KR102651802B1 - Touch display device and operating method of the same - Google Patents

Abstract

A touch display device and method of operating the same are provided. A touch display device includes a touch screen panel including a plurality of touch electrodes, a touch driving circuit that supplies a driving signal to the touch screen panel and receives a sensing signal, and detects a touch input of the touch screen panel based on the sensing signal. It includes a touch controller, wherein the touch driving circuit divides each frame into a touch sensing section and a noise sensing section for consecutive display frames, supplies a first driving signal to the touch screen panel in the touch sensing section, and A second driving signal is supplied in a noise sensing section, and the touch controller provides a touch sensing signal provided from the touch screen panel in the touch sensing section and a touch screen panel provided in a noise sensing section adjacent to the touch sensing section. The touch input is detected by comparing noise sensing signals.

Description

Touch display device and operating method thereof {TOUCH DISPLAY DEVICE AND OPERATING METHOD OF THE SAME}

The present invention relates to a touch display device and a method of operating the same.

As the information society develops, various types of display devices are being developed. Recently, various display devices such as liquid crystal display (LCD), plasma display panel (PDP), and organic light emitting display (OLED) are being used.

Such a display device may include a touch display device implemented to receive a touch-based input method from the user. In such touch display devices, a capacitive touch sensing method that detects a user's input by detecting the touch input based on a change in capacitance formed on the touch electrode is widely used.

Touch display devices need to provide a quick response to a user's touch input for an improved user experience. At the same time, it is required to prevent misrecognition of a touch input in an area not intended by the user, that is, the occurrence of ghost noise.

The technical problem to be solved by the present invention is to provide a touch display device that prevents ghost noise and provides a fast touch response speed.

The technical problem to be solved by the present invention is to provide a method of operating a touch display device that prevents the occurrence of ghost noise and provides a fast touch response speed.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

A touch display device according to an embodiment of the present invention for achieving the above technical problem includes a touch screen panel including a plurality of touch electrodes, a touch driving circuit for supplying a driving signal to the touch screen panel and receiving a sensing signal, A touch controller detecting a touch input of the touch screen panel based on the sensing signal, wherein the touch driving circuit divides each frame into a touch sensing section and a noise sensing section for consecutive display frames to perform the touch sensing section. A first driving signal is supplied to the touch screen panel in a section and a second driving signal is supplied in the noise sensing section, and the touch controller supplies a touch sensing signal provided from the touch screen panel in the touch sensing section and the touch The touch input is detected by comparing the noise sensing signal provided from the touch screen panel in the noise sensing section adjacent to the sensing section.

In one embodiment of the present invention, the touch controller includes an analog-to-digital converter that converts the touch sensing signal and the noise sensing signal into analog-to-digital, and stores the touch sensing data and noise sensing data converted by the analog-to-digital converter. It may include a buffer and a comparator that compares the touch sensing data and the noise sensing data.

In one embodiment of the present invention, the touch controller compares the touch sensing data of the touch sensing section with the noise sensing data of the subsequent noise sensing section and, if the same, calculates touch coordinates from the touch sensing data or the noise sensing data. It may further include a coordinate calculator.

In one embodiment of the present invention, the touch sensing section and the noise sensing section may be included in the same display frame.

In one embodiment of the present invention, the touch sensing section is included in the nth (n is a positive integer of 2 or more) display frame, and the noise sensing section adjacent to the touch sensing section may be included in the n-1th display frame. .

In one embodiment of the present invention, the touch controller may compare touch sensing data of the current frame with noise sensing data of the previous frame and detect a touch input if they are the same.

In one embodiment of the present invention, the frequency of the first driving signal and the frequency of the second driving signal may be different from each other.

In one embodiment of the present invention, when the touch controller detects a noise signal in the noise sensing section, the touch driving circuit sends a third driving signal having a frequency different from the frequency of the second driving signal to the touch screen panel. can be supplied.

A method of operating a touch display device according to an embodiment of the present invention for achieving the above technical problem divides each frame into a touch sensing section and a noise sensing section for each successive display frame and performs a first drive in the touch sensing section. Supplying a signal to the touch screen panel and supplying a second driving signal in the noise sensing section; And detecting the touch input by comparing a touch sensing signal provided from the touch screen panel in the touch sensing section with a noise sensing signal provided from the touch screen panel in a noise sensing section adjacent to the touch sensing section. .

In one embodiment of the present invention, comparing the touch sensing data of the touch sensing section and the noise sensing data of the subsequent noise sensing section and, if identical, calculating touch coordinates from the touch sensing data or the noise sensing data. can do.

In one embodiment of the present invention, the step of detecting the touch input may include comparing the touch sensing data of the current frame with the noise sensing data of the previous frame and detecting the touch input if they are the same.

In one embodiment of the present invention, when a noise signal is detected in the noise sensing section, supplying a third driving signal having a frequency different from the frequency of the second driving signal in the noise sensing section to the touch screen panel. More may be included.

As described above, the touch display device according to embodiments of the present invention has the same display frame within a divided touch section and between a continuous touch sensing section and a noise sensing section. Depending on whether there is an input, a normal touch input can be determined and the touch input can be detected. Through this, it is possible to reduce the occurrence of erroneous touch inputs caused by noise such as ghost touches.

Additionally, because detection of a touch input is completed in a continuous touch sensing section and a noise sensing section, the time required for detection may not exceed the length of one touch section. Therefore, the response speed of the touch display device to touch input can be increased.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

1 is a block diagram of a touch display device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a touch screen panel and a touch screen circuit of a touch display device according to an embodiment of the present invention.
Figure 3 is a diagram illustrating an example of a touch display device implemented according to an embodiment of the present invention.
Figure 4 is a block diagram for explaining a touch circuit according to an embodiment of the present invention.
Figure 5 is a block diagram for explaining a microcontroller included in an embodiment of the present invention.
Figure 6 is a timing diagram for explaining the operation of a touch circuit according to an embodiment of the present invention.
FIGS. 7A and 7B are timing diagrams showing that one touch section is divided into a touch sensing section and a noise sensing section.
Figure 8 is a flowchart for explaining a method of operating a touch display device according to an embodiment of the present invention.
Figure 9 is a timing diagram for explaining an operating method of a touch display device.
Figure 10 is a flowchart for explaining a method of operating a touch display device according to some other embodiments of the present invention.
Figure 11 is a timing diagram for explaining the operation method of the touch display device.

Hereinafter, various embodiments will be described with reference to the drawings. In this specification, when a component (or region, layer, portion, etc.) is referred to as “on,” “connected,” or “coupled to” another component, it means that it is on the other component. This means that they can be directly connected/combined or a third component can be placed between them.

Like reference numerals refer to like elements. Additionally, in the drawings, the thickness, proportions, and dimensions of components are exaggerated for effective explanation of technical content. “And/or” includes all combinations of one or more that the associated configurations may define.

Terms such as first, second, etc. may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of various embodiments. Singular expressions include plural expressions unless the context clearly dictates otherwise.

Terms such as “below,” “on the lower side,” “above,” and “on the upper side” are used to describe the relationship between the components shown in the drawings. The above terms are relative concepts and are explained based on the direction indicated in the drawings.

"include." Or “to have.” Terms such as are intended to designate the presence of features, numbers, steps, operations, components, parts, or a combination thereof described in the specification, but are intended to indicate the presence of one or more other features, numbers, steps, operations, components, parts, or It should be understood that the existence or addition possibility of combinations of these is not excluded in advance.

1 is a block diagram of a touch display device according to an embodiment of the present invention.

Referring to FIG. 1, the touch display device includes a timing controller 20, a data driving circuit 12, a gate driving circuit 14, a display panel (DIS), a touch screen panel (TP), a touch circuit 30, and a micro It may include a controller 40.

The timing controller 20 can control the data driving circuit 12 and the gate driving circuit 14. The timing controller 20 receives digital video data ( RGB) can be provided.

The timing controller 20 may control the gate driving circuit 14 based on gate timing control signals such as a gate start pulse (GSP), gate shift clock (GSC), and gate output enable signal (GOE).

The timing controller 20 may control the data driving circuit 12 based on data timing control signals such as a source sampling clock (SSC) and a source output enable signal (SOE).

The data driving circuit 12 may convert digital video data (RGB) input from the timing controller 20 into an analog data voltage. The data driving circuit 12 may provide a data voltage to the display panel DIS through the data lines D1 to Dm, where m is an integer of 2 or more.

The gate driving circuit 14 may sequentially generate gate pulses that are synchronized with the data voltage. The gate driving circuit 14 may provide a gate pulse to the display panel DIS through the gate lines G1 to Gn, where n is an integer of 2 or more.

The display panel DIS may display an image based on the gate pulse provided from the gate driving circuit 14 and the data voltage provided from the data driving circuit 12.

In one embodiment of the present invention, the display panel (DIS) includes a liquid crystal display (LCD), a plasma display panel (PDP), an organic light emitting display (OLED), etc. It may be included, but the present invention is not limited thereto.

Subpixels of the display panel DIS may be defined by data lines D1 to Dm and gate lines G1 to Gn. One subpixel may include a thin film transistor (TFT) formed at intersections of a data line and a gate line.

For example, if the display panel (DIS) is a liquid crystal display panel, a black matrix, a color filter, etc. may be formed on the upper substrate of the display panel (DIS), and a TFT, a pixel electrode, and a common electrode may be formed on the lower substrate. there is.

Alternatively, when the display panel DIS is an organic light emitting diode display panel, a TFT, a cathode electrode, and an anode electrode may be formed on the lower substrate of the display panel DIS, and an encapsulation layer and a polarizing layer may be formed on the upper substrate.

The touch circuit 30 can sense the presence and location of a touch using the touch screen panel (TP). The touch circuit 30 may include a driving circuit that generates a driving voltage to drive the touch sensor and a sensing circuit that senses the touch sensor and generates data to detect the presence or absence of a touch.

The touch circuit 30 may be formed on an external substrate connected to the display panel DIS. The touch circuit 30 may be connected to the touch screen (TSP) through the sensing lines (L1 to Li).

The microcontroller 40 can control the touch circuit 30. The microcontroller 40 may receive the first touch synchronization signal (ITsync) from the timing controller 20. The microcontroller 40 may generate a second touch synchronization signal (Tsync) that controls the touch circuit 30 based on the first touch synchronization signal (ITsync).

The microcontroller 40 may exchange touch data or other signals with the touch circuit 30 through a defined interface (IF). The microcontroller 40 may provide touch data to a host system (not shown).

FIG. 2 is a diagram illustrating a touch screen panel and a touch screen driving circuit of a touch display device according to an embodiment of the present invention.

Referring to FIG. 2 , a touch display device may include a touch screen panel (TP) on which a plurality of touch electrodes (TE) are disposed and a touch circuit 30 for driving the touch screen panel (TP).

The touch display device may provide a self-capacitance-based touch sensing function that senses a touch input by measuring the capacitance formed at each touch electrode (TE) or its change depending on the presence or absence of touch, touch location, etc.

As shown in FIG. 2, a plurality of touch electrodes (TE) may be disposed on the touch screen panel (TP). The touch screen panel TP may include a plurality of touch electrodes TE and a plurality of touch lines Li electrically connecting the touch circuit 30.

The touch circuit 300 may sense the touch electrode (TE) by providing a touch driving signal to one or more of the plurality of touch electrodes (TE) and receiving a sensing signal from the touch electrode (TE) to which the driving signal has been applied. . Here, the driving signal may include a modulation signal with a variable voltage level (for example, a pulse width modulation signal, etc.).

Meanwhile, the touch display device may operate in a touch sensing method based on mutual capacitance. At this time, the plurality of touch electrodes (TE) are divided into a driving electrode and a sensing electrode, and the touch circuit 30 is a capacitance between the touch electrode (TE) corresponding to the driving electrode and the touch electrode (TE) corresponding to the sensing electrode. Based on the change, the presence or absence of touch and/or touch coordinates can be sensed.

Hereinafter, the touch display device will be described assuming that it operates in a self-capacitance method.

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

Referring to FIG. 3, the touch circuit 300 includes one or more touch driving circuits (TDC) and a touch driving circuit for supplying a touch driving signal to the touch screen panel (TP) and detecting a sensing signal from the touch screen panel (TP). It may include a touch controller (TCR) that determines the presence and/or location of a touch input using the sensing signal detection result of the TDC.

In one embodiment of the present invention, the touch driving circuit (TDC) included in the touch circuit 30 is an integrated integrated circuit (SRIC) integrated with a source driver integrated circuit (SDIC) implementing the data driving circuit 12. It can be integrated and implemented.

During the touch period, one or more touch electrodes (TE) selected as sensing objects among the plurality of touch electrodes (TE) inside the touch circuit 30 receive a touch driving signal from the touch driving circuit (TDC) of the touch circuit 30. Once applied, the sensing signal can be detected by the touch driving circuit (TDC) of the touch circuit 30.

Additionally, during the touch period, the touch circuit 30 may sense noise flowing into the plurality of touch electrodes TE. That is, during the touch period, the touch driving circuit (TDC) provides a noise sensing signal with a different frequency from the touch driving signal to the touch electrode (TE), and detects the sensing signal to sense the noise of the touch electrode (TE). You can.

Meanwhile, when the touch driving circuit (TDC) supplies a touch driving signal to the touch electrode (TE) for touch sensing, other electrodes or signal lines not related to touch sensing may form unnecessary parasitic capacitance with the touch electrode (TE). You can. Touch sensitivity may be greatly reduced due to this parasitic capacitance.

Therefore, in the touch display device according to an embodiment of the present invention, when the touch driving circuit (TDC) supplies a touch driving signal to the touch electrode (TE) for touch sensing, other electrodes or signal lines unrelated to touch sensing It is possible to provide a Load Free Driving (LFD) signal that is the same as or corresponds to the touch driving signal.

In one embodiment, the LFD signal may have the same or similar frequency and phase as the frequency and phase of the touch driving signal. Additionally, the LFD signal may have the same or similar amplitude as the touch driving signal.

For example, during the touch period, the LFD signal may be applied to all data lines (D1 to Dm) or some data lines (D1 to Dm). Alternatively, the LFD signal may be applied to all gate lines (G1 to Gn) or some gate lines (G1 to Gn) during the touch period.

In another embodiment, the touch driving circuit (TDC) simultaneously supplies a touch driving signal (LFD signal) to all touch electrodes (TE) during the touch period, and selects one or more touches to be sensed among all touch electrodes (TE). It is also possible to sequentially sense only the electrodes (TE). Here, when the touch driving signal (LFD signal) is simultaneously supplied to all touch electrodes (TE), the load-free driving signal may also be applied to all data lines (D1 to Dm) and all gate lines (G1 to Gn). In this case, the LFD signal is the same as the touch driving signal for touch sensing, and may also mean the touch driving signal itself applied to the touch electrode (TE) that is the sensing target.

Meanwhile, each of the touch driving circuit (TDC) and source driver integrated circuit (SDIC) may be implemented in a Tape Carrier Package (TCP) method, a Chip On Film (COF) method, or a Chip On Glass (COG) method.

For example, when the integrated integrated circuit (SRIC) is implemented in the COF method as shown in Figure 3, the integrated integrated circuit (SRIC) is mounted on a film, and one end of the film on which the integrated integrated circuit (SRIC) is mounted may be connected to a pad portion on the outside of the display panel (DIS), and the other end may be connected to a printed circuit board (PCB).

The touch controller (TCR) may be mounted on a printed circuit board (PCB). In one embodiment, the touch controller (TCR) and the touch driving circuit (TDC) may be implemented as separate components as shown in FIG. 3, but are not limited thereto. ) may be integrated and implemented as one part.

Figure 4 is a block diagram for explaining a touch circuit according to an embodiment of the present invention.

Referring to FIG. 4, the touch circuit 30 may include a multiplexer 31, a preamplifier 32, an integrator 33, and an analog-to-digital converter 34.

The multiplexer 31 may select one or more sensing target touch electrodes (TE) from among the plurality of touch electrodes (TE) disposed on the touch screen panel (TP). Specifically, the multiplexer 31 sequentially selects one sensing target touch electrode (for example, TE1) among the plurality of touch electrodes (TE1, TE2, TE3, TE4, ??) corresponding to it and generates a preamplifier ( 32).

When a touch driving signal (TDS) is applied to one sensing target touch electrode (TE1), the multiplexer 31 applies an LFD signal to the remaining non-sensing touch electrodes (TE1, TE2, TE3, TE4, ??). It can be. In this case, the touch driving signal (TDS) and the LFD signal may be the same.

The preamplifier 32 may be connected to the touch electrode TE1, which is a sensing target, among the plurality of touch electrodes TE1, TE2, TE3, TE4, TE5, ??, by the multiplexer 31. The preamplifier 32 can receive a sensing signal from the touch electrode TE1, which is a sensing target.

The preamplifier 32 may receive, for example, a touch driving signal (TDS) at another input terminal that has a predetermined amplitude (ΔV) and swings at a voltage level between a high level (VTOP) and a low level (VBOT). there is. The preamplifier 32 may output the voltage difference between the touch electrodes provided from the multiplexer 31.

The integrator 33 may integrate the voltage amplified and output from the preamplifier 32 and provide the integrated voltage to the analog-to-digital converter 34.

Although not shown in FIG. 4, a sampling circuit that samples the output voltage of the preamplifier 32 may be further connected between the preamplifier 32 and the integrator 33.

The analog-to-digital converter 34 may generate touch sensing data Tout by converting the sensing result output from the touch electrode TE1 selected by the multiplexer 31 into a digital value. The analog-to-digital converter 34 may provide the generated touch sensing data (Tout) to the microcontroller 40.

Figure 5 is a block diagram for explaining the microcontroller 40 included in one embodiment of the present invention.

Referring to FIG. 5, the microcontroller 40 may include a buffer 41, a comparator 42, and a coordinate calculator 43.

As shown in FIG. 1, the microcontroller 40 and the touch circuit 30 can exchange touch data or other signals through the interface (IF).

The buffer 41 may temporarily store touch sensing data Tout, which is digital data provided from the touch circuit 30. The buffer 41 includes a memory and can sequentially store sensing data obtained from a plurality of touch electrodes (TE1, TE2, TE3, TE4, TE5, ??).

The buffer 41 may output the temporarily stored touch sensing data Tout to the comparator 42 by a synchronization signal provided from the touch circuit 30.

The comparator 42 may compare the value of the touch sensing data (Tout) provided from the touch circuit 30 and the sensing data provided from the buffer 41. The comparator 42 may compare the values of the sensing data in the touch sensing section and the sensing data in the noise sensing section. The comparator 42 may provide the comparison result to the coordinate calculator 43.

The coordinate calculator 43 calculates the coordinates of the touch input from the touch sensing data Tout provided from the touch circuit 30 according to the comparison result of the comparator 42. That is, if the values of the sensing data in the touch sensing section and the sensing data in the noise sensing section match the results of the comparison by the comparator 42, the coordinate calculator 43 can calculate the touch coordinates from the provided sensing data. The coordinate calculator 43 may provide the calculated touch coordinates to a host system (not shown).

The microcontroller 40 may refer to a CPU in which a microprocessor and an input/output module are made into one chip. The microcontroller 40 may further include functional blocks and input/output units other than the components shown in FIG. 5 .

A detailed description regarding the operation of each component of the microcontroller 40 will be described in more detail later using the drawings of FIG. 8 and below.

Figure 6 is a timing diagram for explaining the operation of a touch circuit according to an embodiment of the present invention.

Referring to FIG. 6, a second touch synchronization signal (Tsync) that distinguishes the display section (Td) and the touch section (Tt) during consecutive display frames (Frame _n-1 , Frame _n , Frame _n+1 ). ) The timing diagram is shown.

As described above, the microcontroller 40 may receive the first touch synchronization signal (ITsync) from the timing controller 20. The microcontroller 40 may generate a second touch synchronization signal (Tsync) that controls the touch circuit 30 based on the first touch synchronization signal (ITsync).

The second touch synchronization signal Tsync may define the touch section Tt by having a high level in the display section Td and a low level in the touch section Tt. In one embodiment, unlike what is shown in FIG. 6, the microcontroller 40 may generate a second touch synchronization signal (Tsync) having a low level in the display period (Td) and a high level in the touch period (Tt). there is.

The data driving circuit 12 and the gate driving circuit 12 display images by applying data signals and gate signals to the data lines (D1 to Dm) and gate lines (G1 to Gn), respectively, in the display period (Td). do. The touch circuit 30 may not sense the touch input of the touch electrode TE during the display period Td by the second touch synchronization signal Tsync.

Meanwhile, the touch circuit 30 may provide a touch driving signal through the touch lines (L1 to Li) in the touch section (Tt). The touch circuit 30 can detect a touch by reading the touch sensing signals of the touch lines (L1 to Li) in the touch section (Tt). Together with the signal, the touch circuit 30 may apply the LFD signal to at least one data line (D1 to Dm) or at least one gate line (G1 to Gn) in the touch period (Tt).

In one embodiment of the present invention, one display frame may be divided into one display section (Td) and one touch section (Tt). Alternatively, one display frame may be defined as alternating two or more display sections and two or more touch sensing sections.

FIGS. 7A and 7B are timing diagrams showing that one touch section (Tt) is divided into a touch sensing section (TSP) and a noise sensing section (NSP).

Referring to FIG. 7A, the touch section (Tt) is the touch sensing section (TSP) in which the touch driving signal (TDS) of the first frequency (f1) is applied to the touch lines (L1 to Li) and the second frequency (f2). The touch driving signal can be divided into a noise sensing section (NSP) applied to the touch lines (L1 to Li). The touch sensing section (TSP) is a section for sensing a touch input on the touch screen panel (TP), and the noise sensing section (NSP) is a section for measuring noise flowing into the touch electrode (TE).

In one embodiment of the present invention, the first frequency f1 and the second frequency may be 94 kHz and 130 kHz, respectively, but the present invention is not limited thereto.

That is, the touch display device according to an embodiment of the present invention divides the touch section (Tt) into a touch sensing section (TSP) and a noise sensing section ( NSP) can be divided into touch sensing and noise sensing.

The touch circuit 30 can measure noise flowing into the touch electrode (TE) through a finger or a conductor during the noise sensing period (NSP) and change the frequency (f2) of the touch driving signal according to the noise level. For example, the touch controller (TCR) determines that the value of the noise data sensed during the current noise sensing section (e.g., NSP of Frame _n ) is the noise data sensed in the previous noise sensing section (e.g., NSP of Frame _n-1 ). If it is greater than the value of , the frequency (f2) of the touch driving signal can be changed to another frequency.

The touch section (Tt) can be divided into a touch sensing section (TSP) followed by a noise sensing section (NSP), as shown in FIG. 7A. However, the present invention is not limited to this, and the touch section (Tt) may be divided into a noise sensing section (NSP) followed by a touch sensing section (TSP), as shown in FIG. 7B.

FIG. 8 is a flowchart for explaining a method of operating a touch display device according to an embodiment of the present invention, and FIG. 9 is a timing diagram for explaining a method of operating a touch display device.

Referring to FIGS. 8 and 9 , a method of operating a touch display device includes detecting a touch input in a touch sensing section (S110).

As shown in FIG. 9 , a case in which the sensing signal SS1 is generated by a touch input to the touch screen panel TP during the touch sensing section TSP included in the touch section Tt will be described.

The touch driving circuit (TDC) may select one or more touch electrodes as a sensing target among the plurality of touch electrodes (TE) and provide a touch driving signal (TDS). The touch driving circuit (TDC) can detect a touch by receiving a touch sensing signal from the selected touch electrode (TE).

The touch sensing signal provided to the touch circuit 30 may be processed through the preamplifier 32 and the integrator 33 and then converted into touch sensing data by the analog-to-digital converter 34.

The touch controller (TCR) may determine whether the touch sensing signal provided to the touch circuit 30 corresponds to a valid touch input (S120). The touch controller (TCR) can determine whether the touch sensing signal corresponds to a valid touch input by determining whether the size of the touch sensing signal is greater than or equal to a predetermined threshold.

If it is determined to be a valid touch input by the touch controller (TCR), the touch sensing data may be temporarily stored in the buffer 41 within the microcontroller 40. The touch sensing data stored in the buffer 41 can be used for comparison with noise sensing data sensed in the noise sensing section (NSP).

Next, the presence or absence of a touch input is detected in the noise sensing section (NSP) following the touch sensing section (TSP) (S130). As shown in FIG. 9, it is assumed that the sensing signal SS2 due to a touch input is generated in the noise sensing section (NSP).

As described above, in order to minimize ghost touches, touch sensing and noise sensing can be performed by dividing the touch section (Tt) into a touch sensing section (TSP) and a noise sensing section (NSP). Specifically, when the same touch input is detected in the touch sensing section (TSP) and the noise sensing section (NSP) (S140), the touch controller (TCR) determines that a valid touch input has been provided and uses this to calculate touch coordinates. .

Comparison of the touch sensing signal of the touch sensing section (TSP) and the noise sensing signal of the noise sensing section (NSP) may be performed by the microcontroller 40.

Specifically, the buffer 41 stores touch sensing data (Tout) of the touch sensing section (TSP). Next, when noise sensing data is provided in the noise sensing section (TSP), the stored touch sensing data in the touch sensing section (TSP) is loaded and provided to the comparator 42. The comparator 42 that receives the touch sensing data and noise sensing data for the same touch electrode (TE1) can compare the two data.

When the comparator 42 determines that the two data match, the coordinate calculator 43 may calculate the coordinates of the touch input based on the touch sensing data (Tout). The host system can detect the touch input by receiving the calculated coordinates of the touch input (S150).

If the comparator 42 determines that the two data do not match, the touch controller (TCR) may determine this to be an invalid touch input or noise such as a ghost touch. At this time, the microcontroller 40 may not calculate coordinates for the touch sensing data.

When the touch controller (TCR) determines that the noise sensing signal (SS2) input in the noise sensing section (NSP) is noise, the touch driving circuit (TDC) is different from the second frequency (f2) for the touch screen panel (TP). A touch driving signal (TDS) of a third frequency (f3) may be provided. This can improve the signal to noise ratio (SNR) of the touch circuit 30.

As described above, the touch display device according to an embodiment of the present invention determines whether there is the same input between the continuous touch sensing section (TSP) and the noise sensing section (NSP) within the touch section (Tt) in which one display frame is divided. Depending on whether the touch input is normal, the touch input can be determined and the touch input can be detected. Through this, it is possible to reduce the occurrence of erroneous touch inputs caused by noise such as ghost touches.

Additionally, since detection of the touch input is completed in the continuous touch sensing section (TSP) and noise sensing section (NSP), the time required for detection may not exceed the length of one touch section (Tt). Therefore, the response speed of the touch display device to touch input can be increased.

FIG. 10 is a flowchart for explaining a method of operating a touch display device according to some other embodiments of the present invention, and FIG. 11 is a timing diagram for explaining a method of operating a touch display device.

As shown in FIG. 11, the sensing signal (SS1) is generated during the noise sensing section (NSP1) included in the touch section (Tt1) of the previous display frame (Frame n-1), and the consecutive display frame (Frame n) A case in which the sensing signal SS2 occurs during the touch sensing section TSP2 included in the touch section Tt2 will be described.

Referring to FIG. 10, a method of operating a touch display device includes detecting a touch input in the noise sensing section NSP1 (S210).

In the touch section (Tt2) of the previous display frame (Frame n-1), the noise sensing section (NSP1) may proceed. The touch driving circuit (TDC) may select one or more touch electrodes as a sensing target among the plurality of touch electrodes (TE) and provide a touch driving signal (TDS). The touch driving signal (TDS) provided in the noise sensing section (NSP1) may have a second frequency (f2) different from the first frequency (f1) of the touch driving signal (TDS) provided in the touch sensing section (TSP1). there is.

The touch driving circuit (TDC) can detect a touch by receiving the noise sensing signal (SS1) from the selected touch electrode (TE).

The noise sensing signal SS1 provided to the touch circuit 30 may be processed through the preamplifier 32 and the integrator 33 and then converted into noise sensing data by the analog-to-digital converter 34.

The touch controller (TCR) may determine whether the noise sensing signal provided to the touch circuit 30 corresponds to a valid touch input (S220). The touch controller (TCR) can determine whether the noise sensing data corresponds to a valid touch input by determining whether the size is greater than or equal to a predetermined threshold.

If it is determined to be a valid touch input by the touch controller (TCR), the corresponding noise sensing data may be compared with the touch sensing data stored in the buffer 41 in the microcontroller 40.

Next, it is detected whether touch sensing data in the preceding touch sensing section (TSP1) is stored in the buffer 41 (S230). That is, if the same touch input is detected in the touch sensing section (TSP1) and the noise sensing section (NSP1) of the previous display frame (Frame n-1) (S240), the touch controller (TCR) determines that a valid touch input has been provided. And calculate the touch coordinates using touch sensing data or noise sensing data.

Comparing the noise sensing data of the noise sensing section (NSP1) and the touch sensing data of the touch sensing section (TSP1) may be performed by the microcontroller 40.

Specifically, the comparator 42 may compare the noise sensing data of the noise sensing section (NSP1) stored in the buffer 41 with the touch sensing data of the touch sensing section (TSP1).

When the comparator 42 determines that the two data match, the coordinate calculator 43 may calculate the coordinates of the touch input based on the touch sensing data or noise sensing data. The host system can detect the touch input by receiving the calculated coordinates of the touch input (S270).

If the comparator 42 determines that the two data do not match, the touch controller (TCR) may determine this to be an invalid touch input or noise such as a ghost touch. At this time, the microcontroller 40 may store the noise sensing data of the previous frame (Frame n-1) again in the buffer 41 without calculating the coordinates for the touch sensing data. This is stored in the buffer 41 for comparison when a touch input is detected in the touch sensing section (TSP2) of the following frame (Frame n).

Next, a touch input is detected in the touch sensing section (TSP2) of the following frame (Frame n) (S250). If the same touch input is detected in the touch sensing section (TSP2) and the previous frame (Frame n-1) noise sensing section (NSP1) (S260), the touch controller (TCR) determines that a valid touch input has been provided and touches the touch sensing data. Alternatively, touch coordinates are calculated using noise sensing data (S270).

A touch display device according to an embodiment of the present invention can detect a touch input using noise sensing data obtained in a noise sensing section of a previous display frame and touch sensing data obtained in a touch sensing section of a successive display frame. Therefore, ghost touches can be prevented by using the noise sensing section, and quick touch input detection can be performed.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. The scope of the present invention is indicated by the scope of the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. must be interpreted.

DIS: Display panel 12: Data drive circuit
14: Gate driving circuit 20: Timing controller
30: touch circuit 40: microcontroller

Claims (15)

A touch screen panel including a plurality of touch electrodes;
a touch driving circuit that supplies a driving signal to the touch screen panel and receives a sensing signal;
A touch controller detecting a touch input of the touch screen panel based on the sensing signal,
The touch driving circuit is,
For each continuous display frame, each frame is divided into a touch sensing section and a noise sensing section, and a first driving signal is supplied to the touch screen panel in the touch sensing section and a second driving signal is supplied in the noise sensing section,
The touch controller is,
Detecting the touch input by comparing a touch sensing signal provided from the touch screen panel in the touch sensing section with a noise sensing signal provided from the touch screen panel in a noise sensing section adjacent to the touch sensing section,
The touch controller is,
It further includes a coordinate calculator that compares the touch sensing data of the touch sensing section and the noise sensing data of the subsequent noise sensing section and, if they are equal, calculates touch coordinates from the touch sensing data or the noise sensing data,
In the touch section of the previous display frame, the noise sensing section progresses, and the touch sensing data of the touch sensing section of the previous display frame is compared with the noise sensing data of the noise sensing section,
When the touch sensing data of the touch sensing section of the previous display frame and the noise sensing data of the noise sensing section do not match, and the same touch input is detected in the touch sensing section of the subsequent display frame and the noise sensing section of the previous display frame , A touch display device where the touch controller calculates touch coordinates. According to clause 1,
The touch controller is,
An analog-to-digital converter that converts the touch sensing signal and the noise sensing signal into analog-digital,
A buffer for storing touch sensing data and noise sensing data converted by the analog-to-digital converter, and
Including a comparator that compares the touch sensing data and the noise sensing data,
Touch display device. delete According to clause 1,
The touch sensing section and the noise sensing section are included in the same display frame,
Touch display device. According to clause 2,
The touch sensing section is included in the nth display frame (n is a positive integer of 2 or more),
The noise sensing section adjacent to the touch sensing section is included in the n-1 display frame,
Touch display device. According to clause 2,
The touch controller is,
Compares the touch sensing data of the current frame and the noise sensing data of the previous frame to detect touch input if they are the same.
Touch display device. According to paragraph 1,
The frequency of the first driving signal and the frequency of the second driving signal are different from each other,
Touch display device. According to clause 1,
When the touch controller detects a noise signal in the noise sensing section,
The touch driving circuit supplies a third driving signal having a frequency different from the frequency of the second driving signal to the touch screen panel,
Touch display device. For consecutive display frames by a touch circuit, each frame is divided into a touch sensing section and a noise sensing section, and a first driving signal is supplied to the touch screen panel in the touch sensing section and a second driving signal is supplied in the noise sensing section. steps; and
Detecting a touch input by comparing a touch sensing signal provided from the touch screen panel in the touch sensing section and a noise sensing signal provided from the touch screen panel in a noise sensing section adjacent to the touch sensing section by a microcontroller. Contains,
Comparing the touch sensing data of the touch sensing section and the noise sensing data of the subsequent noise sensing section, and if they are the same, calculating touch coordinates from the touch sensing data or the noise sensing data,
In the touch section of the previous display frame, the noise sensing section progresses, and the touch sensing data of the touch sensing section of the previous display frame is compared with the noise sensing data of the noise sensing section,
When the touch sensing data of the touch sensing section of the previous display frame and the noise sensing data of the noise sensing section do not match, and the same touch input is detected in the touch sensing section of the subsequent display frame and the noise sensing section of the previous display frame , the microcontroller calculates the touch coordinates
How to operate a touch display device. delete According to clause 9,
The noise sensing section adjacent to the touch sensing section is included in the same display frame,
How to operate a touch display device. According to clause 9,
The touch sensing section is included in the nth display frame (n is a positive integer of 2 or more),
The noise sensing section adjacent to the touch sensing section is included in the n-1 display frame,
How to operate a touch display device. According to clause 12,
The step of detecting the touch input is,
Comprising the touch sensing data of the current frame and the noise sensing data of the previous frame, and detecting the touch input if they are the same.
How to operate a touch display device. According to clause 9,
The frequency of the first driving signal and the frequency of the second driving signal are different from each other,
How to operate a touch display device. According to clause 9,
When a noise signal is detected in the noise sensing section,
Further comprising supplying a third driving signal having a frequency different from the frequency of the second driving signal to the touch screen panel in the noise sensing section,
How to operate a touch display device.