CN108682365B - OLED color spot detection and repair integrated system and method - Google Patents

OLED color spot detection and repair integrated system and method Download PDF

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CN108682365B
CN108682365B CN201810349109.4A CN201810349109A CN108682365B CN 108682365 B CN108682365 B CN 108682365B CN 201810349109 A CN201810349109 A CN 201810349109A CN 108682365 B CN108682365 B CN 108682365B
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brightness
panel
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CN108682365A (en
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冯晓帆
郑增强
刘钊
马尔威
吴红君
刘荣华
沈亚非
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Wuhan Jingce Electronic Group Co Ltd
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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
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
    • 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]
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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Abstract

The invention belongs to the technical field of panel detection, and discloses an OLED color spot detection and repair integrated system and method, wherein the system comprises a computing unit, an optical measurement unit and a driving unit; the driving unit acts on the panel to drive the panel to light white pictures with different gray scales; the optical measurement unit is used for shooting a pixel brightness measurement picture and a chrominance measurement picture of the panel under a white picture under the trigger of the driving unit; the computing unit is used for obtaining the brightness and the chroma of each pixel according to the brightness measurement picture and the chroma measurement picture and determining the color spot type and the color grade according to the brightness and the chroma measurement picture; calculating compensation data of each channel of R/G/B according to the brightness and the chromaticity of each gray scale, converting the compensation data into a format which can be received by a driving chip of the panel, and sending the format to a memory of the panel; under the control of the demura enable state register, calling the compensation data in the memory to repair color spots on the panel to be repaired; the invention reduces the testing time by 2/3, greatly improves the working efficiency of color spot detection and compensation and ensures that the brightness uniformity of the white picture is compensated better.

Description

OLED color spot detection and repair integrated system and method
Technical Field
The invention belongs to the technical field of display, and particularly relates to an OLED color spot detection and repair integrated system and method.
Background
Due to the limitation of crystallization process, the thin film transistors (LTPS TFTs) at different positions of the LTPS TFTs fabricated on the large-area glass substrate often have non-uniformity in electrical parameters such as threshold voltage, mobility, etc., which can be converted into current difference and brightness difference of the OLED display device and be perceived by human eyes, i.e., mura (color mura) phenomenon. The mura repairing technology is a technology for eliminating the mura phenomenon of the display and enabling the brightness of a picture to be uniform.
In the method for eliminating Mura of the OLED display panel disclosed in chinese patent application No. 201610200089.5 in the prior art, a corresponding calculation formula is selected by comparing a gamma value of the OLED display panel with a local gamma value of a current display gray scale to calculate a compensation gray scale to be adopted, the OLED display panel is made to display the currently obtained compensation gray scale, and whether a preset condition for ending the compensation gray scale calculation is reached is determined, if the preset condition for ending the compensation gray scale calculation is not reached, iterative calculation is continuously performed until the preset condition for ending the compensation gray scale calculation is reached, so that Mura of the OLED display panel can be eliminated quickly and effectively, uniformity of brightness of the OLED display panel is ensured, and display quality of the OLED display panel is improved. However, the technical scheme needs more iterations, and the repair time is long.
For another example, chinese patent application No. 201610911121.0 discloses a method and apparatus for optimizing maximum brightness of OLED Mura compensation, the method includes: inputting a display panel brightness matrix; partitioning the liquid crystal panel brightness matrix; collecting the brightness value of each sampling point of the subarea; calculating the sampling points pairwise to obtain a new brightness value of the sampling points; calculating target brightness based on the position of the sampling point and the new brightness value to obtain a target brightness matrix; outputting a target brightness matrix of the liquid crystal panel; the invention can improve the brightness to a certain extent and reduce the Mura phenomenon; however, this solution only focuses on brightness and not on chroma, and therefore cannot compensate for color shift.
In view of the existing OLED color spot repairing technology, the brightness is mostly independently shot and extracted for compensation based on three R \ G \ B gray scales with different colors, and the following defects exist:
A. the time consumption is long, taking 6 gray scale pictures of R/G/B as an example, 18 pictures are required to be shot, and the low gray scale brightness and the low exposure time are longer;
B. because the OLED driving circuit has current limitation, the current of a single-channel picture (R/G/B picture) and the current of a multi-channel picture (such as a white picture) are not in a simple superposition or linear relationship, and the IRDROP of the R/G/B picture is possibly different from the IRDROP of the white picture, the single-color picture can be well compensated by independently extracting the brightness for compensation, but the compensation effect of the compensation data on the multi-channel picture cannot be optimal;
C. due to the existence of current limitation, the sum of the current values of the RGB single-color pictures is larger than the white picture current, the compensation single-color picture cannot be equal to the compensation white picture, so the compensation capability of the color cast Mura is poor, and the chromaticity offset condition before and after the compensation cannot be evaluated.
Disclosure of Invention
Aiming at least one point of the defects or the improvement requirements in the prior art, the invention provides an OLED color spot detection and repair integrated system and method, aiming at changing the traditional mode of singly shooting and extracting brightness for compensation based on three R \ G \ B gray scales with different colors into the mode of only using brightness data and chromaticity data extracted from a white picture for compensation, thereby improving the efficiency of OLED color spot detection and repair.
To achieve the above object, according to one aspect of the present invention, an integrated OLED color spot detection and repair system is provided, which includes a computing unit, an optical measurement unit, and a driving unit;
the optical measurement unit is connected with the calculation unit, and the driving unit acts on the OLED panel to be tested and is used for driving the panel to be tested to light the preprocessing picture and driving the OLED panel to be tested to light the white pictures with different gray scales; the number of white pictures and the gray scale are preset according to the requirements of a Demura circuit function module of the OLED panel to be tested;
the optical measurement unit is used for shooting and acquiring pixel brightness measurement pictures and block-level chromaticity measurement pictures of the panel to be measured under the preprocessing picture and the white picture under the triggering of the driving unit;
the calculating unit is used for acquiring the brightness and the chroma of each pixel according to the picture and determining the type and the grade of the color spot according to the brightness and the chroma of the pixel;
the compensation data of each channel of the R/G/B is calculated according to the brightness and the chrominance data of each gray scale, converted into a format which can be received by a driving chip of the panel to be detected and sent to a memory of the panel to be detected;
and when the panel to be detected is electrified, the stored data is called to carry out color spot repair on the panel to be detected through the demora enabling state register enabling color spot repair function.
Preferably, the OLED color spot detection and repair integrated system further includes an auxiliary environmental position control unit;
the environment position control unit comprises a darkroom, a dust removing device, a panel alignment mechanism and a light path adjusting mechanism;
the darkroom is used for accommodating the panel to be measured and the optical measurement unit so as to ensure low ambient light and eliminate the influence of external light on measurement;
the dust removal equipment is positioned in the darkroom and used for removing dust in the environment so as to eliminate the influence of the dust on high-precision brightness measurement;
the panel alignment mechanism is used for placing the panel to be measured to adjust the position of the panel to be measured, so that the center of the panel to be measured is positioned on the optical axis of the optical path, and the plane of the panel to be measured is parallel to the plane of the camera;
the light path adjusting mechanism is connected with the optical measuring unit and used for measuring the distance between a camera of the optical measuring unit and the panel to be measured, the size of the aperture and the position of the focusing ring.
Preferably, in the above-mentioned OLED color spot detection and repair integrated system, the optical measurement unit includes a luminance measurement unit and a chromaticity measurement unit which are parallel; the brightness measuring unit and the chroma measuring unit shoot the panel to be measured simultaneously; the brightness measurement unit shoots and obtains a brightness measurement picture of a pixel of a panel to be measured; the chroma measurement unit shoots and obtains a chroma measurement picture of the block level of the panel to be measured.
In order to achieve the object of the present invention, according to another aspect of the present invention, there is provided an OLED color spot detection and repair integrated system, including:
(1) a pretreatment step;
(1.1) driving a panel to be detected to light up an initial evaluation picture, simultaneously shooting the panel to be detected by a brightness measurement unit and a chrominance measurement unit to obtain a brightness measurement picture and a chrominance measurement picture, and respectively converting the brightness measurement picture and the chrominance measurement picture into brightness and chrominance information at a pixel level by a calculation unit; the initial evaluation picture is a white picture with 1 or more different gray scales;
(1.2) carrying out Mura initial judgment according to the brightness and chroma information; sending the panel judged as good to other processes of the normal processing flow; the panel to be detected which is judged to need color spot repair enters the processing of the step (1.3);
(1.3) judging the panel to be detected with the dead spots and the dead lines exceeding the set values as an abnormal product, and flowing the abnormal product into a rework station or a manual re-judgment station; and (3) transferring the panel to be detected with the dead pixel and the dead line within the set value to the step (2) for color spot compensation treatment.
(2) A color spot compensation step;
the method comprises the steps that a panel to be tested is driven to light white pictures with different gray scales, each white picture is lighted on the panel to be tested, a display picture of the panel to be tested is shot by a brightness measuring unit and a chromaticity measuring unit at the same time, and obtained brightness measuring pictures and chromaticity measuring pictures are converted into brightness and chromaticity data of each pixel by a computing unit;
the gray scale of the number of the white pictures is preset manually and is set according to the requirements of a Demura circuit function module of the panel to be tested.
(3) The computing unit computes compensation data according to the brightness and chrominance data of each gray scale and converts the compensation data into a format required by a driving chip of the panel to be tested; sending the data to a memory of a panel to be tested;
(4) and enabling the color spot repairing function to call the stored data to repair the color spots.
Preferably, the method for detecting and repairing the color spots of the OLED further comprises the following steps:
(5) and shooting an evaluation picture displayed by the panel to be tested after the color spot repair is enabled, and calculating to obtain a JND value or a Semu value according to the evaluation picture to obtain the color spot evaluation grade of the panel to be tested.
Preferably, in the above-mentioned OLED Demura method, in the step (3), the number of white frames and the gray scale of the frames are preset according to the requirements of the Demura circuit function module of the panel to be tested.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) according to the OLED color spot detection and repair integrated system and method, the brightness data and the chromaticity data extracted from the white picture are combined, so that the independent compensation of R \ G \ B is realized, the influence of inconsistency of defects of a W picture and the R \ G \ B picture caused by current limitation is compensated, and the brightness uniformity compensation of the white picture is better; compared with the method for only measuring and compensating the brightness of the monochromatic picture in the prior art, the system and the method for measuring and compensating the brightness of the monochromatic picture in the white picture have better compensation effect on the brightness and the chromaticity of the white picture;
(2) according to the OLED color spot detection and repair integrated system and method, the compensation of independent shooting and brightness extraction of three gray scales with different colors of R \ G \ B is not needed, only a white picture needs to be processed, the test time is reduced by 2/3, the test period can be greatly shortened, and the test efficiency is improved; because the measurement brightness is carried out on the white picture, the current limit of the white picture is already carried out during the measurement, and therefore the compensation data can eliminate the influence of the current limit; however, in the prior art, the influence of white picture current limitation is not considered when R/G/B picture measurement is adopted; in comparison, the technique of the invention can reduce the current limit influence of the panel, so that the white picture has more uniform brightness compared with other compensation methods; since the chromaticity measurement unit acquires color coordinate information, color cast Mura can be compensated.
Drawings
FIG. 1 is a system block diagram of one embodiment of an OLED Demura system provided by the present invention;
FIG. 2 is a schematic workflow diagram of an embodiment of the OLED Demura system provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention provides an embodiment of an OLED color spot detection and repair integrated system, which refers to FIG. 1 and comprises a calculation unit, an optical measurement unit and a drive unit;
the optical measurement unit is connected with the calculation unit, and the driving unit acts on the OLED panel to be tested and is used for driving the panel to be tested to light the preprocessing picture and driving the OLED panel to be tested to light the white pictures with different gray scales; the number and the gray scale of the white picture are preset according to the requirements of a Demura circuit function module of the OLED panel to be tested;
the optical measurement unit is used for shooting and acquiring pixel brightness measurement pictures of the OLED panel to be measured under the preprocessing picture and the white picture and block-level chromaticity measurement pictures under the triggering of the driving unit; the calculating unit is used for acquiring the brightness and the chroma of each pixel according to the picture and determining the type and the grade of the color spot according to the brightness and the chroma of the pixel; and the compensation data of each channel of R/G/B is calculated according to the brightness and chrominance data of each gray scale, converted into a format which can be received by a driving chip of the panel to be detected and sent to a memory of the panel to be detected, such as Flash or Ram;
when a panel to be tested is electrified, whether Demura effect enabling is started or not is determined by a value in a Demura enabling state register, if so, Ram downloads compensation data from a Flash response Demura data storage area, the compensation data are compared with a checksum in Flash data, and if the checksum and the checksum are completely the same, a Demura circuit function module starts to work, and the compensation effect is displayed; if the two are not consistent, the Demura circuit functional module does not work.
The driving unit in the embodiment includes an image signal generator (PG), a responding wire and an adapter plate; the optical measuring unit comprises a brightness measuring unit and a chromaticity measuring unit which are arranged in parallel; the brightness measuring unit and the chromaticity measuring unit shoot images displayed by the panel to be measured simultaneously; the brightness measurement unit shoots and obtains a brightness measurement picture of a pixel of the panel to be measured, and the chroma measurement unit shoots and obtains a chroma measurement picture of the block level of the panel to be measured. In the embodiment, the brightness measuring unit comprises a high-resolution low-noise black-and-white CCD/CMOS camera, a Y-Filter and a lens; the colorimetric measurement unit has various implementations, such as a color camera in combination with a lens, or a black and white camera in combination with a color filter wheel and a lens.
Referring to fig. 2, the flow of the method for detecting and repairing color spots by using the OLED color spot detection and repair integrated system provided by the embodiment is as follows:
(1) a pretreatment step;
(1.1) driving a panel to be detected to light up an initial evaluation picture, simultaneously shooting the panel to be detected by a brightness measurement unit and a chrominance measurement unit to obtain a brightness measurement picture and a chrominance measurement picture, and respectively converting the brightness measurement picture and the chrominance measurement picture into brightness and chrominance information at a pixel level by a calculation unit; the initial evaluation picture is a white picture with 1 or more different gray scales;
(1.2) carrying out Mura initial judgment according to the brightness and chroma information; sending the panel judged as good to other processes of the normal processing flow; processing the panel to be detected which is judged to need color spot repair in the step (1.3);
(1.3) judging the panel to be detected with the dead spots and the dead lines exceeding the set values as an abnormal product, and flowing the abnormal product into a rework station or a manual re-judgment station; and (3) transferring the panel to be detected with the dead pixel and the dead line within the set value to the step (2) for color spot compensation treatment.
In the embodiment, the preprocessing step further includes positioning and calibrating processes using a geometric positioning frame and a calibration frame such as a DotMirror as the preprocessing frame; the brightness measuring unit and the chroma measuring unit shoot a preprocessed picture displayed by a panel to be measured at the same time, R/G/B sub-pixels of the panel are accurately positioned according to the shot picture, the positioning needs a calculating unit to simultaneously carry out the pictures shot by the brightness measuring unit and the chroma measuring unit, and the brightness measuring unit and the chroma measuring unit can be positioned by adopting the same or different methods; the positioning method is a general technique and is not described in detail.
(2) A color spot compensation step;
driving a panel to be tested to light white pictures with different gray scales; each white picture is lighted on the panel to be measured, the display picture of the panel to be measured is shot by the brightness measuring unit and the chromaticity measuring unit at the same time, and the obtained brightness measuring picture and the chromaticity measuring picture are respectively converted into brightness and chromaticity data of each pixel by the calculating unit;
the number and the gray scale of the white pictures are preset according to the requirements of a Demura circuit function module of the panel to be tested; the gray levels can be set to 6-7 gray levels, and the gray levels are sequentially set to 16, 32, 64, 96, 128, 192 and 255 in the embodiment.
The conversion manner of the luminance measurement picture and the chromaticity measurement picture into luminance and chromaticity of each pixel by the calculation unit is as follows: this is by way of example only and not by way of limitation.
When the brightness measuring unit adopts a scheme of a black-white camera and a Y Filter Filter: under the condition that the aperture, the exposure time and the camera gain are fixed, the camera response and the actual brightness of the object to be measured have a determined one-to-one correspondence f 1. The method comprises the steps that a plurality of pixels of a camera correspond to one pixel of a panel to be detected, a calculating unit obtains the position corresponding relation between the camera pixel and the pixel of the panel to be detected in preprocessing, the response values of the camera pixel corresponding to each panel pixel are accumulated to obtain an average value, the average value is used as the relative measured brightness Brt2 of the panel pixel, f1 relation mapping is carried out on Brt2, and the actual brightness Brt1 is obtained. The pixel brightness of each gray level can be obtained in the above manner.
When the brightness measuring unit employs a color camera: under the condition that the aperture, the exposure time and the camera gain are fixed, the camera Response (RGB) has a determined corresponding relation f2 with the actual brightness of the object to be measured. A plurality of pixels of the camera correspond to one pixel of the panel to be measured, the computing unit acquires the position corresponding relation from the camera pixel to the pixel of the panel to be measured in the preprocessing, and the camera pixel response values corresponding to each panel pixel are accumulated to calculate the average value, so that the measurement value (RGB) measure is obtained.
According to the known relationship of the (RGB) of the camera itself to the brightness Brt, Brtmeasure is obtained.
Brt ═ d × R + e × G + f × B; wherein d, e and f are conversion coefficients of the camera; the camera's Brtmeasure has a certain one-to-one correspondence f2 with the actual brightness Brt. And f2 relational mapping is carried out on Breasure to obtain the actual brightness Brt.
When the chroma measurement unit adopts a scheme of a black and white camera and a color filter wheel: each white picture with different gray scales needs to be shot once by using a filter with the color R and a filter with the color B respectively, and finally converted into CIE1931 chromaticity values (X, Y and Z) of each point of the camera.
When the colorimetric measurement unit adopts the scheme of a color camera: each white card surface with different gray scales is shot once, an RGB color image is obtained, and the color image is finally converted into CIE1931 chromaticity values (X, Y and Z) of each point of the camera.
(3) The computing unit computes compensation data according to the brightness and chrominance data of each gray scale and converts the compensation data into a format required by a driving chip of the panel to be tested;
the method of obtaining compensation data from luminance and chrominance data obtained from a white picture is as follows: this is by way of example only and not by way of limitation.
The OLED color spot detection and restoration integrated system acquires the brightness and the chromaticity of a white picture under different gray scales; taking CIE1931 standard as an example, the brightness measurement submodule obtains a brightness matrix Lv formed by brightness data of each pixel under different gray scalesMatrixThe chroma measurement submodule acquires a color coordinate matrix (x) composed of color coordinates of blocks under different gray scalesMatix,yMatix)。
The input [ R, G, B ] of each point on the panel determines the visual effect [ Lv, x, y ] of human eyes, and Lv is not related to x and y independently. First converting the (Lv, X, Y) coordinates to (X, Y, Z);
Y＝Lv
X＝(Y/y)*x
Z＝(Y/y)*(1-x-y)
(R, G, B) and (X, Y, Z) are approximately in a linear transformation relationship, i.e.
Figure BDA0001632885220000091
The input values [ R, G, B ] of each (not less than 3) white gray-scale pictures are known]n, and has been measured to obtain [ X, Y, Z ] at these several gray levels]nFrom this, a coefficient matrix [ a, b, c; d, e, f; g, h, i]Specific values of (a). In compensation, the target luminance and chrominance [ X, Y, Z ]]destAccording to the actual specification parameters or specific acquisition of the panel, then
Figure BDA0001632885220000092
Subtracting the original input value from the target input value to obtain the compensation value [ Delta R, Delta G ]
Figure BDA0001632885220000101
In practice, [ R, G, B ] and [ X, Y, Z ] may not satisfy the linear relationship in the whole gray scale section, but the piecewise linear approximation is linear, so that better compensation effect can be obtained by piecewise linear approximation, such as 0-16, 16-64, 64-128, 128-255.
(4) Sending the data after format conversion to a memory of a panel to be tested, such as Flash or Ram; the writing mode includes MIPI channel writing and external SPI channel writing, which is not described herein for general technologies at present.
(5) Enabling a color spot repairing function to call the stored data to repair the color spots after the panel to be tested is electrified; shooting an evaluation picture, and evaluating the Mura grade;
the evaluation picture can adopt 1 or a plurality of white pictures with different gray scales, the panel is shot by the brightness measuring unit and the chroma measuring unit at the same time, and the shot picture is converted into the brightness and chroma information of the pixel level by the calculating unit; then, carrying out Mura evaluation and classification according to the brightness and chromaticity information, judging the standard product if the evaluation reaches the standard, and sending the standard product to other processes of a normal processing flow; judging that the panel which is not up to standard in evaluation is an abnormal product if the defective pixel and the defective line of the panel exceed the set values, and enabling the abnormal product to flow into a rework station or a manual re-judgment station; and (5) if the dead pixel and the dead line are within the set value, the dead pixel and the dead line are transferred to the step (2) to carry out the color spot compensation treatment again.
According to the OLED color spot detection and repair integrated system and method provided by the embodiment, the brightness is extracted without independently shooting three gray scales with different colors of R \ G \ B for compensation, and only a white picture is processed, so that the test period can be greatly shortened, and the test efficiency is improved; the brightness measurement is carried out on the white picture, and the current limit of the white picture is already carried out during measurement, so the compensation data can eliminate the influence of the current limit, the brightness of the white picture is more uniform compared with other compensation methods, and the color cast Mura can be compensated.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (7)

1. An OLED color spot detection and repair integrated system is characterized by comprising a calculation unit, an optical measurement unit and a driving unit;
the driving unit acts on the OLED panel to drive the OLED panel to light white pictures with different gray scales; the optical measurement unit is used for shooting a pixel brightness measurement picture of the OLED panel under the white picture and a block level chromaticity measurement picture under the trigger of the driving unit;
the computing unit is used for obtaining the brightness and the chroma of each pixel according to the brightness measurement picture and the chroma measurement picture and determining the color spot type and grade according to the brightness and the chroma of the pixel; and the compensation data of each channel of R/G/B is calculated according to the brightness and the chromaticity of each gray scale, converted into a format which can be received by a driving chip of the OLED panel and sent to a memory of the panel;
under the control of a demura enable state register of the OLED panel to be repaired, the compensation data in the memory is called to repair color spots;
the optical measurement unit shoots a pixel brightness measurement picture and a chromaticity measurement picture of the OLED panel under a preprocessing picture under the trigger of the driving unit, and the calculation unit judges whether the OLED panel needs to carry out color spot repair according to the pixel brightness measurement picture and the chromaticity measurement picture.
2. The integrated system for detecting and repairing OLED color spots according to claim 1, further comprising an auxiliary environmental position control unit, wherein the environmental position control unit comprises a darkroom, a dust removing device, a panel alignment mechanism, and a light path adjusting mechanism;
the darkroom is used for accommodating the OLED panel and the optical measuring unit so as to eliminate the influence of external light on measurement;
the dust removing device is positioned in the darkroom and is used for removing dust in the environment;
the panel alignment mechanism is used for adjusting the position of the OLED panel to be measured, so that the center of the OLED panel to be measured is positioned on the optical axis of the optical path and the plane of the OLED panel is parallel to the camera plane of the optical measurement unit;
the optical path adjusting mechanism is connected with the optical measuring unit and used for adjusting the distance between a camera of the optical measuring unit and the OLED panel to be measured, the size of the aperture of the camera and the position of the focusing ring.
3. The integrated OLED stain detection and repair system of claim 1 or 2, wherein the optical measurement unit comprises a luminance measurement unit and a chrominance measurement unit in parallel; when the device works, the brightness measuring unit and the chromaticity measuring unit shoot images displayed by the OLED panel at the same time, the brightness measuring unit shoots and obtains a brightness measuring picture of pixels of the OLED panel, and the chromaticity measuring unit shoots and obtains a chromaticity measuring picture of a block level of the panel to be measured.
4. The OLED color spot detection and repair method based on the OLED color spot detection and repair integrated system, which is characterized by comprising the following steps:
(1) taking a luminance measurement picture and a chrominance measurement picture under an initial evaluation picture displayed by the OLED panel and obtaining luminance and chrominance data therefrom; carrying out Mura initial judgment on the panel to be detected according to the brightness and chromaticity data, screening out the OLED panel needing color spot repair, and carrying out the treatment of the step (2);
(2) the method comprises the steps that the OLED panel to be repaired is driven to light white pictures with different gray scales, each white picture is lighted on the OLED panel to be repaired, a picture displayed by the OLED panel to be repaired is shot by a brightness measuring unit and a chromaticity measuring unit at the same time, and a brightness measuring picture and a chromaticity measuring picture which are obtained through shooting are respectively converted into brightness data and chromaticity data of each pixel;
(3) calculating compensation data according to the brightness and chromaticity data of each gray scale, converting the compensation data into a format required by a driving chip of the OLED panel to be repaired, and sending the compensation data into a memory of the OLED panel to be repaired;
(4) and under the control of the demura enable state register, calling the compensation data in the memory to repair the color spots of the OLED panel to be repaired.
5. The OLED stain detection and repair method of claim 4, further comprising the steps of:
(5) and shooting an evaluation picture displayed by the OLED panel after the color spot repair is enabled, and calculating and acquiring a JND value or a Semu value according to the shot evaluation picture to obtain the color spot evaluation grade of the OLED panel after the repair.
6. The OLED stain detection and repair method of claim 4, wherein said step (1) comprises the substeps of:
(1.1) driving an OLED panel to light an initial evaluation picture, simultaneously shooting the OLED panel by a brightness measurement unit and a chrominance measurement unit to obtain a brightness measurement picture and a chrominance measurement picture, and respectively converting the brightness measurement picture and the chrominance measurement picture into brightness and chrominance data at a pixel level by a calculation unit; the initial evaluation picture is a white picture with 1 or more different gray scales;
(1.3) carrying out Mura initial judging on the OLED panel according to the brightness and chromaticity data, and sending the OLED panel judged to be good into other processes of a normal processing flow; the OLED panel which is judged to need color spot repair enters the processing of the step (1.3);
(1.3) judging the OLED panel with the defective points and the defective lines exceeding the set values as an abnormal product, and enabling the abnormal product to flow into a rework station or a manual re-judgment station; and (4) transferring the OLED panel with the dead pixel and the dead line within the set value to the step (2) for processing.
7. The method for detecting and repairing OLED color spots according to claim 4, wherein in step (3), the number of white frames and the gray scale of the frames are preset according to the requirements of the Demura circuit function module of the OLED panel.
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