Method and apparatus for color thickness testing

摘要

The whole output of a screen is unified into one color tone by a monochromatic mask 4 set between a white light source 1 and a color filter 2 to mask picture elements other than those with a specific color tone. The light emitted from the screen is filtered by a filter having a wavelength lambda 1 displaced by a predetermined wavelength DELTA lambda from the central wavelength lambda 0 of the one color tone. The intensity of the filtered light is detected for each position on the screen using a photodetector 6 and an image processor 7 is used to assess the intensity of the light detected for each position on the screen. The image processor allows the thickness uniformity (or otherwise) of the color filter to be determined by an objective method, quantitatively and accurately at a high sensitivity.