KR102296399B1 - Touch Display Device And Method Of Driving The Same - Google Patents

Abstract

The present invention relates to a touch display device capable of improving touch sensing performance by varying a touch driving time for each multiplexer according to the presence or absence of a touch, and a method of driving the same.
In the method of driving a touch display device according to an embodiment of the present invention, a plurality of multiplexers are sequentially driven for the same time in a first touch driving period of one frame period, and a touch driving signal is supplied to all touch electrodes arranged on the touch display panel. do. Thereafter, the amount of charge of all the touch electrodes is sensed to detect the presence and the position of the touch, and the driving time is varied for each of the plurality of multiplexers according to the presence or absence of the touch.

Description

Touch Display Device And Method Of Driving The Same

The present invention relates to a touch display device capable of improving touch sensing performance by varying a touch driving time for each multiplexer according to the presence or absence of a touch, and a method of driving the same.

As an input device of a liquid crystal display device, a touch panel through which a user can directly input information to a screen using a finger or a pen is applied to replace an input device such as a mouse or a keyboard that has been conventionally applied. The application of such a touch panel is expanding due to the advantage that anyone can easily operate it.

The touch panel can be divided into a resistive type, a capacitive type, and an infrared sensing prevention type according to a touch sensing method. Recently, a capacitive type having advantages in manufacturing method convenience and sensing sensitivity, etc. is attracting attention. The capacitive touch panel is divided into a mutual capacitance method and a self capacitance method.

Recently, in applying a touch screen to a liquid crystal display device, an in cell touch method in which a capacitive touch sensor is built in a liquid crystal panel for slimming has been developed. In the following description, a touch display panel means that a touch sensor is built into the liquid crystal panel.

1 is a diagram schematically showing a touch display device according to the prior art, and FIG. 2 is a diagram showing a display and a touch driving method of the touch display device according to the related art.

1 and 2 , a plurality of pixels are arranged in a touch display device 1 according to the related art, and each touch electrode 10 is configured in units of a predetermined number of pixels to sense a touch. In this case, the plurality of touch electrodes 10 are configured by patterning the common electrode.

The touch display device 1 according to the prior art divides one frame period into a display period and a touch period, and performs display driving and touch driving in a time division manner. In this case, in order to increase the touch sensing performance, the display driving is performed at 60 Hz, and the touch driving is performed at 120 Hz.

In the display period, a data voltage is supplied to the pixel electrodes and a common voltage Vcom is supplied to the plurality of touch electrodes 10 to display an image. In the touch period, the touch driver supplies a touch driving signal to each touch electrode 10 , and then senses the charged capacitance of each touch electrode 10 to sense the presence or absence of a touch and the touch position.

When half memory is applied, after half of pixels among all pixels emit light within one frame, all touch electrodes are touch-driven. After that, after the remaining 1/2 pixels emit light, all touch electrodes are touch-driven.

During touch driving, a plurality of multiplexers are used to reduce the number of channels of the touch driver, and touch driving is sequentially performed for each of the plurality of multiplexers. In this case, the touch driving time allocated to each of the plurality of multiplexers is the same.

Such a touch display device according to the related art has a shorter touch driving time compared to an add-on type touch panel because the display period and the touch period are time-divisionally driven. In order to increase the touch sensing performance, it is necessary to secure more touch driving time. However, if the touch driving time is increased, the display driving time is relatively reduced, and thus display quality is deteriorated. Therefore, there is a limit in securing the touch driving time.

SUMMARY OF THE INVENTION The present invention is to solve the above-described problems, and an object of the present invention is to provide a touch display device capable of improving touch sensing performance and a method of driving the same.

An object of the present invention is to provide a touch display device capable of improving touch sensing performance by further securing a touch driving time, and a driving method thereof, in order to solve the above-described problems.

In addition to the technical problems of the present invention mentioned above, other features and advantages of the present invention will be described below or will be clearly understood by those skilled in the art from such description and description.

In order to achieve the technical problem described above, in the method of driving a touch display device according to a first embodiment of the present invention, a plurality of multiplexers are sequentially driven for the same time in a first touch driving period of one frame period to generate a touch driving signal. It supplies all the touch electrodes arranged on the touch display panel. Thereafter, the amount of charge of all the touch electrodes is sensed to detect the presence and the position of the touch, and the driving time is varied for each of the plurality of multiplexers according to the presence or absence of the touch.

In the method of driving the touch display apparatus according to the first embodiment of the present invention, the driving time of one or a plurality of multiplexers corresponding to a sensing region in which a touch is detected among the plurality of multiplexers is increased during the first touch driving period. Then, a touch driving signal is supplied to the plurality of touch electrodes disposed in the sensing region where the touch is detected.

In the method of driving a touch display device according to the first embodiment of the present invention, in the first touch driving period, the amount of charges of a plurality of touch electrodes disposed in a sensing area corresponding to a multiplexer having an increased driving time is accumulated to determine whether or not there is a touch. detect the position.

In the method of driving a touch display device according to the second embodiment of the present invention, a plurality of multiplexers are sequentially driven for the same time in a first touch driving period of one frame period to apply a touch driving signal to all touch electrodes arranged on the touch display panel. supply to Then, the presence or absence of a touch and a position are detected by sensing the amount of charge of all the touch electrodes. In the second touch driving period, the driving time is varied for each of the plurality of multiplexers according to the detection result of the presence or absence of the touch and the position. Then, each of the plurality of multiplexers is driven with a variable driving time to supply a touch driving signal to all the touch electrodes.

In the method of driving a touch display device according to the second embodiment of the present invention, the driving time of one or a plurality of multiplexers corresponding to a sensing region in which a touch is detected among the plurality of multiplexers is increased during the second touch driving period. In addition, the driving time of one or a plurality of multiplexers corresponding to the remaining sensing regions in which a touch is not detected is reduced.

In the method of driving a touch display device according to a second embodiment of the present invention, in the second touch driving period, the amount of charges of a plurality of touch electrodes disposed in a sensing region corresponding to a multiplexer having an increased driving time is accumulated to determine whether or not there is a touch. detect the position.

A touch display device according to an embodiment of the present invention includes a touch display panel on which a plurality of touch electrodes are disposed, and a plurality of multiplexers for supplying a touch driving signal by dividing the plurality of touch electrodes. The driving time of each of the plurality of multiplexers is varied according to the touch sensing result of the first touch driving period of one frame period. Then, each of the plurality of multiplexers is driven for a variable driving time to supply a touch driving signal to all touch electrodes or to supply a driving signal to a plurality of touch electrodes disposed in a sensing region where a touch is detected.

The touch display device and the driving method thereof according to an embodiment of the present invention can improve touch sensing performance by varying the touch driving time for each multiplexer according to the presence or absence of a touch.

The touch display device and the driving method thereof according to an embodiment of the present invention can improve the touch sensing performance by increasing the touch driving time of the multiplexer corresponding to the touched area.

In addition, other features and advantages of the present invention may be newly recognized through embodiments of the present invention.

1 is a diagram schematically illustrating a touch display device according to the related art.
2 is a diagram illustrating a display and a touch driving method of a touch display device according to the related art.
3 is a diagram schematically illustrating a touch display device according to an embodiment of the present invention.
4 is a diagram illustrating that a plurality of multiplexers are disposed in a touch driver, and a touch sensing area is divided for each of the plurality of multiplexers.
5 to 7 are diagrams illustrating a method of driving a touch display device according to a first embodiment of the present invention.
8 to 10 are diagrams illustrating a method of driving a touch display device according to a second embodiment of the present invention.
11 to 13 are diagrams illustrating a method of driving a touch display device according to a third embodiment of the present invention.
14 to 16 are diagrams illustrating a method of driving a touch display device according to a fourth embodiment of the present invention.
17 to 19 are diagrams illustrating a method of driving a touch display device according to a fifth embodiment of the present invention.

Like reference numerals refer to substantially identical elements throughout. In the following description, detailed descriptions of configurations and functions known in the art and cases not related to the core configuration of the present invention may be omitted. The meaning of the terms described herein should be understood as follows.

Advantages and features of the present invention, and a method for achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the present invention is only defined by the scope of the claims.

It should be noted that, in the present specification, in adding reference numbers to the components of each drawing, the same numbers are used for the same components, even if they are indicated on different drawings, as much as possible.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining the embodiments of the present invention are exemplary, and thus the present invention is not limited to the illustrated matters. Like reference numerals refer to like elements throughout. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, the case in which the plural is included is included unless otherwise explicitly stated.

In interpreting the components, it is interpreted as including an error range even if there is no separate explicit description.

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between the two parts unless 'directly' is used.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal relationship is described with 'after', 'following', 'after', 'before', etc. It may include cases that are not continuous unless this is used.

The term 'at least one' should be understood to include all possible combinations from one or more related items. For example, the meaning of 'at least one of the first item, the second item and the third item' means not only the first item, the second item, or the third item, respectively, but also two of the first item, the second item and the third item. It means a combination of all items that can be presented from more than one.

Although the first, second, etc. are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present invention.

Each feature of the various embodiments of the present invention can be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each embodiment may be independently implemented with respect to each other or implemented together in a related relationship. may be

Liquid crystal display devices have been developed in various ways, such as TN (Twisted Nematic) mode, VA (Vertical Alignment) mode, IPS (In Plane Switching) mode, FFS (Fringe Field Switching) mode, etc. according to a method of controlling the arrangement of liquid crystal layers.

Among them, the TN mode and the VA mode are methods in which a pixel electrode is formed on a lower substrate and a common electrode is formed on an upper substrate (color filter array substrate) to control the arrangement of liquid crystal layers through a vertical electric field.

Meanwhile, in the IPS mode and the FFS mode, the arrangement of the liquid crystal layer is controlled by an electric field between the pixel electrode and the common electrode by disposing a pixel electrode and a common electrode on a lower substrate.

In the IPS mode, the arrangement of the liquid crystal layer is controlled by generating a horizontal electric field between both electrodes by alternately arranging the pixel electrode and the common electrode in parallel.

In the FFS mode, the pixel electrode and the common electrode are formed to be spaced apart from each other with an insulating layer interposed therebetween. At this time, one electrode is configured in a plate shape or pattern and the other electrode is configured in a finger shape to control the arrangement of the liquid crystal layer through a fringe field generated between both electrodes. method.

In the touch panel according to an embodiment of the present invention, both a vertical electric field method (TN mode, VA mode) and a horizontal electric field method (IPS mode, FFS mode) can be applied without limitation of the mode, and in the detailed description below, the IPS Mode or FFS mode is applied as an example.

Hereinafter, in describing a touch display device and a driving method thereof according to an embodiment of the present invention, a plurality of touch electrodes are arranged on the touch display panel, and touch driving is performed in a self-capacitance method on the basis of Explain.

However, the present invention is not limited thereto, and even when a plurality of touch driving electrodes and a plurality of touch sensing electrodes are arranged on the touch display panel 110 and touch driving is performed in a mutual capacitance method, an embodiment of the present invention A touch display device and a driving method thereof according to the present invention may be applied.

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

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

The touch display apparatus 100 according to an embodiment of the present invention includes a touch display panel 110 , a display driver 120 , a touch driver 130 , and a backlight unit. 3 , the backlight unit is not shown.

The touch display panel 110 includes a TFT array substrate, a color filter array substrate, and a liquid crystal layer interposed between the two substrates.

A plurality of pixels are arranged in a matrix on the TFT array substrate, and a TFT, a pixel electrode, a common electrode, and a storage capacitor Cst are disposed. On the color filter array substrate, RGB color filters are disposed to correspond to each pixel, and a black matrix is disposed to define an opening area of each pixel and to prevent color mixing.

A plurality of pixels is defined by a plurality of data lines and a plurality of gate lines crossing each other. A TFT and a storage capacitor Cst are disposed in each region where the data line and the gate line cross each other.

A pixel electrode is disposed in each pixel of the TFT array substrate, and a common electrode is disposed so as to correspond to each pixel. The pixel electrode and the common electrode are formed of a transparent conductive material such as indium tin oxide (ITO).

In the present invention, the common electrode is used as the touch electrode 112 as well as for the display. To this end, a plurality of touch electrodes 112 are formed by patterning the common electrode in units of a plurality of pixels. For example, 20 touch electrodes 112 are arranged in a horizontal direction and 32 touch electrodes 112 are arranged in a vertical direction, so that a total of 640 touch electrodes 112 may be arranged on the touch display panel 110 . . However, the present invention is not limited thereto, and the number of touch electrodes 110 disposed on the touch display panel 110 may vary depending on the size of the screen and the setting of the touch sensitivity. Each touch electrode 112 is connected to a channel of the touch driver 130 through a conductive line.

The touch display apparatus 100 according to an embodiment of the present invention displays an image and performs touch sensing by separating the display period and the touch period. For example, by dividing one frame period into a display period and a touch period, display driving and touch driving are performed in a time division manner.

In the display period, a data voltage is supplied to the pixel electrodes and a common voltage Vcom is supplied to the plurality of touch electrodes 112 to display an image. In the touch period, after supplying a touch driving signal to each touch electrode 112 , the capacitance charged in each touch electrode 112 is sensed to sense the presence or absence of the touch and the touch position.

Here, as shown in FIG. 2 , the display is driven at 60 Hz and the touch sensing is driven at 120 Hz within one frame period. That is, the first touch driving period touch1 and the second touch driving period touch2 are included in one frame period.

The display driver 120 includes a gate driver, a data driver, and a timing controller. All or part of the gate driver, data driver, and timing controller may be disposed on the touch display panel 110 in a chip on glass (COG) or a chip on flexible printed circuit (COF) method.

When the touch display panel 110 is manufactured in a small size and applied to a mobile device, the timing controller, the gate driver, and the data driver may be implemented as a single chip.

On the other hand, when the touch display panel 110 is manufactured to have a medium size or larger and is applied to a monitor or TV, the gate driver is formed on the substrate of the liquid crystal panel 100 by an Amorphous Silicon Gate (ASG) method or a Gate In Panel (GIP) method. can be integrated.

The timing controller converts the input RGB image signal into digital RGB image data in units of frames using the timing signal TS input from the outside, and supplies the RBG image data to the data driver. In this case, the timing signal TS includes a vertical synchronization signal V-sync, a horizontal synchronization signal H-sync, and a clock signal CLK.

In addition, the timing controller generates a gate control signal (GCS) for controlling the gate driver using the timing signal TS and supplies it to the gate driver. The gate control signal GCS may include a gate start pulse (GSP), a gate shift clock (GSC), and a gate output enable (GOE).

In addition, the timing controller generates a data control signal (DCS) for controlling the data driver using the timing signal TS and supplies it to the data driver. The data control signal (DCS) is a source start pulse (SSP: Source Start Pulse), a source sampling clock (SSC: Source Sampling Clock), a source output enable (SOE: Source Output Enable), and a polarity control signal (POL: Polarity), etc. may include.

Also, the timing controller supplies a synchronization signal between the display period and the touch period to the touch driver 130 so that the touch driver 130 may be driven in the touch period.

The gate driver generates a gate driving signal for driving the TFTs formed in each of the plurality of pixels based on the gate control signal GCS from the timing controller. Such a gate driver may be configured as a separate chip, or may be embedded in the TFT array substrate of the touch display panel in a gate in panel (GIP) method.

The gate driver sequentially supplies a gate driving signal to a plurality of gate lines formed in the liquid crystal panel in a display period in one frame period. The TFT formed in each pixel is turned on by the gate driving signal.

The data driver converts digital RGB image data supplied from the timing controller into an analog image signal, that is, an RGB data voltage. Then, based on the data control signal DCS from the timing controller, the data voltage is supplied to the plurality of data lines when the TFTs of each pixel are turned on according to the gate driving signal.

A data voltage is supplied to the plurality of pixels and a common voltage Vcom is supplied to the plurality of touch electrodes 112 to display an image. A common voltage Vcom may be generated by the data driver and supplied to the plurality of touch electrodes 112 . As another example, a common voltage Vcom may be generated by the touch driver 130 and supplied to the plurality of touch electrodes 112 .

4 is a diagram illustrating that a plurality of multiplexers are disposed in a touch driver, and a touch sensing area is divided for each of the plurality of multiplexers.

Referring to FIG. 4 , the touch driver 130 includes a signal generator generating a touch driving signal supplied to a plurality of touch electrodes and a sensing unit performing a touch algorithm based on a touch signal received from the touch electrodes.

The signal generator of the touch driver 130 generates a touch driving signal based on a synchronization signal supplied from the timing controller, and supplies the touch driving signal to the plurality of touch electrodes 112 during the touch period. In this case, the touch driving signal applied to the touch electrode 112 may be generated in various forms, such as a square wave pulse, a sine wave, or a triangular wave. Thereafter, the sensing unit of the touch driver 130 senses the capacitance charged in the plurality of touch electrodes 112 . The presence or absence of a touch and a touch position are sensed based on a change in the amount of charge charged in each touch electrode 112 .

In addition, in order to reduce the number of input/output channels of the touch driver 130 , a plurality of multiplexers 132 having an input/output ratio of N:1 are disposed. A plurality of multiplexers 132 are disposed between the output terminal of the signal generator and the plurality of channels, so that the total number of channels of the touch driver 130 can be reduced to 1/N.

In FIG. 4 , seven multiplexers 132 are applied, so that the input/output channels of the touch driver 130 are reduced to 1/7, and the entire touch electrode disposed on the touch display panel 110 is divided into seven sensing regions for touch sensing. This is illustrated as an example.

In FIG. 4 , it has been illustrated and described that seven multiplexers 132 are disposed inside the touch driver 130 . However, the present invention is not limited thereto, and the seven multiplexers 132 may be integrated on the TFT array substrate of the touch display panel 110 as a separate configuration. As another example, the seven multiplexers 132 may be disposed on the touch display panel 110 using a chip on glass (COG) or a chip on flexible printed circuit (COF) method.

The touch display apparatus 100 according to an embodiment of the present invention varies the touch driving time for each multiplexer according to the presence or absence of a touch in order to improve touch performance.

Among a plurality of sequentially driven multiplexers, the driving time of a multiplexer corresponding to a sensing region in which a touch is detected is increased, and the driving time of the remaining multiplexers is decreased. The accumulated value of the touch sensing signal may be increased by increasing the number of times of touch sensing in the sensing region where the touch is detected as the driving time of the multiplexer is increased.

Here, the touch driving time can be varied for each multiplexer according to the presence or absence of a touch in two major ways.

In the first method, in one touch driving period, a plurality of multiplexers are sequentially driven to supply a touch driving signal to all touch electrodes a minimum number of times for touch detection. Thereafter, the touch position is sensed, and the driving time of the multiplexer corresponding to the sensing region where the touch is detected within the same touch driving period may be increased, and the driving time of the remaining multiplexers may be decreased.

Here, the sensing region in which the touch is detected may be one or two or more. That is, there may be one or two or more multiplexers whose driving time is increased.

In the second method, in the first touch driving period, a plurality of multiplexers are sequentially driven for the same time to supply a touch driving signal to all the touch electrodes. Thereafter, the touch position is sensed.

In the second touch period, the driving time of the multiplexer corresponding to the sensing region in which the touch is detected may be increased, and the driving time of the remaining multiplexers may be decreased. The driving time of the remaining multiplexers is reduced so that a touch driving signal is supplied to the touch electrodes of the sensing region other than the sensing region where the touch is detected the minimum number of times for detecting the touch.

Here, the sensing region in which the touch is detected may be one or two or more. That is, there may be one or two or more multiplexers whose driving time is increased.

Hereinafter, a method of driving a touch display device according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 19 .

In the present invention, display driving and touch driving are performed in a time division manner by dividing one frame period into a display period and a touch period. In this case, the display driving is performed at 60 Hz, and the touch driving is performed at 120 Hz.

5 to 7 are diagrams illustrating a method of driving a touch display device according to a first embodiment of the present invention.

5 shows a first touch driving period touch1 among the first touch driving period touch1 and the second touch driving period touch2 included in one frame period, and the first touch driving period touch1 is The touch driving signals output from the 1st to 7th multiplexers are shown.

5 and 6 , the first to seventh multiplexers are sequentially driven for the same time within the first touch driving period touch1 to supply a touch driving signal to all touch electrodes arranged on the touch display panel. . In this case, the touch driving signal is supplied to all the touch electrodes with the minimum accumulated number of times for detecting the touch.

Thereafter, the presence or absence of a touch and a position are detected by sensing the amount of charge of all touch electrodes.

Thereafter, the driving time of each of the first multiplexers to the seventh multiplexers is varied according to the touch result within the first touch driving period touch1 , and the first multiplexers to the seventh multiplexers are driven according to the changed driving time to detect a touch. A touch driving signal is supplied only to a plurality of touch electrodes disposed in the sensing region.

Here, when a touch is detected in the third sensing region receiving the touch driving signal from the third multiplexer MUX3 , the driving time of the third multiplexer MUX3 is increased within the first touch driving period touch1 .

Thereafter, a touch driving signal is supplied to a plurality of touch electrodes disposed in a third sensing region corresponding to the third multiplexer MUX3 .

Thereafter, the amount of charges sensed by the plurality of touch electrodes disposed in the third sensing region is accumulated to detect the presence and/or location of the touch.

At the initial operation time of the first touch driving period (touch1), the first to seventh multiplexers are sequentially driven for the same time to supply the touch driving signal to all the touch electrodes arranged on the touch display panel to detect a touch. The first to seventh multiplexers are driven for a time corresponding to the minimum number of accumulated touch driving signals.

In order to increase the driving time of the multiplexer corresponding to the sensing region in which the touch is detected, the number of accumulated touch driving signals is reduced at the initial operation time to output the touch driving signal within the first touch driving period touch1. secure time for

As described above, by increasing the driving time of the third multiplexer MUX3 by the secured extra time, it is possible to increase the accumulated value of the touch signal in the sensing region where the touch is detected. That is, it is possible to substantially increase the touch sensing time by intensively driving the multiplexer corresponding to the sensing region in which the touch is detected.

For example, when a touch is detected at the second touch electrode among the plurality of touch electrodes receiving the touch driving signal from the third multiplexer MUX3, the driving time of the third multiplexer MUX3 is increased to increase the driving time of the second touch electrode. It is possible to increase the accumulated value of the sensed charge amount, that is, the accumulated value of the touch signal.

Referring to FIG. 7 , a touch may be detected with respect to a plurality of touch electrodes. Among the plurality of touch electrodes receiving a touch driving signal from the third multiplexer MUX3, a touch is detected by the second touch electrode and the third touch electrode. When detected, the accumulated value of the amount of charges sensed by the second touch electrode, that is, the accumulated value of the touch signal, may be increased by increasing the driving time of the third multiplexer MUX3 .

As a specific example, when driving the first touch driving period touch1 by dividing it in half, a touch driving signal is supplied to all touch electrodes during the first half to sense the presence and location of a touch, and sensing in which a touch is detected during the second half It is possible to increase the driving time of the multiplexer corresponding to the region. In this case, the touch sensing performance can be improved by doubling the accumulated value of the touch signal received from the touch electrode that has been touched compared to the prior art.

During the second half of the first touch driving period touch1, multiplexers corresponding to the sensing region in which a touch is not detected do not operate. However, since the touch driving process described with reference to FIGS. 5 to 7 is performed in the same manner in the second touch driving period touch2 , a problem that detection of a touch is omitted does not occur.

8 to 10 are diagrams illustrating a method of driving a touch display device according to a second embodiment of the present invention.

8 illustrates a first touch driving period touch1 among the first touch driving period touch1 and the second touch driving period touch2 included in one frame period, and the first touch driving period touch1 is The touch driving signals output from the 1st to 7th multiplexers are shown.

8 and 9 , the first to seventh multiplexers are sequentially driven for the same time within the first touch driving period touch1 to supply a touch driving signal to all touch electrodes arranged on the touch display panel. . In this case, the touch driving signal is supplied to all the touch electrodes with the minimum accumulated number of times for detecting the touch.

Thereafter, the presence or absence of a touch and a position are detected by sensing the amount of charge of all touch electrodes.

Thereafter, the driving time of each of the first multiplexers to the seventh multiplexers is varied according to the touch result within the first touch driving period touch1 , and the first multiplexers to the seventh multiplexers are driven according to the changed driving time to detect a touch. A touch driving signal is supplied only to a plurality of touch electrodes disposed in the sensing region.

Hereinafter, it is assumed that a touch is detected in a third sensing region receiving a touch driving signal from the third multiplexer MUX3 and a touch is detected in a fourth sensing region receiving a touch driving signal from the fourth multiplexer MUX4. to explain

When a touch is detected in the third sensing region and the fourth sensing region, the driving time of the third multiplexer MUX3 and the fourth multiplexer MUX4 is increased within the first touch driving period touch1 .

Thereafter, a touch driving signal is supplied to a plurality of touch electrodes disposed in a third sensing region corresponding to the third multiplexer MUX3 . Next, a touch driving signal is supplied to a plurality of touch electrodes disposed in a fourth sensing region corresponding to the fourth multiplexer MUX4 .

Thereafter, the amount of charges sensed by the plurality of touch electrodes disposed in the third sensing region and the fourth sensing region is accumulated to detect the presence and/or location of the touch.

At an initial operation time of the first touch driving period touch1, the first to seventh multiplexers are driven for a time corresponding to the minimum accumulated number of touch driving signals capable of detecting a touch. In order to increase the driving time of the multiplexer corresponding to the sensing region in which the touch is detected, the number of accumulated touch driving signals is reduced at the initial operation time to output the touch driving signal within the first touch driving period touch1. secure time for

As described above, by increasing the driving time of the third multiplexer MUX3 and the fourth multiplexer MUX4 within the secured extra time, it is possible to increase the accumulated value of the touch signal in the sensing region where the touch is detected. In this case, the increment of the driving time of the third multiplexer MUX3 and the increment of the driving time of the fourth multiplexer MUX4 are set to be the same. That is, it is possible to substantially increase the touch sensing time by intensively driving the multiplexer corresponding to the sensing region in which the touch is detected.

For example, a touch is detected by the second touch electrode among the plurality of touch electrodes receiving the touch driving signal from the third multiplexer MUX3 and the plurality of touch electrodes receiving the touch driving signal from the fourth multiplexer MUX4 Among them, a touch may be detected by the third touch electrode.

In this case, by increasing the driving time of the third multiplexer MUX3 and the fourth multiplexer MUX4, the accumulated value of the amount of charge sensed by the second touch electrode disposed in the third sensing region, that is, the accumulated value of the touch signal. can Also, the accumulated value of the amount of charge sensed by the third touch electrode disposed in the fourth sensing region, that is, the accumulated value of the touch signal may be increased.

Referring to FIG. 10 , touch positions may be randomly distributed, so that a touch may be performed at a boundary point between two multiplexers. In this case, by increasing the driving time of the two multiplexers, the touch sensing performance is improved.

A touch may be detected with respect to a plurality of touch electrodes, and a touch is performed by the third touch electrode receiving the touch driving signal from the third multiplexer MUX3 and the fourth touch electrode receiving the touch driving signal from the fourth multiplexer MUX4 . can be detected.

In this case, the accumulated value of the amount of charges sensed by the third touch electrode, that is, the accumulated value of the touch signal, may be increased by increasing the driving time of the third multiplexer MUX3 . Also, by increasing the driving time of the fourth multiplexer MUX4, the accumulated value of the amount of charge sensed by the fourth touch electrode, that is, the accumulated value of the touch signal may be increased.

As a specific example, when driving the first touch driving period touch1 by dividing it in half, a touch driving signal is supplied to all touch electrodes during the first half to sense the presence and location of a touch, and sensing in which a touch is detected during the second half It is possible to increase the driving time of the plurality of multiplexers corresponding to the region. In this case, the touch sensing performance can be improved by doubling the accumulated value of the touch signal received from the touch electrode that has been touched compared to the prior art.

During the second half of the first touch driving period touch1, multiplexers corresponding to the sensing region in which a touch is not detected do not operate. However, since the touch driving process described with reference to FIGS. 8 to 10 is performed in the same manner in the second touch driving period touch2 , there is no problem in that detection of a touch is omitted.

11 to 13 are diagrams illustrating a method of driving a touch display device according to a third embodiment of the present invention.

11 illustrates the first touch driving period touch1 among the first touch driving period touch1 and the second touch driving period touch2 included in one frame period, and the first touch driving period touch1 is performed in the first touch driving period touch1. The touch driving signals output from the 1st to 7th multiplexers are shown.

11 and 12 , the first to seventh multiplexers are sequentially driven for the same time within the first touch driving period touch1 to supply a touch driving signal to all the touch electrodes arranged on the touch display panel. . In this case, the touch driving signal is supplied to all the touch electrodes with the minimum accumulated number of times for detecting the touch.

Thereafter, the presence or absence of a touch and a position are detected by sensing the amount of charge of all touch electrodes.

Thereafter, the driving time of each of the first multiplexers to the seventh multiplexers is varied according to the touch result within the first touch driving period touch1 , and the first multiplexers to the seventh multiplexers are driven according to the changed driving time to detect a touch. A touch driving signal is supplied only to a plurality of touch electrodes disposed in the sensing region.

Hereinafter, a touch is detected in a third sensing region receiving a touch driving signal from the second multiplexer MUX2, a touch is detected in a third sensing region receiving a touch driving signal from the third multiplexer MUX3, and a fourth A description will be made on the assumption that a touch is detected in the fourth sensing region receiving the touch driving signal from the multiplexer MUX4.

When a touch is detected in the second sensing region, the third sensing region, and the fourth sensing region, the second multiplexer MUX2, the third multiplexer MUX3, and the fourth multiplexer MUX4 within the first touch driving period touch1 ) to increase the driving time.

Thereafter, the touch driving signal is supplied to the plurality of touch electrodes disposed in the second sensing area corresponding to the second multiplexer MUX2 . Next, a touch driving signal is supplied to the plurality of touch electrodes disposed in the third sensing area corresponding to the third multiplexer MUX3 . Next, a touch driving signal is supplied to a plurality of touch electrodes disposed in a fourth sensing region corresponding to the fourth multiplexer MUX4 .

Thereafter, the amount of charges sensed by the plurality of touch electrodes disposed in the second sensing region, the third sensing region, and the fourth sensing region is accumulated to detect the presence and location of a touch.

At an initial operation time of the first touch driving period touch1, the first to seventh multiplexers are driven for a time corresponding to the minimum accumulated number of touch driving signals capable of detecting a touch. In order to increase the driving time of the multiplexer corresponding to the sensing region in which the touch is detected, the number of accumulated touch driving signals is reduced at the initial operation time to output the touch driving signal within the first touch driving period touch1. secure time for

As described above, by increasing the driving time of the second multiplexer MUX2 , the third multiplexer MUX3 , and the fourth multiplexer MUX4 within the secured extra time, the accumulated value of the touch signal in the sensing region where the touch is detected can increase In this case, the increment of the driving time of the second multiplexer MUX2, the increment of the driving time of the third multiplexer MUX3, and the increment of the driving time of the fourth multiplexer MUX4 are set to be the same. That is, it is possible to substantially increase the touch sensing time by intensively driving the multiplexer corresponding to the sensing region in which the touch is detected.

For example, a touch is detected from a first touch electrode among a plurality of touch electrodes receiving a touch driving signal from the second multiplexer MUX2 and a plurality of touch electrodes receiving a touch driving signal from the third multiplexer MUX3 Among the plurality of touch electrodes receiving a touch driving signal from the fourth multiplexer MUX4, a touch may be detected from the second touch electrode, and a touch may be detected from the fourth touch electrode.

In this case, by increasing the driving time of the second multiplexer MUX2, the third multiplexer MUX3, and the fourth multiplexer MUX4,

The accumulated value of the amount of charge sensed by the first touch electrode disposed in the second sensing region, that is, the accumulated value of the touch signal may be increased. Also, the accumulated value of the amount of charge sensed by the second touch electrode disposed in the third sensing region, that is, the accumulated value of the touch signal may be increased. Also, the accumulated value of the amount of charge sensed by the third touch electrode disposed in the fourth sensing region, that is, the accumulated value of the touch signal may be increased.

Referring to FIG. 13 , touch positions may be randomly distributed, so that a touch may be performed in a sensing region corresponding to three multiplexers. In this case, the driving time of the three multiplexers is increased to improve the touch sensing performance.

A touch may be detected with respect to a plurality of touch electrodes. A first touch electrode receiving a touch driving signal from the second multiplexer MUX2, a second touch electrode receiving a touch driving signal from the third multiplexer MUX3, and A touch may be detected by the third touch electrode and the fourth touch electrode receiving the touch driving signal from the fourth multiplexer MUX4.

In this case, by increasing the driving time of the second multiplexer MUX2, the accumulated value of the amount of charges sensed by the first touch electrode, that is, the accumulated value of the touch signal may be increased. In addition, by increasing the driving time of the third multiplexer MUX3, the accumulated value of the amount of charges sensed by the second touch electrode and the third touch electrode, that is, the accumulated value of the touch signal may be increased. Also, by increasing the driving time of the fourth multiplexer MUX4, the accumulated value of the amount of charge sensed by the fourth touch electrode, that is, the accumulated value of the touch signal may be increased.

As a specific example, when driving the first touch driving period touch1 by dividing it in half, a touch driving signal is supplied to all touch electrodes during the first half to sense the presence and location of a touch, and sensing in which a touch is detected during the second half It is possible to increase the driving time of the plurality of multiplexers corresponding to the region. In this case, the touch sensing performance can be improved by doubling the accumulated value of the touch signal received from the touch electrode that has been touched compared to the prior art.

During the second half of the first touch driving period touch1, multiplexers corresponding to the sensing region in which a touch is not detected do not operate. However, since the touch driving process described with reference to FIGS. 11 to 13 is performed in the same manner in the second touch driving period touch2 , a problem that detection of a touch is omitted does not occur.

14 to 16 are diagrams illustrating a method of driving a touch display device according to a fourth embodiment of the present invention.

14 illustrates the first touch driving period touch1 and the second touch driving period touch2 included in one frame period, and the second touch driving period touch1 and the second touch driving period touch2 are shown in FIG. The touch driving signals output from the 1st to 7th multiplexers are shown.

14 and 15 , the first to seventh multiplexers are sequentially driven for the same time in the first touch driving period of one frame period, and the touch driving signal is supplied to all touch electrodes arranged on the touch display panel. . In the first touch driving period, the driving times of the first to seventh multiplexers are not adjusted.

Thereafter, the presence or absence of a touch and a position are detected by sensing the amount of charge of all touch electrodes.

According to the detection result of the presence and location of the touch in the first touch driving interval, the driving time for each of the plurality of multiplexers is varied in the second touch driving period of one frame period, and the first to second multiplexers according to the changed driving time 7 The multiplexer is driven to supply a touch driving signal to all touch electrodes.

Here, when a touch is detected in the third sensing region receiving the touch driving signal from the third multiplexer MUX3 , the driving time of the third multiplexer MUX3 is increased within the second touch driving period touch2 . At the same time, the driving time of the first, second, fourth to seventh multiplexers MUX1 , MUX2 , MUX4 , MUX5 , MUX6 , and MUX7 except for the third multiplexer MUX3 is reduced.

In this way, in order to increase the driving time of the third multiplexer MUX3 corresponding to the third sensing region in which the touch is detected, the first, second, fourth to seventh multiplexers MUX1, MUX2, MUX4, MUX5, MUX6 , MUX7 is reduced to secure an extra time for outputting the touch driving signal within the second touch driving period touch2 .

Here, the first, second, and fourth to seventh multiplexers MUX1, MUX2, MUX4, MUX5, MUX6, and MUX7 are driven for a time corresponding to the minimum accumulated number of touch driving signals capable of detecting a touch.

Thereafter, the first, second, and fourth to seventh multiplexers MUX1, MUX2, MUX4, MUX5, MUX6, and MUX7 are driven with a reduced driving time and disposed in the first, second, and fourth to seventh sensing regions. A touch driving signal is supplied to the plurality of touch electrodes. Then, the third multiplexer MUX3 is driven with an increased driving time to supply a touch driving signal to the plurality of touch electrodes disposed in the third sensing region.

As described above, by increasing the driving time of the third multiplexer MUX3 by the secured extra time, it is possible to increase the accumulated value of the touch signal in the sensing region where the touch is detected. That is, it is possible to substantially increase the touch sensing time by intensively driving the multiplexer corresponding to the sensing region in which the touch is detected.

Thereafter, the amount of charges sensed by all the touch electrodes disposed in the entire sensing area is accumulated to detect the presence and/or location of the touch.

For example, when a touch is detected at the second touch electrode among the plurality of touch electrodes receiving the touch driving signal from the third multiplexer MUX3, the driving time of the third multiplexer MUX3 is increased to increase the driving time of the second touch electrode. It is possible to increase the accumulated value of the sensed charge amount, that is, the accumulated value of the touch signal.

Referring to FIG. 16 , a touch may be detected with respect to a plurality of touch electrodes. A touch is detected on the second touch electrode from among the plurality of touch electrodes receiving the touch driving signal from the second multiplexer MUX2 , and a second touch is detected from among the plurality of touch electrodes receiving the touch driving signal from the third multiplexer MUX3 . It is assumed that a touch is detected by the touch electrode and the third touch electrode.

In this case, by reducing the driving time of the first multiplexer MUX1 and the fourth to seventh multiplexers MUX4, MUX5, MUX6, and MUX7, the operation time of the second multiplexer MUX2 and the third multiplexer MUX3 is reduced within the secured time. Increase running time. Through this, the accumulated value of the amount of charges sensed by the second touch electrode and the third touch electrode, that is, the accumulated value of the touch signal may be increased.

In this case, the touch sensing performance can be improved by doubling the accumulated value of the touch signal received from the touch electrode that has been touched compared to the prior art. Since all touch electrodes are sensed in the first touch driving period touch1 and the second touch driving period touch2, there is no problem in that detection of a touch is omitted.

17 to 19 are diagrams illustrating a method of driving a touch display device according to a fifth embodiment of the present invention.

17 illustrates the first touch driving period touch1 and the second touch driving period touch2 included in one frame period, and the second touch driving period touch1 and the second touch driving period touch2 are shown in FIG. The touch driving signals output from the 1st to 7th multiplexers are shown.

17 and 18, the first to seventh multiplexers are sequentially driven for the same time in the first touch driving period of one frame period, and the touch driving signal is supplied to all touch electrodes arranged on the touch display panel. . In the first touch driving period, the driving times of the first to seventh multiplexers are not adjusted.

Thereafter, the presence or absence of a touch and a position are detected by sensing the amount of charge of all touch electrodes.

According to the detection result of the presence and location of the touch in the first touch driving interval, the driving time for each of the plurality of multiplexers is varied in the second touch driving period of one frame period, and the first to second multiplexers according to the changed driving time 7 The multiplexer is driven to supply a touch driving signal to all touch electrodes.

Hereinafter, it is assumed that a touch is detected in a third sensing region receiving a touch driving signal from the third multiplexer MUX3 and a touch is detected in a fourth sensing region receiving a touch driving signal from the fourth multiplexer MUX4. to explain

When a touch is detected in the third sensing region receiving the touch driving signal from the third multiplexer MUX3 and the touch is detected in the fourth sensing region receiving the touch driving signal from the fourth multiplexer MUX4, the first touch driving period The driving time of the third multiplexer MUX3 and the fourth multiplexer MUX4 in touch1 is increased. At the same time, the driving time of the first, second, fifth to seventh multiplexers MUX1 , MUX2 , MUX5 , MUX6 , and MUX7 excluding the third multiplexer MUX3 and the fourth multiplexer MUX4 is reduced.

In this way, in order to increase the driving time of the third multiplexer MUX3 corresponding to the third sensing region in which the touch is detected and the fourth multiplexer MUX4 corresponding to the fourth sensing region in which the touch is detected, the first, first The driving time of the second and fifth to seventh multiplexers MUX1, MUX2, MUX5, MUX6, and MUX7 is reduced to secure an extra time for outputting the touch driving signal within the second touch driving period touch2.

Here, the first, second, fifth to seventh multiplexers MUX1 , MUX2 , MUX5 , MUX6 , and MUX7 are driven for a time corresponding to the minimum accumulated number of touch driving signals capable of detecting a touch.

The plurality of first, second, fifth to seventh multiplexers MUX1, MUX2, MUX4, MUX5, MUX6, and MUX7 are driven with a reduced driving time to be disposed in the first, second, fifth to seventh sensing regions A touch driving signal is supplied to the touch electrode of the Then, the third multiplexer MUX3 and the fourth multiplexer MUX4 are driven with an increased driving time to supply a touch driving signal to the plurality of touch electrodes disposed in the third sensing region and the fourth sensing region.

As described above, by increasing the driving time of the third multiplexer MUX3 and the fourth multiplexer MUX4 by the secured extra time, it is possible to increase the accumulated value of the touch signal in the sensing region where the touch is detected. That is, it is possible to substantially increase the touch sensing time by intensively driving a plurality of multiplexers corresponding to the sensing region where the touch is detected.

Thereafter, the amount of charges sensed by all the touch electrodes disposed in the entire sensing area is accumulated to detect the presence and/or location of the touch.

For example, a touch is detected by the second touch electrode among the plurality of touch electrodes receiving the touch driving signal from the third multiplexer MUX3 and the plurality of touch electrodes receiving the touch driving signal from the fourth multiplexer MUX4 Among them, a touch may be detected by the fourth touch electrode.

In this case, the accumulated value of the amount of charges sensed by the second touch electrode, that is, the accumulated value of the touch signal, may be increased by increasing the driving time of the third multiplexer MUX3 . In addition, by increasing the driving time of the fourth multiplexer MUX4, the accumulated value of the amount of charge sensed by the fourth touch electrode, that is, the accumulated value of the touch signal may be increased.

Referring to FIG. 19 , a touch may be detected with respect to a plurality of touch electrodes. A touch is detected on the third touch electrode among the plurality of touch electrodes receiving the touch driving signal from the third multiplexer MUX3, and a fourth among the plurality of touch electrodes receiving the touch driving signal from the fourth multiplexer MUX4 It is assumed that a touch is detected by the touch electrode.

In this case, the driving time of the first multiplexer MUX1 , the second multiplexer MUX2 , and the fifth to seventh multiplexers MUX5 , MUX6 , and MUX7 is reduced to reduce the third multiplexer MUX3 and the fourth multiplexer within the secured time. Increase the driving time of the multiplexer MUX4. Through this, the accumulated value of the amount of charges sensed by the third touch electrode and the fourth touch electrode, that is, the accumulated value of the touch signal may be increased.

In this case, the touch sensing performance can be improved by doubling the accumulated value of the touch signal received from the touch electrode that has been touched compared to the prior art. Since all touch electrodes are sensed in the first touch driving period touch1 and the second touch driving period touch2, there is no problem in that detection of a touch is omitted.

The touch display device and the driving method thereof according to an embodiment of the present invention can improve touch sensing performance by varying the touch driving time for each multiplexer according to the presence or absence of a touch. In addition, the touch sensing performance may be improved by increasing the touch driving time of the multiplexer corresponding to the touched area.

Those skilled in the art to which the present invention pertains will be able to understand that the above-described 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: touch display device
110: touch display panel
120: display driver
130: touch driver
132: multiplexer

Claims (9)

supplying a touch driving signal to all touch electrodes arranged in a touch display panel by sequentially driving a plurality of multiplexers for the same time in a first touch driving period of one frame period;
detecting the presence and absence of a touch by sensing the amount of charge of the entire touch electrode;
A method of driving a touch display device including a; varying the driving time for each of the plurality of multiplexers according to the presence or absence of a touch. According to claim 1,
In the first touch driving period, a driving time of one or a plurality of multiplexers corresponding to a sensing region in which a touch is detected among the plurality of multiplexers is increased;
A method of driving a touch display device for supplying a touch driving signal to a plurality of touch electrodes disposed in a sensing region where a touch is detected. 3. The method of claim 2,
In the first touch driving period, a method of driving a touch display device for detecting presence and location of a touch by accumulating charges of a plurality of touch electrodes disposed in a sensing region corresponding to a multiplexer having an increased driving time. supplying a touch driving signal to all touch electrodes arranged in a touch display panel by sequentially driving a plurality of multiplexers for the same time in a first touch driving period of one frame period;
detecting the presence and absence of a touch by sensing the amount of charge of the entire touch electrode; and
and supplying a touch driving signal to all the touch electrodes by varying the driving time for each of the plurality of multiplexers in a second touch driving period according to the detection result of the presence or absence of the touch and the position of the touch. 5. The method of claim 4,
In the second touch driving period, a driving time of one or a plurality of multiplexers corresponding to a sensing region in which a touch is detected among the plurality of multiplexers is increased;
A method of driving a touch display device for reducing a driving time of one or a plurality of multiplexers corresponding to the remaining sensing regions in which a touch is not detected. 6. The method of claim 5,
In the second touch driving period, a method of driving a touch display device for detecting presence and location of a touch by accumulating charges of a plurality of touch electrodes disposed in a sensing region corresponding to a multiplexer having an increased driving time. a touch display panel including a plurality of pixels defined by a plurality of gate lines and a plurality of data lines, a thin film transistor (TFT) and a pixel electrode disposed in the plurality of pixels, and a plurality of touch electrodes;
a touch driver outputting a touch driving signal and sensing the amount of charge of the plurality of touch electrodes; and
a plurality of multiplexers dividing the plurality of touch electrodes to supply a touch driving signal;
The driving time of each of the plurality of multiplexers is varied according to the touch sensing result of the first touch driving period of one frame period, and each of the plurality of multiplexers is driven during the variable driving time to supply a touch driving signal to all touch electrodes, Alternatively, a touch display device that supplies a driving signal to a plurality of touch electrodes disposed in a sensing region where a touch is detected. 8. The method of claim 7,
In the first touch driving period, a driving time of one or a plurality of multiplexers corresponding to a sensing region in which a touch is detected among the plurality of multiplexers is increased. 8. The method of claim 7,
In a second touch driving period after the first touch driving period,
increasing a driving time of one or a plurality of multiplexers corresponding to a sensing region in which a touch is detected among the plurality of multiplexers;
A touch display device for reducing a driving time of one or a plurality of multiplexers corresponding to the remaining sensing regions in which no touch is detected.

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