Display Device Insulating Layer Thickness Variation
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Solution Overview
Problem
Display devices face challenges in optimizing the thickness of insulating layers to ensure sufficient capacitance for proper functioning while preventing vertical short circuits between connection lines, which affects the performance and reliability of the display.
Innovation Solution
The display device incorporates an insulating layer with varying thickness portions, where the first portion is less than 1200 Å and the second portion is greater than or equal to 2000 Å, and connection lines are formed on different layers with specific materials and orientations to cross each other, ensuring adequate capacitance and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating layer thickness is increased to prevent vertical short circuits between connection lines, then the reliability of the display device is improved, but the capacitance of the storage capacitor decreases affecting display function
Solution Approach 1:
The insulating layer is designed with different thicknesses in different regions: a first thickness in the display area sufficient for storage capacitor capacitance, and a second greater thickness in the non-display area where connection lines cross, preventing short circuits while maintaining display functionality
Solution Approach 2:
The insulating layer is segmented into multiple portions with different thicknesses based on functional requirements of different areas, allowing optimization of both capacitance and short circuit prevention in respective regions
2Ease of manufacture
If connection lines are formed on the same layer to simplify manufacturing, then the ease of manufacture is improved, but the risk of vertical short circuits increases affecting reliability
Solution Approach 1:
Connection lines are distributed across multiple layers vertically, with the first connection line on the first layer and the second connection line on the second layer, eliminating the risk of short circuits while maintaining manufacturing feasibility through standard multi-layer fabrication processes
Data Source
AI summary
A display device is disclosed. In one aspect, the device includes a substrate including a display area displaying an image via a plurality of pixels and a non-display area adjacent to the display area. The device also includes a first line and a second line in the display area. The display device also includes a first connection line and a second connection line in the non-display area, wherein the first and second connection lines are respectively connected to the first and second lines and extend in different directions to cross each other. The display device also includes an insulating layer formed over the substrate and including a first portion and a second portion, the first portion corresponding to the display area and the second portion corresponds to a crossing area where the first and second connection lines cross each other, the thickness of the first and second portions are different.