Brightness limitations in integrated lighting systems

Jannson, Tomasz; Arık, E.; Bennahmias, M.; Nathan, Nanda; Wang, Sam C.; Chua, Kian Ngiap; Pradhan, Ranjit D.; Forrester, Thomas; Yu, Kegen

doi:10.1117/12.718779

Cited by 2 publications

(4 citation statements)

References 4 publications

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“…Brightness, or phase-space density [7] , is in: W/m 2 Str, or, rather, it is an optical power per unit of area and per Fourier area [8] . In subjective units (Lumens instead of Watts), brightness, B, is called luminance [9] , in Lm/m 2 Str., or in Cd/m 2 = 1 nt.…”

Section: Brightnessmentioning

confidence: 99%

“…In the LED case, the luminous efficacy for red (640 nm) is K(λ) = 118 ℓm/W opt [8] , and basic efficacy can be assumed as 25 Lm/W el ; thus the regular efficiency is (25)/(118) = 0.21 W opt /W el , or 21%. Therefore, for LED input power: P o = 0.22 mW (see Section 5.1), the LED electrical power is (0.22)/(0.21) ≅ 1 mW.…”

Section: Electrical Power Managementmentioning

confidence: 99%

“…Assume a highpower 10 Cd source, with B o = 10 5 nt, and red color (640 nm), with V(λ) = 0.175, and K(λ) = 118 lm/W (see Ref. [8] for examples). Also assume, rather optimistically, that its Θ1/2=20 o .…”

Section: Brightnessmentioning

confidence: 99%

“…In subjective units (Lumens instead of Watts), brightness, B, is called luminance [9] , in Lm/m 2 Str., or in Cd/m 2 = 1 nt. It is very useful to introduce so-called generalized Lambertian sources [7,8,10,11] that satisfy the relation in the form of a generalized Lambert law:…”

Section: Brightnessmentioning

confidence: 99%

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System-on-chip-centric unattended embedded sensors in homeland security and defense applications

et al. 2009

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System-on-chip (SoC) single-die electronic integrated circuit (IC) integration has recently been attracting a great deal of attention, due to its high modularity, universality, and relatively low fabrication cost. The SoC also has low power consumption and it is naturally suited to being a base for integration of embedded sensors. Such sensors can run unattended, and can be either commercial off-the-shelf (COTS) electronic, COTS microelectromechanical systems (MEMS), or optical-COTS or produced in house (i.e., at Physical Optics Corporation, POC). In the version with the simplest electronic packaging, they can be integrated with low-power wireless RF that can communicate with a central processing unit (CPU) integrated in-house and installed on the specific platform of interest. Such a platform can be a human body (for e-clothing), unmanned aerial vehicle (UAV), unmanned ground vehicle (UGV), or many others. In this paper we discuss SoC-centric embedded unattended sensors in Homeland Security and military applications, including specific application scenarios (or CONOPS). In one specific example, we analyze an embedded polarization optical sensor produced in house, including generalized Lambertian lightemitting diode (LED) sources and secondary nonimaging optics (NIO).

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Section: Brightnessmentioning

confidence: 99%

Section: Electrical Power Managementmentioning

confidence: 99%

Section: Brightnessmentioning

confidence: 99%

Section: Brightnessmentioning

confidence: 99%

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System-on-chip-centric unattended embedded sensors in homeland security and defense applications

et al. 2009

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Diffuser screen with flat-top angular distribution of scattered light realized by a dual-beam holographic speckle

et al. 2021

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Holographic speckle screens with the Gaussian type distribution of scattered light, which are used to increase the viewing angle of the image in projection display systems, result in nonuniform image brightness in different observing positions. In this study, based on Helmholtz-Kirchhoff theory, a dual-beam scattering theory of rough surface is derived. By analyzing the spatial frequency spectrum of the scattered light, it is found that when two laser beams irradiated the ground glass at a certain angle, the resulting speckles recorded on the photoresist can generate a flat-top angular distribution of the scattered light. Speckle screens are fabricated by two light beams at different angles, and the angular intensity distribution of scattered light is measured. The results are in good agreement with the theory. Compared with the Gaussian type diffuser, the energy efficiency of the speckle screen proposed has a 46% increase when the angular luminance uniformity is set to be 80%, which effectively improves the brightness when used in a head up display system.

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Brightness limitations in integrated lighting systems

Cited by 2 publications

References 4 publications

System-on-chip-centric unattended embedded sensors in homeland security and defense applications

System-on-chip-centric unattended embedded sensors in homeland security and defense applications

Diffuser screen with flat-top angular distribution of scattered light realized by a dual-beam holographic speckle

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