Display Screen Privacy Mode Verification via Light Guide Sensor
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Solution Overview
Problem
Existing display screens that operate in two modes, free and restricted viewing, cannot automatically verify the privacy mode in case of component failures, such as LED or electronic control circuitry issues, which is critical for transaction-relevant systems like ATMs or payment terminals.
Innovation Solution
A method and arrangement that uses a control unit to switch between free and restricted viewing modes by adjusting light sources and determining brightness values using a light-sensitive sensor, allowing for automatic verification of the operating mode without user intervention, and influencing image content based on brightness and contrast adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a display screen uses a light guide for restricted viewing mode without lateral light sources, then privacy quality is improved, but automatic verification capability deteriorates due to inability to detect component failures
Solution Approach 1:
A light-sensitive sensor is introduced as an intermediary component to detect light from the light guide. This sensor enables automatic verification of the restricted viewing mode by measuring light intensity, thereby resolving the contradiction between maintaining privacy quality and enabling automatic detection of component failures.
Solution Approach 2:
The system implements feedback by using the light-sensitive sensor to continuously monitor the light guide's output and comparing it against expected values. This feedback mechanism allows automatic detection of component failures (such as LED or electronic control circuitry issues) while maintaining the privacy quality of the restricted viewing mode.
2Reliability
If a display screen implements automatic verification of privacy mode, then reliability is improved, but device complexity increases due to additional components
Solution Approach 1:
The light-sensitive sensor serves multiple functions: it verifies the restricted viewing mode, detects component failures, and can potentially control the switching between viewing modes. This multi-functionality reduces the need for separate verification systems, thereby limiting the increase in device complexity while improving reliability.
Solution Approach 2:
The display screen performs self-verification by using its own light sources and a simple light-sensitive sensor to automatically detect the operational status of the privacy mode. This self-service capability improves reliability without requiring external verification equipment or complex additional structural elements.
3Illumination intensity
If a display screen uses CCFL tubes with prism rasters and diffusors for homogeneous illumination, then image quality is improved, but the solution is not suited for characterizing privacy quality and is restricted to specific display types
Solution Approach 1:
The invention extracts the essential verification function from the specific CCFL tube system with prism rasters and diffusors. By using a light-sensitive sensor to detect light from the light guide, the solution becomes applicable to various display types (LED, OLED, etc.) while maintaining the ability to characterize privacy quality, thus improving adaptability without sacrificing image quality verification.
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
Enables automatic verification of the display screen's operating mode, ensuring privacy and reliability in transaction-relevant systems by determining the quality of the restricted viewing mode without requiring user presence or additional structural components.
Implementation Method 1
A) Determining the brightness value H at least at one point P of at least one surface and/or edge of the transparent light guide
Data Source
AI summary
A method for checking an operating mode of a display screen switchable between a free-viewing operating mode B1 and a restricted-viewing operating mode B2, comprising: in operating mode B2, determining a brightness value H of a surface and/or edge of a transparent light guide; then, depending on the brightness value H: i) unchanged use of operating mode B2 if the brightness value lies within a range of specified Hg values; ii) switching off operating mode B2 if the brightness value lies within a range of specified Hs values; or iii) changed use of operating mode B2 if the brightness value lies within a range of specified Hm values, with the control unit exerting an influence on the image content perceptible on the display screen by reducing the latter's brightness and/or contrast, with the range Hm lying between the ranges Hs and Hg, and with the ranges bordering on each other.