KR102317711B1 - Filter for autostereoscopic display - Google Patents

Abstract

The present invention relates to a filter used in a glasses-free stereoscopic image display device capable of 2D/3D switching without glasses, wherein the filter for the glasses-free stereoscopic image display device includes a second electrode layer in which a sharp peak of a pattern layer includes a transparent conductive adhesive. It is possible to increase the adhesion between the upper and lower parts of the filter by penetrating and adhering to the filter. As a result, the filter for the glasses-free stereoscopic image display device can maintain the cell-gap, which means the thickness of the liquid crystal layer, at a constant value, and maintain the shape due to high durability against bending when manufactured using a flexible substrate Performance is excellent. In addition, the filter for the glasses-free stereoscopic image display device is commercially useful because it can reduce the amount of liquid crystal used without significantly changing the existing filter configuration.

Description

Filter for glasses-free stereoscopic image display {FILTER FOR AUTOSTEREOSCOPIC DISPLAY}

The present invention relates to a filter used in a glasses-free stereoscopic image display device capable of 2D/3D conversion without glasses, and more particularly, to a filter having excellent durability against bending while borrowing a lenticular lens method, and an autostereoscopic stereoscopic image including the same It relates to a video display device.

As the demand for a 3D stereoscopic image has increased over the past several years, various technologies for a device for displaying a 3D stereoscopic image have been developed. In the 3D stereoscopic image, different flat images are input to both eyes of the viewer, and the viewer feels a three-dimensional effect by fusion and recognizing them.

Until now, the image separation method through glasses has occupied most of the stereoscopic image display devices. have.

In the parallax barrier method, it is easy to switch between 2D/3D screens and the viewing distance can be adjusted. There is a trend towards shifting the center of gravity.

In particular, as high resolution of the display has recently emerged as an important issue, technology development for a liquid crystal lens method capable of 2D/3D conversion that has improved the resolution inhibition of the existing lenticular lens method is being actively conducted. The lenticular lens method using liquid crystal has good luminance and can provide both a 2D image and an autostereoscopic image without a resolution degradation depending on whether a voltage is applied or not.

A representative example of a 2D/3D switchable stereoscopic image display device using a liquid crystal lens is shown in FIGS. 4A and 4B . As shown in FIGS. 4A and 4B , display pixels differentiated for each viewpoint move straight forward depending on whether a voltage is applied to the liquid crystal layer to express a 2D flat image without resolution degradation, and it is also possible to project a stereoscopic image to both eyes by being refracted. For example, Korean Patent Application Laid-Open No. 2012-0074190 discloses a Fresnel lens type liquid crystal gradient index (GRIN) lens method.

Republic of Korea Patent Publication No. 2012-0074190

Despite the many advantages of the liquid crystal lens method, an appropriate focal length must be maintained in order to exhibit a sufficient lens effect, and the liquid crystal layer must have a thickness of at least several tens of μm. There were downsides to that. In addition, as the lenticular lens-shaped pattern layer is used, the area for bonding and fixing the pattern layer to the upper and lower electrode layers is quite narrow. There were downsides to maintenance.

As a result of research to solve this problem, the present inventors developed a technology that can reduce the amount of liquid crystal while increasing durability against bending by utilizing the peak portion of the pattern layer without significantly modifying the existing filter structure. did.

Accordingly, it is an object of the present invention to provide a filter for an autostereoscopic image display device capable of increasing durability against bending and reducing liquid crystal usage.

Another object of the present invention is to provide a glasses-free stereoscopic image display device including the filter having the improved structure.

According to one aspect of the present invention, (a) a first electrode layer; (b) a second electrode layer disposed in parallel under the first electrode layer; (c) a pattern layer disposed between the first electrode layer and the second electrode layer and having a pattern in which concave lenticular lenses are arranged on a lower surface; and (d) liquid crystal injected into the concave space of the pattern layer, wherein the second electrode layer includes a transparent conductive adhesive, and the sharp peak of the lenticular lens-shaped pattern is the There is provided a filter for a glasses-free stereoscopic image display device that penetrates and adheres to a second electrode layer.

According to another aspect of the present invention, (a) a first electrode layer; (b) a second electrode layer disposed in parallel under the first electrode layer; (c) a pattern layer disposed between the first electrode layer and the second electrode layer and having a pattern in which concave lenticular lenses are arranged on a lower surface; (d) liquid crystal injected into the concave space of the pattern layer; and (e) a plurality of stereoscopic pixels disposed under the second electrode layer, wherein the second electrode layer includes a transparent conductive adhesive, and a sharp peak portion of the lenticular lens-shaped pattern is the second electrode layer. There is provided a glasses-free stereoscopic image display device that penetrates and adheres to the second electrode layer.

In the filter for an autostereoscopic image display device according to the present invention, the sharp peak portion of the pattern layer penetrates and adheres to the second electrode layer including the transparent conductive adhesive, thereby increasing the adhesion between the upper and lower portions of the filter.

As a result, the filter for the glasses-free stereoscopic image display device can maintain the cell-gap, which means the thickness of the liquid crystal layer, at a constant value, and maintain the shape due to high durability against bending when manufactured using a flexible substrate Performance is excellent.

In addition, the filter for the glasses-free stereoscopic image display device is commercially useful because it can reduce the amount of liquid crystal used without significantly changing the existing filter configuration.

In addition, when disposing the display panel under the filter for an autostereoscopic image display device, when the width of the black matrix inserted between the three-dimensional pixels and the width of the peak penetrating into the second electrode layer are the same, the peak portion or the black It is possible to prevent deterioration of image quality due to the matrix.

1A is a cross-sectional view of a filter for an autostereoscopic image display device according to an example of the present invention.
1B is a cross-sectional view of an autostereoscopic image display device according to an example of the present invention.
2A and 2B show a configuration design of a filter for an autostereoscopic image display device according to Examples 1 and 2, respectively.
3 is a diagram illustrating a configuration design of a filter for an autostereoscopic image display device of Comparative Example 1. Referring to FIG.
4A and 4B show a 2D mode and a 3D mode, respectively, in a typical autostereoscopic image display device.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

In the accompanying drawings, the size or spacing may be exaggerated to help understanding, and the contents obvious to those of ordinary skill in the art may be omitted.

1A is a cross-sectional view of a filter for an autostereoscopic image display device according to an example of the present invention.

Referring to FIG. 1A , a filter 100 for an autostereoscopic image display device according to the present invention includes (a) a first electrode layer 110; (b) a second electrode layer 120 disposed in parallel under the first electrode layer 110; (c) a pattern layer 150 disposed between the first electrode layer 110 and the second electrode layer 120 and having a pattern in which concave lenticular lenses are arranged on a lower surface; and (d) a liquid crystal 160 injected into the concave space of the pattern layer 150, wherein the second electrode layer 120 includes a transparent conductive adhesive, and a sharp peak portion of the lenticular lens-shaped pattern ( 151) penetrates into and adheres to the second electrode layer 120 .

Hereinafter, each component will be described in more detail.

The first electrode layer and the second electrode layer serve to change the alignment of the liquid crystal by applying a voltage to the liquid crystal molecules.

The first electrode layer and the second electrode layer may be made of a transparent conductive material.

The material of the first electrode layer may include indium tin oxide (ITO), carbon nano tube (CNT), metal mesh, silver nanowire (Ag nanowire), and the like.

The second electrode layer may include a transparent and transparent conductive adhesive, for example, the second electrode layer may be made of a transparent conductive adhesive.

The transparent conductive adhesive may be a transparent conductive epoxy resin or indium tin oxide (ITO) nanopowder adhesive, but is not particularly limited.

The first electrode layer and the second electrode layer may be respectively formed on inner surfaces of the first and second substrates disposed parallel to each other.

The first substrate and the second substrate may be transparent plastic or glass substrates, and more specifically, transparent plastic.

Specific examples of the material of the first substrate and the second substrate include polyether sulfone (PES), polyacrylate (PAR), polyetherimide (PEI), polyethylene naphthalate (PEN). ), polyethyleneterephthalate (PET), polyphenylene sulfide (PPS), polyallylate, polyimide, polycarbonate (PC), cellulose triacetate cellulose, TAC), cellulose acetate propionate (CAP), and mixtures thereof.

Preferably, the first substrate and the second substrate may use polyethylene terephthalate, polycarbonate, cellulose triacetate or polyacrylate having optically isotropic properties.

In addition, the first substrate and the second substrate have excellent adhesion to the polymer resin included in the pattern layer, transmittance of light incident from the rear surface is 90% or more, and the smoothness of the surface is uniform, so that there is no deviation in luminance. it is better not to

The thickness of the first substrate and the second substrate may be 50 to 500 μm, 50 to 200 μm, or 80 to 125 μm.

The pattern layer is disposed between the first electrode layer and the second electrode layer to serve as a spacer forming a liquid crystal space.

The pattern layer has a pattern in which concave lenticular lenses are arranged on a lower surface, and thus has a sharp peak portion corresponding to a narrow valley between the lenticular lenses on the lower surface.

In a cross section in a direction perpendicular to the extending direction of the lenticular lenses (ie, a direction in which the lenticular lenses are arranged), each lenticular lens may have a semicircular shape.

In a cross section in a direction perpendicular to the extending direction of the lenticular lens, the radius of the lenticular lens shape is R, and the height of the sharp peak of the lenticular lens shape pattern penetrating into the second electrode layer is h. may be 10 to 50% of R.

As another specific example, h may be 10 to 30%, or 10 to 15% of R.

Here, the concave space of the pattern layer 150 may have a maximum height c corresponding to 30 to 70% of the R. As another specific example, the concave space of the pattern layer 150 may have a maximum height c corresponding to 50 to 70%, or 60 to 70% of the R.

The height of the lenticular lens may be 2-300 μm, 5-120 μm, or 20-80 μm, and thus the height of the lenticular lens layer may also be 2-300 μm, 5-120 μm, or 20-80 μm. .

The size of the lenticular lens may be a size commonly used depending on the resolution and pixel size of the display device, or the viewing distance, for example, may have a radius of about 0.01 to 10 mm, 0.05 to 8 mm, or 0.1 to 5 mm. .

The pattern layer is, for example, coated with a polymer resin on one surface of the second substrate, molded using a tool on which a predetermined pattern is formed, and then cured to form a lenticular lens having a concave shape.

The polymer resin used for the pattern layer may be a thermosetting resin or UV curable resin commonly used, for example, acrylic, urethane, epoxy, vinyl, polyester, polyamide resin, or mixtures thereof. Can be used.

Specifically, the polymer resin is a (meth) acrylate resin, an unsaturated polyester resin, a polyester (meth) acrylate resin, a silicone urethane (meth) acrylate resin, a silicone polyester (meth) acrylate resin, a fluorine urethane ( meth)acrylate resins and mixtures thereof.

More specifically, the binder resin may be an acrylic resin capable of implementing excellent coating properties, mechanical properties, adhesion, durability, and the like.

The acrylic resin is, for example, methyl methacryl, methacryl, ethyl acryl, butyl acryl, aryl acryl, hexyl acryl, isopropyl methacryl, benzyl acryl, vinyl acryl, 2-methoxyethyl acryl or styrene as a repeating unit It may be a homopolymer or a copolymer obtained by copolymerizing two or more of the above components.

The refractive index of the pattern layer may match any one of the extraordinary refractive index (ne) and the normal refractive index (no) of the liquid crystal.

The liquid crystal is injected into the concave space of the pattern layer to cause a change in refractive index according to the application of voltage.

Accordingly, the liquid crystal may have the same refractive index or a different refractive index from that of the pattern layer depending on whether a current is applied.

An alignment layer may be provided between the pattern layer and the liquid crystal and between the second electrode layer and the liquid crystal, and thus the liquid crystal may be surrounded by the alignment layer.

The alignment layer may be grooved in a predetermined direction so that the liquid crystal may be aligned in a predetermined direction depending on whether a voltage is applied.

Accordingly, the liquid crystal is aligned in a predetermined direction according to the application of a voltage, and the refractive index of the liquid crystal layer is changed so that the film for an autostereoscopic image display device of the present invention can be converted into a 2D mode and a 3D mode.

That is, the refractive index of the liquid crystal layer may change depending on the alignment state of the liquid crystal.

For example, when the film for an autostereoscopic image display device of the present invention operates in 2D mode, the refractive index of the lenticular lens layer matches the extraordinary refractive index (ne) or normal light refractive index (no) of the liquid crystal layer, so that the display Let the light incident from the panel pass through without being refracted.

On the other hand, when the film for an autostereoscopic image display device of the present invention operates in 3D mode, by changing the alignment state of the liquid crystal to change the refractive index of the liquid crystal layer, light incident from the display panel is refracted in the liquid crystal layer and stereoscopic implement the video.

The manufacturing method of the filter for the autostereoscopic image display device includes, for example, (1) forming a first electrode layer on a first substrate, coating a polymer resin on the first electrode layer, and concave on the surface of a lenticular lens manufacturing an upper plate by forming a pattern layer having a pattern in which they are arranged; (2) applying a transparent conductive adhesive on a second substrate to form a second electrode layer to prepare a lower plate; (3) bonding the upper plate and the lower plate so that the sharp peak of the pattern layer penetrates and adheres to the second electrode layer; and (4) injecting liquid crystal into the concave space of the pattern layer.

1B is a cross-sectional view of an autostereoscopic image display device according to an example of the present invention.

1A and 1B, the autostereoscopic image display device 10 according to the present invention includes (a) a first electrode layer 110; (b) a second electrode layer 120 disposed in parallel under the first electrode layer 110; (c) a pattern layer 150 disposed between the first electrode layer 110 and the second electrode layer 120 and having a pattern in which concave lenticular lenses are arranged on a lower surface; (d) the liquid crystal 160 injected into the concave space of the pattern layer 150; and (e) a plurality of three-dimensional pixels (210) disposed under the second electrode layer (120), wherein the second electrode layer (120) comprises a transparent conductive adhesive, and a sharp peak of the lenticular lens-shaped pattern. The part 151 penetrates and adheres to the second electrode layer 120 .

In the autostereoscopic image display device 10, the first substrate 130, the second substrate 140, the first electrode layer 110, the second electrode layer 120, the pattern layer 150 constituting the filter, The peak portion 151 and the liquid crystal 160 may have the same configuration as described above in the filter for an autostereoscopic image display device.

The autostereoscopic image display device 10 further includes a black matrix 220 inserted between the three-dimensional pixels 210 , and the black matrix 220 includes a sharp peak portion 151 of the lenticular lens-shaped pattern. ) may be disposed at a position corresponding to the

In addition, the autostereoscopic image display device 10 may further have a black matrix at a position other than a position corresponding to the sharp peak portion 151 of the lenticular lens-shaped pattern.

In a cross section in a direction perpendicular to the extending direction of the lenticular lens, the width Wb of the black matrix 220 is the sharp peak portion 151 of the lenticular lens-shaped pattern penetrating into the second electrode layer 120 . It may be 90 to 110% of the maximum width Wp.

As another specific example, the width Wb of the black matrix may be 100 to 110%, or 105 to 110% of the maximum width Wb of the peak portion.

In addition, in a cross section in a direction perpendicular to the extension direction of the lenticular lens (that is, the direction in which the lenticular lenses are arranged), the three-dimensional pixels 210 correspond to 1 to 50% of the pitch P of the lenticular lens shape. can have a width. As another specific example, the three-dimensional pixels may have a width corresponding to 2.5 to 20% or 3.6 to 14% of the pitch P of the lenticular lens shape.

The present invention will be described in more detail with reference to the following examples. However, the following examples only illustrate the present invention, and the scope of the present invention is not limited to these examples.

Example 1

Step (1) Manufacture of the top plate

A first electrode layer was formed by depositing a transparent conductive material on a transparent plastic substrate. A polymer resin having a refractive index of 1.5 was applied on the first electrode layer, molded using a tool on which a pattern was formed, and then cured to form a pattern in which concave lenticular lenses having a radius of 50 μm were arranged. The resulting patterned layer was provided with a number of sharp peaks.

Step (2) Preparation of the lower plate

A transparent conductive adhesive was applied on a transparent plastic substrate to form a second electrode layer. A polyimide alignment layer was formed on the surface of the second electrode layer, and the surface was rubbed using a fabric made of a material such as cotton or rayon to form fine scratches for aligning liquid crystal molecules in one direction.

Step (3) Cementation and liquid crystal injection step

The upper and lower plates obtained in steps (1) and (2) were bonded together, and the sharp peak of the pattern layer penetrated and penetrated the second electrode layer. At this time, the maximum width of the cross-section of the peak part penetrating into the second electrode layer was set to 10 μm. A liquid crystal having a normal refractive index (no) of 1.5 and an extraordinary refractive index (ne) of 1.7 was injected into the concave space of the pattern layer to manufacture a filter for a glasses-free stereoscopic display device.

Step (4) Attach with display panel

A display panel including three-dimensional pixels was disposed under the second substrate of the filter for the autostereoscopic glasses display device. In this case, a black matrix was inserted between the three-dimensional pixels, and the width of the three-dimensional pixel was set to 90 µm and the width of the black matrix was set to 10 µm.

Example 2

The same procedure as in Example 1 was repeated, but the maximum width of the cross-section of the peak part penetrating into the second electrode layer in step (3) was 20 μm, and liquid crystal was injected to prepare a filter for an autostereoscopic display device. .

Comparative Example 1

The same procedure as in Example 1 was repeated, but in step (3), the sharp peak of the pattern layer was cemented so that it did not penetrate and penetrate the second electrode layer, and then liquid crystal was injected to prepare a filter for an autostereoscopic display device. .

The volume of the liquid crystal used in the above Examples and Comparative Examples and the cross-sectional width of the peak part are summarized in Table 1 below, and the design of the structure is shown in FIGS. .

division Liquid crystal filling volume
(Comparative Example 1) peak section width
(Attachment Contribution Width) Related drawings Example 1 about 78% 10 μm Figure 2a Example 2 about 56% 20 μm Figure 2b Comparative Example 1 100% 0 Fig. 3

As shown in Table 1, according to the configuration of Examples 1 and 2 of the present invention, the adhesion force is increased compared to Comparative Example 1, which is the conventional configuration, so that the durability against bending is improved, while the liquid crystal filling volume is reduced and the amount of liquid crystal used. can save

10: glasses-free stereoscopic image display device;
100: filter for glasses-free stereoscopic image display device
110: a first electrode layer, 120: a second electrode layer,
130: a first substrate, 140: a second substrate,
150: pattern layer, 151: peak portion,
160: liquid crystal, 200: display panel,
210: three-dimensional pixels, 220: black matrix
Wb: the width of the black matrix, Wp: the width of the peak portion,
c: the maximum height of the concave space, P: the pitch.

Claims (10)

(a) a first electrode layer;
(b) a second electrode layer disposed in parallel under the first electrode layer;
(c) a pattern layer disposed between the first electrode layer and the second electrode layer and having a pattern in which concave lenticular lenses are arranged on a lower surface; and
(d) a filter for a glasses-free stereoscopic image display device comprising liquid crystal injected into the concave space of the pattern layer,
Wherein the second electrode layer comprises an indium tin oxide (ITO) nanopowder adhesive as a transparent conductive adhesive,
A filter for a glasses-free stereoscopic image display device, wherein the sharp peak portion of the lenticular lens-shaped pattern penetrates and adheres to the second electrode layer.
The method of claim 1,
In a cross section in a direction perpendicular to the extension direction of the lenticular lens,
When the radius of the lenticular lens shape is R, and the height of the sharp peak of the lenticular lens shape pattern penetrating into the second electrode layer is h,
The h is 10 to 50% of the R, a filter for an autostereoscopic image display device.
3. The method of claim 2,
A filter for an autostereoscopic image display device, wherein the concave space of the pattern layer has a maximum height corresponding to 30 to 70% of the R.
delete The method of claim 1,
A filter for a glasses-free stereoscopic image display device, wherein the refractive index of the pattern layer matches any one of the extraordinary refractive index (ne) and the normal refractive index (no) of the liquid crystal.
6. The method of claim 5,
A filter for a glasses-free stereoscopic image display device, wherein the liquid crystal has the same refractive index or a different refractive index as that of the pattern layer depending on whether a current is applied.
(a) a first electrode layer;
(b) a second electrode layer disposed in parallel under the first electrode layer;
(c) a pattern layer disposed between the first electrode layer and the second electrode layer and having a pattern in which concave lenticular lenses are arranged on a lower surface;
(d) liquid crystal injected into the concave space of the pattern layer; and
(e) an autostereoscopic image display device comprising a plurality of three-dimensional pixels disposed under the second electrode layer,
Wherein the second electrode layer comprises an indium tin oxide (ITO) nanopowder adhesive as a transparent conductive adhesive,
A glasses-free stereoscopic image display device, wherein a sharp peak portion of the lenticular lens-shaped pattern penetrates and adheres to the second electrode layer.
8. The method of claim 7,
The autostereoscopic image display device further includes a black matrix inserted between the three-dimensional pixels, wherein the black matrix is disposed at a position corresponding to the sharp peak of the lenticular lens-shaped pattern. Device.
9. The method of claim 8,
In a cross section in a direction perpendicular to the extension direction of the lenticular lens,
The width of the black matrix is 90 to 110% of the maximum width of the sharp peak of the lenticular lens-shaped pattern penetrating into the second electrode layer, the autostereoscopic image display device.
8. The method of claim 7,
In a cross section in a direction perpendicular to the extension direction of the lenticular lens,
The stereoscopic pixels have a width corresponding to 1 to 50% of the pitch of the lenticular lens shape, an autostereoscopic image display device.

Images