Optical efficiency of LED displays with cylindrical transparent optical cavities

Jaroslaw Jarominski

doi:10.1364/AO.20.004161

Applied Optics
Vol. 20,
Issue 24,
pp. 4161-4166
(1981)
•https://doi.org/10.1364/AO.20.004161

Optical efficiency of LED displays with cylindrical transparent optical cavities

Jaroslaw Jarominski

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Jaroslaw Jarominski, "Optical efficiency of LED displays with cylindrical transparent optical cavities," Appl. Opt. 20, 4161-4166 (1981)

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Abstract

Formulas are derived describing the efficiency of light extraction from LED displays with transparent optical cavities. The efficiency is calculated for mirror-wall cavities and for cavities having walls formed by the air–epoxy interface. Results show that typical efficiency values for such cavities are 15% and for suitably designed air-filled cavities ~29%.

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Type of display	Assumptions	Light extraction efficiency [%]
I. Epoxy-filled with metallized walls	1. 100% walls reflectivity, zero epoxy absorption	28.2
	2. 100% walls reflectivity, 0.2 cm⁻¹ epoxy absorption	22.1
	3. 90% walls reflectivity, zero epoxy absorption	17.4
	4. 90% walls reflectivity, 0.2 cm⁻¹ epoxy absorption	12.3
	5. As point 4, with an infinitely thin scattering layer	14.8
II. Air-filled with metallized walls	1. 100% walls reflectivity, nonabsorbing scattering plate	7.1
	2. 100% walls reflectivity, 0.2 cm⁻¹ absorption in scattering plate	6.9
	3. 90% walls reflectivity, zero absorption in scattering plate	4.3
	4. 90% walls reflectivity, 0.2 cm⁻¹ absorption in scattering plate	4.2
	5. 100% walls reflectivity, infinitely thin scattering plate	27.4
	6. 90% walls reflectivity, infinitely thin scattering plate	16.6
III. Cavity with walls formed by air–epoxy interface (light refraction coefficient of epoxy n = 1.5)	1. Zero cavity absorption	9.6
	2. Zero cavity absorption, infinitely thin scattering area	16.0
	3. 0.2 cm⁻¹ cavity absorption	8.7
	4. 0.2 cm⁻¹ cavity absorption, infinitely thin scattering area	16.6
IV. Scattering cavity	1. Parameters according to Ref. 2	16.6
	2. As point 1 but without dye strip and without cavity-lead frame gap	22.6
	3. As point 2 but without epoxy absorption	29.2

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Applied Optics