Sensor Device With Shared Pad Row For Antenna And Touch Sensing
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Solution Overview
Problem
The integration of antennas and touch sensors in image display devices leads to signal interference and requires separate circuit connections for power supply, resulting in inefficiencies and increased complexity.
Innovation Solution
A sensor device is designed with touch sensing electrodes, antenna units, and shared pads that form a single pad row, allowing for independent operation of touch sensing and antenna power supply through a single circuit board, thereby reducing interference and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If antenna structure is disposed together with touch sensor, then space efficiency is improved, but signal interference occurs between antenna and touch sensing electrode
Solution Approach 1:
A ground electrode is introduced as an intermediary element between the antenna and touch sensing electrode. The ground electrode acts as a shield to block electromagnetic interference from the antenna while allowing the touch sensing function to operate independently. This mediator structure prevents direct interference between the two functional elements while maintaining their close proximity for space efficiency.
Solution Approach 2:
The electrode structure is segmented into distinct functional zones: antenna electrode, ground electrode, and touch sensing electrode. By dividing the electrode system into separate segments with specific functions, the patent enables independent operation of each component while maintaining physical proximity, thus resolving the interference issue without sacrificing space efficiency.
2Object-affected harmful factors
If separate circuit connection structures are used for antenna and touch sensor, then signal interference is reduced, but device complexity increases
Solution Approach 1:
The patent merges the antenna connection structure and touch sensor connection structure into a single integrated circuit board. Both the antenna electrode and touch sensing electrode are connected to the same circuit board through separately defined pad regions, eliminating the need for multiple separate circuit boards while maintaining signal integrity through proper grounding and routing.
Solution Approach 2:
The circuit board is designed with multi-functionality to serve both antenna connection and touch sensor connection purposes. By creating a universal connection structure that accommodates both functions, the patent reduces overall device complexity while maintaining the electrical separation needed to prevent signal interference.
3Device complexity
If antenna and touch sensor share the same circuit board, then device complexity is reduced, but signal interference may occur
Solution Approach 1:
The circuit board is designed with local quality variations through distinct pad region definitions. Different areas of the circuit board have specialized characteristics: antenna pads for RF connection, touch sensor pads for capacitive sensing, and ground pads for shielding. This localized optimization allows both functions to coexist on the same board without interference.
Solution Approach 2:
Ground pads and ground electrodes serve as intermediaries between the antenna and touch sensor circuits on the shared circuit board. These ground elements provide electromagnetic shielding and reference potential, enabling safe coexistence of both functional circuits on the same substrate while preventing signal coupling.
Data Source
AI summary
A sensor device includes touch sensing electrodes, traces extending from the touch sensing electrodes, touch sensor pads connected to the traces, an antenna unit disposed adjacent to the touch sensing electrodes and including a radiator, a transmission line connected to the radiator, and ground lines extending around the transmission line, and antenna pads forming a pad row together with the touch sensor pads, and including a signal pad connected to the transmission line and ground pads connected to the ground lines.