Display Gamma Curves for Flicker-Free Refresh Transitions
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Solution Overview
Problem
Display panels operating at multiple refresh rates experience visual flicker due to differences in luminance and color between refresh rates, particularly noticeable under varying ambient light conditions, which degrades user experience.
Innovation Solution
Measure optical properties at different refresh rates and ambient brightness levels to determine a compensation factor, modify gamma values to maintain consistent delta differences, and store these values for adjusting input display data during transitions between refresh rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display panel operates at multiple refresh rates to improve user experience and reduce power consumption, then energy efficiency and adaptability are improved, but visual flicker and optical defects occur due to luminance differences between refresh rates
Solution Approach 1:
The patent modifies gamma values as a parameter to adjust the luminance output characteristics of the display panel at different refresh rates. By changing the gamma curve parameters, the system compensates for luminance differences between 60Hz and 90Hz operation, reducing visual flicker while maintaining energy efficiency benefits of variable refresh rates
Solution Approach 2:
The system measures optical properties (luminance, color) at different refresh rates and uses these measurements to determine compensation factors. This feedback loop allows the system to automatically adjust gamma values based on actual display performance, eliminating visual flicker while preserving the energy-saving benefits of multiple refresh rate operation
2Stability of the object's composition
If gamma values are modified to reduce perceived optical defects, then image quality consistency is improved, but additional processing and calibration complexity is introduced
Solution Approach 1:
The patent performs gamma value modification and calibration in advance during manufacturing or initial setup. The compensation factors and modified gamma values are predetermined and stored in the device, so that during normal operation at different refresh rates, the system simply applies pre-calculated corrections without requiring real-time complex processing, thus reducing operational complexity while maintaining luminance consistency
Data Source
AI summary
A method involves measuring, for an optical property of the display panel for an input gray level and at a first refresh rate, first and second values at respective first and second ambient brightness levels. The method also involves determining a compensation factor for the input gray level at the first refresh rate. The method further involves determining a modified gamma value at a second refresh rate, wherein the modified gamma value reduces a perceived optical defect of the display panel when operating at the second refresh rate by maintaining a consistent delta difference in values for the optical property between the first and second refresh rates at different ambient brightness levels. The method additionally involves storing the modified gamma value, where the device is configured to adjust input display data using the modified gamma value when transitioning from the first refresh rate to the second refresh rate.