KR102020282B1 - Display device with integrated touch screen and method for driving the same - Google Patents

Abstract

The present invention, a panel comprising a plurality of electrodes; A data driver converting RGB data input from the timing controller into data voltages and supplying the data voltages to data lines; A gate driver sequentially supplying a gate signal to the gate lines to apply the data voltage to the pixels of the panel in a first high logic section and a second high logic section of a horizontal synchronization signal; And a touch IC for applying a touch scan signal to the plurality of electrodes in a low logic section between a first high logic section and a second high logic section of the horizontal synchronization signal. It is characterized by including.

Description

Touch screen integrated display device and driving method {DISPLAY DEVICE WITH INTEGRATED TOUCH SCREEN AND METHOD FOR DRIVING THE SAME}

The present invention relates to a display device, and more particularly, to a touch screen integrated display device and a driving method thereof.

Touch screens include Liquid Crystal Display, Field Emission Display (FED), Plasma Display Panel (PDP), Electroluminescence Device (EL), Electrophoretic Display It is a type of input device installed in an image display device such as an input device for inputting predetermined information by pressing (touching or touching) a touch sensor in a touch screen while the user views the image display device.

In particular, in recent years, the demand for an in-cell type touch screen integrated display device incorporating elements constituting the touch screen inside the display device for the slimming of portable terminals such as smartphones and tablet PCs has increased. have.

In general, an in-cell type touch screen display device transmits touch data to the system once per vertical synchronization signal (Vsync) that defines one frame period. In this case, a frequency at which new data is transmitted to all pixels in the panel is called a display frame rate. In a typical in-cell type touch screen display device, one frequency is generated every one vertical sync signal (Vsync) that defines one frame period. The touch data is transmitted to the system one by one.

Hereinafter, driving of a general in-cell type touch screen integrated display device will be described with reference to FIG. 1.

1 is a timing diagram of signals of a display period and a touch period according to one vertical synchronization signal of a general touch screen integrated display device.

In general, an in-cell type self-capacitance type touch screen integrated display device, as shown in FIG. 1, the data period of the display period (D) and the touch period (T) within one frame according to one vertical synchronization signal (Data) Drive is divided by time according to Enable) signal.

An object of the present invention is to provide a touch screen integrated display device capable of driving display driving and touch driving according to a horizontal synchronization signal.

A touch screen integrated display device according to an embodiment of the present invention, comprising: a panel including a plurality of electrodes; A data driver converting RGB data input from the timing controller into data voltages and supplying the data voltages to data lines; A gate driver sequentially supplying a gate signal to the gate lines to apply the data voltage to the pixels of the panel in a first high logic section and a second high logic section of a horizontal synchronization signal; And a touch IC for applying a touch scan signal to the plurality of electrodes in a low logic section between a first high logic section and a second high logic section of the horizontal synchronization signal. It is characterized by including.

In a method of driving a touch screen integrated display device according to an embodiment of the present invention, the method of driving a touch screen integrated display device including a panel including a plurality of electrodes, a touch IC, and a gate driver, wherein the gate driver includes: Applying the data voltage to a pixel of the panel in a first high logic section and a second high logic section of a horizontal synchronization signal; And applying a touch scan signal to the plurality of electrodes in a low logic section between a first high logic section and a second high logic section of a horizontal synchronization signal by the touch IC. Characterized in that it comprises a step.

According to various embodiments of the present disclosure, the display driving and the touch driving of the in-cell type self-capacitance type touch screen are not divided into one frame unit according to one vertical synchronization signal but divided into one line unit according to one horizontal synchronization signal. Can be operated.

Further, according to various embodiments of the present invention, since the display driving and the touch driving time for driving by one horizontal synchronizing signal unit are divided, the memory size can be reduced to reduce the cost.

In addition, according to various embodiments of the present disclosure, the touch report rate may be increased to accurately recognize a touch input or dragging.

1 is a timing diagram of a signal representing a display driving method and a touch driving method according to one vertical synchronizing signal of a general touch screen integrated display device;
2 is a diagram illustrating a configuration of a touch screen integrated display device according to an embodiment of the present invention;
3 illustrates a panel and a touch IC of a touch screen integrated display device according to an exemplary embodiment of the present invention; And
4 and 5 are timing diagrams of signals showing a display driving method and a touch driving method according to one horizontal synchronizing signal of a touch screen integrated display device according to an exemplary embodiment of the present invention.

The touch screen integrated display device according to an exemplary embodiment divides the electrodes into n groups and sequentially applies a touch scan signal to the divided n groups, but for convenience of description, the electrodes are divided into two groups. Let's take a look at how to do it. Thus, the present invention is not limited to dividing the electrodes into two groups, but may divide the electrodes into two or more groups.

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

2 is a diagram illustrating a configuration of a touch screen integrated display device according to an embodiment of the present invention, and FIG. 3 is a view illustrating a panel and a touch IC of a touch screen integrated display device according to an embodiment of the present invention.

In the touch screen integrated display device according to the exemplary embodiment, as shown in FIGS. 2 to 3, the panel 100, the touch IC 200, the switching unit 210, the gate driver 300, and the data driver 400, a timing controller 500, and a system unit 600.

The panel 100 has a built-in touch screen (not shown), and the touch screen performs a function of sensing a user's touch position. In particular, the touch screen applied to the present invention is an in-cell type to which a self capacitance method is applied. It's a touch screen.

The panel 100 may be configured such that a liquid crystal layer is formed between two substrates. In this case, the lower substrate of the panel 100 includes a plurality of gate lines, a plurality of data lines intersecting the gate lines, a plurality of TFTs (Thin Film Transistors) and data lines formed at intersections of the data line and the gate line. The pixels are arranged in a matrix due to the cross structure of the gate lines.

In addition, as shown in FIG. 3, the panel 100 includes a plurality of electrodes 120 and a plurality of wires 130, and the plurality of electrodes 120 are arranged in the first group (eg, in the panel 100). 111), the second group 112 is divided into a total of two groups (110). The two groups 111 and 112 may be groups in a block form divided in the gate line direction.

First, when a common voltage is applied to drive the display of the panel 100, the plurality of electrodes 120 operate as a common electrode driving a liquid crystal together with pixel electrodes formed in each pixel, and touch scan signals for touch sensing. When is applied to act as a touch electrode for detecting the touch position.

Next, the plurality of wirings 130 connect the plurality of electrodes 120 and the touch IC 200. For example, the touch scan signal applied from the touch IC 200 may be transferred to the plurality of electrodes 120 of the panel 100, and the capacitance received from the plurality of electrodes 120 of the panel 100 may be changed. It serves to convey the change to the touch IC 200.

Next, the touch IC 200 performs a touch scan with the plurality of electrodes in a low logic section between a first high logic section and a second high logic section of a horizontal synchronization signal. Apply a signal.

For example, all electrodes of the panel in the low logic period until the data voltage is applied to the pixel during the first high logic period of the horizontal synchronization signal of the n-th frame and before the data voltage is applied to the pixel during the second high logic period. The touch scan signal. In addition, after the data voltage is applied to the pixel during the second high logic period of the horizontal synchronization signal of the n-th frame, the data voltage is applied to the pixel during the first high logic period of the horizontal synchronization signal of the (n + 1) th frame. The touch scan signal may be applied to all the electrodes of the panel in the low logic period until the low logic period.

Here, the high logic section of the horizontal sync signal is a section including the high logics of the plurality of horizontal sync signals, and the low logic section of the horizontal sync signal is a section including the low logics of the plurality of horizontal sync signals. This is a section indicating a time period during which a touch scan signal can be applied to the electrode.

The first high logic section of the touch screen integrated display device according to an exemplary embodiment of the present invention is a section in which a gate signal is applied to odd-numbered gate lines, and the second high logic section is a gate signal of even-numbered gate lines. May be an interval to be applied. In addition, the first high logic period is a period in which the gate signal is applied from the first gate line to the (n / 2) th gate line, and the second high logic period is from the (n / 2 + 1) th gate line. It may also be a section in which a gate signal is applied to the nth gate line.

The touch IC 200 according to an exemplary embodiment of the present invention may include a touch scan signal generator that generates a touch scan signal to be supplied to a plurality of electrodes of the panel 100 for touch sensing. The touch scan signal may be a touch driving voltage, and the touch driving voltage may have a value greater than a common voltage applied to the plurality of electrodes of the panel 100 to drive the display. In this case, the touch driving voltage may have a voltage corresponding to the common voltage as a low level voltage and a larger voltage as a high level voltage.

In addition, the touch IC 200 may include a touch sensing unit configured to receive a touch sensing signal from the plurality of electrodes 120 and calculate touch coordinates to detect a touch by a user. Here, the calculated touch coordinates are transmitted to the system unit 600 so that the panel 100 can recognize the touch coordinates of the user.

As such, the display driving and the touch driving are not divided and driven according to a data enable signal within one frame according to one vertical synchronization signal, but are driven by being divided in time according to one horizontal synchronization signal, and one frame is driven. Since the touch scan signal is applied to all electrodes twice during the process, the touch data for calculating the touch coordinates can be transmitted twice to the system unit, thereby increasing the touch report rate compared to the general touch screen.

In other words, the touch screen integrated display device according to an embodiment of the present invention increases the frequency at which the touch scan signal is applied to all the electrodes in the panel 100 in one frame, compared to a general touch screen integrated display device. The touch report rate of the touch sensing signal during one frame may be larger than the display frame rate during the one frame, and the touch report rate may be increased to more precise touch input. Or it may be possible to detect the dragging (dragging).

Next, as illustrated in FIG. 3, the switching unit 210 switches the touch scan signal output from the touch IC 200 to be applied to any one of the two groups 111 and 112.

For example, a touch scan signal generated by the touch IC 200 to a plurality of electrodes of the panel 100 may be transferred to any one of the first group 111 or the second group 112 of the panel 100. It functions to switch to be applied to the included electrode.

In other words, the switching unit 210 may include a first group of the panel 100 during a low logic period between the first high logic period and the second high logic period of the horizontal synchronization signal. The touch scan signal is sequentially switched to the electrodes in the 111 and second groups 112.

Here, each of the switching unit 210 is characterized in that connected to one electrode for each group, in particular, each switching unit 210 according to an embodiment of the present invention may be a 2: 1 multiplexer.

In addition, the switching unit 210 is included in the touch IC 200, and the touch scan signal output from the touch IC 200 may be configured to include a first high logic section and a second high logic section of the horizontal synchronization signal. The switch may be sequentially applied to two groups during the Low Logic section between the sections.

Referring again to FIG. 2, the gate driver 300 applies a data voltage to pixels of a panel in a plurality of high logic sections of the horizontal synchronization signal.

In other words, the gate driver 300 sequentially supplies the gate signals to the gate lines GL1 to GLm, and supplies the gate signals to the first high logic period and the second high logic period of the horizontal synchronization signal. The data voltage is applied to the pixels of the panel 100.

For example, the gate driver 300 sequentially supplies a gate signal to the gate lines GL1 to GLm to select a line of the panel 100 to which a data voltage is input, and the pixels of the panel 100 are gated. In response to the signal, the data voltage input from the data driver 400 is charged in the first high logic section and the second high logic section of the horizontal synchronization signal Hsycn.

Meanwhile, the gate driver 300 applied to the present invention may be formed independently of the panel, and may be configured to be electrically connected to the panel in various ways. However, the gate in panel mounted in the panel may be a gate in panel. ; GIP) may be configured. In this case, the gate control signal for controlling the gate driver 300 may be a start signal VST and a gate clock GCLK.

The data driver 400 converts RGB data input from the timing controller 500 into data voltages and outputs the converted data voltages. The data voltage output from the data driver 400 is supplied to the data lines DL1 to DLn.

In other words, the source start pulse (SSP) from the timing controller 500 is shifted according to the source shift clock (SSC) to generate a sampling signal. The data driver 400 latches the pixel data RGB (image data) input according to the source shift clock SSC according to the sampling signal, converts the pixel data into a data signal, and then source outputs the enable signal. A data signal is supplied to the data lines in units of horizontal lines in response to the SOE) signal. The data signal includes a data voltage.

To this end, the data driver 400 may include a data sampling unit, a latch unit, a digital analog converter, an output buffer, and the like.

The timing controller 500 inputs timing signals such as a vertical sync signal Vsync, a horizontal sync signal Hsync, a data enable signal DE, and a main clock CLK input from the system unit 600. In response thereto, control signals GCS and DCS for controlling the operation timing of the gate driver 300 and the data driver 400 are generated. In addition, the timing controller 500 rearranges the RGB data input from the system unit 600 and outputs the rearranged RGB data to the data driver 400.

For reference, the vertical sync signal Vsync is a signal defining one frame period. Therefore, one period of the vertical synchronization signal is set to one frame period. In addition, the horizontal synchronization signal Hsync is a signal that defines one horizontal period required for writing data to one line of pixels in the pixel array of the panel 100. Therefore, one period of the horizontal synchronization signal is set to one horizontal period, and one horizontal period can be calculated by dividing one frame period by the number of lines in the panel. The data enable signal DE is a signal defining a period in which valid data is input and one period is set to one horizontal period such as a horizontal synchronization signal. The main clock CLK is synchronized with the bits of the RGB data.

The system unit 600 transmits timing signals Vsync, Hsync, DE, and MCLK together with the RGB data to the timing controller 500. Here, one line of RGB data is transmitted to the timing controller 500 in synchronization with the high logic section of the horizontal synchronization signal, and is not transmitted to the timing controller 500 in the low logic section of the horizontal synchronization signal. Vsync is a vertical sync signal and Hsync is a horizontal sync signal.

In addition, the system unit 600 executes a program associated with the touch coordinate value so that the panel 100 recognizes the touch coordinate transmitted from the touch IC 200.

On the other hand, the driving method of the touch screen integrated display device according to an embodiment of the present invention is to drive an electrode for touch sensing, and is characterized in that a touch scan signal for touch sensing is applied according to a horizontal synchronization signal. This will be described in detail with reference to FIGS. 2 to 5.

4 and 5 are timing diagrams of signals representing a display driving method and a touch driving method according to one horizontal synchronization signal of a touch screen integrated display device according to an exemplary embodiment of the present invention.

In the method of driving a touch screen integrated display device according to an exemplary embodiment of the present invention, the vertical synchronization signal Vsync defining one frame period is driven in the display mode and the touch mode according to the touch enable signal.

First, the gate driver 300 applies a data voltage to a pixel of a panel in a first high logic section and a second high logic section of a horizontal synchronization signal.

In other words, the gate driver 300 sequentially supplies a gate signal to the gate lines GL1 to GLm to select a line of the panel 100 to which a data voltage is input, and the pixels of the panel 100 are gate signals. In response, the data voltage input from the data driver 400 is charged in the first high logic section and the second high logic section of the horizontal synchronization signal Hsycn.

For example, as shown in FIG. 4, odd-numbered gate lines are driven during a first display driving period in one frame, and even-numbered gate lines are driven during a second display driving period. That is, the above-described first high logic section is a section in which a gate signal is applied to odd-numbered gate lines, and the second high logic section is a section in which the gate signal is applied to even-numbered gate lines.

Alternatively, as shown in FIG. 5, the (n / 2) th gate lines are driven from the first gate line during the first display driving period in one frame and the (n / 2 + 1) second driving period during the second display driving period. ) Th to nth gate lines. That is, the above-described first high logic period is a period in which the gate signal is applied from the first gate line to the (n / 2) th gate line, and the second high logic period is the (n / 2 + 1) th gate line. To the nth gate line.

Next, the touch IC 200 applies a touch scan signal to a plurality of electrodes in a low logic section between a first high logic section and a second high logic section of the horizontal synchronization signal. Apply.

For example, as shown in FIGS. 4 and 5, after the data voltage is applied to the pixel during the first high logic period of the horizontal synchronization signal of the n-th frame, the data voltage is applied to the pixel during the second high logic period. The touch scan signal is applied to all electrodes of the panel in the previous low logic period. In addition, after the data voltage is applied to the pixel during the second high logic period of the horizontal synchronization signal of the n-th frame, the data voltage is applied to the pixel during the first high logic period of the horizontal synchronization signal of the (n + 1) th frame. The touch scan signal may be applied to all the electrodes of the panel in the previous low logic period. That is, the touch IC of the touch screen integrated display device according to an exemplary embodiment may apply the touch scan signal twice to all the electrodes of the panel for one frame.

Next, the touch IC 200 receives a touch sensing signal from the plurality of electrodes 120 of the panel 100 to calculate touch coordinates.

For example, as illustrated in FIGS. 4 and 5, the touch IC 200 receives a touch sensing signal from a plurality of electrodes 120 and calculates touch coordinates through a data processing process to perform touch by a user. Detect. Here, the calculated touch coordinates are transmitted to the system unit 600 so that the panel 100 can recognize the touch coordinates of the user.

The touch IC of the touch screen integrated display device according to an embodiment of the present invention applies a touch scan signal twice to all the electrodes 120 of the panel 100 within one frame, compared to a general touch screen integrated display device. Since the frequency of application is twice as high as before, the touch report rate of the touch sensing signal for one frame may be larger than the display frame rate for one frame, and thus more accurate. Detection of touch input or dragging may be enabled.

For reference, in a typical in-cell type touch screen display device, a frequency at which new data is transmitted to all pixels in a panel is called a display frame rate, and a frequency for transmitting touch data obtained in a touch screen to a system unit is touched. It is called a touch report rate. That is, as the touch report rate is larger than the display frame rate, the speed at which the coordinates input to the touch panel are transmitted is increased, thereby increasing the touch sensitivity felt by the user and expressing the touch input in detail.

Those skilled in the art to which the present invention pertains will understand that the above-described present invention can be implemented in other specific forms without changing the technical spirit or essential features.

Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100: panel 110: group
120 electrode 130 wiring
200: touch IC 210: switching unit
300: gate driver 400: data driver
500: timing controller 600: system

Claims (15)

A panel including a plurality of electrodes;
A data driver converting RGB data input from the timing controller into data voltages and supplying the data voltages to data lines;
A gate driver sequentially supplying a gate signal to the gate lines to apply the data voltage to the pixels of the panel in a first high logic section and a second high logic section of a horizontal synchronization signal; And
And a touch IC configured to apply a touch scan signal to the plurality of electrodes in a low logic section between a first high logic section and a second high logic section of the horizontal synchronization signal. and,
The touch IC receives a touch sensing signal from the plurality of electrodes, calculates touch coordinates,
The touch scan signal is applied twice to all the electrodes of the panel for one frame,
The first high logic section is a section in which the gate signal is applied to odd-numbered gate lines, and the second high logic section is a section in which the gate signal is applied to even-numbered gate lines. Display. delete The method of claim 1,
The first high logic period is a period in which the gate signal is applied from a first gate line to a (n / 2) (n is an integer greater than or equal to two) gate lines, and the second high logic period is (n / 2 + 1) A touch screen integrated display device, wherein the gate signal is applied from an nth gate line to an nth gate line. delete The method of claim 1,
And a touch report rate of the touch sensing signal during one frame is greater than a display frame rate for the one frame. The method of claim 1,
And the panel includes the plurality of electrodes divided into n groups (n is an integer of 2 or more). The method of claim 6,
And the n groups are groups divided in the gate line direction. The method of claim 7, wherein
And a plurality of switching units for switching the touch scan signals output from the touch IC to be applied to any one of the n groups. The method of claim 8,
And each of the plurality of switching units is connected to one electrode of each of the groups. The method of claim 8,
And each of the plurality of switching units is an n: 1 multiplexer. A driving method of a touch screen integrated display device including a panel including a plurality of electrodes, a touch IC, and a gate driver,
Applying, by the gate driver, a data voltage to a pixel of the panel in a high logic period of a first group and a high logic period of a second group of a horizontal synchronization signal;
The touch IC applies a touch scan signal to the plurality of electrodes in a low logic section between a high logic section of a first group and a high logic section of a second group of a horizontal synchronization signal. Applying a; And
The touch IC receiving a touch sensing signal from the plurality of electrodes to calculate touch coordinates,
The touch scan signal is applied twice to all the electrodes of the panel for one frame,
The high logic section of the first group is a section in which a gate signal is applied to odd-numbered gate lines, and the high logic section of the second group is a section in which a gate signal is applied to even-numbered gate lines. A method of driving an integrated screen display device. delete The method of claim 11,
The high logic section of the first group is a section in which a gate signal is applied from a first gate line to a (n / 2) (n is an integer of 2 or more) gate line. A driving method of a touch screen integrated display device, wherein the gate signal is applied from the (n / 2 + 1) th gate line to the n th gate line. delete The method of claim 11,
And a touch report rate of the touch sensing signal for one frame is greater than a display frame rate for the one frame.

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