Touch Screen Panel Insulating Layer Scratch Prevention
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Solution Overview
Problem
Touch screen panels using the electrostatic capacity method are prone to scratches and defects at the intersections of coupling patterns, leading to potential short circuits and operational defects during manufacturing or handling.
Innovation Solution
A touch screen panel design featuring a transparent substrate with first and second sensing cells intersected by coupling patterns, where an insulating layer with a concave part and a protruding part is placed between the coupling patterns, ensuring the protruding part's height is greater than the combined height of the concave part and the second coupling patterns, thereby preventing scratches and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If first coupling patterns and second coupling patterns are formed with fine patterns and lamination structure, then the touch screen panel can detect contact position coordinates accurately, but step differences occur at intersections making the panel prone to scratches and defects
Solution Approach 1:
The patent applies preliminary action by forming a protective coating layer over the coupling patterns before final assembly. This coating layer is applied in advance to protect the fine patterns from scratches during manufacturing and handling, preventing damage before it occurs rather than addressing it after
Solution Approach 2:
The patent implements beforehand cushioning by introducing a protective coating layer that acts as a cushioning barrier between external forces and the vulnerable coupling patterns. This coating absorbs and distributes mechanical stresses, preventing scratches at intersection points before they can occur
2Reliability
If insulating layer is disposed between first coupling patterns and second coupling patterns at intersections, then electrical insulation is achieved, but step differences and scratch susceptibility increase
Solution Approach 1:
The patent merges multiple functions into the protective coating layer: it provides electrical insulation, reduces step differences through planarization, and prevents scratches. By combining these functions into a single integrated layer, the overall device complexity is reduced while maintaining all necessary functions
Solution Approach 2:
The protective coating layer serves multiple purposes simultaneously: electrical insulation, mechanical protection against scratches, and surface planarization. This multi-functional approach eliminates the need for separate layers for each function, simplifying the overall structure
3Ease of manufacture
If fine coupling patterns are used to couple sensing cells, then sensing cell connectivity is achieved, but the patterns become vulnerable to damage during manufacturing and handling
Solution Approach 1:
The protective coating is applied beforehand to cushion and protect the fine coupling patterns from mechanical damage during subsequent manufacturing steps and handling. This pre-applied protection allows the fine patterns to be formed without compromising their vulnerability
4Reliability
If lamination structure is used for coupling patterns, then electrical connectivity is achieved, but step differences create scratch-prone areas
Solution Approach 1:
The protective coating layer is applied preliminarily to fill and planarize the step differences created by the lamination structure. This pre-planarization ensures a flat surface before final assembly, eliminating scratch-prone areas while maintaining the underlying electrical connectivity
Data Source
AI summary
A touch screen panel in which an occurrence of a scratch at intersections of coupling patterns respectively coupling first sensing cells and second sensing cells to each other in a first direction and in a second direction is prevented. The touch screen panel includes a transparent substrate, sensing patterns formed on a surface of the transparent substrate. The sensing patterns include first sensing cells disposed along a first direction, second sensing cells disposed between the first sensing cells along a second direction intersecting the first direction, first coupling patterns coupling the first sensing cells to each other in the first direction, second coupling patterns coupling the second sensing cells to each other in the second direction, and an insulating layer disposed between the first coupling patterns and the second coupling patterns at intersections of the first coupling patterns and the second coupling patterns. The insulating layer includes a concave part formed below the second coupling patterns in an area where the first coupling patterns and the second coupling patterns intersect and a protruding part positioned around the concave part so as to have a height higher than the concave part.