Flexible Display Pixel Spacing for Bending Reliability
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Solution Overview
Problem
Flexible display devices face mechanical defects and cracking issues due to their bent shape, particularly in the bending regions, which affect their reliability and durability.
Innovation Solution
The flexible display device features a substrate with distinct bending and non-bending regions, where pixels in the bending region are spaced farther apart than those in the non-bending region, allowing for the removal of insulating layers to reduce stress and enhance bending reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixels are densely packed in the bending region, then display resolution is improved, but mechanical stress and cracking risk increase
Solution Approach 1:
The patent applies different pixel spacing strategies to different regions of the display device. In the bending region, pixels are spaced farther apart (first distance) to reduce mechanical stress, while in the non-bending region, pixels are spaced closer together (second distance) to maximize resolution. This local differentiation resolves the contradiction between resolution and bending reliability.
Solution Approach 2:
The display device is segmented into distinct bending and non-bending regions with different pixel density characteristics. This segmentation allows each region to be optimized independently - the bending region prioritizes mechanical durability with reduced pixel density, while the non-bending region prioritizes visual resolution with higher pixel density.
2Reliability
If insulating layers are removed in the bending region, then stress intensity is reduced, but manufacturing complexity increases
Solution Approach 1:
The manufacturing process is segmented into region-specific steps. Insulating layers are selectively removed only in the bending region where they would create stress concentration, while they are retained in the non-bending region. This targeted approach reduces stress intensity in critical areas without unnecessarily complicating the entire manufacturing process.
Solution Approach 2:
The insulating layer structure is differentiated by region - removed in the bending region to reduce stress, and maintained in the non-bending region where it provides necessary electrical isolation. This local quality adjustment optimizes both mechanical performance and electrical functionality without uniform complexity throughout the device.
Data Source
AI summary
A flexible display device includes a substrate, a plurality of first pixels, and a plurality of second pixels. The substrate includes a foldable bending region and a non-foldable non-bending region. Each first pixel is disposed on the bending region. Each first pixel is spaced apart from an adjacent first pixel by a first distance. Each second pixel is disposed on the non-bending region. Each second pixel is spaced apart from an adjacent second pixel by a second distance. The first distance is greater than the second distance.