Light-emitting display device

Abstract

A light emitting display device is provided. The light emitting display device includes: a display panel including a light emitting diode; the front C plate is arranged on the front surface of the display panel; the front plate A is arranged on the front surface of the front plate C; the negative A plate is arranged on the front surface of the positive A plate; and a polarizer disposed on the front surface of the negative A plate, in which the polarizer includes: a polarizing layer having an absorption axis; and a negative C-plate disposed between the polarization layer and the negative A-plate, in which the positive C-plate, the positive A-plate, the negative A-plate, and the negative C-plate each have positive wavelength dispersion characteristics, and in which the light-emitting display device has negative wavelength dispersion characteristics on the front surface as a whole. The light-emitting display device has improved omnidirectional reflection characteristics or reflection color characteristics.

Description

[0001] This application claims priority to Korean Patent Application No. 10-2023-0120624 filed on September 11, 2023, and all benefits therefrom, the contents of which are incorporated herein in their entirety by reference. TECHNICAL FIELD

[0002] The present utility model relates to a light emitting display device, more particularly, to a light emitting display device including a polarizer and a compensation film on a front surface. BACKGROUND

[0003] The light emitting display device is a self-luminous display device that displays an image by emitting light from a light emitting diode.

[0004] Meanwhile, the liquid crystal display device displays an image by adjusting the degree of blocking light provided by a light unit, and two polarizers are formed at the top and bottom and the liquid crystal layer in order to block light.

[0005] Therefore, generally, unlike the liquid crystal display device, the light emitting display device can display an image without including a polarizer. SUMMARY

[0006] Embodiments provide a light emitting display device that prevents external light from being reflected.

[0007] Embodiments provide a light emitting display device that has improved omnidirectional reflection characteristics or reflection color characteristics by having negative wavelength dispersion.

[0008] Embodiments provide a light emitting display device that is formed to have negative wavelength dispersion by combining layers that each have positive dispersion.

[0009] In an embodiment, the light emitting display device includes a display panel including a light emitting diode, a positive C plate disposed on a front surface of the display panel, a positive A plate disposed on a front surface of the positive C plate, a negative A plate disposed on a front surface of the positive A plate, and a polarizer disposed on a front surface of the negative A plate, wherein the polarizer includes a polarizing layer having an absorption axis and a negative C plate disposed between the polarizing layer and the negative A plate, wherein the positive C plate, the positive A plate, the negative A plate, and the negative C plate each have a positive wavelength dispersion characteristic, and wherein the light emitting display device as a whole has a negative wavelength dispersion characteristic on the front surface.

[0010] In an embodiment, the light emitting display device has a front surface reflectance of about 10% or less for external light.

[0011] In an embodiment, the positive C plate, the positive A plate, and the negative A plate are formed by aligning liquid crystal molecules, and the negative C plate can be attached to one side of the polarizing layer in the form of a film.

[0012] In an embodiment, the positive C plate can have a thickness direction retardation value in a range of about -50 nm or more and about -85 nm or less.

[0013] In an embodiment, the positive A plate can have an in-plane retardation value in a range of about 160 nm or more and about 180 nm or less.

[0014] In an embodiment, liquid crystal molecules included in the positive A plate have a twisted liquid crystal array, wherein the twisted liquid crystal molecules in the positive A plate have an alignment angle of about 50 degrees with respect to the first direction and an inclination angle of about -31 degrees with respect to the first direction.

[0015] In an embodiment, the negative A plate can have an in-plane retardation value in a range of about -160 nm or more and about -180 nm or less.

[0016] In an embodiment, the negative A plate can have a retardation axis having an angle of about -31 degrees with respect to the first direction.

[0017] In an embodiment, the negative C plate can have a thickness direction retardation value in a range of about 10 nm or more and about 50 nm or less.

[0018] In an embodiment, the absorption axis of the polarizing layer can have an angle of about 45 degrees with respect to the first direction.

[0019] In an embodiment, the light emitting display device can further include an adhesive layer disposed between the positive A plate and the negative A plate and between the negative A plate and the polarizer.

[0020] In an embodiment, the light emitting display device includes a display panel including a light emitting diode, a positive C plate disposed on a front surface of the display panel, a positive A plate disposed on a front surface of the positive C plate, a negative A plate disposed on a front surface of the positive A plate, and a polarizer disposed on a front surface of the negative A plate, wherein the polarizer includes a polarizing layer having an absorption axis and a negative C plate disposed between the polarizing layer and the negative A plate, wherein the positive C plate has a thickness direction retardation value in a range of about -50 nm to about -85 nm, wherein the positive A plate has an in-plane retardation value in a range of about 160 nm or more and about 180 nm or less, wherein the negative A plate has an in-plane retardation value in a range of about -160 nm or more and about -180 nm or less, and wherein the negative C plate has a thickness direction retardation value in a range of about 10 nm or more and about 50 nm or less.

[0021] In an embodiment, the positive C plate can be formed by orienting liquid crystal molecules.

[0022] In an embodiment, the positive A plate is formed by twisting liquid crystal molecules, wherein the twisted liquid crystal molecules of the positive A plate can have an angle of about 50 degrees as an alignment angle in the first direction and can have an angle of about -31 degrees as a tilt angle in the first direction.

[0023] In an embodiment, the negative A plate is formed by aligning liquid crystal molecules, wherein the negative A plate can have a retardation axis at an angle of about -31 degrees with respect to the first direction.

[0024] In an embodiment, the negative C plate can be attached to one side of the polarizing layer in the form of a film.

[0025] In an embodiment, the absorption axis of the polarizing layer can have an angle of about 45 degrees with respect to the first direction.

[0026] In an embodiment, the light emitting display device can further include an adhesive layer disposed between the positive A plate and the negative A plate.

[0027] In an embodiment, the light emitting display device can further include an adhesive layer disposed between the negative A plate and the polarizer.

[0028] In an embodiment, the positive C plate, the positive A plate, the negative A plate, and the negative C plate each have a positive wavelength dispersion characteristic, and can be configured to have an overall negative wavelength dispersion characteristic in the front surface.

[0029] According to an embodiment, the negative C plate is formed inside the polarizer, and the negative A plate and the positive A plate are disposed below the negative C plate, the light emitting display device can have a negative wavelength dispersion characteristic, can reduce reflectivity of external light, and can enhance an omnidirectional reflection characteristic or a reflection color characteristic.

[0030] According to an embodiment, the light emitting display device can have a negative wavelength dispersion although only layers each having a positive wavelength dispersion are used. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other advantages and features of the utility model will become more apparent from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0032] Figure 1 is an exploded schematic view of a light emitting display device according to an embodiment.

[0033] Figure 2 is a schematic cross-sectional view of a light emitting display device according to an embodiment. Figure 1

[0034] Figure 3 is a schematic cross-sectional view of an optical layer disposed on a front surface of a display panel in a light emitting display device according to an embodiment. Figure 1

[0035] ​​Figure 4 is a diagram illustrating a specific structure of some of the optical layers of the display panel according to the embodiment. Figure 3

[0036] Figure 5 is a diagram illustrating a structure of a positive C plate according to the embodiment.

[0037] Figure 6 is a diagram illustrating a structure of a positive C plate according to the embodiment.

[0038] Figure 7 is a diagram illustrating a structure of a positive A plate according to the embodiment.

[0039] Figure 8 is a diagram illustrating a structure of a positive A plate according to the embodiment.

[0040] Figure 9 is a diagram illustrating a structure of a negative A plate according to the embodiment.

[0041] Figure 10 is a diagram illustrating a structure of a negative A plate according to the embodiment.

[0042] Figure 11 is a diagram illustrating a structure of a negative C plate according to the embodiment.

[0043] Figure 12 is a diagram illustrating a structure of a negative C plate according to the embodiment.

[0044] Figure 13 is a diagram illustrating anisotropic properties according to the embodiment.

[0045] Figure 14 is a spherical coordinate diagram illustrating polarization properties of a light-emitting display device according to the embodiment to help understand Figure 3 .

[0046] Figure 15 is a spherical coordinate diagram illustrating polarization properties of a light-emitting display device according to the embodiment to help understand Figure 3 .

[0047] Figure 16 is a spherical coordinate diagram illustrating polarization properties of a light-emitting display device according to the embodiment to help understand Figure 3 .

[0048] Figure 17 is a spherical coordinate diagram illustrating polarization properties of a light-emitting display device according to the embodiment to help understand Figure 3 .

[0049] Figure 18 is a spherical coordinate diagram illustrating polarization properties of a light-emitting display device according to the embodiment to help understand Figure 3 .​

[0050] Figure 19 is a polar coordinate graph of the polarizing characteristics of the light-emitting display device according to the embodiment shown to help understand Figure 3

[0051] Figure 20 is a polar coordinate graph of the polarizing characteristics of the light-emitting display device according to the embodiment shown to help understand Figure 3

[0052] Figure 21 is a polar coordinate graph of the polarizing characteristics of the light-emitting display device according to the embodiment shown to help understand Figure 3

[0053] Figure 22 is a graph showing the structure and reflection characteristics of a comparative example and some examples according to the embodiment.

[0054] Figure 23 is a graph showing the structure and reflection characteristics of a comparative example and some examples according to the embodiment.

[0055] Figure 24 is a graph showing the reflection characteristics according to the angle of some plates included in the optical layer according to the embodiment.

[0056] Figure 25 is a graph showing the reflection characteristics according to the angle of some plates included in the optical layer according to the embodiment.

[0057] Figure 26 is a graph showing the reflection characteristics according to the angle of some plates included in the optical layer according to the embodiment.

[0058] Figure 27 is a graph showing the reflection characteristics according to the angle of some plates included in the optical layer according to the embodiment.

[0059] Figure 28 is a graph showing the structure and reflection characteristics of a comparative example and some examples according to the embodiment.

[0060] Figure 29 is a graph showing the structure and reflection characteristics of a comparative example and some examples according to the embodiment.

[0061] Figure 30 is a graph showing the reflection characteristics of a comparative example and various examples according to the embodiment.

[0062] Figure 31 is a graph showing various optical properties of the film according to the stretching according to the embodiment.

[0063] Figure 32 ​​​FIG. 1 is a diagram illustrating various examples of a light arrangement according to an embodiment.

[0064] Figure 33 FIG. 2 is a diagram illustrating various examples of a rod structure liquid crystal molecule according to an embodiment. DETAILED DESCRIPTION

[0065] Hereinafter, various embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present application.

[0066] The present application can be implemented in many different forms and is not limited to the embodiments described herein.

[0067] In order to clearly explain the present application, parts irrelevant to the description are omitted, and the same or similar components are given the same reference numerals throughout the specification. Within the drawings and text of the present disclosure, a reference numeral indicating a singular element can also be used to refer to a plurality of singular elements.

[0068] Furthermore, the size and thickness of each component shown in the drawings are arbitrarily shown for the sake of convenience of explanation, and thus the present application is not limited to the size and thickness shown.

[0069] In the drawings, the thickness is exaggerated to clearly show the various layers and regions.

[0070] And in the drawings, the thickness of some layers and regions is exaggerated for the sake of convenience of explanation.

[0071] Furthermore, when a part such as a layer, film, region, plate, or component is referred to as being "on" another element, such as "on the top of" or "on" another part, this means not only that the part is "directly on" the other part, but also that there can be another part therebetween. In contrast, when a part is referred to as being "directly on" another part, this means that there is no other part therebetween.

[0072] Furthermore, "on" or "above" a reference part means disposed above or below the reference part, not necessarily in a direction opposite to gravity.

[0073] Furthermore, throughout the specification, when a part is referred to as "including" a specific component, this means that the part can also include other components, not excluding other components, unless specifically stated to the contrary.

[0074] Furthermore, throughout the specification, when "in plan" is mentioned, this means when the target part is viewed from above, and when "in cross-section" is mentioned, this means when a cross-section of the target part is cut vertically and viewed from the side.

[0075] Also, throughout the specification, when it is used that “connected”, this means not only when two or more components are directly connected, but also when two or more components are indirectly connected through other components. When it is used that “connected to each other”, this can include not only the case of a physical connection or an electrical connection, but also the case where each part is substantially integrated, although they are called different names according to a position or a function.

[0076] Also, throughout the specification, when a portion such as a wire, a layer, a film, a region, a plate, or a component is referred to as “extending in a first direction or a second direction”, this means not only a straight shape extending in the direction, but rather a structure in which the entirety extends along the first direction or the second direction, and can also include a structure which is bent at some portions, has a zigzag structure, or extends while including a bent structure.

[0077] Also, the electronic device includes a mobile phone, a TV, a monitor, a laptop, etc. including the display device, the display panel, etc. described in the specification, the display device, the display panel, etc. manufactured by the manufacturing method described in the specification, and the like, and the electronic device included herein is not excluded from the scope of the disclosure.

[0078] It will be understood that, although the terms “first”, “second”, “third”, etc. can be used herein to describe various elements, components, regions, layers and / or portions, these elements, components, regions, layers and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or portion from another element, component, region, layer or portion. Thus, “a first element”, “a first component”, “a first region”, “a first layer” or “a first portion” discussed below can be termed a second element, a second component, a second region, a second layer or a second portion without departing from the teachings herein.

[0079] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, “a”, “an”, “the”, and “at least one” are not intended to refer to a quantity of, but to include the singular and the plural, both. For example, “an element” has the same meaning as “at least one element”, unless the context clearly indicates otherwise. “At least one” is not to be interpreted to limit “a” or “an”. “Or” means “and / or”. As used herein, the term “and / or” includes any combination and all combinations of one or more of the associated listed items. Also, the words “comprise”, “comprising”, “comprises”, “include”, “including”, “includes”, “contain”, “containing”, “contains”, and the like, are to be understood as meaning including but not limited to, unless explicitly described otherwise.

[0080] As used herein, “about” or “approximately” includes the stated value and means: within an acceptable deviation of the particular value, taking into account the measurement in question and the error associated with the measurement of the particular quantity (i.e., the limitations of the measurement system), as determined by one of ordinary skill in the art. For example, “about” can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, or ±5% of the stated value.

[0081] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will also be understood that terms (such as those defined in common dictionaries) shall be interpreted as having the same meaning as they have in the relevant field and in the context of this disclosure, and shall not be interpreted in an idealized or overly formal sense, unless expressly defined herein.

[0082] The embodiments described herein are illustrated with cross-sectional views as schematic examples of idealized embodiments. Thus, variations in the shapes of the figures will be anticipated due to factors such as manufacturing techniques and / or tolerances. Therefore, the embodiments described herein should not be construed as limited to the specific shapes of the areas shown herein, but will include shape deviations, for example, due to manufacturing processes. For instance, areas shown or described as flat may generally have rough and / or non-linear characteristics. Furthermore, acute angles shown may be rounded (rounded). Therefore, the areas shown in the figures are schematic in nature, and their shapes are not intended to show the precise shapes of the areas, nor are they intended to limit the scope of the given claims.

[0083] In the following text, it will be through Figure 1 and Figure 2 A brief description of the light-emitting display device 10 according to an embodiment.

[0084] Figure 1 This is a schematic exploded view of a light-emitting display device according to an embodiment, and Figure 2 According to the embodiments Figure 1 A schematic cross-sectional view of a light-emitting display device.

[0085] In an embodiment, the light-emitting display device 10 may include a display panel 100 and an optical layer disposed on the front surface of the third-direction DR3.

[0086] In an embodiment, the optical layer includes a polarizer 120, a negative A plate 113, a positive A plate 112, and a positive C plate 111.

[0087] In this embodiment, the optical layers are arranged on the display panel 100 in the following order on the third-direction DR3: positive C plate 111, positive A plate 112, negative A plate 113 and polarizer 120.

[0088] Figure 13 Embodiments of the positive characteristics, negative characteristics, and refractive index characteristics of the A-plate and the C-plate are shown in the following table.

[0089] In an embodiment, the display panel 100 includes a plurality of pixels, wherein one pixel includes a light emitting diode and a plurality of transistors that supply a driving current to the light emitting diode to make it emit light.

[0090] In an embodiment, the plurality of transistors can include a driving transistor that outputs a driving current to be transmitted to the light emitting diode and a plurality of switching transistors, and can further include a capacitor.

[0091] In an embodiment, the light emitting diode can be an organic light emitting diode or an inorganic light emitting diode.

[0092] The structure of the optical layer disposed on the front surface (e.g., front surface) of the display panel 100 will be discussed in more detail. Figure 3

[0093] Figure 3 is a schematic cross-sectional view of the optical layer disposed on the front surface of the display panel in the light emitting display device according to an embodiment. Figure 1 In an embodiment, the light emitting display device 10 has a positive C-plate 111, a positive A-plate 112, a negative A-plate 113, and a polarizer 120 sequentially disposed on the front side (upper side in the third direction DR3) of the display panel 100 from which light emitted from the light emitting diode disposed in the display panel 100 is emitted.

[0094] In an embodiment, with reference to

[0095] , an adhesive layer 130 is disposed between the positive A-plate 112 and the negative A-plate 113 and between the negative A-plate 113 and the polarizer 120 to attach them. Figure 3

[0096] In an embodiment, the adhesive layer 130 can also be disposed between the positive C-plate 111 and the positive A-plate 112 and / or between the positive C-plate 111 and the display panel 100.

[0097] In an embodiment, with reference to Figure 3 , the polarizer 120 is composed of multiple layers and includes a negative C-plate (122, also referred to as a back protective layer or a first protective layer) and a front protective layer (123, also referred to as a second protective layer) that protect the polarizing layer 121 and provide a phase difference (retardation) for light transmitted through the polarizing layer 121.

[0098] ​​In an embodiment, among the optical layers included in the light emitting display device 10, the polarizing layer 121 included in the polarizer 120 blocks light in a certain direction and transmits light in a direction perpendicular to the certain direction.

[0099] In an embodiment, the polarizing layer 121 has an absorption axis and does not transmit linearly polarized light in the direction of the absorption axis but allows light perpendicular to the absorption axis to be transmitted.

[0100] In an embodiment, among the optical layers included in the light emitting display device 10, layers other than the polarizing layer 121 and the adhesive layer 130, i.e., the positive C plate 111, the positive A plate 112, the negative A plate 113, and the negative C plate 122, can provide a phase difference to transmitted light.

[0101] In an embodiment, the optical properties of the polarizing layer 121, the positive C plate 111, the positive A plate 112, the negative A plate 113, and the negative C plate 122 included in the optical layers are shown in Figures 4 to 12 and are described in detail, and since the anisotropic properties are shown separately in Figure 13 , they will be discussed in detail through Figures 4 to 13 .

[0102] Figure 4 are diagrams showing specific structures of some of the optical layers according to an embodiment, Figure 3 and Figure 5 are diagrams showing the structure of a positive C plate according to an embodiment, Figure 6 and Figure 7 are diagrams showing the structure of a positive A plate according to an embodiment, Figure 8 and Figure 9 are diagrams showing the structure of a negative A plate according to an embodiment, and Figure 10 and Figure 11 are diagrams showing the structure of a negative C plate according to an embodiment, and Figure 12 is a diagram showing anisotropic properties according to an embodiment. Figure 13 In an embodiment, referring to

[0103] , the properties of the positive C plate 111, the positive A plate 112, the negative A plate 113, and the negative C plate 122 are shown, and in Figures 5 to 12 , the properties of the polarizing layer 121 are shown in connection with the features of Figure 4 . Figures 5 to 12 In an embodiment, referring to

[0104] , the polarizing layer 121 has an absorption axis having an angle of about 45 degrees with respect to the first direction DR1 and / or the second direction DR2, and can transmit light in a direction perpendicular to the absorption axis. Figure 4

[0105] ​In an embodiment, the polarizer 120 including the polarizing layer 121 and the negative C-plate 122 can be formed in a film form, and the polarizer 120 can be formed in a structure in which two film-like layers 122 and 123 are formed and attached to both sides of the polarizing layer 121 having a film form.

[0106] In an embodiment, referring to Figure 4 and Figure 13 , the positive C-plate 111 disposed closest to the display panel 100 among the optical layers has refractive indices (n x , n y , n z ) for three axes (x, y, z) of "n z >n x =n y ".

[0107] In an embodiment, the three axes (x, y, z) are three axes formed by liquid crystal molecules constituting the positive C-plate 111, and can be the same as or different from the first direction DR1, the second direction DR2, and the third direction DR3 according to the arrangement of the liquid crystal molecules.

[0108] In an embodiment, in Figure 5 , a structure of the liquid crystal molecules 111-lq included in the positive C-plate 111 when viewed from the side is shown, and in Figure 6 , the liquid crystal molecules 111-lq are viewed from above in the third direction DR3 (hereinafter, referred to as a structure when viewed from the front (also referred to as front view)).

[0109] In an embodiment, the shape of the liquid crystal molecules 111-lq is shown as a shape corresponding to the size of the refractive indices (n x , n y , n z ).

[0110] In an embodiment, the liquid crystal molecules 111-lq of the positive C-plate 111 have the highest refractive index (n z ) with respect to the z-axis, and in Figure 5 , the liquid crystal molecules 111-lq have a long structure in the third direction DR3, and thus in the positive C-plate 111, the z-axis of the liquid crystal molecules 111-lq is oriented in the same direction as the third direction DR3.

[0111] In an embodiment, the arrangement direction of the liquid crystal molecules 111-lq in the positive C-plate 111 can differ from the third direction DR3 by about 10 degrees.

[0112] In an embodiment, referring to Figure 6 , since the liquid crystal molecules 111-lq have the same refractive indices (n x , n y), so it can be confirmed that the profile of the liquid crystal molecules 111-lq has a circular structure.

[0113] In the embodiment, with reference to Figure 5 and Figure 6 , the liquid crystal molecules 111-lq included in the positive C-plate 111 have a structure in which the z-axis is aligned in the third direction DR3.

[0114] In the embodiment, the positive C-plate 111 can be formed by forming the liquid crystal molecules 111-lq in the above alignment direction.

[0115] In the embodiment, the positive C-plate 111 can provide a phase difference of about -50 nm to about -85 nm as an Rth (out-of-plane retardation or thickness direction retardation) value to the transmitted light, and has an Ro (in-plane retardation) value close to about 0.

[0116] In the embodiment, with reference to Figure 4 and Figure 13 , the positive A-plate 112 disposed above the positive C-plate 111 has a relationship of "n x >n y =n z " for the refractive indexes (n x , n y , n z ) of the three axes (x, y, z).

[0117] In the embodiment, the three axes (x, y, z) are three axes formed by the liquid crystal molecules constituting the positive A-plate 112, and can be the same as or different from the first direction DR1, the second direction DR2, and the third direction DR3 according to the alignment of the liquid crystal molecules.

[0118] In the embodiment, in Figure 7 , a structure of the liquid crystal molecules 112-lq included in the positive A-plate 112 is shown when viewed from the side, and in Figure 8 , the liquid crystal molecules 112-lq are viewed from above in the third direction DR3 (hereinafter, referred to as a structure when viewed from the front - also referred to as front view).

[0119] In the embodiment, the shape of the liquid crystal molecules 112-lq is shown as a shape corresponding to the sizes of the refractive indexes (n x , n y , n z ).

[0120] In the embodiment, the liquid crystal molecules 112-lq of the positive A-plate 112 have the highest refractive index (n x ) with respect to the x-axis, and in Figure 7In the liquid crystal molecule 112-lq, the direction of the longest x-axis is not constant, but has a rotating structure, so the liquid crystal molecule 112-lq has a twisted liquid crystal array.

[0121] In the embodiments, reference is made to Figure 7 and Figure 8 The liquid crystal molecules 112-lq with the twisted liquid crystal array have an orientation angle 112-da and a tilt angle 112-dt.

[0122] In the embodiments, reference is made to Figure 7 The orientation angle 112-da is the direction of the liquid crystal molecule 112-lq disposed at the bottom of the third-direction DR3 among the plurality of liquid crystal molecules 112-lq included in the positive A plate 112, and the tilt angle 112-dt can be the direction of the liquid crystal molecule 112-lq disposed at the top of the third-direction DR3 among the plurality of liquid crystal molecules 112-lq included in the positive A plate 112.

[0123] In the embodiments, reference is made to Figure 8 The plurality of liquid crystal molecules 112-lq included in the positive A plate 112 have a twisted liquid crystal array and are therefore shown as a fan shape.

[0124] In the embodiments, reference is made to Figure 8 The orientation angle 112-da of the liquid crystal molecules 112-lq in the positive A plate 112 is an angle of about 50 degrees relative to the first direction DR1, and the tilt angle 112-dt can have an angle of about -31 degrees relative to the first direction DR1.

[0125] In this embodiment, the orientation angle 112-da and tilt angle 112-dt of the liquid crystal molecules 112-lq of the positive A plate 112 can differ from the angles of this embodiment by less than about 10 degrees.

[0126] In an embodiment, the positive A plate 112 can be formed by forming liquid crystal molecules 112-lq in the above-described arrangement direction.

[0127] In an embodiment, the positive A plate 112 can provide a phase difference of about 160 nm or more and about 180 nm or less as an in-plane delay value for the transmitted light, and has an Rth (out-of-plane delay) value close to about 0.

[0128] In an embodiment, such as Figure 4 and Figure 13 As shown, the refractive index (n) of the negative A plate 113 positioned above the positive A plate 112 with respect to the three axes (x, y, z) is... x n y n z ) has "n x <n y= n z ” relationship.

[0129] In the embodiment, the three axes (x, y, z) are three axes formed by liquid crystal molecules that constitute the negative A plate 113, and can be the same as or different from the first direction DR1, the second direction DR2, and the third direction DR3 according to the arrangement of the liquid crystal molecules.

[0130] In the embodiment, in Figure 9 , a structure of the liquid crystal molecules 113-lq included in the negative A plate 113 when viewed from the side is shown, and in Figure 10 , the liquid crystal molecules 113-lq are shown as viewed from above in the third direction DR3 (hereinafter, referred to as a structure when viewed from the front - also referred to as front view).

[0131] In the embodiment, the shape of the liquid crystal molecules 113-lq is shown as a shape corresponding to the sizes of the refractive indexes (n x , n y , n z ).

[0132] In the embodiment, the liquid crystal molecules 113-1q of the negative A plate 113 have a minimum refractive index (n x ) with respect to the direction of the slow axis (also referred to as a “retardation axis”) 113-ds.

[0133] In the embodiment, with reference to Figure 10 , the retardation axis 113-ds of the liquid crystal molecules 113-lq can have an angle of about -31 degrees with respect to the first direction DR1.

[0134] In the embodiment, the direction of the retardation axis 113-ds of the liquid crystal molecules 113-lq in the negative A plate 113 can differ from the above-described angle by about 10 degrees.

[0135] In the embodiment, the negative A plate 113 can be formed by forming the liquid crystal molecules 113-lq in the above-described arrangement direction.

[0136] In the embodiment, the negative A plate 113 can provide a phase difference in a range of about -160 nm or more and about -180 nm or less as an Ro (in-plane retardation) value for the transmitted light, and have an Rth (out-of-plane retardation) value close to about 0.

[0137] In the embodiment, the negative C plate 122 included in the polarizer 120 and disposed below the polarizing layer 121 in the third direction DR3 can be formed in the form of a film attached to one side of the polarizing layer 121. For example, the negative C plate 122 can be in the form of a film and attached to one side of the polarizing layer 121.

[0138] In this embodiment, the negative C plate 122 can also be formed by arranging liquid crystal molecules.

[0139] In this embodiment, the negative C-plate 122 can be formed as a film, but for ease of optical study, a film-like shape is used. Figure 4 , Figure 11 and Figure 12 The optical properties of the liquid crystal molecule 122-lq are discussed based on its shape.

[0140] In the embodiments, reference is made to Figure 13 The negative C plate 122 has "n" relative to the three axes (x, y, z). x =n y >n z The refractive index relationship (n) x n y n z ).

[0141] In this embodiment, the three axes (x, y, z) are formed by the liquid crystal molecules constituting the negative C plate 122, and can be the same as or different from the first direction DR1, the second direction DR2 and the third direction DR3 depending on the arrangement of the liquid crystal molecules.

[0142] In the embodiments, in Figure 11 The diagram shows the structure of liquid crystal molecules 122-lq corresponding to the optical properties of the negative C plate 122 when viewed from the side. Figure 12 The image shows the liquid crystal molecule 122-lq as viewed from above on a third-direction DR3 (hereinafter referred to as the structure when viewed from the front - also known as front view).

[0143] In the embodiment, the shape of the liquid crystal molecule 122-lq is shown as being consistent with the refractive index (n). x n y n z The shape corresponding to the size of ().

[0144] In this embodiment, the liquid crystal molecules 122-lq of the negative C plate 122 have the minimum refractive index (n) relative to the z-axis. z ), and in Figure 11 In the negative C plate 122, the liquid crystal molecule 122-lq has a short structure on the third-direction DR3, so in the negative C plate 122, the z-axis of the liquid crystal molecule 122-lq is in the same direction as the third-direction DR3.

[0145] In an embodiment, the alignment direction of the liquid crystal molecules 122-lq in the negative C plate 122 can differ from that of the third-direction DR3 by approximately 10 degrees.

[0146] In the embodiments, reference is made to Figure 12Liquid crystal molecules 122-lq have the same refractive index (n) with respect to the x-axis and y-axis. x n y Therefore, it can be confirmed that the cross-section of the liquid crystal molecule 122-lq has a circular structure.

[0147] In the embodiments, reference is made to Figure 11 and Figure 12 The liquid crystal molecules 122-lq corresponding to the negative C plate 122 can have a structure in which the z-axis is arranged on the third direction DR3.

[0148] In an embodiment, the negative C plate 122 can provide the transmitted light with a phase difference ranging from about 10 nm to about 50 nm as an Rth (out-of-plane delay) value, and has an Ro (in-plane delay) value close to about 0.

[0149] Will pass Figures 14 to 21 The discussion includes the optical characteristics of the light-emitting display device 10, which has an optical layer with the aforementioned optical characteristics.

[0150] Figures 14 to 21 The embodiments are shown to aid understanding. Figure 3 A spherical coordinate diagram of the polarization characteristics of a light-emitting display device.

[0151] According to an embodiment, Figures 14 to 16 The polarization characteristics of the light-emitting display device are shown when viewed from the front (third-direction DR3). Figures 17 to 19 The polarization characteristics are shown when viewed from a side viewpoint at a specific angle to the front. Figure 20 and Figure 21 It shows from and Figures 17 to 19 Polarization characteristics when viewed from different surfaces.

[0152] In an embodiment, Figure 14 The diagram schematically illustrates the polarization characteristics when viewed from the front, and Figure 15 and Figure 16 The polarization characteristics when viewed from the front are shown in detail.

[0153] In an embodiment, Figure 17 The diagram schematically illustrates the polarization characteristics when viewed from the side, and Figure 18 and Figure 19 Detailed illustration Figure 17 The polarization characteristics.

[0154] In an embodiment, Figures 14 to 21 The polarization characteristics are shown using a spherical coordinate diagram, also known as a Poincaré sphere, which corresponds to the polarization state of a sphere with a radius of 1.

[0155] In an embodiment, when the polarization characteristics of light are represented as a 3x3 matrix, the matrix can also be represented as a vector.

[0156] In an embodiment, if a vector showing the polarization characteristics of light is plotted in three-dimensional coordinates, the polarization characteristics can be displayed on a spherical coordinate graph.

[0157] In an embodiment, in the spherical coordinate graph of Figures 14 to 21 , there are three axes (S1, S2, and S3), each of which can represent a specific polarization direction.

[0158] In an embodiment, the direction opposite to the S3 axis represents a direction perpendicular to the absorption axis of the polarization layer 121 (i.e., a direction corresponding to the transmission axis), considering that it becomes the same axis when the polarization axis is rotated by 180 degrees, and since the direction of the S3 axis differs by 90 degrees from the direction opposite to the same axis, it can represent a direction corresponding to the absorption axis of the polarization layer 121.

[0159] In an embodiment, the directions of the S1 axis and the S2 axis can indicate the directions of circular polarization, one of the S1 axis and the S2 axis can be left circular polarization, and the other can be right circular polarization.

[0160] In Figures 14 to 16 , the change in the polarization characteristics when viewed from the front (the third direction DR3) is shown.

[0161] According to an embodiment, Figure 15 is a spherical coordinate graph that more specifically shows Figure 14 , unlike Figure 14 and Figure 15 , which are spherical coordinate graphs that show the polarization characteristics of the light. Figure 16

[0162] In an embodiment, with reference to Figures 14 to 16 , the change in polarization is shown by an arrow, and although different changes in polarization can occur for red (R), green (G), and blue (B), the arrow is centered on green (G).

[0163] In an embodiment, two arrows are indicated, one of which represents the change in the polarization characteristics of the positive A plate 112 (referred to as the polarization change arrow of the positive A plate 112-pv) and the other of which represents the change in the polarization characteristics of the negative A plate 113 (referred to as the polarization change arrow of the negative A plate 113-pv).

[0164] In an embodiment, it can be confirmed that there is almost no change in polarization due to the positive C plate 111 and the negative C plate 122 included in the optical layer.

[0165] Since this is a feature from the front, when viewed from, for example, Figure 6 and​Figure 12 When viewed from the front face, according to the embodiment, the positive C-plate 111 and the negative C-plate 122 having a circular cross section do not affect the change in the polarization characteristics from the front face.

[0166] Furthermore, in the embodiment, with reference to Figures 14 to 16 , the final polarization characteristics through all the optical layers are set in the opposite direction of the S3 axis.

[0167] In the embodiment, as Figures 14 to 16 indicated in the drawing, red (R), green (G), and blue (B) each have different wavelengths, and thus a different change in the polarization characteristics can occur in the optical layers.

[0168] In the embodiment, since they are finally set in the opposite direction of the S3 axis, it can be confirmed that the light-emitting display device includes a feature of reducing the difference in the overall polarization characteristics.

[0169] In the embodiment, all the optical layers 111, 112, 113, and 122 having positive wavelength dispersion are used, but the optical layers 111, 112, 113, and 122 as a whole include negative wavelength dispersion, so that the polarization characteristics according to the wavelength are used, and the wavelength-dependent polarization characteristics including the difference-reducing feature are finally set in the opposite direction of the S3 axis.

[0170] More specifically, in the embodiment, the feature of the negative wavelength dispersion can be set in the negative C-plate 122 of the optical layers 111, 112, 113, and 122.

[0171] In the embodiment, with reference to Figures 14 to 16 , since the final polarization characteristics are all set in the opposite direction of the S3 axis, it can be seen that the difference in the polarization characteristics according to the wavelength is not increased but reduced in the front face, and can be set in the opposite direction of the S3 axis.

[0172] In the embodiment, the optical layers 111, 112, 113, and 122 all having positive wavelength dispersion are used, but the optical layers 111, 112, 113, and 122 have negative wavelength dispersion characteristics in the front face due to the negative C-plate 122, so that the polarization characteristics according to the wavelength are utilized, and it can be confirmed that it includes a feature of reducing the difference.

[0173] In the embodiment, by Figures 17 to 21 the change in the polarization characteristics when viewed from the side is shown. In Figures 17 to 19 , the angle is about 60 degrees with respect to the third direction DR3, and the azimuth angle is about 105 degrees with respect to the first direction DR1, so that the polarization characteristics are shown as viewed from the angle side.

[0174] In the embodiment, Figure 20 and Figure 21 the polarization characteristics are shown with respect to theFigures 17 to 19 the polarization characteristics at different side angles, and in Figure 20 and Figure 21 , the angle is about 60 degrees with respect to the third direction DR3, and the polarization characteristics are shown in the third direction DR3, so it shows the polarization characteristics observed from the side at an azimuth angle of about -15 degrees from the first direction DR1.

[0175] According to the embodiment, Figure 18 is a spherical coordinate diagram that shows Figure 17 in more detail, unlike Figure 17 and Figure 18 , which are spherical coordinate diagrams in which a direction opposite to the S3 axis is disposed at the center. Figure 19

[0176] In the embodiment, with reference to Figures 17 to 19 , the polarization change is shown by an arrow, although different polarization changes can occur for red (R), green (G), and blue (B), but the arrow is centered on green (G).

[0177] As shown, four arrows are indicated, and the arrows are an arrow showing a change in polarization characteristics due to the positive C plate 111 (111-pv, hereinafter also referred to as a polarization change arrow of the positive C plate), an arrow showing a change in polarization characteristics due to the positive A plate 112 (112-pv, hereinafter also referred to as a polarization change arrow of the positive A plate), an arrow showing a change in polarization characteristics due to the negative A plate 113 (113-pv, hereinafter also referred to as a polarization change arrow of the negative A plate 113), and an arrow showing a change in polarization characteristics due to the negative C plate 122 (122-pv, hereinafter also referred to as a polarization change arrow of the negative C plate).

[0178] Unlike Figures 14 to 16 , since this is a polarization characteristic observed from the side, in the embodiment, it can be confirmed that a change in polarization also occurs due to the positive C plate 111 and the negative C plate 122 having a circular cross section from the front.

[0179] Meanwhile, see Figure 20 and Figure 21 , which are as follows.

[0180] Unlike Figure 20 , the spherical coordinate diagram according to the embodiment is arranged such that a direction opposite to the S3 axis is disposed at the center. Figure 21 In the embodiment, with reference to

[0181] and Figure 20 , similarly to Figure 21 , the polarization change is shown by an arrow, although different polarization changes can occur for red (R), green (G), and blue (B), but the arrow is centered on green (G). Figures 17 to 19 ​the change in the polarization characteristics, four arrows (111-pv, 112-pv, 113-pv, 122-pv) are shown in total, but the direction of the change in the polarization characteristics is different from Figures 17 to 19 .

[0182] In an embodiment, with reference to Figures 17 to 21 , the final polarization characteristics are preferably directed in the opposite direction to the S3 axis in all directions, but the polarization direction of the side surface can slightly deviate from the opposite direction to the S3 axis so that it cannot be transmitted through the polarization layer 121 and a part thereof is absorbed.

[0183] In an embodiment, with reference to Figures 17 to 21 , the final polarization characteristics are set to be adjacent to the opposite direction of the S3 axis, and the difference in the polarization characteristics of each color at the final polarization position is reduced compared to the difference in the polarization characteristics of red (R), green (G), and blue (B) at the middle position of the change in the polarization.

[0184] In an embodiment, optical layers 111, 112, 113, and 122 having positive wavelength dispersion on all side surfaces are used, but the optical layers 111, 112, 113, and 122 have negative wavelength dispersion as a whole, thereby utilizing the polarization according to the wavelength, and it can be confirmed that it includes a feature of reducing the difference.

[0185] More specifically, in an embodiment, the feature of the negative wavelength dispersion can be provided in the negative C-plate 122 among the optical layers 111, 112, 113, and 122.

[0186] In an embodiment, with reference to Figures 17 to 21 , since the final polarization characteristics are all set in the vicinity of the opposite direction of the S3 axis, it can be seen that the difference in the polarization characteristics according to the wavelength on the side surface is not increased but reduced, and can be set in the opposite direction of the S3 axis.

[0187] Therefore, in an embodiment, the optical layers 111, 112, 113, and 122 all have positive wavelength dispersion, but have a negative wavelength dispersion feature on the side surface due to the negative C-plate 122, thereby utilizing the polarization characteristics according to the wavelength, and it can be confirmed that it has a feature of reducing the difference.

[0188] Hereinafter, the characteristics of the embodiment will be discussed by comparison with a comparative example of Figures 22 to 30 .

[0189] First, see Figure 22 and Figure 23 .

[0190] Figure 22 and Figure 23 are graphs showing the structure and reflection characteristics of the comparative example according to the embodiment.

[0191] In the embodiment, in Figure 22 In the embodiment, in Table 1, the characteristics of the optical layers 111, 112, 113, and 122 and the polarizing layer 121 of Comparative Example 1, Comparative Example 2, Embodiment 1, and Embodiment 2 are shown, and Figure 23 The results of the characteristics of each comparative example and the simulated reflection characteristics of the embodiments are shown.

[0192] In the embodiment, with reference to Figure 22 In Embodiment 1, the polarizing layer 121 has an absorption axis having an angle of about 45 degrees with respect to the first direction DR1 and / or the second direction DR2. The negative C-plate provides a phase difference of about 41.5 nm to the transmitted light as an Rth (out-of-plane retardation) value, and has an Ro (in-plane retardation) value close to about 0.

[0193] In Embodiment 1, the negative A-plate 113 provides a phase difference of about -177.5 nm to the transmitted light as an Ro (in-plane retardation) value, and the retardation axis (113-ds; slow axis) of the liquid crystal molecules 113-lq included in the negative A-plate 113 has an angle of about -31 degrees with respect to the first direction DR1.

[0194] Further, in Embodiment 1, the positive A-plate 112 provides a phase difference of 163.5 nm to the transmitted light as an Ro (in-plane retardation) value, and the angle of the orientation angle 112-da (bottom tilt) of the liquid crystal molecules 112-lq of the positive A-plate 112 has an angle of about 50 degrees with respect to the first direction DR1, while the tilt angle 112-dt (top tilt) has an angle of about -31 degrees with respect to the first direction DR1.

[0195] Further, in Embodiment 1, the positive C-plate 111 provides a phase difference of about -77.5 nm to the transmitted light as an Rth (out-of-plane retardation) value.

[0196] In the embodiment, with reference to Figure 22 In Embodiment 2, the polarizing layer 121 has an absorption axis having an angle of about 45 degrees with respect to the first direction DR1 and / or the second direction DR2, the negative C-plate 122 provides a phase difference of about 18 nm to the transmitted light as an Rth (out-of-plane retardation) value, and has an Ro (in-plane retardation) value close to about 0.

[0197] Further, in Embodiment 2, the negative A-plate 113 provides a phase difference of about -168 nm to the transmitted light as an Ro (in-plane retardation) value, and in the liquid crystal molecules 113-lq included in the negative A-plate 113, the retardation axis 113-ds has an angle of about -31 degrees with respect to the first direction DR1.

[0198] Further, in Embodiment 2, the positive A plate 112 provides a phase difference of about 163.5 nm to the transmitted light as a Ro (in-plane retardation) value, and in the orientation of the liquid crystal molecules 112-lq of the positive A plate 112, the orientation angle 112-da (bottom tilt) has an angle of about 50 degrees with respect to the first direction DR1, and the tilt angle 112-dt (top tilt) is an angle of about -31 degrees with respect to the first direction DR1.

[0199] Further, in Embodiment 2, the positive C plate 111 provides a phase difference of about -70 nm to the transmitted light as a Rth (out-of-plane retardation) value.

[0200] In the embodiments, reference is made to Figure 22 Comparative Example 1 and Comparative Example 2 do not include a negative C plate 122 disposed below the polarizing layer 121, such that the Rth (out-of-plane retardation or thickness direction retardation) value and the Ro (in-plane retardation) value are 0 (zero retardation).

[0201] Further, in the embodiments, Comparative Example 1 differs in that a plate having a negative wavelength dispersion is disposed at the position of the positive C plate 111 and the positive A plate 112.

[0202] In Figure 22 , embodiments of the angles of each of the optical layers 111, 112, 113, and 122, and the polarizing layer 121 are clearly described.

[0203] According to the embodiments, in Figure 23 , the reflection characteristics of the comparative examples and the embodiments shown in Figure 22 are simulated.

[0204] In the embodiments, reference is made to Figure 23 It can be seen that Embodiments 1 and 2 have lower reflectance than Comparative Examples 1 and 2, with little difference in the overall reflection color characteristics.

[0205] Here, even in the portion where the front reflectance has a maximum value, Embodiments 1 and 2 have a value lower than about 10%, and in the comparative examples, many portions have a front reflectance exceeding about 10%.

[0206] Thus, it can be confirmed that the embodiments are characterized in that the front reflectance of the external light has a value of about 10% or less.

[0207] In the embodiments, in Figure 23 , the overall reflection characteristics of the light-emitting display device are discussed, and below the characteristics of the reflectance according to the retardation values provided by some of the optical layers are discussed by Figures 24 to 27 .

[0208] Figures 24 to 27is a graph showing the reflectance characteristics according to the angle of some of the plates included in the optical layer according to an embodiment.

[0209] In an embodiment, Figure 24 and Figure 25 are measured from the front face (i.e. in the third direction DR3), wherein, in Figure 24 , a graph of the reflectance from the front face versus the retardation value provided by the negative A plate 113 is shown, Figure 25 a graph of the reflectance from the front face versus the retardation value provided by the positive C plate 111 is shown.

[0210] In an embodiment, Figure 26 and Figure 27 are measured from the side face having an angle of about 60 degrees with respect to the third direction DR3 and an azimuthal angle of about 135 degrees with respect to the first direction DR1, in Figure 26 , a graph of the reflectance on the corresponding side versus the retardation value provided by the negative A plate 113 is shown, in Figure 27 , a graph of the reflectance on the corresponding side versus the retardation value provided by the positive C plate 111 is shown.

[0211] In an embodiment, with reference to Figures 24 to 27 , the thick horizontal line shows the position where the reflectance is 0.00065%. This thick horizontal line represents the reference reflectance (SRL) and only the retardation values providing a reflectance lower than the SRL can be applied to the embodiment.

[0212] In an embodiment, this reference reflectance (SRL) can be set in various ways according to the location where the light-emitting display device is used.

[0213] In an embodiment, with reference to Figures 25 to 27 , some of the simulation results graphs are shown as being higher than the reference reflectance (SRL) because the graphs are copied according to the various variables considered during the simulation. From here, the discussion is based on the graph having the lowest reflectance.

[0214] First, the negative A plate 113 is observed by Figure 24 and Figure 26 .

[0215] In an embodiment, with reference to Figure 24 , in order to have a reference reflectance (SRL) or less from the front face, the retardation provided by the negative A plate 113 can have a value in the range of about -174 nm or more and about -192 nm or less.

[0216] In an embodiment, with reference to Figure 26In order to have a reference reflectance (SRL) or less at the corresponding side angle, the retardation provided by the negative A plate 113 can have a value in a range of about -174 nm or more and about -177.6 nm or less.

[0217] In an embodiment, considering the trend of the graph in Figure 24 and Figure 26 , even if the value is lower than about -174 nm, it seems sufficiently lower than the reference reflectance (SRL), so it is judged that it can have a retardation value of about -160 nm or more. When the front surface is considered as the center, in order to have a reflectance lower than the reference reflectance (SRL), it is judged that a retardation value of about -180 nm or less can be achieved.

[0218] According to an embodiment, the negative A plate 113 can have an in-plane retardation value of about -160 nm or more and about -180 nm or less.

[0219] Referring to Figure 25 and Figure 27 , the positive C plate 111 according to an embodiment is illustrated.

[0220] In an embodiment, referring to Figure 25 , in order to have a reference reflectance (SRL) or less from the front surface, the retardation provided by the positive C plate 111 can have a value in a range of about -73.5 nm or more and about -91 nm or less.

[0221] In an embodiment, referring to Figure 27 , in order to have a reference reflectance (SRL) or less at the corresponding side angle, the retardation provided by the positive C plate 111 can have a value in a range of about -73.5 nm or more and about -83.5 nm or less.

[0222] In an embodiment, considering the trend of the graph in Figure 25 and Figure 27 , even if the value is lower than about -73.5 nm, it seems sufficiently lower than the reference reflectance (SRL), so it is judged that it can have a retardation value of about -50 nm or more, and when the front surface is considered as the center, it is judged that, in order to have a reflectance lower than the reference reflectance (SRL), a retardation value of about -85 nm or less can be achieved.

[0223] According to an embodiment, the positive C plate 111 can have an in-plane retardation value of about -50 nm to about -85 nm.

[0224] The following corresponds to the embodiments in Figure 22 and Figure 23 , and embodiments 3 and 4 will be discussed with respect to Figure 28 and Figure 29 .

[0225] Figure 28 and Figure 29 are graphs showing the structure and reflection characteristics of comparative examples and some embodiments.

[0226] In the embodiments, Figure 28 Comparative Example 1 and Comparative Example 2 shown in Figure 22 are the same as Comparative Example 1 and Comparative Example 2 shown in Figure 28 The characteristics of the optical layers (111, 112, 113, 122) and the polarizing layer 121 of Comparative Example 1, Comparative Example 2, Embodiment 3, and Embodiment 4 are shown in tables, Figure 29 Results of simulation of the reflection characteristics of each of the comparative examples, Embodiment 3, and Embodiment 4 are shown.

[0227] In the embodiments, referring to Figure 28 the angles of each of the optical layers (111, 112, 113, 122) and the polarizing layer 121 are clearly described, and results of simulation of the reflection characteristics of the comparative examples as shown in Figure 29 and Embodiment 3 and Embodiment 4 are shown. Figure 28

[0228] In the embodiments, referring to Figure 28 In Embodiment 3, the polarizing layer 121 has an absorption axis having an angle of about 45 degrees with respect to the first direction DR1 and / or the second direction DR2. The negative C-plate 122 provides a phase difference of about 18 nm as an Rth (out-of-plane retardation) value to the transmitted light, and has an Ro (in-plane retardation) value close to about 0.

[0229] Further, in Embodiment 3, the negative A-plate 113 provides a phase difference of about -177.6 nm as an Ro (in-plane retardation) value to the transmitted light, and the retardation axis (113-ds; slow axis) of the liquid crystal molecules 113-lq included in the negative A-plate 113 has an angle of about -31 degrees with respect to the first direction DR1.

[0230] In Embodiment 3, the positive A-plate 112 provides a phase difference of about 163.5 nm as an Ro (in-plane retardation) value to the transmitted light, the orientation angle 112-da (bottom tilt) of the liquid crystal molecules 112-lq of the positive A-plate 112 has an angle of about 50 degrees with respect to the first direction DR1, and the tilt angle 112-dt (top tilt) has an angle of about -31 degrees with respect to the first direction DR1.

[0231] In Embodiment 3, the positive C-plate 111 provides a phase difference of about -76 nm as an Rth (out-of-plane retardation) value to the transmitted light.

[0232] Referring to Figure 28 ​In Embodiment 4, the polarizing layer 121 has an absorption axis having an angle of about 45 degrees with respect to the first direction DR1 and / or the second direction DR2, and the negative C-plate provides a phase difference of about 45 nm to the transmitted light as an Rth (out-of-plane retardation) value, and has an Ro (in-plane retardation) value close to about 0.

[0233] In the embodiment, the negative A-plate 113 provides a phase difference of about -177.6 nm to the transmitted light as an Ro (in-plane retardation) value, and a retardation axis 113-ds of the liquid crystal molecules 113-lq included in the negative A-plate 113 has an angle of about -31 degrees with respect to the first direction DR1.

[0234] In the embodiment, the positive A-plate 112 provides a phase difference of about 163.5 nm to the transmitted light as an Ro (in-plane retardation) value, and an orientation angle 112-da of the liquid crystal molecules 112-lq of the positive A-plate 112 is an angle of about 50 degrees with respect to the first direction DR1, and a tilt angle 112-dt is an angle of about -31 degrees with respect to the first direction DR1.

[0235] In the embodiment, the positive C-plate 111 provides a phase difference of about -76 nm to the transmitted light as an Rth (out-of-plane retardation) value.

[0236] In the embodiment, with reference to Figure 28 , the difference between Embodiment 3 and Embodiment 4 is only the Rth (out-of-plane retardation) value provided by the negative C-plate 122, and the remaining optical layers and the polarizing layer have the same set of characteristics.

[0237] In the embodiment, with reference to Figure 29 It can be seen that Embodiments 3 and 4 have lower reflectance than Comparative Examples 1 and 2, and there is little difference in the overall reflection color characteristics.

[0238] Embodiments 3 and 4 have values lower than about 10% even in the portion where the front reflectance has a maximum value, and in the comparative examples, many portions have a front reflectance exceeding about 10%.

[0239] It can be confirmed that the feature of the embodiments is that the front reflectance has a value of about 10% or less.

[0240] In the embodiment, in Figure 30 , reflectance characteristics of other embodiments as well as Comparative Examples 1 and 2 are shown.

[0241] Figure 30 is a graph showing the reflection characteristics of the comparative examples and various embodiments.

[0242] Figure 30The reflective properties of Embodiments 5-9 are shown, which are similar to Embodiments 1-4 described above, but with slight variations in the retardation values provided by the individual optical layers.

[0243] The retardation values provided in Embodiments 5-9 are as follows, and the angles of the optical layers are the same as the angles of the optical layers of Embodiments 1-4.

[0244] In Embodiment 5, the negative C-plate 122 provides a phase difference of about 41.4 nm to the transmitted light as an Rth (out-of-plane retardation) value, the negative A-plate 113 provides a phase difference of about -177.5 nm to the transmitted light as an Ro (in-plane retardation) value, the positive A-plate 112 provides a phase difference of about 163.5 nm to the transmitted light as an Ro (in-plane retardation) value, and the positive C-plate 111 provides a phase difference of about -77.5 nm to the transmitted light as an Rth (out-of-plane retardation) value.

[0245] In Embodiment 6, the negative C-plate 122 provides a phase difference of about 41.4 nm to the transmitted light as an Rth (out-of-plane retardation) value, the negative A-plate 113 provides a phase difference of about -177.5 nm to the transmitted light as an Ro (in-plane retardation) value, the positive A-plate 112 provides a phase difference of about 163.5 nm to the transmitted light as an Ro (in-plane retardation) value, and the positive C-plate 111 provides a phase difference of about -70 nm to the transmitted light as an Rth (out-of-plane retardation) value.

[0246] In Embodiment 7, the negative C-plate 122 provides a phase difference of about 18 nm to the transmitted light as an Rth (out-of-plane retardation) value, and the negative A-plate 113 provides a phase difference of about -177.5 nm to the transmitted light as an Ro (in-plane retardation) value, the positive A-plate 112 provides a phase difference of about 163.5 nm to the transmitted light as an Ro (in-plane retardation) value, and the positive C-plate 111 provides a phase difference of about -70 nm to the transmitted light as an Rth (out-of-plane retardation) value.

[0247] In Embodiment 8, the negative C-plate 122 provides a phase difference of about 13.2 nm to the transmitted light as an Rth (out-of-plane retardation) value, the negative A-plate 113 provides a phase difference of about -177.5 nm to the transmitted light as an Ro (in-plane retardation) value, the positive A-plate 112 provides a phase difference of about 163.5 nm to the transmitted light as an Ro (in-plane retardation) value, and the positive C-plate 111 provides a phase difference of about -76 nm to the transmitted light as an Rth (out-of-plane retardation) value.

[0248] In Embodiment 9, the negative C plate 122 provides a phase difference of about 22.7 nm to the transmitted light as an Rth (out-of-plane retardation) value, the negative A plate 113 provides a phase difference of about -177.5 nm to the transmitted light as an Ro (in-plane retardation) value, the positive A plate 112 provides a phase difference of about 163.5 nm to the transmitted light as an Ro (in-plane retardation) value, and the positive C plate 111 provides a phase difference of about -70 nm to the transmitted light as an Rth (out-of-plane retardation) value.

[0249] Referring to Figure 30 It can be seen that the embodiment is characterized in that the front reflectance has a value of about 10% or less.

[0250] In the embodiment, the negative C plate 122 disposed below the polarizing layer 121 can be formed in a film form, and can be attached to the lower portion of the polarizing layer 121.

[0251] Meanwhile, in some embodiments, the positive C plate 111, the positive A plate 112, and the negative A plate 113 included in the optical layer can be formed by arranging liquid crystal molecules included in each of them in a certain direction.

[0252] However, the present application is not limited to these embodiments.

[0253] In the embodiment, the method of forming a film having a phase difference includes forming a material constituting a film into a film and stretching it in a certain direction to have a phase difference in the certain direction.

[0254] According to the embodiment, a method of generating a phase difference in a film form is shown in detail. Figure 31

[0255] Figure 31 is a graph showing various optical properties of a film according to the embodiment according to stretching.

[0256] In the embodiment, referring to Figure 31 , it is shown that, for a film material having the same length (L0), by continuously changing the length (L x , L y , L z ) of each axis, the optical properties are determined by the magnitude of the refractive index (n x , n y , n z ).

[0257] In the embodiment, there can be various methods of providing a phase difference by aligning liquid crystal molecules, and there are two main methods: a rubbing method of arranging liquid crystal molecules in a rubbing direction and a photo-alignment method of using light to align liquid crystal molecules in a certain direction.

[0258] ​In an embodiment, the rubbing method can be simple because liquid crystal molecules can be aligned in the direction of rubbing, and in another embodiment, there are various photo-alignment methods as shown in Figure 32

[0259] Figure 32 FIG. 1 is a diagram illustrating various examples of photo-alignment according to an embodiment.

[0260] In an embodiment, referring to Figure 32 , a photo-alignment method can be broadly classified into a photo-isomerization method, a photo-degradation method, a photo-polymerization method, and a photo-curing method.

[0261] In an embodiment, the photo-isomerization method can use an azo compound, and when irradiated with polarized ultraviolet (UV) light, the ionomer changes from a cis molecular structure to a trans molecular structure, and as it changes, the liquid crystal molecules are aligned accordingly.

[0262] In an embodiment, the photo-degradation method can also be referred to as a photo-oxidation method, and using polarized ultraviolet (UV) light to cut the polyimide chain, so that the liquid crystal molecules can be aligned in a specific direction.

[0263] In an embodiment, the photo-polymerization method can use a material capable of photo-dimerization, and using polarized ultraviolet (UV) cinnamate as a side chain to connect them to each other, and the main chain is photo-polymerized to be sensitive to ultraviolet light, so that the liquid crystal molecules can be aligned accordingly.

[0264] In an embodiment, the photo-curing method uses polarized ultraviolet (UV) light to thermally cure liquid crystal molecules, so that the liquid crystal molecules are oriented in a specific direction, and materials with cross-linking (cycloaddition) can be used, materials containing cinnamate moieties that react and bind with UV and positive charge (cationic) moieties that react and bind with heat can be used.

[0265] In an embodiment, liquid crystal molecules can be oriented in a specific direction by photo-reaction and thermal curing.

[0266] In an embodiment, among the liquid crystal molecules included in the optical layer, certain liquid crystal molecules can have a rod shape, and hereinafter, various examples of rod-shaped liquid crystal molecules will be discussed using Figure 33

[0267] Figure 33 FIG. 2 is a diagram illustrating various examples of rod structure liquid crystal molecules according to an embodiment.

[0268] In an embodiment, the rod-shaped liquid crystal molecules can have different refractive indices depending on the direction, can have a chemical structure as described in the second row, and one of the materials provided in the third to sixth rows can be used.

[0269] ​​In an embodiment, when the rod-shaped liquid crystal molecules are classified based on their chemical formula, they include a central group including an aromatic compound and a linking group connecting them, and a terminal group and a T group on both sides of the central group.

[0270] In an embodiment, in Figure 33 Examples of compounds that can be placed in each group are shown in Table 1.

[0271] In an embodiment, the length and / or viscosity properties of the rod-shaped liquid crystal molecules are related to the terminal group and / or the linking group, the refractive index and the refractive index anisotropy properties are related to the central group, and the polarity affecting the crystal phase can be related to the T group.

[0272] Specifically, according to the embodiment, in wavelength dispersion, the short wavelength refractive index tends to increase according to the content of the central group, and the wavelength dispersion characteristics can be adjusted according to the ratio of the central group to the terminal group.

[0273] Although the embodiments have been described in detail above, the scope of the utility model is not limited thereto, and those skilled in the art can make various modifications and improvements using the basic concept of the utility model. The embodiments of the utility model disclosed herein and shown in the drawings are provided as specific examples in order to more easily explain the technical content according to the utility model and help understand the embodiments of the utility model, but they are not intended to limit the scope of the utility model. Therefore, the scope of the utility model should be interpreted as including all changes or modifications derived from the technical ideas of various embodiments in addition to the embodiments disclosed herein. Furthermore, embodiments or parts of embodiments can be combined in whole or in part without departing from the scope of the utility model.

Claims

1. A light-emitting display device, characterized by comprising: The light emitting display device includes: a display panel including light emitting diodes; a positive C-plate disposed on a front surface of the display panel; a positive A-plate disposed on a front surface of the positive C-plate; a negative A-plate disposed on a front surface of the positive A-plate; and a polarizer disposed on a front surface of the negative A-plate, wherein the polarizer includes a polarizing layer having an absorption axis and a negative C-plate disposed between the polarizing layer and the negative A-plate, wherein the positive C-plate, the positive A-plate, the negative A-plate, and the negative C-plate each have a positive wavelength dispersion characteristic, and wherein the light emitting display device as a whole has a negative wavelength dispersion characteristic on a front surface. 2.The light emitting display device of claim 1, wherein the light emitting display device has a front surface reflectance of 10% or less with respect to external light. 3.The light emitting display device of claim 2, wherein the positive C-plate, the positive A-plate, and the negative A-plate are formed by aligning liquid crystal molecules, wherein the negative C-plate is in the form of a film and is attached to one side of the polarizing layer. 4.The light emitting display device of claim 3, wherein the positive C-plate has a thickness direction retardation value in a range of -50 nm or more and -85 nm or less, the positive A-plate has an in-plane retardation value in a range of 160 nm or more and 180 nm or less, liquid crystal molecules included in the positive A-plate have a twisted liquid crystal array, the twisted liquid crystal array of the liquid crystal molecules of the positive A-plate has an alignment angle of 50 degrees with respect to a first direction and an inclination angle of -31 degrees with respect to the first direction, the negative A-plate has an in-plane retardation value in a range of -160 nm or more and -180 nm or less, the negative A-plate has a retardation axis having an angle of -31 degrees with respect to the first direction, the negative C-plate has a thickness direction retardation value in a range of 10 nm to 50 nm, and the absorption axis of the polarizing layer has an angle of 45 degrees with respect to the first direction. The light emitting display device includes: a display panel including light emitting diodes; a positive C-plate disposed on a front surface of the display panel; 5. A light emitting display device, characterized by comprising: a positive A-plate disposed on a front surface of the positive C-plate; a negative A-plate disposed on a front surface of the positive A-plate; and a polarizer disposed on a front surface of the negative A-plate, wherein the polarizer includes a polarizing layer having an absorption axis and a negative C-plate disposed between the polarizing layer and the negative A-plate, wherein the positive C-plate has a thickness direction retardation value in a range of -50 nm to -85 nm, the positive A-plate has an in-plane retardation value in a range of 160 nm or more and 180 nm or less, the negative A-plate has an in-plane retardation value in a range of -160 nm to -180 nm, and the negative C-plate has a thickness direction retardation value in a range of 10 nm to 50 nm. 6.The light emitting display device of claim 5, wherein the positive C-plate is formed by aligning liquid crystal molecules. 7.The light emitting display device of claim 5, wherein the positive A-plate has twisted liquid crystal molecules, and ​ ​ ​ ​ ​ wherein the twisted liquid crystal molecules of the positive A-plate have an angle of orientation of 50 degrees with respect to a first direction and an angle of tilt of -31 degrees with respect to the first direction.

8. The light-emitting display device according to claim 5, wherein the negative A-plate is formed by aligning liquid crystal molecules, and wherein the negative A-plate has a retardation axis having an angle of -31 degrees with respect to a first direction.

9. The light-emitting display device according to claim 5, wherein the negative C-plate is in the form of a film and attached to one side of the polarizing layer, and the absorption axis of the polarizing layer has an angle of 45 degrees with respect to a first direction.

10. The light-emitting display device according to claim 5, wherein the positive C-plate, the positive A-plate, the negative A-plate, and the negative C-plate each have a positive wavelength dispersion characteristic, and wherein the light-emitting display device has a negative wavelength dispersion characteristic on a front side of the light-emitting display device.

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