APPEARANCE INSPECTION OF LCD SURFACE

摘要

A device for inspecting a substrate is provided to use a lamp efficiently and reduce an exchange cost of a lamp efficiently by exactly detecting a lamp exchange time of a lighting unit. A detector of a substrate includes a substrate(S), a substrate frame(130), a lighting unit, and a inspecting unit(138). The substrate frame(130) is adhered to support the substrate(S). The lighting unit has an optical source which illuminates a light on the substrate(S) which is supported by the substrate frame(130). The inspecting unit(138) is fixed on a position of the substrate frame(130) which is opposite to the lighting unit, and predicts an optical source life span of the lighting unit. The inspecting unit(138) is an illuminating sensor which detects an illumination of the optical source. The control unit determines an exchange time of the optical source by receiving an output signal of the inspecting unit(138).