AR Glasses LED Driving Power Optimization
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Solution Overview
Problem
Augmented reality (AR) glasses face challenges in miniaturization and weight reduction due to high power consumption caused by low light-emitting efficiency of micro LEDs and inefficient waveguides, which worsen power consumption when providing high-luminance content.
Innovation Solution
An electronic device with a power supply, display comprising multiple LEDs, and a waveguide, where the light-outputting efficiency of the waveguide is optimized by varying driving power for each color based on diffraction efficiency, reducing power consumption while maintaining suitable white balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If micro LEDs are used for miniaturization and weight reduction, then device size and weight are reduced, but power consumption increases due to low light-emitting efficiency
Solution Approach 1:
The patent adjusts the driving current parameters of individual LEDs based on their color characteristics and the waveguide's diffraction efficiency for each color. By optimizing the driving current for red, green, and blue LEDs separately, the system achieves high luminance output with reduced power consumption, resolving the contradiction between miniaturization and power efficiency.
2Illumination intensity
If high luminance is required for content display through waveguides, then display quality improves, but power consumption increases due to low waveguide efficiency
Solution Approach 1:
The patent applies different driving strategies to different color LEDs based on the waveguide's color-specific diffraction efficiency. By tailoring the driving current for each color channel (red, green, blue) according to its specific efficiency characteristics, the system achieves high overall luminance while minimizing total power consumption.
3Loss of energy
If OLED-based LCoS is used to achieve high optical efficiency, then optical efficiency improves, but device volume increases limiting miniaturization
Solution Approach 1:
The patent uses micro LEDs as a compact light source that replicates the high optical efficiency benefits of larger systems. By utilizing the waveguide's diffraction properties to distribute and optimize light from small micro LEDs, the system achieves high optical efficiency in a miniaturized form factor, avoiding the need for bulky OLED-based LCoS components.
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 reduces power consumption and heat generation, increasing the usage time of AR glasses by controlling light-outputting efficiency and driving power for each color, ensuring efficient content delivery through LEDs and waveguides.
Implementation Method 1
a waveguide configured to receive the light emitted by the LEDs and to output the light towards a user's eye
Implementation Method 2
The DOEs may have different depths according to colors of the LEDs
Data Source
AI summary
An electronic device includes a power supply; a display including light-emitting diodes (“LED”s), a projection lens, and a waveguide arranged in a way such that light emitted from the LEDs is input to the waveguide through the projection lens, and light-outputting efficiency of the waveguide for a first color is higher than light-outputting efficiency of the waveguide for a second color; a memory; and a processor which determines a first driving power for a first LED which emits light of the first color and a second driving power for a second LED which emits light of the second color based on the light-outputting efficiencies of the waveguide for the first color and the second color, and controls the power supply in a way such that the first and second driving powers are supplied to the first and second LEDs, respectively.