Abstract: A portable device including an external-light-shielding sheet is provided. The portable device includes a display panel; and an external-light-shielding sheet arranged on the display panel, wherein the external-light-shielding sheet includes a base portion and a plurality of wedge shaped portions arranged on the base portion to absorb external light. Therefore, it is possible to absorb and block as much external light as possible. In addition, it is possible to improve bright-room contrast by effectively realizing a black image on a display panel.

Abstract: A portable device including an external-light-shielding sheet is provided. The portable device includes a display panel; and an external-light-shielding sheet arranged on the display panel, wherein the external-light-shielding sheet includes a base portion and a plurality of wedge shaped portions arranged on the base portion to absorb external light. Therefore, it is possible to absorb and block as much external light as possible. In addition, it is possible to improve bright-room contrast by effectively realizing a black image on a display panel.

Abstract: The present invention is directed to a surface light source device utilizing a light pipe. The present invention is also directed to a backlight unit and a liquid crystal display which are provided with such surface light source device. A surface light source device comprises at least one light source generating light; and at least one hollow light pipe, the light pipe includes a first light waveguide unit with structured surface on at least one side; and, a second light waveguide unit with structured surface on at least one side and disposed substantially parallel to the first light waveguide unit, wherein a longitudinal direction of the structured surface of the first light waveguide unit and a longitudinal direction of the structured surface of the second light waveguide unit form a certain angle.

Abstract: The present invention is directed to a surface light source utilizing a light pipe. The present invention is also directed to a backlight unit and a liquid crystal display which are provided with such surface light source. The light pipe includes an inner surface structured with a plurality of prisms, wherein the light from the light source is incident on the inner surface; and a smooth outer surface having a light emitting surface disposed substantially parallel to the liquid crystal panel, wherein the incident light is emitted through the light emitting surface.