Patent ID: 7808625

Claim:
A color filter evaluation process performed by projecting light of a measurement light source on a pixel of a color filter as a sample and receiving light from the sample for optical measurement thereof, comprising the steps of: (a) preparing a transparent plate including one pixel formed with a frame as a reference, wherein the one pixel is a range covered by a color filter of one color; (b) adjusting a size of a light transparent section by a variable aperture unit including the light transparent section whose size is variable so that a profile of an irradiation spot of the measurement light source includes the entire area of the pixel; (c) measuring an intensity R of light of the reference with the measurement light source being illuminated; (d) preparing a color filter including one pixel formed with a frame as a sample; (e) adjusting the size of the light transparent section by the variable aperture unit so that a profile of an irradiation spot of the measurement light source includes the entire area of the pixel; (f) measuring an intensity S of light of the sample with the measurement light source being illuminated; and (g) calculating a ratio R/S, thereby determining a transmittance of the sample.