Touch Sensor Electrode Structure With Contact Holes for Low RC Delay
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Solution Overview
Problem
Existing touch panels in display devices face challenges with increased RC delay due to parasitic capacitance and high resistance, leading to low response speed and potential defect issues from thick touch insulating layers.
Innovation Solution
A display device design with a touch sensor that includes contact holes in the touch insulating layer, allowing conductive films to connect conductive patterns directly, and a thin film encapsulation layer for improved sensing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a thick touch insulating layer is formed to reduce RC delay, then response speed is improved, but defect problems occur due to non-contact phenomenon of the conductive layer
Solution Approach 1:
The touch insulating layer is segmented by forming contact holes that penetrate through it, allowing the conductive layer to make contact at specific locations while maintaining insulation in other areas. This segmentation resolves the contradiction by enabling both thick insulation (for RC delay reduction) and reliable contact (by creating designated contact paths through the insulating layer).
Solution Approach 2:
The contact holes act as intermediaries that bridge the gap between the thick touch insulating layer and the conductive layer. These holes provide a controlled pathway for electrical contact while allowing the insulating layer to maintain its thickness for reducing parasitic capacitance and RC delay, thus resolving the non-contact defect issue.
2Loss of time
If the touch insulating layer thickness is increased to reduce parasitic capacitance, then RC delay is reduced, but manufacturing precision becomes difficult due to non-contact phenomena
Solution Approach 1:
The insulating layer is divided into insulating regions and contact regions (defined by contact holes), allowing the system to achieve both thick insulation for low RC delay and precise contact alignment. The segmentation enables independent optimization of insulation thickness and contact positioning.
Solution Approach 2:
The contact holes are formed in advance through the touch insulating layer before the conductive layer is deposited, establishing predetermined contact paths. This preliminary action ensures that when the conductive layer is formed, it will automatically align with the pre-defined contact holes, improving manufacturing precision while maintaining thick insulation.
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
Enhances sensing sensitivity and reduces RC delay, improving touch detection accuracy and response speed while minimizing defects.
Implementation Method 1
the conductive films may include a conductive material formed through chemical vapor deposition process
Data Source
AI summary
A display device including a substrate. Pixels are disposed on the substrate. A base layer is disposed on the pixels. A first conductive pattern is disposed on the base layer. A touch insulating layer is disposed on the base layer. The touch insulating layer includes contact holes defined therein. The contact holes overlap portions of the first conductive pattern. Second conductive patterns are disposed on the touch insulating layer. Conductive films are disposed within the contact holes. A first portion of the second conductive patterns are disposed in the contact holes and are electrically connected to the first conductive pattern through the conductive films.