KR20210136836A - Light route control member and display having the same - Google Patents

Abstract

The present invention relates to a light path control member including: a first substrate; a first electrode on the first substrate; a second substrate on the first substrate; a second electrode below the second substrate; and a light conversion unit between the first electrode and the second electrode. The light conversion unit includes alternating partition wall and accommodating portions. The accommodating portion includes a dispersion liquid and light conversion particles dispersed in the dispersion liquid. The accommodating portion is driven in an open or privacy mode depending on whether voltage is applied. A first voltage is applied during privacy-to-open mode conversion. Second and third voltages are applied during open-to-privacy mode conversion. At least one of the second and third voltages includes a pulse voltage.

Description

A light path control member and a display device including the same

Embodiments relate to a light path control member and a display device including the same.

The light-shielding film blocks the transmission of light from the light source. It is attached to the front of the display panel, which is a display device used for mobile phones, laptops, tablet PCs, vehicle navigation, and vehicle touch, and the angle of incidence of light when the display transmits the screen. Accordingly, it is used for the purpose of expressing clear image quality at the required viewing angle by adjusting the viewing angle of the light.

In addition, the light-shielding film is used for windows of vehicles or buildings to partially shield external light to prevent glare or to prevent the inside from being seen from the outside.

That is, the light blocking film may be a light path control member that controls a movement path of light to block light in a specific direction and transmit light in a specific direction. Accordingly, it is possible to control the viewing angle of the user by controlling the transmission angle of light by the light-shielding film.

On the other hand, such a light-shielding film is a light-shielding film that can always control the viewing angle regardless of the surrounding environment or the user's environment, and a switchable light-shielding film that allows the user to turn on/off the viewing angle control according to the surrounding environment or the user's environment. can be distinguished.

Such a switchable light blocking film can be implemented by filling the inside of the pattern part with particles that can move according to the application of a voltage and a dispersion liquid dispersing them, and the pattern part is changed into a light transmitting part and a light blocking part by dispersion and aggregation of the particles.

For example, by applying a positive voltage to negatively charged particles to move the particles in the direction of the electrode, the pattern part can be driven as a light transmitting part, and when converting into a light blocking part, a negative voltage is applied to disperse the particles. It can be dispersed inside.

In this case, when changing from the light blocking part to the light transmitting part, there is a problem in that the dispersion of the particles is not made well or the dispersion time of the particles is increased, so that the shielding properties of the optical path manufacturing member are deteriorated or the driving properties are deteriorated.

Accordingly, there is a need for a light path control member having a new structure capable of solving the problem of dispersibility of particles as described above.

The embodiment relates to a light path control member capable of improving driving characteristics of a pattern portion that changes into a light transmitting portion and a light blocking portion.

An optical path control member according to an embodiment includes: a first substrate; a first electrode disposed on the first substrate; a second substrate disposed on the first substrate; a second electrode disposed under the second substrate; and a light conversion unit disposed between the first electrode and the second electrode, wherein the light conversion unit comprises a barrier rib portion and a receiving unit which are alternately disposed, and the receiving unit comprises a dispersion liquid and light conversion particles dispersed in the dispersion liquid The accommodating unit is driven in a public mode and a privacy mode depending on whether a voltage is applied, and when converted from the privacy mode to the public mode, a first voltage is applied and converted from the public mode to the privacy mode. When a second voltage and a third voltage are applied, at least one of the second voltage and the third voltage includes a pulse voltage.

The light path controlling member according to the embodiment may improve the driving speed and driving characteristics when the light path controlling member is converted from the public mode to the privacy mode.

In detail, when moving the light conversion particles to be converted from the public mode to the privacy mode, by applying a pulse voltage capable of uniformly dispersing the light conversion particles with a constant magnitude, time and period, the light conversion particles in the privacy mode It can be uniformly dispersed in the dispersion.

Accordingly, it is possible to improve the driving speed and driving characteristics of the optical path control member by preventing the light conversion particles from being concentrated in a specific region.

1 and 2 are views illustrating a perspective view of a light path control member according to an embodiment.
3 and 4 are perspective views of a first substrate, a first electrode, a second substrate, and a second electrode of a light path control member according to an embodiment, respectively.
5 to 7 are perspective views illustrating the arrangement of the sealing part on the light path control member according to the embodiment.
8 and 9 are views illustrating cross-sectional views taken along area AA′ of FIG. 1 .
10 to 13 are views illustrating cross-sectional views taken along area AA′ of FIG. 1 for explaining the shapes of various accommodating parts excluding the sealing part in the light path control member according to the embodiment.
14 to 17 are views for explaining a method of driving an optical path control member according to the first embodiment.
18 to 22 are views for explaining a method of driving an optical path control member according to a third embodiment.
23 to 31 are diagrams illustrating changes in voltage according to Examples and Comparative Examples.
32 and 33 are cross-sectional views illustrating a display device to which a light path control member according to an exemplary embodiment is applied.
34 to 36 are diagrams for explaining an embodiment of a display device to which a light path control member according to an embodiment is applied.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical spirit of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected between embodiments. It can be combined and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be generally understood by those of ordinary skill in the art to which the present invention pertains, unless specifically defined and described explicitly. It may be interpreted as a meaning, and generally used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention. In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as "at least one (or more than one) of A and (and) B, C", it can be combined with A, B, and C. It may contain one or more of all possible combinations.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only used to distinguish the component from other components, and are not limited to the essence, order, or order of the component by the term.

And, when it is described that a component is 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also with the component It may also include a case of 'connected', 'coupled' or 'connected' due to another element between the other elements.

In addition, when it is described as being formed or disposed on "above (above) or below (below)" of each component, the top (above) or bottom (below) is one as well as when two components are in direct contact with each other. Also includes a case in which another component as described above is formed or disposed between two components.

In addition, when expressed as “up (up) or down (down)”, it may include the meaning of not only the upward direction but also the downward direction based on one component.

Hereinafter, an optical path control member according to an embodiment will be described with reference to the drawings. The optical path control member described below relates to a switchable optical path control member that drives in various modes according to electrophoretic particles moving by application of a voltage.

1 to 4 , the light path control member according to the embodiment includes a first substrate 110 , a second substrate 120 , a first electrode 210 , a second electrode 220 , and a light conversion unit. (300) may be included.

The first substrate 110 may support the first electrode 210 . The first substrate 110 may be rigid or flexible.

Also, the first substrate 110 may be transparent. For example, the first substrate 110 may include a transparent substrate capable of transmitting light.

The first substrate 110 may include glass, plastic, or a flexible polymer film. For example, the flexible polymer film is polyethylene terephthalate (PET), polycarbonate (Polycabonate, PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylic Polymethyl Methacrylate (PMMA), Polyethylene Naphthalate (PEN), Polyether Sulfone (PES), Cyclic Olefin Copolymer (COC), TAC (Triacetylcellulose) film, Polyvinyl alcohol ( Polyvinyl alcohol, PVA) film, polyimide (Polyimide, PI) film, may be made of any one of polystyrene (Polystyrene, PS), this is only one example, but is not necessarily limited thereto.

In addition, the first substrate 110 may be a flexible substrate having a flexible characteristic.

Also, the first substrate 110 may be a curved or bent substrate. That is, the optical path control member including the first substrate 110 may also be formed to have flexible, curved, or bent characteristics. For this reason, the light path control member according to the embodiment may be changed into various designs.

The first substrate 110 may extend in a first direction 1A, a second direction 2A, and a third direction 3A.

In detail, the first substrate 110 extends in a first direction 1A corresponding to the length or width direction of the first substrate 110 and in a direction different from the first direction 1A, and the first substrate A second direction 2A corresponding to the length or width direction of 110 , and a direction different from the first direction 1A and the second direction 2A, the thickness direction of the first substrate 110 . and a third direction 3A corresponding to .

For example, the first direction 1A may be defined as a longitudinal direction of the first substrate 110 , and the second direction 2A may be a first substrate ( 2A) perpendicular to the first direction 1A. 110 , and the third direction 3A may be defined as a thickness direction of the first substrate 110 . Alternatively, the first direction 1A may be defined as the first substrate 110 . ), the second direction 2A may be defined as a longitudinal direction of the first substrate 110 perpendicular to the first direction 1A, and the third direction 3A. may be defined in the thickness direction of the first substrate 110 .

Hereinafter, for convenience of description, the first direction 1A is the longitudinal direction of the first substrate 110 , the second direction 2A is the width direction of the first substrate 110 , and the second direction 1A is the width direction of the first substrate 110 . The three directions 3A will be described as the thickness direction of the first substrate 110 .

The first electrode 210 may be disposed on one surface of the first substrate 110 . In detail, the first electrode 210 may be disposed on the upper surface of the first substrate 110 . That is, the first electrode 210 may be disposed between the first substrate 110 and the second substrate 120 .

The first electrode 210 may include a transparent conductive material. For example, the first electrode 210 may include a conductive material having a light transmittance of about 80% or more. For example, the first electrode 210 may include indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, It may include a metal oxide such as titanium oxide.

The first electrode 210 may have a thickness of about 0.1 μm to about 0.5 μm.

Alternatively, the first electrode 210 may include various metals to realize low resistance. For example, the first electrode 210 may include chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), or molybdenum (Mo). At least one of gold (Au), titanium (Ti), and alloys thereof may be included.

Referring to FIG. 3 , the first electrode 210 may be disposed on the entire surface of one surface of the first substrate 110 . In detail, the first electrode 210 may be disposed as a surface electrode on one surface of the first substrate 110 . However, the embodiment is not limited thereto, and the first electrode 210 may be formed of a plurality of pattern electrodes having a uniform pattern such as a mesh or stripe shape.

For example, the first electrode 210 may include a plurality of conductive patterns. In detail, the first electrode 210 may include a plurality of mesh lines crossing each other and a plurality of mesh openings formed by the mesh lines.

Accordingly, even if the first electrode 210 includes a metal, the first electrode is not visually recognized from the outside, so that visibility may be improved. In addition, the light transmittance is increased by the openings, so that the luminance of the light path control member according to the embodiment may be improved.

The second substrate 120 may be disposed on the first substrate 110 . In detail, the second substrate 120 may be disposed on the first electrode 210 on the first substrate 110 .

The second substrate 120 may include a material capable of transmitting light. The second substrate 120 may include a transparent material. The second substrate 120 may include the same or similar material to the first substrate 110 described above.

For example, the second substrate 120 may include glass, plastic, or a flexible polymer film. For example, the flexible polymer film is polyethylene terephthalate (PET), polycarbonate (Polycabonate, PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylic Polymethyl Methacrylate (PMMA), Polyethylene Naphthalate (PEN), Polyether Sulfone (PES), Cyclic Olefin Copolymer (COC), TAC (Triacetylcellulose) film, Polyvinyl alcohol ( Polyvinyl alcohol, PVA) film, polyimide (Polyimide, PI) film, may be made of any one of polystyrene (Polystyrene, PS), this is only one example, but is not necessarily limited thereto.

In addition, the second substrate 120 may be a flexible substrate having a flexible characteristic.

Also, the second substrate 120 may be a curved or bent substrate. That is, the optical path control member including the second substrate 120 may also be formed to have flexible, curved, or bent characteristics. For this reason, the light path control member according to the embodiment may be changed into various designs.

The second substrate 120 may also extend in the first direction 1A, the second direction 2A, and the third direction 3A in the same manner as the first substrate 110 described above.

In detail, the second substrate 120 extends in a first direction 1A corresponding to the length or width direction of the second substrate 120 and in a direction different from the first direction 1A, and the second substrate A second direction 2A corresponding to the length or width direction of 120 , and a direction different from the first direction 1A and the second direction 2A, the thickness direction of the second substrate 120 . and a third direction 3A corresponding to .

For example, the first direction 1A may be defined as a longitudinal direction of the second substrate 120 , and the second direction 2A may be a second substrate ( 2A) perpendicular to the first direction 1A. 120 may be defined in a width direction, and the third direction 3A may be defined in a thickness direction of the second substrate 120 .

Alternatively, the first direction 1A may be defined as a width direction of the second substrate 120 , and the second direction 2A may be a second substrate 120 perpendicular to the first direction 1A. may be defined in a length direction of , and the third direction 3A may be defined as a thickness direction of the second substrate 120 .

Hereinafter, for convenience of description, the first direction 1A is the longitudinal direction of the second substrate 120 , the second direction 2A is the width direction of the second substrate 120 , and the second direction 1A is the width direction of the second substrate 120 . The three directions 3A will be described as the thickness direction of the second substrate 120 .

The second electrode 220 may be disposed on one surface of the second substrate 120 . In detail, the second electrode 220 may be disposed on the lower surface of the second substrate 120 . That is, the second electrode 220 may be disposed on a surface of the second substrate 120 and the first substrate 110 facing each other. That is, the second electrode 220 may be disposed to face the first electrode 210 on the first substrate 110 . That is, the second electrode 220 may be disposed between the first electrode 210 and the second substrate 120 .

The second electrode 220 may include the same or similar material to the first electrode 210 described above.

The second electrode 220 may include a transparent conductive material. For example, the second electrode 220 may include a conductive material having a light transmittance of about 80% or more. For example, the second electrode 220 may include indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, It may include a metal oxide such as titanium oxide.

The second electrode 220 may have a thickness of about 0.1 μm to about 0.5 μm.

Alternatively, the second electrode 220 may include various metals to realize low resistance. For example, the second electrode 220 may be chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), or molybdenum (Mo). At least one of gold (Au), titanium (Ti), and alloys thereof may be included.

Referring to FIG. 4 , the second electrode 220 may be disposed on the entire surface of one surface of the second substrate 120 . In detail, the second electrode 220 may be disposed as a surface electrode on one surface of the second substrate 120 . However, the embodiment is not limited thereto, and the second electrode 220 may be formed of a plurality of pattern electrodes having a uniform pattern such as a mesh or stripe shape.

For example, the second electrode 220 may include a plurality of conductive patterns. In detail, the second electrode 220 may include a plurality of mesh lines crossing each other and a plurality of mesh openings formed by the mesh lines.

Accordingly, even if the second electrode 220 includes a metal, the second electrode is not visually recognized from the outside, so that visibility may be improved. In addition, the light transmittance is increased by the openings, so that the luminance of the light path control member according to the embodiment may be improved.

The first substrate 110 and the second substrate 120 may have sizes corresponding to each other. The first substrate 110 and the second substrate 120 may have the same or similar size to each other.

In detail, the first length extending in the first direction 1A of the first substrate 110 is the same as the second length L2 extending in the first direction 1A of the second substrate 120 or They may have similar sizes.

For example, the first length and the second length may have a size of 300 mm to 400 mm.

In addition, the first width extending in the second direction 2A of the first substrate 110 may have the same or similar size as the second width extending in the second direction of the second substrate 120 . .

For example, the first width and the second width may have a size of 150 mm to 200 mm.

In addition, a first thickness extending in the third direction 3A of the first substrate 110 may be the same as or similar to a second thickness extending in the third direction of the second substrate 120 . .

For example, the first thickness and the second thickness may have a size of 30 μm to 200 μm.

Alternatively, the first substrate 110 and the second substrate 120 may have different sizes.

In detail, the first length extending in the first direction 1A of the first substrate 110 is equal to the second length L2 extending in the first direction 1A of the second substrate 120 and 300 mm to It can have the same similar length within the size range of 400 mm.

In addition, a first width extending in the second direction 2A of the first substrate 110 may have a second width extending in the second direction of the second substrate 120 within a size range of 150 mm to 200 mm. may have different sizes.

For example, the second width extending in the second direction of the second substrate 110 may be smaller than the size of the first width extending in the second direction 2A of the first substrate 110 .

Referring to FIG. 1 , the first substrate 110 and the second substrate 120 may be alternately disposed.

In detail, the first substrate 110 and the second substrate 120 may be disposed at positions crossing each other in the first direction 1A. In detail, the first substrate 110 and the second substrate 120 may be disposed so that the side surfaces of the substrates are staggered from each other.

Accordingly, the first substrate 110 may be disposed to protrude in one direction of the first direction 1A, and the second substrate 120 may protrude in the other direction of the first direction 1A. can be placed.

That is, the first substrate 110 may include a first protrusion protruding in one direction in the first direction 1A, and the second substrate 110 protruding in the other direction in the first direction 1A. It may include a second protrusion.

Accordingly, in the optical path control member 1000 , the region where the first electrode 210 is exposed on the first substrate 110 and the second electrode 220 are exposed under the second substrate 120 . It may include an area to be

That is, the first electrode 210 disposed on the first substrate 110 is exposed at the first protrusion, and the second electrode 220 disposed under the second substrate 120 is the The second protrusion may be exposed.

The first electrode 210 and the second electrode 220 exposed from the protrusions may be connected to an external printed circuit board through a pad part, which will be described below.

Alternatively, referring to FIG. 2 , the first substrate 110 and the second substrate 120 may be disposed at positions corresponding to each other. In detail, the first substrate 110 and the second substrate 120 may be arranged so that each side surface corresponds to each other.

Accordingly, the first substrate 110 may be disposed to protrude in one direction of the first direction 1A, and the second substrate 120 may also be disposed in one direction of the first direction 1A, that is, the It may be disposed to protrude in the same direction as the first substrate 110 .

That is, the first substrate 110 may include a first protrusion that protrudes in one direction in the first direction 1A, and the second substrate also protrudes in one direction in the first direction 1A. It may include a second protrusion.

That is, the first protrusion and the second protrusion may protrude in the same direction.

Accordingly, in the optical path control member 1000 , the region where the first electrode 210 is exposed on the first substrate 110 and the second electrode 220 are exposed under the second substrate 120 . It may include an area to be

That is, the first electrode 210 disposed on the first substrate 110 is exposed at the first protrusion, and the second electrode 220 disposed under the second substrate 120 is the The second protrusion may be exposed.

The first electrode 210 and the second electrode 220 exposed from the protrusions may be connected to an external printed circuit board through a connection part to be described below.

The light conversion unit 300 may be disposed between the first substrate 110 and the second substrate 120 . In detail, the light conversion unit 300 may be disposed between the first electrode 210 and the second electrode 220 .

An adhesive layer or a buffer layer may be disposed between the light conversion unit 300 and the first substrate 110 or between at least one of the light conversion unit 300 and the second substrate 120 , and the adhesive layer and/or the first substrate 110 , the second substrate 120 , and the light conversion unit 300 may be adhered to each other by a buffer layer.

The light conversion unit 300 may include a plurality of barrier ribs and a receiving unit. Light conversion particles that move according to the application of voltage may be disposed in the accommodating part, and a light transmission characteristic of the light path control member may be changed by the light conversion particles.

The light path control member may include a sealing part.

5 to 7 , a sealing part may be disposed on the outer surface of the light path control member.

The sealing part 500 may be disposed while covering the outer surface of the light path control member. In detail, the sealing part 500 may be disposed while partially covering the outer surface of the light path control member. That is, the sealing part 500 may be disposed while extending from the first substrate 110 to the second substrate 120 and partially covering the outer surface of the optical path control member.

The light path control member 1000 may include a plurality of side surfaces. In detail, the light path control member 1000 may include side surfaces extending in the first direction 1A and facing each other and side surfaces extending in the second direction 2A and facing each other.

The sealing part 500 may be disposed while surrounding the side surfaces of the light path control member extending in the first direction 1A. For example, the sealing unit 500 may be disposed while surrounding the side surfaces of the light path control member to which the receiving unit 320 in which the light converting particles are disposed in the light converting unit 300 is exposed.

In detail, the sealing part 500 may be partially disposed on the side surface of the optical path control member while covering the receiving part 320 exposed from the side surface of the optical path control member as shown in FIG. 5 .

Alternatively, the sealing part 500 may be entirely disposed on the side surface of the optical path control member while covering the receiving part 320 exposed from the side surface of the optical path control member as shown in FIG. 6 .

In detail, the accommodating part 320 may be disposed to extend from the light conversion part 300 in the second direction 2A with respect to the first substrate 110 and the second substrate 120 . . That is, the plurality of accommodating parts 320 may be disposed to extend in the second direction 2A while being spaced apart from each other.

Accordingly, the receiving part 320 may be exposed in both lateral directions of the first direction 1A of the light converting part 300 . The sealing part 500 may be disposed while covering the accommodating part 320 exposed by the light converting part 300 to protect the light converting particles inside the exposed accommodating part.

That is, the sealing part 500 may be disposed on a part of a side surface of the light conversion part 300 , a part of a lower surface of the first substrate 110 , and a part of an upper surface of the second substrate 120 . have. In other words, the sealing part 500 surrounds the exposed accommodating part of the light conversion part and includes a part of a side surface of the light conversion part 300 , a part of the lower surface of the first substrate 110 and the second substrate ( 120) may be disposed on a portion of the upper surface.

The sealing part 500 may include a resin material having a viscosity of 300 cP or more.

Alternatively, referring to FIG. 7 , the sealing part 500 may be formed between side surfaces of the light path controlling member extending in the first direction 1A and the light path controlling member extending in the second direction 2A. It may be disposed while enclosing the sides.

Accordingly, at least one of the side surfaces of the light conversion unit 300 in the second direction may also be entirely covered by the sealing unit 500 .

Accordingly, in the light path control member according to the embodiment, the outer surface of the light conversion unit 300 may be entirely sealed by the sealing unit 500 . That is, it is possible to prevent the penetration of impurities, such as moisture and air, that may penetrate into the accommodating part from the side in the second direction of the light conversion part 300 .

That is, during the manufacturing process of the light path control member, the thicknesses of the side surfaces of the light conversion unit 300 in the second direction may be different from each other due to tolerance, and the width of any one of the side surfaces in the second direction is small. is formed so that impurities that can permeate into the accommodating part may permeate into the accommodating part through the partition wall part.

In the light path control member according to the embodiment, by disposing the sealing part on the side surface in the second direction of the light conversion part, it is possible to effectively prevent impurity penetration according to the size of the partition wall part.

Meanwhile, although it is illustrated that the sealing unit is disposed on the outer surface of the light path member in FIGS. 5 to 7 , the embodiment is not limited thereto, and may be disposed on the upper surface of the light conversion unit 300 .

For example, the light conversion part 300 includes an accommodating part area not filled with the dispersion, and the sealing part fills the accommodating part area not filled with the dispersion liquid on the light conversion part 300 , and the adhesive layer 420 . ), the second electrode 220 and the side surfaces of the second substrate 120 in the first direction and the upper surface of the second substrate 120 may be partially covered.

That is, when manufacturing a plurality of light path controlling members by cutting a large-area light path controlling member, a sealing portion may be formed as shown in FIGS. 5 to 7 , and when manufacturing a small-area light path controlling member, the above The sealing part may be disposed on the light conversion part 300 while filling an area of the accommodating part where the dispersion liquid is not filled.

8 and 9 , the light conversion unit 300 may include a partition wall 310 and a receiving unit 320 .

The partition wall part 310 may be defined as a partition wall area dividing the accommodation part. That is, the barrier rib portion 310 may transmit light as a barrier rib region dividing the plurality of accommodation units. In addition, the accommodating part 320 may be defined as a region that changes into a light blocking part and a light transmitting part according to the application of a voltage.

The partition wall part 310 and the accommodating part 320 may be alternately disposed with each other. The partition wall part 310 and the accommodating part 320 may be disposed to have different widths. For example, the width of the partition wall portion 310 may be greater than the width of the receiving portion 320 .

The partition wall part 310 and the accommodating part 320 may be alternately disposed with each other. In detail, the partition wall part 310 and the accommodating part 320 may be alternately disposed with each other. That is, each of the partition wall portions 310 may be disposed between the accommodating portions 320 adjacent to each other, and each of the accommodating portions 320 may be disposed between the adjacent partition wall portions 310 .

The partition wall part 310 may include a transparent material. The barrier rib part 310 may include a material capable of transmitting light.

The partition wall part 310 may include a resin material. For example, the barrier rib part 310 may include a photo-curable resin material. For example, the barrier rib part 310 may include a UV resin or a transparent photoresist resin. Alternatively, the partition wall portion 310 may include a urethane resin or an acrylic resin.

The barrier rib part 310 may transmit light incident on one of the first substrate 110 and the second substrate 120 in the direction of the other substrate.

For example, in FIGS. 8 and 9 , light is emitted from the first substrate 110 by a light source disposed under the first substrate 110 and the light is incident in the direction of the second substrate 120 . In this case, the barrier rib part 310 may transmit the light, and the transmitted light may move in the direction of the second substrate 120 .

The accommodating part 320 may include a dispersion 320a and light conversion particles 320b. Specifically, the accommodating part 320 is filled by injecting the dispersion 320a into the dispersion 320a. A plurality of light conversion particles 320b may be dispersed.

The dispersion liquid 320a may be a material for dispersing the light conversion particles 320b. The dispersion 320a may include a transparent material. The dispersion 320a may include a non-polar solvent. In addition, the dispersion 320a may include a material capable of transmitting light. For example, the dispersion liquid 320a may include at least one of a halocarbon-based oil, a paraffin-based oil, and isopropyl alcohol.

The light conversion particles 320b may be dispersed in the dispersion 320a. In detail, the plurality of light conversion particles 320b may be disposed to be spaced apart from each other in the dispersion 320a.

The light conversion particles 320b may include a material capable of absorbing light. That is, the light conversion particles 320b) may be light absorbing particles, and the light conversion particles 320b may have a color. For example, the light conversion particles 320b may have a black-based color. For example, the light conversion particles 320b may include carbon black particles.

The light conversion particle 320b may have a polarity due to its surface being charged. For example, the surface of the light conversion particle 320b may be negatively charged. Accordingly, according to the application of the voltage, the light conversion particles 320b may move in the direction of the first electrode 210 or the second electrode 220 .

The light transmittance of the receiving part 320 may be changed by the light conversion particles 320b. In detail, the accommodating part 320 may be changed into a light blocking part and a light transmitting part by changing the light transmittance by the light conversion particles 320b. That is, the accommodating part 320 may change the transmittance of light passing through the accommodating part 320 by dispersion and aggregation of the light conversion particles 320b disposed therein in the dispersion 320a.

For example, the light path member according to the embodiment changes from the first mode to the second mode or from the second mode to the first mode by a voltage applied to the first electrode 210 and the second electrode 220 . can be

In detail, in the light path control member according to the embodiment, in the first mode, the accommodating part 320 may be a light blocking part, and light at a specific angle may be blocked by the accommodating part 320 . That is, the viewing angle of the user viewing from the outside is narrowed, so that the light path control member may be driven in the privacy mode.

In addition, in the light path control member according to the embodiment, in the second mode, the accommodating part 320 becomes a light transmitting part, and in the light path controlling member according to the embodiment, the partition wall 310 and the accommodating part 320 . All light can be transmitted. That is, the viewing angle of the user viewing from the outside is widened, so that the light path control member may be driven in the open mode.

The conversion from the first mode to the second mode, that is, the conversion of the accommodating part 320 from the light blocking part to the light transmitting part, is implemented by the movement of the light conversion particles 320b of the accommodating part 320 . can That is, the light conversion particle 320b has a charge on its surface, and may move in the direction of the first electrode or the second electrode according to the application of a voltage according to the characteristics of the charge. That is, the light conversion particle 320b may be an electrophoretic particle.

In detail, the receiving part 320 may be electrically connected to the first electrode 210 and the second electrode 220 .

At this time, when no voltage is applied to the optical path control member from the outside, the light conversion particles 10 of the accommodating part 320 are uniformly dispersed in the dispersion 320a and, accordingly, the accommodating part 320 . light may be blocked by the light conversion particles 320b. Accordingly, in the first mode, the receiving unit 320 may be driven as a light blocking unit.

Alternatively, when a voltage is applied to the light path control member from the outside, the light conversion particles 320b may move. For example, the light conversion particle 320b may be moved toward one end or the other end of the receiving unit 320 by a voltage transmitted through the first electrode 210 and the second electrode 220 . can That is, the light conversion particles 10 may move in the direction of the first electrode 210 or the second electrode 220 .

In detail, when a voltage is applied to the first electrode 210 and/or the second electrode 220, an electric field is formed between the first electrode 210 and the second electrode 220, The negatively charged light conversion particles 320b may move toward the positive electrode of the first electrode 210 and the second electrode 220 using the dispersion 320a as a medium.

That is, when a voltage is applied to the first electrode 210 and/or the second electrode 220 , as shown in FIG. 8 , the light conversion particle 10 is the first electrode in the dispersion 320a. It may move in the (210) direction, that is, the light conversion particles 320b may be moved in one direction, and the receiving unit 320 may be driven as a light transmitting unit.

Alternatively, when no voltage is applied to the first electrode 210 and/or the second electrode 220 , as shown in FIG. 9 , the light conversion particles 320b are uniformly dispersed in the dispersion liquid 320a. Thus, the accommodating part 320 may be driven as a light blocking part.

Accordingly, the light path control member according to the embodiment may be driven in two modes according to the user's surrounding environment. That is, when the user wants to transmit light only at a specific viewing angle, the receiving unit is driven as a light blocking unit, or in an environment in which the user requires a wide viewing angle and high luminance, a voltage is applied to drive the receiving unit as a light transmitting unit. have.

Accordingly, since the light path control member according to the embodiment can be implemented in two modes according to the user's request, the light path member can be applied regardless of the user's environment.

Meanwhile, the accommodating part may be arranged in a different shape in consideration of driving characteristics and the like.

10 and 11 , in the light path control member according to another embodiment, both ends of the receiving part 320 are in contact with the buffer layer 410 and the adhesive layer 420 differently from FIGS. 8 and 9 , and may be disposed. have.

For example, a lower portion of the receiving portion 320 may be disposed in contact with the buffer layer 410 , and an upper portion of the receiving portion 320 may be disposed in contact with the adhesive layer 420 .

Accordingly, the distance between the accommodating part 320 and the first electrode 210 may be reduced, so that the voltage applied from the first electrode 210 may be smoothly transmitted to the accommodating part 320 .

Accordingly, the moving speed of the light conversion particle 320b inside the receiving part 320 may be improved, and thus the driving characteristics of the light path control member may be improved.

In addition, referring to FIGS. 12 and 13 , in the light path control member according to the embodiment, unlike FIGS. 8 and 9 , the receiving part 320 may be disposed while having a constant inclination angle θ.

In detail, referring to FIGS. 12 and 13 , the receiving part 320 may be disposed while having an inclination angle θ of greater than 0° to less than 90° with respect to the first substrate 110 . In detail, the accommodating part 320 may extend upwardly while having an inclination angle θ of greater than 0° to less than 90° with respect to one surface of the first substrate 110 .

Accordingly, when the light path member is used together with the display panel, moire caused by the overlapping phenomenon between the pattern of the display panel and the receiving portion 320 of the light path member may be alleviated, thereby improving user visibility.

Meanwhile, the light path control member according to the embodiment may control the magnitude and time of an applied voltage to improve the movement characteristics of the light conversion particles.

Hereinafter, the magnitude and time of the voltage applied to the light path control member capable of improving the movement characteristics of the light conversion particles will be described in detail.

When the optical path control member according to the embodiment is converted into the first mode (privacy mode), the second mode (public mode), and the first mode (privacy mode), the characteristics of the applied voltage are variously changed, so that the second When the mode is changed to the first mode, the light shielding property of the light path controlling member may be improved, and the driving speed of the light path controlling member may be improved.

The light path control member in a state in which no voltage is applied maintains the first mode. Subsequently, when a first voltage having a positive voltage is applied to the first electrode 210 or the second electrode 220 , the light conversion particles 320b may move and change to the second mode. In the following description, for convenience of explanation, a case in which the first voltage is applied to the first electrode 210 will be mainly described.

In detail, when a first voltage having a positive voltage is applied to the first electrode 210 , the light conversion particles 320b having a negative charge move in the direction of the first electrode 210 , and the receiving part 320 . may be aggregated in the direction of the first electrode 210 . Accordingly, the light path control member may be converted from the first mode to the second mode.

Subsequently, when a second voltage having a negative voltage is applied to the first electrode 210 , the light conversion particles 320b having a negative charge move in the opposite direction to the first electrode 210 in the receiving part 320 . It can be moved to and dispersed again in the dispersion 320a. Accordingly, the light path control member may change from the second mode to the first mode.

When the light path control member according to the embodiment is converted to the second mode (public mode) and the first mode (privacy mode), the light conversion particles 320b can be uniformly dispersed in the dispersion 320a. We want to provide a driving method.

First, a method of driving the light path control member according to the first embodiment will be described.

When the optical path control member according to the first embodiment changes from the second mode (public mode) to the first mode (privacy mode), a second voltage having a negative voltage and a third voltage having a pulse voltage are applied together. can do. In detail, the second voltage may be first applied, and then the third voltage may be applied thereafter.

The second voltage may move the light conversion particles 320b. In detail, according to the application of the second voltage, the light conversion particles 320b may be moved in a direction away from the first electrode 210 .

The magnitude of the second voltage may be the same as or similar to the magnitude of the first voltage. Here, the magnitude of the first voltage and the magnitude of the second voltage may be defined as the magnitude of an absolute value of the voltage.

In detail, the magnitude of the second voltage may have a magnitude of 50% to 150% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may have a magnitude of 70% to 130% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may have a magnitude of 80% to 120% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may have a magnitude of 90% to 110% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may have a magnitude of 95% to 105% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may have a magnitude of 99% to 11% of the magnitude of the first voltage.

For example, the magnitude of the second voltage may have a magnitude of about +35V to -45V.

The third voltage may have a pulse voltage that repeats a positive voltage and a negative voltage. The third voltage may disperse the light conversion particles 320b. In detail, according to the application of the third voltage, while repeatedly moving in the direction of the first electrode 210 and the direction of the second electrode 220 within the dispersion 320a, the light conversion particles 320b, the dispersion ( 320a) may be uniformly dispersed therein.

In the third voltage, magnitudes of the positive voltage and the negative voltage may be the same as or similar to those of the first voltage. Here, the magnitude of the positive voltage and the negative voltage of the third voltage may be defined as the magnitude of the absolute value of the voltage.

In addition, magnitudes of the positive voltage and the negative voltage of the third voltage may be the same as or different from each other.

In detail, the magnitude of the positive voltage and the negative voltage in the third voltage may have a magnitude of 25% to 150% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage in the third voltage may have a magnitude of 50% to 130% of the magnitude of the first voltage. In more detail, in the third voltage, the magnitudes of the positive voltage and the negative voltage may have a magnitude of 80% to 120% of the magnitude of the first voltage. In more detail, the magnitudes of the positive voltage and the negative voltage in the third voltage may have a magnitude of 90% to 110% of the magnitude of the first voltage. In more detail, in the third voltage, the magnitude of the positive voltage and the negative voltage may have a magnitude of 95% to 105% of the magnitude of the first voltage. In more detail, the magnitudes of the positive voltage and the negative voltage in the third voltage may have a magnitude of 99% to 11% of the magnitude of the first voltage.

For example, when the first voltage has a magnitude of +35V to +45V, the positive voltage of the third voltage may have a magnitude of +10V to +65V, and the negative voltage is -10V to -65V can have the size of

Also, in the third voltage, a difference in magnitude between the negative voltage and the positive voltage may be the same as or similar to a difference in magnitude between the first voltage and the second voltage.

In detail, in the third voltage, a difference in magnitude between the negative voltage and the positive voltage may have a magnitude of 50% to 150% with respect to a magnitude difference between the first voltage and the second voltage. In more detail, in the third voltage, the difference in magnitude between the negative voltage and the positive voltage may have a magnitude of 70% to 130% with respect to the magnitude difference between the first voltage and the second voltage. In more detail, in the third voltage, a difference in magnitude between the negative voltage and the positive voltage may have a magnitude of 80% to 120% with respect to a magnitude difference between the first voltage and the second voltage. In more detail, in the third voltage, a difference in magnitude between the negative voltage and the positive voltage may have a magnitude of 90% to 110% with respect to a magnitude difference between the first voltage and the second voltage. In more detail, in the third voltage, a difference in magnitude between the negative voltage and the positive voltage may have a magnitude of 95% to 105% with respect to a magnitude difference between the first voltage and the second voltage. In more detail, in the third voltage, a difference in magnitude between the negative voltage and the positive voltage may have a magnitude of 99% to 11% with respect to a magnitude difference between the first voltage and the second voltage.

The third voltage may be repeated at a predetermined number of cycles in which the negative voltage and the positive voltage are repeated. For example, in the third voltage, the negative voltage and the positive voltage may be repeated in a cycle of about 10 to 15 times.

Each of the second voltage and the third voltage may be applied at a constant time. In detail, the total application time, which is the sum of the application time of the second voltage and the application time of the third voltage, may be 3 seconds or less. When the sum of the application time of the second voltage and the application time of the third voltage exceeds 3 seconds, the conversion time from the second mode to the first mode of the optical path control member is increased to increase the optical path The overall driving speed of the control member may be reduced.

For example, the application time of the second voltage and the application time of the third voltage may be applied such that the total application time is equal to or greater than 3 seconds. Preferably, the application time of the third voltage for dispersing the light conversion particles may be greater than the application time of the second voltage.

14 to 17 are diagrams for explaining the movement of light conversion particles according to the application of voltage according to the first embodiment.

Referring to FIG. 14 , when the first voltage is applied, the light conversion particles 320b may move in the direction of the first electrode 210 .

Subsequently, referring to FIG. 15 , when the second voltage is applied, the light conversion particles 320b may move in a direction opposite to the first electrode 210 as indicated by an arrow. That is, the light conversion particles 320b may move in the direction of the second electrode 220 .

Subsequently, referring to FIG. 16 , when the third voltage is applied, the light conversion particles 320b move in the direction of the first electrode 210 and the second electrode 220 as indicated by the arrow repeatedly. As it is, it may be dispersed in the dispersion 320a.

Then, referring to FIG. 17 , when it becomes 0V, which is the end of the pulse voltage, the light conversion particles 320b may be uniformly dispersed in the dispersion liquid 320a.

Hereinafter, a method of driving the light path control member according to the second embodiment will be described.

The optical path control member according to the second embodiment applies a second voltage having a negative voltage and a third voltage having a pulse voltage together when switching to the second mode (public mode) and the first mode (privacy mode) can do. In detail, the second voltage may be first applied, and then the third voltage may be applied thereafter.

The driving method of the optical path control member according to the second embodiment may be the same as the driving method of the optical path control member according to the first embodiment, except that the driving method of the third voltage is different.

In the method of driving the optical path control member according to the second embodiment, the application time of the positive voltage and the negative voltage in the third voltage having a pulse voltage may be different.

In detail, in the second embodiment, the application time of the negative voltage in the third voltage may be longer than the application time of the positive voltage.

For example, in the third voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 9:1. In detail, in the third voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 7:1. In more detail, in the third voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 5:1. In more detail, in the third voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 3:1.

By differentiating the application time of the negative voltage and the application time of the positive voltage in the third voltage, the light conversion particles may be uniformly dispersed in various environments. That is, when the magnitude of the second voltage that moves the light conversion particles is applied to be smaller than the desired magnitude or the application time of the second voltage is applied to be smaller than the desired time, the time of the negative voltage of the third voltage is greater than the time of the positive voltage. Thus, the light conversion particles can be uniformly dispersed in the dispersion.

Hereinafter, a method of driving the light path control member according to the third embodiment will be described.

The optical path control member according to the third embodiment applies a second voltage having a pulse voltage and a third voltage having a pulse voltage together when switching to the second mode (public mode) and the first mode (privacy mode) can do. In detail, the second voltage may be first applied, and then the third voltage may be applied thereafter. That is, the light path control member according to the third exemplary embodiment may have a pulse voltage as well as the second voltage, unlike the first and second exemplary embodiments described above.

The second voltage may have a pulse voltage that repeats a positive voltage and a negative voltage. The second voltage may move and disperse the light conversion particles 320b. In detail, according to the application of the negative voltage of the second voltage, the light conversion particles 320b move in the direction of the first electrode 210 in the dispersion 320a, and the negative voltage and the positive voltage of the second voltage According to the application of , while repeatedly moving in the direction of the first electrode 210 and the second electrode 220 , the dispersion liquid 320a may be uniformly dispersed in the inside.

That is, the second voltage may be a pulse voltage in which the negative voltage is first applied, and then the positive voltage and the negative voltage are repeated.

The magnitude of the positive voltage and the negative voltage in the second voltage may be the same as or similar to the magnitude of the first voltage. Also, the initial negative voltage level of the second voltage may be the same as or similar to the positive voltage level of the first voltage. Here, the magnitude of the positive voltage and the negative voltage of the second voltage may be defined as an absolute value magnitude of the voltage.

In addition, magnitudes of the positive voltage and the negative voltage of the second voltage may be the same as or different from each other.

In detail, the magnitude of the positive voltage and the negative voltage in the second voltage may have a magnitude of 25% to 150% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage in the second voltage may have a magnitude of 50% to 130% of the magnitude of the second voltage. In more detail, the magnitude of the positive voltage and the negative voltage in the second voltage may have a magnitude of 80% to 120% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage in the second voltage may have a magnitude of 90% to 110% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage in the second voltage may have a magnitude of 95% to 105% of the magnitude of the first voltage. In more detail, in the second voltage, the magnitude of the positive voltage and the negative voltage may have a magnitude of 99% to 11% of the magnitude of the first voltage.

For example, when the first voltage has a magnitude of +35V to +45V, the positive voltage of the second voltage may have a magnitude of +10V to +65V, and the negative voltage is -10V to -65V can have the size of

Also, in the second voltage, a difference in magnitude between the negative voltage and the positive voltage may be the same as or similar to a difference in magnitude between the initial voltages of the first voltage and the second voltage.

In detail, the difference in magnitude between the negative voltage and the positive voltage in the second voltage may have a magnitude of 50% to 150% with respect to a magnitude difference between the initial voltages of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the second voltage may have a magnitude of 70% to 130% with respect to a magnitude difference between the magnitudes of the initial voltages of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the second voltage may have a magnitude of 80% to 120% with respect to a magnitude difference between the initial voltages of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the second voltage may have a magnitude of 90% to 110% with respect to a magnitude difference between the initial voltage of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the second voltage may have a magnitude of 95% to 105% of a magnitude difference between the initial voltage of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the second voltage may have a magnitude of 99% to 11% with respect to a magnitude difference between the initial voltages of the first voltage and the second voltage.

The second voltage may be repeated at a predetermined number of cycles in which the negative voltage and the positive voltage are repeated. For example, as for the second voltage, the negative voltage and the positive voltage may be repeated in a cycle of about 3 to 5 times.

The application time of the negative voltage of the second voltage and the application time of the positive voltage may be different.

In the second voltage, the application time of the negative voltage may be longer than the application time of the positive voltage.

For example, in the second voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 9:1. In detail, in the second voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 8:1. In more detail, in the second voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 7:1.

The third voltage may have a pulse voltage that repeats a positive voltage and a negative voltage. The third voltage may disperse the light conversion particles 320b. In detail, according to the application of the third voltage, while repeatedly moving in the direction of the first electrode 210 and the direction of the second electrode 220 within the dispersion 320a, the light conversion particles 320b, the dispersion ( 320a) may be uniformly dispersed therein.

In the third voltage, magnitudes of the positive voltage and the negative voltage may be the same as or similar to those of the first voltage. Here, the magnitude of the positive voltage and the negative voltage of the third voltage may be defined as the magnitude of the absolute value of the voltage.

In addition, magnitudes of the positive voltage and the negative voltage of the third voltage may be the same as or different from each other.

In detail, the magnitude of the positive voltage and the negative voltage in the third voltage may have a magnitude of 25% to 150% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage in the third voltage may have a magnitude of 50% to 130% of the magnitude of the first voltage. In more detail, in the third voltage, the magnitudes of the positive voltage and the negative voltage may have a magnitude of 80% to 120% of the magnitude of the first voltage. In more detail, the magnitudes of the positive voltage and the negative voltage in the third voltage may have a magnitude of 90% to 110% of the magnitude of the first voltage. In more detail, in the third voltage, the magnitude of the positive voltage and the negative voltage may have a magnitude of 95% to 105% of the magnitude of the first voltage. In more detail, the magnitudes of the positive voltage and the negative voltage in the third voltage may have a magnitude of 99% to 11% of the magnitude of the first voltage.

For example, when the first voltage has a magnitude of +35V to +45V, the positive voltage of the third voltage may have a magnitude of +10V to +65V, and the negative voltage is -10V to -65V can have the size of

Also, in the third voltage, a difference in magnitude between the negative voltage and the positive voltage may be the same as or similar to a difference in magnitude between the initial voltages of the first voltage and the second voltage.

In detail, the difference in magnitude between the negative voltage and the positive voltage in the third voltage may have a magnitude of 50% to 150% of the magnitude difference between the initial voltages of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the third voltage may have a magnitude of 70% to 130% of the magnitude difference between the initial voltages of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the third voltage may have a magnitude of 80% to 120% of the magnitude difference between the magnitudes of the initial voltages of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the third voltage may have a magnitude of 90% to 110% of the magnitude difference between the initial voltages of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the third voltage may have a magnitude of 95% to 105% of the magnitude difference between the initial voltages of the first voltage and the second voltage. In more detail, the difference in magnitude between the negative voltage and the positive voltage in the third voltage may have a magnitude of 99% to 11% with respect to the magnitude difference between the initial voltages of the first voltage and the second voltage.

The third voltage may be repeated at a predetermined number of cycles in which the negative voltage and the positive voltage are repeated. The number of cycles of the third voltage may be different from the number of cycles of the second voltage. In detail, the number of cycles of the third voltage may be greater than the number of cycles of the second voltage.

For example, as for the third voltage, the negative voltage and the positive voltage may be repeated in a cycle of about 7 to 13 times.

Each of the second voltage and the third voltage may be applied at a constant time. In detail, the total application time, which is the sum of the application time of the second voltage and the application time of the third voltage, may be 3 seconds or less. When the sum of the application time of the second voltage and the application time of the third voltage exceeds 3 seconds, the conversion time from the second mode to the first mode of the optical path control member is increased to increase the optical path The overall driving speed of the control member may be reduced.

For example, the application time of the second voltage and the application time of the third voltage may be applied such that the total application time is equal to or greater than 3 seconds. Preferably, the application time of the third voltage for dispersing the light conversion particles may be greater than the application time of the second voltage.

18 to 22 are diagrams for explaining the movement of light conversion particles according to the application of voltage according to the third embodiment.

Referring to FIG. 18 , when the first voltage is applied, the light conversion particles 320b may move toward the first electrode 210 .

Then, referring to FIGS. 19 and 20 , when the second voltage is applied, the light conversion particles 320b may move in the opposite direction of the first electrode 210 as shown in the arrow direction of FIG. 19 . . That is, the light conversion particles 320b may move in the direction of the second electrode 220 . In addition, referring to FIG. 20 , the light conversion particles 320b are dispersed in the dispersion liquid 320a while the movement in the direction of the first electrode 210 and the second electrode 220 is repeated as indicated by the arrow direction. can be

Subsequently, referring to FIG. 21 , when the third voltage is applied, the light conversion particles 320b move in the direction of the first electrode 210 and the second electrode 220 again in the direction of the arrow. As it is repeated, it may be dispersed in the dispersion 320a.

Subsequently, referring to FIG. 22 , when it becomes 0V, which is the end of the pulse voltage, the light conversion particles 320b may be uniformly dispersed in the dispersion liquid 320a.

Hereinafter, a method of driving the light path control member according to the fourth embodiment will be described.

The optical path control member according to the fourth embodiment applies a second voltage having a pulse voltage and a third voltage having a pulse voltage together when switching to the second mode (public mode) and the first mode (privacy mode) can do. In detail, the second voltage may be first applied, and then the third voltage may be applied thereafter.

The driving method of the optical path controlling member according to the fourth embodiment may be the same as the driving method of the optical path controlling member according to the fourth embodiment, except that the driving method of the third voltage is different.

In the method of driving the optical path control member according to the fourth embodiment, the application time of the positive voltage and the negative voltage may be different from the third voltage having a pulse voltage.

In detail, in the fourth embodiment, the application time of the negative voltage in the third voltage may be longer than the application time of the positive voltage.

For example, in the third voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 9:1. In detail, in the third voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 7:1. In more detail, in the third voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 5:1. In more detail, in the third voltage, the application time of the negative voltage and the application time of the positive voltage may be greater than 1:1 to 3:1.

By differentiating the application time of the negative voltage and the application time of the positive voltage in the third voltage, the light conversion particles may be uniformly dispersed in various environments. That is, when the magnitude of the second voltage that moves the light conversion particles is applied to be smaller than the desired magnitude or the application time of the second voltage is applied to be smaller than the desired time, the time of the negative voltage of the third voltage is greater than the time of the positive voltage. Thus, the light conversion particles can be uniformly dispersed in the dispersion.

The light path control member according to the embodiments may improve the dispersibility of the light conversion particles when converting to the second mode (public mode) and the first mode (privacy mode), thereby improving shielding properties in the first mode have.

That is, since the step of dispersing the light conversion particles by applying a pulse voltage is included, the light conversion particles are more uniformly dispersed in the dispersion liquid in the second mode, so that the first mode of the light path control member light transmittance may be reduced.

Accordingly, the driving characteristics and driving speed of the optical path control member can be improved.

Hereinafter, the present invention will be described in more detail by measuring transmittance of the light path control member according to Examples and Comparative Examples. These embodiments are merely presented as examples in order to explain the present invention in more detail. Therefore, the present invention is not limited to these examples.

On the other hand, the light transmittance of the light path control member described below is determined by the luminance A of light emitted from the light source in a state in which the light path control member is not disposed, and the light from the light source by disposing the light path control member on the light source. After measuring the luminance (B) of light emitted at an angle of 45° through the path control member, it may be defined as the measured light transmittance by (B/A)*100.

Also, the pulse voltage applied to the optical path control member described below may be measured by checking the on/off voltage of the oscilloscope device. That is, voltage application patterns of both electrodes were measured by biting voltage measuring terminals to both electrodes using an oscilloscope device.

Example 1

The first light transmittance in the initial mode in which no voltage was applied was measured.

Then, a voltage of +40V was applied to the optical path controlling member in the initial mode to which no voltage was applied, thereby converting the optical path controlling member to the open mode.

Then, a voltage of -40V is applied for a time of 1.4 seconds, a pulse voltage having negative and positive voltages of -20V and -10V is repeated for 1.6 seconds as many as 13 cycles, and then the voltage is adjusted to 0V to control the optical path The absence was converted to privacy mode.

When the optical path control member is completely switched to the privacy mode, a separate voltage is not applied to the optical path control member.

Then, the second light transmittance in privacy mode was measured.

Then, the difference between the second light transmittance and the first light transmittance was measured.

Example 2

After repeating 13 cycles of pulse voltages with negative and positive voltages of -20V and +20V for 1.6 seconds, the voltage was adjusted to 0V, except that the optical path control member was converted to privacy mode. In the same manner as in Example 1, the difference between the second light transmittance and the first light transmittance was measured.

Example 3

A voltage of -40V is applied for a time of 1.6 seconds, and the pulse voltages having negative and positive voltages of -20V and +20V are repeated as many as 12 cycles for 1.4 seconds, and then the voltage is adjusted to 0V to control the optical path control member. The difference between the second light transmittance and the first light transmittance was measured in the same manner as in Example 1 except that the privacy mode was converted.

Example 4

A voltage of -40V is applied for a time of 1.6 seconds, and the pulse voltage having negative and positive voltages of -40V and +40V is repeated as many as 12 cycles for 1.4 seconds, and then the voltage is adjusted to 0V to control the optical path control member. The difference between the second light transmittance and the first light transmittance was measured in the same manner as in Example 1 except that the privacy mode was converted.

Example 5

The first light transmittance in the initial mode in which no voltage was applied was measured.

Then, pulse voltages having negative and positive voltages of -40V and +40 were applied to the optical path control member in the initial mode to which no voltage was applied.

At this time, the ratio of the application time of the negative voltage of -40V and the positive voltage of +40 was 7:1, and the pulse voltage was repeated at 4 cycles.

After repeating the pulse voltages having negative and positive voltages of -40V and +40V as many as 9 cycles for 1.1 seconds, the voltage was adjusted to 0V to convert the optical path control member into the privacy mode.

Then, the second light transmittance in privacy mode was measured.

Then, the difference between the second light transmittance and the first light transmittance was measured.

Example 6

The ratio of the application time of the negative voltage of -40V to the application time of the positive voltage of +40 was 8:1, and the pulse voltage was repeated 3 cycles, and the pulse voltage having negative and positive voltages of -40V and +40V. After repeating 9 cycles for 1.6 seconds, the second light transmittance and the first light transmittance were the same as in Example 5, except that the voltage was adjusted to 0V to convert the optical path control member into the privacy mode. The difference in transmittance was measured.

Example 7

The ratio of the application time of the negative voltage of -40V and the positive voltage of +40 was 9:1, and the pulse voltage was repeated 3 cycles, and the pulse voltage having negative and positive voltages of -40V and +40V. After repeating for 10 cycles for 1.4 seconds, the second light transmittance and the first light transmittance were the same as in Example 5, except that the voltage was adjusted to 0V to convert the light path control member into the privacy mode. The difference in transmittance was measured.

Comparative Example 1

The first light transmittance in the initial mode in which no voltage was applied was measured.

Then, a voltage of +40V was applied to the optical path controlling member in the initial mode to which no voltage was applied, thereby converting the optical path controlling member to the open mode.

Then, a voltage of -40V was applied for a time of 1.5 seconds to convert the optical path control member into the privacy mode.

Then, the second light transmittance in privacy mode was measured.

Then, the difference between the second light transmittance and the first light transmittance was measured.

Comparative Example 2

The difference between the second light transmittance and the first light transmittance was measured in the same manner as in Comparative Example 1, except that the light path control member was converted to the privacy mode by applying a voltage of -40V for a time of 1.6 seconds.

Light transmittance difference (%) Example 1 1.9 Example 2 1.9 Example 3 1.4 Example 4 1.4 Example 5 1.7 Example 6 0.93 Example 7 0.97 Comparative Example 1 4.61 Comparative Example 2 4.30

23 to 31 are diagrams illustrating a change in voltage and a flow of a pulse voltage according to Examples and Comparative Examples.

In detail, FIG. 23 shows Example 1, FIG. 24 shows Example 2, FIG. 25 shows Example 3, FIG. 26 shows Example 4, FIG. 27 shows Example 5, FIG. 28 shows Example 6, and FIG. 29 shows Example 7 , and FIG. 30 is a view for Comparative Example 1, and FIG. 31 is a view for Comparative Example 2. In addition, in FIGS. 23 to 31 , the X-axis represents time (seconds), and the Y-axis represents voltage (V).

Referring to Table 1, it can be seen that the difference between the second light transmittance and the first light transmittance of the light path controlling member according to the embodiments is smaller than that of the light path controlling member according to the comparative examples. That is, it can be seen that, in the light path control member according to the embodiments, the transmittance in the privacy mode is substantially similar to the light transmittance in the initial mode.

That is, the light path control member according to the embodiments uses a pulse voltage appropriately to make the dispersion of the light conversion particles uniform in a time within about 3 seconds when converting from the public mode to the privacy mode to achieve the primacy mode. light transmittance may be reduced.

That is, the light path control member according to the embodiment can control the difference in light transmittance between the privacy mode and the initial mode to 4% or less, specifically 3% or less, more specifically, 2% or less, more specifically, 1% or less. have.

In other words, the difference between the light transmittance in the initial mode and the light transmittance when converted to the privacy mode after conversion to the public mode is 4% or less, specifically 3% or less, more specifically, 2% or less, more specifically, , can be controlled to 1% or less.

That is, the optical path control member according to the embodiment may improve the driving speed and driving characteristics of the optical path control member by using the pulse voltage.

below. A display device and a display device to which the light path control member according to the embodiment is applied will be described with reference to FIGS. 32 to 36 .

32 and 33 , the light path control member 1000 according to the embodiment may be disposed on or under the display panel 2000 .

The display panel 2000 and the light path control member 1000 may be disposed to adhere to each other. For example, the display panel 2000 and the light path control member 1000 may be bonded to each other through an adhesive member 1500 . The adhesive member 1500 may be transparent. For example, the adhesive member 1500 may include an adhesive or an adhesive layer including an optically transparent adhesive material.

The adhesive member 1500 may include a release film. In detail, when the light path member and the display panel are adhered, the light path control member and the display panel may be adhered after the release film is removed.

Meanwhile, referring to FIGS. 32 and 33 , one end or one end and the other end of the light path control member may protrude, and the light conversion unit may not be disposed at the protruding portion. The protrusion region is an electrode connection portion to which the first electrode 210 and the second electrode 220 are exposed, and may connect an external printed circuit board and an optical path control member through the electrode connection portion.

The display panel 2000 may include a first' substrate 2100 and a second' substrate 2200 . When the display panel 2000 is a liquid crystal display panel, the light path control member may be formed under the liquid crystal panel. That is, when the user-viewed side of the liquid crystal panel is defined as the upper portion of the liquid crystal panel, the light path control member may be disposed below the liquid crystal panel. In the display panel 2000, a first substrate 2100 including a thin film transistor (TFT) and a pixel electrode and a second substrate 2200 including color filter layers are bonded to each other with a liquid crystal layer interposed therebetween. can be formed into a structured structure.

In addition, in the display panel 2000, a thin film transistor, a color filter, and a black electrolyte are formed on a first substrate 2100, and the second substrate 2200 has a liquid crystal layer interposed therebetween. It may be a liquid crystal display panel having a color filter on transistor (COT) structure that is bonded to the liquid crystal display panel. That is, a thin film transistor may be formed on the first substrate 2100 , a protective film may be formed on the thin film transistor, and a color filter layer may be formed on the protective film. Also, a pixel electrode in contact with the thin film transistor is formed on the first substrate 2100 . In this case, in order to improve the aperture ratio and simplify the mask process, the black electrolyte may be omitted, and the common electrode may also serve as the black electrolyte.

Also, when the display panel 2000 is a liquid crystal display panel, the display device may further include a backlight unit 3000 providing light from a rear surface of the display panel 2000 .

That is, as shown in FIG. 32 , the light path control member is disposed below the liquid crystal panel and above the backlight unit 3000 , and the light path control member is disposed between the backlight unit 3000 and the display panel 2000 . can be placed in

Alternatively, as shown in FIG. 33 , when the display panel 2000 is an organic light emitting diode panel, the light path control member may be formed on the organic light emitting diode panel. That is, when the surface viewed by the user of the organic light emitting diode panel is defined as the upper portion of the organic light emitting diode panel, the light path control member may be disposed on the organic light emitting diode panel. The display panel 2000 may include a self-luminous device that does not require a separate light source. In the display panel 2000 , a thin film transistor may be formed on a first substrate 2100 , and an organic light emitting diode contacting the thin film transistor may be formed. The organic light emitting device may include an anode, a cathode, and an organic light emitting layer formed between the anode and the cathode. In addition, a second 'substrate 2200 serving as an encapsulation substrate for encapsulation may be further included on the organic light emitting device.

That is, the light emitted from the display panel 2000 or the backlight unit 3000 may move from the second substrate 120 of the light path control member to the first substrate 110 .

Also, although not shown in the drawings, a polarizing plate may be further disposed between the light path control member 1000 and the display panel 2000 . The polarizing plate may be a linear polarizing plate or an external light reflection preventing polarizing plate. For example, when the display panel 2000 is a liquid crystal display panel, the polarizing plate may be a linear polarizing plate. Also, when the display panel 2000 is an organic light emitting diode panel, the polarizing plate may be an external light reflection preventing polarizing plate.

In addition, an additional functional layer 1300 such as an anti-reflection layer or anti-glare may be further disposed on the light path control member 1000 . In detail, the functional layer 1300 may be adhered to one surface of the first substrate 110 of the light path control member. Although not shown in the drawings, the functional layer 1300 may be bonded to the first substrate 110 of the light path control member through an adhesive layer. In addition, a release film for protecting the functional layer may be further disposed on the functional layer 1300 .

Also, a touch panel may be further disposed between the display panel and the light path control member.

Although the drawing illustrates that the light path control member is disposed on the display panel, the embodiment is not limited thereto, and the light control member is positioned at a position where light can be controlled, that is, a lower portion of the display panel or the display panel. It may be disposed in various positions, such as between the second substrate and the first substrate of the .

In addition, in the drawings, the light conversion unit of the light path control member according to the embodiment is shown in a direction parallel or perpendicular to the outer surface of the second substrate, but the light conversion unit is formed to be inclined at a predetermined angle from the outer surface of the second substrate. may be Accordingly, a moire phenomenon occurring between the display panel and the light path control member may be reduced.

34 to 36 , the light path control member according to the embodiment may be applied to various display devices.

34 to 36 , the light path control member according to the embodiment may be applied to a display device displaying a display.

For example, when power is applied to the light path controlling member as shown in FIG. 34 , the accommodating part functions as a light transmitting unit so that the display device can be driven in the open mode, and power is supplied to the light path controlling member as shown in FIG. 35 . When not applied, the receiving unit functions as a light blocking unit, so that the display device may be driven in a light blocking mode.

Accordingly, the user can easily drive the display apparatus in the privacy mode or the normal mode according to the application of power.

The light emitted from the backlight unit or the self-luminous device may move from the first substrate to the second substrate. Alternatively, the light emitted from the backlight unit or the self-luminous device may also move from the second substrate to the first substrate.

Also, referring to FIG. 36 , the display device to which the light path control member according to the embodiment is applied may also be applied to the interior of a vehicle.

For example, the display device including the light path control member according to the embodiment may display vehicle information and an image confirming a moving path of the vehicle. The display device may be disposed between a driver's seat and a passenger seat of the vehicle.

In addition, the light path control member according to the embodiment may be applied to an instrument panel that displays a vehicle speed, an engine, and a warning signal.

In addition, the light path control member according to the embodiment may be applied to the windshield FG or left and right window glass of a vehicle.

Features, structures, effects, etc. described in the above-described embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to one embodiment. Furthermore, features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are merely examples and do not limit the present invention, and those of ordinary skill in the art to which the present invention pertains are exemplified above in a range that does not depart from the essential characteristics of the present embodiment. It can be seen that various modifications and applications that have not been made are possible. For example, each component specifically shown in the embodiments may be implemented by modification. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (14)

a first substrate;
a first electrode disposed on the first substrate;
a second substrate disposed on the first substrate;
a second electrode disposed under the second substrate; and
and a light conversion unit disposed between the first electrode and the second electrode,
The light conversion part includes a partition wall part and a receiving part which are alternately arranged,
The accommodating part comprises a dispersion and light conversion particles dispersed in the dispersion,
The accommodating unit is driven in a public mode, a privacy mode depending on whether a voltage is applied,
When the privacy mode is converted to the public mode, a first voltage is applied,
When the public mode is converted to the privacy mode, a second voltage and a third voltage are applied,
At least one of the second voltage and the third voltage includes a pulse voltage. The method of claim 1,
the second voltage has a negative voltage,
The third voltage is an optical path control member having a pulse voltage in which a negative voltage and a positive voltage are continuously repeated. 3. The method of claim 2,
An optical path control member in which an application time of the negative voltage of the third voltage is longer than an application time of the positive voltage. 3. The method of claim 2,
The magnitude of the second voltage has a magnitude of 95% to 105% of the first voltage,
An optical path control member having magnitudes of a negative voltage and a positive voltage of the third voltage of 95% to 105% of the first voltage. 3. The method of claim 2,
The difference in magnitude between the negative voltage and the positive voltage of the third voltage is 95% to 105% of the difference in magnitude between the first voltage and the second voltage. The method of claim 1,
The second voltage and the third voltage have a pulse voltage in which a negative voltage and a positive voltage are repeated. 7. The method of claim 6,
The number of cycles of the third voltage is greater than the number of cycles of the second voltage. 7. The method of claim 6,
An optical path control member in which an application time of the negative voltage of the second voltage is longer than an application time of the positive voltage. 7. The method of claim 6,
An optical path control member in which an application time of the negative voltage of the third voltage is longer than an application time of the positive voltage. 7. The method of claim 6,
The second voltage is an optical path control member to which a positive voltage is applied after a negative voltage is applied. 7. The method of claim 6,
An optical path control member having magnitudes of negative and positive voltages of the second and third voltages of 95% to 105% of the first voltage. 7. The method of claim 6,
The difference in magnitude between the negative voltage and the positive voltage of the second voltage and the magnitude difference between the negative voltage and the positive voltage of the third voltage are 95% to 105% of the difference in magnitude between the first voltage and the second voltage. absence. a display panel including a light source; and
A display device disposed on the display panel and comprising the light path control member of any one of claims 1 to 12. 14. The method of claim 13,
The light emitted from the light source passes through the light path control member,
The difference between the light transmittance in the initial mode and the light transmittance when converted to the privacy mode after conversion to the public mode is 4% or less.

Images