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

• US 8,244,306 B2
• Filed: 11/21/2011
• Issued: 08/14/2012
• Est. Priority Date: 08/31/2004
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Research In Motion Limited (Blackberry Limited)
• Inventors: Zhu, Lizhong, Corrigan, Michael, Jarmuszewski, Perry, George, Liviu, Mankaruse, George, Robinson, James, Drader, Marc
• Primary Examiner(s): Mehrpour, Melody
• Application Number:
  US13/300,776
• Publication Number:
  US 20120071209A1
• Time in Patent Office: 267 Days
• Field of Search: 455/566, 455/575.1, 455/550.1, 455/90.3, 455/66.1, 455/403, 455/556.2, 455/425, 455/88, 455/68.1, 379/387, 379/428, 379/433, 333181-186, 381/71, 381/318, 381/94
• US Class Current: 455/566
• 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 circuit board including display driver circuitry;

a display connector on said circuit board and coupled to said display;

display connection lines carried by said circuit board as signal traces interconnecting said display driver circuitry and said display connector; and

a plurality of filters carried by said circuit board, with each filter being coupled to a respective display connection line.

2. The electronic device according to claim 1 further comprising a respective bypass capacitor coupled into each display connection line and to ground.

3. The electronic device according to claim 1 wherein each filter comprises a ferrite inductor.

4. The electronic device according to claim 1 wherein each filter comprises an LC filter serially coupled into each display connection line.

5. The electronic device according to claim 1 further comprising a cellular transceiver and a processor carried by said circuit board.

6. The electronic device according to claim 1 further comprising a wireless local area network (WLAN) transceiver and a processor carried by said circuit board.

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

8. The electronic device according to claim 1 further comprising a respective second filter coupled into each display connection line.

9. The electronic device according to claim 8 wherein each of said second filters comprises an inductor.

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

11. An electronic device comprising:

an LCD display;

a circuit board including display driver circuitry;

a display connector on said circuit board and coupled to said LCD display;

display connection lines carried by said circuit board as signal traces interconnecting said display driver circuitry and said display connector; and

a plurality of filters carried by said circuit board, with each filter being serially coupled to a respective display connection line.

12. The electronic device according to claim 11 further comprising a respective bypass capacitor coupled into each display connection line and to ground.

13. The electronic device according to claim 11 wherein each filter comprises a ferrite inductor.

14. The electronic device according to claim 11 wherein each filter comprises an LC filter serially coupled into each display connection line.

15. The electronic device according to claim 11 further comprising a cellular transceiver and a processor carried by said circuit board.

16. The electronic device according to claim 11 further comprising a wireless local area network (WLAN) transceiver and a processor carried by said circuit board.

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

18. The electronic device according to claim 11 further comprising a respective second filter coupled into each display connection line.

19. The electronic device according to claim 18 wherein each of said second filters comprises an inductor.

20. A method for making an electronic device comprising:

providing a display;

forming a circuit board including display driver circuitry, a display connector, and display connection lines as signal traces interconnecting the display driver circuitry and the display connector; and

mounting a plurality of filters on the circuit board, with each filter being coupled to a respective display connection line.

21. The method according to claim 20 further comprising coupling a respective bypass capacitor into each display connection line and to ground.

22. The method according to claim 20 wherein each filter comprises a ferrite inductor.

23. The method according to claim 20 wherein each filter comprises an LC filter serially coupled into each display connection line.

24. The method according to claim 20 further comprising coupling a respective second filter into each display connection line.

25. The method according to claim 24 wherein each of the second filters comprises an inductor.