Abstract: A screen illumination device includes a body, a first light source, and a second light source. The body includes a first housing and a second housing. The second housing is detachably connected to the first housing. The first light source is connected to the body and adapted to generate a first light beam. The second light source is connected to the body and adapted to generate a second light beam. The first housing is adapted to allow the first light beam to emit out along a first direction, the second housing is adapted to allow the second light beam to emit out along a second direction, and the second direction is different from the first direction.

Abstract: A displaying method for a portable device under a standby condition is provided. The portable device includes a display unit displaying a first standby frame. The method includes steps of sensing a physical motion of the portable device. Then, the physical motion is identified as an operation command. Finally, according to the operation command, a corresponding operation is executed to change the first standby frame displayed on the display unit.