EMR Pen Sensor Layout for Gate-Line Noise Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Noise originating from gate lines of the display device reduces the accuracy of location detection of an electromagnetic induction pen in electronic apparatuses with overlapping EMR sensors, necessitating a solution to improve detection accuracy.
Innovation Solution
A location detection device and electronic apparatus that utilizes a sensor controller to detect the location of an electromagnetic induction pen by combining alternating currents from loop coils located at opposite ends of the panel surface, canceling noise from gate lines using low-pass filters and an adder to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an EMR sensor is arranged to overlap with a display device, then the sensor can be integrated into the electronic apparatus structure, but noise from gate lines of the display device contaminates the alternating current output from loop coils located near either end of the panel surface
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the noise from gate lines as a reference signal. The sensor controller reads alternating current outputs from loop coils at opposite ends of the panel surface, where the noise from gate lines is present in both readings. By subtracting the noise component from one reading using the other reading as reference, the patent converts the harmful noise into a useful reference for noise cancellation, thereby improving location detection accuracy.
2Area of stationary object
If loop coils are arranged near either end of the panel surface, then the sensor can cover the entire detection area, but noise from gate lines significantly contaminates the alternating current output
Solution Approach 1:
The patent introduces an intermediary approach by using loop coils at opposite ends of the panel surface as reference sensors. These reference loop coils, which are subjected to the same gate line noise as the measurement loop coils, serve as intermediaries to capture the noise characteristic. The sensor controller then uses these reference readings to subtract the noise component from the measurement readings, effectively isolating the harmful noise factor while maintaining full detection area coverage.
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
The proposed solution effectively reduces noise interference from gate lines, improving the accuracy of location detection and data reception from electromagnetic induction pens in electronic apparatuses with overlapping EMR sensors.
Implementation Method 1
Some electronic apparatuses that support pen input, such as smartphones and tablet terminals, are configured to detect the location of an electromagnetic induction pen by using an electro-magnetic resonance (EMR) method, which is a type of electromagnetic induction method.
Implementation Method 2
detect the location of an electromagnetic induction pen by using an electro-magnetic resonance (EMR) method
Data Source
AI summary
A location detection device according to the present disclosure includes an electro-magnetic resonance (EMR) sensor arranged to overlap with a display device, and a sensor controller connected to the EMR sensor. The EMR sensor includes a plurality of loop coils arranged side by side in a first direction of a panel surface. The sensor controller, in operation, detects a location of an electromagnetic induction pen, based on an alternating current generated by using both of a first alternating current output from a first loop coil located proximate one end of the plurality of loop coils in the first direction, and a second alternating current output from a second loop coil located on an opposite side of a center of the panel surface in the first direction from the first loop coil. The accuracy of location detection for an electromagnetic induction pen, performed by using the EMR sensor improved.