Light source device and stereoscopic display

Abstract

A light source device includes: a light guide plate having first and second internal reflection planes facing each other; a first light source applying first illumination light from a side surface of the light guide plate into an interior thereof; a second light source facing the second internal reflection plane, and applying second illumination light to the second internal reflection plane; and a reflective member between the second internal reflection plane and the second light source. The second internal reflection plane is provided with a total-reflection region allowing the first illumination light to be reflected in a total-internal-reflection manner whereas allowing the second illumination light to pass therethrough, and a scattering region allowing the first illumination light to be reflected and scattered. The reflective member is disposed in a position corresponding to the scattering region, and reflects light having passed through the scattering region, toward the first internal reflection plane.

1 . A light source device comprising:
 a light guide plate having a first internal reflection plane and a second internal reflection plane which face each other;   a first light source applying first illumination light from a side surface of the light guide plate into an interior thereof;   a second light source disposed to face the second internal reflection plane of the light guide plate, and applying second illumination light to the second internal reflection plane; and   a reflective member disposed between the second internal reflection plane and the second light source,   wherein the second internal reflection plane is provided with a total-reflection region and a scattering region, the total-reflection region allowing the first illumination light to be reflected in a manner of total-internal-reflection whereas allowing the second illumination light to pass therethrough, and the scattering region allowing the first illumination light to be reflected and scattered, and   the reflective member is disposed in a position corresponding to the scattering region, and reflects light having passed through the scattering region, toward the first internal reflection plane.   
     
     
         2 . The light source device according to  claim 1 , wherein
 the light guide plate is configured to allow a light ray out of a total-reflection condition to exit from the first internal reflection plane, and   the scattering region and the reflective member allow the first illumination light to travel, as the light ray out of the total-reflection condition, toward the first internal reflection plane.   
     
     
         3 . The light source device according to  claim 2 , wherein
 the total-reflection region allows the second illumination light to pass therethrough and to travel, as the light ray out of the total-reflection condition, toward the first internal reflection plane.   
     
     
         4 . The light source device according to  claim 1 , further comprising:
 a transparent substrate disposed between the second internal reflection plane and the second light source,   wherein the reflective member is disposed, on the transparent substrate, in a position corresponding to the scattering region.   
     
     
         5 . The light source device according to  claim 1 , wherein
 the scattering region is formed by processing a surface of the light guide plate into a geometry different from that of the total-reflection region, the surface corresponding to the second internal reflection plane.   
     
     
         6 . The light source device according to  claim 5 , wherein
 the reflective member is disposed on a surface of the scattering region.   
     
     
         7 . The light source device according to  claim 1 , wherein
 the scattering region is formed by disposing, on a surface of the light guide plate, a light-scattering member made of a material different from that of the light guide plate, the surface corresponding to the second internal reflection plane of the light guide plate.   
     
     
         8 . The light source device according to  claim 7 , wherein
 the reflective member is disposed on a topside of the light-scattering member.   
     
     
         9 . A light source device comprising:
 a light guide plate;   a first light source applying first illumination light from a side surface of the light guide plate;   a second light source disposed to face the light guide plate, and applying second illumination light, and   a reflective member disposed between the light guide plate and the second light source,   wherein the light guide plate has:   a reflection region allowing the first illumination light to be reflected whereas allowing the second illumination light to pass therethrough;   a scattering region allowing the first illumination light to be reflected and scattered, and   the reflective member disposed in a position corresponding to the scattering region.   
     
     
         10 . The light source device according to  claim 9 , wherein
 a surface of the scattering region is processed into a geometry different from that of the reflection region.   
     
     
         11 . The light source device according to  claim 9 , wherein
 a light-scattering member made of a material different from that of the light guide plate is disposed on the scattering region.   
     
     
         12 . A stereoscopic display comprising:
 a display section displaying an image; and   a light source device emitting light for image display to the display section,   wherein the light source device includes:   a light guide plate having a first internal reflection plane and a second internal reflection plane which face each other;   a first light source applying first illumination light from a side surface of the light guide plate into an interior thereof;   a second light source disposed to face the second internal reflection plane of the light guide plate, and applying second illumination light to the second internal reflection plane; and   a reflective member disposed between the second internal reflection plane and the second light source,   the second internal reflection plane is provided with a total-reflection region and a scattering region, the total-reflection region allowing the first illumination light to be reflected in a manner of total-internal-reflection whereas allowing the second illumination light to pass therethrough, and the scattering region allowing the first illumination light to be reflected and scattered, and   the reflective member is disposed in a position corresponding to the scattering region, and reflects light having passed through the scattering region, toward the first internal reflection plane.   
     
     
         13 . The stereoscopic display according to  claim 12 , wherein
 the display section selectively displays one of an image based on three-dimensional image data and an image based on two-dimensional image data by switching,   the first light source is controlled to be in a light-on state in the case where an image based on three-dimensional image data is displayed on the display section, and is controlled to be in a light-off state or in a light-on state in the case where an image based on two-dimensional image data is displayed on the display section, and   the second light source is controlled to be in a light-off state in the case where the image based on the three-dimensional image data is displayed on the display section, and is controlled to be in a light-on state in the case where the image based on the two-dimensional image data is displayed on the display section.