OLED Display Panel Sub-Pixel Compensation Method
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Solution Overview
Problem
Current OLED display panels suffer from brightness inconsistency due to varying electrical characteristics of drive transistors, leading to bright-dark connection dot defects, which affect manufacturing yield and require costly repair.
Innovation Solution
A compensation method and device that acquire position information of abnormal sub-pixels, set compensation parameters for adjacent sub-pixels of the same color, and perform laser repair to ensure consistent brightness across the display panel, thereby preventing bright or dark dot defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple sub-pixels share a set of detection and compensation circuits to reduce circuit density, then device complexity is reduced, but when a sub-pixel is defective it affects the detection of surrounding sub-pixels sharing the same circuit, causing bright-dark connection dot defects and reducing manufacturing precision
Solution Approach 1:
The patent segments the detection and compensation process by introducing a defect detection step that identifies abnormal sub-pixels before the compensation process. This segmentation allows the system to handle defective sub-pixels separately, preventing their defects from propagating to adjacent sub-pixels through the shared compensation circuit, thus maintaining brightness consistency while preserving circuit density reduction
Solution Approach 2:
The patent performs preliminary defect detection and identification before executing the compensation process. By detecting abnormal sub-pixels in advance and excluding them from the compensation process, the system prevents the propagation of defects to adjacent sub-pixels, ensuring that only healthy sub-pixels receive compensation and maintaining overall display quality
2Reliability
If defective sub-pixels are compensated through laser repair, then the defect is corrected, but it wastes module repair and compensation capacity and affects manufacturing productivity
Solution Approach 1:
The patent performs preliminary defect detection and identification before the compensation process. By detecting and marking defective sub-pixels in advance, the system prevents unnecessary laser repair operations on sub-pixels that would not benefit from compensation, thereby improving manufacturing yield while ensuring that only genuinely repairable defects undergo laser repair
Solution Approach 2:
The patent implements a feedback mechanism where the defect detection results directly influence the compensation process. The compensation device receives feedback about which sub-pixels are defective and adjusts its operation accordingly, excluding defective sub-pixels from the compensation process and focusing resources on healthy sub-pixels, thus optimizing both quality and productivity
Data Source
AI summary
A compensation method of a display panel is provided and comprises: acquiring position information of a first sub-pixel; acquiring position information of a second sub-pixel located in the same pixel unit as the first sub-pixel when the position information of the first sub-pixel matches position information of an abnormal sub-pixel; acquiring position information of a third sub-pixel that is adjacent to the second sub-pixel and emits light of the same color; finally, setting a compensation parameter of the third sub-pixel as a compensation parameter of the second sub-pixel.