Fabrication of gapless dual-curvature microlens as a diffuser for a LED package

Pan, C. T.; Chen, M.F.; Cheng, Po Jen; Hwang, Yeong‐Maw; Tseng, Shih-Chuan; Huang, J.C.

doi:10.1016/j.sna.2008.12.010

Cited by 26 publications

(13 citation statements)

References 35 publications

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“…Diffuser layers were used to diffuse blue rays so that optical path lengths in all direction become similar. This adverse effect was alleviated in polymer-based white LEDs by using light diffuser layer coating [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Phosphor-in-glasses composites containing light diffusers for high color uniformity of white-light-emitting diodes

Chung

Heo

2015

J Sol State Light

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ZrO 2 light diffuser layers was placed on phosphor-in-glass composites (PiGs) to improve color uniformity of white-light-emitting diodes (white LEDs). Color coordinates of central part and periphery of white LEDs were (0.34, 0.38) and (0.36, 0.43), respectively; difference between two area decreases with the introduction of a diffuser layer. Color temperature difference also decreased from 770 to 464 K. The addition of diffuser layers reduced the luminous efficacy of the white LEDs from 90.3 to 83.4 lm/W.

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Section: Introductionmentioning

confidence: 99%

Phosphor-in-glasses composites containing light diffusers for high color uniformity of white-light-emitting diodes

Chung

Heo

2015

J Sol State Light

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“…It is widely used in various applications such as LED light systems, backlight unit (BLU) of liquid crystal display (LCD), signs, etc. [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…There are various methods for fabricating surface-relief type such as replica molding method [14,15], embossing process [7,16,17], lithography [8,18,19], electrospray method [20,21], etching [22,23], holographic technology [24], etc. According to the different preparation methods, the micro-structure can be a hemisphere [14,15,20,21], paraboloidal shape [8], polygonal shape [3,26], pyramid [27,28], cylindrical lens [16], V-shaped mirror [17], or irregular type [4,19,22,23], etc. Shih et al [14] casted a liquid PDMS into concave microlens molds to form the PDMS microlens array with good light diffusing effect.…”

Section: Introductionmentioning

confidence: 99%

A facile fabrication of light diffusing film with LDP/polyacrylates composites coating for anti-glare LED application

Song

Sun

Lin

et al. 2013

Applied Surface Science

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“…Wei et al measured the luminance efficiency along with the fill factor of square-shaped microlens array film attached to planar organic light-emitting diodes panels (Wei et al 2006). The packaging method for LEDs used gapless dual-curvature microlens array to enhance the panel illumination (Pan et al 2009). …”

Section: Introductionmentioning

confidence: 99%

“…Microlens array fabrication is needed both for higher accuracy and lower cost in the rapid growth of commercial optical devices. Pan et al used a process to fabricate a high fillfactor dual-curvature microlens array (Pan et al 2009). This process mainly includes conventional ultraviolet (UV) lithography, a photoresist reflow process and Ni-Co electroplating.…”

Section: Introductionmentioning

confidence: 99%

New high fill-factor dual-curvature microlens array fabrication using UV proximity printing

2011

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A new high fill-factor dual-curvature microlens array fabrication method using lithographic proximity printing process is reported. The proposed technology utilizes UV proximity printing by controlling a printing gap between the mask and substrate. The designed microlens array pattern with high density can produce a high fill-factor dual-curvature microlens array in photoresist. Because the UV light diffraction deflects away from the aperture edges and produces exposure in photoresist material outside the aperture edges, this method can precisely control the geometric profile of a high fill factor dual-curvature microlens array. The experimental results showed that the dual-curvature micro-lens array can be formed automatically in photoresist when the printing gap ranged from 360 to 600 μm. The gapless dual-curvature microlens array will be used to enhance the luminance uniformity for light-emitting diodes (LEDs)

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Fabrication of gapless dual-curvature microlens as a diffuser for a LED package

Cited by 26 publications

References 35 publications

Phosphor-in-glasses composites containing light diffusers for high color uniformity of white-light-emitting diodes

Phosphor-in-glasses composites containing light diffusers for high color uniformity of white-light-emitting diodes

A facile fabrication of light diffusing film with LDP/polyacrylates composites coating for anti-glare LED application

New high fill-factor dual-curvature microlens array fabrication using UV proximity printing

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