Liquid crystal display device and driving method thereof, and electronic device with the liquid crystal display device

摘要

It is an object of the present invention to provide a small-size and highly precise liquid crystal display device which has a function of adjusting luminance by using an optical sensor. Another object of the present invention is to provide a liquid crystal display with high image quality and low power consumption by function of adjusting luminance. A photoelectric conversion device is provided between a liquid crystal display panel and a backlight device. The photoelectric conversion device (also referred to as a photo IC) has a sensor for detecting light and the driver portion for the driving the sensor. The intensity of light from the backlight device can be controlled by detecting the external light which enters the liquid crystal panel and affects the display with the sensor, and by feeding back the data to the backlight device.