Touch Panel Resolution Adjustment for Pointer Stability
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Solution Overview
Problem
Capacitance type touch panels experience wobbling of the display pointer or screen and jagged line drawing when an operating finger is immobilized or used in drawing mode, due to insufficient resolution and noise interference.
Innovation Solution
An electronic device with a touch panel that adjusts its resolution based on the vertical distance between the touch panel and the finger, using a capacitance type touch panel to detect two-dimensional coordinates and perform a rounding process to enhance coordinate precision, and optionally divides the touch panel region for finer output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a capacitance type touch panel is used for hover operation, then touchless operation is enabled, but the display pointer wobbles and the screen display wobbles when the operating finger is immobilized
Solution Approach 1:
The patent applies dynamics by making the resolution parameter adjustable based on the detected vertical distance. The system dynamically changes the resolution of two-dimensional coordinates according to the finger's distance from the panel, allowing the touch panel to adapt its detection precision to the operating conditions, thereby maintaining display stability during hover operations while preserving touchless operation capability
Solution Approach 2:
The patent changes the resolution parameter of coordinate detection based on the vertical distance between the finger and the touch panel. When the finger is closer to the panel, higher resolution is applied to reduce pointer wobble, while maintaining lower resolution at greater distances to conserve processing resources, thus resolving the contradiction between touchless operation and display stability
2Ease of operation
If a capacitance type touch panel is used for hover operation, then touchless operation is enabled, but the line drawing appears jaggedly when using drawing mode
Solution Approach 1:
The system dynamically adjusts the resolution parameter based on the detected vertical distance during drawing operations. When the finger is positioned closer to the panel surface, the system applies higher resolution to coordinate detection, ensuring smooth line drawing without jagged edges, while maintaining touchless operation capability through hover detection
Solution Approach 2:
The patent changes the resolution parameter of two-dimensional coordinates according to the vertical distance detected by the capacitance touch panel. This parameter adaptation ensures that during drawing mode with finger hover, the coordinate precision is sufficient to produce smooth lines rather than jagged edges, while preserving the benefits of touchless operation
3Device complexity
If fixed resolution is used in touch panel, then device complexity is reduced, but the coordinate precision is insufficient causing pointer wobble
Solution Approach 1:
Rather than using a fixed complex high-resolution system, the patent implements a dynamic resolution system that adapts to the operating distance. This approach reduces overall device complexity by using lower resolution at typical distances while providing high precision only when needed (when the finger is very close to the panel), thus resolving the contradiction between simplicity and precision
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
The solution ensures a stable display pointer and smooth line drawing by increasing the resolution of two-dimensional coordinates as the vertical distance decreases, preventing wobbling and jagged lines, even when the finger is immobilized or in drawing mode.
Implementation Method 1
a capacitance type touch panel that can be operated at a height in a predetermined range (hereinafter, this proximity operation will be referred to as a 'hover operation') without touching a panel surface with a finger
Implementation Method 2
When the driving pulse is applied, an electric field is generated. When a hand enters the electric field, the number of electric force lines between the transmission electrode 101 and the reception electrode 102 is decreased. A change in the number of electric force lines appears as a change in charges in the reception electrode 102.
Data Source
AI summary
Provided is an electronic device. The electronic device includes a planar display unit, and a touch panel which is disposed so as to overlap the display unit and is capable of detecting a vertical distance between two-dimensional coordinates along a surface of the display unit and a finger. Resolution of the two-dimensional coordinates becomes finer as the vertical distance decreases. Thus, even when the operating finger is immobilized in a state where the electronic device is fixed, a display of a pointer is not wobbled or a display of a screen is not wobbled. In addition, when a line is drawn using a drawing mode, the line is not displayed jaggedly.