In this surface light source device, light is incident from a plurality of point light sources 2 arranged on a one side end surface of a light guide plate 1, is reflected on a light reflecting surface 11 on a rear surface of the light guide plate 1, and is emitted from a front surface of the light guide plate 1. The point light sources 2 comprise white light emitting diode elements. Two white light emitting diode elements out of six of the white light emitting diode elements having chromaticity outermost from a center of an aimed chromaticity range in opposite hue directions are arranged in an approximately center of a group of the white diode elements.
A backlight unit for use in a liquid crystal display comprises a light guiding plate comprising a light exiting surface, a light reflective surface, and a light incident surface, a light source unit comprising a substrate and a light source disposed on the substrate, wherein the light source unit is disposed to face the light incident surface of the light guiding plate, and a reflecting sheet comprising a first portion facing the light reflective surface of the light guiding plate, a second portion facing the light exiting surface of the light guiding plate, and a third portion connecting the first and the second portions, wherein the third portion comprises light source exposing parts.
In a light emitting device including a transparent covering, a fastener having a vertical member and a horizontal member, a light-emitting chip disposed on one face of the vertical member and encased by the transparent covering, a circuit board disposed on one face of the horizontal member, at least one conductive means connecting the light-emitting chip to the circuit board, and at least one heat-dissipating plate perpendicularly disposed on the other face of the horizontal member, light may be emitted longitudinally along a light-guiding plate, thus optimizing the travel path of the emitted light, while maintaining a compact shape by enabling placement of the printed circuit board and heat dissipating plates away from a longitudinal axis of the light-guiding plate.
An exemplary backlight module (22) includes a light guide plate (21), an illumination device (20), and plural reflection sheets (23). The illumination device is opposite to the light guide plate, and includes a supporting member (242), and plural light emitting diodes (240) formed at the supporting member. The plural reflection sheet is integrally formed with the supporting member.
A light source for a display device includes a board and light emitting diodes mounted on the board. The light emitting diodes include a white light emitting diode which emits white light and a red light emitting diode which emits red light.
A light source device including a light-guiding pillar, an opaque layer, and a light source is provided. The light-guiding pillar has a light incident surface and a light emitting surface, and the light incident surface is adjacent to the light emitting surface. In addition, the opaque layer is disposed on the surfaces of the light-guiding pillar outside the light incident surface and the light emitting surface. The light source is disposed near the light incident surface. The light emitted from the light source propagates into the light-guiding pillar through the light incident surface, and then emits from the light emitting surface.
