Samsung Electronics Co., Ltd.

Kang Woong Ko

Hyun Cheol Oh

Dae Jung Kim

Dong Woo Paeng

Sung Ho Jang

Sung Yoon Ryu

Jae Hyung Ahn

Kyoung Hwan Lee

Dong Eog Kim

Chul Hyung Yoo

Yong Ju Jeon

Hyo Hyeong Kang

Gil Woo Song

Hyoung Jo Jeon

Jong Han Oh

A method for measuring a semiconductor device is provided. A method for measuring a semiconductor device includes defining an interest area and an acceptable area in a chip area on a wafer; performing a first measurement of the chip area with a spectral imaging device to acquire spectrum data of the chip area; assuming the distribution of the spectrum data of a first pixel in the acceptable area is a normal distribution; calculating a distance from a central point on the normal distribution to second pixels in the interest area; selecting a position of a second pixel having a distance from the central point on the normal distribution greater than a predetermined range, among the second pixels, as a candidate position; and performing a second measurement of the candidate position.

Method for measuring semiconductor device

In an embodiment of the apparatus, a transparent inkjet head includes a first plurality of nozzles, and a color inkjet head includes a second plurality of nozzles. A color value measurement unit is configured to measure color values of ink applied to a plurality of pixels based on signals applied to the second plurality of nozzles of the color inkjet head and signals applied to the first plurality of nozzles of the transparent inkjet head. A control unit is configured to compare the measured color values of the ink applied to the plurality of pixels with a target value and to change the signals applied to the first plurality of nozzles of the transparent inkjet head such that the measured color values of the ink applied to the plurality of pixels are uniform.

Ink discharge apparatus and method of controlling the same

According to an example embodiment, an inkjet head cleaning apparatus that removes ink residue from an inkjet head after a purging operation in a non-contact manner includes a cleaning blade and a drive unit. The cleaning blade is at a distance from a bottom of the inkjet head. The drive unit is configured to move the cleaning blade in a direction parallel to the inkjet head bottom. The cleaning blade includes a flat upper surface parallel to the inkjet head bottom, and an ink film is produced between the flat upper surface of the cleaning blade and the inkjet head bottom. The cleaning blade also includes an elongated groove longitudinally in the upper surface of the cleaning blade.

Inkjet head cleaning apparatus and method

Example embodiments are directed to an ink discharge device that discharges uniform amounts of ink droplets from an inkjet head, and a control method thereof. Voltages applied to plural nozzles of the ink-head are changed based on different characteristics of the respective nozzles to discharge uniform amounts of ink droplets from the nozzles. Voltage increments are calculated using a fixed target color value so as to set color value dispersion and voltage increments are calculated using different target color values according to the nozzles so as to satisfy color value differences between the neighboring pixels and thus time required for a DPN process is shortened, and excessive changes of the applied voltages are prevented and thus a preparatory period required to mass-produce an LCD panel is shortened and yield of the LCD panel is increased.

Ink discharge device of inkjet head and control method thereof

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Seoul, South Korea

Kang Woong Ko