Protective Screen Damage Detection Using Display Illumination Feedback
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Solution Overview
Problem
Existing display devices with optical displays are vulnerable to vandalism, leading to damage of the transparent protective screen, which impairs data display and user interaction, and current sensor arrangements are complex, energy-intensive, and unreliable in detecting various types of damage, especially when the screen is coated with paint or stickers.
Innovation Solution
A display device that uses the existing display illumination as a sensor light source, employing light sensors on the narrow sides of the transparent protective screen to detect changes in reflection behavior and light intensity, coupled with an analysis module that evaluates these signals synchronously with control signals to reliably detect damage, including minor alterations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a transparent protective screen is placed in front of the optical display, then the electronic components are protected from damage, but the data content becomes unreadable or only partially recognizable when the protective screen is damaged
Solution Approach 1:
The sensor arrangement detects damage to the transparent protective screen before it significantly impairs display functionality. By performing preliminary detection, the system can alert users or operators to replace or repair the damaged protective screen, preventing complete loss of readability and maintaining information accessibility throughout the protective screen's service life
Solution Approach 2:
The evaluation module continuously monitors light transmission through the transparent protective screen and provides feedback about its condition. This feedback mechanism enables real-time detection of damage, allowing the system to maintain optimal display readability by triggering alerts or adjustments before the protective screen damage becomes severe enough to compromise data content readability
2Reliability
If a sensor arrangement with sensor light source and sensor light receiver is used to detect damage, then damage detection capability is provided, but the device complexity and energy consumption increase
Solution Approach 1:
The display illumination serves dual functions: it illuminates the display for normal operation and simultaneously acts as the light source for damage detection. This multi-functionality eliminates the need for a separate sensor light source, reducing device complexity and energy consumption while maintaining reliable damage detection capability
Solution Approach 2:
The display illumination automatically serves the additional purpose of enabling damage detection without requiring separate dedicated components. The existing display illumination system provides the necessary light for both display functionality and sensor operation, making the damage detection system self-sufficient and reducing overall system complexity
3Reliability
If the sensor light source is positioned along the entire length of a narrow side of the transparent protective screen, then comprehensive damage detection is achieved, but the device complexity and manufacturing cost increase
Solution Approach 1:
Instead of uniformly distributing the sensor light source along the entire narrow side, the invention positions a single sensor light source at a specific location where it can effectively monitor the entire transparent protective screen through strategic light transmission paths. This localized approach maintains comprehensive detection capability while dramatically simplifying manufacturing
Solution Approach 2:
The invention uses the display illumination as an intermediary that mediates between the sensor light source and the transparent protective screen. By positioning the sensor light source to detect light that has transmitted through the protective screen after being emitted by the display illumination, the system achieves comprehensive damage detection with minimal components, avoiding the need for complex arrangements along the entire screen perimeter
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 enables reliable detection of various damage types with reduced effort and energy consumption, allowing for timely repair and maintaining display functionality by adjusting content presentation based on damage location and severity.
Implementation Method 1
detect the light intensity emanating from the narrow side and caused essentially by the display illumination
Data Source
Figure 1
Figure 2
Figure 3a~3b
AI summary
The invention relates to a display device (200, 300, 400, 600) comprising: at least one optical display (202, 302, 402, 602) with a display illumination (206, 306, 606) controllable by a display control (212, 612) with a control signal and a transparent protective screen (208, 308, 408, 608), a light sensor arrangement (238, 638) with at least one light sensor (226, 326, 626, 666) arranged on a narrow side (214, 216, 314, 316, 340, 342, 614, 616) of the transparent protective screen (208, 308, 408, 608), wherein the at least one light sensor (226, 326, 626, 666) is configured to detect the light intensity emanating from the narrow side (214, 216, 314, 316, 340, 342, 614, 616) and caused mainly by the display illumination (206, 306, 606), and an analysis module (236, 636), configured at least to detect damage to the transparent protective screen (208, 308, 408, 608),based on the detected light intensity and the control signal applied to the display illumination (206, 306, 606) during light intensity detection.