TWI703480B - Touch display apparatus - Google Patents

Abstract

A touch display device includes a touch display module, an integrated drive circuit, and a multiplexer circuit. The integrated drive circuit has a drive output point. The multiplexer circuit includes first to third multiplexer switches. The first multiplex switch has a first end coupled to a first signal line in the touch display module, a second end, and a control end receiving a first switch signal. The second multiplex switch has a first end coupled to the second end of the first multiplex switch and a second signal line in the touch display module, a second end coupled to the drive output point, and a control end receiving a second switch signal. The third multiplex switch has a first end coupled to a third signal line in the touch display module, a second end coupled to the drive output point, and a control end receiving a third switch signal.

Description

Touch display device

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

With the development of semiconductor technology, the touch module and the display panel have been integrated into a single component, and the driving circuit for driving the touch module and the display panel has also been integrated into an integrated touch and display chip (TDDI). In addition, in order to reduce the size of the integrated touch and display chip, a multiplexer circuit is arranged between the integrated touch and display chip and the touch display panel to reduce the number of output channels of the integrated touch and display chip (that is, output Number of pins). However, as the number of output channels decreases, the multiplexer circuit needs more control signals and switching elements (such as transistors), but more switching elements require more response time, which may affect the touch display panel drive Timing. Therefore, how to improve the circuit operation of the multiplexer circuit is an important issue.

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

The touch display device of the present invention includes 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 multiplex switch, a second multiplex switch, and a third multiplex switch. The first multiplex switch has a first end, a second end and a control end. The first end of the first multiplex switch is coupled to the first signal line in the contact control display module, and the control end of the first multiplex switch receives the A control terminal for switching signals. The second multiplex switch has a first end, a second end, and a control end. The first end of the second multiplex switch is coupled to the second end of the first multiplex switch and the second signal line in the touch display module , The second end of the second multiplex switch is coupled to the drive output point, and the control end of the second multiplex switch receives the second switch signal. The third multiplex switch has a first end, a second end and a control end. The first end of the third multiplex switch is coupled to the third signal line in the contact control display module, and the second end of the third multiplex switch is coupled Connected to the drive output point, the control terminal of the third multiplex switch receives the third switch signal.

Based on the above, in the touch display device of the embodiment of the present invention, the multiplexer circuit of the multiplexer circuit is configured with at least one set of the first multiplexer switch and the second multiplexer switch in series, and provides the first switch signal that is sequentially enabled And the second switch signal. In this way, the multiplexer circuit only needs to consider the rise time of one switch signal to reduce the influence of the transition time of the switch.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of related technologies and the present invention, and will not be interpreted as idealized or excessive The formal meaning, unless explicitly defined as such in this article.

It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and/or parts, these elements, components, regions, and/or Or part should not be restricted 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. Therefore, the “first element”, “component”, “region”, “layer” or “portion” discussed below may be referred to as a second element, component, region, layer or section without departing from the teachings herein.

The terminology used here is only for the purpose of describing specific embodiments and is not limiting. As used herein, unless the content clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms, including "at least one." "Or" means "and/or". As used herein, the term "and/or" includes any and all combinations of one or more of the related listed items. It should also be understood that when used in this specification, the terms "including" and/or "including" designate the presence of the features, regions, wholes, steps, operations, elements, and/or components, but do not exclude one or more The existence or addition of other features, regions as a whole, steps, operations, elements, components, and/or combinations thereof.

FIG. 1A is a schematic circuit diagram of the touch display device according to the first embodiment of the present invention. 1A, in this embodiment, the touch display device 100 includes at least a gate driving circuit 110, a touch display module 120, a plurality of multiplexer circuits 130, and an integrated driving circuit 140, where the integrated driving circuit 140 It includes a source (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 required control signals and/or switching signals. The embodiment of the present invention does not take this as limit.

The gate driving circuit 110 is used to provide a plurality of gate signals (such as G1, G2, G3) that are sequentially enabled. The touch display module 120 is configured with a plurality of gate lines GL, a plurality of signal lines (such as the first signal line SL11 to the fourth signal line SL14), and a plurality of display pixels PX, wherein the first signal line SL11 to the third signal line SL11 The signal lines SL13 are respectively data lines coupled to the corresponding display pixels PX, and the fourth signal lines SL14 are touch sensing electrodes of the touch module. The gate line GL is coupled to the gate driving circuit 110 to respectively receive corresponding gate signals (such as G1, G2, G3), and the display pixel PX is coupled to the corresponding gate line GL to respectively receive the corresponding gate Polar signals (such as G1, G2, G3).

The integrated driving circuit 140 has a plurality of driving output points (such as 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 the driving output points (such as S1, S2, S3), and transmits the pixel voltage provided by the integrated driving circuit 140 to the first signal line SL11 to the third signal line SL13, and provide the touch driving signal provided by the integrated driving circuit 140 to the fourth signal line SL14.

In this embodiment, the multiplexer circuit 130 includes a first multiplex switch M11, a second multiplex switch M12, and a third multiplex switch M13. The first multiplex switch M11, the second multiplex switch M12, and the third multiplex switch M12 The multiplex switch M13 uses a transistor as an example, but the embodiment of the present invention is not limited thereto.

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

FIG. 1B is a schematic diagram explaining the timing of the touch display device shown in FIG. 1A. 1A and 1B, in this embodiment, one screen period (not shown) includes at least one touch scan period PTP and at least two display scan period PDS, that is, each touch scan period PTP can Configured between the two display scan periods PDS. Each display scanning period PDS includes at least multiple horizontal scanning periods (such as PHS1~PHS3), and each horizontal scanning period (such as PHS1~PHS3) includes three sub-pixel periods PPX, that is, the display pixel PX division of each column Drive (and write) sequentially for the three parts. The foregoing is an example for illustration, and the embodiment of the present invention is not limited thereto.

Furthermore, the time length of the single enable period of the first switch signal MUX11 and the second switch signal MUX12 is also two sub-pixel periods PPX, and the enable period of the first switch signal MUX11 is earlier than that of the second switch signal MUX12 The enable period, and the single enable period of the first switch signal MUX11 and the single enable period of the second switch signal MUX12 overlap by one sub-pixel period PPX. However, the enable period of the third switch signal MUX13 does not overlap with the enable period of the first switch signal MUX11 and the second switch signal MUX12. That is, the third switch signal MUX13 is disabled during the horizontal scanning period (such as PHS1~PHS3).

Taking the horizontal scanning period PHS1 as an example, the first half or the second half of the single energy period of the first switch signal MUX11 (that is, a sub-pixel period PPX) is located in the horizontal scanning period PHS1. The single-enable period of the second switch signal MUX12 is completely within the horizontal scanning period PHS1, but the time length of the single-enable period of the second switch signal MUX12 is shorter than the time length of the horizontal scanning period PHS1 by approximately 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 (that is, the first multiplex switch M11 and the second multiplex switch M12 are both turned on), the output point S1 is driven to output (or Provided) the pixel voltage VP11 corresponding to the first signal line SL11; when the first switch signal MUX11 is disabled and the second switch signal MUX12 is enabled (that is, the first multiplex switch M11 is off and the second multiplex switch M12 is on ), the drive output point S1 outputs (or provides) the pixel voltage VP12 corresponding to the second signal line SL12; when the first switch signal MUX11 is enabled and the second switch signal MUX12 is disabled (that is, the first multiplexer switch M11 is turned on And the second multiplex switch M12 is disabled), the drive output point S1 outputs (or provides) the pixel voltage VP13 corresponding to the third signal line SL13, where the MUX11 is enabled to allow the MUX11 and MUX12 to have the same period.

The actions of the first multiplex switch M11 and the second multiplex switch M12 in other horizontal scanning periods (such as PHS2 and PHS3) can refer to the horizontal scanning period PHS1, which will not be repeated here. In this way, in each horizontal scanning period (such as PHS1~PHS3), that is, in the turn-on time of each gate line GL, since the switches are connected in series, only the fall time of two switching signals and one switching signal need to be considered The rise time of the switch reduces the influence of the transition time of the switch.

In this embodiment, the PTP during the touch scan period is assumed to be located between the horizontal scan period PHS2 and PHS3. Then, when the horizontal scanning period PHS2 ends, the first switch signal MUX11 and the second switch signal MUX12 remain disabled, and the third switch signal MUX13 is changed to enable to turn on the third multiplex switch M13, where the third switch signal The single enable period of MUX13 can be equal to the touch scan period PTP. At this time, the drive 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 (that is, the previous horizontal scanning period) can be directly adjacent to the touch control scanning period PTP, and between the horizontal scanning period PHS3 (that is, the next horizontal scanning period) and the touch scanning period PTP There is at least one virtual scanning period PDM, wherein the time length of the virtual scanning period PDM can be equal to the time length of the sub-pixel period PPX. When the virtual scanning period PDM is one (for example, one sub-pixel period PPX), the waveforms of the first switching signal MUX11 and the second switching signal MUX12 can be kept intact (that is, it is maintained as two sub-pixel periods PPX).

2A is a schematic circuit diagram of a touch display device according to a second embodiment of the invention. 1A and 2A, in this embodiment, the touch display device 200 is substantially the same as the touch display device 100, and the difference lies in the touch display module 220 and multiple multiplexer circuits 230.

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

In this embodiment, the multiplexer circuit 230 includes a first multiplex switch M21, a second multiplex switch M22, a third multiplex switch M23, and a fourth multiplex switch M24. The first multiplex switch M21, the second multiplex switch M24 The multiplexer switch M22, the third multiplexer switch M23, and the fourth multiplexer switch M24 use transistors as an example, but the embodiment of the present invention is not limited thereto.

The first multiplex switch M21 has a first terminal, a second terminal and a control terminal. The first terminal of the first multiplex switch M21 is coupled to the first signal line SL21 in the contact control display module 220, and the control terminal of the first multiplex switch M21 receives the first switch signal MUX21. It has a first end, a second end and a control end. The first end of the second multiplex switch M22 is coupled to the second end of the first multiplex switch M21 and the second signal line SL22 in the touch display module 220, and the second end of the second multiplex switch M22 is coupled to the corresponding The drive output point (such as S1, S2, S3) of the second multiplex switch M22 receives the control end of the second switch signal MUX22. The third multiplex switch M23 has a first terminal, a second terminal and a control terminal. The first end of the third multiplex switch M23 is coupled to the third signal line SL23 in the touch control display module 220, and the second end of the third multiplex switch M23 is coupled to the corresponding drive output point (such as S1, S2, S3) , The control terminal of the third multiplex switch M23 receives the third switch signal MUX23. The fourth multiplex switch M24 has a first terminal, a second terminal and a control terminal. The first end of the fourth multiplex switch M24 is coupled to the fourth signal line SL24 in the touch control display module 220. The second end of the fourth multiplex switch M24 is coupled to the first end of the third multiplex switch M23. The control terminal of the industrial switch M24 receives the fourth switch signal MUX24, and the second terminal of the fourth multiplex switch M24 is coupled to the drive output point (such as S1, S2, S3) via the third multiplex switch M23.

FIG. 2B is a schematic diagram explaining the timing of the touch display device shown in FIG. 2A. Please refer to FIG. 1B, FIG. 2A, and FIG. 2B, where the same or similar components use the same or similar reference numerals. In this embodiment, the first switch signal MUX21, the second switch signal MUX22, and the third switch signal MUX23 are sequentially enabled and overlap one sub-pixel period PPX in sequence, and the first switch signal MUX21 and the second switch signal The duration of the single enable period of MUX22 is also the two sub-pixel periods PPX, wherein the enable period of the first switch signal MUX21 is earlier than the enable period of the second switch signal MUX22, and the enable period of the second switch signal MUX22 The period is earlier than the enable period of the third switch signal MUX23. The enable period of the fourth switch signal MUX24 does not overlap with the enable period of the first switch signal MUX21 and the second switch signal MUX22, but is covered by the single enable period of the third switch signal MUX23. That is, the third switch signal MUX23 is enabled in each horizontal scanning period (such as PHS1~PHS3) and the touch scanning period PTP, and the fourth switch signal MUX24 is disabled in the horizontal scanning period (such as PHS1~PHS3) but caused Can be used in PTP during touch scan.

Taking the horizontal scanning period PHS1 as an example, the first half or the second half of the single energy period of the first switch signal MUX21 (that is, a sub-pixel period PPX) is located in the horizontal scanning period PHS1. The single-enable period of the second switch signal MUX22 and the third switch signal MUX23 is completely located in the horizontal scanning period PHS1, but the time length of the single-enable period of the second switch signal MUX22 and the third switch signal MUX23 is shorter than that of the horizontal scanning period PHS1 The length of time is approximately one sub-pixel period PPX.

In the horizontal scanning period PHS1, when the first switch signal MUX21 and the second switch signal MUX22 are both enabled but the third switch signal MUX23 is disabled (that is, the first multiplex switch M21 and the second multiplex switch M22 are both turned on but The third multiplex switch M23 is turned off), the drive output point S1 outputs (or provides) the pixel voltage VP21 corresponding to the first signal line SL21; when the second switch signal MUX22 and the third switch signal MUX23 are both enabled, but the first switch When the signal MUX21 is disabled (that is, the second multiplex switch M22 and the third multiplex switch M23 are on but the first multiplex switch M21 is off), the drive output point S1 outputs (or provides) the picture corresponding to the second signal line SL22 Element voltage VP22; when the first switch signal MUX21 and the third switch signal MUX23 are both enabled, and the second switch signal MUX22 is disabled (that is, the first multiplexer switch M21 and the third multiplexer switch M23 are turned on but the second The work switch M22 is turned off), and the drive output point S1 outputs (or provides) the pixel voltage VP23 corresponding to the third signal line SL23.

The actions of the first multiplexer switch M21, the second multiplexer switch M22, and the third multiplexer switch M23 in other horizontal scanning periods (such as PHS2 and PHS3) can refer to the horizontal scanning period PHS1, which will not be repeated here. In this way, in each horizontal scanning period (such as PHS1~PHS3), that is, in the turn-on time of each gate line GL, since the switches are connected in series, only the fall time of 3 switching signals and 1 switching signal need to be considered The rise time of the switch reduces the influence of the transition time of the switch.

In this embodiment, the PTP during the touch scan period is assumed to be located between the horizontal scan period PHS2 and PHS3. Then, when the horizontal scanning period PHS2 ends, the first switch signal MUX21 and the second switch signal MUX22 remain disabled, the third switch signal MUX23 remains enabled, and the fourth switch signal MUX24 is changed to enable to turn on the fourth switch signal. The multiplex switch M24, wherein the single enable period of the fourth switch signal MUX24 can be equal to the touch scan 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 this embodiment, the horizontal scanning period PHS2 (that is, the previous horizontal scanning period) can be directly adjacent to the touch control scanning period PTP, and between the horizontal scanning period PHS3 (that is, the next horizontal scanning period) and the touch scanning period PTP There is at least one virtual scanning period PDM, wherein the time length of the virtual scanning period PDM can be equal to the time length of the sub-pixel period PPX. When the virtual scanning period PDM is one (for example, one sub-pixel period PPX), the waveforms of the first switching signal MUX21 and the second switching signal MUX22 can be kept intact (that is, it is maintained as two sub-pixel periods PPX).

3A is a schematic circuit diagram of a touch display device according to a third embodiment of the invention. 1A and 3A, in this embodiment, the touch display device 300 is substantially the same as the touch display device 100, and the difference lies in the touch display module 320 and multiple multiplexer circuits 330.

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

In this embodiment, the multiplexer circuit 330 includes a first multiplex switch M31, a second multiplex switch M32, a third multiplex switch M33, a fourth multiplex switch M34, and a fifth multiplex switch M35. The multiplexer switch M31, the second multiplexer switch M32, the third multiplexer switch M33, the fourth multiplexer switch M34, and the fifth multiplexer switch M35 use transistors as an example, but the embodiment of the present invention is not limited thereto.

The first multiplex switch M31 has a first terminal, a second terminal and a control terminal. The first end of the first multiplex switch M31 is coupled to the first signal line SL31 in the contact control display module 320. The control end of the first multiplex switch M31 receives the first switch signal MUX31. The second multiplex switch M32 has a first terminal, a second terminal and a control terminal. The first end of the second multiplex switch M32 is coupled to the second end of the first multiplex switch M31 and the second signal line SL32 in the touch display module 320, and the second end of the second multiplex switch M32 is coupled to the corresponding The drive output point (such as S1, S2, S3) of the second multiplex switch M32 receives the control end of the second switch signal MUX32.

The third multiplex switch M33 has a first terminal, a second terminal and a control terminal. The first end of the third multiplex switch M33 is coupled to the third signal line SL33 in the touch control display module 320, and the control end of the third multiplex switch M33 receives the third switch signal MUX33. The fourth multiplex switch M34 has a first terminal, a second terminal and a control terminal. The first end of the fourth multiplex switch M34 is coupled to the second end of the third multiplex switch M33 and the fourth signal line SL34 in the touch display module 320, and the second end of the fourth multiplex switch M34 is coupled to the corresponding The control terminal of the fourth multiplex switch M34 receives the second switch signal MUX34 at the driving output points (such as S1, S2, S3).

The fifth multiplex switch M35 has a first terminal, a second terminal and a control terminal. The first end of the fifth multiplex switch M35 is coupled to the fifth signal line SL35 in the touch control display module 320, and the second end of the fifth multiplex switch M35 is coupled to the corresponding drive output point (such as S1, S2, S3) , The control terminal of the fifth multiplex switch M35 receives the five-switch signal MUX35.

3B is a schematic diagram explaining the timing of the touch display device shown in FIG. 3A. Please refer to FIG. 1B, FIG. 3A, and FIG. 3B, where the same or similar components use the same or similar reference numerals. In this example, each horizontal scanning period (such as PHS1~PHS4) includes four sub-pixel periods PPX, that is, the display pixel PX of each column is divided into four parts to be driven (and written) sequentially. In addition, 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 overlap one sub-pixel period PPX in sequence, and the first switch signal MUX31, the second switch signal The duration of the single enable period of the switch signal MUX32, the third switch signal MUX33, and the fourth switch signal MUX34 is also two sub-pixel periods PPX, wherein the enable period of the first switch signal MUX31 is earlier than the second switch signal MUX32 The enabling period of the second switching signal MUX32 is earlier than the enabling period of the third switching signal MUX33, and the enabling period of the third switching signal MUX33 is earlier than the enabling period of the fourth switching signal MUX34. The enable period of the fifth switch signal MUX35 does not overlap with the enable period of the first switch signal MUX31, the second switch signal MUX32, the third switch signal MUX33, and the fourth switch signal MUX34. That is, the fifth switch signal MUX35 is disabled in the horizontal scanning period (such as PHS1 to PHS4) but is 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 energy period of the first switch signal MUX31 (that is, a sub-pixel period PPX) is located in the horizontal scanning period PHS1. The single enable period of the second switch signal MUX32, the third switch signal MUX33, and the fourth switch signal MUX34 is completely within the horizontal scanning period PHS1, but the single enable period of the second switch signal MUX32, the third switch signal MUX33, and the fourth switch signal MUX34 The duration of the coincidence period is shorter than the duration of the horizontal scanning period PHS1, which 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 both enabled but the third switch signal MUX33 and the fourth switch signal MUX34 are both disabled (that is, the first multiplexer switch M31 and the second The multiplexer switches M32 are both turned on but the third multiplexer switch M33 and the fourth multiplexer switch M34 are both turned off), and the drive output point S1 outputs (or provides) the pixel voltage VP31 corresponding to the first signal line SL31. When the second switch signal MUX32 and the third switch signal MUX33 are both enabled but the first switch signal MUX31 and the fourth switch signal MUX34 are both disabled (that is, the second multiplex switch M32 and the third multiplex switch M33 are turned on but the A multiplex switch M31 and a fourth multiplex switch M34 are both turned off), and the drive output point S1 outputs (or provides) the pixel voltage VP32 corresponding to the second signal line SL32.

When the third switch signal MUX33 and the fourth switch signal MUX34 are both enabled but the first switch signal MUX31 and the second switch signal MUX32 are both disabled (that is, the third multiplexer switch M33 and the fourth multiplexer switch M34 are turned on but one The multiplex switch M31 and the second multiplex switch M32 are both off), and the drive output point S1 outputs (or provides) the pixel voltage VP33 corresponding to the third signal line SL33. When the first switch signal MUX31 and the fourth switch signal MUX34 are both enabled but the second switch signal MUX32 and the third multiplex switch M33 are both disabled (that is, the first multiplex switch M31 and the fourth multiplex switch M34 are turned on but The second multiplex switch M32 and the third multiplex switch M33 are both turned off), and the drive output point S1 outputs (or provides) the pixel voltage VP23 corresponding to the fourth signal line SL34.

The actions of the first multiplex switch M31, the second multiplex switch M32, the third multiplex switch M33, and the fourth multiplex switch M34 in other horizontal scanning periods (such as PHS2~PHS4) can refer to the horizontal scanning period PHS1, here I won't repeat it. In this way, in each horizontal scanning period (such as PHS1~PHS4), that is, during the turn-on time of each gate line GL, since the switches are connected in series, only the fall time of 4 switching signals and 1 switching signal need to be considered The rise time of the switch reduces the influence of the transition time of the switch.

In this embodiment, the PTP during the touch scan period is assumed to be between the horizontal scan periods PHS3 and PHS4. Then, when the horizontal scanning period PHS3 ends, the first switch signal MUX31 to the third switch signal MUX33 remain disabled, the fourth switch signal MUX34 changes to disable, and the fifth switch signal MUX35 changes to enable to turn on the Five multiplex switches M35, wherein the single enable period of the fifth switch signal MUX35 can be equal to the touch scan period PTP. At this time, the drive output point S1 outputs (or provides) the corresponding touch signal STP to the fifth signal line SL35 for touch sensing.

In this embodiment, the horizontal scanning period PHS3 (that is, the previous horizontal scanning period) can be directly adjacent to the touch control scanning period PTP, and the horizontal scanning period PHS4 (that is, the next horizontal scanning period) and the touch scanning period PTP are between There is at least one virtual scanning period PDM, wherein the time length of the virtual scanning period PDM can be equal to the time length of the sub-pixel period PPX. When the virtual scanning period PDM is one (for example, one sub-pixel period PPX), the waveforms of the first switch signal MUX31 to the fourth switch signal MUX34 can be kept intact (that is, it is maintained as two sub-pixel period PPX).

To sum up, in the touch display device of the embodiment of the present invention, at least one set of first multiplex switch and second multiplex switch connected in series is configured in the multiplexer circuit of the present invention, and the first multiplexer switch is sequentially enabled. Switch signal and second switch signal. In this way, the multiplexer circuit only needs to consider the rise time of one switch signal to reduce the influence of the transition time of the switch.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make slight changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be determined by the scope of the attached patent application.

100, 200, 300: touch display device 110: Gate drive circuit 120, 220, 320: touch display module 130, 230, 330: multiplexer circuit 140: Integrated drive circuit G1, G2, G3: gate signal GL: Gate line M11, M21, M31: the first multiplex switch M12, M22, M32: second multiplex switch M13, M23, M33: third multiplex switch M24, M34: the fourth multiplex switch M35: Fifth multiplex switch MUX11, MUX21, MUX31: the first switch signal MUX12, MUX22, MUX32: the second switch signal MUX13, MUX23, MUX33: third switch signal MUX24, MUX34: the fourth switch signal MUX35: Fifth switch signal PDM: during virtual scan PDS: Display during scanning PHS1~PHS4: During horizontal scan PPX: Sub-pixel period PTP: During touch scan PX: display pixels S1, S2, S3: drive output point SL11, SL21, SL31: the first signal line SL12, SL22, SL32: second signal line SL13, SL23, SL33: third signal line SL14, SL24, SL34: the fourth signal line SL35: Fifth signal line STP: Touch signal VP11~VP13, VP21~VP23, VP31~VP34: pixel voltage

FIG. 1A is a schematic circuit diagram of the touch display device according to the first embodiment of the present invention. FIG. 1B is a schematic diagram explaining the timing of the touch display device shown in FIG. 1A. 2A is a schematic circuit diagram of a touch display device according to a second embodiment of the invention. FIG. 2B is a schematic diagram explaining the timing of the touch display device shown in FIG. 2A. 3A is a schematic circuit diagram of a touch display device according to a third embodiment of the invention. 3B is a schematic diagram explaining the timing of the touch display device shown in FIG. 3A.

100: Touch display device

110: Gate drive circuit

120: Touch display module

130: Multiplexer circuit

140: Integrated drive circuit

G1, G2, G3: gate signal

GL: Gate line

M11: The first multiplex switch

M12: The second multiplex switch

M13: The third multiplex switch

MUX11: the first switch signal

MUX12: The second switch signal

MUX13: third switch signal

PX: display pixels

S1, S2, S3: drive output point

SL11: the first signal line

SL12: second signal line

SL13: third signal line

SL14: The fourth signal line

STP: Touch signal

Claims (16)

A touch display device includes: A touch display module; An integrated driving circuit with a driving output point; and A multiplexer circuit, including: A first multiplex switch having a first end, a second end and a control end, wherein the first end of the first multiplex switch is coupled to a first signal line in the touch display module, The control terminal of the first multiplex switch receives a first switch signal; A second multiplex switch has a first end, a second end and a control end, wherein the first end of the second multiplex switch is coupled to the second end of the first multiplex switch and the touch Controlling a second signal line in the display module, the second end of the second multiplex switch is coupled to the drive output point, and the control end of the second multiplex switch receives a second switch signal; and A third multiplex switch having a first end, a second end and a control end, wherein the first end of the third multiplex switch is coupled to a third signal line in the touch display module, The second terminal of the third multiplex switch is coupled to the drive output point, and the control terminal of the third multiplex switch receives a third switch signal. According to the touch display device described in claim 1, wherein the driving output point is directly coupled to a fourth signal line in the touch display module. The touch display device according to claim 2, wherein the enable period of the first switch signal partially overlaps the enable period of the second switch signal, and the enable period of the third switch signal does not overlap During the enabling periods of the first switching signal and the second switching signal, the lengths of the enabling periods of the first switching signal and the second switching signal are exactly the same. The touch display device according to 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. The touch display device according to claim 4, wherein the single energy period of the first switch signal is partly within a horizontal scanning period of a display scanning period, and the single energy period of the second switch signal Completely within the horizontal scanning period, the single-energy period of the third switch signal is equal to a touch scanning period. The touch display device according to claim 5, wherein the touch scan period is directly adjacent to the previous horizontal scan period, and there is at least one virtual scan period between the touch scan period and the next horizontal scan period. According to the touch display device described in item 1 of the scope of patent application, the multiplexer circuit further includes: A fourth multiplex switch has a first end coupled to a fifth signal line in the touch display module and the second end of the third multiplex switch, and a second end coupled to the drive output point Terminal, and a control terminal receiving a fourth switch signal, Wherein, the second end of the third multiplex switch is coupled to the drive output point via the fourth multiplex switch. For the touch display device described in claim 7, wherein the enabling periods of the first switching signal, the second switching signal, and the fourth switching signal partially overlap with each other, and the enabling of the third switching signal The period is covered by the corresponding enable period of the fourth switch signal, wherein the time lengths of the enable period of the first switch signal and the second switch signal are exactly the same. The touch display device according to claim 8, wherein the first signal line, the second signal line and the five signal lines are coupled to a plurality of display pixels, and the third signal line is a touch sensor Measure the electrode. The touch display device according to claim 9, wherein the single energy period of the first switch signal is partly located in a horizontal scanning period of a display scanning period, and the single energy period of the second switch signal Completely within the horizontal scanning period, the single-energy period of the third switch signal is equal to a touch scanning period. According to the touch display device described in claim 10, the touch scan period is directly adjacent to the previous horizontal scan period, and there is at least one virtual scan period between the touch scan period and the next horizontal scan period. According to the touch display device described in item 1 of the scope of patent application, the multiplexer circuit further includes: A fifth multiplexer switch having a second end, a second end, and a control end receiving a fifth switch signal that are coupled to a sixth signal line in the touch display module; and A sixth multiplex switch having a first end coupled to the second end of the fifth multiplex switch and a seventh signal line in the touch display module, and a first end coupled to the driving output point Two terminals and a control terminal receiving a sixth switch signal. For the touch display device described in claim 12, wherein the enabling periods of the first switch signal, the second switch signal, the fifth switch signal, and the sixth switch signal partially overlap each other in sequence, The enable period of the third switch signal does not overlap with the enable period of the first switch signal, the second switch signal, the fifth switch signal, and the sixth switch signal, wherein the first switch signal, the second switch signal The time lengths of the enable period of the switch signal, the fifth switch signal, and the sixth switch signal are completely the same. The touch display device according to 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 It is a touch sensing electrode. For the touch display device described in claim 14, wherein the single energy period of the first switch signal is partly within a horizontal scan period of a display scan period, and the second switch signal and the fifth switch The single energy period of the signal and the sixth switch signal is completely within the horizontal scanning period, and the single energy period of the third switch signal is equal to a touch scanning period. The touch display device according to claim 15, wherein the touch scan period is directly adjacent to the previous horizontal scan period, and there is at least one virtual scan period between the touch scan period and the next horizontal scan period.

Images