KEYWORDS: Light emitting diodes, Near field, LED lighting, LED displays, Receivers, Near field optics, Photometry, Array processing, Lithium, Optical properties
For achieving uniform near-field illumination, this paper is based on the theory that each LED is non-perfect Lambertian
emitter, whose irradiance distribution obeys the power law. Using the theory of sparrow's criterion, two methods to
realizing near-field uniform irradiance of LED arrays are discussed by taking into account of the production process of
LED array, a conclusion can be made that adjusting the curve to achieve uniform near-field irradiance is impossible but
adjusting the space could. The structural characteristics of three typical LED arrays are analyzed. The equations of the
relationship between illumination and space, as well as the optimal arrangements of the LED arrays are given. The nearfield
optical properties for LED arrays with the optimal arrangement structure are simulated by MATLAB. By using a
photometer we measure the irradiance intensity of the LED arrays, and make comparisons between experimental results
and theoretical results, the result shows it works well.
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