KR20160080070A - Liquid crystal lens film structure, method for the liquid crystal lens film structure and image display device comprising the same - Google Patents

Abstract

The present invention relates to a liquid crystal lens structure, a manufacturing method for a liquid crystal lens, and an image display device including the same. Specifically, The liquid crystal lens structure includes: first substrate; a second substrate facing the first substrate; an adhesive layer on the second substrate; and a liquid lens film between the first substrate and the adhesive layer. The liquid crystal lens film includes: a resin unit having multiple concave units: and a liquid crystal unit having liquid crystal molecules in the multiple concave units. The adhesive layer is in contact with the liquid crystal lens film or includes the liquid crystal lens film between the adhesive layer and the second substrate. The first substrate is in contact with the liquid crystal lens film, and the second substrate faces the first substrate. The adhesive layer is located on one side of the first substrate facing the second substrate. The liquid crystal lens film includes: the resin unit having multiple convex units; and the liquid crystal unit having the liquid crystal molecules on the outside of the multiple convex units. The adhesive layer is in contact with the liquid crystal lens film. Therefore, the liquid crystal lens structure has an improved adhesive property and an improved liquid crystal orientation property.

Description

TECHNICAL FIELD [0001] The present invention relates to a liquid crystal lens structure, a method of manufacturing a liquid crystal lens structure, and an image display device using the same. BACKGROUND ART [0002]

The present invention relates to a liquid crystal lens structure, a method for manufacturing the liquid crystal lens structure, and a video display device including the same. More particularly, the present invention relates to a liquid crystal lens structure having improved adhesiveness and liquid crystal orientation, a method of manufacturing the liquid crystal lens structure, .

A stereoscopic iamge display is a device that gives different images to viewers' left and right eyes, so that viewers can feel the sense of distance and stereoscopic effect. Respectively.

Since the glasses-based stereoscopic image display device is inconvenient for wearing glasses for viewing 3D images, the non-stereoscopic stereoscopic image display device is more preferred in recent years.

The stereoscopic image display apparatus of the non-eyeglass system can be largely divided into a system using a parallax barrier and a system using a liquid crystal lens array. Conventionally, studies on a method using a parallax barrier have been actively conducted. However, in this method, resolution and brightness are drastically reduced as the horizontal resolution is reduced by half and the number of viewpoints is increased in 3D implementation. Therefore, in recent years, much attention has been focused on the development of a non-eyeglass stereoscopic image display device using a liquid crystal lens array.

Conventionally, the liquid crystal lens array used in the non-eyeglass stereoscopic image display apparatus is mainly composed of glass substrates as the upper and lower substrates. However, the weight and thickness of the glass substrate are difficult to reduce in weight and thickness, .

Thus, a liquid crystal lens array using a flexible substrate instead of a glass substrate has been developed. FIG. 1 shows a structure of a liquid crystal lens array used in a conventional spectacle-less stereoscopic image display apparatus.

As shown in FIG. 1, the liquid crystal lens array includes a first substrate and a second substrate having a transparent electrode layer formed on a facing surface, and a liquid crystal lens film is interposed between the first substrate and the second substrate. An alignment layer for liquid crystal alignment of the adhesive layer and the liquid crystal lens film is disposed between the second substrate and the liquid crystal lens film.

The liquid crystal lens film includes a lens portion and a non-lens portion in the form of a lenticular lens. The liquid crystal is oriented in a certain direction by the alignment layer, and when voltage is applied to the transparent electrode layer, the liquid crystal lens is rearranged in a specific direction. The refractive index of the lens unit changes according to the alignment direction of the liquid crystal, and the direction of the light projected by the display device changes.

2 is a view schematically showing a method of displaying two-dimensional and three-dimensional images in a non-eyeglass system using a conventional liquid crystal lens array. Referring to FIG. 2, when an electric field is not applied to the liquid crystal lens film, the lens portion has a refractive index equal to the refractive index of the liquid crystal, and the non-lens portion has the refractive index equal to the refractive index of the liquid crystal. Since the refractive indexes of the lens part and the non-lens part are different from each other, light passing through the liquid crystal lens film is refracted at the interface between the lens part and the non-lens part, and parallax is generated to realize a three-dimensional image. On the other hand, when an electric field is applied to the liquid crystal lens film, the lens portion has the same refractive index as the liquid refractive index of the liquid crystal, and the refractive index difference between the lens portion and the non-lens portion is lost. Therefore, light passing through the liquid crystal lens film passes through the liquid crystal lens film without being refracted, thereby realizing a two-dimensional image. As described above, a three-dimensional image display apparatus of a non-eyeglass type in which a two-dimensional image and a three-dimensional image are selectively implemented using a liquid crystal lens array can be implemented.

However, the liquid crystal lens arrays developed so far have a problem in that the adhesion between the films is low, so that peeling easily occurs, and defects such as spreading of the liquid crystal due to the pressure applied at the time of adhering to the display panel occur. In addition, when a liquid crystal lens array is implemented using a flexible substrate (e.g., a film), since the Tg value of the film substrate is low, curling occurs in the film during the high temperature polyimide process for aligning the liquid crystal, However, liquid crystals which are not aligned can not express a desired refractive index value by an electric field. Figs. 3 to 5B are photographs showing problems involved in the liquid crystal lens array structure including the conventional flexible substrate.

In addition, in the conventional liquid crystal lens array, there is a problem that the alignment property of the liquid crystal is deteriorated due to the adhesive component of the adhesive layer and the image quality characteristic is deteriorated. On the second substrate, an adhesive layer having an insular property is formed, There is a problem that the driving voltage required for driving the driving motor is high.

An object of the present invention is to provide a liquid crystal lens structure having improved adhesiveness and liquid crystal orientation and an image display device including the same.

A liquid crystal lens structure according to an embodiment of the present invention includes a first substrate, a second substrate facing the first substrate, an adhesive layer on the second substrate, a resin portion having a plurality of concave portions between the first substrate and the adhesive layer, And a liquid crystal lens film including a liquid crystal portion having liquid crystal molecules inside the concave portion and in contact with the adhesive layer.

And a connecting portion between adjacent recesses of the plurality of recesses can contact the adhesive layer. Further, the adhesive layer may further include an adhesive capsule, wherein the adhesive capsule is dispersed in the adhesive layer.

A liquid crystal lens structure according to another embodiment of the present invention includes a first substrate, a second substrate facing the first substrate, an adhesive layer located on one surface of the first substrate facing the second substrate, a plurality of And a liquid crystal lens film including a liquid crystal portion having liquid crystal molecules outside a plurality of convex portions and in contact with the adhesive layer.

The plurality of convex portions may have a shape of a quadratic function graph, and the adhesive layer may contact an area corresponding to a vertex of the quadratic function graph. The adhesive layer may further include an adhesive capsule, .

The image display apparatus of the present invention includes the above-described liquid crystal lens structure of the present invention described above, and a display panel below the liquid crystal lens structure.

In the liquid crystal lens structure of the present invention, electrodes are formed on the first substrate and the second substrate, a resin portion having a plurality of concave portions is formed on the first substrate, or a resin portion having a plurality of convex portions is formed on the second substrate After the surface of the resin part is rubbed in one direction and an adhesive layer is formed on the first or second substrate, liquid crystal molecules are filled in a plurality of recesses or a large number of convex parts to form a liquid crystal part, 1 and the second substrate.

The liquid crystal lens structure of the present invention has improved adhesion and liquid crystal orientation.

The liquid crystal lens structure of the present invention can improve the adhesive force between the upper and lower substrates even when the flexible substrate is applied, thereby preventing the defective phenomenon due to the liquid crystal aggregation or the sagging phenomenon and orienting the liquid crystal without forming a separate liquid crystal alignment film.

The liquid crystal lens structure of the present invention can prevent the phenomenon of lens breakdown and ensure the process stability.

In addition, since the liquid crystal alignment characteristic is equal to or higher than that of the conventional liquid crystal alignment film, the image quality deterioration due to the application of the flexible substrate can be prevented.

Further, since the flexible substrate of the liquid crystal lens structure of the present invention can be applied, it is possible to manufacture the liquid crystal lens structure at low cost, and it is possible to make it light and thin.

In addition, when a shell made of a conductive material is formed on the surface of the adhesive capsule, the adhesive is broken and the conductive material is dispersed in the adhesive layer. As a result, the adhesive layer becomes conductive and the driving voltage is lowered. A vertical electric field can be realized in the liquid crystal lens film without forming an electrode.

The manufacturing method of the liquid crystal lens structure of the present invention can ensure simplification and stability of the process.

FIG. 1 is a view schematically showing a structure of a liquid crystal lens array used in a conventional spectacle-free stereoscopic image display apparatus.
2 is a view schematically showing a method of displaying two-dimensional and three-dimensional images in a non-eyeglass system using a conventional liquid crystal lens array.
FIG. 3 is a photograph showing a curl formed on a liquid crystal lens structure including a conventional film.
FIG. 4A is a photograph of a liquid crystal alignment characteristic when a polyimide high-temperature process is performed, and FIG. 4B is a photograph of a case where a liquid crystal alignment defect occurs because a polyimide high-temperature process is not performed.
FIG. 5A is a photograph of a state in which upper and lower plates are bent when a liquid crystal lens structure including a conventional film is bended, and FIG. 5B is a photograph of a state in which liquid crystals are gathered in a conventional liquid crystal lens structure.
FIG. 6A is a schematic cross-sectional view of an image display apparatus including the liquid crystal lens structure according to the first embodiment of the present invention, FIG. 6B is a schematic plan view of the liquid crystal lens structure according to the first embodiment, Fig. 8 is a photograph of a liquid crystal lens structure according to an example
7 is a view showing a case where the liquid crystal lens structure according to the first embodiment of the present invention is bent.
8 is a plan view for explaining the alignment characteristics of the liquid crystal lens structure according to the first embodiment of the present invention.
FIG. 9A is a schematic view illustrating a process of providing an adhesive layer including an adhesive capsule and a conductive shell to the liquid crystal lens structure according to the first embodiment of the present invention, and FIG. 9B is a photograph of the adhesive layer according to the present invention.
10 is a schematic cross-sectional view of a liquid crystal lens structure according to a second embodiment of the present invention.
11 is a view for explaining a concave portion of a liquid crystal lens structure according to a second embodiment of the present invention.
FIG. 12A is a schematic cross-sectional view of an image display apparatus including a liquid crystal lens structure according to a third embodiment of the present invention, and FIG. 12B is a photograph of the liquid crystal lens structure according to the third embodiment.
13 is a schematic view illustrating a process of providing an adhesive layer including an adhesive capsule and a conductive shell on a liquid crystal lens structure according to a third embodiment of the present invention.
14 is a schematic cross-sectional view of a liquid crystal lens structure according to a fourth embodiment of the present invention.
15 is a photograph of a sample for measuring the shearing force of the liquid crystal lens structure according to the present invention.
16 is a photograph of a shearing force measuring mechanism.

Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. However, the following drawings and embodiments are merely examples for allowing a person skilled in the art to sufficiently convey the spirit of the present invention, and the present invention is not limited by the following drawings and embodiments.

The shapes, sizes, ratios, angles, numbers and the like disclosed in the following drawings are exemplary and the present invention is not limited thereto. Like reference numerals refer to like elements throughout the specification. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In the case where the word 'includes', 'having', 'done', etc. are used in this specification, other parts can be added unless '~ only' is used. Unless the context clearly dictates otherwise, including the plural unless the context clearly dictates otherwise.

In interpreting the constituent elements, it is construed to include the error range even if there is no separate description.

In the case of a description of the positional relationship, for example, if the positional relationship between two parts is described as 'on', 'on top', 'under', and 'next to' Or " direct " is not used, one or more other portions may be located between the two portions.

In the case of a description of a temporal relationship, for example, if a temporal posterior relationship is described by 'after', 'after', 'after', 'before', etc., 'Is not used and is not contiguous.

The first, second, etc. are used to describe various components, but these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical spirit of the present invention.

It is to be understood that each characteristic portion of the various embodiments of the present invention may be partially or wholly combined or combinable with each other and technically various interlocking and driving are possible and that each implementation may be feasible independently of each other, It can be done together.

Liquid crystal lens structure and manufacturing method thereof

A liquid crystal lens structure according to an embodiment of the present invention includes a first substrate, a second substrate facing the first substrate, an adhesive layer on the second substrate, and a liquid crystal lens film between the first substrate and the adhesive layer, Wherein the liquid crystal lens film includes a resin portion having a plurality of concave portions and a liquid crystal portion having liquid crystal molecules inside the plurality of concave portions, the adhesive layer being in contact with the liquid crystal lens film.

FIG. 6A is a schematic cross-sectional view of an image display apparatus including the liquid crystal lens structure according to the first embodiment of the present invention, FIG. 6B is a schematic plan view of the liquid crystal lens structure according to the first embodiment, 1 is a photograph of a liquid crystal lens structure according to an example.

The first substrate 140 according to the present invention is for applying an electric field to the liquid crystal lens film 160 and is disposed on the liquid crystal lens film 160.

The first substrate 140 may be a flexible material such as a film or the like. For example, the first base film 110 may be made of polyethylene terephthalate, polycarbonate, polyimide, polyamide, poly Urethane, polymethyl methacrylate, polyvinyl alcohol, acrylonitrile-butadiene-styrene resin, and the like.

In addition, the first substrate 140 may further include a first electrode layer 142 by depositing a transparent conductive material on the entire surface thereof.

Although not shown, the first electrode layer 142 may include a plurality of first electrodes spaced from each other. Or the first electrode layer 142 may include a first layer including a plurality of first electrodes spaced from each other, a second layer formed of an insulating material below the first layer, and a plurality of spaced- And a third layer including a second electrode. In this case, the plurality of first electrodes may correspond to the spacing intervals of the plurality of second electrodes, and the plurality of second electrodes may correspond to the spacing intervals of the plurality of first electrodes, The electrodes can be arranged alternately with each other.

Next, a transparent organic resin material, for example, acrylic, is coated on the first substrate 140 on which the first electrode layer 142 is formed to a predetermined thickness, and then a resin portion having a concave portion through an imprinting roller 186 (164).

Then, a rubbing roll is applied to the resin portion 164 to perform the alignment treatment. At this time, the rubbing roller 194 is formed in a cylindrical shape including a rubbing cloth on the outer surface and rotates along the rotating direction, whereby the surface of the concave portion is rubbed by the rubbing roller 194, and the orientation that forms a microgroove The resin portion 164 having the concave portion that is subjected to the alignment treatment is formed. At this time, a plurality of concave portions are formed, and a pointed portion 162 is provided between the adjacent concave portions. That is, the connecting portion between adjacent concave portions of the concave portions may be in contact with the adhesive layer 168.

Finally, the liquid crystal molecules 165 may be filled in the concave portion to complete the first substrate 140.

The second substrate 150 according to the present invention is for supporting the liquid crystal lens film 166 and should be made of a flexible material such as a film. For example, the second substrate 150 may be made of polyethylene terephthalate, polycarbonate, , A polyamide, a polyurethane, a polymethyl methacrylate, a polyvinyl alcohol, an acrylonitrile-butadiene-styrene resin, or the like.

In addition, the second substrate 150 may further include a second electrode layer 152 by depositing a transparent conductive material on the entire surface thereof.

.

Next, an adhesive layer 168, which can be oriented to the upper portion of the second electrode layer 152, is attached using a roller. Here, the roller may be a laminate roller.

The adhesive layer 168 is used to attach the liquid crystal lens film 166 and the second substrate 150 to the liquid crystal lens film 166. The adhesive layer 168 is formed on the second substrate 150, do.

Then, a rubbing roll 184 is applied to the adhesive layer 168 to perform alignment treatment. At this time, the rubbing roller is formed into a cylindrical shape including a rubbing cloth on the outer surface and rotates along the rotating direction. The surface of the adhesive layer 168 is rubbed by the rubbing roller 184 and is subjected to an alignment treatment The adhesive layer 168 having the orientation characteristic is formed. The liquid crystal molecules of the liquid crystal lens film 160 can be arranged in a predetermined direction without the need of a separate alignment layer by the adhesive layer 168 as described above.

In addition, the process steps can be reduced through the adhesive layer 168 to reduce the process time and increase the productivity and efficiency of the process. More specifically, in order to form a general alignment film, a curing process including an orientation layer formation process, an alignment process process, a preliminary curing process and a final curing process must be performed through a coating method. However, in the present invention, there is no need to separately form an alignment film, and therefore, the formation process and the curing process necessary for forming an alignment film can be omitted by using the adhesive layer 168. [

8 is a plan view for explaining the alignment characteristics of the liquid crystal lens structure of the liquid crystal lens structure according to the first embodiment; Fig. 8 is a plan view for explaining the alignment characteristics of the liquid crystal lens structure of the liquid crystal lens structure according to the first embodiment .

The first substrate 140 manufactured by the first substrate manufacturing process and the second substrate 150 manufactured by the second substrate manufacturing process are joined together by the first and second rollers, respectively. The first substrate 140 and the second substrate 150 are aligned so as to face each other and the first and second rollers 140 and 150 are disposed on the outer surfaces of the first substrate 140 and the second substrate 150, . The first substrate 140 and the second substrate 150, which are positioned between the first substrate 140 and the second substrate 150, are adhered to each other by the pressure applied by the first and second rollers and the heat of 100 ° C or less.

At this time, the adhesive layer 168 on the second substrate 150 serves as a seal. More specifically, the adhesive layer 168 adhered to the entire surface of the first substrate 140 has adhesiveness The resin portion 164 on the second substrate 150 and more precisely the apex portions 162 are filled in the adhesive layer 168 by the pressure by the first and second rollers.

As described above, the cusp portion 162 between adjacent concave portions is embedded in the adhesive layer 168, so that the inner surface between the first substrate 140 and the second substrate 150 is also cemented. This makes it possible to completely eliminate the lifting phenomenon that is partially excited when the first substrate 140 and the second substrate 150 are joined together.

If the first substrate 140 and the second substrate 150 are bonded together so that the peak portion 162 contacts only the surface of the adhesive layer 168, the liquid crystal lens structure is subjected to external force A gap between the liquid crystal lens film 160 and the adhesive layer 168 may spread and liquid crystal molecules may leak.

However, in the present invention, adhesion is ensured between the liquid crystal lens film 160 and the adhesive layer 168 by adhering the pointed portions 162 so as to be embedded in the adhesive layer 168, and the liquid crystal lens structure has an external force Banding) does not cause a lift-up or widening phenomenon. Accordingly, as the adhesive force between the upper and lower substrates is improved, it is possible to prevent defective phenomena due to liquid crystal aggregation or leaning.

The alignment characteristics of such a liquid crystal lens structure will be described with reference to Fig. Here, the orthogonal polarizer 180 is applied to check whether the liquid crystal molecules of the liquid crystal lens structure according to the present invention are arranged in parallel along the axial direction.

8, when observing the liquid crystal lens structure between the orthogonal polarizers 180, when the alignment direction of the liquid crystal molecules is shifted by 45 degrees from the transmission axis or the absorption axis direction of the orthogonal polarizer 180, And when the arrangement direction of the liquid crystal molecules is parallel to the transmission axis or the absorption axis direction of the orthogonal polarizer 180, uniform black and white are exhibited. Thus, the alignment characteristics of the liquid crystal lens structure can be confirmed.

In addition, the liquid crystal lens structure according to the present invention can use a film having low heat resistance as a base substrate. Since the liquid crystal lens structure according to the present invention does not need to form a separate alignment film, it can be cured at a low temperature of 100 占 폚 or less, so there is no need to apply a high heat-resistant film having high heat resistance. Generally, the alignment layer is formed by applying a polyimide material and applying heat at a temperature of 200 ° C. or higher. In the present invention, a separate alignment film is not formed by applying the adhesive layer 168, It is possible to apply a low heat resistant film. This makes it possible to manufacture a liquid crystal lens structure at a low cost because it is not necessary to use a high heat resistant film which is less expensive than expensive glass but is relatively expensive.

In addition, it is lightweight and thin, and has a liquid crystal orientation characteristic equal to or more than that of a conventional liquid crystal alignment film, so that image quality deterioration due to application of a flexible substrate can be prevented. In addition, the liquid crystal lens structure of the present invention can prevent the phenomenon of lens breakdown, and can secure process stability.

Although not shown in the drawing, a seal pattern may be formed at the edges of the first substrate 140 or the second substrate 150. Accordingly, the edges can be bonded by the seal pattern, and the central portion of the inside of the edge can be bonded by the adhesive layer 168. [

According to one embodiment of the present invention, the adhesive layer 168 may be formed of at least one selected from the group consisting of an epoxy compound, an acrylate compound, a phenoxamine compound, and a thiol compound. In this case, 168 have thermosetting or photo-curable properties.

If necessary, the adhesive layer 168 may include at least one selected from the group consisting of a transparent conductive material and silica. In this case, adhesiveness and conductivity of the film may be significantly improved.

Preferably, the adhesive layer 168 may further comprise a matrix resin and an adhesive capsule dispersed in the matrix resin. At this time, the adhesive capsule further strengthens the adhesive force between the second substrate 150 and the liquid crystal lens film 160.

In order to impart liquid crystal alignability, the adhesive layer 168 is preferably formed of a material that can be oriented in one direction by rubbing or the like. In this case, there is an advantage that it is not necessary to form a separate alignment film such as a polyimide film.

On the other hand, the adhesive capsule is broken by pressure to develop an adhesive force. More specifically, the adhesive capsule is broken by the pressure applied for lamination with the display panel, and the adhesive component is discharged to exhibit an adhesive force.

As described above, the liquid crystal lens film 160 according to the first embodiment has a peak portion 162, and the peak portion 162 is subjected to the greatest pressure during lamination. Thus, during lamination, the adhesive capsules are mainly broken along the point 162, and the adhesive capsules in the center of the lens are hardly broken. As a result, the adhesive component is concentrated at the apex portion 162 between the lenses, and the adhesive components are encapsulated at the center portion of the lens. As described above, in the case of the adhesive layer 168 according to the present invention, since the adhesive component is not discharged to the central portion of the lens in which the liquid crystal is oriented, there is no problem that the orientation property of the liquid crystal is lowered due to the adhesive component.

Such an adhesive capsule can be produced by forming a monomer or resin having an adhesive component in the form of a bead. For example, although not limited thereto, the adhesive capsule may be prepared by reacting a monomer having an epoxy group with active hydrogen in the same equivalent amount to form a bead. The adhesive capsule thus prepared contains units derived from a monomer having an epoxy group. In this case, the monomer having an epoxy group may be an alicyclic epoxy monomer, more preferably a compound represented by the following formula (1).

[Chemical Formula 1]

In the above formula (1), R 2 may be hydrogen or a substituted or unsubstituted C 1-10 linear or branched alkylene.

It is preferable that the adhesive capsule is contained in an amount of 10% by weight to 40% by weight based on the total weight of the adhesive layer 168. If the content of the adhesive capsules is less than 10% by weight, it is difficult to secure a sufficient adhesive strength. If the content exceeds 40% by weight, haze may be generated by the adhesive capsules and the image quality may be deteriorated.

The adhesive capsule preferably has an average particle diameter of about 1 탆 to 10 탆. When the average particle diameter of the adhesive capsules is less than 1 탆, the particles are not crushed well, and when the average particle diameter exceeds 10 탆, the liquid crystal orientation may be lowered.

Meanwhile, the adhesive capsule may be formed of a single layer or a core-shell structure.

FIG. 9A is a schematic view illustrating a process of providing an adhesive layer including an adhesive capsule and a conductive shell to the liquid crystal lens structure according to the first embodiment of the present invention, and FIG. 9B is a photograph of the adhesive layer according to the present invention.

As shown in Fig. 9A, the adhesive capsule of the present invention can be made of a core-shell structure further comprising a shell containing a conductive material.

Since the adhesive layer 168 is formed to include a polymer, it is accompanied by insulating properties due to the characteristics of the material, and thus the driving voltage is increased. Accordingly, when the adhesive layer 168 of the present invention is formed of a core-shell structure further comprising a shell of a conductive material, the driving voltage can be lowered as conductivity is developed.

At this time, the core may be formed by reacting a monomer or resin including an adhesive component, for example, a monomer having an epoxy group, with active hydrogen in the same equivalent amount. In this case, the core comprises a unit derived from a monomer having an epoxy group. On the other hand, the monomer having an epoxy group may be an alicyclic epoxy monomer, more preferably a compound represented by the following formula (1).

[Chemical Formula 1]

In the above formula (1), R 2 may be hydrogen or a substituted or unsubstituted C 1-10 linear or branched alkylene.

Meanwhile, the shell may be formed by coating a conductive material such as nickel, copper, aluminum, or silver on the core by plating or the like. In the case of using the adhesive capsule including the shell including the conductive material as described above, since the adhesive layer 168 has conductivity, it is possible to prevent the liquid crystal from adhering to the liquid crystal without forming the electrode between the second substrate 150 and the liquid crystal lens film 160. [ Voltage can be applied.

In the case of using an adhesive capsule having a single layer structure, it is preferable to further include an electrode 152 between the second substrate 150 and the adhesive layer 168 to apply a voltage of the liquid crystal.

In the present invention, the liquid crystal lens film 160 is for providing a three-dimensional image by imparting a parallax to the light projected from the display panel. The liquid crystal lens film 160 is disposed above the adhesive layer 168 in contact with the adhesive layer 168, And a liquid crystal in which the alignment state varies. More specifically, the liquid crystal lens film 160 includes a resin portion 164 having a plurality of concave portions and a liquid portion 166 having liquid crystal molecules 165 in the plurality of concave portions. At this time, the liquid crystal molecules 165 are aligned in one direction by the adhesive layer 168, and are re-arranged in a specific arrangement when a voltage is applied.

Meanwhile, the resin part 164 is made of a material having the same refractive index as the liquid crystal molecule 165, and may be made of, for example, a polymer resin.

The shape of the concave portion of the liquid crystal lens film 160 may be a lenticular lens shape. However, the shape of the concave portion is not particularly limited as long as it does not deviate from the object of the present invention. For example, a semicircle, .

FIG. 10 is a schematic cross-sectional view of a liquid crystal lens structure according to a second embodiment of the present invention, and FIG. 11 is a view for explaining a concave portion of the liquid crystal lens structure according to the second embodiment of the present invention.

Here, the structure except for the liquid crystal lens film 260 and the adhesive layer 268 is the same as that of the liquid crystal lens structure of Figs. 6A to 6C, and thus a detailed description of the same constitution will be omitted.

As shown in FIG. 10, the liquid crystal lens structure includes a first and a second substrate 250 including a liquid crystal lens film 260 and spaced apart from each other. The first substrate 240 includes a first electrode layer 242 and a liquid crystal lens film 260 disposed on the first electrode layer 242. The second substrate 250 includes a second electrode layer 252, Lt; RTI ID = 0.0 > 268 < / RTI >

A first electrode layer 242 may be formed between the first substrate 240 and the liquid crystal lens film 260 and a second electrode layer 252 may be further formed between the second substrate 250 and the adhesive layer 268.

Here, the liquid crystal lens film 260 includes a plurality of recesses, a resin portion 264 including a plurality of horizontal portions 262 positioned between the plurality of recesses and connecting the recesses, And a liquid portion 266 including molecules 265.

In this case, each of the plurality of horizontal portions 262 has a first length L, which is a structure for increasing a contact area with the adhesive layer 268 by separating a plurality of recesses from each other as shown in FIG. 11 .

In more detail, in the first embodiment of the present invention, the cusp portion between adjacent concave portions is embedded in the liquid crystal lens film so that the inner side between the first substrate and the second substrate is cemented to improve the cementation characteristics. However, In the second embodiment according to the present invention, the horizontal part 262 is provided between the concave parts adjacent to each other and the horizontal part 262 is directly bonded to the adhesive layer 268, The adhesion between the substrate 250 and the inner surface of the substrate 250 is improved to improve the adhesion characteristics.

In this case, the first length L of each horizontal portion 262 is preferably determined in consideration of the contact area of the adhesive layer 268 and the size of the liquid portion 266. That is, as the first length L becomes longer, the contact surface area with the adhesive layer 268 increases and the adhesion between the first substrate 240 and the second substrate 250 improves. However, the size of the liquid portion 266 Is small and liquid crystal molecules are filled to a small extent and defects such as crosstalk may occur. Therefore, it is preferable that the length is such that a defective light source such as crosstalk is not generated.

Meanwhile, since the plurality of horizontal portions 262 are provided between the plurality of recesses, the thickness of the adhesive layer 268 can be reduced. In the case of the first embodiment of the present invention, the liquid crystal lens film is formed to have a constant thickness so that the apexes between adjacent concave portions are embedded in the liquid crystal lens film.

However, in the case of the second embodiment of the present invention, a plurality of horizontal portions 262 are respectively provided between the plurality of recesses, and as each horizontal portion 262 is directly bonded to the surface of the adhesive layer 268, (H) which is thinner than the thickness of the first embodiment. Thus, the adhesive layer 268 can be formed to have a thickness (H) that is thinner than the thickness of the first embodiment, and the voltage drop phenomenon of the second electrode layer 252 can be prevented.

Further, through this, the concave portion has the fifth thickness H5, and the entire sixth thickness of the liquid crystal lens film 260 can be reduced. This can reduce the thickness of the liquid crystal lens structure and reduce the number of liquid crystal molecules contained in the liquid portion 266 as the fifth thickness H5 of the concave portion decreases. Accordingly, a lighter and slim image display device can be realized, and the cost of parts can be reduced and the entire manufacturing cost can be reduced.

Meanwhile, the plurality of horizontal portions 262 serve to improve cross-talk. That is, in the present invention, a plurality of horizontal portions 262 are used to connect a plurality of concave portions to each other to prevent a cusp between adjacent concave portions, thereby preventing crosstalk that may be caused by the cusp portion . Thus, the crosstalk is prevented, and a clear three-dimensional stereoscopic image can be recognized.

A liquid crystal lens structure according to another embodiment of the present invention includes a first substrate, a second substrate facing the first substrate, an adhesive layer located on one surface of the first substrate facing the second substrate, Wherein the liquid crystal lens film comprises a resin portion having a plurality of convex portions and a liquid crystal portion having liquid crystal molecules outside the plurality of convex portions, Touch.

That is, in the case of the liquid crystal lens structures of the first and second embodiments, liquid crystal molecules are provided in a plurality of concave portions. According to this embodiment, the resin portion has convex portions, and liquid crystal molecules are provided outside the convex portions.

FIG. 12A is a schematic cross-sectional view of an image display apparatus including a liquid crystal lens structure according to a third embodiment of the present invention, and FIG. 12B is a photograph of the liquid crystal lens structure according to the third embodiment. Referring to this, the liquid crystal molecules 165 of the third embodiment are provided outside a plurality of convex portions, and a peak portion 162 is provided between adjacent convex portions.

14 is a schematic cross-sectional view of the liquid crystal lens structure according to the fourth embodiment of the present invention. Referring to FIG. 14, the liquid crystal molecules 265 of the fourth embodiment are provided outside a plurality of convex portions, And the horizontal portion 262 is directly adhered to the adhesive layer 268. As shown in FIG.

Here, except for the position of the adhesive layer and the position in which the liquid crystal molecules are contained, the liquid crystal lens structure of the first embodiment is the same as the liquid crystal lens structure of the first embodiment, and the liquid crystal lens structure of the second embodiment is the same And a detailed description of the effect will be omitted.

Video display device

The image display apparatus 110 of the present invention includes a display panel 120 for displaying an image and a liquid crystal lens structure 130 disposed on the display panel 120 (see FIGS. 6A and 12A).

Here, the display panel 120 includes a plurality of left eye pixels PL and a plurality of right eye pixels PR. In the 2D mode, a plurality of left eye pixels PL and a plurality of right eye pixels PR form one image In the 3D mode, a plurality of left eye pixels PL display a left eye image and a plurality of right eye pixels PR display a right eye image.

The display panel 120 generates a video signal, and display panels well known in the art can be used without limitation and are not particularly limited as long as they do not depart from the object of the present invention. The display panel 120 may be, for example, a liquid crystal display panel, an organic electroluminescence panel, or a plasma display panel. Here, the liquid crystal display panel and the organic electroluminescence panel may be of any type of liquid crystal display panel and organic electroluminescence panel, which are known in the art, and are not particularly limited.

According to an embodiment of the present invention, the display panel 120 may be a liquid crystal display panel including a first substrate, a second substrate, and a liquid crystal layer interposed between the first substrate and the second substrate. In this case, a thin film transistor for applying a voltage to each pixel may be formed on the first substrate, and R (red), G (green), and B (blue) ) Color filter layer may be formed. The liquid crystal display panel may be a color filter on transistor (COT) liquid crystal display panel in which a thin film transistor and a color filter layer are both formed on a first substrate.

Further, an alignment film for aligning the liquid crystal may be included between the first substrate and the liquid crystal layer and / or between the second substrate and the liquid crystal layer.

Meanwhile, liquid crystal display panels of various modes such as IPS (In Plane Switching) mode or FFS (Fringe Field Switching) mode are widely used as the liquid crystal display panel in addition to TN (Twisted Nematic) mode and VA .

In the case of using the liquid crystal display panel as the display panel 120, a backlight unit for supplying light may be disposed under the liquid crystal display panel.

According to another embodiment of the present invention, the display panel 120 includes a first substrate, a first substrate, a first electrode, a second electrode, and an organic layer disposed between the first and second electrodes. And an organic electroluminescent display panel including an organic device including a light emitting layer. At this time, a thin film transistor for applying electricity to the organic device may be formed on the first substrate, and an encapsulating layer and / or an encapsulating substrate for protecting the organic device may be further formed on the organic device.

The image signal generated in the display panel 120 may be implemented as a two-dimensional image or a three-dimensional image depending on whether a voltage is applied to the liquid crystal lens film structure.

For example, when the image display apparatus 110 is driven in the 2D mode, the display panel 120 displays one image, and first and second voltages set to the same value are applied to the first electrode layer 142 and the second electrode layer 142, The liquid crystal lens structure 130 transmits a single image of the display panel 120 as it is, such as a simple glass plate, and as a result, the user views the 2D image .

When the image display apparatus 110 is driven in the 3D mode, the display panel 120 displays the left eye image and the right eye image, and first and second voltages, which are set to different values, The liquid crystal lens structure 130 operates as a lens to separate the left eye image and the right eye image of the display panel 120 and transmit them to different viewing zones , So that the user can view the 3D image.

Experimental Example  One

In order to confirm the adhesion and the process safety in the liquid crystal lens structure of the present invention, the shear force of the liquid crystal lens film was measured.

FIG. 15 is a photograph of a sample for measuring a shearing force of the liquid crystal lens structure according to the present invention, and FIG. 16 is a photograph of a shearing force measuring mechanism.

As shown in Fig. 15, the first substrate and the liquid crystal layer are arranged in the A region, the liquid crystal lens film and the second substrate are arranged in the B region, and the first substrate and the liquid crystal layer are disposed in the B region by using a shear force measuring instrument (model: AG- Shear force of the liquid crystal lens structure according to the examples (including the adhesive material and the conductive material inside the film) was measured and evaluated three times in succession.

division 1 time Episode 2 3rd time medium Shear force (kgf / in ² ) 26.06 24.94 25.22 25.41

Referring to Table 1, the liquid crystal lens structure of the present invention exhibited an average shear force of 25.41 kgf / in ² .

Experimental Example  2

The shear force of the liquid crystal lens structure according to the first embodiment (including the adhesive material and the conductive material inside the film) and the comparative example 1 (the upper and lower substrates of the liquid crystal lens structure were glass and the liquid crystal lens film was omitted) were measured. The shearing force evaluation method and measurement instrument are the same as those of Experimental Example 1, and the results are shown in Table 2 below.

division Example
Shear force (kgf / in ² ) Comparative Example 1 Shear force (kgf / in ² ) 1 time 27.01 3.1 Episode 2 25.5 2.8 3rd time 26.3 4.1 medium 26.27 3.3

Referring to Table 2, the liquid crystal lens structure of the present invention exhibited a shear force of 26.27 kgf / in ² on average and the comparative example showed an average shear force of 3.3 kgf / in ² , It was confirmed that the property was excellent.

Experimental Example  3

A current was applied to the electrode and the resin layer in the liquid crystal lens structure according to the first embodiment (including the adhesive material and the conductive material in the film) to measure a voltage applied when full white state was attained. In addition, a current was applied to the upper electrode and the lower electrode of Comparative Example 2 (a conventional liquid crystal lens array having the structure shown in FIG. 1) to measure a voltage applied when it became a full white state.

Table 3 shows the results.

division First Embodiment Comparative Example 2 The driving voltage (V) 10 17

Referring to Table 3, it can be seen that the driving voltage of the liquid crystal lens film structure according to the present invention is lower than the driving voltage of the conventional liquid crystal lens array.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

110: video display device 120: display panel
130, 230: liquid crystal lens structure 140, 240: first substrate
142, 242: first electrode layer 150, 250: second substrate
152, 252: second electrode layer 160, 260: liquid crystal lens film
164, 264: Resin part
165, 265: liquid crystal molecules 166, 266:
162: Point of attachment 168, 268:
180: orthogonal polarizer 184: rubbing roller
262:

Claims (18)

A first substrate;
A second substrate facing the first substrate;
An adhesive layer on the second substrate; And
And a liquid crystal lens film between the first substrate and the adhesive layer,
Wherein the liquid crystal lens film includes a resin portion having a plurality of concave portions and a liquid crystal portion having liquid crystal molecules inside the plurality of concave portions,
And the adhesive layer is in contact with the liquid crystal lens film.
The method according to claim 1,
And a connecting portion between adjacent concave portions of the plurality of concave portions is in contact with the adhesive layer.
The liquid crystal lens structure according to claim 1, wherein the adhesive layer further comprises an adhesive capsule.
4. The liquid crystal lens structure according to claim 3, wherein the adhesive capsules are dispersed in the adhesive layer and are composed of a single structure or a core-shell structure.
5. The liquid crystal lens structure according to claim 4, wherein the adhesive capsule further comprises a shell made of a conductive material.
The method according to claim 1,
Wherein an electrode layer is provided on at least one of the second substrate and the adhesive layer, and between the first substrate and the liquid crystal lens film.
A first substrate;
A second substrate facing the first substrate;
An adhesive layer disposed on one surface of the first substrate facing the second substrate; And
And a liquid crystal lens film between the adhesive layer and the second substrate,
Wherein the liquid crystal lens film includes a resin portion having a plurality of convex portions and a liquid crystal portion having liquid crystal molecules outside the plurality of convex portions,
And the adhesive layer is in contact with the liquid crystal lens film.
8. The method of claim 7,
Wherein the convex portion has a shape of a quadratic function graph, and the region corresponding to the vertex of the quadratic function graph and the adhesive layer are in contact with each other.
8. The liquid crystal lens structure according to claim 7, wherein the adhesive layer further comprises an adhesive capsule.
10. The liquid crystal lens structure according to claim 9, wherein the adhesive capsules are dispersed in the adhesive layer and are composed of a single structure or a core-shell structure.
11. The liquid crystal lens structure according to claim 10, wherein the adhesive capsule further comprises a shell made of a conductive material.
8. The method of claim 7,
Wherein an electrode layer is provided on at least one of the first substrate and the adhesive layer and between the second substrate and the liquid crystal lens film.
A liquid crystal lens structure according to any one of claims 1 to 12; And
And a display panel on a lower portion of the liquid crystal lens structure.
Forming an electrode on the first substrate and the second substrate;
Forming a resin portion having a plurality of concave portions on the first substrate or forming a resin portion having a plurality of convex portions on the second substrate;
Rubbing the surface of the resin part in one direction;
Forming an adhesive layer on any one of the first and second substrates;
Filling liquid crystal molecules in the plurality of recesses or the plurality of convex portions to form a liquid crystal portion; And
And bonding the first and second substrates together.
15. The method of claim 14,
Wherein the step of forming the adhesive layer further comprises a rubbing step of rubbing the surface of the adhesive layer through the rubbing roller.
15. The method of claim 14,
Wherein the rubbing direction of the resin portion and the rubbing direction of the adhesive layer are the same or orthogonal.
15. The method of claim 14,
Wherein the adhesive layer is formed to include at least one selected from the group consisting of an epoxy compound, an acrylate compound, a phenoxamine compound, and a thiol compound.
16. The method of claim 15,
Wherein the adhesive layer is formed by further including at least one selected from the group consisting of a transparent conductive material and silica.

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