Patent Document ID: 7889358
Application ID: 12226681
Patent Status: 1

Claim One:
1. A method for inspecting, for unevenness, a color filter in which each pixel is surrounded by a black matrix, the method comprising: an illuminating step of illuminating a color filter edge at an angle of incidence inclined at not less than 0 degree to less than (90+α) degrees to a line normal to that principal surface of a substrate on which the color filter has been formed or at an angle of incidence inclined at not less than 0 degree to less than (90−α) degrees to the line normal to the principal surface of the substrate, the color filer edge containing a boundary between the pixel and the black matrix, α being an average degree of inclination of the color filter edge that is not less than 0 degree to less than 90 degrees; an imaging step of taking at least two images of light reflected by the color filter edge at an angle of reflection, different from the angle of incidence, which is not less than 0 degree to less than (90−α) degrees when the angle of incidence is not less than 0 degree to less than (90+α) degrees or is not less than 0 degree to less than (90+α) degrees when the angle of incidence is not less than 0 degree to less than (90−α) degrees; a shot-image information analyzing step of calculating a difference in luminance within the color filter in accordance with the images thus taken; and an unevenness determining step of determining the existence of unevenness of the color filter from the difference in luminance.