Concentric Radial Keypad Layout for Single-Thumb Text Entry
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Solution Overview
Problem
Conventional text entry devices, such as those on cell phones and gaming consoles, face challenges in providing an efficient and error-reduced method for users to input text, particularly due to awkward thumb and finger extensions and the close proximity of keys, which leads to inadvertent key strikes.
Innovation Solution
A text entry device with a radial keypad layout where letters are arranged in concentric groupings extending from a central point, allowing each letter to be actuated by a single thumb with improved speed and accuracy, and incorporating features like concave key surfaces and color differentiation to enhance usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a QWERTY keypad layout is used, then text entry speed is improved, but thumb and finger extension becomes awkward and exceeds natural movements
Solution Approach 1:
The patent transitions from a traditional linear QWERTY keyboard layout to a radial/circular arrangement where keys are positioned around a central point. This dimensional reorganization allows the thumb to naturally reach all keys through rotational movement rather than linear extension, solving the ergonomic problem while maintaining quick access to all letters
2Area of stationary object
If the keypad is reduced in size to fit certain electronic devices, then device compactness is improved, but thumb and finger extension becomes awkward and inadvertent key strikes increase
Solution Approach 1:
By arranging keys radially around a central point instead of in a compact linear grid, the patent creates natural spacing between keys that prevents accidental presses while maintaining a small overall footprint. The radial geometry distributes keys evenly around the center, ensuring adequate separation without increasing the device's dimensional envelope
Solution Approach 2:
The patent applies different spacing characteristics to different regions of the keypad. Keys are positioned at optimized radial distances from the center, with outer keys having sufficient separation to prevent accidental presses while inner keys remain easily accessible. This localized optimization of key placement resolves the contradiction between compactness and error prevention
3Device complexity
If alpha-numeric layout with multiple letters per key is used, then device complexity is reduced, but text entry accuracy decreases due to multiple taps required
Solution Approach 1:
The patent segments the alphabet into individual letter keys arranged radially, with each key containing a single letter. This segmentation eliminates the need for multiple taps to select different letters, as each key press directly inputs the desired character, thereby improving text entry accuracy while maintaining reasonable device complexity
Data Source
AI summary
A text entry device is provided. The device includes a concentric and a first grouping of letters including the letters A, B, C and D and that has at least one key that is touched by a user when actuated. A second grouping of letters including the letters E, F, G and H is included and has at least one key that is touched by the user when actuated. At least a portion of the key of the first grouping is located at a different angular position with respect to the concentric than at least a portion of the key of the second grouping.