Light Shielding Layer Electrical Connection for AMOLED Corrosion Prevention
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Solution Overview
Problem
Active matrix organic light emitting diodes (AMOLED) display products face packaging failures due to corrosion of metal layers in grooves, leading to water-oxygen channel formation and Growing Dark Spots (GDS), which affect display performance and reliability.
Innovation Solution
A display substrate design featuring a base substrate with a light shielding layer, insulating layers, and a metal layer stacked in sequence, where the second insulating layer forms a barrier structure, and the light shielding layer connects signal lines and connection terminals through a connection lead, preventing corrosion and water-oxygen channel formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the first metal layer is exposed in the groove area without insulating layer protection, then the electrical connection is simplified, but the metal layer becomes susceptible to corrosion and water-oxygen channel formation
Solution Approach 1:
The patent applies local quality by selectively positioning the first insulating layer to cover only the connection lead in the groove area, while leaving other metal layer regions exposed. This localized insulation approach protects critical areas from corrosion without unnecessarily complicating the overall structure, thus resolving the contradiction between structural simplicity and packaging reliability.
2Reliability
If the connection lead is made thicker to reduce resistance, then the electrical connection reliability improves, but the light shielding performance deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness of the connection lead within a specific range (50-200 nm) to balance electrical resistance and light shielding performance. By adjusting this critical parameter, the invention achieves both reliable electrical connection and adequate light shielding without compromising either function.
3Reliability
If the first insulating layer covers the entire first metal layer, then the corrosion protection is maximized, but the area without insulating layer protection increases the risk of water-oxygen channel formation
Solution Approach 1:
The patent applies local quality by selectively positioning the first insulating layer to cover only the connection lead in the groove area, while leaving other metal layer regions exposed. This localized insulation approach protects critical areas from corrosion without creating continuous exposed areas that could form water-oxygen channels, thus resolving the contradiction between corrosion protection and preventing harmful factor formation.
Data Source
AI summary
A display substrate, a method of forming the same and a display device are provided. The display substrate includes: a base substrate, and a light shielding layer, a first insulating layer, a first metal layer, a second insulating layer and a light emitting device stacked in sequence on the base substrate; where the second insulating layer has a first groove and a second groove, and a portion of the second insulating layer between the first groove and the second groove forms a barrier structure; the first groove is at a side of the barrier structure adjacent to the light emitting device with respect to the second groove; the first metal layer includes a signal line at a side of the first groove away from the barrier structure and a connection terminal at a side of the second groove away from the barrier structure; the light shielding layer includes a connection lead through which the signal line and the connection terminal are electrically connected.