Multi-Layer Protective Insulation for Display Non-Display Area Short-Circuit Prevention
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Solution Overview
Problem
Organic light emitting display devices often experience short-circuits due to physical impact in non-display areas, where data power lines come into contact with gate power lines, leading to defective panel driving.
Innovation Solution
A display device design that includes a substrate with a non-display area featuring a gate metal line, a gate insulating layer, a data metal line, and multiple protective layers in regions where the gate and data metal lines overlap, preventing contact and short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single protective layer is used to insulate metal lines, then the manufacturing process is simple, but the protection against short-circuits under physical impact is insufficient
Solution Approach 1:
The protective layer is divided into multiple sub-layers (first protective layer, second protective layer, third protective layer) with different materials and functions. Each layer provides specific protection: the first layer prevents moisture penetration, the second layer provides mechanical strength, and the third layer offers additional insulation. This segmentation allows the structure to withstand physical impact better than a single layer while maintaining manufacturing feasibility through sequential deposition processes.
Solution Approach 2:
The patent employs composite material structure for the protective layers, combining different materials with complementary properties. The first protective layer uses inorganic material for moisture barrier, the second layer uses organic material for flexibility and adhesion, and the third layer uses inorganic material for hard protection. This composite approach enhances overall reliability against short-circuits while managing the complexity through standardized material selection and deposition techniques.
2Area of stationary object
If metal lines are arranged close together to reduce area, then the display device area is minimized, but the risk of short-circuit due to impact increases
Solution Approach 1:
The patent transitions from two-dimensional planar protection to three-dimensional multi-layer protection. By stacking multiple protective layers vertically above the metal lines, the solution provides enhanced protection against impact without increasing the horizontal footprint. This dimensional approach allows close spacing of metal lines in the plane while maintaining reliable short-circuit prevention through the vertical layer structure.
Solution Approach 2:
The multi-layer protective structure is formed beforehand during the manufacturing process, creating a cushioning barrier before the device is subjected to physical impact. The layers are deposited sequentially to build up protective thickness that absorbs and distributes impact forces, preventing direct contact between metal lines that would cause short-circuits. This preemptive protection is integrated into the fabrication process rather than added later.
Data Source
AI summary
A display device including a substrate including a display area and a non-display area, wherein the non-display area comprises a gate metal line positioned on the substrate, a gate insulating layer insulating the gate metal layer, a data metal line positioned on the gate insulating layer, and two or more protective layers positioned in a region in which the gate metal line and the data metal line overlap above the data metal line.