JPH089710Y2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] In the present invention, at least a liquid crystal is sealed between a pair of transparent substrates opposed to each other with a sealing material interposed therebetween, and a color filter is provided on one of the transparent substrates. In a liquid crystal display device having a structure capable of color display, when the sealing of two transparent substrates is performed after dropping and injecting the liquid crystal in the manufacturing process, the sealing material is cured while being in direct contact with the liquid crystal. In order to prevent the liquid crystal from being destroyed by the use of a color filter, a separation band was formed between the pair of transparent substrates between the seal material and the screen portion. It is designed not to exceed the liquid crystal of.

[Industrial application field]

The present invention relates to a liquid crystal display device capable of color display used in, for example, a liquid crystal color television.

[Conventional technology]

A conventional liquid crystal display device has a structure in which a pair of transparent substrates are opposed to each other with a sealing material interposed therebetween, and liquid crystal is sealed in a sealed space formed by the transparent substrate and the sealing material. Then, as a method of enclosing the liquid crystal between the transparent substrates, generally, a so-called liquid crystal cell, in which a pair of transparent substrates are arranged to face each other with a sealing material as described above, is created in advance, and then a reduced pressure injection method or the like There is known a method of injecting liquid crystal into the above liquid crystal cell. However, since the amount of liquid crystal used in this method is very large, as an alternative method to this method, after the liquid crystal is dropped and injected into the uncured sealing material on one of the transparent substrates, A method has been proposed in which the other transparent substrate is brought into close contact therewith, and the liquid crystal is injected by curing the sealing material in this state.

[Problems to be solved by the device]

In the case of the latter injection method described above, the amount of liquid crystal used is smaller than that of the former method, but on the other hand, the sealing material for adhering the two transparent substrates is cured while being in direct contact with the liquid crystal. Therefore, there is a risk of destroying the liquid crystal. That is, the sealing material may be thermosetting, ultraviolet curable, or curable by other methods,
Both of them are hardened by a chemical reaction, and can be a very fatal cause of destruction for a liquid crystal having a high chemical reactivity.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to cure a sealing material when sealing two transparent substrates after dropping and injecting liquid crystal. An object of the present invention is to provide a liquid crystal display device capable of reliably preventing the liquid crystal from being destroyed.

[Means for solving the problem]

A liquid crystal display device according to the present invention includes at least a pair of transparent substrates facing each other with a predetermined space therebetween, transparent electrodes formed on the inner surfaces of the pair of transparent substrates, and the pair of transparent substrates. A color filter formed on the inner surface of one of the transparent substrates, and formed between the pair of transparent substrates by a color filter substrate on the outer periphery of the screen portion in which the transparent electrodes and the color filters are arranged. A separator; a sealant formed between the pair of transparent substrates to surround the separator; and a liquid crystal at least enclosed in the separator between the pair of transparent substrates. It is a thing.

[Action]

According to the present invention, a separation band is provided between the pair of transparent substrates to partition the sealing material and the screen portion, and the liquid crystal is sealed inside the separation band. Therefore, the liquid crystal does not come into contact with the uncured sealant, and even if the liquid crystal comes into contact with the sealant and decomposes when the sealant cures, this effect affects the liquid crystal in the screen section by the separation band. It does not obstruct the liquid crystal in the screen and the screen.

Further, although it is easy to introduce a new process to form the above-mentioned separation zone, the cost is high because the number of manufacturing processes is increased. On the other hand, in the present invention, since the separation band is formed of the color filter substrate, the separation band can be formed by using the color filter forming process, and therefore, it is not necessary to increase the number of manufacturing steps, and thus the cost is also reduced. It can be suppressed as much as possible.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a sectional view of an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an enlarged sectional view showing a part of the transparent substrate 1 viewed from the direction of arrow A.

First, as shown in FIG. 1, a pair of transparent substrates 1 and 2 made of glass or the like are arranged to face each other at a predetermined interval. As shown in FIG. 2, a transparent electrode 7 and color filters 8, 9 and 10 which will be described later are provided between the transparent substrates 1 and 2.
A separation band 4 made of a color filter substrate is formed on the outer periphery surrounding the arrayed screen portion 3, and a sealing material 5 is further formed around the separation band 4. As is apparent from FIG. 1, a liquid crystal 6 is enclosed in a hermetically-sealed space that is doubly surrounded by a separation band 4 and a sealing material 5 between the transparent substrates 1 and 2, and even if the liquid crystal 6 is separated during the encapsulation. Even if the liquid crystal enters the sealing material 5 side beyond the band 4, the liquid crystal and the liquid crystal in the separation band 4 are completely separated by the separation band 4.

Then, the inner surface of one transparent substrate 1 has one direction (first
In the figure, a plurality of transparent electrodes 7 made of an ITO film or the like extending in the left-right direction (parallel to the paper surface) are arranged at regular intervals, and the ends thereof are used as leads 7a as shown in FIG. It is taken out. As is apparent from FIG. 3, red, green, and blue color filters 8, 9, and 10 extending in the same direction as the transparent electrode 7 are repeatedly and alternately arranged on each transparent electrode 7. The film thicknesses d _R , d _G , and d _B are formed so as to gradually increase in this order, that is, d _R <d _G <d _B. The thickness of the color filter is made different for each color in this way because the electro-optical characteristics of the liquid crystal change according to the wavelength of light and the layer thickness of the liquid crystal, and the transmission and blocking characteristics of light are accordingly changed. This is because it changes, and it is necessary to set the layer thickness (gap) of the liquid crystal for obtaining the optimal light transmission state and light blocking state for each color. The color filters 8, 9 and 10 are covered with an alignment film 11 as shown in FIG. 1, and the alignment film 11 is in direct contact with the liquid crystal 6.

Further, the separation band 4 described above utilizes the respective forming steps of the color filters 8, 9 and 10 as is apparent from FIG.
It is formed by sequentially laminating color filter base materials such as casein, which is a material for forming these color filters. That is, the bottom layer 4a of the separation band 4 is formed simultaneously when the red color filter 8 is formed, the central layer 4b of the separation band 4 is formed simultaneously when the green color filter 9 is formed next, and finally the blue color filter is formed. The uppermost layer 4c of the separation band 4 is formed at the same time when the filter 10 is formed. Therefore, the thickness of the separation band 4 is the total thickness d ₀ (= d _R + d _G +) of the respective thicknesses d _R , d _G and d _B of the color filters 8, 9 and 10.
d _B ).

Inside the other transparent substrate 2, as shown in FIG. 1, it extends in a direction orthogonal to the transparent electrode 7.
A plurality of transparent electrodes 12 made of an ITO film or the like are arranged at regular intervals, and the ends thereof are taken out to the outside as leads 12a, as is apparent from FIG. A plurality of pixels are formed in the portions facing each other with the transparent electrode 7, and a region in which a plurality of these pixels are arranged serves as a screen portion. The transparent electrode 12 is covered with an alignment film 13,
The alignment film 13 is in direct contact with the liquid crystal 6.

Further, although not shown in the drawing, polarizing plates are provided on the outer surfaces of the transparent substrates 1 and 2 so as to have a predetermined angle such as 90 ° with each other, and further outside the transparent substrate 1. Is provided with a light source such as a fluorescent lamp or a light emitting diode as a backlight.

The liquid crystal display device of the present embodiment having the above-described configuration has a structure in which the sealing material 5 between the transparent substrates 1 and 2 and the screen portion 3 are partitioned by the separation band 4 as described above. Therefore, in order to fill the liquid crystal 6 between the transparent substrates 1 and 2, the separation band 4 is formed on the transparent substrate 1 using the process of forming the color filters 8, 9 and 10 as shown in FIG. ,
After forming the uncured sealing material 5 surrounding it, liquid crystal is dropped and injected into the area surrounded by the separation band 4, and then the other transparent substrate 2 is brought into close contact therewith, and in this state By curing the sealing material 5, the transparent substrate 1,
The liquid crystal 6 can be enclosed between the two. Therefore, even when the transparent substrates 1 and 2 are in close contact with each other, part of the liquid crystal is separated by the separation band 4.
Even if the liquid crystal in contact with the sealing material 5 is disassembled and destroyed when the sealing material 5 is cured, the broken liquid crystal is completely removed from the liquid crystal of the screen portion 3 by the separation band 4. Since the liquid crystal of the screen portion 3 is separated, the influence of the destroyed liquid crystal does not reach the liquid crystal of the screen portion 3. Therefore, it is possible to prevent the liquid crystal of the screen portion 3 from being destroyed and perform normal display driving.

From this fact, there is a possibility that a chemically unstable material can be used as the liquid crystal 6, that is, a liquid crystal having more optimal characteristics from more liquid crystal materials regardless of the chemical stability. You will be able to select the material.

Moreover, since the liquid crystal 6 of the screen portion 3 is doubly protected by the separation band 4 and the sealing material 5, it is possible to obtain higher reliability against external stress than the conventional liquid crystal display device.

Further, since the separation band 4 can be formed by using the color filter forming process as described above, it is not necessary to introduce a new manufacturing process, and thus the cost can be suppressed as low as possible.

In the above embodiment, the film thickness d ₀ of the separation band 4 is the total value (= d _R + d _G of the film thicknesses d _R , d _G , and d _B of the color filters 8, 9, 10).
+ D _B ), and the case where this total value is equal to the target gap between the transparent substrates 1 and 2 has been described, but if the target gap is different from the above total value, the separation band 4 It suffices to adjust the film thickness d ₀ of. For example, if you want to make the gap thin, set the separation band 4 at the bottom 4a and the center 4b.
2 layer structure only (thickness d _R + d _G ), central part 4b and top part 4c only 2 layer structure (thickness d _G + d _B ), or bottom part 4a and top part
A two-layer structure (film thickness d _R + d _B ) having only 4c may be used. Also,
When the thickness is set to be slightly smaller than the total value of the three film thicknesses or the two film thicknesses, the separation band 4 is easily crushed by the pressure in the vertical direction, so that the transparent substrate 1,
Pressure may be applied until a desired gap between the two is obtained, and the sealing material 5 may be cured in this state. Further, if it is desired to set the thickness slightly larger than the above total value, the exposure amount when the separation band 4 is formed by the photolithography method is made larger than the exposure amount for the color filter, so that the thickness is slightly thicker than the above total value. You can

Further, even if the structure of the transparent electrode and the color filter is different from that of the above-mentioned embodiment, the present invention can be applied as long as the structure can form the separation band between the seal material and the screen portion.

[Effect of device]

According to the present invention, a separation band is provided between the transparent substrate and the sealing material to separate the screen portion from each other, so that the liquid crystal does not contact the uncured sealing material and the liquid crystal does not contact the sealing material. Even when the liquid crystal is disassembled, it is possible to prevent the influence of the influence on the liquid crystal of the screen portion by the separation band and prevent the liquid crystal of the screen portion from being broken.

Moreover, since the liquid crystal in the pixel portion is doubly protected by the separation band and the sealant, it is possible to obtain higher reliability against external stress than the conventional liquid crystal display device.

Further, since the separation band can be formed by utilizing the color filter forming process, it is not necessary to introduce a new manufacturing process, and the cost can be suppressed as much as possible.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a plan view of the same embodiment, and FIG. 3 is an enlarged view of a part of the transparent substrate 1 viewed from the direction of arrow A in the same embodiment. FIG. 1, 2 ... Transparent substrate, 3 ... Screen section, 4 ... Separation band, 4a
...... Bottom, 4b ...... Center, 4c ...... Top, 5 ...... Sealant, 6 ...... Liquid crystal, 7 ...... Transparent electrode, 8, 9, 10 ...... Color filter, 11 ...... Alignment film, 12 …… Transparent electrode, 13 ……
Alignment film.

Claims (1)

[Scope of utility model registration request] 1. A pair of transparent substrates provided to face each other with a predetermined space therebetween, transparent electrodes formed on the inner surfaces of the pair of transparent substrates, and one of the pair of transparent substrates. A color filter formed on the inner surface of the transparent substrate; and a separation band formed between the pair of transparent substrates on the outer periphery of the screen portion where the transparent electrodes and the color filters are arranged by a color filter substrate, A liquid crystal display device comprising: a seal material formed between a pair of transparent substrates so as to surround the separation band; and a liquid crystal sealed in at least the separation band between the pair of transparent substrates.