Design of optical element combining Fresnel lens with microlens array for uniform light-emitting diode lighting

2012 ◽  
Vol 29 (9) ◽  
pp. 1877 ◽  
Author(s):  
Guangzhen Wang ◽  
Lili Wang ◽  
Fuli Li ◽  
Depeng Kong
Keyword(s):  
Light Emitting Diode ◽  
Optical Element ◽  
Microlens Array ◽  
Fresnel Lens ◽  
Light Emitting

scholarly journals Luminous Intensity Field Optimization for Antiglare LED Desk Lamp without Second Optical Element

2020 ◽  
Vol 10 (7) ◽  
pp. 2607 ◽  
Author(s):  
Zhi-Ting Ye ◽  
Chieh Chang ◽  
Mao-Chieh Juan ◽  
Kuei-Jung Chen
Keyword(s):  
Light Emitting Diode ◽  
Optical Element ◽  
Spatial Effect ◽  
Experimental Results ◽  
Luminous Intensity ◽  
Beam Angle ◽  
Intensity Curve ◽  
Light Emitting ◽  
Human Eye ◽  
Intensity Field

This study proposes a model of a light module with an optimized luminous intensity field for realizing an antiglare light-emitting diode (LED) desk lamp without a second optical element. We simulated different luminous intensity field profiles to analyze the unified glare rating (UGR) and illumination uniformity performance of a desk lamp. The spatial effect of UGR and the illumination uniformity affect eye comfort. The light module was set to different beam angles without a second optical element, louver structure, and reflective element on the luminaire to compare different UGRs and uniformity values for evaluating human eye comfort. The simulation and experimental results indicated that the luminous intensity curve for a beam angle of 90° achieved an illumination uniformity of 80% and a UGR of 18.1 at a height of 45 cm, thus realizing a human-friendly antiglare desk lamp.

The Design of Freeform Surface Fresnel Lens Used for LED Uniform Illumination

2014 ◽  
Vol 571-572 ◽  
pp. 976-979 ◽  
Author(s):  
Yi Dan Dai ◽  
En Shi Qu ◽  
Li Yong Ren ◽  
Xin Chao Du ◽  
Hai Juan Ju
Keyword(s):  
Heat Dissipation ◽  
Light Emitting Diode ◽  
Fresnel Lens ◽  
Simulation Software ◽  
Light Distribution ◽  
Freeform Surface ◽  
Optical Simulation ◽  
Uniform Illumination ◽  
Light Emitting ◽  
Ray Tracing Simulation

This paper presents a new kind of light emitting diode(LED) secondary light distribution lens which adopts the type of Fresnel lens surface. The research purpose of this paper is to improve the LED heat dissipation efficiency of the secondary light distribution lens and the light efficiency, so as to prolong the service life of the LED. In this paper, we use the numerical method for solving the partial differential equation to establish a freeform surface lens which could produce uniform illumination, then the innovative method of combine the Fresnel lens structure with freeform surface lens was proposed. The design of freeform surface Fresnel lens allows dramatically cut the thickness of the lens (as well as the weight and volume) , it can solve the problem of difficulty in heat dissipation. By comparing the ray tracing simulation results of original freeform surface lens and freeform surface Fresnel lens in optical simulation software, experiments show that the latter not only shows the same degree of illumination uniformity, but also greatly reduced the thickness of the lens.

scholarly journals Enhanced light out-coupling of organic light-emitting diode using metallic nanomesh electrodes and microlens array

2013 ◽  
Vol 21 (7) ◽  
pp. 8535 ◽  
Author(s):  
Yu-Hsuan Ho ◽  
Kuan-Yu Chen ◽  
Kai-Yu Peng ◽  
Ming-Chih Tsai ◽  
Wei-Cheng Tian ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Microlens Array ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

scholarly journals Compound Optical Film Using Gray Scale Mask Embedded with Microvoids

2012 ◽  
Vol 2012 ◽  
pp. 1-10
Author(s):  
C. T. Pan ◽  
Y. C. Chen ◽  
Y. J. Chen ◽  
W. C. Wang ◽  
H. C. Yang ◽  
...  
Keyword(s):  
Soft Lithography ◽  
Optical Measurement ◽  
Light Emitting Diode ◽  
Microlens Array ◽  
Gray Scale ◽  
Variable Size ◽  
Optical Efficiency ◽  
Light Emitting ◽  
Optical Film ◽  
Light Diffusion

This study presents a compound optical film to improve luminance and uniformity to apply in side-LED (light-emitting diode) backlight module. LIGA (lithographie galvanoformung abformung) technology, soft lithography, and homemade gray scale mask were combined to fabricate microlens array. Optical film with variable size microlens array embedded with microvoids was designed and manufactured. FRED software was used to simulate optical performance. Microvoids were quantitatively embedded in the PDMS (polydimethylsiloxane) optical film. Under the quantitative control of air pressure, those microvoids inside the optical film can cause light diffusion. The compound optical film with embedded microvoids, multiaspect ratio, and variable size microlens array can be fabricated quickly without substrate. Luminance colorimeter BM-7A from TOPCON was used to carry out the optical measurement. According to the measured data, the compound optical film with embedded microvoids can enhance the luminance up to 5% and the uniformity up to 6.5%  ~  8.4%. The optical efficiency can be improved via the compound optical film.

Microlens array diffuser for a light-emitting diode backlight system

2006 ◽  
Vol 31 (20) ◽  
pp. 3016 ◽  
Author(s):  
Sung-Il Chang ◽  
Jun-Bo Yoon ◽  
Hongki Kim ◽  
Jin-Jong Kim ◽  
Baik-Kyu Lee ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Microlens Array ◽  
Light Emitting

scholarly journals Single-shot 3D wide-field fluorescence imaging with a Computational Miniature Mesoscope

2020 ◽  
Vol 6 (43) ◽  
pp. eabb7508
Author(s):  
Yujia Xue ◽  
Ian G. Davison ◽  
David A. Boas ◽  
Lei Tian
Keyword(s):  
Light Emitting Diode ◽  
Lightweight Design ◽  
Three Dimensional ◽  
Microlens Array ◽  
Computational Imaging ◽  
Depth Of Field ◽  
Wide Field ◽  
Single Shot ◽  
Light Emitting ◽  
Imaging Capability

Fluorescence microscopes are indispensable to biology and neuroscience. The need for recording in freely behaving animals has further driven the development in miniaturized microscopes (miniscopes). However, conventional microscopes/miniscopes are inherently constrained by their limited space-bandwidth product, shallow depth of field (DOF), and inability to resolve three-dimensional (3D) distributed emitters. Here, we present a Computational Miniature Mesoscope (CM2) that overcomes these bottlenecks and enables single-shot 3D imaging across an 8 mm by 7 mm field of view and 2.5-mm DOF, achieving 7-μm lateral resolution and better than 200-μm axial resolution. The CM2 features a compact lightweight design that integrates a microlens array for imaging and a light-emitting diode array for excitation. Its expanded imaging capability is enabled by computational imaging that augments the optics by algorithms. We experimentally validate the mesoscopic imaging capability on 3D fluorescent samples. We further quantify the effects of scattering and background fluorescence on phantom experiments.

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