Reflective Transparent Screen for Vehicle HUD Brightness Control
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Solution Overview
Problem
Vehicle Head-Up Displays (HUDs) require a narrow viewing angle screen to ensure image visibility only for specific observers, while maintaining high brightness across a wide region, which existing screens fail to achieve effectively.
Innovation Solution
A reflective transparent screen with a first transparent layer having an irregular surface, a reflective layer on top, and a second transparent layer filling the irregularities, where the slant angles in two directions are controlled between -44° and +44° to maximize brightness for observers at specific positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wide viewing angle screen is used, then multiple observers can view the image, but the viewing angle becomes too wide for vehicle HUD applications where only specific observers should view the image
Solution Approach 1:
The patent applies local quality by creating different slant angle regions in different areas of the screen. Specifically, the screen is divided into first and second regions with different slant angle ranges, allowing different viewing characteristics in different zones. This enables the screen to provide narrow viewing angles for specific observer positions while maintaining overall functionality across the screen surface.
Solution Approach 2:
The patent implements dynamics by making the slant angles adjustable or variable across different regions of the screen. The slant angles are not fixed uniformly but can be modified to optimize viewing angles for different observer positions and conditions, allowing the screen to adapt to specific vehicle HUD requirements.
2Ease of operation
If the slant angle range is limited to achieve narrow viewing angle, then observer specificity is improved, but brightness uniformity across the screen may deteriorate
Solution Approach 1:
The patent addresses brightness uniformity through local quality by assigning different slant angle ranges to different regions of the screen. The first region has slant angles in a first range while the second region has slant angles in a second range, allowing each region to be optimized for its specific function while collectively achieving uniform brightness across the entire screen.
Solution Approach 2:
The patent applies parameter changes by systematically varying the slant angle parameter across different screen regions. By changing the slant angle values from one region to another, the patent optimizes both the narrow viewing angle requirement and the brightness uniformity requirement simultaneously.
3Illumination intensity
If microlens arrays with two or more types of microlenses are used, then nonuniformity in intensity is prevented, but device complexity increases
Solution Approach 1:
The patent reduces device complexity by applying local quality in a simplified manner. Instead of using complex microlens arrays with multiple types of microlenses, the patent uses regions with different slant angle ranges, achieving intensity uniformity through a simpler structural differentiation approach.
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 provides a reflective transparent screen with a narrow viewing angle and high brightness across a wide region, ensuring image visibility only for intended observers while maintaining high image quality.
Implementation Method 1
a reflective layer formed on the irregular surface
Implementation Method 2
a second transparent layer formed on the irregular surface on which the reflective layer is formed, so as to fill irregularities
Data Source
AI summary
A reflective transparent screen exhibiting high brightness over a wide region in the screen although with a narrow viewing angle, and an image display system is provided. The reflective transparent screen has a first transparent layer 32 having an irregular surface, a reflective layer 40 formed on the irregular surface, and a second transparent layer 52 formed on the irregular surface on which the reflective layer 40 is formed so as to fill irregularities. The irregular surface of the first transparent layer 32 has a slant angle in a first direction being within a range of from −44′ to +44′, and a slant angle in a second direction perpendicular to the first direction being within a range of from −44′ to +44′.