Touch Display Panel Insulation Layer Via Hole Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In touch display panels, incomplete etching during the manufacturing process can lead to poor contact between the touch layer and the signal transmission layer due to thickness fluctuations in the film layers, affecting the touch control function.
Innovation Solution
A touch display panel design featuring a signal transmission layer, an insulation layer with a concave-convex structure, and a touch layer, where the insulation layer's second concave-convex structure overlaps the first concave-convex structure, facilitating a connection via hole that penetrates the second connecting portion to establish electrical connection despite process fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the film layer thickness is increased to improve insulation performance, then the insulation effect is enhanced, but the etching completeness deteriorates leading to poor contact between layers
Solution Approach 1:
The insulation layer is segmented into multiple portions (first insulation layer portion, second insulation layer portion, third insulation layer portion) with different thicknesses. The first portion has greater thickness for enhanced insulation, while the second and third portions have reduced thickness to enable complete etching and ensure proper contact between the touch layer and signal transmission layer, thus resolving the contradiction between insulation performance and etching completeness.
Solution Approach 2:
Different regions of the insulation layer are assigned different thicknesses according to local requirements. The first insulation layer portion maintains greater thickness in areas requiring strong insulation, while the second and third portions are thinned in areas where etching must penetrate through to establish electrical connections, achieving both insulation effectiveness and manufacturing feasibility.
2Adaptability or versatility
If the film layer thickness fluctuates due to process variations, then manufacturing flexibility is maintained, but the electrical connection reliability deteriorates
Solution Approach 1:
The insulation layer thickness is designed dynamically with varying thicknesses in different portions. This dynamic structure accommodates process thickness fluctuations by ensuring that at least the second and third portions remain thin enough for complete etching penetration, thereby maintaining electrical connection reliability despite variations in the first portion's thickness.
Solution Approach 2:
The insulation layer is pre-designed with thickness variations before the etching process. The second and third portions are intentionally made thinner in advance, ensuring that even with process fluctuations affecting the overall layer thickness, the etching can always penetrate completely through these portions to establish reliable electrical connections.
Data Source
AI summary
Provided a touch display panel includes a signal transmission layer, an insulation layer, and a touch layer disposed in stack. A surface of the signal transmission layer is provided with first concave-convex structure. The insulation layer covers the first concave-convex structure, and a surface thereof is provided with a second concave-convex structure at least partially overlapping the first concave-convex structure in a light exit direction. The second concave-convex structure includes a second convex portion, a second concave portion, and a second connecting portion, thickness of the second connecting portion smaller than either thickness of the second convex portion or thickness of the second concave portion. A connection via hole is further provided, penetrates at least the second connecting portion, exposes part of the signal transmission layer, and the touch layer electrically connected to the signal transmission layer through the connection via hole.