Flexible Display Panel Neutral-Layer Wiring for Narrow-Bezel Bending
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Solution Overview
Problem
The challenge in display panel manufacturing is to achieve a narrow bezel and large screen design while ensuring reliable bending performance of metal wirings in the bending region, as existing technologies face issues with stress and breakage of metal wirings due to small bending radii and high stress concentrations.
Innovation Solution
A display panel design featuring a base substrate with stacked first and second flexible substrates, where the second wiring is positioned at a neutral layer in the bending region, reducing stress and improving reliability by using a buffer layer and specific wiring configurations, and employing a thinner second flexible substrate with a smaller elastic modulus to maintain structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bending region is used to reduce the non-display part area and increase screen ratio, then the visual experience is improved, but the metal wirings in the bending region experience high stress and may break
Solution Approach 1:
The patent positions the second wiring in the bending region at a specific depth between the first and second flexible substrates, creating a three-dimensional spatial arrangement. This vertical positioning places the wiring at the neutral layer during bending, where stress is minimized, thus resolving the contradiction between achieving small bending radius (for narrow bezel) and maintaining wiring reliability.
Solution Approach 2:
The patent changes the physical parameters of the second flexible substrate by making it thinner and using a material with smaller elastic modulus compared to the first flexible substrate. This parameter adjustment ensures that the neutral layer during bending is positioned at the location of the second wiring, minimizing stress on the wiring while enabling small bending radius for narrow bezel design.
2Length of moving object
If a smaller bending radius is used to achieve narrower bezel, then the screen ratio is increased, but the stress concentration on metal wirings increases
Solution Approach 1:
The patent utilizes the third dimension (depth) by positioning the second wiring at a specific vertical location between the two flexible substrates. This spatial arrangement ensures that during bending, the wiring resides at the neutral layer where stress is minimal, allowing small bending radius without excessive stress concentration.
Solution Approach 2:
The patent adjusts the thickness and elastic modulus parameters of the flexible substrates to control the position of the neutral layer during bending. By making the second substrate thinner with smaller elastic modulus, the neutral layer is positioned at the second wiring location, enabling small bending radius while maintaining low stress levels.
3Stress or pressure
If the second flexible substrate is made thinner with smaller elastic modulus, then the wiring stress is reduced, but the structural integrity may be compromised
Solution Approach 1:
The patent creates a composite structure with two different flexible substrates having different thicknesses and elastic moduli. The first substrate provides overall structural support and protection, while the thinner second substrate with smaller elastic modulus creates the desired stress distribution for the wiring, achieving both low wiring stress and maintained structural integrity through the composite arrangement.
Solution Approach 2:
The patent divides the flexible substrate structure into two separate layers with different properties. The first flexible substrate serves as a protective outer layer, while the second flexible substrate serves as the functional layer containing the wiring at the neutral position. This segmentation allows each layer to be optimized for its specific function without compromising overall integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design reduces the risk of wiring breakage and enhances the production yield by minimizing stress on the second wiring, allowing for smaller bending radii and more reliable bending performance, thus achieving a narrower bezel and larger screen effectively.
Implementation Method 1
the at least one second wiring is at a position of a neutral layer in the bending region when the bending region is in a bending state
Implementation Method 2
the base substrate further comprises a buffer layer between the first flexible substrate and the second flexible substrate, the buffer layer includes a first hollow part at least partially in the bending region
Implementation Method 3
the base substrate comprises a first flexible substrate and a second flexible substrate stacked on each other
Data Source
AI summary
A display panel is provided, including a display region and a bending region at a side of the display region, a base substrate the base substrate includes a first flexible substrate and a second flexible substrate stacked on each other; the display region includes a driver circuit layer, the driver circuit layer is at a side of the second flexible substrate away from the first flexible substrate and includes at least one first wiring, the bending region includes at least one second wiring, and the at least one second wiring is electrically connected with the at least one first wiring; the at least one second wiring is between the first flexible substrate and the second flexible substrate. The display panel has high reliability, narrow bezel, and large screen.