Asymmetric Pixel Array for Reducing Color Fringing
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Solution Overview
Problem
The S-stripe arrangement in organic EL display devices suffers from significant color fringing due to unbalanced relative luminosities, particularly because the green sub-pixel is positioned at the farthest point from the center of the pixel, leading to deteriorated display quality.
Innovation Solution
The pixel array structure is modified by positioning the green sub-pixel closer to the center of the pixel and trimming parts of the red and blue sub-pixels to balance the relative luminosity distribution, ensuring the peaks of the spatial distributions of the green and blue sub-pixels approach each other, thereby reducing color fringing and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the green sub-pixel is positioned at the farthest point from the pixel center in the S-stripe arrangement, then the aperture ratio is improved, but color fringing occurs due to unbalanced relative luminosity distribution
Solution Approach 1:
The patent applies asymmetry by positioning the green sub-pixel (which has maximum relative luminosity) closer to the pixel center rather than at the farthest point. This asymmetric arrangement balances the spatial distribution of relative luminosity across the pixel, reducing color fringing while maintaining an optimized aperture ratio through carefully designed sub-pixel dimensions and positions.
Solution Approach 2:
The patent applies local quality by differentiating the sizes and positions of individual sub-pixels based on their relative luminosity characteristics. The green sub-pixel is positioned closer to the center with specific dimensional characteristics, while red and blue sub-pixels are positioned differently, creating a non-uniform local arrangement that optimizes overall luminosity balance and reduces color fringing effects.
2Object-generated harmful factors
If the green sub-pixel is positioned closer to the pixel center, then color fringing is reduced, but the aperture ratio may be compromised
Solution Approach 1:
The patent applies parameter changes by optimizing the dimensional parameters (width, height) and positional parameters (distance from pixel center) of each sub-pixel. By carefully adjusting these parameters, the green sub-pixel is positioned closer to the pixel center to reduce color fringing, while the overall aperture ratio is maintained at an optimized level through coordinated parameter adjustments across all sub-pixels.
3Ease of manufacture
If sub-pixels are arranged in traditional S-stripe configuration, then manufacturing is simplified, but display quality deteriorates due to unbalanced luminosity distribution
Solution Approach 1:
The patent modifies the traditional symmetric S-stripe arrangement by introducing asymmetric positioning of the green sub-pixel closer to the pixel center. This asymmetric modification maintains compatibility with standard manufacturing processes while significantly improving display quality by balancing the spatial distribution of relative luminosity and reducing color fringing effects.
Data Source
AI summary
There are provided a pixel array, an electro-optic device, and an electric apparatus. A pixel array includes plural pixels each having a rectangular shape and including a first-colored sub-pixel of a first color being the maximum in relative luminosity, a second-colored sub-pixel, and a third-colored sub-pixel of a third color being the minimum in relative luminosity. The third-colored sub-pixel is greater in size than each of the first-colored sub-pixel and the second-colored sub-pixel, and is arranged next to the first-colored sub-pixel and the second-colored sub-pixel. The center of gravity of the first-colored sub-pixel is located nearer to the center of gravity of the pixel than that of the second-colored sub-pixels, and/or the center of gravity of a part of the third-colored sub-pixel at the second-colored-sub-pixel side is located at a shorter distance to the center of gravity of the pixel than that of the other part of the third-colored sub-pixel.