Frame-Adaptive Display Gate Voltage Control for Low-Frequency Flicker
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices experience flicker and increased power consumption due to rapid luminance changes during low-frequency driving, particularly when luminance differences between adjacent frames exceed a critical value.
Innovation Solution
A display device and driving method that adjust the gate high voltage based on luminance differences between frames, using a combination of refresh and skip frames, and varying the gate high voltage between first and second levels to manage luminance changes, thereby reducing flicker and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device operates at low frequency with skip frames to reduce power consumption, then energy efficiency improves, but luminance changes between adjacent frames cause flicker and image quality degradation
Solution Approach 1:
The gate high voltage is dynamically adjusted based on the frame type (refresh frame vs. skip frame) and luminance differences. The system switches between first gate high voltage for skip frames and second gate high voltage for refresh frames, adapting the voltage level to the operational context to prevent flicker while maintaining low power consumption
Solution Approach 2:
The emission signal voltage (gate high voltage) is changed based on the driving mode and luminance characteristics. By changing the voltage parameter from first gate high voltage to second gate high voltage depending on whether it's a skip frame or refresh frame, the system optimizes both power consumption and image quality stability
2Productivity
If the gate high voltage is maintained at a high level during low-frequency driving, then emission efficiency improves, but power consumption increases and flicker worsens during luminance transitions
Solution Approach 1:
The system applies periodic emission signals with varying voltage levels. During skip frames, the first gate high voltage is applied periodically to maintain emission efficiency. During refresh frames, the second gate high voltage (lower than first) is applied to reduce power consumption while minimizing luminance transition effects, creating a periodic pattern of high and low voltage application
3Reliability
If the gate high voltage is reduced to minimize flicker during luminance changes, then image quality improves, but emission efficiency and brightness output decrease
Solution Approach 1:
Different gate high voltage levels are applied to different temporal contexts (different frame types). The first gate high voltage is used for skip frames where luminance stability is important, while the second gate high voltage is used for refresh frames where luminance transitions occur. This localized voltage adjustment optimizes flicker minimization without uniformly reducing brightness across all conditions
Data Source
AI summary
A display device including a display panel on which pixels are disposed, a timing controller configured to output image data and an emission driving control signal based on an image signal and a control signal that are output from an external component, a gate driver configured to apply a gate signal to the pixels, a data driver configured to apply a data voltage corresponding to the image data to the pixels, an emission driver configured to apply an emission signal to the pixels based on the emission driving control signal, and an emission signal voltage controller configured to change a voltage of the emission signal, and a method of driving the same.