Display Module Reset Circuit for Low-Frequency Flicker Reduction
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Solution Overview
Problem
When a display panel is driven at a low frequency, the threshold voltage shift of the first transistor under long-term bias action causes a change in the current flowing through the light-emitting device, exacerbating the flicker problem.
Innovation Solution
A display module with a reset module that outputs a first reset signal during a blanking interval, allowing bias signals to be applied to the first transistors through the second transistors, ensuring all first transistors are turned on simultaneously to mitigate the threshold voltage shift and flicker issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the display panel is driven at a low frequency, then power consumption is reduced, but the threshold voltage shift of the first transistor causes current change and aggravates flicker
Solution Approach 1:
The patent applies preliminary action by resetting the threshold voltage of the first transistor during the blanking interval before the next frame is displayed. The reset module detects threshold voltage shift and applies a reset signal to restore the transistor's threshold voltage to its initial value, preventing current variation and flicker before they occur during low-frequency operation
Solution Approach 2:
The patent implements feedback by using the reset module to continuously monitor the threshold voltage of the first transistor and dynamically adjust the reset signal accordingly. The reset module detects the threshold voltage shift and applies corrective reset signals to maintain stable current flow through the light-emitting device, creating a closed-loop control system that eliminates flicker while preserving low-power operation
2Duration of action of moving object
If the first transistor is subjected to long-term bias action, then the display can maintain low-frequency operation, but threshold voltage shift occurs causing current instability
Solution Approach 1:
The reset module performs preliminary action by resetting the first transistor's threshold voltage during the blanking interval before the transistor is subjected to bias action in the next frame. This preventive reset eliminates accumulated threshold voltage shift from long-term bias operation, maintaining current stability over extended low-frequency operation periods
Solution Approach 2:
The patent applies periodic action by resetting the threshold voltage at regular intervals during each blanking interval. The reset module periodically restores the first transistor's threshold voltage to its initial value, preventing cumulative drift that would otherwise occur during prolonged low-frequency operation, thereby maintaining current stability
Data Source
AI summary
A display module and a display device are provided. A plurality of first scanning lines are electrically connected to a plurality of first gate driving circuits, a plurality of pixel driving circuits, and a reset module. The reset module outputs a first reset signal within a blanking interval, so that the plurality of bias signals transmitted by the plurality of data lines are applied to the plurality of first transistors through the second transistors in the plurality of pixel driving circuits. Therefore, the plurality of first transistors are turned on in the blanking interval at the same time to improve a flicker problem when the display module is driven at a low-frequency.