Pixel Circuit Gate Initialization for Display Image Sticking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The image-sticking phenomenon in display panels, where residual images from previous frames affect the display quality due to incomplete reset of drive transistors, leading to inconsistent working states and reduced image clarity.
Innovation Solution
A pixel circuit structure incorporating a drive transistor, first and second light emission control modules, and a gate initialization module, where the first and second light emission control modules are controlled by different signals to ensure simultaneous initialization of the gate and source electrodes of the drive transistor, allowing for full reset and consistent working states across frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional pixel circuit is used, then the structure is simple, but the drive transistor cannot be fully reset causing image-sticking phenomenon
Solution Approach 1:
The light emission control function is segmented into two independent modules: the first light emission control module controls the source electrode, and the second light emission control module controls the drain electrode. This segmentation allows independent control and initialization of different parts of the drive transistor, enabling complete reset without requiring a complex overall circuit redesign.
Solution Approach 2:
The gate initialization module performs preliminary initialization of the gate electrode before the light emission stage. By initializing the gate electrode in advance through the gate initialization module, the drive transistor is prepared for complete reset, preventing image-sticking phenomenon before it occurs.
2Reliability
If the gate electrode is initialized alone, then the initialization is simple, but the source electrode remains in floating state causing incomplete reset
Solution Approach 1:
The initialization process is segmented into two parts: gate electrode initialization through the gate initialization module, and source electrode initialization through the first light emission control module. This segmentation ensures both electrodes are properly initialized without requiring overly complex integrated control.
Solution Approach 2:
The first light emission control module serves as an intermediary to initialize the source electrode. When activated, it connects the source electrode to a reference potential, effectively initializing it without requiring a dedicated source initialization module, thus simplifying the overall initialization control.
3Reliability
If different light emission control signals are used, then simultaneous initialization is achieved, but the control signal complexity increases
Solution Approach 1:
The control signals are segmented into distinct types: the first light emission control signal for the first module, the second light emission control signal for the second module, and the initialization control signal for the gate initialization module. This segmentation enables precise timing control for simultaneous initialization while keeping each signal's function clear and manageable.
Solution Approach 2:
The control signals operate in periodic cycles: during the initialization stage, the gate initialization module activates to reset the gate electrode; during the light emission stage, both light emission control modules activate to drive the display. This periodic action ensures consistent working states across frames while maintaining manageable signal complexity.
Data Source
AI summary
A pixel circuit, a display panel and a method for driving the pixel circuit. The pixel circuit includes a first light emission control module and a gate initialization module. The first light emission control module includes a control terminal, a first terminal and a second terminal, where the control terminal of the first light emission control module is electrically connected with a first light emission control signal, the first terminal of the first light emission control module is electrically connected with a first power signal, and the second terminal of the first light emission control module is electrically connected to the first electrode of the drive transistor.