Display With Rear Side Capacitive Touch Sensing

• US 20120212445A1
• Filed: 02/23/2011
• Published: 08/23/2012
• Est. Priority Date: 02/23/2011
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Heikkinen, Marko K., Antila, Mika, Melakari, Klaus, Salmela, Markku
• Application Number:
  US13/032,915
• Publication Number:
  US 20120212445A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 1/1626 with a single-body enclosure integrating a flat display, e.g. Personal Digital Assistants [PDAs]
• CPC Class Codes: G06F 1/1643 the display being associated to a digitizer, e.g. laptops that can be used as penpads details related to the relative motion of the display enclosure with respect to the body enclosure, e.g. to move between laptop and tablet PC configuration G06F1/1615
• CPC Class Codes: G06F 3/0443 using a single layer of sensing electrodes

Abstract

An apparatus including an electronic display having an electrical display section located behind a front window. A capacitive touch sensor located behind the electrical display section. The electrical display section is configured to display information to a user at the front window. The capacitive touch sensor is configured to sense presence of a finger of the user at the front window.

Claims

1. An apparatus comprising:

an electronic display having an electrical display section located behind a front window, where the electrical display section is configured to display information to a user at the front window; and

a capacitive touch sensor located behind the electrical display section, where the capacitive touch sensor is configured to sense presence of a finger of the user at the front window.

2. An apparatus as in claim 1 where the capacitive touch sensor is located on a back side of the electronic display.

3. An apparatus as in claim 2 where the electronic display comprises the front window as a top member and a substantially rigid base member, where the electrical display section is located between the top member and the base member, and where a rear side of the base member forms the back side of the electronic display.

4. An apparatus as in claim 1 comprising means, connected to the electronic display and located behind the electrical display section, for sensing touch of the finger on the apparatus.

5. An apparatus as in claim 1 where the electronic display is flexible.

6. An apparatus as in claim 1 where the apparatus further comprises a force sensor configured to sense force applied by the finger at the front window.

7. An apparatus as in claim 1 where the capacitive touch sensor comprises a printed wiring board behind the electronic display section.

8. An apparatus as in claim 7 where the capacitive touch sensor comprises electrical conductors forming touch sensor wires on the printed wiring board.

9. An apparatus as in claim 7 where the printed wiring board comprises a flexible printed wiring board.

10. An apparatus as in claim 1 where the capacitive touch sensor extends beyond at least one side edge of the electronic display to sense the presence of the finger beyond the at least one side edge of the electronic display.

11. An apparatus as in claim 1 where the capacitive touch sensor is at least partially non-planar.

12. An apparatus as in claim 1 where the electronic display is at least partially curved.

13. An apparatus as in claim 1 where the electrical display section comprises an organic light emitting diode, and the capacitive touch sensor is located behind the organic light emitting diode.

14. A method comprising:

providing an electronic display having a front side and a back side, where the electronic display is configured to display information to a user at the front side; and

connecting a capacitive touch sensor to the display at the back side of the display, where the capacitive touch sensor is configured to sense presence of a finger of the user at the front side of the display.

15. A method as in claim 14 where the step of providing the electronic display comprises providing the electronic display with a front window as a top member which is substantially rigid.

16. A method as in claim 14 where the step of providing the electronic display comprises providing the electronic display with as a flexible electronic display.

17. A method as in claim 14 further comprising connecting a force sensor to the electronic display, where the force sensor is configured to sense force applied by the finger at the front window.

18. A method as in claim 14 where the step of connecting the capacitive touch sensor to the display comprises the capacitive touch sensor comprising a printed wiring board, where the printed wiring board is attached against the back side of the display.

19. A method as in claim 14 where the step of connecting the capacitive touch sensor to the display comprises the capacitive touch sensor comprising electrical conductors forming touch sensor wires on the printed wiring board, where the sensor wires are placed against the back side of the display.

20. A method as in claim 14 where the step of connecting the capacitive touch sensor to the display comprises the capacitive touch sensor extending beyond at least one side edge of the electronic display to sense the presence of the finger beyond the at least one side edge of the electronic display.

21. A method as in claim 14 further comprising bending the electronic display and capacitive touch sensor together.

22. A method as in claim 14 where the step of providing the electronic display comprises providing the electronic display with an organic light emitting diode, and the capacitive touch sensor is connected to the display behind the organic light emitting diode.

23. A method comprising:

when a user positions a finger at a front side of an electronic display, sensing presence of the finger by a capacitive touch sensor located at a back side of the electronic display; and

sending an electrical signal by the capacitive touch sensor based upon the sensed presence of the finger.