Electromagnetic Induction Panel with Segmented Coils
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Solution Overview
Problem
Electromagnetic induction devices, such as digitizers and wireless charging systems, face issues with 'shade areas' where the magnetic field is concentrated, leading to recognition failures of external components like pens or devices, due to the inherent characteristics of the coils used, which result in incomplete coverage and inefficient power transfer.
Innovation Solution
The implementation of an electromagnetic induction panel with a substrate divided into regions, featuring first, second, and third induction coils wound in specific directions, allowing for the generation of sub-magnetic fields that penetrate all areas, eliminating shade regions and enabling comprehensive magnetic field coverage by connecting the first and third coils electrically and controlling current flow based on component position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single coil is used to generate magnetic field, then the device structure is simple, but the magnetic field coverage is incomplete with shade areas appearing at coil edges
Solution Approach 1:
The patent divides the single coil structure into multiple separate coils (first coil, second coil, third coil, and fourth coil) arranged in different regions. Each coil generates magnetic field in its respective region, collectively achieving complete coverage without shade areas. The first and third coils are wound in first winding direction while second and fourth coils are wound in second winding direction opposite to the first, creating complementary magnetic field distributions.
Solution Approach 2:
Different coils are positioned in different regions (first region, second region, third region, fourth region) with specific winding directions tailored to each location. This local optimization ensures that each region receives adequate magnetic field strength, eliminating the uniform shade area problem that occurs with a single coil design.
2Reliability
If multiple coils are used to eliminate shade areas, then the magnetic field coverage is complete, but the device complexity increases
Solution Approach 1:
The patent segments the coil system into four distinct coils distributed across four regions, with each coil responsible for generating magnetic field in its specific region. This segmentation ensures that the electronic pen can be reliably detected anywhere on the tablet surface without falling into shade areas, thereby improving recognition reliability while maintaining manageable structural complexity through systematic arrangement.
3Area of stationary object
If current is provided to all coils simultaneously, then the magnetic field coverage is maximized, but the power consumption increases
Solution Approach 1:
The patent implements dynamic current control where the controller selectively provides current to different coils based on the detected position of the electronic pen. When the pen is in the first region, current is provided to the first coil; when in the second region, current is provided to the second coil, and so on. This dynamic adjustment maintains complete magnetic field coverage capability while significantly reducing power consumption by activating only the necessary coil at any given time.
Solution Approach 2:
The system uses feedback from position detection to control current distribution. The controller detects the position of the electronic pen and uses this information to determine which coil should be activated, creating a closed-loop control system that optimizes power consumption while maintaining reliable detection 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
This configuration ensures complete magnetic field coverage without shade areas, enhancing the recognition of external components and reducing power consumption by dynamically adjusting current distribution based on component position, thereby improving device functionality and efficiency.
Implementation Method 1
An electromagnetic induction technique generates a magnetic field by providing a current to a first coil and generates an induced electromotive force (or, an induction electromagnetic power, an induced current) at a second coil in association with the magnetic field.
Data Source
AI summary
An electromagnetic induction panel includes a substrate including a first region, a second region, and a third region, a first induction coil arranged along an edge of the first region of the substrate and wound in a first winding direction, a second induction coil arranged along an edge of the second region and wound in a second winding direction opposite to the first winding direction, the second region surrounding the first region, and a third induction coil arranged along an edge of the third region and wound in the second winding direction, the third region surrounding the second region.