Protective Screen Damage Detection via Display Edge Light Sensing
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Solution Overview
Problem
Existing display devices with optical displays face issues of vandalism, leading to damage of the transparent protective screen, which impairs data content visibility and user interaction, and existing sensor arrangements are complex, energy-intensive, and unreliable in detecting various types of damage.
Innovation Solution
A display device utilizing the existing display illumination as a sensor light source, with light sensors at the narrow sides of the transparent protective screen to detect light intensity and reflection behavior changes, and an analysis module to evaluate these changes in conjunction with control signals for reliable damage detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent protective screen is arranged in front of the optical display to protect it from vandalism, then the electronic components are protected from damage, but the data content becomes partially or completely unrecognizable when the protective screen is damaged
Solution Approach 1:
The sensor arrangement continuously monitors the protective screen for damage before it affects display functionality. By detecting cracks, stickers, or paint on the protective screen in advance, the system can alert maintenance personnel to replace the screen before it obstructs the display, thus preventing information loss while maintaining component protection
2Reliability
If a sensor arrangement with sensor light source and sensor light receiver arranged along the entire length of narrow sides is used to detect damage, then damage detection capability is improved, but the device complexity and energy consumption increase
Solution Approach 1:
The invention extracts and utilizes the existing display illumination as the sensor light source, eliminating the need for a separate sensor light source arrangement. The display illumination itself serves dual purposes: displaying content and enabling damage detection through the sensor light receiver, thus reducing device complexity while maintaining detection capability
Solution Approach 2:
The display illumination is given a dual function: it serves both as the light source for displaying data content and as the light source for the sensor arrangement to detect damage on the protective screen. This multi-functionality reduces the number of components needed and simplifies the overall system structure
3Reliability
If the sensor light source is arranged along the entire length of the narrow side of the transparent protective screen to detect damage, then the detection coverage is improved, but the energy consumption increases
Solution Approach 1:
The display illumination serves the sensor arrangement's light source needs without requiring additional energy input for a separate sensor light source. The energy already consumed by the display illumination is utilized twice: for displaying content and for enabling damage detection, thus avoiding additional energy consumption while maintaining full detection coverage
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 allows for efficient, reliable detection of various damage types, including stickers and paint, with reduced assembly effort and energy consumption, ensuring continued operation and enabling timely repair of the protective screen.
Implementation Method 1
The at least one light sensor is configured to detect the light intensity emerging at the narrow side and essentially caused by the display illumination
Implementation Method 2
A damaged transparent protective screen 108 can be detected by the evaluation module 192. However, the sensor arrangement of the prior art has some disadvantages. For example, the sensor arrangement has a complex structure with a sensor light source and a sensor light receiver located opposite each other
Data Source
AI summary
A display device includes at least one optical display having a display illumination controllable by a display controller with a control signal and having a transparent protective screen. A light sensor arrangement on the display device has at least one light sensor configured to detect the light intensity emerging at the narrow side of the transparent protective screen and essentially caused by the display illumination. An analysis module is configured to at least detect damage to the transparent protective screen based on the detected light intensity and the control signal applied to the display illumination during the detecting of the light intensity.