Display Panel Bias Voltage Switching for Low-Frequency Uniformity
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Solution Overview
Problem
Conventional display panels suffer from poor display uniformity during low-frequency displaying, which affects the display effect.
Innovation Solution
A display panel with a pixel circuit that includes a dimming module, drive module, and bias module, featuring multiple working stages with different light emission durations and bias signal voltages to adjust the drive transistor's bias state, thereby alleviating threshold voltage offset and improving display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display panels are used for low-frequency displaying, then the display operation is simple, but the display uniformity is poor
Solution Approach 1:
The pixel circuit is divided into multiple functional modules: drive module (drive transistor), dimming module (first switching transistor), and bias module (second switching transistor). Each module performs a specific function, allowing independent optimization of bias adjustment without complicating the overall circuit operation.
Solution Approach 2:
The bias signal voltage is dynamically adjusted based on the light emission duration. When the light emission duration exceeds a threshold, a first bias signal voltage is applied; otherwise, a second bias signal voltage is applied. This parameter change compensates for threshold voltage offset and improves display uniformity.
2Adaptability or versatility
If the light emission duration is adjusted in different working stages, then the display adaptability is improved, but the control complexity increases
Solution Approach 1:
The bias adjustment is performed in advance during the non-light emission stage. The second switching transistor pre-adjusts the bias state of the drive transistor before the light emission stage begins, ensuring optimal performance without requiring complex real-time control during emission.
Solution Approach 2:
The circuit dynamically switches between different bias signal voltages based on the light emission duration. The control terminal of the second switching transistor receives control signals that determine whether to apply the first or second bias voltage, enabling adaptive optimization across different working stages.
Data Source
AI summary
Provided display panel includes: a pixel circuit and a light-emitting element. The pixel circuit includes a dimming module, a drive module providing drive current for the light-emitting element and including a drive transistor, and a bias module connected between bias signal terminal and first terminal of the drive transistor and configured to perform bias adjustment on the drive transistor. A control terminal of the bias module is connected to bias control terminal, and the bias signal terminal is provided with bias signal. The pixel circuit includes working stages including at least a first and a second working stage and a second working stage, a light emission duration of the light-emitting element in the first working stage is different from that in the second working stage, and a bias signal voltage provided by the bias signal terminal in the first working stage is different from that in the second working stage.