Patent ID: 8294825

Claim:
An image display device, comprising: a remote controller and a display device main unit, wherein the display device main unit includes a display section and a luminance control section for adjusting a display luminance of a display image displayed on the display section, and the remote controller includes, a signal transmission section for transmitting a signal to the display device main unit; a light receiving section for measuring brightness of received light; and an operation input section for inputting an instruction regarding control for the display device main unit, the light receiving section being configured to receive light from a direction of the display device main unit, and measure brightness of the received light in association with the input operation performed with the operation input section, and the signal transmission section is configured to transmit, to the display device main unit, brightness information on the brightness of the light received from the direction of the display device main unit, said brightness being measured by the light receiving section, and the luminance control section of the display device main unit is configured to adjust the display luminance of the display image on the display section, in accordance with the received brightness information, wherein the remote controller includes a light receiving control section for determining an input-to-measurement time between the input operation and a start of measurement of brightness which the measurement is performed by the light receiving section, and the light receiving control section is configured to determine the input-to-measurement time in accordance with a time between the input operation and response of the display device main unit which response is based on the instruction regarding the control for the display device main unit.