Patent ID: 7234854

Claim:
An electro-optical device comprising: an illuminating device including: a light guiding plate; a plurality of light sources that illuminate the light guiding plate with light; and a control unit that controls at least one light source among the plurality of the light sources to illuminate independently from the rest of the light sources; a first display panel disposed on an upper surface of the illuminating device; and a second display panel disposed on a lower surface of the illuminating device; wherein the control unit illuminates all the light sources in a first mode and less than all the light sources in a second mode; wherein the control unit controls an amount of electric current supplied to each light source illuminated in the second mode to be larger than an amount of electric current supplied to each light source illuminated in the first mode; and wherein the control unit determines the amount of electric current supplied to each light source illuminated in the first mode and the amount of electric current supplied to each light source illuminated in the second mode, based on a panel transmittance of the first display panel and a panel transmittance of the second panel, to illuminate the second panel operated in the second mode at a brightness that is about half of a brightness of the first panel operated in the first mode.