Eyewear Projector Brightness Control With Variable Feedback Loop
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Solution Overview
Problem
Existing augmented reality and virtual reality eyewear systems lack effective brightness control mechanisms that adapt to varying ambient light conditions, leading to discomfort and reduced image visibility.
Innovation Solution
The eyewear incorporates a variable feedback loop that controls the forward current to a colored light source, allowing it to switch between high brightness in outdoor settings and nominal brightness indoors, enhancing image visibility in different lighting conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the projector operates at high brightness, then image visibility in outdoor settings is improved, but energy consumption increases and the device may overheat
Solution Approach 1:
The patent implements dynamic brightness adjustment by switching between high brightness mode for outdoor use and normal brightness mode for indoor use. The controller dynamically adjusts the forward current to the light source based on ambient light conditions, enabling the projector to adapt its illumination intensity rather than operating at a fixed high brightness level.
Solution Approach 2:
The patent changes the operating parameters of the light source by adjusting the forward current through different feedback resistance values. The controller selectively establishes different feedback loop configurations (with different resistance values) to control the light source at different brightness levels, thereby changing the electrical and optical parameters to match environmental conditions.
2Illumination intensity
If the projector operates at high brightness, then image visibility in outdoor settings is improved, but device temperature increases
Solution Approach 1:
The system dynamically adjusts brightness based on ambient light detection, operating at high brightness only when outdoors and switching to normal brightness indoors. This dynamic operation reduces the cumulative thermal load on the device while maintaining image visibility when needed.
Solution Approach 2:
The controller changes the electrical parameters (forward current) and optical parameters (brightness) of the light source based on environmental conditions, thereby controlling the thermal output to match operational requirements rather than continuously operating at maximum power.
3Device complexity
If a simple brightness control mechanism is used, then device complexity is reduced, but adaptability to varying ambient light conditions deteriorates
Solution Approach 1:
The patent employs feedback control mechanisms where the controller detects ambient light conditions and adjusts the light source brightness accordingly. The feedback loop uses resistance values to control the forward current, creating a closed-loop system that automatically adapts to varying ambient light conditions without requiring complex manual intervention.
Solution Approach 2:
The system performs self-adjustment of brightness based on ambient light detection. The controller automatically determines whether the device is being worn indoors or outdoors and adjusts the light source parameters accordingly, enabling the device to serve itself rather than requiring external control for each brightness adjustment.
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 provides adaptive brightness control, ensuring clear image display in both indoor and outdoor environments, improving user experience and comfort.
Implementation Method 1
a colored light source configured to generate a colored light beam to generate a displayed image
Implementation Method 2
The variable feedback loop in one example has a variable resistance to selectively generate a high brightness image
Data Source
Figure 1A
Figure 1B
Figure 2A
AI summary
Eyewear including a projector having a variable feedback loop controlling a forward current delivered to a colored light source. The colored light source is configured to generate a colored light beam to generate a displayed image. The variable feedback loop in one example has a variable resistance to selectively generate a high brightness image when the eyewear is operated outside, or in a high ambient light setting, and to selectively generate a nominal brightness image when the eyewear is operated inside. A controller selectively controls the drive current delivered to the colored light source to control the brightness mode of the image.