JP3108602B2 - Manufacturing method of liquid crystal display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device used as a display for electronic equipment and the like.
More specifically, the present invention relates to a method for manufacturing a liquid crystal display device using a ferroelectric polymer liquid crystal.

[0002]

2. Description of the Related Art As a general alignment processing method in a conventional method of manufacturing a liquid crystal display device using a ferroelectric liquid crystal material, a method of aligning a liquid crystal optical element disclosed in JP-A-5-289080 is disclosed. And its device ".

Here, the orientation treatment method will be described with reference to FIG. First, a ferroelectric liquid crystal material is sandwiched between two flexible electrode substrates formed by patterning a transparent electrode made of ITO or the like in a stripe shape.
0 is produced.

As shown in FIG. 6, the liquid crystal display panel 40 is sandwiched between an upper belt 32a for applying a positive voltage with electrodes and a belt 34a for applying a negative voltage with electrodes, and together with the conductive belts 32a, 34a. , Guide roller 32
b, 32c, 34b, 34c, positive voltage applying roller 32
d, using the negative voltage applying roller 34d and the orientation roller section 36 to convey the inside of the orientation processing apparatus.

At this time, the liquid crystal display panel 40 is conveyed while changing the suspension direction for each of the alignment rollers 36 so that the front and back surfaces of the liquid crystal display panel 40 alternately contact the front side of the alignment rollers 36. In this state, the ferroelectric liquid crystal material is oriented by applying an electric field and a shear stress due to bending deformation while applying a voltage between the electrodes of the liquid crystal display panel 40.

[0006]

However, according to the alignment processing method disclosed in Japanese Patent Application Laid-Open No. Hei 5-289080 described in the related art, as described above, an electric field is applied to the transparent electrode pattern formed on the liquid crystal display panel. Since the shear stress is applied, the applied electric field differs between the portion where the transparent electrode pattern is formed and the portion where the transparent electrode pattern is not formed, and therefore, depending on the shape of the transparent electrode pattern,
There has been a problem that sufficient alignment uniformity cannot be obtained.

In addition, a shear stress due to bending deformation is applied between two flexible electrode substrates formed by patterning a transparent electrode in a stripe shape while holding a ferroelectric liquid crystal material. In addition, problems such as disconnection of the transparent electrode pattern and increase in resistance value have occurred.

The present invention was made to solve the above problems, and an object thereof collector
The alignment process is performed while the ferroelectric polymer liquid crystal is sandwiched between the polar substrate and the separator sheet, and then the ferroelectric polymer liquid crystal layer is sandwiched between the electrode substrates. Another object of the present invention is to provide a liquid crystal display device using a ferroelectric polymer liquid crystal which is excellent in alignment uniformity and productivity, and which is very thin and light.

[0009]

[0010]

A method of manufacturing a liquid crystal display device according to the present invention is a method of manufacturing a liquid crystal display device in which a ferroelectric polymer liquid crystal is sandwiched between two electrode substrates having transparent electrodes. , The one having a stripe-shaped transparent electrode
The ferroelectric polymer liquid crystal was clamped, the stripe-like transparent conductive in that state between the sheets of electrode substrates and the separator sheet
Applying a shear stress in a direction parallel to the polar pattern to perform orientation processing; separating the separator sheet from the oriented ferroelectric polymer liquid crystal; and A step of attaching another electrode substrate having a transparent electrode to the surface from which the separator sheet of the conductive polymer liquid crystal has been peeled off, thereby achieving the object described above.

[0011]

[0012]

[0013]

[0014]

[0015]

According to the present invention, sandwiching the ferroelectric polymer liquid crystal between one and the electrode substrate which stripe-shaped transparent electrode is formed, a single separator sheet conductive film is formed, When performing an orientation process in which an electric field or shear stress is applied in that state, bending stress applied to the transparent electrode pattern is suppressed by applying a shear stress in a direction parallel to the stripe-shaped transparent electrode pattern. In this way, it is possible to apply a stronger alignment shear stress to the ferroelectric polymer liquid crystal.

Further, when the alignment treatment is performed in a state where the ferroelectric polymer liquid crystal is sandwiched between the electrode substrate and the separator sheet , by controlling the temperature, the ferroelectric polymer liquid crystal can be effectively treated. It becomes possible to apply an electric field, shear stress, and the like.

Further , by providing a very thin release treatment layer on the conductive film formed on the surface of the separator sheet, the releasability when the separator sheet is peeled from the oriented ferroelectric polymer liquid crystal layer is improved. It can be improved.

[0018]

EXAMPLES Hereinafter, the method for manufacturing a liquid crystal display device of the present invention will be described in detail with reference to examples, but the present invention is not limited thereto. For example, a plastic film, a plastic sheet, glass substrate,
A hard coat layer, a gas barrier layer, an undercoat layer, and the like may be formed on the polarizing plate and the reflector-integrated polarizing plate.

[0019] Reference Example 1 FIG. 1 is a cross-sectional view schematically showing a state 6 where the ferroelectric polymer liquid crystal in the present reference example is sandwiched by two separator sheets, FIG. 3, the present embodiment FIG. 2 is a schematic cross-sectional view of the completed liquid crystal display panel 10. In the figure, 1, 1 'is a polycarbonate film, 2 and 2' are conductive films, 3 is a ferroelectric polymer liquid crystal, and 4 and 4 'are the polycarbonate films 1, 1' and the conductive films 2, 2 '. And 7 and 7 ′ are polyethersulfone films, 8 and 8 ′ are transparent electrodes, 13 is an ultraviolet-curable sealing material, and 9 and 9 ′ are polyethersulfone films 7, 7 ′. 2 shows a liquid crystal display panel substrate including the transparent electrodes 8 and 8 ′.

[0020] In the present example, with a thickness of 0.1mm 2
A molybdenum (Mo) film was formed as a conductive film 2 and 2 'on one surface of each of the polycarbonate films 1 and 1' by a magnetron sputtering method to produce two separator sheets 4 and 4 '.

At this time, on the conductive films 2, 2 'formed on the surfaces of the two separator sheets 4, 4', a silicone-based release layer as a very thin release treatment layer is heated after offset printing. Produced.

Next, a material obtained by dissolving the ferroelectric polymer liquid crystal material 3 with a solvent to increase the fluidity was applied to the conductive film 2 of the one separator sheet 4 by a microgravure method.

In this case, as the ferroelectric liquid crystal material 3,
For example, one or more ferroelectric polymer liquid crystal materials,
Ferroelectric polymer liquid crystal material composed of one or more ferroelectric polymer liquid crystal materials and one or more ferroelectric low molecular liquid crystal materials, one or more ferroelectric low molecular liquid crystal materials And a ferroelectric polymer liquid crystal material composed of one or more kinds of other polymer liquid crystal materials. That is, the ferroelectric polymer liquid crystal material used in the present embodiment is not limited to a ferroelectric polymer liquid crystal material in which the polymer molecules themselves exhibit ferroelectric liquid crystal characteristics, but also a polymer liquid crystal material in which all the ferroelectric properties are exhibited. It is possible to use, for example, acrylate main chain liquid crystal polymer, methacrylate main chain liquid crystal polymer, chloroacrylate main chain liquid crystal polymer, oxirane main chain liquid crystal polymer, siloxane main chain liquid crystal polymer, siloxane-olefin Main chain liquid crystal polymers, ester main chain liquid crystal polymers, and the like can be given. Among such ferroelectric polymer liquid crystal materials, it is preferable to use a side chain type ferroelectric polymer liquid crystal material having a chiral smectic C phase. Further, the ferroelectric polymer liquid crystal material at this time may contain an adhesive, a viscosity reducing agent, a non-liquid crystal chiral compound, a dye, and the like, if necessary.

Thereafter, after the solvent in the ferroelectric polymer liquid crystal material 3 is evaporated, the other separator sheet 4
Was attached so that the conductive film 2 ′ side of the separator sheet 4 ′ was in contact with the surface of the ferroelectric polymer liquid crystal 3.

The ferroelectric polymer liquid crystal 3 thus obtained is sandwiched between two separator sheets 4 and 4 ', and an electric field and mechanical alignment method is applied to the two separator sheets. The alignment treatment was performed on the ferroelectric polymer liquid crystal layer 3 sandwiched between 4, 4 '.

A specific orientation treatment method at this time is shown in FIG.
As shown in the figure, a ferroelectric polymer liquid crystal 3 sandwiched between two separator sheets 4 and 4 ′ is sandwiched between two transporting and voltage applying belts 12 and 12 ′,
A state in which the ferroelectric polymer liquid crystal 3 is sandwiched between two separator sheets 4 and 4 ′ on the surface side of a plurality of alignment rollers 11 together with the conveyance and voltage application belts 12 and 12 ′. 6 so that the front and back surfaces of the ferroelectric polymer liquid crystal 3 are alternately brought into close contact with each other. The ferroelectric liquid crystal material 3 was subjected to an orientation treatment by applying an electric field and a shear stress due to bending deformation while applying a voltage to the ferroelectric liquid crystal material 6 held in the state.

In the present reference example, the viscosity of the liquid crystal layer was adjusted by controlling the temperature of the alignment roller so that shearing stress could be effectively applied to the liquid crystal layer during the above-mentioned alignment treatment.

On the other hand, transparent electrodes 8 and 8 'were formed on one surface of two polyethersulfone films 7 and 7' having a thickness of 0.1 mm by ITO (Ind.
(Im Tin Oxide) films were formed to produce two liquid crystal display panel substrates 9 and 9 ′.

Next, the separator sheets 4 and 4 ′ are peeled off from the state 6 in which the ferroelectric polymer liquid crystal 3 subjected to the alignment treatment is sandwiched between two separator sheets 4 and 4 ′. As shown in FIG. 3, the liquid crystal display panel substrates 9 and 9 ′ are attached to both surfaces of the ferroelectric polymer liquid crystal 3 exposed after peeling so that the transparent electrodes 8 and 8 ′ face each other. Thus, the liquid crystal display panel 10 was manufactured.

At this time, the liquid crystal display panel substrates 9, 9
′ At the time of sticking to the ferroelectric polymer liquid crystal 3
A UV curable resin having flexibility even after curing is applied as a sealant 13 to the outer peripheral portion of one of the liquid crystal display panel substrates 9 and 9 ′, and ultraviolet light is applied after the resin is applied to seal the seal. Material 13 was cured.

[0031] Thereafter, pasting a polarizing plate on the display surface side of the liquid crystal display panel 10, by attaching a reflective plate integrated polarizing plate on the back side, to produce a liquid crystal display device of this embodiment.

In the present invention, but may be a transmission type liquid crystal display device having a light source, in order to utilize the feature of lighter is very thin, the liquid crystal display of reflection type as described in the present embodiment The device is preferred.

Reference Example 2 FIG. 4 is a schematic cross-sectional view of a liquid crystal display panel 16 completed according to this reference example. In the figure, 3 is a ferroelectric polymer liquid crystal, 7 is a polyether sulfone film, 8 , 8 ′ are transparent electrodes, 9 is a liquid crystal display panel substrate comprising the polyether sulfone film 7 and the transparent electrode 8, 14 is a glass substrate for liquid crystal display panel, 15 is a glass substrate for liquid crystal display panel 14 and the transparent The figure shows a liquid crystal display panel substrate composed of electrodes 8 '.

[0034] In this reference example, after the alignment treatment of the ferroelectric polymer liquid crystal 3, as shown in FIG. 4, a thickness of 0.1mm polyether - photolithography as a transparent electrode 8 on one side of ether sulfone film 7 A liquid crystal display panel substrate 9 having an ITO film formed thereon, and a liquid crystal display panel substrate 15 having a 0.7 mm thick liquid crystal display panel glass substrate 14 having an ITO film formed on one surface thereof as a transparent electrode 8 using a photolithographic method. A liquid crystal display device was manufactured in the same manner as in Reference Example 1 except that was combined.

[0035] EXAMPLES 5 is a schematic cross-sectional view showing a clamped state 17 in a ferroelectric polymer liquid crystal in the present embodiment and the separator sheet and the liquid crystal display panel, in the drawing, 1 is polycarbonate Film 2, a conductive film, 3 a ferroelectric polymer liquid crystal, 4 a separator sheet comprising the polycarbonate film 1 and the conductive film 2, 7 ′ a polyether sulfone film, 8 ′ a transparent electrode , 9 'denotes a liquid crystal display panel substrate comprising the polyether sulfone film 7' and the transparent electrode 8 '.

In this embodiment, a transparent electrode 8 is provided on one side of a polyethersulfone film 7 'having a thickness of 0.1 mm.
An 'film was formed in the form of a stripe by using a photolithography method as a' to prepare a liquid crystal display panel substrate 9 '.

Further, a molybdenum (Mo) film was formed as a conductive film 2 on one side of a polycarbonate film 1 having a thickness of 0.1 mm by a magnetron sputtering method, and a separator sheet 4 was produced.

Next, a material obtained by dissolving the ferroelectric polymer liquid crystal material 3 with a solvent to increase the fluidity was applied to the transparent electrode 8 'of the liquid crystal display panel substrate 9' by a microgravure method.

Thereafter, after the solvent in the ferroelectric polymer liquid crystal material 3 was evaporated, the separator sheet 4 was attached so that the conductive film 2 side of the separator sheet 4 was in contact with the surface of the ferroelectric polymer liquid crystal 3. .

The ferroelectric polymer liquid crystal 3 thus obtained is sandwiched between the liquid crystal display panel substrate 9 ′ and the separator sheet 4, and an electric field and a dynamic alignment method are applied to the liquid crystal display panel 17. The alignment treatment was performed on the ferroelectric polymer liquid crystal layer 3 sandwiched between the substrate 9 ′ and the separator sheet 4.

In this case, a specific alignment treatment method is to apply a mechanical alignment (shear stress) in a direction parallel to the pattern direction of the transparent electrode 7 'formed on the liquid crystal display panel substrate 9'. Other than that, the same method as in Reference Example 1 was used.

On the other hand, an ITO film was formed as a transparent electrode 8 on one side of a polyethersulfone film 7 having a thickness of 0.1 mm by a photolithography method, and a liquid crystal display panel substrate 9 similar to that of Reference Example 1 was produced. .

Next, only the separator sheet 4 is separated from the liquid crystal display panel substrate 9 'and the separator sheet 4 in which the ferroelectric polymer liquid crystal 3 subjected to the alignment treatment is sandwiched between the liquid crystal display panel substrate 9' and the separator sheet 4. As shown in FIG. 3, on the surface of the ferroelectric polymer liquid crystal 3 exposed after peeling, the liquid crystal display panel substrate 9 is provided with the transparent electrode 8 and the liquid crystal display panel substrate 9.
The liquid crystal display panel 10 is adhered by the same method as in Reference Example 1 so as to face the transparent electrode 8 ′ of the liquid crystal display panel 10 ′.
Was prepared.

Thereafter, a polarizing plate was attached to the display surface side of the liquid crystal display panel 10 and a reflector-integrated polarizing plate was attached to the back surface side, whereby the liquid crystal display device of this embodiment was manufactured.

[0045]

[0046]

[0047]

In the present invention, sandwiched ferroelectric polymer liquid crystal and between the plastic film separator sheet and the transparent electrode of one conductive film formed on its surface,
After performing the alignment treatment in that state, only the separator sheet is peeled off, and a method of attaching a regular electrode substrate to the exposed ferroelectric polymer liquid crystal surface is used. There is an effect that there is.

By applying a shearing stress in a direction parallel to the transparent electrode pattern formed on the plastic film during the application of the shearing stress during the orientation treatment, the transparent electrode pattern may be disconnected or the resistance value may be increased. Strong shear stress can be applied while preventing problems,
As a result, it is possible to obtain a liquid crystal display panel having a strong alignment control force against deformation.

Further, since the conductive film formed on the surface of the separator sheet (the surface in contact with the ferroelectric polymer liquid crystal) does not need to be transparent, a metal film having a low resistance value and excellent malleability is selected. However, since it is only necessary to form the separator sheet very thin, the separator sheet with the conductive film is unlikely to cause a problem such as disconnection of the conductive film or an increase in the resistance value even by deformation or bending, and a stronger orientation shear stress is applied to the ferroelectric material. It can be applied to molecular liquid crystals.

Further, since the separator sheet with the conductive film used in the present invention can be used repeatedly, it can be operated at a low cost and always performs a uniform alignment treatment regardless of the shape of the transparent electrode pattern of the liquid crystal display panel. The present invention can be applied to a substrate material, such as glass, which is difficult to apply shear stress due to deformation.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a state in which a ferroelectric polymer liquid crystal in a reference example of the present invention is sandwiched between two separator sheets.

FIG. 2 is a schematic sectional view illustrating an alignment treatment method according to a reference example of the present invention.

FIG. 3 is a schematic sectional view of a liquid crystal display panel manufactured according to an example of the present invention.

FIG. 4 is a schematic cross-sectional view of a liquid crystal display panel manufactured according to a reference example of the present invention.

FIG. 5 is a schematic cross-sectional view showing a state in which a ferroelectric polymer liquid crystal is sandwiched between a liquid crystal display panel substrate and a separator sheet in an example of the present invention.

FIG. 6 is a schematic cross-sectional view showing a general alignment processing method in a conventional method of manufacturing a liquid crystal display device using a ferroelectric liquid crystal material.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 polycarbonate film 1 ′ polycarbonate film 2 conductive film 2 ′ conductive film 3 ferroelectric polymer liquid crystal 4 separator sheet 4 ′ separator sheet 6 ferroelectric polymer liquid crystal sandwiched between two separator sheets 7 polyether sulfone film 7 'Polyether sulfone film 8 Transparent electrode 8' Transparent electrode 9 Liquid crystal display panel substrate 9 'Liquid crystal display panel substrate 10 Liquid crystal display panel 11 Orientation roller 12 Transport and electric field applying belt 12' Transport and electric field applying belt 13 Sealing material 14 Liquid crystal display Panel glass substrate 15 Liquid crystal display panel substrate 16 Liquid crystal display panel 17 Ferroelectric polymer liquid crystal sandwiched between liquid crystal display panel substrate and separator sheet 32 Positive electric field applying section 32a Upper belt for applying positive voltage with electrodes 32b Guide roller 32c Idorora 32d positive voltage application roller 34 negative electric field applying part 34a negative voltage applied with the electrode lower belt 34b guide roller 34c guide rollers 34d negative voltage application roller 36 alignment rollers 40 liquid crystal display panel E voltage source

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G02F 1/1337 G02F 1/1333 G02F 1/1343 G02F 1/13 101 G02F 1/141

Claims (1)

(57) [Claims] 1. A method according to claim 1, further comprising the steps of:
The method of manufacturing a liquid crystal display device which is formed by sandwiching a ferroelectric polymer liquid crystal, the ferroelectric polymeric liquid crystal between one of the electrode substrate and the separator <br/> rater sheet having a stripe-shaped transparent electrodes To the striped transparent electrode pattern.
Applying a shearing stress in a parallel direction to perform an alignment process; separating the separator sheet from the aligned ferroelectric polymer liquid crystal; and separating the ferroelectric polymer liquid crystal separator sheet. Adhering another electrode substrate having a transparent electrode to the surface thus formed.