Touch sensor

Abstract

Disclosed is a touch sensor including a sensor unit having a first region including at least one pair of first and second electrodes and a second region including at least two pairs of first and second electrodes, a plurality of sensing channels each including a first input terminal and a second input terminal, wherein the first input terminal of a sensing channel is connected to a different one of the first electrodes, an amplification circuit connected between the second electrodes and the second input terminals of the sensing channels, and an input control unit connected between the amplification circuit and the second electrodes, the input control unit including a first resistor connected to the second electrodes of the first region and a second resistor commonly connected to the second electrodes of the second region.

Description

[0001] Cross-reference to related applications

[0002] This application claims priority and benefit to Korean Patent Application No. 10-2017-0127730, filed on September 29, 2017, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] This disclosure relates to touch sensors and display devices including touch sensors. Background Technology

[0004] Touch sensors can be used in display devices. For example, a touch sensor can be attached to a surface of the display panel or integrally formed with the display panel to sense touch input. Summary of the Invention

[0005] The implementation provides a high-sensitivity touch sensor and a display device including the high-sensitivity touch sensor.

[0006] According to an aspect of this disclosure, a touch sensor is provided, the touch sensor including a sensor unit, a plurality of sensing channels, an amplification circuit, and an input control unit, wherein the sensor unit has a first region including at least one pair of first electrodes and a second electrode, and a second region including at least two pairs of first electrodes and a second electrode, each of the plurality of sensing channels including a first input terminal and a second input terminal, wherein the first input terminal of the sensing channel is connected to different first electrodes among the first electrodes, the amplification circuit is connected between the second electrode and the second input terminal of the sensing channel, the input control unit is connected between the amplification circuit and the second electrode, and the input control unit includes a first resistor connected to the second electrode of the first region and a second resistor commonly connected to the second electrode of the second region.

[0007] The amplifier circuit may include an amplifier and a plurality of output resistors connected in parallel, wherein the amplifier includes an input terminal that is commonly connected to a first end of a first resistor and a first end of a second resistor, and the plurality of output resistors connected in parallel are connected to the output terminal of the amplifier and respectively connected to different sensing channels in the sensing channels.

[0008] A first resistor may be connected to the second electrode of the first region and the input terminal of the amplifier, and a second resistor may be connected between the second electrode of the second region and the input terminal of the amplifier.

[0009] The second input terminal of the sensing channel can be connected to the corresponding output resistor in the output resistor.

[0010] The second region may include at least three first electrodes, wherein a second input terminal of a sensing channel connected to any one of the first electrodes of the second region is connected between second input terminals of sensing channels connected to two different first electrodes of the first electrodes of the second region.

[0011] Each of the output resistors can be a variable resistor.

[0012] The sensor unit may also include a third region, which includes at least one pair of first electrodes and second electrodes.

[0013] The input control unit may also include a third resistor connected between the amplifier circuit and the second electrode of the third region.

[0014] The amplifier circuit may include a first amplifier and a second amplifier, wherein the first amplifier includes an input terminal connected to a second electrode of a first region and a first end of a first resistor, and an output terminal connected to a second input terminal of a sensing channel connected to the first electrode of the first region, and the second amplifier includes an input terminal connected to a second electrode of a second region and a first end of a second resistor, and an output terminal connected to a second input terminal of a sensing channel connected to the first electrode of the second region.

[0015] The amplifier circuit may include a first output resistor and a plurality of second output resistors, wherein the first output resistor is connected between the output terminal of the first amplifier and the second input terminal of the sensing channel connected to the first electrode of the first region, and the plurality of second output resistors are connected between the output terminal of the second amplifier and the second input terminal of the sensing channel connected to the first electrode of the second region.

[0016] The first terminal of the first output resistor and the first terminal of the second output resistor can be connected to a reference voltage source.

[0017] The first end of the first output resistor can be connected to the output terminal of the first amplifier, and the second end of the first output resistor can be connected to the output terminal of the second amplifier.

[0018] The first end of the second output resistor can be connected to the output terminal of the second amplifier, and the second end of the second output resistor can be connected to the output terminal of the third amplifier or a reference voltage source.

[0019] The touch sensor may also include a third region, at least one additional sensing channel, and a third output resistor, wherein the third region includes at least one second electrode connected to an input terminal of a third amplifier and at least one first electrode corresponding to the at least one second electrode, the at least one additional sensing channel includes a first input terminal connected to the first electrode of the third region and a second input terminal connected to an output terminal of the third amplifier, and the third output resistor is connected between the second input terminal of the sensing channel connected to the first electrode of the third region and the output terminal of the third amplifier.

[0020] The first end of the first resistor can be connected to the second electrode of the first region and the input terminal of the first amplifier, and the second end of the first resistor can be connected to a reference voltage source. The first end of the second resistor can be connected to the second electrode of the second region and the input terminal of the second amplifier, and the second end of the second resistor can be connected to a reference voltage source.

[0021] Each of the sensing channels includes a differential amplifier that can be configured to output a signal corresponding to the voltage difference between the first input terminal and the second input terminal.

[0022] The first electrode and the second electrode may be arranged to be spaced apart from each other, and a corresponding pair of first electrodes and second electrodes may extend in a first direction in a first region or a second region, while at least partially overlapping each other.

[0023] The sensor unit may also include a plurality of third electrodes extending in a second direction to intersect with the first and second electrodes.

[0024] According to aspects of this disclosure, a display device including a display panel and a touch sensor is provided, wherein the display panel includes a display area having a plurality of pixels therein, and the touch sensor includes an effective area comprising a first area and a second area overlapping the display area. The touch sensor includes at least one pair of first electrodes and a second electrode disposed in the first area, at least two pairs of first electrodes and a second electrode disposed in the second area, a plurality of sensing channels, an amplification circuit, and an input control unit. Each of the plurality of sensing channels includes a first input terminal and a second input terminal. The first input terminal of the sensing channel is connected to different first electrodes among the first electrodes. The amplification circuit is connected between the second electrode and the second input terminal of the sensing channel. The input control unit is connected between the amplification circuit and the second electrode. The input control unit includes a first resistor connected to the second electrode of the first area and a second resistor commonly connected to the second electrode of the second area.

[0025] The amplifier circuit may include at least one amplifier and a plurality of output resistors, wherein the at least one amplifier includes an input terminal connected to a second electrode of a first region and a second electrode of a second region, as well as a first resistor and a second resistor, and the plurality of output resistors are connected in parallel to the output terminal of the amplifier, and the plurality of output resistors are connected to different sensing channels in the sensing channels. Attached Figure Description

[0026] Exemplary embodiments will now be described more fully below with reference to the accompanying drawings; however, exemplary embodiments may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the exemplary embodiments to those skilled in the art.

[0027] For clarity, dimensions may be exaggerated in the accompanying drawings. It will be understood that when an element is referred to as being "between" two elements, it may be the only element between the two elements, or there may be one or more intermediate elements. Throughout the text, the same reference numerals refer to the same elements.

[0028] Figure 1 A display device according to an embodiment of the present disclosure is illustrated schematically.

[0029] Figure 2 A sensor unit of a touch sensor according to an embodiment of the present disclosure is shown.

[0030] Figure 3 A touch sensor according to an embodiment of the present disclosure is shown.

[0031] Figure 4 A touch sensor according to an embodiment of the present disclosure is shown.

[0032] Figure 5 It shows according to Figure 4 The distribution characteristics of the noise signal at the location of the sensor unit are shown in the figure.

[0033] Figure 6 and Figure 7 Each showed Figure 4 The embodiment of the sensor unit shown is illustrated.

[0034] Figure 8A It shows along Figure 6 An example of a cross section taken by line I-I'.

[0035] Figure 8B It shows along Figure 6 Example of a section cut by line II-II'.

[0036] Figure 8C An example of a cross-section of a display device according to an embodiment of the present disclosure is shown.

[0037] Figure 9 A touch sensor according to an embodiment of the present disclosure is shown.

[0038] Figure 10 A touch sensor according to an embodiment of the present disclosure is shown.

[0039] Figure 11 A touch sensor according to an embodiment of the present disclosure is shown. Detailed Implementation

[0040] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, the present disclosure is not limited to these embodiments, but may be implemented in different forms. These embodiments are provided for illustrative purposes only and to enable those skilled in the art to fully understand the scope of the present disclosure. Throughout the specification, when an element is referred to as “connected” or “coupled” to another element, it may be directly connected or coupled to the other element, or indirectly connected or coupled to the other element using one or more intermediate elements inserted between the element and the other element.

[0041] Furthermore, in the following embodiments and accompanying drawings, elements not directly related to this disclosure have been omitted from the description, and the dimensional relationships between the various elements in the drawings are shown for ease of understanding only and are not intended to limit actual scale. It should be noted that when assigning reference numerals to elements in each drawing, the same reference numerals refer to the same elements, even if the same elements are shown in different drawings.

[0042] Figure 1 A display device according to an embodiment of the present disclosure is illustrated schematically. Figure 2 A sensor unit of a touch sensor according to an embodiment of the present disclosure is shown.

[0043] refer to Figure 1 The display device according to this embodiment includes a sensor unit 100, a touch driver 200, a display panel 300, and a display driver 400. The sensor unit 100 and the touch driver 200 constitute a touch sensor.

[0044] At the same time, Figure 1 In the embodiments shown, the sensor unit 100 and the display panel 300 are separated from each other, but this disclosure is not limited thereto. For example, the sensor unit 100 and the display panel 300 may be manufactured integrally.

[0045] In some embodiments, the sensor unit 100 may be disposed on at least one area of ​​the display panel 300. For example, the sensor unit 100 may be disposed on at least one surface of the display panel 300 to overlap with the display panel 300. For example, the sensor unit 100 may be located on a surface (e.g., the upper surface) of the display panel 300 in the direction of image transmission.

[0046] In another embodiment, the sensor unit 100 may be formed directly on at least one surface of the display panel 300, or it may be formed inside the display panel 300. For example, the sensor unit 100 may be formed directly on the outer surface (e.g., the upper surface of the upper substrate or the lower surface of the lower substrate) of the upper substrate (or encapsulation layer) or the lower substrate of the display panel 300, or it may be formed directly on the inner surface (e.g., the lower surface of the upper substrate or the upper surface of the lower substrate) of the upper substrate or the lower substrate.

[0047] The sensor unit 100 includes an effective area 101 capable of sensing touch input and an ineffective area 102 surrounding at least a portion of the effective area 101. In some embodiments, the effective area 101 may be positioned to correspond to the display area 301 of the display panel 300, and the ineffective area 102 may be positioned to correspond to the non-display area 302 of the display panel 300. For example, the effective area 101 of the sensor unit 100 may overlap with the display area 301 of the display panel 300, and the ineffective area 102 of the sensor unit 100 may overlap with the non-display area 302 of the display panel 300.

[0048] In some embodiments, the effective area 101 may be provided with at least one electrode for detecting touch input (e.g., a plurality of sensing electrodes (first electrodes) 120 and a plurality of driving electrodes (third electrodes) 130). That is, the effective area 101 may be a touch sensing area capable of sensing the user's touch input.

[0049] In some embodiments, the sensing electrode 120 and the driving electrode 130 may be disposed on the display area 301 of the display panel 300. In this case, the sensing electrode 120 and the driving electrode 130 may overlap with at least one electrode disposed in the display panel 300. For example, when the display panel 300 is an organic light-emitting display panel or a liquid crystal display panel, the sensing electrode 120 and the driving electrode 130 may overlap with at least the cathode electrode or common electrode of the display panel 300.

[0050] More specifically, the sensor unit 100 may include a plurality of sensing electrodes 120 and a plurality of driving electrodes 130 disposed intersecting each other in an effective region 101. For example, the effective region 101 may be provided with a plurality of sensing electrodes 120 and a plurality of driving electrodes 130, each of the plurality of sensing electrodes 120 extending along a first direction (e.g., the X direction) and each of the plurality of driving electrodes 130 extending in a second direction (e.g., the Y direction) to intersect with the sensing electrodes 120. In some embodiments, the sensing electrodes 120 and the driving electrodes 130 may be insulated from each other by at least one insulating layer.

[0051] A capacitance Cse is formed between the sensing electrode 120 and the driving electrode 130, for example, at the intersection of the sensing electrode 120 and the driving electrode 130. This capacitance Cse changes when a touch input occurs at or near the corresponding point. Therefore, touch input can be sensed by detecting the change in capacitance Cse.

[0052] The shape, size, and / or arrangement orientation of the sensing electrode 120 and the driving electrode 130 are not specifically limited. In related non-limiting embodiments, the sensing electrode 120 and the driving electrode 130 may be as follows: Figure 2 Configure it as shown. Figure 1 and Figure 2 In this embodiment, a touch sensor using the mutual capacitance method is disclosed as the touch sensor according to this embodiment. However, the touch sensor according to this embodiment is not limited to a touch sensor using the mutual capacitance method.

[0053] refer to Figure 2 The sensor unit 100 includes a substrate 110, a plurality of sensing electrodes 120 and a plurality of driving electrodes 130, as well as a plurality of lines 140 and pad units 150. The substrate 110 includes an effective region 101 and an ineffective region 102. The plurality of sensing electrodes 120 and the plurality of driving electrodes 130 are disposed in the effective region 101 of the substrate 110, and the plurality of lines 140 and pad units 150 are disposed in the ineffective region 102 of the substrate 110. In another embodiment of this disclosure, the touch sensor may be implemented as a touch sensor using a self-capacitance method. In this case, the plurality of touch electrodes may be distributed at coordinate points in the effective region 101.

[0054] The substrate 110 is a substrate that serves as the base component of the sensor unit 100, and can be a rigid substrate or a flexible substrate. For example, the substrate 110 can be a rigid substrate made of glass or tempered glass, or a flexible substrate made of flexible plastic or metal film. In some embodiments, the substrate 110 can be a display substrate constituting the display panel 300 or one of one or more insulating layers. For example, in embodiments where the sensor unit 100 and the display panel 300 are integrally implemented, the substrate 110 can be at least one display substrate (e.g., an upper substrate) or a thin-film encapsulation (TFE).

[0055] The sensing electrode 120 may extend along a first direction, for example, the X direction in the effective region 101. In some embodiments, each of the sensing electrodes 120 may include a plurality of first electrode units 122 and at least one first connection portion 124, wherein the plurality of first electrode units 122 are arranged along the first direction, and the at least one first connection portion 124 connects the first electrode units 122 constituting the sensing electrode 120 along the first direction. In this embodiment, "connection" may broadly mean a physical and / or electrical connection. When each of the sensing electrodes 120 includes three or more first electrode units 122, each of the sensing electrodes 120 may include a plurality of first connection portions 124. In some embodiments, the first connection portions 124 may be integrally configured with the first electrode units 122, or may be configured as a bridging type connection pattern.

[0056] at the same time, Figure 2 The illustration shows an embodiment where the first connecting portion 124 is positioned along a first direction, but this disclosure is not limited thereto. For example, in another embodiment, the first connecting portion 124 may be located in an inclined direction relative to the first direction. Furthermore, Figure 2 The illustration shows an embodiment where the first connecting portion 124 has a linear shape (or a rod shape), but this disclosure is not limited thereto. Furthermore, Figure 2 The illustration shows an embodiment in which two adjacent first electrode units 122 are connected to each other by a first connecting portion 124 located between them, but the present disclosure is not limited thereto. For example, in another embodiment, two adjacent first electrode units 122 may be connected to each other by a plurality of first connecting portions 124 located between them.

[0057] In some embodiments, the first electrode unit 122 and / or the first connection portion 124 may include at least one of a metallic material, a transparent conductive material, and various other conductive materials to achieve conductivity. For example, the first electrode unit 122 and / or the first connection portion 124 may include at least one of a variety of metallic materials (such as gold (Au), silver (Ag), aluminum (Al), molybdenum (Mo), chromium (Cr), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and platinum (Pt)) or any alloy thereof. Furthermore, the first electrode unit 122 and / or the first connection portion 124 may include at least one of a variety of transparent conductive materials (such as silver nanowires (AgNW), indium tin oxide (ITO), indium zinc oxide (IZO), zinc antimony oxide (AZO), indium tin zinc oxide (ITZO), zinc oxide (ZnO), tin oxide (SnO2), carbon nanotubes, and graphene). Additionally, the first electrode unit 122 and / or the first connection portion 124 may include at least one of a variety of conductive materials capable of providing conductivity. In some embodiments, the first electrode unit 122 and / or the first connection portion 124 may be configured as a single layer or multiple layers.

[0058] In some embodiments, when the touch sensor according to this embodiment is a touch sensor using a mutual capacitance method, the sensing electrode 120 can output a sensing signal corresponding to the driving signal input to the driving electrode 130. For example, the sensing electrode 120 can be an Rx electrode that outputs a sensing signal corresponding to the touch input to the touch driver 200.

[0059] The driving electrode 130 may extend along a second direction (e.g., the Y direction in the effective region 101). In some embodiments, each of the driving electrodes 130 may include a plurality of second electrode units 132 and at least one second connection portion 134, wherein the plurality of second electrode units 132 are arranged along the second direction, and the at least one second connection portion 134 connects the second electrode units 132 constituting the driving electrode 130 along the second direction. When each of the driving electrodes 130 includes three or more second electrode units 132, each of the driving electrodes 130 may include a plurality of second connection portions 134. In some embodiments, the second connection portions 134 may be integrally configured with the second electrode units 132, or may be configured as a bridge-type connection pattern. When the touch sensor according to this embodiment is a touch sensor using a mutual capacitance method, the driving electrode 130 may be a Tx electrode that receives a driving signal from the touch driver 200 during a touch sensing cycle in which the touch sensor is activated.

[0060] At the same time, for convenience, Figure 2The diagram shows the first electrode unit 122 and the second electrode unit 132 having a rhomboid shape, but the shape and size of the first electrode unit 122 and the second electrode unit 132 can be varied. For example, the first electrode unit 122 and the second electrode unit 132 can have another shape, such as a circular shape or a hexagonal shape. In another embodiment, each of the sensing electrode 120 and the driving electrode 130 can be implemented as an integrated rod electrode, etc.

[0061] also, Figure 2 The illustration shows an embodiment where the second connecting portion 134 is located in the second direction, but this disclosure is not limited thereto. For example, in another embodiment, the second connecting portion 134 may be located in an inclined direction relative to the second direction. Furthermore, Figure 2 The illustration shows an embodiment where the second connecting portion 134 has a linear shape (or a rod shape), but this disclosure is not limited thereto. For example, in another embodiment, the second connecting portion 134 may have a shape in which at least one region of each of the second connecting portions 134 is curved or bent. Furthermore, Figure 2 The illustration shows an embodiment in which two adjacent second electrode units 132 are connected to each other by a second connecting portion 134 located between them, but the present disclosure is not limited thereto. For example, in another embodiment, two adjacent second electrode units 132 may be connected to each other by a plurality of second connecting portions 134 located between them.

[0062] In some embodiments, the second electrode unit 132 and / or the second connection portion 134 may include at least one of a metallic material, a transparent conductive material, and various other conductive materials, thereby possessing conductivity. For example, the second electrode unit 132 and / or the second connection portion 134 may include at least one of the conductive materials described as constituting the first electrode unit 122 and / or the first connection portion 124. Furthermore, the second electrode unit 132 and / or the second connection portion 134 may be made of the same conductive material as constituting the first electrode unit 122 and / or the first connection portion 124, or may be made of a different material than constituting the first electrode unit 122 and / or the first connection portion 124. Additionally, each of the second electrode unit 132 and / or the second connection portion 134 may be configured as a single layer or multiple layers.

[0063] In some embodiments, a floating first dummy pattern 136 may be provided in at least one edge region of the effective region 101. For example, a plurality of first dummy patterns 136 floating in an island shape may be provided in two edge regions of the effective region 101. Meanwhile, in another embodiment, the first dummy pattern 136 may be omitted or connected in a first direction or a second direction to form a sensing electrode 120 or a driving electrode 130.

[0064] In some embodiments, lines 140 for electrically connecting the sensing electrode 120 and driving electrode 130 disposed in the active region 101 to the touch driver 200, etc., may be located in the inactive region 102. In some embodiments, lines 140 may include a first line 142 and a second line 144, wherein the first line 142 is used to electrically connect the corresponding sensing electrode 120 to the pad unit 150, and the second line 144 is used to electrically connect the corresponding driving electrode 130 to the pad unit 150. For example, each of the lines 140 may electrically connect either the sensing electrode 120 or the driving electrode 130 to a corresponding pad 152 included in the pad unit 150.

[0065] At the same time, for convenience, Figure 2 The diagram shows the first line 142 and the second line 144 connected to the respective ends of the sensing electrode 120 and the driving electrode 130, respectively. However, the connection structure between the sensing electrode 120 and the driving electrode 130 and the first line 142 and the second line 144 can be varied. For example, in another embodiment, at least one of the first line 142 and the second line 144 can be connected to both ends of the sensing electrode 120 or the driving electrode 130.

[0066] The pad unit 150 may include a plurality of pads 152 for electrically connecting the sensing electrode 120 and the driving electrode 130 to an external driving circuit (e.g., the touch driver 200). The sensor unit 100 and the touch driver 200 may communicate with each other through the pad unit 150.

[0067] Return to reference Figure 1 The touch driver 200 is electrically connected to the sensor unit 100 to send / receive signals required to drive the sensor unit 100. For example, the touch driver 200 can detect touch input by providing a drive signal to the sensor unit 100 and then receiving a sensing signal corresponding to the drive signal from the sensor unit 100. For this purpose, the touch driver 200 may include drive circuitry and sensing circuitry. In some embodiments, the drive circuitry and sensing circuitry may be integrated into a single touch integrated circuit (T-IC), but this disclosure is not limited thereto. Furthermore, in some embodiments, the touch driver 200 and the display driver 400 may be integrated into a single driver integrated circuit.

[0068] In some embodiments, a driving circuit may be electrically connected to the driving electrode 130 of the sensor unit 100 to sequentially provide driving signals to the driving electrode 130 during a touch sensing cycle. In some embodiments, a sensing circuit may be electrically connected to the sensing electrode 120 of the sensor unit 100 to receive sensing signals from the sensing electrode 120 and detect touch input based on the sensing signals.

[0069] The display panel 300 includes a display area 301 and a non-display area 302 surrounding at least one area of ​​the display area 301. The display area 301 may be provided with a plurality of scan lines 310, a plurality of data lines 320, and a plurality of pixels P connected to the scan lines 310 and the data lines 320. The non-display area 302 may be provided with lines for providing a plurality of drive signals and / or drive power for driving the pixels P.

[0070] In this disclosure, the type of display panel 300 is not specifically limited. For example, display panel 300 may be a self-emissive display panel, such as an organic light-emitting display panel (OLED panel). Alternatively, display panel 300 may be a non-self-emissive display panel, such as a liquid crystal display panel (LCD panel), an electrophoretic display panel (EPD panel), or an electrowetting display panel (EWD panel). When display panel 300 is not a self-emissive display panel, the display device may also include a backlight unit for providing light to display panel 300.

[0071] The display driver 400 is electrically connected to the display panel 300 to provide signals required to drive the display panel 300. For example, the display driver 400 may include at least one of a scan driver for providing scan signals to scan lines 310, a data driver for providing data signals to data lines 320, and a timing controller for driving the scan driver and the data driver. In some embodiments, the scan driver, data driver, and / or timing controller may be integrated into a single display integrated circuit (D-IC), but this disclosure is not limited thereto. For example, in another embodiment, at least one of the scan driver, data driver, and timing controller may be disposed within the display panel 300.

[0072] As described above, the display device includes a touch sensor, which enables ease of use. For example, a user can easily control the display device by touching the screen while viewing an image displayed in display area 301.

[0073] Figure 3 A touch sensor according to an embodiment of the present disclosure is shown. For convenience, it will be... Figure 3 The diagram shows one sensing electrode and one driving electrode disposed in a sensor unit, along with a capacitor formed at their intersection. Furthermore, based on the sensing electrode and driving electrode forming the capacitor, [the following will be observed / contained / etc.]. Figure 3 The diagram shows the driving circuit and the sensing circuit.

[0074] refer to Figure 3The sensor unit 100 may include at least one pair of sensing electrodes 120 and driving electrodes 130 forming a capacitor Cse. The driving electrodes 130 are electrically connected to the driving circuit 210 of the touch driver 200, and the sensing electrodes 120 are electrically connected to the sensing circuit 220 of the touch driver 200.

[0075] A driving method for a touch sensor according to this embodiment will be described. During a touch sensing cycle in which the touch sensor is activated, a driving signal Sdr is provided from the driving circuit 210 to the driving electrode 130. In some embodiments, the driving signal Sdr may be an AC signal with a given period, such as a pulse wave.

[0076] like Figure 1 and Figure 2 As shown, when the sensor unit 100 includes multiple driving electrodes 130, the driving circuit 210 can sequentially provide driving signals Sdr to the driving electrodes 130. Then, through the connection of capacitor Cse, sensing signals Sse corresponding to the driving signals Sdr applied to the driving electrodes 130 are output through sensing electrodes 120 respectively. The sensing signals Sse are input to the sensing circuit 220.

[0077] In some implementations, such as Figure 1 and Figure 2 As shown, when the sensor unit 100 includes a plurality of sensing electrodes 120, the sensing circuit 220 may include a plurality of sensing channels (Rx channels) 222 electrically connected to the respective sensing electrodes 120. The sensing circuit 220 may receive sensing signals Sse from the sensing electrodes 120 through the sensing channels 222 respectively.

[0078] Meanwhile, in some embodiments, each of the sensing electrodes 120, together with an amplifier (hereinafter referred to as "Rx amplifier AMP") connected to the sensing electrode 120, may constitute each sensing channel 222. However, for ease of explanation, the case in which the sensing electrodes 120 disposed in the sensor unit 100 are separated from the sensing channels 222 disposed in the sensing circuit 220 will be described below.

[0079] The sensing circuit 220 amplifies, converts, and processes the sensing signal Sse input from the corresponding sensing electrode 120 and detects touch input based on the result. To this end, the sensing circuit 220 may include a plurality of sensing channels 222 corresponding to the corresponding sensing electrodes 120 and at least one analog-to-digital converter (hereinafter referred to as "ADC") 224 and a processor ("MPU") 226 connected to the sensing channels 222.

[0080] In some embodiments, each of the sensing channels 222 may be configured to receive an analog front end (hereinafter referred to as "AFE") of the sensing signal Sse from its corresponding sensing electrode 120. In some embodiments, each of the sensing channels 222 may be implemented as an AFE including at least one Rx amplifier AMP (such as an operational amplifier (OPAMP)).

[0081] In some embodiments, each of the sensing channels 222 may include a first input terminal IN1 (e.g., the inverting input terminal of an Rx amplifier AMP) and a second input terminal IN2 (e.g., the non-inverting input terminal of an Rx amplifier AMP). In some embodiments, the first input terminal IN1 of the sensing channel 222 may be connected to different sensing electrodes 120 among the sensing electrodes 120. That is, the sensing channel 222 and the sensing electrode 120 may be connected one-to-one. In this case, a sensing signal Sse from any of the sensing electrodes 120 may be input to the first input terminal IN1 of each of the sensing channels 222.

[0082] In some embodiments, the second input terminal IN2 of each of the sensing channels 222 can be a reference potential terminal. For example, the second input terminal IN2 of each of the sensing channels 222 can be connected to a reference voltage source, such as a ground (GND) power supply. In this case, each of the sensing channels 222 can amplify and output the sensing signal Sse input to the first input terminal IN1 based on the potential of the second input terminal IN2. That is, each of the sensing channels 222 receives the sensing signal Sse from the corresponding sensing electrode 120 in the sensing electrode 120 through the first input terminal IN1, and amplifies and outputs a signal corresponding to the difference between the voltages of the first input terminal IN1 and the second input terminal IN2, thereby amplifying the sensing signal Sse.

[0083] In some implementations, the Rx amplifier AMP can be implemented as an integrator. In this case, the capacitor C and the reset switch SW can be connected in parallel between the first input terminal IN1 and the output terminal OUT1 of the Rx amplifier AMP.

[0084] The ADC 224 converts the analog signal from each input in the sensing channel 222 into a digital signal. In some embodiments, the number of ADCs 224, which may be equal to or greater than the number of sensing electrodes 120, may correspond one-to-one with the sensing channels 222. Alternatively, in some embodiments, multiple sensing channels 222 may be configured to share a single ADC 224. In this case, a switching circuit for selecting the channel may be additionally provided between the sensing channel 222 and the ADC 224.

[0085] Processor 226 processes the digital signal converted in ADC 224 and detects touch input based on the signal processing results. For example, processor 226 can detect whether a touch input has occurred and the location of the touch input by comprehensively analyzing the signals (amplified and digitally converted sensing signals Sse) input from multiple sensing electrodes 120 via sensing channel 222 and ADC 224. In some embodiments, processor 226 may be implemented as a microprocessor (MPU). In this case, the memory required to drive processor 226 may be additionally provided in sensing circuit 220. However, the configuration of processor 226 is not limited to this. As another example, processor 226 may be implemented as a microcontroller (MCU), etc.

[0086] The touch sensor described above can be combined with a display panel 300, etc. For example, the sensor unit 100 of the touch sensor can be manufactured integrally with the display panel 300, or the sensor unit 100 can be manufactured separately from the display panel 300 and then attached to at least one surface of the display panel 300.

[0087] If the sensor unit 100 is combined with the display panel 300 as described above, a parasitic capacitance is generated between the sensor unit 100 and the display panel 300. For example, the sensing electrode 120 and the driving electrode 130 of the sensor unit 100 may be positioned to overlap with the cathode electrode or common electrode of the display panel 300, and therefore, a parasitic capacitance is generated between the sensor unit 100 and the display panel 300.

[0088] Due to the coupling of parasitic capacitance, noise signals from the display panel 300 can be transmitted to the touch sensor, for example, to the sensor unit 100. For example, noise signals (e.g., common-mode noise) caused by display drive signals applied to the display panel 300 can be introduced into the sensor unit 100.

[0089] For example, in the display device according to this embodiment, the display panel 300 may be an organic light-emitting display panel including a TFE, and the sensor unit 100 may be configured with on-cell type sensor electrodes, which are configured as sensing electrodes 120 and driving electrodes 130 directly formed on a surface (e.g., the upper surface) of the TFE. In this case, the sensing electrode 120, the driving electrode 130, and at least one electrode (e.g., a cathode electrode) disposed in the organic light-emitting display panel are positioned adjacent to each other. Therefore, when the display device is driven, noise signals caused by display driving can be transmitted to the sensor unit 100 with a relatively large intensity.

[0090] Noise signals transmitted to sensor unit 100 cause ripple in the sensing signal Sse, and thus reduce the sensitivity of the touch sensor. Therefore, this disclosure provides various embodiments that can increase the sensitivity of the touch sensor, and their detailed descriptions will be described later.

[0091] Figure 4 A touch sensor according to an embodiment of the present disclosure is shown. Figure 5 It shows according to Figure 4 The distribution characteristics of the noise signal at the location of the sensor unit are shown in the figure. For example, Figure 5 The intensity of the noise signal introduced into the sensing channel through the sensing electrodes corresponding to the respective positions is shown. For convenience, Figure 4 The diagram illustrates a simplified version of each sensing channel. However, the sensing channels according to this embodiment can be configured to... Figure 3 The sensing channels shown are substantially similar or identical. Here, the input signal input to the second input terminal of the sensing channel can be the same as... Figure 3 The input signal to the second input terminal of the sensing channel differs in the implementation method. Figure 4 In, with Figures 1 to 3 Components that are similar to or the same as those in the figures are indicated by the same reference numerals and their detailed descriptions will not be repeated.

[0092] First, refer to Figure 4 The touch sensor according to this embodiment includes a sensor unit 100, a driving circuit 210, and a sensing circuit 220. The sensor unit 100 includes a plurality of sensing electrodes 120 and a plurality of driving electrodes 130. The driving circuit 210 and the sensing circuit 220 are electrically connected to the sensor unit 100. Furthermore, the touch sensor according to this embodiment also includes a plurality of noise detection electrodes (second electrodes) 160 disposed in the sensor unit 100 corresponding to the respective sensing electrodes 120, and a noise control unit 230 connected between the noise detection electrodes 160 and the sensing channel 222. In some embodiments, the noise control unit 230 may include an amplification circuit 234 connected between the noise detection electrodes 160 and the sensing channel 222, and may include an input control unit 232 connected between the amplification circuit 234 and the noise detection electrodes 160. Meanwhile, Figure 4 The diagram shows a case where the noise control unit 230 and the sensing circuit 220 are separately configured, but this disclosure is not limited thereto. For example, at least a portion of the noise control unit 230 may be configured within the sensing circuit 220.

[0093] In embodiments of this disclosure, the sensor unit 100 is divided into at least two regions. For example, the effective region 101 of the sensor unit 100 may be divided into multiple regions according to the intensity (voltage level) distribution of the noise signal. For example, the sensor unit 100 may include a first region (lower region) AA1, a second region (middle region) AA2, and a third region (upper region) AA3 arranged sequentially in a direction from its lower end to its upper end.

[0094] In some embodiments, a large number of sensing electrodes 120 and a large number of driving electrodes 130 may be located in the sensor unit 100. However, for convenience, [the following will be omitted]. Figure 4 Only some sensing electrodes 120 and some driving electrodes 130 are shown in the figure.

[0095] For example, Figure 4 The diagram representatively shows only one sensing electrode 120 among one or more (e.g., multiple) sensing electrodes 120 located in the first region AA1, and the sensing channel 222 connected to said sensing electrode 120 is referred to as the first sensing channel Rx1. Furthermore, Figure 4 The diagram representatively shows only three sensing electrodes 120 among two or more (e.g., multiple) sensing electrodes 120 located in the second region AA2, and sensing channels 222 connected to the sensing electrodes 120 are respectively referred to as the second sensing channel Rx2, the third sensing channel Rx3, and the fourth sensing channel Rx4. Furthermore, Figure 4 The image represents only one of one or more (e.g., multiple) sensing electrodes 120 located in the third region AA3, and the sensing channel 222 connected to the sensing electrode 120 is referred to as the fifth sensing channel Rx5.

[0096] In addition, for convenience, Figure 4 The diagram shows only three drive electrodes 130 passing through the first region AA1 to the third region AA3, and the drive channels connected to the drive electrodes 130 are respectively referred to as the first drive channel Tx1, the second drive channel Tx2, and the third drive channel Tx3. During the touch sensing cycle, the first drive channel Tx1, the second drive channel Tx2, and the third drive channel Tx3 may sequentially provide drive signals Sdr from the drive circuit 210.

[0097] In some implementations, noise components with varying intensities depending on the position of the sensor unit 100 may be included in the sensing signals Sse1 input to the sensing channels Rx1 to Rx5. For example, as Figure 5As shown, the intensity (or amplitude) of the noise signal (hereinafter referred to as "noise voltage Vnoise") detected by the sensor unit 100 can gradually increase as it approaches the second region AA2 and the third region AA3 from the first region AA1.

[0098] For example, when display noise caused by display driving is transmitted to sensor unit 100, the noise component corresponding to the display noise can be included in the sensing signal Sse1 output from sensor unit 100. For example, the display noise transmitted to sensing signal Sse1 can be generated according to the voltage change of the cathode electrode (or common electrode, etc.) located near sensor unit 100. The display noise can have different distribution forms depending on the design structure of display panel 300. However, the display noise can take the form in which the display noise gradually changes according to the position of display area 301 and the effective area 101 corresponding to display area 301.

[0099] Therefore, in embodiments of this disclosure, the sensor unit 100 is divided into multiple regions based on the distribution characteristics of the noise voltage Vnoise detected by the sensor unit 100. For example, the sensor unit 100 may be divided into a first region AA1 to a third region AA3 based on the inflection points shown in the distribution diagram of the noise voltage Vnoise. Furthermore, noise signals Sno1, Sno2, and Sno3 in the corresponding regions are detected using the noise detection electrode 160, and the detected noise signals Sno1, Sno2, and Sno3 are used to eliminate and remove the noise component (ripple) included in the sensing signal Sse1 output from the corresponding sensing electrode 120.

[0100] In some embodiments, each of the first regions AA1 to the third regions AA3 includes at least one pair of sensing electrodes 120 and noise detection electrodes 160. That is, in embodiments of this disclosure, the noise detection electrodes 160 are formed to correspond to the sensing electrodes 120 respectively. However, this disclosure is not limited thereto. For example, in another embodiment, the noise detection electrodes 160 may be formed at a distance (e.g., a predetermined distance) relative to only some of the plurality of sensing electrodes 120.

[0101] In some embodiments, a pair of corresponding sensing electrodes 120 and noise detection electrodes 160 are positioned adjacent to each other in corresponding regions and may be physically and / or electrically separated from each other. For example, at least one pair of sensing electrodes 120 and noise detection electrodes 160 extend in a first direction, with at least one region of the sensing electrode 120 and the noise detection electrode 160 overlapping each other in each region (e.g., each of the first region AA1 to the third region AA3) and insulated from each other by an insulating layer or space. That is, the pair of corresponding sensing electrodes 120 and noise detection electrodes 160 are arranged adjacent to each other. Therefore, noise signals Sno1, Sno2, or Sno3 having substantially equal or similar forms and / or intensities are transmitted to the pair of sensing electrodes 120 and noise detection electrodes 160.

[0102] Simultaneously, the driving electrode 130 intersects with the sensing electrode 120 and the noise detection electrode 160, and can be physically and / or electrically separated from the sensing electrode 120 and the noise detection electrode 160. That is, at least some of the sensing electrode 120, driving electrode 130, and noise detection electrode 160 may overlap and / or intersect each other, but can be insulated from each other by one or more insulating layers or spaces. Therefore, a capacitor can be formed between the sensing electrode 120, driving electrode 130, and noise detection electrode 160.

[0103] In some embodiments, each of the noise detection electrodes 160 may include a plurality of electrode portions 162 arranged along a first direction and at least one connecting line 164 connecting the electrode portions 162 along the first direction. In some embodiments, when each of the noise detection electrodes 160 includes three or more electrode portions 162, each of the noise detection electrodes 160 may include a plurality of connecting lines 164. Meanwhile, the shape and / or configuration of the noise detection electrodes 160 are not limited thereto. For example, in another embodiment, each of the noise detection electrodes 160 may be implemented as an integrated rod-shaped electrode, etc.

[0104] In some embodiments, the first electrode units 122 and electrode portions 162 included in a pair of corresponding sensing electrodes 120 and noise detection electrodes 160 may overlap each other. For example, each of the electrode portions 162 may be located at the center of the region where the first electrode unit 122 corresponding to each electrode portion 162 is located, while each of the electrode portions 162 has an area smaller than the first electrode unit 122. However, this disclosure is not limited thereto. For example, in another embodiment of this disclosure, each first electrode unit 122 may have an opening corresponding to each electrode portion 162, and each electrode portion 162 may be located within the opening formed in each first electrode unit 122 to overlap with the opening. Furthermore, in yet another embodiment of this disclosure, a dummy pattern having a size and shape substantially equal to or similar to that of the electrode portion 162 may be positioned to overlap with the second electrode unit 132, such that the effective area 101 can be viewed substantially uniformly.

[0105] In some embodiments, the electrode portion 162 and / or the connecting line 164 may include at least one of a metallic material, a transparent conductive material, and various other conductive materials, thereby having conductivity. For example, the electrode portion 162 and / or the connecting line 164 may include at least one of a conductive material described as constituting the first electrode unit 122, the first connecting portion 124, the second electrode unit 132, and / or the second connecting portion 134.

[0106] Furthermore, the electrode portion 162 and / or the connecting line 164 may be located on the same layer as the first electrode unit 122, the first connecting portion 124, the second electrode unit 132, and / or the second connecting portion 134. For example, when the first connecting portion 124 is implemented as a bridging pattern located on a layer different from the layers of the first electrode unit 122 and the second electrode unit 132, the electrode portion 162 and the connecting line 164 may be located on the same layer as the first connecting portion 124, while being spaced apart from the first connecting portion 124. However, the materials constituting the electrode portion 162 and / or the connecting line 164 and / or the arrangement of the electrode portion 162 and / or the connecting line 164 can be varied. Furthermore, each of the electrode portion 162 and / or the connecting line 164 may be provided as a single layer or multiple layers, and the structure of each of the electrode portion 162 and / or the connecting line 164 is not specifically limited.

[0107] In some embodiments, noise signals from the noise detection electrodes 160 are transmitted to the input control unit 232 and the amplifier circuit 234 via the third line 146 of the corresponding regions AA1, AA2, and AA3. That is, in embodiments of this disclosure, noise signals Sno1, Sno2, and Sno3 of regions AA1, AA2, and AA3 are detected by connecting the noise detection electrodes 160 to the third line 146 of regions AA1, AA2, and AA3, respectively. Therefore, although multiple noise detection electrodes 160 (the number of which corresponds to the number of sensing electrodes 120) are additionally located in the sensor unit 100, the number of third lines 146 can be reduced or minimized. Therefore, the increase in the size of the ineffective region 102 can be reduced or minimized. Furthermore, the reduction or minimization of the number of third lines 146 simplifies the configuration of the noise control unit 230 connected to the noise detection electrodes 160 via the third line 146. Therefore, the increase in the size of the touch driver 200 and the increase in the manufacturing cost of the touch sensor can be reduced or minimized.

[0108] The noise signals Sno1, Sno2, and Sno3 detected for the area are input to the corresponding sensing channels 222 via the noise control unit 230. For example, the noise signals Sno1, Sno2, and Sno3 controlled by the noise control unit 230 are input as noise compensation signals to the second input terminal IN2 of the corresponding sensing channel 222.

[0109] For example, each of the sensing channels 222 includes a first input terminal IN1 and a second input terminal IN2. In some embodiments, the first input terminal IN1 of the sensing channel 222 is connected to different sensing electrodes 120 among the sensing electrodes 120. Furthermore, the second input terminal IN2 of the sensing channel 222 is connected to a noise control unit 230. Each of the sensing channels 222 may be configured with a differential amplifier for amplifying and outputting a signal corresponding to the voltage difference between the first input terminal IN1 and the second input terminal IN2. For example, each of the sensing channels 222 may amplify and output a sensing signal Sse1 input to the first input terminal IN1 based on the potential of a noise compensation signal CSno input to the second input terminal IN2.

[0110] That is, in the embodiments of this disclosure, the sensing channel 222 does not operate based on a fixed reference potential (e.g., ground potential), but can operate based on the potential of the noise compensation signal CSno. Therefore, the reference potential of the sensing channel 222 can be changed according to the potential (voltage level) of the noise detection electrode 160. According to this embodiment, the noise component included in the sensing signal Sse1 can be eliminated in each of the sensing channels 222. Therefore, a sensing signal Sse2 with noise eliminated (or reduced) from the sensing signal Sse1 can be output.

[0111] For example, in embodiments of this disclosure, to improve or maximize noise cancellation, a noise control unit 230, including an input control unit 232 and an amplifier circuit 234, is connected between the noise detection electrode 160 and the sensing channel 222. In some embodiments, the noise control unit 230 may be configured in the touch driver 200, but the location of the noise control unit 230 is not limited thereto.

[0112] In some embodiments, the input control unit 232 includes a plurality of resistors Rw1, Rw2, and Rw3 corresponding to regions AA1, AA2, and AA3 of the sensor unit 100, respectively. For example, the input control unit 232 may include a first resistor Rw1, a second resistor Rw2, and a third resistor Rw3 corresponding to the noise detection electrodes 160 of the corresponding first region AA1, second region AA2, and third region AA3.

[0113] For example, each of the first resistor Rw1 and the third resistor Rw3 may be connected to at least one noise detection electrode 160 disposed in each of the first region AA1 and the third region AA3, and the second resistor Rw2 may be connected to a plurality of noise detection electrodes 160 disposed in the second region AA2. For example, the first resistor Rw1 may be connected between the noise detection electrode 160 in the first region AA1 and the first input terminal (hereinafter referred to as "third input terminal IN3") of the amplifier circuit 234. In some embodiments, the third input terminal IN3 may be the first input terminal of an amplifier (hereinafter referred to as "noise amplifier AMP2") included in the amplifier circuit 234. Furthermore, the second resistor Rw2 may be connected between the noise detection electrode 160 in the second region AA2 and the third input terminal IN3, and the third resistor Rw3 may be connected between the noise detection electrode 160 in the third region AA3 and the third input terminal IN3.

[0114] The input control unit 232 generates representative values ​​for noise signals Sno1, Sno2, and Sno3 and transmits these representative values ​​to the amplifier circuit 234, thereby effectively removing noise components included in the sensing signal output from the sensing electrode 120 in the sensing channel 222. For example, at least a portion of the noise signals Sno1, Sno2, and Sno3 input to the noise control unit 230 from the first region AA1, the second region AA2, and the third region AA3 may have ripple caused by the effects of clock signals applied to the display panel 300, in addition to display noise (e.g., common-mode noise that actually affects the voltage variation of the sensing electrode 120).

[0115] Therefore, in embodiments of this disclosure, the resistance values ​​of the first resistor Rw1, the second resistor Rw2, and the third resistor Rw3 are set and / or controlled such that the wavelength of the representative noise signal Sno input to the amplifier circuit 234 is approximately as close as possible or feasiblely close to the wavelength of the common-mode noise that mainly constitutes the noise component of the sensing signal Sse1. For example, when the wavelength of the noise signal detected in the first region AA1 (hereinafter referred to as "the first noise signal Sno1") is the wavelength of the optimal noise signal that is approximately as close as possible to the wavelength of the common-mode noise, the resistance values ​​of the second resistor Rw2 and the third resistor Rw3 can be set to be relatively larger than the resistance value of the first resistor Rw1. Therefore, the representative noise signal Sno output from the input control unit 232 can have a form similar to that of the first noise signal Sno1.

[0116] Furthermore, in embodiments of this disclosure, a representative noise signal Sno is generated. This representative noise signal Sno comprehensively reflects the noise signals Sno1, Sno2, and Sno3 detected by the input control unit 232 in the corresponding regions AA1, AA2, and AA3 of the sensor unit 100, and the noise component of the sensing signal Sse1 is removed using the representative noise signal Sno. This allows control to prevent rapid noise compensation changes at the boundaries between regions AA1, AA2, and AA3. The representative noise signal Sno output from the input control unit 232 can be amplified via the amplifier circuit 234 and then input as a noise compensation signal CSno to each of the sensing channels 222.

[0117] In some embodiments, the amplifier circuit 234 may include at least one noise amplifier AMP2 and a plurality of output resistors VR1 to VR5 connected to the output terminal OUT2 of the noise amplifier AMP2. In some embodiments, the first input terminal (i.e., the third input terminal IN3) of the noise amplifier AMP2 may be commonly connected to the corresponding ends of the first resistor Rw1, the second resistor Rw2, and the third resistor Rw3, and the second input terminal (hereinafter referred to as the "fourth input terminal IN4") of the noise amplifier AMP2 may be connected to a reference voltage source Vref. In some embodiments, the third input terminal IN3 and the fourth input terminal IN4 may be inverting input terminals and non-inverting input terminals, respectively, but this disclosure is not limited thereto. For example, in another embodiment, the third input terminal IN3 and the fourth input terminal IN4 may be configured as a non-inverting input terminal and an inverting input terminal, respectively. Meanwhile, Figure 4The resistors Ra and Rb represent the equivalent input resistors / resistors formed between the noise amplifier AMP2 and the reference voltage source Vref. The noise amplifier AMP2 amplifies the representative noise signal Sno input from the input control unit 232 and outputs the representative noise signal Sno to each of the sensing channels 222.

[0118] In some implementations, multiple output resistors VR1 to VR5 may be connected in parallel to the output terminal OUT2 of the noise amplifier AMP2. For example, each of the output resistors VR1 to VR5 may be connected between the output terminal OUT2 of the noise amplifier AMP2 and the reference voltage source Vref.

[0119] In some implementations, output resistors VR1 to VR5 may be connected to the second input terminal IN2 of different sensing channels 222. For example, output resistors VR1 to VR5, which are equal in number to or greater in number than sensing channels 222, may be provided in amplifier circuit 234 so that sensing channels 222 can be connected one-to-one to output resistors VR1 to VR5.

[0120] As described above, if the sensing channels 222 are connected to different output resistors VR1 to VR5, the magnitude (amplitude) of the noise compensation signal CSno input to each of the sensing channels 222 can be easily controlled to suit the magnitude (amplitude) of the noise component included in the sensing signal Sse1 input to each of the sensing channels 222. That is, according to this embodiment, the resistance value of each of the output resistors VR1 to VR5 can be set and / or controlled independently, so that the noise component of the sensing signal Sse1 can be effectively removed (or reduced) in each of the sensing channels 222.

[0121] In some embodiments, each of the output resistors VR1 to VR5 may be configured as a variable resistor. In this case, the resistance values ​​of the output resistors VR1 to VR5 can be changed as appropriate. However, this disclosure is not limited thereto. For example, in another embodiment, each of the output resistors VR1 to VR5 may have a fixed resistance value. For example, each of the output resistors VR1 to VR5 may have a resistance value suitable for noise cancellation that is fixed during the manufacturing process of the display device.

[0122] The sensing signal Sse2, amplified as it passes through sensing channel 222 and having noise removed from the sensing signal Sse1, can be input to at least one ADC 224 to be converted into a digital signal, and then input to processor 226. Processor 226 can detect touch input based on the digital signal output from ADC 224.

[0123] According to this embodiment, noise (e.g., common-mode noise) introduced into the sensor unit 100 is detected using a noise detection electrode 160, and a noise compensation signal CSno suitable for improving or maximizing noise cancellation in each of the sensing channels 222 is generated using a noise control unit 230. Furthermore, the noise compensation signal CSno is output to each of the sensing channels 222. Then, each of the sensing channels 222 is driven in a differential mode corresponding to the voltage difference between the first input terminal IN1 and the second input terminal IN2, thereby removing the noise component included in the sensing signal Sse1. Therefore, display noise introduced into the sensor unit 100 of the touch sensor from the display panel 300, etc., can be effectively removed or reduced. According to this embodiment, when the signal-to-noise ratio (SNR) of the touch sensor increases, touch sensor malfunctions can be reduced or minimized, and the sensing sensitivity of the touch sensor can be improved.

[0124] Furthermore, according to this embodiment, the sensor unit 100 is divided into multiple regions (e.g., first region AA1 to third region AA3) based on the distribution of noise signals, and noise signals Sno1, Sno2, and Sno3 are detected for their respective regions AA1 to AA3. Therefore, the noise detection electrode 160 and the noise control unit 230 can be configured effectively. Accordingly, due to the addition of the noise detection electrode 160 and the noise control unit 230, the increase in the size of the ineffective region 102 and the touch driver 200 can be reduced or minimized, and the corresponding manufacturing cost of the touch sensor can be reduced or minimized.

[0125] The embodiments disclosed herein can be effectively applied to display devices and the like, where there is a short distance between the sensor unit 100 and the display panel 300. For example, this embodiment can be effectively applied to improve touch sensitivity in on-chip display devices and the like, where the sensing electrode 120 and driving electrode 130 are directly formed on the upper substrate or TFE of the display panel 300, making them sensitive to noise. Furthermore, because this embodiment provides an efficient structure for the noise detection electrode 160 and the noise control unit 230, this embodiment can be effectively applied to large-size display devices and the like. However, the scope of this disclosure is not limited thereto, and it will be apparent that this embodiment can be applied to various types of display devices or electronic devices.

[0126] Figure 6 and Figure 7 Each showed the same as Figure 4 The embodiments related to the sensor unit are shown in the diagram. For example, Figure 7 It shows Figure 6 Variations of the implementation method. Figure 8A It shows along Figure 6 An example of a cross section taken by line I-I'. Figure 8B It shows along Figure 6 Example of a section cut by line II-II'. Figure 8C An example cross-section of a display device according to an embodiment of the present disclosure is shown. For example, Figure 8C An embodiment related to the arrangement structure of the sensor unit and the display panel is shown. Figures 6 to 8C In, with Figure 4 Components that are similar to or the same as those in the accompanying drawings are indicated by the same reference numerals and their detailed descriptions will not be repeated.

[0127] First, refer to Figures 6 to 8B In some embodiments, the first electrode unit 122 and the second electrode unit 132 may be located on the same layer. Furthermore, one of the first connecting portion 124 and the second connecting portion 134 may be located on the same layer as the first electrode unit 122 and the second electrode unit 132. For example, the second connecting portion 134 may be integrally connected to the second electrode unit 132.

[0128] Furthermore, in some embodiments, the first connection portion 124 and the noise detection electrode 160 may be disposed on the same layer and spaced apart from each other. For example, the first connection portion 124 and the electrode portion 162 may be disposed on the same layer, and the connecting line 164 may be integrally connected to the electrode portion 162.

[0129] In some embodiments, the sensing electrode 120 and the noise detection electrode 160 can be insulated from each other by an insulating layer 170 disposed between them. Furthermore, the first connection portion 124 and the second connection portion 134 can also be insulated from each other by the insulating layer 170. In this case, the first connection portion 124 can be connected to the first electrode unit 122 through the first contact hole CH1.

[0130] The position, shape, and / or structure of each of the first electrode unit 122, the second electrode unit 132, the electrode section 162, and the connecting line 164 can be modified and implemented in various ways. For example, such as Figure 7 As shown, at least some of the first electrode unit 122, the second electrode unit 132, the electrode portion 162, and the connecting line 164 may be implemented using a grid-type electrode and / or a grid-type pattern, each of which includes multiple conductive fine lines FL.

[0131] Furthermore, in some implementation methods... Figure 8A and Figure 8B The illustration shows a case where the first connection portion 124 is located on the lower layer of the layer where the first electrode unit 122 and the second electrode unit 132 are located, but this disclosure is not limited thereto. For example, in another embodiment, the first connection portion 124 may be located on the upper layer of the layer where the first electrode unit 122 and the second electrode unit 132 are located.

[0132] Furthermore, in some implementation methods... Figure 8A and Figure 8B The illustration shows an electrode portion 162 located on a lower layer (e.g., the layer where the first electrode unit 122 and the second electrode unit 132 are located) than the layer where the first connecting portion 124 is located; however, this disclosure is not limited thereto. For example, in another embodiment, the electrode portion 162 may be located on the same layer as the first electrode unit 122 and the second electrode unit 132. For example, the electrode portion 162 may be located in a corresponding opening formed by opening the center of the first electrode unit 122. In this case, the electrode portion 162 and the connecting line 164 may be located on different layers, and additional contact holes for connecting the electrode portion 162 and the connecting line 164 may be formed in the insulating layer 170.

[0133] In the embodiments described above, each of the electrode portions 162 is located inside its corresponding first electrode unit 122. Therefore, interference between the drive electrode 130 and the noise detection electrode 160 can be reduced or minimized.

[0134] Meanwhile, in some embodiments, the substrate 110, which serves as the base member of the sensor unit 100, can be a TFE (Transformer Electrode Fabric) of an organic light-emitting display panel. In this case, the substrate 110 can be configured as a multilayer comprising at least one organic layer and at least one inorganic layer, or as a single layer comprising an organic-inorganic mixed material. For example, the substrate 110 can be configured as a multilayer comprising at least two inorganic layers and at least one organic layer interposed between the inorganic layers. In a display device where the substrate 110 is implemented as a TFE of an organic light-emitting display panel, the sensor pattern constituting the sensor unit 100 and the display pattern constituting the display panel 300 can be located on different surfaces of the substrate 110.

[0135] In the following text, reference will be made to Figure 8C An embodiment describing the arrangement structure of the sensor pattern and the display pattern is provided. For convenience, the structure of the sensor unit 100 is shown as... Figure 8A The implementation methods shown are similar, but not limited to them. Figure 8C The detailed description of the structure of the sensor unit 100 described above will not be repeated here.

[0136] refer to Figure 8C The sensor unit 100 can be directly formed and / or disposed on the substrate / TFE 110 of the display panel (e.g., an organic light-emitting display panel) 300. Therefore, a sensor-display integrated organic light-emitting display panel can be provided. That is, in some embodiments, the substrate 110 described above can be the TFE of the display panel 300, and therefore, they are indicated by the same reference numerals. For convenience, Figure 8CThe image shows only the light-emitting device (e.g., organic light-emitting diode) OLED and a thin-film transistor TFT connected to the light-emitting device OLED, which are arranged in the pixel pattern in each pixel area of ​​the display panel 300.

[0137] In some embodiments, the display panel 300 includes a first substrate 330, a light-emitting device (OLED) disposed on one surface of the first substrate 330, and a TFE 110 disposed on the OLED to at least cover the OLED. Furthermore, in some embodiments, the display panel 300 may also include at least one thin-film transistor (TFT) connected to the OLED. In some embodiments, the TFT may be located between the first substrate 330 and the OLED. Additionally, the display panel 300 may also include at least one power line, at least one signal line, and / or at least one capacitor, etc.

[0138] In some embodiments, the first substrate 330 may be a rigid substrate or a flexible substrate, and the material of the first substrate 330 is not specifically limited. For example, the first substrate 330 may be a flexible thin film substrate. A buffer layer BFL may be disposed on one surface of the first substrate 330. The buffer layer BFL prevents impurities from diffusing from the first substrate 330 and improves the flatness of the first substrate 330. In some embodiments, the buffer layer BFL may be a single layer, but it may also be a multilayer comprising at least two layers. In some embodiments, the buffer layer BFL may be an inorganic insulating layer made of an inorganic material. For example, the buffer layer BFL may be formed from silicon nitride, silicon oxide, silicon oxide nitride, etc. When the buffer layer BFL is multilayered, the layers may be formed from the same material or from different materials. Meanwhile, in another embodiment, the buffer layer BFL may be omitted.

[0139] A thin-film transistor (TFT) is disposed on a buffer layer (BFL). The TFT includes an active layer (ACT), a gate electrode (GE), a source electrode (SE), and a drain electrode (DE). In some embodiments, the active layer (ACT) may be disposed on the buffer layer (BFL) and formed of a semiconductor material. For example, the active layer (ACT) may be a semiconductor pattern made of polycrystalline silicon, amorphous silicon, oxide semiconductor, etc., and may be formed of an undoped or doped semiconductor layer. Alternatively, one region of the active layer (ACT) may be undoped, while another region of the active layer (ACT) may be doped.

[0140] In some embodiments, the gate insulating layer GI may be disposed on the active layer ACT, and the gate electrode GE may be disposed on the gate insulating layer GI. Furthermore, the interlayer insulating layer IL may be disposed on the gate electrode GE, and the source electrode SE and drain electrode DE may be disposed on the interlayer insulating layer IL. The source electrode SE and drain electrode DE may be connected to different regions of the active layer ACT through a second contact hole CH2 passing through the gate insulating layer GI and the interlayer insulating layer IL, respectively.

[0141] In some embodiments, a passivation layer PSV may be disposed above the source electrode SE and the drain electrode DE. The passivation layer PSV may cover the thin-film transistor TFT and planarize the top surface of the thin-film transistor TFT.

[0142] In some embodiments, the light-emitting device (OLED) may be disposed on the passivation layer PSV. The OLED may include a first electrode ELT1, a second electrode ELT2, and an emitter layer EML interposed between the first electrode ELT1 and the second electrode ELT2. In some embodiments, the first electrode ELT1 of the OLED may be an anode electrode, but this disclosure is not limited thereto. The first electrode ELT1 of the OLED is connected to an electrode, for example, through a third contact hole CH3 passing through the passivation layer PSV, to the drain electrode DE of the thin-film transistor (TFT).

[0143] A pixel defining layer (PDL) defining each pixel region (or the light-emitting region of each pixel) is disposed on one surface of a first substrate 330 on which the first electrode ELT1 of the light-emitting device OLED is formed. In some embodiments, the pixel defining layer (PDL) may expose the upper surface of the first electrode ELT1 and protrude from the first substrate 330 along the perimeter of each pixel region.

[0144] An emitter layer EML is disposed in a pixel region surrounded by a pixel defining layer PDL. The emitter layer EML may be located on the exposed surface of the first electrode ELT1. In some embodiments, the emitter layer EML may have a multilayer thin film structure including at least a light-generating layer. For example, the emitter layer EML may include a hole injection layer, a hole transport layer, a light-generating layer, a hole blocking layer, an electron transport layer, and an electron injection layer. In some embodiments, the color of the light generated from the emitter layer EML may be one of red, green, blue, and white, but this disclosure is not limited thereto.

[0145] In some embodiments, the second electrode ELT2 of the OLED light-emitting device may be located on the emissive layer EML. In some embodiments, the second electrode ELT2 of the OLED light-emitting device may be a cathode electrode, but this disclosure is not limited thereto.

[0146] In some embodiments, the TFE 110 covering the second electrode ELT2 of the OLED can be disposed on the second electrode ELT2 of the OLED. When the display area 301 of the display panel 300 is sealed with TFE 110, the thickness of the display panel 300 is reduced, thereby ensuring flexibility.

[0147] In some embodiments, the TFE 110 may be configured as a multilayer or a single-layer structure. For example, the TFE 110 may include a first inorganic layer 111 and a second inorganic layer 113 that overlap each other, and an organic layer 112 interposed between the first inorganic layer 111 and the second inorganic layer 113. Alternatively, in another embodiment, the TFE 110 may be implemented as a single layer that compositely comprises organic and inorganic materials.

[0148] In some embodiments, the organic layer 112 may have a thickness greater than that of the first inorganic layer 111 and the second inorganic layer 113. For example, the organic layer 112 may have a thickness of about 4 μm to about 10 μm, and each of the first inorganic layer 111 and the second inorganic layer 113 may have a thickness of about to approximately The thickness.

[0149] In the display device according to the embodiments described above, the display panel 300 is implemented as an organic light-emitting display panel including a TFE 110, and the sensor pattern of the sensor unit 100 is directly formed on the TFE 110. For example, the sensing electrode 120, the driving electrode 130, and / or the noise detection electrode 160 may be directly formed on the TFE 110.

[0150] In this configuration, the sensor pattern is located near the display pattern (e.g., the second electrode ELT2 of the OLED) disposed in the display panel 300. Therefore, display noise (e.g., common-mode noise) from the second electrode ELT2 of the OLED can be introduced into the sensor pattern. In this disclosure, the noise detection electrode 160 and the noise control unit 230 are configured as described above, thereby effectively eliminating display noise. Therefore, even when... Figures 8A to 8C When a display device integrating a sensor and display panel is implemented as shown, and the organic layer 112 of the TFE 110 is formed to have a thickness of approximately 10 μm or less, the sensitivity of the touch sensor can be sufficiently ensured. For example, when the noise reduction / noise cancellation structure according to this embodiment is applied, the sensitivity of the touch sensor can be sufficiently ensured even when the overall thickness of the TFE 110 is set to 10 μm or less.

[0151] Figure 9 A touch sensor according to an embodiment of the present disclosure is shown. For example, Figure 9It shows Figure 4 Variations of the embodiments shown are illustrated. Figure 9 In, with Figure 4 Components that are similar to or the same as those in the accompanying drawings are indicated by the same reference numerals and their detailed descriptions will not be repeated.

[0152] refer to Figure 9 The second input terminal IN2 of at least one of the sensing channels 222 can be connected between the second input terminals IN2 of two different sensing channels 222 (e.g., different sensing channels 222 connected to sensing electrodes 120 in the same region). For example, a third sensing channel Rx3 connected to any of the sensing electrodes 120 located in the middle of the second region AA2 can be connected between the second input terminals IN2 of vertically adjacent sensing channels (e.g., second sensing channel Rx2 and fourth sensing channel Rx4).

[0153] For example, in some embodiments, a voltage divider 228, including at least a first voltage divider resistor Rd1 and a second voltage divider resistor Rd2, may be disposed between the second input terminals IN2 of the second sensing channel Rx2 and the fourth sensing channel Rx4, and the second input terminal IN2 of the third sensing channel Rx3 may be connected to the output node OUTd of the voltage divider 228. Here, the first voltage divider resistor Rd1 may be connected between the second input terminals IN2 of the second sensing channel Rx2 and the third sensing channel Rx3, and the second voltage divider resistor Rd2 may be connected between the second input terminals IN2 of the third sensing channel Rx3 and the fourth sensing channel Rx4. Therefore, a noise compensation signal CSno corresponding to the intermediate value of the noise compensation signal CSno input to the second input terminals IN2 of the second sensing channel Rx2 and the fourth sensing channel Rx4 may be input to the second input terminal IN2 of the third sensing channel Rx3.

[0154] The intensity of the noise introduced into the sensor unit 100 has such a form that the noise intensity gradually changes according to the position within the sensor unit 100. Therefore, without setting... Figure 4 In the case of the third output resistor VR3, when the voltage input to the second input terminal IN2 of the second sensing channel Rx2 and the fourth sensing channel Rx4 is divided and the intermediate value of the voltage is provided to the second input terminal IN2 of the third sensing channel Rx3, the noise component included in the sensing signal Sse1 input to the third sensing channel Rx3 can be effectively removed.

[0155] Similarly, when a larger number of sensing electrodes 120 are arranged in the second region AA2, the second input terminals IN2 of the sensing channels 222 of the multiple sensing electrodes 120 are connected between the second input terminals IN2 of the different sensing channels 222 via a voltage divider 228, thereby reducing the number of output resistors VR1, VR2, etc. Furthermore, when multiple sensing electrodes 120 are arranged in each of the first region AA1 and / or the third region AA3, the above-described method is applied to the first region AA1 and / or the third region AA3, thereby effectively removing display noise introduced into each sensing electrode 120 of the sensor unit 100 while reducing the number of output resistors VR1, VR2, etc. provided in the amplifier circuit 234.

[0156] According to the embodiments described above, noise introduced into the sensor unit 100 from the display panel 300, etc., can be effectively removed or reduced while simplifying the configuration of the amplifier circuit 234. Therefore, it is possible to prevent an increase in the size of the touch driver 200 and an increase in the manufacturing cost of the touch sensor.

[0157] Figure 10 A touch sensor according to an embodiment of the present disclosure is shown. For example, Figure 10 It shows Figure 4 Variations of the embodiments shown. Figure 10 In, with Figure 4 Components that are similar to or the same as those in the accompanying drawings are indicated by the same reference numerals, and their detailed descriptions will be omitted.

[0158] refer to Figure 10 The amplifier circuit 234 may include multiple noise amplifiers AMP21, AMP22, and AMP23. For example, the amplifier circuit 234 may include a first noise amplifier AMP21, a second noise amplifier AMP22, and a third noise amplifier AMP23 corresponding to the first region AA1, the second region AA2, and the third region AA3 of the sensor unit 100, respectively. In this case, the first resistor Rw1, the second resistor Rw2, and the third resistor Rw3 of the input control unit 232 may be connected to the first input terminals IN31, IN32, and IN33 of the first noise amplifier AMP21, the second noise amplifier AMP22, and the third noise amplifier AMP23, respectively.

[0159] For example, one end of the first resistor Rw1 can be connected to at least one sensing electrode 120 located in the first region AA1 and to the first input terminal of the first noise amplifier AMP21 (hereinafter referred to as "the thirty-first input terminal IN31"), and the other end of the first resistor Rw1 can be connected to the reference voltage source Vref. Furthermore, one end of the second resistor Rw2 can be connected to multiple sensing electrodes 120 located in the second region AA2 and to the first input terminal of the second noise amplifier AMP22 (hereinafter referred to as "the thirty-second input terminal IN32"), and the other end of the second resistor Rw2 can be connected to the reference voltage source Vref. Furthermore, one end of the third resistor Rw3 can be connected to at least one sensing electrode 120 located in the third region AA3 and to the first input terminal of the third noise amplifier AMP23 (hereinafter referred to as "the thirty-third input terminal IN33"), and the other end of the third resistor Rw3 can be connected to the reference voltage source Vref.

[0160] In some embodiments, the second input terminals (hereinafter referred to as "Input Terminal IN41", "Input Terminal IN42", and "Input Terminal IN43" respectively) of the first noise amplifier AMP21, the second noise amplifier AMP22, and the third noise amplifier AMP23 can be connected to the reference voltage source Vref via corresponding input resistors Rb1, Rb2, and Rb3. Furthermore, the output terminals OUT21, OUT22, and OUT23 of the first noise amplifier AMP21, the second noise amplifier AMP22, and the third noise amplifier AMP23 can be connected via at least one output resistor (at least one of VR1 to VR5) to the second input terminal IN2 of at least one sensing channel 222 connected to the sensing electrodes 120 of the corresponding first region AA1, second region AA2, and third region AA3. In some embodiments, one end of each of the output resistors VR1 to VR5 can be connected to the output terminal OUT21, OUT22, or OUT23 of any one of the first noise amplifier AMP21, the second noise amplifier AMP22, and the third noise amplifier AMP23, and the other end of each of the output resistors VR1 to VR5 can be connected to the reference voltage source Vref.

[0161] In the embodiments described above, the first noise amplifier AMP21, the second noise amplifier AMP22, and the third noise amplifier AMP23 are configured to correspond to corresponding regions of the sensor unit 100 (e.g., corresponding first region AA1, second region AA2, and third region AA3). In this case, although the magnitude (amplitude) of each noise signal Sno1, Sno2, or Sno3 increases, it is easy to set an optimal noise gain for each region AA1, AA2, or AA3, making it possible to effectively remove display noise. Furthermore, the resistance values ​​of the output resistors VR1 to VR5 are set differently according to the actual position of the sensing electrode 120 in each of regions AA1, AA2, and AA3, so that an optimal noise compensation signal CSno can be generated.

[0162] Figure 11 A touch sensor according to an embodiment of the present disclosure is shown. For example, Figure 11 It shows Figure 10 Variations of the embodiments shown. Figure 11 In, with Figure 10 Components that are similar to or the same as those in the figures are indicated by the same reference numerals and their detailed descriptions will not be repeated.

[0163] refer to Figure 11 The output resistors corresponding to the respective regions AA1, AA2, and AA3 (e.g., first output resistor VR1, second output resistors VR2 through VR4, and fifth output resistor VR5) can be connected to each other for continuous engagement. For example, one end of the first output resistor VR1 can be connected to the output terminal OUT21 of the first noise amplifier AMP21, and the other end of the first output resistor VR1 can be connected to the output terminal OUT22 of the second noise amplifier AMP22. Furthermore, the corresponding ends of the second output resistors VR2 through VR4 can be connected together to the output terminal OUT22 of the second noise amplifier AMP22, and the other ends of the second output resistors VR2 through VR4 can be connected together to the output terminal OUT23 of the third noise amplifier AMP23. Additionally, one end of the fifth output resistor VR5 can be connected to the output terminal OUT23 of the third noise amplifier AMP23, and the other end of the fifth output resistor VR5 can be connected to the reference voltage source Vref. Meanwhile, in another embodiment, when the sensor unit 100 is divided into only two regions (e.g., the first region AA1 and the second region AA2), the other ends of the second output resistor VR2 to the fourth output resistor VR4 can be connected together to the reference voltage source Vref.

[0164] According to the embodiments described above, rapid noise compensation changes can be prevented at the boundaries between regions AA1, AA2 and AA3 of the sensor unit 100.

[0165] According to this disclosure, display noise introduced from the display panel 300 into the sensor unit 100 of the touch sensor can be effectively removed or reduced. Therefore, touch sensor malfunctions can be reduced or minimized, and the sensing sensitivity of the touch sensor can be improved.

[0166] Furthermore, according to this disclosure, the sensor unit 100 is divided into multiple regions (e.g., first region AA1 to third region AA3) based on the distribution characteristics of the noise signal, and the noise detection electrode 160 and the noise control unit 230 can be effectively configured corresponding to the multiple regions. Therefore, the increase in the size of the ineffective region 102 and the touch driver 200, as well as the increase in the manufacturing cost of the touch sensor, can be reduced or minimized.

[0167] Exemplary embodiments have been disclosed herein, and while specific terminology has been used, it is used and interpreted in a general and descriptive sense only and is not intended to be limiting. In some instances, as will be apparent to those skilled in the art upon filing this application, features, characteristics, and / or elements described in connection with particular embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless expressly indicated otherwise. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of this disclosure as set forth in the appended claims and their functional equivalents.

Claims

1. A display device, including: A display panel includes a display area and a thin-film encapsulation layer covering the display area, wherein a plurality of pixels are located in the display area; A sensor unit is formed on the thin-film encapsulation layer and includes an effective area that overlaps with the display area; as well as The touch driver is electrically connected to the sensor unit. The sensor unit includes: A first electrode, extending in a first direction and including a plurality of first electrode units electrically connected to each other; and The second electrode includes a plurality of electrode portions that overlap with and are electrically connected to the first electrode unit. The touch driver is configured to generate a noise-canceling sensing signal by compensating for a sensing signal received from the first electrode based on a noise signal received from the second electrode.

2. The display device according to claim 1, wherein, The effective region includes a first region and a second region, the first region including at least one pair of the first electrode and the second electrode, and the second region including at least two pairs of the first electrode and the second electrode. The noise signal includes a first noise signal detected from the first region and a second noise signal detected from the second region.

3. The display device according to claim 2, wherein, The touch driver includes: Multiple sensing channels, each including a first input terminal and a second input terminal, wherein the first input terminal of the sensing channel is connected to different first electrodes in the first electrode; An amplifier circuit is connected between the second electrode and the second input terminal of the sensing channel; and An input control unit is connected between the amplifier circuit and the second electrode. The input control unit includes a first resistor connected to the second electrode of the first region and a second resistor that is also connected to the second electrode of the second region.

4. The display device according to claim 3, wherein, The input control unit is configured to generate a representative noise signal that approximates the common-mode noise of the sensed signal from the first noise signal and the second noise signal by adjusting the values ​​of the first resistor and the second resistor.

5. The display device according to claim 4, wherein, The amplifier circuit is configured to amplify the representative noise signal and to provide a noise compensation signal corresponding to the noise included in the sensing signal input to each of the plurality of sensing channels.

6. The display device according to claim 5, wherein, Each of the plurality of sensing channels is configured to generate the noise-reduced sensing signal by amplifying a signal corresponding to the difference between the voltage of the noise compensation signal input to the second input terminal and the voltage of the sensing signal input to the first input terminal.

7. The display device according to claim 3, wherein, The amplifier circuit includes: An amplifier, including an input terminal commonly connected to a first terminal of the first resistor and a first terminal of the second resistor; and Multiple output resistors connected in parallel are connected to the output terminals of the amplifier and are respectively connected to different sensing channels among the multiple sensing channels.

8. The display device according to claim 7, in, The first resistor is connected to the second electrode of the first region and the input terminal of the amplifier, and The second resistor is connected between the second electrode in the second region and the input terminal of the amplifier.

9. The display device according to claim 7, wherein, The second input terminal of the sensing channel is connected to the corresponding output resistor in the output resistor.

10. The display device according to claim 7, wherein, The second region includes at least three first electrodes, and Wherein, the second input terminal of the sensing channel among the plurality of sensing channels that is connected to any one of the first electrodes of the first electrode of the second region is connected between the second input terminals of the sensing channels among the plurality of sensing channels that are connected to two different first electrodes of the first electrode of the second region.

11. The display device according to claim 7, wherein, Each of the output resistors includes a variable resistor.

12. The display device according to claim 3, wherein, The amplifier circuit includes: A first amplifier includes an input terminal connected to the second electrode of the first region and a first end of the first resistor, and an output terminal connected to the second input terminal of a sensing channel among the plurality of sensing channels connected to the first electrode of the first region; and The second amplifier includes an input terminal connected to the second electrode and the first end of the second resistor in the second region, and an output terminal connected to the second input terminal of the sensing channel in the plurality of sensing channels that is connected to the first electrode in the second region.

13. The display device according to claim 12, wherein, The amplifier circuit includes: A first output resistor is connected between the output terminal of the first amplifier and the second input terminal of the sensing channel of the plurality of sensing channels that is connected to the first electrode of the first region; and Multiple second output resistors are connected between the output terminal of the second amplifier and the second input terminal of the sensing channel of the multiple sensing channels that is connected to the first electrode of the second region.

14. The display device according to claim 13, wherein, The first terminal of the first output resistor and the first terminal of the second output resistor are connected to a reference voltage source.

15. The display device according to claim 13, wherein, The first end of the first output resistor is connected to the output terminal of the first amplifier, and the second end of the first output resistor is connected to the output terminal of the second amplifier.

16. The display device according to claim 1, wherein, The first electrode further includes a first connecting portion, which connects two adjacent first electrode units among the plurality of first electrode units to each other along the first direction. The second electrode further includes a connecting line that connects two adjacent electrode portions among the plurality of electrode portions along the first direction, the connecting line being insulated from the first connecting portion. Wherein, the first electrode unit and the electrode portion are located in different layers, and The first connecting part and the connecting line are located on the same layer.

17. The display device according to claim 16, wherein, The sensor unit further includes a third electrode that extends in a second direction to intersect with the first and second electrodes. The third electrode includes a plurality of second electrode units extending in the second direction and a second connecting portion connecting two adjacent second electrode units to each other along the second direction. The first connecting part and the second connecting part are located in different layers.

18. The display device according to claim 17, wherein, The second electrode unit and the second connection portion are located in the same layer.

19. The display device according to claim 17, further comprising an insulating layer between the first connecting portion and the second connecting portion.

20. The display device according to claim 17, wherein, The first electrode unit, the electrode portion, and the second electrode unit include a metal mesh structure.

Images