JP2000081846A - Image display device, manufacturing method thereof, and ink application device - Google Patents

Abstract

[PROBLEMS] To provide an image display device which does not easily cause a decrease in display quality in a peripheral portion of an image display region even when a frame portion of the image display device such as a liquid crystal display device is narrowed, and a method of manufacturing the same. . An image display panel is provided in which an image display area for displaying an image and a frame area surrounding the image display area are defined. Light-shielding ink is supplied from an ink supply source onto at least a part of the surface of the frame region of the image display panel. At this time, the ink supply source is prevented from contacting the image display panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, a method of manufacturing the same, and a manufacturing device. It relates to a manufacturing device.

[0002]

2. Description of the Related Art Heretofore, a color TFT (thin film transistor) liquid crystal display device of 10 to 11 inches has been mainly used for a portable personal computer. A 13-inch liquid crystal display device is being adopted. Increasing the size of the portable personal computer in accordance with the enlargement of the image display area goes against the demands of consumers. In order to suppress an increase in the size of the portable personal computer, it is necessary to narrow the frame of the liquid crystal display device.

[0003]

According to the evaluations of the present inventors, it has been found that when the frame portion of the liquid crystal display device is narrowed, the display quality in the peripheral portion of the image display area may be reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide an image display device, such as a liquid crystal display device, which does not cause deterioration in display quality at the periphery of the image display region even when the frame portion is narrowed, and a method of manufacturing the same. That is.

Another object of the present invention is to provide a manufacturing apparatus suitable for manufacturing the image display device.

[0006]

According to one aspect of the present invention, a step of preparing an image display panel in which an image display area for displaying an image and a frame area surrounding the image display area are defined in a plane. And supplying light-shielding ink from an ink supply source to at least a part of the surface of the frame area of the image display panel, wherein the light-shielding ink is provided without contacting the ink supply source with the image display panel. And a step of applying a hydrophilic ink.

Since the ink supply source does not contact the image display panel, the generation of dust can be prevented. The applied light-shielding ink blocks light leaking from a region near the edge of the image display panel, and can prevent display quality from deteriorating due to light leaking.

According to another aspect of the present invention, a holding table for holding a substrate, an ink head for ejecting fine droplets of ink, and the ink head are opposed to the substrate held on the holding table. A guide mechanism for holding a translation mechanism in a first direction parallel to the surface of the substrate.

By ejecting fine droplets of ink,
The coating can be performed without bringing the ink head into contact with the substrate.

According to another aspect of the present invention, a step of preparing an object to be applied having a step in an area on the surface to which ink is to be applied; A step of covering the periphery with a mask member, and a step of controlling the flying direction of the fine droplets of the ink to supply the fine droplets to a region of the surface of the object to be coated with the ink. An ink application method is provided.

When a fine droplet of ink collides with a step, it may pop and scatter. Since the periphery of the area to which the ink is to be applied is covered with the mask member, the splashed and scattered ink can be prevented from adhering to the area other than the area to be applied.

According to another aspect of the present invention, there is provided an image display panel in which an image display area for displaying an image and a frame area surrounding the image display area are defined, and an end face of the image display panel is defined. An image display device having a light-shielding film formed on at least a part of an area is provided.

According to another aspect of the present invention, there is provided an image display panel in which an image display area for displaying an image and a frame area surrounding the image display area are defined in a plane. An image display device is provided in which at least a part of an end face has a satin finish.

Since the light-shielding film is formed on the end face or the end face is matted, stray light in the space on the back side of the image display panel can be prevented from passing through the end face and leaking to the front face. .

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing embodiments of the present invention,
A description will be given of a cause of a decrease in display quality that may occur when the frame of the liquid crystal display device is narrowed. This has been newly found by the present inventors.

FIG. 9 is a sectional view showing the vicinity of a frame portion of a conventional liquid crystal display device. A TFT substrate 100 having a TFT and a pixel electrode formed on the surface thereof, and a CF substrate 101 having a common electrode formed on the surface thereof are arranged such that the surface on which the pixel electrode is formed and the surface on which the common electrode is formed are mutually moved. They are arranged facing each other. A liquid crystal layer 102 is sandwiched between two substrates 100 and 101. The periphery of the liquid crystal layer 102 is sealed with a sealant 106. Thus, a liquid crystal panel including the TFT substrate 100, the CF substrate 101, and the liquid crystal layer 102 is configured.

An image display area 110 for displaying an image and a frame area 111 surrounding the image display area 110 are defined on the liquid crystal panel. Image display area 1 on the opposite surface of TFT substrate 100
In 10, pixel electrodes are arranged in a matrix.

On the non-opposing surfaces of the TFT substrate 100 and the CF substrate 101, polarizing plates 103 and 104 are arranged, respectively. A backlight 105 is arranged to face the polarizing plate 103. The backlight 105 is TF
The liquid crystal panel is irradiated with illumination light from the T substrate 100 side.

A frame member 107 is arranged so as to cover a part of the outer periphery of the surface of the frame region 111 and the end surface of the liquid crystal panel. The frame member 107 prevents the illumination light emitted from the backlight 105 from leaking forward through the frame region 111 of the liquid crystal panel.

When the width of the frame region 111 is reduced, the illumination light radiated from the backlight 105
0 and the end face of the CF substrate 101, and may leak forward through the gap 112 between the frame member 107 and the CF substrate 101. In addition, light incident on the liquid crystal panel from the outside through the gap 112 repeatedly reflects on the surface and the end face of the TFT substrate 100 or the CF substrate 101, and the gap 112
May leak forward from

When light leaks from the gap 112, the display quality in the peripheral portion of the image display area 110 deteriorates. According to the embodiment of the present invention, a decrease in display quality due to light leaking from the gap 112 can be suppressed.

The present inventors have proposed a technique of applying light-shielding ink to the surface of a frame region corresponding to one side (for example, the upper side) of the CF substrate 101 using a felt tip pen. Applying the light-blocking ink only to the upper side is because the edges of the two substrates are aligned on the upper side and the fluorescent tubes in the backlight are arranged parallel to the upper and lower sides, so that the leakage light due to the reflection from the end surface This is because the number increases. By applying light-shielding ink to the surface of the frame area, the gap 11
2 can be reduced, and display quality can be improved.

However, when ink is applied using a felt tip pen, dust such as felt dust is generated. This dust causes the display quality of the liquid crystal panel to deteriorate. In the embodiments described below, generation of dust can be suppressed as much as possible, and light-shielding ink can be applied.

Referring to FIG. 1, a method of manufacturing a liquid crystal display according to an embodiment of the present invention will be described.

As shown in FIG. 1A, a first substrate 1 and a second substrate 2 are arranged to face each other, and a liquid crystal layer 3 is sandwiched therebetween to form a liquid crystal panel 4. The periphery of the liquid crystal layer 3
It is sealed with a sealing material 5. TFTs, pixel electrodes, and the like are formed in the image display area 10 on the opposite surface of the second substrate 2. On the facing surface of the first substrate 1, a common electrode, a color filter, and the like are formed. A frame area 11 surrounds an image display area 10 of the liquid crystal panel 4.

A polarizing plate 6 is arranged on the non-opposing surface of the first substrate 1, and a polarizing plate 7 is arranged on the non-opposing surface of the second substrate 2. The polarizing plates 6 and 7 cover the entire area of the image display area 10 and a part of the surface of the frame area 11 on the inner peripheral side.

On the frame area 11 on the non-opposite surface of the first substrate 1, a fine droplet 2 of light-shielding ink is
Supply 1 As the ink head 20, for example, a head of an ink jet printer, a head of a bubble jet printer, a syringe with a needle, or the like can be used. In the case of using a printer head, fine ink droplets are made to fly by controlling the flying direction and supplied onto the frame area 11. When using a syringe, fine droplets of ink are dropped on the frame region 11.

As shown in FIG. 1B, a part of the frame region 11 on the non-opposing surface of the first substrate 1 and a region near the end of the polarizing plate 6 are covered with a light shielding film 8 made of light shielding ink. Will be The backlight 9 is arranged so as to face the non-opposing surface of the second substrate 2. The backlight 9 is a liquid crystal panel 4
Is irradiated with illumination light. The frame member 15 is disposed so as to cover from the edge of the first substrate 1 to a certain position in the region where the light shielding film 8 is formed. The frame member 15 includes the liquid crystal panel 4
Windows corresponding to the image display area 10 are formed.

A part of the frame area 11 on the outer peripheral side is covered with the frame member 15, and a part of the area inside the area covered with the frame member 15 is covered with the light shielding film 8. When the liquid crystal panel 4 is viewed from the first substrate 1 side (front), the frame member 15 and the light shielding film 8 are arranged so as to overlap each other, and the inner peripheral edge of the frame member 15 and the image display area 10 Most of the region between the edge and the edge is covered with the light shielding film 8. The area between the light-shielding film 8 and the image display area 10 corresponds to the first or second substrate 1, 2.
The light is shielded by a light-shielding metal film or the like formed on the opposing surface.

It is necessary to secure an interval 12 between the edge of the image display area 10 and the inner edge of the frame member 15 in consideration of the mounting error of the frame member 15. The light shielding film 8 is formed in a region where the space 12 is secured. Light shielding film 8
Is formed by supplying fine droplets of ink or the like, so that the positional accuracy can be improved. That is, the distance between the inner edge of the light-shielding film 8 and the edge of the image display area 10 can be made smaller than the distance between the inner edge of the frame member 15 and the edge of the image display area 10. Therefore, most of the light reflected by the backlight 9 from the end face of the liquid crystal panel 4 is shielded by the light shielding film 8, and
Less likely to leak forward. Further, external light can be prevented from reaching the end face of the liquid crystal panel 4 from the front of the liquid crystal panel 4 through the interval 12. For this reason, it is possible to reduce leakage light due to light incident from the outside.

In order to sufficiently shield the leakage light, the light shielding film 8 must be used.
It is preferable to select the material and thickness so that the light transmittance is 50% or less. If the light-shielding film 8 is too thick, the light-shielding film 8 comes into contact with the frame member 15 and is easily peeled off.

The effect of light leakage due to light reflected from the end face of the liquid crystal panel 4 is significant in a region within 5 mm from the edge of the substrate. For this reason, it is preferable to arrange the light shielding film 8 in a region within 5 mm from the edge of the substrate.

By arranging the light-shielding film 8 on the surface of the frame region 11 as described above, light leakage from the frame region 11 can be reduced. For this reason, it is possible to prevent a decrease in display quality at the outer peripheral portion of the image display area 10.

On one side of the rectangular liquid crystal panel 4, the edge of the first substrate 1 and the edge of the second substrate 2 overlap as shown in FIG. 1B when viewed from the normal direction of the substrate. . On at least two of the other three sides, the edge of the first substrate 1 is located inside the edge of the second substrate 2.

FIG. 1C shows that the edge of the first substrate 1 is
2 is a cross-sectional view of a side located inside the edge of the substrate 2 of FIG.
In this case, the light shielding film 8 also covers the end surface of the first substrate 1. The first substrate 1 among the opposing surfaces of the second substrate 2
A plurality of terminals 16 for automatic tape bonding are formed in a region outside the edge of the tape. In order to stably secure the electrical insulation between the terminals 16, the electric resistivity of the light shielding film 8 is preferably set to 1 × 10 8 Ωcm or more.

In the above embodiment, the case where the light-shielding film 8 is formed by flying or dropping fine droplets of the light-shielding ink has been described. However, the light-shielding film 8 is shielded by another method such that the ink supply source does not contact the liquid crystal panel. A film 8 may be formed.

Next, an example of an apparatus for forming a light-shielding film by supplying fine droplets of light-shielding ink will be described.

FIG. 2 is a perspective view of an apparatus for manufacturing a liquid crystal display according to the embodiment. This manufacturing apparatus includes a holding table 30, a protective tape 40, an ink head 50, a CCD camera 51,
And the linear guide 52. An xy orthogonal coordinate system having an xy plane parallel to a horizontal plane with the guide direction of the linear guide 52 as the x-axis is considered.

The holding table 30 can hold the liquid crystal panel 4 horizontally thereon, rotate the held liquid crystal panel 4 along the xy plane, and translate the liquid crystal panel 4 in the y-axis direction.
The liquid crystal panel 4 is positioned with respect to the xy plane by bringing its end surface into contact with a stopper 31 formed on the upper surface of the holding table 30, and is vacuum-sucked to the holding table 30.

When the holding table 30 is moved in the y-axis direction, the liquid crystal panel 4 is disposed below the two CCD cameras 51. The two CCD cameras 51 are arranged on a straight line parallel to the x-axis, and detect a marker formed on the liquid crystal panel 4. The detection result is input to the control device 53. The control device 53 rotates the holder 30 so that the ink application area of the liquid crystal panel 4 is parallel to the x-axis.

After the alignment of the liquid crystal panel 4 in the rotation direction is performed, the holding table 30 is further moved in the y-axis direction.
0. The ink head 50 is supported by a linear guide 52 so as to be able to translate in the x-axis direction. Light-shielding ink is supplied to the ink head 50 from the ink tank 54. The protective tape 40 is provided on the feeding roll 4
2 and is passed through the space between the liquid crystal panel 4 and the ink head 50 in the x-axis direction and is taken up by a take-up roll (not shown).

The ink head 50 is mounted so as to face the liquid crystal panel 4 disposed below the ink head 50. The ink head 50 controls the flying direction of the fine droplets of the light-shielding ink to fly, so that a desired surface of the liquid crystal panel 4 is formed. Area can be reached. As the ink head 50, for example, Codeb manufactured by Domino Corporation
ox3, and BK0101 manufactured by Domino, for example, can be used as the light-shielding ink. Further, a dye or pigment ink using ketones such as methyl ethyl ketone or alcohols such as isopropyl alcohol, ethyl alcohol and methyl alcohol as a solvent may be used.

As will be described later with reference to FIG. 3, the protective tape 40 is composed of two polyethylene tapes arranged in parallel with each other. The protection tape 40 blocks the course of the fine droplet so that a part of the fine droplet flying from the ink head 50 does not reach the image display area or the like.

Next, a method for forming a light-shielding film using the apparatus for manufacturing a liquid crystal display device shown in FIG. 2 will be described.

The liquid crystal panel 4 is placed on the holding table 30,
The end face is brought into contact with the stopper 31 for positioning. The liquid crystal panel 4 is vacuum-sucked and fixed on the holding table 30.
The holding table 30 is rotated so that one side of the liquid crystal panel 4 is parallel to the x-axis. The holding table 30 is moved in the y-axis direction, and the region of the liquid crystal panel 4 where the light shielding film is to be formed is disposed below the ink head 50. While moving the ink head 50 in the x-axis direction, fine droplets of the light-shielding ink are sprayed on the surface of the liquid crystal panel 4.

The above steps are performed for one liquid crystal panel in four steps.
By repeating the above operation, light shielding films corresponding to the four sides of the liquid crystal panel 4 can be formed.

FIG. 3 is a cross-sectional view perpendicular to the x-axis of the ink spray portion of the manufacturing apparatus shown in FIG. First substrate 1,
The liquid crystal panel 4 includes the liquid crystal layer 3 and the second substrate 2. Polarizing plates 6 and 7 are attached on the outer surfaces of the first and second substrates 1 and 2, respectively. First
The substrate 1 is smaller than the second substrate 2, and the surface of the second substrate 2 is exposed in a region outside the edge of the first substrate 1. A film lead wire 4a is connected to the exposed surface by TAB technology.

The protective tape 40A is disposed above the image display area 10 of the liquid crystal panel 4, and the protective tape 40B is disposed above the area where the film lead 4a is connected. For example, the distance L1 between the edge of the first substrate 1 and the protection tape 40B is 0.2 to 0.5 mm, and the distance L2 from the edge of the first substrate 1 to the protection tape 40A is 1.2 to 1.4 m.
m.

The fine droplets flying toward the image display area 10 or the area to which the film lead wire 4a is connected are:
It is shielded by the protective tape 40A or 40B and does not reach the surface of the liquid crystal panel 4.

FIG. 4 shows an example of the arrangement of ink dots formed by spraying fine droplets.

FIG. 4A shows a case where each dot is located at each intersection of the orthogonal lattice pattern. FIG. 4B shows a case where each dot is located at each intersection of the oblique lattice pattern. That is, the dots are arranged in parallel to the x-axis and in a direction parallel to the virtual straight line 60 intersecting the x-axis at an angle θ. FIG. 4A shows the angle θ in FIG.
Is 90 °.

FIG. 4A shows a case where the ink dots are arranged such that adjacent ink dots are in direct contact with each other.
The coverage of the substrate surface with the ink dots shown in FIG.
%. On the other hand, the coverage when the angle θ in FIG. 4B is 60 ° is 90.6%. When the angle θ is 60 °, the coverage becomes maximum. Angle θ 50-70 °
By doing so, it will be possible to effectively shield the leaked light.

Next, an example of a method for forming the ink dot pattern shown in FIG. 4B will be described.

An imaginary straight line 60 crossing the x-axis at an angle of 60 °
A plurality of application target points P arranged at intervals G1 along
1 supplies fine droplets. Next, a plurality of application target points P
1 is supplied to the application target point P2 moved by a distance equal to or shorter than the interval G1 in the x-axis direction. By repeatedly moving the point for supplying the fine droplet in the x-axis direction and supplying the fine droplet,
A dot pattern as shown in FIG. 4B can be formed.

FIG. 4C shows a method of performing the second ink application by shifting the application target point to which the fine ink droplets are supplied in the step of FIG. 4B in the x-axis direction. The circle shown by the solid line in FIG. 4C indicates the ink dot pattern formed in the step of FIG. 4B, and the circle shown by the broken line indicates the ink dot pattern formed by the second ink application.

The application target points to which the fine ink droplets are supplied in the second ink application step are the application target points to which the fine ink droplets are supplied in the x-axis direction in the first ink application step. Located in the gap. As described above, by performing the second ink application while shifting the application target point, the surface coverage by the ink dots can be increased.

In the above embodiment, the case where the light shielding film 8 is formed after the polarizing plate 6 is attached in the step of FIG. 1A has been described. However, the light shielding film 8 is formed before the polarizing plate 6 is attached. May be. In this case, when the fine droplets of the ink are sprayed, there is no step on the surface of the liquid crystal panel, so that the diffusion of the ink particles can be suppressed and the light shielding film 8 having a uniform film thickness can be formed. However, since the polarizing plate 6 is stuck on the light shielding film 8, the polarizing plate 6 is easily peeled off.

In the above embodiment, the case where the light shielding film 8 is formed on the front surface of the liquid crystal panel 4 as shown in FIGS. 1B and 1C has been described. If leakage light due to external incident light is not a problem, the liquid crystal panel 4
The light shielding film 8 may be formed on the surface behind (the surface on the backlight 9 side). Also in this case, leakage of illumination light emitted from the backlight 9 can be prevented.

Next, an ink coating apparatus according to another embodiment will be described with reference to FIG.

FIGS. 5A and 5B are a plan view and a front view, respectively, of an ink coating apparatus according to an embodiment.
This ink application device includes a holding table 60, a protection wire 65,
It includes a shielding plate 66, an ink head 70, a CCD camera 75, a guide mechanism 80, a translation mechanism 85, a rotation mechanism 90, and control means 95.

The holding table 60 has a liquid crystal panel 61 on its upper surface.
Is held substantially horizontal. Consider an xy orthogonal coordinate system in a horizontal plane. The liquid crystal panel 61 is positioned and vacuum-adsorbed in the xy plane by bringing the plurality of projections 62 provided on the upper surface of the holding base 60 into contact with the end faces.

The rotation mechanism 90 rotates the holding table 60 in the xy plane. The translation mechanism 85 translates the holding table 60 in the y-axis direction. The ink head 70 and the CCD camera 75 are attached to the guide mechanism 80 so as to be movable in the x-axis direction. When the ink head 70 and the CCD camera 75 move in the x-axis direction, they pass above the liquid crystal panel 61 held by the holding table 60. At least two alignment marks are formed on the liquid crystal panel 61. When the CCD camera 75 passes above the liquid crystal panel 61, the alignment mark is detected. The detection result is input to the control means 95.

The control means 95 drives the translation mechanism 85 and the rotation mechanism 90 to place the liquid crystal panel 61 at a predetermined position. The ink head 70 supplies fine droplets of ink onto the surface of the liquid crystal panel 61 when passing over the liquid crystal panel 61. The ink head 70 has a nozzle for ejecting fine droplets of ink. As the ink head 50, for example, Codebox3 manufactured by Domino can be used, and BK0101 manufactured by Domino can be used as the light-shielding ink.

The periphery of the area of the liquid crystal panel 61 to which ink is to be supplied is covered with a protective wire 65 and a shielding plate 66. Rolls 67A and 67B are arranged at both ends of a protective wire 65 stretched over the liquid crystal panel 61. One roll 67A pays out the protection wire 65, and the other roll 67B takes up the protection wire 65. Roll 67A
A pin 68 is arranged slightly inside of the first and second parts 67B and 67B. The pin 68 presses the protection wire 65 downward. By changing the height of the pin 68, the height of the protection wire 61 from the surface of the liquid crystal panel 61 can be adjusted. As the protective wire 65, for example, a thickness of 0.5 m
m fishing lines (tegs) can be used. Shield plate 6
As 6, for example, a resin or metal plate material having a thickness of about 0.5 to 1 mm can be used.

The shielding plate 66 is provided above the liquid crystal panel 61.
It is fixed so as to be arranged at a certain distance from its surface.

FIG. 6 is a sectional view of the ink application section during ink application. A liquid crystal panel 61 includes a first substrate 61a and a second substrate 61 arranged in parallel with each other with a certain gap therebetween.
b. When viewed from the substrate normal direction, the edge of the first substrate 61a is located inside the edge of the second substrate 61b. Note that, for example, in one of the four sides of the liquid crystal panel 61, the edges of the two substrates 61a and 61b overlap when viewed from the substrate normal direction.

The first polarizing plate 61c is arranged on the outer surface of the first substrate 61c, and the second polarizing plate 61d is arranged on the outer surface of the second substrate 61b. A liquid crystal material 61e is sandwiched between two substrates 61a and 61b. The liquid crystal material 61f is sealed with a sealing member 61f.

A film lead wire 61g is connected to a region of the facing surface of the second substrate 61b located outside the edge of the first substrate 61a. Film lead wire 6
1g is connected by, for example, a tape automatic bonding (TAB) technique.

A shielding plate 66 covers a region of the surface of the first substrate 61a which is adjacent to the inner peripheral side of the region to which ink is to be applied. The protection wire 6 is provided on the end face of the first substrate 61a.
5 are arranged. The protection wire 65 is connected to the first substrate 6.
It may be in contact with the end face of 1a or may be slightly separated from the end face. Until the liquid crystal panel 61 is positioned at a predetermined position where ink is to be applied, the protection wire 65 stands by above the liquid crystal panel 61 as shown by a broken line in the figure. The fine droplets 71 of the ink are made to fly toward the region of the first substrate 61a where the ink is to be applied.

The fine droplets that have deviated from the predetermined flight path to the inside of the substrate are blocked by the shielding plate 66, and the first substrate 6
Does not reach 1a. The fine droplet colliding with the step portion of the liquid crystal panel 61 bursts and scatters around. The scattered ink is blocked by the protective wire 65, and the film lead 61g
Is prevented from adhering to the terminals. As described above, the protection wire 65 and the shielding plate 66 allow the liquid crystal panel 61
By covering the periphery of the ink application area, it is possible to prevent the ink from adhering to the periphery of the ink application area.

Next, a method of applying ink to the frame area of the liquid crystal panel 61 using the ink applying apparatus shown in FIGS. 5 and 6 will be described.

The liquid crystal panel 61 is placed on the holding table 60, and its end face is brought into contact with the projection 62 for positioning. The liquid crystal display panel 61 is vacuum-sucked and fixed to the holding table 60. The holder 60 is rotated so that one side of the liquid crystal panel 61 is parallel to the x-axis. The holding table 60 is moved in the y-axis direction so that the area where the ink is to be applied is located below the ink head 70. The CCD camera 75 is moved in the x-axis direction to detect an alignment mark formed on the liquid crystal panel 61. The area to apply ink is
The position and orientation of the holding table 60 are finely adjusted so as to be arranged at a predetermined position.

The protection wire 65 is lowered and the liquid crystal panel 6
It is made to approach the end face of one first substrate 61a. While moving the ink head 70 in the x-axis direction, fine ink droplets are made to fly, and the fine ink droplets are supplied to the ink application area of the liquid crystal panel 61.

The above-described ink application processing is performed on each side of one liquid crystal panel, and the ink is applied to the frame area corresponding to the four sides. Thus, a light-shielding film can be formed in the frame region of the liquid crystal panel 61.

FIGS. 5 and 6 show the protection wire 6 in order to prevent the ink from adhering to the terminal portion of the lead wire.
5 blocked fine droplets of the ink. Next, an embodiment in which fine droplets of ink are shielded using a film-like member will be described.

FIG. 8A is a schematic perspective view of an ink coating apparatus according to an embodiment using a film-like member. Holder 60
A liquid crystal panel 61 is placed on the display. LCD panel 6
1 is positioned by contacting the protrusion 62.

In the embodiment shown in FIG. 8A, a shielding plate 100 and a shielding film 101 are provided instead of the protective wires. One edge (tip) of the shielding plate 100 is pressed against the end surface of the first substrate 61a of the liquid crystal panel 61. The shielding film 101 is fed out from the feeding roll 105. The fed-out shielding film 101 is guided along the lower surface of the shielding plate 100 to the tip thereof, and is folded back at the tip.

The folded shielding film 101 is provided on the shielding plate 10.
It is guided to the winding roll 106 along the upper surface of 0 and wound on the winding roll 106. As the shielding film 101, for example, a plastic film made of polyester, polycarbonate, polyethylene, or the like, or a cloth made of synthetic fibers such as nylon can be used. FIG.
In FIG. 5A, the ink head and the like are omitted, but FIG.
An ink head having the same configuration as that of the ink head 70 is arranged.

The shielding plate 100 is supported by a support bar 110 via a coil spring 111. The support rod 110 supports the shielding plate 100 so that the folded portion of the shielding film 101 contacts the end surface of the first substrate 61a.
00 is saved. Since the coil spring 111 is arranged, the tip of the shielding plate 100 automatically matches the end surface of the first substrate 61a. Note that, instead of the coil spring 111, an elastic component or the like using gas may be used. The fine ink droplets are shielded by the shielding film 101 and the second substrate 6
Adhesion of the ink to the terminal portion 1b is prevented. When the shielding plate 100 is retracted, the feeding roller 105 and the winding roller 106 are also retracted at the same time.

When the application of the ink is completed, the take-up roll 106 is driven to take up the shielding film 101 by a predetermined length. Since the portion where the ink has adhered is kept away from the tip of the shielding plate 100, the liquid crystal panel 61 is removed from the shielding film 101.
Can be prevented from re-adhering to the ink.

FIG. 8B is a sectional view showing the vicinity of the tip of the shielding plate 100. The distal end portion 100b of the shielding plate 100 is formed of a material having higher elasticity than the base portion 100a, for example, rubber or the like. By forming the tip portion 100b of a material having high elasticity, irregularities on the end face of the first substrate 61a and the tip portion of the shielding plate 100 are absorbed, and the shielding film 101 is formed on the first substrate 61.
a.

In the above embodiment, the case where the light-shielding ink is applied to the surface of the frame area of the liquid crystal panel to reduce the leakage light has been described. Next, an embodiment in which a light-shielding film is formed on an end face of a liquid crystal panel will be described with reference to FIG.

As shown in FIG. 7A, a liquid crystal panel including first and second substrates 61a and 61b, first and second polarizing plates 61c and 61d, a liquid crystal material 61e, and a sealing member 61f. 61 are configured. A light-shielding film 72 is formed on the end surfaces of the first and second substrates 61a and 61b. A frame member 63 is attached so as to cover a part of the outer peripheral side of the frame region of the liquid crystal panel 61 and an end surface thereof.
The light-shielding film 72 can be formed by, for example, discharging the light-shielding ink while moving the tip of the injection needle along the end surface of the liquid crystal panel 61.

When stray light exists in the gap between the frame member 63 and the liquid crystal panel 61, it is possible to prevent the stray light from passing through the end face of the liquid crystal panel 61 and leaking forward. In addition,
Instead of forming the light-shielding film 72 on the end face of the liquid crystal panel 61, the end face may be processed into a satin finish.

FIG. 7B shows a method of processing the end face of the liquid crystal panel 61 into a satin finish. The protective cover plates 96 are brought into close contact with both sides of the liquid crystal panel 61, respectively.
Protect the surface. The nozzle 9 is provided on the end face of the liquid crystal panel 61.
From 7, a high-pressure gas containing ceramic abrasive particles is blown. The abrasive particles scrape off the end face of the liquid crystal panel 61, and the end face becomes matte. The end face may be polished or chemically etched to form a satin finish.

The deterioration of the display quality due to the leaked light transmitted through the end face is likely to occur in the portion where the edges of the two substrates are aligned as shown in FIG. As shown in FIG.
In a portion where the end faces of the substrates are shifted, the influence of the leakage light is small. This is because a substantial end surface area is increased in the portion where the edges are aligned. For this reason, a great effect can be expected by forming a light-shielding film on the end face corresponding to the portion where the edges of the two substrates are aligned, or by forming the end face in a satin shape.

As shown in FIG. 1, even when a light-shielding film is formed on the surface of the frame region, the light-shielding film is particularly formed on the frame region corresponding to the portion where the edges of the two substrates are aligned. As a result, a great effect can be expected. If there is no deterioration in display quality in a portion where the edges of the two substrates are not aligned, or if the deterioration in display quality is slight, the light-shielding film may not be formed in this portion. In this case, the number of manufacturing steps can be reduced.

In the above embodiment, the case where the display quality is prevented from deteriorating near the frame region has been described by taking a liquid crystal panel as an example. These embodiments can also be applied to an image display device using a transparent substrate other than a liquid crystal panel, for example, a plasma display panel (PDP). Further, the ink application device shown in FIG. 5 is not limited to an image display device, and can apply ink to other objects. In particular, the effect of providing the protection wire 65 is greater when ink is applied on a surface having a step.

The present invention has been described in connection with the preferred embodiments.
The present invention is not limited to these. For example, it will be apparent to those skilled in the art that various modifications, improvements, combinations, and the like can be made.

[0090]

As described above, according to the present invention,
By forming a light-shielding film made of light-shielding ink in the frame area of the image display panel, it is possible to prevent the reflected light from leaking from the end face of the image display panel and to improve the display quality in the periphery of the image display area. Since application is performed without bringing the ink supply source into contact with the image display panel, generation of dust can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a liquid crystal display for explaining a method of manufacturing a liquid crystal display according to an embodiment of the present invention.

FIG. 2 is a perspective view of an apparatus for manufacturing a liquid crystal display according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of the vicinity of an ink spraying portion of the manufacturing apparatus shown in FIG.

FIG. 4 is a plan view showing a configuration of ink dots formed by spraying fine droplets of ink on a liquid crystal panel.

FIG. 5 is a plan view and a front view of the ink application device according to the embodiment.

6 is a cross-sectional view of the vicinity of an ink application area of the ink application apparatus shown in FIG.

FIG. 7 is a cross-sectional view of a liquid crystal panel according to another embodiment of the present invention and a diagram for explaining a method of performing satin finish.

FIG. 8 is a schematic perspective view of an ink application apparatus according to another embodiment of the present invention, and a cross-sectional view of a tip portion of a shielding plate.

FIG. 9 is a cross-sectional view of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st board | substrate 2 2nd board | substrate 3 liquid crystal layer 4 liquid crystal panel 5 sealing material 6, 7 polarizing plate 8 light shielding film 9 backlight 10 image display area 11 frame area 15 frame member 16 TAB terminal 20 ink head 21 light shielding Fine droplets of ink 30 Holder 31 Stopper 40 Protective tape 42 Feeding roll 50 Ink head 51 CCD camera 52 Linear guide 53 Controller 54 Ink tank 60 Holder 61 Liquid crystal panel 62 Projection 63 Frame member 65 Protective wire 66 Shielding plate 67A, 67B Roll 68 Pin 70 Ink head 71 Fine droplet of ink 72 Light shielding film 75 CCD camera 80 Guide mechanism 85 Translation mechanism 90 Rotating mechanism 95 Control means 96 Protective cover plate 97 Nozzle 100 Shielding plate 101 Shielding film 105 Feeding roll 106 Winding B Le 110 support rod 111 spring

Continued on the front page (72) Inventor Kei Nishijima 4-1-1, Kamidadanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture Inside Fujitsu Limited (72) Inventor Ryo Imai 4-1-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa Fujitsu Limited (72) Inventor Taiji Yuhara 650 Otsuka No. 2-2, Ishizu Pref., Yonago City, Tottori Yonago Fujitsu, Ltd. In-company (72) Inventor Toshiro Katsube 650, Otsukano, Ishizu, Yonago, Tottori Pref.

Claims (23)

[Claims] A step of preparing an image display panel in which an image display area for displaying an image and a frame area surrounding the image display area are defined, and a surface of the frame area of the image display panel is provided. Supplying a light-shielding ink from an ink supply source to at least a part of the area, and applying the light-shielding ink to the image display panel without contacting the ink supply source. Manufacturing method. 2. The image display panel according to claim 1, wherein the image display panel has a step on the surface of a frame area thereof, and in the step of applying the light-shielding ink, the light-shielding ink is applied so as to straddle the step. Manufacturing method of an image display device. 3. The step of applying the light-shielding ink includes the steps of controlling a plurality of fine droplets of the light-shielding ink to fly, and the step of applying the flying fine droplets of the light-shielding ink to the image. Supplying the light to at least a part of the frame area of the display panel. 4. The method according to claim 1, wherein the step of applying the light-shielding ink includes a step of dropping fine droplets of the light-shielding ink onto at least a part of a frame area of the image display panel. A manufacturing method of the image display device described in the above. 5. The step of applying the light-shielding ink comprises: applying fine particles of the light-shielding ink to each of a plurality of application target points arranged on a virtual straight line parallel to a first direction in the surface of the image display panel. A first step of supplying droplets, and applying the application target points arranged in the first direction in a state in which the arrangement direction of the application target points is maintained in a second direction obliquely intersecting with the first direction. A second step of supplying fine droplets of light-shielding ink to each of the application target points while moving. 6. The method according to claim 1, further comprising:
Supplying fine droplets of light-shielding ink to each of the application target points while moving the application target points arranged in the second direction in the second direction.
6. The image display device according to claim 5, further comprising a third step of moving the application target point so as to be located in a gap between the application target points to which the fine droplets are supplied in the second step. Production method. 7. The method of manufacturing an image display device according to claim 1, wherein the step of applying the light-shielding ink includes a step of covering a periphery of an area to which the light-shielding ink is to be applied with a shielding member. Method. 8. In the step of covering with the shielding member, the shielding film is folded back along a certain imaginary straight line, and a region near the folded portion covers the periphery of the region where the light-shielding ink is to be applied. After applying the light-shielding ink, sending the shielding film in a direction intersecting with the virtual straight line, folding the shielding film at different positions, and using the shielding film folded at different positions as a shielding member,
8. The method for manufacturing an image display device according to claim 7, comprising a step of applying a light-shielding ink to another area to which the light-shielding ink is to be applied. 9. The image display panel includes first and second substrates arranged parallel to each other at an interval.
A part of the edge of the first substrate overlaps a part of the edge of the second substrate, and another part of the edge of the first substrate is located inside the edge of the second substrate. 9. The method according to claim 1, wherein, in the step of applying the light-shielding ink, the light-shielding ink is applied to a frame area corresponding to a mutually overlapping portion of edges of the first and second substrates. 3. The method for manufacturing an image display device according to 1. 10. A holding table for holding a substrate, an ink head for ejecting fine droplets of ink, and a second ink head facing the substrate held on the holding table and parallel to the surface of the substrate. A guide mechanism for holding the translation mechanism so as to be able to translate in one direction. 11. The holding table is capable of rotating a substrate held by the holding table in an in-plane direction.
0. The ink application device according to 0. 12. The ink application device according to claim 10, further comprising a translation mechanism that translates the holding table in a direction orthogonal to the first direction. 13. The ink according to claim 10, further comprising a shielding member disposed so as to cover a periphery of a region to which the ink is to be applied on a surface of the substrate held by the holding table. Coating device. 14. The shield member has a ribbon-like or thread-like shape stretched in parallel to the first direction, and a pair of reels disposed at both ends of the shield member. 14. The ink coating apparatus according to claim 13, wherein the reel has the pair of reels that feeds out the shielding member and the other reel winds up the shielding member. 15. The shielding member, comprising: a shielding plate disposed so that a first edge is parallel to the first direction; and a shielding film folded back at the first edge of the shielding plate. The ink application device according to claim 13, comprising: 16. A feeding roll on which the shielding film is wound, and a feeding roll for feeding the shielding film; and a winding for feeding the shielding film fed from the feeding roll and folded at the first edge of the shielding plate. The ink application device according to claim 15, further comprising a roll. 17. The screen according to claim 15, wherein the first edge of the shielding plate is defined by a material having a higher elasticity than other portions.
Or an ink application device according to item 16. 18. A shielding plate supporting means for supporting the shielding plate, wherein when an external force is applied to the first edge, the first direction is changed with respect to the plane of the substrate held by the holding table. 2. The shielding plate supporting means for elastically supporting the first edge so as to change the direction of the first edge within a certain range.
18. The ink coating device according to any one of 5 to 17. 19. A step of preparing an object to be applied having a step in an area on the surface of the object to which ink is to be applied, and a step of covering the periphery of the area of the object to be applied with ink with a mask member And a step of controlling the flight direction of the fine droplets of the ink to supply the fine droplets to a region of the surface of the object to be coated with the ink. 20. An image display panel in which an image display area for displaying an image and a frame area surrounding the image display area are defined in a plane, the image display panel comprising: a first substrate; A second substrate disposed in parallel with the first substrate at a distance from the first substrate, wherein the second substrate is viewed from a normal direction of the substrate.
A part of the edge of the first substrate overlaps with a part of the edge of the first substrate, and the other part of the edge of the second substrate is located inside the edge of the first substrate. An image display device comprising: a panel; and a light-shielding film formed at a portion of an end surface of the image display panel corresponding to a portion where edges of the first and second substrates overlap. 21. Another light-shielding film that covers at least a part of a frame area of the image display panel corresponding to an overlapping part of an edge of the first and second substrates is formed. The image display device according to claim 20, wherein 22. An image display panel in which an image display area for displaying an image and a frame area surrounding the image display area are defined, and at least a part of an end face of the image display panel. An image display device having a satin finish. 23. The image display panel, comprising: a first substrate; and a second substrate disposed in parallel with the first substrate at a certain distance from the first substrate, wherein the second substrate is viewed from a normal direction of the substrate. A part of the edge of the second substrate overlaps a part of the edge of the first substrate;
And a second substrate whose other portion is located inside the edge of the first substrate, and an end face corresponding to an overlapping portion of the edges of the first and second substrates has 23. The image display device according to claim 22, wherein the image display device has a satin finish.