OLED Array Substrate Bending Region Barrier Layer Design
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Solution Overview
Problem
Existing display devices face issues with electrical performance of signal lines due to water and oxygen permeation through organic photoresist in the bending region, affecting durability and functionality.
Innovation Solution
Incorporating a water- and oxygen-resistant layer on the flexible substrate, with a signal line layer and flattening layer patterned to form signal transmission lines, and utilizing barrier and buffer layers to create slots that are filled by the flattening layer, enhancing the barrier properties in both first and second bending regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic layers are removed entirely to form openings filled by organic photoresist to increase bending durability, then bending durability is improved, but water and oxygen permeation through the organic photoresist degrades electrical performance of signal lines
Solution Approach 1:
The patent introduces an organic protective layer as an intermediary between the organic photoresist and the signal line layer. This protective layer acts as a barrier that prevents water and oxygen from the flexible substrate from permeating through the organic photoresist to reach and damage the signal line layer, while allowing the bending region to maintain its flexibility and durability.
Solution Approach 2:
The patent creates a composite structure in the bending region by combining multiple layers: the flexible substrate, organic photoresist, organic protective layer, and signal line layer. This composite structure leverages the complementary properties of each layer - the flexibility of the substrate, the patterning capability of the photoresist, the protective barrier properties of the organic protective layer, and the electrical functionality of the signal line layer.
2Reliability
If a water- and oxygen-resistant layer is added to prevent permeation, then electrical performance is improved, but device complexity increases
Solution Approach 1:
The patent changes the material parameters of the protective layer by using an organic material with specific water and oxygen barrier properties. The organic protective layer is designed with appropriate thickness and compositional characteristics to provide effective protection against permeation while maintaining compatibility with the existing manufacturing process and overall device architecture.
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 configuration effectively prevents water and oxygen from reaching the signal line layer, thereby improving the electrical performance and durability of signal lines by creating a robust barrier against permeation.
Implementation Method 1
a water- and oxygen-resistant layer, formed on the flexible substrate
Data Source
AI summary
Array substrate, an organic light emitting diode (OLED) display panel and a display device are provided with a flexible substrate, an water- and oxygen-resistant layer, a signal line layer and a flattening layer that are laminated in a bending region of the array substrate, signal transmission lines formed by patterning the signal line layer are formed on the water- and oxygen-resistant layer. By manufacturing the signal line layer of the bending region on the water- and oxygen-resistant layer and filling with the flattening layer, the problem of electrical performance of signal lines, caused by water and oxygen permeating the signal line layer through organic photoresist, is alleviated.