OLED Pixel Arrangement Layout for Aperture Ratio and Deposition Reliability
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Solution Overview
Problem
In OLED displays, reducing the gap between pixels to enhance the aperture ratio can compromise deposition reliability, while increasing the gap to improve reliability diminishes the aperture ratio.
Innovation Solution
A pixel arrangement structure for OLED displays is proposed, where a first pixel is centered within a virtual square, and second and third pixels are positioned at the vertices of the square, allowing for efficient gap setting between pixels while maintaining a high aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the gap between pixels is reduced to enhance aperture ratio, then the aperture ratio is improved, but deposition reliability is compromised
Solution Approach 1:
The patent applies asymmetry by positioning pixels at non-uniform intervals along the gate line direction. Specifically, the distance between adjacent pixels in the same column is set to a first interval, while the distance between pixels in adjacent columns is set to a second interval that is larger than the first interval. This asymmetric arrangement allows the aperture ratio to be maximized while maintaining sufficient deposition reliability by strategically increasing gaps in specific directions.
Solution Approach 2:
The patent transitions from a one-dimensional uniform spacing approach to a two-dimensional asymmetric spacing arrangement. By considering both the gate line direction and the direction perpendicular to it, the patent optimizes pixel positioning in multiple dimensions. This dimensional expansion allows simultaneous optimization of aperture ratio and deposition reliability through differentiated spacing in different spatial directions.
2Reliability
If the gap between pixels is increased to improve deposition reliability, then deposition reliability is improved, but the aperture ratio is diminished
Solution Approach 1:
The patent applies local quality by implementing different gap sizes in different spatial locations and directions. The first interval (smaller gap) is applied between adjacent pixels in the same column to maximize aperture ratio, while the second interval (larger gap) is applied between pixels in adjacent columns to ensure deposition reliability. This localized differentiation of gap sizes optimizes both competing requirements in their respective regions.
Data Source
AI summary
A pixel arrangement structure of an organic light emitting diode (OLED) display is provided. The pixel arrangement structure includes: a first pixel having a center coinciding with a center of a virtual square; a second pixel separated from the first pixel and having a center at a first vertex of the virtual square; and a third pixel separated from the first pixel and the second pixel, and having a center at a second vertex neighboring the first vertex of the virtual square. The first pixel, the second pixel, and the third pixel have polygonal shapes.