KR101330367B1 - liquid crystal display device and method of fabricating the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device (LCD), and more particularly, to a liquid crystal display device having a plurality of liquid crystal panels and having a light weight and thin shape, and a method of manufacturing the same.

A liquid crystal display device according to the present invention includes a first liquid crystal panel including first and second substrates and a first liquid crystal layer interposed between the first substrate and the second substrate; And a second liquid crystal panel disposed in parallel with a second substrate surface of the first liquid crystal panel, wherein an accommodating part is formed on an upper surface of the second substrate, and the second liquid crystal panel is inserted into the accommodating part. It features.

The present invention can manufacture a lightweight, thin liquid crystal display device.

The present invention can reduce manufacturing costs by using a polarizing plate in common between a first liquid crystal panel providing a main image and a second liquid crystal panel for controlling the viewing angle.

According to the present invention, the second liquid crystal panel is inserted into the recess groove of the first liquid crystal panel so that the manufacturing is simple and the assembly is simple.

Narrow Viewing Angle, Wide Viewing Angle, Groove, Recess

Description

Liquid crystal display device and method of manufacturing the same {liquid crystal display device and method of fabricating the same}

1 is a cross-sectional view showing a bonding state of first and second liquid crystal panels in a liquid crystal display device having a viewing angle control as a first embodiment according to the present invention.

FIG. 2 is a cross-sectional view of a liquid crystal display showing a state in which the first and second liquid crystal panels are bonded to each other in FIG. 1.

3 is a cross-sectional view of a liquid crystal display as a second embodiment according to the present invention;

4 is a cross-sectional view of a liquid crystal display as a third embodiment according to the present invention;

5 is a cross-sectional view of a liquid crystal display as a fourth embodiment according to the present invention;

6 is a cross-sectional view showing a part of a liquid crystal display as a fifth embodiment according to the present invention;

Description of the Related Art [0002]

100, 200, 300, 400: liquid crystal display device

101, 201, 301, 401: first substrate

102, 202, 302, 402: second substrate

103, 203, 303, 403: third substrate

104, 204, 304, 404: fourth substrate

110, 210, 310, 410: first liquid crystal panel

111, 211, 311, and 411: first polarizing plate

112, 212, 312 412: second polarizing plate

113, 213, 313 413: third polarizer

114, 314: fourth polarizer

115, 215, 315, 415: groove

120, 220, 320, 420: second liquid crystal panel

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device (LCD), and more particularly, to a liquid crystal display device having a plurality of liquid crystal panels and having a light weight and thin shape, and a method of manufacturing the same.

Description of the Related Art [0002] Recently, a liquid crystal display device, which is one of the continuously attracting attention of flat panel display devices, is an apparatus for changing an optical anisotropy by applying an electric field to a liquid crystal having fluidity of liquid and crystal optical properties. The power consumption is low, the volume is small, and it is widely used because of its large size and fixed tax.

The LCD has a variety of modes depending on the nature of the liquid crystal and the structure of the pattern.

Specifically, the TN mode (Twisted Nematic Mode) for arranging the liquid crystal directors to be twisted by 90 ° and controlling the liquid crystal directors by applying a voltage, and polarizing the liquid crystal molecules by applying voltage to the cells aligned in the vertical direction. OCB mode (Optically Compensated Birefringence Mode), which modulates and optically compensates with a vertically symmetrical structure, and a transverse electric field system in which the director of the liquid crystal changes with the electric field in parallel planes of the alignment layer by forming two electrodes on one substrate. In-Plane Switching Mode, and VA mode (Vertical Alignment) in which the long axis of the liquid crystal molecules are vertically aligned with the plane of the alignment layer using a negative liquid crystal and a vertical alignment layer.

A black matrix for preventing light leakage and a color filter layer of R, G, and B for implementing color on the black matrix are formed on the upper substrate of the liquid crystal display of various modes, and the lower substrate is opposed to the upper substrate. A plurality of gate wirings and data wirings defining unit pixels, a plurality of thin film transistors formed at intersections of the gate wirings and data wirings, and pixel electrodes for driving liquid crystals are basically formed in the substrate. The common electrode forming an electric field with the pixel electrode may be formed on an upper substrate or a lower substrate. A liquid crystal layer is formed between the upper substrate and the lower substrate.

The liquid crystal display device artificially adjusts the orientation direction of liquid crystal molecules having directionality using polarization, and applies a voltage to the common electrode and the pixel electrode to generate liquid crystal molecules of the liquid crystal layer by an electric field generated therebetween. It rotates in a specific direction, and the screen can be displayed by blocking and transmitting light by the birefringence characteristic of the liquid crystal.

However, the liquid crystal display of the prior art has a problem in that when a computer is used for personal reasons or a computer that requires security, a computer screen may be seen not only by the user but also by a third party, thereby invading privacy or security.

An object of the present invention is to provide a liquid crystal display device and a method of manufacturing the same, which can selectively drive a narrow viewing angle mode and a wide viewing angle mode.

According to an aspect of the present invention, a liquid crystal display device includes: a first liquid crystal panel including first and second substrates and a first liquid crystal layer interposed between the first and second substrates; And a second liquid crystal panel disposed in parallel with a second substrate surface of the first liquid crystal panel, wherein an accommodating part is formed on an upper surface of the second substrate, and the second liquid crystal panel is inserted into the accommodating part. It features.

In addition, in order to achieve the above object, a method of manufacturing a liquid crystal display device according to the present invention comprises the steps of preparing a first liquid crystal panel and a second liquid crystal panel; And forming an accommodating part for inserting the second liquid crystal panel on one surface of the substrate of the first liquid crystal panel.

According to the present invention, when the first liquid crystal panel and the second liquid crystal panel are stacked in the emission direction of the backlight light in the liquid crystal display device, a light-weight and thin liquid crystal display device may be manufactured by forming an accommodating part on the surface of one panel and inserting another panel. Can be.

The present invention can be selectively driven in a narrow viewing angle mode and a wide viewing angle mode.

The present invention can reduce the manufacturing cost by using one polarizing plate between the first liquid crystal panel for providing the main image and the second liquid crystal panel for controlling the viewing angle.

According to the present invention, the second liquid crystal panel is inserted into the recess groove of the first liquid crystal panel to insert the second liquid crystal panel, thereby eliminating the need for a separate fixing means, and thus the manufacturing is simple and the assembly is simple.

Hereinafter, a liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view illustrating a bonding state of first and second liquid crystal panels in a liquid crystal display device capable of selectively controlling a narrow viewing angle mode and a wide viewing angle mode as a first embodiment according to the present invention. FIG. 2 is a cross-sectional view of a liquid crystal display showing a state in which the first and second liquid crystal panels are bonded to each other in FIG. 1.

1 and 2, the liquid crystal display device 100 according to the present invention is inserted into the first liquid crystal panel 110 and the groove 115 of the upper surface of the first liquid crystal panel 110. If necessary, a second liquid crystal panel 120 is configured to control the viewing angle in the narrow viewing angle mode and the wide viewing angle mode.

The first liquid crystal panel 110 is a main liquid crystal panel in which an image desired by a user is implemented, and the second liquid crystal panel 120 controls to view an image from the first liquid crystal panel 110 at a desired viewing angle. Panel for viewing angle control.

The first liquid crystal panel 110 and the second liquid crystal panel 120 are stacked in the emission direction of the backlight light disposed on the rear surface of the first liquid crystal panel 110.

The first liquid crystal panel 110 is bonded to the first substrate 101 and the second substrate 102 so as to face each other and spaced apart from each other, and although not shown, the first substrate 101 and the second substrate are not shown. The first liquid crystal layer is formed between the 102.

The second substrate 102 has a groove 115 formed at a predetermined depth k so that the second liquid crystal panel 120 can be inserted therein.

Preferably, the depth k of the groove 115 is thicker than the thickness of the polarizing plate.

For example, the groove may be formed by etching the second substrate, and when the second substrate is glass, wet etching may be performed using hydrofluoric acid (HF).

The groove 115 may be a recess formed on the second substrate 102, and may be referred to as an accommodation part into which the second liquid crystal panel 120 is inserted.

Although not illustrated, a thin film transistor (TFT) and a pixel electrode may be formed on an inner surface of the first substrate 101, and a color filter and a common electrode may be formed on an inner surface of the second substrate 102.

The second liquid crystal panel 120 formed on the outer surface of the second substrate 102 is bonded to the third substrate 103 and the fourth substrate 104 to be spaced apart from each other and spaced apart at regular intervals. The second liquid crystal layer is formed between the third substrate 103 and the fourth substrate 104.

Although not shown, first and second electrodes are formed on inner surfaces of the third and fourth substrates 103 and 104, respectively, and the first and second electrodes are predetermined control units for applying an electric field to the second liquid crystal layer. Connected with.

The second liquid crystal layer is aligned horizontally or vertically by an applied electric field.

A first polarizing plate 111 is formed on an outer surface of the first substrate 101 of the first liquid crystal panel 110, and a first polarizing plate 111 is formed on an outer surface of the second substrate 102 of the first liquid crystal panel 110. 2 polarizing plates 112 are formed.

A third polarizing plate 113 is formed on an outer side surface of the third substrate 103 of the second liquid crystal panel 120, and a fourth polarizing plate 114 is formed on an outer side surface of the fourth substrate 104. have.

When driving the wide viewing angle mode, the second liquid crystal panel 120 passes an image generated from the first liquid crystal panel 110 as a predetermined electric field is applied or not.

In the narrow viewing angle mode driving, the second liquid crystal panel 120 passes light processed from the second liquid crystal panel 120 only in a predetermined direction by applying or not applying a predetermined electric field.

Preferably, the groove 115 formed in the second substrate 102 is excavated in the shape of the third substrate 103 so that the third substrate 103 can be inserted therein.

The thickness of the first liquid crystal panel 110 and the first and second polarizing plates 111 and 112 is a, and the thicknesses of the second liquid crystal panel 120 and the third and fourth polarizing plates 113 and 114 are When the thickness is b, the thickness c of the liquid crystal display device 100 in which the first liquid crystal panel 110 and the second liquid crystal panel 120 are bonded is smaller than (a + b).

That is, the overall thickness of the liquid crystal display for controlling the viewing angle that can be selectively driven in the narrow viewing angle mode and the wide viewing angle mode according to the present invention becomes thinner and lighter in weight.

Accordingly, the liquid crystal display device according to the present invention is useful when applied to products requiring light weight and thinness, such as mobile liquid crystal display devices and notebook liquid crystal display devices.

When the predetermined region is etched in the second substrate 102 of the first liquid crystal panel 110 to form the groove 115, and the second liquid crystal panel 120 is inserted into the groove 115, the first Since a separate structure for fixing the liquid crystal panel 110 and the second liquid crystal panel 120 is not required, the weight of the product may be further reduced, and manufacturing cost may be reduced.

3 is a cross-sectional view of a liquid crystal display as a second embodiment according to the present invention.

As shown in FIG. 3, the liquid crystal display device 200 according to the present invention is inserted into the first liquid crystal panel 210 and the groove 215 of the upper surface of the first liquid crystal panel 210 as necessary. A second liquid crystal panel 220 for viewing angle control and a first polarizing plate 211 formed on an outer surface of the first substrate 201 of the first liquid crystal panel 210 to be driven in a narrow viewing angle mode and a wide viewing angle mode. ), A second polarizing plate 212 formed on an outer surface of the second substrate 202 of the first liquid crystal panel 210, and a third polarizing plate 213 formed on an outer surface of the fourth substrate 204. It is made, including.

The first liquid crystal panel 210 and the second liquid crystal panel 220 are stacked in the emission direction of the backlight light disposed on the rear surface of the first liquid crystal panel 210.

Here, the second polarizing plate 212 serves as an upper polarizing plate of the first liquid crystal panel 210, and the second polarizing plate 212 serves as a lower polarizing plate of the second liquid crystal panel 220.

The first liquid crystal panel 210 is a main liquid crystal panel in which an image desired by a user is realized, and the second liquid crystal panel 220 controls to view an image from the first liquid crystal panel 210 at a desired viewing angle. Panel for viewing angle control.

The first liquid crystal panel 210 is bonded to the first substrate 201 and the second substrate 202 facing each other and spaced apart from each other, and although not shown, the first substrate 201 and the second substrate are not shown. The first liquid crystal layer is formed between the 202.

The second substrate 202 has a groove 215 formed at a predetermined depth k so that the second liquid crystal panel 210 can be inserted therein.

Preferably, the depth k of the groove 215 is thicker than the thickness of the polarizing plate.

Although not illustrated, a thin film transistor (TFT) and a pixel electrode may be formed on an inner surface of the first substrate 201, and a color filter and a common electrode may be formed on an inner surface of the second substrate 202.

The second liquid crystal panel 210 formed on the outer surface of the second substrate 202 is bonded to the third substrate 203 and the fourth substrate 204 to be spaced apart from each other by a predetermined interval, and is not shown. A second liquid crystal layer is formed between the third substrate 203 and the fourth substrate 204.

Although not shown, first and second electrodes are formed on inner surfaces of the third and fourth substrates 203 and 204, respectively, and the first and second electrodes are predetermined control units for applying an electric field to the second liquid crystal layer. Connected with.

The second liquid crystal layer is aligned horizontally or vertically by an applied electric field.

When the wide viewing angle mode is driven, a predetermined electric field is not applied to the second liquid crystal panel 220.

When driving the wide viewing angle mode, the light incident from the backlight disposed on the rear surface of the first liquid crystal panel 210 passes through the first polarizing plate 211, and the light passing through the first polarizing plate 211 passes through the first polarizing plate 211. Light passing through the first liquid crystal layer and the second polarizing plate 212 and passing through the second polarizing plate 212 passes through the second liquid crystal panel 220 as it is and passes through the third polarizing plate 213. The image can be seen from all fields of view.

When driving the narrow viewing angle mode, the second liquid crystal panel 220 is applied with a predetermined electric field to pass the processed light from the second liquid crystal panel 220 only in a predetermined direction.

When driving the narrow viewing angle mode, the light incident from the backlight disposed on the rear surface of the first liquid crystal panel 210 passes through the first polarizing plate 211, and the light passing through the first polarizing plate 211 passes through the first polarizing plate 211. Light passing through the first liquid crystal layer and the second polarizing plate 212, and passing through the second polarizing plate 212, passes through the second liquid crystal panel 220 and the third polarizing plate 213, and then emits light only in a predetermined direction. This transmission allows the desired image to be seen only in a narrow field of view at a certain angle.

Preferably, the groove 215 formed in the second substrate 202 is dug into the shape of the third substrate 203 so that the third substrate 203 can be inserted therein.

The thickness of the first liquid crystal panel 210 and the first and second polarizing plates 211 and 212 may be a, and the thickness of the second liquid crystal panel 220 and the third polarizing plate 213 may be b. When the first liquid crystal panel 210 and the second liquid crystal panel 220 are bonded together, the thickness c ′ of the liquid crystal display device 200 is smaller than (a + b).

Here, the first liquid crystal panel 210 and the second liquid crystal panel 220 share the second polarizing plate 212, thereby making the thickness of the liquid crystal display 200 thinner and lighter.

When the predetermined region is etched in the second substrate 202 of the first liquid crystal panel 210 to form the groove portion 215, and the second liquid crystal panel 220 is inserted into the groove portion 215, the first liquid crystal panel 220 is inserted into the groove portion 215. Since a separate structure for fixing the liquid crystal panel 210 and the second liquid crystal panel 220 is not required, the weight of the product may be further reduced, and manufacturing cost may be reduced.

Accordingly, the liquid crystal display device according to the present invention is useful when applied to products requiring light weight and thinness, such as mobile liquid crystal display devices and notebook liquid crystal display devices.

4 is a cross-sectional view illustrating a part of a liquid crystal display as a third embodiment according to the present invention.

Here, detailed descriptions and reference numerals will be omitted for the same parts as those shown in FIG. 2.

The liquid crystal display device 300 according to the present invention includes a first liquid crystal panel 310 for providing a main image and a groove portion 315 for inserting the first liquid crystal panel 310 to view the image. A second liquid crystal panel 320 for controlling the viewing angle is included.

The first liquid crystal panel 310 is a liquid crystal panel that provides a main image. Since the thin film transistor, the electrode, and the wiring structures are complex, the groove portion 315 is formed in the second liquid crystal panel 320. The first liquid crystal panel 310 is inserted into the groove 315 to be fixed.

As a result, defects that may occur when the groove is formed in the first liquid crystal panel 310 may be prevented and the stability of the process may be improved.

In addition, since the liquid crystal display device 300 according to the present invention inserts the first liquid crystal panel 310 into the second liquid crystal panel 320 so as to be inserted therein, no additional fixing means is required, and thus the manufacturing is simple and the assembly is simple.

5 is a cross-sectional view illustrating a part of a liquid crystal display as a fourth embodiment according to the present invention.

Here, detailed descriptions and reference numerals will be omitted for the same parts as those shown in FIG. 4.

The liquid crystal display device 400 according to the present invention includes a first liquid crystal panel 410 for providing a main image, and a groove portion 415 for inserting the first liquid crystal panel 410, which can view the image. A second liquid crystal panel 420 for controlling a viewing angle, a first polarizing plate 411 formed on an outer surface of the first substrate 401 of the first liquid crystal panel 410, and the first liquid crystal panel 410 And a second polarizing plate 412 formed on the outer side of the second substrate 402 and a third polarizing plate 413 formed on the outer side of the fourth substrate 404.

The first liquid crystal panel 410 is a liquid crystal panel that provides a main image. Since the thin film transistor, the electrode, and the wiring structures are complex, the groove portion 415 is formed in the second liquid crystal panel 420. The first liquid crystal panel 410 is inserted into the groove 415 to be fixed.

As a result, defects that may occur when the groove 415 is formed in the first liquid crystal panel 410 may be prevented and the stability of the process may be improved.

Meanwhile, a predetermined electric field is not applied to the second liquid crystal panel 420 when driving the wide viewing angle mode.

When driving the wide viewing angle mode, the light incident from the backlight disposed on the rear surface of the first liquid crystal panel 410 passes through the first polarizing plate 411, and the light passing through the first polarizing plate 411 passes through the first polarizing plate. The light passing through the first liquid crystal layer and the second polarizing plate 412 and passing through the second polarizing plate 412 passes through the second liquid crystal panel 420 as it is and passes through the third polarizing plate 413. The image can be seen from all fields of view.

When driving the narrow viewing angle mode, the second liquid crystal panel 420 is applied with a predetermined electric field to pass the light processed from the second liquid crystal panel 420 only in a predetermined direction.

In the narrow viewing angle mode driving, the light incident from the backlight disposed on the rear surface of the first liquid crystal panel 410 passes through the first polarizing plate 411, and the light passing through the first polarizing plate 411 passes through the first polarizing plate. The light passing through the first liquid crystal layer and the second polarizing plate 412 and passing through the second polarizing plate 412 passes through the second liquid crystal panel 420 and the third polarizing plate 413, and thus light is provided only in a predetermined direction. This transmission allows the desired image to be seen only in a narrow field of view at a certain angle.

The groove 415 formed in the third substrate 403 is preferably excavated in the shape of the second substrate 402 so that the second substrate 402 can be inserted.

As a result, the present invention reduces the manufacturing cost by using one polarizing plate between the first liquid crystal panel 410 for providing the main image and the second liquid crystal panel 420 for controlling the viewing angle.

6 is a cross-sectional view illustrating a part of a liquid crystal display as a fifth embodiment according to the present invention.

As shown in FIG. 6, in the liquid crystal display according to the present invention, a groove 515a is formed on an upper surface of the second substrate 502 of the first liquid crystal panel 510, and the groove 515a corresponds to the groove 515a. An additional groove 525b is formed in the third substrate 503 of the second liquid crystal panel 520.

The groove 515a and the additional groove 515b accommodate the second polarizer 512.

The second polarizer 512 is used as a common polarizer of the first liquid crystal panel 510 and the second liquid crystal panel 520.

The first liquid crystal panel 510 and the second liquid crystal panel 520 may be aligned and fixed by the second polarizing plate 512 inserted into the groove 515a and the additional groove 515b. May be

Here, the sum of the depth from the bottom of the groove 515a to the top surface of the second substrate 502 and the depth from the bottom of the additional groove 515b to the top surface of the third substrate 503 is the thickness of the second polarizing plate ( substantially the same as d).

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

According to the present invention, when the first liquid crystal panel and the second liquid crystal panel are stacked in the emission direction of the backlight light in the liquid crystal display device, grooves are formed on the surface of one panel to insert another panel, thereby providing a first effect of light weight and thinness. .

The present invention has the second effect of selectively driving in the narrow viewing angle mode and the wide viewing angle mode.

The present invention has a third effect of reducing the manufacturing cost by using a polarizing plate in common between the first liquid crystal panel providing the main image and the second liquid crystal panel for controlling the viewing angle.

According to the present invention, the second liquid crystal panel is inserted into the recess groove of the first liquid crystal panel so that a separate fixing means is not required, thereby providing a fourth effect that is simple to manufacture and simple to assemble.

Claims (13)

A first liquid crystal panel comprising first and second substrates and a first liquid crystal layer interposed between the first and second substrates; A second liquid crystal panel disposed parallel to the second substrate surface of the first liquid crystal panel, An accommodating part is formed on an upper surface of the second substrate, and the second liquid crystal panel is inserted into the accommodating part. The method of claim 1, The second liquid crystal panel, 3rd and 4th board | substrates, and the 2nd liquid crystal layer interposed between them, The liquid crystal display device characterized by the above-mentioned. The method of claim 1, A common polarizing plate is formed between the first liquid crystal panel and the second liquid crystal panel. The method of claim 1, The first liquid crystal panel includes a thin film transistor (TFT) formed on the first substrate and a pixel electrode connected to the thin film transistor, and the second liquid crystal panel controls a viewing angle of an image provided from the first liquid crystal panel. And an adjusting means. The method of claim 1, The first liquid crystal panel includes a viewing angle adjusting means for adjusting a viewing angle of an image provided from the second liquid crystal panel, and includes a thin film transistor (TFT) and a pixel electrode connected to the thin film transistor inside the second liquid crystal panel. A liquid crystal display device, characterized in that. The method of claim 1, And the housing part is a recess formed on the second substrate. The method of claim 1, The planar shape of the housing part corresponds to the planar shape of the second liquid crystal panel. The method of claim 1, The substrate of the second liquid crystal panel facing the first liquid crystal panel further includes an additional accommodating portion, And the accommodating part and the additional accommodating part accommodate a common polarizing plate. Preparing a first liquid crystal panel and a second liquid crystal panel; And And forming an accommodating part for inserting the second liquid crystal panel on one surface of the substrate of the first liquid crystal panel. 10. The method of claim 9, And inserting the second liquid crystal panel into an accommodating part of the first liquid crystal panel. 10. The method of claim 9, Preparing the first liquid crystal panel, Forming a thin film transistor (TFT) on a first substrate of the first liquid crystal panel; Forming a pixel electrode connected to the thin film transistor on the first substrate; And Bonding the second substrate facing the first substrate, and interposing a liquid crystal layer between the first substrate and the second substrate. 10. The method of claim 9, And the receiving part is formed by selectively etching one surface of the substrate of the first liquid crystal panel. 10. The method of claim 9, In the step of forming a receiving portion for inserting the second liquid crystal panel on one surface of the substrate of the first liquid crystal panel, Forming an additional accommodating part on one surface of the substrate of the second liquid crystal panel facing the first liquid crystal panel; And And storing a common polarizer in the accommodating portion and the additional accommodating portion.

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