Light Guide Microstructures for Angular-Selective Symbol Display
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Solution Overview
Problem
Existing display technologies for vehicles are complex, costly, and inefficient for temporarily displaying symbols or information at various locations with limited angular visibility, as they require expensive and energy-consuming solutions, and existing methods for controlling light direction are too complex for simple information display.
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
1Adaptability or versatility
If conventional display technologies (OLED, electroluminescence) are used to display symbols dynamically, then the display can show variable content, but the device becomes complex, expensive, and energy-consuming
Solution Approach 1:
The display surface is segmented into multiple microstructure elements (microlens arrays, microprisms, or microreflex elements) that are independently controllable. Each microelement can be individually activated or deactivated to form different symbols or patterns, enabling dynamic content display without requiring a complete display system. This segmentation allows simple binary display (on/off states) while creating complex visual patterns.
Solution Approach 2:
The patent replaces complex electronic display systems (OLEDs, electroluminescence devices) with a passive optical system. Instead of using electroluminescent materials that require power and complex control circuits, the invention uses light-guiding plates with microstructures that redirect ambient or reflected light to create visible symbols. This substitution eliminates the need for power supply, electronic control, and complex display hardware.
2Adaptability or versatility
If complex displays with electronic control and power supply are attached to display symbols in vehicle applications, then the display can show information, but the attachment becomes costly and complex
Solution Approach 1:
The display system is designed to be self-illuminating by utilizing ambient light or light reflected from the vehicle interior. The light-guiding plate with microstructure elements redirects this available light to create visible symbols without requiring an external power supply or active lighting system. The display serves itself by harnessing existing light sources in the vehicle environment.
Solution Approach 2:
The invention uses passive, low-cost optical elements (light-guiding plates with microstructures) instead of expensive, complex electronic display components. The display can be implemented using inexpensive materials and simple manufacturing processes, making it suitable for temporary or disposable applications in vehicle interiors where permanent, high-cost displays are not justified.
3Manufacturing precision
If light is scattered to create symbols with high contour definition, then the symbol visibility is improved, but the angular range for viewing may be limited
Solution Approach 1:
The light-guiding plate incorporates microstructure elements with different optical properties at different locations. The microprisms or microreflex elements are positioned and oriented to scatter light at specific angles, while other regions may have different microstructure configurations optimized for their local viewing requirements. This local optimization allows high contour definition at the symbol location while maintaining acceptable viewing angles through strategic placement of light-scattering elements.
Solution Approach 2:
The patent employs curved or angled microstructure elements (such as tilted microprisms or hemispherical microlens arrays) that can redirect light over a broader angular range. The curvature and orientation of these microelements are designed to scatter light in multiple directions simultaneously, maintaining symbol clarity while expanding the viewing cone. The angled facets of microprisms, for example, can reflect light at various angles depending on the incident light direction.
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 visibility across different viewer angles and lighting conditions without the need for complex or expensive setups.
Implementation Method 1
a large number of microstructure shapes and/or microstructural elements are introduced into the surface in the rear region of the light guide, which are each provided in a predetermined geometric size, shape and arrangement, so that when viewing the visible surface... the correspondingly generated symbol, picture element or cue (S) is displayed
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.