Cover Layer Edge Profile for Smudge-Free Display Encapsulation
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Solution Overview
Problem
Display devices experience degraded display quality due to thickness variations and slopes in the encapsulation layer, particularly at the edges, leading to visibility issues such as spots and smudges.
Innovation Solution
A display device design that includes a cover layer extending over both the display and non-display areas, with a gradual decrease in height towards the lateral sides, and a touch sensing layer with specific electrode configurations, along with an encapsulation layer comprising multiple films, to address thickness discrepancies and enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the encapsulation layer thickness is increased to improve sealing, then sealing performance is improved, but thickness variations and slopes are generated at the edges causing display quality degradation
Solution Approach 1:
The encapsulation layer is designed with different thicknesses at different locations: a first thickness in the display area and a second thickness (greater than the first) in the non-display area. This local variation in thickness provides enhanced sealing at the edges while maintaining display quality in the display area.
Solution Approach 2:
An inclined surface is introduced as a transitional region between the display area and non-display area. This inclined surface gradually transitions the thickness from the first thickness to the second thickness, eliminating abrupt step differences and slopes that cause display defects.
2Manufacturing precision
If the encapsulation layer has uniform thickness to improve display quality, then display quality is improved, but sealing performance at the edges is compromised
Solution Approach 1:
Different regions of the encapsulation layer are assigned different thicknesses tailored to their specific functions: the display area maintains uniform thickness for optimal display quality, while the non-display area has increased thickness to provide enhanced sealing and edge protection.
3Ease of manufacture
If the encapsulation layer has abrupt thickness changes to simplify manufacturing, then manufacturing complexity is reduced, but display quality is degraded due to slopes and step differences
Solution Approach 1:
Instead of abrupt thickness changes, an inclined surface is introduced as a gradual transition region. This inclined surface smoothly connects the display area and non-display area, eliminating step differences and slopes that cause display defects, while still being manufacturable through standard processes.
Data Source
AI summary
A display device includes a substrate including a display area and a non-display area. A light-emitting element layer is disposed on the display area. An encapsulation layer is disposed on the light-emitting element layer and extends into the non-display area. A touch sensing layer is disposed on the encapsulation layer. A cover layer is disposed on the touch sensing layer and extends into the non-display area. Lateral sides of the substrate are aligned with lateral sides of the cover layer.