Method of driving touch sensing display panel and display apparatus for performing the same

• US 9,316,856 B2
• Filed: 01/11/2012
• Issued: 04/19/2016
• Est. Priority Date: 07/07/2011
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Park, Dong-Won, You, Bong-Hyun, Bae, Jae-Sung, Lee, Sang-Je
• Primary Examiner(s): Hoffner, Linh N
• Application Number:
  US13/348,516
• Publication Number:
  US 20130009888A1
• Time in Patent Office: 1,560 Days
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13312 Circuits comprising photodetectors for purposes other than feedback
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• 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: G06F 3/0421 by interrupting or reflecting a light beam, e.g. optical touch-screen
• CPC Class Codes: G09G 2310/02 Addressing, scanning or driving the display screen or processing steps related thereto
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 3/3674 Details of drivers for scan electrodes

Abstract

In a method of driving touch sensing display panel and a display apparatus for performing the method, image data are outputted to the touch sensing display panel during an active period of a frame, the touch sensing display panel comprising a display substrate including a switching element connected to a data line extending in a column direction and a gate line extending in a row direction, and a touch sensing substrate including a light sensing part connected to a read-out line substantially parallel to the data line and a scan line substantially parallel to the gate line. A sensing signal is read out through the read-out line during a blanking period of the frame.

Claims

1. A method of driving a touch sensing display panel, the method comprising:

outputting image data to the touch sensing display panel during an active period of a frame, the touch sensing display panel comprising a display substrate including a switching element connected to a data line extending in a column direction and a gate line extending in a row direction, and a touch sensing substrate including a light sensing part connected to a read-out line substantially parallel to the data line and a scan line substantially parallel to the gate line; and

reading out a sensing signal through the read-out line during a blanking period of the frame,

wherein reading out the sensing signal comprises;

outputting an odd-numbered scan signal during the blanking period of an N-th frame (N is a natural number); and

outputting an even-numbered scan signal during the blanking period of an (N+1)-th frame.

2. The method of claim 1, wherein the light sensing part includes a first light sensing element sensing a first light and a second light sensing element sensing a second light and the touch sensing substrate includes a light sensor row in which a plurality of light sensing parts is arranged in a row, and

at least one light sensor row receives a substantially same scan signal.

3. The method of claim 2, wherein the odd-numbered scan signal is provided to the light sensing parts included in the first light sensor row and a second light sensor row adjacent to the first light sensor row, and

the even-numbered scan signal is provided to the light sensing parts included in a third light sensor row adjacent to the second light sensor row and a fourth light sensor row adjacent to the third light sensor row.

4. A method of driving a touch sensing display panel, the method comprising:

providing image data to a data line of a touch sensing display panel during an active period of a frame;

reading out a sensing signal sensed by a light sensing part of the touch sensing display panel on a read-out line during the active period of the frame; and

removing coupling noise included in the sensing signal based on a coupling value preset corresponding to the image data, wherein the coupling value corresponds to measured optical and electrical coupling noise between the data line and the read-out line for a grayscale of the image data,

wherein the coupling value is stored as a look-up table (LUT) according to grayscales of the image data.

5. The method of claim 4, wherein reading out the sensing signal comprises:

providing the scan signal to the scan line by one frame period using a progressive scan mode.

6. The method of claim 5, wherein the light sensing part includes a first light sensing element sensing a first light and a second light sensing element sensing a second light and the touch sensing substrate includes a light sensor row in which a plurality of light sensing parts is arranged in a row, and

at least one light sensor row receives a substantially same scan signal.

7. The method of claim 6, wherein the light sensing parts included in a first light sensor row, a second light sensor row adjacent to the first light sensor row, a third light sensor row adjacent to the second light sensor row and a fourth light sensor row adjacent to the third light sensor row receives the substantially same scan signal.

8. A display apparatus comprising:

a touch sensing display panel comprising a display substrate that includes a switching element connected to a data line extending in a column direction and a gate line extending in a row direction, and a touch sensing substrate that includes a light sensing part connected to a read-out line substantially parallel to the data line and a scan line substantially parallel to the gate line;

a data driving part outputting image data to the touch sensing display panel during an active period of a frame;

a read-out driving part reading out a sensing signal through the read-out line during a blanking period of the frame;

a timing control part generating a timing control signal based on a master clock signal;

a sensing control part generating a sensing control signal based on the timing control signal; and

a scan driving part outputting an odd-numbered scan signal during the blanking period of an N-th frame (N is a natural number), and outputting an even-numbered scan signal during the blanking period of an (N+1)-th frame.

9. The display apparatus of claim 8, wherein the touch sensing display panel includes a light sensor row in which a plurality of light sensing parts is arranged in a row, and

the scan driving part provides a substantially same scan signal to at least one light sensor row.

10. The display apparatus of claim 9, wherein the light sensing part comprises:

a first driving element connected to a first read-out line and a first scan line;

a first light sensing element connected to a first bias line adjacent to the first read-out line and the first driving element, and sensing a first light;

a second driving element connected to a second read-out line and a second scan line; and

a second light sensing element connected to a second bias line adjacent to the first bias line and the second driving element, and sensing a second light.

11. A display apparatus comprising:

a touch sensing display panel comprising a display substrate that includes a switching element connected to a data line extending in a column direction and a gate line extending in a row direction, and a touch sensing substrate that includes a light sensing part connected to a read-out line substantially parallel to the data line and a scan line substantially parallel to the gate line;

a data driving part outputting image data to the touch sensing display panel during an active period of a frame;

a read-out driving part reading out a sensing signal through the read-out line during a blanking period of the frame;

a sensing control part removing coupling noise included in the sensing signal based on a coupling value preset corresponding to the image data, wherein the coupling value corresponds to measured optical and electrical coupling noise between the data line and the read-out line for a grayscale of the image data; and

a look-up table (LUT) storing the coupling value according to grayscales of the image data.

12. The display apparatus of claim 11, further comprising:

a timing control part generating a timing control signal based on a master clock signal and including a memory storing the image data.

13. The display apparatus of claim 11, wherein the scan driving part provides a scan signal to the scan line by one frame period using a progressive scan mode.

14. The display apparatus of claim 13, wherein the touch sensing display panel includes a light sensor row in which a plurality of light sensing parts is arranged in a row, and

the scan driving part provides a substantially same scan signal to at least one light sensor row.

15. The display apparatus of claim 14, wherein the light sensing part comprises:

a first driving element connected to a first read-out line and a first scan line;

a first light sensing element connected to a first bias line adjacent to the first read-out line and the first driving element, and sensing a first light;

a second driving element connected to a second read-out line and a second scan line; and

a second light sensing element connected to a second bias line adjacent to the first bias line and the second driving element, and sensing a second light.