Light path control component and display device comprising the same

Abstract

The light path control member of the 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; a light conversion unit disposed between the first electrode and the second electrode; and an adhesive layer between the light conversion unit and the second electrode, wherein the light conversion unit includes alternatingly disposed partition portions and receiving portions, a dispersion liquid for changing light transmittance is disposed inside the receiving portions, the dispersion liquid is disposed in direct contact with a bottom surface, an inner surface of the receiving portions, and a lower surface of the adhesive layer, a first contact angle between the dispersion liquid and the bottom surface and the inner side surface of the receiving portions is 20° or less, a second contact angle between the dispersion liquid and the lower surface of the adhesive layer is 20° or less, and a difference between the first contact angle and the second contact angle is 1° to 5°.

Description

TECHNICAL FIELD

[0001] Embodiments relate to a light path control member and a display device including the same. BACKGROUND

[0002] The light blocking film blocks transmission of light from a light source and is attached to a front surface of a display panel that is a display device for a mobile phone, a notebook computer, a tablet computer, a vehicle navigation device, a vehicle touch screen, etc., thereby adjusting a viewing angle of light according to an incident angle of light when the display transmits an image so as to present clear image quality at a viewing angle desired by a user.

[0003] In addition, the light blocking film can be used for a window such as a vehicle, a building, etc. to partially shield light from the outside so as to prevent glare or prevent the inside from being seen from the outside.

[0004] That is, the light blocking film can be a light path control member that controls a moving path of light so as to block light in a specific direction and transmit light in the specific direction. Accordingly, it is possible to control a transmission angle of light and thus a viewing angle of a user through the light blocking film.

[0005] On the other hand, such a light blocking film can be classified into a light blocking film that always controls a viewing angle regardless of a surrounding environment or a user environment and a switchable light blocking film that allows a user to turn on / off viewing angle control according to the surrounding environment or the user environment.

[0006] Such a switchable light blocking film can be implemented in a manner that a pattern portion is switched to a light transmitting portion and a light blocking portion by filling a particle that moves when a voltage is applied and a dispersion liquid for dispersing the particle inside the pattern portion and dispersing and aggregating the particle.

[0007] The dispersion liquid can be disposed inside the pattern portion in a negative relief shape through a capillary injection method. The capillary injection method has a problem in that a process takes a long time and uneven filling occurs for each pattern portion.

[0008] Therefore, there is a need for a light path control member having a novel structure capable of solving the above-described problems. SUMMARY

[0009] TECHNICAL PROBLEM

[0010] Embodiments provide a light path control member that is easily manufactured and has improved reliability.

[0011] TECHNICAL SOLUTION

[0012] The light path control member of the 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, a light conversion unit disposed between the first electrode and the second electrode, and an adhesive layer disposed between the light conversion unit and the second electrode, wherein the light conversion unit includes a partition portion and a housing portion alternately disposed, a dispersion liquid that changes a light transmittance is disposed inside the housing portion, the dispersion liquid is disposed in direct contact with a bottom surface, an inner surface of the housing portion, and a lower surface of the adhesive layer, a first contact angle between the dispersion liquid and the bottom surface and the inner surface of the housing portion is 20° or less, a second contact angle between the dispersion liquid and the lower surface of the adhesive layer is 20° or less, and a difference between the first contact angle and the second contact angle is 1° to 5°.

[0013] Advantageous Effects

[0014] The light path control member of the embodiment can control the contact angle of the dispersion liquid disposed inside the housing portion.

[0015] Specifically, the contact angles of the inner surface and the bottom surface of the housing portion in contact with the dispersion liquid and the lower surface of the adhesive layer are 20° or less.

[0016] Therefore, the inner surface and the bottom surface of the housing portion and the lower surface of the adhesive layer having the contact angles of 20° or less can have a property close to a hydrophobic property. Therefore, when the dispersion liquid having the hydrophobic property is injected into the inside of the housing portion, the dispersion liquid is injected through the contact surfaces having similar properties, and thus, the filling speed and the filling property of the dispersion liquid can be improved.

[0017] In addition, the dispersion liquid can control the difference between the first contact angle with the inner surface and the bottom surface of the housing portion and the second contact angle with the adhesive layer within a certain size range. Therefore, the difference between the speed in the region in contact with the housing portion and the speed in the region in contact with the adhesive layer can be reduced.

[0018] Therefore, since the dispersion liquid can be filled into the housing portion at a uniform speed, the uniformity of the filled dispersion liquid can be improved.

[0019] In addition, the dispersion liquid can have a certain composition, and the solvent of the dispersion liquid can have a dielectric constant within a certain size range. Therefore, the first contact angle and the second contact angle can have a size of 20° or less by controlling the composition of the dispersion liquid and the dielectric constant of the solvent.

[0020] That is, in the light path control member of the embodiment, the filling property in the housing portion and the filling uniformity of the plurality of housing portions can be improved by controlling the contact angles of the surfaces in contact with the dispersion liquid, and thus, the properties and the reliability are improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 and Figure 2 is a perspective view of a light path control member of one embodiment.

[0022] Figure 3 and Figure 4 is a perspective view of a first substrate and a first electrode and a perspective view of a second substrate and a second electrode of a light path control member of an embodiment.

[0023] Figures 5 to 7 is a perspective view for describing a light path control member on which a sealing portion is provided of one embodiment.

[0024] Figure 8 and Figure 9 is a perspective view for describing a light path control member on which a sealing portion is provided of another embodiment.

[0025] Figure 10 and Figure 11 is a cross-sectional view taken along line A-A' in Figure 1 .

[0026] Figure 12 is an enlarged view of a region B in Figure 10 .

[0027] Figure 13 is an enlarged view of a region C in Figure 12 .

[0028] Figure 14 is an enlarged view of a region D in Figure 12 .

[0029] Figures 15 to 18 is another cross-sectional view taken along line A-A' in Figure 1 .

[0030] Figure 19 is an enlarged view of a region E in Figure 10 .

[0031] Figure 20 is an enlarged view of a region F in Figure 11 .

[0032] Figures 21 to 28 is a diagram for describing a manufacturing method of a light path control member of one embodiment.

[0033] Figure 29 and Figure 30 are cross-sectional views of display devices to which a light path control member of one embodiment is applied.

[0034] Figures 31 to 33FIG. 1 is a diagram for describing an embodiment of a display device to which the light path control member of the above-described embodiment is applied. DETAILED DESCRIPTION

[0035] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. However, the spirit and scope of the present application are not limited to the described embodiments, but can be implemented in various other forms, and one or more components in the embodiments can be selectively combined and replaced with each other within the spirit and scope of the present application.

[0036] In addition, unless explicitly defined and described otherwise, terms used in the embodiments of the present application, including technical and scientific terms, can be interpreted as meanings that are commonly understood by one of ordinary skill in the art, and the meanings of terms defined in a commonly used dictionary can be interpreted as having meanings consistent with the meanings in the context of related fields.

[0037] In addition, the terms used in the embodiments of the present application are used to describe the embodiments and are not intended to limit the present application. In the present specification, the singular form can include the plural form unless explicitly described otherwise in the context, and when described as "at least one of A, B, and C", it can include at least one of all combinations of A, B, and C that can be combined.

[0038] Further, in describing the components of the embodiments of the present application, terms such as first, second, A, B, (a), and (b) can be used. These terms are used only to distinguish the components from other components, and the terms do not limit the nature, order, and sequence of the components.

[0039] In addition, when one component is described as being "connected", "coupled", or "contacted" with other components, it can include not only a case where the component is directly connected, coupled, or contacted with the other components, but also a case where another component is interposed between the component and the other components.

[0040] Further, when described as being "on" or "under" each component, "on" or "under" can include not only a case where two components are directly connected to each other, but also a case where another component is interposed between the two components.

[0041] In addition, when expressed as "on" or "under", based on one component, not only the upper side direction but also the lower side direction can be included.

[0042] Hereinafter, the optical path control part of the embodiment will be described with reference to the accompanying drawings. The optical path control part described later relates to a switchable optical path control part that is driven in a plurality of modes according to electrophoretic particles that move by application of a voltage.

[0043] Referring to Figures 1 to 4 The optical path control part 1000 of the embodiment can include a first substrate 110, a second substrate 120, a first electrode 210, a second electrode 220, and a light conversion unit 300.

[0044] The first substrate 110 can support the first electrode 210. The first substrate 110 can be rigid or flexible.

[0045] In addition, the first substrate 110 can be transparent. For example, the first substrate 110 can include a transparent substrate capable of transmitting light.

[0046] The first substrate 110 can include glass, plastic, or a flexible polymer film. For example, the flexible polymer film can 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), cellulose triacetate (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, and styrene (PS), which is only an example, and the embodiment is not limited thereto.

[0047] In addition, the first substrate 110 can be a flexible substrate having a flexible characteristic.

[0048] Further, the first substrate 110 can be a curved substrate or a bent substrate. That is, the optical path control part including the first substrate 110 can also be formed to have a flexible characteristic, a curved characteristic, or a bent characteristic. Accordingly, the optical path control part of the embodiment can be changed to various designs.

[0049] The first substrate 110 can extend in a first direction 1A, a second direction 2A, and a third direction 3A.

[0050] Specifically, the first substrate 110 can include the first direction 1A corresponding to the length direction or the width direction of the first substrate 110, the second direction 2A extending in a direction different from the first direction 1A and corresponding to the length direction or the width direction of the first substrate 110, and the 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.

[0051] For example, the first direction 1A can be defined as a length direction of the first substrate 110, the second direction 2A can be defined as a width direction of the first substrate 110 perpendicular to the first direction 1A, and the third direction 3A can be defined as a thickness direction of the first substrate 110. Alternatively, the first direction 1A can be defined as a width direction of the first substrate 110, the second direction 2A can be defined as a length direction of the first substrate 110 perpendicular to the first direction 1A, and the third direction 3A can be defined as a thickness direction of the first substrate 110.

[0052] Hereinafter, for convenience of description, the first direction 1A is described as a length direction of the first substrate 110, the second direction 2A is described as a width direction of the first substrate 110, and the third direction 3A is described as a thickness direction of the first substrate 110.

[0053] The first electrode 210 can be disposed on a surface of the first substrate 110. Specifically, the first electrode 210 can be disposed on an upper surface of the first substrate 110. That is, the first electrode 210 can be disposed between the first substrate 110 and the second substrate 120.

[0054] The first electrode 210 can include a transparent conductive material. For example, the first electrode 210 can include a conductive material having a light transmittance of about 80% or more. For example, the first electrode 210 can include a metal oxide such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, or the like.

[0055] The thickness of the first electrode 210 can be 0.05 μm to 2 μm.

[0056] Alternatively, the first electrode 210 can include a plurality of metals to achieve low resistance. For example, the first electrode 210 can include at least one metal among chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), titanium (Ti), and alloys thereof.

[0057] Referring to Figure 3 The first electrode 210 can be disposed on the entire surface of one surface of the first substrate 110. Specifically, the first electrode 210 can be configured as a surface electrode on one surface of the first substrate 110. However, embodiments are not limited thereto, and the first electrode 210 can be formed of a plurality of pattern electrodes having a uniform pattern such as a mesh shape or a bar shape, or the like.

[0058] For example, the first electrode 210 can include a plurality of conductive patterns. Specifically, the first electrode 210 can include a plurality of mesh lines crossing each other and a plurality of mesh openings formed by the mesh lines.

[0059] Accordingly, even if the first electrode 210 includes a metal, the first electrode 210 is not seen from the outside, and thus, visibility can be improved. In addition, the light transmittance is improved through the opening, and thus, the brightness of the light path control member of the embodiment can be improved.

[0060] The second substrate 120 can be disposed on the first substrate 110. Specifically, the second substrate 120 can be disposed on the first electrode 210 located on the first substrate 110.

[0061] The second substrate 120 can include a material capable of transmitting light. The second substrate 120 can include a transparent material. The second substrate 120 can include the same or similar material as the material of the first substrate 110 described above.

[0062] For example, the second substrate 120 can include glass, plastic, or a flexible polymer film. For example, the flexible polymer film can 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), triacetyl cellulose (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, and styrene (PS). This is merely an example, and the embodiment is not limited thereto.

[0063] In addition, the second substrate 120 can be a flexible substrate having a flexible characteristic.

[0064] Further, the second substrate 120 can be a curved substrate or a bent substrate. That is, the light path control member including the second substrate 120 can also be formed to have a flexible characteristic, a curved characteristic, or a bent characteristic. Accordingly, the light path control member of the embodiment can be changed to various designs.

[0065] The second substrate 120 can 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.

[0066] Specifically, the second substrate 120 can include the first direction 1A corresponding to the length direction or the width direction of the second substrate 120, the second direction 2A extending in a direction different from the first direction 1A and corresponding to the length direction or the width direction of the second substrate 120, and the 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.

[0067] For example, the first direction 1A can be defined as the length direction of the second substrate 120, the second direction 2A can be defined as the width direction of the second substrate 120 perpendicular to the first direction 1A, and the third direction 3A can be defined as the thickness direction of the second substrate 120.

[0068] Alternatively, the first direction 1A can be defined as a width direction of the second substrate 120, the second direction 2A can be defined as a length direction of the second substrate 120 perpendicular to the first direction 1A, and the third direction 3A can be defined as a thickness direction of the second substrate 120.

[0069] Hereinafter, for convenience of description, the first direction 1A is described as a length direction of the second substrate 120, the second direction 2A is described as a width direction of the second substrate 120, and the third direction 3A is described as a thickness direction of the second substrate 120.

[0070] The second electrode 220 can be disposed on a surface of the second substrate 120. Specifically, the second electrode 220 can be disposed on a lower surface of the second substrate 120. That is, the second electrode 220 can be disposed on a surface of the second substrate 120 facing the first substrate 110. That is, the second electrode 220 can be disposed to face the first electrode 210 on the first substrate 110. That is, the second electrode 220 can be disposed between the first electrode 210 and the second substrate 120.

[0071] The second electrode 220 can include the same or similar material as the material of the first electrode 210 described above.

[0072] The second electrode 220 can include a transparent conductive material. For example, the second electrode 220 can include a conductive material having a light transmittance of about 80% or more. For example, the second electrode 220 can include a metal oxide such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, or the like.

[0073] The thickness of the second electrode 220 can be about 0.1 μm to about 0.5 μm.

[0074] Alternatively, the second electrode 220 can include a plurality of metals to achieve low resistance. For example, the second electrode 220 can include at least one metal among chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), titanium (Ti), and alloys thereof.

[0075] Referring to Figure 4 The second electrode 220 can be disposed on the entire surface of the surface of the second substrate 120. Specifically, the second electrode 220 can be configured as a surface electrode on the surface of the second substrate 120. However, embodiments are not limited thereto, and the second electrode 220 can be formed of a plurality of pattern electrodes having a uniform pattern such as a mesh shape or a bar shape, or the like.

[0076] For example, the second electrode 220 can include a plurality of conductive patterns. Specifically, the second electrode 220 can include a plurality of mesh lines crossing each other and a plurality of mesh openings formed by the mesh lines.

[0077] Therefore, even if the second electrode 220 includes a metal, the second electrode 220 is not seen from the outside, and thus, visibility can be improved. In addition, the light transmittance is improved by the opening, and thus, the brightness of the light path control member of the embodiment can be improved.

[0078] The first substrate 110 and the second substrate 120 can have sizes corresponding to each other. The first substrate 110 and the second substrate 120 can have the same or similar sizes to each other.

[0079] Specifically, the size of the first length of the first substrate 110 extending in the first direction 1A can be the same as or similar to the size of the second length L2 of the second substrate 120 extending in the first direction 1A.

[0080] For example, the sizes of the first length and the second length can be 300 mm to 400 mm.

[0081] In addition, the size of the first width of the first substrate 110 extending in the second direction 2A can be the same as or similar to the size of the second width of the second substrate 120 extending in the second direction 2A.

[0082] For example, the sizes of the first width and the second width can be 150 mm to 200 mm.

[0083] In addition, the size of the first thickness of the first substrate 110 extending in the third direction 3A can be the same as or similar to the size of the second thickness of the second substrate 120 extending in the third direction 3A.

[0084] For example, the sizes of the first thickness and the second thickness can be 30 μm to 200 μm.

[0085] Referring to Figure 1 The first substrate 110 and the second substrate 120 can be configured to be offset from each other.

[0086] Specifically, the first substrate 110 and the second substrate 120 can be configured at positions offset from each other in the first direction 1A. Specifically, the first substrate 110 and the second substrate 120 can be configured such that the side surfaces of the substrates are offset from each other.

[0087] Therefore, the first substrate 110 can be configured to protrude in one direction in the first direction 1A, and the second substrate 120 can be configured to protrude in the other direction in the first direction 1A.

[0088] That is, the first substrate 110 can include a first protruding portion protruding in one direction in the first direction 1A, and the second substrate 120 can include a second protruding portion protruding in the other direction in the first direction 1A.

[0089] Accordingly, the light path control member 1000 can include a region in which the first electrode 210 is exposed on the first substrate 110 and a region in which the second electrode 220 is exposed under the second substrate 120.

[0090] That is, the first electrode 210 disposed on the first substrate 110 can be exposed at the first protrusion, and the second electrode 220 disposed under the second substrate 120 can be exposed at the second protrusion.

[0091] The first electrode 210 and the second electrode 220 exposed at the protrusions can be connected to an external printed circuit board through a connection part to be described later.

[0092] Alternatively, referring to Figure 2 , the first substrate 110 and the second substrate 120 can be disposed at positions corresponding to each other. Specifically, the first substrate 110 and the second substrate 120 can be disposed such that their side surfaces correspond to each other.

[0093] Accordingly, the first substrate 110 can be disposed to protrude in one direction along the first direction 1A, and the second substrate 120 can also be disposed to protrude in one direction along the first direction 1A, that is, can be disposed to protrude in the same direction as the first substrate 110.

[0094] That is, the first substrate 110 can include a first protrusion protruding in one direction along the first direction 1A, and the second substrate can include a second protrusion protruding in one direction along the first direction 1A.

[0095] That is, the first protrusion and the second protrusion can protrude in the same direction.

[0096] Accordingly, the light path control member 1000 can include a region in which the first electrode 210 is exposed on the first substrate 110 and a region in which the second electrode 220 is exposed under the second substrate 120.

[0097] That is, the first electrode 210 disposed on the first substrate 110 can be exposed at the first protrusion, and the second electrode 220 disposed under the second substrate 120 can be exposed at the second protrusion.

[0098] The first electrode 210 and the second electrode 220 exposed at the protrusions can be connected to an external printed circuit board through a connection part to be described later.

[0099] The light conversion unit 300 can be disposed between the first substrate 110 and the second substrate 120. Specifically, the light conversion unit 300 can be disposed between the first electrode 210 and the second electrode 220.

[0100] A functional layer is disposed between at least one of the light conversion unit 300 and the first substrate 110 and the light conversion unit 300 and the second substrate 120.

[0101] Specifically, a buffer layer 410 that facilitates adhesion between the light conversion unit 300 and the first substrate 110 can be disposed between the light conversion unit 300 and the first substrate 110. In addition, an adhesion layer 420 that adheres the second electrode 220 to the light conversion unit 300 can be disposed between the light conversion unit 300 and the second substrate 120.

[0102] The light conversion unit 300 can include a plurality of partition portions and receiving portions. Light conversion particles that move according to the application of a voltage can be disposed in the receiving portions, and the light transmission characteristics of the light path control member can be changed by the light conversion particles.

[0103] The light path control member can include a sealing portion.

[0104] Referring to Figures 5 to 7 , the sealing portion 500 can be disposed on the outer surface of the light path control member.

[0105] The sealing portion 500 can be disposed to cover the outer surface of the light path control member. Specifically, the sealing portion 500 can be partially disposed to cover the outer surface of the light path control member. That is, the sealing portion 500 can extend from the first substrate 110 toward the second substrate 120 and partially cover the outer surface of the light path control member.

[0106] The light path control member 1000 can include a plurality of side surfaces. Specifically, the light path control member 1000 can include side surfaces that extend in the first direction 1A and face each other and side surfaces that extend in the second direction 2A and face each other.

[0107] The sealing portion 500 can be disposed to surround the side surface of the light path control member that extends in the first direction 1A. For example, the sealing portion 500 can be disposed to surround the side surface of the light path control member in which the receiving portion 320 in which the light conversion particles are disposed is exposed from the light conversion unit 300.

[0108] Specifically, as Figure 5 indicated, the sealing portion 500 can be disposed on the side surface of the light path control member to partially cover the receiving portion 320 exposed from the side surface of the light path control member.

[0109] Alternatively, as Figure 6 indicated, the sealing portion 500 can be disposed on the side surface of the light path control member to entirely cover the receiving portion 320 exposed from the side surface of the light path control member.

[0110] Specifically, with respect to the first substrate 110 and the second substrate 120, the receiving portion 320 can be disposed to extend in the second direction 2A from the light conversion unit 300. That is, a plurality of receiving portions 320 can extend in the second direction 2A apart from each other.

[0111] Accordingly, the accommodation portion 320 can be exposed in both side directions of the light conversion unit 300 in the first direction 1A. The sealing portion 500 can be disposed to cover the exposed accommodation portion 320 from the light conversion unit 300 to protect the light conversion particles inside the exposed accommodation portion.

[0112] That is, the sealing portion 500 can be disposed at a portion of the side surface of the light conversion unit 300, a portion of the lower surface of the first substrate 110, and a portion of the upper surface of the second substrate 120. In other words, the sealing portion 500 can be disposed to surround the exposed accommodation portion of the light conversion unit at a portion of the side surface of the light conversion unit 300, a portion of the lower surface of the first substrate 110, and a portion of the upper surface of the second substrate 120.

[0113] The sealing portion 500 can include a resin material having a viscosity of 300 cP or more.

[0114] Alternatively, referring to Figure 7 , the sealing portion 500 can be disposed to surround the side surface of the light path control member extending in the first direction 1A and the side surface of the light path control member extending in the second direction 2A.

[0115] Accordingly, at least one of the side surfaces of the light conversion unit 300 in the second direction can be entirely covered by the sealing portion 500.

[0116] Accordingly, in the light path control member of the embodiment, the outer surface of the light conversion unit 300 can be entirely sealed by the sealing portion 500. That is, penetration of impurities such as moisture and air into the accommodation portion from the side surface of the light conversion unit 300 in the second direction can be prevented.

[0117] That is, in 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 can differ from each other due to tolerances, and the width of the side surface in the second direction is small, so impurities that can penetrate into the accommodation portion can penetrate into the accommodation portion through the partition portion.

[0118] In the light path control member of the embodiment, by disposing the sealing portion also on the side surface of the light conversion unit in the second direction, penetration of impurities according to the size of the partition portion can be effectively prevented.

[0119] On the other hand, although it is shown in Figures 5 to 7 that the sealing portion is disposed on the outer surface of the light path control member, the embodiment is not limited thereto, and the sealing portion can be disposed on the upper surface of the light conversion unit 300.

[0120] Referring to Figure 8 and Figure 9 , unlike Figure 1 and Figure 2The first substrate 110 and the second substrate 120 can have different sizes.

[0121] Specifically, a size of a first length of the first substrate 110 extending in the first direction 1A can be the same as or similar to a size of a second length L2 of the second substrate 120 extending in the first direction 1A and within a size range of 300 mm to 400 mm.

[0122] In addition, a size of a first width of the first substrate 110 extending in the second direction 2A and a size of a second width of the second substrate 120 extending in the second direction can be different and within a size range of 150 mm to 200 mm.

[0123] For example, the second width of the second substrate 120 extending in the second direction can be smaller than the first width of the first substrate 110 extending in the second direction 2A.

[0124] Accordingly, both ends of the light conversion unit 300 in the second direction can be configured to be spaced apart from the second substrate 120.

[0125] The sealing part 500 and the bank part 600 can be respectively configured at both ends of the light conversion unit 300 in the second direction.

[0126] When the light conversion material is injected into the accommodation part, the bank part 600 can determine an injection part and an outlet part, and the sealing part 500 can seal the injection part and the outlet part after the light conversion material is injected.

[0127] That is, the sealing part 500 can fill the accommodation part 320 of the light conversion unit 300 at both ends of the light conversion unit 300 in the second direction, and be configured in the partition part 310.

[0128] Referring to Figure 10 and Figure 11 The light conversion unit 300 can include the partition part 310 and the accommodation part 320.

[0129] The partition part 310 can be defined as a partition part that divides the accommodation part. That is, as a barrier area that divides a plurality of accommodation parts, the partition part 310 can be light-transmissive. In addition, the accommodation part 320 can be defined as a variable area that switches to a light-blocking part and a light-transmissive part according to the application of a voltage.

[0130] The partition part 310 and the accommodation part 320 can be alternately configured with each other. The partition part 310 and the accommodation part 320 can be configured to have different widths. For example, the width of the partition part 310 can be greater than the width of the accommodation part 320.

[0131] The partition portions 310 and the accommodation portions 320 can be alternately arranged with each other. Specifically, the partition portions 310 and the accommodation portions 320 can be alternately arranged with each other. That is, each of the partition portions 310 can be arranged between the accommodation portions 320 adjacent to each other, and each of the accommodation portions 320 can be arranged between the partition portions 310 adjacent to each other.

[0132] The partition portion 310 can include a transparent material. The partition portion 310 can include a material that is transparent to light.

[0133] The partition portion 310 can include a resin material. For example, the partition portion 310 can include a photocurable resin material. For example, the partition portion 310 can include a UV resin or a transparent photoresist resin. Alternatively, the partition portion 310 can include a polyurethane resin or an acrylic resin.

[0134] The partition portion 310 can transmit light incident on any one of the first substrate 110 and the second substrate 120 toward the other substrate.

[0135] For example, in the case where the light source is arranged under the first substrate 110, the light can be emitted from the first substrate 110, and the light can be incident on the second substrate 120. At this time, the partition portion 310 can be transparent to the light, and the transmitted light can move toward the second substrate 120. Figure 10 and Figure 11 In the case where the light source is arranged under the first substrate 110, the light can be emitted from the first substrate 110, and the light can be incident on the second substrate 120. At this time, the partition portion 310 can be transparent to the light, and the transmitted light can move toward the second substrate 120.

[0136] The accommodation portion 320 can include a dispersion liquid 320a and light conversion particles 320b. Specifically, the accommodation portion 320 can be filled by injecting the dispersion liquid 320a. The plurality of light conversion particles 320b can be dispersed in the dispersion liquid 320a.

[0137] The dispersion liquid 320a can be a material for dispersing the light conversion particles 320b. The dispersion liquid 320a can include a transparent material. The dispersion liquid 320a can include a non-polar solvent. In addition, the dispersion liquid 320a can include a material that is transparent to light. For example, the dispersion liquid 320a can include at least one of a halogen hydrocarbon-based oil, a paraffin-based oil, and isopropyl alcohol.

[0138] The light conversion particles 320b can be arranged to be dispersed in the dispersion liquid 320a. Specifically, the plurality of light conversion particles 320b can be arranged to be spaced apart from each other in the dispersion liquid 320a.

[0139] The light conversion particles 320b can include a material capable of absorbing light. That is, the light conversion particles 320b can be light-absorbing particles. The light conversion particles 320b can have a color. For example, the light conversion particles 320b can have a color of a black series. For example, the light conversion particles 320b can include carbon black.

[0140] The light conversion particles 320b can have polarity by having their surfaces charged. For example, the surfaces of the light conversion particles 320b can have a negative (-) charge. Thus, by applying a voltage, the light conversion particles 320b can move toward the first electrode 210 or the second electrode 220.

[0141] The light transmittance of the accommodation portion 320 can be changed by the light conversion particles 320b. Specifically, the accommodation portion 320 can change the light transmittance by the movement of the light conversion particles 320b to switch to a light blocking portion and a light transmitting portion. That is, the accommodation portion 320 can change the light transmittance of light passing through the accommodation portion 320 by dispersing and aggregating the light conversion particles 320b disposed inside the dispersion liquid 320a.

[0142] For example, the light path control member of the embodiment can be switched 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.

[0143] Specifically, in the light path control member of the embodiment, the accommodation portion 320 becomes a light blocking portion in the first mode, and light of a specific angle can be blocked by the accommodation portion 320. That is, the angle of view of a user watching from the outside is narrowed, and thus the light path control member can be driven in a privacy mode.

[0144] In addition, in the light path control member of the embodiment, the accommodation portion 320 becomes a light transmitting portion in the second mode, and in the light path control member of the embodiment, light can pass through both the partition portion 310 and the accommodation portion 320. That is, the angle of view of a user watching from the outside is widened, and thus the light path control member can be driven in a sharing mode.

[0145] Switching from the first mode to the second mode, that is, the conversion of the accommodation portion 320 from a light blocking portion to a light transmitting portion can be achieved by the movement of the light conversion particles 320b of the accommodation portion 320. That is, the light conversion particles 320b can be charged on their surfaces and can move toward the first electrode or the second electrode according to the characteristics of the charge by applying a voltage. That is, the light conversion particles 320b can be electrophoretic particles.

[0146] Specifically, the accommodation portion 320 can be electrically connected with the first electrode 210 and the second electrode 220.

[0147] At this time, when a voltage is not applied to the light path control member from the outside, the light conversion particles 320b of the accommodation portion 320 are uniformly dispersed in the dispersion liquid 320a, and the accommodation portion 320 can block light by the light conversion particles. Thus, in the first mode, the accommodation portion 320 can be driven as a light blocking portion.

[0148] Or, when a voltage is applied to the light path control member from the outside, the light conversion particles 320b can move, for example, the light conversion particles 320b can move toward one end or the other end of the accommodation portion 320 by means of the voltage transmitted through the first electrode 210 and the second electrode 220. That is, the light conversion particles 320b can move from the accommodation portion 320 toward the first electrode 210 or the second electrode 220.

[0149] 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 the light conversion particles 320b having a negative charge move toward the positive electrode among the first electrode 210 and the second electrode 220 using the dispersion liquid 320a as a medium.

[0150] That is, when a voltage is applied to the first electrode 210 and / or the second electrode 220, as shown in FIG. 4B, the light conversion particles 320b can move in the dispersion liquid 320a toward the first electrode 210. That is, the light conversion particles 320b can move in one direction, and the accommodation portion 320 can be driven as a light transmission portion. Figure 10

[0151] Or, when no voltage is applied to the first electrode 210 and / or the second electrode 220, as shown in FIG. 4A, the light conversion particles 320b can be uniformly dispersed in the dispersion liquid 320a, driving the accommodation portion 320 as a light blocking portion. Figure 11

[0152] Therefore, the light path control member of the embodiment can be driven in two modes according to the user's surrounding environment. That is, when the user needs only a specific viewing angle of light transmission, the accommodation portion is driven as a light blocking portion, or in an environment where the user needs high brightness, a voltage can be applied to drive the accommodation portion as a light transmission portion.

[0153] Therefore, the light path control member of the embodiment can be implemented in two modes according to the user's needs, and thus the light path control member can be applied regardless of the user's environment.

[0154] As described above, the dispersion liquid 320a in which the light conversion particles 320b are dispersed can be disposed inside the accommodation portion 320.

[0155] The dispersion liquid 320a can be disposed in each accommodation portion in a direction from the injection portion toward the outlet portion using a capillary injection method. At this time, the filling property of the injected dispersion liquid can be changed according to the characteristics of the dispersion liquid 320a and the characteristics of the inside of the accommodation portion 320 and the adhesive layer 420 in contact with the dispersion liquid 320a.

[0156] That is, when the inside of the accommodation portion 320 and the adhesive layer 420 in contact with the dispersion liquid have a hydrophobic property, the filling property of the dispersion liquid 320a having a hydrophobic property inside the accommodation portion can be improved.​​

[0157] Thus, in the light path control member of the embodiment, by controlling the dielectric constant and the composition of the dispersion liquid 320a and controlling the contact angle between the dispersion liquid and the inside of the housing portion 320 and the adhesive layer 420 so that the properties of the housing portion and the adhesive layer have a hydrophobicity similar to that of the dispersion liquid, the filling property of the dispersion liquid is improved.

[0158] Referring to Figures 12 to 14 The dispersion liquid 320a disposed in the housing portion 320 can be configured to be in direct contact with the bottom surface BS of the housing portion 320, the inner surface IS of the housing portion 320, and the lower surface of the adhesive layer 420.

[0159] The dispersion liquid of the light path control member of the embodiment can have different contact angles at the inner surface IS of the housing portion 320 and the lower surface of the adhesive layer 420.

[0160] Specifically, when the dispersion liquid 320a contacts the bottom surface BS of the housing portion 320 and the inner surface IS of the housing portion, the dispersion liquid 320a can have a first contact angle θ1. In addition, when the dispersion liquid 320a contacts the lower surface of the adhesive layer 420, the dispersion liquid 320a can have a second contact angle θ2.

[0161] The first contact angle θ1 can be defined as an angle between a surface of a droplet of the dispersion liquid and the bottom surface and the inner surface of the housing portion when the dispersion liquid is dropped on the bottom surface and the inner surface of the housing portion.

[0162] In addition, the second contact angle θ2 can be defined as an angle between a surface of a droplet of the dispersion liquid and the lower surface of the adhesive layer when the dispersion liquid is dropped on the lower surface of the adhesive layer.

[0163] The first contact angle θ1 and the second contact angle θ2 can be 20° or less.

[0164] Specifically, the first contact angle θ1 can be 20° or less. More specifically, the first contact angle θ1 can be 5° to 20°. More specifically, the first contact angle θ1 can be 8° to 15°.

[0165] When the first contact angle θ1 has a contact angle greater than 20°, the bottom surface BS of the housing portion 320 and the inner surface IS of the housing portion in contact with the dispersion liquid 320a have properties close to hydrophilicity, and thus, the dispersion liquid 320a having hydrophobicity is not easily filled into the housing portion.

[0166] In addition, when the first contact angle θ1 is formed to be less than 5°, the weight % of the light conversion particles 320b dispersed inside the dispersion liquid 320a can be changed, and thus, the light conversion properties of the light path control member can be deteriorated.

[0167] In addition, the second contact angle θ2 can be 20° or less. More specifically, the second contact angle θ2 can be 3° to 15°. More specifically, the second contact angle θ2 can be 5° to 10°.

[0168] When the second contact angle θ2 has a contact angle greater than 20°, the adhesive layer in contact with the dispersion liquid 320a has a property close to hydrophilicity, and thus the dispersion liquid 320a having hydrophobicity is not easily filled into the accommodation portion through the adhesive layer.

[0169] In addition, when the second contact angle θ2 is formed to be less than 3°, the weight % of the light conversion particles 320b dispersed in the dispersion liquid 320a can be changed, and thus the light conversion characteristics of the light path control member can be deteriorated.

[0170] That is, since the first contact angle θ1 of the bottom surface BS of the accommodation portion 320 and the inner surface IS of the accommodation portion in contact with the dispersion liquid 320a having hydrophobicity and the second contact angle θ2 of the lower surface of the adhesive layer 420 in contact with the dispersion liquid 320a are formed to be 20° or less, the bottom surface BS of the accommodation portion 320, the inner surface IS of the accommodation portion, and the lower surface of the adhesive layer 420 can have hydrophobicity. That is, the bottom surface BS of the accommodation portion 320, the inner surface IS of the accommodation portion, and the lower surface of the adhesive layer 420 can have hydrophobicity similar to that of the dispersion liquid 302a.

[0171] In addition, the first contact angle θ1 and the second contact angle θ2 can be different. Specifically, the size of the first contact angle θ1 can be greater than the size of the second contact angle θ2. In addition, the difference θ1-θ2 between the first contact angle θ1 and the second contact angle θ2 can be 10° or less. Specifically, the difference θ1-θ2 between the first contact angle θ1 and the second contact angle θ2 can be 1° to 5°. More specifically, the difference θ1-θ2 between the first contact angle θ1 and the second contact angle θ2 can be 3° to 5°.

[0172] By forming the difference between the first contact angle θ1 and the second contact angle θ2 to be within the above range, the filling property and the filling uniformity of the dispersion liquid inside the accommodation portion can be improved.

[0173] Specifically, the difference between the filling speed of the dispersion liquid in contact with the accommodation portion at the first contact angle and the filling speed of the dispersion liquid in contact with the adhesive layer at the second contact angle can be reduced. Thus, regardless of the type of the surface in contact with the dispersion liquid, the dispersion liquid can be filled into the inside of the accommodation portion at a similar filling speed.

[0174] Thus, the filling uniformity of the plurality of accommodation portions can be improved, and the filling property and the filling speed inside each accommodation portion can be improved.

[0175] The dispersion liquid 320a can include a solvent, light-converting particles 320b, and a dispersant. In order to control the magnitude of the first contact angle θ1 and the second contact angle θ2, the component ratio of the dispersion liquid 320a can be controlled at a certain ratio.

[0176] Specifically, the dispersion liquid 320a can include a solvent including at least one of a halogen hydrocarbon-based oil, a paraffin-based oil, and isopropyl alcohol.

[0177] The content of the solvent can be 89.5 wt% to 94.7 wt% with respect to the total weight of the dispersion liquid.

[0178] In addition, the light-converting particles 320b can include carbon black particles. The content of the light-converting particles 320b can be 1 wt% to 3.5 wt% with respect to the total weight of the dispersion liquid.

[0179] In addition, the dispersion liquid can include a dispersant capable of uniformly dispersing the light-converting particles in the solvent.

[0180] The content of the dispersant can be 1 wt% to 1.8 wt% with respect to the total weight of the dispersion liquid.

[0181] When the solvent, the light-converting particles 320b, and the dispersant deviate from the weight % range, the first contact angle of the dispersion liquid with the receiving portion and the second contact angle of the dispersion liquid with the adhesive layer increase, and thus the receiving portion and the adhesive layer approach hydrophilicity, thereby causing deterioration of the filling property of the dispersion liquid having hydrophobicity.

[0182] In addition, the solvent can have a certain magnitude of dielectric constant. Specifically, the dielectric constant of the solvent can be less than 7.5. More specifically, the dielectric constant of the solvent can be 1 to less than 7.5. More specifically, the dielectric constant of the solvent can be 2 to 3.

[0183] When the dielectric constant of the solvent is 7.5 or more, even if the component ratio is satisfied, the first contact angle of the dispersion liquid with the receiving portion and the second contact angle of the dispersion liquid with the adhesive layer increase due to the dielectric constant, and thus the receiving portion and the adhesive layer approach hydrophilicity, thereby causing deterioration of the filling property of the dispersion liquid having hydrophobicity.

[0184] On the other hand, the receiving portion can be configured in different shapes in consideration of driving characteristics or the like.

[0185] Referring to Figure 15 and Figure 16 , unlike Figure 10 and Figure 11 , in the light path control member of another embodiment, both end portions of the receiving portion 320 can be configured to be in contact with the buffer layer 410 and the adhesive layer 420.

[0186] For example, a lower portion of the accommodation portion 320 can be configured to be in contact with the buffer layer 410, and an upper portion of the accommodation portion 320 can be configured to be in contact with the adhesive layer 420.

[0187] Accordingly, a distance between the accommodation portion 320 and the first electrode 210 can be reduced, and thus a voltage applied from the first electrode 210 can be smoothly transmitted to the accommodation portion 320.

[0188] Accordingly, a moving speed of the light conversion particles 320b inside the accommodation portion 320 can be increased, and thus a driving characteristic of the light path control member can be improved.

[0189] In addition, referring to Figure 17 and Figure 18 In the light path control member of this embodiment, unlike Figure 10 and Figure 11 the accommodation portion 320 can be configured at a constant inclination angle θ.

[0190] In detail, referring to Figure 17 and Figure 18 the accommodation portion 320 can be configured to have an inclination angle θ of greater than 0° to less than 90° with respect to the first substrate 110. In detail, the accommodation portion 320 can extend upward at an inclination angle θ of greater than 0° to less than 90° with respect to a surface of the first substrate 110.

[0191] Accordingly, when the light path control member is used together with a display panel, moire caused by an overlapping phenomenon between a pattern of the display panel and the accommodation portion 320 of the light path control member can be alleviated, and thus user visibility can be improved.

[0192] The light path control member of this embodiment can control a contact angle of a dispersion liquid disposed inside the accommodation portion.

[0193] In detail, a contact angle of an inner surface and a bottom surface of the accommodation portion, which are in contact with the dispersion liquid in the accommodation portion, and a lower surface of the adhesive layer can be controlled to be 20° or less.

[0194] Accordingly, the inner surface and the bottom surface of the accommodation portion, which have a contact angle of 20° or less, and the lower surface of the adhesive layer can have a property close to a hydrophobic property. Accordingly, when the dispersion liquid having a hydrophobic property is filled inside the accommodation portion, the dispersion liquid is filled through the contact surfaces having similar properties, and thus a filling speed and a filling property of the dispersion liquid can be improved.

[0195] In addition, the dispersion liquid can control a difference between a first contact angle with the inner surface and the bottom surface of the accommodation portion and a second contact angle with the adhesive layer to be within a certain size range. Accordingly, a difference between a speed in a region in contact with the accommodation portion and a speed in a region in contact with the adhesive layer can be reduced.

[0196] Therefore, since the dispersion liquid can be filled into the accommodation portion at a uniform speed, the uniformity of the filled dispersion liquid can be improved.

[0197] In addition, the dispersion liquid can have a certain component, and the solvent of the dispersion liquid can have a dielectric constant within a certain size range. Therefore, by controlling the component of the dispersion liquid and the dielectric constant of the solvent, the first contact angle and the second contact angle can have a size of 20° or less.

[0198] That is, in the light path control member of this embodiment, the filling property in the accommodation portion can be improved and the filling uniformity of the plurality of accommodation portions can be improved by controlling the contact angle of the surface in contact with the dispersion liquid, so that the characteristics and reliability are improved.

[0199] Hereinafter, referring to Figure 19 and Figure 20 , the light path control member of another embodiment will be described.

[0200] Referring to Figure 19 and Figure 20 , the light conversion material can be disposed in the accommodation portion 320. Specifically, the light conversion material having a constant viscosity can be disposed inside the accommodation portion 320.

[0201] The light conversion material can include a solvent 320a, light conversion particles 320b, and liquid crystals 320c. The light conversion particles 320b and the liquid crystals 320c can be dispersed in the solvent 320a.

[0202] That is, the accommodation portion 320 can be filled by injecting the solvent 320a in which the light conversion particles 320b and the liquid crystals 320c are dispersed.

[0203] The solvent 320a can be a material that disperses the light conversion particles 320b and the liquid crystals 320c. The dispersion liquid 320a can include a transparent material. The solvent 320a can include a material capable of transmitting light.

[0204] The solvent 320a can include a polar solvent or a non-polar solvent.

[0205] For example, the solvent 320a can include a material having an aromatic ring to have polarity. For example, the solvent 320a can include a polar hydrocarbon having an aromatic ring.

[0206] Alternatively, the solvent 320a can include at least one of a non-polar halogen hydrocarbon-based oil, a paraffin-based oil, and isopropyl alcohol.

[0207] The light conversion particles 320b can be disposed to be dispersed in the solvent 320a. Specifically, a plurality of light conversion particles 320b can be disposed to be spaced apart from each other in the solvent 320a.

[0208] The liquid crystals 320c can be dispersed in the solvent 320a.

[0209] Since the light conversion material includes the liquid crystal 320c, the light conversion material can have a low viscosity. Therefore, it is possible to increase the moving speed of the light conversion particles 320b dispersed in the solvent 320a. That is, it is possible to increase the moving speed of the light conversion particles 320b in inverse proportion to the viscosity of the solvent.

[0210] Therefore, it is possible to increase the moving speed of the light conversion particles 320b, thereby increasing the driving speed of the light path control member.

[0211] In addition, since the light conversion material includes the liquid crystal 320c, the light conversion material can have a low volatility.

[0212] That is, a general low-viscosity material has a problem in that the evaporation rate increases due to a decrease in the ignition point, but the light conversion material can achieve a low viscosity while preventing this problem by the liquid crystal 320c, thereby achieving a low viscosity while having a low volatility.

[0213] In addition, when a voltage is applied to the light path control member, the liquid crystal 320c can facilitate the movement of the light conversion particles 320b in movement.

[0214] Referring to Figure 20 When no voltage is applied to the light path control member, the liquid crystal 320c can be arranged in an irregular direction in the solvent 320a.

[0215] However, referring to Figure 19 When a voltage is applied to the light path control member, the liquid crystal 320c can be arranged in a regular direction in the solvent 320a. That is, the length direction of the liquid crystal 320c can be arranged along the direction in which the first electrode 210 and the second electrode 220 face each other.

[0216] Therefore, when the light conversion particles 320b move toward the first electrode 210 or the second electrode 220, the light conversion particles 320b can easily move by the liquid crystal 320c arranged in the moving direction of the light conversion particles 320b, thereby increasing the driving speed of the light conversion particles.

[0217] The content of the liquid crystal 320c can be in a constant weight % range with respect to the total weight of the light conversion material. The content of the liquid crystal 320c can be 10 wt% or less with respect to the total weight of the light conversion material. Specifically, the content of the liquid crystal 320c can be 1 wt% to 10 wt% with respect to the total weight of the light conversion material. More specifically, the content of the liquid crystal 320c can be 1 wt% to 5 wt% with respect to the total weight of the light conversion material.

[0218] When the content of the liquid crystal 320c is greater than 10 wt% with respect to the total amount of the light conversion material, a phenomenon in which the liquid crystals 320c are aggregated with each other in the solvent 320a can occur.

[0219] In particular, when the solvent 320a includes a non-polar solvent, the liquid crystals 320c having polarity can not be dispersed and can be aggregated with each other.

[0220] The content of the light-converting particles 320b and the liquid crystals 320c can be in different ranges of weight % with respect to the total weight of the light-converting material.

[0221] For example, the weight % of the light-converting particles 320b with respect to the total weight of the light-converting material can be greater or less than the weight % of the liquid crystals 320c with respect to the total weight of the light-converting material.

[0222] Specifically, the ratio of the weight % of the light-converting particles 320b with respect to the total weight of the light-converting material to the weight % of the liquid crystals 320c with respect to the total weight of the light-converting material can be 1:0.2 to 1:3.

[0223] When the ratio of the weight % of the light-converting particles 320b with respect to the total weight of the light-converting material to the weight % of the liquid crystals 320c with respect to the total weight of the light-converting material is less than 1:0.2, the content of the liquid crystals in the light-converting material is reduced, thereby increasing the viscosity of the light-converting material, and thus, reducing the driving speed of the light path control member.

[0224] In addition, when the ratio of the weight % of the light-converting particles 320b with respect to the total weight of the light-converting material to the weight % of the liquid crystals 320c with respect to the total weight of the light-converting material is greater than 1:3, the effect of increasing the driving speed is not significant compared to the amount of increase in the content of the liquid crystals in the light-converting material, and the liquid crystals can be aggregated with each other, thereby possibly causing the driving characteristics of the light path control member to deteriorate.

[0225] On the other hand, as described above, the solvent 320a can have polarity. When the solvent 320a has polarity, the dispersibility of the liquid crystals 320c disposed in the solvent 320a can be improved.

[0226] That is, since both the solvent 320a and the liquid crystals 320c have polarity, the aggregation of the liquid crystals 320c with each other in the solvent 320a can be minimized.

[0227] The polarity of the solvent 320a and the polarity of the liquid crystals 320c can be different from each other. Specifically, the polarity of the solvent 320a can be less than the polarity of the liquid crystals 320c.

[0228] The difference between the polarity of the solvent 320a and the polarity of the liquid crystals 320c can be 0.08 to 0.8.

[0229] When the difference between the polarity size of the solvent 320a and the polarity size of the liquid crystal 320c is less than 0.08, the moving speed of the light conversion material in the solvent can decrease as the polarity size of the solvent increases. In addition, when the difference between the polarity size of the solvent 320a and the polarity size of the liquid crystal 320c is greater than 0.8, the liquid crystals can aggregate with each other in the solvent due to the polarity difference between the solvent and the liquid crystal.

[0230] Hereinafter, referring to FIGS. 1 to 3, Figures 21 to 28 A manufacturing method of the light path control member of the embodiment will be described. The manufacturing method of the light path control member to be described later will be mainly described with respect to the case where the first substrate and the second substrate have the same size as shown in FIGS. 1 to 3. Figure 1 and Figure 2 The manufacturing method of the light path control member to be described later will be mainly described with respect to the case where the first substrate and the second substrate have the same size as shown in FIGS. 1 to 3.

[0231] Hereinafter, referring to FIGS. 1 to 3, Figure 21 The first substrate 110 and an electrode material for forming the first electrode are prepared. Next, the first electrode can be formed by applying 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. Thus, the first electrode 210 formed as a surface electrode can be formed on the first substrate 110.

[0232] Then, referring to FIGS. 1 to 3, Figure 22 The resin layer 350 can be formed by applying a urethane resin or an acrylic resin on the first electrode 210. Specifically, the resin layer 350 can be formed by applying the urethane resin or the acrylic resin on the first electrode 210.

[0233] At this time, the buffer layer 410 can be additionally disposed on the first electrode 210 before the resin layer 350 is disposed. Specifically, the adhesion of the resin layer 350 can be improved by disposing the resin layer 350 on the buffer layer 410 after the buffer layer 410 having good adhesion with the resin layer 350 is disposed on the first electrode 210.

[0234] For example, the buffer layer 410 can include an organic material having a lipophilic group such as -CH-, an alkyl group, or the like having good adhesion with the electrode and a hydrophilic group such as -NH, -OH, -COOH, or the like having good adhesion with the resin layer 350.

[0235] The resin layer 350 can be disposed on a partial area of the first substrate 110. That is, the resin layer 350 can be disposed in an area smaller than the area of the first substrate 110. Thus, an area in which the resin layer 350 is not disposed and the first electrode 210 is exposed can be formed on the first substrate 110. In addition, when the buffer layer 410 is disposed on the first electrode 210, an area in which the buffer layer 410 is exposed can be formed.

[0236] Then, referring to FIGS. 1 to 3, Figure 23The resin layer 350 can be patterned to form a plurality of the partition portions 310 and a plurality of the receiving portions 320 in the resin layer 350. Specifically, concave portions can be formed in the resin layer 350 to form the concave receiving portions 320 and the convex partition portions 310 between the concave portions.

[0237] Accordingly, the light conversion unit 300 including the partition portions 310 and the receiving portions 320 can be formed on the first substrate 110.

[0238] In addition, the buffer layer 410 exposed on the first electrode 210 can be removed to expose the first electrode 210 in the area in which the first substrate 110 protrudes.

[0239] Then, referring to Figure 24 , the second substrate 120 and an electrode material for forming the 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, the second electrode 220 formed as a surface electrode can be formed on the second substrate 120.

[0240] The size of the second substrate 120 can be smaller than the size of the first substrate 110. In addition, the size of the second substrate 120 can be smaller than the size of the resin layer 350.

[0241] Specifically, the size of the second length of the second substrate 120 extending in the first direction can be greater than the size of the third length of the resin layer 350 extending in the first direction, and the size of the second width of the second substrate 120 extending in the second direction can be smaller than the size of the third width of the resin layer 350 extending in the second direction.

[0242] Then, referring to Figure 25 The adhesive layer 420 can be formed by coating an adhesive material on the second electrode 220. Specifically, a light-transmissive adhesive layer capable of transmitting light can be formed on the second electrode 220. For example, the adhesive layer 420 can include an optically clear adhesive (OCA).

[0243] The adhesive layer 420 can be disposed in a partial area of the light conversion unit 300. That is, the adhesive layer 420 can be disposed in an area smaller than the area of the light conversion unit 300. Accordingly, an area in which the adhesive layer 420 is not disposed and the light conversion unit 300 is exposed can be formed on the light conversion unit 300.

[0244] Then, referring to Figure 26 The first substrate 110 and the second substrate 120 can be adhered. Specifically, the second substrate 120 can be disposed on the light conversion unit 300, and the second substrate 120 and the light conversion unit 300 can be adhered by the adhesive layer 420 disposed under the second substrate 120.

[0245] 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.

[0246] At this time, the second substrate 120 is configured to have a size smaller than that of the resin layer 350, and thus the plurality of partition portions 310 and the accommodation portions 320 can be exposed in a region of the light conversion unit 300 where the second substrate 120 is not disposed.

[0247] Specifically, the second substrate 120 has a second width extending in the second direction, and the size of the second width is smaller than that of a third width of the resin layer 350 extending in the second direction, and thus the plurality of partition walls 310 and the accommodation portions 320 can be exposed in an end region of at least one of one end portion and the other end portion of the resin layer 350 facing in the width direction.

[0248] Then, a light conversion material 380 can be injected between the partition portions 310, i.e., in the accommodation portions 320. Specifically, a light conversion material in which light-absorbing particles such as carbon black are dispersed in an electrolyte solvent including a paraffin-based solvent or the like can be injected between the partition portions, i.e., in the accommodation portions 320.

[0249] For example, after a dam extending in the length direction of the light conversion unit 300 is disposed on the accommodation portions and the partition portions of the light conversion unit 300 where the second substrate 120 is not disposed, an electrolyte solvent can be injected into the accommodation portions 320 by a capillary injection method between the dam and the side surface of the light conversion unit 300.

[0250] Then, referring to Figure 27 One light path control member can be manufactured by cutting the light conversion unit 300. Specifically, the light conversion unit 300 can be cut in the length direction of the light conversion unit 300. That is, the light conversion unit 300, the buffer layer 410, the first electrode 210, and the first substrate 110 located below the light conversion unit 300 can be cut along the dotted line shown in Figure 22 . A plurality of light path control members A, B, Figure 23 is a view showing one of the plurality of light path control members.

[0251] Specifically, the light conversion unit 300 can be cut such that the side surface of the light conversion unit 300 in the width direction and the first substrate 110 and the second substrate 120 are disposed on the same plane, or such that both end portions of the second substrate in the second direction are disposed on a cross section perpendicular to both end portions of the light conversion unit in the second direction.

[0252] Thus, both end portions of the second substrate 120, the second electrode 220, or the adhesive layer 420 in the second direction and both end portions of the light conversion unit 300 in the second direction can be disposed on the same plane.

[0253] That is, both end portions of the adhesive layer 420 in the second direction can be connected to both end portions of the light conversion unit 300 in the second direction.

[0254] Alternatively, both end portions of the second substrate 120, the second electrode 220, or the adhesive layer 420 in the second direction can be configured to be closer to the outer side than both end portions of the light conversion unit 300 in the second direction due to errors in the process.

[0255] Then, the buffer layer 410 disposed on the first substrate 110 and / or the adhesive layer 420 disposed under the second substrate 120 can be partially removed to form a connection portion in which an electrode is exposed. Specifically, when the first electrode of the light conversion unit 300 is not disposed on the upper surface of the first substrate 110 with the buffer layer 410 disposed thereon, the first connection portion 211 can be formed on the first substrate 110 by removing a portion of the first buffer layer 410 to expose the first electrode 210 or by not disposing the buffer layer 410 on the first electrode of the light conversion unit 300 from the beginning. In addition, when the second electrode of the light conversion unit 300 is not disposed on the lower surface of the second substrate 120 with the adhesive layer 420 disposed thereon, the second connection portion 221 can be formed under the second substrate 120 by removing a portion of the adhesive layer 420 or by not disposing the adhesive layer on the second electrode of the light conversion unit 300 during the adhesion process.

[0256] The printed circuit board or the flexible printed circuit board can be connected to the connection portion by, for example, anisotropic conductive film (ACF), and the printed circuit board can be connected to an external power source to apply a voltage to the light path control member.

[0257] Then, referring to Figure 28 The sealing portion 500 can be disposed by a sealing material. Specifically, the sealing portion 500 can be configured to be in contact with each side surface of the light path control member extending in the first direction, each side surface of the light path control member extending in the second direction, and the upper and lower portions of the light path control member.

[0258] Alternatively, the sealing portion 500 can be configured to be in contact with each side surface of the light path control member extending in the first direction and the upper and lower portions of the light path control member.

[0259] Therefore, by sealing the outwardly exposed receiving portion from the outside using the sealing portion 500, that is, by sealing the dispersion liquid in which the light conversion particles are dispersed from the outside, denaturation of the light conversion particles due to moisture, oxygen, or the like from the outside can be prevented.

[0260] The present application will be described in detail below by examples and comparative examples of the light path control member. These examples are only for a more detailed description of the present application. Therefore, the present application is not limited to these examples.

[0261] Example 1

[0262] After the first electrode is disposed on the first substrate, a resin layer is formed on the first electrode. At this time, the resin layer contains an acrylic resin.

[0263] Then, the resin layer is patterned to form a light conversion unit including a partition portion and a housing portion between the partition portions on the resin layer.

[0264] Next, after the second electrode is disposed on the second substrate, an adhesive layer is disposed on the second electrode, and the second electrode is adhered to the light conversion unit.

[0265] Then, after a bank portion is formed apart from one end portion and the other end portion of the housing portion, a light conversion material is injected through a space between the bank portion and the housing portion.

[0266] At this time, the light conversion material contains a solvent, carbon black, and a dispersant.

[0267] Then, a first contact angle θ1 between the light conversion material and a contact surface of the housing portion and a second contact angle θ2 between the light conversion material and the adhesive layer are measured.

[0268] Example 2

[0269] A light path control member was manufactured in the same manner as Example 1 except that different component ratios of the light conversion material as shown in Table 1 were used, and a first contact angle θ1 between the light conversion material and a contact surface of the housing portion and a second contact angle θ2 between the light conversion material and the adhesive layer were measured.

[0270] Example 3

[0271] A light path control member was manufactured in the same manner as Example 1 except that different component ratios of the light conversion material as shown in Table 1 were used, and a first contact angle θ1 between the light conversion material and a contact surface of the housing portion and a second contact angle θ2 between the light conversion material and the adhesive layer were measured.

[0272] Example 4

[0273] The light path control member was manufactured in the same manner as in Example 1 except that the component ratio of the different light conversion materials as shown in Table 1 was used, and the first contact angle θ1 between the light conversion material and the contact surface of the housing portion and the second contact angle θ2 between the light conversion material and the adhesive layer were measured.

[0274] Comparative Example 1

[0275] The light path control member was manufactured in the same manner as in Example 1 except that the component ratio of the different light conversion materials as shown in Table 1 and the dielectric constant of the solvent were used, and the first contact angle θ1 between the light conversion material and the contact surface of the housing portion and the second contact angle θ2 between the light conversion material and the adhesive layer were measured.

[0276] Comparative Example 2

[0277] The light path control member was manufactured in the same manner as in Example 1 except that the component ratio of the different light conversion materials as shown in Table 1 and the dielectric constant of the solvent were used, and the first contact angle θ1 between the light conversion material and the contact surface of the housing portion and the second contact angle θ2 between the light conversion material and the adhesive layer were measured.

[0278] Comparative Example 3

[0279] The light path control member was manufactured in the same manner as in Example 1 except that the component ratio of the different light conversion materials as shown in Table 1 and the dielectric constant of the solvent were used, and the first contact angle θ1 between the light conversion material and the contact surface of the housing portion and the second contact angle θ2 between the light conversion material and the adhesive layer were measured.

[0280] Comparative Example 4

[0281] The light path control member was manufactured in the same manner as in Example 1 except that the component ratio of the different light conversion materials as shown in Table 1 and the dielectric constant of the solvent were used, and the first contact angle θ1 between the light conversion material and the contact surface of the housing portion and the second contact angle θ2 between the light conversion material and the adhesive layer were measured.

[0282] Table 1:

[0283]

[0284]

[0285] Referring to Table 1, in the light conversion material of the light path control member of the example, both the first contact angle θ1 and the second contact angle θ2 had a value of 20° or less, and thus it was confirmed that both the resin layer and the adhesive layer had a hydrophobicity similar to that of the dispersion liquid.

[0286] Accordingly, it can be confirmed that the filling property of the light conversion material of the example is improved.

[0287] On the other hand, in the light conversion material of the light path control member of Comparative Examples 1 to 3, at least one of the first contact angle θ1 and the second contact angle θ2 has a value greater than 20°, and thus, it can be confirmed that any one of the resin layer and the adhesive layer has a hydrophilicity different from that of the dispersion liquid.

[0288] Accordingly, it can be confirmed that the filling property of the light conversion material of Comparative Examples 1 to 3 is deteriorated.

[0289] In addition, with reference to Comparative Example 4, it can be confirmed that when the difference between the first contact angle θ1 and the second contact angle θ2 is greater than 10°, the filling property is deteriorated due to the difference in the filling speed of the light conversion material in contact with the adhesive layer and the resin layer.

[0290] Hereinafter, with reference to Figures 29 to 33 A display device to which the light path control member of the embodiment is applied will be described.

[0291] With reference to Figure 29 and Figure 30 , the light path control member 1000 of the embodiment can be disposed on or under the display panel 2000.

[0292] The display panel 2000 and the light path control member 1000 can be disposed to be adhered to each other. For example, the display panel 2000 and the light path control member 1000 can be adhered to each other by the adhesive layer 1500. The adhesive layer 1500 can be transparent. For example, the adhesive layer 1500 can include an adhesive or an adhesive layer having an optically transparent adhesive material.

[0293] The adhesive layer 1500 can include a release film. Specifically, when the light path control member is adhered to the display panel, the light path control member and the display panel can be adhered after the release film is removed.

[0294] On the other hand, with reference to Figure 29 and Figure 30 , one end portion or one end portion and the other end portion of the light path control member can protrude, and the light conversion unit can not be disposed in the protruding portion. The protruding area is an electrode connection portion in which the first electrode 210 and the second electrode 220 are exposed, and an external printed circuit board and the light path control member can be connected through the electrode connection portion.

[0295] 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, a light path control component may be formed under the liquid crystal panel. That is, when the surface of the liquid crystal panel viewed by the user is defined as the upper part of the liquid crystal panel, the light path control component may be disposed under the liquid crystal panel. The display panel 2000 may be formed in a structure in which a first substrate 2100 including thin-film transistors (TFTs) and pixel electrodes and a second substrate 2200 including a color filter layer are bonded to each other with a liquid crystal layer interposed therebetween.

[0296] Alternatively, the display panel 2000 can be a liquid crystal display panel with a transistor-on-a-filter (COT) structure, where a thin-film transistor, a color filter, and a black electrolyte are formed on the first substrate 2100, and the second substrate 2200 is bonded to the first substrate 2100 with a liquid crystal layer interposed therebetween. That is, a thin-film transistor can be formed on the first substrate 2100, a protective film can be formed on the thin-film transistor, and a color filter layer can be formed on the protective film. Additionally, pixel electrodes that contact the thin-film transistors can be formed on the first substrate 2100. In this case, to improve the aperture ratio and simplify the masking process, the black electrolyte can be omitted, and the common electrode can be formed to function as the black electrolyte.

[0297] In addition, when the display panel 2000 is a liquid crystal display panel, the display device may also include a backlight unit 3000 that provides light from the rear surface of the display panel 2000.

[0298] That is, such as Figure 29 As shown, the light path control component can be configured below the liquid crystal panel and on the backlight unit 3000, and the light path control component can be configured between the backlight unit 3000 and the display panel 2000.

[0299] Or, such as Figure 30 As shown, when the display panel 2000 is an organic light-emitting diode (OLED) panel, a light path control component can be formed on the OLED panel. That is, when the surface of the OLED panel viewed by the user is defined as the upper part of the OLED panel, the light path control component can be disposed on the OLED panel. The display panel 2000 may include self-emissive elements that do not require a separate light source. In the display panel 2000, thin-film transistors can be formed on the first substrate 2100, and organic light-emitting elements in contact with the thin-film transistors can be formed. The organic light-emitting element 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 configured to serve as an encapsulation substrate for encapsulation may be further included on the organic light-emitting element.

[0300] That is, light emitted from the display panel 2000 or the backlight unit 3000 can move from the second substrate 120 of the light path control part to the first substrate 110.

[0301] In addition, although not shown in the drawings, a polarizing plate can be further disposed between the light path control part 1000 and the display panel 2000. The polarizing plate can be a linear polarizing plate or an anti-ambient light reflection polarizing plate. For example, when the display panel 2000 is a liquid crystal display panel, the polarizing plate can be a linear polarizing plate. Further, when the display panel 2000 is an organic light emitting diode panel, the polarizing plate can be an anti-ambient light reflection polarizing plate.

[0302] In addition, an additional functional layer 1300 such as an anti-reflection layer, an anti-glare layer, etc. can be further disposed on the light path control part 1000. Specifically, the functional layer 1300 can be adhered to one surface of the first substrate 110 of the light path control part. Although not shown in the drawings, the functional layer 1300 can be adhered to the first substrate 110 of the light path control part through an adhesive layer. In addition, a release film for protecting the functional layer can be further disposed on the functional layer 1300.

[0303] Further, a touch panel can be further disposed between the display panel and the light path control part.

[0304] It is shown in the drawings that the light path control part is disposed at the upper portion of the display panel, but the embodiment is not limited thereto, and the light path control part can be disposed at various positions such as a position where light can be adjusted, i.e. the lower portion of the display panel or between the second substrate and the first substrate of the display panel, etc.

[0305] In addition, it is shown in the drawings that the light conversion unit of the light path control part of the embodiment is located in a direction parallel to 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. Thereby, a moire phenomenon generated between the display panel and the light path control part can be reduced.

[0306] Referring to Figures 31 to 33 , the light path control part of the embodiment can be applied to various display apparatuses.

[0307] Referring to Figures 31 to 33 , the light path control part of the embodiment can be applied to a display apparatus displaying a screen.

[0308] For example, when a power source is applied to the light path control part as shown in Figure 31 , the accommodation part functions as a light transmission part, and thus the display apparatus can be driven in a sharing mode, and when a power source is not applied to the light path control part as shown in Figure 32 , the accommodation part functions as a light blocking part, and thus the display apparatus can be driven in a privacy mode.

[0309] Accordingly, the user can easily drive the display device in the privacy mode or the normal mode by applying the power.

[0310] Light emitted from the backlight unit or the self-emitting element can move from the first substrate to the second substrate. Alternatively, light emitted from the backlight unit or the self-emitting element can move from the second substrate to the first substrate.

[0311] In addition, referring to Figure 33 , the display device to which the light path control means of the embodiments is applied can also be applied to the interior of a vehicle.

[0312] For example, the display device to which the light path control means of the embodiments is applied can display a video confirming information of a vehicle and a moving path of the vehicle. The display device can be disposed between a driver seat and a passenger seat of the vehicle.

[0313] In addition, the light path control means of the embodiments can be applied to an instrument panel displaying a speed, an engine, an alarm signal, etc. of a vehicle.

[0314] Further, the light path control means of the embodiments can be applied to a front glass (FG) or right and left window glasses of a vehicle.

[0315] The above-described characteristics, structures, and effects described in the embodiments are included in at least one embodiment of the present application, but are not limited to only one embodiment. In addition, a person skilled in the art can combine or change the characteristics, structures, and effects described in each embodiment into other embodiments. Therefore, it should be understood that these combinations and changes belong to the scope of the present application.

[0316] In addition, the above has been described mainly with the embodiments, but these embodiments are only examples, and the present application is not limited thereto, and a person skilled in the art can implement various changes and applications not shown above within the scope of the essential characteristics of the embodiments. For example, each constituent element specifically shown in the embodiments can be changed. In addition, it should be interpreted that the difference regarding such changes and applications belongs to the scope of the present application defined by the attached claims.

Claims

1. A light path control member comprising: 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; a light conversion unit disposed between the first electrode and the second electrode; and an adhesive layer disposed between the light conversion unit and the second electrode, wherein the light conversion unit includes a partition portion and a housing portion alternately disposed, a dispersion liquid that changes a light transmittance is disposed inside the housing portion, the dispersion liquid is disposed in direct contact with a bottom surface and an inner surface of the housing portion and a lower surface of the adhesive layer, a first contact angle between the dispersion liquid and the bottom surface and the inner surface of the housing portion is 20° or less, a second contact angle between the dispersion liquid and the lower surface of the adhesive layer is 20° or less, a difference between the first contact angle and the second contact angle is 1° to 10°. 2.The light path control member according to claim 1, wherein the dispersion liquid has a hydrophobic property inside the housing portion. 3.The light path control member according to claim 1, wherein the first contact angle is 5° to 20°, the second contact angle is 3° to 15°. 4.The light path control member according to claim 1, wherein the dispersion liquid includes a solvent, light conversion particles, and a dispersant, a content of the solvent is 89.5 wt% to 94.7 wt% with respect to a total amount of the dispersion liquid, a content of the light conversion particles is 1 wt% to 3.5 wt% with respect to the total amount of the dispersion liquid, a content of the dispersant is 1 wt% to 1.8 wt% with respect to the total amount of the dispersion liquid. 5.The light path control member according to claim 4, wherein a surface of the light conversion particles is negatively charged, the light conversion particles are moved by applying a voltage in any one of the first electrode and the second electrode. 6.The light path control member according to claim 4, wherein a dielectric constant of the solvent is 1 to 7.

5. 7.The light path control member according to claim 1, wherein the first contact angle is larger than the second contact angle. 8.The light path control member according to claim 1, wherein the first contact angle is defined as an angle between a surface of a droplet of the dispersion liquid and the bottom surface and the inner surface of the housing portion when the dispersion liquid is dropped on the bottom surface and the inner surface of the housing portion, the second contact angle is defined as an angle between a surface of a droplet of the dispersion liquid and the lower surface of the adhesive layer when the dispersion liquid is dropped on the lower surface of the adhesive layer. 9.The light path control member according to claim 1, wherein the first contact angle is 8° to 15°, and the second contact angle is 5° to 10°. 10.The light path control member according to claim 1, wherein a difference between the first contact angle and the second contact angle is 3° to 5°. 11.A display device comprising: a display panel; and the light path control member according to claim 1 disposed on the display panel. ​ ​ 12. The display device according to claim 11, wherein the dispersion liquid has a hydrophobicity inside the housing.

13. The display device according to claim 11, wherein the first contact angle is 5 to 20°, and the second contact angle is 3 to 15°.

14. The display device according to claim 11, wherein the dispersion liquid contains a solvent, light-converting particles, and a dispersant, a content of the solvent is 89.5 to 94.7 wt% with respect to the total amount of the dispersion liquid, a content of the light-converting particles is 1 to 3.5 wt% with respect to the total amount of the dispersion liquid, and a content of the dispersant is 1 to 1.8 wt% with respect to the total amount of the dispersion liquid.

15. The display device according to claim 14, wherein a dielectric constant of the solvent is 1 to 7.5.

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