JP2003161927A - Method for manufacturing liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a liquid crystal display device by which a buffer material is rapidly and highly accurately stuck to a liquid crystal display element at a low cost without requiring any special means to position the separate buffer material on the liquid crystal display element by sticking the buffer material to the element while turning on a pixel for positioning and displaying a positioning mark of the buffer material. <P>SOLUTION: The pixels for positioning 27 consisting of mutual intersections of a pair of stripe shaped transparent electrodes 30, 31 are formed outside a display region 6 on the inside surfaces of both transparent substrates 4, 5. The positioning mark 28 for sticking the buffer material 21 to the element is displayed by turning on the pixels for positioning 27 and the buffer material 21 is stuck to the element via the positioning mark 28. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid crystal display device, and more particularly, the liquid crystal display element is incorporated in the housing with a buffer member sandwiched between the liquid crystal display element and the housing. The present invention relates to a method for manufacturing a liquid crystal display device suitable for the above.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display device has been widely used as a display means for a mobile phone or a vehicle, because of its light weight, low power consumption, high density display and high contrast.

FIG. 3 shows an example of such a conventional liquid crystal display device. The liquid crystal display device 1 has a main body 2 in which a main function for liquid crystal display is provided. It has a liquid crystal display element 3 to fulfill.

The liquid crystal display element 3 has two transparent substrates 4 and 5 made of a glass substrate or the like and parallel to each other.
Both transparent substrates 4 and 5 are attached to each other via a frame-shaped seal 7. The liquid crystal 8 is placed in the space surrounded by the transparent substrates 4 and 5 and the seal 7.
Is enclosed.

As shown in FIG. 4, a pair of striped transparent electrodes 9 made of ITO (indium tin oxide) or the like are provided on both inner surfaces of the transparent substrates 4 and 5 facing each other.
10 are formed to cross each other at the top and bottom,
A pixel 11 as a display unit of liquid crystal display is formed by the intersection of these transparent electrodes 9 and 10. Areas of the transparent substrates 4 and 5 on which the pixels 11 are formed are referred to as a display area 6 for displaying information such as characters and images.

Both transparent electrodes 9 and 10 are connected to a liquid crystal drive circuit (not shown), and a liquid crystal drive voltage can be applied to an arbitrary pixel 11 of both transparent electrodes 9 and 10 via this liquid crystal drive circuit. As a result, the orientation of the liquid crystal 8 at the portion to which this voltage is applied is partially changed, and a predetermined liquid crystal display is performed.

On both transparent electrodes 9 and 10, a pair of alignment films 18 and 1 that have been rubbed in a predetermined direction are provided.
9 is formed.

Outside the transparent substrates 4 and 5, there are disposed a pair of polarizing plates 15 and 16 for regulating the vibration direction of transmitted light from a light source 13 such as a backlight.

In manufacturing the liquid crystal display device 1 having such a structure, first, two transparent substrates 4 and 5 are formed.
The transparent electrodes 9 and 10 are formed by forming a transparent conductive film made of ITO on the surface of each of them by a sputtering method or the like, and then patterning both transparent conductive films in stripes.

Then, an alignment film 1 is formed by rubbing at least a predetermined direction on both transparent electrodes 9 and 10.
8 and 19 are formed, and the transparent substrates 4 and 5 are opposed to each other so that the transparent electrodes 9 and 10 formed on the transparent substrates 4 and 5 intersect each other. They are attached to each other via the frame-shaped seal 7. As a result, the pixel 11 including the intersection of the transparent electrodes 9 and 10 is formed.

After the bonding of the both transparent substrates 4 and 5 is completed, the inside of the space surrounded by the both transparent substrates 4 and 5 and the seal 7 is passed through an injection port (not shown) of the liquid crystal 8 formed in the seal 7. The liquid crystal 8 is injected into, and then the injection port is sealed.

The liquid crystal display element 3 is formed by disposing a pair of polarizing plates 15 and 16 outside the transparent substrates 4 and 5, respectively.

Next, the transparent electrodes 9 of the liquid crystal display element 3,
By connecting a voltage applying means (not shown) such as a flexible wiring board to the terminal portion of 10 and incorporating the liquid crystal display element 3 into the housing 2 together with the light source 13 such as a backlight,
The liquid crystal display device 1 is formed.

Here, conventionally, when the liquid crystal display element 3 is incorporated into the housing 2, the liquid crystal display element 3 and the housing are properly assembled from the viewpoint of preventing the liquid crystal display element 3 from rattling. A cushioning member 21, which is sometimes called a damper, is interposed between the body 2 and the body 2 to be assembled.

In this way, the buffer member 2 is attached to the liquid crystal display element 3.
When 1 is attached, the display area 6 of the liquid crystal display element 3 for displaying an image, a character, or the like is shielded from light by the buffer member 21 unless the position of attaching the buffer member 21 is adjusted with a high degree of accuracy. There is a risk.

Therefore, conventionally, when the buffer member 21 is attached to the liquid crystal display element 3, the attachment is performed by using a special alignment means such as a jig which is separate from the liquid crystal display element 3. Was becoming.

[0017]

However, when the cushioning member 21 is aligned by using such a special alignment means, it hinders the rapid manufacture of the liquid crystal display device 1 and also the liquid crystal display device 1 However, there is a problem in that the manufacturing cost of the product becomes expensive.

The present invention has been made in view of the above problems, and by adhering the buffer member with the alignment pixel of the buffer member displayed with the alignment mark of the buffer member displayed. An object of the present invention is to provide a method for manufacturing a liquid crystal display device, which does not require a special alignment means separate from the liquid crystal display element, and which can attach a buffer member quickly and accurately at low cost. It is a thing.

[0019]

In order to achieve the above-mentioned object, a method of manufacturing a liquid crystal display device according to claim 1 of the present invention is characterized in that a striped pattern is formed on the inner surface of both transparent substrates outside the display area. Forming a positioning pixel composed of a pair of transparent electrodes intersecting with each other, and turning on the positioning pixel to display a positioning mark for a buffer member, and the positioning mark for the buffer member is displayed through the positioning mark. The point is to arrange members.

By adopting such a method, it is possible to display the alignment mark for the cushioning member by turning on the alignment pixel, so that the liquid crystal display for aligning the cushioning member can be displayed. The cushioning member can be aligned with high accuracy without requiring any special means separate from the element, and the cost can be reduced and the manufacturing efficiency can be improved. Since the pixel can be easily formed by the same process as the pixel formed in the display area, the alignment can be performed more easily.

A feature of the method of manufacturing a liquid crystal display device according to a second aspect is that in the first aspect, the alignment marks are displayed in a double line segment shape having a predetermined gap, and the buffer member is provided in the gap. The point is that the cushioning member is arranged with the ends aligned.

By adopting such a method, the cushioning member can be aligned more easily and highly accurately.

The method of manufacturing a liquid crystal display device according to a third aspect is characterized in that, in the first or second aspect, the liquid crystal is a memory type liquid crystal capable of maintaining a lighting state even when no voltage is applied. There is a point.

By adopting such a method, it is not necessary to perform the work of disposing the buffer member while the wiring for lighting the alignment pixel is fixed to the liquid crystal display element. Therefore, the work of disposing the cushioning member can be performed more smoothly.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a method for manufacturing a liquid crystal display device according to the present invention will be described below with reference to FIGS.

The same reference numerals will be used for parts having the same or similar basic structure as the conventional ones.

In the embodiment of the method for manufacturing the liquid crystal display device 25 in this embodiment, when the liquid crystal display element 26 is incorporated in the housing 2, the buffer member 21 is attached to the liquid crystal display element 26, and the buffer member 21 is attached. It is the same as the conventional one in that the liquid crystal display element 26 is assembled while being sandwiched between the liquid crystal display element 26 and the housing 2.

However, in this embodiment, when the liquid crystal display element 26 is assembled in the housing 2, the buffer member 21 is formed by a special alignment means separate from the liquid crystal display element such as a jig as in the conventional case. Do not align the position of pasting.

In this embodiment, the alignment pixels 27 are formed outside the display areas 6 of the transparent substrates 4 and 5, and the alignment pixels 28 are turned on to display the alignment marks 28. The buffer member 21 is aligned through the alignment mark 28.

That is, as shown in FIG. 1, the transparent substrate 4
In the display area 6, I
A stripe-shaped transparent electrode 30 for alignment (a transparent electrode on the outer right side is not shown) made of TO or the like is formed, and in the transparent substrate 5, the IT is formed on the upper outer side and the lower outer side of the display region 6.
A stripe-shaped transparent electrode 31 for alignment (a transparent electrode on the outer right side is not shown) made of O or the like is formed.

In addition, the pixel 11 in the display area 6, that is, the formation range of the transparent electrodes 9 and 10 for forming the information display pixel 11 is extended to the outside of the display area 6 to form a transparent electrode for alignment. Form. By doing so, the intersections of the transparent electrodes that intersect the alignment transparent electrodes 30 and 31 become the alignment pixels 27. That is, the alignment pixels 27 are formed so as to surround the outside of the display area 6.

The alignment pixels 27 are arranged in the display area 6
It may have the same configuration as the information display pixel 11 formed in the above. In this case, the transparent electrode formed by extending the formation range of the transparent electrode from the display area is formed with the same width as that of the display area. Then, the transparent electrode 30 for alignment,
31 may be formed with the same width as the transparent electrode in the display area. As a result, the alignment pixels 27 can be easily formed in the same step as the information display pixels 11.

Next, the liquid crystal display element 26 having the alignment pixels 27 formed therein is incorporated into the housing 2.

At this time, the buffer member 21 is attached to a portion of the liquid crystal display element 26 corresponding to the outside of the display area 6 as in the conventional case. In the present embodiment, this attachment is performed. As the alignment method in this case, a liquid crystal drive voltage is applied to a predetermined alignment pixel 27 via a terminal portion 27a corresponding to this alignment pixel 27, thereby performing alignment The pixel 27 for lighting is turned on in a shape along the end of the buffer member 21.

As a result, the alignment mark 28 consisting of the alignment pixels 27 in the lit state is displayed on the portion of the liquid crystal display element 26 corresponding to the outside of the display area 6.

At this time, for example, as shown in FIG. 2, it is preferable to display two parallel line segments having a predetermined gap as the alignment mark 28.
In this case, since the end sides of the cushioning member 21 can be simply and properly positioned between the two lighted lines, the cushioning member 21 can be aligned more quickly and accurately.

Then, the buffer member 21 is attached on the liquid crystal display element 26 along the alignment mark 28.

After the cushioning member 21 is attached, the cushioning member 21 is sandwiched between the liquid crystal display element 26 and the casing 2, and the liquid crystal display element 26 is incorporated in the casing 2. At this time, if an adhesive material such as a double-sided adhesive tape is provided above and below the buffer member 21, the liquid crystal display element 26 and the housing 2 will be bonded to each other via the buffer member 21.

As a result, the buffer member 21 properly prevents the liquid crystal display element 26 from rattling, and the liquid crystal display element 26 is incorporated into the housing 2 to form the liquid crystal display device 25.

Therefore, according to the present embodiment, the display area 6
By illuminating the alignment pixels 27 formed on the outside of the, the alignment mark 28 for attaching the cushioning member 21 is displayed, and the cushioning member 21 can be attached through the alignment mark 28. Therefore, the buffer member 21 can be easily and accurately aligned without requiring any special means separate from the liquid crystal display element 26 for aligning the buffer member 21, thus reducing the cost and manufacturing. It is possible to improve efficiency.

Further, such a positioning pixel 27 is used.
Can be easily formed by the same process as the pixel 11 formed in the display region 6, so that the alignment can be performed more easily.

The present invention is not limited to the above-mentioned embodiment, but can be variously modified if necessary.

For example, the liquid crystal 8 may be a liquid crystal having a memory property that can maintain a lighting state even when no voltage is applied, such as a chiral nematic liquid crystal ferroelectric liquid crystal.

In this case, after the liquid crystal display element 26 is formed, the terminal portion 27a is attached to the predetermined alignment pixel 27.
If the liquid crystal drive voltage is once applied via the light source and is turned on, it is not necessary to continue to apply the liquid crystal drive voltage to the alignment pixel 27 when aligning the buffer member 21.

Therefore, it is not necessary to keep a special flexible wiring substrate fixed to the terminal portion 27a for continuously applying the liquid crystal drive voltage to the alignment pixel 27.
The handling is simplified and the cushioning member 21 can be attached more smoothly.

Further, although the buffer member 21 is arranged on the polarizing plate 15 in the figure, the present invention is not limited to this form, and the buffer member 21 may be arranged on the outermost surface constituting the liquid crystal display element. . For example, in the case of a liquid crystal display device in which a chiral nematic liquid crystal is enclosed, a polarizing plate is not necessary, so the buffer member 21 is provided on the outer surface of the transparent substrate 4.

Further, the shape of the alignment mark 28 may be appropriately changed according to the shape of the end of the cushioning member 21 to be attached.

[0048]

As described above, according to the method of manufacturing a liquid crystal display device according to claim 1 of the present invention, the manufacturing cost of the liquid crystal display device can be reduced and the manufacturing efficiency can be improved. it can.

According to the manufacturing method of the liquid crystal display device of the second aspect, in addition to the effect of the manufacturing method of the liquid crystal display device of the first aspect, the buffer member can be aligned more easily and with high accuracy. it can.

According to the manufacturing method of the liquid crystal display device of claim 3, in addition to the effect of the manufacturing method of the liquid crystal display device of claim 1 or 2, the manufacturing efficiency of the liquid crystal display device is further improved. be able to.

[Brief description of drawings]

FIG. 1 is a plan view showing a formation state of alignment pixels in an embodiment of a method of manufacturing a liquid crystal display device according to the present invention.

FIG. 2 is an enlarged plan view showing an example of a lighting state of the alignment pixel in the embodiment of the method of manufacturing the liquid crystal display device according to the present invention.

FIG. 3 is a schematic sectional view showing a basic configuration of a liquid crystal display device that has been conventionally used.

FIG. 4 is a schematic plan view showing a configuration of a pixel in a conventionally used liquid crystal display device.

[Explanation of symbols]

2 housing 4,5 transparent substrate 6 display area 7 seal 8 liquid crystal 9, 10, 30, 31 Transparent electrode 11 pixels 15,16 Polarizer 21 Buffer member 25 Liquid Crystal Display 26 Liquid crystal display elements 27 Alignment pixels 28 Alignment mark

Claims (3)

[Claims] 1. Two transparent substrates are bonded to each other via a frame-shaped seal, liquid crystals are enclosed in a space surrounded by the transparent substrates and the seals, and both inner surfaces of the transparent substrates facing each other are provided. In the display area, a pair of stripe-shaped transparent electrodes for applying a liquid crystal driving voltage to the liquid crystal are crossed with each other, and a liquid crystal display element is formed by forming pixels composed of intersections of both transparent electrodes, After disposing a cushioning member at a portion of the liquid crystal display element corresponding to the outside of the display area, the liquid crystal display element is mounted on the casing while sandwiching the cushioning member between the liquid crystal display element and the casing. In the method of manufacturing a liquid crystal display device to be incorporated, an alignment pixel composed of a pair of stripe-shaped transparent electrodes intersecting each other is formed on the inner surfaces of the both transparent substrates, outside the display area. Method of manufacturing a liquid crystal display device which displays the alignment mark of the buffer member, characterized by disposing the buffer member through the positioning mark by turning on the pixel for alignment. 2. The alignment mark is displayed in the shape of a double line segment having a predetermined gap from each other, and the cushioning member is arranged in a state in which the ends of the cushioning member are aligned in the gap. The method of manufacturing a liquid crystal display device according to claim 1, wherein the liquid crystal display device is manufactured. 3. The method of manufacturing a liquid crystal display device according to claim 1, wherein the liquid crystal is a liquid crystal having a memory property that can maintain a lighting state even when no voltage is applied. .