Touch detection module and display device including the same

Abstract

The invention relates to a touch detection module and a display device. The touch detection module includes a touch sensing unit and a touch driving circuit. The touch sensing unit includes a touch electrode and an inspection signal transmission line. A touch electrode in a touch sensing area of the touch sensing unit is connected to a touch line extending through a touch peripheral area of the touch sensing unit. The touch driving circuit provides an inspection signal to the inspection signal transmission line, and provides a touch driving signal to the touch electrode. The provided touch driving signal depends on a voltage amplitude or a current amount of the inspection signal, and wherein the touch driving circuit provides the touch driving signal to the touch electrode and detects a touch sensing signal from the touch electrode to detect coordinates of the touch position.

Description

Technical Field

[0001] The present disclosure relates to a touch detection module and a display device including the touch detection module. Background Art

[0002] The progress towards an information society has placed increasing demands on display devices that display images for various purposes and in various ways. For example, display devices have been applied to various electronic devices such as smart phones, digital cameras, laptop computers, navigation systems, and smart TVs.

[0003] The display device may be a flat panel display device such as a liquid crystal display device, a field emission display device, or an organic light emitting display device. Among flat panel display devices, each of the pixels in the display panel of the light emitting display device generally includes a light emitting element capable of emitting light, allowing an image to be displayed without a backlight unit that supplies light to the display panel.

[0004] Modern display devices may include a touch detection module for sensing a user's touch as an input interface. The touch detection module may include a touch sensing unit including touch electrodes and a touch driving circuit capable of detecting the amount of electric charge in the capacitance between the touch electrodes. The touch detection module may be integrally formed on the image display unit of the display device, or may be separately manufactured and then mounted on the front surface of the image display unit. Summary of the Invention

[0005] Aspects of the present disclosure may provide a touch detection module capable of detecting manufacturing process deviations and electrical signal transmission deviations of each touch sensor and a display panel in real time, and may provide a display device including the touch detection module.

[0006] Aspects of the present disclosure may also provide a touch detection module capable of changing and applying in real time the voltage amplitude and the amount of electric current of a touch driving signal supplied to touch electrodes in response to manufacturing process deviations and electrical signal transmission deviations, and may provide a display device including the touch detection module.

[0007] Aspects of the present disclosure are not limited to those set forth herein. By referring to the following detailed description of the present disclosure, the above and other aspects of the present disclosure will become more apparent to those of ordinary skill in the art to which the present disclosure pertains.

[0008] According to an embodiment of the present disclosure, the touch detection module includes a touch sensing unit and a touch driving circuit. The touch electrodes are in the touch sensing region and are connected to touch lines extending through the touch peripheral region. The touch driving circuit provides a check signal to the check signal transmission line and changes the voltage amplitude or current amount of the touch driving signal according to a change in the voltage amplitude or current amount of the check signal, wherein the touch driving circuit provides the touch driving signal with the changed voltage amplitude or current amount to the touch electrodes and detects the touch sensing signal from the touch electrodes to detect the coordinates of the touch position.

[0009] According to an embodiment of the present disclosure, a display device includes: a display panel including a display region in which a plurality of sub-pixels are arranged; and a touch detection module on the display panel and configured to sense a user's touch. The touch detection module includes a touch sensing unit including touch electrodes and a check signal transmission line. The touch electrodes are in the touch sensing region of the touch sensing unit and are connected to touch lines extending through the touch peripheral region of the touch sensing unit. The touch driving circuit provides a check signal to the check signal transmission line and changes the current amount or voltage amplitude of the touch driving signal according to a change in the current amount or voltage amplitude of the check signal. The touch driving circuit provides the touch driving signal with the changed voltage amplitude or current amount to the touch electrodes and detects the touch sensing signal from the touch electrodes to detect the coordinates of the touch position.

[0010] The touch detection module according to an embodiment of the present disclosure and the display device including the touch detection module can improve the touch sensing performance by varying the supply characteristics of the touch driving signal according to the manufacturing process deviation and the electrical signal transmission deviation of each touch sensing unit and the display panel.

[0011] In addition, by changing and applying in real time the voltage amplitude and current amount of the touch driving signal in response to the manufacturing process deviation and the electrical signal transmission deviation of each touch sensing unit and the display panel, the defect rate can be reduced and the manufacturing yield can be increased.

[0012] The effects of the embodiments are not limited to those described herein. By referring to the claims, the above and other effects of the embodiments will become more apparent to those of ordinary skill in the art to which the embodiments pertain. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a perspective view showing a display device according to an embodiment of the present disclosure.

[0014] Figure 2 is a plan view showing a display device according to an embodiment of the present disclosure.

[0015] Figure 3is a side view showing a display device according to an embodiment of the present disclosure.

[0016] Figure 4 is a layout diagram showing an example of the layout of the display panel shown Figures 1 to 3 therein.

[0017] Figure 5 is a layout diagram schematically showing a first embodiment of the touch sensing unit shown Figure 3 therein.

[0018] Figure 6 is a layout diagram schematically showing a second embodiment of the touch sensing unit shown Figure 3 therein.

[0019] Figure 7 is a layout diagram schematically showing a third embodiment of the touch sensing unit shown Figure 3 therein.

[0020] Figure 8 is a layout diagram schematically showing a fourth embodiment of the touch sensing unit shown Figure 3 therein.

[0021] Figure 9 is a block diagram schematically showing a first embodiment of the configuration of the touch driving circuit for Figures 1 to 3 that shown therein.

[0022] Figure 10 is a block diagram schematically showing a second embodiment of the configuration of the touch driving circuit for Figures 1 to 3 that shown therein;

[0023] Figure 11 and Figure 12 is a perspective view showing a display device according to another embodiment of the present disclosure.

[0024] Figure 13 and Figure 14 is a perspective view showing a display device according to yet another embodiment of the present disclosure. DETAILED DESCRIPTION

[0025] Hereinafter, some embodiments of the present disclosure will be described more fully with reference to the accompanying drawings. However, the present disclosure may be implemented in different forms and should not be construed as 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 disclosure to those skilled in the art.

[0026] Hereinafter, a layer referred to as being "on" another layer or substrate may be directly on the other layer or substrate, or there may also be an intervening layer.

[0027] The terms "first", "second", etc. may be used herein to describe various elements, but these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the teachings of the present disclosure, the first element discussed below may be referred to as the second element. Similarly, the second element may also be referred to as the first element.

[0028] Each of the features of the various embodiments of the present disclosure can be partially or wholly combined with each other, and various interlocks and drives of the features are possible. Each embodiment can be implemented independently of other embodiments, or multiple embodiments can be implemented together in association.

[0029] Specific embodiments are described below with reference to the accompanying drawings. The same reference numerals used in the respective drawings and throughout the specification indicate the same or corresponding components.

[0030] Figure 1 is a perspective view showing a display device according to an embodiment of the present disclosure. Figure 2 is showing Figure 1 a plan view of the display device in an unbent state, and Figure 3 is showing Figure 1 a side view of the display device in a bent state.

[0031] Referring to Figures 1 to 3 , the display device 10 according to an embodiment can be applied to portable electronic devices such as mobile phones, smart phones, tablet personal computers, mobile communication terminals, electronic notebooks, e-books, portable multimedia players (PMPs), navigation systems, ultra-mobile personal computers (UMPCs), etc. In addition, the display device 10 can be used as a display unit for a television, a laptop computer, a monitor, a billboard, or an Internet of Things (IoT) terminal. In addition, the display device 10 can be applied to wearable devices such as smart watches, watch phones, glasses-type displays, or head-mounted displays (HMDs). Optionally, the display device 10 can be applied to the instrument panel of a vehicle, the central instrument panel of a vehicle, a central information display (CID) provided on the instrument panel of a vehicle, an in-vehicle mirror display replacing the side view mirror of a vehicle, or a display for rear seat entertainment of a vehicle provided on the rear surface of the front seat.

[0032] The display device 10 according to an embodiment can be a light-emitting display device such as an organic light-emitting display device using organic light-emitting diodes, a quantum dot light-emitting display including a quantum dot light-emitting layer, an inorganic light-emitting display including an inorganic semiconductor in a light-emitting diode, or a micro light-emitting display using micro light-emitting diodes or nano light-emitting diodes. The following description focuses on the embodiment in which the display device 10 is an organic light-emitting display device, but the present disclosure is not limited thereto.

[0033] The display device 10 according to one embodiment includes a display panel 100 including a display module DU, a display driving circuit 200, a circuit board 300, a touch sensing unit TSU, and a touch driving circuit 400. In an embodiment, the touch sensing unit TSU and the touch driving circuit 400 may be included in a touch detection module.

[0034] The display panel 100 may have a rectangular shape that has a short side extending in a first direction (X-axis direction) and a long side extending in a second direction (Y-axis direction) crossing the first direction (X-axis direction) in a plan view. Each corner where the short side and the long side meet may be rounded to have a predetermined curvature, or may be a right angle. The planar shape of the display panel 100 is not limited to a rectangular shape, and the display panel 100 may be formed in another polygon shape, a circular shape, an oval shape, or any other desired shape. The display panel 100 may be flat, but is not limited thereto. For example, the display panel 100 may include curved portions formed at the left and right ends and having a constant curvature or a varying curvature. In addition, the display panel 100 may be flexible such that the display panel 100 can be bent, folded, or curled.

[0035] The display panel 100 includes a main area MA and a sub-area SBA.

[0036] The main area MA includes a display area DA for displaying an image and a non-display area NDA that is a peripheral area of the display area DA. The display area DA includes pixels for displaying an image. The sub-area SBA may protrude from one side of the main area MA in the second direction (Y-axis direction).

[0037] Figure 1 and Figure 2 The unfolded sub-area SBA is shown, but the sub-area SBA may be bent as shown in Figure 3 , and in this case, at least a part of the sub-area SBA may be disposed on the lower surface of the display panel 100. When the sub-area SBA is bent, the sub-area SBA may overlap the main area MA in a third direction (Z-axis direction) that is the thickness direction of the substrate SUB. The display driving circuit 200 may be disposed in the sub-area SBA.

[0038] The display panel 100 includes a display module DU. As shown in Figure 3 , the display module DU may include a substrate SUB, a thin film transistor layer TFTL, a light emitting element layer EML, and a packaging layer TFEL, and the touch sensing unit TSU may be formed on the front surface of the display module DU.

[0039] The thin film transistor layer TFTL may be disposed on the substrate SUB. The thin film transistor layer TFTL may be disposed in the main area MA and the sub-area SBA. The thin film transistor layer TFTL includes thin film transistors.

[0040] The light emitting element layer EML may be disposed on the thin film transistor layer TFTL. The light emitting element layer EML may be disposed in the display area DA of the main area MA. The light emitting element layer EML includes light emitting elements disposed in the light emitting part of the display module DU.

[0041] The encapsulation layer TFEL may be disposed on the light emitting element layer EML. The encapsulation layer TFEL may be disposed in the display area DA and the non-display area NDA of the main area MA. The encapsulation layer TFEL may include at least one inorganic layer and at least one organic layer for encapsulating the light emitting element layer EML.

[0042] The touch sensing unit TSU may be integrally formed on the front surface of the encapsulation layer TFEL with the encapsulation layer TFEL, or may be separately manufactured and then mounted on the front surface of the encapsulation layer TFEL. The touch sensing unit TSU may be particularly disposed in the display area DA of the main area MA. The touch sensing unit TSU may use touch electrodes to detect the touch of an electronic pen and / or the touch of a human body part such as a finger. Specifically, the touch sensing unit TSU may use touch electrodes and a capacitance detection method or a voltage amplitude change detection method to detect the touch and identify the touch position.

[0043] At least one inspection signal transmission line for detecting manufacturing process deviations during the manufacture of the display panel 100 and the touch sensing unit TSU may be formed in the touch sensing unit TSU. At least one inspection signal transmission line may be formed in the same process layer having the same metal material as at least one touch electrode or at least one touch line through the same process. At least one inspection signal transmission line may be formed in a region corresponding to the non-display area NDA or the sub-area SBA. In addition, at least one inspection signal transmission line may be formed to straddle both the display area DA and the non-display area NDA.

[0044] A cover window for protecting the upper part of the display panel 100 may be disposed on the touch sensing unit TSU. The cover window may be attached to the touch sensing unit TSU through a transparent adhesive member such as an optically clear adhesive (OCA) layer or an optically clear resin (OCR) layer. The cover window may also be made of an inorganic material such as glass or an organic material such as a plastic or polymer material. A polarization layer may be added between the touch sensing unit TSU and the cover window to prevent deterioration of image visibility due to reflection of external light.

[0045] The display driving circuit 200 may generate signals and voltages for driving the display panel 100. The display driving circuit 200 may be an integrated circuit (IC) attached to the display panel 100 in a chip on glass (COG) manner, a chip on plastic (COP) manner, or an ultrasonic bonding manner, but is not limited thereto according to an embodiment of the present disclosure. For example, the display driving circuit 200 may be attached to the circuit board 300 by a chip on film (COF) method.

[0046] The circuit board 300 may be attached to one end of the sub-region SBA of the display panel 100 and may be electrically connected to the display panel 100 and the display driving circuit 200. The display panel 100 and the display driving circuit 200 may receive digital video data, timing signals, and driving voltages through the circuit board 300. The circuit board 300 may be a flexible film such as a flexible printed circuit board, a printed circuit board, or a chip on film.

[0047] The touch driving circuit 400 may be disposed on the circuit board 300. The touch driving circuit 400 may be an integrated circuit (IC) attached to the circuit board 300.

[0048] The touch driving circuit 400 is electrically connected to the touch electrodes of the touch sensing unit TSU. In addition, the touch driving circuit 400 is electrically connected to at least one inspection signal transmission line formed in the touch sensing unit TSU for detecting manufacturing process deviations in the display panel 100 and the touch sensing unit TSU.

[0049] The touch driving circuit 400 provides an electrical inspection signal to the inspection signal transmission line formed in the touch sensing unit TSU to detect manufacturing process deviations in the display panel 100 and the touch sensing unit TSU. The touch driving circuit 400 may provide the inspection signal to the inspection signal transmission line in real time or for each preset period. Then, a change in the voltage amplitude or current amount of the inspection signal may be detected in real time or for each preset period. The change in the voltage amplitude or current amount of the inspection signal may be detected differently according to the manufacturing process deviation of each of the display panel 100 and the touch sensing unit TSU. The change in the voltage amplitude or current amount of the inspection signal may be detected differently according to usage conditions such as the usage environment and usage time of the display panel 100 and the touch sensing unit TSU. The touch driving circuit 400 may change the voltage amplitude or current amount of the touch driving signal provided to the touch electrodes to correspond to the change in the voltage amplitude or current amount of the inspection signal.

[0050] The touch driving circuit 400 can apply a touch driving signal with a changed voltage amplitude or current amount to the touch electrodes of the touch sensing unit TSU, and the touch can be sensed by measuring the change in the amount of charge of the mutual capacitance of each of the plurality of touch nodes formed by the touch electrodes. Specifically, the touch driving circuit 400 provides a touch driving signal to the touch electrodes in the touch sensing unit TSU, and measures the change in the capacitance between the touch nodes according to the change in the voltage amplitude or current amount of the touch sensing signal received through the touch electrodes. In this way, the touch driving circuit 400 can determine whether a user's touch has occurred, whether the user is approaching, etc. based on the change in the amount of charge of the mutual capacitance of each of the touch nodes.

[0051] Optionally, the touch driving circuit 400 can provide a touch driving signal to the touch electrodes in the touch sensing unit TSU simultaneously or sequentially, and can detect the change in the voltage amplitude or current amount of the touch sensing signal received through the touch electrodes. In this way, the touch driving circuit 400 can detect whether the user has touched the device, and can calculate the coordinates of the touch position by detecting the change in the voltage amplitude or current amount of the touch sensing signal received through each touch electrode.

[0052] The user's touch indicates that the user's finger or an object such as a pen is in direct contact with one surface of the cover window provided on the touch sensing unit TSU. The user's approach indicates that the user's finger or an object such as a pen hovers above one surface of the cover window.

[0053] The display driving circuit 200 can operate as a main processor, or can be integrally formed with the main processor. Therefore, the display driving circuit 200 can control the overall functions of the display device 10. For example, the display driving circuit 200 can receive touch data from the touch driving circuit 400, determine the touch coordinates of the user, and then generate digital video data according to the touch coordinates. In addition, the display driving circuit 200 can execute the application indicated by the icon displayed at the touch coordinates of the user. As another example, the display driving circuit 200 can receive coordinate data from an electronic pen or the like, determine the touch coordinates of the electronic pen, and then generate digital video data according to the touch coordinates, or can also execute the application indicated by the icon displayed at the touch coordinates of the electronic pen.

[0054] Figure 4 Shows Figures 1 to 3 An example of the layout of the display panel shown in. Specifically, Figure 4 Is a layout diagram showing the display area DA and the non-display area NDA of the display module DU before the touch sensing unit TSU is formed.

[0055] The display area DA, which is the area for displaying an image, may be the central area of the display panel 100. The display area DA may include a plurality of pixels SP, a plurality of gate lines GL, a plurality of data lines DL, and a plurality of voltage lines VL. Each of the plurality of pixels SP may be defined as the smallest unit for outputting light.

[0056] The plurality of gate lines GL may supply gate signals received from the gate driver 201 to the plurality of pixels SP. The plurality of gate lines GL may extend in the X-axis direction and may be spaced apart from each other in the Y-axis direction that intersects the X-axis direction.

[0057] The plurality of data lines DL may supply data voltages received from the display driving circuit 200 to the plurality of pixels SP. The plurality of data lines DL may extend in the Y-axis direction and may be spaced apart from each other in the X-axis direction.

[0058] The plurality of voltage lines VL may supply power supply voltages received from the display driving circuit 200 to the plurality of pixels SP. The power supply voltage may be at least one of a driving voltage, an initialization voltage, and a reference voltage. The plurality of voltage lines VL may extend in the Y-axis direction and may be spaced apart from each other in the X-axis direction.

[0059] The non-display area NDA may surround the display area DA. The non-display area NDA may include the gate driver 201, the fan-out line FOL, and the gate control line GCL. The gate driver 201 may generate a plurality of gate signals based on a gate control signal and may supply the plurality of gate signals to the plurality of gate lines GL in a predetermined order sequentially.

[0060] The fan-out line FOL may extend from the display driving circuit 200 to the display area DA. The fan-out line FOL may supply data voltages received from the display driving circuit 200 to the plurality of data lines DL.

[0061] The gate control line GCL may extend from the display driving circuit 200 to the gate driver 201. The gate control line GCL may supply the gate control signal received from the display driving circuit 200 to the gate driver 201.

[0062] The sub-area SBA may include the display driving circuit 200, the display pad area DPA, and the first touch pad area TPA1 and the second touch pad area TPA2.

[0063] The display driving circuit 200 may output signals and voltages for driving the display panel 100 to the fan-out line FOL. The display driving circuit 200 may supply data voltages to the data lines DL through the fan-out line FOL. The data voltages may be applied to the plurality of pixels SP and may control the brightness of the plurality of pixels SP. The display driving circuit 200 may supply the gate control signal received from the display driving circuit 200 to the gate driver 201 through the gate control line GCL.

[0064] The display pad region DPA, the first touch pad region TPA1, and the second touch pad region TPA2 may be provided on or near the edge of the sub-region SBA. The display pad region DPA, the first touch pad region TPA1, and the second touch pad region TPA2 may be electrically connected to the circuit board 300 using low-resistance and high-reliability materials such as anisotropic conductive layers and SAP.

[0065] The display pad region DPA may include a plurality of display pads DP. The plurality of display pads DP may be connected to the display driving circuit 200 or connected to the touch driving circuit 400 through the circuit board 300. The plurality of display pads DP may be connected to the circuit board 300 to receive digital video data and may provide the digital video data to the display driving circuit 200.

[0066] Figure 5 is schematically shown Figure 3 a layout diagram of a first embodiment of the touch sensing unit shown in

[0067] Refer to Figure 5 , the touch electrodes SE of the touch sensing unit TSU are divided into two types of electrodes, such as driving electrodes TE and sensing electrodes RE. Mutual capacitance sensing may be performed by applying a touch driving signal to the driving electrode TE and then sensing the change amount of the mutual capacitance of each of the touch nodes TN through the sensing electrode RE. It should be noted that the type and arrangement structure of the touch electrodes SE and the method of driving the touch electrodes SE are not limited to mutual capacitance sensing.

[0068] For ease of explanation, Figure 5 only the driving electrode TE, the sensing electrode RE, the dummy pattern DE, the touch line SL, at least one inspection signal transmission line IVL, and the first touch pad TP1 and the second touch pad TP2 are shown.

[0069] Refer to Figure 5 , the touch sensing unit TSU includes a touch sensing area TSA for sensing a user's touch and a touch peripheral area TPA provided around the touch sensing area TSA. The touch sensing area TSA may overlap with Figures 1 to 3 the display area DA of

[0070] the driving electrode TE, the sensing electrode RE, and the dummy pattern DE are provided in the touch sensing area TSA. The driving electrode TE and the sensing electrode RE may be electrodes for forming a mutual capacitance to sense the touch of a stylus or a person.

[0071] The driving electrodes TE can be arranged in a first direction (X-axis direction) and a second direction (Y-axis direction). The driving electrodes TE adjacent to each other in the first direction (X-axis direction) are electrically separated from each other, while the driving electrodes TE adjacent to each other in the second direction (Y-axis direction) are electrically connected to each other. The driving electrodes TE adjacent to each other in the second direction (Y-axis direction) can be connected by separate connection electrodes.

[0072] The sensing electrodes RE can be arranged in a first direction (X-axis direction) and a second direction (Y-axis direction). The sensing electrodes RE adjacent to each other in the first direction (X-axis direction) can be electrically connected to each other. The sensing electrodes RE adjacent to each other in the second direction (Y-axis direction) can be electrically separated from each other. Thus, the touch nodes TN forming mutual capacitance can be at the intersections of the driving electrodes TE and the sensing electrodes RE. A plurality of touch nodes TN can be associated with the intersections of the driving electrodes TE and the sensing electrodes RE.

[0073] Each of the dummy patterns DE can be surrounded by a corresponding one of the driving electrodes TE or the sensing electrodes RE. Each of the dummy patterns DE can be electrically separated from the surrounding driving electrodes TE or the surrounding sensing electrodes RE. Each of the dummy patterns DE can be spaced apart from the surrounding driving electrodes TE or the surrounding sensing electrodes RE. Each of the dummy patterns DE can be electrically floating.

[0074] In Figure 5 , when viewed from the top, each of the driving electrodes TE, the sensing electrodes RE, and the dummy patterns DE has a rhombic shape, but the present disclosure is not limited thereto. For example, when viewed from the top, each of the driving electrodes TE, the sensing electrodes RE, and the dummy patterns DE can have a quadrilateral shape other than a rhombus, a polygonal shape other than a quadrilateral shape, a circular shape, or an elliptical shape.

[0075] Touch lines SL and at least one inspection signal transmission line IVL can be provided around the touch sensing area TSA, that is, in the touch peripheral area TPA.

[0076] The touch lines SL include a first touch driving line TL1 and a second touch driving line TL2 connected to the driving electrodes TE and a touch sensing line RL connected to the sensing electrodes RE.

[0077] The sensing electrodes RE provided at one edge of the touch sensing area TSA can be respectively connected to the touch sensing line RL. For example, as Figure 5As shown, the sensing electrodes RE disposed at the right edge can be directly connected to the touch sensing lines RL respectively, and these sensing electrodes RE are electrically connected to other sensing electrodes RE along the first direction (X-axis direction). Each of the touch sensing lines RL can extend through the touch peripheral area TPA to be connected to the pads in the pad unit PD. For example, the touch sensing lines RL can extend around the right side of the touch sensing area TSA and can be respectively connected to the second touch pads TP2 disposed in the pad unit PD.

[0078] The driving electrodes TE disposed at one edge (e.g., the lower edge) of the touch sensing area TSA can be respectively connected to the first touch driving lines TL1, and the driving electrodes TE disposed at the opposite edge (e.g., the upper edge) of the touch sensing area TSA can be respectively connected to the second touch driving lines TL2. For example, some of the driving electrodes TE that are electrically connected to each other in the second direction (Y-axis direction) and include the driving electrodes TE at the lower end of the touch sensing area TSA can be respectively connected to the first touch driving lines TL1, and the driving electrodes TE that are electrically connected to each other in the second direction (Y-axis direction) and include the driving electrodes TE at the upper end can be respectively connected to the second touch driving lines TL2.

[0079] The first touch driving lines TL1 and the second touch driving lines TL2 can be connected to the pad unit PD formed in the sub-area SBA of the display panel 100 via a part of the touch peripheral area TPA. For example, the second touch driving lines TL2 can extend around the left side of the touch sensing area TSA and be connected to the driving electrodes TE on the upper side of the touch sensing area TSA. The first touch driving lines TL1 and the second touch driving lines TL2 can also be connected to the pad unit PD formed in the sub-area SBA adjacent to the lower side of the touch sensing area TSA. The first touch driving lines TL1 and the second touch driving lines TL2 can be particularly connected to the corresponding first touch pads TP1 in the pad unit PD.

[0080] The driving electrodes TE are connected to the first touch driving lines TL1 and the second touch driving lines TL2 on the opposite sides of the touch sensing area TSA to receive touch driving signals through the first touch driving lines TL1 and the second touch driving lines TL2 on the opposite sides. These connections can prevent the difference between the touch driving signal applied to the driving electrodes TE disposed on the lower side of the touch sensing area TSA and the touch driving signal applied to the driving electrodes TE disposed on the upper side of the touch sensing area TSA caused by the RC delay of the touch driving signal.

[0081] At least one inspection signal transmission line IVL may be disposed in the touch peripheral area TPA along the periphery of the touch sensing area TSA. The inspection signal transmission line IVL may be formed by the same process on the same process layer having the same metal material as at least any one of the at least one driving electrode TE, sensing electrode RE, dummy pattern DE, first touch driving line TL1, second touch driving line TL2, and touch sensing line RL. The inspection signal transmission line IVL may be formed only in the touch peripheral area TPA. For example, the path of the inspection signal transmission line IVL may have a shape surrounding all of the first touch driving lines TL1, second touch driving lines TL2, and touch sensing lines RL along the outermost edge of the touch peripheral area TPA. Optionally, the inspection signal transmission line IVL may cross the touch sensing area TSA and the touch peripheral area TPA. For example, in order to stop the driving electrode TE and the sensing electrode RE from being in electrical contact with each other, the inspection signal transmission line IVL in the touch sensing area TSA and the touch peripheral area TPA may cross the touch sensing area TSA in the first direction (X-axis direction) or the second direction (Y-axis direction). One end of the inspection signal transmission line IVL may be electrically connected to the first touch pad TP1 provided in the pad unit PD, and the other end of the inspection signal transmission line IVL may be electrically connected to the second touch pad TP2. Optionally, one end and the other end of the inspection signal transmission line IVL may be respectively connected to the first touch pad TP1 or the second touch pad TP2.

[0082] When the circuit board 300 is connected to one side of the flexible film as Figures 1 to 3 shown, the display pad area DPA of the pad unit PD and the first touch pad area TPA1 and the second touch pad area TPA2 may be associated with the pads of the circuit board 300 connected to the display panel 100. Accordingly, the pads of the circuit board 300 may contact the display pad DP, the first touch pad TP1, and the second touch pad TP2. The display pad DP, the first touch pad TP1, and the second touch pad TP2 may be electrically connected to the pads of the circuit board 300 using a low-resistance and high-reliability material such as an anisotropic conductive layer and SAP. Accordingly, the display pad DP, the first touch pad TP1, and the second touch pad TP2 may be electrically connected to the touch driving circuit 400 provided on the circuit board 300.

[0083] Figure 6 is schematically shown Figure 3 the layout of the second embodiment of the touch sensing unit as

[0084] Refer to Figure 6, multiple touch electrodes SE can be formed in a matrix structure (in a plan view) and arranged in the touch sensing area TSA of the touch sensing unit TSU. The touch electrodes SE can be connected to touch lines SL extending along the touch sensing area TSA in the touch peripheral area TPA in a one-to-one manner.

[0085] Although a structure in which each of the touch electrodes SE is formed in a planar rectangular shape is illustrated in Figure 6 , the present disclosure is not limited thereto. For example, in addition to a rectangular shape, the touch electrode SE can be formed in a planar polygonal shape other than a rhombus shape, a square shape, a quadrilateral shape, or a planar circular shape or a planar elliptical shape.

[0086] The touch electrode SE can be connected to the touch line SL extending to either side of the touch sensing area TSA and can receive a touch drive signal through the touch line SL.

[0087] Each of the touch lines SL can partially pass through the touch peripheral area TPA and be connected to the pad unit PD in the sub-region SBA of the display panel 100. For example, each of the touch lines SL can pass through the left side, the right side, or the lower side of the touch sensing area TSA and be connected to the pad unit PD formed in the sub-region SBA. The touch line SL can be particularly connected to the first touch pad TP1 and the second touch pad TP2 provided in the pad unit PD in a one-to-one manner.

[0088] Referring to Figure 6 , at least one of the inspection signal transmission lines IVL can be provided along the periphery of the touch sensing area TSA in the touch peripheral area TPA. The inspection signal transmission line IVL can be formed by the same process on the same process layer having the same metal material as at least one of the touch electrodes SE or at least one of the touch lines SL. The inspection signal transmission line IVL can be formed in the touch peripheral area TPA. For example, the inspection signal transmission line IVL can be provided in a shape surrounding all the touch electrodes SE and the touch lines SL along the outermost edge of the touch peripheral area TPA.

[0089] One end of the inspection signal transmission line IVL can be electrically connected to the first touch pad TP1 provided on the pad unit PD, and the other end thereof can be electrically connected to the second touch pad TP2.

[0090] Figure 7 Schematically shows Figure 3 the layout of the third embodiment of the touch sensing unit shown in Figure 7 The touch sensing unit TSU of Figure 7, the check signal transmission line IVL can be disposed outside the touch sensing area TSA, the touch electrodes SE, and the touch lines SL, and can extend in a first direction (e.g., the X-axis direction) along the lower and upper sides of the touch sensing area TSA, and extend in a second direction (e.g., the Y-axis direction) along one side (left or right) of the touch sensing area TSA. The check signal transmission line IVL along the upper side can loop back and return along the upper side, one side, and lower side of the touch sensing area TSA, the touch electrodes SE, and the touch lines SL. The ends of the check signal transmission line IVL can be connected to the first touch pads TP1 one-to-one, or can be connected to the second touch pads TP2 one-to-one.

[0091] Figure 8 Schematically shows Figure 3 the layout of the fourth embodiment of the touch sensing unit shown in Figure 8 The touch sensing unit TSU of Figure 8 can have the same touch electrodes SE and touch lines SL as those described above. Refer to

[0092] Figure 9 is a block diagram schematically showing the first embodiment of the configuration of the touch driving circuit for Figures 1 to 3 shown in

[0093] Figure 9A touch driving circuit 400 connected to an inspection signal transmission line IVL is shown to illustrate the detection of manufacturing process deviations. To detect deviations in the manufacturing process of the display panel 100 or the touch sensing unit TSU, or deviations due to changes in the usage environment and usage time, the touch driving circuit 400 can provide an electrical inspection signal to one end of the inspection signal transmission line IVL, for example, through the first touch pad TP1 or the second touch pad TP2. Here, the touch driving circuit 400 can provide the inspection signal to one end of the inspection signal transmission line IVL in real time or repeatedly according to a preset period. In addition, the touch driving circuit 400 can detect changes in the current amount or voltage amplitude in real time or repeatedly through at least one end (among one end and the other end) of the inspection signal transmission line IVL.

[0094] The touch driving circuit 400 can also change the voltage amplitude or current amount of the touch driving signal provided to the touch line SL and the touch electrode SE based on the change in the voltage amplitude or current amount of the measured inspection signal. To this end, the touch driving circuit 400 can include an inspection signal supply unit 401, a current amount detection unit 402, a comparison circuit unit 403, a compensation value extraction unit 404, and a signal control unit 405.

[0095] The inspection signal supply unit 401 can provide an inspection signal with a preset voltage level to the inspection signal transmission line IVL of the touch sensing unit TSU in real time or repeatedly according to a preset period. For one example, the inspection signal supply unit 401 can include a transformer circuit that generates an inspection signal with a current of 60 mA to 250 mA and a voltage of 5 V to 12 V. The inspection signal supply unit 401 can provide an inspection signal with a current of 60 mA to 250 mA and a voltage of 5 V to 12 V to at least one end of the inspection signal transmission line IVL.

[0096] The current amount detection unit 402 is electrically connected to at least one end of the inspection signal transmission line IVL and detects the current amount flowing in the inspection signal transmission line IVL. The current amount detection unit 402 can include at least one current converter such as a shunt resistor or a current conversion circuit.

[0097] The comparison circuit unit 403 compares the current amount detected by the current amount detection unit 402 with a preset reference current amount R_I and outputs a comparison signal corresponding to the current amount difference. The comparison circuit unit 403 can include at least one digital logic circuit unit such as an operational amplifier or a comparator having an analog-to-digital converter. Therefore, the comparison circuit unit 403 can provide a digital comparison signal corresponding to the current amount difference between the current amount detected by the current amount detection unit 402 and the reference current amount R_I to the compensation value extraction unit 404.

[0098] The compensation value extraction unit 404 extracts a compensation value that can be preset to be inversely proportional to the difference in the amount of current included in the comparison signal output from the comparison circuit unit 403, and the compensation value extraction unit 404 provides the extracted compensation value to the signal control unit 405. The compensation value that is inversely proportional to the difference between the amount of current detected by the current amount detection unit 402 and the reference current amount R_I can be pre-stored in a memory, a look-up table, or the like.

[0099] The signal control unit 405 selects the voltage amplitude or the amount of current of the touch drive signal according to the compensation value output from the compensation value extraction unit 404, and can provide the selected voltage amplitude or the amount of current to the plurality of touch electrodes SE or drive electrodes TE. The signal control unit 405 may include at least one transformer circuit, a power supply circuit, and a variable resistor.

[0100] Table 1

[0101] Line width or line thickness Line resistance TE sets AVDD TE drives AVDD Minimum Maximum 3.6V 3.6V Typical Typical 3.3V 3.3V Maximum Minimum 3.0V 3.0V

[0102] Table 1 shows how the resistances of the drive electrode TE, the touch line SL, and the inspection signal transmission line IVL in the touch sensing unit TSU increase as the line width or line thickness becomes narrower. As the line width or line thickness of the touch line SL and the inspection signal transmission line IVL becomes narrower and the resistance increases, the amount of current in the inspection signal transmission line IVL detected by the current amount detection unit 402 decreases and less current is detected.

[0103] The comparison circuit unit 403 compares the current reference current amount R_I with the amount of current detected by the current amount detection unit 402, and based on this comparison, the comparison circuit unit 403 outputs a comparison signal corresponding to the difference between the currents. The compensation value extraction unit 404 extracts a compensation value that is inversely proportional to the difference indicated by the comparison signal, and provides the compensation value to the signal control unit 405.

[0104] As shown in Table 1, the signal control unit 405 can increase or set the voltage amplitude and the amount of current of the touch drive signal according to the compensation value (TE setting AVDD) output from the compensation value extraction unit 404. In addition, the signal control unit 405 can provide the increased voltage amplitude (TE drive AVDD) and the amount of current of the touch drive signal to the touch line SL and the plurality of touch electrodes SE or drive electrodes TE.

[0105] Conversely, as the line width or line thickness of the touch line SL and the inspection signal transmission line IVL becomes larger or wider and the resistance decreases, the current amount of the inspection signal transmission line IVL detected by the current amount detection unit 402 increases and is detected more frequently. The signal control unit 405 reduces and sets the voltage amplitude and current amount of the touch drive signal according to the compensation value (TE setting AVDD) output from the compensation value extraction unit 404. In addition, the signal control unit 405 supplies the reduced voltage amplitude (TE drive AVDD) and current amount of the touch drive signal to the plurality of touch electrodes SE or drive electrodes TE through the touch line SL.

[0106] When the line width or line thickness of the touch line SL and the inspection signal transmission line IVL are formed according to normal standards, the current amount detected by the current amount detection unit 402 can be within the same range as a preset reference current amount R_I. The signal control unit 405 sets the voltage amplitude (TE drive AVDD) and current amount of the touch drive signal to a reference amplitude and a reference current amount according to the compensation value within the normal range output from the compensation value extraction unit 404. Then, according to the reference amplitude and the reference current amount, the voltage amplitude (TE drive AVDD) and current amount of the touch drive signal are supplied to the plurality of touch electrodes SE or drive electrodes TE through the touch line SL.

[0107] Figure 10 is a schematic illustration for Figures 1 to 3 a second embodiment of the configuration of the touch drive circuit shown in. Refer to Figure 10 , the touch drive circuit 400 includes an inspection signal supply unit 401, a comparison circuit unit 403, a compensation value extraction unit 404, and a signal control unit 405.

[0108] The inspection signal supply unit 401 supplies an inspection signal having a preset voltage level to the inspection signal transmission line IVL of the touch sensing unit TSU in real time or according to a preset period. The inspection signal supply unit 401 can supply an inspection signal having a current of 60 mA to 250 mA and a voltage of 5 V to 12 V to at least one end of the inspection signal transmission line IVL.

[0109] The comparison circuit unit 403 is electrically connected to one end of the inspection signal transmission line IVL (for example, the other end of the inspection signal transmission line IVL), and compares the voltage amplitude of the inspection signal transmission line IVL with a preset reference voltage R_V. Then, the comparison circuit unit 403 outputs a comparison signal corresponding to the voltage amplitude difference to the compensation value extraction unit 404. For this purpose, the comparison circuit unit 403 may include at least one digital logic circuit unit such as an operational amplifier or a comparator having an analog-to-digital converter.

[0110] The compensation value extraction unit 404 extracts, for example, using a lookup table, a compensation value that is inversely proportional to the difference in voltage amplitude indicated by the comparison signal output from the comparison circuit unit 403. The compensation value extraction unit 404 provides the extracted compensation value to the signal control unit 405.

[0111] The signal control unit 405 can supply the voltage amplitude and current amount of the touch drive signal corresponding to the compensation value output from the compensation value extraction unit 404 to the touch line SL and the plurality of touch electrodes SE or drive electrodes TE.

[0112] The signal control unit 405 can increase or decrease and set the voltage amplitude and current amount of the touch drive signal according to the compensation value (TE setting AVDD) output from the compensation value extraction unit 404. Optionally, the signal control unit 405 can set the voltage amplitude and current amount of the touch drive signal to a reference amplitude and reference current amount according to the compensation value (TE setting AVDD) within the normal range output from the compensation value extraction unit 404. In addition, the signal control unit 405 can increase or decrease the voltage amplitude (TE drive AVDD) and current amount of the touch drive signal and supply them to the plurality of touch electrodes SE or drive electrodes TE. The signal control unit 405 can supply the voltage amplitude (TE drive AVDD) and current amount of the touch drive signal to the plurality of touch electrodes SE or drive electrodes TE according to the reference amplitude and reference current amount.

[0113] Figure 11 and Figure 12 is a perspective view showing a display device according to another embodiment of the present disclosure.

[0114] Figure 11 and Figure 12 The display device 10 is shown as a foldable display device folded around an axis extending in the second direction (Y-axis direction). The display device 10 can be in a folded state ( Figure 12 ) or an unfolded state ( Figure 11 ). The display device 10 can be folded in an inner fold manner in which the front surface is disposed on the inner side of the display device 10 when the display device 10 is in the folded state. When the display device 10 is bent or folded in the inner fold manner, portions of the front surface of the display device 10 can face each other. Optionally, the display device 10 can be folded in an outer fold manner in which the front surface is disposed on the outer side of the display device 10 when the display device 10 is folded. When the display device 10 is bent or folded in the outer fold manner, the rear surfaces of the display device 10 can face each other.

[0115] Figure 11 and Figure 12The display device 10 may have a first non-foldable area NFA1 on one side (e.g., the right side) of the fold area FDA. A second non-foldable area NFA2 may be on the other side (e.g., the left side) of the fold area FDA. The touch sensing unit TSU according to an embodiment of the present disclosure may be disposed on each of the first non-foldable area NFA1 and the second non-foldable area NFA2.

[0116] The first fold line FOL1 and the second fold line FOL2 extend in the second direction (Y-axis direction), and the display device 10 may be folded about an axis parallel to the first fold line FOL1 and the second fold line FOL2. Accordingly, the folded display device 10 may reduce the length of the display device 10 in the first direction (X-axis direction) by approximately half, enabling the user to conveniently carry the display device 10.

[0117] The first fold line FOL1 and the second fold line FOL2 are not limited to lines extending in the second direction (Y-axis direction). For example, the first fold line FOL1 and the second fold line FOL2 may extend in the first direction (X-axis direction), and the display device 10 may be folded in the second direction (Y-axis direction). In this case, the fold may reduce the length of the display device 10 in the second direction (Y-axis direction) by approximately half. Alternatively, the first fold line FOL1 and the second fold line FOL2 may extend in a diagonal direction between the first direction (X-axis direction) and the second direction (Y-axis direction) of the display device 10. In this case, the display device 10 having a rectangular shape may be folded into a triangular shape.

[0118] When the first fold line FOL1 and the second fold line FOL2 extend in the second direction (Y-axis direction), the length of the fold area FDA in the first direction (X-axis direction) may be shorter than the length of the fold area FDA in the second direction (Y-axis direction). In addition, the length of the first non-foldable area NFA1 in the first direction (X-axis direction) may be longer than the length of the fold area FDA in the first direction (X-axis direction). The length of the second non-foldable area NFA2 in the first direction (X-axis direction) may be longer than the length of the fold area FDA in the first direction (X-axis direction).

[0119] The first display area DA1 may be on the front surface of the display device 10. The first display area DA1 may overlap with the fold area FDA, the first non-foldable area NFA1, and the second non-foldable area NFA2. Accordingly, when the display device 10 is unfolded, an image may be displayed toward the front side in the fold area FDA, the first non-foldable area NFA1, and the second non-foldable area NFA2 of the display device 10.

[0120] The second display area DA2 may be on the rear surface of the display device 10. The second display area DA2 may overlap with the second non-foldable area NFA2. Thus, when the display device 10 is folded, an image may be displayed in the second non-foldable area NFA2 of the display device 10 in the third direction (Z-axis direction), as Figure 12 shown in

[0121] Figure 11 and Figure 12 It is also shown that a through hole TH for a camera may be provided in the first non-foldable area NFA1, but the present disclosure is not limited thereto. The through hole TH or the camera may be provided in the second non-foldable area NFA2 or the foldable area FDA.

[0122] Figure 13 and Figure 14 is a perspective view showing a display device according to another embodiment of the present disclosure.

[0123] Figure 13 and Figure 14 The display device 10 is shown as a foldable display device that can be folded about an axis extending in the first direction (X-axis direction). The display device 10 has Figure 14 the folded state shown in Figure 13 and the unfolded state shown in. The display device 10 may be folded in an inner-fold manner with the front surface on the inside of the folded display device 10. When the display device 10 is bent or folded in the inner-fold manner, the front surfaces of the display device 10 may face each other. Alternatively, the display device 10 may be folded in an outer-fold manner with the front surface provided on the outside of the display device 10. When the display device 10 is bent or folded in the outer-fold manner, parts of the rear surface of the display device 10 may face each other.

[0124] The display device 10 may include a foldable area FDA, a first non-foldable area NFA1, and a second non-foldable area NFA2. The foldable area FDA may be an area where the display device 10 is folded, and the first non-foldable area NFA1 and the second non-foldable area NFA2 may be areas where the display device 10 is not folded. The first non-foldable area NFA1 may be provided on one side (e.g., the lower side) of the foldable area FDA. The second non-foldable area NFA2 may be provided on the other side (e.g., the upper side) of the foldable area FDA.

[0125] According to an embodiment of the present disclosure, a touch sensing unit TSU may be provided on each of the first non-foldable area NFA1 and the second non-foldable area NFA2.

[0126] When the display device 10 is folded, the folding area FDA can be a curved area with a predetermined curvature between the first folding line FOL1 and the second folding line FOL2. Therefore, the first folding line FOL1 can be the boundary between the folding area FDA and the first non-folding area NFA1, and the second folding line FOL2 can be the boundary between the folding area FDA and the second non-folding area NFA2. As Figure 13 and Figure 14 shown, the first folding line FOL1 and the second folding line FOL2 can extend in the first direction (X-axis direction). In this case, the display device 10 can be folded in the second direction (Y-axis direction). Therefore, the length of the display device 10 in the second direction (Y-axis direction) can be reduced by approximately half, enabling the user to conveniently carry the display device 10.

[0127] The first folding line FOL1 and the second folding line FOL2 are not limited to the lines extending in the first direction (X-axis direction). For example, the first folding line FOL1 and the second folding line FOL2 can extend in the second direction (Y-axis direction), and the display device 10 can be folded in the first direction (X-axis direction). In this case, the length of the display device 10 in the first direction (X-axis direction) can be reduced to approximately half. Alternatively, the first folding line FOL1 and the second folding line FOL2 can extend in the diagonal direction between the first direction (X-axis direction) and the second direction (Y-axis direction) of the display device 10. In this case, the display device 10 can be folded from a rectangular shape into a triangular shape.

[0128] When the first folding line FOL1 and the second folding line FOL2 are as Figure 13 and Figure 14 shown and extend in the first direction (X-axis direction), the length of the folding area FDA in the second direction (Y-axis direction) can be shorter than the length of the folding area FDA in the first direction (X-axis direction). Additionally, the length of the first non-folding area NFA1 in the second direction (Y-axis direction) can be longer than the length of the folding area FDA in the second direction (Y-axis direction). The length of the second non-folding area NFA2 in the second direction (Y-axis direction) can be longer than the length of the folding area FDA in the second direction (Y-axis direction).

[0129] The first display area DA1 can be provided on the front surface of the display device 10. The first display area DA1 can overlap with the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2. Therefore, when the display device 10 is unfolded, an image can be displayed toward the front side of the display device 10 in the folding area FDA, the first non-folding area NFA1, and the second non-folding area NFA2 of the display device 10.

[0130] The second display area DA2 may be provided on the rear surface of the display device 10. The second display area DA2 may overlap with the second non-foldable area NFA2. Thus, when the display device 10 is folded, an image may be displayed toward the front side of the display device 10 in the second non-foldable area NFA2 of the display device 10.

[0131] Figure 13 and Figure 14 It is also shown that a through hole TH in which a camera or the like is located may be provided in the second non-foldable area NFA2, but the present disclosure is not limited thereto. The through hole TH may be provided in the first non-foldable area NFA1 or the foldable area FDA.

[0132] Upon concluding the detailed description, those skilled in the art will appreciate that many variations and modifications can be made to the exemplary embodiments without substantially departing from the principles of the present disclosure. Accordingly, the disclosed embodiments are used only in a general and descriptive sense and not for purposes of limitation.

Claims

1. Touch detection module, comprising: A touch sensing unit, including touch electrodes and inspection signal transmission lines, the touch electrodes being in the touch sensing area of the touch sensing unit and connected to touch lines, the touch lines extending through the touch peripheral area of the touch sensing unit; And A touch driving circuit, which provides an inspection signal to the inspection signal transmission line and changes the voltage amplitude or current amount of the touch driving signal provided to the touch electrodes, the change being made according to the change in the voltage amplitude or current amount of the inspection signal, wherein the touch driving circuit provides the touch driving signal with the changed voltage amplitude or current amount to the touch electrodes, and detects the touch sensing signal from the touch electrodes to detect the coordinates of the touch position.

2. The touch detection module according to claim 1, Among them, The inspection signal transmission line is disposed in at least one of the touch sensing area and the touch peripheral area, and wherein the inspection signal transmission line is formed on the same process layer having the same metal material as at least one of the touch electrodes or at least one of the touch lines.

3. The touch detection module according to claim 2, Among them, The inspection signal transmission line is disposed along the outermost edge of the touch peripheral area in a shape surrounding the touch lines and the touch electrodes.

4. The touch detection module according to claim 3, Among them, One end of the inspection signal transmission line is electrically connected to a first touch pad disposed on one side of the pad unit of the display panel, and the other end of the inspection signal transmission line is electrically connected to a second touch pad disposed on the other side of the pad unit.

5. The touch detection module according to claim 2, Among them, The inspection signal transmission line is disposed in the touch sensing area and the touch peripheral area in a plan view, crossing the touch sensing area at least once without being electrically connected to the touch electrodes or the touch lines.

6. The touch detection module according to claim 5, Among them, The inspection signal transmission line is formed on the same process layer having the same metal material as the at least one touch electrode and is formed on a process layer different from the touch lines.

7. The touch detection module according to claim 2, Among them, The inspection signal transmission line extends along a second direction below the lower edge of the touch sensing area, extends in a first direction outside one side of the touch sensing area, and extends along the second direction above the upper edge of the touch sensing area.

8. The touch detection module according to claim 2, Among them, The inspection signal transmission line is disposed in the touch peripheral area outside the upper edge, one side and the lower edge of the touch sensing area, the touch electrodes, and the touch lines.

9. The touch detection module according to claim 8, Among them, One end of the inspection signal transmission line is electrically connected to a first touch pad disposed on one side of the pad unit of the display panel, and the other end of the inspection signal transmission line is electrically connected to a second touch pad disposed on the same side of the pad unit.

10. The touch detection module according to claim 2, Among them, The touch driving circuit provides the inspection signal to the first end of the inspection signal transmission line in real time or for each preset period, detects a change in the current amount or voltage amplitude of the inspection signal through at least one of the first end and the second end of the inspection signal transmission line, and changes the current amount or voltage amplitude of the touch driving signal to correspond to the change in the current amount or voltage amplitude of the inspection signal.

11. The touch detection module according to claim 10, Among them, The touch driving circuit includes: An inspection signal supply unit that provides the inspection signal at a preset voltage level to the inspection signal transmission line; A current amount detection unit that detects the current amount flowing in the inspection signal transmission line; A comparison circuit unit that compares the current amount detected by the current amount detection unit with a preset reference current amount and outputs a comparison signal corresponding to the current amount difference; A compensation value extraction unit that extracts and outputs a compensation value inversely proportional to the current amount difference; and A signal control unit that changes the current amount or voltage amplitude of the touch driving signal to correspond to the compensation value output from the compensation value extraction unit.

12. The touch detection module according to claim 10, Among them, The touch driving circuit includes: An inspection signal supply unit that provides the inspection signal at a preset voltage level to the inspection signal transmission line; A comparison circuit unit electrically connected to at least one end of the inspection signal transmission line and configured to compare the voltage amplitude of the inspection signal transmission line with a reference voltage and output a comparison signal corresponding to the voltage amplitude difference; A compensation value extraction unit that extracts and outputs a compensation value inversely proportional to the voltage amplitude difference; and A signal control unit that changes the current amount or voltage amplitude of the touch driving signal to correspond to the compensation value output from the compensation value extraction unit.

13. A display device, comprising: A display panel including a display area in which a plurality of sub-pixels are arranged; And A touch detection module on the display panel and configured to sense a user's touch; Wherein, the touch detection module includes: A touch sensing unit including a touch electrode and an inspection signal transmission line, the touch electrode being in a touch sensing area of the touch sensing unit and connected to a touch line that extends through a touch peripheral area of the touch sensing unit; and A touch driving circuit that provides an inspection signal to the inspection signal transmission line and changes the current amount or voltage amplitude of a touch driving signal provided to the touch electrode, the change being made according to a change in the current amount or voltage amplitude of the inspection signal, Wherein, the touch driving circuit provides the touch driving signal with the changed voltage amplitude or current amount to the touch electrode and detects a touch sensing signal from the touch electrode to detect the coordinates of the touch position.

14. The display device according to claim 13, Among them, The inspection signal transmission line is disposed in at least one of the touch sensing region and the touch peripheral region, and wherein the inspection signal transmission line is formed on the same process layer having the same metal material as at least one of the touch electrodes or at least one of the touch lines among the touch electrodes.

15. The display device according to claim 14, wherein, Among them, the inspection signal transmission line is disposed along the outermost edge of the touch peripheral region in a shape surrounding the touch lines and the touch electrodes.

16. The display device according to claim 14, wherein, Among them, the inspection signal transmission line is disposed in the touch sensing region and the touch peripheral region in a plan view, and crosses the touch sensing region at least once without being electrically connected to the touch electrodes or the touch lines.

17. The display device according to claim 14, Among them, the inspection signal transmission line extends along a second direction below the lower edge of the touch sensing region, extends in a first direction outside one side of the touch sensing region, and extends along the second direction above the upper edge of the touch sensing region.

18. The display device according to claim 14, Among them, the touch driving circuit provides the inspection signal to the first end of the inspection signal transmission line in real time or for each preset period, detects a change in the current amount or the voltage amplitude of the inspection signal through at least one of the first end and the second end of the inspection signal transmission line, and changes the current amount or the voltage amplitude of the touch driving signal to correspond to the change in the voltage amplitude or the current amount of the inspection signal.

19. The display device according to claim 18, Among them, the touch driving circuit includes: an inspection signal supply unit that provides the inspection signal of a preset voltage level to the inspection signal transmission line; a current amount detection unit that detects the current amount flowing in the inspection signal transmission line; a comparison circuit unit that compares the current amount detected by the current amount detection unit with a preset reference current amount and outputs a comparison signal corresponding to the current amount difference; a compensation value extraction unit that extracts and outputs a compensation value inversely proportional to the current amount difference; and a signal control unit that changes the current amount or the voltage amplitude of the touch driving signal to correspond to the compensation value output from the compensation value extraction unit.

20. The display device according to claim 18, Among them, the touch driving circuit includes: an inspection signal supply unit that provides the inspection signal of a preset voltage level to the inspection signal transmission line; a comparison circuit unit electrically connected to at least one end of the inspection signal transmission line, the comparison circuit unit configured to compare the voltage amplitude of the inspection signal transmission line with a reference voltage and output a comparison signal corresponding to the voltage amplitude difference; a compensation value extraction unit that extracts and outputs a compensation value inversely proportional to the voltage amplitude difference indicated by the comparison signal; and A signal control unit changes the amount of current or the voltage amplitude of the touch driving signal to correspond to the compensation value output from the compensation value extraction unit.

Images