Display device and method of driving the same

• US 9,805,690 B2
• Filed: 11/10/2014
• Issued: 10/31/2017
• Est. Priority Date: 12/10/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kang, Seong Kyu, Kim, Hoon Bae, Han, Sung Su
• Primary Examiner(s): Edwards, Carolyn R
• Application Number:
  US14/537,526
• Publication Number:
  US 20150161963A1
• Time in Patent Office: 1,086 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 3/044 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: G09G 5/006 Details of the interface to the display terminal specific for a display terminal using a CRT G09G1/167; using a flat panel G09G3/2096; circuits for interfacing with colour displays G09G5/04

Abstract

A disclosed display device includes a touch panel including s number of receiving electrodes and k number of driving electrodes which are formed to intersect the receiving electrodes, k being less than s and larger than 2, the touch panel provided in an in-cell type. The display device further includes a touch sensing unit configured to respectively supply a first driving voltage and a second driving voltage to an nth driving electrode and an (n+1)th driving electrode, which are adjacent to each other among the driving electrodes, to determine whether the nth driving electrode is touched, n being a natural number which is more than one and less than k, the touch sensing unit further configured to respectively supply the first driving voltage and the second driving voltage to a kth driving electrode and a (k−1)th driving electrode to determine whether the kth driving electrode is touched.

Claims

1. A display device comprising:

a touch panel including s number of receiving electrodes and k number of driving electrodes which are formed to intersect the receiving electrodes, k being less than s and larger than 2, the touch panel provided in an in-cell type; and

a touch sensing unit configured to (i) supply a first driving voltage to an nth driving electrode and (ii) supply a second driving voltage different from the first driving voltage to an (n+1)th driving electrode while the first driving voltage is supplied to the nth driving electrode, the nth driving electrode and the (n+1) driving electrode being adjacent to each other among the driving electrodes, to determine whether the nth driving electrode is touched, n being a natural number which is more than one and less than k, the touch sensing unit further configured to (i) supply the first driving voltage to a kth driving electrode and (ii) supply the second driving voltage to a (k−

1)th driving electrode while the first driving voltage is supplied to the kth driving electrode to determine whether the kth driving electrode is touched.

2. The display device of claim 1, wherein the driving electrodes are formed in parallel with a plurality of gate lines formed in the touch panel.

3. The display device of claim 1, wherein,

during a touch sensing period from a first touch sensing period to a (k−

1)th touch sensing period included in one frame period, the touch sensing unit respectively supplies the first driving voltage and the second driving voltage to the nth driving electrode and the (n+1)th driving electrode which are adjacent to each other, and determines whether the nth driving electrode is touched, by using a plurality of sensing signals received from the receiving electrodes, and

during a kth touch sensing period, the touch sensing unit supplies the first driving voltage to the kth driving electrode, supplies the second driving voltage to the (k−

1)th driving electrode, and determines whether the kth driving electrode is touched, by using the plurality of sensing signals received from the receiving electrodes.

4. A display device comprising:

a touch panel including a first touch electrode group in which s number of receiving electrodes and k number of driving electrodes are formed to intersect each other and a second touch electrode group in which s number of other receiving electrodes and (k+1)th to (2k)th driving electrodes are formed to intersect each other, k being less than s, the touch panel provided in an in-cell type, the receiving electrodes in the first touch electrode group electrically disconnected from said other receiving electrodes in the second touch electrode group; and

a touch sensing unit configured to (i) supply a first driving voltage to an nth driving electrode of the first touch electrode group and (ii) supply a second driving voltage different from the first driving voltage to an (n+1)th driving electrode of the first touch electrode group while the first driving voltage is supplied to the nth driving electrode of the first touch electrode group to determine whether the nth driving electrode of the first touch electrode group is touched, n being a natural number less than k, the touch sensing unit further configured to (i) supply the first driving voltage to a kth driving electrode of the first touch electrode group and (ii) supply the second driving voltage to a (k+1)th driving electrode of the second touch electrode group while the first driving voltage is supplied to the kth driving electrode of the first touch electrode group to determine whether the kth driving electrode of the first touch electrode group is touched.

5. The display device of claim 4, wherein the receiving electrodes are formed in parallel with a plurality of gate lines formed in the touch panel.

6. The display device of claim 4, wherein,

during a touch sensing period from a first touch sensing period to a (k−

1)th touch sensing period included in one frame period, the touch sensing unit respectively supplies the first driving voltage and the second driving voltage to the nth driving electrode and the (n+1)th driving electrode which are adjacent to each other in each of the first and second touch electrode groups, determines whether the nth driving electrode in the first touch electrode group is touched by using a plurality of sensing signals received from the receiving electrodes in the first touch electrode group, and determines whether the nth driving electrode in the second touch electrode group is touched by using a plurality of sensing signals received from said other receiving electrodes in the second touch electrode group, and

during at least one touch sensing period subsequent to a kth touch sensing period among a plurality of touch sensing periods included in one frame period, the touch sensing unit respectively supplies the first driving voltage and the second driving voltage to the kth driving electrode configuring the first touch electrode group and the (k+1)th driving electrode configuring the second touch electrode group to determine whether the kth driving electrode is touched, by using the plurality of sensing signals received from the receiving electrodes in the first touch electrode group and said other receiving electrodes in the second touch electrode group.

7. The display device of claim 6, wherein during at least one touch sensing period subsequent to the kth touch sensing period, the touch sensing unit respectively supplies the second driving voltage and the first driving voltage to the kth driving electrode and the (k+1)th driving electrode to determine whether the kth driving electrode is touched, by using the plurality of sensing signals received from the receiving electrodes in the first touch electrode group and said other receiving electrodes in the second touch electrode group.

8. The display device of claim 4, wherein during at least one touch sensing period subsequent to a kth touch sensing period among a plurality of touch sensing periods included in one frame period, the touch sensing unit respectively supplies the first driving voltage and the second driving voltage to the (2k)th driving electrode configuring the second touch electrode group and a (2k−

1)th driving electrode configuring the second touch electrode group to determine whether the (2k)th driving electrode is touched, by using a plurality of sensing signals received from said other receiving electrodes in the second touch electrode group.

9. A method of driving a display device, the method comprising:

supplying a first driving voltage to an nth driving electrode and supplying a second driving voltage different from the first driving voltage to an (n+1)th driving electrode while the first driving voltage is supplied to the nth driving electrode, the nth driving electrode and the (n+1) driving electrode being adjacent to each other among k number of driving electrodes which are formed to intersect s number of receiving electrodes, which are formed in a touch panel which is provided in an in-cell type in a panel, to determine whether the nth driving electrode is touched, k being less than s and larger than 2, n being a natural number which is more than one and less than k; and

supplying the first driving voltage to a kth driving electrode and supplying the second driving voltage to a (k−

1)th driving electrode while the first driving voltage is supplied to the kth driving electrode to determine whether the kth driving electrode is touched.

10. A method of driving a display device, the method comprising:

supplying a first driving voltage to an nth driving electrode and supplying a second driving voltage different from the first driving voltage to an (n+1)th driving electrode while the first driving voltage is supplied to the nth driving electrode, the nth driving electrode and the (n+1) driving electrode being adjacent to each other in each of a first touch electrode group and a second touch electrode group, the first touch electrode group having s number of receiving electrodes and k number of driving electrodes to intersect each other which are formed in a touch panel, k being less than s and n being a natural number less than k, and the second touch electrode group having s number of other receiving electrodes and (k+1)th to (2k)th driving electrodes to intersect each other in the touch panel, the receiving electrodes in the first touch electrode group electrically disconnected from said other receiving electrodes in the second touch electrode group; and

supplying the first driving voltage to a kth driving electrode of the first touch electrode group and supplying the second driving voltage to a (k+1)th driving electrode of the second touch electrode group while the first driving voltage is supplied to the kth driving electrode of the first touch electrode group to determine whether the kth driving electrode of the first touch electrode group is touched.

11. A display device comprising:

a touch panel including receiving electrodes and driving electrodes including at least a first driving electrode, a second driving electrode, and a third driving electrode, the receiving electrodes intersecting the first, second, and third driving electrodes; and

a touch sensing unit configured to;

(i) supply a first driving voltage to the first driving electrode and (ii) supply a second driving voltage different from the first driving voltage to the second driving electrode while the first driving voltage is supplied to the first driving voltage to determine whether the first driving electrode is touched, the second driving electrode being adjacent to the first driving electrode,

(i) supply the first driving voltage to the second driving electrode and (ii) supply the second driving voltage to the third driving electrode while the first driving voltage is supplied to the second driving electrode to determine whether the second driving electrode is touched, the third driving electrode being adjacent to the second driving electrode, and

(i) supply the first driving voltage to the third driving electrode and (ii) supply the second driving voltage to the second driving electrode while the first driving voltage is supplied to the third driving electrode to determine whether the third driving electrode is touched.

12. The display device of claim 11, wherein the third driving electrode is positioned nearest to an edge of the touch panel among the driving electrodes.

13. The display device of claim 11, wherein:

the touch panel includes first receiving electrodes and second receiving electrodes electrically disconnected from the first receiving electrodes,

the touch panel further includes a fourth driving electrode and a fifth driving electrode, the fourth driving electrode intersecting with the first receiving electrodes and the fifth driving electrode intersecting with the second receiving electrodes, and

the touch sensing unit is further configured to (i) supply the first driving voltage to the fourth driving electrode and (ii) supply the second driving voltage to the fifth driving electrode while the first driving voltage is supplied to the fourth driving electrode for a first measurement to determine whether the fourth driving electrode is touched, the fifth driving electrode adjacent to the fourth driving electrode.

14. The display device of claim 13, wherein the touch sensing unit is further configured to (i) supply the second driving voltage to the fourth driving electrode and (ii) supply the first driving voltage to the fifth driving electrode while the second driving voltage is supplied to the fourth driving electrode for a second measurement, the first measurement and the second measurement being combined to determine whether the fourth driving electrode is touched.

15. The display device of claim 13, wherein a number of driving electrodes intersecting the first receiving electrodes is equal to a number of driving electrodes intersecting the second receiving electrodes.

16. A method of driving a touch panel, the method comprising:

supplying a first driving voltage to a first driving electrode and supplying a second driving voltage different from the first driving voltage to a second driving electrode while the first driving voltage is supplied to the first driving electrode to determine whether the first driving electrode is touched, the second driving electrode being adjacent to the first driving electrode,

supplying the first driving voltage to the second driving electrode and supplying the second driving voltage to a third driving electrode while the first driving electrode is supplied to the second driving electrode to determine whether the second driving electrode is touched, the third driving electrode being adjacent to the second driving electrode, and

supplying the first driving voltage to the third driving electrode and supplying the second driving voltage to the second driving electrode while the first driving voltage is supplied to the third driving electrode to determine whether the third driving electrode is touched, the first, second and third driving electrodes intersecting receiving electrodes.

17. The method of claim 16, wherein the third driving electrode is positioned nearest to an edge of the touch panel among the driving electrodes.

18. The method of claim 16, further comprising:

supplying the first driving voltage to a fourth driving electrode and supplying the second driving voltage to a fifth driving electrode while the first driving voltage is supplied to the fourth driving electrode for a first measurement to determine whether the fourth driving electrode is touched, the fifth driving electrode adjacent to the fourth driving electrode, the fourth driving electrode intersecting first receiving electrodes and the fifth driving electrode intersecting second receiving electrodes.

19. The method of claim 18, further comprising:

supplying the second driving voltage to the fourth driving electrode and supplying the first driving voltage to the fifth driving electrode while the second driving voltage is supplied to the fourth driving electrode for a second measurement; and

determining whether the fourth driving electrode is touched based on the first measurement and the second measurement.

20. The method of claim 18, further comprising:

determining whether another driving electrode intersecting the first receiving electrodes is touched in a time period; and

determining whether at least one driving electrode intersecting the second receiving electrodes is touched in the time period.

21. The method of claim 18, wherein the first driving voltage and the second driving voltage have different phases.