Optical display device module and optical display device comprising the same

Abstract

Provided are an optical display device module and an optical display device including the same, the optical display device module including an optical display device panel and a first polarizing plate disposed on at least one surface of the optical display device panel, wherein the first polarizing plate includes a first polarizing sheet and a first retardation layer disposed between the first polarizing sheet and the optical display device panel, the first retardation layer including at least a positive C layer, the optical display device panel including a second retardation layer therein, and the second retardation layer and the first retardation layer satisfying Formula 1 and Formula 2.

Description

Technical Field

[0001] This invention relates to an optical display module and an optical display device including the same. More particularly, this invention relates to an optical display module that can improve contrast in its lateral direction while suppressing lateral light leakage, and to an optical display device including the optical display module. Background Technology

[0002] Liquid crystal displays (LCDs) operate to allow light emitted from a light source to pass sequentially through a light source-side polarizer, the liquid crystal panel, and a viewer-side polarizer. Because LCDs allow light emitted from a light source to be emitted perpendicularly through the screen in front of it, there are no contrast issues on the front side. However, compared to its front side, an LCD has lower contrast on its sides. Furthermore, LCDs typically suffer from light leakage on their sides.

[0003] On the other hand, IPS-mode liquid crystal displays (LCDs) drive nematic liquid crystals to display images by applying a lateral electric field to these nematic liquid crystals, which are uniformly aligned when no electric field is applied. IPS-mode LCDs offer the advantage of a wider viewing angle compared to other types of LCDs. However, since IPS-mode LCDs require large area and high resolution, a method is needed to suppress lateral light leakage while improving lateral contrast in IPS-mode LCDs.

[0004] The background technology of this invention is disclosed in Korean Patent Registration No. 10-1062696, etc. Summary of the Invention

[0005] Technical issues

[0006] One aspect of the present invention provides an optical display module that can significantly improve lateral contrast while suppressing lateral light leakage, and relates to an optical display device including the optical display module.

[0007] Technical solution

[0008] One aspect of the present invention relates to an optical display module.

[0009] 1. An optical display module, comprising: an optical display panel; and a first polarizing plate disposed on at least one surface of the optical display panel, wherein the first polarizing plate includes a first polarizer and a first retardation layer disposed between the first polarizer and the optical display panel, the first retardation layer including at least a positive C layer; the optical display panel further includes a second retardation layer; and the second retardation layer and the first retardation layer satisfy formulas 1 and 2:

[0010] [Formula 1]

[0011] │Re1 x Rth2│≥8450

[0012] [Formula 2]

[0013] -2.10≤(Re1) / (Rth2)≤-1.20

[0014] (In formulas 1 and 2 above,

[0015] Re1 is the in-plane retardation (in nm) of the second retardation layer at a wavelength of 550 nm, and

[0016] Rth2 is the out-of-plane delay of the first delay layer at a wavelength of 550 nm (unit: nm).

[0017] 2. In 1, the range of |Re1 x Rth2| can be from 8450 to 13000.

[0018] 3. In 1 to 2, the second delay layer can realize a positive A (+A) delay layer.

[0019] 4. In 1 to 3, the range of Re1 can be from about 10 nm to about 150 nm.

[0020] 5. In 1 to 4, the range of Rth2 can be from about -200 nm to less than about 0 nm.

[0021] 6. In 1 to 5, the first polarizing plate can be arranged on the outside of the optical display panel.

[0022] 7. In 1 to 6, the positive C layer can have an out-of-plane delay of about -200 nm to less than about 0 nm at a wavelength of 550 nm.

[0023] 8. In 1 to 7, the positive C layer may be formed from a composition comprising at least one selected from cellulose compounds or polymers thereof and aromatic compounds or polymers thereof.

[0024] 9. In 8, cellulose compounds may include cellulose ester compounds, and aromatic compounds may include polystyrene compounds.

[0025] 10. In 1 to 9, the first delay layer can be a single layer of positive C layer.

[0026] 11. In 1 to 10, the first delay layer may include a positive C layer and a protective layer stacked on at least one surface of the positive C layer.

[0027] 12. In 11, the protective layer can be a negative A, negative B, negative C, or positive B delay layer with uniaxial or biaxial characteristics.

[0028] 13. In 11-12, the protective layer may not contain the positive A layer.

[0029] 14. In 11-13, the protective layer can have an in-plane delay of about 20 nm or less at a wavelength of 550 nm.

[0030] 15. In 1 to 14, the optical display panel may further include a liquid crystal layer.

[0031] 16. In 1 to 15, the first polarizing plate may include a first polarizer, a first retardation layer disposed on one surface of the first polarizer, and a first polarizer protective layer disposed on the other surface of the first polarizer.

[0032] 17. In 1 to 16, the optical display module may include an optical display panel, a first polarizing plate disposed on one surface of the optical display panel, and a second polarizing plate disposed on another surface of the optical display panel.

[0033] Another aspect of the present invention relates to an optical display device.

[0034] The optical display device includes an optical display module according to the present invention.

[0035] Beneficial effects

[0036] The present invention provides an optical display module and an optical display device including the optical display module, which can significantly improve its lateral contrast while suppressing its lateral light leakage. Attached Figure Description

[0037] Figure 1 (a) is a cross-sectional view of the first polarizing plate, and (b) is a cross-sectional view of the second polarizing plate.

[0038] Figure 2 In the table, (a) shows the contrast measurement results of Example 1, (b) shows the contrast measurement results of Example 3, and (c) shows the contrast measurement results of Comparative Example 5. Detailed Implementation

[0039] In the following description, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, enabling those skilled in the art to readily implement the invention. It should be understood that the present invention may be embodied in different ways and is not limited to the following embodiments.

[0040] In the accompanying drawings, components irrelevant to the description are omitted for clarity of the invention, and the same reference numerals will be used to denote the same components throughout the specification. Although the lengths, thicknesses, or widths of various components may be enlarged in the drawings for understanding, the invention is not limited thereto. Spatial relative terms such as “upper” and “lower” are defined herein with reference to the accompanying drawings. Therefore, it is understood that the term “upper surface” may be used interchangeably with the term “lower surface”.

[0041] In this paper, "in-plane delay (Re)," "out-of-plane delay (Rth)," and "biaxiality (NZ)" are represented by equations A, B, and C, respectively:

[0042] [Equation A]

[0043] Re = (nx - ny)xd

[0044] [Equation B]

[0045] Rth=((nx+ny) / 2-nz)xd

[0046] [Equation C]

[0047] NZ = (nx - nz) / (nx - ny)

[0048] (In equations A to C, nx, ny, and nz are the refractive indices of the corresponding optical device in the slow axis, fast axis, and thickness directions, respectively, at a wavelength of 550 nm, and d represents the thickness of the optical device (in nm).

[0049] In this article, lateral refers to ( The region (45°, 60°) or (135°, 60°) in the spherical coordinate system (where the front is represented by (0°, 0°) relative to the horizontal direction, the left endpoint by (180°, 90°) and the right endpoint by (0°, 90°)) is θ.

[0050] As used in this article to indicate a specific range of values, the expression "X to Y" means "greater than or equal to X and less than or equal to Y (X ≤ and ≤ Y)".

[0051] The optical display module according to the invention enables a significant reduction in lateral brightness in black mode, thereby ensuring a significant improvement in lateral contrast while suppressing lateral light leakage. When the optical display module provides the same brightness in white mode, lower brightness in black mode indicates a further improvement in lateral contrast (the ratio of brightness in white mode to brightness in black mode). Specifically, the optical display module according to the invention significantly reduces lateral brightness in black mode in terms of lateral contrast ((…)). θ), especially (45°, 60°) or (135°, 60°), can have less than 0.6 cd / m 2 The brightness.

[0052] The optical display module according to the present invention includes an optical display panel and a first polarizing plate disposed on at least one surface of the optical display panel.

[0053] The first polarizing plate includes a first polarizer; and a first retardation layer disposed between the first polarizer and the optical display panel. The first retardation layer includes at least a positive C layer. The optical display panel includes a second retardation layer therein. The second retardation layer and the first retardation layer satisfy Equations 1 and 2.

[0054] In one embodiment, the first polarizing plate can be arranged outside the optical display panel and placed on the light emitting surface of the optical display panel, thereby acting as a viewer-side polarizing plate.

[0055] Next, we will refer to Figure 1 An optical display module according to an embodiment of the present invention is described.

[0056] See Figure 1 The optical display module may include a first polarizing plate (see...) Figure 1 (a)) and the second polarizing plate (see Figure 1 (b)). The optical display module may further include an optical display panel stacked between a first polarizing plate and a second polarizing plate. The first polarizing plate may be disposed on one surface of the optical display panel and the second polarizing plate may be disposed on the other surface of the optical display panel.

[0057] In one embodiment, a first polarizing plate may be disposed on the light emitting surface of the optical display panel, and a second polarizing plate may be disposed on the light incident surface of the optical display panel.

[0058] The first polarizing plate includes a first polarizer (110) and a first retardation layer (210) stacked on the lower surface of the first polarizer (110) (the light incident surface of the first polarizer). The first retardation layer (210) includes at least a positive C layer. The first retardation layer (210) is disposed between the first polarizer (110) and the optical display panel.

[0059] The optical display panel includes a second delay layer therein.

[0060] The second delay layer and the first delay layer (210) satisfy the following formulas 1 and 2. With this structure, the optical display module enables a significant reduction in lateral brightness in black mode, thereby ensuring a significant improvement in lateral contrast while suppressing lateral light leakage.

[0061] [Formula 1]

[0062] │Re1 x Rth2│≥8450

[0063] [Formula 2]

[0064] -2.10≤(Re1) / (Rth2)≤-1.20

[0065] (In formulas 1 and 2,

[0066] Re1 represents the in-plane delay (in nm) of the second retardation layer at a wavelength of 550 nm, and

[0067] Rth2 is the out-of-plane delay of the first delay layer at a wavelength of 550nm (unit: nm).

[0068] In Formula 1, |Re1 x Rth2| is a unitless value.

[0069] According to this embodiment, an optical display module is formed to satisfy Equations 1 and 2 between the phase delay of the first delay layer and the phase delay of the second delay layer. The first delay layer is disposed outside the optical display panel and placed between the optical display panel and the first polarizer. The second delay layer is disposed inside the optical display panel. The first delay layer includes at least a positive C layer to achieve the aforementioned effects of the present invention.

[0070] When at least a positive C layer is disposed between the optical display panel and the first polarizer, Equations 1 and 2 become reference formulas for determining whether the optical display module can achieve improved lateral contrast while suppressing lateral light leakage. Typically, by controlling the phase retardation of only the first retardation layer disposed between the first polarizer and the optical display panel, the optical display module can achieve improved contrast. On the other hand, the present invention was developed considering the relationship between the first retardation layer and the second retardation layer disposed inside the optical display panel. When either Equation 1 or 2 is not satisfied, the improvement in lateral contrast and suppression of lateral light leakage achievable by the optical display module are not significant. However, even when the second retardation layer is formed outside the optical display panel and disposed between the first retardation layer and the optical display panel, the optical display module can still achieve significant improvement in lateral contrast and suppression of lateral light leakage.

[0071] In one implementation, for example, |Re1 x Rth2| in Formula 1 can be about 8450 or greater, such as 8450, 8500, 8600, 8700, 8800, 8900, 9000, 9100, 9200, 9300, 9400, 9500, 9600, 9700, 9800, 9900, 10000, 10100, 10200, 10300, 10400, 10500, 10600, 10700, 10800, 10900, 11000, 11100, 11 The range of 200, 11300, 11400, 11500, 11600, 11700, 11800, 11900, 12000, 12100, 12200, 12300, 12400, 12500, 12600, 12700, 12800, 12900, or 13000, specifically 8450 to 13000, more specifically 8400 to 12000, 8450 to 10100, 8500 to 10100, or 8500 to 9000. Within this range, the optical display module can achieve the above-mentioned effects and allows for easy fabrication of the first retardation layer, the second retardation layer, and the optical display panel.

[0072] In one implementation, for example, (Re1) / (Rth2) (the ratio of Re1 to Rth2) in Formula 2 can be -2.10, -2.00, -1.90, -1.80, -1.70, -1.60, -1.50, -1.40, -1.30, or -1.20, specifically -2.075 to -1.3, and more specifically -1.6 to -1.3. Within this range, the optical display module can achieve the above-described effects while allowing for easy fabrication of the first retardation layer, the second retardation layer, and the optical display panel.

[0073] By adjusting the delay values ​​of the first and second delay layers, the first and second delay layers can satisfy formulas 1 and 2.

[0074] Optical display panel

[0075] The optical display panel has different liquid crystal orientations depending on the applied voltage and can allow the emission of light from a light source.

[0076] The optical display panel may include an image display medium.

[0077] In one embodiment, the optical display panel may include a liquid crystal layer disposed therein as an image display medium. However, it should be understood that the invention is not limited thereto. The liquid crystal layer may include horizontally aligned liquid crystal, such as in-plane switching (IPS) or edge field switching (FFS) liquid crystal. Therefore, the optical display device can achieve improved color reproduction and field of view.

[0078] An optical display panel may include a second delay layer therein.

[0079] At a wavelength of 550 nm, the second retardation layer can have an in-plane retardation Re1 of about 10 nm to about 150 nm, for example, about 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140 or 150 nm, specifically about 30 nm to about 145 nm, and more specifically about 50 nm to about 130 nm. Within this range, the optical display panel can easily satisfy Formulas 1 and 2, ensuring a reduction in the thickness of the optical display panel and facilitating its fabrication.

[0080] The second retardation layer can realize a positive A(+A) retardation layer (nx>ny≒nz, where nx, ny, and nz are the refractive indices of the second retardation layer in the slow axis, fast axis, and thickness direction, respectively, at a wavelength of 550nm).

[0081] In this invention, the second retardation layer of the optical display panel achieves positive A-retardation, and its first retardation layer includes at least a positive C-layer. With this structure, the optical display module can easily achieve the effects of this invention and eliminates the need for a positive A-retardation layer for the viewer-side polarizer, thereby ensuring a reduction in the thickness of the optical display device and facilitating the manufacture of the first polarizer via a roll-to-roll process. In one embodiment, the polarizer may not include a positive A-retardation layer.

[0082] Although the second retardation layer can be formed from a non-liquid crystal composition, it is preferably formed by depositing a liquid crystal composition onto the lower surface of a first substrate of the optical display panel, considering that a liquid crystal layer can be formed inside the optical display panel, and then curing the liquid crystal composition. For example, the second retardation layer can be formed by forming an alignment layer on the lower surface of the first substrate and depositing the liquid crystal composition on the alignment layer, followed by curing the liquid crystal composition. The liquid crystal composition may contain typical liquid crystal materials known to those skilled in the art that are capable of achieving the aforementioned in-plane retardation Re1 and positive A retardation. The phase retardation of the second retardation layer can be adjusted by controlling the type of liquid crystal composition to be used, the coating thickness, the curing conditions, etc.

[0083] An optical display panel may include at least one substrate to facilitate the inclusion of an image display medium and a second delay layer within the optical display panel. However, it should be understood that the invention is not limited thereto.

[0084] In one embodiment, the optical display panel may include a pair of substrates facing each other, namely a first substrate and a second substrate. The space within the optical display panel (e.g., the space separated by the first substrate and the second substrate) may include an image display medium and a second delay layer.

[0085] The first substrate is a color filter substrate and may be provided with a color filter and a black matrix. The second substrate is an active matrix substrate and may be provided with switching elements (e.g., TFTs) for controlling the electrical and optical characteristics of the image display medium, as well as signal lines and pixel lines for providing gate signals to the switching elements. However, it should be understood that the first and second substrates are not limited thereto.

[0086] The optical display panel can have a thickness greater than about 0 mm to about 10 mm, specifically about 5 mm to 10 mm. Within this range, the optical display panel can be applied to an optical display device.

[0087] First polarizing plate and second polarizing plate

[0088] refer to Figure 1 The first polarizing plate may include a first polarizer (110), a first polarizer protective layer (310) stacked on the upper surface (light emitting surface) of the first polarizer (110), and a first retardation layer (210) stacked on the lower surface (light incident surface) of the first polarizer (110). The second polarizing plate may include a second polarizer (120), a second polarizer protective layer (320) stacked on the upper surface (light emitting surface) of the second polarizer (120), and a third polarizer protective layer (330) stacked on the lower surface (light incident surface) of the second polarizer (120).

[0089] In one embodiment, each of the first polarizing plate and the second polarizing plate can be arranged outside the optical display panel. The first polarizing plate can be used as a viewer-side polarizing plate and the second polarizing plate can be used as a light source-side polarizing plate.

[0090] Each of the first and second polarizing plates can be stacked on the optical display panel via an adhesive layer. This adhesive layer can be formed using typical adhesives known to those skilled in the art, such as water-based adhesives or photocurable adhesives, but is not limited thereto.

[0091] First Delay Layer

[0092] A first delay layer (210) is disposed on one surface of the optical display panel and emits light received from the optical display panel toward the first polarizer (110). The first delay layer (210) is formed on the outer side of the optical display panel.

[0093] The first delay layer (210) includes at least a positive C (+C) layer.

[0094] A positive C layer represents a layer exhibiting positive uniaxial properties with substantially the same nx and ny values ​​and having an optical axis in the normal direction. A positive C layer is a retardation layer with the relationship nz > nx ≒ ny (nx, ny, and nz are the refractive indices of the positive C layer in its slow axis, fast axis, and thickness direction, respectively, at a wavelength of 550 nm).

[0095] At a wavelength of 550 nm, the positive C layer can have an out-of-plane retardation Rth3 from -200 nm to less than 0 nm, for example, about -200, -190, -180, -170, -160, -150, -140, -130, -120, -110, -100, -90, -80, -70, -60, -50, -40, -30, -20, -10, -5, or -0.1 nm, specifically about -180 nm to about -5 nm, and more specifically about -150 nm to about -30 nm. Within this range, the first and second retardation layers can satisfy Equations 1 and 2 and can be readily formed into a positive C layer.

[0096] At a wavelength of 550 nm, the positive C layer can have an in-plane retardation Re3 of about 20 nm or less, for example, about 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 nm, specifically about 0 nm to about 20 nm, and more specifically about 0 nm to about 10 nm. Within this range, the positive C layer can easily achieve the target out-of-plane retardation Rth2.

[0097] The thickness of the positive C layer can be from about 0.001 μm to about 100 μm, specifically from about 0.001 μm to about 50 μm. Within this range, the positive C layer can be used in polarizing plates.

[0098] The positive C layer can be formed from any material and can have any shape, as long as the positive C layer can exhibit optical characteristics.

[0099] In one embodiment, the positive C layer can be a polymer film or resin film formed from a polymer and exhibiting birefringence. In this case, the phase retardation of the positive C layer can be achieved by controlling the refractive index, elongation, and thickness of the polymer or resin film.

[0100] A birefringent polymer film can be produced, but is not limited to, by stretching an unstretched film bonded to a support film in the thickness direction of the unstretched film for the positive C layer. Alternatively, a birefringent polymer film may include a film prepared by stretching an unstretched film containing a retarding agent to achieve phase retardation in the thickness direction.

[0101] In another embodiment, the positive C layer can be a liquid crystal layer formed by depositing or transferring a low-molecular-weight or high-molecular-weight liquid crystal compound onto a transparent support. In this case, the phase retardation of the positive C layer can be achieved by controlling the thickness of the liquid crystal layer, the refractive index of the components constituting the liquid crystal layer, and so on.

[0102] Liquid crystal layers formed from liquid crystal compounds can include layers formed by fixing the liquid crystal after vertically aligning a cholesterol disc-shaped liquid crystal compound or a composition including the same, or layers formed by fixing the liquid crystal after vertically aligning a rod-shaped liquid crystal compound having a positive refractive index and birefringence or a composition including the same. Depending on the temperature range for alignment, the rod-shaped liquid crystal compound can be a nematic liquid crystal, a smectic liquid crystal, a lyotropic liquid crystal, etc. The composition may further include a polymerization initiator, a vertical alignment agent, and conventional additives. The liquid crystal layer formed from the liquid crystal compound can have a thickness of about 0.001 μm to about 10 μm (specifically about 0.05 μm to about 1.5 μm).

[0103] In another embodiment, the positive C layer can be a coating formed by coating a low-molecular-weight or high-molecular-weight non-liquid crystal compound or a composition containing the same onto a transparent support and then curing it. In this case, the phase retardation of the positive C layer can be achieved by controlling the thickness of the coating, the refractive index of the components constituting the coating, the solvent included in the coating composition, the curing conditions (including the curing temperature), etc.

[0104] The low or high molecular weight non-liquid crystal compound used for coatings formed from non-liquid crystal compounds is an amorphous compound and is not limited to a specific compound, as long as the coating can achieve the above-mentioned out-of-plane retardation.

[0105] In one embodiment, the low- or high-molecular-weight non-liquid crystal polymer can be formed from a composition containing a cellulose compound or a polymer thereof and / or an aromatic compound or a polymer thereof. Specifically, the positive C layer can contain a cellulose ester compound or a polymer thereof and / or an aromatic compound or a polymer thereof. Cellulose ester compounds or polymers thereof and aromatic compounds or polymers thereof can be suitable for forming the positive C layer according to the invention.

[0106] Cellulose ester compounds may include at least one selected from cellulose ester resins, cellulose ester oligomers and cellulose ester monomers.

[0107] Cellulose esters may include condensation products obtained by the reaction of hydroxyl groups on cellulose compounds with carboxylic acids or carboxylic anhydrides.

[0108] Cellulose esters can be regioselectively or randomly substituted. Regioselectivity can be measured by determining the relative degree of substitution at the C6, C3, and C2 positions on the cellulose ester using carbon-13 NMR. Typical methods can be used by reacting a cellulose solution with at least one C1 to C2 position. 20 The acylating agent is contacted for a sufficient contact time to provide cellulose esters with the desired degree of substitution and polymerization, thereby preparing cellulose ester compounds.

[0109] Preferably, the acylating agent comprises at least one straight-chain or branched C1 to C2 chain. 20 Alkyl or aryl carboxylic anhydrides, carboxylic acid halides (acyl halides), diketones, or acetoacetates. Examples of carboxylic anhydrides include acetic anhydride, propionic anhydride, butyric anhydride, isobutyric anhydride, valeric anhydride, hexanoic anhydride, 2-ethylhexanoic anhydride, nonanoic anhydride, lauric anhydride, palmitic anhydride, stearic anhydride, benzoic anhydride, substituted benzoic anhydride, phthalic anhydride, and isophthalic anhydride. Examples of carboxylic acid halides include acetyl chloride, propionyl chloride, butyryl chloride, hexanoyl chloride, 2-ethylhexanoyl chloride, lauroyl chloride, palmitoyl chloride, benzoyl chloride, substituted benzoyl chloride, and stearoyl chloride. Examples of acetoacetates include methyl acetoacetate, ethyl acetoacetate, propyl acetoacetate, butyl acetoacetate, and tert-butyl acetoacetate. Most preferably, the acylating agent includes straight-chain or branched C2 to C9 alkyl carboxylic anhydrides, such as acetic anhydride, propionic anhydride, butyric anhydride, 2-ethylhexanoic anhydride, nonanoic anhydride, and stearic anhydride.

[0110] Preferably, for example, the cellulose ester compounds include, but are not limited to, cellulose acetate (CA), cellulose propionate (CAP), and cellulose acetate butyrate (CAB).

[0111] In one embodiment, the cellulose ester compound may include at least two acyl substituents. At least one of the acyl groups may include an aromatic substituent, and in the cellulose ester compound, the relative degree of substitution (RDS) may be set in the order C6>C2>C3. C6 represents the degree of substitution at the 6th carbon position in the cellulose ester compound, C2 represents the degree of substitution at the 2nd carbon position in the cellulose ester compound, and C3 represents the degree of substitution at the 3rd carbon position in the cellulose ester compound. The aromatic compound may include a benzoate or a substituted benzoate.

[0112] In another embodiment, the cellulose ester compound may include a regioselectively substituted cellulose ester compound having the following substituents (a) and (b):

[0113] (a) Multiple chromophore-acyl substituents; and

[0114] (b) Multiple neopentanoyl substituents.

[0115] Cellulose esters may have a hydroxyl substitution degree of about 0.1 to about 1.2 and a chromophore-acyl substitution degree of about 0.4 to about 1.6; the difference between the chromophore-acyl substitution degree on carbon 2, carbon 3, and carbon 6 of the cellulose ester compound may be about 0.1 to about 1.6; and the chromophore-acyl group may be selected from (i), (ii), (iii), and (iv):

[0116] (i)(C 6-20 ) aryl-acyl, wherein the aryl group is unsubstituted or surrounded by 1 to 5 R groups 1 Replacement

[0117] (ii) a heteroaryl group, wherein the heteroaryl group is a five- to ten-membered ring having one to four heteroatoms selected from N, O, and S, and is unsubstituted or surrounded by one to five R atoms. 1 Replacement;

[0118] (iii)

[0119] The aryl group is C. 1-6 Aryl,

[0120] The aryl group is unsubstituted or surrounded by 1 to 5 R groups. 1 Replacement;

[0121] (iv)

[0122] The heteroaryl group is a five- to ten-membered ring having one to four heteroatoms selected from N, O, and S, and is either unsubstituted or surrounded by one to five R atoms. 1 Replacement;

[0123] R 1 Each is independently a nitro group, a cyano group, or (C 1-6 alkyl, halogenated (C 1-6 )alkyl, (C 6-20 )aryl-CO2-,(C 6-20 )Aryl, (C 1-6 )alkoxy, halogen (C 1-6 )alkoxy, halogen, five to ten heteroaryl groups having one to four heteroatoms selected from N, O and S, or

[0124] In one embodiment, the chromophore-acyl group can be an unsubstituted or substituted benzoyl group or an unsubstituted or substituted naphthyl group.

[0125] In one embodiment, the chromophore-acyl group can be selected from the group consisting of:

[0126]

[0127]

[0128]

[0129] The asterisk (*) refers to the binding site between the chromophore-acyl substituent and the oxygen in the cellulose ester compound.

[0130] In another embodiment, the cellulose ester compound may include an ester polymer having acyl units, wherein at least some of the hydroxyl groups [C2 hydroxyl, C3 hydroxyl, or C6 hydroxyl] of the sugar monomer constituting cellulose may be unsubstituted or substituted, as shown in Formula 1.

[0131] [Chemical Formula 1]

[0132]

[0133] (where n is an integer of 1 or greater).

[0134] The substituents of the cellulose ester polymer or acyl unit may include at least one selected from: halogen, nitro, alkyl (e.g., C1 to C1). 20 Alkyl), alkenyl (e.g., C2 to C3) 20 alkenyl), cycloalkyl (e.g., C3 to C4) 10 cycloalkyl), aryl (e.g., C6 to C4) 20 aryl), heteroaryl (e.g., C3 to C4), 10 aryl), alkoxy (e.g., C1 to C1) 20 It has alkoxy, acyl, and halogen-containing functional groups. Substituents can be the same as or different from each other.

[0135] In this document, as is known in the art, "acyl" may refer to RC (=O)-* (* is the linking site, R is C1 to C2). 20 Alkyl, C3 to C 20 cycloalkyl, C6 to C 20 Aryl or C7 to C 20 Arylalkyl). The "acyl" group is attached to the cellulose ring via an ester bond (through an oxygen atom) in cellulose.

[0136] Here, for convenience, "alkyl," "alkenyl," "cycloalkyl," "aryl," "heteroaryl," "alkoxy," and "acyl" refer to non-halogenated compounds. The composition used for the second delay layer may comprise a single cellulose ester polymer or a mixture comprising cellulose ester polymers.

[0137] Here, "halogen" refers to fluorine (F), Cl, Br or I, with F being preferred.

[0138] A "halogen-containing functional group" is an organic functional group containing at least one halogen and may include aromatic, aliphatic, or alicyclic functional groups. For example, a halogen-containing functional group may refer to halogen-substituted C1 to C2 groups. 20 Alkyl or halogen-substituted C2 to C 20 Alkenyl or halogen-substituted C2 to C 20 Alkyne, halogen-substituted C3 to C 10 Cycloalkyl, halogen-substituted C1 to C 20 Alkoxy groups, halogen-substituted acyl groups, and halogen-substituted C6 to C6 groups 20 Aryl or halogen-substituted C7 to C 20 Arylalkyl groups, but not limited to them.

[0139] "Halogen-substituted acyl group" can be R'-C(=O)-* (* is the linkage site, R' is the C1 to C2 of the halogen-substituted group). 20 Alkyl or halogen-substituted C3 to C4 20 Cycloalkyl, halogen-substituted C6 to C 20 Aryl or halogen-substituted C7 to C 20 Arylalkyl). "Halogen-substituted acyl groups" can be attached to the cellulose ring via ester bonds (through oxygen atoms) in cellulose.

[0140] Preferably, the composition may include cellulose ester polymers substituted with acyl, halogen, or halogen-containing functional groups. More preferably, the halogen is fluorine.

[0141] To form the positive C layer, cellulose ester polymers can be prepared by typical methods known to those skilled in the art, or can be obtained from commercially available products. For example, cellulose ester polymers having acyl groups as substituents can be prepared by reacting trifluoroacetic acid or trifluoroacetic anhydride with a sugar monomer or polymer of a sugar monomer representing formula 1 that constitutes cellulose, by reacting trifluoroacetic acid or trifluoroacetic anhydride with it followed by additionally reacting it with an acylating agent (e.g., an anhydride of a carboxylic acid or a carboxylic acid), or by reacting trifluoroacetic acid or trifluoroacetic anhydride with an acylating agent simultaneously.

[0142] Aromatic compounds include phenyl groups and may include, but are not limited to, polystyrene compounds, fluorobenzenes, or difluorobenzenes. In one embodiment, the polystyrene compound may include the portion represented by chemical formula 2:

[0143] [Chemical Formula 2]

[0144]

[0145] (In chemical formula 2, These are the connection sites of atoms.

[0146] R 1 R 2 and R 3 Each is independently a hydrogen atom, an unsubstituted alkyl group, a substituted alkyl group, or a halogen;

[0147] R are each an independent substituent on the styrene ring; and

[0148] n is an integer from 0 to 5, representing the number of substituents on the styrene ring.

[0149] Examples of substituents R on the styrene ring may include alkyl, substituted alkyl, halogen, hydroxyl, carboxyl, nitro, alkoxy, amino, sulfonate, phosphate, acyl, acyloxy, phenyl, alkoxycarbonyl, and cyano. A substituted alkyl refers to an alkyl group that has been substituted by one of the above substituents.

[0150] Part 2 of the chemical formula may contain halogens.

[0151] In one implementation, R 1 R 2 and R 3 At least one of them can be hydrogen or halogen, preferably hydrogen or fluorine.

[0152] The coating formed from the non-liquid crystal compound can have a thickness of about 0.1 μm to about 50 μm (specifically about 0.5 μm to about 30 μm, more specifically about 3 μm to about 25 μm).

[0153] In one embodiment, the first retardation layer may be a single retardation layer. This single retardation layer is a positive C-layer, and only this positive C-layer can be arranged as the retardation layer between the first polarizer and the optical display panel. To laminate the positive C-layer onto the optical display panel, adhesive layers, bonding layers, or adhesive / bonding layers may be further added, as long as these layers do not provide phase retardation or provide insignificant phase retardation that does not affect the achievement of the effects of the present invention.

[0154] In this case, a positive C layer can be formed by transferring a liquid crystal layer or coating formed on a release film or transparent support onto a first polarizer, or by coating the aforementioned composition onto a first polarizer and then curing the composition.

[0155] At a wavelength of 550 nm, the first retardation layer (i.e., the positive C layer) can have an out-of-plane retardation Rth2 of about -200 nm to less than about 0 nm, for example, about -200, -190, -180, -170, -160, -150, -140, -130, -120, -110, -100, -90, -80, -70, -60, -50, -40, -30, -20, -10, -5, or -0.1 nm, specifically about -180 nm to about -5 nm, and more specifically about -150 nm to about -30 nm. Within this range, the first retardation layer can readily satisfy Equations 1 and 2, and the positive C layer can be readily fabricated. At a wavelength of 550 nm, the first retardation layer (i.e., the positive C layer) can have an in-plane retardation Re2 of about 20 nm or less, for example, about 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 nm, specifically about 0 nm to about 20 nm, and more specifically about 0 nm to about 10 nm. Within this range, the first retardation layer can easily achieve an out-of-plane retardation Rth2.

[0156] In another embodiment, the retardation layer may be a retardation layer laminate comprising at least two layers. The retardation layer laminate includes at least a positive C layer that can be disposed between the first polarizer and the optical display panel. In this case, the retardation layer laminate and the optical display panel simultaneously satisfy Equations 1 and 2, thereby improving lateral contrast while suppressing lateral light leakage.

[0157] For example, a delayed-layer laminate may include a positive C layer and a protective layer stacked on at least one surface of the positive C layer.

[0158] At a wavelength of 550 nm, the retardation layer laminate can have an out-of-plane retardation Rth2 of about -200 nm to less than about 0 nm, for example, about -200, -190, -180, -170, -160, -150, -140, -130, -120, -110, -100, -90, -80, -70, -60, -50, -40, -30, -20, -10, -5, -0.1 nm, specifically about -180 nm to about -5 nm, and more specifically about -150 nm to about -30 nm. Within this range, the retardation layer laminate can readily achieve Equations 1 and 2 and allows for the easy formation of positive C layers.

[0159] At a wavelength of 550 nm, retardation layer laminates can have an in-plane retardation Re2 of about 20 nm or less, for example, about 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 nm, specifically about 0 nm to about 20 nm, and more specifically about 0 nm to about 10 nm. Within this range, retardation layer laminates can readily achieve an out-of-plane retardation Rth2.

[0160] In one embodiment, the delayed layer laminate may include a positive C layer and a protective layer stacked on the upper surface of the positive C layer. In another embodiment, the delayed layer laminate may include a positive C layer and a protective layer stacked on the lower surface of the positive C layer. In yet another embodiment, the delayed layer laminate may include a positive C layer, a first protective layer stacked on the upper surface of the positive C layer, and a second protective layer stacked on the lower surface of the positive C layer.

[0161] The protective layer has uniaxial or biaxial characteristics and can exhibit negative A (nx = nz > ny), negative B (nx > ny > nz), negative C (nx = ny > nz), or positive B (nz > nx > ny) retardation characteristics. Here, nx, ny, and nz are the refractive indices of the protective layer in its slow axis, fast axis, and thickness direction, respectively, at a wavelength of 550 nm.

[0162] In one implementation, the protective layer may not include the positive A layer.

[0163] The protective layer can consist of a single layer or at least two layers.

[0164] The protective layer can be a polymer film composed of polymers, formed by depositing or transferring a low molecular weight or high molecular weight liquid crystal compound onto a transparent support to form a liquid crystal layer, or by depositing or transferring a low molecular weight or high molecular weight non-liquid crystal compound or a composition containing the same onto a transparent support and then curing it to form a coating. The film-type protective layer can be a film formed from at least one resin selected from: cellulose resins (including triacetyl cellulose (TAC), etc.), polyester resins (including polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, etc.), cyclic polyolefin (COP) resins, polycarbonate resins, polyethersulfone resins, polysulfone resins, polyamide resins, polyimide resins, polyolefin resins, polyarylate resins, polyvinyl alcohol resins, polyvinyl chloride resins, polyvinylidene chloride resins, and acrylamide resins, but is not limited thereto. The liquid crystal layer can be formed not only from the aforementioned nematic liquid crystals, smectic liquid crystals, and lyotropic liquid crystals, but also from typical liquid crystals known to those skilled in the art. The coating can be formed not only by using the aforementioned cellulose ester or polystyrene resins, but also by using typical low or high molecular weight materials known to those skilled in the art.

[0165] The protective layer may have in-plane delay, out-of-plane delay, and / or biaxiality within a predetermined range of Equations 1 and 2 without affecting the delay layer.

[0166] In one embodiment, at a wavelength of 550 nm, the protective layer may have an in-plane delay of about 20 nm or less, for example, about 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 nm, specifically about 0 nm to about 10 nm. Within this range, the protective layer does not affect the realization of the positive C layer effect.

[0167] In one embodiment, at a wavelength of 550 nm, the protective layer may have an out-of-plane retardation of about 10 nm or less, for example, about -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 nm, specifically about -10 nm to about 10 nm. Within this range, the protective layer does not affect the realization of the positive C layer effect.

[0168] The protective layer can have a thickness of about 20 μm to about 100 μm (specifically about 25 μm to about 40 μm). Within this range, the protective layer can be applied to the delay layer.

[0169] First polarizer and second polarizer

[0170] The first polarizer (110) and the second polarizer (120) are each used to convert natural light or polarized light into linearly polarized light through linear polarization in a certain direction, and can be made of a polymer film mainly composed of polyvinyl alcohol resin. Specifically, the first polarizer and the second polarizer can each be manufactured by dyeing the polymer film with iodine or dichroic dyes, and then stretching the dyed film in its machine direction (middle direction). Specifically, the first and second polarizers can be manufactured by swelling, dyeing, stretching, and crosslinking.

[0171] The first polarizer (110) and the second polarizer (120) may each have a total light transmittance of about 41% or greater (e.g., about 41% to 45%) and a polarization of about 99% or greater (e.g., about 99% to 100%). Within this range, the first polarizer and the second polarizer can improve screen quality.

[0172] The first polarizer (110) and the second polarizer (120) may each have a thickness of about 30 μm or less, specifically greater than about 0 μm to about 30 μm, more specifically about 2 μm to about 20 μm, and specifically about 4 μm to about 10 μm. Within this range, the first polarizer and the second polarizer may each be used in a polarizing plate.

[0173] The first polarizer (110) and the second polarizer (120) each have a light absorption axis corresponding to the machine direction (MD) and a light transmission axis corresponding to the transverse direction (TD). In the optical display device, the light absorption axis of the first polarizer is substantially orthogonal to the light absorption axis of the second polarizer.

[0174] First polarizer protective layer

[0175] The first polarizer protective layer (310) can be disposed on the light emitting surface of the first polarizer (110) to protect the first polarizer (110) or to further improve image quality by influencing the light emitted from the first polarizer.

[0176] The first polarizer protective layer (310) may include a protective film or a protective coating.

[0177] The protective film is an optically transparent film and can be formed from at least one of the following: for example, cellulose resins (including triacetyl cellulose (TAC), etc.), polyester resins (including polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, etc.), cyclic polyolefin resins, polycarbonate resins, polyethersulfone resins, polysulfone resins, polyamide resins, polyimide resins, polyolefin resins, polyarylate resins, polyvinyl alcohol resins, polyvinyl chloride resins, and polyvinylidene chloride resins. Specifically, the protective film can be a TAC film or a PET film. The protective coating can be formed from at least one of thermocurable compositions and photocurable compositions.

[0178] In one embodiment, at a wavelength of 550 nm, the first polarizer protective layer may have an in-plane retardation of about 0 nm or greater, for example, 0, 500, 1000, 1500, 2000, 2500, 3000, 3500, 4000, 4500, 5000, 6000, 7000, 8000, 9000, 10000, 11000, 12000, 13000, 14000, or 15000 nm, specifically about 0 nm to about 15,000 nm, and more specifically about 5,000 nm to about 12,000 nm. Within this range, the first polarizer protective layer can prevent the observation of a rainbow mura when formed with birefringence.

[0179] The first polarizer protective layer (310) may have a thickness of about 100 μm or less, specifically greater than about 0 μm to 80 μm, more specifically about 5 μm to about 80 μm, and even more specifically about 15 μm to about 80 μm. Within this range, the first polarizer protective layer may be used in a polarizing plate.

[0180] although Figure 1 Not shown, but a functional coating is formed on the upper surface of the first polarizer protective layer (310) to provide additional functionality to the viewer-side polarizer. For example, the functional coating may include a hard coating, an anti-fingerprint layer, an anti-reflective layer, an anti-glare layer, a low-reflectivity layer, etc. These functional coatings may be used individually or in combination.

[0181] Second polarizer protective layer and third polarizer protective layer

[0182] A second polarizer protective layer (320) and a third polarizer protective layer (330) can be respectively disposed on the light emitting surface of the second polarizer (120) and the light incident surface of the second polarizer (120) to protect the second polarizer or to further improve image quality by affecting the light emitted from the light source. Alternatively, a second polarizer protective layer (320) can be disposed on the light incident surface of the second polarizer (120) and a third polarizer protective layer (330) can be disposed on the light emitting surface of the second polarizer (120).

[0183] The second polarizer protective layer (320) and the third polarizer protective layer (330) may each include a protective film or a protective coating.

[0184] The protective film is an optically transparent film and can be formed from at least one of the following: for example, cellulose resins (including triacetyl cellulose (TAC), etc.), polyester resins (including polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, etc.), cyclic polyolefin resins, polycarbonate resins, polyethersulfone resins, polysulfone resins, polyamide resins, polyimide resins, polyolefin resins, polyaromatic ester resins, polyvinyl alcohol resins, polyvinyl chloride resins, and polyvinylidene chloride resins. Specifically, the protective film can be a TAC film or a PET film. The protective coating can be formed from at least one of thermosetting compositions and photocurable compositions.

[0185] In one embodiment, at a wavelength of 550 nm, the second polarizer protective layer may have an in-plane retardation of about 0 nm or greater, for example, about 0 nm to about 20 nm. Within this range, the second polarizer protective layer does not affect the light emitted from the second polarizer. At a wavelength of 550 nm, the third polarizer protective layer may have an in-plane retardation of about 0 nm or greater, for example, about 0 nm to about 15000 nm or about 5000 nm to about 12000 nm. Within this range, the second polarizer protective layer can prevent the observation of rainbow spots when formed with birefringence.

[0186] In another embodiment, at a wavelength of 550 nm, the second polarizer protective layer may have an in-plane retardation of about 0 nm or greater, for example, about 0 nm to about 15000 nm, specifically about 5000 nm to about 12000 nm. Within this range, the second polarizer protective layer can prevent the observation of rainbow spots when formed with birefringence. At a wavelength of 550 nm, the third polarizer protective layer may have an in-plane retardation of about 0 nm or greater, for example, about 0 nm to about 20 nm. Within this range, the second polarizer protective layer does not affect the light emitted from the second polarizer.

[0187] The second polarizer protective layer (320) and the third polarizer protective layer (330) may each have a thickness of about 100 μm or less, specifically greater than about 0 μm to about 80 μm, more specifically about 5 μm to about 80 μm, and even more specifically about 15 μm to about 80 μm. Within this range, the second polarizer protective layer and the third polarizer protective layer may each be used in a polarizing plate.

[0188] The second polarizer protective layer and the third polarizer protective layer can each be bonded to the second polarizer using the aforementioned adhesive layer.

[0189] Next, an optical display device according to an embodiment of the present invention will be described.

[0190] The optical display device includes an optical display module according to one embodiment of the present invention. The optical display device may include, but is not limited to, a liquid crystal display device.

[0191] The liquid crystal display device may include the optical display module according to the present invention.

[0192] The liquid crystal display device may further include a backlight unit. This backlight unit may be disposed outside the viewer-side polarizer or the light source-side polarizer. The backlight unit can be manufactured using typical optical elements known to those skilled in the art (such as light sources, light guide plates, optical sheets, reflectors, brightness enhancement films, etc.).

[0193] Invention Model

[0194] The present invention will now be described in more detail with reference to some embodiments. However, it should be noted that these embodiments are for illustrative purposes only and are not to be construed as limiting the invention in any way.

[0195] Example 1

[0196] A polarizer with a light transmittance of 43% was prepared by uniaxially stretching a polyvinyl alcohol film (PS#60, thickness before stretching: 60 μm, Kuraray Co., Ltd.) to 6 times its initial length in the MD direction in an iodine aqueous solution at 55 °C. The prepared polarizer was used as a first polarizer and a second polarizer.

[0197] A positive C layer is formed on the lower surface of a triacetyl cellulose (TAC) membrane (KC4CT1W, Re@550nm: 0nm to 5nm, Konica Minolta Co., Ltd.) by coating a predetermined thickness of a positive C layer composition (VM series, containing polystyrene compounds, Eastman Co., Ltd.), followed by drying the composition to remove the solvent. A first delayed layer is a laminate of the TAC membrane and the positive C layer.

[0198] A viewer-side polarizing plate is manufactured by bonding the lower surface of a polyethylene terephthalate (PET) film (AGSR12D-PET, with an anti-glare layer formed on its upper surface, Re@550nm:8600nm, TOYOBO Co., Ltd.) to the upper surface of a first polarizer, and bonding the upper surface of a TAC film to the lower surface of the first polarizer. The viewer-side polarizing plate comprises a positive C layer, a TAC film, a first polarizer, and a PET film, sequentially stacked on the light-emitting surface of the liquid crystal panel described below.

[0199] A light source-side polarizing plate is manufactured by bonding the lower surface of a triacetyl cellulose (TAC) film (KC4CT1W, Re@550nm: 0nm to 5nm, Konica Minolta Co., Ltd.) to the upper surface of a second polarizer, and bonding the upper surface of a polyethylene terephthalate (PET) film (TA053, glare layer, Re@550nm: 8600nm, TOYOBO Co., Ltd.) to the lower surface of the second polarizer. The light source-side polarizing plate comprises a TAC film, a second polarizer, and a PET film stacked sequentially on the light incident surface of the liquid crystal panel described below.

[0200] A liquid crystal panel is prepared having a second retardation layer (+A retardation layer) having an in-plane retardation Re1 as listed in Table 1 at a wavelength of 550 nm and including a liquid crystal layer (including IPS mode liquid crystal).

[0201] A liquid crystal display module is manufactured by bonding a viewer-side polarizing plate to the upper surface of a liquid crystal panel and a light source-side polarizing plate to the lower surface of a liquid crystal panel, such that the light absorption axis of the first polarizer is orthogonal to the light absorption axis of the second polarizer, and a first retardation layer is arranged between the liquid crystal panel and the first polarizer.

[0202] Examples 2 to 6

[0203] The liquid crystal display module was manufactured in the same manner as in Example 1, except that the in-plane delay Re1@550nm of the second delay layer, the out-of-plane delay Rth2@550nm of the first delay layer, and the out-of-plane delay Rth3@550nm of the positive C layer were changed as listed in Table 1.

[0204] Example 7

[0205] The liquid crystal display module was manufactured in the same manner as in Example 1, except that the positive C layer composition (VM series, containing cellulose ester compounds, Eastman Co., Ltd.), the in-plane retardation Re1@550nm of the second retardation layer, the out-of-plane retardation Rth2@550nm of the first retardation layer, and the out-of-plane retardation Rth3@550nm of the positive C layer were changed as listed in Table 1.

[0206] Comparative Example 1

[0207] The light source side polarizer was manufactured in the same manner as in Example 1.

[0208] The first polarizer was manufactured in the same manner as in Example 1. The lower surface of a polyethylene terephthalate (PET) film (AGSR12D-PET, with an anti-glare layer formed on its upper surface, Re@550nm: 8600nm, TOYOBO Co., Ltd.) was bonded to the upper surface of the first polarizer, and the upper surface of a triacetyl cellulose (TAC) film (KC4CT1W, Re@550nm: 0nm to 5nm, Konica Minolta Co., Ltd.) was bonded to the lower surface of the first polarizer. A viewer-side polarizer was manufactured by sequentially stacking a positive C layer (Rth@550nm = -100nm) and a positive A layer (Re@550nm = 90nm) on the lower surface of the triacetyl cellulose film. The viewer-side polarizer comprises a positive A layer, a positive C layer, a TAC film, the first polarizer, and a PET film sequentially stacked on the light-emitting surface of the liquid crystal panel described below.

[0209] A liquid crystal display module is manufactured by attaching a viewer-side polarizing plate and a light source-side polarizing plate to the light emitting surface and light incident surface of a liquid crystal panel (which does not have a phase retardation layer, does not have a positive A retardation layer, and includes an IPS liquid crystal layer), respectively.

[0210] Comparative Examples 2 to 6

[0211] The liquid crystal display module was manufactured in the same manner as in Example 1, except that the in-plane delay Re1@550nm of the second delay layer, the out-of-plane delay Rth2@550nm of the first delay layer, and the out-of-plane delay Rth3@550nm of the positive C layer were changed as listed in Table 1.

[0212] The delay of each of the second, first, and positive C layers was measured at a wavelength of 550 nm using an Axoscan delay meter (Axometry Co., Ltd.). All delay values ​​are expressed in nanometers.

[0213] Based on TechWiz 1D simulation (SANAYI SYSTEM), the liquid crystal display modules of the embodiment and comparative example were measured in black mode as ( Luminance at (45°, 60°) or (135°, 60°) (unit: cd / m²) 2 The results are shown in Table 1. Furthermore, the contrast ratios of the liquid crystal display modules in Examples 1, 3, and 5 are as follows: Figure 2 As shown.

[0214] [Table 1]

[0215]

[0216]

[0217] As shown in Table 1 and Figure 2 As shown, the optical display module according to the present invention has a density of less than 0.6 cd / m² in black mode. 2 The lateral brightness is increased, thereby improving lateral contrast. Furthermore, the optical display module according to the invention suppresses lateral light leakage.

[0218] Conversely, as shown in Table 1 and Figure 2 As shown, the optical display modules of Comparative Examples 2 to 6, which fail to satisfy relations 1 and 2, exhibit significantly higher lateral brightness in black mode compared to the optical display modules of the embodiments, resulting in significantly lower lateral contrast and significant lateral light leakage. Furthermore, the optical display module of Comparative Example 1, which includes a second retardation layer disposed outside the optical display panel between the first retardation layer and the optical display panel, exhibits significantly higher lateral brightness in black mode.

[0219] It should be understood that those skilled in the art can make various modifications, alterations, changes, and equivalent implementations without departing from the spirit and scope of the present invention.

Claims

1. An optical display module, comprising: Optical display panel; and a first polarizing plate disposed on at least one surface of the optical display panel, The first polarizing plate includes a first polarizer and a first retardation layer disposed between the first polarizer and the optical display panel, wherein the first retardation layer includes at least a positive C layer; The optical display panel includes a second delay layer; and The second delay layer and the first delay layer satisfy Equations 1 and 2: [Formula 1] │Re1 x Rth2│≥8450 [Formula 2] -2.10≤(Re1) / (Rth2)≤-1.20 (In formulas 1 and 2 above, Re1 is the in-plane delay (in nm) of the second delay layer at a wavelength of 550 nm, and Rth2 is the out-of-plane delay of the first delay layer at a wavelength of 550 nm (unit: nm).

2. The optical display module according to claim 1, wherein |Re1 x Rth2| ranges from 8450 to 13000.

3. The optical display module according to claim 1, wherein the second delay layer is a positive A(+A) delay layer.

4. The optical display module according to claim 1, wherein Re1 ranges from 10nm to 150nm.

5. The optical display module according to claim 1, wherein Rth2 ranges from -200nm to less than 0nm.

6. The optical display module according to claim 1, wherein the first polarizing plate is arranged on the outer side of the optical display panel.

7. The optical display module according to claim 1, wherein the positive C layer has an out-of-plane delay of -200 nm to less than 0 nm at a wavelength of 550 nm.

8. The optical display module according to claim 1, wherein the positive C layer is formed of a composition comprising at least one selected from cellulose compounds or polymers thereof and aromatic compounds or polymers thereof.

9. The optical display module according to claim 8, wherein the cellulose compound includes cellulose ester compounds, and the aromatic compound includes polystyrene compounds.

10. The optical display module according to claim 1, wherein the first delay layer is a single layer of the positive C layer.

11. The optical display module of claim 1, wherein the first delay layer comprises the positive C layer and a protective layer stacked on at least one surface of the positive C layer.

12. The optical display module according to claim 11, wherein the protective layer is a negative A, negative B, negative C or positive B delay layer having uniaxial or biaxial characteristics.

13. The optical display module according to claim 11, wherein the protective layer does not contain a positive A layer.

14. The optical display module of claim 11, wherein the protective layer has an in-plane delay of 20 nm or less at a wavelength of 550 nm.

15. The optical display module of claim 1, wherein the optical display panel further comprises a liquid crystal layer.

16. The optical display module according to claim 1, wherein the first polarizing plate includes the first polarizer, the first delay layer disposed on one surface of the first polarizer, and the first polarizer protective layer disposed on the other surface of the first polarizer.

17. The optical display module according to claim 1, wherein the optical display module comprises the optical display panel, a first polarizing plate disposed on one surface of the optical display panel, and a second polarizing plate disposed on the other surface of the optical display panel.

18. An optical display device comprising an optical display module according to any one of claims 1 to 17.

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