Display device

Abstract

The display device includes an anti-glare layer. The anti-glare layer includes a base film, a first coating layer disposed over the base film and including a plurality of textured structures, a plurality of beads disposed inside the textured structures, and a second coating layer disposed over the first coating layer. The anti-glare layer prevents or reduces flicker.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to a display device. Background Art

[0002] In response to the development of the information society, the demand for various display devices for displaying images is increasing day by day. Recently, various display devices such as liquid crystal display devices and organic light emitting display devices have been widely used.

[0003] The descriptions provided in this related art section should not be assumed to be prior art merely because they are mentioned in or associated with the description of the related art section. The description of the related art section may include information that describes one or more aspects of the subject technology. Summary of the Invention

[0004] The display device may include an antiglare layer. The antiglare layer may scatter incident external light.

[0005] The inventors of the present disclosure newly recognized that: flickering may occur on the antiglare layer, and the flickering may reduce the display quality of the display panel.

[0006] Therefore, the inventors of the present disclosure recognized the above-mentioned problems and other limitations associated with the related art, and conducted various tests to implement a display device with improved display quality.

[0007] One aspect of the present disclosure is to provide a display device capable of reducing image distortion.

[0008] Another aspect of the present disclosure is to provide a display device capable of preventing or reducing flickering.

[0009] Another aspect of the present disclosure is to provide a display device capable of equalizing the height of the texture structure.

[0010] Another aspect of the present disclosure is to provide a high-quality display device having improved image quality due to preventing or reducing flickering.

[0011] To achieve these and other aspects of the inventive concept, as implemented and broadly described herein, a display device includes: a display panel on which a plurality of sub-pixels are arranged; and an antiglare layer disposed above the display panel, wherein the antiglare layer includes: a base film; a first coating disposed above the base film and including a plurality of texture structures; a plurality of beads disposed inside the texture structures; and a second coating disposed above the first coating.

[0012] The first refractive index of the first coating, the second refractive index of the beads, and the third refractive index of the second coating may be the same. Each of the first refractive index, the second refractive index, and the third refractive index may be between 1.49 and 1.65.

[0013] The height distribution of the texture structure may be 3 or less. The maximum height of the texture structure may be greater than or equal to 2.0 micrometers.

[0014] The diameter of the beads may be between 0.8 micrometers and 3.5 micrometers.

[0015] According to an embodiment, the display device may reduce image distortion.

[0016] According to an embodiment, the display device may prevent or reduce flicker.

[0017] According to an embodiment, the display device may equalize the height of the texture structure.

[0018] According to an embodiment, the display device may be provided as a high-quality display device having improved image quality by preventing or reducing flicker.

[0019] For those skilled in the art, additional systems, devices, methods, features, and advantages will be or will become apparent upon review of the following drawings and detailed description. All such additional systems, devices, methods, features, and advantages are intended to be included within this specification, within the scope of the present disclosure, and protected by the appended claims. Nothing in this section shall be construed as limiting the appended claims. Other aspects and advantages are discussed below in connection with embodiments of the present disclosure.

[0020] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the claimed inventive concept. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings may be included to provide a further understanding of the present disclosure and may be incorporated and constitute a part of the present disclosure. The drawings illustrate embodiments of the present disclosure and, together with the description, are used to explain the various principles of the present disclosure.

[0022] The above and other aspects, features, and advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings, in which:

[0023] Figure 1 Illustrates a system configuration of a display device according to an embodiment;

[0024] Figure 2 Illustrates a display panel according to an embodiment;

[0025] Figure 3Schematically illustrates a display device according to an embodiment;

[0026] Figure 4 Illustrates an anti-glare film according to an embodiment;

[0027] Figure 5 And Figure 6 Illustrates a flicker according to an embodiment;

[0028] Figure 7 Illustrates an anti-glare layer according to an embodiment;

[0029] Figure 8 Is a graph illustrating the height of a texture structure according to an embodiment;

[0030] Figure 9 Illustrates experimental data regarding the height of a texture structure according to an example;

[0031] Figure 10 、 Figure 11 And Figure 12 Illustrates experimental data regarding the height of beads and a texture structure according to an example;

[0032] Figure 13 Illustrates a table of the refractive index of an anti-glare layer according to an example; and

[0033] Figure 14 And Figure 15 Illustrates an anti-glare layer according to an example.

[0034] Throughout the drawings and the detailed description, unless otherwise described, the same reference numerals should be understood to refer to the same elements, features, and structures. The relative dimensions and depictions of these elements may be exaggerated for clarity, illustration, and convenience. Detailed Description

[0035] In the following description of examples or embodiments of the present disclosure, reference will be made to the accompanying drawings, in which specific examples or embodiments that can be implemented are shown by way of example, and in which the same reference numerals and symbols may be used to represent the same or similar components, even if they are shown in different drawings from each other. Further, in the following description of examples or embodiments of the present disclosure, when it is determined that a detailed description of well-known functions and components incorporated herein may obscure the subject matter in some embodiments of the present disclosure, that description will be omitted. Terms such as "including", "comprising", "having", "containing", "constituting", "consisting of", and "formed of" used herein are generally intended to allow the addition of other components, unless these terms are used together with the term "only". As used herein, the singular forms are intended to include the plural forms unless the context clearly indicates otherwise. The progress of the described processing steps and / or operations is an example; however, the order of the steps and / or operations is not limited to the order set forth herein and may be changed as is known in the art, except for steps and / or operations that must occur in a specific order. The names of the corresponding elements used in the following description may be selected only for the convenience of writing the specification and may thus be different from the names used in actual products.

[0036] Advantages and features of the present disclosure and methods for realizing the same will become clear through the following example embodiments described in detail with reference to the accompanying drawings. However, the present disclosure may be implemented in different forms and should not be construed as limited to the example embodiments set forth herein. On the contrary, these example embodiments are provided so that the present disclosure may be sufficiently thorough and complete to assist those skilled in the art in fully understanding the scope of the present disclosure.

[0037] The shapes, sizes, ratios, angles, quantities, etc. illustrated in the drawings depicting various example embodiments of the present disclosure are given only by way of example. Accordingly, the present disclosure is not limited to the illustrations in the drawings. Any implementation described herein as an "example" need not be construed as being preferred or advantageous over other implementations.

[0038] When describing positional relationships, for example, when using terms such as "above", "over", "below", "above", "beneath", "under", "adjacent", "close to" or "next to", "beside", "alongside" to describe the positional relationship between two components, one or more other components may be disposed between the two components, unless more restrictive terms such as "immediately", "directly" or "closely" are used. For example, when a structure is described as being "above", "over", "under", "above", "beneath", "below" another structure, "adjacent" to another structure, "close to" another structure or "next to" another structure, "beside" another structure, "alongside" another structure, this description should be interpreted to include cases where the structures are in contact with each other and cases where a third structure is disposed or interposed therebetween. In addition, terms such as "left", "right", "top", "bottom", "downward", "upward", "above", "below", etc. refer to any reference system.

[0039] This document may use terms such as "first", "second", "A", "B", "(A)" or "(B)" to describe the elements of the present disclosure. Each of these terms is not used to define the nature, order, sequence or quantity, etc. of the element, but only to distinguish the corresponding element from other elements.

[0040] When it is mentioned that a first element is "connected or coupled", "contacted or overlapped" with a second element, etc., it should be understood that the first element can not only be "directly connected or coupled" or "directly contacted or overlapped" with the second element, but also a third element can be "interposed" between the first element and the second element, or the first element and the second element can be "connected or coupled", "contacted or overlapped", etc. with each other through a fourth element. Here, the second element may be included in at least one of two or more elements that are "connected or coupled", "contacted or overlapped", etc. with each other.

[0041] When using time - relative terms such as "after", "subsequently", "next", "before", etc. to describe the process or operation of an element or configuration, or the flow or steps in an operation, process, manufacturing method, these terms can be used to describe a non - continuous or non - sequential process or operation, unless used together with the terms "directly" or "immediately".

[0042] In addition, when referring to any dimension, relative dimension, etc., the numerical value or corresponding information (e.g., level, range, etc.) of the element or feature should be considered to include the tolerance or error range that may be caused by various factors (e.g., process factors, internal or external influences, noise, etc.), even if no relevant description is specified. In addition, the term "may" fully encompasses all the meanings of the term "can".

[0043] Features in various embodiments of the present disclosure can be coupled or combined with each other partially or wholly, and can interoperate with each other in various ways technically and be driven technically as can be fully understood by those skilled in the art. Embodiments of the present disclosure can be implemented independently of each other, or can be implemented together in a mutually dependent relationship.

[0044] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the exemplary embodiments belong. It will also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein. For example, terms such as "component" or "unit" can be applied, for example, to a separate circuit or structure, an integrated circuit, a computational block of a circuit device, or any structure configured to perform the described functions, as should be understood by one of ordinary skill in the art.

[0045] Hereinafter, various embodiments of the display device will be described in detail with reference to the drawings. In addition, all components of each display device according to all embodiments of the present disclosure are operatively coupled and configured.

[0046] Figure 1 The system configuration of the display device 100 according to an embodiment is illustrated.

[0047] Referring to Figure 1 , the display device 100 according to an embodiment may include a display panel 110 and a display driving circuit as components for displaying an image. The display driving circuit is a circuit for driving the display panel 110, and may include a data driver circuit 120, a gate driver circuit 130, a display controller 140, etc.

[0048] The display panel 110 may include a substrate 111 and a plurality of sub-pixels SP disposed on the substrate 111.

[0049] The substrate 111 of the display panel 110 may include a display area DA on which an image (or video) can be displayed and a non-display area NDA located outside the display area DA. For example, the non-display area NDA may be adjacent to the display area DA or may be provided to surround the display area DA.

[0050] The sub-pixels SP for displaying an image may be disposed in the display area DA, and the non-display area NDA may include a pad area located in a first direction from the display area DA.

[0051] In the display panel 110 according to an embodiment, the non-display area NDA may have a relatively small size. As used herein, the non-display area NDA is also referred to as a "bezel".

[0052] For example, the non-display area NDA may include a first non-display area located outside the display area DA in a first direction, a second non-display area located outside the display area DA in a second direction intersecting the first direction, a third non-display area located outside the display area DA in a direction opposite to the first direction, and a fourth non-display area located outside the display area DA in a direction opposite to the second direction. One or both of the first non-display area to the fourth non-display area may include a pad area to which the data driver circuit 120 is connected or bonded. Two or three of the first non-display area to the fourth non-display area that do not include the pad area may have a relatively small size.

[0053] In another example, the boundary area between the display area DA and the non-display area NDA may be curved such that the non-display area NDA is located below the display area. In this case, when a user views the display device 100 from the front, the user may see very little or no non-display area NDA.

[0054] On the substrate 111 of the display panel 110, various types of signal lines for driving the sub-pixels SP may be provided.

[0055] The display device 100 according to an embodiment may be a liquid crystal display device (LCD), or may be a self-emitting display device in which the display panel 110 emits light by itself. When the display device 100 according to an embodiment is a self-emitting display device, each sub-pixel SP may include a light-emitting element.

[0056] For example, the display device 100 according to an embodiment may be an organic light-emitting display device in which the light-emitting element is implemented as an organic light-emitting diode (OLED). In another example, the display device 100 according to an embodiment may be an inorganic light-emitting display device in which the light-emitting element is implemented as an inorganic light-emitting diode (LED). Specifically, the display device 100 may be a micro-LED display device having a small light-emitting area to achieve high quality and high resolution. In another example, the display device 100 according to an embodiment may be a quantum dot display device in which the light-emitting element is implemented as a quantum dot (e.g., a self-emitting semiconductor crystal).

[0057] The structure of each sub-pixel SP may vary depending on the type of the display device 100. For example, when the display device 100 is a self-emitting display device in which the sub-pixel SP emits light by itself, each sub-pixel SP may include a self-emitting light-emitting element, one or more transistors, and one or more capacitors.

[0058] For example, various types of signal lines may include multiple data lines DL for transmitting data signals (also referred to as data voltages or image (or video) signals), multiple gate lines GL for transmitting gate signals (also referred to as scan signals), and the like.

[0059] For example, the data lines DL and the gate lines GL may cross each other. The corresponding data lines DL may be arranged to extend in a first direction, and the corresponding gate lines GL may be arranged to extend in a second direction. Here, the first direction may be the column direction, and the second direction may be the row direction. In another example, the first direction may be the row direction, and the second direction may be the column direction. In the following description, for the sake of simplicity, an example is described in which the corresponding data lines DL are arranged in the column direction and the corresponding gate lines GL are arranged in the row direction.

[0060] The data driver circuit 120 is a circuit for driving the data lines DL and may output data signals to the data lines DL.

[0061] The data driver circuit 120 may receive image data DATA in digital format from the display controller 140, convert the received image data DATA into an analog data signal, and output the converted analog data signal to the corresponding data lines DL.

[0062] For example, the data driver circuit 120 may be connected to the display panel 110 by a tape automated bonding (TAB) method, connected to bonding pads on the display panel 110 by a chip on glass (COG) or chip on panel (COP) method, or implemented using a chip on film (COF) method to be connected to the display panel 110.

[0063] The data driver circuit 120 may be connected to one side (e.g., the upper or lower side) of the display panel 110. In another example, depending on the design, driving method, etc. of the display panel, the data driver circuit 120 may be connected to both sides (e.g., the upper and lower sides) of the display panel 110 or connected to two or more sides of the four sides of the display panel 110.

[0064] The data driver circuit 120 may be connected to the periphery of the display area DA of the display panel 110, but in another example, the data driver circuit 120 may also be provided in the display area DA of the display panel 110.

[0065] The gate driver circuit 130 is a circuit for driving the gate lines GL and may output gate signals to the gate lines GL.

[0066] The gate driver circuit 130 may be provided with a first gate voltage corresponding to a conduction level voltage, a second gate voltage corresponding to a cut-off level voltage, and various gate driving control signals GCS to generate a gate signal, and may provide the generated gate signal to the gate line GL.

[0067] In the display device 100 according to an embodiment, the gate driver circuit 130 may be installed inside the display panel 110 by an in-panel gate (GIP) method. When the gate driver circuit 130 is an in-panel gate circuit, the gate driver circuit 130 may be disposed above the substrate 111 of the display panel 110 during the manufacturing process of the display panel 110.

[0068] In the display device 100 according to an embodiment, the gate driver circuit 130 may be disposed in the display area DA of the display panel 110. For example, the gate driver circuit 130 may be disposed in the first part of the display area DA (e.g., the left part or the right part of the display area DA). In another example, the gate driver circuit 130 may be disposed in the first part of the display area DA (e.g., the left part or the right part within the display area DA) and the second part of the display area DA (e.g., the right part or the left part within the display area DA).

[0069] In the present disclosure, the gate driver circuit 130 installed inside the display panel 110 by the GIP method is referred to as a "GIP circuit".

[0070] The display controller 140 is a device for controlling the data driver circuit 120 and the gate driver circuit 130, and may control the driving timing of the data line DL and the driving timing of the gate line GL.

[0071] The display controller 140 may provide a data driving control signal DCS to the data driver circuit 120 to control the data driver circuit 120, and provide a gate driving control signal GCS to the gate driver circuit 130 to control the gate driver circuit 130.

[0072] The display controller 140 may receive input image data from the host system 150, and may provide image data DATA to the data driver circuit 120 based on the input image data.

[0073] The display controller 140 may be implemented as a component separate from the data driver circuit 120, or may be integrated with the data driver circuit 120 to form an integrated circuit.

[0074] The display controller 140 may be a timing controller used in conventional display technologies, may be a control device that may include a timing controller to further perform other control functions, may be a control device other than a timing controller, or may be a circuit within a control device. The display controller 140 may be implemented as various circuits or electronic components such as an integrated circuit (IC), a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), or a processor.

[0075] The display controller 140 may be mounted on a printed circuit board (PCB), a flexible printed circuit (FPC), etc., and may be electrically connected to the data driver circuit 120 and the gate driver circuit 130 through the PCB, FPC, etc.

[0076] The display controller 140 may send signals to and receive signals from the data driver circuit 120 according to one or more predetermined interfaces. For example, the interface may include a low voltage differential signal (LVDS) interface, an embedded clock point-to-point interface (EPI) interface, a serial peripheral interface (SPI), etc.

[0077] In order to provide a touch sensing function in addition to the image display function, the display device 100 according to an embodiment may include a touch sensor and a touch sensing circuit for detecting whether a touch is caused by a touch object such as a finger or a pen (e.g., a stylus) or for determining a touch position by sensing the touch sensor.

[0078] The touch sensing circuit may include a touch driver circuit and a touch controller. The touch driver circuit drives and senses the touch sensor to generate and output touch sensing data, and the touch controller uses the touch sensing data to determine the touch position or detect the occurrence of a touch.

[0079] The touch sensor may include a plurality of touch electrodes. The touch sensor may also include a plurality of touch lines for electrically connecting the plurality of touch electrodes to the touch driver circuit.

[0080] The touch sensor may exist in the form of a touch panel outside the display panel 110 or inside the display panel 110. When the touch sensor is in the form of a touch panel outside the display panel 110, the touch sensor is referred to as an external touch sensor. When the touch sensor is an external touch sensor, the touch panel and the display panel 110 may be manufactured separately and assembled together during assembly. Such an external touch panel may include a substrate for the touch panel and a plurality of touch electrodes on the substrate for the touch panel.

[0081] When a touch sensor is present inside the display panel 110, the touch sensor can be disposed on a substrate together with signal lines and electrodes associated with display driving during the manufacturing process of the display panel 110.

[0082] The touch driver circuit can provide a touch driving signal to at least one touch electrode and can sense at least one touch electrode to generate touch sensing data.

[0083] The touch sensing circuit can perform touch sensing in a self-capacitance sensing mode or a mutual-capacitance sensing mode.

[0084] When the touch circuit performs touch sensing in the self-capacitance sensing mode, the touch circuit can perform touch sensing based on the capacitance between each touch electrode and a touch object (e.g., a finger or a pen (e.g., a stylus)). According to self-capacitance sensing, each touch electrode can serve as both a driving touch electrode and a sensing touch electrode. The touch driver circuit can drive all or part of the touch electrodes and sense all or part of the touch electrodes.

[0085] When the touch circuit performs touch sensing in the mutual-capacitance sensing mode, the touch circuit can perform touch sensing based on the capacitance between touch electrodes. According to mutual-capacitance sensing, the touch electrodes are divided into driving touch electrodes and sensing touch electrodes. The touch driver circuit can drive the driving touch electrodes and sense the sensing touch electrodes.

[0086] The touch driver circuit and the touch controller of the touch sensing circuit can be implemented as separate devices or as a single device. In addition, the touch driver circuit and the data driver circuit can be implemented as separate devices or as a single device.

[0087] The display device 100 may further include a power circuit for supplying various powers to the display driving circuit and / or the touch sensing circuit and the like.

[0088] The display device 100 according to an embodiment may be, but is not limited to, a mobile device such as a smart phone or a tablet, or various sizes of monitors, televisions (TVs), etc., and may be any display of various types and various sizes capable of displaying information or images (or videos).

[0089] The display device 100 according to an embodiment may further include electronic devices such as a camera (or an image sensor) and a detection sensor. For example, the detection sensor may be a sensor that receives light such as infrared light, ultrasonic waves, or ultraviolet light to detect an object or a human body.

[0090] Figure 2 The display panel 110 according to an embodiment is illustrated.

[0091] Refer toFigure 2 The display panel 110 may include a substrate 111 on which a plurality of sub-pixels SP are disposed and a encapsulation layer 200 above the substrate 111. Here, the encapsulation layer 200 may also be referred to as an encapsulation substrate, an encapsulation portion, etc.

[0092] Referring Figure 2 When the display device 100 according to an embodiment is a self-emitting light-emitting display, each sub-pixel SP disposed on the substrate 111 may include a light-emitting element ED and a sub-pixel circuit SPC for driving the light-emitting element ED.

[0093] Referring Figure 2 The sub-pixel circuit SPC may include a plurality of pixel driving transistors and at least one capacitor for driving the light-emitting element ED. In the present disclosure, the sub-pixel circuit SPC may drive the light-emitting element ED by providing a driving current to the light-emitting element ED at a predetermined timing. The light-emitting element ED may be driven by the driving current to emit light.

[0094] The pixel driving transistors may include a driving transistor DT for driving the light-emitting element ED and a scanning transistor ST that is turned on or off in response to a scanning signal SC.

[0095] The driving transistor DT may provide a driving current to the light-emitting element ED.

[0096] The scanning transistor ST may be configured to control the electrical state of a corresponding node in the sub-pixel circuit SPC or control the state or operation of the driving transistor DT.

[0097] The at least one capacitor may include a storage capacitor Cst for maintaining a constant voltage during one frame period.

[0098] To drive the sub-pixel SP, a data signal VDATA, an image signal, a scanning signal SC, a gate signal, etc. may be applied to the sub-pixel SP. In addition, to drive the sub-pixel SP, a common pixel driving voltage including a first common driving voltage VDD and a second common driving voltage VSS may be applied to the sub-pixel SP.

[0099] The light-emitting element ED may include an anode AND, a light-emitting element intermediate layer EL, and a cathode CAT. The light-emitting element intermediate layer EL may be disposed between the anode AND and the cathode CAT.

[0100] When the light-emitting element ED is an organic light-emitting element, the light-emitting element intermediate layer EL may include a light-emitting layer EML, a first common intermediate layer COM1 between the anode AND and the light-emitting layer EML, and a second common intermediate layer COM2 between the light-emitting layer EML and the cathode. The light-emitting layer EML may be disposed in each sub-pixel SP. In contrast, the first common intermediate layer COM1 and the second common intermediate layer COM2 may be commonly disposed across two or more of the plurality of sub-pixels SP. The light-emitting layer EML may be disposed in each light-emitting region, and the first common intermediate layer COM1 and the second common intermediate layer COM2 may be commonly disposed across a plurality of light-emitting regions and a plurality of non-light-emitting regions. The first common intermediate layer COM1 and the second common intermediate layer COM2 are collectively referred to as the common intermediate layer EL_COM.

[0101] For example, the first common intermediate layer COM1 may include a hole injection layer HIL, a hole transport layer HTL, etc. The second common intermediate layer COM2 may include an electron transport layer ETL, an electron injection layer EIL, etc. The hole injection layer may inject holes from the anode AND into the hole transport layer, the hole transport layer may transport the holes to the light-emitting layer EML, the electron injection layer may inject electrons from the cathode CAT into the electron transport layer, and the electron transport layer may transport the electrons to the light-emitting layer EML.

[0102] For example, the cathode CAT may be electrically connected to the second common driving voltage line VSSL. The second common driving voltage VSS, which is a common pixel driving voltage, may be applied to the cathode CAT through the second common driving voltage line VSSL. The anode AND may be electrically connected to the first node N1 of the driving transistor DT of each sub-pixel SP. In the present disclosure, the second common driving voltage VSS may also be referred to as the base voltage VSS, and the second common driving voltage line VSSL may also be referred to as the base voltage line VSSL.

[0103] For example, the anode AND may be a pixel electrode disposed in each sub-pixel SP, and the cathode CAT may be a common electrode disposed in each sub-pixel SP. In another example, the cathode CAT may be a pixel electrode disposed in each sub-pixel SP, and the anode AND may be a common electrode commonly disposed in each sub-pixel SP. In the following description, for the sake of simplicity, only the case where the anode AND is a pixel electrode and the cathode CAT is a common electrode is considered.

[0104] Each light-emitting element ED may be a portion where the anode AND, the light-emitting element interlayer EL, and the cathode CAT overlap. Each light-emitting element ED may form a light-emitting region. For example, the light-emitting region of each light-emitting element ED may include a region where the anode AND, the light-emitting element interlayer EL, and the cathode CAT overlap.

[0105] For example, the light-emitting element ED can be an organic light-emitting diode (OLED), an inorganic light-emitting diode (LED), a quantum dot light-emitting element, etc. For example, when the light-emitting element ED is an OLED, the light-emitting element intermediate layer EL in the light-emitting element ED can include an organic light-emitting element intermediate layer EL.

[0106] The driving transistor DT can be a driving transistor for supplying a driving current to the light-emitting element ED. The driving transistor DT can be connected to the first common driving voltage line VDDL and connected to the light-emitting element ED.

[0107] The driving transistor DT can include: a first node N1, which is electrically connected to the light-emitting element ED; a second node N2, to which a data signal VDATA can be applied; and a third node N3, to which a first common driving voltage VDD from the first common driving voltage line VDDL is applied.

[0108] In the driving transistor DT, the second node N2 can be a gate node, the first node N1 can be a source node or a drain node, and the third node N3 can be a drain node or a source node. In the following description, for the sake of simplicity, an example is considered in which in the driving transistor DT, the second node N2 can be a gate node, the first node N1 can be a source node, and the third node N3 can be a drain node.

[0109] Figure 2 The scan transistor ST included in the shown sub-pixel circuit SPC can be a switching transistor for transmitting a data signal VDATA, which is an image signal, to the second node N2, which is the gate node of the driving transistor DT.

[0110] The scan transistor ST can be controlled to be turned on / off by a scan signal SC (which is a strobe signal) applied through a scan line SCL (which is a kind of strobe line GL) to control the electrical connection between the second node N2 of the driving transistor DT and the data line DL. The drain electrode or the source electrode of the scan transistor ST can be electrically connected to the data line DL, the source electrode or the drain electrode of the scan transistor ST can be electrically connected to the second node N2 of the driving transistor DT, and the gate of the scan transistor ST can be electrically connected to the scan line SCL.

[0111] The storage capacitor Cst can be electrically connected to the first node N1 and the second node N2 of the driving transistor DT. The storage capacitor Cst can include a first capacitor electrode electrically connected to the first node N1 of the driving transistor DT or corresponding to the first node N1 of the driving transistor DT, and a second capacitor electrode electrically connected to the second node N2 of the driving transistor DT or corresponding to the second node N2 of the driving transistor DT.

[0112] The storage capacitor Cst can be an external capacitor intentionally designed outside the driving transistor DT, rather than a parasitic capacitor (e.g., Cgs or Cgd) of an internal capacitor existing between the first node N1 and the second node N2 of the driving transistor DT.

[0113] Each of the driving transistor DT and the scanning transistor ST can be an n-type transistor or a p-type transistor.

[0114] The display panel 110 can have a top-emitting structure or a bottom-emitting structure, but the present disclosure is not limited thereto. The display panel 110 can also have a double-sided emitting structure.

[0115] When the display panel 110 has a top-emitting structure, at least a part of the sub-pixel circuit SPC can overlap at least a part of the light-emitting element ED in the vertical direction. On the contrary, when the display panel 110 has a bottom-emitting structure, the sub-pixel circuit SPC can not overlap the light-emitting element ED in the vertical direction.

[0116] The sub-pixel circuit SPC can have a 2T1C structure including two (2) transistors DT and ST and one (1) capacitor Cst, as Figure 2 shown, and in some cases, can include one or more transistors and / or one or more capacitors.

[0117] For example, the sub-pixel circuit SPC can have an 8T1C structure including eight (8) transistors and one (1) capacitor. In another example, the sub-pixel circuit SPC can have a 6T2C structure including six (6) transistors and two (2) capacitors. In another example, the sub-pixel circuit SPC can have a 7T1C structure including seven (7) transistors and one (1) capacitor.

[0118] The type and number of gate lines for supplying a gate signal to the sub-pixel SP can vary according to the structure of the sub-pixel circuit SPC.

[0119] In addition, the type and number of common pixel driving voltages supplied to the sub-pixel SP can vary according to the structure of the sub-pixel circuit SPC.

[0120] Since circuit elements (specifically, the light-emitting element ED implemented as an OLED in each sub-pixel SP including an organic material) are vulnerable to external moisture or oxygen, the encapsulation layer 200 can be provided on the display panel 110 to prevent or reduce the penetration of external moisture or oxygen into the circuit elements (specifically, the light-emitting element ED). The encapsulation layer 200 can be configured in various forms to prevent or reduce the contact of the light-emitting element ED with moisture or oxygen.

[0121] Figure 3Schematically illustrates a display device 100 according to an embodiment. Figure 4 Illustrates an anti-glare film 340 according to an embodiment.

[0122] Referring Figure 3 , the display device 100 may include a substrate (SUB) 310, an image display layer (PANEL) 320, a polarizer (POL) 330, and an anti-glare film (AG) 340.

[0123] The image display layer 320 may be disposed above the substrate 310. The image display layer 320 may include a plurality of sub-pixels.

[0124] The polarizer 330 may be disposed above the image display layer 320. The polarizer 330 may filter external light so that it does not reflect back to the user. However, the present disclosure is not limited thereto, and the polarizer 330 may be omitted when necessary.

[0125] The anti-glare film 340 may be disposed above the polarizer 330. The anti-glare film 340 may scatter external light. Therefore, the anti-glare film 340 may prevent or reduce external light from reflecting back to the user.

[0126] The anti-glare film 340 may include a base film 341, a coating 342, and a plurality of beads 343.

[0127] The base film 341 may be disposed on the lowermost part of the anti-glare film 340. The base film 341 may be a plastic film. The base film 341 may be transparent.

[0128] For example, the base film 341 may include one selected from triacetyl cellulose (TAC), polyester (TPEE), polyethylene terephthalate (PET), polyimide (PI), polyamide (PA), aramid, polyethylene (PE), polyacrylate (PAR), polysulfone, polyethersulfone, polypropylene (PP), diacetyl cellulose, polyvinyl chloride, acrylic resin (PMMA), polycarbonate (PC), epoxy resin, urea-formaldehyde resin, polyurethane resin, melamine resin, etc.

[0129] The coating 342 may be disposed above the base film 341. The coating 342 may include a light stabilizer, a UV absorber, an antistatic agent, a flame retardant, an antioxidant, etc.

[0130] The beads 343 may be included inside the coating 342. Since the beads 343 may be included inside the coating 342, the coating 342 may be in the form of a layer having protrusions. The protrusions may be in the shape of a fine or micro-texture structure or a concavo-convex structure.

[0131] The coating 342 may include beads 343, and thus may include a flat portion without beads and a protruding portion with beads therein.

[0132] External light incident on the beads may be scattered. Thus, the external light incident on the display device 100 may not reach the user. For example, the antiglare film 340 may prevent or reduce the degradation of visibility due to external light.

[0133] Figure 5 and Figure 6 Flickering according to an embodiment is illustrated.

[0134] Referring Figure 5 , an image display layer 320, a polarizer 330, and an antiglare film 340 are shown.

[0135] The image display layer 320 may emit image light in the upward direction. The image light may pass through the color filter.

[0136] After passing through the image display layer 320, the image light may pass through the polarizer 330 and reach the antiglare film 340.

[0137] When reaching the antiglare film 340, the direction of the image light may be bent by the beads 343.

[0138] In this case, since the refracted image light beams pass through the antiglare film 340 and intersect with each other, the antiglare film 340 may act as a lens. For example, a lens phenomenon may occur.

[0139] Specifically, when the effect of the lens phenomenon caused by the antiglare film 340 is greater than the scattering effect caused by it, flicker points may appear. As the resolution of the image display layer 320 becomes higher and higher and thus the size of the sub-pixels SP decreases, when the scattering effect of the beads 343 in the antiglare film 340 is non-uniform with respect to the size of the sub-pixels SP, this flicker may be perceived as a stronger indication of the lens effect in the internal transmitted light.

[0140] Referring Figure 6 , a graph of the luminance Lu as a function of the position P is shown.

[0141] Most of the luminance Lu according to the position P may be equal to a predetermined reference luminance Lu.

[0142] However, flickering may occur at the first position P1, the second position P2, and the third position P3. The luminance Lu of the flickering portion may be relatively high.

[0143] Specifically, when multiple sub-pixels are micro LEDs, this phenomenon may be more prominent.

[0144] Therefore, embodiments can provide a display device 100 capable of reducing image distortion.

[0145] Embodiments can provide a display device 100 capable of preventing or reducing flicker.

[0146] Embodiments can provide a display device 100 capable of equalizing the height of a texture structure.

[0147] Embodiments can provide a display device 100 capable of operating at low power by preventing or reducing flicker.

[0148] Figure 7 An antiglare layer 700 according to an embodiment is illustrated.

[0149] Referring Figure 7 , the antiglare layer 700 may include a base film SF, a first coating CTL1, a plurality of beads BD, and a second coating CTL2.

[0150] The base film SF may be disposed on the lowermost part of the antiglare layer 700.

[0151] The first coating CTL1 is disposed above the base film SF and may include a plurality of fine or microscopic texture structures. The first coating CTL1 may include acrylic acid or the like.

[0152] The plurality of beads BD may be disposed inside the texture structures. The first coating CTL1 may include the beads BD. The beads BD may be silica beads. The beads BD may be silica particles, polyacrylic resin, or polystyrene resin.

[0153] The beads BD may be spherical or in the shape of a sphere.

[0154] A portion of the first coating CTL1 containing the beads BD may protrude in the form of a texture structure. For example, the first coating CTL1 may include a plurality of texture structures.

[0155] Each texture structure of the first coating CTL1 may include two or more beads BD. Referring Figure 7 , each texture structure includes five beads BD, but the number of beads may be less than or more than five.

[0156] External light may be scattered by the beads BD. The external light may be incident on the beads BD and scattered into multiple light beams.

[0157] Referring Figure 7 , it can be seen that a plurality of beads BD are disposed in the first region A1. It can be seen that the external light is scattered by the beads BD.

[0158] The second coating CTL2 can be disposed above the first coating CTL1. The second coating CTL2 can include acrylic acid and the like.

[0159] The second coating CTL2 can be disposed above the first coating CTL1, but may not cover the entire first coating CTL1.

[0160] The second coating CTL2 can be disposed between the texture structures of the first coating CTL1.

[0161] An image display layer (not shown) can be disposed below the anti-glare layer 700. The image display layer (not shown) can emit imaging light to the anti-glare layer 700.

[0162] Since the second coating CTL2 can be disposed between the texture structures of the first coating CTL1, flicker caused by the imaging light can be prevented or reduced.

[0163] Refer to Figure 7 , the second coating CTL2 disposed in the second region A2 is shown. When the imaging light is emitted, the imaging light may not be scattered. For example, since the second coating CTL2 is disposed between the texture structures of the first coating CTL1, the imaging light may not be distorted.

[0164] Figure 8 is a graph illustrating the height of the texture structure according to an embodiment.

[0165] Refer to Figure 8 , graphs of the case where the second coating CTL2 is not disposed between the texture structures of the first coating CTL1 (before) and the case where the second coating CTL2 is disposed between the texture structures of the first coating CTL1 (after) are shown.

[0166] When the second coating CTL2 is not disposed between the texture structures of the first coating CTL1 (before), it can be seen that the height of the texture structure is somewhat irregular.

[0167] When the second coating CTL2 is disposed between the texture structures of the first coating CTL1 (after), it can be seen that the heights of the texture structures are similar to each other.

[0168] Because the heights of the texture structures are similar to each other, flicker that would otherwise be caused by the imaging light can be prevented or reduced.

[0169] The heights of the plurality of texture structures will be discussed in more detail below.

[0170] Figure 9 Experimental data on the height of the texture structure according to an example is illustrated.

[0171] Refer to Figure 9 , the experimental data can include five samples.

[0172] Each sample may include the arithmetic mean height Ra, the maximum height Rz, the height distribution Rku of the texture structure, and surface photo data. The units of the arithmetic mean height Ra, the maximum height Rz, and the height distribution Rku of the texture structure are micrometers.

[0173] Referring to Figure 9 , the surface photo data shows a plurality of texture structures. The corresponding texture structures may have different heights. The height of each texture structure is the distance between the high point and the low point of the texture structure.

[0174] To evaluate the data from multiple texture structures, concepts such as the height distribution, minimum value, maximum value, average value, arithmetic mean height, maximum height, etc. of the texture structure can be used.

[0175] The minimum value is the lowest value among the low points of the texture structure.

[0176] The maximum value is the highest value among the high points of the texture structure.

[0177] The average value is the sum of all the high points of the texture structure divided by the number of texture structures. The height from the average value to the low point or high point can be called the absolute height value.

[0178] The arithmetic mean height Ra of the texture structure refers to the absolute height value integrated by the number of samples and then divided by the number of samples. The arithmetic mean height Ra of the texture structure can also be called the roughness centerline average value, arithmetic average value, centerline average value, etc.

[0179] The maximum height Rz refers to the average value of the absolute values of the 5 highest values among the high points and the 5 lowest values among the low points relative to the average value. The maximum height Rz can also be called the ten-point average value of the roughness, etc.

[0180] The height distribution Rku represents the distribution of the height relative to the average value, which is a measure of the kurtosis of the profile of the height with respect to the average value. When the height distribution Rku is closer to 3, the height distribution is interpreted as being closer to the normal distribution. When the height distribution Rku is greater than 3, the height distribution is interpreted as being flat. When the height distribution Rku is less than 3, the height distribution is interpreted as being composed of constant heights of the texture structure. The height distribution Rku can be called kurtosis.

[0181] The arithmetic mean height Ra, the maximum height Rz, the height distribution Rku, etc. of the texture structure can be called parameters. The above parameters correspond to ISO 4287 defined by the International Organization for Standardization.

[0182] The arithmetic mean height Ra of the texture structure can be lower than a predetermined reference height.

[0183] When the height distribution Rku of the texture structure is 3 or less, it can be determined that the height distribution Rku of the texture structure is uniform.

[0184] In the first sample, Sample 1, the arithmetic mean height Ra of the texture structure is 0.1, the maximum height Rz is 0.8, and the height distribution Rku is 4.8. In this case, referring to the height distribution Rku and the surface photograph data, it can be seen that the height of the texture structure is approximately flat.

[0185] In the second sample (sample 2), the arithmetic mean height Ra of the texture structure is 0.15, the maximum height Rz is 1.4, and the height distribution Rku is 3.8. In this case, referring to the height distribution Rku and the surface photo data, it can be seen that the texture structure is slightly high.

[0186] In the third sample (sample 3), the arithmetic mean height Ra of the texture structure is 0.3, the maximum height Rz is 1.6, and the height distribution Rku is 3.1. In this case, referring to the height distribution Rku and the surface photo data, it can be seen that the height deviation of the texture structure increases.

[0187] In the fourth sample (sample 4), the arithmetic mean height Ra of the texture structure is 0.53, the maximum height Rz is 1.9, and the height distribution Rku is 2.7. In this case, referring to the height distribution Rku and the surface photo data, it can be seen that the height of the texture structure is uniform.

[0188] In the fifth sample (sample 5), the arithmetic mean height Ra of the texture structure is 0.18, the maximum height Rz is 0.7, and the height distribution Rku is 2.2. In this case, referring to the height distribution Rku and the surface photo data, it can be seen that the height of the texture structure is more uniform than that of sample 4.

[0189] By setting the arithmetic mean height Ra and the maximum height Rz of the texture structure, the height distribution Rku of the texture structure can be set to 3 or less. In this case, the maximum height of the texture structure can be greater than or equal to 2.0.

[0190] For example, the height distribution Rku of the texture structure of the anti-glare layer 700 may be 3 or less. The maximum height of the texture structure of the anti-glare layer 700 may be 2.0 or less.

[0191] Figure 10 , Figure 11 and Figure 12 Experimental data on a plurality of beads BD and the height of the texture structure according to examples are illustrated.

[0192] Reference Figure 10, showing the experimental data of bead size, the arithmetic mean height Ra of the texture structure, and the maximum height Rz of the texture structure. These are the experimental data of the arithmetic mean height Ra and the maximum height Rz of the texture structure according to the bead size.

[0193] The diameter of each bead BD can be greater than or equal to 0.8 and less than or equal to 3.5. By setting the diameter of the bead to be greater than or equal to 0.8 and less than or equal to 3.5, the height distribution Rku of the texture structure of the anti-glare layer 700 can be set to be less than or equal to 3.

[0194] When the bead size is 0.8, the arithmetic mean height Ra of the texture structure is 0.12, and the maximum height Rz of the texture structure is 0.78.

[0195] When the bead size is 1.5, the arithmetic mean height Ra of the texture structure is 0.17, and the maximum height Rz of the texture structure is 1.41.

[0196] When the bead size is 2, the arithmetic mean height Ra of the texture structure is 0.23, and the maximum height Rz of the texture structure is 1.52.

[0197] When the bead size is 3.5, the arithmetic mean height Ra of the texture structure is 0.53, and the maximum height Rz of the texture structure is 1.90.

[0198] Refer to Figure 11 , showing the arithmetic mean height Ra of the texture structure according to the bead size. The coefficient of determination R2 of the regression analysis is 0.9592. For example, the arithmetic mean height Ra of the texture structure can be estimated by controlling the bead size.

[0199] Refer to Figure 12 , showing the maximum height Rz of the texture structure according to the bead size. The coefficient of determination R2 of the regression analysis is 0.87. For example, the maximum height Rz of the texture structure can be estimated by adjusting the bead size.

[0200] In other words, the size of the bead can be the main factor for increasing the height of the texture structure.

[0201] Figure 13 A table showing the refractive index of the anti-glare layer 700 according to the example is illustrated.

[0202] Figure 14 and Figure 15 The anti-glare layer 700 according to the example is illustrated.

[0203] Refer to Figure 13 , showing the refractive index data of the anti-glare layer 700.

[0204] The refractive index of the anti-glare layer 700 may include a first refractive index n1 of the first coating CTL1, a second refractive index n2 of the beads BD, and a third refractive index n3 of the second coating CTL2.

[0205] Referring Figure 13 , the first refractive index n1 of the first coating CTL1, the second refractive index n2 of the beads BD, and the third refractive index n3 of the second coating CTL2 may be the same.

[0206] Each of the first refractive index n1, the second refractive index n2, and the third refractive index n3 may be between 1.49 and 1.65. Each of the first refractive index n1, the second refractive index n2, and the third refractive index n3 may be 1.5, but the present disclosure is not limited thereto. Data obtained by dividing the refractive index into three cases are described as examples.

[0207] In the first experimental example (Case 1), each of the first refractive index n1, the second refractive index n2, and the third refractive index n3 may be 1.5. Since the second coating CTL2 is disposed between the texture structures of the first coating CTL1 and has the same refractive index, flickering that would otherwise be caused by imaging light can be prevented or reduced. In Figure 14 is shown an anti-glare layer 700 to which the above-described first refractive index n1, second refractive index n2, and third refractive index n3 are applied.

[0208] In the second experimental example (Case 2), each of the first refractive index n1, the second refractive index n2, and the third refractive index n3 may be 1.6. The base film SF may be polyethylene terephthalate (PET). In Figure 14 is shown an anti-glare layer 700 to which the above-described first refractive index n1, second refractive index n2, and third refractive index n3 are applied.

[0209] In the third experimental example (Case 3), each of the first refractive index n1 and the second refractive index n2 may be 1.5. The refractive index n3 of the first portion CTL2a of the second coating CTL2 may be 1.5, and the refractive index n4 of the second portion CTL2b of the second coating CTL2 may be 1.3. In Figure 15 is shown an anti-glare layer 700 to which the above-described first refractive index n1, second refractive index n2, the refractive index n3 of the first portion CTL2a, and the refractive index n4 of the second portion CTL2b are applied. Referring Figure 15 , the second coating CTL2 may include a first portion CTL2a and a second portion CTL2b covering the first portion CTL2a. The second coating CTL2 may include the first portion CTL2a and the second portion CTL2b by a two-coating process. Since the second coating CTL2 includes the first portion CTL2a and the second portion CTL2b, a low-reflection function can be further obtained.

[0210] The above embodiments of the present disclosure are briefly reviewed as follows.

[0211] An embodiment may provide a display device including: a display panel on which a plurality of sub-pixels are arranged; and an antiglare layer disposed above the display panel, wherein the antiglare layer includes: a base film; a first coating disposed above the base film and including a plurality of texture structures; a plurality of beads disposed inside the texture structures; and a second coating disposed above the first coating.

[0212] The arithmetic mean height of the texture structures may be lower than a reference height.

[0213] The height distribution of the texture structures may be 3 or less.

[0214] The maximum height of the texture structures may be greater than or equal to 2.0 micrometers.

[0215] The diameter of the beads may be between 0.8 micrometers and 3.5 micrometers.

[0216] The first refractive index of the first coating, the second refractive index of the beads, and the third refractive index of the second coating may be the same.

[0217] Each of the first refractive index, the second refractive index, and the third refractive index may be between 1.49 and 1.65.

[0218] The base film may be made of polyethylene terephthalate.

[0219] The second coating may be disposed between the plurality of texture structures of the first coating.

[0220] The plurality of texture structures may protrude from the upper surface of the second coating.

[0221] The second coating may include a first portion and a second portion covering the first portion.

[0222] The refractive index of the second portion of the second coating may be lower than the refractive index of the first portion of the second coating.

[0223] According to an embodiment, the display device may reduce image distortion.

[0224] According to an embodiment, the display device may prevent or reduce flicker.

[0225] According to an embodiment, the display device may equalize the height of the texture structures.

[0226] According to an embodiment, the display device may be provided as a high-quality display device having improved image quality by preventing or reducing flicker.

[0227] The foregoing description is presented to enable one of ordinary skill in the art to make and use the inventive concept of the present disclosure and is provided in the context of a particular application and its requirements. Various modifications, additions, and substitutions to the described embodiments will be apparent to those of ordinary skill in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the inventive concept and scope of the present disclosure. The foregoing description and drawings provide examples of the inventive concept of the present disclosure for illustrative purposes only. For example, the disclosed embodiments are intended to illustrate the scope of the inventive concept of the present disclosure.

[0228] The various embodiments described above may be combined to provide other embodiments. If desired, aspects of the embodiments may be modified to incorporate concepts from various patents, applications, and publications to provide further embodiments.

[0229] These and other changes may be made to the embodiments in light of the above detailed description. In general, in the following claims, the terms used should not be construed as limiting the claims to the specific embodiments disclosed in the specification, but should be construed to include all possible embodiments and the full scope of equivalents to which the claims are entitled. Accordingly, the claims are not limited to the present disclosure.

[0230] Cross - reference to related applications

[0231] This application claims the priority and benefit of Korean Patent Application No. 10 - 2023 - 0185366, filed in Korea on December 19, 2023, the entire contents of which are incorporated herein by reference for all purposes as if fully set forth herein.

Claims

1. A display device, comprising: A display panel, the display panel comprising a plurality of sub-pixels; as well as an anti-glare layer, the anti-glare layer being arranged above the display panel, Wherein, the anti-glare layer comprises: Basement membrane; a first coating layer disposed over the base film and comprising a plurality of textured structures; a plurality of beads disposed within the plurality of textures; and A second coating layer is disposed over the first coating layer.

2. The display device according to claim 1, wherein: The arithmetic mean height of the texture structure is lower than the reference height.

3. The display device according to claim 1, wherein: The texture structure has a height distribution of 3 or less.

4. The display device according to claim 3, wherein: The maximum height of the texture structure is greater than or equal to 2.0 micrometers.

5. The display device according to claim 1, wherein: The diameter of the plurality of beads is between 0.8 microns and 3.5 microns.

6. The display device according to claim 1, wherein: The first refractive index of the first coating, the second refractive index of the plurality of beads, and the third refractive index of the second coating are the same.

7. The display device according to claim 6, wherein: Each of the first refractive index, the second refractive index, and the third refractive index is between 1.49 and 1.

65.

8. The display device according to claim 1, wherein: The base film includes polyethylene terephthalate.

9. The display device according to claim 1, wherein: The second coating layer is disposed between the plurality of textured structures of the first coating layer.

10. The display device according to claim 9, wherein: The plurality of texture structures protrude from an upper surface of the second coating layer.

11. The display device according to claim 1, wherein: The second coating layer includes a first portion and a second portion covering the first portion.

12. The display device according to claim 11, wherein: The second portion of the second coating has a refractive index lower than a refractive index of the first portion of the second coating.

13. A display device, comprising: Display panel; as well as An anti-glare layer, the anti-glare layer is disposed on the display panel, wherein the anti-glare layer comprises: a first layer, the first layer comprising a plurality of texture structures; a plurality of beads disposed within the plurality of textures; and A second layer is disposed on the first layer.

14. The display device according to claim 13, wherein: The first layer is a first coating layer and the second layer is a second coating layer, and the display device further comprises: A base film is disposed on the display panel, wherein the first coating layer is disposed on the base film.

15. The display device according to claim 13, wherein: The first refractive index of the first layer, the second refractive index of the plurality of beads, and the third refractive index of the second layer are the same.

16. The display device according to claim 13, wherein: The second layer at least partially fills spaces between consecutive texture structures of the plurality of texture structures of the first layer.

17. The display device according to claim 13, wherein: The refractive index of the first portion of the second layer is greater than the refractive index of the second portion of the second layer.

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