Display device

Abstract

A display device according to an embodiment includes: a conductive plate; a lower protective film positioned on the conductive plate; a display panel positioned on the lower protective film; a cover window positioned on the display panel; and a voltage applying section applying a compensation voltage to the conductive plate, in which the compensation voltage has the same polarity as a charge accumulated in a case where an external object rubs an outer surface of the cover window.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0085939 filed in the Korean Intellectual Property Office (KIPO) on July 3, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to a display device. Background Art

[0004] A display device such as a liquid crystal display (LCD) and an organic light emitting diode display (OLED display) includes a display panel including one or more pixels and one or more signal lines capable of displaying an image, and includes a cover window to protect the display panel.

[0005] Each pixel includes a pixel electrode to which a data signal is applied, and the pixel electrode is connected to at least one transistor to receive the data signal.

[0006] The display panel may include a display area capable of displaying an image and a peripheral area around the display area.

[0007] The cover window covers the display panel.

[0008] Light of an image displayed on the display panel may pass through the cover window in the display area and be recognized by the user's eyes. Summary of the invention

[0009] A cover window of a display device is charged by an object in contact with the cover window, and characteristics of transistors of a display panel may be changed due to the induced charges.

[0010] Embodiments are directed to solving these problems by reducing the influence on transistors of a display panel caused by charges applied to a cover window of a display device, thereby reducing display defects.

[0011] The technical objectives achieved by the present disclosure are not limited to those described herein, and other technical objectives not mentioned herein will be clearly understood by those skilled in the art from the description of the present disclosure.

[0012] A display device according to an embodiment includes: a conductive plate; a lower protective film positioned on the conductive plate; a display panel positioned on the lower protective film; a cover window positioned on the display panel; and a voltage applying portion that applies a compensation voltage to the conductive plate, wherein the compensation voltage has the same polarity as charges accumulated when an external object rubs against an outer surface of the cover window.

[0013] The display device may further include: a driving part applying a voltage to the display panel; and a conductive adhesive layer positioned between the driving part and the conductive plate and electrically connecting the driving part to the conductive plate. The voltage applying part may be located in the driving part.

[0014] The display device may further include: a wiring formed in the driving part and electrically connecting the voltage applying part and the conductive adhesive layer.

[0015] The display panel may include a display area, a driving part area, and a bending area positioned between the display area and the driving part area, and the display panel may be bent in the bending area so that the driving part area overlaps with a rear surface of the display panel, and the driving part may be installed in the driving part area and electrically connected to the driving part area.

[0016] The driving part may include a flexible printed circuit film, a printed circuit board, or at least one driving circuit chip.

[0017] The polarity of the time average value of the compensation voltage may be the same as the polarity of the charges accumulated on the outer surface of the cover window.

[0018] An absolute value of a time average value of the compensation voltage may be greater than or equal to an absolute value of a potential of charges accumulated on an outer surface of the cover window.

[0019] The compensation voltage may be constant.

[0020] The compensation voltage can swing between two voltages.

[0021] The display device may further include an adhesive layer disposed at least one of between the conductive plate and the lower protective film, between the lower protective film and the display panel, and between the display panel and the cover window.

[0022] The display device may further include a polarizer positioned between the display panel and the cover window.

[0023] The display device may further include: an ink layer positioned on an inner edge or an outer edge of the display panel, and the ink layer may be non-conductive or have a resistance of about 1 ohm or more.

[0024] The display panel may further include: a sensing region overlapping the at least one optical element, wherein the display panel has an inner edge defining the sensing region, and the ink layer includes a first ink layer formed along the inner edge.

[0025] The display panel may have three outer edges, and the ink layer may include a second ink layer formed along at least a portion of the three outer edges.

[0026] The display device may further include: a first plate positioned between the conductive plate and the lower protective film, wherein the conductive plate has an opening exposing the first plate; and a conductive adhesive layer positioned in the opening and electrically connected to the first plate.

[0027] The display device may further include: a second plate positioned outside the conductive plate.

[0028] A display device according to an embodiment includes: a conductive plate; a lower protective film on the conductive plate; a display panel on the lower protective film; a cover window on the display panel and the conductive plate; and a voltage applying part that applies a compensation voltage to the conductive plate, and an average value of the compensation voltage is about -1V or less.

[0029] The compensation voltage can be constant or swing between two voltages.

[0030] The display device may further include: a driving part applying a voltage to the display panel; and a conductive adhesive layer positioned between the driving part and the conductive plate and electrically connecting the driving part to the conductive plate. The voltage applying part may be located in the driving part.

[0031] The display panel may include a display area, a driving part area, and a bending area positioned between the display area and the driving part area, the display panel may be bent in the bending area so that the driving part area overlaps with a rear surface of the display panel, and the driving part may be installed in the driving part area and electrically connected to the driving part area.

[0032] According to an embodiment, display defects may be reduced by reducing the influence of charges charged in a cover window of a display device on transistors of a display panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic plan view of a front surface of a display device according to an embodiment.

[0034] Figure 2 is a schematic plan view of a rear surface of a display device according to an embodiment.

[0035] Figure 3 yes Figure 2 0 is a schematic cross-sectional view of the display device shown in taken along line A1 - B1 .

[0036] Figure 4 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 is taken along line A2 - B2 .

[0037] Figure 5 is a schematic diagram of a potential obtained by measuring a surface potential of a cover window after an external object contacts the cover window of a display device according to an embodiment.

[0038] Figure 6 A schematic cross-sectional view of a display device according to an embodiment and an intensity of an electric field applied to a transistor are shown.

[0039] Figure 7 shows a schematic cross-sectional view of a display device according to a comparative example and the intensity of an electric field applied to a transistor;

[0040] Figure 8 is a schematic diagram illustrating changes in characteristics of a transistor due to an increase in potential due to charges induced in a display panel of a display device according to a comparative example.

[0041] Fig. 9 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 is taken along line A3 - B3 .

[0042] Fig.10 is a schematic plan view of a rear surface of a display device according to an embodiment.

[0043] Fig.11 yes Fig.10 0 is a schematic cross-sectional view of the display device shown in taken along line A1 - B1 .

[0044] Fig.12 yes Fig.10 A schematic cross-sectional view of the display device shown in FIG. 1 is taken along line A2 - B2 .

[0045] Fig.13 yes Figure 2 0 is a schematic cross-sectional view of the display device shown in taken along line A1 - B1 .

[0046] Fig.14 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 is taken along line A3 - B3 .

[0047] Fig.15 yes Figure 2 0 is a schematic cross-sectional view of the display device shown in taken along line A1 - B1 .

[0048] Fig.16 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 is taken along line A3 - B3 . DETAILED DESCRIPTION

[0049] Hereinafter, various embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those skilled in the art can implement the present disclosure.

[0050] The present disclosure may be embodied in many different forms and is not limited to the embodiments set forth herein.

[0051] In order to more clearly describe the present disclosure, parts irrelevant to the description may be omitted, and the same reference numerals may be assigned to the same or similar components throughout the specification.

[0052] Since the size and thickness of each component shown in the drawings may be arbitrarily shown for convenience of explanation, the present disclosure is not necessarily limited to the sizes and thicknesses of those components shown.

[0053] In the drawings, the thickness may be exaggerated to clearly show various layers and regions. In other words, the thickness of some layers and regions is exaggerated for ease of explanation.

[0054] When a part such as a layer, film, region, or plate is referred to as being "on" or "over" another part, this includes not only the case where it is "directly on" the other part, but also the case where the other part is in between. Conversely, when a part is referred to as being "directly on" another part, this means that there is no other part in between. Furthermore, "on" or "over" a reference part means being located above or below the reference part, and does not necessarily mean being located "over" or "over" it in the opposite direction of gravity.

[0055] Furthermore, throughout the specification, when a component is referred to as “including,” “comprising,” or “having,” it means that it may also include, comprise, or have other components without excluding other components, unless otherwise specified.

[0056] Throughout the specification, when a “plan image” or “plan view” is mentioned, this means when the target portion is observed from above, and when a “cross-sectional image” or “cross-sectional view” is mentioned, this means when a cross section of a vertically cut target portion is observed from the side.

[0057] When an element is referred to as being "on," "connected to," or "coupled to" another element, it may be directly on, directly connected to, or directly coupled to another element, or there may be intervening elements or layers. However, when an element is referred to as being "directly on," "directly connected to," or "directly coupled to" another element, there are no intervening elements or layers. For this purpose, the term "connected" may refer to a physical connection, an electrical connection, and / or a fluid connection with or without intervening elements.

[0058] In view of the measurements in question and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system), the terms "about" or "approximately" as used herein are inclusive of the stated value and mean within an acceptable range of deviation for the particular value as determined by one of ordinary skill in the art. For example, "about" can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0059] The term "and / or" includes all combinations of one or more that the relevant configurations can define. For example, "A and / or B" can be understood to mean "A, B, or A and B".

[0060] Unless otherwise defined or implied herein, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. It will also be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and should not be interpreted in an idealized or overly formal sense unless explicitly so defined herein.

[0061] Will refer to Figures 1 to 5 A display device according to an embodiment is described.

[0062] Figure 1 is a schematic plan view of the front side of a display device according to an embodiment, Figure 2 is a schematic plan view of the rear side of a display device according to an embodiment, and Figure 3 yes Figure 2 Schematic cross-sectional view of the display device shown in FIG. 1 along line A1 - B1 . Figure 4 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 taken along line A2 - B2 .

[0063] Reference Figure 1 According to an embodiment, the display device 1000 includes a display panel 300, and the display panel 300 includes a display area DA, which is a region capable of displaying an image, and a non-display area DA, which is a region other than the display area DA.

[0064] The display area DA may display an image. For example, the display area DA may display an image on a plane parallel to the first direction DR1 and the second direction DR2. However, the embodiment is not limited thereto. In another embodiment, for example, within the scope and spirit of the present disclosure, the plane may be defined in various ways.

[0065] The display area DA may include pixels PX as units for displaying an image and one or more signal lines.

[0066] The pixel PX may include at least one transistor formed on a substrate and a pixel electrode connected to the at least one transistor.

[0067] For example, in the case where the pixel PX includes at least one light emitting device, each pixel PX may include at least one transistor connected to the light emitting device.

[0068] In order to realize color display, each pixel PX may display one of specific colors, and an image of a desired color may be recognized as the sum of images displayed by these specific colors.

[0069] The signal lines include a scan line 121 for transmitting a scan signal and one or more data lines 171 for transmitting a data signal.

[0070] In an embodiment, each scan line 121 may extend mainly in the first direction DR1 in the display area DA, and the data line 171 may extend mainly in the second direction DR2 in the display area DA and may be connected to the pad PD located in the non-display area. However, the embodiment is not limited thereto. For example, the scan line 121 and the data line 171 may extend in a direction different from the above, and / or the pad PD may be located in the display area and / or the non-display area.

[0071] The non-display area may include a peripheral area PA and a driving portion area CA located around the display area DA.

[0072] The peripheral area PA may be an area adjacent to the display area DA and surrounding the display area DA.

[0073] At least one signal line 173 may be located in the peripheral area PA.

[0074] The signal line 173 may extend along the edge of the display area DA and extend to the driving portion area CA.

[0075] The display panel 300 according to the embodiment may further include a bending area BA.

[0076] The bending area BA may be positioned between the driving portion area CA and the display area DA, and may extend across the display panel 300 , for example, in the first direction DR1 .

[0077] The display panel 300 is bent in the bending area BA such that the driving section area CA positioned outside the bending area BA is folded toward the back of the display panel 300 and overlaps the rear surface of the display panel 300. The driving section area CA may overlap a portion of the display area DA.

[0078] Figure 1shows a state where the display panel 300 is unfolded without being bent in the bending area BA, and Figure 2 A state in which the bending area BA is bent so that the driving part area CA is located on the rear surface of the display panel 300 , that is, overlapped with the rear surface of the display panel 300 is shown.

[0079] According to the structure of the display device 1000 , the bending area BA may be omitted.

[0080] Reference Figure 1 , the driving part area CA may be located below the lower side of the display area DA and outside the bending area BA.

[0081] The driving portion area CA may include one or more pads PD.

[0082] Reference Figure 2 , at least one driving part 700 may be mounted in the driving part area CA and may be electrically connected to the pad PD.

[0083] The driving part 700 may apply various driving signals, driving voltages, etc. to the display area DA and the peripheral area PA of the display device 1000 .

[0084] The driving part 700 may be in the form of a flexible printed circuit film, a printed circuit board, or at least one driving circuit chip.

[0085] Figure 2 An example is shown in which the driving portion 700 is a flexible printed circuit film or a printed circuit board.

[0086] The data line 171 may be connected to the driving part 700 to receive a data signal.

[0087] The display panel 300 may further include one or more touch sensors in the display area DA.

[0088] A touch sensor may include one or more sensing electrodes.

[0089] Reference Figure 1 , Figure 2 and Figure 4 , the display area DA of the display device 1000 according to the embodiment may include the sensing area SA.

[0090] In addition, the display device 1000 according to the embodiment may further include at least one optical element 950 overlapping the sensing area SA in, for example, the third direction DR3.

[0091] The sensing area SA may be an area where light is incident to or emitted from the optical element 950 .

[0092] Optical element 950 may include a camera, a flash, a sensor, and the like.

[0093] For example, the optical element 950 may emit light within a wavelength range (eg, a specific or selectable wavelength range) toward an object located on the display device 1000 , or receive light reflected from the object.

[0094] Light of a wavelength (e.g., a specific or selectable wavelength) may be light of a wavelength other than the visible light region as light of an image displayed in the display area DA and may be processed in the optical element 950; it may also be light of a visible light region similar to light of an image displayed in the display area DA.

[0095] The sensing area SA may have higher light transmittance than the surrounding display area DA and the peripheral area PA.

[0096] Light emitted from or incident to the optical element 950 may pass through the sensing area SA of the display device 1000 .

[0097] like Figure 1 As shown in , the sensing area SA may be located adjacent to the top of the display area DA or in an area around the top of the display area DA, but the location of the sensing area SA is not limited thereto. For example, the sensing area SA may be located in a selected area of ​​the display area DA.

[0098] Reference Figure 3 , the display panel 300 may include an outer edge 300e forming a contour, and referring to Figure 4 , the display panel 300 may include an inner edge 300ee defining an outer edge of the sensing area SA.

[0099] The optical element 950 may be disposed in the sensing area SA surrounded by the inner edge 300 ee of the display panel 300 .

[0100] Will refer to Figure 3 and Figure 4 Together with Figure 1 and Figure 2 A cross-sectional structure of a display device according to an embodiment will be described.

[0101] Reference Figure 3 and Figure 4 , the display device according to the embodiment may include, for example, the cover window 100 , the polarizer 200 , the display panel 300 , and / or the lower protective film 400 overlapped in the third direction DR3 , and may include a lower plate 500 .

[0102] As described above, the display panel 300 may include one or more pixels and one or more transistors, and may be a display panel of various display devices such as a liquid crystal display device and an organic light emitting display device.

[0103] The display panel 300 may display an image toward the cover window 100 .

[0104] exist Figure 3 and Figure 4 In the embodiment shown in , the direction in which the image is displayed may be the same as the third direction DR3.

[0105] The cover window 100 may form an outer surface of a surface of the display device 1000 displaying an image, and may come into contact with an external object.

[0106] According to an embodiment, at least one upper protective film may be further positioned outside the cover window 100 .

[0107] The upper protective film may include a polymer resin.

[0108] The cover window 100 may transmit an image provided by the display area DA of the display panel 300 , and may include a light blocking member 110 overlapping at least a portion of the peripheral area PA.

[0109] The light blocking member 110 may be formed on a rear surface of the cover window 100 facing the display panel 300 .

[0110] The cover window 100 may include an insulating material such as glass, sapphire, or polymer resin.

[0111] The polarizer 200 may be positioned between the display panel 300 and the cover window 100 .

[0112] The polarizer 200 may be used to reduce external light reflection.

[0113] In an embodiment, the polarizer 200 may be in the form of a polarizing film. However, the embodiment is not limited thereto. For example, the polarizer 200 may be in various forms within the scope of the spirit of the present disclosure.

[0114] The polarizer 200 may include at least one polarization layer and / or at least one retardation layer.

[0115] The polarizing layer may include polyvinyl alcohol (PVA) and may further include at least one support.

[0116] For example, the polarizer 200 may be a circular polarization film.

[0117] An adhesive layer 51 may be positioned between the cover window 100 and the polarizer 200 .

[0118] An adhesive layer 52 may be positioned between the polarizer 200 and the display panel 300 .

[0119] The lower plate 500 positioned on the opposite side of the cover window 100 with respect to the display panel 300 may be conductive, and may include, for example, various metals or metal alloys.

[0120] The lower protective film 400 may be positioned between the display panel 300 and the lower plate 500 .

[0121] The lower protective film 400 may include, for example, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), polyethylene naphthalate (PEN), polystyrene (PS), polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polyether sulfone (PES), polypropylene (PP) and polyamide (PA), and may include at least one of the polymer resins.

[0122] The adhesive layer 53 may be positioned between the display panel 300 and the lower protective film 400 .

[0123] The adhesive layer 54 may be positioned between the lower protective film 400 and the lower plate 500 .

[0124] At least one of the adhesive layers 51 , 52 , 53 , and 54 may include a polymerized organic material, and may be a thermosetting type or a UV curing type.

[0125] For example, the adhesive layers 51 , 52 , 53 , and 54 may include a polymer resin such as an acrylic material, a silicon material, rubber, polyurethane, vinyl acetate, epoxy resin, or styrene-butadiene-styrene (SBS).

[0126] In particular, the adhesive layers 51 and 52 positioned between the display panel 300 and the cover window 100 may be optically transparent adhesive layers such as optically clear adhesive (OCA), optically clear resin (OCR), or pressure sensitive adhesive (PSA).

[0127] Reference Figures 2 to 4 , the cover window 100 may cover the layers therebelow (eg, the polarizer 200, the display panel 300, the lower protective film 400, and the lower plate 500), and it may cover the layers by having a larger area than the layers in a plane.

[0128] The light blocking member 110 of the cover window 100 may overlap edges of the polarizer 200 , the display panel 300 , the lower protective film 400 , and / or the lower plate 500 .

[0129] Reference Figure 3 and Figure 4, in the case where an external object 900 such as a stylus pen touches or rubs the outer surface of the cover window 100 , the cover window 100 may be charged with static electricity.

[0130] Figure 5 : is a graph of the electric potential measured on the surface of the cover window of the display device according to the embodiment after contact with an external object; this is a graph of the results of measuring the surface potential of the cover window after the outer surface of the cover window was roughly rubbed with an external object about 675 times over a period of about 12 hours.

[0131] Reference Figure 5 , after a test in which an external object such as a stylus is rubbed on the outer surface of the cover window for several hours (e.g., 12 hours), it can be confirmed that the surface potential of the outside of the cover window is widely distributed from about -0.2 V to about -1.0 V, and mainly falls narrowly in the range of about -0.4 V to about -0.7 V.

[0132] For example, negative charges forming a potential in a range of about -1V to about 0V are accumulated on the outer surface of the cover window due to contact with an external object.

[0133] Reference Figure 3 and Figure 4 , in the case where negative static charges accumulate on the outer surface of the cover window 100 , positive charges may be induced on the inner surface opposite to the outer surface of the cover window 100 or the light blocking member 110 and on the substrate side of the display panel 300 .

[0134] Then, an electric field E1 may be formed from the substrate side of the display panel 300 toward the cover window 100 , which may affect characteristics of transistors of the display panel 300 .

[0135] The polarity of the triboelectric charges accumulated on the outer surface of the cover window 100 is not limited to negative charges and may vary according to the material of the cover window 100 and the material of the external object 900 .

[0136] A constant or varying compensation voltage may be applied to the lower panel 500 of the display device 1000 according to the embodiment.

[0137] To this end, the display device 1000 according to the embodiment may include a voltage applying part 750 for applying a compensation voltage to the lower panel 500 .

[0138] like Figure 2 As shown in , the voltage applying part 750 may be located in the driving part 700 .

[0139] An absolute value of a time average value of the compensation voltage may be greater than or equal to an absolute value of a potential of charges accumulated on the outer surface of the cover window 100 .

[0140] The polarity of the time average value of the compensation voltage may be substantially the same as the polarity of the charges accumulated on the outer surface of the cover window 100 .

[0141] In the case where a constant compensation voltage is applied to the lower panel 500 , a voltage having the same polarity as the charges accumulated on the outer surface of the cover window 100 may be applied.

[0142] An absolute value of the compensation voltage applied to the lower panel 500 by the voltage applying part 750 may be equal to or greater than an absolute value of a voltage caused by charges accumulated on the outer surface of the cover window 100 .

[0143] For example, as described above, since the maximum value of the absolute value of the voltage caused by the charges accumulated on the outer surface of the cover window 100 can be approximately 1V, the absolute value of the compensation voltage applied to the lower panel 500 by the voltage applying part 750 can be greater than or equal to 1V, and in the case where the charges accumulated on the outer surface of the cover window 100 are negative, the compensation voltage can be, for example, a voltage between about -1V and about -5V.

[0144] In the case where a varying compensation voltage is applied to the lower panel 500 , the compensation voltage may be a voltage that swings between two voltages.

[0145] The polarity of the average of the maximum value and the minimum value of the swing voltage may be substantially the same as the polarity of the charges accumulated on the outer surface of the cover window 100 .

[0146] An absolute value of an average value of the maximum value and the minimum value of the swing voltage may be equal to or greater than an absolute value of a potential due to charges accumulated on the outer surface of the cover window 100 .

[0147] For example, as described above, in the case where the minimum value of the voltage caused by the charges accumulated on the outer surface of the cover window 100 is about -1V, the average value of the maximum and minimum values ​​of the swing compensation voltage applied to the lower panel 500 by the voltage applying part 750 can be equal to or less than about -1V.

[0148] For a more specific example, the compensation voltage applied to the lower plate 500 by the voltage applying part 750 may swing between about -1V and about -5V or between about -2V and about 0V.

[0149] Even in this case, the absolute value of the average value of the swing compensation voltage applied to the lower panel 500 by the voltage applying part 750 may be equal to or greater than the absolute value of the potential due to charges accumulated on the outer surface of the cover window 100 .

[0150] According to the implementation mode, Figure 3 and Figure 4As shown in , by the compensation voltage applied to the lower panel 500 , an opposite electric field E2 may be formed from the substrate side of the display panel 300 toward the lower panel 500 .

[0151] For example, by the negative charges applied to the lower plate 500 , the amount of positive charges induced on the substrate side of the display panel 300 is reduced, thereby reducing the influence on the characteristics of the transistors of the display panel 300 .

[0152] like Figure 3 and Figure 4 As shown in , the electric field E1 caused by the charges induced by the negative charges accumulated on the outer surface of the cover window 100 on the substrate of the display panel 300 can be applied to the lower panel 500, and since the electric field effect on the transistor of the display panel 300 is reduced by offsetting or reducing the opposite electric field E2 formed by the compensation voltage, the change in the characteristics of the transistor can be reduced.

[0153] This will refer to Figures 6 to 8 Detailed description.

[0154] Figure 6 shows a schematic cross-sectional view of a display device according to an embodiment and the strength of an electric field affecting a transistor, Figure 7 shows a schematic cross-sectional view of a display device according to a comparative example and the strength of an electric field affecting a transistor, and Figure 8 is a schematic diagram illustrating a change in characteristics of a transistor due to an increase in potential caused by charges induced on a display panel of a display device according to a comparative example.

[0155] Reference Figure 6 , the display panel 300 of the display device according to the embodiment may include a substrate 302 .

[0156] The substrate 302 may include an insulating material such as glass or polyimide.

[0157] Buffer layer 304, semiconductor layer 306, first insulating layer 308, first conductive layer 310, second insulating layer 312 may be formed in third direction DR3 on substrate 302. Second conductive layer 314, third insulating layer 316, third conductive layers 318 and 320, fourth insulating layer 322, and light emitting device 324 may be positioned sequentially.

[0158] In an implementation, the buffer layer 304, the first insulating layer 308, the second insulating layer 312, and / or the third insulating layer 316 may include, for example, an organic insulating material and / or an insulating material such as silicon oxide (SiO x ), silicon nitride (SiN x ), silicon oxynitride (SiO x N y ) of inorganic insulating materials.

[0159] The semiconductor layer 306 may include an oxide semiconductor, amorphous silicon, polycrystalline silicon, or the like.

[0160] In an implementation, a portion of the semiconductor layer 306 may include impurities to form a conductive region, and a portion of the semiconductor layer 306 may form a channel region.

[0161] Figure 6 An example is shown in which the semiconductor layer 306 includes a channel region 306 c and conductive regions 306 a and 306 b positioned on both sides of the channel region 306 c .

[0162] The first conductive layer 310 may include a gate electrode overlapping the channel region 306 c of the semiconductor layer 306 .

[0163] The gate electrode of the first conductive layer 310 and the semiconductor layer 306 may together form a transistor.

[0164] The second conductive layer 314 may overlap at least a portion of the first conductive layer 310 to form a capacitor.

[0165] A voltage different from that of the gate electrode may be applied to the second conductive layer 314 .

[0166] The third conductive layers 318 and 320 may include a connection electrode 318 electrically connected to the conductive region 306 a of the semiconductor layer 306 and a connection electrode 320 electrically connected to the conductive region 306 b of the semiconductor layer 306 .

[0167] The first conductive layer 310, the second conductive layer 314, and the third conductive layers 318 and 320 may include, for example, at least one metal or metal alloy including aluminum (Al), platinum (Pt), palladium (Pd), silver (Ag), magnesium (Mg), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), calcium (Ca), molybdenum (Mo), titanium (Ti), tungsten (W), or copper (Cu), and / or may be composed of a single layer or multiple layers.

[0168] The fourth insulating layer 322 may include an inorganic insulating material or an organic insulating material such as a polymer derivative, an acrylic polymer, an imide polymer, a polyimide, a polyamide, an acrylic polymer, or a siloxane polymer.

[0169] The light emitting device 324 may be formed on the fourth insulating layer 322 , or a separately formed light emitting device may be mounted on the fourth insulating layer 322 .

[0170] The light emitting device 324 may include two electrodes and a light emitting layer positioned between the two electrodes.

[0171] The light emitting device 324 may emit light toward the cover window 100 .

[0172] Although not in Figure 6 , but at least one insulating layer may be further positioned on the light emitting device 324.

[0173] Reference Figure 6 As described above, when negative static charge accumulates on the outer surface of the cover window 100, positive charge can be induced on the inner surface of the cover window 100 opposite to the outer surface and on the side of the substrate 302 of the display panel 300 facing the transistor, particularly on the top side.

[0174] However, according to an embodiment, in the case where a compensation voltage is applied to the lower plate 500 and charges of the same polarity as the charges accumulated on the outer surface of the cover window 100 are introduced, the charges may be sequentially introduced to the layers between the substrate 302 and the lower plate 500. In this case, the positive charges induced on the top surface of the substrate 302 of the display panel 300 may be offset and disappear, or only partially remain.

[0175] As a result, the electric field Ef1 that ultimately affects the transistors of the display panel 300 may be reduced, so that changes in characteristics of the transistors caused by the electric field may be reduced.

[0176] Figure 6 A state in which the electric field Ef1 may be very small because only a portion of the positive charges on the upper surface of the substrate 302 of the display panel 300 remains is shown.

[0177] On the other hand, for comparison, refer to Figure 7 , the display device according to the comparative example and Figure 6 The display device shown in FIG. 1 may be different at least in that a compensation voltage having the same polarity as the charges accumulated on the outer surface of the cover window 100 is not applied to the lower panel 500 .

[0178] According to this, the positive charges induced on the upper surface of the substrate 302 of the display panel 300 remain as they are, and the change in the characteristics of the transistor increases while the electric field Ef2 that ultimately affects the transistor of the display panel 300 increases.

[0179] Figure 7 The strength of the electric field Ef2 shown in Figure 6 The strength of the electric field Ef1 shown in .

[0180] like Figure 8As shown in the figure, the current (Ids) and voltage (Vgs) curves (IV curves) of the gate and source of the transistor tend to shift to the left (i.e., in the direction of the horizontal arrow) as the intensity of the induced charge or electric field (Ef1, Ef2) on the top surface of the substrate (302) of the display panel increases.

[0181] According to an embodiment, since the intensity of the electric field may be weakened, the IV curve of the transistor may not be shifted, or the degree of shift may be reduced, so that the change in the characteristics of the transistor is reduced.

[0182] In the case where the shift of the IV curve of the transistor increases, the current (Ids) of the transistor may increase, causing the display screen at the edge of the sensing area to become brighter and possibly be recognized as color spots.

[0183] However, according to an embodiment, since the degree of shift of the IV curve of the transistor of the display panel may be reduced, the occurrence of display defects such as light spots caused by brightening of the display screen at the edge of the sensing area may be prevented.

[0184] Will refer to Fig. 9 As well as the above described Figure 2 A structure of a display device according to an embodiment will be described.

[0185] Fig. 9 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 is taken along line A3 - B3 .

[0186] Reference Fig. 9 as well as Figure 2 , the driving part 700 may be electrically connected to the lower board 500 through the conductive adhesive layer 600 , and the voltage applying part 750 located in the driving part 700 may be electrically connected to the conductive adhesive layer 600 through the wiring 760 .

[0187] The wiring 760 may be formed in the driving portion 700 .

[0188] According to an embodiment, the conductive adhesive layer 600 may include an adhesive material such as a conductive PSA, may be in the form of a conductive film, or may include conductive balls.

[0189] Will refer to Figures 10 to 12 The display device according to the embodiment is described with reference to the drawings described previously.

[0190] Fig.10 is a schematic plan view of a rear surface of a display device according to an embodiment, Fig.11 yes Fig.10 A schematic cross-sectional view of the display device shown in FIG. 1 taken along line A1 - B1 , and Fig.12 yes Fig.10 A schematic cross-sectional view of the display device shown in FIG. 1 taken along line A2 - B2 .

[0191] The display device 1000 a according to the embodiment may be different from the display device 1000 described above at least in that the display device 1000 a may further include ink layers 800 and 802 positioned at the inner edge or the outer edge of the display panel 300 .

[0192] The ink layer 800 located on the outer edge of the display panel 300 may be formed along at least some of the outer edges of three surfaces of the display panel 300 except for one side where the driving portion area CA is located.

[0193] Fig.10 An example is shown in which the ink layer 800 includes a first ink layer 800 a , a second ink layer 800 b , and a third ink layer 800 c formed along different outer edges of the display panel 300 .

[0194] The first ink layer 800a may be formed along the outer edge of the display panel 300 facing the driving part area CA, and the second ink layer 800b may be formed along the outer edge of the left side of the display panel 300. The third ink layer 800c may be formed along the outer edge of the right side of the display panel 300 to face the second ink layer 800b.

[0195] However, the embodiment is not limited thereto, and at least a portion of the first ink layer 800 a , the second ink layer 800 b , and the third ink layer 800 c may be omitted.

[0196] In addition, the adjacent first ink layer 800a, the second ink layer 800b and the third ink layer 800c may be as follows: Fig.10 , they may be continuously formed by being connected to each other, or they may be separated without being connected to each other.

[0197] Reference Fig.11 The ink layer 800 may cover and contact not only the outer edge 300 e of the display panel 300 , but also the side surfaces of the edges of the lower plate 500 , the lower protective film 400 , the polarizer 200 , and the adhesive layers 51 , 52 , 53 , and 54 .

[0198] The ink layer 800 may include an edge positioned on the rear surface of the cover window 100 and spaced apart from the side surface of the cover window 100 .

[0199] For example, the ink layer 802 located at the inner edge of the display panel 300 may be formed along the edge of the sensing area SA.

[0200] Reference Fig.12The ink layer 802 may cover and contact the inner edge 300 ee of the sensing area SA of the display panel 300 and the side surfaces of the inner edges of the lower plate 500 , the lower protective film 400 , the polarizer 200 , and the adhesive layers 51 , 52 , 53 , and 54 .

[0201] The ink layer 802 may be spaced apart from the optical element 950 in a plan view.

[0202] The ink layer 802 may include an edge positioned on the rear surface of the cover window 100 and spaced apart from the side surface of the cover window 100 .

[0203] Ink layers 800 and 802 may be conductive or insulating non-conductors, and may include colorants or pigments.

[0204] If the ink layers 800 and 802 may be conductive, the resistance may be greater than about 1 ohm.

[0205] Ink layers 800 and 802 may include, for example, a conductive material such as silver nanowires.

[0206] Will refer to Fig.13 and Fig.14 The display device according to the embodiment is described with reference to the drawings described previously.

[0207] Fig.13 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 taken along line A1 - B1 , and Fig.14 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 is taken along line A3 - B3 .

[0208] Reference Fig.13 and Fig.14 The display device according to the embodiment may be different from the display device 1000 described above at least in that the display device may further include a first plate 502 positioned between the lower plate 500 and the lower protective film 400 and an adhesive layer 56 between the first plate 502 and the lower plate 500 .

[0209] The first plate 502 may be electrically conductive, and may include, for example, various metals or metal alloys.

[0210] The driving part 700 may be electrically connected to the first board 502 through the conductive adhesive layer 600 , and the voltage applying part 750 located in the driving part 700 may be connected to the conductive adhesive layer 600 and electrically connected.

[0211] In order to electrically connect the driving part 700 and the first board 502 , the lower board 500 and the adhesive layer 56 may have an opening 500 a exposing the first board 502 .

[0212] The conductive adhesive layer 600 may be located in the opening 500 a .

[0213] The compensation voltage described above may be applied to the first plate 502 instead of the lower plate 500 to mitigate the intensity of the electric field affecting the transistors of the display panel 300 .

[0214] According to the implementation mode, according to Fig.13 and Fig.14 The display device of the embodiment shown in FIG. 3 may further include ink layers 800 and 802 located on the inner edge or the outer edge of the display panel 300 as described above.

[0215] Will refer to Fig.15 and Fig.16 The display device according to the embodiment is described with reference to the drawings described previously.

[0216] Fig.15 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 taken along line A1 - B1 , and Fig.16 yes Figure 2 A schematic cross-sectional view of the display device shown in FIG. 1 is taken along line A3 - B3 .

[0217] Reference Fig.15 and Fig.16 The display device according to the embodiment may be different from the display device 1000 described above at least in that it may further include a second plate 504 positioned outside the lower plate 500 , and may further include an adhesive layer 58 between the second plate 504 and the lower plate 500 .

[0218] The second plate 504 may be electrically conductive, and may include, for example, various metals or metal alloys.

[0219] The driving part 700 may be electrically connected to the second board 504 through the conductive adhesive layer 600 , and the voltage applying part 750 located in the driving part 700 may be connected to the conductive adhesive layer 600 and electrically connected.

[0220] The compensation voltage described above may be applied to the second plate 504 instead of the lower plate 500 to mitigate the strength of the electric field affecting the transistors of the display panel 300 .

[0221] According to the implementation mode, according to Fig.15 and Fig.16 The display device of the embodiment shown in FIG. 3 may further include ink layers 800 and 802 positioned on the inner edge or the outer edge of the display panel 300 as described above.

[0222] The above description is an example of the technical features of the present disclosure, and a person skilled in the art to which the present disclosure belongs will be able to make various modifications and changes.Therefore, the embodiments of the present disclosure described above can be implemented separately or in combination with each other.

[0223] The embodiments disclosed in this disclosure are not intended to limit the technical spirit of the disclosure, but are intended to describe the technical spirit of the disclosure, and the scope of the technical spirit of the disclosure is not limited by these embodiments. The protection scope of the disclosure should be interpreted by the attached claims, and it should be understood that all technical spirits within the equivalent scope are included in the scope of the disclosure.

Claims

1. A display device, comprising: Conductive plate; A lower protective film positioned on the conductive plate; a display panel positioned on the lower protective film; a cover window, located on the display panel; as well as a voltage applying part, applying a compensation voltage to the conductive plate, The compensation voltage has the same polarity as charges accumulated when an external object rubs against an outer surface of the cover window.

2. The display device according to claim 1, further comprising: A driving part, applying a voltage to the display panel; as well as a conductive adhesive layer positioned between the driving portion and the conductive plate and electrically connecting the driving portion to the conductive plate, Wherein, the voltage applying part is located in the driving part.

3. The display device according to claim 2, further comprising: A wiring is formed in the driving section and electrically connects the voltage applying section and the conductive adhesive layer.

4. The display device according to claim 2, wherein: The display panel includes a display area, a driving part area, and a bending area positioned between the display area and the driving part area. the display panel is bent in the bending region so that the driving part region overlaps with a rear surface of the display panel, and The driving part is mounted in the driving part area and is electrically connected to the driving part area.

5. The display device according to claim 4, wherein: The driving part includes a flexible printed circuit film, a printed circuit board or at least one driving circuit chip.

6. The display device according to claim 1, wherein: The polarity of the time average value of the compensation voltage is the same as the polarity of the charges accumulated on the outer surface of the cover window.

7. The display device according to claim 6, wherein: An absolute value of the time average value of the compensation voltage is greater than or equal to an absolute value of a potential of charges accumulated on the outer surface of the cover window.

8. The display device according to claim 6, wherein: The compensation voltage is constant.

9. The display device according to claim 6, wherein: The compensation voltage swings between two voltages.

10. The display device according to claim 1, further comprising: An adhesive layer is disposed at least one of between the conductive plate and the lower protective film, between the lower protective film and the display panel, and between the display panel and the cover window.

11. The display device according to claim 1, further comprising: A polarizer is positioned between the display panel and the cover window.

12. The display device according to claim 1, further comprising: an ink layer positioned on an inner edge or an outer edge of the display panel, and The ink layer is non-conductive or has a resistance of 1 ohm or more.

13. The display device according to claim 12, further comprising: a sensing region overlapping at least one optical element, wherein the display panel has an inner edge defining the sensing area, and The ink layer includes a first ink layer formed along the inner edge.

14. The display device according to claim 12, wherein: The display panel has three outer edges, and The ink layer includes a second ink layer formed along at least a portion of the three outer edges.

15. The display device according to claim 1, further comprising: a first plate positioned between the conductive plate and the lower protective film, wherein the conductive plate has an opening exposing the first plate, and A conductive adhesive layer is located in the opening and is electrically connected to the first board.

16. The display device according to claim 1, further comprising: A second plate is positioned outside the conductive plate.

17. A display device, comprising: Conductive plate; A lower protective film positioned on the conductive plate; a display panel positioned on the lower protective film; a cover window, located on the display panel; as well as a voltage applying part, applying a compensation voltage to the conductive plate, Wherein, the average value of the compensation voltage is -1V or lower.

18. The display device according to claim 17, wherein: The compensation voltage is either constant or swings between two voltages.

19. The display device according to claim 17, further comprising: A driving part, applying a voltage to the display panel; as well as a conductive adhesive layer positioned between the driving portion and the conductive plate and electrically connecting the driving portion to the conductive plate, Wherein, the voltage applying part is located in the driving part.

20. The display device according to claim 19, wherein: The display panel includes a display area, a driving part area, and a bending area positioned between the display area and the driving part area. the display panel is bent in the bending region so that the driving part region overlaps with a rear surface of the display panel, and The driving part is mounted in the driving part area and is electrically connected to the driving part area.

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