Multi-Beam Laser Scanner Layout for High-Brightness AR Displays
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Solution Overview
Problem
Existing laser diodes in augmented, virtual, and mixed reality technologies are limited by low image brightness, making it difficult to achieve brightness greater than 12000 nits, and require high power consumption and high system cost.
Innovation Solution
Utilizing multiple red-green-blue (RGB) light generation units to divide the field of view into sections, each assigned to a specific light generation unit, combined with a MEMS-based laser beam scanner, to achieve higher brightness and resolution by scaling transmitted energy proportionally with the number of units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a single laser diode is used to generate images, then the system structure is simple, but the image brightness is limited and cannot exceed 12000 nits
Solution Approach 1:
The patent divides the field of view into multiple sections and assigns each section to a separate light generation unit. Each unit generates light beams for its assigned section, allowing the system to achieve high brightness (greater than 12000 nits) by distributing the imaging task across multiple units rather than relying on a single laser diode.
2Illumination intensity
If multiple light generation units are used to achieve high brightness, then the transmitted energy can be scaled proportionally, but the system cost and complexity increase
Solution Approach 1:
The system is segmented into multiple light generation units, each handling a specific field of view section. This segmentation allows transmitted energy to be scaled proportionally with the number of units, achieving high brightness while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent transitions from a single-point light source to a distributed array of light generation units across multiple dimensions. This dimensional expansion allows the system to scale brightness by adding units in a structured manner, making the complexity increase more manageable and systematic.
3Illumination intensity
If high power is used to achieve high brightness, then the illumination intensity increases, but the power consumption becomes excessive
Solution Approach 1:
Instead of using a single high-power laser diode, the patent segments the power requirement across multiple lower-power light generation units. Each unit operates at moderate power levels, and the cumulative effect achieves the desired high brightness without the excessive power consumption of a single high-power source.
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 high brightness and resolution with a small form factor and low power consumption, fulfilling brightness requirements while maintaining a low system cost.
Implementation Method 1
a scanning system arranged on each of the respective transmission paths of the plurality of RGB light transmitters, the scanning system comprising at least one scanning structure that enables the scanning system to simultaneously steer the respective pixel light beams
Implementation Method 2
a plurality of red-green-blue (RGB) light transmitters configured to synchronously generate respective pixel light beams and transmit the respective pixel light beams
Data Source
AI summary
A picture generation system includes a plurality of red-green-blue (RGB) light transmitters configured to synchronously generate respective pixel light beams and transmit the respective pixel light beams along respective transmission paths to be projected into a full field of view (FOV). The full FOV is divided into a plurality of FOV sections that are respectively paired with a different one of the plurality of RGB light transmitters such that each of the plurality of RGB light transmitters transmits light into a respective area defined by its respective FOV section. The picture generation system further includes a scanning system arranged on each of the respective transmission paths of the plurality of RGB light transmitter. The scanning system includes a scanning structure that enables the scanning system to simultaneously steer the respective pixel light beams into the plurality of FOV sections.