Patent ID: 8223333
Filing Date: 2012-07-17
Classification: G01N,G02F

Abstract:
1. A liquid crystal display (LCD) device testing apparatus comprising: a stage configured in an air-floating structure to feed a liquid crystal panel including combined upper and lower substrates; a backlight unit configured to include a light source for an emission of light disposed under the stage, a protective film formed to encompass and protect the light source, and a lower polarizing plate formed on the protective film to firstly polarize light emitted from the light source in a fixed axis direction; an upper polarizing plate separated from the upper surface of the liquid crystal panel by a fixed distance to secondarily polarize light from the liquid crystal panel in the fixed axis direction; and a charge couple device (CCD) camera disposed on the upper polarizing plate to scan an image on the liquid crystal panel using light secondarily polarized by the upper polarizing plate, wherein the lower polarizing plate is configured to include first to fourth polarizing plates of different characteristics which are disposed on the upper, rear, left, and right surface of the protective film, wherein the first and second polarizing plates each provided to the upper and rear surfaces of the protective film are used in the liquid crystal panel of an in-plane switching mode, wherein the third and fourth polarizing plates each provided to the left and right side surfaces of the protective film are used in the liquid crystal panel of a twisted nematic mode, wherein the protective film is rotated according to a mode of the liquid crystal panel.