Dual Head-Up Display System for Expanding Virtual Image Range
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Solution Overview
Problem
The expansion of the display range in head-up display systems is limited by the need for larger projection units, which can exceed the available space in the console section, making it difficult to accommodate the projection unit.
Innovation Solution
The implementation of a dual head-up display system where two HUDs are installed with intersecting optical center lines and specific angular and distance configurations, allowing for the expansion of the display range without increasing the installation space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the mirror and projection unit are enlarged to expand the display range, then the display range is improved, but the device becomes too large to accommodate in the console section
Solution Approach 1:
The patent divides the projection system into two separate projection units (first projection unit and second projection unit) instead of using one large projection unit. Each projection unit projects a portion of the overall display range, allowing the system to achieve a large total display area while keeping individual projection units compact enough to fit in the console section.
Solution Approach 2:
The patent utilizes the vertical dimension by installing the first and second projection units at different heights and angles. The first projection unit is installed higher and projects downward at an angle, while the second projection unit is installed lower and projects upward at an angle. This three-dimensional arrangement allows both units to contribute to the overall display range without requiring excessive horizontal space in the console section.
2Area of stationary object
If a single large projection unit is used to achieve wide display range, then the display range is improved, but the installation space requirement increases
Solution Approach 1:
The projection system is segmented into two independent projection units, each with its own optical path and projection angle. This segmentation allows the total virtual image display area to be the sum of both projection units' contributions, achieving a wide display range while each unit maintains a compact volume suitable for console installation.
Solution Approach 2:
The patent merges the output of two separate projection units on the windshield to create a unified virtual image display area. The first projection unit projects to a first virtual image area and the second projection unit projects to a second virtual image area, and these areas are positioned to collectively provide the desired wide display range, effectively combining the contributions of both units.
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 enables the expansion of the visual recognition region of virtual images without compromising the accommodability of the head-up display system, allowing for a wider display range while maintaining compact installation.
Implementation Method 1
an optically generated image is projected onto a front windshield through a mirror or the like, and the reflected image light enters the eyes of the driver
Data Source
AI summary
First and second head up displays are installed so an angle ϕ at which a first and second center line intersect is ϕ=θ+α and a distance PD between a first and second virtual emission point, is PD=L(M−L(W−D)/(H−W))/W. The α is α=arctan(W/2L), the θ is an angle of view of first or second virtual emission point, the W is a length of an eye box in a width direction of a vehicle, the L is a distance from an eye point to a virtual image plane, the M is a distance from the eye point to a point where a virtual image cannot be seen, the D is an interval between both eyes, and the H is a length of the virtual image plane on which the virtual image is displayed, in the width direction of the vehicle.