Touch Panel Detection Lines Segmentation for Resolution
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Solution Overview
Problem
Existing touch panel-equipped display devices using electrostatic capacitance systems face challenges in improving detection resolution without increasing the number of wires, as reducing the pitch of detection lines degrades detection sensitivity and requires complex software processes.
Innovation Solution
The implementation of a touch panel-equipped display device with a configuration of main detection lines and sub-detection lines arranged in a specific pattern, where sub-detection lines are connected on both sides of main detection lines, allowing for improved detection resolution while maintaining a reduced number of wires by placing unused detection lines in a high impedance state during touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pitch of detection lines is reduced to improve detection resolution, then detection resolution is improved, but detection sensitivity degrades due to reduced fringe capacitance
Solution Approach 1:
The detection lines are segmented into main detection lines and sub-detection lines. The main detection lines maintain larger pitch for sufficient fringe capacitance and detection sensitivity, while sub-detection lines are positioned between main lines to provide additional resolution. This segmentation allows different parts of the detection line system to serve different functions: main lines for sensitivity and sub-lines for resolution enhancement.
Solution Approach 2:
The invention adds sub-detection lines in the spatial dimension between existing main detection lines, effectively creating a multi-layer detection structure. This dimensional approach allows resolution improvement without reducing the pitch of primary detection lines, thereby maintaining fringe capacitance and detection sensitivity while achieving finer position detection capability.
2Measurement precision
If the pitch of detection lines is reduced to improve detection resolution, then detection resolution is improved, but the number of detection wires increases requiring larger frame region
Solution Approach 1:
Multiple sub-detection lines that would normally require separate wire connections are electrically connected and merged into a single common wire. This allows the detection system to utilize sub-detection lines for improved resolution while using fewer wire connections, thereby reducing the frame region requirement and simplifying the overall wiring structure.
Solution Approach 2:
The detection line system is designed with multi-functionality where main detection lines handle primary detection tasks requiring high sensitivity, while sub-detection lines provide additional resolution enhancement. The system can selectively activate different line configurations based on detection needs, making the wire infrastructure more versatile and reducing the total number of wires required.
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 enhances detection resolution without increasing the number of wires, maintaining detection sensitivity and eliminating the need for complex software processes to improve resolution, making it suitable for devices with restrictive appearances like smartphones.
Implementation Method 1
A touch panel using an electrostatic capacitance system may be used as a touch panel for a touch panel-equipped display device. In this touch panel, of capacitance to be generated between scanning electrodes (scanning lines) arranged in a lattice shape inside a display region and detection electrodes (detection lines), fringe component capacitance differs between when the panel is touched and when the panel is not touched, and a panel touch position is detected on the basis of the difference in fringe component capacitance.
Data Source
AI summary
Disclosed is a touch panel-equipped display device capable of suppressing an increase in the number of wires and improving detection resolution. A touch panel-equipped display device includes scanning lines and detection lines. The detection lines include first main detection lines, second main detection lines, first one-side sub-detection lines, and first other-side sub-detection lines. Each of the second main detection lines is arranged between adjacent first main detection lines. The first one-side sub-detection lines are connected together, and each first one-side sub-detection lines is arranged between the corresponding first main detection line and the second main detection line adjacent to one side of the corresponding first main detection line. The first other-side sub-detection lines are connected together, and each first other-side sub-detection lines is arranged between the corresponding first main detection lines and the second main detection line adjacent to the other side of the corresponding first main detection line.