CN110927855A - 3D display device, patterned circular polarizing plate and preparation method - Google Patents
3D display device, patterned circular polarizing plate and preparation method Download PDFInfo
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Abstract
The invention belongs to the technical field of 3D display, and particularly relates to a 3D display device, which comprises: the display device comprises a display device and a patterned circular polarizing plate arranged on the display device, wherein the patterned circular polarizing plate comprises a linear polarizing plate and a patterned liquid crystal type quarter-phase retardation film which are sequentially stacked; wherein the linear polarizer is disposed at a side close to the display device; the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, and the optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and the absorption axis of the linear polarizing plate form an included angle of plus 45 degrees +/-1 degrees or a minus 45 degrees +/-1 degrees respectively. The 3D display device provided by the invention can generate a better 3D stereoscopic image effect only by matching the patterned circular polarizing plate on the display equipment.
Description
Technical Field
The invention belongs to the technical field of 3D display, and particularly relates to a 3D display device, a patterned circular polarizing plate for the 3D display device and a preparation method thereof.
Background
The 3D stereoscopic display technology can be mainly divided into two major categories, one is glasses-free, and the other is glasses-type. Generally, the conventional naked eye technology has problems of poor image resolution, difficulty in achieving multiple viewing angles and the like, so that the image quality is poor and the viewing position is limited; the glasses type 3D stereoscopic display technology requires additional 3D glasses, but has the advantages of wide viewing angle and capability of being watched by multiple people. In the glasses type technology, the polarized glasses technology is mature, and the glasses have the advantages of low cost and convenient wearing in manufacturing, and can improve the image flicker problem of the shutter glasses. The existing polarized glasses technology needs to use a thin film unit capable of changing the polarization state of the left eye image and the right eye image, and the thin film unit generally uses a patterned polarizer or a phase difference plate corresponding to the image display units in a staggered configuration to change the left eye image and the right eye image into different polarization directions, and then the left eye image and the right eye image are projected to the left eye and the right eye respectively, so as to generate a 3D stereoscopic image effect.
At present, in 3D cinema, 3D movies are produced in various forms, and among them, the polarized glasses method is widely adopted. It uses two parallel film cameras to represent the left and right eyes of a person respectively to shoot two film pictures with slight horizontal parallax synchronously. When showing, two films are respectively put into the left and right film projectors, and two polarizers with polarization axes at 90 degrees are respectively arranged in front of the projection lens. The two projectors need to run synchronously, and the picture is put on the metal screen to form a left image and a right image. When a viewer wears special polarized glasses, the polarization axes of the left polarizer and the right polarizer are mutually vertical and are consistent with the polarization axis in front of the projection lens, so that the left eye of the viewer can only see a left image and the right eye can only see a right image, the left image and the right image are overlapped on the retina through the binocular convergence function, and the brain nerve generates a 3D (three-dimensional) visual effect. A coherent three-dimensional picture is displayed, so that the audience feels that the scene comes out or enters a deep concave part of a screen, and a strong 'personally on the scene' feeling can be generated. At present, a polarization stereo technology is used in many large exhibition places and concert sites. However, if the projector is adopted, there are two big problems, the first point is that a special projection screen is needed, and the cost of the projection screen is basically not low, which will increase the cost by a lot; on the other hand, when the system is used, the light needs to pass through the polarized lens twice (once in front of the projector and once through the glasses), so that the brightness is attenuated to a certain extent, and therefore, a model with a higher lumen number is used in the scheme of the projector.
The advantages of the stereotactic system are that his glasses are relatively low cost, not easily damaged, and have a considerable effectiveness, so that it is suitable for use in a large number of locations for viewers. However, the angle of the polarized lens is a relatively large problem faced by the linearly polarized stereoscopic system. Since the linearly polarized stereoscopic system basically shields the left and right eye images against the difference of the direction and angle of the polarized lenses, crosstalk (crosstalk) is generated if the lens angle of the glasses is different from the system configuration when the user's head is tilted to one side. In addition, the projection screen is specially selected to construct a polarized stereoscopic system through a projector. Because the general projection screen may destroy the polarization of light during reflection, the glasses cannot filter out the filtered light, so that the 3D effect is very poor. Therefore, a projection screen made of a special material (generally, a silver material) is required to be used, so that the light projected onto the projection screen can still maintain the original polarization, but the cost is greatly increased.
To solve the problem that the linear polarization can generate a poor 3D effect due to the angle of the glasses, the circular polarized lens can be used to replace the linear polarized lens. The basic design of circularly polarized light is to add a quarter-wave retardation film (quarter-wave plate) to one side of a linear polarizer to generate circularly polarized light. The circular polarized lens also has a left-handed polarized lens and a right-handed polarized lens, and can generate left-handed circularly polarized light and right-handed circularly polarized light. Circular polarization has relatively no problem of linear polarization lens angle due to the relation of optical properties, and the situation of ghost image caused by one side of the head is avoided.
Disclosure of Invention
The invention aims to provide a 3D display device, and aims to solve the technical problems that in the existing projection type 3D projection technology, crosstalk is generated due to the change of the angle of glasses, so that the 3D effect is poor, the brightness of a projection screen is low, the cost is high and the like.
It is another object of the present invention to provide a patterned circular polarizing plate for a 3D display device.
Another object of the present invention is to provide a method for manufacturing a patterned circular polarizing plate for a 3D display device.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a 3D display device comprising: the display device comprises a display device and a patterned circular polarizing plate arranged on the display device, wherein the patterned circular polarizing plate comprises a linear polarizing plate and a patterned liquid crystal type quarter-phase retardation film which are sequentially stacked;
wherein the linear polarizer is disposed at a side close to the display device;
the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, and the optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and the absorption axis of the linear polarizing plate form an included angle of plus 45 degrees +/-1 degrees or a minus 45 degrees +/-1 degrees respectively.
Preferably, the sizes of the first liquid crystal arrangement region and the second liquid crystal arrangement region are consistent with the size of a pixel of the display device; and/or the presence of a gas in the gas,
the thickness of the patterned liquid crystal type quarter-phase retardation film is 500 nm-5 μm.
Preferably, the linear polarizing plate is selected from: an iodine-based polarizing plate; or,
a dye-based polarizing plate; or,
a polarizing plate produced using at least one of disc-shaped, rod-shaped, and block-shaped dichroic dyes; or,
a polarizing plate produced using at least one of a discotic liquid crystal, a rod-like liquid crystal, a bulk liquid crystal, and a cholesteric liquid crystal-doped dichroic dye; or,
a polarizing plate produced by immersing at least one of iodine-based dyeing solutions in a discotic liquid crystal, a rod-like liquid crystal, a bulk liquid crystal and a cholesteric liquid crystal; or,
a polarizing plate produced using at least one of an azo derivative, a quinoline derivative, a cinnamate derivative, a phenylstyrone derivative, a maleimide derivative, a bisbenzylidene derivative, and a coumarine derivative.
Preferably, the patterned liquid crystal-type quarter-phase retardation film is selected from: at least one of a patterned liquid crystal type A plate quarter-phase retardation film, a patterned liquid crystal type O plate quarter-phase retardation film, and a patterned liquid crystal type biaxial quarter-phase retardation film.
Preferably, a linear polarizing plate of the patterned circular polarizing plate is attached to the display device by an adhesive; and/or the presence of a gas in the gas,
the patterned circular polarizing plate further includes an optical base film disposed on the other side surface of the patterned liquid crystal type quarter-phase retardation film away from the linear polarizing plate.
Preferably, the display apparatus includes: at least one of a light emitting diode, a field emission display, a plasma display, and a liquid crystal display.
Accordingly, a patterned circular polarizing plate for a 3D display device, the patterned circular polarizing plate comprising a linear polarizing plate and a patterned liquid crystal-type quarter-phase retardation film sequentially stacked;
the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, and the optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and the absorption axis of the linear polarizing plate form an included angle of plus 45 degrees +/-1 degrees or a minus 45 degrees +/-1 degrees respectively; the linear polarizer is arranged on one side close to the display device.
A method for preparing a patterned circular polarizing plate for a 3D display device includes the following steps:
obtaining an optical base film and a liquid crystal material, performing alignment treatment on the optical base film, depositing the liquid crystal material on the surface of the optical base film subjected to alignment treatment, and forming a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged on the surface of the optical base film after curing to obtain a patterned liquid crystal type quarter-phase retardation film;
and obtaining a linear polarizing plate, and arranging the linear polarizing plate on the surface of the other side, far away from the optical base film, of the patterned liquid crystal type quarter-phase retardation film to obtain a patterned circular polarizing plate.
Preferably, the liquid crystal material is selected from: at least one of rod-shaped liquid crystal, discotic liquid crystal, bulk liquid crystal and rod-shaped liquid crystal doped with chiral molecules; wherein, in the chiral molecule doped rod-shaped liquid crystal, the doping amount of the chiral molecules accounts for 0.005-2% of the total weight of the chiral molecule doped rod-shaped liquid crystal; and/or the presence of a gas in the gas,
the alignment treatment comprises the following steps: at least one of a rubbing alignment method, a micro-groove imprinting method, and a photo-alignment method.
Preferably, the optical axes of the first liquid crystal arrangement region and the second liquid crystal arrangement region and the absorption axis of the linear polarizer respectively form an included angle of plus 45 degrees +/-1 degree or an included angle of minus 45 degrees +/-1 degree; and/or the presence of a gas in the gas,
the sizes of the first liquid crystal arrangement area and the second liquid crystal arrangement area are consistent with the size of a pixel of a display device in the 3D display device.
The 3D display device provided by the invention comprises: the liquid crystal display panel comprises a display device and a patterned circular polarizing plate arranged on the display device, wherein the patterned circular polarizing plate comprises a linear polarizing plate and a patterned liquid crystal type quarter-phase retardation film which are sequentially stacked, wherein the linear polarizing plate is arranged on one side close to the display device and is used for generating a linear polarization effect on a light source emitted by the display device; the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and an absorption axis of the linear polarizing plate respectively form a positive 45 +/-1 degree included angle or a negative 45 +/-1 degree included angle, linear polarization light can be respectively converted into left-right circularly polarized light which is sequentially alternated through the first liquid crystal arrangement area and the second liquid crystal arrangement area, so that the patterned liquid crystal quarter-phase retardation film has the characteristic of separating images of left and right eyes of display equipment, a picture seen by a left eye is exactly converted into the left circularly polarized light, a picture seen by a right eye is exactly converted into the right circularly polarized light, and circular polarized light 3D glasses worn by human eyes are matched (the left-eye circularly polarized light and the right-eye circularly polarized light), the image that can let display device see for the left eye only gets into the left eye and does not let the right eye see, and in a similar way, the image that sees for the right eye only gets into the right eye and does not let the left eye see to produce the three-dimensional visual effect of 3D. The 3D display device provided by the invention can generate a better 3D stereoscopic image effect only by matching the patterned circular polarizing plate on the display equipment, a projector and a projection screen are not needed, the brightness of a display picture is superior to that of a traditional projection mode, the problems of poor 3D effect of crosstalk and the like caused by angle change of glasses in linear polarization are solved, and the 3D display device has a good 3D effect and good performance stability.
The invention provides a patterned circular polarizing plate for a 3D display device, which comprises a linear polarizing plate and a patterned liquid crystal quarter-phase retardation film which are sequentially stacked, wherein linear polarizing light can be respectively converted into left-right rotation circular polarizing light which is sequentially alternated through a first liquid crystal arrangement area and a second liquid crystal arrangement area which respectively form a positive 45 +/-1-degree included angle or a negative 45 +/-1-degree included angle with an absorption axis of the linear polarizing plate, so that the patterned liquid crystal quarter-phase retardation film has the characteristic of separating left-eye and right-eye images of a display device, and a picture seen by the display device for a left eye can only enter the left eye but not the right eye by matching circular polarizing 3D glasses worn by human eyes.
The invention provides a preparation method of a patterned circular polarizing plate for a 3D display device, which comprises the steps of firstly carrying out alignment treatment on an optical base film in different alignment directions, then depositing a liquid crystal material on the surface of the optical base film after the alignment treatment, so that the optical axis arrangement of liquid crystal molecules can have two angles, and forming a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged on the surface of the optical base film after curing, so that the generation of two circular polarized lights of left rotation and right rotation can be realized; and the linear polarizing plate is arranged on the surface of the other side, far away from the optical base film, of the patterned liquid crystal type quarter-phase retardation film, so that the patterned circular polarizing plate is obtained. The preparation method is simple and is suitable for large-scale industrial production and application.
Drawings
Fig. 1 is a schematic structural diagram of a patterned liquid crystal-type quarter-phase retardation film provided in embodiment 1 of the present invention.
Fig. 2 is a diagram of an apparatus for measuring frame crosstalk (cross talk) of a 3D display according to an embodiment of the present invention.
Fig. 3 is a result of a cross talk test of a squared grid of a patterned circular polarized 3D display device provided in embodiment 1 of the present invention.
Fig. 4 is a result of a squared cross talk test of a 3D display screen of the projection mode provided in comparative example 1 of the present invention.
Detailed Description
In order to make the purpose, technical solution and technical effect of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention is clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive step in connection with the embodiments of the present invention shall fall within the scope of protection of the present 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.
The weight of the related components mentioned in the description of the embodiments of the present invention may not only refer to the specific content of each component, but also represent the proportional relationship of the weight among the components, and therefore, the content of the related components is scaled up or down within the scope disclosed in the description of the embodiments of the present invention as long as it is in accordance with the description of the embodiments of the present invention. Specifically, the weight described in the description of the embodiment of the present invention may be a unit of mass known in the chemical industry field, such as μ g, mg, g, and kg.
An embodiment of the present invention provides a 3D display device, including: a display device and a patterned circular polarizing plate disposed on the display device; the patterned circular polarizing plate comprises a linear polarizing plate and a patterned liquid crystal type quarter-phase retardation film which are sequentially stacked, wherein the linear polarizing plate is arranged on one side close to the display equipment; the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, and the optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and the absorption axis of the linear polarizing plate respectively form included angles of plus 45 degrees +/-1 degrees or minus 45 degrees +/-1 degrees.
The 3D display device provided by the embodiment of the invention comprises: the liquid crystal display panel comprises a display device and a patterned circular polarizing plate arranged on the display device, wherein the patterned circular polarizing plate comprises a linear polarizing plate and a patterned liquid crystal type quarter-phase retardation film which are sequentially stacked, wherein the linear polarizing plate is arranged on one side close to the display device and is used for generating a linear polarization effect on a light source emitted by the display device; the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and an absorption axis of the linear polarizing plate respectively form a positive 45 +/-1 degree included angle or a negative 45 +/-1 degree included angle, linear polarization light can be respectively converted into left-right circularly polarized light which is sequentially alternated through the first liquid crystal arrangement area and the second liquid crystal arrangement area, so that the patterned liquid crystal quarter-phase retardation film has the characteristic of separating images of left and right eyes of display equipment, a picture seen by a left eye is exactly converted into the left circularly polarized light, a picture seen by a right eye is exactly converted into the right circularly polarized light, and circular polarized light 3D glasses worn by human eyes are matched (the left-eye circularly polarized light and the right-eye circularly polarized light), the image that can let display device see for the left eye only gets into the left eye and does not let the right eye see, and in a similar way, the image that sees for the right eye only gets into the right eye and does not let the left eye see to produce the three-dimensional visual effect of 3D. The 3D display device provided by the embodiment of the invention can generate a better 3D stereoscopic image effect only by matching the patterned circular polarizing plate on the display equipment, a projector and a projection screen are not needed, the brightness of a display picture is superior to that of a traditional projection mode, the problems of poor 3D effect of crosstalk and the like caused by the angle change of the glasses in linear polarization are solved, the 3D effect is good, and the performance stability is good.
In some embodiments, as shown in fig. 1, the patterned circular polarizing plate includes a linear polarizing plate 30, a patterned liquid crystal-type quarter-phase retardation film 100, and an optical base film 40, which are sequentially stacked; the patterned liquid crystal quarter-phase retardation film 100 forms first liquid crystal alignment regions 10 and second liquid crystal alignment regions 20 alternately arranged in a direction parallel to the linear polarizing plate, the absorption axes of the first liquid crystal alignment regions 10 and the linear polarizing plate respectively form positive 45 ° ± 1 °, and the optical axes of the second liquid crystal alignment regions 20 and the absorption axes of the linear polarizing plate respectively form negative 45 ° ± 1 ° included angles. The more the included angle between the optical axis of the liquid crystal alignment region and the absorption axis of the linear polarizing plate deviates from plus 45 ° or minus 45 °, the worse the conversion effect of the circularly polarized light is, resulting in the lower the purity of the obtained left-right circularly polarized light. When the optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and the absorption axis of the linear polarizing plate respectively form a positive 45-degree included angle or a negative 45-degree included angle, the purity of the left-right rotation circular polarized light is highest, and the effect is best. The optical base film 40 serves to protect and support the patterned liquid crystal-type quarter-phase retardation film 100.
In a further embodiment, the first liquid crystal arrangement region and the second liquid crystal arrangement region have a size consistent with a pixel size of the display device. In the embodiment of the present invention, the sizes of the first liquid crystal arrangement region and the second liquid crystal arrangement region are the same as the size of the pixel of the display device, each minimum light-emitting unit on the panel of the display device forms a pixel, and taking a light-emitting device composed of three primary colors of red, blue and green as an example, the minimum light-emitting unit composed of red, blue and green is the pixel, so that the sizes of the pixel of the display device are just matched with the sizes of the first liquid crystal arrangement region and the second liquid crystal arrangement region, linear polarization light emitted by the display device is respectively converted into sequentially alternating left-right circular polarization light through the first liquid crystal arrangement region and the second liquid crystal arrangement region, a picture seen by a left eye is just completely converted into left-circular polarization light, and similarly, a picture seen by a right eye is just completely converted into right-circular polarization light. The left eye that the cooperation people's eye was worn is the circular polarisation of levogyration, and the right eye is the 3D glasses of the circular polarisation of dextrorotation, alright let the picture that the display looked for the left eye only get into the left eye and do not let the right eye see, and the picture that looks for the right eye only gets into the right eye and does not let the left eye see on the same way, has just accomplished the function that 3D shows.
In further embodiments, the linear polarizer is selected from: an iodine-based polarizing plate; alternatively, the dye-based polarizing plate; or a polarizing plate produced using at least one of disk-like, rod-like, and block-like dichroic dyes; or a polarizing plate prepared by using at least one of discotic liquid crystal, rod-like liquid crystal, bulk liquid crystal, and cholesteric liquid crystal-doped dichroic dyes; or a polarizing plate prepared by immersing at least one of iodine-based dyeing solutions in a discotic liquid crystal, a rod-like liquid crystal, a bulk liquid crystal and a cholesteric liquid crystal; alternatively, the polarizing plate is manufactured using at least one of azo derivatives, quinoline derivatives, cinnamate derivatives, phenylstyrolone derivatives, maleimide derivatives, diphenylmethylene derivatives, and coumarin derivatives. The linear polarizing plate in the embodiment of the invention can be any one of the above lists, has a good polarizing effect, and can generate linear polarization on light emitted by the display device. Wherein, the iodine polarizing plate and the dye polarizing plate are the most common stretching type polarizing plates in the market at present, the iodine polarizing degree is higher, and the dye system weather resistance is better; a polarizing plate comprising a dichroic dye, an azo derivative (azo), a quinoline derivative (quinoline) derivative, a cinnamate derivative, a phenylstyrolone derivative, a maleimide derivative, a bisbenzylidene derivative, a coumarine derivative, or a combination thereof, having a dichroic dye function, is thin; the liquid crystal-doped dichroic dye polarizing plate has better weather resistance; the polarizing plate with iodine soaked has high polarization degree.
In a further embodiment, the patterned liquid crystal-type quarter-phase retardation film is selected from: at least one of a patterned liquid crystal type A plate quarter-phase retardation film, a patterned liquid crystal type O plate quarter-phase retardation film, and a patterned liquid crystal type biaxial quarter-phase retardation film. In a further embodiment, the patterned liquid crystal type quarter-phase retardation film has a thickness of 500nm to 5 μm. The patterned liquid crystal O-plate quarter-phase retardation film and the patterned liquid crystal biaxial quarter-phase retardation film have better large-viewing angle effects.
In a further embodiment, a linear polarizer of the patterned circular polarizer is attached to the display device by an adhesive. According to the embodiment of the invention, one side of the linear polarizing plate is tightly attached to the display equipment through the adhesive, so that light emitted by the display equipment firstly passes through the linear polarizing plate to generate linearly polarized light, then passes through the patterned liquid crystal type quarter-phase retardation film to respectively convert the linearly polarized light into left-right circularly polarized light which is sequentially staggered, and is matched with circularly polarized 3D glasses worn by human eyes, so that the 3D display effect is achieved.
In some embodiments, the adhesive includes, but is not limited to, a UV adhesive, an Optically Clear Adhesive (OCA), a Liquid Optically Clear Adhesive (LOCA), or a Pressure Sensitive Adhesive (PSA), and the thickness thereof may be selected according to the thickness of the linear polarizer and the patterned liquid crystal quarter-phase retardation film and the material of the adhesive. In some embodiments, it may be between 1 μm and 30 μm.
In a further embodiment, the patterned circular polarizing plate further includes an optical base film disposed on the other side surface of the patterned liquid crystal quarter-phase retardation film away from the linear polarizing plate, and the optical base film can provide better support and protection for the patterned circular polarizing plate.
In a further embodiment, the display device comprises: at least one of a light emitting diode, a field emission display, a plasma display, and a liquid crystal display. The display device of the embodiment of the invention can be a self-luminous or non-self-luminous display such as a light emitting diode, a field emission display, a plasma display, a liquid crystal display, and the like, wherein the light emitting diode includes an inorganic Light Emitting Diode (LED), an Organic Light Emitting Diode (OLED), and a quantum dot light emitting diode (QLED). Because the LED display screen is naturally luminous, a projector and a projection screen are not needed, and the brightness of a display picture is superior to that of a traditional projection mode, a 3D (three-dimensional) image effect can be generated only by matching the LED display screen with the randomly patterned circular polarizing plate in the embodiment of the invention, and the scheme can conveniently solve the problems of low cost and low brightness of the projection screen in the traditional projector scheme.
Accordingly, a patterned circular polarizing plate for a 3D display device, the patterned circular polarizing plate comprising a linear polarizing plate and a patterned liquid crystal-type quarter-phase retardation film sequentially stacked;
the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, and the optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and the absorption axis of the linear polarizing plate form an included angle of plus 45 degrees +/-1 degrees or a minus 45 degrees +/-1 degrees respectively; the linear polarizer is arranged on one side close to the display device.
The patterned circular polarizing plate for the 3D display device comprises a linear polarizing plate and a patterned liquid crystal quarter-phase retardation film which are sequentially stacked, wherein linear polarizing plates and the patterned liquid crystal quarter-phase retardation film are sequentially stacked, linear polarization light can be respectively converted into left-right circularly polarized light which is sequentially alternated through a first liquid crystal arrangement area and a second liquid crystal arrangement area which respectively form an included angle of plus 45 degrees +/-1 degrees or minus 45 degrees +/-1 degrees with an absorption axis of the linear polarizing plate, so that the patterned liquid crystal quarter-phase retardation film has the characteristic of separating left and right eye images of a display device, and a picture seen by the left eye of the display device can only enter the left eye but not the right eye of the display device by matching with circularly polarized 3D glasses worn by human eyes.
Correspondingly, the embodiment of the invention also provides a preparation method of the patterned circular polarizing plate for the 3D display device, which comprises the following steps:
s10, obtaining an optical base film and a liquid crystal material, performing alignment treatment on the optical base film, depositing the liquid crystal material on the surface of the optical base film subjected to alignment treatment, and forming a first liquid crystal arrangement region and a second liquid crystal arrangement region which are alternately arranged on the surface of the optical base film after curing to obtain a patterned liquid crystal type quarter-phase retardation film;
s20, obtaining a linear polarizing plate, and arranging the linear polarizing plate on the surface of the other side, away from the optical base film, of the patterned liquid crystal type quarter-phase retardation film to obtain a patterned circular polarizing plate.
According to the preparation method of the patterned circular polarizing plate for the 3D display device, the optical base film is subjected to alignment treatment in different alignment directions, then the liquid crystal material is deposited on the surface of the optical base film subjected to alignment treatment, so that the optical axis arrangement of liquid crystal molecules can form two angles, and the first liquid crystal arrangement region and the second liquid crystal arrangement region which are alternately arranged are formed on the surface of the optical base film after curing, so that the generation of two kinds of left-handed circular polarized light and right-handed circular polarized light can be realized; and the linear polarizing plate is arranged on the surface of the other side, far away from the optical base film, of the patterned liquid crystal type quarter-phase retardation film, so that the patterned circular polarizing plate is obtained. The preparation method is simple and is suitable for large-scale industrial production and application.
In a further embodiment, the alignment treatment comprises: at least one of a rubbing alignment method, a micro-groove imprinting method, and a photo-alignment method. The alignment treatments such as a rubbing alignment method, a micro-groove imprinting method, a photo-alignment method and the like adopted by the embodiment of the invention can flexibly adjust the optical axis direction of liquid crystal molecules. The photo-alignment treatment can be matched with a photomask and a roll-to-roll process is adopted to obtain the patterned liquid crystal quarter-phase retardation film with the characteristics of the first liquid crystal arrangement area and the second liquid crystal arrangement area which are arranged in a staggered mode, so that the patterned liquid crystal quarter-phase retardation film has better productivity. It is to be noted that, when the material of the patterned liquid crystal quarter-phase retardation film is selected from a rod-shaped liquid crystal doped with chiral molecules, a rubbing alignment method can be used in combination with a regionalized shielding to align the optical axis directions of the liquid crystal molecules in the first liquid crystal alignment region and the second liquid crystal alignment region, and a desired optical axis angle is achieved through self-assembly adjustment, so as to obtain the patterned liquid crystal quarter-phase retardation film having the characteristics of the first liquid crystal alignment region and the second liquid crystal alignment region which are arranged in a staggered manner.
In some embodiments, the liquid crystal material is selected from: at least one of rod-shaped liquid crystal, discotic liquid crystal, bulk liquid crystal and rod-shaped liquid crystal doped with chiral molecules; wherein, in the chiral molecule doped rod-shaped liquid crystal, the doping amount of the chiral molecules accounts for 0.005-2% of the total weight of the chiral molecule doped rod-shaped liquid crystal.
In some embodiments, the optical base film may be made of at least one of triacetylcellulose, polymethyl methacrylate, cyclic olefin polymer, acryl, polyethylene terephthalate-1, 4-cyclohexanedimethanol ester. The optical base films adopted by the embodiment of the invention have good alignment treatment adaptability and can play good supporting and protecting roles on the patterned liquid crystal type quarter-phase retardation film.
In some embodiments, the optical axes of the first and second liquid crystal alignment regions and the absorption axis of the linear polarizer form an included angle of plus 45 ° ± 1 ° or an included angle of minus 45 ° ± 1 ° respectively. The sizes of the first liquid crystal arrangement area and the second liquid crystal arrangement area are consistent with the size of a pixel of a display device in the 3D display device.
In order to make the above implementation details and operations of the present invention clearly understood by those skilled in the art and to make the advanced performance of the 3D display device according to the embodiment of the present invention obviously manifest, the above technical solution is exemplified by a plurality of embodiments.
Example 1
A patterned circularly polarized 3D display device, comprising: an LED display and a patterned circular polarizing plate disposed on the display apparatus, as shown in fig. 1, the patterned circular polarizing plate including a linear polarizing plate 30, a patterned liquid crystal-type quarter-phase retardation film 100, and an optical base film 40 sequentially stacked; the patterned liquid crystal quarter-phase retardation film 100 is composed of first liquid crystal alignment regions 10 and second liquid crystal alignment regions 20 which are alternately arranged, the absorption axes of the first liquid crystal alignment regions 10 and the linear polarizing plate respectively form positive 45 degrees +/-1 degrees, and the optical axes of the second liquid crystal alignment regions 20 and the absorption axes of the linear polarizing plate respectively form negative 45 degrees +/-1 degrees; the linear polarizer 40 is disposed on a side close to the LED display. Wherein, the patterned liquid crystal quarter-phase retardation film 100 is made of a rod-shaped liquid crystal LC242 manufactured by BASF corporation; the linear polarizing plate 40 was an iodine-based polarizing plate manufactured by LIT photoelectric Co., Ltd., model No. UHLC25610 SU.
The left and right eye images of the LED display are separated through the patterned liquid crystal type quarter-phase retardation film 100, namely, the patterned liquid crystal type quarter-phase retardation film 100 has the characteristic of respectively converting the left and right eye images of the LED display screen into left-handed circularly polarized light and right-handed circularly polarized light, and 3D glasses of the left-handed circularly polarized light and the right-handed circularly polarized light are matched, so that a 3D stereoscopic visual effect can be generated.
Comparative example 1
A 3D display screen in a conventional projection mode, comprising: the left and right projectors are used to project images and are respectively equipped with left-hand and right-hand circular polarizers in front of the projection lens. The two projectors are synchronously operated, and the picture is put on the cloth screen to form a left image and a right image. And 3D glasses matched with left-handed circularly polarized light and right-handed circularly polarized light generate a 3D stereoscopic visual effect.
Further, in order to verify the advancement of the patterned circular polarization type 3D display device in embodiment 1 of the present invention, a frame crosstalk performance test was performed in the embodiment of the present invention.
Test example 1
As shown in fig. 2, an apparatus for measuring crosstalk (crosstalk talk) of a 3D display includes a 3D display device and a detection camera (detection camera) with a circular polarizer disposed in front of a lens, which can detect the left and right eye image brightness transmitted to the detection camera in different areas of the 3D display device, respectively, and further calculate the corresponding crosstalk value thereof, the 3D display separates the left and right eye images to match with the two eyes of a viewer, respectively, when the matching is broken, the left and right eye images are mistakenly transmitted to generate crosstalk, and therefore, the mathematical expression of the 3D display crosstalk η is:
η＝Iwrong/Iright×100％ (1)
in the formula (1) IwrongRefers to the brightness, I, of light erroneously entering the viewing zonerightIs the brightness of the light that would otherwise enter the viewing zone. Both of the above two luminances need to subtract the background luminance.
In the experiment, we placed the protective camera at the recommended viewing distance of the 3D display device. And according to the arrangement rule of the Sudoku visual area of the 3D display device, measuring in a manner of translating the detective camera. During measurement, the image played by the visual area to be measured is a full white image with the color levels (255,255 and 255), the image played by the other visual areas is a full black image with the color levels (0,0 and 0). For a 3D display device, when a left image is completely white and a right image is completely black, the brightness distribution in a left visual area is measured to be Iright(ii) a When the left and right images are reversed, the brightness distribution in the left visual area is measured as Iwrong. The crosstalk ratio distribution can be obtained by using the formula (1). As the most important evaluation index of the 3D display technology, a crosstalk rate of 5% is sufficient to cause visual discomfort to more than half of viewers, and a crosstalk rate of more than 10% makes it difficult for stereoscopic images to be merged in the brains of viewers.
As shown in fig. 3, the patterned circular polarization 3D display device provided in embodiment 1 of the present invention has a good 3D stereoscopic visual effect, the cross talk (crosstalk) values of the squared differences are all within 3%, and the average value (average) is 1.57%.
As shown in fig. 4, the 3D display screen of the projection mode provided in comparative example 1 of the present invention has a cross talk (crosstalk) value as high as 10.14%, and is unevenly distributed, with an average value of 3.46%.
Comparing the 3D stereoscopic effect of the patterned circularly polarized 3D display device provided in example 1 with the 3D display screen of the conventional projection mode provided in comparative example 1 (fig. 3 and 4), it is found that the patterned circularly polarized 3D display device provided in example 1 has a lower squared 3D display crosstalk than the 3D display screen of the conventional projection mode, and the overall 3D stereoscopic visual effect is better than that of the display screen of the conventional projection mode (cross talk of 1.57% on average versus 3.46% on average).
Therefore, the projection scheme of the patterned circular polarization type 3D display device can conveniently solve the problems of low projection screen cost and low brightness of the traditional projector scheme, has a better integral 3D stereoscopic vision effect, and has novelty and advancement compared with the projection scheme of the traditional 3D projector.
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 (10)
1. A3D display device, comprising: the display device comprises a display device and a patterned circular polarizing plate arranged on the display device, wherein the patterned circular polarizing plate comprises a linear polarizing plate and a patterned liquid crystal type quarter-phase retardation film which are sequentially stacked;
wherein the linear polarizer is disposed at a side close to the display device;
the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, and the optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and the absorption axis of the linear polarizing plate form an included angle of plus 45 degrees +/-1 degrees or a minus 45 degrees +/-1 degrees respectively.
2. The 3D display apparatus according to claim 1, wherein the first liquid crystal alignment region and the second liquid crystal alignment region have a size identical to a pixel size of the display device; and/or the presence of a gas in the gas,
the thickness of the patterned liquid crystal type quarter-phase retardation film is 500 nm-5 μm.
3. The 3D display device of claim 2, wherein the linear polarizer is selected from the group consisting of: an iodine-based polarizing plate; or,
a dye-based polarizing plate; or,
a polarizing plate produced using at least one of disc-shaped, rod-shaped, and block-shaped dichroic dyes; or,
a polarizing plate produced using at least one of a discotic liquid crystal, a rod-like liquid crystal, a bulk liquid crystal, and a cholesteric liquid crystal-doped dichroic dye; or,
a polarizing plate produced by immersing at least one of iodine-based dyeing solutions in a discotic liquid crystal, a rod-like liquid crystal, a bulk liquid crystal and a cholesteric liquid crystal; or,
a polarizing plate produced using at least one of an azo derivative, a quinoline derivative, a cinnamate derivative, a phenylstyrone derivative, a maleimide derivative, a bisbenzylidene derivative, and a coumarine derivative.
4. The 3D display device according to any one of claims 1 to 3, wherein the patterned liquid crystal-type quarter-phase retardation film is selected from the group consisting of: at least one of a patterned liquid crystal type A plate quarter-phase retardation film, a patterned liquid crystal type O plate quarter-phase retardation film, and a patterned liquid crystal type biaxial quarter-phase retardation film.
5. The 3D display device according to claim 4, wherein a linear polarizer of the patterned circular polarizer is attached to the display apparatus by an adhesive; and/or the presence of a gas in the gas,
the patterned circular polarizing plate further includes an optical base film disposed on the other side surface of the patterned liquid crystal type quarter-phase retardation film away from the linear polarizing plate.
6. The 3D display apparatus of claim 5, wherein the display device comprises: at least one of a light emitting diode, a field emission display, a plasma display, and a liquid crystal display.
7. A patterned circular polarizing plate for a 3D display device, comprising a linear polarizing plate and a patterned liquid crystal-type quarter-phase retardation film sequentially stacked;
the patterned liquid crystal quarter-phase retardation film forms a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged in a direction parallel to the linear polarizing plate, and the optical axes of the first liquid crystal arrangement area and the second liquid crystal arrangement area and the absorption axis of the linear polarizing plate form an included angle of plus 45 degrees +/-1 degrees or a minus 45 degrees +/-1 degrees respectively; the linear polarizer is arranged on one side close to the display device.
8. A method for preparing a patterned circular polarizing plate for a 3D display device, comprising the steps of:
obtaining an optical base film and a liquid crystal material, performing alignment treatment on the optical base film, depositing the liquid crystal material on the surface of the optical base film subjected to alignment treatment, and forming a first liquid crystal arrangement area and a second liquid crystal arrangement area which are alternately arranged on the surface of the optical base film after curing to obtain a patterned liquid crystal type quarter-phase retardation film;
and obtaining a linear polarizing plate, and arranging the linear polarizing plate on the surface of the other side, far away from the optical base film, of the patterned liquid crystal type quarter-phase retardation film to obtain a patterned circular polarizing plate.
9. The method of manufacturing the patterned circularly polarizing plate for a 3D display device according to claim 8, wherein the liquid crystal material is selected from the group consisting of: at least one of rod-shaped liquid crystal, discotic liquid crystal, bulk liquid crystal and rod-shaped liquid crystal doped with chiral molecules; wherein, in the chiral molecule doped rod-shaped liquid crystal, the doping amount of the chiral molecules accounts for 0.005-2% of the total weight of the chiral molecule doped rod-shaped liquid crystal; and/or the presence of a gas in the gas,
the alignment treatment comprises the following steps: at least one of a rubbing alignment method, a micro-groove imprinting method, and a photo-alignment method.
10. The method of claim 8, wherein optical axes of the first and second liquid crystal alignment regions and an absorption axis of the linear polarizer form an included angle of plus 45 ° ± 1 ° or an included angle of minus 45 ° ± 1 ° respectively; and/or the presence of a gas in the gas,
the sizes of the first liquid crystal arrangement area and the second liquid crystal arrangement area are consistent with the size of a pixel of a display device in the 3D display device.
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