Capacitive Keypad Navigation for Space-Limited Mobile Text Entry
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Solution Overview
Problem
Current mobile devices face challenges in minimizing input device space while maintaining efficient user control for character input, as traditional keyboards and navigation tools often require substantial space and hinder display visibility due to their size and layout.
Innovation Solution
Integration of a capacitance-sensitive cursor navigation area within the keyfield that allows for sweeping motion-based navigation across alphabetic input keys, enabling simultaneous text entry and cursor control without the need for separate navigation tools, and utilizing a trackball for two-dimensional screen movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional separate navigation devices (trackballs, rotating wheels) are added to the mobile device, then user control and ease of operation are improved, but the device size and space requirements increase
Solution Approach 1:
The patent combines the navigation function with the existing keyboard by making the keyboard keys sensitive to sweeping motions. The same physical keys that input characters are also used for cursor navigation through detection of sweeping contact patterns, eliminating the need for separate navigation devices like trackballs or rotating wheels.
Solution Approach 2:
The keyboard keys are designed to perform multiple functions: character input through pressing and cursor navigation through sweeping motions. This multi-functionality allows the same physical structure to serve both text entry and navigation purposes, reducing the overall space required on the device.
2Area of stationary object
If the keyboard size is reduced to fit smaller devices, then device portability is improved, but the space available for navigation devices is reduced
Solution Approach 1:
The navigation function is merged into the keyboard structure itself. By detecting sweeping motions across the keyboard keys, the system enables cursor control without requiring additional navigation hardware, thus preserving keyboard space while maintaining navigation capability.
Solution Approach 2:
The keyboard serves dual purposes: character input and cursor navigation. This eliminates the need for separate navigation devices and maximizes the use of available keyboard space, allowing smaller device dimensions without sacrificing operational capability.
3Ease of operation
If separate navigation devices are placed proximate to the keyboard, then user control is improved, but the display screen space is reduced
Solution Approach 1:
The navigation function is integrated into the keyboard area rather than placing separate navigation devices near the display. This keeps the display screen unobstructed while providing navigation control through the keyboard's sweeping motion detection capability.
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 configuration minimizes space required for input devices, enhances user control, and ensures unobstructed display visibility during data entry by integrating navigation functions into the keyboard area, allowing for efficient and intuitive character selection and cursor movement.
Implementation Method 1
a cursor navigation area 72 coincident with at least a portion of the plurality of alphabetic input keys 630. The cursor navigation area 72 is capacitance sensitive
Data Source
AI summary
A handheld electronic communication device includes a plurality of text entry keys arranged in a keyfield. A user navigates among alphabetic selections shown on a display by moving his fingers across keys lying within a navigation travel region and other wise generally used to effect text entry into the device.