Keypad Layout Using Dictionary Order and Frequency-Based Character Input
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Solution Overview
Problem
Current small-sized keypads for mobile devices, such as cellular phones and PDAs, face challenges in efficiently inputting characters due to the need for multiple button presses for frequently used characters and the lack of function keys, leading to increased operational complexity and errors, especially for novice users.
Innovation Solution
A character and function key input device is designed with a keyboard layout that incorporates function keys and character buttons arranged according to dictionary order and frequency of use, utilizing forward and backward buttons to reduce the number of button selections and enable easier input of characters, including the use of circular conversion schemes for languages like Korean and English.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If characters are arranged in simple dictionary order on small-sized keypad, then the layout is simple and easy to understand, but frequently used characters require multiple button presses increasing input time
Solution Approach 1:
The patent changes the arrangement parameter of characters on the keypad from simple dictionary order to a hybrid arrangement that combines dictionary order with frequency of use. High-frequency characters are positioned on easily accessible keys (1-4), while maintaining overall dictionary order progression. This parameter change resolves the contradiction by optimizing both layout simplicity and input speed simultaneously.
2Loss of time
If high-frequency characters are placed on easily accessible keys, then input speed increases, but the layout becomes complex and harder to learn
Solution Approach 1:
The patent modifies the arrangement parameter to create a hybrid system where high-frequency characters (E, T, A, O, I, N, S, H, R) are strategically placed on keys 1-4, but the overall structure maintains dictionary order progression. This controlled parameter change achieves faster input without excessive complexity.
Solution Approach 2:
The patent applies local quality by creating different arrangement patterns for different regions of the keypad. Keys 1-4 contain high-frequency characters for quick access, while keys 5-9 follow more traditional dictionary order. This localized differentiation optimizes input speed for common characters while maintaining learnability through predictable patterns.
3Adaptability or versatility
If traditional English input scheme is used on small keypad, then character input is possible, but function keys are missing reducing operational versatility
Solution Approach 1:
The patent implements multi-functionality by designing keypad keys to serve dual purposes: character input and function key operations. Each key (1-9) can access both alphabetic characters and functional operations, eliminating the need for separate function key rows. This universal design increases adaptability without proportionally increasing physical complexity.
Solution Approach 2:
The patent merges character input functionality and function key functionality into a single integrated keypad structure. By combining these previously separate functions into one unified interface, the system achieves greater versatility while maintaining a compact, simple layout.
4Quantity of substance
If multiple button presses are required for character input, then all characters can be accommodated, but the number of operations increases reducing productivity
Solution Approach 1:
The patent changes the distribution parameter of characters across keys, ensuring that high-frequency characters require only 1-2 button presses while low-frequency characters may require 3-4 presses. This optimized distribution maintains complete character coverage while significantly improving average input efficiency based on actual usage patterns.
Solution Approach 2:
The patent modifies the access depth parameter by positioning frequently used characters shallower in the input sequence (requiring fewer button presses) and less frequently used characters deeper in the sequence. This parameter optimization ensures full character coverage while maximizing input productivity for common characters.
Data Source
AI summary
A character and function key input device comprises: a character button unit having character buttons, each of which is assigned to one or more characters of one or more languages or function key elements; a forward button which converts the character or function key element selected from among the characters or the function key elements into characters or function key elements assigned to the selected button or adjacent button in accordance with the dictionary order; and a backward button which converts the character or function key element selected from among the characters or the function key elements into characters or function key elements assigned to the selected button or adjacent button in accordance with the dictionary order, wherein said one or more characters or function key elements assigned to the character buttons are disposed adjacently to one other in the dictionary order, and the character or the function key element having the highest use frequency is used as a basic value. The dictionary order has a circulation configuration such that the first character or the first function key element appears again after the last character or the last function key element.