Touch sensing display device for sensing different touches using one driving signal

• US 9,552,113 B2
• Filed: 07/23/2014
• Issued: 01/24/2017
• Est. Priority Date: 08/14/2013
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, In Cheol, Lee, Yoon Gyu, Nam, Seung Ho, Hong, Won-Ki, Hwang, Seong Mo
• Primary Examiner(s): Park, Sanghyuk
• Application Number:
  US14/338,842
• Publication Number:
  US 20150049049A1
• Time in Patent Office: 916 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04106 Multi-sensing digitiser, i.e. digitiser using at least two different sensing technologies simultaneously or alternatively, e.g. for detecting pen and finger, for saving power or for improving position detection
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G06F 3/0446 using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
• CPC Class Codes: G06F 3/046 by electromagnetic means

Abstract

A touch sensing display device includes: a display panel; a capacitive touch panel disposed on a front surface of the display panel; a digitizer disposed on a surface of the display panel; a sensor driving unit which sequentially applies scanning signals to the capacitive touch panel and the digitizer, where each of the scanning signal is applied simultaneously to the capacitive touch panel and the digitizer; and a sensing unit which senses sensing signals of the capacitive touch panel and the digitizer, in which the sensing unit receives the sensing signal of the capacitive touch panel and the sensing signal of the digitizer at different times.

Claims

1. A touch sensing display device comprising:

a display panel;

a capacitive touch panel disposed on a front surface of the display panel;

a digitizer disposed on a surface of the display panel;

a sensor driving unit which applies same scanning signals simultaneously to the capacitive touch panel and the digitizer; and

a sensing unit which senses a sensing signal of the capacitive touch panel and a sensing signal of the digitizer,

wherein the sensing unit receives the sensing signal of the capacitive touch panel and the sensing signal of the digitizer at different times,

wherein each of the scanning signals is applied during a scanning signal application period, and a blank period is between two consecutive scanning signal application periods,

wherein the sensing signal of the capacitive touch panel is transferred to the sensing unit during the scanning signal application period, and

wherein the sensing signal of the digitizer is transferred to the sensing unit during the blank period.

2. The touch sensing display device of claim 1, wherein

the touch sensing display device comprises only one sensing unit.

3. The touch sensing display device of claim 1, further comprising:

a scanning signal line which extends substantially in a predetermined direction and transmits the scanning signals; and

a sensing signal line which extends substantially in a direction substantially vertical to the scanning signal line and transmits the sensing signal of the capacitive touch panel or the sensing signal of the digitizer.

4. The touch sensing display device of claim 1, wherein

the sensing unit comprises a first sensing unit part and a second sensing unit part,

the sensing signal of the capacitive touch panel is transferred to the first sensing unit part, and

the sensing signal of the digitizer is transferred to the second sensing unit part.

5. The touch sensing display device of claim 4, further comprising:

a scanning signal line which extends substantially in a predetermined direction and transmits the scanning signals;

a sensing signal line which extends substantially in a direction substantially vertical to the scanning signal line,

wherein

the first sensing unit is connected to the sensing signal line, and

the second sensing unit is connected to the scanning signal line.

6. The touch sensing display device of claim 5, further comprising:

a switch unit which controls a connection between the second sensing unit and the scanning signal line and a connection between the sensor driving unit and the scanning signal line.

7. The touch sensing display device of claim 1, further comprising:

a pen which electromagnetically resonates with the scanning signals to enable the digitizer to sense a position of the pen.

8. The touch sensing display device of claim 7, wherein

the pen comprises a resonance circuit unit and controls the resonance circuit unit to allow the sensing signal of the digitizer to be generated during the blank period.

9. The touch sensing display device of claim 1, further comprising:

a window which is disposed on a front surface of the capacitive touch panel.

10. The touch sensing display device of claim 1, further comprising:

an integrated sensing panel in which the capacitive touch panel and the digitizer are integrally disposed.

11. The touch sensing display device of claim 10, wherein

the integrated sensing panel comprises:

a scanning signal line which is disposed substantially in a horizontal direction and has quadrangular loop structures, a side of which is opened; and

a sensing signal line which extends substantially in a vertical direction and comprises sensing signal electrodes having bent structures, wherein each bent structure is disposed at a left side and a lower side of a corresponding quadrangular loop structure of the quadrangular loop structures.

12. The touch sensing display device of claim 11, wherein

the quadrangular loop structures of the scanning signal line are arranged substantially in the horizontal direction and electrically connected to each other, and

the bent structures of the sensing signal electrodes are arranged substantially in the vertical direction and electrically connected to each other.

13. The touch sensing display device of claim 12, wherein

a capacitive touch is sensed at a portion at which the scanning signal line and the sensing signal line overlap each other.

14. The touch sensing display device of claim 13, wherein

each of the scanning signals is applied during a scanning signal application period, and

a blank period is between two consecutive scanning signal application periods.