Touch Panel Heater Electrode Openings for UV Curing
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Solution Overview
Problem
The bonding strength between the cover lens and the sensing substrate in touch panels with heaters is reduced due to the opaque silver paste heating electrodes blocking ultraviolet light, which impedes the curing of optical adhesives, leading to abnormal display issues in low temperature environments.
Innovation Solution
The formation of openings in the heating electrodes allows ultraviolet light to penetrate, enhancing the curing of optical adhesives and improving the bonding strength between the cover lens and the sensing substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If opaque silver paste is used for heating electrodes, then heating function is achieved, but ultraviolet light penetration is blocked and optical adhesive curing is impaired
Solution Approach 1:
The heating electrode is segmented into multiple isolated conductive patterns instead of continuous opaque silver paste. This segmentation creates gaps between conductive regions, allowing ultraviolet light to penetrate through the electrode structure and cure the optical adhesive while maintaining heating functionality through the distributed conductive elements.
Solution Approach 2:
The heating electrode employs different material properties in different regions - conductive material for heating zones and transparent or gap regions for light transmission zones. This local differentiation enables simultaneous achievement of heating function and optical adhesive curing by optimizing each region's properties for its specific function.
2Power
If continuous opaque heating electrode is used, then heating efficiency is improved, but bonding strength of optical adhesive is reduced
Solution Approach 1:
The continuous opaque heating electrode is divided into multiple discrete conductive segments. These segments maintain sufficient total conductive area for effective heating while creating light transmission pathways that enable complete optical adhesive curing, thereby preserving bonding strength.
Solution Approach 2:
The heating electrode structure incorporates a porous or grid-like pattern with controlled transparency. This porous design allows ultraviolet light to pass through the electrode to cure the optical adhesive while the conductive material within the porous structure maintains heating efficiency through adequate surface area for electrical resistance heating.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The enhanced curing of optical adhesives results in improved bonding strength and product quality, addressing the issue of reduced bonding strength caused by opaque heating electrodes.
Implementation Method 1
By suppling power to the heating electrodes 103, the heating electrodes 103 generate heat to produce heating effects
Implementation Method 2
ultraviolet (UV) light is directionally irradiating from the lower surface of the sensing substrate 102 to the cover lens 100; thereafter, the optical adhesive 104 can be cured by the irradiating ultraviolet light to achieve the bonding effects
Data Source
AI summary
The present invention is a touch panel with a heater for enhancing the bonding of optical adhesive, which comprises a cover lens and a sensing substrate mutually bonded by optical adhesive, wherein at least one heating electrode is configured on the other side of the sensing substrate. The heating electrode is formed by printing an opaque conductive material with a plurality of openings formed thereon and through which light is allowed to pass. When ultraviolet light is irradiating from one side of the heating electrode to the direction of the cover lens, the ultraviolet light can penetrate the optical adhesives through the openings on the heating electrode, so that the optical adhesives are effectively cured by the irradiation, and the bonding strength between the cover lens and the sensing substrate is improved.