Touch Panel Transparent Electrode Antenna Grounding
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Solution Overview
Problem
Existing touch panels with integrated antennas face issues such as radio wave emission malfunction during touch operations due to grounding of electrodes, increased external dimensions for antenna formation, and loss of antenna function during position detection.
Innovation Solution
A touch panel design featuring first and second transparent electrodes on opposing surfaces of two layers of film or glass, with a radio frequency circuit unit, power supply control units using inductive circuits to manage voltage and prevent attenuation of radio frequency signals, and a control unit for detecting touch positions and generating display data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the movable transparent electrode and the fixed transparent electrode are grounded via a capacitor to enable position detection, then position detection function is improved, but the antenna function is lost during touch operation
Solution Approach 1:
The patent divides the grounding function into two separate paths: one for position detection (via capacitor C1) and another for antenna operation (via inductor L1). This segmentation allows each function to operate independently without interfering with the other, resolving the contradiction between position detection and antenna functionality.
Solution Approach 2:
The patent introduces an inductor L1 as an intermediary element between the movable electrode and ground for the antenna path. The inductor acts as a mediator that blocks the grounding path during normal operation, preventing the electrode from being grounded and thus maintaining antenna function while still allowing position detection through the capacitor path.
2Volume of moving object
If the antenna is formed on a transparent conductive film within the touch panel structure, then miniaturization is achieved, but radio wave emission is attenuated during touch operations
Solution Approach 1:
The patent makes the grounding connection dynamic by using an inductor L1 that can be switched. During normal operation, the inductor prevents grounding and maintains radio wave emission. During touch operations, the grounding path can be activated through the inductor to enable position detection without permanently compromising antenna function. This dynamic control resolves the contradiction between miniaturization and radio wave emission.
3Measurement precision
If the lower surface of the upper electrode substrate and the upper surface of the lower electrode substrate are grounded for position detection, then position detection is enabled, but the antenna element loses function
Solution Approach 1:
The patent segments the grounding function by providing separate grounding paths: one through capacitor C1 for position detection and another through inductor L1 for antenna operation. This allows the antenna element to maintain its function while position detection is enabled, resolving the contradiction between these two functions.
Solution Approach 2:
The patent applies different grounding characteristics to different parts of the electrode system. The movable electrode has a capacitive grounding path for position detection while maintaining an inductive grounding path for antenna function. This local differentiation of grounding quality allows each function to operate optimally without compromising the other.
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 design enhances radio wave emission characteristics during touch operations while enabling miniaturization of the touch panel, maintaining stable antenna function and preventing radio wave attenuation.
Implementation Method 1
a power supply control unit that applies a voltage to the one transparent electrode via a first inductive circuit, guides a voltage of the other transparent electrode generated in response to the touch operation to ground via a second inductive circuit, and suppresses an attenuation of the radio frequency signal
Data Source
AI summary
A touch panel 10, which has first and second metal resistive thin films (movable transparent electrode 12 and fixed transparent electrode 13) formed respectively on opposing surfaces of two layers of film or glass (movable glass 11 and fixed glass 14) disposed opposite each other at a predetermined space, is configured such that a predetermined radio frequency signal can be inputted/outputted to/from the movable transparent electrode 12, and ground required for detecting an operation position in the touch panel 10 is connected via an inductive circuit of coils L3, L4 and the like, thereby providing a configuration in which radio waves inputted/outputted to/from the movable transparent electrodes 12 are not grounded in terms of radio frequency.