Capacitive Touch Screen DC Common Voltage Signal Layer Shielding
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Solution Overview
Problem
Conventional capacitive touch screens require a shielding layer to reduce noise interference, increasing manufacturing costs and reducing transmittance due to the additional layers, which complicates the manufacturing process and affects performance.
Innovation Solution
A capacitive touch sensing apparatus that eliminates the need for a shielding layer by using a DC common voltage signal layer for signal interference shielding, allowing the touch panel to operate without the shielding layer while maintaining accurate position signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding layer is added to reduce noise interference, then signal interference shielding is improved, but manufacturing cost increases and transmittance decreases
Solution Approach 1:
The patent extracts and eliminates the shielding layer from the touch panel structure by using a DC common voltage signal layer instead, which provides shielding functionality without requiring a separate physical shielding layer, thus reducing manufacturing complexity and improving transmittance
Solution Approach 2:
The DC common voltage signal layer serves multiple functions: it provides common voltage for the liquid crystal display and simultaneously acts as a shielding layer to reduce noise interference, eliminating the need for a separate shielding layer and simplifying the overall structure
2Object-affected harmful factors
If a shielding layer is added to reduce noise interference, then signal interference shielding is improved, but transmittance decreases
Solution Approach 1:
The patent removes the shielding layer from the touch panel structure and replaces it with a DC common voltage signal layer that provides shielding functionality electrically rather than physically, thereby maintaining high transmittance while still reducing noise interference
3Object-affected harmful factors
If a shielding layer is added to reduce noise interference, then signal interference shielding is improved, but manufacturing cost increases
Solution Approach 1:
The DC common voltage signal layer performs dual functions as both the common voltage source for liquid crystal control and the shielding layer for noise reduction, eliminating the need for a separate shielding layer and reducing manufacturing costs by simplifying the production process
Solution Approach 2:
The patent merges the common voltage signal layer and shielding layer into a single functional layer, combining two previously separate components into one, which reduces the number of manufacturing steps and lowers production costs
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
This solution reduces manufacturing costs, enhances transmittance, and ensures correct position signal output without the shielding layer, improving the overall performance and efficiency of the capacitive touch screen.
Implementation Method 1
a DC common voltage signal layer electrically connected with a DC voltage for shielding against signal interference
Implementation Method 2
a sensing layer deployed under the protecting layer for sensing a touch to generate a position signal
Data Source
AI summary
A capacitive touch screen sensing apparatus is provided. The apparatus includes a protecting layer; a sensing layer under the protecting layer for sensing a touch to generate a position signal; and a DC common voltage signal layer electrically connected with a DC voltage for shielding against signal interferences.