Light Emitting Diodes and Direct Type Backlights

Abstract

A light emitting diode (LED) comprises a substrate, an LED chip, a first electrode, a second electrode, a sealing layer and a reflecting layer. The substrate is provided with a groove, the reflecting layer is attached to the bottom face of the groove, the LED chip is placed inside the groove and placed above the reflecting layer, and the sealing layer is filled in the groove of the substrate to cover the reflecting layer and wrap the LED chip. The reflecting layer comprises a first reflecting layer and a second reflecting layer. The first reflecting layer is placed in the center of the bottom face of the groove, and the second reflecting layer surrounds the periphery of the first reflecting layer and is connected with the first reflecting layer. The surface of the first reflecting layer is a convex face, and the surface of the second reflecting layer is a concave face. The LED chip is electrically connected with the first electrode and the second electrode, and the LED chip is provided with a light-emitting face which is opposite to the reflecting layer. The invention further provides a down-straight type backlight source with the LED.

Description

technical field [0001] The invention relates to a light-emitting diode and a direct-down backlight source using the light-emitting diode. Background technique [0002] Light-emitting diodes are energy-saving, environmentally friendly, and long-life solid-state light sources. Therefore, the research on light-emitting diode technology has been very active in the past ten years, and light-emitting diodes are gradually replacing traditional light sources such as fluorescent lamps and incandescent lamps. [0003] The light-emitting diodes in the prior art generally include a substrate, a reflective layer, a light-emitting diode chip and a packaging layer, the reflective layer is attached to the surface of the substrate, the light-emitting diode chip is located above the reflective layer, and the light-emitting diode chip has an orientation On the light emitting surface of the reflective layer, the encapsulation layer covers the reflective layer and wraps the LED chip. The light ...

AI Technical Summary

Problems solved by technology

However, the light intensity of a single light-emitting diode emitted sideways is relatively small. When using this light-emitting diode to manufacture a backlight, it is necessary to arrange multiple light-emitting diodes densely on a panel.

Due to the large number of LEDs used, the distance between each LED is small, and each LED generates more heat when it is working. Several hot spots (hotspots) will appear in the backlight due to heat accumulation. If the heat If it is not released in time, the temperature of the LED will be too high to work normally, or even burned out.

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