Vehicle Display Device Using Segmented Laser Image Generators
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Solution Overview
Problem
Conventional vehicle display devices face challenges in accurately projecting images at appropriate positions without enlarging the mirror's scanning range, leading to potential resolution reduction and unwanted light issues.
Innovation Solution
A vehicle display device featuring a dual-image generator system with separate MEMS mirrors and a switching unit, using laser light to project images onto distinct regions of the windshield, with a magnifier to enhance image visibility and prevent 'black brightening', allowing for precise positioning without excessive mirror oscillation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single mirror oscillates with turning movements to project images at different positions, then the mirror can cover multiple display regions, but the scanning range becomes too large leading to resolution reduction
Solution Approach 1:
The patent divides the display system into multiple independent image generators (first image generator for first region, second image generator for second region), each with its own mirror. This segmentation allows each mirror to operate within a smaller, more precise scanning range while collectively covering multiple display regions, thereby resolving the contradiction between display flexibility and projection precision.
2Ease of operation
If the mirror scans a large range to project images at appropriate positions, then different images can be displayed at different positions, but the oscillation range increases causing resolution loss
Solution Approach 1:
The patent segments the display functionality into multiple dedicated image generators, each responsible for a specific display region. This allows each mirror to oscillate within a limited range optimized for its designated region, maintaining high image resolution while achieving versatile image positioning through the coordinated operation of multiple generators.
3Device complexity
If one mirror is used to project images at multiple positions, then the device structure remains simple, but the mirror oscillation range enlarges causing unwanted light issues
Solution Approach 1:
The patent employs multiple mirrors, each dedicated to a specific image generator and display region. This segmentation confines the oscillation range of each mirror, preventing them from scanning across the entire display area and thereby reducing the generation of unwanted light. Although this increases device complexity compared to a single-mirror system, it effectively eliminates the harmful light effect.
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
Enables accurate and clear image projection at appropriate positions without enlarging the mirror's scanning range, reducing resolution loss and minimizing unwanted light, thus improving visibility and reducing heat generation in the MEMS mirrors.
Implementation Method 1
a light source that emits laser light
Implementation Method 2
a mirror that projects an image onto a screen by reflecting laser light incoming from the light source toward the screen
Implementation Method 3
a magnifier provided between a reflection section located in front of an eye point set in a vehicle and the screen, the magnifier being configured to project an image onto the screen while magnifying the image
Data Source
AI summary
A vehicle display device includes an image generator including a light source that emits laser light and a mirror that projects an image onto a screen by reflecting laser light incoming from the light source toward the screen while oscillating with turning movements about two rotation axes perpendicular to each other and a magnifier provided between a reflection section located in front of an eye point set in a vehicle and the screen, and configured to project an image onto the screen while magnifying the image. The image generator includes a first image generator configured to generate an image to be projected onto a first region and a second image generator configured to generate an image to be projected onto a second region. The first region overlaps with a view ahead of the vehicle as viewed from the eye point. The second region is located around the first region.