Touch Window Electrode Connection via Intermediate Buffer Layer
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Solution Overview
Problem
Existing touch windows face challenges in reducing thickness and maintaining adhesive strength due to step differences between dielectric layers and substrates, leading to reduced display areas and increased bonding widths of connection electrodes.
Innovation Solution
A touch window design featuring a substrate with a sensing electrode on the substrate and a second sensing electrode on an intermediate layer, connected by a connection electrode on the intermediate layer, which reduces the bonding width and eliminates step differences, allowing for increased display area and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If an intermediate layer is provided on the substrate to directly form electrodes, then the thickness of the touch window is reduced, but the adhesive strengths of connection electrodes are degraded due to step difference
Solution Approach 1:
A buffer layer is introduced as an intermediary component between the intermediate layer and the substrate. This buffer layer has a refractive index between that of the intermediate layer and the substrate, serving as a mediator to gradually transition the refractive index and reduce the step difference effect, thereby maintaining adhesive strength while preserving the thin-profile benefits
Solution Approach 2:
The refractive index parameter is changed by introducing a buffer layer with an intermediate refractive index value. This parameter change creates a gradual transition zone that reduces the optical and mechanical step difference between the intermediate layer and substrate, resolving the contradiction between reduced thickness and maintained adhesive strength
2Reliability
If the bonding areas of connection electrodes are increased to compensate for step difference, then adhesive strength is improved, but the display area is reduced
Solution Approach 1:
The buffer layer acts as a mediator that reduces the step difference between layers, allowing connection electrodes to maintain adequate adhesive strength with smaller bonding areas. This eliminates the need to expand bonding areas, thereby preserving display area while ensuring reliable electrode connections
Solution Approach 2:
By changing the refractive index parameter through the buffer layer, the optical and mechanical discontinuity is reduced, enabling connection electrodes to achieve sufficient adhesive strength without requiring increased bonding area, thus preventing display area reduction
Data Source
AI summary
A touch window includes a substrate comprising a first area and a second area, a wire electrode on the second area, an intermediate layer provided on the substrate to cover an end of the wire electrode, a sensing electrode on the intermediate layer, and a connection electrode to connect the sensing electrode with the wire electrode. The connection electrode is provided on the intermediate layer to connect the sensing electrode with the wire electrode.