AC—LED system in single chip with three metal contacts

• US 7,948,770 B2
• Filed: 12/08/2006
• Issued: 05/24/2011
• Est. Priority Date: 12/09/2005
• Status: Expired due to Fees

• Current Assignee: Epistar Corporation
• Original Assignee: Industrial Technology Research Institute
• Inventors: Yeh, Wen-Yung, Lin, Ming-Te, Huang, Sheng-Pan, Kuo, Chia-Chang, Yen, Hsi-Hsuan
• Primary Examiner(s): Levi; Dameon E
• Assistant Examiner(s): NGUYEN, HOA CAO
• Application Number:
  US11/608,786
• Publication Number:
  US 20070138495A1
• Time in Patent Office: 1,628 Days
• Field of Search: 361/760, 361/761, 361/767, 361/768, 361/777, 361/781, 361/806, 361/805, 361807-810, 362/226, 362/227, 362/262, 362/238, 362/800, 362/249.01, 362/249.02, 362/249.06, 362/249.11, 362/249.13, 362/249.14, 362/249.15, 315184-185 R, 257 88- 99, 257/82, 257/164
• US Class Current: 361/806
• CPC Class Codes: H05B 45/00 Circuit arrangements for operating light-emitting diodes [LED]
• CPC Class Codes: H05B 45/42 Antiparallel configurations

Abstract

A plurality of AC_LED units are coupled and disposed on a single chip to form an AC_LED system in single chip with three metal contacts to be driven by three-phase voltage sources. Alternatively, an AC_LED system in single chip with four metal contacts is also disclosed to be driven by four-phase voltage sources.

Claims

1. A LED system in a single chip with three metal contacts, comprising:

first, second, and third metal contacts disposed on a substrate;

a plurality of LED units disposed on the substrate, comprising a first series of LED units having a first end coupled to the first metal contact and a second end coupled to the second metal contact,

a second series of LED units having a first end coupled to the first metal contact and a second end coupled to the third metal contact, and

a third series of LED units having a first end coupled to the second metal contact and a second end coupled to the third metal contact;

wherein any two of the three series of LED units are not parallel with each other.

2. The LED system in a single chip as claimed in claim 1, wherein each of the metal contacts is a metal pad.

3. The LED system in a single chip as claimed in claim 1, wherein the LED units are disposed with area division between the metal contacts.

4. An AC_LED system in a single chip comprising twelve DC_LED units on a same substrate, comprising:

seven metal contacts each coupled to neighboring electrodes of neighboring DC_LED units;

a positive electrode of a first DC_LED, a negative electrode of an eighth DC_LED, and a positive electrode of a second DC_LED, being coupled to a second metal contact;

a negative electrode of the second DC_LED, a positive electrode of an ninth DC_LED, and a negative electrode of a third DC_LED, being coupled to a third metal contact;

a positive electrode of the third DC_LED, a negative electrode of a tenth DC_LED, and a positive electrode of a fourth DC_LED, being coupled to a fourth metal contact;

a negative electrode of the fourth DC_LED, a positive electrode of an eleventh DC_LED, and a negative electrode of a fifth DC_LED, being coupled to a fifth metal contact;

a positive electrode of the fifth DC_LED, a negative electrode of a twelfth DC_LED, and a positive electrode of a sixth DC_LED, being coupled to a sixth metal contact;

a negative electrode of the sixth DC_LED, a positive electrode of an seventh DC_LED, and a negative electrode of the first DC_LED, being coupled to a first metal contact; and

a negative electrode of the seventh DC_LED, a positive electrode of the eighth DC_LED, and a negative electrode of the ninth DC_LED, a positive electrode of the tenth DC_LED, and a negative electrode of the eleventh DC_LED, a positive electrode of the twelfth DC_LED, being coupled to a seventh metal contact.

5. The AC_LED system in a single chip as claimed in claim 4, wherein each of the metal contacts is a metal pad.