VCSEL Array Laser Beam Combining for Digital Data
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Solution Overview
Problem
Current laser-based display technologies are inefficient, bulky, and produce dim or non-scalable results due to reliance on mechanical mirrors and analog power sources, with limited color depth and saturation, and are hindered by scintillation effects and high energy consumption.
Innovation Solution
The use of vertically-emitting semiconductor laser (VCSEL) arrays with binary string control to generate highly resolved intensity profiles, reducing scintillation and energy usage by combining wavelengths to form colors, and integrating laser devices with drive electronics in flip chip packaging for compact, efficient displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If mechanical mirrors and analog power sources are used in laser-based display technologies, then color generation is achieved, but the system becomes bulky, inefficient, and produces dim results with limited color depth
Solution Approach 1:
The patent segments the laser light source into multiple discrete wavelengths (red, green, blue lasers) that can be independently controlled. Each wavelength is generated by a separate laser diode, allowing precise digital control of intensity for each color component, thereby achieving bright and scalable color generation without bulky mechanical mirrors
Solution Approach 2:
The patent replaces mechanical mirror systems with a digital control system that directly modulates the intensity of multiple laser wavelengths. Instead of using mechanical scanners to generate colors, the system uses digital signals to control the power of each laser, eliminating mechanical components and reducing system size while improving efficiency
2Manufacturing precision
If edge-emitting semiconductor laser devices are used to produce correct color sources, then color accuracy is achieved, but the devices cannot be photo-lithographically arrayed and require mechanical cleaving
Solution Approach 1:
The patent inverts the conventional approach by using vertical-cavity surface-emitting lasers (VCSELs) that emit light perpendicular to the substrate surface, rather than edge-emitting lasers that require edge cleaving. This inversion allows the lasers to be fabricated using standard photo-lithographic processes on semiconductor wafers, enabling precise color accuracy through controlled epitaxial growth while simplifying manufacturing
Solution Approach 2:
The patent changes the emission geometry parameter from edge-emitting to surface-emitting configuration. By altering the laser cavity orientation to be vertical rather than lateral, the devices can be manufactured using photo-lithography with precise control over emission wavelength and color properties, eliminating the need for mechanical cleaving while maintaining color accuracy
3Adaptability or versatility
If VCSELs are used to produce green and other color outputs, then color generation capability is improved, but power requirements are extreme and reliability issues arise
Solution Approach 1:
The patent merges multiple VCSEL devices with different wavelength capabilities (red, green, blue) into a single integrated array. By combining the outputs of these lasers through optical coupling, the system achieves full-color generation capability while distributing the power and reliability demands across multiple devices rather than relying on a single high-power VCSEL
Solution Approach 2:
The patent creates a universal laser array system where VCSELs can generate multiple colors (red, green, blue) through a single fabricated device structure. The same VCSEL array architecture supports different wavelength emissions, providing multi-functionality that reduces reliability concerns by avoiding the need for extreme power operation in any single color channel
4Illumination intensity
If DLP technology with mechanical mirrors is used to determine color intensity, then color control is achieved, but the system is heavily dependent on mechanical components and generates excessive heat
Solution Approach 1:
The patent substitutes mechanical mirror systems with direct digital intensity modulation of laser diodes. Each laser's output intensity is controlled by digital signals that adjust the injection current, eliminating the need for mechanical scanning mirrors and their associated heat generation from absorbed light
Solution Approach 2:
The patent uses pulsed or modulated laser operation where each laser wavelength is activated in controlled intervals to generate the required color intensity. This periodic action allows efficient energy utilization and reduces continuous power consumption and heat generation compared to continuously operating mechanical mirror systems
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 enables brighter, scalable, and more efficient color generation with reduced size and weight, minimizing scintillation and energy consumption, while allowing for flexible array configurations and improved thermal management.
Implementation Method 1
a lens array positioned over the set of semiconductor light devices and configured to focus the plurality of light beams to a single focal point
Implementation Method 2
a macro lens positioned beyond the lens array and configured to collimate the plurality of light beams into the single light beam carrying the digital data
Data Source
AI summary
Embodiments comprise laser emitter devices that generate a collimated beam of light the intensity or amplitude of which may be varied so as to carry data signals at a high rate of efficiency, and that is less sensitive to alignment of the detector, and detector systems for detecting the same collimated beam and reading the data carried in the beam of light.