HUD Screen Member Grid Array for Outdoor Light Reflection Suppression
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Solution Overview
Problem
Existing head-up display apparatuses reflect outdoor lights onto the virtual display image, compromising display quality due to the configuration of convex and concave lenses, which causes outdoor lights to be irregularly reflected and projected onto the windshield along with the display image.
Innovation Solution
A head-up display apparatus with a screen member featuring a grid array of convex and concave portions, where each portion has a predetermined length along the x and y axes, arranged in a three-dimensional space with orthogonal axes, ensuring that the normal line to the image formation face passes outside the reflection face, preventing outdoor light from being reflected back onto the projection face.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a screen with convex lenses is used to control light diffusion and improve display quality, then the virtual image clarity is improved, but outdoor lights are irregularly reflected and projected onto the windshield, degrading display quality
Solution Approach 1:
The screen surface is segmented into alternating convex portions and concave portions arranged in a grid pattern. This segmentation allows different regions to perform different functions: convex portions control light diffusion for image clarity while concave portions direct reflected light away from the windshield, thereby resolving the contradiction between image quality and outdoor light reflection.
Solution Approach 2:
Different regions of the screen are given different local qualities through the convex-concave alternating pattern. The convex portions have light-diffusing properties optimized for virtual image formation, while the concave portions have light-redirecting properties optimized for preventing outdoor light reflection. This local differentiation allows simultaneous achievement of both improvement goals.
2Manufacturing precision
If the curvature of convex lens surface is made small to improve light control, then the display quality is improved, but the groove curvature becomes significantly large causing normal lines to hit inside the reflection face
Solution Approach 1:
The screen employs asymmetric convex and concave portions with different curvature characteristics. The convex portions have small curvature for precise light diffusion control, while the concave portions have larger curvature designed to redirect light away from the reflection face. This asymmetric design resolves the geometric conflict between light control precision and groove orientation.
Solution Approach 2:
The solution moves from considering only the convex surface geometry to incorporating the concave surface geometry as an additional dimensional element. By designing the concave portions with specific curvature and orientation, the system adds a new geometric dimension that actively redirects problematic light rays, thereby solving the orientation conflict without compromising light diffusion control.
3Object-affected harmful factors
If the screen is oriented to direct normal lines outside the reflection face, then outdoor light reflection is suppressed, but the light diffusion coverage of the viewpoint region may be reduced
Solution Approach 1:
The screen is segmented into functional zones where convex portions handle light diffusion for viewpoint coverage and concave portions handle light redirection for reflection suppression. This segmentation allows the system to simultaneously achieve both objectives without compromising either viewpoint region coverage or outdoor light reflection suppression.
Solution Approach 2:
The concave portions act as intermediary elements between the convex light-diffusing portions and the reflection face. They intercept and redirect light that would otherwise cause reflection issues, thereby mediating between the light diffusion function and the reflection suppression requirement, allowing both to coexist without compromise.
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 effectively suppresses the reflection of outdoor lights onto the virtual display image while enhancing display quality by controlling light diffusion, ensuring that outdoor lights are not projected onto the windshield with the display image, thus improving visibility and clarity.
Implementation Method 1
The convex lenses 132 reflect or refract incident lights that fall on the image formation face, emitting the lights with a predetermined diffusion angle.
Implementation Method 2
The convex lenses 132 reflect or refract incident lights that fall on the image formation face, emitting the lights with a predetermined diffusion angle.
Implementation Method 3
The apparatus includes a screen member and an optical device. The screen member includes an image formation face that forms a display image. The optical device is arranged separate from the screen member and includes a reflection face, which receives and reflects the display image formed by the image formation face
Data Source
AI summary
A head-up display apparatus forms a virtual image of a display image viewed from a viewpoint region by projecting the display image onto a projection face. The apparatus includes a screen member and an optical device. The screen member includes an image formation face that forms the display image. The optical device includes a reflection face, which receives and reflects the display image by the image formation face, to project onto the projection face. The image formation face includes, in a grid array, convex portions and concave portions, which are convex and concave from a virtual reference face and alternated with each other along x axis and y axis. A perpendicular line to the virtual reference face at any position of the image formation face passes through an outside of the reflection face of the optical device.