TWI710941B - Touch display apparatus - Google Patents

Abstract

A touch display apparatus having a touch sensing region is provided. The touch display apparatus includes a plurality of first electrodes, a plurality of second electrodes and a plurality of auxiliary electrodes. The first electrodes and the second electrodes are disposed in the touch sensing region. The first electrodes and the second electrodes intersect with each other and define a plurality of openings. During a touch time, the first electrodes are applied with a first signal and the second electrodes are applied with a second signal. The auxiliary electrodes are disposed in the touch sensing region and are overlapped with the openings. During a first period of the touch time, the auxiliary electrodes have a floating potential. During a second period of the touch time, the auxiliary electrodes are applied with a third signal and one of the first signal and the second signal is synchronized with the third signal.

Description

Touch display device

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

In recent years, touch functions have gradually become an indispensable part of many life applications, especially mobile devices equipped with touch display panels, such as smart phones and tablet computers, which are everywhere. According to the integration method of the display panel and the touch technology, the types of touch display technology can be divided into out-cell, on-cell, and in-cell. Furthermore, touch sensing technology can be divided into self-capacitance and mutual-capacitance based on different architectures and driving methods. Among them, mutual-capacitance touch sensing technology has many advantages. The advantages of multi-touch sensing have become the mainstream of touch technology.

As the thickness of the touch display device is gradually reduced, such as a flexible touch display device, the flexible substrate used generally has a thinner thickness. When there is an unexpected conductor (such as water droplets) with a floating potential on the touch surface, the thinner substrate thickness causes the capacitive coupling effect between this conductor and the conductive layer of the display panel (such as pixel electrodes, signal lines) ( Capacitive coupling effect) increases, causing unexpected touch signals to be generated. Therefore, how to improve the accuracy of touch sensing while meeting the needs of thinner and lighter touch display devices is one of the important issues of related manufacturers.

The present invention provides a touch display device with better touch performance.

The touch display device of the present invention has a touch sensing area. The touch display device includes a plurality of first electrodes, a plurality of second electrodes, and a plurality of auxiliary electrodes. The plurality of first electrodes and the plurality of second electrodes are arranged in the touch sensing area. The first electrodes intersect the second electrodes and define a plurality of openings. During the touch time, the first electrodes are input with a first signal, and the second electrodes are input with a second signal. The auxiliary electrodes are arranged in the touch sensing area and overlap the openings. In the first period of the touch time, these auxiliary electrodes have floating potentials. In the second period of the touch time, the auxiliary electrodes are input with a third signal, and one of the first signal and the second signal and the third signal are synchronized in timing.

In an embodiment of the present invention, in the above-mentioned touch display device, during the second time period, the other of the first signal and the second signal is a ground potential or a fixed potential.

In an embodiment of the present invention, in the above-mentioned touch display device, during the third period of the touch time, a fourth signal is input to a plurality of auxiliary electrodes, and the other of the first signal and the second signal is The four signals are synchronized in timing.

In an embodiment of the present invention, the touch sensing area of the aforementioned touch display device has a first area and a second area. The plurality of auxiliary electrodes include a plurality of first auxiliary electrodes located in the first area and a plurality of second auxiliary electrodes located in the second area, and the first auxiliary electrodes are electrically independent of the second auxiliary electrodes.

In an embodiment of the present invention, in the above-mentioned touch display device, in the second time period, the third signals transmitted by the plurality of first auxiliary electrodes and the first signals transmitted by the plurality of first electrodes are synchronized in time sequence. And the third signal transmitted by the plurality of second auxiliary electrodes and the second signal transmitted by the plurality of second electrodes are ground potential or fixed potential.

In an embodiment of the present invention, in the above-mentioned touch display device, during the third period of the touch time, a fourth signal is input to a plurality of auxiliary electrodes, and the other of the first signal and the second signal is The four signals are ground potential or fixed potential.

In an embodiment of the invention, the aforementioned touch display device further includes a pixel structure layer. The pixel structure layer is overlapped and arranged in the touch sensing area and has a plurality of light emitting areas. The plurality of first electrodes, the plurality of second electrodes, and the plurality of auxiliary electrodes do not overlap the light emitting regions of the pixel structure layer.

In an embodiment of the present invention, the auxiliary electrode of the aforementioned touch display device has a plurality of first extension portions and a plurality of second extension portions. The first extension portions and the light-emitting regions are alternately arranged in a first direction, and the second extension portions and the light-emitting regions are alternately arranged in a second direction, and the first direction intersects the second direction.

In an embodiment of the present invention, the above-mentioned touch display device further includes a plurality of connection electrodes electrically connected between the plurality of auxiliary electrodes. One of the first electrode and the second electrode belongs to the same film layer as the connecting electrodes.

In an embodiment of the present invention, the other one of the first electrode and the second electrode of the aforementioned touch display device and the plurality of auxiliary electrodes belong to the same film layer.

Based on the above, in the touch display device of an embodiment of the present invention, the auxiliary electrode is provided in the area where the first electrode and the second electrode are not provided in the touch sensing area, and during the touch time, the auxiliary electrode The transmitted signal is synchronized with the signal transmitted by the first electrode or the second electrode in time sequence, which can effectively suppress the capacitive coupling between the conductor with floating potential on the touch surface and the driving electrode of the display pixel, which helps Improve the touch recognition rate of the touch display device.

As used herein, "approximately", "approximately", "essentially", or "substantially" includes the stated value and the average value within the acceptable deviation range of the specific value determined by a person of ordinary skill in the art, taking into account all The measurement in question and the specific number of errors associated with the measurement (ie, the limitations of the measurement system). For example, "about" can mean within one or more standard deviations of the stated value, or, for example, within ±30%, ±20%, ±15%, ±10%, ±5%. Furthermore, "about", "approximately", "essentially", or "substantially" used in this article can be based on measurement properties, cutting properties, or other properties to select a more acceptable deviation range or standard deviation. Not one standard deviation applies to all properties.

In the drawings, the thickness of layers, films, panels, regions, etc., are exaggerated for clarity. It should be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements. As used herein, "connection" can refer to physical and/or electrical connection. Furthermore, "electrical connection" can mean that there are other components between the two components.

Reference will now be made in detail to the exemplary embodiments of the present invention, and examples of the exemplary embodiments are illustrated in the accompanying drawings. Whenever possible, the same component symbols are used in the drawings and descriptions to indicate the same or similar parts.

FIG. 1 is a schematic top view of a touch display device according to an embodiment of the invention. 2A and 2B are respectively enlarged schematic diagrams of the partial area I and the partial area II of the touch display device of FIG. 1. 3 is a schematic cross-sectional view of the touch display device of FIG. 1. 4 is a schematic diagram of input signals of the first electrode, the second electrode and the auxiliary electrode of the touch display device of FIG. 1 during the touch time. In particular, for clarity of presentation, FIG. 1 omits the light-emitting area LR of FIGS. 2A, 2B, and 3, and the protective layer 101, insulating layer 120, cladding layer 130, adhesive layer 150, and display panel of FIG. 3 200 is shown.

1 and 3, the touch display device 10 includes a touch panel 100, an adhesive layer 150, and a display panel 200. The adhesive layer 150 is located between the touch panel 100 and the display panel 200 and is configured to adhere the touch panel 100 to the display panel 200. In other words, the touch display device 10 of this embodiment adopts an out-cell touch display technology. However, the present invention is not limited to this. According to other embodiments, the touch display device may also adopt on-cell or in-cell touch display technology. On the other hand, in this embodiment, the touch panel 100 is connected to the display panel 200 in a direct bonding manner, but the invention is not limited to this. In other embodiments, the touch panel 100 may also be connected to the display panel 200 by means of air bonding.

Furthermore, the touch panel 100 includes a touch substrate 110, a plurality of first electrodes TE1, a plurality of second electrodes TE2, and a plurality of auxiliary electrodes AE. The touch substrate 110 has a touch sensing area TSR, and the first electrodes TE1 and the second electrodes TE2 are disposed in the touch sensing area TSR. In this embodiment, the first electrodes TE1 are arranged along the direction D2 and extend in the direction D1, and the second electrodes TE2 are arranged along the direction D1 and extend in the direction D2. More specifically, the first electrodes TE1 intersect the second electrodes TE2 and define a plurality of openings OP, and a plurality of auxiliary electrodes AE are arranged in the openings OP.

On the other hand, in this embodiment, the first electrode TE1, the second electrode TE2, and the auxiliary electrode AE are disposed between the display panel 200 and the touch substrate 110, but the invention is not limited to this. In other embodiments, the touch substrate 110 may also be disposed between the first electrode TE1, the second electrode TE2, and the auxiliary electrode AE and the display panel 200. For example, the thickness of the display panel 200 may be less than 200 microns. In other words, the touch display device 10 is, for example, a flexible touch display device. In an embodiment, the thickness of the display panel 200 may be less than 150 microns, but it is not limited thereto.

In this embodiment, the touch panel 100 may further include a plurality of connection parts AEc, a plurality of connection electrodes CP and an insulating layer 120. The connecting portions AEc and the auxiliary electrodes AE are alternately arranged in the direction D1, and are electrically connected to two adjacent auxiliary electrodes AE arranged in the direction D1. The connecting electrodes CP and the auxiliary electrodes AE are alternately arranged in the direction D2, and are electrically connected to two adjacent auxiliary electrodes AE arranged in the direction D2. Specifically, the insulating layer 120 is disposed between the first electrode TE1 and the second electrode TE2, and has a plurality of contact windows 120a and a plurality of contact windows 120b. The connection electrode CP is electrically connected to the corresponding two auxiliary electrodes AE through the contact window 120a and the contact window 120b of the insulating layer 120. In order to simplify the manufacturing process of the touch display device 10, the auxiliary electrode AE, the connecting portion AEc, and the first electrode TE1 may selectively belong to the same film layer, and the connecting electrode CP and the second electrode TE2 may selectively belong to the same film layer. However, the present invention is not limited to this. In other embodiments, the auxiliary electrode AE, the connecting portion AEc, and the second electrode TE2 may also belong to the same film layer, and the connecting electrode CP and the first electrode TE1 may also belong to the same film layer.

Specifically, the auxiliary electrodes AE are electrically connected to each other through the connecting electrodes CP and the connecting portions AEc, and the auxiliary electrodes AE can be connected to one located in the peripheral area PR through only one connecting wire CL. The pin (not shown) is electrically connected. For example, this pin can be connected to a flexible printed circuit board (not shown) to electrically connect to a signal source (not shown). The flexible printed circuit board includes, for example, a chip on film (COF) ), or other suitable transmission circuit boards, but not limited to this. In this embodiment, the touch panel 100 may further include a coating layer 130 and a protective layer 101. The covering layer 130 covers a part of the surface of the plurality of second electrodes TE2 and the insulating layer 120. The protective layer 101 is disposed on the surface of the touch substrate 110 away from the first electrode TE1 to achieve a protective effect.

In this embodiment, at the intersection of the first electrode TE1 and the second electrode TE2 (for example, the local area I of FIG. 1), the first electrode TE1 can selectively completely overlap with the touch substrate 110 in the normal direction. The second electrode TE2 (as shown in FIG. 2A), but the invention is not limited to this. In other embodiments, at the intersection of the first electrode TE1 and the second electrode TE2, the first electrode TE1 may also partially overlap the second electrode TE2 in the normal direction of the touch substrate 110.

In this embodiment, the materials of the first electrode TE1, the second electrode TE2, and the auxiliary electrode AE may include alloys, nitrides of metallic materials, oxides of metallic materials, oxynitrides of metallic materials, or other suitable materials, Or a stacked layer of metal materials and other conductive materials. However, the present invention is not limited to this. In other embodiments, the first electrode TE1, the second electrode TE2, and the auxiliary electrode AE may also be light-transmitting electrodes, and the material of the light-transmitting electrodes may include metal oxides. For example: indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, or other suitable oxides, or a stacked layer of at least two of the foregoing.

On the other hand, the display panel 200 includes a driving circuit substrate 210 and a pixel structure layer 220. The pixel structure layer 220 is disposed on the driving circuit substrate 210 and overlaps the touch sensing area TSR. In this embodiment, the pixel structure layer 220 includes a pixel definition layer PD, a display medium layer DM, a pixel electrode PE, and a common electrode CE. The display medium layer DM is, for example, an organic light emitting material layer, and is disposed in the plurality of grooves PDa of the pixel definition layer PD. That is, the grooves PDa of the pixel definition layer PD can define a plurality of light-emitting regions LR (or pixel regions) of the pixel structure layer 220. The pixel electrode PE and the common electrode CE are respectively located on opposite sides of the display medium layer DM. More specifically, the display panel 200 of this embodiment is an organic light emitting diode panel (OLED Panel) panel. However, the present invention is not limited to this. According to other embodiments, the display panel may also be a liquid crystal display panel (LCD Panel).

In this embodiment, the display panel 200 may further include an encapsulation layer 230 covering the pixel structure layer 220. For example, in order to increase the flexibility of the touch display device 10, the encapsulation layer 230 is implemented in a thin film encapsulation (TFE) manner, but the invention is not limited thereto. In particular, in other embodiments not shown, the touch panel may further include a polarizer. The polarizer is disposed between the protective layer 101 and the touch substrate 110, and is, for example, a circular polarizer, so as to improve the display contrast of the touch display device including the organic light emitting diode panel. In another embodiment not shown, the touch panel may further include a color filter layer, and the color filter layer is disposed between the touch substrate 110 and the second electrode TE2. Accordingly, the color performance of the touch display device including the organic light emitting diode panel can be improved.

2A and 2B at the same time, in this embodiment, the first electrode TE1, the second electrode TE2 and the auxiliary electrode AE do not overlap the light-emitting area LR of the pixel structure layer 220 in the normal direction of the touch substrate 110 . Specifically, the first electrode TE1, the second electrode TE2, and the auxiliary electrode AE may respectively have a plurality of first extension portions and second extension portions, and the first extension portions are arranged along the direction D1 and extend in the direction D2. The second extension parts are arranged along the direction D2 and extend in the direction D1. In this embodiment, the direction D1 can be substantially perpendicular to the direction D2, but it is not limited thereto.

For example, the first extension TE1a of the first electrode TE1 (or the first extension TE2a of the second electrode TE2) and the light emitting area LR are alternately arranged along the direction D1, and the second extension TE1b of the first electrode TE1 (Or the second extension portion TE2b of the second electrode TE2) and the light emitting area LR are alternately arranged along the direction D2. Similarly, the first extension AEa of the auxiliary electrode AE and the light emitting area LR are alternately arranged along the direction D1, and the second extension AEb of the auxiliary electrode AE and the light emitting area LR are alternately arranged along the direction D2.

It should be noted that, in this embodiment, the light-emitting area between any two adjacent first extension portions TE1a of the first electrode TE1 (or any two adjacent first extension portions TE2a of the second electrode TE2) The number of LR and the number of light-emitting areas LR between any two adjacent first extensions AEa of the auxiliary electrode AE are illustrated by taking two and one as examples respectively, and it does not mean that the present invention uses the schematic disclosure content as limit. In other embodiments, the number of light-emitting areas LR between any two adjacent first extension portions TE1a of the first electrode TE1 (or any two adjacent first extension portions TE2a of the second electrode TE2) may also be One or more than three, and the number of light-emitting regions LR between any two adjacent first extension portions AEa of the auxiliary electrode AE can also be more than two. Similarly, the present invention does not limit the number of light-emitting areas LR between any two adjacent second extensions of the first electrode TE1, the second electrode TE2, or the auxiliary electrode AE without the content of the figures.

The driving method of the touch display device 10 will be exemplarily described below. 1 and 4, the touch display device 10 has a display time (not shown) for displaying a screen and a touch time Tt for touch sensing in time sequence, and the display time and the touch time Tt can be alternately set in timing. It should be noted that, for clarity of presentation and description, FIG. 4 omits the illustration of the display time of the touch display device 10.

In this embodiment, during the touch time Tt, the first electrode TE1 is input with the first signal S1, and the second electrode TE2 is input with the second signal S2. The touch time Tt has a first period Tp1 and a second period Tp2. For example, in the first period Tp1 of the touch time Tt, the first signal S1 transmitted by the first electrode TE1 may be the driving signal DS1, and the second signal S2 transmitted by the second electrode TE2 may be the sensing signal SS . That is, at this time, the first electrode TE1 may be a driving electrode, the second electrode TE2 may be a sensing electrode, and the touch panel 100 is operated in a mutual-capacitance sensing mode. It is worth mentioning that during the first period Tp1 of the touch time Tt, the auxiliary electrode AE may have a floating potential to avoid affecting the operation of the first electrode TE1 and the second electrode TE2 in the mutual capacitance sensing mode The electrical properties of the next.

Further, in the second period Tp2 of the touch time Tt, the first signal S1 transmitted by the first electrode TE1 may be the driving signal DS2, and the second signal S2 transmitted by the second electrode TE2 may be ground potential or fixed Potential. More specifically, the touch panel 100 at this time is operated in a self-capacitance sensing mode through the driving and sensing of the first electrode TE1. It is worth noting that during the second time period Tp2 of the touch time Tt, the auxiliary electrode AE is input to the third signal S3, and the third signal S3 is synchronized with the first signal S1 (ie, the driving signal DS2) in timing. Accordingly, it is possible to effectively reduce the capacitive coupling effect (capacitive coupling effect) between the conductive layer (such as the common electrode CE) of the display panel 200 and the conductive layer (such as the common electrode CE) of the unintended conductor (such as water droplets) having a floating potential on the touch surface. The self-capacitance change of, helps to improve the touch recognition rate of the touch display device 10.

Similarly, in the third period Tp3 of the touch time Tt, the first signal S1 transmitted by the first electrode TE1 may be a ground potential or a fixed potential, and the second signal S2 transmitted by the second electrode TE2 may be the driving signal DS3 . More specifically, the touch panel 100 at this time is operated in the self-capacitance sensing mode through the driving and sensing of the second electrode TE2. It is worth noting that during the third time period Tp3 of the touch time Tt, the auxiliary electrode AE is input to the fourth signal S4, and the fourth signal S4 and the second signal S2 (ie, the driving signal DS3) are synchronized in timing. Accordingly, it is possible to effectively reduce the capacitive coupling effect (capacitive coupling effect) between the conductive layer (such as the common electrode CE) of the display panel 200 and the conductive layer (such as the common electrode CE) of the unintended conductor (such as water droplets) having a floating potential on the touch surface. The self-capacitance change of, helps to improve the touch recognition rate of the touch display device 10.

In particular, through the self-capacitive sensing in the second time period Tp2 and the third time period Tp3, the position of an unexpected conductor (such as a water droplet) with a floating potential on the touch surface can be identified, and through The position information will be corrected by the touch information obtained by mutual capacitance sensing, so as to improve the recognition rate of the conductor (for example, finger) that implements the touch. In other words, the touch recognition rate of the touch display device 10 can be improved. It is worth mentioning that during the touch time Tt, through the self-capacitance sensing of the first electrode TE1 and the second electrode TE2, the touch position of the conductor (for example, a finger) that implements the touch can also be pre-scanned. Accordingly, the number of electrodes to be scanned during mutual capacitance sensing can be reduced, which helps to reduce the operating time of mutual capacitance sensing.

It should be noted that although the touch time Tt in this embodiment is presented in the order of the first time period Tp1, the second time period Tp2, and the third time period Tp3, it does not mean that the present invention is limited thereto. Those with ordinary knowledge in the technical field of the present invention should understand that the sequence of these periods can be adjusted according to actual design requirements. For example, in order to achieve the pre-scan function, the second period Tp2 and the third period Tp3 are automatically set. The capacitance sensing may be earlier than the mutual capacitance sensing in the first period Tp1.

Hereinafter, another embodiment will be listed to describe the disclosure in detail, wherein the same components will be marked with the same symbols, and the description of the same technical content will be omitted. For the omitted parts, please refer to the foregoing embodiments, and will not be repeated hereafter.

5 is a schematic top view of a touch display device according to another embodiment of the invention. 6 is a schematic diagram of input signals of the first electrode, the second electrode and the first auxiliary electrode of the touch display device of FIG. 5 during the touch time. FIG. 7 is a schematic diagram of input signals of the first electrode, the second electrode and the second auxiliary electrode of the touch display device of FIG. 5 during the touch time.

Referring to FIG. 5, the main difference between the touch display device 20 of this embodiment and the touch display device 10 of FIG. 1 is that the touch sensing area and the auxiliary electrode are arranged differently. Specifically, the touch sensing area TSR of the touch display device 20 has a first area TSR1 and a second area TSR2, and the plurality of auxiliary electrodes includes a plurality of first auxiliary electrodes AE1 located in the first area TSR1 and located in the second area A plurality of second auxiliary electrodes AE2 of TSR2, and these first auxiliary electrodes AE1 are electrically independent of these second auxiliary electrodes AE2.

In this embodiment, the plurality of first auxiliary electrodes AE1 are electrically connected to each other through the plurality of connecting electrodes CP1 and the plurality of connecting portions AEc1, and through the connecting wiring CL1 and a pin located in the peripheral area PR ( Not shown) Electrical connection. The plurality of second auxiliary electrodes AE2 are electrically connected to each other through the plurality of connecting electrodes CP2 and the plurality of connecting portions AEc2, and are connected to another pin (not shown) located in the peripheral area PR through another connecting wire CL2 ) Electrical connection. In other words, each of the first auxiliary electrode AE1 and the second auxiliary electrode AE2 can be independently controlled.

The driving method of the touch display device 20 will be exemplarily described below. 6 and 7 at the same time, the touch display device 20 has a display time (not shown) for displaying a screen and a touch time Tt for touch sensing in time sequence, and the display time and the touch The time Tt can be alternately set in timing. It should be noted that, for clarity of presentation and description, the display time of the touch display device 20 is omitted in FIGS. 6 and 7.

In this embodiment, during the touch time Tt, the first electrode TE1 is input with the first signal S1, and the second electrode TE2 is input with the second signal S2. The touch time Tt has a first period Tp1 and a second period Tp2. For example, in the first period Tp1 of the touch time Tt, the first signal S1 transmitted by the first electrode TE1 may be the driving signal DS1, and the second signal S2 transmitted by the second electrode TE2 may be the sensing signal SS . That is, at this time, the first electrode TE1 may be a driving electrode, the second electrode TE2 may be a sensing electrode, and the touch panel 100 is operated in a mutual-capacitance sensing mode. It is worth mentioning that during the first period Tp1 of the touch time Tt, the auxiliary electrode AE may have a floating potential to avoid affecting the operation of the first electrode TE1 and the second electrode TE2 in the mutual capacitance sensing mode The electrical properties of the next.

Further, in the second period Tp2 of the touch time Tt, the first signal S1 transmitted by the first electrode TE1 may be the driving signal DS2, and the second signal S2 transmitted by the second electrode TE2 may be ground potential or fixed Potential. More specifically, the touch panel 100 at this time is operated in a self-capacitance sensing mode through the driving and sensing of the first electrode TE1.

It is worth noting that during the second period Tp2 of the touch time Tt, the first auxiliary electrode AE1 is inputted with the third signal S3, and the third signal S3 is synchronized with the first signal S1 (ie, the driving signal DS2) in time sequence . According to this, it is possible to effectively reduce the capacitive coupling effect (capacitive coupling effect) generated by unexpected conductors (such as water droplets) with floating potential on the touch surface and the conductive layer (such as common electrodes) of the display panel. The amount of change in capacitance helps to improve the touch recognition rate of the touch display device 20. On the other hand, in the second period Tp2 of the touch time Tt, the third signal S3A transmitted by the second auxiliary electrode AE2 may be a ground potential or a fixed potential. For example, the fixed potential of the second auxiliary electrode AE2 may be different from the fixed potential of the second electrode TE2, but is not limited to this. In other embodiments, the fixed potential of the second auxiliary electrode AE2 may also be equal to the fixed potential of the second electrode TE2.

Similarly, in the third period Tp3 of the touch time Tt, the first signal S1 transmitted by the first electrode TE1 may be a ground potential or a fixed potential, and the second signal S2 transmitted by the second electrode TE2 may be the driving signal DS3 . More specifically, the touch display device 20 at this time is operated in the self-capacitance sensing mode through the driving and sensing of the second electrode TE2.

It is worth noting that during the third period Tp3 of the touch time Tt, the first auxiliary electrode AE1 is inputted with the fourth signal S4A, and the fourth signal S4A may have a ground potential or a fixed potential. For example, the fixed potential of the first auxiliary electrode AE1 may be different from the fixed potential of the first electrode TE1, but is not limited to this. In other embodiments, the fixed potential of the first auxiliary electrode AE1 may also be equal to the fixed potential of the first electrode TE1. On the other hand, in the third period Tp3 of the touch time Tt, the fourth signal S4 transmitted by the second auxiliary electrode AE2 and the second signal S2 (ie, the driving signal DS3) transmitted by the second electrode TE2 are synchronized in timing. . According to this, it is possible to effectively reduce the capacitive coupling effect (capacitive coupling effect) generated by unexpected conductors (such as water droplets) with floating potential on the touch surface and the conductive layer (such as common electrodes) of the display panel. The amount of change in capacitance helps to improve the touch recognition rate of the touch display device 20.

In particular, the partition arrangement of the auxiliary electrode can reduce the overall resistance of the auxiliary electrode. At the same time, the number of times the auxiliary electrode is synchronized with the two electrodes in timing can be reduced. For example, the first auxiliary electrode AE1 only needs to be synchronized with the transmission signal of the first electrode TE1 in the second time period Tp2, and does not need to be in the third time period Tp3. Synchronize with the transmission signal of the second electrode TE2; similarly, the second auxiliary electrode AE2 only needs to be synchronized with the transmission signal of the second electrode TE2 in the third period Tp3, and does not need to be synchronized with the transmission signal of the first electrode TE1 in the second period Tp2. The transmission signal is synchronized. In other words, the overall operating power consumption of the auxiliary electrode can also be reduced.

It should be noted that, in this embodiment, the number of partitions of the touch sensing area is exemplified by taking two as an example, which does not mean that the present invention is limited by the content of the drawings. In other embodiments, the number of partitions of the touch sensing area (or the number of groups of auxiliary electrodes) can also be adjusted to three according to actual design requirements (for example, the resistance of the auxiliary electrode or operating power consumption).

In summary, in the touch display device of an embodiment of the present invention, the auxiliary electrode is provided in the area where the first electrode and the second electrode are not provided in the touch sensing area, and during the touch time, this The signal transmitted by the auxiliary electrode is synchronized with the signal transmitted by the first electrode or the second electrode in time sequence, which can effectively suppress the capacitive coupling between the conductor with a floating potential on the touch surface and the driving electrode of the display pixel. Helps improve the touch recognition rate of the touch display device.

10.20: Touch display device 100: Touch panel 101: protective layer 110: touch substrate 120: insulating layer 120a, 120b: contact window 130: Overlay 150: Adhesive layer 200: display panel 210: Drive circuit substrate 220: Pixel structure layer 230: encapsulation layer AE, AE1, AE2: auxiliary electrode AEa, TE1a, TE2a: first extension AEb, TE1b, TE2b: second extension AEc, AEc1, AEc2: connecting part CE: Common electrode CL, CL1, CL2: connection wiring CP, CP1, CP2: connecting electrodes DM: display medium layer DS1, DS2, DS3: drive signal D1, D2: direction LR: Light-emitting area OP: opening PD: pixel definition layer PDa: groove PE: pixel electrode PR: Peripheral area SS: sense signal S1: First signal S2: second signal S3, S3A: third signal S4, S4A: fourth signal TE1: first electrode TE2: second electrode Tp1: first period Tp2: second period Tp3: third period TSR: Touch sensing area TSR1: Zone 1 TSR2: Zone 2 Tt: Touch time I, II: area

FIG. 1 is a schematic top view of a touch display device according to an embodiment of the invention. 2A and 2B are enlarged schematic diagrams of two partial regions of the touch display device in FIG. 1. 3 is a schematic cross-sectional view of the touch display device of FIG. 1. 4 is a schematic diagram of input signals of the first electrode, the second electrode and the auxiliary electrode of the touch display device of FIG. 1 during the touch time. 5 is a schematic top view of a touch display device according to another embodiment of the invention. 6 is a schematic diagram of input signals of the first electrode, the second electrode and the first auxiliary electrode of the touch display device of FIG. 5 during the touch time. FIG. 7 is a schematic diagram of input signals of the first electrode, the second electrode and the second auxiliary electrode of the touch display device of FIG. 5 during the touch time.

10: Touch display device

110: touch substrate

120a, 120b: contact window

AE: auxiliary electrode

AEc: Connection part

CL: Connection routing

CP: Connect electrode

D1, D2: direction

OP: opening

PR: Peripheral area

TE1: first electrode

TE2: second electrode

TSR: Touch sensing area

I, II: area

Claims (9)

A touch display device has a touch sensing area. The touch display device includes: a plurality of first electrodes and a plurality of second electrodes, arranged in the touch sensing area, and the first electrodes intersect at The second electrodes define a plurality of openings. During the touch time, the first electrodes are input with a first signal, and the second electrodes are input with a second signal; and a plurality of auxiliary electrodes are arranged in In the touch sensing area and overlap the openings, the auxiliary electrodes have a floating potential in a first period of the touch time, and in a second period of the touch time, The auxiliary electrodes are input with a third signal, and one of the first signal and the second signal is synchronized with the third signal in time sequence; and a plurality of connecting electrodes are electrically connected to one of the auxiliary electrodes Among them, one of the first electrode and the second electrode and the connecting electrodes belong to the same film layer. According to the touch display device described in claim 1, wherein in the second time period, the other of the first signal and the second signal is a ground potential or a fixed potential. The touch display device according to claim 1, wherein during a third period of the touch time, the auxiliary electrodes are input with a fourth signal, and the first signal and the second signal are The other one is synchronized with the fourth signal in timing. The touch display device according to claim 1, wherein the touch sensing area has a first area and a second area, and the auxiliary electrodes include a plurality of first auxiliary electrodes located in the first area and There are a plurality of second auxiliary electrodes in the second area, and the first auxiliary electrodes are electrically independent of the second auxiliary electrodes. The touch display device according to claim 4, wherein in the second time period, the third signal transmitted by the first auxiliary electrodes and the first signal transmitted by the first electrodes are The timing is synchronized, and the third signal transmitted by the second auxiliary electrodes and the second signal transmitted by the second electrodes are ground potential or fixed potential. The touch display device according to claim 1, wherein during a third period of the touch time, the auxiliary electrodes are input with a fourth signal, and the first signal and the second signal are The other and the fourth signal are ground potential or fixed potential. The touch display device described in claim 1 further includes: a pixel structure layer which is overlapped and arranged on the touch sensing area and has a plurality of light-emitting areas, wherein the first electrodes and the The second electrode and the auxiliary electrodes do not overlap the light-emitting regions of the pixel structure layer. The touch display device according to claim 7, wherein the auxiliary electrode has a plurality of first extensions and a plurality of second extensions, and the first extensions and the light-emitting areas are in a first side Alternately arranged upward, the second extension portions and the light-emitting regions are alternately arranged in a second direction, and the first direction intersects the second direction. According to the touch display device described in claim 1, wherein the other of the first electrode and the second electrode and the auxiliary electrodes belong to the same film layer.

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