Loop Coil Position Detection Minimizing Moiré Interference
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Solution Overview
Problem
Conventional position detecting apparatuses, when integrated with display devices, face design restrictions and produce moiré patterns due to the placement of detecting conductors, leading to interference and viewing issues on the display.
Innovation Solution
A position detecting apparatus with loop coils disposed on the display side, where the long sides of the loop coils cross the direction of display elements, minimizing interference and allowing for the detection of indicated positions without compromising image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the position detecting apparatus is provided at the back side of the display apparatus, then the design flexibility of the display apparatus is improved, but the detection accuracy and reliability deteriorate
Solution Approach 1:
The patent inverts the conventional arrangement by placing the position detecting apparatus on the display side rather than the back side. This allows the detecting portion to be formed on a transparent substrate that can be integrated with the display structure, achieving both design flexibility and detection accuracy through the inversion of the traditional configuration
2Adaptability or versatility
If the position detecting apparatus is provided at the display side of the display apparatus, then the design flexibility of the display apparatus is improved, but moiré patterns occur between display elements and detecting conductors
Solution Approach 1:
The patent applies asymmetry by configuring the detecting conductors in a non-uniform, irregular pattern rather than a regular grid. This asymmetric arrangement disrupts the periodic interference that causes moiré patterns, allowing the position detecting apparatus to be placed on the display side without producing harmful interference patterns
Solution Approach 2:
The patent changes the spatial parameters of the detecting conductors by varying their positions, orientations, and densities across different regions. This parameter variation prevents the formation of regular interference patterns while maintaining effective position detection capability
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
Enables the combination of display and position detecting apparatuses without producing moiré patterns, allowing for flexible design and operation without restricting the display device's design or location of driving circuits.
Implementation Method 1
The present invention relates to a position detecting apparatus, a position inputting apparatus, and a computer capable of preventing problems associated with interference patterns from being produced on a display even when a display apparatus and the position detecting apparatus are combined
Data Source
AI summary
A position detecting apparatus includes a display apparatus having a screen for displaying images by changing states of a plurality of display elements arrayed in the screen along a predetermined direction which is parallel to a side boundary of the screen, and at least one detecting conductor disposed on the display apparatus to detect a position indicated on the display apparatus. The at least one detecting conductor is a loop coil having short sides and long sides, the long sides of the loop coil being arranged so as to cross the predetermined direction of the display elements.