KR100952039B1 - Liquid crystal display device - Google Patents

Abstract

A liquid crystal display device is disclosed. The liquid crystal display device includes a first substrate and a second substrate facing each other; A first liquid crystal layer and a second liquid crystal layer interposed between the first substrate and the second substrate; A first alignment layer interposed between the first liquid crystal layer and the first substrate and for aligning the first liquid crystal layer in a first direction; And a second alignment layer interposed between the second liquid crystal layer and the first substrate to orient the second liquid crystal layer in a second direction.

Transflective, Liquid Crystal, Ferroelectric, FLC, Orientation

Description

[0001] LIQUID CRYSTAL DISPLAY DEVICE [0002]

An embodiment relates to a liquid crystal display device.

As information processing technology develops, display devices such as LCD, PDP and AMOLED are widely used. In particular, the transflective LCD may satisfy indoor and outdoor visibility at the same time.

In addition, LCDs using ferroelectric liquid crystals have improved viewing angles and excellent response speeds.

The embodiment is to provide a liquid crystal display device having improved visibility indoors and outdoors, and having a fast response speed and an improved viewing angle.

According to an exemplary embodiment, a liquid crystal display includes: a first substrate and a second substrate facing each other; A first liquid crystal layer and a second liquid crystal layer interposed between the first substrate and the second substrate; A first alignment layer interposed between the first liquid crystal layer and the first substrate and orientating the first liquid crystal layer in a first direction; And a second alignment layer interposed between the second liquid crystal layer and the first substrate to orient the second liquid crystal layer in a second direction.

In another embodiment, a liquid crystal display includes: a liquid crystal panel including a reflection area and a transmission area; And a backlight assembly disposed below the liquid crystal panel, wherein the liquid crystal panel includes a first liquid crystal layer disposed in the reflective region and oriented in the first direction; A second liquid crystal layer disposed in the transmission region and oriented in a second direction; And a reflective layer disposed under the second liquid crystal layer.

In another embodiment, a liquid crystal display includes: a first substrate; A second substrate facing the first substrate and disposed on the first substrate; A first liquid crystal layer interposed between the first substrate and the second substrate and converting light passing through the first substrate into light having a first characteristic; And a second liquid crystal layer interposed between the first substrate and the second substrate and converting the light passing through the second substrate into light having a second property.

The liquid crystal display according to the embodiment includes a transmission area and a reflection area. Therefore, the liquid crystal display according to the embodiment displays an image by using both the external light and the light of the backlight assembly, and thus has improved visibility indoors and outdoors.

In the liquid crystal display according to the embodiment, the ferroelectric liquid crystal may be used as the first liquid crystal layer and the second liquid crystal layer.

In this case, a difference in a method of displaying an image of the transmission area and the reflection area may occur. The difference may be compensated by changing the alignment directions of the first liquid crystal layer and the second liquid crystal layer.

For example, light emitted from the backlight may pass through the first liquid crystal layer once in the transmission region and external light may pass through the second liquid crystal layer twice in the reflection region so that an image may be displayed on the liquid crystal panel.

In this case, the first liquid crystal layer linearly polarizes the light passing therethrough, and the second liquid crystal layer polarizes the circular light, thereby compensating for the difference between the methods of displaying the image of the transmission region and the reflection region.

Accordingly, the liquid crystal display according to the embodiment may implement the transmission region and the reflection region by using ferroelectric liquid crystal.

Accordingly, the liquid crystal display according to the embodiment may have the advantages of the transflective liquid crystal display and the advantages of the ferroelectric liquid crystal display.

Therefore, the liquid crystal display according to the embodiment has improved visibility in indoors and outdoors, and has a fast response speed and an improved viewing angle.

In the description of the embodiment, each panel, member, electrode, layer, film, or substrate is formed on or under the "on" of each panel, member, electrode, layer, film, or substrate, and the like. When described as being "in" and "under" includes both those that are formed "directly" or "indirectly" through other components. In addition, the upper or lower reference of each component is described with reference to the drawings. The size of each component in the drawings may be exaggerated for the sake of explanation and does not mean the size actually applied.

1 is a perspective view illustrating a liquid crystal display according to an embodiment. 2 is a plan view illustrating pixels of a liquid crystal panel according to an exemplary embodiment. FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG. 2. 4 is a view illustrating a process in which light passes or is reflected through a liquid crystal display according to an exemplary embodiment.

Referring to FIG. 1, the liquid crystal display includes a liquid crystal panel 100 and a backlight assembly 200.

The liquid crystal panel 100 has a plate shape and is disposed on the backlight assembly 200. The liquid crystal panel 100 is divided into a plurality of pixels P, and displays an image by adjusting the intensity of transmitted light and reflected light in units of the pixel P. FIG.

The backlight assembly 200 is disposed below the liquid crystal panel 100. The backlight assembly 200 generates light and emits the light toward the liquid crystal panel 100. The backlight assembly 200 includes a light source 210 and a light guide plate 220.

The light source 210 generates light and emits light toward the light guide plate 220. The light source 210 is disposed on the side of the light guide plate 220. The light source 210 may be a light emitting diode, a cold cathode fluorecent lamp (CCFL), or an external electrode fluorescent lamp (EEFL).

The light guide plate 220 receives light emitted from the light source 210 and emits light toward the liquid crystal panel 100. Examples of the material used as the light guide plate 220 may include polymethylmethacrylate (PMMA), polycarbonate (PC), and the like.

In addition, the backlight assembly 200 may include an optical sheet disposed on the light guide plate 220 to improve characteristics of the emitted light.

In addition, the backlight assembly 200 may include a reflective sheet disposed under the light guide plate 220 to reflect light generated from the light source 210 upward.

In addition, the backlight assembly 200 may be a direct type. That is, the backlight assembly 200 does not include the light guide plate 220, and the light generated from the light source 210 may be directly emitted toward the liquid crystal panel 100.

Referring to FIG. 2, the pixel P includes a transmission area TA and a reflection area RA. The liquid crystal panel 100 may be driven in a passive manner.

The transmission area TA is emitted from the backlight assembly 200 to display an image by adjusting the intensity of transmitted light.

The reflection area RA reflects light incident from the outside to display an image.

Referring to FIG. 3, the liquid crystal panel 100 includes a lower substrate 110, an upper substrate 120, a lower electrode 130, an upper electrode 140, a reflective layer 150, a lower alignment layer 160, and an upper alignment layer. 170, the liquid crystal layer 180, the retardation film 191, and the polarizing sheets 192 and 193.

The lower substrate 110 is transparent and has a plate shape. The lower substrate 110 may be a glass substrate, a plastic substrate, or a quartz substrate.

The upper substrate 120 is disposed on the lower substrate. The upper substrate 120 is spaced apart from the lower substrate 110 and faces the lower substrate 110.

The upper substrate 120 is transparent and has a plate shape. The upper substrate 120 may be a glass substrate, a plastic substrate, or a quartz substrate.

The lower electrode 130 is disposed on the lower substrate 110. The lower electrode 130 is transparent and is a conductor. Examples of the material used as the lower electrode 130 may include indium tin oxide (ITO) or indium zinc oxide (IZO).

The lower electrode 130 may be disposed one for each pixel P. FIG.

The upper electrode 140 is disposed below the upper substrate 120. The upper electrode 140 faces the lower electrode 130. The upper electrode 140 is transparent and is a conductor. Examples of the material used as the upper electrode 140 include indium tin oxide or indium zinc oxide.

The upper electrode 140 may be disposed one for each pixel P. FIG.

The reflective layer 150 is disposed on the lower electrode 130. The reflective layer 150 reflects light incident from the outside upwards. The reflective layer 150 may be a metal film, and an example of a material used as the reflective layer 150 may include aluminum or silver.

The pixel P is divided into the transmission area TA and the reflection area RA by the reflective layer 150. That is, the reflective area RA is an area where the reflective layer 150 is disposed, and the transmission area TA is an area where the reflective layer 150 is not disposed.

That is, light emitted from the backlight assembly 200 may pass through the transmission area TA, but may not pass through the reflection area RA because it is blocked by the reflection layer 150.

The lower alignment layer 160 is disposed on the lower electrode 130. The lower alignment layer 160 is disposed adjacent to the liquid crystal layer 180. The lower alignment layer 160 aligns the liquid crystal layer 180. Examples of the material used as the lower alignment layer 160 may include polyimide. The lower alignment layer 160 includes a first horizontal alignment layer 161 and a first vertical alignment layer 162.

The first horizontal alignment layer 161 is disposed in the transmission area TA. The first horizontal alignment layer 161 is disposed on the lower electrode 130, and is disposed on side surfaces of the reflective layer 150 and the first vertical alignment layer 162.

The first horizontal alignment layer 161 is formed by rubbing. Accordingly, the first horizontal alignment layer 161 includes a plurality of first rubbing grooves (not shown) formed in the horizontal direction.

The first vertical alignment layer 162 is disposed in the reflection area RA. The first vertical alignment layer 162 is disposed on the reflective layer 150. The first vertical alignment layer 162 is disposed on the side surface of the first horizontal alignment layer 161. The first vertical alignment layer 162 is not rubbed.

The thickness T1 of the first horizontal alignment layer 161 is greater than the thickness T2 of the first vertical alignment layer 162. That is, since the reflective layer 150 is disposed only in the reflective region RA, the first horizontal alignment layer 161 compensates for the step T3 caused by the reflective layer 150. Therefore, the top surface of the first horizontal alignment layer 161 and the top surface of the first vertical alignment layer 162 are disposed on the same plane.

The upper alignment layer 170 is disposed below the upper electrode 140. The upper alignment layer 170 is disposed adjacent to the liquid crystal layer 180. The upper alignment layer 170 orients the liquid crystal layer 180. Examples of the material used as the upper alignment layer 170 may include polyimide. The upper alignment layer 170 may include a second horizontal alignment layer 171 and a second vertical alignment layer 172.

The second horizontal alignment layer 171 is disposed in the transmission area TA. The second horizontal alignment layer 171 is disposed under the upper electrode 140.

The second horizontal alignment layer 171 is rubbed in the horizontal direction. Accordingly, the second horizontal alignment layer 171 includes a plurality of second rubbing grooves (not shown) formed in the horizontal direction.

That is, the first horizontal alignment layer 161 and the second horizontal alignment layer 171 are rubbed in the same direction.

The second vertical alignment layer 172 is disposed under the upper electrode 140. The second vertical alignment layer 172 is disposed in the reflection area RA. The second vertical alignment layer 172 is disposed on the same layer as the second horizontal alignment layer 171.

In addition, the second horizontal alignment layer 171 and the second vertical alignment layer 172 have substantially the same thickness. Accordingly, the bottom surface of the second horizontal alignment layer 171 and the bottom surface of the second vertical alignment layer 172 are disposed on the same plane.

The second vertical alignment layer 172 is not rubbed.

The liquid crystal layer 180 is interposed between the lower substrate 110 and the upper substrate 120. In more detail, the liquid crystal layer 180 is interposed between the lower alignment layer 160 and the upper alignment layer 170. The liquid crystal layer 180 includes a ferroelectric liquid crystal (FLC). In addition, the liquid crystal layer 180 may have a bistable property.

The liquid crystal layer 180 includes a first liquid crystal layer 181 and a second liquid crystal layer 182.

The first liquid crystal layer 181 is disposed in the transmission area TA. That is, the first liquid crystal layer 181 is interposed between the first horizontal alignment layer 161 and the second horizontal alignment layer 171.

Accordingly, the first liquid crystal layer 181 is aligned in the direction in which the first horizontal alignment layer 161 and the second horizontal alignment layer 171 are rubbed. That is, the first horizontal alignment layer 161 and the second horizontal alignment layer 171 align the first liquid crystal layer 181 in the horizontal direction.

The second liquid crystal layer 182 is disposed in the reflection area RA. That is, the second liquid crystal layer 182 is interposed between the first vertical alignment layer 162 and the second vertical alignment layer 172.

In this case, since the first vertical alignment layer 162 and the second vertical alignment layer 172 are not rubbed, the second liquid crystal layer 182 is aligned in the vertical direction. That is, the first vertical alignment layer 162 and the second vertical alignment layer 172 align the second liquid crystal layer 182 in the vertical direction.

The polarizing sheets 192 and 193 polarize light passing therethrough.

The first polarizing sheet 192 is disposed below the lower substrate 110. The first polarizing sheet 192 converts the light passing through the first linearly polarized light polarized parallel to the first optical axis.

The second polarizing sheet 193 is disposed on the upper substrate 120. The second polarizing sheet 193 converts the light passing through the second linearly polarized light ↔ polarized in parallel to the second optical axis.

In this case, the first optical axis and the second optical axis are perpendicular to each other.

The retardation film 191 is disposed between the first polarizing sheet 192 and the lower substrate 110. The retardation film 191 is a 0.5λ film.

A driving method of the liquid crystal display according to the embodiment is as follows.

Position of light ① ② ③ ④ ⑤ Optical properties random ↕ ↔ ↔ White Position of light ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ Optical properties random ↔ ↔ ↔ ↔ White

Table 1 describes the characteristics of the light shown in FIG. 4 when no electric field is formed.

Referring to Table 1 and FIG. 4, when no electric field is formed between the lower electrode 130 and the upper electrode 140, the first liquid crystal layer 181 and the second liquid crystal layer 182 may be formed. The state aligned in the horizontal direction and the vertical direction is maintained, and the characteristics of the light passing through are not changed.

Therefore, the light emitted from the backlight assembly 200 passes through the first polarizing sheet 192 and is converted into first linearly polarized light.

Thereafter, the first linearly polarized light passing through the first polarizing sheet 192 is converted into the second linearly polarized light ↔ while passing through the retardation film 191.

Subsequently, the light passing through the retardation film 191 passes through the first liquid crystal layer 181 and the second polarizing sheet 193 to implement white color in the transmission area TA.

In addition, the light incident from the outside into the reflective region RA passes through the second polarizing sheet 193 and is converted into second linearly polarized light ↔.

Thereafter, the characteristic does not change due to two passes of the second liquid crystal layer 182 and reflection by the reflective layer 150.

Accordingly, the second linearly polarized light ↔ reflected by the reflective layer 150 passes through the second liquid crystal layer 182 and the second polarizing sheet 193 to implement white color in the reflective region RA.

As a result, when no electric field is formed between the lower electrode 130 and the upper electrode 140, both the reflection area RA and the transmission area TA realize white.

Position of light ① ② ③ ④ ⑤ Optical properties random ↕ ↔ ↕ black Position of light ⑥ ⑦ ⑧ ⑨ ⑩ ⑪ Optical properties random ↔ U-Polar Polarization Left circular polarization ↕ black

Table 2 describes the characteristics of the light shown in FIG. 4 when an electric field is formed.

4 and 2, an electric field is formed in the lower electrode 130 and the upper electrode 140. Accordingly, the liquid crystals included in the first liquid crystal layer 181 may rotate by 45 ° in the horizontal direction.

In addition, the liquid crystals included in the second liquid crystal layer 182 may rotate by 45 ° in the vertical direction.

Therefore, the first liquid crystal layer 181 passes through linearly polarized light. That is, the first liquid crystal layer 181 converts the first linearly polarized light ↕ through to the second linearly polarized light ↔ and converts the second linearly polarized light ↔ through to the first linearly polarized light.

The second liquid crystal layer 182 circularly polarizes the light passing therethrough. That is, the second linearly polarized light ↔ is converted into right circularly polarized light.

In more detail, a process of displaying an image by the transmission area TA and the reflection area RA will be described.

Light emitted from the backlight assembly 200 passes through the first polarizing sheet 192 and is converted into first linearly polarized light.

Thereafter, the first linearly polarized light passing through the first polarizing sheet 192 is converted into the second linearly polarized light ↔ while passing through the retardation film 191.

Thereafter, the second linearly polarized light ↔ having passed through the retardation film 191 is converted into the first linearly polarized light while passing through the first liquid crystal layer 181.

Since the light passing through the first liquid crystal layer 181 is the first linearly polarized light, black does not pass through the second polarizing sheet 193 and black is formed in the transmission area TA.

Light incident from the outside into the reflective region RA passes through the second polarizing sheet 193 and is converted into second linearly polarized light ↔.

Thereafter, the second linearly polarized light ↔ having passed through the second polarizing sheet 193 passes through the second liquid crystal layer 182 and is converted into right circularly polarized light.

Thereafter, the right circularly polarized light that has passed through the second liquid crystal layer 182 is reflected by the reflective layer 150, and is converted into left circularly polarized light.

Thereafter, the left circularly polarized light reflected by the reflective layer 150 passes through the second liquid crystal layer 182 and is converted into first linearly polarized light.

Since the light passing through the second liquid crystal layer 182 is the first linearly polarized light, the light does not pass through the second polarizing sheet 193, and white is formed in the reflective region RA.

As a result, when an electric field is formed in the lower electrode 130 and the upper electrode 140, both the transmission area TA and the reflection area RA realize black.

Therefore, the liquid crystal display according to the exemplary embodiment displays an image through both the transmission area TA and the reflection area RA, thereby improving visibility of indoors and outdoors.

In addition, the liquid crystal display according to the embodiment displays an image by driving the liquid crystal layer 180 including the ferroelectric liquid crystal.

Accordingly, the liquid crystal display according to the embodiment realizes an improved viewing angle and a fast response speed.

That is, since the liquid crystal display according to the embodiment implements the transflective liquid crystal display using ferroelectric liquid crystal, the liquid crystal display according to the embodiment has the advantages of the ferroelectric liquid crystal display and the advantages of the transflective liquid crystal display. .

5A through 5F are cross-sectional views illustrating a method of manufacturing a liquid crystal display device according to an embodiment.

Referring to FIG. 5A, a transparent metal layer is formed on a transparent and insulator lower substrate 110, and the transparent metal layer is patterned to form a lower electrode 130.

Thereafter, an aluminum layer covering the lower substrate 110 is formed and patterned to form a reflective layer 150. In this case, the lower substrate 110 is divided into a transmission area TA and a reflection area RA by the reflective layer 150.

Referring to FIG. 5B, a first polyimide layer is selectively formed in the transmission area TA. The first polyimide layer is formed by a stamping method or an inkjet printing method.

That is, a polyimide pattern may be formed on the stamp, and the polyimide pattern may be selectively transferred to the transmission area TA and the lower electrode 130 to form the first polyimide layer.

In addition, a polyimide liquid is selectively applied to the transmission area TA and the lower electrode 130 by an inkjet device, thereby forming the first polyimide layer.

Thereafter, the first polyimide layer is rubbed in a horizontal direction, and a first horizontal alignment layer 161 is formed in the transmission area TA and on the lower electrode 130 through a thermosetting or photocuring process. .

Referring to FIG. 5C, a first vertical alignment layer 162 is formed on the reflective layer 150. Similarly, the first vertical alignment layer 162 is coated with a polyimide by a stamping method or an inkjet printing method, and is formed through a thermosetting or photocuring process.

In this case, the thickness T1 of the first horizontal alignment layer 161 corresponds to the sum of the thickness T2 of the first vertical alignment layer 162 and the thickness T3 of the reflective layer 150.

Referring to FIG. 5D, a transparent metal layer is formed on the transparent and insulator upper substrate 120, and the transparent metal layer is patterned to form the upper electrode 140.

Thereafter, a second polyimide layer is selectively formed in the transmission area TA. Similarly, the second polyimide layer is formed by a stamping method or an inkjet printing method.

Thereafter, the second polyimide layer is rubbed in the horizontal direction, and a second horizontal alignment layer 171 is formed in the transmission area TA and on the upper electrode 140 through a thermosetting or photocuring process. do.

Referring to FIG. 5E, a second vertical alignment layer 172 is formed on the reflective region RA and the upper electrode 140. Similarly, the second vertical alignment layer 172 is coated with a polyimide by a stamping method or an inkjet printing method, and is formed through a thermosetting or photocuring process.

Referring to FIG. 5F, the lower substrate 110 and the upper substrate 120 are disposed to be spaced apart from and opposed to each other, and are coupled to each other by a sealing member (not shown).

Thereafter, the ferroelectric liquid crystal is heated to an isotropic or nematic state.

Thereafter, the liquid crystal of the isotropic or nematic state is injected between the lower substrate 110 and the upper substrate 120.

Then, the temperature of the injected ferroelectric liquid crystal is lowered at a rate of 1 to 5 ℃ / min.

In this case, the first liquid crystal layer 181 of the transmission area TA is aligned in the horizontal direction by the first horizontal alignment layer 161 and the second horizontal alignment layer 171.

In addition, the second liquid crystal layer 182 of the reflection area RA is aligned in the vertical direction by the first vertical alignment layer 162 and the second vertical alignment layer 172.

Then, a retardation film 191 is attached to the lower substrate 110, the first polarizing sheet 192 and the second polarizing sheet (192) and below the retardation film 191 and on the upper substrate 120, respectively 193 is attached.

Thereafter, the backlight assembly 200 is disposed below the liquid crystal panel 100 formed as described above.

Accordingly, a liquid crystal display device using a ferroelectric liquid crystal and displaying an image through the transmission area TA and the reflection area RA is provided by the manufacturing method of the liquid crystal display device according to the embodiment.

The liquid crystal display according to the embodiment has all the advantages of a transflective liquid crystal display and a ferroelectric liquid crystal display.

Therefore, the liquid crystal display according to the embodiment has excellent visibility indoors and outdoors, and has a wide viewing angle and a fast response speed.

Although described above with reference to the embodiment is only an example and is not intended to limit the invention, those of ordinary skill in the art to which the present invention does not exemplify the above within the scope not departing from the essential characteristics of this embodiment It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiment can be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

1 is a perspective view illustrating a liquid crystal display according to an embodiment.

2 is a plan view illustrating pixels of a liquid crystal panel according to an exemplary embodiment.

FIG. 3 is a cross-sectional view taken along the line A-A 'of FIG. 2.

4 is a view illustrating a process in which light passes or is reflected through a liquid crystal display according to an exemplary embodiment.

5A through 5F are cross-sectional views illustrating a method of manufacturing a liquid crystal display device according to an embodiment.

Claims (16)

A first substrate; A second substrate facing the first substrate and disposed on the first substrate; A first liquid crystal layer and a second liquid crystal layer interposed between the first substrate and the second substrate; A first alignment layer interposed between the first liquid crystal layer and the first substrate and orientating the first liquid crystal layer in a first direction; A second alignment layer interposed between the second liquid crystal layer and the first substrate and orientating the second liquid crystal layer in a second direction; A reflection layer corresponding to the second liquid crystal layer and disposed on the first substrate; A first polarizing sheet disposed below the first substrate; A second polarizing sheet disposed on the second substrate; And It comprises a 0.5λ retardation film interposed between the first liquid crystal layer and the first polarizing sheet, And the first liquid crystal layer and the second liquid crystal layer include ferroelectric liquid crystals. delete delete The liquid crystal display of claim 1, wherein the first direction is a direction parallel to the first alignment layer, and the second direction is a direction perpendicular to the alignment layer. The liquid crystal display of claim 1, wherein the first alignment layer comprises rubbing grooves formed in the first direction. The liquid crystal display of claim 1, wherein the first alignment layer and the second alignment layer are disposed on the same layer. A liquid crystal panel including a reflection area and a transmission area; And It includes a backlight assembly disposed below the liquid crystal panel, The liquid crystal panel A first liquid crystal layer disposed in the reflection area and oriented in a first direction; A second liquid crystal layer disposed in the transmission region and oriented in a second direction; A reflective layer disposed under the first liquid crystal layer; A first polarization layer disposed under the first liquid crystal layer and the second liquid crystal layer; A second polarization layer disposed on the first liquid crystal layer and the second liquid crystal layer; And A 0.5λ retardation film disposed between the second liquid crystal layer and the first polarization layer, And the first liquid crystal layer and the second liquid crystal layer include ferroelectric liquid crystals. delete delete The liquid crystal panel of claim 7, wherein the liquid crystal panel comprises: a first alignment layer which is rubbed in the first direction and is adjacent to the first liquid crystal layer; And And a second alignment layer adjacent to the second liquid crystal layer. The liquid crystal display of claim 7, wherein the transmission area displays an image using light emitted from the backlight assembly, and the reflection area displays an image using light incident from the outside. The liquid crystal display of claim 7, wherein the first liquid crystal layer and the second liquid crystal layer are disposed in the same layer. A first substrate; A second substrate facing the first substrate and disposed on the first substrate; A first liquid crystal layer interposed between the first substrate and the second substrate and converting light passing through the first substrate into light having a first characteristic; A second liquid crystal layer interposed between the first substrate and the second substrate and converting light passing through the second substrate into light having a second property; A reflective layer disposed under the second liquid crystal layer; A first polarizing sheet disposed below the first substrate; A second polarizing sheet disposed on the second substrate; And It comprises a 0.5λ retardation film interposed between the first liquid crystal layer and the first polarizing sheet, And the first liquid crystal layer and the second liquid crystal layer have bistable stability. The liquid crystal display of claim 13, wherein the first liquid crystal layer linearly polarizes light passing through and the second liquid crystal layer circularly polarizes light passing through. delete The liquid crystal display device of claim 14, further comprising: a first electrode disposed under the first liquid crystal layer and the second liquid crystal layer; And And a second electrode disposed on the first liquid crystal layer and the second liquid crystal layer.

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