Pixel Circuit Initialization for Stable Low-Frequency Driving
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Solution Overview
Problem
The potential of the source and/or drain of a driving transistor undergoes periodic changes when switching to low-frequency driving, leading to flickering in display panels.
Innovation Solution
A pixel circuit design incorporating a driving transistor, write-in transistor, light emission control transistors, and initialization transistors, with specific electrical connections and control signals to initialize the potential of the source and drain before and after charging phases, stabilizing the transistor potentials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If frequency switching from high-frequency to low-frequency driving is performed, then power consumption is reduced, but the potential of source and drain undergoes periodic changes causing flickering
Solution Approach 1:
The initialization transistor is configured to initialize the potential of the source or drain before the charging phase occurs. This preliminary initialization action ensures that the potential is reset to a stable state prior to any periodic changes during low-frequency driving, thereby preventing flickering while maintaining power savings
Solution Approach 2:
The circuit uses the gate potential of the driving transistor as feedback to control the initialization transistor. When the gate potential indicates that initialization is needed (before and after charging phases), the initialization transistor activates to reset the source/drain potential, creating a feedback mechanism that maintains stability during frequency switching
2Stability of the object's composition
If initialization transistor is added to stabilize potential, then flickering is reduced, but device complexity increases
Solution Approach 1:
The initialization transistor is designed to serve multiple functions: it initializes the source/drain potential before charging, maintains stability during low-frequency driving, and works cooperatively with existing circuit elements like the driving transistor and capacitor. This multi-functionality reduces the need for additional separate components
Solution Approach 2:
The initialization function is merged into the existing pixel circuit structure by integrating the initialization transistor with the driving transistor and capacitor. The initialization transistor shares control signals and electrical connections with other circuit elements, combining initialization functionality with the existing circuit architecture rather than adding a completely separate initialization system
Data Source
AI summary
A pixel circuit and a display panel. The pixel circuit includes a driving transistor, a write-in transistor, a first light emission control transistor, a second light emission control transistor, and a first initialization transistor. By initializing a potential of a source or a drain of the driving transistor at least once before and after a charging phase of a frame, the potential of the source or the drain of the driving transistor may be stabilized.