Korea Advanced Institute of Science and Technology

Hyundai Motor Company

Kia Motors Corporation

Korea Minting, Security Printing Id Card Operating Corp

Gun Ho Lee

Hyun Soo Kim

Yong-Joon Jeon

Gyu Hyeong Cho

Sang Hoon Han

Young-Suk Son

Sang Kyung Kim

Won Gyun Choe

Hong Keon Kim

E Den Kim

Soo Dong Kim

Jin Yong Jeon

Shin Hyun Kim

Shin-hyun Kim

Ju Hee Kang

Chan Ul Jeong

Su Dong Kim

Jong Bin Kim

A photonic crystal film, a method for manufacturing the photonic crystal film, and an anti-forgery article comprising the photonic crystal film are disclosed. The photonic crystal film includes a polyurethane-based polymer matrix and colloidal particles dispersed in the polyurethane-based polymer matrix and arranged in a crystal lattice structure. The colloidal particles includes one or more selected from metal nanoparticles, metal oxide nanoparticles, organic nanoparticles, and carbon structure nanoparticles.

Photonic crystal film, method for manufacturing same, and anti-forgery article comprising same

Disclosed are an ink composition including light-absorbing nanoparticles and a photonic crystal structure formed using the same. The ink composition may include inorganic particles; monomer; photoinitiator; and nanoparticles light-absorbing nanoparticles to provide the photonic crystal structure. As consequence, problems such as low color sharpness, which makes photonic crystals visible, and attaining high productivity may be eliminated. Moreover, white scattering can be reduced, and thus a distinctive color can be exhibited even when there is a difference between a reflection angle and an observation angle of light, thereby improving visibility.

Photonic crystal ink composition comprising light-absorbing nanoparticles and photonic crystal structure formed using the same

A digital-to-analog converter comprises a current supplier, a current divider dividing current supplied from the current supplier into certain amounts, an inverter outputting inverted signals of input signals and non-inverted signals, a switch controlling a flow of the current divided into the certain amounts by the current divider according to the inverted signals and the non-inverted signals, and a current output block adding up the current divided into the certain amounts according to the non-inverted signals to output an analog signal. The digital-to-analog converter can be implemented on a small chip area with desired resolution.

High resolution digital-to-analog converter

Growing community of inventors

Daejeon, South Korea

Gun Ho Lee