HUD Display Device Correcting Virtual Image Defects
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Solution Overview
Problem
Existing display devices for head-up displays (HUDs) face defects such as tilt, distortion, and horizontal-angle deviation due to manufacturing and assembly errors, as well as variations in the driver's viewing location, leading to increased workload, size, and costs in correction methods.
Innovation Solution
A display device configuration that includes a light source unit, a scan mirror, and a concave mirror, with a correction unit that adjusts the intermediate image to compensate for defects by rotating or moving the image within the screen, using a control unit to generate control signals for the light source and scan mirror, and storing correction information to adapt to different usage situations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to correct virtual image defects, then image quality is improved, but workload, apparatus size, and costs increase
Solution Approach 1:
The patent replaces complex mechanical correction systems with a computational approach. The control unit calculates corrected scan signals based on stored correction information, substituting physical adjustment mechanisms with software-based image processing to correct defects while maintaining simple hardware architecture
Solution Approach 2:
The patent applies preliminary correction by storing correction information in advance that compensates for known defects. The correction data is prepared beforehand and applied during operation, allowing the system to pre-compensate for manufacturing errors, assembly variations, and viewing location differences without requiring real-time complex adjustments
2Measurement precision
If correction methods are implemented to address manufacturing and assembly errors, then virtual image accuracy is improved, but device complexity and costs increase
Solution Approach 1:
The patent creates a virtual copy of the correction process through computational methods. Instead of physically adjusting components to correct errors, the system generates corrected scan signals that replicate the effect of perfect alignment, allowing accurate virtual image display without modifying the physical hardware configuration
Solution Approach 2:
The patent changes the parameters of the scan signals rather than the physical components. By adjusting the temporal and spatial parameters of the driving signals to the scan mirrors, the system compensates for manufacturing and assembly errors, achieving high accuracy through signal modification rather than hardware complexity
3Manufacturing precision
If multiple correction mechanisms are added to handle various error factors, then image quality is improved, but workload and apparatus size increase
Solution Approach 1:
The patent implements a universal correction approach where a single control unit handles multiple types of defects simultaneously. The correction information stored in the storage unit addresses manufacturing errors, assembly variations, and viewing location differences all through one integrated system, eliminating the need for separate correction mechanisms for each error type
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 easy correction of virtual image defects without increasing workload, size, or costs, improving image quality by effectively addressing tilt, distortion, and horizontal-angle deviations caused by various factors.
Implementation Method 1
a scan mirror (12) that scans light flux emitted from the light source unit (11)
Implementation Method 2
a concave mirror (14) that reflects light flux emitted from the screen (13) toward the transmission/reflection member (15)
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A display device (1) includes an intermediate-image formation unit (515) configured to form an intermediate image (21) on a screen (13), a projection unit (516) configured to project the intermediate image (21) toward a transmission/reflection member (15) to display a virtual image (25), a reception unit (503) configured to receive virtual image information about the virtual image (25), and a correction unit (512) configured to rotate the intermediate image (21) within the screen (13) to correct a defect of the virtual image (25) in accordance with the virtual image information.