Multi-color semiconductor light emitting device

• US 5,324,962 A
• Filed: 06/12/1992
• Issued: 06/28/1994
• Est. Priority Date: 06/13/1991
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Nagasawa, Hiroshi, Komoto, Satoshi, Kawasaki, Hitoshi
• Primary Examiner(s): Hille, Rolf
• Assistant Examiner(s): TRAN, MINH LOAN
• Application Number:
  US07/897,742
• Time in Patent Office: 746 Days
• Field of Search: 257/88, 257/89, 257/99, 257/100, 257/918, 257/921, 313/500, 313/512, 362/800
• US Class Current: 257/89
• CPC Class Codes: H01L 2224/43 Manufacturing methods
• CPC Class Codes: H01L 2224/45015 being circular
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 24/45 of an individual wire connector
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/00011 Not relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01006 Carbon [C]
• CPC Class Codes: H01L 2924/01015 Phosphorus [P]
• CPC Class Codes: H01L 2924/12041 LED
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/42 Antiparallel configurations
• CPC Class Codes: H05B 47/155 Coordinated control of two or more light sources
• CPC Class Codes: Y10S 257/918 Light emitting regenerative switching device, e.g. light emitting scr arrays, circuitry

Abstract

A semiconductor light emitting device of this invention has more than three light emitting diodes which includes a pair of diodes connected parallel in the reverse direction for each other. A common terminal connecting each one of the electrodes of said all diodes, the first terminal in which the other electrodes of said diode pair is connected, and the second terminal in which the other electrode of the rest diode is connected, are provide in order to drive said diodes separately.

Claims

1. A semiconductor light emitting device having a plurality of light emitting diodes which emit different colored light when an electric current is passed therethrough in a forward direction, comprising:

first, second and third light emitting diodes, each of said first, second and third light emitting diodes having first and second electrodes, said first and second light emitting diodes being connected in parallel in the reverse direction;

a common terminal for providing a common electrical connection to each of said first electrodes of said first, second and third light emitting diodes;

a first terminal for providing a common electrical connection to the second electrodes of said first and second light emitting diodes; and

a second terminal for providing electrical connection to the second electrode of said third light emitting diode.

2. The semiconductor light emitting device as claimed in claim 1, wherein a GaP green emitting diode, SiC blue emitting diode, and a GaAlAs red emitting diode are included in said light emitting diodes.

3. The semiconductor light emitting device as claimed in claim 1, wherein said common terminal is comprised of a lead in which all said light emitting diodes are equipped on its top surface.