Overlapping Protective Layers for Display Device Wiring Reliability
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Solution Overview
Problem
The challenge in manufacturing portable display devices is the disconnection of wirings due to steps in each layer, which increases process steps and time, necessitating a solution to reinforce bent portions without prolonging the manufacturing process.
Innovation Solution
A display device design featuring overlapping first and second protective layers with different materials, arranged in specific directions and shapes to reinforce bent portions, and a method of manufacturing involving photoresist patterns to form these layers efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate processes are used to manufacture various protective layers, then the wiring disconnection due to steps in each layer can be prevented, but the process steps and process time increase
Solution Approach 1:
The patent combines multiple protective layers into a single integrated structure where different protective layers are formed in different regions of the same substrate during the same manufacturing process. This merging approach maintains the reliability benefits of multiple layers while eliminating the time penalty of sequential processing.
Solution Approach 2:
The patent segments the protective layer structure by region rather than by process step. Different protective layers are assigned to different regions (display area vs. peripheral area) of the substrate, allowing simultaneous formation of all protective layers in a single manufacturing cycle, thus preventing wiring disconnection without increasing process time.
2Reliability
If multiple protective layers are formed to reinforce bent portions, then wiring disconnection is prevented, but the device complexity increases
Solution Approach 1:
The patent applies local quality by providing different protective layers in different regions of the substrate. The first protective layer is provided in the display area while the second protective layer is provided in the peripheral area, allowing each region to have optimized protection without requiring complex multi-layer structures throughout the entire device.
Solution Approach 2:
The patent resolves complexity by transitioning from a vertical stacking approach (multiple layers throughout) to a horizontal differentiation approach (different layers in different regions). This spatial arrangement in the planar dimension simplifies the overall structure while maintaining the protective function in bent portions.
Data Source
AI summary
A display device includes: a substrate; a display area on the substrate, where the display area includes a plurality of pixels; a peripheral area on the substrate, where the peripheral area is on a periphery of the display area; a first protective layer on the substrate, where the first protective layer is in the display area and the peripheral area; and a second protective layer on the substrate, where the second protective layer is in the display area and the peripheral area. The first protective layer and the second protective layer overlap each other.