Reflective Display Device with Wavelength Selective Surfaces

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Solution Overview

Problem

Existing reflective display devices, such as head-up displays, struggle to vary the distance of virtual images from the driver's viewpoint and display multiple virtual images at different distances effectively, limiting their ability to present information in an optimal and user-friendly manner.

Innovation Solution

A reflective display device with a reflection unit featuring multiple reflecting surfaces of different wavelengths and focal lengths, which selectively reflects light to project virtual images at varying distances, allowing for the display of multiple images at distinct positions relative to the driver's viewpoint.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a single reflector is used in the head-up display, then the device structure is simple, but the ability to display multiple virtual images at different distances is limited

Engineering Contradiction:

Improveability to display multiple virtual images at different distancesVSAvoiddevice structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The reflection unit is divided into multiple reflecting surfaces (first reflecting surface and second reflecting surface) with different focal lengths. Each surface independently reflects light to form virtual images at different distances, enabling the display of multiple virtual images simultaneously without requiring separate reflectors for each function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A single reflection unit performs multiple functions by incorporating reflecting surfaces with different wavelength selectivities and focal lengths. The same reflection unit can display virtual images of different colors at different distances, eliminating the need for multiple separate display systems.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If multiple reflecting surfaces with different focal lengths are used, then virtual images at different distances can be displayed, but the device complexity increases

Engineering Contradiction:

Improvevirtual image distance variationVSAvoidreflection unit structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

Multiple reflecting surfaces with different focal lengths and wavelength selectivities are integrated into a single reflection unit. This merging approach allows the system to achieve multiple virtual image distances and colors while maintaining a compact and unified structural design.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Each reflecting surface within the reflection unit has locally optimized properties (specific focal length and wavelength selectivity) tailored to its function. The first reflecting surface is designed for a specific focal length and wavelength range, while the second reflecting surface has different parameters, allowing each surface to perform its specific function optimally.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If reflecting surfaces with different wavelength selectivities are used, then colored virtual images can be displayed, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvecolor selection capabilityVSAvoidwavelength selectivity precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The wavelength selectivity of each reflecting surface is optimized for specific wavelength ranges corresponding to different colors. By designing each surface with appropriate wavelength selectivity parameters, the system can display colored virtual images while managing manufacturing precision requirements through parameter optimization rather than requiring extreme precision across all surfaces.

Inventive Principle:

Principle #35Parameter changes

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 the precise adjustment of virtual image distances and simultaneous display of multiple images at different positions, enhancing the driver's field of view and information accessibility while minimizing visual obstruction.

Implementation Method 1

a reflection unit that is arranged between the illuminant and the reflector and has a plurality of reflecting surfaces with different wavelength selectivities for selectively reflecting light of a predetermined wavelength

Methodology Applied

Scientific EffectWavelength selective reflection: Reflection

Implementation Method 2

the plurality of reflecting surfaces of the reflection unit has reflecting surface shapes of different focal lengths, and image light of the display image is reflected from each of the plurality of reflecting surfaces and guided to the reflector, which displays the virtual images in different positions

Methodology Applied

Scientific EffectFocal length variation: Focusing

Data Source

PatentUS8867138B2Reflective display device

Publication Date: 2014.10.21 JVC KENWOOD CORP

AI summary

A concave mirror of a reflective display device, which includes a reflector, a concave mirror arranged inside of an instrument panel, a display body, a lighting device, a display control circuit, driving parameters and the like, has reflecting surfaces with different wavelength selectivities, and the reflecting surfaces are formed into reflecting surface shapes of different focal lengths. By image light reflected selectively from the concave mirror, it is possible to present virtual images in different positions to an observer.