Scanning Projector Transmissive Screen with Integrated Lens
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Solution Overview
Problem
In vehicle head-up displays using scanning projectors, the limited installation space within the dashboard poses a challenge in maintaining image clarity without increasing the number of components, as existing solutions require additional lenses to correct brightness inhomogeneity at the edges of the transmissive screen.
Innovation Solution
A transmissive screen with a microlens array on one surface and a single lens, either convex, Fresnel, or concave, on the other surface, which diffuses light inward at the edges, eliminating the need for a separate field lens and reducing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a field lens is positioned near the transmissive screen to correct brightness inhomogeneity, then image clarity is improved, but the number of components increases
Solution Approach 1:
The patent combines the field lens function with the transmissive screen by forming a single lens directly on the emission surface of the screen. This integration merges two separate components (transmissive screen and field lens) into one unified structure, eliminating the need for a separate field lens while maintaining the brightness correction function. The single lens is formed as an integral part of the transmissive screen, thereby reducing component count and simplifying the overall device structure.
Solution Approach 2:
The transmissive screen is designed to perform multiple functions simultaneously: it serves as both the light diffusing element (with microlens arrays on the incident surface) and the field lens (with the single lens on the emission surface). This multi-functionality allows the single component to replace what would traditionally require multiple separate components, addressing the contradiction between image quality and device complexity.
2Manufacturing precision
If additional lenses are added to correct brightness distribution, then image uniformity is improved, but installation space requirements increase
Solution Approach 1:
By integrating the field lens function into the transmissive screen itself, the patent eliminates the need for additional space that would be required to accommodate a separate field lens. The merged structure maintains all necessary optical functions within the existing footprint of the transmissive screen, thereby correcting brightness uniformity without increasing installation space requirements.
3Volume of moving object
If the number of components is reduced to save space, then device compactness is improved, but image clarity may deteriorate
Solution Approach 1:
The transmissive screen is designed to perform multiple optical functions simultaneously through its dual-surface lens structure. The incident surface microlens arrays handle light diffusion and viewing angle expansion, while the emission surface single lens handles brightness uniformity correction. This multi-functional design allows the device to maintain image clarity with fewer components, achieving compactness without sacrificing optical performance.
Solution Approach 2:
The patent merges the functions of light diffusion and brightness correction into a single integrated transmissive screen component. This consolidation maintains the optical performance that would traditionally require multiple separate components, thereby achieving device compactness while preserving image clarity.
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
This configuration ensures clear images are projected across the entire field of view without additional components, providing a space-saving and cost-effective solution for in-vehicle head-up displays.
Implementation Method 1
Light that has emitted from the scanning projector and then entered to the transmissive screen for the scanning projector is diffused inside the transmissive screen in a traveling direction corresponding to an incident angle due to the microlens arrays formed on an incident surface
Implementation Method 2
The traveling direction of the diffused light is changed to more inward as it gets closer to the end portion by a function of a single lens formed on an emission surface
Data Source
AI summary
There is provided a scanning projector transmissive screen having a first surface on which a microlens array is formed, and a second surface formed into a single lens shape.