JP2008070541A - Manufacturing method of liquid crystal display, and liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display 10 which prevents the liquid crystal material from leaking by reliably sealing the filling hole, and whose panel size is precisely formed, and also to provide a manufacturing method of the liquid crystal display 10. <P>SOLUTION: The manufacturing method of a liquid crystal display 10 has steps of: forming sealing frames 20 with apertures 22 opened and extending to the outside on the surface of the first transparent panel; making a stacked panel by adhering a second transparent panel to the first panel with the sealing frames 20 through them, a step of supplying a liquid crystal material through the apertures 22 to the areas surrounded by the sealing frames 20 on the stacked panel; hardening sealant 25 after supplying them to the apertures 22 used for filling the liquid crystal material on the stacked panel; and cutting the stacked panel with the hardened sealants 25 at the line crossing the hardened sealants 25 along the edges 24 of the apertures 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a liquid crystal display device and a liquid crystal display device.

In general, a liquid crystal display panel used for a liquid crystal display (LCD) is manufactured by bonding a TFT substrate and a color filter substrate with a slight gap between each other and a frame-shaped sealing material partially missing. The In such a liquid crystal display panel, a liquid crystal injection hole is constituted by a missing portion of the frame-shaped sealing material. For example, as described in Patent Document 1, after injecting liquid crystal into the gap between the TFT substrate and the color filter substrate from the liquid crystal injection hole, a sealing resin such as photo-curing is put into the liquid crystal injection hole. The liquid crystal injection hole is sealed by being supplied and cured.
JP 2005-338396 A

  Here, a conventional general liquid crystal injection hole sealing process will be described. As shown in FIG. 7, in the conventional general sealing process, a liquid crystal material is injected from a liquid crystal injection hole 102 into a display region 106 surrounded by a frame-shaped seal portion 101 between substrates of a liquid crystal display panel 100. Thereafter, the sealing material 103 is supplied to the liquid crystal injection hole 102.

  However, when the liquid crystal injection hole 102 is sealed by such a sealing process, the sealing material 103 protrudes from the edge 104 of the liquid crystal display panel 100 to the outside. When the sealing material 103 protrudes from the edge 104 of the liquid crystal display panel 100 to the outside as described above, the panel may not fit in the bezel at the time of assembling the liquid crystal module and the assembly may be difficult.

  Moreover, the sealing material 103 just supplied in this way is not formed in a desired shape, and there is a possibility that the sealing performance is defective. In such a case, liquid crystal leakage from the liquid crystal injection hole 102 of the liquid crystal display panel 100 occurs, resulting in a problem that display quality is deteriorated.

  The present invention has been made in view of such various points, and an object of the present invention is to provide a liquid crystal that seals a liquid crystal injection hole well to suppress leakage of a liquid crystal material and accurately forms panel dimensions. A manufacturing method of a display device and a liquid crystal display device are provided.

  The method for manufacturing a liquid crystal display device according to the present invention includes a step of forming a frame-shaped seal portion on the surface of a transparent first substrate so that a part of the frame-shaped seal portion is opened and extends to the outside of the first substrate; A step of forming a bonded substrate having an opening by bonding a transparent second substrate to the first substrate on which the seal portion is formed via the frame-shaped seal portion, and being surrounded by the frame-shaped seal portion of the bonded substrate Supplying a liquid crystal material from the opening to the region; supplying a sealing material to the opening of the bonded substrate to which the liquid crystal material is supplied; and curing the bonded substrate with the cured sealing material; And cutting along a dividing line that passes along the formed edge and passes over the cured encapsulant.

  According to such a configuration, after supplying the sealing material to the liquid crystal injection hole, the bonded substrate is further cut along the edge by a dividing line on the sealing material. It is tightly packed and does not protrude outward from the edge. This facilitates assembly of the liquid crystal module. Moreover, the occurrence of liquid crystal leakage from the liquid crystal injection hole can be satisfactorily suppressed.

  In the method for manufacturing a liquid crystal display device according to the present invention, the sealing material may be formed of an ultraviolet curable material, and the sealing material may be cured by irradiation with ultraviolet light.

  In order to divide and delete the panel on the sealing material supplied to the liquid crystal injection hole, the liquid crystal injection hole must be made deep with a margin, but according to the above configuration, the panel The sealing material supplied from the edge to the deep part of the liquid crystal injection hole can be cured well.

  Furthermore, in the method for manufacturing a liquid crystal display device according to the present invention, a plurality of frame-shaped seal portions are formed so as to surround predetermined regions of the first substrate and their openings face the same edge side of the first substrate. And a step of dividing the bonded substrate along a dividing line passing over the cured sealing material along the edge where the plurality of openings formed by the plurality of frame-shaped seal portions are formed.

  According to such a configuration, a large-sized bonded substrate having a plurality of display areas is divided at a time along the dividing line, so that the liquid crystal module can be easily assembled and liquid crystal leakage from the liquid crystal injection hole is prevented. A liquid crystal display device that can be favorably suppressed can be efficiently manufactured.

  A liquid crystal display device according to the present invention is a liquid crystal display device having first and second substrates bonded together through a liquid crystal material and a frame-shaped seal portion provided so as to surround the liquid crystal material. The shaped seal portion is formed such that a part thereof is opened and reaches the edges of the first and second substrates. The opening is filled with the sealing material, and the sealing material is the first sealing material. And it does not protrude outward from the edge of the second substrate.

  According to such a configuration, the liquid crystal injection hole is filled with the sealing material, and the sealing material does not protrude outward from the edges of the first and second substrates, so that the liquid crystal module can be easily assembled. . Moreover, the occurrence of liquid crystal leakage from the liquid crystal injection hole can be satisfactorily suppressed.

  As described above, according to the present invention, a method for manufacturing a liquid crystal display device and a liquid crystal display device are provided, in which liquid crystal injection holes are well sealed to prevent leakage of liquid crystal material and panel dimensions are formed with high accuracy. can do.

  Hereinafter, a liquid crystal display device and a manufacturing method thereof according to embodiments of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiment.

(Configuration of the liquid crystal display device 10)
FIG. 1 is a sectional view of a liquid crystal display device 10 according to an embodiment of the present invention.

  The liquid crystal display device 10 includes a liquid crystal display panel 12, a backlight 13, and the like.

  The liquid crystal display panel 12 includes a TFT (thin film transistor) substrate 14 and a CF (color filter) substrate 15 facing each other, a frame-shaped seal portion 20 provided therebetween, a liquid crystal layer 21, and a spacer (not shown). ing.

  In the CF substrate 15, a color layer composed of three primary colors of red (R), green (G), and blue (B) is formed on a substrate formed of glass or the like. As the color layer, in addition to RGB combinations, cyan, magenta, and yellow complementary colors may be used.

  A counter electrode (not shown) and an alignment film are formed on the color layer. On the outer periphery of the color layer, a black matrix (light shielding layer) is provided as a border for obtaining contrast, and a light shielding region 30 is formed.

  The TFT substrate 14 is composed of a substrate formed of glass or the like, a TFT element such as a gate electrode, a source electrode and a drain electrode (not shown) formed on the substrate, a transparent insulating layer, a pixel electrode, an alignment film, and the like. Yes.

  The frame-shaped seal portion 20 is provided between the CF substrate 15 and the TFT substrate 14 and adheres both substrates. The frame-shaped seal portion 20 is disposed so as to surround the display area 31, thereby forming a liquid crystal display cell. The frame-shaped seal part 20 is made of an ultraviolet curable adhesive such as a radical polymer such as methacryl or acrylic resin. The frame-shaped seal portion 20 has an opening 22 at, for example, a substantially central portion of one side thereof.

  Here, FIG. 2 shows an enlarged view of the vicinity of the opening 22 of the frame-shaped seal portion 20. The opening 22 of the frame-shaped seal portion 20 is formed so as to reach the edge 24 of the liquid crystal display panel 12. The opening 22 of the frame-shaped seal portion 20 is filled with an ultraviolet curable sealing material 25 such as a radical polymer such as methacryl or acrylic resin. The sealing material 25 does not protrude outward from the edge 24 of the liquid crystal display panel 12, and the edge 26 of the sealing material 25 and the edge 24 of the liquid crystal display panel 12 constitute the same line.

  The backlight 13 is disposed on the TFT substrate 14 side of the liquid crystal display panel 12. The backlight 13 has a light source, a light guide plate that emits light emitted from the light source and propagates through the light source toward the liquid crystal display panel 12, and directs light emitted from the back surface of the light guide plate toward the light guide plate. And a reflecting plate (both not shown).

(Manufacturing method of the liquid crystal display device 10)
Next, an example of a method for manufacturing the liquid crystal display device 10 according to the embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, a large-sized CF substrate and a large-sized TFT substrate each having a plurality of display regions formed on a large-sized substrate are manufactured, and these are bonded together and then divided to manufacture individual liquid crystal display panels. Will be explained.

(Manufacturing process of large format CF substrate 35)
First, a substrate formed of glass or the like is prepared, and then, as shown in FIG. 3, only a region having a predetermined width (a display element non-formation region 36) is left at one end of the substrate, and a plurality of regions in other portions are left. Each of the display elements is formed.

  That is, first, a black matrix having a width of, for example, about 5 to 50 μm is formed on the portion to be the light shielding region 30 by a sputtering method. Next, a resin film (dry film) in which a red pigment is dispersed is laminated on the entire surface of the display area 31 and the light shielding area 30 on the substrate, and exposure, development, and baking (heat treatment) are performed, so that the first color layer ( Red). Next, a resin film in which a green pigment is dispersed is laminated on the entire surface so as to overlap the first color layer, and exposure, development, and baking (heat treatment) are performed to form a second color layer (green). Similarly, a third color layer (blue) is formed.

  The color layer may be formed in a stripe arrangement or a delta arrangement. As a method for forming the color layer, instead of laminating a dry film, a photosensitive resin material in which a pigment is dispersed may be applied to the entire surface by spin or slit coating. Furthermore, the order of forming each color of the colored layer is not particularly limited, and may be other orders.

  Next, ITO (Indium Tin Oxide) is deposited on the color layer to form a transparent electrode and a transparent dielectric layer (not shown).

  Next, a spacer made of a photosensitive resin or the like is formed on the transparent dielectric layer. The spacer is formed in the same process in the display area 31 and the light shielding area 30 by photolithography.

  As a result, a large CF substrate 35 having a display element non-formation region 36 at one end of the substrate and provided with a plurality of display regions 31 is completed.

(Manufacturing process of large-sized TFT substrate 40)
Subsequently, a substrate formed of glass or the like is prepared. Next, as shown in FIG. 4, only a region having a predetermined width (display element non-formation region 41) is left at one end of the substrate, and a plurality of other portions are formed. A display element is formed in each region.

  That is, first, a gate electrode made of Ta or Al / Ti is formed by sputtering and patterned.

  Next, SiNx is formed as a gate insulating film, semiconductor a-Si is formed as a thin film, then SiNx is formed as an etching protective film, and after pattern formation, an interlayer insulating film is formed.

  Next, ITO is vacuum-deposited to form a transparent electrode, and then a contact hole, a drain electrode, and a source electrode are formed.

  Thus, a large TFT substrate 40 having a display element non-formation region 41 at one end of the substrate and provided with a plurality of display regions 31 is completed.

(Laminated substrate formation process)
Next, the frame-shaped seal portion 20 is formed on the large TFT substrate 40. As shown in FIG. 4, the frame-shaped seal portion 20 is provided so as to surround each of the plurality of display regions 31 of the large-sized TFT substrate 40, and a part of each of the display areas 31 is opened to display the large-sized TFT substrate 40 The non-forming region 41 is formed so as to extend to the outside of the large TFT substrate 40.

  Next, a large CF substrate 35 is bonded to the large TFT substrate 40 on which the frame-shaped seal portion 20 is formed via the frame-shaped seal portion 20. At this time, bonding is performed so that the display element non-formation regions 36 and 41 of both substrates overlap.

  Next, the frame-shaped seal portion 20 is irradiated with ultraviolet light to be cured, and the large TFT substrate 40 and the large CF substrate 35 are bonded to form a bonded substrate having a plurality of display regions 31. At this time, the opening 22 of the frame-shaped seal portion 20 constitutes a liquid crystal injection hole 44.

  Next, the bonded substrate having a plurality of display regions 31 is divided at the outer edge of the frame-shaped seal portion 20 formed so as to surround each display region 31 to produce individual bonded substrates.

(Liquid crystal injection process)
Next, a liquid crystal material is injected into the liquid crystal injection hole 44 of the divided bonded substrate by a vacuum injection method. Thereby, the liquid crystal material is filled in the region surrounded by the frame-shaped seal portion 20 in the bonded substrate.

(Liquid crystal injection hole sealing process)
Next, the sealing material 25 is supplied to the liquid crystal injection hole 44 of the bonded substrate filled with the liquid crystal material.

  At this time, the sealing material 25 is supplied so as to fill all of the liquid crystal injection holes 44 as shown in FIG. 5 and further rise outside the edge 50 of the bonded substrate.

  Next, the sealing material 25 is cured by irradiating the supplied sealing material 25 with ultraviolet light.

(Encapsulant supply substrate cutting process)
Next, as shown in FIG. 5, the bonded substrate on which the sealing material 25 has been cured is cut along the edge 50 where the liquid crystal injection hole is formed, and at a dividing line 51 passing over the cured sealing material 25. Divide. In the bonded substrate thus formed, as shown in FIG. 2, the sealing material 25 provided in the liquid crystal injection hole 44 does not protrude outward from the edge 24 of the substrate newly formed by dividing, In addition, the edge 26 of the sealing material 25 and the edge 24 of the substrate constitute the same line.

  Next, the liquid crystal display panel 12 is manufactured using the bonded substrate thus manufactured, and the backlight 13 and the like are further provided on the liquid crystal display panel 12 to complete the liquid crystal display device 10.

  Further, as another embodiment of the method for manufacturing a liquid crystal display device of the present invention, as shown in FIG. 6, a liquid crystal material is left as it is without dividing a large bonded substrate on which a plurality of frame-shaped seal portions 20 are formed. And the sealing material 25 is supplied to the liquid crystal injection hole 44 and then divided into individual bonded substrates at one time. In this case, the cutting at the edge 50 where the liquid crystal injection hole 44 of the bonded substrate is formed is performed along the cutting line 51 along the edge 50 and passing over the cured sealing material 25.

  As described above, the liquid crystal display panel 12 having the plurality of display regions 31 is formed using a large-sized substrate, and the liquid crystal display panel 12 may not be manufactured by dividing the liquid crystal display panel 12. One liquid crystal display panel 12 may be individually manufactured with one glass substrate. Alternatively, a plurality of display regions 31 may be formed in a matrix using a large substrate and then divided into individual bonded substrates.

(Function and effect)
Next, the function and effect will be described.

  The method for manufacturing the liquid crystal display device 10 according to the embodiment of the present invention includes a step of forming a frame-shaped seal portion 20 on the surface of the TFT substrate 40 so that a part of the frame-shaped seal portion 20 is open and extends to the outside of the substrate; A step of forming a bonded substrate having an opening 22 by bonding the CF substrate 35 to the substrate on which the frame-shaped seal portion 20 is formed via the frame-shaped seal portion 20, and the frame-shaped seal portion 20 of the bonded substrate. Supplying a liquid crystal material from the opening 22 to the region, supplying a sealing material 25 to the opening 22 of the bonded substrate to which the liquid crystal material has been supplied, and curing the sealing material 25; And cutting the laminated substrate along a cutting line 51 along the edge 50 where the opening 22 is formed and on the hardened sealing material 25.

  According to such a configuration, after the sealing material 25 is supplied to the liquid crystal injection hole, the bonded substrate is further cut along the edge 50 by the dividing line on the sealing material 25, and thus the opening 22 after the cutting is formed. The sealing material 25 is densely filled and does not protrude outward from the edge 24 of the newly formed substrate. This facilitates assembly of the liquid crystal module. Moreover, the occurrence of liquid crystal leakage from the liquid crystal injection hole can be satisfactorily suppressed.

  In addition, the method for manufacturing the liquid crystal display device 10 according to the embodiment of the present invention is characterized in that the sealing material 25 is formed of an ultraviolet curable material and the sealing material 25 is cured by irradiation with ultraviolet light. To do.

  In order to divide and delete the panel on the sealing material 25 supplied to the liquid crystal injection hole 44, the liquid crystal injection hole 44 must be made deeper by a corresponding amount. For example, the sealing material 25 supplied from the edge 24 of the panel to the deep portion of the liquid crystal injection hole 44 can be cured well.

  Furthermore, in the method of manufacturing the liquid crystal display device 10 according to the embodiment of the present invention, the frame-shaped seal portion 20 surrounds the display area 31 of the TFT substrate, and the openings 22 are on the same edge 50 side of the TFT substrate. A plurality of laminated substrates are formed so as to face each other, and a bonded substrate is cut along a cut line 51 passing over the cured sealing material 25 along an edge 50 in which a plurality of openings 22 formed by a plurality of frame-shaped seal portions 20 are formed. And a step of dividing.

  According to such a configuration, since a large-sized bonded substrate having a plurality of display areas 31 is divided at a parting line 51 at a time, the liquid crystal module can be easily assembled and liquid crystal leakage from the liquid crystal injection hole 44 can be achieved. Thus, the liquid crystal display device 10 capable of satisfactorily suppressing the occurrence of the above can be efficiently manufactured.

  A liquid crystal display device 10 according to an embodiment of the present invention includes a TFT substrate 14 and a CF substrate 15 bonded together via a liquid crystal layer 21 and a frame-shaped seal portion 20 provided so as to surround the liquid crystal layer 21. In the liquid crystal display device 10, the frame-shaped seal portion 20 is formed so that a part thereof opens to reach the edge 24 of the TFT substrate 14 and the CF substrate 15. 25, and the sealing material 25 does not protrude outward from the edge 24 of the TFT substrate 14 and the CF substrate 15.

  According to such a configuration, the liquid crystal injection hole 44 is filled with the sealing material 25 and the sealing material 25 does not protrude outward from the edge 24 of the TFT substrate 14 and the CF substrate 15. Assembling becomes easy. In addition, occurrence of liquid crystal leakage from the liquid crystal injection hole 44 can be satisfactorily suppressed.

  As described above, the present invention is useful for the method of manufacturing the liquid crystal display device 10 and the liquid crystal display device 10.

1 is a cross-sectional view of a liquid crystal display device 10 according to an embodiment of the present invention. 3 is an enlarged view of the vicinity of an opening 22 of the frame-shaped seal portion 20. FIG. 3 is a plan view of a large CF substrate 35. FIG. 2 is a plan view of a large-sized TFT substrate 40. FIG. 5 is a plan view of a bonded substrate in which a sealing material 25 is supplied to a liquid crystal injection hole 44. FIG. It is a top view of the bonding board | substrate which supplied the sealing material 25 to the liquid crystal injection hole 44 which concerns on other embodiment of this invention. It is an enlarged view near the liquid crystal injection hole 102 of a conventional general liquid crystal display panel.

Explanation of symbols

10 Liquid crystal display device
12 LCD panel
14,40 TFT substrate
15,35 CF substrate
20 Frame seal
21 Liquid crystal layer
22 opening
24, 26, 50 edges
25 Sealing material
30 Shading area
31 display area
36, 41 Display element non-formation region
44 Liquid crystal injection hole
51 Broken line

Claims (4)

Forming a frame-shaped seal portion on the surface of the transparent first substrate so that a part of the frame-shaped seal portion is open and extends to the outside of the first substrate;
Forming a bonded substrate having an opening by bonding a transparent second substrate to the first substrate on which the frame-shaped seal portion is formed, via the frame-shaped seal portion;
Supplying a liquid crystal material from the opening to a region surrounded by the frame-shaped seal portion of the bonded substrate;
Supplying and curing a sealing material to the opening of the bonded substrate to which the liquid crystal material has been supplied; and
Cutting the bonded substrate on which the sealing material has been cured, along a cutting line along the edge where the opening is formed and passing over the cured sealing material;
A method for manufacturing a liquid crystal display device comprising: In the manufacturing method of the liquid crystal display device described in Claim 1,
The sealing material is formed of an ultraviolet curable material,
A method for manufacturing a liquid crystal display device, wherein the sealing material is cured by ultraviolet light irradiation. In the manufacturing method of the liquid crystal display device described in Claim 1,
A plurality of the frame-shaped seal portions are respectively formed so as to surround predetermined regions of the first substrate and the openings thereof face the same edge side of the first substrate, and
Cutting the bonded substrate at a dividing line passing over the cured sealing material along an edge formed with a plurality of openings formed by the plurality of frame-shaped seal portions; and
A method for manufacturing a liquid crystal display device comprising: A liquid crystal display device having first and second substrates bonded together through a liquid crystal material and a frame-shaped seal portion provided so as to surround the liquid crystal material,
The frame-shaped seal portion is formed so that a part thereof is opened and reaches the edges of the first and second substrates,
A liquid crystal display device in which the opening is filled with a sealing material, and the sealing material does not protrude outward from the edges of the first and second substrates.

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