Near-Eye Display Dual-Power Light Sources for Peripheral Objects
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Solution Overview
Problem
Designing electronic devices with displays, such as virtual and augmented reality headsets, poses challenges in achieving desired optical performance while minimizing bulkiness and excessive power consumption.
Innovation Solution
The use of low and high power light sources in near-eye displays, where low power sources are activated for peripheral virtual objects and both are used for larger or brighter objects, conserving power without sacrificing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high power light sources are used to ensure image quality, then illumination intensity is improved, but power consumption increases
Solution Approach 1:
The illumination optics dynamically adjust between different operating states (first state with both high and low power light sources active, second state with only low power light sources active) based on the characteristics of virtual objects in the image data, allowing the system to optimize power consumption while maintaining image quality
Solution Approach 2:
The light source set is segmented into multiple light sources with different power levels (high power and low power light sources), allowing selective activation based on the specific illumination requirements of different virtual objects in the display
2Reliability
If high power light sources are activated for all virtual objects, then image quality is maintained, but power consumption increases
Solution Approach 1:
Different power levels of light sources are applied locally based on the specific requirements of virtual objects in different regions of the field of view, with low power light sources sufficing for peripheral objects and high power light sources activated only when needed for central or brighter objects
Solution Approach 2:
The system applies partial action by activating only the necessary subset of light sources (low power only, or both low and high power) based on the specific image data requirements, avoiding the excessive activation of all high power light sources for all display scenarios
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 minimizes power consumption while maintaining image clarity, extending battery life and ensuring optimal display performance.
Implementation Method 1
Each light source set may be formed from emissive surfaces of respective light-emitting diode (LED) packages
Data Source
AI summary
A display may include illumination optics, a spatial modulator, and a waveguide. The illumination optics may produce illumination that is modulated by the spatial modulator to produce image light. The waveguide may direct the image light towards an eye box. The illumination optics may include light source sets that produce the illumination. Each set may include a low power light source and a high power light source. In a first state, the high and low power light sources may be active. In a second state, the low power light sources may be active. Control circuitry may adjust between the first and second states based on image data. The second state may be used when virtual objects in the image data are confined to a peripheral region of the field of view of the eye box.