Light guide plate, surface light source device and display

A surface light source device comprising:

• a light guide plate having an emission face for outputting light, a back face opposite with said emission face, an incidence face for inputting light and a distal end face located opposite to said incidence face;
• and
• a primary light source to supply light into said light guide plate through said incidence face,
• wherein at least one of said back face and said emission face provides an emission promotion surface to urge a backward inner propagation light to be emitted preferentially from said emission face, said backward inner propagation light being produced by a reflection at said distal end and then travelling as to approach said incidence face,
• said primary light source inputting the light to the incidence face and comprising a point-like light emitter so that an obliquely travelling forward inner propagation light is mainly produced.

A display including a liquid crystal display panel and a surface light source device for illuminating said liquid crystal display panel, said surface light source device comprising:

• a light guide plate having an emission face for outputting light, a back face opposite with said emission face, an incidence face for inputting light and a distal end face located opposite to said incidence face;
• and
• a primary light source to supply light into said light guide plate through said incidence face,
• wherein at least one of said back face and said emission face provides an emission promotion surface to urge a backward inner propagation light to be emitted preferentially from said emission face, said backward inner propagation light being produced by a reflection at said distal end and then travelling as to approach said incidence face,
• said primary light source inputting the light to the incidence face and comprising a point-like light emitter so that an obliquely travelling forward inner propagation light is mainly produced.