Light emitting diode lighting device

• US 6,255,786 B1
• Filed: 04/19/2000
• Issued: 07/03/2001
• Est. Priority Date: 04/19/2000
• Status: Active Grant

• Current Assignee: George Yen
• Original Assignee: George Yen
• Inventors: Yen, George
• Primary Examiner(s): Wong, Don
• Assistant Examiner(s): Tran, Thuy Vinh
• Application Number:
  US09/552,005
• Time in Patent Office: 440 Days
• Field of Search: 315/291, 315/292, 315/293, 315/317, 315/318, 340/815.45, 340/825.07, 340/825.18, 362/800
• US Class Current: 315/291
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A light emitting device utilizing a plurality of light emitting diodes (LEDs). LEDs with R/G/B colors are specially arranged to obtain a better light mixing effect. A specially designed heat sink structure is provided to enhance the heat dissipation of LEDs so as to increase the LED density, to decrease its volume and to elongate its lifetime. Furthermore, a newly designed network buffer means is provide for easy connection of the LED system.

Claims

1. A light emitting diode (LED) lighting device, which comprises:

a lighting unit composed of a set of specifically arranged red/green/blue (R/G/B) LEDs;

a set of heat dissipation assembly;

three groups of electric current driving circuits;

a programmed central controller, which can read a serial signals according to an assigned order from a digital network and convert them into parallel ones or serial ones in other format;

a high speed PWM control element composed of a hardware logic circuit;

a set of infrared (IR) receiver and digit display; and

a set of EEPROM for storing all parameters needed in the operation of the lighting device, the parameters being setup by the set of IR receiver and digit display according to a predetermined operation order.

2. The lighting device according to claim 1, wherein the ratio of the numbers of the R/G/B LEDs is R:

G;

B=3;

4;

3.

3. The lighting device according to claim 1, wherein the heat dissipation assembly includes an enlarged LED hot pole pad on the circuit, a soft heat conducting rubber, and a metal heat conducting element, the enlarged hot pole pad can increase the heat transfer.

4. The lighting device according to claim 1, wherein the heat dissipation assembly comprises an forced air-cooling fan to speed up heat transfer and to decrease the volume of the heat dissipation element.

5. The lighting device according to claim 1, wherein the lighting device further comprises a device for automatically inserting a line buffer and a terminate resistor to a digital network, the device including:

a digital network receiver circuit,

a digital network buffer circuit,

a circuit relay, a relay driving controller, which can automatically add a buffer to the digital network according to predetermined conditions;

an LED address device for automatically configuring the addresses of a plurality of LEDs within the same digital network;

the LED address device further comprising;

a digital network receiver circuit,

a digital network buffer circuit,

a digital signal flow controller, two circuit relays; and

a relay driving controller;

wherein the LED lighting device is capable of configuring automatically the network addresses of all LEDs according to the predetermined order and the main controller after the LEDs are installed.

6. The lighting device according to claim 1, wherein the heat dissipation structure comprises a set of two semispherical main heat dissipation devices with two cup shape aluminum heat elements contacted back to back in between, and a soft heat conducting rubber is inserted between the main heat dissipation devices and the aluminum contact device and between the cup shape aluminum contact device and the LED.