JP4123745B2 - Method for producing laminated film - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scattering anisotropic film that is used by being attached to a liquid crystal panel of a liquid crystal display device, a laminated film in which the film is laminated, and a method for manufacturing the same. The present invention relates to a scattering anisotropic film, a laminated film, and a manufacturing method thereof that can be easily manufactured.
[0002]
[Prior art]
Conventionally, in a reflection type liquid crystal display device that changes a display pattern by modulating transmission / non-transmission of incident light according to an applied voltage, a viewing angle at the time of observation is ensured (that is, on the front surface of the display device). The front side of the reflective LCD panel (observation) is used for the purpose of making the display image appear wide and bright while reducing blurring of the image) and making the display image visible with uniform brightness over the entire display screen. On the other hand, a scattering anisotropic film having anisotropy in light scattering characteristics such that the scattering properties differ according to the change in the incident angle of incident light has been performed.
[0003]
As this type of scattering anisotropic film, those disclosed in, for example, “JP 2000-171619 A” and “JP 11-352470 A” have been used.
[0004]
That is, this scattering anisotropic film is usually used by being attached to the front side (observer side) of a reflective liquid crystal panel together with a polarizing plate that polarizes incident light. After being bonded together with the plate, it is bonded to the reflective liquid crystal panel.
[0005]
In this case, the axial direction of the light scattering characteristic of the scattering anisotropic film is aligned with the vertical and horizontal directions of the reflective liquid crystal panel of the reflective liquid crystal display device because the function is related to the viewing area of the observer. have.
[0006]
On the other hand, the polarizing plate generally has a directionality inclined with respect to the side of the reflective liquid crystal panel because the axis direction of the polarization characteristic is set depending on the alignment direction of the liquid crystal. .
[0007]
[Problems to be solved by the invention]
By the way, generally a polarizing plate is manufactured with an elongate film, The axial direction of the polarization characteristic is the direction along the flow direction of a film, or a direction orthogonal to the said direction.
[0008]
As described above, when the polarizing plate is attached to the reflective liquid crystal panel, the polarizing plate is attached while being inclined with respect to the side of the reflective liquid crystal panel.
[0009]
For this reason, generally, a polarizing plate is attached to a reflective liquid crystal panel after a long film is cut obliquely with respect to the film flow direction.
[0010]
However, as described above, the scattering anisotropic film and the polarizing plate are often attached in advance to the liquid crystal panel, but the axis of the polarizing plate is inclined to the upper and lower axes of the liquid crystal display device. In contrast, the axis of the scattering anisotropic film coincides with the upper and lower axes of the liquid crystal display device.
[0011]
For this reason, if the axes of both films are in the direction of the film flow, both the scattering anisotropic film and the polarizing plate are in the state of a long film. Can not be pasted together.
[0012]
Moreover, there is a method of making a long film in which the axis of the polarizing plate is inclined with respect to the flow direction of the long film by cutting the polarizing plate obliquely and connecting them.
[0013]
If a long film of such a polarizing plate is used, it can be bonded continuously to the long film of a scattering anisotropic film.
[0014]
However, the scattering anisotropic film has a joint in the long film in the manufacturing process, and the presence of this joint in the liquid crystal display device significantly deteriorates the display quality of the liquid crystal display device. It is necessary to remove what has the joint portion.
[0015]
Further, when the polarizing plates are cut obliquely and joined together, a joint is formed.
[0016]
And since the axes of the two films are different, the direction of this joint is also different and synchronization cannot be achieved.
[0017]
If the joints are removed when the two films are bonded together, the resulting loss will be about 30%, depending on the size of the liquid crystal display device, and this will cause a significant reduction in product yield.
[0018]
An object of the present invention is to provide a scattering anisotropic film having anisotropic light scattering characteristics, which is time-saving, has high work efficiency, and can be manufactured very easily, and a method for manufacturing the scattering anisotropic film Is to provide.
[0019]
Furthermore, an object of the present invention is to provide a laminated film having anisotropic light scattering characteristics and polarization characteristics, which can be manufactured easily and without much labor, and can be manufactured very easily. Is to provide.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, the invention corresponding to claim 1 is attached to a liquid crystal panel of a liquid crystal display device that changes a display pattern by modulating transmission / non-transmission of incident light according to an applied voltage. A long scattering anisotropy film having different scattering properties and anisotropy in light scattering characteristics according to a change in incident angle of incident light, and a directionality inclined with respect to the side of the liquid crystal panel In the manufacturing method of the laminated film which laminated | stacked the elongate polarizing plate film which has this, it modulates the said electromagnetic wave between the generation source which generate | occur | produces electromagnetic waves, and the elongate photosensitive material film which reacts to this electromagnetic waves. A polarizing plate with respect to the side of the liquid crystal panel in a state in which a mask is disposed, the mask and the long photosensitive material film are relatively fixed, and with respect to the flow direction of the long photosensitive material film Film axis tilt The long photosensitive material film is irradiated with the electromagnetic wave at an angle substantially equal to the above to produce a long scattering anisotropic film, which coincides with the flow direction of the long scattering anisotropic film. As described above, the long polarizing film is poured, and the long scattering anisotropic film and the long polarizing film are adhered to each other by laminating and bonded in a long state. is doing.
[0027]
Therefore, in the manufacturing method of the laminated film of the invention corresponding to claim 1 , by taking the above-described means, the laminated film having anisotropic light scattering characteristics and polarization characteristics is troublesome. Therefore, the working efficiency is high and the manufacturing can be performed very easily.
[0028]
DETAILED DESCRIPTION OF THE INVENTION
As described above, when the scattering anisotropic film is attached to the liquid crystal panel of the liquid crystal display device, the scattering anisotropic film is often used by being integrally attached to the polarizing plate. The work efficiency is better when the lamination is performed in the state of a film.
[0029]
Therefore, in the present invention, the axial direction of the light scattering characteristic of the long scattering anisotropic film is used by being attached to the liquid crystal panel together from the flow direction of the long scattering anisotropic film. In the state of a long film, the scattering anisotropy film and the polarizing film match each other in the flow direction of the film. In this state, they are bonded together.
[0030]
Hereinafter, embodiments of the present invention based on the above-described concept will be described in detail with reference to the drawings.
[0031]
(First embodiment)
FIG. 1 is a schematic diagram illustrating a configuration example of a scattering anisotropic film according to the present embodiment.
[0032]
That is, as shown in FIG. 1, the scattering anisotropic film 1 according to the present embodiment is a liquid crystal panel of a liquid crystal display device that changes a display pattern by modulating transmission / non-transmission of incident light according to an applied voltage. It is a long film having anisotropy in light scattering characteristics such that the scattering property varies depending on the change in the incident angle of incident light.
[0033]
Further, the angle formed by the flow direction 1A of the long scattering anisotropic film 1 and the axial direction 1B of the light scattering characteristic of the long scattering anisotropic film 1 is attached to the liquid crystal panel together. The angle is substantially equal to the inclination angle of the long polarizing film axis having the polarization characteristics used.
[0034]
Here, the tilt angle of the polarizing film axis is, for example, 45 degrees, −30 degrees, 30 degrees, 60 degrees, etc., and the difference between the incident side angle and the outgoing side angle is 90 degrees, 45 degrees. Although there are most examples, this is set as appropriate depending on how the liquid crystal panel of the liquid crystal display device is applied.
[0035]
Next, the manufacturing method of the scattering anisotropic film 1 by this Embodiment is demonstrated concretely.
[0036]
The scattering anisotropic film is manufactured by irradiating electromagnetic waves such as laser, visible light, ultraviolet rays, infrared rays, and X-rays through a mask, and the irradiation direction of the electromagnetic waves is the axis of the light scattering characteristics of the scattering anisotropic film. In many cases, it becomes a direction.
[0037]
For this reason, in this Embodiment, when manufacturing a scattering anisotropic film, it is made to irradiate electromagnetic waves from the direction of a twist with respect to the normal line direction of a scattering anisotropic film surface.
[0038]
FIG. 2 is a schematic diagram showing a specific configuration example for realizing the method for manufacturing the scattering anisotropic film 1 according to the present embodiment.
[0039]
Specifically, the scattering anisotropic film 1 according to the present embodiment is manufactured as follows.
[0040]
That is, as shown in FIG. 2, a light source 2 that is a generation source of electromagnetic waves such as laser, visible light, ultraviolet rays, infrared rays, and X-rays, a lens 3 that collimates the electromagnetic waves, and modulates the electromagnetic waves, that is, electromagnetic waves. A mask 4 having a portion that transmits light and a portion that does not transmit, a long photosensitive material film 5 that reacts to electromagnetic waves, and a long photosensitive material unwinding for flowing the long photosensitive material film 5 in a certain direction. A roll 61 and a long photosensitive material winding roll 62 are provided.
[0041]
Then, the lens 3 and the mask 4 are arranged between the light source 2 and the long photosensitive material film 5, and the pattern formed on the mask 4 is recorded on the long photosensitive material film 5. 4 and the long photosensitive material film 5 are fixed relative to each other, and the polarization characteristics used by being attached to the liquid crystal panel with respect to the flow direction 5A of the elongated photosensitive material film 5 are as follows. The long photosensitive material film 5 is irradiated with electromagnetic waves at an angle substantially equal to the inclination angle of the long polarizing film axis.
[0042]
Here, as an example of the photopolymerization photopolymer constituting the long photosensitive material film 5, for example, a photo disclosed in "JP-A-2-3081" or "JP-A-2-3082" is disclosed. Polymers can be used.
[0043]
Examples of the actual photopolymerizable photopolymer product include DuPont's Omnidex series (disclosed in "JP-A-5-27436").
[0044]
In addition, the long scattering anisotropic film 1 manufactured by the manufacturing method as described above is actually a protective film for preventing scratches attached to one side of the scattering anisotropic film 1. Created as the final product.
[0045]
Next, in the scattering anisotropic film 1 and the manufacturing method thereof according to the present embodiment as described above, the flow direction 5A of the long photosensitive film 5 is pasted together on the liquid crystal panel and used. The light of the long scattering anisotropic film 1 is irradiated by irradiating the long photosensitive material film 5 with electromagnetic waves at an angle substantially equal to the tilt angle of the long polarizing film axis. The axial direction 1B of the scattering characteristics was tilted from the flow direction 1A of the long scattering anisotropic film 1 according to the inclination angle of the long polarizing film axis used by being attached to the liquid crystal panel together. By preparing the film in advance, the scattering anisotropic film 1 having anisotropic light scattering characteristics can be manufactured very easily without much trouble and with high work efficiency.
[0046]
As described above, in the scattering anisotropic film 1 and the manufacturing method thereof according to the present embodiment, the scattering anisotropic film 1 having anisotropic light scattering characteristics is not troublesome and has high work efficiency. It can be easily manufactured.
[0047]
(Second Embodiment)
FIG. 3 is a cross-sectional view showing a configuration example of the laminated film according to the present embodiment.
[0048]
That is, as shown in FIG. 1, the scattering anisotropic film 7 according to the present embodiment is a long scattering anisotropic film 1 having the configuration of the first embodiment shown in FIG. A long polarizing film 8 having a polarization characteristic for polarizing incident light is laminated so that the flow directions of the respective films coincide with each other, and are laminated together.
[0049]
Next, the manufacturing method of the laminated film 7 by this Embodiment is demonstrated concretely.
[0050]
Generally, when a long film is produced, a slight optical rotation occurs in the film due to heat or stress.
[0051]
However, this leads to a decrease in the polarization characteristics of the polarizing plate when bonded to the polarizing plate.
[0052]
In the case of a long film, this optical rotatory axis is generated along the flow direction of the film because of the tension. This optical rotatory effect is small when it is parallel or orthogonal to the polarization characteristic axis of the polarizing plate. However, if it occurs in an obliquely twisted direction, the color changes depending on the region, or due to the compensation plate. Correction becomes difficult.
[0053]
For this reason, in the present embodiment, when a long scattering anisotropic film and a long polarizing film are bonded together, they are bonded together in a state in which the flow directions of the respective films match. Try to match.
[0054]
FIG. 4 is a schematic diagram showing a specific configuration example for realizing the manufacturing method of the laminated film 7 according to the present embodiment.
[0055]
The laminated film 7 according to the present embodiment is manufactured by the following process.
[0056]
A long scattering anisotropic film 1 manufactured by the manufacturing method of the first embodiment shown in FIG. 2 and a long polarizing film 8 having a polarization characteristic for polarizing incident light. The films 1 and 8 are laminated so that the flow directions of the films 1 and 8 coincide with each other.
[0057]
Specifically, as shown in FIG. 4, a scattering anisotropic film supply roll 9 for supplying a long scattering anisotropic film 1 and a polarizing plate for supplying a long polarizing film 8 Film supply roll 10, protective film take-up roll 11 for taking up a protective film, cover film take-up roll 12 for taking up a cover film, long scattering anisotropic film 1 and long polarizing film 8 is provided with a laminating roll unit 13 for laminating and laminating 8 and a film winding roll 14 for winding the laminated film.
[0058]
First, the long scattering anisotropic film 1 and the long polarizing film 8 are set in a state of being wound around the scattering anisotropic film supply roll 9 and the polarizing film supply roll 10, respectively.
[0059]
The scattering anisotropic film 1 set on the scattering anisotropic film supply roll 9 has a protective film for preventing scratches bonded to one side.
[0060]
Moreover, the polarizing film 8 set to the polarizing film supply roll 10 has an adhesive layer and a cover film bonded in advance on one side.
[0061]
Next, before the scattering anisotropic film 1 unwound from the scattering anisotropic film supply roll 9 enters the laminate roll section 13, the protective film 15 is wound up by the protective film winding roll 11 and peeled off.
[0062]
Moreover, before the polarizing film 8 unwound from the polarizing film supply roll 10 enters into the lamination roll part 13, the cover film 16 is wound up and peeled off by the cover film winding roll 12, and an adhesive layer is exposed.
[0063]
Next, the pressure-sensitive adhesive layer surface of the polarizing film 8 and the scattering anisotropic film 8 are brought into close contact with each other by passing through the laminating roll 13 and are bonded together.
[0064]
Finally, the film bonded by the laminating roll unit 13 is taken up by the film take-up roll 14 and the long polarizing film 8 and the long scattering anisotropic film 1 are integrated. Film 7 is obtained.
[0065]
As described above, the polarizing plate film 8 and the scattering anisotropic film 1 can be bonded in a long state using a laminator.
[0066]
Here, the polarizing film 8 includes, for example, a polarizing element (for example, iodine or dye) that imparts dichroism, a polarizing substrate (for example, polyvinyl alcohol = PVA) for arranging and fixing the polarizing element, and a polarizing substrate on both sides. It can comprise from the board | substrate (For example, triacetylcellulose = TAC) protected from.
[0067]
When PVA is stretched in a certain direction, dichroic substances such as iodine and dye are diffused and adsorbed and oriented, polarization characteristics can be obtained. In order to protect this PVA, it can be formed by a method in which TAC is bonded in a sandwich form from both sides with an adhesive.
Next, in the laminated film 7 and the manufacturing method thereof according to the present embodiment as described above, the long scattering anisotropic film 1 and the long polarizing film 8 are combined with the respective films 1 and 8. When the polarizing plate is attached to the liquid crystal panel as in the conventional case, it is laminated in a state in which the flow directions of the layers are matched, and is adhered by laminating closely. Because it is possible to eliminate the need for an extremely troublesome and time-consuming work such as cutting and pasting a long film obliquely with respect to the flow direction of the film. The laminated film 7 having the scattering characteristics and the polarization characteristics can be manufactured very easily without much trouble and with high work efficiency.
[0068]
As described above, in the laminated film 7 and the manufacturing method thereof according to the present embodiment, the laminated film 7 having anisotropic light scattering characteristics can be manufactured very easily without much effort and with high work efficiency. It becomes possible.
[0069]
(Other embodiments)
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention at the stage of implementation.
For example, in each of the above-described embodiments, an example in which a mask that modulates electromagnetic waves using a transmission part and a non-transmission part is used as the mask has been described. However, the present invention is not limited to this. A mask that modulates the phase of various electromagnetic waves may be used.
[0070]
Further, in each of the above embodiments, the scattering anisotropic film has been described as an example where it is located on the front surface (observation side surface) of the liquid crystal panel. It may be located on the back (side opposite to the observation side).
[0071]
In this case, it is used by being bonded together with a polarizing plate, a compensation plate and the like on the back surface of the liquid crystal panel.
[0072]
In addition, the embodiments may be implemented in appropriate combinations as much as possible, and in that case, combined effects can be obtained.
Further, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements.
For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem (at least one) described in the column of the problem to be solved by the invention can be solved, and the effect of the invention can be solved. When (at least one of) the effects described in the column can be obtained, a configuration in which this configuration requirement is deleted can be extracted as an invention.
[0073]
【The invention's effect】
As described above, according to the scattering anisotropic film of the present invention and the method for producing the same, the scattering anisotropic film having anisotropic light scattering characteristics is not troublesome, has high work efficiency, and is extremely easy. Can be manufactured.
[0074]
Furthermore, according to the laminated film of the present invention and the method for producing the same, it is possible to produce a laminated film having anisotropic light scattering characteristics and polarization characteristics without much time and work efficiency and very easily. It becomes.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration example of a scattering anisotropic film according to a first embodiment of the present invention.
FIG. 2 is a schematic diagram showing a specific configuration example for realizing the method for producing a scattering anisotropic film according to the first embodiment.
FIG. 3 is a cross-sectional view showing a configuration example of a laminated film according to a second embodiment of the present invention.
FIG. 4 is a schematic diagram showing a specific configuration example for realizing the method for manufacturing a laminated film according to the second embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Scattering anisotropic film 1A ... Flow direction 1B of scattering anisotropic film 1 ... Axial direction 2 of light scattering characteristic of scattering anisotropic film 1 ... Light source 3 ... Lens 4 ... Mask 5 ... Long photosensitive material Film 5A ... Flow direction of the long photosensitive material film 61 ... Long photosensitive material unwinding roll 62 ... Long photosensitive material winding roll 7 ... Laminated film 8 ... Polarizing film 9 ... Scattering anisotropic film supply roll DESCRIPTION OF SYMBOLS 10 ... Polarizing film supply roll 11 ... Protective film winding roll 12 ... Cover film winding roll 13 ... Laminate roll part 14 ... Film winding roll 15 ... Protective film 16 ... Cover film.

Claims (1)

Attached to the liquid crystal panel of a liquid crystal display device that changes the display pattern by modulating the transmission / non-transmission of incident light according to the applied voltage, and has different scattering properties according to changes in the incident angle of incident light Method for producing a laminated film in which a long scattering anisotropic film having anisotropy in light scattering characteristics and a long polarizing film having a direction inclined with respect to the side of the liquid crystal panel are laminated In
And occur source you generate electromagnetic waves, between the elongated photosensitive film to react to the electromagnetic wave, a mask for modulating the electromagnetic waves are arranged,
Before Symbol state and photosensitive film mask with the elongated relatively fixed with and against the flow direction of the long-shaped photosensitive film, the inclination of the polarizing plate film axis relative side of the liquid crystal panel Irradiating the electromagnetic wave to the long photosensitive material film at an angle substantially equal to an angle to produce a long scattering anisotropic film,
The long polarizing film is flowed so as to coincide with the flow direction of the long scattering anisotropic film,
The production of a laminated film characterized in that the long scattering anisotropic film and the long polarizing film are adhered in a laminated manner and bonded together in a long state. Method.

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