Touch Panel Shielding Layer Coplanar Conducting Bridges
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Solution Overview
Problem
Conventional capacitive touch panels with thin stacked structures face challenges in maintaining a sufficient signal-to-noise ratio due to the close proximity of touch sensing electrodes to the display device, leading to inaccurate touch signal judgment, and existing solutions that add insulating and shielding layers increase the device thickness, contradicting the trend towards thinner designs.
Innovation Solution
A touch panel structure featuring a dielectric layer, first and second sensing circuits with conducting bridges, and a shielding layer, where the shielding layer is coplanar with the conducting bridges and insulated from them, along with an adhesive layer and substrate, to enhance the signal-to-noise ratio while maintaining a thin profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the stacked touch structure is made thinner to meet market demand, then the device thickness is reduced, but the distance between the touch sensing electrodes and the display device becomes too small, resulting in a low signal-to-noise ratio
Solution Approach 1:
The patent divides the conductive layer into functionally distinct regions: shielding portions positioned adjacent to the sensing electrodes to block electromagnetic interference, and conducting bridge portions that electrically connect adjacent sensing electrodes. This segmentation allows the shielding function and electrical connection function to be performed separately within the same layer, effectively improving signal-to-noise ratio without requiring additional layers that would increase device thickness.
Solution Approach 2:
The conductive layer is designed to perform multiple functions simultaneously: it provides electromagnetic shielding for the sensing electrodes, establishes electrical connections between adjacent electrodes through the conducting bridges, and maintains the overall thin structure. This multi-functionality resolves the contradiction by eliminating the need for separate insulating and shielding layers, thus keeping the device thickness reduced while improving the signal-to-noise ratio.
2Measurement precision
If an insulating layer and a shielding layer are disposed between the sensing electrodes and the display device to improve the signal-to-noise ratio, then the signal quality is enhanced, but the total thickness of the touch device increases
Solution Approach 1:
The patent merges the shielding function and the electrical connection function into a single conductive layer, eliminating the need for separate insulating and shielding layers. The shielding portions and conducting bridge portions are integrated within the same layer, achieving both electromagnetic interference protection and electrical connectivity while maintaining a reduced device thickness.
Solution Approach 2:
The conductive layer serves multiple purposes: it acts as a shielding layer to block electromagnetic interference from the display device, provides conducting bridges to electrically connect adjacent sensing electrodes, and maintains the thin overall structure. This multi-functional design resolves the contradiction by achieving improved signal-to-noise ratio without the thickness penalty of multiple separate layers.
Data Source
AI summary
The present disclosure provides a touch panel structure, including a display device, a dielectric layer, a first sensing circuit, a second sensing circuit and a shielding layer. The dielectric layer is disposed on the display device. The first sensing circuit includes a plurality of first sensing electrodes and a plurality of conducting bridges, wherein the first sensing electrodes are disposed on the dielectric layer, and the conducting bridges are disposed between the dielectric layer and the display device. Adjacent ones of the first sensing electrodes are electrically connected with each other through one of the conducting bridges. The second sensing circuit includes a plurality of second sensing electrodes, which are disposed on the dielectric layer. The second sensing circuit is insulated from and crosses the first sensing circuit. The shielding layer is disposed between the dielectric layer and the display device and coplanar with the conducting bridges.