Display panel having semiconductors crystals

• US 4,593,485 A
• Filed: 05/30/1984
• Issued: 06/10/1986
• Est. Priority Date: 05/30/1983
• Status: Expired due to Fees

• Current Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Original Assignee: US Philips Corporation (Koninklijke Philips N.V.)
• Inventors: Thillays, Jacques C.
• Primary Examiner(s): Mancene, Gene
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US06/615,420
• Time in Patent Office: 741 Days
• Field of Search: 40/447, 40/448, 40/451, 40/452, 40/550, 40/573
• US Class Current: 40/452
• CPC Class Codes: F21S 43/14 Light emitting diodes [LED]
• CPC Class Codes: F21S 43/195 Details of lamp holders, terminals or connectors
• CPC Class Codes: F21S 43/30 characterised by reflectors
• CPC Class Codes: F21V 7/0083 Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane combination of two or more reflectors F21V7/0025
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 13/0472 Traffic signs
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes
• CPC Class Codes: H01L 2224/45139 Silver (Ag) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48472 the other connecting portion not on the bonding area also being a wedge bond, i.e. wedge-to-wedge
• CPC Class Codes: H01L 2224/73265 Layer and wire connectors
• 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 2924/01005 Boron [B]
• CPC Class Codes: H01L 2924/01039 Yttrium [Y]
• CPC Class Codes: H01L 2924/01049 Indium [In]
• CPC Class Codes: H01L 2924/01058 Cerium [Ce]
• CPC Class Codes: H01L 2924/181 : Encapsulation
• CPC Class Codes: H01L 33/60 : Reflective elements

Abstract

A display panel comprises a plurality of semiconductor crystals (6) fixed at the bottom of reflecting cavities (3).

The cavities (3) are obtained from strips supporting two rows of complementary half-shells (1, 2) and supporting the connection means of the semiconductor crystals (6).

Claims

1. A display panel comprising a plurality of semiconductor crystals, each crystal having at least two regions of opposite conductivity forming an electroluminescent junction, said crystals being situated at the bottoms of cavities for reflecting light emitted by said crystals during operation of the display panel, said cavities being formed in strips of material and being disposed according to a previously chosen configuration, and each cavity having at least two metallic connection pads made respectively to contact the two regions of the semiconductor crystal situated at the bottom, characterized in that each of the strips comprises a first and a second row of half-shells disposed in a back-to-back arrangement and producing complementary cavity portions, the half-shells of the first row comprising, at their bottoms, supports and the first connection pads for the semiconductor crystals, and the half-shells of the second row comprising, at their bottoms, metallic contact pads constituting the second connections for said crystals, and in that at least two identical strips are insulated from each other by an insulation material, the two identical strips being associated such that the identical strips form a series of cavities.

2. A display panel as claimed in claim 1, characterized in that the half-shells of two rows of one strip produce cavity portions of equal volume and are symmetrical with respect to a plane perpendicular to said strip and separating said strip into two equal parts corresponding to the rows of half-shells.

3. A display panel as claimed in claim 1, characterized in that the half-shells of two rows of one strip produce two complementary cavity portions of different volumes, the half-shells serving to support the semiconductor crystals being of a higher volume part than that of the half-shells serving to support the second connection, said crystals being centered on an optical axis of the cavities produced by the complementary half-shells.

4. A display panel as claimed in claim 1, 2 or 3, characterized in that each semiconductor crystal is fixed on a boss produced at the bottom of the half-shell which serves to support it.

5. A display panel as claimed in claim 4, characterized in that the contact point between the half-shells serving to support the second connection of the crystals is produced on a boss formed at the bottom of said half-shell.

6. A display panel as claimed in claim 1, 2, 3, 4 or 5, characterized in that the half-shells are produced from metallic strips which are supported by a plate of insulating plastic material.

7. A display panel as claimed in claim 1, 2, 3, 4 or 5, characterized in that the half-shells are of an insulating and rigid synthetic material covered at least partly by a metallic layer having a high reflecting power.

8. A display panel as claimed in claim 1, characterized in that the semiconductor crystals and their contacts are disposed on bosses obtained from metallic grids moulded in the bottom of the half-shells of a synthetic material.