Pixel Driving Circuit Reset Unit Prevents Screen Flicker
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Solution Overview
Problem
Existing pixel driving circuits suffer from current leakage issues during the power-on stage, leading to abnormal activation of the drive transistor and screen flicker phenomena, which negatively impact the display effect of micro light-emitting diode display panels.
Innovation Solution
A pixel driving circuit comprising a reset unit, storage unit, initialization unit, threshold compensation unit, and data write unit is designed to prevent abnormal activation of the drive unit during power-on, utilizing a reset power supply and initialization voltage to ensure the drive unit remains off, and employing threshold compensation to stabilize the drive unit's potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pixel driving circuit is powered on without a reset mechanism, then the drive unit may be abnormally turned on due to current leakage, but adding a reset unit and reset power supply increases device complexity
Solution Approach 1:
The reset unit performs preliminary action by resetting the drive unit to an off-state before the normal operation sequence begins. The reset power supply provides a dedicated power source during the reset phase, ensuring the drive unit is properly initialized before data writing and light emission occur, preventing abnormal activation due to current leakage.
Solution Approach 2:
The power supply system is segmented into different power sources for different operational phases: reset power supply for the reset phase, first power supply for data writing, and second power supply for light emission. This segmentation allows independent control of power delivery during each stage, enabling reliable reset functionality without affecting normal operation.
2Reliability
If the drive unit is not properly initialized during power-on, then screen flicker occurs affecting display effect, but implementing thorough initialization increases the power-on time
Solution Approach 1:
The reset unit performs preliminary initialization action immediately when power is supplied, resetting the drive unit before any data writing or light emission occurs. This preliminary reset prevents abnormal activation and screen flicker without requiring extended initialization time, as the reset operation is executed efficiently in sequence with the power-on event.
Solution Approach 2:
The initialization process is integrated into the periodic operational sequence of the pixel driving circuit. The reset operation occurs at the beginning of each frame or scanning period, ensuring consistent initialization without adding significant delay. The timing is synchronized with the scanning signal and data writing phases, maintaining efficient operation while ensuring display quality.
Data Source
AI summary
Provided is a pixel driving circuit. The pixel driving circuit includes a reset unit, a storage unit, an initialization unit, a drive unit, a threshold compensation unit, and a data write unit. A first terminal of the reset unit is configured to input the signal output by a reset power supply. A second terminal of the reset unit is connected to the control terminal of the drive unit and configured to provide the reset power supply for the control terminal of the drive unit during a power-on period. During the power-on period of the pixel driving circuit, the reset unit provides the reset power supply for the drive unit and performs reset control on the drive unit, so that the drive unit is prevented from being abnormally turned on during a power-on stage, thereby avoiding a screen flicker phenomenon.