Touch Panel Shielding via Integrated Conductive Layer Merging
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Solution Overview
Problem
Portable electronic devices with electrostatic capacitance type touch panels experience erroneous coordinate signals when gripped strongly, as the shield grounds move independently, disrupting the electric field lines between transmission and reception electrodes.
Innovation Solution
The device incorporates conductive members along the sides and bottom of the display unit, which are accommodated in a concave part, ensuring that the touch panel and conductive members move together, maintaining the relative positional relation and preventing erroneous coordinate signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If shield grounds are provided separately from the touch panel, then shielding effect is improved, but relative positional relation is disrupted causing erroneous coordinate signals
Solution Approach 1:
The patent combines the shield ground and touch panel into a single integrated structure. The conductive shield layers are formed simultaneously with the touch panel electrodes on the same substrate, ensuring they move together as one unit. This eliminates the relative positional displacement that occurs when shield grounds are provided separately, while maintaining the shielding effect against external electromagnetic interference.
Solution Approach 2:
The patent implements a multi-layered structure where conductive shield layers are nested within the touch panel assembly. The shield layers are positioned between the touch panel and external environment, creating a nested configuration that provides shielding while maintaining fixed relative positions. This nested structure ensures that the shield and touch panel elements move together without relative displacement.
2Object-affected harmful factors
If shield grounds are fixed independently, then shielding performance is enhanced, but movement synchronization with touch panel is lost
Solution Approach 1:
The shield ground and touch panel are merged into a single integrated assembly that moves together. The conductive shield layers are formed on the same substrate as the touch panel electrodes, creating a unified structure where both components maintain their relative positional relations during device movement or gripping operations.
3Stability of the object's composition
If conductive members are added around display unit, then positional stability is improved, but device complexity increases
Solution Approach 1:
The patent merges the conductive shield layers with the touch panel structure, forming them simultaneously on the same substrate. This integration approach provides the necessary positional stability and shielding functionality without adding separate, independent components, thereby avoiding significant increases in device complexity.
Solution Approach 2:
The conductive layers serve multiple functions: they act as both the touch panel electrodes for detecting user input and as shield grounds for blocking external electromagnetic interference. This multi-functionality reduces the need for additional separate components, maintaining device simplicity while achieving both touch sensitivity and shielding performance.
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 that the touch panel functions correctly even when the device is gripped, as the electric field lines remain unchanged, preventing erroneous signals and maintaining the performance of the touch panel.
Implementation Method 1
a touch panel disposed so as to be stacked on the display unit and capable of detecting at least a distance to an indicator using an electric field
Implementation Method 2
maintaining the relative positional relation and preventing erroneous coordinate signals
Data Source
AI summary
A portable electronic apparatus includes a housing having a first face and first and second side faces, the first and second side faces rising from the first face, and at least a concave portion is configured by the first side face, the first face and the second side face; a display, at least a part of the display being accommodated in the concave portion; a touch panel that is positioned on the display and is capable of detecting at least a distance to an indicator; first and second sheet metal members respectively disposed on the first and second side faces, at least a part of the first and second sheet metal members facing a side face of the display; a third sheet metal member disposed on the first face; and a cover glass that covers at least the display, the first sheet metal member, and the second sheet metal member.