Patent ID: 7412088

Claim:
A method of inspecting a display panel comprising a substrate, a plurality of spaced apart, parallel partition walls provided on the substrate and fluorescent layers formed by applying a phosphor in each groove formed between the partition walls, with a combination of an illuminator and an imaging device, the method comprising the steps of: moving relatively the substrate and the combination of illuminator and imaging device in a direction across the grooves; illuminating the grooves in sequence with light emitted from the illuminator and receiving a light emitted, based on the illuminating, from the grooves in sequence by the imaging device, during movement of the substrate or the combination of illuminator and imaging device; measuring bright and dark signals of the light received by the imaging device; and measuring volume of the phosphor applied in the grooves based on the obtained signals, wherein an ejection port of the illuminating device for emitting light is formed with a slit, and wherein the width of the slit is in the range of 0.3 mm to 10 mm, and the length of the slit is in the range of 10 mm to 1000 mm.