Display device

Abstract

A display device is provided. The display device includes a display module having a display surface. The display module includes a display panel, a plurality of condensing lenses, a buffer layer, and a plurality of diffraction patterns, wherein the display panel includes a plurality of display devices that display images on the display surface; the plurality of condensing lenses are arranged on the display panel; the buffer layer is provided on the condensing lenses; and the plurality of diffraction patterns are arranged on the buffer layer at regular intervals, wherein the diffraction patterns diffract a portion of light incident thereto.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and all benefits derived from Korean Patent Application No. 10-2018-0084195, filed on Jul. 19, 2018, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The disclosure herein relates to a display device, and more particularly, to a slim display device with improved display quality. Background Art

[0004] With the development of multimedia, display devices are becoming more and more important. For such multimedia, various types of display devices are used, such as a liquid crystal display (LCD), an organic light emitting display (OLED), etc.

[0005] Liquid crystal displays, organic light emitting displays, etc. may be applied to head-mounted display devices. The head-mounted display device may be worn on the user's head and may have the shape of glasses, a helmet, etc. The head-mounted display device may display an image in front of the user's eyes so that the user can recognize the image. Summary of the invention

[0006] The present disclosure provides a slim display device with high display quality.

[0007] An embodiment of the present invention provides a display device, which includes a display module, and the display module defines a display surface in its surface. In this embodiment, the display module includes: a display panel, including a plurality of display devices that display images on the display surface; a plurality of condensing lenses arranged on the display panel; a buffer layer provided on the condensing lenses; and a plurality of diffraction patterns arranged at regular intervals on the buffer layer, wherein the diffraction patterns diffract light incident thereon.

[0008] In embodiments, portions of light diffracted by the diffraction pattern may constructively interfere with each other.

[0009] In an embodiment, the display device may display pixel unit images on a display surface respectively, portions of light constructively interfering with each other may display replicated unit images on the display surface, an image may be defined by the pixel unit images and the replicated unit images, and each of the replicated unit images may be displayed between adjacent pixel unit images on the display surface.

[0010] In an embodiment, each of the display devices may include an organic light emitting device.

[0011] In an embodiment, the display panel may further include a protective layer covering the organic light emitting device.

[0012] In an implementation, each of the condensing lenses may be directly disposed on an upper surface of the display device to cover the display device.

[0013] In an embodiment, a distance from an upper surface of the organic light emitting device to an upper surface of the buffer layer may be defined as an optical distance, and the optical distance may be in a range of about 50 micrometers (μm) to about 150 μm.

[0014] In an embodiment, the replica unit image may be displayed by red light.

[0015] In an embodiment, one of the adjacent pixel unit images may be displayed by red light, and the other of the adjacent pixel unit images may be displayed by blue light.

[0016] In an embodiment, on the display surface, a distance between a center of one of the pixel unit images adjacent to the copy unit image and a center of the copy unit image may be about 25 μm or less.

[0017] In an embodiment, a plurality of replication unit images may be displayed between adjacent pixel unit images on a display surface, and the plurality of replication unit images may include: a first replication unit image, disposed on the display surface adjacent to one of the adjacent pixel unit images; and a second replication unit image, facing the one pixel unit image, with the first replication unit image being located between the second replication unit image and the one pixel unit image.

[0018] In an embodiment, an interval between the diffraction patterns may be in a range of about 4.5 μm to about 7.5 μm.

[0019] In an implementation, a radius of curvature of each of the condensing lenses may be in a range of about 7 μm to about 14 μm.

[0020] In an embodiment, the refractive index of the buffer layer may be lower than the refractive index of each of the condensing lenses.

[0021] In an embodiment, the refractive index of the diffraction pattern may be the same as the refractive index of the buffer layer.

[0022] In an embodiment, the display device may further include a sub-buffer layer disposed between the condensing lens and the display panel.

[0023] In an embodiment, each of the display devices may include a liquid crystal capacitor, and the liquid crystal capacitor may include: a pixel electrode corresponding to a pixel unit image; a common electrode disposed on the pixel electrode; and a liquid crystal layer interposed between the pixel electrode and the common electrode.

[0024] In an embodiment, the display device may further include an input sensing layer disposed on the display module, the input sensing layer including a plurality of input sensing electrodes.

[0025] In an embodiment, the display device may further include: an anti-reflection layer disposed on the display module, wherein the anti-reflection layer may include: a phase retardation layer that delays a component of incident light; and a polarization layer disposed on the phase retardation layer.

[0026] In embodiments, the diffraction pattern may be in the form of a matrix.

[0027] In embodiments, the diffraction pattern may be in the form of stripes.

[0028] In an embodiment, an area occupied by each of the condensing lenses in a plan view may be greater than an area occupied by each of the display devices in a plan view.

[0029] In an embodiment, the display module may further include a cover layer covering the diffraction pattern.

[0030] In an embodiment, the display device may further include: an optical system disposed in a path of light emitted from the display module to magnify an image displayed on a display surface, wherein the display surface may include a left-eye image display area and a right-eye image display area.

[0031] In an embodiment of the present invention, a display device includes a display module, which defines a display surface in its surface, and the display surface includes a plurality of light-emitting areas and a plurality of replication areas. In this embodiment, the display module includes: a display panel that displays an image in each of the light-emitting areas; a plurality of condenser lenses arranged between the display panel and the display surface, wherein the condenser lenses change the direction of light incident thereto to a direction that forms a smaller angle with respect to a direction perpendicular to the display surface; a buffer layer disposed between the condenser lenses and the display surface; and a plurality of diffraction patterns arranged between the buffer layer and the display surface and arranged on the buffer layer at regular intervals, wherein the diffraction patterns diffract the light incident thereto to display an image in each of the replication areas. In this embodiment, the replication area is arranged on the display surface around one of the light-emitting areas.

[0032] In an embodiment of the present invention, a display device includes: a display module defining a display surface including a right-eye display area and a left-eye display area, wherein the display module emits light; and an optical system including a lens disposed in a path of light emitted from the display module to magnify an image displayed by the light. In this embodiment, the display module includes: a display panel including a plurality of pixels displaying an image in each of the right-eye display area and the left-eye display area; a plurality of condensing lenses arranged on the display panel; a buffer layer disposed on the condensing lenses; and a plurality of diffraction patterns arranged on the buffer layer at regular intervals, wherein the diffraction pattern diffracts a portion of the light incident thereon. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] These and / or other features of the present invention will become apparent and more readily understood through the following description of exemplary embodiments in conjunction with the accompanying drawings, in which:

[0034] Figure 1 is a perspective view of a display device according to an embodiment of the present invention;

[0035] Figure 2 It is along Figure 1 A cross-sectional view of the display device taken along line II';

[0036] Figure 3 yes Figure 2 An enlarged cross-sectional view of a display panel shown in FIG.

[0037] Figure 4 yes Figure 2 An exploded perspective view of a display module shown in FIG.

[0038] Figure 5 yes Figure 4 The equivalent circuit of the pixel shown in FIG.

[0039] Figure 6 yes Figure 4 An enlarged cross-sectional view of a display module shown in FIG.

[0040] Figure 7 is a plan view showing a diffraction pattern according to an embodiment of the present invention;

[0041] Figure 8 is a diagram schematically showing a light path of light generated by an organic light emitting device according to an embodiment of the present invention;

[0042] Fig. 9 It is schematically shown Figure 8 A diagram of the diffraction of the second light shown in ;

[0043] Fig.10 is a main view of a replica unit image displayed on a display surface by diffracted light;

[0044] Fig.11 is a diagram schematically showing a light path of light for forming a copy unit image as a comparative example;

[0045] Fig.12 is a front view of a display panel according to an alternative embodiment of the present invention;

[0046] Fig.13 Is set in Fig.12 A front view of a light-collecting layer on a display panel shown in ;

[0047] Fig.14 is through Fig.12 A main view of a replica unit image displayed on a display surface by light generated by the display panel shown in FIG.

[0048] Fig.15 is a cross-sectional view of a display module according to another embodiment of the present invention;

[0049] Fig.16 is a cross-sectional view of a display module according to another embodiment of the present invention;

[0050] Fig.17 is a front view of a display surface on which a replica unit image is displayed according to another alternative embodiment of the present invention;

[0051] Fig.18 is a cross-sectional view of a display module according to another embodiment of the present invention;

[0052] Fig.19 is a plan view showing a diffraction pattern according to another alternative embodiment of the present invention;

[0053] Fig. 20 is a perspective view of a display device according to another alternative embodiment of the present invention;

[0054] Fig.21 It is shown Fig. 20 A diagram showing a display device in a usage environment; and

[0055] Fig. 22 yes Fig. 20 A schematic cross-sectional view of a display device shown in FIG. DETAILED DESCRIPTION

[0056] The present invention will now be more fully described below with reference to the accompanying drawings in which various embodiments are shown. However, the present invention may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the scope of the present invention to those skilled in the art.

[0057] It should be understood that when an element (or region, layer, part, etc.) is referred to as being on, connected to, or coupled to another element, the element may be directly on or directly connected / coupled to the other element, or a third element may exist between them. Conversely, when an element is referred to as being directly on, directly connected to, or directly coupled to another element, there is no intervening element.

[0058] Throughout the entire text, the same reference numerals denote the same elements. In the drawings, the thickness, proportion and size of elements are exaggerated for clarity of illustration.

[0059] The terms used herein are only used for the purpose of describing specific embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, as used herein, the singular forms "one", "an" and "said" are intended to include plural forms, including "at least one". "Or" means "and / or". "At least A and B" means "A and / or B". As used herein, the term "and / or" includes any and all combinations of one or more of the related listed items. It should also be understood that when used in this specification, the terms "comprises" and / or "comprising" or "includes" and / or "including" indicate the presence of the features, regions, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, components and / or groups thereof.

[0060] The terms "first", "second", etc. may be used to describe various elements, but these elements should not be interpreted as being limited by the terms. These terms are only used to distinguish one element from other elements. For example, without departing from the teachings of the present disclosure, a first element may be referred to as a second element, and conversely, a second element may be referred to as a first element. Unless otherwise stated, terms in the singular may include plural forms.

[0061] In addition, the terms “below”, “lower side”, “upper”, “upper side” and the like are used to describe the association relationship between elements shown in the drawings. The terms as relative concepts are used based on the directions shown in the drawings.

[0062] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meanings as those understood by those skilled in the art. Common terms, such as those defined in commonly used dictionaries, should be interpreted as matching the meanings in the relevant field in the context, and should not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0063] It should also be understood that when used in this specification, the terms “include,” “including,” “has,” “having,” etc. indicate the presence of stated features, quantities, steps, operations, elements, components, or a combination thereof, but do not exclude the presence or addition of one or more other features, quantities, steps, operations, elements, components, or a combination thereof.

[0064] As used herein, "about" or "approximately" is inclusive of the stated value and means within an acceptable range of deviation from the particular value as determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).

[0065] Exemplary embodiments are described herein with reference to cross-sectional views as schematic diagrams of idealized embodiments. Therefore, variations in the illustrated shapes due to, for example, manufacturing techniques and / or tolerances are anticipated. Therefore, the embodiments described herein should not be construed as limited to specific regional shapes as shown herein, but rather include shape deviations, for example, caused by manufacturing. For example, a region shown or described as flat may typically have rough and / or nonlinear features. In addition, sharp angles shown may be rounded. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to illustrate the precise shape of the region, and are not intended to limit the scope of the claims.

[0066] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0067] Figure 1 is a perspective view of a display device according to an embodiment of the present invention, and Figure 2 It is along Figure 1 A cross-sectional view of the display device taken along line II'.

[0068] refer to Figure 1 and Figure 2 , the display device 1000 according to the embodiment 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. However, for the convenience of description, the shape of the above-mentioned display device 1000 is merely exemplary, and the shape of the display device 1000 is not particularly limited.

[0069] In an embodiment, the display device 1000 defines a display surface IS including 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 may be defined in a central area of ​​the display device 1000. In this embodiment, the display area DA may display an image IMG, and the non-display area NDA has a frame shape surrounding the display area DA on a plane. The non-display area NDA does not display an image. The shape of the display area DA and the non-display area NDA is not particularly limited.

[0070] Herein, the normal direction of the display surface IS (i.e., the direction in which the image IMG is displayed) is defined as a third direction DR3. The front surface (or top surface) and the rear surface (or bottom surface) of each member can be distinguished by the third direction DR3. However, the directions indicated by the first direction DR1 to the third direction DR3 are relative directions and thus can be changed to other directions.

[0071] The display device 1000 includes a display module DM. In an embodiment, a display surface IS may be defined on a top surface of the display module DM. The display module DM includes a display panel 100 and an optical member 200 disposed on the display panel 100, and the display panel 100 includes a plurality of display devices (not shown) for displaying an image. Figures 3 to 11 The display panel 100 and the optical member 200 are described in more detail.

[0072] In an embodiment, if Figure 2 As shown in , the display device 1000 may further include an input sensing layer 300 , an anti-reflection (or anti-reflection) layer 400 , and a window member 500 .

[0073] 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 (eg, a touch on the display device 1000).

[0074] In an embodiment, the input sensing layer 300 may sense an external input inputted through a part of the user's body. In an embodiment of the present invention, the external input is not limited to a specific type. According to an embodiment of the present invention, the external input may be an input performed optically, contact-wise, or magnetically.

[0075] Although not shown in the drawings, the input sensing layer 300 may include a plurality of input sensing electrodes (not shown) for sensing an external input.

[0076] The input sensing layer 300 may sense the external input using at least one of a variety of methods. In an embodiment, the input sensing layer 300 may be driven in a capacitive manner, a resistive manner, or a coordinate recognition manner.

[0077] The anti-reflection layer 400 is disposed on the input sensing layer 300. The anti-reflection layer 400 is disposed to overlap with the display area DA of the display module DM in a plan view or when viewed from a plan view in the third direction DR3. The anti-reflection layer 400 effectively prevents external light incident to the display device 1000 from being reflected by the display module DM and observed by the user. Although not shown in the drawings, the anti-reflection layer 400 may include a polarizing layer (not shown) and a phase delay layer (not shown).

[0078] In an embodiment, the polarizing layer (not shown) has a transmission axis and an absorption axis perpendicular to the transmission axis. One of the components of external light incident on the polarizing layer (not shown) is absorbed by the absorption axis or reflected and thus cannot pass through the polarizing layer (not shown), but a component perpendicular to the one of the components of external light incident on the polarizing layer (not shown) passes through the polarizing layer (not shown). In this embodiment, the polarizing layer (not shown) linearly polarizes the external light.

[0079] In an embodiment, the polarizing layer (not shown) may include or consist of a polymer resin stretched in a specific direction. However, the type of the polarizing layer (not shown) of an embodiment of the present invention is not limited thereto. In an alternative embodiment of the present invention, the polarizing layer (not shown) may be a wire grid polarizer.

[0080] The phase retarder layer (not shown) is disposed below the polarization layer (not shown). The phase retarder layer (not shown) has optical anisotropy. Therefore, the phase retarder layer (not shown) can delay the phase of one component of the light. That is, the phase retarder layer (not shown) is used to change the polarization state of the light. In an embodiment, the phase retarder layer (not shown) can delay one component of the light by λ / 4. In this embodiment, the phase retarder layer (not shown) can be a quarter-wavelength film. Therefore, the phase of one component of the light passing through the phase retarder layer (not shown) can be delayed, so that the light can be changed from a linear polarization state to a circular polarization state, or from a circular polarization state to a linear polarization state.

[0081] According to an embodiment, even if external light incident to the display device 1000 is reflected by the display module DM, since the polarization state is changed by the phase retardation layer (not shown), the light may be absorbed or reflected by the polarization layer (not shown). In this embodiment, the external light reflected by the display module DM may not be seen from outside the display device 1000.

[0082] In an embodiment, the window member 500 is disposed on the anti-reflection layer 400. The window member 500 provides the front surface of the display device 1000 and protects the anti-reflection layer 400, the input sensing layer 300 and the display module DM. In an embodiment, for example, the window member 500 may include a glass substrate, a sapphire substrate or a plastic film. The window member 500 may have a single-layer structure or a multi-layer structure. In an embodiment, for example, the window member 500 may have a structure in which a plurality of plastic films bonded by an adhesive are stacked or a structure in which an organic substrate and a plastic film bonded by an adhesive are stacked.

[0083] In an embodiment, the display device 1000 may further include a plurality of adhesive members AD1 and AD2. The first adhesive member AD1 is disposed between the input sensing layer 300 and the anti-reflection layer 400 to bond the input sensing layer 300 and the anti-reflection layer 400 to each other. The second adhesive member AD2 is disposed between the anti-reflection layer 400 and the window member 500 to bond the anti-reflection layer 400 and the window member 500 to each other.

[0084] In alternative embodiments of the present invention, the input sensing layer 300, the anti-reflection layer 400, or the window member 500 may be omitted.

[0085] Figure 3 yes Figure 2 An enlarged cross-sectional view of a display panel is shown in FIG. Figure 3 Can be along Figure 1 1 is a cross-sectional view of the display panel 100 taken along line II-II′.

[0086] Figure 4 yes Figure 2 Exploded perspective view of the display module shown in FIG.

[0087] For ease of description, Figure 4 Show Figure 2 1 is an enlarged view of a portion of the display panel 100 and the optical member 200 corresponding to the display area DA shown in FIG.

[0088] refer to Figure 3 and Figure 4 According to the embodiment, the display panel 100 may be an organic light emitting display panel. In this embodiment, the display device included in the display panel 100 may be an organic light emitting device (OLED).

[0089] In this embodiment, if Figure 3 As shown in FIG. 1 , the display panel 100 includes a base layer BSL, a circuit layer CRL, a pixel layer PXL, and a protective layer PTL. The base layer BSL defines a rear surface of the display panel 100. The circuit layer CRL is disposed on the base layer BSL. The circuit layer CRL may include a plurality of organic light emitting devices OLED ( Figure 5and Figure 6 ) of multiple thin film transistors (not shown) and multiple signal wirings (not shown).

[0090] The pixel layer PXL is disposed on the circuit layer CRL. The pixel layer PXL includes a plurality of organic light emitting devices OLED ( Figure 5 and Figure 6 ) and the organic light emitting device OLED ( Figure 5 and Figure 6 ) is separated by a pixel definition layer PDL. An organic light emitting device OLED ( Figure 5 and Figure 6 ) and connected to an organic light emitting device OLED ( Figure 5 and Figure 6 ) may define one pixel PX. In this embodiment, the display panel 100 includes a plurality of pixels PX.

[0091] According to an embodiment of the present invention, the type of the display panel 100 may be determined according to the configuration of the pixel layer PXL. The display panel 100 may be an organic light emitting display panel, a liquid crystal display panel, an electrophoretic display panel, or an electrowetting display panel, or any one of various display panels for displaying images. In an embodiment, the display panel 100 may be modified differently without being limited to one embodiment. In the drawings described below (except Fig.18 In the figure, for the convenience of illustration and description, an embodiment in which the display panel 100 is an organic light-emitting display panel is shown.

[0092] In an embodiment, the protection layer PTL is disposed on the pixel layer PXL to cover the pixel layer PXL. The protection layer PTL may be an encapsulation layer for encapsulating the pixel layer PXL. In an embodiment, the protection layer PTL has a first refractive index. In one embodiment, for example, the first refractive index may be in the range of about 1.4 to about 1.6.

[0093] In an embodiment of the present invention, the protection layer PTL may include a plurality of stacked organic films and / or inorganic films. In an embodiment, the protection layer PTL may be a planarization layer for planarizing the upper surface of the pixel layer PXL. The protection layer PTL may be modified in various forms and is not limited to one embodiment.

[0094] Figure 5 yes Figure 4 The equivalent circuit of a pixel is shown in FIG.

[0095] refer to Figure 5, the pixel PX includes a thin film transistor, a capacitor and a display device. In an embodiment, the pixel PX includes a first thin film transistor TFT1, a second thin film transistor TFT2, a single capacitor Cap and an organic light emitting device OLED.

[0096] The first thin film transistor TFT1 includes a control electrode connected to the scan line SL, an input electrode connected to the data line DL, and an output electrode. The first thin film transistor TFT1 outputs a data signal applied thereto through the data line DL in response to a scan signal applied thereto through the scan line SL.

[0097] The capacitor Cap includes a first capacitor electrode connected to the output electrode of the first thin film transistor TFT1 and a second capacitor electrode for receiving the first power voltage ELVDD. The capacitor Cap is charged with charges corresponding to the difference between the first power voltage ELVDD and a voltage corresponding to a data signal received from the first thin film transistor TFT1.

[0098] The second thin film transistor TFT2 includes a control electrode, an input electrode and an output electrode, wherein the control electrode is connected to the output electrode of the first thin film transistor TFT1 and the first capacitor electrode of the capacitor Cap, and the input electrode is used to receive the first power supply voltage ELVDD. The output electrode of the second thin film transistor TFT2 is connected to the organic light emitting device OLED.

[0099] The second thin film transistor TFT2 controls a driving current flowing through the organic light emitting device OLED based on the charge stored in the capacitor Cap. The on-time of the second thin film transistor TFT2 is determined based on the amount of charge stored in the capacitor Cap. The output electrode of the second thin film transistor TFT2 substantially supplies a voltage lower than the first power supply voltage ELVDD to the organic light emitting device OLED.

[0100] The organic light emitting device OLED includes a first electrode connected to an output electrode of the second thin film transistor TFT2 and a second electrode connected to a second power supply voltage ELVSS. The organic light emitting device OLED may include a light emitting pattern or a light emitting layer disposed between the first electrode and the second electrode.

[0101] The organic light emitting device OLED emits light during the on period of the second thin film transistor TFT2. The color of the light generated by the organic light emitting device OLED is determined by the material included in the light emitting pattern or the light emitting layer or the material forming the light emitting pattern or the light emitting layer. In one embodiment, for example, the color of the light generated by the organic light emitting device OLED may be one of red, green, blue, and white. The organic light emitting device OLED generally defines the light emitting area PXA on the display panel 100.

[0102] Return to reference Figure 4 , the optical member 200 includes a light collecting layer CTL, a buffer layer BFL, and a plurality of diffraction patterns DFP.

[0103] The light collecting layer CTL is disposed on the display panel 100. The light collecting layer CTL includes a base layer BS and a plurality of light collecting lenses LNS disposed on the base layer BS. The base layer BS and the plurality of light collecting lenses LNS may be integrally formed with each other as a single unit. According to an embodiment, the light collecting layer CTL has a second refractive index. In one embodiment, for example, the second refractive index may be in the range of about 1.7 to about 1.9.

[0104] The bottom layer BS overlaps with the display area DA of the display module DM. The bottom layer BS may contact the upper surface of the display panel 100. In an embodiment, the bottom layer BS is in contact with the protective layer PTL ( Figure 3 )touch.

[0105] The plurality of condensing lenses LNS are arranged on the upper surface of the base BS. The plurality of condensing lenses LNS have a shape protruding upward or in the third direction DR3 from the upper surface of the base BS.

[0106] In an embodiment, each of the condensing lenses LNS may have a predetermined radius of curvature. In one embodiment, for example, the radius of curvature of each of the condensing lenses LNS may be in a range of about 7 micrometers (μm) to about 14 μm.

[0107] The plurality of condensing lenses LNS are spaced apart from each other. In an embodiment, the condensing lenses LNS are arranged in one-to-one correspondence with the pixels PX arranged in the display panel 100. In an embodiment, each of the condensing lenses LNS may overlap at least a portion of a corresponding pixel in the pixels PX in a plan view or when viewed from a plan view in a third direction DR3. In one embodiment, for example, each of the condensing lenses LNS may be arranged to overlap an organic light emitting device OLED included in a corresponding pixel PX in a plan view.

[0108] The buffer layer BFL is disposed on the light collecting layer CTL to cover the light collecting layer CTL. In an embodiment, the buffer layer BFL has a third refractive index. In one embodiment, for example, the third refractive index may be in a range of about 1.4 to about 1.6. In an embodiment, the buffer layer BFL may include an acrylic material or a siloxane material. The buffer layer BFL may be formed on the light collecting layer CTL by a coating process. However, the material or manufacturing process of the buffer layer BFL of the embodiment of the present invention is not particularly limited.

[0109] The diffraction pattern DFP is arranged on the buffer layer BFL. The diffraction pattern DFP may be arranged in a matrix on the upper surface of the buffer layer BFL. The diffraction pattern DFP is used to diffract at least a portion of the incident light. The diffraction pattern DFP has a third refractive index. In one embodiment, for example, the third refractive index may be in the range of about 1.4 to about 1.6. Figures 7 to 11 The diffraction pattern DFP is described in more detail.

[0110] refer to Figure 2 and Figure 4 In an embodiment, the optical member 200 may further include a cover layer CVL disposed on the diffraction pattern DFP. The cover layer CVL covers the diffraction pattern DFP. In this embodiment, the cover layer CVL may perform a planarization function or may provide a flat surface on the diffraction pattern DFP disposed thereunder.

[0111] Figure 6 yes Figure 4 An enlarged cross-sectional view of a display module is shown in FIG.

[0112] refer to Figure 6 As described above, the pixel layer PXL includes the organic light emitting device OLED and the pixel defining layer PDL.

[0113] The organic light emitting device OLED includes a first electrode EL1, a second electrode EL2 and a light emitting layer OEL. The first electrode EL1 may be a pixel electrode or a positive electrode. The first electrode EL1 may be a semi-transmissive electrode or a reflective electrode. In an embodiment, the first electrode EL1 may include Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr or a combination thereof. Alternatively, the first electrode EL1 may have a multilayer structure including: a reflective film or a semi-transmissive reflective film including the above materials; and a transparent conductive film including indium tin oxide (ITO), indium zinc oxide (IZO), zinc oxide (ZnO), indium tin zinc oxide (ITZO), etc.

[0114] The second electrode EL2 may be a common electrode or a negative electrode. The second electrode EL2 may be a transmissive electrode. In an embodiment, the second electrode EL2 may include Li, Ca, LiF / Ca, LiF / Al, Al, Mg, BaF, Ba, Ag metal or a compound or mixture thereof (e.g., a mixture of Ag and Mg). However, embodiments of the present invention are not limited thereto. In an alternative embodiment, for example, the second electrode EL2 may include ITO, IZO, zinc oxide (ZnO) or ITZO.

[0115] The pixel defining layer PDL may be disposed on the first electrode EL1. In an embodiment, the pixel defining layer PDL may cover a portion of the first electrode EL1 and may expose another portion of the first electrode EL1. The pixel defining layer PDL may include a metal-fluoride ion compound, but embodiments of the present invention are not limited thereto. In an embodiment, for example, the pixel defining layer PDL may include LiF, BaF 2 and any one of metal-fluorine ion compounds in CsF. When the metal-fluorine ion compound has a predetermined thickness, the metal-fluorine ion compound has an insulating property. The light emitting area PXA may be defined by the pixel defining layer PDL. The focusing lens LNS of the focusing layer CTL may overlap with the light emitting area PXA in a plan view.

[0116] The light emitting layer OEL may be disposed between the first electrode EL1 and the second electrode EL2. In an embodiment, the light emitting layer OEL may be disposed in the light emitting area PXA defined by the pixel defining layer PDL.

[0117] According to an embodiment of the present invention, an area occupied by each of the condensing lenses LNS in a plan view may be greater than an area occupied by each organic light emitting device OLED in a plan view. In this embodiment, an area occupied by each of the condensing lenses LNS in a plan view may be greater than an area occupied by each of the light emitting regions PXA.

[0118] In an embodiment, in addition to the light-emitting layer OEL, a plurality of common layers may be disposed between the first electrode EL1 and the second electrode EL2. In this embodiment, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer may be sequentially stacked between the first electrode EL1 and the second electrode EL2. In an embodiment, at least one of a hole blocking layer, a hole buffer layer, and an electron blocking layer may be disposed between the first electrode EL1 and the second electrode EL2.

[0119] Figure 7 is a plan view showing a diffraction pattern according to an embodiment of the present invention.

[0120] refer to Figure 7 , the diffraction pattern DFP is arranged on the buffer layer BFL. Each of the diffraction patterns DFP has a circular shape on a plane defined by the first direction DR1 and the second direction DR2. In one embodiment, for example, the diameters d1 and d2 of each of the diffraction patterns DFP may be in the range of about 2.5 μm to about 5.0 μm. However, the shape and diameter of each of the diffraction patterns DFP of the embodiment of the present invention are not particularly limited.

[0121] The diffraction pattern DFP is arranged in a matrix form having a plurality of rows in a first direction DR1 and a plurality of columns in a second direction DR2. The diffraction pattern DFP is arranged at regular (or constant) intervals PA1 and PA2 in the first direction DR1 and in the second direction DR2. In an embodiment, the diffraction pattern DFP has a first interval PA1 in the first direction DR1 and a second interval PA2 in the second direction DR2. In an embodiment, the first interval PA1 may be the same as the second interval PA2. In one embodiment, for example, each of the first interval PA1 and the second interval PA2 may be in a range of about 4.5 μm to about 7.5 μm.

[0122] In an embodiment, the diffraction pattern DFP may diffract at least a portion of the incident light. In an embodiment, the first interval PA1 and the second interval PA2 may be differently designed according to the wavelength λ of the light to be diffracted by the diffraction pattern DFP. In one embodiment, for example, each of the first interval PA1 and the second interval PA2 may be equal to λ / n×sinθ, where n represents the distance between the diffraction pattern DFP and the cover layer CVL ( Figure 2 ), and θ represents an angle formed by the light incident from the buffer layer BFL to the diffraction pattern DFP relative to the third direction DR3.

[0123] In an alternative embodiment of the present invention, the first interval PA1 may be different from the second interval PA2.

[0124] In the following, reference will be made to Figure 8 and Fig. 9 The diffraction pattern DFP is described in more detail.

[0125] Figure 8 is a diagram schematically showing a light path of light generated by an organic light emitting device according to an embodiment of the present invention, and Fig. 9 It is schematically shown Figure 8 For ease of description, Figure 8 and Fig. 9 Only one cross section of the display module DM taken along a line parallel to the second direction DR2 is shown. However, according to an embodiment of the present invention, the configuration of the display module DM described below has the same configuration as that of the cross section of the display module DM taken along a line parallel to the first direction DR1.

[0126] refer to Figure 8 and Fig. 9In an embodiment, the organic light emitting device OLED generates light. Among the light generated by the organic light emitting device OLED, light propagating upward along a third direction DR3 perpendicular to the display surface IS is defined as first light L1. The first light L1 passes through the protective layer PTL, the light collecting layer CTL, the buffer layer BFL, and the diffraction pattern DFP to display a pixel unit image IM on the display surface IS.

[0127] Light other than the first light L1 generated by the organic light emitting device OLED is defined as side light (not shown). For ease of description, Figure 8 Only the second light L2 is shown, which is defined as light emitted from the organic light emitting device OLED in a direction forming a first angle θ1 with the first light L1.

[0128] The second light L2 passes through the protective layer PTL in a direction forming a first angle θ1 with the first light L1. Due to the difference in refractive index between the protective layer PTL and the light-collecting layer CTL, the second light L2 may be mainly refracted at the interface between the protective layer PTL and the light-collecting layer CTL. In this embodiment, an intermediate refraction angle (not shown) defined as each angle formed by the second light L2 (which is mainly refracted at the interface) relative to the first light L1 is smaller than the first angle θ1.

[0129] Each of the second lights L2 incident on the light collecting layer CTL at the intermediate refraction angle may be twice refracted at the upper surface of the light collecting lens LNS of the light collecting layer CTL. Each of the twice refracted second lights L2 may form a second angle θ2 with the first light L1. The second angle θ2 is smaller than the intermediate refraction angle. In an embodiment, the value of the second angle θ2 may vary according to the shape of the upper surface of the light collecting lens LNS.

[0130] The second light L2 refracted at the second angle θ2 is incident on the buffer layer BFL. The second light L2 is incident on the diffraction pattern DFP after passing through the buffer layer BFL, and the incident second light L2 may be diffracted by the diffraction pattern DFP.

[0131] According to an embodiment of the present invention, the diffraction pattern DFP having regular intervals PA1 and PA2 may diffract the first light L1 in the incident light and the second light L2 incident at the second angle θ2 to display the replica unit image IM' on the display surface IS. In this embodiment, the second light L2 may be incident on the diffraction pattern DFP at the second angle θ2 to display the replica unit image IM'.

[0132] According to an embodiment, second light L2 emitted from the organic light emitting device OLED at a first angle θ1 relative to the first light L1 is transmitted and refracted by the intermediate member and is incident on the diffraction pattern DFP at a second angle θ2 relative to the first light L1. In an embodiment, the intermediate member includes a protective layer PTL, a light collecting layer CTL, and a buffer layer BFL.

[0133] In an embodiment, a distance from an upper surface of the organic light emitting device OLED to an upper surface of the buffer layer BFL on which the diffraction pattern DFP is disposed may be defined as an optical distance Z. In this embodiment, the optical distance Z may be in the range of about 50 μm to about 150 μm.

[0134] In an embodiment, as described above, the diffraction pattern DFP diffracts the second light L2 to display the replica unit image IM' on the display surface IS.

[0135] In this embodiment, the second light L2 includes a first sub-light L21 and a second sub-light L22. The first sub-light L21 and the second sub-light L22, which form a second angle θ2 relative to the first light L1, are incident on different diffraction patterns DFP. An optical path difference may be generated between the first sub-light L21 and the second sub-light L22, wherein the optical path difference is defined as a first distance.

[0136] According to an embodiment, since the first sub-light L21 and the second sub-light L22 are diffracted by the diffraction pattern DFP, the first sub-light L21 and the second sub-light L22 may undergo constructive interference with each other. In this embodiment, a phase difference may be generated between the first sub-light L21 and the second sub-light L22, wherein the phase difference may be the same as the wavelength λ of the second light L2. Therefore, the first distance is proportional to the wavelength λ of the second light L2. The first sub-light L21 and the second sub-light L22 that have undergone constructive interference with each other display a replica unit image IM' on the display surface IS.

[0137] Fig.10 It is the main view of the replica unit image displayed on the display surface by diffracted light. For the convenience of description, Fig.10 Only one light emitting area PXA among the plurality of light emitting areas PXA is shown.

[0138] refer to Fig.10 In an embodiment, the display surface IS includes a plurality of light emitting areas PXA and a plurality of replication areas PRA. The plurality of replication areas PRA are arranged around one light emitting area PXA. In this embodiment, the replication areas PRA may be defined at opposite sides of one light emitting area PXA in the first direction DR1 and at other opposite sides of the light emitting area PXA in the second direction DR2. The shape of each of the light emitting areas PXA may be the same as the shape of each of the replication areas PRA. Fig.10The light emitting area PXA and the replication area PRA are illustrated as having a rhombus shape, but embodiments of the present invention are not limited thereto.

[0139] The light emitting area PXA and the replication area PRA are spaced apart from each other. The interval between one light emitting area PXA and one replication area PRA adjacent thereto is defined as a replication interval PP. In one embodiment, for example, the replication interval PP may be about 25 μm or less. The replication interval PP is the distance between the center of one light emitting area PXA and the center of one replication area PRA.

[0140] According to an embodiment, the first light L1 among the light generated by the organic light emitting device OLED passes through the intermediate members PTL, CTL and BFL, and displays the pixel unit image IM in the light emitting area PXA of the display surface IS. The shape of the pixel unit image IM corresponds to the planar shape of the organic light emitting device OLED. In this embodiment, the second light L2 among the light generated by the organic light emitting device OLED passes through the intermediate members PTL, CTL and BFL, and displays the copy unit image IM' in the copy area PRA of the display surface IS. The shape of the copy unit image IM' corresponds to the shape of the pixel unit image IM. The image displayed by the display module DM can be provided to the user in the form of a combination of the pixel unit image IM and the copy unit image IM'.

[0141] According to an embodiment of the present invention, a plurality of unit images IM and IM' can be displayed on a display surface IS using light generated by one organic light emitting device OLED. In this embodiment, a unit image provided by one organic light emitting device OLED can be replicated as a plurality of images. In this embodiment, since a replication area PRA on which independent unit images are displayed is defined in a non-luminous area (not shown) defined between luminous areas PXA on a conventional display surface IS, the non-luminous area (not shown) can be prevented from being observed from the outside. Therefore, in this embodiment, the display quality of the display device 1000 can be improved.

[0142] Fig.11 is a diagram schematically showing a light path of light for forming a copy unit image as a comparative example.

[0143] refer to Fig.11 , unlike the embodiment of the present invention, in a comparative example in which the display module DM does not include the light-condensing layer CTL, that is, when light among the light emitted from the organic light-emitting device OLED is incident on the buffer layer BFL at the second angle θ2 relative to the first light L1 without secondary refraction, an optical distance Z from the upper surface of the organic light-emitting device OLED to the upper surface of the buffer layer BFL on which the diffraction pattern DFP is arranged is PRIn the comparative example where the display module DM does not include the light-collecting layer CTL, the optical distance Z PR It may be at least about 150 μm. PR When it is greater than 150 μm, shrinkage may occur due to heat or moisture, and thus bending pressure may be applied to the display module DM. However, according to an embodiment of the present invention, the second light L2 is twice refracted by the light-condensing layer CTL, and thus the optical distance Z can be reduced. Therefore, according to an embodiment of the present invention, the thickness of the display device 1000 can be reduced, and the durability of the display device 1000 can be improved.

[0144] Fig.12 is a front view of a display panel according to an alternative embodiment of the present invention, and Fig.13 Is set in Fig.12 A front view of the light-collecting layer on the display panel is shown in FIG. Fig.14 is through Fig.12 FIG. 1 is a front view of a display panel generating light and displaying a replica unit image on a display surface.

[0145] For ease of description, the following description focuses on elements different from those in the above-described embodiment. The same or similar elements are identified with the same reference numerals as those used to describe the above-described embodiment, and any repeated detailed description thereof will be omitted or simplified hereinafter.

[0146] refer to Figure 12 to Figure 14 The display panel 100-1 according to the embodiment includes a plurality of pixels (not shown) for emitting different lights in a plan view. Light emitted from the plurality of pixels (not shown) displays a plurality of pixel unit images IM1, IM2, and IM3 on a display surface IS-1 as described below.

[0147] Each of the organic light emitting devices (not shown) included in a plurality of pixels (not shown) defines light emitting regions PXA1, PXA2, and PXA3 on the display panel 100-1.

[0148] In an embodiment, the display panel 100-1 defines a plurality of panel areas AR in a plan view. The plurality of panel areas AR have the same shape and are arranged adjacent to each other. In an embodiment, each of the panel areas AR has a rhombus shape.

[0149] The light-emitting regions PXA1, PXA2, and PXA3 are arranged on the panel region AR. The light-emitting regions PXA1, PXA2, and PXA3 may include a first light-emitting region PXA1, a second light-emitting region PXA2, and a third light-emitting region PXA3, wherein each of the first light-emitting regions PXA1 displays a first pixel unit image IM1, each of the second light-emitting regions PXA2 displays a second pixel unit image IM2, and each of the third light-emitting regions PXA3 displays a third pixel unit image IM3.

[0150] Each of the first light emitting regions PXA1 is defined within a panel area (eg, AR n，m ). The first pixel unit image IM1 displayed in each of the first light emitting regions PXA1 is displayed by the first color light. In one embodiment, for example, the first color light may be red light.

[0151] The second light emitting area PXA2 is defined in parallel with each panel area AR n,m In an embodiment, the second light emitting area PXA2 is defined in an area consisting of four panel areas (eg, AR n,m , AR n,m-1 , AR n+1,m-1 , AR n+1,m ) in a vertex region commonly shared by the first and second light emitting regions PXA1 and PXA2. Therefore, the first light emitting region PXA1 and the second light emitting region PXA2 may be alternately arranged along the first direction DR1 and along the second direction DR2. The second pixel unit image IM2 displayed in each of the second light emitting regions PXA2 is displayed by the second color light. In one embodiment, for example, the second color light may be blue light.

[0152] The third light emitting area PXA3 is defined by a panel area (eg, AR n+1,m ) and the adjacent panel areas (e.g., AR n,m , AR n+1,m-1 , AR n+1,m+1 or AR n+2,m ) is at the center of the side portion commonly shared by the third pixel unit image IM3 displayed in each of the third light emitting areas PXA3 is displayed by the third color light. In one embodiment, for example, the third color light may be green light.

[0153] The light collecting layer CTL-1 is disposed on the display panel 100-1. The bottom layer BS-1 of the light collecting layer CTL-1 covers the front surface of the display panel 100-1. The light collecting lenses LNS are arranged on the bottom layer BS-1. According to an embodiment, the light collecting lenses LNS of the light collecting layer CTL-1 may be arranged one-to-one corresponding to the first light emitting areas PXA1. In this embodiment, as shown in FIG. Fig.13As shown in FIG. 1 , the condenser lens LNS is arranged to overlap with the first light emitting area PXA1 and not overlap with the second light emitting area PXA2 and the third light emitting area PXA3 in a plan view. In this embodiment, each of the condenser lenses LNS is arranged to overlap with the panel area (eg, AR n,m ) overlap in the center of each.

[0154] refer to Fig.14 , as mentioned above, the diffraction pattern DFP( Figure 7 ) diffracts specific light in the incident light to display a replica unit image IM1' on the display surface IS-1. In an embodiment, a plurality of replica regions PRA may be defined in an area adjacent to the first light emitting region PXA1, wherein in the first light emitting region PXA1, the pixel unit image IM1 is displayed on the display surface IS-1 by the first color light. In this embodiment, in the display surface IS-1, each of the replica regions PRA may be defined between the first light emitting region PXA1 and the second light emitting region PXA2 adjacent to each other. In an embodiment, the first replica unit image IM1' displayed by the first color light may be displayed in the replica region PRA.

[0155] However, the embodiments of the present invention are not limited thereto. In an alternative embodiment, for example, the position of the replication area PRA and the color of the replication unit image IM1′ displayed in the replication area PRA may be determined based on the position of the light collecting layer CTL and the diffraction pattern DFP ( Figure 7 )'s arrangement interval varies.

[0156] Fig.15 is a cross-sectional view of a display module according to another alternative embodiment of the present invention.

[0157] For ease of description, the following description focuses on elements different from those in the above-described embodiment. The same or similar elements are identified with the same reference numerals as those used to describe the above-described embodiment, and any repeated detailed description thereof will be omitted or simplified hereinafter.

[0158] refer to Fig.15 In an embodiment, the optical member 200-2 of the display module DM-2 includes a sub-buffer layer BFL2. In this embodiment, the first buffer layer BFL1 has the same structure as the above-mentioned buffer layer BFL ( Figure 2 ) has the same configuration, and any repeated detailed description thereof will be omitted.

[0159] The subbuffer layer BFL2 is disposed between the light collection layer CTL and the protective layer PTL of the display panel 100. The subbuffer layer BFL2 has a fourth refractive index. The fourth refractive index may be lower than the second refractive index. In one embodiment, for example, the fourth refractive index may be in the range of about 1.4 to about 1.6.

[0160] According to an embodiment, the third light L3 among the light emitted from the organic light emitting device OLED forms a third angle θ3 with respect to the first light L1. The third angle θ3 is smaller than the first angle θ1 ( Figure 8 ). Due to the refractive index difference between the protective layer PTL and the sub-buffer layer BFL2, the third light L3 may be refracted at the interface between the protective layer PTL and the sub-buffer layer BFL2. The refracted third light L3 is sequentially refracted at the interface between the sub-buffer layer BFL2 and the light-collecting layer CTL and at the interface between the light-collecting layer CTL and the first buffer layer BFL1, and is incident on the diffraction pattern DFP. The third light L3 forms a second angle θ2 with respect to the first light L1 in the first buffer layer BFL1 on which the diffraction pattern DFP is arranged.

[0161] According to an embodiment, since the sub-buffer layer BFL2 is disposed below the light-collecting layer CTL, the side light may be refracted again compared to the above embodiment. Therefore, the replica unit image IM' may be displayed using light emitted from the organic light-emitting device OLED at a relatively small angle relative to the first light L1 (i.e., light having a relatively small difference in intensity compared to the first light L1 as the front light). That is, according to an embodiment, the intensity of the replica unit image IM' may be increased compared to the above embodiment.

[0162] Fig.16 is a cross-sectional view of a display module according to another embodiment of the present invention.

[0163] For ease of description, the following description focuses on elements different from those in the above-described embodiment. The same or similar elements are identified with the same reference numerals as those used to describe the above-described embodiment, and any repeated detailed description thereof will be omitted or simplified hereinafter.

[0164] refer to Fig.16 , the display panel 100-3 of the display module DM-3 does not include a protective layer PTL ( Figure 8 ). Therefore, the organic light emitting device OLED of the display panel 100 - 3 may be in direct contact with the optical member 200 - 3 .

[0165] In this embodiment, the light collecting layer CTL does not include the bottom layer BS ( Figure 4 ). Therefore, the condensing lens LNS of the optical member 200-3 may be in direct contact with the upper surface of the organic light emitting device OLED.

[0166] According to an embodiment, the optical distance Z may be further reduced compared to the above embodiment. In this embodiment, the thickness of the display device 1000 may also be reduced.

[0167] Fig.17 is a front view of a display surface on which a replica unit image is displayed according to another alternative embodiment of the present invention.

[0168] For ease of description, the following description focuses on elements different from those in the above-described embodiment. The same or similar elements are identified with the same reference numerals as those used to describe the above-described embodiment, and any repeated detailed description thereof will be omitted or simplified hereinafter.

[0169] refer to Fig.17 In an embodiment, a plurality of light emitting regions PXA, a first replication region PRA1, and a second replication region PRA2 may be defined on the display surface IS-4. The first replication region PRA1 is arranged around one light emitting region PXA among the plurality of light emitting regions PXA. In this embodiment, the first replication region PRA1 may be defined at opposite sides of one light emitting region PXA in the first direction DR1 and at other opposite sides of the one light emitting region PXA in the second direction DR2.

[0170] The second replication area PRA2 is defined at the outermost side with respect to the one light emitting area PXA. In this embodiment, the first light emitting area PXA1 may be defined between each of the second replication areas PRA2 and the one light emitting area PXA.

[0171] According to an embodiment, the diffraction pattern DFP( Figure 7 ) can diffract light emitted from an organic light emitting device OLED (not shown) to display a plurality of replicated unit images IM' and IM" on the display surface IS-4. The plurality of replicated unit images IM' and IM" display unit images that are identical to each other. The plurality of replicated unit images IM' and IM" include a plurality of first replicated unit images IM' displayed in a first replicated area PRA1 and a plurality of second replicated unit images IM" displayed in a second replicated area PRA2.

[0172] In an embodiment, the distance between the center of the light emitting area PXA and the center of the first replication area PRA1 is equal to the distance between the center of the first replication area PRA1 and the center of the second replication area PRA2. This distance is defined as the replication interval PP'. According to an embodiment, the replication interval PP' may be smaller than the above reference interval PP'. Fig.10 Describes the replication interval PP.

[0173] According to the embodiment, a phenomenon in which a non-light emitting area (not shown) is observed from the outside can be more effectively prevented. In this embodiment, the display quality of the display device 1000 can also be improved.

[0174] Fig.18 is a cross-sectional view of a display module according to another embodiment of the present invention.

[0175] For ease of description, the following description focuses on elements different from those in the above-described embodiment. The same or similar elements are identified with the same reference numerals as those used to describe the above-described embodiment, and any repeated detailed description thereof will be omitted or simplified hereinafter.

[0176] refer to Fig.18 In an embodiment, the display panel 100-5 of the display module DM-5 may be a liquid crystal display panel. In this embodiment, the display device included in the display panel 100-5 may be a liquid crystal capacitor CLC.

[0177] In this embodiment, the display panel 100-5 includes a first substrate SUB1, a second substrate SUB2, and a plurality of liquid crystal capacitors CLC. The first substrate SUB1 defines a rear surface of the display panel 100-5, and the second substrate SUB2 defines an upper surface of the display panel 100-5. The liquid crystal capacitors CLC may be disposed between the first substrate SUB1 and the second substrate SUB2.

[0178] The liquid crystal capacitor CLC includes a pixel electrode PE, a liquid crystal layer LC and a common electrode CE. The pixel electrode PE is disposed on the first substrate SUB1. The pixel electrode PE is connected to the light emitting area PXA ( Fig.10 ) corresponds. A plurality of liquid crystal capacitors CLC share a common electrode CE. The common electrode CE is disposed under the second substrate SUB2 to face the pixel electrode PE. The liquid crystal layer LC is interposed between the pixel electrode PE and the common electrode CE.

[0179] Although not shown in the drawings, according to the embodiment, Fig.18 The display device of the display module DM- 5 shown in FIG. 5 may further include a separate backlight unit.

[0180] Fig.19 is a plan view showing a diffraction pattern according to another alternative embodiment of the present invention.

[0181] For ease of description, the following description focuses on elements different from those in the above-described embodiment. The same or similar elements are identified with the same reference numerals as those used to describe the above-described embodiment, and any repeated detailed description thereof will be omitted or simplified hereinafter.

[0182] refer to Fig.19 In an embodiment, the diffraction pattern DFP is arranged in a stripe form. In one embodiment, for example, the diffraction pattern DFP-6 extends in the first direction DR1 and is arranged in the second direction DR2 on the buffer layer BFL-6.

[0183] Although not shown in the drawings, Fig.19 In such an embodiment in which the diffraction pattern DFP-6 is arranged in one direction as shown in FIG, the direction in which the replication unit images displayed by the diffraction pattern DFP-6 are arranged may be limited to the one direction.

[0184] Fig. 20 is a perspective view of a display device according to another alternative embodiment of the present invention, and Fig.21 It is shown Fig. 20 FIG. 4 is a diagram showing a display device in a usage environment. Fig. 22 yes Fig. 20 A schematic cross-sectional view of a display device shown in FIG.

[0185] For ease of description, the following description focuses on elements different from those in the above-described embodiment. The same or similar elements are identified with the same reference numerals as those used to describe the above-described embodiment, and any repeated detailed description thereof will be omitted or simplified hereinafter.

[0186] refer to Figure 20 to Figure 22 In an embodiment, the display device 1000-7 may be a head mounted display. In this embodiment, the display device 1000-7 may be worn on the head of the user US. The display device 1000-7 may provide an image to the user US while the actual peripheral vision of the user US is blocked. Therefore, the user US wearing the display device 1000-7 may be more easily immersed in virtual reality.

[0187] In this embodiment, the display device 1000-7 includes a main body part BD, a cover part CVR and a display module DM. The main body part BD is wearable on the head of the user US. The main body part BD may be provided with a separate band (not shown) so that the display device 1000-7 can be worn on the head of the user US. The main body part BD may include an optical system OL. In addition to the optical system OL, the main body part BD may also accommodate components with various functions. In one embodiment, for example, an operating part (not shown) for adjusting the volume, the brightness of the screen, etc., etc. may be additionally provided on the outside of the main body part BD. The operating part may be provided as a physical button or may be provided in the form of a touch sensor, etc. In this embodiment, the main body part BD may accommodate a proximity sensor (not shown) for determining whether the display device 1000-7 is worn on the user US.

[0188] The cover member CVR covers the body member BD. The cover member CVR protects components accommodated in the body member BD.

[0189] The display module DM is disposed between the cover part CVR and the body part BD. The cover part CVR is coupled to the body part BD while covering the display module DM. Therefore, the display module DM can be protected by the cover part CVR and the body part BD. The display module DM defines a display surface IS. The display surface IS is parallel to a plane defined by the first direction DR1 and the second direction DR2. An image can be displayed through a partial area of ​​the display surface IS. Fig. 20 and Fig.21 As shown in , the direction in which the image is displayed is a third direction DR3, wherein the third direction DR3 is defined as a direction from the display device 1000-7 to the user US when the user US wears the display device 1000-7.

[0190] In this embodiment, if Fig. 20 As shown in FIG, the display surface IS includes a right-eye display area R_DA, a left-eye display area L_DA, and a non-display area NDA.

[0191] The right-eye display area R_DA and the left-eye display area L_DA are spaced apart in the first direction DR1. A non-display area NDA is defined to surround each of the right-eye display area R_DA and the left-eye display area L_DA.

[0192] The user US receives an image displayed on the right-eye display area R_DA through the right eye, and receives an image displayed on the left-eye display area L_DA through the left eye.

[0193] According to an embodiment, the optical system OL may be spaced apart from the display module DM in the third direction DR3 in which the image is displayed. The optical system OL may be disposed between the display module DM and the eye US_E of the user US.

[0194] The optical system OL magnifies the display surface IS of the display module DM to provide a magnified view to the user US. The optical system OL may include a right-eye optical system OL_R and a left-eye optical system OL_L. The left-eye optical system OL_L magnifies the image to provide a magnified image to the left pupil of the user US, and the right-eye optical system OL_R magnifies the image to provide a magnified image to the right pupil of the user US. In this embodiment, the optical system OL may include a convex spherical lens or an aspherical lens.

[0195] In other respects, the configuration of the display module DM is the same as that of the above embodiment, and any repeated detailed description thereof will be omitted.

[0196] In an embodiment where the display device is a head mounted display, since the display surface IS is magnified by the optical system OL, the phenomenon that the non-luminous area (not shown) is observed by the user US may be more significant than the case where the display surface IS is observed as it is. According to an embodiment, even if the display surface IS is magnified by the optical system OL, the phenomenon that the non-luminous area (not shown) is observed from the outside can be reduced as described above.

[0197] According to the embodiments of the present invention, the display quality of the display device can be improved while reducing the thickness of the display device. In addition, according to the embodiments of the present invention, the durability of the display device can be improved.

[0198] While the invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit or scope of the invention as defined in the following claims.

Claims

1. A display device, comprising: a display module, wherein a display surface is defined on a surface of the display module, Wherein, the display module comprises: A display panel including a plurality of display devices, wherein the plurality of display devices display images on the display surface; A plurality of condenser lenses are arranged on the display panel; a buffer layer, disposed on the focusing lens; and a plurality of diffraction patterns arranged at regular intervals on the buffer layer, wherein the diffraction pattern diffracts light incident to the diffraction pattern, In which, openings are defined between the multiple diffraction patterns, each of the multiple focusing lenses overlaps with multiple first openings among the openings, and the space between adjacent focusing lenses overlaps with multiple second openings among the openings that are different from the first openings.

2. The display device according to claim 1, wherein: The portions of the light diffracted by the diffraction pattern constructively interfere with each other.

3. The display device according to claim 2, wherein: The display device displays pixel unit images on the display surface respectively, The portions of the light that constructively interfere with each other display a replica unit image on the display surface, The image is defined by the pixel unit image and the replication unit image, and Each of the copy-unit images is displayed between adjacent pixel-unit images on the display surface.

4. The display device according to claim 1, wherein: Each of the display devices includes an organic light emitting device.

5. The display device according to claim 4, wherein: The display panel further includes a protection layer covering the organic light emitting device.

6. The display device according to claim 4, wherein: The condensing lens is directly disposed on an upper surface of the display device to cover the display device.

7. The display device according to claim 4, wherein: The distance from the upper surface of the organic light emitting device to the upper surface of the buffer layer is defined as an optical distance, and The optical distance is in the range of 50 μm to 150 μm.

8. The display device according to claim 3, wherein: The replication unit image is displayed by red light.

9. The display device according to claim 8, wherein: One of the adjacent pixel unit images is displayed by the red light, and The other one of the adjacent pixel unit images is displayed by blue light.

10. The display device according to claim 3, wherein: On the display surface, a distance between a center of one of the pixel unit images adjacent to the copy unit image and a center of the copy unit image is 25 μm or less.

11. The display device according to claim 3, wherein: On the display surface, a plurality of the copy unit images are displayed between the adjacent pixel unit images. The replication unit image comprises: a first copy unit image disposed adjacent to one of the adjacent pixel unit images on the display surface; and The second copying unit image faces the one pixel unit image, and the first copying unit image is located between the second copying unit image and the one pixel unit image.

12. The display device according to claim 1, wherein: The intervals between the diffraction patterns are in the range of 4.5 μm to 7.5 μm.

13. The display device according to claim 1, wherein: A curvature radius of each of the condenser lenses is in a range of 7 μm to 14 μm.

14. The display device according to claim 1, wherein: The buffer layer has a refractive index lower than that of each of the condensing lenses.

15. The display device according to claim 1, wherein: The refractive index of the diffraction pattern is the same as the refractive index of the buffer layer.

16. The display device according to claim 1, further comprising: The sub-buffer layer is arranged between the condensing lens and the display panel.

17. The display device according to claim 3, wherein: Each of the display devices includes a liquid crystal capacitor, The liquid crystal capacitor comprises: a pixel electrode corresponding to one of the pixel unit images; a common electrode, disposed on the pixel electrode; and A liquid crystal layer is interposed between the pixel electrode and the common electrode.

18. The display device according to claim 1, further comprising: An input sensing layer is arranged on the display module, Wherein, the input sensing layer includes a plurality of input sensing electrodes.

19. The display device according to claim 1, further comprising: an anti-reflection layer, disposed on the display module, Wherein, the anti-reflection layer comprises: a phase retarding layer that retards a component of incident light; and The polarization layer is arranged on the phase retardation layer.

20. The display device according to claim 1, wherein: The diffraction pattern is in the form of a matrix.

21. The display device according to claim 1, wherein: The diffraction pattern is in the form of fringes.

22. The display device according to claim 1, wherein: An area occupied by each of the condenser lenses in a plan view is larger than an area occupied by each of the display devices in a plan view.

23. The display device according to claim 1, wherein: The display module further includes a cover layer covering the diffraction pattern.

24. The display device according to claim 1, further comprising: an optical system disposed in a path of light emitted from the display module to magnify the image displayed on the display surface, Wherein, the display surface includes a left-eye image display area and a right-eye image display area.

25. A display device comprising: A display module, wherein a display surface is defined in a surface of the display module, wherein the display surface includes a plurality of light emitting areas and a plurality of replication areas, Wherein, the display module comprises: a display panel that displays an image in each of the light emitting areas; a plurality of condenser lenses arranged between the display panel and the display surface, wherein the condenser lenses change the direction of light incident to the condenser lenses to a direction forming a smaller angle with respect to a direction perpendicular to the display surface; a buffer layer, disposed between the condenser lens and the display surface; and a plurality of diffraction patterns arranged between the buffer layer and the display surface and arranged at regular intervals on the buffer layer, wherein the diffraction pattern diffracts light incident thereto to display an image in each of the copy areas, wherein, on the display surface, the replication area is arranged around one of the light emitting areas, and In which, openings are defined between the multiple diffraction patterns, each of the multiple focusing lenses overlaps with multiple first openings among the openings, and the space between adjacent focusing lenses overlaps with multiple second openings among the openings that are different from the first openings.

26. A display device comprising: a display module defining a display surface including a right-eye display area and a left-eye display area, wherein the display module emits light; and an optical system including a lens disposed in a path of the light emitted from the display module to magnify an image displayed by the light, Wherein, the display module comprises: A display panel including a plurality of pixels for displaying images in the right-eye display area and the left-eye display area; A plurality of condenser lenses are arranged on the display panel; a buffer layer, disposed on the focusing lens; and a plurality of diffraction patterns arranged at regular intervals on the buffer layer, wherein the diffraction pattern diffracts a portion of light incident to the diffraction pattern, and In which, openings are defined between the multiple diffraction patterns, each of the multiple focusing lenses overlaps with multiple first openings among the openings, and the space between adjacent focusing lenses overlaps with multiple second openings among the openings that are different from the first openings.

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