Display Module Bending Area Strain Reduction
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Solution Overview
Problem
In full-screen mobile phones and flexible screens with small bend radii, the metal wire in the SD (metal wire) is subjected to significant bending strain, leading to cracking and display abnormalities.
Innovation Solution
A display module design that includes a display panel with a bending area where a first back film layer and a second back film layer are arranged to create gaps between the bending start and end positions, and a polarizer and limiting support layer are used to define these positions, reducing strain on the metal wire by controlling the bending morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bend radius is reduced to achieve full-screen display, then the display area is increased, but the bending strain on metal wire increases significantly causing cracking
Solution Approach 1:
The bending area is divided into multiple layers including first and second back film layers, support structures, and buffer layers. Each layer is segmented with specific gaps and positions to distribute and reduce bending strain on the metal wire, preventing cracking while maintaining small bend radius for full-screen display
Solution Approach 2:
The first back film layer is positioned with a gap from the bending start position, and the second back film layer is positioned with a gap from the bending end position. These pre-positioned layers provide cushioning and strain distribution before the metal wire undergoes bending, preventing cracking in advance
2Reliability
If the bending strain is reduced to prevent metal wire cracking, then the metal wire integrity is improved, but the bending morphology control becomes more difficult
Solution Approach 1:
Different layers are assigned different positions and functions within the bending area. The first back film layer is positioned away from the bending start position, the second back film layer is positioned away from the bending end position, and support structures are placed at specific locations. This local differentiation allows strain reduction while maintaining precise bending morphology control
3Reliability
If gaps are introduced between back film layers and bending positions to reduce strain, then the metal wire cracking is prevented, but the structural complexity increases
Solution Approach 1:
The patent uses multiple thin film layers (first back film layer, second back film layer, buffer layers) with specific gaps positioned in the bending area. These flexible thin films reduce bending strain on the metal wire through their gap configurations, preventing cracking while maintaining relatively simple manufacturing processes
Data Source
AI summary
Display module and device are disclosed. The display module includes a display area, a bonding area, a bending area, a support structure, and first and second back film layers; the bending area has a bending start position and a bending end position; the first back film layer has a first end adjacent to the bending area, the second back film layer has a fourth end adjacent to the bending area, there is a gap between the first end and the bending start position, and between the fourth end and the bending end position; a light-emitting side of the display area is provided with a polarizer, and the polarizer has a second end which is flush with the bending start position; and a third end of a limiting support layer is flush with the bending end position.