Foldable Display Pixel Width Variation for Crack Prevention
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Solution Overview
Problem
Conventional foldable displays are prone to cracks and visible lines in bent areas due to bending forces, which degrade display quality.
Innovation Solution
A foldable display apparatus with a flexible substrate featuring pixels of varying widths in bent and non-bent areas, where the widths of bending pixels are smaller than non-bending pixels, and the distances between adjacent pixels are kept identical to prevent observable lines and reduce stress, thereby minimizing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pixels are formed in bent areas of the flexible substrate, then the display area is increased, but cracks occur in the pixels due to bending forces
Solution Approach 1:
The patent applies local quality by making pixels in the bent area have different dimensions (smaller width in the bending direction) compared to pixels in non-bent areas. This localized modification allows pixels in the bent region to accommodate curvature stress while maintaining display functionality, thereby preventing cracks without sacrificing overall display area.
2Adaptability or versatility
If pixels in bent areas have different distances from the bending axis, then the bending flexibility is improved, but visible lines appear in the display
Solution Approach 1:
The patent employs asymmetry by positioning pixels in bent areas at identical distances from the bending axis, creating a symmetric arrangement that prevents visible lines. This asymmetric design choice (maintaining symmetry in pixel positioning) allows the display to bend flexibly while maintaining visual uniformity across the display surface.
Data Source
AI summary
A display apparatus includes a flexible substrate, first pixels, and second pixels. The flexible substrate includes: a first area at least partially bent about an axis; and at least one non-bent area. The first pixels are disposed in the first area. The second pixels are disposed in the at least one non-bent area. Respective widths of each first pixel in a first direction are smaller than respective widths of each second pixel in the first direction.