Touch control display screen and electronic device

• US 9,798,402 B2
• Filed: 04/20/2015
• Issued: 10/24/2017
• Est. Priority Date: 11/21/2014
• Status: Active Grant

• Current Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Original Assignee: Shanghai Tianma Micro-Electronics Company Limited (Tianma Microelectronics Company Limited), Tianma Microelectronics Company Limited
• Inventors: Zhou, Xingyao, Li, Fei, Yuan, Yong
• Primary Examiner(s): Hong, Richard
• Application Number:
  US14/691,484
• Publication Number:
  US 20160147343A1
• Time in Patent Office: 918 Days
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• 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 3/0445 using two or more layers of sensing electrodes, e.g. using two layers of electrodes separated by a dielectric layer
• 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

Abstract

A touch control display screen includes: a touch control electrode layer including a plurality of touch control electrodes; a first electrode layer opposite to the touch control electrode layer and including a plurality of first electrodes; a liquid crystal layer between the touch control electrode layer and the first electrode layer; a switch control circuit connected with at least one touch control electrode; a display control circuit connected with the first electrodes; and a synchronization control circuit connected with the switch control circuit. In the display stage, the display control circuit outputs a first common voltage, and the synchronization control circuit controls the switch control circuit to output a second common voltage equal to the first common voltage. Many advantages are provided, such as a uniform display effect, fewer residual ions, better display quality, higher reliability, simplified circuit, lower cost, and increased light transmittance.

Claims

1. A touch control display screen, comprising:

a touch control electrode layer comprising a plurality of touch control electrodes;

a first electrode layer opposite to the touch control electrode layer and comprising a plurality of first electrodes;

a liquid crystal layer disposed between the touch control electrode layer and the first electrode layer;

a switch control circuit electrically connected with at least one touch control electrode, the switch control circuit comprising an amplifying circuit and a switch circuit, wherein the amplifying circuit directly turns on or off the switch circuit;

a touch control circuit electrically connected with at least one touch control electrode;

a display control circuit electrically connected with the plurality of first electrodes and electrically coupled to the switch circuit; and

a synchronization control circuit electrically connected with the switch control circuit and the touch control circuit and providing a synchronization control signal to the amplifying circuit and the touch control circuit, wherein the switch control circuit connects the display control circuit with the plurality of touch control electrodes when the amplifying circuit turns on the switch circuit,

wherein in a display stage, the display control circuit outputs a first common voltage to the first electrode layer, and the synchronization control circuit controls the switch control circuit to output a second common voltage equal to the first common voltage; and

in a touch control stage, the synchronization control circuit controls the touch control circuit to provide a touch control drive voltage to the at least one touch control electrode, and the first electrode layer outputs a touch control detection signal, so that the first electrode layer is reused as a common electrode in the display stage and as a touch control detection electrode in the touch control stage.

2. The touch control display screen according to claim 1, further comprising

a touch control circuit electrically connected with the at least one touch control electrode and the synchronization control circuit, wherein in a touch control stage, the synchronization control circuit controls the touch control circuit to output a touch control signal.

3. The touch control display screen according to claim 2, wherein the synchronization control circuit is configured to output the synchronization control signal, wherein in the display stage, the display control circuit outputs the first common voltage, and the synchronization control signal controls the switch control circuit to output the second common voltage;

and in the touch control stage, the synchronization control signal controls the touch control circuit to output the touch control signal.

4. The touch control display screen according to claim 3, wherein the switch circuit is switched to an on-state in the display stage and is switched to an off-state in the touch control stage.

5. The touch control display screen according to claim 4, wherein the switch circuit comprises a control terminal electrically connected with the synchronization control circuit and configured to receive the synchronization control signal, an input terminal electrically connected with the display control circuit, and an output terminal electrically connected with the at least one touch control electrode.

6. The touch control display screen according to claim 5, wherein the amplifying circuit comprises

an amplifier or an inverting amplifier electrically connected with the control terminal of the switch circuit and the synchronization control circuit.

7. The touch control display screen according to claim 6, wherein the switch circuit comprises a thin film transistor, a metal oxide semiconductor field effect transistor, a triode or a transmission gate.

8. The touch control display screen according to claim 2, wherein the plurality of touch control electrodes comprise a plurality of touch control drive electrodes and a plurality of touch control detection electrodes, the touch control circuit comprises a touch control drive circuit and a touch control detection circuit, the touch control drive circuit is electrically connected to the plurality of touch control drive electrodes, and the touch control detection circuit is electrically connected to the plurality of touch control detection electrodes.

9. The touch control display screen according to claim 2, wherein the plurality of touch control electrodes comprise a plurality of touch control drive electrodes, and the plurality of first electrodes receive the first common voltage in the display stage and output a touch control detection signal in the touch control stage.

10. The touch control display screen according to claim 2, wherein the plurality of touch control electrodes comprise a plurality of touch control detection electrodes, and the plurality of first electrodes receive the first common voltage in the display stage and receive a touch control drive voltage in the touch control stage.

11. The touch control display screen according to claim 1, further comprising

a first substrate and a second substrate opposite to the first substrate, wherein the plurality of touch control electrodes are located on a first side of the first substrate which is close to the liquid crystal layer or on a second side of the first substrate which is opposite to the first side, and the plurality of first electrodes are located on a side of the second substrate which is close to the liquid crystal layer.

12. The touch control display screen according to claim 11, further comprising

a display region and a non-display region, wherein the display region comprises a pixel array, and the pixel array and the plurality of first electrodes form an electric field.

13. The touch control display screen according to claim 11, wherein at least a portion of the switch control circuit is located on the first substrate, the second substrate, or a flexible printed circuit board, or in an integrated circuit chip.

14. An electronic device, comprising a touch control display screen, wherein the touch control display screen comprises:

a touch control electrode layer comprising a plurality of touch control electrodes;

a first electrode layer opposite to the touch control electrode layer and comprising a plurality of first electrodes;

a liquid crystal layer disposed between the touch control electrode layer and the first electrode layer;

a switch control circuit electrically connected with at least one of the plurality of touch control electrodes, the switch control circuit comprising an amplifying circuit and a switch circuit, wherein the amplifying circuit directly turns on or off the switch circuit;

a touch control circuit electrically connected with at least one touch control electrode;

a display control circuit electrically connected with the plurality of first electrodes and electrically coupled to the switch circuit; and

a synchronization control circuit electrically connected with the switch control circuit and the touch control circuit and providing a synchronization control signal to the amplifying circuit and the touch control circuit, wherein the switch control circuit connects the display control circuit with the plurality of touch control electrodes when the amplifying circuit turns on the switch circuit,

wherein in a display stage, the display control circuit outputs a first common voltage to the first electrode layer, and the synchronization control circuit controls the switch control circuit to output a second common voltage equal to the first common voltage; and

in a touch control stage, the synchronization control circuit controls the touch control circuit to provide a touch control drive voltage to the at least one touch control electrode, and the first electrode layer outputs a touch control detection signal, so that the first electrode layer is reused as a common electrode in the display stage and as a touch control detection electrode in the touch control stage.

15. The electronic device according to claim 14, wherein the touch control display screen further comprises a touch control circuit electrically connected with at least one touch control electrode and the synchronization control circuit, wherein in a touch control stage, the synchronization control circuit controls the touch control circuit to output a touch control signal.

16. The electronic device according to claim 15, wherein the synchronization control circuit is configured to output the synchronization control signal, wherein in the display stage, the display control circuit outputs the first common voltage, and the synchronization control signal controls the switch control circuit to output the second common voltage;

and in the touch control stage, the synchronization control signal controls the touch control circuit to output the touch control signal.

17. The electronic device according to claim 16, wherein the switch circuit is switched to on-state in the display stage and is switched to off-state in the touch control stage.

18. The electronic device according to claim 17, wherein the switch circuit comprises a control terminal electrically connected with the synchronization control circuit and configured to receive the synchronization control signal, an input terminal electrically connected with the display control circuit, and an output terminal electrically connected with the at least one touch control electrode.

19. The electronic device according to claim 18, wherein the amplifying circuit comprises an amplifier or an inverting amplifier electrically connected with the control terminal of the switch circuit and the synchronization control circuit.

20. The electronic device according to claim 15, wherein the plurality of touch control electrodes comprise a plurality of touch control drive electrodes and a plurality of touch control detection electrodes, the touch control circuit comprises a touch control drive circuit and a touch control detection circuit, the touch control drive circuit is electrically connected to the plurality of touch control drive electrodes, and the touch control detection circuit is electrically connected to the plurality of touch control detection electrodes;

or, the plurality of touch control electrodes comprise a plurality of touch control drive electrodes, and the plurality of first electrodes receive the first common voltage in the display stage and output a touch control detection signal in the touch control stage;

or, the plurality of touch control electrodes comprise a plurality of touch control detection electrodes, and the plurality of first electrodes receive the first common voltage in the display stage and receive a touch control drive voltage in the touch control stage.