Display device

Abstract

A display device includes a display panel and an optical panel disposed on the display panel, the display panel including: a light emitting device portion including a light emitting device; a first phase retardation layer disposed on the light emitting device portion and having a reverse wavelength dispersion characteristic; and an absorption polarizer disposed on the first phase retardation layer, and the optical panel includes: a first lens portion disposed on the display panel and including a beam splitter; and a second lens portion disposed on the first lens portion and including a reflective polarizer.

Description

Technical Field

[0001] The present disclosure relates to a display device, and more particularly to a head-mounted display device. Background Art

[0002] With the development of information technology, the importance of display devices as a connection medium between users and information has become increasingly prominent. For example, the use of display devices such as liquid crystal display ("LCD") devices, organic light emitting display ("OLED") devices, plasma display devices ("PDD"), quantum dot display devices, etc. is increasing.

[0003] Display devices are included and used in various electronic devices, and recently, head-mounted display devices that are placed directly in front of a user's eyes and display images to provide the user with a three-dimensional effect or a sense of immersion have also become widely popular. Summary of the invention

[0004] The embodiment provides a display device with improved display quality.

[0005] The display device in the embodiment includes a display panel and an optical panel arranged on the display panel, the display panel includes: a light-emitting device portion, including at least one light-emitting device; a first phase delay layer, arranged on the light-emitting device portion and having a reverse wavelength dispersion characteristic; and an absorption polarizer, arranged on the first phase delay layer, the optical panel includes: a first lens portion, arranged on the display panel, and including a beam splitter; and a second lens portion, arranged on the first lens portion, and including a reflective polarizer.

[0006] In an embodiment, the first phase retardation layer may include at least one of a reverse wavelength dispersion film and a reverse wavelength dispersion liquid crystal.

[0007] In an embodiment, the reverse wavelength dispersion film included in the first phase retardation layer may be a film in which a first polymer having positive birefringence and a second polymer having negative birefringence are mixed.

[0008] In an embodiment, the reverse wavelength dispersion liquid crystal included in the first phase retardation layer may be a liquid crystal in which a normal dispersion mesogen and a reverse dispersion mesogen are mixed.

[0009] In an embodiment, the first phase retardation layer may have a structure in which two or more phase retardation layers having different retardation axes are sequentially stacked.

[0010] In an embodiment, the absorptive polarizer of the display panel may have a light absorption axis, absorb polarized light of the light absorption axis, and transmit polarized light perpendicular to the light absorption axis, and the reflective polarizer of the second lens portion may have a reflection axis, reflect polarized light of the reflection axis, and transmit polarized light perpendicular to the reflection axis.

[0011] In an embodiment, the light absorption axis and the reflection axis may have the same direction as each other.

[0012] In an embodiment, the first phase retardation layer may have a first retardation axis, retard light in a direction of the first retardation axis by λ / 4, and change linearly polarized light into circularly polarized light or change circularly polarized light into linearly polarized light.

[0013] In an embodiment, the display panel may further include: a second phase retardation layer, disposed on the absorbing polarizer, having a second retardation axis, delaying light in the direction of the second retardation axis by λ / 4, and changing linear polarized light into circular polarized light or changing circular polarized light into linear polarized light.

[0014] In an embodiment, the light emitting device may include a pixel electrode, a light emitting layer disposed on the pixel electrode, and a common electrode disposed on the light emitting layer, the common electrode may reflect some of the incident light, and the light reflected from the common electrode may be transmitted through the first phase delay layer and absorbed by the absorption polarizer.

[0015] In an embodiment, no separate polarizer may be disposed between the first phase retardation layer and the absorbing polarizer.

[0016] The display device in the embodiment includes a display panel and an optical panel arranged on the display panel, the display panel including: a light-emitting device portion, including at least one light-emitting device; a first phase delay layer, arranged on the light-emitting device portion and having a reverse wavelength dispersion characteristic; a first absorption polarizer, arranged on the first phase delay layer; and a reflective polarizer, arranged on the first absorption polarizer; and the optical panel including: a first lens portion, arranged on the display panel and including a beam splitter; and a second lens portion, arranged on the first lens portion and including a second absorption polarizer.

[0017] In an embodiment, the first phase retardation layer may include at least one of a reverse wavelength dispersion film and a reverse wavelength dispersion liquid crystal.

[0018] In an embodiment, the reverse wavelength dispersion film included in the first phase retardation layer may be a film in which a first polymer having positive birefringence and a second polymer having negative birefringence are mixed.

[0019] In an embodiment, the reverse wavelength dispersion liquid crystal included in the first phase retardation layer may be a liquid crystal in which a normal dispersion mesogen and a reverse dispersion mesogen are mixed.

[0020] In an embodiment, the first phase retardation layer may have a structure in which two or more phase retardation layers having different retardation axes are sequentially stacked.

[0021] In an embodiment, the first absorption polarizer of the display panel may have a first light absorption axis, absorb polarized light of the first light absorption axis, and transmit polarized light perpendicular to the first light absorption axis, the reflective polarizer of the display panel may have a reflection axis, reflect polarized light of the reflection axis, and transmit polarized light perpendicular to the reflection axis, and the second absorption polarizer of the second lens portion may have a second light absorption axis, absorb polarized light of the second light absorption axis, and transmit polarized light perpendicular to the second light absorption axis.

[0022] In an embodiment, the first light absorption axis, the reflection axis and the second light absorption axis may have the same direction as each other.

[0023] In an embodiment, the first phase retardation layer may have a first retardation axis, retard light in a direction of the first retardation axis by λ / 4, and change linearly polarized light into circularly polarized light or change circularly polarized light into linearly polarized light.

[0024] In an embodiment, the display panel may further include: a second phase delay layer, disposed on the first absorbing polarizer, having a second delay axis, delaying light in the direction of the second delay axis by λ / 4, and changing linear polarized light into circular polarized light or changing circular polarized light into linear polarized light.

[0025] In an embodiment, the light emitting device may include a pixel electrode, a light emitting layer disposed on the pixel electrode, and a common electrode disposed on the light emitting layer, the common electrode may reflect some of the incident light, and the light reflected from the common electrode may be transmitted through the first phase delay layer and absorbed by the first absorption polarizer.

[0026] In an embodiment, the light emitting device portion, the first phase retardation layer, the first absorption polarizer, and the reflective polarizer may be sequentially stacked.

[0027] In an embodiment, no separate polarizer may be disposed between the first phase retardation layer and the first absorbing polarizer.

[0028] The display device in the embodiment may include a display panel and an optical panel disposed in front of the display panel, and light emitted from the display panel may be bent (e.g., refracted) by a lens included in the optical panel and then reach the user. Therefore, the user can observe an image larger than the size of the display panel. Therefore, the degree to which the user is immersed in the image can be improved, and the three-dimensional effect of the image can also be improved.

[0029] In addition, the display panel may have a structure in which a light emitting device portion, a phase delay layer having a reverse wavelength dispersion characteristic, and an absorption polarizer are sequentially stacked. Therefore, the light reflected from the common electrode of the display panel can be absorbed by the absorption polarizer and disappear (lost). Therefore, the light reflected from the common electrode of the display panel can be substantially invisible to the user. Therefore, the appearance of a virtual image due to reflection of the common electrode can be reduced or prevented.

[0030] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Illustrative, non-limiting embodiments will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.

[0032] Figure 1 is a schematic diagram showing an example of a display device.

[0033] Figure 2 It is shown that the Figure 1 Schematic cross-sectional view of a display panel in a display device.

[0034] Figure 3 It is schematically shown from Figure 1 A diagram showing the path of light emitted by a display device.

[0035] Figure 4 It is shown that the Figure 1 A cross-sectional view of a display panel in a display device.

[0036] Figure 5 is a schematic diagram showing another embodiment of a display device.

[0037] Figure 6 It is shown that the Figure 5 Schematic cross-sectional view of a display panel in a display device.

[0038] Figure 7 It is schematically shown from Figure 5 A diagram showing the path of light emitted by a display device.

[0039] Figure 8is a schematic diagram showing another embodiment of a display device.

[0040] Fig. 9 It is shown that the Figure 8 Schematic cross-sectional view of a display panel in a display device.

[0041] Fig.10 is a schematic diagram showing another embodiment of a display device.

[0042] Fig.11 It is shown that the Fig.10 Schematic cross-sectional view of a display panel in a display device. DETAILED DESCRIPTION

[0043] Embodiments of the present disclosure will now be described more fully below with reference to the accompanying drawings, in which various embodiments are shown. However, the present invention may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure will be thorough and complete and will fully convey the scope of the invention to those skilled in the art. The same reference numerals always refer to the same elements.

[0044] It will be understood that when an element is referred to as being "on" another element, the element can be directly on the other element or intervening elements may be present between the element and the other element. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements.

[0045] It will be understood that although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Therefore, without departing from the teachings herein, the first element, component, region, layer or section discussed below may be referred to as a second element, component, region, layer or section.

[0046] Unless the content clearly indicates otherwise, the terms used herein are only for the purpose of describing specific embodiments and are not intended to be limiting. As used herein, the singular forms "a", "one (kind / person)" and "the" are intended to include plural forms, including "at least one". "Or" means "and / or". As used herein, the term "and / or" includes any combination and all combinations of one or more related listed items. It will also be understood that the terms "comprises and / or comprising" or "includes and / or including" when used in this specification illustrate the presence of stated features, regions, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, components and / or their groups.

[0047] In addition, relative terms (such as "lower" or "bottom" and "upper" or "top") may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. It will be understood that, in addition to the orientation depicted in the accompanying drawings, the relative terms are intended to cover different orientations of the device. For example, if the device in one of the multiple drawings is turned over, the element described as being on the "lower" side of the other elements will then be oriented on the "upper" side of the other elements. Depending on the specific orientation of the drawings, the exemplary term "lower" can therefore cover both "lower" and "upper" orientations. Similarly, if the device in one of the multiple drawings is turned over, the element described as being "below" or "below" the other elements will then be oriented "above" the other elements. The exemplary terms "below" or "below" can therefore cover both the above and below orientations.

[0048] As used herein, "about" or "approximately" includes the stated value and means within the range of acceptable deviations for the particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, a term such as "about" may mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the stated value.

[0049] 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. It will also be understood that terms (such as those defined in general dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0050] Figure 1is a schematic diagram showing an example of a display device.

[0051] Reference Figure 1 , the display device DD may include a display panel DP and an optical panel OP. The optical panel OP may be disposed in front of the display panel DP. In an embodiment, for example, the optical panel OP may be disposed between the display panel DP and the user UR (e.g., the eyes of the user UR). That is, on a plane defined by a first direction D1 and a second direction D2 that are perpendicular to each other, the display panel DP and the optical panel OP may be sequentially aligned along a third direction D3 that is a normal direction of the plane. The optical panel OP may improve the immersion or three-dimensional effect by making the light emitted from the display panel DP appear wider.

[0052] Figure 2 It is shown that the Figure 1 Schematic cross-sectional view of a display panel in a display device.

[0053] Reference Figure 2 , the display panel DP may be a self-luminous display panel that emits light by itself. In an embodiment, for example, the display panel DP may include an organic light emitting device ("OLED") or an inorganic light emitting device ("ILED"), etc. Hereinafter, the description will focus on an embodiment in which the display panel DP includes an organic light emitting device ("OLED"). Figure 2 The light emitting device part LEP included in the display panel DP is schematically shown. The light emitting device part LEP may include a plurality of layers of the display panel DP, in which a light emitting device emitting light and a pixel circuit for driving the light emitting device are formed. The common electrode CTE of the light emitting device may be disposed at the uppermost portion of the light emitting device part LEP. Figure 2 In the figure, only the common electrode CTE of the light emitting device part LEP is shown in detail, and will be referred to later. Figure 4 A detailed cross-sectional structure of the light emitting device part LEP is described in more detail.

[0054] The first phase retardation layer PHL1, the absorption polarizer APOL, and the second phase retardation layer PHL2 may be sequentially disposed on the light emitting device part LEP. In an embodiment, a separate polarizer may not be disposed between the first phase retardation layer PHL1 and the absorption polarizer APOL. That is, light transmitted through the first phase retardation layer PHL1 may reach the absorption polarizer APOL without passing through a separate optical structure.

[0055] The first phase retardation layer PHL1 may have a first retardation axis and provide a phase difference of λ / 4 relative to the first retardation axis. Therefore, the first phase retardation layer PHL1 may retard light in the direction of the first retardation axis by λ / 4 to change linear polarized light into circular polarized light or change circular polarized light into linear polarized light. The first phase retardation layer PHL1 may have a reverse wavelength dispersion characteristic.

[0056] In an embodiment, the first phase retardation layer PHL1 may include a reverse wavelength dispersion film. In an embodiment, for example, the reverse wavelength dispersion film may be a film in which a first polymer having positive birefringence and a second polymer having negative birefringence are mixed. In an embodiment, for example, the first phase retardation layer PHL1 may be formed by blending a first polymer and a second polymer to produce an unstretched film, winding the unstretched film into a roll, and then stretching the unstretched film wound around the roll.

[0057] The embodiments of the present disclosure should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the present invention to those skilled in the art.

[0058] In an embodiment, the first polymer may include cycloolefin polymer, polycarbonate ("PC"), polyethylene terephthalate ("PET"), or a cellulosic polymer, etc. These may be used alone or in any combination with each other.

[0059] In an embodiment, the second polymer may include polystyrene, polyacrylate, polycarbonate, or acrylate-styrene copolymer, etc. These may be used alone or in any combination with each other.

[0060] In an embodiment, the first phase retardation layer PHL1 may include reverse wavelength dispersion liquid crystal. In an embodiment, for example, the reverse wavelength dispersion liquid crystal may be a liquid crystal in which a normal dispersion mesogen and a reverse dispersion mesogen are mixed.

[0061] In an embodiment, the first phase retardation layer PHL1 may have a single-layer structure. That is, the first phase retardation layer PHL1 may be a single-layer reverse wavelength dispersion film or a single-layer reverse wavelength dispersion liquid crystal.

[0062] In another embodiment, the first phase retardation layer PHL1 may have a multilayer structure. In an embodiment, for example, the first phase retardation layer PHL1 may have a structure in which two or more phase retardation layers having different retardation axes are sequentially stacked. The first phase retardation layer PHL1 may have a structure in which two or more reverse wavelength dispersion films are sequentially stacked. In addition, the first phase retardation layer PHL1 may have a structure in which two or more reverse wavelength dispersion liquid crystals are sequentially stacked. In addition, the first phase retardation layer PHL1 may have a structure including at least one reverse wavelength dispersion film and at least one reverse wavelength dispersion liquid crystal.

[0063] Since the first phase retardation layer PHL1 may have a reverse wavelength dispersion characteristic (regardless of the wavelength band of light emitted from the light emitting device portion LEP), the first phase retardation layer PHL1 may provide a phase difference of λ / 4 with respect to the first retardation axis. Therefore, the first phase retardation layer PHL1 may function as a phase retardation layer for light of various wavelength bands.

[0064] The absorption polarizer APOL may have a light absorption axis (absorption axis). The absorption polarizer APOL may absorb linear polarized light in the same direction as the absorption axis (i.e., polarized light of the light absorption axis). That is, linear polarized light in the same direction as the light absorption axis may not be transmitted through the absorption polarizer APOL. In addition, the absorption polarizer APOL may transmit linear polarized light perpendicular to the absorption axis. That is, the absorption polarizer APOL may have a transmission axis perpendicular to the light absorption axis.

[0065] The second phase retardation layer PHL2 may have a second retardation axis and provide a phase difference of λ / 4 relative to the second retardation axis. Therefore, the second phase retardation layer PHL2 may retard light in the direction of the second retardation axis by λ / 4 to change linear polarized light into circular polarized light or change circular polarized light into linear polarized light.

[0066] Return to reference Figure 1 , the optical panel OP may include a first lens portion LSP1 and a second lens portion LSP2. The first lens portion LSP1 may include a first lens LS1 and a beam splitter BSP. The second lens portion LSP2 may include a second lens LS2, a third phase retardation layer PHL3, and a reflective polarizer RPOL.

[0067] The first lens LS1 and the second lens LS2 may be curved lenses. The curved surface of each of the first lens LS1 and the second lens LS2 may be spherical or aspherical. Figure 1, opposite sides of the first lens LS1 are shown to be convex, but the shape of the first lens LS1 is not necessarily limited thereto. Each of the first lens LS1 and the second lens LS2 may include an optically isotropic material. In an embodiment, for example, each of the first lens LS1 and the second lens LS2 may include glass or polymethyl methacrylate ("PMMA"), etc.

[0068] The beam splitter BSP may be disposed on one side of the first lens LS1. In an embodiment, for example, the beam splitter BSP may be disposed on the user UR side of the first lens LS1. However, the present invention is not necessarily limited thereto, and the beam splitter BSP may be disposed on the display panel DP side of the first lens LS1.

[0069] The beam splitter BSP may transmit some of the incident light and reflect other of the incident light.The beam splitter BSP may reflect and transmit light regardless of the polarization properties of the light.

[0070] The third phase retardation layer PHL3 may be disposed on one side of the second lens LS2. In an embodiment, for example, the third phase retardation layer PHL3 may be disposed on the first lens portion LSP1 side of the second lens LS2. The third phase retardation layer PHL3 may have a third retardation axis and provide a phase difference of λ / 4 with respect to the third retardation axis. Therefore, the third phase retardation layer PHL3 may retard light in the direction of the third retardation axis by λ / 4 to change linear polarized light into circular polarized light or change circular polarized light into linear polarized light.

[0071] The reflective polarizer RPOL may be disposed on the other side of the second lens LS2. In an embodiment, for example, the reflective polarizer RPOL may be disposed on the user UR side of the second lens LS2. The reflective polarizer RPOL may have a reflection axis. The reflective polarizer RPOL may reflect linear polarized light in the same direction as the reflection axis. That is, linear polarized light in the same direction as the reflection axis may not be transmitted through the reflective polarizer RPOL. In addition, the reflective polarizer RPOL may transmit linear polarized light perpendicular to the reflection axis. That is, the reflective polarizer RPOL may have a transmission axis perpendicular to the reflection axis.

[0072] In an embodiment, the light absorption axis of the absorbing polarizer APOL and the reflection axis of the reflecting polarizer RPOL may have the same direction as each other.

[0073] Figure 3 It is schematically shown from Figure 1 A diagram showing the path of light emitted by a display device.

[0074] In the following, reference Figure 3 , the display device DD (refer to Figure 1 ) is a path through which light emitted from the display panel DP passes through the optical panel OP to reach the user UR.

[0075] exist Figure 3 In the embodiment, for the convenience of explanation, each layer is shown as having a flat structure, but in an actual structure, the components of the optical panel OP may have a corresponding Figure 1 curved surface.

[0076] In addition, Figure 3 In the figure, for the convenience of explanation, only the common electrode CTE of the light emitting device part LEP is shown in detail. The detailed cross-sectional structure of the light emitting device part LEP will be referred to later. Figure 4 Describe in more detail.

[0077] Further references Figure 1 and Figure 3 , light emitted from the display panel DP may be transmitted through the first lens portion LSP1 and the second lens portion LSP2, respectively, and provided to the user UR. Light emitted from the display panel DP may be bent (e.g., refracted) by the first lens LS1 and the second lens LS2, and then reach the user UR. Therefore, the user UR may observe an image larger than the size of the display panel DP. Therefore, the degree to which the user UR is immersed in the image may be improved, and the three-dimensional effect of the image may also be improved.

[0078] The common electrode CTE of the light emitting device part LEP may have a semi-transmissive reflective property. That is, the common electrode CTE may reflect some of the incident light. In an embodiment, for example, the common electrode CTE may reflect about 50% of the incident light. However, the present invention is not necessarily limited thereto, and the reflectivity of the common electrode CTE may vary according to the embodiment.

[0079] The first phase retardation layer PHL1, the absorption polarizer APOL, and the second phase retardation layer PHL2 may be sequentially disposed on the common electrode CTE along the third direction D3. In an embodiment, the first phase retardation layer PHL1 may be disposed at about 45 degrees with respect to a light absorption axis of the absorption polarizer APOL.

[0080] exist Figure 3 In the IEEE Spectrum Distributor (ODD), each light beam is assigned a number, and the characteristics of the light are described according to the order of the numbers.

[0081] First, referring to the first light (refer to Figure 3 In the first light 1), light emitted from the common electrode CTE of the light emitting device part LEP in the third direction D3 may have polarization characteristics in all directions.

[0082] Refer to the second light (refer to Figure 3The first light may be transmitted through the first phase retardation layer PHL1. Since the first light has polarization characteristics in all directions, the second light also has polarization characteristics in all directions even when the first phase retardation layer PHL1 provides a delay of λ / 4 with respect to the first delay axis.

[0083] Refer to the third light (refer to Figure 3 The third light 3) in the second light may be incident on the absorption polarizer APOL. Among the second light, linear polarized light in the same direction as the absorption axis of the absorption polarizer APOL may be absorbed by the absorption polarizer APOL, and linear polarized light perpendicular to the absorption axis may be transmitted through the absorption polarizer APOL. That is, the third light may be light that has been transmitted through the absorption polarizer APOL among the second light, and may be linear polarized light perpendicular to the absorption axis.

[0084] Refer to the fourth light (refer to Figure 3 The fourth light 4 in the third light may be incident on the second phase delay layer PHL2. When the third light is incident on the second phase delay layer PHL2, a delay may be provided only for the second delay axis, so that the linear polarized light is changed into circular polarized light and can be transmitted. That is, the fourth light may be light among the third light that has been transmitted through the second phase delay layer PHL2, and may be circularly polarized light.

[0085] Refer to the Fifth Light (ref. Figure 3 The fifth light 5) and the sixth light (refer to Figure 3 The sixth light 6 in the beam splitter BSP), the fourth light may be incident on the beam splitter BSP. When the fourth light is incident on the beam splitter BSP, some of the fourth light may be transmitted through the beam splitter BSP, and the other of the fourth light may be reflected from the beam splitter BSP. Among the fourth light, the light transmitted through the beam splitter BSP is also referred to as the fifth light, and the light reflected from the beam splitter BSP is also referred to as the sixth light. At this time, the phase of the light transmitted through the beam splitter BSP does not change, and the phase of the light reflected from the beam splitter BSP may be halved by about 180 degrees. That is, the fifth light may be circularly polarized light in the same direction as the fourth light, and the sixth light may be circularly polarized light in the opposite direction to the fourth light.

[0086] Refer to the Seventh Light (ref. Figure 3 The sixth light may be incident on the second phase delay layer PHL2. When the sixth light is incident on the second phase delay layer PHL2, a delay may be provided only for the second delay axis, so that the circularly polarized light is changed into a linearly polarized light and can be transmitted. That is, the seventh light may be light among the sixth light that has been transmitted through the second phase delay layer PHL2, and may be a linearly polarized light.

[0087] The linear polarization direction of the seventh light may be opposite to the linear polarization direction of the third light. That is, since the seventh light is the light among the sixth light that has been transmitted through the second phase delay layer PHL2, the phase of the sixth light has been reversed by about 180 degrees by the beam splitter BSP, so the linear polarization direction of the seventh light may be opposite to the linear polarization direction of the third light. Therefore, the linear polarization direction of the seventh light may be the same as the light absorption axis of the absorption polarizer APOL. Therefore, the seventh light may be absorbed by the absorption polarizer APOL. In other words, the seventh light may not be transmitted through the absorption polarizer APOL.

[0088] As a result, among the light incident from the display panel DP to the beam splitter BSP, since the light reflected from the beam splitter BSP is absorbed by the absorptive polarizer APOL and disappears, the light may be invisible to the user UR.

[0089] In an embodiment, for example, assuming that the absorption axis of the absorption polarizer APOL is about 0 degrees, and the second phase retardation layer PHL2 provides retardation only in the 45 degree direction with respect to the retardation axis, the third light may be about 90 degrees of linear polarized light, the fourth light may be left-circularly polarized light, the sixth light may be right-circularly polarized light, and the seventh light may be about 0 degrees of linear polarized light. Therefore, the seventh light may be absorbed by the absorption polarizer APOL.

[0090] Refer to the eighth light (refer to Figure 3 The eighth light 8 in the fifth light may be incident on the third phase delay layer PHL3. When the fifth light is incident on the third phase delay layer PHL3, a delay may be provided only for the third delay axis, so that the circularly polarized light may be changed into a linearly polarized light and may be transmitted. That is, the eighth light may be light among the fifth light that has been transmitted through the third phase delay layer PHL3, and may be a linearly polarized light.

[0091] Refer to the Ninth Light (ref. Figure 3 The ninth light 9), the eighth light may be incident on the reflective polarizer RPOL. Among the eighth light, linear polarized light in the same direction as the reflection axis of the reflective polarizer RPOL may be reflected from the reflective polarizer RPOL, and linear polarized light perpendicular to the reflection axis may be transmitted through the reflective polarizer RPOL. That is, the ninth light may be light reflected from the reflective polarizer RPOL among the eighth light, and may be linear polarized light in the same direction as the reflection axis.

[0092] In an embodiment, for example, assuming that the absorption axis of the absorption polarizer APOL is approximately 0 degrees, the third phase delay layer PHL3 provides delay only in the 45 degree direction with respect to the delay axis, and the reflection axis of the reflective polarizer RPOL is approximately 0 degrees, the third light can be approximately 90 degrees of linear polarized light, the fourth light can be left-handed circularly polarized light, the fifth light can be left-handed circularly polarized light, the eighth light can be approximately 0 degrees of linear polarized light, and the ninth light can be approximately 0 degrees of linear polarized light.

[0093] Refer to the Tenth Light (ref. Figure 3 The tenth light 10 in the third phase retarder layer PHL3), the ninth light may be incident on the third phase retarder layer PHL3. When the ninth light is incident on the third phase retarder layer PHL3, a delay may be provided only for the third delay axis, so that the linear polarized light may be changed into circular polarized light and may be transmitted. That is, the tenth light may be light among the ninth light that has been transmitted through the third phase retarder layer PHL3, and may be circularly polarized light.

[0094] Refer to the eleventh light (ref. Figure 3 The eleventh light 11) and the twelfth light (refer to Figure 3 The twelfth light 12 in the beam splitter BSP), the tenth light may be incident on the beam splitter BSP. When the tenth light is incident on the beam splitter BSP, some of the tenth light may be transmitted through the beam splitter BSP, and the other of the tenth light may be reflected from the beam splitter BSP. Among the tenth light, the light transmitted through the beam splitter BSP is also referred to as the eleventh light, and the light reflected from the beam splitter BSP is also referred to as the twelfth light. At this time, the phase of the light transmitted through the beam splitter BSP does not change, and the phase of the light reflected from the beam splitter BSP may be halved by about 180 degrees. That is, the eleventh light may be circularly polarized light in the same direction as the tenth light, and the twelfth light may be circularly polarized light in the opposite direction to the tenth light.

[0095] Refer to the Thirteenth Light (ref. Figure 3 The thirteenth light 13 in the third phase retarder layer PHL3), the twelfth light may be incident on the third phase retarder layer PHL3. When the twelfth light is incident on the third phase retarder layer PHL3, a delay may be provided only for the third delay axis, so that the circularly polarized light may be changed into a linearly polarized light and may be transmitted. That is, the thirteenth light may be light among the twelfth light that has been transmitted through the third phase retarder layer PHL3, and may be a linearly polarized light.

[0096] At this time, the linear polarization direction of the thirteenth light may be opposite to the linear polarization direction of the eighth light. That is, since the thirteenth light is the light that has been transmitted through the third phase delay layer PHL3 among the twelfth light, the phase of the twelfth light has been reversed by about 180 degrees by the beam splitter BSP, so the linear polarization direction of the thirteenth light may be opposite to the linear polarization direction of the eighth light. Therefore, the linear polarization direction of the thirteenth light may be perpendicular to the reflection axis of the reflective polarizer RPOL. In other words, the linear polarization direction of the thirteenth light may be the same as the transmission axis of the reflective polarizer RPOL. Therefore, the thirteenth light may be transmitted through the reflective polarizer RPOL.

[0097] In an embodiment, for example, assuming that the third phase retardation layer PHL3 provides retardation only in the 45 degree direction with respect to the retardation axis, and the reflection axis of the reflective polarizer RPOL is about 0 degree, the eighth light and the ninth light may be linear polarized light of about 0 degree, the eleventh light may be left-handed circularly polarized light, the twelfth light may be right-handed circularly polarized light, and the thirteenth light may be linearly polarized light of about 90 degrees. Therefore, the thirteenth light may be transmitted through the reflective polarizer RPOL.

[0098] Refer to the fourteenth light (ref. Figure 3 The fourteenth light 14 in the image may be light among the thirteenth light that has been transmitted through the reflective polarizer RPOL, and may be linearly polarized light in a direction perpendicular to the reflection axis. The fourteenth light may be provided to the user UR.

[0099] Refer to the fifteenth light (refer to Figure 3 The eleventh light may be incident on the second phase delay layer PHL2. When the eleventh light is incident on the second phase delay layer PHL2, a delay may be provided only for the second delay axis, so that the circularly polarized light may be changed into a linearly polarized light and may be transmitted. That is, the fifteenth light may be the light among the eleventh light that has been transmitted through the second phase delay layer PHL2, and may be a linearly polarized light.

[0100] Refer to the sixteenth light (refer to Figure 3 The sixteenth light 16 in the absorption polarizer APOL) may be incident on the absorption polarizer APOL. Among the fifteenth light, linear polarized light in the same direction as the absorption axis of the absorption polarizer APOL may be absorbed by the absorption polarizer APOL, and linear polarized light perpendicular to the absorption axis may be transmitted through the absorption polarizer APOL. That is, the sixteenth light may be light among the fifteenth light that has been transmitted through the absorption polarizer APOL, and may be linear polarized light perpendicular to the absorption axis.

[0101] Refer to the seventeenth light (refer to Figure 3The seventeenth light 17 in the first phase retarder layer PHL1) may be incident on the first phase retarder layer PHL1. When the sixteenth light is incident on the first phase retarder layer PHL1, a delay may be provided only for the first delay axis, so that the linear polarized light may be changed into circular polarized light and may be transmitted. That is, the seventeenth light may be light among the sixteenth light that has been transmitted through the first phase retarder layer PHL1, and may be circular polarized light.

[0102] Refer to the eighteenth light (refer to Figure 3 The eighteenth light 18 in the common electrode CTE, the seventeenth light may be incident on the common electrode CTE. The common electrode CTE may reflect the seventeenth light. That is, the eighteenth light may be light obtained when the seventeenth light is reflected by the common electrode CTE. At this time, the phase of the light may be reversed by about 180 degrees. Therefore, the eighteenth light may be circularly polarized light in the opposite direction to the seventeenth light.

[0103] Refer to the nineteenth light (ref. Figure 3 The nineteenth light 19 in the first phase retarder layer PHL1) may be incident on the eighteenth light. When the eighteenth light is incident on the first phase retarder layer PHL1, a delay may be provided only for the first delay axis, so that the circularly polarized light may be changed into a linearly polarized light and may be transmitted. That is, the nineteenth light may be light among the eighteenth light that has been transmitted through the first phase retarder layer PHL1, and may be a linearly polarized light.

[0104] At this time, the linear polarization direction of the nineteenth light may be opposite to the linear polarization direction of the sixteenth light. That is, since the nineteenth light is the light that has been transmitted through the first phase delay layer PHL1 among the eighteenth light, the phase of the eighteenth light has been reversed by about 180 degrees by the common electrode CTE, and therefore the linear polarization direction of the nineteenth light may be opposite to the linear polarization direction of the sixteenth light. Therefore, the linear polarization direction of the nineteenth light may be the same as the light absorption axis of the absorption polarizer APOL. Therefore, the nineteenth light may be absorbed by the absorption polarizer APOL. In other words, the nineteenth light may not be transmitted through the absorption polarizer APOL.

[0105] In an embodiment, for example, assuming that the absorption axis of the absorption polarizer APOL is about 0 degrees, and the first phase retardation layer PHL1 and the second phase retardation layer provide retardation only in the 45 degree direction with respect to the retardation axis, the eleventh light may be left-handed circularly polarized light, the fifteenth light and the sixteenth light may be linearly polarized light of about 90 degrees, the eighteenth light may be left-handed circularly polarized light, and the nineteenth light may be linearly polarized light of about 0 degrees. Therefore, the nineteenth light may be absorbed by the absorption polarizer APOL.

[0106] As a result, the light reflected from the common electrode CTE of the display panel DP may be substantially invisible to the user UR because it is absorbed by the absorptive polarizer APOL and disappears. Therefore, the appearance of a virtual image due to reflection of the common electrode CTE may be reduced or prevented.

[0107] In particular, since a separate polarizer is not provided between the first phase retardation layer PHL1 and the absorption polarizer APOL, the light reflected from the common electrode CTE of the display panel DP may be transmitted through the first phase retardation layer PHL1 and directly absorbed by the absorption polarizer APOL. Therefore, the light reflected from the common electrode CTE of the display panel DP may disappear more easily through the absorption polarizer APOL.

[0108] Figure 4 It is shown that the Figure 1 A cross-sectional view of a display panel in a display device.

[0109] In the following, reference Figure 4 The display panel DP (refer to Figure 1 ) cross-sectional structure.

[0110] Reference Figure 4 , the display panel DP may include a driving substrate DSUB, an insulating layer IL, a pixel connection pattern CP, a light emitting device LED, a pixel defining layer PDL, an encapsulation layer ENC, a first phase delay layer PHL1, an absorption polarizer APOL, and a second phase delay layer PHL2. Here, the light emitting device LED may include a pixel electrode ADE, a light emitting layer EML, and a common electrode CTE.

[0111] In an embodiment, the display panel DP may be an ultra-small light emitting diode display panel (or a micro light emitting diode display panel) including ultra-small light emitting diodes (or micro light emitting diodes) as light emitting diodes. However, the present invention is not necessarily limited thereto.

[0112] The driving substrate DSUB may be a semiconductor circuit board. In an embodiment, for example, the driving substrate DSUB may have a structure in which the pixel circuit part PXC is disposed on a silicon wafer. That is, the silicon wafer may be a supporting member for supporting components of the display panel DP. The pixel circuit part PXC may include at least one transistor.

[0113] The insulating layer IL may be disposed on the driving substrate DSUB. In an embodiment, the insulating layer IL may define a contact hole penetrating the insulating layer IL. The insulating layer IL may include an organic material. In an embodiment, the organic material included in the insulating layer IL may include a photoresist, a polyacrylic resin, a polyimide resin, or an acrylic resin, etc. These may be used alone or in any combination with each other.

[0114] The pixel connection pattern CP may be filled in the contact hole. The pixel connection pattern CP may be electrically connected to the pixel circuit portion PXC. The pixel connection pattern CP may include a conductive material. In an embodiment, for example, the pixel connection pattern CP may include tungsten (W).

[0115] The pixel electrode ADE may be disposed on the insulating layer IL. The pixel electrode ADE may be electrically connected to the pixel circuit portion PXC through the pixel connection pattern CP. Therefore, the pixel electrode ADE may receive a voltage from the pixel circuit portion PXC. In an embodiment, for example, the pixel electrode ADE may serve as an anode.

[0116] The pixel defining layer PDL may be disposed on the insulating layer IL and the pixel electrode ADE. The pixel defining layer PDL may expose at least a portion of the pixel electrode ADE.

[0117] The light emitting layer EML may be disposed on the pixel electrode ADE exposed from the pixel defining layer PDL. The light emitting layer EML may include an organic material that emits light. However, the present invention is not necessarily limited thereto.

[0118] The common electrode CTE may be disposed on the light emitting layer EML and the pixel defining layer PDL. The common electrode CTE may include a conductive material. In an embodiment, the conductive material used as the common electrode CTE may include lithium, calcium, aluminum, silver, or magnesium, etc. These may be used alone or in any combination with each other. In an embodiment, for example, the common electrode CTE may serve as a cathode.

[0119] Figure 4 The structure of the display panel DP shown in FIG. 1 is an example and may be changed in various ways according to the embodiment.

[0120] Figure 5 is a schematic diagram showing another embodiment of a display device. Figure 6 It is shown that the Figure 5 Schematic cross-sectional view of a display panel in a display device.

[0121] Reference Figure 5 and Figure 6 , except that the display panel DP' further includes the reflective polarizer RPOL', and the second lens portion LSP2' includes the absorptive polarizer (eg, the second absorptive polarizer APOL2), the display device DD' may be similar to Figure 1 and Figure 2 The display devices DD are substantially the same or similar. Therefore, overlapping descriptions are omitted or simplified.

[0122] The display device DD' may include a display panel DP' and an optical panel OP'. The optical panel OP' may be disposed in front of the display panel DP'. In an embodiment, for example, the optical panel OP' may be disposed between the display panel DP' and the user UR (eg, eyes of the user UR).

[0123] Figure 6 The light emitting device section LEP' included in the display panel DP' is schematically shown. The light emitting device section LEP' may include a plurality of layers of the display panel DP', in which a light emitting device emitting light and a pixel circuit for driving the light emitting device are formed. The common electrode CTE' of the light emitting device may be disposed at the uppermost portion of the light emitting device section LEP'. The detailed cross-sectional structure may be similar to that of reference 1. Figure 4 The cross-sectional structures of the light emitting device parts LEP described are substantially the same, and therefore, detailed description is omitted.

[0124] The first phase retardation layer PHL1', the first absorption polarizer APOL1, the reflection polarizer RPOL', and the second phase retardation layer PHL2' may be sequentially disposed on the light emitting device portion LEP'. In an embodiment, a separate polarizer may not be disposed between the first phase retardation layer PHL1' and the first absorption polarizer APOL1. That is, light transmitted through the first phase retardation layer PHL1' may reach the first absorption polarizer APOL1 without passing through a separate optical structure.

[0125] The first phase retardation layer PHL1′ can be Figure 2 The first phase retardation layer PHL1 described above is substantially the same, and the reflective polarizer RPOL' may be the same as that described in reference Figure 1 The reflective polarizer RPOL described above is substantially the same, and the second phase retardation layer PHL2' may be the same as that of reference Figure 2 The second phase retardation layer PHL2 is described to be substantially the same, and therefore, a detailed description is omitted.

[0126] That is, the first phase retardation layer PHL1 ′ may have a first retardation axis, the reflective polarizer RPOL′ may have a reflection axis, and the second phase retardation layer PHL2 ′ may have a second retardation axis.

[0127] The first absorption polarizer APOL1 may have a first light absorption axis (first absorption axis). The first absorption polarizer APOL1 may absorb linear polarized light in the same direction as the first absorption axis. That is, linear polarized light in the same direction as the first absorption axis may not be transmitted through the first absorption polarizer APOL1. In addition, the first absorption polarizer APOL1 may transmit linear polarized light perpendicular to the first absorption axis. That is, the first absorption polarizer APOL1 may have a transmission axis perpendicular to the first absorption axis.

[0128] like Figure 5 As shown in FIG. 1 , the optical panel OP′ may include a first lens portion LSP1′ and a second lens portion LSP2′. The first lens portion LSP1′ may be aligned with the reference lens portion LSP2′. Figure 1 That is, the first lens LS1' of the first lens portion LSP1' can be substantially the same as the first lens portion LSP1' described above. Figure 1 The first lens LS1 is substantially the same as that of the beam splitter BSP'. Figure 1 The beam splitter BSP is substantially the same as that of FIG. 1 , and therefore, a detailed description is omitted.

[0129] The second lens portion LSP2' may include a second lens LS2', a third phase retardation layer PHL3', and a second absorbing polarizer APOL2. Figure 1 The second lens LS2 described above is substantially the same, and the third phase retardation layer PHL3' can be the same as that of reference Figure 1 The third phase retardation layer PHL3 described is substantially the same, and therefore, the overlapping description is omitted.

[0130] The second absorption polarizer APOL2 may be disposed on the user UR side of the second lens LS2'. The second absorption polarizer APOL2 may have a second light absorption axis (second absorption axis). The second absorption polarizer APOL2 may absorb linear polarized light in the same direction as the second absorption axis. That is, linear polarized light in the same direction as the second absorption axis may not be transmitted through the second absorption polarizer APOL2. In addition, the second absorption polarizer APOL2 may transmit linear polarized light perpendicular to the second absorption axis. That is, the second absorption polarizer APOL2 may have a transmission axis perpendicular to the second light absorption axis.

[0131] In an embodiment, the first light absorption axis of the first absorbing polarizer APOL1, the reflection axis of the reflective polarizer RPOL', and the second light absorption axis of the second absorbing polarizer APOL2 may have the same direction as each other.

[0132] Figure 7 It is schematically shown from Figure 5A diagram showing the path of light emitted by a display device.

[0133] In the following, reference Figure 7 , the display device DD' (refer to Figure 5 ) is a path through which light emitted from the display panel DP' reaches the user UR via the optical panel OP'.

[0134] exist Figure 7 In the embodiment, for the convenience of explanation, each layer is shown as having a flat structure, but in an actual structure, the components of the optical panel OP' may have corresponding Figure 5 curved surface.

[0135] In addition, Figure 7 In the figure, for the convenience of explanation, only the common electrode CTE' of the light emitting device part LEP' is shown in detail.

[0136] Further references Figure 5 and Figure 7 , light emitted from the display panel DP' may be transmitted through the first lens portion LSP1' and the second lens portion LSP2', respectively, and provided to the user UR. Light emitted from the display panel DP' may be bent (e.g., refracted) by the first lens LS1' and the second lens LS2', and then reach the user UR. Therefore, the user UR may observe an image larger than the size of the display panel DP'. Therefore, the degree to which the user UR is immersed in the image may be improved, and the three-dimensional effect of the image may also be improved.

[0137] The common electrode CTE' of the light emitting device part LEP' may have a semi-transmissive reflective property. That is, the common electrode CTE' may reflect some of the incident light. In an embodiment, for example, the common electrode CTE' may reflect about 50% of the incident light. However, the present invention is not necessarily limited thereto, and the reflectivity of the common electrode CTE' may vary depending on the embodiment.

[0138] The first phase retardation layer PHL1', the first absorption polarizer APOL1, the reflection polarizer RPOL' and the second phase retardation layer PHL2' may be sequentially disposed on the common electrode CTE' along the third direction D3. In an embodiment, the first phase retardation layer PHL1' may be disposed at about 45 degrees relative to the first light absorption axis of the first absorption polarizer APOL1.

[0139] exist Figure 7 In the IEEE Spectrum Distributor (ODD), each light beam is assigned a number, and the characteristics of the light are described according to the order of the numbers.

[0140] First, referring to the first light (refer to Figure 7In the first light 1), the light emitted from the common electrode CTE' of the light emitting device part LEP' in the third direction D3 may have polarization characteristics in all directions.

[0141] Refer to the second light (refer to Figure 7 The first light can be transmitted through the first phase retardation layer PHL1'. Since the first light has polarization characteristics in all directions, even when the first phase retardation layer PHL1' provides a delay of λ / 4 relative to the first delay axis, the second light also has polarization characteristics in all directions.

[0142] Refer to the third light (refer to Figure 7 The third light 3) in the second light may be incident on the first absorption polarizer APOL1. Among the second light, linear polarized light in the same direction as the first absorption axis of the first absorption polarizer APOL1 may be absorbed by the first absorption polarizer APOL1, and linear polarized light perpendicular to the first absorption axis may be transmitted through the first absorption polarizer APOL1. That is, the third light may be light among the second light that has been transmitted through the first absorption polarizer APOL1, and may be linear polarized light perpendicular to the first absorption axis.

[0143] Refer to the fourth light (refer to Figure 7 The fourth light 4) in the third light may be incident on the reflective polarizer RPOL'. Among the third light, linear polarized light in the same direction as the reflection axis of the reflective polarizer RPOL' may be reflected from the reflective polarizer RPOL', and linear polarized light perpendicular to the reflection axis may be transmitted through the reflective polarizer RPOL'. That is, the fourth light may be light among the third light that has been transmitted through the reflective polarizer RPOL', and may be linear polarized light perpendicular to the reflection axis.

[0144] Refer to the Fifth Light (ref. Figure 7 The fifth light 5 in the fourth light may be incident on the second phase delay layer PHL2'. When the fourth light is incident on the second phase delay layer PHL2', a delay may be provided only for the second delay axis, so that the linear polarized light is changed into circular polarized light and can be transmitted. That is, the fifth light may be the light among the fourth light that has been transmitted through the second phase delay layer PHL2', and may be circularly polarized light.

[0145] Refer to the Sixth Light (refer to Figure 7 The sixth light 6) and the seventh light (refer to Figure 7The seventh light 7), the fifth light may be incident on the beam splitter BSP'. When the fifth light is incident on the beam splitter BSP', some of the fifth light may be transmitted through the beam splitter BSP', and the other of the fifth light may be reflected from the beam splitter BSP'. Among the fifth light, the light transmitted through the beam splitter BSP' is also referred to as the sixth light, and the light reflected from the beam splitter BSP' is also referred to as the seventh light. At this time, the phase of the light transmitted through the beam splitter BSP' does not change, and the phase of the light reflected from the beam splitter BSP' may be halved by approximately 180 degrees. That is, the sixth light may be a circularly polarized light in the same direction as the fifth light, and the seventh light may be a circularly polarized light in the opposite direction to the fifth light.

[0146] Refer to the eighth light (refer to Figure 7 The eighth light 8 in the sixth light may be incident on the third phase delay layer PHL3'. When the sixth light is incident on the third phase delay layer PHL3', a delay may be provided only for the third delay axis, so that the circularly polarized light is changed into a linearly polarized light and can be transmitted. That is, the eighth light may be the light among the sixth light that has been transmitted through the third phase delay layer PHL3', and may be a linearly polarized light.

[0147] At this time, the linear polarization direction of the eighth light may be opposite to the linear polarization direction of the third light. That is, since the eighth light is light obtained as the third light sequentially transmits through the reflective polarizer RPOL', the second phase retardation layer PHL2', the beam splitter BSP' and the third phase retardation layer PHL3', the linear polarization direction of the eighth light may be opposite to the linear polarization direction of the third light. Therefore, the linear polarization direction of the eighth light may be the same as the light absorption axis of the second absorption polarizer APOL2. Therefore, the eighth light may be absorbed by the second absorption polarizer APOL2. In other words, the eighth light may not be transmitted through the second absorption polarizer APOL2.

[0148] In an embodiment, for example, assuming that the first absorption axis of the first absorption polarizer APOL1, the reflection axis of the reflection polarizer RPOL', and the second absorption axis of the second absorption polarizer APOL2 are about 0 degrees, and each of the second phase retardation layer PHL2' and the third phase retardation layer PHL3' provides retardation only in the 45 degree direction with respect to the retardation axis, the third light and the fourth light may be linear polarized light of about 90 degrees, the fifth light and the sixth light may be left-handed circularly polarized light, and the eighth light may be linear polarized light of about 0 degrees. Therefore, the eighth light may not be transmitted through the second absorption polarizer APOL2.

[0149] Refer to the Ninth Light (ref. Figure 7The ninth light 9 in the second phase delay layer PHL2' may be incident on the second phase delay layer PHL2'. When the seventh light is incident on the second phase delay layer PHL2', a delay may be provided only for the second delay axis, so that the circularly polarized light is changed into a linearly polarized light and can be transmitted. That is, the ninth light may be the light among the seventh light that has been transmitted through the second phase delay layer PHL2', and may be a linearly polarized light.

[0150] Refer to the Tenth Light (ref. Figure 7 The tenth light 10) in the reflective polarizer RPOL', the ninth light may be incident on the reflective polarizer RPOL'. Among the ninth light, linear polarized light in the same direction as the reflection axis of the reflective polarizer RPOL' may be reflected from the reflective polarizer RPOL', and linear polarized light perpendicular to the reflection axis may be transmitted through the reflective polarizer RPOL'. That is, the tenth light may be light reflected from the reflective polarizer RPOL' among the ninth light, and may be linear polarized light in the same direction as the reflection axis.

[0151] In an embodiment, for example, assuming that the first absorption axis of the first absorption polarizer APOL1 and the reflection axis of the reflective polarizer RPOL' are approximately 0 degrees, and the second phase delay layer PHL2' provides delay only in the 45 degree direction with respect to the delay axis, the third light and the fourth light can be linearly polarized lights of approximately 90 degrees, the fifth light and the sixth light can be left-handed circularly polarized lights, the seventh light can be right-handed circularly polarized light, the ninth light can be linearly polarized light of approximately 0 degrees, and the tenth light can be linearly polarized light of approximately 0 degrees.

[0152] Refer to the eleventh light (ref. Figure 7 The eleventh light 11 in the second phase retarder layer PHL2' may be incident on the second phase retarder layer PHL2'. When the tenth light is incident on the second phase retarder layer PHL2', a delay may be provided only for the second delay axis, so that the linear polarized light is changed into circular polarized light and can be transmitted. That is, the eleventh light may be the light among the tenth light that has been transmitted through the second phase retarder layer PHL2', and may be circularly polarized light.

[0153] Refer to the twelfth light (refer to Figure 7 The twelfth light 12) and the thirteenth light (refer to Figure 7The thirteenth light 13) in the beam splitter BSP', the eleventh light may be incident on the beam splitter BSP'. When the eleventh light is incident on the beam splitter BSP', some of the eleventh light may be transmitted through the beam splitter BSP', and the other of the eleventh light may be reflected from the beam splitter BSP'. Among the eleventh light, the light transmitted through the beam splitter BSP' is also referred to as the twelfth light, and the light reflected from the beam splitter BSP' is also referred to as the thirteenth light. At this time, the phase of the light transmitted through the beam splitter BSP' does not change, and the phase of the light reflected from the beam splitter BSP' may be halved by approximately 180 degrees. That is, the twelfth light may be a circularly polarized light in the same direction as the eleventh light, and the thirteenth light may be a circularly polarized light in the opposite direction to the eleventh light.

[0154] Refer to the fourteenth light (ref. Figure 7 The fourteenth light 14 in the third phase retarder layer PHL3', the twelfth light may be incident on the third phase retarder layer PHL3'. When the twelfth light is incident on the third phase retarder layer PHL3', a delay may be provided only for the third delay axis, so that the circularly polarized light may be changed into a linearly polarized light and may be transmitted. That is, the fourteenth light may be the light among the twelfth light that has been transmitted through the third phase retarder layer PHL3', and may be a linearly polarized light.

[0155] At this time, the linear polarization direction of the fourteenth light may be opposite to the linear polarization direction of the eighth light. Therefore, the linear polarization direction of the fourteenth light may be perpendicular to the second absorption axis of the second absorption polarizer APOL2. In other words, the linear polarization direction of the fourteenth light may be the same as the transmission axis of the second absorption polarizer APOL2. Therefore, the fourteenth light may be transmitted through the second absorption polarizer APOL2.

[0156] In an embodiment, assuming that the second absorption axis of the second absorbing polarizer APOL2 is about 0 degrees, the eighth light may be linearly polarized light of about 0 degrees, and the fourteenth light may be left-handed circularly polarized light. Therefore, for example, the fourteenth light may be transmitted through the second absorbing polarizer APOL2.

[0157] Refer to the fifteenth light (refer to Figure 7 The fifteenth light 15 in the fourteenth light may be light that has been transmitted through the second absorption polarizer APOL2 among the fourteenth light, and may be linearly polarized light in a direction perpendicular to the second absorption axis. The fifteenth light may be provided to the user UR.

[0158] Refer to the sixteenth light (refer to Figure 7The sixteenth light 16 in the second phase retarder layer PHL2' may be incident on the second phase retarder layer PHL2'. When the thirteenth light is incident on the second phase retarder layer PHL2', a delay may be provided only for the second delay axis, so that the circularly polarized light may be changed into a linearly polarized light and may be transmitted. That is, the sixteenth light may be light among the thirteenth light that has been transmitted through the second phase retarder layer PHL2', and may be a linearly polarized light.

[0159] Refer to the seventeenth light (refer to Figure 7 The seventeenth light 17) in the reflective polarizer RPOL', the sixteenth light may be incident on the reflective polarizer RPOL'. Among the sixteenth light, linear polarized light in the same direction as the reflection axis of the reflective polarizer RPOL' may be reflected from the reflective polarizer RPOL', and linear polarized light perpendicular to the reflection axis may be transmitted through the reflective polarizer RPOL'. That is, the seventeenth light may be light among the sixteenth light that has been transmitted through the reflective polarizer RPOL', and may be linear polarized light perpendicular to the reflection axis.

[0160] Refer to the eighteenth light (refer to Figure 7 The eighteenth light 18) of the first absorption polarizer APOL1 may be incident on the first absorption polarizer APOL1. Among the seventeenth light, linear polarized light in the same direction as the first absorption axis of the first absorption polarizer APOL1 may be absorbed by the first absorption polarizer APOL1, and linear polarized light perpendicular to the first absorption axis may be transmitted through the first absorption polarizer APOL1. That is, the eighteenth light may be light among the seventeenth light that has been transmitted through the first absorption polarizer APOL1, and may be linear polarized light perpendicular to the first absorption axis.

[0161] In an embodiment, for example, assuming that the reflection axis of the reflective polarizer RPOL' and the first absorption axis of the first absorption polarizer APOL1 are about 0 degrees, the sixteenth light and the seventeenth light may be linearly polarized light of about 90 degrees. Therefore, the sixteenth light may be transmitted through the reflective polarizer RPOL', and the seventeenth light may be transmitted through the first absorption polarizer APOL1. Therefore, the eighteenth light may be linearly polarized light of about 90 degrees.

[0162] Refer to the nineteenth light (ref. Figure 7 The nineteenth light 19 in the first phase retarder layer PHL1', the eighteenth light may be incident on the first phase retarder layer PHL1'. When the eighteenth light is incident on the first phase retarder layer PHL1', a delay may be provided only for the first delay axis, so that the linearly polarized light may be changed into circularly polarized light and may be transmitted. That is, the nineteenth light may be the light among the eighteenth light that has been transmitted through the first phase retarder layer PHL1', and may be circularly polarized light.

[0163] Refer to the 20th light (ref. Figure 7 The twentieth light 20 in the common electrode CTE', the nineteenth light may be incident on the common electrode CTE'. The common electrode CTE' may reflect the nineteenth light. That is, the twentieth light may be light obtained when the nineteenth light is reflected by the common electrode CTE'. At this time, the phase of the light may be reversed by about 180 degrees. Therefore, the twentieth light may be circularly polarized light in the opposite direction to the nineteenth light.

[0164] Refer to the twenty-first light (refer to Figure 7 The 21st light 21 in the first phase retarder layer PHL1' may be incident on the first phase retarder layer PHL1'. When the 21st light is incident on the first phase retarder layer PHL1', a delay may be provided only for the first delay axis, so that the circularly polarized light may be changed into a linearly polarized light and may be transmitted. That is, the 21st light may be light among the 21st light that has been transmitted through the first phase retarder layer PHL1', and may be a linearly polarized light.

[0165] The linear polarization direction of the 21st light may be opposite to the linear polarization direction of the 18th light. That is, since the 21st light is the light that has been transmitted through the first phase retardation layer PHL1' among the 20th light, the phase of the 20th light has been reversed by about 180 degrees by the common electrode CTE', and therefore the linear polarization direction of the 21st light may be opposite to the linear polarization direction of the 18th light. Therefore, the linear polarization direction of the 21st light may be the same as the first light absorption axis of the first absorption polarizer APOL1. Therefore, the 21st light may be absorbed by the first absorption polarizer APOL1. In other words, the 21st light may not be transmitted through the first absorption polarizer APOL1.

[0166] In an embodiment, assuming that the first absorption axis of the first absorption polarizer APOL1 is about 0 degrees, and the first phase retardation layer PHL1' provides retardation only in the 45 degree direction with respect to the retardation axis, the seventeenth light and the eighteenth light may be linearly polarized light of about 90 degrees, the nineteenth light may be right-handed circularly polarized light, the twentieth light may be left-handed circularly polarized light, and the twenty-first light may be linearly polarized light of about 0 degrees. Therefore, for example, the twenty-first light may be absorbed by the first absorption polarizer APOL1.

[0167] As a result, light reflected from the common electrode CTE' of the display panel DP' may be substantially invisible to the user UR since it is absorbed by the first absorptive polarizer APOL1 and disappears. Therefore, the occurrence of a virtual image due to reflection of the common electrode CTE' may be reduced or prevented.

[0168] In particular, since a separate polarizer is not disposed between the first phase retardation layer PHL1' and the first absorption polarizer APOL1, light reflected from the common electrode CTE' of the display panel DP' may be transmitted through the first phase retardation layer PHL1' and directly absorbed by the first absorption polarizer APOL1. Therefore, light reflected from the common electrode CTE' of the display panel DP' may disappear more easily through the first absorption polarizer APOL1.

[0169] Figure 8 is a schematic diagram showing another embodiment of a display device. Fig. 9 It is shown that the Figure 8 Schematic cross-sectional view of a display panel in a display device.

[0170] Reference Figure 8 and Fig. 9 , except that the second phase retardation layer is omitted in the display panel DP" and the first lens portion LSP1" has the second phase retardation layer PHL2", the display device DD" can be similar to the reference Figure 1 and Figure 2 The display devices DD described are substantially the same or similar, and therefore, overlapping descriptions are omitted or simplified.

[0171] The display device DD" may include a display panel DP" and an optical panel OP". The optical panel OP" may be disposed in front of the display panel DP". In an embodiment, for example, the optical panel OP" may be disposed between the display panel DP" and the user UR (eg, eyes of the user UR).

[0172] like Figure 8 As shown in FIG. 1 , the optical panel OP″ may include a first lens portion LSP1″ and a second lens portion LSP2. The description of the second lens portion LSP2 is omitted because it is similar to the reference Figure 1 In addition, in addition to including the second phase retardation layer PHL2", the first lens portion LSP1" may be the same as the reference Figure 1 The first lens portion LSP1 described is substantially the same, and therefore, an overlapping description is omitted.

[0173] The second phase retardation layer PHL2" may be disposed on the display panel DP" side of the first lens LS1. The second phase retardation layer PHL2" may be aligned with the reference Figure 2 The second phase retardation layer PHL2 is described to be substantially the same, and therefore, a detailed description is omitted.

[0174] When the first lens portion LSP1" includes the second phase retardation layer PHL2", as shown in FIG. Fig. 9 As shown in FIG. , the second phase retardation layer (refer to Figure 2The PHL2 in the display device DD" may be omitted in the display panel DP". Therefore, the display panel DP" included in the display device DD" may have a more simplified structure.

[0175] Fig.10 is a schematic diagram showing another embodiment of a display device. Fig.11 It is shown that the Fig.10 Schematic cross-sectional view of a display panel in a display device.

[0176] Reference Fig.10 and Fig.11 , except that the second phase retardation layer is omitted in the display panel DP'' and the first lens portion LSP1'' has the second phase retardation layer PHL2'', the display device DD'' can be similar to the reference Figure 5 and Figure 6 The display devices DD' described are substantially the same or similar. Therefore, overlapping descriptions are omitted or simplified.

[0177] The display device DD'' may include a display panel DP'' and an optical panel OP''. The optical panel OP'' may be disposed in front of the display panel DP''. In an embodiment, for example, the optical panel OP'' may be disposed between the display panel DP'' and the user UR (eg, eyes of the user UR).

[0178] like Fig.10 As shown in FIG. 1 , the optical panel OP'' may include a first lens portion LSP1'' and a second lens portion LSP2'. The description of the second lens portion LSP2' is omitted because it is similar to the reference Figure 5 In addition, in addition to including the second phase retardation layer PHL2'', the first lens portion LSP1'' may be the same as that of the reference Figure 5 The first lens portion LSP1' described is substantially the same. Therefore, overlapping descriptions are omitted.

[0179] The second phase retardation layer PHL2'' may be disposed on the display panel DP'' side of the first lens LS1'. The second phase retardation layer PHL2'' may be aligned with the reference Figure 6 The second phase retardation layer PHL2' is described to be substantially the same, and therefore, a detailed description is omitted.

[0180] When the first lens portion LSP1'' includes the second phase retardation layer PHL2'', as Fig.11 As shown in FIG. 1 , the second phase retardation layer can be omitted in the display panel DP″′ (refer to FIG. 1 ). Figure 6 Therefore, the display panel DP'' included in the display device DD'' may have a more simplified structure.

[0181] The display device in the embodiment may include a display panel and an optical panel disposed in front of the display panel, and the light emitted from the display panel may be bent (e.g., refracted) by a lens included in the optical panel and then reach the user UR. Therefore, the user UR may observe an image larger than the size of the display panel. Therefore, the degree to which the user UR is immersed in the image may be improved, and the three-dimensional effect of the image may also be improved.

[0182] In addition, the display panel may have a structure in which a light emitting device portion, a phase delay layer having a reverse wavelength dispersion characteristic, and an absorption polarizer are sequentially stacked. Therefore, the light reflected from the common electrode of the display panel can be absorbed by the absorption polarizer and disappear. Therefore, the light reflected from the common electrode of the display panel can be substantially invisible to the user UR. Therefore, the appearance of a virtual image due to reflection of the common electrode can be reduced or prevented.

[0183] While the invention has been particularly shown and described with reference to embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit or scope of the invention as defined by the appended claims.

Claims

1. A display device, wherein: The display device comprises: Display panel, including: A light emitting device section, comprising a light emitting device; a first phase retardation layer, disposed on the light emitting device portion and having a reverse wavelength dispersion characteristic; and an absorbing polarizer disposed on the first phase retardation layer; and An optical panel is arranged on the display panel, and the optical panel comprises: a first lens portion, disposed on the display panel and comprising a beam splitter; and The second lens portion is disposed on the first lens portion and includes a reflective polarizer.

2. The display device according to claim 1, wherein: The first phase retardation layer includes at least one of a reverse wavelength dispersion film and a reverse wavelength dispersion liquid crystal.

3. The display device according to claim 2, wherein: The reverse wavelength dispersion film included in the first phase retardation layer is a film in which a first polymer having positive birefringence and a second polymer having negative birefringence are mixed.

4. The display device according to claim 2, wherein: The reverse wavelength dispersion liquid crystal included in the first phase retardation layer is a liquid crystal in which a normal dispersion mesogen and a reverse dispersion mesogen are mixed.

5. The display device according to claim 1, wherein: The first phase retardation layer has a structure in which two or more phase retardation layers having different retardation axes are sequentially stacked.

6. The display device according to claim 1, wherein: The absorptive polarizer of the display panel has a light absorption axis, absorbs polarized light of the light absorption axis, and transmits polarized light perpendicular to the light absorption axis, and The reflective polarizer of the second lens portion has a reflection axis, reflects polarized light of the reflection axis, and transmits polarized light perpendicular to the reflection axis.

7. The display device according to claim 6, wherein: The light absorption axis and the reflection axis have the same direction as each other.

8. The display device according to claim 1, wherein: The first phase retardation layer has a first retardation axis, retards light in a direction of the first retardation axis by λ / 4, and changes linearly polarized light into circularly polarized light or changes circularly polarized light into linearly polarized light.

9. The display device according to claim 1, wherein: The display panel further includes: The second phase retardation layer, disposed on the absorbing polarizer, has a second retardation axis, retards light in the direction of the second retardation axis by λ / 4, and changes linear polarized light into circular polarized light or changes circular polarized light into linear polarized light.

10. The display device according to claim 1, wherein: The light emitting device comprises a pixel electrode, a light emitting layer disposed on the pixel electrode, and a common electrode disposed on the light emitting layer. The common electrode reflects some of the incident light, and Light reflected from the common electrode is transmitted through the first phase retardation layer and absorbed by the absorbing polarizer.

11. The display device according to claim 1, wherein: No separate polarizer is disposed between the first phase retardation layer and the absorbing polarizer.

12. A display device, wherein: The display device comprises: Display panel, including: A light emitting device section, comprising a light emitting device; A first phase retardation layer, disposed on the light emitting device portion and having a reverse wavelength dispersion characteristic; a first absorbing polarizer disposed on the first phase retardation layer; and a reflective polarizer disposed on the first absorbing polarizer; and An optical panel is arranged on the display panel, and the optical panel comprises: a first lens portion, disposed on the display panel and comprising a beam splitter; and The second lens portion is disposed on the first lens portion and includes a second absorbing polarizer.

13. The display device according to claim 12, wherein: The first phase retardation layer includes at least one of a reverse wavelength dispersion film and a reverse wavelength dispersion liquid crystal.

14. The display device according to claim 13, wherein: The reverse wavelength dispersion film included in the first phase retardation layer is a film in which a first polymer having positive birefringence and a second polymer having negative birefringence are mixed.

15. The display device according to claim 13, wherein: The reverse wavelength dispersion liquid crystal included in the first phase retardation layer is a liquid crystal in which a normal dispersion mesogen and a reverse dispersion mesogen are mixed.

16. The display device according to claim 12, wherein: The first phase retardation layer has a structure in which two or more phase retardation layers having different retardation axes are sequentially stacked.

17. The display device according to claim 12, wherein: The first absorption polarizer of the display panel has a first light absorption axis, absorbs polarized light of the first light absorption axis, and transmits polarized light perpendicular to the first light absorption axis, The reflective polarizer of the display panel has a reflection axis, reflects polarized light of the reflection axis, and transmits polarized light perpendicular to the reflection axis, and The second absorbing polarizer of the second lens portion has a second light absorption axis, absorbs polarized light of the second light absorption axis, and transmits polarized light perpendicular to the second light absorption axis.

18. The display device according to claim 17, wherein: The first light absorption axis, the reflection axis, and the second light absorption axis have the same direction as each other.

19. The display device according to claim 12, wherein: The first phase retardation layer has a first retardation axis, retards light in a direction of the first retardation axis by λ / 4, and changes linearly polarized light into circularly polarized light or changes circularly polarized light into linearly polarized light.

20. The display device according to claim 12, wherein: The display panel further includes: The second phase retardation layer, disposed on the first absorbing polarizer, has a second retardation axis, retards light in the direction of the second retardation axis by λ / 4, and changes linear polarized light into circular polarized light or changes circular polarized light into linear polarized light.

21. The display device according to claim 12, wherein: The light emitting device comprises a pixel electrode, a light emitting layer disposed on the pixel electrode, and a common electrode disposed on the light emitting layer. The common electrode reflects some of the incident light, and Light reflected from the common electrode is transmitted through the first phase retardation layer and absorbed by the first absorbing polarizer.

22. The display device according to claim 12, wherein: The light emitting device portion, the first phase retardation layer, the first absorption polarizer, and the reflective polarizer are sequentially stacked.

23. The display device according to claim 12, wherein: No separate polarizer is disposed between the first phase retardation layer and the first absorbing polarizer.

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