CN113504596A - Wide-viewing-angle composite polarizer - Google Patents
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- CN113504596A CN113504596A CN202110727429.0A CN202110727429A CN113504596A CN 113504596 A CN113504596 A CN 113504596A CN 202110727429 A CN202110727429 A CN 202110727429A CN 113504596 A CN113504596 A CN 113504596A
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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
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
- G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
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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
- G02B5/3016—Polarising elements involving passive liquid crystal elements
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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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Abstract
The invention relates to a wide-viewing angle composite polarizer. The composite polaroid comprises the following components: the optical path is sequentially provided with a first polarizing layer, an optical rotation layer and a second polarizing layer; the light rotating angle of the light rotating layer is the same as or complementary to the included angle between the light transmission axes of the first and second polarizing layers; the included angle between the light transmission axes of the first polarizer and the second polarizer ranges from 45 degrees to 135 degrees. The composite polarizer forms a composite polarizer with polarization effect through the arrangement of two polarizing layers which are sequentially combined by the first polarizing layer, the optical rotating layer and the second polarizing layer. Compared with the prior polarizer, the invention has uniform and consistent transmittance at different azimuth angles, and can solve the problem of brightness change caused by the use of the polarizer in an organic light-emitting display device.
Description
Technical Field
The invention relates to the technical field of polaroids, in particular to a wide-viewing-angle composite polaroid. The method can be applied to display devices to reduce brightness variation of different viewing angles.
Background
Polarizers are basic optical devices that can be used to convert natural light into polarized light, and can also be used to selectively transmit polarized light of different polarization states. Polarizers are widely used in a variety of display devices including liquid crystal displays, organic light emitting displays, and the like. In liquid crystal display, a polarizer and a liquid crystal layer constitute an optical switch for realizing a display function. In an active light emitting display device such as an organic light emitting display, a polarizer is used to reduce reflection of ambient light. In 3D displays, polarizers are used to generate polarized light. The performance of the polarizer directly affects the display effect of the display device. The conventional polarizer mainly includes a metal polarizer, an iodine polarizer, a dye polarizer and a polyethylene polarizer. For any type of polarizer, the realization of its polarizing effect relies on the alignment of molecules/clusters having optical anisotropy. Taking an iodine-based polarizer commonly used in a display device as an example, the polarizing effect is achieved by iodine ions aligned on a polyvinyl alcohol film. When light passes through the polarizer, linearly polarized light with the polarization direction along the arrangement direction of the iodine ions is absorbed, and emergent light is linearly polarized light. In the polarizer, the polarization direction of the absorbed polarized light is referred to as the absorption axis direction, the polarization direction of the emitted light is referred to as the transmission axis direction, and the absorption axis is orthogonal to the transmission axis direction.
Since the function of the polarizer is derived from an anisotropic structure, the monolithic polarizer has different transmittances at different viewing angles. When the incident angle reaches 45 °, the transmittance difference of the conventional polarizer at different azimuthal angles is about 20%. And when the incident angle is increased to 75 degrees, the transmittance difference of different azimuth angles is as high as 60 percent. In the organic light emitting display device, the viewing angle characteristics of the polarizer are visually embodied. In the organic light emitting display device, only one circular polarizer is used to reduce reflection, so the viewing angle characteristics of the polarizer greatly affect the display brightness at different viewing angles. Even though the light emitting uniformity of the light emitting components in the organic light emitting display device is better than that of the backlight source in the liquid crystal display device, the organic light emitting display device still has inferior display luminance uniformity to the liquid crystal display device at different viewing angles. The problem that the transmittance of the polarizer is not uniform under different viewing angles greatly affects the display effect of the display device. At present, the research on the viewing angle of the polarizer mainly focuses on optimizing the contrast of two orthogonal polarizers at different viewing angles. The light leakage of the two orthogonal polarizers at an oblique viewing angle can be reduced by adding the compensation film in the structure of the polarizers, so that the contrast at the oblique viewing angle is increased. For example, the contrast at oblique viewing angles is increased by adding a compensation film structure (chinese patent CN202010253314.8 entitled "a polarizer for a wide viewing angle liquid crystal display"). In essence, the problem of non-uniform transmittance of the conventional polarizer at different viewing angles is caused by the structural characteristics of the polarizer. The polarizing layer which plays a role in polarizing can be regarded as a two-dimensional plane consisting of a plurality of one-dimensional structures, and observation under different visual angles is carried out in a three-dimensional space, and the structures of the polarizing layer show obvious difference under different visual angles. When the polar angles are the same, the projections of the absorption axis composed of iodide ions and the transmission axis of the polarizing layer at different azimuth angles are completely different. The structural characteristics of a polarizing layer in the polarizer cannot be changed by adding additional structures such as a compensation film in the polarizer, and the structure of the polarizing layer of the conventional polarizer is still two-dimensional, so that the problem of uneven transmittance still exists under different viewing angles. Up to now, the transmittance of the polarizer at different viewing angles is still not uniform. In order to solve the problem of uneven transmittance of the polarizer at different viewing angles, the projections of the transmission axes in the polarizing layer at different viewing angles need to be consistent, which means that the polarizing layer needs to include a three-dimensional structure with symmetry in a three-dimensional space. However, the anisotropic two-dimensional structure of the polarizing layer is the basis for realizing the polarizing effect, and the polarizing effect of the polarizing layer is greatly influenced by changing the structure of the polarizing layer. The design of a polarizer with a symmetrical three-dimensional structure and an ideal polarization effect faces many problems, on one hand, the structural limitation of the polarizer is broken, the two-dimensional structure is converted into the three-dimensional structure, and on the other hand, the symmetry in a three-dimensional space is realized while the two-dimensional anisotropic structure in the polarizer is kept. A wide viewing angle polarizer with uniform transmittance at different viewing angles has great application prospects and is also a great challenge.
Disclosure of Invention
The invention provides a wide-viewing-angle composite polarizer, aiming at the problem that the transmittance of the conventional polarizer is not uniform under different viewing angles. The composite polarizer is formed by sequentially combining a first polarizing layer, a light rotating layer and a second polarizing layer, and forms the composite polarizer with a polarizing function. In the invention, the two polarizing layers are in different planes and have different light transmission axis directions, the projections of a three-dimensional structure formed by the light transmission axes in the two polarizing layers under different viewing angles have strong consistency, and the design of the optical rotation layer eliminates the influence on the polarizing effect due to the structural change of the polarizing layer, so that the invention has uniform transmittance and simultaneously has ideal polarizing effect under different viewing angles. Compared with the prior polarizer, the invention has uniform and consistent transmittance at different azimuth angles, and can be applied to an organic light-emitting display device to reduce the brightness change at different viewing angles.
The technical scheme of the invention is as follows:
a wide viewing angle composite polarizer, characterized in that the composition of the polarizer is: the optical path is sequentially provided with a first polarizing layer, an optical rotation layer and a second polarizing layer;
the included angle between the light transmission axes of the first polarizing layer and the second polarizing layer ranges from 45 degrees to 135 degrees;
the light rotating angle of the light rotating layer is the same as or complementary to the included angle between the light transmission axes of the first and second polarizing layers.
Optionally, the optical rotation layer is a liquid crystal optical rotation layer or a combined wave plate optical rotation layer.
The polarizing layer includes but is not limited to an absorptive polarizer, a polarization selector, a metal wire grid or a reflective polarizer;
the liquid crystal optical rotating layer is made of a liquid crystal material or a liquid crystal polymer material.
The twist angle of liquid crystal molecules in the liquid crystal optical rotating layer is the same as or complementary to the included angle between the light transmission axes of the first polarizing layer and the second polarizing layer.
The combined wave plate rotating layer is composed of 2-20 wave plates, and the slow axis direction of the wave plates is in left-handed or right-handed twisted arrangement.
The included angle between the slow axes of the adjacent wave plates in the optical rotation layer of the combined wave plate is less than or equal to 60 degrees.
The invention has the substantive characteristics that:
the prior polarizer only comprises one polarizing layer, and the projections of the transmission axes of the polarizing layer under different viewing angles are obviously different, so the transmittances under different viewing angles are obviously different, and when the incident angle is 75 degrees, the transmittance difference under different azimuth angles is up to 60 percent. The wide-viewing-angle composite polarizer provided by the invention creatively uses two polarizing layers with different transmission axis directions, and is provided with the light rotating layer, and the projections of a three-dimensional structure formed by the transmission axes of the two polarizing layers in the polarizer under different viewing angles have consistency, so that the wide-viewing-angle composite polarizer has uniform transmittance under different viewing angles.
The invention has the beneficial effects that:
the wide-viewing-angle composite polarizer provided by the invention has more uniform transmittance under different viewing angles, and the transmittance change under different azimuth angles is only one fifth of that of the traditional polarizer. When the invention is applied to display devices such as organic light emitting display devices, the brightness variation of the display devices at different azimuth angles can be reduced by 80%.
Drawings
FIG. 1 is a schematic diagram of a reference system for observing the transmittance of a polarizer at different viewing angles;
FIG. 2 is a schematic cross-sectional view of a wide viewing angle composite polarizer according to the present invention;
fig. 3 is a schematic cross-sectional structure diagram of a wide-viewing-angle composite polarizer according to embodiment 1 of the present invention;
FIG. 4 is a cross-sectional view of the liquid crystal layer of FIG. 3;
FIG. 5 is a schematic view showing the directions of transmission axes on both sides of a wide viewing angle composite polarizer;
FIG. 6 is a schematic diagram of the polarization state change of incident light passing through a wide viewing angle composite polarizer;
FIG. 7 is a schematic diagram of transmittance change of a conventional iodine-based polarizer at different viewing angles;
fig. 8 is a schematic diagram illustrating transmittance changes of a wide-viewing-angle composite polarizer provided in embodiment 1 of the present invention at different viewing angles;
fig. 9 is a graph showing luminance variations at different viewing angles of an organic light emitting display device using a conventional iodine-based polarizer;
fig. 10 is a graph showing luminance variations at different viewing angles of an organic light emitting display device using the wide viewing angle composite polarizer provided in example 1 of the present invention;
fig. 11 is a schematic cross-sectional structure view of a wide-viewing-angle composite polarizer according to embodiment 2 of the present invention;
FIG. 12 is a structural formula of three monomers constituting an optically active layer of the liquid crystal polymer in FIG. 9;
fig. 13 is a schematic diagram illustrating transmittance changes of a wide-viewing-angle composite polarizer provided in embodiment 2 of the present invention at different viewing angles;
fig. 14 is a schematic cross-sectional view of a wide-viewing-angle composite polarizer according to embodiment 3 of the present invention;
fig. 15 is a schematic diagram illustrating transmittance changes of a wide-viewing-angle composite polarizer provided in embodiment 3 of the invention at different viewing angles.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Example 1
FIG. 1 is a schematic diagram of a reference system for observing the transmittance of different viewing angles of a polarizer, referring to FIG. 1, an included angle between a line of sight and a Z axis is a polar angle θ, and an included angle between a projection of the line of sight on an XY plane and an X axis is an azimuth angle
. In the XY plane, the X-axis direction is defined as a 0 ° direction.
Fig. 2 is a schematic cross-sectional view of a wide viewing angle composite polarizer according to the present invention, which includes a first polarizing layer 10, an optical rotation layer 30, and a second polarizing layer 20.
Fig. 3 is a schematic cross-sectional structure diagram of a wide-viewing-angle composite polarizer according to embodiment 1 of the present invention, fig. 4 is a schematic cross-sectional structure diagram of a liquid crystal layer in fig. 3, fig. 5 is a schematic cross-sectional structure diagram of transmission axes at two sides of the wide-viewing-angle composite polarizer, fig. 6 is a schematic cross-sectional view of a polarization state change when incident light passes through the wide-viewing-angle composite polarizer, and in combination with fig. 3, fig. 4, fig. 5, and fig. 6, an extending direction of a double-headed arrow in fig. 5 indicates the transmission axes at two sides of the wide-viewing-angle composite polarizer. The transmission axes on the two sides of the wide-view-angle composite polaroid are respectively along the 0-degree direction and the 90-degree direction.
The composite wide-viewing-angle polarizer sequentially comprises a first polarizing layer 10, a liquid crystal optical rotation layer 30 and a second polarizing layer 20 from bottom to top, wherein the first polarizing layer 10 and the second polarizing layer 20 are iodine polarizing plates, and the liquid crystal optical rotation layer 30 is a liquid crystal box;
the first and second polarizing layers are iodine-based polarizers.
The thicknesses of the first and second polarizing layers are 80 microns.
The liquid crystal optical rotation layer 30 sequentially comprises a lower glass substrate 301, a lower orientation layer 302, a liquid crystal layer 303, an upper orientation layer 304 and an upper glass substrate 305 from bottom to top;
the light transmission axis direction of the first polarizing layer 10 is along the 0 ° direction, the light transmission axis of the second polarizing layer 20 is along the 90 ° direction, and the liquid crystal layer 303 includes a first surface 3031 near the first polarizing layer side and a second surface 3032 near the second polarizing layer side.
As shown in fig. 4, the liquid crystal molecular director of the first surface 3031 (i.e., the surface of the liquid crystal layer adjacent to the first polarizing layer) is in the 0 ° direction and the liquid crystal molecular director of the second surface 3032 (i.e., the surface of the liquid crystal layer adjacent to the second polarizing layer) is in the 90 ° direction. The director of the liquid crystal molecules in the liquid crystal layer 303 is uniformly twisted by 90 deg. in the direction perpendicular to the liquid crystal layer 303.
In the wide viewing angle composite polarizer provided in the present embodiment. The incident light I is converted into linearly polarized light P1 having a polarization direction along the 0 ° direction after passing through the first polarizing layer 10; when linearly polarized light P1 passes through the liquid crystal optical rotation layer 30, the polarization direction is rotated by 90 degrees, the liquid crystal optical rotation layer cannot realize ideal polarization rotation, and emergent light P2 passing through the liquid crystal optical rotation layer 30 is approximate to linearly polarized light with the polarization direction along the 90-degree direction; the P2 becomes linearly polarized light P3 with a polarization direction along 90 ° after passing through the second polarizing layer 20. When the viewing angle is inclined, the transmittance of the wide-viewing-angle composite polarizer provided by the invention is determined by the first polarizing layer and the second polarizing layer. The light transmission axes of the first and second polarizing layers are orthogonal, so that the transmittances of the two polarizing layers at different viewing angles can be mutually compensated, and uniform transmittance can be obtained at different viewing angles.
FIG. 7 is a schematic diagram of transmittance change of a conventional iodine-based polarizer at different viewing angles, wherein a transmission axis of the polarizer is along a 90 ° direction during observation. Referring to fig. 1 and 7, the abscissa is the azimuth angle
And the ordinate represents transmittance. The 6 curves in fig. 7 correspond to 6 different polar angles, respectively: 0 °, 15 °, 30 °, 45 °, 60 °, and 75 °. That is, the transmittance of the conventional polarizer to natural light was measured at 0 °, 15 °, 30 °, 45 °, 60 °, and 75 °, respectively. As the polar angle is increased, the transmittance of the polarizer at different azimuth angles shows obvious difference. When the polar angle is 45 °, the difference in transmittance at different azimuths is 16%. When the polar angle is 60 °, the difference in transmittance at different azimuthal angles is 32%. When the polar angle is 75 °, the difference in transmittance at different azimuths is 60%.
Fig. 8 is a schematic diagram of transmittance changes of the wide-viewing-angle composite polarizer provided in embodiment 1 under different viewing angles, and a transmission axis of the polarizing layer on an incident side is along a 90 ° direction during observation. Referring to fig. 1 and 8, the abscissa is the azimuth angle
And the ordinate represents transmittance. The 6 curves in fig. 8 correspond to 6 different polar angles, respectively: 0 °, 15 °, 30 °, 45 °, 60 °, and 75 °. That is, the transmittance of example 1 to natural light was measured at θ ═ 0 °, θ ═ 15 °, θ ═ 30 °, θ ═ 45 °, θ ═ 60 °, and θ ═ 75 °, respectively. Here, the transmittance of the polarizer for monochromatic light having a wavelength of 550nm at different viewing angles was tested using a spectrometer. At any polar angle, the transmittance of example 1 at different azimuthal angles did not change significantly. When the polar angle is 45 °, the difference in transmittance at different azimuths is 0.6%. When the polar angle is 60 °, the difference in transmittance at different azimuth angles is 3.7%. When the polar angle is 75 degrees, the transmittance difference of different azimuth angles is 12.5% of the total weight of the composition. Compared with the traditional polaroid, the wide-view-angle composite polaroid provided by the invention has more uniform transmittance under different viewing angles.
Fig. 9 is a graph showing luminance variations at different viewing angles of an organic light emitting display device using a conventional iodine-based polarizer, and fig. 10 is a graph showing luminance variations at different viewing angles of an organic light emitting display device using a wide viewing angle composite polarizer provided in example 1 of the present invention, in which luminance at a front viewing angle is defined as 1. Referring to fig. 9 and 10, when the viewing angle is tilted, the luminance variation of the organic light emitting display device using the conventional iodine-based polarizer is very significant at different azimuth angles, and the luminance variation of the organic light emitting display device using the wide viewing angle composite polarizer provided in example 1 of the present invention is significantly reduced at different azimuth angles. At a polar angle of 75 degrees, the luminance variation of the organic light emitting display device using the conventional iodine-based polarizer at different azimuth angles was 60%, and the luminance variation of the organic light emitting display device using the wide viewing angle composite polarizer provided in example 1 of the present invention at different azimuth angles was only 12.5%.
Example 2
Fig. 11 is a schematic cross-sectional structure view of a wide viewing angle composite polarizer according to embodiment 2 of the present invention, fig. 12 is a structural diagram of three monomers constituting a liquid crystal polymer light-rotating layer in fig. 11, and referring to fig. 11 and 12, the composite wide viewing angle polarizer includes a first polarizing layer 10, a liquid crystal light-rotating layer 40, and a second polarizing layer 20, wherein the first polarizing layer 10 and the second polarizing layer 20 are iodine-based polarizers, and the liquid crystal light-rotating layer 40 is a liquid crystal polymer composed of three monomers, HCM-021, HCM-020, and HCM-009 (the monomers are purchased from jiangsu and cheng display technologies). The liquid crystal optically rotating layer 40 comprises a lower substrate 401 and a liquid crystal polymer layer 402, wherein the lower substrate 401 has a thickness of 1 micrometer and the liquid crystal polymer layer 402 has a thickness of 5 micrometers. The light transmission axis of the first polarizing layer 10 is oriented along 0 DEG, the light transmission axis of the second polarizing layer 20 is oriented along 90 DEG, and the liquid crystal polymer layer 402 includes a first surface 4021 adjacent to the first polarizing layer side and a second surface 4022 adjacent to the second polarizing layer side. The liquid crystal molecular director of the first surface 4021 is along the 90 ° direction, and the liquid crystal molecular director of the second surface 4022 is along the 0 ° direction. The director of the liquid crystal molecules in the liquid crystal polymer layer 402 is uniformly twisted by-90 deg. in the direction perpendicular to the liquid crystal polymer layer 402. In example 1, the director direction of the liquid crystal molecules near the surface of the polarizing layer is parallel to the transmission axis direction of the polarizer, and in example 2, the director direction of the liquid crystal molecules near the surface of the polarizing layer is orthogonal to the transmission axis direction of the polarizer. In this case, the optical rotation characteristics of the liquid crystal optical rotation layer were not changed, and example 2 exhibited characteristics similar to those of example 1.
Fig. 13 is a schematic diagram of transmittance changes of the wide-viewing-angle composite polarizer provided in embodiment 2 of the present invention at different viewing angles, when a transmission axis of the polarizing layer at an incident side is along a 90 ° direction. Referring to fig. 1 and 13, the abscissa is the azimuth angle
And the ordinate represents transmittance. The 6 curves in fig. 13 correspond to 6 different polar angles, respectively: 0 °, 15 °, 30 °, 45 °, 60 °, and 75 °. That is, the transmittance of example 2 to natural light was measured at θ ═ 0 °, θ ═ 15 °, θ ═ 30 °, θ ═ 45 °, θ ═ 60 °, and θ ═ 75 °, respectively. At any polar angle, the transmittance of example 2 at different azimuthal angles did not change significantly. Compared with the traditional polaroid, the wide-view-angle composite polaroid provided by the invention has more uniform transmittance under different viewing angles.
The present embodiment differs from embodiment 1 in two ways. First, the material of the liquid crystal optically active layer in example 2 is a liquid crystal polymer, and the material of the liquid crystal optically active layer in example 1 is a liquid crystal. Second, the liquid crystal molecular director at the surface of the liquid crystal layer in example 2 is orthogonal to the transmission axis direction of the same-side polarizer, and the molecular director at the surface of the liquid crystal layer in example 1 is parallel to the transmission axis direction of the same-side polarizer. The final results are similar when the liquid crystal optical rotation layer is made of liquid crystal or liquid crystal polymer materials, and the final results are similar when the liquid crystal molecular director at the surface of the liquid crystal layer is orthogonal or parallel to the transmission axis direction of the polarizer at the same side. The use of different materials and different structures to achieve similar results in accordance with the requirements of the invention is illustrated by two different embodiments.
Example 3
Fig. 14 is a schematic cross-sectional view illustrating a wide viewing angle composite polarizer according to embodiment 3 of the present invention, wherein the composite wide viewing angle polarizer includes a first polarizing layer 10, a combined wave plate rotating layer 50 and a second polarizing layer 20, wherein the first polarizing layer 10 and the second polarizing layer 20 are iodine-based polarizers, the combined wave plate rotating layer 50 is a multi-layer combined wave plate, and the wave plate is an R138 polymer wave plate (purchased from third-lipped spectroscopy, electro-optical technology, ltd.). The combined wave plate optical rotation layer comprises a first wave plate 501, a second wave plate 502, a third wave plate 503, a fourth wave plate 504, a fifth wave plate 505, a sixth wave plate 506, a seventh wave plate 507, an eighth wave plate 508 and a ninth wave plate 509 which are made of the same material and have the same thickness. The light transmission axis direction of the first polarizing layer 10 is along the 0-degree direction, the light transmission axis direction of the second polarizing layer 20 is along the 90-degree direction, the slow axis directions of the nine wave plates are sequentially 0 degrees, 10 degrees, 20 degrees, 30 degrees, 40 degrees, 50 degrees, 60 degrees, 70 degrees, 80 degrees and 90 degrees, the included angle between the slow axes of the adjacent wave plates is 10 degrees, and the slow axes of the wave plates are twisted in a right-handed mode. The combined wave plate optical rotatory layer 50 can perform an optical rotatory action similar to that of the twisted nematic liquid crystal layer, and example 3 exhibits characteristics similar to those of example 1.
Fig. 15 is a schematic diagram of transmittance changes of the wide-viewing-angle composite polarizer provided in embodiment 3 of the present invention at different viewing angles, when a transmission axis of the polarizing layer at an incident side is along a 90 ° direction. Referring to fig. 1 and 15, the abscissa is the azimuth angle
And the ordinate represents transmittance. The 6 curves in fig. 15 correspond to 6 different polar angles, respectively: 0 °, 15 °, 30 °, 45 °, 60 °, and 75 °. That is, the transmittance of example 3 for natural light was measured at θ ═ 0 °, θ ═ 15 °, θ ═ 30 °, θ ═ 45 °, θ ═ 60 °, and θ ═ 75 °, respectively. At any polar angle, the transmittance of example 3 at different azimuthal angles did not change significantly. Compared with the traditional polaroid, the wide-view-angle composite polaroid provided by the invention has more uniform transmittance under different viewing angles.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
The invention is not the best known technology.
Claims (6)
1. A wide viewing angle composite polaroid is characterized in that the polaroid consists of a first polarizing layer, a light rotating layer and a second polarizing layer which are arranged on an optical path in sequence;
the included angle between the light transmission axes of the first polarizing layer and the second polarizing layer ranges from 45 degrees to 135 degrees;
the light rotating angle of the light rotating layer is the same as or complementary to the included angle between the light transmission axes of the first and second polarizing layers.
2. The wide viewing angle composite polarizer according to claim 1, wherein the optically active layer is a liquid crystal optically active layer or a combined wave plate optically active layer.
3. The wide viewing angle composite polarizer according to claim 2, wherein the constituent material of said liquid crystal polarizing layer is a liquid crystal material or a liquid crystal polymer material.
4. The wide viewing angle composite polarizer according to claim 3, wherein the twist angle of the liquid crystal molecules in said liquid crystal optically rotating layer is the same as or complementary to the angle between the transmission axes of the first and second polarizing layers.
5. The wide viewing angle composite polarizer according to claim 2, wherein the combined wave plate rotating layer is composed of 2-20 wave plates, and the slow axis direction of the wave plates is in a left-handed or right-handed twisted arrangement.
6. The wide viewing angle composite polarizer according to claim 5, wherein the angle between the slow axes of adjacent wave plates in the optically active layer of said combined wave plate is 60 degrees or less.
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| CN108490681A (en) * | 2018-07-06 | 2018-09-04 | 河北工业大学 | A kind of liquid crystal material colour gamut widens device |
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