Light route control member and display having the same

Abstract

A light path control member according to an embodiment comprises: a first substrate; a first electrode disposed on the first substrate; a light conversion member disposed on the first electrode; a second substrate disposed on the first substrate; a second electrode disposed below the second substrate; and an adhesive layer disposed between the light conversion member and the second electrode, wherein the light conversion member includes a partition member and a receiving member that are alternately disposed, the receiving member has a light transmittance that changes according to the application of voltage, the receiving member receives a light conversion particle and a dispersion liquid, the light conversion particle includes carbon black, and the dispersion liquid includes an additive and a dispersant.

Description

Technology Field

[0001] The embodiment relates to an optical path control member and a display device including the same. Background Technology

[0002] Light-blocking films block the transmission of light from a light source and are attached to the front of display panels, which are display devices used in mobile phones, laptops, tablet PCs, in-car navigation systems, and automotive touch screens. They are used to adjust the viewing angle of light according to the angle of incidence when the display emits an image, thereby enabling the user to see clear image quality at the required viewing angle.

[0003] In addition, light-blocking films can be used on windows of vehicles or buildings to partially block external light to prevent glare or to block visibility from the outside to the inside.

[0004] That is, the light-blocking film may be a light path control member that controls the path of light to block light in a specific direction and transmit light in a specific direction. Accordingly, the light transmission angle can be controlled by the light-blocking film, thereby controlling the user's viewing angle.

[0005] Meanwhile, such light-blocking films can be classified into light-blocking films that can always control the viewing angle regardless of the surrounding environment or the user's environment, and switchable light-blocking films that allow the user to turn the viewing angle control on and off depending on the surrounding environment or the user's environment.

[0006] Such a switchable light-blocking film can be implemented by filling the pattern portion with particles that can move according to the application of voltage and a dispersion liquid that disperses them, so that the pattern portion changes into a light-transmitting portion and a light-blocking portion through the dispersion and aggregation of particles.

[0007] Switchable light-blocking films have a problem with low lateral transmittance in share mode.

[0008] Therefore, a new optical path control member with a structure capable of solving the above-mentioned problems is required. The problem to be solved

[0009] The embodiment may provide an optical path control member with improved optical properties. Specifically, the embodiment may provide an optical path control member with improved lateral transmittance in a share mode. Accordingly, the embodiment may improve the driving performance of the optical path control member and the display device including the same. means of solving the problem

[0010] A light path control member according to an embodiment comprises: a first substrate; a first electrode disposed on the first substrate; a light conversion member disposed on the first electrode; a second substrate disposed on the first substrate; a second electrode disposed below the second substrate; and an adhesive layer disposed between the light conversion member and the second electrode, wherein the light conversion member includes a partition member and a receiving member that are alternately disposed, the receiving member has a light transmittance that changes according to the application of voltage, the receiving member receives a light conversion particle and a dispersion liquid, the light conversion particle includes carbon black, and the dispersion liquid includes an additive and a dispersant.

[0011] A display device according to an embodiment includes a display panel; and a light path control member disposed on the display panel, wherein the light path control member includes a first substrate; a first electrode disposed on the first substrate; a light conversion unit disposed on the first electrode; a second substrate disposed on the first substrate; a second electrode disposed below the second substrate; and an adhesive layer disposed between the light conversion unit and the second electrode, wherein the light conversion unit includes a partition and a receiving unit disposed alternately, wherein the light transmittance of the receiving unit changes according to the application of voltage, and the receiving unit receives a light conversion particle and a dispersion liquid, wherein the light conversion particle includes carbon black, and the dispersion liquid includes an additive and a dispersant. Effects of the invention

[0012] The receiving portion of the light path control member according to the embodiment is filled with light-converting particles and a dispersion liquid, which are light-converting materials, and the dispersion liquid may include additives and a dispersant.

[0013] At this time, since the above additive and dispersant can form micelles, the dispersion power of the photoconversion particles within the photoconversion material can be improved.

[0014] Accordingly, the optical characteristics and driving speed of the optical path control member and the display device including it can be improved. Brief explanation of the drawing

[0015] FIGS. 1 and FIGS. 2 are perspective views of an optical path control member according to an embodiment. FIGS. 3 and FIGS. 4 are perspective views illustrating the first substrate and first electrode and the second substrate and second electrode of an optical path control member according to an embodiment, respectively. Figure 5 is a cross-sectional view of the AA' region of Figure 1. Figure 6a is a diagram showing an example of the principle of an additive adhering to the surface of a partition within a dispersion. Figure 6b shows a schematic diagram of the dispersion of carbon black and micelle formation. In Fig. 6c, a shows the head and tail portions according to the type of dispersant, and b shows an example of a dispersant. Figure 6d shows examples of micelle forms of nonionic dispersants and anionic dispersants. FIGS. 7 to 10 are cross-sectional views of the AA' region of FIG. 1, cut to explain various receiving portion shapes in an optical path control member according to an embodiment. FIGS. 11 to 17 are drawings for explaining a method of manufacturing an optical path control member according to an embodiment. FIG. 18 is a cross-sectional view of a display device to which an optical path control member according to an embodiment is applied. FIGS. 19 to 21 are drawings for explaining an embodiment of a display device to which an optical path control member according to an embodiment is applied. Specific details for implementing the invention

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0017] In addition, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0018] Furthermore, 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 include the plural form unless specifically stated otherwise in the text, and when described as “A and at least one of B and C (or more than one),” it may include one or more of all combinations that can be formed from A, B, and C.

[0019] In addition, terms such as first, second, A, B, (a), (b), etc., may be used when describing the components of the embodiments of the present invention. These terms are used merely to distinguish the components from other components and are not intended to limit the essence, order, or sequence of the components.

[0020] And, where it is stated that a component is 'connected', 'combined', or 'joined' to another component, this may include not only cases where the component is directly connected, combined, or joined to the other component, but also cases where it is 'connected', 'combined', or 'joined' due to another component located between the component and the other component.

[0021] Additionally, where described as being formed or placed on the "top or bottom" of each component, the top or bottom includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components.

[0022] In addition, when expressed as “up” or “down,” it can include the meaning of a downward direction as well as an upward direction relative to a single component.

[0024] 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 is a switchable optical path control member that operates in various modes depending on electrophoretic particles that move by the application of voltage.

[0026] Referring to FIGS. 1 to 4, the optical path control member according to the embodiment may include a first substrate (110), a second substrate (120), a first electrode (210), a second electrode (220), and an optical conversion unit (300).

[0027] The first substrate (110) can support the first electrode (210). The first substrate (110) can be rigid or flexible.

[0028] Additionally, the first substrate (110) may be transparent. For example, the first substrate (110) may include a transparent substrate that can transmit light.

[0029] The first substrate (110) may include glass, plastic, or a flexible polymer film. For example, the flexible polymer film may be made of any one of polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES), cyclic olefin copolymer (COC), triacetylcellulose (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, or polystyrene (PS), and this is merely one example and is not necessarily limited thereto.

[0030] In addition, the first substrate (110) may be a flexible substrate having flexible properties.

[0031] Additionally, 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. As a result, the optical path control member according to the embodiment may be changed to various designs.

[0032] The first substrate (110) can be extended in a first direction (1A), a second direction (2A), and a third direction (3A).

[0033] Specifically, the first substrate (110) may include a first direction (1A) corresponding to the length or width direction of the first substrate (110), a second direction (2A) extending in a direction different from the first direction (1A) and corresponding to the length or width direction of the first substrate (110), and a third direction (3A) extending in a direction different from the first direction (1A) and the second direction (2A) and corresponding to the thickness direction of the first substrate (110).

[0034] For example, the first direction (1A) may be defined as the length direction of the first substrate (110), the second direction (2A) may be defined as the width direction of the first substrate (110) perpendicular to the first direction (1A), and the third direction (3A) may be defined as the thickness direction of the first substrate (110). Alternatively, the first direction (1A) may be defined as the width direction of the first substrate (110), the second direction (2A) may be defined as the length direction of the first substrate (110) perpendicular to the first direction (1A), and the third direction (3A) may be defined as the thickness direction of the first substrate (110).

[0035] Hereinafter, for convenience of explanation, the first direction (1A) is described as the length direction of the first substrate (110), the second direction (2A) as the width direction of the first substrate (110), and the third direction (3A) as the thickness direction of the first substrate (110).

[0037] The first electrode (210) may be disposed on one side of the first substrate (110). Specifically, 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).

[0038] 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 a metal oxide such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, etc.

[0039] The first electrode (210) may have a thickness of about 10 nm to about 50 nm.

[0040] Alternatively, the first electrode (210) may include various metals to achieve low resistance. For example, the first electrode (210) may include at least one metal selected from chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), titanium (Ti), and alloys thereof.

[0042] Referring to FIG. 3, the first electrode (210) may be disposed on the front surface of one side of the first substrate (110). Specifically, the first electrode (210) may be disposed as a surface electrode on one side of the first substrate (110). However, the embodiment is not limited thereto, and the first electrode (210) may be formed as a plurality of pattern electrodes having a certain pattern, such as a mesh or stripe shape.

[0043] For example, the first electrode (210) may include a plurality of conductive patterns. Specifically, the first electrode (210) may include a plurality of mesh lines intersecting each other and a plurality of mesh openings formed by the mesh lines.

[0044] Accordingly, even if the first electrode (210) includes metal, the first electrode is not visible from the outside, so visibility can be improved. In addition, light transmittance is increased by the openings, so the brightness of the light path control member according to the embodiment can be improved.

[0046] The second substrate (120) may be placed on the first substrate (110). Specifically, the second substrate (120) may be placed on the first electrode (210) on the first substrate (110).

[0047] 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 a material identical or similar to the first substrate (110) described above.

[0048] For example, the second substrate (120) may include glass, plastic, or a flexible polymer film. For example, a flexible polymer film may be made of any one of polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES), cyclic olefin copolymer (COC), triacetylcellulose (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, or polystyrene (PS), and this is just one example and is not necessarily limited thereto.

[0049] In addition, the second substrate (120) may be a flexible substrate having flexible properties.

[0050] Additionally, 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. As a result, the optical path control member according to the embodiment may be changed to various designs.

[0051] The second substrate (120) can also be extended in the same way as the first substrate (110) described above in the first direction (1A), the second direction (2A), and the third direction (3A).

[0052] Specifically, the second substrate (120) may include a first direction (1A) corresponding to the length or width direction of the second substrate (120), a second direction (2A) extending in a direction different from the first direction (1A) and corresponding to the length or width direction of the second substrate (120), and a third direction (3A) extending in a direction different from the first direction (1A) and the second direction (2A) and corresponding to the thickness direction of the second substrate (120).

[0053] For example, the first direction (1A) may be defined as the length direction of the second substrate (120), the second direction (2A) may be defined as the width direction of the second substrate (120) perpendicular to the first direction (1A), and the third direction (3A) may be defined as the thickness direction of the second substrate (120).

[0054] Alternatively, the first direction (1A) may be defined as the width direction of the second substrate (120), the second direction (2A) may be defined as the length direction of the second substrate (120) perpendicular to the first direction (1A), and the third direction (3A) may be defined as the thickness direction of the second substrate (120).

[0055] Hereinafter, for convenience of explanation, the first direction (1A) is described as the length direction of the second substrate (120), the second direction (2A) as the width direction of the second substrate (120), and the third direction (3A) as the thickness direction of the second substrate (120).

[0057] The second electrode (220) may be disposed on one side of the second substrate (120). Specifically, 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 the surface facing the second substrate (120) and the first substrate (110). That is, the second electrode (220) may be disposed facing 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).

[0058] The second electrode (220) may include a material identical or similar to the first electrode (210) described above.

[0059] 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 a metal oxide such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, etc.

[0060] The second electrode (220) may have a thickness of about 10 nm to about 50 nm.

[0061] Alternatively, the second electrode (220) may include various metals to achieve low resistance. For example, the second electrode (220) may include at least one metal selected from chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), titanium (Ti), and alloys thereof.

[0063] Referring to FIG. 4, the second electrode (220) may be disposed on the front surface of one side of the second substrate (120). Specifically, the second electrode (220) may be disposed as a surface electrode on one side of the second substrate (120). However, the embodiment is not limited thereto, and the second electrode (220) may be formed as a plurality of pattern electrodes having a certain pattern, such as a mesh or stripe shape.

[0064] For example, the second electrode (220) may include a plurality of conductive patterns. Specifically, the second electrode (220) may include a plurality of mesh lines intersecting each other and a plurality of mesh openings formed by the mesh lines.

[0065] Accordingly, even if the second electrode (220) includes metal, the second electrode is not visible from the outside, so visibility can be improved. In addition, light transmittance is increased by the openings, so the brightness of the light path control member according to the embodiment can be improved.

[0067] The first substrate (110) and the second substrate (120) may have corresponding sizes. The first substrate (110) and the second substrate (120) may have the same or similar sizes.

[0068] Specifically, the first length extending in the first direction (1A) of the first substrate (110) may have the same or similar size as the second length (L2) extending in the first direction (1A) of the second substrate (120).

[0069] For example, the first length and the second length may have a size of 300 mm to 400 mm.

[0070] In addition, the first width extending in the second direction (2A) of the first substrate (110) and the second width extending in the second direction of the second substrate (120) may have the same or similar size.

[0071] For example, the first width and the second width may have a size of 150 mm to 200 mm.

[0072] Additionally, the first thickness extending in the third direction (3A) of the first substrate (110) may have a size that is the same as or similar to the second thickness extending in the third direction of the second substrate (120).

[0073] For example, the first thickness and the second thickness may have a size of 1 mm or less.

[0075] Referring to FIG. 1, the first substrate (110) and the second substrate (120) may be arranged in an alternating manner.

[0076] In detail, the first substrate (110) and the second substrate (120) may be positioned at positions that are staggered from each other in the first direction (1A). In detail, the first substrate (110) and the second substrate (120) may be positioned such that the sides of the substrates are staggered from each other.

[0077] Accordingly, the first substrate (110) may be positioned protruding in one direction of the first direction (1A), and the second substrate (120) may be positioned protruding in the other direction of the first direction (1A).

[0078] That is, the first substrate (110) may include a first protrusion protruding in one direction of the first direction (1A), and the second substrate may include a second protrusion protruding in the other direction of the first direction (1A).

[0079] Accordingly, the optical path control member (1000) may include an area where the first electrode (210) is exposed on the first substrate (110) and an area where the second electrode (220) is exposed on the lower part of the second substrate (120).

[0080] That is, the first electrode (210) disposed on the first substrate (110) may be exposed at the first protrusion, and the second electrode (220) disposed on the lower part of the second substrate (120) may be exposed at the second protrusion.

[0081] The first electrode (210) and the second electrode (220) exposed at the above protrusions can be connected to an external printed circuit board through a pad portion, etc., described below.

[0083] Alternatively, referring to FIG. 2, the first substrate (110) and the second substrate (120) may be positioned at corresponding locations. Specifically, the first substrate (110) and the second substrate (120) may be positioned such that their respective sides correspond to each other.

[0084] Accordingly, the first substrate (110) may be positioned protruding in one direction of the first direction (1A), and the second substrate (120) may also be positioned protruding in one direction of the first direction (1A), that is, in the same direction as the first substrate (110).

[0085] That is, the first substrate (110) may include a first protrusion protruding in one direction of the first direction (1A), and the second substrate may also include a second protrusion protruding in one direction of the first direction (1A).

[0086] That is, the first protrusion and the second protrusion may protrude in the same direction.

[0087] Accordingly, the optical path control member (1000) may include an area where the first electrode (210) is exposed on the first substrate (110) and an area where the second electrode (220) is exposed on the lower part of the second substrate (120).

[0088] That is, the first electrode (210) disposed on the first substrate (110) may be exposed at the first protrusion, and the second electrode (220) disposed on the lower part of the second substrate (120) may be exposed at the second protrusion.

[0089] The first electrode (210) and the second electrode (220) exposed at the above protrusions can be connected to an external printed circuit board through a connection part, etc., described below.

[0091] The light conversion unit (300) may be disposed between the first substrate (110) and the second substrate (120). Specifically, the light conversion unit (300) may be disposed between the first electrode (210) and the second electrode (220).

[0092] An adhesive layer or a buffer layer may be disposed between at least one of the light conversion unit (300) and the first substrate (110) or between the light conversion unit (300) and the second substrate (120), and the first substrate (110), the second substrate (120), and the light conversion unit (300) may be bonded by the adhesive layer and / or the buffer layer.

[0093] The light conversion unit (300) may include a plurality of partitions and receiving units. Light conversion particles that move according to the application of voltage may be disposed in the receiving units, and the light transmission characteristics of the light path control member may be changed by the light conversion particles.

[0094] The size of the light conversion unit (300) may be smaller than the size of at least one of the first substrate (110) and the second substrate (120).

[0095] Specifically, the length of the first direction of the light conversion unit (300) may be smaller than the length of the first direction of at least one of the first substrate (110) and the second substrate (120).

[0096] Additionally, the width in the second direction of the light conversion unit (300) may be equal to or smaller than the width in the second direction of at least one of the first substrate (110) and the second substrate (120).

[0097] Additionally, at least one of the two ends of the first direction of the first substrate (110) and the second substrate (120) may be positioned outside the two ends of the first direction of the light conversion unit (300).

[0098] Accordingly, a sealing portion (not shown in the drawing) can be easily positioned, and the adhesive properties of the sealing portion can be improved.

[0100] Referring to FIG. 5, the improvement in the driving speed of the optical path control member according to the embodiment is explained.

[0101] The light path control member according to the embodiment may include a light-changing material. For example, the light-changing material (320') may be EPD ink. A light-converting unit (300) may be used to accommodate such a light-converting material (320') and prevent overflow. The light-converting unit (300) may include a receiving unit (320) for accommodating the light-converting material (320') and a partition unit (310) for preventing overflow of the light-converting material (320').

[0102] The light conversion part (300) may be formed of a resin. For example, the light conversion part (300) may be formed of a photocurable resin. For example, the light conversion part (300) may be formed by imprinting a photocurable resin. That is, the partition part (310) and the receiving part (320) may be formed of a photocurable resin.

[0103] The above partition (310) may include a resin material. For example, the above partition (310) may include a thermosetting resin. For example, the above partition (310) may include a photosetting resin material. As an example, the above partition (310) may include urethane resin, etc.

[0104] The above photocurable resin may include urethane acrylate, acrylate monomer, isobornyl acrylate, additives, a photoinitiator, and acryloylmorpholine. For example, the photoinitiator may include 1-Hydroxycyclohexyl phenylmethanone.

[0105] The above photocurable resin may comprise an oligomer, a monomer, and a photopolymerization initiator. Alternatively, the above photocurable resin may comprise an oligomer, a monomer, a photopolymerization initiator, and an additive. The photocurable resin may form a light-converting portion by the reaction of a polymer-type prepolymer, a polyfunctional monomer acting as a diluent, and a photopolymerization initiator. Here, the additive may refer to various substances including at least one of an antistatic agent and an additive.

[0106] In the case where an additive is included in the resin to form the above partition (310), the additive may move over the surface of the resin, which may cause the optical properties of the resin to deteriorate over time and the adhesive strength between the resin and the adhesive layer to decrease.

[0107] Accordingly, the resin composition for forming the above partition (310) may not contain additives. As a result, additives may not be present on the surface of the above partition, thereby improving the adhesion performance between the above partition and the adhesive layer. Additionally, the above partition may not contain additives, thereby improving optical properties.

[0108] Alternatively, the resin composition for forming the partition (310) may contain a small amount of additive. For example, the resin composition for forming the partition (310) may contain 3 weight % or less of the additive when the total resin composition is 100 weight %. For example, the resin composition for forming the partition (310) may contain 2 weight % or less of the additive when the total resin composition is 100 weight %. For example, the resin composition for forming the partition (310) may contain 1 weight % or less of the additive when the total resin composition is 100 weight %. For example, the resin composition for forming the partition (310) may contain 0.5 weight % or less of the additive when the total resin composition is 100 weight %. Accordingly, even when the additive is included within the partition, the problem of reduced adhesion or reduced optical properties due to the additive migrating to the surface can be minimized.

[0110] Referring to FIG. 6, the improvement in the lateral transmittance of the device due to the inclusion of a non-reactive additive in the EPD ink of the example is explained.

[0111] The above light-converting material (320') may include light-converting particles and a dispersion.

[0112] The above light-converting particles may include carbon black.

[0113] The above dispersion may include additives and dispersants. That is, the embodiment can improve the driving performance of the device by including a non-reactive additive in the EPD ink.

[0114] With reference to FIGS. 6a to 6d, the effects of mixing EPD ink and a non-reactive additive will be explained in detail below.

[0115] Figure 6a is a diagram showing an example of the principle of an additive adhering to the surface of a partition within a dispersion.

[0116] The non-reactive additive may contain -Si- bonds. For example, the non-reactive additive may include a PDMS backbone and may contain repeating -Si-O-Si- bonds.

[0117] In the presence of a small amount of water molecules in the solvent, silane groups can be converted into Si-OH groups, creating a hydrophobic surface. For example, the Si-X bonds of non-reactive additives contained in a dispersion can react with water molecules to change into Si-OH bonds.

[0118] Polymer aggregates and other microstructures may be located around Si-OH.

[0119] At this time, X is shown as Cl in FIG. 6a, but the examples are not limited thereto and may include various functional groups. For example, in the Si-X bond included in the non-reactive additive, X can include various functional groups such as halogen groups like F and CH3, alkyl groups, alkoxy groups, hydroxyl groups, alkenyl groups, aryl groups, etc.

[0120] Meanwhile, the non-reactive additive may include Si-OH bonds. For example, if the functional group attached to PDMS is an alkoxy group or a hydroxyl group, the non-reactive additive may include Si-OH bonds.

[0121] For example, a monolayer of the silane surface can be formed on the barrier due to cross-linking and surface attachment between silane groups. In other words, micelles can be formed as a monolayer. If a small amount of water molecules are present in the solvent, the silane groups hydrolyze into Si-OH, creating an overall hydrophobic surface.

[0122] The micelles may have a thickness of 1 nm to 500 nm. For example, the micelles may have a thickness of 1 nm to 300 nm. For example, the micelles may have a thickness of 1 nm to 500 nm. Unlike the core-shell, the micelles may have a thickness of less than 1 µm.

[0123] For example, the non-reactive additive contains -O-Si- bonds, and the oxygen element in the -O-Si- bond can form a chemical bond with a component of the barrier. For example, the oxygen contained in the non-reactive additive can form a covalent bond with an element on the barrier.

[0125] Figure 6b shows a schematic diagram of the dispersion of carbon black and micelle formation.

[0126] If the amount of dispersant in the above-mentioned light-converting material (320') is large, more dispersants may attach to the surroundings of the carbon black and form micelles. Consequently, this causes a problem in that it reduces the charge of the carbon black and causes a decrease in the movement speed.

[0127] Accordingly, the embodiment can improve the driving performance of the device by mixing the EPD ink with a non-reactive additive. Specifically, when the silane component of the non-reactive additive moves to the surface of the barrier, it can reduce its distribution in the solvent by forming micelles with the dispersant within the EPD ink.

[0128] Accordingly, the movement of carbon black particles within the light-converting material can be facilitated. That is, the movement of carbon black particles within the light-converting material can be not restricted by the dispersant, thereby improving the lateral transmittance in shear mode.

[0129] The above dispersion may include micelles formed by the reaction of the dispersant and the silane component of the additive.

[0130] The embodiments may include various types of micelles. Here, the first, second, and third may be for distinguishing micelles of different types.

[0131] The first micelle can encapsulate carbon black within the dispersion. For example, the first micelle may be in the form of encapsulating carbon black particles within the dispersion. Specifically, the first micelle may encapsulate a single carbon black particle within the dispersion. Alternatively, the first micelle may encapsulate two or more carbon black particles within the dispersion. An anionic material may be located on the surface of the first micelle.

[0132] Accordingly, the dispersion may contain a plurality of carbon black particles, and each of the plurality of carbon black particles may be encapsulated by a first micelle. Thus, the plurality of carbon black particles in the dispersion may be dispersed by the first micelle.

[0133] The second micelle can encapsulate ions within the dispersion. For example, the second micelle may encapsulate cationic substances present within the dispersion.

[0134] The first micelle can stabilize anions. Meanwhile, the second micelle can stabilize cations. That is, ions with different polarities can be stabilized in the dispersion by different micelles.

[0135] The third micelle may adhere to the surface of the barrier within the dispersion. Specifically, the silane component of the non-reactive additive in the EPD ink may migrate to the surface of the barrier. Accordingly, the -O-Si- component of the non-reactive additive may bind to the barrier, such as a silane surface coating. The dispersant in the EPD ink may form micelles with the silane component of the non-reactive additive. Consequently, the stacking density of carbon black particles in shear mode may be improved, thereby improving the lateral transmittance of the device.

[0136] In addition, micelles are formed between dispersant molecules that are present in excess in the EPD ink, and since these micelles between dispersant molecules form micelles with silane, the distribution of the dispersant in the EPD ink may be reduced.

[0138] The non-reactive additive of the example can form micelles with various types of dispersants. For example, the -Si- elemental portion of the non-reactive additive of the example can form micelles with various types of dispersants. Specifically, the dispersant can form micelles on its own regardless of the type, composition, length, molecular weight, functional group, etc. The micelles formed by the dispersant can have a head portion and a tail portion. For example, if the head portion is located inside the micelle, the tail portion may be located outside the micelle. For example, if the tail portion is located inside the micelle, the head portion may be located outside the micelle.

[0139] For example, micelles can be formed as the head portion of the dispersant attaches to the -Si- periphery of the non-reactive additive. For example, micelles can be formed as the head portion of the dispersant attaches to the -Si-O- periphery of the non-reactive additive. For example, micelles can be formed as the head portion of the dispersant attaches to the -Si-CH3 periphery of the non-reactive additive.

[0140] With reference to FIGS. 6c and FIGS. 6d, the dispersant is described in detail.

[0141] With reference to Fig. 6c, the structure and type of dispersant are explained.

[0142] In the examples, the dispersant may refer to various types of dispersants. For example, the dispersant may be at least one of a nonionic dispersant, a cationic dispersant, an anionic dispersant, and an amphoteric (zwitterionic) dispersant. Here, the nonionic, cationic, anionic, and amphoteric nature of the dispersant can be distinguished through the polarity of the head portion.

[0143] A single compound constituting the dispersant may include both a hydrophilic part and a hydrophobic part. Here, the head of the dispersant may refer to the hydrophilic part of the dispersant. Here, the tail of the dispersant may refer to the hydrophobic part of the dispersant.

[0144] For example, the dispersant may be any one of Triton X-100, CTAB, AOT, and phosphatidylcholine. Of course, the dispersant of the example is not limited to these and may be various types of substances.

[0145] Figure 6d is a diagram showing the micelle form of the dispersant itself.

[0146] For example, in a nonionic dispersant, the tail portion may be located inside the micelle and the head portion may be located outside the micelle. In this case, the head portion may exhibit nonionic properties. For example, in an anionic dispersant, the tail portion may be located inside the micelle and the head portion may be located outside the micelle. In this case, the head portion may exhibit anionic properties.

[0148] In the example, the carbon black particles in the EPD ink may not be hindered by the reduction of charge by the dispersant, so the movement speed may be fast. Accordingly, the example can improve the delivery speed of the device.

[0149] Referring to Table 1, the results of the evaluation of driving characteristics according to the content of non-reactive additives in the EPD ink are explained.

[0150] Here, the standard for the content of non-reactive additives refers to the content of additives relative to the weight of the EPD ink excluding additives when it is 100%.

[0152] Types of non-reactive additives may include fluids (oils), gums, resins, and elastomers.

[0153] The above fluid may be a linear polymer. For example, the fluid may be a Si-containing material such as polydimethylsiloxane (PDMS). Alternatively, the fluid may be a functional fluid. Here, the functional fluid may include a material in which a functional group is bonded to polydimethylsiloxane.

[0154] The above non-reactive additive may include a material in which one or more functional groups are bonded to polydimethylsiloxane. The above non-reactive additive may include a material in which two or more identical or different functional groups are bonded to polydimethylsiloxane.

[0155] The above-mentioned non-reactive additive may be a functional fluid in which a functional group is bonded to polydimethylsiloxane. Specifically, the functional group bonded to the backbone of polydimethylsiloxane may include various substances such as alkyl groups, aryl groups, allyl groups, alkenyl groups, amido groups, amino groups, fluoroalkyl groups, halide groups, epoxy groups, carboxyl groups, hydroxyl groups, alkoxy groups, and methylhydrogen. In addition, the Si-containing copolymer may include siloxane-urethane copolymer, siloxane-polycarbonate copolymer, siloxane-polyester copolymer, siloxane-polyimide copolymer, acryloxymethylsiloxane, p-styrylsiloxane, copolymer of silicone and aldehyde, polysilformal, etc.

[0156] Non-reactive additives in the form of functional groups attached to polydimethylsiloxane may be organically modified linear polydimethylsiloxane backbones.

[0157] The above black ultrapolymer may refer to a linear polymer.

[0158] The above resin is a polymer with a three-dimensional siloxane structure, which may mean having three reactive groups.

[0159] The above elastomer may be in a state where silane / siloxane is cross-linked to form a network.

[0160] division Comparative example Example 1 Example 2 Example 3 Sample A-1 A-2 A-3 B-1 B-2 C-1 C-2 C-3 Non-reactive additives - 0.3 0.5 1 0.3 0.5 0.3 0.5 1.5 Device side transmittance (share mode) 4.4% 33.1% 42.3% 46.2% 36.0% 45.1% 39.2% 41.8% 45.9%

[0161] The comparative example is a photocurable resin that does not contain non-reactive additives. Here, a polyurethane-based material was used for the photocurable resin.

[0162] Example 1 is PDMS with an alkyl functional group attached.

[0163] Example 2 is PDMS with fluoroalkayl functional groups attached.

[0164] Example 3 is a siloxane-urethane copolymer.

[0166] In Examples 1 to 3, the non-reactive additive is included in an amount of 0.1% to 20% by weight based on 100% by weight of the dispersion, so that the lateral transmittance of the device measured in the shear mode is 30% or more.

[0167] For example, the example may contain 0.1% to 10% by weight of the non-reactive additive based on 100% by weight of the dispersion, so that the lateral transmittance of the device measured in the shear mode is 30% or more.

[0168] For example, the example may contain 0.1% to 5% by weight of the non-reactive additive based on 100% by weight of the dispersion, so that the lateral transmittance of the device measured in the shear mode is 30% or more.

[0170] The side transmittance of the device can be calculated as = (side brightness) * 100 / (side BLU value).

[0171] Here, the lateral transmittance is measured in share mode and may refer to the luminance value measured when the device is at 45 degrees. That is, the luminance value of the device at the 45-degree position was measured by the measuring instrument.

[0173] That is, the present invention may include a non-reactive additive in the EPD ink to improve the driving speed of the device. Accordingly, the dispersibility between carbon black particles in the EPD ink may be improved. In addition, the driving speed may be improved due to the ease of movement of carbon black in the EPD ink. Furthermore, the lateral transmittance of the device in shear mode may be improved.

[0175] The details of the above light conversion unit (300) will be explained in detail below.

[0176] Referring to FIGS. 5, 7 to 10, the light conversion unit (300) may include a partition unit (310) and a receiving unit (320).

[0177] The above partition section (310) can be defined as a partition area that partitions the receiving section. That is, the above partition section (310) can transmit light as a partition area that partitions a plurality of receiving sections. In addition, the above receiving section (320) can be defined as an area that varies into a light blocking section and a light transmitting section depending on the application of voltage.

[0178] The above partition section (310) and the above receiving section (320) may be arranged alternately. The above partition section (310) and the above receiving section (320) may be arranged with different widths. For example, the width of the above partition section (310) may be greater than the width of the above receiving section (320).

[0179] The above partition section (310) and the above receiving section (320) can be arranged alternately. Specifically, the above partition section (310) and the above receiving section (320) can be arranged alternately. That is, each partition section (310) can be placed between adjacent receiving sections (320), and each receiving section (320) can be placed between adjacent partition sections (310).

[0180] The above partition (310) may include a transparent material. The above partition (310) may include a material capable of transmitting light.

[0181] The above partition (310) can transmit light incident on either the first substrate (110) or the second substrate (120) toward the other substrate.

[0182] The barrier portion of the embodiment may not contain additives. The non-reactive additive of the embodiment may be contained only within the EPD ink. Accordingly, a decrease in adhesion between the barrier portion and the adhesive layer due to the migration of the silane component to the surface of the barrier portion can be prevented. At the same time, the non-reactive additive of the embodiment forms micelles with a dispersant that reduces the charge of carbon black within the EPD ink, thereby controlling the amount and / or behavior of the dispersant and improving the driving performance of the device. Alternatively, the embodiment may include a minimal amount of additive in the barrier portion to mitigate performance degradation caused by the migration of the additive.

[0183] For example, in FIGS. 7 to 10, light can be emitted from the first substrate (110) by a light source placed below the first substrate (110) and incident in the direction of the second substrate (120). At this time, the partition (310) transmits the light, and the transmitted light can move in the direction of the second substrate (120).

[0184] The above-mentioned receiving portion (320) may include a dispersion (320a) and light-converting particles (320b). Specifically, the dispersion (320a) is injected into and filled into the receiving portion (320), and a plurality of light-converting particles (320b) may be dispersed within the dispersion (320a).

[0185] The dispersion (320a) may be a material that disperses the light-converting particles (320b). The dispersion (320a) may include a transparent material. The dispersion (320a) may include a non-polar solvent. Additionally, the dispersion (320a) may include a material capable of transmitting light. For example, the dispersion (320a) may include at least one material selected from halocarbon-based oil, paraffin-based oil, and isopropyl alcohol.

[0186] The light-converting particles (320b) may be dispersed and arranged within the dispersion (320a). Specifically, the plurality of light-converting particles (320b) may be spaced apart from each other within the dispersion (320a).

[0187] The light-converting particles (320b) may include a material capable of absorbing light. That is, the light-converting particles (320b) may be light-absorbing particles, and the light-converting particles (320b) may have a color. For example, the light-converting particles (320b) may have a black color. For example, the light-converting particles (320b) may include carbon black particles.

[0188] The light-converting particle (320b) may have a polarity by having a charged surface. For example, the surface of the light-converting particle (320b) may be charged with a negative (-) charge. Accordingly, depending on the application of voltage, the light-converting particle (320b) may move toward the first electrode (210) or the second electrode (220).

[0189] The light transmittance of the above-mentioned receiving portion (320) can be changed by the light-converting particles (320b). Specifically, the light transmittance of the above-mentioned receiving portion (320) can be changed by the light-converting particles (320b) to become a light-blocking portion and a light-transmitting portion. That is, the light transmittance passing through the above-mentioned receiving portion (320) can be changed by the dispersion and aggregation of the light-converting particles (320b) placed inside the dispersion liquid (320a).

[0190] For example, the optical path control member according to the embodiment may be changed from a first mode to a second mode or from a second mode to a first mode by the voltage applied to the first electrode (210) and the second electrode (220).

[0191] In detail, in the first mode, the receiving portion (320) of the light path control member according to the embodiment becomes a light blocking portion, and light at a specific angle can be blocked by the receiving portion (320). That is, the viewing angle of the user looking from the outside is narrowed, so the light path control member can be operated in a privacy mode.

[0192] In addition, in the second mode, the receiving portion (320) of the light path control member according to the embodiment becomes a light-transmitting portion, and light can be transmitted from both the partition portion (310) and the receiving portion (320) of the light path control member according to the embodiment. That is, the viewing angle of the user looking from the outside is widened, so the light path control member can be operated in an open mode.

[0193] The transition from the first mode to the second mode, that is, the conversion of the receiving portion (320) from a light-blocking portion to a light-transmitting portion, can be realized by the movement of the light-converting particles (320b) of the receiving portion (320). That is, the light-converting particles (320b) have a charge on their surface and, depending on the characteristics of the charge, can move toward the first electrode or the second electrode upon the application of voltage. That is, the light-converting particles (320b) may be electrophoretic particles.

[0194] Specifically, the receiving portion (320) can be electrically connected to the first electrode (210) and the second electrode (220).

[0195] At this time, when no voltage is applied to the light path control member from the outside, the light-converting particles (10) of the receiving portion (320) are uniformly dispersed within the dispersion liquid (320a), and accordingly, the receiving portion (320) can block light by the light-converting particles (320b). Accordingly, in the first mode, the receiving portion (320) can be driven as a light-blocking portion.

[0196] Alternatively, when a voltage is applied to the light path control member from the outside, the light-converting particle (320b) may be moved. For example, the light-converting particle (320b) may be moved toward one end or the other end of the receiving portion (320) by a voltage transmitted through the first electrode (210) and the second electrode (220). That is, the light-converting particle (10) may be moved toward the first electrode (210) or the second electrode (220).

[0197] Specifically, 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), and a light-converting particle (320b) that is negatively charged can be moved toward the positive electrode direction of the first electrode (210) and the second electrode (220) using the dispersion (320a) as a medium.

[0198] 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-converting particle (10) can be moved in the direction of the first electrode (210) within the dispersion (320a), that is, the light-converting particle (320b) is moved in one direction, and the receiving portion (320) can be driven into a light-transmitting portion.

[0199] Alternatively, when no voltage is applied to the first electrode (210) and / or the second electrode (220), as shown in FIG. 9, the light-converting particles (320b) are uniformly dispersed within the dispersion (320a), and the receiving portion (320) can be driven as a light-blocking portion.

[0200] Accordingly, the light path control member according to the embodiment can be driven in two modes depending on the user's surrounding environment. That is, if the user wants light transmission only at a specific viewing angle, the receiving part can be driven as a light blocking part, or, in an environment where the user requires a wide viewing angle and high brightness, the receiving part can be driven as a light transmitting part by applying voltage.

[0201] Accordingly, since the optical path control member according to the embodiment can be implemented in two modes according to the user's requirements, the optical path control member can be applied without being constrained by the user's environment, etc.

[0203] Meanwhile, the above-mentioned receiving portion may be arranged in a different shape, taking into account driving characteristics, etc.

[0204] Referring to FIGS. 7 and FIGS. 8, the optical path control member according to another embodiment may be positioned such that both ends of the receiving portion (320) are in contact with the buffer layer (410) and the adhesive layer (420), unlike FIG. 5.

[0205] For example, the lower part of the receiving portion (320) may be positioned in contact with the buffer layer (410), and the upper part of the receiving portion (320) may be positioned in contact with the adhesive layer (420).

[0206] Accordingly, the distance between the receiving portion (320) and the first electrode (210) is reduced so that the voltage applied from the first electrode (210) can be smoothly transmitted to the receiving portion (320).

[0207] Accordingly, the movement speed of the light-converting particles (320b) inside the receiving portion (320) can be improved, thereby improving the driving characteristics of the light path control member.

[0209] Additionally, referring to FIGS. 9 and 10, the optical path control member according to the embodiment may be arranged such that the receiving portion (320) has a constant inclination angle (θ), unlike FIGS. 8 and 9.

[0210] In detail, referring to FIGS. 9 and FIGS. 10, the receiving portion (320) may be positioned with respect to the first substrate (110) with an inclination angle (θ) greater than 0° and less than 90°. In detail, the receiving portion (320) may extend upward with respect to one surface of the first substrate (110) with an inclination angle (θ) greater than 0° and less than 90°.

[0211] Accordingly, when the light path control member is used together with a display panel, the moiré caused by the overlap between the pattern of the display panel and the receiving portion (320) of the light path control member can be mitigated, thereby improving the user's visibility.

[0213] Hereinafter, a method for manufacturing an optical path control member according to an embodiment will be described with reference to FIGS. 11 to 17.

[0214] Referring to FIG. 11, a first substrate (110) and an electrode material forming a first electrode are prepared. Subsequently, the first electrode can be formed by coating or depositing the electrode material on one surface of the first substrate. Specifically, the electrode material can be formed on the entire surface of the first substrate (110). Accordingly, a first electrode (210) formed as a surface electrode on the first substrate (110) can be formed.

[0215] Next, referring to FIG. 12, a resin layer (350) can be formed by applying a resin material onto the first electrode (210). Specifically, a resin layer (350) can be formed by applying a urethane resin or an acrylic resin onto the first electrode (210).

[0216] At this time, a buffer layer (410) may be additionally placed on the first electrode (210) before placing the resin layer (350). Specifically, the adhesion of the resin layer (350) can be improved by placing the buffer layer (410), which has good adhesion to the resin layer (350), on the first electrode (210), and then placing the resin layer (350) on the buffer layer (410).

[0217] For example, the buffer layer (410) may include an organic material that includes lipophilic groups such as -CH- and alkyl groups that have good adhesion to the electrode and hydrophilic groups such as -NH, -OH, and -COOH that have good adhesion to the resin layer (410).

[0218] The resin layer (350) may be disposed on a portion of the first substrate (110). That is, the resin layer (350) may be disposed over an area smaller than that of the first substrate (110). Accordingly, the resin layer (350) may not be disposed on the first substrate (110), thereby forming an area where the first electrode (210) is exposed. Additionally, when the buffer layer (410) is disposed on the first electrode (210), an area where the buffer layer (410) is exposed may be formed.

[0219] Specifically, the size of the third length extending in the first direction of the resin layer (350) may be less than the size of the first length extending in the first direction of the first substrate (110), and the size of the third width extending in the second direction of the resin layer (350) may be less than or equal to the size of the first width extending in the second direction of the first substrate (110).

[0220] That is, the length of the resin layer (350) is smaller than the length of the first substrate (110), and the width of the resin layer (350) may be the same as or smaller than the width of the first substrate (110).

[0222] Next, referring to FIG. 13, the resin layer (350) can be patterned to form a plurality of partition sections (310) and a plurality of receiving sections (320) in the resin layer (350). Specifically, an intaglio section can be formed in the resin layer (350) to form an intaglio-shaped receiving section (320) and a relief-shaped partition section (310) between the intaglio sections.

[0223] Accordingly, a light conversion unit (300) including the partition portion (310) and the receiving portion (320) may be formed on the first substrate (110).

[0224] In addition, the buffer layer (410) exposed on the first electrode (210) can be removed to expose the first electrode (210) to an area where the first substrate (110) protrudes.

[0226] Next, referring to FIG. 14, a second substrate (120) and an electrode material forming a second electrode are prepared. Then, the second electrode can be formed by coating or depositing the electrode material on one surface of the second substrate. Specifically, the electrode material can be formed on the entire surface of the second substrate (120). Accordingly, a second electrode (220) formed as a surface electrode on the second substrate (120) can be formed.

[0227] The second substrate (120) may be smaller than the size of the first substrate (110). Additionally, the second substrate (120) may be smaller than the size of the resin layer (350).

[0228] Specifically, the size of the second length extending in the first direction of the second substrate (120) may be larger than the third length extending in the first direction of the resin layer (350), and the size of the second width extending in the second direction of the second substrate (120) may be smaller than the size of the third width extending in the second direction of the resin layer (350).

[0230] Next, referring to FIG. 15, an adhesive layer (420) can be formed by applying an adhesive material onto the second electrode (220). Specifically, a light-transmitting adhesive layer capable of transmitting light can be formed on the second electrode (220). For example, the adhesive layer (420) may include an optical transparent adhesive layer (OCA).

[0231] The adhesive layer (420) may be placed on a portion of the light conversion unit (300). That is, the adhesive layer (420) may be placed over an area smaller than the light conversion unit (300). Accordingly, the adhesive layer (410) may not be placed on the light conversion unit (300), thereby forming an area where the light conversion unit (300) is exposed.

[0232] Specifically, the size of the fourth length extending in the first direction of the adhesive layer (420) may be larger than the size of the third length extending in the first direction of the light conversion unit (300), and the size of the fourth width extending in the second direction of the adhesive layer (420) may be smaller than the size of the third width extending in the second direction of the light conversion unit (300).

[0234] Next, referring to FIG. 16, the first substrate (110) and the second substrate (120) can be bonded together. Specifically, the second substrate (120) is placed on the light conversion unit (300), and the second substrate (120) and the light conversion unit (300) can be bonded together through the adhesive layer (420) placed on the lower part of the second substrate (120).

[0235] Accordingly, the first substrate (110), the light conversion unit (300), and the second substrate (120) can be sequentially stacked in the thickness direction of the first substrate (110), the light conversion unit (300), and the second substrate (120).

[0236] At this time, since the second substrate (120) is positioned smaller than the size of the resin layer (350), the light conversion unit (300) may have a plurality of partitions (310) and receiving units (320) exposed in an area where the second substrate (120) is not positioned.

[0237] Specifically, since the second width extending in the second direction of the second substrate (120) is smaller than the third width extending in the second direction of the resin layer (350), a plurality of partition portions (310) and receiving portions (320) may be exposed in at least one end region of the end facing the other end in the width direction of the resin layer (350).

[0238] Next, a light-converting material (380) can be injected between the receiving portions (320), that is, between the partition portions (310). Specifically, a light-converting material in which light-absorbing particles such as carbon black are dispersed in an electrolyte solvent containing a paraffinic solvent, etc., can be injected between the receiving portions (320), that is, between the partition portions.

[0239] For example, after placing a dam extending in the longitudinal direction of the light conversion unit (300) on the receiving portion and partition portion of the light conversion unit (300) where the second substrate (120) is not placed, an electrolyte solvent can be injected into the receiving portion (320) through a capillary injection method between the dam and the side of the light conversion unit (300).

[0241] Next, referring to FIG. 17, the light conversion unit (300) can be cut to manufacture a single light path control member. Specifically, the light conversion unit (300) can be cut along the longitudinal direction of the light conversion unit (300). That is, the light conversion unit (300), the buffer layer (410) below the light conversion unit (300), the first electrode (210), and the first substrate (110) can be cut along the dotted line shown in FIG. 22. A plurality of light path control members (A, B) can be formed by the cutting process, and FIG. 23 is a drawing showing one of the plurality of light path control members.

[0242] Specifically, the light conversion unit (300) can be cut so that the sides in the width direction of the first substrate (110), the second substrate (120), and the light conversion unit (300) can be arranged on the same plane.

[0243] Accordingly, the two ends of the second direction of the second substrate (120), the second electrode (220), or the adhesive layer (420) and the two ends of the second direction of the light conversion unit (300) can be arranged on the same plane.

[0244] That is, the two ends of the second direction of the adhesive layer (420) and the two ends of the second direction of the light conversion unit (300) can be connected to each other.

[0245] Alternatively, depending on the error during the process, the two ends of the second direction of the second substrate (120), the second electrode (220), or the adhesive layer (420) may be positioned further outward than the two ends of the second direction of the light conversion unit (300).

[0246] Subsequently, a buffer layer (410) and / or an adhesive layer (420) disposed on the upper surface of the first substrate (110) and the lower surface of the second substrate (120) can be partially removed to form a connection portion in which an electrode is exposed. Specifically, when a buffer layer (410) is disposed on a first electrode on the upper surface of the first substrate (110) where the light conversion unit (300) is not disposed, the first buffer layer (410) can be partially removed to expose the first electrode (210), or a first connection portion (211) can be formed on the first substrate (110) by not disposing of the buffer layer (410) on the first electrode where the light conversion unit (300) is not disposed from the beginning. Additionally, when an adhesive layer (420) is placed on a second electrode on the lower surface of the second substrate (120) where the light conversion unit (300) is not placed, a second connection unit (221) can be formed on the lower surface of the second substrate (120) by removing some of the adhesive layer (420) or by not placing the adhesive layer on the second electrode where the light conversion unit (300) is not placed during the adhesive process.

[0247] A printed circuit board or a flexible printed circuit board is connected to the above-mentioned connections through an anisotropic conductive film (ACF), etc., and the printed circuit board is connected to an external power source so that voltage can be applied to the optical path control member.

[0249] Hereinafter, with reference to FIGS. 18 to 21, a display device and a display device to which an optical path control member according to an embodiment is applied will be described.

[0250] Referring to FIG. 18, the optical path control member (1000) according to the embodiment can be placed on a display panel (2000).

[0251] The display panel (2000) and the light path control member (1000) may be arranged by adhering to each other. For example, the display panel (2000) and the light path control member (1000) may be adhered 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 comprising an optically transparent adhesive material.

[0252] The adhesive member (1500) may include a release film. Specifically, when bonding the light path control member and the display panel, the light path control member and the display panel can be bonded after removing the release film.

[0253] The above display panel (2000) may include a first substrate (2100) and a second substrate (2200). If the above display panel (2000) is a liquid crystal display panel, the above display panel (2000) may be formed in a structure in which 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 with a liquid crystal layer in between.

[0254] Additionally, the display panel (2000) may be a liquid crystal display panel with a COT (color filter on transistor) structure in which a thin film transistor, a color filter, and a black electrolyte (320a) are formed on a first substrate (2100), and a second substrate (2200) is bonded to the first substrate (2100) with a liquid crystal layer in between. 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. In addition, a pixel electrode in contact with the thin film transistor is formed on the first substrate (2100). At this time, in order to improve the aperture ratio and simplify the mask process, the black electrolyte may be omitted, and a common electrode may be formed to serve the role of the black electrolyte.

[0255] In addition, if the display panel (2000) is a liquid crystal display panel, the display device may further include a backlight unit that provides light from the back of the display panel (2000).

[0256] Alternatively, if the display panel (2000) is an organic electroluminescent display panel, the display panel (2000) may include a self-luminescent element that does not require a separate light source. The display panel (2000) may have a thin-film transistor formed on a first substrate (2100), and an organic light-emitting element formed in contact with the thin-film transistor. The organic light-emitting element may include an anode, a cathode, and an organic light-emitting layer formed between the anode and the cathode. Additionally, the display panel may further include a second substrate (2200) that serves as a sealing substrate for encapsulation on the organic light-emitting element.

[0257] Additionally, although not shown in the drawing, a polarizer may be further disposed between the light path control member (1000) and the display panel (2000). The polarizer may be a linear polarizer or an anti-external light reflection polarizer. For example, if the display panel (2000) is a liquid crystal display panel, the polarizer may be a linear polarizer. Additionally, if the display panel (2000) is an organic electroluminescent display panel, the polarizer may be an anti-external light reflection polarizer.

[0258] Additionally, an additional functional layer (1300), such as an anti-reflective layer or an anti-glare layer, may be further disposed on the light path control member (1000). Specifically, the functional layer (1300) may be adhered to one side of the base substrate (100) of the light path control member. Although not shown in the drawing, the functional layer (1300) may be adhered to the base substrate (100) of the light path control member through an adhesive layer. Additionally, a release film that protects the functional layer may be further disposed on the functional layer (1300).

[0260] In addition, a touch panel may be further disposed between the display panel and the light path control member.

[0261] Although the drawing illustrates the light path control member being positioned on the upper part of the display panel, the embodiment is not limited thereto, and the light control member may be positioned at various locations where light control is possible, such as the lower part of the display panel or between the second substrate and the first substrate of the display panel.

[0263] Referring to FIGS. 19 and 20, the optical path control member according to the embodiment can be applied to a vehicle.

[0264] Referring to FIGS. 19 and 20, the optical path control member according to the embodiment can be applied to a display device that displays a display.

[0265] For example, when power is not applied to the light path control member as in FIG. 19, the receiving part functions as a light blocking part, and the display device is driven in a light-blocking mode, and when power is applied to the light path control member as in FIG. 20, the receiving part functions as a light-transmitting part, and the display device can be driven in an open mode.

[0266] Accordingly, the user can easily operate the display device in privacy mode or normal mode depending on the application of power.

[0268] In addition, referring to FIG. 21, a display device to which an optical path control member according to an embodiment is applied can also be applied to the interior of a vehicle.

[0269] For example, a display device including a light path control member according to an embodiment can display information about the vehicle and an image confirming the vehicle's movement path. The display device may be positioned between the driver's seat and the passenger seat of the vehicle.

[0270] In addition, the optical path control member according to the embodiment can be applied to an instrument panel that displays the vehicle's speed, engine, and warning signals, etc.

[0271] In addition, the light path control member according to the embodiment can be applied to the front windshield (FG) or the left and right window glass of the vehicle.

[0273] The 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 only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment may be combined or modified and implemented in other embodiments by a person skilled in the art to which the embodiments belong. Therefore, details regarding such combinations and modifications should be interpreted as being included within the scope of the present invention.

[0274] Furthermore, although the invention has been described above with reference to embodiments, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Differences related to such modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

Claims

Claim 1 A light path control member comprising: a first substrate; a first electrode disposed on the first substrate; a light conversion member disposed on the first electrode; a second substrate disposed on the first substrate; a second electrode disposed under the second substrate; and an adhesive layer disposed between the light conversion member and the second electrode, wherein the light conversion member comprises alternately disposed partition members and receiving members, wherein the receiving member has a light transmittance that changes according to the application of voltage, wherein the receiving member receives light conversion particles and a dispersion, wherein the light conversion particles include carbon black, the dispersion includes an additive and a dispersant, and the additive is a non-reactive additive comprising a material in which a functional group is bonded to polydimethylsiloxane. Claim 2 A light path control member comprising: a first substrate; a first electrode disposed on the first substrate; a light conversion member disposed on the first electrode; a second substrate disposed on the first substrate; a second electrode disposed under the second substrate; and an adhesive layer disposed between the light conversion member and the second electrode, wherein the light conversion member includes alternately disposed partition members and receiving members, wherein the receiving member has a light transmittance that changes according to the application of voltage, wherein the receiving member receives light conversion particles and a dispersion, wherein the light conversion particles include carbon black, the dispersion includes an additive and a dispersant, and comprises micelles formed by the reaction of the dispersant and the silane component of the additive. Claim 3 A light path control member according to claim 1, comprising 0.1% to 20% by weight of the non-reactive additive based on 100% by weight of the dispersion. Claim 4 In claim 2, the light path control member is a non-reactive additive comprising a material in which a functional group is bonded to polydimethylsiloxane. Claim 5 A light path control member according to claim 1 or 4, wherein the functional group comprises at least one of an alkyl group, an aryl group, an allyl group, an alkenyl group, an amido group, an amino group, a fluoroalkyl group, a halide group, an epoxy group, a carboxyl group, a hydroxyl group, an alkoxy group, and a methylhydrogen group. Claim 6 A light path control member according to claim 1 or 4, wherein the functional group comprises at least one of a siloxane-urethane copolymer, a siloxane-polycarbonate copolymer, a siloxane-polyester copolymer, a siloxane-polyimide copolymer, an acryloxymethylsiloxane, a p-styrylsiloxane, and a polysilform. Claim 7 An optical path control member according to claim 1 or 2, having a lateral transmittance of 30% or more. Claim 8 A light path control member according to claim 1 or 2, wherein the partition portion comprises a photocurable resin, and the photocurable resin comprises urethane acrylate, acrylate monomer, isobornyl acrylate, additive, photoinitiator, and acryloylmorpholine. Claim 9 A light path control member according to claim 1, wherein the dispersion comprises micelles formed by the reaction of the dispersant and the silane component of the additive. Claim 10 A display device comprising: a display panel; and a light path control member disposed on the display panel, wherein the light path control member comprises: a first substrate; a first electrode disposed on the first substrate; a light conversion unit disposed on the first electrode; a second substrate disposed on the first substrate; a second electrode disposed under the second substrate; and an adhesive layer disposed between the light conversion unit and the second electrode, wherein the light conversion unit comprises alternately disposed partition portions and receiving portions, wherein the receiving portion has a light transmittance that changes according to the application of voltage, wherein the receiving portion contains light conversion particles and a dispersion liquid, wherein the light conversion particles include carbon black, wherein the dispersion liquid includes an additive and a dispersant, and wherein the additive is a non-reactive additive comprising a material in which a functional group is bonded to polydimethylsiloxane.

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