JPH10104561A - Liquid crystal display device and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device which enables the expansion of a display region without a size increase and a process for producing the same. SOLUTION: A counter substrate 14 is stuck via an adhesive 18 applied along the peripheral edges of an array substrate surface on an array substrate 12. The end faces 12c, 14c, 12d, 14d along the adjacent two sides among the four sides of the array substrate 12 and a counter substrate 14 are disposed to line up on the same plane as the plane of the adhesive 18. These two sides are cut together with the adhesive 18 along the cutting lines extending on the adhesive in production stages.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a liquid crystal display device and a method of manufacturing the same.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been widely used as display devices for notebook personal computers, sub-notebook personal computers, etc. because of their excellent features such as thinness, light weight, and low power consumption. I have. In recent years, notebook personal computers have been able to handle more sophisticated information due to the development of CPUs and OSs (operation software), and their performance has been improved to be comparable to desktop personal computers.

[0005] Display devices of personal computers are required to have larger display capacities and display areas as the performance of notebook personal computers is improved. However, notebook personal computers and subnotebook personal computers are required to be portable, so that their size cannot be increased. Therefore, the display device is required to reduce a region other than the display portion, that is, a so-called frame portion.

[0004]

However, the peripheral portion of the liquid crystal display device is coated with an adhesive for bonding the two substrates together as a space necessary for connection with an external circuit and for assembling the liquid crystal display device. Space is needed to In particular, it is impossible to make the space for applying the adhesive unnecessarily narrow in order to maintain the adhesive strength.

[0005] In general, a liquid crystal display device is constructed by bonding two glass substrates with an adhesive applied along the periphery of the glass substrates and sealing liquid crystal between these glass substrates. In this case, the two bonded glass substrates are cut outside the adhesive and processed to a predetermined size. Therefore, a part of the glass substrate remains outside the adhesive, and remains as an extra space. Since the cutting is performed using a scribe machine and a break machine used for ordinary glass cutting, it is difficult to eliminate the space in consideration of the cutting position accuracy.

Further, in the gap between the glass substrates located outside the adhesive, the liquid crystal enters due to the capillary phenomenon in the liquid crystal injection step and remains. The liquid crystal left in this gap is
When the external circuit is attached to the glass substrate, it may ooze out and cause poor contact. For this reason, it is necessary to completely remove the circuit in the cleaning process, which makes the cleaning process cumbersome.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid crystal display device which can enlarge a display area without increasing the size and which is easy to manufacture, and a method of manufacturing the same. It is in.

[0008]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a first substrate having a rectangular shape; and a peripheral portion of the first substrate. A rectangular second substrate bonded to the first substrate via an adhesive disposed in a substantially rectangular shape, and a liquid crystal layer sealed between the first and second substrates; Wherein at least one end surface of at least one of the first and second substrates is provided on the same plane as one side of the adhesive.

According to a second aspect of the present invention, there is provided a liquid crystal display device according to the present invention, wherein the first substrate is formed via a rectangular first substrate and an adhesive applied in a rectangular shape along a peripheral portion of the first substrate. And a liquid crystal layer sealed between the first and second substrates. The first and second substrates are opposed to each other. At least one end face is provided side by side on the same plane as one side of the adhesive.

According to a fifth aspect of the present invention, in the manufacturing method of the present invention, an adhesive is applied in a substantially rectangular shape along the peripheral edge of the surface of the substantially rectangular first substrate, and the substantially rectangular second substrate is applied. To
The first and second substrates are bonded together by the adhesive by superimposing the first and second substrates together with the first substrate and the liquid crystal molecules by the adhesive. Forming a region for enclosing the first and second substrates, curing the adhesive after laminating the first and second substrates, cutting the peripheral portions of the first and second substrates into predetermined dimensions, At this time, at least the second substrate is cut along a cutting line extending so as to overlap at least one side of the cured adhesive, and a liquid crystal is formed in a region surrounded by the first and second substrates and the adhesive. It is characterized by injecting molecules.

According to the liquid crystal display device and the manufacturing method configured as described above, at least one side of the first and second substrates is provided on the same plane as one side of the adhesive, that is, flush with the side of the adhesive. In the portion, the gap between the first and second substrates is eliminated. In the manufacturing process, the side is cut with the adhesive along a cutting line extending on the adhesive.

As described above, by providing at least one side on the same plane as the adhesive, it is possible to remove the substrate portion which has conventionally existed outside the adhesive.
It is possible to enlarge the display area. In addition, since there is no gap between the substrates, extra liquid crystal molecules do not remain between the substrates when the liquid crystal molecules are injected, so that the subsequent cleaning process can be simplified and connection failure of the drive circuit and the like can be prevented. Can be.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1 and FIG.
Has a rectangular array substrate 12 and a counter substrate 14 which are arranged to face each other with a predetermined space therebetween, and a liquid crystal layer 16 sealed between these substrates.

The array substrate 12 has a large number of gate lines and signal lines arranged in a matrix on a glass substrate.
A large number of pixel electrodes, alignment films, and the like are formed at intersections of the gate lines and the signal lines via thin film transistors (not shown). The counter substrate 12 is formed by laminating a color filter, a transparent counter electrode, an alignment film, and the like on a glass substrate.

The array substrate 12 or the counter substrate 1
An adhesive 18 is applied in a rectangular shape along the peripheral edge of the surface of the substrate 4, and the array substrate 12 and the counter substrate 14 are adhered to each other with the adhesive 18 aligned.

The array substrate 12 is formed to have a slightly larger dimension than the opposing substrate 14, and end surfaces 12 a and 12 b along two adjacent sides protrude from corresponding sides of the opposing substrate 14. Also, end faces 12c and 12d along the remaining two sides of the array substrate 12, and the opposing substrate 1 facing the two sides.
4 and the end faces 14c and 14d along the two sides
The two sides 18c, 18d of the adhesive 18 extending along the sides are:
They are formed flush with each other, that is, located in the same plane.

The liquid crystal layer 16 is formed on the array substrate 12,
It is sealed in a region surrounded by the counter substrate 14 and the adhesive 18, that is, a display region 20. Next, a method of manufacturing the liquid crystal display device 10 configured as described above will be described.

As shown schematically in FIG. 3, first, an array substrate 12 and a counter substrate 14 are prepared, and these substrates are washed and subjected to an alignment process. Subsequently, as shown in FIG. 4, an adhesive 18 is applied at a predetermined width to one of the array substrate 12 and the opposing substrate 14, for example, the surface of the array substrate 12, along the periphery thereof. The application of the adhesive 18 is performed by, for example, application using a dispenser or screen printing. In addition, one side 1 of the adhesive 18
8c has a pair of injection ports 2 for injecting liquid crystal molecules.
2, 24 are provided.

Subsequently, spacers are scattered around the area on the counter substrate 14 corresponding to the area surrounded by the adhesive 18 on the array substrate 12 with this area as the center. Then, the opposing substrate 14 is aligned and superposed on the array substrate 12, and is pressed with a predetermined pressure to be bonded to the array substrate. Then, the adhesive 18 is completely cured by being left for about one hour after heating.

Thereafter, the array substrate 12 and the opposing substrate 1
4 is cut to a predetermined size. In this case, first, two adjacent sides of the array substrate 12 and the opposing substrate 14 are cut along cutting lines 24a, 24 extending on the sides 18c, 18d of the adhesive 18.
Cut along b.

The cutting lines 24a and 24b extend substantially on the center lines of the sides 18c and 18d of the adhesive 18, respectively. Then, as shown in FIG. 5, at the time of cutting, the adhesive 18 is cut together with the array substrate 12 and the counter substrate 14.

Subsequently, the remaining two sides of the opposing substrate 14 are cut along connection lines 26a and 26b extending outside the sides 18a and 18b of the adhesive 18, respectively. Further, the remaining two sides of the array substrate 12 are cut along cutting lines 26, respectively.
The cutting is performed along cutting lines 28a and 28b extending outside the a and 26b.

The cutting method is to cut into the surface of the glass substrate of the array substrate 12 and the counter substrate 14 along each cutting line by a scribe machine and hit the same position with a break machine to break the glass substrate and the adhesive 18. Remove.

When a scribe machine or a break machine is used, cut marks, rib marks, new marks, mirror surfaces, etc. are formed on the cut surface. However, after the cutting step, the cut surface is chamfered. In some cases, these features can be eliminated.

In the cutting step, a dicer may be used instead of using a scribe machine or a break machine. In this case, no cut marks or rib marks are formed on the cut surface.

After the cutting is completed, the liquid crystal molecules are injected into the injection ports 22 and 24.
Is injected into the display area 20 from the injection port 22. After the injection is completed,
And the exhaust port 24 is sealed with an adhesive. afterwards,
A polarizing plate (not shown) is attached to the surface of the counter substrate 14, and the manufacture of the liquid crystal display device ends.

The liquid crystal display device 10 constructed as described above
According to the method and the method for manufacturing the same, two of the four sides of the array substrate 12 and the counter substrate 14 are combined with the adhesive along the cutting lines 24 a and 24 b extending on the corresponding sides 18 c and 18 d of the adhesive 18. Therefore, the end faces 12c, 14c, 12d, and 14d along these sides are flush with the adhesive 18, that is, located on the same plane. Therefore, in these two sides, the adhesive 18
By removing the glass substrate portion remaining outside the substrate, the end surface of the substrate and the adhesive 18 can be matched. As a result, the display area 20 can be enlarged without increasing the dimensions of the array substrate 12 and the counter substrate 14, and the display capacity and display area of the liquid crystal display device can be increased.

The array substrate 12 and the counter substrate 14
The end faces 12c, 14c, 12d and 14d of the
And there is no gap between these substrates. In particular, in the portion of the liquid crystal molecule injection port 22,
Since there is no gap between the substrates, extra liquid crystal molecules do not accumulate between the substrates when injecting the liquid crystal molecules. This makes it possible to reduce contact failures when attaching an external circuit and to facilitate cleaning after manufacturing. It is possible to do.

Further, in the manufacture of the above-mentioned liquid crystal display device, it is not necessary to particularly increase the application accuracy of the adhesive and the cutting accuracy of the substrate as compared with the conventional liquid crystal display device, and it is easy to use the existing manufacturing device. Then, the liquid crystal display device can be manufactured.

FIG. 6 shows a liquid crystal display device 10 according to another embodiment of the present invention. According to this embodiment, of the four sides of the array substrate 12 and the opposing substrate 14,
Only the end faces 12c and 14c along the sides are cut along the cutting line extending on the adhesive 18, and the other three sides are cut along the cutting lines extending outside the respective sides 18a, 18b and 18c of the adhesive 18. Have been disconnected.

In the liquid crystal display device having the above structure, at least the end faces 12 of the array substrate 12 and the counter substrate 14 are also provided.
The c and 14c are flush with the adhesive 18, so that the substrate portions located outside these sides can be removed and the gap between the substrates can be eliminated. In particular, by eliminating the gap between the substrates on the side where the liquid crystal molecule injection port is provided as in this embodiment mode, surplus liquid crystal molecules can be effectively prevented from remaining.

According to the embodiment shown in FIGS. 7 and 8, the counter substrate 14 has all the end faces 1 along its four sides.
4a to 14d are cut along a cutting line extending on the adhesive 18, and are flush with each side of the adhesive 18. The array substrate 12 has end faces 12 c and 12 d along two sides cut along a cutting line extending on the adhesive 18.

In the manufacturing process of the liquid crystal display device having the above-described structure, for example, a thin film having a lower adhesive strength than the adhesive force between the substrate 12 and the adhesive 18 on the array substrate 12, for example,
An organic thin film such as a polyimide or a resist is formed in advance, an adhesive 18 is applied on the thin film, and then the array substrate 12 and the counter substrate 14 are bonded to each other. In this case, the thin film is formed under a portion of the adhesive 18 which is removed from above the array substrate 12 by cutting.

Then, the array substrate 12 and the counter substrate 1
When cutting the end surfaces 12c, 14c, 12d, and 14d of the fourth substrate, these two substrates and the adhesive 18 are cut at the same time as in the above-described embodiment. The end surfaces 14a and 14b along the remaining two sides of the counter substrate 14 are cut together with the adhesive 18 and removed from the array substrate 12 side. In this case, since the aforementioned thin film is formed between the cut portion of the adhesive 18 and the surface of the array substrate 12, the cut adhesive can be easily removed from the array substrate side.

When the cut portions of the opposing substrate 14 and the adhesive 18 are removed from the array substrate 12 side, the thin film may remain on the array substrate surface, or may be removed from the array substrate surface together with the cut adhesive 18. It may be.

According to the embodiment shown in FIGS. 7 and 8, the display area can be enlarged without increasing the external dimensions of the liquid crystal display device, as in the above-described embodiment. Also, the end surfaces of all sides of the counter substrate 14 are bonded with an adhesive 18.
Since it is formed on the same side surface as above, it is possible to eliminate a gap between the array substrate 12 and the opposing substrate 14 over the entire circumference, and to reliably prevent surplus liquid crystal molecules from remaining. Can be.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, in each of the embodiments described above, reference numeral 1
The substrate indicated by reference numeral 2 may be configured as a counter substrate, and the substrate indicated by reference numeral 14 may be configured as an array substrate 12.

The cutting line on the adhesive 18 only needs to entirely overlap the adhesive, and does not necessarily have to coincide with the center line of the adhesive. Furthermore, in the above-described embodiment, the active matrix type liquid crystal display device including the thin film transistor has been described. However, the present invention is not limited to this, and other display or driving methods such as STN type and ferroelectric The present invention is also applicable to a liquid crystal display device using liquid crystal, a liquid crystal display device using a diode as an active element, and the like.

[0039]

As described above in detail, according to the present invention, the display area can be enlarged without increasing the external dimensions, and surplus liquid crystal molecules can be prevented from remaining to facilitate cleaning. Liquid crystal display device,
It is possible to provide a manufacturing method capable of easily manufacturing the liquid crystal display device using an existing manufacturing apparatus.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view taken along a line AA in FIG. 1, and FIG. 2B is a cross-sectional view taken along a line BB and CC in FIG.

FIG. 3 is a flowchart showing a manufacturing process of the liquid crystal display device.

FIG. 4 is a plan view showing a state in which an adhesive is applied on an array substrate in a manufacturing process of the liquid crystal display device.

FIG. 5 is a sectional view schematically showing a cutting step of the liquid crystal display device.

FIG. 6 is a plan view of a liquid crystal display device according to another embodiment of the present invention.

FIG. 7 is a plan view of a liquid crystal display device according to still another embodiment of the present invention.

FIG. 8 is a sectional view taken along line DD in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device 12 ... Array substrate 12a-12d ... End surface 14 ... Counter substrate 14a-14d ... End surface 16 ... Liquid crystal layer 18 ... Adhesive 24a, 24b ... Cutting line 26a, 26b ... Cutting line 28a, 28b ... Cutting line

Claims (11)

[Claims] 1. A rectangular first substrate, and a rectangular substrate bonded to the first substrate via an adhesive arranged in a substantially rectangular shape along a peripheral portion of the first substrate. A second substrate having a shape, and a liquid crystal layer sealed between the first and second substrates. At least one of the first and second substrates has an end face on one side. And a liquid crystal display device provided on the same plane as one side of the adhesive. 2. A rectangle-shaped first substrate, and a rectangle bonded to the first substrate via an adhesive arranged in a substantially rectangular shape along a peripheral portion of the first substrate. A second substrate having a shape, and a liquid crystal layer sealed between the first and second substrates, wherein at least one end face of the first and second substrates facing each other is formed of the adhesive. A liquid crystal display device provided side by side on the same plane as one side of the liquid crystal display. 3. A first substrate having a rectangular shape, and a first substrate which is bonded to the first substrate via an adhesive arranged in a substantially rectangular shape along a peripheral portion of the first substrate. 2 substrates, and a liquid crystal layer sealed between the first and second substrates, and two end sides of the first and second substrates adjacent to each other are connected to two adjacent sides of the adhesive. A liquid crystal display device, which is provided side by side on the same plane as the above. A first substrate having a rectangular shape, a rectangular shape having a size smaller than that of the first substrate, and a substantially rectangular shape arranged along a peripheral portion of the first substrate; A second substrate bonded to the first substrate via the adhesive, and a liquid crystal layer sealed between the first and second substrates. The end faces of two adjacent sides of the substrate are provided side by side on the same plane as the two adjacent sides of the adhesive, and the end faces of the other two sides of the second substrate are
A liquid crystal display device, which is provided side by side on the same plane as a side. 5. A substantially rectangular adhesive is applied on the surface of a substantially rectangular first substrate, and the substantially rectangular second substrate is superposed on the first substrate in a state where the second substrate is aligned with the first substrate. Bonding the first and second substrates with the adhesive, and bonding the first and second substrates together.
Forming a region for enclosing liquid crystal molecules with the substrate and the adhesive, curing the adhesive after bonding the first and second substrates, and curing the first and second substrates. A peripheral portion cut to a predetermined size, wherein at least the second substrate is cut along a cutting line extending so as to overlap with at least one side of the cured adhesive; Production method. 6. A liquid crystal display according to claim 5, wherein a cut is made in said second substrate along said cutting line with a diamond or carbide cutter, and then cut along said cut. Device manufacturing method. 7. The method according to claim 5, wherein the adhesive and the second substrate are simultaneously cut by a dicer along the cutting line. 8. A state in which an adhesive is applied in a substantially rectangular shape along the peripheral edge of the surface of the substantially rectangular first substrate, and the substantially rectangular second substrate is aligned with the first substrate. And the first and second substrates are bonded together with the adhesive, and the first and second substrates are bonded together.
Forming a region for enclosing liquid crystal molecules by the substrate and the adhesive, curing the adhesive after bonding the first and second substrates, and curing the first and second substrates. A liquid crystal display characterized in that a peripheral portion is cut to a predetermined size, and at this time, the first and second substrates are cut along a cutting line that extends so as to overlap at least one side of the cured adhesive. Device manufacturing method. 9. The method according to claim 8, wherein a cut is made in the first and second substrates along the cutting line with a diamond or carbide cutter, and then cut along the cut. Of manufacturing a liquid crystal display device. 10. The method according to claim 8, wherein the adhesive and the first and second substrates are simultaneously cut by a dicer along the cutting line. 11. An adhesive is applied in a substantially rectangular shape along a peripheral edge of a surface of a substantially rectangular first substrate, and an adhesive is applied between the adhesive and the surface of the first substrate. A thin film having a weak adhesive force is formed in advance, a substantially rectangular second substrate is superimposed on the first substrate in a state where the second substrate is aligned, and the first and second substrates are bonded with the adhesive. , The first and second
Forming a region for enclosing liquid crystal molecules with the substrate and the adhesive, curing the adhesive after bonding the first and second substrates, and curing the first and second substrates. Cutting the peripheral portion to a predetermined size, and cutting at least one side of the second substrate along a cutting line extending so as to overlap with one side of the cured adhesive; Liquid crystal molecules are injected into a region surrounded by the substrate and the adhesive.