KR102338709B1 - Display device and method of driving the same - Google Patents

Abstract

An object of the present invention is to provide a display device for supplying touch signals having different sizes to each MUX group constituting a touch panel, and a method for driving the same.

Description

Display device and its driving method

The present invention relates to a display device having a built-in self-cap type touch panel and a driving method therefor.

The touch panel is used in display devices such as a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting display (OLED), an electrophoretic display (EPD), etc. It is a type of input device installed so that a user can input information by directly touching a screen with a finger or a pen while looking at the display device.

In particular, in recent years, for slimming portable terminals such as smart phones and tablet PCs, the demand for in-cell type display devices in which elements constituting a touch panel are embedded in a panel of a display device is increasing.

A method of configuring the touch panel may be divided into a self-cap method and a mutual method.

Among them, in a conventional in-cell type display device having a built-in touch panel using a self-cap method, when the number of touch electrodes in the horizontal direction is n and the number of touch electrodes in the vertical direction is m , a total of nxm touch electrodes are provided.

1 is an exemplary graph illustrating deviations of baselines of MUX groups in a conventional display device in which touch electrodes are divided into six MUX groups.

When the number of touch electrodes is large, the touch electrodes are divided into a plurality of groups (hereinafter, simply referred to as 'MUX groups'), and a touch is sequentially sensed for each MUX group.

In order to minimize the deviation of the initial capacitances of the touch electrodes and secure the uniformity of the touch baselines of the touch electrodes, the touch panel may be designed in various forms.

In addition, in the manufacturing process of the touch panel, a process of uniformly matching the deviation-generated touch electrode with other touch electrodes is being performed.

In more detail, in order to maintain the characteristics of the touch electrodes uniformly, the design method of the touch panel may be changed, or the process of matching the deviation-generated touch electrodes with the characteristics of other touch electrodes may be performed. have.

However, since the display device senses a very small amount of change in capacitance, even when the touch panel is manufactured by a perfect process, there is inevitably a deviation between the touch electrodes. In addition, since the display device detects a small amount of change in capacitance, it reacts sensitively to even a small difference.

Accordingly, it is difficult for the characteristics of all touch electrodes to be uniform even by the method described above, and accordingly, touch sensitivity may be reduced in a display device to which a conventional touch panel is applied.

For example, even if the process of uniformly matching the characteristics of the touch electrodes is performed, as shown in FIG. 1 , a difference in the baseline may occur for each MUX group. Here, the baseline indicates an average value of raw data received from the touch electrodes included in one MUX group when there is no touch, and a large size of the baseline of the MUX group indicates that the touch constituting the MUX group It means that the noise of the electrodes is large.

In an ideal case, the baselines measured from all mux groups should have the same value. However, due to the above reasons, the baselines of the MUX groups have different values, as shown in FIG. 1 .

Accordingly, when a touch is sensed, an error may occur.

The present invention has been proposed to solve the above-described problems, and an object of the present invention is to provide a display device for supplying touch signals having different sizes to each MUX group constituting a touch panel, and a method for driving the same.

According to an aspect of the present invention, there is provided a display device comprising: a panel having a built-in touch panel; and a touch sensing unit having two or more touch electrodes and sequentially driving the mux groups constituting the touch panel, wherein the touch sensing unit supplies touch signals of different sizes to each mux group, Receive detection signals from the MUX groups.

According to the present invention, variation in characteristics between MUX groups constituting a touch panel can be reduced, and thus, touch performance can be improved.

1 is an exemplary graph illustrating deviations from baselines of MUX groups in a conventional display device in which touch electrodes are divided into six MUX groups;
2 is an exemplary view showing the configuration of a display device according to the present invention.
3 is an exemplary diagram illustrating a configuration of a touch sensing unit applied to a display device according to the present invention.
4 is an exemplary diagram illustrating the configuration of an output unit of a touch sensing unit applied to a display device according to the present invention.
5 is a graph showing the sizes of baselines of MUX groups by the display device according to the present invention.

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

2 is an exemplary view showing the configuration of a display device according to the present invention.

The present invention relates to a display device in which a touch panel using a self-cap method and a capacitive method is embedded in a panel.

As shown in FIG. 2 , the display device according to the present invention includes a touch panel 500 including a large number of touch electrodes 510 , and each of the touch electrodes 510 includes a touch electrode line. It is connected to the touch sensing unit 600 in a one-to-one manner through 520 .

When the number of the touch electrodes 510 is large, the touch electrodes 510 are divided into at least two mux groups, and the touch sensing unit 600 sequentially drives the mux groups, It is determined whether there is a touch in the included touch electrodes 510 .

Hereinafter, as shown in FIG. 2 , a touch panel 500 including six MUX groups MUX1G to MUX6G will be described as an example of the present invention.

In addition, the present invention can be applied to various types of display devices capable of outputting an image using a common electrode and sensing a touch using the common electrode. However, below, a liquid crystal display device is described as an example of the present invention.

The display device according to the present invention is for reducing characteristic deviation between the MUX groups (MUX1G to MUX6G).

To this end, the display device according to the present invention includes a panel 100 in which the touch panel 500 including the mux groups MUX1G to MUX6G is embedded, as shown in FIG. 2 , and the mux groups ( The touch sensing unit 600 for sequentially driving MUX1G to MUX6G, the gate driver 200 for sequentially supplying gate pulses to the gate lines GL1 to GLg formed on the panel 100, the panel A data driver 300 supplying data voltages to the data lines DL1 to DLd formed in 100 , a controller 400 controlling the gate driver 200 and the data driver 300 , and the and a voltage supply unit 700 that supplies a high voltage VDD to the touch sensing unit 600 . In particular, the touch sensing unit 600 supplies touch signals of different sizes to each MUX group, and receives sensing signals from the MUX groups.

First, the panel 100 includes two glass substrates and a liquid crystal layer provided between the glass substrates.

On the lower glass substrate of the panel 100, a plurality of data lines, a plurality of gate lines intersecting the data lines, and a plurality of thin film transistors formed at intersections of the data lines and the gate lines ( TFT: Thin Film Transistor), a plurality of pixel electrodes for charging the data voltage to the pixel, and touch electrodes 510 for driving the liquid crystal filled in the liquid crystal layer together with the pixel electrode are formed. The lower glass substrate is referred to as a TFT substrate.

A black matrix BM and a color filter are formed on the upper glass substrate of the panel 100 . The upper glass substrate is referred to as a CF substrate.

A polarizing plate is attached to each of the TFT substrate and the CF substrate, and an alignment film for setting a pretilt angle of the liquid crystal is formed on an inner surface of both surfaces of the CF substrate and the TFT substrate in contact with the liquid crystal. A column spacer for maintaining a cell gap of the liquid crystal layer may be formed between the TFT substrate and the CF substrate.

The present invention relates to a display device in which the touch electrodes 510 constituting the touch panel 500 are included in the panel 100 as described above.

Next, the touch panel 500 performs a function of detecting whether a user touches, and in particular, the touch panel 500 applied to the present invention uses a capacitive method to which a self-cap method is applied. . The touch panel 500 includes a plurality of touch electrodes 510 and a plurality of touch electrode lines 520 .

Each of the plurality of touch electrodes 510 may be formed over a plurality of pixels formed on the panel 100 . During the touch sensing period, the touch electrodes 510 perform a function of detecting whether a touch has been made by using the touch signal supplied from the touch sensing unit 600, and during the image output period, the touch electrodes are formed in each pixel. It functions to drive the liquid crystal together with the pixel electrode.

One end of each of the plurality of touch electrode lines 520 is connected to the touch electrode 510 , and the other end is connected to the touch sensing unit 600 .

The number of the touch electrodes 510 may be set in various ways according to the size and shape of the touch panel 500 . Hereinafter, for convenience of description, as shown in FIG. 2 , a touch panel 500 including 240 touch electrodes will be described as an example of the present invention.

As shown in FIG. 2 , the touch electrodes may be divided into six mux groups MUX1G to MUX6G.

In this case, 40 (=240 /6) touch electrodes are provided in each of the MUX groups.

Next, in the image output period, the data driver 300 converts the image data input from the controller 400 into an analog data voltage, and every one horizontal period in which a gate pulse is supplied to the gate line GL. Data voltages corresponding to one horizontal line are supplied to the data lines. For example, the data driver 300 converts the image data into a data voltage using gamma voltages supplied from a gamma voltage generator (not shown), and then converts the data voltage to the data voltage during the image output period. output to the data line.

Next, the gate driver 200 shifts the gate start pulse transmitted from the controller 400 according to a gate shift clock, and sequentially moves the gate lines GL1 to GLg. to, the gate pulses are sequentially supplied. A switching transistor provided in each of the pixels is turned on by the gate pulse.

The gate driver 200 supplies a gate-off signal to the gate lines GL1 to GLg during the remaining period in which the gate pulse is not supplied. The switching transistor is turned off by the gate-off signal.

Next, the control unit 400 receives timing signals such as a data enable signal (DE) and a dot clock (CLK) from an external system, and operates timing of the data driver 300 and the gate driver 200 . Control signals (GCS, DCS) for controlling the In addition, the control unit 400 rearranges the input image data input from the external system and outputs the rearranged image data to the data driver 300 .

Also, the controller 400 may generate a touch control signal for controlling the operation timing of the input and output of the touch sensing unit 600 and transmit the generated touch control signal to the touch sensing unit 600 .

The touch control signal may include a touch synchronization signal (TSS) for discriminating the image output period and the touch sensing period and a noise analysis signal indicating a noise analysis mode.

The touch sensing unit 600 may distinguish the image output period and the touch sensing period according to the touch synchronization signal TSS.

The noise analysis signal may be generated by the control unit 400 and transmitted to the touch sensing unit 600 when, for example, power is supplied to the display device and the display device is turned on. Also, the control unit 400 may generate the noise analysis signal and transmit it to the touch sensing unit 600 every preset period, for example, 24 hours, 30 days, 60 days, or 90 days.

Next, the voltage supply unit 700 supplies the high voltage VDD to the touch sensing unit 600 . The high voltage VDD may also be supplied to the data driver 300 , the gate driver 200 , and the controller 400 .

Finally, the touch sensing unit 600 sequentially supplies a touch signal to the MUX groups during the touch sensing period according to the touch synchronization signal TSS. For example, in the first touch sensing period, touch signals are simultaneously supplied to the touch electrodes included in the first mux group MUX1G, and in the sixth touch sensing period, the touch electrodes included in the sixth mux group MUX6G to simultaneously supply touch signals.

In this case, the touch sensing unit 600 supplies touch signals of different sizes for each MUX group.

For example, the touch sensing unit 600 may supply touch signals having a voltage of 10V to the touch electrodes included in the first mux group MUX1G, and may be included in the sixth mux group MUX6G. Touch signals having a voltage of 8V may be supplied to the touch electrodes. In this case, the magnitudes of the touch signals transmitted to the six mux groups are not necessarily different from each other.

During the touch sensing period, the touch sensing unit 600 supplies the touch signals to the touch electrodes, and then receives sensing signals from the touch electrodes. The touch sensing unit 600 converts the sensing signals into digital sensing signals. The touch sensing unit 600 may transmit the digital sensing signals to a component that determines the presence or absence of a touch and the position of a touch on the touch panel, or directly transmits the presence of a touch and the position of a touch on the touch panel 500 . may judge.

When the noise analysis signal is received from the control unit 600, the touch sensing unit 600 sets the size of the touch signal to be transmitted for each MUX group, and controls the size of the touch signal set for each MUX group. Save the information.

The touch sensing unit 600 generates the touch signals using the information during the touch sensing period and supplies them to the touch electrodes.

The touch sensing unit 600 may be independently configured as shown in FIG. 2 . However, the touch sensing unit 600 may be included in the data driver 300 or may be included in the control unit 400 .

A detailed configuration and function of the touch sensing unit 600 will be described in detail below with reference to FIGS. 3 to 5 .

3 is an exemplary diagram illustrating a configuration of a touch sensing unit applied to a display device according to the present invention.

As described above, the touch sensing unit 600 sequentially drives the MUX groups MUX1G to MUX6G during the touch sensing period, and receives sensing signals from the touch electrodes included in the MUX groups. do.

In particular, the touch sensing unit 600 supplies touch signals of different sizes for each MUX group.

To this end, the touch sensing unit 600 sets the size of the touch signal to be transmitted to the MUX groups during the noise analysis period in which the noise analysis signal NAS is received, and the touch signal having the set size during the touch sensing period. is transmitted to the touch electrodes provided in the MUX group matched with the touch signal.

As shown in FIG. 3 , the touch sensing unit 600 sequentially receives the receiving unit 630 for receiving the sensing signal received from the touch panel 500 and the mux groups MUX1G to MUX6G. The switching unit 620 connected to the 630, and during the noise analysis period, analyzes the raw data received from the receiving unit 620, and determines the size of the touch signal to be transmitted to each of the MUX groups according to the analysis result. In the touch sensing period, the touch signal supply unit 660, which generates a touch signal according to the information set in the noise analysis period, and transmits it to the MUX group connected to the switching unit 620, the sensing received from the receiving unit 620 When the conversion unit 650 for converting a signal into a digital sensing signal and the noise analysis signal NAS are received, the touch signal supply unit 660 controls the touch signal supply unit 660 to set the size of the touch signals. and a touch control unit 640 controlling the touch signal supply unit 660 so that the touch signal supply unit 660 sequentially outputs the touch signal to the MUX groups when the touch sensing period is reached.

First, the receiver 630 receives a sensing signal received from the touch panel 500 .

For example, when the receiving unit 630 is connected to the touch electrodes provided in the first mux group MUX1G through the switching unit 620 , the receiving unit 630 is connected to the first mux group ( The sensing signals are received from the touch electrodes provided in the MUX1G). The sensing signals received from the touch electrodes are analog signals.

Also, when the receiving unit 630 is connected to the touch electrodes provided in the sixth MUX group MUX6G through the switching unit 620 , the receiving unit 630 is configured to operate the sixth MUX group MUX6G. The sensing signals are received from the touch electrodes provided in the . FIG. 3 shows the receiver 630 connected to the touch electrodes provided in the first mux group MUX1G through the switching unit 620 . In this case, the first to fortieth touch electrodes provided in the first mux group MUX1G are connected to the first to fourth touch electrode lines TL1 to TL40.

Second, the switching unit 620 sequentially connects the MUX groups MUX1G to MUX6G to the receiving unit 630 according to the MUX group selection signal MSS transmitted from the touch control unit 640 .

In this case, the touch electrodes provided in one MUX group are simultaneously connected to the receiving unit 630 and the touch signal supplying unit 660 . Accordingly, the touch electrodes provided in one MUX group simultaneously receive touch signals having the same size from the touch signal supply unit 660 , and transmit analog sensing signals to the receiving unit 630 .

Third, the conversion unit 650 converts the sensing signal received from the receiving unit 630 into a digital sensing signal.

As described above, the detection signal received by the receiver 630 is an analog signal. The converter 650 converts the analog detection signal into a digital detection signal.

Another component of the conversion unit 650 or the touch sensing unit 600, or the control unit 400 or a separate component, uses digital type sensing signals to It is possible to determine the presence or absence of a touch and the location of the touch.

Fourth, when the noise analysis signal NAS is received from the control unit 400, the touch control unit 640 is configured such that the touch signal supply unit 660 sets the size of the touch signals. to control

For example, when the noise analysis signal NAS is received, the touch control unit 640 determines the noise analysis period, and the touch signal supply unit 660 determines the size of the touch signal to be transmitted to each MUX group. to set Accordingly, the touch signal supply unit 660 sets the size of the touch signals corresponding to the MUX groups.

The touch controller 640 determines whether it is the touch sensing period using the touch synchronization signal TSS. When the touch sensing period is reached, the touch control unit 640 controls the touch signal supply unit 660 so that the touch signal supply unit 660 sequentially outputs the touch signal to the MUX groups.

Accordingly, the touch signal supply unit 660 sequentially transmits the touch signal to the MUX groups. In this case, the sizes of the touch signals transmitted for each MUX group may all be different, or at least two or more may be the same.

Fifth, the touch signal supply unit 660 supplies touch signals to the MUX groups through the switching unit 620 during the noise analysis period. In this case, the touch signals may have the same magnitude.

For example, during the noise analysis period, a characteristic deviation between the MUX groups is determined. To this end, a touch signal having the same size may be supplied to the MUX groups.

In addition, the touch signal supply unit 660 analyzes the raw data received from the receiving unit 620 during the noise analysis period, and sets the size of the touch signal to be transmitted to each of the MUX groups according to the analysis result. do.

During the noise analysis period, the raw data received from the receiver 620 are generated by touch signals having the same size.

The touch signal supply unit 650 analyzes the raw data, calculates an average value of touch electrodes provided in one MUX group, and defines the average value as a baseline of the MUX group. 2 and 3 , when six mux groups are provided in the touch panel 500, six baselines are generated.

A large size of the baselines means that there is a lot of noise.

The touch signal supply unit 650 sets the size of the touch signal to be transmitted to each of the MUX groups in consideration of the sizes of the baselines. The touch signal supply unit 650 stores set information.

The touch signal supply unit 660 generates a touch signal according to information set in the noise analysis period during the touch sensing period and transmits the generated touch signal to the MUX group connected to the switching unit 620 . In this case, the touch signal supply unit 660 may supply touch signals having different sizes for each MUX group.

In order to perform the above-described function, the touch signal supply unit 660 analyzes the raw data received from the reception unit 630 during the noise analysis period, as shown in FIG. 3 , and the MUX group an analysis unit 661 that determines the baselines of the multiplexers, sets the sizes of touch signals to be transmitted to the mux groups using the baselines, and stores the set information, and in the touch sensing period, the touch control unit 640 ) to generate a touch signal to be transmitted to the MUX group corresponding to the MUX group selection signal (MSS) transmitted therefrom, and an output unit 662 for outputting the touch signal to the switching unit.

The analyzer 661 sets the size of the touch signals to be transmitted to the MUX groups during the noise analysis period, and stores the set information.

In this case, the analyzer 661 may set the size of the touch signals to be transmitted to the MUX groups by using the sensing signals received from the touch panel by touch signals having the same size. In addition, the analysis unit 661 may set the size of the touch signals to be transmitted to the mux groups by using the sensing signals received by the touch signals having different sizes supplied during the touch sensing period. have.

In the touch sensing period, the output unit 662 generates a touch signal to be transmitted to each MUX group according to the information set in the noise analysis period, and transmits the generated touch signal to the MUX group connected to the switching unit 620 .

In this case, the analysis unit 661 receives the MUX group selection signal from the touch controller 640 and extracts information matching the MUX group corresponding to the MUX group selection signal. The information includes a magnitude of a touch signal to be transmitted to the touch electrodes provided in the MUX group. The analysis unit 661 transmits a voltage level control signal VLCS corresponding to the information to the output unit 662 .

The output unit 662 generates a touch signal using the voltage transmitted from the voltage supply unit 700 during the touch sensing period according to the voltage level control signal VLCS transmitted from the analysis unit 661 . After that, the touch signal is supplied to the touch electrodes provided in the MUX group through the switching unit 620 .

In this case, the switching unit 620 connects the touch electrodes provided in the MUX group corresponding to the MUX group selection signal to the receiving unit 630 .

The output unit 662 may supply touch signals having the same size to the MUX groups during the noise analysis period.

However, the output unit 662 may transmit touch signals having different sizes supplied during the touch sensing period to the MUX groups.

The configuration of the output unit 662 will be described with reference to FIG. 4 .

4 is an exemplary diagram illustrating the configuration of an output unit of a touch sensing unit applied to a display device according to the present invention.

In the noise analysis period, the output unit 662 supplies touch signals having the same size to the mux groups or transmits touch signals having different sizes supplied in the touch sensing period to the mux group can be transmitted to Accordingly, the analysis unit 661 sets the size of the touch signals to be transmitted to the MUX groups.

The output unit 662 generates touch signals having different magnitudes using the high voltage VDD supplied from the voltage supply unit 700 during the touch sensing period. The output unit 662 sequentially supplies the touch signals to the MUX groups.

In more detail, the output unit 662 generates the touch signal by changing a voltage supplied from the outside in the touch sensing period according to information set in the noise analysis period.

To this end, as shown in FIG. 4 , the output unit 662 includes a string unit 663 to which a voltage is supplied from the outside, to which a plurality of resistors R1 to Rn are connected, and the analysis unit 661 . ) according to the voltage level control signal VLCS transmitted from the selector 664 for selecting any one of the resistors, and a generator for generating the touch signal using the voltage transmitted from the selector 664 . (666).

First, as shown in FIG. 4 , the string unit 663 is connected to the voltage supply unit 700 and receives the high voltage VDD from the voltage supply unit 700 .

The number and size of the resistors connected to the string unit 663 may be variously changed according to the number and size of the touch signal to be generated.

Second, the selector 664 selects one of the resistors according to the voltage level control signal VLCS. According to the selected resistance, the magnitude of the voltage to be transmitted to the generator 666 is changed.

Third, the generation unit 666 generates the touch signal using the voltage transmitted from the selection unit 664 , and provides the generated touch signal to one MUX group through the switching unit 620 . transmitted to the touch electrodes.

As shown in FIG. 4 , the selection unit 664 and the generation unit 666 may be provided for each MUX group.

In this case, the selection unit 664 may include a selection value 665 corresponding to the number of MUX groups, and the generation unit 666 selects a generator 667 corresponding to the number of MUX groups. can be provided

In this case, the selector 665 corresponding to the voltage level control signal VLCS is driven to select a specific voltage, and the generator 667 corresponding to the selector 665 uses the specific voltage to generate the touch signal. to create

However, each of the selection unit 664 and the generation unit 666 may be composed of one component. In this case, the selector 664 selects a specific voltage according to the voltage level control signal VLCS, and the generator 666 generates a touch signal using the specific voltage.

The generated touch signal is transmitted to the switching unit 620 . The switching unit 620 is connected to any one of the MUX groups according to the MUX group selection signal MSS. Accordingly, the touch signal transmitted from the generating unit 666 is supplied to the touch electrodes provided in the MUX group connected to the switching unit 620 .

An example of the touch signals is shown in FIG. 4 . For example, when the selector 665 and the generator 667 are provided for each of the MUX groups, touch signals output through the generators 667 are transmitted to different MUX groups.

In this case, the magnitudes of the touch signals may all be different, or the magnitudes of at least two touch signals may be the same.

In more detail, as shown in FIG. 4 , the touch signal includes a plurality of pulses, and the magnitude (ΔV) of the pulses is determined by the selection unit 664 . The touch signal may be a voltage, and thus, the magnitude (ΔV) of the pulses corresponds to the magnitude of the voltage.

In particular, among the touch signals shown in FIG. 4 , the magnitude of the touch signal supplied to the third mux group MUX3G is the largest, and the fourth mux group MUX4G, the second mux group MUX2G, and the sixth mux group MUX3G. In the order of the group MUX6G, the first mux group MUX1G, and the fifth mux group MUX5, the size of the touch signals decreases.

5 is a graph showing the sizes of baselines of MUX groups by the display device according to the present invention. In FIG. 5, (a) shows the sizes of the baselines of the MUX groups measured during the noise analysis period, and (b) shows the sizes of the baselines when touch signals of different sizes are supplied to the MUX groups.

For example, baselines of MUX groups measured during the noise analysis period are as shown in (a).

Among the baselines shown in (a), the size of the baseline of the third MUX group MUX3G is the smallest, and the fourth MUX group MUX4G, the second MUX group MUX2G, and the sixth MUX group MUX6G have the smallest size. , the sizes of the baselines increase in the order of the first mux group MUX1G and the fifth mux group MUX5.

The size of the baselines may be proportional to the noise level, for example. For example, a small size of the baseline means that noise is small, and a large size of the baseline means that the noise is large.

In this case, the analysis unit sets the largest size of the touch signal supplied to the third mux group MUX3G, and sets the fourth mux group MUX4G, the second mux group MUX2G, and the sixth mux group MUX6G. , in the order of the first mux group MUX1G and the fifth mux group MUX5, the size of the touch signal may be set to be small.

Accordingly, as shown in FIG. 4 , the output unit 662 maximizes the size of the touch signal supplied to the third mux group MUX3G, and the fourth mux group MUX4G and the second mux group (MUX2G), the sixth mux group (MUX6G), the first mux group (MUX1G), and the fifth mux group (MUX5) to reduce the size of the touch signals in the order.

In detail, the largest touch signal is supplied to the third mux group MUX3G having the smallest baseline size, and the smallest touch signal is supplied to the fifth mux group MUX5 having the largest baseline size. signal is supplied.

Accordingly, as shown in (b), the sizes of the baselines of the MUX groups have similar values.

The similar size of the baselines means that there is little variation in characteristics between the MUX groups.

Therefore, according to the present invention, the touch sensitivity can be improved.

A display device driving method according to the present invention will be briefly described as follows.

First, during the noise analysis period, raw data received from the touch panel 500 is analyzed, and the magnitude of the touch signal to be transmitted to each of the MUX groups constituting the touch panel 500 is set according to the analysis result. do.

Second, in the touch sensing period, touch signals are generated according to the information set in the noise analysis period, and the touch signals are sequentially transmitted to the mux groups.

Since the detailed contents of the above processes are the same as those described with reference to FIGS. 2 to 5 , a detailed description thereof will be omitted.

The present invention described above is briefly summarized as follows.

According to the present invention, the sizes of baselines between MUX groups can be matched as uniformly as possible, and thus, touch performance can be improved.

In particular, according to the present invention, by adjusting the magnitude of the voltage of the touch signal supplied to each MUX group, it is possible to uniformly match the deviation of the baselines between the MUX groups.

For example, in the present invention, the sizes of the baselines of the MUX groups can be uniformly matched by supplying touch signals of different sizes to each MUX group.

In particular, in the present invention, when the display device receives power and starts driving, the baseline of each MUX group is measured during the noise analysis period, and based on the measured baselines, the touch signal to be supplied to each MUX group is measured. Set the voltage level.

For example, in the present invention, the voltage of the touch signal supplied to the touch electrodes provided in the MUX group having a large baseline size is lowered, and the voltage is supplied to the touch electrodes provided in the MUX group having a small baseline size. The magnitude of the voltage of the touch signal may be increased. In this way, the uniformity of the baselines of the MUX groups may be improved.

In addition, according to the present invention, the touch signal supply unit provided in the touch sensing unit 600 generates touch signals having different magnitudes using a voltage supplied from the outside. Accordingly, in order to generate touch signals having different magnitudes, additional configurations are not required.

Those skilled in the art to which the present invention pertains will understand that the present invention may be embodied in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the above detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: panel 200: gate driver
300: data driver 400: control unit
500: touch panel 600: touch sensing unit

Claims (7)

a panel having a built-in touch panel including a plurality of touch electrodes; and
a touch sensing unit that sequentially drives a plurality of mux groups divided to include at least two or more touch electrodes among the plurality of touch electrodes;
The touch sensing unit is configured to supply touch signals of different sizes to each of the MUX groups, and receive sensing signals from the MUX groups. The method of claim 1,
The touch sensing unit,
a receiver configured to receive the detection signals from the mux groups;
In the noise analysis period, the raw data received from the receiver is analyzed, and the size of the touch signal to be transmitted to each of the MUX groups is set according to the analysis result, and in the touch detection period, according to the information set in the noise analysis period a touch signal supply unit that generates a touch signal and transmits it to the mux group;
a switching unit selectively connecting the MUX groups to the receiving unit and the touch signal supply unit;
a conversion unit converting the sensing signal received from the receiving unit into a digital sensing signal; and
and a touch controller configured to control the touch signal supply unit by dividing the noise analysis period and the touch sensing period based on a touch control signal from the outside. 3. The method of claim 2,
The touch signal supply unit,
During the noise analysis period, raw data received from the receiver is analyzed, baselines of the mux groups are determined, sizes of touch signals to be transmitted to the mux groups are set using the baselines, and set information an analysis unit that stores them; and
and an output unit for generating a touch signal to be transmitted to the MUX group corresponding to the MUX group selection signal transmitted from the touch control unit during the touch sensing period and outputting the touch signal to the switching unit. 4. The method of claim 3,
The touch control unit transmits the mux group selection signal to the switching unit during the touch sensing period,
The switching unit is configured to connect any one of the MUX groups to the receiving unit according to the MUX group selection signal. 3. The method of claim 2,
The touch signal supply unit generates the touch signal by varying a voltage supplied from the outside during the touch sensing period according to information set in the noise analysis period. 4. The method of claim 3,
the output unit,
a string unit to which a voltage is supplied from the outside and to which a plurality of resistors are connected;
a selection unit that selects any one of the resistors according to the voltage magnitude control signal transmitted from the analysis unit; and
and a generator configured to generate the touch signal by using the voltage transmitted from the selector. During the noise analysis period, raw data received from the plurality of MUX groups divided to include at least two or more touch electrodes among the plurality of touch electrodes included in the touch panel is analyzed, and according to the analysis result, the MUX groups are selected. setting different sizes of touch signals to be transmitted respectively; and
In a touch sensing period, according to the information set in the noise analysis period, generating touch signals of different sizes for each MUX group, and sequentially transmitting the touch signals to the MUX groups.

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