Directed Wavelength Emission Component for Display Systems
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Solution Overview
Problem
Current display systems, such as head-mounted devices, face inefficiencies due to the use of broadband light sources that result in unnecessary energy consumption and image artifacts like haze and ghost images, as they project excessive light that is not utilized for image viewing.
Innovation Solution
Incorporating a directed wavelength emission component that filters and selectively emits specific wavelength spectra, using volume Bragg gratings to direct light efficiently and reduce unused light, thereby enhancing energy efficiency and image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a broadband light source is used in a projector to generate displayed images, then the light coverage is sufficient, but a majority of the light projected is unused leading to unnecessary energy consumption and unwanted artifacts in the displayed image
Solution Approach 1:
The patent extracts only the necessary wavelength bands from the broadband light source using spectral filtering components. The filter selectively transmits specific wavelengths required for the display while blocking unnecessary wavelengths, thereby eliminating the source of artifacts and reducing energy consumption by not projecting unused light.
Solution Approach 2:
The patent applies local quality by directing different wavelength bands to different spatial locations or uses. The spectral filter creates localized wavelength selection where only specific wavelength ranges are transmitted in specific directions or to specific display regions, optimizing energy use and eliminating artifacts in targeted areas.
2Illumination intensity
If a broadband light source is used in a projector, then sufficient light coverage is achieved, but image quality deteriorates due to haze and ghost images from excessive unused light
Solution Approach 1:
The spectral filtering component extracts and transmits only the necessary wavelength bands while blocking unnecessary wavelengths. This maintains sufficient illumination intensity for image display while eliminating the excessive light that causes haze and ghost images, thereby improving image quality and reliability.
Solution Approach 2:
The patent changes the spectral parameter of the projected light by using a filter to select specific wavelength bands. This parameter modification maintains adequate brightness for viewing while removing the broadband characteristics that cause image degradation artifacts.
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 approach reduces energy consumption and improves image quality by eliminating unnecessary light, minimizing artifacts and enhancing the field of view while maintaining image clarity and resolution.
Implementation Method 1
using volume Bragg gratings to direct light efficiently
Data Source
AI summary
According to examples, a system for particular emission of wavelength bands using one or more directed wavelength emission components is described. The system may include a wearable eyewear arrangement having a lens assembly. The lens assembly may include a projector to project display light associated with an image and a waveguide for propagating the display light to enable viewing of the image by a user. The projector may include an illumination source component to generate the display light and a directed wavelength emission component coupled to the illumination source component to filter the display light according to one or more filtering characteristics.