Flexible Display Substrate Interlayer Structure for Bending Resistance
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Solution Overview
Problem
Conventional AMOLED display substrates have limited bending resistance due to the use of inorganic interlayer insulation layers, leading to issues such as poor encapsulation, breakdown, and burning of routing wires, which restricts the flexibility and yield of flexible display products.
Innovation Solution
A display substrate with an improved interlayer insulation layer structure that includes a combination of organic and inorganic insulation layers, where the organic layer covers the display area and part of the non-display area, and the inorganic layer surrounds the organic layer, enhancing bending resistance and preventing water vapor ingress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an inorganic interlayer insulation layer is used, then manufacturing precision is improved, but bending resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining organic and inorganic insulation layers in an interlayer structure. The organic layer provides flexibility and bending resistance, while the inorganic layer maintains encapsulation quality and prevents water vapor ingress, resolving the contradiction between manufacturing precision and bending resistance.
Solution Approach 2:
The patent applies local quality by using different material properties in different regions of the interlayer structure. The organic insulation layer is used where bending flexibility is needed, while the inorganic insulation layer is used where encapsulation and water vapor barrier properties are critical, thus locally optimizing both bending resistance and manufacturing precision.
2Adaptability or versatility
If a flexible structure is implemented, then adaptability is improved, but reliability deteriorates due to routing wire breakdown
Solution Approach 1:
The composite interlayer structure of organic and inorganic materials provides both flexibility for bending and reliable protection for routing wires. The organic layer accommodates bending stresses while the inorganic layer prevents water vapor ingress that could cause wire breakdown, thus maintaining reliability in flexible structures.
Solution Approach 2:
The organic insulation layer acts as a cushioning layer that absorbs and distributes bending stresses before they reach the routing wires. This beforehand cushioning prevents stress concentration and potential wire breakdown, maintaining reliability while enabling flexibility.
3Adaptability or versatility
If bending range is increased, then adaptability is improved, but harmful factors increase due to water vapor ingress
Solution Approach 1:
The composite structure combines the flexibility of organic materials with the water vapor barrier properties of inorganic materials. This allows the display substrate to achieve a larger bending range while the inorganic layer simultaneously prevents water vapor ingress, resolving the contradiction between adaptability and harmful factors.
Solution Approach 2:
The inorganic insulation layer is strategically positioned to provide water vapor barrier protection in areas most susceptible to moisture ingress during bending, while the organic layer provides the necessary flexibility. This local optimization allows increased bending range without compromising against water vapor harmful factors.
Data Source
AI summary
The present application relates to the technical field of display. Disclosed are a display substrate and a preparation method therefor, and a display panel, which aim at improving the bending resistance of a flexible display panel, and increasing the yield of a flexible display product. The display substrate comprises: a base substrate provided with a display area and a non-display area surrounding the display area; a gate layer located on the base substrate; an interlayer insulation layer, which is located on the side of the gate layer that faces away from the base substrate and comprises a first organic insulation layer and a first inorganic insulation layer, wherein the first organic insulation layer covers the display area and part of the non-display area; a source and drain layer located on the side of the interlayer insulation layer that faces away from the base substrate.