Young-Chan Kim
Samsung
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Publication
Featured researches published by Young-Chan Kim.
international solid-state circuits conference | 2014
Jung-Chak Ahn; Kyung-Ho Lee; Yi-tae Kim; Hee-Geun Jeong; Bum-Suk Kim; Hong-ki Kim; Jong-Eun Park; Taesub Jung; Won-Je Park; Taeheon Lee; Eun-Kyung Park; Sangjun Choi; Gyehun Choi; Haeyong Park; Yujung Choi; Seungwook Lee; Yun-kyung Kim; Y. Jay Jung; D.I. Park; Seungjoo Nah; Young-Sun Oh; Mi-Hye Kim; Yooseung Lee; Youngwoo Chung; Ihara Hisanori; Joonhyuk Im; Daniel K. J. Lee; Byung-hyun Yim; Gidoo Lee; Heesang Kown
According to the trend towards high-resolution CMOS image sensors, pixel sizes are continuously shrinking, towards and below 1.0μm, and sizes are now reaching a technological limit to meet required SNR performance [1-2]. SNR at low-light conditions, which is a key performance metric, is determined by the sensitivity and crosstalk in pixels. To improve sensitivity, pixel technology has migrated from frontside illumination (FSI) to backside illumiation (BSI) as pixel size shrinks down. In BSI technology, it is very difficult to further increase the sensitivity in a pixel of near-1.0μm size because there are no structural obstacles for incident light from micro-lens to photodiode. Therefore the only way to improve low-light SNR is to reduce crosstalk, which makes the non-diagonal elements of the color-correction matrix (CCM) close to zero and thus reduces color noise [3]. The best way to improve crosstalk is to introduce a complete physical isolation between neighboring pixels, e.g., using deep-trench isolation (DTI). So far, a few attempts using DTI have been made to suppress silicon crosstalk. A backside DTI in as small as 1.12μm-pixel, which is formed in the BSI process, is reported in [4], but it is just an intermediate step in the DTI-related technology because it cannot completely prevent silicon crosstalk, especially for long wavelengths of light. On the other hand, front-side DTIs for FSI pixels [5] and BSI pixels [6] are reported. In [5], however, DTI is present not only along the periphery of each pixel, but also invades into the pixel so that it is inefficient in terms of gathering incident light and providing sufficient amount of photodiode area. In [6], the pixel size is as large as 2.0μm and it is hard to scale down with this technology for near 1.0μm pitch because DTI width imposes a critical limit on the sufficient amount of photodiode area for full-well capacity. Thus, a new technological advance is necessary to realize the ideal front DTI in a small size pixel near 1.0μm.
SID Symposium Digest of Technical Papers | 2011
Young-Chan Kim; Hyundeok Im; Moon-gyu Lee; Hwan-young Choi
In this paper, we suggest an elegant and cost-effective Backlight Unit which is slim and has locally confined light needed for 1-dimensional local dimming and scanning. We fabricated LGP with micro-structures patterned by CO2 Laser. Lights from LGP are well distributed and uniform with density control of micro-patterns because they are continuous over the whole region of LGP. With one dimensional local dimming, we obtained 43% power-saving effect and contrast ratio of 11400:1 without any hot spot and the artifact.
SID Symposium Digest of Technical Papers | 2007
Seong-Mo Hwang; Yeun-Tae Kim; Young-Chan Kim; Seung-ho Nam; Sin-Doo Lee
We have developed a highly efficient backlight unit (BLU) with a polarization-separating anisotropic layer on which asymmetric microstructures were embossed. Our BLU provides the polarized light along the direction normal to the anisotropic layer and has over 30% higher luminance than a BLU adopting a reflective polarizer.
Molecular Crystals and Liquid Crystals | 2009
Seongmo Hwang; Young-Chan Kim; Yeun-Tae Kim; Seung-ho Nam; Sin-Doo Lee
We developed a highly efficient lightguide plate (LGP) using an anisotropic layer (AL) with polarization-separating microstructures. The microstructures were fabricated on a uniaxially stretched polymeric AL through a hot embossing process. Our LGP with asymmetric saw-tooth bistructures produces highly efficient polarized light along the direction normal to the AL by reducing the stray light propagating at large inclination angles. The backlight unit (BLU) with a newly designed LGP has about 30% higher luminance and integrated intensity than the conventional BLU with a reflective polarizer.
Archive | 2001
Young-Chan Kim
Archive | 2002
Young-Chan Kim
Archive | 2007
Sung-Ho Choi; Jung-Chak Ahn; Yi-tae Kim; Young-Chan Kim; Hae-Kyung Kong
Archive | 2006
Heung-Jun Park; Young-Chan Kim
Archive | 2006
Young-Chan Kim; Yi-tae Kim
Archive | 2000
Young-Chan Kim