OLED Pixel Arrangement Structure for Aperture Ratio and Deposition Reliability
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Solution Overview
Problem
Existing OLED displays face a trade-off between aperture ratio and deposition reliability, where reducing gaps between pixels improves deposition but deteriorates aperture ratio, and increasing gaps improves aperture ratio but compromises deposition reliability.
Innovation Solution
A pixel arrangement structure with specific polygonal shapes and spacing for pixels, including octagonal, hexagonal, and quadrilateral configurations, that enhances aperture ratio while maintaining deposition reliability through optimized gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the gap between neighboring pixels is reduced to obtain a high aperture ratio, then the aperture ratio is improved, but deposition reliability is deteriorated
Solution Approach 1:
The pixel array is divided into different types of pixels (first pixels and second pixels) with different shapes and sizes. First pixels have a first shape and second pixels have a second shape that is different from the first shape. This segmentation allows different regions to have optimized gap configurations, enabling high aperture ratio while maintaining deposition reliability through varied spacing patterns.
Solution Approach 2:
Different pixels are assigned different local characteristics including different shapes (first shape vs. second shape), different areas (first area vs. second area), and different gap configurations. This local quality variation allows the display to achieve high overall aperture ratio while specific local regions maintain adequate spacing for reliable organic emission layer deposition.
2Reliability
If the gap between pixels is increased to improve deposition reliability, then deposition reliability is improved, but the aperture ratio of the pixels is deteriorated
Solution Approach 1:
The pixel array is divided into different types of pixels (first pixels and second pixels) with different shapes and sizes. First pixels have a first shape and second pixels have a second shape that is different from the first shape. This segmentation allows different regions to have optimized gap configurations, enabling high aperture ratio while maintaining deposition reliability through varied spacing patterns.
Solution Approach 2:
Different pixels are assigned different local characteristics including different shapes (first shape vs. second shape), different areas (first area vs. second area), and different gap configurations. This local quality variation allows the display to achieve high overall aperture ratio while specific local regions maintain adequate spacing for reliable organic emission layer deposition.
3Area of stationary object
If uniform pixel shapes and spacing are used, then manufacturing is simplified, but aperture ratio is limited
Solution Approach 1:
The pixel array is divided into different types of pixels (first pixels and second pixels) with different shapes and sizes. First pixels have a first shape and second pixels have a second shape that is different from the first shape. This segmentation allows different regions to have optimized gap configurations, enabling high aperture ratio while maintaining deposition reliability through varied spacing patterns.
Solution Approach 2:
Different pixels are assigned different local characteristics including different shapes (first shape vs. second shape), different areas (first area vs. second area), and different gap configurations. This local quality variation allows the display to achieve high overall aperture ratio while specific local regions maintain adequate spacing for reliable organic emission layer deposition.
Data Source
Figure 1
AI summary
A pixel arrangement structure of an organic light emitting diode (OLED) display is provided. The pixel arrangement structure includes: a plurality of pixels for displaying an image on the OLED display and comprising: a first pixel; and a pair of second pixels separated from the first pixel, the second pixels being located at opposite sides of the first pixel along a first line on which the first and the second pixels, and another first pixel are consecutively arranged; and a pair of third pixels separated from the first pixel and the second pixels, the third pixels being located at opposite sides of the first pixel along a second line on which the first and the third pixels, and another first pixel are consecutively arranged, the second line crossing the first line at a location of the first pixel, wherein a first distance between the second pixels is greater than a second distance between one of the second pixels and a neighboring one of the third pixels, and wherein the first pixels are configured to emit light having a color that is different from those of the second pixels and the third pixels, and the first pixels have a different size from at least one of the second pixels or the third pixels