LIQUID CRYSTAL DISPLAY, ESTIMATING METHOD OF EXTERNAL LIGHT, AND DRIVING METHOD OF THE LIQUID CRYSTAL DISPLAY

摘要

PURPOSE: A liquid crystal display, an estimating method of an external light and driving are provided to improve display quality by controlling luminance of a back light unit with corresponding to the luminance of the external light. CONSTITUTION: A first electrode and a second electrode form an electric field. The arrangement of a liquid crystal molecule(150) is changed by the electric field. An optical detecting device(910) senses the light passing through liquid crystal molecules. The optical detection device detects a first light in the first arrangement of the liquid crystal molecules. The optical detection device detects a second light in the second arrangement of the liquid crystal molecules. An optical measuring unit measures the luminance of the external light from the difference of the first and the second light.