CN110570817A - AMOLED pixel uniformity compensation method - Google Patents
AMOLED pixel uniformity compensation method Download PDFInfo
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- CN110570817A CN110570817A CN201910880008.4A CN201910880008A CN110570817A CN 110570817 A CN110570817 A CN 110570817A CN 201910880008 A CN201910880008 A CN 201910880008A CN 110570817 A CN110570817 A CN 110570817A
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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
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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
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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)
- Electroluminescent Light Sources (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The invention discloses an AMOLED pixel uniformity compensation method. It comprises the following steps: A. measuring brightness and color of an image using a color measuring device, and storing color information of the measured image in an external flash memory; B. reading an external flash memory from a display driver IC and storing the external flash memory in a static random access memory inside the display driver IC, the display driver IC driving the OLED panel when the terminal device is started; C. the color information stored in the internal static random access memory of the display drive IC is used to compensate the input actual image information. The advantages are that: the flash memory capacity and the internal static random access memory capacity of the display drive IC are reduced, a plurality of sub-pixels are combined together to perform synchronous storage processing, input display data are calculated through Mura data stored in the SRAM, and the output is used as compensation display data, so that the processing effect is good, the problem of uneven brightness of a display is solved, and the yield of the drive IC for driving the OLED panel is improved.
Description
Technical Field
The invention relates to an OLED pixel compensation technology, in particular to an AMOLED pixel uniformity compensation method.
Background
Organic Light Emitting Diodes (OLEDs) have become the most popular technology in the flat panel display market; this technology is popular because OLED displays provide better display quality for smart phones and large televisions at a lower cost than conventional display technologies such as LCD; the OLED provides better contrast and clearer picture quality, has better black and clearer colors, does not require a backlight because it can emit light by itself, and thus consumes less power, is thinner and thinner, and in addition, provides a very fast response speed, providing excellent image quality in a video image that requires fast movement.
although OLED manufacturers are launching commercially available OLED-based products, yield loss during manufacturing is a problem for large-scale commercialization of OLEDs, one of the biggest problems being the Mura phenomenon (phenomenon in which display brightness is not uniform, causing various traces) caused by mismatch between devices in the OLED panel manufacturing process. The Mura phenomenon is caused by the inconsistency of the current-voltage characteristics (IV characteristics) of the OLED pixels, so how to solve the problem of uneven brightness of the display is a key to improve the yield of the OLED pixels.
Disclosure of Invention
the invention aims to solve the technical problem of providing an AMOLED pixel uniformity compensation method which can improve the problem of uneven brightness of a display and improve the yield of a driving IC for driving an OLED panel.
in order to solve the technical problem, the method for compensating the uniformity of the AMOLED pixels comprises the following steps:
A. Measuring brightness and color of an image using a color measuring device, and storing color information of the measured image in an external flash memory;
B. Reading an external flash memory from a display driver IC and storing the external flash memory into a static random access memory inside the display driver IC, wherein the display driver IC drives an OLED panel when a terminal device is started;
C. the color information stored in the internal static random access memory of the display drive IC is used to compensate the input actual image information.
In the step a, the brightness and color of each sub-pixel on the OLED display panel are measured in the image brightness measurement process, and the gain and offset of each sub-pixel are calculated.
And B, in the information processing process of the display drive IC, reading the external flash memory, storing the external flash memory in the static random access memory, then performing brightness compensation adjustment on the display and outputting corresponding gray scale.
the color measuring device is a colorimeter.
the terminal equipment is a smart phone or a display screen.
the invention has the advantages that: combining a plurality of sub-pixels together and storing a measurement information in a flash memory reduces the capacity of the flash memory and the capacity of an internal static random access memory of a display driver IC (block unit measurement), and at the same time, performing a synchronous storage process by combining a plurality of sub-pixels together, calculating input display data (pixel data) from Mura data stored in an SRAM, and outputting the input display data as compensation display data, so that the processing effect is good, the problem of non-uniformity of display luminance is improved, and the yield of the driver IC driving an OLED panel is improved.
Drawings
FIG. 1 is a flow chart of an AMOLED pixel uniformity compensation method according to the present invention;
FIG. 2 is a diagram showing an image before compensation;
FIG. 3 is a diagram of a compensated image display;
FIG. 4 is a schematic diagram of an AMOLED pixel uniformity compensation method according to the present invention.
FIG. 5 is an example of a block element, an 8x8 pixel element, in a panel having an RGBG type pixel structure;
FIG. 6 is an example of a block element, a 4x8 pixel element, in a panel having an RGBG type pixel structure;
Fig. 7 is an example of a block unit in a panel having an RGB type pixel structure, 8 × 8 pixels.
Detailed Description
The AMOLED pixel uniformity compensation method of the present invention will be described in further detail with reference to the accompanying drawings and the detailed description.
as shown in the figure, the AMOLED pixel uniformity compensation method of the present invention includes the following steps:
A. Measuring the brightness and color of an image by using a color difference meter, storing the color information of the measured image in an external flash memory, measuring the brightness and color of each sub-pixel on an OLED display panel in the image brightness measuring process, and calculating the gain and offset of each sub-pixel; the Mura information measurement by the color measurement device can be performed by taking 1 sub-pixel (R, G or B pixel) as a unit, but a high-capacity flash memory is needed in a display panel with higher resolution, and an internal SRAM of a display drive IC also needs high capacity, which becomes a factor of price increase of display devices such as smart phones and televisions;
B. Reading an external flash memory from a display drive IC, storing the external flash memory into a static random access memory inside the display drive IC, driving an OLED panel by the display drive IC when display equipment such as a smart phone, a television and the like is started, and in the information processing process of the display drive IC, reading the external flash memory, storing the external flash memory into the static random access memory, then performing display brightness compensation adjustment and outputting corresponding gray scale;
C. the color information stored in the internal static random access memory of the display drive IC is used to compensate the input actual image information.
In addition, the block unit for obtaining Mura information by measuring pixels may be in various forms, such as 3x3, 3x4, 4x4, 8x8, 16x16, which may also be applied to two pixel structures having RGB and RGBG (and possibly GRGB) forms, the block unit should consider the capacity of flash memory and the internal SRAM capacity of DDI, and may be block unit information including R, G and B, or may be single block information of R, G or B sub-pixels, and fig. 7 shows an example of the block unit for Mura data detection.
Claims (5)
1. An AMOLED pixel uniformity compensation method comprises the following steps:
A. measuring brightness and color of an image using a color measuring device, and storing color information of the measured image in an external flash memory;
B. Reading an external flash memory from a display driver IC and storing the external flash memory into a static random access memory inside the display driver IC, wherein the display driver IC drives an OLED panel when a terminal device is started;
C. the color information stored in the internal static random access memory of the display drive IC is used to compensate the input actual image information.
2. the AMOLED pixel uniformity compensation method of claim 1, wherein: in the step a, the brightness and color of each sub-pixel on the OLED display panel are measured in the image brightness measurement process, and the gain and offset of each sub-pixel are calculated.
3. The AMOLED pixel uniformity compensation method of claim 1 or 2, wherein: and B, in the information processing process of the display drive IC, reading the external flash memory, storing the external flash memory in the static random access memory, then performing brightness compensation adjustment on the display and outputting corresponding gray scale.
4. The AMOLED pixel uniformity compensation method of claim 3, wherein: the color measuring device is a colorimeter.
5. An AMOLED pixel uniformity compensation method as claimed in claim 1, 2 or 4, wherein: the terminal equipment is a smart phone or a display screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910880008.4A CN110570817A (en) | 2019-09-18 | 2019-09-18 | AMOLED pixel uniformity compensation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910880008.4A CN110570817A (en) | 2019-09-18 | 2019-09-18 | AMOLED pixel uniformity compensation method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111883054A (en) * | 2020-07-28 | 2020-11-03 | 华兴源创(成都)科技有限公司 | Compensation method and compensation device of display panel |
| CN113674719A (en) * | 2021-08-17 | 2021-11-19 | 晟合微电子(肇庆)有限公司 | Mura compensation information generation method, device, equipment, medium and Mura compensation method |
| CN113674687A (en) * | 2021-08-17 | 2021-11-19 | 晟合微电子(肇庆)有限公司 | Display driving method |
| CN114765015A (en) * | 2021-01-13 | 2022-07-19 | 敦泰电子股份有限公司 | Display driving circuit system |
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| CN110148375A (en) * | 2019-06-28 | 2019-08-20 | 云谷（固安）科技有限公司 | The mura compensation method of display panel and device |
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| CN102231251A (en) * | 2011-06-21 | 2011-11-02 | 华南理工大学 | Camera photo-based method for point-by-point inhomogeneous analysis and correction of LED (Light Emitting Diode) |
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| CN111883054A (en) * | 2020-07-28 | 2020-11-03 | 华兴源创(成都)科技有限公司 | Compensation method and compensation device of display panel |
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Address after: 526070 Room 127, Building B, Zhaoqing Investment Development Co., Ltd., North Eight District, Guicheng New Town, Dinghu District, Zhaoqing City, Guangdong Province Applicant after: Guangdong Shenghe Microelectronics Co., Ltd Address before: 526070 Room 127, Building B, Zhaoqing Investment Development Co., Ltd., North Eight District, Guicheng New Town, Dinghu District, Zhaoqing City, Guangdong Province Applicant before: Guangdong Shenghe Technology Co.,Ltd. |
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Application publication date: 20191213 |