OLED Pixel Arrangement Optimizing Aperture Ratio and Resolution
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Solution Overview
Problem
Conventional organic light emitting display devices face challenges in maintaining a high aperture ratio while achieving high-resolution imaging, primarily due to the limitations of pixel arrangements that result in reduced luminance and color purity.
Innovation Solution
A pixel arrangement is introduced where sub-pixel groups are repeatedly arranged with first, second, and third sub-pixels, with the third sub-pixel being at least two times longer and having a wider area than the first sub-pixel, and positioned to overlap adjacent rows of first and second sub-pixels, optimizing the arrangement to enhance aperture ratio and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional pixel arrangements are used to achieve high-resolution, then resolution is improved, but aperture ratio deteriorates
Solution Approach 1:
The pixel structure is segmented into multiple sub-pixels (first, second, and third sub-pixels) with different functions and sizes. The third sub-pixel is specifically designed to be larger and overlap adjacent rows, while first and second sub-pixels are arranged in alternating columns. This segmentation allows optimization of different regions for different purposes, achieving both high resolution and high aperture ratio.
Solution Approach 2:
The third sub-pixel extends in the row direction to overlap adjacent rows, utilizing the vertical dimension to increase aperture area without compromising horizontal resolution. This dimensional approach allows the aperture ratio to be improved by using space in the row direction that would otherwise be occupied by black matrix regions.
2Ease of manufacture
If uniform sub-pixel arrangement is used, then manufacturing simplicity is maintained, but display performance deteriorates
Solution Approach 1:
Different sub-pixels are designed with different properties: first and second sub-pixels have standard sizes and are arranged in alternating columns, while the third sub-pixel has a larger area and overlaps adjacent rows. This local differentiation optimizes each sub-pixel's contribution to display performance while maintaining overall pattern regularity for manufacturability.
Solution Approach 2:
The pixel arrangement employs asymmetric sub-pixel sizing and positioning, where the third sub-pixel is deliberately made larger and positioned to overlap adjacent rows, while first and second sub-pixels maintain standard dimensions. This asymmetry is strategically applied to enhance display performance without completely disrupting the periodic pattern needed for manufacturing.
3Measurement precision
If blue sub-pixels are made smaller to fit more pixels, then resolution is improved, but sub-pixel lifespan deteriorates
Solution Approach 1:
The third sub-pixel parameters (area and positioning) are changed to be larger and overlapping adjacent rows, which compensates for the reduced size of individual blue sub-pixels. This parameter change ensures that blue sub-pixels have sufficient active area for acceptable lifespan while still achieving high overall resolution through the optimized pixel arrangement.
Data Source
AI summary
A pixel arrangement of an organic light emitting display device with a plurality of repeatedly arranged sub-pixel groups, each of the sub-pixel groups includes two first sub-pixels in i-th and (i+2)-th columns (i is a natural number), two second sub-pixels in the i-th and (i+2)-th columns, the second sub-pixels being arranged in different rows with respect to the first sub-pixels, and two third sub-pixels in (i+1)-th and (i+3)-th columns, each third sub-pixel being arranged to overlap at least two adjacent rows of the first and second sub-pixels.