Patent ID: 8514348

Claim:
A liquid crystal display device, comprising: a light guide plate for reflecting incident light from an end surface of the light guide plate in an inside to obtain surface emission from a front surface thereof, the light guide plate comprising protrusions and recesses which are formed on a rear surface on an opposite side of the front surface; a light source disposed so as to face the end surface of the light guide plate; a liquid crystal display panel disposed on the front surface side of the light guide plate; and a polarizer disposed between the light guide plate and the liquid crystal display panel; wherein the protrusions and recesses are formed of a shape in which a plurality of first mountain-range shapes and a plurality of second mountain-range shapes are combined; wherein each of the plurality of first mountain-range shapes includes a first ridge continuing along a first direction, which is a direction toward the inside from the end surface; wherein each of the plurality of second mountain-range shapes includes a second ridge continuing along a second direction intersecting with the first direction; wherein each of the plurality of first mountain-range shapes includes a pair of first side surfaces on both sides of the first ridge; wherein each of the plurality of second mountain-range shapes includes a pair of second side surfaces on both sides of the second ridge; wherein an angle between the pair of first side surfaces is between 90° to 130°; and wherein the polarizer transmits P-polarized light but blocks S-polarized light, the P-polarized light being linearly-polarized light in which an electric field oscillates in a plane including the first direction and a normal to the front surface of the light guide plate.