OLED Anode Flatness via Asymmetric Pixel Circuit Alignment
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Solution Overview
Problem
Existing OLED display panels face issues with the flatness of anodes, leading to deviations in light emission direction, color separation, and color cast, which affect display brightness and overall display effect.
Innovation Solution
The display panel incorporates a substrate with pixel circuits arranged in rows and columns, where each pixel circuit group consists of a first and second pixel circuit symmetric about a column direction. Anodes are positioned on the side of the pixel circuits away from the substrate, with overlapping portions connecting the pixel circuits to the anodes. The anodes are designed with specific shapes and orientations to enhance flatness and reduce light deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the anode is positioned directly above the pixel circuit without specific orientation design, then the structure is simple, but the anode flatness is poor causing light emission deviation and color separation
Solution Approach 1:
The anode structure employs asymmetric positioning relative to the pixel circuit, with the anode center line offset from the pixel circuit center line by a specific distance (e.g., 2-5 μm). This asymmetric configuration optimizes the anode flatness to prevent light emission deviation and color separation, while maintaining reasonable structural complexity
Solution Approach 2:
The patent introduces a new dimensional parameter - the offset distance between the anode center line and pixel circuit center line. By controlling this lateral offset in the horizontal dimension, the anode flatness is improved, which would otherwise require complex three-dimensional structural adjustments
2Manufacturing precision
If the anode is rotated at a specific angle relative to the pixel circuit, then light emission uniformity is improved, but the alignment complexity increases
Solution Approach 1:
The patent optimizes specific geometric parameters including the anode rotation angle (e.g., 15-30 degrees relative to the pixel circuit) and the offset distance between center lines. By precisely controlling these parameters within specific ranges, light emission uniformity is improved while keeping the alignment process manageable through defined parameter specifications
3Reliability
If the overlapping portion between pixel circuit and anode is enlarged, then the electrical connection is improved, but the light emission area is reduced
Solution Approach 1:
The patent applies different design requirements to different regions: the overlapping portion between pixel circuit and anode is optimized for electrical connection reliability with sufficient overlap area, while the main body portion of the anode is optimized for light emission with appropriate size and shape. This local differentiation allows both electrical connection and light emission area requirements to be satisfied
Data Source
AI summary
A display panel includes a substrate, pixel circuits and anodes. A row of pixel circuits is divided into pixel circuit groups, and a group includes a first pixel circuit and a second pixel circuit. In the same group, a first pixel circuit is symmetrical with a second pixel circuit about a first axis. Each pixel circuit includes and overlapping portion. Overlapping portions of the first and second pixel circuits are a first overlapping portion and second overlapping portion. Along a second direction, a minimum distance between the first and second overlapping portions in the same group is a first distance, where the second direction is a row direction in which the pixel circuits are arranged. Along the second direction, a minimum distance between adjacent first and second overlapping portions belonging to different groups is a second distance, and the first distance is less than the second distance.