TWI502430B - Touch control apparatus - Google Patents

Description

Touch display device

The present invention relates to the field of touch technologies, and in particular, to a touch display device.

At present, capacitive touch screens are widely used in various electronic products, and have gradually penetrated into various fields of work and life. The size of capacitive touch screens is increasing, from 3 inches to 6.1 inches for smartphones to 10 inches for tablets. The application of capacitive touch screens can be extended to smart TVs. However, the existing capacitive touch screens generally have problems such as poor anti-interference performance, low scanning frame rate, large volume, and complicated manufacturing process.

In view of this, the embodiments of the present disclosure provide a touch display device capable of solving at least one of the above problems.

A touch display device according to an embodiment of the present disclosure includes: a display touch screen, the display touch screen includes a first substrate, a second substrate, and is disposed between the first substrate and the second substrate a liquid crystal layer and a plurality of primitive units, the display touch screen further comprising a plurality of common electrodes, the plurality of common electrodes being arranged in a two-dimensional array; And a display touch control circuit including a display control circuit and a touch control circuit, the display touch control circuit and the plurality of common electrodes being connected by wires in a manner of: in a display phase, the plurality of public The electrodes are connected to a common level provided to the display control circuit; in the touch sensing phase, each of the plurality of common electrodes is connected to the touch control circuit as a touch sensing electrode, respectively.

Preferably, the wires are arranged in the same layer of the plurality of common electrodes; or the wires are arranged in different layers of the plurality of common electrodes, and are connected to the plurality of common electrodes through through holes.

Preferably, the wires are arranged in the same layer of the data line and are connected to the plurality of common electrodes through the through holes.

Preferably, the primitive unit includes a primitive electrode, and the wire is disposed on the same layer of the primitive electrode, and is connected to the plurality of common electrodes through the through hole.

Preferably, the wires are arranged directly below the Black Matrix.

Preferably, the display touch control circuit is a single wafer integrated with the display control circuit and the touch control circuit; or the display touch control circuit includes two or more wafers, the display control circuit And the touch control circuit is provided by a different chip; or the display touch control circuit comprises two or more The wafers, each of which is used to control a corresponding portion of the display touch screen.

Preferably, the display touch control circuit wafer is bonded to the first substrate or the second substrate in a chip-on-glass manner.

Preferably, the display control circuit wafer and the touch control circuit wafer are bonded to the first substrate or the second substrate in a chip-on-glass manner.

Preferably, the touch control circuit is configured to detect a self capacitance of each common electrode.

Preferably, the touch control circuit is configured to detect a self-capacitance of each common electrode by simultaneously driving a common electrode around the common electrode according to a signal applied to the common electrode; or according to being applied to the common The signal of the electrode drives the remaining common electrodes simultaneously.

Preferably, the touch control circuit is further configured to simultaneously drive the data lines according to a signal applied to the common electrode.

Preferably, the touch control circuit is configured to determine a touch location based on a two-dimensional array of capacitance changes.

Preferably, the display touch screen has an In-Plane Switching structure or a Fringe Field Switching structure or a Twisted Nematic structure.

Preferably, the shape of the common electrode is a regular polygon; or The shape of the common electrode is an elongated shape; or the shape of the common electrode is a circle; or the shape of the common electrode is an elliptical shape.

The common electrode may have serrations on its edges.

Preferably, the material of the plurality of common electrodes is a metal oxide such as indium tin oxide (ITO) or graphene.

Preferably, each of the primitive units of the display touch screen comprises a thin film transistor, and a source of each thin film transistor is provided with a driving circuit, and the driving circuit drives the thin film transistor through a data line.

Preferably, the touch display device comprises a plurality of touch control circuits, each touch control circuit connecting a corresponding one of the plurality of common electrodes.

Preferably, the clocks of the respective touch control circuits are synchronized; or each of the touch control circuits operates in a time-sharing manner.

According to the solution of the embodiments of the present disclosure, the common electrode is coated as a touch sensing electrode, and at least one touch sensing electrode layer is reduced compared with the prior art, thereby reducing the thickness and weight of the display touch screen, and reducing the additional touch sensing. The optical loss caused by the electrode layer can save material and manufacturing costs. Further, in the display touch screen provided by the embodiments of the present disclosure, the touch sensing electrodes (ie, the common electrodes in the touch sensing stage) are arranged in a two-dimensional array, and the electrodes do not interfere with each other, and the noise is not superimposed. , thus significantly reducing noise and improving the signal to noise ratio.

11‧‧‧First substrate

13‧‧‧second substrate

12‧‧‧Color filter layer

15‧‧‧Liquid layer

17‧‧‧Common electrode

18‧‧‧pixel electrode

19‧‧‧Thin Film Transistors

21‧‧‧First substrate

23‧‧‧second substrate

25‧‧‧Liquid layer

27‧‧‧Common electrode

1101-1120‧‧‧Common electrode (touch sensing electrode)

29‧‧‧ Display touch control circuit

101‧‧‧ first side

501-520‧‧‧Wire

102‧‧‧Second side

401‧‧‧Substrate

24‧‧‧Soft circuit board

61‧‧‧First substrate

63‧‧‧second substrate

65‧‧‧Liquid layer

67‧‧‧Common electrode

300‧‧‧ Sensing area

301-306‧‧‧Sub-area

700‧‧‧Communication bus

701-706‧‧‧Connecting wire

7‧‧‧Connecting wires

1-6‧‧‧ display touch chip

44‧‧‧Insulation

46‧‧‧LCD

14‧‧‧TFT array

400‧‧‧ glass substrate

9‧‧‧ polarizer

8‧‧‧Data line layer

1a is a side view of a touch display device according to a first embodiment of the present disclosure; FIG. 1b is a side view of a touch display device according to a first embodiment of the present disclosure; and FIG. 1c is a public view according to a first embodiment of the present disclosure. FIG. 1 is a schematic diagram of a display control circuit and a touch control circuit of a touch display device according to a first embodiment of the present disclosure; FIG. 1 e is a display touch control circuit of the touch display device according to the first embodiment of the present disclosure; 2A is a side view of a touch display device according to Embodiment 2 of the present disclosure; FIG. 2b is a plan view of a common electrode layer according to Embodiment 2 of the present disclosure; and FIG. 3 is a wire according to Embodiment 2 of the present disclosure; 4 is a side view of a wire wiring according to Embodiment 3 of the present disclosure; FIG. 5 is a side view of a wire wiring according to Embodiment 4 of the present disclosure; FIG. 6a is a side view according to Embodiment 5 of the present disclosure FIG. 6 is a side view of a wire wiring according to Embodiment 5 of the present disclosure; FIG. 7 is a side view of the touch display device according to Embodiment 6 of the present disclosure; FIG. 9 is a side view of a wire harness according to a seventh embodiment of the present disclosure; FIG. 10a is a touch display device according to Embodiment 8 of the present disclosure; FIG. 10b is based on A touch display device according to Embodiment 8 of the present disclosure.

In the following, the technical solutions of the embodiments of the present disclosure will be described in conjunction with the accompanying drawings in the embodiments of the present disclosure. It is to be understood that the described embodiments are only a part of the embodiments of the invention. Any other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without any creative work should fall within the protection scope of the present invention. For ease of explanation, the cross-sectional view showing the structure is not partially enlarged in accordance with the general scale. Moreover, the drawings are merely exemplary and should not be construed as limiting the scope of the invention. In addition, the actual production should include three-dimensional dimensions of length, width and depth.

Embodiment 1

A first embodiment of the present disclosure provides a touch display device, including: a touch display screen, the display touch screen includes a first substrate 11 and a second substrate 13, and is disposed on the first substrate and the second a liquid crystal layer 15 between the substrates and a plurality of primitive units, the display touch screen further comprising a plurality of common electrodes 17, the plurality of common electrodes being arranged in a two-dimensional array; and a display touch control circuit, the display The touch control circuit includes a display control circuit and a touch control circuit, the display touch control circuit and the plurality of common electrodes being connected by wires in a manner that the plurality of common electrodes are connected to the display control during a display phase a common level of the circuit; in the touch sensing phase, each of the plurality of common electrodes is connected to the touch control circuit as a touch sensing electrode, respectively.

The display touch screen may have an In-Plane Switching (IPS) structure or a Fringe Field Switching (FFS) structure or a Twisted Nematic (TN) structure.

FIG. 1a is a schematic side view of an example of a touch display device according to a first embodiment of the present disclosure. The touch display device may have an IPS or FFS structure.

FIG. 1b is a schematic side view of another example of a touch display device according to a first embodiment of the present disclosure. The touch display device can have a TN structure.

FIG. 1c illustrates an example of a common electrode layer of a touch display device according to a first embodiment of the present disclosure. Those skilled in the art will appreciate that the shape of the common electrode may be circular, elliptical, triangular, elongated, or square and other regular polygons. Furthermore, the common electrode may have serrations on its edges. Preferably, the material of the plurality of common electrodes is a metal oxide such as indium tin oxide (ITO) or graphene.

FIG. 1d illustrates an example of a display control circuit and a touch control circuit of a touch display device according to a first embodiment of the present disclosure. In this example, the touch display device can be connected to the host through a flexible circuit board. As shown in FIG. 1d, the display control circuit and the touch control circuit are two independent wafers, and the display control circuit is connected to the data line and the row control line of the liquid crystal display portion of the touch display device through wires, and the touch control circuit passes The wire is connected to the touch sensing electrode (common electrode) of the touch sensing portion, and the display/touch switching module inside the touch control circuit is made in the display stage a plurality of common electrodes connected to a common level provided to the display control circuit; each of the plurality of common electrodes being respectively connected to the touch control circuit as a touch sensing during a touch sensing phase electrode.

FIG. 1e illustrates another example of a display touch control circuit of a touch display device according to a first embodiment of the present disclosure. In this example, the touch display device can be connected to the host through a flexible circuit board. As shown in FIG. 1e, the display touch control circuit is a single chip, and the display touch control circuit is connected to the data line and the row control line of the liquid crystal display portion and the touch sensing electrode (common electrode) of the touch sensing portion, and is displayed by touch a display/touch switching module inside the control circuit such that in the display phase, the plurality of common electrodes are connected to a common level provided to the display control circuit; in the touch sensing phase, among the plurality of common electrodes Each is connected to the touch control circuit as a touch sensing electrode, respectively.

In the display phase, the common electrode is part of the display module of the display touch screen, driven by a common level (Vcom), and an electric field of different liquid crystal materials across different regions of the screen is formed with different primitive units, thereby controlling each The light throughput of the primitive unit.

Preferably, the primitive unit comprises a primitive transistor and a primitive electrode. For a color display module, each primitive unit generally includes three sub-element units corresponding to red, green, and blue, and each sub-element unit includes one primitive transistor and one primitive electrode.

Preferably, the primitive transistor is a thin film transistor (TFT).

In the touch sensing phase, the common electrode is covered as a touch sensor An electrode that senses the touch on the screen. The capacitance of the common electrode changes when the touch screen is touched.

Preferably, the touch location is determined by detecting the self capacitance of each common electrode. As an example, the self-capacitance of the common electrode can be its capacitance to ground.

In the prior art display touch screen, the touch sensing electrode is independent of the display module, and the display touch screen is a superposition of the touch screen and the display screen. According to the solution of the embodiment of the present disclosure, the common electrode is coated as a touch sensing electrode, and at least one touch sensing electrode layer is reduced compared with the prior art, thereby reducing the thickness and weight of the display touch screen and reducing the extra touch. The optical loss caused by the sensing electrode layer can save material and manufacturing costs. In addition, the solution of the embodiments of the present disclosure also reduces electrical interference between the touch sensing electrodes and the display module in the prior art.

Further, in the prior art display touch screen, the touch sensing electrodes are composed of row electrodes and column electrodes, and the noise on each row or column is superimposed. For example, if multiple fingers are placed in the same row or column, the power noise detected by each finger will be superimposed on the same row or column. The more fingers there are, the larger the noise is superimposed. In the display touch screen provided by the embodiment of the present disclosure, the touch sensing electrodes (ie, the common electrodes in the touch sensing stage) are arranged in a two-dimensional array, and each electrode is only one unit in the array, and the units do not interfere with each other. . Each row or column includes different matrix elements and does not cause a superposition of noise. Therefore, the touch display device according to an embodiment of the present disclosure significantly reduces the amplitude of the maximum noise and improves the signal to noise ratio.

Preferably, the touch control circuit is configured to detect each public power Extreme self-capacitance. As an example, the self-capacitance of the common electrode may be the capacitance to ground of the common electrode.

For each common electrode, the touch control circuit can drive the peripheral or remaining common electrodes according to a signal driving the current common electrode while driving the common electrode. In addition, the touch control circuit may further drive the data line according to a signal driving the current common electrode while driving the common electrode. This can reduce the voltage difference between the detected electrode and the non-detection electrode, and is advantageous for reducing the capacitance of the detected electrode and preventing false touches formed by water droplets.

Optionally, the touch control circuit includes a signal driving/receiving unit for driving each common electrode and receiving sensing data from each common electrode, and a signal processing unit for determining a touch position according to the sensing data. Specifically, the signal driving/receiving unit may be configured to drive, for each common electrode, a peripheral or remaining common electrode according to a signal driving the current common electrode while driving the common electrode. Furthermore, the signal driving/receiving unit may be further configured to, for each common electrode, drive the data line according to a signal driving the current common electrode while driving the common electrode.

Preferably, the touch control circuit is configured to determine a touch location based on a two-dimensional array of capacitance changes.

In addition, the common electrodes can be driven simultaneously or in groups. That is, all or part of the common electrodes are detected together.

In the prior art, since the touch sensing electrode is composed of a row electrode and a column electrode, a scanning method of one line after another is adopted, and the touch of each frame is used. The detection time is very long. This disadvantage is particularly detrimental to in-cell touch screens. In order to reduce the interaction between the display screen and the touch screen, the touch screen stops working when the screen is working; when the touch screen is working, the display screen stops working. For example, an In-Cell screen operating at 60 Hz (ie, 16.7 ms per frame) typically requires a display scan time of 10-12 ms, leaving a scan time for touch detection that is short, so the existing In-Cell screen signal noise is relatively low. . In the touch display device provided by the embodiment of the present disclosure, each electrode is connected to the touch detection chip. By parallel scanning, in theory, only the time of one line is detected by the prior art, and the original signal to noise ratio can be achieved. . For example, a 16-row, 28-column In-Cell touch screen assumes that the detection time per line is T, and the scan time required for the existing structure is 16T. With the structure provided by the embodiment of the present disclosure, the shortest touch detection time per frame is only 1T.

The display touch control circuit can be configured to perform a first step of looping, the first step comprising: the display control circuit scanning a frame, and then the touch control circuit scanning one frame. That is, one frame of display scanning is performed first, and then one frame of touch detection scanning is performed, and thus repeated.

Alternatively, the display touch control circuit is configured to perform a second step of looping, the second step comprising: the touch control circuit scanning one frame, and then the display control circuit scanning one frame. That is, one frame of touch detection scanning is performed first, and then one frame of display scanning is performed, and thus repeated.

Further, the display scan of each frame can be divided into multiple segments, and each segment performs a touch detection scan, so that the touch detection frequency reaches a multiple of the display frequency, thereby improving the frame rate of the touch detection. That is, the said Each frame scan segment of the display control circuit is performed; the touch control circuit performs a frame scan before, during, and after each frame scan of the display control circuit.

Embodiment 2

2a is a schematic side view of an example of a touch display device according to a second embodiment of the present disclosure.

As shown in FIG. 2a, the touch display device includes a first substrate 21, a second substrate 23, a liquid crystal layer 25 sandwiched between the two substrates, a common electrode layer 27, a thin film transistor layer, and a color filter (CF) layer. . The common electrode layer is placed on the same side of the thin film transistor layer with respect to the liquid crystal layer. Optionally, the touch display device further includes a second polarizing layer, a first polarizing layer, and a protective layer (COVER LENS). As an example, the touch display device has an IPS structure. The touch display device in this embodiment may also have an FFS structure.

A plurality of primitive cells are formed on the thin film transistor layer.

A plurality of common electrodes are formed on the common electrode layer, and the plurality of common electrodes are arranged in a two-dimensional array, such as a rectangular array. 2b shows a plan view of one example of a common electrode layer in accordance with Embodiment 2 of the present disclosure.

The touch display device also includes a display touch control circuit. The display touch control circuit includes a display control circuit and a touch control circuit, and the display touch control circuit and the plurality of common electrodes are connected by wires in a manner that, during the display phase, the plurality of common electrodes are connected to the supply The display control circuit has a common level; in the touch sensing phase, each of the plurality of common electrodes is respectively connected to the touch control circuit as a touch sensing electrode.

As shown in FIG. 2b, as an example, the common electrode layer includes a plurality of common electrodes (touch sensing electrodes) 1101-1120. As an example, FIG. 2b also shows a flexible circuit board (FPC) 24, a display touch control circuit 29, and a host. In this example, the touch display device can be connected to the host through a flexible circuit board. Preferably, the material of the common electrode is a metal oxide such as indium tin oxide (ITO) or graphene.

The shape of the common electrode may be square, rectangular, elongated, diamond or any other polygon, or may be triangular, circular or elliptical. Furthermore, the common electrode may have serrations on its edges. The patterns of the common electrodes may be uniform or inconsistent. As an example, in Fig. 2b, the shape of each common electrode is a square (for example, 5 mm in length and width) arranged in a rectangular array.

In the present embodiment, the wires 501 to 520 that connect the common electrodes 1101-1120 to the display touch control circuit are disposed on the common electrode layer. For example, the common electrode layer has a first side 101 and a second side 102, and the wire 501 connecting the common electrode 1101 extends in the common electrode layer in the direction Y to the first side 101, and the wire 502 connecting the common electrode 1102 is in common The electrode layer extends in the direction Y to the first side 101, and so on. The design of the wires 501-520 disposed on the common electrode layer is simple and cost-effective.

FIG. 3 shows an example of a wire wiring according to Embodiment 2 of the present disclosure.

The material of the wires 501-520 may be a metal oxide such as indium tin oxide (ITO) or graphene, or a metal. Preferably, the wires 501-520 are arranged on the same layer of the common electrode and are located in the black matrix (Black Matix) Just below. Arranging the wires under the black matrix avoids traces of indium tin oxide etching and possible reflection of the metal wires.

Preferably, the display touch control circuit wafer 29 of FIG. 2b is bonded to the substrate by a Chip-on-Glass (COG) method. For a screen of 5 turns, for example, assuming that each common electrode (including the corresponding trace) occupies 5 mm x 5 mm, 264 common electrodes are required, and the display touch control circuit chip 29 using a conventional package requires at least 264 pins. It can only be surface mounted on a printed circuit board, and the required flexible circuit board 24 is very wide, so the yield is low and the cost is high. By the COG method, the display touch control circuit chip 29 is directly bonded to the substrate, which can improve the yield and reduce the packaging cost, and also reduce the overall volume of the touch display device.

Optionally, the display touch control circuit chip 29 is connected to the host through the flexible circuit board 24. The host communicates with the display touch control circuit chip 29 via a flexible circuit board.

In general, the amount of capacitance change of the touch sensing electrode when the touch occurs is proportional to the area covered by the electrode, and therefore, the amount of capacitance change of each touch sensing electrode reflects the size of the covered area. As an example, a center of gravity algorithm can be employed to determine the touch location based on a two-dimensional array of capacitance changes.

The display touch control circuit chip 29 may be a single wafer integrated with a display control circuit and a touch control circuit. Alternatively, display touch control circuit die 29 may include two or more wafers, and display control circuitry and touch control circuitry are provided by different wafers.

Preferably, in the touch display device of the embodiment of the present disclosure, the source of each of the thin film transistors is provided with a driving circuit that drives the thin film transistor through a data line. In this way, the electric field distribution in the liquid crystal layer can be changed by adjusting the source voltage of the thin film transistor, so as to reduce the self-capacitance of the electrode and improve the sensitivity of the touch.

Embodiment 3

The touch display device according to the present embodiment also has an IPS structure or an FFS structure. The difference between this embodiment and the second embodiment lies in the position of the wire wiring. 4 shows an example of a wire wiring according to Embodiment 3 of the present disclosure, the wires 501-503 being arranged in another layer for the common electrode. Specifically, the wires are arranged in the same layer of the electrode of the primitive, and the wires can be respectively connected to the common electrodes through the through holes.

The material of the wires 501-503 may be a metal oxide such as indium tin oxide (ITO) or graphene, or a metal. Preferably, the wires 501-503 are arranged directly below the black matrix. Arranging the wires under the black matrix avoids traces of indium tin oxide etching and possible reflection of the metal wires.

For the description of other parts of this embodiment, refer to the second embodiment, which is not repeated here.

Embodiment 4

The difference between this embodiment and the third embodiment lies in the position of the wire wiring. FIG. 5 shows an example of a wire wiring according to Embodiment 4 of the present disclosure, the wires 501-503 being arranged in another layer for the common electrode. Specifically, the wires are arranged in a single layer, and the wires can be connected to the respective common electrodes through the through holes.

For the description of other parts of this embodiment, refer to the third embodiment, which is not repeated here.

Embodiment 5

The difference between this embodiment and the fourth embodiment lies in the position of the wire wiring. 6a and 6b show an example of a wire wiring according to Embodiment 5 of the present disclosure, the wires 501-503 being arranged in another layer for the common electrode. Specifically, the wires are arranged in the same layer of the data line, the data line layer shown in Fig. 6a is located under the TFT array, and the data line layer shown in Fig. 6b is located above the TFT array. The wires may be respectively connected to the common electrodes through the through holes.

For the description of other parts of this embodiment, refer to Embodiment 4, which is not repeated here.

Embodiment 6

FIG. 7 is a schematic side view of a touch display device according to Embodiment 6 of the present disclosure. As shown in FIG. 7, the touch display device includes a first substrate 61, a second substrate 63, a liquid crystal layer 65 sandwiched between the two substrates, a common electrode layer 67, a thin film transistor layer, and a color filter layer. The common electrode layer is placed on the same side of the color filter layer as the liquid crystal layer. Optionally, the touch display device further includes a second polarizing layer, a first polarizing layer, and a protective layer (COVER LENS). As an example, the touch display device has a TN structure.

A plurality of primitive cells are formed on the thin film transistor layer. A plurality of common electrodes are formed on the common electrode layer, and the plurality of common electrodes are arranged in a two-dimensional array.

The touch display device also includes a display touch control circuit. The display touch control circuit includes a display control circuit and a touch control circuit. The display touch control circuit and the plurality of common electrodes are connected by wires in a manner that the plurality of common electrodes are connected to a common level provided to the display control circuit during a display phase; Each of the plurality of common electrodes is connected to the touch control circuit as a touch sensing electrode, respectively.

The touch control circuit chip can be bonded to the substrate by COG.

The plan view of the common electrode layer of the present embodiment may be the same as or similar to that of the second embodiment. As shown in FIG. 2b, the common electrode layer includes a plurality of common electrodes (touch sensing electrodes).

FIG. 8 shows an example of a wire wiring according to Embodiment 6 of the present disclosure.

In the present embodiment, the wires 501 to 520 that connect the common electrodes 1101-1120 to the display touch control circuit are disposed on the common electrode layer. For example, the common electrode layer has a first side 101 and a second side 102, and the wire 501 connecting the common electrode 1101 extends in the common electrode layer in the direction Y to the first side 101, and the wire 502 connecting the common electrode 1102 is in common The electrode layer extends in the direction Y to the first side 101, and so on.

For the description of other parts of this embodiment, refer to the second embodiment, which is not repeated here.

Example 7

The touch display device according to the present embodiment also has a TN structure. The difference between this embodiment and the sixth embodiment lies in the position of the wire wiring. FIG. 9 shows an example of a wire wiring according to Embodiment 7 of the present disclosure, a wire 501-503 are arranged in another layer for the common electrode. Specifically, the wires are arranged in a single layer, and the wires can be connected to the respective common electrodes through the through holes.

For a description of other parts of this embodiment, refer to Embodiment 6, which is not repeated here.

Example eight

FIG. 10a illustrates a touch display device according to an eighth embodiment of the present disclosure. The difference between this embodiment and the foregoing embodiment is that the display touch wafer includes two or more wafers, and each of the wafers is used to control a corresponding portion of the display touch screen.

As an example, the common electrode layer is divided into a plurality of sub-regions, each of which includes a plurality of common electrodes arranged in a two-dimensional array, each connected to a display touch control wafer.

Each display touch wafer can be clock synchronized. Alternatively, each display touch wafer can work in a time-sharing manner.

As shown in FIG. 10a, the common electrode layer includes a plurality of sub-regions 301-306, each of which includes a plurality of common electrodes. The shape of the common electrode is a square, a diamond or other polygon, or a triangle, a circle or an ellipse. Furthermore, the common electrode may have serrations on its edges. For each sub-area, the pattern of the common electrodes may be uniform or inconsistent. Preferably, the material of the common electrode is a metal oxide such as indium tin oxide (ITO) or graphene, or a conductive material such as metal.

For each sub-area, each common electrode is connected by wires to one of its corresponding display touch wafers 1-6. The display touch wafer 1-6 can be bound to the first substrate or the second substrate by COG.

The display touch wafer 1-6 can be connected to the communication bus connection terminal by the communication bus bar 700, and the communication bus connection terminal can be connected to the host via the flexible circuit board 13. Preferably, the communication bus bar 700 is disposed in a non-transmissive region outside the sensing region, and may be a metal oxide such as an indium tin oxide (ITO) wire or a graphene wire, or may be a metal wire.

FIG. 10b illustrates another touch display device according to Embodiment 7 of the present disclosure. The difference between this embodiment and the embodiment of FIG. 10a is that the drive sensing module includes two or more wafers, each of which The wafer is used to control a corresponding partial area of the display touch screen.

As an example, the common electrode layer is divided into a plurality of sub-regions, each of which includes a plurality of common electrodes arranged in a two-dimensional array, each connected to a driving sensing module.

Each drive sensing module can be clock synchronized. Alternatively, each drive sensing module can work in a time-sharing manner.

As shown in FIG. 10b, the common electrode layer includes a plurality of sub-regions 301-306, each of which includes a plurality of common electrodes. The shape of the common electrode is a square, a diamond or other polygon, or a triangle, a circle or an ellipse. The common electrode may have serrations on its edges. For each sub-area, the pattern of the common electrodes may be uniform or inconsistent. Preferably, the material of the common electrode is a metal oxide such as indium tin oxide (ITO) or graphene.

For each sub-area, each common electrode is connected by wires to one of its corresponding drive sensing modules 1-6. The drive sensing module 1-6 can be bound to the substrate by COG.

The drive sensing module 1-6 can be connected to the data processing and communication module by the communication bus 700, and the data processing and communication module can be connected to the host via the flexible circuit board 13. Preferably, the communication bus bar 700 is disposed in a non-transmissive region outside the sensing region, and may be a metal oxide such as an indium tin oxide (ITO) wire or a graphene wire, or may be a metal wire.

This embodiment is particularly suitable for large size screens. The two or more display touch control wafers can simultaneously scan the touch panel to provide a better image capture rate.

The embodiments in the specification are mainly described as differences between the other embodiments, and the same or similar parts between the embodiments may be referred to each other.

The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments are obvious to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of the invention. Therefore, the present invention should not be limited to the disclosed embodiments, but the broadest scope consistent with the principles and novel features disclosed herein.

11‧‧‧First substrate

13‧‧‧second substrate

12‧‧‧Color filter layer

15‧‧‧Liquid layer

17‧‧‧Common electrode

18‧‧‧pixel electrode

19‧‧‧Thin Film Transistors

Claims (20)

A touch display device includes: a display touch screen, the display touch screen includes a first substrate, a second substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and a display unit, the display touch screen further comprising a plurality of common electrodes arranged in a two-dimensional array; and a display touch control circuit comprising a display control circuit and a touch control a circuit, the display touch control circuit and the plurality of common electrodes are connected by wires in a manner that, during a display phase, the plurality of common electrodes are connected to a common level provided to the display control circuit; during a touch sensing phase Each of the plurality of common electrodes is connected to the touch control circuit as a touch sensing electrode, respectively. The touch display device of claim 1, wherein the wires are disposed in a same layer of the plurality of common electrodes; or the wires are disposed on different layers of the plurality of common electrodes, through the through holes and the plurality of A common electrode connection. The touch display device of claim 1, wherein the wires are disposed in a same layer of the data line and connected to the plurality of common electrodes through the through holes. The touch display device of claim 1, wherein the primitive unit comprises a primitive electrode, and the wire is disposed on a same layer of the primitive electrode, and is connected to the plurality of common electrodes through a through hole. The touch display device according to claim 1, wherein the wires are disposed directly under the black matrix. The touch display device of claim 1, wherein the display touch control circuit is a single chip integrated with the display control circuit and the touch control circuit; or the display touch control circuit comprises two or two In the above wafer, the display control circuit and the touch control circuit are provided by different wafers; or the display touch control circuit includes two or more wafers, each of which is used to control the display touch screen A corresponding part of the area. The touch display device of claim 6, wherein the display touch control circuit chip is bonded to the first substrate or the second substrate in a chip-on-glass manner; or the display control The circuit chip and the touch control circuit wafer are bonded to the first substrate or the second substrate in a chip-on-glass manner. The touch display device of claim 1, wherein the touch control circuit is configured to detect a self-capacitance of each common electrode. The touch display device of claim 8, wherein the touch control circuit is configured to detect a self-capacitance of each common electrode by simultaneously driving a common periphery of the common electrode according to a signal applied to the common electrode An electrode; or driving the remaining public power according to a signal applied to the common electrode pole. The touch display device of claim 9, wherein the touch control circuit is configured to simultaneously drive the data line according to a signal applied to the common electrode. The touch display device of claim 8, wherein the touch control circuit is configured to determine a touch position according to the two-dimensional array of capacitance changes. The touch display device of claim 1, wherein the display touch screen has an In-Plane Switching structure or a Fringe Field Switching structure or a Twisted Nematic structure. The touch display device according to claim 1, wherein the shape of the common electrode is a regular polygon; or the shape of the common electrode is an elongated shape; or the shape of the common electrode is a circle; or the common electrode The shape is oval. The touch display device of claim 1, wherein the common electrode has serrations on an edge thereof. The touch display device of claim 1, wherein the material of the plurality of common electrodes is indium tin oxide (ITO) or graphene. The touch display device of claim 1, wherein each of the picture element units of the display touch screen comprises a thin film transistor (TFT), and a source of each of the thin film transistors is provided with a driving circuit, the driving circuit The thin film transistor is driven by a data line. The touch display device of claim 1, the touch display device A plurality of touch control circuits are included, each touch control circuit connecting a corresponding one of the plurality of common electrodes. The touch display device of claim 17, wherein the clocks of the touch control circuits are synchronized; or the touch control circuits operate in a time-sharing manner. The touch display device of claim 1, wherein the display touch control circuit is configured to perform a first step of looping, the first step comprising: the display control circuit scanning one frame, and then the touch control circuit scanning One frame; or the display touch control circuit is configured to perform a second step in a loop, the second step comprising: the touch control circuit scanning one frame, and then the display control circuit scanning one frame. The touch display device of claim 1, wherein the display touch control circuit is configured to: each frame scan segment of the display control circuit is performed; or before each frame scan of the display control circuit, Thereafter, the touch control circuit performs a frame scan.