Segmented Keyboard Keys for Accurate Handheld Input
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Solution Overview
Problem
Handheld electronic devices face usability challenges due to their compact form factor, which can lead to accidental key presses and cumbersome functionality, especially when trying to maintain traditional typing methods with reduced keypads and increased functions, resulting in confusing tactile feedback and inefficient disambiguation solutions.
Innovation Solution
A keyboard design with elongated keys structured to engage multiple contacts, including a primary, secondary, and tertiary contact, coupled with a processor running a disambiguation routine that favors the indicia associated with the engaged contact, displaying a list with favored combinations at the top, reducing the number of metal domes and allowing for a narrower keypad.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of keys is reduced to maintain a compact form factor, then the device size is reduced, but the number of functions each key must serve increases leading to ambiguous input
Solution Approach 1:
The key is segmented into multiple pressable regions (first region and second region) that can be independently activated. Each region is associated with different functions or characters, allowing a single physical key to serve multiple purposes without ambiguity. The segmentation enables distinct tactile feedback for each region, resolving the input ambiguity problem while maintaining key reduction.
Solution Approach 2:
The invention adds a spatial dimension to key input by dividing the key surface into multiple functional regions. Instead of using multiple separate keys or requiring combination presses, the solution creates lateral differentiation across the key surface, allowing users to select different functions by pressing different regions of the same key.
2Ease of operation
If traditional QWERTY layout is maintained with reduced keys, then user familiarity is preserved, but accidental simultaneous pressing of multiple keys increases due to key closeness
Solution Approach 1:
Each key is divided into distinct pressable regions with clear spatial separation. This segmentation prevents accidental simultaneous activation of multiple regions on the same key, as users can selectively press only the intended region. The physical separation of functional regions within each key reduces the likelihood of erroneous multi-region presses while maintaining the compact QWERTY layout.
3Ease of operation
If disambiguation software is used to suggest characters, then traditional typing method is preserved, but the system complexity increases and accuracy is insufficient
Solution Approach 1:
The invention replaces software-based disambiguation with a mechanical input differentiation system. Instead of relying on complex algorithms to guess user intent, the physical key structure itself provides unambiguous input through regional segmentation. Each region's activation directly determines the input character or function, eliminating the need for software guessing games and reducing system complexity.
4Quantity of substance
If elongated keys are used to engage multiple contacts, then the number of metal domes is reduced, but the keyboard width increases
Solution Approach 1:
The invention segments the key activation function across multiple regions of the same key rather than requiring separate keys or elongated structures. Each region can engage its own contact point, allowing compact key arrangement while maintaining multiple contact engagements per key press. This approach reduces the total number of metal domes needed compared to having separate keys for each function.
Solution Approach 2:
Each key is designed to serve multiple functions through its segmented regions, making a single key structure universal for multiple input purposes. This multi-functionality at the key level reduces the overall number of components (metal domes) required in the system, as one key replaces what would traditionally require multiple separate keys or contact mechanisms.
Data Source
AI summary
A handheld electronic device and an associated method are provided. The handheld electronic device includes a keyboard assembly, a display positioned adjacent the keyboard assembly, a processor structured to receive inputs from the keyboard assembly and to output to the display as a function of the inputs, the processor further structured to run a disambiguation routine. The keyboard assembly includes a printed circuit board, a primary conductor portion, a secondary conductor portion, and a keyboard assembly. The printed circuit board has a plurality of electrical contacts. The conductor assembly has a plurality of primary conductors and a plurality of secondary conductors, each the primary conductor and secondary conductor structured to correspond to, and engage and close, at least one of the plurality of electrical contacts. The keyboard assembly has a plurality of keys each having one or more indicia thereon. The plurality of keys are disposed in a first set of keys and a second set of keys, wherein each key in the first set of keys is coupled to, and structured to engage, a first number of conductors, and, each key in the second set of keys is coupled to, and structured to engage, a second number of conductors wherein the second number is different than the first number.