Display device

Abstract

A display device including a digitizer is disclosed. The display device including a folding area and a non-folding area includes a display panel including a plurality of pixels, and a digitizer disposed at a side of the display panel and including a plurality of loop coils, wherein, when a hovering event of an input unit is detected in the folding area, the digitizer increases an alternating current signal applied to at least one loop coil disposed in the folding area among the plurality of loop coils, and calculates a hovering height of the input unit based on a change in a magnetic field between the input unit and the loop coils among the plurality of loop coils including a loop coil overlapping the input unit and an adjacent loop coil surrounding the input unit.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Korean Patent Application No. 10-2020-0121796, filed on September 21, 2020, and all benefits arising therefrom, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] One or more embodiments relate to a display device, and more specifically, to a display device including a digitizer. Background Technology

[0004] Electronic devices that provide images to users (such as smartphones, digital cameras, laptops, navigation devices, and smart TVs) include display devices that display images. Display devices generate images and provide them to users via a screen.

[0005] Recently, with the advancement of display device technology, various forms of display devices have been developed. Flexible display devices, including foldable, rollable, or bendable models, are under development. Flexible display devices are easy to carry and enhance user convenience. Summary of the Invention

[0006] One or more embodiments include a foldable display device that includes a digitizer capable of detecting the precise position of an input unit.

[0007] Additional features will be set forth in part in the description which follows, and in part will be apparent from the description, or may be learned by practicing the presented embodiments of the invention.

[0008] According to one or more embodiments, a display device including a folded region and a non-folded region includes: a display panel including a plurality of pixels; and a digitizer disposed on one side of the display panel and including a plurality of loop coils, wherein, when a hovering event of an input unit is detected in the folded region, the digitizer amplifies an AC signal applied to at least one loop coil disposed in the folded region among the plurality of loop coils, and calculates the hovering height of the input unit based on a change in the magnetic field between the input unit and the loop coils among the plurality of loop coils, the loop coils among the plurality of loop coils including a loop coil overlapping the input unit and an adjacent loop coil surrounding the input unit.

[0009] In one embodiment, the plurality of loop coils may have a first width and a first thickness in the folded region and a second width and a second thickness in the unfolded region, wherein the second width is less than the first width and the second thickness is greater than the first thickness.

[0010] In an implementation, each of the plurality of loop coils may have a linear shape.

[0011] In one implementation, each of the plurality of loop coils may have a zigzag shape.

[0012] In one implementation, each of the plurality of loop coils may have a linear shape in the non-folded region and a zigzag shape in the folded region.

[0013] In one embodiment, at least one of the multiple loop coils arranged in the folded region may define multiple through holes.

[0014] In one embodiment, the plurality of loop coils may include a first portion corresponding to a folded region and a second portion corresponding to an unfolded region, and the end portion of the first portion may contact the end portion of the second portion.

[0015] In one embodiment, the end portions of the first portion of a plurality of loop coils may overlap the end portions of the second portion.

[0016] In one embodiment, the end portions of the first portion of a plurality of loop coils may overlap below the end portions of the second portion.

[0017] In an implementation, the plurality of loop coils may include a first portion corresponding to a folded region and a second portion corresponding to an unfolded region, and the first and second portions may be configured as a single body.

[0018] In one implementation, when a hovering event of the input unit is detected in the folded area, the digitizer can extend the folded area.

[0019] In one implementation, the digitizer can increase the AC voltage applied to at least one of the multiple toroidal coils arranged in an extended folded region.

[0020] In one embodiment, the digitizer can increase the AC voltage applied to at least one of a plurality of loop coils, the at least one loop coil being arranged within an extended folded region extending a predetermined range from the location of the input unit.

[0021] According to one or more embodiments, a display device including a folded region and a non-folded region includes a digitizer comprising a plurality of loop coils, wherein the plurality of loop coils have a first width and a first thickness in the folded region and a second width and a second thickness in the non-folded region, the second width being less than the first width and the second thickness being greater than the first thickness, wherein when a hover event of an input unit is detected in the folded region, the digitizer amplifies an AC signal applied to at least one loop coil arranged in the folded region.

[0022] In an implementation, each of the plurality of loop coils may have a linear shape.

[0023] In one implementation, each of the plurality of loop coils may have a zigzag shape.

[0024] In one implementation, each of the plurality of loop coils may have a linear shape in the non-folded region and a zigzag shape in the folded region.

[0025] In one embodiment, at least one of the multiple loop coils arranged in the folded region may define multiple through holes.

[0026] In one implementation, when a hovering event of the input unit is detected in the folded region, the digitizer can extend the folded region, and the digitizer can increase the AC voltage applied to at least one of the multiple loop coils arranged in the extended folded region.

[0027] In one embodiment, the digitizer can increase the AC voltage applied to at least one of a plurality of loop coils, the at least one loop coil being arranged within an extended folded region extending a predetermined range from the location of the input unit. Attached Figure Description

[0028] The above and other features and advantages of the predetermined embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0029] Figure 1A and Figure 1B These are perspective views schematically illustrating an embodiment of the display device before folding;

[0030] Figure 2 This is a schematic cross-sectional view of an embodiment of the display device;

[0031] Figure 3 It is shown schematically. Figure 2 A cross-sectional view of the structure of a digitizer;

[0032] Figure 4This is a cross-sectional view schematically illustrating an embodiment of the display panel;

[0033] Figure 5A and Figure 5B This is an equivalent circuit diagram schematically illustrating an implementation of any pixel of the display panel;

[0034] Figure 6 This is a schematic diagram illustrating the implementation of a digitizer;

[0035] Figure 7 yes Figure 6 An enlarged view of part A of the digitizer shown;

[0036] Figure 8A and Figure 8B yes Figure 7 An enlarged view of part B of the loop coil shown;

[0037] Figure 9A and Figure 9B yes Figure 7 An enlarged view of portion C of the loop coil shown;

[0038] Figure 10 It is a diagram used to describe the distance between the lines of the first loop coil;

[0039] Figures 11A to 11D This is a diagram illustrating an implementation of a method for manufacturing a toroidal coil;

[0040] Figures 12A to 12D This is a diagram illustrating an implementation of a method for manufacturing a toroidal coil;

[0041] Figures 13A to 13D This is a diagram illustrating an implementation of a method for manufacturing a toroidal coil;

[0042] Figures 14A to 14E This is a diagram illustrating an embodiment of the toroidal coil;

[0043] Figure 15 This is a schematic diagram illustrating the implementation of a digitizer;

[0044] Figure 16 This is a schematic diagram illustrating the driving of the digitizer;

[0045] Figure 17 This is a flowchart of the implementation method for driving the digitizer; and

[0046] Figure 18 This is a diagram used to describe an implementation of the extended folded region. Detailed Implementation

[0047] Reference will now be made in detail to embodiments, examples of which are shown in the accompanying drawings, wherein the same reference numerals denote the same elements throughout the text. In this respect, embodiments may take different forms and should not be construed as limited to the description set forth herein. Therefore, embodiments are described below only with reference to the accompanying drawings to explain the described features. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Throughout the disclosure, the expression “at least one of a, b, and c” means only a, only b, only c, both a and b, both a and c, both b and c, all of a, b, and c, or variations thereof.

[0048] Because this disclosure can have various modifications and several embodiments, embodiments are shown in the accompanying drawings and will be described in detail thereto. The effects and features of this disclosure, as well as the ways in which they are implemented, will become apparent from the embodiments described in detail later with reference to the accompanying drawings. However, this disclosure is not limited to the following embodiments, but can be implemented in various forms.

[0049] It will be understood that although the terms “first,” “second,” etc., may be used in this document to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another.

[0050] In the following implementation, the singular form includes the plural form, unless the context explicitly indicates otherwise.

[0051] In this specification, it will be understood that terms such as “comprising” or “having” are intended to indicate the presence of a feature or element disclosed in this specification and are not intended to exclude the possibility that one or more other features or elements may be added.

[0052] In the following embodiments, it will be understood that when a portion such as a layer, region, or element is referred to as being "on" or "above" another portion, it may be directly on or above the other portion, or there may be an intermediate portion.

[0053] Furthermore, the dimensions of elements may be exaggerated or reduced in the accompanying drawings for ease of description. For example, since the dimensions and thicknesses of the elements in the drawings are arbitrarily shown for ease of explanation, the following embodiments are not limited thereto.

[0054] In this specification, "A and / or B" means A, B, or A and B. Furthermore, in this specification, "at least one of A and B" means A, B, or A and B.

[0055] In the following embodiments, the description of a line "extending in a first direction or a second direction" includes not only lines extending in a linear form, but also lines extending in a zigzag or curved shape in the first or second direction.

[0056] In the following embodiments, the expression "in a plan view" refers to the object viewed from above, and the expression "in a cross-section" refers to a cross-section of a vertically cut object viewed from the side. In the following embodiments, when the first element is described as "overlapping" with the second element, this means that the first element is located above or below the second element.

[0057] As used herein, “about” or “approximately” includes the value and the average of the values ​​within an acceptable range of deviations from the particular value determined by a person of ordinary skill in the art when taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., limitations of the measurement system). For example, “about” may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the value.

[0058] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will also be understood that terms (such as those defined in commonly used dictionaries) shall be interpreted as having the same meaning as they have in the context of the relevant technology and the invention, and shall not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0059] Figure 1A and Figure 1B These are perspective views schematically illustrating an embodiment of the display device before folding.

[0060] In this embodiment, the display device may be foldable or flexible. The display device may be configured in various shapes, such as a quadrilateral (e.g., rectangular) plate shape with two pairs of parallel sides. When the display device is configured as a rectangular plate shape, one pair of sides may be longer than the other pair. In this embodiment, for ease of description, a display device with a rectangular shape is described, having a pair of long sides and a pair of short sides. The direction of extension of the short sides is represented by a first direction D1, the direction of extension of the long sides is represented by a second direction D2, and the direction perpendicular to the extension directions of the long and short sides is represented by a third direction D3.

[0061] In embodiments, the shape of the display device is not limited to the shapes described above, but can be various shapes. In embodiments, the display device can be configured in various shapes, such as a closed polygon including linear edges, a circle or ellipse including curved edges, a semicircle or semi-ellipse including straight and curved edges, etc. In embodiments, when the display device has linear edges, at least one edge of each shape can be curved. In embodiments, when the display device has a rectangular shape, the portion where adjacent linear edges meet can be replaced by a curve with a predetermined curvature. That is, the vertex portion of the rectangular shape can be a curve, with its two adjacent ends respectively connected to two adjacent linear edges and having a predetermined curvature. The curvature can be set differently depending on the position. In embodiments, the curvature can vary depending on, for example, the starting position of the curve and the length of the curve.

[0062] refer to Figure 1A and Figure 1B The display device 10 may include a display area DA and a peripheral area PA outside the display area DA. The display area DA is the area in which a plurality of pixels PX are arranged to display an image. The peripheral area PA is a non-display area surrounding the display area DA and in which no pixels are arranged. The upper surface of the display device 10 on a third-direction D3 may be defined as a display surface, and the display surface may include the display area DA and the peripheral area PA, and the image may be provided to the user via the display area DA.

[0063] Various electronic components or printed circuit boards (“PCBs”) can be electrically attached to the peripheral area PA, and voltage lines supplying power to drive the display elements can be provided in the peripheral area PA. In embodiments, for example, a scan driver that provides scan signals to each pixel PX, a data driver that provides data signals to each pixel PX, supply lines (clock signal lines, carry signal lines, drive voltage lines, etc.) through which signals input to the scan driver and the data driver are transmitted, and main power lines can be arranged in the peripheral area PA.

[0064] At least a portion of the display device 10 may be flexible, and the flexible portion of the display device 10 may be foldable. That is, the display device 10 may include a flexible and foldable folded region FA and an undisturbed non-folded region NFA disposed at least on one side of the folded region FA. Although in the embodiment, the undisturbed region is referred to as the non-folded region, this is merely for ease of description, and the expression "non-folded" includes not only the case where a portion of the display device is rigid and not flexible, but also the case where a portion of the display device is flexible but not as flexible as the folded region FA, or the case where a portion of the display device is flexible but not foldable. The display device 10 may display an image in the display area DA within the folded region FA and the non-folded region NFA.

[0065] Although for ease of description, the first non-folded region NFA1 and the second non-folded region NFA2 are described as regions that are similar to each other, and a folded region FA is shown as being between the two non-folded regions ( Figure 1A The first non-folded region NFA1 and the second non-folded region NFA2 are located between them, but the invention is not limited thereto. In embodiments, for example, the first non-folded region NFA1 and the second non-folded region NFA2 may have different regions. Furthermore, as... Figure 1B As shown, one or more folded regions FA may be included. In this case, multiple non-folded regions NFA1, NFA2, and NFA3 can be separated from each other, and folded regions FA1 and FA2 are located between them. Folded regions FA, FA1, and FA2 can be folded relative to folding lines FL, FL1, and FL2, respectively, and multiple folding lines FL, FL1, and FL2 can be provided. Folding lines FL, FL1, and FL2 are provided in folded regions FA, FA1, and FA2 in a first direction D1, which is the extension direction of folded regions FA, FA1, and FA2, and therefore, display device 10 can be folded in folded regions FA, FA1, and FA2.

[0066] exist Figure 1A and Figure 1B In the original design, fold lines FL, FL1, and FL2 pass through the centers of folded regions FA, FA1, and FA2, and folded regions FA, FA1, and FA2 are symmetrical with respect to fold lines FL, FL1, and FL2. However, the invention is not limited to this. That is, fold lines FL, FL1, and FL2 may be asymmetrically arranged in folded regions FA, FA1, and FA2. Folded regions FA, FA1, and FA2, as well as fold lines FL, FL1, and FL2 of folded regions FA, FA1, and FA2, may overlap with the area of ​​the display device 10 in which an image is displayed, and the image display portion may be folded when the display device 10 is folded.

[0067] In another embodiment, the entire area of ​​the display device 10 may correspond to a folded area (e.g., FA). In the case of a display device that is rollable like a scroll, for example, the entire area of ​​the display device 10 may correspond to a folded area (e.g., FA).

[0068] like Figure 1A and Figure 1B As shown, the display device 10 can be unfolded flat as a whole.

[0069] In one embodiment, the display device 10 can be folded such that its display surfaces face each other relative to the fold line FL. In another embodiment, the display device 10 can be folded relative to the fold line FL such that its display surface faces outward. Here, "display surface" refers to the surface on which an image is displayed, and the display surface includes the display area DA and the peripheral area PA. The term "fold" indicates that the shape is not fixed, but can be deformed from one shape to another, and includes curved, rolled-up, or folded shapes along one or more specific lines (i.e., fold lines). Therefore, in one embodiment, the display device 10 can be folded such that one of the first surfaces of the two non-folded areas NFA1 and NFA2 faces the other, while the first surfaces are parallel to each other. In another embodiment, the display device 10 can be folded such that the first surfaces of the two non-folded areas NFA1 and NFA2 are tilted at a predetermined angle (e.g., an acute angle, a right angle, or an obtuse angle), and the folded area FA is between them.

[0070] In implementations, the display device 10 may be, for example, a smartphone, mobile phone, game player, TV, display device, head unit for a vehicle, laptop computer, laptop computer, tablet computer, personal media player (“PMP”), or personal digital assistant (“PDA”).

[0071] Figure 2 This is a schematic cross-sectional view of an embodiment of the display device. Figure 3 It is shown schematically. Figure 2 A cross-sectional view of the structure of the digitizer.

[0072] refer to Figure 2 The display device 10 may include a display panel DP, a touch sensing unit TSU disposed on the display panel DP, a window WIN disposed on the touch sensing unit TSU, and a digitizer DT disposed below the display panel DP.

[0073] The display panel DP may include a substrate SUB, a pixel layer PXL on the substrate SUB, and a thin-film encapsulation layer TFEL disposed above the substrate SUB to cover the pixel layer PXL. The display panel DP may be an organic light-emitting display panel. However, the present invention is not limited thereto, and various image display panels that display images, such as inorganic light-emitting display panels, liquid crystal display panels, electrowetting display panels, and electrophoretic display panels, can be used as the display panel DP.

[0074] In this embodiment, the substrate SUB may include an insulating material such as glass, quartz, or polymer resin. The substrate SUB may be a rigid substrate or a flexible substrate that is bendable, foldable, or rollable.

[0075] The pixel layer PXL can be arranged in the display area DA. Pixel circuitry, including thin-film transistors, light-emitting elements as display components, and insulating layers, can be arranged in the pixel layer PXL.

[0076] The thin-film encapsulation layer TFEL may include at least one inorganic encapsulation layer and at least one organic encapsulation layer. In an embodiment, the thin-film encapsulation layer TFEL may have a stacked structure including a first inorganic encapsulation layer / an organic encapsulation layer / a second inorganic encapsulation layer.

[0077] Display device 10 can receive at least one user input via a user's body part (e.g., a finger) or an input unit (e.g., a stylus or electronic pen). Display device 10 can detect touch events from user input.

[0078] The touch functionality according to the present invention is not limited to contact between the display device 10 and a finger or input unit, but may also include non-contact (e.g., detecting the user input device within a certain distance or interval (e.g., 1 cm) from the surface of the display device 10 without directly contacting the display device 10). The distance or interval within the display device 10 where the user input device can be detected may vary depending on the performance or structure of the display device 10.

[0079] When a touch event is detected, in order to distinguish between a direct touch event and an indirect touch event (i.e., a hover event) that occurs through contact with the user's input device, the display device 10 can output different detection values ​​(e.g., including voltage or current values ​​as analog values) depending on whether the touch event is a direct touch event or a hover event.

[0080] Display device 10 may include at least two touch panels for detecting finger input and pen input respectively, thereby enabling the detection of input via a first user input device (such as the body part of a finger) (i.e., finger input) and input via an input unit that serves as a second user input device (i.e., pen input). The at least two touch panels may provide different output values ​​to a controller, and the controller may differentiate between input values ​​from the at least two touch panels to distinguish whether the input from display device 10 is via a finger or via an input unit.

[0081] In one embodiment, the display device 10 may include a touch sensing unit TSU (first touch panel) for detecting finger input and a digitizer DT (second touch panel) for detecting pen input.

[0082] A touch sensing unit (TSU) may include touch electrodes and wires connected to the touch electrodes. The touch sensing unit (TSU) can detect external input using either self-capacitance or mutual capacitance methods.

[0083] The touch sensing unit (TSU) can be disposed on the thin-film encapsulation layer (TFEL). In an alternative embodiment, the touch sensing unit (TSU) can be disposed separately on the touch substrate and then bonded to the thin-film encapsulation layer (TFEL) via an adhesive layer such as an optically clear adhesive (“OCA”). In another embodiment, the touch sensing unit (TSU) can be disposed directly on the thin-film encapsulation layer (TFEL), and in this case, there may be no adhesive layer between the touch sensing unit (TSU) and the thin-film encapsulation layer (TFEL).

[0084] A digitizer (DT) is a type of touch panel that detects pen input to receive positional information indicated by a user on a display surface. The digitizer DT can convert analog signals received by detecting hovering of the input unit or pen pressure into digital signals to allow input, storage, output, or manipulation of visual images. The digitizer DT can be implemented using electromagnetic or electromagnetic resonance methods. In some implementations, the digitizer DT may include, for example, a sensor substrate comprising multiple coils. The digitizer DT can determine the pen position by detecting electromagnetic changes caused by pen proximity. The digitizer DT need not be disposed on the front surface of the display panel (DP), but can also be disposed below the rear surface of the display panel (DP).

[0085] Let's refer to each other. Figure 3 The digitizer DT may include a sensor substrate SS and a magnetic layer ML disposed on the rear surface of the sensor substrate SS. Multiple ring coils are disposed on the sensor substrate SS.

[0086] The sensor substrate SS may include a first circuit layer CL1, a second circuit layer CL2, and a cover layer 430. The first circuit layer CL1 may include a first conductive layer disposed on the surface of the first substrate layer 410. The second circuit layer CL2 may include a second conductive layer disposed on the surface of the second substrate layer 420. The thickness TH1 of the first conductive layer of the first circuit layer CL1 and the second conductive layer of the second circuit layer CL2 in the folded region FA may be less than their thickness TH2 in other regions besides the folded region FA.

[0087] In an embodiment, the first substrate layer 410 and the second substrate layer 420 may be insulating layers and may include, for example, polyimide (“PI”).

[0088] In an embodiment, the first conductive layer of the first circuit layer CL1 and the second conductive layer of the second circuit layer CL2 may include a plurality of loop coils, and these loop coils may include metallic materials such as copper (Cu), aluminum (Al), molybdenum (Mo), silver (Ag), etc. The width and thickness of the loop coils arranged in the folded region FA may differ from the width and thickness of the loop coils arranged in the non-folded region NFA (excluding the folded region FA). In an embodiment, the width of the loop coils arranged in the folded region FA may be greater than the width of the loop coils arranged in the non-folded region NFA, and the thickness of the loop coils arranged in the folded region FA may be less than the thickness of the loop coils arranged in the non-folded region NFA.

[0089] The digitizer DT using the electromagnetic resonance (“EMR”) method requires high current to detect hovering events, and therefore requires low-resistance wire. Furthermore, when the wire thickness in the folded region FA is relatively thick, wire cracks may occur during folding, which in turn increases resistance and degrades event detection performance.

[0090] In this implementation, the arrangement of the wire (loop coil) in the folded region FA can be minimized, and a loop coil with a thickness smaller than that of the loop coil arranged in the folded region NFA can also be arranged in the folded region FA to prevent cracking. Furthermore, to reduce the increase in resistance due to the reduced thickness of the loop coil, the width of the loop coil arranged in the folded region FA can be set to be greater than the width of the loop coil arranged in the non-folded region NFA.

[0091] In one embodiment, the first circuit layer CL1 and the second circuit layer CL2 may be adhered to each other using a first adhesive layer 450, such as a pressure-sensitive adhesive (“PSA”), a thermosetting adhesive, etc. The first adhesive layer 450 may be located between the first substrate layer 410 and the second circuit layer CL2.

[0092] In one embodiment, the cover layer 430 may include a PI layer, and a second adhesive layer 460, such as a PSA layer or a thermosetting adhesive, may be adhered to the first circuit layer CL1. The second adhesive layer 460 may be located between the cover layer 430 and the first circuit layer CL1.

[0093] When the amplitude of the magnetic field applied to the digitizer DT decreases, the maximum distance at which the digitizer DT identifies the input unit within it shortens, thereby increasing the likelihood of digitizer DT failure. The magnetic layer ML can mitigate the decrease in magnetic field amplitude by preventing destructive interference caused by conductive elements arranged around the digitizer DT.

[0094] The magnetic layer ML may include a magnetic material that senses the electromagnetic field of the sensor substrate SS. The magnetic layer ML may include an amorphous metal with highly magnetic properties. The magnetic layer ML may have a structure in which metallic magnetic powder in the form of thin, sheet-like plates (referred to as flakes) is irregularly (or randomly) distributed in an insulating and / or adhesive resin substrate material. That is, the magnetic layer ML may include non-oriented magnetic powder. In an embodiment, a thermosetting bonding process may be performed on the magnetic layer ML, and thus, the magnetic powder may be aligned (i.e., oriented) in a predetermined direction to improve the properties of the magnetic layer ML before it is oriented.

[0095] The magnetic layer ML can be provided by: deforming a magnetic powder, such as ferrite, molybdenum alloy powder (“MPP”), Fe-Si-Al alloy powder (aluminum-silicon-iron powder) or Ni-Fe alloy powder (Highflux), into a sheet; adding the deformed magnetic powder to an insulating and / or adhesive resin (or adhesive) and distributing the magnetic powder therein; and coating the surface of the cover layer 430 with a resin in which the magnetic powder is distributed.

[0096] The window (WIN) can be positioned above the display panel (DP) to protect it. The window (WIN) can be attached to the touch sensing unit (TSU) using an OCA adhesive.

[0097] Although not shown in the accompanying drawings, an optical functional layer may also be included between the touch sensing unit (TSU) and the window (WIN). The optical functional layer may include an anti-reflective layer. The anti-reflective layer reduces the reflectivity of light (external light) incident on the display panel (DP) from the outside. In some embodiments, the optical functional layer may be a polarizing film. In another embodiment, the optical functional layer may include a color filter comprising a black matrix and a color filter.

[0098] Figure 4 This is a cross-sectional view schematically illustrating an embodiment of the display panel.

[0099] refer to Figure 4The display panel (DP) can include the display area (DA) and the peripheral area (PA). Figure 4 A substrate 100 of a display panel DP is shown, and the substrate 100 may include a display area DA and a peripheral area PA.

[0100] The display panel (DP) may include multiple pixels (PX) arranged in the display area (DA).

[0101] The scan driver 1100 provides scan signals to the pixel circuit connected to the pixel PX, the data driver 1200 provides data signals to the pixel circuit connected to the pixel PX, and the main power supply line (not shown) for providing drive voltage and common voltage to the pixel circuit can be arranged in the peripheral area PA.

[0102] When data drive 1200 is arranged with Figure 4 In another embodiment, when one side of the substrate 100 is adjacent, the data driver 1200 may be arranged on a flexible PCB (“FPCB”) electrically connected to one side of the display panel DP.

[0103] Figure 5A and Figure 5B This is an equivalent circuit diagram schematically illustrating an implementation of any pixel of the display panel.

[0104] like Figure 5A As shown, the pixel PX, serving as a display element, may include an organic light-emitting diode (OLED), and the OLED may be connected to a pixel circuit PC. The pixel circuit PC may include a first transistor T1, a second transistor T2, and a capacitor Cst. In this embodiment, the pixel PX may emit light, for example, red, green, blue, or white, from the OLED.

[0105] The second transistor T2 can be a switching transistor and is connected to the scan line SL and the data line DL. It can transmit the data voltage received from the data line DL to the first transistor T1 based on the switching voltage received from the scan line SL. The capacitor Cst can be connected to the second transistor T2 and the drive voltage line PL. It can store a voltage corresponding to the difference between the voltage received from the second transistor T2 and the drive voltage ELVDD supplied to the drive voltage line PL.

[0106] The first transistor T1 can be a driving transistor and is connected to the driving voltage line PL and the capacitor Cst. The driving current flowing from the driving voltage line PL to the organic light-emitting diode (OLED) can be controlled according to the voltage value stored in the capacitor Cst. The OLED can emit light of a predetermined brightness according to the driving current. The opposite electrode (e.g., the cathode) of the OLED can receive a common voltage ELVSS.

[0107] Although about Figure 5A The pixel circuit PC is described as including two transistors and one capacitor, but the invention is not limited thereto. The number of transistors and the number of capacitors can be modified in various ways depending on the design of the pixel circuit PC.

[0108] like Figure 5B As shown, the pixel circuit PC may include first transistors T1 through seventh transistors T7 and a capacitor Cst. Depending on the transistor type (p-type or n-type) and / or the transistor's operating conditions, the first terminal of each of the first transistors T1 through seventh transistors T7 may be a source terminal or a drain terminal, and its second terminal may be a different terminal from the first terminal. In an embodiment, for example, when the first terminal is a source terminal, the second terminal may be a drain terminal.

[0109] The pixel circuit PC can be connected to the first scan line SL through which the first scan signal Sn (n is a natural number) is transmitted, the second scan line SL-1 through which the second scan signal Sn-1 is transmitted, the third scan line SL+1 through which the third scan signal Sn+1 is transmitted, the transmit control line EL through which the transmit control signal En is transmitted, the data line DL through which the data signal Dm (m is a natural number) is transmitted, the drive voltage PL through which the drive voltage ELVDD is transmitted, and the initialization voltage VL through which the initialization voltage Vint is transmitted.

[0110] The first transistor T1 includes a gate terminal connected to the second node N2, a first terminal connected to the first node N1, and a second terminal connected to the third node N3. The first transistor T1 functions as a driving transistor and supplies driving current to the light-emitting element by receiving a data signal Dm according to the switching operation of the second transistor T2. The light-emitting element can be an organic light-emitting diode (OLED).

[0111] The second transistor T2 (switching transistor) includes a gate terminal connected to the first scan line SL, a first terminal connected to the data line DL, and a second terminal connected to the first node N1 (or the first terminal of the first transistor T1). The second transistor T2 can be turned on according to the first scan signal Sn received via the first scan line SL to perform a switching operation to send the data signal Dm sent to the data line DL to the first node N1.

[0112] The third transistor T3 (compensation transistor) includes a gate terminal connected to the first scan line SL, a first terminal connected to the second node N2 (or the gate terminal of the first transistor T1), and a second terminal connected to the third node N3 (or the second terminal of the first transistor T1). The third transistor T3 can be turned on according to the first scan signal Sn received via the first scan line SL, and is connected to the first transistor T1 as a diode to compensate for the threshold voltage of the first transistor T1. The third transistor T3 may have a structure in which two or more transistors are connected in series.

[0113] The fourth transistor T4 (the first initialization transistor) includes a gate terminal connected to the second scan line SL-1, a first terminal connected to the initialization voltage line VL, and a second terminal connected to the second node N2. The fourth transistor T4 can be turned on according to the second scan signal Sn-1 received via the second scan line SL-1 to send the initialization voltage Vint to the gate terminal of the first transistor T1, thereby initializing the gate voltage of the first transistor T1. The fourth transistor T4 may have a structure in which two or more transistors are connected in series.

[0114] The fifth transistor T5 (first emitter control transistor) includes a gate terminal connected to the emitter control line EL, a first terminal connected to the drive voltage line PL, and a second terminal connected to the first node N1. The sixth transistor T6 (second emitter control transistor) includes a gate terminal connected to the emitter control line EL, a first terminal connected to the third node N3, and a second terminal connected to the pixel electrode of the organic light-emitting diode (OLED). When the fifth transistor T5 and the sixth transistor T6 are simultaneously turned on according to the emitter control signal En received through the emitter control line EL, current flows in the organic light-emitting diode (OLED).

[0115] The seventh transistor T7 (the second initialization transistor) includes a gate terminal connected to the third scan line SL+1, a second terminal connected to the sixth transistor T6 and a first terminal connected to the pixel electrode of the OLED, and a second terminal connected to the initialization voltage line VL. The seventh transistor T7 can be turned on according to the third scan signal Sn+1 received via the third scan line SL+1 to send the initialization voltage Vint to the pixel electrode of the OLED, thereby initializing the voltage of the pixel electrode of the OLED. In another embodiment, the seventh transistor T7 can be omitted.

[0116] The capacitor Cst includes a first electrode connected to the second node N2 and a second electrode connected to the drive voltage line PL. The capacitor Cst can be connected to the drive voltage line PL and the gate terminal of the first transistor T1 to store and retain a voltage corresponding to the difference between the voltages at its two ends, thereby maintaining the voltage applied to the gate terminal of the first transistor T1.

[0117] An organic light-emitting diode (OLED) may include pixel electrodes and a common electrode facing the pixel electrodes, and the common electrode may receive a common voltage ELVSS. The OLED may receive a drive current from a first transistor T1 to emit light of a predetermined color, thereby displaying an image. The common electrode may be included publicly, i.e., as a single body relative to multiple pixels.

[0118] exist Figure 5B In this embodiment, although the fourth transistor T4 and the seventh transistor T7 are connected to the second scan line SL-1 and the third scan line SL+1 respectively, the present invention is not limited thereto. In another embodiment, both the fourth transistor T4 and the seventh transistor T7 can be connected to the second scan line SL-1 so as to be driven according to the second scan signal Sn-1.

[0119] Figure 6 This is a schematic diagram of an implementation method for a digitizer. Figure 7 yes Figure 6 An enlarged view of part A of the digitizer shown. Figure 8A and Figure 8B yes Figure 7 An enlarged view of part B of the loop coil shown. Figure 9A and Figure 9B yes Figure 7 An enlarged view of portion C of the loop coil shown. Figure 8A and Figure 9A It is a floor plan, and Figure 8B and Figure 9B They are along Figure 8A Lines II-II′ and III-III′ in the middle and Figure 7 The sectional view taken from line II′ in the diagram. Figure 10 It is a diagram used to describe the distance between the lines of the first loop coil.

[0120] refer to Figure 6 The digitizer DT may include a sensor substrate 500. The sensor substrate 500 may be an FPCB.

[0121] Multiple loop coils can be arranged in the display area DA of the sensor substrate 500. Some of the multiple loop coils can be arranged in the non-folded area NFA. Some other coils of the multiple loop coils can be arranged in the folded area FA. Still some other coils of the multiple loop coils may include portions arranged in the folded area FA and portions arranged in the non-folded area NFA.

[0122] The sensor substrate 500 may include a first ring group and a second ring group. The first ring group includes a plurality of first ring coils 511 that are quadrilateral (e.g., rectangular) in shape and arranged parallel to each other in a second direction D2. The second ring group includes a plurality of second ring coils 521 that are quadrilateral (e.g., rectangular) in shape and arranged parallel to each other in a first direction D1. The first ring coils 511 and the second ring coils 521 may be orthogonal to each other, and the first ring coils 511 and the second ring coils 521 may overlap each other at their intersections. The first ring coils 511 extend relatively longer in the first direction D1 than in the second direction D2, and the second ring coils 521 extend relatively longer in the second direction D2 than in the first direction D1. The ends of the first ring coils 511 and the second ring coils 521 may be connected to their respective pads of the pad unit PAD. The connection line 511c between the first ring coil 511 and the pad can extend from the first ring coil 511 to be arranged in the peripheral region PA, and the connection line 521c between the second ring coil 521 and the pad can extend from the second ring coil 521 to be arranged in the peripheral region PA. The connection lines 511c and 521c can be respectively disposed in the same layer as the first ring coil 511 and the second ring coil 521, as a single entity therewith, or they can be respectively disposed in different layers from the first ring coil 511 and the second ring coil 521, and electrically connected to the first ring coil 511 and the second ring coil 521 respectively.

[0123] The first loop coils 511 may cross (overlap) with each other. In an embodiment, one of the two crossing first loop coils 511 may be divided into portions in the crossing region, and these portions may be connected through a bridge electrode in another layer via, for example, a through-hole in the upper or lower insulating layer. Similarly, the second loop coils 521 may cross (overlap) with each other. In an embodiment, one of the two crossing second loop coils 521 may be divided into portions in the crossing region, and these portions may be connected through a bridge electrode in another layer via, for example, a through-hole in the upper or lower insulating layer.

[0124] The first ring coil 511 and the second ring coil 521 may each have a single-layer structure or a multi-layer structure including layers stacked on a third direction D3. In embodiments, the first ring coil 511 and the second ring coil 521 may include metallic materials such as copper (Cu), aluminum (Al), molybdenum (Mo), silver (Ag), etc.

[0125] In the implementation, Figure 3 The first circuit layer CL1 shown may include a first loop coil 511, and Figure 3 The second circuit layer CL2 shown may include a second loop coil 521. In another embodiment, the first circuit layer CL1 may include the second loop coil 521, and the second circuit layer CL2 may include a first loop coil 511. Figure 7 An embodiment is shown in which the first circuit layer CL1 includes a first loop coil 511 and the second circuit layer CL2 includes a second loop coil 521.

[0126] refer to Figure 7 Some of the plurality of first ring coils 511 may be arranged in the non-folded region NFA. Some other coils of the plurality of first ring coils 511 may be arranged in the folded region FA. Still some other coils of the plurality of first ring coils 511 may include portions arranged in the folded region FA and portions arranged in the non-folded region NFA. The plurality of second ring coils 521 may include portions arranged in the folded region FA and portions arranged in the non-folded region NFA.

[0127] In the following text, the portion of the first loop coil 511 arranged in the folded region FA will be referred to as the first portion 511a, and the portion of the first loop coil 511 arranged in the unfolded region NFA will be referred to as the second portion 511b. Depending on their arrangement, the first loop coil 511 may include a loop coil comprising only the first portion 511a, a loop coil comprising only the second portion 511b, or a loop coil comprising both the first portion 511a and the second portion 511b.

[0128] Similarly, the portion of the second loop coil 521 arranged in the folded region FA will be referred to as the first portion 521a, and the portion of the second loop coil 521 arranged in the unfolded region NFA will be referred to as the second portion 521b. The second loop coil 521 may include the first portion 521a and the second portion 521b.

[0129] refer to Figure 8A The width W1 of the first portion 511a of the first ring coil 511 is greater than the width W2 of the second portion 511b of the first ring coil 511. (Reference) Figure 8BThe thickness H1 of the first part 511a of the first ring coil 511 is less than the thickness H2 of the second part 511b of the first ring coil 511.

[0130] refer to Figure 9A The width W3 of the first portion 521a of the second ring coil 521 is greater than the width W4 of the second portion 521b of the second ring coil 521. (Reference) Figure 9B The thickness H3 of the first part 521a of the second ring coil 521 is less than the thickness H4 of the second part 521b of the second ring coil 521.

[0131] In an embodiment, the first portion 511a of the first ring coil 511 and the first portion 521a of the second ring coil 521 may have a thickness of about 0.2 micrometers (μm) to about 1 μm and a width of about 400 μm to about 800 μm. The second portion 511b of the first ring coil 511 and the second portion 521b of the second ring coil 521 may have a thickness of about 6 μm or greater and a width of about 200 μm to about 400 μm.

[0132] exist Figure 6 and Figure 7 In this embodiment, the distance between the parallel lines (lines facing each other) of the first loop coil 511 and the second loop coil 521 is constant. In another embodiment, as... Figure 10 As shown, the distance between facing parallel lines can vary depending on the position of the first loop coil 511. The distance between the parallel lines (facing parallel lines) of the first loop coil 511 can increase as it moves closer to the folded region FA. In an embodiment, for example, the distance DW3 between the facing lines of the first loop coil arranged in the folded region FA can be greater than the distance DW1 between the facing lines of the first loop coil arranged in the unfolded region NFA. The distance DW2 between the facing lines of the first loop coil (where one of the facing lines is arranged in the unfolded region NFA and the other in the folded region FA) can be greater than distance DW1 and less than distance DW3.

[0133] Figures 11A to 11D This is a diagram illustrating an implementation of a method for manufacturing a toroidal coil. Figures 11A to 11D This can be a method for manufacturing the first toroidal coil 511 or the second toroidal coil 521.

[0134] refer to Figure 11AA second portion LC2 of the annular coil having a second thickness and a second width can be formed in the non-folded region NFA of the substrate layer BL. In an embodiment, for example, by forming a conductive layer on the surface of the sensor substrate 500 and then removing the portion of the conductive layer in the folded region FA, a conductive pattern constituting a second portion 511b of the first annular coil 511 or a second portion 521b of the second annular coil 521 can be formed in the non-folded region NFA.

[0135] The second portion LC2 of the toroidal coil can be provided using a pressing process or an electrolytic process. In an embodiment, the second portion LC2 of the toroidal coil can be provided, for example, by the following steps: applying a slurry provided by mixing or dispersing an active material, a binder, and a conductive material in a solvent onto the FPCB, and then drying the slurry, performing a pressing process on the FPCB, forming an electrode coating on the FPCB, and removing the portion of the electrode coating corresponding to the folded region FA.

[0136] Next, refer to Figure 11B A first portion LC1 of a loop coil having a first thickness and a first width can be formed in the folded region FA of the substrate layer BL. In an embodiment, for example, a conductive pattern constituting a first portion 511a of a first loop coil 511 or a first portion 521a of a second loop coil 521 can be formed in the folded region FA of the sensor substrate 500. The first portion LC1 of the loop coil can be provided using a deposition process such as sputtering. The end portion of the first portion LC1 of the loop coil can overlap and contact the end portion of the second portion LC2 in the unfolded region NFA near the boundary between the folded region FA and the unfolded region NFA. As shown, the end portion of the first portion LC1 of the loop coil can overlap above the end portion of the second portion LC2. The first thickness can be less than the second thickness, and the first width can be greater than the second width. The metal material of the first portion LC1 of the loop coil can be the same as or different from the metal material of the second portion LC2 of the loop coil.

[0137] Next, refer to Figure 11C This can form an adhesive layer AL that covers the base layer BL of the toroidal coil.

[0138] like Figure 11D As shown, the first part LC1 of the loop coil can be a bridge electrode that connects to the part of the second part LC2 that is arranged in the non-folded region NFA and is separated from and faces each other by the folded region FA.

[0139] Figures 12A to 12D This is a diagram illustrating an implementation of a method for manufacturing a toroidal coil. Figures 12A to 12DThis can be a method for manufacturing the first toroidal coil 511 or the second toroidal coil 521.

[0140] refer to Figure 12A A first portion LC1 of the loop coil, having a first thickness and a first width, can be formed in the folded region FA of the substrate layer BL. In an embodiment, for example, a conductive pattern constituting a first portion 511a of the first loop coil 511 or a first portion 521a of the second loop coil 521 can be formed in the folded region FA of the sensor substrate 500. The first portion LC1 of the loop coil can be provided using a deposition process such as sputtering.

[0141] Next, refer to Figure 12B A second portion LC2 of the loop coil, having a second thickness and a second width, can be formed in the non-folded region NFA of the substrate layer BL. In an embodiment, for example, a conductive pattern constituting the second portion 511b of the first loop coil 511 or the second portion 521b of the second loop coil 521 can be formed in the non-folded region NFA of the sensor substrate 500. The second portion LC2 of the loop coil can be provided using a pressing process or an electrolytic process. The end portion of the second portion LC2 of the loop coil can overlap and contact the end portion of the first portion LC1 in the non-folded region NFA near the boundary between the folded region FA and the non-folded region NFA. As shown, the end portion of the first portion LC1 of the loop coil can overlap below the end portion of the second portion LC2. The metal material of the second portion LC2 of the loop coil can be the same as or different from the metal material of the first portion LC1 of the loop coil.

[0142] Next, refer to Figure 12C An adhesive layer AL can be set to cover the toroidal coil of the base layer BL.

[0143] like Figure 12D As shown, the first part LC1 of the loop coil can be a bridge electrode that connects to the part of the second part LC2 that is arranged in the non-folded region NFA and is separated from and faces each other by the folded region FA.

[0144] Figures 13A to 13D This is a diagram illustrating an implementation of a method for manufacturing a toroidal coil. Figures 13A to 13D This can be a method for manufacturing the first toroidal coil 511 or the second toroidal coil 521.

[0145] Through such Figure 13A As shown, a conductive layer CM is formed on the substrate layer BL, and as... Figure 13BThe portion of the conductive layer CM corresponding to the folded region FA, etched by a mask process (e.g., a halftone mask process), can form a first portion LC1 of the loop coil LC having a first thickness and a first width, and a second portion LC2 of the loop coil LC having a second thickness and a second width. Next, as... Figure 13C As shown, an adhesive layer AL can be provided for the toroidal coil LC that covers the base layer BL.

[0146] like Figure 13D As shown, the first part LC1 and the second part LC2 of the loop coil LC can be a conductive pattern set as a single body.

[0147] Figures 14A to 14E This is a diagram illustrating an embodiment of a toroidal coil.

[0148] As described above, in this embodiment, the toroidal coil LC can have a linear shape. The first portion LC1 and the second portion LC2 of the toroidal coil LC can also have linear shapes. The thickness of the first portion LC1 of the toroidal coil LC can be less than the thickness of its second portion LC2, and the width of the first portion LC1 can be greater than the width of the second portion LC2.

[0149] In an embodiment, the toroidal coil LC can have a winding structure provided by a zigzag shape with one or more turns to achieve higher magnetic sensitivity. The first portion LC1 and the second portion LC2 of the toroidal coil LC can have a zigzag shape. The thickness of the first portion LC1 of the toroidal coil LC can be less than the thickness of its second portion LC2, and the width of the first portion LC1 can be greater than the width of the second portion LC2.

[0150] In the implementation method, such as Figure 14A As shown, the toroidal coil LC can have a linear shape in the non-folded region NFA and a zigzag shape in the folded region FA. That is, the first portion LC1 of the toroidal coil LC can have a zigzag shape, and the second portion LC2 can have a linear shape. Furthermore, in this case, the thickness of the first portion LC1 of the toroidal coil LC can be less than the thickness of its second portion LC2, and the width of the first portion LC1 can be greater than the width of the second portion LC2. The zigzag shape of the toroidal coil LC can be modified in various ways. In an embodiment, for example, the curved portion CA of the toroidal coil LC can be as follows... Figure 14A The image shown bends at an acute angle (θ1), as... Figure 14B The diagram shows a bend at a 90-degree angle (θ2), or as shown... Figure 14C The diagram shows a curve at an obtuse angle (θ3). For example... Figure 14B and Figure 14C As shown, the corners of the curved portion CA can be rounded.

[0151] In the implementation method, such as Figure 14D As shown, multiple through-holes TH can be defined in the toroidal coil LC within the folded region FA. That is, the through-holes TH can be linearly defined in the first portion LC1 of the toroidal coil LC in its extending direction. Figure 14E As shown, the first portion LC1 of the loop coil LC may have a recessed portion CC between the through holes TH. Furthermore, in this case, the thickness of the first portion LC1 of the loop coil LC may be less than the thickness of its second portion LC2, and the width of the first portion LC1 may be greater than the width of the second portion LC2.

[0152] Figure 15 This is a schematic diagram of an implementation method for a digitizer. Figure 16 This is a schematic diagram illustrating the driving of the digitizer.

[0153] refer to Figure 15 The digitizer DT may include a first ring coil 511 arranged in the second direction D2 and a second ring coil 521 arranged in the first direction D1. The digitizer DT may also include a first selection driver 42, a second selection driver 44, and a controller 46.

[0154] The controller 46 can output control signals to control the ring coil selection operation of the first selection driver 42 and the second selection driver 44, and sequentially provide each ring coil with an AC signal of a predetermined frequency.

[0155] The first selection driver 42 can sequentially select the first toroidal coil 511Y1 to Y1. M (M is a natural number), and the second selection driver 44 can sequentially select the second toroidal coil 521X1 to X. M Thus, a magnetic field based on the AC signal is formed in each of the first ring coil 511 and the second ring coil 521.

[0156] Let's refer to each other. Figure 16 The input unit 600 may include a resonant circuit 610, and an induced magnetic field is generated in the input unit 600 by a magnetic field sent from a loop coil. The digitizer DT can detect the induced magnetic field via the loop coil, thereby detecting the position, pen pressure and height of the input unit 600.

[0157] The input unit 600 can generate electromagnetic signals and output them to the outside. Figure 15 The input unit 600 shown is an embodiment and can be any device that outputs electromagnetic signals, without limitation.

[0158] Figure 17 This is a flowchart of an implementation method for driving a digitizer. Figure 18 This is a diagram used to describe an implementation of the extended folded region. Figure 17 This could be a hovering event detection method using a digitizer.

[0159] refer to Figure 17 When a pen touch event is detected (S61), the digitizer DT can detect (or determine) the position of the input unit 600 (S62). Pen touch events can include direct touch events and indirect touch events.

[0160] The digitizer DT can determine whether the input unit 600 is located within the folded area FA (S63). In an embodiment, in the case of an indirect touch event, the digitizer DT can determine whether the input unit 600 is within the folded area FA. When the input unit 600 is within the folded area FA, for example, the input unit 600 may be within the folded area FA, or at least a portion of the input unit 600 may be within the folded area FA.

[0161] When the input unit 600 is in the non-folded region NFA, the digitizer DT can switch to a standard driving mode (S64), and in the standard driving mode, detect (or identify) the height (hereinafter referred to as "hover height") from the surface of the display device (e.g., 10 in FIG. 1) to the pen tip of the input unit 600 (S66). The standard driving mode can be a mode in which a constant AC voltage is applied to the loop coil in the non-folded region NFA of the digitizer DT.

[0162] When the input unit 600 is in the folded region FA, the digitizer DT can switch to boost drive mode (S65) and detect (or identify) the hover height in boost drive mode (S66). Boost drive mode can be a mode in which the strength of the AC voltage applied to the toroidal coil arranged in the extended folded region EA is increased, such as... Figure 18 As shown, the extended folded area EA extends from the folded area FA of the digitizer DT to a predetermined area AA on the left and right. In an embodiment, the width of area AA may correspond to the diameter of the tip of the pen tip of the input unit 600. In an embodiment, the width of the folded area FA in the second direction D2 may be approximately 8 millimeters (mm), the width of area AA may be 1 mm, and the width of the extended folded area EA may be approximately 10 mm.

[0163] In one embodiment, when the input unit 600 is within the extended folded region EA, for example, the digitizer DT can increase the AC voltage applied to at least one toroidal coil arranged in the boost region BA to a preset value. The boost region BA is a region within the extended folded region EA that extends a predetermined range from the position 600P of the input unit 600.

[0164] The position and height of the input unit 600 can be detected using changes in the magnetic field detected between the input unit 600 and the loop coil. In an embodiment, the digitizer DT can detect changes in the magnetic field between the input unit 600 and the loop coil directly below the input unit 600, as well as the loop coil surrounding the input unit 600, and determine the hover position and height based on interpolation of the detected values. When a hovering event occurs, the position and height of the input unit 600 can be accurately detected by signal enhancement in the folded region FA.

[0165] The digitizer DT can correct the height of the input unit 600 detected in boost drive mode according to a preset algorithm.

[0166] In embodiments of the present invention, a foldable display device may be provided that includes a digitizer capable of detecting the precise position of the input unit. However, these objectives are merely examples, and the scope of the invention is not limited thereto.

[0167] It should be understood that the embodiments described herein should be considered merely descriptive and not for limiting purposes. Descriptions of features or advantages within each embodiment should generally be considered applicable to other similar features or advantages in other embodiments. While one or more embodiments have been described with reference to the accompanying drawings, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope defined by the appended claims.

Claims

1. A display device comprising a folding region and a non-folding region, the display device comprising: The display panel includes multiple pixels; as well as The digitizer is located on one side of the display panel and includes multiple loop coils. When a hovering event of the input unit is detected in the folded region, the digitizer increases the intensity of the AC voltage applied to at least one of the plurality of loop coils arranged in the folded region, and calculates the hovering height of the input unit based on the change in the magnetic field between the input unit and the loop coils among the plurality of loop coils. The loop coils among the plurality of loop coils include a loop coil overlapping the input unit and adjacent loop coils surrounding the input unit. The plurality of ring coils have a first width and a first thickness in the folded region and a second width and a second thickness in the unfolded region, wherein the second width is less than the first width and the second thickness is greater than the first thickness.

2. The display device according to claim 1, wherein, Each of the plurality of loop coils has a linear shape.

3. The display device according to claim 1, wherein, Each of the plurality of ring coils has a Z-shaped form.

4. The display device according to claim 1, wherein, Each of the plurality of ring coils has a linear shape in the non-folded region and a Z-shaped shape in the folded region.

5. The display device according to claim 1, wherein, At least one of the plurality of ring coils arranged in the folded region defines a plurality of through holes.

6. The display device according to claim 1, wherein, The plurality of ring coils include a first portion corresponding to the folded region and a second portion corresponding to the non-folded region, and the end portion of the first portion contacts the end portion of the second portion.

7. The display device according to claim 6, wherein, The end portions of the first portion of the plurality of ring coils overlap the end portions of the second portion.

8. The display device according to claim 6, wherein, The end portions of the first portion of the plurality of ring coils overlap below the end portions of the second portion.

9. The display device according to claim 1, wherein, The plurality of ring coils include a first portion corresponding to the folded region and a second portion corresponding to the non-folded region, and the first portion and the second portion are configured as a single body.

10. The display device according to claim 1, wherein, When the hover event of the input unit is detected in the folded area, the digitizer extends the folded area.

11. The display device according to claim 10, wherein, The digitizer increases the AC voltage applied to at least one of the multiple toroidal coils arranged in the extended folded region.

12. The display device according to claim 10, wherein, The digitizer increases the AC voltage applied to at least one of the plurality of loop coils, the at least one loop coil being arranged within a region extending a predetermined range from the location of the input unit within the extended folded region.

13. A display device comprising a folding region and a non-folding region, the display device comprising: A digitizer includes a plurality of loop coils, wherein the plurality of loop coils have a first width and a first thickness in the folded region and a second width and a second thickness in the unfolded region, wherein the second width is smaller than the first width and the second thickness is greater than the first thickness. When a hovering event of the input unit is detected in the folded region, the digitizer increases the intensity of the AC voltage applied to at least one of the plurality of loop coils arranged in the folded region.

14. The display device according to claim 13, wherein, Each of the plurality of loop coils has a linear shape.

15. The display device according to claim 13, wherein, Each of the plurality of ring coils has a Z-shaped form.

16. The display device according to claim 13, wherein, Each of the plurality of ring coils has a linear shape in the non-folded region and a Z-shaped shape in the folded region.

17. The display device according to claim 13, wherein, At least one of the plurality of ring coils arranged in the folded region defines a plurality of through holes.

18. The display device according to claim 13, wherein, When the hover event of the input unit is detected in the folded area, the digitizer extends the folded area, and The digitizer increases the AC voltage applied to at least one of the multiple toroidal coils arranged in the extended folded region.

19. The display device according to claim 18, wherein, The digitizer increases the AC voltage applied to at least one of the plurality of loop coils, the at least one loop coil being arranged within a region extending a predetermined range from the location of the input unit within the extended folded region.

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