JP3371974B2 - Liquid crystal display device and manufacturing method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film substrate used in a liquid crystal display device and a method for manufacturing the same.
Further, the present invention relates to a liquid crystal display device using this film substrate.

[0002]

2. Description of the Related Art FIG. 1 shows a conventional liquid crystal display device. In a conventional liquid crystal display device, liquid crystal is enclosed via a spacer 4 in a pair of glass substrates 1 to which a polarizing plate 2 is attached, and a transparent electrode 3 provided inside these glass substrates.
By applying a voltage to the liquid crystal, the display is performed by the difference in the polarization axes of the light passing through the liquid crystal and the light polarized by the polarizing plate.

[0003]

However, since the conventional liquid crystal display device uses glass for the substrate, the weight of the liquid crystal display device increases and it is not suitable for portable equipment such as a notebook computer and a palm top computer. .

Further, even when the liquid crystal display device is used for an information display device other than the portable device or the portable device such as a notebook computer and a palm top computer, it is resistant to the liquid crystal display device due to an unexpected situation. When a force is applied, there is an inconvenience that the glass substrate breaks, and furthermore, a polarizing plate has to be attached onto this glass substrate.

[0005]

According to a first liquid crystal display device of the present invention, a film containing a photocurable material is stretched uniaxially, and at least one substance selected from iodine, a dye and polyene is added. A film substrate having a function of a polarizing plate by including it is provided. In the above liquid crystal display device, it is preferable that the photocurable material is an ultraviolet curable material. In the second liquid crystal display device of the present invention, a film containing a thermosetting material is uniaxially stretched and contains at least one substance selected from iodine, dyes, and polyenes so as to function as a polarizing plate. It is equipped with a film substrate. The liquid crystal display device may further include a switching element, and the switching element may be formed by a printing method. A method for manufacturing a liquid crystal display device according to the present invention comprises a step of uniaxially stretching a thermosetting material or a photocurable material to form a substrate, and at least one of iodine, a dye-based substance, and polyene on the substrate. And a step of imparting the function of a polarizing plate to the substrate. The method for manufacturing a liquid crystal display device described above further includes a step of forming a switching element by a printing method.

[0006]

EXAMPLE FIG. 2 is a diagram schematically showing a film substrate used in the liquid crystal display device of the present invention. The composition that forms the basis of this film substrate includes thermosetting resins such as polydiethylene glycol bisallyl carbonate, polyethylene glycol di (meth) acrylate, and polypropylene glycol di (meth) which are di (meth) acrylate monomers.
There is UV curable resin such as accrete.

The film substrate 5 shown in FIG. 2 is obtained by thinly stretching these cured resins to form a film, or by coating these cured resins on a flexible substrate such as polyimide such as polyimide or PVA. Is made of a mixture of polyimide, PVA, etc. and the cured resin 6 and stretched into a film.

The cured resin 6 in the film state is a state in which the monomer or polymer is not polymerized or a polymer in which the monomer or polymer is polymerized to the extent that the flexible state of the film substrate is maintained, and is stretched into a film.

In the present invention, the film substrate of FIG. 2 is wound in a flexible state in a roll shape, and the steps of forming display electrodes, forming color filters and the like are performed without cutting the film substrate, and then the film substrate is removed. The liquid crystal display device of the present application is one in which a liquid crystal display device is formed by being cured by heat, ultraviolet rays, or the like and used as one or both of upper and lower substrates that sandwich a liquid crystal.

In this case, a method of forming a display electrode, a color filter, etc. after stretching and curing a film substrate wound in a roll, starting to form these in a flexible state of the film substrate, Either a method of gradually curing the film substrate with heat or light, or a method of curing the film substrate with heat or light after forming them.

Further, a switching element formed by a low temperature or printing method such as an MIM element, a FEMT element (Japanese Patent Laid-Open Publication) or a thin film transistor may be formed without cutting the film substrate. Also in this case, a method of forming these switching elements after curing the film substrate, starting to form these elements in a flexible state of the film substrate, and gradually curing the film substrate by heat or light in the formation process Any of the method and the method of curing the film substrate by heat or light after forming these elements may be used.

FIG. 3 shows the film substrate of FIG. 2 mixed with iodine or the like and stretched uniaxially. Substances to be mixed in the film substrate include iodine, dye-based substances, polyenes and the like.

The uniaxially stretched film substrate of the present invention may be dipped in a solution of iodine, a dye-based substance, polyene or the like so as to have characteristics as a polarizing plate.

By making the film substrate in this way, it is possible to form the film substrate having the polarization axis 7 in the direction ⇔.

The stretching direction of the film substrate is determined by the properties of the liquid crystal sandwiched between the upper and lower substrates of the liquid crystal display device. In FIG. 3, the film substrate has a polarization axis in the winding direction. May be in the vertical direction or may have a polarization axis in any other direction, and the polarization axis depends on the properties of the liquid crystal sandwiched between the upper and lower substrates of the liquid crystal display device.

FIG. 4 shows a liquid crystal display device in which a liquid crystal display device is formed by using the film substrate of the present application as one of or upper and lower substrates for sandwiching liquid crystal. The film substrate in the present application does not need a polarizing plate because the film substrate itself has the function of a polarizing plate.

FIG. 5 is a view showing a state 8 in which the film substrate 5 of the present application is wound in a roll shape. As shown in Fig. 4, put iodine, dye-based substance, polyene, etc. in the film substrate,
When the film substrate stretched in the uniaxial direction is wound into a roll, the film has a polarization axis 7 in the direction ⇔.

[0018]

EFFECTS OF THE INVENTION A film substrate containing a cured resin that does not crack is used. Since this film substrate has a function of a polarizing plate, it is easier to handle than a glass substrate, and a liquid crystal display device can be manufactured at a low cost. Can be manufactured.

Furthermore, a portable device such as a notebook computer or a palm-top computer using a liquid crystal display device can be constructed in a light weight, and the substrate is not broken, so that it is excellent in safety.

[Brief description of drawings]

FIG. 1 is a diagram showing a conventional liquid crystal display device.

FIG. 2 is a diagram showing a film substrate containing a resin that is cured by light or heat.

FIG. 3 is a diagram showing a film substrate of the present invention having a polarization direction.

FIG. 4 is a diagram showing a liquid crystal display device using the film substrate of the present application.

FIG. 5 is a diagram showing a state in which the film substrate of the present application before being cured is wound into a roll.

[Explanation of symbols]

1 ... Glass substrate 2 ... Polarizing plate 3 ... Electrode 4 ... Spacer 5: Film substrate 6 ... Cure resin by light or heat 7 ... Polarization direction 8: Film substrate rolled into a roll

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G02F 1/1333 500

Claims (6)

(57) [Claims] 1. A film substrate comprising a photocurable material, which is uniaxially stretched, and which has the function of a polarizing plate by containing at least one substance selected from iodine, dyes and polyenes. Liquid crystal display device. 2. The liquid crystal display device according to claim 1, wherein the photocurable material is an ultraviolet curable material. 3. A film substrate comprising a thermosetting material, which is uniaxially stretched and has a function of a polarizing plate by containing at least one substance selected from iodine, dyes and polyenes. Liquid crystal display device. 4. The liquid crystal display device according to claim 1, further comprising a switching element, wherein the switching element is formed by a printing method. 5. A step of uniaxially stretching a thermosetting material or a photocurable material to form a substrate, and the substrate containing at least one of iodine, a dye-based substance, and polyene, A step of imparting a polarizing plate function to the substrate,
A method for manufacturing a liquid crystal display device, comprising: 6. The method for manufacturing a liquid crystal display device according to claim 5, further comprising a step of forming a switching element by a printing method.