Analysis of light emitting diode array lighting system based on human vision: normal and abnormal uniformity...

Area of Science:

• Optoelectronics and Lighting Technology
• Human-Computer Interaction
• Visual Perception

Background:

• Uniform lighting is crucial for display systems and visual comfort.
• Traditional methods like Sparrow's Criterion (SC) do not fully account for human visual perception.
• Light-emitting diode (LED) arrays are increasingly used in various lighting applications.

Purpose of the Study:

• To systematically study the conditions for uniform lighting in LED arrays.
• To introduce and evaluate the contrast sensitivity function (CSF) as a criterion for uniform lighting, considering human vision.
• To compare the CSF method with the conventional Sparrow's Criterion (SC) for optimizing LED array lighting systems.

Main Methods:

• Adoption of the contrast sensitivity function (CSF) as the primary criterion for uniform lighting.
• Analytical combination of design parameters: system thickness, LED pitch, LED spatial radiation distribution, and viewing conditions.
• Calculation and comparison of optimum system thicknesses and LED pitches using CSF versus SC methods for a specific LED array lighting system (LALS).

Main Results:

• The CSF method yields more appropriate optimum design parameters for LED array lighting systems than the SC method.
• Identified a non-monotonic variation in uniformity with structural parameters for non-Lambertian LEDs in LALS.
• Demonstrated the analytical combination of key design parameters through the CSF approach.

Conclusions:

• The CSF method offers superior optimization for uniform LED lighting, considering human visual perception.
• A novel design methodology for LALS is proposed, enhancing practicality, reducing cost, and improving aesthetics.
• Understanding non-monotonic uniformity variations is key for advanced LED array designs.