Liquid crystal display having a light sensor and driving method thereof for adjusting luminance according to that of ambient light

A driving method for a liquid crystal display, the liquid crystal display comprising a liquid crystal panel, an photo sensor positioned at the liquid crystal panel, a timing control circuit, a luminance control circuit, and a backlight circuit, the driving method comprising:

• detecting a luminance of ambient light by the photo sensor, generating a corresponding optical signal representing the luminance of the ambient light, and transmitting the optical signal to the luminance control circuit;
• judging the luminance of the ambient light by the luminance control circuit and sending a measurement signal to the backlight circuit;
• adjusting the luminance of a light source according to the measurement signal via control by the backlight circuit;
• and
• feedbacking the actual luminance of the light source to the luminance control circuit.

A liquid crystal display, comprising:

• a liquid crystal panel;
• a gate driving circuit driven by a power supply to actuate the liquid crystal panel;
• a data driving circuit driven by said power supply to provide a plurality of gradation voltages to the liquid crystal panel;
• a sensor configured measuring a light and generating a corresponding signal;
• a luminance control circuit receiving the signal from the sensor;
• a timing control circuit controlling the gate driving circuit and the data driving circuit;
• and
• a backlight circuit actuated by the power supply to drive a light source to emit light beams for illuminating the liquid crystal panel, according to the signal from the luminance control circuit.