Shared Electrode Array for Touch and Stylus Data Sensing
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Solution Overview
Problem
Existing combination touch sensor-digitizer devices face challenges due to high cost, complexity, and space requirements, limiting their applicability and integration with specialized displays.
Innovation Solution
A combination touch and transducer input system that uses a transducer, such as a stylus, and an array of electrodes to simultaneously or alternately operate in touch and transducer sensing modes, enabling position detection of both fingers and styluses through capacitance and electric field sensing, with digital data transmission using frequency-shift keying techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If combination touch sensor-digitizer is implemented, then position detection accuracy and resolution are improved, but device complexity and cost increase
Solution Approach 1:
The patent combines touch sensor and digitizer functions into a single integrated system that uses one array of electrodes to perform both capacitive touch sensing and transducer position detection. The controller alternates between touch mode and transducer mode, eliminating the need for separate sensor arrays and reducing overall system complexity while maintaining high position detection accuracy for both input methods.
Solution Approach 2:
The array of electrodes serves multiple functions: it detects capacitive touches from fingers, detects electromagnetic signals from transducers, and enables bidirectional digital data transmission. This multi-functional design allows a single component to replace what would traditionally require separate specialized components, reducing device complexity while preserving measurement precision.
2Measurement precision
If combination touch sensor-digitizer is implemented, then position detection accuracy and resolution are improved, but manufacturing cost increases
Solution Approach 1:
By merging touch sensor and digitizer capabilities into a single electrode array, the patent reduces the total component count and simplifies the manufacturing process. Instead of producing and integrating separate touch sensor and digitizer assemblies, manufacturers can produce a single integrated sensing layer, significantly reducing manufacturing costs while maintaining high position detection accuracy.
Solution Approach 2:
The universal electrode array that performs multiple sensing functions eliminates the need for specialized components for each input method. This consolidation reduces bill of materials costs, simplifies assembly processes, and enables standard manufacturing techniques to be used for a multi-functional device, thereby reducing overall manufacturing cost while preserving measurement precision.
3Measurement precision
If combination touch sensor-digitizer is implemented, then position detection accuracy and resolution are improved, but three-dimensional space requirements increase
Solution Approach 1:
The patent merges touch sensor and digitizer functionality into a single planar electrode array structure that operates in the same physical space. By alternating between touch mode and transducer mode, the system achieves high position detection accuracy for both input methods without requiring additional three-dimensional space, as both functions share the same sensing layer.
4Adaptability or versatility
If combination touch sensor-digitizer is implemented, then versatility is improved, but device complexity increases
Solution Approach 1:
The electrode array is designed to universally detect both capacitive touches and electromagnetic signals from transducers, enabling the device to support multiple input methods (finger touch and stylus input) with a single sensing system. The controller intelligently switches between touch mode and transducer mode, providing versatile input capabilities while managing system complexity through unified architecture rather than multiple separate systems.
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
Facilitates user input with both fingers and styluses, enhancing accuracy and resolution while reducing complexity and space requirements, and allowing bi-directional digital data transmission.
Implementation Method 1
the transducer and each of the array of electrodes are capacitively coupled, the controller determines the position of the transducer by measuring a charge induced at each of the array of electrodes
Implementation Method 2
the transducer is configured to generate an electric field
Implementation Method 3
the controller determines the position(s) of one or more proximate objects (e.g., fingers) by capacitively sensing the object(s) with the array of electrodes
Implementation Method 4
The transducer is further configured to send digital data to the sensor. For example, the transducer may include electronic circuitry (e.g., a microcontroller unit (MCU) or microprocessor) configured to encode digital data in the electric field for transmission to the array of electrodes
Data Source
AI summary
A combination touch and transducer input system is provided, which facilitates user input into an electronic system with a finger and/or a transducer (e.g., a stylus). The system includes a transducer configured to generate an electric field, and a sensor including an array of electrodes and a controller. The transducer is configured to transmit digital data, such as pen pressure data and switch status data, to the sensor. For example, the transducer comprises electronic circuitry configured to encode the digital data in a signal for transmission to the sensor. The sensor controller is configured to operate both in a touch sensing mode and in a transducer sensing mode. During the touch sensing mode, the controller determines a position of a proximate object (e.g., a finger) by capacitively sensing the object with the array of electrodes. During the transducer sensing mode, the controller determines a position of the transducer based on a signal received by the array of electrodes from the transducer, and also receives and decodes the digital data encoded in the received signal. Digital data can be encoded in a signal using any suitable digital modulation techniques, such as a Frequency-Shift Keying (FSK) technique.