Display device

Abstract

A display device is provided. The display device includes a display module configured to define a display surface on a plane. The display module includes a display panel having a plurality of display elements configured to display an image on the display surface, and a pattern layer having a plurality of diffraction patterns arranged at intervals on the display panel. The diffraction patterns are arranged to diffract at least a portion of incident light. At least a portion of the diffraction patterns has a width different from the width of each of the remaining diffraction patterns.

Description

[0001] Cross - reference to related applications

[0002] This patent application claims the priority and benefit of Korean Patent Application No. 10 - 2018 - 0117968, filed on October 4, 2018, the entire content of which is incorporated herein by reference. Technical field

[0003] The present disclosure relates to a display device having improved display quality. Background art

[0004] With the development of multimedia, display devices have become increasingly important. Accordingly, various types of display devices such as liquid crystal displays (LCDs), organic light - emitting displays (OLEDs), etc. are used.

[0005] In the case of an organic light - emitting display (OLED), an emission area surrounded by a non - emission area may be defined on a display surface for displaying an image. When the resolution of the display is low or the display surface is magnified, the user may see the non - emission area. Summary of the invention

[0006] The present disclosure provides a display device having improved display quality.

[0007] Embodiments of the inventive concept provide a display device including a display module configured to define a display surface on a plane. The display module includes a display panel and a pattern layer. The display panel includes a plurality of display elements configured to display an image on the display surface, and the pattern layer includes a plurality of diffraction patterns arranged at intervals on the display panel. Wherein, the pattern layer is configured to diffract at least a part of the incident light, and at least a part of the plurality of diffraction patterns has a width different from the width of each of the remaining diffraction patterns.

[0008] In an embodiment, at least a part of the incident light diffracted by the diffraction pattern may be constructively interfered.

[0009] In an embodiment, each of the plurality of display elements is configured to display a pixel unit image on the display surface, the constructively interfered incident light may display a replicated pixel unit image between adjacent display elements, and the image may be defined by the pixel unit image and the replicated pixel unit image.

[0010] In an embodiment, the plurality of diffraction patterns include a plurality of hole shapes passing through the pattern layer.

[0011] In an embodiment, the plurality of diffraction patterns may include a first pattern and a second pattern, each of the first patterns having a first width, and each of the second patterns having a second width greater than the first width.

[0012] In an embodiment, the ratio of the second pattern to the first pattern on the pattern layer may be in the range of about 20% to about 80%.

[0013] In an embodiment, the number of the first patterns on the pattern layer may be the same as the number of the second patterns. In an embodiment, the ratio of the width of each of the diffraction patterns to the pitch of the diffraction patterns may be in the range of about 5% to about 95%.

[0014] In an embodiment, the diffraction pattern may further include a third pattern, each of the third patterns having a third width smaller than the first width.

[0015] In an embodiment, the first patterns may form a plurality of first columns on a plane, the second patterns may form a plurality of second columns on the plane, and the first columns and the second columns may be arranged alternately.

[0016] In an embodiment, the first patterns and the second patterns may be arranged alternately on a plane in a first direction and a second direction perpendicular to the first direction.

[0017] In an embodiment, the display panel may include a base layer, a circuit layer, and a encapsulation layer, the circuit layer being on the base layer and including a plurality of display elements, and the encapsulation layer being on the circuit layer and having the same refractive index as the pattern layer.

[0018] In an embodiment, the encapsulation layer may include the same material as the pattern layer.

[0019] In an embodiment, each of the plurality of diffraction patterns may have a shape protruding upward from the top surface of the display module.

[0020] In an embodiment, each of the plurality of diffraction patterns may have a circular shape on a plane.

[0021] In an embodiment, each of the plurality of diffraction patterns may have a polygonal shape on a plane.

[0022] In an embodiment, each of the plurality of display elements may include an organic light emitting element.

[0023] In an embodiment, the display device may further include an anti-reflection layer on the display module, wherein the anti-reflection layer may include a phase retardation layer and a polarization layer, the phase retardation layer being configured to retard the phase of one component of incident light, and the polarization layer being on the phase retardation layer.

[0024] In an embodiment of the inventive concept, a display device includes a display module configured to define a display surface on a plane. The display module includes a plurality of organic light-emitting elements, a encapsulation layer, and a pattern layer. The plurality of organic light-emitting elements are configured to display an image on the display surface. The encapsulation layer is configured to cover the plurality of organic light-emitting elements. The pattern layer is on the encapsulation layer and has the same refractive index as the encapsulation layer. The pattern layer includes a plurality of diffraction patterns arranged at intervals, the intervals being configured to cause constructive interference with at least a portion of incident light generated by the plurality of organic light-emitting elements. The plurality of diffraction patterns include a plurality of patterns having different widths from each other.

[0025] In an embodiment of the inventive concept, a display device includes a base layer, a display layer, an encapsulation layer, and a pattern layer. The display layer is on the base layer and includes a plurality of organic light-emitting elements. The encapsulation layer is on the display layer. The pattern layer includes the same material as the encapsulation layer. A plurality of diffraction patterns having a constant interval are defined in the pattern layer. The plurality of diffraction patterns include a first pattern and a second pattern. Each of the first patterns has a first width. Each of the second patterns has a second width greater than the first width. The first pattern causes constructive interference with the second pattern. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings are included to provide a further understanding of the inventive concept, and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments of the inventive concept and, together with the specification, serve to explain the principles of the inventive concept. In the drawings:

[0027] Figure 1 is a perspective view of a display device according to an embodiment of the inventive concept;

[0028] Figure 2 is a cross-sectional view taken along line I-I' of Figure 1 ;

[0029] Figure 3 is an enlarged perspective view showing a part of a region of the display module of Figure 2 ;

[0030] Figure 4 is Figure 3 an equivalent circuit diagram of one pixel of

[0031] Figure 5 is Figure 3 an enlarged cross-sectional view of the display module of

[0032] Figure 6 is a schematic diagram showing a state in which second light of Figure 5 is diffracted;

[0033] Figure 7It is a plan view of a replicated pixel unit image displayed by diffracted light on a display surface;

[0034] Figure 8A and Figure 8B It is a plan view showing a comparative example of a pattern layer;

[0035] Figure 9 It is shown according to Figure 8A and Figure 8B A graph showing the relative relationship between the brightness of a display device and the SDE index for each width in the pattern;

[0036] Figure 10A and Figure 10B It is a plan view of a pattern layer according to an embodiment of the inventive concept;

[0037] Figure 11 It is shown according to Figure 10A and Figure 10B A graph showing the relationship between the brightness of a display device and the SDE index for each width in the pattern;

[0038] Figure 12A and Figure 12B It is a plan view of a pattern layer according to another embodiment of the inventive concept;

[0039] Figure 13 It is shown according to Figure 12A and Figure 12B A graph showing the relationship between the brightness of a display device and the SDE index for each width in the pattern;

[0040] Figure 14 It is a plan view of a pattern layer according to another embodiment of the inventive concept;

[0041] Figure 15 It is a plan view of a pattern layer according to another embodiment of the inventive concept;

[0042] Figure 16 It is a plan view of a pattern layer according to another embodiment of the inventive concept;

[0043] Figure 17 It is a plan view of a pattern layer according to another embodiment of the inventive concept; and

[0044] Figure 18 It is an enlarged perspective view showing a part of a display module according to another embodiment of the inventive concept. Detailed Description

[0045] Hereinafter, exemplary embodiments of a display device will be described in more detail with reference to the accompanying drawings, in which like reference numerals always denote like elements. However, the exemplary embodiments of the inventive concept may be implemented in various different forms and should not be construed as being limited only to the embodiments shown herein. Rather, these embodiments are provided as examples so that this disclosure will be thorough and complete, and will fully convey the aspects and features of the present invention to those skilled in the art. Accordingly, processes, elements, and techniques that are not necessary for a person of ordinary skill in the art to completely understand the aspects and features of the inventive concept may not be described. Unless otherwise noted, like reference numerals in the entire drawings and the written description denote like elements and thus their description may not be repeated. In the drawings, the relative sizes of elements, layers, and regions may be exaggerated for clarity.

[0046] It should be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. Without departing from the spirit and scope of the inventive concept, these terms are used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Thus, the first element, component, region, layer, or portion discussed below may be referred to as the second element, component, region, layer, or portion.

[0047] Spatial relative terms such as "beneath", "below", "lower", "under", "above", "upper", etc. may be used herein for convenience of explanation to describe the relationship of one element or feature to another element or feature as shown in the figures. It should be understood that, in addition to the orientation shown in the figures, the spatial relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the figures is turned over, an element described as "below" or "beneath" or "under" another element or feature will then be oriented "above" the other element or feature. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (e.g., rotated 90 degrees or in other orientations), and the spatial relative descriptors used herein should be interpreted accordingly.

[0048] It should be understood that when an element or layer is referred to as being "on", "connected to", or "coupled to" another element or layer, the element or layer can be directly on, directly connected to, or directly coupled to the other element or layer, or there can be one or more intervening elements or layers. Additionally, it should also be understood that when an element or layer is referred to as being "between" two elements or layers, the element or layer can be the only element or layer between the two elements or layers, or there can also be one or more intervening elements or layers.

[0049] The terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the inventive concept. Unless clearly indicated otherwise in the context, the singular forms "a" and "an" as used herein are also intended to include the plural forms. It should also be understood that when the terms "comprise", "comprising", "include", and "including" are used in this specification, they indicate the presence of the stated features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or their groups. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Expressions such as "at least one", when following a list of elements, modify the entire list of elements and not individual elements in the list.

[0050] As used herein, the terms "substantially", "about", and similar terms are used as approximate terms rather than terms of degree, and are intended to account for the inherent deviations of measured or calculated values that would be recognized by a person of ordinary skill in the art. Additionally, when describing embodiments of the present invention, the use of "may" refers to "one or more embodiments of the present invention". As used herein, the terms "use", "using", and "used" can be considered to be synonymous with the terms "utilize", "utilizing", and "utilized", respectively. Moreover, the term "exemplary" is intended to mean an example or illustration.

[0051] The display device and / or any other related devices or components according to embodiments of the inventive concept described herein may be implemented using any suitable hardware, firmware (e.g., application specific integrated circuit), software, or a combination of software, firmware, and hardware. For example, the display device may include a display module having a display panel including a plurality of display elements (e.g., pixels), a pattern layer on the display panel, an input sensing layer on the pattern layer, an anti-reflection layer on the input sensing layer, and a window on the anti-reflection layer. Various components of these devices may be formed on one integrated circuit (IC) chip or formed on separate IC chips. Additionally, various components of these devices may be implemented on a flexible printed circuit film, tape carrier package (TCP), printed circuit board (PCB), or formed on one substrate.

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

[0053] Hereinafter, exemplary embodiments of the inventive concept will be described with reference to the accompanying drawings.

[0054] Figure 1 is a perspective view of a display device according to an embodiment of the inventive concept, and Figure 2 is a cross-sectional view taken along line Figure 1 I-I' of

[0055] Referring to Figure 1 and Figure 2 , a display device 1000 according to an embodiment of the inventive concept has a rectangular shape having a long side in a first direction DR1 and a short side in a second direction DR2 perpendicular to the first direction DR1. For convenience of description, the shape of the display device 1000 is merely an example, and embodiments of the inventive concept are not limited to the shape of the display device 1000. For example, as will be understood by those skilled in the art, various embodiments of the inventive concept may have any suitable shape including various regular or irregular shapes.

[0056] The display device 1000 has a display surface IS, which includes a display area DA and a non-display area NDA on a plane defined by a first direction DR1 and a second direction DR2. The display area DA is defined at the central area of the display device 1000. An image IMG can be displayed on the display area DA. The non-display area NDA has a frame shape surrounding (e.g., encircling) the display area DA on the plane. The image IMG is not displayed on the non-display area NDA. Embodiments of the inventive concept are not specifically limited to the shapes of the display area DA and the non-display area NDA.

[0057] In the present embodiment, the normal direction of the display surface IS (i.e., the direction in which the image IMG is displayed) may be indicated as a third direction DR3. The front surface (or top surface) and the rear surface (or bottom surface) of each of the components are indicated by the third direction DR3. The front surface (or top surface) and the rear surface (or bottom surface) of each of the components can be distinguished by the third direction DR3. However, the directions indicated by the first direction DR1, the second direction DR2, and the third direction DR3 may be relative concepts and thus can be changed to different directions.

[0058] The display device 1000 includes a display module DM. The display surface IS may be defined on the top surface of the display module DM. The display module DM includes a display panel 100 having a plurality of display elements (e.g., pixels) and a pattern layer 200 disposed on the display panel 100. The pattern layer 200 diffracts at least a part of the light provided from the display panel 100 to display the image IMG on the display surface IS. A more detailed description of the display panel 100 and the pattern layer 200 will be made with reference to Figures 3 to 11 a more detailed description of the display panel 100 and the pattern layer 200.

[0059] The display device 1000 according to the present embodiment may further include an input sensing layer 300, an anti-reflection layer 400, and a window 500.

[0060] The input sensing layer 300 is disposed on the display module DM. The input sensing layer 300 senses an external input provided to the display device 1000.

[0061] For example, the input sensing layer 300 may sense an external input provided by a user's body (e.g., using a finger). According to the inventive concept, the external input is not limited to a specific method. According to another embodiment of the inventive concept, the external input may be provided in any suitable manner, such as optically, by touch, magnetically, or other suitable manners that those skilled in the art will understand.

[0062] Although not shown, the input sensing layer 300 may include a plurality of input sensing electrodes for sensing an external input.

[0063] The input sensing layer 300 may sense external input in various ways. For example, the input sensing layer 300 may be driven in a capacitive, resistive, or coordinate recognition manner.

[0064] The antireflection layer 400 is disposed on the input sensing layer 300. The antireflection layer 400 overlaps the display area DA in a plane. The antireflection layer 400 may prevent external light (e.g., incident on the display device 1000) from being reflected by the display module DM and being visible to the user. Although not shown, the antireflection layer 400 may include a polarization layer and a phase retardation layer.

[0065] The polarization layer has a transmission axis and an absorption axis perpendicular to the transmission axis. One or more components of the external light incident on the polarization layer may be absorbed or reflected by the absorption axis so that the light does not pass through the polarization layer. The component perpendicular to one component of the components of the external light (e.g., incident light) incident on the polarization layer may pass through the polarization layer. That is, the polarization layer may linearly polarize the external light.

[0066] In the present embodiment, the polarization layer may be made of a polymer resin elongated in a specific direction. However, embodiments of the inventive concept are not limited to one type of polarization layer. In another embodiment of the inventive concept, the polarization layer may be a wire grid polarizer.

[0067] The phase retardation layer is disposed below the polarization layer. The phase retardation layer has optical anisotropy. Thus, the phase retardation layer may retard the phase of one or more components of the incident light. That is, the phase retardation layer may convert the polarization state of the light. For example, the phase retardation layer may retard the phase of one component of the incident light by about a wavelength of λ / 4. That is, the phase retardation layer may be a quarter-wave film. Thus, the phase of one component of the light passing through the phase retardation layer may be retarded to convert the linear polarization state to a circular polarization state or to convert the circular polarization state to a linear polarization state.

[0068] According to the present embodiment, even if the external light incident on the display device 1000 from the outside is reflected by the display module DM, the polarization state may be converted by the phase retardation layer so that the light is absorbed or reflected by the polarization layer. That is, the external light reflected by the display module DM may not be visible from the outside of the display device 1000.

[0069] Although the antireflection layer 400 is disposed above the display panel 100 in the present embodiment, various embodiments of the inventive concept are not limited thereto. For example, according to another embodiment of the inventive concept, the antireflection layer 400 may be disposed in the display panel 100.

[0070] The window 500 is disposed on the antireflection layer 400. The window 500 provides the front surface of the display device 1000 to protect the antireflection layer 400, the input sensing layer 300, and the display module DM. For example, the window 500 may include a glass substrate, a sapphire substrate, or a plastic film. The window 500 may have a single-layer or multi-layer structure. For example, the window 500 may have a stacked structure of a plurality of plastic films coupled to each other using an adhesive or a stacked structure of a glass substrate and a plastic film coupled to each other using an adhesive.

[0071] Although not shown, the display device 1000 may further include a plurality of adhesive members. The adhesive members may be disposed between the input sensing layer 300 and the antireflection layer 400 to couple the input sensing layer 300 and the antireflection layer 400 to each other. Moreover, the adhesive members may be disposed between the antireflection layer 400 and the window 500 to couple the antireflection layer 400 and the window 500 to each other.

[0072] According to another embodiment of the inventive concept, at least one of the input sensing layer 300, the antireflection layer 400, and the window 500 may be omitted.

[0073] Figure 3 is a magnified perspective view of a part of the region of the display module shown Figure 2 thereof.

[0074] For convenience of description, the sub-package layer SL of Figure 3 is omitted in Figure 2 .

[0075] Referring to Figure 2 and Figure 3 , the display panel 100 according to an embodiment of the inventive concept may be an organic light-emitting display panel. Thus, each of the display elements of the display panel 100 according to the present embodiment may be an organic light-emitting element OLED (see Figure 4 and Figure 5 ).

[0076] In particular, the display element may include a base layer BS, a display layer CL, a package layer EN, and a sub-package layer SL. The base layer BS defines the rear surface of the display panel 100. The base layer BS may be a base layer for forming electrodes and display elements included in the display panel 100. For example, the base layer BS may be provided in the form of a substrate.

[0077] In conjunction with Figure 2 and Figure 3 , the display layer CL is disposed above the base layer BS. The display layer CL includes a pixel layer PXL and a circuit layer CRL. Figure 5

[0078] According to an embodiment of the inventive concept, the type of the display panel 100 may be determined according to the configuration of the display layer CL. The display panel 100 may be an organic light emitting display panel, a liquid crystal display panel, an electrophoretic display panel, or an electro-wetting display panel, or may be one of various other display panels capable of displaying images well-known to those skilled in the art. In addition, the display panel 100 according to the inventive concept may include various embodiments, but is not limited to one embodiment. In the drawings to be described below, a case where the display panel 100 is an organic light emitting display panel will be shown as an example.

[0079] The circuit layer CRL is disposed on the base layer BS. The circuit layer CRL may include a plurality of thin film transistors for driving the organic light emitting elements OLED and a plurality of signal lines.

[0080] The pixel layer PXL is disposed on the circuit layer CRL. The pixel layer PXL includes a plurality of organic light emitting elements OLED and a pixel defining layer PDL that separates the organic light emitting elements OLED. One organic light emitting element OLED of the pixel layer PXL and at least one thin film transistor of the circuit layer CRL connected to one organic light emitting element OLED may define one pixel PX. That is, the display panel 100 according to the present embodiment includes a plurality of pixels PX.

[0081] The encapsulation layer EN is disposed on the display layer CL. The encapsulation layer EN covers the display layer CL to protect the display layer CL from the influence of elements from the outside. The encapsulation layer EN may include an inorganic material. For example, the encapsulation layer EN may be provided in the form of a glass substrate.

[0082] Although not shown, the display device 1000 may further include a sealing member for sealing the base layer BS and the encapsulation layer EN on the non-display area NDA.

[0083] The sub-encapsulation layer SL is disposed between the encapsulation layer EN and the display layer CL. That is, the encapsulation layer EN may be spaced apart from the display layer CL by a distance (e.g., a predetermined distance), and the sub-encapsulation layer SL may be positioned in the space between the encapsulation layer EN and the display layer CL. In the present embodiment, the sub-encapsulation layer SL may be a filler. For example, the sub-encapsulation layer SL may be an inert gas. The sub-encapsulation layer SL may prevent foreign substances present between the encapsulation layer EN and the display layer CL from diffusing.

[0084] Although not shown, according to another embodiment of the inventive concept, the sub-encapsulation layer SL may be omitted. In this case, the encapsulation layer EN may be disposed on the display layer CL to contact and cover the display layer CL. In the present embodiment, the encapsulation layer EN may include a plurality of stacked organic layers and / or inorganic layers. Moreover, the encapsulation layer EN may be used as a planarization layer for planarizing the top surface of the display layer CL. The encapsulation layer EN according to the embodiment may have various shapes, but is not limited to one embodiment.

[0085] According to an embodiment of the inventive concept, the pattern layer 200 may be disposed on the encapsulation layer EN. The pattern layer 200 may have, for example, the same refractive index as the encapsulation layer EN. For example, each of the pattern layer 200 and the encapsulation layer EN may have a refractive index of about 1.4 to about 1.6.

[0086] In an embodiment of the inventive concept, the pattern layer 200 may include the same material as the encapsulation layer EN.

[0087] The pattern layer 200 may include a plurality of diffraction patterns DFP. The diffraction patterns DFP are arranged on the pattern layer 200 in the form of a matrix having a plurality of rows and columns in a first direction DR1 and a second direction DR2. The diffraction patterns DFP have a pitch (e.g., a predetermined pitch) a.

[0088] In this embodiment, each of the diffraction patterns DFP has a hole shape passing through the pattern layer 200. For example, the pattern layer 200 includes a plurality of holes DFP passing through the pattern layer 200 in a third direction DR3, and the plurality of holes DFP are defined as the diffraction patterns DFP. In this embodiment, each of the diffraction patterns DFP may have a circular shape on a plane.

[0089] In this embodiment, the diffraction patterns DFP may diffract at least a part of light incident on the pattern layer 200 to display an image IMG on the display surface IS (see Figure 1 ). Hereinafter, diffraction of light will be described in more detail with reference to Figures 5 to 7 .

[0090] Figure 4 is Figure 3 an equivalent circuit diagram of one pixel.

[0091] Referring to Figure 4 , one pixel PX includes at least one thin film transistor, at least one capacitor, and at least one display element. In this embodiment, the pixel PX includes a first thin film transistor TFT1, a second thin film transistor TFT2, a capacitor Cap, and an organic light emitting diode OLED. The first thin film transistor TFT1 includes a control electrode connected to a scan line SLi, an input electrode connected to a data line DL, and an output electrode. The first thin film transistor TFT1 outputs a data signal applied to the data line DL in response to a scan signal applied to the scan line SLi.

[0092] The capacitor Cap includes a first capacitor electrode connected to the first thin film transistor TFT1 and a second capacitor electrode for receiving a first power supply voltage ELVDD. The capacitor Cap is charged by an amount corresponding to a difference between a voltage corresponding to the data signal received from the first thin film transistor TFT1 and the first power supply voltage ELVDD.

[0093] The second thin film transistor TFT2 includes a control electrode connected to the output electrode of the first thin film transistor TFT1 and the first capacitor electrode of the capacitor Cap, an input electrode for receiving the first power supply voltage ELVDD, and an output electrode. The output electrode of the second thin film transistor TFT2 is connected to the organic light emitting element OLED.

[0094] The second thin film transistor TFT2 controls the driving current flowing through the organic light emitting element OLED to correspond to the amount of charge stored in the capacitor Cap. The on-time of the second thin film transistor TFT2 is determined according to the amount of charge charged in the capacitor Cap. The output electrode of the second thin film transistor TFT2 supplies a voltage having a level lower than the first power supply voltage ELVDD to the organic light emitting element OLED.

[0095] The organic light emitting element OLED includes a first electrode EL1 (for example, refer to Figure 5 ) connected to the second thin film transistor TFT2 and a second electrode EL2 for receiving the second power supply voltage ELVSS. The organic light emitting element OLED may include a light emitting layer OL disposed between the first electrode EL1 and the second electrode EL2.

[0096] The organic light emitting element OLED emits light during the on-period of the second thin film transistor TFT2. The light generated in the organic light emitting element OLED may have a color determined by the material forming the light emitting pattern (for example, the organic light emitting element OLED). For example, the color of the light generated in the organic light emitting element OLED may be one of red, green, blue, and white. The organic light emitting element OLED substantially defines an emission region PXA (refer to Figure 7 ) on the display panel 100.

[0097] Figure 5 is Figure 3 an enlarged cross-sectional view of the display module, and Figure 6 is a schematic diagram showing Figure 5 the state in which the second light is diffracted. For convenience of description, only one cross-section of the display module DM cut along a line parallel to the second direction DR2 is shown in Figure 5 and Figure 6 . According to an embodiment of the inventive concept, the display module DM to be described later may have the same configuration as the cross-section of the display module DM cut along a line parallel to the first direction DR1.

[0098] Refer to Figure 5 、 Figure 6, an organic light-emitting device OLED according to an embodiment of the inventive concept generates a first light L1 and a second light L2. The first light L1 and the second light L2 are emitted from the organic light-emitting device OLED and travel upward in a third direction DR3 perpendicular to the display surface IS. The first light L1 and the second light L2 may be defined as front light. The first light L1 passes through the sub-encapsulation layer SL, the encapsulation layer EN, and the diffraction pattern DFP to display a pixel unit image IM on the display surface IS.

[0099] Light other than the first light L1 and the second light L2 emitted from the organic light-emitting device OLED may be defined as side light. For convenience of description, only the first light L1 and the second light L2 are shown in Figure 5 , which are defined as light emitted from the organic light-emitting device OLED in a direction angled at a first angle θ1 with respect to the first light L1.

[0100] The second light L2 may pass through the sub-encapsulation layer SL and the encapsulation layer EN in a direction angled at a first angle θ1 with respect to the first light L1. The second light L2 may be refracted by the interface between the sub-encapsulation layer SL and the encapsulation layer EN. The refracted second light L2 may be angled at a second angle θ2 with respect to the first light L1.

[0101] The second light L2 refracted at the second angle θ2 is incident on the encapsulation layer EN. The second light L2 may pass through the encapsulation layer EN and be incident on the diffraction pattern DFP. The incident second light L2 may be diffracted by the diffraction pattern DFP.

[0102] According to an embodiment of the inventive concept, the diffraction pattern DFP having a spacing a1 (e.g., a predetermined spacing a1) may diffract the second light L2 incident at the second angle θ2 with respect to the first light L1 of the incident light to display a replicated pixel unit image IM' on the display surface IS. That is, the second light L2 may be incident on the diffraction pattern DFP at the second angle θ2 to display the replicated pixel unit image IM'. According to an embodiment of the inventive concept, the spacing a1 of the diffraction pattern DFP may be from about 5 μm to about 7 μm.

[0103] According to this embodiment, the second light L2 emitted from the organic light-emitting device OLED at the first angle θ1 with respect to the first light L1 is refracted by the intermediate members SL and EN and is incident on the diffraction pattern DFP at the second angle θ2 with respect to the first light L1. In this embodiment, although the intermediate members SL and EN include the sub-encapsulation layer SL and the encapsulation layer EN, the embodiments of the inventive concept are not limited to the number and types of the intermediate members. For example, in another embodiment of the inventive concept, a separate member may be provided between the pixel layer PXL and the pattern layer 200 to adjust the length of the optical path through which the light emitted from the organic light-emitting device OLED travels to the diffraction pattern DFP to be within a range that satisfies the diffraction condition.

[0104] As described above, the diffraction pattern DFP diffracts the second light L2 to display one or more replicated pixel unit images IM' on the display surface IS.

[0105] According to an embodiment of the inventive concept, the second light L2 may include a first sub-light L21 and a second sub-light L22. Each of the first sub-light L21 and the second sub-light L22 is angled with respect to the first light L1 at a second angle θ2, and the first sub-light L21 and the second sub-light L22 are incident on the diffraction pattern DFP in different (e.g., different from each other) manners. For example, there may be a difference in the optical paths of the first sub-light L21 and the second sub-light L22. The difference in the optical paths may be defined as a first distance R.

[0106] According to this embodiment, the first sub-light L21 and the second sub-light L22 may be diffracted by the diffraction pattern DFP to interfere constructively with each other. For example, a phase difference may occur between the first sub-light L21 and the second sub-light L22. The phase difference may be equal to the wavelength λ of the second light L2. Therefore, the first distance R may be proportional to the wavelength λ of the second light L2. The first sub-light L21 and the second sub-light L22 that interfere constructively display the replicated pixel unit image IM' on the display surface IS.

[0107] Figure 7 is a plan view of the replicated pixel unit image displayed on the display surface by the diffracted light. For convenience of description, only one emission area PXA among a plurality of emission areas PXA is shown in Figure 7 FIG.

[0108] Referring to Figure 7 , the display surface IS according to an embodiment of the inventive concept includes a plurality of emission areas PXA and a plurality of replication areas PRA. The plurality of replication areas PRA are arranged around (e.g., surround) one emission area PXA. In this embodiment, the replication areas PRA may be defined on both sides of one emission area PXA in a first direction DR1 and a second direction DR2. Each of the emission areas PXA may have the same shape as each of the replication areas PRA. In Figure 7 FIG., although each of the emission area PXA and the replication area PRA has a rhombus shape, the embodiment of the inventive concept is not specifically limited to this shape.

[0109] The emission areas PXA and the replication areas PRA are arranged to be spaced apart from each other. The interval between one emission area PXA and one replication area PRA adjacent to the corresponding emission area PXA is referred to as a replication interval PP. The replication interval PP is the distance between the center of one emission area PXA and the center of one replication area PRA.

[0110] According to the present embodiment, the first light L1 emitted from the organic light-emitting diode OLED can pass through the intermediate members SL and EN to display the pixel unit image IM on the emission area PXA of the display surface IS. The pixel unit image IM has a shape corresponding to the planar shape of the organic light-emitting diode OLED. Further, the second light L2 emitted from the organic light-emitting diode OLED can pass through the intermediate members SL and EN to display the replicated pixel unit image IM' on the replication area PRA of the display surface IS. The replicated pixel unit image IM' can be the same shape as the pixel unit image IM. The image IMG (see Figure 1 ) displayed by the display module DM can provide a hybrid shape of the pixel unit image IM and the replicated pixel unit image IM' to the user.

[0111] According to an embodiment of the inventive concept, the pixel unit image IM and the replicated pixel unit image IM' can be displayed on the display surface IS by using the light emitted from one organic light-emitting diode OLED. That is, the pixel unit image IM provided from one organic light-emitting diode OLED can be replicated one or more times.

[0112] Different from the present embodiment of the inventive concept, when the display device 1000 does not include the diffraction pattern DFP for displaying the replicated pixel unit image IM', the non-emission area defined as the area occupied by the pixel defining layer PDL (see Figure 5 ) between the emission areas PXA on the existing display surface IS can be seen from the outside. The phenomenon that the non-emission area can be seen is referred to as the screen door effect (SDE) phenomenon. For example, when the display device 1000 is magnified and applied to a head-mounted device (HMD) in which the display surface IS is magnified and provided to the user, the SDE phenomenon may be more obvious. However, according to the embodiment of the inventive concept, since the replication area PRA on which the separate pixel unit image is displayed is formed on the non-emission area, the phenomenon of the non-emission area that can be seen by the user from the outside can be prevented. That is, the display device 1000 can have improved display quality.

[0113] According to an embodiment of the inventive concept, the diffraction pattern DFP can include a plurality of diffraction patterns having different widths. Hereinafter, this will be described with reference to Figure 8A and Figure 11 which will be described below.

[0114] Figure 8A and Figure 8B are plan views showing comparative examples of the pattern layer, and Figure 9 is a graph showing the relative relationship between the brightness of the display device and the SDE index for each width of the patterns according to Figure 8A and Figure 8B .

[0115] With reference to Figure 7 , Figure 8A , Figure 8B and Figure 9 , the brightness of the image IMG (see Figure 1 ) displayed on the display surface IS and the SDE index that appears on the display surface IS can vary according to the width of each in the diffraction pattern DFP by the pixel unit image IM and the replicated pixel unit image IM'. The SDE index is an index indicating the degree of occurrence of the SDE phenomenon. The more the SDE index decreases on the display surface IS, the larger the above non-emitting area that the user can see.

[0116] In the Figure 9 graph, the x-axis represents the dimensions of the widths b1 and b1' of the diffraction pattern DFP, or the ratio of the widths b1 and b1' to the interval a1. Here, the diffraction patterns DFP and DFP' can have a constant interval a1. For example, the interval a1 can be about 3 μm to about 9 μm, and the ratio of the widths b1 and b1' to the interval a1 can be in the range of about 5% to 95%.

[0117] In the Figure 9 graph, the y-axis represents the brightness A and the SDE index B of the image IMG (see Figure 1 ). The graph representing the brightness of the image IMG (see Figure 1 ) is shown as a scatter plot of A, and the SDE index is shown as a scatter plot of B.

[0118] Experimentally, the brightness A and the SDE index B according to the width of each in the diffraction pattern DFP can be different from each other in the waveform graph. The brightness A according to the width of each in the diffraction pattern DFP can have an inverse relationship with the SDE index B according to the width of each in the diffraction pattern DFP. For example, when the diffraction pattern DFP has a specific width, the brightness A can have a maximum value, and the SDE index B can have a minimum value.

[0119] With reference to Figure 8A and Figure 8B , in the process of forming the diffraction patterns DFP and DFP' on the encapsulation layer EN (see Figure 4 and Figure 5 ), the diffraction patterns DFP and DFP' can have different widths in each region.

[0120] For example, the diffraction patterns DFP and DFP' may have a first width b1 or a first error width b1'. For example, the first error width b1' may be greater than the first width b1. An area on the pattern layer 200 where the diffraction pattern DFP having the first width b1 is formed may be defined as a first area AR1. An area on the pattern layer 200 where the diffraction pattern DFP' having the first error width b1' is formed may be defined as a second area AR2. The difference between the first width b1 and the first error width b1' may be equal to or greater than about 0.3 μm.

[0121] Each of the first area AR1 and the second area AR2 is not limited in number and may be located on the pattern layer 200. The diffraction pattern DFP' disposed on the second area AR2 may be provided by a process error in the process of forming the diffraction pattern DFP on the encapsulation layer EN. For example, when the diffraction pattern DFP is formed by a lithography process, the error in the process may be a difference in etching amount, exposure amount, or thickness between the first area AR1 and the second area AR2.

[0122] Referring to Figure 8A 、 Figure 8B and Figure 9 , since the diffraction patterns DFP and DFP' have different widths b1 and b1' from each other, the luminance A and the SDE index B of the first area AR1 may be different from the luminance A and the SDE index B of the second area AR2. In this case, according to the luminance and the SDE index, the image IMG (see Figure 1 ) displayed on the display surface IS may be visibly different. That is, the display quality of the display device 1000 may deteriorate. For example, the first area AR1 where the diffraction pattern DFP having the first width b1 is formed may have a value of x1 in the x-axis and a luminance value of y1 in the y-axis. The second area AR2 where the diffraction pattern DFP' having the first error width b1' is formed may have a value of x1' on the x-axis and a luminance value of y1' on the y-axis. The luminance difference dy1 between the first area AR1 and the second area AR2 may be y1 - y1'. In the above example, the luminance difference dy1 has a negative value.

[0123] In the above example, although only the difference in luminance A is explained, the SDE index B may also have a difference between the first area AR1 and the second area AR2. Here, since the SDE index B has a value opposite to that of the luminance A, the difference value may have a positive value.

[0124] Figure 10A and Figure 10B are plan views of a pattern layer according to an embodiment of the inventive concept, and Figure 11 is a view showing according to Figure 10A and Figure 10BA graph showing the relationship between the luminance of a display device and the SDE index for each width in a pattern.

[0125] Referring to Figure 10A and Figure 10B According to Embodiments of the inventive concept, the diffraction patterns DFP and DFP' of the first region AR1 and the second region AR2 may include a plurality of patterns PT1, PT2, PT1', and PT2'.

[0126] For example, the diffraction pattern DFP disposed on the first region AR1 includes a first pattern PT1 and a second pattern PT2. In this embodiment, each of the first patterns PT1 may be similar to each of the second patterns PT2. Each of the first patterns PT1 may have the same configuration as each of the Figure 8A diffraction patterns DFP. That is, each of the first patterns PT1 has a first width b1. Each of the second patterns PT2 has a second width b2. In this embodiment, the second width b2 may be greater than the first width b1. Although not shown, according to this embodiment, the ratio of the number of the second patterns PT2 to the number of the first patterns PT1 on the pattern layer 200 may be about 20% to about 80%. In another embodiment, the number of the first patterns PT1 on the pattern layer 200 may be equal to the number of the second patterns PT2. In various embodiments of the inventive concept, the first pattern PT1 and the second pattern PT2 may correspond to the pixel layout of a display device (e.g., the display device 1000 described above). For example, in various embodiments of the inventive concept, the display device may have a pixel layout including pixels having different sizes and shapes, and the first pattern PT1 and the second pattern PT2 may correspond to the size and shape of the pixel layout of the display device. For example, in various embodiments of the inventive concept, the green pixels of the display device may have a size greater than that of the red pixels or the blue pixels of the display device. In other embodiments of the inventive concept, the blue pixels may be larger than the red pixels and the green pixels, or the red pixels may be larger than the green pixels and the blue pixels.

[0127] In this embodiment, the first pattern PT1 and the second pattern PT2 are arranged on the pattern layer 200 at a constant interval a. Therefore, at least a part of the light incident on the pattern layer 200 may be constructively interfered by the first pattern PT1 and the second pattern PT2.

[0128] The first pattern PT1 forms a plurality of first columns on the pattern layer 200. The second pattern PT2 provides a plurality of second columns. The first columns may be parallel to the second columns. The first columns and the second columns are alternately arranged. A first pattern PT1 of a first column may form a row with a second pattern PT2 of each of the second columns adjacent to each other, and the row may be perpendicular to the first columns and the second columns in a plane. According to the present embodiment, a virtual line connecting the centers of each of the first patterns PT1 to the centers of each of the second patterns PT2 may be parallel to the direction of the row.

[0129] That is, the diffraction pattern DFP may be formed on the pattern layer 200 to form a plurality of rows perpendicular to the first columns and the second columns, and each of the rows may have a form in which the first pattern PT1 and the second pattern PT2 are alternately arranged.

[0130] However, this is merely an example of the arrangement relationship between the first pattern PT1 and the second pattern PT2. According to another embodiment of the present inventive concept, the first pattern PT1 and the second pattern PT2 may be arranged in various shapes. For example, according to another embodiment of the present inventive concept, a plurality of first groups including a plurality of first columns may be alternately arranged with a plurality of second groups including a plurality of columns.

[0131] Similarly, the diffraction pattern DFP' arranged on the second region AR2 includes a first pattern PT1' and a second pattern PT2'. Each of the first patterns PT1' has a first error width b1', and each of the second patterns PT2' has a second error width b2'. For example, the second error width b2' may be greater than the second width b2. The first pattern PT1' and the second pattern PT2' have a constant interval a1.

[0132] According to an embodiment of the present inventive concept, the pattern layer 200 may include a plurality of diffraction patterns DFP having different widths b1 and b2 from each other. Therefore, in the process of forming the diffraction pattern DFP, even if the diffraction patterns DFP have different widths from each other due to process errors, the phenomenon that the brightness or the SDE index is perceived differently can be reduced.

[0133] For example, referring to Figure 11 , a first region AR1 in which a first pattern PT1 having a first width b1 and a second pattern PT2 having a second width b2 are arranged may have values x1 and x2 on the x-axis and luminance values y1 and y2 on the y-axis.

[0134] A second region AR2 in which a first pattern PT1' having a first error width b1' and a second pattern PT2' having a second error width b2' are arranged may have values x1' and x2' on the x-axis and luminance values y1' and y2' on the y-axis.

[0135] According to the present embodiment, the first luminance difference dy1 generated between the first region AR1 and the second region AR2 by the first patterns PT1 and PT1' may be y1 - y1', and the second luminance difference dy2 generated between the first region AR1 and the second region AR2 by the second patterns PT2 and PT2' may be y2 - y2'. In this example, the second luminance difference dy2 is the same as the first luminance difference dy1 and has a sign (e.g., positive or negative) different from that of the first luminance difference dy1. That is, the second width b2 of the second pattern PT2 may be set such that the change rate of the values of y2 and y2' has a negative value when multiplied by the change rate of the values of y1 and y1'. According to the present embodiment, in Figure 11 the graph of, the x2 value representing the second width b2 may be set such that the y2 value is the same as the y1' value and the y2' value is the same as the y1 value. In the above example, the second luminance difference dy2 has a positive value.

[0136] As described above, since the diffraction pattern DFP includes the first pattern PT1 and the second pattern PT2 having different widths b1 and b2, even if the first luminance difference dy1 is generated due to a process error in the process of forming the first pattern PT1, the second luminance difference dy2 generated by the process of forming the second pattern PT2 can compensate for the first luminance difference dy1. That is, since each of the first pattern PT1 and the second pattern PT2 may vary in width due to a process error, the phenomenon of display quality deterioration can be reduced.

[0137] Referring to Figure 11 the luminance A in, although the luminance difference compensation according to the inventive concept is shown, the SDE index B can also be compensated (e.g., equally compensated). For example, since the diffraction pattern DFP includes the first pattern PT1 and the second pattern PT2 having different widths b1 and b2, even if an SDE index difference is generated due to a process error in the process of forming the first pattern PT1, this error can be compensated by the SDE index difference generated in the process of forming the second pattern PT2.

[0138] Figure 12A and Figure 12B are plan views of a pattern layer according to another embodiment of the inventive concept, and Figure 13 is a graph showing the relationship between the luminance of a display device and the SDE index of each of the patterns according to Figure 12A and Figure 12B showing the widths of the patterns.

[0139] For convenience of description, differences between the present embodiment and the foregoing embodiments will be mainly described, and descriptions of what has been omitted may be derived from the foregoing embodiments. Also, the same reference numerals have been given to the same components, and repeated descriptions of components described previously may be omitted.

[0140] Referring to Figure 12A , Figure 12B and Figure 13 , according to another embodiment of the inventive concept, the second pattern PT2 of the diffraction pattern DFP-1 has a width smaller than the width of each of the first patterns PT1. For example, each of the first patterns PT1 has a first width b1, and each of the second patterns PT2 has a second width b2. The second width b2 has a value smaller than the value of the first width b1.

[0141] In Figure 13 the graph depicted, the value of y1 - y1' indicating the first luminance difference dy1 has a negative value, and the value of y2 - y2' indicating the second luminance difference dy2 has a positive value. Figure 13 The values of x2 and x2' in Figure 11 are smaller than the values of x2 and x2' in

[0142] Figure 14 is a plan view of a pattern layer according to another embodiment of the inventive concept.

[0143] For convenience of description, differences between the present embodiment and the foregoing embodiments will be mainly described, and descriptions of what has been omitted may be derived from the foregoing embodiments. The same reference numerals have been given to the same components, and repeated descriptions of the same components may be omitted.

[0144] Referring to Figure 14 , the diffraction pattern DFP-2 according to another embodiment of the inventive concept includes a first pattern PT1 and a second pattern PT2. The first pattern PT1 forms a plurality of first columns. The second pattern PT2 forms a plurality of second columns. The first columns may be parallel to the second columns. The first columns and the second columns are alternately arranged.

[0145] The first pattern PT1 forms a plurality of first rows. The second pattern PT2 forms a plurality of second rows. The first rows may be parallel to the second rows. The first rows and the second rows are alternately arranged. According to the present embodiment, a virtual line connecting the center of each of the first patterns PT1 to the center of each of the second patterns PT2 may not be parallel to the direction of the rows (e.g., may be along a diagonal direction).

[0146] According to the present embodiment, the replication area PRA defined on the display surface IS (e.g., referring to Figure 7 ) may be changed in position (e.g., referring to Figure 7)。For example, the emission region PXA (e.g., see Figure 7 ) and the replication region PRA (e.g., see Figure 7 ) may have a hexagonal arrangement shape. For example, a plurality of replication regions PRA defined around (e.g., surrounding) an emission region PXA may be arranged in a hexagonal shape.

[0147] Figure 15 is a plan view of a pattern layer according to another embodiment of the inventive concept.

[0148] For convenience of description, the differences between the present embodiment and the foregoing embodiment will be mainly described, and the omitted description can be derived from the foregoing embodiment. The same reference numerals are given to the same components, and the repeated description of the previously described components can be omitted.

[0149] Referring to Figure 15 , the diffraction pattern DFP-3 according to another embodiment of the inventive concept further includes a third pattern PT3. Each of the third patterns PT3 has a third width b3. The third width b3 may be less than the first width b1.

[0150] The first pattern PT1 to the third pattern PT3 are alternately arranged on the pattern layer 200-3. The first pattern PT1 and the second pattern PT2 are spaced apart by an interval (e.g., a constant interval) a1.

[0151] In the present embodiment, the third width b3 may be less than the first width b1. In another embodiment, the third width b3 may be greater than the second width b2.

[0152] Figure 16 is a plan view of a pattern layer according to another embodiment of the inventive concept.

[0153] For convenience of description, the differences between the present embodiment and the foregoing embodiment will be mainly described, and the omitted description can be derived from the foregoing embodiment. The same reference numerals may be given to the same components, and the repeated description of the previously described components can be omitted.

[0154] Referring to Figure 16 , the diffraction pattern DFP-4 according to another embodiment of the inventive concept is arranged in a plurality of rows and columns on the pattern layer 200-4. Each of the plurality of columns has a shape in which the first pattern PT1 and the second pattern PT2 are alternately arranged. Each of the plurality of rows has a shape in which the first pattern PT1 and the second pattern PT2 are alternately arranged. According to the present embodiment, a virtual line connecting the centers of each of the first patterns PT1 to the centers of each of the second patterns PT2 may be parallel to the row or column direction.

[0155] Figure 17 is a plan view of a pattern layer according to another embodiment of the inventive concept.

[0156] For convenience of description, differences between this embodiment and the foregoing embodiments will be mainly described, and descriptions of what is omitted may be derived from the foregoing embodiments. The same reference numerals may be given to the same components, and repeated descriptions of components described previously may be omitted.

[0157] Referring to Figure 17 , each of the diffraction patterns DFP-5 according to another embodiment of the inventive concept may have a hexagonal shape. However, the shape of each of the diffraction patterns DFP-5 is merely an example. According to another embodiment of the inventive concept, each of the diffraction patterns DFP-5 may have a polygonal shape such as a triangle and a rectangle or a hybrid shape of a plurality of shapes.

[0158] Figure 18 is an enlarged perspective view showing a part of a region of a display module according to another embodiment of the inventive concept.

[0159] For convenience of description, differences between this embodiment and the foregoing embodiments will be mainly described, and descriptions of what is omitted may be derived from the foregoing embodiments. The same reference numerals may be given to the same components, and repeated descriptions of components described previously may be omitted.

[0160] Referring to Figure 18 , a display module DM-6 according to another embodiment of the inventive concept includes a plurality of diffraction patterns DFP-6. The diffraction patterns DFP-6 are arranged in a matrix having a plurality of rows and columns in a first direction DR1 and a second direction DR2 on a pattern layer 200-6. The diffraction patterns DFP-6 are arranged at intervals (e.g., constant intervals).

[0161] According to this embodiment, each of the diffraction patterns DFP-6 has a shape protruding upward from the top surface of the encapsulation layer EN. That is, each of the diffraction patterns DFP-6 has a protruding (e.g., embossed or engraved) shape. The diffraction patterns DFP-6 define the above-described pattern layer 200-6. Each of the diffraction patterns DFP-6 may include the same material as the encapsulation layer EN. According to another embodiment of the inventive concept, the diffraction patterns DFP-6 may be integrated with the encapsulation layer EN.

[0162] Although not shown in the drawings, a pattern layer 200-6 according to another embodiment of the inventive concept may further include a cover layer CVL disposed on the diffraction patterns DFP-6. The cover layer CVL covers the diffraction patterns DFP-6. In this embodiment, the cover layer CVL may perform a planarization function.

[0163] According to an embodiment of the inventive concept, the display quality of a display device may be improved. In particular, the brightness uniformity may be improved.

[0164] It will be apparent to those skilled in the art that various modifications and variations can be made in the inventive concept. Accordingly, the present disclosure is intended to cover modifications and variations of the present invention as long as they fall within the scope of the appended claims and their equivalents. Thus, to the fullest extent permitted by law, the scope of the present invention is determined by the broadest reasonable interpretation of the appended claims and their equivalents and shall not be restricted or limited by the foregoing detailed description.

Claims

1. Display device, comprising: A display module configured to define a display surface on a plane, the display module comprising: A display panel including a plurality of display elements configured to display an image on the display surface; and A pattern layer including a plurality of diffraction patterns arranged at intervals on the display panel, wherein the pattern layer is configured to diffract at least a part of incident light, wherein the plurality of diffraction patterns include: A first pattern, each of which has a first width; and A second pattern, each of which has a second width greater than the first width, and the first pattern and the second pattern have a constant interval, wherein light emitted from each of the plurality of display elements includes a first sub-light incident on the first pattern and a second sub-light incident on the second pattern, and the optical path difference between the first sub-light and the second sub-light is proportional to the wavelength of the light, and the first sub-light and the second sub-light interfere constructively.

2. The display device according to claim 1, wherein, At least a part of the incident light diffracted by the plurality of diffraction patterns is interfered constructively.

3. The display device according to claim 2, wherein, Each of the plurality of display elements is configured to display a pixel unit image on the display surface, the incident light that interferes constructively displays a replicated pixel unit image between adjacent display elements, and the image is defined by the pixel unit image and the replicated pixel unit image.

4. The display device according to claim 1, wherein, The plurality of diffraction patterns have a plurality of hole shapes passing through the pattern layer.

5. The display device according to claim 1, wherein, The ratio of the number of the second patterns to the number of the first patterns on the pattern layer is in the range of 20% to 80%.

6. The display device according to claim 1, wherein, The number of the first patterns is the same as the number of the second patterns on the pattern layer.

7. The display device according to claim 1, wherein, The ratio of the width of each of the plurality of diffraction patterns to the interval of the plurality of diffraction patterns is in the range of 5% to 95%.

8. The display device according to claim 1, wherein, The plurality of diffraction patterns further include: A third pattern, each of which has a third width smaller than the first width.

9. The display device according to claim 1, wherein, The first patterns form a plurality of first columns on the plane, The second patterns form a plurality of second columns on the plane, and the first columns and the second columns are arranged alternately.

10. The display device according to claim 1, wherein The first patterns and the second patterns are arranged alternately in a first direction and a second direction perpendicular to the first direction on the plane.

11. The display device according to claim 1, wherein, The display panel includes: A base layer; A circuit layer on the base layer and including the plurality of display elements; and A packaging layer on the circuit layer and having the same refractive index as the pattern layer.

12. The display device according to claim 11, wherein, The packaging layer includes the same material as the pattern layer.

13. The display device according to claim 1, wherein Each of the plurality of diffraction patterns has a shape protruding upward from the top surface of the display module.

Images