Concave Display Touch Electrode Segmentation for ESD Protection
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Solution Overview
Problem
Display devices are prone to defects due to electrostatic discharge, particularly in areas with concave portions where continuous electrode connections are obstructed, leading to potential electrical disconnections and reduced sensitivity in touch input detection.
Innovation Solution
The display device incorporates an input detection unit with a connection wire that bypasses the concave portion, comprising separate segments and conjunction portions to maintain electrical connectivity, along with a bridge electrode and insulating layers to manage parasitic capacitance and enhance sensing sensitivity, while a dummy line in a floating state reduces visibility and prevents short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous connection wire is used across the concave portion, then electrical connectivity is maintained, but electrostatic discharge causes defects and damage
Solution Approach 1:
The connection wire is divided into multiple separate segments rather than forming a continuous conductive path. These segments are spaced apart and do not directly contact each other, which prevents electrostatic discharge from causing defects while still maintaining electrical connectivity through the segmented structure. Each segment connects to detection electrodes without creating a continuous vulnerable path across the concave portion.
2Object-affected harmful factors
If the connection wire bypasses the concave portion with segments, then electrostatic discharge damage is prevented, but electrical connectivity and sensing sensitivity may be reduced
Solution Approach 1:
Detection electrodes serve as intermediaries between the segmented connection wire segments. The first detection electrodes connect to one set of wire segments, and the second detection electrodes connect to another set, mediating the electrical connection across the concave portion. This intermediary structure maintains sensing capability while preventing direct electrostatic discharge damage through the segmented wire configuration.
3Measurement precision
If detection electrodes are densely arranged for high sensitivity, then touch input detection sensitivity is improved, but parasitic capacitance increases and causes interference
Solution Approach 1:
The patent utilizes a multi-layer structure where detection electrodes are arranged in different vertical layers. First detection electrodes and second detection electrodes are positioned at different heights, creating a three-dimensional electrode arrangement. This spatial separation in the vertical dimension reduces parasitic capacitance between adjacent electrodes while maintaining high detection sensitivity through the multi-layer configuration.
Solution Approach 2:
Insulating layers serve as intermediaries between detection electrodes in different layers. These insulating layers are positioned between the first and second detection electrodes, reducing direct electromagnetic interference and parasitic capacitance while allowing the electrodes to maintain their sensing functions. The insulating layers mediate the electrical fields between layers.
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 prevents defects from electrostatic discharge, maintains electrical connectivity across concave portions, and enhances touch input detection sensitivity by managing electrical charges and reducing the risk of damage from accumulated electric charges.
Implementation Method 1
a first insulating layer between the bridge electrode and the second detection electrodes and between the segments and the conjunction portion
Implementation Method 2
a connection wire that electrically connects a pair of the first detection electrodes disposed at both sides of the concave portion, and the connection wire includes a plurality of segments separate from each other and conjunction portions that electrically connect two adjacent segments to each other
Implementation Method 3
the input detection unit includes a plurality of first detection electrodes electrically connected to each other in a first direction, a plurality of second detection electrodes electrically connected to each other in a second direction perpendicular to the first direction
Data Source
AI summary
A display device includes a display panel that includes a concave portion at a side of the display panel; and an input detection unit disposed over the display panel. The input detection unit includes a plurality of first detection electrodes electrically connected to each other in a first direction, a plurality of second detection electrodes electrically connected to each other in a second direction perpendicular to the first direction, and a connection wire that electrically connect a pair of the first detection electrodes of the plurality of first detection electrodes disposed at both sides of the concave portion, and the connection wire includes a plurality of segments separate from each other and conjunction portions that electrically connect two adjacent segments to each other.