Imaging Structure Emitter Calibration for Wearable Displays
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Solution Overview
Problem
Conventional LED array scanning systems for display technologies are too large and complex for wearable devices, leading to slow refresh rates, blurred image quality, and limited color depth due to varying light efficiency across emitters, which cannot be effectively adjusted during use.
Innovation Solution
An imaging structure emitter calibration method that continuously monitors and corrects light levels from embedded light sources, allowing for individual control of each emitter to adjust for operational conditions, using a light sensor to compute correction values and implement calibration inputs for each emitter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional LED array scanning systems are used, then light emission can be achieved, but the systems are too large and complex for wearable devices
Solution Approach 1:
The system divides the emitter array into individually controllable segments, allowing each emitter to be independently calibrated and controlled. This segmentation enables compact integration in wearable devices while maintaining precise control over light output from each emitter element.
Solution Approach 2:
The system dynamically adjusts operational parameters of individual emitters through calibration processes. By changing parameters such as drive current and emission intensity for each emitter based on measured performance, the system compensates for manufacturing variances and maintains consistent light output across the array.
2Speed
If emitters are modulated in sequence in a scanning system, then light can be directed across a surface, but the refresh rate becomes slow and image quality blurs
Solution Approach 1:
The system performs preliminary calibration of each emitter before normal operation, measuring and storing correction factors that compensate for individual emitter variations. This preliminary action enables faster scanning without image quality degradation, as the calibration data allows for optimized modulation of each emitter during operation.
Solution Approach 2:
The system incorporates feedback mechanisms where light output from each emitter is measured and used to adjust drive parameters. This feedback loop enables real-time optimization of emitter performance, maintaining high refresh rates and sharp image quality by continuously adapting to emitter variations and operational conditions.
3Reliability
If correction curves are determined during manufacture, then emitter variances can be adjusted, but the curves cannot be adjusted during use
Solution Approach 1:
The system transitions from static manufacturing calibration curves to dynamic calibration that can be updated during operation. Each emitter's correction factors are stored and can be adjusted in response to operational conditions such as temperature changes, aging, and usage patterns, enabling adaptability while maintaining light output consistency.
Solution Approach 2:
The system performs self-calibration during normal operation, automatically measuring emitter performance and adjusting drive parameters without external intervention. This self-service capability allows the system to maintain optimal performance over time while adapting to changing conditions, eliminating the need for manual recalibration.
4Measurement precision
If individual emitters are tested at various emission points during production, then light efficiency can be characterized, but testing becomes difficult and expensive
Solution Approach 1:
The system uses a universal calibration approach where a single measurement process characterizes multiple emitters simultaneously. By measuring light output across the entire emitter array under controlled conditions, the system obtains comprehensive calibration data for all emitters without requiring separate testing for each individual emitter, reducing complexity and cost.
Solution Approach 2:
The system creates a digital model or copy of each emitter's performance characteristics through measurement and storage of correction factors. This copying approach allows for precise characterization of emitter light efficiency without physical manipulation or complex testing procedures, simplifying the measurement process while maintaining high precision.
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 enhances image quality by maintaining consistent light output across emitters, improving refresh rates and color depth, and enabling fault-tolerant operation by compensating for emitter failures, thus overcoming the limitations of conventional systems.
Implementation Method 1
A reflective panel reflects a portion of the light to illuminate a light sensor. An imaging application receives the sensor data from the light sensor, where the sensor data corresponds to emitted light output from the emitter structure.
Data Source
AI summary
In embodiments of imaging structure emitter calibration, an imaging unit includes an emitter structure that direct emits light, and optics direct the light along a light path in the imaging unit to illuminate a projection surface. A reflective panel reflects a portion of the light to illuminate a light sensor. An imaging application receives the sensor data from the light sensor, where the sensor data corresponds to emitted light output from the emitter structure. The imaging application can then initiate a calibration input to the emitter structure to adjust the emitted light output from the emitter structure.