Pixel Circuit Initialization for Display Residual Shadow Reduction
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Solution Overview
Problem
Existing display panels suffer from short-term residual shadows due to differences in drive current magnitudes when transitioning between different gray scales, leading to inconsistent brightness and poor display effects.
Innovation Solution
A pixel circuit design that includes a data-writing module, drive module, storage module, light emission control modules, and initialization modules, where the initialization module fixes the potential of the drive module's terminals, ensuring all drive transistors have the same working state, thus maintaining consistent drive current and brightness across gray scales.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If drive transistors operate with different working states when transitioning between gray scales, then the display panel can achieve gray scale variation, but residual shadows occur due to inconsistent drive current magnitudes
Solution Approach 1:
The patent applies preliminary action by introducing an initialization stage before the display stage, where the initialization module pre-charges the gate electrode and source electrode of drive transistors to uniform potentials. This preliminary charging ensures that when gray scale transitions occur, all drive transistors start from the same working state, preventing residual shadow effects while maintaining gray scale adaptability.
2Object-generated harmful factors
If drive transistors are initialized to the same potential, then residual shadows are reduced, but additional initialization circuits and control stages are required
Solution Approach 1:
The patent applies universality by designing the initialization module to serve multiple functions: it initializes both the gate electrode and source electrode of drive transistors, and it operates across all pixel circuits uniformly. The same initialization circuit structure is reused throughout the display panel, reducing overall complexity despite the added functionality. The initialization module shares control signals with other pixel circuit components, further minimizing additional complexity.
Data Source
AI summary
The pixel circuit includes a data-writing module, a drive module, a storage module, a first light emission control module, a second light emission control module, a light-emitting module and a first initialization module. A first terminal of the first initialization module is electrically connected to a second light emission control signal input terminal, a second terminal of the first initialization module is electrically connected to a control terminal of the drive module; or the pixel circuit includes an initialization voltage input terminal, the first terminal of the first initialization module is electrically connected to the initialization voltage input terminal, the second terminal of the first initialization module is electrically connected to the control terminal of the drive module. The first initialization module is configured to initialize the control terminal of the drive module under a control of a control signal input into a control terminal of the first initialization module.