Display Bending-Area Protection Lines for Wiring Crack Prevention
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Solution Overview
Problem
Display apparatuses experience cracks in wiring lines due to bending, which affect reliability and performance.
Innovation Solution
Incorporation of protection lines in the bending area of the display apparatus, connected to the driving integrated circuit and supplied with a lower voltage than the signal lines, to mitigate stress and prevent cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display apparatus is bent to reduce bezel width and improve aesthetics, then the compactness and visual appearance are improved, but cracks are generated in the wiring lines disposed in the bending area, affecting reliability
Solution Approach 1:
A protection line is introduced as an intermediary element between the driving integrated circuit and the signal lines in the bending area. This protection line acts as a mediator that absorbs or distributes the stress generated during bending, preventing direct stress transmission to the signal lines and thereby preventing cracks while allowing the display to achieve reduced bezel width through bending
2Reliability
If protection lines are added to prevent cracks in wiring lines, then the reliability is improved, but the device complexity increases due to additional wiring structures
Solution Approach 1:
The protection line is supplied with a voltage lower than the voltage supplied to the signal lines. This parameter change (voltage level differentiation) allows the protection line to fulfill its stress-protection function while maintaining electrical compatibility with the existing driving circuitry, thereby improving reliability without significantly increasing device complexity
3Power
If the wiring lines are supplied with high voltage for proper operation, then the driving performance is improved, but the stress on wiring lines in the bending area increases, leading to cracks
Solution Approach 1:
The protection line serves as a stress-distributing intermediary that is supplied with a lower voltage. This lower voltage supply to the protection line reduces the electrostatic stress and mechanical tension on the wiring structure in the bending area, allowing the signal lines to operate at high voltage for proper driving performance while the protection line mitigates the resulting stress concentration that would otherwise cause cracks
Data Source
AI summary
A display apparatus includes a substrate including an active area and a non-active area including a bending area and a pad area; a gate driver disposed in the non-active area; a driving integrated circuit disposed in the pad area; a plurality of signal lines disposed in the bending area and connecting the driving integrated circuit and the gate driver; and at least one protection line disposed at an end in a width direction of the bending area, wherein one end of the at least one protection line is connected to the driving integrated circuit.