Chamfered Cover Window Edge for Circular Display Step Masking
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Solution Overview
Problem
Wearable display devices with circular display areas often exhibit a step structure at the edge, which affects display quality by making the edge area visible, leading to an imperfect circular shape.
Innovation Solution
A display device with a chamfered edge portion on the cover window, specifically designed to prevent or reduce the visibility of the step structure, using materials like glass, sapphire, diamond, PMMA, or polycarbonate, where the chamfered angle and width of the edge portion are optimized for total light reflection, ensuring the edge pixels are invisible.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If pixels are arranged in a step structure from center to edge to achieve circular shape, then the display area can be formed with circular shape, but the step structure becomes visible at the edge area reducing display quality
Solution Approach 1:
A non-display area is introduced as an intermediary region between the display area and the outer boundary. This non-display area acts as a buffer zone that masks the step structure of pixels at the edge of the display area, preventing it from being visible and thus resolving the contradiction between achieving circular shape and maintaining edge quality.
Solution Approach 2:
The edge area of the display area is designed with different properties from the center area. Specifically, the number of pixels is reduced at the edge to form a step structure, and this edge region is locally differentiated by introducing a non-display area that has different optical or visual characteristics, making the step structure invisible and improving local quality at the boundary.
2Shape
If the number of pixels decreases from center to edge area, then circular shape is achieved, but the edge area becomes distinguishable from center area affecting display uniformity
Solution Approach 1:
The non-display area serves as a mediator that transitions the visual appearance from the pixel-rich center area to the pixel-sparse edge area. By providing this intermediate zone, the abrupt change in pixel density is softened, and the edge area becomes indistinguishable from the center area, maintaining display uniformity while preserving the circular shape.
Solution Approach 2:
The non-display area may utilize color or optical property changes to mask the pixel step structure. By adjusting the optical characteristics (such as color, reflectivity, or transparency) of the non-display area, the transition from center to edge becomes smooth, preventing the edge area from being visually distinguishable and maintaining overall display uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design enhances display quality by eliminating the visibility of the step structure at the edge, providing a more circular and aesthetically pleasing display area.
Implementation Method 1
the edge portion is chamfered... the chamfered angle and width of the edge portion are optimized for total light reflection
Data Source
AI summary
A display device includes: a display panel including a display area having a circular shape; and a cover window on the display panel, wherein the cover window includes: a center portion covering a center area of the display area; and an edge portion covering an edge area of the display area, and the edge portion is chamfered.