Samsung Electronics Co., Ltd.

Hewlett-packard Development Company, L.p.

Hp Printing Korea Co., Ltd.

Kyoung-sik Park

Eun-bong Han

Young-jin Park

An image forming apparatus includes a transport part which includes a transport belt to transport a printing medium, an image forming part which transfers a toner to form a color image, and a controller which controls the image forming part to form a test image for color registration of the image forming part on the transport belt while an image is formed for a plurality of printing media. Thus, both a test image and a plurality of printed media are formed during a single printing process.

Image forming apparatus and control method thereof

An image forming apparatus comprises a plurality of data output parts for outputting printing data corresponding to a plurality of colors in synchronization with a reference clock signal. A clock control part controls the reference clock signal to be input to the data output parts, respectively. A control part outputs an initial clock signal forming the basis of the reference clock signal and initial data forming the basis of the printing data to the data output parts, and controls the clock control part to output the reference clock signal to the data output parts when the initial data corresponding to the colors corresponding to the data output parts are output to the data output parts. Accordingly, an image forming apparatus which is capable of reducing power wastefully consumed in a data output part and a control method thereof are provided.

An image processing apparatus includes an inputting unit to receive image data having pixel data, an image processing unit to align and output the pixel data, and a control unit to prevent the pixel data from being transmitted to the image processing unit when the pixel data have null data.

Image processing apparatus and image processing method

A head driving device, an inkjet printer comprising the same and data processing method of an ink jet printer are provided, in which a nozzle driving unit turns on/off a plurality of thermal elements that correspond to a plurality of nozzles and heat ink discharged from the nozzles, a data processing unit processes printing data and outputs a nozzle select signal corresponding to an image to the nozzle driving unit; and a head logic unit receives the printing data externally, divides the printing data of one address group into a plurality of data groups, transmits the plurality of data groups to the data processing unit via different data buses corresponding to the plurality of data groups, respectively, and controls the data processing unit to process the divided printing data. Accordingly, an EMI characteristic between signals can be improved by lowering the data buses density in one area, and a data processing speed can be adjusted by dividedly processing printing data.

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Seoul, South Korea

Kyoung-sik Park