WO2013177955A1

WO2013177955A1 - Patterned phase difference film and manufacturing method thereof

Info

Publication number: WO2013177955A1
Application number: PCT/CN2013/070002
Authority: WO
Inventors: 陈家泰
Original assignee: 财团法人工业技术研究院
Priority date: 2012-06-01
Filing date: 2013-01-04
Publication date: 2013-12-05
Also published as: TW201350918A; CN103890621A

Abstract

A patterned phase difference film used for a stereoscopic display and a manufacturing method thereof. The manufacturing method comprises the following steps: providing a transparent substrate(110) having an optical phase retardation of _λ, wherein n is a natural number, coating a reactive liquid crystal material(120) having an optical phase retardation of _λ on the transparent substrate(110) partially and solidifying the reactive liquid crystal material (120).

Description

Patterned phase difference film and method of manufacturing the same

The present application relates to a patterned retardation film and a method of fabricating the same, and more particularly to a patterned retardation film for use in a stereoscopic display and a method of fabricating the same. Background technique

With the advancement of display technology, a stereoscopic display technology has been developed. Stereoscopic display technology utilizes the parallax of the left and right eyes to produce a stereoscopic image.

The stereoscopic display mainly uses the phase difference film to cause the left eye picture and the right eye picture to enter the left eye and the right eye, respectively, thereby generating parallaxes of the left eye and the right eye. In the process of making a phase difference film, it is necessary to precisely control specific regions with different optical phase delays. Therefore, the production cost of the retardation film is currently high and the process is complicated. Some retardation films are too low in production speed and do not meet the needs of mass production. Therefore, in the development of phase difference films, there are still technical bottlenecks that are difficult to break through. Summary of the invention

The present application relates to a patterned retardation film and a method of manufacturing the same.

According to a first aspect of the present application, a method of fabricating a patterned retardation film is proposed. The patterned retardation film is applied to a stereoscopic display. The method of manufacturing a patterned retardation film includes the following steps. A transparent substrate is provided. The transparent substrate has a ^^ photophase retardation. π is a natural number. In

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A reactive liquid crystal material is partially coated on the transparent substrate. Reactive liquid crystal material has 丄1 optical phase extension

2

late. Curing reactive liquid crystal material.

According to a first aspect of the present application, a patterned retardation film is proposed. The patterned phase difference film is applied to a stereoscopic display. The patterned retardation film comprises a transparent substrate and a reactive liquid crystal material. Transparent substrate has ^! ! Optical phase delay. η is! ] Rare. Reactive liquid crystal material

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Placed on a transparent substrate. The reactive liquid crystal material has a retardation of 1 1 optical phase.

2

In order to best understand the above and other aspects of the present application, the following detailed description of the embodiments and the accompanying drawings, DRAWINGS

FIG. 1 is a schematic view of a patterned retardation film.

2 is a schematic view showing the operation of the patterned retardation film of FIG. 1.

3A to 3C are flow charts showing a method of manufacturing a patterned retardation film. 4 is a schematic view showing another embodiment of a fleece roller and a transparent substrate. Figure 5 is a schematic illustration of another embodiment of a reactive liquid crystal material.

Description of the reference numerals

100: patterned retardation film

110: transparent substrate

110a: surface

111 : Surface alignment structure

111a: Fine engraving

120: reactive liquid crystal material

600: coating head

700: Flannel roller

800: 90° polarizing film

900: Polarized glasses

910: Left-eye polarized lenses

911 : 丄1 optical phase retardation film

4

912: 0° polarizing film

920: Right-eye polarized lenses

921 : Optical phase retardation film

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922: 0° polarizing film

A1 : 丄 A optical phase delay area

4

A3: 2 optical phase delay area

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L1 : Light

L2: 90° linearly polarized light

L31 : Right-handed circularly polarized light

L32: Left-handed circularly polarized light L41 : 0° linearly polarized light

L42: 90° linearly polarized light

UV: ultraviolet light

Referring to FIG. 1, a schematic diagram of the patterned retardation film 100 is illustrated. The patterned phase difference film 100 is applied to a stereoscopic display (not shown), and then matched with polarized glasses 900 (shown in FIG. 2), so that the viewer can feel the stereoscopic image. As shown in FIG. 1, the patterned retardation film 100 includes a transparent substrate 110 and a reactive liquid crystal material 120.

The surface of the transparent substrate 110 may be a surface alignment structure 111. The surface alignment structure 111 is, for example, a plurality of strip-shaped fine engraves 111 a which are substantially aligned toward the same alignment direction, for example, parallel to the X-axis direction or 45 to the X-axis direction. Degree angle.

The reactive liquid crystal material 120 is partially disposed on the surface alignment structure 111. As shown in Fig. 1, the reactive liquid crystal material 120 is not entirely disposed on the surface alignment structure 111, but is disposed only on a portion of the surface alignment structure 111. That is, part of the surface alignment structure 111 is exposed. In the present embodiment, the reactive liquid crystal material 120 is applied in a plurality of elongated structures arranged in a coating direction and spaced apart. This coating direction is, for example, parallel to the extending direction of the transparent substrate 110.

In an embodiment, the surface of the transparent substrate 110 may be free of surface alignment structures 111. As long as the reactive liquid crystal material 120 is applied to the flat surface of the transparent substrate 110 by a suitable coating technique, it is also possible to have an alignment effect without the surface alignment structure 111. In the present embodiment, the surface alignment structure 111 used for the transparent substrate 110 can enhance the alignment effect of the reactive liquid crystal material 120.

The transparent substrate 110 has a light phase retardation, and η is a natural number. That is, transparent base

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The material 110 can have an optical phase delay of 丄 1, 1, , , , and the like. Reactive liquid crystal material 120 has 丄1 light

4 4 2 Phase delay. In the present embodiment, the transparent substrate 110 has a 光1 optical phase retardation. In the absence of setting anti

4

The position of the liquid crystal material 120 has a 丄1 optical phase retardation to form a 丄1 optical phase retardation region A1.

4 4

An optical phase delay of 1 (丄 + 丄 = ) at a position where the reactive liquid crystal material 120 is disposed

4 4 2 4

Late, the optical phase delay zone A3 is formed. Optical phase retardation zone of transparent substrate 100, Al, A3

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The fast axis angle is 45 degrees. Please refer to FIG. 2 , which is a schematic diagram of the operation of the patterned retardation film 100 of FIG. 1 . The patterned retardation film 100 is disposed at a 90. Outside the polarizing film 800. Thanks to 90. The angle of penetration of the polarizing film 800 is 90. The light L1 emitted by the stereoscopic display (not shown) passes through 90. After the polarizing film 800, 90 is formed. Linearly polarized light L2. With the control of the image output, 90 will be displayed with the right eye. The linearly polarized light L2 is supplied to the 丄1 optical phase delay region A1 and will have 90 with the left eye picture.

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Linearly polarized light L2 is supplied to the optical phase delay region A3.

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In the polarized glasses 900 worn by the user, the left-eye polarizing lens 910 includes a 光1 optical phase.

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Delay film 911 and a 0. Polarized film 912, right-eye polarized lens 920 includes a 1 optical phase delay

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Film 921 and a 0. Polarized film 922. The optical axis retardation film 911, 921 has a fast axis angle of 135 degrees and 0. The angles of the transmission axes of the polarizing films 912 and 922 are zero. .

Please refer to the content shown in the left eye section of Figure 2. When 90. When the linearly polarized light L2 passes through the 丄1 optical phase retardation region A1 of the patterned phase difference film 100, right-handed circularly polarized light L31 is formed. Then,

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When the right-handed circularly polarized light L31 passes through the 1 1 optical phase retardation film 911, it becomes 90° linearly polarized light.

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L42. Then, the 90° linearly polarized light L42 enters the 0° polarizing film 912 of the left eye lens. Due to 90° linearly polarized light L42 and 0. The polarizing direction of the polarizing film 912 is perpendicular, so 90. Linearly polarized light L42 cannot pass smoothly.

Please refer to the content shown in the left eye section of Figure 2. When 90. When the linearly polarized light L2 passes through the one-phase retardation region A3 of the patterned phase difference film 100, left-handed circularly polarized light L32 is formed. Then,

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When the left circularly polarized light L32 passes through the i l optical phase retardation film 911, it becomes 0° linearly polarized light L41.

4

Due to 0. Linearly polarized light L41 and 0. The polarizing film 912 has the same polarization direction, so 0. Linearly polarized light

L41 can pass smoothly.

That is, for the left eye, what can be seen is the left-eye picture provided by the 1 optical phase delay area A3 of the patterned phase difference film 100.

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Please refer to the content shown in the right eye section of Figure 2. When 90. When the linearly polarized light L2 passes through the 丄1 optical phase retardation region A1 of the patterned phase difference film 100, right-handed circularly polarized light L31 is formed. Then,

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When the right circularly polarized light L31 passes through the optical retardation film 921, it becomes 0° linearly polarized light L41.

4

Then, the 0° linearly polarized light L41 enters the 0° polarizing film 922 of the right lens. Due to 0° linearly polarized light L41 and 0. The polarizing film 922 has the same polarization direction, so 0. The linearly polarized light L41 can pass smoothly. Please refer to the content shown in the right eye portion of FIG. 2. When 90. When the linearly polarized light L2 passes through the one optical phase retardation region A3 of the phase difference film 100, the left circularly polarized light L32 is formed. then,

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When the left-handed circularly polarized light L32 passes through the optical retardation film 921, it becomes 90° linearly polarized light.

4

L42. Thanks to 90. Linearly polarized light L42 and 0. The polarizing direction of the polarizing film 922 is perpendicular, so 90. The linearly polarized light L42 cannot pass smoothly.

That is, for the right eye, what can be seen is the right eye picture provided by the 丄1 optical phase delay area A1 of the patterned phase difference film 100.

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In summary, after the computed left-eye image and the right-eye image are output, the right-eye image can be transmitted to the right eye only by the patterned phase difference film 100 and the polarized glasses 900, and the left-eye image is transmitted only to Left eye. The left-eye image and the right-eye image have parallax, and when the user's eyes view two images with parallax, the user can feel the stereoscopic image.

The patterned retardation film 100 is an important component in stereoscopic display technology. How to accurately create a 光1 optical phase delay region at a predetermined position A1 and 1 optical phase delay region A3 is stereoscopic

4 4

A key technology for displays. Referring to FIGS. 3A to 3C, a flow chart of a method of manufacturing the patterned retardation film 100 is shown. Through the steps of Figs. 3A to 3C, the patterned retardation film 100 can be produced quickly and accurately.

As shown in Fig. 3A, a transparent substrate 110 is provided. Transparent substrate 110 has a light phase

4

Delay, η is a natural number. The material of the transparent substrate 110 is, for example, Triacetate Cellulose (TAC), polyethylene terephthalate (PET), polycarbonate (Polycarbonate, PC) or cobalt porphyrin polymer. (Cyclo Olefin Polymer, COP film. Taking triacetyl cellulose as an example, after the cellulose triacetate is stretched, its molecules will be substantially aligned in the stretching direction, and light phase retardation occurs when light passes through the transparent substrate 110. At a specific thickness, the optical phase retardation of the transparent substrate 110 can be adjusted to be in the present embodiment, the transparent substrate

4

The optical phase delay of 110 is adjusted to 丄1.

4

As shown in FIG. 3A, a surface alignment 110a of the transparent substrate 110 is subjected to friction alignment to form a surface alignment structure 111. In this step, the full friction alignment can be performed by the fleece roller 700. When the fleece roller 700 contacts the surface 110a of the transparent substrate 110, a long strip of fine engraving will be produced. Line llla.

In this embodiment, a roll to roll process is employed. The transparent substrate 110 is an elongated strip substrate which is continuously extended, and the fleece roller 700 is fixed to a machine table. The transparent substrate 110 can be moved under a fleece roller 700 by a conveyor belt. When the transparent substrate 110 contacts the fleece roller 700, the fleece roller 700 rolls on the surface of the transparent substrate 110 to scrape the long strip-shaped fine engraving 111a.

In the present embodiment, the long axis direction (for example, the Y-axis direction) of the fleece roller 700 is substantially perpendicular to the moving direction of the transparent substrate 110 (for example, the X-axis direction) so that the alignment direction of the elongated fine-grained pattern 111a is aligned. It is substantially parallel to the moving direction of the transparent substrate 110.

In an embodiment, referring to FIG. 4, a schematic diagram of another embodiment of the fleece roller 700 and the transparent substrate 210 is illustrated. The long axis direction of the fleece roller 700 and the moving direction of the transparent substrate 210 may be substantially at an angle of 45 degrees, so that the alignment direction of the elongated fine scribe 211a of the surface alignment structure 211 is substantially substantially the same as the moving direction of the transparent substrate 210. Clip 45 degrees.

In addition to the rubbing alignment of the flannel roller 700, other friction alignment methods may be used. In one embodiment, the bristles may be aligned, printed, or aligned by laser etching. The surface alignment structure 111 formed directly on the surface of the transparent substrate 110 can be applied to the present embodiment as long as it can be formed according to the material properties of the transparent substrate 110.

The embodiment directly performs the rubbing alignment on the surface of the transparent substrate 110 to form the integrally formed surface alignment structure 111, and does not need to additionally coat or attach any alignment layer, thereby not only maintaining manufacturing precision, but also improving the process speed. Reduce material costs.

In addition, the present embodiment directly performs the comprehensive alignment process instead of using the partial alignment process, and does not need to perform complex alignment operations in the alignment process, thereby not only improving the process speed, but also avoiding the occurrence of process errors.

As shown in Fig. 3B, the reactive liquid crystal material 120 is partially coated on the surface alignment structure 111. The reactive liquid crystal material 120 is, for example, a birefringence liquid crystal material. In this step, the reactive liquid crystal material 120 is applied by the coating head 600 into a plurality of elongated structures arranged in a specific coating direction and spaced apart. The optical phase retardation of the reactive liquid crystal material 120 can be adjusted to 丄1 at a specific thickness. That is, there is a position where the reactive liquid crystal material 120 is coated.

2

The optical phase of (丄 +丄 = ) is delayed, and the optical phase delay region A3 is formed. In no coating 4 2 4 4

The position of the reactive liquid crystal material 120 has a 丄1 optical phase retardation, and a 丄1 optical phase retardation region is formed.

4 4

Al. In one embodiment, the patterned retardation film 100 may be subjected to the step of no rubbing alignment, and the direct application of the reactive liquid crystal material 120 to the flat surface of the transparent substrate 110 may also have an alignment effect without Surface alignment structure 111. In the present embodiment, the alignment effect of the reactive liquid crystal material 120 can be enhanced by the surface alignment structure 111 formed by the transparent substrate 110 by the rubbing alignment.

In one embodiment, please refer to FIG. 5, which illustrates a schematic diagram of another embodiment of a reactive liquid crystal material 320. The reactive liquid crystal material 320 of this step can also be coated into a checkerboard structure, so that 丄1

4 Optical phase delay zone A1 and 1 optical phase delay zone A3 are arranged in a checkerboard pattern.

4

In this step, the reactive liquid crystal material 120 is in direct contact with the transparent substrate 110 without sandwiching any alignment layer. The reactive liquid crystal material 120 directly contacts the surface alignment structure 111 of the transparent substrate 110 to be aligned without interposing any alignment layer.

The reactive liquid crystal material 120 coated in this step is gel-like to facilitate coating at a specific position of the transparent substrate 110. Further, the colloidal reactive liquid crystal material 120 can also facilitate the alignment of the liquid crystal molecules on the surface alignment structure 111.

As shown in Fig. 3C, the reactive liquid crystal material 120 is cured. In this step, curing may be carried out by ultraviolet light UV or heating to prevent the reactive liquid crystal material 120 from flowing or deforming after curing.

Through the above steps, the patterned retardation film 100 can be successfully completed, and the manufactured patterned retardation film 110 is applied to the stereoscopic display, and then the polarized glasses 900 can be used to achieve the effect of viewing the stereoscopic image.

In summary, although the application has been disclosed above by way of example, it is not intended to limit the application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the scope of protection of this application is defined by the appended claims.

Claims

Claim

A method of producing a patterned retardation film, the patterned retardation film being applied to a stereoscopic display, the method of manufacturing the patterned retardation film comprising:

Providing a transparent substrate having a 相位 Ι phase retardation, η being a natural number;

4

Disposing a reactive liquid crystal material partially on the transparent substrate, the reactive liquid crystal material having a 光1 optical phase retardation;

2

The reactive liquid crystal material is cured.

2. The method of producing a patterned retardation film according to claim 1, wherein in the step of providing the transparent substrate, the transparent substrate is made of triacetate cellulose.

TAC).

The method of manufacturing a patterned retardation film according to claim 1, wherein in the step of providing the transparent substrate, the transparent substrate is made of polyethylene terephthalate (polyethylene terephthalate). PET )„

The method of producing a patterned retardation film according to claim 1, wherein in the step of providing the transparent substrate, the transparent substrate is made of polycarbonate (Polycarbonate, PC).

The method of producing a patterned retardation film according to claim 1, wherein in the step of providing the transparent substrate, the transparent substrate is made of a CycloOlefin Polymer (COP) film.

6. The method of producing a patterned retardation film according to claim 1, further comprising: performing friction alignment on a surface of the transparent substrate to form a surface alignment structure.

The method of producing a patterned retardation film according to claim 6, wherein in the step of rubbing alignment, the transparent substrate is subjected to frictional alignment in a comprehensive manner.

The method of producing a patterned retardation film according to claim 6, wherein in the step of rubbing alignment, the transparent substrate is subjected to rubbing alignment by a fleece roller.

9. The method of manufacturing a patterned retardation film according to claim 1, wherein in the step of applying the reactive liquid crystal material, the reactive liquid crystal material is coated in a plurality of rows in a coating direction and spaced apart. Configured strip structure.

The method of producing a patterned retardation film according to claim 1, wherein in the step of applying the reactive liquid crystal material, the reactive liquid crystal material is coated in a checkerboard structure.

11. The method of manufacturing a patterned retardation film according to claim 1, wherein the coating is performed In the step of reactive liquid crystal material, the reactive liquid crystal material has a birefringence.

The method of producing a patterned retardation film according to claim 1, wherein in the step of applying the reactive liquid crystal material, the reactive liquid crystal material directly contacts the transparent substrate.

13. A patterned retardation film, the patterned retardation film applied to a stereoscopic display, the patterned retardation film comprising:

a transparent substrate having a light phase retardation and η being a natural number;

4

The reactive liquid crystal material is partially disposed on the transparent substrate, and the reactive liquid crystal material has a 光1 optical phase retardation.

2

14. The patterned retardation film according to claim 13, wherein the transparent substrate is made of triacetate cellulose (TAC).

15. The patterned retardation film according to claim 13, wherein the transparent substrate is made of polyethylene terephthalate (PET).

16. The patterned retardation film according to claim 13, wherein the transparent substrate is made of polycarbonate (Polycarbonate, PC).

17. The patterned retardation film according to claim 13, wherein the transparent substrate is made of a CycloOlefin Polymer (COP) film.

18. The patterned retardation film of claim 13, wherein the surface of the transparent substrate is a surface alignment structure.

19. The patterned retardation film of claim 18, wherein the entire surface of the transparent substrate is the surface alignment structure.

20. The patterned retardation film of claim 13, wherein the reactive liquid crystal material is a plurality of elongated structures.

The patterned retardation film according to claim 13, wherein the reactive liquid crystal material is a checkerboard structure.

22. The patterned retardation film of claim 13, wherein the reactive liquid crystal material has a birefringence.

23. The patterned retardation film of claim 13, wherein the reactive liquid crystal material is in direct contact with the transparent substrate.

24. The patterned retardation film of claim 13 wherein the transparent substrate has a fast axis angle of 45 degrees.