Touch display device and method for driving the same

• US 10,303,275 B2
• Filed: 09/09/2014
• Issued: 05/28/2019
• Est. Priority Date: 09/27/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Oh, Dae-Seok, Lee, Ju-Young, Seo, Bo-Gun, Kim, Hak-Su, Park, Yong-Hwa
• Primary Examiner(s): Nguyen, Chanh D
• Assistant Examiner(s): Truong, Nguyen H
• Application Number:
  US14/480,866
• Publication Number:
  US 20150091826A1
• Time in Patent Office: 1,722 Days
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• 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 3/044 by capacitive means
• CPC Class Codes: G09G 2310/0227 related to multiple interlacing, i.e. involving more fields than just one odd field and one even field
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2340/0435 Change or adaptation of the frame rate of the video stream
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/2096 Details of the interface to the display terminal specific for a flat panel suitable for both CRT and flat panel G09G5/006; specific for a CRT G09G1/167

Abstract

A touch display device includes a touch display panel for displaying an image corresponding to a touch applied from outside the touch display device, a gate driver for sequentially driving all gate lines of the touch display panel once during a unit field period including at least two continuous field periods, in such a manner that a total gate driving period corresponding to a sum of individual gate driving periods of all gate lines is shorter than the unit field period, and a touch control unit for defining periods of the unit field period other than the total gate driving period, as a touch sensing period, and performing an operation for sensing a touch on the touch display panel during the touch sensing period.

Claims

1. A touch display device, comprising:

a touch display panel for displaying an image corresponding to a touch applied from outside the touch display device, the touch display panel including a plurality of touch blocks, each having a touch sensor;

a gate driver for sequentially driving all gate lines GL1 to GLi (i is a natural number greater than or equal to

     4) of the touch display panel once during a unit field period comprising k continuous field periods (k is a natural number greater than or equal to

     2) in sequence from a first field period to a (k)th field period, i being a multiple of k and greater than or equal to 2*k; and

a touch controller configured to define periods of the unit field period other than gate driving periods as touch sensing periods, and to apply touch pulses to the touch blocks to sense a touch on the touch display panel during the touch sensing periods,

wherein the gate driver is configured to sequentially drive (k*n+1)th gate lines (n is a natural number from 0 to the largest natural number less than i/k) during respective gate driving periods within the first field period, and to sequentially drive (k*n+m)th gate lines (m is a natural number from 2 to k corresponding to a second field period to the (k)th field period, respectively) during respective gate driving periods within a respective (m)th field period, and

wherein one of the gate driving periods within the first field period is separated from a next one of the gate driving periods within the first field period by an interval having a length of two or more horizontal periods.

2. The touch display device according to claim 1, wherein the touch controller defines periods of the first field period other than the gate driving periods in which the (k*n+1)th gate lines are driven, and periods of the respective (m)th field period other than gate driving periods in which the (k*n+m)th gate lines are driven, as the touch sensing periods.

3. The touch display device of claim 1, wherein the touch controller is configured to perform a touch sensing operation only during the touch sensing periods without performing the touch sensing operation during the gate driving periods of the first field period or of the respective (m)th field period.

4. The touch display device of claim 1, wherein one of the gate driving periods within the respective (m)th field period is separated from a next one of the gate driving periods within the respective (m)th field period by an interval having a length of two or more horizontal periods.

5. The touch display device of claim 1, wherein the interval having a length of two or more horizontal periods is one of the touch sensing periods.

6. The touch display device of claim 1, wherein i is greater than or equal to 8, and k is greater than or equal to 4.

7. A touch display device, comprising:

a touch display panel for displaying an image corresponding to a touch applied from outside the touch display device, the touch display panel including a plurality of touch blocks, each having a touch sensor;

a gate driver for sequentially driving all gate lines GL1 to GLi (i is a natural number greater than or equal to

     4) of the touch display panel once during a unit field period comprising k continuous field periods (k is an even number greater than or equal to

     2) in sequence from a first field period to a (k)th field period, i being a multiple of k and greater than or equal to 2*k; and

a touch controller configured to define periods of the unit field period other than gate driving periods as touch sensing periods, and to apply touch pulses to the touch blocks to sense a touch on the touch display panel during the touch sensing periods,

wherein the gate driver sequentially drives ((k/2)*n+1)th gate lines (n is a natural number from 0 to the largest natural number less than i/(k/2)) during respective gate driving periods within the first field period, drives no gate line during each even field period, and sequentially drives ((k/2)*n+((m+1)/2))th gate lines (m is an odd number corresponding to an odd field period and less than or equal to (k−

1)) during respective gate driving periods within a (m)th field period,

wherein one of the gate driving periods within the first field period is separated from a next one of the gate driving periods within the first field period by an interval having a length of two or more horizontal periods, and

wherein the touch controller defines periods of the first field period other than the gate driving periods in which the ((k/2)*n+1)th gate lines are driven, each even field period, and periods of the (m)th field period other than the gate driving periods in which the ((k/2)*n+((m+1)/2))th gate lines are driven, as the touch sensing periods.

8. The touch display device of claim 7, wherein the touch controller is configured to perform a touch sensing operation only during the touch sensing periods without performing the touch sensing operation during the gate driving periods of the first field period or of the respective (m)th field period.

9. The touch display device of claim 7, wherein one of the gate driving periods within the (m)th field period is separated from a next one of the gate driving periods within the (m)th field period by an interval having a length of two or more horizontal periods.

10. The touch display device of claim 7, wherein the interval having a length of two or more horizontal periods is one of the touch sensing periods.

11. The touch display device of claim 7, wherein i is greater than or equal to 8, and k is greater than or equal to 4.