ARHUD Windshield Surface Slope Control for Image Accuracy
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Solution Overview
Problem
Existing windshields with distortions or defects cause positional and distortion issues with augmented reality images, making it difficult to correct positional deviations accurately.
Innovation Solution
A windshield with a defined ARHUD region and specific slope differences (X1 < 0.0008 rad/mm and Y1 < 0.0003 rad/mm) in a lattice pattern, ensuring minimal angular differences between points, and a laminated glass structure with controlled surface slopes to minimize image distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a windshield with arbitrary surface shape is used, then manufacturing is easier, but AR image distortion occurs
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface slope parameters (X1 and Y1) of the windshield glass. By defining specific mathematical expressions for the maximum values of these slope parameters in the ARHUD region, the patent transforms the manufacturing process from arbitrary shaping to precision engineering with controlled parameters, thereby reducing AR image distortion while maintaining manufacturing feasibility
Solution Approach 2:
The patent applies local quality by differentiating the surface slope requirements between the ARHUD region and other regions of the windshield. The ARHUD region has stricter slope control (X1 < 0.0008 rad/mm, Y1 < 0.0003 rad/mm) compared to other regions, ensuring high image quality where needed while allowing more flexibility in other areas for manufacturing ease
2Device complexity
If windshield surface slopes are not controlled, then manufacturing is simpler, but positional deviation of AR image occurs
Solution Approach 1:
The patent introduces specific parameter thresholds (X1 < 0.0008 rad/mm, Y1 < 0.0003 rad/mm) for surface slope control in the ARHUD region. These parameter definitions provide clear manufacturing targets and enable precise measurement and control of surface geometry, directly addressing positional accuracy requirements
Solution Approach 2:
The patent applies preliminary action by establishing surface slope control requirements before the actual AR image projection occurs. By pre-defining and controlling the surface geometry parameters during manufacturing, the patent ensures that the windshield is prepared in advance to minimize positional deviation, rather than attempting correction after image projection
Data Source
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AI summary
Provided is a windshield having an ARHUD region for displaying, superimposed on an outside scene visible from outside a vehicle, a first image that is radiated from a head-up display device with respect to the outside scene, wherein the windshield comprises a plate-shaped glass member having the ARHUD region, and the following expression is satisfied when X1 is defined as the slope difference in the vertical direction in the ARHUD region: X1 < 0.0008 (rad/mm), where a total of m × n points Aij (1 ≤ i ≤ m, 1 ≤ j ≤ n) are defined that are arranged in a lattice with m points in the horizontal direction and n points in the vertical direction, and, when the angle of inclination between a point Aij and a point Ai(j+1) (where 1 ≤ i ≤ m and 1 ≤ j ≤ n - 1) adjacent in the vertical direction on the vehicle-inside surface of the glass member is defined as θAij (rad), X1 is the value obtained by dividing the difference between any θAij and another θAij (excluding those in the same position in the horizontal direction) by the distance between the two points in the vertical direction.