Dual-Sense Touch Screen for Non-Conductive Stylus Detection
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Solution Overview
Problem
Current touch screen technologies, such as resistive and capacitive sensing, are limited in supporting multi-touch points and cannot effectively register inputs from non-conductive writing implements like pens and pencils, and they face challenges in large size manufacturing and resolution.
Innovation Solution
A dual-sense matrix touch screen apparatus with a capacitive sensor layer comprising X- and Y-electrode conductive layers separated by a dielectric layer with vias, allowing for both capacitance and resistance measurements to detect touch points, enabling registration of minimal pressure touches and non-conductive stylus inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitive sensing is used to achieve high resolution and multi-touch support, then measurement precision and multi-touch capability are improved, but the technology cannot detect non-conductive objects such as pens and pencils
Solution Approach 1:
The patent combines capacitive sensing and resistive sensing into a single touch screen system. The capacitive layer detects conductive objects (fingers) through capacitance changes, while the resistive layer detects non-conductive objects (pens, pencils) through resistance changes when pressed, allowing the system to handle both conductive and non-conductive writing tools with high precision
Solution Approach 2:
The dual-layer touch screen structure provides multi-functionality by enabling detection of both conductive objects (via capacitive sensing) and non-conductive objects (via resistive sensing). This universal detection capability allows the same touch screen to work with fingers, styluses, pens, and pencils without requiring separate sensing mechanisms
2Adaptability or versatility
If resistive sensing is used to support multi-touch points, then multi-touch capability is improved, but resolution is limited and large size manufacturing becomes difficult
Solution Approach 1:
The touch screen is segmented into two independent functional layers: a capacitive sensing layer for high-resolution detection and a resistive sensing layer for multi-touch support. Each layer operates independently with its own sensing mechanism, allowing the system to achieve both high resolution and multi-touch capability without compromising either function
3Area of stationary object
If large size resistive sensors are manufactured, then area coverage is improved, but manufacturing uniformity becomes extremely difficult
Solution Approach 1:
The large area touch screen is divided into two separate layers with different manufacturing requirements. The capacitive layer can be manufactured with standard precision, while the resistive layer is specifically optimized for large area uniformity. This segmentation allows each layer to be manufactured independently at optimal tolerances, making large size production feasible
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 solution achieves multi-touch capability with high resolution and supports writing/drawing inputs from non-conductive tools, enhancing usability and accuracy by fusing capacitance and resistance data for precise touch point detection.
Implementation Method 1
a capacitive sensor layer comprising an X-electrode conductive layer, a Y-electrode conductive layer, and a dielectric layer disposed between the X-electrode layer and the Y-electrode layer
Implementation Method 2
As the ITO layers of the top and bottom sheets contact, electricity is conducted at the contacted point between the two sheets
Data Source
AI summary
Various embodiments of the present disclosure provide a system, device, apparatus, and method for detecting and registering contact made with a surface, by both conductive and non-conductive implements. The present disclosure comprises a first conductive layer comprising a plurality of first conductors, a second conductive layer comprising a plurality of second conductors and a plurality of third conductors, orientated substantially coplanar to the first conductive layer; and a dielectric layer disposed between the first conductive layer and the second conductive layer, the dielectric layer comprising a plurality of vias; each of the plurality of first conductors are arranged in a first pattern, each of the plurality of second conductors are arranged in a second pattern, the second pattern correlating to the space between each of the plurality of first conductors, and each of the plurality of the third conductors are substantially shaped and orientated in the first pattern.