CN110673758B

CN110673758B - Touch control display device

Info

Publication number: CN110673758B
Application number: CN201910874023.8A
Authority: CN
Inventors: 陈志成; 刘贵文; 吴仰恩
Original assignee: AU Optronics Corp
Current assignee: AU Optronics Corp
Priority date: 2019-05-07
Filing date: 2019-09-17
Publication date: 2023-04-07
Anticipated expiration: 2039-09-17
Also published as: TW202042028A; TWI703480B; CN110673758A

Abstract

A touch display device comprises a touch display module, an integrated driving circuit and a multiplexer circuit. The integrated driving circuit has a driving output point. The multiplexer circuit includes a first multiplexing switch, a second multiplexing switch, and a third multiplexing switch. The first multiplexing switch is provided with a first end and a second end which are coupled with a first signal wire in the touch display module, and a control end for receiving a first switch signal. The second multiplexing switch has a second end coupled to the first multiplexing switch, a first end coupled to a second signal line in the touch display module, a second end coupled to the driving output point, and a control end for receiving a second switch signal. The third multiplexing switch has a first end coupled to a third signal line in the touch display module, a second end coupled to the driving output point, and a control end for receiving a third switch signal.

Description

Touch control display device

Technical Field

The present invention relates to a touch display technology, and more particularly, to a touch display device.

Background

With the development of semiconductor technology, the touch module and the display panel are integrated into a single component, and the driving circuit for driving the touch module and the display panel is also integrated into an integrated touch and display chip (TDDI). In order to reduce the size of the integrated touch and display chip, a multiplexer circuit is disposed between the integrated touch and display chip and the touch display panel to reduce the number of output channels (i.e., the number of output pins) of the integrated touch and display chip. However, as the number of output channels decreases, the multiplexer circuit requires more control signals and switching elements (e.g., transistors), but more switching elements require more response time, which may affect the driving timing of the touch display panel. Therefore, how to improve the circuit operation of the multiplexer circuit is an important issue.

Disclosure of Invention

The invention provides a touch display device, which can reduce the number of output pins of TDDI and reduce the response time required by a switch component of a traditional multiplexer circuit.

The touch display device comprises a touch display module, an integrated driving circuit and a multiplexer circuit. The integrated driving circuit has a driving output point. The multiplexer circuit includes a first multiplexing switch, a second multiplexing switch, and a third multiplexing switch. The first multiplexing switch has a first end, a second end and a control end, wherein the first end of the first multiplexing switch is coupled to a first signal line in the touch display module, and the control end of the first multiplexing switch receives the control end of the first switch signal. The second multiplexing switch has a first end, a second end and a control end, wherein the first end of the second multiplexing switch is coupled to the second end of the first multiplexing switch and a second signal line in the touch display module, the second end of the second multiplexing switch is coupled to the driving output point, and the control end of the second multiplexing switch receives a second switch signal. The third multiplexing switch has a first end, a second end and a control end, wherein the first end of the third multiplexing switch is coupled to a third signal line in the touch display module, the second end of the third multiplexing switch is coupled to the driving output point, and the control end of the third multiplexing switch receives a third switch signal.

In view of the above, in the touch display device according to the embodiment of the invention, at least one set of the first multiplexing switch and the second multiplexing switch connected in series is configured in the multiplexer circuit, and the sequentially enabled first switch signal and the sequentially enabled second switch signal are provided. Therefore, the multiplexer circuit only needs to consider the rising time of 1 switch signal, and the influence of the transition time of the switch is reduced.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1A is a circuit diagram of a touch display device according to a first embodiment of the invention.

Fig. 1B is a timing diagram for explaining the touch display device shown in fig. 1A.

Fig. 2A is a circuit diagram of a touch display device according to a second embodiment of the invention.

Fig. 2B is a timing diagram for explaining the touch display device shown in fig. 2A.

Fig. 3A is a circuit diagram of a touch display device according to a third embodiment of the invention.

Fig. 3B is a timing diagram for explaining the touch display device shown in fig. 3A.

Detailed Description

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present invention and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various components, elements, regions, layers and/or sections, these components, elements, regions, and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a "first component," "member," "region," "layer" or "portion" discussed below could be termed a second component, member, region, layer or portion without departing from the teachings herein.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms, including "at least one", unless the content clearly indicates otherwise. "or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions integers, steps, operations, elements, components, and/or groups thereof.

Fig. 1A is a circuit diagram of a touch display device according to a first embodiment of the invention. Referring to fig. 1A, in the present embodiment, the touch display device 100 at least includes a gate driving circuit 110, a touch display module 120, a plurality of multiplexer circuits 130, and an integrated driving circuit 140, wherein the integrated driving circuit 140 includes a Source driving circuit and a touch sensing circuit. In other embodiments, the touch display device 100 may further include other circuits, such as a control circuit, a Microcontroller (MCU), etc., to provide the required control signals and/or switching signals, which is not limited in the embodiments of the present invention.

The gate driving circuit 110 is used for providing a plurality of sequentially enabled gate signals (e.g., G1, G2, G3). The touch display module 120 is configured with a plurality of gate lines GL, a plurality of signal lines (e.g., a first signal line SL11 to a fourth signal line SL 14), and a plurality of display pixels PX, wherein the first signal line SL11 to the third signal line SL13 are respectively coupled to data lines of the corresponding display pixels PX, and the fourth signal line SL14 is a touch sensing electrode of the touch module. The gate lines GL are coupled to the gate driving circuit 110 to respectively receive corresponding gate signals (e.g. G1, G2, G3), and the display pixels PX are coupled to the corresponding gate lines GL to respectively receive corresponding gate signals (e.g. G1, G2, G3).

The integrated driving circuit 140 has a plurality of driving output points (e.g., S1, S2, S3) for providing pixel voltages or touch driving signals. The multiplexer circuit 130 is coupled between the first signal line SL11 to the fourth signal line SL14 and a driving output point (e.g., S1, S2, S3), transmits the pixel voltage provided by the integrated driving circuit 140 to the first signal line SL11 to the third signal line SL13, and provides the touch driving signal provided by the integrated driving circuit 140 to the fourth signal line SL14.

In the present embodiment, the multiplexer circuit 130 includes a first multiplexing switch M11, a second multiplexing switch M12, and a third multiplexing switch M13, wherein the first multiplexing switch M11, the second multiplexing switch M12, and the third multiplexing switch M13 are transistors, for example, but the present invention is not limited thereto.

The first multiplexing switch M11 has a first terminal, a second terminal and a control terminal. A first end of the first multiplexing switch M11 is coupled to the first signal line SL11 in the touch display module 120, and a control end of the first multiplexing switch M11 receives the first switch signal MUX11. The second multiplexing switch M12 has a first terminal, a second terminal, and a control terminal. A first terminal of the second multiplexing switch M12 is coupled to the second terminal of the first multiplexing switch M11 and the second signal line SL12 in the touch display module 120, a second terminal of the second multiplexing switch M12 is coupled to a corresponding driving output point (e.g., S1, S2, S3), and a control terminal of the second multiplexing switch M12 receives the second switch signal MUX12. The corresponding driving output points (e.g., S1, S2, S3) are directly coupled to the third signal lines SL13 in the touch display module 120. The third multiplexing switch M13 has a first terminal, a second terminal, and a control terminal. A first terminal of the third multiplexing switch M13 is coupled to the fourth signal line SL14 in the touch display module 120, a second terminal of the third multiplexing switch M13 is coupled to a corresponding driving output point (e.g., S1, S2, S3), and a control terminal of the third multiplexing switch M13 receives the third switch signal MUX13.

Fig. 1B is a timing diagram for explaining the touch display device shown in fig. 1A. Referring to fig. 1A and fig. 1B, in the present embodiment, one frame period (not shown) at least includes at least one touch scanning period PTP and at least two display scanning periods PDS, that is, each touch scanning period PTP may be configured between two display scanning periods PDS. Each display scan period PDS at least includes a plurality of horizontal scan periods (e.g., PHS1 to PHS 3), and each horizontal scan period (e.g., PHS1 to PHS 3) includes three sub-pixel periods PPX, i.e., the display pixels PX in each column are divided into three portions to be sequentially driven (and written). The above description is for illustrative purposes, and the present invention is not limited thereto.

Furthermore, the time length of the single enabling period of the first switch signal MUX11 and the second switch signal MUX12 is also two sub-pixel periods PPX, the enabling period of the first switch signal MUX11 is earlier than the enabling period of the second switch signal MUX12, and the single enabling period of the first switch signal MUX11 and the single enabling period of the second switch signal MUX12 overlap one sub-pixel period PPX. However, the enabled period of the third switching signal MUX13 does not overlap the enabled periods of the first switching signal MUX11 and the second switching signal MUX12. That is, the third switch signal MUX13 is disabled in the horizontal scanning period (e.g., PHS1 to PHS 3).

Taking the horizontal scanning period PHS1 as an example, the first half or the second half of the single enable period of the first switching signal MUX11 (i.e., one sub-pixel period PPX) is located within the horizontal scanning period PHS 1. The single enable period of the second switching signal MUX12 is completely within the horizontal scanning period PHS1, but the time length of the single enable period of the second switching signal MUX12 is less than the time length of the horizontal scanning period PHS1, and is about one sub-pixel period PPX.

In the horizontal scanning period PHS1, when the first switch signal MUX11 and the second switch signal MUX12 are both enabled (i.e., the first multiplexing switch M11 and the second multiplexing switch M12 are both turned on), the driving output point S1 outputs (or provides) the pixel voltage VP11 corresponding to the first signal line SL 11; when the first switch signal MUX11 is disabled and the second switch signal MUX12 is enabled (i.e., the first multiplexing switch M11 is turned off and the second multiplexing switch M12 is turned on), the driving output point S1 outputs (or provides) the pixel voltage VP12 corresponding to the second signal line SL 12; when the first switch signal MUX11 is enabled and the second switch signal MUX12 is disabled (i.e., the first multiplexing switch M11 is turned on and the second multiplexing switch M12 is disabled), the driving output point S1 outputs (or provides) the pixel voltage VP13 corresponding to the third signal line SL13, wherein the enabling of the MUX11 is for enabling the MUX11 and the MUX12 to have the same period.

The actions of the first multiplexing switch M11 and the second multiplexing switch M12 in other horizontal scanning periods (e.g., PHS2 and PHS 3) may refer to the horizontal scanning period PHS1, and will not be described herein again. Therefore, in each horizontal scanning period (for example, PHS1 to PHS 3), that is, in the on time of each gate line GL, since the switches are connected in series, only the falling time of 2 switching signals and the rising time of 1 switching signal need to be considered, and the influence of the transition time of the switches is reduced.

In the present embodiment, the touch scanning period PTP is assumed to be located between the horizontal scanning periods PHS2 and PHS 3. Then, when the horizontal scanning period PHS2 ends, the first switch signal MUX11 and the second switch signal MUX12 are disabled, and the third switch signal MUX13 is enabled to turn on the third multiplexing switch M13, wherein a single enabled period of the third switch signal MUX13 may be equal to the touch scanning period PTP. At this time, the driving output point S1 outputs (or provides) the corresponding touch signal STP to the fourth signal line SL14 for touch sensing.

In this embodiment, the horizontal scanning period PHS2 (i.e. the previous horizontal scanning period) may directly adjoin the touch scanning period PTP, and at least one dummy scanning period PDM is provided between the horizontal scanning period PHS3 (i.e. the next horizontal scanning period) and the touch scanning period PTP, wherein a time length of the dummy scanning period PDM may be equal to a time length of the sub-pixel period PPX. When the dummy scan period PDM is 1 (e.g., 1 sub-pixel period PPX), the waveforms of the first and second switching signals MUX11 and MUX12 can be kept intact (i.e., kept as two sub-pixel periods PPX).

Fig. 2A is a circuit diagram of a touch display device according to a second embodiment of the invention. Referring to fig. 1A and fig. 2A, in the present embodiment, a touch display device 200 is substantially the same as the touch display device 100, except for a touch display module 220 and a plurality of multiplexer circuits 230.

The touch display module 220 is configured with a plurality of gate lines GL, a plurality of signal lines (e.g., a first signal line SL21 to a fourth signal line SL 24), and a plurality of display pixels PX, wherein the first signal line SL21 to the third signal line SL23 are respectively coupled to data lines of the corresponding display pixels PX, and the fourth signal line SL24 is a touch sensing electrode of the touch module. The gate lines GL are coupled to the gate driving circuit 110 to respectively receive corresponding gate signals (e.g., G1, G2, G3), and the display pixels PX are coupled to the corresponding gate lines GL to respectively receive corresponding gate signals (e.g., G1, G2, G3).

In the present embodiment, the multiplexer circuit 230 includes a first multiplexing switch M21, a second multiplexing switch M22, a third multiplexing switch M23, and a fourth multiplexing switch M24, wherein the first multiplexing switch M21, the second multiplexing switch M22, the third multiplexing switch M23, and the fourth multiplexing switch M24 are transistors, but the embodiment of the invention is not limited thereto.

The first multiplexing switch M21 has a first terminal, a second terminal, and a control terminal. A first end of the first multiplexing switch M21 is coupled to a first signal line SL21 in the touch display module 220, and a control end of the first multiplexing switch M21 receives the first switch signal MUX21. Has a first end, a second end and a control end. A first terminal of the second multiplexing switch M22 is coupled to the second terminal of the first multiplexing switch M21 and the second signal line SL22 in the touch display module 220, a second terminal of the second multiplexing switch M22 is coupled to the corresponding driving output point (e.g., S1, S2, S3), and a control terminal of the second multiplexing switch M22 receives a control terminal of the second switch signal MUX 22. The third multiplexing switch M23 has a first terminal, a second terminal, and a control terminal. A first terminal of the third multiplexing switch M23 is coupled to the third signal line SL23 in the touch display module 220, a second terminal of the third multiplexing switch M23 is coupled to the corresponding driving output point (e.g., S1, S2, S3), and a control terminal of the third multiplexing switch M23 receives the third switching signal MUX23. The fourth multiplexing switch M24 has a first terminal, a second terminal, and a control terminal. A first terminal of the fourth multiplexing switch M24 is coupled to a fourth signal line SL24 in the touch display module 220, a second terminal of the fourth multiplexing switch M24 is coupled to a first terminal of the third multiplexing switch M23, and a control terminal of the fourth multiplexing switch M24 receives the fourth switching signal MUX24, wherein the second terminal of the fourth multiplexing switch M24 is coupled to the driving output point (e.g., S1, S2, S3) via the third multiplexing switch M23.

Fig. 2B is a timing diagram for explaining the touch display device shown in fig. 2A. Referring to fig. 1B, fig. 2A and fig. 2B, the same or similar elements are denoted by the same or similar reference numerals. In the present embodiment, the first switch signal MUX21, the second switch signal MUX22 and the third switch signal MUX23 are sequentially enabled and sequentially overlap one sub-pixel period PPX, and a time length of a single enabled period of the first switch signal MUX21 and the second switch signal MUX22 is also two sub-pixel periods PPX, wherein the enabled period of the first switch signal MUX21 is earlier than the enabled period of the second switch signal MUX22, and the enabled period of the second switch signal MUX22 is earlier than the enabled period of the third switch signal MUX23. The enable period of the fourth switching signal MUX24 does not overlap the enable periods of the first switching signal MUX21 and the second switching signal MUX22, but is covered by a single enable period of the third switching signal MUX23. That is, the third switching signal MUX23 is enabled in each horizontal scanning period (e.g., PHS1 to PHS 3) and the touch scanning period PTP, and the fourth switching signal MUX24 is disabled in the horizontal scanning period (e.g., PHS1 to PHS 3) but enabled in the touch scanning period PTP.

Taking the horizontal scanning period PHS1 as an example, the first half or the second half of the single enable period of the first switching signal MUX21 (i.e., one sub-pixel period PPX) is located within the horizontal scanning period PHS 1. The single enabled period of the second switch signal MUX22 and the third switch signal MUX23 is completely within the horizontal scanning period PHS1, but the time length of the single enabled period of the second switch signal MUX22 and the third switch signal MUX23 is less than the time length of the horizontal scanning period PHS1, and is about one sub-pixel period PPX.

In the horizontal scanning period PHS1, when the first switch signal MUX21 and the second switch signal MUX22 are enabled and the third switch signal MUX23 is disabled (i.e., the first multiplexing switch M21 and the second multiplexing switch M22 are turned on and the third multiplexing switch M23 is turned off), the driving output point S1 outputs (or provides) the pixel voltage VP21 corresponding to the first signal line SL 21; when the second switch signal MUX22 and the third switch signal MUX23 are both enabled but the first switch signal MUX21 is disabled (i.e., the second multiplexing switch M22 and the third multiplexing switch M23 are turned on but the first multiplexing switch M21 is turned off), the driving output point S1 outputs (or provides) the pixel voltage VP22 corresponding to the second signal line SL 22; when the first switch signal MUX21 and the third switch signal MUX23 are both enabled, and the second switch signal MUX22 is disabled (i.e. the first multiplexing switch M21 and the third multiplexing switch M23 are turned on but the second multiplexing switch M22 is turned off), the driving output point S1 outputs (or provides) the pixel voltage VP23 corresponding to the third signal line SL 23.

The actions of the first multiplexing switch M21, the second multiplexing switch M22, and the third multiplexing switch M23 in other horizontal scanning periods (e.g., PHS2 and PHS 3) may refer to the horizontal scanning period PHS1, and thus are not described herein again. Therefore, in each horizontal scanning period (for example, PHS1 to PHS 3), that is, in the on time of each gate line GL, since the switches are connected in series, only the falling time of 3 switching signals and the rising time of 1 switching signal need to be considered, and the influence of the transition time of the switches is reduced.

In the present embodiment, the touch scanning period PTP is assumed to be located between the horizontal scanning periods PHS2 and PHS 3. Then, when the horizontal scanning period PHS2 ends, the first switch signal MUX21 and the second switch signal MUX22 are disabled, the third switch signal MUX23 is enabled, and the fourth switch signal MUX24 is enabled to turn on the fourth multiplexing switch M24, wherein a single enabling period of the fourth switch signal MUX24 may be equal to the touch scanning period PTP. At this time, the driving output point S1 outputs (or provides) the corresponding touch signal STP to the fourth signal line SL24 for touch sensing.

In the present embodiment, the horizontal scanning period PHS2 (i.e., the previous horizontal scanning period) may be directly adjacent to the touch scanning period PTP, and at least one dummy scanning period PDM is provided between the horizontal scanning period PHS3 (i.e., the next horizontal scanning period) and the touch scanning period PTP, wherein a time length of the dummy scanning period PDM may be equal to a time length of the sub-pixel period PPX. When the dummy scan period PDM is 1 (e.g., 1 sub-pixel period PPX), the waveforms of the first and second switching signals MUX21 and MUX22 can be kept intact (i.e., kept as two sub-pixel periods PPX).

Fig. 3A is a circuit diagram of a touch display device according to a third embodiment of the invention. Referring to fig. 1A and fig. 3A, in the present embodiment, the touch display device 300 is substantially the same as the touch display device 100, except for the touch display module 320 and the multiplexer circuits 330.

The touch display module 320 is configured with a plurality of gate lines GL, a plurality of signal lines (e.g., a first signal line SL31 to a fifth signal line SL 35), and a plurality of display pixels PX, wherein the first signal line SL31 to the fourth signal line SL34 are respectively coupled to data lines of the corresponding display pixels PX, and the fifth signal line SL35 is a touch sensing electrode of the touch module. The gate lines GL are coupled to the gate driving circuit 110 to respectively receive corresponding gate signals (e.g. G1, G2, G3), and the display pixels PX are coupled to the corresponding gate lines GL to respectively receive corresponding gate signals (e.g. G1, G2, G3).

In the present embodiment, the multiplexer circuit 330 includes a first multiplexing switch M31, a second multiplexing switch M32, a third multiplexing switch M33, a fourth multiplexing switch M34, and a fifth multiplexing switch M35, wherein the first multiplexing switch M31, the second multiplexing switch M32, the third multiplexing switch M33, the fourth multiplexing switch M34, and the fifth multiplexing switch M35 are transistors, which is not limited in the embodiments of the present invention.

The first multiplexing switch M31 has a first terminal, a second terminal and a control terminal. The first terminal of the first multiplexing switch M31 is coupled to the first signal line SL31 in the touch display module 320, and the control terminal of the first multiplexing switch M31 receives the first switch signal MUX31. The second multiplexing switch M32 has a first terminal, a second terminal, and a control terminal. A first terminal of the second multiplexing switch M32 is coupled to the second terminal of the first multiplexing switch M31 and the second signal line SL32 in the touch display module 320, a second terminal of the second multiplexing switch M32 is coupled to the corresponding driving output point (e.g., S1, S2, S3), and a control terminal of the second multiplexing switch M32 receives a control terminal of the second switch signal MUX 32.

The third multiplexing switch M33 has a first terminal, a second terminal, and a control terminal. A first terminal of the third multiplexing switch M33 is coupled to a third signal line SL33 in the touch display module 320, and a control terminal of the third multiplexing switch M33 receives a third switch signal MUX33. The fourth multiplexing switch M34 has a first terminal, a second terminal, and a control terminal. A first terminal of the fourth multiplexing switch M34 is coupled to the second terminal of the third multiplexing switch M33 and a fourth signal line SL34 in the touch display module 320, a second terminal of the fourth multiplexing switch M34 is coupled to a corresponding driving output point (e.g., S1, S2, S3), and a control terminal of the fourth multiplexing switch M34 receives the second switch signal MUX34.

The fifth multiplexing switch M35 has a first terminal, a second terminal, and a control terminal. A first terminal of the fifth multiplexing switch M35 is coupled to the fifth signal line SL35 in the touch display module 320, a second terminal of the fifth multiplexing switch M35 is coupled to the corresponding driving output point (e.g., S1, S2, S3), and a control terminal of the fifth multiplexing switch M35 receives the fifth switch signal MUX35.

Fig. 3B is a timing diagram for explaining the touch display device shown in fig. 3A. Referring to fig. 1B, fig. 3A and fig. 3B, the same or similar components are denoted by the same or similar reference numerals. In this example, each horizontal scanning period (e.g., PHS1 to PHS 4) includes four sub-pixel periods PPX, i.e., each column of display pixels PX is divided into four portions to be sequentially driven (and written). Moreover, the first switch signal MUX31, the second switch signal MUX32, the third switch signal MUX33, and the fourth switch signal MUX34 are sequentially enabled and sequentially overlap one sub-pixel period PPX, and the time length of a single enabled period of the first switch signal MUX31, the second switch signal MUX32, the third switch signal MUX33, and the fourth switch signal MUX34 is also two sub-pixel periods PPX, wherein the enabled period of the first switch signal MUX31 is earlier than the enabled period of the second switch signal MUX32, the enabled period of the second switch signal MUX32 is earlier than the enabled period of the third switch signal MUX33, and the enabled period of the third switch signal MUX33 is earlier than the enabled period of the fourth switch signal MUX34. The enabled period of the fifth switching signal MUX35 does not overlap the enabled periods of the first switching signal MUX31, the second switching signal MUX32, the third switching signal MUX33, and the fourth switching signal MUX34. That is, the fifth switching signal MUX35 is disabled in the horizontal scanning period (e.g., PHS1 to PHS 4) but enabled in the touch scanning period PTP.

Taking the horizontal scanning period PHS1 as an example, the first half or the second half of the single enable period of the first switching signal MUX31 (i.e., one sub-pixel period PPX) is located within the horizontal scanning period PHS 1. The single enabling period of the second switching signal MUX32, the third switching signal MUX33, and the fourth switching signal MUX34 is completely within the horizontal scanning period PHS1, but the time length of the single enabling period of the second switching signal MUX32, the third switching signal MUX33, and the fourth switching signal MUX34 is less than the time length of the horizontal scanning period PHS1, and is about two sub-pixel periods PPX.

In the horizontal scanning period PHS1, when the first switch signal MUX31 and the second switch signal MUX32 are enabled and the third switch signal MUX33 and the fourth switch signal MUX34 are disabled (i.e. the first multiplexing switch M31 and the second multiplexing switch M32 are turned on and the third multiplexing switch M33 and the fourth multiplexing switch M34 are turned off), the driving output point S1 outputs (or provides) the pixel voltage VP31 corresponding to the first signal line SL 31. When the second switch signal MUX32 and the third switch signal MUX33 are enabled but the first switch signal MUX31 and the fourth switch signal MUX34 are disabled (i.e. the second multiplexing switch M32 and the third multiplexing switch M33 are turned on but the first multiplexing switch M31 and the fourth multiplexing switch M34 are turned off), the driving output point S1 outputs (or provides) the pixel voltage VP32 corresponding to the second signal line SL 32.

When the third switch signal MUX33 and the fourth switch signal MUX34 are both enabled and the first switch signal MUX31 and the second switch signal MUX32 are both disabled (i.e., the third multiplexing switch M33 and the fourth multiplexing switch M34 are turned on but one multiplexing switch M31 and the second multiplexing switch M32 are turned off), the driving output point S1 outputs (or provides) the pixel voltage VP33 corresponding to the third signal line SL 33. When the first switch signal MUX31 and the fourth switch signal MUX34 are enabled and the second switch signal MUX32 and the third multiplexing switch M33 are disabled (i.e. the first multiplexing switch M31 and the fourth multiplexing switch M34 are turned on but the second multiplexing switch M32 and the third multiplexing switch M33 are turned off), the driving output point S1 outputs (or provides) the pixel voltage VP23 corresponding to the fourth signal line SL 34.

The actions of the first multiplexing switch M31, the second multiplexing switch M32, the third multiplexing switch M33, and the fourth multiplexing switch M34 in other horizontal scanning periods (e.g., PHS2 to PHS 4) may refer to the horizontal scanning period PHS1, and will not be described herein again. Therefore, in each horizontal scanning period (for example, PHS1 to PHS 4), that is, in the on time of each gate line GL, since the switches are connected in series, only the falling time of 4 switching signals and the rising time of 1 switching signal need to be considered, and the influence of the transition time of the switches is reduced.

In the present embodiment, the touch scanning period PTP is assumed to be located between the horizontal scanning periods PHS3 and PHS 4. Then, when the horizontal scanning period PHS3 ends, the first to third switching signals MUX31 to 33 are disabled, the fourth switching signal MUX34 is changed to disabled, and the fifth switching signal MUX35 is changed to enabled to turn on the fifth multiplexing switch M35, wherein a single enabled period of the fifth switching signal MUX35 may be equal to the touch scanning period PTP. At this time, the driving output point S1 outputs (or provides) the corresponding touch signal STP to the fifth signal line SL35 for touch sensing.

In the present embodiment, the horizontal scanning period PHS3 (i.e., the previous horizontal scanning period) may be directly adjacent to the touch scanning period PTP, and at least one dummy scanning period PDM is provided between the horizontal scanning period PHS4 (i.e., the next horizontal scanning period) and the touch scanning period PTP, wherein a time length of the dummy scanning period PDM may be equal to a time length of the sub-pixel period PPX. When the dummy scan period PDM is 1 (e.g., 1 sub-pixel period PPX), the waveforms of the first to fourth switching signals MUX31 to MUX34 can be kept intact (i.e., kept as two sub-pixel periods PPX).

In summary, in the touch display device of the embodiment of the invention, the multiplexer circuit at least includes a set of first multiplexing switches and a set of second multiplexing switches connected in series, and provides sequentially enabled first switch signals and second switch signals. Therefore, the multiplexer circuit only needs to consider the rising time of 1 switch signal, and the influence of the transition time of the switch is reduced.

Although the present invention has been described with reference to the above embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.

Description of the symbols

100. 200 and 300: touch control display device

110: gate drive circuit

120. 220, 320: touch control display module

130. 230, 330: multiplexer circuit

140: integrated driving circuit

G1, G2, G3: grid signal

GL: gate line

M11, M21, M31: a first multiplexing switch

M12, M22, M32: second multiplexing switch

M13, M23, M33: third multiplexing switch

M24, M34: fourth multiplexing switch

M35: fifth multiplexing switch

MUX11, MUX21, MUX31: a first switching signal

MUX12, MUX22, MUX32: second switching signal

MUX13, MUX23, MUX33: third switching signal

MUX24, MUX34: a fourth switching signal

MUX35: fifth switching signal

And (3) PDM: during the virtual scan

And (2) PDS: during display scan

PHS 1-PHS 4: during horizontal scanning

PPX: sub-pixel period

PTP: during touch scanning

PX: display pixel

S1, S2, S3: drive output point

SL11, SL21, SL31: first signal line

SL12, SL22, SL32: second signal line

SL13, SL23, SL33: third signal line

SL14, SL24, SL34: fourth signal line

SL35: fifth signal line

STP: touch signal

VP11 to VP13, VP21 to VP23, VP31 to VP34: pixel voltage

Claims

1. A touch display device, comprising:

a gate drive circuit for providing a plurality of sequentially enabled gate signals;

the touch display module is provided with a plurality of gate lines and a plurality of signal lines, and the gate lines are coupled with the gate driving circuit to respectively receive corresponding gate signals;

an integrated driving circuit having a driving output point; and

a multiplexer circuit, comprising:

a first multiplexing switch having a first end, a second end and a control end, wherein the first end of the first multiplexing switch is coupled to a first signal line of the plurality of signal lines in the touch display module, and the control end of the first multiplexing switch receives a first switch signal;

a second multiplexing switch having a first end, a second end and a control end, wherein the first end of the second multiplexing switch is coupled to the second end of the first multiplexing switch and a second signal line of the plurality of signal lines in the touch display module, the second end of the second multiplexing switch is coupled to the driving output point, the control end of the second multiplexing switch receives a second switch signal, and the second multiplexing switch is coupled to the first multiplexing switch in series; and

a third multiplexing switch having a first end, a second end and a control end, wherein the first end of the third multiplexing switch is coupled to a third signal line of the plurality of signal lines in the touch display module, the second end of the third multiplexing switch is coupled to the driving output point, and the control end of the third multiplexing switch receives a third switch signal.

2. The touch display device of claim 1, wherein the drive output node is directly coupled to a fourth signal line in the touch display module.

3. The touch display device according to claim 2, wherein an enabling period of the first switch signal partially overlaps an enabling period of the second switch signal, and an enabling period of the third switch signal does not overlap the enabling periods of the first switch signal and the second switch signal, wherein the enabling periods of the first switch signal and the second switch signal have the same time length.

4. The touch display device as claimed in claim 2, wherein the first signal line, the second signal line and the fourth signal line are coupled to a plurality of display pixels, and the third signal line is a touch sensing electrode.

5. The touch display device according to claim 4, wherein a single enable period of the first switch signal is partially within a horizontal scanning period of a display scanning period, a single enable period of the second switch signal is completely within the horizontal scanning period, and a single enable period of the third switch signal is equal to a touch scanning period.

6. The touch display device of claim 5, wherein the touch scan period is directly adjacent to a previous horizontal scan period, and at least one dummy scan period is provided between the touch scan period and a next horizontal scan period.

7. The touch display device of claim 1, wherein the multiplexer circuit further comprises:

a fourth multiplexing switch having a first terminal coupled to a fifth signal line in the touch display module and the second terminal of the third multiplexing switch, a second terminal coupled to the driving output point, and a control terminal for receiving a fourth switch signal,

wherein the second terminal of the third multiplexing switch is coupled to the driving output point via the fourth multiplexing switch.

8. The touch display device of claim 7, wherein the enabling periods of the first switch signal, the second switch signal, and the fourth switch signal are partially overlapped with each other, the enabling period of the third switch signal is covered by the corresponding enabling period of the fourth switch signal, and the enabling periods of the first switch signal and the second switch signal have the same time length.

9. The touch display device of claim 8, wherein the first signal line, the second signal line, and the fifth signal line are coupled to a plurality of display pixels, and the third signal line is a touch sensing electrode.

10. The touch display device of claim 9, wherein a single enable period of the first switch signal is partially within a horizontal scanning period of a display scanning period, a single enable period of the second switch signal is completely within the horizontal scanning period, and a single enable period of the third switch signal is equal to a touch scanning period.

11. The touch display device of claim 10, wherein the touch scan period is directly adjacent to a previous horizontal scan period, and at least one dummy scan period is provided between the touch scan period and a next horizontal scan period.

12. The touch display device of claim 1, wherein the multiplexer circuit further comprises:

a fifth multiplexing switch having a first end and a second end coupled to a sixth signal line in the touch display module, and a control end for receiving a fifth switch signal; and

a sixth multiplexing switch having a first end coupled to the second end of the fifth multiplexing switch and a seventh signal line in the touch display module, a second end coupled to the driving output point, and a control end for receiving a sixth switch signal.

13. The touch display device of claim 12, wherein the enabling periods of the first switch signal, the second switch signal, the fifth switch signal, and the sixth switch signal are sequentially overlapped with each other, the enabling period of the third switch signal is not overlapped with the enabling periods of the first switch signal, the second switch signal, the fifth switch signal, and the sixth switch signal, and the time lengths of the enabling periods of the first switch signal, the second switch signal, the fifth switch signal, and the sixth switch signal are completely the same.

14. The touch display device of claim 13, wherein the first signal line, the second signal line, the sixth signal line, and the seventh signal line are coupled to a plurality of display pixels, and the third signal line is a touch sensing electrode.

15. The touch display device of claim 14, wherein a single enable period of the first switch signal is partially within a horizontal scanning period of a display scanning period, a single enable period of the second switch signal, the fifth switch signal, and the sixth switch signal is completely within the horizontal scanning period, and a single enable period of the third switch signal is equal to a touch scanning period.

16. The touch display device of claim 15, wherein the touch scan period is directly adjacent to a previous horizontal scan period, and at least one dummy scan period is provided between the touch scan period and a next horizontal scan period.