TWI582669B - Touch display driver and driving method for improving image quality of in-cell touch display panel - Google Patents

Description

Touch display driver for improving picture quality of in-cell touch display panel and driving method thereof

The present invention relates to a touch display technology, and more particularly to a touch display driver capable of improving the picture quality of an in-cell touch display panel and a driving method thereof.

In general, an in-cell touch display panel integrates a touch component into a display panel, and implements a touch function and a display function through a time-division driving method. The time driving is to perform the screen display action and the touch sensing action in a frame period. However, in the general time-division driving method, when the touch sensing operation is performed and the screen display operation is temporarily interrupted, in each frame period, the time point at which the screen display operation is interrupted or the interrupt screen display operation corresponds to The position of the gate driving line of the in-cell touch display panel is fixed, so that the horizontal line visual effect problem is easily generated. For example, as shown in FIG. 1, the in-cell touch display panel 900 appears when the screen is displayed. A plurality of horizontal stripes 910.

For example, in each frame period (including the frame periods FP1, FP2, . . . , FPy) shown in FIG. 1, the in-cell touch display panel 900 can be sequentially driven in the screen display operation interval DP_A. The one to the nth gate driving lines G1 to Gn perform a screen display operation, and then the touch sensing operation of the in-cell touch display panel 900 can be performed in the touch sensing operation section TP_A, and then the screen display operation is performed. In the interval DP_B, the (n+1)th to the 2nth gate driving lines G(n+1)~G2n of the in-cell touch display panel 900 are sequentially driven to perform a screen display operation, and the touch sensing is continued. The action interval, and so on until the frame period is scanned, where n and y are positive integers. Since in each frame period (including the frame periods FP1, FP2, ..., FPy), the gate driving lines corresponding to the interruption of the screen display operation due to the touch sensing operation fall on the nth and its multiples. Gate driving lines Gn, G2n, ..., therefore, for example, the nth gate driving line Gn and the (n+1)th gate driving line G(n+1) on the pixel unit (by the sub The brightness of the pixel elements R, G, and B) is slightly different from that exhibited by the pixel elements on the remaining gate drive lines. And so on, the gate driving line of the (n multiple) strip and the gate driving line of the (n multiple +1) strip have the same situation, so that the touch display panel 900 can be observed. The phenomenon of multiple stripes 910.

In addition, in each frame period (including the frame period FP1, FP2, ..., FPy), when the in-cell touch display panel 900 is to enter the touch sensing interval TP_A for touch sensing operation In the case where the nth and its multiple gate drive lines Gn, G2n, ... interrupt the screen display operation, the nth and its multiple gate drive lines Gn, G2n, ... correspond to the in-cell touch display panel. Some of the transistor elements in the gate drive circuit (such as Gate driver on Array, GOA) are degraded by high voltage for a long time, which may cause the IV curve of the part of the transistor to shift. Leading to the visual line effect of the horizontal line, in severe cases, it is more likely to cause damage to the part of the transistor element. In particular, after the reliability test is performed on the in-cell touch display panel 900, the horizontal line visual effect problem is more serious, which will degrade the quality of the image display.

In view of the above, the present invention provides a touch display driver and a driving method for driving an in-cell touch display panel, which can be ended in a certain time interval (for example, within a certain number of frame periods) when the screen display action interval ends. At the time of the touch sensing operation, the gate driving circuit in the touch display driver stops driving on different gate driving lines, that is, the gate driving lines that are stopped by the gate driving circuit are not repeated. (or not fixed), in this way, the gate driving circuit can be prevented from being driven for a long time on the fixed gate driving line, thereby avoiding the gate driving circuit of the in-cell touch display panel corresponding to the fixed gate driving line. The transistor element is degraded by high-voltage driving for a long time, and the effect of the horizontal line visual effect on the image display quality can be reduced.

The touch display driver of the present invention comprises a control circuit, a gate driving circuit and a touch detection circuit. The control circuit is configured to divide each of the plurality of frame periods into a plurality of screen display motion sections and a plurality of touch sensing motion sections. Each of the screen display operation sections and each of the touch sensing operation sections are interlaced, and each touch sensing operation section is displayed after the corresponding screen display operation section. The gate driving circuit is controlled by the control circuit for sequentially driving at least one of the plurality of gate driving lines of the in-cell touch display panel to perform a screen display operation in each screen display operation interval. The touch detection circuit is controlled by the control circuit for controlling the voltage level of the gate drive line of the in-cell touch display panel and performing the touch sensing action in the touch sensing operation sections. The control circuit controls the gate driving circuit to drive a different number of gate driving lines in the initial screen display operation interval of each frame period, so that the gate driving circuit ends when the screens of the frame periods indicate the end of the operation interval Stop driving on different gate drive lines.

In an embodiment of the invention, the control circuit controls the gate driving circuit to display the number of gate driving lines in each of the frame periods of each frame period, so that the frame periods of the frames are At the end of the screen display operation interval, the gate drive circuit stops driving on different gate drive lines.

In an embodiment of the invention, the control circuit adjusts the length of time of each touch sensing operation interval of each frame period.

In an embodiment of the invention, the control circuit dynamically adjusts the number of such frame periods.

In an embodiment of the invention, the number of the frame periods is less than the number of the gate drive lines of the in-cell touch display panel.

The driving method of the present invention includes the following steps. Each of the plurality of frame periods is divided into a plurality of screen display operation sections and a plurality of touch sensing operation sections, and each of the screen display operation sections and each of the touch sensing operation sections are interlaced with each other, and each touch The sensing operation section is displayed after the corresponding operation screen of each screen. In each of the screen display operation sections, at least one of the plurality of gate drive lines of the in-cell touch display panel is sequentially driven by the gate drive circuit to perform a screen display operation, and the touch sensing actions are performed. In the interval, the voltage detection level of the gate driving lines of the in-cell touch display panel is controlled by the touch detection circuit, and the touch sensing operation is performed, wherein the gate driving circuit is enabled in each frame period. In the initial screen display, a different number of gate drive lines are driven in the operation section, so that the gate drive circuit stops driving on different gate drive lines when the screen display operation intervals of the frame periods are completed.

Based on the above, in the touch display driver and the driving method of the in-cell touch display panel according to the embodiment of the present invention, the action interval can be displayed in a certain time interval (for example, within a certain number of frame periods) At the end (because of the touch sensing action), the gate driving circuit in the touch display driver will stop driving on different gate driving lines, that is, the gate driving circuit stops driving at the end of the screen display operation interval. The gate drive line is not fixed. In this way, the transistor component in the gate driving circuit corresponding to the fixed gate driving line can be prevented from being deteriorated by the high-voltage driving for a long time, and the influence of the horizontal line visual effect problem on the image display quality can be reduced.

The above described features and advantages of the invention will be apparent from the following description.

DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the exemplary embodiments embodiments In addition, wherever possible, the same reference numerals in the drawings

2 and FIG. 3, FIG. 2 is a circuit block diagram of a touch display driver for driving an in-cell touch display panel according to an embodiment of the invention, and FIG. 3 is a block diagram of FIG. The driving sequence diagram of the touch display driver in successive m frame periods, wherein the quantity m is an adjustable positive integer. The touch display driver 100 can be used to drive the in-cell touch display panel 800. The in-cell touch display panel 800 has x gate drive lines G1 G Gx, wherein the number x can be any positive integer, and the number m is less than the number x. In fact, the number of gate drive lines that the in-cell touch display panel 800 has may depend on actual application or design requirements.

The touch display driver 100 may include a control circuit 120, a gate driving circuit 140, and a touch detection circuit 160, but the present invention is not limited thereto. The control circuit 120 can divide each frame period into a plurality of screen display motion intervals and a plurality of touch sensing motion intervals, wherein the number of motion display intervals and the touch sensing actions in each frame period The number of intervals can be determined by actual application or design needs. For convenience of explanation, it is assumed here that, as shown in FIG. 3, the control circuit 120 can sequentially divide the frame period FP1 into a screen display operation interval DP1_1, a touch sensing operation interval TP1_1, a screen display operation interval DP1_2, The touch sensing operation section TP1_2 and the screen display operation section DP1_3; the control circuit 120 can divide the frame period FP2 into a screen display operation section DP2_1, a touch sensing operation section TP2_1, a screen display operation section DP2_2, and a touch. The sensing operation section TP2_2 and the screen display operation section DP2_3; the control circuit 120 can sequentially divide the frame period FPm into the screen display operation section DPm_1, the touch sensing operation section TPm_1, the screen display operation section DPm_2, and the touch sensing. The action interval TPm_2 and the screen display action interval DPm_3, and the rest of the frame period can be deduced by analogy, but the invention is not limited thereto.

The gate drive circuit 140 is controlled by the control circuit 120. In the frame period FP1 shown in FIG. 3, the gate driving circuit 140 sequentially drives at least one gate driving line of the in-cell touch display panel 800 to perform a screen display operation in the screen display operation section DP1_1. . Similarly, the gate driving circuit 140 sequentially drives at least one gate driving line of the in-cell touch display panel 800 to perform a screen display operation in the screen display operation sections DP1_2 and DP1_3, respectively. The operation of the screen display operation interval of the gate driving circuit 140 in the frame period FP2~FPm can be deduced by analogy, and therefore will not be described again.

The touch detection circuit 160 is controlled by the control circuit 120. In the frame period FP1 shown in FIG. 3, the touch detection circuit 160 can control the voltage level of the gate driving lines G1 G Gx of the in-cell touch display panel 800 in the touch sensing operation interval TP1_1. And touch sensing action. In the embodiment of the present invention, in the touch sensing action interval TP1_1, the touch detection circuit 160 can control the gate driving lines G1 G Gx to maintain a fixed voltage level, or can drive the gate driving line G1. The voltage signal of the ~Gx is synchronized with the touch drive signal of the common electrode of the in-cell touch display panel 800 to reduce the driving load when the touch sensing operation is performed, but the present invention is not limited thereto. Similarly, the touch detection circuit 160 can control the voltage level of the gate drive lines G1 G Gx of the in-cell touch display panel 800 in the touch sensing operation interval TP1_2 and perform a touch sensing operation. The operation of the touch sensing operation interval of the gate driving circuit 140 in the frame period FP2~FPm can be deduced by analogy, and therefore will not be described again.

In particular, in the continuous m frame periods FP1 FPm shown in FIG. 3, the control circuit 120 can control the gate driving circuit 140 to drive different numbers of gates in the initial screen display operation interval of each frame period. Extreme drive line. For example, the control circuit 120 may control the gate drive circuit 140 in the frame period FP1 start screen displayed in the operation section DP1_1 Article I ₁ sequentially drives the gate driving lines G1 ~ GI _1; the control circuit 120 may control the gate The driving circuit 140 sequentially drives the I ₂ gate driving lines G1 GI GI _{2 in the} initial screen display operation interval DP2_1 of the frame period FP2; similarly, the control circuit 120 can control the gate driving circuit 140 at the frame period FPM The start screen display action interval DPm_1 sequentially drives the I _m gate drive lines G1 GI GI _m , wherein the numbers I ₁ , I ₂ , . . . , I _m may be positive integers less than the number x, and the number I ₁ , I ₂ , ..., I _m are different from each other and can be obtained in a random manner. In addition to this, the present invention does not limit the size relationship between the numbers I ₁ , I ₂ , ..., I _m . In this manner, in the frame periods FP1 to FPm, when the start screen display operation sections DP1_1, DP2_1, ..., DPm_1 are completed and the touch sensing operation of the in-cell touch display panel 800 is started, the gate drive is started. The circuit 140 will stop driving on the different gate driving lines GI ₁ , GI ₂ , . . . , GI _m respectively, so that the gate driving circuit 140 can be avoided in a certain time interval (ie, continuous m frame periods FP1 FPm). Stop driving on a fixed gate drive line, resulting in a horizontal line visual effect problem.

In an embodiment of the present invention, in the continuous m frame periods FP1 FPm shown in FIG. 3, the control circuit 120 can control the gate driving circuit 140 to drive in the remaining screen display action intervals of each frame period. The same number of gate drive lines, but the invention is not limited thereto. For example, the control circuit 120 can control the gate driving circuit 140 to sequentially drive the K gate driving lines G(I ₁ +1)~G(I ₁ +K in the remaining screen display operation interval DP1_2 of the frame period FP1. The control circuit 120 can control the gate driving circuit 140 to sequentially drive the K gate driving lines G(I ₂ +1)~G(I ₂ +K) in the remaining screen display operation interval DP2_2 of the frame period FP2; And so on, the control circuit 120 can control the gate driving circuit 140 to sequentially drive the K gate driving lines G(I _m +1)~G(I _m +K in the remaining screen display operation interval DPm_2 of the frame period FPm. ), where the number K can be a positive integer less than the number x. In this manner, in the continuous m frame periods FP1 to FPm shown in FIG. 3, when the screen display operation sections DP1_2, DP2_2, ..., DPm_2 are completed, the touch sensing of the in-cell touch display panel 800 is started. During operation, the gate driving circuit 140 stops driving on different gate driving lines G(I ₁ +K), G(I ₂ +K), ..., G(I _m +K), respectively, but the present invention Not limited to this.

In another embodiment of the present invention, in the consecutive m frame periods FP1 FPm shown in FIG. 3, the control circuit 120 can also control the gate driving circuit 140 to display the action interval on the remaining screens of each frame period. Driving a different number of gate drive lines. For example, the control circuit 120 can control the gate driving circuit 140 to sequentially drive K ₁ gate driving lines G(I ₁ +1)~G(I ₁ + in the remaining screen display operation interval DP1_2 of the frame period FP1. K ₁ ); The control circuit 120 can control the gate driving circuit 140 to sequentially drive the K ₂ gate driving lines G(I ₂ +1)~G(I ₂ + in the remaining screen display operation interval DP2_2 of the frame period FP2. K ₂ ); and so on, the control circuit 120 can control the gate driving circuit 140 to sequentially drive the K _m gate driving lines G(I _m +1)~G in the remaining screen display operation intervals DPm_2 of the frame period FPm. (I _m + K _m ), wherein the quantities K ₁ , K ₂ , ..., K _m may be positive integers less than the number x, and the quantities (I ₁ + K ₁ ), (I ₂ + K ₂ ), ... , (I _m + K _m ) are different from each other. In addition to this, the present invention does not limit the magnitude relationship between the numbers (I ₁ + K ₁ ), (I ₂ + K ₂ ), ..., (I _m + K _m ). In this manner, in the continuous m frame periods FP1 to FPm shown in FIG. 3, when the screen display operation sections DP1_2, DP2_2, ..., DPm_2 are completed, the touch sensing of the in-cell touch display panel 800 is started. During operation, the gate driving circuit 140 stops driving on different gate driving lines G(I ₁ +K ₁ ), G(I ₂ +K ₂ ), . . . , G(I _m +K _m ), respectively. The invention is not limited thereto. In fact, in the above-described consecutive m frame periods FP1 to FPm, when the screen display operation sections DP1_2, DP2_2, ..., DPm_2 are completed, the gate drive lines for which the gate drive circuit 140 stops driving are different, that is, It is the spirit of the invention.

Therefore, in the continuous m frame periods FP1 to FPm shown in FIG. 3, the control circuit 120 can control the gate driving circuit 140 to display the gate driving in the operation section for each frame period of each frame period. The number of drive lines is such that the gate drive circuit 140 stops driving on different gate drive lines when each of the screen display periods of each of the continuous frame period FP1 to FPm ends. In this way, based on the effect of the visual persistence of the human eye, the problem of the visual effect of the horizontal line can be greatly improved.

In an embodiment of the invention, the control circuit 120 can adjust the length of each touch sensing action interval of each frame period to adjust the gate driving circuit corresponding to the gate driving line that is stopped driving. The time during which the transistor element is degraded by high voltage. For example, as shown in FIG. 3, control circuit 120 can adjust the frame period FP1 touch sensing operation section TP1_1 length of time, in order to adjust the gate drive line GI ₁ corresponding to the electrical gate electrode driving circuit 140 The time during which the crystal element is degraded by high pressure. When the time length of the touch sensing operation section TP1_1 is shorter, the time during which the transistor element in the gate driving circuit 140 corresponding to the gate driving line GI ₁ is degraded by the high voltage is shorter, and vice versa. The remaining touch sensing action intervals TP1_2, TP2_1, TP2_2, TPm_1, TPm_2 can also be deduced by analogy.

In an embodiment of the invention, control circuit 120 can also dynamically adjust the value of the number m. When the value of the quantity m is larger, it means that within the longer time interval (that is, within a more continuous frame period), the gate driving line that the gate driving circuit 140 stops driving does not overlap. ,vice versa.

In an embodiment of the invention, the control circuit 120 can be a hardware, a firmware, or a software or machine stored in a memory and loaded by a micro processor or a digital signal processor (DSP). Executable code. If implemented by hardware, the control circuit 120 may be implemented by a plurality of circuit chips or by a single integrated circuit chip, but the invention is not limited thereto. The plurality of circuit chips or the single integrated circuit chip may be implemented by using a special function integrated circuit (ASIC) or a programmable logic gate array (FPGA). The above memory may be, for example, a random access memory, a read only memory, a flash memory, or the like. In addition, the implementation details of the gate driving circuit 140 and the touch detection circuit 160 are not the focus of the improvement of the present invention, and are familiar to those skilled in the art, and thus are not described herein.

FIG. 4 is a flow chart showing the steps of a driving method according to an embodiment of the invention. Referring to FIG. 2 to FIG. 4 simultaneously, the driving method of the exemplary embodiment can be used to drive the in-cell touch display panel 800 shown in FIG. 2 . The driving method of the exemplary embodiment includes the following steps. First, in step S400, each of a plurality of frame periods (for example, m frame periods FP1 to FPm shown in FIG. 3) (for example, frame period FP1) is divided into a plurality of screen display operation sections. (For example, DP1_1, DP1_2, DP1_3, but not limited to this) and a plurality of touch sensing operation sections (for example, TP1_1, TP1_2, but not limited thereto), wherein the screen displays an operation section (for example, DP1_1, DP1_2, DP1_3) and touch The sensing operation sections (for example, TP1_1, TP1_2) are interlaced with each other, and the touch sensing operation section (for example, TP1_1) is displayed after the corresponding screen display operation section (for example, DP1_1).

Next, in step S410, in each of the screen display operation sections, at least one gate driving line of the in-cell touch display panel 800 is sequentially driven by the gate driving circuit 140 to perform a screen display operation; In one touch sensing operation interval, the touch detection circuit 160 controls the voltage level of the gate driving lines G1 G Gx of the in-cell touch display panel 800 and performs a touch sensing operation. In particular, a different number of gate drive lines can be driven by the gate drive circuit 140 in the start screen display operation interval of each of the m frame periods FP1 to FPm. For example, as previously described, may be transmitted through the gate drive circuit 140 in the frame period FP1 start screen displayed in the operation section DP1_1 Article I ₁ sequentially drives the gate driving lines G1 ~ GI _1; may be driven through the gate electrode The circuit 140 sequentially drives the I ₂ gate drive lines G1 GI GI _{2 in the} start screen display operation interval DP2_1 of the frame period FP2; and so on, the gate drive circuit 140 can be started at the frame period FPm. The screen display operation interval DPm_1 sequentially drives the I _m gate drive lines G1 GI GI _m , wherein the numbers I ₁ , I ₂ , . . . , I _m may be positive integers smaller than the number x, and the numbers I ₁ , I ₂ , ..., I _m are different from each other and can be obtained in a random manner. In addition to this, the present invention does not limit the size relationship between the numbers I ₁ , I ₂ , ..., I _m . In this manner, when the start screen display operation sections DP1_1, DP2_1, . . . , DPm_1 are completed and the touch sensing operation of the in-cell touch display panel 800 is started, the gate driving circuit 140 stops driving at different gates. Since the gate drive lines GI ₁ , GI ₂ , ..., GI _{m are} on, the gate drive circuit 140 can be prevented from being driven on the same gate drive line in a plurality of time intervals (ie, consecutive m frame periods FP1 to FPm). This leads to a horizontal line visual effect problem.

In addition, the details of the driving method of the embodiment of the present invention can be sufficiently illustrated, suggested, and implemented by the description of the embodiment of FIG. 2 and FIG. 3, and thus will not be described again.

In summary, in the touch display driver and the driving method of the in-cell touch display panel according to the embodiment of the present invention, the screen can be displayed in a plurality of time intervals (for example, within a certain number of frame periods). At the end of the action interval (because of the touch sensing action), the gate drive circuit in the touch display driver will stop driving on the different gate drive lines, that is, the gate drive lines that the gate drive circuit stops driving. Not fixed. In this way, the transistor component in the gate driving circuit corresponding to the fixed gate driving line can be prevented from being deteriorated by the high-voltage driving for a long time, and the influence of the horizontal line visual effect problem on the image display quality can be reduced.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100‧‧‧Touch display driver
120‧‧‧Control circuit
140‧‧‧ gate drive circuit
160‧‧‧Touch detection circuit
800,900‧‧‧In-cell touch display panel
910‧‧‧ horizontal lines
DP_A, DP_B, DP1_1, DP1_2, DP1_3, DP2_1, DP2_2, DP2_3, DPm_1, DPm_2, DPm_3‧‧‧ screen display action interval
FP1, FP2, ..., FPm, FPy‧‧‧ frame cycle
G1~Gx, G(n-1), Gn, G(n+1), G(n+2), Gm, GI ₁ , GI ₂ , GI _m , G(I ₁ +1), G(I ₂ +1), G(I _m +1), G(I ₁ +K), G(I ₂ +K), G(I _m +K), G(I ₁ + K ₁ ), G(I ₂ + K ₂ ), G(I _m +K _m )‧‧‧ gate drive line
R, G, B‧‧‧ sub-pixel units
S400, S410‧‧‧ steps
TP_A, TP1_1, TP1_2, TP2_1, TP2_2, TPm_1, TPm_2‧‧‧ touch sensing action interval

FIG. 1 is a schematic diagram of a plurality of horizontal stripes appearing in a general in-cell touch display panel when a screen is displayed. 2 is a circuit block diagram of a touch display driver for driving an in-cell touch display panel according to an embodiment of the invention. 3 is a schematic diagram showing the driving sequence of the touch display driver of FIG. 2 in a continuous M frame period. FIG. 4 is a flow chart showing the steps of a driving method according to an embodiment of the invention.

100‧‧‧Touch display driver

120‧‧‧Control circuit

140‧‧‧ gate drive circuit

160‧‧‧Touch detection circuit

800‧‧‧In-cell touch display panel

G1~Gx‧‧‧ gate drive line

Claims (10)

A touch display driver for driving an in-cell touch display panel includes: a control circuit for dividing each of the plurality of frame periods into a plurality of screens to display an action interval and a plurality of touches In the touch sensing operation section, each of the screen display operation sections and each of the touch sensing operation sections are interlaced, and each of the touch sensing operation sections is subsequent to each of the corresponding screen display operation sections; a gate driving circuit, Controlling the control circuit for sequentially driving at least one of the plurality of gate driving lines of the in-cell touch display panel to perform a screen display operation in each of the screen display operation intervals; and one touch The control detection circuit is controlled by the control circuit for controlling the voltage level of the gate driving lines of the in-cell touch display panel and performing a touch sense in the touch sensing operation intervals The control circuit controls the gate driving circuit to drive a different number of the gate driving lines in a start screen display operation interval of each frame period, so as to make the frame periods Picture At the end of the display action interval, the gate drive circuit stops driving on the different gate drive lines. The touch display driver of claim 1, wherein: the control circuit controls the gate driving circuit to drive the gate driving lines in each of the screen display operation intervals of the frame period The number is such that when the screen display operation intervals of the frame periods are completed, the gate driving circuit stops driving on the different gate driving lines. The touch display driver of claim 1, wherein: the control circuit adjusts a length of time of each of the touch sensing action intervals of each frame period. The touch display driver of claim 1, wherein the control circuit dynamically adjusts the number of the frame periods. The touch display driver of claim 4, wherein the number of the frame periods is less than the number of the gate drive lines of the in-cell touch display panel. A driving method of an in-cell touch display panel includes: dividing each of a plurality of frame periods into a plurality of screen display motion sections and a plurality of touch sensing motion sections, each of which displays an action section And each of the touch sensing operation sections are interlaced with each other, and each of the touch sensing operation sections is subsequent to each of the corresponding screen display operation sections; and in each of the screen display operation sections, sequentially passed through a gate driving circuit Driving at least one of the plurality of gate drive lines of the in-cell touch display panel to perform a screen display operation, and controlling the inline through a touch detection circuit in the touch sensing operation intervals a voltage sensing level of the gate driving lines of the touch display panel and performing a touch sensing operation, wherein the gate driving circuit drives different numbers in a starting screen display operation interval of each frame period The gate drive lines are such that when the screen display operation intervals of the frame periods are completed, the gate drive circuit stops driving on the different gate drive lines. The driving method of claim 6, further comprising: adjusting the number of the gate driving lines driven by the gate driving circuit among the screen display operation intervals of each frame period, When the screen display operation intervals of the frame periods are completed, the gate driving circuit stops driving on the different gate driving lines. The driving method of claim 6, further comprising: adjusting a length of time of each of the touch sensing action intervals of each frame period. The driving method described in claim 6 further includes: dynamically adjusting the number of the frame periods. The driving method of claim 9, wherein the number of the frame periods is less than the number of the gate driving lines of the in-cell touch display panel.