JP2001133761A - Liquid crystal display device and organic LED device - Google Patents

Abstract

An object of the present invention is to provide a liquid crystal display element and an organic LED element which can reduce deformation of a plastic substrate due to thermal deformation and moisture absorption, have high image quality, and can be reduced in weight. And SOLUTION: The present invention relates to a liquid crystal display device or an organic liquid crystal display device.
As the substrate 10 of the ED element, a linear or band-like fiber 12 is embedded in a plastic layer 11 separated from each other, and an electrode 13 is formed on one surface of the plastic layer 11, or internally. It is characterized in that carbon fibers 12 are embedded in a plastic layer 11 and that an electrode 13 is formed on one surface of the plastic layer 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a liquid crystal display device and an organic LED device.

[0002]

2. Description of the Related Art In recent years, with the development of satellite communication and mobile communication technology, the demand for small portable information terminal equipment is increasing.
Display devices mounted on many portable information terminal devices are required to be thin, and liquid crystal display elements are most frequently used. In particular, the use of a TFT drive panel that can be made thin and light and can obtain a clear image is becoming mainstream.

[0003] When this type of liquid crystal display device is used in a portable information terminal device, the weight can be reduced by using plastic for the substrate. However, a plastic substrate has a large thermal expansion coefficient and is deformed by heat, and is deformed by moisture absorption. Therefore, it is difficult to align a mask for forming a TFT array. It has been difficult to obtain a liquid crystal display element with high accuracy.

On the other hand, JP-A-11-2812 discloses that
A plastic substrate for a reflective liquid crystal display element comprising a laminated layer including a fiber cloth impregnated and cured with a resin is disclosed.In particular, the fiber cloth is made of glass or a filament such as a resin made of an aromatic polyamide. Is described. Further, it is described that the substrate is excellent in water vapor barrier property, heat resistance, rigidity and the like.

However, when a laminated layer including a fiber cloth impregnated with a resin as described above is used as a substrate of a liquid crystal display element, minute irregularities due to the weave and overlapping of the fibers of the fiber cloth are formed on the substrate surface. This causes deterioration of image quality.

Further, even when a laminated layer including a fiber cloth made of fibers such as glass or resin as described above is used as a substrate of a liquid crystal display element, fibers made of such materials have a small effect of suppressing deformation of the substrate. Mask alignment is more difficult than in the case where a glass substrate is used, and it is still difficult to obtain a liquid crystal display element with high accuracy.

Further, the publication describes that a plastic substrate composed of a laminated layer containing a fiber cloth impregnated with a resin and cured as described above can be applied to a display element (EL element) using electroluminescence. Have been.

However, when a laminated layer including a fiber cloth impregnated with a pre-resin is applied to an EL element as a substrate,
As in the case of the liquid crystal display element, fine irregularities due to the weave of the fiber cloth are generated on the substrate surface, which causes deterioration of image quality.

In addition, the effect of suppressing deformation of the substrate is small,
Mask alignment is more difficult than in the case where a glass substrate is used, and it is difficult to obtain an EL element or a liquid crystal display element with high accuracy.

[0010]

As described in detail above,
A conventional liquid crystal display device using a plastic substrate has a problem that the substrate is easily deformed by heat or moisture absorption, and it is difficult to align a mask when forming a TFT array or the like.

There is another problem that it is difficult to obtain a liquid crystal display device having high image quality.

Similarly, in the organic LED element,
When a conventional plastic substrate is used, the substrate is deformed due to heat or moisture absorption, and there is a problem that it is difficult to align a mask when forming a TFT array or the like.

There is also a problem that it is difficult to obtain an organic LED element having high image quality.

The present invention provides a light-weight liquid crystal display device and an organic LED device which reduce deformation due to thermal deformation and moisture absorption of a plastic substrate, have high image quality, enable easy mask alignment and can be manufactured with high accuracy. The purpose is to provide.

[0015]

According to a first aspect of the present invention, there is provided:
A first substrate in which electrodes are formed on at least one surface of a plastic layer in which linear or band-shaped fibers are embedded and separated from each other; and a first substrate facing the surface of the first substrate on which the electrodes are formed. A second substrate provided with a transparent layer having a transparent electrode formed on a surface facing the first substrate; and a liquid crystal layer provided between the first substrate and the second substrate. It is a liquid crystal display element.

According to a second configuration of the present invention, there is provided a first substrate having electrodes formed on at least one surface of a plastic layer having carbon fibers embedded therein, and a surface of the first substrate having electrodes formed thereon. A second substrate provided with a transparent layer provided with a transparent electrode on a surface facing the first substrate and a liquid crystal layer provided between the first substrate and the second substrate. A liquid crystal display element comprising:

According to a third aspect of the present invention, there is provided a first substrate having a pair of electrode layers formed on at least one surface of a plastic layer in which linear or band-like fibers are embedded separately from each other; An organic LED element comprising: an organic light emitting layer sandwiched between the pair of electrode layers.

According to a fourth aspect of the present invention, there is provided a first substrate having a pair of electrode layers formed on at least one surface of a plastic layer having carbon fibers embedded therein, and a first substrate sandwiched between the pair of electrode layers. LE provided with a light-emitting organic light-emitting layer
D element.

The operation of the present invention will be described below.

In the first configuration of the present invention, as one substrate of the liquid crystal display element, a plastic substrate in which an electrode is formed on one surface of a plastic layer in which linear or band-like fibers are embedded is provided. (First substrate).

[0021] The first substrate has the characteristic of light weight peculiar to a plastic substrate, but the thermal deformation and the hygroscopic deformation are reduced by the action of the embedded fibers. Further, the mechanical strength of the entire substrate is increased.

Therefore, by using the first substrate as a substrate for a liquid crystal display element, mask alignment becomes easy when forming a TFT array or the like.

Further, when glass is used as the second substrate, which is the opposite substrate, the bonding becomes easy because the thermal expansion coefficient is close.

Further, by using the first substrate as a substrate for a liquid crystal display element, the substrate can be easily held and transported in the manufacturing process, and the manufacturing yield can be improved.

Further, in the first substrate, the embedded fibers are not woven, or the fibers are not directly overlapped or directly intersected, but the linear or band-shaped fibers are separated from each other in the plastic layer. Embedded. Therefore, when a laminated layer containing a fiber cloth impregnated with a resin as in the prior art is used as a substrate, no irregularities due to the weave or overlap of the fiber cloth generated on the substrate surface occur, and the in-plane refractive index And the image quality of the liquid crystal display element is prevented from deteriorating.

According to the second configuration of the present invention, as one substrate of the liquid crystal display element, one of the plastic layers in which carbon fiber, which is a material having a particularly low coefficient of thermal expansion and a high rigidity, is embedded. A plastic substrate (first substrate) having electrodes formed on the surface thereof is used.

The first substrate has a characteristic of light weight peculiar to a plastic substrate, but the deformation of the embedded fiber due to heat and moisture absorption is very small, so that the thermal deformation and moisture absorption deformation are very small. Further, the mechanical strength of the entire substrate becomes extremely high.

By the way, the thermal conductivity of glass is about 0.8 W / m
It has good heat dissipation because it is 600W / mK, which is larger than K and about 0.14W / mK of plastic. The rigidity of carbon fiber is 1E5kg / cm ^{2 for} plastic and 6E for glass.
5kg / cm ^2, compared to as large as 5E6kg / cm ^2.

Therefore, by using the first substrate as a substrate for a liquid crystal display element, mask alignment becomes easy when forming a TFT array or the like.

Further, when glass is used as the second substrate, which is the opposite substrate, bonding becomes easy because the thermal expansion coefficient of the glass is close to that of the glass.

Further, by using the first substrate as a substrate for a liquid crystal display element, the substrate can be easily held and transported in the manufacturing process, and the manufacturing yield can be improved.

In the third configuration of the present invention, the organic LE
As the substrate of the D element, a plastic substrate (first substrate) in which an electrode is formed on one surface of a plastic layer in which linear or band-like fibers are embedded is used.

The first substrate has a characteristic of light weight peculiar to a plastic substrate, but the thermal deformation and the hygroscopic deformation are reduced by the action of the embedded fibers. Further, the mechanical strength of the entire substrate is increased.

Therefore, by using the first substrate as a substrate for an organic LED element, mask alignment becomes easy when forming a TFT array or the like.

Further, by using the first substrate as the substrate of the organic LED element, the substrate can be easily held and transported in the manufacturing process, and the manufacturing yield can be improved.

Further, in the first substrate, the embedded fibers are not woven or are in a state in which the fibers are directly overlapped or intersected directly, but are in a plastic layer in a state where the linear or band-shaped fibers are separated from each other. Embedded. Therefore, when a laminated layer containing a fiber cloth impregnated with a resin as in the prior art is used as a substrate, no irregularities due to the weave or overlap of the fiber cloth generated on the substrate surface occur, and the in-plane refractive index And the deterioration of the image quality of the organic LED element is suppressed.

According to the fourth configuration of the present invention, an organic LED
As a substrate of the element, a plastic substrate (first substrate) in which an electrode is formed on one surface of a plastic layer in which carbon fiber, particularly a fiber having a small coefficient of thermal expansion and a material having high rigidity, is embedded is used. .

The first substrate has the characteristic of light weight peculiar to the plastic substrate, but the deformation of the embedded fiber due to heat and moisture absorption is very small, so that the thermal deformation and moisture absorption deformation are very small. Further, the mechanical strength of the entire substrate is increased.

Therefore, by using the first substrate as the substrate of the organic LED element, mask alignment becomes easy when forming a TFT array or the like.

Further, by using the first substrate as the substrate of the organic LED element, the substrate can be easily held and transported in the manufacturing process, and the manufacturing yield can be improved.

[0041]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the liquid crystal display device according to the first and second configurations of the present invention will be described in more detail.

FIG. 1 is a sectional view showing an example of a liquid crystal display device according to the first and second configurations of the present invention. The substrate 10, which is the first substrate, has an electrode 13 made of a conductive film formed on one surface of a plastic layer 11. Fibers 12 are embedded in the plastic layer 11. Substrate 1
A transparent substrate 14 serving as a second substrate is arranged to face the surface on which the zero electrode 13 is formed. The transparent substrate 14 is formed by forming a transparent electrode 16 on one surface of a transparent layer 15. The transparent electrode 16 is provided on a surface facing the substrate 10. Note that an alignment film is formed on the surface of the electrode 13 (not shown). A liquid crystal layer 17 including a liquid crystal compound is sandwiched between the substrate 10 and the transparent substrate 14 to constitute a liquid crystal display device.

When the above-mentioned liquid crystal display element is used as a transmission type liquid crystal display element, the substrate 10 must also be transparent, and the plastic layer 11 constituting the substrate 10, the fibers 12 embedded therein, and the electrodes 13 are transparent. Materials are used.

The electrodes 13 may form a TFT array.

When the above liquid crystal display element is used as a reflection type liquid crystal display element, a reflective layer is provided on the substrate 10.

The liquid crystal compound forming the liquid crystal layer in the liquid crystal display device of the present invention is not particularly limited, and a liquid crystal compound generally used according to each display system can be used.

Next, the first substrate and the second substrate in the first configuration of the present invention will be further described.

First, the first substrate in the first configuration will be described. The first substrate has an electrode formed on one surface of a plastic layer in which linear or band-shaped fibers are embedded and separated from each other. In the first substrate, the fibers are not woven or woven, such as woven or non-woven fabrics, and are not in a state in which the fibers directly overlap or intersect with each other, but in a state in which linear or band-shaped fibers are separated from each other in the plastic layer. Embedded in Further, it is desirable that the fibers are not exposed outside the plastic layer. Thereby, the occurrence of minute unevenness on the substrate surface is suppressed, and the deterioration of image quality is suppressed to a low level.

Examples of the material of the plastic layer in the first substrate include an epoxy resin, an acrylic resin, a polyimide resin, and an aramid resin. If heat resistance is required, the polyimide resin or the aramid resin may be used. It is desirable to use

The fibers embedded in the plastic layer include linear fibers having a circular, elliptical or polygonal cross section, or band-shaped fibers having a rectangular or flat elliptical shape. A material obtained by etching a foil material may be used. In this case, the light transmittance can be increased by adjusting the pitch between the pixel and the etched hole.

The diameter or width of the fibers embedded in the plastic layer is preferably in the range of 0.01 mm to 0.1 mm. If the diameter or width of the fiber is too large, the substrate becomes thick and the surface becomes uneven, which may result in poor flatness. If the fiber is too small, the mechanical strength may be deteriorated. For this reason, the wiring pattern on the substrate surface may be disconnected.

As the material constituting the fiber, a material having a smaller coefficient of thermal expansion than the linear plastic layer such as carbon, glass, quartz or the like can suppress the coefficient of thermal expansion of the first substrate and reduce the thermal deformation. It is desirable in that it suppresses moisture absorption deformation. In particular, carbon fibers are desirable because of their low coefficient of thermal expansion. When the first substrate is a transparent substrate, it is necessary to use a transparent material such as glass or quartz.

Next, the second substrate in the first configuration will be described. The second substrate has a transparent layer on which a transparent electrode is formed. The second substrate needs to be at least a transparent substrate, and examples thereof include a substrate in which a transparent electrode such as ITO is formed on a layer made of an insulating transparent material such as glass, acrylic resin, polycarbonate, and polyethylene. The transparent layer may have fibers embedded therein.

Next, the first substrate and the second substrate in the second configuration of the present invention will be further described.

First, the first substrate in the second configuration will be described. The first substrate has an electrode formed on one surface of a plastic layer having carbon fibers embedded therein. Carbon, which is a material constituting the fiber, is a material having a small coefficient of thermal expansion, and suppresses the coefficient of thermal expansion of the first substrate, and suppresses thermal deformation and moisture absorption deformation.

In the first substrate, the fibers are not woven or woven, such as woven fabric or non-woven fabric, or are in a state where the fibers are not directly overlapping or intersecting, but are in a state where the linear or band-shaped fibers are separated from each other. It is desirable to be embedded in the plastic layer. Further, it is desirable that the fibers are not exposed outside the plastic layer. Thereby, the occurrence of minute unevenness on the substrate surface is suppressed, and the deterioration of image quality is suppressed to a low level.

Examples of the material of the plastic layer in the first substrate include an epoxy resin, an acrylic resin, a polyimide resin, an aramid resin, and the like. When heat resistance is required, a polyimide resin or an aramid resin is used. It is desirable to use

The carbon fiber embedded in the plastic layer may have any cross section, but may be a circular, elliptical or polygonal linear fiber.
Alternatively, a belt-like fiber such as a rectangle and a flat ellipse may be used. A material obtained by etching a foil material may be used. In this case, by adjusting the pitch between the pixel and the etched hole, light transmittance can be increased without sacrificing the aperture ratio.

The diameter or width of the fiber embedded in the plastic layer is preferably in the range of 0.01 mm to 0.1 mm. If the diameter or width of the fiber is too large, the substrate becomes thick and the surface becomes uneven, which may result in poor flatness. If the fiber is too small, the mechanical strength may be deteriorated. For this reason, the wiring pattern on the substrate surface may be disconnected.

Next, the second substrate in the second configuration will be described. The second substrate includes a transparent layer on which a transparent electrode is formed, similarly to the second substrate having the first configuration described above. The fourth substrate must be at least a transparent substrate,
An example in which a transparent electrode made of ITO or the like is formed on a layer made of an insulating transparent material such as glass, an acrylic resin, polycarbonate, or polyethylene can be given.

In the first and second configurations of the present invention, the materials constituting the first and second substrates are such that the average thermal expansion coefficients of the first and second substrates are close to each other. Good to choose.

In a general TFT-LCD, an allowable difference in thermal expansion coefficient between substrates opposed to each other (an allowable thermal expansion coefficient difference) differs depending on a screen size, an allowable pixel shift length, and a use temperature difference. It is represented by the following equation.

Dα ≦ d1 / dT / L where dα is the allowable thermal expansion coefficient difference, d1 is the allowable pixel shift length,
dT is the temperature difference, and L is the length in the long side direction of the screen.

For example, a TFT-L having one side of 10 inches
With a CD, a pixel shift of about 10 μm can be tolerated. Assuming that the operating temperature is in the range of 10 ° C. to 30 ° C., the difference in the allowable thermal expansion coefficient between the opposing substrates is 4E-6 / ° C. or less.

For example, when a plastic substrate in which carbon fibers are embedded in the vertical and horizontal directions is used as the first substrate, its thermal expansion coefficient is about -0.2E-6 / ° C. A quartz substrate (0.55E-6 / ° C) having a small expansion coefficient or a titanium silicate glass (-0.2
E-6 / ° C.).

When a plastic substrate in which low-density carbon fibers are embedded in the vertical and horizontal directions is used, its thermal expansion coefficient is about 2 to 3E-6 / ° C., for example, borosilicate glass (coefficient of thermal expansion of 3 to 5E- 6 / ° C) 7059 or NA4
Glass having a close thermal expansion coefficient such as 0 or NA35 may be used.

Hereinafter, embodiments of the organic LED device according to the third and fourth configurations of the present invention will be described in more detail.

FIG. 2 is a sectional view showing an example of the organic LED device according to the third and fourth configurations of the present invention. First
The substrate 20, which is a substrate, has a pair of electrodes 23 and 26 formed on one surface of a plastic layer 21. Fibers 22 are embedded in the plastic layer 21. The electrode 23 formed on one surface of the plastic layer 21 is an anode electrode layer made of a conductive film. Then, the electrode 23
The hole transport layer 24 is formed on the surface of the substrate, and the organic light emitting layer 25 is formed on the surface of the hole transport layer 24. The electrode 26 formed on the surface of the organic light emitting layer 25 is a cathode electrode layer made of a conductive film.

An electron transport layer may be additionally provided between the organic light emitting layer 25 and the electrode 26 (cathode electrode layer), or the hole transport layer 24 may be omitted. In either case, the organic light emitting layer is directly or indirectly sandwiched between the anode electrode layer and the cathode electrode layer.

The electrodes 23 may form a TFT array.

Further, a counter substrate or a protective layer may be provided on the electrode 26.

In the organic LED device of the present invention, the materials for forming the anode electrode layer, the hole transport layer, the organic light emitting layer, the cathode electrode layer, and the electron transport layer are not particularly limited, and are generally selected according to the respective light emitting systems. The materials used can be used.

Next, the first substrate in the third configuration of the present invention will be further described.

The first substrate in the third configuration has a structure in which electrodes are formed on one surface of a plastic layer in which linear or band-like fibers are embedded separately from each other. In the first substrate, the fibers are not woven or woven such as a woven fabric or a non-woven fabric, and are not in a state in which the fibers are directly overlapped or intersected, but in a plastic layer in a state in which linear or band-shaped fibers are separated from each other. Embedded. Further, it is desirable that the fibers are not exposed outside the plastic layer. Thereby, the occurrence of minute unevenness on the substrate surface is suppressed, and the deterioration of image quality is suppressed to a low level.

Examples of the material of the plastic layer of the first substrate include an epoxy resin, an acrylic resin, a polyimide resin, and an aramid resin. If heat resistance is required, the polyimide resin or the aramid resin may be used. It is desirable to use

The fibers embedded in the plastic layer include linear fibers having a circular, elliptical or polygonal cross section, or band-like fibers having a rectangular or flat elliptical shape. A material obtained by etching a foil material may be used. In this case, the light transmittance can be increased by adjusting the pitch between the pixel and the etched hole.

The diameter or width of the fiber embedded in the plastic layer is preferably in the range of 0.01 mm to 0.1 mm. If the diameter or width of the fiber is too large, the substrate becomes thick and the surface becomes uneven, which may result in poor flatness. If the fiber is too small, the mechanical strength may be deteriorated. For this reason, the wiring pattern on the substrate surface may be disconnected.

As a material constituting the fiber, a material having a smaller coefficient of thermal expansion than a linear plastic layer such as carbon, glass, quartz or the like can suppress the coefficient of thermal expansion of the first substrate, and reduce the thermal deformation and the like. This is desirable in that moisture absorption deformation is kept low. In particular, a fiber made of carbon has a small coefficient of thermal expansion and is desirable. When the first substrate is a transparent substrate,
It is necessary to use a transparent material such as glass or quartz.

Next, the first substrate in the fourth configuration of the present invention will be further described.

The first substrate in the fourth configuration is one in which electrodes are formed on one surface of a plastic layer in which carbon fibers are embedded. Carbon, which is a material constituting the fiber, is a material having a low coefficient of thermal expansion,
The thermal expansion coefficient of the first substrate is suppressed, and thermal deformation and moisture absorption deformation are suppressed low.

In the first substrate, the fibers are not woven or woven, such as woven fabric or non-woven fabric, or are in a state where the fibers are not directly overlapping or intersecting, but in a state where the linear or band-shaped fibers are separated from each other. It is desirable to be embedded in the plastic layer. Further, it is desirable that the fibers are not exposed outside the plastic layer. Thereby, the occurrence of minute unevenness on the substrate surface is suppressed, and the deterioration of image quality is suppressed to a low level.

Examples of the material of the plastic layer in the first substrate include an epoxy resin, an acrylic resin, a polyimide resin, and an aramid resin. When heat resistance is required, a polyimide resin or an aramid resin may be used. It is desirable to use.

The carbon fibers embedded in the plastic layer may have any cross section, but may be circular, elliptical or polygonal linear fibers.
Alternatively, a belt-like fiber such as a rectangle and a flat ellipse may be used. A material obtained by etching a foil material may be used. In this case, the light transmittance can be increased by adjusting the pitch between the pixel and the etched hole.

The diameter or width of the fibers embedded in the plastic layer is desirably in the range of 0.01 mm to 0.1 mm. If the diameter or width of the fiber is too large, the substrate becomes thick and the surface becomes uneven, which may result in poor flatness. If the fiber is too small, the mechanical strength may be deteriorated. For this reason, the wiring pattern on the substrate surface may be disconnected.

In the third structure or the fourth structure, the opposing substrate or the protective layer provided on the electrode 26 may be made of an insulating transparent material such as glass, epoxy resin, acrylic resin, polycarbonate, polyethylene or the like. Alternatively, an inorganic insulating film such as SiO ₂ or SiNx, or an organic insulating film such as PVA may be used. The method of forming the protective film is PCV
D, CVD, vapor deposition, coating, etc. may be used.

The combination of the first substrate and the opposing substrate or the protective layer is selected such that the average thermal expansion coefficients are close to each other as in the combination of the first substrate and the second substrate in the first configuration or the second configuration. Good to do.

Next, an example of a particularly preferred embodiment of a plastic layer in which fibers are used, which is used in the first substrate of each of the first, second, third and fourth configurations, is shown in FIG. This will be described with reference to FIGS.

First, in order to suppress the expansion of the substrate, it is desirable that a plurality of layers, more preferably three or more layers, composed of rows of fibers are embedded in the plastic layer as shown in FIG. 3, for example. However, it may be a single layer.

FIG. 3 shows the first configuration, the second configuration, and the third configuration.
It is sectional drawing which shows an example of the plastic layer which concerns on the 1st board | substrate of the structure of 4th structure.

The first layer fibers 32 are formed on the plastic layer 31.
Are buried in a direction substantially parallel to the flat surface of the plastic layer 31. Next, plastic layer 3
A plurality of second-stage fibers 33 are embedded in a direction substantially parallel to the flat surface of the first and in parallel with the first-stage fibers 32 in a plurality of directions. Further, a plurality of third-stage fibers 34 are embedded in the direction parallel to the second-stage fibers 33 in a plurality of directions.

In the case where a plurality of layers composed of a row of fibers are embedded in the plastic layer, for example, as shown in FIG. 4, when the direction of the fibers in each layer is different, the expansion of the substrate is suppressed and the strength is reduced. Desirable for improvement.

FIG. 4 shows the first, second, and third configurations.
It is sectional drawing which shows an example of the plastic layer which concerns on the 1st board | substrate of the structure of 4th structure.

The first-stage fiber 42 is formed on the plastic layer 41.
Are buried in a direction substantially parallel to the flat surface of the plastic layer 41. Next, plastic layer 4
A plurality of fibers 43 of the second stage are embedded in a direction substantially parallel to the flat surface of the first and perpendicular to the fibers 42 of the first stage. Further, a plurality of fibers 44 of the third stage are embedded in the direction perpendicular to the plurality of fibers.

The direction of the side of the plastic layer and the direction of the fiber may be parallel or perpendicular as shown in FIGS. 3 and 4, or may be parallel to the direction of the side of the plastic layer as shown in FIG. Alternatively, it need not be vertical.

FIG. 5 shows the first configuration, the second configuration, and the third configuration.
It is a top view showing an example of the plastic layer concerning the 1st substrate of composition of the 4th composition. Rows of fibers 52 are embedded in the plastic layer 51 in a plurality of stages, and the direction of the side of the substrate and the direction of 52 are at about 45 degrees.

It is preferable that the wiring provided on the substrate and the fibers embedded in the substrate have an angle of about 45 degrees with the wiring or be arranged parallel or perpendicular to the wiring in order to make the stress distribution of the element uniform. .

If the angle is other than these angles, the stress distribution when the substrate is deformed depending on the direction is different, and the stress of the wiring is different. Therefore, when the TFT is formed, the TFT characteristics become non-uniform. In addition, the substrate is deformed by the stress, and the wiring is bent.

Further, in the contact section of the plastic layer in which the fibers are embedded, the peripheral parts are easily damaged because the fibers are exposed. In particular, if the conductive carbon fiber or the like is exposed, there is a possibility that a short circuit may occur with peripheral components, which is problematic. Therefore, as shown in FIGS. 6 and 7, for example, the end face of the plastic layer is processed by heat treatment so that the fiber end is located inside the end face of the plastic layer, thereby preventing physical or electrical contact with other parts. can do. At the same time, the effect of chamfering can be obtained.

FIG. 6 shows the first configuration, the second configuration, and the third configuration.
It is sectional drawing which shows an example of the plastic layer which concerns on the 1st board | substrate of the structure of 4th structure. The fiber 62 is embedded in the plastic layer 61, and the end face of the plastic layer 61 is processed into a concave shape.
1 is located inside the end face.

FIG. 7 shows the first configuration, the second configuration, and the third configuration.
It is sectional drawing which shows an example of the plastic layer which concerns on the 1st board | substrate of the structure of 4th structure. The fiber 72 is embedded in the plastic layer 71, and the end surface of the plastic layer 71 is curved so that the end of the fiber 72 is located inside the end surface of the plastic layer 71.

[0101]

EXAMPLE (Example 1) First, a plastic substrate as shown in FIG. 4 was prepared.

Carbon fibers 42, 43, and 44 having a fiber diameter of 0.05 mm are embedded in a plastic layer 41 of 0.3 mm thickness made of epoxy resin, and three layers composed of rows of fibers are formed. ing. That is, a plurality of first-stage fibers 42 are embedded in the plastic layer 41 in a direction substantially parallel to the flat surface of the plastic layer 41. Next, the second-stage fibers 4 are arranged in a direction substantially parallel to the flat surface of the plastic layer 41 and perpendicular to the first-stage fibers 42.
3 are embedded in a plurality of directions. Further, the fibers are embedded in the vertical direction. The thermal expansion coefficient of the plastic layer 31 in which the fibers 42, 43, and 44 were embedded was 5E-6 / ° C.

Next, as shown below, a first substrate and a second substrate in which a TFT array and the like were formed on the plastic layer were prepared, and a TFT-LCD was assembled.

FIG. 8 is a sectional view of the TFT-LCD according to the first embodiment.

First, the diagonal where the carbon fiber 81 is embedded
On a 10-inch plastic layer 82, a SiO 2₂Oh
Bar coating to form gate lines 83 made of MoW etc.
Then, a gate insulating film 84, a-
Si layer 85, n⁺forming an a-Si layer 86;
86, the signal line 87, the source electrode 88, the drain
Electrodes 89 and pixel electrodes 90 are formed by stacking Al / Mo.
Done. On top of this, SiN _xShaped passivation film 91
And the SiN of the pixel part_xA hole was drilled. Polyy on this
A rubbing treatment is performed by forming an alignment film (not shown) of
Thus, a first substrate was obtained.

Next, a second substrate was prepared as follows. 0.5 mm quartz glass 92 (coefficient of thermal expansion 5.5E)
(−7 / ° C.) to form an ITO transparent electrode 93. A rubbing treatment was performed by forming an alignment film of polyimide on the surface on which the transparent electrode 93 was formed.

Next, using the first and second substrates, T
The FT-LCD was assembled.

The surface of the first substrate on which the electrodes were formed and the surface of the second substrate on which the transparent electrodes were formed faced each other, and the periphery was sealed with an epoxy resin, and then TN liquid crystal was injected.

When the first substrate is used as a TFT-LCD substrate in this way, the first substrate is a plastic substrate, but the deformation is 1 μm when forming a TFT array or the like.
There was no problem with mask alignment. In addition, although glass was used as the second substrate as the opposing substrate, it had a close thermal expansion coefficient to the first substrate and was easy to bond. Also this T
The FT-LCD has high rigidity even when heated, and has no problem in transporting the substrate during the manufacturing process.

Further, the image quality of the obtained TFT-LCD was not inferior to the case where a glass substrate was used instead of the first substrate. That is, since the difference in thermal expansion coefficient between the array and the opposing substrate was small, the substrate did not swell or dent, the gap was uniform, and the image quality was uniform.

As a comparative example, a TFT-LCD was manufactured in the same manner using a plastic single-layer substrate without carbon fibers embedded therein instead of the first substrate.
Substrate deformation of about μm occurred, and mask alignment was not possible. When a plastic single-layer substrate was used, the substrate was caught by the device due to deformation during the manufacturing process. Example 2 First, a plastic layer as shown in FIG. 4 was prepared.

A 0.3 mm thick plastic substrate 41 made of epoxy resin is embedded with carbon fibers 42, 43, and 44 having a fiber diameter of 0.05 mm, and three layers composed of rows of fibers are formed. ing. That is, a plurality of first-stage fibers 42 are embedded in the plastic layer 41 in a direction substantially parallel to the flat surface of the plastic layer 41. Next, a plurality of second-stage fibers 43 are embedded in a direction substantially parallel to the flat surface of the plastic layer 41 and perpendicular to the first-stage fibers 42 in a plurality of directions. Further, the fibers are embedded in the vertical direction. The coefficient of thermal expansion of the plastic layer 41 in which the fibers 42, 43, and 44 were embedded was 5E-6 / ° C.

The plastic layer 31 is also mixed with a black pigment powder for absorbing light.

Using the above-mentioned plastic layer, a first substrate on which a TFT array and the like are formed is prepared as follows, and an organic LED is formed.
The ED was assembled.

FIG. 9 is a plan view of the organic LED element according to the second embodiment.

First, an SiO ₂ overcoat is formed on a plastic layer 102 in which carbon fibers 101 are embedded, and a gate line 103 made of MoW or the like is formed.
Further, a gate insulating film 104, a-
A Si layer 105 and an n ⁺ a-Si layer 106 are formed, and n ⁺ a
After forming the Si layer 106, the signal line 107, the source electrode 108, the drain electrode 109, and the pixel electrode 110
o and a film in which aluminum was laminated. An SiN _x passivation film 111 was formed thereon.

Further, on this, the hole transport layer 1 of the organic LED was formed.
PBD, TA2, BN, and OXD were used as 12, Alq3 was formed as the light emitting layer 113, a layer made of polyvinyl carbazole was formed as the electron transport layer 114, and the upper electrode 115 was formed of Ag to obtain a first substrate.

Next, the surface of the first substrate on which the TFT array was formed was covered with a counter substrate 116 made of titanium silicate glass (thermal expansion coefficient: -0.2E-6 / ° C.) to obtain an organic LED.

As described above, by using the first substrate as a substrate for an organic LED element, it is easy to align a mask when forming a TFT array or the like, even though it is a plastic substrate. In addition, when the counter substrate was used, the thermal expansion coefficient was close and bonding was easy.

Further, this organic LED was excellent in luminous efficiency and image quality uniformity.

In the present invention, the TFT array is not limited to the a-Si shown in the embodiment, but may be one using p-Si. The structure of the TFT array is not limited to this structure, and may be placed on a gate or may be modified in other ways.

[0122]

As described above, according to the present invention, there are provided a liquid crystal display element and an organic LED element which can reduce the thermal deformation and the deformation due to moisture absorption of a plastic substrate, have high image quality, and can be reduced in weight. can do.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of a liquid crystal display device according to a first configuration and a second configuration of the present invention.

FIG. 2 is a sectional view showing an example of an organic LED element according to a third configuration and a fourth configuration of the present invention.

FIG. 3 is a sectional view showing an example of a plastic layer of a first substrate according to the present invention.

FIG. 4 is a sectional view showing an example of a plastic layer of a first substrate according to the present invention.

FIG. 5 is a plan view showing an example of a plastic layer of a first substrate according to the present invention.

FIG. 6 is a sectional view showing an example of a plastic layer of a first substrate according to the present invention.

FIG. 7 is a sectional view showing an example of a plastic layer of a first substrate according to the present invention.

FIG. 8 is a cross-sectional view of the TFT-LCD according to the first embodiment.

FIG. 9 is a sectional view of an organic LED according to a second embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Substrate 11 ... Plastic layer 12 ... Fiber 13 ... Electrode 14 ... Transparent substrate 15 ... Transparent layer 16 ... Transparent electrode 17 ... Liquid crystal layer 20 ... Substrate 21 ... Plastic layer 22 ... Fiber 23 ... Electrode (anode electrode layer) 24 ... Positive Hole transport layer 25 Organic light-emitting layer 26 Electrode (cathode electrode layer) 31, 41, 51, 61, 71 Plastic layer 32, 33, 34, 42, 43, 44, 52, 62, 7
2 ... fiber

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H090 JA07 JA16 JB03 JC07 JD14 JD15 JD18 LA01 LA04 3K007 AB13 AB14 AB18 BB07 CA00 CA05 CB01 DA00 DB03 EB00 FA01 5C094 AA02 AA33 AA38 AA43 AA60 BA03 BA27 BA43 DA01 EB05 EB05

Claims (4)

[Claims] 1. A first substrate having an electrode formed on at least one surface of a plastic layer in which linear or band-shaped fibers are embedded and separated from each other, and an electrode of the first substrate is formed. A second layer including a transparent layer provided on a surface facing the first substrate and having a transparent electrode formed on a surface facing the first substrate.
A liquid crystal display device comprising at least a substrate and a liquid crystal layer provided between the first substrate and the second substrate. 2. A first substrate in which electrodes are formed on at least one surface of a plastic layer in which carbon fibers are embedded, and a first substrate is provided so as to face the surface of the first substrate on which electrodes are formed. A second substrate including a transparent layer having a transparent electrode formed on a surface facing the first substrate;
A liquid crystal display device comprising at least a liquid crystal layer provided between the substrate and a substrate. 3. A first substrate having a pair of electrode layers formed on at least one surface of a plastic layer in which linear or band-shaped fibers are embedded and separated from each other, and a narrow space between the pair of electrode layers. An organic LED element comprising: an organic light-emitting layer. 4. A first substrate having a pair of electrode layers formed on at least one surface of a plastic layer having carbon fibers embedded therein, and an organic light emitting layer sandwiched between the pair of electrode layers. Organic LED element provided.