JPH11212103A - Liquid crystal panel manufacturing method, parts used for the same, and liquid crystal panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of manufacturing a compact liquid crystal panel, which can cure a sealing resin in a short time, and has a high adhesive strength, and a component and a liquid crystal panel used therefor. SOLUTION: A light transmission opening is formed in a peripheral portion of a light shielding layer of a light shielding substrate on which a light shielding layer is formed. The opposing substrate on which the lead electrodes are formed and the light-shielding substrate are bonded together with a photo-curable sealing resin, and the liquid crystal is sealed. When curing the seal resin, the seal resin is irradiated with light from the side of the opposing substrate, and the light is irradiated from the side of the light-shielding substrate through the light transmission port formed in the light-shielding layer to cure the seal resin. Let it.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a counter substrate on which a lead electrode is formed and a light-shielding substrate on which a light-shielding layer for blocking light to eliminate crosstalk between pixels are formed by using an ultraviolet-curable sealing resin. The present invention relates to a method for manufacturing a liquid crystal panel holding a bonded liquid crystal, components used for the method, and a liquid crystal panel.

[0002]

2. Description of the Related Art FIGS. 6 to 12 show a conventional liquid crystal panel. FIG. 6 shows a plan view of the liquid crystal panel 14, and dashed lines a,
FIGS. 7A and 7B are cross-sectional views taken along line b.

In the display area, a metal electrode 15 is formed, and in the peripheral portion 2, a counter substrate 5 on which a lead electrode 6 is formed, and
The light-shielding substrate 4 on which the light-shielding layer 1 is formed is bonded with a seal resin 12 via a spacer 11, and a liquid crystal 13 is sealed to form a liquid crystal panel 14.

More specifically, a strip-shaped metal electrode 15 is formed on the counter substrate 5, a lead-out electrode 6 is provided on the outer peripheral edge portion 2 of the display area, and an alignment film 10 which is a polyimide film is printed thereon. You.

As shown in FIG. 8, the light-shielding substrate 4 has a lattice-shaped light-shielding layer 1 formed in the display area to block light between pixels and eliminate crosstalk. In No. 2, an unbroken strip-shaped light-shielding layer 1 is formed to prevent light leakage from the periphery of the panel.

On the light-shielding substrate 4 thus formed, a band-shaped red (R), green (G), and blue (B) color filter layer 7a, which is orthogonal to the metal electrode 15 formed on the counter substrate 5, is formed.
The color filter substrate 8 as shown in FIG. 9 is formed by installing 7b and 7c.

The color filter substrate 8 has a transparent electrode 9 made of ITO (indium oxide-tin oxide) or tin oxide.
Is formed, and an alignment film 10 which is a polyimide film is printed on the transparent electrode 9.

In FIG. 7, the seal resin 12 is provided on the peripheral edge 2 of the light shielding layer 1, but the seal resin 12 may be provided on the outer peripheral edge of the light shielding layer 1 as shown in FIG. As described above, the opposing substrate 5 and the light-shielding substrate 4 are bonded together with the sealing resin 12, and the liquid crystal 13 is sealed between them to form the liquid crystal panel 14.

[0009]

Incidentally, as the sealing resin 12, an epoxy resin-based thermosetting sealing resin 12a has been conventionally used. Since the thermosetting sealing resin 12a takes a long time to cure, especially when assembling the liquid crystal panel 14 by a vacuum injection method, the cell gap swells or the opposing substrate 5 and the light shielding substrate 4 are cured until the sealing resin 12a is cured. It was necessary to pressurize the panel from above and below so as to prevent the displacement from occurring.

When the liquid crystal 13 is supplied to the light-shielding substrate 4, the opposing substrate 5 is bonded thereto, and then the sealing resin 12 is cured. When a liquid crystal 13 is used, the liquid crystal 13 is left in a high-temperature atmosphere for a long time, so that the components in the sealing resin 12a are
3 to disturb the alignment of the liquid crystal.

Therefore, it is necessary to use an ultraviolet-curable sealing resin 12b instead of the thermosetting sealing resin 12a. FIG. 11 shows a liquid crystal panel 14 using an ultraviolet-curable sealing resin 12 b as the sealing resin 12.
It is shown. The structures of the opposing substrate 5 and the light-shielding substrate 4 are almost the same as those in the case where the above-mentioned thermosetting type sealing resin 12a is used. The difference is that the resin 12 is provided further outside the peripheral edge portion 2 of the light shielding layer 1.

When the sealing resin 12b of the liquid crystal panel 14 having such a configuration is cured, the sealing resin 12b shown in FIGS.
As shown in (b), the ultraviolet mask 16 is placed on either side of the opposing substrate 5 or
A method of irradiating the sealing resin 12b with ultraviolet rays 18 through the light transmission holes 17 provided in the above.

When the UV-curable sealing resin 12b is used, the time required to cure the sealing resin is short, so that the cell gap swelling and position can be reduced in a short time regardless of whether the vacuum injection method or the dropping method is used. A panel with less displacement can be manufactured.

However, as shown in FIG. 12A, when the ultraviolet rays 18 are irradiated from the side of the light-shielding substrate 4, if the light-shielding layer 1 and the sealing resin 12b overlap, the ultraviolet rays 18 can be sufficiently irradiated. Because it is not possible, seal resin 1
It is necessary to provide 2b further outside the peripheral portion 2 of the light shielding layer 1. Therefore, a portion other than the display area of the liquid crystal panel 14 becomes large, and there is a problem that the size of the liquid crystal panel 14 cannot be reduced.

Further, a type in which the extraction electrode 6 is formed of a metal film, such as a liquid crystal panel 14 using an active element such as a TFT panel or an MIM panel or a reflection type liquid crystal panel 14 using a metal reflection electrode. In the liquid crystal panel, FIG.
As shown in (b), when the ultraviolet rays 18 are irradiated from the side of the counter substrate 5, the sealing resin 12 becomes a shadow of the extraction electrode 6, and the ultraviolet rays are not sufficiently irradiated. There was a problem of becoming.

The present invention solves the above problems, and provides a method for manufacturing a compact liquid crystal panel which can cure a sealing resin in a short time, has a high adhesive strength, and provides a component and a liquid crystal panel used therefor. .

[0017]

A method of manufacturing a liquid crystal panel according to the present invention is characterized by irradiating light through a light transmitting opening formed in an outer peripheral portion of a display area of a light shielding layer.

According to the present invention, a compact liquid crystal panel which is free from disorder of liquid crystal alignment around the seal due to elution of the sealing resin component and light leakage from the area around the light-shielding layer, has high adhesion strength and uniform display quality, is provided. Can be supplied with productivity.

[0019]

According to the method of manufacturing a liquid crystal panel of the present invention, a counter substrate on which a lead electrode is formed and a light-shielding substrate on which a light-shielding layer for shielding light is formed to eliminate crosstalk between pixels. When manufacturing a liquid crystal panel in which a liquid crystal is sandwiched by a light-curing type sealing resin, the sealing resin is irradiated with light from the counter substrate side to be cured, and the light shielding layer is formed on the sealing resin from the light shielding substrate side. It is characterized by irradiating with light through the light transmission port formed in the substrate and curing the light.

According to this configuration, the photo-curable sealing resin can be sufficiently cured in a short time without enlarging a portion other than the display area. The light-shielding substrate used for the liquid crystal panel is a light-shielding substrate on which a light-shielding layer that blocks light to eliminate crosstalk between pixels is formed, and a light-shielding layer that blocks light to eliminate crosstalk between pixels on a transparent substrate. And a light-transmitting opening in which the light-shielding layer is not formed partially in the region where the light-shielding layer is present is formed at the outer peripheral edge of the display region of the light-shielding layer.

According to this configuration, when the photo-curing type sealing resin is cured, light can be irradiated from both sides of the liquid crystal panel. The same effect can be obtained even if a color filter layer is provided on this light-shielding substrate.

The liquid crystal panel in which the light-shielding substrate and the opposing substrate on which the lead-out electrodes are formed is bonded with a photo-curing type sealing resin to sandwich the liquid crystal has a cross-talk between pixels on the transparent substrate. A light-blocking layer that blocks light to eliminate the light-blocking layer is formed.
A light transmission port in which the light shielding layer is not formed is partially formed in the region where the light shielding layer is present.

According to this configuration, since the sealing resin can be sufficiently cured in a short time, the time during which the liquid crystal is exposed to a high-temperature, high-humidity atmosphere is reduced, and the liquid crystal around the sealing due to the elution of the sealing resin component. A liquid crystal panel having a uniform display quality and a compact liquid crystal panel with no disorder in the alignment and light leakage from the region around the light shielding layer can be obtained.

Further, the light transmission port in the outer peripheral portion of the display area is formed at a position overlapping with a lead electrode provided on the counter substrate. According to this configuration,
Since the sealing resin at the position overlapping with the extraction electrode is irradiated from the side of the light-shielding substrate through the light transmitting port, sufficient curing can be performed in a short time.

In order to sufficiently exert the above curing,
The shape of the light transmission opening is a slit shape extending in the drawing direction of the extraction electrode formed on the counter substrate, and the width thereof is preferably formed to be smaller than the width of the extraction electrode.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. 6 to 12 showing the conventional example.
The same components as those described above are denoted by the same reference numerals and described. (Embodiment) FIGS. 1 to 5 show (embodiment) of the present invention.
Is shown.

FIG. 1 is a plan view of a liquid crystal panel, and FIG.
2A and 2B are cross-sectional views taken along broken lines a and b.
In FIG. 1, the configuration of the TFT array and the like is omitted for simplicity.

The configuration is almost the same as that of the liquid crystal panel 14 of the above-mentioned conventional example, but the shape of the light shielding layer 1 formed on the light shielding substrate 4 is different as shown in FIG. That is, the light transmission port 3 is formed in the peripheral portion 2 of the light shielding layer 1 in order to cure the sealing resin 12b. The shape of the light transmission port 3 corresponds to the pattern of the extraction electrode 6 formed on the counter substrate 5, is a slit shape extending along the extraction direction, and has a width smaller than that of the extraction electrode 6. ing.

In consideration of the positioning accuracy at the time of bonding the light-shielding substrate 4 and the counter substrate 5, the overlap width d of the light-shielding layer 1 and the lead electrode 6 is preferably 7 μm or less.

By arranging the color filter layers 7a to 7c on the light-shielding substrate 4 in the same manner as in the conventional example, the color filter substrate 8 shown in FIG. 4 is formed. This liquid crystal panel 1
When the sealing resin 12b in FIG.
As shown in (a) and (b), ultraviolet rays are cured from both sides of the liquid crystal panel 14 through the light transmission holes 17 of the ultraviolet mask 16.

As shown in FIG. 5A, the light-shielding layer peripheral portion 2
Resin 12b applied to portions other than the light transmission port 3
Is not cured by being blocked by the light shielding layer 1 with the ultraviolet rays 18 radiated through the light irradiation holes 17b, but is cured by the ultraviolet rays 18 radiated through the light transmission holes 17a.

As shown in FIG. 5B, the sealing resin 12b located at the light transmitting port 3 is not cured by the ultraviolet rays 18 radiated through the light transmitting hole 17c because it is blocked by the extraction electrode 6. The ultraviolet rays 18 radiated through the light transmission holes 17d pass through the light transmission ports 3 and are cured.

Therefore, when the ultraviolet rays 18 are irradiated from both sides of the liquid crystal panel 14 during curing of the sealing resin 12b, the sealing resin 12b can be sufficiently and quickly reduced because the light shielding substrate 4 configured as shown in FIG. 3 is used. Can be cured. Further, the liquid crystal panel 14 thus manufactured is
The orientation around the seal resin 12b was not disturbed, the seal adhesion strength was sufficient, and the seal resin 12b was sufficiently cured.

In the above description, ultraviolet light is used as light for curing the sealing resin 12b. However, the present invention is not limited to this. What is necessary is just to select suitably. (Example 1) The liquid crystal panel 1 in the above (embodiment)
In manufacturing the light-shielding substrate 4 as shown in FIG.
Was prepared.

More specifically, first, a chromium-deposited substrate is patterned using a photolithography method, a grid-like light-shielding layer 1 is formed in a display region so as to block light between pixels, and a light-shielding layer peripheral portion 2 is formed. The light transmission port 3 for curing the seal resin 12b was formed.

The shape of the light transmitting port 3 is made to correspond to the pattern of the extraction electrode 6 formed on the counter substrate 5, and has a slit shape extending along the extraction direction, and has a width smaller than that of the extraction electrode 6. .

Next, a color filter layer 7 of red 7a, green 7b, and blue 7c is formed on the light-shielding substrate 4 by a pigment photo method in a direction orthogonal to the extraction electrode 6 formed on the counter substrate 5, and FIG. A color filter substrate 8 as shown was prepared, and a transparent electrode (ITO) 8 was formed on the color filter substrate 8 by sputtering.

Then, an orientation film 10 is printed on the counter substrate 5 on which the extraction electrode 6 is formed and the color filter substrate 8 and subjected to a rubbing treatment at a predetermined angle. An ultraviolet curing effect type sealing resin 12 is printed so that the sealing resin 12b overlaps the peripheral portion 2 of the light shielding layer 1, a spacer 11 is sprayed on the side of the opposing substrate 5, and both substrates are bonded to each other to form an empty cell. Was prepared.

After the liquid crystal material is vacuum-injected into the obtained empty cells, the injection port is sealed to produce a liquid crystal panel 14, and when the sealing resin 12b is cured, 25 mW / cm 2 (4
(Measured at 05 nm) was irradiated from both sides of the substrate for 3 minutes for curing.

As shown in Table 1, the overlap width d of the light-shielding layer 1 of the liquid crystal panel 14 and the extraction electrode 6 is -2 μm.
By changing from m to 10 μm, six types of liquid crystal panels 14 of A1 to A6 were produced.

For comparison with the liquid crystal panels 14 of A1 to A6, a conventional liquid crystal panel 14
Liquid crystal panel B using UV-curable sealing resin 12b
Liquid crystal panel C using thermosetting sealing resin 12a
And the ultraviolet-curable sealing resin 12b is 25
An ultraviolet ray of mW / cm 2 (measured at 405 nm) is irradiated from the side of the color filter substrate 8 for 3 minutes, and the thermosetting sealing resin 12a is bonded in an oven after bonding both substrates.
A 50 degree heat curing step was performed for 2 hours.

The liquid crystal panels 14 of A1 to A6, B and C described above.
About the overlapping portion d of the light-shielding layer 1 and the extraction electrode 6
Table 1 shows the relationship among the width, the type of seal resin, the seal printing position, and the method of curing the seal resin.

[0043]

[Table 1]

The above liquid crystal panels A1 to A6, B and C are placed in a bath in a high temperature and high humidity atmosphere of 85 ° C. and 85% humidity.
After leaving it for 00 hours, it was taken out, and the alignment disorder around the seal resins 12a and 12b and the light leakage from the periphery of the light shielding layer were measured through the polarizing plate. Then, the liquid crystal panel 1
4 was subjected to a peel test to measure the adhesion strength of the seal.

Table 2 shows the obtained results.

[0046]

[Table 2]

As can be seen from the results in Table 2, ultraviolet rays can be irradiated from both sides of the panel by forming the light transmission openings 3 in the peripheral portion 2 of the light-shielding layer. As a result, the sealing resin 12a is cured in a shorter time than when the thermosetting sealing resin 12a is cured.
b can be cured. When the overlapping width between the light transmitting port 3 and the extraction electrode 6 is 7 μm or less, the alignment of the peripheral portion of the sealing resin is not disturbed and the sealing strength is high, so that the sealing resin 12b is considered to be sufficiently cured. Can be

Conversely, in the conventional type liquid crystal panel, when the ultraviolet-curable sealing resin 12b is used, the area other than the display area becomes large, and the liquid crystal panel cannot be designed compact. Further, when the thermosetting sealing resin 12a is used, although the sealing adhesion strength is considerably increased, it takes two hours to cure the sealing resin 12a and it takes a long time.

Although a chromium film is used as the light shielding layer 1 in the above embodiment, the present invention is not limited to this. For example, a chromium-chromium oxide multilayer film or a pigment resin type may be used. The same effect can be obtained.

[0050]

As described above, according to the liquid crystal panel manufacturing method of the present invention, the sealing resin is irradiated with light from the counter substrate side to cure the sealing resin, and the sealing resin is applied to the light shielding layer from the light shielding substrate side. By irradiating and curing the light through the formed light transmission port, a liquid crystal panel having a sufficient seal adhesion strength can be manufactured in a short time for curing the seal.

The liquid crystal panel thus manufactured is
There is no disturbance of liquid crystal alignment around the seal due to elution of the seal resin component, and no light leakage from the area around the light-shielding layer, and the display quality is uniform and compact.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal panel in Embodiment Mode.

FIG. 2 is a cross-sectional view of a liquid crystal panel in Embodiment Mode.

FIG. 3 is a plan view of a light-shielding substrate according to the embodiment.

FIG. 4 is a plan view of a color filter substrate according to the embodiment.

FIG. 5 is a cross-sectional view of a liquid crystal panel in Embodiment.

FIG. 6 is a plan view of a conventional liquid crystal panel.

FIG. 7 is a sectional view of a conventional liquid crystal panel.

FIG. 8 is a plan view of a conventional light-shielding substrate.

FIG. 9 is a plan view of a conventional color filter substrate.

FIG. 10 is a cross-sectional view of a liquid crystal panel using a conventional thermosetting sealing resin.

FIG. 11 is a cross-sectional view of a liquid crystal panel using a conventional ultraviolet-curable sealing resin.

FIG. 12 is a sectional view of a liquid crystal panel using a conventional ultraviolet-curable sealing resin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light-shielding layer 2 Peripheral part 3 Light transmission opening 4 Light-shielding substrate 5 Counter substrate 6 Leader electrode 7 Color filter layer 12a Thermosetting sealing resin 12b Ultraviolet curing sealing resin 18 Ultraviolet

Claims (6)

[Claims] 1. An opposing substrate on which a lead electrode is formed and a light-shielding substrate on which a light-shielding layer for shielding light is eliminated in order to eliminate crosstalk between pixels with a light-curable sealing resin to sandwich liquid crystal. When manufacturing a liquid crystal panel, the sealing resin is irradiated with light from the counter substrate side and cured, and the sealing resin is irradiated with light from the light shielding substrate side through a light transmission opening formed in the light shielding layer. Liquid crystal panel manufacturing method to cure. 2. A light-shielding substrate having a light-shielding layer formed on a transparent substrate for blocking light in order to eliminate crosstalk between pixels, wherein an outer peripheral portion of a display area of the light-shielding layer is provided in an area where the light-shielding layer exists. A light-shielding substrate in which a light-transmitting port having no light-shielding layer is formed. 3. A color filter substrate in which a color filter is arranged on a light-shielding substrate in which a light-shielding layer that blocks light to eliminate crosstalk between pixels is formed on a transparent substrate, wherein an outer peripheral edge of a display area of the light-shielding layer is provided. A color filter substrate in which a light-transmitting opening in which a light-shielding layer is not formed is partially formed in a region where a light-shielding layer is present. 4. An opposing substrate on which a lead electrode is formed and a light-shielding substrate on which a light-shielding layer for shielding light is eliminated by a photo-curing type sealing resin in order to eliminate crosstalk between pixels, and a liquid crystal is sandwiched. A light-blocking layer that blocks light in order to eliminate crosstalk between pixels on a transparent substrate, and an outer peripheral portion of a display area of the light-shielding layer is partially formed in a region where the light-shielding layer exists. A liquid crystal panel in which a light transmission port without a light shielding layer is formed. 5. The liquid crystal panel according to claim 4, wherein the light transmission port at the outer peripheral edge of the display area is formed at a position overlapping with a lead electrode provided on the counter substrate. 6. The liquid crystal panel according to claim 5, wherein the light transmitting port has a slit shape extending in a drawing direction of the drawing electrode formed on the counter substrate, and has a width smaller than the width of the drawing electrode.