Patent ID: 9613563
Date: 2017-04-04
CPC Classifications: G09G

Claim:
1. A display apparatus comprising: a display panel configured to display an image frame; an arithmetic operator configured to divide the image frame into pixel blocks, calculate pixel gradation values of the pixel blocks, and accumulate the calculated pixel gradation values, for a number of image frames displayed in succession or a time period; and a compensator configured to locally reduce a luminance of a corresponding pixel block, of which a respective accumulated pixel gradation value exceeds a certain threshold value of the pixel blocks, and to compensate for a luminance difference between the corresponding pixel block, for which the luminance has been reduced, and surrounding pixel blocks which are disposed in a vicinity of the corresponding pixel block, wherein the compensator comprises: a gain calculator configured to calculate a gain value; a first compensation gain calculator configured to calculate a first compensation gain value for compensating for the luminance difference between the pixel blocks, by applying an edge smoothing filter to the calculated gain value; a second compensation gain calculator configured to calculate a second compensation gain value for removing a flicker due to a temporal luminance change of the pixel blocks by applying an Infinite Impulse Response (IIR) filter to the first compensation gain value; and a pixel adjuster configured to calculate a pixel gain value for each pixel of the pixel blocks based on the second compensation gain value, reflect the calculated pixel gain value to the gradation value of each pixel, and provide the gradation value of the pixel to the display panel.