Touch Display

• US 20120075197A1
• Filed: 09/23/2010
• Published: 03/29/2012
• Est. Priority Date: 09/23/2010
• Status: Abandoned Application

• Current Assignee: Nokia Corporation
• Original Assignee: Nokia Corporation
• Inventors: Nurmi, Juha Harri-Pekka
• Application Number:
  US12/889,378
• Publication Number:
  US 20120075197A1
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• 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 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally

Abstract

In an embodiment, a touch display has a plurality of pixel elements and touch sensor elements. The touch display further has a display driver circuitry containing a plurality of output channels each corresponding to a different row of pixel elements of the touch display, and a touch detection driver circuitry containing a plurality of input channels each corresponding to a different row of touch sensor elements. Further, the touch display has a plurality of common communication lines connected to a plurality of first separators. Each of the first separators is connected to a predetermined pixel element and to a predetermined touch sensor element. Each of the common communication lines is further connected to one of the output channels of the display driver and via a second separator to one of the input channels of the touch detection driver.

Claims

1. An apparatus comprising:

a touch display comprising a plurality of pixel elements and touch sensor elements;

a display driver circuitry comprising a plurality of output channels each corresponding to a different row of pixel elements of the touch display;

a touch detection driver circuitry comprising a plurality of input channels each corresponding to a different row of touch sensor elements;

a plurality of common communication lines connected to a plurality of first separators, each of the first separators being connected to a predetermined pixel element and to a predetermined touch sensor element;

each of the common communication lines being further connected to one of the output channels of the display driver and via a second separator to one of the input channels of the touch detection driver; and

wherein the output channels of the display driver circuitry are configured to provide different common communication lines with electric signals configured to enable separately for each of the common communication lines either communication between the output channel connected to the common communication line in question and one pixel element while separating with the first and second separators the input channel and touch sensor element from the common communication line in question, or between the input channel connected to the common communication line in question and one touch sensor element by causing the first and second separators to pass information.

2. The apparatus of claim 1, wherein the first separators comprise directional components configured to communicatively connect a pixel element or a touch sensor element with a corresponding common communication line depending on the polarity of voltage of the common communication line.

3. The apparatus of claim 2, wherein the directional components comprise one or more diodes.

4. The apparatus of claim 1, wherein the pixel elements and touch sensor elements that are connected to a common first separator correspond to different regions of the touch display.

5. The apparatus of claim 1, wherein the touch sensor elements are distributed such that each touch sensor element corresponds to a region of the touch display that covers a plurality of pixel elements.

6. The apparatus of claim 1, further comprising selection lines intersecting with the common communication lines.

7. The apparatus of claim 6, wherein each selection line communicatively connected with one column of pixel elements.

8. The apparatus of claim 6, further comprising a third separator configured to selectively activate one of plural columns of the pixel elements by electrically controlling the corresponding selection line.

9. The apparatus of claim 7, further comprising a third separator configured to selectively activate one of plural columns of the pixel elements by electrically controlling the corresponding selection line.

10. The apparatus of claim 8, wherein some of the selection lines are further communicatively connected to a column of touch sensor elements.

11. The apparatus of claim 6, wherein the selection lines and the common communication lines form a grid.

12. The apparatus of claim 7, wherein the selection lines and the common communication lines form a grid.

13. The apparatus of claim 8, wherein the selection lines and the common communication lines form a grid.

14. The apparatus of claim 1, wherein the number of pixel elements is higher than the number of the touch sensor elements.

15. The apparatus of claim 1, wherein a portion of the pixel elements is associated with dedicated pixel element communication lines to make such pixel elements accessible without first separators.

16. The apparatus of claim 15, wherein the pixel elements associated with dedicated pixel element communication lines are associated with common selection lines with the pixel elements and touch sensor elements that are multiplexed to operate over common communication lines.

17. The apparatus of claim 16, wherein the dedicated pixel element communication lines are operationally matched with the common communication lines.

18. The apparatus of claim 1, further configured to operate the touch sensor elements at a first rate and to operate the pixel elements at a second rate, wherein the first rate is different than the second rate.

19. A method comprising:

selectively connecting to one of plural common communication lines either one pixel element or touch sensor element of a touch display and one output channel of a display driver circuitry or one input channel of a touch detection driver circuitry, respectively, by providing said one common communication line with electrical signals adapted to cause said selective connecting; and

exchanging information over said common communication line between the selectively connected pixel element or touch sensor element and display driver circuitry or touch detection driver circuitry.

20. The method of claim 19, further comprising selectively activating one of plural columns of the pixel elements for access over said common communication line.