Light guide plate and surface light source device

A light guide plate comprising:

• a light introduction part comprising an end face configured to have light incident thereon;
• and
• a light guide plate body provided continuously to the light introduction part and comprising a thickness smaller than maximum thickness of the light introduction part,
• wherein the light guide plate body comprises a light emitting surface configured to emit light incident from the end face,
• wherein a directivity conversion pattern is provided on at least one of a face on a light exit side and a face opposite to the face,
• wherein the directivity conversion pattern converts directivity spread in a thickness direction of the light introduction part to a directivity characteristic which is inclined in a direction parallel to a face direction of the light introduction part,
• wherein a light reflection wall is provided on the end face, and
• wherein the light reflection wall has, when viewed from a direction perpendicular to the light emitting surface, at least a part of regions inclined with respect to a direction perpendicular to the end face, and a normal which is set for a surface of the light reflection wall inclined from the direction parallel to the light emitting surface.

A mobile device comprising:

• a liquid crystal display device comprising:
• a light source that emits light;
• a light guide plate comprising:
• a light introduction part comprising an end face opposite the light source that receives light incident from the light source;
• and
• a light guide plate body provided continuously to the light introduction part and comprising a thickness smaller than maximum thickness of the light introduction part,
• wherein the light guide plate body comprises a light emitting surface configured to emit light incident from the end face,
• wherein a directivity conversion pattern is provided on at least one of a face on a light exit side and a face opposite to the face,
• wherein the directivity conversion pattern converts directivity spread in a thickness direction of the light introduction part to a directivity characteristic which is inclined in a direction parallel to a face direction of the light introduction part,
• wherein a light reflection wall is provided on the end face,
• wherein the light reflection wall has, when viewed from a direction perpendicular to the light emitting surface, an angle formed by a region close to the end face and a direction perpendicular to the end face being smaller than an angle formed by a region far from the end face and the direction perpendicular to the end face,
• wherein, when viewed from a direction perpendicular to the light emitting surface, a width of the light reflection wall at an end on the side of the end face is smaller than a width of the light reflection wall at an end on the side opposite to the end face;
• and
• a liquid crystal panel disposed so as to face the light emitting surface of the light guide plate