Foldable OLED Aging Compensation via Lookup Tables
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Solution Overview
Problem
Foldable OLED display screens exhibit significant color and brightness differences due to varying usage times across different display areas, leading to noticeable display effect disparities when unfolded, particularly between primary and secondary screens and bent screens.
Innovation Solution
A method for display screen aging compensation that involves obtaining decay ratios for each primary color based on usage time, temperature, and brightness data, using corrected aging formulas and lookup tables to adjust gray level values and brightness, ensuring consistent color and brightness across all display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If foldable OLED display screens are used with different display areas (primary screen, secondary screen, bent screen), then the display can be compact and flexible, but color and brightness differences occur due to varying usage times
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing lookup tables (LUTs) for aging compensation before the actual display operation. The system pre-determines the decay ratios for different display areas based on their respective usage times and stores these in lookup tables, which are then applied in real-time during display operation to maintain color and brightness consistency across all display areas.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the gray level values and brightness parameters for different display areas based on their aging characteristics. The system changes the display parameters (gray levels, brightness) according to the specific usage time and decay ratio of each display area, transforming the display output to compensate for aging differences and achieve uniform visual appearance.
2Manufacturing precision
If aging compensation is performed for each display area, then color and brightness consistency is improved, but the system complexity increases
Solution Approach 1:
The patent uses preliminary action by pre-computing aging compensation data and storing it in lookup tables. This pre-processing approach shifts the complexity to an offline stage, allowing the online display system to simply retrieve and apply pre-determined compensation values without complex real-time calculations, thus reducing operational system complexity.
Solution Approach 2:
The patent introduces lookup tables as intermediary structures that mediate between the aging compensation calculations and the actual display output. These LUTs serve as intermediaries that store pre-computed compensation data, allowing the system to translate raw display values into age-compensated values without requiring complex real-time computation algorithms, thereby simplifying the overall system architecture.
3Measurement precision
If decay ratios are calculated based on usage time, then aging compensation accuracy is improved, but the calculation process becomes more complex
Solution Approach 1:
The patent applies parameter changes by transforming the complex aging calculation into a parameter lookup process. Instead of performing complex real-time mathematical calculations to determine decay ratios, the system uses pre-computed parameters stored in lookup tables that map usage time to corresponding decay ratios, significantly simplifying the calculation process while maintaining accuracy.
Solution Approach 2:
The patent uses copying by creating lookup tables that copy pre-calculated aging compensation data. Rather than recalculating decay ratios for each display area in real-time, the system copies ready-to-use compensation values from pre-computed lookup tables, reducing computational complexity while preserving measurement precision for aging compensation.
Data Source
AI summary
A display screen aging compensation method, system, and device, the method including obtaining display data of each display area of a display screen having at least one display area, the display data including usage time t of the display area, a maximum gray level value Lev_max that is of each primary color and that is obtained before the display data, and an average gray level value Lev of each primary color of three primary colors within the usage time t, where the usage time is accumulated screen-on time that is of the display area and that is obtained after the display screen is powered on, obtaining a decay ratio of each primary color of the display area based on the display data, and performing aging compensation on each display area based on the decay ratio of each primary color of each display area.