Display device and planar light source device
View Patent ↗The present invention relates to a technique which makes a backlight used in a liquid crystal display device thin and light-weight. The present invention provides a liquid crystal display device which includes a display panel and a backlight arranged behind the display panel, wherein the backlight includes a film-like light guide member, a film-like light semi-transmissive member adhered to a first surface of the light guide member which faces the display panel in an opposed manner, a film-like reflective member adhered to a back surface of the light guide member opposite to the first surface, and a spot light source arranged at a position of the light guide member at which light is incident on the light guide member from the first surface or the back surface. A refractive index of the light semi-transmissive member is set smaller than a refractive index of the light guide member.
1. A light emitting device comprising:
a light guide member having a first surface and a second surface that is opposite the first surface;
a light source having at least one LED;
a light adjusting member positioned between the light source and a first portion of the first surface of the light guide member;
a first reflective plate formed on a second portion of the first surface of the light guide member; and
a second reflective plate formed on the second surface of the light guide member, wherein
the light adjusting member includes a surface portion and a plurality of columnar projections on the surface portion, each of the plurality of columnar projections having a distal end surface and first and second side surfaces,
the distal end surfaces of the projections are in contact with the first portion of the first surface of the light guide member,
the light source, the light adjusting member, the light guide member, and the second reflective plate are arranged in this order in a direction perpendicular to a flat surface of the first reflective plate,
the light adjusting member and the light source are positioned on the first portion of the first surface of the light guide member,
in plan view, the light source, the adjusting member, the light guide member, and the second reflective plate are overlapped in each other,
in plan view, the first reflective plate does not overlap the light source,
in plan view, a large portion of the first reflective plate does not overlap a large portion of the second reflective plate, and
a first plane area of the first reflective plate is larger than a second plane area of the second reflective plate.
2. The light emitting device according to claim 1 , wherein the first side surfaces of the columnar projections are convex curve shaped,
the second side surfaces of the columnar projections are planar shaped, and
the first side surface of each of the columnar projections, the distal end surface of each of the columnar projections, the second side surface of each of the columnar projections, and the first reflective plate are arranged in this order in a direction parallel to a flat surface of the first reflective plate.
3. The light emitting device according to claim 1 , further comprising:
a prism sheet formed between the second surface of the light guide member and the second reflective sheet.
4. The light emitting device according to claim 3 , further comprising:
a semi-transmissive film formed between the second surface of the light guide member and the prism sheet.
5. The light emitting device according to claim 1 , further comprising:
a radiation-light adjusting member positioned at a first portion of the second surface of the light guide member, the second reflective plate being formed on a second portion of the second surface of the light guide member, wherein
the radiation-light adjusting member includes a surface portion and a plurality of columnar projections on the surface portion, each of the plurality of columnar projections having a distal end surface and a first and second side surfaces, and
the distal end surfaces of the projections are in contact with the first portion of the second surface of the light guide member.