Capacitive Touch Electrode Layout With Integrated Noise Shielding
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Solution Overview
Problem
Electrostatic capacitance-type input devices are susceptible to electromagnetic wave noise penetrating from the opposite side of the input operation, leading to increased cost and thickness due to the need for additional shielding components.
Innovation Solution
The device employs a configuration with input position detecting electrodes formed by conductive films on the input operation side and a shield electrode formed by a separate conductive film on the opposite side, overlapping through an insulating film to block electromagnetic noise without adding a shielding substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a transparent substrate for electric shielding or a conductive film for electric shielding is formed on a side opposite to the input operation side, then electromagnetic wave noise shielding is improved, but the number of components is increased and thickness is increased
Solution Approach 1:
The patent merges the shielding function with the existing multilayer conductive film structure by designating one of the conductive films (the one on the side opposite to input operation) as serving both as an electrode and as an electromagnetic wave noise shield, thereby eliminating the need for separate shielding components
Solution Approach 2:
The conductive film on the side opposite to the input operation side is designed to perform multiple functions: it serves as both an electrode for capacitance detection and as an electromagnetic wave noise shield, reducing component count while maintaining shielding effectiveness
2Object-affected harmful factors
If a transparent substrate for electric shielding or a conductive film for electric shielding is formed on a side opposite to the input operation side, then electromagnetic wave noise shielding is improved, but thickness is increased
Solution Approach 1:
The shielding function is integrated into the existing multilayer conductive film structure, using the same thin conductive film layers that are already part of the device architecture, thereby providing shielding without adding significant thickness
Solution Approach 2:
The patent employs thin conductive films as the shielding mechanism, which provide effective electromagnetic wave noise shielding while maintaining a sleek, thin overall device profile without requiring thick shielding substrates
3Reliability
If the second input position detecting electrode includes a discontinued portion in an intersection portion, then the first input position detecting electrode can be electrically connected through the relay electrode, but the device complexity is increased
Solution Approach 1:
The second input position detecting electrode is intentionally segmented with a discontinued portion at the intersection, allowing the first electrode to pass through and be connected via a relay electrode, thereby enabling independent electrode pathways while maintaining electrical connectivity
Solution Approach 2:
The relay electrode acts as an intermediary element that bridges the discontinued portion of the second input position detecting electrode, providing the necessary electrical connection without requiring the electrodes to be continuous, thus enabling flexible electrode design while maintaining reliability
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 effectively shields against electromagnetic wave noise, preventing interference with input position detection while maintaining a compact design without the need for additional shielding components, thus reducing costs and thickness.
Implementation Method 1
electrostatic capacitance-type input devices monitor electrostatic capacitance that is coupled with each of a plurality of input position detecting electrodes. Thus, when a finger is in proximity to any of the plurality of input position detecting electrodes, the electrostatic capacitance of the input position detecting electrode to which the finger is in proximity increases
Implementation Method 2
an input area shield electrode that is separated from the relay electrode and overlaps with the first input position detecting electrode and the second input position detecting electrode through the interlayer insulating film in a plan view are formed by a second conductive film, which is positioned on a side opposite to the input operation side
Data Source
AI summary
An electrostatic capacitance-type input device in which input position detecting electrodes are disposed in an input area of a substrate, includes a lower layer-side conductive film, an interlayer insulating film, and an upper layer-side conductive film, which are stacked on the substrate in order from the substrate side. A first input position detecting electrode and a second input position detecting electrode that extends in a direction intersecting the first input position detecting electrode and includes a discontinued portion in an intersection portion of the first and second input position detecting electrodes are formed as the input position detecting electrodes by a first conductive film out of the lower and upper layer-side conductive films, and a relay electrode that overlaps with the first input position detecting electrode in the intersection portion so as to be electrically connected to the discontinued portion of the second input position detecting electrode and an input area shield electrode that overlaps with the first and second input position detecting electrodes are formed by a second conductive film out of the lower and upper layer-side conductive films.