Touch display driving integrated circuit, operation method of the same, and touch display device including the same

Patent metadata

Field	Value
Publication number	US-10474281-B2
Application number	US-201715426228-A
Country	US
Kind code	B2
Filing date	Feb 7, 2017
Priority date	Feb 24, 2016
Publication date	Nov 12, 2019
Grant date	Nov 12, 2019

Abstract

A touch display driving integrated circuit (IC) includes a touch driver IC configured to be connected to touch electrodes through touch sensing lines and provide a sensing signal to first touch sensing lines among the touch sensing lines in a touch period. The touch driver IC is further configured to apply a common voltage to second touch sensing lines among the touch sensing lines and apply a voltage different from the common voltage to third touch sensing lines different from the second touch sensing lines in a display period.

First claim

What is claimed is:

1. A touch display driving integrated circuit (IC) repeatedly providing a plurality of display periods and a plurality of touch periods in each cycle of a vertical synchronization signal, the touch display driving IC comprising:
a touch driver IC connected to touch electrodes through touch sensing lines, the touch driver IC being configured to:
in a touch period, provide a sensing signal to first touch sensing lines among the touch sensing lines and a first voltage to second touch sensing lines different from the first touch sensing lines among the touch sensing lines, and
in a display period immediately following the touch period, apply a common voltage to the second touch sensing lines and apply a second voltage to the first touch sensing lines; and
a source driver IC configured to be connected to pixels through data lines, and to provide a data signal to the data lines in the display period immediately following the touch period,
wherein the first voltage and the second voltage are a same voltage and are one of a ground voltage, a floating voltage, and a specific voltage different from the common voltage.

2. The touch display driving IC as set forth in claim 1 , wherein each of the first and second voltages is the ground voltage.

3. The touch display driving IC as set forth in claim 1 , wherein each of the first and second voltages is the floating voltage.

4. The touch display driving IC as set forth in claim 1 , wherein the touch driver IC is further configured to sense variation of the sensing signal provided to the first touch sensing lines and detect a touch with first touch electrodes connected to the first touch sensing lines in the touch period based on the sensed variation.

5. The touch display driving IC as set forth in claim 1 , wherein the source driver IC is further configured to provide the data signal to first pixels among the pixels through the data lines in the display period.

6. The touch display driving IC as set forth in claim 5 , wherein second touch electrodes connected to the second touch sensing lines are operated as common electrodes for the first pixels in the display period.

7. The touch display driving IC as set forth in claim 1 , wherein the source driver IC is further configured to provide the sensing signal to the data lines in the touch period.

8. The touch display driving IC as set forth in claim 1 , wherein the touch driver IC comprises:
a control logic circuit configured to generate a switching signal; and
a switching circuit connected to the touch sensing lines, and configured to switch among a common voltage node providing the common voltage, a ground voltage node, and touch sensing circuits in response to the switching signal.

9. The touch display driving IC as set forth in claim 8 , wherein the switching circuit is further configured to connect each of the touch sensing lines to one of the common voltage node, the ground voltage node, and the touch sensing circuits in response to the switching signal.

10. The touch display driving IC as set forth in claim 1 , further comprising:
a gate driver IC configured to be respectively connected to the pixels through gate lines,
wherein the gate driver IC provides the sensing signal to the gate lines in the touch period and provides gate signals to the gate lines in the display period.

11. An operation method of a touch display driving integrated circuit (IC) configured to be connected to touch electrodes through touch sensing lines and to be connected to pixels through data lines, the touch signal driving IC repeatedly providing a plurality of display periods and a plurality of touch periods in each cycle of a vertical synchronization signal, the operation method comprising:
providing a sensing signal to first touch sensing lines among the touch sensing lines and a first voltage to second touch sensing lines different from the first touch sensing lines among the touch sensing lines to perform a touch scan operation in a touch period;
applying a common voltage to the second touch sensing lines and a second voltage to the first touch sensing lines in a display period immediately following the touch period;
providing a data signal to the data lines in the display period immediately following the touch period,
wherein the first voltage and the second voltage are a same voltage and are one of a ground voltage, a floating voltage, and a specific voltage different from the common voltage.

12. The operation method as set forth in claim 11 , wherein each of the first and second voltages is the ground voltage.

13. The operation method as set forth in claim 11 ,
wherein each of the first and second voltages is the floating voltage.

14. The operation method as set forth in claim 11 , further comprising
performing the touch scan operation to sense variation of the sensing signal provided to the first touch sensing lines; and
determining a touch with first touch electrodes respectively connected to the first touch sensing lines based on the sensed variation.

15. The operation method as set forth in claim 11 , further comprising:
providing the sensing signal to the data lines in the touch period.

16. A touch display device comprising:
a display panel including a plurality of touch electrodes and a plurality of pixels;
a touch driver integrated circuit (IC) connected to the plurality of touch electrodes through touch sensing lines and repeatedly providing a plurality of display periods and a plurality of touch periods in each cycle of a vertical synchronization signal,
wherein the touch driver IC is configured to:
in a touch period, perform a touch scan operation on first touch electrodes among the plurality of touch electrodes and provide a first voltage to second touch electrodes different from the first touch electrodes among the plurality of touch electrodes, and
in a display period immediately following the touch period, apply a common voltage to the second touch electrodes and apply a second voltage to the first touch electrodes; and
a source driver IC configured to be connected to the plurality of pixels through data lines, and to provide a data signal to the data lines in the display period immediately following the touch period,
wherein the first voltage and the second voltage are a same voltage and are one of a ground voltage, a floating voltage, and a specific voltage different from the common voltage.

17. The touch display device as set forth in claim 16 , further comprising:
a gate driver IC connected to the plurality of pixels through gate lines.

18. The touch display device as set forth in claim 17 , wherein the touch driver IC, the gate driver IC, and the source driver IC are included in a single semiconductor chip.

19. The touch display device as set forth in claim 17 , wherein in the display period, first pixels among the plurality of pixels compare voltages of corresponding data line among the data lines with the common voltage of the second touch electrodes, and display image information based on a result of the comparison.

20. The touch display device as set forth in claim 16 , wherein the display panel is an in-cell display panel.

Assignees

• Samsung Electronics Co Ltd

Inventors

• PARK Haewoon
• Baek Seung-Hoon
• Jeong Jaehun
• Kwon Hyeokchul

Classifications

• G09G3/20

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044

  by capacitive means · CPC title

• G06F3/04184

  Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally · CPC title