WO2019112131A1

WO2019112131A1 - Display device and control method therefor

Info

Publication number: WO2019112131A1
Application number: PCT/KR2018/008148
Authority: WO
Inventors: 이선락; 정용민
Original assignee: 삼성전자주식회사
Priority date: 2017-12-06
Filing date: 2018-07-19
Publication date: 2019-06-13
Also published as: KR20190066968A

Abstract

A display device is disclosed. The display device comprises: a liquid crystal layer including a cholesteric liquid crystal; and a substrate having an electrode for applying a voltage to the cholesteric liquid crystal, wherein an initial state of the cholesteric liquid crystal is a focal conic state having transmittance greater than or equal to a preset value.

Description

Display device and control method thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device and a control method thereof, and more particularly, to a display device including a cholesteric liquid crystal and a control method thereof.

The liquid crystal used in the conventional liquid crystal display device includes a twisted nematic liquid crystal, a semetic liquid crystal, and a cholesteric liquid crystal.

Double cholesteric liquid crystals have been used in reflective display devices. Specifically, the cholesteric liquid crystal changes into three states consisting of two stable states, a planar state, a focal conic state, and a homeotropic state other than the planar state, focal conic state, and homeotropic state. .

In addition, the cholesteric liquid crystal can selectively reflect the light with respect to the external light, and in particular, in the state transition of the cholesteric liquid crystal, a focal conic state in which external light is scattered and a planar state in which external light is reflected And has been used for a reflective display device.

On the other hand, in the homeotropic state, the backlight of the liquid crystal display device can be provided to the user by transmitting external light. In this case, a search for a method to provide a natural background is requested.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a display device capable of setting the initial state of a cholesteric liquid crystal to a focal conic state having a transmittance equal to or higher than a predetermined value and delivering a natural background in accordance with the state transition of the cholesteric liquid crystal And a control method thereof.

According to an aspect of the present invention, there is provided a display device including a liquid crystal layer including a cholesteric liquid crystal and a substrate provided with an electrode for applying a voltage to the cholesteric liquid crystal, The initial state of the liquid crystal is a focal conic state having a transmittance of a predetermined value or more.

In this case, the liquid crystal layer further includes a monomer, and the initial state of the cholesteric liquid crystal is determined by firstly arranging the cholesteric liquid crystal by a polymer network formed by irradiating ultraviolet rays to the liquid crystal layer, It can be set according to the voltage applied to the steric liquid crystal.

The substrate includes a first substrate and a second substrate oppositely disposed to the first substrate. The electrode includes a first electrode provided on one surface of the first substrate facing the second substrate, And a second electrode provided on one surface of the second substrate facing the substrate, the liquid crystal layer being disposed between the first substrate and the second substrate.

In this case, the display device according to the present embodiment includes a panel driver for applying a voltage to the cholesteric liquid crystal in the initial state through the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode .

The cholesteric liquid crystal in the initial state is switched to a planar state when a first voltage is applied through a plurality of electrodes of the first electrode and a plurality of electrodes of the second electrode, And a second voltage may be applied to the second electrode through the plurality of electrodes of the second electrode.

According to another aspect of the present invention, there is provided a method of controlling a display device including applying a voltage to a cholesteric liquid crystal through a substrate provided with electrodes, displaying an image according to application of the voltage, Wherein the initial state of the cholesteric liquid crystal is a focal conic state having a transmittance of a predetermined value or more.

In this case, the control method according to the present embodiment may further include the step of applying a voltage to the cholesteric liquid crystal in the initial state through the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode .

According to another aspect of the present invention, there is provided a method of manufacturing a display device, comprising: providing a first substrate on which a plurality of electrodes are patterned; coating a liquid crystal layer including a cholesteric liquid crystal and a monomer on the first substrate A step of forming a second substrate on which a plurality of electrodes are patterned on the liquid crystal layer, a step of irradiating the liquid crystal layer with ultraviolet light, and a step of irradiating the ultraviolet- And the initial state of the cholesteric liquid crystal is a focal conic state having a transmittance of a predetermined value or more.

In this case, in the step of applying the voltage, in order to convert the cholesteric liquid crystal turned into the planar state according to the irradiation of the ultraviolet ray into a focal conic state having a transmittance of a predetermined value or more, As shown in FIG.

According to the various embodiments of the present invention as described above, it is possible to provide a natural background without a sense of heterogeneity.

1 is a view for explaining a structure of a display device according to an embodiment of the present invention,

2 is a view for explaining a cholesteric liquid crystal molecule according to an embodiment of the present invention,

3 is a view for explaining an image of a cholesteric liquid crystal according to an embodiment of the present invention,

FIGS. 4 and 5 are views for explaining a method of manufacturing a display device according to an embodiment of the present invention, and FIGS.

6 is a flowchart illustrating a method of controlling a display apparatus according to an embodiment of the present invention.

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These embodiments are capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the description. It is to be understood, however, that it is not intended to limit the scope of the specific embodiments but includes all transformations, equivalents, and alternatives falling within the spirit and scope of the disclosure disclosed. In the following description of the exemplary embodiments of the present invention, detailed description of known technologies will be omitted if they are deemed to be clouded.

The terms first, second, etc. may be used to describe various elements, but the elements should not be limited by terms. Terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the claims. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term "includes" Or "configured." , Etc. are intended to designate the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, may be combined with one or more other features, steps, operations, components, It should be understood that they do not preclude the presence or addition of combinations thereof.

1 is a view for explaining a structure of a display device according to an embodiment of the present invention.

Referring to FIG. 1, a display device 100 includes a liquid crystal layer 110 and a substrate 120.

The liquid crystal layer 110 includes a cholesteric liquid crystal 111. The liquid crystal layer 110 may include a photopolymerizable polymer cured to fix the pitch (P) of the cholesteric liquid crystal 111.

The cholesteric liquid crystal 111 may be formed by mixing a chiral dopant inducing a periodic helix structure in a nematic liquid crystal compound.

Nematic liquid crystal compounds are non-photo sensitive liquid crystal compounds that are not polymerized or decomposed by light. Therefore, even when light is irradiated, the nematic liquid crystal compound can be maintained in a monomer form without being polymerized or decomposed, and can be oriented in a certain direction by voltage application or the like.

Chiral dopants can be photo sensitive chiral dopants that react with ultraviolet light. The photosensitive chiral dopant is a compound which reacts with light to exhibit chiral properties, and is a photopolymerizable chiral dopant that can be polymerized by light, a photodegradable chiral dopant that can be decomposed by light, Lt; RTI ID = 0.0 > chelated < / RTI > dopant or a combination thereof.

Photosensitive chiral dopants can change the helical twisting power (HTP) of a molecule when it absorbs light. For example, in the case of a photoisomerizable chiral dopant, the helical twisting force can be reduced or increased as the trans form is isomerized into the cis form or vice versa in the structure while absorbing light.

On the other hand, the cholesteric liquid crystal molecules repeat the twisting of molecules at regular intervals as shown in Fig. At this time, the length of repeating the twist of the molecule is referred to as a pitch (P), and it can have a characteristic of selectively reflecting light according to the twisted direction and the repeating structure of the spiral.

Here, the pitch is controlled according to the content of the chiral dopant. As the content of the chiral dopant increases, the pitch decreases and the reflection wavelength band becomes shorter. As the content of the chiral dopant decreases, .

On the other hand, the photopolymerizable polymer fixes the helical pitch on the cholesteric liquid crystal 110. The photopolymerizable polymer is provided in the form of a monomer when the display device 100 is manufactured. When light (ultraviolet rays, UV) is irradiated to the monomer, the photopolymerizable polymer is polymerized by a photopolymerization initiator and a cross- To form a polymer network.

The polymer network is formed differently depending on the amount of light provided, and the size of the spiral pitch can be determined according to the degree of formation of the polymer network. That is, as the amount of light to be provided increases, the degree of formation of the polymer network becomes complicated. When the polymer network is complicatedly formed, the size of the pitch becomes larger and the reflection wavelength band becomes longer.

On the other hand, in a cholesteric liquid crystal, the wavelength band of the reflected light differs depending on the pitch.

For example, when the pitch of the cholesteric liquid crystal is p1, the light in the first wavelength range can be reflected. When the pitch of the cholesteric liquid crystal is p2, the light in the second wavelength range is reflected And when the pitch of the collexer liquid crystal is p2, the light in the third triangular region can be reflected. Here, when p1 < p2 < p3, the first wavelength region is a short wavelength region, the third wavelength region is a long wavelength region, and the second wavelength region may be a wavelength region between the first wavelength region and the third wavelength region . For example, the first wavelength region may be a blue wavelength region, the second wavelength region may be a green wavelength region, and the third wavelength region may be a red wavelength region.

Accordingly, in the display device including the red pixel, the green pixel and the blue pixel, the pitch of the cholesteric liquid crystal constituting the red pixel is adjusted to be the longest and the pitch of the cholesteric liquid crystal constituting the blue pixel is adjusted to be the shortest And the wavelength region of the light reflected by the liquid crystal layer 110 can be selectively controlled by adjusting the pitch of the cholesteric liquid crystal constituting the green pixel to a medium degree.

The substrate 120 is provided with an electrode 130 for applying a voltage to the cholesteric liquid crystal 111.

Specifically, the substrate 120 may include a first substrate 121 and a second substrate 122 disposed opposite the first substrate 121. In this case, the liquid crystal layer 110 may be disposed between the first substrate 121 and the second substrate 122.

At this time, the first substrate 121 and the first substrate 121 may be made of glass or a transparent plastic material having flexibility. In this case, polycarbonate may be used as an example of the plastic material. In addition, the plastic may be implemented with silicon, silicon oxide, silicon carbide, and polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and the like.

The electrode 130 includes a first electrode 131 provided on one surface of the first substrate 121 facing the second substrate 122 and a second electrode 122 facing the first substrate 121 And a second electrode 132 provided on one surface.

The first electrode 131 may include a plurality of electrodes patterned at predetermined intervals on one surface of the first substrate 121 and the second electrode 132 may include a plurality of electrodes patterned on one surface of the second substrate 122 And a plurality of electrodes patterned at predetermined intervals.

In this case, the plurality of electrodes of the first electrode 131 and the plurality of electrodes of the second electrode 132 may cross each other at right angles. At this time, the intersecting portion may form one pixel. Accordingly, a voltage may be applied to the first electrode 131 and the second electrode 132 to apply a voltage to a pixel to be controlled.

In this way, the display device 100 can be implemented in a passive matrix manner. In addition, the display device 100 may be implemented in an active matrix manner, including a switching element such as a transistor for each pixel.

In this case, the display device 100 may include a TFT panel (not shown) having transistors for driving the pixels on the first substrate 121. Transistors (not shown) for switching individual pixels may be formed in such a TFT panel. At this time, a common electrode (not shown) for forming an electric field in the liquid crystal layer 110 may be formed on the second substrate 122 together with the output voltage of the transistor. At this time, the common electrode may be formed of a transparent conductive material.

Meanwhile, the first electrode 131 and the second electrode 132 may be implemented as a transparent electrode. For example, the transparent electrode may be formed of a transparent conductive material. The transparent conductive material may include indium tin oxide (ITO), indium zinc oxide (IZO), aluminum doped zinc oxide Aluminum-doped zinc oxide (ZAO), or the like.

On the other hand, the cholesteric liquid crystal 111 has three phase states consisting of two stable states planar state, focal conic state, and homeotropic state state transition or phase transition.

That is, the cholesteric liquid crystal 110 has a planar state capable of reflecting or scattering light even in the absence of an electric field, and a bistability that can exist in a focal conic state. When a sufficient electric field is applied, It can be in a homeotropic state. In this case, the cholesteric liquid crystal may be switched between two stable states of the focal conic state and the planar state.

3 is a view for explaining an image of a cholesteric liquid crystal according to an embodiment of the present invention.

3 (a) shows the arrangement state of the cholesteric liquid crystal 111 when the homeotropic liquid crystal 111 has a homeotropic state. In the homeotropic state, the cholesteric liquid crystal 111 is incident on the first and

second substrates

121 , 131 in the vertical direction. In this case, in the homeotropic state, the cholesteric liquid crystal 110 can transmit incident light.

3 (b) shows the arrangement state of the cholesteric liquid crystal 111 when the liquid crystal 111 has a focal conic state. In the focal conic state, the helical axis of the cholesteric liquid crystal 111 is aligned with the first and / And may be randomly arranged with respect to the second substrate 121 (131). In this case, in the focal conic state, the cholesteric liquid crystal 110 can scatter incident light.

3 (c) shows the arrangement state of the cholesteric liquid crystal 111 when the planar state is maintained. In the planar state, the helical axis of the cholesteric liquid crystal 111 is parallel to the first and

second substrates

121, 131 in the vertical direction. That is, the cholesteric liquid crystals 111 may be arranged in the horizontal direction on the first and

second substrates

121 and 131. In this case, in the planar state, the cholesteric liquid crystal 111 can reflect incident light.

As described above, the cholesteric liquid crystal 111 can reflect, scatter, or transmit light incident through a phase change, and this phase change can be detected by a voltage applied to the colesteric liquid crystal 111 through the electrode 120 .

Meanwhile, according to an embodiment of the present invention, the initial state of the cholesteric liquid crystal 111 may be a focal conic state having a predetermined transmittance or more. That is, the cholesteric liquid crystal 111 may be in a focal-conic state having a transmittance equal to or greater than a predetermined value even in the initial state in which no voltage is applied.

Here, having a transmittance higher than a predetermined value may have the following meaning.

For example, when a voltage is applied to a cholesteric liquid crystal in a planar state, the cholesteric liquid crystal can be converted into a homeotropic state. In this case, the cholesteric liquid crystal can be converted into a homeotropic state, The state can be viewed as a focal conic state.

In this case, depending on whether the focal conic state is close to the planar state or close to the homeotropic state, the transmissivity and the reflectance may be different from each other even in the focal conic state.

Here, the transmittance may mean the ratio of the output light to the incident light, and the reflectance may mean the ratio of the incident light to the reflected light.

Specifically, in the planar state, the incident light is reflected, and in the homeotropic state, incident light is transmitted. Therefore, the focal conic state near the homeotropic state has a higher transmittance than the focal conic state near the planar state , And the reflectance may be relatively low. Further, the focal conic state close to the planar state may have a relatively low transmittance and a relatively high reflectance than the focal conic state close to the homeotropic state.

In such a case, the fact that the cholesteric liquid crystal 111 is in the focal conic state having a predetermined transmittance or more may mean that it is in a focal conic state closer to the homeotropic state than the planar state. Therefore, the initial state of the cholesteric liquid crystal 111 may be a focal-conic state having a transmittance of a certain level or higher, or a focal conic state whose transmittance is higher than that of the reflectance.

The reason why the initial state of the cholesteric liquid crystal 111 is set to the focal-conic state with a predetermined transmittance or higher is described later.

The display device 100 includes a plurality of electrodes of the first electrode 131 and a plurality of electrodes of the second electrode 132 to apply a voltage to the cholesteric liquid crystal 111 in an initial state, (Not shown). That is, the liquid crystal layer 110 and the substrate 120 constitute a display panel, and a panel driver (not shown) applies a voltage to drive the display panel.

In this case, the display apparatus 100 may further include a processor (not shown) for controlling driving of a panel driving unit (not shown) to apply a voltage to the cholesteric liquid crystal 111. [

The cholesteric liquid crystal 111 in the initial state is switched to the planar state when a first voltage is applied through the plurality of electrodes of the first electrode 131 and the plurality of electrodes of the second electrode 132, When the second voltage is applied through the plurality of electrodes of the first electrode 131 and the plurality of electrodes of the second electrode 132, it may be converted into a homeotropic state.

Here, since the initial state of the cholesteric liquid crystal 111 is a focal conic state, a processor (not shown) applies a vertical electric field or a horizontal electric field to the cholesteric liquid crystal 111 through a panel driving unit , Thereby converting the cholesteric liquid crystal 111 into a homeotropic state.

Here, when the difference between the voltage applied to the first electrode 131 and the voltage applied to the second electrode 132 is greater than a predetermined first reference voltage, the vertical electric field is applied to the first electrode 131 And the second electrode 132. In this case, In this manner, the transition from the focal conic state to the homeotropic state by the vertical electric field is a case where the cholesteric liquid crystal 111 is realized as a positive liquid crystal.

On the other hand, when the difference between the voltages applied to the plurality of electrodes of the first electrode 131 or the plurality of electrodes of the second electrode 132 is greater than a predetermined second reference voltage, And may mean an electric field formed between a plurality of electrodes arranged. In this way, the transition from the focal conic state to the homeotropic state by the horizontal electric field is a case where the cholesteric liquid crystal 111 is implemented as a negative liquid crystal.

Meanwhile, a processor (not shown) may apply a horizontal electric field or a vertical electric field to switch the state of the cholesteric liquid crystal 111 from the homeotropic state to the focal conic state.

For example, a processor (not shown) applies a horizontal electric field when the cholesteric liquid crystal 111 is implemented as a positive liquid crystal, and applies a vertical electric field when the cholesteric liquid crystal 111 is implemented as a negative liquid crystal The cholesteric liquid crystal 111 in a homeotropic state can be converted into a focal conic state.

In the meantime, since the initial state of the cholesteric liquid crystal 111 is a focal conic state, a processor (not shown) applies a horizontal electric field or a vertical electric field to the cholesteric liquid crystal 111 through a panel driving unit , The cholesteric liquid crystal 111 can be switched to the planar state.

For example, a processor (not shown) applies a horizontal electric field when the cholesteric liquid crystal 111 is implemented as a positive liquid crystal, and applies a vertical electric field when the cholesteric liquid crystal 111 is implemented as a negative liquid crystal The cholesteric liquid crystal 111 in the focal conic state can be switched to the planar state.

A processor (not shown) applies a vertical electric field when the cholesteric liquid crystal 111 is realized by a positive liquid crystal, and applies a horizontal electric field when the cholesteric liquid crystal 111 is implemented by a negative liquid crystal, The cholesteric liquid crystal 111 in the planar state can be switched to the focal conic state.

As described above, the processor (not shown) can change the state of the cholesteric liquid crystal 111 by applying a voltage to the cholesteric liquid crystal 111. [

Accordingly, the display device 100 can display the image or provide the background of the display device 100 to the user through the change of the state of the cholesteric liquid crystal 111. [

For example, a processor (not shown) may cause the cholesteric liquid crystal 111 to be in a homeotropic state, thereby providing a background to the user of the display device 100.

Here, when another display device such as a TV exists in the rear of the display device 100 and another display device displays the image, the light emitted from the other display device can be transmitted through the display device 100, Accordingly, the user can view the image displayed on the other display device.

A processor (not shown) reflects or scatters the incident light so that the cholesteric liquid crystal 111 becomes a planar state or a focal conic state (e.g., a focal conic state with a relatively high reflectance) can do. At this time, due to the characteristics of the cholesteric liquid crystal, after the image is displayed on the display device 100, the state can be maintained without applying an additional voltage. Accordingly, even if another display device existing behind the display device 100 is turned off, an image can be displayed through the display device 100 to provide a user with an effect of functioning like a frame as another display device .

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

4 is a flowchart illustrating a method of manufacturing a display device according to an embodiment of the present invention.

First, a first substrate on which a plurality of electrodes are patterned is provided (S410). For example, as shown in FIG. 5A, the first substrate 121 may be made of PET. A plurality of electrodes 131 made of ITO are formed on one surface of the first substrate 121 Spacing.

Then, a liquid crystal layer including a cholesteric liquid crystal and a monomer is coated on the first substrate (S420). Accordingly, the liquid crystal layer 110 may be formed on the first substrate 121 on which the plurality of electrodes 131 are patterned, as shown in FIG. 5 (b).

Then, a second substrate on which a plurality of electrodes are patterned is formed on the liquid crystal layer (S430). For example, as shown in FIG. 5C, a second substrate 122, on which a plurality of electrodes 132 made of ITO are patterned at predetermined intervals, may be formed on the liquid crystal layer 110 Accordingly, the liquid crystal layer 110 may be disposed between the first substrate 121 and the second substrate 122. In this case, the second substrate 122 may be made of PET.

In the above example, the first substrate is provided first, the liquid crystal layer is coated on the first substrate, and then the second substrate is formed on the liquid crystal layer. However, this is merely an example, The substrate and the second substrate may be provided first, and the liquid crystal layer may be injected between the first substrate and the second substrate.

Then, the liquid crystal layer 110 is irradiated with ultraviolet rays (UV) (S440). For example, as shown in FIG. 5 (d), the liquid crystal layer 110 can be exposed through the ultraviolet ray 510. Through such a UV curing process, the monomer contained in the liquid crystal layer 110 can be cured, and a polymer network can be formed. At this time, the pitch of the cholesteric liquid crystal can be controlled by the difference in exposure intensity (that is, the difference in light amount), the difference in exposure temperature, the difference in polymerization rate, and the like.

Then, in order to set the initial state of the cholesteric liquid crystal, a predetermined voltage is applied to the liquid crystal layer irradiated with ultraviolet rays (S450). For example, a voltage may be applied to the liquid crystal layer 110 as shown in FIG. 5 (e).

Specifically, when the UV curing process is performed, the cholesteric liquid crystal can be in the planar state. Accordingly, by applying a voltage to the liquid crystal layer 110, the state of the cholesteric liquid crystal can be switched to the focal conic state as shown in Fig. 5 (f). That is, a predetermined voltage is applied to the cholesteric liquid crystal in order to change the planar state of the cholesteric liquid crystal that has become the planar state according to the irradiation of the ultraviolet ray to the focal conic state having a transmittance of a predetermined value or more.

As described above, the initial state of the cholesteric liquid crystal can be set according to the voltage applied to the cholesteric liquid crystal after the cholesteric liquid crystal is primarily arranged by the polymer network formed by irradiating the liquid crystal layer with ultraviolet light.

The reason for setting the initial state of the cholesteric liquid crystal to the focal conic state is as follows.

Specifically, in order to change the state of the cholesteric liquid crystal, a voltage is applied to the cholesteric liquid crystal via the electrode. In this case, the voltage is not properly applied to the cholesteric liquid crystal disposed between the electrodes, May not be changed.

For example, when a cholesteric liquid crystal is converted from a planar state to a homeotropic state, a cholesteric liquid crystal located in a region where an electric field is formed according to a voltage applied to the electrode may be converted to a homeotropic state. However, the electric field is not applied to the cholesteric liquid crystal disposed between the electrodes, so that the planar state can still be maintained.

In such a case, since the cholesteric liquid crystal in which the planar state is maintained reflects light, there is a problem that the region can be seen by the user.

For example, the cholesteric liquid crystal converted into the homeotropic state can transmit light to provide the background of the display device 100 to the user. At this time, when another display device existing behind the display device 100 displays an image or is driven to be black, the user can see an image or black color displayed by the other display device.

However, since the area that does not convert to the homeotropic state and maintains the planar state reflects the light, it is preferable that the area is displayed in black or black according to an image displayed by another display device or an end of driving of another display device It can be displayed to the user differently, and a sense of heterogeneity can be given.

On the other hand, when the initial state of the cholesteric liquid crystal is a focal conic state with a high transmittance, even though the cholesteric liquid crystal existing between the electrodes can not be converted to the homeotropic state, the transmittance is relatively high, There is a high possibility that the user does not feel the difference between the region where the cholesteric liquid crystal remains in the focal conic state and the region where the cholesteric liquid crystal is converted into the homeotropic state, It is possible to provide a natural background with less sense of heterogeneity.

First, a voltage is applied to the cholesteric liquid crystal through the substrate provided with the electrode (S610). In this case, the initial state of the cholesteric liquid crystal may be a focal-conic state having a transmittance of a predetermined value or more.

Then, an image is displayed according to the application of the voltage or a back background of the display device is provided (S620).

The initial state of the cholesteric liquid crystal is determined by firstly arranging the cholesteric liquid crystal by the polymer network formed by irradiating ultraviolet rays to the liquid crystal layer, and then applying the cholesteric liquid crystal to the cholesteric liquid crystal Can be set according to the applied voltage.

The substrate includes a first substrate and a second substrate opposed to the first substrate. The electrode includes a first electrode provided on one surface of the first substrate facing the second substrate and a second electrode provided on the second substrate facing the first substrate, And a second electrode provided on one side of the substrate, wherein the liquid crystal layer can be disposed between the first substrate and the second substrate.

Meanwhile, in operation S610, the voltage may be applied to the cholesteric liquid crystal in the initial state through the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode.

In this case, the cholesteric liquid crystal in the initial state is switched to the planar state when the first voltage is applied through the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode, and the plurality of electrodes And when the second voltage is applied through the plurality of electrodes of the second electrode, it may be converted into a homeotropic state.

Various embodiments of the present disclosure may be implemented in software, including instructions stored on machine-readable storage media readable by a machine (e.g., a computer) And may include an electronic device (e.g., remote control device 100, electronic device 200) in accordance with the disclosed embodiments, which is capable of operating in accordance with the called instruction. The processor may perform the functions corresponding to the instructions, either directly or under the control of the processor, using other components. The instructions may include code generated or executed by the compiler or interpreter. A readable storage medium may be provided in the form of a non-transitory storage medium, where 'non-transient' No distinction that does not include only the data mean that real (tangible) is permanently or temporarily stored in a storage medium.

According to a temporal example, the method according to various embodiments disclosed herein may be provided in a computer program product. A computer program product can be traded between a seller and a buyer as a product. A computer program product may be distributed in the form of a machine readable storage medium (eg, compact disc read only memory (CD-ROM)) or distributed online through an application store (eg PlayStore ™). In the case of on-line distribution, at least a portion of the computer program product may be temporarily stored, or temporarily created, on a storage medium such as a manufacturer's server, a server of an application store, or a memory of a relay server.

Each of the components (e.g., modules or programs) according to various embodiments may be comprised of a single entity or a plurality of entities, and some subcomponents of the aforementioned subcomponents may be omitted, or other subcomponents may be various May be further included in the embodiment. Alternatively or additionally, some components (e.g., modules or programs) may be integrated into a single entity to perform the same or similar functions performed by each respective component prior to integration. Operations performed by a module, program, or other component, in accordance with various embodiments, may be performed sequentially, in parallel, repetitively, or heuristically, or at least some operations may be performed in a different order, .

Claims

In the display device,

A liquid crystal layer including a cholesteric liquid crystal; And

And a substrate provided with an electrode for applying a voltage to the cholesteric liquid crystal,

Wherein the initial state of the cholesteric liquid crystal is a focal conic state having a transmittance of a predetermined value or more.
The method according to claim 1,

Wherein the liquid crystal layer further comprises a monomer,

The initial state of the cholesteric liquid crystal,

Wherein the cholesteric liquid crystal is arranged according to a voltage applied to the cholesteric liquid crystal after the cholesteric liquid crystal is primarily arranged by a polymer network formed by irradiating the liquid crystal layer with ultraviolet light.
The method according to claim 1,

Wherein the substrate includes a first substrate and a second substrate opposed to the first substrate,

The electrode includes a first electrode provided on one surface of the first substrate facing the second substrate and a second electrode provided on a surface of the second substrate facing the first substrate,

And the liquid crystal layer is disposed between the first substrate and the second substrate.
The method of claim 3,

And a panel driving unit for applying a voltage to the cholesteric liquid crystal in the initial state through a plurality of electrodes of the first electrode and a plurality of electrodes of the second electrode.
5. The method of claim 4,

The cholesteric liquid crystal in the initial state,

Wherein when the first voltage is applied through the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode, the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode To a homeotropic state when a second voltage is applied thereto.
A method of controlling a display device,

Applying a voltage to the cholesteric liquid crystal through a substrate provided with an electrode; And

Displaying an image according to the application of the voltage or providing a back background of the display device,

Wherein the initial state of the cholesteric liquid crystal is a focal conic state having a transmittance equal to or greater than a predetermined value.
The method according to claim 6,

Wherein the liquid crystal layer further comprises a monomer,

The initial state of the cholesteric liquid crystal,

Wherein the cholesteric liquid crystal is primarily arranged by a polymer network formed by irradiating the liquid crystal layer with ultraviolet light, and is set according to a voltage applied to the cholesteric liquid crystal.
The method according to claim 6,

Wherein the substrate includes a first substrate and a second substrate opposed to the first substrate,

The electrode includes a first electrode provided on one surface of the first substrate facing the second substrate and a second electrode provided on a surface of the second substrate facing the first substrate,

Wherein the liquid crystal layer is disposed between the first substrate and the second substrate.
9. The method of claim 8,

Wherein applying the voltage comprises:

Wherein the voltage is applied to the cholesteric liquid crystal in the initial state through the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode.
10. The method of claim 9,

The cholesteric liquid crystal in the initial state,

Wherein when the first voltage is applied through the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode, the plurality of electrodes of the first electrode and the plurality of electrodes of the second electrode To a homeotropic state when a second voltage is applied thereto.
A method of manufacturing a display device,

Providing a first substrate on which a plurality of electrodes are patterned;

Coating a liquid crystal layer comprising a cholesteric liquid crystal and a monomer on the first substrate;

Forming a second substrate on which a plurality of electrodes are patterned, on the liquid crystal layer;

Irradiating the liquid crystal layer with ultraviolet light; And

And applying a predetermined voltage to the liquid crystal layer irradiated with ultraviolet light to set an initial state of the cholesteric liquid crystal,

Wherein the initial state of the cholesteric liquid crystal is a focal conic state having a transmittance equal to or greater than a predetermined value.
12. The method of claim 11,

Wherein applying the voltage comprises:

Wherein the predetermined voltage is applied to the cholesteric liquid crystal in order to convert the cholesteric liquid crystal turned into a planar state according to the irradiation of the ultraviolet ray into a focal conic state having a transmittance of a predetermined value or more.