Touch sensor device and display device including the same

Patent metadata

Field	Value
Publication number	US-9733761-B2
Application number	US-201514854532-A
Country	US
Kind code	B2
Filing date	Sep 15, 2015
Priority date	Jan 6, 2015
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A touch sensor device includes first electrode patterns arranged in a first direction and physically separated first electrode cells; second electrode patterns arranged in a second direction crossing the first direction and includes physically separated second electrode cells; first touch signal lines connected to the first electrode cells; second touch signal lines connected to the second electrode cells; and a touch sensor controller connected with the first touch signal lines and the second touch signal lines. The first electrode cell and the second electrode cell adjacent in the first direction form a channel for generating position information by a mutual capacitive method. The touch sensor controller stores a ghost table including a ghost ratio for each channel for a touch position, and removes a ghost from measured touch data by using the ghost table to generate final touch data.

First claim

What is claimed is:

1. A touch sensor device, comprising:
a plurality of columns, each column extending in a first direction and comprising:
first electrode patterns comprising physically separated first electrodes;
second electrode patterns comprising physically separated second electrodes;
first touch signal lines electrically connected to the first electrodes;
second touch signal lines electrically connected to the second electrodes; and

a touch sensor controller electrically connected with the first touch signal lines and the second touch signal lines,
wherein:
the first electrode patterns, the second electrode patterns, the first touch signal lines, and the second touch signal lines are disposed on the same layer;
a first electrode of the first electrodes and a second electrode of the second electrodes adjacent to each other in a second direction crossing the first direction and disposed in a same column form a channel for generating position information by a mutual capacitive method;
the touch sensor controller is configured to store a ghost table comprising a ghost ratio for each channel for a touch position for each column, and is further configured to remove a ghost from measured touch data by using the ghost table to generate final touch data; and
the ghost is generated between adjacent columns of the plurality of columns.

2. The touch sensor device of claim 1 , wherein:
the ghost is generated by a mutual capacitance between a second touch signal line of a first column among the plurality of columns and one selected from a first electrode and a first touch signal line of a second column adjacent to the first column.

3. The touch sensor device of claim 1 , wherein:
the ghost table further comprises a ghost ratio for each channel for a touch position for each column.

4. The touch sensor device of claim 1 , wherein:
the ghost table further comprises a representative ghost ratio for a touch position for each column.

5. The touch sensor device of claim 4 , wherein:
the representative ghost ratio is an average value of the ghost ratios for each channel for the touch position.

6. The touch sensor device of claim 1 , wherein:
the ghost table comprises a first representative ghost ratio and a second representative ghost ratio for a touch position for each column.

7. The touch sensor device of claim 6 , wherein:
the first representative ghost ratio is an average value of the ghost ratios, the average value of the ghost ratios being equal to or larger than an average ghost ratio, the average ghost ratio being an average of the ghost ratios for each channel for the touch position, and
the second representative ghost ratio is an average value of the ghost ratios smaller than the average ghost ratio.

8. The touch sensor device of claim 1 , wherein:
the touch sensor controller is disposed at any one side of an upper end and a lower end of a touch panel on which the first electrode patterns and the second electrode patterns are disposed.

9. The touch sensor device of claim 8 , wherein:
the touch sensor controller is configured to apply a detection input signal to the second touch signal lines, and is configured to obtain measured touch data for all of the channels by receiving a detection output signal from the first touch signal lines.

10. The touch sensor device of claim 9 , wherein:
the measured touch data comprises a variation amount of mutual capacitance for each channel.

11. The touch sensor device of claim 9 , wherein:
the touch sensor controller is configured to confirm a channel value of each channel in the measured touch data, and is configured to detect a channel having a channel value equal to or larger than a threshold value as a touch position.

12. The touch sensor device of claim 11 , wherein:
the touch sensor controller is configured to sequentially search for a touch position from a lower side to an upper side of the touch panel.

13. The touch sensor device of claim 11 , wherein:
the touch sensor controller is configured to sequentially search for a touch position from an upper side to a lower side of the touch panel.

14. The touch sensor device of claim 11 , wherein:
the touch sensor controller is configured to confirm a ghost ratio for each channel for the touch position, calculate a ghost value by multiplying the channel value of the touch position by the ghost ratio for each channel, and subtract the ghost value from the channel value of each channel to remove a ghost.

15. A display device, comprising:
a display panel configured to display an image in a display area;
a plurality of columns, each column extending in a first direction and comprising:
first electrode patterns disposed in a touch area overlapping the display area, and comprising physically separated first electrodes;
second electrode patterns arranged in the touch area and comprising physically separated second electrodes;
first touch signal lines electrically connected to the first electrodes; and
second touch signal lines electrically connected to the second electrodes; and

a touch sensor controller electrically connected with the first touch signal lines and the second touch signal lines,
wherein:
the first electrode patterns, the second electrode patterns, the first touch signal lines, and the second touch signal lines are disposed on the same layer;
a first electrode of the first electrodes and a second electrode of the second electrodes adjacent to each other in a second direction crossing the first direction and disposed in a same column form a channel for generating position information by a mutual capacitive method;
the touch sensor controller is configured to store a ghost table comprising a ghost ratio for each channel for a touch position for each column, and is further configured to remove a ghost from measured touch data by using the ghost table to generate final touch data; and
the ghost is generated between adjacent columns of the plurality of columns.

16. The display device of claim 15 , wherein:
the ghost is generated by a mutual capacitance between a second touch signal line of a first column among the plurality of columns and one selected from a first electrode and a first touch signal line of a second column adjacent to the first column.

17. The display device of claim 15 , wherein:
the ghost table further comprises a ghost ratio for each channel for a touch position for each column.

18. The display device of claim 17 , wherein:
the touch sensor controller is configured to apply a detection input signal to the second touch signal lines, and is configured to obtain measured touch data for all of the channels by receiving a detection output signal from the first touch signal lines.

19. The display device of claim 18 , wherein:
the touch sensor controller is configured to confirm a channel value of each channel in the measured touch data, and is further configured to detect a channel having a channel value equal to or larger than a threshold value as a touch position.

20. The display device of claim 19 , wherein:
the touch sensor controller is configured to confirm a ghost ratio for each channel for the touch position, calculate a ghost value by multiplying the channel value of the touch position by the ghost ratio for each channel, and subtract the ghost value from the channel value of each channel to remove a ghost.

Assignees

• Samsung Display Co Ltd

Inventors

• Ku Ja Seung
• Kamal Hassan
• Shin Ji Hye
• Ahn Soon Sung

Classifications

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/0418 Primary

  for error correction or compensation, e.g. based on parallax, calibration or alignment · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/04186

  Touch location disambiguation · CPC title