CN110187426B - Ultrathin wide-wave-range circular polarizing plate and application thereof - Google Patents
Ultrathin wide-wave-range circular polarizing plate and application thereof Download PDFInfo
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- CN110187426B CN110187426B CN201810199671.3A CN201810199671A CN110187426B CN 110187426 B CN110187426 B CN 110187426B CN 201810199671 A CN201810199671 A CN 201810199671A CN 110187426 B CN110187426 B CN 110187426B
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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
- G02B5/3083—Birefringent or phase retarding elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
Abstract
The invention provides an ultrathin wide-wave-range circular polarizing plate, which comprises a plurality of layersThe linear polarizer and the composite quarter-phase retardation film are arranged, and the composite quarter-phase retardation film is a liquid crystal inverse dispersion film; the composite quarter-phase retardation film comprises a first phase retardation film and a second phase retardation film which are combined in a laminating way, and the linear polarizer is laminated and arranged on one side of the first phase retardation film far away from the second phase retardation film; the composite in-plane phase difference value R of the composite quarter-phase retardation filmoIs 120nm to 190nm, and an acute angle formed by an optical axis of the composite quarter-phase retardation film and an absorption axis of the linear polarizing plate is 11 DEG to 21 deg.
Description
Technical Field
The invention belongs to the technical field of polarizing plates, and particularly relates to an ultrathin broadband circular polarizing plate and application thereof.
Background
The property that the liquid crystal molecules have different refractive indices in different axial directions is called birefringence (birefringence) of the liquid crystal molecules. The birefringence of the liquid crystal molecules causes the polarization direction of polarized light to be changed and an optical retardation phenomenon (optical retardation) to occur when the polarized light passes through the liquid crystal molecules, thereby generating a phase difference, that is, optical anisotropy of the liquid crystal molecules (optical anisotropy). On one hand, the optical anisotropy of the liquid crystal can change the light polarization direction, so that the liquid crystal can be used for regulating and controlling the light transmittance to achieve the light and shade effect on the display, and further applied to the display. On the other hand, the liquid crystal molecular film layer may also be used as a phase difference plate (optical retarder) due to an optical retardation phenomenon caused by optical anisotropy. When the phase difference plate is applied, the phase difference plate can be matched on the liquid crystal display according to the required phase difference value, so that the light leakage of the liquid crystal display is reduced, the display contrast is improved, and the display effect of the liquid crystal display is improved.
The quarter-phase retardation film is an optical film which can reversely convert linear polarized light and circular polarized light, and the quarter-phase retardation film is widely applied to the field of liquid crystal display as a phase difference plate. For example, in the outdoor sunlight or indoor strong light, the mobile phones on the market at present cannot effectively identify the information displayed on the screen of the mobile phone. In view of this, liquid crystal panel manufacturers have developed a transflective panel with a quarter-phase retardation film. The display device using the semi-reverse-penetrating panel as the display panel can easily watch the content of the mobile phone even under the big sun. In addition, in an organic light emitting diode display (OLED), a metal electrode easily reflects natural light in the environment to reduce the contrast, and a technician attaches a circular polarizing plate including a linear polarizing plate and a quarter-phase retardation film to an OLED panel to solve the problem. The linear polarizer converts natural light into linear polarized light, the quarter-phase retardation film can reversely convert the linear polarized light and circular polarized light, and the circular polarized light can be converted in the mirror reflection process, for example, the original left-handed circular polarized light can be converted into right-handed circular polarized light in the mirror reflection process, and vice versa. Therefore, by utilizing the characteristics of the optical film material and the circular polarized light, after the circular polarized light plate is adhered to the metal electrode which is easy to reflect light of the OLED, when the external natural light enters the linear polarized light plate, the external natural light is converted into the linear polarized light, then the linear polarized light is converted into the left-handed circular polarized light after passing through the quarter phase delay film, then the left-handed circular polarized light is converted into the right-handed circular polarized light after being reflected by the metal electrode, and when the left-handed circular polarized light passes through the quarter phase delay film, the left-handed circular polarized light is converted into the linear polarized light which is vertical to the original vibration direction, and finally the linear polarized light cannot be absorbed through the linear polarized light plate, so that the anti-reflection effect of eliminating the interference of the external incident light source of the OLED display is achieved, and the problem. However, the conventional quarter-wave retarder is generally capable of performing an ideal retardation correction only for a single wavelength (e.g., a wavelength of green light of 550 nm), and generally has a positive wavelength dispersion characteristic (the longer the wavelength, the smaller the retardation value), so that red and blue light cannot be subjected to an ideal retardation correction, resulting in light leakage.
Disclosure of Invention
The invention aims to provide an ultrathin broadband circular polarizing plate and application thereof, and aims to solve the problem that a traditional quarter-phase retardation film is a positive dispersion film and only can correct phase difference aiming at a single wavelength.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an ultrathin broadband circular polarizing plate, which comprises a linear polarizing plate and a composite quarter-phase retardation film, wherein the linear polarizing plate and the composite quarter-phase retardation film are stacked, and the composite quarter-phase retardation film is a liquid crystal inverse dispersion film; wherein the content of the first and second substances,
the composite quarter-phase retardation film comprises a first phase retardation film and a second phase retardation film which are combined in a laminating way, and the linear polarizer is laminated and arranged on one side of the first phase retardation film far away from the second phase retardation film;
the composite in-plane phase difference value Ro of the composite quarter-phase retardation film is 120nm to 190nm, and an acute angle formed by the optical axis of the composite quarter-phase retardation film and the absorption axis of the linear polarizer is 11 DEG to 21 deg.
The invention also provides an application of the ultrathin broadband circular polarizing plate in the field of optical devices.
And an optical assembly comprising a cholesteric liquid crystal brightness enhancement film and the ultra-thin wide-band circular polarizing plate.
The ultrathin broadband circular polarizing plate comprises the composite quarter-phase retardation film, wherein the composite in-plane phase difference value Ro of the composite quarter-phase retardation film is 120nm to 190nm, and the acute angle formed by the optical axis of the composite quarter-phase retardation film and the absorption axis of the linear polarizing plate is 11 degrees to 21 degrees, so that the composite quarter-phase retardation film is endowed with inverse wavelength dispersion characteristics, namely, the composite quarter-phase retardation film has the characteristic that the longer the wavelength is, the larger the phase difference value is, and the optical characteristics are improved. Compared with the known quarter-phase retardation film with positive dispersion characteristic, the ultrathin broadband circular polarizing plate provided by the invention has good optical characteristics in the visible wavelength range, and can effectively eliminate light reflection. In addition, according to the ultrathin broadband circular polarizing plate provided by the invention, the composite quarter-phase retardation film is a liquid crystal inverse dispersion film, namely the composite quarter-phase retardation film is made of a liquid crystal material, the liquid crystal material has better birefringence, and a functional film can be thinned on the premise of achieving the same optical retardation effect, so that a thin functional product is obtained, and the thinning trend of a display and the flexibility development requirement of a flexible OLED display are met.
The ultrathin broadband circular polarizing plate provided by the invention has reverse wavelength dispersion characteristics, so when the ultrathin broadband circular polarizing plate is used in the field of optical devices, the reflection problem of natural light can be effectively improved in a visible light range, the influence of external environment reflected light is eliminated, and the optical characteristics are improved.
The optical component containing the ultrathin broadband circular polarizing plate provided by the invention can effectively improve the optical effect, improve the light intensifying efficiency and reduce the large-viewing-angle chromatic aberration when being used for a liquid crystal display.
Drawings
FIG. 1 is a schematic structural diagram of an ultra-thin wide-band circular polarizer according to an embodiment of the present invention;
FIG. 2 is a graph showing wavelength dispersion of the composite quarter-phase retardation film provided in example 1, and the quarter-phase retardation films provided in comparative examples 1 and 2;
fig. 3 is a reflectance spectrum of the ultra-thin wide-wavelength circular polarizing plate provided in example 1 of the present invention, and the quarter-phase retardation film-laminated linear polarizing plates provided in comparative examples 1 and 2.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
As shown in fig. 1, an embodiment of the present invention provides an ultra-thin wide-wave-range circular polarizing plate, which includes a linear polarizing plate 30 and a composite quarter-phase retardation film 100, which are stacked, wherein the composite quarter-phase retardation film 100 is a liquid crystal inverse dispersion film; wherein the content of the first and second substances,
the composite quarter-phase retardation film 100 comprises a first phase retardation film 20 and a second phase retardation film 10 which are combined in a laminating way, and the linear polarizer 30 is arranged on the side, away from the second phase retardation film 10, of the first phase retardation film 20 in a laminating way;
the composite in-plane retardation value Ro of the composite quarter-phase retardation film 100 is 120nm to 190nm, and an acute angle formed by the optical axis of the composite quarter-phase retardation film 100 and the absorption axis of the linear polarizer 30 is 11 ° to 21 °.
The ultra-thin wide-wavelength-range circular polarizing plate provided by the embodiment of the invention comprises the composite quarter-phase retardation film 100, wherein the composite in-plane phase difference value Ro of the composite quarter-phase retardation film 100 is 120nm to 190nm, and an acute angle formed by the optical axis of the composite quarter-phase retardation film 100 and the absorption axis of the linear polarizing plate 30 is 11 degrees to 21 degrees, so that the composite quarter-phase retardation film 100 has a reverse wavelength dispersion characteristic, that is, the composite quarter-phase retardation film 100 has a characteristic that the longer the wavelength is, the larger the phase difference value is, and the optical characteristic is improved. Compared with the known quarter-phase retardation film with positive dispersion characteristic, the optical characteristics of the ultrathin broadband circular polarizing plate provided by the embodiment of the invention can have good optical characteristics in the visible wavelength range, and the light reflection can be effectively eliminated. In addition, according to the ultrathin broadband circular polarizing plate provided by the embodiment of the invention, the composite quarter-phase retardation film 100 is a liquid crystal inverse dispersion film, that is, the composite quarter-phase retardation film 100 is made of a liquid crystal material, and the liquid crystal material has good birefringence, so that a functional film can be thinned on the premise of achieving the same optical retardation effect, and thus a thin functional product is obtained, and the requirements of the thinning tendency of a display and the flexibility development of a flexible OLED display are met.
In the embodiment of the present invention, the composite quarter-phase retardation film 100 is a liquid crystal inverse dispersion film, and includes two layers. In one aspect, the composite quarter-phase retardation film 100 is a thin film having reverse wavelength dispersion characteristics, i.e., the longer the wavelength, the larger the phase difference value.
Specifically, in the embodiment of the present invention, the composite quarter-phase retardation film 100 includes a first phase retardation film 20 and a second phase retardation film 10 laminated and combined; and a composite in-plane phase difference value Ro of the composite quarter-phase retardation film 100 is 120nm to 190nm, and an acute angle formed by an optical axis of the composite quarter-phase retardation film 100 and an absorption axis of the linear polarizing plate 30 is 11 ° to 21 °, thereby obtaining an inverse wavelength dispersion characteristic. When the composite in-plane phase difference value Ro of the composite quarter-phase retardation film 100 and the acute angle formed by the optical axis of the composite quarter-phase retardation film 100 and the absorption axis of the linear polarizing plate 30 are not within this range, the inverse wavelength dispersion characteristic cannot be obtained. Here, it is noted that an included angle formed between the optical axis of the composite quarter-phase retardation film 100 and the absorption axis of the linear polarizer 30 may be represented by an acute angle or an obtuse angle. The embodiment of the present invention represents the included angle between the optical axis of the composite quarter-phase retardation film 100 and the absorption axis of the linear polarizer 30 by an acute angle, but also represents the included angle between the optical axis of the composite quarter-phase retardation film 100 and the absorption axis of the linear polarizer 30 by an obtuse angle (the obtuse angle formed by the optical axis of the composite quarter-phase retardation film 100 and the absorption axis of the linear polarizer 30 is 159 ° to 169 °), which is within the protection scope of the present invention.
On the other hand, the composite quarter-phase retardation film 100 is a liquid crystal film, i.e., a film made of a liquid crystal material. The composite quarter-phase retardation film 100 is prepared from other materials, and the obtained film layer is thick, for example, the film layer prepared from a high polymer material has a thickness of 50 μm or more, which is difficult to meet the increasingly better thinning requirements of optical devices on the phase retardation film. In the embodiment of the invention, the composite quarter-phase retardation film 100 is prepared by adopting the liquid crystal material, and the liquid crystal material has better birefringence, so that the functional film can be thinned on the premise of achieving the same optical retardation effect, namely, the thickness of the composite quarter-phase retardation film 100 is reduced, and the composite quarter-phase retardation film 100 can meet the requirement of an optical device on the thinner and thinner phase retardation film. The thickness of the composite quarter-phase retardation film 100 provided by the embodiment of the invention can be as low as 500nm, and specifically, the composite quarter-phase retardation film 100 with the thickness of 500nm to 25 μm can be obtained, and the thickness of the composite quarter-phase retardation film 100 with the thickness is thinner and far lower than that of the inverse dispersion quarter-phase retardation film 100 prepared by a high polymer material, so that the requirement of thinning a display can be met.
Preferably, the materials of the first phase retardation film 20 and the second phase retardation film 10 can be individually selected from rod-shaped liquid crystals, discotic liquid crystals, or rod-shaped liquid crystals doped with chiral molecules, or a combination thereof. The composite quarter-phase retardation film 100 prepared by the above materials can not only endow the composite quarter-phase retardation film 100 with a proper optical axis angle, so as to form a proper angle with the absorption axis of the linear polarizer 30, thereby endowing the composite quarter-phase retardation film 100 with reverse wavelength dispersion characteristics. More preferably, in the chiral molecule doped rod-like liquid crystal, the doping amount of the chiral molecules accounts for 0.005-2% of the total weight of the chiral molecule doped rod-like liquid crystal. If the doping amount of the chiral molecules is too high, the composite quarter-phase retardation film 100 is affected to have a proper optical axis angle, so that an acute angle formed by the optical axis of the composite quarter-phase retardation film 100 and the absorption axis of the linear polarizer 30 exceeds or falls short of an angle range of 11 ° to 21 °, and the composite quarter-phase retardation film 100 with the inverse wavelength dispersion characteristic cannot be obtained.
In one embodiment, the material of the first phase retardation film 20 and the second phase retardation film 10 is selected from rod-shaped liquid crystals LC242 and LC1057 manufactured by BASF corporation, and rod-shaped liquid crystals RMS-03001 and RMS-03011 manufactured by MERCK corporation. In another embodiment, the material of the first phase retardation film 20 and the second phase retardation film 10 is selected from a liquid crystal LC242 or LC1057 manufactured by BASF doped with chiral molecules LC756 manufactured by BASF, or a liquid crystal RMS-03001 manufactured by MERCK doped with chiral molecules LC756 manufactured by BASF.
In the embodiment of the present invention, the first phase retardation film 20 and the second phase retardation film 10 are both liquid crystal films having a positive dispersion characteristic. The liquid crystal film used for the first and second retardation films 20 and 10 according to the embodiment of the present invention may be an a-plate retardation film, a liquid crystal-type O-plate retardation film, or a liquid crystal-type biaxial retardation film. The preferred liquid crystal films have in-plane phase difference, so that the composite film formed by the combination can achieve the effect of inverse dispersion.
As a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are both liquid crystal type a-plate phase retardation films. As a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are both liquid crystal O-plate phase retardation films. As a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are both biaxial phase retardation films of a liquid crystal type. In a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are respectively a liquid crystal type a plate phase retardation film and a liquid crystal type O plate phase retardation film. In a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are respectively a liquid crystal O-plate phase retardation film and a liquid crystal a-plate phase retardation film. In a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are respectively a liquid crystal type a-plate phase retardation film and a liquid crystal type biaxial phase retardation film. In a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are a liquid crystal type biaxial phase retardation film and a liquid crystal type a-plate phase retardation film, respectively. In a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are respectively a liquid crystal O-plate phase retardation film and a liquid crystal biaxial phase retardation film. In a specific implementation case, the first phase retardation film 20 and the second phase retardation film 10 are a liquid crystal type biaxial phase retardation film and a liquid crystal type O-plate phase retardation film, respectively.
In an embodiment of the present invention, a method for preparing the first phase retardation film 20 and/or the second phase retardation film 10 includes:
s01, providing an optical-grade plastic base film and a liquid crystal material, and carrying out alignment treatment on the optical-grade plastic base film.
The material of the optical-grade plastic-based film is not particularly limited, and includes, but is not limited to, triacetyl Cellulose (TAC), polymethyl methacrylate (PMMA), Polycarbonate (PC), Cyclic Olefin Polymer (COP), Acryl (Acryl), Polyvinylidene fluoride (PVDF), polyethylene terephthalate (PET), and polyethylene terephthalate-1, 4-cyclohexanedimethanol (PETG).
The liquid crystal material is as described above and will not be described herein for brevity.
And (3) carrying out alignment treatment on the optical-grade plastic base film, wherein the alignment treatment comprises but is not limited to a rubbing alignment method and a photo-alignment method. Since the optical alignment treatment can arbitrarily adjust the optical axis direction of the liquid crystal molecules, a roll-to-roll process can be used to obtain the first phase retardation film 20 and the second phase retardation film 10 having the desired optical axis direction (e.g., the polymer material is different from the phase retardation film prepared by this method), so that the productivity is better. It should be noted that, when the materials of the first phase retardation film 20 and the second phase retardation film 10 are selected from a rod-shaped liquid crystal doped with chiral molecules, a rubbing alignment method can be used to align the optical axes of the liquid crystal molecules of the first phase retardation film 20 and the second phase retardation film 10, and a desired optical axis angle is achieved through self-assembly adjustment, so as to obtain the composite quarter-phase retardation film 100 with reverse wavelength dispersion characteristics.
S02, depositing the liquid crystal material on the optical-grade plastic base film subjected to alignment treatment, and drying and photocuring the liquid crystal material to obtain the liquid crystal material.
On the basis of the above embodiments, the composite quarter-phase retardation film 100 further includes an adhesive layer. Specifically, an adhesive layer (not shown) is disposed between the first phase retardation film 20 and the second phase retardation film 10, so that the bonding force between the first phase retardation film 20 and the second phase retardation film 10 can be better improved, and the service life of the composite quarter-phase retardation film 100 can be prolonged. The material of the adhesive layer is not critical, and includes, but is not limited to, UV glue, Optically Clear Adhesive (OCA), Liquid Optically Clear Adhesive (LOCA), or Pressure Sensitive Adhesive (PSA). The thickness of the adhesive layer may be selected according to the thickness of the first and second phase retardation films 20 and 10 and the material of the adhesive layer. Specifically, the thickness of the composite quarter-phase retardation film 100 may be between 50nm and 15 μm, and preferably is not more than 25 μm. Even if the inverse dispersion composite quarter-phase retardation film 100 includes an adhesive layer, the thickness is still thin, and the requirement of thinning can be achieved.
The linear polarizing plate 30 is disposed on one side of the composite quarter-phase retardation film, and specifically, the linear polarizing plate 30 is stacked on one side of the first phase retardation film 20 away from the second phase retardation film 10. When the external natural light enters the linear polarizer 30, the light is converted into linearly polarized light, and then the linearly polarized light is processed by the quarter-phase retardation film, so that the interference of the external incident light source is eliminated, and the anti-reflection effect is realized.
Since the optical axis direction of the liquid crystal molecules can be easily adjusted by the optical alignment treatment or the material characteristics (i.e. the chiral molecules doped rod-like liquid crystal) in combination with the rubbing alignment treatment, not only the first phase retardation film 20 and the second phase retardation film 10 with the expected optical axis direction can be obtained by the roll-to-roll process, but also the composite quarter-phase retardation film 100 and the linear polarizer 30 can be manufactured by the roll-to-roll lamination process to obtain the ultra-thin wide-wave-band circular polarizer, so that the ultra-thin wide-wave-band circular polarizer has good productivity.
The invention also provides an application of the ultrathin broadband circular polarizing plate in the field of optical devices.
The ultrathin broadband circular polarizing plate provided by the embodiment of the invention has reverse wavelength dispersion characteristics, so that when the ultrathin broadband circular polarizing plate is used in the field of optical devices, the reflection problem of natural light can be effectively improved in a visible light range, the influence of external environment reflected light is eliminated, and the optical characteristics are improved.
The ultrathin broadband circular polarizing plate provided by the embodiment of the invention can replace the existing optical component to be used in an optical device. The optical device comprises a light emitting diode, a field emission display, a plasma display, a liquid crystal display, a 3D display and 3D glasses. Specifically, the ultrathin broadband circular polarizing plate can be used in self-luminous or non-self-luminous displays such as light emitting diodes, Field Emission Displays (FEDs), Plasma Display Panels (PDPs), Liquid Crystal Displays (LCDs) and the like, can also be used in the technical field of 3D display, and can be particularly applied to 3D displays and 3D glasses. The ultrathin broadband circular polarizing plate provided by the embodiment of the invention can be applied to a light-emitting diode display and can solve the problem of natural light reflection. The light emitting diode includes an Organic Light Emitting Diode (OLED) and a quantum dot light emitting diode (QLED).
The embodiment of the invention also provides an optical assembly, which comprises the cholesterol liquid crystal brightness enhancement film and the ultrathin broadband circular polarizing plate.
The optical component containing the ultrathin broadband circular polarizing plate provided by the embodiment of the invention can effectively improve the optical effect, improve the light intensifying efficiency and reduce the large-viewing-angle chromatic aberration when being used for a liquid crystal display.
The optical component composed of the ultrathin broadband circular polarizing plate and the cholesteric liquid crystal brightness enhancement film can be applied to a liquid crystal display to improve the overall brightness enhancement efficiency and alleviate the problem of large-viewing-angle chromatic aberration. Likewise, the optical assembly provided by the embodiment of the invention can replace the existing corresponding optical assembly and be used for known structures and devices.
The following description will be given with reference to specific examples.
Example 1
A liquid crystal type inverse dispersion composite quarter-phase retardation film is a liquid crystal inverse dispersion film; wherein the composite quarter-phase retardation film comprises a first phase retardation film and a second phase retardation film which are laminated and combined; the composite in-plane phase difference value Ro of the composite quarter-phase retardation film is 120nm to 190 nm.
Example 2
An ultrathin wide-wave-range circular polarizing plate comprises a linear polarizing plate and a composite quarter-phase retardation film which are arranged in a laminated manner, wherein the composite quarter-phase retardation film is a liquid crystal inverse dispersion film; the composite quarter-phase retardation film comprises a first phase retardation film and a second phase retardation film which are combined in a laminating way, and the linear polarizer is laminated and arranged on one side of the first phase retardation film far away from the second phase retardation film; the composite in-plane phase difference value Ro of the composite quarter-phase retardation film is 120nm to 190nm, and an acute angle formed by the optical axis of the composite quarter-phase retardation film and the absorption axis of the linear polarizer is 11 DEG to 21 deg.
Comparative example 1
A quarter-phase retardation film (hereinafter referred to as a known quarter-phase retardation film 1) is a single-layer film made of a polymer extended quarter-phase retardation film model GR125 manufactured by imperial corporation.
Comparative example 2
A quarter-phase retardation film (hereinafter referred to as a known quarter-phase retardation film 2) is a single-layer film made of a polymer extended quarter-phase retardation film of type RM147 manufactured by imperial corporation.
The wavelength dispersion of the liquid crystal type inverse dispersion composite quarter-phase retardation film 100 provided in example 1 and the quarter-phase retardation films provided in comparative examples 1 and 2 was compared, and the wavelength dispersion is shown in fig. 2. Wherein the horizontal axis is wavelength; the longitudinal axis is the in-plane phase difference value Ro; the measuring device is a phase difference measuring instrument (model: KOBRA-WPR, manufactured by prince measuring Co., Ltd.) having a wavelength range of 400nm to 700 nm. From fig. 2, the in-plane retardation value Ro of the liquid crystal type inverse dispersion complex type quarter-phase retardation film 100 of example 1 was 155nm (at a wavelength of 550 nm). The quarter-phase retardation film 1, the quarter-phase retardation film 2, and the liquid crystal type inverse dispersion composite quarter-phase retardation film 100 of example 1 are known to satisfy the desired linear in-plane retardation value Ro at a wavelength of about 550 nm. However, the known quarter-phase retardation film 1 provided in comparative example 1 has a linear in-plane phase difference value Ro that decreases with longer wavelength (i.e., positive wavelength dispersion characteristic), exhibiting a tendency opposite to the ideal wavelength dispersion, so that the known quarter-phase retardation film 1 cannot satisfy the phase difference value that is ideal for wavelengths other than 550 nm. The conventional quarter-phase retardation film 2 and the liquid crystal type inverse dispersion composite quarter-phase retardation film 100 of example 1 provided in comparative example 2 both have inverse wavelength dispersion characteristics with a tendency similar to ideal wavelength dispersion, and therefore, both the conventional quarter-phase retardation film 2 and the liquid crystal type inverse dispersion composite quarter-phase retardation film 100 can approach ideal phase difference values in the visible wavelength range, compared to the conventional quarter-phase retardation film 1.
The known quarter-phase retardation film 1 provided in comparative example 1 and the known quarter-phase retardation film 2 provided in comparative example 2 were respectively bonded to a linear polarizing plate, and then respectively bonded to a mirror surface with the ultrathin broadband circular polarizing plate provided in example 2 of the present invention, and a reflectance test was performed, wherein a reflectance spectrum is shown in fig. 3. Wherein the horizontal axis is wavelength; the longitudinal axis is the reflectivity R%; the measuring apparatus was a UV/Vis spectrometer (manufactured by Hitachi, model: U4100) having a wavelength range of 350nm to 700 nm. As can be seen from fig. 3, since the quarter-phase retardation film 1 is known to have a positive wavelength dispersion characteristic, and exhibits a tendency opposite to the ideal wavelength dispersion, the quarter-phase retardation film 1 cannot satisfy the ideal phase difference value at other wavelengths than the wavelength of 550nm, and therefore, the anti-reflection effect is poor (the reflectance R% is maximum). The conventional quarter-phase retardation film 2 provided in the comparative example 2 and the liquid crystal type inverse dispersion composite quarter-phase retardation film 100 provided in the embodiment 1 of the present invention both have inverse wavelength dispersion characteristics, which are similar to the trend of ideal wavelength dispersion, so that the conventional quarter-phase retardation film 2 and the liquid crystal type inverse dispersion composite quarter-phase retardation film 100 can approach to ideal phase difference values in the visible wavelength range, and thus can obtain better anti-reflection effect (smaller reflectance R%) compared to the conventional quarter-phase retardation film 1. In embodiment 2 of the present invention, the ultra-thin wide-wavelength circular polarizing plate composed of the liquid crystal type inverse dispersion composite quarter-phase retardation film and the linear polarizing plate has a reflectance of 4% to 6% in the visible light wavelength region (400nm to 700nm), that is, the ultra-thin wide-wavelength circular polarizing plate provided by the embodiment of the present invention has a good anti-reflection effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The ultrathin wide-wave-range circular polarizing plate is characterized by comprising a linear polarizing plate and a composite quarter-phase retardation film which are arranged in a laminating manner, wherein the composite quarter-phase retardation film is a liquid crystal inverse dispersion film; wherein the content of the first and second substances,
the composite quarter-phase retardation film comprises a first phase retardation film and a second phase retardation film which are combined in a laminating way and have positive dispersion characteristics, and the linear polarizer is arranged on one side of the first phase retardation film far away from the second phase retardation film in a laminating way;
the composite in-plane phase difference value R of the composite quarter-phase retardation filmo120nm to 190nm, and an acute angle formed by an optical axis of the composite quarter-phase retardation film and an absorption axis of the linear polarizing plate is 11 DEG to 21 DEG;
the ultrathin broadband circular polarizing plate has a reflectivity of 4% to 6% within a wavelength range of 400nm to 700 nm;
the first phase retardation film and the second phase retardation film are both liquid crystal type A plate phase retardation films; or
The first phase retardation film and the second phase retardation film are both liquid crystal type O-plate phase retardation films; or
The first phase retardation film and the second phase retardation film are both liquid crystal type biaxial phase retardation films; or
The first phase retardation film and the second phase retardation film are respectively a liquid crystal type A plate phase retardation film and a liquid crystal type O plate phase retardation film; or
The first phase retardation film and the second phase retardation film are respectively a liquid crystal O-plate phase retardation film and a liquid crystal A-plate phase retardation film; or
The first phase retardation film and the second phase retardation film are respectively a liquid crystal type A plate phase retardation film and a liquid crystal type biaxial phase retardation film; or
The first phase retardation film and the second phase retardation film are respectively a liquid crystal type biaxial phase retardation film and a liquid crystal type A plate phase retardation film; or
The first phase retardation film and the second phase retardation film are respectively a liquid crystal O-plate phase retardation film and a liquid crystal biaxial phase retardation film; or
The first phase retardation film and the second phase retardation film are respectively a liquid crystal type biaxial phase retardation film and a liquid crystal type O-plate phase retardation film.
2. The ultra-thin wide-band circular polarizing plate of claim 1, wherein the composite quarter-phase retardation film has a thickness of 500nm to 25 μm.
3. The ultra-thin wide-band circularly polarizing plate of claim 1 or 2, wherein the material of the first phase retardation film and the second phase retardation film is selected from rod-shaped liquid crystal, discotic liquid crystal, or rod-shaped liquid crystal doped with chiral molecules.
4. The ultra-thin wide-wavelength-band circularly polarizing plate of claim 3, wherein the chiral molecule-doped rod-like liquid crystal comprises 0.005% to 2% by weight of chiral molecules based on the total weight of the chiral molecule-doped rod-like liquid crystal.
5. The ultra-thin wide wave band circular polarizing plate of claim 1 or 2, wherein an adhesive layer is provided between the first phase retardation film and the second phase retardation film.
6. An application of an ultra-thin wide-wave-range circular polarizing plate in the field of optical devices, wherein the ultra-thin wide-wave-range circular polarizing plate is the ultra-thin wide-wave-range circular polarizing plate according to any one of claims 1 to 5.
7. The use of claim 6, wherein the optical device comprises a light emitting diode, a field emission display, a plasma display, a liquid crystal display, a 3D display, 3D glasses.
8. An optical member comprising a cholesteric liquid crystal brightness enhancing film and the ultra-thin wide-wavelength circularly polarizing plate according to any one of claims 1 to 5.
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| CN110610664B (en) * | 2019-09-25 | 2021-11-30 | 云谷（固安）科技有限公司 | Cover plate with polarization function, flexible display panel and rollable display device |
| CN110908030A (en) * | 2019-11-08 | 2020-03-24 | 浙江怡诚光电科技有限公司 | Circular polarizing plate, preparation method thereof and display |
| CN110927855A (en) * | 2019-11-15 | 2020-03-27 | 浙江怡诚光电科技有限公司 | 3D display device, patterned circular polarizing plate and preparation method |
| CN110927857A (en) * | 2019-12-14 | 2020-03-27 | 浙江怡诚光电科技有限公司 | Circular polarizing plate with brightening function for OLED display and application thereof |
| CN111367127B (en) * | 2020-03-16 | 2023-03-28 | Tcl华星光电技术有限公司 | Liquid crystal film structure, preparation method thereof and liquid crystal display panel |
| CN111552097B (en) * | 2020-07-13 | 2020-10-16 | 南京微纳科技研究院有限公司 | Glasses, eye imaging method and device, electronic equipment and storage medium |
| CN116299826A (en) * | 2023-03-01 | 2023-06-23 | 浙江怡钛积科技有限公司 | Optical plate, optical application piece and simulation generation method of optical plate |
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| JP4285467B2 (en) * | 1999-12-03 | 2009-06-24 | セイコーエプソン株式会社 | Liquid crystal device and electronic device |
| CN107621666A (en) * | 2016-07-13 | 2018-01-23 | 鼎茂光电股份有限公司 | Ultra-thin wide-wave-range phase retardation film |
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| JP4285467B2 (en) * | 1999-12-03 | 2009-06-24 | セイコーエプソン株式会社 | Liquid crystal device and electronic device |
| CN107621666A (en) * | 2016-07-13 | 2018-01-23 | 鼎茂光电股份有限公司 | Ultra-thin wide-wave-range phase retardation film |
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