Light Guide Microstructure Elements for Angular Visibility Control
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Solution Overview
Problem
Existing display technologies for vehicles are complex and costly, requiring electronic control and energy supply, and struggle to display symbols or information at various locations while ensuring visibility only from specific angles, such as the driver's seat, without being recognizable from other perspectives.
Innovation Solution
A plate-shaped light guide with microstructure elements is used, where the microstructures on the rear surface of the light guide scatter light to create symbols or images only visible within a specific angular range when illuminated, allowing for cost-effective and simple display of information with high contour definition under various lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional display technologies (OLED, electroluminescence) are used to display symbols in vehicles, then the display quality and dynamic content capability are improved, but the device complexity, cost, and power consumption increase significantly
Solution Approach 1:
The patent extracts the display function from complex electronic systems by using passive optical elements (microstructure shapes) that rely on light scattering and refraction rather than active electronic control, thereby eliminating the need for sophisticated electronics while maintaining display capability
Solution Approach 2:
The patent employs simple, inexpensive optical elements (microstructure shapes embedded in transparent material) that can be manufactured at low cost using conventional techniques, replacing expensive OLED or electroluminescence displays for applications where high reliability is not critical
2Adaptability or versatility
If display devices are installed at various locations in vehicles, then the information visibility and accessibility are improved, but the cost and complexity of installation increase
Solution Approach 1:
The patent creates a universal display element (transparent plate with microstructure shapes) that can be installed at multiple locations without requiring location-specific customization, as the same basic structure provides the required display and privacy functions wherever installed
Solution Approach 2:
The display element is designed to be self-contained with no external power supply or electronic control required, allowing independent installation at various locations without complex wiring or power distribution systems
3Reliability
If symbols are made visible from all angles, then the recognition and readability are improved, but the privacy and security are worsened as passengers can also see the symbols
Solution Approach 1:
The patent applies different optical properties to different regions of the display element: the microstructure shapes are positioned and oriented to scatter light specifically toward the driver's viewing angle while maintaining transparency and non-visibility from passenger angles, creating location-specific visibility characteristics
Solution Approach 2:
The microstructure shapes are designed with asymmetric geometries and orientations that preferentially scatter light in specific directions, creating angular-dependent visibility where the symbol is clearly visible from the driver's position but obscured or invisible from other angles
4Object-affected harmful factors
If microstructure shapes are used to limit viewing angles, then the privacy effect is improved, but the contour sharpness and visibility under all lighting conditions may be worsened
Solution Approach 1:
The patent uses curved or rounded microstructure shapes rather than sharp angular features, which helps maintain contour definition while managing light scattering patterns to achieve the desired angular visibility control
Solution Approach 2:
The patent optimizes parameters such as the size, shape, spacing, and orientation of microstructure features to balance privacy effectiveness with symbol visibility and contour sharpness, adjusting these parameters based on the specific application requirements
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 the temporary display of symbols and information at desired positions with limited angular visibility, maintaining clarity and recognition from all relevant angles, without the need for complex electronic control or energy supply, thus addressing the complexity and cost issues of existing solutions.
Implementation Method 1
a plurality of microstructure shapes and/or microstructure elements are incorporated into a surface in a rear area of the light guide... which together cause light scattering towards a viewing side of the light guide
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a display substrate (1) designed as a plate-shaped light guide made of an at least partially transparent light-guiding material, wherein the plate-shaped light guide has a light coupling section (10) and a surface designed as a viewing area (20) for displaying a specific symbol, image element and/or a message (S), wherein for this purpose a plurality of microstructure forms (30) are incorporated into the surface in the rear area (25) of the light guide in a region (25) opposite the viewing area (20), each of which is provided in a predetermined geometric size, shape and arrangement, so that when viewing the viewing area (20), depending on whether the plate-shaped light guide is illuminated by means of a light source (40) via the light coupling section (10) or not, the viewing area (20) is viewed at least within a certain angular range α relative to the perpendicular (L) of the surface.the symbol, image element or note (S) is displayed or not.