Functional imprinting structures on GaN-based light-emitting diodes for light pattern modulation and light extraction efficiency enhancement

Tu, Sheng; Wu, Shang Yen; Lee, Yeeu Chang; Pan, Jui Wen; Kuo, Chia‐Hung; Wang, Chih–Ming; Chang, Jenq Yang

doi:10.1007/s10043-010-0070-z

Cited by 5 publications

(2 citation statements)

References 18 publications

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“…To collect light rays emitted from LEDs effectively, collective lens optics were designed with reference to various related technologies and inserted between the LEDs and fibers. [18][19][20][21][22] The end of each fiber was transformed to a square shape from approximately 20 mm from the fiber end to print patterns of square elements. The sequence used to deform optical fibers to square shapes is shown in Fig.…”

Section: Fabrication Of 10 ' 10 Fiber Matrixmentioning

confidence: 99%

Readability dependence on lithography conditions for printing code marks using a squared optical fiber matrix and light-emitting diodes

Watanabe¹,

Kato²,

Iwasaki³

et al. 2015

Jpn. J. Appl. Phys.

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The direct readability of code marks printed using a new exposure system was investigated. In the new exposure system, code-mark patterns were printed using LEDs as exposure sources and squared optical-fiber ends as code-mark elements. A 10 ' 10 fiber matrix was fabricated, and light emitted from each LED was led to each fiber. Because gaps appeared between the code-mark cells, a long exposure time was adopted, and the gaps between cells were eliminated by giving an overdose of light. After code-mark patterns were stably printed, their readability was investigated using a commercial code-mark reader. It was found that all the printed code marks were readable without errors. In concrete, same 100 identical marks printed on a wafer were readable. Moreover, six kinds of marks were repeatedly detected more than 100 times with no reading errors.

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Section: Fabrication Of 10 ' 10 Fiber Matrixmentioning

confidence: 99%

Readability dependence on lithography conditions for printing code marks using a squared optical fiber matrix and light-emitting diodes

Watanabe¹,

Kato²,

Iwasaki³

et al. 2015

Jpn. J. Appl. Phys.

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“…The chip fabrication process included mesa definition and etching, the addition of a transparent conductive layer (TCL) and depositioning of the Cr-Au electrode pad [13]. After the chip fabrication process, a Si mold and spin-on-glass (SOG) were used to fabricate a one-dimensional (1D) grating structure on the top of the TCL.…”

Section: Imprinting and Chip Processmentioning

confidence: 99%

Demonstration of a simplified optical mouse lighting module by integrating the non-Lambertian LED chip and the free-form surface

Pan

2012

Appl. Opt.

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A cost-effective, high-throughput, and high-yield method for the efficiency enhancement of an optical mouse lighting module is proposed. We integrated imprinting technology and free-form surface design to obtain a lighting module with high illumination efficiency and uniform intensity distribution. The imprinting technique can increase the light extraction efficiency and modulate the intensity distribution of light-emitting diodes. A modulated light source was utilized to add a compact free-form surface element to create a lighting module with 95% uniformity and 80% optical efficiency.

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Novel exposure system using light-emitting diodes and an optical fiber array for printing serial numbers and code marks

Iwasaki

Horiuchi

2012

Review of Scientific Instruments

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Feasibility of a novel exposure system to print serial numbers and two-dimensional code marks was demonstrated. The new system used light-emitting diodes (LEDs) combined with an optical fiber matrix array as a light source. At first, as preparatory experiments, code mark patterns were printed using a prototype exposure system without using the optical fiber array but using the combination of arrayed LEDs with a central wavelength of 428 nm, spherical lenses, and rod lenses. Although the code mark patterns were successfully printed, it took too much exposure time. For this reason, bullet-type LEDs with a high power and a shorter wavelength of 405 nm were used and the optical fiber matrix array was adopted. Because the emitted light rays were efficiently taken into the fiber, and the resist sensitivity was improved, practically available short exposure time of less than 2 s was obtained.

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Functional imprinting structures on GaN-based light-emitting diodes for light pattern modulation and light extraction efficiency enhancement

Cited by 5 publications

References 18 publications

Readability dependence on lithography conditions for printing code marks using a squared optical fiber matrix and light-emitting diodes

Readability dependence on lithography conditions for printing code marks using a squared optical fiber matrix and light-emitting diodes

Demonstration of a simplified optical mouse lighting module by integrating the non-Lambertian LED chip and the free-form surface

Novel exposure system using light-emitting diodes and an optical fiber array for printing serial numbers and code marks

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