JP2769407B2 - LCD panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display panel. More specifically, the present invention relates to a liquid crystal display panel having a structure in which a liquid crystal material can be reliably and quickly filled between two transparent substrates.

[0002]

2. Description of the Related Art In a conventionally used liquid crystal display panel, two rectangular transparent substrates each having an electrode film and the like are formed around a periphery of a sealing agent formed in a rectangular shape along an edge of the substrate. The layers are adhered at regular intervals, and the gap is filled with a liquid crystal material. FIG. 4 shows an example of such a conventional liquid crystal display device. That is, in FIG.
Is an explanatory plan view, and (b) is an explanatory sectional view (the dimensional relationship is not accurate). In FIG. 4, reference numerals 21 and 22 denote substantially rectangular glass substrates used as transparent substrates, and reference numeral 23 denotes a sealant layer formed in a substantially rectangular shape along the edge of the glass substrate 21. Two glass substrates 21 and 22 and sealant layer
A liquid crystal material is filled in a space surrounded by 23, a polarizing plate (not shown) or the like is provided, and an electrode film for each pixel is driven to perform display on the surface of the liquid crystal display panel.

A method of manufacturing this liquid crystal display panel will be described.

First, a large number of glass substrates (for example, 100 mm × 50 mm) of a liquid crystal display panel can be formed.
An electrode film to be formed on each glass substrate is formed on a large glass plate with a size of about m using an ITO film or SnO ₂ film, etc. by vapor deposition, sputtering, spraying, CVD, etc., and photolithography technology for each unit. The alignment film is formed for each unit.

Next, in order to bond the two glass substrates at a constant gap, a spacer is interposed, and a sealant layer is formed around the glass substrate of each unit by a printing method or the like. This sealant layer is formed in each unit so as to be along the edge slightly inside the edge of the glass substrate after cutting, and two sheets are laminated in the state of a large glass plate and then cut into each unit.

Therefore, the conventional sealant layer is formed in a substantially rectangular shape like a rectangular glass substrate (FIG. 4).
(A)). An opening 23a is formed in a part of the sealant layer so that a liquid crystal material can be filled. At this time, a thermosetting epoxy resin or an ultraviolet curable resin is used as the sealant.

[0007] Then, after the bonded body of the glass substrate cut into each unit is evacuated for about 12 hours, the opening 23a side of the sealing agent layer 23 is immersed in a container filled with a liquid crystal material such as nematic liquid crystal. , Atmospheric pressure, depending on the size of the display panel, but leave for several hours to several days
A liquid crystal material 24 is injected from a by a capillary phenomenon. When the injection of the liquid crystal material 24 into the gap between the glass substrates is completed, the opening
23a is sealed with an epoxy resin or an ultraviolet curable resin (23b in FIG. 4A).

[0008]

As described above, the liquid crystal material is injected into the gap between the glass substrates by utilizing the capillary phenomenon after the gap between the glass substrates is once evacuated. Since the viscosity is high, there is a problem that it takes time for the liquid crystal material to spread to every corner of the gap between the glass substrates. For example, it takes two to three hours for a small panel having a size of 50 mm square, and a little over three days for a panel having a size of 200 mm square.

Further, at the four corners of the sealant layer, the liquid crystal material may not be spread and bubbles may be generated. When such bubbles are generated, the bubbles move during use of the liquid crystal display device,
Depending on the pixel, the display may be lost or the display may be unstable, resulting in reduced performance. In addition, even if bubbles are not formed, there is a problem that a very long liquid crystal filling time is required to completely fill the corners.

An object of the present invention is to provide a liquid crystal display panel which can quickly and reliably spread a liquid crystal material to every corner of a gap between glass substrates.

[0011]

According to the present invention, there is provided a liquid crystal display panel comprising two rectangular transparent substrates each having an electrode film formed thereon, and the two transparent substrates held at a fixed interval via a sealant layer. A liquid crystal display panel having a liquid crystal material filled in a gap between two transparent substrates, wherein the sealant layer is formed along a side edge of a side of the rectangular transparent substrate, and the transparent substrate Are formed in an arc at the corner of , and
The two transparent substrates outside the arc-shaped sealant layer
In the vicinity of each edge of the transparent substrate,
And a reinforcing portion for preventing cracking during break .

In this liquid crystal display panel, it is preferable that the arc of the sealant layer formed at the corner of the transparent substrate has a radius of 1/25 to 1/100 of the short side of the rectangular transparent substrate.

[0013]

[0014]

According to the present invention, since the four corners of the sealant layer for bonding the two transparent substrates are formed in an arc shape, the liquid crystal material to be filled is easy to flow, and the liquid crystal material is filled in the gap between the two transparent substrates without generating bubbles. reliably, and with which quickly filled, the size
Prevent lateral cracking when breaking transparent substrates
Can be .

[0015]

Next, the present invention will be described in detail with reference to the drawings.

In FIGS. 1 and 2, reference numerals 1 and 2 denote transparent substrates, which in this embodiment are made of a rectangular glass substrate. Reference numeral 3 denotes a sealant layer for bonding the two glass substrates 1 and 2 at a constant gap. As described above, the unit in which the glass substrates 1 and 2 are fixed to the fixed gap by the sealant layer 3 is, as described above, a large glass plate of about 400 mm × 400 mm, an electrode film, an alignment film, a sealant layer, etc. Is formed and bonded, and then cut for each unit. The electrode film is formed by an evaporation method, a sputtering method, or the like and a photolithography technique.
The sealant layer 3 is formed of a TO film or the like, and is formed by a printing method or the like. For example, in a display panel of 100 mm × 50 mm, the dimension A from the edge of the glass substrate to the outer end of the sealant layer 3 is about 0.8 mm, and the dimension B from the inner end of the sealant layer 3 is 1.5 m.
It is preferable that m and the R of the corner are about 1 mm. In addition, an opening 3a for filling a liquid crystal material is formed by not attaching a sealant to a part of one side of the sealant layer 3.

The radius of curvature R of the arcs formed at the four corners of the sealant layer 3 depends on the size of the glass substrate 1, but is 1/100 to 1/25 of the short side of the rectangular glass substrate. It is preferable to form it. That is, if the radius of curvature is smaller than this, it takes time to fill the liquid crystal material, and if the radius of curvature is larger than this, the area of the liquid crystal display is undesirably reduced. In the above example, when R = 0.5 mm, the filling time of the liquid crystal took 3 hours, and when R = 2 mm, the filling was completed in 1 hour. In addition, as a sealing agent used at this time, a conventionally known thermosetting resin such as a room temperature curable epoxy resin and a phenol resin, or an ultraviolet curable resin such as an acrylic resin can be used. The distance D between the glass substrates is usually about 6 μm. In order to fill the gap between the glass substrates 1 and 2 with a liquid crystal material, first,
After vacuuming the environment for about 12 hours, the opening 3a
Is immersed in a container filled with a liquid crystal material such as a nematic liquid crystal, returned to normal pressure, and left for about 1 hour. When the injection of the liquid crystal material into the gap between the glass substrates is completed, the opening 3a is sealed with a sealing portion 3b such as an ultraviolet curable resin. The liquid crystal material is injected into the gap by utilizing the capillary phenomenon after the inside of the glass substrate is once evacuated to a vacuum. However, bubbles are easily formed, and the corners, particularly the corners, are hardly filled with the liquid crystal material. However, in the present liquid crystal display panel, the shape of the four corners of the sealant layer is made into an arc shape, so that the flow of the liquid crystal material in the vicinity of the sealant layer becomes smooth, and the liquid crystal material can be quickly and reliably injected into every corner, No bubbles are formed. In the case of the above-mentioned embodiment of R = 1 mm, it takes only about 1 hour to fill the liquid crystal material to every corner in the gap, which is much shorter than the conventional about 3 hours.

Thereafter, a liquid crystal display panel is formed by disposing a polarizing plate or the like in the same manner as in the prior art, and by driving an electrode film formed on a glass substrate for each pixel, a surface portion of the liquid crystal layer is formed. Is displayed.

In the above embodiment, a glass substrate was used.
A transparent substrate other than a glass substrate can be used.

FIG. 2 is a partially enlarged plan view showing another embodiment of the present invention, in which a reinforcing portion 5 is formed at a position away from a circular arc at the corner of the sealant layer 3. Here, as shown by reference numeral 5 in FIG. 2, the reinforcing portion is formed by applying a sealing agent or the like to the outside of the arc portion of the sealing agent layer 3 and does not have a sealing function and is scribed. This is to prevent cracks from entering on the sealant layer side from the break lines (P and Q in FIG. 2). When the reinforcing portion 5 is formed in this way, it is possible to prevent a crack from being formed on the side of the glass substrate 1 to be used when a scribe break is performed from the large glass plate to the glass substrate 1 of each unit. The reinforcing portion 5 can be formed at the same time when the sealant layer 3 is formed by a printing method using the same material as the sealant layer. The reinforcing portion 5 is provided with the sealing agent layer 3.
Is preferably formed on the extension of the straight line portion or slightly outside the portion because it is possible to prevent lateral cracking at the time of scribing and breaking the large glass sheet. In the above example, the dimension E with respect to the end of the glass substrate is about 0.4 mm.

In the embodiment shown in FIG. 3, a branch-like extending portion 6 is formed at the corner of the sealing agent layer 3 as a reinforcing portion. In this case as well, a sealing member as shown in FIG. Agent layer 3
As in the case of the reinforcing portion 5 formed at a position spaced outward from the corner of the glass substrate, the guide line serves as a guideline for scribing and breaking the glass substrate 1, and the occurrence of a break inside the glass substrate can be prevented.

[0022]

According to the present invention, since the corners of the gaps between the glass substrates filled with the liquid crystal material are formed in arcs, the liquid crystal material can be filled quickly and reliably.

As a result, the work of filling the liquid crystal material is greatly reduced, thereby contributing to cost reduction. In addition, since the filling is completely performed, no bubbles are generated, and the bubbles move in the liquid crystal material, thereby deteriorating the display characteristics. Thus, a liquid crystal display device having excellent display performance can be obtained.

[Brief description of the drawings]

FIGS. 1A and 1B are an explanatory plan view and an explanatory sectional view showing an embodiment of a liquid crystal display panel of the present invention.

FIG. 2 is a partially enlarged plan view showing another embodiment of the liquid crystal display panel of the present invention.

FIG. 3 is a partially enlarged plan view showing still another embodiment of the liquid crystal display panel of the present invention.

4A and 4B are an explanatory plan view and an explanatory sectional view showing a seal shape of a conventional liquid crystal display panel.

[Explanation of symbols]

 1, 2 glass substrate 3 sealant layer 4 liquid crystal material 5 reinforcement

Claims (2)

(57) [Claims] 1. A rectangular 2 on which an electrode film is formed, respectively.
A liquid crystal display panel having two transparent substrates and a liquid crystal material filled in a gap between the two transparent substrates held at a fixed interval via a sealant layer, wherein the sealant layer includes: The side of the rectangular transparent substrate is formed along the side edge, the corner of the transparent substrate is formed in an arc shape , and the outer side of the arc-shaped sealant layer
In the vicinity of each edge of the two transparent substrates, a seal is provided.
To prevent the transparent substrate from cracking at the time of break.
Liquid crystal display panel with strong parts formed . 2. An arc of the sealant layer formed at a corner of the transparent substrate is 1/25 of a short side of the rectangular transparent substrate.
2. The liquid crystal display panel according to claim 1, wherein the radius of the liquid crystal display panel is 1/100.