Touch Screen Panel With Flush Insulating Member To Reduce Step Differences
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Solution Overview
Problem
Touch screen panels integrated with windows face challenges such as step differences caused by black matrices, leading to bubble generation and increased complexity and thickness in display devices.
Innovation Solution
A touch screen panel design featuring an opaque peripheral pattern as a black matrix, with an insulating member of equal height positioned on the same layer as the peripheral pattern, and conductive sensing cells connected by peripheral wirings, which are formed on the substrate to reduce step differences and simplify the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is formed on the window substrate to prevent peripheral wirings from being visible, then the visibility of wirings is improved, but a step difference is caused leading to bubble generation during attaching
Solution Approach 1:
An insulating member is introduced as an intermediary element between the black matrix and the conductive sensing cells. This insulating member has the same height as the black matrix, creating a smooth transition surface that eliminates step differences and prevents bubble generation during the attaching process, while the black matrix continues to hide the peripheral wirings effectively
Solution Approach 2:
The height parameter of the insulating member is specifically designed to match the height of the black matrix. By changing and equalizing this dimensional parameter, the surface becomes flush and free of steps, thereby preventing bubbles during attaching while maintaining the optical hiding function of the black matrix
2Reliability
If separate substrates are provided for the touch screen panel and window, then the touch sensing function is achieved, but the structure becomes complex and thickness increases
Solution Approach 1:
The window substrate and touch screen panel substrate are merged into a single integrated substrate. The black matrix, insulating member, conductive sensing cells, and peripheral wirings are all formed on this unified substrate, eliminating the need for separate substrates and reducing overall structural complexity and thickness while maintaining touch sensing functionality
Data Source
AI summary
A touch screen panel includes: a substrate; an opaque peripheral pattern formed on one surface of a non active area of the substrate; an insulating member disposed on an active area of inside of the peripheral pattern so as to be positioned on a same layer as the peripheral pattern; conductive sensing cells formed on the insulating member; and peripheral wirings connected to the conductive sensing cells and formed on the peripheral pattern.