Mc Technology Co., Ltd.

Hee-Jong Park

Sang-Hoon Lee

Byung-Doo Kim

Ju-Young No

An amplifying circuit of a display device including a plurality of pixels includes an input unit, a bias unit, and an output unit. The input unit is coupled between a first power source for supplying a first voltage and a second power source for supplying a second voltage, receives a first input signal and a second input signal, and is controlled by the first and second input signals. The bias unit receives a bias voltage for operating the input unit, and includes a first node and a second node controllable by the input unit. The output unit applies an output voltage to a pixel by using a first output transistor turned on/off by a signal applied to the first node and a second output transistor turned on/off by a signal applied to the second node, and the first output transistor is a different type to the second output transistor. In this instance, the input unit includes a first input transistor having a first terminal coupled to a first power source and being turned on/off by a first input signal and a second input transistor of the same type as the first input transistor, having a first terminal coupled to the first power source, and being turned on/off by a second input signal. The bias unit includes a first transistor controllable by the on/off state of the first input transistor and a second transistor controllable by the on/off state of the second input transistor.

Voltage amplifier and driving device of display device using the voltage amplifier

The present invention relates to a liquid crystal display, a driving device thereof, a digital to analog converter, and an output voltage amplifying circuit. The present invention provides a liquid crystal display driving device including a reference gray voltage generator for generating a plurality of reference gray voltages, and a data driver for generating a plurality of gray voltages based on the plurality of reference gray voltages and applying a data signal that is generated by selecting a gray voltage corresponding to m-bit video signals applied from the outside from among the plurality of gray voltages to the pixel The data driver includes: a voltage generator for selecting a first gray voltage and a second gray voltage corresponding to bit values of (m&#x2212;k) bits from among the video signal from among the plurality of gray voltages, and outputting the first and second gray voltages; an output voltage generator for outputting 2k voltages determined as one of the first and second gray voltages corresponding to bit values of k bits from among the video signal; and an output voltage amplifier for generating the data signal by combining the 2k voltages, and applying the data signal to a plurality of pixels. According to the present invention, a liquid crystal display having a small cost and area can be realized.

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Yongin-si, South Korea

Hee-Jong Park