Head-Mounted Optical Display Using Micro-LEDs for Low-Power Brightness
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Solution Overview
Problem
Conventional head-mounted devices (HMDs) are heavy, difficult to carry for extended periods of time, and offer a limited field of view and a displeasing experience for the user, and they suffer from low brightness, high power consumption, and have a short lifespan due to the use of cathode ray tubes, liquid-crystal displays, and organic light-emitting diodes, which are inefficient and bulky.
Innovation Solution
A head-mounted device with a frame having adjustable arms, a micro-LED display, and an optical system that projects images onto the user's eye, reducing the need for cables and connectors, and using sensors to detect eye motion and adjust the focal point for a more immersive experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional displays (CRT, LCD, LCOS, OLED) are used in HMDs, then the device can display images, but the brightness is low, power consumption is high, and lifespan is short
Solution Approach 1:
The patent changes the fundamental parameter of the light source by transitioning from conventional displays (LCD, OLED, CRT) to laser-based illumination. This parameter change enables high brightness output with low power consumption, as lasers convert electrical energy to optical energy with high efficiency and can operate continuously for thousands of hours, resolving the contradiction between brightness and power consumption.
2Ease of operation
If digital projectors and microscopic mirrors are embedded in HMDs to project images, then images can be displayed, but the device becomes heavy and bulky
Solution Approach 1:
The patent extracts and eliminates the heavy mechanical components (digital projectors and microscopic mirrors) from the HMD system. Instead of using these complex projection mechanisms, the invention employs a simplified laser-based direct illumination system where laser diodes illuminate the display panel directly, removing the need for bulky projection optics and reducing overall device weight.
Solution Approach 2:
The patent replaces the mechanical projection system (mirrors and projectors that physically move and redirect light) with an optical system based on laser diodes and waveguides. This substitution eliminates moving parts and complex mechanical structures, significantly reducing device weight while maintaining image projection capability.
3Ease of operation
If conventional HMD structures with complicated light paths are used, then images can be projected to the user's eye, but the device becomes bulky and light efficiency is low
Solution Approach 1:
The patent replaces the complicated mechanical light path system with an integrated optical system using laser diodes and waveguide technology. The laser light is coupled into the waveguide which directs it to the user's eye through total internal reflection, eliminating the need for multiple mirrors, lenses, and complex mechanical adjustments, thus simplifying the overall structure while maintaining effective light delivery.
Solution Approach 2:
The patent merges multiple separate components (light source, optical path, and display elements) into an integrated system where the laser diode array is directly coupled with the display panel and waveguide structure. This consolidation reduces the number of separate optical components and simplifies the overall device architecture, reducing bulkiness while maintaining projection functionality.
4Productivity
If lots of light is lost in the path from display to eye in conventional HMDs, then the device can function, but power efficiency is very low
Solution Approach 1:
The patent replaces the inefficient conventional light transmission path with an optical waveguide system based on total internal reflection. The waveguide structure channels laser light directly to the user's eye with minimal loss, as the light is confined and guided through the waveguide material rather than being scattered or absorbed by multiple optical interfaces, thereby dramatically improving both light transmission efficiency and overall power efficiency.
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 device provides a high-quality, immersive visual experience with low power consumption, a wider field of view, and a more compact design by using micro-LED displays and adjustable arms for improved comfort and flexibility.
Implementation Method 1
an optical system configured to project an image from the display to a user's eye
Implementation Method 2
an optical system placed between the display and the user's eye to project images efficiently
Implementation Method 3
at least one display coupled at a proximity edge of the at least one arm
Implementation Method 4
micro-LED display mounted on the frame
Data Source
AI summary
Systems, devices, and methods for a head-mounted device are provided. In some examples, a head-mounted device comprising a frame having at least one arm that may be adjustable, at least one display coupled at a proximity edge of the at least one arm, an electronic system coupled at a proximity another edge of the at least one arm, a data processing unit configured to send and receive data from the display, wherein the data processing unit coupled through the arm between the electronic system and the display; and an optical system configured to project an image from the display to a user's eye, wherein the optical system is mounted at the top of the display.