Optical device

Abstract

An optical device includes: a lens including a first surface and a plurality of side surfaces; a display device located on a first side surface among the plurality of side surfaces, the display device being configured to provide light to the first side surface; and a first reflector located in the lens and configured to reflect the light provided by the display device to the first surface after the light is reflected from a second side surface among the plurality of side surfaces.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2019-0023931 filed in the Korean Intellectual Property Office on February 28, 2019, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to an optical device. Background Art

[0004] Augmented reality is a technology that superimposes a virtual image on a real image viewed by the user's eyes and displays the superimposed image as a single image. The virtual image may be an image in the form of text or graphics, and the real image may be information about an actual object observed in the field of view (FOV) of the device.

[0005] Augmented reality can be implemented using a head-mounted display (HMD), a head-up display (HUD), etc. When augmented reality is implemented using a head-mounted display, the augmented reality can be provided in the form of lenses so that the user can easily carry it and easily put it on or take it off.

[0006] However, when an augmented reality is realized using a glasses-type (or lens-type) display device, the distance between the display device for displaying a virtual image and the reflector for reflecting the image from the display device and providing the image to the user's eyes is small. The depth of field of the virtual image displayed by the display device may be proportional to the optical distance between the display device and the reflector. Summary of the invention

[0007] Aspects of embodiments of the present disclosure provide an optical device capable of increasing an optical distance between a display device that displays a virtual image and a reflector that reflects the image from the display device to provide the virtual image to eyes of a user.

[0008] However, the aspects of the present disclosure are not limited to the one set forth herein. The above and other aspects of the embodiments of the present disclosure will become more apparent to those skilled in the art to which the present disclosure pertains by referring to the detailed description of the present disclosure given below.

[0009] One or more example embodiments of the present disclosure provide an optical device, comprising: a lens including a first surface and a plurality of side surfaces; a display device located on a first side surface among the plurality of side surfaces, the display device being configured to provide light to the first side surface; and a first reflector located in the lens and configured to reflect the light provided by the display device to the first surface after the light is reflected from a second side surface among the plurality of side surfaces.

[0010] Light provided by the display device may be reflected by a third side surface among the plurality of side surfaces to travel toward a fourth side surface among the plurality of side surfaces, and may be reflected by the fourth side surface to travel toward the second side surface. The third side surface may extend from a first side surface of the first side surface, and the fourth side surface may be located between the second side surface and the third side surface.

[0011] The optical device may further include an optical path changing member between the first side surface and the display device. The optical path changing member may be configured to change a path of light provided by the display device so that the light provided by the display device travels toward the third side surface.

[0012] The light path changing member may include: a base layer; a first light exit surface inclined at a first angle from the base layer; and a second light exit surface at a second angle to the base layer, wherein the first angle is smaller than the second angle.

[0013] The optical device may further include a polarizing film between the first side surface and the light path changing member.

[0014] The optical device may further include a reflective plate on the second side surface, the third side surface, and the fourth side surface.

[0015] The first side surface may have a curved shape, and the display device may have a curved shape on the first side surface.

[0016] The optical device may further include a second reflector in the lens, the second reflector being configured to reflect light provided by the display device to the first surface after the light is reflected from the second side surface.

[0017] The first side surface and the second side surface may face away from each other.

[0018] The optical device may further include a reflective plate located on the second side surface of the lens.

[0019] The second side surface may be bent outwardly, and the reflective plate may have a curved shape on the second side surface.

[0020] The second side surface may be curved toward the center of the lens, and the reflective plate may have a curved shape on the second side surface.

[0021] Light provided by the display device may be incident on the first side surface, may be reflected by the second surface opposite to the first surface to proceed toward the first surface, may be reflected by the first surface to proceed toward the second surface, may be reflected by the second surface to proceed toward the second side surface, may be reflected by the second side surface to proceed toward the first surface, and may be reflected by the first surface to proceed toward the first reflector.

[0022] The optical device may further include an optical path changing member located between the first side surface and the display device. The optical path changing member may be configured to change a path of light provided by the display device so that the light provided by the display device travels toward the second surface.

[0023] One or more example embodiments of the present disclosure provide an optical device, the optical device comprising: a lens, comprising a first lens portion, a second lens portion and a third lens portion, the third lens portion being located between the first lens portion and the second lens portion; a first display device, located on a first side surface of the first lens portion, the first display device being configured to provide first light to the first side surface of the first lens portion; a second display device, located on a first side surface of the second lens portion, the second display device being configured to provide second light to the first side surface of the second lens portion; a first reflector, located in the first lens portion and configured to reflect the second light reflected from the first side surface of the third lens portion to the first surface of the first lens portion; and a second reflector, disposed in the second lens portion to reflect the first light reflected from the first side surface of the third lens portion to the first surface of the second lens portion.

[0024] The first light of the first display device can be incident on the first side surface of the first lens part, can be reflected by the second side surface of the first lens part to go toward the second side surface of the third lens part, can be reflected by the second side surface of the third lens part to go toward the first side surface of the third lens part, and can be reflected by the first side surface of the third lens part to go toward the second reflector.

[0025] The first side surface of the third lens portion may be located between the second side surface of the first lens portion and the second side surface of the second lens portion, and the second side surface of the third lens portion may be a surface opposite to the first side surface of the third lens portion.

[0026] The optical device may further include a first reflective plate located on the second side surface of the first lens portion, the second side surface of the second lens portion, and the first side surface of the third lens portion; and a second reflective plate located on the second side surface of the third lens portion.

[0027] The optical device may further include a first light path changing member located between the first side surface of the first lens portion and the first display device. The first light path changing member may be configured to change the path of the first light of the first display device so that the first light of the first display device travels toward the second side surface of the first lens portion.

[0028] The second light of the second display device can be incident on the first side surface of the second lens part, can be reflected by the second side surface of the second lens part to go toward the second side surface of the third lens part, can be reflected by the second side surface of the third lens part to go toward the first side surface of the third lens part, and can be reflected by the first side surface of the third lens part to go toward the first reflector.

[0029] The optical device may further include a second light path changing member located between the first side surface of the second lens portion and the second display device. The second light path changing member may be configured to change the path of the second light of the second display device so that the second light of the second display device travels toward the second side surface of the second lens portion.

[0030] The first side surface of the first lens portion may have a curved shape, and the first display device may have a curved shape on the first side surface of the first lens portion.

[0031] The first side surface of the second lens portion may have a curved shape, and the second display device may have a curved shape on the first side surface of the second lens portion.

[0032] According to an embodiment of the present disclosure, after the light of the display device located on the first side surface of the lens is totally reflected by at least one side surface of the lens, the light can be emitted by the reflector to the first surface of the lens and provided to the user's eyes. Therefore, the optical distance between the display device and the reflector can be increased. Therefore, the depth of field of the virtual image displayed on the display device can be deepened.

[0033] According to an embodiment of the present disclosure, since the optical device includes multiple reflectors, the brightness of the virtual image provided to the user's eyes can be increased, and the area of ​​the display device viewed by the user's eyes (e.g., the user's field of view (FOV)) can be enlarged.

[0034] According to an embodiment of the present disclosure, a reflective plate may be provided on the remaining side surfaces of the lens except the first side surface on which the display device is located, and the light of the device may be reflected by the reflective plate. Thus, the brightness of the virtual image of the display device provided to the user's eyes may be increased.

[0035] According to an embodiment of the present disclosure, the display device may be a flexible display device having flexibility, and may have a curved shape on the first side surface of the lens formed as a curved surface (or having a curved shape). Therefore, light of the display device may travel toward the third side surface without an optical path changing layer, and may be totally reflected by the third side surface.

[0036] According to an embodiment of the present disclosure, since the reflective plate can be located in a curved shape on one side surface of the lens formed as a curved surface, the reflective plate can be used as a concave mirror. Therefore, the light of the display device reflected by the reflective plate located on one side surface of the lens can be collected by the reflector. Therefore, the brightness of the virtual image of the display device provided to the user's eyes can be increased by the reflector.

[0037] According to an embodiment of the present disclosure, since the reflective plate can be located in a curved shape on one side surface of the lens formed as a curved surface, the reflective plate can be used as a convex mirror. Therefore, the light of the display device reflected by the reflective plate disposed on one side surface of the lens can be diffused. Therefore, the virtual image of the display device provided to the user's eyes by the reflector can be viewed by the user in an enlarged manner.

[0038] Aspects of the embodiments of the present disclosure are not limited to the aforementioned aspects, and various other aspects are included in the present specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and other aspects and features of the present disclosure will become more apparent by describing in detail exemplary embodiments of the present disclosure with reference to the accompanying drawings, in which:

[0040] Figure 1 is a perspective view showing an optical device according to an embodiment;

[0041] FIG. 2A to FIG. 2B It is shown Figure 1 A perspective view of an example embodiment of a lens of an optical device;

[0042] Figure 3 It is shown Figure 1 A cross-sectional view of a display device of an optical device;

[0043] FIG. 4A to FIG. 4C Show Figure 1 An example of a light path changing layer of an optical device;

[0044] Figure 5 is a perspective view showing an optical device according to an embodiment;

[0045] Figure 6 is a perspective view showing an optical device according to an embodiment;

[0046] Figure 7 is a perspective view showing an optical device according to an embodiment;

[0047] Figure 8 is a perspective view showing an optical device according to an embodiment;

[0048] Fig. 9 It is shown Figure 8A perspective view of an example embodiment of a lens of an optical device;

[0049] Fig.10 It is shown Figure 8 A side view of an example of a light path of an optical device;

[0050] Fig.11 It is shown Figure 8 A side view of an example of a light path of an optical device;

[0051] Fig.12 is a perspective view showing an optical device according to an embodiment;

[0052] Fig.13 is a perspective view showing an optical device according to an embodiment;

[0053] Fig.14 is a perspective view showing an optical device according to an embodiment;

[0054] Fig.15 is a perspective view showing an optical device according to an embodiment;

[0055] Fig.16 It is shown Fig.15 A perspective view of an example of a lens of an optical device;

[0056] Fig.17 is a perspective view showing an example of paths of first light of a first display device and second light of a second display device;

[0057] FIG. 18A to FIG. 18B is a perspective view showing an optical device according to an embodiment;

[0058] Fig.19 is a perspective view showing an optical device according to an embodiment;

[0059] Fig. 20 is a perspective view showing an optical device according to an embodiment; and

[0060] Fig.21 2 is an exemplary diagram showing a glasses-type display including an optical device according to various embodiments. DETAILED DESCRIPTION

[0061] The present disclosure will now be described more fully below with reference to the accompanying drawings, in which example embodiments of the present disclosure are shown. However, the present disclosure may be embodied in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be complete and comprehensive, and the aspects and features of the present disclosure will be fully conveyed to those skilled in the art. Therefore, processes, elements and techniques that are not necessary for a person of ordinary skill in the art to fully understand the aspects and features of the present disclosure may not be described. Unless otherwise stated, throughout the accompanying drawings and written descriptions, the same reference numerals indicate the same elements, and therefore, their descriptions may not be repeated. In the accompanying drawings, the relative sizes of elements, layers and regions may be exaggerated for clarity.

[0062] 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 parts, these elements, components, regions, layers and / or parts should not be limited to these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, the first element, component, region, layer or part described below can be named as the second element, component, region, layer or part without departing from the spirit and scope of the disclosure.

[0063] For ease of explanation, spatial relative terms such as "below", "below", "below", "below", "above", and "on" may be used herein to describe the relationship between one element or feature and another element or feature as shown in the figure. It should be understood that spatial relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure is flipped, the elements described as being "below" or "below" or "below" other elements or features will then be oriented to be located "above" other elements or features. Therefore, the example terms "below" and "below" can include the orientations above and below. The device can be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative descriptive language used herein can be interpreted accordingly.

[0064] 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, it can be directly on, directly connected to, or coupled to the other element or layer, or one or more intervening elements or layers may be present. Additionally, it should be understood that when an element or layer is referred to as being “between” two elements or layers, it can be the only element or layer between the two elements or layers, or one or more intervening elements or layers may also be present.

[0065] The purpose of the terms used herein is only to describe specific embodiments and is not intended to limit the present disclosure. The singular form "one" used herein is intended to also include the plural form, unless the context clearly gives other instructions. It is further understood that the terms "include" and "comprise" indicate the presence of stated features, integral bodies, steps, operations, elements and / or parts when used in this specification, but do not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, parts and / or their combinations. The term "and / or" used herein includes any combination and all combinations of one or more of the listed associated items. Statements such as "at least one of" modify the entire column of elements when located after a column of elements, rather than modifying the individual elements in the column.

[0066] As used herein, the terms "substantially", "approximately" and similar terms are used as approximate terms rather than terms of degree, and are intended to take into account the inherent variations in measurements or calculations recognized by those of ordinary skill in the art. In addition, when describing embodiments of the present disclosure, the use of "may" refers to "one or more embodiments of the present disclosure". In addition, when describing embodiments of the present disclosure, the use of alternative language such as "or" refers to "one or more embodiments of the present disclosure" for each corresponding item listed. As used herein, the terms "use", "being used" and "being used" may be considered to be synonymous with the terms "utilize", "being utilized" and "being utilized", respectively. Similarly, the term "exemplary" is intended to indicate an example or illustration.

[0067] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. It should be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with that in the context of the relevant art and this specification, and should not be interpreted in an idealized or overly formal sense, unless such a definition is explicitly made herein.

[0068] In addition, any numerical range disclosed and / or listed herein is intended to include all sub-ranges of the same numerical precision contained in the listed range. For example, the range "1.0 to 10.0" is intended to include all sub-ranges between the listed minimum value 1.0 and the listed maximum value 10.0 (including the minimum value and the maximum value), that is, having a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as, for example, 2.4 to 7.6. Any maximum numerical limit listed herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit listed in this specification is intended to include all higher numerical limits contained therein. Therefore, the applicant reserves the right to modify this specification (including claims) to explicitly list any sub-ranges contained in the range explicitly listed herein.

[0069] Hereinafter, embodiments of the present disclosure are described with reference to the accompanying drawings.

[0070] Figure 1 is a perspective view showing an optical device 10 according to the embodiment. FIG. 2A to FIG. 2B It is shown Figure 1 1 is a perspective view of an example of a lens 100 of the optical device 10 . Figure 3 It is shown Figure 1 2 is a cross-sectional view of a display device 200 of an optical device 10. FIG. 4A to FIG. 4C Show Figure 1 An example of the light path changing layer 310 of the optical device 10 is shown.

[0071] refer to Figure 1 , FIG. 2A to FIG. 2B , Figure 3 as well as FIG. 4A to FIG. 4C , the optical device 10 according to the embodiment includes a lens 100, a display device 200, a light path changing layer 310, a polarizing film 320, and a first reflector 410. The optical device 10 may be a device for providing augmented reality or a virtual image.

[0072] The lens 100 may be formed of, for example, glass or plastic in a transparent or translucent manner. Therefore, the user may view a real image through the lens 100. The lens 100 may have a refractive power (eg, a predetermined refractive power) in consideration of the visual acuity of the user.

[0073] like Figure 2A As shown in , the lens 100 may be formed as an octahedron having a first surface SF1 and a second surface SF2, a first side surface SIF1, a second side surface SIF2, a third side surface SIF3, a fourth side surface SIF4, a fifth side surface SIF5, and a sixth side surface SIF6, which may be hexagonal. Figure 2AWhen formed into an octahedron as shown in, the second side surface SIF2 can extend from one side (e.g., the first side) of the first side surface SIF1, and the third side surface SIF3 can extend from the other side (e.g., the second side) of the first side surface SIF1 opposite to the first side. The second side surface SIF2 and the third side surface SIF3 can face each other (e.g., can be back to back with each other), and the length of the second side surface SIF2 in the first direction (X-axis direction) can be substantially the same as the length of the third side surface SIF3 in the first direction (X-axis direction). The fourth side surface SIF4 can be arranged between the second side surface SIF2 and the third side surface SIF3. The fifth side surface SIF5 can be arranged between the third side surface SIF3 and the fourth side surface SIF4. The sixth side surface SIF6 can be arranged between the second side surface SIF2 and the fourth side surface SIF4. The first surface SF1 can be a top surface, and the second surface SF2 can be a bottom surface. The first surface SF1, which is a surface on which the user's eye E (eg, the user's eye) is located (or a surface near or adjacent to the user's eye E), may be an exit surface from which the first reflector 410 emits light of the display device 200. The second surface SF2 may be an outer surface of the lens 100.

[0074] Alternatively, if Figure 2B As shown in FIG. 1 , according to an embodiment, the lens 100 may be formed as a hexahedron having a first surface SF1, a second surface SF2, and a first side surface SIF1, a second side surface SIF2, a third side surface SIF3, and a fourth side surface SIF4. Figure 2B When formed as a hexahedron as shown in , the second side surface SIF2 may extend from one side (e.g., the first side) of the first side surface SIF1, the third side surface SIF3 may extend from the other side (e.g., the second side) of the first side surface SIF1 opposite to the first side, and the fourth side surface SIF4 may face the first side surface SIF1. The first surface SF1 may be a top surface, and the second surface SF2 may be a bottom surface. The first surface SF1 (which is a surface on which the user's eye E is located (or a surface near or adjacent to the user's eye E)) may be an exit surface from which the first reflector 410 emits light of the display device 200. The second surface SF2 may be an outer surface of the lens 100.

[0075] The lens 100 is not limited to FIG. 2A to FIG. 2BThe lens 100 may be formed in the shape shown in , and may be formed into a polyhedron having, for example, a polygonal first surface, a second surface, and a side surface. In addition, the lens 100 may be formed into other suitable shapes, such as a cylinder, an elliptical cylinder, a semicircular cylinder, a semi-elliptical cylinder, a deformed cylinder, or a deformed semicircular cylinder. The deformed cylinder and the deformed semicircular cylinder refer to cylinders and semicircular cylinders having non-constant diameters.

[0076] The first reflector 410 is located (or disposed) in the lens 100. The first reflector 410 may be a micro mirror, such as a pin mirror. Figure 1 The first reflector 410 is shown to have a circular cross-section, but the first reflector 410 may have any suitable shape, such as an elliptical or polygonal cross-section.

[0077] The first reflector 410 may be formed to have a size smaller than the size of the pupil of the eye E. For example, the diameter of the first reflector 410 may be in the range of about 500 μm to about 4 mm. According to an embodiment, since the user focuses on the real image, it may be difficult for the user to recognize the first reflector 410. However, as the size of the first reflector 410 decreases, the brightness of the virtual image provided to the user's eye E by the flexible display device 200 also decreases. Therefore, the size of the first reflector 410 may be set in consideration of this fact.

[0078] like Figure 1 As shown in , the first reflector 410 may have a cylindrical shape. In some embodiments, one of the two bottom surfaces may be a reflective surface implemented as a mirror, while the other of the two bottom surfaces and the side surface may not be implemented as a mirror. In order to transmit the light L totally reflected from the second side surface SIF2 of the lens 100 to the first surface SF1 of the lens 100, the bottom surface of the lower portion of the first reflector 410 may be a reflective surface, such as Figure 5 as shown in .

[0079] The first reflector 410 may reflect the virtual image displayed on the display device 200 and provide the virtual image to the user's eye E. Since the virtual image displayed on the display device 200 is reflected by the first reflector 410, the optical distance between the display device 200 and the first reflector 410 may be increased. Therefore, the depth of field of the virtual image displayed on the display device 200 may be deepened.

[0080] The display device 200 displays a virtual image for realizing augmented reality. The display device 200 may be disposed on the side surface SIF1 or SIF2 of the lens 100. For example, the display device 200 may be disposed on the first side surface SIF1 of the lens 100.

[0081] The display device 200 may be a flexible display device having flexibility and may be configured to be bent. For example, the display device 200 may be a flexible display device having flexibility and may be configured to be bent. Figure 3 The organic light emitting display device shown in , or may be an organic light emitting display device including quantum dots.

[0082] refer to Figure 3 , the display device 200 may include a substrate 1100 , a thin film transistor layer 1230 , a light emitting element layer 1240 , and a thin film encapsulation layer 1300 .

[0083] The thin film transistor layer 1230 is formed on the substrate 1100. The thin film transistor layer 1230 includes a thin film transistor 1235, a gate insulating film 1236, an interlayer insulating film 1237, a protective film 1238, and a planarization film 1239.

[0084] A buffer film may be formed on the substrate 1100. The buffer film may be formed on the substrate 1100 to protect the thin film transistor 1235 and the light emitting element from moisture penetrating through the substrate 1100, which may be susceptible to moisture penetration. The buffer film may include a plurality of inorganic films stacked alternately. For example, the buffer film may be composed of a silicon oxide film (SiO x ), silicon nitride film (SiN x ) and / or SiON are alternately stacked to form a plurality of films. In some embodiments, the buffer film may be omitted.

[0085] The thin film transistors 1235 may be formed on the buffer film. Each of the thin film transistors 1235 includes an active layer 1231, a gate electrode 1232, a source electrode 1233, and a drain electrode 1234. Figure 3 It is shown that each of the thin film transistors 1235 is formed by a top gate method in which the gate electrode 1232 is formed above the active layer 1231, but the present disclosure is not limited thereto. For example, each of the thin film transistors 1235 may be formed by a bottom gate method in which the gate electrode 1232 is located below the active layer 1231 or a dual gate method in which the gate electrode 1232 is located above and below the active layer 1231.

[0086] The active layer 1231 may be formed on the buffer film. The active layer 1231 may be formed of a silicon-based semiconductor material or an oxide-based semiconductor material. A light shielding layer for shielding external light incident on the active layer 1231 may be formed between the buffer film and the active layer 1231.

[0087] The gate insulating film 1236 may be formed on the active layer 1231. The gate insulating film 1236 may be made of, for example, a silicon oxide film (SiO x ), silicon nitride film (SiN x ) or an inorganic film formation of a multilayer film thereof.

[0088] The gate electrode 1232 and the gate line may be formed on the gate insulating film 1236. The gate electrode 1232 and the gate line may be formed as a single layer or a multilayer made of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and / or an alloy thereof.

[0089] An interlayer insulating film 1237 may be formed on the gate electrode 1232 and the gate line. The interlayer insulating film 1237 may be made of, for example, a silicon oxide film (SiO x ), silicon nitride film (SiN x ) or an inorganic film formation of a multilayer film thereof.

[0090] The source electrode 1233, the drain electrode 1234, and the data line may be formed on the interlayer insulating film 1237. Each of the source electrode 1233 and the drain electrode 1234 may be connected to the active layer 1231 via a contact opening (or contact hole) passing through the gate insulating film 1236 and the interlayer insulating film 1237. The source electrode 1233, the drain electrode 1234, and the data line may be formed as a single layer or a multilayer made of molybdenum (Mo), aluminum (Al), chromium (Cr), gold (Au), titanium (Ti), nickel (Ni), neodymium (Nd), copper (Cu), and / or an alloy thereof.

[0091] A protective film 1238 for insulating the thin film transistor 1235 may be formed on the source electrode 1233, the drain electrode 1234, and the data line. The protective film 1238 may be made of, for example, a silicon oxide film (SiO x ), silicon nitride film (SiN x ) or an inorganic film formation of a multilayer film thereof.

[0092] The planarization film 1239 may be formed on the protection film 1238 to planarize a step caused by the thin film transistor 1235. The planarization film 1239 may be formed of an organic film such as acrylic resin, epoxy resin, phenol resin, polyamide resin, and / or polyimide resin.

[0093] The light emitting element layer 1240 is formed on the thin film transistor layer 1230. The light emitting element layer 1240 includes a light emitting element and a pixel defining layer 1244.

[0094] The light emitting element and the pixel defining layer 1244 are formed on the planarization film 1239. The light emitting element may be an organic light emitting diode (or an organic light emitting diode device). For example, the light emitting elements may each include an anode electrode 1241, a light emitting layer 1242, and a cathode electrode 1243.

[0095] The anode electrode 1241 may be formed on the planarization film 1239. The anode electrode 1241 may be connected to the drain electrode 1234 of the thin film transistor 1235 via a contact opening (or a contact hole) passing through the protection film 1238 and the planarization film 1239.

[0096] The pixel defining layer 1244 may be formed to cover the edge of the anode electrode 1241 on the planarization film 1239 to divide the pixel. For example, the pixel defining layer 1244 may be used as a pixel defining layer for defining pixels. Each of the pixels represents a region in which the anode electrode 1241, the light emitting layer 1242, and the cathode electrode 1243 are sequentially stacked and holes from the anode electrode 1241 and electrons from the cathode electrode 1243 are coupled to each other in the light emitting layer 1242 to emit light.

[0097] The light-emitting layer 1242 is formed on the anode electrode 1241 and the pixel defining layer 1244. The light-emitting layer 1242 may be an organic light-emitting layer. The light-emitting layer 1242 may emit one of red light, green light, and blue light. The peak wavelength range of the red light may be about 620nm to about 750nm, and the peak wavelength range of the green light may be about 495nm to about 570nm. Further, the peak wavelength range of the blue light may be about 450nm to about 495nm. Alternatively, the light-emitting layer 1242 may be a white light-emitting layer that emits white light. In some embodiments, the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer may have a stacked form and may be a common layer formed together for the pixel. In some embodiments, the display device 200 may further include a separate color filter for displaying red, green, or blue.

[0098] The light emitting layer 1242 may include a hole transport layer, an emission layer, and an electron transport layer. In addition, the light emitting layer 1242 may be formed in a series structure of two or more stacks, in which case a charge generation layer may be formed between the stacks.

[0099] The cathode electrode 1243 is formed on the light emitting layer 1242. The cathode electrode 1243 may be formed to cover the light emitting layer 1242. The cathode electrode 1243 may be a common layer commonly formed for pixels.

[0100] When the light emitting element layer 1240 is formed by a top emission method in which light is emitted upward, the anode electrode 1241 may be formed of a metal material having a high reflectivity, to have a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and indium tin oxide (ITO) (ITO / Al / ITO), an APC alloy and / or a stacked structure of an APC alloy and ITO (ITO / APC / ITO). The APC alloy is an alloy of silver (Ag), palladium (Pd) and copper (Cu). Further, the cathode electrode 1243 may be formed of a transparent conductive material (TCO) such as ITO or indium zinc oxide (IZO) that can transmit light, or a semi-transmissive conductive material such as magnesium (Mg), silver (Ag) or an alloy of magnesium (Mg) and silver (Ag). When the cathode electrode 1243 is formed of a semi-transmissive conductive material, the luminous efficiency may be improved by a microcavity.

[0101] When the light emitting element layer 1240 is formed by a bottom emission method in which light is emitted downward, the anode electrode 1241 may be formed of a transparent conductive material (TCO) such as ITO or IZO, or a semi-transmissive conductive material such as magnesium (Mg), silver (Ag), or an alloy of magnesium (Mg) and silver (Ag). The cathode electrode 1243 may be formed of a metal material having a high reflectivity to have a stacked structure of aluminum and titanium (Ti / Al / Ti), a stacked structure of aluminum and ITO (ITO / Al / ITO), an APC alloy and / or a stacked structure of an APC alloy and ITO (ITO / APC / ITO). When the anode electrode 1241 is formed of a semi-transmissive conductive material, the light emitting efficiency may be improved by a microcavity.

[0102] The thin film encapsulation layer 1300 is formed on the light emitting element layer 1240. The thin film encapsulation layer 1300 prevents oxygen or moisture from penetrating the light emitting layer 1242 and the cathode electrode 1243, or reduces its possibility. According to an embodiment, the thin film encapsulation layer 1300 may include at least one inorganic film. The inorganic film may be formed of silicon nitride, aluminum nitride, zirconium nitride, titanium nitride, hafnium nitride, tantalum nitride, silicon oxide, aluminum oxide and / or titanium oxide. Further, the thin film encapsulation layer 1300 may further include at least one organic film. The organic film may be formed to have a thickness sufficient to prevent particles from penetrating the thin film encapsulation layer 1300 and being injected into the light emitting layer 1242 and the cathode electrode 1243 or reducing its possibility. The organic film may include epoxy resin, acrylate and / or polyurethane acrylate. Instead of the thin film encapsulation layer 1300, an encapsulation substrate may be provided on the light emitting element layer 1240.

[0103] The circuit board 210 is attached to one end (eg, a first end) of the display device 200 (eg, see Figure 1). Alternatively, the circuit board 210 may be attached to the other end (e.g., the second end) of the display device 200. Alternatively, when there are many signal lines and voltage lines for driving the display device 200, two flexible circuit boards 210 may be attached to the first end and the second end of the display device 200, respectively. The circuit board 210 may be a flexible printed circuit board.

[0104] The integrated driving circuit 220 may be mounted on the circuit board 210. The integrated driving circuit 220 may supply the display device 200 with a data voltage, a scan control signal, a source voltage, etc. for driving the display device 200. The integrated driving circuit 220 may be an integrated circuit.

[0105] The optical path changing layer 310 may be disposed between the first side surface SIF1 of the lens 100 and the display device 200. Figure 1 As shown in , the light path changing layer 310 may change the path of the light L so that the light L of the display device 200 incident on the first side surface SIF1 of the lens 100 proceeds toward the third side surface SIF3 of the lens 100 .

[0106] like FIG. 4A to FIG. 4C As shown in FIG. 3 , the light path changing layer 310 may include a base layer 311 a and a light path changing pattern 311 b disposed on the base layer 311 a. The light path changing pattern 311 b may include a first light exiting surface 3111 and a second light exiting surface 3112 .

[0107] The light path changing pattern 311b may have a triangular side surface (or a side surface having a triangular shape). For example, the light path changing pattern 311b may have an isosceles triangular side surface, so that a first angle θ1 between the upper surface of the base layer 311a and the first light exit surface 3111 is substantially equal to a second angle θ2 between the upper surface of the base layer 311a and the second light exit surface 3112. Alternatively, the first angle θ1 may be smaller than the second angle θ2, and the length of the first light exit surface 3111 may be greater than the length of the second light exit surface 3112. For example, as Figure 4C As shown in , the light path changing pattern 311 b may have a right triangle side surface having a second angle θ2 of 90° and a first angle θ1 of 30°.

[0108] like Figure 4B and Figure 4C As shown in FIG. 3 , the upper planarization layer 313 may be formed on the optical path changing pattern 311 b . The refractive index of the optical path changing pattern 311 b may be different from that of the upper planarization layer 313 .

[0109] like Figure 4A and Figure 4BAs shown in , when the light path changing pattern 311b has an isosceles triangle side surface having a first angle θ1 and a second angle θ2 that are substantially equal to each other, light L incident on the light path changing pattern 311b may be refracted by the first light exiting surface 3111 and the second light exiting surface 3112. Therefore, light L incident on the light path changing layer 310 may be scattered by the light path changing layer 310.

[0110] like Figure 4C As shown in , when the light path changing pattern 311b is formed so that the first angle θ1 is smaller than the second angle θ2, and the length of the first light exit surface 3111 is larger than the length of the second light exit surface 3112, the light L incident on the light path changing pattern 311b may be refracted by the first light exit surface 3111. Figure 4C As shown in , most of the light L incident on the optical path changing layer 310 may be refracted by the optical path changing layer 310 in an upper right direction of the optical path changing layer 310 .

[0111] The light L of the display device 200 may travel toward the third side surface SIF3 of the lens 100 through the optical path changing layer 310. When the refractive index of the lens 100 is greater than the refractive index of the air and the incident angle of the light L incident on the third side surface SIF3 of the lens 100 is greater than the critical angle, the light L of the display device 200 may be totally reflected at the third side surface SIF3 of the lens 100. A portion of the light L of the display device 200 totally reflected by the third side surface SIF3 of the lens 100 may be totally reflected by the fourth side surface SIF4 of the lens 100. A portion of the light L of the display device 200 totally reflected by the fourth side surface SIF4 of the lens 100 may be totally reflected by the second side surface SIF2 of the lens 100. A portion of the light L totally reflected by the second side surface SIF2 of the lens 100 may be emitted to the first surface SF1 of the lens 100 through the first reflector 410 and provided to the eye E of the user.

[0112] Although Figure 1It is shown that after the light L of the display device 200 is totally reflected by the three side surfaces of the lens 100, the light L is reflected by the first reflector 410, emitted to the first surface SF1 of the lens 100, and provided to the user's eye E, but the present disclosure is not limited thereto. For example, after the light L of the display device 200 is totally reflected by the third side surface SIF3 and the fourth side surface SIF4 of the lens 100, the light L may be emitted by the first reflector 410 to the first surface SF1 of the lens 100 and provided to the user's eye E. Alternatively, after the light L of the display device 200 is totally reflected by the third side surface SIF3 of the lens 100, the light L may be emitted by the first reflector 410 to the first surface SF1 of the lens 100 and provided to the user's eye E. Therefore, even when the user focuses on the real image through the lens 100, the user can clearly view the virtual image displayed by the display device 200. For example, even when the user does not move the focus adjusted to the real image, the user can clearly view the virtual image displayed by the display device 200.

[0113] The greater the number of side surfaces of the lens 100 that cause the light L of the display device 200 to be totally reflected, the deeper the depth of field of the virtual image displayed on the display device 200. However, since the loss of the light L of the display device 200 increases, the brightness of the virtual image of the display device 200 provided to the user's eye E may be reduced. Therefore, the number of side surfaces of the lens 100 that cause the light L of the display device 200 to be totally reflected may be set in consideration of the depth of field of the virtual image displayed on the display device 200 and the brightness of the virtual image of the display device 200 provided to the user's eye E.

[0114] The polarizing film 320 may be disposed between the first side surface SIF1 of the lens 100 and the optical path changing layer 310. The polarizing film 320 may include a linear polarizing plate and a phase delay film such as a quarter wave (λ / 4) plate. For example, the linear polarizing plate may be disposed on the first side surface SIF1 of the lens 100, and the phase delay film may be disposed between the linear polarizing plate and the optical path changing layer 310. Therefore, the polarizing film 320 may prevent the light from the first side surface SIF1 of the lens 100 from being reflected by the display device 200 and emitted to the first side surface SIF1 of the lens 100, while allowing the light L of the display device 200 to travel to the first side surface SIF1 of the lens 100.

[0115] according to Figures 1 to 4CIn the embodiment shown in FIG. 1 , after the light L of the display device 200 disposed on the first side surface SIF1 of the lens 100 is totally reflected by at least one side surface of the lens 100, the light L of the display device 200 may be emitted to the first surface SF1 of the lens 100 by the first reflector 410 and provided to the user's eye E. Therefore, the optical distance between the display device 200 and the first reflector 410 may be increased. Therefore, the depth of field of the virtual image displayed on the display device 200 may be deepened.

[0116] Figure 5 is a perspective view showing an optical device 10_1 according to the embodiment.

[0117] Figure 5 The embodiments shown in Figures 1 to 4C The embodiment shown in FIG. 1 is different in that the optical device 10_1 includes a plurality of reflectors 410 and 420. Figures 1 to 4C The overlapping descriptions of the discussed embodiments may be omitted, and the following references are made to Figure 5 Main description and Figures 1 to 4C The differences from the embodiment shown in .

[0118] refer to Figure 5 , the optical device 10_1 includes a plurality of reflectors 410 and 420. Figure 5 The optical device 10_1 is shown to include two reflectors 410 and 420, but the present disclosure is not limited thereto. For example, the optical device 10_1 may include three or more reflectors. As the number of reflectors increases, the brightness of the virtual image provided to the user's eye E may increase, and the area of ​​the display device 200 viewed by the user's eye E (e.g., the user's field of view (FOV)) may be enlarged.

[0119] The optical device 10_1 may include a first reflector 410 and a second reflector 420, such as Figure 5 as shown in .

[0120] The first reflector 410 and the second reflector 420 are provided in the lens 100. The first reflector 410 and the second reflector 420 may be micro mirrors such as pin mirrors. Figure 5 The first reflector 410 and the second reflector 420 are shown to have circular cross-sections, but the first reflector 410 and the second reflector 420 may have any suitable shape, such as an elliptical or polygonal cross-section.

[0121] The first reflector 410 and the second reflector 420 are formed to be smaller in size than the pupil of the eye E. For example, each of the first reflector 410 and the second reflector 420 may be formed to have a diameter of about 500 μm to about 4 mm. According to an embodiment, since the user focuses on the real image, it is difficult to recognize the first reflector 410 and the second reflector 420. However, as the size of the first reflector 410 and the second reflector 420 is reduced, the brightness of the virtual image provided to the user's eye E by the flexible display device 200 is also reduced. Therefore, the size of the first reflector 410 and the second reflector 420 may be set or selected in consideration of this fact.

[0122] The first reflector 410 and the second reflector 420 may have a cylindrical shape, such as Figure 5 . According to an embodiment, one of the two bottom surfaces may be a reflective surface implemented as a mirror, and according to an embodiment, the other of the two bottom surfaces and the side surface are not implemented as a mirror. In order to emit the light L totally reflected from the second side surface SIF2 of the lens 100 to the first surface SF1 of the lens 100, the bottom surface of the first reflector 410 (e.g., the bottom surface of the lower portion of the first reflector 410) and the bottom surface of the second reflector 420 (e.g., the bottom surface of the lower portion of the second reflector 420) may be reflective surfaces.

[0123] A portion of the light L totally reflected by the second side surface SIF2 of the lens 100 may be reflected by the first reflector 410 and the second reflector 420, emitted to the first surface SF1 of the lens 100, and provided to the user's eye E. Since the virtual image displayed on the display device 200 is reflected by the first reflector 410 and the second reflector 420, its depth of field is deepened.

[0124] Although Figure 5 It is shown that after the light L of the display device 200 is totally reflected by the three side surfaces of the lens 100, the light L is emitted by the first reflector 410 and the second reflector 420 to the first surface SF1 of the lens 100, and is provided to the user's eye E, but the present disclosure is not limited thereto. For example, after the light L of the display device 200 is totally reflected by two side surfaces (e.g., the third side surface SIF3 and the fourth side surface SIF4 of the lens 100), the light L may be emitted by the first reflector 410 and the second reflector 420 to the first surface SF1 of the lens 100, and is provided to the user's eye E. Alternatively, after the light L of the display device 200 is totally reflected by one side surface (e.g., the third side surface SIF3 of the lens 100), the light L may be emitted by the first reflector 410 and the second reflector 420 to the first surface SF1 of the lens 100, and is provided to the user's eye E.

[0125] The greater the number of side surfaces of the lens 100 that cause the light L of the display device 200 to be totally reflected, the deeper the depth of field of the virtual image displayed on the display device 200. However, since the loss of the light L of the display device 200 increases, the brightness of the virtual image of the display device 200 provided to the user's eye E may be reduced. Therefore, the number of side surfaces of the lens 100 that cause the light L of the display device 200 to be totally reflected may be set (or selected) in consideration of the depth of field of the virtual image displayed on the display device 200 and the brightness of the virtual image of the display device 200 provided to the user's eye E.

[0126] according to Figure 5 In the embodiment shown in , since the optical device 10_1 includes multiple reflectors 410 and 420, the brightness of the virtual image provided to the user's eye E can be increased, and the area of ​​the display device 200 viewed by the user's eye E (for example, the user's field of view (FOV)) can be enlarged compared to an embodiment in which only one reflector is provided.

[0127] Figure 6 is a perspective view showing an optical device 10_2 according to the embodiment.

[0128] Figure 6 The embodiments shown in Figures 1 to 4C The embodiment shown in FIG. 1 is different in that the reflective plate 330 is formed on the remaining side surfaces SIF2 to SIF6 of the lens 100 except the first side surface SIF1. Figures 1 to 4C The overlapping descriptions of the described embodiments may be omitted, and the following reference is made to Figure 6 Main description and Figures 1 to 4C The differences from the embodiment shown in .

[0129] refer to Figure 6 , the optical device 10_2 further includes a reflection plate 330, which is disposed on the second side surface SIF2, the third side surface SIF3, the fourth side surface SIF4, the fifth side surface SIF5, and the sixth side surface SIF6 of the lens 100. One surface of the reflection plate 330 facing the second side surface SIF2, the third side surface SIF3, the fourth side surface SIF4, the fifth side surface SIF5, and the sixth side surface SIF6 of the lens 100 may be implemented as a mirror.

[0130] The light L of the display device 200 may travel toward the third side surface SIF3 of the lens 100 through the optical path changing layer 310, and may be reflected by the reflection plate 330 disposed on the third side surface SIF3. Further, a portion of the light L of the display device 200 reflected by the reflection plate 330 disposed on the third side surface SIF3 of the lens 100 may be reflected by the reflection plate 330 disposed on the fourth side surface SIF4 of the lens 100. Further, a portion of the light L of the display device 200 reflected by the reflection plate 330 disposed on the fourth side surface SIF4 of the lens 100 may be reflected by the reflection plate 330 disposed on the second side surface SIF2 of the lens 100. A portion of the light L of the display device 200 reflected by the reflection plate 330 disposed on the second side surface SIF2 of the lens 100 may be emitted to the first surface SF1 of the lens 100 by the first reflector 410, and provided to the user's eye E. Therefore, even when the user focuses on a real image through the lens 100, the user may clearly view a virtual image displayed by the display device 200. Therefore, even when the user does not move the focus adjusted to the real image, the user can clearly view the virtual image displayed by the display device 200 .

[0131] exist Figures 1 to 4C In the embodiment shown in , light totally reflected by at least one side surface of the lens 100 is emitted by the first reflector 410 onto the first surface SF1 of the lens 100. Figure 6 In the embodiment shown in , light reflected by the reflection plate 330 provided on at least one side surface of the lens 100 is emitted to the first surface SF1 of the lens 100 by the first reflector 410. Total reflection occurs only when the incident angle is greater than the critical angle, and the reflection plate 330 almost completely reflects the incident light. Therefore, when the reflection plate 330 is used, the ratio of the reflected light to the incident light can be increased compared to the embodiment when total reflection is used.

[0132] according to Figure 6 In the embodiment shown in FIG. 1 , the reflective plate 330 is disposed on the remaining side surfaces SIF2, SIF3, SIF4, SIF5, and SIF6 (except the first side surface SIF1) of the lens 100, and the light L of the display device 200 is reflected by the reflective plate 330. Therefore, the brightness of the virtual image of the display device 200 provided to the user's eye E can be increased.

[0133] Figure 7 is a perspective view showing an optical device 10_3 according to the embodiment.

[0134] Figure 7 The embodiments shown in Figures 1 to 4CThe embodiment shown in FIG. 1 is different in that the first side surface SIF1 of the lens 100 is formed as a curved surface having a predetermined curvature. Figures 1 to 4C Overlapping descriptions of the described embodiments may be omitted, and reference may be made to Figure 7 Main description and Figures 1 to 4C The differences from the embodiment shown in .

[0135] refer to Figure 7 , the first side surface SIF1 of the lens 100 may be a curved surface, for example, may have a curved shape having a predetermined curvature. The first side surface SIF1 of the lens 100 may have a curved shape in an outward direction of the first side surface SIF1 (for example, a first direction (X-axis direction)). Therefore, a portion of the first side surface SIF1 of the lens 100 may face a portion of the third side surface SIF3.

[0136] The display device 200 may be a flexible display device having flexibility, which may be bent. Therefore, the display device 200 may be disposed in a curved shape on the first side surface SIF1 of the lens 100 formed as a curved surface. Since a portion of the first side surface SIF1 of the lens 100 may face a portion of the third side surface SIF3 of the lens 100, the light L of the display device 200 may travel toward the third side surface SIF3 and may be totally reflected by the third side surface SIF3. Therefore, the optical path changing layer 310 may be omitted.

[0137] Although Figure 7 It is shown that the first side surface SIF1 of the lens 100 is formed as a curved surface, but the present disclosure is not limited thereto. For example, when the length of the second side surface SIF2 of the lens 100 in the first direction (X-axis direction) is shorter than the length of the third side surface SIF3 of the lens 100 in the first direction (X-axis direction), the first side surface SIF1 may be disposed obliquely so that a portion of the first side surface SIF1 of the lens 100 may face a portion of the third side surface SIF3. According to an embodiment, the first side surface SIF1 may be formed as a flat surface instead of a curved surface.

[0138] according to Figure 7 In the embodiment shown in , the display device 200 is a flexible display device having flexibility, and can be disposed in a curved shape on the first side surface SIF1 formed as a curved surface of the lens 100. Therefore, the light L of the display device 200 can travel toward the third side surface SIF3 without the light path changing layer 310, and can be totally reflected by the third side surface SIF3.

[0139] Figure 8 is a perspective view showing an optical device 10_4 according to the embodiment. Fig. 9It is shown Figure 8 1 is a perspective view of an example of a lens 100 of an optical device 10_4. Fig.10 It is shown Figure 8 A side view of an example of the optical path of the optical device 10_4. Fig.11 It is shown Figure 8 A side view of an example of the optical path of the optical device 10_4.

[0140] Figures 8 to 11 The embodiments shown in Figures 1 to 4C The embodiment shown in FIG. 1 is different in that after the light L of the display device 200 disposed on the first side surface SIF1 of the lens 100 is reflected by the reflection plate 330 disposed on the second side surface SIF2 of the lens 100 facing the first side surface SIF1, the light L is reflected by the first reflector 410 and emitted to the first surface SF1 of the lens 100. Figures 1 to 4C Overlapping descriptions of the described embodiments may be omitted, and reference may be made to Figures 8 to 11 Main description and Figures 1 to 4C The differences from the embodiment shown in .

[0141] refer to Figures 8 to 11 , the lens 100 may be formed in a decahedron shape including an octagonal first surface SF1 and a second surface SF2 and a first side surface SIF1, a second side surface SIF2, a third side surface SIF3, a fourth side surface SIF4, a fifth side surface SIF5, a sixth side surface SIF6, a seventh side surface SIF7, and an eighth side surface SIF8. When the lens 100 is as Fig. 9 When formed in a decahedral shape as shown in , the first side surface SIF1 and the second side surface SIF2 may face each other (for example, may be opposite to each other), the third side surface SIF3 may be disposed between one side of the first side surface SIF1 and one side of the second side surface SIF2, and the fourth side surface SIF4 may be disposed between the other side of the first side surface SIF1 and the other side of the second side surface SIF2. The fifth side surface SIF5 may be disposed between the first side surface SIF1 and the third side surface SIF3, and the sixth side surface SIF6 may be disposed between the second side surface SIF2 and the third side surface SIF3. The seventh side surface SIF7 may be disposed between the first side surface SIF1 and the fourth side surface SIF4, and the eighth side surface SIF8 may be disposed between the second side surface SIF2 and the fourth side surface SIF4. The first surface SF1 (which is a surface on which the user's eye E is located (or a surface near or adjacent to the user's eye E)) may be an exit surface from which the first reflector 410 emits light of the display device 200. The second surface SF2 may be an outer surface of the lens 100.

[0142] The lens 100 is not limited to Fig. 9 The lens 100 may be formed as a polyhedron having, for example, a polygonal first surface, a second surface, and a side surface. In addition to a polyhedron, the lens 100 may also be formed into other suitable shapes, such as a cylinder, an elliptical cylinder, a semicircular cylinder, a semi-elliptical cylinder, a deformed cylinder, or a deformed semicircular cylinder. The deformed cylinder and the deformed semicircular cylinder refer to cylinders and semicircular cylinders having non-constant diameters.

[0143] like Fig.10 As shown in , the light path changing layer 310 may change the path of the light L so that the light L of the display device 200 incident on the first side surface SIF1 of the lens 100 proceeds toward the second surface SF2 of the lens 100 .

[0144] Alternatively, if Fig.11 As shown in FIG, instead of the optical path changing layer 310, an inclined layer 340 for arranging the display device 200 to be inclined at a third angle θ3 relative to the first side surface SIF1 of the lens 100 may be provided between the first side surface SIF1 of the lens 100 and the display device 200. The third angle θ3 indicates an angle inclined in the second direction (Y-axis direction) relative to a direction opposite to the third direction (Z-axis direction).

[0145] The reflection plate 330 may be disposed on the second side surface SIF2 of the lens 100. One surface of the reflection plate 330 facing the second side surface SIF2 of the lens 100 may be implemented as a mirror. The reflection plate 330 may be formed flat in a first direction (X-axis direction) and a third direction (Z-axis direction).

[0146] like Figure 10 to Figure 11As shown in , the light L of the display device 200 may travel toward the second surface SF2 of the lens 100. When the refractive index of the lens 100 is greater than the refractive index of the air and the incident angle of the light L incident on the second surface SF2 of the lens 100 is greater than the critical angle, the light L of the display device 200 may be totally reflected at the second surface SF2 of the lens 100. A portion of the light L totally reflected by the second surface SF2 of the lens 100 may be totally reflected by the first surface SF1 of the lens 100. A portion of the light L totally reflected by the first surface SF1 of the lens 100 may be totally reflected again by the second surface SF2 of the lens 100. A portion of the light L totally reflected again by the second surface SF2 of the lens 100 may be reflected by the reflection plate 330 disposed on the second side surface SIF2 of the lens 100. A portion of the light L reflected by the reflection plate 330 disposed on the second side surface SIF2 of the lens 100 may be totally reflected again by the first surface SF1 of the lens 100. A portion of the light L that is totally reflected again by the first surface SF1 of the lens 100 may be emitted to the first surface SF1 of the lens 100 by the first reflector 410 and provided to the user's eye E. Therefore, even when the user focuses on the real image through the lens 100, the user can clearly view the virtual image displayed by the display device 200. That is, even when the user does not move the focus adjusted to the real image, the user can clearly view the virtual image displayed by the display device 200.

[0147] according to Figures 8 to 11 In the embodiment shown in FIG. 1 , after the light of the display device 200 disposed on the first side surface SIF1 of the lens 100 is totally reflected by at least one side surface of the lens 100, the light of the display device 200 may be emitted to the first surface SF1 of the lens 100 by the first reflector 410 and provided to the user's eye E. Therefore, the optical distance between the display device 200 and the first reflector 410 may be increased. Therefore, the depth of field of the virtual image displayed on the display device 200 may be deepened.

[0148] Fig.12 is a perspective view showing an optical device 10_5 according to the embodiment.

[0149] Fig.12 The embodiments shown in Figures 8 to 11 The embodiment shown in FIG. 1 is different in that the optical device 10_5 includes a plurality of reflectors 410 and 420. Figures 8 to 11 Overlapping descriptions of the described embodiments may be omitted, and reference may be made to Fig.12 Main description and Figures 8 to 11 The differences from the embodiment shown in .

[0150] refer to Fig.12, the optical device 10_5 includes a plurality of reflectors 410 and 420. Although Fig.12 The optical device 10_5 is shown to include two reflectors 410 and 420, but the present disclosure is not limited thereto. For example, the optical device 10_5 may include three or more reflectors. As the number of reflectors increases, the brightness of the virtual image provided to the user's eye E may increase, and the area of ​​the display device 200 viewed by the user's eye E (e.g., the user's field of view (FOV)) may be enlarged.

[0151] The optical device 10_5 may include a first reflector 410 and a second reflector 420, such as Fig.12 as shown in .

[0152] The first reflector 410 and the second reflector 420 are provided in the lens 100. The first reflector 410 and the second reflector 420 may be micro mirrors such as pin mirrors. Fig.12 The first reflector 410 and the second reflector 420 are shown to have circular cross-sections, but they may have any suitable shape, such as an elliptical or polygonal cross-section.

[0153] The first reflector 410 and the second reflector 420 are formed to be smaller in size than the pupil of the eye E. For example, each of the first reflector 410 and the second reflector 420 may be formed to have a diameter of about 500 μm to about 4 mm. In this case, since the user focuses on the real image, it is difficult to recognize the first reflector 410 and the second reflector 420. However, as the size of the first reflector 410 and the second reflector 420 is reduced, the brightness of the virtual image provided to the user's eye E by the flexible display device 200 is also reduced. Therefore, considering this fact, the size of the first reflector 410 and the second reflector 420 may be set.

[0154] like Fig.12 As shown in , the first reflector 410 and the second reflector 420 may have a cylindrical shape. In an embodiment, one of the two bottom surfaces may be a reflective surface implemented as a mirror, and the other of the two bottom surfaces and the side surface may not be implemented as a mirror. In order to emit the light L reflected from the reflective plate 330 provided on the second side surface SIF2 of the lens 100 to the first surface SF1 of the lens 100, the bottom surface of the lower portion of the first reflector 410 and the bottom surface of the lower portion of the second reflector 420 may be a reflective surface.

[0155] A portion of the light L reflected by the reflection plate 330 disposed on the second side surface SIF2 of the lens 100 may be reflected by the first reflector 410 and the second reflector 420, emitted to the first surface SF1 of the lens 100, and provided to the user's eye E. Since the virtual image displayed on the display device 200 is reflected by the first reflector 410 and the second reflector 420, its depth of field is deepened.

[0156] according to Fig.12 In the embodiment shown in , since the optical device 10_5 includes multiple reflectors 410 and 420, the brightness of the virtual image provided to the user's eye E can be increased, and the area of ​​the display device 200 viewed by the user's eye E (for example, the user's field of view (FOV)) can be enlarged compared to an embodiment in which only one reflector is provided.

[0157] Fig.13 is a perspective view showing an optical device 10_6 according to the embodiment.

[0158] Fig.13 The embodiments shown in Figures 8 to 11 The embodiment shown in FIG. 1 is different in that the second side surface SIF2 of the lens 100 is formed as a curved surface, for example, a curved surface having a predetermined curvature. Figures 8 to 11 The overlapping descriptions of the described embodiments may be omitted, and the following reference is made to Fig.13 Main description and Figures 8 to 11 The differences from the embodiment shown in .

[0159] refer to Fig.13 The second side surface SIF2 of the lens 100 may be a curved surface having a predetermined curvature. The second side surface SIF2 of the lens 100 may have a curved shape in an outward direction of the second side surface SIF2 (eg, a direction opposite to the second direction (Y-axis direction)).

[0160] Since the reflective plate 330 is disposed on the second side surface SIF2 of the lens 100, it can be arranged in a curved shape along the curvature of the second side surface SIF2 of the lens 100. Since the second side surface SIF2 of the lens 100 is curved in an outward direction of the second side surface SIF2 (for example, a direction opposite to the second direction (Y-axis direction)), the reflective plate 330 can be used as a concave mirror. Therefore, the light L of the display device 200 reflected by the reflective plate 330 disposed on the second side surface SIF2 of the lens 100 can be collected by the first reflector 410. Therefore, the brightness of the virtual image of the display device 200 provided to the user's eye E can be increased by the first reflector 410.

[0161] according to Fig.13In the embodiment shown in , since the reflective plate 330 is arranged in a curved shape on the second side surface SIF2 of the lens 100 formed as a curved surface, the reflective plate 330 can be used as a concave mirror. Therefore, the light L of the display device 200 reflected by the reflective plate 330 disposed on the second side surface SIF2 of the lens 100 can be collected by the first reflector 410. Therefore, the brightness of the virtual image of the display device 200 provided to the user's eye E can be increased by the first reflector 410.

[0162] Fig.14 is a perspective view showing an optical device 10_7 according to the embodiment.

[0163] Fig.14 The embodiments shown in Figures 8 to 11 The embodiment shown in FIG. 1 is different in that the second side surface SIF2 of the lens 100 is formed as a curved surface having a curvature (eg, a predetermined curvature). Figures 8 to 11 Overlapping descriptions of the described embodiments may be omitted, and reference may be made to Fig.14 Main description and Figures 8 to 11 The differences from the embodiment shown in .

[0164] refer to Fig.14 The second side surface SIF2 of the lens 100 may be a curved surface having a predetermined curvature. The second side surface SIF2 of the lens 100 may have a curved shape toward the center of the lens 100 (eg, in the second direction (Y-axis direction)).

[0165] Since the reflective plate 330 is disposed on the second side surface SIF2 of the lens 100, it can be arranged in a curved shape along the curvature of the second side surface SIF2 of the lens 100. Since the second side surface SIF2 of the lens 100 is curved toward the center of the lens 100 (for example, in the second direction (Y-axis direction)), the reflective plate 330 can be used as a convex mirror. Therefore, the light L of the display device 200 reflected by the reflective plate 330 disposed on the second side surface SIF2 of the lens 100 is diffused. Therefore, the virtual image of the display device 200 provided to the user's eye E by the first reflector 410 can be viewed by the user in an enlarged manner.

[0166] according to Fig.14 In the embodiment shown in FIG. 1 , since the reflective plate 330 is arranged in a curved shape on the second side surface SIF2 of the lens 100 formed as a curved surface, the reflective plate 330 can be used as a convex mirror. Therefore, the light L of the display device 200 reflected by the reflective plate 330 disposed on the second side surface SIF2 of the lens 100 can be diffused. Therefore, the virtual image of the display device 200 provided to the user's eye E by the first reflector 410 can be viewed by the user in an enlarged manner.

[0167] Fig.15 is a perspective view showing an optical device 10_8 according to the embodiment. Fig.16 It is shown Fig.15 A perspective view of an example of a lens 100 of an optical device 10_8. Fig.17 201 and 202 are perspective views illustrating examples of paths of the first light L1 of the first display device 201 and the second light L2 of the second display device 202 .

[0168] refer to Figures 15 to 17 According to the embodiment, the optical device 10_8 includes a lens 100, a first display device 201, a second display device 202, a first light path changing layer 311, a second light path changing layer 312, a first polarizing film 321, a second polarizing film 322, a first reflector 410 and a second reflector 420.

[0169] The lens 100 may be formed of glass or plastic in a transparent or translucent manner. Therefore, the user may view a real image through the lens 100. The lens 100 may have a refractive power (eg, a predetermined refractive power) in consideration of the visual acuity of the user.

[0170] like Fig.16 As shown in , the lens 100 may include a first lens portion 101, a second lens portion 102, and a third lens portion 103 disposed between the first lens portion 101 and the second lens portion 102. The first lens portion 101 may be formed as a hexahedron having an eleventh surface SF11, a twelfth surface SF12, an eleventh side surface SIF11, a twelfth side surface SIF12, a thirteenth side surface SIF13, and a fourteenth side surface SIF14, each having a rectangular shape. The second lens portion 102 may be formed as a hexahedron having a twenty-first surface SF21, a twenty-second surface SF22, a twenty-first side surface SIF21, a twenty-second side surface SIF22, a twenty-third side surface SIF23, and a twenty-fourth side surface SIF24, each having a rectangular shape. The third lens portion 103 may be formed as a hexahedron having a thirty-first surface SF31 , a thirty-second surface SF32 , a thirty-first side surface SIF31 , a thirty-second side surface SIF32 , a thirty-third side surface SIF33 , and a thirty-fourth side surface SIF34 each having a rectangular shape.

[0171] The twelfth side surface SIF12 of the first lens portion 101 may extend from one side of the eleventh side surface SIF11, and the thirteenth side surface SIF13 may extend from the other side opposite to the one side of the eleventh side surface SIF11. The fourteenth side surface SIF14 may face the eleventh side surface SIF11. The eleventh surface SF11 may be a top surface, and the twelfth surface SF12 may be a bottom surface. The eleventh surface SF1 (which is a surface on which the user's left eye LE is located (or a surface near or adjacent to the user's left eye LE)) may be an exit surface from which the first reflector 410 emits light of the second display device 202. The twelfth surface SF12 may be an outer surface of the lens 100.

[0172] The 22nd side surface SIF22 of the second lens portion 102 may extend from one side of the 21st side surface SIF21, and the 23rd side surface SIF23 may extend from the other side opposite to the one side of the 21st side surface SIF21. The 24th side surface SIF24 may face the 21st side surface SIF21. The 21st surface SF21 may be a top surface, and the 22nd surface SF22 may be a bottom surface. The 21st surface SF21 (which is a surface on which the user's right eye RE is located (or a surface near or adjacent to the user's right eye RE)) may be an exit surface from which the second reflector 420 emits light of the first display device 201. The 22nd surface SF22 may be an outer surface of the lens 100.

[0173] The thirty-third side surface SIF31 of the third lens portion 103 may extend from one side of the thirty-third side surface SIF33, and the thirty-second side surface SIF32 may extend from the other side opposite to the one side of the thirty-third side surface SIF33. The thirty-fourth side surface SIF34 may face the thirty-third side surface SIF33. The thirty-first surface SF31 may be a top surface, and the thirty-second surface SF32 may be a bottom surface.

[0174] The fourteenth side surface SIF14 of the first lens portion 101 may contact the thirty-third side surface SIF33 of the third lens portion 103. The twenty-fourth side surface SIF24 of the second lens portion 102 may contact the thirty-fourth side surface SIF34 of the third lens portion 103.

[0175] Although Fig.16The first lens portion 101, the second lens portion 102, and the third lens portion 103 of the lens 100 are shown to be formed as a hexahedron, but the embodiments of the present disclosure are not limited thereto. For example, each of the first lens portion 101, the second lens portion 102, and the third lens portion 103 of the lens 100 may be formed as a polyhedron having a polygonal first surface, a second surface, and a side surface. In addition to the polyhedron, each of the first lens portion 101, the second lens portion 102, and the third lens portion 103 of the lens 100 may be formed into other suitable shapes, such as a cylinder, an elliptical cylinder, a semicircular cylinder, a semi-elliptical cylinder, a deformed cylinder, or a deformed semicircular cylinder. The deformed cylinder and the deformed semicircular cylinder refer to a cylinder and a semicircular cylinder having a non-constant diameter.

[0176] The first reflector 410 is disposed in the first lens portion 101 of the lens 100. The second reflector 420 is disposed in the second lens portion 102 of the lens 100. The first reflector 410 and the second reflector 420 may be micro mirrors such as pin mirrors. Fig.15 The first reflector 410 and the second reflector 420 are shown to have circular cross-sections, but they may have any suitable shape, such as an elliptical or polygonal cross-section.

[0177] The first reflector 410 and the second reflector 420 are formed to be smaller in size than the pupil of the eye E. For example, each of the first reflector 410 and the second reflector 420 may be formed to have a diameter of about 500 μm to about 4 mm. In an embodiment, since the user focuses on the real image, it is difficult to recognize the first reflector 410 and the second reflector 420. However, as the size of the first reflector 410 and the second reflector 420 is reduced, the brightness of the virtual image provided to the user's eyes LE, RE by the flexible display device 201, 202 is also reduced. Therefore, considering this fact, the size of the first reflector 410 and the second reflector 420 may be set.

[0178] like Fig.15 As shown in , the first reflector 410 and the second reflector 420 may have a cylindrical shape. In an embodiment, one of the two bottom surfaces may be a reflective surface implemented as a mirror, and the other of the two bottom surfaces and the side surface may not be implemented as a mirror. Fig.17 As shown in , in order to emit the second light L2 totally reflected from the thirty-side surface SIF31 of the third lens portion 103 of the lens 100 to the eleventh surface SF11 of the first lens portion 101, the bottom surface of the upper portion of the first reflector 410 may be a reflective surface. Further, as Fig.17As shown in FIG. , in order to emit the first light L1 totally reflected from the thirty-side surface SIF31 of the third lens portion 103 of the lens 100 to the twenty-first surface SF21 of the second lens portion 102 , the bottom surface of the upper portion of the second reflector 420 may be a reflective surface.

[0179] The first reflector 410 may reflect the virtual image displayed on the second display device 202 and provide the virtual image to the left eye LE of the user. The second reflector 420 may reflect the virtual image displayed on the first display device 201 and provide the virtual image to the right eye RE of the user. Since the virtual image displayed on the first display device 201 is reflected by the second reflector 420, its depth of field is deepened. Since the virtual image displayed on the second display device 202 is reflected by the first reflector 410, its depth of field is deepened.

[0180] Each of the first display device 201 and the second display device 202 displays a virtual image for realizing augmented reality. The first display device 201 may be disposed on one of the side surfaces of the first lens portion 101, and the second display device 202 may be disposed on one of the side surfaces of the second lens portion 102. For example, the display devices 201, 202 may be disposed on the eleventh side surface SIF11 of the first lens portion 101, and may be disposed on the twenty-first side surface SIF21 of the second lens portion 102.

[0181] The first circuit board 211 is attached to one end of the first display device 201. Alternatively, the first circuit board 211 may be attached to the other end of the first display device 201. Alternatively, when there are many signal lines and voltage lines for driving the first display device 201, two first circuit boards 211 may be attached to one end and the other end of the first display device 201, respectively.

[0182] The second circuit board 212 is attached to one end of the second display device 202. Alternatively, the second circuit board 212 may be attached to the other end of the second display device 202. Alternatively, when there are many signal lines and voltage lines for driving the second display device 202, two second circuit boards 212 may be attached to one end and the other end of the second display device 202, respectively.

[0183] Each of the first circuit board 211 and the second circuit board 212 may be a flexible printed circuit board.

[0184] The first integrated driving circuit 221 may be mounted on the first circuit board 211. The second integrated driving circuit 222 may be mounted on the second circuit board 212. The first integrated driving circuit 221 may supply a data voltage, a scan control signal, a source voltage, etc. for driving the first display device 201 to the first display device 201. The second integrated driving circuit 222 may supply a data voltage, a scan control signal, a source voltage, etc. for driving the second display device 202 to the second display device 202. The first integrated driving circuit 221 and the second integrated driving circuit 222 may be integrated circuits.

[0185] The first optical path changing layer 311 may be disposed between the eleventh side surface SIF11 of the first lens portion 101 and the first display device 201. Fig.17 As shown in FIG. , the first optical path changing layer 311 may change the path of the first light L1 so that the first light L1 of the first display device 201 incident on the eleventh side surface SIF11 of the first lens portion 101 proceeds toward the twelfth side surface SIF12 of the first lens portion 101 .

[0186] The second optical path changing layer 312 may be disposed between the twenty-first side surface SIF21 of the second lens portion 102 and the second display device 202. Fig.17 As shown in , the second optical path changing layer 312 may change the path of the second light L2 so that the second light L2 of the second display device 202 incident on the twenty-first side surface SIF21 of the second lens portion 102 proceeds toward the twenty-second side surface SIF22 of the second lens portion 102 .

[0187] The first light path changing layer 311 and the second light path changing layer 312 may be as described above with reference to FIG. 4A to FIG. 4C Description to achieve.

[0188] The first polarizing film 321 may be disposed between the eleventh side surface SIF11 of the first lens section 101 and the first optical path changing layer 311. The second polarizing film 322 may be disposed between the twenty-first side surface SIF21 of the second lens section 102 and the second optical path changing layer 312.

[0189] Each of the first polarizing film 321 and the second polarizing film 322 may include a linear polarizing plate and a phase retardation film such as a quarter wave (λ / 4) plate. In the case of the first polarizing film 321, the linear polarizing plate may be disposed on the eleventh side surface SIF11 of the first lens portion 101, and the phase retardation film may be disposed between the linear polarizing plate and the first optical path changing layer 311. Therefore, the first polarizing film 321 may prevent the light from the eleventh side surface SIF11 of the first lens portion 101 from being reflected by the first display device 201 and emitted to the eleventh side surface SIF11 of the first lens portion 101, or may reduce the possibility thereof while allowing the first light L1 of the first display device 201 to travel to the eleventh side surface SIF11 of the first lens portion 101.

[0190] In an embodiment including the second polarizing film 322, a linear polarizing plate may be disposed on the twenty-first side surface SIF21 of the second lens portion 102, and a phase retardation film may be disposed between the linear polarizing plate and the second optical path changing layer 312. Therefore, the second polarizing film 322 may prevent light from the twenty-first side surface SIF21 of the second lens portion 102 from being reflected by the second display device 202 and emitted to the twenty-first side surface SIF21 of the second lens portion 102, or may reduce the possibility thereof, while allowing the second light L2 of the second display device 202 to travel to the twenty-first side surface SIF21 of the second lens portion 102.

[0191] like Fig.17 As shown in , the first light L1 of the first display device 201 may travel toward the twelfth side surface SIF12 of the first lens portion 101 through the first optical path changing layer 311. When the refractive index of the lens 100 is greater than the refractive index of the air and the incident angle of the first light L1 incident on the twelfth side surface SIF12 of the first lens portion 101 is greater than the critical angle, a portion of the first light L1 of the first display device 201 may be totally reflected by the twelfth side surface SIF12 of the first lens portion 101. A portion of the first light L1 totally reflected by the twelfth side surface SIF12 of the first lens portion 101 may be totally reflected by the thirty-second side surface SIF32 of the third lens portion 103. A portion of the first light L1 totally reflected by the thirty-second side surface SIF32 of the third lens portion 103 may be totally reflected by the thirty-first side surface SIF31 of the third lens portion 103. A portion of the first light L1 totally reflected by the thirty-side surface SIF31 of the third lens part 103 may be emitted to the twenty-first surface SF21 of the second lens part 102 by the second reflector 420 and provided to the right eye RE of the user.

[0192] Further, if Fig.17As shown in , the second light L2 of the second display device 202 may travel toward the twenty-second side surface SIF22 of the second lens portion 102 through the second optical path changing layer 312. When the refractive index of the lens 100 is greater than the refractive index of the air and the incident angle of the second light L2 incident on the twenty-second side surface SIF22 of the second lens portion 102 is greater than the critical angle, a portion of the second light L2 of the second display device 202 may be totally reflected by the twenty-second side surface SIF22 of the second lens portion 102. A portion of the second light L2 totally reflected by the twenty-second side surface SIF22 of the second lens portion 102 may be totally reflected by the thirty-second side surface SIF32 of the third lens portion 103. A portion of the second light L2 totally reflected by the thirty-second side surface SIF32 of the third lens portion 103 may be totally reflected by the thirty-second side surface SIF31 of the third lens portion 103. A portion of the second light L2 totally reflected by the thirty-side surface SIF31 of the third lens part 103 may be emitted to the eleventh surface SF11 of the first lens part 101 by the first reflector 410 and provided to the left eye LE of the user.

[0193] Fig.17 It is shown that after the first light L1 of the first display device 201 is totally reflected three times by, for example, the twelfth side surface SIF12 of the first lens portion 101 and the thirty-first side surface SIF31 and the thirty-second side surface SIF32 of the third lens portion 103, the first light L1 is reflected by the second reflector 420, emitted to the twenty-first surface SF21 of the second lens portion 102, and provided to the right eye RE of the user. Further, Fig.17It is shown that after the second light L2 of the second display device 202 is totally reflected three times by, for example, the 22nd side surface SIF22 of the second lens portion 102 and the 31st side surface SIF31 and the 32nd side surface SIF32 of the third lens portion 103, the second light L2 is reflected by the first reflector 410, emitted to the 11th surface SF11 of the first lens portion 101, and provided to the left eye LE of the user. However, the number of total reflections of the first light L1 of the first display device 201 and the number of total reflections of the second light L2 of the second display device 202 are not limited thereto. As the number of total reflections of the first light L1 of the first display device 201 increases, the depth of the virtual image displayed on the first display device 201 may be deepened. However, since the loss of the first light L1 of the first display device 201 increases, the brightness of the virtual image of the first display device 201 provided to the right eye RE of the user may be reduced. As the number of total reflections of the second light L2 of the second display device 202 increases, the depth of the virtual image displayed on the second display device 202 may be deepened. However, due to the increased loss of the second light L2 of the second display device 202, the brightness of the virtual image of the second display device 202 provided to the left eye LE of the user may be reduced. Therefore, the number of total reflections of the first light L1 of the first display device 201 and the number of total reflections of the second light L2 of the second display device 202 may be set in consideration of the depth of field of the virtual image displayed on the first display device 201 and the second display device 202, the brightness of the virtual image of the first display device 201 provided on the right eye RE of the user, and the brightness of the virtual image of the second display device 202 provided in the left eye LE of the user.

[0194] At the same time, in order to make the first light L1 of the first display device 201 and the second light L2 of the second display device 202 totally reflected at the thirty-second side surface SIF31 and the thirty-second side surface SIF32 of the third lens portion 103, the length of the third lens portion 103 in the first direction (X-axis direction) can be longer than the length of the first lens portion 101 in the first direction (X-axis direction) and the length of the second lens portion 102 in the first direction (X-axis direction).

[0195] according to Figures 15 to 17In the embodiment shown in , after the first light L1 of the first display device 201 disposed on the eleventh side surface SIF11 of the first lens portion 101 is totally reflected by at least one side surface of the third lens portion 103 connecting the first lens portion 101 and the second lens portion 102, the first light L1 may be emitted to the twenty-first surface SF21 of the second lens portion 102 by the second reflector 420 disposed in the second lens portion 102, and provided to the right eye RE of the user. Further, after the second light L2 of the second display device 202 disposed on the twenty-first side surface SIF21 of the second lens portion 102 is totally reflected by at least one side surface of the third lens portion 103, the second light L2 may be emitted to the eleventh surface SF11 of the first lens portion 101 by the first reflector 410 disposed in the first lens portion 101, and provided to the left eye LE of the user. Therefore, the optical distance between the first display device 201 and the second reflector 420 and the optical distance between the second display device 202 and the first reflector 410 may be increased. Therefore, the depth of field of the virtual image displayed on the first display device 201 and the depth of field of the virtual image displayed on the second display device 202 may be deepened.

[0196] FIG. 18A to FIG. 18B is a perspective view showing an optical device 10_9 according to the embodiment.

[0197] FIG. 18A to FIG. 18B The embodiments shown in Figures 15 to 17 The difference of the embodiment shown in FIG. 1 is that the optical device 10_9 further includes a third reflector 430 disposed adjacent to the first reflector 410 and a fourth reflector 440 disposed adjacent to the second reflector 420. Figures 15 to 17 Overlapping descriptions of the described embodiments may be omitted, and reference may be made to FIG. 18A to FIG. 18B Main description and Figures 15 to 17 The differences from the embodiment shown in .

[0198] refer to FIG. 18A to FIG. 18B The optical device 10_9 further includes a third reflector 430 disposed adjacent to the first reflector 410 and a fourth reflector 440 disposed adjacent to the second reflector 420. Meanwhile, the number of reflectors of the optical device 10_9 is not limited to FIG. 18A to FIG. 18B As the number of reflectors in the optical device 10_9 increases, the brightness of the virtual image provided to the user's left eye LE and the user's right eye RE can be increased, and the area of ​​the display devices 201, 202 viewed by the user's left eye LE and the user's right eye RE (e.g., the user's field of view (FOV)) can be enlarged.

[0199] The third reflector 430 is disposed in the first lens portion 101 of the lens 100. The fourth reflector 440 is disposed in the second lens portion 102 of the lens 100. The third reflector 430 and the fourth reflector 440 may be micro mirrors such as pin mirrors. FIG. 18A to FIG. 18B The third reflector 430 and the fourth reflector 440 are shown to have circular cross-sections, but the third reflector 430 and the fourth reflector 440 may have any suitable shape, such as an elliptical or polygonal cross-section.

[0200] The third reflector 430 and the fourth reflector 440 are formed to be smaller in size than the pupil of the eyes LE, RE. For example, each of the third reflector 430 and the fourth reflector 440 may be formed to have a diameter of about 500 μm to about 4 mm. In an embodiment, since the user focuses on the real image, it is difficult to identify the third reflector 430 and the fourth reflector 440. However, as the size of the third reflector 430 and the fourth reflector 440 is reduced, the brightness of the virtual image provided to the user's eyes LE, RE by the flexible display device 201, 202 is also reduced. Therefore, considering this fact, the size of the third reflector 430 and the fourth reflector 440 may be set.

[0201] The third reflector 430 and the fourth reflector 440 may have a cylindrical shape, such as FIG. 18A to FIG. 18B In an embodiment, one of the two bottom surfaces may be a reflective surface implemented as a mirror, and the other of the two bottom surfaces and the side surface are not implemented as mirrors. FIG. 18A to FIG. 18B As shown in , in order to emit the second light L2 totally reflected from the thirty-side surface SIF31 of the third lens portion 103 of the lens 100 to the eleventh surface SF11 of the first lens portion 101, the bottom surface of the upper portion of the third reflector 430 may be a reflective surface. Further, as FIG. 18A to FIG. 18B As shown in FIG. , in order to emit the first light L1 totally reflected from the thirty-side surface SIF31 of the third lens portion 103 of the lens 100 to the twenty-first surface SF21 of the second lens portion 102 , the bottom surface of the upper portion of the fourth reflector 440 may be a reflective surface.

[0202] The third reflector 430 may reflect the virtual image displayed on the second display device 202 and provide the virtual image to the left eye LE of the user. The fourth reflector 440 may reflect the virtual image displayed on the first display device 201 and provide the virtual image to the right eye RE of the user. Since the virtual image displayed on the first display device 201 is reflected by the fourth reflector 440, the depth of field is deepened. Since the virtual image displayed on the second display device 202 is reflected by the third reflector 430, the depth of field is deepened.

[0203] like Fig.18A As shown in , the first light L1 of the first display device 201 may travel toward the twelfth side surface SIF12 of the first lens portion 101 through the first optical path changing layer 311. When the refractive index of the lens 100 is greater than the refractive index of the air and the incident angle of the first light L1 incident on the twelfth side surface SIF12 of the first lens portion 101 is greater than the critical angle, a portion of the first light L1 of the first display device 201 may be totally reflected by the twelfth side surface SIF12 of the first lens portion 101. A portion of the first light L1 totally reflected by the twelfth side surface SIF12 of the first lens portion 101 may be totally reflected by the thirty-second side surface SIF32 of the third lens portion 103. A portion of the first light L1 totally reflected by the thirty-second side surface SIF32 of the third lens portion 103 may be totally reflected by the thirty-first side surface SIF31 of the third lens portion 103. A portion of the first light L1 totally reflected by the thirty-side surface SIF31 of the third lens part 103 may be emitted to the twenty-first surface SF21 of the second lens part 102 by the second reflector 420 and the fourth reflector 440 and provided to the right eye RE of the user.

[0204] Further, if Fig.18B As shown in , the second light L2 of the second display device 202 may travel toward the twenty-second side surface SIF22 of the second lens portion 102 through the second optical path changing layer 312. When the refractive index of the lens 100 is greater than the refractive index of the air and the incident angle of the second light L2 incident on the twenty-second side surface SIF22 of the second lens portion 102 is greater than the critical angle, a portion of the second light L2 of the second display device 202 may be totally reflected by the twenty-second side surface SIF22 of the second lens portion 102. A portion of the second light L2 totally reflected by the twenty-second side surface SIF22 of the second lens portion 102 may be totally reflected by the thirty-second side surface SIF32 of the third lens portion 103. A portion of the second light L2 totally reflected by the thirty-second side surface SIF32 of the third lens portion 103 may be totally reflected by the thirty-second side surface SIF31 of the third lens portion 103. A portion of the second light L2 totally reflected by the thirty-side surface SIF31 of the third lens part 103 may be emitted to the eleventh surface SF11 of the first lens part 101 by the first reflector 410 and the third reflector 430 and provided to the left eye LE of the user.

[0205] according to FIG. 18A to FIG. 18BIn the embodiment shown in , since each of the first lens portion 101 and the second lens portion 102 includes a plurality of reflectors, the brightness of the virtual image provided to the user's left eye LE and the user's right eye RE can be increased, and the area of ​​the display devices 201, 202 viewed by the user's left eye LE and the user's right eye RE (for example, the user's field of view (FOV)) can be enlarged compared to an embodiment in which only one reflector is provided.

[0206] Fig.19 is a perspective view showing an optical device 10_10 according to an embodiment.

[0207] Fig.19 The embodiments shown in Figures 15 to 17 The embodiment shown in FIG. 1 is different in that the first reflection plate 331 is disposed on the twelfth side surface SIF12 of the first lens portion 101, the twenty-second side surface SIF22 of the second lens portion 102, and the thirty-second side surface SIF31 of the third lens portion 103, and the second reflection plate 333 is disposed on the thirty-second side surface SIF32 of the third lens portion 103. Figures 15 to 17 Overlapping descriptions of the described embodiments may be omitted, and reference may be made to Fig.19 Main description and Figures 15 to 17 The differences from the embodiment shown in .

[0208] refer to Fig.19 , the optical device 10_10 further includes a first reflection plate 331 disposed on the twelfth side surface SIF12 of the first lens portion 101, the 22nd side surface SIF22 of the second lens portion 102, and the 32nd side surface SIF31 of the third lens portion 103, and a second reflection plate 333 disposed on the 32nd side surface SIF32 of the third lens portion 103. One surface of the first reflection plate 331 facing the twelfth side surface SIF12 of the first lens portion 101, the 22nd side surface SIF22 of the second lens portion 102, and the 32nd side surface SIF31 of the third lens portion 103 may be implemented as a mirror. One surface of the second reflection plate 333 facing the 32nd side surface SIF32 of the third lens portion 103 may be implemented as a mirror.

[0209] The first light L1 of the first display device 201 may travel toward the twelfth side surface SIF12 of the first lens portion 101 through the first optical path changing layer 311. The first light L1 of the first display device 201 may be reflected by the first reflection plate 331 disposed on the twelfth side surface SIF12 of the first lens portion 101. A portion of the first light L1 reflected by the first reflection plate 331 disposed on the twelfth side surface SIF12 of the first lens portion 101 may be reflected by the second reflection plate 333 disposed on the thirty-second side surface SIF32 of the third lens portion 103. A portion of the first light L1 reflected by the second reflection plate 333 disposed on the thirty-second side surface SIF32 of the third lens portion 103 may be reflected by the first reflection plate 331 disposed on the thirty-second side surface SIF31 of the third lens portion 103. A portion of the first light L1 reflected by the first reflection plate 331 disposed on the thirty-second side surface SIF31 of the third lens portion 103 may be emitted to the twenty-first surface SF21 of the second lens portion 102 through the second reflector 420 and provided to the right eye RE of the user.

[0210] Further, the second light L2 of the second display device 202 may travel toward the twenty-second side surface SIF22 of the second lens portion 102 through the second optical path changing layer 312. A portion of the second light L2 of the second display device 202 may be reflected by the first reflection plate 331 disposed on the twenty-second side surface SIF22 of the second lens portion 102. A portion of the second light L2 reflected by the first reflection plate 331 disposed on the twenty-second side surface SIF22 of the second lens portion 102 may be reflected by the second reflection plate 333 disposed on the thirty-second side surface SIF32 of the third lens portion 103. A portion of the second light L2 reflected by the second reflection plate 333 disposed on the thirty-second side surface SIF32 of the third lens portion 103 may be reflected by the first reflection plate 331 disposed on the thirty-second side surface SIF31 of the third lens portion 103. A portion of the second light L2 totally reflected by the thirty-second side surface SIF31 of the third lens portion 103 may be emitted to the eleventh surface SF11 of the first lens portion 101 by the first reflector 410 and provided to the left eye LE of the user.

[0211] Total reflection occurs only when the incident angle is greater than the critical angle, and the first reflective plate 331 and the second reflective plate 333 almost completely reflect the incident light. Therefore, compared with the embodiment including total reflection, in the embodiment including the first reflective plate 331 and the second reflective plate 333, the ratio of reflected light to incident light can be increased.

[0212] according to Fig.19In the embodiment shown in FIG. 1 , the first light L1 of the first display device 201 and the second light L2 of the second display device 202 are reflected by the first reflection plate 331 disposed on the twelfth side surface SIF12 of the first lens portion 101, the 22nd side surface SIF22 of the second lens portion 102, and the 31st side surface SIF31 of the third lens portion 103, and are reflected by the second reflection plate 333 disposed on the 32nd side surface SIF32 of the third lens portion 103. The brightness of the virtual images of the first display device 201 and the second display device 202 provided to the left eye LE and the right eye RE of the user can be increased.

[0213] Fig. 20 is a perspective view showing an optical device 10_11 according to an embodiment.

[0214] Fig. 20 The embodiments shown in Figures 15 to 17 The embodiment shown in FIG. 1 is different in that the eleventh side surface SIF11 of the first lens portion 101 and the twenty-first side surface SIF21 of the second lens portion 102 are formed as curved surfaces having a predetermined curvature. Figures 15 to 17 Overlapping descriptions of the described embodiments may be omitted, and reference may be made to Fig. 20 Main description and Figures 15 to 17 The differences from the embodiment shown in .

[0215] refer to Fig. 20 , the eleventh side surface SIF11 of the first lens portion 101 and the twenty-first side surface SIF21 of the second lens portion 102 may be curved surfaces, for example, curved surfaces having a predetermined curvature. The eleventh side surface SIF11 of the first lens portion 101 may have a curved shape in an outward direction (for example, a first direction (X-axis direction)) of the eleventh side surface SIF11. The twenty-first side surface SIF21 of the second lens portion 102 may have a curved shape in an outward direction (for example, a direction opposite to the first direction (X-axis direction)) of the twenty-first side surface SIF21. Therefore, a portion of the eleventh side surface SIF11 of the first lens portion 101 may face a portion of the twelfth side surface SIF12. A portion of the twenty-first side surface SIF21 of the second lens portion 102 may face a portion of the twenty-second side surface SIF22.

[0216] The first display device 201 may be a flexible display device having flexibility, which may be bent. Therefore, the first display device 201 may be arranged in a curved shape on the eleventh side surface SIF11 of the first lens portion 101 formed as a curved surface. Further, since a portion of the eleventh side surface SIF11 of the first lens portion 101 may face a portion of the twelfth side surface SIF12, the first light L1 of the first display device 201 may travel toward the twelfth side surface SIF12 without the first optical path changing layer 311, and may be totally reflected by the twelfth side surface SIF12. Therefore, the first optical path changing layer 311 may be omitted.

[0217] The second display device 202 may be a flexible display device having flexibility, which may be bent. Therefore, the second display device 202 may be arranged in a curved shape on the twenty-first side surface SIF21 of the second lens portion 102 formed as a curved surface. Further, since a portion of the twenty-first side surface SIF21 of the second lens portion 102 may face a portion of the twenty-second side surface SIF22, the second light L2 of the second display device 202 may travel toward the twenty-second side surface SIF22 without the second optical path changing layer 312, and may be totally reflected by the twenty-second side surface SIF22. Therefore, the second optical path changing layer 312 may be omitted.

[0218] Although Fig. 20 It is shown that the eleventh side surface SIF11 of the first lens portion 101 and the twenty-first side surface SIF21 of the second lens portion 102 are formed as curved surfaces, but the present disclosure is not limited thereto. For example, when the length of the thirteenth side surface SIF13 of the first lens portion 101 in the first direction (X-axis direction) is shorter than the length of the twelfth side surface SIF12 in the first direction (X-axis direction), the eleventh side surface SIF11 may be arranged obliquely so that a portion of the eleventh side surface SIF11 of the first lens portion 101 may face a portion of the twelfth side surface SIF12. The first light L1 of the first display device 201 may travel toward the twelfth side surface SIF12 without the first optical path changing layer 311, and may be totally reflected by the twelfth side surface SIF12. In an embodiment, the eleventh side surface SIF11 of the first lens portion 101 may be formed as a flat surface instead of a curved surface.

[0219] Further, when the length of the twenty-third side surface SIF23 of the second lens portion 102 in the first direction (X-axis direction) is shorter than the length of the twenty-second side surface SIF22 in the first direction (X-axis direction), the twenty-first side surface SIF21 may be arranged obliquely so that a portion of the twenty-first side surface SIF21 of the second lens portion 102 may face a portion of the twenty-second side surface SIF22. The second light L2 of the second display device 202 may travel toward the twenty-second side surface SIF22 without the second optical path changing layer 312, and may be totally reflected by the twenty-second side surface SIF22. In an embodiment, the twenty-first side surface SIF21 of the second lens portion 102 may be formed as a flat surface instead of a curved surface.

[0220] according to Fig. 20 In the embodiment shown in , each of the first display device 201 and the second display device 202 is formed as a flexible display device having flexibility. The first display device 201 can be arranged in a curved shape on the eleventh side surface SIF11 of the first lens portion 101 formed as a curved surface. The second display device 202 can be arranged in a curved shape on the twenty-first side surface SIF21 of the second lens portion 102 formed as a curved surface. Therefore, the first light L1 of the first display device 201 can travel toward the twelfth side surface SIF12 without the first optical path changing layer 311, and can be totally reflected by the twelfth side surface SIF12. Further, the second light L2 of the second display device 202 can travel toward the twenty-second side surface SIF22 without the second optical path changing layer 312, and can be totally reflected by the twenty-second side surface SIF22.

[0221] Fig.21 1 is an exemplary diagram showing a glasses-type display device 1 including an optical device according to various embodiments. Fig.21 It is shown that the optical devices 10 a and 10 b according to the embodiment of the present disclosure may be applied to the glasses-type display device 1 .

[0222] refer to Fig.21 , the glasses-type display device 1 may include a first optical device 10a, a second optical device 10b, a support frame 20, and glasses legs 30a and 30b. Fig.21 The glasses-type display device 1 including the temples 30a and 30b is shown, but the optical devices 10a and 10b according to the embodiments of the present disclosure may be applied to, for example, a head-mounted display including a head-mounted band that can be mounted on the head instead of the temples 30a and 30b.

[0223] Examples to which the optical device is applied are not limited to Fig.21Rather, the examples shown in the drawings may be applied to various other electronic devices in various forms.

[0224] Although the preferred embodiments of the present disclosure have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the disclosure as disclosed in the accompanying claims.

Claims

1. An optical device, comprising: A lens comprising a first surface and a plurality of side surfaces; A display device, located on a first side surface among the plurality of side surfaces, the display device being configured to provide light to the first side surface; as well as a first reflector located in the lens and configured to reflect the light provided by the display device to the first surface after the light is reflected from a second side surface among the plurality of side surfaces, wherein the light provided by the display device is reflected by a third side surface among the plurality of side surfaces to travel toward a fourth side surface among the plurality of side surfaces, and is reflected by the fourth side surface to travel toward the second side surface, and wherein the third side surface extends from the first side of the first side surface, and The fourth side surface is located between the second side surface and the third side surface.

2. The optical device according to claim 1 further comprises an optical path changing component located between the first side surface and the display device, wherein the optical path changing component is configured to change the path of the light provided by the display device so that the light provided by the display device travels toward the third side surface.

3. The optical device according to claim 2, wherein the optical path changing member comprises: basal layer; a first light exiting surface inclined at a first angle from the base layer; as well as A second light exiting surface is formed at a second angle with respect to the base layer, The first angle is smaller than the second angle. 4 . The optical device according to claim 2 , further comprising a polarizing film between the first side surface and the light path changing member. 5 . The optical device according to claim 1 , further comprising a reflection plate on the second side surface, the third side surface, and the fourth side surface.

6. The optical device according to claim 1, wherein the first side surface has a curved shape, and The display device has a curved shape on the first side surface. 7 . The optical device according to claim 1 , further comprising a second reflector located in the lens and configured to reflect the light provided by the display device to the first surface after the light is reflected from the second side surface.

8. An optical device comprising: A lens comprising a first surface and a plurality of side surfaces; A display device, located on a first side surface among the plurality of side surfaces, the display device being configured to provide light to the first side surface; a first reflector located in the lens and configured to reflect the light provided by the display device to the first surface after the light is reflected from a second side surface among the plurality of side surfaces; as well as an optical path changing member located between the first side surface and the display device and contacting the display device, the optical path changing member being configured to change a path of the light provided by the display device so that the light provided by the display device travels toward a second surface opposite to the first surface, wherein the first side surface and the second side surface face away from each other, wherein the first side surface has a curved shape, and The display device has a curved shape corresponding to the curved shape of the first side surface. 9 . The optical device according to claim 8 , further comprising a reflection plate located on the second side surface of the lens.

10. The optical device according to claim 9, wherein the second side surface is curved outwardly, and The reflection plate has a curved shape on the second side surface.

11. The optical device according to claim 9, wherein the second side surface is curved toward the center of the lens, and The reflection plate has a curved shape on the second side surface.

12. An optical device according to claim 8, wherein the light provided by the display device is incident on the first side surface, reflected by the second surface to proceed toward the first surface, reflected by the first surface to proceed toward the second surface, reflected by the second surface to proceed toward the second side surface, reflected by the second side surface to proceed toward the first surface, and reflected by the first surface to proceed toward the first reflector.

13. An optical device comprising: A lens comprising a first lens portion, a second lens portion and a third lens portion, wherein the third lens portion is located between the first lens portion and the second lens portion; a first display device located on a first side surface of the first lens portion, the first display device being configured to provide a first light to the first side surface of the first lens portion; a second display device located on the first side surface of the second lens portion, the second display device being configured to provide a second light to the first side surface of the second lens portion; a first reflector located in the first lens portion and configured to reflect the second light reflected from the first side surface of the third lens portion to the first surface of the first lens portion; as well as A second reflector is located in the second lens portion and is configured to reflect the first light reflected from the first side surface of the third lens portion to the first surface of the second lens portion.

14. An optical device according to claim 13, wherein the first light of the first display device is incident on the first side surface of the first lens portion, is reflected by the second side surface of the first lens portion to proceed toward the second side surface of the third lens portion, is reflected by the second side surface of the third lens portion to proceed toward the first side surface of the third lens portion, and is reflected by the first side surface of the third lens portion to proceed toward the second reflector.

15. The optical device according to claim 14, wherein the first side surface of the third lens portion is located between the second side surface of the first lens portion and the second side surface of the second lens portion, and wherein the second side surface of the third lens portion is a surface opposite to the first side surface of the third lens portion.

16. The optical device according to claim 15, further comprising a first reflection plate located on the second side surface of the first lens portion, the second side surface of the second lens portion, and the first side surface of the third lens portion; and A second reflecting plate is located on the second side surface of the third lens portion.

17. The optical device according to claim 14 further includes a first optical path changing component located between the first side surface of the first lens part and the first display device, and the first optical path changing component is configured to change the path of the first light of the first display device so that the first light of the first display device travels toward the second side surface of the first lens part.

18. An optical device according to claim 17, wherein the second light of the second display device is incident on the first side surface of the second lens portion, is reflected by the second side surface of the second lens portion to proceed toward the second side surface of the third lens portion, is reflected by the second side surface of the third lens portion to proceed toward the first side surface of the third lens portion, and is reflected by the first side surface of the third lens portion to proceed toward the first reflector.

19. The optical device according to claim 18 further comprises a second optical path changing component located between the first side surface of the second lens portion and the second display device, the second optical path changing component being configured to change the path of the second light of the second display device so that the second light of the second display device travels toward the second side surface of the second lens portion.

20. The optical device according to claim 13, wherein the first side surface of the first lens portion has a curved shape, and Wherein the first display device has a curved shape on the first side surface of the first lens portion.

21. The optical device according to claim 13, wherein the first side surface of the second lens portion has a curved shape, and Wherein the second display device has a curved shape on the first side surface of the second lens portion.

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