Position Detector with Non-Metallic Auxiliary Member
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Solution Overview
Problem
Existing position detectors with metal bezels interfere with the magnetic field signals used for position detection, leading to inaccurate detection at the edges of the display area due to signal blocking and coverage issues with loop coils.
Innovation Solution
A position detector configuration using a thin display device and a position detecting sensor with a metal upper holding member and a non-metallic auxiliary member to fix the display component, ensuring the loop coils outside the effective display area are not obstructed, allowing for accurate signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal upper holding member is used to clamp the display device and position detecting sensor, then the structural strength and stability are improved, but the metal material interferes with the magnetic field signals used for position detection
Solution Approach 1:
The holding member is divided into two distinct parts: an upper holding member made of metal material for structural support, and a lower holding member made of non-metal material for signal compatibility. This segmentation allows each part to fulfill its specific function without interference.
Solution Approach 2:
Different materials are used in different locations of the holding member structure. The upper part uses metal for strength where signal interference is less critical, while the lower part uses non-metal material where magnetic field transmission is essential for position detection.
2Device complexity
If the frame part of the upper holding member covers the loop coils outside the effective display area, then the assembly is simplified, but the position detection accuracy at the edges deteriorates
Solution Approach 1:
The lower holding member is designed with a specific configuration where its frame part does not cover the loop coils in the non-effective display area. This local design consideration ensures that the magnetic field signals can be properly transmitted and received at the edges of the display area.
Solution Approach 2:
The non-metallic lower holding member acts as an intermediary structure that supports the position detecting sensor while allowing magnetic field transmission. Its specific design creates a pathway for magnetic field signals to reach the loop coils without obstruction.
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 reliable detection of positions indicated by an electronic pen at the edges of the display area by preventing signal obstruction and ensuring proper loop coil functionality, enhancing the accuracy and reliability of position detection.
Implementation Method 1
a position detecting sensor that is configured by arranging a plurality of loop coils in each of a first direction (X-axis direction) and a second direction (Y-axis direction) that intersect each other and detects an indicated position on a display screen
Implementation Method 2
indication input is carried out by using an electronic pen of the electromagnetic induction system. The position detecting sensor of the electromagnetic induction system is a sensor in which plural loop coils are disposed
Data Source
AI summary
A position detector as one electronic part is configured by clamping and holding a stacking body obtained by stacking a display comprising a resin frame and an LCD part and a position detecting sensor by a back bezel and a front bezel. By using an auxiliary member, an upper surface frame part of the front bezel is kept from covering a part, in a loop coil, that is disposed outside an effective display area and relates to detection of an indicated position at an end part of the effective display area.