Touch Sensor Antenna Insulation for Signal Noise Reduction
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Solution Overview
Problem
The integration of antennas with touch sensors in display regions leads to signal interference, causing noise and degrading the performance of both systems, especially in compact devices like cell phones where space is limited.
Innovation Solution
An antenna-equipped touch sensor design where the antenna unit is formed on the sensing electrode unit while being insulated from it, featuring a signal radiation pattern and transmission line, with the antenna unit located in a defined region by the unit electrode pattern, and using a mesh or thin-film structure with conductive oxide, and insulating units to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an antenna is mounted in the display region where the touch sensor is installed, then the space for installing the antenna is maximized and the screen region is maximized, but noise is caused by interference between the touch sensor signal and the antenna transmission/reception signal
Solution Approach 1:
An insulating layer is introduced as an intermediary between the antenna and the touch sensor electrodes. This insulating layer acts as a mediator that electrically isolates the two components, preventing signal interference and noise while allowing both the antenna and touch sensor to function in the same display region.
Solution Approach 2:
The display region is segmented into functionally isolated zones by using the insulating layer to divide the space between the antenna and touch sensor electrodes. This segmentation allows each component to operate independently without electromagnetic interference, enabling both full-screen display and antenna integration.
2Reliability
If an antenna is provided separately from the image display apparatus or touch sensor, then signal interference is avoided, but the complexity of the internal structure increases and manufacturing cost increases and thickness increases
Solution Approach 1:
The antenna and touch sensor are merged into a single integrated structure where the antenna is formed on the same substrate as the touch sensor electrodes. The insulating layer enables this merging by providing electrical isolation, allowing both components to coexist in the same device without requiring separate assemblies, thereby reducing structural complexity and manufacturing cost.
Solution Approach 2:
The insulating layer serves multiple functions simultaneously: it acts as an electrical insulator to prevent signal interference, provides mechanical support for the antenna structure, and enables the integration of both antenna and touch sensor functions within a single device layer, reducing the overall device complexity.
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 effectively minimizes noise interference between touch sensor and antenna signals, enhancing the performance of both systems even when the antenna is mounted in the display region, as demonstrated by experimental data showing reduced delta mutual-capacitance ratios.
Implementation Method 1
the antenna unit includes a signal radiation pattern unit and a signal transmission line unit
Implementation Method 2
the antenna unit is formed on the sensing electrode unit included in the touch sensor unit while being insulated from the sensing electrode unit
Data Source
AI summary
The present invention relates to a touch sensor having an antenna. The touch sensor comprises: a touch sensor part including a sensing electrode part; and an antenna part formed on the touch sensor part. The antenna part is formed in a state of being insulated from the sensing electrode part on the sensing electrode part composing the touch sensor part. According to the present invention, even when mounting the antenna on a display region in which a touch sensor is installed, noise due to interference between a touch sensor signal and an antenna transmission/reception signal can be minimized.