Display device

Abstract

A display device includes: a display panel including a light emitting layer; an optical layer disposed on the display panel; and an optical lens disposed on the optical layer and including an optical lens phase retardation layer in which circularly polarized light provided from the optical layer is converted into linearly polarized light. The optical layer includes: a first phase retardation layer disposed on the display panel; a selective reflection layer disposed on the first phase retardation layer and configured to output linearly polarized light by transmitting light coincident with the polarization axis and to reflect light not coincident with the polarization axis; and a second phase retardation layer disposed on the selective reflection layer, in which linearly polarized light incident from the selective reflection layer is converted into circularly polarized light.

Description

Technical Field

[0001] The present disclosure herein relates to a display device for reliably producing images. Background Art

[0002] Augmented reality generally involves the display of a single image including a virtual image superimposed on a real image visible to the user's eyes. The augmented reality image can be displayed by using a head-mounted display (HMD), a head-up display (HUD), etc. When the augmented reality image is displayed by using a head-mounted display, the head-mounted display can be provided in the form of lenses (or glasses) that can be easily carried, put on, or taken off by the user.

[0003] Head-mounted displays typically reduce the distance between the viewer's eyes and the display and may block the field of view. In some cases, it may be difficult for a head-mounted display to meet the performance requirements for displaying augmented reality images. To address these issues, head-mounted displays may use microdisplays that may be smaller than typical displays. Microdisplays typically include lenses with short focal lengths. In addition, microdisplays typically have small pixels. The short focal length and small pixels of a microdisplay may make it possible for the optical portion of the head-mounted display to have an increased spatial resolution. Utility Model Content

[0004] The present disclosure provides a display device capable of reducing light loss and the occurrence of ghost images.

[0005] An embodiment of the present disclosure provides a display device, including: a display panel including a light-emitting layer; an optical layer disposed on the display panel; and an optical lens disposed on the optical layer and including an optical lens phase delay layer in which circularly polarized light provided from the optical layer is converted into linearly polarized light, wherein the optical layer includes: a first phase delay layer disposed on the display panel; a selective reflection layer disposed on the first phase delay layer and configured to output linearly polarized light by transmitting light coinciding with a polarization axis and reflect light that does not coincide with the polarization axis; and a second phase delay layer disposed on the selective reflection layer, in which the linearly polarized light incident from the selective reflection layer is converted into circularly polarized light.

[0006] In an embodiment, the optical lens may include a reflective mirror disposed on the optical layer.

[0007] In an embodiment, the optical layer may include a polarizing layer disposed between the selective reflection layer and the second phase retardation layer.

[0008] In an embodiment, the polarization layer may include a linear polarizer that linearly polarizes incident light, and absorbs light reflected by the reflector.

[0009] In an embodiment, an angle at which an optical axis of the first phase retardation layer and a polarization axis of the polarization layer cross each other may be about 45°.

[0010] In embodiments, the reflector may include a focusing lens to control the focal length.

[0011] In an embodiment, the optical lens may further include a wire grid polarization layer disposed on the optical lens phase retardation layer.

[0012] In an embodiment, the selective reflection layer may include a first protective coating layer, a reflective film layer, and a second protective coating layer stacked in sequence, and the reflective film layer includes a plurality of layers respectively having different refractive indices stacked alternately.

[0013] In an implementation, the selective reflection layer may have a thickness of about 350 μm to about 450 μm.

[0014] In an embodiment, a portion of light incident on the optical lens from the optical layer may be reflected by the optical lens, and the optical lens may change a phase of the reflected light to have an opposite phase to the light incident on the optical lens from the optical layer.

[0015] In an embodiment, each of the first phase retardation layer and the second phase retardation layer may include a λ / 4 phase retarder.

[0016] In an implementation, the display panel may further include a color filter layer disposed on the light emitting layer.

[0017] In an embodiment of the present disclosure, a display device includes: a display panel including a light-emitting layer; an optical layer disposed on the display panel; and an optical lens disposed on the optical layer and including a reflector that reflects a portion of light provided from the optical layer, wherein the optical layer includes: a first phase delay layer disposed on the display panel; a selective reflection layer disposed on the first phase delay layer and configured to output linearly polarized light by transmitting light that coincides with a polarization axis and to reflect light that does not coincide with the polarization axis; and a polarization layer disposed on the selective reflection layer and configured to absorb light reflected by the reflector.

[0018] In an embodiment, the optical layer may further include a second phase delay layer in which linear polarized light incident from the selective reflection layer can be converted into circular polarized light, wherein the second phase delay layer may be disposed on the selective reflection layer and may be configured to convert linear polarized light incident from the selective reflection layer into circular polarized light.

[0019] In an embodiment, the optical lens may further include an optical lens phase delay layer in which circularly polarized light provided from the reflecting mirror may be converted into linearly polarized light, wherein the optical lens phase delay layer is disposed on the reflecting mirror.

[0020] In an embodiment, the optical lens phase retardation layer may have a λ / 4 phase retarder, and the optical lens further includes a wire grid polarization layer disposed on the optical lens phase retardation layer.

[0021] In an embodiment, the polarization layer may include a linear polarizer that linearly polarizes incident light and absorbs light reflected by a reflector, and the reflector includes a focusing lens that controls a focal length.

[0022] In an embodiment of the present disclosure, a display device includes: a display panel including a light-emitting layer; an optical layer disposed on the display panel; and an optical lens disposed on the optical layer and including an optical lens phase delay layer in which circularly polarized light provided from the optical layer is converted into linearly polarized light and output by the display device, wherein the optical layer includes: a selective reflection layer disposed on the display panel and configured to output linearly polarized light by transmitting light coinciding with a polarization axis and reflect light that does not coincide with the polarization axis; and a second phase delay layer disposed on the selective reflection layer, in which the linearly polarized light incident from the selective reflection layer is converted into circularly polarized light.

[0023] In an embodiment, the optical layer may include a polarizing layer disposed between the selective reflection layer and the second phase retardation layer, wherein the polarizing layer may include a linear polarizer that linearly polarizes incident light and absorbs light reflected by the reflector.

[0024] In an embodiment, the selective reflection layer may include a reflection film layer in which a plurality of layers respectively having different refractive indices are alternately stacked. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated into and constitute a part of this specification. The accompanying drawings illustrate embodiments of the present disclosure and together with the description serve to explain the principles of the present disclosure. In the drawings:

[0026] Figure 1 is a plan view showing a display device according to an embodiment of the present disclosure;

[0027] Figure 2 is a cross-sectional view showing a display device according to an embodiment of the present disclosure;

[0028] Figure 3 is a cross-sectional view showing a display panel according to an embodiment of the present disclosure;

[0029] Figure 4A is a cross-sectional view of an optical layer according to an embodiment of the present disclosure;

[0030] Figure 4B is a cross-sectional view of a selective reflection layer according to an embodiment of the present disclosure;

[0031] Figure 5 is a cross-sectional view showing a display device according to an embodiment of the present disclosure;

[0032] Figure 6 is a cross-sectional view showing a display device according to an embodiment of the present disclosure;

[0033] Figure 7 is a cross-sectional view showing a portion of a display device according to an embodiment of the present disclosure; and

[0034] Figure 8 is a cross-sectional view of a reflector according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0035] The present disclosure can be implemented in various modifications and has various forms, and specific embodiments are shown in the drawings and described in detail herein. However, it should be understood that the present disclosure is not intended to be limited to the specific forms disclosed, but on the contrary, it is intended to cover all modifications, equivalents and substitutions falling within the spirit and scope of the present disclosure.

[0036] In this specification, it will be understood that when an element (or region, layer, part, etc.) is referred to as being "on", "connected to" or "coupled to" another element, it can be directly set / directly connected / directly coupled to the other element, or intervening elements can be set between them.

[0037] The same reference numerals or symbols always represent the same elements. In the drawings, in order to effectively describe the technical contents, the thickness, ratio and size of the elements may be exaggerated.

[0038] The term "and / or" includes all combinations of one or more of the associated listed elements.

[0039] Although the terms first, second, etc. can be used to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the present disclosure, the first element can be referred to as the second element, and similarly, the second element can also be referred to as the first element. Unless the context clearly indicates otherwise, the singular includes the plural.

[0040] In addition, terms such as "below", "lower", "above", "upper", etc. may be used in the specification to describe the relationship between one element and another element shown in the drawings. It will be understood that these terms have relative concepts and can be described based on the orientation depicted in the drawings.

[0041] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. In addition, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0042] It will be understood that when used in this specification, the terms “include” or “comprises” specify the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

[0043] Hereinafter, embodiments of the present disclosure are described with reference to the accompanying drawings.

[0044] Figure 1 is a plan view showing a display device according to an embodiment of the present disclosure. Figure 1 A head mounted display is shown as an example of the present disclosure.

[0045] Reference Figure 1 , the display device DD according to an embodiment of the present disclosure may include a head mounted display (HMD). Figure 1 The display device DD shown in FIG. 4 has the form of goggles worn on the head. The display device DD can generate virtual images that can be displayed and perceived by a user US wearing the goggles.

[0046] The display device DD may include a front module FP and a head frame HF. The front module FP may provide a virtual image, and the head frame HF may fix the front module FP to the head of the user US. The front module FP may include a front camera FCM and a plurality of sensors SSa, SSb, SSc, and SSd. The head frame HF may include a top frame TF and side frames SF1 and SF2. The top frame TF may extend on the top of the head of the user US. The side frames SF1 and SF2 may extend on the sides of the head of the user US. The top frame TF and the side frames SF1 and SF2 may be connected to each other. Although not shown, as referred to herein Figure 2 As discussed in subsequent figures, the display device DD may include an optical lens system. For example, the display device DD may also include one or more display panels and optical lenses that may correspond to the front module FP and may be oriented toward the eyes (not shown) of the user US.

[0047] The plurality of sensors SSa, SSb, SSc, and SSd may each be a light sensor. The plurality of sensors SSa, SSb, SSc, and SSd may each detect light from an external device ( Figure 1 ) and uses the optical information to provide information for determining the position and orientation of the display device DD. Figure 1 A display device DD having four sensors SSa, SSb, SSc, and SSd is shown, but embodiments of the present disclosure are not limited thereto. The front camera FCM may image the external environment and provide information about the external environment to the user US. The front camera FCM and the plurality of sensors SSa, SSb, SSc, and SSd may be arranged to face the external environment in a front direction. The front direction may be the same direction as the field of view of the user US.

[0048] According to an embodiment of the present disclosure, the top frame TF and the side frames SF1 and SF2 may be connected and coupled to each other. The top frame TF and the side frames SF1 and SF2 may each be coupled to the front module FP, and the front module FP may be fixed to the head of the user US. In an embodiment of the present disclosure, the display device DD may have a band-like structure, but is not limited thereto. The display device DD may have a glasses-like or helmet-like structure. The head frame HF may include Figure 1 Different or other support structures not shown in the figure (e.g., nose pads, chin straps, etc.).

[0049] The display device DD may further include an inertial measurement unit IMU. The inertial measurement unit IMU may measure data about one or more of a force applied to the display device DD, a position of the display device DD, or a magnetic field surrounding the display device DD. The inertial measurement unit IMU may provide information related to the measured data.

[0050] Figure 2 is a cross-sectional view showing a display device according to an embodiment of the present disclosure. Figure 2 is a view showing the path of light generated by the display device DD. Specifically, Figure 2 is provided to the user US via the display device DD (see Figure 1 )'s view of the light path of the eye UE.

[0051] Reference Figure 2 , the display device DD may include a display panel DP, an optical layer OPL, and an optical lens OCL. The display panel DP may generate light Lg. The optical layer OPL may be disposed on the display panel DP. The optical lens OCL may be disposed adjacent to the eye UE of the user US.

[0052] The display panel DP may emit light Lg. Specifically, as Figure 3As shown in , light Lg may be emitted from a light emitting element ED included in a display panel DP. The light Lg may be provided to an optical layer OPL disposed on the display panel DP. A first portion of the light Lg provided to the optical layer OPL may pass through the optical layer OPL, and a second portion of the light Lg may be reflected by the optical layer OPL. The second portion of the light Lg may be reflected by the optical layer OPL to the display panel DP. The first portion of the light Lg passing through the optical layer OPL may be defined as a first light Lg1, and the second portion of the light Lg reflected by the optical layer OPL may be defined as a reflected light RLg. The first light Lg1 may be light circularly polarized by the optical layer OPL. The circularly polarized first light Lg1 may be converted into a second light Lg2 while passing through an optical lens OCL disposed on the optical layer OPL. The second light Lg2 may be light linearly polarized by the optical lens OCL. The second light Lg2 output from the optical lens OCL may be provided to the eye UE of the user US. A detailed description thereof is provided herein.

[0053] The reflected light RLg may be light circularly polarized by the optical layer OPL. The reflected light RLg may be one of left circularly polarized light and right circularly polarized light. A portion of the reflected light RLg may be reflected by the display panel DP (eg, by a light included in the display panel DP). Figure 3 The third light Lg3 is a light beam which is reflected by the first electrode EL1 shown in the figure or the signal wiring in the circuit layer DP-CL). The light reflected by the display panel DP may be defined as third light Lg3. While being reflected by the display panel DP, the third light Lg3 may have a phase opposite to that of the reflected light RLg. For example, when the reflected light RLg is in a right circularly polarized state, the third light Lg3 may be in a left circularly polarized state, or when the reflected light RLg is in a left circularly polarized state, the third light Lg3 may be in a right circularly polarized state. The third light Lg3 may pass through the optical layer OPL and may be provided to the optical lens OCL. The circularly polarized third light Lg3 may be converted into a linearly polarized fourth light Lg4 by the optical lens OCL, and the fourth light Lg4 may be displayed by the display device DD and may be provided to the eye UE of the user US. A detailed description thereof is provided herein.

[0054] Figure 3 is a cross-sectional view showing a display panel according to an embodiment of the present disclosure.

[0055] In the display device DD according to an embodiment of the present disclosure, the display panel DP may be a light-emitting display panel. For example, the display panel DP may be an organic electroluminescent display panel or a quantum dot light-emitting display panel. However, the embodiments of the present disclosure are not limited thereto.

[0056] Reference Figure 3The display panel DP may include a base layer BS, a circuit layer DP-CL disposed on the base layer BS, a display layer DP-ED disposed on the circuit layer DP-CL, and an encapsulation layer TFE disposed on the display layer DP-ED. In addition, the display panel DP may further include a color filter layer CFL disposed on the encapsulation layer TFE and a planarization layer OC disposed on the color filter layer CFL.

[0057] The base layer BS may be a member that provides a base surface on which the circuit layer DP-CL is disposed. The base layer BS may be a rigid substrate or a flexible substrate that can be bent, folded, curled, etc. According to an embodiment of the present disclosure, the base layer BS may be a glass substrate, a metal substrate, a polymer substrate, etc. Optionally, according to an embodiment, the base layer BS may be a silicon wafer. However, the embodiments of the present disclosure are not limited thereto, and the base layer BS may be an inorganic layer, an organic layer, or a composite material layer. According to an embodiment, the base layer BS may be a single-layer structure or a multi-layer structure.

[0058] The circuit layer DP-CL may be disposed on the base layer BS. The circuit layer DP-CL may include an insulating layer, a semiconductor pattern, a conductive pattern, a signal line, etc. The insulating layer, the semiconductor layer, and the conductive layer may be formed on the base layer BS by coating, deposition, etc. The insulating layer, the semiconductor layer, and the conductive layer may be selectively patterned by performing a photolithography process multiple times. Thereafter, the semiconductor pattern, the conductive pattern, and the signal line included in the circuit layer DP-CL may be formed.

[0059] In the case of an embodiment in which the base layer BS is a silicon wafer, the circuit layer DP-CL may be formed by performing a complementary metal oxide semiconductor (CMOS) process on the silicon wafer. In this case, the circuit layer DP-CL may include a fine semiconductor pattern, a conductive pattern, etc. The display panel DP formed of a silicon wafer and having the circuit layer DP-CL formed by performing a CMOS process may have a high resolution.

[0060] The display layer DP-ED may be disposed on the circuit layer DP-CL. The display layer DP-ED may include a light emitting element ED and a capping layer CPL.

[0061] The light emitting element ED may include a first electrode EL1, a light emitting layer EPL disposed on the first electrode EL1, and a second electrode EL2 disposed on the light emitting layer EPL. Although not shown, the light emitting element ED may further include a hole transport region disposed between the first electrode EL1 and the light emitting layer EPL, and an electron transport region disposed between the light emitting layer EPL and the second electrode EL2.

[0062] The first electrode EL1 may be directly disposed on the circuit layer DP-CL. According to an embodiment of the present disclosure, the first electrode EL1 may be an anode. The first electrode EL1 may have a stacked structure including a metal material. For example, the first electrode EL1 may have a stacked structure of a reflective layer and a semi-transparent layer. The reflective layer may include magnesium (Mg), aluminum (Al), platinum (Pt), palladium (Pd), gold (Au), nickel (Ni), neodymium (Nd), iridium (Ir), chromium (Cr), compounds thereof, and the like. The semi-transparent layer may include a material selected from the group consisting of indium tin oxide (ITO), indium zinc oxide (IZO), indium gallium zinc oxide (IGZO), zinc oxide (ZnO), indium oxide (In 2 O 3 ) or at least one selected from the group consisting of aluminum-doped zinc oxide (AZO).

[0063] The light emitting layer EPL may be disposed on the first electrode EL1. According to an embodiment of the present disclosure, the light emitting layer EPL may be disposed on the first electrode EL1 as a common layer. The light emitting layer EPL may overlap with both the pixel area and the non-pixel area. That is, the light emitting element ED may be a light emitting element having a series structure. In the series structure, a plurality of layers may be stacked in series. The layers may emit light having different wavelength ranges. According to an embodiment, the light emitting layer EPL may emit white light. The plurality of layers of the light emitting layer EPL may be stacked in various ways. Different arrangements of the layers may be arranged in a patterned manner, and a light emitting layer EPL including separate patterns may be provided. In this case, the patterns of the light emitting layer EPL may respectively emit light having different colors from each other.

[0064] The second electrode EL2 may be disposed on the light emitting layer EPL. The second electrode EL2 may be a cathode. According to an embodiment of the present disclosure, the second electrode EL2 may be disposed as a common layer in the light emitting element ED. That is, the second electrode EL2 may be disposed as a common electrode on the light emitting layer EPL. The second electrode EL2 may be transparent. The second electrode EL2 may overlap both the pixel region and the non-pixel region.

[0065] The capping layer CPL may be disposed on the second electrode EL2. The capping layer CPL may cover the light emitting element ED. The capping layer CPL may protect the light emitting element ED from moisture or foreign matter introduced from the outside. The capping layer CPL may include an organic material.

[0066] The encapsulation layer TFE may be disposed on the display layer DP-ED. The encapsulation layer TFE may include at least one inorganic film (hereinafter, referred to as an inorganic encapsulation film). In addition, the encapsulation layer TFE may include at least one organic film (hereinafter, referred to as an organic encapsulation film) and at least one inorganic encapsulation film.

[0067] The inorganic encapsulation film of the encapsulation layer TFE can protect the display layer DP-ED from moisture / oxygen, and the organic encapsulation film of the encapsulation layer TFE can protect the display layer DP-ED from foreign matter such as dust particles. The inorganic encapsulation film may include silicon nitride, silicon oxynitride, silicon oxide, titanium oxide, aluminum oxide, etc., but is not particularly limited thereto. The organic encapsulation film may include an acrylic compound, an epoxy-based compound, etc. The organic encapsulation film may include a photopolymerizable organic material, and is not particularly limited thereto.

[0068] The color filter layer CFL may be disposed on the encapsulation layer TFE. The color filter layer CFL may include a plurality of color filters. The color filter layer CFL may include a first color filter CF1, a second color filter CF2, and a third color filter CF3. Although not shown, the color filter layer CFL may further include a light blocking layer (not shown). The light blocking layer may be disposed between the first color filter CF1, the second color filter CF2, and the third color filter CF3. The light blocking layer may be a black matrix. The light blocking layer may be formed to include an organic light blocking material or an inorganic light blocking material including a black pigment or a black dye. The light blocking layer may reduce or prevent light leakage and is defined at the boundary between the first color filter CF1, the second color filter CF2, and the third color filter CF3 adjacent to each other. Meanwhile, in the present specification, the wording "region / portion corresponds to region / portion" means "overlapping each other" and is not limited to having the same area.

[0069] The first color filter CF1, the second color filter CF2, and the third color filter CF3 may each include a polymer photosensitive resin and a colorant. The colorant may include a pigment and a dye. The red colorant may include a red pigment and a red dye, the green colorant may include a green pigment and a green dye, and the blue colorant may include a blue pigment and a blue dye. For example, the first color filter CF1 may include a red pigment or a red dye, the second color filter CF2 may include a blue pigment or a blue dye, and the third color filter CF3 may include a green pigment or a green dye. In the light provided from the light emitting layer EPL, the light passing through the first color filter CF1 may be provided to the outside of the display panel DP as red light, the light passing through the second color filter CF2 may be provided to the outside of the display panel DP as blue light, and the light passing through the third color filter CF3 may be provided to the outside of the display panel DP as green light.

[0070] The planarization layer OC may be disposed on the color filter layer CFL. The planarization layer OC may cover the first color filter CF1, the second color filter CF2, and the third color filter CF3. The planarization layer OC may include an organic material. The organic material may be transparent and may include, for example, an acrylic resin. The planarization layer OC may form an upper surface of the display panel DP. The planarization layer OC may provide a flat upper surface. The planarization layer OC may be omitted.

[0071] Figure 4A is a cross-sectional view of an optical layer according to an embodiment of the present disclosure. Figure 4B is a cross-sectional view of a selective reflection layer according to an embodiment of the present disclosure. Figure 4A and Figure 4B Describe the optical layer OPL.

[0072] Reference Figure 4A , the optical layer OPL may include a first phase retardation layer RC1, a selective reflection layer SRL, a polarization layer PL, and a second phase retardation layer RC2. The first phase retardation layer RC1, the selective reflection layer SRL, the polarization layer PL, and the second phase retardation layer RC2 may be sequentially stacked in a third direction DR3 which is a thickness direction of the optical layer OPL. In detail, the selective reflection layer SRL may be disposed on the first phase retardation layer RC1, the polarization layer PL may be disposed on the selective reflection layer SRL, and the second phase retardation layer RC2 may be disposed on the polarization layer PL.

[0073] Although not shown, the first phase retardation layer RC1 may be a component constituting a lower portion of the optical layer OPL. The first phase retardation layer RC1 may be aligned with the display panel DP (see Figure 2 ) are arranged adjacent to each other. That is, the distance between the first phase delay layer RC1 and the display panel DP may be shorter than the distance between the second phase delay layer RC2 and the display panel DP. The first phase delay layer RC1 may be a layer that delays the phase of the light provided thereto. Phase delay describes the change in the polarization state of the light passing through the phase delayer. According to an embodiment of the present disclosure, the first phase delay layer RC1 may include a λ / 4 phase delay. For example, when the light emitted from the display panel DP and provided to the first phase delay layer RC1 has a wavelength of about 550nm, the light passing through the first phase delay layer RC1 may have a phase delay value of about 137.5nm. In addition, the first phase delay layer RC1 may have optical anisotropy and convert the polarization state of the light incident thereon. That is, the light emitted from the display panel DP and provided to the first phase delay layer RC1 may be converted from a linear polarization state to a circular polarization state. In addition, the light emitted from the display panel DP and provided to the first phase delay layer RC1 in a circular polarization state may be converted into a linear polarization state.

[0074] Refer to Figure 4A and Figure 4B, the selective reflection layer SRL may be disposed on the first phase delay layer RC1. The selective reflection layer SRL may include a plurality of layers stacked in sequence. The selective reflection layer SRL may include a first protective coating layer PC1, a reflective film layer RFL, and a second protective coating layer PC2. In addition, the selective reflection layer SRL may further include a first adhesive layer AD1 disposed between the first protective coating layer PC1 and the reflective film layer RFL, and a second adhesive layer AD2 disposed between the reflective film layer RFL and the second protective coating layer PC2. The first adhesive layer AD1 may bond the first protective coating layer PC1 and the reflective film layer RFL together, and the second adhesive layer AD2 may bond the reflective film layer RFL and the second protective coating layer PC2 together. The first adhesive layer AD1 and the second adhesive layer AD2 may each have a thickness of about 0.1 micrometers (μm) to about 2 μm. Optionally, the first adhesive layer AD1 and the second adhesive layer AD2 may be omitted in the selective reflection layer SRL.

[0075] The first protective coating layer PC1 and the second protective coating layer PC2 may protect the reflective film layer RFL. For example, the first protective coating layer PC1 and the second protective coating layer PC2 may reduce or prevent moisture or foreign matter from being introduced into the reflective film layer RFL from the outside. The first protective coating layer PC1 and the second protective coating layer PC2 may have the same thickness. For example, the first protective coating layer PC1 and the second protective coating layer PC2 may each have a thickness of about 120 μm to about 150 μm. However, embodiments of the present disclosure are not limited thereto. The first protective coating layer PC1 and the second protective coating layer PC2 may have different thicknesses from each other.

[0076] According to an embodiment of the present disclosure, the reflective film layer RFL may include a plurality of layers having different refractive indices, and the layers having different refractive indices may be alternately stacked. Specifically, the reflective film layer RFL may have a structure in which a high refractive index layer and a low refractive index layer having a refractive index different from that of the high refractive index layer are alternately stacked. The reflective film layer RFL may be formed of a plurality of polymer layers by an ultra-thin film stacking molding technique. The thickness of the reflective film layer RFL may be less than the thickness of each of the first protective coating layer PC1 and the second protective coating layer PC2. The reflective film layer RFL may have a thickness of about 100 μm to about 120 μm.

[0077] According to an embodiment of the present disclosure, the selective reflection layer SRL may include a dual brightness enhancement film (DBEF). However, the embodiment of the present disclosure is not limited thereto, and the selective reflection layer SRL may include a wire grid polarizer (WGP). In the light incident on the selective reflection layer SRL, the selective reflection layer SRL may transmit light that coincides with the polarization axis, and may reflect light that does not coincide with the polarization axis. For example, the selective reflection layer SRL may be manufactured so that in the light incident on the selective reflection layer SRL, the light may be transmitted on the X-axis with the same refractive index, and the light may be reflected on the Y-axis with a different refractive index. The light transmitted through the selective reflection layer SRL and the light reflected from the selective reflection layer SRL may be linearly polarized light. The linear polarization direction of the light transmitted through the selective reflection layer SRL and the linear polarization direction of the light reflected from the selective reflection layer SRL may be perpendicular to each other. According to an embodiment of the present disclosure, the selective reflection layer SRL may have a thickness of about 350 μm to about 450 μm.

[0078] Reference Figure 4A , the polarization layer PL may be disposed on the selective reflection layer SRL. According to an embodiment of the present disclosure, the polarization layer PL may include a linear polarizer as a layer that linearly polarizes light provided to the polarization layer PL in one direction. The polarization layer PL may be a film-type linear polarizer including a stretched polymer film. For example, the stretched polymer film may be a stretched polyvinyl alcohol-based film.

[0079] The polarizing layer PL may be formed by adsorbing a dichroic dye onto a stretched polymer film. For example, the polarizing layer PL may be formed by adsorbing iodine onto a stretched polyvinyl alcohol film. In this case, the direction in which the polymer film is stretched may be the absorption axis of the polarizing layer PL, and the direction perpendicular to the stretching direction may be the transmission axis of the polarizing layer PL. The polarizing layer PL may be formed on the selective reflection layer SRL by coating. That is, the polarizing layer PL may be a liquid crystal coating. According to an embodiment of the present disclosure, the angle at which the optical axis of the first phase retardation layer RC1 and the polarization axis of the polarizing layer PL intersect each other may be about 45°.

[0080] Although not shown in the drawings, the polarizing layer PL may further include at least one protective layer. For example, the polarizing layer PL may further include a triacetyl cellulose (TAC) layer disposed on at least one of its upper and lower surfaces. In addition, the embodiments of the present disclosure are not limited thereto, and the polarizing layer PL may further include a hard coating layer, an anti-reflection layer, an anti-glare layer, etc. as a protective layer.

[0081] The second phase delay layer RC2 may be disposed on the polarization layer PL. The second phase delay layer RC2 may be a layer that delays the phase of the light provided thereto. According to an embodiment of the present disclosure, the second phase delay layer RC2 may include a λ / 4 phase retarder. However, the embodiments of the present disclosure are not limited thereto, and the second phase delay layer RC2 may be a layer that delays the phase of the provided light by λ / 2. For example, when the light passing through the polarization layer PL and provided to the second phase delay layer RC2 has a wavelength of about 550 nm, the light passing through the second phase delay layer RC2 may have a phase delay value of about 275 nm.

[0082] In addition, the second phase retardation layer RC2 may have optical anisotropy and may convert the polarization state of light incident thereon. That is, the light emitted from the polarization layer PL and provided to the second phase retardation layer RC2 may be converted from a linear polarization state to a circular polarization state. In addition, the light emitted from the polarization layer PL and provided to the second phase retardation layer RC2 may be converted from a circular polarization state to a linear polarization state.

[0083] The phase retardation value of the first phase retardation layer RC1 in the thickness direction may be different from the phase retardation value of the second phase retardation layer RC2 in the thickness direction. As an example, according to the present disclosure, one of the phase retardation value of the first phase retardation layer RC1 in the thickness direction and the phase retardation value of the second phase retardation layer RC2 in the thickness direction may have a positive value, and the other may have a negative value. For example, the first phase retardation layer RC1 may be a positive A plate, and the second phase retardation layer RC2 may be a negative A plate.

[0084] According to an embodiment of the present disclosure, the first phase retardation layer RC1 and the second phase retardation layer RC2 may each be a liquid crystal coating. The first phase retardation layer RC1 and the second phase retardation layer RC2 may each be a liquid crystal coating formed using a reactive liquid crystal monomer. The first phase retardation layer RC1 and the second phase retardation layer RC2 may each be composed of a liquid crystal coating, and may not include a base substrate used as a support. The first phase retardation layer RC1 and the second phase retardation layer RC2 may each be composed of a liquid crystal coating, and the display device DD (see Figure 2 )'s overall thickness can be reduced.

[0085] Figure 5 is a cross-sectional view showing a display device according to an embodiment of the present disclosure. Figure 5In the drawings of the display device DD, the phase (or phases) of different light can be graphically represented as unpolarized light, linearly polarized light, or circularly polarized light. In addition, the direction of polarized light can be indicated. The polarization and direction shown are exemplary and not restrictive. In addition, it should be understood that although the layers of the display device DD can be depicted as separated from each other in the drawings, the layers can be arranged to contact each other in a stacked manner. For example, the drawings can be used to illustrate a specific transformation of light in a specific layer.

[0086] Reference Figure 5 , light Lg may be emitted from the display panel DP. The light Lg may include image information for forming an image. The light Lg emitted from the display panel DP may be in a state where various phases coexist. The light Lg may be provided to the first phase retardation layer RC1. The light Lga passing through the first phase retardation layer RC1 may be provided to the selective reflection layer SRL. Among the light Lga provided to the selective reflection layer SRL, the light Lgb having a component consistent with a component of the polarization axis of the selective reflection layer SRL may pass through the selective reflection layer SRL, and other light may be reflected from the selective reflection layer SRL and may be provided to the first phase retardation layer RC1 as reflected light RLga. The light Lgb passing through the selective reflection layer SRL and the reflected light RLga reflected from the selective reflection layer SRL may each be linearly polarized light. The linear polarization direction of the light Lgb passing through the selective reflection layer SRL may be perpendicular to the linear polarization direction of the reflected light RLga reflected from the selective reflection layer SRL.

[0087] The light Lgb passing through the selective reflection layer SRL may be provided to the polarization layer PL. The polarization layer PL may allow light coinciding with its polarization axis to pass therethrough and absorb light that does not coincide with the polarization axis. The light Lgb passing through the selective reflection layer SRL may coincide with the polarization axis of the polarization layer PL, thereby passing through the polarization layer PL without light loss from the polarization layer PL. The light Lgb passing through the polarization layer PL may be provided to the second phase retardation layer RC2. The first light Lg1 passing through the second phase retardation layer RC2 may be right circularly polarized light. That is, the second phase retardation layer RC2 may allow the linearly polarized light Lgb to be right circularly polarized, and the right circularly polarized first light Lg1 may be emitted from the second phase retardation layer RC2. The first light Lg1 emitted from the second phase retardation layer RC2 may be provided to the optical lens OCL. The circularly polarized first light Lg1 may be converted into a linearly polarized second light Lg2 after passing through the optical lens OCL. That is, the optical lens OCL may emit the linearly polarized second light Lg2.

[0088] The reflected light RLga reflected from the selective reflection layer SRL may pass through the first phase delay layer RC1. The reflected light RLg passing through the first phase delay layer RC1 in a direction opposite to the third direction DR3 may be left circularly polarized light. The reflected light RLg passing through the first phase delay layer RC1 may be provided to the display panel DP. Part of the reflected light RLg provided to the display panel DP may be reflected from the display panel DP. Specifically, the reflected light RLg provided to the display panel DP may be provided from the first phase delay layer RC1 in the direction opposite to the third direction DR3. Figure 3 The first electrode EL1 shown in FIG. 1 or the first electrode EL2 from the display panel DP Figure 3 The left circularly polarized reflected light RLg may be converted into right circularly polarized light while being reflected from the first electrode EL1 or the signal wiring in the circuit layer DP-CL. That is, the right circularly polarized third light Lg3 may be provided to the first phase delay layer RC1. The right circularly polarized third light Lg3 may be considered to be re-provided to the first phase delay layer RC1 after the light Lg emitted from the display panel DP. The first phase delay layer RC1 may allow the right circularly polarized third light Lg3 to be converted into a linearly polarized third light Lg3a and emitted therefrom.

[0089] The third light Lg3a passing through the selective reflection layer SRL may be provided to the polarization layer PL. The third light Lg3a passing through the selective reflection layer SRL may coincide with the polarization axis of the polarization layer PL, and thus may pass through the polarization layer PL without light loss from the polarization layer PL. The third light Lg3b passing through the polarization layer PL may be provided to the second phase delay layer RC2. The third light Lg3c passing through the second phase delay layer RC2 may be right circularly polarized light. That is, the second phase delay layer RC2 may emit right circularly polarized third light Lg3c. The third light Lg3c emitted from the second phase delay layer RC2 may be provided to the optical lens OCL. The third light Lg3c may be converted from circularly polarized light to linearly polarized light while passing through the optical lens OCL. That is, the optical lens OCL may emit linearly polarized fourth light Lg4.

[0090] Since the display device DD according to an embodiment of the present disclosure includes the selective reflection layer SRL, the reflected light RLga reflected from the selective reflection layer SRL can be reflected from the display panel DP and pass through the optical layer OPL and the optical lens OCL to be emitted as the fourth light Lg4. Therefore, the loss of the light Lg emitted from the display panel DP while passing through the optical layer OPL and the optical lens OCL can be minimized. That is, the light emission efficiency of the display device DD can be improved.

[0091] Figure 6 is a cross-sectional view showing a display device according to an embodiment of the present disclosure. Figure 7is a cross-sectional view showing a display device according to an embodiment of the present disclosure. Specifically, Figure 7 is a cross-sectional view showing an optical layer OPL and an optical lens OCL. Hereinafter, repeated description of elements, features, or steps described elsewhere herein may be omitted.

[0092] Reference Figure 6 , light Lg may be emitted from the display panel DP. The light Lg emitted from the display panel DP may pass through the optical layer OPL. The first light Lg1 that passes through the optical layer OPL and is right circularly polarized may be provided to the optical lens OCL. A portion of the first light Lg1 provided to the optical lens OCL may be reflected by the optical lens OCL. The optical lens OCL may change the phase of the first reflected light RLg1 to have a phase opposite to that of the first light Lg1 incident on the optical lens OCL from the optical layer OPL. Reference Figure 7 , a portion of the first light Lg1 may be reflected from the reflector RM included in the optical lens OCL. The first reflected light RLg1 reflected from the optical lens OCL may be left circularly polarized light. That is, the first light Lg1 and the first reflected light RLg1 may have opposite phases to each other.

[0093] The first reflected light RLg1 may be provided to the second phase retardation layer RC2 in a direction opposite to the third direction DR3. The first reflected light RLg1 may be light that is linearly polarized while passing through the second phase retardation layer RC2. The linearly polarized first reflected light RLg1a may be provided to the polarization layer PL. The linearly polarized first reflected light RLg1a may be perpendicular to the polarization axis of the polarization layer PL. The polarization layer PL may allow light that coincides with its polarization axis to pass therethrough and absorb light that does not coincide with the polarization axis. That is, since the first reflected light RLg1a does not coincide with the polarization axis of the polarization layer PL, the first reflected light RLg1a may be absorbed by the polarization layer PL. In the example, the first reflected light RLg1a may be completely absorbed by the polarization layer PL.

[0094] In an embodiment in which the polarization layer PL is not provided, the first reflected light RLg1a may be reflected from the selective reflection layer SRL, and light having a phase opposite to that of the first light Lg1 may be provided to the optical lens OCL. Since the light having a phase opposite to that of the first light Lg1 is provided to the optical lens OCL, a ghost image may be generated and directed toward the user US (see Figure 1 )'s eyesUE (see Figure 2) projection. Specifically, since light having a phase opposite to that of the first light Lg1 may be provided to the optical lens OCL in addition to the first light Lg1 and reaches the eye UE of the user US at a certain time interval, a ghost image phenomenon in which images appear to be superimposed may occur. The display device DD according to an embodiment of the present disclosure may include a polarizing layer PL disposed on the selective reflection layer SRL, and the polarizing layer PL may absorb the first reflected light RLg1a. The absorption of the first reflected light RLg1a may reduce or prevent the occurrence of a ghost image phenomenon. That is, the display device DD may reliably generate an image, thereby reducing or preventing the occurrence of a ghost image phenomenon.

[0095] Reference Figure 7 , the optical lens OCL may include a reflector RM, an optical lens phase delay layer RC, and a wire grid polarization layer WGP. The reflector RM may be disposed adjacent to the optical layer OPL. The optical lens phase delay layer RC may be disposed on the reflector RM. The wire grid polarization layer WGP may be disposed on the optical lens phase delay layer RC. Although not shown, the optical lens OCL may further include a light source that enables light to be focused on the user US (see Figure 1 ) on the eye UE, such as a refractive or diffractive lens, a partially reflective coating, a wavelength plate, a reflective polarizer, a linear polarizer, an anti-reflective coating, an additional spatially variable polarizer or other optical structure. The optical lens OCL may also include an auxiliary lens SL disposed on the wire grid polarization layer WGP.

[0096] The first light Lg1 emitted from the optical layer OPL may be provided to the reflector RM. A first portion of the first light Lg1 provided to the reflector RM may pass through the reflector RM, and a second portion of the first light Lg1 provided to the reflector RM may be reflected from the reflector RM. An amount of the first light Lg1a passing through the reflector RM may be the same as an amount of the first reflected light RLg1 reflected from the reflector RM. That is, about 50% of the first light Lg1 may pass through the reflector RM.

[0097] The first light Lg1a passing through the reflector RM can be provided to the optical lens phase delay layer RC. The optical lens phase delay layer RC can delay the phase of the light provided to the optical lens phase delay layer RC. According to an embodiment of the present disclosure, the optical lens phase delay layer RC can be a λ / 4 phase retarder. In addition, the optical lens phase delay layer RC can have optical anisotropy and can convert the polarization state of the light incident thereon. That is, the light emitted from the reflector RM and provided to the optical lens phase delay layer RC can be converted from a circular polarization state to a linear polarization state. Optionally, the light emitted from the reflector RM and provided to the optical lens phase delay layer RC can be converted from a linear polarization state to a circular polarization state.

[0098] The first light Lg1a may be converted from a right circular polarization state to a linear polarization state while passing through the optical lens phase delay layer RC. The first light Lg1b emitted from the optical lens phase delay layer RC may be provided to the wire grid polarization layer WGP. The wire grid polarization layer WGP may have a reflection axis and a transmission (or transmission) axis orthogonal to the reflection axis. Light polarized to be parallel to the reflection axis of the wire grid polarization layer WGP may be reflected from the wire grid polarization layer WGP, and light polarized to be parallel to the transmission axis may pass through the wire grid polarization layer WGP. According to the present disclosure, the first light Lg1b may be linearly polarized light so as to be parallel to the reflection axis of the wire grid polarization layer WGP. That is, the first light Lg1b provided to the wire grid polarization layer WGP may be reflected and provided to the optical lens phase delay layer RC as the second reflected light RLg2. In an example, the first light Lg1b provided to the wire grid polarization layer WGP may be completely reflected and provided to the optical lens phase delay layer RC as the second reflected light RLg2.

[0099] The second reflected light RLg2a passing through the optical lens phase delay layer RC may be converted from a linear polarization state to a right circular polarization state. The right circularly polarized second reflected light RLg2a may be provided to the reflector RM. A portion of the right circularly polarized second reflected light RLg2a may be reflected from the reflector RM. While being reflected from the reflector RM, the fifth light Lg5 may be converted from a right circular polarization state to a left circular polarization state. That is, while the fifth light Lg5 is reflected from the reflector RM, the phase of the fifth light Lg5 may be reversed. The fifth light Lg5 reflected from the reflector RM may have about 50% of the light of the second reflected light RLg2a.

[0100] The fifth light Lg5 may be provided to the optical lens phase delay layer RC. The fifth light Lg5 may be light converted from left circularly polarized light to linearly polarized light while passing through the optical lens phase delay layer RC. The linearly polarized fifth light Lg5a may be provided to the wire grid polarization layer WGP. The linear polarization direction of the fifth light Lg5a may be perpendicular to the linear polarization direction of the first light Lg1b. According to the present disclosure, the fifth light Lg5a may be linearly polarized light parallel to the transmission axis of the wire grid polarization layer WGP. That is, the fifth light Lg5a provided to the wire grid polarization layer WGP may pass through the wire grid polarization layer WGP. In an example, the fifth light Lg5a provided to the wire grid polarization layer WGP may completely pass through the wire grid polarization layer WGP.

[0101] The fifth light Lg5b passing through the wire grid polarization layer WGP may be provided to the auxiliary lens SL disposed on the wire grid polarization layer WGP. The auxiliary lens SL may include a convex lens so that the light provided to the auxiliary lens SL may be focused on a point that coincides with the eye UE of the user US. The second light Lg2 passing through the auxiliary lens SL may be output by the display device DD and provided to the eye UE of the user US. That is, due to the second light Lg2, an image corresponding to the second light Lg2 may be output by the display device DD and provided to the eye UE of the user US.

[0102] Figure 8 is a cross-sectional view of a reflector according to an embodiment of the present disclosure.

[0103] Reference Figure 8 The reflecting mirror RM may include a reflecting lens RL and a focusing lens FL disposed on the reflecting lens RL.

[0104] The reflective lens RL can allow the reflector RM to be provided with Figure 7 The reflective lens RL may include a lens. For example, the reflective lens RL may include a macro lens, a soft lens, a fisheye lens, a tilt-shift (TS) lens, etc., depending on the distortion adjustment, resolution capability, and / or minimum focal length of the photo. The reflective lens RL may be formed of a single component or a plurality of components.

[0105] The reflector RM may further include a focusing lens FL disposed on the reflective lens RL. The focusing lens FL may control the focal length of the display device DD. The focusing lens FL may be a lens that allows the focal length to be continuously changed, and thus the focal length may be changed according to the movement of the focusing lens FL. Therefore, the first light Lg1 provided to the reflector RM may be refracted or diffracted (partially focused) by the focusing lens FL.

[0106] Since the display device according to the embodiment of the present disclosure may include a selective reflection layer, the light emitted from the display panel may be partially reflected from the selective reflection layer in a direction opposite to the third direction DR3, and the reflected light may be reflected from the display panel, thereby providing the reflected light to the user. Therefore, the light loss caused when the light emitted from the display panel passes through the optical layer and the optical lens included in the display device may be minimized.

[0107] In addition, since the display device according to the embodiment of the present disclosure includes a polarizing layer disposed on the selective reflection layer, the occurrence of a ghost image phenomenon can be reduced or prevented by causing the polarizing layer to absorb reflected light reflected from the optical lens. That is, a display device with improved reliability in image generation can be provided.

[0108] Although the embodiments of the present disclosure have been described, it should be understood that the present disclosure is not limited and various changes and modifications may be made by one of ordinary skill in the art within the spirit and scope of the present disclosure as claimed in the appended claims.

[0109] Therefore, the technical scope of the present disclosure is not limited to the contents described in the detailed description of the specification, but should be determined by the claims.

Claims

1. A display device, characterized in that: include: A display panel including a light emitting layer; An optical layer, disposed on the display panel; as well as an optical lens disposed on the optical layer and including an optical lens phase retardation layer in which circularly polarized light provided from the optical layer is converted into linearly polarized light, Wherein, the optical layer comprises: A first phase retardation layer is disposed on the display panel; a selective reflection layer disposed on the first phase retardation layer and configured to output linearly polarized light by transmitting light coinciding with a polarization axis and to reflect light not coinciding with the polarization axis; and A second phase retardation layer is disposed on the selective reflection layer, and in the second phase retardation layer, the linearly polarized light incident from the selective reflection layer is converted into the circularly polarized light.

2. The display device according to claim 1, characterized in that The optical lens includes a reflector disposed on the optical layer.

3. The display device according to claim 2, characterized in that: The optical layer includes a polarizing layer disposed between the selective reflection layer and the second phase retardation layer.

4. The display device according to claim 3, characterized in that: The polarizing layer includes a linear polarizer that linearly polarizes incident light, and absorbs light reflected by the reflector.

5. The display device according to claim 3, characterized in that: The angle between the optical axis of the first phase retardation layer and the polarization axis of the polarization layer is 45°.

6. The display device according to claim 2, characterized in that: The reflector includes a focusing lens to control the focal length.

7. The display device according to claim 1, characterized in that: The optical lens includes a wire grid polarization layer disposed on the optical lens phase retardation layer.

8. The display device according to claim 1, characterized in that: The selective reflection layer includes a first protective coating layer, a reflection film layer, and a second protective coating layer stacked in sequence, and the reflection film layer includes a plurality of layers having different refractive indices stacked alternately.

9. The display device according to claim 1, characterized in that: The selective reflection layer has a thickness of 350 micrometers to 450 micrometers.

10. The display device according to claim 1, characterized in that A portion of the light incident on the optical lens from the optical layer is reflected by the optical lens, and the optical lens changes a phase of the reflected light to have a phase opposite to that of the light incident on the optical lens from the optical layer.

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