TW201335821A - Embedded touch control circuit device - Google Patents

Abstract

The present invention relates to an embedded touch control circuit device, which, by means of touching a liquid crystal display unit, obtains a position signal corresponding to the position of the liquid crystal display unit from a data processing unit. The embedded touch control circuit device comprises: a plurality of data lines, interlaced with a plurality of driving lines in the liquid crystal display unit; a timing control unit having a touch control time interval; a plurality of display switches and a plurality of display switches used to generate a touch control signal within the touch control time interval; and a touch detection unit for receiving the touch control signal so as to generate the position signal to the data processing unit accordingly. Therefore, by means of utilizing the embedded touch control circuit device of the present invention to detect the touched position of the liquid crystal display unit, the present invention not only has no need to manufacture an extra touch panel which increases the weight and volume, but also has no need to change the structure of the liquid crystal display, thereby accomplishing a liquid crystal display with a touch control function.

Description

In-line touch circuit device

The present invention relates to a touch circuit device, and more particularly to an in-cell touch circuit device suitable for a Thin Film Transistor Liquid Crystal Display (TFT-LCD).

In today's society, touch-enabled liquid crystal displays have gradually become an important feature of current consumer electronics products, such as smart phone screens, digital camera panels, and displays on tablets.

However, if there is a touch function on the liquid crystal display, the current common method is to separate the touch panel from the liquid crystal display, and then assemble the touch panel together with the liquid crystal display so that the liquid crystal display has a touch function. In other words, the current display with a touch function actually has a touch function after the liquid crystal display itself is superimposed with a set of touch panels, and the liquid crystal display itself has a touch function.

In addition, although the above-mentioned technology can make the liquid crystal display have a touch function, the above-mentioned technology is superimposed on the liquid crystal display by the touch panel, which causes a problem that the weight of the liquid crystal display becomes heavy, the cost becomes high, and the overall brightness decreases.

The inventor of the present invention, due to the spirit of active invention, considers an in-cell touch circuit device, and only by the display principle of the current general liquid crystal display, the liquid crystal display can have the effect of touch, after several research experiments. The invention is finally completed.

In view of the problem that the touch function and the display function need to be separately manufactured, the present invention utilizes the driving line and the data line inside the general liquid crystal display as the sensor, and can directly contact through the in-cell touch circuit device of the present invention. Control the LCD display to get the position of the touch. Therefore, the present invention does not need to separately fabricate the touch panel to increase the weight and volume, and even does not require the touch panel cost at all. At the same time, the present invention can also achieve a liquid crystal display with touch function without changing the fabrication structure of the liquid crystal display.

To achieve the above object, the present invention provides an in-cell touch circuit device that touches a liquid crystal display unit to obtain a position signal corresponding to the position of the liquid crystal display unit in a data processing unit. The touch circuit device includes a plurality of driving lines, a plurality of data lines, a timing control unit, a plurality of touch switches, and a touch detecting unit. Wherein each driving line has a driving line stray capacitance. The plurality of data lines and the plurality of driving lines are disposed across the liquid crystal display unit, and each of the data lines has a data line stray capacitance. The timing control unit has a touch time interval and receives a time control signal generated by the data processing unit to generate a switching signal representative of one of the touch time intervals.

Each of the plurality of touch-opening relationships is electrically connected to a driving line by a driving line of every other quantity, and each of the data lines is electrically connected to a data line. Each of the touch-opening relationships receives the switching signal to generate a horizontal touch signal according to the driving line stray capacitance of the driving line corresponding to the electrically connected connection in the touch time interval, and according to the corresponding electrical connection data line The data line stray capacitance produces a vertical touch signal. The touch detection unit receives the horizontal touch signal and the vertical touch signal to generate a position signal to the data processing unit.

In addition, the touch detection unit of the present invention may include a differential amplifier, a first impedance, a second impedance, a first capacitance, a multiplex selector, and a signal source. The differential amplifier has a first input terminal, a second input terminal, and an output terminal. The first impedance is electrically connected to the first input end. The second impedance is electrically connected to the second input end. The first capacitor is electrically connected to the first input end. The multiplexer is electrically connected to the plurality of touch switches, and sequentially transmits the horizontal touch signal and the vertical touch signal to the second input end. The signal source is electrically connected to the first impedance and the second impedance to provide an oscillation signal to the first impedance and the second impedance. The impedance value of the first impedance is equivalent to the impedance value of the second impedance, and the differential amplifier can output the differentially-touched horizontal touch signal or the vertical touch signal to the output end according to the oscillation signal.

Furthermore, the multiplex selector of the present invention can be electrically connected to the second input via a connection pin. The connection pin has a stray capacitance of a pin, and the capacitance value of the first capacitor is equivalent to the capacitance of the pin stray capacitance and a horizontal touch signal or a vertical touch signal to indicate the liquid crystal. The display unit is not touched.

Furthermore, the touch detection unit of the present invention may further include a second capacitor electrically connected to the second input terminal, and the capacitance value of the first capacitor is equivalent to the second capacitor, and the stray capacitance of the pin and the A horizontal touch signal or a capacitance value in parallel with a vertical touch signal to indicate that the liquid crystal display unit is not touched.

Furthermore, the touch detection unit of the present invention may further include a rectification filter circuit, an integration circuit, and a digital/analog conversion circuit. The rectifying and filtering circuit is electrically connected to the output end of the differential amplifier, the integrating circuit is electrically connected to the rectifying and filtering circuit, and the digital/analog converting circuit is electrically connected to the integrating circuit to generate the position signal to the data processing unit accordingly .

Furthermore, the touch detection unit of the present invention may further include a rectification filter circuit, a peak detection circuit, and a digital/analog conversion circuit. The rectifying and filtering circuit is electrically connected to the output end of the differential amplifier, the peak detecting circuit is electrically connected to the rectifying and filtering circuit, and the digital/analog converting circuit is electrically connected to the peak detecting circuit to generate the position signal to the data accordingly. Processing unit.

Furthermore, the touch detection unit of the present invention may further include a third impedance, and the third group of electrodes is electrically connected between the signal source and the first impedance and the second impedance.

Furthermore, the present invention may further comprise a display control unit, a gate driver, and a data transmitter. The display control unit is configured to receive a clock signal and an image data generated by the data processing unit, so as to store the image data in a buffer unit, and generate a display data and a conduction control signal in the display time interval. The gate driver receives the conduction control signal to sequentially turn on the plurality of driving lines. The data transmitter receives the display data to transmit the display data to a plurality of data lines.

Furthermore, the present invention may further include a plurality of display switches, and each of the driving lines is electrically connected to the gate driver through the corresponding plurality of display switches, and each of the data lines is electrically connected to the corresponding plurality of display switches. Connect to the data transmitter.

In addition, the display time interval and the touch time interval of the present invention may not overlap each other, and the display of the image data and the touch of the position of the liquid crystal display unit are processed in different time intervals.

The above summary and the following detailed description are exemplary in order to further illustrate the scope of the claims. Other objects and advantages of the present invention will be described in the following description and drawings.

Please refer to FIG. 1 , which is a structural diagram of a liquid crystal display having an in-cell touch circuit device according to a preferred embodiment of the present invention. The liquid crystal display includes a data processing unit 100, a display control unit 110, a touch detection unit 120, a timing control unit 130, a liquid crystal display unit 140, a plurality of conductive lines, a plurality of display switches 150, and a plurality of touches. The switch 160, a data transmitter 170, and a gate driver 180 are controlled. In this embodiment, the liquid crystal display has a display and touch function.

The timing control unit 130 has a display time interval and a touch time interval, and receives a time control signal Ct generated by the data processing unit 100 to generate a switching signal St, which is one of the representative touch time intervals, or A switching signal ~St representing the display time interval is generated. The display time interval and the touch time interval do not overlap each other, so that the display of the image data and the touch of the position of the liquid crystal display unit are processed in different time intervals. Therefore, when the timing control unit 130 is in the display time interval, the liquid crystal display unit 140 will be regarded as a display. When the timing control unit 130 is in the touch time interval, the liquid crystal display unit 140 will be used as a touch.

The plurality of conductive lines are composed of a plurality of driving lines G1 to Gn and a plurality of data lines D1 to Dn. The driving lines G1 G Gn are disposed in a horizontal direction, and the data lines D1 D Dn are disposed in a vertical direction, and are disposed to cross each other to the liquid crystal display unit 140 , and form an area of the area at each intersection, as shown in FIG. 1 . The area 145 is shown. In addition, a plurality of driving lines G1 G Gn are electrically connected to the gate driver 180 , and each of the driving lines G1 G Gn has a driving line stray capacitance. The plurality of data lines D1~Dn are electrically connected to the data transmitter 170, and each of the data lines D1~Dn has a data line stray capacitance.

In addition, please refer to Figure 2 at the same time. Each area has a thin film transistor array, and the thin film transistor array includes a thin film transistor 156, a liquid crystal capacitor 157, and a holding capacitor 158 for improving the parasitic capacitance effect and the leakage current effect. Taking the area 145 as an example, the gate of the thin film transistor 156 is electrically connected to the driving line G1, and the drain of the thin film transistor 156 is electrically connected to the data line D1. One end of the liquid crystal capacitor 157 is electrically connected to the source of the thin film transistor 156, and the other end thereof is grounded. One end of the holding capacitor 158 is electrically connected to the source of the thin film transistor 156, and the other end thereof is grounded.

In addition, one of the plurality of touch switches 160 is electrically connected to a driving line by using a driving line of every other quantity, and each of the data lines is electrically connected to a data line. The other end of the touch switch 160 is electrically connected to the touch detecting unit 120. As shown in FIG. 1 , the touch switch 160 is electrically connected to a driving line in every two driving lines, that is, the driving lines electrically connected to the touch switch 160 are the driving lines G1 , G4 , G7 , G10 . Similarly, the touch switch 160 is electrically connected to a driving line in every two data lines, that is, the data lines electrically connected to the touch switch 160 are data lines D1, D4, D7, D10. ..

In addition, each of the driving lines G1 G Gn is electrically connected to the gate driver 180 through the corresponding display switch 150 , and each of the data lines D1 D Dn is electrically connected to the data transmitter 170 through the corresponding plurality of display switches 150 . . The turn-on and turn-off of the touch switch 160 and the turn-on and turn-off of the display switch 150 are controlled according to the switching signals St and ~St, respectively. In this embodiment, when the switching signal St is in the first state (~St is the second state), the display switch 150 is all turned on and the touch switch 160 is turned off, so that the structure of the liquid crystal display is as a general panel. When the switching signal St is in the second state (~St is the first state), the display switch 150 is turned off and the touch switch 160 is selectively turned on, so that the structure of the liquid crystal display can be adapted to touch control.

Referring to FIG. 1 again, the display control unit 110 receives a clock signal Cc and an image data Im generated by the data processing unit 100, so as to store the image data Im in a buffer unit 115, and generate the display time interval. A data SH is displayed to the data transmitter 170, and a conduction control signal Cs is generated to the gate driver 180. In this embodiment, the buffer unit 115 is a temporary storage memory.

The gate driver 180 receives the turn-on control signal Cs to turn on a certain driving line through the corresponding display switch 150 (eg, the gate driver 180 is just turned on to the driving line G2). The data transmitter 170 receives the display data Sh to transmit the display data Sh to the above-mentioned driving line (for example, the driven driving line G2) through the corresponding display switch 150 and through the data lines D1 to Dn. .

The operation of the liquid crystal display as a display will be further described below. Please refer to FIG. 3 at the same time, which is a schematic diagram of a liquid crystal display for display according to a preferred embodiment of the present invention. This embodiment is described by twelve driving lines G1 to G12 and twelve data lines D1 to D12. First, the data processing unit 100 generates a time control signal Ct representing the display time interval, so that the timing control unit 130 generates the switching signals St and ~St representing the liquid crystal display unit 140 for display to the plurality of display switches 150 and the plurality of touches. Control switch 160 (not shown).

Next, the display switch 150 will be turned on and the touch switch 160 will be turned off (not shown). The display control unit 110 then generates the conduction control signal Cs to the gate driver 180 in the display time interval to sequentially turn on the driving lines G1 G G12 through the display switch 150, and simultaneously draw corresponding conduction in the buffer unit 115. The image data Im of the drive line (eg, the gate driver 180 turns on the drive line G2 at this time) generates the display material Sh to the data transmitter 170. Next, the data transmitter 170 transmits the display data Sh through the data lines D1 to D12 to the corresponding driving lines (such as the driving line G2) to display the display data Sh of each of the driving lines G1 G G12 on the liquid crystal display unit 140. The operation of the display of the liquid crystal display unit 140 is completed.

The above is a description of the operation of the liquid crystal display as a display. If a touch detection unit 120 is added to the liquid crystal display, the liquid crystal display can have a touch function in addition to the display function.

As shown in FIG. 1 , the touch detection unit 120 receives the horizontal touch signals Tx1 TTx and the vertical touch signals Ty1 TTya to generate a position signal for touching a position on the liquid crystal display unit 140 . Po to the data processing unit 100. In this embodiment, each of the display switches 150 and each of the touch switches 160 are based on the switching signals St and ~St, and the stray capacitance of the driving lines of the driving lines corresponding to the electrically connected lines in the touch time interval. The horizontal touch signals Tx1~Txa are generated, so that the liquid crystal display unit 140 has the touch sensing in the horizontal direction; and the vertical touch signals Ty1~Tya are generated according to the data line stray capacitance of the correspondingly connected data lines, thereby The liquid crystal display unit 140 has touch sensing in the vertical direction.

Please refer to FIG. 4 at the same time, which is a schematic diagram of a touch detection unit according to a preferred embodiment of the present invention. The touch detection unit 120 detects the presence or absence of a touch using the "micro-impedance change detecting device" of the patent application No. 100103659, which is incorporated by the same inventor, wherein the touch detection unit 120 includes a multiplex selection. The device 200, a connection pin 203, a signal source 210, a first impedance 220, a first capacitor 225, a second impedance 230, a differential amplifier 240, a rectifying and filtering circuit 250, an integrating circuit 260, and A digital/analog conversion circuit 270.

The differential amplifier 240 has a first input terminal I1, a second input terminal I2, and an output terminal Io. The first impedance 220 and the first capacitor 225 are electrically connected to the first input terminal I1, and the second impedance 230 and the connection pin 203 are electrically connected to the second input terminal I2. The connection pin 203 includes a pin stray capacitance 205.

The multiplexer 200 is electrically connected to the plurality of touch switches 160, and sequentially transmits the horizontal touch signals Tx1 to Txa and the vertical touch signals Ty1 to Tya to the second input terminal I2 through the connection pins 203. The signal source 210 is electrically connected to the first impedance 220 and the second impedance 230 to provide an oscillation signal Rp to the first impedance 220 and the second impedance 230. The impedance value of the first impedance 220 is equal to the impedance value of the second impedance 230, and the differential amplifier 240 sequentially outputs the differential touch signal Tx1' after the differential amplification at the output end Io according to the oscillation signal Rp. Txa' and vertical touch signal Ty1'~Tya' (not shown). In this embodiment, the signal source 210 is an oscillator.

When the finger, various types of conductors or objects do not touch the liquid crystal display unit 140, at this time, the capacitance value of the first capacitor 225 is equivalent to the pin stray capacitance 205 and any horizontal touch signal Tx1~Txa, or The capacitance value of a vertical Ty1~Tya parallel connection, and the differential touch signal Tx1'~Txa' and the vertical touch signal Ty1'~Tya' output by the differential amplifier 240 will be zero to indicate liquid crystal The display unit 140 is not touched. In this embodiment, the oscillation signal Rp is a periodic signal, such as a sine wave, a square wave, a triangular wave, or the like. Of course, the oscillating signal Rp may also be a non-periodic wave or even input noise, and the differentially amplified horizontal touch signals Tx1'~Txa' and the vertical touch signals Ty1'~Tya' output by the differential amplifier 240 are also the same. Zero.

When a finger, a variety of conductors or objects touch the liquid crystal display unit 140, the stray capacitance of the drive line on the touched drive lines G1 to Gn and the data line stray capacitance on the data lines D1 to Dn will There is a change, so that the corresponding horizontal touch signals Tx1~Txa and vertical touch signals Ty1~Tya are changed. Then, the voltage division and phase on the second impedance 230 will change, so that the voltage difference between the first input terminal I1 and the second input terminal I2 is different. Therefore, the horizontal touch signals Tx1'~Txa' and the vertical touch signals Ty1'~Tya' corresponding to the differential output of the differential amplifier 240 will not be zero. By measuring the change of the output of the differential amplifier 240, it is possible to distinguish which position of the liquid crystal display unit 140 the finger, various types of conductors or objects touch, and achieve the effect of the touch.

After the differentially amplified horizontal touch signals Tx1'~Txa' and the vertical touch signals Ty1'~Tya' are calculated, the position signal Po is determined, which can be achieved by connecting the other terminals to the output terminal Io. As shown in FIG. 4, the output terminal Io of the differential amplifier 240 is electrically connected to the rectifying and filtering circuit 250. The rectifying and filtering circuit 250 is electrically connected to the integrating circuit 260. The integrating circuit 260 is electrically connected to the digital/analog conversion circuit 270 to generate a position signal Po representing which position the liquid crystal display unit 140 is touched, and transmitted to the data processing unit 100.

In addition, the architecture and operation flow of the embodiment are substantially the same as the above embodiment, with the difference that a second capacitor 235 and a third impedance 215 are added. The second capacitor 235 is electrically connected to the second input end I2, and when the finger, various types of conductors or objects do not touch the liquid crystal display unit 140, the second capacitor 235, the pin stray capacitance 205 and one of the levels The capacitance value of the touch signal Tx1~Txa or the parallel connection with one of the vertical touch signals Ty1~Tya is equivalent to the capacitance value of the first capacitor 225. Therefore, the first input terminal I1 and the second input terminal I2 can also be connected with capacitors having the same capacitance value. The third impedance 215 is electrically connected between the signal source 210 and the first impedance 220 and the second impedance 230 to adjust the voltage distribution of the first impedance 220 and the second impedance 230.

The operation of the liquid crystal display as a touch will be further described below. Please refer to FIG. 5 at the same time, which is a schematic diagram of a liquid crystal display for touch control according to a preferred embodiment of the present invention. This embodiment is described by twelve driving lines G1 to G12 and twelve data lines D1 to D12. First, the data processing unit 100 generates a time control signal Ct representing the touch time interval, so that the timing control unit 130 generates the switching signals St and ~St representing the liquid crystal display unit 140 as touches to the display switch 150 (not shown). And the touch switch 160.

Next, display switch 150 will be turned off, and touch switch 160 will be turned-on. In this embodiment, the display switch 150 and the touch switch 160 are respectively controlled to be turned on/off by the switching signals St and ~St, so that the touch switch 160 is turned off when the display switch 150 is turned on, and the touch switch is turned off when the display switch 150 is turned off. 160 is conductive. At this time, if one display position A is pressed on the liquid crystal display unit 140, as shown in FIG. 5, the pressed display position A is located on the drive lines G6 to G8 and the data lines D8 to D11. At this time, the drive line stray capacitance on the driving line G7 will change, and the changed touch signal Tx3 is generated through the corresponding touch switch 160. The data line stray capacitance on the data line D10 will also change, and the changed touch signal Ty4 is generated through the corresponding touch switch 160. The stray capacitance of the drive lines on the other drive lines G6 and G8, and the stray capacitance of the data lines on the data lines D8, D9, and D11 may also change, but the change may be distinguished from the read values. Come out, so the corresponding touch signals Tx2 and Ty3 will not change much.

Then, the touch detection unit 120 outputs the touch signals sequentially, such as sequentially outputting Tx1, Tx2, Tx3, Tx4, Ty1, Ty2, Ty3, and Ty4. At this time, a large change occurs in the capacitance value on the driving line G7 and the capacitance value on the data line D10. Therefore, the results of differential amplification of the touch signals Tx3 and Ty4 after the differential amplifier 240 are relatively large. Therefore, the touch detection unit 120 generates a position signal Po that is touched by the representative drive line G7 and the data line D10 to the data processing unit 100. Further, it is known which position the liquid crystal display unit 140 is touched, and the touch operation of the liquid crystal display unit 140 is completed.

Therefore, it can be seen from the above that the driving line and the data line of the liquid crystal display are used as the sensor, and the position of the liquid crystal display unit being touched is detected through the in-cell touch circuit device of the present invention. Not only does it need to make another touch panel to increase the weight and volume, but also does not need to change the manufacturing structure of the liquid crystal display to achieve a liquid crystal display with touch function.

The above-mentioned embodiments are merely examples for convenience of description, and the scope of the claims is intended to be limited to the above embodiments.

100. . . Data processing unit

110. . . Display control unit

115. . . Buffer unit

120. . . Touch detection unit

130. . . Timing control unit

140. . . Liquid crystal display unit

150. . . Display switch

156. . . Thin film transistor

157. . . Liquid crystal capacitor

158. . . Holding capacitor

160. . . Touch switch

170. . . Data transmitter

180. . . Gate driver

200. . . Multiplex selector

203. . . Connection pin

205. . . Pin stray capacitance

210. . . Signal source

215. . . Third impedance

220. . . First impedance

225. . . First capacitor

230. . . Second impedance

235. . . Second capacitor

240. . . Differential amplifier

250. . . Rectifier filter circuit

260. . . Integral circuit

270. . . Digital/analog conversion circuit

360. . . Peak detection circuit

Cc. . . Clock signal

Cs. . . Turn-on control signal

Ct. . . Time interval control signal

D1~Dn. . . Data line

G1~Gn. . . Drive line

I1. . . First input

I2. . . Second input

Im. . . video material

Io. . . Output

Po. . . Position signal

Rp. . . Oscillating signal

Sh. . . Display data

St. . . Switching signal

~St. . . Switching signal

Tx1~Txa. . . Horizontal touch signal

Tx1’~Txa’. . . Horizontal touch signal

Ty1~Tya. . . Vertical touch signal

Ty1’~Tya’. . . Vertical touch signal

145. . . Area area

A. . . Display position

1 is a structural diagram of a liquid crystal display having an in-cell touch circuit device according to a preferred embodiment of the present invention.

2 is a structural diagram of a thin film transistor array according to a preferred embodiment of the present invention.

3 is a schematic diagram of a liquid crystal display for display according to a preferred embodiment of the present invention.

4 is a schematic diagram of a touch detection unit in accordance with a preferred embodiment of the present invention.

FIG. 5 is a schematic diagram of a liquid crystal display for touch control according to a preferred embodiment of the present invention.

6 is a schematic diagram of a touch detection unit according to another preferred embodiment of the present invention.

100. . . Data processing unit

110. . . Display control unit

115. . . Buffer unit

120. . . Touch detection unit

130. . . Timing control unit

140. . . Liquid crystal display unit

150. . . Display switch

160. . . Touch switch

170. . . Data transmitter

180. . . Gate driver

Cc. . . Clock signal

Cs. . . Turn-on control signal

Ct. . . Time interval control signal

D1~Dn. . . Data line

G1~Gn. . . Drive line

Im. . . video material

Po. . . Position signal

Sh. . . Display data

St. . . Switching signal

Tx1~Txa. . . Horizontal touch signal

Ty1~Tya. . . Vertical touch signal

145. . . Area area

~St. . . Switching signal

Claims (11)

An in-cell touch circuit device, by touching a liquid crystal display unit, to obtain a pair of position signals corresponding to the position of the liquid crystal display unit in a data processing unit, the touch circuit device comprising: a plurality of driving lines, and each a driving line has a driving line stray capacitance; a plurality of data lines, and the plurality of driving lines are disposed across the liquid crystal display unit, and each data line has a data line stray capacitance; a timing control unit has a touch time interval, and receiving a time control signal generated by the data processing unit to generate a switching signal representing one of the touch time intervals; the plurality of touch switches are driven by every other number of units The line is electrically connected to a driving line, and each of the data lines is electrically connected to a data line, and each touch-open relationship receives the switching signal for the touch time interval, according to the touch time interval. a drive line stray capacitance corresponding to the electrically connected drive line generates a horizontal touch signal, and the data line according to the data line corresponding to the electrical connection A vertical bulk capacitance generated touch signal; and a touch detection unit, receives the level signal and the vertical touch touch signal, thereby generating the position signal to the data processing unit. The in-cell touch circuit device of claim 1, wherein the touch detection unit comprises: a differential amplifier having a first input terminal, a second input terminal, and an output a first impedance, electrically connected to the first input end; a second impedance electrically connected to the second input end; a first capacitor electrically connected to the first input end; a multiplexer, Electrically connecting the plurality of touch switches, and sequentially transmitting the horizontal touch signal and the vertical touch signal to the second input end; and a signal source electrically connecting the first impedance and the second impedance to Providing an oscillating signal to the first impedance and the second impedance; wherein the impedance value of the first impedance is close to the impedance value of the second impedance, and the differential amplifier outputs the output signal according to the oscillating signal The horizontal touch signal and the vertical touch signal after differential amplification. The in-cell touch circuit device of claim 2, wherein the multiplexer is electrically connected to the second input via a connection pin, the connection pin includes a pin The capacitance of the first capacitor is close to the capacitance of the pin stray capacitance and the horizontal touch signal or the parallel touch signal. The in-cell touch control device of claim 3, wherein the touch detection unit further includes a second capacitor electrically connected to the second input terminal, and the capacitance of the first capacitor The value is close to the capacitance of the second capacitor and the stray capacitance of the pin and the horizontal touch signal or the parallel connection with the vertical touch signal. The in-cell touch circuit device of claim 2, wherein the touch detection unit further comprises a rectification filter circuit, an integration circuit, and a digital/analog conversion circuit, the rectification filter circuit Electrically connected to the output of the differential amplifier, the integrating circuit is electrically connected to the rectifying and filtering circuit, and the digital/analog converting circuit is electrically connected to the integrating circuit to generate the position signal to the Data processing unit. The in-cell touch circuit device of claim 2, wherein the touch detection unit further comprises a rectification filter circuit, a peak detection circuit, and a digital/analog conversion circuit, the rectification filter circuit Electrically connected to the output end of the differential amplifier, the peak detecting circuit is electrically connected to the rectifying and filtering circuit, and the digital/analog converting circuit is electrically connected to the peak detecting circuit to generate the position accordingly. Signal to the data processing unit. The in-cell touch control device of claim 2, wherein the touch detection unit further includes a third impedance electrically connected to the signal source and the first impedance and the second impedance between. The in-cell touch circuit device of claim 1, wherein the timing control unit further has a display time interval, and receives the time control signal to generate the switch representing the display time interval accordingly. Signal. The in-cell touch circuit device of claim 8, further comprising: a display control unit that receives a clock signal and an image data generated by the data processing unit to thereby obtain the image data Depositing a buffer unit, and generating a display data and a conduction control signal in the display time interval; a gate driver receiving the conduction control signal to sequentially turn on the plurality of driving lines; and a data The transmitter receives the display data to transmit the display data to the plurality of data lines accordingly. The in-cell touch circuit device of claim 9, further comprising a plurality of display switches, each of the driving lines being electrically connected to the gate driver through the corresponding plurality of display switches, and each A data line is electrically connected to the data transmitter through the corresponding plurality of display switches. The in-cell touch circuit device of claim 8, wherein the display time interval and the touch time interval do not overlap each other.