Driving device of liquid crystal device and driving method thereof

A liquid crystal display driving device, comprising:

• a gate driver integrated circuit for supplying a scan signal to a plurality of gate lines;
• a data driver integrated circuit for supplying image information to a plurality of data lines;
• a first gamma voltage generator for supplying a first gamma voltage to the data driver integrated circuit when the liquid crystal display is driven according to a general driving mode, for generating an image having a first luminance value in a first predetermined pixel;
• and
• a second gamma voltage generator for generating an image having a plurality of second luminance values in a plurality of predetermined pixels corresponding to the first predetermined pixel when the liquid crystal display is driven according to a halftone gray driving mode and for supplying a plurality of gamma voltages to the data driver integrated circuit, wherein an average of the second luminance values is substantially the equal to the first luminance value.

A driving device, comprising:

• a timing controller for transmitting a control signal indicating that a display device having a data driver be driven according to a general driving mode or a halftone driving mode;
• a gamma voltage generator connected to the timing controller, the gamma voltage generator including a first gamma voltage generator for supplying a first gamma voltage type to the data driver according to the general driving mode and a second gamma voltage generator for supplying a second gamma voltage type to the data driver according to the halftone driving mode, wherein the halftone driving mode expresses a grayscale level using at least two different gamma voltages of the second gamma voltage type;
• and
• a switching unit connected to the timing controller and the gamma voltage generator for outputting one of the first and second gamma voltage types based on the control signal, wherein pixels receiving the first gamma voltage type are equivalently expressed as a pixel groups receiving the second gamma voltage type.

A method of driving a liquid crystal display device, comprising:

• determining whether a liquid crystal display device is driven according to a general driving mode or a halftone gray driving mode;
• supplying a first gamma voltage to a first pixel of the liquid crystal display device driven according to the general driving mode, wherein light is transmitted by the first pixel at a first luminance value;
• and
• supplying a plurality of gamma voltages to a plurality of pixels of the liquid crystal display device driven according to the halftone gray driving mode, wherein the plurality of pixels correspond to the first pixel, wherein an average luminance value by which light is transmitted by the plurality of pixels is substantially equal to the first luminance value.

A driving method for a display device, comprising:

• receiving a control signal;
• generating one of a first gamma voltage type for a general driving mode and a second gamma voltage type for a halftone driving mode based on the received control signal, wherein the halftone driving mode expresses a grayscale level using at least two different gamma voltages of the second gamma voltage type;
• and
• outputting either the first gamma voltage type or the second gamma voltage type to the display device based on the received control signal, wherein pixels receiving the first gamma voltage type are equivalently expressed as pixels receiving the second gamma voltage type.