Lighted display including led's mounted on a flexible circuit board

• US 4,774,434 A
• Filed: 08/13/1986
• Issued: 09/27/1988
• Est. Priority Date: 08/13/1986
• Status: Expired due to Term

• Current Assignee: Lennette L. Baker
• Original Assignee: Inovative Products D (Newell Brands Inc.)
• Inventors: Bennion, Don U.
• Primary Examiner(s): Moore, David K.
• Assistant Examiner(s): Wieder, K.
• Application Number:
  US06/896,052
• Time in Patent Office: 776 Days
• Field of Search: 313/500, 313/511, 313/512, 339/17 F, 340/825.82, 340/815.03, 340/815.06, 340/815.07, 340/815.15, 340/815.16, 340/815.17, 357/72
• US Class Current: 313/500
• CPC Class Codes: A41D 27/085 Luminous ornaments
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 2013/222 with LEDs
• CPC Class Codes: G09F 2013/227 Electroluminescent displays for vehicles
• CPC Class Codes: G09G 2380/04 Electronic labels
• CPC Class Codes: G09G 3/14 Semiconductor devices, e.g. diodes
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48464 the other connecting portion not on the bonding area also being a ball bond, i.e. ball-to-ball
• 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 33/52 Encapsulations
• CPC Class Codes: H01L 33/62 Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED display particularly adapted to be used as part of a design on articles of clothing such as tee-shirts, includes a flexible circuit board to which individual LED dies are secured in desired position. The individual dies are electrically connected to traces on the circuit board and are encapsulated on the board so as to protect the individual dies and connections and so that the encapsulating material forms lenses for the dies. In most instances, the display so formed will be completely covered with a protective layer of covering material having a design thereon and having transparent or translucent means over the encapsulated LED dies so that light given off by the LEDs is transmitted through the layer. Control circuitry is provided to supply power to the LEDs, preferably in a predetermined pattern, to cause them to illuminate.

Claims

1. A flexible LED display comprising flexible circuit board means having a plurality of electrical conductive paths thereon;

a plurality of individual LED dies secured to said circuit board means in predetermined positions to mate with a desired design;

means electrically connecting said individual LED dies to appropriate conducting paths of said circuit board;

material encapsulating each individual LED die to provide physical protection for the die and act as a lens for light emitted from the die;

electronic control circuit means electrically connected to the conductive paths on said circuit board for supplying power to selected conductive paths to thereby illuminate selected LEDs;

means adapted to be connected to a power supply for supplying power to the control circuit means; and

design means substantially covering the board and having respective predetermined areas aligned with respective LED dies on the board through which light can pass when an aligned LED is illuminated.

2. An LED display according to claim 1, wherein the design means is a covering material with design thereon bonded to the face of the circuit board means to thereby cover and waterproof said circuit board means.

3. An LED display according to claim 2, wherein the covering material also covers each individually encapsulated LED die.

4. An LED display according to claim 3, wherein the covering material is transparent where it covers an individually encapsulated LED die.

5. An LED display according to claim 3, wherein the covering material is translucent where it covers an individually encapsulated LED die.

6. An LED display according to claim 1, wherein the electronic control means supplies driving power to selected conductive paths in a predetermined sequence.

7. An LED display according to claim 1, wherein individual LED die are secured directly to the circuit board.

8. An LED display according to claim 7, wherein the encapsulating means also encapsulates the means electrically connecting the LED die to the conductive paths.

9. An LED display according to claim 7, wherein each individual LED die is secured directly to an electrical conductive path on the circuit board by a conductive adhesive.

10. An LED display acccording to claim 1, wherein individual LED dies are each mounted on a individual substrate which, in turn, is mounted on the circuit board means.

11. An LED display according to claim 10, wherein the means encapsulating each individual die encapsulates each individual die as mounted on the substrate.

12. An LED display according to claim 11, wherein additional encapsulating material encapsulates the LED die and substrate as mounted on the circuit board means.

13. An LED display according to claim 10, wherein an individual LED die is mounted on the circuit board means by securing the substrate directly to selected electrical conductive paths on the circuit board by conductive adhesive.

14. An LED display according to claim 1, wherein there is additionally included a covering material bonded to the face of the circuit board means to thereby cover and waterproof said circuit board means.

15. An LED display according to claim 1, wherein the electronic control circuit includes a programmable array logic device and wherein said device is connected to form an internal clock, eliminating the need to have a separate clock circuit.

16. An LED display according to claim 1, wherein the electronic control circuit includes a programmable array logic device, wherein said device is connected to selectively operate in an "on" mode wherein power is selectively supplied to the conductive paths or an "off" mode wherein no power is supplied to the conductive paths and wherein membrane switches are provided to cause the device to switch between the "on" or the "off" modes.

17. An LED display according to claim 2, wherein the display is bonded to an item of clothing.

18. An LED display according to claim 17, wherein the means adapted to be connected to a power supply includes male and female snap members extending from connection to the display through the item of clothing so as to be exposed on an inside surface of the item of clothing where they are adapated to mate with mating snap members electrically connected to a power supply.

19. A flexible LED display comprising flexible circuit board means having a plurality of electrical conductive paths thereon;

a plurality of individual LED dies secured to said circuit board means;

means electrically connecting said individual LED dies to appropriate conducting paths of said circuit board;

material encapsulating each individual LED die to provide physical protection for the die and act as a a lens for light emitted from the die;

electronic control circuit means electrically connected to the conductive paths on said circuit board for supplying power to selected conductive paths to thereby illuminate selected LEDs;

a covering material bonded to the face of the circuit board means to thereby cover and waterproof said circuit board means; and

means adapted to be connected to a power supply for supplying power to the control circuit means.