Liquid crystal display, driving apparatus, digital-analog converter and output voltage a

A driving device of a liquid crystal display (LCD), comprising:

• 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, wherein
• the data driver includes:
• a voltage generator for selecting a first gray voltage and a second gray voltage corresponding to bit values of (m−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, where
• m is a natural number equal to or greater than 3, and k is a natural number less than (m−2).

A liquid crystal display (LCD) comprising:

• a liquid crystal display panel including a plurality of scan lines for transmitting a plurality of scan signals, a plurality of data lines for transmitting a plurality of data signals, and a plurality of pixels defined by the plurality of scan lines and the plurality of data lines;
• a reference gray voltage generator for generating a plurality of reference gray voltages;
• and
• a data driver for applying the plurality of data signals to the plurality of pixels, the data signals corresponding to a third gray voltage that is generated in correspondence to bit values of n bits from among the plurality of data signals or the video signal generated by combining 2k voltages that correspond to bit values of (m−k) bits from among m-bit video signals applied from the outside based on the plurality of reference gray voltages and are determined to be one of a first gray voltage and a second gray voltage, wherein
• the data driver includes a digital to analog (D/A) converter for generating the first and second gray voltages or generating the third gray voltage by selecting two voltages from among fourth to sixth gray voltages that are generated corresponding to bit values of bits less than (m−k−2) bits from among the (m−k) bits, where m is a natural number equal to or greater than 3, k is a natural number less than m−2, and n is a natural number greater than or equal to 2 and less than m.

A driving device of a liquid crystal display (LCD) comprising:

• 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, wherein
• the data driver includes:
• a voltage generator for selecting a first gray voltage and a second gray voltage corresponding to bit values of (m−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;
• at least one decoder for generating a third gray voltage corresponding to bit values of at least 2 bits from among the video signal;
• and
• an output voltage amplifier for generating the data signal by combining the 2k voltages, or generating the data signal corresponding to the third gray voltage, and applying the data signal to a plurality of pixels, where m is a natural number equal to or greater than 3, and k is a natural number less than (m−2).

An output voltage amplifying circuit for receiving a gray voltage corresponding to a video signal, generating a data signal corresponding to the gray voltage, and applying the same to a pixel of a liquid crystal display (LCD), the output voltage amplifying circuit comprising:

• a plurality of first switches turned on/off by a gray voltage corresponding to the video signal;
• a plurality of second switches turned on/off by the data signal, and respectively having one terminal, the one terminal of the second switch and a corresponding one terminal of the first switch sharing a node;
• a plurality of current sources coupled between a plurality of the nodes and a first power source for supplying a first voltage;
• and
• an output terminal coupled to other terminals of the plurality of second switches, and outputting the data signal that is generated by combining the plurality of gray voltages to the pixel.