Head-Up Display Sensor Layout for Sunlight Burn Prevention
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Solution Overview
Problem
Head-up display systems are vulnerable to damage from intense sunlight, which can raise the temperature of the image source and potentially cause damage, and existing protection methods have high false alarm rates or affect display quality.
Innovation Solution
A head-up display device with a sensor located near the image generating element to detect excessive light intensity, allowing for early warning and prevention of screen burning, while maintaining image quality by positioning the sensor off the optical path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor is placed near the image source to detect light intensity, then early warning capability is improved, but the risk of sensor damage from intense light increases
Solution Approach 1:
The sensor is extracted from the direct optical path and positioned at the side of the image generating element. This allows the sensor to detect light intensity through a separate detection path rather than being directly exposed to the full intensity of reflected light, reducing damage risk while maintaining detection capability
Solution Approach 2:
The image generating element itself serves as an intermediary for the detection path. External light passes through the image generating element to reach the sensor, allowing the sensor to detect light intensity levels without being directly in the reflected light path where intense concentrated light could cause damage
2Measurement precision
If the sensor is positioned on the optical path to detect light, then detection accuracy is improved, but display quality deteriorates due to obstruction
Solution Approach 1:
The optical system is segmented into a display optical path and a detection optical path. The display path reflects light from the image source to the windshield for the driver, while the detection path allows external light to pass through the image generating element to the sensor. This segmentation allows both functions to operate independently without mutual interference
Solution Approach 2:
The sensor is positioned in a different spatial dimension (at the side of the image generating element) rather than on the main optical path. This dimensional change allows the detection function to operate in parallel with the display function without obstructing the light path from the image source to the windshield
3Reliability
If existing protection methods are used to prevent screen burning, then screen protection is improved, but false alarm rate increases
Solution Approach 1:
The sensor provides continuous feedback on external light intensity levels to the control system. This real-time feedback allows the system to accurately monitor environmental conditions and trigger warnings only when actual dangerous light levels are detected, rather than relying on predetermined thresholds that cause false alarms
Solution Approach 2:
The protection system replaces predetermined mechanical threshold triggers with an active sensing system that continuously measures actual light conditions. This substitution allows the system to adapt to real environmental conditions and distinguish between normal and dangerous light levels, reducing false alarms while maintaining screen protection
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 effectively prevents screen burning by providing early warnings and reducing false alarms, ensuring reliable operation of the head-up display system.
Implementation Method 1
the image generating element is configured to convert the light emitted by the at least one light source into image light and output the image light
Implementation Method 2
the reflective element is configured to receive the image light, and reflect and converge the image light
Implementation Method 3
the image generating element and the at least one sensor are jointly configured such that at least part of light from an outside of the head-up display device and passing through at least partial region of the image generating element is incident on the at least one sensor
Data Source
AI summary
A head-up display device includes a light source component, an image generating element and at least one sensor. The light source component includes at least one light source configured to emit light. The image generating element is configured to convert light emitted by the at least one light source into image light and output the same. The at least one sensor is located at a side of the image generating element close to the light source component. The sensor of the head-up display device has the potential to affect the image light. Also provided are a head-up display system including the head-up display device, and a transport device including the head-up display device or the head-up display system.