Dot Matrix Projector With Split Optical Paths for IR and Visible Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current dot matrix projectors in facial recognition technology have limited functionality and cannot meet the multifunctional requirements of consumer electronic products.
Innovation Solution
A dot matrix projector that emits both infrared light for facial recognition and visible light for other modules or structures, utilizing a collimating lens, total reflection plates, semi-transparent and semi-reflective plates, diffractive optical elements, and infrared light conversion films to achieve bidirectional projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dot matrix projector is designed to emit only infrared light for facial recognition, then the facial recognition function is achieved, but the device has limited functionality and cannot meet multifunctional requirements
Solution Approach 1:
The dot matrix projector is designed to perform multiple functions: it emits infrared light for facial recognition and visible light for other applications such as illumination or display. This multi-functionality is achieved by incorporating both an infrared light source and a visible light source within the same projector structure, allowing a single device to serve multiple purposes and increase adaptability without proportionally increasing complexity
Solution Approach 2:
The patent combines the infrared light source and visible light source into a single integrated projector module. By merging these two light sources and their respective optical paths within one device structure, the system achieves multifunctionality while avoiding the need for separate independent projects, thereby controlling overall device complexity
2Adaptability or versatility
If a dot matrix projector emits light in multiple directions for different functions, then multifunctionality is achieved, but the optical path design becomes more complex
Solution Approach 1:
The optical path is segmented into distinct channels: one for infrared light and one for visible light. Each light source has its own dedicated optical path with appropriate optical elements (collimating lenses, reflecting mirrors, diffractive optical elements) optimized for its specific wavelength and function. This segmentation allows complex multifunctionality to be achieved while managing optical path complexity through modular, independent design of each light channel
Solution Approach 2:
The patent uses a semi-transparent and semi-reflective plate as an intermediary element to manage the interaction between infrared and visible light paths. This plate allows visible light to pass through while reflecting infrared light, or vice versa depending on the configuration, enabling the separation and routing of different light types through a single integrated optical system without requiring completely separate paths
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 projector provides infrared light for facial recognition and visible light for additional applications, enhancing its functionality and meeting market demands for miniaturization.
Implementation Method 1
a collimating lens 20, which receives infrared light from the infrared light source 10 and collimates and converges the infrared light having different directions to be parallel infrared light
Implementation Method 2
a total reflection plate 30, which is on an output side of the collimating lens 20 and totally reflects the parallel light to change a propagation direction of the infrared light
Implementation Method 3
a semi-transparent and semi-reflective plate 50, which divides incident light into two parts and emits the two parts from different directions
Implementation Method 4
a diffractive optical element 40, which diffracts received light to form multiple infrared light spots
Implementation Method 5
an infrared light conversion film 60, which converts incident infrared light into visible light
Data Source
AI summary
A dot matrix projector includes an infrared light source used to emit infrared light, a collimating lens, a semi-transparent and semi-reflective plate on an output side of the collimating lens, a diffractive optical element on an output path of the semi-transparent and semi-reflective plate, and an infrared light conversion film on another output path of the semi-transparent and semi-reflective plate. The collimating lens is used to receive the infrared light from the infrared light source and collimate the infrared light to be parallel infrared light. The semi-transparent and semi-reflective plate is used to divide the parallel infrared light into a first part directly transmitting the semi-transparent and a second part being reflected by the semi-transparent and semi-reflective plate. The infrared light conversion film is configured to convert infrared light into visible light. A facial recognition module and an electronic device are also provided.