Samsung Display Co., Ltd.

Korea Advanced Institute of Science and Technology

Gs Caltex Corporation

Ji-Su Choi

Gyu-Hyeong Cho

Ohjo Kwon

Ki-Duk Kim

Sang-Hee Park

Young-Se Oh

Ki-Ung Kim

Sang-Wook Park

A digital-to-analog converter having a structure that converter may decrease an effect of a mismatch between elements and decrease a quantity of the elements. The digital-to-analog converter includes a multiplexer configured to output a first voltage or a second voltage corresponding to an input bit as an input voltage and a recursive switched circuit configured to alternately receive the input voltage and a reference voltage and to output an average value of the input voltage and the reference voltage as an output voltage.

Digital-to-analog converter and driving circuit of display device having the same

A method for preparing a pitch for carbon fibers and a pitch for carbon fibers prepared by the same are disclosed. The method includes introducing a peroxide compound and ozone into a petroleum-process residual oil, followed by heat treatment for reaction. By the method, the pitch for carbon fibers, which exhibits excellent oxidative stabilization and oxidative incompatibility while having a high softening point and high strength, can be obtained at high yield at a relatively low temperature.

Method for preparing a pitch for carbon fibers and a pitch for carbon fibers prepared by the same

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Daejeon, South Korea

Ji-Su Choi