Display Panel Insulating Layer Adhesion via Segmented Sub-layers
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Solution Overview
Problem
In display panels, the adhesion force between metal layers and insulating layers is weak, leading to peeling off and wire breakage during etching, particularly at slope positions where the silicon oxide insulating layer contacts metal layers.
Innovation Solution
A display panel design featuring a protruding insulating layer with a first sub-layer and a second sub-layer in layers, where the second signal transmission portion extends into holes in the sidewall and top surface of the protruding portion, enhancing adhesion with a silicon nitride sub-layer, thereby improving the adhesion force and reducing wire breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a gate insulating layer is provided between the metal layer and gate electrode for space insulation, then insulation is achieved, but the adhesion force between the gate insulating layer and metal layer becomes relatively small, causing peeling off at the slope
Solution Approach 1:
The gate insulating layer is divided into multiple segments: a first gate insulating layer (silicon oxide) and a second gate insulating layer (silicon nitride) with different materials and adhesion properties. The silicon nitride layer provides strong adhesion to the metal layer, while the silicon oxide layer provides good insulation, thus resolving the contradiction between insulation and adhesion force.
Solution Approach 2:
The gate insulating layer uses a composite structure combining silicon oxide and silicon nitride materials. Each material contributes its advantageous properties: silicon oxide for insulation and silicon nitride for adhesion, achieving both good insulation and strong adhesion simultaneously.
2Stability of the object's composition
If the metal layer forms a slope at the overlap position with the gate electrode, then space insulation is achieved, but the metal layer and silicon oxide layer are prone to peel off at the slope, resulting in wire breakage during etching
Solution Approach 1:
The second gate insulating layer (silicon nitride) is formed beforehand to provide strong adhesion at the slope position before the metal layer is deposited. This preliminary adhesion layer prevents peeling during subsequent etching processes, ensuring wire integrity while maintaining the necessary slope for space insulation.
Solution Approach 2:
The silicon nitride layer acts as an intermediary between the metal layer and the silicon oxide layer. It provides strong adhesion to the metal layer while allowing the silicon oxide layer to maintain its insulation function, thus preventing peeling and wire breakage at the slope position.
3Ease of manufacture
If a single-layer insulating structure is used, then manufacturing is simpler, but adhesion force is insufficient leading to peeling off
Solution Approach 1:
The insulating layer is segmented into multiple sub-layers with different functions. The first sub-layer (silicon oxide) provides insulation and the second sub-layer (silicon nitride) provides adhesion. This segmentation achieves both good adhesion and insulation without significantly complicating the manufacturing process.
Data Source
AI summary
A display panel and a display device are provided, wherein an insulating layer covers a substrate and a first metal layer, and wherein the insulating layer includes a protruding portion covering a first signal transmission portion. A second metal layer is disposed on a side of the insulating layer away from the first metal layer and includes a second signal transmission portion, wherein the second signal transmission portion covers at least part of a sidewall of the protruding portion. The protruding portion includes a first sub-layer, a second sub-layer, and a first hole arranged at a sidewall of the protruding portion, wherein the first sub-layer is positioned on a side of the second sub-layer away from the first signal transmission portion, and wherein the second signal transmission portion extends into the first hole and contacts the second sub-layer.