Mobile wireless communications device with reduced interfering energy from the display and related methods

• US 9,806,826 B2
• Filed: 10/24/2013
• Issued: 10/31/2017
• Est. Priority Date: 08/31/2004
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Zhu, Lizhong, Corrigan, Michael Stephen, Jarmuszewski, Perry, George, Liviu, Mankaruse, George Soliman, Robinson, James Alexander, Drader, Marc A.
• Primary Examiner(s): Obayanju, Omoniyi
• Application Number:
  US14/062,297
• Publication Number:
  US 20140051481A1
• Time in Patent Office: 1,468 Days
• Field of Search: 455 631, 455566
• CPC Class Codes: H04B 15/02 Reducing interference from electric apparatus by means located at or near the interfering apparatus
• CPC Class Codes: H04M 1/0266 for a display module assembly
• CPC Class Codes: H05K 1/0233 Filters, inductors or a magnetic substance
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

A mobile wireless communications device includes a housing and circuit board carried by the housing and includes radio frequency (RF) circuitry and a processor carried by the circuit board and operative with each other. A display connector for an LCD connector is mounted on the circuit board and adapted to be connected to a display. Display connection lines are carried by the circuit board and interconnect the display connector and processor for carrying signals from the processor to the display connector and a connected display. Filters are carried by the circuit board and connected to the display connection lines and reduce any interfering energy from the processor and display.

Claims

1. An electronic device comprising:

a display;

a processor coupled to a circuit board, wherein the circuit board includes a cellular transceiver;

a display connector coupled to said circuit board and coupled to said display, wherein the cellular transceiver is isolated from the display connector by a first isolation structure surrounding the cellular transceiver;

a microphone coupled to the circuit board, wherein the microphone is isolated from the cellular transceiver by a second isolation structure;

a plurality of display connection lines interconnecting said processor, and said display connector carried by the circuit board; and

a plurality of filters with each filter arranged as a filter array and coupled to a respective one of the plurality of display connection lines, wherein the plurality of filters reduce radio frequency electromagnetic interference (EMI).

2. The electronic device of claim 1, wherein the plurality of display connection lines further comprise signal traces on at least one layer of said circuit board.

3. The electronic device of claim 1, wherein said plurality of filters is between the processor and the display connector.

4. The electronic device of claim 1 further comprising a bypass capacitor coupled to a respective one of the plurality of display connection lines and to ground.

5. The electronic device of claim 1, wherein each one of the plurality of filters comprises a ferrite inductor.

6. The electronic device of claim 1, wherein each one of the plurality of filters comprises an LC filter serially coupled to a respective one of the plurality of display connection lines.

7. The electronic device of claim 1, wherein said plurality of filters define a plurality of arrays of LC filters serially coupled into said plurality of display connection lines.

8. The electronic device of claim 1, wherein said plurality of filters is carried by said circuit board.

9. The electronic device of claim 1 further comprising a respective second filter coupled into one of said display connection lines.

10. The electronic device of claim 1, wherein said display comprises a liquid crystal display (LCD).

11. An electronic device comprising:

a circuit board;

a processor coupled to said circuit board, wherein the circuit board includes a cellular transceiver;

a display connector coupled to said circuit board wherein the cellular transceiver is isolated from the display connector by an isolation structure surrounding the cellular transceiver;

a microphone coupled to the circuit board, wherein the microphone is isolated from the cellular transceiver by a second isolation structure;

a plurality of display connection lines interconnecting said processor, and said display connector carried by the circuit board; and

a plurality of filters with each filter arranged as a filter array and coupled to a respective one of the plurality of display connection lines, wherein the plurality of filters are tuned to reduce radio frequency electromagnetic interference (EMI) generated by the electronic device.

12. The electronic device of claim 11, wherein the plurality of display connection lines further comprises signal traces on at least one layer of said circuit board.

13. The electronic device of claim 11, wherein said plurality of filters is between the processor and the display connector.

14. The electronic device of claim 11 further comprising a display coupled to the display connector and to the plurality of display connection lines.

15. The electronic device of claim 14, wherein said display comprises a liquid crystal display (LCD).

16. The electronic device of claim 11 further comprising a bypass capacitor coupled to a respective one of the plurality of display connection lines and to ground.

17. The electronic device of claim 11, wherein each one of the plurality of filters comprises a ferrite inductor.

18. The electronic device of claim 11, wherein each one of the plurality of filters comprises an LC filter serially coupled to a respective one of the plurality of display connection lines.

19. The electronic device of claim 11, wherein said plurality of filters define a plurality of arrays of LC filters serially coupled into said plurality of display connection lines.

20. The electronic device of claim 11 further comprising a respective second filter coupled into one of said display connection lines, wherein said plurality of filters is carried by said circuit board.