Multiple row receiving line pattern for in-cell touchscreen panels

Patent metadata

Field	Value
Publication number	US-9244560-B2
Application number	US-201313862562-A
Country	US
Kind code	B2
Filing date	Apr 15, 2013
Priority date	Apr 15, 2013
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

An in-cell touchscreen panel includes columns of transmit electrodes and rows of sensing electrodes, wherein each row of sensing electrodes comprises a first subset of sensing electrodes coupled to control circuitry via a first subset of receiving traces and a second subset of sensing electrodes coupled to the control circuitry via a second subset of receiving traces. To enable multi-touch functionality, the in-cell touchscreen panel operates in a scanning mode where capacitance is measured at each node where the sensing electrodes intersect the transmit electrodes. During the scanning mode, the control circuitry senses the first and second subsets of receiving traces while applying drive signals to pairs of transmit electrodes. After a drive signal has been applied to each of the transmit electrodes, each of the nodes are measured to detect a capacitance. This capacitance is indicative of a user touch on the in-cell touchscreen panel.

First claim

What is claimed is:

1. A touchscreen panel, comprising:
a plurality of transmit electrodes with each transmit electrode extending in a first direction along a display portion of the touchscreen panel;
one or more rows of sensing electrodes extending in a second direction along the display portion of the touchscreen panel substantially perpendicular to the first direction and intersecting the plurality of transmit electrodes, each row of sensing electrodes comprising a first subset of sensing electrodes coupled to a first subset of receiving traces and a second subset of sensing electrodes coupled to a second subset of receiving traces; and
control circuitry configured to apply drive signals simultaneously to the transmit electrodes of each pair of a plurality of pairs of transmit electrodes, wherein a first transmit electrode in every pair of transmit electrodes intersects the first subset of sensing electrodes but not the second subset of sensing electrodes and a second transmit electrode in every pair of transmit electrodes intersects the second subset of sensing electrodes but not the first subset of sensing electrodes.

2. The in cell touchscreen panel of claim 1 , further comprising a plurality of transmit traces, each coupled to one of the transmit electrodes and operable to couple the transmit electrodes to the control circuitry.

3. The touchscreen panel of claim 1 , wherein the control circuitry is further operable to receive:
first sense signals from the first subset of sensing electrodes, and
second sense signals from the second subset of sensing electrodes.

4. The touchscreen panel of claim 3 , wherein the first sense signals are indicative of sensed capacitance at locations where the first subset of sensing electrodes intersect the first transmit electrode, and the second sense signals are indicative of sensed capacitance at locations where the second subset of sensing electrodes intersect the second transmit electrode.

5. The in cell touchscreen panel of claim 1 , wherein one or more of the sensing electrodes comprise a mesh defining a plurality of openings.

6. The touchscreen panel of claim 5 , wherein the mesh overlies pixels comprising the display portion of the touchscreen panel such that individual ones of the pixels are each positioned at one of a plurality of openings in the mesh.

7. The touchscreen panel of claim 5 , wherein the mesh is disposed between adjacent pixels comprising the display portion of the touchscreen panel.

8. A touchscreen panel, comprising:
a plurality of pairs of transmit electrodes, each pair of transmit electrodes comprising a first transmit electrode extending in a first direction along a display portion of the touchscreen panel and a second transmit electrode extending in the first direction along the display portion of the touchscreen panel;
one or more rows of sensing electrodes extending in a second direction along the display portion of the touchscreen panel substantially perpendicular to the first direction and intersecting the pairs of transmit electrodes, each row of sensing electrodes comprising a first subset of sensing electrodes each intersecting one of the first transmit electrodes of each pair of the plurality of pairs but not the second transmit electrode in that pair and a second subset of sensing electrodes each intersecting one of the second transmit electrodes of each pair of the plurality of pairs but not the first transmit electrode in that pair; and
control circuitry configured to apply drive signals simultaneously to each pair of the plurality of pairs of transmit electrodes.

9. The in cell touchscreen panel of claim 8 , wherein the control circuitry is further configured to receive first sense signals from the first subset of sensing electrodes and second sense signals from the second subset of sensing electrodes.

10. The touchscreen panel of claim 9 , wherein the first sense signals are indicative of sensed capacitance at locations where the first subset of sensing electrodes intersect the first transmit electrode of said pair of transmit electrodes, and the second sense signals are indicative of sensed capacitance at locations where the second subset of sensing electrodes intersect the second transmit electrode of said pair of transmit electrodes.

11. The touchscreen panel of claim 8 , further comprising a plurality of transmit traces, each coupled to one of the transmit electrodes and operable to couple the transmit electrodes to the control circuitry.

12. The touchscreen panel of claim 8 , wherein one or more of the sensing electrodes comprise a mesh defining a plurality of openings.

13. The touchscreen panel of claim 12 , wherein the mesh overlies pixels comprising the display portion of the touchscreen panel such that individual ones of the pixels are each positioned at one of a plurality of openings in the mesh.

14. The touchscreen panel of claim 12 , wherein the mesh is disposed between adjacent pixels comprising the display portion of the touchscreen panel.

15. A method for detecting a user touch using a touchscreen panel, the method comprising:
receiving sensing signals via a plurality of receiving traces, wherein a first subset of the receiving traces are coupled to first sensing electrodes in rows extending in a first direction along a display portion of the in cell touchscreen panel and a second subset of the receiving traces are coupled to second sensing electrodes in the rows extending in the first direction along the display portion of the in cell touchscreen panel;
applying drive signals simultaneously to transmit electrodes of each pair of a plurality of pairs of transmit electrodes extending in a second direction along the display portion of the touchscreen panel perpendicular to the first direction, wherein a first transmit electrode in every pair of transmit electrodes intersects first sensing electrodes of the first subset of receiving traces but does not intersect the second sensing electrodes, and a second transmit electrode in every the pair of transmit electrodes intersects second sensing electrodes of the second subset of receiving traces but does not intersect the first sensing electrodes; and
measuring a capacitance formed at nodes where one or more of the first sensing electrodes intersect the first transmit electrode and at nodes where one or more of the second sensing electrodes intersect the second transmit electrode.

16. The method of claim 15 , further comprising applying a drive signal to a single transmit electrode extending in the second direction and measuring a capacitance formed at nodes where one or more of the first sensing electrodes intersect the single transmit electrode.

17. The method of claim 15 , wherein receiving sensing signals comprises receiving first sense signals via the first subset of the receiving traces and receiving second sense signals via the second subset of the receiving traces.

18. The method of claim 17 , wherein the first sense signals are indicative of the capacitance formed at the nodes where the one or more of the first sensing electrodes intersect the first transmit electrode of said pair of transmit electrodes, and the second sense signals are indicative of the capacitance formed at the nodes where the one or more of the second sensing electrodes intersect the second transmit electrode of said pair of transmit electrodes.

Assignees

• St Microelectronics Asia
• St Microelectronics Asia

Inventors

• Ningrat Kusuma Adi

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F2203/04112

  Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G06F3/0446

  using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes · CPC title