High reliability and long lifetime AC LED device

• US 20110084617A1
• Filed: 12/01/2009
• Published: 04/14/2011
• Est. Priority Date: 10/08/2009
• Status: Abandoned Application

• Current Assignee: Forward Electronics Company Limited
• Original Assignee: Forward Electronics Company Limited
• Inventors: Yang, Jen-Hua, Lan, Pei-Hsuan
• Application Number:
  US12/591,762
• Publication Number:
  US 20110084617A1
• Time in Patent Office: Days
• US Class Current: 315/185.R
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/37 Converter circuits

Abstract

A high reliability and long lifetime AC LED device includes: an LED group, a rectifier diode group and an AC power. The LED group includes a plurality of LED micro-chips connected in series. The rectifier diode group includes four rectifier diodes. The AC power is electrically connected to the rectifier diode group, and the rectifier diode group is electrically connected to the LED group. The AC power includes a positive half-cycle voltage and a negative half-cycle voltage. The rectifier diode group enables the LED group to conduct both in positive and negative half-cycle voltage, so as to prevent the LED group from bearing high reverse bias voltage, and extend the light-emitting lifetime and enhance the reliability.

Claims

1. A high reliability and long lifetime AC LED device comprising:

an LED group composed of a plurality of LED micro-chips connected in series and having an anode and a cathode;

a rectifier diode group composed of a first rectifier diode, a second rectifier diode, a third rectifier diode and a forth rectifier diode, each rectifier diode having an anode and a cathode, the cathode of the first rectifier diode being connected to the cathode of the second rectifier diode and the anode of the LED group, the anode of the second rectifier diode being connected to the cathode of the third rectifier diode, the anode of the third rectifier diode being connected to the anode of the forth rectifier diode and the cathode of the LED group, the cathode of the forth rectifier diode being connected to the anode of the first rectifier diode; and

an AC power source electrically connected to the anode of the first rectifier diode and the cathode of the third rectifier diode of the rectifier diode group;

wherein the AC power source provides a positive half-cycle voltage and a negative half-cycle voltage, and the rectifier diode group enables the LED group to be turned on both in the positive half-cycle voltage and the negative half-cycle voltage.

2. The high reliability and long lifetime AC LED device of claim 1, wherein the plurality of LED micro-chips of the LED group are manufactured in a chip.

3. The high reliability and long lifetime AC LED device of claim 1, wherein the first rectifier diode, the second rectifier diode, the third rectifier diode and the forth rectifier diode are diode devices respectively.

4. The high reliability and long lifetime AC LED device of claim 3, wherein each of the diode devices is a high-voltage rectifier diode.

5. The high reliability and long lifetime AC LED device of claim 1, wherein the LED group and the rectifier diode group are integrated into a chip package.

6. The high reliability and long lifetime AC LED device of claim 5, wherein the plurality of LED micro-chips of the LED group are arranged in a non-matrix pattern.

7. The high reliability and long lifetime AC LED device of claim 5, wherein the LED group and the rectifier diode group are wire-bonded on a frame.