JPH10161087A - Liquid crystal display device and production therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce interference patterns without performing the glare treatment of a grain working or the like on the surface of a film base. SOLUTION: This device has supporting planes 16a, 16b supporting a front sheet 12 at the front of a front case 16 and the front sheet 12 is stuck to the supporting planes 16a, 16b with adhesive. Moreover, an LCD unit 11 and a touch panel 13 attached to the LCD unit 11 with a double coated tape 15 are provided in the inside of the front case 16. The peripheral part of the front sheet 12 is an opaque area B and the area other than the area B is a transparent area A and the front sheet 12 is stuck to the supporting planes 16a, 16b of the front case 16 in this opaque area B and also an adhesive layer 10 is provided in such a manner that it covers the transparent area A.

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 in which a front seat is provided on a front surface of a front case, and a liquid crystal unit is provided below the front seat, and a method of manufacturing the liquid crystal display.

[0002]

2. Description of the Related Art In recent years, a liquid crystal display device having a touch switch on a display screen has been widely used due to its easiness of operation, and when a use environment (factory, outdoor, etc.) is severe, a front panel is required. Generally, a protective sheet called a sheet is attached to the display screen.

In such a liquid crystal display device, as shown in FIGS. 5 and 6, a front sheet 52 composed of an opaque area B at the periphery and a transparent area A at the other is provided with pointing surfaces 56a, 56b of a front case 56. An LCD (Liquid Crystal Display) unit 51 including a liquid crystal layer, a light guide path plate, and the like, a touch panel (film) 53, and the like are provided therein.

Here, this liquid crystal display device uses an adhesive 54
An air space 57 is formed between the front sheet 52 and the touch panel 53 which are attached by the above.

[0005] In such a conventional liquid crystal display device, a structure in which a touch switch is depressed from the front sheet or from bending of the front sheet, as shown in FIG. The front sheet 52 is distorted, and the front sheet 52 and the touch switch 53 stick to each other, causing an interference pattern called Newton's ring, which gives a viewer a discomfort or an unpleasant sensation.

In order to solve such inconvenience, glare processing such as graining (chemical processing) is conventionally performed on the upper surface of the touch panel 53 as shown in FIG. Are scattered to reduce the occurrence of interference patterns.

In manufacturing the above-described liquid crystal display device,
After bonding the mother glass substrate on which the transparent electrodes and the alignment film are formed and the spacers are arranged, with the upper and lower sealants, the cell container is taken out from the bonded mother glass substrate, and liquid crystal is injected into the cell container. The method includes a cell manufacturing process for manufacturing a liquid crystal unit and a module manufacturing process for assembling a mounting board or the like on which a driver LSI for driving the liquid crystal unit, a power supply circuit and the like are arranged, and manufacturing a finished product.

In the above-mentioned cell process, a process of dividing the bonded mother glass substrate and taking out a plurality of cell containers is called a break process.

In this breaking step, as shown in FIG. 8A, a scratch 611 is formed on the mother glass 61 along a line to be divided (referred to as a scribe step).
When the mother glass substrate 61 is placed on the bottom plate 611 having a predetermined cushioning property, and the mother glass substrate 61 having no scratches is hit with a bar 71 on a scribe line (line with a scratch). FIG. 8B
As shown in (2), the glass is broken along the scribe line and the cell container is taken out.

[0010]

However, in such a conventional liquid crystal display device, glare processing such as graining is performed on the upper surface of the touch panel 53, so that the occurrence of interference patterns due to irregular reflection of light can be reduced. However, there is a problem in that what should be transmitted light is scattered, and the display screen becomes dark and difficult to see.

In a break step in the cell manufacturing process of the liquid crystal display device, as shown in FIG. 7, a scratch 611 is formed on the mother glass 61 along a line to be divided, and
The glass is broken by hitting the scribe line with a bar 71 from the opposite side of the scribe surface 11 and the cell container is taken out. Therefore, the scribe line needs to be at least 10 mm from the edge of the mother glass.
Even if it is 5 mm, it may not break.

For this reason, the mother glass 61 must have a portion between the edge and the scribe line which is not necessary for forming the cell container, and there is a problem in that there is waste.

Further, in the above-described breaking step, the scratch is made along the scribe line of the mother glass using a diamond cutter or the like. However, when the cutter blade becomes dull due to the use, the scratch has a predetermined depth. It does not enter so much, so that sometimes it does not break along the scribe line neatly, leaving unnecessary portions.

In the process of removing the unnecessary portion (repair process), since the distance from the edge is insufficient, the unnecessary portion cannot be divided by the above-described process, and it is difficult to take measures. There was a problem.

In view of the above problems, a first object of the present invention is to provide a liquid crystal display device that reduces interference patterns without performing glare processing such as graining on the surface of a mother glass substrate. is there.

A second object of the present invention is to eliminate the need for a portion between an edge and a scribe line in a mother glass substrate when performing a break step in a cell manufacturing process of a liquid crystal display device, and to provide a method in a case where a crack remains. An object of the present invention is to provide a method of manufacturing a liquid crystal display device that enables a process of removing an unnecessary portion.

[0017]

According to a first aspect of the present invention, there is provided a liquid crystal display having a front seat provided on a front surface of a front case, and a liquid crystal unit provided below the front seat. In the display device, an adhesive layer having high transparency and low adhesiveness is provided between the front sheet and the liquid crystal unit.

According to a second aspect of the present invention, in the first aspect of the present invention, the front sheet has an opaque region at a peripheral portion and a transparent region at the other portion, so that the transparency is high and An adhesive layer having low tackiness covers the transparent area.

According to a third aspect of the present invention, after a mother glass substrate on which a transparent electrode and an alignment film are formed and spacers are arranged is bonded with upper and lower sealants, a cell container is removed from the bonded mother glass substrate. In the method of manufacturing a liquid crystal display device having a breaking step of taking out, in this breaking step, a flaw is formed on a scribe line for taking out a cell container from the mother glass substrate, and a planar bar is provided near the scribe line having the flaw. To break the mother glass substrate on the scribe cry.

According to a fourth aspect of the present invention, in the third aspect of the present invention, a portion separated by 0.3 to 1 mmm from the scratch is hit with the planar bar.

According to the present invention, since an adhesive layer having high transparency and low adhesiveness is provided between the front sheet and the liquid crystal unit, when the front sheet is pressed, the adhesive layer is applied to the front sheet and the liquid crystal unit. The interposition therebetween prevents the front sea from contacting the liquid crystal unit.

Further, in a break step in a manufacturing process of the liquid crystal display device, a scratch is made on a scribe line to take out the cell container from the mother glass substrate, and the scratched surface is hit with a planar bar so that the mother glass is hit. The substrate can be split on the scribe cry.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the liquid crystal display device according to the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of the liquid crystal display device according to the present invention.

As shown in FIG. 1, the liquid crystal display device of this embodiment has support surfaces 16a and 16b for supporting the front seat 12 on the front surface of the front case 16,
The support surfaces 16a, 16
b.

In the liquid crystal display device, an LCD unit 11 composed of a liquid crystal layer, a light guide path plate, and the like, and a touch panel 13 attached to the LCD unit 11 with a double-sided tape 15 are provided inside a front case 16. It is configured.

Further, the liquid crystal display device has an adhesive layer 10 having high transparency and a predetermined viscosity between the touch panel 13 provided on the LCD unit 11 and the front sheet 12. I have.

Here, the front sheet 12 has an opaque area B at the peripheral portion and a transparent area A at the other portion, and the opaque area B is bonded to the support surfaces 16a and 16b of the front case 16. The adhesive layer 10 is provided in the transparent area A.

As described above, according to the liquid crystal display device of this embodiment, the front sheet 12 is pressed down in order to provide the adhesive layer 10 having high transparency and low adhesiveness between the front sheet 12 and the touch panel 13. Even so, the contact between the front sheet 12 and the touch panel 13 is prevented.

For this reason, when the adhesive layer 10 is interposed between the front sheet 12 and the touch panel 13 (a distance far greater than the wavelength of light), the interference generated due to the difference in the optical path difference between the transmitted light, the reflected light, and the light. Generation of a pattern can be prevented.

In the liquid crystal display of this embodiment,
Although the touch panel 13 is provided on the LCD unit 11, other than this, the touch panel may not be provided on the LCD unit, and an adhesive layer may be provided between the LCD unit and the front sheet.

Next, a method of manufacturing the liquid crystal display device of this embodiment will be described.

The feature of the manufacturing method of the liquid crystal display device of the present invention is that the electrode pattern of a transparent electrode (in the case of a simple matrix liquid crystal display) or the electrode pattern of a transistor array or the like (in the case of an active matrix liquid crystal display).
Is not included in the substrate manufacturing process for manufacturing a glass substrate, and thus the description of the substrate manufacturing process is omitted.

In manufacturing the liquid crystal display device of this embodiment, as shown in FIG. 2A, a predetermined organic polymer resin is applied to a glass substrate 20 made of mother glass formed in a substrate manufacturing process. This is rubbed in a certain direction to form an alignment film 21 (alignment film forming step).

When an alignment film 21 is formed on a glass substrate 20 made of mother glass, dust or the like that causes the maximum deterioration of the liquid crystal display device is cleaned, and then, as shown in FIG. The agent 22 is applied (sealant applying step).

Next, as shown in FIG. 2C, a spacer 23 made of plastic or the like is placed in the glass substrate 20 coated with the sealing agent 22 in order to keep the cell gap constant.
Are placed (spacer placement step).

Subsequently, as shown in FIG. 2D, a glass substrate 20 made of mother glass having spacers 23 disposed thereon.
Then, another glass substrate 20 made of mother glass formed in the same manner is overlapped and pressed under pressure to form a plurality of cell containers 2 (cell container forming step).

Thereafter, as shown in FIG. 2E, the scribe lines 24 of the upper and lower glass substrates 20 are cut out of the plurality of cell containers 2 and each cell container 2 is taken out (break step). Liquid crystal is injected into the cell container 2 to complete the LCD unit 11.

After that, when the LCD unit 11 is completed, the touch panel 1 is attached to the end of the LCD unit 11 (in the area located in the opaque portion B) with the double-sided tape 15.
After attaching 3, it is attached to the front case 16.

Subsequently, the adhesive 14 is applied to a portion of the front sheet 12 corresponding to the support surfaces 16a and 16b of the front case in the opaque region B, and the portion covering the transparent region A is highly transparent and has a predetermined viscosity. When an adhesive is applied and attached to the front case 16 and the touch panel 13, a liquid crystal display device having the adhesive layer 10 in the transparent region A is manufactured.

The liquid crystal display device of the present invention has a manufacturing method not included in the conventional manufacturing method in the break step.
The method will be described below.

When the spacer arrangement step is completed, FIG.
As shown in (a), a scratch 201 is formed on a scribe line 24 for cutting the glass substrate 20 to a predetermined depth by a diamond cutter or the like.

Next, as shown in FIG.
0.3 to 1m from scribe line 24 with 1
The glass substrate 20 is split by hitting the place separated by m with a break bar 30 having a flat surface to break the glass substrate 20, and the glass substrate 20 on the opposite side is split in the same manner. Remove the cell container from 20.

In the manufacturing method of the liquid crystal display device of this embodiment, the scribe line 24 for taking out the cell container from the mother glass substrate 20 in the break step.
The glass substrate 20 can be split on the scribe cry 24 by scratching the top and hitting the vicinity of the scratched surface with the planar break bar 30.

That is, since it is not necessary to split the glass substrate 20 on a rubber having cushioning properties as in the prior art, the distance between the scribe line 24 and the edge of the glass substrate 20 does not matter, and the glass substrate 20 is wasted. Can be omitted.

In the break step, the cutter blade is blunted, so that it does not break cleanly along the scribe line 24.
Even when an unnecessary portion remains, when removing the unnecessary portion, the distance from the edge does not matter, so that the processing can be easily performed.

When the break bar 40 hits the vicinity of the scribe line 24 of the glass substrate 30 in the break step, as shown in FIG. 4, the protrusion 401 having a height of 0.3 to 1 mm is used. It is preferable that the break bar 30 strikes the glass substrates 20, 30 at a position 0.3 to 1 mm from the scribe line 24 by aligning the end of the additional member 40 provided with the scribe line 24.

[0048]

As described above, according to the first or second aspect of the present invention, by providing an adhesive layer having high transparency and low adhesiveness between the front sheet and the liquid crystal unit,
When the front sheet is pressed, an adhesive layer is interposed between the front sheet and the liquid crystal unit, preventing contact between the front sheet and the liquid crystal unit, preventing occurrence of an interference pattern, and obtaining a good-looking display screen. it can.

According to the third or fourth aspect of the present invention, in the break step in the manufacturing process of the liquid crystal display device,
The mother glass can be split on the scribe cry by scoring the scribing line to remove the panel from the mother glass and hitting the scratched surface with a planar bar.

Therefore, unlike the conventional manufacturing method, the mother glass does not need a portion between the edge and the scribe line which is not necessary for forming the cell container, and the cost can be reduced.

If the scratch does not enter the predetermined depth due to the dulling of the blade of the cutter and an unnecessary portion remains, the position of the scratch with respect to the edge does not matter. Can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is an explanatory diagram illustrating a manufacturing process of an LCD unit.

FIG. 3 is an explanatory diagram illustrating a scribe step in the method for manufacturing a liquid crystal display device according to the present invention.

FIG. 4 is an explanatory diagram of another scribing step in the method for manufacturing a liquid crystal display device according to the present invention.

FIG. 5 is a cross-sectional view illustrating a schematic configuration of a conventional liquid crystal display device.

FIG. 6 is an explanatory diagram of a display screen of a conventional liquid crystal display device.

FIG. 7 is an explanatory diagram of the occurrence of an interference pattern in a conventional liquid crystal display device and a countermeasure thereof.

FIG. 8 is an explanatory view of a scribing step in a conventional method for manufacturing a liquid crystal display device.

[Description of Signs] 10 Adhesive layer 11 Liquid crystal unit 12 Front sheet 13 Touch panel 14 Adhesive 15 Double-sided tape 16 Front case 16a, b Support surface A Transparent region B Opaque region 20 Mother glass 21 Orientation film 22 Sealing material 23 Spacer 24 Scribe Line 201 Scratch 30 Break bar 40 Auxiliary member

Claims (4)

[Claims] 1. A liquid crystal display device having a front sheet provided on a front surface of a front case and a liquid crystal unit provided below the front sheet, wherein the liquid crystal unit has high transparency between the front sheet and the liquid crystal unit, and has an adhesive property. A liquid crystal display device comprising an adhesive layer having a weak property. 2. The front sheet has an opaque area at the periphery and a transparent area at the other part, and the adhesive layer having high transparency and low adhesiveness covers the transparent area. The display device according to claim 1, wherein: 3. A liquid crystal having a break step of bonding a mother glass substrate on which a transparent electrode and an alignment film are formed and on which spacers are arranged with upper and lower sealants, and taking out a cell container from the bonded mother glass substrate. In the manufacturing method of the display device, in the breaking step, a flaw is formed on a scribe line for taking out the cell container from the mother glass substrate, and the vicinity of the flawed scribe line is hit with a planar bar, A method for manufacturing a liquid crystal display device, comprising dividing a mother glass substrate on the scribe cry. 4. The method for manufacturing a liquid crystal display device according to claim 3, wherein a portion separated from the flaw by 0.3 to 1 mmm is hit with the planar bar.