Asymmetrical Pixel Structure for OLED Display
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Solution Overview
Problem
Organic light emitting display devices with symmetrical or checkerboard pixel structures suffer from reduced cognitive fill factor, lattice defects, and color fringe due to regular subpixel arrangements, leading to suboptimal image rendering and visibility issues.
Innovation Solution
The implementation of an asymmetrical pixel structure where adjacent pixels share subpixels, with the green subpixel included in one pixel and the blue and red subpixels shared between adjacent pixels, allowing for improved cognitive fill factor and reduced lattice defects and color fringe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a symmetrical or checkerboard pixel structure is used, then the manufacturing process is simplified and subpixels are regularly arranged, but the cognitive fill factor deteriorates and lattice defects occur
Solution Approach 1:
The patent applies asymmetry by configuring adjacent pixels with different subpixel arrangements. Specifically, first pixels have a first arrangement pattern while second pixels have a second arrangement pattern, breaking the symmetry of traditional checkerboard structures. This asymmetric design prevents regular lattice defects while maintaining manufacturing feasibility, thereby improving cognitive fill factor without excessively complicating the manufacturing process.
2Device complexity
If a checkerboard pattern structure is used, then the pixel structure is simplified and easy to manufacture, but color fringe occurs at edges of small-sized letters or pictures
Solution Approach 1:
The patent eliminates color fringe by introducing asymmetric subpixel arrangements in adjacent pixels. The first pixels and second pixels have different arrangement patterns, which disrupts the regular color distribution that causes fringe effects at text edges. This maintains relatively simple device structure while significantly reducing color fringe artifacts.
Solution Approach 2:
The patent applies local quality by allowing different regions (first pixels vs. second pixels) to have different subpixel arrangement characteristics. This localized variation in arrangement patterns enables the device to eliminate color fringe in specific areas without requiring complete redesign of the entire pixel structure, thus balancing complexity reduction with quality improvement.
3Device complexity
If only two colors are arranged in a single pixel, then the pixel structure is simplified, but the cognitive fill factor deteriorates because all three colors of light are not emitted
Solution Approach 1:
The patent merges the functionality of multiple pixels by enabling subpixel sharing. Adjacent pixels share common subpixels, allowing three colors (RGB) to be emitted within the effective area of what would traditionally be a two-color pixel. This combining approach improves cognitive fill factor by ensuring all three colors are present while maintaining simplified device structure through the sharing mechanism.
Data Source
AI summary
An organic light emitting display device includes subpixel groups including a plurality of subpixels, the subpixel groups being repeatedly arranged, wherein each of the subpixel groups includes a first subpixel unit and a second subpixel unit which each include a single blue subpixel, a single red subpixel, and two green subpixels, the two green subpixels of the first subpixel unit are arranged to be spaced apart in different directions with respect to a first extended line that runs through centers of the blue subpixel and the red subpixel of the first subpixel unit, and the two green subpixels of the second subpixel unit are arranged to be spaced apart in the same direction with respect to a second extended line that runs through centers of the blue subpixel and the red subpixel of the second subpixel unit.