Display Panel Pixel-Circuit Initialization for Flicker-Free Power-On
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display technologies using organic light-emitting diodes (OLEDs) suffer from power-on flickering due to unstable drive currents, which affect display performance.
Innovation Solution
A display panel design incorporating a pixel circuit with a drive module, a first reset module, and a compensation module, along with a peripheral drive circuit that implements a power-on stage with specific control signals and voltage phases to initialize and compensate the drive module, preventing flickering by releasing residual charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drive transistor in a pixel circuit provides drive current to an OLED, then the OLED emits light with self-illumination and fast response, but the OLED flickers during power-on due to unstable drive current
Solution Approach 1:
The patent applies preliminary action by implementing a power-on stage before the normal display stage. During this power-on stage, the reset signal is continuously enabled to initialize the pixel circuit and stabilize the drive current before normal operation begins. This preliminary initialization prevents the flickering that would otherwise occur during power-on by preparing the circuit in advance.
Solution Approach 2:
The patent applies dynamics by making the reset signal configuration dynamic rather than static. The reset signal is enabled during the power-on stage and then disabled during the normal display stage. This dynamic control allows the circuit to adapt to different operational phases, providing continuous reset during power-on to prevent flickering while avoiding unnecessary reset during stable operation.
2Reliability
If the reset signal is continuously enabled to prevent flickering, then power-on stability improves, but power consumption increases
Solution Approach 1:
The patent applies periodic action by dividing operation into distinct stages: a power-on stage where the reset signal is enabled, and a normal display stage where the reset signal is disabled. This periodic activation of the reset function provides stability when needed (during power-on) while minimizing power consumption during normal operation, avoiding continuous reset that would waste energy.
Solution Approach 2:
The patent uses preliminary action to concentrate the reset operation during the power-on stage before normal operation begins. By completing the initialization and stabilization work in advance during the power-on stage, the system achieves power-on stability without needing to maintain continuous reset activation, thereby reducing overall power consumption during the display stage.
3Speed
If residual charges are not discharged during power-on, then the circuit operates faster, but power-on flickering occurs due to unstable drive current
Solution Approach 1:
The patent applies preliminary action by implementing charge discharge operations during the power-on stage before normal display operation begins. The reset signal is enabled during this stage to facilitate complete discharge of residual charges from capacitive elements. By completing this charge discharge process in advance, the system ensures stable drive current for the upcoming display stage without compromising the speed of normal operation.
Solution Approach 2:
The patent applies dynamics by making the reset signal dynamic - enabled during the power-on stage to discharge residual charges and ensure stability, then disabled during the normal display stage to maintain fast operation. This dynamic control allows the system to achieve both fast power-on speed and display stability by adapting the reset function to the operational phase.
Data Source
AI summary
A display panel includes a light-emitting element, a pixel circuit, and a peripheral drive circuit. The pixel circuit includes a drive module, a first reset module, and a compensation module. The operation process includes a power-on stage and a display stage in sequence. The power-on stage includes a first phase and a second phase in sequence. For part of the frames of the power-on stage, the peripheral drive circuit provides a first control signal to a control terminal of the first reset module. The first reset module is turned on. The peripheral drive circuit provides a second control signal to a control terminal of the compensation module. The compensation module is turned on. In the second phase, the peripheral drive circuit provides a first power supply voltage to a first terminal and/or provides a second power supply voltage to a second terminal. Problems of power-on flickering are improved.