OLED White Balance Compensation via Subpixel Segmentation
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Solution Overview
Problem
Organic light-emitting display devices face issues with degradation of the organic layer over time, leading to changes in light emission efficiency and white balance due to environmental factors and electrical stress, causing variance in color tone and white balance across the display.
Innovation Solution
The implementation of a matrix arrangement of pixels and subpixels with independent gray level control, where the fourth pixel functions as a white pixel and includes subpixels emitting red, green, and blue light, allowing for adjustment of white balance by controlling the ratios of gray levels of the subpixels to compensate for organic layer degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the organic layer thickness and area vary according to pixel color, then the display can achieve desired color performance, but the organic layer degrades at varying degrees causing white balance changes over time
Solution Approach 1:
The pixel is divided into multiple subpixels (first subpixel, second subpixel, third subpixel) that can be independently controlled. Each subpixel has its own organic layer with specific thickness and area characteristics, allowing independent degradation compensation for each color channel while maintaining overall color performance.
Solution Approach 2:
The patent introduces dynamic control of subpixel gray levels that can be adjusted independently from the main pixel gray levels. This dynamic adjustment capability allows the display to compensate for organic layer degradation over time by varying subpixel emission levels to maintain white balance stability.
2Measurement precision
If subpixels are made smaller to reduce area, then the display can achieve higher resolution, but the subpixel control complexity increases
Solution Approach 1:
The pixel is divided into multiple subpixels (first subpixel, second subpixel, third subpixel) that can be independently controlled. Each subpixel has its own organic layer with specific thickness and area characteristics, allowing independent degradation compensation for each color channel while maintaining overall color performance.
Solution Approach 2:
The subpixels serve multiple functions: they contribute to the overall pixel light emission while also providing independent color control and degradation compensation capability. The same structural elements (electrodes, organic layers) are used in both the main pixel and subpixels, reducing the overall complexity increase.
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 solution enables easy adjustment and compensation of white balance, thereby maintaining image quality and extending the life of the organic light-emitting display device by slowing down organic layer degradation.
Implementation Method 1
The organic layer emits light at a luminance level corresponding to an electric current flowing between the first electrode and the second electrode
Data Source
AI summary
An organic light-emitting display device comprising first through third pixels emitting light of first through third colors, respectively and a fourth pixel comprising first through third subpixels which emit light of the first through third colors, respectively, is disclosed.