Luminescent diode, fabrication method thereof, and backlight assembly having the same
View Patent ↗A luminescent diode (LED) that improves brightness uniformity, a fabrication method thereof, and a backlight assembly having the same are disclosed. The LED includes an LED chip that emits light in a side surface of an LCD device; and an optical guide element on the LED chip that enlarges a radiation angle of the light. The LED may alternatively include an LED chip that emits light on a bottom surface of the LCD device; and an optical guide element on the LED chip that enlarges a radiation angle of the light. The radiation angle of light maximally enlarged to prevent hot spots caused by brightness nonuniformity. An enhanced image quality results.
1. A luminescent diode (LED) for a liquid crystal display (LCD) device, comprising:
a plurality of LED chips to emit light on a side surface of the LCD device;
a fluorescent mold surrounding the LED chip;
an epoxy formed on the fluorescent mold; and
a plurality of optical fibers buried in the epoxy to enlarge a radiation angle of the light,
wherein each optical fiber includes a core in which light propagates, a cladding layer formed on the core to reflect light, and a coating layer formed on the cladding layer to intensify the strength of the optical fiber.
2. The luminescent diode (LED) according to claim 1 , wherein each optical fiber includes one of a glass material and a plastic material.
3. The luminescent diode (LED) according to claim 1 , wherein each of the optical fibers is inclined at a predetermined angle in a range of about 20° to about 60° based on a bottom surface of the epoxy.
4. The luminescent diode (LED) according to claim 1 , wherein the epoxy includes a first epoxy and a second epoxy on the first epoxy.
5. The luminescent diode (LED) according to claim 1 , wherein a length of each optical fiber is about 750 μm, and a diameter of each optical fiber is about 250 μm.
6. A backlight assembly, comprising:
a light source, the light source includes:
a plurality of LED chips to emit light around a liquid crystal display device;
a fluorescent mold surrounding each LED chip;
a epoxy formed on the fluorescent mold; and
a plurality of optical fibers buried in the epoxy to enlarge a radiation angle of the light,
wherein each optical fiber includes a core in which light propagates, a cladding layer formed on the core to reflect light, and a coating layer formed on the cladding layer to intensify the strength of the optical fiber; and
an optical sheet that diffuses and condenses light emitted from the light source.
7. The backlight assembly according to claim 6 , further comprising a light guide plate substantially coplanar with the light source that converts light generated from the light source into a surface light and that irradiates light towards the liquid crystal display device.
8. The backlight assembly according to claim 6 , wherein each optical fiber has a predetermined tilt angle in a range of about 20° to about 60° based on a bottom surface of the epoxy.
9. A luminescent diode (LED) for a liquid crystal display (LCD) device, comprising:
a plurality of LED chips to emit light on a bottom surface of the LCD device;
a fluorescent mold surrounding the LED chip;
an epoxy formed on the fluorescent mold; and
a plurality of optical fibers buried in the epoxy to enlarge a radiation angle of the light,
wherein each optical fiber includes a core in which light propagates, a cladding layer formed on the core to reflect light, and a coating layer formed on the cladding layer to intensify the strength of the optical fiber.