Patent ID: 7924417

Claim:
A measuring apparatus for measuring luminance of a back-light source module, the back-light source module comprising a light guide plate and a light source coupled to the light guide plate, the light guide plate comprising a light output surface and a bottom surface opposite to the light output surface, the measuring apparatus comprising: a base; a table slidably mounted on the base, the table defining a first elongated slot, the first elongated slot configured for exposing a central portion of the bottom surface of the light guide plate arranged on the table, and allowing light from the light guide plate to pass therethrough; a light blocking piece for attachment to the central portion of the bottom surface of the light guide plate and being exposed to the first elongated slot; a sensor arranged on the base for sensing light passing through the first elongated slot and generating a sensing signal associated therewith; a luminance meter configured for facing the light output surface of the light guide plate and measuring luminance of the back-light source module when the luminance meter aligns with the central portion of the bottom surface; a drive assembly for moving the table to align the light blocking piece with the sensor; and a controller configured for switching off the drive assembly when the light is blocked by the light blocking piece from reaching the sensor.