Capacitive Data Reading Device for Passive Touch Panels
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Solution Overview
Problem
Current data transmission methods for capacitive touch panels lack efficient short-distance data transmission and reception capabilities, especially for devices without active power sources like smart cards and credit cards.
Innovation Solution
A data reading and transmission device utilizing capacitance coupling, with electrodes forming coupling capacitances and a control circuit that varies voltage differences to detect charge changes, enabling data transmission and reception without the need for active power sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If capacitance coupling is used for data transmission, then devices without active power sources can communicate, but transmission efficiency and speed are limited
Solution Approach 1:
The patent applies periodic action by using alternating voltage signals applied to electrodes to periodically charge and discharge coupling capacitors. This periodic charging/discharging creates detectable current pulses that encode data, enabling faster transmission than continuous static capacitance measurement while maintaining compatibility with passive devices.
Solution Approach 2:
The patent changes the voltage parameter dynamically by applying varying voltages to different electrodes in a controlled sequence. This voltage variation causes corresponding changes in charge and current flow through the coupling capacitors, enabling higher-speed data transmission through multiple detectable states rather than single static measurements.
2Adaptability or versatility
If multiple electrodes are used for capacitance coupling, then data transmission capability is enabled, but device complexity increases
Solution Approach 1:
The patent segments the electrode system into multiple independently controllable electrodes, each capable of being applied with different voltages. This segmentation allows complex data transmission protocols to be implemented through simple voltage switching on individual electrodes, managing complexity through modular control rather than requiring complex integrated structures.
Solution Approach 2:
The patent makes the electrode system universal by designing electrodes that can serve multiple functions: data transmission, power transfer, and signaling. The same electrode infrastructure supports various communication protocols and can interface with different types of passive devices, reducing overall system complexity through multi-functionality rather than requiring separate dedicated components.
3Measurement precision
If voltage difference varies with time to detect charge changes, then data reading accuracy is improved, but energy consumption increases
Solution Approach 1:
The patent uses periodic voltage application in controlled cycles, allowing the system to accumulate charge information over multiple periods rather than requiring continuously high voltage. This periodic operation maintains detection accuracy through repeated measurements while reducing peak power consumption compared to continuous voltage variation.
Solution Approach 2:
The patent maintains continuous useful action by keeping electrodes at defined voltage states rather than constantly switching between them. The control circuit maintains stable voltage conditions during data transmission phases, reducing unnecessary energy consumption from frequent voltage transitions while preserving charge detection accuracy through continuous monitoring.
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
Enables efficient short-distance data transmission and reception in capacitive touch panels and other devices, including those without active power sources, by effectively detecting charge changes through capacitance coupling.
Implementation Method 1
a first electrode, forming a first coupling capacitance with the data transmission device; a second electrode, forming a second coupling capacitance with the data transmission device
Data Source
AI summary
A data reading device that transmits power to a data transmission device and reads data transmitted from the data transmission device is provided. The data reading device includes: a first electrode, forming a first coupling capacitance with the data transmission device; a second electrode, forming a second coupling capacitance with the data transmission device; a control circuit, coupled to the first electrode and the second electrode, configured to provide the first electrode with a first reference voltage and the second electrode with a second reference voltage to cause a voltage difference between the first electrode and the second electrode to vary with time, and to detect charge changes of the first coupling capacitance and the second capacitor; and a determination unit, coupled to the control circuit, configured to determine the data according to the charge changes.