Touch Sensor Electrode Capacitance Adjustment via Unconnected Lines
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The initial electrostatic capacitance between touch sensor electrodes in display devices can be either too large, leading to measurement errors from small capacitance changes, or too small, causing noise to be misinterpreted as touch inputs, and existing configurations require structural changes in electrode lines to adjust this range, which is undesirable.
Innovation Solution
Incorporating unconnected lines in the touch sensor electrode design allows for adjustment of the initial electrostatic capacitance by varying the number of connected and unconnected lines, minimizing structural changes and optimizing the capacitance range for accurate touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the initial electrostatic capacitance between electrodes is increased, then the measurement range is improved, but measurement precision deteriorates due to small capacitance changes being taken as errors
Solution Approach 1:
The patent applies parameter changes by adjusting the initial electrostatic capacitance value to an optimal range that balances measurement range and precision. By controlling the initial capacitance between electrodes, the system can detect small capacitance changes caused by touch while avoiding measurement errors, thus resolving the contradiction between measurement range and precision.
2Measurement precision
If the initial electrostatic capacitance between electrodes is decreased, then measurement precision is improved, but reliability deteriorates as noise is misinterpreted as touch input
Solution Approach 1:
The patent uses parameter changes by optimizing the initial electrostatic capacitance value to a specific range that prevents noise misinterpretation while maintaining reliable touch detection. This optimal parameter setting ensures that genuine touch-induced capacitance changes are distinguished from noise, resolving the contradiction between measurement precision and reliability.
3Adaptability or versatility
If structural changes are made to electrode lines to adjust capacitance range, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by adjusting the initial electrostatic capacitance through controlled electrode configurations rather than complex structural modifications. This approach achieves capacitance range adaptation while minimizing increases in device complexity, as the parameter optimization can be done within existing electrode designs.
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 approach enables the initial electrostatic capacitance to be adjusted to an optimal range, reducing measurement errors and noise misinterpretation, while minimizing structural changes in the electrode lines, thus enhancing the accuracy and reliability of touch detection.
Implementation Method 1
When a finger or the like touches the control surface of the display device, the touch is detected as a change in the electrostatic capacitance between the drive electrode and the sensing electrode
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A touch sensor electrode is provided with a first electrode layer, a second electrode layer, and a transparent dielectric substrate. The first electrode layer has a plurality of first strip electrodes arranged being spaced along a first array direction, in which each of the plurality of first strip electrodes includes a first pad and a first line group including a plurality of first electrode lines. The second electrode layer has a plurality of second strip electrodes arranged being spaced along a second array direction orthogonal to the first array direction, in which the plurality of second strip electrodes each include a second pad and a second line group including a plurality of second electrode lines. As viewed perpendicular to the transparent dielectric substrate, one cell is a region in which one first line group three-dimensionally crosses one second line group, and the cells are arranged along the second array direction in each of the plurality of first strip electrodes. The cell placed closest to the first pad in the first strip electrodes is a first closest cell. The first line group includes, in the first closest cell, a first unconnected line that is not connected to the first pad and a first connected line that is connected to the first pad.