KR101275901B1 - Method of adjusting amount of liquid crystal in the liquid crystal display device - Google Patents

Abstract

A method of adjusting the amount of liquid crystal in a liquid crystal display device is disclosed. The method of controlling the amount of liquid crystal in the liquid crystal display device is that when too much liquid crystal is injected into the liquid crystal display device while the liquid crystal is primarily sealed in the liquid crystal display device, the width of the sealing member is firstly sealed in the sealing member to seal the liquid crystal. Place a mask having an opening to precisely reduce this. Subsequently, the laser beam is provided to the sealing member through the opening of the mask to sufficiently reduce the width of the sealing member, and then a pressure is applied to the liquid crystal to break the portion where the width is sufficiently reduced to remove the excessively injected liquid crystal from the liquid crystal display. Thereafter, the liquid crystals, which are excessively injected into the liquid crystal display panel, are easily removed from the liquid crystal display panel by secondarily sealing the broken parts of the sealing member with a sealing material such as a photocuring agent.

Liquid crystal, sealing, liquid crystal display, laser beam, mask

Description

How to adjust the liquid crystal amount in a liquid crystal display device {METHOD OF ADJUSTING AMOUNT OF LIQUID CRYSTAL IN THE LIQUID CRYSTAL DISPLAY DEVICE}

1 is a flowchart illustrating a method for adjusting the amount of liquid crystal in a liquid crystal display according to an embodiment of the present invention.

2 is a cross-sectional view illustrating a liquid crystal display device in which the liquid crystal amount is adjusted by the method of FIG. 1.

3 is a cross-sectional view illustrating an arrangement of the metal member and the sealing member shown in FIG. 2.

4 is a perspective view illustrating a mask for precisely removing a portion of the sealing member illustrated in FIG. 3 to form a residual seal on a portion of the sealing member.

5 is a plan view illustrating a relationship between the sealing member and the mask of FIG. 4.

6 is a cross-sectional view of the mask portion of FIG. 4;

7 is a plan view illustrating a residual seal formed by the process of FIG. 6.

8 is a cross-sectional view illustrating resealing of a broken residual seal.

<Explanation of symbols for the main parts of the drawings>

10: liquid crystal layer 20: first substrate

30: second substrate 40: sealing member

45a: residual seal 80: mask

81: opening

The present invention relates to a liquid crystal amount adjusting method in a liquid crystal display device. More specifically, the present invention is to precisely remove the sealing member for sealing the liquid crystal in order to discharge a portion of the liquid crystal excessively injected into the liquid crystal display without bubble inflow to the outside so that the amount of liquid crystal in the liquid crystal display device can be easily adjusted. A liquid crystal amount adjusting method in a liquid crystal display device.

In recent years, technology development of an information processing apparatus capable of processing a large amount of data in a short time is being made rapidly, and along with the development of a technology of a display apparatus capable of confirming image data processed by the information processing apparatus with images. .

As a typical display device, there may be mentioned a liquid crystal display device. The liquid crystal display displays an image using liquid crystal. The liquid crystal has an electrical property in which the arrangement is changed in response to the direction of the electric field and an optical characteristic in which the light transmittance is changed in accordance with the arrangement.

A liquid crystal display device for displaying an image using a liquid crystal includes a liquid crystal control part for driving an liquid crystal to display an image and a light supply part for providing light necessary for displaying an image on the liquid crystal control part.

Among these, the liquid crystal control part includes a pair of substrates facing each other and a liquid crystal layer injected between the substrates to generate an electric field for driving the liquid crystal. In general, the liquid crystal layer interposed between the substrates has a thickness of several micrometers.

In order to inject a liquid crystal layer of only a few micrometers between the substrates, a vacuum injection method or a dropping method is used.

Vacuum injection method injects the liquid crystal to the substrate by the vacuum pressure formed between the substrates, dropping method is to drop the liquid crystal on any one of the substrate and then to assemble a pair of substrates to place the liquid crystal between the substrates .

However, when the liquid crystal is injected into the substrate by the vacuum injection method or the dropping method, when a small amount of liquid crystal is injected between the substrates, an empty space in which no liquid crystal is filled is formed between the substrates. A defect that does not appear is generated. On the contrary, when too much liquid crystal is injected between the substrates, the liquid crystal moves in the direction of gravity when the liquid crystal display device is displayed to display an image, and thus the image is not realized in the lower portion of the liquid crystal display device.

The present invention provides a method of controlling the amount of liquid crystal in a liquid crystal display by precisely removing the sealing member for sealing the liquid crystal in order to efficiently remove the liquid crystal excessively injected into the liquid crystal display without bubble inflow.

The liquid crystal amount adjusting method in the liquid crystal display device for implementing the object of the present invention as described above is accommodated between the first substrate, the second substrate facing the first substrate and the sealing member interposed between the first and second substrates. Storing liquid crystal in the space, placing a mask having an opening corresponding to the overlapping portion of the metal member overlapped with a part of the sealing member on the first substrate, and scanning the laser beam to the overlapping portion through the opening of the mask. A process of forming a residual seal by reducing the width of a portion of the sealing member relative to the rest of the sealing member, and a process of opening and discharging a portion of the liquid crystal contained in the storage space by applying pressure to the liquid crystal to reduce the width of the sealing member. Resealing the remaining residual seal.

Hereinafter, the liquid crystal amount adjusting method in the liquid crystal display according to the exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments. Those skilled in the art will be able to implement the invention in various other forms without departing from the spirit of the invention. In the accompanying drawings, the dimensions of the first substrate, the second substrate, the sealing member, the mask having the opening, the liquid crystal and the residual sealing portion, and other structures are shown in an enlarged scale than actual for clarity of the present invention. In the present invention, when the first substrate, the second substrate, the sealing member, the mask having the opening, the liquid crystal and the residual seal, and other structures are referred to as being formed "on", "upper" or "lower" The first substrate, the second substrate, the sealing member, the mask having the opening, the liquid crystal and the residual sealing and other structures directly include the first substrate, the second substrate, the sealing member, the mask having the opening, the liquid crystal and the remaining sealing and the like. It is meant to be formed above or below the structures, or other first substrates, second substrates, sealing members, masks with openings, liquid crystals and residual seals and other structures may be further formed on the substrate. Also, where the first substrate, second substrate, and other structures are referred to as, for example, "first", "second", etc., this is not intended to limit these members, but only the first substrate and the second substrate. And other structures. Thus, for example, substrates such as “first”, “second” can be used selectively or interchangeably with respect to the first and second substrates and other structures, respectively.

1 is a flowchart illustrating a method for adjusting the amount of liquid crystal in a liquid crystal display according to an embodiment of the present invention. 2 is a cross-sectional view illustrating a liquid crystal display device in which the liquid crystal amount is adjusted by the method of FIG. 1.

1 and 2, in step S10, the liquid crystal layer 10 is injected into the liquid crystal display device 100. In the present embodiment, the liquid crystal layer 10 may be disposed in the liquid crystal display device 100 by a vacuum method or a dropping method.

Hereinafter, the liquid crystal display device 100 will be described in more detail with reference to FIG. 2.

The liquid crystal display device 100 includes a first substrate 20, a second substrate 30, a liquid crystal layer 10, a sealing member 40, and a metal member 50.

The first substrate 20 includes a first transparent substrate 21 such as a glass substrate, thin film transistors 22, and a pixel electrode 24.

The thin film transistors 22 are disposed on the first transparent substrate 21. In the present exemplary embodiment, a plurality of thin film transistors 22 are disposed on the first transparent substrate 21 corresponding to the resolution of the liquid crystal display device 100. For example, when the resolution of the liquid crystal display device 100 is 1024 × 768, 1024 × 768 × 3 thin film transistors 22 are formed on the first transparent substrate 21 in a matrix form.

Each of the thin film transistors 22 may include a gate electrode G connected to a gate signal line, a gate insulating layer GI for insulating the gate electrode G, and a gate electrode G among the gate insulating layers GI. A channel layer C and a source electrode S and a drain electrode G disposed on the channel layer C are formed. The channel layer C may include an amorphous silicon pattern (not shown) and an n + amorphous silicon pattern (not shown) having a conductive property by being ion-doped with high concentration by impurities. In addition, the source electrode S is connected to a data line (not shown) orthogonal to the gate signal line, and the source electrode S and the drain electrode D are spaced apart from each other on the channel layer.

The pixel electrode 24 is electrically connected to the drain electrode D of the thin film transistor 22. In this embodiment, the pixel electrode 24 includes a transparent conductive material. Examples of materials that can be used as the pixel electrode 24 include indium tin oxide (ITO), indium zinc oxide (IZO), amorphous indium tin oxide (a-ITO), and the like. Can be mentioned.

The second substrate 30 may include a second transparent substrate 31 such as a glass substrate, a black matrix 32, and a color filter 34.

In this embodiment, the black matrix 32 is disposed on the second transparent substrate 31. In this embodiment, examples of the material that can be used as the black matrix 32 include chromium or chromium oxide having high light absorption.

In a plan view, the black matrix 32 is disposed between the pixel electrodes PE of the first substrate 20. Since the pixel electrodes PE of the first substrate 20 are arranged in a matrix form, the black matrices 32 may be arranged in a grid form. The black matrices 32 not only cover the thin film transistors 22 disposed on the first substrate 20, but also absorb external light to improve the sharpness of the image.

The color filter 34 is disposed for each opening of the black matrix 32. In this embodiment, the color filter 34 disposed at each opening of the black matrix 32 is a red color filter R for passing red light having a red wavelength from white light, and green light having a green wavelength from white light. A green color filter G and a blue color filter B for passing blue light having a blue wavelength from white light are included.

The sealing member 40 is disposed between the first substrate 20 and the second substrate 30 disposed to face each other. For example, the sealing member 40 is disposed at an edge of the first substrate 20 and the second substrate 30 to accommodate a liquid crystal between the first substrate 20 and the second substrate 30. To provide. In the present embodiment, the sealing member 40 may include a photocurable material that is cured by light, for example, ultraviolet rays.

The liquid crystal layer 10 is disposed in the space formed by the sealing member 40. In the present embodiment, the liquid crystal contained in the liquid crystal layer 10 may include any kind of liquid crystal, such as a twisted nematic liquid crystal and a vertically aligned liquid crystal.

3 is a cross-sectional view illustrating an arrangement of the metal member and the sealing member shown in FIG. 2.

Referring to FIG. 3, the metal member 50 is disposed on the first substrate 20, for example. Specifically, the metal member 50 is interposed between the sealing member 40 and the first substrate 20. More specifically, the metal member 50 has a piece shape, and has a shape overlapping a portion with the sealing member 40.

The metal member 50 is disposed on the outer wall 42 facing the inner wall 44 that contacts the liquid crystal layer 10 of the sealing member 40, and when the total thickness of the sealing member 40 is T, the metal The member 50 and the sealing member 40 overlap about 85% to 95%.

Therefore, the thickness t which does not overlap with the metal member 50 in the sealing member 40 is about 5% to 15% of the total thickness T of the sealing member 40. In the present embodiment, a portion overlapping the sealing member 40 of the metal member 50 is defined as the overlapping portion 56, and a portion not overlapping the sealing member 40 is defined as the exposed portion 55. Shall be.

In this embodiment, examples of the material that can be used as the metal member 50 include a gate electrode of the thin film transistor, a source / drain electrode of the thin film transistor, and a material forming the pixel electrode. That is, the metal member may be aluminum, aluminum alloy, ITO, IZO, a-ITO and the like.

Referring to FIGS. 1 and 2 again, if the liquid crystal layer 10 is disposed on the liquid crystal display device 100 and the liquid crystal layer 10 is excessively injected into the liquid crystal display device 100, the liquid crystal display A process of removing the liquid crystal layer 10 by the amount excessively injected from the inside of the device 100 is performed.

In the present exemplary embodiment, the width of a part of the sealing member 40 is reduced in order to discharge a predetermined amount of liquid crystal excessively injected into the liquid crystal display device 100, and the sealing member 40 is applied by applying pressure to the liquid crystal layer 10. A portion of the liquid crystal that is excessively injected into the liquid crystal display 100 is discharged by breaking the weakened portion due to its reduced width.

At this time, in this embodiment, in order to reduce the width of the sealing member 40, a high energy laser beam is scanned in the sealing member 40.

In the present invention, in order to break the sealing member 40 by the pressure applied to the liquid crystal layer 10, the width of the sealing member 40 is reduced by about 85% to about 95%. In order to remove a part of the sealing member 40, light excellent in linearity, such as a laser beam, can be used.

However, the laser beam is scanned on an unwanted portion of the sealing member 40 by vibration / shock or the like applied to the liquid crystal display device 100 or the laser beam generating device (not shown) that generates the laser beam, thereby sealing member 40. May open unexpectedly.

When a part of the sealing member 40 is unexpectedly opened, the liquid crystal flows out from the inside of the liquid crystal display device 100 to the outside of the liquid crystal display device through the open portion, and the liquid crystal display device 100 while the liquid crystal flows out. Air may flow into the air bubbles inside the liquid crystal display device 100.

4 is a perspective view illustrating a mask for precisely removing a portion of the sealing member illustrated in FIG. 3 to form a residual seal on the sealing member. FIG. 5 is a plan view illustrating a relationship between a sealing member and a mask of FIG. 4. 6 is a cross-sectional view of the mask part of FIG. 4; 7 is a plan view illustrating a residual seal formed by the process of FIG. 6.

4 to 6, the mask 80 may include a first surface 82 and a second surface 84, and may be made of a material that is not damaged by a laser beam.

In the present embodiment, the first surface 82 has a plate shape disposed along the upper surface of the second substrate 30 of the liquid crystal display device 100, for example, and the second surface 84 has a first surface. It has a plate shape disposed along the side surface connected to the upper surface of the second substrate 30 from the end of the surface 82. In this embodiment, the second face 84 is bent from the first face 81 to have an "L" shape. The second surface 84 allows the opening 81 to be described later and the overlap 56 of the metal member 50 under the sealing member 40 to be more easily aligned.

The opening 81 is formed in the 1st surface 82 in the planar view of the 2nd board | substrate 30. FIG. In the present embodiment, the opening 81 may have a rectangular shape. In particular, the opening 81 has a size suitable to overlap at least the overlap 56 of the metal member 50 of the first face 82. In the present embodiment, the outer wall 42 facing the inner wall 44 of the sealing member 40 which contacts the liquid crystal layer 10 of the sealing member 40 by the opening 81 is exposed. Reference numeral 45 denotes a repair portion which is a recess formed by the residual sealing portion 45a.

Referring to FIG. 6, in order to form the residual seal 45a, the laser beam 65 generated from the laser beam generator 60 is formed with an opening 81 formed in the first surface 82 of the mask 80. Is injected towards.

Subsequently, the laser beam 65 sequentially penetrates through the opening 81, the second substrate 30, and the sealing member 40 formed in the first surface 82 of the mask 80 to form the metal member 50. It is scanned in the overlap 56.

In the mask 80 having the opening 81, the vibration and / or the laser beam 65 generated by the laser beam generator 60 is applied to the laser beam generator 60 and / or the liquid crystal display 100. When the scanning position of the laser beam 65 is slightly changed by the impact, the laser beam 65 deviating from the designated position may be blocked to prevent the laser beam 65 from being scanned at an unwanted portion of the sealing member 40. have.

In the present embodiment, the second substrate 30 and the sealing member 40 hardly absorb the energy of the laser beam 65 passing through the opening 81 of the mask 80 while the metal member 50 is the laser. Most of the beams 65 are absorbed, which causes the metal member 50 to heat up rapidly.

In order to efficiently form the residual seal 45 in the sealing member 40, the laser beam 65 preferably has a wavelength length of about 800 nm to about 1,200 nm. In this embodiment, when the wavelength of the laser beam 65 is 1,200 nm or more, not only the sealing member 40 but also the second substrate 30 and the first substrate 20 may be severely damaged by the laser beam 65. When the wavelength of the laser beam 65 is 800 nm or less, the energy level of the laser beam 65 is too low, making it difficult to burn off the metal member 50.

Thus, when the laser beam having a wavelength range of about 800 nm to about 1,200 nm is scanned into the overlapping portion 56 of the metal member 50 through the opening 81 of the mask 80, the metal member 50 is a laser beam. It absorbs the energy of 65 and is easily oxidized.

At this time, in the present embodiment, the sealing member 40 corresponding to the overlapping portion 56 of the metal member 50 is also removed together with the oxidation of the metal member 50, and as illustrated in FIG. 7, the repair portion 45 is removed. ) And a residual seal 45a are formed. In the present embodiment, at least two residual sealing parts 45a may be formed in the sealing member 40.

In the present embodiment, the recess 45 is defined as a portion corresponding to the overlap 56 of the metal member 50, and the overlap 56 of the metal member 50 is about 85 with the sealing member 40. Since% to about 95% overlap, about 5% to 15% of the width of the sealing member 40 remains in the sealing member 40 corresponding to the repair portion 45, and the repairing member 40 is repaired. The part left in the part 45 becomes the residual sealing part 45a.

As described above, the remaining sealing portion 45a is formed in the sealing member 40 as the portion of the sealing member 40 corresponding to the overlapping portion 56 of the metal member 50 is removed by the laser beam 65. The residual seal 45a is formed smoothly regardless of the unexpected change of the position of the laser beam by the opening 81 of the mask 80.

Referring back to FIG. 1, in step S30, after the remaining sealing part 45a is formed in the sealing member 40, the liquid crystal layer excessively injected into the liquid crystal display device 100 using the remaining sealing part 45a. The liquid crystal amount of (10) is adjusted.

In order to adjust the amount of liquid crystal excessively injected into the liquid crystal display 100, pressure is applied from the outside of the liquid crystal display 100, and the pressure applied to the liquid crystal display 100 is transferred to the liquid crystal layer 10 again. do. The pressure transmitted to the liquid crystal layer 10 is again transmitted to the sealing member 40.

At this time, when the pressure transmitted to the liquid crystal layer 10 is sufficient to break the residual seal 45a, the residual seal 45a is broken by the pressure transmitted to the liquid crystal layer 10.

Subsequently, a part of the liquid crystal excessively injected into the liquid crystal display device 100 through the broken residual seal part 45a is discharged through the broken residual seal part 45a, so that the amount of liquid crystal in the liquid crystal display device 100 is adjusted.

8 is a cross-sectional view illustrating resealing of a broken residual seal.

Referring to FIG. 8, although the liquid crystal contained in the liquid crystal layer 10 flows out into the broken residual sealing part 45a, the inside of the liquid crystal layer 10 through the remaining sealing part 45a broken out of the outside air again. Can also flow into.

In order to prevent this, in step S40 of FIG. 1, the photocuring agent 70 is disposed at the portion of the broken residual seal 45a and the light is injected into the photocuring agent 70 to seal the broken residual seal 45a again. In the present embodiment, the photocuring agent 70 preferably uses an ultraviolet curing agent that is cured by ultraviolet rays.

As described above in detail, when too much liquid crystal is injected into the liquid crystal display in a state where the liquid crystal is primarily sealed in the liquid crystal display, the width of the sealing member is precisely adjusted to the sealing member first to seal the liquid crystal. Place a mask with openings to reduce.

Subsequently, the laser beam is provided to the sealing member through the opening of the mask to sufficiently reduce the width of the sealing member, and then pressure is applied to the liquid crystal to break up the portion where the width is sufficiently reduced so that the excessively injected liquid crystal is removed from the liquid crystal display device. After the removal, the sealing part of the sealing member is secondarily sealed with a sealing material such as a photocuring agent, so that the liquid crystal excessively injected into the liquid crystal display panel can be easily removed from the liquid crystal display panel.

Although the detailed description of the present invention has been described with reference to the embodiments of the present invention, those skilled in the art or those skilled in the art will have the spirit and scope of the present invention as set forth in the claims below. It will be appreciated that various modifications and variations can be made in the present invention without departing from the scope of the art.

Claims (5)

Storing liquid crystal in a storage space formed between a first substrate, a second substrate facing the first substrate, and a sealing member interposed between the first and second substrates; Disposing a mask on the first substrate, the mask having an opening corresponding to an overlapping portion of the metal member overlapping a portion of the sealing member; Scanning a laser beam into the overlapping portion through the opening of the mask to reduce the width of a portion of the sealing member relative to the remaining portion of the sealing member to form a residual seal; Applying a pressure to the liquid crystal to discharge a portion of the liquid crystal contained in the accommodation space through the residual sealing portion; And And resealing the open residual seal. 2. The mask of claim 1, wherein the mask is formed by contacting the first substrate with a first surface having the opening and a second curved surface extending along a side surface from the first surface to an upper surface of the first substrate. A liquid crystal amount adjusting method of a liquid crystal display device, which is fixed to a substrate. The method of claim 1, wherein a width of the sealing member is exposed by 85% to 95% by the laser beam by the opening. The liquid crystal display according to claim 1, wherein an outer wall of the sealing member facing an inner wall in contact with the liquid crystal is exposed to the laser beam by the opening. The method of claim 1, wherein the laser beam has a wavelength of 800 nm to 1,200 nm.

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