WO2016122276A1 - 편광자 - Google Patents
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- Publication number
- WO2016122276A1 WO2016122276A1 PCT/KR2016/001066 KR2016001066W WO2016122276A1 WO 2016122276 A1 WO2016122276 A1 WO 2016122276A1 KR 2016001066 W KR2016001066 W KR 2016001066W WO 2016122276 A1 WO2016122276 A1 WO 2016122276A1
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- WIPO (PCT)
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- polarizer
- polarizing plate
- liquid crystal
- crystal panel
- light
- Prior art date
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
Definitions
- the present application relates to a polarizer or a polarizing plate.
- LCD Liquid Crystal Display
- LCD Liquid Crystal Display
- an LCD is a display for positioning a liquid crystal between a lower substrate having a TFT (Thin Film Transistor) and an upper substrate having a color filter, and transmitting an electrical signal to the TFT to control the liquid crystal, and for controlling light transmission.
- TFT Thin Film Transistor
- This application provides a polarizing plate.
- the present application relates to a polarizing plate including a polarizer.
- polarizer means, for example, a functional device that exhibits a polarizing function, such as a poly (vinyl alcohol) -based film
- the polarizing plate means a device including other elements with the polarizer.
- Other elements included with the polarizer may include a protective film, an optical retardation film, an adhesive layer, an adhesive layer, or a low reflection layer of the polarizer, but are not limited thereto.
- the polarizer of the present application may be a polarizer for a high reflection liquid crystal panel.
- the term high reflection liquid crystal panel in the present application may mean a liquid crystal panel having a reflectance of 12% or more, 14% or more, 16% or more, or 18% or more.
- the reflectance is a reflectance with respect to light having a wavelength of about 550 nm, and is a reflectance measured on the upper substrate side.
- the reflectance of the highly reflective liquid crystal panel may be, for example, 30% or less, 28% or less, 26% or less, 24% or less, 22% or less, or 20% or less.
- the term upper substrate means a substrate closer to an observer who observes an image displayed by the liquid crystal panel among the two substrates in the structure of the liquid crystal panel including the liquid crystal interposed between the two substrates.
- a general liquid crystal panel includes a liquid crystal interposed between an upper substrate and a lower substrate.
- TFT thin film transistor
- a color filter is present on the upper substrate, and the color filter includes a so-called black matrix (BM).
- BM black matrix
- the reflectance is usually about 10% around (550 nm wavelength reference).
- the high reflection liquid crystal panel has a structure that does not include the BM, a color filter and a BM that do not exist on the upper substrate, and a structure that does not include the BM, compared to the existing structure as described above.
- the filter may have a structure or the like present in the lower substrate.
- the high reflection liquid crystal panel may be a panel in which a color filter and a TFT are disposed together on a lower substrate, in which case the color filter may or may not include the BM.
- the increased reflectance of the high reflection liquid crystal panel may affect the color of the display device, particularly the color of the black state.
- the term dark state refers to a state in which a liquid crystal panel is adjusted to block light from a light source, for example, voltage off in a normally black mode or voltage on in a normally white mode. It can mean a state.
- a larger light leakage may be caused by an increase in the aperture ratio in the dark state, and the light leakage may cause the color in the dark state to be approximately red or yellow. can do.
- the polarizer or the polarizing plate of the present application has the optical characteristics described below, and the optical characteristics can maximize the advantages while solving problems that may occur in the high reflection liquid crystal panel as described above.
- the high reflection liquid crystal panel to which the polarizer of the present application is applied may be a liquid crystal panel that does not include BM or a liquid crystal panel that does not have color filters on the upper substrate and is present with TFTs on the lower substrate.
- the liquid crystal panel that does not include the BM may or may not include a color filter, and in the case of including the color filter, the color filter may be present on the lower substrate rather than the upper substrate.
- the color filter may or may not include BM.
- a liquid crystal panel having such a structure, for example, a liquid crystal panel in which a color filter is present on the lower substrate, is advantageous for implementing various structures such as a curved structure, and may be advantageous in terms of luminance when BM is not present.
- the polarizer may be an upper polarizer of the liquid crystal panel.
- the term “upper” may mean a direction toward an observer who observes the image from the display apparatus when the display apparatus implements an image, and the term “lower” may mean the opposite direction.
- the upper polarizer may also be referred to as a viewer-side polarizer in other terms.
- the term lower polarizer may also be referred to as a back side polarizer or a light source side polarizer.
- the polarizer or the polarizing plate of the present application may have optically controlled characteristics.
- the polarizer or the polarizer may exhibit a range of coordinates in an INTERNATIONAL COMMISSION ON ILLUMINATION (CIE) Lab color space.
- the polarizer or the polarizing plate may satisfy at least one of the conditions 1 to 4 described below. That is, in the present application, the polarizer alone may satisfy any one of the following conditions 1 to 4, or the polarizing plate including the polarizer may satisfy any one of the following conditions 1 to 4. Conditions 1 to 4 described below do not give priority to any one condition.
- the performance of the polarizer or the polarizing plate can be further improved.
- the CIE Lab color space is a color space obtained by nonlinear conversion of the CIE XYZ color space based on the antagonistic theory of human vision.
- L value represents brightness
- L value of 0 represents black
- L value of 100 represents white. If the value of a is negative, the color is biased toward green, and if it is positive, the color is biased toward the red or violet side. If the value of b is negative, the color is biased to blue. If the value of b is positive, the color is biased to yellow.
- the polarizer or the polarizing plate has a -a value in the CIE Lab color space, for example, about 2 or less, less than 2, 1.95 or less, 1.9 or less, 1.9 or less, 1.85 or less, 1.8 or less, 1.8 or less, 1.75. Or less than 1.7, less than 1.7, less than 1.65, less than 1.6, less than 1.6, less than 1.55, less than 1.5, or less than 1.5.
- the -a value may be about 0.7 or more, 0.75 or more, 0.8 or more, 0.85 or more, about 0.9 or more, 0.95 or more, 1.0 or more, about 1.1 or more, about 1.3 or more, or about 1.4 or more.
- the polarizer or the polarizing plate may have a b value of about 4 or less, about 3.5 or less, about 3.5 or less, about 3 or less, about 3, about 2.5 or less, or less than about 2.5 in the CIE Lab color space.
- the b value may be at least about 1.5, at least about 1.5, at least about 2 or at least about 2.5.
- the polarizer or the polarizing plate may have a ratio of the -a value and the b value (-b / a, hereinafter referred to as C index) of about 2.5 or less or less than about 2.5.
- the C index may be at least about 1, at least about 1, at least about 1.25, at least about 1.25, at least about 1.5 or at least about 1.5.
- the polarizer or the polarizing plate may have a value of -b c of 40 or less in the CIE Lab color space.
- the -b c value is 38 or less, 36 or less, 34 or less, 32 or less, 30 or less, 28 or less, 26 or less, 24 or less, 22 or less, 20 or less, 18 or less, 16 or less, 14 or less, 12 in another example. 10 or less, 8 or less, 6 or less, 4 or less, 2 or less, 1 or less, or 0.5 or less.
- the above-b c value is 0.01 or more, 0.05 or more, 0.1 or more, 0.5 or more, 1 or more, 2 or more, 4 or more, 6 or more, 8 or more, 10 or more, 12 or more, 14 or more, 16 or more, 18 or more. , 20 or more, 22 or more, 24 or more, or 26 or more.
- the value of -b c may be within a range by a combination of any one of the above-mentioned upper limit and any of the lower limit.
- the polarizer has a light absorption axis formed in one direction.
- the value of -b c may be a value multiplied by ⁇ 1 of the value of b in the CIE Lab color space measured using linearly polarized light polarized in parallel with the light absorption axis. That is, the a and b values under the conditions 1 to 3 may be the a and b values measured for the unpolarized light.
- the b c value can be measured in the same manner, for example, in the measurement of the b value in a state in which two light polarizers or polarizing plates are perpendicular to each other.
- the polarizer or the polarizing plate may satisfy any one or two or more of the above conditions 1 to 4, or may satisfy all of the above.
- Such a polarizer or a polarizing plate may be applied to a liquid crystal panel, in particular, the above-mentioned high reflection liquid crystal panel, thereby maintaining or maximizing the advantages of the liquid crystal panel while improving its disadvantages, for example, visibility in the dark state.
- the polarizer having the optical characteristics as described above can block or absorb light having a long wavelength, such as red to yellow light, from the light from the liquid crystal panel, thereby darkening the light. It is possible to improve the luminous properties at.
- the polarizer or the polarizing plate may satisfy at least condition 2 in the conditions 1 to 4 weeks, and further satisfy condition 1 and / or 3. In another example, the polarizer or the polarizing plate satisfies at least condition 3, and may further satisfy condition 1 and / or 2. In addition, in another example, the polarizer or the polarizing plate may satisfy all of the above conditions 1 to 3. In another example, the polarizer or the polarizing plate satisfies at least the condition 4, and may further satisfy at least one of the conditions 1 to 3.
- the polarizer or the polarizing plate satisfies at least conditions 2 and 4, further satisfies condition 1 and / or 3, at least satisfies conditions 3 and 4, and further satisfies condition 1 and / or 2.
- the above conditions 1 to 4 may be satisfied.
- Each numerical value in the CIE Lab color space may be measured by applying a general method of measuring each coordinate of the color space.
- a spectrophotometer having a detector in the form of an integrating sphere at a measurement position. ) (ex. CM-2600d, KONICA MINOLTA) can be measured according to the manufacturer's manual.
- each coordinate of the CIE Lab color space may be measured in a state where the polarizer or the polarizer is attached to a liquid crystal panel, for example, the high reflection liquid crystal panel, or may be measured with respect to the polarizer or the polarizer itself. .
- the polarizer or the polarizing plate can satisfy other functions required for the polarizer or the polarizing plate while exhibiting the above-described optical characteristics.
- the polarizer or the polarizing plate may have a transmittance Ts of about 35% or more or about 40% or more for unpolarized light.
- the transmittance Ts may be about 60% or less, about 55% or less, about 50% or less, or about 45% or less.
- the transmittance Ts may be, for example, a transmittance measured with respect to one polarizer or a polarizing plate.
- the polarizer or the polarizing plate has a light absorption axis and a light transmission axis orthogonal thereto, and has a transmittance Tc for linearly polarized light having an angle within a range of about ⁇ 5 degrees to 5 degrees with respect to the light absorption axis. Up to about 0.009%, up to about 0.006%, up to about 0.005%, up to about 0.004%, up to about 0.001% or up to about 0.0009%.
- the transmittance Tc may be about 0.0001% or more.
- the transmittance Tc is measured when the overlapping state is scanned for each angle so that the light absorption axis of each of the polarizers or polarizing plates forms an angle ranging from 0 degree to 360 degrees in the state where two polarizers or polarizing plates are overlapped.
- the transmittance Tc representing the minimum transmittance may be referred to.
- At least one of the two polarizers or polarizing plates overlapping above is a polarizer or a polarizing plate according to the present application, and the other polarizer or the polarizing plate is a polarizer or a polarizing plate according to the present application, or another polarizer or a polarizing plate, for example, in measuring equipment It may be a polarizer or a polarizing plate provided.
- the polarizer or the polarizing plate may have a polarization degree of about 99.9% or more or about 99.99% or more.
- the degree of polarization is a numerical value calculated according to Equation 1 below.
- Polarization degree (P) (%) ⁇ (Tp-Tc) / (Tp + Tc) ⁇ 1/2 ⁇ 100
- Tp is the transmittance of the polarizer with respect to the linearly polarized light at an angle of about 85 to 95 degrees with the light absorption axis of the polarizer or polarizer
- Tc is from about -5 degrees to the light absorption axis of the polarizer or polarizer
- the transmittance Tp is a transmittance while scanning the overlapping state by angle so that the light absorption axis of each of the polarizers or polarizers forms an angle ranging from 0 degree to 360 degrees in a state where two polarizers or polarizers are overlapped in another example.
- the transmittance may be the transmittance at the point of time when the maximum value is measured, and the transmittance Tc may be the transmittance at the time point of the minimum transmittance during the angle-specific scan as described above.
- the above-mentioned transmittances (Ts, Tc, Tp) are numerical values measured for light of about 550 nm.
- a polarizer or a polarizing plate exhibiting such transmittance and polarization degree may be applied to a liquid crystal panel to exhibit excellent light transmission or blocking function.
- the manner of producing such a polarizer or polarizing plate is not particularly limited.
- the polarizer or the polarizing plate particularly the polarizer or the polarizing plate showing the coordinates in the CIE Lab color space described above, can be produced by adjusting the absorption rate of the polarizer included in the polarizing plate.
- the polarizer is manufactured such that the light blocking rate for light of any wavelength within a range of about 560 nm to about 750 nm, for example, light of a wavelength of about 700 nm, is within a range of about 5.1 to 6.0.
- the polarizer or the polarizer may satisfy the conditions 1 to 4 described above.
- the light of any wavelength in the range of about 560 nm to about 750 nm, for example, the light of about 700 nm, has an angle of approximately -5 degrees to 5 degrees with respect to the light absorption axis of the polarizer. It can be linearly polarized light polarized at any angle or approximately parallel within the range of 3 degrees to 3 degrees.
- the light blocking rate may mean, for example, absorbance.
- the absorbance is calculated by the formula? Log (Tc), where Tc is the above-described transmittance, that is, the light absorption axis of each polarizer in the state of overlapping two polarizers to form an angle ranging from 0 degree to 360 degrees.
- Tc is the above-described transmittance
- the transmittance When the transmittance is measured while scanning the overlap state for each angle, it may be a transmittance at the time of displaying the minimum transmittance.
- the polarizer or the polarizing plate including the same may exhibit the coordinates in the aforementioned CIE color space.
- a poly (vinyl alcohol) -based polarizer which is a typical absorption type polarizer, includes a PVA film and an anisotropic absorbent material such as a dichroic dye or iodine adsorbed on the PVA film.
- the light blocking rate may be controlled by adjusting the ratio or type of the material or adjusting the degree of orientation of the anisotropic absorbent material.
- the PVA-based polarizer may be prepared by subjecting the PVA-based film to each treatment such as swelling, dyeing, crosslinking and stretching, and washing and drying the process conditions.
- the light blocking rate may be controlled by adjusting or further processing.
- the dyeing process may be performed by immersing the PVA-based film in a treatment tank containing iodine and potassium iodide, in which the concentration of iodine and potassium iodide in the treatment tank is adjusted or adsorbed after dyeing.
- the light blocking rate may be adjusted by further removing or supplementing one or more components of iodo and / or potassium iodide, and the draw ratio in the stretching process together with or separately from the process may be used.
- the light blocking rate may be adjusted by controlling the degree of orientation of the anisotropic absorbing material (iodine, etc.) through the control of.
- the method of adjusting the light blocking rate is just one example in which the polarizer of the present application can be manufactured, and any other method may be applied as long as the light blocking rate of the polarizer can be adjusted in the above-described range.
- the polarizer of the present application may include an anisotropic absorbent material which is adsorbed and oriented on the PVA-based film and the PVA-based film.
- PVA film As the PVA film as described above, for example, a PVA film that is conventionally used for a polarizer may be used.
- PVA or its derivative is mentioned as a material of such a PVA system film.
- the derivatives of PVA include polyvinyl formal and polyvinyl acetal.
- olefins such as ethylene or propylene
- unsaturated carboxylic acids such as acrylic acid, methacrylic acid or crotonic acid
- alkyl esters or acrylamides thereof The denatured by etc. are mentioned.
- the degree of polymerization of PVA is usually about 100 to 10000, about 1000 to 10000, and the degree of saponification is about 80 mol% to 100 mol%, but is not limited thereto.
- Examples of the PVA film may further include hydrophilic polymer films such as ethylene vinyl acetate copolymer-based partially saponified films, polyene-based alignment films such as dehydrated products of PVA, and dehydrochloric acid treated products of polyvinyl chloride.
- hydrophilic polymer films such as ethylene vinyl acetate copolymer-based partially saponified films
- polyene-based alignment films such as dehydrated products of PVA, and dehydrochloric acid treated products of polyvinyl chloride.
- additives such as a plasticizer or surfactant
- a plasticizer or surfactant may be contained in a PVA system film.
- the plasticizer may include polyols and condensates thereof, and examples thereof include glycerin, diglycerine, triglycerine, ethylene glycol, propylene glycol, polyethylene glycol, and the like.
- the ratio is not particularly limited, and may typically be about 20% by weight or less in the PVA-based film.
- the thickness of the PVA-based film is not particularly limited, and may be appropriately selected within a range in which each of the above-described optical characteristics can be satisfied.
- the kind of anisotropic absorbent material that may be included in the polarizer is also not particularly limited.
- those which can satisfy the above-described optical properties may be appropriately selected.
- an anisotropic absorbent material iodine can be illustrated.
- the ratio of the anisotropic absorbent material in the polarizer is not particularly limited as long as it can satisfy the above-described optical properties, and those skilled in the art can easily set the range through simple experiments or predictions.
- Such a polarizer can be manufactured by performing at least a dyeing process, a crosslinking process, and an extending process to a PVA system film, for example.
- a dyeing step, the crosslinking step and the stretching step respective treatment baths of the dyeing bath, the crosslinking bath and the stretching bath are used, and the treatment liquids according to the respective steps may be used for each of these treatment baths.
- an anisotropic absorbent substance such as iodine can be adsorbed and / or oriented to the PVA film.
- This dyeing process can be carried out in conjunction with the stretching process.
- Dyeing can generally be carried out by immersing the film in a solution containing an anisotropic absorbent material, for example an iodine solution.
- an iodine solution for example, an iodine solution and an aqueous solution in which iodine ions are contained by an iodide compound as a dissolution aid can be used.
- potassium iodide lithium iodide, sodium iodide, zinc iodide, aluminum iodide, lead iodide, copper iodide, barium iodide, calcium iodide, tin iodide or titanium iodide may be used.
- concentration of iodine and / or iodide ions in the iodine solution may be adjusted to achieve a light blocking rate at which the above-described optical properties can be satisfied.
- the process variable may be adjusted to enable the light blocking rate to be achieved by an additional process other than the dyeing process, and in this case, the concentration in the dyeing process may be applied in the usual range.
- the temperature of the iodine solution is typically about 20 ° C. to 50 ° C., 25 ° C. to 40 ° C.
- the immersion time is typically about 10 seconds to 300 seconds or about 20 seconds to 240 seconds, but is not limited thereto. It may be possible to control the light blocking rate of the polarizer through the adjustment of the concentration of the iodine solution and / or immersion time therefor.
- the crosslinking process performed in the manufacturing process of the polarizer may be performed using a crosslinking agent such as, for example, a boron compound.
- a crosslinking agent such as, for example, a boron compound.
- the order of this crosslinking process is not particularly limited, and may be performed together with the dyeing and / or stretching process, or proceed separately, for example.
- a crosslinking process can also be performed in multiple times.
- the boron compound boric acid or borax may be used.
- the boron compound can be generally used in the form of an aqueous solution or a mixed solution of water and an organic solvent, and an aqueous boric acid solution is usually used.
- the boric acid concentration in the aqueous boric acid solution may be selected in an appropriate range in consideration of crosslinking degree and heat resistance thereof.
- An aqueous solution of boric acid can also contain an iodide compound such as potassium iodide, and the above-described light blocking rate can also
- the crosslinking process may be performed by immersing the PVA-based film in an aqueous solution of boric acid.
- the treatment temperature is typically in the range of 25 ° C. or higher, 30 ° C. to 85 ° C. or 30 ° C. to 60 ° C.
- the treatment time is typically 5 seconds to 800 seconds or 8 seconds to 500 seconds, but is not limited thereto. It is not.
- An extending process is generally performed by uniaxial stretching. Such stretching may be carried out together with the dyeing and / or crosslinking process.
- the stretching method is not particularly limited and, for example, a wet stretching method may be applied. In this wet stretching method, for example, stretching after dyeing is generally performed, but the stretching may be performed with crosslinking, and may be performed in multiple or multiple stages.
- the treatment liquid applied to the wet stretching method may contain an iodide compound such as potassium iodide, and the light blocking rate may also be controlled by adjusting the ratio in this process.
- the treatment temperature is usually in the range of 25 ° C. or higher, 30 ° C. to 85 ° C. or 50 ° C. to 70 ° C.
- the treatment time is usually 10 seconds to 800 seconds or 30 seconds to 500 seconds, but is not limited thereto. .
- the total draw ratio may be adjusted in consideration of the orientation characteristics, etc., and may be 3 to 10 times, 4 to 8 times, or 5 to 7 times the total draw ratio based on the original length of the PVA-based film.
- the present invention is not limited thereto.
- the total draw ratio may mean a cumulative draw ratio including stretching in each step when stretching is performed even in a swelling step other than the stretching step.
- Such a total draw ratio may be adjusted to an appropriate range in consideration of the orientation, the processability of the polarizer or the possibility of stretch cutting.
- a swelling process may be performed before performing the said process in addition to the said dyeing, bridge
- swelling the contamination of the surface of the PVA-based film and the antiblocking agent can be washed, and there is also an effect of reducing nonuniformity such as dyeing variation.
- the main component of the treatment liquid is water, and if necessary, a small amount of additives such as iodide compounds such as potassium iodide or a surfactant, a small amount of alcohol, and the like may be contained. In this process, it is possible to adjust the above-described light blocking rate by adjusting the process variable.
- the treatment temperature in the swelling process is usually about 20 ° C. to 45 ° C. or 20 ° C. to 40 ° C., but is not limited thereto. Since swelling variations can cause staining variations, the process parameters can be adjusted so that the occurrence of such swelling variations is suppressed as much as possible.
- the draw ratio may be about 6.5 times or less, 1.2 to 6.5 times, 2 to 4 times or about 2 to 3 times the original length of the PVA-based film. Stretching in the swelling process can control the stretching in the stretching step performed after the swelling step to be small, and can control so that the stretching fracture of the film does not occur.
- Metal ion treatment may be performed in the manufacturing process of the polarizer.
- Such a process is performed by immersing a PVA system film in the aqueous solution containing a metal salt, for example. This allows metal ions to be contained in the crown.
- the color tone of the PVA-based polarizer can also be adjusted by adjusting the type or proportion of metal ions.
- metal ions that can be applied metal ions of transition metals such as cobalt, nickel, zinc, chromium, aluminum, copper, manganese or iron may be exemplified, and color adjustment may be possible by selecting an appropriate kind of them. have.
- the washing process may be performed after dyeing, crosslinking and stretching.
- This washing process can be performed with a solution of iodine compounds such as potassium iodide.
- the above-described light blocking rate may also be controlled through the concentration of the iodide compound in the solution or the treatment time of the cleaning process. Therefore, the concentration of the iodide compound and the treatment time into the solution may be adjusted in consideration of the light blocking rate.
- the washing process may be performed using water.
- washing with water and washing with iodine compound solution may be combined, and a solution containing a liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol or propanol may also be used.
- a liquid alcohol such as methanol, ethanol, isopropyl alcohol, butanol or propanol
- a drying process may be performed to manufacture a polarizer.
- a drying process for example, in consideration of the moisture content required for the polarizer and the like can be carried out at an appropriate temperature for a suitable time, such conditions are not particularly limited.
- a desired polarizer may be obtained through adjustment of process variables in the above processes.
- the contents are mainly described through PVA-based polarizers, but the polarizers applicable in the present application are not limited to PVA-based polarizers, and other known polarizers may be described above by adjusting light blocking rates by a known method. Characteristics can be satisfied.
- the present application also relates to a polarizing plate, which may include at least the polarizer.
- a polarizer protective film, an adhesive layer, an adhesive layer, a retardation film or a low reflection layer may be exemplified.
- the properties of the overall polarizing plate can be adjusted through adjustment of the other elements, thereby improving the suitability for use in the present application. For example, by adjusting the light blocking rate of the entire polarizing plate in such a manner as to include a specific dye or dye in the protective film, the pressure-sensitive adhesive layer, the adhesive layer, the retardation film and / or the low reflection layer, the required level of physical properties can be adjusted. have.
- a film of a known material may be used.
- a thermoplastic resin having excellent transparency, mechanical strength, thermal stability, moisture barrier property, or isotropy can be used.
- resins include cellulose resins such as TAC (triacetyl cellulose), polyester resins, polyether sulfone resins, polysulfone resins, polycarbonate resins, polyamide resins, polyimide resins, polyolefin resins, (meth) acrylic resins, Cyclic polyolefin resin, such as norbornene resin, polyarylate resin, polystyrene resin, polyvinyl alcohol resin, a mixture of the above, etc.
- the protective film may be present on one side or both sides of the polarizer, where each protective film may be the same or different.
- the cured resin layer which hardened heat or photocurable resin such as (meth) acrylic-type, urethane type, acrylurethane type, epoxy type, or silicone type, can also be applied as said protective film.
- the thickness of the protective film can be appropriately adjusted, and usually within the range of 1 to 500 ⁇ m, 1 to 300 ⁇ m, 5 to 200 ⁇ m or 5 to 150 ⁇ m in view of workability such as strength or handleability, thinning or the like. Can be.
- the retardation film a general material may be applied.
- a biaxially or biaxially stretched birefringent polymer film or an alignment film of a liquid crystal polymer may be applied.
- the thickness of the retardation film is also not particularly limited.
- the above-described protective film or retardation film may be attached to the polarizer by an adhesive or the like, and such protective film may be subjected to easy adhesion treatment such as corona treatment, plasma treatment, primer treatment or saponification treatment.
- a hard coat layer, a low reflection layer, an antireflection layer, an anti-sticking layer, a diffusion layer, or a haze layer may exist on a surface opposite to the surface attached to the polarizer of the protective film. It may also be possible to control the properties of the polarizing plate through the control of the properties of the layer.
- the polarizing plate may include various elements such as a reflecting plate or a semi-transmissive plate, and the kind thereof is not particularly limited.
- An adhesive may be used for adhesion of the polarizer and the protective film.
- an isocyanate based adhesive a polyvinyl alcohol based adhesive, a gelatin based adhesive, a vinyl latex based or an aqueous polyester, etc. may be exemplified, but is not limited thereto.
- a water-based adhesive may be generally used, but a solvent-free photocurable adhesive may be used depending on the type of the film to be attached.
- the polarizing plate may include an adhesive layer for adhesion with other members such as a liquid crystal panel.
- the pressure-sensitive adhesive for forming the pressure-sensitive adhesive layer is not particularly limited, and for example, an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyamide, a polyether, or a polymer such as fluorine or rubber may be appropriately selected and used. have. Attachment formation of the adhesive layer with respect to the single side
- the exposed surface of the pressure-sensitive adhesive layer may be covered with a release film temporarily attached for the purpose of preventing contamination thereof until it is practically provided.
- UV absorbing ability may be provided to the polarizer, the protective film, the pressure-sensitive adhesive layer, and the like contained in the polarizing plate. Such ultraviolet absorbing ability can be implemented, for example, by including an ultraviolet absorber in an appropriate ratio in each element.
- an ultraviolet absorber a salicylic acid ester compound, a benzophenol compound, a benzotriazole compound, a cyanoacrylate compound, or a nickel complex salt compound may be used, but is not limited thereto.
- the present application also relates to a display device.
- the display device may include at least the polarizer or the polarizer.
- the display device may include a liquid crystal panel and the polarizer or polarizer disposed on one side of the liquid crystal panel.
- the polarizer or the polarizer may be included as an upper polarizer or a polarizer, that is, a viewer-side polarizer or a polarizer.
- the liquid crystal panel may include an upper substrate and a lower substrate, and may include a liquid crystal layer between the upper substrate and the lower substrate.
- the liquid crystal panel may be a high reflection liquid crystal panel described above, for example, a liquid crystal panel not including BM.
- the liquid crystal panel may be a liquid crystal panel in which both the TFT and the color filter exist on the lower substrate side.
- the polarizer or the polarizing plate may improve the disadvantages, for example, reflection visibility characteristics in a dark state while maintaining or maximizing the advantages of the liquid crystal panel.
- the display device may include an additional polarizer or a polarizer (hereinafter, referred to as a second polarizer or a second polarizer).
- a second polarizer or a second polarizer for example, the above-mentioned polarizer or polarizing plate (hereinafter, referred to as a first polarizer or a first polarizing plate) of the present application is disposed on the upper side, that is, the viewing side, of the liquid crystal panel, and the lower side, that is, the back side or the light source side
- the second polarizer or the second polarizer may be disposed.
- the second polarizer or the second polarizer may be adjusted such that the light blocking rate (light absorption rate or light reflectance) at any wavelength within the range of 380 nm to 520 nm is about 4 to 6, for example. have.
- the light blocking rate in the above may be, for example, the same concept as the absorbance described above.
- the method of adjusting the light blocking rate of the second polarizing plate or the second polarizer as described above is not particularly limited, and a known method may be applied.
- the optical property of the second polarizer or the second polarizer is adjusted as described above when the first polarizer or the first polarizer of the present application is applied to the upper polarizer or the polarizer of the aforementioned high reflection liquid crystal panel, the dark state and the bright The display characteristics in the state can be greatly improved.
- the specific structure of the high reflection liquid crystal panel is not particularly limited.
- the liquid crystal panel may have the same structure as a known liquid crystal panel except that the BM is not included.
- the color filter may be present on any of the upper and lower substrates, May be present on the lower substrate side.
- the type of liquid crystal layer included in the liquid crystal panel is not particularly limited, and for example, all of the liquid crystal layers of known modes such as VA, IPS, TN, or STN may be applied.
- a polarizer or a polarizing plate which is applied to various types of display devices, particularly a display device including a high reflection liquid crystal panel, exhibiting excellent characteristics may be provided.
- a display device including the polarizer or the polarizer may be provided.
- 1 to 9 are views showing the transmittance for each wavelength of each polarizer sample prepared in the embodiment.
- FIG. 10 is a view showing a difference in reflectance between a normal panel and a high reflection panel.
- FIG. 11 is a view showing reflectance when a polarizer is applied to a general panel and a high reflection panel.
- transmittance, polarization degree, CIE color coordinate, etc. were measured for the polarizer itself according to the manufacturer's manual using a JASCO V-7100 Spectrophotometer.
- the polarizer sample was prepared by performing the following swelling, dyeing, crosslinking, stretching, and washing processes on a PVA film having an average degree of polymerization of about 2400 and a thickness of about 60 ⁇ m as a raw film.
- Process variables in the process for example, the concentration of iodine or iodine ions in the treatment liquid or the treatment time into the treatment liquid were adjusted to implement the characteristics shown in Table 1 for each sample.
- Swelling was performed by immersing the PVA film in a swelling bath for an appropriate time using pure water as a treatment liquid.
- the dyeing process was carried out by immersing the PVA film at an appropriate temperature in a dyeing solution in which the concentrations of iodine and potassium iodide were adjusted at an appropriate temperature, in which the PVA film was stretched to an appropriate range.
- the crosslinking process was performed by immersing the PVA film in an aqueous solution containing boric acid and potassium iodide in an appropriate ratio as a treatment solution of the crosslinking bath and stretching the film to a predetermined range.
- the stretching process is also a treatment solution of the stretching bath. It was carried out in a treatment liquid containing potassium at a predetermined concentration. Subsequently, as a process liquid of a washing bath, the sample was manufactured through the washing process and drying process using the aqueous solution containing potassium iodide in a predetermined ratio.
- the characteristics of each sample are as follows.
- 1 to 9 show the wavelength-specific transmittances (Tc) measured for the samples 1 to 9, respectively, and the wavelength-specific transmittances measured using linearly polarized light polarized parallel to the light absorption axis of the polarizer.
- Tc wavelength-specific transmittance
- the transmittance (Tc) tends to increase as the wavelength becomes shorter about 500 nm, and the wavelength around 700 nm is shown.
- the transmittance (Tc) tends to increase as the wavelength becomes longer. From these results, it can be seen that the polarizers of the samples 1 to 7 can effectively block light leakage that may be shifted from red to yellow in the dark state even when applied to the high reflection liquid crystal panel.
- Sample 1, 2, 4, and 6 will be more effective as described above.
- samples 8 and 9 it can be seen that the same tendency as that of samples 1 to 7 is not confirmed.
- FIG. 10 is a view illustrating reflection characteristics of the general panel and the high reflection liquid crystal panel (HRL). As shown in the drawing, a highly reflective liquid crystal panel (HRL panel) exhibits a higher reflectance than a general liquid crystal panel.
- FIG. 11 is a view illustrating reflectance when the polarizer is applied to the upper side of the general panel and the high reflection liquid crystal panel.
- the lowest reflectance (A) at the wavelength of 700 nm is a case in which a normal polarizer is applied to a general panel
- the reflectance thereon (B) is that of a sample 4 having a low reflection layer formed on a high reflection liquid crystal panel.
- the case where the polarizer is applied and the reflectance above it (C) is a case where the polarizer of Sample 4 is applied to the high reflection liquid crystal panel without the treatment of the low reflection layer, and the case where the reflectance is shown (D) is high
- This is the case where a general polarizer is applied to the reflective panel.
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Abstract
Description
Claims (18)
- 일 방향으로 형성된 광흡수축을 가지며, 하기 조건 1 내지 4 중에서 적어도 하나의 조건을 만족하는 편광자를 포함하는 편광판:조건 1: CIE Lab 색공간에서 -a값이 1.6 이하:조건 2: CIE Lab 색공간에서 b값이 4 이하:조건 3: CIE Lab 색공간에서 -a값과 b값의 비율(-b/a)이 2.5 이하:조건 4: CIE Lab 색공간에서의 -bc값이 0.05 내지 40.
- 제 1 항에 있어서, 조건 1 내지 3 중 2개 이상의 조건을 만족하는 편광자를 포함하는 편광판.
- 제 1 항에 있어서, 조건 2를 만족하고, 추가로 조건 1 또는 3을 만족하는 편광자를 포함하는 편광판.
- 제 1 항에 있어서, 조건 3을 만족하고, 추가로 조건 1 또는 2를 만족하는 편광자를 포함하는 편광판.
- 제 1 항에 있어서, 조건 1 내지 3을 모두 만족하는 편광자를 포함하는 편광판.
- 제 1 항에 있어서, 조건 4를 만족하고, 조건 1 내지 3 중 하나 이상을 만족하는 편광자를 포함하는 편광판.
- 제 1 항에 있어서, 550 nm 파장의 광에 대한 반사율이 12% 이상인 액정 패널에 적용되는 편광판.
- 제 7 항에 있어서, 액정 패널은, 블랙 매트릭스를 포함하지 않는 액정 패널 또는 컬러 필터가 상부 기판에는 존재하지 않고, 하부 기판에 존재하는 액정 패널인 편광판.
- 제 1 항에 있어서, 편광도가 99.9% 이상인 편광자를 포함하는 편광판.
- 제 1 항에 있어서, 560 nm 내지 약 750 nm 범위 내의 어느 한 파장의 광에 대한 광차단율이 5.1 내지 6.0의 범위 내에 있는 편광자를 포함하는 편광판.
- 제 1 항에 있어서, 편광자는, PVA계 필름 및 상기 PVA계 필름상에 흡착 배향되어 있는 이방 흡수성 물질을 포함하는 편광판.
- 제 11 항에 있어서, 이방 흡수성 물질은 요오드인 편광자.
- 제 1 항에 있어서, 편광자 보호 필름, 점착제층, 접착제층, 위상차 필름 또는 저반사층을 추가로 포함하는 편광판.
- 제 1 항의 편광판을 포함하는 디스플레이 장치.
- 제 14 항에 있어서, 550 nm 파장의 광에 대한 반사율이 12% 이상인 액정 패널을 추가로 포함하고, 편광판이 상기 액정 패널의 시인측에 배치되어 있는 디스플레이 장치.
- 제 14 항에 있어서, 블랙 매트릭스를 포함하지 않는 액정 패널 또는 컬러 필터가 상부 기판에는 존재하지 않고, 하부 기판에 존재하는 액정 패널을 추가로 포함하고, 편광판이 상기 액정 패널의 시인측에 배치되어 있는 디스플레이 장치.
- 제 15 항 또는 제 16 항에 있어서, 액정 패널의 배면측에 배치된 제 2 편광자 또는 제 2 편광판을 추가로 포함하는 디스플레이 장치.
- 제 17 항에 있어서, 제 2 편광자 또는 제 2 편광판은, 380 nm 내지 520 nm의 범위 내의 어느 한 파장에서의 광차단율이 4 내지 6의 범위 내인 디스플레이 장치.
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CN201680012875.0A CN107407760B (zh) | 2015-01-30 | 2016-02-01 | 偏光元件 |
EP16743754.0A EP3252510A4 (en) | 2015-01-30 | 2016-02-01 | Polariser |
US15/547,034 US10302833B2 (en) | 2015-01-30 | 2016-02-01 | Polarizer |
JP2017539631A JP6777286B2 (ja) | 2015-01-30 | 2016-02-01 | 偏光子 |
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KR1020160012172A KR102040460B1 (ko) | 2015-01-30 | 2016-02-01 | 편광자 |
KR1020160012170A KR101713476B1 (ko) | 2015-01-30 | 2016-02-01 | 편광판 |
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