Liquid crystal display and driving apparatus thereof

A liquid crystal display comprising:

• a signal controller comprising a logic circuit and a multilevel graying unit, the logic circuit classifying n-bit source image data into at least two sections by dividing grays and correcting the n-bit source image data into m-bit first corrected data based on gamma correction data predetermined by gamma characteristics of the n-bit source image data for each of the at least two sections, the multilevel graying unit converting the m-bit first corrected data into second corrected data with a bit number equal to or less than the n bits of the source image data;
• a memory storing a parameter for correcting the n-bit source image data into the m-bit first corrected data;
• and
• a data driver outputting data voltages corresponding to the second corrected data from the signal controller;
• wherein the logic circuit calculates correction values in a first section and a second section differentiated by a boundary value based on the following:
• MD
• 1
• -
• MD
• 1
• ×
• {
• (
• D
• -
• BB
• )
• UN
• }
• UO
• ;
• ⁢
• and
• MD
• 2
• -
• MD
• 2
• ×
• {
• (
• BB
• -
• D
• )
• DN
• }
• DO
• ,
• respectively,
• where D is the n-bit source image data, BB is the boundary value, UN and DN are respective sizes of the first and the second sections, UO and DO are orders of respective polynomials in the first and the second sections, and MD1 and MD2 are the maximum values of differences between the n-bit source image data and the gamma correction data for the first and the second sections.

A driving apparatus of a liquid crystal display, comprising:

• a logic circuit classifying n-bit image data inputted from an external device into first and second sections with respect to a boundary gray value and correcting the n-bit image data into m-bit corrected data based on gamma correction data predetermined by gamma characteristics of the n-bit image data for each of the first and the second sections;
• and
• a storage storing operation parameters of the logic circuit,
• wherein the logic circuit calculates correction values in the first section and the second section based on the following:
• MD
• 1
• -
• MD
• 1
• ×
• {
• (
• D
• -
• BB
• )
• UN
• }
• UO
• ;
• ⁢
• and
• MD
• 2
• -
• MD
• 2
• ×
• {
• (
• BB
• -
• D
• )
• DN
• }
• DO
• ,
• respectively,
• where D is the n-bit image data, BB is the boundary gray value, UN and DN are respective sizes of the first and the second sections, UO and DO are orders of respective polynomials in the first and the second sections, and MD1 and MID2 are the maximum values of differences between the n-bit image data and the gamma correction data for the first and the second sections.

A driving apparatus of a liquid crystal display, comprising:

• a logic circuit classifying n-bit image data into a plurality of sections on the basis of given number of grays and correcting the n-bit image data into m-bit corrected data based on gamma correction data predetermined by gamma characteristics of the n-bit image data for each of the sections;
• and
• a storage storing the gamma correction data at boundary gray values of each of the sections,
• wherein the logic circuit converts the n-bit image data into the m-bit corrected data for each of the sections;
• and
• wherein the m-bit correction data is determined by a linear line defined by the boundary gray values for each of the sections as determined by:
• Y
• min
• +
• (
• Y
• max
• -
• Y
• min
• )
• (
• X
• max
• -
• X
• min
• )
• ⁢
• (
• X
• -
• X
• min
• )
• where Xmin and Xmax are minimum and maximum boundary gray values of each of the sections, Ymin and Ymax are the gamma correction data for Xmin and Xmax, and X is the n-bit image data.