, green and blue at 0-255 gray scales;
the adjusting of the driving current according to the standard characteristic of the luminance-gray scale described by the Gamma curve comprises the following steps: the drive current correction is performed for all pixels deviating from the emission standard according to the standard gray-scale-luminance curve.
As a further improvement of the present invention, the measuring the brightness difference between pixels of the display screen from the image collected by the AMOLED further includes: the method comprises the steps of determining the imaging position of a pixel on an image, dividing an imaging area and estimating the relative brightness of the pixel.
As a further improvement of the present invention, the determining the position of the pixel imaging on the image by measuring the pixel-to-pixel brightness difference of the display screen for the image collected by the AMOLED further includes:
for pixels with point defects, line defects, surface defects or non-luminescence, pixel points at the imaging center position cannot be determined, and the imaging position of the next pixel is estimated by using the equidistant spacing characteristic of the pixel positions; judging whether the total number of all the detected position points is consistent with the total number of the AMOLED pixels, and if not, detecting the imaging position again;
the adjusting the driving current according to the standard characteristic of the luminance-gray scale described by the Gamma curve further comprises: and for the pixels with point defects, line defects, surface defects and non-luminescence on the image acquired by the AMOLED, the extracted brightness is not subjected to Gamma curve fitting, and the value is reassigned according to a specific gray-scale value.
As a further improvement of the present invention, the determining of the imaging position corresponding to each AMOLED pixel on the image, using the equidistant spacing characteristic of the pixel imaging positions to estimate the next pixel imaging position, further comprises:
and calculating the size information of the CCD pixels at equal intervals according to the integral image inclination angle and the corner points of the external rectangles of the light-emitting areas.
As a further improvement of the present invention, the method for adjusting the driving current according to the standard characteristics of the luminance-gray scale described by the Gamma curve further comprises: correcting the background with uneven image brightness; and (4) denoising the image at low frequency.
As a further improvement of the invention, the light intensity information of the AMOLED sample from the light-emitting point is received by the high-resolution CCD camera light-sensitive surface, converted into the corresponding light-emitting intensity value of the screen through the image processing system, compared with the standard brightness data under the corresponding gray scale, the adjustment quantity of the input analog signal of the sub-pixel is calculated, and the driving current of the AMOLED sample is adjusted by the analog signal generator driving compensation module.
As a further improvement of the invention, the AMOLED display device comprises AMOLED display units, a plurality of AMOLED display units and a plurality of AMOLED display units, wherein the AMOLED display units are arranged in the AMOLED display units; and extracting the brightness difference between the AMOLED pixels, and adjusting the driving signals of the pixels according to the Gamma light-emitting brightness standard.
The invention also provides a device for performing external optical compensation on the AMOLED, which comprises a lens, a CCD camera, an AMOLED sample, an analog signal generator and an image processing system, wherein the AMOLED sample is connected with the analog signal generator, the analog signal generator is connected with the image processing system, the image processing system is connected with the CCD camera, the CCD camera is connected with the lens, and the lens is positioned above the AMOLED sample.
The invention has the beneficial effects that: by the scheme, the accuracy of the compensation brightness measurement is improved, the compensation effect is good, and the AMOLED compensation device is suitable for large-size AMOLED detection.
Drawings
Fig. 1 is a flow chart illustrating a method for external optical compensation of an AMOLED according to the present invention.
Fig. 2 is a schematic diagram of an algorithm process of a method for performing external optical compensation on an AMOLED according to the present invention.
Fig. 3 is an optical compensation diagram of a method for external optical compensation of an AMOLED according to the present invention.
FIG. 4 is a schematic diagram of an apparatus for external optical compensation of an AMOLED according to the present invention.
Detailed Description
The invention is further described with reference to the following description and embodiments in conjunction with the accompanying drawings.
As shown in fig. 1 to 3, a method of external optical compensation of an AMOLED includes:
measuring the luminescence difference between pixels of the image collected by the AMOLED;
and adjusting the driving signal of each sub-pixel according to the Gamma light-emitting brightness standard.
As shown in fig. 4, the present invention further provides a device for external optical compensation of an AMOLED, including a lens 1, a CCD Camera 2, an AMOLED sample 3, an analog signal generator 4, and an image processing system 5, wherein the AMOLED sample 3 is connected to the analog signal generator 4, the analog signal generator 4 is connected to the image processing system 5, the image processing system 5 is connected to the CCD Camera 2 through a conducting wire (Camera Link)6, the CCD Camera 2 is connected to the lens 1, and the lens 1 is located above the AMOLED sample 3.
The measuring of the luminescence difference between the pixels by using the image collected by the AMOLED specifically includes:
the images collected for the AMOLED comprise: collecting a plurality of images to be processed of red, green, blue, first gray and second gray … … eighth gray respectively for the AMOLED;
correcting the position of the acquired image to ensure that the target area of the image is kept horizontal and vertical in the imaging area; the influence of CCD camera imaging noise on data authenticity is reduced by a low-frequency denoising method based on image processing;
the pixel-to-pixel luminescence difference includes: the relative difference of the pixel brightness when different gray values are measured through image processing, and the difference of the change rule of each pixel brightness along with the gray values is fitted through a curve;
the method for measuring the luminescence difference between the pixels of the display screen specifically comprises the following steps: positioning and dividing an imaging area of each light-emitting pixel on any image acquired by the AMOLED;
and calculating the position distance between each pixel, including the distance in the transverse direction and the longitudinal direction.
The position distance is calculated, the boundary of the target area is obtained by using an edge detection algorithm based on image processing, four corner points are detected, and the local adjacent pixel imaging area and the central interval thereof are reversely deduced by using global position information.
And determining the pixel positions, including determining the positions of defect points (dark points), line defects and Touch points (covering points), traversing the image overall situation by using a vector search method, and finding the coordinates of the points with the missing positions until the position information corresponds to the sub-pixels of the AMOLED one by one. Otherwise, the pixel imaging position is redetected.
The position information corresponds to the AMOLED sub-pixel coordinates one by one, whether the number of the position information is consistent with the number of the sub-pixels or not is judged, and if the inconsistency is judged to be positioning failure, the AMOLED sub-pixel coordinates are judged to be positioning failure.
The coordinates of the position information are the centers of the imaging areas of the pixels, the areas in the equal interval ranges of the upper, the lower, the left and the right belong to the luminous imaging areas of the pixels, and the areas are added according to the weight to be used as the relative value of the brightness of the pixels;
the determination of the position information only needs to use the image measurement of one gray scale, the positioning of other gray scales is the same, and the selected gray scale for imaging positioning is the intermediate brightness gray scale;
the brightness difference between pixels of the red, green and blue images is calculated respectively;
the characteristics according to the Gamma light-emitting rule specifically comprise: for each color channel, performing Gamma curve fitting on the brightness value and the gray value of each pixel at the acquired 8 gray levels;
the Gamma curve fitting uses the form of a power exponential function to calculate two coefficient values, and the formula is as follows:
Lumiance＝a(〖Gray+b)〗γ (1)
the brightness data is fit for saving coefficient data for generating compensation coefficient;
according to the Gamma light-emitting rule, the formula form of the Gamma standard curve is as follows:
Brigltness＝Gray2.2 (2)
preferably, the adjusting the driving signal specifically includes: adjusting the driving signal of each sub-pixel of red, green and blue corresponding to each gray scale of 0-255;
the drive signal adjustment means that the drive signal deviation of the light-emitting deviation pixel is reversely solved according to the standard brightness value of the corresponding gray scale, and the correct input signal is corresponded;
the current adjustment is carried out on each sub-pixel of the luminous deviation, and comprises signal adjustment on a red channel, a green channel and a blue channel; the signal adjustment of the white gray scale is the value respectively adjusted by red, green and blue as the result of white adjustment;
preferably, the adjusting the driving circuit according to the characteristics of the Gamma light emitting rule specifically includes: the drive signals are corrected for all pixels deviating from the emission standard according to the standard gray-scale-luminance curve.
According to the Gamma luminance standard, adjust the driving signal, also include: correcting the background with uneven image brightness;
the uneven background is introduced by the camera imaging process, the uneven background correction is carried out on the image by using a visual sensitivity function of which the machine vision meets the visual standard of human eyes,
the method for improving the brightness uniformity specifically comprises the following steps: before the compensation is calculated, after the brightness is extracted, the brightness uniformity value of the three-color channel of the whole AMOLED screen is calculated;
shooting brightness data of AMOLED luminescence collected after compensation, repeating the brightness extraction step to obtain a brightness relative value and calculate uniformity, comparing with the data before compensation, performing similar comparison at different gray scales, and evaluating the uniformity improvement ratio.
The method and the device for performing external optical compensation on the AMOLED have the characteristics of high optical measurement and luminous point positioning precision, wide screen specification application range, high algorithm operation efficiency and the like. The AMOLED luminance uniformity measuring and external driving current adjusting method mainly comprises an AMOLED luminance uniformity measuring part and an external driving current adjusting part. Specifically, the light intensity information of the AMOLED sample 3 from the light-emitting point is received by the light-sensitive surface of the high-resolution CCD camera 2, converted into the corresponding light-emitting intensity value of the screen through the image processing system 5, compared with the standard brightness data under the corresponding gray scale, the adjustment quantity of the input analog signal of the sub-pixel is calculated, and the analog signal generator 4 is used for driving the compensation module to adjust the input signal. The traditional image acquisition system is prevented from being limited by low resolution and low signal-to-noise ratio under dark light, and is not suitable for the brightness measurement of the sub-pixels of the large-size AMOLED display screen; on the basis, the accurate measurement and real-time compensation of the optical data uniformity of the high-resolution AMOLED display are realized by utilizing an image processing-based luminous point positioning algorithm and adopting a polynomial brightness-gray scale curve fitting algorithm. According to the assessment standard of SEMU international semiconductor measurement association, the luminous uniformity of the display screen before and after compensation is obviously improved; the light emitting consistency of the AMOLED is improved, and the product yield is improved.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A method of external optical compensation of an AMOLED, comprising the steps of:
s1, measuring brightness difference between pixels of the display screen according to the image collected by the AMOLED;
s2, adjusting the driving current according to the standard characteristic of the luminance-gray scale described by the Gamma curve;
wherein,
the acquired images of the AMOLED comprise: respectively acquiring a plurality of images to be processed of first ash and second ash … … eighth ash in red, green and blue channels obtained by the AMOLED;
the difference of the brightness of the light emitted between the pixels comprises the following steps: relative differences in pixel emission luminance;
the measuring of the brightness difference between pixels of the display screen by the image collected by the AMOLED comprises the following steps: extracting the relative brightness of each pixel on any one collected AMOLED image;
the standard characteristic of the luminance-gray scale described according to the Gamma curve comprises: fitting the brightness value of each pixel at the 8 gray scales and the Gamma curve of the gray scale value;
the adjusting the driving current comprises: adjusting the driving current of each sub-pixel of red, green and blue at 0-255 gray scales;
the adjusting of the driving current according to the standard characteristic of the luminance-gray scale described by the Gamma curve comprises the following steps: the drive current correction is performed for all pixels deviating from the emission standard according to the standard gray-scale-luminance curve.
2. The method for external optical compensation of an AMOLED of claim 1, wherein: the measuring of the brightness difference between the pixels of the display screen according to the image collected by the AMOLED further includes: the method comprises the steps of determining the imaging position of a pixel on an image, dividing an imaging area and estimating the relative brightness of the pixel.
3. A method for external optical compensation of an AMOLED as claimed in claim 2, wherein:
the method for determining the brightness difference between the pixels of the display screen and the brightness of the pixels by measuring the brightness difference between the pixels of the display screen and the images collected by the AMOLED and the position of the pixel imaging on the images further comprises the following steps:
for pixels with point defects, line defects, surface defects or non-luminescence, pixel points at the imaging center position cannot be determined, and the imaging position of the next pixel is estimated by using the equidistant spacing characteristic of the pixel positions; judging whether the total number of all the detected position points is consistent with the total number of the AMOLED pixels, and if not, detecting the imaging position again;
the adjusting the driving current according to the standard characteristic of the luminance-gray scale described by the Gamma curve further comprises: and for the pixels with point defects, line defects, surface defects and non-luminescence on the image acquired by the AMOLED, the extracted brightness is not subjected to Gamma curve fitting, and the value is reassigned according to a specific gray-scale value.
4. A method for external optical compensation of an AMOLED as claimed in claim 2, wherein: determining an imaging position corresponding to each AMOLED pixel on the image, and estimating a next pixel imaging position by using the pixel imaging position equidistant interval characteristic, further comprising:
and calculating the size information of the CCD pixels at equal intervals according to the integral image inclination angle and the corner points of the external rectangles of the light-emitting areas.
5. The method for external optical compensation of an AMOLED of claim 1, wherein: the method for adjusting the driving current according to the standard characteristic of the luminance-gray scale described by the Gamma curve further comprises the following steps: correcting the background with uneven image brightness; and (4) denoising the image at low frequency.
6. The method for external optical compensation of an AMOLED of claim 1, wherein: the method comprises the steps of receiving light intensity information of an AMOLED sample from a light emitting point by using a high-resolution CCD camera photosensitive surface, converting the light intensity information into a corresponding light emitting intensity value of a screen through an image processing system, comparing the light emitting intensity value with standard brightness data under a corresponding gray scale, calculating the adjustment quantity of input analog signals of sub-pixels, and adjusting the driving current of the AMOLED sample by using an analog signal generator driving compensation module.
7. The method for external optical compensation of an AMOLED of claim 1, wherein: different gray scale images are collected by the AMOLED; and extracting the brightness difference between the AMOLED pixels, and adjusting the driving signals of the pixels according to the Gamma light-emitting brightness standard.
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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 |
| CN108492776B (en) * | 2018-03-29 | 2019-12-31 | 苏州佳智彩光电科技有限公司 | Intelligent external optical compensation method for AMOLED screen brightness unevenness |
| 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 |
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