KR102390595B1 - Touch Device And Method Of Driving The Same - Google Patents

Abstract

The present invention provides a timing controller for generating a touch synchronization signal, image data, data control signal, and a gate control signal using an image signal and a plurality of timing signals, and the touch synchronization signal during a main period including consecutive N frames. generates a touch scan signal of one of the first and second frequencies according to a microcomputer that generates the touch scan signal; a data driver that generates a data signal using the image data and the data control signal; a gate driver that generates a gate signal using the gate control signal; and the gate signal. and a touch display panel that displays an image using the data signal and senses a touch using the touch scan signals of the first and second frequencies, respectively, during the main period and the auxiliary period. to provide.

Description

Touch Device And Method Of Driving The Same

The present invention relates to a touch display device, and in particular, a touch display device in which a touch section of a plurality of frames is divided into a main frequency and an auxiliary frequency and driven, thereby removing a noise sensing section of the touch section and improving the accuracy of touch sensing, and the same It is about how to drive.

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 the advantages of thinness, light weight, and low power consumption. ), plasma display panel device (PDP), organic light emitting diode display device (OLED), field emission display device (FED), etc. It is rapidly replacing the cathode ray tube (CRT).

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

The touch display device is used as an output means for displaying an image, and is used as an input means for receiving a user's command by touching a specific part of the displayed image. It can be divided into a decompression method, an electrostatic method, an infrared method, an ultrasonic method, and the like.

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

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

In particular, in recent years, in order to slim down portable terminals such as smartphones and tablet PCs, the electrodes and wires constituting the touch panel are formed on the substrate of the display panel and integrated with the in-cell type touch display device. Demand is increasing.

The in-cell type touch display device divides a time section of one frame into a display section for displaying an image and a touch section for detecting a touch to perform image display and touch sensing, respectively, which will be described with reference to the drawings.

1 is a waveform diagram illustrating a plurality of signals used in a conventional touch display device.

As shown in FIG. 1 , the conventional touch display device generates a touch synchronization signal TSY using a plurality of timing signals transmitted from an external system, and scans a touch using the generated touch synchronization signal TSY. A signal TSS is generated, and a touch is sensed using the generated touch scan signal TSS.

Specifically, the touch synchronization signal TSY has a high level HL during the display period DP in which the touch display panel displays an image during one frame F, and the touch display panel touches the touch display panel during one frame F. It has a rectangular wave shape having a low level LL during the touch period TP in which it is sensed.

The touch scan signal TSS has a constant value of the low level LL during the display period DP, and includes a plurality of pulses that change between the low level LL and the high level HL during the touch period TP. have

In addition, in the conventional touch display device, in order to minimize the interference and distortion of touch sensing such as touch disconnection or touch ghost due to a noise component introduced from the outside, the touch section TP is divided into the normal sensing section NSP and the noise sensing section. It is divided into sections (ASP), and normal touch detection and noise touch detection are performed, respectively.

That is, the conventional touch display device detects a touch using the touch scan signal TSS having the first frequency f1 during the normal sensing period NSP of the touch period TP, and calculates the touch coordinates. Frequency hopping is performed by detecting a noise component using the touch scan signal TSS having a second frequency f2 different from the first frequency f1 during the noise sensing section ASP of the section TP. .

For example, when the conventional touch display device includes the first to sixteenth muxes for transmitting the touch scan signal TSS and the touch detection signal, in the normal sensing period NSP of the touch period TP, Normal touch sensing is performed by sequentially driving the first to sixteenth muxes, and the first to sixteenth muxes are divided into four mux groups in the noise sensing period ASP of the touch period TP. and driving four mux groups during the first to fourth index periods Id1 to Id4, respectively, to perform noise touch detection.

Then, by comparing the touch detection signal of the normal sensing section (NSP) and the noise sensing section (ASP), it is determined whether a noise component is introduced, and the first frequency f1 is hopping to the second frequency f2 according to the determination result. By doing so, interference and distortion of touch sensing due to noise components are minimized.

However, by adding the noise sensing section ASP for detecting a noise component to the normal sensing section NSP for detecting a touch, there is a problem in that the touch section TP increases and the display section DP decreases.

For example, in the index sensing period ISP, the touch scan signal TSS has a second frequency f2 of about 130 kHz and 10 pulses, and is between the first to fourth noise indices Id1 to Id4. When the interval of is about 30 μsec, the index sensing section (ISP) may have a length of about 458 μsec. Since this index sensing section (ISP) is added to the normal sensing section (NSP) to configure the touch section (TP), The display period DP may be reduced by about 458 μsec.

Accordingly, there is a problem in that the quality of the image displayed by the conventional touch display device is deteriorated.

In addition, during the display period DP, the conventional touch display device is driven at a refresh rate, which is a driving frequency for image display, to display an image. When the refresh rate is changed, the touch period TP is further reduced to reduce noise. There is a problem in that a noise component cannot be smoothly detected due to increased restrictions on the use of the sensing section (ASP).

For example, when the conventional touch display device is driven at a refresh rate of about 60 Hz and then at a refresh rate of about 75 Hz, one frame is reduced from about 16.7 msec to about 13.3 msec, and accordingly, the touch period of one frame ( TP) is also decreased, so that the noise sensing section ASP cannot be sufficiently secured, and as a result, the accuracy of detecting noise components may be reduced.

The present invention is proposed to solve this problem, and by driving a plurality of frames by dividing them into a main section and an auxiliary section of different frequencies, the noise sensing section of the touch section is removed, the section for normal touch detection is increased, and the touch An object of the present invention is to provide a touch display device with improved sensing accuracy and a driving method thereof.

In addition, the present invention provides a touch display device and a method for driving the same, in which the accuracy of touch detection is improved and the restriction due to the change of the refresh rate is minimized by performing frequency hopping by comparing the touch detection signals of the main section and the auxiliary section of different frequencies. to provide another purpose.

In order to solve the above problems, the present invention includes a timing controller for generating a touch synchronization signal, image data, data control signal, and a gate control signal using an image signal and a plurality of timing signals, and N consecutive frames. During the main period of generating a touch scan signal of one of the first and second frequencies according to the touch synchronization signal during and a microcomputer generating the touch scan signal of the other one of a second frequency, a data driver generating a data signal using the image data and the data control signal, and generating a gate signal using the gate control signal and a touch display that displays an image using the gate signal and the data signal, and senses a touch using the touch scan signals of the first and second frequencies during the main period and the auxiliary period, respectively. A touch display device including a panel is provided.

The microcomputer unit calculates a touch fluctuation amount from the touch detection signal according to the touch scan signal of the first frequency during the main period, and the touch detection signal according to the touch scan signal of the second frequency during the auxiliary period The touch variation amount is calculated from , and the appropriateness of frequency hopping can be determined using the touch variation amount of the main section and the touch variation amount of the auxiliary section.

In addition, the microcomputer may determine whether a noise component is introduced by comparing the target value with the positive deviation of the amount of touch variation in the main section, and comparing the negative deviation of the amount of touch variation in the main section with the hopping threshold. there is.

And, the microcomputer, when the positive deviation of the touch fluctuation amount of the main section is greater than the target value and the negative deviation of the touch variation amount of the main section is greater than the hopping threshold, the negative of the touch variation amount of the auxiliary section It is possible to determine the appropriateness of the frequency hopping by comparing the deviation of ? and the hopping threshold.

In addition, the microcomputer may generate the touch scan signal of the second frequency during the main period when the negative deviation of the touch fluctuation amount in the sub section is smaller than the hopping threshold, and generate the touch scan signal of the first frequency during the sub section. of the touch scan signal may be generated.

And, the microcomputer, when the positive deviation of the amount of touch fluctuation in the main section is less than or equal to the target value, or when the negative deviation of the amount of touch variation in the main section is less than or equal to the hopping threshold, the main The touch scan signal of the first frequency may be generated during the period, and the touch scan signal of the second frequency may be generated during the auxiliary period.

On the other hand, the present invention includes the steps of: a timing control unit generating a touch synchronization signal, image data, data control signal, and a gate control signal using an image signal and a plurality of timing signals; and a microcomputer unit, including consecutive N frames During the main period of generating a touch scan signal of one of the first and second frequencies according to the touch synchronization signal during and generating the touch scan signal of the other one of a second frequency; generating, by a data driver, a data signal using the image data and the data control signal; generating a gate signal by using a touch display panel, displaying an image using the gate signal and the data signal, and performing the touch scan at the first and second frequencies during the main period and the auxiliary period, respectively Provided is a method of driving a touch display device comprising the step of sensing a touch using a signal.

And, the driving method of the touch display device includes the steps of: calculating, by the microcomputer, a touch variation amount from a touch detection signal according to the touch scan signal of the first frequency during the main period; calculating the touch fluctuation amount from the touch detection signal according to the touch scan signal of can do.

In addition, the step of determining the adequacy of the frequency hopping by the microcomputer may include comparing, by the microcomputer, a deviation of the amount of the touch variation in the main section with a target value, and, by the microcomputer, the touch variation in the main section. It may include comparing the negative deviation of the hopping threshold value.

And, in the driving method of the touch display device, when the positive deviation of the touch fluctuation amount in the main section is greater than the target value and the negative deviation of the touch fluctuation amount in the main section is greater than the hopping threshold, the microcomputer unit, The method may further include comparing a negative deviation of the touch variation in the auxiliary section with the hopping threshold.

In addition, in the driving method of the touch display device, when the negative deviation of the touch variation amount in the auxiliary section is smaller than the hopping threshold, the microcomputer generates the touch scan signal of the second frequency during the main section. and generating, by the microcomputer, the touch scan signal of the first frequency during the auxiliary period.

In the present invention, by dividing a plurality of frames into a main section and an auxiliary section of different frequencies, the noise sensing section of the touch section is removed, so that the section for normal touch sensing is increased and the accuracy of touch sensing is improved. .

In addition, the present invention has the effect of improving the accuracy of touch sensing and minimizing the restriction due to the change of the refresh rate by performing frequency hopping by comparing the touch sensing signals of the main section and the sub section of different frequencies.

1 is a waveform diagram showing a plurality of signals used in a conventional touch display device.
2 is a view showing a touch display device according to an embodiment of the present invention.
3 is a waveform diagram illustrating a plurality of signals used in a touch display device according to an embodiment of the present invention.
4 is a flowchart illustrating a method of driving a touch display device according to an embodiment of the present invention;
5 is a view for explaining a criterion for determining normal touch detection and noise touch detection of a touch display device according to an embodiment of the present invention;

Hereinafter, a touch display device and a driving method thereof according to the present invention will be described with reference to the accompanying drawings.

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

As shown in FIG. 2 , the touch display device 110 according to the embodiment of the present invention includes a timing control unit 120 , a microcontroller unit (MCU) unit 130 , a data driving unit 140 , and a gate driving unit ( 150) and a touch display panel 160, wherein the touch display device 110 is an organic light emitting diode display device (OLED display device) or a liquid crystal display device (LCD device). can be

The touch display device 110 divides the time period of one frame into a display period for displaying an image (DP in FIG. 3 ) and a touch period for detecting a touch (TP in FIG. 3 ) to perform image display and touch detection, respectively. During the display period DP, a gate signal and a data signal are respectively applied to the gate wiring GL and the data line DL of the touch display panel 160 to display an image, and during the touch period TP, the touch display panel A touch is sensed by applying the touch scan signal TSS to the touch wiring TL of 160 and reading the touch sensing signal of the touch wiring TL of the touch display panel 160 .

The timing controller 120 includes an image signal IS, a data enable signal DE, a horizontal synchronization signal HSY, and a vertical synchronization signal VSY, transmitted from an external system (not shown) such as a graphic card or a TV system. , the clock CLK and the like to generate a touch synchronization signal TSY, image data RGB, a data control signal DCS, and a gate control signal GCS, and the generated touch synchronization signal ( TSY) is transmitted to the microcomputer 130 , the generated image data RGB and the data control signal DCS are transmitted to the data driver 140 , and the generated gate control signal GCS is transmitted to the gate driver 150 . forward to

The microcomputer 130 generates a touch scan signal TSS by using the touch synchronization signal TSY transmitted from the timing controller 120 , and transmits the generated touch scan signal TSS to the data driver 140 . and analyzes the touch sensing signal transmitted from the data driver 140 to determine whether or not there is a touch.

For example, the microprocessor 130 refers to a computer in which a microprocessor and an input/output module are made of a single chip to perform a predetermined function, and includes a central processing unit (CPU), memory, and programmable input/output. may include

In particular, the microcomputer 130 divides a plurality of frames into a main section (MP in FIG. 3) and an auxiliary section (AP in FIG. 3), and in the touch section TP of each frame in the main section MP, A touch scan signal TSS having one frequency (f1 in FIG. 3) as the main frequency is generated, and in the touch period TP of each frame of the auxiliary period AP, a second frequency ( A touch scan signal TSS having f2 of FIG. 3 as an auxiliary frequency may be generated.

For example, the first and second frequencies f1 and f2 may be 94 kHz and 130 kHz, respectively.

And, the microcomputer 130, the touch sensing signal according to the touch scan signal TSS having the first frequency f1 of the touch period TP of each frame of the main period MP and the auxiliary period AP The touch detection signal according to the touch scan signal TSS having the second frequency f2 of the touch section TP of each frame is compared to determine whether a noise component is introduced, and the first frequency f1 according to the determination result Frequency hopping to the second frequency f2 may be determined.

Such frequency hopping will be described in detail later.

The data driver 140 generates a data signal (data voltage) using the data control signal DCS and the image data RGB transmitted from the timing controller 120 , and applies the generated data signal to the touch display panel 160 . ) to the data line (DL).

And, the data driver 140 applies the touch scan signal TSS transmitted from the microcomputer 130 to the touch wiring TL of the touch display panel 160, and the touch wiring according to the touch scan signal TSS. The touch detection signal of (TL) is read out, and the read touch detection signal is transmitted to the microcomputer 130 .

The gate driver 150 generates a gate signal (gate voltage) using the gate control signal GCS transmitted from the timing controller 120 , and applies the generated gate signal to the gate wiring GL of the touch display panel 160 . ) is approved.

The gate driving unit 150 includes a gate-in-panel formed together on a substrate of the touch display panel 160 on which the gate wiring GL, the data line DL, the touch wiring TL, and the pixel P are formed. gate in panel: GIP) type.

The touch display panel 160 displays an image using a gate signal and a data signal, and senses a touch using a touch scan signal and a touch detection signal, and a gate wiring GL that crosses each other to define the pixel P. ) and a data line DL, a pixel P connected to the gate line GL and the data line DL, and a touch line TL spaced apart in parallel to the data line DL.

When the touch display device 110 is an organic light emitting diode display device, the pixel P of the touch display panel 160 may include a switching thin film transistor, a driving thin film transistor, a storage capacitor, and a light emitting diode, and the touch display device 110 ) is a liquid crystal display device, the pixel P of the touch display panel 160 may include a thin film transistor, a storage capacitor, and a liquid crystal capacitor.

As described above, the touch display device 110 according to the embodiment of the present invention displays an image using a gate signal and a data signal, senses a touch using a touch scan signal TSS and a touch detection signal, and in particular Whether or not a noise component is introduced is determined using the touch sensing signals of the main section MP and the auxiliary section AP, which will be described with reference to the drawings.

3 is a waveform diagram illustrating a plurality of signals used in a touch display device according to an embodiment of the present invention, which will be described with reference to FIG. 2 .

3 , in the touch display device 110 according to the embodiment of the present invention, the timing controller 120 generates a touch synchronization signal TSY by using a plurality of timing signals transmitted from an external system. and transmits the generated touch synchronization signal TSY to the microcomputer 130, the microcomputer 130 generates a touch scan signal TSS using the touch synchronization signal TSY, and the generated touch scan The signal TSS is transmitted to the data driver 140 .

Specifically, the touch synchronization signal TSY has a high level HL during the display period DP in which the touch display panel 160 displays an image, and the touch period in which the touch display panel 160 detects a touch ( TP) has a rectangular wave shape with a low level LL.

The touch scan signal TSS has a constant value of the low level LL during the display period DP, and includes a plurality of pulses that change between the low level LL and the high level HL during the touch period TP. have

In particular, the microcomputer 130 divides a plurality of frames into a main section MP and an auxiliary section AP, and selects the first frequency f1 in the touch section TP of each frame of the main section MP. A touch scan signal TSS is generated and normal touch detection is performed using the generated touch scan signal TSS of the first frequency f1, and in the touch section TP of each frame of the auxiliary section AP, A touch scan signal TSS having a second frequency f2 different from the first frequency f1 is generated, and noise touch detection can be performed using the generated touch scan signal TSS of the second frequency f2. there is.

And, the microcomputer 130, the touch detection signal corresponding to the first frequency f1 by performing the normal touch detection in the main section MP and the second frequency (by performing the noise touch detection in the auxiliary section AP) By comparing the touch sensing signal corresponding to f2), it is determined whether a noise component is introduced, and frequency hopping from the first frequency f1 to the second frequency f2 may be determined according to the determination result.

For example, when the touch display device 110 displays an image at a refresh rate of 60 Hz, the main section MP of four consecutive frames and the auxiliary section AP of one frame immediately thereafter are repeated to 1 60 frames that make up a second can be configured.

That is, the touch scan signal TSS has a first frequency f1 during the touch period TP of the first to fourth frames F1 to F4, respectively, and the touch period TP of the fifth frame F5. It may have a second frequency f2 during the period.

3 shows a case where the first frequency f1 is smaller than the second frequency f2, the touch scan signal TSS of the first frequency f1 in the touch section TP of the main section MP It shows that the output period of is longer than the output period of the touch scan signal TSS of the second frequency f2 in the touch period TP of the auxiliary period AP.

Accordingly, 48 frames out of 60 frames constituting 1 second are divided into a main section MP including a touch section TP using the touch scan signal TSS of the first frequency f1, and the remaining 12 Each frame may be divided into an auxiliary period AP including a touch period TP using the touch scan signal TSS of the second frequency f2.

In the embodiment of the present invention, it is exemplified that 12 frames out of 60 frames constituting 1 second are divided into an auxiliary section AP corresponding to the second frequency f2 and noise touch detection, but in another embodiment, 1 second Of the 60 frames constituting the second, 10 or more frames may be divided into a second frequency f2 and an auxiliary period AP corresponding to noise touch detection.

That is, in another embodiment, 10 frames out of 60 frames constituting 1 second by repeating the main section (MP) of five consecutive frames and the sub section (AP) of one frame immediately thereafter are selected as the sub section ( AP), or by repeating the main section (MP) of three consecutive frames and the sub section (AP) of one frame immediately after that, 15 frames out of 60 frames constituting 1 second are divided into the sub section (AP). ) can be distinguished.

As described above, in the touch display device 110 according to the embodiment of the present invention, instead of dividing the touch section TP of one frame into a normal sensing section and a noise sensing section, 60 frames constituting 1 second are displayed. It is divided into a main section MP of three to five consecutive frames and an auxiliary section AP of one frame immediately thereafter, and in the touch section TP of the main section MP, the first frequency f1 is Normal touch sensing is performed using the touch scan signal TSS, and noise touch sensing is performed using the touch scan signal TSS of the second frequency f2 in the touch section TP of the auxiliary section AP. , frequency hopping from the first frequency f1 to the second frequency f2 may be performed according to the comparison result of the touch detection signal of the normal touch detection and the touch detection signal of the noisy touch detection.

Since a separate section for detecting a noise component is not added to the touch section TP of the main section MP and the touch section TP of the auxiliary section AP, a section for normal touch detection can be sufficiently secured. As a result, the accuracy of touch detection is improved, and restrictions due to the change of the refresh rate are minimized.

A process of determining whether a noise component is introduced in the touch display device 110 will be described with reference to the drawings.

4 is a flowchart for explaining a method of driving a touch display device according to an embodiment of the present invention, and FIG. 5 is a reference for determining a normal touch detection and a noisy touch detection of the touch display device according to an embodiment of the present invention For the drawings, it will be described with reference to FIGS. 2 and 3 together.

As shown in FIG. 4 , the touch display device 110 according to the embodiment of the present invention includes a touch scan signal ( TSS) to perform normal touch sensing, and noise touch sensing is performed using the touch scan signal TSS having a second frequency f2 that is an auxiliary frequency during the touch period TP of the auxiliary period AP. (st110).

Specifically, the touch display device 110 responds to the touch scan signal TSS of the first and second frequencies f1 and f2 during the touch period TP of the main period MP and the auxiliary period AP, respectively. A touch variation TC is calculated from the touch sensing signal, and the touch variation TC may be a capacitance variation.

As shown in FIG. 5 , the touch variation TC has a value between the maximum intensity Imax and the minimum intensity Imin proportional to the touch input, and has a positive deviation Dp or negative value based on 0. It is represented by the deviation (Dn).

In a steady state in which no noise component is introduced, the touch variation TC when there is a touch input has a relatively large positive deviation Dp, and the touch variation TC when there is no touch input is relatively It may have a small positive deviation (Dp) or a negative deviation (Dn).

For example, if there is a touch input in a normal state, the touch variation TC may be +60, and if there is no touch input in the normal state, the touch variation TC may be -4 to +4.

In a noise state in which a noise component is introduced, the touch variation TC when there is a touch input has a relatively large negative deviation Dp, and the touch variation TC when there is no touch input is relatively small. The value may have a positive deviation (Dp) or a negative deviation (Dn).

That is, the touch fluctuation amount TC has a relatively large deviation Dp when there is a touch input in the normal state, becomes substantially 0 when there is no touch input in the normal state, and is In the case of having a relatively large negative deviation (Dn), it may be substantially 0 when there is no touch input in a noise state.

Accordingly, using the touch variation TC when there is a touch input in the touch section TP of the main section MP and the auxiliary section AP, a steady state in which a noise component is not introduced or a noise in which a noise component is introduced The state can be determined, and when it is determined as a noise state, the first and second using the touch detection signal and the touch variation TC according to the touch scan signal TSS of the first and second frequencies f1 and f2 Frequency hopping, which is a switch between frequencies f1 and f2, can be performed.

Specifically, in a steady state in which no noise component is introduced, the touch fluctuation amount TC may have a value less than the target value Itg. Itg), it is possible to determine whether the steady state or abnormal state and noise components are introduced.

The target value Itg corresponds to the average of the touch fluctuation amount TC by the touch input in a normal state. Since it may vary according to the position of the touch input or the frequency of the touch scan signal TSS, the target value Itg is normalized. By setting it to a normalized value, fluctuations can be minimized.

And, in the noise state where the noise component is introduced, the touch variation TC may have a value exceeding the hopping threshold Iht. The first frequency ( It is possible to determine the adequacy of frequency hopping from f1) to the second frequency f1.

The hopping threshold Iht corresponds to a level that can tolerate the adverse effects of the noise component, and may be determined according to the specification of the touch display device 110 .

Again, referring to FIG. 4 , after performing normal touch detection and noise touch detection (st110), in order to determine whether a noise component is introduced, the amount of touch variation in the main section MP corresponding to the first frequency f1 ( The magnitude of the positive deviation Dp of TC) and the target value Itg are compared, and the negative deviation Dn of the touch fluctuation amount TC of the main section MP corresponding to the first frequency f1 and the hopping threshold value are compared. The magnitude of (Iht) is compared (st112).

As a result of the comparison, the positive deviation Dp of the touch fluctuation amount TC of the main section MP is greater than the target value Itg, and the negative deviation Dn of the touch fluctuation amount TC of the main section MP is the hopping threshold. If it is greater than (Iht) (YES), it may be determined that the touch display device 110 has an abnormal state in which a noise component is introduced.

As a result of comparison, when the positive deviation Dp of the touch fluctuation amount TC of the main period MP is less than or equal to the target value Itg, or the negative deviation Dn of the touch fluctuation amount TC of the main period MP ) is less than or equal to the hopping threshold Iht (NO), it may be determined that the touch display device 110 has a steady state in which no noise component is introduced.

Thereafter, the positive deviation Dp of the touch fluctuation amount TC of the main period MP is greater than the target value Itg, and the negative deviation Dn of the touch fluctuation amount TC of the main period MP becomes the hopping threshold ( Iht) (if it is determined that the noise component is in an abnormal state) (YES in st112), the amount of touch variation in the auxiliary section AP corresponding to the second frequency f2 in order to determine the appropriateness of frequency hopping The magnitude of the negative deviation Dn of (TC) and the hopping threshold Iht are compared (st114).

As a result of comparison, when the negative deviation Dn of the touch variation TC of the auxiliary section AP is smaller than the hopping threshold Iht, frequency hopping from the first frequency f1 to the second frequency f2 is considered appropriate. You can judge (YES).

As a result of comparison, when the negative deviation Dn of the touch variation TC of the auxiliary section AP is greater than or equal to the hopping threshold Iht, frequency hopping from the first frequency f1 to the second frequency f2 is It can be judged as inappropriate (NO).

On the other hand, when the positive deviation Dp of the touch fluctuation amount TC of the main period MP is less than or equal to the target value Itg, or the negative deviation Dn of the touch fluctuation amount TC of the main period MP is less than or equal to the hopping threshold (Iht) (when it is determined that a steady state in which no noise component is introduced) (NO in st112), frequency hopping is not performed and the first and second frequencies f1 and f2 are Touch sensing is continuously performed by maintaining the main frequency for the main section MP and the auxiliary frequency for the sub section AP, respectively (st116).

And, when the negative deviation Dn of the touch variation amount TC of the auxiliary section AP is greater than or equal to the hopping threshold Iht (frequency hopping from the first frequency f1 to the second frequency f2 is appropriate) (NO in st114), frequency hopping is not performed, and the first and second frequencies f1 and f2 are set as the main frequency for the main section MP and the auxiliary frequency for the auxiliary section AP, respectively. to continuously perform touch sensing (st116).

Thereafter, when the negative deviation Dn of the touch variation amount TC of the auxiliary section AP is smaller than the hopping threshold Iht (frequency hopping from the first frequency f1 to the second frequency f2 is judged to be appropriate) (YES in st114), frequency hopping is performed to convert the second and first frequencies f2 and f1 to the main frequency for the main section MP and the auxiliary frequency for the sub section AP, respectively, to detect touch. carry out (st118).

In the embodiment of the present invention, frequency hopping is performed by setting two different frequencies f1 and f2 as the main frequency and the auxiliary frequency, but in another embodiment, two of three different frequencies are sequentially performed. Frequency hopping may be performed by setting the main frequency and the auxiliary frequency.

As described above, in the touch display device 110 according to the embodiment of the present invention, instead of dividing the touch section TP of one frame into a normal sensing section and a noise sensing section, 60 frames constituting 1 second are displayed. It is divided into a main section MP of three to five consecutive frames and an auxiliary section AP of one frame immediately thereafter, and in the touch section TP of the main section MP, the first frequency f1 is Normal touch sensing is performed using the touch scan signal TSS, and noise touch sensing is performed using the touch scan signal TSS of the second frequency f2 in the touch section TP of the auxiliary section AP. , between the first and second frequencies f1 and f2 according to the comparison result between the touch variation amount TC calculated from the touch detection signal of normal touch detection and noise touch detection, and the target value Itg and the hopping threshold Iht. Frequency hopping can be performed.

That is, since a separate section for detecting a noise component is not added to the touch section TP of the main section MP and the touch section TP of the auxiliary section AP, the touch section TP for touch sensing is sufficiently provided. It can be secured for a long time, and as a result, the accuracy of touch detection is improved, and the restriction due to the change of the refresh rate is minimized.

Although the above has been described with reference to the preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention described in the claims below You will understand that it can be done.

110: touch display device 120: timing control unit
130: microcomputer 140: data driving unit
150: gate driver 160: touch display panel
MP: Main section AP: Sub section
DP: Display section TP: Touch section

Claims (13)

a timing controller for generating a touch synchronization signal, image data, a data control signal, and a gate control signal by using the image signal and a plurality of timing signals;
During a main period including successive first to Nth frames, a touch scan signal of one of the first and second frequencies is generated according to the touch synchronization signal, and the (N+1)th frame immediately after the Nth frame is generated. a microcomputer for generating the touch scan signal of the other one of the first and second frequencies according to the touch synchronization signal during an auxiliary period including;
a data driver for generating a data signal using the image data and the data control signal;
a gate driver for generating a gate signal using the gate control signal;
A touch display panel that displays an image using the gate signal and the data signal, and senses a touch using the touch scan signals of the first and second frequencies, respectively, during the main period and the auxiliary period
including,
The first to Nth frames of the main section and the (N+1)th frame of the auxiliary section are respectively divided into a display section and a touch section,
The touch display panel detects a touch using a touch sensing signal according to the touch scan signal of the first frequency in the entire touch period of each of the first to Nth frames of the main period, A touch display device for sensing a touch using the touch sensing signal according to the touch scan signal of the second frequency in the entire touch section of the (N+1)th frame.
The method of claim 1,
The microcomputer unit,
Calculating a touch variation amount from a touch sensing signal according to the touch scan signal of the first frequency during the main period,
calculating the touch variation amount from the touch sensing signal according to the touch scan signal of the second frequency during the auxiliary period;
A touch display device for determining appropriateness of frequency hopping by using the touch variation amount of the main section and the touch variation amount of the auxiliary section.
3. The method of claim 2,
The microcomputer unit,
Comparing the deviation of the amount of the touch variation in the main section with the target value,
By comparing the negative deviation of the touch variation in the main section with the hopping threshold,
A touch display device that determines whether a noise component is introduced.
4. The method of claim 3,
The microcomputer unit,
The deviation of the amount of the touch variation in the main section is greater than the target value,
When the negative deviation of the touch variation in the main section is greater than the hopping threshold,
By comparing the negative deviation of the touch variation in the auxiliary section with the hopping threshold,
A touch display device for determining the appropriateness of the frequency hopping.
5. The method of claim 4,
The microcomputer unit,
When the negative deviation of the touch variation in the auxiliary section is smaller than the hopping threshold,
generating the touch scan signal of the second frequency during the main period;
A touch display device for generating the touch scan signal of the first frequency during the auxiliary period.
4. The method of claim 3,
The microcomputer unit,
If the deviation of the amount of touch variation in the main section is less than or equal to the target value,
When the negative deviation of the touch variation in the main section is less than or equal to the hopping threshold,
generating the touch scan signal of the first frequency during the main period,
A touch display device for generating the touch scan signal of the second frequency during the auxiliary period.
generating, by a timing controller, a touch synchronization signal, image data, a data control signal, and a gate control signal using the image signal and a plurality of timing signals;
The microcomputer generates a touch scan signal of one of the first and second frequencies according to the touch synchronization signal during a main period including successive first to Nth frames, and (N+1)th immediately after the Nth frame. ) generating the touch scan signal of the other one of the first and second frequencies according to the touch synchronization signal during an auxiliary period including a frame;
generating, by a data driver, a data signal using the image data and the data control signal;
generating, by a gate driver, a gate signal using the gate control signal;
displaying, by a touch display panel, an image using the gate signal and the data signal, and detecting a touch using the touch scan signals of the first and second frequencies, respectively, during the main period and the auxiliary period;
including,
The first to Nth frames of the main section and the (N+1)th frame of the auxiliary section are respectively divided into a display section and a touch section,
The touch display panel detects a touch using a touch sensing signal according to the touch scan signal of the first frequency in the entire touch period of each of the first to Nth frames of the main period, A method of driving a touch display device for sensing a touch using the touch sensing signal according to the touch scan signal of the second frequency in the entire touch section of the (N+1)th frame.
8. The method of claim 7,
The microcomputer unit,
calculating a touch variation amount from a touch sensing signal according to the touch scan signal of the first frequency during the main period;
calculating the touch variation amount from the touch sensing signal according to the touch scan signal of the second frequency during the auxiliary period;
Determining the appropriateness of frequency hopping using the touch variation amount of the main section and the touch variation amount of the auxiliary section
A method of driving a touch display device further comprising a.
9. The method of claim 8,
The step of determining, by the microcomputer, the appropriateness of the frequency hopping,
comparing, by the microcomputer, a difference in the amount of the touch variation in the main section with a target value;
Comparing, by the microcomputer, a negative deviation of the touch variation in the main section with a hopping threshold
A method of driving a touch display device comprising a.
10. The method of claim 9,
The deviation of the amount of the touch variation in the main section is greater than the target value,
When the negative deviation of the touch variation in the main section is greater than the hopping threshold,
Comparing, by the microcomputer, the negative deviation of the touch variation in the auxiliary section with the hopping threshold
A method of driving a touch display device further comprising a.
11. The method of claim 10,
When the negative deviation of the touch variation in the auxiliary section is smaller than the hopping threshold,
generating, by the microcomputer, the touch scan signal of the second frequency during the main period;
generating, by the microcomputer, the touch scan signal of the first frequency during the auxiliary period
A method of driving a touch display device further comprising a. The method of claim 1,
The microcomputer unit,
Calculating a touch variation amount from a touch detection signal according to the touch scan signal of the first frequency during the main period,
calculating the touch variation amount from the touch sensing signal according to the touch scan signal of the second frequency during the auxiliary period;
The positive deviation of the touch variation in the main section is greater than the target value, the negative deviation of the touch variation in the main section is greater than the hopping threshold, and the negative deviation of the touch variation in the auxiliary section is smaller than the hopping threshold. In this case, it is determined that frequency hopping is appropriate, and the touch display device generates the touch scan signal of the second frequency during the main period and generates the touch scan signal of the first frequency during the auxiliary period.
13. The method of claim 12,
The main period further includes consecutive (N+2)th to (2N+1)th frames immediately after the (N+1)th frame, and the auxiliary period includes a (2N+1)th frame immediately after the (2N+1)th frame. (2N+2) further comprising a frame,
The (N+2) to (2N+1)th frames of the main section and the (2N+2)th frame of the auxiliary section are divided into a display section and a touch section, respectively,
The touch display panel is touched using a touch detection signal according to the touch scan signal of the second frequency in the entire touch period of each of the (N+2)th to (2N+1)th frames of the main period. and sensing a touch using the touch detection signal according to the touch scan signal of the first frequency in the entire touch period of the (2N+2)th frame of the auxiliary period.

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