Patent ID: 7862190

Claim:
A cell phone comprising: a first casing having a plurality of keys; a second casing which is pivotally coupled to the first casing, and which includes a first display section adapted to face the first casing and a second display section on an opposite side of the second casing from the first display section; and a display device mounted on the second casing, the display device comprising: a flat backlight including a light source which emits light and a light guide plate having an end face facing the light source and two opposing surfaces, wherein the light from the light source is incident on the end face, and is partially guided in the light guide plate while being internally reflected by the two opposing surfaces, so as to partially emerge from the two opposing surfaces; a first reflection polarizing plate, which is disposed on a side of a first one of the two opposing surfaces, and which partially transmits the light emerged from the first opposing surface toward a front side, and partially returns the light to a rear side; a second reflection polarizing plate, which is disposed on a side of a second one of the two opposing surfaces, and which transmits at least a part of the light emerged from the second opposing surface; a first liquid crystal display which faces the first display section of the second casing, and which includes a front side and a back side and two polarizing plates disposed on the front side and the back side, respectively; and a second liquid crystal display which faces the second display section of the second casing, and which includes a front side and a back side and two polarizing plates disposed on the front side and the back side, respectively.