Flexible Display Interlayer Insulating Layer Segmentation
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Solution Overview
Problem
The thick interlayer insulating layer in flexible display devices is prone to cracking and crack propagation under bending stress, leading to thin film transistor device failure.
Innovation Solution
A flexible display device design featuring a flexible substrate with an interlayer insulating layer having channels that penetrate its edges, allowing the second metal layer to project vertically and form insulating channels, which divide the interlayer into trapezoidal sections, reducing the thickness and increasing flexibility, and using source/drain metal traces as etching masks to form channels without additional masks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thick interlayer insulating layer is used to achieve good insulation properties and hydrogen replenishing effect, then insulation performance is improved, but the layer is prone to crack and crack propagation under bending stress
Solution Approach 1:
The interlayer insulating layer is divided into multiple sections by introducing channels that penetrate through the layer. This segmentation reduces the continuous thickness of the insulating material, allowing it to flex without cracking while maintaining insulation performance through the distributed structure of insulating segments.
Solution Approach 2:
The interlayer insulating layer is designed with a porous structure containing channels that extend through the layer. These channels create a three-dimensional network that maintains insulation properties while providing flexibility and preventing crack propagation under bending stress.
2Reliability
If a thick interlayer insulating layer is used to provide hydrogen atoms for active layer, then defect repair capability is improved, but flexibility of the display device deteriorates
Solution Approach 1:
The insulating layer is segmented into insulating sections separated by channels, maintaining the necessary hydrogen-containing material volume for defect repair while creating a flexible, non-continuous structure that adapts to bending without cracking.
Solution Approach 2:
The channels are strategically positioned to create local variations in the insulating layer structure. The insulating sections between channels maintain hydrogen replenishment capability while the channel regions provide flexibility and stress relief, achieving different properties in different local areas.
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 enhances the display device's reliability under bending stress by concentrating deformation in the channels, preventing interlayer cracking and improving insulation while reducing manufacturing costs.
Implementation Method 1
concentrating deformation in the channels, preventing interlayer cracking
Implementation Method 2
using source/drain metal traces as etching masks to form channels
Data Source
AI summary
A flexible display device is provided. The flexible display device comprises a flexible substrate on which an active layer, a gate insulating layer, a gate metal layer, an interlayer insulating layer, a second metal layer, a planar layer, an emitting layer and an encapsulation layer are sequentially stacked. The gate insulating layer covers the active layer, the interlayer insulating layer covers the gate metal layer and the planar layer covers the interlayer insulating layer and the second metal layer. A plurality of channels is disposed on the interlayer insulating layer, and both two ends of the channels extending toward edge of the interlayer insulating layer to penetrate the interlayer insulating layer.