Pixel Circuit Reset Segmentation for Low-Refresh Flicker Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of simultaneously improving flicker phenomenon at low refresh frequency and display uniformity at low gray scale in pixel circuits is unresolved, as increasing reset frequency deteriorates display quality.
Innovation Solution
A pixel circuit design with separate control of transistors to reset the driving transistor more frequently than the light-emitting device, reducing repetitive charging and improving threshold voltage drift, thereby enhancing flicker reduction and display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reset frequency is increased to improve flicker phenomenon at low refresh frequency, then the flicker phenomenon is reduced, but display uniformity at low gray scale is deteriorated
Solution Approach 1:
The patent divides the reset operation into two separate segments: one for the driving transistor (first reset transistor) and one for the light-emitting device anode (second reset transistor). This segmentation allows independent control of reset frequencies for each component, enabling the driving transistor to be reset frequently to reduce flicker while the light-emitting device anode is reset less frequently to maintain display uniformity at low gray scales.
Solution Approach 2:
The patent implements dynamic control where the reset frequency of the driving transistor is made higher than the reset frequency of the light-emitting device anode. This dynamic differentiation in reset frequencies allows the system to adaptively address flicker issues in the driving transistor without causing the display uniformity problems that would result from equally frequent resets of the light-emitting device.
2Stability of the object's composition
If the reset frequency of the light-emitting device anode is increased to improve threshold voltage stability, then the threshold voltage drift is reduced, but the display uniformity at low gray scale is deteriorated due to excessive repetitive charging
Solution Approach 1:
The patent applies partial action by providing threshold voltage stability for the driving transistor through frequent resets, while avoiding excessive action on the light-emitting device anode by resetting it less frequently. This prevents the excessive repetitive charging that would otherwise deteriorate display uniformity at low gray scales, while still achieving the necessary threshold voltage stability where needed.
Data Source
AI summary
A pixel circuit includes a first light-emitting control transistor, a driving transistor, a second light-emitting control transistor, and a light-emitting device. The number of times a source or a drain of the driving transistor is reset in one frame is configured to be larger than the number of times the anode of the light-emitting device is reset in the one frame.