Display device and mobile electronic device including the same

Abstract

The invention discloses a display device and a mobile electronic device including the same. The display device includes: a display panel including a touch electrode; and a touch driving circuit including a driving signal output unit configured to output a touch driving signal supplied to the touch electrode and a touch control unit configured to control the driving signal output unit. The touch control unit is configured to set the touch driving signal to swing between a first voltage and a second voltage higher than the first voltage, and to swing between the first voltage and the second voltage during a rising edge period in which the touch driving signal rises from the first voltage to the second voltage, the touch control signal is set to rise to a third voltage higher than the second voltage and then fall from the third voltage to the second voltage, and during a falling edge period in which the touch driving signal falls from the second voltage to the first voltage, the touch driving signal is set to drop to a fourth voltage lower than the first voltage and then rise from the fourth voltage to the first voltage.

Description

Technical Field

[0001] The present disclosure relates to displays, and more particularly, to a display device and a mobile electronic device including the display device. Background Art

[0002] With the development of the information society, the demand for display devices for displaying images in various electronic devices is increasing. The display device may be a flat panel display such as a liquid crystal display (LCD), a field emission display, or a light-emitting display panel. Examples of light-emitting display panels include an organic light-emitting diode (OLED) display device including an organic light-emitting diode element as a light-emitting element or an inorganic light-emitting diode display device including an inorganic light-emitting diode element as a light-emitting element.

[0003] The display panel may include a touch panel as an input device. A touch driving circuit driving the touch panel generates a touch driving signal for driving the touch electrodes of the touch panel. However, the touch driving signal for driving the touch electrodes of the touch panel may cause noise, which may cause flickering in the display panel. Summary of the invention

[0004] A display device includes: a display panel including touch electrodes; and a touch drive circuit including a drive signal output unit configured to output a touch drive signal supplied to the touch electrodes and a touch control unit configured to control the drive signal output unit. The touch control unit is configured to: set the touch drive signal to swing between a first voltage and a second voltage higher than the first voltage, set the touch drive signal to rise to a third voltage higher than the second voltage and then drop from the third voltage to the second voltage during a rising edge period when the touch drive signal rises from the first voltage to the second voltage, and set the touch drive signal to drop to a fourth voltage lower than the first voltage and then rise from the fourth voltage to the first voltage during a falling edge period when the touch drive signal drops from the second voltage to the first voltage.

[0005] The period for outputting the touch drive signal may include: a rising edge period, during which the touch drive signal rises from the first voltage to the third voltage and then drops from the third voltage to the second voltage; a high level period, during which the touch drive signal maintains the second voltage; a falling edge period, during which the touch drive signal drops from the second voltage to the fourth voltage and then rises from the fourth voltage to the first voltage; and a low level period, during which the touch drive signal maintains the first voltage.

[0006] The length of the rising edge period may be shorter than the length of the high level period.

[0007] The length of the falling edge period may be shorter than the length of the low level period.

[0008] The length of the high level period may be the same as the length of the low level period.

[0009] The touch control unit may be configured to set a first voltage difference between the third voltage and the second voltage to about 30% of a second voltage difference between the first voltage and the third voltage.

[0010] The touch control unit may be configured to set a third voltage difference between the fourth voltage and the first voltage to about 30% of a fourth voltage difference between the second voltage and the fourth voltage.

[0011] The touch control unit may be configured to set the first voltage difference and the third voltage difference to be the same.

[0012] The touch driving circuit may further include a charge pump configured to generate the first voltage, the second voltage, the third voltage, and the fourth voltage.

[0013] The touch electrodes may be configured to sense touch in a capacitive manner.

[0014] A mobile electronic device includes: a display panel including touch electrodes; and a touch drive circuit including a drive signal output unit configured to output a touch drive signal supplied to the touch electrodes and a touch control unit configured to control the drive signal output unit. The touch control unit is configured to: set the touch drive signal to swing between a first voltage and a second voltage higher than the first voltage, set the touch drive signal to rise to a third voltage higher than the second voltage and then drop from the third voltage to the second voltage during a rising edge period when the touch drive signal rises from the first voltage to the second voltage, and set the touch drive signal to drop to a fourth voltage lower than the first voltage and then rise from the fourth voltage to the first voltage during a falling edge period when the touch drive signal drops from the second voltage to the first voltage.

[0015] The period for outputting the touch drive signal may include: a rising edge period, during which the touch drive signal rises from the first voltage to the third voltage and then drops from the third voltage to the second voltage; a high level period, during which the touch drive signal maintains the second voltage; a falling edge period, during which the touch drive signal drops from the second voltage to the fourth voltage and then rises from the fourth voltage to the first voltage; and a low level period, during which the touch drive signal maintains the first voltage.

[0016] The length of the rising edge period may be shorter than the length of the high level period.

[0017] The length of the falling edge period may be shorter than the length of the low level period.

[0018] The length of the high level period may be the same as the length of the low level period.

[0019] The touch control unit may be configured to set a first voltage difference between the third voltage and the second voltage to about 30% of a second voltage difference between the first voltage and the third voltage.

[0020] The touch control unit may be configured to set a third voltage difference between the fourth voltage and the first voltage to about 30% of a fourth voltage difference between the second voltage and the fourth voltage.

[0021] The touch control unit may be configured to set the first voltage difference and the third voltage difference to be the same.

[0022] The touch driving circuit may further include a charge pump configured to generate the first voltage, the second voltage, the third voltage, and the fourth voltage.

[0023] The touch electrodes may be configured to sense touch in a capacitive manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other aspects and features of the present disclosure will become more apparent by describing in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0025] Figure 1 is a schematic perspective view of a display device according to an exemplary embodiment of the present disclosure;

[0026] Figure 2 is a schematic cross-sectional view of a display device according to an exemplary embodiment of the present disclosure;

[0027] Figure 3 is a conceptual diagram of a display unit and a touch driving circuit according to an exemplary embodiment of the present disclosure;

[0028] Figure 4 is a schematic plan view illustrating a display unit of a display device according to an exemplary embodiment of the present disclosure;

[0029] Figure 5 is a plan view illustrating a touch unit of a display device according to an exemplary embodiment of the present disclosure;

[0030] Figure 6 yes Figure 5 An enlarged view of area A1;

[0031] Figure 7 is an enlarged view illustrating a portion of a display device according to an exemplary embodiment of the present disclosure;

[0032] Figure 8 is along Figure 7 A cross-sectional view of a display device according to an exemplary embodiment of the present disclosure taken along line II';

[0033] Fig. 9 is a block diagram schematically illustrating components of a touch unit and a touch driving circuit according to an exemplary embodiment of the present disclosure; and

[0034] Fig.10 is a waveform diagram illustrating a touch driving signal according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] The present invention will now be described more fully hereinafter with reference to the accompanying drawings in which embodiments of the invention are shown. However, the present invention may be embodied in different forms and should not necessarily be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the present invention to those skilled in the art.

[0036] It will also be understood that when a layer is referred to as being “on” another layer or substrate, it can be directly on the other layer or substrate, or intervening layers may also be present. Like reference numerals may refer to like components throughout the specification and drawings.

[0037] It will be understood that although the terms "first", "second", etc. may be used herein to describe various elements, these elements should not necessarily be limited by these terms. These terms are used to distinguish one element from another element. For example, the first element discussed below may be referred to as the second element without departing from the teachings of the present invention. Similarly, the second element may also be referred to as the first element.

[0038] The features of each of the various embodiments of the present disclosure may be partially or completely combined with each other, and may technically cooperate with each other in various ways, and the various embodiments may be implemented independently of each other or may be implemented together in association with each other.

[0039] Hereinafter, specific embodiments will be described with reference to the accompanying drawings.

[0040] Figure 1 is a schematic perspective view of a display device according to an embodiment of the present disclosure. Figure 2 is a schematic cross-sectional view of a display device according to an exemplary embodiment of the present disclosure.

[0041] In the drawings, a first direction X is a direction parallel to one side of the display device 10 in a plan view, and refers to the direction of a pair of short sides of the display device 10. A second direction Y is a direction parallel to the other side of the display device 10 in contact with the one side in a plan view, and refers to the direction of a pair of long sides of the display device 10. A third direction Z may refer to a thickness direction of the display device 10. However, it should be understood that the directions mentioned in the exemplary embodiments refer to relative directions, and the exemplary embodiments are not necessarily limited to the mentioned directions.

[0042] The display device 10 may include various electronic devices that provide a display screen. For example, the display device 10 may be applied to portable electronic devices such as mobile phones, smart phones, tablet personal computers (PCs), mobile communication terminals, electronic notebooks, electronic books, portable multimedia players (PMPs), navigation systems, and ultra-mobile PCs (UMPCs). For example, the display device 10 may be applied to a display unit DU of a television, a laptop computer, a computer monitor, a digital billboard, or an Internet of Things (IOT) device. In addition, the display device 10 may be applied to wearable devices such as smart watches, watch phones, glasses-type displays, and head-mounted displays (HMDs).

[0043] refer to Figure 1 , the display device 10 may be formed in a planar shape similar to a quadrilateral. For example, the display device 10 may have a planar shape similar to a quadrilateral having a pair of short sides extending in the first direction X and a pair of long sides extending in the second direction Y. The corners where the short sides extending in the first direction X and the long sides extending in the second direction Y intersect may be rounded to have a predetermined curvature or may have a right angle shape. The planar shape of the display device 10 is not necessarily limited to a quadrilateral, and may have a shape similar to other polygons, a circle, or an ellipse.

[0044] At least one of the front surface and the rear surface of the display device 10 may be a display surface. Here, the “front surface” refers to a surface located on one side of a plane and located in the third direction Z in the figure, and the “rear surface” refers to a surface located on the other side of a plane and located in the direction opposite to the third direction Z in the figure. The display device 10 may be a double-sided display device 10 in which display is performed on both the front surface and the rear surface, but hereinafter, an exemplary embodiment in which the display surface is located on the front surface of the display device 10 will be mainly described.

[0045] The display device 10 includes a display panel 100 providing a display screen, a display driving circuit 200, a circuit board 300, and a touch driving circuit 400. The touch driving circuit 400 is a component configured to sense a user's touch input and may be referred to as a "touch sensing device".

[0046] The display panel 100 may be formed in a planar shape similar to a quadrilateral. For example, the display panel 100 may have a planar shape similar to a quadrilateral having a pair of short sides extending in a first direction X and a pair of long sides extending in a second direction Y. The corners where the short sides extending in the first direction X and the long sides extending in the second direction Y intersect may be rounded to have a predetermined curvature or may have a right angle shape. The planar shape of the display panel 100 is not necessarily limited to a quadrilateral, and may have a shape similar to other polygons, circles, or ellipses. In addition, the display panel 100 may also be flexible so as to be bent or curved to a significant degree without cracking or otherwise being damaged.

[0047] The display panel 100 may include a main area MA and a sub-area SBA.

[0048] The main area MA may include a display area DA including pixels displaying an image and a non-display area NDA disposed around the display area DA and at least partially surrounding the display area DA. The display area DA may emit light from a plurality of light-emitting areas or a plurality of opening areas. For example, the display panel 100 may include a pixel circuit including a switching element, a pixel defining layer defining a light-emitting area or an opening area, and a self-luminous element.

[0049] The non-display area NDA may be an area outside the display area DA. The non-display area NDA may be defined as an edge area of ​​the main area MA of the display panel 100. The non-display area NDA may include a gate driver supplying a gate signal to a gate line of the display panel 100.

[0050] The sub-area SBA may extend from one side of the main area MA. The sub-area SBA may be bent to overlap the main area MA in the third direction Z. The sub-area SBA may include a pad portion connected to the display driving circuit 200 and the circuit board 300 .

[0051] refer to Figure 2 , the display panel 100 includes a display unit DU and a touch unit TSU.

[0052] The display unit DU may include a plurality of pixels ( Figure 3 Pixel PX is a basic unit for displaying an image on a screen. One pixel PX may include, but is not necessarily limited to, a red sub-pixel, a green sub-pixel, and a blue sub-pixel. A plurality of pixels PX may be alternately arranged in a plan view. For example, the pixels PX may be arranged in a matrix direction, but are not necessarily limited thereto.

[0053] The touch unit TSU may be provided on the display unit DU, but the present disclosure is not necessarily limited thereto. For example, the touch unit TSU may be formed together with the display unit DU using an in-cell touch method. The touch unit TSU may include a plurality of touch electrodes ( Figure 5 SEN in the touch driving circuit 400) and a plurality of touch driving lines ( Figure 5 TL in) and multiple touch sensing lines ( Figure 5 RL in the figure). The touch unit TSU as a layer for identifying touch input may function as a touch member. The touch unit TSU may determine whether a touch input has been made and calculate the touch input coordinates of the corresponding position. Figures 4 to 7 A detailed description of the display unit DU and the touch unit TSU is provided.

[0054] The display unit DU and the touch unit TSU may also overlap each other. For example, the display area DA may be an area where a screen is displayed, and may be an area where a touch input is sensed.

[0055] The sub-area SBA of the display panel 100 may extend from one side of the main area MA. The sub-area SBA may include a flexible material that may be bent, folded, or curled, etc. For example, a portion of the sub-area SBA may be bent at one side of the main area MA, and another portion of the sub-area SBA extending from the bent portion of the sub-area SBA may overlap the main area MA in the third direction Z. The sub-area SBA may include a pad portion connected to the display driving circuit 200 and the circuit board 300.

[0056] refer to Figure 1 , the display driving circuit 200 may be disposed in the sub-area SBA of the display panel 100. In addition, the display driving circuit 200 may be formed as an integrated circuit (IC) and mounted on the display panel 100 by a chip on plastic (COP) method or a chip on glass (COG) method.

[0057] The display driving circuit 200 may output a data signal and a voltage for driving the display panel 100. The display driving circuit 200 may supply a data voltage to a data line of the display panel 100. The display driving circuit 200 may supply a power supply voltage to a power supply line of the display panel 100, and may supply a gate control signal to a gate driver.

[0058] The circuit board 300 may be disposed in the sub area SBA of the display panel 100. Leads of the circuit board 300 may be electrically connected to a pad portion of the display panel 100. The circuit board 300 may be a flexible printed circuit board, a rigid printed circuit board, or a flexible film such as a chip on film.

[0059] The circuit board 300 may include a plurality of conductive lines for transmitting signals from the main circuit board to the display driving circuit 200 or electrically connecting the touch driving circuit 400 to a plurality of first electrodes TE of the touch unit TSU (see Figure 5 ) and a plurality of second electrodes RE (see Figure 5 ).

[0060] In this document, the first electrodes TE may be referred to by terms such as “touch driving electrodes.” In this document, the second electrodes RE may be referred to by terms such as “touch sensing electrodes.”

[0061] The touch driving circuit 400 may be provided in the sub-area SBA of the display panel 100. Alternatively, the touch driving circuit 400 may be mounted on the circuit board 300.

[0062] The touch drive circuit 400 can determine whether a touch input is made and calculate touch coordinates based on sensing the change in capacitance between the plurality of touch electrodes. The touch drive circuit 400 can be formed as an integrated circuit (IC) and mounted on the display panel 100 by a chip on plastic (COP) method or a chip on glass (COG) method.

[0063] Figure 3 is a conceptual diagram of a display unit and a touch driving circuit according to an exemplary embodiment of the present disclosure. Figure 4 is a schematic plan view illustrating a display unit of a display device according to an exemplary embodiment of the present disclosure.

[0064] refer to Figure 3 and Figure 4 , the display device 10 includes a display panel 100 including a plurality of pixels PX, a display driving circuit 200, and a touch driving circuit 400. The display driving circuit 200 and the touch driving circuit 400 may operate based on a control signal or a command signal from a host. For example, the host may be a processor. According to an exemplary embodiment, the touch driving circuit 400 may be controlled by the display driving circuit 200.

[0065] The display driving circuit 200 may include a data driver 230 and a display control unit 220 .

[0066] The display control unit 220 may receive input data R, G, and B and a timing control signal from an external source (e.g., a host). The timing control signal may include a vertical synchronization signal Vsync indicating a frame period, a horizontal synchronization signal Hsync indicating a horizontal period, and a master clock MCLK repeated in a predetermined period. The input data R, G, and B may be RGB data including red image data, green image data, and blue image data. The display control unit 220 may use the received input data R, G, and B and the timing control signal to generate output data signals DR, DG, and DB and internal control signals. The internal control signal includes a data control signal DCS and a gate control signal GCS.

[0067] The display control unit 220 may control the operation of the data driver 230 by providing the data control signal DCS to the data driver 230. The display control unit 220 may control the operation of the gate driver 210 by providing the gate control signal GCS to the gate driver 210.

[0068] The data driver 230 may receive the output data signals DR, DG, and DB and the data control signal DCS from the display control unit 220. The data driver 230 may generate data signals using the received output data signals DR, DG, and DB and the data control signal DCS. The data driver 230 may provide the generated data signals to the display panel 100. The data driver 230 may generate data signals through a plurality of data lines DL1 to DLn (e.g., Figure 4 DL in the figure is used to provide data signals to multiple pixels PX.

[0069] The gate driver 210 may receive a gate control signal GCS from the display control unit 220. The gate driver 210 may generate a gate signal using the received gate control signal GCS. The gate driver 210 may provide the generated gate signal to the display panel 100. The gate driver 210 may generate a gate signal by a plurality of gate lines SL1 to SLm (e.g., Figure 4 GL in the figure is used to provide gate signals to a plurality of pixels PX. Here, m and n are natural numbers greater than 0. Figure 4 A detailed description of the plurality of data lines DL1 to DLn and the plurality of gate lines SL1 to SLm is provided.

[0070] Figure 32 is illustrated that the display driving circuit 200 does not include the gate driver 210, but the present disclosure is not necessarily limited thereto. For example, the gate driver 210 may be included in the display driving circuit 200 that controls the operation of the display panel 100. The gate driver 210, the data driver 230, and the display control unit 220 may be formed as an integrated circuit (IC). The gate driver 210 may be formed during the TFT process of the display panel 100. The display control unit 220 and the data driver 230 may be combined to form a timing controller embedded driver integrated circuit (TED).

[0071] The display panel 100 may include a plurality of data lines ( Figure 4 DL) and multiple gate lines ( Figure 4 Multiple pixels PX of GL) in.

[0072] The frame frequency at which the display driving circuit 200 drives the display panel 100 may be variable. For example, the frame frequency may vary within a range of 1 Hz to 240 Hz depending on the selection of the host or the user. The display driving circuit 200 may be driven at 60 Hz in one cycle, and may change the frame frequency to 120 Hz in another cycle according to the needs of the user.

[0073] The touch sensing area TSA may include a plurality of first electrodes ( Figure 5 TE in) and a plurality of second electrodes ( Figure 5 RE in) and multiple touch drive lines ( Figure 5 TL in) and multiple touch sensing lines ( Figure 5 The touch sensing area TSA may sense a touch input by being applied with an electrical signal Tx from a touch driving circuit 400 provided on the circuit board 300 via a plurality of touch driving lines TL or by transmitting an electrical signal Rx sensed from a plurality of second electrodes RE to the touch driving circuit 400 via a plurality of touch sensing lines RL. For example, the touch driving circuit 400 may sense a touch input by converting an analog electrical signal sensed in the touch sensing area TSA into a digital signal. Figure 5 A detailed description of the touch driving circuit 400 is provided.

[0074] refer to Figure 4 The display unit DU may include a display area DA and a non-display area NDA. The display unit DU may include a plurality of pixels PX and a plurality of gate lines GL and a plurality of data lines DL connected to the plurality of pixels PX.

[0075] The plurality of gate lines GL may supply gate signals received from the gate driver 210 to the plurality of pixels PX. The plurality of gate lines GL may extend in a first direction X, and may be spaced apart from each other in a second direction Y intersecting the first direction X.

[0076] A plurality of data lines DL (eg, Figure 3 The plurality of data lines DL1 to DLn in the display driving circuit 200 may supply a data signal received from the display driving circuit 200 to the plurality of pixels PX. The plurality of data lines DL may extend in the second direction Y and may be spaced apart from each other in the first direction X.

[0077] The non-display area NDA may at least partially surround the display area DA. For example, the non-display area NDA may include a gate signal applied to a plurality of gate lines GL (eg, Figure 3 The display circuit 200 includes a gate driver 210 for connecting the plurality of data lines DL to the display driving circuit 200, a fan-out line FOL connecting the plurality of data lines DL to the display driving circuit 200, and a display pad portion DP connected to the circuit board 300.

[0078] The display driving circuit 200 may supply the gate control signal GCS to the gate driver 210 through the gate control line GCL. The gate driver 210 may generate a plurality of gate signals based on the gate control signal GCS and sequentially supply the plurality of gate signals to the plurality of gate lines GL according to a set order.

[0079] The display driving circuit 200 may supply a first power supply voltage to the first power supply line VL and a second power supply voltage to the second power supply line through the data driver 230. Each of the plurality of pixels PX may be supplied with the first power supply voltage through the first power supply line VL and with the second power supply voltage through the second power supply line. The first power supply voltage may be a predetermined high level voltage, and the second power supply voltage may be a voltage lower than the first power supply voltage.

[0080] The display pad area DPA and the touch pad area TPDA may be disposed at the edge of the display panel 100. The display pad area DPA may include a plurality of display pad portions DP. The plurality of display pad portions DP may be connected to the main processor through the circuit board 300. The plurality of display pad portions DP may be connected to the circuit board 300 to receive digital video data, and the digital video data may be supplied to the display driving circuit 200.

[0081] Figure 5 is a plan view illustrating a touch unit of a display device according to an exemplary embodiment of the present disclosure.

[0082] refer to Figure 5 The touch unit TSU may include a touch sensing area TSA for sensing a user's touch and a touch peripheral area TPA disposed around the touch sensing area TSA. The touch sensing area TSA may overlap with the display area DA of the display panel 100, and the touch peripheral area TPA may overlap with the non-display area NDA of the display panel 100.

[0083] The touch unit TSU may include a plurality of first electrodes TE, a plurality of second electrodes RE, a plurality of touch driving lines TL, and a plurality of touch sensing lines RL.

[0084] The circuit board 300 may include a first circuit pad portion DCPD connected to the display pad portion DP of the display panel 100 , a second circuit pad portion TCPD connected to the touch pad portion TP of the display panel 100 , and a touch circuit line 212 connecting the second circuit pad portion TCPD with the touch driving circuit 400 .

[0085] The touch sensing area TSA includes a plurality of first electrodes TE and a plurality of second electrodes RE as touch electrodes SEN. The plurality of first electrodes TE and the plurality of second electrodes RE may be electrically connected to a touch driving circuit 400 disposed on a circuit board 300. The touch sensing area TSA may be applied with an electrical signal from the touch driving circuit 400 disposed on the circuit board 300 through a plurality of touch driving lines TL, or may transmit electrical signals sensed from the plurality of second electrodes RE to the touch driving circuit 400 through a plurality of touch sensing lines RL.

[0086] The plurality of first electrodes TE may be arranged in the first direction X and the second direction Y. The plurality of first electrodes TE may be spaced apart from each other in the first direction X and the second direction Y. The first electrodes TE adjacent to each other in the second direction Y may be electrically connected to each other through a bridge electrode CE.

[0087] The plurality of first electrodes TE may be connected to the touch pad portion TP through the touch drive line TL. Some of the plurality of touch drive lines TL may extend to the touch pad portion TP via the lower side of the touch peripheral area TPA. Other of the plurality of touch drive lines TL may extend to the touch pad portion TP via the upper side, the left side, and the lower side of the touch peripheral area TPA. The touch pad portion TP may be connected to the touch drive circuit 400 through the circuit board 300.

[0088] The display pad portion DP and the touch pad portion TP may be disposed at an edge of the display panel 100. The display pad portion DP and the touch pad portion TP may be electrically connected to the circuit board 300 using a low-resistance, high-reliability material such as an anisotropic conductive film.

[0089] The plurality of second electrodes RE may extend in the first direction X and may be spaced apart from each other in the second direction Y. The plurality of second electrodes RE may be arranged in the first direction X and the second direction Y, and the plurality of second electrodes RE adjacent to each other in the first direction X may be connected to each other through a connecting portion ( Figure 6 RCE) in are electrically connected to each other.

[0090] The plurality of second electrodes RE may be connected to the touch pad portion TP through the touch sensing lines RL. For example, the plurality of second electrodes RE disposed on the right side of the touch sensing area TSA may be connected to the touch pad portion TP through the plurality of touch sensing lines RL. The plurality of touch sensing lines RL may extend to the touch pad portion TP via the right side and the lower side of the touch peripheral area TPA. The touch pad portion TP may be connected to the touch drive circuit 400 through the circuit board 300.

[0091] Since the plurality of first electrodes TE and the plurality of second electrodes RE include a planar pattern made of a transparent conductive layer or a grid pattern in which an opaque metal is applied along an area where no light emitting element is provided, the plurality of first electrodes TE and the plurality of second electrodes RE may not block the travel of light emitted from the display area DA.

[0092] Touch drive signal ( Fig.10 The touch drive signal TDS in the touch sensing line RL may be applied from the touch drive circuit 400 to a corresponding one of the plurality of first electrodes TE through any one of the plurality of touch drive lines TL. When the touch drive signal TDS is applied to the plurality of first electrodes TE, mutual capacitance may be formed between the first electrodes TE and the second electrodes RE adjacent to each other. When a touch input occurs from the outside, the mutual capacitance value between the first electrodes TE and the second electrodes RE adjacent to each other may change. The change in the mutual capacitance value between the first electrodes TE and the second electrodes RE adjacent to each other may be transmitted to the touch drive circuit 400 through the plurality of touch sensing lines RL. Accordingly, the touch drive circuit 400 may determine whether a touch input has been made and calculate the touch input coordinates of the corresponding position. Touch sensing may be implemented by a mutual capacitance method, but is not necessarily limited thereto.

[0093] This document mainly describes sensing touch by sensing mutual capacitance between the first electrode TE and the second electrode RE, but the present disclosure is not necessarily limited thereto. For example, the touch unit TSU of the present disclosure may sense touch using a self-capacitance method.

[0094] Figure 5 A reference symbol GND not described in the figure may be a ground line formed in the circuit board 300 .

[0095] Figure 5 A reference numeral DME not described in the figure may be a dummy electrode. The plurality of first electrodes TE, the plurality of second electrodes RE, and the plurality of dummy electrodes DME may be disposed on the same layer and may be spaced apart from each other.

[0096] Figure 6 yes Figure 5 An enlarged view of area A1. Figure 7 is an enlarged view illustrating a portion of a display device according to an exemplary embodiment of the present disclosure.

[0097] refer to Figure 6 and Figure 7 , a plurality of first electrodes TE may be arranged in the first direction X and the second direction Y. The plurality of first electrodes TE may be spaced apart from each other in the first direction X and the second direction Y. The first electrodes TE adjacent to each other in the second direction Y may be electrically connected to each other through a bridge electrode CE.

[0098] The plurality of second electrodes RE may extend in the first direction X and may be spaced apart from each other in the second direction Y. The plurality of second electrodes RE may be arranged in the first direction X and the second direction Y, and the second electrodes RE adjacent to each other in the first direction X may be electrically connected to each other through the connection portion RCE. For example, the connection portion RCE of the second electrode RE may cross between the first electrodes TE adjacent to each other.

[0099] A plurality of bridging electrodes CE may be disposed at a layer different from that of the first electrode TE and the second electrode RE. The bridging electrode CE may include a first portion CEa and a second portion CEb. For example, the second portion CEb of the bridging electrode CE may be connected to the first electrode TE disposed on one side through a first contact hole CNT1 and extend in another direction DR2. The first portion CEa of the bridging electrode CE may be bent from the second portion CEb in an area overlapping with the second electrode RE to extend in one direction DR1, and may be connected to the first electrode TE disposed on the other side through a first contact hole CNT1. One direction DR1 may be a direction between the first direction X and the second direction Y, and the other direction DR2 may be a direction intersecting the one direction DR1. For example, each of the plurality of bridging electrodes CE may connect first electrodes TE adjacent to each other in the second direction Y.

[0100] According to an exemplary embodiment, a plurality of first electrodes TE, a plurality of second electrodes RE, and a plurality of dummy electrodes ( Figure 5 The DME in the plan view may be formed in a grid structure or a mesh structure. The plurality of first electrodes TE, the plurality of second electrodes RE and the plurality of dummy electrodes ( Figure 5 The DME in the display device 10 may not overlap with the first to third light emitting areas EA1, EA2, and EA3. The plurality of bridge electrodes CE may not overlap with the first to third light emitting areas EA1, EA2, and EA3. Therefore, the display device 10 can prevent the brightness of light emitted from the first to third light emitting areas EA1, EA2, and EA3 from being reduced due to the touch unit TSU.

[0101] Each of the plurality of first electrodes TE may include a first portion TEa extending in one direction DR1 and a second portion TEb extending in another direction DR2. Each of the plurality of second electrodes RE may include a first portion REa extending in one direction DR1 and a second portion REb extending in another direction DR2.

[0102] According to an exemplary embodiment, a plurality of first electrodes TE, a plurality of second electrodes RE, and a plurality of dummy electrodes ( Figure 5 In this case, the plurality of first electrodes TE, the plurality of second electrodes RE and the plurality of dummy electrodes ( Figure 5 The DME in the embodiment may include a transparent conductive material having high light transmittance such as indium tin oxide (ITO) and indium zinc oxide (IZO).

[0103] The plurality of pixels PX may include first to third sub-pixels, and each of the first to third sub-pixels may include first to third light emitting regions EA1, EA2, and EA3. For example, the first light emitting region EA1 may emit light of a first color or red light, the second light emitting region EA2 may emit light of a second color or green light, and the third light emitting region EA3 may emit light of a third color or blue light, but the present disclosure is not necessarily limited thereto.

[0104] One pixel PX can represent a white grayscale by including one first light emitting area EA1, two second light emitting areas EA2, and one third light emitting area EA3. Therefore, a white grayscale can be represented by combining light emitted from one first light emitting area EA1, light emitted from two second light emitting areas EA2, and light emitted from one third light emitting area EA3.

[0105] Figure 8 is along Figure 7 A cross-sectional view taken along line II'.

[0106] refer to Figure 8 The display panel 100 includes a display unit DU and a touch unit TSU. The display unit DU may include a substrate SUB, a thin film transistor layer TFTL, a light emitting element layer EML, and an encapsulation layer TFEL.

[0107] The substrate SUB may support the display panel 100. The substrate SUB may be a base substrate or a base member and may be made of an insulating material such as a polymer resin. For example, the substrate SUB may be a flexible substrate that can be bent, folded, and / or curled to a significant extent without cracking or otherwise being damaged. As an example, the substrate SUB may include a flexible material and a rigid material.

[0108] The thin film transistor layer TFTL may include first and second buffer layers BF1 and BF2, a thin film transistor TFT, a gate insulating film GI, a first interlayer insulating film ILD1, a capacitor electrode CPE, a second interlayer insulating film ILD2, a first connection electrode CNE1, a first passivation layer PAS1, a second connection electrode CNE2, and a second passivation layer PAS2.

[0109] The first buffer layer BF1 may be disposed on the substrate SUB. The first buffer layer BF1 may include an inorganic film capable of preventing penetration of air or moisture. For example, the first buffer layer BF1 may include a plurality of inorganic films alternately stacked.

[0110] The light blocking layer BML may be disposed on the first buffer layer BF1. For example, the light blocking layer BML may be formed as a single layer or multiple layers made of any one of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), and copper (Cu), or an alloy thereof. As another example, the light blocking layer BML may be an organic film including a black pigment.

[0111] The second buffer layer BF2 may cover the first buffer layer BF1 and the light blocking layer BML. The second buffer layer BF2 may include an inorganic film capable of preventing penetration of air or moisture. For example, the second buffer layer BF2 may include a plurality of inorganic films alternately stacked.

[0112] The thin film transistor TFT may be disposed on the second buffer layer BF2 and may constitute a pixel circuit of each of the plurality of pixels. For example, the thin film transistor TFT may be a driving transistor or a switching transistor of the pixel circuit. The thin film transistor TFT may include a semiconductor region ACT, a gate electrode GE, a source electrode SE, and a drain electrode DE.

[0113] The semiconductor region ACT, the source electrode SE, and the drain electrode DE may be disposed on the second buffer layer BF2. The semiconductor region ACT may overlap with the gate electrode GE in the thickness direction and may be insulated from the gate electrode GE by the gate insulating film GI. The source electrode SE and the drain electrode DE may be formed by making the material of the semiconductor region ACT a conductor.

[0114] The gate electrode GE may be disposed on the gate insulating film GI. The gate electrode GE may overlap with the semiconductor region ACT with the gate insulating film GI interposed therebetween.

[0115] The gate insulating film GI may be disposed on the semiconductor region ACT, the source electrode SE, and the drain electrode DE. For example, the gate insulating film GI may cover the semiconductor region ACT, the source electrode SE, the drain electrode DE, and the second buffer layer BF2, and may insulate the semiconductor region ACT and the gate electrode GE from each other. The gate insulating film GI may include a contact hole through which the first connection electrode CNE1 passes.

[0116] The first interlayer insulating film ILD1 may cover the gate electrode GE and the gate insulating film GI. The first interlayer insulating film ILD1 may include a contact hole through which the first connection electrode CNE1 passes. The contact hole of the first interlayer insulating film ILD1 may be connected to the contact hole of the gate insulating film GI and the contact hole of the second interlayer insulating film ILD2.

[0117] The capacitor electrode CPE may be disposed on the first interlayer insulating film ILD1 . The capacitor electrode CPE may overlap the gate electrode GE in the third direction Z.

[0118] The second interlayer insulating film ILD2 may cover the capacitor electrode CPE and the first interlayer insulating film ILD1. The second interlayer insulating film ILD2 may include a contact hole through which the first connection electrode CNE1 passes. The contact hole of the second interlayer insulating film ILD2 may be connected to the contact hole of the first interlayer insulating film ILD1 and the contact hole of the gate insulating film GI.

[0119] The first connection electrode CNE1 may be disposed on the second interlayer insulating film ILD2. The first connection electrode CNE1 may connect the drain electrode DE of the thin film transistor TFT and the second connection electrode CNE2 to each other. The first connection electrode CNE1 may be inserted into a contact hole formed in the second interlayer insulating film ILD2, the first interlayer insulating film ILD1, and the gate insulating film GI, and contact the drain electrode DE of the thin film transistor TFT.

[0120] The first passivation layer PAS1 may cover the first connection electrode CNE1 and the second interlayer insulating film ILD2. The first passivation layer PAS1 may protect the thin film transistor TFT. The first passivation layer PAS1 may include a contact hole through which the second connection electrode CNE2 passes.

[0121] The second connection electrode CNE2 may be disposed on the first passivation layer PAS1. The second connection electrode CNE2 may connect the first connection electrode CNE1 with the first electrode AND of the light emitting element ED. The second connection electrode CNE2 may be inserted into a contact hole formed in the first passivation layer PAS1 and contact the first connection electrode CNE1.

[0122] The second passivation layer PAS2 may cover the second connection electrode CNE2 and the first passivation layer PAS1. The second passivation layer PAS2 may include a contact hole through which the first electrode AND of the light emitting element ED passes.

[0123] The light emitting element layer EML may be disposed on the thin film transistor layer TFTL. The light emitting element layer EML may include a light emitting element ED and a pixel defining layer PDL. The light emitting element ED may include a first electrode AND, a light emitting layer EL, and a second electrode CAT.

[0124] The first electrode AND may be disposed on the second passivation layer PAS2. The first electrode AND may overlap one of the first to third emission areas EA1, EA2, and EA3 defined by the pixel defining film PDL. The first electrode AND may be connected to the drain electrode DE of the thin film transistor TFT through the first connection electrode CNE1 and the second connection electrode CNE2.

[0125] The light emitting layer EL may be disposed on the first electrode AND. For example, the light emitting layer EL may be an organic light emitting layer made of an organic material, but is not necessarily limited thereto. In the case where the light emitting layer EL corresponds to the organic light emitting layer, when the thin film transistor TFT applies a predetermined voltage to the first electrode AND of the light emitting element ED and the second electrode CAT of the light emitting element ED receives a common voltage or a cathode voltage, holes and electrons may move to the organic light emitting layer EL through the hole transport layer and the electron transport layer, respectively, and the holes and electrons may be recombined with each other in the organic light emitting layer EL to emit light.

[0126] The second electrode CAT may be disposed on the light emitting layer EL. For example, the second electrode CAT may be implemented in the form of an electrode disposed across all pixels without being distinguished for each of the plurality of pixels. For example, the second electrode CAT may be disposed on the light emitting layer EL in the first to third light emitting regions EA1, EA2, and EA3, and may be disposed on the pixel defining film PDL in a region other than the first to third light emitting regions EA1, EA2, and EA3.

[0127] The pixel defining film PDL may define first to third light emitting areas EA1, EA2, and EA3. The pixel defining film PDL may separate and insulate first electrodes AND of the plurality of light emitting elements ED from each other.

[0128] The encapsulation layer TFEL may be disposed on the second electrode CAT to cover the plurality of light emitting elements ED. The encapsulation layer TFEL may include at least one inorganic film to prevent oxygen or moisture from penetrating into the light emitting element layer EML. The encapsulation layer TFEL may include at least one organic film to protect the light emitting element layer EML from foreign matter such as dust.

[0129] The touch unit TSU may be disposed on the encapsulation layer TFEL. The touch unit TSU may include a third buffer layer BF3, a bridge electrode CE, a first insulating layer SIL1, a first electrode TE, a second electrode RE, and a second insulating layer SIL2.

[0130] The third buffer layer BF3 may be disposed on the encapsulation layer TFEL. The third buffer layer BF3 may have an insulating function and an optical function. The third buffer layer BF3 may include at least one inorganic film. Optionally, the third buffer layer BF3 may be omitted.

[0131] The bridge electrode CE may be disposed on the third buffer layer BF3. The bridge electrode CE may be disposed on a different layer from the first electrode TE and the second electrode RE to bridge the gap in the second direction (eg, Figure 7 The bridging electrode CE is connected to the first electrodes TE adjacent to each other in the second direction Y in the direction of the bridge electrode CE. For example, the bridging electrode CE may be formed as a single layer made of molybdenum (Mo), titanium (Ti), copper (Cu) or aluminum (Al), or may be formed as a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and ITO (ITO / Al / ITO), an APC alloy, or a stacked structure of an APC alloy and ITO (ITO / APC / ITO). The APC alloy is an alloy of silver (Ag), palladium (Pd) and copper (Cu).

[0132] The first insulating layer SIL1 may cover the bridge electrode CE and the third buffer layer BF3. The first insulating layer SIL1 may have an insulating function and an optical function. For example, the first insulating layer SIL1 may be formed as an inorganic film, such as a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer.

[0133] The first electrode TE and the second electrode RE may be disposed on the first insulating layer SIL1. Each of the first electrode TE and the second electrode RE may not overlap the first to third light emitting regions EA1, EA2, and EA3. Each of the first electrode TE and the second electrode RE may be formed as a single layer made of molybdenum (Mo), titanium (Ti), copper (Cu), or aluminum (Al), or may be formed as a stack structure of aluminum and titanium (Ti / Al / Ti), a stack structure of aluminum and ITO (ITO / Al / ITO), an APC alloy, or a stack structure of an APC alloy and ITO (ITO / APC / ITO).

[0134] The second insulating layer SIL2 may cover the first electrode TE, the second electrode RE, and the first insulating layer SIL1. The second insulating layer SIL2 may have an insulating function and an optical function. The second insulating layer SIL2 may be formed of the materials exemplified in the first insulating layer SIL1.

[0135] exist Figure 8In the embodiment, the bridge electrode CE is formed on a lower layer of the first electrode TE and the second electrode RE, but the present disclosure is not necessarily limited thereto. For example, the bridge electrode CE may be formed on an upper layer of the first electrode TE and the second electrode RE.

[0136] Fig. 9 is a block diagram schematically illustrating components of a touch unit and a touch driving circuit according to an exemplary embodiment of the present disclosure.

[0137] refer to Fig. 9 , the display device 10 may include a touch unit TSU and a touch driving circuit 400 . Fig. 9 The touch unit TSU shown in the figure is different from the reference Figures 2 to 8 The touch units TSU described are substantially the same. Fig. 9 To the extent that an element is described in detail, it is understood that the element is at least similar to that described elsewhere in the present disclosure (e.g., reference 1 to FIG. 4 ). Figures 2 to 8 ) described above.

[0138] The touch driving circuit 400 includes a driving signal output unit 410, a sensing circuit unit 420, an analog-to-digital conversion unit 430, a touch control unit 440, and a touch data compensation unit 450. In addition, the touch driving circuit 400 may further include a charge pump CP that receives an analog voltage from the outside and boosts the received analog voltage.

[0139] The charge pump CP can generate a touch drive signal ( Fig.10 The charge pump CP generates a first voltage ( Fig.10 V1 in the figure), a second voltage greater than the first voltage V1 ( Fig.10 V2 in the figure), a third voltage greater than the second voltage V2 ( Fig.10 V3 in the figure) and a fourth voltage ( Fig.10 V4 in ) is used as a voltage for generating a touch drive signal TDS.

[0140] The driving signal output unit 410 outputs the touch driving signal TDS to the first electrode TE through the touch driving line TL. The touch driving signal TDS may be a signal in the form of a plurality of pulses.

[0141] The driving signal output unit 410 may output the touch driving signal TDS to the touch driving line TL in a predetermined order. For example, the driving signal output unit 410 may sequentially output the touch driving signal TDS from the first electrode TE of the first column C1 disposed at the leftmost portion of the touch sensing area TSA to the first electrode TE of the fifth column C5 disposed at the rightmost portion of the touch sensing area TSA.

[0142] The sensing circuit unit 420 may be connected to the second electrode RE via the sensing line RL. The sensing circuit unit 420 may sense a charge variation amount of a mutual capacitance of a touch node corresponding to an intersection of the first electrode TE and the second electrode RE through the sensing line RL.

[0143] The sensing circuit unit 420 may include an operational amplifier AFE for sensing the charge variation of the mutual capacitance of the touch node. The operational amplifier AFE may be connected to the sensing line RL in a one-to-one manner. The operational amplifier AFE may amplify raw data input in an analog form.

[0144] The analog-to-digital conversion unit 430 converts each of the output voltages of the operational amplifier AFE of the sensing circuit unit 420 into touch sensing data TD which is digital data.

[0145] The touch control unit 440 controls the driving timing of the driving signal output unit 410, the sensing circuit unit 420, and the analog-to-digital conversion unit 430. The touch control unit 440 may output a timing signal for synchronizing the driving signal output unit 410, the sensing circuit unit 420, and the analog-to-digital conversion unit 430 to each of the driving signal output unit 410, the sensing circuit unit 420, and the analog-to-digital conversion unit 430.

[0146] The touch control unit 440 sets the swing and voltage level of the touch drive signal TDS based on the control signal of the display drive circuit 200. The touch control unit 440 causes the voltage level of the touch drive signal TDS to rise during the rising edge period and then quickly fall. In addition, the touch control unit 440 causes the voltage level of the touch drive signal TDS to fall during the falling edge period and then quickly rise. This is to minimize the noise that affects the display panel during the rising edge period and the falling edge period of the touch drive signal TDS. This will be referred to later. Fig.10 The characteristics of the touch drive signal TDS will be described in detail.

[0147] The touch data compensation unit 450 receives touch sensing data TD sensed from all touch nodes in the touch sensing area TSA from the analog-to-digital conversion unit 430. The touch data compensation unit 450 analyzes the touch sensing data TD, calculates a touch area ratio, and compensates the touch sensing data TD according to the touch area ratio.

[0148] Fig.10 is a waveform diagram illustrating a touch drive signal TDS according to an exemplary embodiment of the present disclosure. For example, Fig.10 FIG. 1 shows driving waveforms of a horizontal synchronization signal Hsync and a touch driving signal TDS.

[0149] According to an exemplary embodiment, the touch control unit 440 sets the touch driving signal TDS to swing between a first voltage V1 and a second voltage V2 which is higher than the first voltage V1.

[0150] The touch control unit 440 sets a period for outputting the touch driving signal TDS as follows.

[0151] The time period for outputting the touch drive signal TDS includes: a rising edge period P1 (for example, a first period) in which the touch drive signal TDS rises from the first voltage V1 to the third voltage V3 and then drops from the third voltage V3 to the second voltage V2; a high level period P2 (for example, a second period) in which the touch drive signal TDS maintains the second voltage V2; a falling edge period P3 (for example, a third period) in which the touch drive signal TDS drops from the second voltage V2 to the fourth voltage V4 and then rises from the fourth voltage V4 to the first voltage V1; and a low level period P4 (for example, a fourth period) in which the touch drive signal TDS maintains the first voltage V1.

[0152] During the rising edge period P1 in which the touch drive signal TDS rises from the first voltage V1 to the second voltage V2, the touch control unit 440 sets the touch drive signal TDS to rise to a third voltage V3 higher than the second voltage V2 and then drop from the third voltage V3 to the second voltage V2. For example, during the rising edge period P1, the touch drive signal TDS rises from about 0V to about 5V and then drops to about 4V. In an exemplary embodiment, by rapidly reducing the voltage level of the touch drive signal TDS that rises during the rising edge period P1 by a predetermined level, the noise influence 1001 of the touch drive signal TDS on the display screen of the display panel 100 can be reduced.

[0153] During the falling edge period P3 in which the touch drive signal TDS falls from the second voltage V2 to the first voltage V1, the touch control unit 440 sets the touch drive signal TDS to fall to a fourth voltage V4 lower than the first voltage V1 and then rise from the fourth voltage V4 to the first voltage V1. For example, during the falling edge period P3, the touch drive signal TDS falls from about 4V to about -1V and then rises to about 0V. In an exemplary embodiment, by rapidly raising the voltage level of the touch drive signal TDS that falls during the falling edge period P3 to a predetermined level, the noise influence 1002 of the touch drive signal TDS on the display screen of the display panel 100 can be reduced.

[0154] According to an exemplary embodiment, the length of the rising edge period P1 is shorter than the length of the high level period P2. For example, the length of the period in which the touch drive signal TDS rises from about 0V to about 5V and then drops to about 4V is shorter than the length of the period in which the touch drive signal TDS maintains about 4V thereafter.

[0155] According to an exemplary embodiment, the length of the falling edge period P3 is shorter than the length of the low level period P4. For example, the length of the period in which the touch drive signal TDS drops from about 4V to about -1V and then rises to about 0V is shorter than the length of the period in which the touch drive signal TDS maintains about 0V thereafter.

[0156] According to an exemplary embodiment, the length of the high level period P2 is the same as the length of the low level period P4. For example, the period during which the touch driving signal TDS maintains about 4V after the rising edge period P1 may be the same as the period during which the touch driving signal TDS maintains about 0V after the falling edge period P3.

[0157] According to an exemplary embodiment, the touch control unit 440 sets the first voltage difference d1 between the third voltage V3 and the second voltage V2 to about 30% of the second voltage difference d2 between the first voltage V1 and the third voltage V3. For example, when the touch drive signal TDS rises by 10V from about 0V to about 10V during the rising edge period P1, the touch drive signal TDS may drop by about 3V (corresponding to about 30% of 10V) and then drop to about 7V.

[0158] According to an exemplary embodiment, the touch control unit 440 sets the third voltage difference d3 between the fourth voltage V4 and the first voltage V1 to about 30% of the fourth voltage difference d4 between the second voltage V2 and the fourth voltage V4. For example, when the touch drive signal TDS drops by 10V from about 10V to about 0V during the falling edge period P3, the touch drive signal TDS may rise by about 3V (corresponding to about 30% of 10V) and then rise to about 3V.

[0159] According to an exemplary embodiment, the touch control unit 440 sets the first voltage difference d1 and the third voltage difference d3 to be the same. For example, the touch control unit 440 sets the first voltage difference d1 and the third voltage difference d3 to be the same, the first voltage difference d1 being a decrease amount by which the touch drive signal TDS rises during the rising edge period P1 and then falls, and the third voltage difference d3 being an increase amount by which the touch drive signal TDS falls during the falling edge period P3 and then rises.

[0160] The exemplary embodiments of the present disclosure have been described above with reference to the accompanying drawings, but a person skilled in the art to which the present disclosure pertains will appreciate that various modifications and changes may be made without departing from the technical essential features of the present disclosure.

[0161] At the conclusion of the detailed description, those skilled in the art will appreciate that numerous variations and modifications may be made to the embodiments discussed herein without substantially departing from the principles of the invention.

Claims

1. A display device, comprising: A display panel including touch electrodes; as well as a touch driving circuit, comprising a driving signal output unit configured to output a touch driving signal supplied to the touch electrode and a touch control unit configured to control the driving signal output unit, Wherein, the touch control unit is configured as follows: The touch drive signal is set to swing between a first voltage and a second voltage higher than the first voltage, During a rising edge period of the touch drive signal rising from the first voltage to the second voltage, the touch drive signal is set to rise to a third voltage higher than the second voltage and then fall from the third voltage to the second voltage, and During a falling edge period in which the touch drive signal falls from the second voltage to the first voltage, the touch drive signal is set to fall to a fourth voltage lower than the first voltage and then rise from the fourth voltage to the first voltage.

2. The display device according to claim 1, wherein: The time period for outputting the touch drive signal includes: the rising edge period, during which the touch drive signal rises from the first voltage to the third voltage and then drops from the third voltage to the second voltage; a high level period, during which the touch drive signal maintains the second voltage; the falling edge period, during which the touch drive signal drops from the second voltage to the fourth voltage and then rises from the fourth voltage to the first voltage; and A low level period, during which the touch driving signal maintains the first voltage.

3. The display device according to claim 2, wherein: The length of the rising edge period is shorter than the length of the high level period.

4. The display device according to claim 2, wherein: The length of the falling edge period is shorter than the length of the low level period.

5. The display device according to claim 2, wherein: The length of the high level period is the same as the length of the low level period.

6. The display device according to claim 1, wherein: The touch control unit is configured to set a first voltage difference between the third voltage and the second voltage to 30% of a second voltage difference between the first voltage and the third voltage.

7. The display device according to claim 6, wherein: The touch control unit is configured to set a third voltage difference between the fourth voltage and the first voltage to 30% of a fourth voltage difference between the second voltage and the fourth voltage.

8. The display device according to claim 7, wherein: The touch control unit is configured to set the first voltage difference and the third voltage difference to be the same.

9. The display device according to claim 1, wherein: The touch driving circuit further comprises: A charge pump is configured to generate the first voltage, the second voltage, the third voltage and the fourth voltage.

10. The display device according to any one of claims 1 to 9, wherein: The touch electrodes are configured to capacitively sense touch.

11. A mobile electronic device, comprising: A display panel including touch electrodes; as well as a touch driving circuit, comprising a driving signal output unit configured to output a touch driving signal supplied to the touch electrode and a touch control unit configured to control the driving signal output unit, Wherein, the touch control unit is configured as follows: The touch drive signal is set to swing between a first voltage and a second voltage higher than the first voltage, During a rising edge period of the touch drive signal rising from the first voltage to the second voltage, the touch drive signal is set to rise to a third voltage higher than the second voltage and then fall from the third voltage to the second voltage, and During a falling edge period in which the touch drive signal falls from the second voltage to the first voltage, the touch drive signal is set to fall to a fourth voltage lower than the first voltage and then rise from the fourth voltage to the first voltage.

12. The mobile electronic device according to claim 11, wherein: The time period for outputting the touch drive signal includes: the rising edge period, during which the touch drive signal rises from the first voltage to the third voltage and then drops from the third voltage to the second voltage; a high level period, during which the touch drive signal maintains the second voltage; the falling edge period, during which the touch drive signal drops from the second voltage to the fourth voltage and then rises from the fourth voltage to the first voltage; and A low level period, during which the touch driving signal maintains the first voltage.

13. The mobile electronic device according to claim 12, wherein: The length of the rising edge period is shorter than the length of the high level period.

14. The mobile electronic device according to claim 12, wherein: The length of the falling edge period is shorter than the length of the low level period.

15. The mobile electronic device according to claim 12, wherein: The length of the high level period is the same as the length of the low level period.

16. The mobile electronic device according to claim 11, wherein: The touch control unit is configured to set a first voltage difference between the third voltage and the second voltage to 30% of a second voltage difference between the first voltage and the third voltage.

17. The mobile electronic device according to claim 16, wherein: The touch control unit is configured to set a third voltage difference between the fourth voltage and the first voltage to 30% of a fourth voltage difference between the second voltage and the fourth voltage.

18. The mobile electronic device according to claim 17, wherein: The touch control unit is configured to set the first voltage difference and the third voltage difference to be the same.

19. The mobile electronic device according to claim 11, wherein: The touch driving circuit further comprises: A charge pump is configured to generate the first voltage, the second voltage, the third voltage and the fourth voltage.

20. The mobile electronic device according to any one of claims 11 to 19, wherein: The touch electrodes are configured to capacitively sense touch.

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