Touch Screen Layout Encryption and Parallax Correction
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Solution Overview
Problem
Touch screen displays in secure environments, such as automated banking machines, face challenges in ensuring the authenticity and security of touch screen layouts, particularly in preventing unauthorized access and compensating for parallax errors that affect touch input accuracy.
Innovation Solution
Implementing an encryption method for touch screen layouts using a key associated with the device, authenticating the layout before use, and employing parallax correction techniques to accurately determine touch inputs by assigning a touch area adjacent to the perimeter of visually generated images, considering mechanical tolerances and worst-case variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch screen layout authentication is implemented using encryption keys, then security against unauthorized access is improved, but device complexity increases
Solution Approach 1:
The touch screen layout is authenticated in advance before being loaded onto the device. The authentication process verifies the layout's integrity and origin using encryption keys prior to deployment, ensuring that only authorized layouts are installed. This preliminary verification prevents unauthorized access without requiring continuous complex authentication mechanisms during operation.
Solution Approach 2:
An authentication module acts as an intermediary component that mediates between the touch screen layout and the device's processing units. This dedicated module handles the encryption and decryption operations, isolating the complex cryptographic functions from the main device architecture and simplifying the overall system design.
2Measurement precision
If parallax correction is applied by assigning extended touch areas, then touch input accuracy is improved, but the area available for functional elements is reduced
Solution Approach 1:
The parallax correction is applied locally at the boundaries of functional elements rather than uniformly across the entire touch screen. Extended touch areas are assigned specifically at the perimeter regions where parallax effects are most problematic, allowing accurate touch detection at critical boundaries while preserving the central areas for functional content.
Solution Approach 2:
Instead of applying parallax correction to the entire touch screen uniformly, the correction is partially applied only to the perimeter regions surrounding functional elements. This partial action approach compensates for parallax effects where they matter most (at boundaries) while minimizing the impact on the overall area available for functional elements.
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
Enhances security by ensuring only authorized layouts are used, and improves touch input accuracy by compensating for parallax and mechanical errors, thereby protecting sensitive transactions from unauthorized access and ensuring reliable user interactions.
Implementation Method 1
determining an amount of parallax for an electronically generated visual image on a display surface that passes through and airgap between the display and a touch screen medium
Data Source
AI summary
In accordance with an example embodiment there is disclosed herein a method for authenticating a touch screen layout. A file containing the touch screen layout is signed by a key known to the device that is to deploy the touch screen layout, such as, for example an automated banking machine and/or a point of sale system. Before the touch screen is used by the device's user interface, the device validates the touch screen.