Touch display driving integrated circuit and operation method thereof

Patent metadata

Field	Value
Publication number	US-2018024677-A1
Application number	US-201715637635-A
Country	US
Kind code	A1
Filing date	Jun 29, 2017
Priority date	Jul 20, 2016
Publication date	Jan 25, 2018
Grant date	—

Abstract

An operating method of a touch display driving integrated circuit that is connected with a touch display panel through touch sensing lines and data lines is provided. The method includes applying a common voltage to each touch sensing line, increasing voltages of the touch sensing lines and the data lines by a predetermined level, providing a first touch sensing signal to each touch sensing line, and sensing a touch of a user based on signal variations of the touch sensing lines.

First claim

1 . An operating method of a touch display driving integrated circuit that is configured to be connected with a touch display panel through touch sensing lines and data lines, the method comprising:
applying a common voltage to each touch sensing line; increasing voltages of the touch sensing lines and the data lines by a predetermined level; providing a first touch sensing signal to each touch sensing line; and sensing a touch of a user based on signal variations of the touch sensing lines.

2 . The method of claim 1 , wherein the increasing of the voltages comprises:
increasing a voltage of each touch sensing line from the common voltage to a first voltage; and increasing a voltage of each data line from a ground voltage to a second voltage.

3 . The method of claim 2 , wherein a difference between the common voltage and the first voltage is the same as a difference between the ground voltage and the second voltage.

4 . The method of claim 2 , wherein the common voltage is a negative voltage and the first voltage is the ground voltage.

5 . The method of claim 2 , wherein the providing of the first touch sensing signal to each touch sensing line comprises:
providing each data line with a second touch sensing signal of which a voltage level is higher by the predetermined level than that of the first touch sensing signal.

6 . The method of claim 1 , further comprising:
providing a data signal to each data line while the common voltage is applied to each touch sensing line.

7 . The method of claim 1 , further comprising:
decreasing voltages of the touch sensing lines and the data lines by the predetermined level after completing determining whether the touch of the user is made, based on the signal variations of the touch sensing lines.

8 . The method of claim 1 , wherein the touch display driving integrated circuit is configured to be connected with the touch display panel through the touch sensing lines, the data lines, and gate lines, the method further comprising:
providing a gate voltage to the touch display panel, wherein the increasing of the voltages comprises: increasing voltages of the gate lines by the predetermined level.

9 . The method of claim 1 , wherein the touch display driving integrated circuit is connected with touch electrodes of the touch display panel through the touch sensing lines and is connected with pixels of the touch display panel through the data lines.

10 . The method of claim 9 , wherein the touch electrodes are used as common electrodes of the pixels while the common voltage is applied to each touch electrode.

11 . A touch display driving integrated circuit comprising:
a touch driver connected to touch electrodes through touch sensing lines to provide a common voltage to each touch sensing line during a display period and to provide a first touch sensing signal to each touch sensing line during a touch period; a transition voltage controller configured to output a first output voltage during the display period and to output a second output voltage higher by a predetermined level than the first output voltage during a transition period from the display period to the touch period; and a source driver connected with pixels through data lines to provide a data signal to each data line during the display period and to provide the second output voltage to each data line during the transition period.

12 . The touch display driving integrated circuit of claim 11 , wherein the touch driver is configured to increase a voltage of each touch sensing line from the common voltage to a first voltage during the transition period, and
wherein the source driver is configured to increase a voltage of each data line from a ground voltage to a second voltage based on the second output voltage during the transition period.

13 . The touch display driving integrated circuit of claim 12 , further comprising:
a gate driver configured to generate a gate voltage based on the first and second output voltages.

14 . The touch display driving integrated circuit of claim 11 , wherein the source driver is configured to provide a second touch sensing signal, of which a voltage level is higher by the predetermined level than that of the first touch sensing signal, to each data line in the touch period.

15 . The touch display driving integrated circuit of claim 11 , wherein the transition voltage controller comprises:
a first switch configured to connect a first node and a ground voltage; a second switch configured to connect a node of the output voltage and the ground voltage; a third switch configured to connect a second node and the common voltage; a fourth switch configured to connect the second node and the first voltage; a fifth switch configured to connect the second node and a node for receiving the touch sensing signal from the touch driver; a capacitor connected between the first node and the second node; and a buffer connected between the first node and the node of the output voltage.

16 . The touch display driving integrated circuit of claim 15 , wherein during the display period, the first to third switches are in a turn-on state and the fourth and fifth switches are in a turn-off state,
wherein during the transition period, the fourth switch is in a turn-on state and the first, second, third, and fifth switches are in a turn-off state, and wherein during the touch period, the fifth switch is in a turn-on state and the first, second, third, and fourth switches are in a turn-off state.

17 . The touch display driving integrated circuit of claim 11 , further comprising:
a common voltage generator configured to generate the common voltage; and a stabilization capacitor connected with the common voltage generator.

18 . A touch display device comprising:
a touch display panel including a touch electrode and a pixel; and a touch display driving integrated circuit configured to control the touch display panel, wherein the touch display driving integrated circuit comprises: a touch driver connected with the touch electrode through a touch sensing line to apply a common voltage to the touch sensing line during a display period and to provide a first touch sensing signal to the touch sensing line during a touch period; a transition voltage controller configured to output a first output voltage during the display period and to output a second output voltage higher by a predetermined level than the first output voltage during a transition period from the display period to the touch period; and a source driver connected with the pixel through a data line to provide a data signal to the data line during the display period and to provide the second output voltage to the data line during the transition period.

19 . The touch display device of claim 18 , wherein the touch driver is configured to increase a voltage of the touch sensing line from the common voltage to a first voltage during the transition period.

20 . The touch display device of claim 18 , wherein during the touch period, the transition voltage controller outputs a second touch sensing signal of which a voltage level is higher by the predetermined level than that of the first touch sensing signal and the source driver provides the second touch sensing signal to the data line.

21 - 26 . (canceled)

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Minsung
• Jeong Jaehun
• PARK Haewoon
• Baek Seung-Hoon
• Byun San-Ho
• Kim Jinbong
• Choi Yoonkyung

Classifications

• G09G3/3275

  Details of drivers for data electrodes · CPC title

• G09G3/3655

  Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title

• G09G2310/0264

  Details of driving circuits · CPC title

• G09G3/3648

  using an active matrix (G09G3/367 - G09G3/3696 take precedence) · CPC title