Touch display driving integrated circuit and operation method thereof

• US 10,429,993 B2
• Filed: 01/02/2018
• Issued: 10/01/2019
• Est. Priority Date: 03/24/2017
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lin, Chia Ching, Kim, Jaeyoon
• Primary Examiner(s): Johnson, Gerald
• Application Number:
  US15/860,007
• Publication Number:
  US 20180275827A1
• Time in Patent Office: 637 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 1/3262 Power saving in digitizer or tablet
• CPC Class Codes: G06F 2203/04104 Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/041661 using detection at multiple resolutions, e.g. coarse and fine scanning; using detection within a limited area, e.g. object tracking window
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2330/023 using energy recovery or conservation
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

A touch display driving integrated circuit (TDDIC) is configured to control a touch display panel. The TDDIC includes a touch driving circuit that performs a touch scan operation on the touch display panel, and a display driving circuit that performs a display operation on the touch display panel. The touch driving circuit operates in a first operation mode having a first touch scan frequency, and operates in a second operation mode having a second touch scan frequency different from the first touch scan frequency when a touch is detected from the touch display panel in the first operation mode.

Claims

1. A touch display driving integrated circuit configured to control a touch display panel, comprising:

a touch driving circuit configured to perform a touch scan operation on the touch display panel; and

a display driving circuit configured to perform a display operation on the touch display panel,

wherein the touch driving circuit is configured to,

operate in a first operation mode having a first touch scan frequency; and

operate in a second operation mode having a second touch scan frequency different from the first touch scan frequency when a first touch is detected from the touch display panel in the first operation mode.

wherein the touch driving circuit performs the touch scan operation in a vertical blank period of a first cycle of a vertical synchronization signal in the first operation mode.

2. The touch display driving integrated circuit of claim 1, wherein each of the first and second touch scan frequencies indicates a number of times the touch scan operation is performed per second on touch electrodes in the touch display panel.

3. The touch display driving integrated circuit of claim 1, wherein the second touch scan frequency is higher than the first touch scan frequency.

4. The touch display driving integrated circuit of claim 1, wherein the touch driving circuit performs the touch scan operation during the first cycle of the vertical synchronization signal in the second operation mode, and the display driving circuit performs the display operation during the first cycle of the vertical synchronization signal in the second operation mode,

wherein the display operation includes a plurality of sub display operations and the touch scan operation includes a plurality of sub touch scan operations,

wherein the touch driving circuit and the display driving circuit are configured to alternately perform the plurality of sub display operations and the plurality of sub touch scan operations in the second operation mode.

5. The touch display driving integrated circuit of claim 4, wherein each of the plurality of sub display operations is associated with some of pixels in the touch display panel, and

wherein each of the plurality of sub touch scan operations is associated with some of touch electrodes in the touch display panel.

6. The touch display driving integrated circuit of claim 1, wherein the touch driving circuit is configured to not provide information of the first touch to an external device while operating in the first operation mode and the touch driving circuit is configured to provide information of a second touch to the external device while operating in the second operation mode.

7. The touch display driving integrated circuit of claim 1, wherein the touch driving circuit is configured to operate in the first operation mode when a second touch is not detected during a reference time while operating in the second operation mode.

8. The touch display driving integrated circuit of claim 1, wherein the touch driving circuit is configured to operate in the second operation mode when the detected touch is not a multi-touch and to operate in a third operation mode when the detected touch is a multi-touch, the third operation mode having a third touch scan frequency higher than the second touch scan frequency.

9. The touch display driving integrated circuit of claim 1, wherein the touch display panel is an in-cell type touch display panel.

20. The touch display driving integrated circuit of claim 1, wherein if the touch driving circuit is operated under a specific condition state, the touch driving circuit is configured to perform the touch scan operation based on the first operation mode regardless of detecting the first touch in the first operation mode, and

the specific condition state includes at least one of a state performing a specific application, a state preventing a touch-detection, or a low-power state.

10. A method of operating a touch display driving integrated circuit configured to control a touch display panel, the method comprising:

operating in a first operation mode, the operating in the first operation mode including,

performing a touch scan operation in a vertical blank period of a vertical synchronization signal, and

detecting a touch in the first operation mode; and

operating in a second operation mode, the operating in the second operation mode including,

alternately performing a plurality of sub display operations and a plurality of sub touch scan operations during a cycle of the vertical synchronization signal, in response to the detected touch.

11. The method of claim 10, wherein each of the plurality of sub display operations is associated with some of pixels in the touch display panel, and

each of the plurality of sub touch scan operations is associated with some of touch electrodes in the touch display panel.

12. The method of claim 10, wherein a touch scan frequency of the first operation mode is lower than a touch scan frequency of the second operation mode.

13. The method of claim 12, wherein each of the touch scan frequencies of the first and second operation modes indicates a number of times of the touch scan operation is performed per second on touch electrodes in the touch display panel.

14. The method of claim 10, further comprising:

operating in the first operation mode when a touch is not detected during a reference time while operating in the second operation mode.

15. A touch display device comprising:

a display panel having a plurality of pixels and a plurality of touch electrodes; and

a driving integrated circuit configured to operate in a first touch scan mode having a first touch scan frequency to detect a touch of a user in the first touch scan mode,

wherein the driving integrated circuit is further configured to operate in a second touch scan mode when the detected touch is not a multi-touch and operate to in a third touch scan mode when the detected touch is a multi-touch, the second touch scan mode having a second touch scan frequency higher than the first touch scan frequency and the third touch scan mode having a third scan frequency higher than the second touch scan frequency.

16. The touch display device of claim 15, wherein the display panel is an in-cell touch display panel.

17. The touch display device of claim 16, wherein the driving integrated circuit is configured to perform a display operation during one display period and perform a touch operation during one touch period after performing the one display period in the first touch scan mode, the one display period and the one touch period being equal to or less than one frame length,

the driving integrated circuit configured to perform the display operation over a plurality of display sub-periods and perform the touch operation over a plurality of touch sub-periods, the plurality of display sub-periods and the plurality of touch sub-periods being intermingled, and

the frame length is a period of a vertical synchronization signal.

18. The touch display device of claim 17, wherein driving integrated circuit is configured to apply a common voltage to the touch electrodes to perform the display operation based on the common voltage and apply a touch sensing signal to detect the touch based on the touch sensing signal.

19. The touch display device of claim 15, wherein the driving integrated circuit is configured to perform the touch operation in every other frame.