OLED Pixel Arrangement Structure for Brightness Decay Compensation
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Solution Overview
Problem
Current OLED display apparatuses have large sub-pixel spacing, leading to increased driving current and reduced lifespan due to uneven brightness decay among color sub-pixels, with blue sub-pixels decaying faster than others.
Innovation Solution
A pixel arrangement structure with alternately arranged first and second repeating units, where first sub-pixels are concave polygons and third sub-pixels are convex polygons, reducing spacing and adjusting aperture ratios to balance brightness decay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sub-pixel spacing is increased to simplify manufacturing, then ease of manufacture is improved, but display resolution and aperture ratio deteriorate
Solution Approach 1:
The pixel structure is divided into multiple sub-pixels (first sub-pixel, second sub-pixel, third sub-pixel) with different shapes and functions. Each sub-pixel can be independently optimized for its specific role, allowing complex high-resolution patterns to be manufactured through systematic decomposition rather than attempting to create all patterns in a single step.
Solution Approach 2:
Different sub-pixels are assigned different shapes (concave polygon for first sub-pixel, convex polygon for third sub-pixel) and positions to optimize local light emission characteristics. This local differentiation allows each region to contribute optimally to the overall display resolution while maintaining manufacturability through standardized fabrication processes.
2Illumination intensity
If driving current is increased to meet brightness requirements, then illumination intensity is improved, but device lifespan and reliability deteriorate
Solution Approach 1:
Different sub-pixels are designed with different shapes and positions to compensate for their inherent brightness decay characteristics. Blue sub-pixels (third sub-pixel with convex polygon shape) that decay faster are given larger aperture ratios, while red sub-pixels (first sub-pixel with concave polygon shape) that decay slower have smaller aperture ratios. This local optimization balances overall display brightness without requiring excessive driving current, thereby extending device lifespan.
Solution Approach 2:
The aperture ratio parameter is specifically adjusted for different sub-pixel types based on their brightness decay characteristics. By changing the geometric parameters (shape and size) of each sub-pixel, the patent optimizes light emission efficiency to achieve required brightness levels with lower driving current, thus improving reliability and service life.
3Illumination intensity
If sub-pixel aperture ratio is increased to improve brightness, then illumination intensity is improved, but manufacturing precision and pattern uniformity deteriorate
Solution Approach 1:
The display is segmented into multiple sub-pixel types with different standardized shapes (concave polygons, convex polygons). Each sub-pixel type has a defined geometric pattern that can be manufactured with consistent precision using standard fabrication processes. This segmentation allows large aperture ratios to be achieved while maintaining pattern uniformity through systematic design rather than arbitrary variations.
Solution Approach 2:
The patent employs asymmetric polygon shapes (concave and convex) for different sub-pixels rather than uniform circular or rectangular patterns. These asymmetric shapes are specifically designed to fit together in a tessellating pattern that maintains manufacturing precision while optimizing light emission. The asymmetric designs allow for larger effective aperture ratios without compromising the uniformity of the overall pixel pattern.
Data Source
AI summary
The present disclosure is related to a pixel arrangement structure. The pixel arrangement structure may include a plurality of first repeating units and a plurality of second repeating units alternately arranged in both a first direction and a second direction. Each of the plurality of the first repeating units may comprise a first sub-pixel or a second sub-pixel, and each of the plurality of the second repeat units may comprise a third sub-pixel or a second sub-pixel. Second sub-pixels may be uniformly distributed in an array. At least some of first sub-pixels have a shape of a concave polygon, and at least some of third sub-pixels have a shape of a convex polygon.