ELECTRONIC DEVICE AND TOUCH SCREEN DISPLAY

• US 20090189875A1
• Filed: 01/29/2008
• Published: 07/30/2009
• Est. Priority Date: 01/29/2008
• Status: Abandoned Application

• Current Assignee: Malikie Innovations Limited (Key Patent Innovations Limited)
• Original Assignee: Blackberry Limited
• Inventors: MA, ZhongMing
• Application Number:
  US12/021,503
• Publication Number:
  US 20090189875A1
• Time in Patent Office: Days
• US Class Current: 345/174
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact

Abstract

A touch screen display includes a display device, a resistive touch-sensitive overlay disposed on the display device and including a pair of touch-sensor layers separated by a gap, a resistive touch screen controller connected to each of the pair of touch-sensor layers for determining a position of a touch event on the touch-sensitive overlay and a capacitive controller connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling with the outer one of the pair of touch-sensor layers.

Claims

1. A touch screen display comprising:

a display device;

a resistive touch-sensitive overlay disposed on the display device and comprising a pair of touch-sensor layers separated by a gap;

a resistive touch screen control component connected to each of the pair of touch-sensor layers for determining a position of a touch event on the touch-sensitive overlay; and

a capacitive control component connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling with the outer one of the pair of touch-sensor layers.

2. The touch screen display according to claim 1, wherein the resistive touch screen control component comprises a resistive touch screen controller and the capacitive control component comprises a capacitive controller.

3. The touch screen display according to claim 1, further comprising a host processor connected to the resistive touch screen control component and the capacitive control component

4. The touch screen display according to claim 1, wherein the pair of touch-sensor layers comprise layers of Indium Tin Oxide (ITO), each disposed on a respective substrate.

5. The touch screen display according to claim 1, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal the resistive touch-sensitive overlay.

6. The touch screen display according to claim 1, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal but spaced from the resistive touch-sensitive overlay by an air gap.

7. The touch screen display according to claim 1, wherein an outer touch surface comprises a protective cover layer disposed on the outer one of the touch-sensor layers.

8. The touch screen display according to claim 1, wherein the resistive touch-sensitive overlay comprises a 4-wire resistive touch-sensitive overlay.

9. The touch screen display according to claim 1, wherein the resistive touch-sensitive overlay comprises a 5-wire resistive touch-sensitive overlay.

10. An electronic device comprising:

a base;

a resistive touch screen display connected to the base and comprising a display device and a resistive touch-sensitive overlay disposed on the display device; and

operational components between the base and the touch screen display, the operational components comprising a resistive touch screen control component connected to each of a pair of touch-sensor layers of the touch-sensitive overlay, a capacitive control component connected to an outer one of the pair of touch-sensor layers for receiving input for determining changes resulting from capacitive coupling, and a processor connected to the resistive touch screen control component and the capacitive control component and the display device for providing a graphical user interface.

11. The electronic device according to claim 10, wherein the resistive touch screen control component comprises a resistive touch screen controller and the capacitive control component comprises a capacitive controller.

12. The electronic device according to claim 10, wherein the pair of touch-sensor layers comprise layers of Indium Tin Oxide (ITO), each disposed on a respective substrate.

13. The electronic device according to claim 10, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal the resistive touch-sensitive overlay.

14. The electronic device according to claim 10, wherein the outer one of the pair of touch-sensor circuit layers and the capacitive control component are configured to determine capacitive changes resulting from a conductive object proximal but spaced from the resistive touch-sensitive overlay by an air gap.

15. The electronic device according to claim 10, wherein an outer touch surface comprises a protective cover layer disposed on the outer one of the touch-sensor layers.

16. The electronic device according to claim 10, wherein the resistive touch-sensitive overlay comprises a 4-wire resistive touch-sensitive overlay.

17. The electronic device according to claim 10, wherein the resistive touch-sensitive overlay comprises a 5-wire resistive touch-sensitive overlay.

18. A method of controlling an electronic device having a resistive touch screen display, the method comprising:

determining an object is proximal the touch screen display as a result of capacitive coupling between the object and an outer touch-sensor layer of the touch screen display; and

effecting a change in the output of the portable electronic device in response to determining the object is proximal the touch screen display.

19. The method according to claim 18, wherein effecting the change in the output comprises changing an output displayed on the resistive touch screen display.

20. The method according to claim 18, wherein said determining comprises determining the object is proximal the touch screen display when the object is spaced from the touch screen display by an air gap.