Display Panel Reset-Voltage Control for Flicker-Free Power-On
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Solution Overview
Problem
Display devices experience screen flickering during the power-on stage due to instantaneous fluctuations in power signals, affecting the display effect.
Innovation Solution
The display device incorporates a power management circuit and a display driving circuit in the non-display area, controlling the voltage difference between reset and power signals to ensure it is less than the turn-on voltage of the light-emitting elements, preventing light emission during the power-on stage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power circuit provides power signals to the display panel during power-on, then the display panel can be initialized, but the power signals fluctuate and cause screen flickering
Solution Approach 1:
The patent applies preliminary anti-action by pre-controlling the voltage difference between reset and power signals during the power-on stage. The display driving circuit adjusts the reset signal voltage to ensure that the voltage difference between the reset signal and power signal remains below the turn-on voltage threshold of light-emitting elements, preventing unintended light emission and screen flickering before normal display operation begins.
2Illumination intensity
If the driving circuit provides driving signals for 0-grayscale image, then the display panel displays black image, but power signal fluctuations cause the display device to flash
Solution Approach 1:
The patent introduces an intermediary control mechanism where the display driving circuit mediates between the power circuit and the light-emitting elements. By controlling the reset signal voltage to maintain a voltage difference below the turn-on threshold with respect to power signals, the driving circuit acts as an intermediary that prevents power signal fluctuations from directly affecting light emission, thereby ensuring display consistency during power-on.
3Illumination intensity
If the voltage difference between reset signal and power signal exceeds turn-on voltage, then light-emitting elements emit light, but this causes screen flickering during power-on
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the voltage level of the reset signal during the power-on stage. The display driving circuit modifies the reset signal voltage parameter to ensure that the voltage difference between reset and power signals remains below the turn-on voltage threshold of light-emitting elements, preventing unintended light emission and ensuring stable power-on behavior.
Data Source
AI summary
A display device includes display panel, power management circuit, and display driving circuit. The display panel includes display area and non-display area at least partially surrounding the display area. The display area provided with multiple pixels arranged in array. A pixel at least includes light-emitting element and reset module electrically connected to first electrode of the light-emitting element. The power management circuit disposed in the non-display area and at least configured to provide first power signal to second electrode of the light-emitting element. The display driving circuit disposed in the non-display area and at least configured to provide reset signal to the reset module. The working process of the display device at least includes power-on stage in which, difference between the voltage of the reset signal and the voltage of the first power signal is ΔVb, and the turn-on voltage of the light-emitting element is V0, where |ΔVb|<V0.