KR102388990B1 - Touch Display Device And Method Of Driving The Same, And Touch Driving Circuit - Google Patents

Abstract

The present invention relates to an in-cell touch type touch display device capable of improving a touch sensitivity deviation by differently setting a touch threshold value according to a location of a touch sensor, a driving method thereof, and a touch driving circuit is about
A touch display apparatus according to an embodiment of the present invention includes a touch panel on which a plurality of touch sensors are disposed, a plurality of touch lines connected to each of the plurality of touch sensors, and a driving circuit unit. The driving circuit unit includes a source/touch driving unit, a touch sensing unit, and a micro controller unit (MCU). The source/touch driver is connected to the plurality of touch lines and supplies a touch driving signal to the plurality of touch sensors. In addition, the touch sensing unit detects a change in capacitance received from the plurality of touch sensors, and generates a plurality of touch reference values serving as a reference for touch detection. In addition, the microcontroller unit (MCU) senses the presence and absence of a touch based on the capacitance change values of the plurality of touch sensors. Here, the microcontroller unit (MCU) selectively applies a plurality of touch reference values when determining a touch according to a location where the plurality of touch sensors are disposed on the touch panel.

Description

Touch Display Device And Method Of Driving The Same, And Touch Driving Circuit

The present invention relates to an in-cell touch type touch display device, and in particular, a touch display capable of improving a touch sensitivity deviation by differently setting a touch threshold value according to a location of a touch sensor. It relates to an apparatus, a driving method thereof, and a touch driving circuit.

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.

A touch panel can be classified into a resistive type, a capacitive type, and infrared sensing prevention according to a touch sensing type. 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 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.

Referring to FIG. 1 , a touch display device 1 according to the related art includes a touch panel 10 and a driving circuit unit. In FIG. 1 , the source/touch driver 30 and the gate driver 40 are shown among the driving circuit parts, but the timing controller and the touch sensing part are not shown.

The source/touch driving unit 30 includes a plurality of source/touch driving ICs, and the plurality of source/touch driving ICs are divided by 1/2 and disposed at the upper and lower sides of the touch panel 10 . A plurality of touch sensors 20 are disposed on the touch panel 10 , and each touch sensor 20 is connected to a source/touch driving IC through a touch line 22 .

The gate driver 40 includes a plurality of gate driver ICs, and the plurality of gate driver ICs are disposed on both sides of the touch panel 10 .

One touch sensor 20 may be disposed to correspond to a plurality of pixels. For example, each touch sensor 20 may be disposed in an area corresponding to 40 pixels in a horizontal direction and 12 pixels in a vertical direction. In this case, each touch sensor 20 is configured using a common electrode disposed for image display. That is, the plurality of touch sensors 20 are configured by patterning the common electrode.

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 electrode and a common voltage Vcom is supplied to the plurality of touch sensors 20 to display an image. In the touch period, the source/touch driving unit 30 supplies a touch driving signal to each touch sensor 20 , then receives the charged capacitance of each touch sensor 20 , and the touch sensing unit receives each touch sensor By detecting a change in the capacitance of ( 20 ), the presence or absence of a touch and a touch position are sensed.

FIG. 2 is a diagram illustrating that a load increases in proportion to the distance between the source/touch driver and the touch sensor, and the touch sensitivity decreases in proportion to the distance between the source/touch driver and the touch sensor.

Referring to FIG. 2 , in the case of a large-screen (eg, 86-inch or larger) touch display device that displays an image with a high resolution of 4K UHD (Ultra High Definition) or higher, the number and touch of the touch sensors 20 are proportional to the screen size. The number of lines 22 is increased.

Here, the length of the touch line 22 connecting each touch sensor and the source/touch driver 30 is different according to the position where the touch sensor 20 is disposed on the touch panel 10 .

Among the plurality of touch sensors 20 , the touch sensors disposed close to the source/touch driver 30 , for example, touch sensors disposed at the top and bottom of the touch panel 10 , may small. On the other hand, touch sensors disposed far from the source/touch driver 30 , for example, touch sensors disposed in the center area C/A of the touch panel 10 , have a large load on the touch line 22 .

Accordingly, even when the same touch driving signal is supplied to all touch sensors 20 , the amount of charge charged in each touch sensor 20 is different due to a load deviation of the touch line 22 according to the position of the touch sensor 20 . do.

Since the same touch reference value is applied to all touch sensors 20 when determining whether a touch is present, touch sensitivity may decrease depending on the location of the touch sensor 20 . In particular, the amount of charge charged in the touch sensor 20 disposed in the center area C/A of the touch panel 10 is reduced, so that the touch sensor 20 disposed in the center area C/A actually touches the touch sensor 20 . Even if , the change in capacitance is less than the touch reference value used to determine whether there is a touch, and thus the touch may not be sensed.

That is, as the distance from the source/touch driver 30 increases, the touch sensitivity of the plurality of touch sensors 20 decreases, and the distance from the source/touch driver 30 increases in the center region C/A that is the farthest. The touch sensor 20 has a problem in that the touch sensitivity is rapidly decreased.

The present invention is to solve the above-described problem, and in an in-cell touch type touch display device, a touch display device capable of uniformly maintaining the touch sensitivity of the entire touch sensor regardless of the position of the touch sensor; It is a technical task to provide a method for driving the same.

The present invention is to solve the above-described problem, and in an in-cell touch type touch display device, it is possible to prevent the touch sensitivity of the touch sensor from decreasing as the distance from the source/touch driver increases. It is a technical task to provide a touch display device and a driving method thereof.

The present invention is to solve the above-described problem, and in an in-cell touch type touch display device, a touch display device capable of preventing a decrease in touch sensitivity of touch sensors disposed in a center region of a touch panel It is a technical task to provide and a method for driving the same.

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 of ordinary skill in the art from such description and description.

In order to achieve the above-described technical problem, a touch display device according to an embodiment of the present invention includes a touch panel on which a plurality of touch sensors are disposed, a plurality of touch lines connected to each of the plurality of touch sensors, and a driving circuit unit. The driving circuit unit includes a source/touch driving unit, a touch sensing unit, and a micro controller unit (MCU). The source/touch driver is connected to the plurality of touch lines and supplies a touch driving signal to the plurality of touch sensors. In addition, the touch sensing unit detects a change in capacitance received from the plurality of touch sensors, and generates a plurality of touch reference values serving as a reference for touch detection. In addition, the microcontroller unit (MCU) senses the presence and absence of a touch based on the capacitance change values of the plurality of touch sensors. Here, the microcontroller unit (MCU) selectively applies a plurality of touch reference values when determining a touch according to a position where the plurality of touch sensors are disposed on the touch panel.

The touch sensing unit of the touch display device according to an embodiment of the present invention includes a touch reference value setting unit and a capacitance detecting unit. The touch reference value setting unit sets a plurality of touch reference values that are differently applied according to the location of the touch sensor. In addition, the microcontroller unit (MCU) selectively applies the plurality of touch reference values according to the positions of the plurality of touch sensors to determine the presence and absence of a touch and the location.

The microcontroller unit (MCU) of the touch display device according to an embodiment of the present invention applies a first touch reference value when determining a touch of a plurality of first touch sensors disposed above and below the touch panel. In addition, the microcontroller unit (MCU) applies a second touch reference value smaller than the first touch reference value when determining touches of the plurality of second touch sensors disposed in the center region of the touch panel.

When the microcontroller unit (MCU) of the touch display device according to an embodiment of the present invention determines touches of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors, the first Apply the touch reference value.

When the microcontroller unit (MCU) of the touch display device according to an embodiment of the present invention determines touches of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors, the first A third touch reference value smaller than the touch reference value and greater than the second touch reference value is applied.

In order to achieve the technical problem described above, in the method of driving a touch display device according to an embodiment of the present invention, a plurality of touch reference values are selectively applied when determining a touch according to positions of a plurality of touch sensors disposed on a touch panel. Here, the first touch reference value is applied to the touch determination of the plurality of first touch sensors disposed on the upper and lower portions of the touch panel. In addition, a second touch reference value smaller than the first touch reference value is applied to the touch determination of the plurality of second touch sensors disposed in the center region of the touch panel.

In the method of driving a touch display device according to an embodiment of the present invention, the first touch reference value is applied to touch determination of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors. .

In the method of driving a touch display device according to an embodiment of the present invention, the touch determination of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors is smaller than the first touch reference value and the A third touch reference value greater than the second touch reference value is applied.

In the method of driving a touch display device according to an embodiment of the present invention, a plurality of touch reference values are selectively applied when determining a touch according to positions of a plurality of touch sensors disposed on a touch panel. Here, as the distance from the top and bottom of the touch panel increases, the touch reference value applied to the touch determination is decreased.

The touch driving circuit of the present invention includes a touch driving unit, a touch sensing unit, and a micro controller unit (MCU). The touch driving unit supplies a touch driving signal to a plurality of touch sensors disposed on the touch panel. In addition, the touch sensing unit senses a change in capacitance of each of the plurality of touch sensors. The microcontroller unit (MCU) senses a touch presence and a touch position based on a change in capacitance of each of the plurality of touch sensors. Here, the microcontroller unit (MCU) selectively applies a plurality of touch reference values when determining a touch according to a position where the plurality of touch sensors are disposed on the touch panel.

In the method of driving a touch display device according to an embodiment of the present invention, the touch reference value applied to the touch determination of the plurality of touch sensors disposed on the upper and lower sides of the touch panel is the largest. In addition, the touch reference value applied to the touch determination of the plurality of touch sensors disposed in the center region of the touch panel is the smallest.

The in-cell touch type touch display device and the driving method thereof according to the present invention can uniformly maintain the touch sensitivity of the entire touch sensor regardless of the position of the touch sensor.

The in-cell touch type touch display device and the driving method thereof of the present invention can prevent the touch sensitivity of the touch sensor from decreasing as the distance from the source/touch driver increases.

The in-cell touch type touch display apparatus and the driving method thereof according to the present invention can prevent the touch sensitivity of the touch sensors disposed in the center area of the touch panel from decreasing.

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 showing a touch display device according to the prior art.
FIG. 2 is a diagram illustrating that a load increases in proportion to the distance between the source/touch driver and the touch sensor, and the touch sensitivity decreases in proportion to the distance between the source/touch driver and the touch sensor.
3 is a diagram illustrating a touch display device according to an embodiment of the present invention.
4 is a diagram illustrating one of a plurality of source/touch driving ICs disposed in a source/touch driving unit according to an embodiment of the present invention.
5 is a diagram illustrating a touch sensing unit according to an embodiment of the present invention.
6 is a diagram illustrating an example of sensing a touch by differently setting a touch threshold value according to a location of a touch sensor.
7 and 8 are diagrams illustrating another example of sensing a touch by differently setting a touch threshold value according to a location of a touch sensor.

Like reference numerals refer to substantially identical elements throughout. In the following description, a detailed description 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 in this specification 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 make the disclosure of the present invention 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.

In the present specification, it should be noted that, in adding reference numbers to the components of each drawing, the same numbers are provided to the same components as possible even though they are indicated on different drawings.

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 gist 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, cases including the plural are included unless otherwise explicitly stated.

In interpreting the components, it is construed 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 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 of 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 elements, these elements 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 may 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 twisted nematic (TN) mode, VA (vertical alignment) mode, IPS (in plane switching) mode, and fringe field switching (FFS) mode 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 with a vertical electric field.

Meanwhile, in the IPS mode and the FFS mode, a pixel electrode and a common electrode are disposed on a lower substrate to control the arrangement of the liquid crystal layer by a horizontal electric field between the pixel electrode and the common electrode.

In the IPS mode, a horizontal electric field is generated between both electrodes by alternately arranging the pixel electrode and the common electrode in parallel to control the arrangement of the liquid crystal layer. 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 sensors are arranged on a touch panel and touch sensing is performed in a self-capacitance method. do.

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 panel and touch sensing is performed using a mutual capacitance method, the touch display according to an embodiment of the present invention The device and its driving method can 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 illustrating a touch display device according to an embodiment of the present invention.

Referring to FIG. 3 , the touch display apparatus 100 according to an embodiment of the present invention includes a touch panel 110 and a driving circuit unit. A plurality of touch sensors 120 are disposed on the touch panel 110 .

The driving circuit unit includes a source/touch driving unit 130 including a plurality of source/touch driving ICs 135 , a gate driving unit 140 including a plurality of gate driving ICs 145 , a timing controller 150 , and touch sensing. It includes a unit 160 , a micro controller unit (MCU) and a power supply unit 170 .

The touch panel 110 is a liquid crystal panel in which the touch sensor 120 is coupled, and light must be supplied to the touch panel 110 to display an image. To this end, the touch display device of the present invention includes a backlight unit. 3 , the backlight unit is not shown.

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

RGB color filters are disposed on the color filter array substrate to correspond to each sub-pixel. A black matrix is disposed to define an opening area of each subpixel and prevent color mixing.

A plurality of sub-pixels are arranged in a matrix on the TFT array substrate, and the plurality of sub-pixels are defined by a plurality of data lines and a plurality of gate lines crossing each other. The R, G, and B subpixels are gathered to form one pixel. In each subpixel, a TFT as a switching element, a pixel electrode, a common electrode, and a storage capacitor Cst are disposed. Here, the pixel electrode is formed for each sub-pixel, and the common electrode is formed in units of a plurality of sub-pixels.

In the present invention, the common electrode is used as the touch sensor 120 as well as for the display. To this end, the plurality of touch sensors 120 are formed by patterning the common electrode in units of a plurality of sub-pixels. The pixel electrode and the common electrode (touch sensor 120) are formed of a transparent conductive material such as indium tin oxide (ITO).

Here, each of the plurality of touch sensors 120 is formed to have an area corresponding to the plurality of pixels. Each of the plurality of touch sensors 120 may be disposed in an area corresponding to 40 pixels in a horizontal direction and 12 pixels in a vertical direction. That is, one touch sensor 120 may be disposed in an area corresponding to 480 pixels. However, the present invention is not limited thereto, and the size of the touch sensor 120 may vary depending on the size of the touch panel 110 and the required touch performance. The plurality of touch sensors 120 are not necessarily all arranged in the same size, and are located at the outer portion (four-sided edge portion) of the touch panel 110 than the first touch sensors arranged in the central portion of the touch panel 110 . The size of the disposed second touch sensors may be small.

4 is a diagram illustrating one of a plurality of source/touch driving ICs disposed in a source/touch driving unit according to an embodiment of the present invention.

Referring to FIG. 4 , the source/touch driving IC 135 includes a data driving unit 135a and a touch driving unit 135b. In FIG. 4 , the source/touch driving IC 135 includes one data driving unit 135a and one touch driving unit 135b, but the present invention is not limited thereto. A driving unit 135b may be included.

The data line DL disposed in each subpixel is connected to the data driver 135a, and supplies an image signal (pixel electrode voltage) to each subpixel through the data line. In addition, the plurality of touch sensors 120 disposed on the touch panel 110 are connected to the source/touch driver 130 through the plurality of touch lines 122 .

The data driver 135a of the source/touch driver 130 converts digital RGB image data supplied from the timing controller 150 into an analog image signal, that is, an RGB data voltage. Then, based on the received data control signal DCS, the data voltage is supplied to the plurality of data lines according to the timing when the TFTs of each sub-pixel are turned on. A data voltage is supplied to the plurality of sub-pixels and a common voltage Vcom is supplied to the plurality of touch sensors 120 to display an image. At this time, the common voltage Vcom is generated from the power supply unit 170 and supplied to the plurality of touch sensors 120 . As another example, the common voltage Vcom may be generated by the touch sensing unit 160 and supplied to the plurality of touch sensors 120 .

The touch driving unit 135b generates a touch driving signal and supplies the touch driving signal to the plurality of touch sensors 120 through a plurality of touch lines 122 connected to each of the plurality of touch sensors 120 .

Here, the touch line 122 is disposed in the same direction as the data line DL. The touch line 122 may be disposed on the same layer as the data line DL. However, the present invention is not limited thereto, and the touch line 122 may be disposed on a different layer from the data line DL.

The touch display apparatus 100 according to an embodiment of the present invention displays an image and performs touch sensing by dividing 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 sensing driving are performed in a time division manner.

In the display period, a data voltage is supplied to the pixel electrode and a common voltage Vcom is supplied to the plurality of touch sensors 120 to display an image. In the touch period, after supplying a touch driving signal to each touch sensor 120 , a change in capacitance charged in each touch sensor 120 is detected to sense the presence or absence of a touch and a touch position.

Again, referring to FIG. 3 , the driving circuit unit includes a source/touch driving unit 130 , a gate driving unit 140 , a timing controller 150 , a touch sensing unit 160 , and a power supply unit 170 . All or part of the configuration of the driving circuit unit may be disposed on the touch panel 110 in a Chip On Glass (COG) or Chip On Flexible Printed Circuit (COF) method.

The timing controller 150 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 source/touch driver 130 . 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.

Also, the timing controller 150 generates a gate control signal (GCS) for controlling the gate driver 140 using the timing signal TS and supplies it to the gate driver 140 . 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 150 generates a data control signal (DCS) for controlling the source/touch driver 130 using the timing signal TS and supplies it to the source/touch driver 130 . . 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 150 supplies a synchronization signal between the display period and the touch period to the touch sensing unit 160 so that the touch sensing unit 160 may be driven in the touch period. That is, the touch sensing unit 160 may distinguish the display period from the touch period based on the synchronization signal supplied from the timing controller 150 , and may perform touch sensing in the touch period.

The gate driver 140 sequentially supplies the gate driving signal to the plurality of gate lines GL disposed on the touch panel 110 during the display period in one frame period. The TFT formed in each sub-pixel is turned on by the gate driving signal.

The data driver 135a of the source/touch driver 130 supplies a data voltage to the plurality of data lines according to a timing when the TFTs of each subpixel are turned on. A data voltage is supplied to the plurality of sub-pixels and a common voltage Vcom is supplied to the plurality of touch sensors 120 to display an image.

5 is a diagram illustrating a touch sensing unit according to an embodiment of the present invention.

Referring to FIG. 5 , the touch sensing unit 160 includes a capacitance detecting unit 162 and a touch reference value setting unit 164 . The touch reference value setting unit 164 sets a plurality of touch reference values that are differently applied according to positions of the plurality of touch sensors 120 in the touch panel 110 . In addition, the capacitance detecting unit 162 senses a change in capacitance of each touch electrode 120 by selectively applying the plurality of touch reference values according to the positions of the plurality of touch sensors 120 .

Here, the change value of the capacitance of each touch sensor 120 is generated by the touch sensing unit 160, and the presence or absence of a touch and the touch position are determined by a micro controller unit (MCU) disposed on the main board. The touch sensing unit 160 converts an analog capacitance value into digital touch data and supplies it to a micro controller unit (MCU). The microcontroller unit (MCU) analyzes the input digital touch data to determine whether each touch sensor 120 has a touch and a touch position.

6 is a diagram illustrating an example of sensing a touch by differently setting a touch threshold value according to a location of a touch sensor.

Referring to FIG. 6 , the touch reference value setting unit 164 of the touch sensing unit 160 includes a first touch applied to a touch determination of a plurality of first touch sensors disposed above and below the touch panel 110 . Set the reference value.

Also, the touch reference value setting unit 164 of the touch sensing unit 160 sets a second touch reference value to be applied to touch determination of a plurality of second touch sensors disposed in the center region of the touch panel 110 . .

The capacitance detection unit 162 of the touch sensing unit 160 receives the capacitance charged in each of the plurality of touch sensors 120 , and detects a change in capacitance of each touch sensor 120 . The microcontroller unit (MCU) senses the presence or absence of a touch and the touch position by selectively applying the first touch reference value and the second touch reference value described above according to the respective positions of the plurality of touch sensors 120 .

The capacitance detection unit 162 of the touch sensing unit 160 detects a change in capacitance of a plurality of first touch sensors disposed above and below the touch panel 110 . Here, when the microcontroller unit (MCU) determines the touch of the plurality of first touch sensors, the first touch reference value is applied.

In addition, the capacitance detection unit 162 of the touch sensing unit 160 detects a change in capacitance of the plurality of second touch sensors disposed in the center region of the touch panel 110 . Here, when the microcontroller unit (MCU) determines the touch of the plurality of second touch sensors, the second touch reference value is applied.

Meanwhile, a microcontroller unit (MCU) is configured to connect the plurality of first touch sensors disposed on the upper and lower portions of the touch panel 110 and the plurality of second touch sensors disposed on the center region of the touch panel 110 . The first touch reference value is applied to the touch determination of the plurality of third touch sensors except for the touch.

7 and 8 are diagrams illustrating another example of sensing a touch by differently setting a touch threshold value according to a location of a touch sensor.

7 and 8 , the touch reference value setting unit 164 of the touch sensing unit 160 includes a plurality of first touches disposed in the upper region 110b and the lower region 110c of the touch panel 110 . A first touch reference value to be applied to the sensor's touch determination is set.

Also, the touch reference value setting unit 164 sets a second touch reference value to be applied to touch determination of a plurality of second touch sensors disposed in the center region 110a of the touch panel 110 .

In addition, the touch reference value setting unit 164 may perform a touch of a plurality of third touch sensors disposed in a region 110d between the upper region 110b and the center region 110a of the touch panel 110 . A third touch reference value to be applied to the determination is set.

In addition, the touch reference value setting unit 164 may perform a touch of a plurality of third touch sensors disposed in a region 110e between the lower region 110c and the center region 110a of the touch panel 110 . A third touch reference value to be applied to the determination is set. Here, the third touch reference value is smaller than the first touch reference value and has a larger value than the second touch reference value.

Subsequently, the microcontroller unit (MCU) applies the first touch reference value when determining the touch of the plurality of first touch sensors disposed on the upper and lower portions 110b and 110c of the touch panel 110 .

Also, the microcontroller unit (MCU) applies the second touch reference value when determining the touch of the plurality of second touch sensors disposed in the center region 110a of the touch panel 110 .

In addition, the microcontroller unit (MCU) determines the touch of a plurality of third touch sensors disposed in the region 110d between the upper region 110b and the center region 110a of the touch panel 110 . The third touch reference value is applied.

In addition, the microcontroller unit (MCU) determines the touch of a plurality of third touch sensors disposed in the region 110e between the lower region 110c and the center region 110a of the touch panel 110 . The third touch reference value is applied.

The capacitance detection unit 162 of the touch sensing unit 160 receives the capacitance charged in each of the plurality of touch sensors 120 , and detects a change in capacitance of each touch sensor 120 . Thereafter, the microcontroller unit (MCU) selectively applies the first touch reference value, the second touch reference value, and the third touch reference value described above according to the respective positions of the plurality of touch sensors 120 to determine whether there is a touch or not. Sense the position.

As another example of the present invention, a plurality of touch reference values are selectively applied when determining a touch according to the positions of the plurality of touch sensors 120 disposed on the touch panel 110 . In this case, as the distance from the upper and lower ends 110b and 110c of the touch panel 110 increases, the touch reference value applied to the touch determination is decreased.

Accordingly, the touch reference value applied to the touch determination of the plurality of touch sensors disposed on the upper and lower ends 110b and 110c of the touch panel 110 is the largest. In addition, the touch reference value applied to the touch determination of the plurality of touch sensors disposed in the center region 110a of the touch panel 110 is the smallest.

The core configuration and functions of the touch display apparatus 100 according to the embodiment of the present invention described above will be summarized and described below. The touch display apparatus 100 according to an embodiment of the present invention includes a touch panel 110 and a driving circuit unit. A plurality of touch sensors 120 are disposed on the touch panel 110 , and each of the plurality of touch sensors 120 is connected to a plurality of touch lines 122 . The driving circuit unit includes a source/touch driving unit 130 and a touch sensing unit 160 . The source/touch driver 130 is connected to the plurality of touch lines 122 and supplies a touch driving signal to the plurality of touch sensors 120 . In addition, the touch sensing unit 160 detects a change in capacitance received from the plurality of touch sensors 120 .

A microcontroller unit (MCU) senses the presence and absence of a touch and a position based on a change in capacitance of each touch sensor 120 . Here, the microcontroller unit (MCU) selectively applies a plurality of touch reference values when determining a touch according to a location where the plurality of touch sensors 120 are disposed on the touch panel 110 .

The touch sensing unit 160 of the touch display apparatus 100 according to an embodiment of the present invention includes a touch reference value setting unit 164 and a capacitance detecting unit 162 . The touch reference value setting unit 164 sets a plurality of touch reference values that are differently applied according to the location of the touch sensor 120 . In addition, the capacitance detection unit 162 detects a change in capacitance of each touch sensor 120 , converts an analog capacitance value into digital touch data, and transmits it to a micro controller unit (MCU).

The touch display apparatus 100 according to an embodiment of the present invention includes a micro controller unit (MCU). The microcontroller unit (MCU) selectively applies the plurality of touch reference values according to the positions of the plurality of touch sensors 120 to determine the presence or absence of a touch and a location thereof.

When the microcontroller unit (MCU) of the touch display apparatus 100 according to an embodiment of the present invention determines a touch of a plurality of first touch sensors disposed above and below the touch panel 110 , the first touch reference value apply In addition, the microcontroller unit (MCU) applies a second touch reference value smaller than the first touch reference value when determining touches of the plurality of second touch sensors disposed in the center region of the touch panel 110 .

When the microcontroller unit (MCU) of the touch display apparatus 100 according to an embodiment of the present invention determines a touch of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors, The first touch reference value is applied.

When the microcontroller unit (MCU) of the touch display apparatus 100 according to an embodiment of the present invention determines touches of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors, A third touch reference value smaller than the first touch reference value and larger than the second touch reference value is applied.

It has been described above that the touch driving unit 135b, the touch sensing unit 160, and the microcontroller unit (MCU) are arranged separately from each other. However, the present invention is not limited thereto, and the touch driving unit 135b, the touch sensing unit 160, and the microcontroller unit (MCU) may be configured as one touch driving circuit. In this case, the touch driving circuit may be disposed on a separate printed circuit board, or the touch driving circuit may be disposed on the main board. In addition, the touch driving circuit may be configured as a single chip.

In the above description, it has been described that a plurality of touch reference values are generated and applied in real time, but the present invention is not limited thereto, and a plurality of touch reference values may be stored in a separate memory. In this case, the microcontroller unit (MCU) may selectively load a plurality of touch reference values stored in the memory and use them for touch determination.

The in-cell touch type touch display device and the driving method thereof according to the present invention can uniformly maintain the touch sensitivity of the entire touch sensor regardless of the position of the touch sensor.

In addition, the in-cell touch type touch display device and the driving method thereof according to the present invention can prevent the touch sensitivity of the touch sensor from decreasing as the distance from the source/touch driver increases.

In addition, the in-cell touch type touch display apparatus and the driving method thereof according to the present invention can prevent the touch sensitivity of the touch sensors disposed in the center area of the touch panel from decreasing.

Those skilled in the art to which the present invention pertains will 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 panel
110a: center area of touch panel
110b: upper area of touch panel
110c: lower area of touch panel
110d: the area between the top and center of the touch panel
110e: the area between the lower part and the center of the touch panel
120: touch sensor
122: touch line
130: source / touch driving unit
135: source/touch driving IC
135a: data driver
135b: touch driving unit
140: gate driver
145: gate driving IC
150: timing controller
160: touch sensing unit
162: capacitance detection unit
164: touch reference value setting unit
170: power supply

Claims (16)

a touch panel on which a plurality of touch sensors are disposed;
a plurality of touch lines connected to each of the plurality of touch sensors;
a source/touch driver connected to the plurality of touch lines and configured to supply a touch driving signal to the plurality of touch sensors; and
a touch sensing unit detecting a change in capacitance received from the plurality of touch sensors and setting a plurality of touch reference values serving as a reference for touch detection; and
Includes; MCU (Micro Controller Unit) sensing the presence and location of a touch based on the capacitance change value of the plurality of touch sensors;
The microcontroller unit (MCU) selectively applies a plurality of touch reference values when determining a touch according to a position where the plurality of touch sensors are disposed on the touch panel,
In the touch panel, as the distance between the source/touch driver and the touch sensor increases, the touch reference value applied when determining the touch decreases. According to claim 1,
The touch sensing unit may include: a touch reference value setting unit configured to set a plurality of touch reference values; and
A touch display device comprising a; a capacitance detection unit for detecting a change in capacitance received from the plurality of touch sensors. 3. The method of claim 2,
The source/touch driving unit is disposed at the top and bottom of the touch panel,
The touch reference value setting unit sets a first touch reference value as a reference for determining a touch of a plurality of first touch sensors disposed in an upper area and a lower area of the touch panel, and sets a plurality of touch reference values disposed in the center area of the touch panel. set a second touch reference value as a reference for determining the touch of the second touch sensor,
The microcontroller unit (MCU) applies a first touch reference value when determining a touch of a plurality of first touch sensors disposed in an upper region and a lower region of the touch panel, and applies a first touch reference value to the plurality of first touch sensors disposed in the center region of the touch panel. When determining the touch of the touch of the second touch sensor, the second touch reference value is applied,
The first touch reference value is the largest among the plurality of touch reference values, and the second touch reference value is the smallest among the plurality of touch reference values. delete 4. The method of claim 3,
The microcontroller unit (MCU) applies the first touch reference value when determining touches of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors. 4. The method of claim 3,
The touch reference value setting unit sets a third touch reference value as a reference for determining touch of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors, and the third touch reference a value is smaller than the first touch reference value and greater than the second touch reference value;
The microcontroller unit (MCU) applies the third touch reference value when determining the touch of the plurality of third touch sensors. delete delete delete A plurality of touch reference values are selectively applied when determining a touch according to the positions of a plurality of touch sensors disposed on the touch panel,
A method of driving a touch display apparatus for reducing a touch reference value applied to touch determination as the distance between the source/touch driver connected to the upper and lower portions of the touch panel and the touch sensor increases. 11. The method of claim 10,
The touch reference value applied to the touch determination of the plurality of touch sensors disposed in the upper area and the lower area of the touch panel is the largest, and the touch reference applied to the touch determination of the plurality of touch sensors disposed in the center area of the touch panel A method of driving a touch display device with the smallest value. a touch driving unit supplying a touch driving signal to a plurality of touch sensors disposed on the touch panel;
a touch sensing unit sensing a change in capacitance of each of the plurality of touch sensors; and
A microcontroller unit (MCU) for sensing the presence or absence of a touch and a touch position based on a change in capacitance of each of the plurality of touch sensors; includes;
The microcontroller unit (MCU) selectively applies a plurality of touch reference values when determining a touch according to a position where the plurality of touch sensors are disposed on the touch panel,
A touch driving circuit in which a touch reference value applied at the time of determining the touch decreases as the distance between the touch driving unit and the touch sensor increases in the touch panel. 13. The method of claim 12,
The touch driving unit is disposed at the top and bottom of the touch panel,
The touch sensing unit sets a first touch reference value that is a reference for determining a touch of a plurality of first touch sensors disposed in an upper area and a lower area of the touch panel, and sets a first touch reference value disposed in a center area of the touch panel. 2 Set a second touch reference value that is a standard for touch determination of the touch sensor,
The microcontroller unit (MCU) applies a first touch reference value when determining a touch of a plurality of first touch sensors disposed in an upper region and a lower region of the touch panel, and applies a first touch reference value to the plurality of first touch sensors disposed in the center region of the touch panel. When determining the touch of the touch of the second touch sensor, the second touch reference value is applied,
The first touch reference value is the largest among the plurality of touch reference values, and the second touch reference value is the smallest among the plurality of touch reference values. delete 14. The method of claim 13,
The microcontroller unit (MCU) is a touch driving circuit configured to apply the first touch reference value when determining touches of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors. 14. The method of claim 13,
The touch sensing unit sets a third touch reference value that is a reference for determining touch of a plurality of third touch sensors excluding the plurality of first touch sensors and the plurality of second touch sensors, and the third touch reference value is smaller than the first touch reference value and greater than the second touch reference value;
The microcontroller unit (MCU) is a touch driving circuit configured to apply the third touch reference value when determining the touch of the plurality of third touch sensors.

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