Retinal Display Power Control via Pupil Size Detection
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Solution Overview
Problem
Natural pupil adaptation mechanisms are disrupted in optical display systems with exit pupils smaller than the eye's pupil size, leading to inconsistent retinal illumination, which affects display performance.
Innovation Solution
A wearable device with a retinal see-through display that includes sensors to determine pupil size and local luminance levels, using calculators and controllers to adjust display power and luminance to match the user's pupil size and ambient conditions, ensuring optimal image visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the exit pupil of the optical display system is made smaller than the eye pupil size, then the display can be more compact and wearable, but the natural pupil adaptation mechanism is disrupted and retinal illumination becomes inconsistent
Solution Approach 1:
The display power is dynamically adjusted based on detected pupil size variations. The system continuously monitors pupil diameter changes and modifies display luminance in real-time to compensate for the disrupted natural adaptation mechanism, ensuring consistent retinal illumination despite the reduced exit pupil size
Solution Approach 2:
A feedback loop is implemented where pupil size is optically detected and used to control display power output. The system measures actual pupil diameter, compares it to reference values, and adjusts display luminance accordingly to maintain optimal retinal illumination levels
2Illumination intensity
If the display power is increased to improve image visibility, then image contrast and visibility are enhanced, but power consumption increases and may cause visual discomfort
Solution Approach 1:
Display power is dynamically scaled according to actual pupil size measurements. When pupils are dilated (indicating need for more light), display luminance is increased; when pupils are constricted, luminance is reduced. This dynamic adjustment optimizes visibility while minimizing power consumption and preventing visual discomfort from excessive brightness
3Reliability
If the display power is adjusted to match pupil size, then retinal illumination consistency is improved, but the device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The optical element serving as the display medium also functions as the detection pathway for pupil size measurement. The same optical path used to deliver display images to the retina is utilized to detect pupil diameter, eliminating the need for separate detection hardware and reducing overall system complexity
Solution Approach 2:
The display system uses its own optical output to facilitate pupil detection. By analyzing the interaction between display light and the pupil, the system self-determines pupil size without requiring external or separate sensing mechanisms, thereby simplifying the overall device architecture
Data Source
AI summary
Apparatuses, methods and storage medium associated with retinal see through display are disclosed herein. In embodiments, an apparatus may comprise a retinal see through display wearable by a user; a target luminance calculator to determine a required luminance level; and a display power controller to determine a power level for the retinal see through display, based at least in part on a pupil size of the user and the determined required luminance level. Other embodiments may be described and/or claimed.