Flexible Display Bending Area Crack Prevention via Segmented Organic Films
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Solution Overview
Problem
Flexible display devices face issues with cracks in lines and organic films during bending, leading to signal transmission defects and reduced line density in narrow bezel areas, which complicates high-resolution display requirements.
Innovation Solution
The display device incorporates a bending area with patterned first and second organic films and lines that are electrically connected, featuring open areas and zigzag patterns to minimize stress and prevent crack propagation, allowing for increased line density and improved flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lines is increased to achieve high resolution, then the display resolution is improved, but the bezel area is reduced making it difficult to arrange lines
Solution Approach 1:
The patent divides the single bending area into multiple bending areas, allowing lines to be arranged in different directions across multiple segments. This segmentation enables higher line density without requiring a proportionally larger bezel area, as each bending area can be optimized independently for line arrangement.
Solution Approach 2:
The patent utilizes the third dimension by creating multiple stacked bending areas. Instead of arranging all lines in a single two-dimensional plane, lines are distributed across multiple vertical layers (first bending area, second bending area, etc.), effectively increasing the available space for line arrangement without increasing the horizontal or vertical footprint of the bezel.
2Quantity of substance
If lines are arranged densely in the bending area, then the line density is improved, but cracks are generated due to stress
Solution Approach 1:
The patent segments the bending area into multiple independent regions (first bending area, second bending area, third bending area). Each segment contains a subset of lines and can deform independently during bending, distributing the mechanical stress across multiple segments rather than concentrating it in a single area. This reduces the likelihood of crack formation while maintaining high overall line density.
Solution Approach 2:
By arranging lines across multiple vertical layers (different bending areas stacked in the vertical dimension), the patent reduces the line density within any single bending area. This three-dimensional distribution maintains high overall line density while reducing the stress concentration in each individual layer, thereby improving crack resistance.
3Measurement precision
If the number of lines is increased in a narrow bezel area, then the display resolution is improved, but the stress on lines increases causing cracks
Solution Approach 1:
The patent divides the bending area into multiple segments (first, second, third bending areas), each containing a portion of the total lines. During bending, the stress is distributed across these multiple segments rather than concentrated on all lines in a single area. This segmentation allows high line density to be achieved while maintaining lower stress levels on individual lines.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking multiple bending areas. Lines are distributed across different vertical layers, which reduces the stress concentration in any single layer during bending. This three-dimensional arrangement enables high resolution with increased line count while managing stress through spatial distribution.
Data Source
AI summary
A display device is disclosed, which may increase the number of lines arranged in a bending area and at the same time may minimize a crack generated in the bending area. The display device comprises a display area in which pixels are arranged, and a non-display area surrounding the display area, provided with a bending area within the non-display area; a plurality of first lines arranged in the bending area and electrically connected with the pixels; a first organic film arranged on the first lines; a plurality of second lines arranged on the first organic film in the bending area and electrically connected with the pixels; and a second organic film arranged on the second lines, wherein at least one of the first organic film and the second organic film is provided with an open area.