Head-Up Display Light Guide Plate Deflector Bird's-Eye View
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Solution Overview
Problem
Existing display devices for presenting stereoscopic images can cause observers to perceive unintended images depending on their viewing direction, particularly when looking up or down, which can lead to confusion in interpreting the displayed information.
Innovation Solution
A head-up display device utilizing a light guide plate and a plurality of deflectors that guide and deflect light to form images in a space outside the device, allowing observers to view objects from above, with the deflectors configured to converge light onto specific points or lines, creating a three-dimensional image that appears as if viewed from directly above, thereby reducing unintended perceptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display device presents a two-dimensional image stereoscopically using a microlens array, then the image can be viewed in three dimensions, but the observer may perceive unintended images depending on whether the observer looks up or looks down to see the image
Solution Approach 1:
The patent transforms the conventional two-dimensional display into a three-dimensional virtual image space by using a light guide plate with deflectors that project light at different angles. This creates a virtual image that appears to float in space above the display surface, allowing observers to perceive a consistent bird's-eye view regardless of their viewing angle, thus eliminating the problem of perceiving unintended images when looking up or down.
2Reliability
If the display device forms an image in a space outside the device, then observers can view the object from above with reduced unintended perceptions, but the device complexity increases due to the light guide plate and deflector configuration
Solution Approach 1:
The patent integrates the light guide plate and deflectors into a unified optical system where the deflectors are embedded within or coupled to the light guide plate. This merging of components creates a compact structure that forms virtual images in external space while maintaining ease of manufacture and assembly, thereby reducing the practical complexity despite the advanced optical functionality.
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
The solution effectively presents clear, bird's-eye view images to observers, reducing the likelihood of perceiving unintended views and improving the clarity of route guidance or object recognition, even when viewed from below the display device.
Implementation Method 1
a light guide plate configured to guide light within a plane parallel to an emission surface
Implementation Method 2
Each deflector in the plurality of deflectors may include one or a plurality of groups of deflection surfaces inclined relative to the emission surface on the outer surface or on the inside of the light guide plate and configured to reflect, refract, or diffract light guided thereto by the light guide plate
Implementation Method 3
Each deflector in the plurality of deflectors may include one or a plurality of groups of deflection surfaces inclined relative to the emission surface on the outer surface or on the inside of the light guide plate and configured to reflect, refract, or diffract light guided thereto by the light guide plate
Implementation Method 4
Each deflector in the plurality of deflectors may include one or a plurality of groups of deflection surfaces inclined relative to the emission surface on the outer surface or on the inside of the light guide plate and configured to reflect, refract, or diffract light guided thereto by the light guide plate
Data Source
AI summary
A display device for head-up display forms an image with a view of an object from above in a vertical direction in a space outside the display device for an image which presents an object with a vertical direction. The object includes a reference surface that is a reference of the vertical direction. The display device forms the image so that an observer has a view from the upper part of the reference surface.