Touchscreen Display Brightness Sensing for Graphic Verification
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Solution Overview
Problem
Existing touchscreen operator control and display devices in motor vehicles, particularly for autonomous driving, face challenges in ensuring the correct representation of graphics elements and detecting defective display elements, which is crucial for user safety and meeting ASIL C requirements.
Innovation Solution
Incorporating a sensor that detects changes in brightness on the display element, either through changes in electrical resistance or the photoelectric effect, to identify incorrect or defective display elements, enhancing the device's functional reliability and user safety by using a light-dependent parallel resistance or a photoelectric effect-based coating applied via a printing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor is added to detect brightness changes on the display element, then the reliability of display verification is improved, but the device complexity increases
Solution Approach 1:
The patent combines the sensor layer with the display element structure, integrating the brightness detection function into the existing display architecture. The sensor is positioned between the display element and the user, merging multiple functions (display and detection) into a unified structure rather than adding separate independent components.
Solution Approach 2:
The sensor serves multiple functions: it detects brightness changes to verify display correctness, identifies defective display elements, and enables the display element to serve both as information presentation and self-verification components. This multi-functionality reduces the need for separate verification systems.
2Ease of manufacture
If a coating is applied to the display element for sensor functionality, then the manufacturing process is simplified, but the transmission of light radiation may be reduced
Solution Approach 1:
The patent optimizes the coating parameters including material composition and thickness to achieve the desired balance. By adjusting these parameters, the coating provides sufficient sensor functionality while maintaining adequate light transmission for display visibility.
Solution Approach 2:
The patent employs composite material structures where the coating is integrated with the display element layers. This composite approach allows the coating to provide sensor functionality while the overall structure maintains optical performance through careful material selection and layer configuration.
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
The solution ensures increased functional reliability of the operator control and display device, meeting ASIL C requirements, allowing for safe operation in critical applications like autonomous vehicles by effectively detecting and addressing any display issues.
Implementation Method 1
The sensor detects changes in brightness by a change in the electrical resistance on the display element
Implementation Method 2
The sensor can detect changes in brightness by the photo effect, by the release of electrons upon incidence of light
Data Source
AI summary
A touch screen operator control and/or display device (1), for a motor vehicle has a display element (2). At least one graphics element (3) can be represented on the display element (2) by visible light radiation. A sensor (4) detects the representation of the graphics element (3). The sensor (4) detects in particular, changes in brightness on the display element (2).