Compensation table generating system, display apparatus having brightness compensation table, and method of generating compensation table

A display apparatus comprising:

• a display panel which displays an image corresponding to an image signal;
• a brightness compensation table which stores a representative position information corresponding to a stain area, in which a stain appears, on the display panel and compensation data corresponding to positions in the stain area;
• and
• a display panel driver which receives the image signal, compensates for a portion of the image signal corresponding to the stain area based on the brightness compensation table to generate a compensation signal, applies the compensation signal to the stain area of the display panel, and applies a remaining portion of the image signal to a remaining area, except for the stain area, of the display panel,
• wherein the representative position information comprises a portion of the position information of the stain area on the display panel, and
• wherein the representative position information comprises:
• a coordinate value of a start point of the stain area;
• and
• a coordinate value of an end point of the stain area, and
• where in the stain area is divided into a first sub area and a second sub area with reference to a predetermined reference line when the brightness distribution of the first sub area and the brightness distribution of the second sub area are symmetric to each other with respect to the reference line, and
• a second storing area stores the compensation data corresponding to the first sub area or the second sub area.

A method of generating a compensation table, the method comprising:

• applying a test signal corresponding to a plurality of predetermined reference gray scales to a display panel;
• obtaining a test image of each of the plurality of reference gray scales displayed on the display panel;
• measuring a brightness distribution of each of the plurality of reference gray scales based on the obtained test image, and extracting a representative position information of a stain area, in which a stain appears, based on the brightness distribution of each of the plurality of reference gray scale;
• calculating a compensation data corresponding to a position in the stain area;
• and
• storing the representative position information and the compensation data to generate a brightness compensation table,
• wherein the extracting the representative position information comprises:
• extracting a stain information including a size information of the stain area and a shape information of the stain area;
• and
• extracting the representative position information including a coordinate value of a start point and a coordinate value of an end point of the stain area based on the stain information, and
• wherein the calculating the compensation data comprises:
• determining whether the stain area includes a first sub area and a second sub area, which have brightness distributions symmetric to each other with respect to a predetermined reference line;
• and
• calculating the compensation data corresponding to one of the first sub area and the second sub area when the brightness distribution of the first sub area and the brightness distribution of the second sub area are symmetric to each other with respect to the predetermined reference line.