KR102312902B1 - Display device - Google Patents

Abstract

An object of the present invention is to provide a display device that supplies touch signals having different frequencies to each MUX group constituting a touch panel.

Description

display device {DISPLAY DEVICE}

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

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, in order to slim down portable terminals such as smart phones and tablet PCs, the demand for in-cell type display devices in which elements constituting the touch panel are embedded in the panel of the 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 electrode 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 above-described method, and thus, touch sensitivity may be reduced in a display device to which a conventional touch panel is applied.

For example, even if a 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 the 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.

Ideally, 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.

In more detail, a conventional display device having a built-in touch panel includes a plurality of touch electrodes. In this case, it is difficult for the receiver for receiving the sensing signals received from the touch electrodes to simultaneously receive the sensing signals due to various reasons. Accordingly, the touch electrodes are divided into N mux groups, and the receiver is sequentially connected to the N mux groups to receive sensing signals.

The touch electrodes are divided into N mux groups, and the noise level of the mux groups is different as shown in FIG. 1 due to the deviation of the mux groups.

Since the noise levels of the mux groups are different, the touch sensitivity may be changed according to the position of the touch panel.

For example, since the noise levels of the MUX groups are different, even if touch signals having the same sampling frequency are supplied to the MUX groups, the influence of the touch signals may be different for each MUX group. In addition, since the main frequency band most affected by each MUX group is different, the noise level is different for each MUX group.

Accordingly, the touch performance and touch sensitivity of the touch panel may be deteriorated, and an error may occur when the touch is sensed.

The present invention has been proposed to solve the above problems, and it is a technical task to provide a display device that supplies touch signals having different frequencies to each mux group constituting a touch panel.

A display device according to the present invention for achieving the above technical problem, 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 a touch signal having a different frequency to each mux group, , receives 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.

The present invention analyzes a main frequency band that affects each MUX group, and supplies a touch signal having a frequency of the most stable band to the touch electrodes provided in the MUX group.

Accordingly, the amount of noise in one mux group may be reduced, and noise deviation between mux groups may also be reduced. Accordingly, touch performance and touch sensitivity may be increased.

1 is an exemplary graph showing the deviation of 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 a touch synchronization signal input to a touch sensing unit applied to a display device according to the present invention and waveforms of the touch signal;
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 through 520 in a one-to-one manner.

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.

Also, 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 will be described as an example of the present invention.

The display device according to the present invention is to reduce noise deviation between the MUX groups by minimizing the noise of each of 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 , the mux groups ( The touch sensing unit 600 sequentially drives MUX1G to MUX6G, the gate driver 200 sequentially supplies gate pulses to the gate lines GL1 to GLg formed on the panel 100, and 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 for supplying a voltage required to the touch sensing unit 600 . In particular, the touch sensing unit 600 supplies touch signals having different frequencies for 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 crossing 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 sensing 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 variously set 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 control unit 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 control unit 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 Also, 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 control unit 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 that distinguishes 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, for example, when power is supplied to the display device and the display device is turned on, the noise analysis signal may be generated by the control unit 400 and transmitted to the touch sensing unit 600 . Also, the control unit 400 may generate the noise analysis signal and transmit it to the touch sensing unit 600 for a preset period, for example, every 24 hours, 30 days, 60 days, or 90 days.

Next, the voltage supply unit 700 supplies a necessary voltage to the touch sensing unit 600 . The voltage supply unit 700 may supply a necessary voltage to the data driver 300 , the gate driver 200 , and the control unit 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. The touch signal may be a voltage or a current.

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

For example, the touch sensing unit 600 may supply touch signals having a frequency of 1 Hz 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 frequency of 6 Hz may be supplied to the touch electrodes. In this case, the frequencies 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 the touch on the touch panel, or directly transmits the presence and absence of the touch and the position of the 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 frequency of the touch signal to be transmitted for each MUX group, and sets the frequency 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 .

According to the present invention as described above, the frequency band that has the greatest effect on the touch performance of the touch electrodes provided in the MUX group is excluded, and a frequency is selected from the frequency band except for the frequency band, and the selected frequency is used. Thus, a touch signal to be transmitted to the MUX group is generated.

Accordingly, noise of the sensing signals received from the touch electrodes provided in the MUX group may be reduced.

A touch signal having a frequency selected through the above-described process is supplied to each MUX group.

Accordingly, noise of each of the mux groups is reduced, and accordingly, noise deviation between mux groups may be reduced.

Accordingly, the same or similar touch sensitivity can be obtained in the entire touch panel.

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 having different frequencies for each MUX group.

To this end, the touch sensing unit 600 sets a frequency of a touch signal to be transmitted to the MUX groups during a noise analysis period in which the noise analysis signal NAS is received, and a touch signal having a set frequency 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 frequency 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 frequency 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.

In addition, when the receiving unit 630 is connected to the touch electrodes provided in the sixth multiplexer group MUX6G through the switching unit 620 , the receiving unit 630 is connected to 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 40th touch electrodes provided in the first mux group MUX1G are connected to the first to 40th 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 frequency 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-type detection signal into a digital-type detection signal.

The conversion unit 650 , another component of the touch sensing unit 600 , or the control unit 400 , or a separate component, uses digital type sensing signals to generate the touch panel 500 . ), 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 to allow the touch signal supply unit 660 to set the frequency of the touch signals. 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 transmits the frequency of the touch signal to each MUX group. to set Accordingly, the touch signal supply unit 660 sets frequencies of 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 frequencies 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 frequency.

For example, in the noise analysis period, the noise of the mux groups is determined. To this end, a touch signal having the same frequency 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 frequency 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 frequency.

The touch signal supply unit 650 analyzes the raw data, calculates an average value of the 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 frequency 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. In more detail, the touch signal supply unit 650 analyzes the raw data of the MUX group to determine the magnitude of the noise and the frequency band in which the noise is generated. The touch signal supply unit 650 extracts a frequency capable of minimizing noise of the MUX group, and then stores information on the extracted frequency.

The touch signal supply unit 660 generates a touch signal according to the 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 frequencies for each MUX group.

In order to perform the above function, as shown in FIG. 3 , the touch signal supply unit 660 analyzes the raw data received from the reception unit 630 during the noise analysis period, and the MUX group an analysis unit 661 that determines the baselines of the multiplexers, sets the frequencies 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 ) and an output unit 662 for generating a touch signal to be transmitted to the MUX group corresponding to the MUX group selection signal (MSS) transmitted from and outputting the touch signal to the switching unit.

The analyzer 661 sets the frequency 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 frequency 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 frequency. In addition, the analyzer 661 may set the frequency of the touch signals to be transmitted to the mux groups by using the sensing signals received by the touch signals having different frequencies 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 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 frequency of a touch signal to be transmitted to the touch electrodes provided in the MUX group. The analysis unit 661 transmits a frequency control signal FCS 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 frequency control signal FCS transmitted from the analysis unit 661 . Then, 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 frequency to the MUX groups during the noise analysis period.

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

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

4 is an exemplary diagram illustrating a touch synchronization signal input to a touch sensing unit applied to a display device according to the present invention and waveforms of the touch signal.

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

The output unit 662 generates touch signals having different frequencies using the voltage 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 having a frequency corresponding to the information set in the noise analysis period.

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 output unit 662 is supplied to the touch electrodes provided in the MUX group connected to the switching unit 620 .

An example of the touch synchronization signal TSS and the touch signals TS is illustrated in FIG. 4 . In particular, FIG. 4 shows first to sixth touch signals to be transmitted to the first to sixth mux groups MUX1G to MUX6G. That is, in FIG. 4 , a touch signal indicated by MUX1G means a touch signal to be transmitted to the first mux group MUX1G, and a touch signal indicated by MUX6G means a touch signal to be transmitted to the sixth multiplexer group MUX6G.

When a touch sensing period is reached by the touch synchronization signal TSS, the output unit 662 generates touch signals TS having various frequencies, and transmits the generated touch signals TS to the MUX groups. do.

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

In detail, each of the touch signals, as shown in FIG. 4 , includes a plurality of pulses, and includes a first touch signal to be transmitted to the first mux group MUX1G, and a second mux group MUX2G. ), a third touch signal to be transmitted to the third mux group MUX3G, a fourth touch signal to be transmitted to the fourth mux group MUX4G, and a fifth mux group MUX5G. The frequency of the fifth touch signal to be transmitted and the frequency of the sixth touch signal to be transmitted to the sixth multiplexer MUX6G may be different from each other.

However, the frequencies of the first to sixth touch signals do not need to be all different. Accordingly, at least two touch signals may have the same frequency.

5 is a graph showing the sizes of baselines of MUX groups by the display device according to the present invention.

For example, assuming that the baselines of the mux groups measured during the noise analysis period have the values shown in FIG. 1 , among the baselines shown in FIG. 1 , the third mux group MUX3G has the smallest baseline size, and the order of the 4th mux group (MUX4G), the 2nd mux group (MUX2G), the 6th mux group (MUX6G), the 1st mux group (MUX1G), and the 5th mux group (MUX5) This increases the size of the baselines.

The size of the baselines may be proportional to the level of noise, 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 analyzer is configured to generate a second mux group, such that the noise of the first mux group, the second mux group, the fourth mux group, the fifth mux group, and the sixth mux group have the same or similar value as the noise of the third mux group. The frequencies of the touch signals to be transmitted to the 1st MUX group, the 2nd MUX group, the 4th MUX group, the 5th MUX group, and the 6th MUX group are set. As the frequency to be transmitted to the third mux group, the frequency used in the noise analysis period may be applied as it is.

When the touch signals having the frequency set above are transmitted to the first to sixth mux groups, the bases of the first mux group, the second mux group, the fourth mux group, the fifth mux group, and the sixth mux group As shown in FIG. 5 , the size of the line has the same or similar value to the baseline of the third mux group.

When the size of the baselines is the same as or similar to the size of the baseline of the third MUX group, it means that the noise of the MUX groups is reduced, and also that the noise deviation between the MUX groups is small. .

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 frequency 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 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.

The present invention sets the frequency of the touch signals supplied to the mux groups constituting the touch panel for each mux group.

According to the present invention, noise of each of the mux groups may be reduced, noise deviation of the mux groups may be reduced, and thus touch sensitivity may be improved.

In more detail, the present invention analyzes the frequency band of noise affecting each MUX group, and sets the most stable frequency for each MUX group.

Accordingly, the noise of each of the MUX groups may be reduced, and the noise deviation between the MUX groups may be reduced, and thus, the same or similar touch sensitivity may be obtained in the entire touch panel.

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 (5)

a panel having a built-in touch panel including a plurality of touch electrodes; and
and a touch sensing unit sequentially driving the MUX groups divided to include at least two or more touch electrodes among the plurality of touch electrodes;
The touch sensing unit supplies a touch signal having a different frequency to each MUX group, and receives sensing signals from the MUX groups. The method of claim 1,
The touch sensing unit,
a receiving unit for receiving the sensing signal received from the touch panel;
a switching unit sequentially connecting the mux groups to the receiving unit;
In the noise analysis period, the raw data received from the receiver is analyzed, and the frequency of the touch signal to be transmitted to each of the mux groups is set according to the analysis result. In the touch detection period, according to the information set in the noise analysis period, the frequency is set. a touch signal supply unit that generates a touch signal and transmits it to a mux group connected to the switching unit;
a conversion unit converting the sensing signal received from the receiving unit into a digital sensing signal; and
In the noise analysis period, the touch signal supply unit controls the touch signal supply unit to set frequencies of the touch signals, and in the touch sensing period, the touch signal supply unit sequentially outputs a touch signal to the MUX groups. A display device including a touch control unit for controlling the touch signal supply unit to do so. 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, frequencies 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 a 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 is configured to generate, in the touch sensing period, the touch signal having a frequency corresponding to the information set in the noise analysis period.

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