Patent ID: 9640103
Date: 2017-05-02
CPC Classifications: G09G

Claim:
1. An apparatus for converting data in a display apparatus including a plurality of unit pixels, each unit pixel with red, green, blue and white sub-pixels, the apparatus comprising: a 4-color data generator for generating 4-color data of red, green, blue and white colors for each unit pixel based on a 3-color input data of red, green and blue colors of an input image; a sharpness gain value generator for calculating a sharpness gain value for the input image based on an edge intensity for each unit pixel in accordance with the 3-color data of each unit pixel; and a sharpness enhancer for enhancing sharpness of the input image by correcting white sub-pixel data of a unit pixel of the plurality of unit pixels, the unit pixel corresponding to an edge portion of the input image, by a luminance variation of adjacent unit pixels based on the white sub-pixel data for each unit pixel and the sharpness gain value, wherein the sharpness gain value generator calculates an edge distribution index by multiplying a ratio of a number of unit pixels whose edge intensity is more than a reference weak edge intensity and a number of unit pixels whose edge intensity is more than a minimum edge intensity and less than the reference weak edge intensity, and a rate of a number of unit pixels whose energy intensity is more than a reference edge intensity in a total number of unit pixels, and calculates the sharpness gain value in accordance with the calculated edge distribution index.