Louvered Blind Lamella Preload for HUD Glare Control and Defect Detection
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Solution Overview
Problem
Conventional head-up displays suffer from stray light reflections that reduce image contrast and are limited by the size of the eyebox, which restricts viewer positioning, and there is a lack of reliable methods to detect defects in anti-reflective components like louvers.
Innovation Solution
A head-up display system with a glare protection element designed as a louvered blind, where the louvers are clamped outside the field of view and connected via a tensioning device to a contacting element, allowing for defect detection through electrical contact loss when a louver is damaged, and using a fiber optic cable to dilate the exit pupil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If visual inspection methods are used to detect defects in louvered blind lamellae, then defect detection capability is provided, but productivity is reduced due to time-consuming manual processes
Solution Approach 1:
The patent replaces manual visual inspection with an automated optical inspection system using cameras and image processing algorithms. The system captures images of the louvered blind lamellae and uses automated defect detection algorithms to identify defects, eliminating the need for time-consuming manual inspection while maintaining or improving detection accuracy.
Solution Approach 2:
The inspection system is integrated directly into the production line, allowing the manufacturing process to self-inspect its own output. The automated system continuously monitors and detects defects without requiring separate manual inspection steps, enabling the process to serve its own quality control needs and improving overall productivity.
2Productivity
If automated optical inspection systems are implemented, then productivity is improved through faster defect detection, but device complexity increases
Solution Approach 1:
The optical inspection system is designed to detect multiple types of defects (surface defects, dimensional deviations, missing components) using a single integrated platform. The system can inspect different types of louvered blind lamellae and adapt to various defect patterns, reducing the need for multiple specialized inspection devices and simplifying the overall system architecture.
Solution Approach 2:
The patent introduces software algorithms and image processing techniques as intermediaries between the optical sensors and the defect detection decision. These computational intermediaries process the raw image data, extract relevant features, and make defect identification decisions, reducing the complexity of the hardware by shifting processing functions to the software domain.
3Manufacturing precision
If comprehensive defect detection is performed on all lamellae, then manufacturing precision is improved, but loss of time increases during the inspection process
Solution Approach 1:
The inspection system operates continuously throughout the manufacturing process, inspecting lamellae as they are produced without interrupting the manufacturing flow. The automated system maintains constant monitoring and detection capability, eliminating the downtime associated with batch-by-batch manual inspection and ensuring continuous quality assurance.
Solution Approach 2:
The system performs preliminary defect detection during the manufacturing process itself, identifying defects early before final assembly or shipping. This preliminary inspection allows for immediate corrective action or sorting, preventing defective products from advancing further in the production chain and reducing rework time later.
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
Reduces stray light influence, maintains image contrast, and ensures a larger eyebox by detecting louver defects without interfering with the beam path, enhancing reliability and safety.
Implementation Method 1
a method for defect detection in louvered blind lamellae (100) comprising: capturing an image of the louvered blind lamellae (100)
Data Source
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AI summary
The present invention relates to a device for generating a virtual image (VB), comprising: - a display element (11) for generating an image; - an optical waveguide (5, 510, 520) for expanding an exit pupil and - an anti-glare element (81) arranged in the beam path downstream of the optical waveguide (5), said anti-glare element being designed as a louvered blind (83) having lamellae (82), wherein - the lamellae (82) are mounted in a preloading arrangement (831) outside the field of view (860) of the device and rest against a contact element (90, 91, 92) under a preload.