JP3059866B2 - Substrate for 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 display device which can be suitably used for a display device such as a STN (super twisted nematic) type liquid crystal display device, a two terminal element liquid crystal display device, and a three terminal element liquid crystal display device. Regarding the substrate.

[0002]

2. Description of the Related Art Conventionally, as a large-area or medium-area display device used for information equipment, communication equipment, AV (audio and visual) equipment, game equipment and the like, ST.
N-type liquid crystal display, MIM (Metal Insulator Metal)
There are a liquid crystal display device and a TFT (thin film transistor) liquid crystal display device. As a substrate of these liquid crystal display devices, a borosilicate glass plate having a thickness of 0.7 mm, a thickness of 1 mm
Alternatively, a soda-lime glass plate having a thickness of 0.7 mm and a non-alkali glass plate having a thickness of 1.1 mm are used. Further, a substrate using a glass plate having a thickness of 0.5 mm has been studied. However, in recent years, in order to reduce the thickness and weight of the information devices, communication devices, AV devices, game devices, and the like, display devices provided in these devices have been reduced in thickness and weight. For example, it is proposed to use a plastic substrate such as PES (polyethersulfone), polyarylate, polycarbonate, epoxybutadiene copolymer and norbornene-based resin as a substrate of the display device to reduce the thickness and weight of the display device. Have been.

FIG. 14 is a sectional view showing the structure of a display device substrate 5 disclosed in Japanese Patent Application Laid-Open No. 61-86252. As shown in FIG. 14, the substrate 5 is a 100 μm thick transparent plastic film 1 made of a PES film having excellent heat resistance, and has a 5 μm thick PVA undercoated with a 2 μm thick urethane resin as an undercoat. A gas barrier coat 2 made of (polyvinyl alcohol) resin is provided. A protective coat 3 made of an epoxy resin having a thickness of 3 μm is provided thereon. On the other surface of the transparent plastic film 1, an undercoat 4 of a transparent conductive film made of indium oxide having a thickness of 5 μm was formed.
m is coated with an epoxy acrylate resin.

In order to reduce the thickness and weight of a display device such as a liquid crystal display device, as disclosed in Japanese Patent Application Laid-Open Nos. 61-116331 and 61-116332, a display device is formed on a substrate. It has been proposed to previously form an optical member such as a polarizing film.

FIG. 15 is a sectional view showing the structure of a polarizing plate integrated substrate 16 disclosed in Japanese Patent Application Laid-Open No. 61-116331. As shown in FIG. 15, a polarizing plate 12 in which dye molecules are adsorbed to a uniaxially stretched PVA film is bonded to one surface of a PES film 11 having a thickness of 50 μm via a urethane-based adhesive 13. Laminated on this, 50 μm thick TAC (triacetyl cellulose) containing an ultraviolet absorber
The film 14 is made of urethane-based adhesive 1 as a protective coat.
3 are pasted together. The PES film 1
On the other surface of the substrate 1, an undercoat 15 of a transparent conductive film made of indium oxide is provided.

Also, JP-A-59-224876 and "Penz, PA. Et al., SID'81 Digests, 11.7, pp. 116-118, Ap.
r.1981 ”, other than PES film,
A substrate using an axially stretched polyester film and a substrate using a phenoxy-based film have been proposed.

[0007]

However, in the display device substrate 5 shown in FIG. 14, when a transparent electrode is formed on the undercoat 4 and a liquid crystal cell manufacturing process is performed, disconnection of the electrode is likely to occur. Further, there is a problem that air bubbles are easily generated in a liquid crystal cell filled with liquid crystal, and sufficient display reliability cannot be obtained.

A display device substrate 16 shown in FIG.
Is made of thin plastic, the strength of the substrate 16 is low, and it is difficult to make the cell thickness uniform when a liquid crystal cell such as an STN liquid crystal display device is formed. For this reason, there is a problem that color tone unevenness of the liquid crystal cell easily occurs.

Further, when the display device substrate 16 is subjected to a liquid crystal cell manufacturing process or the like, there is a problem that dimensional changes due to thermal stress are caused in steps such as heat treatment, and disconnection of the transparent electrode is likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to realize a thin and lightweight display device, and to improve the display quality, display reliability, and pen input tablet of another display device. An object of the present invention is to provide a display device substrate that can improve the usability.

[0011]

SUMMARY OF THE INVENTION The present invention provides at least one
On both sides of the plate-like body layer including the adhesive light-transmitting resin layer, the thickness having a light-transmitting property is not less than 0.0015 mm and not more than 0.25 mm.
Ri Na pair of ultra-thin glass sheet is fully is laminated, the plate
The body layer has a thickness of at least one sheet of the ultra-thin glass plate.
A display device substrate characterized in that:

[0012]

[0013]

[0014]

[0015]

[0016]

[0017]

[0018]

[0019]

[0020]

[0021]

[0022]

[0023]

According to the present invention, a display device substrate comprises a pair of ultra-thin glass plates having a light-transmitting property laminated on both surfaces of a plate-like body layer including at least one adhesive light-transmitting resin layer. It becomes. In particular, the thickness of the ultra-thin glass plate is 0.25 mm
By setting the ratio to less than that, a display device substrate which is thinner and lighter than a conventional glass substrate can be manufactured. Further, since the display device substrate is provided with ultra-thin glass plates on both surfaces, the substrate surface is hardly damaged, and it is possible to prevent air from passing through the substrate. Further, heat resistance and chemical resistance of the substrate can be improved. Further, since the thermal expansion of the substrate can be suppressed low, disconnection of the electrode due to the thermal expansion of the substrate can be prevented. Further, since the strength of the substrate can be increased, the cell thickness of the liquid crystal cell can be made uniform, and the display uniformity of the liquid crystal cell can be improved.

According to the invention, the ultra-thin glass plate of the display device substrate has a thickness of 0.0015 mm or more and 0.25 mm or more.
mm.

[0025] According to the present invention, a pair of ultra-thin glass plate substrate for a display device, a surface comprising at least one ultra-thin glass sheet substrate outer surface is that the polishing is applied
Is preferred. According to this configuration, by disposing the pair of display device substrates so that the polished surfaces face each other and sealing the liquid crystal, the cell thickness of the liquid crystal cell can be made uniform with high accuracy, and display unevenness can be improved. No liquid crystal display device can be formed.

According to the present invention, of the pair of ultra-thin glass plates of the display device substrate, at least one of the ultra-thin glass plates is provided with irregularities on the outer surface of the substrate.
Is preferred. According to this configuration, an uneven surface of the display device substrate is provided with the display device substrate,
For example, by being arranged on the surface of a tablet or the like stacked on the display device, it is possible to prevent flicker due to the reflected light of the display device and to improve the writing quality of pen input.

Further, according to the present invention, at least one of the pair of ultra-thin glass plates of the display device substrate, which is to be the outer surface of the substrate, is subjected to an anti-reflection treatment. Is preferred. According to this configuration, since the antireflection processing surface is disposed so as to be on the display surface side of the display device including the display device substrate, it is possible to prevent the display surface from flickering due to reflected light. .

Further, according to the present invention, the plate-like body layer of the display device substrate preferably includes an optical member . In this configuration
According to this, the display quality of the display device provided with the display device substrate can be improved by the optical member.

According to the invention, it is preferable that the optical member of the display device substrate is a polarizing plate . This configuration
According to this, the display device substrate can be suitably used for a display device such as a liquid crystal display device using a polarizing plate.

According to the invention, the optical member of the display device substrate is preferably a retardation plate . This structure
According to this, the display device substrate can be suitably used for a display device such as a liquid crystal display device using a retardation plate.

According to the invention, it is preferable that the optical member of the display device substrate is a reflection plate . This configuration
According to this, the display device substrate can be suitably used for a display device using a reflection plate.

According to the present invention, it is preferable that the optical member of the display device substrate is a transflective plate . This
According to the configuration, the display device substrate can be suitably used for a display device using a transflective reflector.

Further, according to the present invention, it is preferable that the optical member of the display device substrate is a plurality of retardation plates .
According to this configuration, the display device substrate can be suitably used for a display device using a plurality of retardation plates.

According to the present invention, it is preferable that the optical member of the display device substrate is a twisted phase plate . This
According to the configuration, the display device substrate can be suitably used for a display device using a twisted phase difference plate.

[0035]

FIG. 1 is a sectional view showing the structure of a display device substrate 21 according to an embodiment of the present invention. As shown in FIG.
The substrate 21 includes a pair of ultra-thin glass sheets 22 and 22a,
A polyvinyl butyral-based transparent adhesive resin layer 23 thicker than the ultra-thin glass plates 22 and 22a, and the ultra-thin glass plates 22 and 22a are formed on both surfaces of the transparent adhesive resin layer 23.
Are laminated.

The substrate 21 is prepared according to the following procedure. A 5 mm-thick soda-lime glass plate is used as a support, on which members each having a size of 30 cm × 30 cm described below are laminated. First, a 0.05 mm thick low alkali glass microsheet 22 is laminated.
A 0.38 mm thick polyvinyl butyral film 23 having an adhesive property, washed with water, dried, cut, and conditioned is laminated thereon. Furthermore, a borosilicate glass plate 22a having a thickness of 0.05 mm, one surface of which is polished by an Oscar-type polishing machine.
Are stacked with the polished surface up.

The substrate 21 thus laminated on the support is housed in a rubber bag and heated under reduced pressure at a temperature of 90 ° C. and a degree of vacuum of 600 mmHg for 30 minutes to perform preliminary bonding. Next, UV (ultraviolet) is applied to the end face of the substrate 21.
A curable acrylic resin is applied, and the acrylic resin is cured by ultraviolet irradiation. Thereby, the substrate 2
1 is sealed. Further, the substrate 21 is pressurized in an autoclave at 140 ° C. and 15 kg / cm ² for 30 minutes, and at the same time, the UV curable acrylic resin applied to the end surface of the substrate 21 is sufficiently cured.

In this example, a microsheet 22 manufactured by Corning Co., Ltd. was used as the microsheet 22 made of low alkali glass, and an Eslec film series manufactured by Sekisui Chemical Co., Ltd. was used as the polyvinyl butyral film 23.

FIG. 2 is a sectional view showing the structure of a monochrome display reflective phase difference plate STN liquid crystal cell 28 using the substrate 21 shown in FIG. As shown in FIG. 1, the liquid crystal cell 28 is formed by enclosing a liquid crystal layer 26 between the pair of substrates 21 via a spacer (not shown). The pair of substrates 2
In No. 1, a transparent electrode made of an ITO (indium tin oxide) film and the like and an alignment film 25 are formed on a polished surface, and are arranged so that the surfaces face each other. A polarizing plate 24 with a retardation plate is provided on one outer substrate surface of the liquid crystal cell 28, and a polarizing plate 27 with a reflector is provided on the other outer substrate surface.

The liquid crystal cell 28 is formed by using a manufacturing process of a color display STN liquid crystal cell using a lath substrate. In the manufacturing process of a color display STN liquid crystal cell, since a liquid crystal cell to be manufactured is provided with a color filter and the like, the process is performed at a lower temperature than the manufacturing process of a monochrome display STN liquid crystal cell using a normal glass substrate. The liquid crystal cell 28 thus formed is further modularized by a normal liquid crystal module forming process similar to the case where a glass substrate is used, and has a resolution of 640 × 48.
A black-and-white display reflective phase difference plate STN liquid crystal module having 0 dots and 0.18 mm dot pitch is produced.

In the liquid crystal module prepared as described above, no bubbles were observed in the liquid crystal layer 26 as a result of aging at a temperature of 60 ° C. and a humidity of 95% for 100 hours. Also, there was no disconnection of the transparent electrode. Further, in the liquid crystal module, it was possible to realize the same thin and light weight as the liquid crystal module using the conventional plastic substrate, and at the same time, it was possible to obtain the same uniform display as the liquid crystal module using the glass substrate. .

FIG. 3 is a sectional view showing the structure of a display device substrate 30 according to another embodiment of the present invention. As shown in FIG. 3, the display device substrate 30 has a pair of ultra-thin glass plates 22 and 22a bonded to both surfaces of a plate-like body layer having a transparent adhesive resin layer 23 provided on both surfaces of a transparent resin layer 29. The thickness of the plate-like body layer is designed to be larger than the thickness of the ultra-thin glass plate 22.

The substrate 30 is prepared according to the following procedure. A 5 mm-thick non-alkali glass plate is used as a support, on which members each having a size of 30 cm × 30 cm described below are laminated. First, a sol-gel non-alkali glass plate 22 having a thickness of 0.01 mm is laminated, and a modified polyolefin-based film 2 having a thickness of 0.15 mm is further formed.
3, a polyarylate film 29 having a thickness of 0.1 mm, and the modified polyolefin film 23 having a thickness of 0.15 mm
A sol-gel method non-alkali glass plate 22 having a thickness of 0.01 mm is laminated in this order.

These are stored in a rubber bag,
0 ° C., vacuum heating at 600 mmHg for 30 minutes,
The preliminary bonding of the substrate 30 is performed. Next, the substrate 30
Is coated with a UV curable acrylic resin. Further, the acrylic resin is cured by ultraviolet irradiation, and the end face of the substrate 30 is sealed. Further, the substrate 30
Pressure is applied at 120 ° C. and 10 kg / cm ² for 30 minutes in an autoclave, and at the same time, the UV-curable acrylic resin applied to the end face of the substrate 30 is sufficiently cured.

In this embodiment, the modified polyolefin-based film 23 is a Dumilan series manufactured by Takeda Pharmaceutical Company Limited, and the polyarylate film 29 is used.
The U series manufactured by Unitika Ltd. was used.

FIG. 4 is a sectional view showing another embodiment.
As shown in FIG. 4, the substrate 30a is the same as the substrate 30 shown in FIG.
However, one surface of the substrate 30a is provided with irregularities.

The substrate 30a is composed of a non-alkali glass plate 22 having a thickness of 0.1 mm, a non-alkali glass plate 22 having a thickness of 0.1 mm, a modified polyolefin-based film 23 having a thickness of 0.15 mm, and a thickness of 0.1 mm. A 1 mm polyarylate film 29, the 0.15 mm thick polyolefin-based film 23, and a 0.1 mm thick non-alkali glass plate 22 a having irregularities on one surface by chemical etching are laminated in this order. However, the substrate 30
The size of each component a is 30 cm x 30 cm
It is. The pre-adhesion, sealing of the end face, and pressurization by an autoclave are performed in the same manner as the substrate 30 shown in FIG.

In this embodiment, the modified polyolefin-based film 23 is a Dumilan series manufactured by Takeda Pharmaceutical Company Limited, and the polyarylate film 29 is used.
The U series manufactured by Unitika Ltd. was used.

FIG. 5 is a sectional view showing the structure of a reflection type color display guest host TFT (thin film transistor) liquid crystal cell 40 using the substrate 30a shown in FIG. As shown in FIG. 5, the liquid crystal cell 40 includes the substrate 30 and the substrate 30a.
PC (phase transition) GH (guest host) liquid crystal layer 3
6 are formed. On the liquid crystal layer 36 side surface of the substrate 30, a TFT for selectively driving each pixel is formed. In the TFT, a gate terminal 33 made of a-Si (amorphous silicon) is connected to, for example, a scanning signal line (not shown), a source terminal 31 is connected to a data signal line (not shown), and a drain terminal 32 is connected to a pixel electrode 35 made of Al. When the TFT is turned on by the scanning signal, a data signal is applied to the pixel electrode 35 to drive the pixel. Further, a protective film 34 made of an acrylic resin is formed on the TFT, and the pixel electrode 35 is formed on the protective film 34.
Is formed. The pixel electrode 35 is connected to the drain terminal 32 of the TFT via a contact hole formed in the protective film 34. An alignment film or the like (not shown) is formed on the pixel electrode 35 and an alignment process is performed.

A color filter 38 of blue, red, green, or the like is provided on the surface of the substrate 30a on which the unevenness is not provided.
And a light-shielding film, etc., on which an ITO film 37 and an alignment film (not shown) are formed. The alignment film is subjected to an alignment process.

In the liquid crystal cell 40, the substrate 30 and the substrate 30a are bonded so that the surfaces on which the alignment films are formed face each other, and the PCGH liquid crystal layer 36 is sealed via a spacer (not shown). It is formed. The liquid crystal cell 40 is produced by the conventional manufacturing process for a reflective color display guest host TFT liquid crystal cell using a glass substrate as described above. The liquid crystal cell manufacturing process is called "SID '
92, Session 23, 23.6 report. Further, the liquid crystal cell 40 is modularized by a conventional modularization process, and a liquid crystal module is created.

As a result, a thin and lightweight guest-host TFT liquid crystal module for reflection type color display was obtained as compared with a conventional liquid crystal module using a glass substrate. Furthermore, since the surface of the substrate 30a is subjected to the unevenness processing, reflection from the display surface can be prevented, visibility can be improved, and writing quality when performing pen input can be improved.

FIG. 6 is a sectional view showing still another embodiment. As shown in FIG. 6, the substrate 30b has an antireflection film 41 formed on one surface of the substrate 30 shown in FIG. That is, the display device substrate 30b is, as shown in FIG.
A transparent adhesive resin layer 23 made of a modified polyolefin-based film having a thickness of 0.15 mm is provided on both surfaces of a polyarylate film 29 having a thickness of 0.1 mm to form a plate-like body layer, and a pair of thicknesses 0 is formed on both surfaces thereof. An ultra-thin glass 22 made of non-alkali glass of 0.05 mm is bonded, and an anti-reflection film 41 is formed on the outer surface of one of the pair of ultra-thin glass 22.

The pre-adhesion of the substrate 30b, sealing of the end face, and pressurization by an autoclave are performed by the same processing as the above-described substrate 30.

FIG. 7 is a sectional view showing the structure of a display device substrate 45 according to another embodiment of the present invention. As shown in FIG. 7, a substrate 45 is provided with a transparent adhesive resin layer 23 on both surfaces of a polarizing plate 44 having a transparent film provided on both surfaces as a protective layer to form a plate-like body layer. Are laminated and bonded.

The substrate 45 is prepared according to the following procedure. Using a non-alkali glass plate having a thickness of 5 mm as a support, members each having a size of 30 cm × 30 cm described below are laminated. First, a 0.05 mm-thick alkali-free glass plate 22 having one surface polished by an Oscar-type polisher is laminated on the support with the polished surface down. On this, a modified polyolefin-based film 2 having a thickness of 0.15 mm 2
3 are further laminated, and a dichroic dye is adsorbed on a stretched PVA (polyvinyl alcohol) film.
A polarizing plate 44 having a PES (polyethersulfone) film having a thickness of 0.1 mm is laminated on both sides of the A film.
Further, the modified polyolefin-based film 23 having a thickness of 0.15 mm is laminated thereon, and the alkali-free glass plate 22 having a thickness of 0.05 mm is laminated thereon with the polished surface facing upward.

The substrate 45 thus laminated on the support is housed in a rubber bag and has a temperature of 90.degree.
The pre-adhesion is performed by heating under reduced pressure at 00 mmHg for 30 minutes. Next, a UV curable acrylic resin is applied to the end surface of the substrate 45, and the acrylic resin is cured by ultraviolet irradiation. Thereby, the end face of the substrate 45 is sealed. Further, the substrate 45 is placed in an autoclave for 1 hour.
Pressure is applied at 40 ° C. and 15 kg / cm ² for 30 minutes, and at the same time, the UV curable acrylic resin applied to the end face of the substrate 45 is sufficiently cured.

In this embodiment, the transparent film provided as a protective layer on the polarizing film is, in addition to the PES film,
Other transparent films such as PES-based, polyarylate-based, polycarbonate-based, epoxybutadiene copolymer-based, norbornene-based, and polyester-based films may be used.
In this case, the transparent film desirably has high heat resistance and low birefringence.

As described above, the display device substrate 45 of this embodiment is used.
Has a polarizing plate 44, so that a TF that requires a polarizing plate
T liquid crystal display, MIM liquid crystal display, STN liquid crystal display, SH liquid crystal display, TN liquid crystal display, S
It can be suitably used for liquid crystal devices such as SFLC (surface stable ferroelectric liquid crystal) and antiferroelectric liquid crystal display device.

FIG. 8 is a sectional view showing the structure of a display device substrate 48 according to another embodiment of the present invention. As shown in FIG. 8, the substrate 48 is formed by laminating an ultra-thin glass 22, a transparent resin layer 23, a retardation plate 46, a polarizing plate 47, a transparent resin layer 23, and an ultra-thin glass 22 in this order. .

The substrate 48 is prepared according to the following procedure. Using a soda lime glass plate having a thickness of 5 mm as a support, 30 cm ×
A member having a size of 30 cm is laminated. First, a thickness of 0.
A 005 mm sol-gel method non-alkali glass plate 22 is laminated with the polished surface facing down, and further washed with water, dried, cut,
The conditioned polyvinyl butyral film 23 having a thickness of 0.38 mm is laminated thereon. This has a phase difference of 430n
m, a polarizing plate 47 provided with a 0.1 mm thick polycarbonate film having no retardation on both sides as a protective layer, and a 0.38 m thick
m, polyvinyl butyral film 23, thickness 0.00
A 5 mm sol-gel non-alkali glass plate 22 is laminated in this order with the polished surface facing up.

The substrate 4 laminated on the support as described above
8 is subjected to pre-adhesion, sealing of the end face, and pressurization by an autoclave in the same manner as the substrate 45 shown in FIG.

In this embodiment, the retardation plate 46 is a polycarbonate retardation plate.
Other retardation plates such as polyester, acrylic, PVA, and polystyrene may be used.

As described above, the display device substrate 48 of the present embodiment is used.
Can be used for liquid crystal cells such as STN-based liquid crystal display devices, SH-based liquid crystal display devices, SSFLC, and TFT liquid crystal display devices that require a retardation plate for at least color compensation, wide viewing angle, and １ ／ λ. .

FIG. 9 is a sectional view showing the structure of a display device substrate 48a according to still another embodiment of the present invention. FIG.
As shown in the figure, a substrate 48a is formed by laminating an ultra-thin glass 22, a transparent resin layer 23, a retardation plate 46, a transparent resin layer 23a, a polarizing plate 47, a transparent resin layer 23, and an ultra-thin glass 22 in this order. Is done.

The substrate 48a is prepared according to the following procedure. Using a soda-lime glass plate having a thickness of 5 mm as a support, 30 cm ×
A member having a size of 30 cm is laminated. First, a thickness of 0.
A soda lime glass plate 22 having one surface polished to a thickness of 05 mm is laminated with the polished surface down, and a modified polyolefin-based film 23 having a thickness of 0.15 mm is further laminated. Further, a polycarbonate-based retardation plate 46 having a retardation of 430 nm, which is preliminarily bonded via an acrylic adhesive 23a, and a polarizing plate 47 having a 0.1 mm-thick polycarbonate film having no retardation on both surfaces as a protective layer. Are laminated. However, the polarizing plate 47 and the retardation plate 46 are arranged such that the absorption axis of the polarizing plate forms an intersection angle of 30 ° with the stretching axis of the retardation plate. Further, on the polarizing plate 47, a modified polyolefin-based film 23 having a thickness of 0.15 mm and a soda lime glass plate 22 having a thickness of 0.05 mm and having one surface polished are laminated in this order with the polished surface facing up. Is done.

The substrate 48a laminated on the support as described above is similar to the substrate 45 shown in FIG.
Pre-adhesion, sealing of the end face and pressurization by an autoclave are performed.

Also in this embodiment, other retardation plates and polarizing plates may be used for the retardation plate 46 and the polarizing plate 47. Further, the absorption axis of the polarizing plate 47 and the stretching axis of the retardation plate 46 may be arranged at different intersection angles.

As described above, the display device substrate 48 of the present embodiment is used.
a denotes an STN-based liquid crystal display device, an SH-based liquid crystal display device, a SSFLC, and a TF, which simultaneously require a retardation plate and a polarizing plate.
It can be used for a T liquid crystal display device and the like.

FIG. 10 is a sectional view showing the structure of a display device substrate 51 according to another embodiment of the present invention. As shown in FIG. 10, the substrate 51 is made of an ultra-thin glass 22, a transparent resin layer 23, a twisted retardation film 50, and an ultra-thin glass 22.
Are laminated and formed in this order.

The substrate 51 is prepared according to the following procedure. Using a borosilicate glass plate having a thickness of 5 mm as a support, 30 cm × 3
A member having a size of 0 cm is stacked. First, the thickness 0.2
A borosilicate glass plate 22 having one surface polished on one side is laminated with the polished surface down, and a thickness of 0.38 m
m modified polyolefin-based films 23 are laminated.
On top of this, a thickness of about 2 published in
A 0.2 mm thick borosilicate glass plate 22 having a 0 μm twisted retardation film 50 formed on one surface is laminated with the twisted retardation film 50 down. Also,
The other surface of the borosilicate glass plate 22 is polished.

The substrate 5 laminated on the support as described above
In the step 1, in the same manner as in the case of the substrate 45 shown in FIG.

In this embodiment, the torsional retardation film 50 is made of a main chain polymer such as an optically active polycarbonate, a side chain type polymer such as an optically active polyacrylate, or a main chain type polymer such as a polyester amide that is not optically active. A retardation film 50 using another material such as a polymer obtained by adding another optically active compound to a polymer, or a polymer obtained by adding another optically active compound to a side chain type polymer such as polymethacrylate which is not optically active may be used. .

As described above, the display device substrate 51 of this embodiment is
Can be used for a liquid crystal display device such as an STN liquid crystal display device because the liquid crystal display device has a twisted retardation film 50.
The same effect as that of the optical compensation cell of the STN (Double STN) liquid crystal display device can be obtained.

FIG. 11 is a sectional view showing the structure of a display device substrate 52 according to another embodiment of the present invention. The substrate 5
2 is an ultra-thin glass 22, a transparent resin layer 23, a retardation plate 4
6, transparent resin layer 23a, retardation plate 46, transparent resin layer 23
And the ultra-thin glass 22 are laminated and formed in this order.

The substrate 52 is prepared according to the following procedure. A soda lime glass plate having a thickness of 5 mm was used as a support, and 30 cm × 3 each described below on the support.
A member having a size of 0 cm is laminated. First, thickness 0.05
mm soda lime glass plate 22 with one surface polished
Are stacked with the polished surface down, and a thickness of 0.15
mm modified polyolefin-based film 23 is laminated. Further, two polycarbonate phase difference films 46 having a phase difference of 430 nm and a thickness of 0.5 mm, which are preliminarily bonded via the acrylic adhesive 23a, are laminated. The retardation films 46 are arranged such that the stretching axes form a cross angle of 40 ° with each other. Further, the retardation film 46
A modified polyolefin film 23 having a thickness of 0.15 mm and a soda lime glass plate 22 having a thickness of 0.05 mm and having one surface polished are laminated in this order on the polished surface.

The substrate 5 laminated on the support as described above
2, the pre-adhesion, sealing of the end face, and pressurization by an autoclave are performed in the same manner as the substrate 45 shown in FIG.

The display device substrate 52 of this embodiment uses a retardation film made of another material in addition to the retardation plate used in this embodiment as the retardation plate 46, similarly to the substrate 48 shown in FIG. Alternatively, those having different retardations, the number of retardation plates, the direction of the stretching axis, and the like may be used. Further, the plurality of retardation plates 46 may be combined with the same type of retardation film, or may be combined with different types of retardation films. May be arranged differently.

As described above, the display device substrate 52 of this embodiment is
Is provided with a plurality of phase difference plates, so that it can be used for a wide viewing angle, high resolution phase difference plate STN liquid crystal display device and a high contrast reflection type phase difference plate STN liquid crystal display device.

FIG. 12 is a sectional view showing the structure of a display device substrate 55 according to another embodiment of the present invention. The substrate 5
5 is an ultra-thin glass 22 and a resin layer 23, a transparent film 54, a reflective layer 53, and a transparent resin layer 2 as shown in FIG.
3. Polarizing plate 47, transparent resin layer 23 and ultrathin glass 2
2 are laminated and formed in this order.

The substrate 55 is prepared according to the following procedure. Using a non-alkali glass plate having a thickness of 5 mm as a support, 30 cm × 3
A member having a size of 0 cm is stacked. First, the thickness 0.0
Alkali-free glass plate 22 whose one surface is polished 5 mm
Are stacked with the polished surface down, and a thickness of 0.15
mm modified polyolefin-based film 23 is laminated. On this, a PES film 54 and a reflective layer 53 made of an Al vapor-deposited film are laminated in this order. The reflection layer 53
Is formed on the PES film 54 in advance, and the total thickness of the reflection layer 53 and the PES film 54 is about 0.1 m.
m. Further, a modified polyolefin-based film 23 having a thickness of 0.15 mm is laminated on the reflection layer 53. It has a thickness of 0. 0 on both sides as a protective layer.
A polarizing plate 47 provided with a 1 mm PES film is laminated. As the polarizing plate 47, one obtained by adsorbing iodine on stretched PVA is used. Further, a modified polyolefin-based film 23 having a thickness of 0.15 mm and a thickness of 0.05 mm
An alkali-free glass plate 22 having one surface polished is laminated in this order with the polished surface facing upward. The substrate 55 laminated on the support as described above is subjected to preliminary bonding, sealing of the end face, and pressurization by an autoclave in the same manner as the substrate 45 shown in FIG. 7 described above.

As described above, the display device substrate 55 of this embodiment is
Is provided with a vapor deposited Al reflective layer 54, so that it can be used for reflective liquid crystal display devices such as STN liquid crystal display devices, SH liquid crystal display devices, SSFLC, and TFT liquid crystal display devices.

FIG. 13 is a sectional view showing the structure of a display device substrate 57 according to another embodiment of the present invention. As shown in FIG. 13, on the substrate 57, the ultra-thin glass 22, the transparent resin layer 23, the transparent film 53, the transflective layer 56, the polarizing plate 47, the transparent resin layer 23 and the ultra-thin glass 22 are laminated in this order. Is done.

The substrate 55 is prepared in the following order. Using a 5 mm-thick non-alkali glass plate as a support,
30 cm × 30 c each described below on the support
Members having a size of m are stacked. First, thickness 0.05m
An alkali-free glass plate 22 having one surface polished is laminated with the polished surface down. 0.15m thick
m modified polyolefin-based films 23 are laminated.
On top of this, a polycarbonate film 53 and a polarizing plate 47
Are adhered in advance through a transflective layer 56 in which a pearl pigment having a thickness of 0.1 mm and an acrylic adhesive are mixed, and are laminated with the polycarbonate film 53 facing down. The polarizing plate 47 is made by adsorbing iodine on a stretched PVA film, and has a thickness of 0.1 m on both sides as a protective film.
m polycarbonate film is provided. further,
On the polarizing plate 47, a modified polyolefin-based film 23 having a thickness of 0.15 mm and a soda lime glass plate 22 having a thickness of 0.05 mm and having one surface polished are laminated in this order with the polished surface facing up. You.

The substrate laminated on the support as described above is subjected to pre-adhesion, sealing of the end face and pressurization by an autoclave in the same manner as the substrate 45 shown in FIG.

In this embodiment, the transflective layer 56
For the polarizing plate 47, even if a transflective layer and a polarizing plate other than those used in the examples are used, such as a method of forming a transflective layer, a material of a base film of the transflective layer, and a material of the polarizing plate. Good.

Since the display device substrate 57 of this embodiment includes the transflective layer 56 and the polarizing plate 47, the STN
Liquid crystal display, SH liquid crystal display, SSFLC, T
It can be used for a transflective liquid crystal display device such as an FT liquid crystal display device.

The substrates 21, 30, 45, 4 of the present invention
The material of the pair of ultra-thin glass plates 22 used for 8, 51, 52, 55, and 57 is borosilicate glass, soda lime glass, non-alkali glass, sol-gel glass, or the like.
Glasses other than those used in this embodiment may be used, and combinations other than those used in this embodiment may be used.

The ultra-thin glass 22 may be formed by any method such as a redraw method, a fusion method, a microsheet method, and a sol-gel method. The thickness of the ultra-thin glass 22 is 0.0015 mm. 0.2 or more
Less than 5 mm is preferred.

Further, the pair of ultra-thin glass sheets 22 may or may not be polished on the surface, and the pair of ultra-thin glass sheets 22 are not necessarily subjected to the same surface processing. Is also good.

The substrates 21, 30, 45, 4 of the present invention
The transparent adhesive resin layer 23 used for 8, 51, 52, 55, 57 is made of polyvinyl butyral resin, modified polyolefin resin, polyurethane resin, UV curable acrylic resin, acrylic adhesive, urethane adhesive, or the like. A transparent adhesive resin other than that used in this example may be used, and the curing method thereof is an autoclave method,
The composition may be cured by a method other than the method used in this embodiment, such as a vacuum depressurization method or ultraviolet irradiation.

Further, the substrates 21, 30, 45, 4 of the present invention
Transparent resin layer 2 used for 8, 51, 52, 55, 57
9 is a polyarylate, polyether sulfone (P
Transparent resins other than those used in this example, such as amorphous plastics such as ES), polycarbonate, norbornene, and polysulfone, and crystalline plastics such as polyester may be used. However, it is desirable that the transparent resin layer 29 has high heat resistance. The transparent resin layer 29 has a thickness of 0.1 mm, 0.2 mm,
Thicknesses other than those used in this embodiment, such as 0.3 mm, may be used.

The substrates 21, 30, 45, 4 of the present invention
The surface treatment applied to 8, 51, 52, 55, 57 may be a treatment other than that applied in the present embodiment, such as polishing, formation of irregularities, formation of an antireflection film, or the like.
1, 30, 45, 48, 51, 52, 55, and 57 may be applied to one side or both sides. Further, different surface treatments may be applied to one surface and the other surface of the substrate. The surface treatment is performed on the substrates 21, 30, 45, 48, 5
It may be applied after the formation of 1, 52, 55, 57 or may be applied in the state of ultra-thin glass 22.

Further, the substrates 21, 30, 45, 4 of the present invention
Reference numerals 8, 51, 52, 55, and 57 denote display types such as a reflective type, a transflective type, and a transmissive type other than the liquid crystal display device described in this embodiment, an STN type liquid crystal display device, a TN type liquid crystal display device, and an SH type. Liquid crystal display, TFT liquid crystal display, MFM
Liquid crystal display device, SSFLC, antiferroelectric liquid crystal display device,
The present invention may be applied to a liquid crystal display device having a different display method such as a polymer dispersed liquid crystal display device. In addition, the substrates 21, 3
0, 45, 48, 51, 52, 55, and 57 may be used in a liquid crystal cell as an optical compensator on which electrodes such as an ITO film are not formed. Further, the substrates 21 and 30 may be used for a display device such as a thin film EL device, a touch panel, and the like, in addition to the liquid crystal display device.

Further, the substrates 45, 48, 5 of the present invention
Optical members provided in 1, 52, 55, and 57 include one or more polarizing plates, retardation plates, reflectors, transflectors, and one or more UV absorption filters other than those used in this embodiment. , A wavelength conversion filter, a color filter, a microlens, and the like may be used alone or in combination.

The substrates 45, 48, 51, 5 of the present invention
The retardation plates provided in 2, 55, and 57 include, in addition to those used in this embodiment, polycarbonate, polyester, acrylic, PVA, polystyrene, and the like.
Other retardation films may be used, and any of a uniaxially stretched retardation plate and a twisted retardation plate may be used.
Further, other than those used in the present embodiment, such as the direction of the stretching axis, the phase difference, the thickness, and the arrangement with other optical members combined therewith, may be used.

Similarly, the substrates 45, 48, 5
The polarizing plates 47 provided in 1, 52, 55, and 57 include, in addition to those used in this embodiment, types of polarizing plates such as dye-based and iodine-based, color tone of the polarizing plate, direction of the polarizing axis, polarizing plate film. Other polarizing plates having different materials may be used.
Further, polarizing plates having different types of transparent films provided as a protective layer of the polarizing plate, such as PES-based, polyarylate-based, polycarbonate-based, epoxybutadiene-based copolymer, norbornene-based, and polyester-based, may be used.

Further, the substrates 45, 48, 5 of the present invention
The reflectors provided in 1, 52, 55, and 57 are different from those used in the present embodiment in that the type of the reflector, the material of the reflective film such as Al and Ag, the material of the base film, and the surface shape thereof are different. Different reflectors may be used.

As described above, the display device substrate of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the spirit of the present invention.

[0100]

As described above, according to the present invention, a substrate for a display device comprises a pair of ultra-thin light-transmitting plates on both surfaces of a plate-like layer including at least one adhesive light-transmitting resin layer. Glass plates are laminated. In particular, since glass has a large specific gravity, by setting the thickness of the ultra-thin glass plate to be less than 0.25 mm, a display device substrate thinner and lighter than a conventional glass substrate can be produced. Further, since the display device substrate is provided with an ultra-thin glass plate on both surfaces, the substrate surface is less likely to be damaged than a plastic substrate, and at the same time, it is possible to prevent air from passing through the substrate. Therefore, generation of bubbles in the liquid crystal layer sealed between the substrates can be prevented. Further, since the display device substrate is provided with ultra-thin glass plates on both sides, it is excellent in heat resistance and chemical resistance. Therefore, the display device can be manufactured by a manufacturing process for a display device using a glass substrate, and the manufacturing cost can be reduced. At the same time, the thermal expansion of the substrate can be suppressed to a low level, so that it is possible to prevent cracks and disconnections from occurring in the electrodes made of the ITO film or the like formed on the substrate in a display device manufacturing process such as heat treatment. it can.

Further, since the strength of the substrate can be improved by providing the ultra-thin glass plates on both surfaces of the substrate, the cell thickness of the liquid crystal cell sealed between the substrates can be kept uniform. Therefore, display unevenness such as uneven color tone caused by uneven cell thickness of the liquid crystal cell can be prevented, and display quality of the display device can be improved. Also, since the surface of the display device substrate is made of glass,
When an antireflection film or the like is formed on a substrate, the adhesion between the substrate and the film is excellent.

[0102] According to the invention, a pair of ultra-thin glass plate provided on both surfaces of the substrate for a display device, the polishing is performed on the outer surface of at least one ultrathin glass plate
Is preferred. According to this configuration, by disposing the pair of display device substrates so that the polished surfaces face each other and sealing the liquid crystal, the cell thickness of the liquid crystal cell can be made uniform, and the liquid crystal without display unevenness can be obtained. A display device can be formed.

Further, according to the present invention, at least one of the pair of ultra-thin glass plates of the display device substrate has an irregular surface on the surface which is the outer surface of the substrate. Is preferred. According to this configuration, since the uneven surface of the display device substrate is disposed on a surface of a device including the display device substrate, for example, a tablet laminated on the display device, the reflected light of the display device is provided. Can be prevented, and the writing quality of pen input can be improved.

Further, according to the present invention, of the pair of ultra-thin glass plates of the display device substrate, at least one of the ultra-thin glass plates which is to be the outer surface of the substrate is subjected to an anti-reflection treatment. Is preferred. According to this configuration, since the antireflection processing surface is arranged so as to be on the display surface side of the display device provided with the display device substrate, it is possible to prevent the display surface from flickering due to reflected light. .

Further, according to the present invention, it is preferable that the plate-like layer of the display device substrate includes an optical member . In this configuration
According to this, the display quality of the display device provided with the display device substrate can be improved by the optical member.

Further, according to the present invention, it is preferable that the optical member of the display device substrate is a polarizing plate . This configuration
According to this, the display device substrate can be suitably used for a display device such as a liquid crystal display device using a polarizing plate.

According to the invention, it is preferable that the optical member of the display device substrate is a retardation plate . This structure
According to this, the display device substrate can be suitably used for a display device such as a liquid crystal display device using a retardation plate.

Further, according to the present invention, it is preferable that the optical member of the display device substrate is a reflection plate . This configuration
According to this, the display device substrate can be suitably used for a display device using a reflection plate.

Further, according to the present invention, it is preferable that the optical member of the display device substrate is a transflective plate . This
According to the configuration, the display device substrate can be suitably used for a display device using a transflective reflector.

Further, according to the present invention, it is preferable that the optical member of the display device substrate is a plurality of retardation plates .
According to this configuration, the display device substrate can be suitably used for a display device using a plurality of retardation plates.

Further, according to the present invention, it is preferable that the optical member of the display device substrate is a twisted phase difference plate . This
According to the configuration, the display device substrate can be suitably used for a display device using a twisted phase difference plate.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of a display device substrate 21 according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a black-and-white display reflective phase difference plate STN liquid crystal cell using the substrate 21 shown in FIG.

FIG. 3 shows a display device substrate 30 according to another embodiment of the present invention.
It is sectional drawing which shows a structure of.

FIG. 4 shows a display device substrate 30 according to another embodiment of the present invention.
It is sectional drawing which shows a.

5 is a cross-sectional view showing a configuration of a reflective color display guest host TFT liquid crystal cell 40 using the substrate 30a shown in FIG.

FIG. 6 shows a display device substrate 30 according to another embodiment of the present invention.
It is sectional drawing which shows b.

FIG. 7 shows a display device substrate 45 according to another embodiment of the present invention.
It is sectional drawing which shows a structure of.

FIG. 8 shows a display device substrate 48 according to another embodiment of the present invention.
It is sectional drawing which shows a structure of.

FIG. 9 is a cross-sectional view showing a configuration of a display device substrate 48a according to still another embodiment of the present invention.

FIG. 10 is a sectional view showing a configuration of a display device substrate 51 according to still another embodiment of the present invention.

FIG. 11 is a sectional view showing a configuration of a display device substrate 52 according to still another embodiment of the present invention.

FIG. 12 is a cross-sectional view showing a configuration of a display device substrate 55 according to still another embodiment of the present invention.

FIG. 13 is a cross-sectional view showing a configuration of a display device substrate 57 according to still another embodiment of the present invention.

FIG. 14 is a cross-sectional view showing a configuration of a display device substrate 5 which is a conventional example.

FIG. 15 is a cross-sectional view showing a configuration of a polarizing plate integrated substrate 16 which is a conventional example.

[Explanation of symbols]

21, 30, 30a, 30b, 45, 48, 48a, 5
1, 52, 55, 57 Display Device Substrate 22 Ultra-Thin Glass 23 Transparent Adhesive Resin Layer 29 Transparent Resin Layer 44, 47 Polarizing Plate 46 Retardation Plate 50 Twisted Retardation Plate 53 Reflective Layer 56 Transflective Reflective Layer

Claims (1)

(57) [Claims] 1. A light-transmitting layer having a thickness of 0.00 on both surfaces of a plate-like body layer including at least one adhesive light-transmitting resin layer.
Ri Na pair of ultra-thin glass plate is less than 0.25mm or 15mm are stacked, the plate-like body layer the ultra-thin glass sheet
A display device substrate having a thickness of at least one sheet .