Pixel Circuit Black Frame Insertion for Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Self-luminous pixel circuits, such as 2T1C, 3T1C, 6T2C, and 7T1C, experience screen flickering due to varying light-emitting currents within a frame, causing noticeable brightness differences.
Innovation Solution
A pixel circuit design incorporating a light-emitting control module with black frame insertion pulses and light-emitting pulses, where the duty ratios and number/width of black frame insertion pulses are adjusted across different stages of a frame to stabilize light-emitting currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If black frame insertion pulses are inserted during the light-emitting stage, then brightness uniformity is improved, but light-emitting efficiency deteriorates
Solution Approach 1:
The patent applies periodic action by inserting black frame insertion pulses at specific periods during the light-emitting stage. These pulses are periodically introduced to compensate for gate leakage current effects, creating a rhythmic correction pattern that maintains brightness uniformity while minimizing disruption to the overall light-emitting process
Solution Approach 2:
The patent applies local quality by differentiating the treatment of different time periods within the light-emitting stage. The black frame insertion pulses are inserted with specific duty ratios during early light-emitting stages compared to late stages, allowing targeted compensation for leakage current effects at different points in the emission cycle without uniformly reducing efficiency throughout
2Stability of the object's composition
If duty ratio of black frame insertion pulses is increased, then brightness difference is reduced, but light-emitting duration is shortened
Solution Approach 1:
The patent applies dynamics by making the duty ratio of black frame insertion pulses variable rather than fixed. The duty ratio is dynamically adjusted based on the specific stage of light-emitting - higher during early stages when leakage current impact is greater, and lower during late stages - optimizing the balance between brightness uniformity and light-emitting duration
Data Source
AI summary
A pixel circuit, a display panel and a control method are disclosed. The pixel circuit includes a light-emitting device, a driving module, and a light-emitting control module. By inserting the corresponding number of black frame insertion pulses into the light-emitting control signal during the early light-emitting stage and the late light-emitting stage of one frame, the difference between the sum of the light-emitting currents in the early light-emitting stage of said frame and the sum of the light-emitting currents in the late light-emitting stage of said frame can be reduced, and the perceived brightness difference in one frame can be effectively reduced, so as to improve the screen flickers.