TWI522863B - Touch display module and driving method thereof and source driver - Google Patents

Description

Touch display module, driving method thereof and source driver

The present invention relates to an electronic device, and more particularly to a touch display module, a driving method thereof and a source driver.

A gate driver and a source driver respectively drive a scan line (gate line) and a data line (source line) of the liquid crystal display panel. The gate driver sequentially supplies a voltage to turn on the pixels of the scan line, and the source driver provides a pixel drive signal associated with the image data to the data line. Therefore, the source driver can drive the liquid crystal display panel to display the corresponding image.

The in-cell touch display panel places the touch sensor into the display panel. Compared with the conventional touch display panel in which the touch panel and the display panel are bonded to each other, the embedded touch display panel has the advantages of low thickness, high light transmittance and the like. The touch driving circuit for detecting the touch event of the embedded touch display panel includes a transmitter (Tx) and a receiver (Rx). The transmitter transmits the touch driving signal to the driving line of the embedded touch display panel, and the receiver senses the embedded touch display The sensing line of the panel. Conventional touch drive circuits are independent of the source driver.

The invention provides a touch display module, a driving method thereof and a source driver, which can use a source driver as a transmitter for touch detection.

The embodiment of the invention discloses a touch display module comprising a touch display panel and at least one source driver. The touch display panel has a plurality of data lines. The source driver is coupled to the data line of the touch display panel. The source driver provides a plurality of pixel driving signals to the data lines in the display mode to drive the touch display panel to display corresponding images. The source driver groups the data lines into a plurality of groups in the touch mode, and outputs the plurality of touch driving signals to the groups in the touch mode. In the touch mode, the data lines belonging to the same group are provided with the same touch driving signal.

Embodiments of the present invention disclose a source driver including a reference voltage bus, a plurality of drive channels, and a voltage generating circuit. Each drive channel includes a latch and a first multiplexer. The latch latches in display mode and outputs pixel data. The latch latches in touch mode and outputs the grouped data. The control end of the first multiplexer is coupled to the output of the latch to receive pixel data or group data. The plurality of inputs of the first multiplexer are coupled to the different wires of the reference voltage bus in a one-to-one manner. The output of the first multiplexer outputs one of the pixel drive signals or one of the touch drive signals. A plurality of outputs of the voltage generating circuit are coupled to the wires of the reference voltage bus in a one-to-one manner. Wherein, the voltage generating circuit is displayed The mode provides a plurality of gamma voltages to the inputs of the first multiplexers via the reference voltage bus, and provides a plurality of touch panel signals to the inputs of the first multiplexers via the reference voltage bus in the touch mode. end.

Embodiments of the present invention disclose a driving method of a touch display module. The driving method includes: providing a plurality of pixel driving signals to the plurality of data lines of the touch display panel in the display mode to drive the touch display panel to display corresponding images; and grouping the data lines into multiple groups in the touch mode a group; and outputting a plurality of touch driving signals to the groups in the touch mode. In the touch mode, the data lines belonging to the same group are provided with the same touch driving signal.

In an embodiment of the invention, the touch driving signal comprises a sinusoidal signal or a cosine signal.

In an embodiment of the invention, the voltage generating circuit is a gamma voltage generating circuit.

In an embodiment of the invention, the voltage generating circuit includes a gamma voltage generating circuit and a touch panel signal generating circuit. A plurality of outputs of the gamma voltage generating circuit are coupled to the wires of the reference voltage bus in a one-to-one manner. The gamma voltage generating circuit provides a plurality of gamma voltages to the input of the first multiplexer via the reference voltage bus in the display mode. The gamma voltage generating circuit is disabled in the touch mode. The plurality of outputs of the touch panel signal generating circuit are coupled to the wires of the reference voltage busbar in a one-to-one manner. The touch panel signal generating circuit provides a plurality of touch panel signals to the input end of the first multiplexer via the reference voltage bus in the touch mode. The touch panel signal generating circuit is disabled in the display mode.

In an embodiment of the invention, the touch panel signal generating circuit includes a touch panel signal generator and a plurality of second multiplexers. The touch panel signal generator generates the touch panel signals. The plurality of input ends of any one of the second multiplexers are coupled to the touch panel signal generator to receive the touch panel signals. An output of any of the second multiplexers is coupled to one of the wires of the reference voltage bus.

Based on the above, the touch display module and the driving method thereof according to the embodiments of the present invention can use the source driver as a transmitter for touch detection. The touch display module and the driving method thereof according to some embodiments of the present invention can group a plurality of data lines into a plurality of groups in a touch mode, and provide the same touch driving signals to the data belonging to the same group. line. Therefore, the source driver disclosed in the embodiment of the present invention may be different in display resolution and touch resolution. Furthermore, grouped data lines (and/or drive channels) can transmit more energy for touch detection.

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

100‧‧‧Touch display module

110‧‧‧ Controller

120‧‧‧gate driver

130‧‧‧Source Driver

140‧‧‧Touch display panel

150‧‧‧Touch Receiver

131‧‧‧Reference voltage bus

132_1, 132_2, 132_3, 132_4, 132_5, 132_6, 132_n‧‧‧ drive channels

133, 310‧‧‧ voltage generation circuit

134‧‧‧Shift register

211‧‧‧First Latch

212‧‧‧Second latch

213‧‧‧First multiplexer

214‧‧‧buffer

220, 320‧‧‧ gamma voltage generating circuit

230‧‧‧Touch panel signal generation circuit

231‧‧‧Touch panel signal generator

232‧‧‧Second multiplexer

D_1, D_2, D_3, D_4, D_5, D_6, D_n‧‧‧ data lines

S_1, S_2, S_3, S_m‧‧‧ scan lines

FIG. 1 is a block diagram showing a circuit of a touch display module according to an embodiment of the invention.

2 is a block diagram showing the circuit of the source driver shown in FIG. 1 according to an embodiment of the invention.

3 is a block diagram showing the circuit of the source driver shown in FIG. 1 according to another embodiment of the present invention.

The term "coupled" as used throughout the specification (including the scope of the patent application) may be used in any direct or indirect connection. For example, if the first device is described as being coupled to the second device, it should be construed that the first device can be directly connected to the second device, or the first device can be connected through other devices or some kind of connection means. Connected to the second device indirectly. In addition, wherever possible, the elements and/ Elements/components/steps that use the same reference numbers or use the same terms in different embodiments may refer to the related description.

FIG. 1 is a block diagram showing a circuit of a touch display module 100 according to an embodiment of the invention. The touch display module 100 includes a controller 110, at least one gate driver 120, at least one source driver 130, a touch display panel 140, and at least one touch receiver 150. The touch display panel 140 has a plurality of data lines (for example, data lines D_1, D_2, D_3, D_4, D_5, D_6, ..., D_n) and a plurality of scan lines (for example, scan lines S_1, S_2, S_3, ..., S_m). The gate driver 120 is coupled to the scan lines S_1 S S_m of the touch display panel 140 , and the source driver 130 is coupled to the data lines D_1 D D_n of the touch display panel 140 . The driving method of the touch display module 100 is as follows.

Gate driver 120 and source driver according to control of controller 110 The scan lines (gate lines) S_1~S_m and the data lines (source lines) D_1~D_n of the touch display panel 140 are respectively driven in the display mode. The gate driver 120 sequentially supplies a voltage to turn on the pixels of the scan lines S_1 to S_m, and the source driver 130 supplies a plurality of pixel driving signals related to the image data to the data lines D_1 to D_n, respectively. Therefore, the source driver 130 can drive the touch display panel 140 to display a corresponding image in the display mode. In the display mode, the touch receiver 150 can be disabled.

In the touch mode, the gate driver 120 can be disabled and the touch receiver 150 can be enabled. The source driver 130 groups the data lines D_1 to D_n into a plurality of groups in the touch mode. The source driver 130 outputs a plurality of touch driving signals to the groups in the touch mode, wherein the data lines belonging to the same group in the touch mode are provided with the same touch driving signal. In other words, the source driver 130 can be used as a transmitter (Tx) for touch detection in the touch mode, and the data lines D_1~D_n can be used as the touch panel driver in the touch mode. Line use. The touch driving signal includes a sinusoidal signal, a cosine signal, a clock pulse or other driving signals for touch detection. According to the touch driving signals of the data lines D_1~D_n, the touch receiver (receiver, Rx) 150 can sense/read the information of the scan lines S_1~S_m in the touch mode, and transmit the information to the controller. 110. The controller 110 can determine whether the touch display panel 140 has a touch event and obtain a touch position on the touch display panel 140 by analyzing/calculating the information provided by the touch receiver 150.

For example, in some embodiments, the data lines D_1~D_3 can be The first touch driving signals provided by the source driver 130 are collectively transmitted by the first group, and the data lines D_4 D D_6 can be grouped into the second group to jointly transmit the second touch provided by the source driver 130. Control the drive signal, and so on. In other embodiments, the data lines D_1~D_6 may be grouped into a first group to jointly transmit the first touch driving signal provided by the source driver 130, and the data lines D_7~D_12 (not shown) may be The second touch driving signals provided by the source driver 130 are collectively transmitted by the second group. During the driving of these groups, the touch receiver 150 can sense/read the information of the groups in the touch mode and transmit the information to the controller 110.

The data line D_1~D_n grouping method should not be limited to the above method. In other embodiments, the number of data lines in different groups may be different from each other. For example, the number of data lines in the group at the edge of the touch display panel 140 may be greater than the number of data lines in the group in the central area of the touch display panel 140. In other embodiments, the touch display panel 140 may be defined with a stylus touch area (to detect a touch event of the stylus) and a finger touch area (to detect a touch event of the finger). Due to the different touch areas, the touch area of the stylus requires a higher touch resolution, while the touch area of the finger requires a lower touch resolution. Therefore, the number of data lines of the group in the finger touch area of the touch display panel 140 may be greater than the number of data lines of the group in the touch pen touch area of the touch display panel 140.

In summary, the source driver 130 can be used as a transmitter for touch detection in the touch mode, and the data lines D_1~D_n can be used as the driving electrodes of the touch sensor in the touch mode. The scan lines S_1~S_m can be in touch mode. Used as a sensing electrode for touch sensors. The data lines D_1~D_n can be grouped into multiple groups. In the touch mode, the touch resolution of the touch display panel 140 can be determined according to design requirements. In other words, the display resolution can be different from the touch resolution. Moreover, compared to the energy transmitted by a single data line, grouped data lines (multiple data lines belonging to the same group) can collectively transmit more energy for touch detection.

FIG. 2 is a block diagram showing the circuit of the source driver 130 of FIG. 1 according to an embodiment of the invention. The source driver 130 shown in FIG. 2 includes a reference voltage bus bar 131, a plurality of driving channels (eg, driving channels 132_1, 132_2, 132_3, 132_4, 132_5, 132_6, ..., 132_n), a voltage generating circuit 133, and a shift register. (shift register) 134. Each of the drive channels 132_1~132_n includes a latch and a first multiplexer. The drive channel 132_1 will be exemplified below, and the remaining drive channels 132_2~132_n can be deduced by analogy.

The drive channel 132_1 includes a first latch 211, a second latch 212, a first multiplexer 213, and a buffer 214. In some embodiments, buffer 214 may be implemented as a unity-gain buffer. The input of the first latch 211 receives the pixel data provided by the controller 110. The trigger terminal of the first latch 211 receives the latch clock provided by the shift register 134. The input end of the second latch 212 is coupled to the output end of the first latch 211. The trigger end of the second latch 212 receives the line latch signal provided by the controller 110. The second latch 212 in the display mode determines whether to latch and output the pixel data provided by the first latch 211 according to the line latch signal provided by the controller 110. The second latch 212 is latched in the touch mode Lock and output the grouped data.

The control end of the first multiplexer 213 is coupled to the output of the second latch 212 to receive pixel data or group data. The plurality of inputs of the first multiplexer 213 are coupled to different wires of the reference voltage bus bar 131 in a one-to-one manner. The first multiplexer 213 can select one of the plurality of wires of the reference voltage bus bar 131 according to the pixel data provided by the second latch 212 in the display mode, and select the gamma of the wire (GAMMA). The voltage (or gray scale voltage) is transmitted to the output of the first multiplexer 213. Therefore, the output end of the first multiplexer 213 can output the pixel driving signal corresponding to the pixel data in the display mode. The first multiplexer 213 can be regarded as a Digital-to-Analog Converter (DAC). By the way, the first multiplexer 213 can couple one of the plurality of wires of the reference voltage bus bar 131 to the first multiplexer 213 according to the grouping data provided by the second latch 212 in the touch mode. Output. Therefore, the output end of the first multiplexer 213 can output one of the touch driving signals corresponding to the group in the touch mode.

The input end of the buffer 214 is coupled to the output of the first multiplexer 213. The output end of the buffer 214 is coupled to one of the data lines D_1 D D_n of the touch display panel 140. In other embodiments, the buffer 214 can be omitted depending on design requirements. When the buffer 214 is omitted, the output end of the first multiplexer 213 can be coupled to the corresponding data line D_1 of the touch display panel 140.

The plurality of outputs of the voltage generating circuit 133 are coupled to different wires of the reference voltage bus bar 131 in a one-to-one manner. The voltage generating circuit 133 provides a plurality of gamma voltages (fixed voltages) of different levels via the reference voltage bus bar 131 in the display mode. The input to the first multiplexer 213 of the drive channels 132_1~132_n. The voltage generating circuit 133 provides a plurality of touch panel signals to the input end of the first multiplexer 213 of the driving channels 132_1 132 132_n via the reference voltage bus bar 131 in the touch mode. In this embodiment, the touch panel signal includes a sinusoidal signal or a cosine signal. In other embodiments, the touch panel signal includes a plurality of clock pulses of different phases or other driving signals for touch detection.

In the embodiment shown in FIG. 2, the voltage generating circuit 133 includes a gamma voltage generating circuit 220 and a touch panel signal generating circuit 230. The plurality of outputs of the gamma voltage generating circuit 220 are coupled to different wires of the reference voltage bus bar 131 in a one-to-one manner. The gamma voltage generating circuit 220 supplies a plurality of gamma voltages (fixed voltages of different levels) to the input terminals of the first multiplexer 213 of the driving channels 132_1 132 132_n via the reference voltage bus bar 131 in the display mode. The gamma voltage generating circuit 220 is disabled in the touch mode.

The plurality of outputs of the touch panel signal generating circuit 230 are coupled to different wires of the reference voltage bus bar 131 in a one-to-one manner. The touch panel signal generating circuit 230 provides a plurality of touch panel signals (such as a sinusoidal signal, a cosine signal, a clock pulse or other driving signals for touch detection) to the driving channel via the reference voltage bus 131 in the touch mode. The input of the first multiplexer 213 of 132_1~132_n. The touch panel signal generating circuit 230 is disabled in the display mode.

In the embodiment shown in FIG. 2 , the touch panel signal generating circuit 230 includes a touch panel signal generator 231 and a plurality of second multiplexers 232 . The touch panel signal generator 231 generates the plurality of touch panel signals. The plurality of second multiplexers 232 The plurality of input ends of any one of the input terminals are coupled to different output ends of the touch panel signal generator 231 in a one-to-one manner to receive different touch panel signals. An output of any one of the plurality of second multiplexers 232 is coupled to one of the wires of the reference voltage bus bar 131. The plurality of second multiplexers 232 are controlled by the controller 110.

When the source driver 130 operates in the display mode, the gamma voltage generating circuit 220 supplies a plurality of gamma voltages (fixed voltages of different levels) to the first multiplexer 213 of the driving channels 132_1 132 132_n via the reference voltage bus bar 131 . Input. Therefore, the driving channels 132_1~132_n can convert the image data into related pixel driving signals according to the gamma voltage in the display mode to drive the touch display panel 140 to display the corresponding image.

When the source driver 130 is operated in the touch mode, the touch panel signal generating circuit 230 provides a plurality of touch panel signals (eg, a sinusoidal signal, a cosine signal, a clock pulse, or other for touch detection) via the reference voltage bus 131. The measured drive signal is supplied to the input of the first multiplexer 213 of the drive channels 132_1~132_n. The second latch 212 of the drive channels 132_1~132_n can latch and output corresponding grouping data in the touch mode. According to the grouping data, the driving channels 132_1~132_n and the data lines D_1~D_n may be grouped into multiple groups. For example, but not limited to, in some embodiments, the second latch 212 of the driving channels 132_1~132_2 can output the grouping data "00", and the second latch 212 of the driving channels 132_3~132_4. The grouping data "01" can be output, and the second latch 212 of the driving channels 132_5 to 132_6 can output the grouping data "02". According to the grouping data, the data lines D_1~D_2 can be grouped into the first group to jointly transmit the reference voltage busbar 131. The touch panel signal provided by one wire serves as a touch driving signal, and the data lines D_3~D_4 can be grouped into a second group to jointly transmit the touch panel signal provided by the second wire of the reference voltage bus bar 131 as a touch. The driving signal, and the data lines D_5~D_6 can be grouped into a third group to jointly transmit the touch panel signal provided by the third wire of the reference voltage bus 131 as a touch driving signal.

In other embodiments, the second latch 212 of the drive channels 132_1~132_3 can output the grouping data "00", and the second latch 212 of the driving channels 132_4~132_6 can output the grouping data "02". According to the grouping data, the data lines D_1~D_3 can be grouped into the first group to jointly transmit the touch panel signals provided by the first wires of the reference voltage busbars 131 as the touch driving signals, and the data lines D_4~D_6 can be The group is the second group and commonly transmits the touch panel signal provided by the third wire of the reference voltage bus 131 as a touch driving signal.

As another example, assume that the home drive 130 has 1000 data lines (or drive channels). In this embodiment, the output data of the second latch 212 of the driving channel corresponding to the first to the 100th data lines is 00, and the output data of the second latch 212 of the driving channel corresponding to the 101st to 200th data lines is 01. The output data of the second latch 212 of the driving channel corresponding to the data lines 201 to 300 is 02... and so on. Therefore, this embodiment can group 1000 data lines (or drive channels) into 10 groups (1000/100=10).

After grouping the data lines (or drive channels), the controller 110 can change the touch drive signals of the groups by controlling the plurality of second multiplexers 232. For example, during the first period of the touch mode, the second multiplexer 232 can The sinusoidal signal (+Sin) provided by the touch panel signal generator 231 is transmitted to the first wire of the reference voltage bus bar 131, and the negative sinusoidal signal (-sin) provided by the touch panel signal generator 231 is transmitted to the reference voltage. The second wire of the bus bar 131 transmits the cosine signal (+cos) provided by the touch panel signal generator 231 to the third wire of the reference voltage bus bar 131, and the negative provided by the touch panel signal generator 231 The cosine signal (-cos) is transmitted to the fourth wire of the reference voltage bus bar 131. During the second period of the touch mode, the second multiplexer 232 can transmit the cosine signal (+cos) provided by the touch panel signal generator 231 to the first wire of the reference voltage bus 131, and the touch panel signal The negative cosine signal (-cos) provided by the generator 231 is transmitted to the second wire of the reference voltage bus bar 131, and the sinusoidal signal (+sin) provided by the touch panel signal generator 231 is transmitted to the reference voltage bus bar 131. The third wire and the negative sinusoidal signal (-sin) provided by the touch panel signal generator 231 are transmitted to the fourth wire of the reference voltage bus bar 131.

In summary, in this embodiment, the drive channels 132_1~132_n and the data lines D_1~D_n can be grouped into multiple groups by writing the group data to the second latch 212 of the drive channels 132_1~132_n. Then, the embodiment can change the touch driving signals of the groups by controlling the second multiplexer 232. Therefore, the source driver 130 can be used as a transmitter for touch detection in the touch mode, and the data lines D_1~D_n can be used as the driving electrodes of the touch sensor in the touch mode, and the scan lines are used. S_1~S_m can be used as the sensing electrode of the touch sensor in the touch mode. The touch resolution of the touch display panel 140 in the touch mode can be flexibly determined by the grouping data. Grouped data lines (multiple articles belonging to the same group) The data line can transmit more energy together for touch detection.

In other embodiments, buffer 214 may be a buffer with a signal-conversion function. In the touch mode, the voltage generating circuit 133 can generate a digital signal (touch panel signal) via the reference voltage bus 131 to the first of the driving channels 132_1, 132_2, 132_3, 132_4, 132_5, 132_6, ..., 132_n, respectively. Worker 213. The first multiplexer 213 may select one of the digital signals of the reference voltage bus bar 131 to output to the buffer 214 according to the grouping data provided by the second latch 212 in the touch mode. The buffer 214 receives the digital signal via the first multiplexer 213 in the touch mode, and converts the digital signal into a touch drive signal.

FIG. 3 is a block diagram showing the circuit of the source driver 130 of FIG. 1 according to another embodiment of the present invention. The source driver 130 shown in FIG. 3 includes a reference voltage bus bar 131, a plurality of driving channels (eg, driving channels 132_1, 132_2, 132_3, 132_4, 132_5, 132_6, ..., 132_n), a voltage generating circuit 310, and a shift register. 134. The reference voltage bus bar 131, the drive channels 132_1~132_n) and the shift register 134 shown in FIG. 3 can be analogized with reference to the related description of the embodiment shown in FIG. 2.

In the embodiment shown in FIG. 3, the voltage generating circuit 310 includes a gamma voltage generating circuit 320. The plurality of outputs of the gamma voltage generating circuit 320 are coupled to different wires of the reference voltage bus bar 131 in a one-to-one manner. The gamma voltage generating circuit 320 supplies a plurality of gamma voltages (fixed voltages of different levels) to the first multiplexer 213 of the driving channels 132_1 132 132_n via the reference voltage bus bar 131 in the display mode. Into the end. The gamma voltage generating circuit 320 provides a plurality of touch panel signals (such as a sinusoidal signal, a cosine signal, a clock pulse or other driving signals for touch detection) to the driving channel 132_1 via the reference voltage bus 131 in the touch mode. The input of the first multiplexer 213 of ~132_n.

The embodiment shown in FIG. 3 can also group the drive channels 132_1~132_n and the data lines D_1~D_n into multiple groups by writing the group data to the second latch 212 of the drive channels 132_1~132_n. The plurality of driving channels belonging to the same group in the touch mode output the same touch driving signal. Then, the gamma voltage generating circuit 320 can change the touch driving signals of the groups in this embodiment. Therefore, the source driver 130 can be used as a transmitter for touch detection in the touch mode, and the data lines D_1~D_n can be used as the driving electrodes of the touch sensor in the touch mode, and the scan lines are used. S_1~S_m can be used as the sensing electrode of the touch sensor in the touch mode. In the touch mode, the touch resolution of the touch display panel 140 can be flexibly determined by the group data. Grouped data lines (multiple data lines belonging to the same group) can transmit more energy together for touch detection.

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 module

110‧‧‧ Controller

120‧‧‧gate driver

130‧‧‧Source Driver

140‧‧‧Touch display panel

150‧‧‧Touch Receiver

D_1, D_2, D_3, D_4, D_5, D_6, D_n‧‧‧ data lines

S_1, S_2, S_3, S_m‧‧‧ scan lines

Claims (17)

A touch display module includes: a touch display panel having a plurality of data lines; and at least one source driver coupled to the data lines of the touch display panel, the source driver being in a display mode Providing a plurality of pixel driving signals to the data lines to drive the touch display panel to display a corresponding image, the source driver grouping the data lines into a plurality of groups in a touch mode, and the source The driver outputs a plurality of touch driving signals to the groups in the touch mode, wherein the data lines belonging to the same group in the touch mode are provided with the same touch driving signal, wherein the source is The driver includes: a reference voltage bus; a plurality of driving channels, wherein each of the driving channels includes a latch and a first multiplexer, the latch latches in the display mode and outputs a pixel data, The latch latches and outputs a group of data in the touch mode, and the control end of the first multiplexer is coupled to the output of the latch to receive the pixel data or the group data, the first multiplex The plurality of inputs are coupled to the different wires of the reference voltage bus in a one-to-one manner, and an output of the first multiplexer outputs one of the pixel driving signals or the touch driving signals And a voltage generating circuit having a plurality of outputs coupled to the wires of the reference voltage bus in a one-to-one manner, wherein the voltage generating circuit provides the plurality of gamma via the reference voltage bus in the display mode The voltage is applied to the input ends of the first multiplexers, and the voltage generating circuit is connected to the touch mode via the reference voltage A plurality of touch panel signals are provided to the input ends of the first multiplexers. The touch display module of claim 1, wherein each of the driving channels further includes a unit gain buffer, and an input end of the unit gain buffer is coupled to the first multiplexer The output end of the unit gain buffer is coupled to one of the data lines of the touch display panel. The touch display module of claim 1, wherein the touch panel signal comprises a sinusoidal signal or a cosine signal. The touch display module of claim 1, wherein each of the driving channels further includes a buffer, and an input end of the buffer is coupled to the output end of the first multiplexer An output end of the buffer is coupled to one of the data lines of the touch display panel. The touch display module of claim 4, wherein the touch panel signals comprise a digital signal, and the buffer receives the digital signal via the first multiplexer in the touch mode and The digital signal is converted into the touch drive signal. The touch display module of claim 1, wherein the voltage generating circuit is a gamma voltage generating circuit. The touch display module of claim 1, wherein the voltage generating circuit comprises: a gamma voltage generating circuit, wherein the plurality of outputs are coupled to the reference voltage bus in a one-to-one manner And a wire, wherein the gamma voltage generating circuit supplies the plurality of gamma voltages to the first multiplexers via the reference voltage bus in the display mode The input end, and the gamma voltage generating circuit is disabled in the touch mode; and a touch panel signal generating circuit, wherein the plurality of outputs are coupled to the reference voltage busbars in a one-to-one manner a wire, wherein the touch panel signal generating circuit provides a plurality of touch panel signals to the input ends of the first multiplexers via the reference voltage bus, and the touch panel signal generating circuit is configured by the touch panel signal generating circuit Display mode is disabled. The touch display module of claim 7, wherein the touch panel signal generating circuit comprises: a touch panel signal generator for generating the touch panel signals; and a plurality of second multiplexers The plurality of input ends of any one of the second multiplexers are coupled to the touch panel signal generator to receive the touch panel signals, and one of the second multiplexers The output is coupled to one of the wires of the reference voltage bus. A source driver includes: a reference voltage bus; a plurality of drive channels, wherein each drive channel includes a latch and a first multiplexer, the latch latches in a display mode and outputs a Pixel data, the latch latches in a touch mode and outputs a group of data, and the control end of the first multiplexer is coupled to the output of the latch to receive the pixel data or the group data. The plurality of inputs of the first multiplexer are coupled to different wires of the reference voltage bus in a one-to-one manner, and one output of the first multiplexer outputs one or more of the plurality of pixel driving signals One of the control drive signals; a voltage generating circuit having a plurality of outputs coupled to the wires of the reference voltage bus in a one-to-one manner, wherein the voltage generating circuit provides a plurality of gamma voltages via the reference voltage bus in the display mode to The input ends of the first multiplexers and the voltage generating circuit provide a plurality of touch panel signals to the input ends of the first multiplexers via the reference voltage bus in the touch mode. The source driver of claim 9, wherein the driving channels are grouped into a plurality of groups according to the grouping data, and the driving channels of the same group in the touch mode output the same Touch drive signal. The source driver of claim 9, wherein each of the driving channels further includes a unit gain buffer, and an input end of the unit gain buffer is coupled to the output of the first multiplexer The output end of the unit gain buffer is coupled to one of a plurality of data lines of a touch display panel. The source driver of claim 9, wherein the touch panel signal comprises a sinusoidal signal or a cosine signal. The source driver of claim 9, wherein each of the driving channels further includes a buffer, and an input end of the buffer is coupled to the output end of the first multiplexer, the buffer The output end of the device is coupled to one of a plurality of data lines of a touch display panel. The source driver of claim 13, wherein the touch panel signals comprise a digital signal, and the buffer receives the digital signal and the digits in the touch mode via the first multiplexer The signal is converted to the touch drive signal. The source driver of claim 9, wherein the voltage generating circuit is a gamma voltage generating circuit. The source driver of claim 9, wherein the voltage generating circuit comprises: a gamma voltage generating circuit, wherein the plurality of outputs are coupled to the wires of the reference voltage bus in a one-to-one manner The gamma voltage generating circuit provides a plurality of gamma voltages to the input ends of the first multiplexers via the reference voltage bus in the display mode, and the gamma voltage generating circuit is banned in the touch mode And a touch panel signal generating circuit, wherein the plurality of outputs are coupled to the wires of the reference voltage bus in a one-to-one manner, wherein the touch panel signal generating circuit is in the touch mode via the reference The voltage bus bar provides a plurality of touch panel signals to the input ends of the first multiplexers, and the touch panel signal generating circuit is disabled in the display mode. The source driver of claim 16, wherein the touch panel signal generating circuit comprises: a touch panel signal generator for generating the touch panel signals; and a plurality of second multiplexers, A plurality of input ends of any of the second multiplexers are coupled to the touch panel signal generator to receive the touch panel signals, and an output of any one of the second multiplexers One of the wires coupled to the reference voltage bus.