KR20220093836A - Display device - Google Patents

Abstract

A display device according to various examples of the present specification may comprise: a display panel comprising a pixel connected to a data line and a reference line, a touch driving line crossing the reference line, and a touch sensor between the reference line and the touch driving line; a data driving circuit electrically connected to the data line and the reference line; and a touch driving circuit electrically connected to the touch driving line. Therefore, the present invention is capable of improving productivity.

Description

display device {DISPLAY DEVICE}

This specification relates to a display device.

A user interface (UI) enables communication between a person (user) and various electrical and electronic devices, so that the user can easily control the device as he or she wants. Representative examples of the user interface include a keypad, a keyboard, a mouse, an on-screen display (OSD), and a remote controller having an infrared communication function or a radio frequency (RF) communication function. User interface technology is developing in the direction of increasing user sensitivity and ease of operation. User interfaces are evolving into touch UIs, voice recognition UIs, 3D UIs, and the like.

Touch UI tends to be essential to portable information devices, and is being applied to home appliances as well. The capacitive touch screen has advantages in durability and clarity compared to the conventional resistive film, and can be applied to various applications.

The content of the background art described above is technical information that the inventor of the present specification had for the purpose of derivation of the present specification or acquired in the process of derivation of the present specification, and must be referred to as known technology disclosed to the general public before the specification of the present specification. can't

An object of the present specification is to provide a display device capable of performing touch sensing driving without time division driving and simplifying the configuration of a touch sensor array.

In addition to the tasks of the present specification mentioned above, other features and advantages of the present specification may be described below or clearly understood by those of ordinary skill in the art to which the technical spirit of the present specification belongs from such descriptions and descriptions. will be.

A display device according to various examples of the present specification includes a display panel including a pixel connected to a data line and a reference line, a touch driving line crossing the reference line, and a touch sensor between the reference line and the touch driving line, the It may include a data driving circuit electrically connected to a data line and the reference line, and a touch driving circuit electrically connected to the touch driving line.

In the display device according to the present specification, touch sensing driving can be implemented during the display driving period without time division driving, and the Rx electrode pattern can be removed by touch sensing through the reference line, thereby simplifying the configuration of the touch sensor array, thereby luminance of pixels The difference may be improved, and a process for patterning the Rx electrode pattern may be excluded from the manufacturing process of the display device, thereby reducing the manufacturing cost of the display device and improving productivity.

In addition to the effects of the present specification mentioned above, other features and advantages of the present specification will be described below or will be clearly understood by those of ordinary skill in the art from such description and description.

1 is a block diagram schematically illustrating a display device according to various examples of the present specification.
2 is a circuit diagram illustrating a structure of a pixel of a display device according to various examples of the present specification.
3 is a diagram illustrating a structure of a pixel array connected to a gate driving circuit, a data driving circuit, and a touch driving circuit in a display device according to various examples of the present specification.
4 is a circuit diagram illustrating a touch sensing circuit applied to a pixel of a display device according to various examples of the present specification.
5 is a timing diagram illustrating an example of a signal related to a touch sensing driving in a display device according to various examples of the present specification.
6 is a timing diagram illustrating another example of a signal related to a touch sensing driving in a display device according to various examples of the present specification.

Advantages and features of the present specification, and methods for achieving them, will become apparent with reference to the various examples described below in detail in conjunction with the accompanying drawings. However, the present specification is not limited to the various examples disclosed below, but will be implemented in various different forms, and only the various examples of the present specification allow the disclosure of the present specification to be complete, and in the technical field to which the technical spirit of the present specification belongs It is provided to fully inform those of ordinary skill in the scope of the technical idea of the present specification, and examples of the present specification are only defined by the scope of the claims.

The shapes, sizes, proportions, angles, numbers, etc. disclosed in the drawings for explaining various examples of the present specification are exemplary and are not limited to the matters illustrated in the drawings of the present specification. Like reference numerals refer to like elements throughout. In addition, in describing an example of the present specification, if it is determined that a detailed description of a related known technology may unnecessarily obscure the subject matter of the present specification, the detailed description thereof will be omitted.

When 'including', 'having', 'consisting', etc. mentioned in this specification are used, other parts may be added unless 'only' is used. When a component is expressed in the singular, cases including the plural are included unless otherwise explicitly stated.

In interpreting the components, it is construed as including an error range even if there is no separate explicit description.

In the case of a description of the positional relationship, for example, when the positional relationship of two parts is described as 'on', 'on', 'on', 'beside', etc., 'right' Alternatively, one or more other parts may be positioned between two parts unless 'directly' is used.

In the case of a description of a temporal relationship, for example, 'immediately' or 'directly' when a temporal relationship is described with 'after', 'following', 'after', 'before', etc. It may include cases that are not continuous unless this is used.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish one component from another. Accordingly, the first component mentioned below may be the second component within the spirit of the present specification.

"First horizontal axis direction", "second horizontal axis direction" and "vertical axis direction" should not be construed only as a geometric relationship in which the relationship between each other is vertical, and the range in which the configuration of the present specification can function functionally It may mean to have a broader direction than within.

The term “at least one” should be understood to include all possible combinations from one or more related items. For example, the meaning of “at least one of the first, second, and third items” means that each of the first, second, or third items as well as two of the first, second and third items It may mean a combination of all items that can be presented from more than one.

Each of the features of the various examples of the present specification may be partially or wholly combined or combined with each other, technically various interlocking and driving are possible, and each example may be implemented independently of each other or may be implemented together in a related relationship. .

Hereinafter, preferred examples of display devices in various examples of the present specification will be described in detail with reference to the accompanying drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. And, since the scales of the components shown in the accompanying drawings have different scales from the actual for convenience of description, the scales shown in the drawings are not limited thereto.

In the present specification, an in-cell type touch screen may be applied to the display panel. In the in-cell touch screen, for example, Tx lines and Rx lines are formed by dividing a transparent common electrode that is commonly connected to pixels in a display panel and supplies a common voltage Vcom to the pixels, and the display driving period and the touch sensing period may be time-divided and driven. A touch may be sensed through the Rx electrode by applying a common voltage to the common electrode during the display driving period and applying a Tx signal to the Tx electrode divided from the common electrode during the touch sensing period.

However, when the common electrode is divided and patterned into the Tx electrode and the Rx electrode, the luminance of the pixels may be different because the loads connected to the Tx electrode pattern and the Rx electrode pattern are different from each other. In addition, since the display driving period and the touch sensing period are time-divided and driven, the gate pulse voltage is lowered in the display driving period after the touch sensing period, so that the luminance of pixels may be different from the luminance of other lines. As a result, a difference in luminance of pixels may be seen in the form of block division in the pixel array. In addition, in order to pattern the common electrode into the Tx electrode and the Rx electrode, the number of manufacturing processes for the pixel array increases, thereby increasing the manufacturing cost of the display device and decreasing productivity.

The inventors of the present specification recognize the above-mentioned problems, and touch sensing driving can be implemented during the display driving period without time division driving, and the Rx electrode pattern can be removed by touch sensing through a reference line, so that the configuration of the touch sensor array can be improved. A display device that can be simplified was invented.

Hereinafter, a display device according to various examples of the present specification will be described with reference to the accompanying drawings.

1 is a block diagram schematically illustrating a display device according to various examples of the present specification.

Referring to FIG. 1 , a display device 100 according to various examples of the present specification includes a display panel 110 , a timing controller 120 , a data driving circuit 130 , a level shifter 140 , and a gate driving circuit 150 . , a touch driving circuit 160 , and a host system 200 .

The display panel 110 may include a display area AA and a non-display area NA.

The display area AA is an area in which an image is displayed and may be defined in a central portion of the substrate. In the display area AA, a plurality of data lines DL, a plurality of reference lines RL, and a plurality of gate lines GL intersect each other, and pixels PXL are arranged in a matrix form in each intersection area. to form a pixel array. The pixels PXL may be defined as a region of a minimum unit emitting light. In addition, the pixels PXL may be arranged in various ways in addition to a matrix form to form a pixel array.

A plurality of pixels PXL and a plurality of signal lines may be disposed in the pixel array. The signal lines sense a driving characteristic of the pixels PXL by supplying a plurality of data lines DL for supplying a data signal (or data voltage) to the pixels PXL and a reference voltage to the pixels PXL. and a plurality of reference lines RL capable of functioning as a part of the touch sensor, and a plurality of gate lines GL for supplying a gate signal (or a gate clock signal) to the pixels PXL. can Each pixel PXL included in the pixel array may receive a first power voltage (or a high potential power voltage) and a second power voltage (or a low potential power voltage) from the power generator.

In the display panel 110 , a touch driving line TL crossing the reference line RL may be disposed. A touch sensor having mutual capacitance may be implemented between the touch driving line TL and the reference line RL. The touch driving line TL may function as a Tx electrode of the touch sensor, and the reference line RL may function as an Rx electrode of the touch sensor.

The reference line RL and the touch driving line TL may be disposed on different layers to cross each other. For example, one or more dielectric layers may be disposed between the reference line RL and the touch driving line TL, and one or more dielectric layers may be disposed to cross each other and overlap each other in some regions. A region where the reference line RL and the touch driving line TL overlap each other may be implemented as a touch sensor having a mutual capacitance.

Accordingly, since the display device according to various examples of the present specification implements the Rx electrode of the touch sensor in an integrated form with the reference line RL, there is no block-type pixel luminance non-uniformity due to the existing Tx and Rx line patterns, An additional process for patterning the Rx line in the touch sensor array can be eliminated.

The non-display area NA is an area in which an image is not displayed and may be defined at an edge portion of the substrate surrounding the display area AA.

The gate driving circuit 150 may be disposed on one side (or left side) of the non-display area NA in a gate in panel (GIP) manner. However, the technical spirit of the present specification is not necessarily limited thereto, and the gate driving circuit 150 includes at least one gate IC and includes a tape carrier package (TCP), a chip on film (COF), and a flexible print circuit (FPC). It may be mounted on a circuit film such as, etc. and attached to the display panel 110 by a tape automatic bonding (TAB) method, or may be mounted on the display panel 110 by a chip on glass (COG) method. Also, the gate driving circuit 150 may be disposed as separate gate driving circuits on one side and the other side (or right side) of the non-display area NA.

The touch driving circuit 160 may be disposed on the other side (or right side) of the non-display area NA. The touch driving circuit 160 may be a signal supply circuit electrically connected to the touch driving line TL and supplying a touch driving pulse to each of the touch driving lines TL. Although it is illustrated in FIG. 1 that the touch driving circuit 160 is disposed on the other side (or the right side) of the non-display area NA, the present invention is not limited thereto, and the touch driving circuit 160 touches the touch driving line TL. The supply of the driving pulse may be transformed into various possible forms.

The data driving circuit 130 may communicate with the timing controller 120 through a preset interface method. For example, an interface method between the data driving circuit 130 and the timing controller 120 may include Bus low voltage differential signaling (B-LVDS). In the B-LVDS interface method, multiple channels are connected between the timing controller 120 and the data driving circuit 130 , and digital data, control signals, or sensing data are converted into LVDS signal levels to be transmitted/received through multiple channels. Alternatively, the interface method between the data driving circuit 130 and the timing controller 120 may include an Embedded Clock Point-Point Interface (EPI) method. In the EPI method, digital data converted into an EPI protocol format, a control signal, or sensing data may be transmitted/received through a one-to-one channel between the timing controller 120 and the data driving circuit 130 .

The data driving circuit 130 may be electrically connected to the plurality of data lines DL and the plurality of reference lines RL. The data driving circuit 130 includes a plurality of source driver integrated circuits (ICs) and is mounted on a circuit film such as a tape carrier package (TCP), a chip on film (COF), a flexible print circuit (FPC), etc. ) may be attached to the display panel 110 using a tape automatic bonding (TAB) method or a chip on glass (COG) method.

The data driving circuit 130 receives the image data DATA and the data control signal DDC from the timing controller 120 to generate a data signal (or data voltage), and supplies the data signal to the data lines DL. can The data control signal DDC may include a source start pulse (SSP), a source sampling clock (SSC), and a source output enable signal (SOE). The source start pulse SSP controls the data sampling start timing of the data driving circuit 130 , the source sampling clock SSC is a clock signal that controls the data sampling timing according to the rising or falling timing, and the source output enable The signal SOE may control an output timing of the data driving circuit 130 . In addition, the data driving circuit 130 may receive a sensing signal related to driving characteristics of the pixels PXL through the reference line RL to generate sensing data, and provide the sensing data to the timing controller 120 . .

The data driving circuit 130 may detect a touch signal of the touch sensor between the reference line RL and the touch driving line TL through the reference line RL. The touch sensor may include a capacitor formed in a region where the reference line RL and the touch driving line TL that are disposed to cross each other with at least one dielectric layer therebetween overlap each other. For example, the touch driving circuit 160 supplies a touch driving pulse to the touch driving line TL, and the data driving circuit 130 is a touch sensor by the touch driving pulse supplied to the touch driving line TL. An electrical signal generated between the reference line RL and the touch driving line TL may be received from the reference line RL, and the touch signal may be detected using the received electrical signal. For example, the plurality of reference lines RL are disposed to be spaced apart from each other in the first direction (or the X-direction, the horizontal direction) of the display panel 110 , and the touch signal is transmitted through the plurality of reference lines RL. It refers to an electrical signal having a lower value than a preset value (eg, a reference value for determining the presence or absence of a touch) among received electric signals, and the reference line outputting a value lower than the preset value, that is, the X of the display panel 110 . Coordinates can be specified.

The data driving circuit 130 may provide the detected touch signal to the timing controller 120 in the form of raw data. Alternatively, the data driving circuit 130 may generate touch sensing data including level information and reference line information of the touch signal by using the detected touch signal, and may provide the touch sensing data to the timing controller 120 . Alternatively, the data driving circuit 130 may calculate first touch coordinates (or X coordinates) using a touch signal detected by itself, and provide the first touch coordinate information to the timing controller 120 .

The data driving circuit 130 may supply a data signal (or data voltage) to the pixel PXL through the data line DL and simultaneously detect the touch signal of the touch sensor through the reference line RL. The data driving circuit 130 calculates first touch coordinates (or X coordinates) by using the detected touch signal, and the second touch coordinates (or Y coordinates) based on the number of output data signals corresponding to the detection time of the touch signal. coordinates) can be calculated. For example, the data driving circuit 130 corresponds to a time point when a gate signal is supplied to the gate lines GL spaced apart from each other in the second direction (or Y direction, vertical direction) of the display panel 110 . A data signal may be provided to the plurality of data lines DL at once, and the Y coordinate of the gate line, that is, the display panel 110 may be specified using the number of output data signals. For example, the data driving circuit 130 counts the source output enable signal SOE related to the output of the data signal, and uses the count value corresponding to the time point at which the touch signal is detected to the second touch coordinates (or Y coordinates) can be calculated. The data driving circuit 130 may provide touch coordinate information including the first touch coordinates and the second touch coordinates to the timing controller 120 .

The level shifter 140 may be mounted on a printed circuit board 170 together with the timing controller 120 . The level shifter 140 applies a transistor-transistor-logic (TTL) level voltage of the gate control signal GDC input from the timing controller 120 to a gate-on voltage capable of driving the TFTs of the pixels PXL and a gate-off voltage. The voltage may be boosted and supplied to the gate driving circuit 150 . The gate control signal GDC may include a gate start pulse (GSP), a gate shift clock (GSC), a gate output enable signal (gate output enable, GOE), and the like.

The gate shift clock includes a rising shift clock GCLK that specifies the rising timing of at least one gate signal (or gate clock signal) and a falling shift clock MCLK that specifies the falling timing of at least one gate signal (or gate clock signal). ) and the like. The gate driving circuit 150 may be operated according to the gate control signal GDC input from the level shifter 140 to generate at least one gate signal (or a gate pulse signal). The gate driving circuit 150 may sequentially supply at least one gate signal to the plurality of gate lines GL. For example, the gate signal may include a separate sensing signal Sense (or a first gate clock signal) and a scan signal Scan (or a second gate clock signal). The sensing signal Sense and the scan signal Scan may be synchronized with the data signal. The sensing signal Sense and the scan signal Scan may have different rising timings. For example, the rising timing (or the first rising timing) of the sensing signal Sense may precede the rising timing (or the second rising timing) of the scan signal Scan. Also, the sensing signal Sense and the scan signal Scan may be identical to each other in the polling timing. However, the technical spirit of the present specification is not necessarily limited thereto, and the sensing signal Sense and the scan signal Scan may have the same rising and falling timing, or may be the same gate signal that is not separately distinguished.

The level shifter 140 may supply the gate control signal GDC to the touch driving circuit 160 . The touch driving circuit 160 may be operated according to the gate control signal GDC input from the level shifter 140 to generate a touch driving pulse. The touch driving circuit 160 may sequentially supply a touch driving pulse to the plurality of touch driving lines TL.

The touch driving circuit 160 may supply a touch driving pulse to the touch driving line TL adjacent to the gate line GL to which the gate signal is applied whenever the gate signal is applied to the gate line GL. In this case, the touch driving pulse may include a rising period, a sustain period, and a falling period, and the rising period and the falling period of the touch driving pulse may be synchronized with at least one gate signal (or a gate clock signal). For example, the gate signal may include a sensing signal (or a first gate clock signal) and a scan signal (or a second gate clock signal) having different rising timings, and may include a touch driving pulse. The rising period may be synchronized with the rising timing (or the first rising timing) of the sensing signal Sense, and the falling period of the touch driving pulse may be synchronized with the rising timing (or the second rising timing) of the scan signal Scan.

The touch driving circuit 160 may supply a touch driving pulse to the touch driving line TL adjacent to the selected gate line GL for every predetermined pixel line within one frame. In this case, the touch driving pulse may be set to a sustain period within one horizontal period (1H). For example, the gate signal may include a plurality of gate signals sequentially shifted within one frame, and may include a touch driving gate signal defining touch driving for each predetermined pixel line among the plurality of gate signals, and a touch driving pulse A rising period and a falling period of may be synchronized with the touch driving gate signal. For example, the touch driving gate signal includes a sensing touch driving gate signal (or a first touch driving gate clock signal) and a scanning touch driving gate signal (or a second touch driving gate clock signal) having different pulse widths. The rising period of the touch driving pulse may be synchronized with the rising timing of the sensing touch driving gate signal, and the falling period of the touch driving pulse may be synchronized with the rising timing of the scanning touch driving gate signal.

The timing controller 120 may be mounted on the printed circuit board 170 together with the level shifter 140 . The timing controller 120 may be connected to the external host system 200 through various interface methods, and may be connected to the data driving circuit 130 and the level shifter 140 . The timing controller 120 receives external timing signals such as a vertical synchronization signal (Vsync), a horizontal synchronization signal (Hsync), a data enable signal (DE), and a dot clock input from the host system 200, A gate control signal GDC and a data control signal DDC for controlling each of the data driving circuit 130 , the level shifter 140 , the gate driving circuit 150 , and the touch driving circuit 160 based on the received timing signal ) can be created. The timing controller 120 may supply the gate control signal GDC to the level shifter 140 and supply the data control signal DDC to the data driving circuit 130 . The timing controller 120 may receive image data DATA from the host system 200 and may receive sensing data from the data driving circuit 130 . The timing controller 120 may correct the image data DATA to compensate for a luminance deviation due to a difference in driving characteristics of the pixels PXL, and then transmit the corrected image data DATA to the data driving circuit 130 .

The timing controller 120 may receive a touch signal in the form of raw data from the data driving circuit 130 . Alternatively, the timing controller 120 may receive touch sensing data including level information of a touch signal and reference line information from the data driving circuit 130 . Alternatively, the timing controller 120 may receive touch coordinate information calculated by the data driving circuit 130 itself.

The timing controller 120 may calculate touch coordinates based on information (touch signal, touch sensing data, or touch coordinate information) received from the data driving circuit 130 . The timing controller 120 may provide the calculated touch coordinate information to the host system 200 .

The timing controller 120 may calculate the first touch coordinates (or X coordinates) based on a touch signal that is raw data supplied from the data driving circuit 130 . For example, the timing controller 120 specifies the reference line RL outputting a value lower than a preset value (eg, a reference value for determining the presence or absence of a touch) from the touch signal, that is, the X coordinate of the display panel 110 , and , the intensity of the touch may be calculated based on the level value of the touch signal.

The timing controller 120 may calculate the second touch coordinate (or Y coordinate) based on the number of at least one gate signal (or gate clock signal) and the touch signal supplied from the data driving circuit 130 . For example, at least one gate signal is shifted and sequentially provided to the gate lines GL disposed to be spaced apart from each other in the second direction (or Y direction, vertical direction) of the display panel 110 , so that at least one gate signal is provided. By using the number of gate signals of , it is possible to specify the Y coordinate of the gate line, that is, the display panel 110 . For example, the timing controller 120 generates a rising shift clock GCLK designating a rising timing of at least one gate signal (or a gate clock signal) and a falling shift clock MCLK designating a falling timing, and rising The shift clock GCLK or the falling shift clock MCLK may be counted, and the second touch coordinate (or Y coordinate) is calculated using a count value corresponding to a time point when the touch signal is supplied from the data driving circuit 130 . can do. The timing controller 120 may calculate the second touch coordinates (or Y coordinates) by using count information of the polling shift clock MCLK in order to calculate more accurate touch coordinates in consideration of the delay of transmission and reception of the touch signal.

2 is a circuit diagram illustrating a structure of a pixel of a display device according to various examples of the present specification.

Referring to FIG. 2 , in the display device 100 according to various examples of the present specification, each pixel PXL includes a light emitting device ED, a driving transistor DT for driving the light emitting device ED, and a driving device. The first transistor T1 for transferring the data signal (or data voltage) to the first node N1 corresponding to the gate node of the transistor DT, and the data signal corresponding to the image signal voltage or a voltage corresponding thereto It may include a storage capacitor Cst maintained for one frame period, a second transistor T2 disposed between the second node N2 of the driving transistor DT and the reference line RL, and the like.

The light emitting device ED may include a first electrode (or an anode electrode), an organic layer, and a second electrode (or a cathode electrode). For example, the light emitting device ED may be an organic light emitting diode (OLED). The second electrode of the light emitting device ED may be connected to a second power voltage EVSS. The driving transistor DT may drive the light emitting device ED by supplying a driving current to the light emitting device ED.

In the driving transistor DT, a first electrode and a second electrode may be disposed between the first power voltage EVDD and the second node N2 , and a gate electrode may be connected to the first node N1 .

The first transistor T1 is electrically connected between the data line DL to which the first electrode and the second electrode supply the data signal Vdata and the first node N1 of the driving transistor DT, and a gate electrode It may be connected to the gate line GL to which the scan signal Scan (or the second gate clock signal) is applied. The first transistor T1 may be controlled by a scan signal Scan. The first transistor T1 is turned on by the scan signal Scan to transmit the data signal Vdata supplied from the data line DL to the first node N1 of the driving transistor DT.

The storage capacitor Cst may be electrically connected between the first node N1 and the second node N2 of the driving transistor DT.

In the second transistor T2 , the first electrode and the second electrode are disposed between the second node N2 and the reference line RL, and the gate electrode applies the sensing signal Sense (or the first gate clock signal). may be connected to the gate line GL. The second transistor T2 may be controlled by a sensing signal Sense. The second transistor T2 may be turned on by the sensing signal Sense to apply the reference voltage Vref supplied through the reference line RL to the second node N2 of the driving transistor DT. Also, the second transistor T2 may be used as one of the voltage sensing paths for the second node N2 of the driving transistor DT.

The sensing signal Sense (or the first gate clock signal) and the scan signal Scan (or the second gate clock signal) may be separate gate signals. In this case, the sensing signal Sense and the scan signal Scan may be respectively applied to the gate node of the first transistor T1 and the gate node of the second transistor T2 through different gate lines.

According to various examples of the present specification, the sensing signal Sense (or the first gate clock signal) and the scan signal Scan (or the second gate clock signal) may have different rising timings. The difference between the rising timing of the sensing signal Sense and the scan signal Scan may be used to generate a touch driving pulse. For example, the rising timing (or the first rising timing) of the sensing signal Sense may precede the rising timing (or the second rising timing) of the scan signal Scan. Also, the sensing signal Sense and the scan signal Scan may be identical to each other in the polling timing. The touch driving circuit 160 may generate a touch driving pulse based on the sensing signal Sense and the scan signal Scan. For example, the rising period of the touch driving pulse is synchronized with the rising timing (or the first rising timing) of the sensing signal Sense, and the falling period of the touch driving pulse is the rising timing (or the second rising timing) of the scan signal Scan. timing) can be synchronized.

3 is a diagram illustrating a structure of a pixel array connected to a gate driving circuit, a data driving circuit, and a touch driving circuit in a display device according to various examples of the present specification.

Referring to FIG. 3 , a plurality of pixels PXL and a plurality of signal lines may be disposed in the pixel array. The signal lines sense a driving characteristic of the pixels PXL by supplying a plurality of data lines DL for supplying a data signal (or data voltage) to the pixels PXL and a reference voltage to the pixels PXL. and a plurality of reference lines RL capable of functioning as a part of the touch sensor, and a plurality of gate lines GL for supplying a gate signal (or a gate clock signal) to the pixels PXL. can

The plurality of gate lines GL may be electrically connected to the gate driving circuit 150 and may provide at least one gate signal sequentially supplied from the gate driving circuit 150 to each of the pixels PXL. . The plurality of gate lines GL may be disposed to be spaced apart from each other in the second direction (or Y direction, or vertical direction) of the display panel 110 .

The plurality of data lines DL may be electrically connected to the data driving circuit 130 and may provide a data signal supplied from the data driving circuit 130 to each of the pixels PXL.

The plurality of reference lines RL may be electrically connected to the data driving circuit 130 , and may sense driving characteristics of the pixels PXL by supplying a reference voltage to the pixels PXL, and may be a part of the touch sensor. can function as

The plurality of touch driving lines TL may be electrically connected to the touch driving circuit 160 and may receive touch driving pulses sequentially from the touch driving circuit 160 . The plurality of touch driving lines TL may be disposed to cross the reference line RL.

A touch sensor having mutual capacitance may be implemented between the touch driving line TL and the reference line RL. The touch driving line TL may function as a Tx electrode of the touch sensor, and the reference line RL may function as an Rx electrode of the touch sensor.

The touch driving line TL and the reference line RL may be disposed on different layers to cross each other. For example, one or more dielectric layers may be disposed between the reference line RL and the touch driving line TL, and one or more dielectric layers may be disposed to cross each other and overlap each other in some regions. A region where the reference line RL and the touch driving line TL overlap each other may be implemented as a touch sensor having a mutual capacitance. For example, the first touch electrode RL_Rx having a shape protruding from the reference line RL may be included in a partial region overlapping the touch driving line TL in the reference line RL. In addition, a portion of the touch driving line TL that overlaps the reference line RL has a shape protruding from the touch driving line TL, and the second touch electrode TL_Tx overlaps the first touch electrode RL_Rx. ) may be included. In FIG. 3 , the first touch electrode RL_Rx and the second touch electrode TL_Tx correspond one-to-one, and the size of the second touch electrode TL_Tx is shown to be larger than that of the first touch electrode RL_Rx. No, the first touch electrode RL_Rx and the second touch electrode TL_Tx may be transformed into various shapes capable of sensing a change in mutual capacitance. For example, one second touch electrode TL_Tx covers the plurality of first touch electrodes RL_Rx, or the second touch electrode TL_Tx is disposed between the plurality of first touch electrodes RL_Rx. It may be in the form of

4 is a circuit diagram illustrating a touch sensing circuit applied to a pixel of a display device according to various examples of the present specification.

Referring to FIG. 4 , each pixel PXL may include a touch sensor having a mutual capacitance Cm between the reference line RL and the touch driving line TL.

A first switch SW1 that controls whether the reference voltage Vref is applied may be connected to the reference line RL. The first switch SW1 may be controlled by the initialization signal RPRE, and when the high level initialization signal RPRE is applied, the first switch SW1 may be turned on. The initialization signal RPRE may be generated by the timing controller 120 , but is not limited thereto.

A second switch SW2 for controlling whether to connect to an analog to digital converter (ADC) 135 for detecting an electrical signal through the reference line RL may be connected to one end of the reference line RL. have. The second switch SW2 may be controlled by the sampling signal SAM, and when the high level sampling signal SAM is applied, the second switch SW2 may be turned on. The sampling signal SAM may be generated by the timing controller 120 , but is not limited thereto.

The initialization signal RPRE and the sampling signal SAM may be signals synchronized with the touch driving pulse generated by the touch driving circuit 160 . For example, when the touch driving pulse has a high level, the signal level of the initialization signal RPRE may have a low level opposite to the touch driving pulse, and the signal level of the sampling signal SAM is the same as the touch driving pulse. You can have a high level.

When a touch driving pulse is applied to the touch driving line TL, the timing controller 120 sets the first switch SW1 at a low level so that the reference line RL corresponding to the pixel line may electrically float. The first switch SW1 may be turned off by applying the initialization signal RPRE.

When a touch driving pulse is applied to the touch driving line TL, the timing controller 120 sets the second switch SW2 high so that the touch signal can be detected through the reference line RL corresponding to the pixel line. The second switch SW2 may be turned on by applying the sampling signal SAM of the level.

5 is a timing diagram illustrating an example of a signal related to a touch sensing driving in a display device according to various examples of the present specification.

Referring to FIG. 5 , in the touch sensing driving according to an example of the present specification, a touch driving pulse is generated and supplied to the touch driving line TL to be synchronized every time a gate signal is applied to the gate line GL. can be implemented.

The touch driving circuit 160 may sequentially supply a touch driving pulse to the plurality of touch driving lines TL.

The touch driving circuit 160 may supply a touch driving pulse to the touch driving line TL adjacent to the gate line GL to which the gate signal is applied whenever the gate signal is applied to the gate line GL.

As shown in FIG. 5 , the scan signals SCCLK1 , SCCLK2 , SCCLK3 , and SCCLK4 may rise according to the rising shift clock GCLK_SC and may be shifted to be polled according to the falling shift clock MCLK_SC and then output.

The sensing signals SECLK1 , SECLK2 , SECLK3 , and SECLK4 may rise according to the rising shift clock GCLK_SE and may be shifted to be polled according to the falling shift clock MCLK_SE and output. In this case, the sensing rising shift clock GCLK_SE may be controlled so that the rising timing of the sensing signals SECLK1, SECLK2, SECLK3, and SECLK4 is ahead of the scan signals SCCLK1, SCCLK2, SCCLK3, SCCLK4.

The rising timing of the touch driving pulse Tx_Signal is synchronized with the rising timing of the sensing signals SECLK1, SECLK2, SECLK3, and SECLK4, and the falling timing of the touch driving pulse Tx_Signal is that of the scan signals SCCLK1, SCCLK2, SCCLK3, and SCCLK4. It may be generated to be synchronized with the rising timing.

The touch driving pulse Tx_Signal may be sensed as the touch signal RL_Sense through the reference line RL. The initialization signal PPRE may have a low level signal corresponding to the high level of the touch driving pulse Tx_Signal so that the reference line RL may be implemented as a touch sensor, and the sampling signal SAM may have a high level of a high level signal. can have a signal.

6 is a timing diagram illustrating another example of a signal related to a touch sensing driving in a display device according to various examples of the present specification.

Referring to FIG. 6 , in the touch sensing driving according to another example of the present specification, a touch driving pulse is generated so as to be synchronized with a time point when a gate signal is applied to a selected gate line GL for each predetermined pixel line within one frame to drive the touch. It can be implemented by supplying the line TL.

The touch driving circuit 160 may supply a touch driving pulse to the touch driving line TL adjacent to the selected gate line GL for every predetermined pixel line within one frame.

6 , the scan signals SCCLK1 to SCCLK8 may rise according to the rising shift clock GCLK_SC and may be shifted to be polled according to the falling shift clock MCLK_SC and then output. In this case, the pulse interval of the fifth scan signal SCCLK5 is the rising shift clock GCLK_SC for scan and the falling shift clock MCLK_SC so that a touch driving time can be defined for each predetermined pixel line (eg, 8 pixel lines). can be adjusted.

The sensing signals SECLK1 to SECLK4 may rise according to the rising shift clock GCLK_SE and may be shifted to be outputted to be polled according to the falling shift clock MCLK_SE. In this case, the sensing rising shift clock GCLK_SE and the falling shift clock MCLK_SE have a pulse interval of the fifth sensing signal SECLK5 so that a touch driving time can be defined for each predetermined pixel line (eg, 8 pixel lines). can be adjusted. Also, the sensing rising shift clock GCLK_SE may be controlled such that a pulse width of the fifth sensing signal SECLK5 is longer than a pulse width of the fifth scan signal SCCLK5 .

The rising timing of the touch driving pulse Tx_Signal is synchronized with the rising timing of the fifth sensing signal SECLK5 defining the touch driving timing for each predetermined pixel line within one frame, and the falling timing of the touch driving pulse Tx_Signal is the fifth It may be generated to be synchronized with the rising timing of the scan signal SCCLK5.

The touch driving pulse Tx_Signal may be sensed as the touch signal RL_Sense through the reference line RL.

The touch sensing driving method illustrated in FIG. 6 may additionally secure a charging time of the touch driving pulse Tx_Signal compared to the touch sensing driving method illustrated in FIG. 5 .

A display device according to various examples of the present specification may be described as follows.

A display device according to various examples of the present specification includes a display panel including a pixel connected to a data line and a reference line, a touch driving line crossing the reference line, and a touch sensor between the reference line and the touch driving line, the It may include a data driving circuit electrically connected to a data line and the reference line, and a touch driving circuit electrically connected to the touch driving line.

According to the display device according to various examples of the present specification, the data driving circuit may detect a touch signal of the touch sensor through the reference line.

According to the display device according to various examples of the present specification, the data driving circuit may supply a data signal to the pixel through the data line and simultaneously detect the touch signal of the touch sensor through the reference line.

According to the display device according to various examples of the present specification, the touch sensor may include a capacitor formed between the reference line and the touch driving line.

According to the display device according to various examples of the present specification, the touch sensor may include a first touch electrode protruding from the reference line, a second touch electrode protruding from the touch driving line and overlapping the first touch electrode, and the A dielectric layer may be included between the first touch electrode and the second touch electrode.

According to the display device according to various examples of the present specification, the data driving circuit may calculate the first touch coordinates by detecting the touch signal of the touch sensor.

According to the display device according to various examples of the present specification, the data driving circuit calculates first touch coordinates through detection of the touch signal of the touch sensor, and outputs the data signal corresponding to the detection time of the touch signal The second touch coordinates may be calculated based on the number.

According to the display device according to various examples of the present specification, the touch driving circuit may supply a touch driving pulse for driving the touch sensor to the touch driving line.

According to the display device according to various examples of the present specification, the data driving circuit receives an electrical signal generated by the touch driving pulse supplied to the touch driving line from the reference line, and uses the received electrical signal to make a touch. signal can be detected.

According to the display device according to various examples of the present specification, the reference line may be electrically floated in synchronization with the touch driving pulse.

According to the display device according to various examples of the present specification, the display panel further includes a gate line connected to the pixel, a gate driving circuit driving the gate line, the data driving circuit, the touch driving circuit, and the and a timing controller controlling each of the gate driving circuits and supplying at least one gate clock signal to the gate driving circuit, wherein the touch driving circuit generates a touch driving pulse based on the at least one gate clock signal. It can be supplied to the touch driving line.

According to the display device according to various examples of the present specification, the data driving circuit detects a touch signal of the touch sensor by the touch driving pulse through the reference line and supplies it to the timing controller, and the timing controller provides the data The first touch coordinates may be calculated based on the touch signal supplied from the driving circuit.

According to the display device according to various examples of the present specification, the timing controller may calculate second touch coordinates based on the number of the at least one gate clock signal and the touch signal supplied from the data driving circuit.

According to the display device according to various examples of the present specification, the timing controller generates a rising shift clock designating a rising timing of the at least one gate clock signal and a falling shift clock designating a falling timing, and receives the data from the data driving circuit. The second touch coordinates may be calculated based on the number of the rising shift clocks or the falling shift clocks corresponding to when the touch signal is supplied.

According to the display device according to various examples of the present specification, the at least one gate clock signal includes a first gate clock signal and a second gate clock signal having different rising timings, and the touch driving pulse includes a rising period, a sustain period, and a falling period, wherein a rising period of the touch driving pulse is synchronized with a first rising timing of the first gate clock signal, and a falling period of the touch driving pulse is synchronized with a second rising timing of the second gate clock signal. can be synchronized.

According to the display device according to various examples of the present specification, the first rising timing of the first gate clock signal is ahead of the second rising timing of the second gate clock signal, and the first falling timing of the first gate clock signal The timing and the second polling timing of the second gate clock signal may be the same.

According to the display device according to various examples of the present specification, the first gate clock signal may be a sensing signal, and the second gate clock signal may be a scan signal.

According to the display device according to various examples of the present specification, the at least one gate clock signal includes a plurality of first gate clock signals and a plurality of second gate clock signals sequentially shifted within one frame, and the plurality of gate clock signals are sequentially shifted within one frame. A touch driving is defined for each predetermined pixel line among the first and second gate clock signals and includes a first touch driving gate clock signal and a second touch driving gate clock signal having different pulse widths, wherein the touch driving pulse includes a rising period; It includes a sustain period and a falling period, wherein the rising period of the touch driving pulse is synchronized with the rising timing of the first touch driving gate clock signal, and the falling period of the touch driving pulse is the second touch driving gate clock signal. It may be synchronized with the rising timing.

According to the display device according to various examples of the present specification, a pulse width of the first touch driving gate clock signal is longer than a pulse width of the second touch driving gate clock signal, and a rising timing of the first touch driving gate clock signal is A rising timing of the second BDI gate clock signal may be preceded, and a falling timing of the first touch driving gate clock signal and a falling timing of the second touch driving gate clock signal may be the same.

According to the display device according to various examples of the present specification, among the plurality of first and second gate clock signals, the remaining gate clock signals except for the first and second touch driving gate clock signals may have the same rising timing and the same falling timing. can

The present specification described above is not limited to the above-described embodiments and the accompanying drawings, and it is common in the technical field to which this specification belongs that various substitutions, modifications, and changes are possible without departing from the technical matters of the present specification. It will be clear to those who have the knowledge of Therefore, the scope of the present specification is indicated by the following claims, 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 specification.

100: display device 110: display panel
120: timing controller 130: data driving circuit
140: level shifter 150: gate driving circuit
160: touch driving circuit 170: printed circuit board
200: host system

Claims (20)

a display panel including a pixel connected to a data line and a reference line, a touch driving line crossing the reference line, and a touch sensor between the reference line and the touch driving line;
a data driving circuit electrically connected to the data line and the reference line; and
and a touch driving circuit electrically connected to the touch driving line. According to claim 1,
and the data driving circuit detects a touch signal of the touch sensor through the reference line. 3. The method of claim 2,
The data driving circuit supplies a data signal to the pixel through the data line and simultaneously detects the touch signal of the touch sensor through the reference line. According to claim 1,
The touch sensor includes a capacitor formed between the reference line and the touch driving line. 5. The method of claim 4,
The touch sensor is
a first touch electrode protruding from the reference line;
a second touch electrode protruding from the touch driving line and overlapping the first touch electrode; and
and a dielectric layer between the first touch electrode and the second touch electrode. 3. The method of claim 2,
and the data driving circuit calculates first touch coordinates through detection of the touch signal of the touch sensor. 4. The method of claim 3,
wherein the data driving circuit calculates first touch coordinates through detection of the touch signal by the touch sensor, and calculates second touch coordinates based on the number of outputs of the data signal corresponding to the detection time of the touch signal, display device. According to claim 1,
The touch driving circuit supplies a touch driving pulse for driving the touch sensor to the touch driving line. 9. The method of claim 8,
The data driving circuit receives an electrical signal generated by the touch driving pulse supplied to the touch driving line from the reference line, and detects a touch signal by using the received electrical signal. 10. The method of claim 9,
and the reference line is electrically floated in synchronization with the touch driving pulse. According to claim 1,
the display panel further includes a gate line connected to the pixel;
a gate driving circuit for driving the gate line; and
a timing controller for controlling each of the data driving circuit, the touch driving circuit, and the gate driving circuit, and supplying at least one gate clock signal to the gate driving circuit;
The touch driving circuit generates a touch driving pulse based on the at least one gate clock signal and supplies it to the touch driving line. 12. The method of claim 11,
the data driving circuit detects the touch signal of the touch sensor by the touch driving pulse through the reference line and supplies it to the timing controller;
and the timing controller calculates first touch coordinates based on the touch signal supplied from the data driving circuit. 13. The method of claim 12,
and the timing controller calculates second touch coordinates based on the number of the at least one gate clock signal and the touch signal supplied from the data driving circuit. 14. The method of claim 13,
the timing controller generates a rising shift clock designating a rising timing of the at least one gate clock signal and a falling shift clock designating a falling timing,
and calculating the second touch coordinates based on the number of the rising shift clocks or the falling shift clocks corresponding to when the touch signal is supplied from the data driving circuit. 12. The method of claim 11,
The at least one gate clock signal includes a first gate clock signal and a second gate clock signal having different rising timings,
The touch driving pulse includes a rising period, a sustain period, and a polling period,
A rising period of the touch driving pulse is synchronized with a first rising timing of the first gate clock signal,
A falling period of the touch driving pulse is synchronized with a second rising timing of the second gate clock signal. 16. The method of claim 15,
The first rising timing of the first gate clock signal is ahead of the second rising timing of the second gate clock signal,
The display device of claim 1, wherein the first falling timing of the first gate clock signal and the second falling timing of the second gate clock signal are the same. 17. The method of claim 16,
The first gate clock signal is a sensing signal,
and the second gate clock signal is a scan signal. 12. The method of claim 11,
the at least one gate clock signal includes a plurality of first gate clock signals and a plurality of second gate clock signals sequentially shifted within one frame;
Defines touch driving for each predetermined pixel line among the plurality of first and second gate clock signals and includes a first touch driving gate clock signal and a second touch driving gate clock signal having different pulse widths;
The touch driving pulse includes a rising period, a sustain period, and a polling period,
A rising period of the touch driving pulse is synchronized with a rising timing of the first touch driving gate clock signal;
A falling period of the touch driving pulse is synchronized with a rising timing of the second touch driving gate clock signal. 19. The method of claim 18,
a pulse width of the first touch driving gate clock signal is longer than a pulse width of the second touch driving gate clock signal;
a rising timing of the first touch driving gate clock signal is ahead of a rising timing of the second touch driving gate clock signal;
and a falling timing of the first touch driving gate clock signal and a falling timing of the second touch driving gate clock signal are the same. 20. The method of claim 19,
and a rising timing and a falling timing of gate clock signals other than the first and second touch driving gate clock signals among the plurality of first and second gate clock signals are the same.

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