Pixel Driving Compensation Circuit for OLED Display Defect Isolation
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Solution Overview
Problem
Existing OLED displays face challenges in accurately compensating for pixel defects during the manufacturing process, which can lead to display abnormalities due to the interconnected nature of sub-pixels and limitations in current external compensation techniques.
Innovation Solution
A pixel driving compensation circuit and method that utilize switching sub-circuits and detection lines to isolate and individually compensate each sub-pixel by transmitting and reading driving currents through specific detection lines, using strobe signals to control the switching and reset operations, thereby preventing signal interference and improving detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external compensation techniques are used to detect driving current through detection circuits, then compensation can be achieved, but signal interference between sub-pixels occurs and detection accuracy decreases
Solution Approach 1:
The patent divides the detection process into separate time periods for different sub-pixels. The first detection line detects first and second sub-pixels in a first period, while the second detection line detects third and fourth sub-pixels in a second period. This temporal segmentation eliminates signal interference between sub-pixels during detection, improving measurement precision.
2Productivity
If detection is performed for all sub-pixels simultaneously, then detection coverage is complete, but detection time increases and display refresh rate decreases
Solution Approach 1:
The patent implements periodic detection by dividing sub-pixels into different detection groups that are detected in alternating periods. First sub-pixels are detected in a first period, then second sub-pixels are detected in a second period, and this pattern repeats. This periodic action reduces the time required for complete detection while maintaining comprehensive coverage, thereby improving display refresh rate.
3Reliability
If pixel defects occur during manufacturing, then display abnormalities occur, but external compensation techniques cannot accurately compensate due to interconnected sub-pixel detection
Solution Approach 1:
The patent segments sub-pixels into different detection groups with separate detection lines and time periods. This segmentation allows independent detection of each sub-pixel's driving current without interference from neighboring defective sub-pixels. By isolating the detection process, the system can accurately identify and compensate for pixel defects, improving both reliability and measurement precision.
Data Source
AI summary
The present disclosure relates to a pixel driving compensation circuit. The pixel driving compensation circuit can detect and compensate a driving current of a sub-pixel in a pixel unit. The pixel unit includes first, second, and third sub-pixels and the first to third sub-pixels respectively include first, second, and third driving transistors. The pixel driving compensation circuit includes a first switching sub-circuit configured to be turned on in a first period to transmit a driving current output from the first driving transistor to a first detection line, second switching sub-circuit configured to be turned on in a second period to transmit a driving current output from the second driving transistor to a first detection line, and a third switching sub-circuit configured to be turned on in the first period to transmit a driving current output from the third driving transistor to a second detection line.