TWI502456B - Mutual capacitance touch screen and touch-sensitive method - Google Patents

Description

Mutual capacitive touch screen and touch sensing method thereof

The invention belongs to the field of touch screen technology, and particularly relates to a mutual capacitive touch screen and a touch sensing method thereof.

With the development of technology, handwriting input technology has become more and more important. At present, in the electronic terminal, the mutual capacitive touch screen is commonly used to realize the touch sensing of handwriting input.

The mutual capacitive touch screen includes a driving electrode and a receiving electrode, and the driving electrode is configured to emit a low voltage high frequency signal and project to the receiving electrode to form a stable current. When the human body or the stylus touches the touch screen, an equivalent capacitance is formed between the fingertip or the tip of the pen and the touch screen, and the high frequency signal can enter the ground by the equivalent capacitance, and the receiving electrode receives the The amount of charge is reduced, and the position of the touch point can be confirmed by the intensity of the current on the receiving electrode.

Since the tip diameter of the stylus is generally smaller than the fingertip, the spacing between the receiving electrodes is relatively small when the pen tip is input, for the following reasons: as shown in Fig. 1a, R is the receiving electrode, and T is the driving. Electrode, point A is the touch point, the X axis represents the noise value, and the Y axis represents the current intensity value (ie, the sensing value) on the receiving electrode. If the spacing between the receiving electrodes maintains the current larger value, then the tip of the pen When moving from left to right, since the diameter of the nib is small, when the nib is at the middle position A of the two receiving electrodes, the sensing value is close to or coincides with the noise value, and the current position of the nib cannot be determined; for this, as in 1b As shown in the figure, the spacing between the receiving electrodes can be reduced. When the nib is at the middle position A of the two receiving electrodes, although the sensing value is decreased, it is still higher than the noise value, so the nib can be detected. Touch the point location.

Therefore, in order to accurately detect the touch points of various types of touching objects, the conventional mutual capacitive touch screen often fixes the spacing between the receiving electrodes to be small, which helps to detect small touches such as a stylus. Touching the input of an object, but the input to a large touch object such as a finger is not significant. On the contrary, because of the small pitch and the large number of sensing channels, the overall scanning time is increased, and more system resources are wasted; The increase in scan time means that the report rate is slow, the system response is insensitive, and the user experience is poor.

The purpose of the embodiments of the present invention is to provide a mutual-capacitive touch screen, which aims to solve the scanning time of the conventional mutual-capacitive touch screen due to the small spacing between the receiving electrodes. The problem of lengthening, wasting system resources, and making the system insensitive, and user experience is poor.

The embodiment of the present invention is implemented as follows: a mutual capacitive touch screen includes a plurality of driving electrodes and a plurality of receiving electrodes, and the mutual capacitive touch screen further comprises:

a plurality of first switches, wherein the plurality of first switches are respectively connected in series to the lead lines of the respective receiving electrodes;

a plurality of second switches, wherein the plurality of second switches are respectively connected in one-to-one correspondence between the leading ends of the adjacent receiving electrodes;

a control unit, the control unit is connected to the output end of each receiving electrode, the first switch and the second switch, for identifying the type of the touch object, and according to the recognition result, controlling the closing of the first switch and the second switch or Disconnected to dynamically adjust the width and spacing of the sensing channel of the receiving electrode, and then position detection of the touch point of the touching object.

Another object of the present invention is to provide a touch sensing method for a mutual capacitive touch screen as described above, the method comprising:

The control unit identifies the type of the touch object, and controls the closing or opening of the corresponding first switch and the second switch according to the recognition result to dynamically adjust the width and spacing of the sensing channels of each receiving electrode;

The control unit performs position detection on the touch point of the touch object.

The mutual capacitive touch screen and the touch sensing method thereof provided by the invention first use the control unit to identify the type of the touch object, and then realize the dynamic by controlling the opening and closing of the corresponding first switch and the second switch by the control unit. Adjusting the width, spacing and width of the sensing channels of each receiving electrode, the width and spacing of the sensing channels can be increased for larger touching objects such as fingers, and the sensing channel width can be reduced for smaller touching objects such as styluses. And the spacing, so that the input of each type of touching object can be accurately detected, and the number of sensing channels can be reduced when the touching object is large, the overall scanning time is reduced, system resources are saved, the reporting speed is increased, and the system response is further caused. More sensitive and user-friendly.

11. . . First switch

12. . . Second switch

13. . . Third switch

14. . . Fourth switch

201, 205. . . Third insulating layer

202. . . Signal electrode

203. . . Thin film field effect transistor bungee

204, 25. . . Pixel electrode

206, 23. . . Y-direction common electrode

207, 211, 212. . . Second insulating layer

208, 22. . . X-direction common electrode

209. . . First insulating layer

twenty one. . . Signal electrode

210. . . glass substrate

213, 24. . . Switch electrode

214, 26. . . Thin film field effect transistor

R1 to Rm. . . Receiving electrode

S1, S101 to S104, S2, S201 to S208, S21 to S24, S31 to S34, S41 to S44. . . step

T1 to Tn. . . Drive electrode

FIG. 1a is a schematic diagram of detection of a mutual capacitive touch screen when the distance between the receiving electrodes is large;
FIG. 1b is a schematic diagram of the detection of the mutual capacitive touch screen when the distance between the receiving electrodes is small;
Figure 2 is a diagram showing the arrangement principle of the receiving electrode and the driving electrode in the first embodiment of the present invention;
FIG. 3 is a flowchart of a touch sensing method of a mutual capacitive touch screen according to Embodiment 2 of the present invention; FIG.
4 is a flow chart of dynamically adjusting the scanning pitch of the sensing electrodes in the second embodiment of the present invention;
Figure 5 is a flow chart showing the type of the touch object recognized by the control unit in the second embodiment of the present invention;
Figure 6a is a schematic view of a report area when the object is touched by a finger in the second embodiment of the present invention;
6b is a schematic diagram of a report area when the touch object is a stylus in the second embodiment of the present invention;
Figure 7 is another flow chart of the control unit identifying the type of the touch object in the second embodiment of the present invention;
FIG. 8 is another flow chart of dynamically adjusting the scanning pitch of the sensing electrodes in the second embodiment of the present invention; FIG.
9 is a schematic diagram of electrode arrangement of a thin film field effect transistor liquid crystal display according to Embodiment 3 of the present invention;
FIG. 10 is a schematic diagram of an electrode stack structure of a thin film field effect transistor liquid crystal display device according to Embodiment 3 of the present invention; FIG.
Figure 11 is a flow chart showing the position detection of the touch point of the touch object by the control unit in the fourth embodiment of the present invention.

In order to make the objects, the technical means and the advantages of the present invention more comprehensible, the present invention will be further described in detail below with reference to the drawings and embodiments. It is understood that the embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In view of the problems existing in the conventional mutual capacitive touch screen, the mutual capacitive touch screen proposed by the present invention first recognizes the type of the touch object, and then controls the opening and closing of the corresponding first switch and the second switch. The purpose of dynamically adjusting the width and spacing of the sensing channels of each receiving electrode is achieved. The technical means of the present invention will be described in detail below with reference to the embodiments:

Embodiment 1

A first embodiment of the present invention provides a mutual capacitive touch screen, as shown in FIG. 2, including a plurality of spaced-apart drive electrodes T1 to Tn, and a plurality of spaced-apart receiving electrodes R1 to Rm, and plural The strip drive electrode intersects the plurality of receive electrodes perpendicularly. Different from the prior art, the mutual capacitive touch screen further includes: a plurality of first switches 11 , wherein the plurality of first switches 11 are respectively connected in series to the lead lines of the receiving electrodes; and the plurality of second switches 12 a plurality of second switches 12 are respectively connected in one-to-one correspondence between the terminals of the adjacent receiving electrodes; a control unit (not shown), the control unit is connected to the leading ends of the receiving electrodes, the first switch 11 and the The second switch 12 is configured to identify the type of the touch object, and according to the recognition result, control the closing or opening of the corresponding first switch 11 and the second switch 12 to dynamically adjust the width and spacing of the sensing channels of each receiving electrode, and then Touch the touch point of the object to perform position detection.

Further, the mutual capacitive touch screen may further include: a plurality of third switches 13 respectively, wherein the plurality of third switches 13 are respectively connected in series to the lead lines of the driving electrodes; the plurality of fourth switches 14 and the plurality of The four switches 14 are respectively connected in one-to-one correspondence between the leading ends of the adjacent receiving electrodes. At this time, the control unit is further configured to identify the type of the touch object, and according to the recognition result, control the closing or opening of the corresponding third switch 13 and the fourth switch 14 to dynamically adjust the width and spacing of the sensing channels of the driving electrodes. Then, the position detection of the touch point of the touch object is performed.

The mutual capacitive touch screen proposed in the first embodiment of the present invention first uses the control unit to identify the type of the touch object, and then dynamically controls the opening and closing control of the corresponding first switch 11 and the second switch 12 by the control unit. The purpose of the width, spacing and width of the sensing channels of the receiving electrodes is to increase the width and spacing of the sensing channels for larger touching objects such as fingers, and to reduce the width of the sensing channels for smaller touching objects such as stylus pens. The spacing can not only accurately detect the input of each type of touching object, but also reduce the number of sensing channels when the touching object is large, reduce the overall scanning time, save system resources, improve the reporting speed, and thus make the system more responsive. Sensitive and user-friendly.

Embodiment 2

The second embodiment of the present invention provides a touch sensing method for a mutual capacitive touch screen according to the first embodiment, as shown in FIG. 3, including:

Step S1: The control unit identifies the type of the touch object, and according to the recognition result, controls the closing or opening of the corresponding first switch 11 and the second switch 12 to dynamically adjust the sensing channel width and spacing of each receiving electrode.

In one case, as shown in FIG. 4, step S1 may include:

Step S101: The control unit detects a touch action of touching the object according to the current signal of the receiving electrode.

Step S102: The control unit identifies the type of the touch object, and the type is classified according to the contact area when the touch object contacts the touch screen. If the touch object is a finger, step S103 is performed, if the touch object is If the finger and the stylus or the touch object are the stylus, step S104 is performed.

Further, in one case, the size of the area of the report area is used to distinguish that the touch object is a finger or a stylus. In this case, as shown in FIG. 5, step S102 may specifically include:

Step S31: The control unit obtains an area of at least one report area according to the current signal of the receiving electrode.

Step S32: If the area of each report area is greater than the first threshold value, the control unit identifies that the touch object is a finger.

Step S33: If the area of each report area is less than or equal to the first threshold value, the control unit identifies that the touch object is a stylus.

Step S34: If the area of a part of the report area is greater than the first threshold and the area of the other part of the report area is respectively less than or equal to the first threshold, the control unit identifies that the touch object is a stylus and a finger.

For example, as shown in FIG. 6a and FIG. 6b, the control unit can recognize that the report area B is a report area when the finger touches, and the report area C is a report when the touch pen is touched. Point area.

Further, in another case, the peak value of the current signal corresponding to the report area or the degree of inclination of the curve portion near the peak point distinguishes the touch object as a finger or a stylus. At this time, as shown in FIG. 7, Step S102 may specifically include:

Step S41: The control unit obtains at least one report area according to the current signal of the receiving electrode.

Step S42: If the peak value of the current signal corresponding to each reporting area satisfies the first range value, or the slope between the peak point of the current signal of each reporting area and the neighboring point of the peak point is less than the preset slope value, the control unit Identifying a touch object is a finger. The neighboring point of the peak point may be the first point, the second point or the nth (n is a positive integer) point adjacent to the peak point, and the value of n is set by the manufacturer according to actual needs.

Step S43: If the peak value of the current signal corresponding to each report area satisfies the second range value, or the slope between the peak point of the current signal of each report area and the neighbor point of the peak point is greater than or equal to the preset slope value, then The control unit recognizes that the touch object is a stylus. The upper limit value of the first range value is higher than the lower limit value of the second range value.

Step S44: If the peak value of the current signal corresponding to a part of the report area satisfies the first range value or the slope between the peak point of the current signal of each report area and the neighbor point of the peak point is less than the preset slope value, and another part is reported If the peak value of the current signal corresponding to the dot area satisfies the second range value or the slope between the peak point of the current signal of each reporting area and the neighboring point of the peak point is greater than or equal to the preset slope value, the control unit identifies that the touch object is Stylus and fingers.

Step S103: If the touching object is a finger, the control unit controls closing or opening of the corresponding first switch 11 and the second switch 12 to increase the sensing channel width and spacing of each receiving electrode.

Step S104: If the touch object is a finger and a stylus, or the touch object is a stylus, the control unit controls closing or opening of the corresponding first switch 11 and the second switch 12 to reduce the receiving electrodes. Induction channel width and spacing.

In another case, as shown in FIG. 8, step S1 may include:

Step S201: The control unit detects a touch action of touching the object according to the current signal of the receiving electrode.

Step S202: The control unit identifies the type of the touch object. If the touch object is a finger, step S203 is performed. If the touch object is a finger and a stylus, or the touch object is a stylus, step S205 is performed. If the touch object is a stylus, step S207 is performed. The detailed process of step S202 is as shown in FIG. 5 or 7, and details are not described herein.

Step S203: If the touch object is a finger, it is determined whether it is necessary to reduce the sensing channel width and the spacing of each receiving electrode. If yes, step S206 is performed; otherwise, step S204 is performed.

Step S204: maintaining the width and spacing of the sensing channels of the respective receiving electrodes.

Step S205: If the touch object is a finger and a stylus, or the touch object is a stylus, the control unit controls closing or opening of the corresponding first switch 11 and the second switch 12 to reduce the receiving electrodes. Induction channel width and spacing.

Step S206: The control unit controls the closing or opening of the respective first switch 11 and the second switch 12 to reduce the width and spacing of the sensing channels of the respective receiving electrodes.

Step S207: If the touch object is a stylus, it is determined whether it is necessary to reduce the width and spacing of the sensing channels of each receiving electrode. If yes, step S206 is performed; otherwise, step S208 is performed.

Step S208: The control unit controls the closing or opening of the respective first switch 11 and the second switch 12 to increase the width and spacing of the sensing channels of the respective receiving electrodes.

Step S2: The control unit performs position detection on the touch point of the touch object.

In the second embodiment of the present invention, if the mutual capacitive touch screen further includes the third switch 13 and the fourth switch 14, the control process of the control unit for the corresponding third switch 13 and the fourth switch 14 is as described above in steps S1 and S2. As described, it will not be described here.

The touch sensing method of the mutual capacitive touch screen provided by the second embodiment of the present invention first identifies the type of the touch object, and then dynamically adjusts the opening and closing control of the corresponding first switch 11 and the second switch 12 The purpose of the width, spacing and width of the sensing channels of the receiving electrodes is to increase the width and spacing of the sensing channels for larger touching objects such as fingers, and to reduce the width of the sensing channels for smaller touching objects such as stylus pens. The spacing can not only accurately detect the input of each type of touching object, but also reduce the number of sensing channels when the touching object is large, reduce the overall scanning time, save system resources, improve the reporting speed, and thus make the system more responsive. Sensitive and user-friendly.

Embodiment 3

Embodiment 3 of the present invention provides a thin film field effect transistor liquid crystal display, which is a thin film field effect transistor liquid crystal display based on In-Plane Switching (IPS) technology, and the electrode arrangement thereof The principle is as shown in Fig. 9, and the principle of electrode stacking is as shown in Fig. 10.

In detail, as shown in FIG. 9, the thin film field effect transistor liquid crystal display includes: an X-direction common electrode 22; a signal electrode 21 and a Y-direction common electrode 23 respectively intersecting the X-direction common electrode 22 and vertically arranged, And the signal electrode 21 and the Y-direction common electrode 23 do not intersect each other; the switch electrode 24 intersecting and vertically arranged with the signal electrode 21 and the Y-direction common electrode 23, and the X-direction common electrode 22 and the switch electrode 24 do not intersect each other; In the X direction common electrode 22, the signal electrode 21, the Y direction common electrode 23, and the switch electrode 24, the pixel electrode 25 in the enclosed area, and a part of the pixel electrode 25 overlaps with the switch electrode 24; the signal electrode 21 and the pixel are connected Thin film field effect transistor 26 of electrode 25.

As shown in FIG. 10, 201 is a third insulating layer; 202 is a signal electrode; 203 is a thin film field effect transistor delta; 204 is a pixel electrode; 205 is a third insulating layer; and 206 is a Y-direction common electrode. 207 is a second insulating layer; 208 is a common electrode in the X direction; 209 is a first insulating layer; 210 is a glass substrate; 211 is a second insulating layer; 212 is a second insulating layer; 213 is a switching electrode; Effect transistor.

The thin film field effect transistor liquid crystal display is manufactured by first vacuum-sputtering molybdenum aluminum crucible on a glass plate and lithographically patterning the electrode; and then forming a first insulating layer by plasma enhanced chemical vapor deposition. Thereafter, the lithographic pattern is formed by vacuum sputtering of the ITO, and the X-direction common electrode is formed; thereafter, the thin film field-effect transistor is formed by plasma-enhanced chemical vapor deposition, and the lithography pattern; thereafter, plasma-enhanced chemistry Vapor deposition to form a second insulating layer, a lithographic pattern; thereafter, vacuum sputtering of molybdenum aluminum ruthenium, lithographic patterning to form signal electrodes and thin film field effect transistor delta; followed by plasma enhanced chemical vapor deposition A third insulating layer is formed, and a lithographic pattern is formed; thereafter, ITO is vacuum-sputtered, and the lithographic pattern forms a Y-direction common electrode and a pixel electrode.

The display principle of the thin film field effect transistor liquid crystal display is that when the switch electrode 24 is turned off, the thin film field effect transistor 26 is connected to two opposite diodes, and the current of the signal electrode 21 cannot be passed through the thin film. The field effect transistor 26 flows to the drain of the thin film field effect transistor 26, and since the pixel electrode 25 is connected to the thin film field effect transistor 26, no current flows to the pixel electrode, and the pixel electrode 25 and the X direction are present. An electric field cannot be established between the common electrode 22 and the Y-direction common electrode 23. When the switch electrode 24 is turned on, the current of the signal electrode 21 flows through the thin film field effect transistor 26 to the drain of the thin film field effect transistor 26, at which time the pixel electrode 25 and the X-direction common electrode 22 and the Y-direction common electrode 23 When an electric field is established, the liquid crystal molecules rotate under the action of an electric field to complete the display function.

Different from the prior art, in the third embodiment of the present invention, at least one X-direction common electrode 22 constitutes a driving electrode, and at least one signal electrode 21 constitutes a receiving electrode; or at least one X-direction common electrode 22 constitutes a receiving electrode and at least one signal. The electrode 21 constitutes a driving electrode; or at least one X-direction common electrode 22 constitutes a driving electrode, and at least one Y-direction common electrode 23 constitutes a receiving electrode; or at least one X-direction common electrode 22 constitutes a receiving electrode, and at least one Y-direction common electrode 23 constitutes a driving electrode. The receiving electrode is the receiving electrode described in the first embodiment, and the driving electrode is the driving electrode described in the first embodiment, and details are not described herein.

It can be seen that the third embodiment of the present invention applies the first embodiment to the thin film field effect transistor liquid crystal display of the IPS technology, which can significantly improve the performance of the conventional thin film field effect transistor liquid crystal display and enhance the ease of use.

Embodiment 4

The fourth embodiment of the present invention provides a touch sensing method for a thin film field effect transistor liquid crystal display device according to the third embodiment, and the specific steps are the same as those of the second embodiment of the present invention, and are not described herein.

Further, in the fourth embodiment of the present invention, the control unit includes a touch wafer and a host processor. Generally, in a thin film field effect transistor liquid crystal display with a touch function, the touch sensing data is processed by the touch wafer, but for a small touch object, the sensing channel needs to be scanned at a small pitch. The amount of data of the touch sensing data to be processed is increased in a geometrical manner, which may cause the processing data of the touch wafer to be blocked. In order to solve the problem, the fourth embodiment of the present invention can perform the touch when appropriate in the step S2. The sensing data is directly processed by the host processor to reduce the processing pressure of the touch wafer and improve the data processing speed. In detail, at this time, as shown in FIG. 11, step S2 includes:

Step S21: The touch chip collects the current signal of the receiving electrode. If the sensing channel width and the spacing of each receiving electrode are increased in step S1, step S22 is performed. If the sensing channel width of each receiving electrode is reduced in step S1, For the pitch, step S23 is performed.

Step S22: If the width and spacing of the sensing channels of each receiving electrode are increased, the touch wafer uses the collected current signal to obtain the location data of the touch point, and reports the location data to the host processor.

Step S23: If the sensing channel width and spacing of each receiving electrode are reduced, the touch chip sends a current signal to the host processor.

Step S24: The host processor uses the current signal to obtain the location data of the touch point, and self-reports the location data.

The touch sensing method of the thin film field effect transistor liquid crystal display provided by the fourth embodiment of the present invention is to apply the second embodiment to the thin film field effect transistor liquid crystal display of the IPS technology, in addition to the beneficial effects of the second embodiment, Reasonably coordinate the touch chip or the host processor to process the sensing data, improve the system execution efficiency, and improve the data processing capability and processing speed.

Those skilled in the art will appreciate that all or part of the steps in implementing the above-described embodiments may be controlled by a program to control the associated hardware. The program may be stored in a computer readable storage medium. Storage medium, such as ROM/RAM, magnetic disk, optical disk, etc.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. Within the scope.

11. . . First switch

12. . . Second switch

13. . . Third switch

14. . . Fourth switch

R1 to Rm. . . Receiving electrode

T1 to Tn. . . Drive electrode

Claims (10)

A mutual capacitive touch screen includes a plurality of driving electrodes and a plurality of receiving electrodes, wherein the mutual capacitive touch screen further comprises:
a plurality of first switches, wherein the plurality of first switches are respectively connected in series to each of the receiving lines of the receiving electrodes;
a plurality of second switches, wherein the plurality of second switches are respectively connected in one-to-one correspondence between the leading ends of the adjacent receiving electrodes;
a control unit, the control unit is connected to the leading end of each of the receiving electrodes, the first switch and the second switch, for identifying the type of the touch object, and controlling the corresponding first switch and the second switch according to the recognition result The closing or opening is performed to dynamically adjust the width and spacing of the sensing channel of the receiving electrode, and then the position of the touch point of the touching object is detected. The mutual capacitive touch screen of claim 1, wherein the mutual capacitive touch screen further comprises:
a plurality of third switches, wherein the plurality of third switches are respectively connected in series to each of the driving lines of the driving electrodes;
a plurality of fourth switches, wherein the plurality of fourth switches are respectively connected in one-to-one correspondence between the leading ends of the adjacent receiving electrodes;
The control unit is further configured to control the closing or opening of the third switch and the fourth switch according to the recognition result to dynamically adjust the width and spacing of the sensing channels of each of the driving electrodes, and then touch the touching object. Touch the point for position detection. The mutual capacitive touch screen of claim 1 or 2, wherein the driving electrode is at least one X-direction common electrode in the thin film field effect transistor liquid crystal display, and the receiving electrode is the thin film field effect transistor At least one signal electrode in the liquid crystal display; or the driving electrode is the at least one signal electrode in the thin film field effect transistor liquid crystal display, the receiving electrode being the at least one X direction common in the thin film field effect transistor liquid crystal display Or the driving electrode is the at least one X-direction common electrode in the thin film field effect transistor liquid crystal display, the receiving electrode being at least one Y-direction common electrode in the thin film field effect transistor liquid crystal display; or the driving electrode The at least one Y-direction common electrode in the thin film field effect transistor liquid crystal display, the receiving electrode being the at least one X-direction common electrode in the thin film field effect transistor liquid crystal display. The mutual capacitive touch screen of claim 3, wherein the thin film field effect transistor liquid crystal display comprises:
The X-direction common electrode;
The signal electrode and the Y-direction common electrode respectively intersecting the X-direction common electrode and vertically arranged, and the signal electrode and the Y-direction common electrode do not intersect each other;
a switching electrode intersecting and vertically arranged with the signal electrode and the Y-direction common electrode, and the X-direction common electrode and the switching electrode do not intersect each other;
Arranging a pixel electrode in the X-direction common electrode, the signal electrode, the Y-direction common electrode, and the switch electrode surrounding area, and a portion of the pixel electrode overlaps the switch electrode;
A thin film field effect transistor connecting the signal electrode and the pixel electrode. A touch sensing method for a mutual capacitive touch screen as described in claim 1, wherein the method comprises:
The control unit identifies the type of the touch object, and controls the closing or opening of the corresponding first switch and the second switch according to the recognition result to dynamically adjust the width and spacing of the sensing channels of each receiving electrode;
The control unit performs position detection on the touch point of the touch object. The touch sensing method of the mutual capacitive touch screen according to claim 5, wherein the control unit identifies the type of the touch object, and controls the corresponding first switch and the second according to the recognition result. The steps of closing or opening the switch to dynamically adjust the width and spacing of the sensing channels of each of the receiving electrodes include:
The control unit detects a touch action of the touch object according to the current signal of the receiving electrode;
The control unit identifies the type of the touch object;
If the touch object is a finger, the control unit controls closing or opening of the corresponding first switch and the second switch to increase the width and spacing of the sensing channels of each of the receiving electrodes;
If the touch object is a finger and a stylus, or the touch object is a stylus, the control unit controls closing or opening of the corresponding first switch and the second switch to reduce each of the receiving electrodes Induction channel width and spacing. The touch sensing method of the mutual capacitive touch screen according to claim 5, wherein the control unit identifies the type of the touch object, and controls the corresponding first switch and the second according to the recognition result. The steps of closing or opening the switch to dynamically adjust the width and spacing of the sensing channels of each of the receiving electrodes include:
The control unit detects a touch action of the touch object according to the current signal of the receiving electrode;
The control unit identifies the type of the touch object;
If the touching object is a finger, determining whether it is necessary to reduce the width and spacing of the sensing channels of each of the receiving electrodes, wherein the control unit controls the closing or opening of the corresponding first switch and the second switch to reduce The width and spacing of the sensing channels of the receiving electrodes, otherwise maintaining the width and spacing of the sensing channels of the receiving electrodes;
If the touch object is a finger and a stylus, or the touch object is a stylus, the control unit controls closing or opening of the corresponding first switch and the second switch to reduce each of the receiving electrodes Induction channel width and spacing;
If the touch object is a stylus, it is determined whether it is necessary to reduce the width and spacing of the sensing channels of each of the receiving electrodes, and the control unit controls the closing or opening of the corresponding first switch and the second switch to The width and spacing of the sensing channels of each of the receiving electrodes are reduced. Otherwise, the control unit controls the closing or opening of the first switch and the second switch to increase the width and spacing of the sensing channels of the receiving electrodes. The touch sensing method of the mutual capacitive touch screen according to claim 6 or 7, wherein the step of the control unit identifying the type of the touch object comprises:
The control unit obtains an area of at least one report area according to the current signal of the receiving electrode;
If the area of each of the reporting areas is greater than the first threshold, the control unit identifies that the touching object is a finger;
If the area of each of the reporting areas is less than or equal to the first threshold, the control unit identifies that the touching object is a stylus;
If the area of a part of the report area is greater than the first threshold and the area of the other part of the report area is less than or equal to the first threshold, the control unit identifies that the touch object is a stylus and a finger. . The touch sensing method of the mutual capacitive touch screen according to claim 6 or 7, wherein the step of the control unit identifying the type of the touch object comprises:
The control unit obtains at least one report area according to the current signal of the receiving electrode;
If the peak value of the current signal corresponding to each report area satisfies the first range value, or the slope between the peak point of the current signal of each report area and the neighbor point of the peak point is less than a preset slope value, the control unit identifies the Touching an object is a finger;
If the peak value of the current signal corresponding to each reporting area satisfies the second range value, or the slope between the peak point of the current signal of each reporting area and the neighboring point of the peak point is greater than or equal to the preset slope value, the control unit Recognizing that the touch object is a stylus, an upper limit value of the first range value is higher than a lower limit value of the second range value;
If the peak value of the current signal corresponding to a part of the report area satisfies the first range value, or the slope between the peak point of the current signal of each report area and the neighbor point of the peak point is less than the preset slope value, and another part of the report point If the peak of the current signal corresponding to the region satisfies the second range value, or the slope between the peak point of the current signal of each reporting area and the neighboring point of the peak point is greater than or equal to the preset slope value, the control unit identifies the touch Touching objects is a stylus and a finger. The touch sensing method of the mutual capacitive touch screen described in claim 5, 6 or 7, wherein the driving electrode is at least one X-direction common electrode in the thin film field effect transistor liquid crystal display, the receiving electrode Is at least one signal electrode in the thin film field effect transistor liquid crystal display; or the driving electrode is the at least one signal electrode in the thin film field effect transistor liquid crystal display, and the receiving electrode is in the thin film field effect transistor liquid crystal display The at least one X-direction common electrode; or the driving electrode is the at least one X-direction common electrode in the thin film field effect transistor liquid crystal display, the receiving electrode being at least one Y direction in the thin film field effect transistor liquid crystal display a common electrode; or the driving electrode is the at least one Y-direction common electrode in the thin film field effect transistor liquid crystal display, the receiving electrode being the at least one X-direction common electrode in the thin film field effect transistor liquid crystal display; the control The unit includes a touch wafer in the thin film field effect transistor liquid crystal display and Processors, the control unit performs the step of detecting the position of the touch point of the touch object comprising:
The touch chip collects a current signal of the receiving electrode;
If the width and spacing of the sensing channels of the receiving electrodes are increased, the touch chip obtains the location data of the touch points by using the collected current signals, and reports the location data to the host processor;
If the width and spacing of the sensing channels of the receiving electrodes are reduced, the touch chip sends a current signal to the host processor, and then the host processor uses the current signal to obtain the location data of the touch point, and Report the location information.