Display Pixel Circuit Overlap for Low-Frequency Smear Reduction
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Solution Overview
Problem
Existing display panels experience a serious smear problem during low-frequency image switching, affecting the display effect.
Innovation Solution
A display panel design incorporating a pixel circuit with a drive module, reset module, and compensation module, where the reset module is turned on during a reset stage and the compensation module is turned on during a compensation stage, with a partial time period of the reset stage coinciding with a partial time period of the compensation stage to reset and compensate the threshold voltage of the drive transistor, thereby reducing bias voltage effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel circuit uses a conventional drive module without overlapping reset and compensation stages, then the circuit operation is simple, but the smear problem occurs during low-frequency image switching
Solution Approach 1:
The patent merges the reset stage and compensation stage by making their time periods partially coincide, allowing both operations to occur simultaneously rather than sequentially. This integration eliminates the smear problem by ensuring both reset and compensation functions are performed during the same time window, improving display quality without proportionally increasing circuit complexity
Solution Approach 2:
The compensation operation is performed in advance during the compensation stage, which partially overlaps with the reset stage. By completing the threshold voltage compensation before the drive transistor fully operates, the circuit prevents smear artifacts from forming in the first place, maintaining high display quality
2Reliability
If the reset stage and compensation stage are performed sequentially without overlap, then the timing control is simple, but the smear problem affects image switching
Solution Approach 1:
The patent combines the reset stage and compensation stage into an overlapping time period, allowing both operations to proceed simultaneously. This merging approach eliminates the smear problem during image switching while actually reducing the total operation time compared to sequential execution, as both functions are performed in parallel rather than one after the other
Solution Approach 2:
By making the reset and compensation stages overlap, the patent ensures continuous useful action throughout the pixel circuit operation. Both reset and compensation functions are performed without idle time between them, eliminating the smear problem and optimizing the use of available time resources
Data Source
AI summary
A display panel includes a pixel circuit including a drive module, a reset module, and a compensation module, a first terminal of the drive module is coupled to the light-emitting element to provide a drive current for the light-emitting element, and the drive module includes a drive transistor; the reset module is connected between a reset signal terminal and a control terminal of the drive module to provide a reset signal for the drive module; and the compensation module is connected between the control terminal of the drive module and the first terminal of the drive module to compensate a threshold voltage of the drive transistor; in the reset stage, the reset module is turned on; in the compensation stage, the compensation module is turned on; and a partial time period of the reset stage coincides with a partial time period of the compensation stage.