OLED Display Gamma Adjustment for APL-Driven Luminance Shifts
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Solution Overview
Problem
OLED display devices face issues with inconsistent gamma and luminance variation due to changes in average picture level (APL) percentages, particularly during picture-by-picture operations involving standard dynamic range (SDR) and high dynamic range (HDR) modes, leading to misrepresentation of colors.
Innovation Solution
A system and method are implemented to predict panel gamma and adjust input gamma by calculating APL percentages and maximum brightness levels, using scaler and timing controller components to ensure consistent gamma output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If APL percentage changes during picture-by-picture operations, then dynamic range adaptation is improved, but gamma consistency deteriorates
Solution Approach 1:
The patent implements dynamic gamma adjustment by continuously monitoring APL percentage changes and adapting the gamma curve in real-time during picture-by-picture operations. The system transitions from static gamma settings to dynamic gamma modulation based on actual luminance measurements, allowing the display to maintain gamma accuracy across varying APL conditions while supporting both SDR and HDR modes.
Solution Approach 2:
The patent changes the gamma parameter dynamically based on APL percentage measurements. By detecting APL variations and adjusting the gamma curve accordingly, the system maintains consistent color representation across different brightness levels and operating modes, resolving the contradiction between adaptability and precision.
2Use of energy by moving object
If luminance variation is allowed to occur, then power consumption efficiency is improved, but color accuracy deteriorates
Solution Approach 1:
The patent implements a feedback mechanism that continuously measures actual luminance output and uses this information to adjust gamma settings. By monitoring luminance variations caused by APL changes and feeding this data back to the gamma adjustment algorithm, the system maintains color accuracy while allowing luminance to vary according to content requirements, thus preserving power efficiency.
Solution Approach 2:
The patent applies preliminary gamma compensation based on predicted APL changes before they fully manifest. By anticipating luminance variations and pre-adjusting the gamma curve, the system prevents color accuracy degradation before it occurs, while still allowing natural luminance variation for power efficiency.
3Measurement precision
If gamma adjustment is implemented dynamically, then color representation accuracy is improved, but system complexity increases
Solution Approach 1:
The patent performs preliminary calculations of the required gamma adjustment based on measured APL percentage changes. By pre-computing the necessary gamma curve modifications before actual display output, the system achieves accurate color representation while minimizing real-time processing complexity. This advance preparation reduces the computational burden during critical display operations.
Data Source
AI summary
An information handling system determines an average picture level percentage of a previous frame and determines a brightness level of a current frame based on the average picture level percentage of the previous frame. The information handling system also determines a panel gray level based on the brightness level of the current frame.