One-step fabrication of surface-relief diffusers by stress-induced undulations on elastomer

Wang, Jui Hao; Chen, Chia Fu; Ho, Jeng Rong; Shih, Teng Kai; Chen, Chien‐Chung; Whang, Wha Tzong; Yang, Jung Yen

doi:10.1016/j.optlastec.2008.12.005

Cited by 20 publications

(17 citation statements)

References 12 publications

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“…As an interesting application of wrinkles, Wang et al recently proposed light diffusers that could be used as elements in light‐emitting diode display panels, etc . If wrinkles could be formed in specific areas, they would be useful for other applications, such as designed interior lights and templates to arrange microparticles in a desired area .…”

Section: Resultsmentioning

confidence: 99%

Area‐selective microwrinkle formation on poly(dimethylsiloxane) by treatment with strong acid

Watanabe

Hashimoto

2014

J Polym Sci B Polym Phys

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Microwrinkles were formed by treating poly(dimethylsiloxane) (PDMS) surfaces with a mixture of concentrated sulfuric acid and nitric acid at 80 °C followed by a water rinsing step. The acid treatment oxidized the treated area, which also swelled owing to absorption of water during the rinsing step. This absorption of water induced a compressive stress on the PDMS surface that caused the formation of wrinkles. The appearance of wrinkles was controlled by the time interval between the end of the acid treatment and the beginning of the water rinsing step. Wrinkles were formed when the time interval was shorter than 5 s, as water was absorbed by the hygroscopic acid molecules within the treated surface. For longer time intervals of 300 s, this phenomenon was not observed. Based on these findings, a procedure for forming wrinkles in specific areas was developed by hydrating the chosen areas with wet filter paper cut into specific shapes after the acid treatment. The formation of wrinkles was confined to the area under the piece of paper. The orientation and alignment of the wrinkles at the boundaries were also characterized. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 53, 167–174

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Section: Resultsmentioning

confidence: 99%

Area‐selective microwrinkle formation on poly(dimethylsiloxane) by treatment with strong acid

Watanabe

Hashimoto

2014

J Polym Sci B Polym Phys

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“…On the basis of different diffusing principles, the light diffusing films can be classified into two types: the particle-diffusing type [9][10][11][12][13] and the surface-relief type [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

“…When the light passes through the surface with microstructure, a refraction event occurs between the interface of the film and the air, and the incident light is deflected from its course, resulting in light diffusion. 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.…”

Section: Introductionmentioning

confidence: 99%

“…Ahn and Kim [21] fabricated uniform microsized poly(methyl methacrylate) hemispherical droplets on poly(ethylene terephthalate) films by a modified electrospraying process for use as optical diffusers. Wang et al [22] dipped poly(dimethyl siloxane) films into the H 2 SO 4 /HNO 3 solution and obtained microscale surface undulations which could serve as the surface relief diffusers. The optical properties of surface-relief type films are intimately linked with the transparency of the materials and the design parameters of the micro-structures [25,28] such as their geometric shape, size, distribution pattern, density and so on.…”

Section: Introductionmentioning

confidence: 99%

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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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“…3 Wang et al demonstrated a method of microscale surface undulations induced by acid treatment for the mass production of surface-relief diffusers. 4 However, it is still a challenge to achieve high luminance and good uniformity for a wide angle. At present, the utilization of surface-relief microstructures, such as microlens arrays, as light diffusers has become the most advanced solution due to its simplicity and high-luminance extraction efficiency.…”

Section: Introductionmentioning

confidence: 99%

Novel direct‐view LED backlight unit with an aspheric microlens array and a rough‐texture sheet

Tsou¹,

Chang²,

Lai³

et al. 2010

J Soc Info Display

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Abstract— This study proposes a novel direct‐view light‐emitting‐diode (LED) backlight unit with a high‐fill‐factor aspheric microlens array and a rough‐texture sheet. An aspheric microlens array and a rough‐texture sheet made from polysiloxine were used as the grating element and optical diffuser, respectively, which increases light‐extraction efficiency and improves luminance uniformity. The specific aspheric microlens‐array mold was fabricated by using a heating encapsulated air process based on a glass wafer. This microlens array has the features of high fill factor and square‐foot boundary with a continuous surface‐relief profile. This unique out‐of‐plane surface profile creates a square light pattern with uniform luminance, and thus composes a uniform large‐sized light pattern exactly in accordance with the layout of the LED array. The rough‐texture sheet, which can scatter light uniformly, was formed by fine‐grit‐sandpaper molding. Experimental results show that by using an aspheric microlens array and rough‐texture sheet reported here as the backlight diffusing components is highly effective in improving light uniformity at a wide viewing angle. An increase in illuminance by more than 10% was achieved in comparison with commercial backlight modules. Low cost in fabricating the aspheric microlens array and rough‐texture sheet is anticipated due to the simplicity of the process.

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One-step fabrication of surface-relief diffusers by stress-induced undulations on elastomer

Cited by 20 publications

References 12 publications

Area‐selective microwrinkle formation on poly(dimethylsiloxane) by treatment with strong acid

Area‐selective microwrinkle formation on poly(dimethylsiloxane) by treatment with strong acid

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

Novel direct‐view LED backlight unit with an aspheric microlens array and a rough‐texture sheet

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