WO2011068342A2

WO2011068342A2 - Stereoscopic image display device

Info

Publication number: WO2011068342A2
Application number: PCT/KR2010/008497
Authority: WO
Inventors: 김태민; 김성철
Original assignee: 주식회사 에프엠디
Priority date: 2009-12-04
Filing date: 2010-11-29
Publication date: 2011-06-09
Also published as: KR100967899B1; WO2011068342A3

Abstract

The present invention relates to a three-dimensional image display device, and more particularly to a stereoscopic three-dimensional image display device of a polarization division method using a patterned retarder composed of a photo-crosslinkable liquid crystal film. The present invention is characterized in that various organic polymer films instead of the existing glass are used as bases used for manufacturing a patterned retarder. The organic polymer films are very inexpensive, thin, and light and producibility in a manufacturing process of the image display device is high in comparison with the glass having an inorganic property and can enhance the long-term reliability of the patterned retarder by adding an ultraviolet-proof function thereto. A contrast ratio and a luminance and the like are improved by utilizing various optical characteristics like natural refractive indexes or double refraction of the films. Thereby, a three-dimensional stereoscopic image display device having improved three-dimensional sensitivity can be formed.

Description

Stereoscopic video display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional (3D) stereoscopic image display device, and more particularly, to a stereoscopic three-dimensional stereoscopic image display device of a polarization division method using a pattern retarder composed of photocrosslinkable liquid crystals.

Stereoscopic display has been progressively developed since its creation around the 20th century, and it has been developed as a stereoscopic stereoscopic display device (shutter glasses, micro polarizer, patterned retarder type, etc.), autostereoscopic stereoscopic image display device (parallax barrier, lenticular lens type, Etc.) and holograms have emerged to date.

Of these, the glasses type has a wider viewing angle and less dizziness when viewed, and can be produced at a relatively low cost, especially at a very low cost compared to holograms. The market is expanding because there are advantages such as being able to use 2D and 3D with one display.

Representative methods of glasses type 3D include shutter glasses method, which is a time-crossing method, and polarization split method, which is a time-division method. The shutter glasses method displays left and right images of the left and right eyes of the shutter glasses alternately on one screen. The sequential opening / closing timing is matched with the time-interval time of the displayed image so that each image is recognized separately from the left eye and the right eye. By dividing two images into two different polarization directions, and by using polarized glasses with left and right polarizers having different polarization directions, the left and right eyes recognize two different images. This is how you feel.

The shutter glasses method needs to increase the number of times per unit time in order to reduce fatigue and increase stereoscopic feeling.When this method is applied to the current LCD, the slow response speed of the liquid crystal and the screen addressing timing of the scan method are applied. It is known that flicker occurs because addressing timing does not completely match the timing of time crossing, which causes fatigue such as dizziness when listening.

The polarization splitting method does not cause flickering as described above, and causes less fatigue during viewing, but the resolution is reduced in half because two rows, columns, or pixels must be divided in order to display two images simultaneously on one screen. There is. However, since most of the current display devices such as LCDs are very high resolution, and it is possible to sufficiently improve the resolution in the future, there are many opinions that half resolution is not a problem in the polarization split 3D product configuration.

In addition, the shutter glasses method must be equipped with hardware or circuitry in the display to display the time difference, and expensive glasses called shutter glasses are required, and the cost is very high when multiple people are watching, whereas the polarization split method is used on the front of the display device. A patterned polarization splitting optical medium (patterned retarder, micro polarizer, etc.) capable of dividing the polarization is relatively expensive because many people can wear the polarizing glasses which are very inexpensive and can view them. It costs very little.

The current LCD is a display device using polarization, and is very suitable for applying polarization splitting 3D, and a representative method is a patterned retarder method. A patterned retarder forms (patterns) an optical medium with phase differences in two different directions in units of pixels, rows, or columns of an LCD and fits the LCD pixels or pixel units in front of the LCD ( When aligned, the output polarization is modulated to have different polarization directions. The outgoing polarization of the LCD is linearly polarized, so if the phase retardation of the patterned retarder optical medium is 1/4 wavelength, the polarization of the outgoing polarization of the LCD is +45 degrees and -45 degrees, respectively. When the right-sided polarized light is obtained and the polarized eyeglasses equipped with the left-circle polarizer and the right-side polarizer are viewed and viewed, both eyes see different images divided to feel a three-dimensional effect and feel a three-dimensional effect such as depth and protrusion. )

In the case of using linearly polarized light (Fig. 3), the optical medium of 1/2 wavelength is arranged so that the first region is 45 degrees in the emission polarization direction and the second region is 0 with the emission polarization direction (or optically isotropic). Polarization glasses with two linear polarizers arranged on a 90-degree optical axis allow the left and right images to be split. The linear polarization method reduces the extinction ratio rapidly if the optical axis of the linear polarization is not fixed. There is a disadvantage that the three-dimensional feeling is not completely separated. On the other hand, the use of circular polarization is preferred because there is almost no reduction in extinction ratio unless the circular polarization arrangement of the source polarization and the polarizing glasses is rotated by 90 degrees. As described above, a method of separating polarized light into linearly or circularly polarized light using a polarizing plate and a phase delay plate may be a variety of methods using conventional physical methods. For example, the same circular polarization effect can be obtained by stacking a 1/8 wavelength first phase delay plate at a polarization axis with 22.5 degrees and a 1/8 wavelength second phase delay plate at 45 degrees (Fig. 7). By laminating a phase delay plate of 1/4 wavelength, a linearly polarized light effect can be obtained (Fig. 6). In addition, a circular polarization effect can be obtained by stacking a half-wave and a quarter-wave phase retardation plate, where half-wavelength is patterned and quarter-wavelength is unpatterned photocrosslinked liquid crystal film or stretched film. (Fig. 4, 5) As for the 1/4 wavelength substrate, many products made by stretching films made of organic polymer materials such as PC, COP, PAc, PMMA, TAC, etc. are commercialized and can be used. . Examples of various methods of constructing a patterned phase delay plate (pattern retarder) having a polarization separation function as described above are well illustrated in FIGS. 2 to 7, and the method of manufacturing such a phase delay plate is also in the present invention. Of course, it can be used.

As a method of manufacturing a patterned retarder, a pattern alignment method of coating a photocrosslinkable liquid crystal on a substrate and aligning the patterns to have different optical axes and then photocrosslinking to form a liquid crystal polymer film is common. to be. In order to align the photocrosslinkable liquid crystal (reactive mesogene), the substrate is generally coated with a polyimide and subjected to a high temperature firing, followed by a pattern rubbing orientation method and a rubbing pattern. Pattern photo-alignment method by applying a photo mask and polarizing irradiation (or non-polarization inclination) and aligning the substrate, or by applying a mask to the surface formed by coating the substrate itself or an alignment layer and ion beam Or a pattern alignment forming method such as obliquely irradiating a plasma beam in a vacuum.

The substrate used in the above process is mainly glass of tempered glass (soda lime, inorganic material of borosilicates) that is used as the upper and lower plates when manufacturing LCD cells. do. Although the material is very expensive compared to ordinary glass, it is used because of its strong mechanical properties at the same thickness, excellent surface flatness, high transparency, uniform optical characteristics without birefringence, and an alignment film or a photocrosslinked liquid crystal on it. It is easy to coat with uniform thickness using general spin costing method and is easy to procure because it is widely distributed as LCD manufacturing glass.

However, glass materials have many problems besides the disadvantage that they are expensive.

First of all, the possibility of breakage during the manufacturing process is very high. In particular, there is a possibility of breakage due to high-speed rotation of the spin coating to obtain a uniform film in the coating. In order to attach the patterned retarder formed on the glass to the LCD, an adhesive must be filled in between and the glass is pressurized. Not only is there a high possibility of breakage, but also the process time (tact time) is very long, yields and yields are poor.

In addition, spin coating is almost the only method to form a uniform liquid crystal coating film on the glass material. In this method, the ratio of the coating liquid to be dispersed during rotation is very high compared to the coating liquid, which is a special material, which is very expensive. However, the quantitative loss of the photocrosslinkable liquid crystal solution is very large.

In addition, this tempered glass generally does not completely block ultraviolet rays (UV), and when exposed to ultraviolet rays during long-term use, the photocrosslinkable liquid crystal polymer film is deteriorated and its phase difference value is changed, and at the same time, the polarization separation effect is lowered and 3D stereoscopic effect is lowered. There is a problem of long-term reliability.

In addition, the glass has a disadvantage in that the reflection of the light is severe and the 3D three-dimensional effect is not only lowered due to the glare caused by the reflection of the external light, but also the fatigue caused by the glare when viewing the 2D image.

In addition, because glass has its own thickness, the light emitted from the LCD may cause fine internal diffuse reflection within the thickness and propagate to the surroundings. Therefore, the left and right images are not completely distinguished, and the image to be incident on one eye is also incident on the other eye. There is a problem that crosstalk occurs, which ultimately degrades 3D stereoscopic feeling.

In addition, spin coating method of high speed rotation should be used for uniform coating on glass. In case of 50 inches or more, spin coating equipment is 50 inches because there is virtually no equipment available except for low speed rotation (equipment for cleaning glass surface). It is almost impossible to produce a patterned retarder of more than a class, which makes it difficult to meet the trend of larger displays.

The technical problem to be solved by the present invention is to propose a stereoscopic image display device and a new method for manufacturing the same to replace the conventional glass used as the substrate of the patterned retarder (organic polymer film).

The present invention provides a new patterned retarder which can realize a cheaper and improved quality 3D stereoscopic display device while presenting new advantages that cannot be obtained in existing patterned retarder products and the same. It is possible to provide a used 3D LCD.

In order to achieve the technical problem to be achieved by the present invention, a polarization separator comprising a photocrosslinkable liquid crystal polymer film; And an organic film part composed of an organic polymer material having refractive index anisotropy of 0 ≦ Rth ≦ 30nm, or 0 ≦ Re ≦ 30nm, wherein the polarization passing through the organic film part includes both left circularly polarized light and right circularly polarized light. A stereoscopic image display device is provided.

The organic polymer material is triacetyl cellulose (TAC), cyclo olefin copolymer (COP), polyacrylate (Pac), poly ether sulfone (PES), polycarbonate (PC), polyetheretherketon (PEEK), polymethylmethaacrylate (PMMA), polyetherimide (PEI), PEN (polyethylenemaphthatlate), PET (polyethyleneterephtalate), PI (polyimide), PSF (polysulfone) and PVA (polyvinylalcohol), PAR (polyarylate), it is preferably any one selected from an amorphous fluorine resin.

When the organic film part has an optical characteristic of (-) c, the (-c) optical property is 0 ≦ Rth ≦ 10 nm, and when the organic film part has a (−) a optical property, the (- a) The optical property is 0 ≤ Re ≤ 10 nm, and when the organic film part has a optical property, the optical property is more preferably 0 ≤ Re ≤ 10 nm.

It is preferable that at least one coating of at least one of an anti reflection coating, an anti glare, and a hard coating is further added to one surface of the organic film portion.

The organic film portion is preferably composed of an organic polymer film having a phase difference of 1/4 wavelength.

And an alignment layer between the polarization separator and the organic film layer, wherein the alignment layer is formed on the organic film portion, or the alignment layer is formed separately from the alignment layer forming substrate on the alignment layer forming substrate, and the alignment layer is formed. After the substrate is separated from the alignment film, the organic film portion is preferably adhered to the alignment film, or the alignment film is any one or more of being formed by ultraviolet irradiation treatment on the surface of the organic film portion.

The alignment layer forming substrate is triacetyl cellulose (TAC), cyclo olefin copolymer (COP), polyacrylate (Pac), poly ether sulfone (PES), polycarbonate (PC), polyetheretherketon (PEEK), polymethylmethaacrylate (PMMA), polyetherimide (PEI), PEN (polyethylenemaphthatlate), PET (polyethyleneterephtalate), PI (polyimide), PSF (polysulfone) and PVA (polyvinylalcohol), PAR (polyarylate), it is preferably any one selected from an amorphous fluorine resin.

The front polarizer further comprises; The front polarizer is preferably bonded directly to the liquid crystal polymer film.

In order to achieve the technical problem to be achieved by the present invention, at least one polarization splitter including a photocrosslinkable liquid crystal polymer film; And an organic film part composed of a polymer organic material having a refractive index of 1.33 to 1.53, more preferably 1.33 to 1.50, wherein the refractive index of the organic film part is smaller than that of the liquid crystal polymer film part. The polarized light passing through the organic film part includes a left circularly polarized light and a right circularly polarized light.

The polymer organic material is triacetyl cellulose (TAC), cyclo olefin copolymer (COP), polyacrylate (Pac), poly ether sulfone (PES), polycarbonate (PC), polyetheretherketon (PEEK), polymethylmethaacrylate (PMMA), polyetherimide (PEI), PEN (polyethylenemaphthatlate), PET (polyethyleneterephtalate), PI (polyimide), PSF (polysulfone) and PVA (polyvinylalcohol), PAR (polyarylate), it is preferably any one selected from an amorphous fluorine resin.

When the organic film part has an optical characteristic of (-) c, the (-c) optical property is 0 ≦ Rth ≦ 10 nm, and when the organic film part has a (−) a optical property, the (- a) The optical property is 0 ≤ Re ≤ 10 nm, and when the organic film part has a optical property, the optical property is preferably 0 ≤ Re ≤ 10 nm.

In order to achieve the technical problem to be achieved by the present invention, at least one polarization splitter including a photocrosslinkable liquid crystal polymer film; And an organic film part composed of an organic polymer material including a UV blocking material, wherein the polarized light passing through the organic film part includes both left circularly polarized light and right circularly polarized light. A stereoscopic image display device is featured.

It is preferable that the said organic film part has refractive index anisotropy of 0 <= Rth <= 10nm, or 0 <Re <= 10nm.

In order to achieve the technical problem to be achieved by the present invention, forming an alignment film by coating the alignment material on the organic film portion made of a polymer organic material; Surface-aligning the alignment layer; And forming a photocrosslinkable liquid crystal polymer film by adding and curing a photocrosslinkable liquid crystal layer to the surface-oriented alignment layer, wherein the organic polymer material has an index of refraction of 0 ≤ Rth ≤ 30 nm, or 0 ≤ Re ≤ 30 nm. A method of manufacturing a stereoscopic image display device is provided.

The polymer material may have a refractive index of 1.33 to 1.53, more preferably 1.33 to 1.50.

Preferably, the polymer material further comprises a sunscreen material.

In order to achieve the technical problem to be achieved by the present invention, forming an alignment film by coating the alignment material on the alignment film forming substrate; Surface-aligning the alignment layer; Adding and curing a photocrosslinkable liquid crystal layer to the surface oriented alignment film to form a photocrosslinkable liquid crystal polymer film; And removing the alignment layer forming substrate, and forming the organic film part made of an organic polymer material on one surface of the liquid crystal polymer film part in a manner of attaching and bonding the organic film part, wherein the polymer organic material is 0 ≦. A method of manufacturing a stereoscopic image display device having refractive index anisotropy of Rth ≦ 30 nm or 0 ≦ Re ≦ 30 nm is provided.

In the case of using an organic polymer film instead of glass in the manufacture of a stereoscopic image display device has the following advantages.

First, the cost of the material is low, there is almost no possibility of damage, and the processability is very excellent and the process cost is low in manufacturing the pattern retarder and manufacturing the stereoscopic image display device having the same.

Second, since the UV-blocking agent may be mixed with the organic polymer film, the UV-blocking function is provided to the organic polymer film, thereby improving long-term reliability of the photocrosslinkable liquid crystal film vulnerable to ultraviolet rays.

Third, compared to glass, there is less glare due to reflection of external light, so there is less deterioration of stereoscopic feeling when viewing stereoscopic images, and less fatigue of eyes.

Fourth, since the organic polymer film has a thin film of 0.1 mm or less in actual use, the transmittance is higher than glass having a thickness of 0.5 to 0.7 mm, and there is almost no diffuse reflection in the film, thereby reducing the crosstalk phenomenon.

Fifth, the organic polymer film has a film whose refractive index is lower than the refractive index of glass (1.5 ~ 1.54), and when the film is used, the refractive index of the photocrosslinkable liquid crystal film is further increased to improve the antireflection effect and improve the C / R. Can be.

1 is a diagram illustrating an embodiment in which a stereoscopic image display device of the present invention is coupled to an LCD.

2 is a diagram illustrating an example of a stereoscopic image display apparatus using a quarter wavelength (liquid crystal film).

3 is a diagram illustrating an example of a stereoscopic image display apparatus using ½ wavelength (liquid crystal film).

4 is a diagram illustrating an example of a stereoscopic image display apparatus using ½ wavelength (liquid crystal film) and ¼ wavelength (stretched film).

FIG. 5 is a diagram illustrating an example of a stereoscopic image display apparatus using ½ wavelength (liquid crystal film) and ¼ wavelength (liquid crystal film or stretched film).

FIG. 6 is a diagram illustrating an example of a stereoscopic image display apparatus using a multilayer liquid crystal film (1/4 wavelength).

FIG. 7 is a diagram illustrating an example of a stereoscopic image display apparatus using a multilayer liquid crystal film (1/8 wavelength).

FIG. 8 is a view illustrating another example of a stereoscopic image display device in which a pattern retarder is laminated without a TAC protective film on the outer surface of the polarizer when the polarizer is laminated with the pattern retarder. FIG.

9 is a flowchart illustrating a method of manufacturing a stereoscopic image according to the present invention.

10 is a flowchart illustrating another embodiment of the method for manufacturing a stereoscopic image according to the present invention.

*** Description of the main parts of the drawings ***

100: organic polymer film 200: alignment film

300: polarization separation unit 310: photocrosslinkable liquid crystal polymer film

310a: photocrosslinkable liquid crystal polymer film or stretched film

311: first region 312: second region

321: polarization axis and -22.5 degrees 322: polarization axis and +22.5 degrees

323: polarization axis and -45 degrees 324: polarization axis and +45 degrees

400: front polarizer 510: front glass

520: color filter side 530: liquid crystal

540: TFT side

550: Virtual alignment line that fits the interface between the center of the BM and the pattern

560 black matrix (BM) 570 rear glass

580: rear polarizer 590: backlight unit

600: polarizing plate protective film 650: PVA (polarizing layer)

700: Adhesive

Hereinafter, it demonstrates in detail, referring drawings.

1 is a diagram illustrating a structure of a stereoscopic image display device according to an exemplary embodiment of the present invention. 1 is a diagram illustrating an embodiment using an LCD as a stereoscopic image display device of the present invention. In the present embodiment, it is shown that the polarization separator 300 is composed of two photocrosslinkable liquid crystal polymer film portions 310. Meanwhile, the film between the alignment layer 200 and the photocrosslinkable liquid crystal polymer film 310 may be a photocrosslinkable liquid crystal polymer film or a stretched film 310a. It can be seen that the organic polymer film 100 of the present invention is disposed outside the polarization separator 300 and the alignment layer 200.

The size of the pattern formed in the patterned retarder corresponds to the pixel or pixel unit width and is very precise. Usually, the pattern is formed in accordance with the rows or columns of the LCD, and the rows of the LCD pixels when mounted on the LCD, or It is easy in the manufacturing process to form a patterned retarder on the glass, which is a hard substrate, because it must be attached in exact alignment with the position of the rows. However, in the case of a flexible polymer organic film that satisfies specific optical properties, it is possible to maintain the smoothness of the film in the manufacturing process, so that a sophisticated patterned retarder may be used as a flexible substrate called the organic polymer film 100. It is possible to form on.

In general, there are various types of flexible substrates, but in patterned retarders for making 3D displays, excellent optical properties (high light transmittance, uniform refractive index distribution, etc.), mechanical properties without deformation above a certain level, and ease of manufacturing process The base material which satisfy | fills (ease of coating) etc. is required.

In the present invention, as a method to improve the overall product quality and significantly reduce the manufacturing cost while improving the shortcomings of the existing glass material, triacetyl cellulose (TAC) as a new substrate that can be properly configured optically and mechanically and also has easy processability. , Cyclo olefin copolymer (COP), polyacrylate (Pac), poly ether sulfone (PES), polycarbonate (PC), polyetheretherketon (PEEK), polymethylmethaacrylate (PMMA), polyetherimide (PEI), polyethylenemaphthatlate (PEN), polyethyleneterephtalate (PET), PI (polyimide), PSF (polysulfone), PVA (polyvinylalcohol), PAR (polyarylate), amorphous fluorine resin and the like were introduced.

The material of the organic polymer film 100 of the present invention preferably has a vertical birefringence property of 0 ≦ Rth ≦ 30 nm, or a planar birefringence property of 0 ≦ Re ≦ 30nm, and more preferably 0 ≦ Rth It is preferable that ≤ 10 nm, or 0 ≤ Re ≤ 10 nm. If Rth> 30nm, there is a problem of lowering the contrast in the lateral direction. If Re> 30nm, the circular polarization emitted in combination with the birefringence characteristic of the photocrosslinkable liquid crystal film is changed, which may lower the stereoscopic image quality. There is.

The refractive index of the organic polymer film 100 of the present invention is preferably 1.33 to 1.53, more preferably 1.33 to 1.50. If the refractive index exceeds 1.53, the refractive index of the photocrosslinkable liquid crystal film is about 1.53 ~ 1.8, so the difference between the refractive index of the photocrosslinkable liquid crystal film is not large and the antireflection effect obtained by the combination of high refractive index and low refractive index, and the C / R improvement effect will not be large. Can be.

The film 100 of the organic polymer material is a primary advantage that the price is very cheap compared to the conventional glass material.

In addition, since these films are usually thin films of 0.1 mm or less, there is almost no crosstalk due to diffuse reflection in the thickness, so that the 3D stereoscopic effect is not reduced, and the absolute light transmittance (about 88 to 95% depending on the type) of the glass is absolute. There is no significant difference from the light transmittance (93%), and since it is used with a much thinner thickness than glass, the relative transmittance is very high, which has the advantage of minimizing luminance reduction.

It is preferable that the organic polymer film 100 used in the stereoscopic image display device of the present invention contains a predetermined amount of a sunscreen inhibitor. Unlike glass, the organic polymer film 100 is patterned on such a film substrate because it is possible to manufacture a film to block ultraviolet rays by adding a predetermined amount of ultraviolet (blocking) agent to the material during its manufacture. Forming a retarder and attaching it to the LCD can block incoming ultraviolet rays, thereby preventing long-term deterioration of the photocrosslinkable liquid crystal polymer film 310, thereby improving long-term reliability as a 3D display. Sunscreen inhibitors include salicylic acid esters, benzophenones, oxybenzophenones, benzotriazols, cyanoacrylates, and benzoates ( Substances based on organic substances such as benzoate) may be used, and the base material containing the benzoate may be disposed on the forefront and bonded to prevent deterioration of the photocrosslinkable liquid crystal polymer by UV transmission. Such sunscreens are generally contained in a weight ratio of 0.1 to 25% by weight relative to the film main material in the film manufacturing to have a sunscreen effect. Mineral sun-based zinc oxide, nickel complex salt, etc. may be used as the sunscreen, but it should be noted that the permeability of the film containing the same may be reduced.

On the other hand, as a process for coating the alignment layer 200 and the photocrosslinked liquid crystal on the flexible organic polymer film 100 using a variety of methods such as slot die (roll), roll (roll), gravure (gravure), etc. Adopt a public law. The flexible rainy season polymer film can be a continuous coating rather than a batch type coating such as spin coating used for a glass substrate, and thus an alignment film which is excellent in mass production and an expensive material. As a result, it is possible to greatly reduce the optical cross-linking liquid crystals, which leads to a significant cost reduction.

The flexible organic polymer films 100 made of the polymer material introduced in the present invention may have various refractive indices, of which the intrinsic refractive index of the photocrosslinkable liquid crystal forms a patterned retarder (generally, It is preferable to use lower types as compared to about 1.525 to 1.8, on average 1.66). When a photocrosslinkable liquid crystal polymer is formed on a polymer organic film having a relatively large difference in refractive index compared to a photocrosslinked liquid crystal forming a patterned retarder, a high refractive index and a low refractive index combination of a patterned retarder and a polymer organic film is used. The effect of antireflection can also be obtained. This is not noticeable when using a conventional soda lime or borosilicate glass (refractive index 1.5 ~ 1.54) substrate. In addition, since the reflectance of the film itself to the external light is also very low compared to glass, the combined effect can result in a much improved image quality.

On the other hand, in a 3D display device using a circularly polarized light by attaching a 1/4 wavelength patterned retarder to the front side, the externally reflected light is reduced by the circularly polarized light, thereby improving the contrast. There is an advantage. By properly combining the refractive index of the organic polymer film 100 (for example, by using the organic polymer film 100 having a refractive index lower than the average refractive index of the photocrosslinked liquid crystal film 310), the above linear effects can be maximized. As a result, the effect of improving not only 3D stereoscopic feeling but also 2D image quality itself (contrast enhancement effect) is very obvious.

In addition, compared to thick and heavy glass, the light weight thin polymer organic film hardly increases in thickness and weight when attached to the front of the LCD, so it meets the trend of light weight thinning of the display, and is particularly advantageous when applied to a mobile LCD.

On the other hand, a film made of such a polymer material has a problem that it may have refractive index anisotropy due to the occasional fine stretching occurs in the manufacturing process or due to the characteristics of the material itself. Accordingly, a-plate (nx> ny = nz), (-) a-plate (nx = nz> ny), c-plate (nx = ny <nz), and (-) c-plate (nx = ny> nz The birefringence characteristic such as) may be minutely retained. Such optical characteristics may finely alter the properties of the polarized pattern divided into 1/4 or 1/2 wavelengths, and in some cases, the 3D stereoscopic feeling may be reduced while the relative extinction ratio of polarized light incident on both eyes is lowered. Therefore, it is common to see that the film should not have birefringence properties. The minus sign is negative which is commonly applied herein.

However, in the present invention, when the TAC having fine (-) c characteristics (0 ≦ Rth ≦ 30 nm) is used as the organic polymer film 100 of the present invention, the polarization degree of circularly polarized light or linearly polarized light emitted is hardly changed. We have found that there can be advantages, especially when constructing 3D using two separate circularly polarized light.

In order to make a photocrosslinkable liquid crystal polymer having a 1/4 wavelength, a very thin photocrosslinkable liquid crystal coating should be applied. However, in the process of preparing the coating solution by diluting the photocrosslinkable liquid crystal in a solvent, a slight variation in the coating thickness is often caused by a slight error in the mixing ratio. As a result, when left and right polarized light is generated due to phase delay of 1/4 wavelength and -1/4 wavelength, a slight deviation is caused in each polarization degree, which may have a small effect on the separation of two images incident on the left and right eyes. . In the present invention, it was observed that the minute deviation of the emitted circularly polarized light was slightly diluted while passing through the TAC film having the (-) c characteristic. This is an advantage that the TAC film layer on the outermost surface compensates for the slight deviation in the coating solution manufacturing, and as a result, the margin of the coating solution manufacturing process in the patterned retarder film manufacturing process without degrading the 3D stereoscopic effect. The advantage is that you can take a margin relatively broadly.

Optical media of negative (-) c properties are generally obtained by cholesteric orientation of liquid crystals (or photocrosslinkable liquid crystals). In this case, it is known that the light passing through the medium is partially diffracted into the left circularly polarized light or the right circularly polarized light, depending on whether the direction of rotation of the oriented cholesteric liquid crystal is left linearity or priority. This effect can occur remarkably when the thickness of the liquid crystal oriented in the cholesteric phase is sufficient so that at least Rth is several tens of nm or more.

The negative (-) c properties of TAC films are due to the intrinsic properties of the material, tri-acetyle cellulose, which is usually at the level of 0 ≦ Rth ≦ 30 nm and no left-handedness or priority. Therefore, the compensation effect of the TAC film observed in the present invention affects the direction of rotation while the source polarized light in different rotation directions passing through the patterned retarder passes through the TAC film having a fine (-) c characteristic. It is assumed that each circular polarization is slightly increased or decreased without receiving. Experimentally, when the negative (-) c characteristic was too large, the contrast in the inclined direction out of the front direction tended to decrease. Therefore, even for this reason, it is appropriate that the (-) c property of the film used as the substrate does not exceed 30 nm.

In the flexible organic polymer film 100 of the present invention, a stretched film made of PC, COP, etc. having a three-dimensional refractive characteristic of fine a or (-) a characteristics may be used. These optical properties can be combined with the a-plate properties (1/4 or 1/2 wavelength) of the liquid crystal polymer film to modify the degree of polarization (or circular polarization) and affect the 3D stereoscopic effect. In the present invention, the minimized one should be used. However, when Re is less than 30 nm, it does not appear to be substantially a problem. In addition, when the optical axis of the stretched film coincides with the optical axis of one of the two regions of the optical crosslinkable liquid crystal film, the birefringence characteristics of the two optical media are combined. However, when the coating film of the optical crosslinkable liquid crystal film is somewhat thin, the phase difference value is insufficient. This can be compensated for in part, so it may be an advantage to properly arrange each optical axis when constructing the product.

Hereinafter, a method of manufacturing the stereoscopic image display device of the present invention will be described with reference to FIGS. 9 to 10.

First, a base material is prepared. As a substrate, an organic polymer film 100 made of triacetyl cellulose (TAC) was used. In addition to TAC (triacetyl cellulose), COP (cyclo olefin copolymer), Pac (Polyacrylate), PES (poly ether sulfone), PC (polycarbonate), PEEK (polyetheretherketon), PMMA (polymethylmethaacrylate), PEI (polyetherimide), PEN ( Flexible organic polymer films are possible with materials such as polyethylenemaphthatlate (PET), polyethylene terephtalate (PET), polyimide (PI), polysulfone (PSF), polyvinylalcohol (PVA), polyarylate (PAR), and amorphous fluorine resin. In the process of using a film coated with a hard coating, an anti reflection anti-glare coating, etc., on the opposite side of the surface on which the patterned retarder is to be coated on the films of various materials. It may be desirable.

Next, the alignment film 200 is formed (S110). Dissolve a certain amount (typically less than 15 wt%) of vinyl polymerized photosensitive polymer (Aldrich) with Cinnamate side chains in a solvent and filter (0.2 micrometer absolute pore) to prepare an alignment material solution to be coated. PGMEA was used as a solvent. As the solvent, various aromatic hydrocarbons, ketones, acetates, and general solvents of alcohols or mixed solvents thereof may be used. The alignment solution is coated on the substrate by a gravure coating method, and the solvent is dried (less than 90 degrees) to obtain an alignment film 200 (about 1,000 kPa). At this time, it is coated on the opposite side of the substrate surface to which the alignment film 200 is treated, such as antireflection coating. Otherwise, it is carried out on any surface which is easy. In addition, you may use the conventional orientation film coding method other than the gravure coating method.

Then, the surface alignment step (S120). A photomask divided by rows of LCD pixels is applied to the surface of the alignment layer 200 to irradiate ultraviolet (230 nm to 350 nm) polarized light (linearly or elliptically) in the vertical direction (or non-polarized ultraviolet light (230 nm to 350 nm). ) In the oblique direction to surface-orientate the first region. The photomask is moved by the row spacing of the pixels to surface align the remaining portions in the same manner to form the second region. At this time, the polarization direction (or oblique irradiation direction) of the ultraviolet light determines the orientation direction of the liquid crystal coated in the next step. Therefore, in order for the completed patterned retarder to emit circularly polarized light in opposite directions, the polarizations of ultraviolet rays should be 90 degrees apart from each other when irradiating 1 and 2 regions.

Subsequently, the photocrosslinkable liquid crystal polymer film deposition step (S130). Before this step, the preparation of the photocrosslinkable liquid crystal should be completed. Solid photocrosslinked liquid crystals (Reactive mesogen (RM), Merck's horizontal alignment RM, BASF's LC242) together with a photoinitiator (Ciba Irganox), alcohols such as acetates such as PGMEA and IPA A suitable amount was dissolved in (alcohols, solvents such as these, and a mixed solvent thereof) and a filter (0.2 micrometer absolute pore) was prepared to prepare a photocrosslinked liquid crystal solution to be coated. The prepared liquid crystal solution is coated on the pattern oriented surface by a gravure coating method and the solvent is dried (less than 70 degrees). As the solvent is dried, the liquid crystals are horizontally arranged in the alignment direction of the alignment layer 200 to form optical axes of 90 degrees to each other. An inert atmosphere (nitrogen) is formed on the liquid crystal coated surface to block oxygen, and irradiated and cured by irradiating with unpolarized ultraviolet rays (270 to 450 nm) to form a photocrosslinkable liquid crystal polymer film 310. The completed photocrosslinkable liquid crystal polymer film 310 becomes a patterned retarder film in which liquid crystal is pattern-oriented.

After the above process, the patterned retarder film may be bonded to the display device. When the completed film 310 is bonded to the display device, the pattern-oriented liquid crystal film 310 must be bonded to face the front polarizer 400 of the display device, and between the film 310 and the front polarizer 400. An adhesive 700 (epoxy, acrylic, etc.) layer is formed on the film 310 so as to be fixed to the front polarizing plate 400 after bonding. In this case, in order to prevent bubbles from forming between the film and the front polarizer 400 and to prevent foreign substances such as dust from entering, it is more advantageous to bond in a vacuum state. In addition, the pattern formed on the patterned retarder and the pixel rows (or columns) of the display device must be bonded together so that the alignment mark 550 (align mark) is pre-set with the display device and the pattern retarder. It may be formed on a patterned retarder and aligned based on the patterned retarder, and an appropriate image may be placed on a display device in advance, and the method may be performed while visually checking. When the bonding of the patterned retarder is completed, the first 3D stereoscopic image display device is completed.

The above embodiment is an example and under this basic process concept, each of the partial processes can be made by various methods.

For example, in the case of a coating process, almost all film coating processes such as slot dies, rolls, and the like, in addition to gravure, may be selectively applied to the entire process flow. In addition, in preparing a solution of an alignment material or a photocrosslinkable liquid crystal, a solution may be prepared using various solvents having compatibility according to the type of substrate or alignment material to be coated. In addition, in the alignment process, various methods, such as the well-known rubbing method and the non-contact orientation method by inclined irradiation of ion beam or plasma, may be used in addition to the above-described optical alignment method. . In the case of the alignment material, a variety of material products that can be applied to various processes can be used, and in the case of the bonding process, there are various methods that can be predicted by general knowledge in addition to the examples above. For example, in the case of LCD, the front polarizer 400 is laminated with a patterned retarder and a method such as lamination in advance without attaching the front polarizer to the front polarizer 400 and the patterned retarder. ) And a method of attaching the film to the front surface of the LCD may be used. In this case, it is also possible to use the alignment mark 550 or to attach the appropriate image in advance.

In general, the (front) polarizing plate 400 is composed of a PVA film having a polarizing function and laminated on both sides with a TAC film as a protective film. In this case, when the front polarizing plate 400 is laminated with the pattern retarder, the pattern retarder may be laminated without the outer surface TAC protective film of the polarizer. In this case, the overall thickness and the cost may be reduced, and the pattern retarder and the display may be Since the distance to the device can be reduced, the viewing angle can be enlarged when viewing 3D. Embodiments in this regard are well illustrated in FIG. 8. In FIG. 8, the polarizer protective film 600 and the organic polymer film 100 may be made of the same material.

In addition, the photocrosslinkable liquid crystal polymer layer may be directly formed on the front polarizer 400 using the above-described alignment methods.

10 illustrates a case where the alignment film-forming substrate and the organic film composed of the polymer organic material of the present invention are different. First, an alignment layer is formed by coating an alignment material on an alignment layer forming substrate (S210), and then the surface of the alignment layer is aligned (S220), and a photocrosslinkable liquid crystal layer is added to the surface aligned alignment layer and cured to form a photocrosslinkable liquid crystal polymer film 310. The present invention can also be realized in a manner of forming (S230), and then removing the alignment layer forming substrate and forming an organic film 100 made of an organic polymer on one surface of the liquid crystal polymer (S240). .

On the other hand, without forming an alignment film, the polymer organic film of the present invention is directly irradiated with an ion beam or a plasma beam to orient the surface of the polymer organic material film 100, and the price of the organic polymer film 100 subjected to the surface alignment treatment The crosslinked liquid crystal may be coated to form a liquid crystal polymer film. A detailed description thereof will be apparent to those skilled in the art as described in detail in Korean Patent Registration No. 10-0641746-0000 invented by the inventor of the present patent.

On the other hand, a patterned retarder substrate bonded together to further reinforce the characteristics (optical and mechanical properties) of the substrate placed on the front surface of the completed 3D display device as an additional method accessible by general knowledge. The 3D display device may be completed by peeling off portions to transfer only the pattern-oriented liquid crystal polymer layer to the display device and attaching a substrate having desired optical and mechanical properties again. In this case, when the use environment of the 3D display device is very poor compared to the normal use environment and demands high strength of the surface, glass may be coated on the outermost surface to commercialize it. At this time, the use of the adhesive 700 having a very low refractive index (less than 1.5) as the adhesive 700 for attaching the glass will be advantageous in terms of anti-reflection, and may also be anti-ultraviolet (blocking) to the adhesive 700 for bonding the glass in advance. ) May be added to give a sunscreen effect.

In addition, in the present invention, it is preferable to use an adhesive which does not require a solvent as an epoxy or acrylic having a natural hardening type, a photo hardening property, or an adhesive mixed therein as an adhesive used for bonding or lamination of a film. Since the adhesive 700 also forms a thin film together with the base material and the liquid crystal film, there may be an influence of the refractive index. In the present invention, the smaller the refractive index of the adhesive 700, the lower it is (1.5 or less). In the case of using the optical adhesive of the refractive index is less than about 1.6 it can be seen that little effect on the image quality.

On the other hand, in the case of glass products without conventional mechanical flexibility when the pattern retarder is bonded, the bonding time is very long and the thickness of the adhesive layer between them is required because the adhesive must be put in the center and press the glass from the center to diffuse the adhesive. There was a problem that is not constant or bubbles remain. On the contrary, when the flexible organic polymer film 100 of the present invention was used, since the adhesive 700 was coated in advance and thus (pressurized) adhesion was possible at one time, the bonding time could be greatly reduced. In addition, when the glass base material is used, the pattern retarder may be detached during long-term use due to its own weight. Therefore, it is necessary to supplement the frame by installing an edge frame even after bonding. Since there is little, the adhesive 700 alone can provide stability without further supplementation by an edge frame or the like. In addition, the production of two or more patterned retarders by manifolding in one coating batch to improve productivity requires expensive mechanical or laser cutting equipment for glass products, while inexpensive for flexible film products. The facility not only enables the process but also yields high yields without fear of breakage.

In addition to the organic polymer materials mentioned in the present invention, as many various polymer materials, it is possible to manufacture a flexible film that meets the purpose of the present invention, and it can be seen that such a film can be used for the purposes of the present invention.

In general, flat panel displays such as organic EL, PDP, and FED, which do not use polarization, are provided with a polarizing plate (or equivalent polarizing medium) on the surface of the display element, and then a pattern retarder film is placed thereon. Since the effect can be obtained, the present invention can be applied to a general pixelated display device.

The present invention can be widely used in various electronic industries such as stereoscopic image display industry, stereoscopic image display module manufacturing industry, display industry.

Claims

A polarization separator including at least one photocrosslinkable liquid crystal polymer film; And

It includes; an organic film portion made of an organic polymer material having an optical property of 0 <Rth ≤ 30nm or 0 <Re ≤ 30nm, the refractive index is 1.33 to 1.53;

The polarized light passing through the organic film part includes both left circularly polarized light and right circularly polarized light.
The method of claim 1,

The organic polymer material is triacetyl cellulose (TAC), cyclo olefin copolymer (COP), polyacrylate (Pac), poly ether sulfone (PES), polycarbonate (PC), polyetheretherketon (PEEK), polymethylmethaacrylate (PMMA), polyetherimide (PEI), 3D image display device characterized in that it is any one selected from polyethylenemaphthatlate (PEN), polyethyleneterephtalate (PET), polyimide (PI), polysulfone (PSF) and polyvinylalcohol (PVA), polyarylate (PAR), and amorphous fluorine resin .
The method of claim 1,

When the organic film part has an optical property of (-) c, the (-c) optical property is one of 0 <Rth ≤ 10 nm,

When the organic film part has (-) a optical property, the (-a) optical property is 0 <Re ≤ 10 nm.

And wherein the optical property is 0 <Re ≤ 10 nm when the organic film part has a optical property.
The method of claim 1,

One side of the organic film portion is an anti-reflective coating, an anti-glare coating and a mechanically enhanced coating further comprises a three-dimensional image display device, characterized in that further added.
The method of claim 1,

And the organic film part is made of an organic polymer material having a phase difference of 1/4 wavelength.
The method of claim 1,

Further comprising;

And the front polarizer is directly bonded to the liquid crystal polymer.
The method of claim 1,

The organic film unit is a three-dimensional image display device comprising a sunscreen material.
Forming an alignment layer by coating an alignment material on an organic film part formed of an organic polymer material;

Surface-aligning the alignment layer; And

And adding and curing a photocrosslinkable liquid crystal layer to the surface oriented alignment film to form a photocrosslinkable liquid crystal polymer film.

The organic polymer material has an optical property of 0 <Rth ≤ 30nm or 0 <Re ≤ 30nm, and has a refractive index of 1.33 to 1.53 has a characteristic of producing a stereoscopic image display device.
The method of claim 8,

The organic polymer material further comprises a UV blocking material.
The method of claim 8,

The organic polymer material is triacetyl cellulose (TAC), cyclo olefin copolymer (COP), polyacrylate (Pac), polyether sulfone (PES), polycarbonate (PC), polyetheretherketon (PEEK), polymethylmethaacrylate (PMMA), polyetherimide (PEI), PEN (polyethylenemaphthatlate), PET (polyethyleneterephtalate), PI (polyimide), PSF (polysulfone) and PVA (polyvinylalcohol), PAR (polyarylate), manufacturing a stereoscopic image display device characterized in that it is any one selected from Way.
Forming an alignment layer by coating the alignment material on the alignment layer forming substrate;

Surface-aligning the alignment layer;

Adding and curing a photocrosslinkable liquid crystal layer to the surface oriented alignment film to form a photocrosslinkable liquid crystal polymer film; And

And removing the alignment layer forming substrate and forming an organic film part made of a polymer organic material on one surface of the liquid crystal polymer part in at least one of adhesion and bonding methods.

The organic polymer material has an optical property of 0 <Rth ≤ 30nm or 0 <Re ≤ 30nm, and has a refractive index of 1.33 to 1.53 has a characteristic of producing a stereoscopic image display device.
The method of claim 11,

The organic polymer material is triacetyl cellulose (TAC), cyclo olefin copolymer (COP), polyacrylate (Pac), polyether sulfone (PES), polycarbonate (PC), polyetheretherketon (PEEK), polymethylmethaacrylate (PMMA), polyetherimide (PEI), PEN (polyethylenemaphthatlate), PET (polyethyleneterephtalate), PI (polyimide), PSF (polysulfone) and PVA (polyvinylalcohol), PAR (polyarylate), manufacturing a stereoscopic image display device characterized in that it is any one selected from Way.