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

• US 8,064,963 B2
• Filed: 12/03/2007
• Issued: 11/22/2011
• Est. Priority Date: 08/31/2004
• Status: Active Grant

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: Robinson, James, Mankaruse, George, Jarmuszewski, Perry, George, Liviu, Zhu, Lizhong, Corrigan, Michael, Drader, Marc
• Primary Examiner(s): MEHRPOUR, NAGHMEH
• Application Number:
  US11/949,289
• Publication Number:
  US 20080076482A1
• Time in Patent Office: 1,450 Days
• Field of Search: 455/566, 455/575.1, 455/550.1, 455/90.3, 455/68.1, 455/403, 455/556.2, 455/425, 455/88, 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. A mobile wireless communications device comprising:

a housing;

a plurality of circuit boards carried by the housing and including radio frequency (RF) circuitry and a processor carried by at least one of the circuit boards and operative with each other;

a display connector mounted on at least one of the circuit boards and adapted to be connected to a display;

display connection lines carried by at least one of the circuit boards as uninterrupted signal traces formed planar on at least one of the circuit boards and interconnecting the display connector and the processor for carrying signals from the processor for display on a display connected to the display connector; and

filters carried by the at least one circuit board, wherein a filter is connected serially into each display connection line for reducing any interfering energy from the processor and a display into the display connection lines.

2. The mobile wireless communications device according to claim 1, and further comprising an antenna circuit board mounted within the housing and an antenna carried by the antenna circuit board and operative with the RF circuitry.

3. The mobile wireless communications device according to claim 1, and further comprising a keyboard circuit board mounted within the housing and a keypad carried by the keyboard circuit board.

4. The mobile wireless communications device according to claim 1, and further comprising a main circuit board on which the RF circuitry and processor are mounted.

5. The mobile wireless communications device according to claim 1, and further comprising a liquid crystal display (LCD) carried by the housing, an LCD connector mounted on one of the circuit boards and connected to the LCD, and parallel LCD connection lines carried by at least one of the circuit boards and interconnecting the LCD connector and the processor for carrying signals from the processor to the LCD for display thereon.

6. The mobile wireless communications device according to claim 1, and further comprising a bypass capacitor connected to ground and into respective display connection lines.

7. The mobile wireless communications device according to claim 1, wherein each filter comprises a ferrite inductor.

8. The mobile wireless communications device according to claim 1, wherein each filter comprises an LC filter serially connected into each display connection line.

9. The mobile wireless communications device according to claim 1, wherein said housing is configured for handheld operation.

10. The mobile wireless communications device according to claim 1, wherein said RF circuitry and processor are operative as a cellular communications device.

11. The mobile wireless communications device according to claim 1, wherein said filters form a plurality of arrays of LC filters serially connected into said display connection lines.

12. The mobile wireless communications device according to claim 1, and further comprising a voltage regulator circuit operatively connected to said filters wherein said RF circuitry and processor are operative as a wireless local area network (WLAN) device.

13. The mobile wireless communications device according to claim 1, and further comprising a second filter element connected into each display connection line and serially connected to each other filter within said display connection line.

14. The mobile wireless communications device according to claim 13, wherein said second filter element comprises an inductor.

15. A method for making a mobile wireless communications device, which comprises:

providing a housing, a plurality of circuit boards carried by the housing, radio frequency (RF) circuitry and a processor carried by at least one of the circuit boards and operative with each other, a display connector carried on one of the circuit boards and adapted to be connected to a display, and display connection lines carried by at least one of the circuit boards as uninterrupted signal traces formed planar on the circuit board and operatively connected to the processor and the display connector for carrying signals from the processor to the display connector to be displayed on a display connected thereto; and

reducing interfering energy from the processor and a display into the display connection lines by connecting an electromagnetic interference (EMI) filter serially into each display connection line.

16. The method according to claim 15, which further comprises providing an antenna circuit board and mounting an antenna on the antenna circuit board.

17. The method according to claim 15, which further comprises connecting to display connection lines a bypass capacitor that is connected to ground.

18. The method according to claim 15, which further comprises connecting an LC filter into each display connection line.