Touch Display Panel Border Reduction via Retaining Wall Routing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch display panels face issues with wide borders due to the need for touch electrodes to exceed the display area, leading to increased risk of electrode wire breaking and short circuits.
Innovation Solution
A touch display panel design with retaining walls of 30-200 μm width and a height difference of 0-3 μm between the retaining wall and the thin film encapsulation layer, allowing electrode wires to be arranged along the retaining wall's extension direction, thereby reducing the border area and minimizing the risk of wire breaking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch electrodes are formed to exceed the display area by about 0.5 mm to ensure touch performance at the edge, then the touch performance at the edge is improved, but the border width becomes very wide
Solution Approach 1:
The patent transitions from a planar arrangement where touch electrodes extend beyond the display area to a three-dimensional arrangement where electrodes are positioned within the display area but elevated above the substrate surface. This vertical dimensionality change allows the thin film encapsulation layer to bridge between the elevated electrodes and the substrate, eliminating the need for wide borders while maintaining edge touch performance.
2Ease of manufacture
If touch electrode wires are made to cross retaining walls with larger height difference, then the electrode wires can be positioned between retaining walls, but the risk of wire breaking increases
Solution Approach 1:
The patent changes the height parameter of the thin film encapsulation layer to match the retaining wall height, creating a height difference of 0-3 μm. This parameter adjustment eliminates large height differences that cause wire breaking, while still allowing electrode wires to be positioned between retaining walls for ease of manufacture.
3Strength
If the width of retaining wall is increased to accommodate electrode wires, then the structural support is improved, but the border area increases
Solution Approach 1:
The patent applies local quality by making the retaining walls narrow (30-200 μm width) only where needed for structural support and electrode wire routing, while the thin film encapsulation layer provides the necessary structural support and protection in the border area. This localized approach maintains strength where required while minimizing overall border area.
Data Source
AI summary
A touch display panel and a touch display apparatus are provided. The touch display panel includes: a substrate; an organic light emitting device; at least one retaining wall, the width of which is 30˜200 μm; a thin film encapsulation layer covering the retaining wall, and a height difference between a first retaining wall and a part of the thin film encapsulation layer located between the first retaining wall and a display area is 0˜3 μm; and electrode wires, at least a part of at least one of the electrode wires is located at least in non-display areas of the substrate, is located at a side, which is facing away from the retaining wall, of the thin film encapsulation layer, and is arranged along an extension direction of the retaining wall, and projections of the electrode wires on the substrate are located within a projection of the retaining wall on the substrate.