Pen Detection Unit Integrating Loop Antenna for Wireless Charging
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Solution Overview
Problem
The thickness and manufacturing cost of display devices are increased due to the presence of separate antennae for wireless charging, NFC, and MST modules, which are not efficiently integrated with pen detection systems.
Innovation Solution
A pen detection unit with a pen detection panel featuring a spiral-shaped loop antenna and transistors, connected to a pen driving circuit that can operate in two modes: detecting pen position and transferring signals to an external electromagnetic induction device, thereby integrating pen detection with wireless charging and NFC functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate antennae are provided for wireless charging, NFC, and MST modules, then the display device can perform multiple electromagnetic functions, but the thickness and manufacturing cost of the display device are increased
Solution Approach 1:
The patent makes the loop antenna in the pen detection unit serve multiple functions: it acts as both the pen detection antenna and the antenna for wireless charging, NFC, and MST modules. The pen driving circuit is configured to operate in different modes (pen detection mode and electromagnetic induction mode) to enable the same hardware to perform different functions, thereby eliminating the need for separate dedicated antennae and reducing device thickness.
Solution Approach 2:
The patent merges the pen detection function with wireless charging, NFC, and MST functions by integrating their antenna requirements into a single loop antenna structure. The pen detection panel and electromagnetic induction modules share the same antenna resource, combining multiple functions into one unified system that reduces overall device complexity and thickness.
2Adaptability or versatility
If separate antennae are provided for wireless charging, NFC, and MST modules, then the display device can perform multiple electromagnetic functions, but the manufacturing cost of the display device is increased
Solution Approach 1:
The loop antenna in the pen detection unit is designed to serve multiple purposes: pen detection, wireless charging, NFC, and MST functions. By making this single antenna structure universal, the patent eliminates the need to manufacture and assemble multiple separate antenna components, thereby reducing manufacturing complexity and cost while maintaining full electromagnetic functionality.
Solution Approach 2:
The patent combines the antenna structures for different electromagnetic functions into a single integrated loop antenna system. This merging approach reduces the number of separate components that need to be sourced, manufactured, and assembled, leading to lower manufacturing costs and simplified production processes.
3Length of stationary object
If the loop antenna is used for both pen detection and electromagnetic induction, then the device thickness and cost are reduced, but the antenna must switch between different operational modes
Solution Approach 1:
The patent implements dynamic mode switching in the pen driving circuit, allowing the loop antenna to transition between pen detection mode and electromagnetic induction mode based on operational requirements. The circuit can dynamically adjust its configuration and connection states to accommodate different functional modes, enabling a single antenna structure to adapt to multiple uses without physical reconfiguration.
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 integration reduces the thickness and manufacturing cost of display devices by utilizing the pen detection unit's loop antenna as an antenna for various modules, such as wireless charging and NFC, while maintaining effective pen detection capabilities.
Implementation Method 1
a pen driving circuit configured to detect a position of a pen, based on a sensing signal received through the first loop antenna in a first mode
Implementation Method 2
transfer the sensing signal to an external electromagnetic induction device in a second mode different from the first mode
Implementation Method 3
The pen may include a resonant circuit configured with at least one capacitor and at least one inductor
Data Source
AI summary
A pen detection unit and a display device including a pen detection panel. The pen detection panel includes a plurality of sensor parts, and each of the sensor parts includes a first loop antenna and at least one transistor connected to the first loop antenna. A pen driving circuit detects a position of a pen, based on a sensing signal received through the first loop antenna in a first mode, and transfers the sensing signal to an external electromagnetic induction device in a second mode different from the first mode.