JPH08179332A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To provide a small-sized liquid crystal display device having an excellent display grade. CONSTITUTION: Transparent electrodes and a surfactant layer are formed on a translucent substrate 2 and thereafter, an oriented film 5 is formed thereon to constitute one substrate member 6. The oriented film 5 is formed in a region 15a which is a liquid crystal injection region 15, an injection hole region 16 and a region 15b which is a part of the region where an adhesive member 7 is formed. On the other hand, the spaces formed by the adhesive member 7 applied on the oriented film 5 of the substrate member 6, the oriented film 5 and the oriented film of the other substrate member are made into the space 18 to constitute a liquid crystal layer by injection of the liquid crystals and the injection hole 17 for injecting the liquid crystals into the space 18 in communication with the space 18. The width D of the adhesive member 7 and the width (d) of the region 15b superposed on the adhesive member 7 and the oriented film 5 are selected in a range of D>d>=0. A pair of the substrate members are stuck to each other and the liquid crystals are injected therebetween from the injection hole 17 and thereafter, the inlet of the injection hole 17 is sealed by a sealing member 13.

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 device having excellent display quality, and more particularly to a relatively small liquid crystal display device used in a viewfinder or a projection device of a video camera.

[0002]

2. Description of the Related Art A liquid crystal display device includes a pair of substrate members, a liquid crystal layer interposed between the substrate members, a liquid crystal layer side surface of the pair of substrate members, and a space into which liquid crystal is to be injected and an injection for liquid crystal injection. And a sealing member for sealing the injection hole.

FIG. 10 is a plan view showing step by step a method of manufacturing a conventional liquid crystal display device 51, and FIG. 11 is a sectional view thereof. The liquid crystal display device 51 includes a pair of substrate members 56 and 6
2, a liquid crystal layer 64, an adhesive member 57, and a sealing member 63. The pair of substrate members 56 and 62 includes the transparent substrates 52 and 58, the transparent electrodes 53 and 59, and the surfactant layer 5.
4, 60 and alignment films 55, 61, respectively. The translucent substrate 5 shown in FIGS. 10 (1) and 11 (1), which has at least insulation and is made of, for example, glass.
2 on one surface 52a of FIG.
As shown in (2), a transparent electrode 53 for display is formed, and a surfactant such as a silane coupling agent is further applied to form a surfactant layer 54. The surfactant layer 54 is provided to improve the adhesion between the translucent substrate 52 and the alignment film 55 and the adhesive member 57 described later.

Next, as shown in FIGS. 10 (3) and 11 (3), an alignment film 55 is formed. Alignment film 55
Is formed by, for example, forming a polyimide resin on the entire surface of the surface of the surfactant layer 54 by a spin coating method and subjecting the surface to an alignment treatment such as a rubbing treatment. In this way, the one-sided substrate member 56 is formed.

On the other hand, on the alignment film 55 of the substrate member 56, an adhesive member 57 is applied by a screen printing method as shown in FIGS. 10 (4) and 11 (4). A region inside the substrate on the surface of the alignment film 55 surrounded by the adhesive member 57 communicates with a region forming a space into which liquid crystal is injected, that is, the liquid crystal injection region 65 and the space into which the liquid crystal is injected, and Is an area for forming an injection hole for injecting into the space, that is, an injection hole area 66. further,
As shown in FIG. 10 (5), the other substrate member 62, which is formed in the same manner as the one substrate member 56 and has the translucent substrate 58, the transparent electrode 59, the surfactant layer 60 and the alignment film 61, is formed as shown in FIG. The adhesive member 57 is applied and then bonded to the one-side substrate member 56. At this time, one substrate member 56
The alignment film 55 and the alignment film 61 of the other substrate member 62 are attached so as to face each other. As a result, a space into which the liquid crystal is to be injected and an injection hole are formed.

The liquid crystal is injected from the injection hole into the space into which the liquid crystal should be injected, thereby forming the liquid crystal layer 64. When the injection of the liquid crystal is completed, the inlet of the injection hole is sealed by the sealing member 63. In this way, FIG.
Liquid crystal display device 51 shown in (6) and FIG. 11 (5)
Is completed.

FIG. 12 is a plan view showing stepwise a method of manufacturing another conventional liquid crystal display device 69, and FIG. 13 is a sectional view thereof. The liquid crystal display device 69 is the liquid crystal display device 5.
Since it is constructed almost in the same manner as 1, the same components are designated by the same reference numerals. The liquid crystal display device 69 is configured to include a pair of substrate members 67 and 68 instead of the pair of substrate members 56 and 62. A pair of substrate members 67,
68 denotes an alignment film 70, instead of the alignment films 55, 61.
71 respectively.

On one surface 52a of the transparent substrate 52, the transparent electrode 53 and the surfactant layer 54 are formed in the same manner as described above.
Is formed. Next, FIG. 12 (1) and FIG. 13 (1)
The alignment film 70 is formed as shown in FIG. Alignment film 70
Like the alignment film 55, is formed of, for example, a polyimide resin, and is a region that forms a space into which liquid crystal is to be injected by the relief printing method, that is, a liquid crystal injection region 65a and an adhesive member 57 described later. It is formed by forming a region 65b where the portions overlap with each other, and performing an alignment treatment such as a rubbing treatment on the surface thereof. In this way, the one-sided substrate member 67 is created.

On the other hand, as shown in FIGS. 12 (2) and 13 (2), the adhesive member 57 is applied on the surface of the surfactant layer 54 and the alignment film 70 of the substrate member 67 by the screen printing method. The adhesive member 57 is formed so as to substantially surround the alignment film 70 and partially overlap the alignment film 70 as shown in the drawing, that is, only the region 65b excluding the injection hole region. As described above, an example of forming the adhesive member 57 by partially overlapping the alignment film 70 is disclosed in JP-A-63-63.
No. 8633 is disclosed. The adhesive member 5
Alignment film 70 and surfactant layer 54 surrounded by 7
The inner region of the substrate is a liquid crystal injection region 65a similar to that described above.
And the injection hole region 66.

Further, the other substrate member 68 is formed in the same manner as the one substrate member 67 and has the transparent substrate 58, the transparent electrode 59, the surfactant layer 60 and the alignment film 71.
However, it is attached to the one side substrate member 67 to which the adhesive member 57 is applied. At this time, the alignment film 70 of the one substrate member 67 and the alignment film 71 of the other substrate member 68 are bonded so as to face each other. As a result, a space into which the liquid crystal is to be injected and an injection hole are formed. The liquid crystal is injected into the space into which the liquid crystal is to be injected to form the liquid crystal layer 64, and when the injection of the liquid crystal is completed, the inlet of the injection hole is sealed by the sealing member 63. In this way, FIG. 12 (3) and FIG.
The liquid crystal display device 69 shown in (3) is completed.

[0011]

The liquid crystal display device is used for a relatively large display device such as a portable television or a word processor, and also for a viewfinder of a video camera or a projection device. There is an application to a small-sized display device, and in the latter, it is desired that the ratio of the display area to the total area of the device parallel to the display surface of the liquid crystal display device is large. In such a small-sized liquid crystal display device, the deterioration of the display quality due to the moisture absorption of the alignment film as described later and the deterioration of the display quality due to the mixing of impurities during the liquid crystal injection are remarkable as compared with the large-sized liquid crystal display device. Therefore, it is necessary to take measures to improve the display quality.

As shown in FIGS. 10 and 11, when the alignment films 55 and 61 are formed on the entire surfaces of the surfactant layers 54 and 60, the one substrate member 56 and the other substrate member 62 are bonded together. The adhesive member 57 of the alignment films 55, 61
It is provided in contact with. In this case, since the adhesiveness between the alignment film 55 and the adhesive member 57 is lower than the adhesiveness between the surfactant layer 54 and the adhesive member 57, peeling occurs between the alignment film 55 and the adhesive member 57. It is easy to occur. On the other hand, also on the substrate member 62 side, peeling is likely to occur between the alignment film 61 and the adhesive member 57.

Further, the polyimide resin used as the alignment films 55 and 61 has a relatively high hygroscopicity, and the alignment films formed in areas other than the liquid crystal injection region 65 and the injection hole region 66 that come into contact with the atmosphere absorb moisture in the atmosphere. Absorb moisture. If the absorbed moisture enters the liquid crystal layer 64, the electric resistance value of the liquid crystal material is lowered, and the liquid crystal alignment defect is caused to deteriorate the display quality. In order to prevent such deterioration of display quality,
For example, the liquid crystal display device 5 in which the width of the adhesive member 57 is widened
It is necessary to take measures such as molding the periphery of No. 1 with a silicone resin having excellent moisture resistance and the like.
It takes time to create 1. Moreover, such a measure is disadvantageous for achieving the miniaturization.

Further, the polyimide resin is a resin having an excellent insulating property, and when the alignment films 55 and 61 are provided on the entire surface of the surfactant layers 54 and 60, a voltage for displaying is applied to the transparent electrodes 53 and 59. In order to apply the voltage, it is necessary to remove the alignment films 55 and 61 on the peripheral edges of the electrodes 53 and 59. Therefore, it takes time to create the liquid crystal display device 51.

On the other hand, as shown in FIGS. 12 and 13, when the alignment films 70 and 71 are formed only in predetermined regions, the alignment films 70 and 71 do not come into contact with the atmosphere, and thus the alignment films 70 and 71 are formed. It is possible to prevent moisture absorption of the polyimide resin used as the adhesive member 57 and the alignment film 7
Since it only overlaps with a portion of 0, 71 and has a portion that comes into contact with the surfactant layers 54, 60, the adhesion is improved and peeling is less likely to occur.

However, focusing on the liquid crystal injection hole,
Since the alignment film 70 is not completely formed in the injection hole region 66, the liquid crystal injected during the liquid crystal injection comes into contact with the surfactant layer 54, which causes a reduction in the electric resistance value of the liquid crystal material. Alignment failure of liquid crystal occurs and display quality is degraded. Specifically, at the time of baking after applying the polyimide resin as the surfactant (baking temperature: 180 ° C. to 250 ° C.)
It is considered that the liquid crystal material decomposes at (° C.), and the thermal decomposition product generated at this time lowers the electric resistance value of the liquid crystal material.
It has been confirmed that the alignment defect of the liquid crystal is only in the vicinity of the injection hole immediately after the liquid crystal display device 69 is manufactured, but progresses toward the vicinity of the center of the display area after a long time.

In practice, in order to ensure reliability, the display area is set with a certain length of margin from the liquid crystal layer side end of the adhesive member 57 toward the inside of the liquid crystal layer. In particular, in consideration of the liquid crystal alignment defect as described above, the length L1 from the end of the adhesive member 57 on the side where the injection hole is provided on the liquid crystal injection region 65 side to the actual display region, and the injection hole are The length L2 from the end of the adhesive member 57 on the side not provided to the liquid crystal injection region 65 to the actual display region is set so that L1> L2. Although it depends on the size of the liquid crystal display device, for example, the length L1 is 0.3 mm to
It is set to be larger by about 2 mm. Therefore,
The liquid crystal display device cannot be downsized in order to secure the reliability of the display quality. In particular, in a relatively small liquid crystal display device used in a viewfinder or a projection device of a video camera, the effect is great even if the size is a little small. It is desired to lose it.

An object of the present invention is to provide a small-sized liquid crystal display device having excellent display quality.

[0019]

According to the present invention, a pair of substrate members, at least one of which is transparent, a liquid crystal layer interposed between the pair of substrate members, and a pair of substrate members are provided. , By the liquid crystal layer side surface of the pair of substrate members,
A space where liquid crystal is to be injected and an adhesive member that forms an injection hole communicating with the space, and a sealing member that seals the injection hole, the pair of substrate members, an insulating substrate, A liquid crystal display device having at least a display electrode formed on the surface of the insulating substrate on the liquid crystal layer side and an alignment film formed on the insulating substrate on which the display electrode is formed so as to be in contact with the liquid crystal layer. In, the alignment film,
At least a first region in which a space for injecting liquid crystal is formed by an adhesive member and a second region in which an injection hole is formed by the adhesive member are provided on the insulating substrate on which the display electrodes are formed. A liquid crystal display device characterized by the above. According to the invention, the liquid crystal layer and the adhesive member are arranged between the pair of substrate members arranged so as to face each other. The pair of substrate members are formed so as to be in contact with the liquid crystal layer on the insulating substrate, the display electrodes formed on the surface of the insulating substrate on the liquid crystal layer side, and the insulating substrate on which the display electrodes are formed. And an alignment film, and at least one of them has a light-transmitting property. The pair of substrate members are arranged so that the alignment films face each other. A space into which the liquid crystal is to be injected and an injection hole communicating with the space are formed by the surface of the alignment film, which is the liquid crystal layer side surface of the pair of substrate members, and the adhesive member. The inlet of the injection hole is sealed by a sealing member after injecting liquid crystal into the space. The alignment film includes a first region on the insulating substrate on which the display electrodes are formed, a first region in which a space for injecting liquid crystal is formed by an adhesive member, and a second region in which an injection hole communicating with the space is formed. It is provided in the area. A space into which the liquid crystal should be injected and an injection hole are formed by the surface of the alignment film and the adhesive member, and the adhesive member comes into contact with a surface having a relatively high adhesiveness other than the alignment film. Therefore, as compared with the case where an alignment film is formed on the entire surface of the substrate by the spin coating method and the adhesive member is provided on the alignment film, the adhesion between the adhesive member and the substrate member is improved. Further, since the alignment film does not come into contact with the air, it is possible to prevent the electric resistance value of the liquid crystal material from lowering due to the absorption of moisture in the air. In addition, a second forming an injection hole
Since the alignment film is formed also in the region, impurities that reduce the electric resistance value of the liquid crystal are not mixed into the liquid crystal at the time of injecting the liquid crystal, and alignment failure of the liquid crystal does not occur. In such a liquid crystal display device, it is not necessary to consider the deterioration of the display quality due to the mixing of impurities, and therefore the liquid crystal display device can be downsized. That is, the actual display area is set at a predetermined distance from the liquid crystal layer side end of the adhesive member toward the inside of the substrate to ensure reliability,
Especially when considering the deterioration of display quality due to the mixing of impurities, the length from the adhesive member on the side where the injection holes are provided to the display area is from the adhesive member on the side where the injection holes are not provided to the display area. Chosen to be longer than. However, in the present invention, since it is not necessary to consider the deterioration of the display quality due to the mixing of impurities, it is possible to make the length from the adhesive member to the display region relatively short and equal in all directions. Therefore, it is possible to provide a small-sized liquid crystal display device having excellent display quality and high reliability.

Further, according to the present invention, a pair of substrate members, at least one of which has a translucency, a liquid crystal layer interposed between the pair of substrate members, and a pair of substrate members interposed between the pair of substrate members. The liquid crystal layer side surface of the substrate includes an adhesive member that forms a space into which liquid crystal is to be injected and an injection hole that communicates with the space, and a sealing member that seals the injection hole. The member includes an insulating substrate, a display electrode formed on the liquid crystal layer side surface of the insulating substrate, and an alignment film formed on the insulating substrate on which the display electrode is formed so as to be in contact with the liquid crystal layer. In the liquid crystal display device having at least each of the above, the alignment film has a first region on the insulating substrate on which the display electrodes are formed, a first region in which a space for injecting liquid crystal is formed by the adhesive member, and an adhesive member. By Entry apertures a liquid crystal display device, characterized in that provided in the third region second region, and the adhesive member is a part of the area to be arranged is formed. According to the present invention, the alignment film is formed on at least the insulating substrate on which the display electrodes are formed, a first region in which a space for injecting liquid crystal is formed by an adhesive member, and an injection hole communicating with the space. Is provided in a second region in which is formed, and a third region that is a part of a region in which the adhesive member is arranged. A space into which the liquid crystal should be injected and an injection hole are formed by the surface of the alignment film and the adhesive member, and the adhesive member comes into contact with a surface having a relatively high adhesiveness other than the alignment film. Therefore,
The adhesiveness between the adhesive member and the substrate member is improved as compared with the case where the alignment film is formed on the entire surface and the adhesive member is provided thereon. In addition, the alignment film does not come into contact with the atmosphere, and it is possible to prevent a decrease in the electric resistance value of the liquid crystal material due to the absorption of moisture in the atmosphere. Further, an alignment film is formed also in the second region where the injection hole is formed, impurities that reduce the electric resistance value are not mixed in the liquid crystal layer, and liquid crystal alignment failure does not occur. Also in such a liquid crystal display device, it is not necessary to consider the deterioration of the display quality due to the mixing of impurities, so that the liquid crystal display device can be downsized. Therefore, it is possible to provide a small-sized liquid crystal display device having excellent display quality and high reliability.

Further, according to the present invention, the width D of the region where the adhesive member is arranged and the width d of the third region where the adhesive member and the alignment film overlap each other are selected in the range of D>d> 0. Characterize. According to the invention, the adhesive member and the alignment film are provided so as to partially overlap each other, and the width D of the region where the adhesive member is arranged and the width of the third region where the adhesive member and the alignment film overlap each other. d is selected in the range of D>d> 0. A space into which the liquid crystal is to be injected and an injection hole communicating with the space are formed by the alignment film surface and the adhesive member, and the width D and the width d are formed.
Is selected in the range of D>d> 0, so that the adhesive member comes into contact with the surface having relatively high adhesiveness other than the alignment film at least partially. Therefore, the adhesion between the adhesive member and the substrate member is improved. Further, it is possible to prevent the electric resistance value of the liquid crystal material from lowering due to the absorption of moisture in the atmosphere. Further, since the alignment film is formed also on the surface forming the injection hole, impurities that reduce the electric resistance of the liquid crystal are not mixed into the liquid crystal at the time of liquid crystal injection, and the liquid crystal is not defective in alignment. Therefore, it is possible to provide a small-sized liquid crystal display device having excellent display quality and high reliability.

Further, in the present invention, the shape of the first region is selected to be a rectangle, the shape of the second region is selected to be a rectangle smaller than the first region, and one side of the second region of the rectangle is the first of the rectangle. It is characterized by being in contact with one side of the region. According to the invention, the alignment film is formed in at least the above-described rectangular first region and second region. Even when the alignment film is formed in such a region, the above-described action improves the adhesion between the adhesive member and the substrate member, prevents the decrease in the electric resistance of the liquid crystal material, and prevents the alignment of the liquid crystal. No defects will occur. Therefore, it is possible to provide a small-sized liquid crystal display device having excellent display quality and high reliability.

Further, according to the present invention, at least a fourth region protruding from the second region toward the outside of the substrate member on the insulating substrate on which the display electrodes are formed is covered with the sealing member. It is characterized by According to the invention, since the fourth region is covered with the sealing member, even if the alignment film is formed in the fourth region, the alignment film is covered with the sealing member, and the alignment film absorbs moisture. It is possible to further prevent a decrease in the electric resistance value of the liquid crystal material.

Further, the present invention is characterized in that the alignment film is formed on a surfactant layer. According to the present invention, the alignment film is formed on the surfactant layer. The surfactant layer improves and improves the adhesion between the alignment film and the adhesive member and the substrate on which these members are formed. When such a surfactant is mixed in the liquid crystal, it lowers the electric resistance value of the liquid crystal material. However, in the present invention, since the alignment film is formed on the surface forming the injection hole, the surface active agent in the liquid crystal is The agent is not mixed, and the reduction of the electric resistance value can be prevented.

[0025]

1 is a plan view showing stepwise a method of producing a liquid crystal display device 1 according to an embodiment of the present invention, and FIG. 2 is a sectional view thereof. The liquid crystal display device 1 includes a pair of substrate members 6 and 12, a liquid crystal layer 14, an adhesive member 7, and a sealing member 13. A pair of substrate members 6,
Reference numeral 12 has translucent substrates 2 and 8, transparent electrodes 3 and 9, surfactant layers 4 and 10, and alignment films 5 and 11, respectively.
For example, when the liquid crystal display device 1 is an active matrix drive type liquid crystal display device that performs color display, one of the pair of substrate members 6 and 12 is an amorphous silicon TFT (thin film transistor) element, or polysilicon. TFT element or MIM (metal-insulating film-
It has a switching element such as a (metal) element, and the other substrate member has a color filter. Further, the transparent electrode of the substrate member on the side having the switching element serves as a pixel electrode provided for each pixel, and the transparent electrode on the side having the color filter serves as a common electrode.

1 (2) and FIG. 2 are formed on one surface 2a of the light-transmissive substrate 2 having at least the insulating property shown in FIGS. 1 (1) and 2 (1) and made of, for example, glass. 2 (2), a transparent electrode 3 for display is formed, and a surfactant such as a silane coupling agent is further applied to form a surfactant layer 4. Surfactant layer 4
Is an alignment film 5 and an adhesive member 7 and a translucent substrate 2 described later.
It is provided to improve the adhesion with. For example, T
When the FT element is provided, Si is formed on the surface of the transparent substrate 2.
Inorganic substances such as N, SiO, and ITO are exposed. These have low adhesion to the alignment film material such as polyimide. A functional group such as a vinyl group or an alkoxy group that easily binds to polyimide is present at one end of the silane coupling agent molecule as the surfactant layer 4, and an inorganic substance such as an alkoxy group or a halogen is present at the other end. There are functional groups that are compatible with. Therefore, the adhesion is improved.

Next, an alignment film 5 is formed as shown in FIGS. 1 (3) and 2 (3). The alignment film 5 is realized by, for example, a polyimide resin, and the polyimide resin is applied by a letterpress printing method described later. Alignment film 5
Is formed in at least a first region 15a forming a space into which liquid crystal is injected, that is, a liquid crystal injection region 15, and a second region 16 forming an injection hole communicating with the space, that is, an injection hole region 16. . Further, for example, the third region 1 which is a part of the region where the adhesive member 7 described later is formed.
It is also formed on 5b. An alignment treatment such as a rubbing treatment is applied to the surface of the resin film such as polyimide applied by the relief printing method to form the alignment film 5.

Further, preferably, the shape of the first region 15a is selected to be rectangular, and the shape of the second region 16 is the first region 15.
A rectangle smaller than a is selected. One side 16a of the rectangular second area 16 is in contact with one side 15c of the rectangular first area 15a. In this way, the first substrate member 6 is formed.

On the other hand, as shown in FIGS. 1 (4) and 2 (4), on the surface of the surfactant layer 4 and the alignment film 5 of the substrate member 6, for example, an epoxy-based ultraviolet ray mixed with a glass fiber of 5 μm is used. An adhesive member 7 made of a curable resin or the like is applied by a screen printing method. Adhesive member 7
Are formed so as to substantially surround the alignment film 5, and the alignment film 5
In consideration of the alignment accuracy of printing of the adhesive member 7, it is formed so as to overlap a part of the alignment film 5 as shown in the figure. When it is not necessary to consider the positional accuracy, they may be formed so as not to overlap. The area inside the substrate surrounded by the adhesive member 7 communicates with the first area 15a forming a space into which the liquid crystal is injected, that is, the liquid crystal injection area 15 and the space into which the liquid crystal is to be injected. Is a second region 16 forming an injection hole for injecting into the space, that is, an injection hole region 16.

Further, the transparent substrate 8, the transparent electrode 9 and the surfactant layer 1 are prepared in the same manner as the one-sided substrate member 6.
0 and the other substrate member 12 having the alignment film 11 is shown in FIG.
As shown in (5), the adhesive member 7 is attached to the one-side substrate member 6 coated with the adhesive member 7. At this time, the alignment film 5 of the one substrate member 6 and the alignment film 11 of the other substrate member 12 are bonded so as to face each other. In addition, conductive carbon is applied to the end surface of the other substrate member 12 using a dispenser or the like. In this way, the pair of substrate members 6 and 12 are attached to each other,
The adhesive member 7 is hardened by applying pressure so that the intervals between the two are uniform. As a result, a space 18 into which the liquid crystal is to be injected and an injection hole 17 are formed.

Liquid crystal is injected from the injection hole 17 into the space 18 into which the liquid crystal should be injected, whereby the liquid crystal layer 1 is formed.
4 is formed. When the injection of the liquid crystal is completed, the inlet of the injection hole 17 is sealed by the sealing member 13 made of, for example, an epoxy-based ultraviolet curing resin. That is, the side 16b of the second region 16 that faces the side 16a.
The fourth region 19 protruding from the substrate member 6 and 12 toward the outside is covered with at least the sealing member 13. In this way, the liquid crystal display device 1 shown in FIGS. 1 (6) and 2 (5) is completed.

In this embodiment, the one substrate member 6 is larger than the other substrate member 12. Therefore, the fourth area 1
9 is formed only on the first substrate member 6, and at least the fourth region 19 is covered with the sealing member 13.

FIG. 3 is a plan view showing a relief printing plate lower portion 21 used when a polyimide resin is applied by the relief printing method, and FIG. 4 is a sectional view for explaining the relief printing method. The relief plate bottom 21 is realized by, for example, a metal plate, and on one surface thereof, an alignment film pattern 22 having the same shape as the alignment films 5 and 11 is formed as a projection by, for example, a photolithography method. The alignment film pattern 22 is formed parallel to, for example, the longitudinal direction of the rectangular metal plate used and symmetrical with respect to a center line 35 that bisects the metal plate surface. During letterpress printing, the letterpress bottom 21 is conveyed in a direction 23 parallel to the center line 35, and, for example, a pattern of an alignment film for forming the injection holes is arranged on the downstream side in the conveying direction.

The letterpress bottom 21 as described above is attached to the surface of a roller-shaped plate cylinder 30. At the time of letterpress printing, the alignment film material 27 is supplied from the dispenser 26 at a predetermined speed, and the supply amount of the alignment film material 27 is further adjusted by the doctor roll 28 and the anilox roll 29. The surface of the doctor roll 28 and the surface of the anilox roll 29 are provided so as to be in contact with each other, and rotate in opposite directions 31 and 32, respectively. Doctor roll 2
8 and the surface of the alignment film pattern 22, which is the convex portion of the letterpress lower plate 21 attached to the plate cylinder 30, are provided in contact with each other, and the doctor roll 28 and the plate cylinder 30 are in opposite directions. 31 and 33 respectively rotate. The alignment film material 27 adjusted in the supply amount and attached to the doctor roll 28 is transferred to the surface of the alignment film pattern 22.

The letterpress bottom 2 attached to the plate cylinder 30
The surface of the first alignment film pattern 22 and the surface of the substrate 25, which is placed on the stage 24 and on which the alignment film is to be formed, are arranged in contact with each other, and the plate cylinder 30 rotates in the rotation direction 33. Then, the stage 24 rotates in the rotation direction 3 of the plate cylinder 30.
By moving the substrate 25 in the direction 34 along the direction 3 and transporting the substrate 25 in the direction 34, the alignment film material 27 attached to the surface of the alignment film pattern 22 under the relief plate 21 is transferred to the substrate 25.
Is transferred to the surface of. After the alignment film material 27 is applied in this manner, alignment processing is performed to form the alignment films 5 and 11.

In this embodiment, the orientation film pattern to be the orientation films 5 and 11 is formed by using the relief printing plate 21 as shown in FIG. Since the position of the relief lower plate 21 attached to the plate cylinder 30 and the position of the substrate 25 placed on the stage 24 are predetermined, the orientations symmetrically arranged with respect to the center line 35 as described above. When the alignment films 5 and 11 are formed together using the relief printing plate 21 having the film pattern 22, the injection hole 17 to be formed is arranged at the center of the side on which the injection hole 17 is provided. Therefore, the same relief printing plate 21 is used to form the alignment films 5 on the different substrate sides.
11 can be formed, and the replacement work under the relief plate required when the injection hole 17 is provided at a position deviated from the center is unnecessary, and the production efficiency is improved.

FIG. 5 is an enlarged plan view showing the injection hole 17, and FIG. 6 is a sectional view taken along the section line I--I. In the present invention, the adhesive member 7 and the alignment films 5 and 11 may be provided so as to partially overlap with each other, or may be provided so as not to overlap with each other. Therefore, the width of the adhesive member 7 is set to D, and the alignment with the adhesive member 7 is performed. Third region 15 overlapping with film 5 or alignment film 11
If the width of b is d, the range of D> d ≧ 0 is selected. Originally, the width d = 0 is preferable, but when the polyimide resin to be the alignment films 5 and 11 is applied by the relief printing method as described above and the adhesive member 7 is applied by the screen printing method, the alignment accuracy of both is improved. It is preferable to have some margin. Therefore, as described above, D> d ≧
A range of 0 is chosen. For example, the width D is 1.2 mm and the width d is 0.3 mm. In this case, when the alignment accuracy is ± 0.05 mm, the width d is in the range of 0.2 mm to 0.4 mm.

The fourth region 19 is covered with the sealing member 13 as described above. Therefore, in consideration of the alignment accuracy as described above, as shown in FIG. 5, for example, in the fourth region 19 protruding outward from the injection hole region 16 of the one alignment film 5 toward the outside of the substrate member 6. Even if the alignment film 5 is formed, the alignment film portion 5 a is covered with the sealing member 13 that seals the injection hole 17. Therefore, the alignment film 5 does not come into contact with the atmosphere, and it is possible to prevent a decrease in the electric resistance value of the liquid crystal due to moisture absorption.

FIG. 7 shows a display area 37, which is actually set.
FIG. 43 is a plan view showing 43. FIG. 7A shows the liquid crystal display device 1 of this embodiment, and FIG. 7B shows the conventional liquid crystal display device 38.
Indicates. Although the conventional liquid crystal display device 38 has an alignment film formed by a relief printing method, the alignment film is not provided in the region 16 where the injection hole is formed. The display area is set in the space into which the liquid crystal should be injected, with a predetermined length of margin from the liquid crystal layer side end of the adhesive member toward the inside of the liquid crystal layer. In the case of this embodiment, from the liquid crystal layer side end portion of the adhesive member 7 on the side where the injection hole 17 is provided to the display region 3
The length L1 up to 7 can be the same as the length L2 to L4 from the liquid crystal layer side end of the adhesive member 7 on the side where the injection hole 17 is not provided to the display region 37. For example, the lengths L1 to L4 are both selected to be 0.05 mm or more.

On the other hand, in the case of the conventional liquid crystal display device 38,
The length L1 is selected to be larger than the lengths L2 to L4 in order to prevent the influence of impurities such as a surfactant mixed in the liquid crystal at the injection hole 44 portion at the time of injecting the liquid crystal. Therefore, the liquid crystal display device 38 becomes relatively large.

In the case of this embodiment, the length A1 in the direction perpendicular to the side on the side where the injection hole 17 is provided, which is the length between the liquid crystal layer side ends of the adhesive member 7, is, for example, 15.8 mm. To
The length A2 of the display area 37 in the same direction is, for example, 1
The length B1 in the direction parallel to the side on the side where the injection hole 17 is provided, which is the length between the liquid crystal layer side ends of the adhesive member 7, is 4.2 mm, for example, 12.0 mm. The length B2 of the directional display area 37 is selected to be 10.4 mm, for example. In the case of the conventional liquid crystal display device 38, for example, the length A1 is 16.3 mm and the length A2 is 1.
The length B1 is selected to 4.2 mm, the length B1 is selected to 12.0 mm, and the length B2 is selected to 10.4 mm. In this way, the length A1 can be reduced by 0.5 mm while keeping the sizes of the display areas 37 and 43 the same. The length that can be reduced is about 3% with respect to A1 = 15.8 mm, and it is attempted to realize further miniaturization in a relatively small liquid crystal display device such as a liquid crystal display device for a viewfinder or a projection device. The effect of doing so is great.

Next, the results of evaluating the voltage holding ratio and the degree of alignment failure between the liquid crystal display device of this embodiment and the conventional liquid crystal display device will be described. 8 and 9 show
It is a top view which shows the electrode shape of the liquid crystal display device for evaluation used for this evaluation. In the drawings, the same components as those of the liquid crystal display device 1 are designated by the same reference numerals. The transparent electrodes 3a to 3c provided in place of the transparent electrode 3 on the one substrate member 6 side of the evaluation liquid crystal display device are liquid crystal injection directions S.
Are provided at three locations along the line. Transparent electrode 3a
To 3c are drawn out to one of the two substrate end portions orthogonal to the substrate end portion on the injection hole 17 side to the substrate end portion side. The transparent electrode 9a on the other substrate member 12 side is formed on almost the entire surface of the translucent substrate 8.

Table 1 shows the evaluation results of the voltage holding ratio.
In addition, Table 2 shows the length of the alignment defect region. The result of the liquid crystal display device in which the alignment film is formed in the liquid crystal injection region 15 and the injection hole region 16 as in the present embodiment is shown as (a), and as shown in FIGS.
5A and 5B show the result of the liquid crystal display device in which the alignment film was formed on the film No. 5 and a part of the injection hole region 16, and as shown in FIGS. 10 and 11, almost all of the transparent substrate on which the transparent electrode was formed was formed. The result of a liquid crystal display device having an alignment film formed on the entire surface is shown as (c). In addition, the results of the voltage holding ratios of the transparent electrodes 3a to 3c formed at different positions as described above are sequentially shown as, respectively. It should be noted that 60H for a device kept in an environment of 25 ° C
A rectangular wave voltage of z, ± 5 V was applied, and the voltage holding ratio immediately after preparation and the voltage holding ratio after aging driven for 500 hours in an environment of 60 ° C. and 95% RH were measured. further,
The length of the misalignment region is set to the adhesive members 7a to 7d shown in FIG.
The length from the end of the liquid crystal layer on the liquid crystal layer side is shown by w, x, y, and z, respectively. The adhesive members 7a to 7d are bonded to the side opposite to the injection hole 17, the side where the transparent electrodes 3a to 3c are drawn out, the side facing the side where the transparent electrodes 3a to 3c are drawn out, and the injection hole 17 side. Refers to the part of member 7.

[0044]

[Table 1]

[0045]

[Table 2]

Immediately after the formation, the transparent electrode 3c portion () closest to the injection hole 17 of the liquid crystal display device (b) having the alignment film formed in the liquid crystal injection region 15 and a part of the injection hole region 16 is the other portion. It can be seen that the voltage holding ratio is 99% or more, whereas it is as low as 98.5%. After aging, the liquid crystal injection region 15 and the injection hole region 16
Regarding the liquid crystal display device (a) in which an alignment film is formed on and,
Any of the transparent electrodes 3a to 3c holds 99% or more, while the other liquid crystal display devices (b) and (c) have the transparent electrodes 3a to 3c. A decrease in the voltage holding ratio is seen in any part.

Immediately after the preparation, in the liquid crystal display device (b), only the portion (z) of the adhesive member 7d on the injection hole 17 side has an alignment defect, and other than the adhesive member 7d of the device (b). Alignment failure did not occur in the portion (w, x, y) and the other liquid crystal display devices (a) and (c). After aging, for any of the liquid crystal display devices (a) to (c), any portion (w,
It can be seen that also in x, y, z), defective orientation occurs. However, it can be seen that the length of the region where the alignment defect occurs is the smallest in the liquid crystal display device (a).

As described above, in the liquid crystal display device of this embodiment, the drop in the voltage holding ratio is small, the degree of display failure is relatively small, and excellent display quality is obtained.

As described above, according to this embodiment, the adhesive member 7
Is provided so as to at least partially overlap with the surfactant layers 4 and 10 which have higher adhesiveness than the alignment films 5 and 11, and thus the adhesion is better than when the alignment film is provided on the entire surface by spin coating. The property is improved, and peeling between the adhesive member 7 and the alignment films 5 and 11 is eliminated. In addition, the alignment film 5,
Since No. 11 does not come into contact with the atmosphere, it is possible to prevent the electric resistance of the liquid crystal from decreasing due to the absorption of moisture in the atmosphere. Further, since the alignment films 5 and 11 are also formed in the injection hole region 16 where the injection hole 17 is formed, impurities such as a surfactant are mixed into the liquid crystal during the injection of the liquid crystal, and the electric resistance value of the liquid crystal is lowered. Will disappear.

Therefore, it is not necessary to consider the deterioration of the display quality due to the mixing of impurities, and the liquid crystal display device can be miniaturized. This is remarkable in a relatively small liquid crystal display device such as a viewfinder or a projection device. Further, if the liquid crystal display devices have the same size, it is possible to enlarge the display area.

In this embodiment, in order to improve the production efficiency by forming the alignment films 5 and 11 by using the same relief printing plate 21, the injection hole 17 is arranged at the center of the side on the injection hole side. However, in a relatively large-sized liquid crystal display device, it is possible to arrange the injection hole at a corner portion of the liquid crystal display device in order to minimize liquid crystal attached near the injection hole during liquid crystal injection. . By arranging the injection holes at the corners,
The area to be immersed in the liquid crystal bath filled with the liquid crystal to be injected can be reduced, and the adhesion amount can be reduced. Therefore, the work of removing the attached liquid crystal can be performed in a short time.
In the case of a small-sized liquid crystal display device, since it is small, the adhesion amount is basically small, and the work of removing the adhered liquid crystal can be performed in a short time. Therefore, the injection hole 17 should be arranged in the center as in this embodiment. Is possible.

The present invention is not limited to a small liquid crystal display device, but a large liquid crystal display device, in particular, a liquid crystal display device in which the ratio of the display area to the total area of the device parallel to the display surface of the liquid crystal display device is increased, that is, a display. Even when it is implemented in a liquid crystal display device in which the peripheral portion of the region is narrowed, the same effect is obtained and the display quality is improved.

[0053]

As described above, according to the present invention, since the adhesive member is provided so as to come into contact with the surface having a relatively high adhesiveness other than the alignment film, the adhesiveness of the adhesive member is improved. Further, since the alignment film does not come into contact with the atmosphere, it is possible to prevent the electric resistance of the liquid crystal from lowering due to moisture absorption. Furthermore, since the alignment film is also formed on the surface forming the injection hole, it is possible to prevent impurities such as a surfactant that lowers the electric resistance of the liquid crystal from being mixed into the liquid crystal when the liquid crystal is injected.

Therefore, it is not necessary to consider the deterioration of the display quality due to the mixing of impurities, and the distance between the adhesive member and the display area, which is provided in consideration of the deterioration of the display quality, can be reduced, and the liquid crystal display device. It is possible to reduce the size of.

Further, according to the present invention, the adhesive member is provided so that at least a part thereof comes into contact with the surface having a relatively high adhesiveness other than the alignment film. Therefore, similarly to the above, the adhesiveness of the adhesive member is improved, the decrease in the electric resistance value of the liquid crystal can be prevented, and the liquid crystal display device can be miniaturized.

Further, according to the present invention, the width d of the region where the adhesive member and the alignment film overlap each other is selected so that D>d> 0. Therefore, at least a part of the adhesive member comes into contact with the surface having relatively high adhesiveness, and the adhesiveness is improved.

Also according to the invention, the first and second regions are chosen to be rectangular. Even when the alignment film is formed in such a region, the adhesiveness of the adhesive member is improved.

Further, according to the present invention, even if, for example, an alignment film is formed in the fourth region projecting outward from the substrate member from the second region forming the injection hole, the alignment film is sealed. Since it is covered with the member, it is possible to prevent a decrease in the electric resistance value of the liquid crystal due to moisture absorption.

Further, according to the present invention, the alignment film is formed on the surfactant layer. This surfactant layer improves the adhesion between the alignment film and the adhesive member and the substrate on which these members are formed. Even if such a surfactant layer is provided, since the alignment film is formed on the surface forming the injection hole,
A surfactant is not mixed in the liquid crystal when the liquid crystal is injected.

[Brief description of drawings]

FIG. 1 is a plan view showing step by step a method of manufacturing a liquid crystal display device 1 according to an embodiment of the present invention.

2A to 2C are cross-sectional views showing a method of manufacturing the liquid crystal display device 1 step by step.

FIG. 3 is a plan view showing a letterpress bottom 21 used during letterpress printing.

FIG. 4 is a sectional view for explaining a relief printing method.

FIG. 5 is an enlarged plan view showing an injection hole 17.

FIG. 6 is a cross-sectional view of the injection hole 17 taken along the line I-I.

FIG. 7 is a plan view showing display areas 37 and 43.

FIG. 8 is a plan view showing an electrode shape of a liquid crystal display device used for evaluating the voltage holding ratio and the degree of alignment failure.

FIG. 9 is a plan view showing an electrode shape of a liquid crystal display device used for evaluating a voltage holding ratio and a degree of alignment failure.

FIG. 10 is a plan view showing step by step a method of manufacturing a conventional liquid crystal display device 51.

FIG. 11 is a cross-sectional view showing step by step a method of manufacturing the liquid crystal display device 51.

FIG. 12 is a plan view showing stepwise a method of manufacturing another conventional liquid crystal display device 69.

FIG. 13 is a cross-sectional view showing step by step a method of manufacturing the liquid crystal display device 69.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2,8 Translucent substrate 3,9 Transparent electrode 4,10 Surfactant layer 5,11 Alignment film 6 One substrate member 7 Adhesive member 12 Other substrate member 13 Sealing member 14 Liquid crystal layer 15 Liquid crystal injection region 16 injection hole area 17 injection hole

Claims (6)

[Claims] 1. A pair of substrate members, at least one of which has translucency, a liquid crystal layer interposed between the pair of substrate members, and a liquid crystal layer of the pair of substrate members interposed between the pair of substrate members. The side surface is configured to include a space in which the liquid crystal is to be injected, an adhesive member that forms an injection hole that communicates with the space, and a sealing member that seals the injection hole, and the pair of substrate members includes: At least an insulating substrate, a display electrode formed on the liquid crystal layer side surface of the insulating substrate, and an alignment film formed on the insulating substrate on which the display electrode is formed so as to be in contact with the liquid crystal layer, In each of the liquid crystal display devices, the alignment film is injected by at least a first region on the insulating substrate on which the display electrodes are formed, in which a space where liquid crystal is injected by the adhesive member is formed, and by the adhesive member. Hole The liquid crystal display device, characterized in that provided in a second region made. 2. A pair of substrate members, at least one of which is translucent, a liquid crystal layer interposed between the pair of substrate members, and a liquid crystal layer of the pair of substrate members interposed between the pair of substrate members. The side surface is configured to include a space in which the liquid crystal is to be injected, an adhesive member that forms an injection hole that communicates with the space, and a sealing member that seals the injection hole, and the pair of substrate members includes: At least an insulating substrate, a display electrode formed on the liquid crystal layer side surface of the insulating substrate, and an alignment film formed on the insulating substrate on which the display electrode is formed so as to be in contact with the liquid crystal layer, In each of the liquid crystal display devices, the alignment film has a first region on the insulating substrate on which the display electrodes are formed, in which a space for liquid crystal is formed by the adhesive member, and an injection hole by the adhesive member. Shape The liquid crystal display device, characterized in that provided in the third region second region, and the adhesive member is a part of the area to be arranged is. 3. A width D of an area where the adhesive member is arranged.
3. The liquid crystal display device according to claim 2, wherein the width d of the third region where the adhesive member and the alignment film overlap each other is selected in the range of D>d> 0. 4. The shape of the first region is selected to be a rectangle, the shape of the second region is selected to be a rectangle smaller than the first region, and one side of the rectangular second region is one side of the rectangular first region. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is in contact with the liquid crystal display device. 5. An insulating substrate on which display electrodes are formed,
3. The liquid crystal display device according to claim 1, wherein at least a fourth region protruding from the second region toward the outside of the substrate member is covered with the sealing member. 6. The liquid crystal display device according to claim 1, wherein the alignment film is formed on a surfactant layer.