Trapezoidal OLED Pixel Layout for Reduced Color Fringing
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Solution Overview
Problem
Existing OLED display panels suffer from significant color fringing effects, particularly magenta and green color fringes at the edges, due to the 'diamond' pixel arrangement, which affects the display quality.
Innovation Solution
The display panel is designed with sub-pixels arranged in a trapezoidal pattern where the centers of the sub-pixels form virtual trapezoids, with offsets and alternating vertices, reducing the number of sub-pixels at the edges and ensuring included angles between sides are within a specific range to minimize color fringing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the 'diamond' pixel arrangement is used, then the display panel can achieve full-color display with multiple sub-pixels, but significant color fringing effects occur at the edges
Solution Approach 1:
The patent transforms the traditional symmetric diamond arrangement into an asymmetric trapezoidal arrangement. The sub-pixels are positioned at vertices of a virtual trapezoid rather than forming a symmetric diamond shape, which breaks the symmetry that causes equal color fringing in all directions. This asymmetric positioning allows different edge lengths and angles, creating non-uniform light emission patterns that reduce the visibility of color fringes at panel edges.
Solution Approach 2:
The patent applies different positioning strategies to sub-pixels located at different positions within the display panel. Sub-pixels at critical edge positions are specifically arranged to minimize color fringing, while internal sub-pixels maintain standard spacing. The virtual trapezoid configuration allows selective optimization of edge regions without compromising the overall display area, addressing the local quality issue at panel boundaries.
2Ease of manufacture
If sub-pixels are arranged in a regular grid pattern, then manufacturing is simplified, but display uniformity and quality are compromised due to color fringing
Solution Approach 1:
The patent divides the display panel into multiple virtual trapezoid units, each containing a specific arrangement of sub-pixels. Rather than applying a single global arrangement pattern, the display is segmented into repeating trapezoidal modules. This segmentation maintains manufacturing simplicity through repetition while achieving improved display uniformity within each module, resolving the contradiction between ease of manufacture and display quality.
Solution Approach 2:
The patent modifies the geometric parameters of the pixel arrangement from a standard square grid to a trapezoidal configuration. Specifically, the angles and side lengths of the virtual trapezoid are optimized to reduce color fringing. By changing these geometric parameters while maintaining a regular repeating pattern, the patent achieves both manufacturing feasibility and improved display uniformity.
Data Source
AI summary
Provided are a display panel, a preparation method, and a display device. The display panel includes a plurality of first sub-pixels, a plurality of second sub-pixels, and a plurality of third sub-pixels. The plurality of third sub-pixels forms a first virtual trapezoid, and one of the plurality of first sub-pixels is located inside the first virtual trapezoid. The plurality of first sub-pixels and the plurality of second sub-pixels form a second virtual trapezoid, and one of the plurality of third sub-pixels is located inside the second virtual trapezoid. The first virtual trapezoid includes a first long side, a first oblique side, a first short side, and a second oblique side. The second virtual trapezoid includes a second long side, a third oblique side, a second short side, and a fourth oblique side.