HUD Detection Device with Reflecting Passband for Glare Protection
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Solution Overview
Problem
Current head-up displays (HUDs) face challenges in selectively detecting incident radiation, leading to glare and potential damage from reflections, particularly in vehicles, where tilting the imager is not feasible due to design constraints, and existing solutions either increase production costs or complicate the imaging system.
Innovation Solution
A detection device with an optical element featuring a reflecting area and a passband, where the passband has higher optical transparency than the reflecting area, and a detector is optically coupled to the passband to selectively detect incident radiation, allowing for direction- and angle-selective detection without significantly affecting the imaging system's quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the imager is tilted to deflect incident solar radiation, then glare and overheating are reduced, but the imaging system quality deteriorates
Solution Approach 1:
The optical element is segmented into distinct functional zones: a reflecting area for deflecting harmful radiation and a passband for transmitting imaging light. This segmentation allows the same optical element to perform both radiation deflection and high-quality imaging without compromise.
Solution Approach 2:
Different regions of the optical element have different optical properties. The reflecting area has high reflectivity for solar radiation, while the passband has high transparency for imaging wavelengths. This local differentiation enables simultaneous achievement of radiation protection and imaging quality.
2Measurement precision
If an optical element with passband is introduced to detect incident radiation, then radiation detection and deflection are improved, but device complexity increases
Solution Approach 1:
The optical element serves multiple functions simultaneously: it acts as a beam splitter for radiation detection, a reflector for deflecting harmful radiation, and a transparent window for imaging light transmission. This multi-functionality eliminates the need for separate components, reducing overall system complexity.
Solution Approach 2:
The detection function and radiation deflection function are merged into a single optical element rather than using separate components. The passband enables detection while the reflecting area provides deflection, combining multiple protective and detection functions in one element.
3Manufacturing precision
If the imager operates telecentrically, then manufacturing precision and image quality are improved, but the ability to deflect incident radiation is reduced
Solution Approach 1:
The optical element with passband acts as an intermediary between the telecentric imager and the incident solar radiation. It provides the radiation deflection function that would otherwise be needed for non-telecentric operation, allowing the imager to maintain telecentric operation while still protecting against harmful radiation.
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 effective protection of the imager from glare and overheating by selectively attenuating or deflecting incident radiation, maintaining image quality and reducing production costs, while allowing for telecentric operation of the imager.
Implementation Method 1
an optical element (22) with a reflecting area (A) and a passband (B), wherein an optical transparency of the passband (B) is greater than an optical transparency of the reflecting area (A)
Implementation Method 2
the detector (24) is configured to determine an intensity of a radiation incident on the detector (24)
Data Source
AI summary
Described is a detection device, a head-up display (HUD) and a method for operating a HUD. The detection device, the HUD and the method for operating an HUD are designed to protect an imager of the HUD from damage by incident radiation and to avoid or at least significantly reduce a glare effect of the HUD. The detection device comprises an optical element with a reflecting area and a passband, where the optical transparency of the passband is greater than the optical transparency of the reflecting area. The passband is completely enclosed by the reflecting area, the surface of the passband is smaller than the surface of the reflecting area, and the detection device is optically coupled to the passband. The detection device determines the intensity of a radiation incident on the detection device.