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 an optical panel disposed on the display panel, the optical panel including: 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. More specifically, the present disclosure relates 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 devices ("OLED"), 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 directly placed in front of the user's eyes and display images to provide a three-dimensional effect or a sense of immersion to the user have also become widely popular. Summary of the Utility Model

[0004] Embodiments provide a display device with improved display quality.

[0005] The display device in the embodiments includes: a display panel including: a light-emitting device unit including a light-emitting device; a first phase retardation layer disposed on the light-emitting device unit and having reverse wavelength dispersion characteristics; and an absorption polarizer disposed on the first phase retardation layer; and an optical panel disposed on the display panel, the optical panel including: a first lens unit disposed on the display panel and including a beam splitter; and a second lens unit disposed on the first lens unit 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; 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; or, the reverse wavelength dispersion liquid crystal included in the first phase retardation layer may be a liquid crystal in which a conventional dispersion liquid crystal element and a reverse dispersion liquid crystal element are mixed.

[0007] 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.

[0008] In an embodiment, the absorption 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 reflection polarizer of the second lens unit may have a reflection axis, reflect polarized light of the reflection axis, and transmit polarized light perpendicular to the reflection axis, wherein the light absorption axis and the reflection axis may have the same direction as each other.

[0009] In an embodiment, the first phase retardation layer may have a first retardation axis, retard light in the 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.

[0010] In an embodiment, the display panel may further include: a second phase retardation layer, disposed on the absorption polarizer, having a second retardation axis, retard light in the direction of the second retardation axis by λ / 4, and change linearly polarized light into circularly polarized light or change circularly polarized light into linearly polarized light.

[0011] 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 transmit through the first phase retardation layer and may be absorbed by the absorption polarizer.

[0012] In an embodiment, a separate polarizer may not be disposed between the first phase retardation layer and the absorption polarizer.

[0013] The display device in the embodiment includes: a display panel, including: a light-emitting device unit including a light-emitting device; a first phase retardation layer disposed on the light-emitting device unit and having reverse wavelength dispersion characteristics; a first absorption polarizer disposed on the first phase retardation layer; and a reflection polarizer disposed on the first absorption polarizer; and an optical panel disposed on the display panel, the optical panel including: a first lens unit disposed on the display panel and including a beam splitter; and a second lens unit disposed on the first lens unit and including a second absorption polarizer.

[0014] 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; 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; or, the reverse wavelength dispersion liquid crystal included in the first phase retardation layer may be a liquid crystal in which a conventional dispersion liquid crystal element and a reverse dispersion liquid crystal element are mixed.

[0015] 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.

[0016] 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 reflection 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 unit 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. Wherein, the first light absorption axis, the reflection axis, and the second light absorption axis may have the same direction as each other.

[0017] In an embodiment, the first phase retardation layer may have a first retardation axis, retard light in the 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.

[0018] In an embodiment, the display panel may further include: a second phase retardation layer disposed on the first absorption polarizer, having a second retardation axis, retard light in the direction of the second retardation axis by λ / 4, and change linearly polarized light into circularly polarized light or change circularly polarized light into linearly polarized light.

[0019] 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 pass through the first phase retardation layer and may be absorbed by the first absorption polarizer.

[0020] In an embodiment, the light-emitting device unit, the first phase retardation layer, the first absorption polarizer, and the reflection polarizer may be sequentially stacked.

[0021] In an embodiment, no separate polarizer may be provided between the first phase retardation layer and the first absorption polarizer.

[0022] The display device in the embodiment includes a display panel and an optical panel disposed on the display panel. The display panel includes: a light-emitting device portion including at least one light-emitting device; a first phase retardation layer disposed on the light-emitting device portion and having reverse wavelength dispersion characteristics; and an absorption polarizer disposed on the first phase retardation layer. 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.

[0023] 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.

[0024] 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.

[0025] In an embodiment, the reverse wavelength dispersion liquid crystal included in the first phase retardation layer may be a liquid crystal in which a conventional dispersion liquid crystal element and a reverse dispersion liquid crystal element are mixed.

[0026] 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.

[0027] In an embodiment, the absorption polarizer of the display panel may have a light absorption axis, absorb the polarized light of the light absorption axis, and transmit the polarized light perpendicular to the light absorption axis, and the reflective polarizer of the second lens portion may have a reflection axis, reflect the polarized light of the reflection axis, and transmit the polarized light perpendicular to the reflection axis.

[0028] In an embodiment, the light absorption axis and the reflection axis may have the same direction as each other.

[0029] In an embodiment, the first phase retardation layer may have a first retardation axis, delay the light in the 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.

[0030] In an embodiment, the display panel may further include: a second phase retardation layer disposed on the absorption polarizer, having a second retardation axis, delaying the light in the direction of the second retardation axis by λ / 4, and changing linearly polarized light into circularly polarized light or changing circularly polarized light into linearly polarized light.

[0031] 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 pass through the first phase retardation layer and be absorbed by the absorption polarizer.

[0032] In an embodiment, a separate polarizer may not be provided between the first phase retardation layer and the absorption polarizer.

[0033] The display device in the embodiment includes a display panel and an optical panel disposed on the display panel. The display panel includes: a light-emitting device unit including at least one light-emitting device; a first phase retardation layer disposed on the light-emitting device unit and having reverse wavelength dispersion characteristics; a first absorption polarizer disposed on the first phase retardation layer; and a reflective polarizer disposed on the first absorption polarizer; and the optical panel includes: a first lens unit disposed on the display panel and including a beam splitter; and a second lens unit disposed on the first lens unit and including a second absorption polarizer.

[0034] 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.

[0035] 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.

[0036] In an embodiment, the reverse wavelength dispersion liquid crystal included in the first phase retardation layer may be a liquid crystal in which a conventional dispersion liquid crystal element and a reverse dispersion liquid crystal element are mixed.

[0037] 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.

[0038] 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 unit 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.

[0039] 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.

[0040] In an embodiment, the first phase retardation layer may have a first retardation axis, which delays light in the direction of the first retardation axis by λ / 4, and changes linearly polarized light to circularly polarized light or changes circularly polarized light to linearly polarized light.

[0041] In an embodiment, the display panel may further include: a second phase retardation layer disposed on the first absorption polarizer, having a second retardation axis, which delays light in the direction of the second retardation axis by λ / 4, and changes linearly polarized light to circularly polarized light or changes circularly polarized light to linearly polarized light.

[0042] 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 pass through the first phase retardation layer and be absorbed by the first absorption polarizer.

[0043] In an embodiment, the light-emitting device unit, the first phase retardation layer, the first absorption polarizer, and the reflection polarizer may be sequentially stacked.

[0044] In an embodiment, no separate polarizer may be disposed between the first phase retardation layer and the first absorption polarizer.

[0045] 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. 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.

[0046] In addition, the display panel may have a structure in which a light-emitting device unit, a phase retardation layer having reverse wavelength dispersion characteristics, 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, virtual images due to reflection of the common electrode can be reduced or prevented.

[0047] It will 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 present invention as claimed. Description of the Drawings

[0048] The illustrative non - limiting embodiments will be more clearly understood from the following detailed description in conjunction with the accompanying drawings.

[0049] Figure 1 is a schematic diagram showing an embodiment of a display device.

[0050] Figure 2 is shown as including in Figure 1 a schematic cross - sectional view of a display panel in the display device.

[0051] Figure 3 is schematically shown as from Figure 1 a diagram of the path of light emitted from the display device.

[0052] Figure 4 is shown as including in Figure 1 a cross - sectional view of a display panel in the display device.

[0053] Figure 5 is a schematic diagram showing another embodiment of a display device.

[0054] Figure 6 is shown as including in Figure 5 a schematic cross - sectional view of a display panel in the display device.

[0055] Figure 7 is schematically shown as from Figure 5 a diagram of the path of light emitted from the display device.

[0056] Figure 8 is a schematic diagram showing another embodiment of a display device.

[0057] Figure 9 is shown as including in Figure 8 a schematic cross - sectional view of a display panel in the display device.

[0058] Figure 10 is a schematic diagram showing another embodiment of a display device.

[0059] Figure 11 is shown as including in Figure 10 a schematic cross - sectional view of a display panel in the display device. Detailed Description of the Embodiments

[0060] Embodiments of the present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which various embodiments are shown. However, the present utility model may be embodied in many different forms and should not be construed as 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 scope of the present utility model to those skilled in the art. Like reference numerals always refer to like elements.

[0061] It will be understood that when an element is referred to as being “on” another element, the element may be directly on the other element or there may be intervening elements 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.

[0062] 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. Thus, a first element, component, region, layer, or section discussed below may be referred to as a second element, component, region, layer, or section without departing from the teachings herein.

[0063] Unless the context clearly dictates otherwise, the terms used herein are for the purpose of describing particular embodiments only and are not intended to be limiting. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms, including “at least one.” “Or” means “and / or.” As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. It will also be understood that the terms “comprises” and / or “comprising” or “includes” and / or “including” when used in this specification specify the presence of the stated features, regions, wholes, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, regions, wholes, steps, operations, elements, components, and / or groups thereof.

[0064] 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 as shown in the figures. It will be understood that such relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the figures. For example, if the device in one of the figures is flipped, an element described as on the "lower" side of other elements will then be oriented on the "upper" side of the other elements. Depending on the specific orientation of the figures, the exemplary term "lower" may thus encompass both the "lower" and "upper" orientations. Similarly, if the device in one of the figures is flipped, an element described as "beneath" or "under" other elements will then be oriented "above" the other elements. The exemplary terms "beneath" or "under" may thus encompass both the upper and lower orientations.

[0065] Taking into account the measurements under discussion and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system), "about" or "approximate" as used herein includes the stated value and means within the acceptable deviation for a particular value as determined by a person of ordinary skill in the art. 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.

[0066] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by a person of ordinary skill in the art to which this disclosure pertains. It will also be understood that terms (such as those defined in a general dictionary) should be interpreted as having a meaning consistent with their meaning in the relevant art and the context of this disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0067] Figure 1 is a schematic diagram showing an embodiment of a display device.

[0068] Referring to 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 a user UR (e.g., the eyes of the user UR). That is, in a plane defined by a first direction D1 and a second direction D2 perpendicular to each other, the display panel DP and the optical panel OP may be sequentially aligned along a third direction D3 that is the 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.

[0069] Figure 2 is a diagram showing an example included in Figure 1Schematic cross-sectional view of a display panel in a display device.

[0070] Referring to Figure 2 , the display panel DP can be a self-emitting display panel that emits light by itself. In an embodiment, for example, the display panel DP can 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 Schematically shows a light-emitting device portion LEP included in the display panel DP. The light-emitting device portion LEP can include multiple layers of the display panel DP, in which a light-emitting device that emits light and a pixel circuit for driving the light-emitting device are formed. The common electrode CTE of the light-emitting device can be provided at the uppermost part of the light-emitting device portion LEP. Therefore, in Figure 2 , only the common electrode CTE of the light-emitting device portion LEP is shown in detail, and the detailed cross-sectional structure of the light-emitting device portion LEP will be described in more detail with reference to Figure 4 .

[0071] The first phase delay layer PHL1, the absorption polarizer APOL, and the second phase delay layer PHL2 can be sequentially provided on the light-emitting device portion LEP. In an embodiment, a separate polarizer may not be provided between the first phase delay layer PHL1 and the absorption polarizer APOL. That is, the light transmitted through the first phase delay layer PHL1 can reach the absorption polarizer APOL without passing through a separate optical structure.

[0072] The first phase delay layer PHL1 can have a first delay axis and provide a phase difference of λ / 4 with respect to the first delay axis. Therefore, the first phase delay layer PHL1 can delay the light in the direction of the first delay axis by λ / 4 to change linearly polarized light into circularly polarized light or change circularly polarized light into linearly polarized light. The first phase delay layer PHL1 can have reverse wavelength dispersion characteristics.

[0073] In an embodiment, the first phase delay layer PHL1 can include a reverse wavelength dispersion film. In an embodiment, for example, the reverse wavelength dispersion film can 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 delay layer PHL1 can be formed by blending the first polymer and the second polymer to produce an unstretched film, winding the unstretched film into a roll, and then stretching the unstretched film wound around the roll.

[0074] Embodiments of the present disclosure should not be construed as 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 concept of the present utility model to those skilled in the art.

[0075] In an embodiment, the first polymer may include a cycloolefin polymer, a polycarbonate (“PC”), a polyethylene terephthalate (“PET”), or a cellulose-based polymer, etc. These may be used alone or in any combination with each other.

[0076] In an embodiment, the second polymer may include polystyrene, a polyacrylate, a polycarbonate, or an acrylate-styrene copolymer, etc. These may be used alone or in any combination with each other.

[0077] In an embodiment, the first phase retardation layer PHL1 may include a reverse wavelength dispersion liquid crystal. In an embodiment, for example, the reverse wavelength dispersion liquid crystal may be a liquid crystal in which a conventional dispersion liquid crystal mesogen and a reverse dispersion liquid crystal mesogen are mixed.

[0078] 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.

[0079] In another embodiment, the first phase retardation layer PHL1 may have a multi-layer 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.

[0080] Since the first phase retardation layer PHL1 may have reverse wavelength dispersion characteristics (regardless of the wavelength band of the light emitted from the light emitting device unit 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 serve as a phase retardation layer for light in various wavelength bands.

[0081] The absorption polarizer APOL may have a light absorption axis (absorption axis). The absorption polarizer APOL may absorb linearly polarized light in the same direction as the absorption axis (i.e., the polarized light of the light absorption axis). That is, linearly 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 linearly polarized light perpendicular to the absorption axis. That is, the absorption polarizer APOL may have a transmission axis perpendicular to the light absorption axis.

[0082] The second phase retardation layer PHL2 may have a second retardation axis and provide a phase difference of λ / 4 with respect to the second retardation axis. Thus, the second phase retardation layer PHL2 may retard light in the direction of the second retardation axis by λ / 4 to change linearly polarized light to circularly polarized light or change circularly polarized light to linearly polarized light.

[0083] Return 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.

[0084] The first lens LS1 and the second lens LS2 may be curved lenses. The curved surfaces of each of the first lens LS1 and the second lens LS2 may be spherical or aspherical. In Figure 1 , the opposite sides of the first lens LS1 are shown as convex, but the shape of the first lens LS1 need not be 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.

[0085] 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 utility model need not be limited thereto, and the beam splitter BSP may be disposed on the display panel DP side of the first lens LS1.

[0086] The beam splitter BSP may transmit some of the incident light and reflect some of the incident light. The beam splitter BSP may reflect and transmit light regardless of the polarization characteristics of the light.

[0087] 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. Thus, the third phase retardation layer PHL3 may retard light in the direction of the third retardation axis by λ / 4 to change linearly polarized light to circularly polarized light or change circularly polarized light to linearly polarized light.

[0088] The reflective polarizer RPOL can be disposed on the other side of the second lens LS2. In an embodiment, for example, the reflective polarizer RPOL can be disposed on the user UR side of the second lens LS2. The reflective polarizer RPOL can have a reflection axis. The reflective polarizer RPOL can reflect linearly polarized light in the same direction as the reflection axis. That is, linearly polarized light in the same direction as the reflection axis can not be transmitted through the reflective polarizer RPOL. In addition, the reflective polarizer RPOL can transmit linearly polarized light perpendicular to the reflection axis. That is, the reflective polarizer RPOL can have a transmission axis perpendicular to the reflection axis.

[0089] In an embodiment, the light absorption axis of the absorption polarizer APOL and the reflection axis of the reflective polarizer RPOL can have the same direction with respect to each other.

[0090] Figure 3 is a diagram schematically showing the path of light emitted from Figure 1 the display device.

[0091] Hereinafter, with reference to Figure 3 , the path through which light emitted from the display panel DP of the display device DD (refer to Figure 1 ) reaches the user UR via the optical panel OP will be described in more detail.

[0092] In Figure 3 , for ease of explanation, each layer is shown as having a flat structure, but in an actual structure, the components of the optical panel OP can have a curved surface corresponding to Figure 1 .

[0093] In addition, in Figure 3 , for ease of explanation, only the common electrode CTE of the light emitting device portion LEP is shown in detail. The detailed cross-sectional structure of the light emitting device portion LEP will be described in more detail later with reference to Figure 4 .

[0094] Further referring to Figure 1 and Figure 3 , the light emitted from the display panel DP can be transmitted through the first lens portion LSP1 and the second lens portion LSP2 respectively and provided to the user UR. The light emitted from the display panel DP can be bent (e.g., refracted) by the first lens LS1 and the second lens LS2 and then reach the user UR. Thus, the user UR can 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 can be improved, and the three-dimensional effect of the image can also be improved.

[0095] The common electrode CTE of the light-emitting device portion LEP may have a semi-transmissive and reflective property. That is to say, the common electrode CTE may reflect some of the incident light. In an embodiment, for example, the common electrode CTE may reflect approximately 50% of the incident light. However, the present utility model is not necessarily limited thereto, and the reflectivity of the common electrode CTE may vary according to the embodiment.

[0096] 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 approximately 45 degrees with respect to the light absorption axis of the absorption polarizer APOL.

[0097] In Figure 3 each beam of light is assigned a number, and the characteristics of the light are described according to the order of the numbers.

[0098] First, referring to the first light (refer to the first light 1 in Figure 3 ), the light emitted from the common electrode CTE of the light-emitting device portion LEP in the third direction D3 may have polarization characteristics in all directions.

[0099] Referring to the second light (refer to the second light 2 in Figure 3 ), the first light may transmit 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 with respect to the first retardation axis, the second light also has polarization characteristics in all directions.

[0100] Referring to the third light (refer to the third light 3 in Figure 3 ), the second light may be incident on the absorption polarizer APOL. Among the second light, the linearly polarized light in the same direction as the absorption axis of the absorption polarizer APOL may be absorbed by the absorption polarizer APOL, and the linearly polarized light perpendicular to the absorption axis may transmit through the absorption polarizer APOL. That is to say, the third light may be the light that has transmitted through the absorption polarizer APOL among the second light, and may be linearly polarized light perpendicular to the absorption axis.

[0101] Referring to the fourth light (refer to the fourth light 4 in Figure 3 ), the third light may be incident on the second phase retardation layer PHL2. When the third light is incident on the second phase retardation layer PHL2, a delay may be provided only for the second retardation axis, so that the linearly polarized light is changed to circularly polarized light and may be transmitted. That is to say, the fourth light may be the light that has transmitted through the second phase retardation layer PHL2 among the third light, and may be circularly polarized light.

[0102] Referring to the fifth light (refer to the fifth light in Figure 3the fifth light 5) and the sixth light (refer to Figure 3 the sixth light 6) in, the fourth light can be incident on the beam splitter BSP. When the fourth light is incident on the beam splitter BSP, some of the fourth light can transmit through the beam splitter BSP, and some of the fourth light can be reflected from the beam splitter BSP. Among the fourth light, the light that transmits through the beam splitter BSP is also called the fifth light, and the light that is reflected from the beam splitter BSP is also called the sixth light. At this time, the phase of the light that transmits through the beam splitter BSP does not change, and the phase of the light that is reflected from the beam splitter BSP can be halved by approximately 180 degrees. That is to say, the fifth light can be circularly polarized light in the same direction as the fourth light, and the sixth light can be circularly polarized light in the opposite direction to the fourth light.

[0103] Refer to the seventh light (refer to Figure 3 the seventh light 7) in, the sixth light can be incident on the second phase retardation layer PHL2. When the sixth light is incident on the second phase retardation layer PHL2, a retardation can be provided only for the second retardation axis, so that the circularly polarized light is changed to linearly polarized light and can be transmitted. That is to say, the seventh light can be the light that has transmitted through the second phase retardation layer PHL2 among the sixth light, and can be linearly polarized light.

[0104] The linear polarization direction of the seventh light can be opposite to the linear polarization direction of the third light. That is to say, since the seventh light is the light that has transmitted through the second phase retardation layer PHL2 among the sixth light, and the phase of the sixth light has been reversed by approximately 180 degrees by the beam splitter BSP, the linear polarization direction of the seventh light can be opposite to the linear polarization direction of the third light. Therefore, the linear polarization direction of the seventh light can be the same as the light absorption axis of the absorption polarizer APOL. Therefore, the seventh light can be absorbed by the absorption polarizer APOL. In other words, the seventh light cannot transmit through the absorption polarizer APOL.

[0105] As a result, among the light incident on the beam splitter BSP from the display panel DP, since it is absorbed by the absorption polarizer APOL and disappears, the light reflected from the beam splitter BSP can be invisible to the user UR.

[0106] In an embodiment, for example, it is assumed that the absorption axis of the absorption polarizer APOL is approximately 0 degrees, and the second phase retardation layer PHL2 provides a retardation only in the 45-degree direction for the retardation axis. The third light can be linearly polarized light of approximately 90 degrees, the fourth light can be left-circularly polarized light, the sixth light can be right-circularly polarized light, and the seventh light can be linearly polarized light of approximately 0 degrees. Therefore, the seventh light can be absorbed by the absorption polarizer APOL.

[0107] Referring to the eighth light (refer to Figure 3 the eighth light 8 in), the fifth light can be incident on the third phase retardation layer PHL3. When the fifth light is incident on the third phase retardation layer PHL3, retardation can be provided only for the third retardation axis, so that circularly polarized light can be changed to linearly polarized light and can be transmitted. That is to say, the eighth light can be the light among the fifth lights that has transmitted through the third phase retardation layer PHL3, and can be linearly polarized light.

[0108] Referring to the ninth light (refer to Figure 3 the ninth light 9 in), the eighth light can be incident on the reflective polarizer RPOL. Among the eighth lights, the linearly polarized light in the same direction as the reflection axis of the reflective polarizer RPOL can be reflected from the reflective polarizer RPOL, and the linearly polarized light perpendicular to the reflection axis can be transmitted through the reflective polarizer RPOL. That is to say, the ninth light can be the light among the eighth lights that is reflected from the reflective polarizer RPOL, and can be linearly polarized light in the same direction as the reflection axis.

[0109] In an embodiment, for example, assuming that the absorption axis of the absorption polarizer APOL is about 0 degrees, the third phase retardation layer PHL3 provides retardation only for the retardation axis in the 45-degree direction, and the reflection axis of the reflective polarizer RPOL is about 0 degrees, the third light can be linearly polarized light of about 90 degrees, 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 linearly polarized light of about 0 degrees, and the ninth light can be linearly polarized light of about 0 degrees.

[0110] Referring to the tenth light (refer to Figure 3 the tenth light 10 in), the ninth light can be incident on the third phase retardation layer PHL3. When the ninth light is incident on the third phase retardation layer PHL3, retardation can be provided only for the third retardation axis, so that linearly polarized light can be changed to circularly polarized light and can be transmitted. That is to say, the tenth light can be the light among the ninth lights that has transmitted through the third phase retardation layer PHL3, and can be circularly polarized light.

[0111] Referring to the eleventh light (refer to Figure 3 the eleventh light 11 in) and the twelfth light (refer to Figure 3Among the tenth light 12), the tenth light can be incident on the beam splitter BSP. When the tenth light is incident on the beam splitter BSP, some of the tenth light can be transmitted through the beam splitter BSP, and some of the tenth light can 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 can be halved by approximately 180 degrees. That is to say, the eleventh light can be circularly polarized light in the same direction as the tenth light, and the twelfth light can be circularly polarized light in the opposite direction to the tenth light.

[0112] Referring to the thirteenth light (refer to Figure 3 Among the thirteenth light 13), the twelfth light can be incident on the third phase retardation layer PHL3. When the twelfth light is incident on the third phase retardation layer PHL3, a retardation can be provided only for the third retardation axis, so that the circularly polarized light can be changed into linearly polarized light and can be transmitted. That is to say, the thirteenth light can be the light among the twelfth light that has been transmitted through the third phase retardation layer PHL3, and can be linearly polarized light.

[0113] At this time, the linear polarization direction of the thirteenth light can be opposite to the linear polarization direction of the eighth light. That is to say, since the thirteenth light is the light among the twelfth light that has been transmitted through the third phase retardation layer PHL3, and the phase of the twelfth light has been reversed by approximately 180 degrees by the beam splitter BSP, the linear polarization direction of the thirteenth light can be opposite to the linear polarization direction of the eighth light. Therefore, the linear polarization direction of the thirteenth light can be perpendicular to the reflection axis of the reflection polarizer RPOL. In other words, the linear polarization direction of the thirteenth light can be the same as the transmission axis of the reflection polarizer RPOL. Therefore, the thirteenth light can be transmitted through the reflection polarizer RPOL.

[0114] In an embodiment, for example, assume that the third phase retardation layer PHL3 provides retardation only in the 45-degree direction for the retardation axis, and the reflection axis of the reflection polarizer RPOL is approximately 0 degrees. The eighth light and the ninth light can be linearly polarized light of approximately 0 degrees, the eleventh light can be left-handed circularly polarized light, the twelfth light can be right-handed circularly polarized light, and the thirteenth light can be linearly polarized light of approximately 90 degrees. Therefore, the thirteenth light can be transmitted through the reflection polarizer RPOL.

[0115] Referring to the fourteenth light (refer to Figure 3 Among the fourteenth light 14), the fourteenth light can be the light among the thirteenth light that has been transmitted through the reflection polarizer RPOL, and can be linearly polarized light in the direction perpendicular to the reflection axis. The fourteenth light can be provided to the user UR.

[0116] Referring to the fifteenth light (refer to Figure 3 the fifteenth light 15 in ), the eleventh light can be incident on the second phase retardation layer PHL2. When the eleventh light is incident on the second phase retardation layer PHL2, retardation can be provided only for the second retardation axis, such that circularly polarized light can be changed to linearly polarized light and can be transmitted. That is to say, the fifteenth light can be the light among the eleventh lights that has transmitted through the second phase retardation layer PHL2, and can be linearly polarized light.

[0117] Referring to the sixteenth light (refer to Figure 3 the sixteenth light 16 in ), the fifteenth light can be incident on the absorption polarizer APOL. Among the fifteenth lights, the linearly polarized light in the same direction as the absorption axis of the absorption polarizer APOL can be absorbed by the absorption polarizer APOL, and the linearly polarized light perpendicular to the absorption axis can transmit through the absorption polarizer APOL. That is to say, the sixteenth light can be the light among the fifteenth lights that has transmitted through the absorption polarizer APOL, and can be linearly polarized light perpendicular to the absorption axis.

[0118] Referring to the seventeenth light (refer to Figure 3 the seventeenth light 17 in ), the sixteenth light can be incident on the first phase retardation layer PHL1. When the sixteenth light is incident on the first phase retardation layer PHL1, retardation can be provided only for the first retardation axis, such that linearly polarized light can be changed to circularly polarized light and can be transmitted. That is to say, the seventeenth light can be the light among the sixteenth lights that has transmitted through the first phase retardation layer PHL1, and can be circularly polarized light.

[0119] Referring to the eighteenth light (refer to Figure 3 the eighteenth light 18 in ), the seventeenth light can be incident on the common electrode CTE. The common electrode CTE can reflect the seventeenth light. That is to say, the eighteenth light can be the light obtained when the seventeenth light is reflected by the common electrode CTE. At this time, the phase of the light can be reversed by approximately 180 degrees. Therefore, the eighteenth light can be circularly polarized light in the opposite direction to the seventeenth light.

[0120] Referring to the nineteenth light (refer to Figure 3 the nineteenth light 19 in ), the eighteenth light can be incident on the first phase retardation layer PHL1. When the eighteenth light is incident on the first phase retardation layer PHL1, retardation can be provided only for the first retardation axis, such that circularly polarized light can be changed to linearly polarized light and can be transmitted. That is to say, the nineteenth light can be the light among the eighteenth lights that has transmitted through the first phase retardation layer PHL1, and can be linearly polarized light.

[0121] At this time, the linear polarization direction of the nineteenth light can be opposite to that of the sixteenth light. That is to say, since the nineteenth light is the light among the eighteenth lights that has transmitted through the first phase retardation layer PHL1, the phase of the eighteenth light has been inverted by approximately 180 degrees by the common electrode CTE. Therefore, the linear polarization direction of the nineteenth light can be opposite to that of the sixteenth light. Thus, the linear polarization direction of the nineteenth light can be the same as the light absorption axis of the absorption polarizer APOL. Therefore, the nineteenth light can be absorbed by the absorption polarizer APOL. In other words, the nineteenth light cannot transmit through the absorption polarizer APOL.

[0122] In an embodiment, for example, it is assumed that the absorption axis of the absorption polarizer APOL is approximately 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 can be left-handed circularly polarized light, the fifteenth and sixteenth lights can be linearly polarized lights of approximately 90 degrees, the eighteenth light can be left-handed circularly polarized light, and the nineteenth light can be linearly polarized light of approximately 0 degrees. Therefore, the nineteenth light can be absorbed by the absorption polarizer APOL.

[0123] As a result, the light reflected from the common electrode CTE of the display panel DP is absorbed and disappears due to being absorbed by the absorption polarizer APOL, and thus can be substantially invisible to the user UR. Therefore, virtual images caused by the reflection of the common electrode CTE can be reduced or prevented.

[0124] In particular, since no separate polarizer is 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 can transmit through the first phase retardation layer PHL1 and be directly absorbed by the absorption polarizer APOL. Therefore, the light reflected from the common electrode CTE of the display panel DP can more easily disappear through the absorption polarizer APOL.

[0125] Figure 4 is a cross-sectional view showing a display panel included in Figure 1 the display device.

[0126] Hereinafter, with reference to Figure 4 , the cross-sectional structure of the display panel DP (refer to Figure 1 ) will be described in more detail.

[0127] With reference to 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, a packaging layer ENC, a first phase retardation layer PHL1, an absorption polarizer APOL, and a second phase retardation layer PHL2. Here, the light-emitting device LED may include a pixel electrode ADE, a light-emitting layer EML, and a common electrode CTE.

[0128] In an embodiment, the display panel DP may be an ultra-small light-emitting diode display panel (or micro light-emitting diode display panel) including an ultra-small light-emitting diode (or micro light-emitting diode) as the light-emitting diode. However, the present utility model is not necessarily limited thereto.

[0129] 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 a pixel circuit portion PXC is disposed on a silicon wafer. That is, the silicon wafer may be a support member for supporting components of the display panel DP. The pixel circuit portion PXC may include at least one transistor.

[0130] The insulating layer IL may be disposed on the driving substrate DSUB. In an embodiment, the insulating layer IL may define contact holes 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 acid resin, a polyimide resin, or an acrylic resin, etc. These may be used alone or in any combination with each other.

[0131] The pixel connection pattern CP may be filled in the contact holes. 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).

[0132] 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 act as an anode.

[0133] 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 part of the pixel electrode ADE.

[0134] 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 utility model is not necessarily limited thereto.

[0135] The common electrode CTE can be disposed on the light-emitting layer EML and the pixel definition layer PDL. The common electrode CTE can include a conductive material. In an embodiment, the conductive material used as the common electrode CTE can include lithium, calcium, aluminum, silver, or magnesium, etc. These can be used alone or in any combination with each other. In an embodiment, for example, the common electrode CTE can act as a cathode.

[0136] Figure 4 The structure of the display panel DP shown in is an example and can be changed in various ways according to embodiments.

[0137] Figure 5 is a schematic diagram showing another embodiment of the display device. Figure 6 is shown in Figure 5 is a schematic cross-sectional view of the display panel included in the display device.

[0138] Referring to Figure 5 and Figure 6 , except that the display panel DP' further includes a reflective polarizer RPOL', and the second lens unit LSP2' includes an absorption polarizer (e.g., the second absorption polarizer APOL2), the display device DD' can be substantially the same or similar to the display device DD of Figure 1 and Figure 2 . Therefore, the overlapping descriptions are omitted or simplified.

[0139] The display device DD' can include a display panel DP' and an optical panel OP'. The optical panel OP' can be disposed in front of the display panel DP'. In an embodiment, for example, the optical panel OP' can be disposed between the display panel DP' and the user UR (e.g., the eyes of the user UR).

[0140] Figure 6 Schematically shows the light-emitting device unit LEP' included in the display panel DP'. The light-emitting device unit LEP' can include multiple layers of the display panel DP', in which a light-emitting device that emits light and a pixel circuit for driving the light-emitting device are formed. The common electrode CTE' of the light-emitting device can be disposed at the uppermost part of the light-emitting device unit LEP'. The detailed cross-sectional structure can be substantially the same as the cross-sectional structure of the light-emitting device unit LEP described with reference to Figure 4 . Therefore, the detailed description is omitted.

[0141] The first phase retardation layer PHL1', the first absorption polarizer APOL1, the reflective polarizer RPOL', and the second phase retardation layer PHL2' can be sequentially disposed on the light-emitting device portion LEP'. In an embodiment, no separate polarizer may be disposed between the first phase retardation layer PHL1' and the first absorption polarizer APOL1. That is, the light transmitted through the first phase retardation layer PHL1' can reach the first absorption polarizer APOL1 without passing through a separate optical structure.

[0142] The first phase retardation layer PHL1' can be substantially the same as the first phase retardation layer PHL1 described with reference to Figure 2 the reflective polarizer RPOL' can be substantially the same as the reflective polarizer RPOL described with reference to Figure 1 and the second phase retardation layer PHL2' can be substantially the same as the second phase retardation layer PHL2 described with reference to Figure 2 Accordingly, detailed descriptions are omitted.

[0143] That is, the first phase retardation layer PHL1' can have a first retardation axis, the reflective polarizer RPOL' can have a reflection axis, and the second phase retardation layer PHL2' can have a second retardation axis.

[0144] The first absorption polarizer APOL1 can have a first light absorption axis (first absorption axis). The first absorption polarizer APOL1 can absorb linearly polarized light in the same direction as the first absorption axis. That is, linearly polarized light in the same direction as the first absorption axis cannot be transmitted through the first absorption polarizer APOL1. In addition, the first absorption polarizer APOL1 can transmit linearly polarized light perpendicular to the first absorption axis. That is, the first absorption polarizer APOL1 can have a transmission axis perpendicular to the first absorption axis.

[0145] As Figure 5 shown, the optical panel OP' can include a first lens portion LSP1' and a second lens portion LSP2'. The first lens portion LSP1' can be substantially the same as the first lens portion LSP1 described with reference to Figure 1 That is, the first lens LS1' of the first lens portion LSP1' can be substantially the same as the first lens LS1 of Figure 1 and the beam splitter BSP' can be substantially the same as the beam splitter BSP of Figure 1 Accordingly, detailed descriptions are omitted.

[0146] The second lens portion LSP2' can include a second lens LS2', a third phase retardation layer PHL3', and a second absorption polarizer APOL2. The second lens LS2' can be substantially the same as the second lens LS2 described with reference to Figure 1The second lens LS2 described is substantially the same, and the third phase retardation layer PHL3' can be substantially the same as the third phase retardation layer PHL3 described in the reference. Therefore, the overlapping description is omitted. Figure 1 The third phase retardation layer PHL3 described in the reference. Therefore, the overlapping description is omitted.

[0147] The second absorption polarizer APOL2 can be disposed on the user UR side of the second lens LS2'. The second absorption polarizer APOL2 can have a second light absorption axis (second absorption axis). The second absorption polarizer APOL2 can absorb linearly polarized light in the same direction as the second absorption axis. That is, linearly polarized light in the same direction as the second absorption axis cannot pass through the second absorption polarizer APOL2. In addition, the second absorption polarizer APOL2 can transmit linearly polarized light perpendicular to the second absorption axis. That is, the second absorption polarizer APOL2 can have a transmission axis perpendicular to the second light absorption axis.

[0148] In an embodiment, the first light absorption axis of the first absorption polarizer APOL1, the reflection axis of the reflection polarizer RPOL', and the second light absorption axis of the second absorption polarizer APOL2 can have the same direction as each other.

[0149] Figure 7 is a diagram schematically showing the path of light emitted from Figure 5 the display device.

[0150] Hereinafter, with reference to Figure 7 , the path through which light emitted from the display panel DP' of the display device DD' (refer to Figure 5 ) reaches the user UR via the optical panel OP' will be described in more detail.

[0151] In Figure 7 , for ease of explanation, each layer is shown as having a flat structure, but in an actual structure, the components of the optical panel OP' can have a curved surface corresponding to Figure 5 .

[0152] In addition, in Figure 7 , for ease of explanation, only the common electrode CTE' of the light emitting device unit LEP' is shown in detail.

[0153] Further referring to Figure 5 and Figure 7Light emitted from the display panel DP' can pass through the first lens unit LSP1' and the second lens unit LSP2' respectively, and be provided to the user UR. The light emitted from the display panel DP' can 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 can observe an image larger than the size of the display panel DP'. Thus, the degree to which the user UR is immersed in the image can be improved, and the three-dimensional effect of the image can also be improved.

[0154] The common electrode CTE' of the light-emitting device unit LEP' can have a semi-transmissive and reflective characteristic. That is, the common electrode CTE' can reflect some of the incident light. In an embodiment, for example, the common electrode CTE' can reflect about 50% of the incident light. However, the present utility model is not limited thereto, and the reflectivity of the common electrode CTE' can vary according to the embodiment.

[0155] The first phase retardation layer PHL1', the first absorption polarizer APOL1, the reflective polarizer RPOL', and the second phase retardation layer PHL2' can be sequentially disposed on the common electrode CTE' along the third direction D3. In an embodiment, the first phase retardation layer PHL1' can be disposed at about 45 degrees with respect to the first light absorption axis of the first absorption polarizer APOL1.

[0156] In Figure 7 each beam of light is assigned a number, and the characteristics of the light are described according to the order of the numbers.

[0157] First, referring to the first light (refer to Figure 7 the first light 1 therein), the light emitted from the common electrode CTE' of the light-emitting device unit LEP' in the third direction D3 can have polarization characteristics in all directions.

[0158] Referring to the second light (refer to Figure 7 the second light 2 therein), the first light can pass 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 with respect to the first retardation axis, the second light also has polarization characteristics in all directions.

[0159] Referring to the third light (refer to Figure 7In the third light 3), the second light can be incident on the first absorption polarizer APOL1. Among the second light, the linearly polarized light in the same direction as the first absorption axis of the first absorption polarizer APOL1 can be absorbed by the first absorption polarizer APOL1, and the linearly polarized light perpendicular to the first absorption axis can be transmitted through the first absorption polarizer APOL1. That is to say, the third light can be the light among the second light that has been transmitted through the first absorption polarizer APOL1, and can be the linearly polarized light perpendicular to the first absorption axis.

[0160] Referring to the fourth light (refer to Figure 7 In the fourth light 4), the third light can be incident on the reflection polarizer RPOL'. Among the third light, the linearly polarized light in the same direction as the reflection axis of the reflection polarizer RPOL' can be reflected from the reflection polarizer RPOL', and the linearly polarized light perpendicular to the reflection axis can be transmitted through the reflection polarizer RPOL'. That is to say, the fourth light can be the light among the third light that has been transmitted through the reflection polarizer RPOL', and can be the linearly polarized light perpendicular to the reflection axis.

[0161] Referring to the fifth light (refer to Figure 7 In the fifth light 5), the fourth light can be incident on the second phase retardation layer PHL2'. When the fourth light is incident on the second phase retardation layer PHL2', a delay can be provided only for the second retardation axis, so that the linearly polarized light is changed into circularly polarized light and can be transmitted. That is to say, the fifth light can be the light among the fourth light that has been transmitted through the second phase retardation layer PHL2', and can be circularly polarized light.

[0162] Referring to the sixth light (refer to Figure 7 In the sixth light 6) and the seventh light (refer to Figure 7 In the seventh light 7), the fifth light can be incident on the beam splitter BSP'. When the fifth light is incident on the beam splitter BSP', some of the fifth light can be transmitted through the beam splitter BSP', and some of the fifth light can be reflected from the beam splitter BSP'. Among the fifth light, the light transmitted through the beam splitter BSP' is also called the sixth light, and the light reflected from the beam splitter BSP' is also called 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' can be halved by approximately 180 degrees. That is to say, the sixth light can be circularly polarized light in the same direction as the fifth light, and the seventh light can be circularly polarized light in the opposite direction to the fifth light.

[0163] Referring to the eighth light (refer to Figure 7Among the eighth light 8), the sixth light can be incident on the third phase retardation layer PHL3'. When the sixth light is incident on the third phase retardation layer PHL3', a retardation can be provided only for the third retardation axis, such that the circularly polarized light is changed to linearly polarized light and can be transmitted. That is to say, the eighth light can be the light among the sixth light that has transmitted through the third phase retardation layer PHL3', and can be linearly polarized light.

[0164] At this time, the linear polarization direction of the eighth light can be opposite to the linear polarization direction of the third light. That is to say, since the eighth light is the light obtained by sequentially transmitting through the reflective polarizer RPOL', the second phase retardation layer PHL2', the beam splitter BSP', and the third phase retardation layer PHL3' following the third light, the linear polarization direction of the eighth light can be opposite to the linear polarization direction of the third light. Therefore, the linear polarization direction of the eighth light can be the same as the light absorption axis of the second absorption polarizer APOL2. Therefore, the eighth light can be absorbed by the second absorption polarizer APOL2. In other words, the eighth light may not transmit through the second absorption polarizer APOL2.

[0165] In an embodiment, for example, it is assumed that the first absorption axis of the first absorption polarizer APOL1, the reflection axis of the reflective polarizer RPOL', and the second absorption axis of the second absorption polarizer APOL2 are approximately 0 degrees, and each of the second phase retardation layer PHL2' and the third phase retardation layer PHL3' provides a retardation only in the 45-degree direction for the retardation axis. The third light and the fourth light can be linearly polarized light of approximately 90 degrees, the fifth light and the sixth light can be left-handed circularly polarized light, and the eighth light can be linearly polarized light of approximately 0 degrees. Therefore, the eighth light may not transmit through the second absorption polarizer APOL2.

[0166] Referring to the ninth light (refer to Figure 7 Among the ninth light 9), the seventh light can be incident on the second phase retardation layer PHL2'. When the seventh light is incident on the second phase retardation layer PHL2', a retardation can be provided only for the second retardation axis, such that the circularly polarized light is changed to linearly polarized light and can be transmitted. That is to say, the ninth light can be the light among the seventh light that has transmitted through the second phase retardation layer PHL2', and can be linearly polarized light.

[0167] Referring to the tenth light (refer to Figure 7Among the ninth light 10), the ninth light can be incident on the reflective polarizer RPOL'. Among the ninth light, linearly polarized light in the same direction as the reflection axis of the reflective polarizer RPOL' can be reflected from the reflective polarizer RPOL', and linearly polarized light perpendicular to the reflection axis can be transmitted through the reflective polarizer RPOL'. That is to say, the tenth light can be the light reflected from the reflective polarizer RPOL' among the ninth light, and can be linearly polarized light in the same direction as the reflection axis.

[0168] In an embodiment, for example, assume 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 retardation layer PHL2' provides retardation only in the 45-degree direction for the retardation axis. The third light and the fourth light can be linearly polarized light of approximately 90 degrees, the fifth light and the sixth light can be left-handed circularly polarized light, 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.

[0169] Referring to the eleventh light (refer to Figure 7 Among the eleventh light 11), the tenth light can be incident on the second phase retardation layer PHL2'. When the tenth light is incident on the second phase retardation layer PHL2', retardation can be provided only for the second retardation axis, so that the linearly polarized light is changed to circularly polarized light and can be transmitted. That is to say, the eleventh light can be the light that has transmitted through the second phase retardation layer PHL2' among the tenth light, and can be circularly polarized light.

[0170] Referring to the twelfth light (refer to Figure 7 Among the twelfth light 12) and the thirteenth light (refer to Figure 7 Among the thirteenth light 13), the eleventh light can be incident on the beam splitter BSP'. When the eleventh light is incident on the beam splitter BSP', some of the eleventh light can be transmitted through the beam splitter BSP', and some of the eleventh light can be reflected from the beam splitter BSP'. Among the eleventh light, the light transmitted through the beam splitter BSP' is also called the twelfth light, and the light reflected from the beam splitter BSP' is also called 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' can be halved by approximately 180 degrees. That is to say, the twelfth light can be circularly polarized light in the same direction as the eleventh light, and the thirteenth light can be circularly polarized light in the opposite direction to the eleventh light.

[0171] Referring to the fourteenth light (refer to Figure 7Among the fourteenth light (14), the twelfth light can be incident on the third phase retardation layer PHL3'. When the twelfth light is incident on the third phase retardation layer PHL3', a retardation can be provided only for the third retardation axis, such that circularly polarized light can be changed to linearly polarized light and can be transmitted. That is to say, the fourteenth light can be the light among the twelfth light that has transmitted through the third phase retardation layer PHL3', and can be linearly polarized light.

[0172] At this time, the linear polarization direction of the fourteenth light can be opposite to the linear polarization direction of the eighth light. Therefore, the linear polarization direction of the fourteenth light can be perpendicular to the second absorption axis of the second absorption polarizer APOL2. In other words, the linear polarization direction of the fourteenth light can be the same as the transmission axis of the second absorption polarizer APOL2. Therefore, the fourteenth light can transmit through the second absorption polarizer APOL2.

[0173] In an embodiment, assuming that the second absorption axis of the second absorption polarizer APOL2 is about 0 degrees, the eighth light can be linearly polarized light of about 0 degrees, and the fourteenth light can be left-handed circularly polarized light. Therefore, for example, the fourteenth light can transmit through the second absorption polarizer APOL2.

[0174] Referring to the fifteenth light (refer to Figure 7 the fifteenth light 15 in), the fifteenth light can be the light among the fourteenth light that has transmitted through the second absorption polarizer APOL2, and can be linearly polarized light in a direction perpendicular to the second absorption axis. The fifteenth light can be provided to the user UR.

[0175] Referring to the sixteenth light (refer to Figure 7 the sixteenth light 16 in), the thirteenth light can be incident on the second phase retardation layer PHL2'. When the thirteenth light is incident on the second phase retardation layer PHL2', a retardation can be provided only for the second retardation axis, such that circularly polarized light can be changed to linearly polarized light and can be transmitted. That is to say, the sixteenth light can be the light among the thirteenth light that has transmitted through the second phase retardation layer PHL2', and can be linearly polarized light.

[0176] Referring to the seventeenth light (refer to Figure 7 the seventeenth light 17 in), the sixteenth light can be incident on the reflective polarizer RPOL'. Among the sixteenth light, linearly polarized light in the same direction as the reflection axis of the reflective polarizer RPOL' can be reflected from the reflective polarizer RPOL', and linearly polarized light perpendicular to the reflection axis can transmit through the reflective polarizer RPOL'. That is to say, the seventeenth light can be the light among the sixteenth light that has transmitted through the reflective polarizer RPOL', and can be linearly polarized light perpendicular to the reflection axis.

[0177] Referring to the eighteenth light (refer to Figure 7 the eighteenth light 18 in), the seventeenth light can be incident on the first absorption polarizer APOL1. Among the seventeenth light, the linearly polarized light in the same direction as the first absorption axis of the first absorption polarizer APOL1 can be absorbed by the first absorption polarizer APOL1, and the linearly polarized light perpendicular to the first absorption axis can be transmitted through the first absorption polarizer APOL1. That is to say, the eighteenth light can be the light among the seventeenth light that has been transmitted through the first absorption polarizer APOL1, and can be linearly polarized light perpendicular to the first absorption axis.

[0178] In an embodiment, for example, assuming that the reflection axis of the reflection polarizer RPOL' and the first absorption axis of the first absorption polarizer APOL1 are approximately 0 degrees, the sixteenth light and the seventeenth light can be linearly polarized light of approximately 90 degrees. Therefore, the sixteenth light can be transmitted through the reflection polarizer RPOL', and the seventeenth light can be transmitted through the first absorption polarizer APOL1. Therefore, the eighteenth light can be linearly polarized light of approximately 90 degrees.

[0179] Referring to the nineteenth light (refer to Figure 7 the nineteenth light 19 in), the eighteenth light can be incident on the first phase retardation layer PHL1'. When the eighteenth light is incident on the first phase retardation layer PHL1', a retardation can be provided only for the first retardation axis, so that the linearly polarized light can be changed into circularly polarized light and can be transmitted. That is to say, the nineteenth light can be the light among the eighteenth light that has been transmitted through the first phase retardation layer PHL1', and can be circularly polarized light.

[0180] Referring to the twentieth light (refer to Figure 7 the twentieth light 20 in), the nineteenth light can be incident on the common electrode CTE'. The common electrode CTE' can reflect the nineteenth light. That is to say, the twentieth light can be the light obtained when the nineteenth light is reflected by the common electrode CTE'. At this time, the phase of the light can be reversed by approximately 180 degrees. Therefore, the twentieth light can be circularly polarized light in the opposite direction to the nineteenth light.

[0181] Referring to the twenty-first light (refer to Figure 7 the twenty-first light 21 in), the twentieth light can be incident on the first phase retardation layer PHL1'. When the twentieth light is incident on the first phase retardation layer PHL1', a retardation can be provided only for the first retardation axis, so that the circularly polarized light can be changed into linearly polarized light and can be transmitted. That is to say, the twenty-first light can be the light among the twentieth light that has been transmitted through the first phase retardation layer PHL1', and can be linearly polarized light.

[0182] The linear polarization direction of the twenty-first light may be opposite to that of the eighteenth light. That is to say, since the twenty-first light is the light that has passed through the first phase retardation layer PHL1' in the twentieth light, the phase of the twentieth light has been inverted by approximately 180 degrees by the common electrode CTE', so the linear polarization direction of the twenty-first light may be opposite to that of the eighteenth light. Therefore, the linear polarization direction of the twenty-first light may be the same as the first light absorption axis of the first absorption polarizer APOL1. Therefore, the twenty-first light can be absorbed by the first absorption polarizer APOL1. In other words, the twenty-first light may not transmit through the first absorption polarizer APOL1.

[0183] In an embodiment, assuming that the first light absorption axis of the first absorption polarizer APOL1 is approximately 0 degrees, and the first phase retardation layer PHL1' provides retardation only in the 45-degree direction for the retardation axis, the seventeenth and eighteenth lights may be linearly polarized lights of approximately 90 degrees, the nineteenth light may be a right-handed circularly polarized light, the twentieth light may be a left-handed circularly polarized light, and the twenty-first light may be a linearly polarized light of approximately 0 degrees. Therefore, for example, the twenty-first light can be absorbed by the first absorption polarizer APOL1.

[0184] As a result, the light reflected from the common electrode CTE' of the display panel DP' is substantially invisible to the user UR because it is absorbed and disappears by the first absorption polarizer APOL1. Therefore, virtual images due to the reflection of the common electrode CTE' can be reduced or prevented.

[0185] In particular, since no separate polarizer is provided between the first phase retardation layer PHL1' and the first absorption polarizer APOL1, the light reflected from the common electrode CTE' of the display panel DP' can transmit through the first phase retardation layer PHL1' and be directly absorbed by the first absorption polarizer APOL1. Therefore, the light reflected from the common electrode CTE' of the display panel DP' can more easily disappear through the first absorption polarizer APOL1.

[0186] Figure 8 is a schematic diagram showing another embodiment of a display device. Figure 9 is shown in Figure 8 a schematic cross-sectional view of a display panel included in a display device.

[0187] Referring to Figure 8 and Figure 9 , except that the second phase retardation layer is omitted in the display panel DP", and the first lens unit LSP1" has a second phase retardation layer PHL2", the display device DD" may be the same as the reference Figure 1 and Figure 2The described display device DD is substantially the same or similar. Therefore, overlapping descriptions are omitted or simplified.

[0188] 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 a user UR (e.g., the user UR's eyes).

[0189] As Figure 8 shown, 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 overlaps with the description of the reference Figure 1 description. In addition, except that it further includes a second phase retardation layer PHL2", the first lens portion LSP1" may be substantially the same as the first lens portion LSP1 described in the reference Figure 1 description. Therefore, the overlapping description is omitted.

[0190] 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 substantially the same as the second phase retardation layer PHL2 described in the reference Figure 2 description. Therefore, the detailed description is omitted.

[0191] When the first lens portion LSP1" includes the second phase retardation layer PHL2", as Figure 9 shown, the second phase retardation layer (refer to PHL2 in Figure 2 ) 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.

[0192] Figure 10 is a schematic diagram showing another embodiment of the display device. Figure 11 is a schematic cross-sectional view of a display panel included in the display device in Figure 10 .

[0193] Referring to Figure 10 and Figure 11 , except that the second phase retardation layer is omitted in the display panel DP”', and the first lens portion LSP1”' has a second phase retardation layer PHL2”', the display device DD”' may be substantially the same or similar to the display device DD' described in the reference Figure 5 and Figure 6 description. Therefore, overlapping descriptions are omitted or simplified.

[0194] 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 a user UR (e.g., the eyes of the user UR).

[0195] As Figure 10 shown, 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 overlaps with the description of the reference Figure 5 description. In addition, except that it further includes a second phase retardation layer PHL2”', the first lens portion LSP1”' may be substantially the same as the first lens portion LSP1' of the reference Figure 5 description. Therefore, the overlapping description is omitted.

[0196] 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 substantially the same as the second phase retardation layer PHL2' of the reference Figure 6 description. Therefore, the detailed description is omitted.

[0197] When the first lens portion LSP1”' includes the second phase retardation layer PHL2”', as Figure 11 shown, the second phase retardation layer (refer to PHL2' in Figure 6 ) 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.

[0198] 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 the 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 can be improved, and the three-dimensional effect of the image can also be improved.

[0199] In addition, the display panel may have a structure in which a light-emitting device portion, a phase retardation layer having reverse wavelength dispersion characteristics, 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, virtual images due to the reflection of the common electrode can be reduced or prevented.

[0200] Although the present invention has been particularly shown and described with reference to embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and detail may be made therein without departing from the spirit or scope of the present invention as defined by the appended claims.

Claims

1. A display device, characterized in that, The display device includes: A display panel, including: A light-emitting device section including a light-emitting device; A first phase retardation layer disposed on the light-emitting device section and having reverse wavelength dispersion characteristics; and An absorption polarizer disposed on the first phase retardation layer; and An optical panel disposed on the display panel, the optical panel including: A first lens section disposed on the display panel and including a beam splitter; and A second lens section disposed on the first lens section and including a reflective polarizer.

2. The display device according to claim 1, characterized in that The first phase retardation layer includes at least one of a reverse wavelength dispersion film and a reverse wavelength dispersion liquid crystal; 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; or, the reverse wavelength dispersion liquid crystal included in the first phase retardation layer is a liquid crystal in which a conventional dispersion liquid crystal element and a reverse dispersion liquid crystal element are mixed.

3. 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.

4. The display device according to claim 1, wherein The absorption polarizer of the display panel has a light absorption axis, absorbs the polarized light of the light absorption axis, and transmits the polarized light perpendicular to the light absorption axis, and The reflective polarizer of the second lens section has a reflection axis, reflects the polarized light of the reflection axis, and transmits the polarized light perpendicular to the reflection axis, wherein the light absorption axis and the reflection axis have the same direction as each other.

5. The display device according to claim 1, characterized in that, The first phase retardation layer has a first retardation axis, delays the light in the 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.

6. The display device according to claim 1, wherein The display panel further includes: A second phase retardation layer disposed on the absorption polarizer, having a second retardation axis, delaying the light in the direction of the second retardation axis by λ / 4, and changing linearly polarized light into circularly polarized light or changing circularly polarized light into linearly polarized light.

7. The display device according to claim 1, wherein The light-emitting device includes 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 the light reflected from the common electrode transmits through the first phase retardation layer and is absorbed by the absorption polarizer.

8. The display device according to claim 1, wherein No separate polarizer is provided between the first phase retardation layer and the absorption polarizer.

9. A display device, characterized in that, The display device includes: A display panel, including: A light-emitting device section including a light-emitting device; A first phase retardation layer disposed on the light-emitting device section and having reverse wavelength dispersion characteristics; A first absorption polarizer disposed on the first phase retardation layer; and A reflective polarizer disposed on the first absorption polarizer; and An optical panel disposed on the display panel, the optical panel including: A first lens section disposed on the display panel and including a beam splitter; and A second lens section disposed on the first lens section and including a second absorption polarizer.

10. The display device according to claim 9, wherein The first phase retardation layer includes at least one of a reverse wavelength dispersion film and a reverse wavelength dispersion liquid crystal; 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; or, the reverse wavelength dispersion liquid crystal included in the first phase retardation layer is a liquid crystal in which a conventional dispersion liquid crystal element and a reverse dispersion liquid crystal element are mixed.

11. The display device according to claim 9, wherein The first phase retardation layer has a structure in which two or more phase retardation layers having different retardation axes are sequentially stacked.

12. The display device according to claim 9, characterized in that, 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 absorption 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. Wherein, the first light absorption axis, the reflection axis and the second light absorption axis have the same direction as each other.

13. The display device according to claim 9, characterized in that, The first phase retardation layer has a first retardation axis, delays light in the 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.

14. The display device according to claim 9, wherein The display panel further includes: A second phase retardation layer, disposed on the first absorption polarizer, having a second retardation axis, delaying light in the direction of the second retardation axis by λ / 4, and changing linearly polarized light into circularly polarized light or changing circularly polarized light into linearly polarized light.

15. The display device according to claim 9, wherein The light-emitting device includes 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 The light reflected from the common electrode transmits through the first phase retardation layer and is absorbed by the first absorption polarizer.

16. The display device according to claim 9, wherein The light-emitting device portion, the first phase retardation layer, the first absorption polarizer, and the reflective polarizer are sequentially stacked.

17. The display device according to claim 9, characterized in that, No separate polarizer is provided between the first phase retardation layer and the first absorption polarizer.

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