KR102269989B1 - Apparatus for Driving of Touch Screen - Google Patents

Abstract

The present invention relates to a device for driving a touch screen capable of improving the touch sensing performance of a bendable touch screen. A touch screen driving device according to an embodiment of the present invention supplies a first driving signal to a first driving line disposed in a flat area of the touch screen, and a second driving signal and a second driving signal to a second driving line disposed in a bending area. A different second driving signal is supplied to prevent deterioration of touch sensing performance due to bending of the touch screen.

Description

Apparatus for Driving of Touch Screen

The present invention relates to a device for driving a touch screen capable of improving the touch sensing performance of a bendable touch screen.

A touch screen is installed in an image display device such as a liquid crystal display device, a field emission display device, a plasma display device, an electroluminescence display device, an electrophoretic display device, and an organic light emitting display device, so that a user can use a finger or a pen while viewing the display device. It is a type of input device that inputs information through direct contact with the screen.

Recently, a touch screen has been commercialized as an input device of various electronic devices such as portable information devices such as smart phones and tablet PCs, notebook computers, monitors, and televisions.

Such a touch screen may be implemented in a capacitive manner. The capacitive touch screen senses a touch input by sensing a change in capacitance when a finger or a conductive material is in contact with the touch sensor, that is, a change in charge of the touch sensor. The capacitance method is divided into a mutual capacitance method and a self capacitance method. The mutual capacitance type touch panel has the advantage of being able to implement multi-touch input compared to the self capacitance type touch panel.

In a general touch panel driving device using a capacitive method, when a conductive material is in contact (or close to), the electrostatic charge between the driving (Tx) line (touch driving line) and the sensing (Rx) line (touch sensing line) formed to cross each other. By detecting the change in capacitance, the presence or absence of touch and the touch position are detected. That is, in the touch operation mode, the driving device of the touch panel sequentially applies a driving signal to a plurality of driving (Tx) lines while using a plurality of sensing units connected one-to-one to a plurality of sensing (Rx) lines to drive a plurality of driving devices. A sensing signal corresponding to a change in capacitance is sensed through the (Tx) line. In this case, the driving signals applied to the entire driving (Tx) line (Tx channel) have the same level at the same frequency, and the sensing parameter of the touch sensing unit has the same value. Thereafter, the sensed analog sensing signal is converted into a digital signal to generate touch sensing data, and the generated sensing data is transmitted to the host system.

FIG. 1 is a diagram illustrating capacitance formed between electrodes of a general touch screen, and FIG. 2 is a diagram illustrating capacitance formed between electrodes of a band-enabled touch screen. 1 and 2 , the driving (Tx) line and the sensing (Rx) line are simplified to help understand the problem caused by bending of the touch screen.

As shown in FIG. 1 , when the general touch screen 1 is in a flat state without being bent, when the same driving signal is supplied to the touch electrodes 2 , the same capacitance Cap1 is generated between the touch electrodes 2 . this is formed

On the other hand, as shown in FIG. 2 , when a predetermined area of the touch screen 1 is bent, the distance between the touch electrodes 2 and 3 is increased due to the gap between the touch electrodes 2 and 3 is widened. The capacitance will change. That is, a first capacitance Cap1 is formed between the first touch electrodes 2 formed in the flat area, and the first capacitance Cap1 is formed between the first touch electrode 2 and the second touch electrodes 3 formed in the bending area. A second capacitance Cap2 different from the first capacitance Cap1 is formed.

When the touch screen is driven, the physical structure of the bending area is weak compared to a normal flat area, and low capacitance is formed in the touch electrodes 3 . In this way, when the capacitance of the touch electrode 3 is changed in the bending region, the amount of the fringe capacitor generated during touch also changes, and finally, the touch data generated from the charge value sensed by the touch sensing unit also changes. There is a problem in that the touch sensing performance is deteriorated.

In addition, since the area to be bent is not fixed, but can be changed at any time, and it is not possible to specify or know in advance which area is bent, a technique for preventing deterioration of touch sensing performance due to bending of the touch screen is proposed. it's not happening

The present invention is to solve the problems described above, and it is a technical task to provide a driving device for a touch screen applicable to a band-enabled touch screen.

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 driving device for a touch screen capable of preventing deterioration of touch sensing performance due to bending of the touch screen.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a touch screen driving device capable of compensating for a touch sensing signal in a bent region of a touch screen.

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.

A driving device for a touch screen according to an embodiment of the present invention for achieving the above-described technical problem is bent together with the display panel by being positioned on or within the display panel, and extending in the same first direction as the bending axis. a touch screen including lines and sensing lines insulated from the driving lines and extending in a second direction; A driving signal is supplied to driving (Tx) lines of the touch screen, a first driving signal is supplied to first driving (Tx) lines disposed in a flat area, and a second driving (Tx) line disposed in a bending area. a touch driving unit for supplying a second driving signal; a touch sensing unit generating touch data by sensing a change in capacitance of sensing lines of the touch screen; and a touch processor configured to supply a first parameter for generating a first driving signal and a second parameter for generating a second driving signal to the touch driver and detecting a touch based on the touch data.
The touch processor drives driving lines of the touch screen through the touch driving unit, compares touch data sensed from the sensing lines of the touch screen through the touch sensing unit with reference data, and according to the comparison result, Detect the occurrence, the position of the second driving lines of the touch screen located in the bending area and extending in the same first direction as the bending axis, and the position of the first driving lines of the touch screen located in the flat area and extending in the first direction position can be detected.

The touch screen driving apparatus according to an embodiment of the present invention may be applied to a band-enabled touch screen to prevent deterioration of touch sensing performance due to bending of the touch screen.

The touch screen driving apparatus according to an embodiment of the present invention may compensate for a touch sensing signal in a bent area of the touch screen.

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

1 is a diagram illustrating a capacitance formed between electrodes of a general touch screen.
2 is a diagram illustrating capacitance formed between electrodes of a band-enabled touch screen.
3 is a diagram schematically illustrating a display device to which a driving device for a touch screen according to an embodiment of the present invention is applied.
4 is a diagram illustrating an arrangement of driving (Tx) lines and sensing (Rx) lines when the band-enabled touch screen is bent in the left and right directions.
5 is a diagram illustrating an arrangement of driving (Tx) lines and sensing (Rx) lines when the band-enabled touch screen is bent in the vertical direction.
6 is a view showing a driving device for a touch screen according to an embodiment of the present invention.
7 is a diagram illustrating actual waveforms of the first driving signal P1 and the second driving signal P2 output from the touch driver.
8 is a diagram illustrating a touch sensing unit of a driving device for a touch screen according to an embodiment of the present invention.
9 to 12 are diagrams illustrating a touch sensing method of a driving apparatus for a touch screen according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a driving device for a touch screen of the present invention will be described in detail. 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.

Advantages and features of the present invention and methods of 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 common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

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. 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 of the embodiments may be implemented independently of each other or may be implemented together in a related relationship. may be

3 is a diagram schematically illustrating a display device to which a driving device for a touch screen according to an embodiment of the present invention is applied.

Referring to FIG. 3 , the display device includes a display panel 300 , driving circuit units 310 , 320 , 330 of the display panel, a touch screen 100 , and a touch driving device 200 .

Here, the touch screen 100 and the display panel 300 are bendable or bendable band-enabled device. The touch screen 100 may be applied to the display device in an add-on, on-cell or in-cell manner.

The driving circuit units 310 , 320 , and 330 of the display panel include a timing controller 310 , a gate driver 320 , and a data driver 330 . Since the display panel 300 and the driving circuit units 310 , 320 , and 330 of the display panel are well known, detailed descriptions thereof will be omitted.

The touch screen driving apparatus 200 according to an embodiment of the present invention includes a touch processor 210 , a touch driving unit 220 , and a touch sensing unit 230 . A detailed description of the touch screen driving device 200 will be described later with reference to FIGS. 6 to 11 .

4 is a view showing the arrangement of driving (Tx) lines and sensing (Rx) lines when the band-able touch screen is bent in the left and right directions, and FIG. 5 is the driving when the band-able touch screen is bent in the vertical direction. A diagram illustrating an arrangement of (Tx) lines and sensing (Rx) lines.

4 and 5 , the touch screen 100 includes a plurality of driving (Tx) lines 110 and a plurality of sensing (Rx) lines crossing the plurality of driving (Tx) lines 110 . (120). Mutual capacitance is formed at nodes at intersections of the driving (Tx) lines 110 and the sensing (Rx) lines 120 .

As shown in FIG. 4 , in the present invention, when the touch screen 100 is bent in the left and right directions, the driving (Tx) lines 110 are vertically arranged among the touch electrodes, and the sensing (Rx) lines ( 120) in the horizontal direction.

As shown in FIG. 5 , in the present invention, when the touch screen 100 is bent in the vertical direction, driving (Tx) lines 110 are arranged in a horizontal direction among the touch electrodes, and sensing (Rx) lines are formed. (120) is placed in the vertical direction.

The reason for disposing the driving (Tx) lines 110 and the sensing (Rx) lines 120 in this form is the driving (Tx) lines ( 110) is arranged to reduce the effect of banding when the driving signal is applied, and this is because it is advantageous in obtaining raw data.

On the other hand, if the driving (Tx) lines 110 are arranged so that the touch screen 100 is perpendicular to the bending/bending axis, the bending affects all the driving (Tx) lines 110 , and this causes the driving (Tx) lines 110 to be bent. A deviation of the driving signal occurs between the driving (Tx) lines 110 from the time the signal is input, so that the touch sensing is not performed smoothly.

The driving (Tx) lines 110 and the sensing (Rx) lines 120 may be formed to cross each other at different layers with an insulating layer interposed therebetween. Meanwhile, the driving (Tx) lines 110 and the sensing (Rx) lines 120 may be formed on the same layer. In this case, the driving (Tx) lines 110 and the sensing (Rx) lines ( In a region where 120 intersects, the two lines 110 and 120 are separated by an insulating layer. A bridge pattern is formed at the intersection of the driving (Tx) lines 110 and the sensing (Rx) lines 120 so that the separated driving (Tx) lines or sensing (Rx) lines are connected to each other do.

The touch screen driving device 200 according to an embodiment of the present invention senses the amount of charge change in the touch electrode before and after the touch, and determines whether a conductive material such as a finger is touched and its location. The touch screen driving device 200 supplies driving signals to driving (Tx) lines and receives charges from touch sensors through sensing (Rx) lines in synchronization with the driving signals. Thereafter, a touch presence and a touch position are determined by sensing the amount of change of charge received from the sensing (Rx) lines. In this case, the driving signal applied to the driving (Tx) lines may be generated in various forms, such as a square wave pulse, a sine wave, or a triangular wave.

6 is a view showing a driving apparatus for a touch screen according to an embodiment of the present invention, and FIG. 7 is a view showing actual waveforms of the first driving signal P1 and the second driving signal P2 output from the touch driving unit. .

6 and 7 , when bending occurs in the touch screen 100 , the touch screen driving device 200 senses the bending area. In addition, a first driving signal is supplied to first driving (Tx) lines disposed in a flat area of the touch screen 100 and a second driving signal is supplied to second driving (Tx) lines disposed in a bending area of the touch screen 100 . do. As described above, different driving signals are supplied to the first driving (Tx) lines disposed in the flat area and the second driving (Tx) lines disposed in the bending area, and thus the bending area is caused by bending of the touch screen 100 . Compensate for touch data sensed by the touch electrodes disposed on the . Through this, even if bending occurs in the touch screen 100, it is possible to prevent deterioration of the touch sensing performance.

To this end, the touch screen driving device 200 according to an embodiment of the present invention is configured to include a touch processor 210 , a touch driving unit 220 , and a touch sensing unit 230 .

The touch processor 210 is a finger digital signal processor (DSP) that senses the user's touch presence and touch position, and receives touch data from the touch sensing unit 230 and performs a touch algorithm. The input touch data is calculated and processed into meaningful raw data. The touch processor 210 detects the presence or absence of the user's touch and the coordinates at which the touch is made through analysis of the touch data.

Also, when the touch screen 100 is bent, the touch processor 210 analyzes touch data received from all sensing (Rx) lines to determine whether or not the touch screen 100 is bent and any driving (Tx) lines in the bending area. Detect if they are placed.

The touch processor 210 provides a voltage, a frequency, a gain voltage, and an integration number so that different driving signals can be supplied to the driving (Tx) lines disposed in the flat region and the bending region. ) value, and supplies data of a voltage, a frequency, a gain voltage, and an integration count to the touch driver 220 .

Here, a first parameter (voltage, frequency, gain voltage, and accumulated number of data) for generating a first driving signal supplied to the first driving (Tx) lines disposed in the flat area, and the first parameter disposed in the bending area The second parameters (voltage, frequency, gain voltage, and accumulated number of data) for generating the second driving signal supplied to the second driving (Tx) lines are differently generated and supplied to the touch driving unit 220 .

For example, the touch processor 210 stores a plurality of data for each of a voltage, a frequency, a gain voltage, and an accumulation number for generating a first driving signal according to the first parameter and a second driving signal according to the second parameter, and have. That is, a plurality of voltage data, a plurality of frequency data, a plurality of gain voltage data, and a plurality of accumulated count data are stored, and one of the plurality of data is selected based on the sensing result of the bending area and transmitted to the touch driver 220 . supply

In this case, as a first parameter for generating the first driving signal supplied to the first driving (Tx) lines disposed in the flat area, one of a plurality of voltages is selected, one of the plurality of frequencies is selected, and the plurality of One of the gain voltages may be selected, one may be selected from among a plurality of accumulated times, and the selected data may be modulated by a PWM method and supplied to the touch driver 220 .

In addition, as a second parameter for generating a second driving signal supplied to the second driving (Tx) lines disposed in the bending region, one of a plurality of voltages is selected, one of the plurality of frequencies is selected, and a plurality of It is possible to select one of the gain voltages, select one from a plurality of accumulated times, and modulate the selected data in a PWM method to supply it to the touch driving unit 220 . The touch driving unit 220 is supplied from the touch processor 210 . A plurality of different driving signals are generated according to the first parameter (voltage, frequency, gain, accumulated count value) and the second parameter (voltage, frequency, gain voltage, and accumulated count value).

First, the touch sensing unit 230 can accurately perform touch sensing in the flat area and the bending area only when the data of the gain and the accumulated number of the first and second drive signals are recognized. To this end, the touch driver 220 synchronizes the gain voltage and the accumulated number of data of the first parameter and the second parameter with a clock signal and supplies it to the touch sensing unit 230 . And, the touch driver 220 As shown in FIG. 7A , the first driving signal P1 is generated based on the first parameter, and the first driving signal P1 is applied to the first driving (Tx) lines disposed in a flat area. supply

In addition, as shown in FIG. 7B , the touch driver 220 generates a second driving signal P2 based on the second parameter, and transmits the second driving signal P2 to the second driving (Tx) lines disposed in the bending area. A second driving signal P2 is supplied.

7(a) and 7(b) show actual waveforms obtained by measuring the signal of the output pin of the touch driving unit 220 of the first driving signal P1 and the second driving signal P2 output from the touch driving unit. will indicate When the output waveforms of the output pin of the touch driver 220 are compared, the first driving signal P1 output to the first driving (Tx) lines in the flat region and the second driving (Tx) lines in the bending region are outputted. It can be clearly seen with the naked eye that the second driving signal P2 is formed to have different voltages, frequencies, and gain voltages.

Here, the second driving signal supplied to the second driving (Tx) lines arranged in the bending region so that the touch data sensed by the touch electrodes arranged in the bending region can be compensated for by the bending of the touch screen 100 . At (P2), the voltage, frequency, and gain voltage are increased compared to the first driving signal (P1). Meanwhile, the voltage, frequency, and gain voltage of the second driving signal P2 supplied to the second driving (Tx) lines disposed in the bending region may be lower than that of the first driving signal P1 .

The voltage, frequency, and frequency of the second driving signal P2 supplied to the driving (Tx) lines arranged in the bending region individually for each driving (Tx) line according to the capacitor size of the driving (Tx) lines arranged in the bending region; A gain voltage can be set.

Taking the frequency as an example, assuming that the clock frequency of the touch driver 220 is 1 MHz, frequency data input from the touch processor 210 may have a value of 1-5.

When the frequency data has a value of 1, the touch driving unit 220 generates a driving signal having a frequency of 1 MHz, and when the frequency data has a value of 2, the touch driving unit 220 generates a driving signal having a frequency of 500 KHz, and the frequency data has a value of 3, the touch driving unit 220 generates a driving signal having a frequency of 400KHz, and when the frequency data has a value of 4, the touch driving unit 220 generates a driving signal having a frequency of 300KHz, and the frequency data is 5 With a value of , the touch driving unit 220 may generate a driving signal having a frequency of 200 KHz.

In addition, the touch driver 220 is provided with a level shifter to adjust the voltage value of the driving signal according to the input voltage data.

When the second capacitance formed in the driving (Tx) lines disposed in the bending region is smaller than the first capacitance formed in the driving (Tx) lines disposed in the flat region, the voltage and frequency of the second driving signal P2 , by increasing the gain voltage and the number of accumulations, it is possible to compensate the capacitance reduced by the banding to the original size.

Conversely, if the second capacitance formed in the driving (Tx) lines disposed in the bending region is greater than the first capacitance formed in the driving (Tx) lines disposed in the flat region, the voltage of the second driving signal P2, By reducing the frequency, the gain voltage, and the number of accumulations, the capacitance increased by the banding can be compensated to the original size.

Here, the second driving signal P2 may be generated by changing all of the voltage, frequency, gain voltage, and accumulation number, and one to three parameters among voltage, frequency, gain voltage, and accumulation number may be selectively changed to obtain the second driving signal P2. The second driving signal P2 may be generated. In this way, when the second driving signal is generated by selecting at least one of the voltage, the frequency, the gain voltage, and the accumulated number, the capacitance reduced by the banding can be precisely compensated.

8 is a diagram illustrating a touch sensing unit of a driving device for a touch screen according to an embodiment of the present invention.

Referring to FIG. 8 , the touch sensing unit 230 includes a mutual sensing unit 231 (MSU), an amplifier 232, a mux 233, MUX, and an analog-to-digital converter 234 (ADC).

The mutual sensing unit 231 senses the amount of change in capacitance of each node of the touch screen generated by the touch, and accumulates the amount of change in capacitance as a signal using a built-in integrator to generate a change in capacitance do. Thereafter, the accumulated capacitance change value is supplied to the amplifier 232 every predetermined time. At this time, the sensing values in each sensing (Rx) line are accumulated based on the accumulated count data input from the touch driver 220 . And, at this time, the capacitance change value is generated based on the gain voltage supplied from the touch driver 220 . The amplifier 232 may apply a sampling and hold amplifier, and the mutual sensing unit 231 . ) and sample the input capacitance change value. Also, if a signal is introduced while the analog-to-digital converter 234 is working, an error may occur in the converted data.

Accordingly, the amplifier 232 holds the change value of the capacitance for a predetermined time while the analog-to-digital converter 234 is working so as not to cause crosstalk of the data input, and then, when the operation of the analog-to-digital converter 234 is completed, the power failure The capacitance change value is supplied to the analog-to-digital converter 234 through the mux 233 .

The analog-to-digital converter 234 converts the input analog capacitance change value into a digital value to generate touch data. Then, the generated digital form of touch data is supplied to the touch processor 210 .

As described above, the touch processor 210 analyzes the input touch data to detect the presence or absence of the user's touch and the coordinates at which the touch is made. In addition, the touch processor 210 analyzes touch data received from all sensing (Rx) lines of the touch screen to detect whether or not the touch screen 100 is bent and which driving (Tx) lines are arranged in the bending area.

Since the banding area can be continuously varied in the bandable touch screen, the average value or initial value of frames in units of tens to hundreds is stored as reference data in a separately provided memory during initial operation.

This reference data is used to compare with touch data obtained when the bending area of the touch screen is changed. That is, by comparing the newly acquired touch data with the reference data, it can be determined whether the bending area of the touch screen has been changed.

Here, the comparison of the newly acquired touch data with the reference data may be made every frame or may be made in units of a certain frame. When the newly acquired touch data and reference data are compared in every frame, it is possible to most effectively prevent deterioration of touch sensing performance due to banding. In addition, when confirming a change in the bending area of the touch screen, by comparing newly acquired touch data and reference data in units of a predetermined frame, the amount of data calculation can be reduced, thereby reducing the load on the touch processor.

9 to 12 are diagrams illustrating a touch sensing method of a driving apparatus for a touch screen according to an embodiment of the present invention.

Hereinafter, a touch sensing method of a driving device of a touch screen according to an embodiment of the present invention will be described with reference to FIGS. 9 to 12 .

First, referring to FIG. 9 , driving conditions are set for each driving (Tx) line of the touch screen (S10), and a driving signal is supplied to each driving (Tx) line (S20).

Then, the amount of change in capacitance of each sensing (Rx) line is sensed by sequentially sensing all the sensing (Rx) lines (S30).

Next, after accumulating the change amount of the capacitance of each sensing (Rx) line a predetermined number of times, touch data for touch determination is generated ( S40 ).

Then, it is determined whether it is an initial sensing by analyzing the touch data (S50).

As a result of the determination in S50, in the case of initial sensing, the touch data is stored as reference data in a separately provided memory (S60). After S60, the procedure described above is sequentially performed from step S20.

Meanwhile, if it is determined in S50 that the initial sensing is not performed, the reference data stored in the memory is compared with the touch data generated in S40 (S70).

As a result of the comparison in S70, if no change occurs in the data, the touch algorithm is performed based on the input touch data that there is no bending area on the touch screen or that the previously generated bending area is maintained as it is (S100) .

On the other hand, as a result of the comparison in S70, when there is a change in data, it means that there is no bending area on the touch screen, but a new bending area is created, or a bending area other than the previously generated bending area is generated. The driving conditions are changed for each driving (Tx) line (S90). At this time, the change in driving conditions for each driving (Tx) line is applied from the next frame.

As shown in FIGS. 10 and 11 , since the bending axis and the driving (Tx) lines 112 and 114 are formed horizontally in parallel, when bending occurs, the axis of the driving (Tx) line A change occurs in the touch data of the corresponding nodes. It can be seen that banding has occurred in the touch screen through a change in touch data values of nodes formed on the axis of the driving (Tx) line.

Here, even if the same driving signal is supplied to the first driving (Tx) lines 112 disposed in the flat area and the second driving (Tx) lines 114 disposed in the bending area, the sensing (Rx) line by bending Touch data sensed in the . The first driving (Tx) lines 112 disposed in the flat area and the second driving (Tx) lines 114 disposed in the bending area may be detected using the change in capacitance due to bending. have.

As shown in FIG. 12 , after arranging the touch data of all nodes in the same matrix form as in the arrangement composition of the driving (Tx) lines and the sensing (Rx) lines, the touch data of each node is analyzed to form a banding area. position can be sensed. Also, the first driving (Tx) lines disposed in the flat area and the second driving (Tx) lines disposed in the bending area may be detected.

After the driving conditions are changed for each driving (Tx) line in S90, a driving signal supplied to the driving (Tx) line in the flat region and the driving signal supplied to the driving (Tx) line in the bending region are separately generated in the S20 procedure. The driving signal supplied to the driving (Tx) line is supplied.

In the S20 procedure, the touch processor 210 generates a first parameter (voltage, frequency, gain voltage, accumulated count value) for generating a driving signal supplied to the first driving (Tx) lines disposed in the flat region and the bending region. Differently generated second parameters (voltage, frequency, gain voltage, and accumulated number of times) for generating a driving signal supplied to the second driving (Tx) lines disposed in the bending region are differently generated and supplied to the touch driving unit 220 . do.

In addition, the touch driver 220 generates a first driving signal P1 based on the first parameter, and supplies the first driving signal P1 to first driving (Tx) lines disposed in a flat area. Also, the touch driver 220 generates the second driving signal P2 based on the second parameter and supplies the second driving signal P2 to the second driving (Tx) lines disposed in the bending area.

Thereafter, the procedure described above is sequentially performed from S30. If the procedures S10 to S90 are performed in real time, even if the bending area of the touch screen is continuously created and changed, a touch sensing performance equivalent to that of a generally flat touch screen can be obtained.

In addition, the touch screen driving apparatus according to an embodiment of the present invention can be applied to a band-enabled touch screen to prevent deterioration of touch sensing performance due to bending of the touch screen.

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 screen
200: driving device of the touch screen
210: touch processor
220: touch driving unit
230: touch sensing unit
231: mutual sensing unit
232: amplifier
233: mux
234: analog to digital converter
300: display panel
310: timing controller
320: gate driver
330: data driver

Claims (7)

Driving lines positioned on or within the display panel and bent together with the display panel and extending in a first direction, such as a bending axis, and sensing lines insulated from the driving lines and extending in a second direction a touch screen comprising;
A driving signal is supplied to the driving lines of the touch screen, a first driving signal is supplied to the first driving lines arranged in a flat region, and a second driving signal is supplied to the second driving lines arranged in a bending region. a touch driving unit;
a touch sensing unit generating touch data by sensing a change in capacitance of sensing lines of the touch screen; and
a touch processor configured to supply a first parameter for generating the first driving signal and a second parameter for generating the second driving signal to the touch driving unit and detecting a touch based on the touch data;
The touch processor
driving lines of the touch screen through the touch driving unit, comparing touch data sensed from the sensing lines of the touch screen through the touch sensing unit with reference data, and performing the banding on the touch screen according to the comparison result Detects the occurrence of a region, the position of the second driving lines of the touch screen located in the bending region and extending in the first direction, such as the bending axis, and the position of the second driving lines of the touch screen located in the flat region and extending in the first direction A driving device for a touch screen that detects the positions of the first driving lines of the touch screen. According to claim 1,
The touch processor compares the sensed touch data with the reference data for every frame or a predetermined frame to detect a change in the occurrence and position of the bending region. According to claim 1,
The touch processor
In the initial sensing of the touch screen, driving lines of the touch screen are driven and touch data sensed from the sensing lines of the touch screen through the touch sensing unit is stored as the reference data. According to claim 1,
The touch processor sets the voltage and frequency of the driving signal, the gain voltage of the touch sensing unit, and the accumulated count value to the first and second parameters,
At least one of the voltage, frequency, gain voltage, and accumulated count value of the first parameter is set to be different from at least one of the voltage, frequency, gain voltage, and accumulated count value of the second parameter. 5. The method of claim 4,
The touch driver,
generating the first driving signal based on the voltage, frequency, gain voltage, and accumulated count value of the first parameter;
generating the second driving signal based on the voltage, frequency, gain voltage, and accumulated count value of the second parameter;
The touch sensing unit
Sensing the output of the sensing lines using the gain voltage of the first parameter and the accumulated number of times supplied through the touch driver;
A touch screen driving apparatus for sensing the output of the sensing lines by using the gain voltage of the second parameter and the accumulated number of times supplied through the touch driving unit. 5. The method of claim 4,
The touch processor is configured to increase at least one of a voltage, a frequency, a gain voltage, and an accumulation number of the second parameter than the first parameter. 5. The method of claim 4,
The touch processor is configured to decrease at least one of a voltage, a frequency, a gain voltage, and an accumulation number of the second parameter than the first parameter.

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