Pen detection unit and display device including the same

Abstract

A pen detection unit and a display device including the pen detection unit are disclosed. The pen detection unit includes a pen detection panel and a pen driving circuit. The pen detection panel includes a plurality of sensor units, and each of the sensor units includes a first loop antenna and at least one transistor connected to the first loop antenna. The pen driving circuit detects the position of the pen based on a first electromagnetic field generated through the first loop antenna in a first mode, and receives a sensing signal based on an external electromagnetic induction device and transmits the sensing signal to a power supply unit in a second mode different from the first mode.

Description

[0001] This application claims the priority and benefit of Korean Patent Application No. 10-2020-0006812, filed on Jan. 17, 2020, which is hereby incorporated by reference in its entirety for all purposes as if fully set forth herein. TECHNICAL FIELD

[0002] Exemplary embodiments / modes of the invention generally relate to a pen detection unit and a display device including the same. BACKGROUND ART

[0003] Various types of display devices, such as liquid crystal displays (LCDs) and organic light emitting displays (OLEDs), have been used. An OLED displays an image by using an organic light emitting diode in which light is generated through the recombination of electrons and holes.

[0004] A display device may include various input modules, and the input modules may include, for example, a touch sensing module for sensing a touch input by a user's finger or the like, a fingerprint sensing module for sensing a user's fingerprint, a pen sensing module for sensing an input by a stylus pen, and the like.

[0005] In addition, recent display devices (or electronic devices including a display device) may include modules providing various functions, and the modules may include, for example, a charging module using wireless charging technology, a communication module using near field communication (NFC) technology, a payment module using magnetic secure transmission (MST) technology, and the like.

[0006] When antennas for various modules, such as a wireless charging module, an NFC module, and an MST module, are separately provided in a display device, the thickness of the display device becomes thick and the manufacturing cost of the display device increases.

[0007] The above information disclosed in this background art section is only for understanding the background of the inventive concept, and thus, it may include information that does not constitute the prior art. SUMMARY OF THE INVENTION

[0008] Exemplary embodiments of the invention provide a display device capable of reducing its thickness and manufacturing cost.

[0009] Additional features of the invention will be set forth in the description below, and in part will be apparent from the description, or may be learned by practice of the invention.

[0010] Exemplary embodiments of the invention provide a pen detection unit, the pen detection unit comprising: a pen detection panel including a plurality of pen sensor portions each including a first loop antenna and at least one transistor connected to the first loop antenna; and a pen driving circuit configured to detect the position of a pen based on a first electromagnetic field generated by the first loop antenna in a first mode, and in a second mode different from the first mode, receive a sensing signal based on an external electromagnetic induction device and transmit the sensing signal to a power supply unit.

[0011] The pen may include a resonant circuit configured with at least one capacitor and at least one inductor.

[0012] The power supply unit may include at least one of a wireless charging module, a near field communication module, and a magnetic safety transmission module.

[0013] The pen detection panel may further include: a first scan line connected to the gate electrodes of the at least one transistor; and a readout line connected to the first loop antenna. The pen sensor portions may be respectively disposed in regions defined by the first scan line and the readout line.

[0014] The first loop antenna may have a spiral shape in a plane.

[0015] The spiral shape may have a width of 1 mm to 10 mm.

[0016] The pen detection panel may further include: a second scan line; and a driving line, wherein the at least one transistor may include: a first transistor including a first electrode connected to the driving line and a gate electrode connected to the first scan line; and a second transistor including a first electrode connected to a first driving voltage line, a second electrode connected to one end of the first loop antenna, and a gate electrode connected to the second electrode of the first transistor.

[0017] The at least one transistor may further include a third transistor including a first electrode connected to the one end of the first loop antenna, a second electrode connected to the readout line, and a gate electrode connected to the second scan line.

[0018] The pen driving circuit may include: a pen detection block configured to detect the position of the pen based on the first electromagnetic field; and a switch block configured to connect the readout line to the pen detection block in the first mode and connect the readout line to the power supply unit in the second mode.

[0019] The pen driving circuit may include: a first switch configured to connect the readout line to the pen detection block based on a first selection signal; and a second switch configured to connect the readout line to the power supply unit based on a second selection signal.

[0020] In a first period of a first mode, a scan signal having a turn-on voltage level may be provided to a first scan line, and a drive signal having a plurality of pulses may be provided to a drive line.

[0021] In a second period of the first mode, a scan signal having a turn-on voltage level may be provided to a second scan line.

[0022] In a third period corresponding to the first period of a second mode, a scan signal having a turn-off voltage level may be provided to the first scan line.

[0023] The pen detection panel may further include a second loop antenna extending along an edge of the pen detection panel.

[0024] In the first mode, the second loop antenna may be connected to a power supply unit. In the second mode, the second loop antenna may be connected to the first loop antenna.

[0025] Another exemplary embodiment of the invention provides a display device including: a display panel including pixels; a pen detection unit disposed on one surface of the display panel; and a power supply unit configured to supply driving power to the display panel, wherein the pen detection unit includes: a pen detection panel including a plurality of pen sensor units each including a first loop antenna and at least one transistor connected to the first loop antenna; and a pen driving circuit configured to detect a position of a pen based on a first electromagnetic field generated through the first loop antenna in a first mode and transmit a sensing signal to the power supply unit in a second mode different from the first mode.

[0026] The first loop antenna may have a spiral shape in a plane, and the spiral shape may have a width of 1 mm to 10 mm.

[0027] The pen detection panel may further include a readout line connected to the first loop antenna. The pen driving circuit may include: a pen detection block configured to detect a position of a pen based on the first electromagnetic field; and a switch block configured to connect the readout line to the pen detection block in the first mode and connect the readout line to the power supply unit in the second mode.

[0028] The pen detection panel may further include a second loop antenna extending along an edge of the pen detection panel.

[0029] The display device may further include a touch detection panel disposed on another surface of the display panel. The touch detection panel may include touch electrodes disposed in a touch sensing area and a third loop antenna disposed in a non-touch sensing area surrounding the touch sensing area. The third loop antenna may be connected to the power supply unit.

[0030] It will be understood that the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the claimed invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The drawings illustrate exemplary embodiments of the invention and, together with the description, are used to explain the inventive concept. The drawings are included to provide a further understanding of the invention and are incorporated into and constitute a part of this specification.

[0032] Figure 1 is a block diagram showing a display device according to an embodiment of the present disclosure.

[0033] Figure 2 is a cross-sectional view showing an example of the display device shown in Figure 1 the display device shown in

[0034] Figure 3 is a diagram showing an example of a display unit included in the display device shown in Figure 2 the display device shown in

[0035] Figure 4 is a diagram showing an example of a touch detection unit included in the display device shown in Figure 2 the display device shown in

[0036] Figure 5 is a diagram showing an example of a pen detection unit included in the display device shown in Figure 2 the display device shown in

[0037] Figure 6 is a diagram showing a pen sensor unit included in the pen detection unit shown in Figure 5 the pen detection unit shown in

[0038] Figure 7A is a circuit diagram showing an example of the pen sensor unit shown in Figure 6 the pen sensor unit shown in

[0039] Figure 7B 、 Figure 7C and Figure 7D are circuit diagrams showing other examples of the pen sensor unit shown in Figure 6 the pen sensor unit shown in

[0040] Figure 8 is a diagram showing an example of a pen driving circuit included in the pen detection unit shown in Figure 2 the pen detection unit shown in

[0041] Figure 9 and Figure 10 are diagrams showing a first operation of the pen driving circuit shown in Figure 8 the pen driving circuit shown in

[0042] Figure 11 andFigure 12 is a diagram showing Figure 8 the second operation of the pen drive circuit shown in

[0043] Figure 13 is a diagram showing Figure 2 another example of a pen detection unit included in the display device shown in

[0044] Figure 14 is a diagram showing Figure 2 an example of a touch detection unit included in the display device shown in DETAILED DESCRIPTION

[0045] In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the various exemplary embodiments or implementations of the invention. As used herein, "embodiment" and "implementation" are interchangeable words used as non-limiting examples of a device or method that employs one or more of the inventive concepts disclosed herein. However, it is apparent that the various exemplary embodiments can be practiced without these specific details or with one or more equivalent arrangements. In other cases, well-known structures and devices are shown in block diagram form to avoid unnecessarily obscuring the various exemplary embodiments. In addition, the various exemplary embodiments can be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shapes, configurations, and characteristics of the exemplary embodiments can be used or implemented in another exemplary embodiment.

[0046] Unless otherwise stated, the exemplary embodiments shown are understood to provide exemplary features of different details that can be implemented in some ways in practice for the inventive concept. Thus, unless otherwise stated, without departing from the inventive concept, the features, components, modules, layers, films, panels, regions, and / or aspects, etc. (hereinafter, individually or collectively referred to as "elements") of the various embodiments can be combined, separated, interchanged, and / or rearranged in other ways.

[0047] Cross-hatching and / or shading are generally provided in the use of the drawings to clarify the boundaries between adjacent elements. Thus, unless otherwise detailed, the presence or absence of cross-hatching or shading does not convey or indicate any preference or requirement for the specific materials, material properties, dimensions, ratios, commonality between the elements shown, and / or any other characteristics, attributes, properties, etc. In addition, in the drawings, for clarity and / or descriptive purposes, the dimensions and relative dimensions of the elements may be exaggerated. When the exemplary embodiments can be implemented differently, the specific process order can be performed in a different order than described. For example, two consecutively described processes can be performed substantially simultaneously or in an order opposite to the described order. Also, the same reference numerals denote the same elements.

[0048] When an element or layer is referred to as being “on,” “connected to,” or “coupled to” another element or layer, the element or layer can be directly on, directly connected to, or directly coupled to the other element or layer, or intervening elements or layers may be present. However, when an element or layer is referred to as being “directly on,” “directly connected to,” or “directly coupled to” another element or layer, no intervening elements or layers are present. For this reason, the term “connected” can refer to physical connection, electrical connection, and / or fluid connection with or without intervening elements. Further, the DR1 axis, DR2 axis, and DR3 axis are not limited to the three axes such as the x-axis, y-axis, and z-axis of a rectangular coordinate system, but can be interpreted in a broader sense. For example, the DR1 axis, DR2 axis, and DR3 axis can be perpendicular to each other, or can represent different directions that are not perpendicular to each other. For the purposes of this disclosure, “at least one of X, Y, and Z” and “at least one selected from the group consisting of X, Y, and Z” can be interpreted as only X, only Y, only Z, or any combination of two or more of X, Y, and Z, such as, by way of example, XYZ, XYY, YZ, and ZZ. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items.

[0049] Although terms such as “first,” “second,” etc. may be used herein to describe various types of elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first element discussed below could be termed a second element without departing from the teachings of the disclosure.

[0050] Spatial relative terms such as “beneath,” “below,” “under,” “lower,” “above,” “upper,” “on top of,” “higher,” “side” (e.g., as in “sidewall”), etc. may be used herein for descriptive purposes to describe the relationship of one element to another (other) element as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use, operation, and / or manufacture in addition to the orientation depicted in the figures. For example, if the device in the figures is flipped, an element described as “beneath” or “under” other elements or features will then be oriented “above” the other elements or features. Thus, the exemplary term “beneath” can encompass both an above and a below orientation. Further, the device may be otherwise oriented (e.g., rotated 90 degrees or at other orientations), and as such, the spatial relative descriptors used herein are to be interpreted accordingly.

[0051] The terms used herein are for the purpose of describing particular embodiments and are not intended to be limiting. As used herein, unless the context clearly dictates otherwise, the singular forms "a," "an," and "the" are also intended to include the plural forms. Additionally, when the terms "comprises," "comprising," and / or their variants are used in this specification, they specify the presence of the stated features, integers, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It is also noted that, as used herein, the terms "substantially," "about," and other similar terms are used as approximate terms and not as terms of degree, and as such, are used to account for the inherent deviations in measured, calculated, and / or provided values that would be recognized by a person of ordinary skill in the art.

[0052] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. Terms (such as those defined in a general dictionary) should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0053] The present disclosure can be applied with various changes and different shapes, and thus is described in detail only by way of specific examples. However, the examples are not limited to certain shapes, but are applicable to all changes and equivalent materials and substitutions.

[0054] Figure 1 is a block diagram showing a display device 10 according to an embodiment of the present disclosure.

[0055] Referring to Figure 1 , the display device 10 may include a display area DA and a non-display area NDA.

[0056] The display area DA is defined as an area for displaying an image, and a plurality of pixels may be provided in the display area DA.

[0057] In an embodiment, the display area DA may be an input sensing area IDA for recognizing a touch input, a fingerprint pattern, a pen input, etc. of a user. For example, the input sensing area IDA may include a plurality of pixels and a plurality of sensors. That is, the input sensing area IDA may display an image and be used as an area configured to recognize a touch input, a fingerprint pattern, and a pen input of a user.

[0058] Although in Figure 1The case where the input sensing area IDA has the same area as the display area DA is shown, but the inventive concept is not limited thereto. For example, the input sensing area IDA may be located in a partial area of the display area DA. In some embodiments, the areas configured to recognize a user's touch input, fingerprint pattern, pen input, etc. may be set to be different from each other.

[0059] In an embodiment, the display area DA may have a flat shape. However, the inventive concept is not limited thereto, and at least a partial area of the display area DA may be curved. Also, the display area DA may be provided in the edge area of the display device 10.

[0060] Although not shown in the figures, the display device 10 may include a receiving groove capable of receiving the pen 20. The pen 20 is a component for pen input and may be formed as a component separate from the display device 10. However, the inventive concept is not limited thereto, and the pen 20 may be a component included in the display device 10.

[0061] In an embodiment, the pen 20 may include a resonant circuit 23. For ease of description, Figure 1 The case where the resonant circuit 23 includes one capacitor C and one inductor L is shown. However, the inventive concept is not limited thereto, and various modifications may be made to the configuration of the resonant circuit 23 provided in the pen 20. In some cases, the pen 20 may include multiple resonant circuits 23.

[0062] Figure 2 shows Figure 1 A cross-sectional view taken along line I-I' of an example of the display device 10 shown in

[0063] Referring to Figure 2 , the display device 10 may include a display unit DU (or display panel), a touch detection unit TDU (first input detection unit, touch sensing layer or touch sensing panel) provided on top of the display unit DU, a fingerprint detection unit FDU (second input detection unit, fingerprint sensing layer or fingerprint sensing panel) provided on the bottom of the display unit DU, and a pen detection unit PDU (third input detection unit, pen sensing layer or pen detection panel) provided on the bottom of the fingerprint detection unit FDU.

[0064] The display unit DU may include a substrate SUB, a thin film transistor layer TFTL (or pixel circuit layer), a light emitting device layer EML, and a thin film encapsulation layer TFEL, and the thin film transistor layer TFTL (or pixel circuit layer), the light emitting device layer EML, and the thin film encapsulation layer TFEL are all provided on the substrate SUB.

[0065] The substrate SUB can be made of an insulating material such as glass, quartz, or a polymer resin. Examples of polymer materials include polyethersulfone (PES), polyacrylate (PA), polyarylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polyphenylene sulfide (PPS), polyallyl ester, polyimide (PI), polycarbonate (PC), cellulose triacetate (CAT), cellulose acetate propionate (CAP), and combinations thereof. Optionally, the substrate SUB can include a metallic material.

[0066] The substrate SUB can be a rigid substrate or a flexible substrate such as bendable, foldable, rollable, etc. When the substrate SUB is a flexible substrate, the substrate SUB can be formed of polyimide (PI), but the inventive concept is not limited thereto.

[0067] The thin-film transistor layer TFTL can be disposed on the substrate SUB. In addition to the thin-film transistors of each of the pixels, display scan lines, display data lines, power lines, display scan control lines, routing lines connecting display pads (or "pads") and display data lines, etc. can also be formed in the thin-film transistor layer TFTL. Each of the thin-film transistors can include a gate electrode, a semiconductor layer, a source electrode, and a drain electrode. When, as Figure 3 shown, the display scan driver DSCV is formed in the non-display area NDA of the display unit DU, the display scan driver DSCV can include thin-film transistors (TFTs).

[0068] The thin-film transistor layer TFTL can be disposed in the display area DA and the non-display area NDA. Specifically, the thin-film transistors of each of the pixels, display scan lines, display data lines, and power lines in the thin-film transistor layer TFTL can be disposed in the display area DA. The display scan control lines and routing lines in the thin-film transistor layer TFTL can be disposed in the non-display area NDA.

[0069] The light-emitting device layer EML can be disposed on the thin-film transistor layer TFTL. The light-emitting device layer EML can include pixels each including a first electrode, a light-emitting layer, and a second electrode, and a pixel defining layer defining the pixels. The light-emitting device layer EML can be an organic light-emitting layer including an organic material. The light-emitting device layer EML can include a hole transport layer, an organic light-emitting layer, and an electron transport layer. When a predetermined voltage is applied to the first electrode through the thin-film transistors of the thin-film transistor layer TFTL and a cathode voltage is applied to the second electrode, holes and electrons move to the organic light-emitting layer through the hole transport layer and the electron transport layer, respectively, and combine with each other in the organic light-emitting layer, thereby emitting light. The pixels of the light-emitting device layer EML can be arranged in the display area DA (see Figure 1 ).

[0070] The thin film encapsulation layer TFEL may be disposed on the light emitting device layer EML. The thin film encapsulation layer TFEL may prevent oxygen or moisture from penetrating into the light emitting device layer EML. To this end, the thin film encapsulation layer TFEL may include at least one inorganic layer. The inorganic layer may be a silicon nitride layer, a silicon oxynitride layer, a silicon oxide layer, a titanium oxide layer, or an aluminum oxide layer, but the inventive concept is not limited thereto.

[0071] Moreover, the thin film encapsulation layer TFEL may protect the light emitting device layer EML from foreign substances such as dust. To this end, the thin film encapsulation layer TFEL may include at least one organic layer. The organic layer may be an acrylic resin, an epoxy resin, a phenolic resin, a polyamide resin, or a polyimide resin, but the inventive concept is not limited thereto.

[0072] The thin film encapsulation layer TFEL may be disposed in Figure 1 both the display area DA and the non-display area NDA described with reference to. Specifically, the thin film encapsulation layer TFEL may cover the light emitting device layer EML of the display area DA and the non-display area NDA, and cover the thin film transistor layer TFTL of the non-display area NDA.

[0073] The touch detection unit TDU may be disposed on the thin film encapsulation layer TFEL of the display unit DU. When the touch detection unit TDU is directly disposed on the thin film encapsulation layer TFEL, the thickness of the display device 10 may be reduced as compared with when a separate touch panel including the touch detection unit TDU is attached to the thin film encapsulation layer TFEL.

[0074] The touch detection unit TDU may include a touch electrode configured to sense a user's touch by using a capacitance method and a touch line connecting the pad and the touch electrode. For example, the touch detection unit TDU may sense or detect a user's touch by using a self-capacitance method or a mutual-capacitance method.

[0075] The detailed configuration of the touch detection unit TDU will be described later with reference to Figure 4 description.

[0076] A cover window (not shown) may be additionally disposed on the touch detection unit TDU. The touch detection unit TDU and the cover window may be attached to each other by a transparent adhesive member such as an optically clear adhesive (OCA).

[0077] The fingerprint detection unit FDU may be disposed on the bottom of the substrate SUB of the display unit DU. The fingerprint detection unit FDU may use an organic light emitting device provided in a pixel of the display unit DU as a light source for fingerprint recognition. The fingerprint detection unit FDU may include a fingerprint recognition sensor. The fingerprint recognition sensor may be a photoelectric sensor. For example, the fingerprint recognition sensor may include a photodiode, a CMOS image sensor, a CCD camera, etc., but the inventive concept is not limited thereto.

[0078] When the user's finger touches the cover window, the light output from the light-emitting device layer EML is reflected by the ridges or valleys of the user's finger, and the reflected light is received by the fingerprint detection unit FDU, so that the fingerprint detection unit FDU can identify the pattern of the user's fingerprint.

[0079] The pen detection unit PDU can be disposed on the bottom of the fingerprint detection unit FDU. The pen detection unit PDU may include a pen sensor portion PSP (or pen sensor pixels, see Figure 5 ). The pen sensor portion PSP may be configured with an electromagnetic resonance (EMR) sensor. When a drive signal is applied to the pen sensor portion PSP, an electromagnetic field can be generated in the pen sensor PS of the pen sensor portion PSP (see Figure 6 ). The pen 20 having the resonance circuit 23 therein (see Figure 1 ) can resonate through the electromagnetic field to maintain the resonance frequency for a certain period of time and then output the resonance frequency to the pen sensor portion PSP again. Therefore, the pen sensor portion PSP (or pen sensing controller) can detect the contact position of the pen 20 by sensing the electromagnetic field output from the pen 20. The resonance circuit 23 as an LC combination circuit is a circuit in which the maximum current flows at a specific frequency of the applied power, and can extract only the output characteristics in a specific frequency band.

[0080] In Figure 2 The arrangement order of the display unit DU, the touch detection unit TDU, the fingerprint detection unit FDU, and the pen detection unit PDU shown is only illustrative, and the inventive concept is not limited thereto. In addition, some components among the display unit DU, the touch detection unit TDU, the fingerprint detection unit FDU, and the pen detection unit PDU may be omitted. Although the display unit DU, the touch detection unit TDU, the fingerprint detection unit FDU, and the pen detection unit PDU are shown as separate components from each other, this is only illustrative, and some components among the display unit DU, the touch detection unit TDU, the fingerprint detection unit FDU, and the pen detection unit PDU may be integrally provided.

[0081] Figure 3 is a diagram showing an example of the display unit DU included in the display device 10 shown in Figure 2 . For ease of description, only the pixel P, the display scan line DSL, the display data line DDL, the data link line DLL, the power line PWL, the display scan control line DSCL, the display scan driver DSCV, the display drive circuit DDC, and the display pad DP in the display unit DU are shown in Figure 3 .

[0082] Refer to Figure 3, a display scan line DSL, a display data line DDL, a power line PWL, and a pixel P are disposed in a display area DA. The display scan lines DSL may be formed side by side in a first direction DR1, and the display data lines DDL may be formed in parallel in a second direction DR2 intersecting the first direction DR1. The power line PWL may include at least one line formed in parallel with the display data line DDL in the second direction DR2 and a plurality of lines branched from the at least one line in the first direction DR1.

[0083] Each of the pixels P may be connected to at least one of the display scan lines DSL, at least one of the display data lines DDL, and the power line PWL. The pixel P may include a thin film transistor including a driving transistor and at least one switching transistor, an organic light emitting diode, and a capacitor. When a scan signal is applied from the display scan line DSL, a data voltage of the display data line DDL is applied to the pixel P, and the pixel P supplies a driving current to the organic light emitting diode according to the data voltage applied to its gate electrode, thereby emitting light.

[0084] The display scan driver DSCV may be connected to the display driving circuit DDC through at least one display scan control line DSCL. The display scan driver DSCV may receive a scan control signal of the display driving circuit DDC. The display scan driver DSCV may generate a scan signal according to the display scan control signal and supply the scan signal to the display scan line DSL.

[0085] Although the case where the display scan driver DSCV is formed in the non-display area NDA at the left outer side of the display area DA is illustrated in Figure 3 , the inventive concept is not limited thereto. For example, the display scan driver DSCV may be formed in the non-display area NDA at the left and right outer sides of the display area DA.

[0086] The display driving circuit DDC may be connected to a display pad DP to receive digital video data and a timing signal. The display driving circuit DDC may convert the digital video data into an analog data voltage and supply the analog data voltage to the display data line DDL through a data link line DLL. Moreover, the display driving circuit DDC may generate a scan control signal and supply the scan control signal to the display scan driver DSCV through the display scan control line DSCL. The pixel P to which the data voltage is to be supplied may be selected by the scan signal of the display scan driver DSCV, and the data voltage may be supplied to the selected pixel P. The display driving circuit DDC may be formed as an integrated circuit (IC) to be attached to a substrate SUB by using a chip on glass (COG) method, a chip on plastic (COP) method, or an ultrasonic bonding method.

[0087] Figure 4 shows an example included in Figure 2A diagram showing an example of a touch detection unit TDU in the display device 10 shown in the figure. For ease of description, in Figure 4 only the touch electrodes TE and RE, the touch lines TL1, TL2 and RL, and the touch pad TP are shown.

[0088] Referring to Figure 4 , the touch detection unit TDU may include a touch sensing area TDA configured to sense a user's touch and a non-touch sensing area NTDA provided at the periphery of the touch sensing area TDA. The touch sensing area TDA may overlap with the display area DA of the display unit DU, and the non-touch sensing area NTDA may overlap with the non-display area NDA of the display unit DU.

[0089] The touch electrodes TE and RE may be arranged in the touch sensing area TDA. The touch electrodes TE and RE may include a sensing electrode RE electrically connected to each other in a first direction DR1 and a driving electrode TE electrically connected to each other in a second direction DR2 intersecting the first direction DR1. Although in Figure 4 the case where the sensing electrode RE and the driving electrode TE are formed in a rhombus planar shape is illustrated, the inventive concept is not limited thereto.

[0090] The driving electrodes TE adjacent to each other in the second direction DR2 may be electrically connected to each other through a connection electrode BE to prevent the sensing electrode RE and the driving electrode TE from short-circuiting each other in their crossing area. The driving electrode TE and the sensing electrode RE may be provided in one layer, and the connection electrode BE may be provided in a layer different from the layer of the driving electrode TE and the sensing electrode RE. In addition, the sensing electrode RE electrically connected to each other in the first direction DR1 and the driving electrode TE electrically connected to each other in the second direction DR2 may be electrically insulated from each other.

[0091] The touch lines TL1, TL2 and RL may be arranged in the non-touch sensing area NTDA. The touch lines TL1, TL2 and RL may include a sensing line RL connected to the sensing electrode RE, a first driving line TL1 and a second driving line TL2 connected to the driving electrode TE.

[0092] The sensing electrode RE provided on the right side of the touch sensing area TDA may be connected to the sensing line RL. For example, the sensing electrode RE provided at the right end among the sensing electrodes RE electrically connected to each other in the first direction DR1 may be connected to the sensing line RL. The sensing line RL may be connected to the first touch pad TP1. The touch driving circuit TDC mounted on the flexible printed circuit board FPC may be electrically connected to the sensing electrode RE through the first touch pad TP1.

[0093] In an embodiment, a driving electrode TE disposed at a lower side of a touch sensing area TDA may be connected to a first driving line TL1, and a driving electrode TE disposed at an upper side of the touch sensing area TDA may be connected to a second driving line TL2. For example, among the driving electrodes TE electrically connected to each other in a second direction DR2, the driving electrode TE disposed at a lower end may be connected to the first driving line TL1, and the driving electrode TE disposed at an upper end among the driving electrodes TE electrically connected to each other in the second direction DR2 may be connected to the second driving line TL2. The second driving line TL2 may be connected to the driving electrode TE disposed at the upper side of the touch sensing area TDA via a left outer side of the touch sensing area TDA. The first driving line TL1 and the second driving line TL2 may be connected to a second touch pad TP2. A touch driving circuit TDC may be electrically connected to the driving electrode TE through the second touch pad TP2.

[0094] In an embodiment, a mutual capacitance method or a self-capacitance method may be used to drive touch electrodes TE and RE.

[0095] For example, when driving the touch electrodes TE and RE using the mutual capacitance method, the touch driving circuit TDC may supply a driving signal to the driving electrode TE through the first driving line TL1 and the second driving line TL2, and charge a mutual capacitance formed in a cross region between the sensing electrode RE and the driving electrode TE. Subsequently, the touch driving circuit TDC may measure a change in charge of the sensing electrode RE through a sensing line RL, and determine whether a touch has been input based on the change in charge of the sensing electrode RE. The driving signal may be a signal having a plurality of driving pulses.

[0096] In another example, when driving the touch electrodes TE and RE using the self-capacitance method, the touch driving circuit TDC may supply a driving signal to both the driving electrode TE and the sensing electrode RE through the first driving line TL1, the second driving line TL2, and the sensing line RL, and charge the self-capacitances of the driving electrode TE and the sensing electrode RE. Subsequently, the touch driving circuit TDC may measure a change in charge of the self-capacitances of the driving electrode TE and the sensing electrode RE through the first driving line TL1, the second driving line TL2, and the sensing line RL, and determine whether a touch has been input based on the change in charge of the self-capacitance.

[0097] Each of the driving electrode TE, the sensing electrode RE, and the connection electrode BE may be formed as a mesh-shaped electrode. When a touch detection unit TDU including the driving electrode TE and the sensing electrode RE is directly formed with reference to Figure 2When on the described thin film encapsulation layer TFEL, since the distance between the second electrode of the light-emitting device layer EML and the driving electrode TE or the sensing electrode RE of the touch sensing layer is short, a very large parasitic capacitance will be formed between the second electrode of the light-emitting device layer EML and the driving electrode TE or the sensing electrode RE of the touch sensing layer. To reduce the parasitic capacitance, each of the driving electrode TE and the sensing electrode RE can be formed as a mesh electrode instead of a non-patterned electrode such as a transparent oxide conductive layer like ITO or IZO.

[0098] The first protection line GL1 can be disposed outside the outermost sensing line RL among the sensing lines RL. Additionally, the first ground line GRL1 can be disposed outside the first protection line GL1. That is, the first protection line GL1 can be disposed on the right side of the sensing line RL at the right end among the sensing lines RL, and the first ground line GRL1 can be disposed on the right side of the first protection line GL1.

[0099] The second protection line GL2 can be disposed between the innermost sensing line RL among the sensing lines RL and the first driving line TL1 at the right end among the first driving lines TL1. Moreover, the second protection line GL2 can be disposed between the first driving line TL1 at the right end among the first driving lines TL1 and the second ground line GRL2. In addition, the third protection line GL3 can be disposed between the innermost sensing line RL among the sensing lines RL and the second ground line GRL2. The second ground line GRL2 can be connected to the first touch pad TP1 at the leftmost position among the first touch pads TP1 and the second touch pad TP2 at the rightmost position among the second touch pads TP2.

[0100] The fourth protection line GL4 can be disposed outside the outermost second driving line TL2 among the second driving lines TL2. Additionally, the third ground line GRL3 can be disposed outside the fourth protection line GL4. That is, the fourth protection line GL4 can be disposed on the left side and the upper side of the second driving line TL2 at the left end and the upper end among the second driving lines TL2, and the third ground line GRL3 can be disposed on the left side and the upper side of the fourth protection line GL4.

[0101] The fifth protection line GL5 can be disposed inside the innermost second driving line TL2 among the second driving lines TL2. That is, the fifth protection line GL5 can be disposed between the second driving line TL2 at the right end among the second driving lines TL2 and the touch electrodes TE and RE.

[0102] According to Figure 4In the embodiment shown, the first ground line GRL1, the second ground line GRL2, and the third ground line GRL3 may be disposed at the outermost sides on the right side, the lower side, and the upper side of the display unit DU. Additionally, a ground voltage may be applied to the first ground line GRL1, the second ground line GRL2, and the third ground line GRL3. Accordingly, when static electricity is externally applied, the static electricity may be discharged to the first ground line GRL1, the second ground line GRL2, and the third ground line GRL3.

[0103] Moreover, according to Figure 4 In the embodiment shown, since the first protection line GL1 is disposed between the sensing line RL disposed at the outermost side and the first ground line GRL1, the first protection line GL1 may function to minimize the influence of the voltage change of the first ground line GRL1 on the sensing line RL disposed at the outermost side. The second protection line GL2 may be disposed between the sensing line RL disposed at the innermost side and the first driving line TL1 disposed at the outermost side. Accordingly, the second protection line GL2 may function to minimize the influence of the voltage change on the sensing line RL disposed at the innermost side and the first driving line TL1 disposed at the outermost side. Since the third protection line GL3 is disposed between the sensing line RL disposed at the innermost side and the second ground line GRL2, the third protection line GL3 may function to minimize the influence of the voltage change of the second ground line GRL2 on the sensing line RL disposed at the innermost side. Since the fourth protection line GL4 is disposed between the second driving line TL2 disposed at the outermost side and the third ground line GRL3, the fourth protection line GL4 may function to minimize the influence of the voltage change of the third ground line GRL3 on the second driving line TL2 disposed at the outermost side. Since the fifth protection line GL5 is disposed between the second driving line TL2 disposed at the innermost side and the touch electrodes TE and RE, the fifth protection line GL5 may function to minimize the mutual influence between the second driving line TL2 disposed at the innermost side and the touch electrodes TE and RE.

[0104] When driving the touch electrodes TE and RE using the mutual capacitance method, a ground voltage may be applied to the first protection line GL1, the second protection line GL2, the third protection line GL3, the fourth protection line GL4, and the fifth protection line GL5. When driving the touch electrodes TE and RE using the self-capacitance method, a driving signal identical to the driving signals applied to the first driving line TL1, the second driving line TL2, and the sensing line RL may be applied to the first protection line GL1, the second protection line GL2, the third protection line GL3, the fourth protection line GL4, and the fifth protection line GL5. However, Figure 4The structure and arrangement of the lines TL1, TL2, RL, GL1, GL2, GL3, GL4, GL5, GRL1, GRL2, and GRL3 of the touch detection unit TDU shown are merely illustrative, and the inventive concept is not limited thereto.

[0105] Figure 5 is a diagram showing an example of a pen detection unit PDU included in Figure 2 the display device 10 shown in Figure 6 is a diagram showing an example of a pen detection unit PDU included in Figure 5 the pen sensor part PSP in the pen detection unit PDU shown in

[0106] First, referring to Figure 5 , the pen detection unit PDU (or pen detection panel) may include a pen scan driver PSCV and a pen pad PD located in the non-pen sensing area NPDA and a pen sensor part PSP located in the pen sensing area PDA. The pen sensing area PDA is an area configured to sense a pen input, and the non-pen sensing area NPDA is defined as an area provided around the pen sensing area PDA.

[0107] The pen sensing area PDA may overlap with the display area DA of the display unit DU, and the non-pen sensing area NPDA may overlap with the non-display area NDA of the display unit DU.

[0108] The pen sensor part PSP may be arranged in a matrix form along rows and columns. For example, the pen sensor part PSP may be arranged in a matrix form along rows and columns on a separate substrate. Each of the lengths of the pen sensor part PSP in the first direction DR1 and the second direction DR2 may be 1 mm to 10 mm, respectively. However, the inventive concept is not limited thereto, and each of the lengths of the pen sensor part PSP in the first direction DR1 and the second direction DR2 may be variously changed according to the size of the pen detection unit PDU, the arrangement position of the pen detection unit PDU, etc.

[0109] The first pen scan line PSL1, the second pen scan line PSL2, the first pen line PL1 (or drive line), and the second pen line PL2 (or readout line) may be provided in the pen sensing area PDA together with the pen sensor part PSP. The first pen scan line PSL1 and the second pen scan line PSL2 may be formed in parallel in the first direction DR1, and the first pen line PL1 and the second pen line PL2 may be formed in parallel in the second direction DR2. Each of the pen sensor part PSP may be connected to any one of the first pen scan line PSL1, any one of the second pen scan line PSL2, any one of the first pen line PL1, and any one of the second pen line PL2.

[0110] Referring to Figure 6, each of the pen sensor units PSP may include a pen sensor circuit PSC and a pen sensor PS (or a loop antenna, or a coil) connected to the pen sensor circuit PSC. The pen sensor circuit PSC may include at least one thin film transistor. The pen sensor PS may have a spiral shape on a plane. The spiral shape may have a width of 1 mm to 10 mm. For example, the pen sensor PS may have a shape wound at least once from its central portion. Although the case where the pen sensor PS has a square spiral shape is shown in Figure 6 , the inventive concept is not limited thereto. One end of the pen sensor PS may be connected to the pen sensor circuit PSC, and the other end of the pen sensor PS may be connected to a reference power supply. The reference power supply may be a ground (GND) power supply.

[0111] The pen sensor PS may be made of a metal material such as copper (Cu), aluminum (Al), molybdenum (Mo), or silver (Ag). Since the pen sensor PS is located on the bottom of the pixel P, the pen sensor PS is independent of the transmittance of the display device 10, and thus the line width, thickness, position, etc. of the pen sensor PS are hardly limited. Since the pen sensor PS is provided individually for each region, a degree of freedom including low resistance is provided.

[0112] Returning to the reference Figure 5 , the pen scan driver PSCV may be connected to the pen pad PD through at least one pen scan control line PSCL. The pen detection unit PDU may further include a pen drive circuit PDC in addition to the pen detection panel described above. The pen drive circuit PDC mounted on the flexible printed circuit board FPC may be connected to the pen scan driver PSCV through the pen pad PD. The pen scan driver PSCV may receive a pen scan control signal from the pen drive circuit PDC. The pen scan driver PSCV may generate a scan signal (or a pen scan signal, or a first scan signal) according to the pen scan control signal, and supply the scan signal to the first pen scan line PSL1. The first pen scan line PSL1 may transmit the scan signal to the pen sensor unit PSP. Each of the pen sensor units PSP may be applied with a drive signal of the first pen line PL1.

[0113] The pen scan driver PSCV may generate a sense scan signal (or a pen sense scan signal, or a second scan signal) according to the pen scan control signal, and supply the sense scan signal to the second pen scan line PSL2. The second pen scan line PSL2 may transmit the sense scan signal to the pen sensor unit PSP. Each of the pen sensor units PSP may transmit a sense signal through the second pen line PL2, and the pen drive circuit PDC may detect the pen input and the coordinates of the pen input.

[0114] In some embodiments, the pen driving circuit PDC may connect the pen sensor unit PSP to the power supply unit PSU. The power supply unit PSU may be included in the display device 10 (see Figure 1 ) and store or generate the power necessary for driving the display device 10. When the power supply unit PSU uses wireless charging technology (or electromagnetic induction technology), the pen sensor unit PSP (or the pen sensor PS) may be used as an antenna for receiving wireless power of the power supply unit PSU.

[0115] Meanwhile, although the case where the pen driving circuit PDC connects the pen sensor unit PSP to the power supply unit PSU is described in Figure 5 , the pen driving circuit PDC is not limited thereto.

[0116] For example, when the display device 10 includes a near-field communication module NFCU (i.e., a module using NFC technology), a magnetic secure transmission module MSTU (i.e., a module using MST technology), etc., the pen driving circuit PDC may selectively connect the pen sensor unit PSP to at least one of the near-field communication module NFCU, the magnetic secure transmission module MSTU, etc. The pen sensor unit PSP (or the pen sensor PS) may be used as an antenna for at least one of the near-field communication module NFCU, the magnetic secure transmission module MSTU, etc.

[0117] Figure 7A is a circuit diagram showing an example of the pen sensor unit PSP shown in Figure 6 .

[0118] Referring to Figure 6 and Figure 7A , the pen sensor unit PSP may include a pen sensor circuit PSC and a pen sensor PS. The pen sensor circuit PSC may include a first transistor TFT1 (or a first thin film transistor), a second transistor TFT2, and a third transistor TFT3.

[0119] The first transistor TFT1 may include a first electrode connected to the first pen line PL1, a second electrode connected to the gate electrode of the second transistor TFT2, and a gate electrode connected to the first pen scan line PSL1. The first transistor TFT1 may be turned on in response to the scan signal of the first pen scan line PSL1 and connect the first pen line PL1 to the gate electrode of the second transistor TFT2.

[0120] The second transistor TFT2 may include a first electrode connected to the first driving voltage line VDD1, a second electrode connected to one end (PSC end) of the pen sensor PS, and a gate electrode connected to the second electrode of the first transistor TFT1. The second transistor TFT2 may supply current to the pen sensor PS in response to the driving signal of the first pen line PL1.

[0121] The third transistor TFT3 may include a first electrode connected to the second electrode of the second transistor TFT2 (or the PSC terminal connected to the pen sensor PS), a second electrode connected to the second pen line PL2, and a gate electrode connected to the second pen scan line PSL2. The third transistor TFT3 may be turned on in response to the sensing scan signal of the second pen scan line PSL2, and connect the PSC terminal of the pen sensor PS to the second pen line PL2.

[0122] In some embodiments, the pen sensor unit PSP may operate in a first mode or a second mode. The first mode is the pen sensing mode. In the first mode, the pen sensor unit PSP may generate a first electromagnetic field through the pen sensor PS, and detect a second electromagnetic field caused by the pen 20 through the pen sensor PS. The pen drive circuit PDC (see Figure 5 ) may detect the contact of the pen 20 and the coordinates of the contact based on the current caused by the second electromagnetic field.

[0123] The second mode is the charging mode (or receiving mode, or information sending / receiving mode). In the second mode, the pen sensor unit PSP does not generate the first electromagnetic field, but may detect a third electromagnetic field caused by an external electromagnetic induction device through the pen sensor PS, and provide the current (or information) caused by the third electromagnetic field to the power supply unit PSU (see Figure 5 ).

[0124] The detailed operation of the pen sensor unit PSP will be described later with reference to Figures 9 to 12 .

[0125] Meanwhile, in Figure 7A , the case where the first transistor to the third transistor TFT1, TFT2, and TFT3 are implemented with P-type metal oxide semiconductor field effect transistors (MOSFETs) is shown, but the inventive concept is not limited thereto. For example, the first transistor to the third transistor TFT1, TFT2, and TFT3 may be implemented with N-type MOSFETs.

[0126] Moreover, although in Figure 7A , the case where the pen sensor circuit PSC (or the pen sensor unit PSP) includes three transistors TFT1, TFT2, and TFT3 connected to the first pen scan line PSL1, the second pen scan line PSL2, the first pen line PL1, and the second pen line PL2 is shown, the pen sensor circuit PSC is not limited thereto.

[0127] Figures 7B to 7D is a circuit diagram showing other examples of the pen sensor unit PSP shown in Figure 6 .

[0128] First, refer to Figure 7A and Figure 7B, except for the third transistor TFT3, Figure 7B the pen sensor unit PSP shown in Figure 7A may be the same as or similar to the pen sensor unit PSP shown in

[0129] The first transistor TFT1 may be turned on in response to a scan signal of the pen scan line PSL, and the second transistor TFT2 may supply current from the first driving voltage line VDD1 to the pen sensor PS.

[0130] The third transistor TFT3 may include a first electrode connected to the second driving voltage line VDD2, a second electrode connected to a reference power supply (and the second pen line PL2), and a gate electrode connected to the one end of the pen sensor PS. The third transistor TFT3 may transfer current from the second driving voltage line VDD2 to the second pen line PL2 in response to the voltage at the one end of the pen sensor PS. The third transistor TFT3 amplifies the sensing signal detected by the pen sensor PS, thereby improving the sensitivity of the pen detection unit PDU (see Figure 5 ).

[0131] Referring to Figure 7B and Figure 7C , Figure 7C the pen sensor unit PSP shown in Figure 7B is different from the pen sensor unit PSP shown in Figure 7C in that the pen sensor unit PSP shown in

[0132] also includes a capacitor C.

[0133] Referring to Figure 7A and Figure 7D , Figure 7D the pen sensor unit PSP shown in Figure 7A is different from the pen sensor unit PSP shown in Figure 7D in that the pen sensor unit PSP shown in

[0134] does not include the third transistor TFT3.

[0135] Figure 8 is a diagram showing an example of a pen driving circuit PDC included in the pen detection unit PDU shown in Figure 2 .

[0136] Referring to Figure 2 , Figure 7A and Figure 8, the pen driving circuit PDC may include a switch unit SWU (or a switch block) and a pen detection block PDB.

[0137] The switch unit SWU may selectively connect the pen detection block PDB or the power supply unit PSU to the pen pad PD based on selection signals SEL1 and SEL2. The selection signals SEL1 and SEL2 may be provided from an external device (e.g., an application processor). The pen pad PD may be connected to the pen sensor unit PSP through a second pen line PL2.

[0138] In an embodiment, the switch unit SWU may include a first switch SW1 (or a first switching element) and a second switch SW2. The first switch SW1 may be connected between the pen pad PD and the pen detection block PDB and turn on in response to a first selection signal SEL1 to connect the pen pad PD and the pen detection block PDB. The second switch SW2 may be connected between the pen pad PD and the power supply unit PSU and turn on in response to a second selection signal SEL2 to connect the pen pad PD and the power supply unit PSU. The first switch SW1 and the second switch SW2 may be implemented with transistors. However, this is merely illustrative, and the inventive concept is not limited thereto.

[0139] The pen detection block PDB may include an amplifier AMP, a decoder DEC, and a low-pass filter LPF (or a low-frequency pass filter). The amplifier AMP may amplify a sensing signal provided from the pen sensor unit PSP through the pen pad PD and the switch unit SWU, the decoder DEC may output a specific output signal based on the amplified sensing signal, and the low-pass filter LPF may remove noise components (e.g., high-frequency components) included in the output signal. That is, the pen detection block PDB may constitute a receiving terminal using electromagnetic induction technology.

[0140] Meanwhile, the power supply unit PSU may include a rectifier RECT and a modulator ADC. The rectifier RECT may allow a sensing signal (or an AC current) provided from the pen sensor unit PSP through the pen pad PD and the switch unit SWU to pass through the rectifier RECT only in a specific direction (or only allow a sensing signal having a specific polarity to pass through the rectifier RECT), and the modulator ADC may modulate the output of the rectifier RECT into a signal available in a battery module (or a near-field wireless communication module, etc.) provided in the display device 10.

[0141] Although the case where the switch unit SWU is included in the pen driving circuit PDC is described in Figure 8 , the inventive concept is not limited thereto. For example, the switch unit SWU may be formed in a non-pen sensing area NPDA of the pen detection unit PDU through the same process as the pen sensor unit PSP.

[0142] Figure 9 and Figure 10 showFigure 8 A diagram of the first operation of the pen drive circuit PDC shown in. In Figure 9 the connection relationship between the pen drive circuit PDC and the pen sensor unit PSP in the first mode is shown. In Figure 10 is shown in Figure 9 A waveform diagram of the signal measured in the pen drive circuit PDC shown in.

[0143] In the first mode (or the first operation period), a first selection signal SEL1 having a conduction voltage level can be provided to the first switch SW1, and the first switch SW1 can connect the pen pad PD and the pen detection block PDB. At the same time, the second selection signal SEL2 can have a cut-off voltage level, and the second switch SW2 can be cut off.

[0144] In the first period P1 of the first mode, the scan signal SCAN1 (i.e., the scan signal applied to the first pen scan line PSL1) can have a conduction voltage level (or logic low level) during the entire first period P1. The drive signal Ts can be provided to the first pen line PL1 and includes a plurality of pulses. The frequency of the drive signal Ts (hereinafter, also referred to as the pulse drive signal Ts) can be higher than the frequency of the scan signal SCAN1.

[0145] The first transistor TFT1, which is a PMOS transistor in this configuration, can be turned on in response to the scan signal SCAN1 having a conduction voltage level, and the pulse drive signal Ts can be provided to the gate electrode of the second transistor TFT2. The second transistor TFT2 can provide an AC current to the pen sensor PS by repeatedly turning on and off in response to the pulse drive signal Ts. The first electromagnetic field MF1 can be generated by the pen sensor unit PSP due to the fluctuation of the current provided to the pen sensor PS by the second transistor TFT2. When the pen 20 is adjacent to the pen sensor PS within a specific distance, the resonant circuit 23 of the pen 20 can resonate through the first electromagnetic field MF1 generated by the pen sensor unit PSP to maintain the resonant frequency for a certain period of time, and the pen 20 can output a second electromagnetic field MF2.

[0146] As Figure 10 shown in, in the second period P2 of the first mode, the scan signal SCAN1 can change to have a cut-off voltage level (or logic high level) for the PMOS transistor, and the sense scan signal SCAN2 (i.e., the scan signal applied to the second pen scan line PSL2) can have a conduction voltage level.

[0147] The first transistor TFT1 can be turned off in response to a scan signal SCAN1 having a cut-off voltage level, and the second transistor TFT2 can be turned off. The third transistor TFT3 can be turned on in response to a sense scan signal SCAN2 having a turn-on voltage level (logic low level). Meanwhile, a sense signal Rs can be generated in the pen sensor PS by a second electromagnetic field MF2 output by the pen 20 during a second period P2. The sense signal Rs can be provided to a second pen line PL2 through the third transistor TFT3 after the pen 20 is engaged with the pen sensor PS.

[0148] Since the first switch SW1 connects the pen pad PD and the pen detection block PDB, the sense signal Rs can be provided to the pen detection block PDB. The pen detection block PDB can detect the contact of the pen 20 with the pen sensor PS and the coordinates of the contact.

[0149] Figure 11 and Figure 12 is a diagram showing Figure 8 the second operation of the pen drive circuit PDC shown in Figure 11 The connection relationship between the pen drive circuit PDC and the pen sensor unit PSP in the second mode is shown in Figure 12 and the waveform diagram of the signal measured in the pen drive circuit PDC is shown in

[0150] In the second mode (or the second operation period), a second selection signal SEL2 having a turn-on voltage level can be provided to the second switch SW2, and the second switch SW2 can connect the pen pad PD to the power supply unit PSU. Meanwhile, the first selection signal SEL1 can have a cut-off voltage, and the first switch SW1 can be turned off.

[0151] As Figure 12 shown in

[0152] Meanwhile, the third electromagnetic field MF3 can be generated by the electromagnetic induction device CC outside the pen 20. When the pen sensor unit PSP is adjacent to the electromagnetic induction device CC of the pen 20 within a specific distance, an induced current can be generated in the pen sensor PS. However, since the third transistor TFT3 is in the cut-off state during the first time period P1_1 in response to the sensing scan signal SCAN2 having a cut-off voltage level, no individual sensing signal Rs can be detected in the second pen line PL2.

[0153] In the second time period P2_1 of the second mode, the sensing scan signal SCAN2 (i.e., the scan signal applied to the second pen scan line PSL2) can have a conduction voltage level. The second time period P2_1 can correspond to the second time period P2 of the first mode.

[0154] The third transistor TFT3 can be turned on in response to the sensing scan signal SCAN2 having a conduction voltage level, and the sensing signal Rs generated in the pen sensor PS by the electromagnetic induction device CC can be provided to the second pen line PL2 through the third transistor TFT3. Therefore, in the first mode and the second mode, the sensing signal Rs can be transmitted to the pen pad PD during the second time period P2 or P2_1.

[0155] Since the second switch SW2 connects the pen pad PD and the power supply unit PSU, the power supply unit PSU can operate based on the sensing signal Rs. Therefore, the pen sensor unit PSP can transmit the sensing signal Rs caused by the proximity between the pen sensor PS and the pen 20.

[0156] As described with reference to Figures 9 to 12 the pen sensor PS of the pen sensor unit PSP can be used to detect the pen 20 in the first mode and to generate an induced current in the pen sensor PS based on the proximity to the external electromagnetic induction device CC in the second mode. That is, various electromagnetic induction modules (i.e., wireless charging modules, near-field wireless communication modules, magnetic safety transmission modules, etc.) provided in the display device 10 (see Figure 1 ) can operate using the pen sensor PS of the pen detection unit PDU. Therefore, the space, cost, etc. of the antenna for implementing the electromagnetic induction module in the display device 10 can be reduced.

[0157] Figure 13 is a diagram showing another example of the pen detection unit PDU included in the Figure 2 display device 10 shown in

[0158] Referring to Figure 5 and Figure 13 , except that Figure 13 the pen detection unit PDU shown in Figure 13The pen detection unit PDU shown in is substantially the same as or similar to the pen detection unit PDU shown in, and thus, overlapping descriptions will not be repeated. Figure 5 The pen detection unit PDU shown in is substantially the same as or similar to the pen detection unit PDU shown in, and thus, overlapping descriptions will not be repeated.

[0159] The loop antenna WCC can be disposed in the non - pen - sensing area NPDA of the pen detection unit PDU, extend along the edge of the pen detection unit PDU, and have a shape wound at least once. For example, the loop antenna WCC can be formed by the same process as at least one of the gate electrode, source electrode (or first electrode), and drain electrode (or second electrode) of the transistor in the pen sensor part PSP, and be formed of the same material as at least one of the gate electrode, source electrode (or first electrode), and drain electrode (or second electrode) of the transistor in the pen sensor part PSP.

[0160] The auxiliary pad DPD (or second pen pad) can be formed on the side of the pen detection unit PDU where the pen pad PD (or first pen pad) is disposed, and the pen drive circuit PDC can be connected to the loop antenna WCC through the auxiliary pad DPD. In addition to the pen sensor PS, the loop antenna WCC can also be a sensing part of the display unit DU.

[0161] The pen drive circuit PDC can connect the auxiliary pad DPD to the power supply unit PSU. For example, the pen drive circuit PDC (or flexible printed circuit FPC) can connect the auxiliary pad DPD to the power supply unit PSU through a connection line.

[0162] In some embodiments, the pen drive circuit PDC can control the connection structure between the auxiliary pad DPD, the pen pad PD, and the power supply unit PSU.

[0163] For example, in the first mode, the pen drive circuit PDC can connect the auxiliary pad DPD to the power supply unit PSU and interrupt the connection between the auxiliary pad DPD and the power supply unit PSU. In the second mode, the pen drive circuit PDC can connect the auxiliary pad DPD, the pen pad PD, and the power supply unit PSU. For example, the pen drive circuit PDC can connect the loop antenna WCC and the pen sensor PS (see Figure 6 ) in series with the power supply unit PSU. The power supply unit PSU can use the loop antenna WCC and the pen sensor PS, thereby improving the operation efficiency of the power supply unit PSU (e.g., the charging efficiency of the power supply unit PSU).

[0164] Meanwhile, although the case where the loop antenna WCC is included in the pen detection unit PDU is shown in Figure 13 , the loop antenna WCC is not limited thereto.

[0165] Figure 14 shows the case included in Figure 2A diagram showing an example of a touch detection unit TDU in the display device 10 shown.

[0166] Referring to Figure 4 and Figure 14 except that Figure 14 the touch detection unit TDU shown in Figure 14 also includes a loop antenna WCC (and an auxiliary pad DPD), Figure 4 the touch detection unit TDU shown in

[0167] Referring to Figure 13 and Figure 14 , Figure 14 the loop antenna WCC and the auxiliary pad DPD shown in Figure 13 can be substantially the same as or similar to the loop antenna WCC and the auxiliary pad DPD described with reference to

[0168] The loop antenna WCC can be disposed in a non-touch sensing area NTDA of the touch detection unit TDU, extend along the edge of the touch detection unit TDU, and have a shape that winds at least once.

[0169] The loop antenna WCC can be formed by the same process as at least one of the touch electrodes TE and RE and the connection electrode BE, and be formed of the same material as at least one of the touch electrodes TE and RE and the connection electrode BE.

[0170] For example, most of the loop antenna WCC can be formed by the same process as the connection electrode BE (and the first driving line TL1 and the second driving line TL2), and the portion of the loop antenna WCC that overlaps with the first driving line TL1 and the second driving line TL2 can be formed by the same process as the touch electrodes TE and RE.

[0171] The power supply unit PSU can be connected to the loop antenna WCC through the auxiliary pad DPD.

[0172] In the pen detection unit PDU and the display device 10 including the same according to the present disclosure, the pen sensor PS provided in the pen sensing module generally serves as an antenna for various modules including a wireless charging module, or an antenna of a specific module is embedded in another module (or integrated with another module), so that the thickness and manufacturing cost of the display device 10 can be reduced.

[0173] Although the present invention has been described in conjunction with preferred embodiments, those skilled in the art will understand that various modifications and variations can be made thereto without departing from the spirit and scope of the invention defined by the appended claims.

[0174] Accordingly, the scope of the invention should not be limited by the specific embodiments described herein, but should be defined by the appended claims and their equivalents.

Claims

1. A pen detection unit, the pen detection unit comprising: A pen detection panel including a plurality of pen sensor portions each including a first loop antenna and at least one transistor connected to the first loop antenna; And A pen driving circuit configured to detect the position of a pen adjacent to one of the plurality of pen sensor portions based on a first electromagnetic field generated through the first loop antenna in a first mode, and configured to receive a sensing signal based on an external electromagnetic induction device and transmit the sensing signal to a power supply unit in a second mode different from the first mode.

2. The pen detection unit according to claim 1, wherein, The pen includes a resonant circuit configured with at least one capacitor and at least one inductor.

3. The pen detection unit according to claim 1, wherein, The power supply unit includes at least one of a wireless charging module, a near field communication module, and a magnetic safety transmission module.

4. The pen detection unit according to claim 1, wherein, The pen detection panel further includes: A first scan line connected to the gate electrode of the at least one transistor; and A readout line connected to the first loop antenna, and Wherein, the plurality of pen sensor portions are respectively disposed in a region defined by the first scan line and the readout line.

5. The pen detection unit according to claim 4, wherein, The first loop antenna has a spiral shape in a plane.

6. The pen detection unit according to claim 5, wherein, The spiral shape has a width of 1 mm to 10 mm.

7. The pen detection unit according to claim 5, wherein The pen detection panel further includes: A second scan line; and A driving line, and Wherein, the at least one transistor includes: A first transistor including a first electrode connected to the driving line and a gate electrode connected to the first scan line; and A second transistor including a first electrode connected to a first driving voltage line, a second electrode connected to one end of the first loop antenna, and a gate electrode connected to the second electrode of the first transistor.

8. The pen detection unit according to claim 7, wherein, The at least one transistor further includes: A third transistor including a first electrode connected to the one end of the first loop antenna, a second electrode connected to the readout line, and a gate electrode connected to the second scan line.

9. The pen detection unit according to claim 8, wherein, The pen driving circuit includes: A pen detection block configured to detect the position of the pen based on the first electromagnetic field; and A switch block configured to connect the readout line to the pen detection block in the first mode and connect the readout line to the power supply unit in the second mode.

10. A display device, the display device comprising: A display panel including pixels; A pen detection unit disposed on one surface of the display panel; And A power supply unit configured to supply driving power to the display panel, Wherein, the pen detection unit includes: a pen detection panel including a plurality of pen sensor portions each including a first loop antenna and at least one transistor connected to the first loop antenna; and a pen driving circuit configured to detect the position of a pen adjacent to one of the plurality of pen sensor portions based on a first electromagnetic field generated through the first loop antenna in a first mode, and configured to transmit a sensing signal to the power supply unit in a second mode different from the first mode.

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