KR20200055342A - Touch display device and method of driving the same - Google Patents

Abstract

The present invention relates to a touch display device including a plurality of touch sensors in a single touch sensing unit to reduce the size of a touch sensing circuit and improve touch performance, and a driving method thereof. The touch display device comprises: a touch sensor which corresponds to each of a plurality of pixel regions, and senses a touch input in each of the plurality of pixel regions to convert the touch input into an electrical signal; a first touch sensing line electrically connecting the touch sensors; a touch sensing unit connected to N of the first touch sensing lines; a touch IC to transmit a touch driving signal to the touch sensing unit, or receive a touch sensing signal from the touch sensing unit to process a touch input; a multiplexer which is connected to M of the touch sensing units and the touch IC, selects one among the M touch sensing units, and transfers a touch driving signal outputted by the touch IC to the selected touch sensing unit, or transfers a touch sensing signal outputted by the selected touch sensing unit to the touch IC; and a second touch sensing line electrically connecting the M touch sensing units and the multiplexer.

Description

Touch display device and its driving method {TOUCH DISPLAY DEVICE AND METHOD OF DRIVING THE SAME}

The present invention relates to a touch-recognizable display device, and more particularly, to a touch display device and a driving method for reducing touch size, manufacturing cost, power consumption and improving touch performance.

With the development of computer and broadcast communication-related technologies that have grown explosively since the end of the 20th century, the world, including Korea, has entered the information age in earnest, and accordingly, to accurately and clearly express a large amount of useful information distributed in society. The demand for various display devices is increasing day by day.

In response to these demands, a liquid crystal display (LCD), a plasma display panel (PDP), a field emission display (FED), an organic light emitting diode display (OLED) Various flat panel displays such as Display) have been developed, and these flat panel displays have the advantages of being thin, light, and low in power consumption compared to the existing CRT (Cathode Ray Tube). Is rapidly replacing the CRT.

In addition, recently, a touch display device to which a touch screen that can be driven by touching a surface of a display panel is applied has been developed and attracting attention from users.

In addition to being used as an output means for displaying an image, a touch screen is used as an input means for receiving a user's command by touching a specific location on the display panel. The position directly contacted by a hand, stylus pen, or other object is converted into an electrical signal.

The method of detecting location information and converting it into an electrical signal can be classified into a decompression method, a capacitive method, an infrared method, and an ultrasonic method, and the converted electric signal is received as an input signal and processed by a processor or other processing device. Can be.

The touch screen can be divided into an add-on type display device, a touch screen on-cell type display device, and an in-cell type display device according to its structure. Among them, the touch screen-attached display device is a method in which after the display device and the touch screen are individually manufactured, the touch screen is attached to the top of the display device. In addition, the touch screen top display device is a method of directly forming elements constituting the touch screen on the surface of the upper glass substrate of the display device. Lastly, a touch screen integrated display device has an advantage in that a touch screen is embedded inside the display device, and the thickness of the display device is reduced and surface reflection due to external light is reduced.

The touch display device detects a display panel, a data driver applying a data signal to a thin film transistor located on the display panel through a data line, a gate driver applying a scan signal to the thin film transistor located on the display panel through a gate line, and sensing a touch input. It includes a touch sensor for converting to an electrical signal, a touch panel including the same, a touch sensing circuit unit for driving the touch sensors and processing the electrical signal converted by the touch sensor. In addition, the touch sensing circuit unit includes a touch IC and a micro control unit that receives and processes signals sensed by the touch sensors along with driving the touch sensors, and the touch sensors are connected to the touch ICs through touch lines, respectively.

Since the number of touch sensors is connected to the touch IC through the touch line, there is a limitation in designing a small size of the touch sensing circuit. In addition, it takes time as much as {the detection time of the multiplexer x the number of multiplexers} in detecting whether or not the touch occurs, but if the detection time of the multiplexer is reduced, the touch performance decreases, resulting in a problem that the touch position cannot be accurately detected.

An object of the present invention is to solve the above problems, by connecting a plurality of touch sensors to one touch sensing unit to reduce the size of the touch sensing circuit unit and provides a touch display device and a driving method for improving the touch performance Is to do.

In order to achieve the above object, the present invention, each corresponding to a plurality of pixel areas, and a touch sensor for detecting a touch input in the plurality of pixel areas and converting them into electrical signals; A first touch sensing line to which the touch sensors are electrically connected; There is provided a touch panel including a touch sensing unit connected to N first touch sensing lines.

And, the number of N first touch sensing lines connected to one touch sensing unit provides two or more touch panels.

Another embodiment of the present invention, each of which corresponds to a plurality of pixel areas, and a touch sensor for detecting a touch input in the plurality of pixel areas and converting them into electrical signals; A first touch sensing line to which the touch sensors are electrically connected; A touch sensing unit connected to N first touch sensing lines; A touch IC that transmits a touch driving signal to the touch sensing unit or receives a touch detection signal from the touch sensing unit and processes a touch input; Connected to the M touch sensing units and the touch IC, selects one of the M touch sensing units, transmits a touch driving signal output from the touch IC to the selected touch sensing unit, or the selected touch sensing unit A multiplexer transmitting the touch sensing signal output from the touch IC to the touch IC; There is provided a touch display device including a second touch sensing line electrically connected to each of the M touch sensing units and the multiplexer.

In addition, the number of N first touch sensing lines connected to one touch sensing unit provides two or more touch display devices.

In addition, centering on the position (T) of the touch sensor that generates the maximum electrical signal (E1), the position (T) of the touch sensor continuously adjacent to each other in the up, down, left, right direction A, B, Electrical signals of medium intensity (E2) are detected from the C and D touch sensors, and the electrical signals of medium intensity from the E, F, G, and H touch sensors are continuously adjacent to each other in the diagonal directions of upper left, lower left, upper right, and lower right. When (E2) is detected, a touch display device is provided for determining the position T of the touch sensor as a position where a touch occurs.

The number of touch sensors (A, B, C, D, E, F) in which the electrical signals (E2) of medium intensity are detected by continuously adjoining in the diagonal directions of up, down, left, right and left, left, right, and bottom. , G, H) each provides one touch display device.

From the touch area T where the signal E1 of the maximum electric strength is sensed, four touch areas U located at I, J, K, and L intervals in the up, down, left, and right directions, respectively, are four. In a rectangular touch area that is a boundary of a side, the touch sensor signal E2 having a medium intensity is detected by a touch sensor that includes the touch areas U which are the boundary and which corresponds to a touch area excluding the touch area T. When is detected, it provides a touch display device for determining the touch area (T) to the location where the touch occurred.

In another embodiment of the present invention, there is provided a touch display device including a touch sensing unit electrically connected to N touch sensors, the multiplexer selecting one of the M touch sensing units; A touch IC transmitting a touch driving signal to the selected touch sensing unit through the multiplexer; The touch sensor electrically connected to the selected touch sensing unit detects a touch input, converts it into a touch sensing signal, transmits it to the selected touch sensing unit, and the selected touch sensing unit sends a touch sensing signal to the touch IC through a multiplexer. Transmitting; It provides a method of driving a touch display device comprising the step of processing the touch input by receiving a touch detection signal by the touch IC.

In addition, the number of N first touch sensing lines connected to one touch sensing unit provides a method of driving a touch display device having two or more.

In addition, the step (S1) of searching for the position (T) of the touch sensor generating the maximum electrical signal (E1); Detecting whether an electric signal E2 of a medium intensity is detected from A, B, C, and D touch sensors adjacent to each other continuously in the up, down, left, and right directions at the position T of the touch sensor (S2) )Wow; Detecting whether electric signals E2 of medium intensity are detected from E, F, G, and H touch sensors, which are successively adjacent in the diagonal directions of the upper left, lower left, upper right, and lower right at the position T of the touch sensor ( S3); It provides a method of driving a touch display device comprising the step of determining the position (T) of the touch sensor to the location where the touch occurs when the electrical signal is detected in the steps S2, S3.

The number of touch sensors (A, B, C, D, E, F) in which the electrical signals (E2) of medium intensity are detected by continuously adjoining in the diagonal directions of up, down, left, right and left, left, right, and bottom. , G, H) provide a driving method for each one touch display device.

From the touch area T where the signal E1 of the maximum electric strength is sensed, four touch areas U located at I, J, K, and L intervals in the up, down, left, and right directions, respectively, are four. In a rectangular touch area that is a boundary of a side, the touch sensor signal E2 having a medium intensity is detected by a touch sensor that includes the touch areas U which are the boundary and which corresponds to a touch area excluding the touch area T. When is detected, provides a method of driving a touch display device that determines the touch area T as a location where a touch occurs.

As described above, the touch display device of the present invention can reduce the number of touch lines connected to the touch IC by grouping a plurality of touch sensors into one group, and as a result, reduce the size of the touch sensing circuit unit. In addition, as the number of multiplexers decreases together, the touch sensing time allocated to one multiplexer increases, thereby improving touch performance.

1 is a view showing the configuration of a touch display device of the present invention.
2 is a view illustrating a touch display device in which one touch sensor is connected to one touch sensing unit as a first embodiment of the present invention.
3 is a view showing a touch display device in which two touch sensors are connected to one touch sensing unit according to a second embodiment of the present invention.
4A and 4B are diagrams illustrating a method of detecting a location where a touch occurs in a configuration in which two touch sensors are connected to one touch sensing unit.
5 is a diagram illustrating a driving pulse applied to a multiplexer in a configuration in which one touch sensor is connected to one touch sensing unit.
6 is a view showing a driving pulse applied to a multiplexer in a configuration in which two touch sensors are connected to one touch sensing unit.

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

In the present invention, an area including a plurality of adjacent pixels is defined as a touch area. In addition, a set of pixels or touch blocks positioned in the horizontal direction and a set of touch sensors is defined as a row, and a set of pixels or touch blocks positioned in the vertical direction and a set of touch sensors is defined as a column. The number of rows increases from top to bottom, and the number of columns increases from left to right. And, the coordinates where the touch area and the touch block are located are indicated by {number of rows, number of columns} based on the upper left, and the first and row and columns start from 1, respectively.

1 is a view showing the configuration of a touch display device of the present invention.

The touch display device according to an exemplary embodiment of the present invention includes the display panel 100 and the touch panel 200, the touch sensing circuit unit 300, the timing controller 400, the gate driver 500, and the data driver 600. do.

As an embodiment of the present invention, an in-cell type touch screen, which is an integrated type of a capacitive type, is shown, and accordingly, the touch panel 200 is embedded inside the display panel 100.

The display panel 100 is composed of pixels in a matrix form to display an image. In the present invention, various display devices such as a liquid crystal display (LCD), an organic light emitting diode display (OLED), and an electrophoretic display can be used as a display panel. have.

The first substrate of the display panel 100 includes a plurality of gate lines GL1 to GLm configured to be spaced apart and spaced apart at predetermined intervals, and data wirings DL1 to DLn crossing the gate lines GL1 to GLm to define a pixel area. It is equipped.

A thin film transistor (not shown) is formed at the intersection of the gate lines GL1 to GLm and the data lines DL1 to DLn, and a pixel electrode (not shown) and a common electrode (not shown) are formed in the pixel area where an image is displayed. It is provided.

In addition, a black matrix (not shown), a color filter layer (not shown), or the like may be formed on the second substrate of the display panel 100.

The touch panel 200 is built in the display panel 100 to sense a touch input from a touch display device according to a touch driving signal, and the touch sensing circuit unit 300 applies a touch driving signal to the touch panel 200. And, it receives a touch detection signal from the touch panel 200 and serves to process the touch input. The touch panel 200 and the touch sensing circuit unit 300 will be described in detail later.

The timing controller 400 receives timing signals such as a vertical sync signal (Vsync), a horizontal sync signal (Hsync), a data enable signal (Data Enable, DE), and a main clock (Main Clock, MCLK) from the host system 700. After receiving and processing the input, it is transmitted to the gate driver 500 and the data driver 600. Signals for controlling the operation timing of the gate driver 500 include a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (Gate Output Enable, GOE), and the like. The signal that controls the operation timing of the data driver 600 includes a source start pulse (SSP), a source shift clock (SSC), a source output enable signal (Source Output Enable, SOE), Polarity control signals (Polarity, POL) are included.

The gate driver 500 shifts the gate start pulse GSP transmitted from the timing controller 400 according to the gate shift clock GSC, and sequentially applies the gate on voltage Von to the gate lines GL1 to GLm. The gate signal is provided, and the gate signal includes a gate scan signal. In addition, the gate-off voltage Voff is supplied to the gate lines GL1 to GLm during the remaining period when the gate signal of the gate-on voltage Von is not supplied.

The data driver 600 generates a sampling signal by shifting a source start pulse (SSP) from the timing controller 400 according to a source shift clock (SSC). Then, the data driver 600 latches the image data RGB input according to the source shift clock SSC according to the sampling signal, changes it into a data signal, and then horizontal lines in response to the source output enable (SOE) signal. Data signals are supplied to the data lines DL1 to DLn in units. To this end, the data driver 600 may include a data sampling unit (not shown), a latch unit (not shown), a digital-to-analog conversion unit (not shown), and an output buffer (not shown).

2 is a view illustrating a touch display device in which one touch sensor is connected to one touch sensing unit as a first embodiment of the present invention.

The touch panel 200 may be built in the display panel 100 and detect a location touched by a user according to a touch driving signal, and transmit a function to the touch sensing circuit 300. The touch panel 200 includes a touch block 210, a touch sensor 220, and a first touch sensing line 231.

The touch block 210 corresponds to the touch area 110 of the display panel 100. The touch block 210 includes a touch sensor 220 and detects a touch input from the touch area 110 by a user of the touch display device.

The touch sensor 220 may be applied with a capacitive method or a decompression method. In particular, the capacitive type touch sensor is generated by changing the electric field existing between two electrodes provided inside the touch sensor when directly touching the human body or touching a conductive object through which other electric current can flow. Whether or not the touch is detected through a change in the amount of charge charged between the electrodes.

One touch sensor 220 is connected to one first touch sensing line 231 and receives a touch driving signal from the touch sensing circuit 300 through the first touch sensing line 231, or a touch sensing circuit ( 300) to transmit a touch detection signal.

The touch sensing circuit unit 300 may include a touch IC 310, a micro control unit 320, a multiplexer unit 330, and a touch sensing unit unit 340.

The touch IC 310 may be formed of a readout IC (ROIC), and transmits a touch driving signal to the touch sensor 220 located on the touch panel 200 according to a control command of the micro control unit 320, thereby providing a touch sensor ( 220) to perform an operation for detecting a touch input. In addition, a touch input signal is processed by receiving a touch detection signal from the touch sensor 220 and converting and transmitting raw data of the received analog signal into a digital signal that can be handled by the microcontrol unit 320. .

The micro control unit 320 controls operations such as touch driving or touch sensing of the touch IC 310, and detects whether a touch is input from the touch display device using data received from the touch IC 310.

Various methods may be used as an algorithm for detecting whether the micro control unit 320 has a touch input. In one embodiment, after a normal touch input is made, the amount of current flowing through the touch block is converted into digital data, and then stored as reference data. When the actual touch input is made, the low data converted by the touch IC 310 into a digital signal By comparing the and reference data, if the raw data is smaller than the reference data, it is determined that the touch input is not made, and if the raw data is larger than the reference data, it is determined that the touch input is made. When it is determined that the touch input has been made, the micro control unit 320 processes the location (coordinate information) and the identification code where the touch input is made and transmits it to the host system 700.

The multiplexer unit 330 includes a plurality of multiplexers 331, and the multiplexer 331 is connected to the touch sensing unit 341 and the touch IC 310 included in the touch sensing unit unit 340. The multiplexer 331 selects one of the plurality of second touch sensing lines 232 according to the command of the micro control unit 320, and the touch sensing unit connected to the touch IC 310 and the second touch sensing line 232 ( 341). By using the multiplexer 331, the number of channels required by the touch IC 310 can be reduced.

The touch sensing unit 340 and the touch sensing unit 341 included therein may be included in the touch sensing circuit unit 300, but are not limited thereto and may be included in the touch panel 200.

2 is an embodiment in which the touch sensing unit 341 connected to the touch sensor 220 is connected to the multiplexer 331 through the second touch sensing line 232. According to the driving command of the micro control unit 320, the multiplexer 331 selects one of two connected second touch sensing lines 232, and the touch IC 310 selects the second touch sensing line selected by the multiplexer 331. The touch driving signal is transmitted to the touch sensor 220 through the touch sensing unit 341 through 232. When a touch input is made in the touch area 110 corresponding to the touch sensor 220 receiving the touch driving signal, the touch sensor 220 touches the touch sensing signal through the touch sensing unit 341 and the multiplexer 331. Transmit to IC 310. The touch IC 310 converts the touch detection signal into digital data so that the micro control unit 320 can process it, and the micro control unit 320 processes the touch input using the touch detection signal converted into digital data. do.

However, when the multiplexer 331 is embedded in the touch sensing circuit 300, the size of the touch sensing circuit 300 increases, resulting in a problem that the unit cost increases and the line processing becomes complicated.

Particularly, as illustrated in FIG. 2, the touch sensing unit 341 connected to the touch sensor 220 located in the two adjacent touch blocks 210 is connected to one multiplexer 331 through the second touch line 232. In one case, the number of channels required by the touch IC 310 is reduced by half, but the touch sensing circuit unit 300 includes a plurality of multiplexers 331, thereby limiting the size of the touch IC 310 and the touch sensing circuit unit 300 to be miniaturized. This happens.

3 is a view showing a touch display device in which two touch sensors are connected to one touch sensing unit according to a second embodiment of the present invention.

In the vertical direction, each of the two touch sensors 220 is connected to one touch sensing unit 341 through the first touch line 231.

The touch sensing unit 341 is connected to the multiplexer 331 through the second touch line 232.

3 is an embodiment in which the touch sensing unit 341 connected to the two touch sensors 220 is connected to the multiplexer 331 through the second touch sensing line 232. According to the driving command of the micro control unit 320, the multiplexer 331 selects one of two connected second touch sensing lines 232, and the touch IC 310 selects the second touch sensing line selected by the multiplexer 331. The touch driving signal is transmitted to the touch sensor 220 through the touch sensing unit 341 through 232. When a touch input is made in the touch area 110 corresponding to the touch sensor 220 connected to the touch sensing unit 341 that has received the touch driving signal, the touch sensor 220 receives the touch detection signal through the multiplexer 331. Transmit to the touch IC 310. The touch IC 310 converts the touch detection signal into digital data so that the micro control unit 320 can process it, and the micro control unit 320 processes the touch input using the touch detection signal converted into digital data. do.

As an embodiment of the present invention, although the touch sensing unit 240 shows a configuration in which two touch sensors 220 are connected to one touch sensing unit 341, two touch sensors 220 are shown. In addition, a plurality (N) may be connected to one touch sensing unit 341. In order to design a balance between the improvement of touch performance and the complexity of the touch sensing circuit unit 300, it is preferable that the number N of touch sensors 220 connected to the touch sensing unit 341 is two.

4A and 4B are diagrams illustrating a method of detecting a location where a touch input occurs in a configuration in which two touch sensors are connected to one touch sensing unit. In order to identify the touch sensing unit 341 connected to the touch sensor 220, the number of the touch sensing unit 341 is 1A, 1B, 2A, 2B,? On the left side of the touch panel 200, respectively. Etc. For example, the touch sensor 221 positioned in the first row and one column of the touch panel 200 and the touch sensor 222 located in the nineth row and one column are connected to the 1A touch sensing unit.

In FIG. 4A, since two touch sensors 220 are connected to one touch sensing unit 341, when two touch sensors 220 transmit touch detection signals, the touch sensors 221 and 222 correspond to There is a need for a method of distinguishing whether a touch input has been made in the touch area 110. That is, even if a touch input is made in the actual touch area of {2, 3} coordinates as shown in FIG. 4B, the touch sensor of the touch block 210 corresponding to the touch area of {2, 3} coordinates and {13, 3} Since the touch sensor of the touch block 210 corresponding to the touch area is electrically connected to one touch sensing unit 2A, the micro control unit 320 receives touch input even in the touch area of {13, 3} coordinates. It can be judged as being done.

If there is no separate circuit or device in the touch sensing unit 341, it is impossible to distinguish the touch detection signals from the two touch sensors 220. However, if a separate circuit or device is applied for this, there is a limitation in miniaturizing the size of the touch sensing circuit unit 300. Accordingly, there is a need for a method of distinguishing the touch detection signals from the two touch sensors 220 connected to the touch sensing unit 341 to determine in which touch region the touch input is actually made.

The micro-control unit 320 receives a touch detection signal from the touch IC 310, and touch regions T1 and T2 corresponding to the touch sensor generating the touch detection signal E1 of the maximum electrical strength among the received touch detection signals. ). (The touch area that generated the signal of the maximum electrical intensity is expressed in dark gray. In FIG. 4, T1 is located at the coordinates {2, 3}, and T2 is located at {13, 2} coordinates.) It is searched whether the touch detection signals E2 of the middle intensity are received from the touch sensors corresponding to one touch area, which are adjacent to the upper, lower, left, and right directions centering on (T1, T2). Also, it searches whether the touch sensor signal E2 of the middle intensity is received from the touch sensors corresponding to one touch area adjacent to the left, top, left, right, and bottom diagonal directions. (Touch that generated the touch detection signal of the middle intensity) The area is expressed in light gray.) That is, it is searched to see if the touch sensing signal E2 of the medium intensity is received in other touch areas surrounding the touch areas T1 and T2 where the maximum electrical intensity signal E1 is detected. (E1> E2) When all eight adjacent touch areas receive a touch detection signal E2 of medium intensity, the touch area T1 in which the touch detection signal E1 of the maximum electric intensity surrounding them is sensed It may be determined as the location where the touch input is made.

As an embodiment of the present invention, as shown in FIG. 4B, adjacent to the upper, lower, left, and right directions adjacent to the touch area T1 where the signal E1 of the maximum electric strength is sensed, one by one, It detects whether the touch sensor corresponding to a total of 8 touch areas, each of which is adjacent to the left, right, top, and bottom right diagonal directions, receives a medium intensity touch detection signal E2, but is not limited thereto, and detects a touch with the maximum electrical intensity A, B, C, and D are searched in succession adjacent to the top, bottom, left, and right directions based on the touch area T1 where the signal E1 is detected, and diagonally in the upper left, lower left, upper right, and lower right directions. E, F, G, and H are continuously adjacent to each other, and the touch sensors corresponding to the touch areas are searched to see if a medium-strength touch detection signal E2 is received. If the touch detection signal E2 is detected, the corresponding touch area T1 ) May be determined as a location where a touch occurs.

Or, from the touch area T where the signal E1 of the maximum electric strength is sensed, the touch areas U located at I, J, K, L intervals in the up, down, left, and right directions, respectively, are 4 In a rectangular touch area that is a boundary of four sides, the touch areas U that are the boundaries, and the signal E1 having the maximum electrical strength corresponds to the touch area except for the detected touch area T If the touch sensor detects the touch detection signal E2 having a medium intensity, the touch area T may be determined as a location where the touch occurs.

A method of searching whether a touch detection signal E2 of medium intensity is detected in a radial or rectangular area based on the touch area T1 where the signal E1 of the maximum electric intensity is detected at the position where the touch input is made as described above. As described above, the present invention is not limited to this, and it is also possible to determine whether a touch detection signal E2 having a medium intensity is detected in areas such as a circle, an ellipse, and a polygon, and determine a location where the touch occurs.

If the distances (W1, W2, ...) on the coordinates of the touch area between the touch sensing unit 341 and the touch sensor 220 connected to each other are the same, the touch in which the touch detection signal E1 of the maximum electrical strength is detected Since the regions T1 and T2 and the touch regions U1 and U2 in which the middle-intensity touch detection signals E2 are received overlappingly appear, the coordinates of the touch sensors 220 connected to each touch sensing unit 341 The tops should be different.

FIG. 5 is a diagram showing driving pulses applied to a multiplexer when configuring one touch sensing unit with one touch sensor, and FIG. 6 is driving applied to a multiplexer when configuring one touch sensing unit with two touch sensors. It is a diagram showing pulses.

In order to sense the touch input, it takes time equal to {drive time (u) x number of multiplexers} of the multiplexer. Therefore, in order to reduce the time for sensing the touch input, the driving time of the multiplexer 331 or the number of multiplexers 331 must be reduced.

However, if the driving time of the multiplexer 331 is reduced, a time for accurately detecting a touch input is reduced, and thus a touch performance of the touch display device is reduced, and when the number of the multiplexers 331 is reduced, it is connected to the touch IC 310. The number of channels increases.

On the other hand, when two touch sensors 220 are connected to one touch sensing unit 341, the number of multiplexers 331 can be reduced in half, thereby miniaturizing the touch IC 310 and the touch sensing circuit unit 300. Can reduce the manufacturing cost. In addition, even if the number of multiplexers 331 is reduced, the number of channels connected to the touch IC 310 is reduced by half because the number of the touch sensors 220 connected to one multiplexer 331 is doubled.

Also, by reducing the number of multiplexers 331 in half, the driving time 2u allocated to the multiplexer 331 can be increased as shown in FIG. 6. Accordingly, the time for accurately detecting the touch input increases, thereby improving the touch performance.

As described above, the present invention is not limited to the above-described embodiments, and various modifications can be carried out without departing from the gist of the present invention and not impairing the effect.

100: display panel 110: touch area
200: touch panel 210: touch block
220: touch sensor 231: first touch line
232: second touch line 300: touch sensing circuit
310: Touch IC 320: Micro control unit
330: multiplexer unit 331: multiplexer
340: touch sensing unit 341: touch sensing unit
400: timing controller 500: gate driver
600: data driver 700: host system

Claims (12)

A touch sensor that corresponds to a plurality of pixel areas, and senses a touch input from the plurality of pixel areas and converts them into electrical signals;
A first touch sensing line to which the touch sensors are electrically connected;
A touch panel including a touch sensing unit connected to N first touch sensing lines.
According to claim 1,
The number of N first touch sensing lines connected to one touch sensing unit is two or more.
A touch sensor that corresponds to a plurality of pixel areas, and senses a touch input from the plurality of pixel areas and converts them into electrical signals;
A first touch sensing line to which the touch sensors are electrically connected;
A touch sensing unit connected to N first touch sensing lines;
A touch IC that transmits a touch driving signal to the touch sensing unit or receives a touch detection signal from the touch sensing unit and processes a touch input;
Connected to the M touch sensing units and the touch IC, selects one of the M touch sensing units, transmits a touch driving signal output from the touch IC to the selected touch sensing unit, or the selected touch sensing unit A multiplexer transmitting the touch sensing signal output from the touch IC to the touch IC;
And a second touch sensing line electrically connected between the M touch sensing units and the multiplexer.
The method of claim 3,
The number of N first touch sensing lines connected to one touch sensing unit is two or more.
The method of claim 3 or 4,
Focusing on the position (T) of the touch sensor that generates the maximum electrical signal (E1), the touch sensor's position (T) is adjacent to A, B, C, respectively, continuously adjacent in the up, down, left, and right directions. Electrical signals of medium intensity (E2) are detected from the D touch sensors, and are continuously adjacent diagonally in the upper left, lower left, upper right, and lower right directions. ) Is detected, the touch display device that determines the position (T) of the touch sensor as the location where the touch occurred.
The method of claim 5,
The number of touch sensors (A, B, C, D, E, F) in which the electrical signals (E2) of medium intensity are detected by continuously adjoining in the diagonal directions of up, down, left, right and left, left, right, and bottom. , G, H) each with 1 touch display.
The method of claim 3 or 4,
From the touch area T where the signal E1 of the maximum electric strength is sensed, four touch areas U located at I, J, K, and L intervals in the up, down, left, and right directions, respectively, are four. In a rectangular touch area that is a boundary of a side, the touch sensor signal E2 having a medium intensity is detected by a touch sensor that includes the touch areas U which are the boundary and which corresponds to a touch area excluding the touch area T. When is detected, the touch display device to determine the touch area (T) to the location where the touch occurred.
In the touch display device including a touch sensing unit electrically connected to the N touch sensors,
A multiplexer selecting one of the M touch sensing units;
A touch IC transmitting a touch driving signal to the selected touch sensing unit through the multiplexer;
The touch sensor electrically connected to the selected touch sensing unit senses a touch input, converts it into a touch sensing signal, transmits it to the selected touch sensing unit, and the selected touch sensing unit sends a touch detection signal to the touch IC through a multiplexer. Transmitting;
And the touch IC receiving a touch sensing signal and processing a touch input.
The method of claim 8,
A method of driving a touch display device in which the number of N first touch sensing lines connected to one touch sensing unit is two or more.
The method of claim 8 or 9,
Searching for a position (T) of the touch sensor generating the maximum electrical signal (E1) (S1);
Detecting whether an electric signal E2 of a medium intensity is detected from A, B, C, and D touch sensors adjacent to each other continuously in the up, down, left, and right directions at the position T of the touch sensor (S2) )Wow;
Detecting whether electric signals E2 of medium intensity are detected from E, F, G, and H touch sensors, which are successively adjacent in the diagonal directions of the upper left, lower left, upper right, and lower right at the position T of the touch sensor ( S3);
And determining the position (T) of the touch sensor as a position where a touch occurs when an electrical signal is detected in steps S2 and S3.
The method of claim 10,
The number of touch sensors (A, B, C, D, E, F) in which the electrical signals (E2) of medium intensity are detected by continuously adjoining in the diagonal directions of up, down, left, right and left, left, right, and bottom. , G, H), respectively.
The method of claim 8 or 9,
From the touch area T where the signal E1 of the maximum electric strength is sensed, four touch areas U located at I, J, K, and L intervals in the up, down, left, and right directions, respectively, are four. In a rectangular touch area that is a boundary of a side, the touch sensor signal E2 having a medium intensity is detected by a touch sensor that includes the touch areas U which are the boundary and which corresponds to a touch area excluding the touch area T. When is detected, the driving method of the touch display device to determine the touch area (T) to the location where the touch occurred.

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