DISPLAY DEVICE

摘要

PURPOSE:To automatically adjust luminance to optimal luminance even when the device is used in environment where illuminance is greatly changed. CONSTITUTION:In a display device displaying a picture by irradiating a LCD1 which displays the picture by using liquid crystal with a back light 2 from a back side, a sensor means 4 detects the illuminance around a screen and the luminance is automatically adjusted by using voltage value which is previously stored in a memory 6 and for realizing the optimal luminance of the LCD1 and the back light 2 corresponding to the illuminance of circumstance.