OLED Degradation Compensation via Dynamic Gamma Voltage
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Solution Overview
Problem
OLED display devices face challenges in maintaining sufficient compensation margin for luminance degradation, especially in high grayscale regions, leading to increased power consumption and degraded picture quality.
Innovation Solution
A data processing method and apparatus that modulates input data using a maximum degradation compensation gain, accumulates and analyzes data to determine degradation compensation gains, and adjusts peak luminance control gains to secure a sufficient compensation margin, even in high grayscale regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If degradation compensation is performed using a fixed maximum gamma voltage, then compensation margin is secured in low and middle grayscale regions, but compensation is impossible in high grayscale regions
Solution Approach 1:
The patent implements dynamic adjustment of the maximum gamma voltage based on the input grayscale value. Instead of using a fixed maximum gamma voltage, the system selectively applies different voltage levels according to the grayscale region, enabling adaptive degradation compensation across all grayscale values including high grayscale regions where previous methods failed.
Solution Approach 2:
The patent changes the parameter of maximum gamma voltage from a fixed value to a variable value that depends on the grayscale input. By adjusting the voltage parameter dynamically according to the grayscale region, the system achieves effective degradation compensation across the entire grayscale range while maintaining sufficient compensation margin.
2Reliability
If maximum gamma voltage is increased to secure compensation margin, then degradation compensation is possible, but power consumption increases and grayscale rendering capability degrades
Solution Approach 1:
The patent applies different maximum gamma voltage levels to different grayscale regions rather than uniformly increasing the voltage across all regions. By applying higher voltage only where needed (low and middle grayscale regions with insufficient margin) and maintaining lower voltage in regions where margin is sufficient, the system secures compensation margin locally without causing global power consumption increase or grayscale rendering degradation.
3Use of energy by moving object
If peak luminance is controlled to reduce power consumption, then energy efficiency improves, but compensation margin for degradation is reduced
Solution Approach 1:
The patent performs preliminary adjustment of the maximum gamma voltage before degradation compensation is applied. By pre-adjusting the voltage level according to the grayscale value and expected degradation, the system ensures sufficient compensation margin is available even when operating at reduced peak luminance levels for power savings, rather than needing to increase voltage after degradation occurs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for adaptive control of peak luminance, reducing power consumption and maintaining picture quality by securing a desired compensation margin during luminance degradation, enabling effective degradation compensation without luminance reduction.
Implementation Method 1
An organic light emitting diode (OLED) display device is a self-luminous device in which an organic light emitting layer emits light through re-combination of electrons and holes
Data Source
AI summary
A data processing method and an apparatus for an organic light emitting diode (OLED) display device are provided. The method includes modulating input data using a maximum degradation compensation gain, compensating degradation of the modulated data using a degradation compensation gain, accumulating the degradation-compensated data, determining a degree of degradation of each of sub-pixels, based on the accumulated data, detecting a degradation compensation gain in accordance with the determined degradation degree, storing the detected degradation compensation gain, and outputting the stored degradation compensation gain, detecting a maximum one of degradation compensation gains of respective sub-pixels, and outputting the detected maximum degradation compensation gain, analyzing the input data, thereby setting a peak luminance control (PLC) gain, and modulating the PLC gain, using the output maximum degradation compensation gain, and analyzing the degradation-compensated data, thereby detecting a peak luminance, and adjusting the detected peak luminance, using the modulated PLC gain.