Patent ID: 7728616

Claim:
An apparatus for testing a picture quality, the apparatus comprising: a liquid crystal display which displays a test pattern; an image pickup device which photographs the test pattern of the liquid crystal display and obtains an analog voltage value of the test pattern; an analog-to-digital converter which receives the analog voltage value from the image pickup device and converts the analog voltage value from the image pickup device into a digital value; a measurer which measures a transmittance of the test pattern photographed by the image pickup device by receiving the digital value from the analog-to-digital converter and analyzing the test pattern of the digital value; a rotating means for rotating at least one of the liquid crystal display and the image pickup device while the image pickup device photographs the test pattern; and a guide part about which the at least one of the liquid crystal display and the image pickup device rotate while the image pickup device photographs the test pattern, wherein the measurer measures a viewing angle at which gray inversion of the test pattern occurs, based on the digital value, the guide part has a shape of at least a portion of a circle, and at least one of the liquid crystal display and the image pickup device rotates by moving along the guide part.