Head-Mounted Projector Linear LED Array Thermal Management
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Solution Overview
Problem
Existing micro-displays in portable devices, such as head-mounted devices, face challenges with high luminosity requirements leading to heat dissipation issues and size constraints, making it difficult to integrate them into lenses for augmented reality applications.
Innovation Solution
A projector with a linear array of light sources and a scanning mechanism that moves the light beam to display images, reducing the projector's size and heat dissipation, and allowing for integration into portable devices like mobile phones or head-mounted devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a micro-display with high luminosity is used in a portable device, then the readability in high luminance environments is improved, but the temperature of the display elements increases causing heat dissipation problems and user discomfort
Solution Approach 1:
The patent employs sequential color display technology where a single LED source alternates between emitting red, green, and blue light in rapid succession. This periodic activation of the light source reduces the total energy consumption and heat generation compared to having all color LEDs simultaneously active, while still achieving full-color display capability through temporal multiplexing that exploits the persistence of vision.
2Illumination intensity
If a micro-display with high luminosity is used in a portable device, then the readability in high luminance environments is improved, but the device size increases making it difficult to integrate into head mounted devices
Solution Approach 1:
The patent combines multiple functions into a single integrated structure: the LED light source serves both as the illumination source and as the display element, eliminating the need for separate backlight units and display panels. The sequential color capability is achieved by time-multiplexing three LED sources, effectively merging what would traditionally require three separate display systems into one compact unit.
Solution Approach 2:
By using sequential activation of red, green, and blue LED sources rather than having them all active simultaneously, the patent reduces the peak power requirements and thermal load, enabling high luminosity display in a compact form factor suitable for portable and head-mounted applications.
3Illumination intensity
If a micro-display with high luminosity is used in a portable device, then the readability in high luminance environments is improved, but the device complexity increases due to complex laser source and optical design
Solution Approach 1:
The patent extracts and eliminates the complex optical components typically required in conventional display systems, such as separate laser sources, beam combiners, and complex optical path management. By using directly emitting LED sources that can be sequentially activated, the system removes the need for sophisticated optical design while maintaining high luminosity performance.
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 improved user comfort by reducing heat dissipation and projector size, facilitating integration into portable devices while maintaining high luminosity for effective augmented reality applications.
Implementation Method 1
a linear array of light sources emitting a light beam, the linear array of light sources emitting at at least a first wavelength
Implementation Method 2
the scanning mean comprises a reflecting optic configured to direct the light beam towards a surface reflecting light towards an eye of the user or towards an eye of the user
Data Source
Figure 1
Figure 2a~2d
Figure 3~4
AI summary
The invention relates to a head mounted device (100) comprising: - at least an optical system (110) designed to be placed in front of the eye of the user and having a back face, - at least one projector (1) embedded into the optical system (110) and configured to project an image through the back face of the optical system towards the eye of the user, the projector comprising: • a linear array (10) of light sources emitting a light beam (14), the linear array (10) of light sources emitting at at least a first wavelength and extending in a first direction; • a scanning mean (40) configured to move the light beam (14) on a second direction transverse to the first direction to display the image; • a control unit (12) for controlling the scanning mean (40) and the light sources of the linear array (10).