Mobile Terminal Lighting Device Diffractive Optical Element Depth Extraction
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Solution Overview
Problem
Current mobile terminals face challenges in efficiently extracting depth information from images using lighting devices, as they require a large number of light sources to achieve optimal performance, leading to increased costs and terminal size.
Innovation Solution
A mobile terminal with a lighting device that includes a plurality of light emitting devices and a diffractive optical element (DOE) to diffract light, increasing the number of optical spots per unit area without duplicating light sources, allowing for a smaller number of light sources and reduced terminal size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of light sources are used to extract depth information, then the depth extraction performance is improved, but the terminal size and cost increase
Solution Approach 1:
The patent divides a single light source into multiple optical spots by using a diffractive optical element. Each light source is segmented into multiple beams that are diffracted at different angles, creating multiple optical spots on the subject. This allows the system to achieve the functionality of multiple light sources using a single physical light source, thereby reducing terminal size while maintaining depth extraction performance.
Solution Approach 2:
The diffractive optical element acts as an intermediary between the light source and the subject. It receives light from the light source and transforms it into multiple diffracted beams by introducing a phase structure. This intermediary component enables a single light source to produce multiple optical spots, resolving the contradiction between needing multiple light sources for good depth extraction and wanting to keep the terminal compact.
2Measurement precision
If a large number of light sources are used to extract depth information, then the depth extraction performance is improved, but the manufacturing cost increases
Solution Approach 1:
The patent segments the light from a single light source into multiple optical spots using a diffractive optical element. This eliminates the need to manufacture and assemble multiple separate light sources, reducing component count and manufacturing complexity. The single light source combined with the DOE is more cost-effective than multiple light sources while achieving the same depth extraction capability.
Solution Approach 2:
The diffractive optical element creates optical copies (spots) of the light from a single source. Instead of physically replicating multiple light sources, the system uses the DOE to generate multiple optical spots that replicate the lighting pattern. This optical copying approach reduces manufacturing cost by replacing multiple physical light sources with a single light source and a passive optical element.
3Quantity of substance
If a diffractive optical element is used to increase optical spots, then the number of optical spots per unit area increases, but light intensity may be reduced
Solution Approach 1:
The diffractive optical element is designed with specific local structures (grooves or patterns) at different positions and orientations. Each local region of the DOE is optimized to diffract light in a specific direction, creating optical spots at predetermined locations. This local quality design ensures that light intensity is distributed effectively across multiple spots while maintaining sufficient brightness for depth extraction.
Solution Approach 2:
The patent changes the optical parameters of the system by introducing a diffractive optical element with specific groove densities, depths, and patterns. By adjusting these parameters, the system controls the distribution of light intensity across the generated optical spots. The DOE is designed to maintain adequate intensity at each spot while maximizing the number of spots per unit area, balancing quantity and quality of light distribution.
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 enables a higher density of optical spots per unit area, reducing costs and terminal size while maintaining effective depth information extraction, by diffracting light into multiple beams using a DOE, thus increasing the number of optical spots irradiated without the need for multiple light sources.
Implementation Method 1
a diffractive optical element (DOE) to diffract a part of light output from each of the plurality of light emitting devices
Data Source
AI summary
The present invention relates to a mobile terminal comprising a lighting device. The lighting device according to one embodiment of the present invention comprises multiple light-emitting elements and a diffractive optical element (DOE) for diffracting a part of the light which has been output from each of the multiple light-emitting elements, wherein the light, which has been output from the multiple light-emitting elements and has passed through the diffractive optical element, comprises multiple first kinds of light not diffracted by the diffractive optical element and multiple second kinds of light diffracted by the diffractive optical element, and the diffractive optical element diffracts the part of the light output from the multiple light-emitting elements such that at least some of the multiple second kinds of light is radiated into an area formed by connecting the multiple first kinds of light.