Vehicle HUD Flocking on Trim Surfaces to Reduce Reflections
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Solution Overview
Problem
Conventional methods for reducing light reflection from structural surfaces in Head-Up Display (HUD) apparatuses, such as painting or using black tape/velvet, are time-intensive, costly, and less effective, especially on compound curved surfaces.
Innovation Solution
Applying flocking to the interior structures of a vehicle, including support structures around the optical elements of a HUD apparatus, using a method that involves applying an attractant and deploying flocking from a disbursement device, ensuring a uniform and continuous coverage without a backing layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional painting or black tape/velvet materials are used to reduce light reflection, then light absorption is improved, but the process becomes time-intensive and costly
Solution Approach 1:
The patent replaces conventional mechanical application methods (painting, taping, gluing) with an electrostatic field-based application system. The flocking material is charged and attracted to the target surface through electrostatic forces, enabling rapid, uniform coating without manual labor-intensive processes. This substitution of physical application mechanisms with electromagnetic field control directly resolves the time-intensive nature of conventional methods while maintaining effective light absorption.
Solution Approach 2:
The patent changes the physical state and properties of the flocking material by charging it electrostatically before application. This parameter change (from neutral to charged state) enables the material to be suspended in air and precisely directed to the target surface, transforming the application process from a slow, contact-based method to a rapid, field-based deposition process that reduces application time significantly.
2Object-affected harmful factors
If conventional painting or black tape/velvet materials are used to reduce light reflection, then light absorption is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent replaces complex multi-step mechanical manufacturing processes (surface preparation, painting, taping, trimming) with a simplified electrostatic field-based application system. The charged flocking material automatically conforms to complex geometries and compound curved surfaces without requiring manual intervention for each surface variation, thereby reducing manufacturing process complexity while achieving the same light absorption function.
Solution Approach 2:
The electrostatic field-based application system serves multiple functions simultaneously: it applies the light-absorbing material, ensures uniform distribution, adapts to complex geometries, and eliminates the need for backing layers or additional trimming steps. This multi-functionality consolidates what would otherwise be multiple separate manufacturing operations into a single process, reducing overall manufacturing complexity.
3Object-affected harmful factors
If black tape or velvet materials with backing layer are used, then light absorption is improved, but application to compound curved surfaces becomes difficult causing bunching, tearing, or separating
Solution Approach 1:
The patent replaces mechanical adhesion methods (backing layers, adhesives, taping) with electrostatic field-based attraction. The charged flocking material is drawn to and held on the target surface by electrostatic forces, eliminating the need for flexible backing layers that must physically conform to compound curved surfaces. This substitution removes the source of bunching, tearing, and separating problems while maintaining effective light absorption.
Solution Approach 2:
The patent changes the attachment mechanism from mechanical (physical contact and adhesion through backing layers) to electromagnetic (electrostatic attraction). This parameter change allows the flocking material to conform to any surface geometry without physical deformation, as the electrostatic field can be applied uniformly across compound curved surfaces, enabling easy application without bunching, tearing, or separating.
4Object-affected harmful factors
If conventional materials are used to cover structural surfaces, then light reflection is reduced, but the process is costly and less effective
Solution Approach 1:
The patent replaces expensive conventional materials (black velvet, specialty tapes, multiple coats of paint) with a cost-effective charged flocking material that can be applied in a single layer. The electrostatic field-based application system uses minimal material to achieve uniform coverage, reducing material costs while maintaining or improving light reflection reduction effectiveness compared to conventional thick or multi-layer applications.
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 flocking method effectively absorbs light, reducing reflections and ghost images on the windshield, while being more efficient and cost-effective than traditional methods, and suitable for complex curved surfaces.
Implementation Method 1
applying adhesive or electric charge or magnetic charge to the trim surface
Implementation Method 2
applying adhesive or electric charge or magnetic charge to the trim surface
Implementation Method 3
applying adhesive or electric charge or magnetic charge to the trim surface
Implementation Method 4
entraining the flocking into a flow of air, and directing the flow of air towards the interior structure
Implementation Method 5
entraining the flocking into a flow of air
Implementation Method 6
The flocking can be directly in contact with the attractant, and the attractant can be directly in contact with the trim structure... effectively absorbs light, reducing reflections
Data Source
AI summary
Methods of flocking and various embodiments of head-up displays for a vehicle are contemplated. Some embodiments of a head-up display unit can include a display unit configured to display an image onto an observation surface of a vehicle and trim structure located about a periphery of the display unit. The trim structure can have an exterior surface configured to be exposed to an interior compartment of the vehicle. A substantially uniform and continuous adhesive layer can be located directly on and in contact with an entire extent of the exterior surface. Flocking can be applied by an air gun such that flocking is dispersed directly on and in contact with the adhesive layer and such that no backing layer exists between the flocking and the exterior surface. Some embodiments of the methods of flocking can include spraying an adhesive and spraying flocking onto trim for a head-up display device.