Cover Layer Alignment and Edge Taper for Distortion-Free Displays
Find Innovative SolutionsGenerate Solutions
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 featuring a cover layer that extends 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 inkjet printing densities to ensure uniform coverage and alignment, along with barrier ribs and openings to enhance visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the encapsulation layer is formed with uniform thickness, then manufacturing precision is improved, but the display quality is degraded due to slopes at edges
Solution Approach 1:
The patent applies local quality by differentiating the thickness of the encapsulation layer across different regions. The encapsulation layer has a first thickness in the display area and a second thickness in the non-display area, with the first thickness being greater than the second thickness. This regional differentiation allows the layer to maintain sufficient coverage and protective function in the display area while reducing thickness and eliminating slopes at the edges in the non-display area, thereby preventing display quality degradation.
2Reliability
If the encapsulation layer thickness is increased to improve coverage, then reliability is improved, but slopes and step differences are generated at edges
Solution Approach 1:
The patent segments the encapsulation layer into multiple regions with different thickness characteristics. The layer is divided into a display area portion with greater thickness for reliable encapsulation and a non-display area portion with reduced thickness to eliminate edge slopes. This segmentation allows each region to be optimized independently for its specific functional requirements.
Solution Approach 2:
The encapsulation layer implements local quality by having different thicknesses in different areas. The first thickness in the display area ensures sufficient encapsulation reliability, while the second thickness in the non-display area prevents slope formation. This localized thickness variation resolves the contradiction between overall coverage and edge quality.
3Object-affected harmful factors
If the cover layer extends uniformly across all areas, then visibility improvement is achieved, but manufacturing complexity increases
Solution Approach 1:
The cover layer applies local quality by having different thicknesses in different regions. The first thickness in the display area effectively covers and masks distortions and smudges, improving visibility. The second thickness in the non-display area is reduced, which simplifies the manufacturing process and reduces material usage while still maintaining the benefit of distortion masking where it matters most.
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.