Capacitive Touch Sensor Delta Configuration for Noise Reduction
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Solution Overview
Problem
Capacitive touch screen panels face challenges in detecting multiple touches due to noise interference from common electrodes in display devices like LCDs, leading to increased manufacturing costs and complexity, and difficulty in implementing multi-touch and gesture recognition.
Innovation Solution
A touch detection sensor structure with a delta configuration, where sensors in each column or row are mismatched by a predetermined offset, allowing for improved separation of touch signals and reduced noise sensitivity, enabling more accurate multi-touch detection without the need for additional shielding layers or air gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transparent conductive layers with metal electrodes are used for capacitive touch detection, then transmissivity is improved and multi-touch capability is enabled, but noise interference from common electrodes increases and detection precision deteriorates
Solution Approach 1:
The sensor array is divided into multiple rows and columns, with each row or column forming an independent detection channel. This segmentation allows the system to process touch signals from different spatial locations separately, reducing noise interference through spatial diversity while maintaining high transmissivity of the transparent conductive layers.
Solution Approach 2:
The patent transitions from detecting only the magnitude of micro current to detecting both the magnitude and phase of touch signals. By introducing phase information as an additional dimension, the system can distinguish touch signals from noise more effectively, improving detection precision without compromising transmissivity.
2Ease of operation
If current sensors are used to detect micro current magnitude, then touch detection is enabled, but manufacturing cost increases and multi-touch capability is limited
Solution Approach 1:
The touch detection structure is designed to serve multiple functions: it can detect single-touch, multi-touch, and gesture inputs using the same sensor array and signal processing methodology. The phase-based detection approach works universally across different touch scenarios, eliminating the need for different detection apparatuses for different touch types.
Solution Approach 2:
The patent replaces complex current magnitude detection mechanisms with a simpler phase-based detection system. By using phase information instead of relying solely on current magnitude, the system achieves multi-touch capability with simpler detection apparatus, reducing manufacturing cost while maintaining ease of operation.
3Adaptability or versatility
If linear sensors are used for capacitive touch detection, then multi-touch capability is improved, but noise from common electrodes increases and detection resolution deteriorates
Solution Approach 1:
The system uses phase information as feedback to distinguish touch signals from noise. By analyzing the phase relationship between transmitted and received signals, the system can identify genuine touch events versus noise interference, maintaining high detection resolution even with multiple touches detected simultaneously.
Solution Approach 2:
The patent changes the detection parameter from current magnitude to phase. This parameter change allows the system to maintain high detection resolution while achieving multi-touch capability, as phase information provides additional discrimination power to separate multiple touch events from noise in the signal.
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 configuration enhances the detection resolution of touch coordinates, reduces the number of sensors required, and minimizes manufacturing costs by eliminating the need for additional shielding layers, while maintaining effective noise rejection and multi-touch capability.
Implementation Method 1
a plurality of touch detection sensors generating a touch capacitance by an approach of a conductor
Data Source
AI summary
The present invention proposes to solve the problems of the existing capacitive type touch screen panel as described above and an object of the present invention is to differently dispose positions of sensors 10 configuring a touch screen panel in each column or each row, that is, differently disposing touch detection sensors in each column or each row of the touch panel to extract optimal conditions of a separation, thereby more reducing the number of touch sensors 10 compared to a stripe structure which has to reduce a length of a basic sensor to satisfy the same separation conditions.