Display Panel Bezel Transmittance Layout for Alignment Precision
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Solution Overview
Problem
In the production of flexible OLED display panels, the lack of spare space for alignment marks during the cover plate glass bonding process complicates precise alignment, as redundant corners are removed through laser cutting, necessitating the use of easily identifiable structures for camera-based alignment, which affects precision without occupying additional space.
Innovation Solution
Incorporating a bezel area with a first area of higher light transmittance than the display and second areas, allowing the first area to serve as an alignment mark without occupying additional space, enabling precise alignment through brightness contrast without affecting the display's circuit structure or effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If redundant corners are removed through laser cutting to save space, then the display panel structure is optimized, but alignment precision deteriorates due to lack of spare space for alignment marks
Solution Approach 1:
The patent applies local quality by creating a first area with higher light transmittance than the display and second areas. This localized optical property difference enables the first area to serve as an alignment mark with high identifiability for camera-based alignment, resolving the contradiction by providing alignment functionality within the existing bezel area without requiring additional space.
2Manufacturing precision
If alignment marks are added to ensure precise alignment, then alignment precision is improved, but device complexity increases due to additional structures
Solution Approach 1:
The patent applies universality by making the first area serve multiple functions: it acts as both a structural component of the bezel area and an alignment mark for camera-based alignment. The first area's higher light transmittance enables it to function as an easily identifiable alignment feature, eliminating the need for separate alignment mark structures and reducing overall device complexity.
3Manufacturing precision
If the first area with higher light transmittance is created for alignment, then alignment precision is improved, but light transmittance uniformity deteriorates
Solution Approach 1:
The patent intentionally creates local quality variation by designing the first area with higher light transmittance compared to the display and second areas. This deliberate non-uniformity in light transmittance is essential for the first area to serve as an alignment mark, as it provides high contrast for camera-based alignment. The contradiction is resolved by accepting localized optical variation as necessary for alignment functionality.
Data Source
AI summary
Embodiments of the present disclosure provide a display panel, including: a display substrate, wherein the display substrate includes a display area and a bezel area arranged around a periphery of the display area, the bezel area including a first area arranged around the periphery of the display area, and a second area arranged around a periphery of the first area; and the display substrate further includes a plurality of electrical functional layers located at different levels respectively and at least part of film layers therein being partially superposed; wherein at least part of the electrical functional layers are distributed in the display area, and at least part of the electrical functional layers are distributed in the first area and the second area, the first area having a higher light transmittance than the second area and the display area.