Predictive Keypad Text Entry for Self-Service Terminals
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Solution Overview
Problem
Self-service terminals like ATMs have limitations in functionality due to their small size and simplicity, which restricts tasks such as transferring money and updating account details, and they face security concerns with users vulnerable to physical and data theft while entering PINs.
Innovation Solution
A multi-button input device with processing circuitry that allows for both number and text entry modes, using predictive text input to select the most probable letter based on context, enabling increased functionality without physical changes to the terminal and enhancing user safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a keyboard is added to increase terminal functionality, then text entry capability is improved, but device complexity and installation cost increase
Solution Approach 1:
The existing multi-button input device is made universal by enabling it to perform both number entry and text entry functions. The button is associated with both a number and multiple alphabetic letters, allowing the same physical component to serve multiple purposes depending on the input mode selected.
Solution Approach 2:
The invention leverages the familiar multi-tap input concept from mobile phones, where number keys are associated with letters. This copying of a well-known interface pattern allows users to intuitively understand text entry without requiring a complete new interaction model, reducing the cognitive complexity burden.
2Adaptability or versatility
If multi-tap input is used for text entry, then text input capability is provided, but data entry time increases
Solution Approach 1:
The system provides feedback by displaying the most probable completion as the user types, allowing them to see how their input is being interpreted in real-time. This enables early termination of input when the predicted completion is correct, significantly reducing data entry time compared to waiting for complete multi-tap sequences.
Solution Approach 2:
The system performs preliminary action by predicting the user's intended input based on the letters typed so far and displaying the most probable completion before the user finishes typing. This allows the user to accept the prediction early rather than completing the full multi-tap sequence, saving time.
3Productivity
If predictive text input is implemented, then data entry speed is improved, but processing complexity increases
Solution Approach 1:
The system changes the parameter of button association by linking each button to both a number and multiple alphabetic letters. This parameter change enables the same physical button to serve dual purposes, allowing predictive text functionality without adding separate hardware components.
Solution Approach 2:
The input device operates dynamically by switching between number entry mode and text entry mode. In text mode, the system dynamically updates the predicted completion as each letter is typed, adjusting the display in real-time based on the evolving input sequence.
Data Source
AI summary
A self-service terminal alphanumeric data entry device comprises a multi-button input device and processing circuitry comprising a letter selector. At least one of the buttons is associated with a number and with at least two alphabetic letters. The input device is arranged to operate in a number entry mode wherein actuation of a button inputs the number associated therewith and a text entry mode. In the text entry mode, actuation of a button causes the letter selector to chose, from the letters associated with that button, the letter which has the highest probability of forming a word.