KR102194028B1 - Touch Display Device And Method Of Driving The Same - Google Patents

Abstract

The present invention has an effect of improving touch sensing capability by having a plurality of touch sections within one frame.
By setting the display driver IC to a stop state when driving a touch, abnormal operation can be prevented and noise can be suppressed.

Description

Touch Display Device And Method Of Driving The Same}

The present invention relates to a touch display device, and more particularly, to an in-cell touch type display device capable of improving touch sensing performance and a driving method thereof.

In line with the information age, the display field has also developed rapidly, and in response to this, a liquid crystal display device (LCD) as a flat panel display device (FPD) with advantages of thinner, lighter, and low power consumption. ), a plasma display panel device (PDP), an organic light emitting diode display device (OLED), and a field emission display device (FED) are being developed.

Recently, a touch screen, which is a display device in which a touch panel is attached to such a display panel, has been in the spotlight.

The touch screen is used as an output means for displaying an image and at the same time as an input means for inputting a user's command by touching a specific part of the displayed image.The touch panel is a decompression method or a capacitive method according to the location information detection method. , Infrared method, ultrasonic method, etc.

That is, when the user touches the touch panel while watching the image displayed on the display panel, the touch panel detects the location information of the corresponding touch area and compares the detected location information with the location information of the image to recognize the user's command. .

Such a touch screen may be manufactured in a form in which a separate touch panel is attached to the display panel or a touch panel is formed on a substrate of the display panel and integrated.

1 is a diagram showing a method of driving a touch display device in the prior art. In this case, the touch display device is an in-cell touch type display device in which a touch panel is formed on a substrate of a display panel.

Referring to FIG. 1, in a conventional touch display device, display driving and touch driving are performed together, in which case a time division driving method is applied. That is, during a partial period of one frame, a display section displaying an image and a touch section performing touch driving during the remainder of the frame are made.

As described above, in the conventional touch display device, it is difficult to increase the touch sensing capability because the touch drive is limited once during one frame.

Accordingly, in order to increase the touch sensing capability, it must be driven by increasing the driving frequency of the touch display device to improve the touch sensing capability by the time division driving method.

However, if the driving frequency of the touch display device is increased, the number of touch drives may increase, but it is difficult to control the time used for the touch section as the time used for the display section increases. For example, when the touch display device operates at a frequency of 120 [Hz], image data transmitted in one second is twice as much as that of 60 [Hz], and the time spent for touch driving is inevitably reduced.

That is, in the conventional method of driving a touch display device, it is difficult to increase the touch sensing capability.

An object of the present invention is to solve the above problems, and an object thereof is to improve a touch sensing capability regardless of a driving frequency of a touch display device.

In order to achieve the object as described above, the present invention includes a panel including m driving electrodes and m wirings (m is a natural number) and divided into a display area and a non-display area; A display driver IC for applying a common voltage, a reset signal, a start voltage, and a touch signal to the m driving electrodes through the m wires; And a touch IC that generates the touch signal and applies it to the display driver IC, wherein the display driver IC includes a shift resist unit that generates a scan signal, and the shift register unit includes a plurality of stages, and the k-th stage ( k is a natural number), the output of the (k-1)th stage is input to the start terminal, the output of the (k+1)th stage is input to the reset terminal, and the nth stage (n≠k, n is a natural number) Provides a touch display device, characterized in that a first reset signal different from the output of the (n+1)th stage is input to the reset terminal.

The first stage receives a first start voltage from the display driver IC to a start terminal, and the (n+1) stage receives a second start voltage different from the output of the nth stage to the start terminal, The stage is characterized in that the second reset signal is input to the reset terminal.

It is a first display section in which the panel displays an image until the first start voltage is input and the first reset voltage is input, and the touch area is touched until the first reset voltage is input and the second start voltage is input. This is a first touch section for detecting the location information of, and is a second display section in which the panel displays an image before the second start voltage is input and the second reset voltage is input, and the second reset voltage is input. And, before the first start voltage is input, it is a second touch section for detecting location information of the touched part.

In the present invention having the above-described characteristics, during the first display period, the first to nth stages of the shift register unit (n is a natural number) sequentially generate the first to nth scan signals and transmit them to the first to nth gate lines. And transmitting a plurality of data signals to a plurality of data lines to display an image; Transmitting a touch driving signal to a plurality of touch electrodes during a touch period and receiving a touch sensing signal from the touch electrodes to detect location information of a touch area; During the second display period, (n+1) to 2nth scan signals are sequentially generated in the (n+1) to 2nth stages of the shift resist unit and transferred to the (n+1) to 2nth gate lines And transmitting a data signal to the plurality of data lines to display an image, wherein the kth stage (k<2n, k≠n) is the (k-1)th scan of the (k-1)th stage A signal is input to the start terminal, the (k+1)th scan signal of the (k+1)th stage is inputted to the reset terminal, and the nth stage is the (n+1)th stage. 1) It provides a method of driving a touch display device, characterized in that a reset signal different from the scan signal is inputted to a reset terminal.

The first display section includes the step of inputting a first start voltage from a display driver IC to a start terminal of the first stage, and the touch section includes the reset signal different from the (n+1)th scan signal. And inputting a second start voltage different from the nth scan signal to a start terminal of the (n+1)th stage in the second display section. .

The touch section is set according to the number of times the reset signal is input during one frame, and the number of times the reset signal is input is more than once during one frame.

As described above, the present invention has an effect of improving touch sensing capability by having a plurality of touch sections within one frame.

By setting the display driver IC to a stop state when driving a touch, abnormal operation can be prevented and noise can be suppressed.

1 is a diagram illustrating a method of driving a conventional touch display device.
2 is a schematic diagram of a touch display device according to an exemplary embodiment of the present invention.
3 is a diagram schematically illustrating a configuration of a touch display device according to an embodiment of the present invention.
4 is a timing diagram illustrating a method of driving the touch display device of FIG. 3.
5 is a diagram schematically illustrating a configuration of a touch display device according to another exemplary embodiment of the present invention.
6 is a timing diagram illustrating a method of driving the touch display device of FIG. 5.

Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Meanwhile, hereinafter, for convenience of explanation, the touch display device according to various embodiments of the present invention is described as an example as a liquid crystal display device, but the present invention is not limited thereto, and the field emission display device, plasma display panel, electroluminescence display It can be applied to various display devices such as devices, electrophoretic displays, and organic light emitting diodes. In addition, a description of the general configuration of the liquid crystal display device will be omitted.

2 is a diagram illustrating a configuration of a touch display device according to an embodiment of the present invention.

As shown in FIG. 2, a touch display device according to an embodiment of the present invention includes a panel 100, a display driver IC 200, and a touch IC 300.

First, the panel 100 is divided into a display area 110 and a non-display area 120, where a touch panel (not shown) is embedded in the display area 110, and the display area 120 is The driver IC 200 is built-in.

Here, the touch panel performs a function of detecting the user's touch position. In particular, the touch panel applied to the present invention divides a common electrode and uses it as a direct touch electrode to prevent a static electricity between the touch electrode and the user's input. This is a self-capacitive touch panel that operates in a way of recognizing a touch by measuring a change in capacitance generated when a user inputs a touch by forming a capacitance. The panel 100 described below will be described as being a panel 100 in which the above-described display panel and touch panel are integrated.

The panel 100 according to an embodiment of the present invention may be configured in a form in which a liquid crystal layer is formed between two substrates. In this case, the lower substrate of the panel 100 includes a plurality of gate lines, a plurality of data lines crossing the gate line, a plurality of TFTs (Thin Film Transistor) formed at the intersections of the data line and the gate line, and the data line. Pixels are arranged in a matrix form by the crossing structure of the gate lines.

The panel 100 described above includes m driving electrodes 111 in the display area, and the m driving electrodes 111 are common electrodes for driving liquid crystal together with pixel electrodes formed in each pixel during the display driving period. And operates as a touch electrode that senses a touch position by a touch scan signal applied from the touch IC 300 during the touch driving period.

The panel 100 according to an embodiment of the present invention includes m wirings 112, and the m wirings 112 connect m driving electrodes 111 and the display driver IC 200, The common voltage and the touch scan signal output from the display driver IC 200 are applied to the m driving electrodes 111 through the respective wirings 112. In addition, the touch detection signal received from the m driving electrodes 111 is transmitted to the display driver IC 200 according to the touch scan signal.

The above-described touch scan signal is a signal generated by the touch IC 300 and applied to the m driving electrodes 111 through the display driver IC 200, and the touch detection signal is applied to the user's touch input according to the touch scan signal. This signal is generated between the m driving electrodes 111 and is finally transmitted to the touch IC 300 through the display driver IC 200.

Next, the display driver IC 200 applies a common voltage or a touch scan signal to the m driving electrodes 111 through m wirings 112 according to the driving mode of the panel 100.

In other words, when the driving mode of the panel 100 is the display driving mode, the display driver IC 200 applies a common voltage to the m driving electrodes 111 through m wires 112 so that the panel 100 When the display is driven and the driving mode of the panel 100 is the touch driving mode, the display driver IC 200 applies a touch scan signal to the m driving electrodes 111 through m wires 112 (100) makes the touch drive.

Although not shown in the drawings of the present invention, the above-described display driver IC 200 includes a common voltage generator, a synchronization signal generator, and a switching unit.

The common voltage generator generates a common voltage Vcom and applies it to the switching unit. In other words, when the driving mode of the panel 100 is the display driving mode, a common voltage to be applied to the m driving electrodes 111 for image output is generated and applied to the switching unit.

The synchronization signal generator generates a synchronization signal indicating the display driving mode and the touch driving mode.

For example, according to the display driving mode and the touch driving mode, the common voltage Vcom generated by the common voltage generating unit is applied to the m driving electrodes 111 through the switching unit, or generated by the touch IC 300. A synchronization signal instructing that the touch scan signal is applied to the m driving electrodes 111 is generated.

The switching unit connects the common voltage generator and m driving electrodes 111 to each other or connects the touch IC 300 and m driving electrodes 111 according to the synchronization signal.

In addition, the display driver IC 200 may further include a multiplexer for dividing the m driving electrodes 111 into groups and applying a touch scan signal to each of the divided groups.

Using the above-described multiplexer, the display driver IC 200 may divide the m number of driving electrodes 111 in the panel 100 into a plurality of groups during the touch driving mode to sequentially apply a touch scan signal for each group.

For example, when m driving electrodes 111 of the panel 100 are divided into two groups, the display driver IC 200 is common to all electrodes 111 of the panel 100 during the display driving mode. A voltage may be applied and a touch scan signal may be sequentially applied to the first group and the second group during the touch driving mode.

Finally, the touch IC 300 generates a touch scan signal and applies the touch scan signal to the m driving electrodes 111 through the display driver IC 200, and then a touch detection signal according to the applied touch scan signal. Receiving is performed a function of detecting a touch input position in the panel 100.

For example, the touch IC 300 according to an embodiment of the present invention generates a touch scan signal generating unit (not shown) that generates a touch scan signal to be supplied to the m driving electrodes 111 of the panel 100 for touch sensing. Poem). The touch scan signal may be a touch driving voltage, and the touch driving voltage may have a value greater than a common voltage applied to the m driving electrodes 111 of the panel 100 for driving the display. In this case, the touch driving voltage may have a voltage corresponding to the common voltage as a low-level voltage and a higher voltage as a high-level voltage.

The touch scan signal generator is connected to the m driving electrodes 111 through a switching unit (not shown) in the display driver IC 200.

In addition, the touch IC 300 detects a change in capacitance generated between the user's touch input and the driving electrode according to a touch scan signal from the m driving electrodes 111 in the panel 100 to detect the touch input position by the user. It may include a touch sensing unit (not shown) that performs a function of sensing. A change in sensed capacitance, that is, a touch detection signal, is transmitted to a system unit (not shown) of the display device so that the user's touch coordinates generated in the panel 100 are displayed on the display area of the panel 100.

The touch sensing unit is connected to the m driving electrodes 111 through a switching unit in the display driver IC 200.

Hereinafter, a description of the display driver IC among the constituent elements of the present invention mentioned above, and the core idea of the present invention for improving touch sensing capability will be described in detail.

3 is a diagram schematically illustrating a configuration of a touch display device according to an embodiment of the present invention.

As shown, the touch display device includes a panel 100 and a display driver IC 200.

As described above, the panel 100 includes a plurality of data lines DL1 to DLm crossing a plurality of gate lines GL1 to GL(2n), data lines DL1 to DLm, and gate lines GL1 to GL. It includes a plurality of pixels P formed at intersections of (2n+1)).

When the driving mode of the panel 100 is the display driving mode, the display driver IC 200 operates the pixel P by applying scan signals to a plurality of gate lines GL1 to GL(2n+1), If the driving mode of 100) is the touch touch driving mode, the scan signal applied to the plurality of gate lines GL1 to GL(2n+1) is not applied.

In more detail, the display driver IC 200 includes a shift register unit 140.

The shift register unit 140 is shifted by a predetermined phase difference, and gate shift clocks swinging between the gate high voltage and the gate low voltage are input. In this case, as the gate shift clock, a three-phase or three-phase or more gate shift clock may be used.

In addition, a gate high voltage and a gate low voltage are supplied to the shift register unit 140. The gate high voltage can be set to about 20V, and the gate low voltage can be set to about -5V.

The shift register unit 140 includes a plurality of stages (STG1 to STG(2n)) that are dependently connected.

Each of the plurality of stages STG1 to STG(2n+1) separates and outputs a scan signal (or gate signal). Stage 1 (STG1), Stage 2 (STG2),… , (N-1)th stage (STG(n-1)), (n)th stage (STG(n)), (n+1)th stage (STG(n+1)), ... , Outputs are sequentially generated in the order of (2n)th stage (STG(2n)).

A start voltage is input to the start terminal (S) of the first stage (STG1), and the second scan signal of the second stage (STG2) is input to the reset terminal (R) of the first stage (STG1). Although not shown, different gate clock pulses (not shown) are input to the gate clock terminals (not shown) of each stage.

Accordingly, the first stage STG1 outputs a first scan signal having a pulse width of one horizontal period. In addition, the output first scan signal of the first stage STG1 is input to the start terminal S of the second stage STG2. Also, a gate clock pulse different from the gate clock pulse is input to the gate clock terminal of the second stage STG2. Accordingly, the second stage STG2 outputs a second scan signal Scan2 having a pulse width of one horizontal period coinciding with a section in which the first scan signal Scan1 is logic low.

As described above, the plurality of stages STG1 to STG(2n) sequentially output scan signals in a dependent relationship.

At this time, the (n+1)th scan signal of the next stage (n+1)th stage (STG(n+1)) is transmitted to the reset terminal R of the (n)th stage STG(n). The first reset signal Reset_1 is not inputted as a reset signal, but through a separate first reset line.

In addition, the nth scan signal of the preceding nth stage STG(n) is not input as a start voltage to the start terminal S of the (n+1)th stage STG(n+1). The second start voltage Start_2 is input through the two start lines.

In other words, the (n)th stage (STG(n)) receives the first reset signal (Reset_1) through a separate line, and the (n+1)th stage (STG(n+1)) is a separate line The second start voltage (Start_1) is input through, and the (n+1)th scan signal output from the (n+1)th stage STG((n+1)) is the (n)th stage (STG( The (n)th scan signal output from n)) has a logic high and is not output dependently, and the (n)th scan signal is also dependent on the (n+1)th scan signal. ) And is not output. (Logic high and logic low can be opposite.)

That is, the (n)th scan signal and the (n+1)th scan signal output from the nth stage (STG(n)) and the (n+1)th stage (STG(n+1)) are separated. Unlike the prior art, which uses a blank section (for example, a section in which the data enable signal DE is not input) in one frame as a touch section, it is possible to set a touch section between display sections.

Hereinafter, a touch section set between display sections will be described with reference to the drawings.

4 is a timing diagram illustrating a method of driving the touch display device of FIG. 3.

3 and 4, a first start voltage (Start_1), a gate high voltage (not shown), a gate low voltage (not shown), and a gate high voltage (not shown) and a gate are applied to the first stage STG1. When gate shift clocks (not shown) swinging between low voltages (not shown) are input, a first scan signal Scan1 is output. The outputted first scan signal Scan1 is used as a start voltage of the second stage STG2.

The second stage STG2 is between the first scan signal Scan1, a gate high voltage (not shown) and a gate low voltage (not shown), and a gate high voltage (not shown) and a gate low voltage (not shown). Swinging gate shift clocks (not shown) are input to output a second scan signal Scan2 having a pulse width of one horizontal period coinciding with a section in which the first scan signal Scan1 is logic low. The second scan signal Scan2 is input to the reset terminal R of the first stage STG1 to make the first scan signal Scan1 a logic low state.

Subsequent stages, that is, up to the (n)th stage STG(n), sequentially output scan signals in a dependent relationship.

At this time, as described above, the (n)th scan signal (Scan(n)) of the (n)th stage (STG(n)) is the start of the (n+1)th stage (STG(n+1)). It is not input to the terminal (S) and the (n+1)th scan signal (Scan(n+1)) of the (n+1)th stage (STG(n+1)) is the (n)th stage (STG( It is not input to the reset terminal (R) of n)).

The (n)th stage (STG(n)) receives the first reset signal (Reset_1) through a separate first reset line, and the (n+1)th stage (STG(n+1)) is a separate second The second start voltage Start_2 is input through the start line. Here, the first reset signal Reset_1 and the second start voltage Start_2 may be transmitted from the display driver IC 300.

In the (n)th stage STG(n) receiving the first reset signal Reset_1, the connection between the (n)th gate line GL(n) and the gate shift clock (not shown) is blocked, and thus the ( n) The scan signal Scan(n) is set to a logic low state, and the (n+1)th stage STG(n+1) is set to a ready state.

Accordingly, the period before the second start voltage Start_2 is applied to the (n+1)th stage (STG(n+1)) to output the (n+1)th scan signal (Scan(n+1)) This is a blank section so that the data voltage is not applied to the pixel. In other words, the data voltage is input to the pixel P corresponding to the (n)th gate line GL(n) and corresponding to the pixel P corresponding to the (n)th gate line GL(n). An image is displayed and the image is maintained until the second start voltage Start_2 is applied.

When the second start voltage Start_2 is input and the (n+1)th scan signal Scan(n+1) is output and input to the (n+1)th gate line GL(n+1)), the In the pixel P corresponding to the (n+1) gate line GL(n+1)), data following the data voltage input to the pixel P corresponding to the (n)th gate line GL(n)) The voltage is input. That is, the data voltage is input to the pixel P twice, and a section in which the data voltage is not applied can be used as a touch section.

Accordingly, the driving mode of the panel 100 may have a touch driving mode, and the display driver IC 200 touches through m wirings (112 in FIG. 2) with m driving electrodes (111 in FIG. 2). By applying a scan signal, the panel 100 performs touch driving. At this time, the first reset signal Reset_1 is synchronized with a signal indicating the touch driving mode of the synchronization signal generator.

In addition, during the touch period, the touch IC (300 in FIG. 2) generates a touch scan signal and applies the touch scan signal to m driving electrodes (111 in FIG. 2) through the display driver IC 200. The touch input position in the panel 100 can be sensed by receiving a touch detection signal according to the touch scan signal. Thereafter, the second start voltage Start_2 is applied to the (n+1)th stage STG(n+1). ), a gate high voltage and a gate low voltage, and a gate shift clock swinging between the gate high voltage and the gate low voltage are input to output a (n+1)th scan signal Scan(n+1). In this case, the second start voltage Start_2 may be synchronized with a synchronization signal of the synchronization signal generator indicating the display driving mode.

Accordingly, the driving mode is changed to a display driving mode, and a scan signal is applied to the plurality of gate lines GL1 to GL(2n) to operate the pixels.

Meanwhile, the above-described touch section may be repeatedly operated i times (i is a natural number) instead of once per frame. In other words, by applying separate reset signals and start voltages to each of the stages STG corresponding to the start and end points of the touch section, the touch section can be repeatedly operated i times.

The operation of the plurality of stages will be described in detail using numbers as an example.

Assuming that the display device has HD resolution (1280 * 720) and the touch section is operated 10 times per frame, scan signals are sequentially output from the first stage (STG1) to the 128th stage (STG128) and the display section Then, the touch section is set by inputting the first reset signal Reset_1 to the 128th stage STG128.

In the 128th stage STG128, the connection between the 128th gate line GL128 and the gate shift clock is cut off due to the first reset signal Reset_1, and the 129th stage STG129 is in a ready state. In this case, the touch period is a time until the second start voltage Start_2 and the gate shift clock are applied to the 129th stage STG129.

When the touch section is set, the touch IC (300 in Fig. 2) generates a touch scan signal, applies the touch scan signal to the driving electrodes (111 in Fig. 2) through the display driver IC 200, and then scans the applied touch. The touch input position in the panel 100 is sensed by receiving a touch detection signal according to the signal.

Then, the second start voltage (Start_2) and the gate shift clock are input to the 129th stage (STG129) to set the display section, and the 129th scan signal (Scan129) is applied to the 129th gate line (GL129) to operate the pixel. Let it.

Subsequently, each scan signal (Scan129 to Scan256) is sequentially output to the 129th stage (STG129) to the 256th stage (STG256) to have a display section, and a second reset signal (Reset_2) to the 256th stage (STG256). Enter to set the touch section.

In the 256th stage STG256, the connection between the 256th gate line GL256 and the gate shift clock is cut off due to the second reset signal Reset_2, and the 257th stage STG257 is in a ready state. In this case, the touch period is a time until the third start voltage Start_3 and the gate shift clock are applied to the 257th stage STG257.

When the touch section is set, the touch IC (300 in Fig. 2) generates a touch scan signal, applies the touch scan signal to the driving electrodes (111 in Fig. 2) through the display driver IC 200, and then scans the applied touch. The touch input position in the panel 100 is sensed by receiving a touch detection signal according to the signal.

Then, a third start voltage (Start_3) and a gate shift clock are input to the 257 stage (STG257), a display section is set, and a 257 scan signal (Scan257) is applied to the 257 gate line (GL257) to generate a pixel. Operate

This may be repeated until stage 1280 (STG1280) so that 10 display sections and touch sections can be set within one frame.

Meanwhile, in the method of driving a touch display device according to an exemplary embodiment, a second start voltage is provided through a separate start line at the (n+1)th stage (or (2n+1)th stage) corresponding to the end point of the touch section. (Or the third start voltage) was applied, but in another embodiment, the (n+1)th stage (or (2n+1)th stage) corresponding to the end point of the touch section is ) Using the (n)th scan signal (or (2n)th scan signal) of the stage (or the (2n) stage) as the second start voltage (or the third start voltage), The line dim phenomenon may be eliminated, which will be described with reference to the drawings.

5 is a diagram schematically illustrating a configuration of a touch display device according to another exemplary embodiment of the present invention.

As shown in FIG. 5, the touch display device according to another embodiment of the present invention is provided in the start terminal S of the (n+1)th stage (STG(n+1)) compared to the one embodiment. The difference is that the n-th scan signal Scan1 of the n-stage STG(n) is input.

Other configurations of the panel 500, the display driver IC 520, the shift register unit 540, and a plurality of stages (STG1 to STG(2n+1)) that are connected to each other are the same.

6 is a timing diagram illustrating a method of driving the touch display device of FIG. 5.

5 and 6, a start voltage Start, a gate high voltage (not shown), a gate low voltage (not shown), and a gate high voltage (not shown) and a gate low voltage at the first stage STG1. When gate shift clocks (not shown) swinging between (not shown) are input, a first scan signal Scan1 is output. The outputted first scan signal Scan1 is used as a start voltage of the second stage STG2.

The second stage STG2 is between the first scan signal Scan1, a gate high voltage (not shown) and a gate low voltage (not shown), and a gate high voltage (not shown) and a gate low voltage (not shown). Swinging gate shift clocks (not shown) are input to output a second scan signal Scan2 having a pulse width of one horizontal period coinciding with a section in which the first scan signal Scan1 is logic low. The second scan signal Scan2 is input to the reset terminal R of the first stage STG1 to make the first scan signal Scan1 a logic low state.

Subsequent stages, that is, up to the (n)th stage STG(n), sequentially output scan signals in a dependent relationship.

At this time, the reset terminal R of the (n)th stage (STG(n)) is the (n+1)th scan signal (Scan(n+)) of the (n+1)th stage (STG(n+1)). 1)) is not input, and the (n)th stage STG(n) receives the reset signal Reset through a separate reset line.

The (n)th stage (STG(n)) receiving the reset signal (Reset) is disconnected from the connection between the (n)th gate line GL(n) and the gate shift clock (not shown), The scan signal Scan(n) is set to a logic low state, and the (n+1)th stage STG(n+1) is set to a ready state.

In other words, by delaying the pulse period of the gate shift clock (not shown) to be input to the (n+1)th stage (STG(n+1)) using the reset signal (Reset) for a certain time, ) The (n+1)th scan signal Scan(n+1) of the stage STG(n+1) may be set to a ready state in which the gate shift clock (not shown) is not output for a delayed time.

In this case, the data voltage is input to the pixel P corresponding to the (n)-th gate line GL(n) and corresponding to the pixel P corresponding to the (n)-th gate line GL(n). An image is displayed, and an image of the pixel P corresponding to the (n)th gate line GL(n) is maintained until the (n+1)th scan signal Scan(n+1) is output.

Thereafter, when the (n+1)th scan signal Scan(n+1) is output and input to the (n+1)th gate line GL(n+1)), the (n+1)th gate line ( The data voltage input to the pixel P corresponding to the (n)th gate line GL(n) is subsequently input to the pixel P corresponding to GL(n+1)). That is, the data voltage is input to the pixel P twice, and a section in which the data voltage is not applied can be used as a touch section.

Accordingly, the driving mode of the panel 500 may have a touch driving mode, and the display driver IC 520 touches through m wirings (112 in FIG. 2) with m driving electrodes (111 in FIG. By applying a scan signal, the panel 500 performs touch driving. At this time, the reset signal Reset is synchronized with a signal indicating the touch driving mode of the synchronization signal generating unit.

In addition, during the touch period, the touch IC (300 in FIG. 2) generates a touch scan signal and applies the touch scan signal to m driving electrodes (111 in FIG. 2) through the display driver IC 200. By receiving the touch detection signal according to the touch scan signal, it is possible to detect the touch input position in the panel 500.

Thereafter, a gate high voltage and a gate low voltage, and a gate shift clock swinging between the gate high voltage and the gate low voltage are input to the (n+1)th stage STG(n+1), and the (n+1)th The scan signal Scan(n+1) is output. In this case, the (n+1)th scan signal Scan(n+1) may be synchronized with a synchronization signal of the synchronization signal generator indicating the display driving mode.

Accordingly, the driving mode is changed to a display driving mode, and a scan signal is applied to a plurality of gate lines GL1 to GL(2n+1) to operate the pixel.

Meanwhile, as in the above-described exemplary embodiment of the present invention, the touch section may be repeatedly operated i times instead of once per frame. In other words, by applying a reset signal to each of the stages STG corresponding to the start and end points of the touch section, the touch section can be repeatedly operated i times.

The present invention has an effect of improving touch sensing capability by having a plurality of touch sections within one frame. In addition, by setting the display driver IC to a stop state when driving a touch, an abnormal operation can be prevented and noise can be suppressed.

S: Start terminal R: Reset terminal
Reset: Reset signal Start: Start voltage
STG: Stage GL: Gate line
DL: data line 100: panel
140: shift register unit 200: display driver IC
300: touch IC

Claims (16)

a panel including m driving electrodes and m wirings (m is a natural number) and divided into a display area and a non-display area;
A display driver IC for applying a common voltage and a touch signal to the m driving electrodes through the m wires;
And a touch IC that generates the touch signal and applies it to the display driver IC,
The display driver IC includes a shift resist unit generating a scan signal,
The shift resist unit is composed of a plurality of stages,
In the kth stage (k is a natural number), the output of the (k-1)th stage is input to the start terminal, and the output of the (k+1)th stage is input to the reset terminal,
The n-th stage different from the k-th stage (n is a natural number) is different from the output of the (n-1) stages located before it, and a first reset signal different from the output of the (n+1) stage is transmitted to the reset terminal. Touch display device, characterized in that receiving an input.
The method of claim 1,
The first stage receives the first start voltage from the display driver IC to the start terminal,
The (n+1)th stage receives a second start voltage different from the output of the nth stage to a start terminal,
The touch display device according to claim 1, wherein the 2n-th stage receives a second reset signal different from the first reset signal through a reset terminal.
The method of claim 2,
It is a first display section in which the panel displays an image until the first start voltage is input and the first reset signal is input,
It is a first touch section for detecting location information of a touch part before the first reset signal is input and the second start voltage is input,
It is a second display section in which the panel displays an image until the second start voltage is input and the second reset signal is input,
A touch display device that is a second touch section in which the second reset signal is input and the location information of a touch portion is detected before the first start voltage is input.
During the first display period, the first to nth stages (n is a natural number) of the shift register unit sequentially generate the first to nth scan signals and transmit them to the first to nth gate lines, and Displaying an image by transmitting a data signal of;
Transmitting a touch driving signal to a plurality of touch electrodes during a touch period and receiving a touch sensing signal from the touch electrodes to detect location information of a touch area;
During the second display period, (n+1) to 2nth scan signals are sequentially generated in the (n+1) to 2nth stages of the shift resist unit and transferred to the (n+1) to 2nth gate lines And transmitting a data signal to the plurality of data lines to display an image,
The k-th stage different from the n-th stage (k<2n, k is a natural number) receives the (k-1)th scan signal of the (k-1)th stage to the start terminal, and the (k+1)th stage The (k+1)th scan signal is input to a reset terminal, and the nth stage receives a reset signal different from the (n+1)th scan signal of the (n+1) stage to the reset terminal. A method of driving a touch display device.
The method of claim 4,
The first display section includes the step of inputting a first start voltage from a display driver IC to a start terminal of the first stage,
The touch section includes inputting the reset signal different from the (n+1)th scan signal to a reset terminal of the nth stage,
And in the second display section, inputting a second start voltage different from the nth scan signal to a start terminal of the (n+1)th stage.
The method of claim 4,
The driving method of a touch display device, wherein the touch section is set according to the number of times the reset signal is input during one frame.
The method of claim 6,
The driving method of a touch display device, wherein the number of times of inputting the reset signal is more than once per frame. The method of claim 1,
During the first display period, the first to nth stages of the shift register unit sequentially generate first to nth scan signals and transmit them to the first to nth gate lines, and the data signals are transmitted to a plurality of data lines. Video display,
During the touch period, the touch IC applies the touch signal to a driving electrode,
During the second display period, (n+1) to 2nth scan signals are sequentially generated in the (n+1) to 2nth stages of the shift resist unit and transferred to the (n+1) to 2nth gate lines And, a data signal is transmitted to the plurality of data lines to display an image.
Touch display.
a panel including m driving electrodes and m wirings (m is a natural number);
A touch IC that generates a touch signal applied to the driving electrode through the wiring;
It includes a shift resist unit for generating a scan signal,
The shift resist unit is composed of a plurality of stages,
In the kth stage (k is a natural number), the output of the (k-1)th stage is input to the start terminal, and the output of the (k+1)th stage is input to the reset terminal,
The n-th stage different from the k-th stage (n is a natural number) is different from the output of the (n-1) stages located before it, and a first reset signal different from the output of the (n+1) stage is transmitted to the reset terminal. Touch display device, characterized in that receiving an input.
The method of claim 9,
The first stage receives the first start voltage to the start terminal,
The (n+1)th stage receives a second start voltage different from the output of the nth stage to a start terminal,
The touch display device according to claim 1, wherein the 2n-th stage receives a second reset signal different from the first reset signal through a reset terminal.
The method of claim 10,
It is a first display section in which the panel displays an image until the first start voltage is input and the first reset signal is input,
It is a first touch section for detecting location information of a touch part before the first reset signal is input and the second start voltage is input,
It is a second display section in which the panel displays an image until the second start voltage is input and the second reset signal is input,
A touch display device that is a second touch section in which the second reset signal is input and the location information of a touch portion is detected before the first start voltage is input.
The method of claim 9,
During the first display period, the first to nth stages of the shift register unit sequentially generate first to nth scan signals and transmit them to the first to nth gate lines, and the data signals are transmitted to a plurality of data lines. Video display,
During the touch period, the touch IC applies the touch signal to a driving electrode,
During the second display period, (n+1) to 2nth scan signals are sequentially generated in the (n+1) to 2nth stages of the shift resist unit and transferred to the (n+1) to 2nth gate lines And, a data signal is transmitted to the plurality of data lines to display an image.
Touch display.
First to nth stages (n is a natural number) for sequentially generating first to nth scan signals and transferring them to the first to nth gate lines during the first display period;
During the second display period, the (n+1)th to 2nth stages are sequentially generated and transmitted to the (n+1)th to 2nth gate lines,
During the touch section between the first display section and the second display section, the first to second n stages stop outputting the corresponding scan signal,
The k-th stage different from the n-th stage (k<2n, k is a natural number) receives the (k-1)th scan signal of the (k-1)th stage to the start terminal, and the (k+1)th stage The (k+1)th scan signal is input to a reset terminal, and the nth stage receives a reset signal different from the (n+1)th scan signal of the (n+1) stage to the reset terminal. Shift resist circuit.
The method of claim 13,
Inputting a first start voltage to the start terminal of the first stage in the first display section,
Inputting the reset signal different from the (n+1)th scan signal to the reset terminal of the nth stage in the touch section,
A shift resist circuit for inputting a second start voltage different from the nth scan signal to the start terminal of the (n+1)th stage in the second display section.
The method of claim 13,
The touch section is a shift register circuit that is set according to the number of times the reset signal is input during one frame.
The method of claim 15,
The number of times the reset signal is input is at least once per frame.

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