DISPLAY DEVICE HAVING TOUCH SENSORS AND DRIVING METHOD THEREOF

• US 20180004345A1
• Filed: 06/30/2017
• Published: 01/04/2018
• Est. Priority Date: 06/30/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: SHIN, Seungrok, LEE, Deuksu, KIM, Sangkyu, LEE, Jaegyun, KIM, Taeyun
• Granted Patent: US 10,331,266 B2
• Time in Patent Office: Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• 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: G06F 3/0443 using a single layer of sensing electrodes
• CPC Class Codes: G09G 2310/08 Details of timing specific for flat panels, other than clock recovery
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes
• CPC Class Codes: G09G 3/3677 suitable for active matrices only
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens

Abstract

A display device can include a display panel touch block groups, each including touch sensors, each touch sensor corresponds to one or more pixels defined by data lines and gate lines; a data driver that generates and supplies a modulated source signal for display data to a data line; a gate driver that generates a modulated scan-on signal for writing the modulated source signal to a pixel and supplies the modulated scan-on signal to the gate lines; and a touch sensor driver that supplies a touch driving signal to touch wires connected to corresponding touch sensors in each of the touch block groups, and selectively senses for touch on a touch block group, except for a restricted touch block group overlapping a gate line that is supplied with the modulated scan-on signal, in which the modulated source signal or the modulated scan-on signal is synchronized with the touch driving signal.

Claims

1. A display device having touch sensors, the display device comprising:

a display panel comprising a plurality of touch block groups, each touch block group among the plurality of touch block groups including a plurality of touch sensors, each touch sensor among the plurality of touch sensors corresponding to one or more pixels among a plurality of pixels defined by data lines and gate lines;

a data driver configured to generate a modulated source signal for displaying data and supplying the modulated source signal to a data line among the data lines;

a gate driver configured to generate a modulated scan-on signal for writing the modulated source signal to a pixel among the plurality of pixels and supply the modulated scan-on signal to the gate lines; and

a touch sensor driver configured to;

supply a touch driving signal to touch wires respectively connected to corresponding touch sensors in each of the plurality of touch block groups, and

selectively sense touch on at least one touch block group among the plurality of touch block groups, except for a restricted touch block group among the plurality of touch block groups,

wherein the restricted touch block group is a touch block group that overlaps with at least one gate line that is currently being supplied with the modulated scan-on signal, and

wherein the modulated source signal or the modulated scan-on signal is synchronized with the touch driving signal.

2. The display device of claim 1, wherein the gate driver supplies a modulated scan-off signal to other touch block groups among the plurality of touch block groups other than the restricted touch block group, and

wherein the modulated scan-off signal is synchronized with the touch driving signal and prevents the modulated source signal from being written to a corresponding pixel among the plurality of pixels.

3. The display device of claim 2, wherein the modulated source signal, the modulated scan-on signal, and the modulated scan-off signal have a same phase as the touch driving signal.

4. The display device of claim 1, further comprising a driving voltage supply part configured to generate a high-level driving voltage and a low-level driving voltage for driving the plurality of pixels, and supply the high-level driving voltage to a first driving voltage supply line and the low-level driving voltage to a second driving voltage supply line,

wherein the high-level driving voltage and the low-level driving voltage have a same phase as the touch driving signal.

5. The display device of claim 4, wherein the modulated source signal, the modulated scan-on signal, the modulated scan-off signal, the high-level driving voltage, and the low-level driving voltage are generated based a modulated ground signal having the same phase as the touch driving signal.

6. The display device of claim 5, wherein the modulated source signal is a signal generated by modulating a data voltage based on the modulated ground signal,

wherein the modulated scan-on signal is generated by modulating a scan-on gate signal of a gate high-voltage level based on the modulated ground signal,

wherein the modulated scan-off signal is generated by modulating a scan-off gate signal of a gate low-voltage level based on the modulated ground signal,

wherein the high-level driving voltage is generated by modulating a high-voltage power signal based on the modulated ground signal, and

wherein the low-level driving voltage is generated by modulating a low-voltage power signal based on the modulated ground signal.

7. The display device of claim 1, wherein the gate driver sequentially supplies the modulated scan-on signal to the gate lines corresponding to the plurality of touch block groups in a first direction, and the touch sensor driver selectively senses for touch on another touch block group among the plurality of touch block groups in the first direction or a second direction opposite to the first direction, and

wherein the another touch block line is a different touch block line than the restricted touch block group.

8. The display device of claim 1, wherein the gate driver sequentially supplies the modulated scan-on signal to the gate lines corresponding to the plurality of touch block groups in a first direction, and the touch sensor driver randomly senses for touch on another touch block group among the plurality of touch block groups, and

wherein the another touch block group is a different touch block group than the restricted touch block group.

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

a power supply part connected to a high-voltage power source through a first switch and a ground power source through a second switch, and configured to supply high-voltage power and ground power to the data driver, the gate driver, and a driving voltage supply part configured to generate a high-level driving voltage and a low-level driving voltage for driving the plurality of pixels;

a control part configured to turn on or off the first switch and the second switch and repetitively supply the high-voltage power and the ground power to the power supply part; and

a modulated ground signal generator configured to generate a modulated ground signal and supply the modulated ground signal to the data driver, the gate driver, and the driving voltage supply part,

wherein the modulated source signal, the modulated scan-on signal, the high-level driving voltage and the low-level driving voltage are generated based on the modulated grand signal.

10. The display device of claim 9, wherein the modulated ground signal supplied by the modulated ground signal generator to the data driver, the gate driver, and the driving voltage supply part is not continuously supplied during a frame period.

11. The display device of claim 9,

wherein the data driver includes an adder configured to output the modulated source signal by adding a source signal and the modulated ground signal,

wherein the gate driver includes an adder configured to output the modulated scan-on signal by adding a scan-on gate signal and the modulated ground signal and output the modulated scan-off signal by adding a scan-off gate signal and the modulated ground signal, and

wherein the driving voltage supply part includes an adder configured to output the high-level driving voltage by adding a high-level driving signal having a direct current (DC) voltage level and the modulated ground signal and output the low-level driving voltage by adding a low-level driving signal having a DC voltage level and the modulated ground signal.

12. A method of driving a display device having touch sensors, the method comprising:

supplying a modulated source signal for displaying data to a data line;

supplying a modulated scan-on signal to gate lines for writing the modulated source signal to a pixel among a plurality of pixels;

supplying a touch driving signal to touch wires respectively connected to corresponding touch sensors in a touch block group among a plurality of touch block groups, wherein each touch block group among the plurality of touch block groups includes a plurality of touch sensors that each correspond to one or more pixels among the plurality of pixels; and

selectively sensing touch on at least one touch block group among the plurality of touch block groups, except for a restricted touch block group among the plurality of touch block groups,

wherein the restricted touch block group is a touch block group that overlaps with at least one gate line that is currently being supplied with the modulated scan-on signal, and

wherein the modulated source signal or the modulated scan-on signal is synchronized with the touch driving signal.

13. The method of claim 12, further comprising:

supplying a modulated scan-off signal to other touch block groups among the plurality of touch block lines other than the restricted touch block group that is supplied with the modulated scan-on signal,

wherein the modulated scan-off signal is synchronized with the touch driving signal and prevents the modulated source signal from being written to a corresponding pixel among the plurality of pixels.

14. The method of claim 13, wherein the modulated source signal, the modulated scan-on signal, and the modulated scan-off signal have a same phase as the touch driving signal.

15. The method of claim 12, further comprising:

generating a high-level driving voltage and a low-level driving voltage, by a driving voltage supply part, for driving the plurality of pixels; and

supplying the high-level driving voltage to a first driving voltage supply line and the low-level driving voltage to a second driving voltage supply line,

wherein the high-level driving voltage and the low-level driving voltage have a same phase as the touch driving signal.

16. The method of claim 15, wherein the modulated source signal, the modulated scan-on signal, the modulated scan-off signal, the high-level driving voltage, and the low-level driving voltage are generated based on a modulated ground signal having the same phase as the touch driving signal.

17. The method of claim 16, wherein the modulated source signal is a signal generated by modulating a data voltage based on the modulated ground signal,

wherein the modulated scan-on signal is generated by modulating a scan-on gate signal of a gate high-voltage level based on the modulated ground signal,

wherein the modulated scan-off signal is generated by modulating a scan-off gate signal of a gate low-voltage level based on the modulated ground signal,

wherein the high-level driving voltage is generated by modulating a high-voltage power signal based on the modulated ground signal, and

wherein the low-level driving voltage is generated by modulating a low-voltage power signal based on the modulated ground signal.

18. The method of claim 12, further comprising:

sequentially supplying the modulated scan-on signal to the plurality of touch block groups in a first direction; and

selectively sensing for touch on another touch block group among the plurality of touch block groups in the first direction or a second direction opposite to the first direction,

wherein the another touch block group is a different touch block group than the restricted touch block group.

19. The method of claim 12, further comprising:

sequentially supplying the modulated scan-on signal to the plurality of touch block groups in a first direction; and

randomly selecting another touch block group among the plurality of touch block groups and sensing for touch on the another touch block group,

wherein the another touch block group is a different touch block group than the restricted touch block group.

20. The method of claim 12, wherein the modulated source signal and the modulated scan-on signal are generated based on a modulated ground signal supplied to the data driver and the gate driver, and

wherein the modulated ground signal supplied to the data driver and the gate driver is not continuously supplied during a frame period.