CN103713433B - Thin film transistor touch display panel device and driving method thereof - Google Patents

Abstract

The invention provides a thin film transistor touch display panel device and a driving method thereof. The plurality of transmission lines are distributed along the first direction. The plurality of receiving lines are distributed along the second direction. Each thin film transistor of the plurality of thin film transistors is located at the intersection of a transmission line and a reception line, and the thin film transistor is connected to the corresponding transmission line, the reception line, and a power supply, so that when there is a touch at the corresponding position of the thin film transistor, the thin film transistor Turning on generates a back channel current. The control unit is connected to a plurality of transmission lines to respectively provide a control signal to the plurality of transmission lines in sequence. The current sensing unit is connected to a plurality of receiving lines to respectively sense currents generated by a plurality of thin film transistors in a sensing time in sequence.

Description

Thin film transistor touch display panel device and driving method thereof

technical field

The present invention relates to the technical field of touch panels, in particular to a thin film transistor touch display panel device and a driving method thereof.

Background technique

The known plug-in touch panel is composed of more than three layers of glass such as thin film transistor liquid crystal display panel (TFTLD) and touch sensor glass (TouchSensorGlass). This design is thicker than the known liquid crystal display panel and does not meet the needs of lightweight products .

At the same time, when the liquid crystal display panel is designed with a touch sensor (TouchSensor), if a transparent conductive layer is used as a touch electrode, the transmittance of the liquid crystal display panel will decrease; if an opaque conductive layer is used, the liquid crystal display will be damaged. The aperture ratio of the panel is reduced.

Contents of the invention

The object of the present invention is to provide a thin film transistor touch display panel device and its driving method, so as to improve the defects in the known technology.

In order to achieve the above purpose, the thin film transistor touch display panel device provided by the present invention includes:

a plurality of transmission lines distributed along the first direction;

A plurality of receiving lines are distributed along a second direction, and the first direction is approximately perpendicular to the second direction;

A plurality of thin film transistors, each of which is located at the intersection of a transmission line and a reception line, wherein each of the thin film transistors is connected to the corresponding transmission line, the reception line, and a power supply, so that the corresponding position of the thin film transistor When there is a touch, the thin film transistor generates a back channel current;

a control unit connected to the plurality of transmission lines to sequentially provide control signals to the plurality of transmission lines; and

A current sensing unit is connected to the plurality of receiving lines to respectively sense the channeled current generated by the thin film transistors at a sensing time in sequence.

In the TFT touch display panel device, the control signal is a signal with a floating potential.

The thin film transistor touch display panel device, which includes:

A plurality of display pixels, each corresponding to a thin film transistor, each display pixel includes a grid scan line, a data line, a switching transistor, and a storage capacitor, the receiving line corresponding to the thin film transistor The data line corresponding to the display pixel is the same line.

In the TFT touch display panel device, each TFT is a switching transistor of a display pixel of the display panel, and its power source is a storage capacitor corresponding to the display pixel.

The thin film transistor touch display panel device includes an upper glass substrate and a lower glass substrate, the plurality of thin film transistors are arranged between the upper glass substrate and the lower glass substrate, and an ITO layer is formed on the upper glass substrate , the ITO layer is respectively opened with holes corresponding to the plurality of thin film transistors.

The driving method of the thin film transistor touch display panel device provided by the present invention, wherein the thin film transistor touch display panel device includes a plurality of transmission lines and a plurality of reception lines distributed approximately perpendicular to each other, a plurality of thin film transistors, each thin film transistor Located at the intersection of a transmission line and a reception line, the thin film transistor is connected to the corresponding transmission line, the reception line and a power supply, the method includes:

providing a current signal to each of the thin film transistors with the power supply;

providing a control signal to the plurality of transmission lines respectively; and

The currents generated by the plurality of thin film transistors are respectively received through the receiving lines at a sensing time.

The method, wherein the control signal is a signal with a floating potential during the sensing time.

Said method, wherein, the control signal has a fixed potential signal, and the fixed potential signal turns into a floating potential during the sensing time.

Said method, wherein the control signal has a pull-up potential signal and a pull-down potential signal, and the sensing time is within the pull-up potential range.

Said method, wherein each thin film transistor is a switch transistor of a display pixel of the display panel, and its power source is a storage capacitor corresponding to the display pixel.

Said method, wherein, the control signal is provided with a pull-up potential signal and a pull-down potential signal during a display frame period of a display line, and the sensing time is before the pull-down potential turns into a pull-up potential.

In the above method, a pre-charge signal is provided before the pull-down potential changes to the pull-up potential, and the sensing time is within the pre-charge signal interval.

Said method, wherein, the pull-up potential is a high gate voltage of the thin film transistor.

The method described above, wherein the TFT touch display panel device includes a drive unit, and when the control signal outputs a floating potential to the TFT, the drive unit outputs a first potential signal to the corresponding receiving line, wherein The first potential signal is a blank time signal.

In the method, the voltage of the first potential signal is fixed.

The method described above, wherein the control signal is sequentially provided with a pull-up potential signal and a pull-down potential signal during a display frame period of N-1 and N display lines, and the sensing time is the Nth display Before the pull-down potential of the line changes to the pull-up potential and after the N-1th display line pull-up potential changes to the pull-down potential, wherein N is a natural number greater than 2.

The method described above, wherein the control signal is sequentially provided with a pull-up potential signal and a pull-down potential signal during a display frame period from the N-1th and Nth display lines to the N+ith display line, the sense The measurement time is before the pull-down potential of the Nth display line to the N+ith display line changes to the pull-up potential and after the pull-up potential of the N-1th display line changes to the pull-down potential.

Effect of the present invention is:

1) The thin film transistor touch display panel device and its driving method provided by the present invention can effectively improve the accuracy of the detected touch position.

2) The thin film transistor touch display panel device and its driving method provided by the present invention can use the thin film transistors on the known liquid crystal display panel for touch sensing without increasing the hardware cost of the known liquid crystal display panel.

3) The thin film transistor touch display panel device and its driving method provided by the present invention can solve the problem that the touch resolution cannot be too high in the prior art.

Description of drawings

FIG. 1 is a schematic diagram of a TFT touch display panel device according to the present invention.

FIG. 2A is a schematic diagram of the operation of a thin film transistor of the present invention.

FIG. 2B is a schematic structural diagram of a thin film transistor of the present invention.

FIG. 3 is a schematic diagram of the use of a thin film transistor of the present invention.

FIG. 4 is a schematic diagram of an embodiment of the thin film transistor of the present invention.

FIG. 5 is a schematic diagram of another embodiment of the thin film transistor of the present invention.

FIG. 6 is a schematic diagram of another embodiment of the thin film transistor of the present invention.

FIG. 7 is a schematic diagram of another embodiment of the thin film transistor of the present invention.

FIG. 8 is a schematic diagram of another embodiment of the thin film transistor of the present invention.

FIG. 9 is a schematic structural diagram of another thin film transistor of the present invention.

FIG. 10 is a flowchart of a driving method of a TFT touch display panel device according to the present invention.

Description of the main components in the accompanying drawings:

TFT touch display panel device 300; transmission line 310; receiving line 320; multiple thin film transistors 330; control unit 340; current sensing unit 350; upper glass substrate 41; lower glass substrate 42; ITO layer 45; hole 46; display Pixel 710; gate scanning line 711; data line 712; switching transistor 713; storage capacitor 714; storage capacitor 810; steps (A)-(C).

detailed description

According to a characteristic of the present invention, the present invention provides a thin film transistor touch display panel device, including a plurality of transmission lines (controlline), a plurality of reception lines (sensorline), a plurality of thin film transistors, a control unit, and a current sensing unit . The plurality of transmission lines are distributed along the first direction. The plurality of receiving lines are distributed along a second direction, and the first direction is substantially perpendicular to the second direction. Each thin film transistor of the plurality of thin film transistors is located at the intersection of a transmission line and a reception line, wherein each of the thin film transistors is connected to a corresponding transmission line, the reception line, and a power supply, so that the corresponding position of the thin film transistor When there is a touch, the thin film transistor generates a back channel current. The control unit is connected to the plurality of transmission lines to provide control signals to the plurality of transmission lines respectively. The current sensing unit is connected to the plurality of receiving lines to respectively sense the channeled current generated by the plurality of thin film transistors at a sensing time in sequence.

According to another characteristic of the present invention, the present invention proposes a method for driving a thin film transistor touch display panel device, wherein the thin film transistor touch display panel device includes a plurality of transmission lines and a plurality of reception lines distributed approximately perpendicular to each other, a plurality of a thin film transistor, each thin film transistor is located at the intersection of a transmission line and a reception line, the thin film transistor is connected to the corresponding transmission line, the reception line, and a power supply, the method first uses the power supply to provide a current signal to each A thin film transistor; providing a control signal to the plurality of transmission lines respectively; finally receiving the current generated by the plurality of thin film transistors through the receiving lines at a sensing time.

The present invention will be described in detail below in conjunction with the accompanying drawings.

FIG. 1 is a schematic diagram of a thin film transistor touch display panel device 300 according to the present invention. The thin film transistor touch display panel device 300 includes a plurality of transmission lines (controlline) 310, a plurality of reception lines (sensorline) 320, and a plurality of thin film transistors 330. , a control unit 340, a current sensing unit 350, and a driving unit (not shown).

The plurality of transmission lines (controllines) 310 are distributed along a first direction (X direction).

The plurality of sensor lines 320 are distributed along a second direction (Y direction), and the first direction is substantially perpendicular to the second direction.

Each thin film transistor 330 in the plurality of thin film transistors 330 is located at the intersection 320 of a transmission line (controlline) 310 and a reception line (sensorline), wherein the thin film transistor has a gate G connected to the corresponding transmission line (controlline) 310. A first source/drain S/D is connected to the corresponding receiving line (sensorline) 320, and a second source/drain S/D is connected to a power supply 331. When there is a touch at the corresponding position of the gate G , the thin film transistor 330 is turned on to generate current in the first source/drain S/D. The control unit 340 sequentially sends signals to the transmission line 310 to turn on the thin film transistor 330. Due to the voltage difference between the power supply 331 and the receiving line 320, a current is generated in the channel layer. When the corresponding position of the thin film transistor 330 is touched, the back The channel (backchannel) effect generates a back channel current, which changes the current flowing through the channel layer. Wherein, the power supply 331 provides a DC signal or an AC signal. The DC signal can be a fixed voltage, such as 5V or 0V.

The control unit 340 is connected to the plurality of transmission lines (controllines) 310 to respectively provide control signals to the plurality of transmission lines (controllines) in sequence.

The current sensing unit 350 is connected to the plurality of receiving lines (sensorlines) 320 to respectively sense the currents generated by the plurality of thin film transistors 330 in the first source/drain S/D in sequence with the sensing time.

2A is a schematic diagram of the operation of a thin film transistor 330 of the present invention, and FIG. 2B is a schematic structural diagram of a thin film transistor 330 of the present invention, which shows that the thin film transistor 330 of the present invention is disposed between an upper glass substrate 41 and a lower glass substrate 42. As shown in FIG. 2A , the power supply 331 is a fixed voltage of 0V. When the transmission line 310 is fed with a signal to turn on the thin film transistor, the voltage difference between the power source 331 and the receiving line 320 causes a current to flow in the channel layer. The current of the layer changes, the current sensing unit 350 senses the current through the corresponding sensor line 320 , and the control unit 340 can judge whether there is a finger approaching the thin film transistor 330 according to the magnitude of the current.

The difference in current is because the thin film transistor 330 is in the sub-threshold region, because the current Id flowing through the drain and source is very seriously affected by the gate potential, so when the finger touches, it will cause There is an obvious difference in the current Id, and the present invention utilizes this phenomenon to judge whether there is a touch. That is, when a finger touches the position corresponding to the thin film transistor 330, the threshold voltage (Vt) of the thin film transistor 330 is changed through the effect of the back channel, thus causing a difference in the current Id flowing through the drain and the source. .

FIG. 3 is a schematic diagram of the use of a thin film transistor 330 of the present invention. The control unit 340 provides control signals to a control line 310 . Wherein, the control signal has a fixed potential signal, and the fixed potential signal turns into a floating potential at the sensing time. That is, during the sensing time, the control signal is a signal with a floating potential.

As shown in Figure 3, in case 1 of transmitting online signals, the signal with floating potential is a fixed potential V1 and periodically turns to floating potential at fixed potential V1; or in case 2 of transmitting online signals , the signal with a floating potential is the pull-down potential V1 and periodically turns to a floating potential after being pulled up to the pull-up potential V2; or in case 3 of the signal transmitted on the line, the signal with a floating potential is a pull-down potential V1 is periodically pulled up to the pull-up potential V2 and fixed at the pull-up potential V2, and then pulled down to the pull-down potential V1. For example, the pull-down potential V1 is -7V, and the pull-up potential V2 is 0V.

As shown in Figure 3, at the sensing time, in case 1 of the signal on the receiving line (sensorline), the receiving line is floating; or in case 2 of the signal on the receiving line (sensorline), the receiving line is a fixed potential.

A control line 310 can be connected to a single or a plurality of thin film transistors 330 . The power supply 331 is a signal source, including DC or AC signals.

FIG. 4 is a schematic diagram of an embodiment of the thin film transistor of the present invention. As shown in FIG. 4 , the thin film transistor 330 coexists with the switch transistor 713 of a display pixel 710 of a display panel, and its power source is the storage capacitor 714 corresponding to the display pixel. The display pixel 710 is composed of a gate scanning line 711, a data line 712, a switch transistor 713, and a storage capacitor 714, which is a general liquid crystal display pixel 710, and will not be described again. Wherein, in this embodiment, the receiving line (sensorline) 320 and the data line 712 of the liquid crystal display pixel 710 are the same line.

As shown in FIG. 4 , at time T1 , image display of frame n−1 is performed, and at time T2 , touch sensing is performed. Therefore, in time T1, when a certain display line is to be displayed, the corresponding gate scanning line 711 will be pulled up from the pull-down potential V1 to a pull-up potential signal V3, so that the data line 712 will write the display pixel data into the corresponding The storage capacitor 714 (charging). Afterwards, the corresponding gate scanning line 711 is pulled down to the pull-down potential V1 by the pull-up potential signal V3, so that the corresponding storage capacitor 714 holds the written display pixel data (hold). For example, the pull-up potential signal V3 is Vgh. Wherein, the pull-up potential V3 is the high gate voltage (Vgh) of the thin film transistor, and Vgh is set between 15V-33V in current products.

As shown in FIG. 4 , the control signal has a pull-up potential signal and a pull-down potential signal, and the sensing time is within the pull-up potential range. That is, between frame n−1 and frame n, there is a period of time ( T2 ) which is a display blanking time (blanking), and the present invention utilizes this period of time for touch sensing. The control signal provided by the control unit 340 to the plurality of transmission lines 310 is a floating signal. At time T2, the signal with a floating potential on the transmission line 310 is a pull-down potential V1 during a display frame period (time T2 of frame n-1), and turns into a floating potential (floating) when the pull-down potential V1 And turn to pull-down potential V1. Or the signal with a floating potential is a pull-down potential V1 during a display frame period (time T2 of frame n-1), pulled up to a pull-up potential V2, and turned into a floating potential (floating) when the pull-up potential V2 , turn to pull-up potential V2 when floating potential, and return to pull-down potential V1.

In this embodiment, the touch sensing is performed using the data blanking time when the frame is displayed. In this embodiment, a plurality of transmission lines 310 (for example, 5) can be activated simultaneously during the touch sensing time, so as to meet the demand of the current sensing unit to detect the magnitude of the current without affecting the display screen.

FIG. 5 is a schematic diagram of another embodiment of the thin film transistor of the present invention. As shown in FIG. 5 , each thin film transistor 330 is a switching transistor of a display pixel of the display panel, and its power source is the storage capacitor 810 corresponding to the display pixel. The receiving line (sensorline) 320 is the same line as the data line of the LCD pixel. The transmission line (controlline) 310 is the same line as the gate scanning line of the LCD pixel.

As shown in FIG. 5 , at time T1 , image display of line k−1 is performed, and at time T2 , touch sensing is performed. Between the line k−1 and the line k, there is a period of time (T2) for display blanking, and the present invention utilizes this period of time for touch sensing.

The control signal provided by the control unit 340 to the plurality of transmission lines 310 is a floating signal. The signal with a floating potential is a pull-up signal V3 during a display line period (time T1 of line k−1), so as to write display pixel data into the corresponding storage capacitor 810 (charging) through the receiving line (sensor line) 320 . After that, the corresponding transmission line (controlline) 310 is pulled down from the pull-up signal V3 to the pull-down signal V2, so as to keep the written display pixel data by the corresponding storage capacitor 810, and maintain the pull-down signal V2 (hold), during the period of the display line ( The time T2) of the line k-1 changes from the pull-down signal V2 to the floating potential (floating).

Or the signal with a floating potential is a pull-up signal V3 during a display frame period (time T1 of line k−1) to charge the storage capacitor to display pixels. Then, the signal is pulled down to the pull-down signal V2, and the pull-down signal V2 is maintained to keep the written display pixel data (hold). At time T2, the signal is pulled up to the pre-charge signal V1 and turned into a floating potential (floating) when the pre-charge signal V1 is turned, and then when switching to the next display frame, the floating potential turns into the pre-charge signal V1, and Pull up to pull-up signal V3. Wherein, the pull-up signal V3 is a high gate voltage (Vgh) of the thin film transistor.

As shown in Figure 5, at time T1, a driving unit (not shown in the figure) outputs a potential signal Vp(+) to the corresponding receiving line (sensorline), and the potential signal Vp(+) is the corresponding The corresponding voltage of the pixel data of the pixel. At time T2, that is, when the signal with the floating potential is at the floating potential, the control unit 340 outputs the first potential signal Vdata_blank to the corresponding receiving line (sensorline), wherein the first potential signal is a blank time (Vdata_blank) signal

Wherein, the relationship between the potential signal Vp(+) and the first potential signal Vdata_blank is:

Vp(+)-Vdata_blank=Vds,

Among them, Vds is a default voltage.

The present invention firstly measures whether the thin film transistor 330 is under different source and drain voltages (Vds), whether or not the finger touches the thin film transistor 330, and when the difference of the current Id flowing through the drain and source is the largest, the corresponding Record the source and drain voltage (Vds) of , as the default voltage Vds. As shown in FIG. 5, when touch sensing is to be performed on the kth line of the nth frame, the storage capacitor 810 holds the display pixels of the kth line of the previous frame (n-1th frame). The voltage of the data, that is, the potential signal Vp(+), at this time at time T2, a driving unit outputs the first potential signal Vdata_blank to the corresponding receiving line (sensorline) 320, so the voltage of the source and drain of the thin film transistor 330 is The default voltage Vds, therefore, the difference between the current flowing through the source and the drain of the thin film transistor 330 will be the largest when there is no finger touch. This can make it easy for the current sensing unit 350 to determine whether there is a finger touch.

FIG. 6 is a schematic diagram of another embodiment of the thin film transistor of the present invention. The main difference between it and FIG. 5 is that the present invention first measures the data of the current Id flowing through the drain and source when the thin film transistor 330 is under different operating clamping voltages Vt, whether or not the finger touches the thin film transistor 330, and Make a table of operating clamping voltage Vt and current.

When touch sensing is to be performed on the k-th line of the n-th frame, the storage capacitor 810 maintains the voltage of the display pixel data of the k-th line of the previous frame (n-1th frame), that is, the potential signal Vp(+), at time T2, the driving unit IC outputs the first potential signal Vs to the corresponding receiving line (sensorline) 320, so the voltage of the source and drain of the thin film transistor 330 is the operating voltage Vt , wherein the voltage of the first potential signal Vs is fixed. Therefore, at time T2, the relationship between the potential signal Vp(+) and the first potential signal Vs is:

Vp(+)-Vs=Vt.

When there is no finger touch, the current sensing unit 350 senses the current Id, and then presses Vt by the current Id and operation, and the control unit 340 can judge whether there is a finger touch from the table.

7 is a schematic diagram of another embodiment of the thin film transistor of the present invention. The control signal sequentially provides a pull-up potential signal and a pull-down potential signal during a display frame of the N-1 and N display lines. The measurement time is before the pull-down potential of the Nth display line changes to the pull-up potential and after the pull-up potential of the N-1 display line changes to the pull-down potential, wherein N is a natural number greater than 2. As shown in FIG. 7, at the time Tdc, the signal with floating potential corresponding to the N-2th display line is a pull-up signal V3 during an N-2th display line, charging the storage capacitor to display pixels, And at time Ttc, pull down to the pull-down signal V2. At this time, the storage capacitor of a pixel of the N-2th display line is charged. N is an index value, which is a natural number greater than 2.

At time Ttc, the signal with floating potential corresponding to the N-2th display line is the pull-down signal V2, and the signal with the floating potential corresponding to the Nth display line is pulled up to the pull-up signal V3. That is, between the line N-2 and the line N-1, there is a period of time (Ttc) for display blanking (blanking), and the present invention uses this period of time to write the default voltage Vd via the receiving line (sensorline) 320, to charge the storage capacitor to the voltage Vd. The storage capacitor corresponds to the thin film transistor 330 on the Nth display line. That is, at the time Tdc, the storage capacitor of a pixel of the N-2th display line is charged to display an image, and at the time Ttc, the storage capacitor of a pixel of the Nth display line is charged to prepare for touch sensation. Measurement.

At time Ta, the signal with floating potential corresponding to the N-1th display line is a pull-up signal V3 during an N-1th display line to charge the storage capacitor of a pixel of the N-1th display line , for image display, at time Ts, pull down to the pull-down signal V2. At time Ts, when the floating potential corresponding to the N-1th display line is the pull-down signal V2, the floating potential signal corresponding to the Nth display line changes to a floating potential for touch sensing. At the time Ts, the touch sensing is performed, at this time, the receiving line (sensorline) 320 is fixed at the first potential signal Vs, and at the same time, the gate of the thin film transistor 330 is maintained at a floating potential.

At time Tdc2, the signal with floating potential corresponding to the Nth display line is the pull-up signal V3 to charge the storage capacitor of the Nth display line to display the pixels of the Nth display line. At this point, the foregoing steps are already being repeated, so details are not repeated here. It should be noted that after the time Ttc and between the time Tdc2, since the storage capacitor of the Nth display line is defaulted to the voltage Vd, the image of the Nth display line cannot be displayed correctly. However, this period of time is very short, and the eyes of ordinary users cannot detect it, so generally speaking, the user can still correctly watch the images displayed on the LCD screen. After the time Tdc2, the Nth display line can correctly display the image of the Nth display line again.

Fig. 8 is a schematic diagram of another embodiment of the thin film transistor of the present invention, the control signal is sequentially provided with a pull-up potential signal during a display frame period of the N-1th and Nth display lines to the N+ith display line With a pull-down potential signal, the sensing time is before the pull-down potential of the Nth display line to the N+ith display line changes to the pull-up potential and after the pull-up potential of the N-1th display line changes to the pull-down potential. As shown in FIG. 8, at the time Tdc, the signal with floating potential corresponding to the N-2th display line is a pull-up potential V3 during an N-2th display line to charge the storage capacitor to display pixels , and pull down to the pull-down potential V2 at time Ttc. At this time, the storage capacitor of a pixel of the N-2th display line is charged.

At time Ttc, when the floating potential corresponding to the N-2th display line is the pull-down potential V2, the signal with the floating potential corresponding to the Nth display line to the N+ith display line is pulled up to the pull-up potential V3 . That is, between the line N-2 and the line N-1, there is a period of time (Ttc) for display blanking (blanking), and the present invention uses this period of time to write the default voltage Vd via the receiving line (sensorline) 320, to charge the storage capacitor to the voltage Vd. The storage capacitor corresponds to the thin film transistors 330 on the N th display line to the N+i th display line. Wherein i is an index value, which is a natural number greater than 1. That is, at the time Tdc, the storage capacitor of a pixel of the N-2th display line is charged for image display, and at the time Ttc, the storage capacitor of a pixel of the Nth display line to the N+ith display line is charged , to prepare for touch sensing.

At time Tta, the signal with a floating potential corresponding to the N-1th display line is a pull-up potential V3 during an N-1th display line, so as to charge a storage capacitor of a pixel of the N-1th display line , for image display, at the time Ts, pull down to the pull-down potential V2. At time Ts, when the floating potential corresponding to the N-1th display line is the pull-down potential V2, the signal with the floating potential corresponding to the Nth display line to the N+ith display line turns into a floating potential, for touch sensing. At the time Ts, the touch sensing is performed, at this time, the receiving line (sensorline) 320 is fixed at the first potential signal Vs, and at the same time, the gate of the thin film transistor 330 is maintained at a floating potential. (Embodiment6-1, original)

In the embodiment of FIG. 8 , the number of receiving lines (sensorlines) 320 is extended to i+1, so more current can be generated during touch sensing than in FIG. 7 . At the time Ttc, the potential of the storage capacitor is reset (or charged to the voltage Vd), at the time Ts, the touch sensing (current detection) is performed, and at the time Tdc, the writing of the display signal is completed.

When the technology of the present invention is applied to an InPanel Switching (IPS) panel, as shown in FIG. 9 , an ITO layer 45 will be formed on the upper glass substrate 41 to protect the electric field driving the liquid crystal established inside the panel from being disturbed. Therefore, the ITO layer 45 is respectively opened with holes 46 corresponding to the plurality of thin film transistors 330 to expose the thin film transistors 330 of the present invention to sense the touch of the finger. In addition, the ITO layer (for example: the common electrode) of the glass substrate under the IPS panel may also have holes corresponding to the thin film transistors 330).

FIG. 10 is a flowchart of a driving method of a thin film transistor touch display panel device according to the present invention, referring to the thin film transistor touch display panel device shown in the preceding drawings, wherein the thin film transistor touch display panel device includes A plurality of transmission lines 310, a plurality of reception lines (sensorline) 320, and a plurality of thin film transistors 330 distributed approximately vertically, each thin film transistor 330 is located at the intersection of a transmission line 310 and a reception line (sensorline) 320, and the thin film transistor 330 has A gate G is connected to a corresponding transmission line, a first source/drain S/D is connected to a corresponding sensor line, and a second source/drain S/D is connected to a power supply 331 . In the method, the power supply 331 provides a current signal to the second source/drain S/D of each thin film transistor 330 in step (A).

In step (B), provide a control signal to the plurality of transmission lines 310 respectively.

In step (C), the currents generated by the plurality of thin film transistors are respectively received through the receiving lines at a sensing time.

It can be seen from the foregoing description that the technology of the present invention can utilize the thin film transistors on the conventional liquid crystal display panel for touch sensing without increasing the hardware cost of the conventional liquid crystal display panel. The technology of the present invention can also coexist the thin film transistor 330 with the thin film transistor on the conventional liquid crystal display panel to perform touch sensing. No matter what it is, it can effectively improve the accuracy of the detected touch position. It can also solve the problem that the touch resolution cannot be too high in the known technology.

From the above, it can be known that the present invention, regardless of its purpose, means and efficacy, shows its characteristics that are quite different from the known technologies, and it is of great practical value. However, it should be noted that the above-mentioned embodiments are only examples for the convenience of description, and the scope of rights claimed by the present invention should be determined by the scope of claims in the application, rather than limited to the above-mentioned embodiments.

Claims (9)

1. A driving method for a thin film transistor touch display panel device, wherein the thin film transistor touch display panel device comprises a plurality of transmission lines and a plurality of reception lines distributed approximately perpendicular to each other, a plurality of thin film transistors, each thin film transistor Located at the intersection of a transmission line and a reception line, the thin film transistor is connected to the corresponding transmission line, the reception line and a power supply, the method includes: providing a current signal to each of the thin film transistors with the power supply; providing a control signal to the plurality of transmission lines respectively; and Receiving currents generated by the plurality of thin film transistors through the receiving lines at a sensing time; Wherein, the control signal is a signal with a floating potential at the sensing time, each of the thin film transistors is a switching transistor of a display pixel of the display panel, and its power supply is a storage capacitor corresponding to the display pixel, and the control signal A pull-up potential signal and a pull-down potential signal are provided during a display frame period of a display line, and the sensing time is before the pull-down potential turns into a pull-up potential. 2. The method according to claim 1, wherein the control signal has a fixed potential signal, and the fixed potential signal is changed to a floating potential at the sensing time. 3. The method according to claim 1, wherein the control signal has a pull-up potential signal and a pull-down potential signal, and the sensing time is within the pull-up potential range. 4. The method according to claim 1, wherein a precharge signal is provided before the pull-down potential changes to the pull-up potential, and the sensing time is within the precharge signal interval. 5. The method according to claim 1, wherein the pull-up potential is a high gate voltage of a thin film transistor. 6. The method according to claim 1, wherein the thin film transistor touch display panel device comprises a driving unit, and when the control signal outputs a floating potential to the thin film transistor, the driving unit outputs a first potential signal to the corresponding The receiving line, wherein the first potential signal is a blank time signal. 7. The method according to claim 6, wherein the voltage of the first potential signal is fixed. 8. A method for driving a thin film transistor touch display panel device, wherein the thin film transistor touch display panel device includes a plurality of transmission lines and a plurality of reception lines distributed approximately perpendicular to each other, a plurality of thin film transistors, each thin film transistor Located at the intersection of a transmission line and a reception line, the thin film transistor is connected to the corresponding transmission line, the reception line and a power supply, the method includes: using the power supply to provide a current signal to each of the thin film transistors; providing a control signal to the plurality of transmission lines respectively; and Receiving currents generated by the plurality of thin film transistors through the receiving lines at a sensing time; Wherein, the control signal is a signal with a floating potential at the sensing time, each of the thin film transistors is a switching transistor of a display pixel of the display panel, and its power supply is a storage capacitor corresponding to the display pixel, and the control signal is Provide a pull-up potential signal and a pull-down potential signal during a display frame of the N-1th and Nth display lines in sequence, and the sensing time is before the pull-down potential of the Nth display line turns into a pull-up potential and before The N-1 line shows that the pull-up potential of the line is changed to a pull-down potential, where N is a natural number greater than 2. 9. A method for driving a thin film transistor touch display panel device, wherein the thin film transistor touch display panel device includes a plurality of transmission lines and a plurality of reception lines distributed approximately perpendicular to each other, a plurality of thin film transistors, each thin film transistor Located at the intersection of a transmission line and a reception line, the thin film transistor is connected to the corresponding transmission line, the reception line and a power supply, the method includes: using the power supply to provide a current signal to each of the thin film transistors; providing a control signal to the plurality of transmission lines respectively; and Receiving currents generated by the plurality of thin film transistors through the receiving lines at a sensing time; Wherein, the control signal is a signal with a floating potential at the sensing time, each of the thin film transistors is a switching transistor of a display pixel of the display panel, and its power supply is a storage capacitor corresponding to the display pixel, and the control signal is Provide a pull-up potential signal and a pull-down potential signal during a display frame period from the N-1 and Nth display lines to the N+ith display line in sequence, and the sensing time is from the Nth display line to the Nth display line +i shows before the pull-down potential of the line turns into a pull-up potential and after the N-1th line shows that the pull-up potential turns into a pull-down potential, where N is a natural number greater than 2, and i is a natural number greater than 1.