OLED Panel Layer Boundary Layout for Narrow Bezel Trace Isolation
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Solution Overview
Problem
Conventional OLED display panels face issues with abnormal light emission and manufacturing difficulties when designing narrow bezels due to the compression of the light-emitting functional layer, which can either result in thin edges leading to abnormal light emission or covering conductive units, causing electrical connection issues.
Innovation Solution
A display panel design that includes a specific arrangement of layers and structures, utilizing laser etching to remove the light-emitting functional layer in non-display areas, ensuring its boundary is between the second trace sub-area and the display area, preventing coverage of conductive traces, and using banks to maintain the necessary spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the distribution range of the light-emitting functional layer is compressed to achieve narrow bezel, then the bezel width is reduced, but the light-emitting functional layer becomes too thin within some openings at the edge of the pixel definition layer, resulting in abnormal light emission
Solution Approach 1:
The patent extracts the light-emitting functional layer from the bezel area by introducing a pixel definition layer that defines a boundary. This boundary separates the display area from the non-display area, effectively removing the light-emitting functional layer from the bezel region where it would otherwise be too thin and cause abnormal light emission.
Solution Approach 2:
The patent segments the display panel into distinct display area and non-display area through the pixel definition layer. This segmentation allows the light-emitting functional layer to be present in the display area while being excluded from the bezel area, solving the thickness problem in the bezel region.
2Manufacturing precision
If the distribution range of the light-emitting functional layer is not compressed, then the light-emitting functional layer maintains sufficient thickness, but it covers the conductive units in the non-display area, affecting the connection between the conductive unit and the cathode, leading to abnormal scrapping
Solution Approach 1:
The patent extracts the light-emitting functional layer from the non-display area by introducing a pixel definition layer with a boundary that separates the display area from the non-display area. This ensures the light-emitting functional layer does not cover conductive units in the non-display area, maintaining electrical connection reliability.
Solution Approach 2:
The patent segments the panel into display and non-display areas using the pixel definition layer. This segmentation prevents the light-emitting functional layer from extending into the non-display area where it would interfere with conductive units and electrical connections.
3Reliability
If the light-emitting functional layer boundary is positioned to avoid conductive traces, then electrical connections are maintained, but the bezel design is compromised
Solution Approach 1:
The patent extracts the light-emitting functional layer from the bezel area through the pixel definition layer boundary, allowing narrow bezel design while preventing coverage of conductive traces. This extraction maintains electrical connection reliability without compromising the narrow bezel design.
Solution Approach 2:
The patent uses the vertical dimension (layer stacking) to solve the horizontal bezel width problem. By positioning the pixel definition layer and light-emitting functional layer boundary in the vertical layer structure, the design achieves narrow bezel width while maintaining electrical connection reliability through proper layer arrangement.
Data Source
AI summary
A display panel and a display device are provided. A boundary of a light-emitting functional layer in a non-display area is located between a second trace sub-area and a display area. Accordingly, in a narrow bezel design, the light-emitting functional layer is prevented from covering a conductive trace in the non-display area, thereby avoiding abnormal electrical connections between the conductive trace in the non-display area and a second conductive layer.