KR20140031020A - Bending method of liquid crystal display device - Google Patents

Abstract

In the present invention, disclosed is a bending method of a liquid crystal display device. The disclosed bending method of the liquid crystal display device includes: an attaching step of forming a liquid crystal panel by injecting a liquid crystal between a top substrate and a bottom substrate and combining a polarization film with both sides of a liquid crystal cell with a preset thickness; a bending step of bending the liquid crystal panel into a curved shape after the attaching step; a heating step of heating the surface of the liquid crystal panel to soften the polarization film; and a cooling step of cooling the polarization film which is softened after the heating step. [Reference numerals] (S0-1) Inject a liquid crystal panel; (S0-2) Remove a polarization film; (S0-3) Etch a liquid crystal cell; (S1) Attach the polarization film; (S2) Finish the edge of the liquid crystal panel; (S3) Bend; (S4) Heat; (S5) Cool; (S6) Separate a jig; (S7) Combine a frame

Description

Bending method of liquid crystal display device {BENDING METHOD OF LIQUID CRYSTAL DISPLAY DEVICE}

The present invention relates to a bending method of a liquid crystal display device, and more particularly, an ultra-thin configuration, which simplifies the assembling process of a liquid crystal panel bent to a desired curved shape, facilitates alignment of the bent liquid crystal panel and a frame, and a bending stress on the liquid crystal panel. The present invention relates to a bending method of a liquid crystal display device that can prevent a liquid crystal panel from being damaged when an external force such as vibration, shock, or the like is applied.

In general, a liquid crystal panel (LCD panel) of a liquid crystal display (LCD) includes a liquid crystal having dielectric anisotropy between an upper substrate and a lower substrate. The desired image is obtained by applying an electric field to the liquid crystal and adjusting the intensity of the electric field to adjust the transmittance of light passing through the liquid crystal.

Such liquid crystal display devices are typical among portable flat panel displays (FPDs) that are easy to carry. Among them, TFT-LCDs using thin film transistors (TFTs) as switching elements are mainly used.

Since the liquid crystal panel is generally manufactured in a flat form, when a curved display is required, a conventional flat liquid crystal panel cannot be used.

In order to solve this problem, technology development of a flexible liquid crystal panel using a plastic substrate instead of the glass substrate of the conventional liquid crystal panel has been developed, but there was a problem that cannot cope with large size and high resolution. For this reason, the technology development of curved liquid crystal panel capable of coping with large size and high resolution by reprocessing a liquid crystal panel using a conventional glass substrate has been developed.

However, when reprocessing a liquid crystal panel to which a conventional glass substrate is applied, a rectangular flat polarizing film is attached to an ultra thin liquid crystal cell made by thinning a glass substrate to form a flat ultra thin liquid crystal panel, and the flat ultra thin liquid crystal panel is curved. In the assembling process, it is difficult to uniformly bend, thereby increasing the possibility of defects such as orientation unevenness and cell gap staining, and easily bending becomes difficult, resulting in the possibility of defects such as breakage during bending.

Related prior art is Korean Patent Publication No. 2011-0030732 (2011. 03. 24. Publication, the name of the invention: curved display panel manufacturing method).

According to the present invention, an ultra-thin configuration simplifies the process of assembling a liquid crystal panel bent to a desired curved shape, aligns a curved liquid crystal panel with a frame, and when an external force such as bending stress, vibration, or impact is applied to the liquid crystal panel, An object of the present invention is to provide a bending method of a liquid crystal display device that can prevent damage.

Bending method of the liquid crystal display device according to the present invention comprises the attachment step of forming a liquid crystal panel by injecting a liquid crystal between the upper substrate and the lower substrate and combining the polarizing film on both sides of the liquid crystal cell having a predetermined thickness; Bending the liquid crystal panel that has undergone the attaching step into a curved shape; A heating step of heating the surface of the liquid crystal panel to soften the polarizing film; And a cooling step of cooling the polarized film softened through the heating step. And a control unit.

In addition, when using the jig corresponding to the curved shape in the bending step, the separation step of separating the jig from the liquid crystal panel after the cooling step; And further comprising:

In addition, the coupling step of coupling the frame portion on each side of the liquid crystal panel after the cooling step; And further comprising:

In addition, the frame portion, the separation prevention portion for supporting the end of the liquid crystal panel; Is provided.

In addition, the thickness of the polarizing film coupled to the liquid crystal cell through the attachment step is characterized in that the same as or larger than the thickness of the liquid crystal cell.

In addition, a thin plate manufacturing step of reducing the liquid crystal cell to a predetermined thickness prior to the attaching step; And further comprising:

In addition, the thin plate manufacturing step, the import step of bringing in the liquid crystal cell; An etching step of shaving the upper substrate and the lower substrate of the liquid crystal cell so that the liquid crystal cell is reduced to a predetermined thickness; And a control unit.

In addition, the thin plate manufacturing step, if the polarizing film is coupled to the liquid crystal cell passed through the carrying-in step, the removing step of removing the polarizing film from the liquid crystal cell imported through the carrying-in step; And a control unit.

In addition, the finishing step of wrapping the edge of the liquid crystal panel after the attachment step; Is further included.

The bending method of the liquid crystal display device according to the present invention is configured to be ultra-thin to simplify the process of assembling the liquid crystal panel bent to the desired curved shape, the alignment of the bent liquid crystal panel and the frame is simplified, such as bending stress, vibration, impact, etc. When an external force is applied, the liquid crystal panel can be prevented from being damaged.

In addition, the present invention can improve bending uniformity and bending ease.

In addition, the present invention can reduce or eliminate the possibility of defects, such as uneven alignment or cell gap staining in the liquid crystal panel.

1 is a cross-sectional view schematically showing a liquid crystal display device according to a first embodiment of the present invention;
2 is a cross-sectional view schematically showing a liquid crystal display device according to a second embodiment of the present invention;
3 is a cross-sectional view schematically showing a liquid crystal display device according to a third embodiment of the present invention;
4 is a cross-sectional view schematically showing a liquid crystal display device according to a fourth embodiment of the present invention;
5 is a cross-sectional view schematically showing a liquid crystal display device according to a fifth embodiment of the present invention;
6 is a flowchart illustrating a bending method of a liquid crystal display device according to an embodiment of the present invention;
7 is a cross-sectional view illustrating a liquid crystal display device manufactured by a bending method according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of a bending method of the liquid crystal display device according to the present invention. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

In describing the present invention, the liquid crystal panel 10 refers to a liquid crystal cell 20 having a polarizing film 30 coupled to both surfaces thereof, and the liquid crystal cell 20 is disposed between the upper substrate 21 and the lower substrate 23. It refers to a substrate module in which the liquid crystal 25 is injected.

In addition, the thickness means a length along the stacking direction of the liquid crystal cell 20 and the polarizing film 30. In the figure, t0 is the thickness of the liquid crystal panel 10, t1 is the thickness of the upper substrate 21, t2 is the thickness of the lower substrate 23, t3 is between the upper substrate 21 and the lower substrate 23 The thickness of the liquid crystal 25 at intervals.

1 is a cross-sectional view schematically showing a liquid crystal display device according to a first embodiment of the present invention.

Referring to FIG. 1, the liquid crystal display device according to the first embodiment of the present invention includes a liquid crystal cell 20, a polarizing film 30, and a finish portion 40.

The liquid crystal cell 20 is a substrate module in which the liquid crystal 25 is injected between the upper substrate 21 and the lower substrate 23. The liquid crystal cell 20 is ultra thin and has a predetermined thickness. Here, the upper substrate 21 and the lower substrate 23 may be made of a transparent material. In addition, the upper substrate 21 and the lower substrate 23 may be made of a glass material.

The liquid crystal cell 20 may be cut out so that the upper substrate 21 and the lower substrate 23 have a predetermined thickness and may be configured to be ultra-thin. In addition, the liquid crystal cell 20 may be configured to be ultra-thin by injecting the liquid crystal 25 between the upper substrate 21 having a predetermined thickness and the lower substrate 23 having a predetermined thickness. Here, the ultra-thin liquid crystal cell 20 may be bent to a desired curved shape, thereby implementing a desired curved liquid crystal display device. At this time, minute cracks remain on the surface of the ultra-thin liquid crystal cell 20.

The preset thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 1.0 mm or less. More specifically, the thickness t0 of the predetermined liquid crystal cell 20 may be 0.1 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.5 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.8 mm or less.

In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.5 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.8 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 1.0 mm or less. Here, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.5 mm or less. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.4 mm or less. In addition, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.2 mm or less, respectively. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.25 mm or less, respectively.

When the thickness becomes smaller than the lower limit of the thicknesses t0, t1, and t2, fine cracks are formed on the surface of the liquid crystal cell 20 or cracks remaining on the surface of the liquid crystal cell 20 in the process of bending the liquid crystal cell 20. The radio wave may be spread, and the liquid crystal cell 20 may be damaged eventually. In addition, when the thickness becomes larger than the upper limit of the thicknesses t0, t1, and t2, it becomes difficult to bend the liquid crystal cell 20 to a desired curved shape. Therefore, by limiting the thicknesses t0, t1, and t2 of the liquid crystal cell 20, when bending the ultra-thin liquid crystal cell 20, it prevents the propagation of cracks remaining on the surface of the liquid crystal cell 20 as well as the ultra-thin shape. It is possible to prevent the liquid crystal cell 20 from being damaged and to bend the ultra-thin liquid crystal cell 20 to a desired curved shape.

The polarizing film 30 is a film that can pass or block vertical or horizontal polarization of incident light, and is respectively bonded to both sides of the liquid crystal cell 20. Here, the polarizing film 30 may be divided into a first polarizing film 31 coupled to one side of the liquid crystal cell 20 and a second polarizing film 32 coupled to the other side of the liquid crystal cell 20.

By bonding the polarizing film 30 to both surfaces of the liquid crystal cell 20, it is possible to prevent the liquid crystal cell 20 from being damaged from cracks remaining on both surfaces of the liquid crystal cell 20. Here, when the thickness of the polarizing film 30 is equal to or larger than the thickness t1 of the upper substrate 21 or the thickness t2 of the lower substrate 23, when the liquid crystal cell 20 is bent in a desired curved shape. The curved shape of the liquid crystal cell 20 can be stably supported, and the liquid crystal cell 20 can be protected.

The finish portion 40 is coupled to at least one of the liquid crystal cell 20 and the polarizing film 30 so as to surround the edge of the liquid crystal cell 20. In the first embodiment of the present invention, the finishing portion 40 extends from the edge of the polarizing film 30 to be the same as the edge of the liquid crystal cell 20 to the film extending portion 41 coupled to the liquid crystal cell 20. It is composed. By providing the film extension part 41, it can finally prevent that the liquid crystal cell 20 is damaged from the crack which remains on both surfaces of the liquid crystal cell 20. FIG.

The liquid crystal display device according to the second embodiment of the present invention will now be described.

2 is a cross-sectional view schematically showing a liquid crystal display device according to a second embodiment of the present invention.

2, a liquid crystal display device according to a second embodiment of the present invention includes a liquid crystal cell 20, a polarizing film 30, and a finish portion 40.

The liquid crystal cell 20 is a substrate module in which the liquid crystal 25 is injected between the upper substrate 21 and the lower substrate 23. The liquid crystal cell 20 is ultra thin and has a predetermined thickness. Here, the upper substrate 21 and the lower substrate 23 may be made of a transparent material. In addition, the upper substrate 21 and the lower substrate 23 may be made of a glass material. The liquid crystal cell 20 is scraped so that the upper substrate 21 and the lower substrate 23 have a predetermined thickness to form an ultra thin shape. In addition, the liquid crystal cell 20 may be configured to be ultra-thin by injecting the liquid crystal 25 between the upper substrate 21 and the lower substrate 23 having a predetermined thickness. Here, the ultra-thin liquid crystal cell 20 can be implemented by bending a curved display device. At this time, minute cracks remain on the surface of the ultra-thin liquid crystal cell 20.

The preset thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 1.0 mm or less. More specifically, the thickness t0 of the predetermined liquid crystal cell 20 may be 0.1 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.5 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.8 mm or less.

In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.5 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.8 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 1.0 mm or less. Here, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.5 mm or less. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.4 mm or less. In addition, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.2 mm or less, respectively. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.25 mm or less, respectively.

When the thickness becomes smaller than the lower limit of the thicknesses t0, t1, and t2, fine cracks are formed on the surface of the liquid crystal cell 20 or cracks remaining on the surface of the liquid crystal cell 20 in the process of bending the liquid crystal cell 20. The radio wave may be spread, and the liquid crystal cell 20 may be damaged eventually. In addition, when the thickness becomes larger than the upper limit of the thicknesses t0, t1, and t2, it becomes difficult to bend the liquid crystal cell 20 to a desired curved shape. Therefore, by limiting the thicknesses t0, t1, and t2 of the liquid crystal cell 20, when bending the ultra-thin liquid crystal cell 20, it prevents the propagation of cracks remaining on the surface of the liquid crystal cell 20 as well as the ultra-thin shape. It is possible to prevent the liquid crystal cell 20 from being damaged and to bend the ultra-thin liquid crystal cell 20 to a desired curved shape.

The polarizing film 30 is a film that can pass or block vertical or horizontal polarization of incident light, and is respectively bonded to both sides of the liquid crystal cell 20.

Here, the polarizing film 30 may be divided into a first polarizing film 31 coupled to one side of the liquid crystal cell 20 and a second polarizing film 32 coupled to the other side of the liquid crystal cell 20. By bonding the polarizing film 30 to both surfaces of the liquid crystal cell 20, it is possible to prevent the liquid crystal cell 20 from being damaged from cracks remaining on both surfaces of the liquid crystal cell 20. Here, when the thickness of the polarizing film 30 is equal to or larger than the thickness t1 of the upper substrate 21 or the thickness t2 of the lower substrate 23, when the liquid crystal cell 20 is bent in a desired curved shape. The curved shape of the liquid crystal cell 20 can be stably supported, and the liquid crystal cell 20 can be protected.

The finish portion 40 is coupled to at least one of the liquid crystal cell 20 and the polarizing film 30 so as to surround the edge of the liquid crystal cell 20. The finishing part 40 according to the second embodiment of the present invention includes a film extending part 41 extending from the edge of the polarizing film 30 so as to protrude from the edge of the liquid crystal cell 20. Here, the film extension 41 is formed to protrude from the edge of the liquid crystal cell 20 by the finishing width (L). Here, the closing width (L) is made of 2mm or less, when the frame portion 50 (see Fig. 7) is coupled to the liquid crystal panel 10, the polarizing film 30 and the frame portion 50 (see Fig. 7) Interference can be prevented. When the finishing width L is larger than 2 mm, the film extension part 41 interferes with the frame part 50 (see FIG. 7), thereby degrading coupling stability between the liquid crystal panel 10 and the frame part 50 (see FIG. 7). In addition, the propagation of cracks remaining in the liquid crystal cell 20 may be diffused in the spaced space between the film extension parts 41. By providing the film extension part 41, it can finally prevent that the liquid crystal cell 20 is damaged from the crack which remains on both surfaces of the liquid crystal cell 20. FIG.

The liquid crystal display device according to the third embodiment of the present invention will now be described.

3 is a cross-sectional view schematically showing a liquid crystal display device according to a third embodiment of the present invention.

Referring to FIG. 3, the liquid crystal display device according to the third embodiment of the present invention includes a liquid crystal cell 20, a polarizing film 30, and a finish portion 40.

The liquid crystal cell 20 is a substrate module in which the liquid crystal 25 is injected between the upper substrate 21 and the lower substrate 23. The liquid crystal cell 20 is ultra thin and has a predetermined thickness. Here, the upper substrate 21 and the lower substrate 23 may be made of a transparent material. In addition, the upper substrate 21 and the lower substrate 23 may be made of a glass material. The liquid crystal cell 20 is scraped so that the upper substrate 21 and the lower substrate 23 have a predetermined thickness to form an ultra thin shape. In addition, the liquid crystal cell 20 may be configured to be ultra-thin by injecting the liquid crystal 25 between the upper substrate 21 and the lower substrate 23 having a predetermined thickness. Here, the ultra-thin liquid crystal cell 20 can be implemented by bending a curved display device. At this time, minute cracks remain on the surface of the ultra-thin liquid crystal cell 20.

The preset thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 1.0 mm or less. More specifically, the thickness t0 of the predetermined liquid crystal cell 20 may be 0.1 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.5 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.8 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.5 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.8 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 1.0 mm or less. Here, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.5 mm or less. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.4 mm or less. In addition, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.2 mm or less, respectively. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.25 mm or less, respectively. When the thickness becomes smaller than the lower limit of the thicknesses t0, t1, and t2, fine cracks are formed on the surface of the liquid crystal cell 20 or cracks remaining on the surface of the liquid crystal cell 20 in the process of bending the liquid crystal cell 20. The radio wave may be spread, and the liquid crystal cell 20 may be damaged eventually. In addition, when the thickness becomes larger than the upper limit of the thicknesses t0, t1, and t2, it becomes difficult to bend the liquid crystal cell 20 to a desired curved shape. Therefore, by limiting the thicknesses t0, t1, and t2 of the liquid crystal cell 20, when bending the ultra-thin liquid crystal cell 20, it prevents the propagation of cracks remaining on the surface of the liquid crystal cell 20 as well as the ultra-thin shape. It is possible to prevent the liquid crystal cell 20 from being damaged and to bend the ultra-thin liquid crystal cell 20 to a desired curved shape.

The polarizing film 30 is a film that can pass or block vertical or horizontal polarization of incident light, and is respectively bonded to both sides of the liquid crystal cell 20. Here, the polarizing film 30 may be divided into a first polarizing film 31 coupled to one side of the liquid crystal cell 20 and a second polarizing film 32 coupled to the other side of the liquid crystal cell 20. By bonding the polarizing film 30 to both surfaces of the liquid crystal cell 20, it is possible to prevent the liquid crystal cell 20 from being damaged from cracks remaining on both surfaces of the liquid crystal cell 20. Here, when the thickness of the polarizing film 30 is equal to or larger than the thickness t1 of the upper substrate 21 or the thickness t2 of the lower substrate 23, when the liquid crystal cell 20 is bent in a desired curved shape. The curved shape of the liquid crystal cell 20 can be stably supported, and the liquid crystal cell 20 can be protected.

The finish portion 40 is coupled to at least one of the liquid crystal cell 20 and the polarizing film 30 so as to surround the edge of the liquid crystal cell 20. In the third embodiment of the present invention, the finishing part 40 is composed of a film extending part 41 and the molding part 43. The film extension part 41 extends from the edge of the polarizing film 30 so as to be the same as the edge of the liquid crystal cell 20 and is coupled to the liquid crystal cell 20, and the molding part 43 is an edge of the liquid crystal cell 20. And a side surface of the liquid crystal cell 20 and at least a side surface of the polarizing film 30 so as to surround the edge of the polarizing film 30.

The molding part 43 may include at least one of an adhesive, an adhesive tape, a sealing material, and a glass composition. Here, the molding part 43 may be formed of an adhesive applied to the side of the liquid crystal cell 20 and the side of the polarizing film 30. In addition, the molding part 43 may be formed of an adhesive tape attached to at least the side of the liquid crystal cell 20 of the side of the liquid crystal cell 20 and the side of the polarizing film 30. In addition, the molding part 43 may prevent the leakage of the liquid crystal 25 and may be formed of a sealing material for fixing the upper substrate 21 and the lower substrate 23 apart from each other. In addition, the molding part 43 may be formed of a glass composition of the same material as the upper substrate 21 or the lower substrate 23. By providing the film extension part 41 and the molding part 43, the side surface of the liquid crystal cell 20 is sealed to finally prevent the liquid crystal cell 20 from being damaged from cracks remaining on both sides of the liquid crystal cell 20. can do.

The liquid crystal display device according to the fourth embodiment of the present invention will now be described.

4 is a cross-sectional view schematically illustrating a liquid crystal display device according to a fourth embodiment of the present invention.

Referring to FIG. 4, the liquid crystal display device according to the fourth embodiment of the present invention includes a liquid crystal cell 20, a polarizing film 30, and a finish portion 40.

The liquid crystal cell 20 is a substrate module in which the liquid crystal 25 is injected between the upper substrate 21 and the lower substrate 23. The liquid crystal cell 20 is ultra thin and has a predetermined thickness. Here, the upper substrate 21 and the lower substrate 23 may be made of a transparent material. In addition, the upper substrate 21 and the lower substrate 23 may be made of a glass material. The liquid crystal cell 20 is scraped so that the upper substrate 21 and the lower substrate 23 have a predetermined thickness to form an ultra thin shape. In addition, the liquid crystal cell 20 may be configured to be ultra-thin by injecting the liquid crystal 25 between the upper substrate 21 and the lower substrate 23 having a predetermined thickness. Here, the ultra-thin liquid crystal cell 20 can be implemented by bending a curved display device. At this time, minute cracks remain on the surface of the ultra-thin liquid crystal cell 20. The preset thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 1.0 mm or less. More specifically, the thickness t0 of the predetermined liquid crystal cell 20 may be 0.1 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.5 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.8 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.5 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.8 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 1.0 mm or less. Here, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.5 mm or less. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.4 mm or less. In addition, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.2 mm or less, respectively. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.25 mm or less, respectively. When the thickness becomes smaller than the lower limit of the thicknesses t0, t1, and t2, fine cracks are formed on the surface of the liquid crystal cell 20 or cracks remaining on the surface of the liquid crystal cell 20 in the process of bending the liquid crystal cell 20. The radio wave may be spread, and the liquid crystal cell 20 may be damaged eventually. In addition, when the thickness becomes larger than the upper limit of the thicknesses t0, t1, and t2, it becomes difficult to bend the liquid crystal cell 20 to a desired curved shape. Therefore, by limiting the thicknesses t0, t1, and t2 of the liquid crystal cell 20, when bending the ultra-thin liquid crystal cell 20, it prevents the propagation of cracks remaining on the surface of the liquid crystal cell 20 as well as the ultra-thin shape. It is possible to prevent the liquid crystal cell 20 from being damaged and to bend the ultra-thin liquid crystal cell 20 to a desired curved shape.

The polarizing film 30 is a film that can pass or block vertical or horizontal polarization of incident light, and is respectively bonded to both sides of the liquid crystal cell 20. Here, the polarizing film 30 may be divided into a first polarizing film 31 coupled to one side of the liquid crystal cell 20 and a second polarizing film 32 coupled to the other side of the liquid crystal cell 20. By bonding the polarizing film 30 to both surfaces of the liquid crystal cell 20, it is possible to prevent the liquid crystal cell 20 from being damaged from cracks remaining on both surfaces of the liquid crystal cell 20. Here, when the thickness of the polarizing film 30 is equal to or larger than the thickness t1 of the upper substrate 21 or the thickness t2 of the lower substrate 23, when the liquid crystal cell 20 is bent in a desired curved shape. The curved shape of the liquid crystal cell 20 can be stably supported, and the liquid crystal cell 20 can be protected.

The finish portion 40 is coupled to at least one of the liquid crystal cell 20 and the polarizing film 30 so as to surround the edge of the liquid crystal cell 20. In the fourth embodiment of the present invention, the finishing part 40 is composed of a film extending part 41 and a molding part 43. The film extension part 41 extends from the edge of the polarizing film 30 so as to protrude from the edge of the liquid crystal cell 20, and the molding part 43 is the edge of the liquid crystal cell 20 and the edge of the polarizing film 30. It is coupled to at least the side of the liquid crystal cell 20 of the side of the liquid crystal cell 20 and the side of the polarizing film 30 so as to surround the. Here, the film extension 41 is formed to protrude from the edge of the liquid crystal cell 20 by the finishing width (L). Here, the closing width (L) is made of 2mm or less, when the frame portion 50 (see Fig. 7) is coupled to the liquid crystal panel 10, the polarizing film 30 and the frame portion 50 (see Fig. 7) Interference can be prevented. When the finishing width L is larger than 2 mm, the film extension part 41 interferes with the frame part 50 (see FIG. 7), thereby degrading coupling stability between the liquid crystal panel 10 and the frame part 50 (see FIG. 7). In this case, the propagation of cracks remaining in the liquid crystal cell 20 in the spaced space between the film extension parts 41 may be diffused.

The molding part 43 may include at least one of an adhesive, an adhesive tape, a sealing material, and a glass composition. Here, the molding part 43 may be formed of an adhesive applied to the side of the liquid crystal cell 20 and the side of the polarizing film 30. In addition, the molding part 43 may be formed of an adhesive tape attached to at least the side of the liquid crystal cell 20 of the side of the liquid crystal cell 20 and the side of the polarizing film 30. In addition, the molding part 43 may prevent the leakage of the liquid crystal 25 and may be formed of a sealing material for fixing the upper substrate 21 and the lower substrate 23 apart from each other. In addition, the molding part 43 may be formed of a glass composition of the same material as the upper substrate 21 or the lower substrate 23. By providing the film extension part 41 and the molding part 43, the side surface of the liquid crystal cell 20 is sealed to finally prevent the liquid crystal cell 20 from being damaged from cracks remaining on both sides of the liquid crystal cell 20. can do.

The liquid crystal display device according to the fifth embodiment of the present invention will now be described.

5 is a cross-sectional view schematically illustrating a liquid crystal display device according to a fifth embodiment of the present invention.

Referring to FIG. 5, the liquid crystal display device according to the fifth embodiment of the present invention includes a liquid crystal cell 20, a polarizing film 30, and a finish portion 40.

The liquid crystal cell 20 is a substrate module in which the liquid crystal 25 is injected between the upper substrate 21 and the lower substrate 23. The liquid crystal cell 20 is ultra thin and has a predetermined thickness. Here, the upper substrate 21 and the lower substrate 23 may be made of a transparent material. In addition, the upper substrate 21 and the lower substrate 23 may be made of a glass material. The liquid crystal cell 20 is scraped so that the upper substrate 21 and the lower substrate 23 have a predetermined thickness to form an ultra thin shape. In addition, the liquid crystal cell 20 may be configured to be ultra-thin by injecting the liquid crystal 25 between the upper substrate 21 and the lower substrate 23 having a predetermined thickness. Here, the ultra-thin liquid crystal cell 20 can be implemented by bending a curved display device. At this time, minute cracks remain on the surface of the ultra-thin liquid crystal cell 20.

The preset thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 1.0 mm or less. More specifically, the thickness t0 of the predetermined liquid crystal cell 20 may be 0.1 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.5 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.1 mm or more and 0.8 mm or less.

In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.4 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.5 mm or less. In addition, the predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 0.8 mm or less. The predetermined thickness t0 of the liquid crystal cell 20 may be 0.2 mm or more and 1.0 mm or less. Here, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.5 mm or less. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be each 0.1 mm or more and 0.4 mm or less. In addition, the thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.2 mm or less, respectively. The thicknesses t1 and t2 of the upper substrate 21 and the lower substrate 23 may be 0.05 mm or more and 0.25 mm or less, respectively. When the thickness becomes smaller than the lower limit of the thicknesses t0, t1, and t2, fine cracks are formed on the surface of the liquid crystal cell 20 or cracks remaining on the surface of the liquid crystal cell 20 in the process of bending the liquid crystal cell 20. The radio wave may be spread, and the liquid crystal cell 20 may be damaged eventually. In addition, when the thickness becomes larger than the upper limit of the thicknesses t0, t1, and t2, it becomes difficult to bend the liquid crystal cell 20 to a desired curved shape. Therefore, by limiting the thicknesses t0, t1, and t2 of the liquid crystal cell 20, when bending the ultra-thin liquid crystal cell 20, it prevents the propagation of cracks remaining on the surface of the liquid crystal cell 20 as well as the ultra-thin shape. It is possible to prevent the liquid crystal cell 20 from being damaged and to bend the ultra-thin liquid crystal cell 20 to a desired curved shape.

The polarizing film 30 is a film that can pass or block vertical or horizontal polarization of incident light, and is respectively bonded to both sides of the liquid crystal cell 20. Here, the polarizing film 30 may be divided into a first polarizing film 31 coupled to one side of the liquid crystal cell 20 and a second polarizing film 32 coupled to the other side of the liquid crystal cell 20. By bonding the polarizing film 30 to both surfaces of the liquid crystal cell 20, it is possible to prevent the liquid crystal cell 20 from being damaged from cracks remaining on both surfaces of the liquid crystal cell 20. Here, when the thickness of the polarizing film 30 is equal to or larger than the thickness t1 of the upper substrate 21 or the thickness t2 of the lower substrate 23, when the liquid crystal cell 20 is bent in a desired curved shape. The curved shape of the liquid crystal cell 20 can be stably supported, and the liquid crystal cell 20 can be protected.

The finish portion 40 is coupled to at least the liquid crystal cell 20 of the liquid crystal cell 20 and the polarizing film 30 so as to surround the edge of the liquid crystal cell 20. In the fifth exemplary embodiment of the present invention, the finishing part 40 includes at least one of the side of the liquid crystal cell 20 and the side of the polarizing film 30 so as to surround the edge of the liquid crystal cell 20 and the edge of the polarizing film 30. It is composed of a molding unit 43 coupled to one.

The molding part 43 may include at least one of an adhesive, an adhesive tape, a sealing material, and a glass composition. Here, the molding part 43 may be formed of an adhesive applied to the side of the liquid crystal cell 20 and the side of the polarizing film 30. In addition, the molding part 43 may be formed of an adhesive tape attached to at least the side of the liquid crystal cell 20 of the side of the liquid crystal cell 20 and the side of the polarizing film 30. In addition, the molding part 43 may prevent the leakage of the liquid crystal 25 and may be formed of a sealing material for fixing the upper substrate 21 and the lower substrate 23 apart from each other. In addition, the molding part 43 may be formed of a glass composition of the same material as the upper substrate 21 or the lower substrate 23. By providing the molding part 43, the edge of the liquid crystal cell 20 may be sealed to finally prevent the liquid crystal cell 20 from being damaged from cracks remaining on both sides of the liquid crystal cell 20.

Hereinafter, a bending method of the liquid crystal display device according to an embodiment of the present invention will be described.

6 is a flow chart showing a bending method of the liquid crystal display device according to an embodiment of the present invention, Figure 7 is a cross-sectional view showing a liquid crystal display device manufactured by the bending method according to an embodiment of the present invention.

6 and 7, a bending method of a liquid crystal display device according to an embodiment of the present invention includes an attaching step S1, a bending step S3, a heating step S4, and a cooling step S5. It includes.

In the attaching step S1, the liquid crystal 25 is injected between the upper substrate 21 and the lower substrate 23, and the polarizing film 30 is coupled to both surfaces of the liquid crystal cell 20 having a predetermined thickness.

The coupling structure of the liquid crystal cell 20 and the polarizing film 30 may form a coupling structure disclosed in the above-described liquid crystal display device.

In the bending step S3, the liquid crystal cell 20 to which the polarizing film 30 is coupled is bent in a desired curved shape. In the bending step S3, a jig (not shown) corresponding to the curved shape may be used.

In the bending step S3, the curved shape may be bent to a shape desired by the user.

The heating step S4 heats the surface of the bent liquid crystal cell 20 so that the polarizing film 30 is softened. In the heating step S4, the heating temperature of the liquid crystal cell 20 is 60 degrees Celsius or more and 100 degrees Celsius or less.

By limiting the heating temperature of the liquid crystal cell 20, softening of the polarizing film 30 is easy, plastic deformation of the polarizing film 30 can be prevented, and polarization of the polarizing film 30 can be prevented from being deformed. Can be.

Here, when the heating temperature is less than the lower limit, productivity may be reduced by increasing the time required for the polarizing film 30 to soften or increasing the polarizing film 30.

In addition, when the heating temperature is greater than the upper limit, it is difficult to control the time required to soften the polarizing film 30, and the polarizing film 30 is plastically deformed to lose the properties of the polarizing film 30.

The heating step S4 is to soften the polarizing film 30, and the upper substrate 21 and the lower substrate 23 are not softened in the liquid crystal cell 20.

The order of the bending step S3 and the heating step S4 is not limited thereto, but the bending step S3 and the heating step S4 are simultaneously performed or the bending step S3 and the heating step S4 are sequentially performed. It is advantageous.

When the heating step S4 is prioritized over the bending step S3, a separate means for preventing cooling of the softened polarizing film 30 may be necessary.

The cooling step S5 cools the softened polarizing film 30 through the heating step S4.

The cooling step may stop the heating step S4 and cool the polarizing film 30 softened by natural convection. In addition, the cooling step S5 may stop the heating step S4 and spray cold air to cool the softened polarizing film 30.

The polarizing film 30 cooled through the cooling step S5 maintains the same shape as the curved surface of the liquid crystal cell 20.

As described above, the liquid crystal cell 20 is bent in a desired curved shape in a state in which the polarizing film 30 is attached to both surfaces of the liquid crystal cell 20, the polarizing film 30 is heated to soften, and then cooled, thereby the polarizing film 30. ) Is maintained in the same shape as the curved shape of the liquid crystal cell 20, the liquid crystal cell 20 can maintain the curved shape by the curved surface of the polarizing film.

Bending method of the liquid crystal display device according to an embodiment of the present invention may further include a separation step (S6).

In the separating step S6, when a jig (not shown) is used in the bending step S3, the jig (not shown) is separated from the liquid crystal cell 20 that has undergone the cooling step S5. Although the jig (not shown) is separated through the separation step S6, the liquid crystal cell 20 maintains a curved shape by the cooled polarizing film 30.

Bending method of the liquid crystal display device according to an embodiment of the present invention may further comprise a bonding step (S7).

In the coupling step S7, the frame part 50 having a predetermined curved shape is coupled to the upper side and the lower side of the liquid crystal cell 20 which have undergone the cooling step S5 or the separating step S6.

Through the coupling step (S7) to finally complete the liquid crystal display device having a desired curved shape.

Accordingly, the above-described liquid crystal display device may further include a frame portion 50 as shown in FIG. The frame part 50 has a predetermined curved shape and is coupled to both surfaces of the liquid crystal panel 10, respectively. The frame part 50 is respectively coupled to the polarizing film 30 of the liquid crystal panel 10. The frame part 50 may have a predetermined curved shape corresponding to the curved shape of the liquid crystal panel 10.

Here, although the curvature of the liquid crystal panel 10 having a curved shape through the above-described bending method is preferably formed to be substantially the same as the curvature of the frame part 50, the curvature of the liquid crystal panel 10 is the frame part 50. May be greater than or less than the curvature of.

Here, the departure prevention unit 51 may be formed in the frame unit 50.

The separation preventing unit 51 is provided in the frame unit 50 (see FIG. 7) to support an end portion of the liquid crystal panel 10 to be coupled thereto. The departure preventing unit 51 suppresses or prevents the liquid crystal panel 10 from flowing in the circumferential direction with respect to the virtual circle corresponding to the curved shape of the liquid crystal panel 10 to be coupled.

The separation prevention unit 51 may extend from the frame unit 50.

On the other hand, the separation prevention part 51 may be coupled to the edge of the frame portion 50 made of a separate member. For example, the separation prevention part 51 may be made of a tape, and may be coupled to the edge of the frame part 50 through an adhesive applied to the edge of the tape or the frame part 50.

Bending method of the liquid crystal display device according to an embodiment of the present invention may further comprise a thin plate manufacturing step (S0).

In the thin plate manufacturing step S0, the liquid crystal cell 20 is reduced to a predetermined thickness prior to the attaching step S1.

In the thin plate manufacturing step S0, the surface of the upper substrate 21 and the surface of the lower substrate 23 are scraped so that the liquid crystal cell 20 has a predetermined thickness.

The thin plate manufacturing step S0 may include an import step S0-1 and an etching step S0-3.

In the import step S0-1, the liquid crystal cell 20 is loaded. In the etching step S0-3, the surface of the upper substrate 21 and the surface of the lower substrate 23 are scraped off so that the liquid crystal cell 20 is reduced to a predetermined thickness.

In the etching step S0-3, the entire surface of the upper substrate 21 and the entire surface of the lower substrate 23 may be scraped off, respectively. In the etching step S0-3, the surface of the upper substrate 21 and the surface of the lower substrate 23 may be scraped off except for the edge of the upper substrate 21 and the edge of the lower substrate 23.

The thin plate manufacturing step S0 may further include a removing step S0-2. In the removing step S0-2, when the polarizing film 30 is coupled to the liquid crystal cell 20 carried in the carrying step S0-1, the liquid crystal cell 20 carried through the carrying step S0-1. Remove the polarizing film 30 from.

Accordingly, the liquid crystal cell 20 carried in can be processed into an ultra-thin liquid crystal cell 20 having a predetermined thickness.

Bending method of the liquid crystal display device according to an embodiment of the present invention may further include a finishing step (S2).

The finishing step S2 surrounds the edge of the liquid crystal cell 20 to which the polarizing film 30 is coupled through the attaching step S1. The finishing part 40 may be formed at the edge of the liquid crystal cell 20 to which the polarizing film 30 is coupled while passing through the finishing step S2.

According to the above-described liquid crystal display device and the bending method of the liquid crystal display device, when the external force such as bending stress, vibration, impact, etc. is applied to the liquid crystal cell 20 which is configured as an ultra-thin or curved in a desired curved shape, the liquid crystal cell 20 is broken. Can be prevented.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. I will understand.

Accordingly, the true scope of protection of the present invention should be defined by the claims.

10: liquid crystal panel 20: liquid crystal cell
21: upper substrate 23: lower substrate
25: liquid crystal 30: polarizing film
31: first polarizing film 32: second polarizing film
40: finish portion 41: film extension portion
43: molding part 50: frame part
51: departure prevention part S0: sheet manufacturing step
S0-1: Import step S0-2: Remove step
S0-3: Etching Step S1: Attaching Step
S2: Finishing Step S3: Bending Step
S4: heating step S5: cooling step
S6: Separation step S7: Joining step

Claims (9)

An attaching step of forming a liquid crystal panel by injecting a liquid crystal between the upper substrate and the lower substrate and combining a polarizing film on both sides of the liquid crystal cell having a predetermined thickness;
Bending the liquid crystal panel that has undergone the attaching step into a curved shape;
A heating step of heating the surface of the liquid crystal panel to soften the polarizing film; And
A cooling step of cooling the polarizing film softened through the heating step; Bending method of the liquid crystal display device comprising a.
The method of claim 1,
When using the jig corresponding to the curved shape in the bending step,
A separation step of separating the jig from the liquid crystal panel through the cooling step; Bending method of the liquid crystal display device characterized in that it further comprises.
The method of claim 1,
Combining the frame parts on both sides of the liquid crystal panel after the cooling step; Bending method of the liquid crystal display device characterized in that it further comprises.
The method of claim 3,
In the frame portion,
A separation prevention part supporting an end of the liquid crystal panel; Bending method of the liquid crystal display device characterized in that the provided.
The method of claim 1,
The thickness of the polarizing film coupled to the liquid crystal cell through the attachment step, the bending method of the liquid crystal display device, characterized in that the same or larger than the thickness of the liquid crystal cell.
The method according to any one of claims 1 to 5,
A thin plate manufacturing step of reducing the liquid crystal cell to a predetermined thickness prior to the attaching step; Bending method of the liquid crystal display device characterized in that it further comprises.
The method according to claim 6,
The sheet manufacturing step,
An import step of bringing in the liquid crystal cell; And
An etching step of cutting the upper substrate and the lower substrate to reduce the liquid crystal cell to a predetermined thickness; Bending method of the liquid crystal display device comprising a.
8. The method of claim 7,
The sheet manufacturing step,
When the polarizing film is coupled to the liquid crystal cell passed through the import step,
A removing step of removing the polarizing film from the liquid crystal cell brought in through the loading step; Bending method of the liquid crystal display device characterized in that it further comprises.
The method according to any one of claims 1 to 5,
A finishing step of wrapping an edge of the liquid crystal panel through the attaching step; Bending method of the liquid crystal display device characterized in that it further comprises.

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