Louvre Light Control Layer for HUD Sunlight Glare
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Solution Overview
Problem
Display systems, particularly automotive head-up displays, suffer from sunlight glare due to reflective components that reflect sunlight onto the viewing window, causing discomfort and reducing image quality.
Innovation Solution
A light control layer with a louvre structure comprising an array of louvres with specific overlap, orientation, and material properties is integrated into the optical component to absorb or attenuate sunlight while allowing image light to pass through, minimizing glare and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a reflective surface is used in the optical component, then the image quality and holographic projection are improved, but sunlight glare is generated that reaches the viewing window
Solution Approach 1:
A light control layer is introduced as an intermediary component between the reflective surface and the incoming sunlight. This layer contains a louvre structure that selectively blocks sunlight while allowing image light to pass through, thus mediating between the harmful sunlight and the useful image projection without eliminating the reflective surface
Solution Approach 2:
The light control layer is segmented into multiple individual louvres arranged in an array. Each louvre acts as an independent light-blocking element, and their collective arrangement creates a pattern that selectively filters sunlight angles while maintaining image light transmission paths
2Object-affected harmful factors
If a light control layer with louvre structure is added to block sunlight, then sunlight glare is reduced, but the device complexity increases
Solution Approach 1:
The sunlight-blocking function is extracted from the main optical component and implemented as a separate light control layer with louvre structure. This allows the reflective surface to maintain its image-projection function while the extracted light-control function handles sunlight rejection, reducing overall system complexity through functional separation
Solution Approach 2:
The light control layer is implemented as a thin film or coating structure rather than a bulky mechanical component. The louvres are formed as surface features or embedded elements within a thin layer, minimizing the added thickness and structural complexity while achieving effective sunlight blocking
3Object-affected harmful factors
If the louvres are made with high absorption material to block sunlight, then sunlight glare is reduced, but the image light transmission may be affected
Solution Approach 1:
The louvre structure creates different local optical properties: the louvre surfaces themselves have high absorption properties to block sunlight, while the spaces between louvres and the overall structure maintain high transmission properties for image light. This local differentiation of optical qualities allows simultaneous sunlight blocking and image light transmission
Solution Approach 2:
The louvre structure is designed with asymmetric geometry where the louvre width, spacing, and orientation are specifically tailored to match the angular distribution of sunlight versus image light. The asymmetric arrangement blocks high-angle sunlight while preserving low-angle image light paths, optimizing both glare reduction and image transmission
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 effectively reduces sunlight glare while preserving the quality of holographic projections by absorbing or diffusing sunlight, ensuring clear and undistorted image transmission.
Implementation Method 1
The louvres are formed from a material having one or more of: high absorption; high attenuation; low specular reflectivity, and high diffusivity of light
Implementation Method 2
A pitch between adjacent louvres of the louvre structure is such that the distal end/edge of one louvre overlaps the proximal end/edge of the adjacent louvre
Implementation Method 3
The louvres are formed from a material having one or more of: high absorption; high attenuation; low specular reflectivity, and high diffusivity of light
Implementation Method 4
The louvres are formed from a material having one or more of: high absorption; high attenuation; low specular reflectivity, and high diffusivity of light
Data Source
AI summary
A display system and light control layer is described. The display system includes an optical component having a reflective surface. A light control layer is disposed on a first surface of the optical component on an optical path of sunlight to the reflective surface. The light control layer includes a louvre structure including an array of louvres. Each louvre is arranged at an orientation angle relative to the first surface. The separation between adjacent/neighbouring louvres is such that the distal end/edge of one louvre overlaps the proximal end/edge of the adjacent/neighbouring louvre.