Conductive Multi-Touch Overlay for Small-Screen Input Accuracy
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Solution Overview
Problem
Conventional multi-touch displays with small screens make it difficult for users to accurately and quickly touch multiple designated points simultaneously, limiting the efficiency of multi-touch interactions.
Innovation Solution
A separate driving device with a capacitive multi-touch display system, featuring a conductive pattern portion with an electric charge accumulating portion, conductive connecting portions, and touching portions, is used to facilitate accurate and simple multi-touch interactions by generating a sufficient capacitance change for detection on the multi-touch display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small-scale multi-touch display is used, then the device size is reduced, but it becomes difficult for users to accurately and quickly touch multiple designated points simultaneously
Solution Approach 1:
The conductive pattern is segmented into multiple distinct touching portions (first touching portion, second touching portion, etc.) positioned at different locations. Each touching portion corresponds to a specific button on the multi-touch display, allowing users to touch multiple points simultaneously with different fingers without confusion about which point to touch first.
Solution Approach 2:
The conductive pattern is pre-configured with multiple touching portions at predetermined positions before use. The electric charge accumulating portion is pre-charged to store sufficient electric charge. This preliminary setup eliminates the need for users to figure out the correct touching sequence or positions during operation, enabling immediate accurate multi-touch input.
2Adaptability or versatility
If multiple touching points are designated beforehand on a small multi-touch display, then multi-touch functionality is enabled, but it becomes troublesome and difficult for users to correctly touch the plural touching points with plural fingers
Solution Approach 1:
Different regions of the conductive pattern have different functions: the touching portions are designed to be touched by fingers, the conductive connecting portions are optimized for charge transfer, and the electric charge accumulating portion is designed to store charge. Each portion has optimized local properties (shape, size, position) suited to its specific function, making the overall operation intuitive and easy.
Solution Approach 2:
The conductive pattern acts as an intermediary between the user's fingers and the multi-touch display buttons. Instead of directly touching the display, users touch the conductive pattern portions, which then transfer charge to the corresponding buttons. This intermediary layer simplifies the interaction by providing larger, more easily targetable touching areas while maintaining precise control over which buttons are activated.
3Measurement precision
If the touching area of each touching portion is set to at least the minimum detection area, then detection accuracy is improved, but the total area required increases
Solution Approach 1:
The conductive connecting portions are designed with dynamic charge transfer capability, allowing the system to adapt charge distribution based on which touching portions are activated. When only one touching portion is touched, charge flows efficiently from the accumulating portion through the connecting portions to activate the corresponding button, maintaining detection accuracy without requiring all touching portions to have maximum area simultaneously.
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
Enables precise and efficient multi-touch functionality on small-scale multi-touch displays by ensuring the electric charge accumulating portion receives and accumulates the required amount of electric charges for activating buttons, thereby improving the accuracy and speed of multi-touch actions.
Implementation Method 1
The electric charge accumulating portion is made of an electrically conductive body having a surface area larger than a total of the touching areas of the touching portions. The touching area of each of the touching portions is set at a value not less than a minimum detection area of the multi-touch display. The conductive connecting portion is provided on the base so as to be kept from activating a touching area of the multi-touch display by a capacitive coupling between the touching area of the multi-touch display and itself.
Implementation Method 2
The conductive connecting portion is provided on the base so as to be kept from activating a touching area of the multi-touch display by a capacitive coupling between the touching area of the multi-touch display and itself.
Data Source
AI summary
A driving device includes a base and a conductive pattern portion provided on a surface of the base. The conductive pattern portion has an electric charge accumulating portion, touching portions and conductive connecting portions connecting the accumulating portion and each of the touching portions. When a surface of the base is contacted with a multi-touch display of an information processor, each of the touching portions activates a corresponding touching area of the multi-touch display. Thus, a predetermined action is executed by the information processor.