Touch scanning circuit and driving method thereof, touch driving circuit and touch panel

• US 10,067,588 B2
• Filed: 11/25/2016
• Issued: 09/04/2018
• Est. Priority Date: 01/12/2016
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Chengdu BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Chengdu BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Tan, Wen, Deng, Yin, Wei, Dongmei
• Primary Examiner(s): Lu, William
• Application Number:
  US15/537,769
• Publication Number:
  US 20180059836A1
• Time in Patent Office: 648 Days
• Field of Search: None
• CPC Class Codes: G06F 2203/04112 Electrode mesh in capacitive digitiser: electrode for touch sensing is formed of a mesh of very fine, normally metallic, interconnected lines that are almost invisible to see. This provides a quite large but transparent electrode surface, without need for ITO or similar transparent conductive material
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04164 Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
• 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 2310/0264 Details of driving circuits

Abstract

A touch scanning circuit and a driving method thereof, a touch driving circuit and a display panel. The touch scanning circuit includes: an input sub-circuit, a first control sub-circuit, a second control sub-circuit, a shift output sub-circuit and a touch output sub-circuit. The input sub-circuit is configured to control a potential of a first node; the first control sub-circuit is configured to control connection and disconnection between the first node and a third node; the second control sub-circuit is configured to control a potential of a second node; the shift output sub-circuit is configured to control a potential of a shift output end according to the third node and the second node; and the touch output sub-circuit is configured to control a signal outputted from a touch output end according to the second node, the shift output end and the first clock signal end.

Claims

1. A touch scanning circuit, comprising:

an input sub-circuit, a first control sub-circuit, a second control sub-circuit, a shift output sub-circuit and a touch output sub-circuit, wherein;

a first end of the input sub-circuit is connected with a shift input signal end, a second end is connected with a first reference signal end, a third end is connected with a second reference signal end, a fourth end is connected with a first node, and a fifth end is connected with a second node;

the input sub-circuit is configured to provide a signal of the first reference signal end to the first node under control of the shift input signal end, and provide a signal of the second reference signal end to the first node under control of the second node;

a first end of the first control sub-circuit is connected with the first node, a second end is connected with a first clock signal end, a third end is connected with a third node, and a fourth end is connected with a shift output end;

the first control sub-circuit is configured to allow the first node and the third node to be in a connecting state under control of the first clock signal end, and allow a voltage difference between the first node and the shift output end to be kept stable when the first node is in a floating state;

a first end of the second control sub-circuit is connected with the second node, a second end is connected with the shift input signal end, a third end is connected with the first clock signal end, and a fourth end is connected with the second reference signal end;

the second control sub-circuit is configured to provide the signal of the second reference signal end to the second node under control of the shift input signal end, and provide a signal of the first clock signal end to the second node under control of the first clock signal end;

a first end of the shift output sub-circuit is connected with the third node, a second end is connected with a second clock signal end, a third end is connected with the second node, a fourth end is connected with the second reference signal end, and a fifth end is connected with the shift output end;

the shift output sub-circuit is configured to allow a voltage difference between the third node and the shift output end to be kept stable when the third node is in the floating state, provide a signal of the second clock signal end to the shift output end under control of the third node, and provide the signal of the second reference signal end to the shift output end under control of the second node;

a first end of the touch output sub-circuit is connected with the shift output end, a second end is connected with a touch input signal end, a third end is connected with the second node, a fourth end is connected with a common signal end, a fifth end is connected with the first clock signal end, and a sixth end is connected with a touch output end; and

the touch output sub-circuit is configured to provide a signal of the touch input signal end to the touch output end under control of the shift output end, and provide a signal of the common signal end to the touch output end under control of at least one of the second node or the first clock signal end.

2. The touch scanning circuit according to claim 1, wherein the first control sub-circuit includes:

a first switching transistor and a first capacitor, in which;

a gate electrode of the first switching transistor is connected with the first clock signal end, a source electrode is connected with the first node, and a drain electrode is connected with the third node; and

the first capacitor is connected between the first node and the shift output end.

3. The touch scanning circuit according to claim 2, wherein the second control sub-circuit includes:

a ninth switching transistor and a tenth switching transistor, in which;

a gate electrode of the ninth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node; and

both a gate electrode and a source electrode of the tenth switching transistor are connected with the first clock signal end, and a drain electrode is connected with the second node.

4. The touch scanning circuit according to claim 2, wherein the second control sub-circuit includes:

an eleventh switching transistor and a third capacitor, in which;

a gate electrode of the eleventh switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node; and

the third capacitor is connected between the second node and the first clock signal end.

5. The touch scanning circuit according to claim 2, wherein the second control sub-circuit includes:

a twelfth switching transistor, a thirteenth switching transistor, a fourteenth switching transistor and a fifteenth switching transistor, in which;

a gate electrode of the twelfth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with a gate electrode of the fifteenth switching transistor;

a gate electrode of the thirteenth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node;

both a gate electrode and a source electrode of the fourteenth switching transistor are connected with the first clock signal end, and a drain electrode is connected with the gate electrode of the fifteenth switching transistor; and

a source electrode of the fifteenth switching transistor is connected with the first clock signal end, and a drain electrode is connected with the second node.

6. The touch scanning circuit according to claim 1, wherein the input sub-circuit includes:

a second switching transistor and a third switching transistor, in which;

a gate electrode of the second switching transistor is connected with the shift input signal end, a source electrode is connected with the first reference signal end, and a drain electrode is connected with the first node; and

a gate electrode of the third switching transistor is connected with the second node, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the first node.

7. The touch scanning circuit according to claim 6, wherein the second control sub-circuit includes:

a ninth switching transistor and a tenth switching transistor, in which;

a gate electrode of the ninth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node; and

both a gate electrode and a source electrode of the tenth switching transistor are connected with the first clock signal end, and a drain electrode is connected with the second node.

8. The touch scanning circuit according to claim 6, wherein the second control sub-circuit includes:

an eleventh switching transistor and a third capacitor, in which;

a gate electrode of the eleventh switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node; and

the third capacitor is connected between the second node and the first clock signal end.

9. The touch scanning circuit according to claim 6, wherein the second control sub-circuit includes:

a twelfth switching transistor, a thirteenth switching transistor, a fourteenth switching transistor and a fifteenth switching transistor, in which;

a gate electrode of the twelfth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with a gate electrode of the fifteenth switching transistor;

a gate electrode of the thirteenth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node;

both a gate electrode and a source electrode of the fourteenth switching transistor are connected with the first clock signal end, and a drain electrode is connected with the gate electrode of the fifteenth switching transistor; and

a source electrode of the fifteenth switching transistor is connected with the first clock signal end, and a drain electrode is connected with the second node.

10. The touch scanning circuit according to claim 1, wherein the shift output sub-circuit includes:

a fourth switching transistor, a fifth switching transistor and a second capacitor, in which;

a gate electrode of the fourth switching transistor is connected with the third node, a source electrode is connected with the second clock signal end, and a drain electrode is connected with the shift output end;

a gate electrode of the fifth switching transistor is connected with the second node, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the shift output end; and

the second capacitor is connected between the third node and the shift output end.

11. The touch scanning circuit according to claim 10, wherein the second control sub-circuit includes:

a ninth switching transistor and a tenth switching transistor, in which;

a gate electrode of the ninth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node; and

both a gate electrode and a source electrode of the tenth switching transistor are connected with the first clock signal end, and a drain electrode is connected with the second node.

12. The touch scanning circuit according to claim 1, wherein the touch output sub-circuit includes:

a sixth switching transistor, a seventh switching transistor and an eighth switching transistor, in which;

a gate electrode of the sixth switching transistor is connected with the shift output end, a source electrode is connected with the touch input signal end, and a drain electrode is connected with the touch output end;

a gate electrode of the seventh switching transistor is connected with the second node, a source electrode is connected with the common signal end, and a drain electrode is connected with the touch output end; and

a gate electrode of the eighth switching transistor is connected with the first clock signal end, a source electrode is connected with the common signal end, and a drain electrode is connected with the touch output end.

13. The touch scanning circuit according to claim 1, wherein the second control sub-circuit includes:

a ninth switching transistor and a tenth switching transistor, in which;

a gate electrode of the ninth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node; and

both a gate electrode and a source electrode of the tenth switching transistor are connected with the first clock signal end, and a drain electrode is connected with the second node.

14. The touch scanning circuit according to to claim 1, wherein the second control sub-circuit includes:

an eleventh switching transistor and a third capacitor, in which;

a gate electrode of the eleventh switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node; and

the third capacitor is connected between the second node and the first clock signal end.

15. The touch scanning circuit according to claim 1, wherein the second control sub-circuit includes:

a twelfth switching transistor, a thirteenth switching transistor, a fourteenth switching transistor and a fifteenth switching transistor, in which;

a gate electrode of the twelfth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with a gate electrode of the fifteenth switching transistor;

a gate electrode of the thirteenth switching transistor is connected with the shift input signal end, a source electrode is connected with the second reference signal end, and a drain electrode is connected with the second node;

both a gate electrode and a source electrode of the fourteenth switching transistor are connected with the first clock signal end, and a drain electrode is connected with the gate electrode of the fifteenth switching transistor; and

a source electrode of the fifteenth switching transistor is connected with the first clock signal end, and a drain electrode is connected with the second node.

16. A touch driving circuit, comprising a plurality of touch scanning circuits in a cascade connection, each of the plurality of touch scanning circuits being the touch scanning circuit according to claim 1, wherein;

except a final-stage touch scanning circuit, a shift output end in each of the remaining touch scanning circuits is respectively connected with a shift input signal end in a next-stage touch scanning circuit that is adjacent to the corresponding touch scanning circuit; and

a shift input signal end in a first-stage touch scanning circuit is connected with a frame start signal end.

17. A touch panel, comprising a plurality of touch scanning lines disposed on an array substrate in the touch panel, and a touch driving circuit disposed at a border of the array substrate and configured to sequentially output touch scanning signals to the touch scanning lines, wherein the touch driving circuit is the touch driving circuit according to claim 9.

18. A driving method of the touch scanning circuit according to claim 1, comprising:

an input period, an output period and a first maintaining period, in which;

at the input period, the input sub-circuit provides the signal of the first reference signal end to the first node under the control of the shift input signal end;

the second control sub-circuit provides the signal of the second reference signal end to the second node under the control of the shift input signal end;

the first control sub-circuit allows the first node and the third node to be in the connecting state under the control of the first clock signal end;

the shift output sub-circuit provides the signal of the second clock signal end to the shift output end under the control of the third node;

the touch output sub-circuit provides the signal of the common signal end to the touch output end under the control of the first clock signal end;

at the output period, the first node and the third node are in the floating state;

the first control sub-circuit allows the voltage difference between the first node and the shift output end to be kept stable;

the shift output sub-circuit allows the voltage difference between the third node and the shift output end to be kept stable, and provides the signal of the second clock signal end to the shift output end under the control of the third node;

the touch output sub-circuit provides the signal of the touch input signal end to the touch output end under the control of the shift output end;

at the first maintaining period, the second control sub-circuit provides the signal of the first clock signal end to the second node under the control of the first clock signal end;

the input sub-circuit provides the signal of the second reference signal end to the first node under the control of the second node;

the first control sub-circuit allows the first node and the third node to be in the connecting state under the control of the first clock signal end;

the shift output sub-circuit provides the signal of the second reference signal end to the shift output end under the control of the second node; and

the touch output sub-circuit provides the signal of the common signal end to the touch output end under the control of the second node and the first clock signal end.

19. The driving method according to claim 18, further comprising:

a second maintaining period, in which;

at the second maintaining period, the second control sub-circuit maintains a potential of the second node;

the input sub-circuit provides the signal of the second reference signal end to the first node under the control of the second node;

the first control sub-circuit allows the first node and the third node to be disconnected under the control of the first clock signal end;

the shift output sub-circuit maintains a potential of the third node and provides the signal of the second reference signal end to the shift output end under the control of the second node; and

the touch output sub-circuit provides the signal of the common signal end to the touch output end under the control of the second node.

20. The driving method according to claim 18, further comprising:

a second maintaining period, in which;

at the second maintaining period, the second control sub-circuit allows the second node and the second reference signal end to have a same potential;

the first control sub-circuit allows the first node and the third node to be disconnected under the control of the first clock signal end;

the shift output sub-circuit maintains a potential of the third node and maintains a potential of the shift output end; and

the touch output sub-circuit provides no output signal to the touch output end.