JPH11337952A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the productivity of a device in which a sealant at an injection port does not protrude from the injection port toward the outside of a substrate circumference to improve the space efficiency, the sealant is prevented from infiltrating to the other side of the substrate to improve the yield and further, a position to be coated by the sealant can easily be visualized. SOLUTION: In construction in which a liquid crystal composition 32 is held between two substrates 12 and 22, the circumferences of display regions of the substrates are stuck by a sealant 30, the liquid crystal composition 32 is injected into a gap from an injection port 31 provided in a part of the sealant and the injection port is sealed with a sealant 40, notches 18 and 24 are formed in the substrates of the parts of the injection port and the sealant 40 is contained in the notches.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a liquid crystal display device.

[0002]

2. Description of the Related Art A liquid crystal display device has a structure in which a liquid crystal material is sandwiched between two glass substrates, the periphery of which is surrounded by a sealing material, and the two substrates are simultaneously bonded by a sealing material. An inlet is provided for injecting material into the substrate gap.

FIG. 6 is a schematic diagram of a conventional liquid crystal display device. The first substrate 61 and the second substrate 62 are kept at a predetermined interval by a sealing material 63. A liquid crystal composition (not shown) is injected into the gap between the substrates 61 and 62 from the injection port 64,
Sealing material 65 sandwiched and applied to the side of the substrate at the injection port
Seals the liquid crystal. Here, on the side where the injection port is arranged, the substrate end is straight, and therefore, when the sealing material 65 is applied to the injection port, only the sealing section has a shape protruding from the substrate side. . This is because the sealing material does not enter the injection port due to the liquid crystal material remaining in the injection port and the viscosity of the sealing material. Therefore, a sufficient amount of the sealing material is used to increase the reliability of the sealing. This is because it is necessary to include it in the part.

[0004]

In recent years, there has been a strong demand for a liquid crystal display device to be thinner and lighter. In particular, since a large display screen size is desired despite having the same external dimensions as the conventional one, the size of the display area outside the display area is desired. Needs to be smaller. However, conventionally, since the sealing material protrudes from the periphery of the substrate at the injection port, the size of the projecting portion due to the sealing material must be always considered when designing the module, which hinders the miniaturization of the module. Was.

If the injection port is arranged at the corner of the substrate in order to reduce such a protrusion, the sealing material may wrap around both sides sandwiching the corner. There was a problem that lowering.

The present invention has been made in view of the above problems, and has as its object to provide a structure of a liquid crystal display device with good space efficiency.

[0007]

According to the present invention, there is provided a first substrate having a display electrode in a display area, a second substrate facing the first substrate, and a first substrate held between the first substrate and the second substrate. A liquid crystal material to be provided and a seal which is arranged around the display area so as to bond the first substrate and the second substrate to each other with the liquid crystal material interposed therebetween and forms an injection port for injecting the liquid crystal material. In a liquid crystal display device comprising a material and a sealing material for sealing the injection port, a cutout for accommodating the sealing material in at least one of the first substrate and the second substrate at the injection port portion And a liquid crystal display device characterized by forming the above.

Further, the present invention provides a liquid crystal display device wherein the cutout portion of the injection port extends over the entire thickness of the substrate.

Further, the present invention provides a liquid crystal display device characterized in that a cutout portion of the injection port is formed by chamfering a substrate.

[0010]

Next, an embodiment of the present invention will be described. FIGS. 1 to 3 show an active matrix type liquid crystal display device.
The substrate 11 and the second substrate 21 forming the opposing substrate are kept at a predetermined distance by a sealant 30.

A first substrate 11 on which pixel electrodes are arranged in a matrix has signal lines / scanning lines 13, thin film transistors 14, and pixel electrodes 15 formed in a display region A of a quadrilateral glass substrate 12, and non-display around the display region. A drive circuit 16 including a thin film transistor and an electrode pad 17 are formed in a region B. A cutout 18 is formed in the injection port portion of the glass substrate 12 along the thickness direction of the glass substrate.

The counter substrate 21 has a transparent conductive film of ITO formed on one surface of a glass substrate 22 as a counter electrode 23, and has a notch 24 near the injection port of the glass substrate 22 along the thickness direction.

The substrates 11 and 21 are bonded together by a sealant 30 applied on the non-display area B so as to surround the display area A with a gap sandwiching the liquid crystal composition therebetween. Seal material 3
A part of 0 has an injection port 31 for injecting a liquid crystal material, and after bonding, a liquid crystal composition 32 is injected into the gap through the injection port 31. The width of the gap is, for example, 5 μm because it is the thickness of the liquid crystal layer in the display area. Therefore, the opening of the injection port is about 5 μm in height, about 10 mm in opening width, and about 1 mm in depth. The inlet 31 is located in the cutouts 18 and 24 of both substrates, and as shown in FIGS. 3A to 3B, the cutout portion is sealed with a synthetic resin made of, for example, a thermosetting epoxy resin. The material 40 is applied and the injection port 31 is sealed. The thickness of both substrates is 0.7 mm, and the cut depth of the notch is 1 mm. The notch can be easily formed by a sand blast method.

In the above, even if a sufficient amount of the sealing material 40 is put in the injection port, the sealing material 40 fits into the cutout portion, and the sealing material 40 protrudes from the edge of the substrate other than the injection port at the side where the injection port is arranged. This eliminates the need to do so, thus improving the space efficiency in module design. Further, by applying the sealing material 40 to the notch portion, even when the injection port is arranged at the corner of the substrate, the sealing material 40 can be prevented from going around the other side, and the yield can be improved.

Furthermore, since the injection port has a notch, the position where the sealing material is applied can be easily recognized, and the productivity can be improved.

In the above embodiment, the shape of the notch is rectangular, but if it is large enough to accommodate the sealing material,
The same effect can be obtained even if the shape is a polygon or an arc.

FIG. 4 shows another embodiment of the present invention, in which notches 24a are formed only in the glass substrate 22a of the opposite substrate.
Is formed. The same reference numerals as those in FIG. 1 indicate the same parts.

This structure has an effect that the sealing material does not protrude from the substrate because the sealing material 40a fits in the notch as in the embodiment of FIG. Also, unlike the above embodiment, the notch is formed only on one substrate, so that the workability of forming the substrate is good.

In the present embodiment, the notch is provided only in the glass substrate 22a of the second substrate, but the same applies to the case where the notch is provided only in the glass substrate 12 of the first substrate.

FIG. 5 shows another embodiment of the present invention, in which the corner of one side 25 on the gap side of the substrate 22b of the counter substrate 21 is chamfered. By fitting the sealing material 50 in a chamfered portion as a notch, it is possible to prevent the protrusion from the substrate side. This chamfer can be formed only in the vicinity of the inlet.

It is needless to say that the present invention can be applied not only to the active matrix type described in the above embodiment, but also to a liquid crystal display device having another structure such as a simple matrix type.

[0022]

According to the present invention, the sealing material at the injection port does not protrude outside the substrate side from the injection port at the side where the injection port is disposed, so that a liquid crystal display with good space efficiency can be obtained. Equipment can be provided. In addition, since the sealing material is applied to the cutout portion, when the injection port is arranged at the corner of the substrate, the sealing material can be prevented from wrapping around the other side, and the yield is improved. Furthermore, the presence of the notch in the injection port makes it easy to visually recognize the position where the sealing material is applied, thereby improving productivity.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a structure according to an embodiment of the present invention;

FIG. 2 is a schematic plan view of FIG. 1 as viewed from above,

FIG. 3 is a sectional view of FIG. 2 taken along the line AA,
(A) is a sectional view showing the structure before the sealing material is applied, (b) is a cross-sectional view showing the structure after the sealing material is applied,

FIG. 4 shows another embodiment, in which (a) is a schematic plan view,
(B) is a cross-sectional view of (a) cut along line BB,

FIG. 5 is a cross-sectional view illustrating another embodiment.

FIG. 6 is a schematic plan view illustrating a conventional device.

[Explanation of symbols]

 11: Array substrate (first substrate) 12: Glass substrate 15: Pixel electrode 18: Notch 21: Counter substrate (second substrate) 22: Glass substrate 24: Notch 30: Seal material 31: Injection port 40: Sealing Lumber

Claims (3)

[Claims] A first substrate having a display electrode in a display area; a second substrate facing the first substrate; a liquid crystal material held between the first substrate and the second substrate; A sealing material that is arranged around the display area so as to bond one substrate and the second substrate to each other with the liquid crystal material interposed therebetween and forms an injection hole for injecting the liquid crystal material; A liquid crystal display device including a sealing material for stopping the sealing material, wherein at least one of the first substrate and the second substrate is provided with a cutout for accommodating the sealing material at the injection port. Liquid crystal display. 2. The liquid crystal display device according to claim 1, wherein the cutout portion of the injection port extends over the entire thickness of the substrate. 3. The liquid crystal display device according to claim 1, wherein a cutout portion of the injection port is formed by chamfering a substrate.