Light emitting diode display

• US 5,226,723 A
• Filed: 05/11/1992
• Issued: 07/13/1993
• Est. Priority Date: 05/11/1992
• Status: Expired due to Fees

• Current Assignee: Der-Jong Chen
• Original Assignee: Der-Jong Chen
• Inventors: Chen, Der-Jong
• Primary Examiner(s): Lazarus, Ira S.
• Assistant Examiner(s): Quach, Y.
• Application Number:
  US07/881,209
• Time in Patent Office: 428 Days
• Field of Search: 362/235, 362/236, 362/237, 362/241, 362/247, 362/249, 362/310, 362/350, 362/800, 313/501, 313/512
• US Class Current: 362/241
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 33/60 Reflective elements
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An improved light emitting diode display includes a printed circuit board, a reflector and one or more LED chips. The printed circuit board serves as a base to fix the LED chips and the reflector has an appropriate thickness, contains one or more bowl-like reflective surfaces each with a corresponding passing hole located at such position as close to the bowl-like reflective surface as possible. The bowl-like reflective surface are just big enough to hold one LED chip, with the LED electrode connecting wire extending out of the bowl-like reflective surface and passing through the passing hole to be fixed to the printed circuit board. The small size of the reflective surface permits increased convergency and intensity of the reflective light emitted by the LED chips.

Claims

1. An improved light emitting diode display, comprising:

a printed circuit board;

an LED chip fixed on the printed circuit board;

a reflector fixed on the printed circuit board;

a bowl-shaped reflective surface in the reflector which surrounds the LED chip fixed to the printed circuit board;

an electrode connecting wire extending from a top portion of the LED chip to outside the bowl-shaped reflective surface, and back through the reflector to the printed circuit board, to which the electrode connecting wire is fixed.

2. An improved light emitting diode display as claimed in claim 1, wherein said reflector comprises a passing hole close to the bowl-shaped reflective surface, said electrode connecting wire passing from the top portion of the LED chip into and through the passing hole to the printed circuit board.

3. An improved light emitting diode display as claimed in claim 1, wherein said reflector contains a plurality of said bowl-shaped reflective surfaces, each surrounding an LED chip.

4. An improved light emitting diode display as claimed in claim 1, wherein said reflector forms a matrix, of bowl-shaped reflective surfaces said electrode connecting wire passing from the top portion of the LED chip through opening in the matrix of bowl-shaped reflective surfaces to the printed circuit board.