Capacitive Detection Area Layout for Adjacent Finger Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing capacitive type input devices struggle to effectively detect the separation of objects in a column without increasing the number of Capacitor Detect Areas (CDAs), leading to errors in distinguishing two adjacent fingers.
Innovation Solution
A capacitor detection device is designed with a configuration of CDA columns, where one column consists of a first area CDA and another column consists of a second area CDA, with the second area CDA being twice or three times larger than the first area CDA. The device applies a driving voltage to the shielding capacitor and inter-line capacitor, utilizing all capacitors except the common electrode capacitor to improve object detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of CDAs is increased to distinguish two adjacent fingers, then detection precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies local quality by creating CDA columns with different area sizes (first area CDA and second area CDA with twice or three times larger area). This non-uniform local configuration allows the system to distinguish adjacent fingers through area-based differentiation rather than increasing the total number of CDAs, thus improving detection precision without proportionally increasing device complexity
Solution Approach 2:
The patent transitions from a uniform one-dimensional array of CDAs to a two-dimensional configuration with varying area sizes. By introducing the area dimension as a differentiating factor, the system can detect adjacent fingers using the same number of CDAs, effectively resolving the contradiction between detection precision and device complexity
2Measurement precision
If the number of CDAs is increased to distinguish two adjacent fingers, then detection precision is improved, but manufacturing cost increases
Solution Approach 1:
By implementing local quality variation in CDA column areas rather than uniformly increasing CDA count, the patent achieves improved finger detection precision while avoiding the proportional cost increase that would result from adding more CDAs throughout the entire input device
Solution Approach 2:
The patent applies partial action by concentrating area differentiation in specific CDA columns rather than uniformly modifying all CDAs. This selective approach achieves the necessary detection precision for adjacent fingers while minimizing the overall manufacturing cost impact
3Measurement precision
If detection sensitivity is improved by applying driving voltage to more capacitors, then detection precision is improved, but energy consumption increases
Solution Approach 1:
The patent segments the capacitor system into three distinct groups (shielding capacitor, inter-line capacitor, and common electrode capacitor) with different functional roles. By applying driving voltage selectively to only the shielding and inter-line capacitors while excluding the common electrode capacitor, the system achieves improved detection sensitivity through targeted capacitor activation rather than energizing all capacitors, thus reducing overall energy consumption
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 allows for effective object separation detection without increasing the number of CDAs, reducing costs, and improving detection sensitivity by shortening detection time and reducing consumption current.
Implementation Method 1
The capacitive type input device detects a change in capacitor that occurs when a finger or pen is adjacent to or in contact with the 'capacitor detect area' placed on the upper surface of the display part
Implementation Method 2
The device applies a driving voltage to the shielding capacitor and inter-line capacitor, utilizing all capacitors except the common electrode capacitor to improve object detection sensitivity
Data Source
AI summary
The present invention reconfigures the Capacitor Detect Area (CDA) constituting two columns to reduce the number of CDAs constituting one column and increase the number of CDAs constituting the other so that object separation operation is possible in the column in which the number of CDAs is increased.