Touchscreen PIN Entry Using Pressure Levels and Haptic Feedback
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Solution Overview
Problem
Users, especially those who are visually impaired, face challenges in securely entering personal identification numbers (PINs) in public or crowded environments without exposing their PINs to bystanders, as existing assistive technologies may not provide sufficient privacy and security for PIN entry.
Innovation Solution
A touchscreen system that allows users to enter PINs by applying different levels of pressure, using a counter to time the pressure intervals, which enables secure PIN entry without revealing the digits on the screen, and optionally utilizes haptic feedback to aid the user in keeping track of the count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touchscreen displays PIN digits for user input, then ease of operation is improved, but security is worsened because PINs may be observed by bystanders
Solution Approach 1:
The invention extracts the visual display function from the PIN entry process. Instead of displaying PIN digits on the touchscreen, the system uses tactile feedback through haptic vibrations and audio cues to guide users through PIN entry. The touchscreen detects pressure levels and timing intervals, but does not visually reveal the entered digits, thereby maintaining security while preserving ease of operation through non-visual feedback mechanisms.
Solution Approach 2:
The invention introduces haptic feedback and audio signals as intermediary communication channels between the system and user. Instead of direct visual display, the system uses vibration patterns and sound cues to indicate successful digit entry, guiding users through the PIN input process without exposing sensitive information to visual observation by bystanders.
2Ease of operation
If assistive technology provides visual feedback for PIN entry, then ease of operation is improved for visually impaired users, but security is worsened in public environments
Solution Approach 1:
The invention replaces visual mechanical feedback systems with tactile and auditory feedback mechanisms. Instead of relying on visual displays that assistive technologies might amplify, the system uses haptic vibrations and audio signals that provide guidance without visual exposure. This substitution maintains accessibility for visually impaired users while eliminating the security risk of visual PIN exposure in public environments.
Solution Approach 2:
The invention uses haptic and audio intermediaries to communicate entry status to users. Rather than providing visual feedback that could be observed by others, the system transmits information through tactile vibrations and sound, creating a private communication channel that assists visually impaired users without compromising security in compromised environments.
3Measurement precision
If pressure sensitivity is increased to detect finer pressure levels, then measurement precision is improved, but device complexity is worsened
Solution Approach 1:
The invention applies partial action by detecting only two distinct pressure levels (first pressure level and second pressure level) rather than continuously measuring the full range of possible pressure values. This discrete threshold-based approach provides sufficient precision for the PIN entry application while avoiding the complexity of high-resolution pressure sensing systems. The touchscreen monitors pressure changes against predefined thresholds, simplifying the sensing requirements.
Solution Approach 2:
The invention changes the measurement parameter from continuous pressure magnitude to discrete pressure level transitions. Instead of measuring and processing continuous pressure values, the system detects transitions between defined pressure thresholds (first pressure level to second pressure level). This parameter transformation reduces measurement precision requirements while maintaining functional effectiveness for PIN digit capture.
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
This method allows visually impaired users and those in compromised environments to securely enter PINs without exposing them to observers, providing a secure and private way to access devices or applications by repurposing touchscreens to sense multiple pressure levels and utilize counters for PIN digit capture.
Implementation Method 1
a touch-sensitive screen to which you can apply different levels of pressure
Data Source
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AI summary
A user, particularly a user with a visual impairment, enters a security code or PIN via a touchscreen using different levels of pressure for predetermined count times. The ability to enter the entire PIN without lifting the user's finger or stylus from the touchscreen helps to prevent the user's PIN from being compromised by a bystander. A haptic feedback device may be used to aid the user to count out the correct number for each of the digits of the PIN without visual or audio feedback that may be intercepted by another party.