OLED Signal Line Overlap Layout for Uniform Sub-Pixel Flatness
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Solution Overview
Problem
OLED display panels face a display color shift issue due to uneven flatness of sub-pixels' electrodes, leading to inconsistent brightness and color representation under the same viewing angle, affecting image quality.
Innovation Solution
The display panel design includes signal lines with overlap portions that correspond to sub-pixels of the same emission color, featuring first conductive holes with uniform orthographic projections on the substrate, ensuring consistent flatness of the electrodes and reducing color shift by arranging these overlap portions with a consistent number and layout of through holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If signal lines are arranged to overlap with sub-pixels of the same emission color, then manufacturing simplicity is improved, but display color shift occurs due to uneven first electrode flatness
Solution Approach 1:
The patent introduces protruding structures at specific locations where signal lines overlap with sub-pixels of the same emission color. These protrusions create local variations in electrode thickness to compensate for the flatness unevenness caused by the overlapping signal lines, thereby achieving uniform first electrode flatness while maintaining the simple overlapping arrangement
Solution Approach 2:
The patent employs asymmetric protruding structures with different heights or positions at different overlap portions. By introducing asymmetry in the protrusion design, the patent can compensate for the non-uniform flatness effects at different locations, ensuring that all first electrodes of sub-pixels of the same emission color have consistent flatness despite the overlapping signal lines
2Device complexity
If overlap portions are positioned to simplify wiring layout, then device complexity is reduced, but display color shift increases due to inconsistent electrode flatness
Solution Approach 1:
The patent applies protruding structures selectively at specific overlap portions where signal lines intersect with sub-pixels of the same emission color. This localized approach maintains the simplicity of the overall wiring layout while addressing the specific flatness issues at critical locations, thereby ensuring display color consistency without increasing overall device complexity
Solution Approach 2:
The protruding structures are pre-formed during the manufacturing process at the overlap portions before the final assembly. This preliminary action compensates for the flatness unevenness that would otherwise occur during operation, ensuring consistent electrode flatness and display color reliability while maintaining a simple wiring layout
Data Source
AI summary
A display panel and an electronic device are provided. The display panel includes an array substrate including a substrate, a pixel circuit disposed on the substrate, and a plurality of signal lines distributed in parallel and disposed on a side of the pixel circuit away from the substrate. The plurality of signal lines are connected to wirings below the signal lines through first conductive holes. The display panel also includes a display array including a plurality of sub-pixels and located on a side of the plurality of signal lines away from the substrate. In a direction perpendicular to the substrate, the signal lines include overlap portions overlapping first electrodes of the plurality of sub-pixels; at least two overlap portions correspond to sub-pixels of a same emission color and include first conductive holes; and orthographic projections of the at least two overlap portions on the substrate are same.