Patent ID: 7190409
Filing Date: 2007-03-13
Classification: G09G,H04N

Abstract:
1. A method of driving a display device comprising: providing a first image signal to display a boundary image wherein a level of the image signal decreases from a first point to a second point in the vicinity of a point corresponding to the boundary image; detecting a maximal absolute value of gradients of the first image signal between the first point and the second point; comparing said maximal absolute value of gradients with a predetermined threshold value; and forming a second image signal based on said first image signal wherein a level of the second image signal increases from the first point to a third point, decreases from the third point to a fourth point and increases from the fourth point to the second point when said maximal absolute value of gradients is larger than said predetermined threshold value, wherein said third point is located between the first and second points and said fourth point is located between the third and second points.