Rear Driving Coil for Stable Position Detection
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Solution Overview
Problem
Existing position detecting devices with electromagnetic induction-type coils face challenges in supplying sufficient electric current to position indicators, especially on large display areas, leading to unstable position detection when the indicator is not positioned at the periphery.
Innovation Solution
A position detecting device with a driving coil placed on the rear side of the display, made of low-resistance material like copper, supplies electric current to the position indicator, ensuring stable detection regardless of its location, using either alternating or simultaneous signal transmission methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent member like ITO is used as the coil for both detection and current supply, then the display surface transparency is maintained, but the resistance value becomes high and sufficient electric current cannot be supplied to the position indicator
Solution Approach 1:
The patent divides the coil system into two separate coils: a detection coil made of transparent ITO for signal detection, and a driving coil made of low-resistance copper wire for current supply. This segmentation allows each coil to be optimized for its specific function, resolving the contradiction between transparency and current supply capability
Solution Approach 2:
The patent combines the functions of detection and current supply into a unified position detecting device system, where the detection coil and driving coil work together. The detection coil maintains transparency while the driving coil ensures sufficient current supply, achieving both requirements simultaneously
2Measurement precision
If the coil is positioned on the display surface side for high detection accuracy, then detection precision is improved, but the coil resistance increases and current supply becomes insufficient, especially at the center portion of large displays
Solution Approach 1:
The patent segments the coil system into two separate coils with different positions and functions: the detection coil is positioned on the display surface side for high detection accuracy, while the driving coil is positioned on the rear surface side for efficient current supply to the entire display area including the center portion
Solution Approach 2:
The patent moves the driving coil to the rear surface side of the display, utilizing the third dimension (depth) to resolve the contradiction. This allows the detection coil to remain on the front surface for accuracy while the driving coil operates from the rear for sufficient current distribution across the entire display area
3Area of stationary object
If the position indicator is placed at the center portion of a large display, then the display area utilization is maximized, but insufficient current is supplied leading to unstable position detection
Solution Approach 1:
The patent positions the driving coil on the rear surface side of the display, utilizing the depth dimension to achieve uniform current distribution across the entire front display surface. This allows the position indicator to be placed anywhere on the large display area, including the center portion, while maintaining sufficient current supply and stable detection
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 allows for constant and stable position detection across the entire display surface, eliminating the need for users to move the position indicator to the periphery, thereby enhancing user experience and accuracy.
Implementation Method 1
The position detecting device is an electromagnetic induction-type position detecting device
Implementation Method 2
The detector is provided with electromagnetic induction-type detection coils
Data Source
AI summary
A position detecting device usable with a display having a display-surface side and a rear-surface side opposite to the front side is provided. The position detecting device includes a position indicator, a detector, and a driving coil. The detector is provided on the display-surface side of the display and is configured to detect signals transmitted from the position indicator. The driving coil is provided on the rear-surface side of the display and is configured to supply electric current to the position indicator.