Variable Frequency Display Device Flicker Reduction
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Solution Overview
Problem
Display devices driven at variable frequencies face challenges in enhancing display quality while minimizing power consumption and reducing flicker, especially when frequency changes occur.
Innovation Solution
A display device configuration that includes a pixel connected to a first gate line, an emission control line, and a data line, with a gate driver outputting gate signals and emission control signals during specific periods, and a data driver outputting first and second data voltages to stabilize the light waveform across address scan and self-scan periods, allowing for stable operation at varying frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the display device is driven at variable frequencies to enhance driving efficiency and minimize power consumption, then power consumption is reduced, but display quality deteriorates due to flicker and unstable light waveforms
Solution Approach 1:
The frame period is segmented into multiple scan periods (first scan period, second scan period, third scan period) with different gate signal frequencies. This allows the display device to operate at variable frequencies while maintaining stable light waveforms within each segment, resolving the contradiction between power consumption reduction and display quality maintenance
Solution Approach 2:
The patent implements periodic scanning with alternating high-frequency and low-frequency gate signal periods. The first scan period uses a first frequency, the second scan period uses a second frequency, and the third scan period returns to the first frequency. This periodic action enables variable frequency driving while stabilizing the overall light waveform and reducing flicker
2Productivity
If the gate signal frequency is changed to vary the driving frequency, then driving efficiency is enhanced, but light waveform stability deteriorates causing flicker
Solution Approach 1:
Different regions of the frame period are assigned different gate signal frequencies tailored to local requirements. The first scan period uses a first frequency optimized for certain display regions, while the second scan period uses a second frequency for other regions, allowing frequency variation while maintaining local light waveform stability
Solution Approach 2:
The gate signal frequency is made dynamic rather than fixed, allowing it to change between scan periods based on driving requirements. The system dynamically switches between first frequency and second frequency across different scan periods, enhancing driving efficiency while maintaining overall light waveform stability through controlled variation
Data Source
AI summary
A display device includes a pixel connected to a first gate line, an emission control line, a bias gate line, and a data line. A gate driver is configured to supply a first gate signal to the first gate line in an address scan period and configured to supply a bias write gate signal to the bias gate line in a self-scan period. An emission driver is configured to supply an emission control signal in the address scan period and in a self-scan period. A data driver is configured to supply a first data voltage to the data line in the address scan period and configured to supply a second data voltage to the data line in the self-scan period. The second data voltage is set based on the first data voltage.