Capacitive Touch Panel Shared Scan Line Design
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Solution Overview
Problem
The increasing number of detection units in capacitive touch panels to achieve higher touch resolution leads to a rise in manufacturing costs due to the need for more scan lines, making it challenging to produce cost-effective high-resolution touch panels.
Innovation Solution
A capacitive touch panel design that incorporates a touch detection array with alternating rows of first and second direction detection units, utilizing shared and independent scan lines, and a driver control module to detect touch inputs by comparing signals from shared and independent scan lines, reducing the overall number of scan lines required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of detection units is increased to achieve higher touch resolution, then touch resolution is improved, but the number of scan lines must also be increased which raises manufacturing costs
Solution Approach 1:
The patent merges the scanning function into the data line by making the data line serve dual purposes: carrying data signals and serving as a scan line for activating detection units. This eliminates the need for separate scan lines, reducing the number of conductive layers and simplifying the overall structure while maintaining high touch resolution through increased detection units
Solution Approach 2:
The data line is designed to perform multiple functions simultaneously: it acts as both a data transmission line and a scan line for activating detection units. This multi-functionality reduces the total number of conductive elements required in the panel while enabling high-resolution touch detection through additional detection units
2Measurement precision
If the number of scan lines is increased to support more detection units, then touch resolution is improved, but manufacturing costs rise
Solution Approach 1:
The patent combines the scan line function with the data line function, eliminating the need for separate scan lines. This reduces the number of conductive layers and manufacturing steps, lowering production costs while still supporting high-resolution touch detection through increased detection units
Solution Approach 2:
The data line is designed to serve multiple purposes: data transmission and scan line activation. This multi-functionality reduces the total number of conductive elements and manufacturing steps, making high-resolution touch panels more cost-effective to produce
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 design reduces the number of scan lines and drive channels, lowering manufacturing costs while maintaining high resolution, and allows for increased scan frequency, enhancing detection efficiency.
Implementation Method 1
The capacitive touch panel is one type of touch panel that determines the location of a touch input according to a detection of a voltage drop, in which said voltage drop is generated by a capacitance change of the panel caused by the touch input
Data Source
AI summary
A capacitive touch panel comprises a touch detection array having rows of first direction detection units and columns of second direction detection units, shared scan lines, independent scan lines and a driver control module. The first direction detection units are divided into a first group and a second group of rows arranged in an alternating manner. Each shared scan line is connected to one row of the first direction detection units in the first group and one column of the second direction detection units. Each independent scan line is connected to one row of the first direction detection units or one column of the second direction detection units that is not connected to the shared scan lines. The driver control module is connected to the shared scan lines and the independent scan lines to perform scanning processes to detect a touch input. A touch detection method is also disclosed.