Light path control component and display device including the same

Abstract

According to the embodiment, the optical path control component includes: a first substrate; a first electrode, which is arranged on the first substrate; a light conversion part, which is arranged on the first electrode; a second substrate, which is arranged on the first substrate; a second electrode, which is arranged below the second substrate; and an adhesive layer, which is arranged between the light conversion part and the second electrode, wherein the light conversion part includes alternately arranged partition wall parts and receiving parts, the light transmittance of the receiving part changes according to the application of voltage, the upper surface of the partition wall part is in contact with the adhesive layer, and the light conversion part is formed by a photocurable resin, the photocurable resin contains oligomers, monomers, photopolymerization initiators and additives, and the additives contain 1.5wt% to 3.0wt% of an antistatic agent.

Description

Technical Field

[0001] The embodiment relates to a light path control member and a display device including the same. Background Art

[0002] The shading film blocks the transmission of light from the light source and is attached to the front of the display panel so that when the display outputs the image, the shading film adjusts the viewing angle of the light according to the incident angle of the light to present clear image quality at the viewing angle required by the user, wherein the display panel is a display device for mobile phones, laptop computers, tablet computers, car navigation devices, vehicle touch controls, etc.

[0003] In addition, the light-shielding film may be used for windows of vehicles, buildings, etc. to partially block external light to prevent glare or to prevent the interior from being seen from the outside.

[0004] That is, the light shielding film can be a light path control member that controls the moving path of light to block light in a specific direction and transmit light in a specific direction. Therefore, by controlling the transmission angle of light using the light shielding film, the user's viewing angle can be controlled.

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

[0006] Such a switchable light shielding film can be realized by filling the interior of a pattern portion with particles that can move when a voltage is applied and a dispersion liquid for dispersing the particles and switching the pattern portion between a light transmitting portion and a light shielding portion by dispersing and aggregating the particles.

[0007] In order to prevent the overflow of the filler, a photocurable resin may be used to manufacture a light conversion part having a partition wall part. In this case, the photocurable resin may contain additives for improving release properties or electrical properties. These additives may move on the surface of the resin, and thus there is a problem that the optical properties of the resin may deteriorate over time, and the adhesion between the resin and the adhesive layer may deteriorate.

[0008] Therefore, there is a need for an optical path control member having a new structure that can solve the above-mentioned problems. Summary of the invention

[0009] Technical issues

[0010] Embodiments are directed to a light path control member having improved reliability by improving adhesive properties. In addition, embodiments may provide a light path control member having improved optical properties.

[0011] Technical Solution

[0012] According to the embodiment, the optical path control component includes: a first substrate; a first electrode, which is arranged on the first substrate; a light conversion part, which is arranged on the first electrode; a second substrate, which is arranged on the first substrate; a second electrode, which is arranged below the second substrate; and an adhesive layer, which is arranged between the light conversion part and the second electrode, wherein the light conversion part includes alternately arranged partition wall parts and receiving parts, and the receiving part has a light transmittance that changes according to the application of voltage, the upper surface of the partition wall part is in contact with the adhesive layer, and the light conversion part is formed by a photocurable resin, and the photocurable resin contains oligomers, monomers, photopolymerization initiators and additives, and the additives contain 2.0wt% to 3.0wt% of antistatic agents.

[0013] Beneficial Effects

[0014] The light path controlling member according to the embodiment may improve the adhesive property of the adhesive layer bonding the first substrate and the second substrate.

[0015] The embodiment can improve the adhesion between the partition wall portion and the adhesive layer by changing the composition of the photocurable resin used to accommodate the photoconversion material and prevent the overflow of the photoconversion material. Specifically, the embodiment can reduce the content of the additive included to improve the release and electrical properties of the photocurable resin. Therefore, the embodiment can prevent the film detachment and separation between the partition wall portion and the adhesive layer that occurs according to the movement of the additive contained in the resin.

[0016] In addition, the embodiment can prevent the degradation of optical properties caused by the additive in the photocurable resin moving to the surface of the photocurable resin over time. That is, the embodiment can prevent the haze from changing over time by optimizing the material for forming the partition wall and the content of the additive.

[0017] Therefore, the optical characteristics and durability of the light path control member and the display device including the light path control member can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 and 2 is a perspective view of a light path control member according to an embodiment;

[0019] 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 according to an embodiment;

[0020] Figure 5 is along Figure 1 A cross-sectional view taken along line AA';

[0021] Figures 6 to 9 is along Figure 1 The cross-sectional view taken along line AA' is used to describe the shapes of various receiving portions in the light path control member according to the embodiment;

[0022] Fig.10 is a view showing an example of the principle of adhesion of an additive to the surface of a partition wall portion in a dispersion;

[0023] Fig.11 It is a schematic diagram of the dispersion of carbon black and the formation of micelles;

[0024] Fig.12 a is a view showing a part of a head and a tail according to the type of surfactant, Fig.12 b is a view showing an example of a surfactant;

[0025] Fig.13 is a view showing an example of a micellar form of a nonionic surfactant and a micellar form of an anionic surfactant;

[0026] Figures 14 to 20 is a view for explaining a method of manufacturing a light path control member according to an embodiment;

[0027] Figure 21 to Figure 22 is a cross-sectional view of a display device to which the light path control member according to the embodiment is applied;

[0028] Figure 23 to Figure 25 is a view for explaining one embodiment of a display device to which the light path control member according to the embodiment is applied. DETAILED DESCRIPTION

[0029] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the technical concept and scope of the present invention are not limited to some of the described embodiments, but can be implemented in different forms, and within the technical concept and scope of the present invention, one or more components in the embodiments can be selectively combined and replaced.

[0030] In addition, unless otherwise clearly defined and described, the terms (including technical terms and scientific terms) used in the embodiments of the present invention may be interpreted as having the same meaning as that commonly understood by ordinary technicians in the field to which the present invention belongs, and terms such as those defined in commonly used dictionaries may be interpreted as having a meaning consistent with their meaning in the context of the relevant technology.

[0031] In addition, the terms used in the embodiments of the present invention are used to describe the embodiments and are not intended to limit the present invention. In this specification, unless otherwise specified in the wording, a singular form may also include a plural form, and when described as "at least one (or more) of A (and), B and C", it may include at least one of all combinations that can be combined in A, B, C.

[0032] In addition, when describing the elements of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish an element from other elements, and these terms do not limit the nature, order, or sequence of the elements.

[0033] In addition, when an element is described as being “connected” or “coupled” to another element, it may include not only the case where the element is directly “connected” or “coupled” to the other element, but also the case where the element is “connected” or “coupled” to the other element through another element between the element and the other element.

[0034] In addition, when described as being formed or arranged "on" or "under" each element, "on" or "under" may include not only the case where two elements are directly connected to each other, but also the case where one or more other elements are formed or arranged between the two elements.

[0035] In addition, when expressed as “upper (above)” or “lower (lower)”, it may include not only an upper direction based on one element but also a lower direction based on one element.

[0036] Hereinafter, a light path control member according to an embodiment will be described with reference to the accompanying drawings. The light path control member described below relates to a switchable light path control member driven in various modes according to the movement of electrophoretic particles by application of voltage.

[0037] refer to Figures 1 to 4 , the light path control member according to the embodiment includes a first substrate 110 , a second substrate 120 , a first electrode 210 , a second electrode 220 , and a light conversion part 300 .

[0038] The first substrate 110 may support the first electrode 210. The first substrate 110 may be rigid or flexible.

[0039] In addition, the first substrate 110 may be transparent. For example, the first substrate 110 may include a transparent substrate capable of transmitting light.

[0040] The first substrate 110 may include glass, plastic or a flexible polymer film. For example, the flexible polymer film may be made of any one of polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyether sulfone (PES), cyclic olefin copolymer (COC), triacetyl cellulose (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film and polystyrene (PS), which are only examples, but the embodiment is not limited thereto.

[0041] In addition, the first substrate 110 may be a flexible substrate having a flexible property.

[0042] In addition, the first substrate 110 may be a curved or bent substrate. That is, the light path control member including the first substrate 110 may also be formed to have flexible, curved or bent characteristics. Therefore, the light path control member according to the embodiment may be changed to various designs.

[0043] The first substrate 110 may extend in the first direction 1A, the second direction 2A, and the third direction 3A.

[0044] In detail, the first substrate 110 may include: a first direction 1A, the first direction 1A corresponds to the length direction or the width direction of the first substrate 110; a second direction 2A, the second direction 2A extends in a direction different from the first direction 1A and corresponds to the length direction or the width direction of the first substrate 110; and a third direction 3A, the third direction 3A extends in a direction different from the first direction 1A and the second direction 2A and corresponds to the thickness direction of the first substrate 110.

[0045] For example, the first direction 1A may be defined as the length direction of the first substrate 110, the second direction 2A may be defined as the width direction of the first substrate 110 perpendicular to the first direction 1A, and the third direction 3A may be defined as the thickness direction of the first substrate 110. Alternatively, the first direction 1A may be defined as the width direction of the first substrate 110, the second direction 2A may be defined as the length direction of the first substrate 110 perpendicular to the first direction 1A, and the third direction 3A may be defined as the thickness direction of the first substrate 110.

[0046] Hereinafter, for convenience of description, the first direction 1A will be described as the length direction of the first substrate 110 , the second direction 2A will be described as the width direction of the first substrate 110 , and the third direction 3A will be described as the thickness direction of the first substrate 110 .

[0047] The first electrode 210 may be disposed on one surface of the first substrate 110. In detail, the first electrode 210 may be disposed on an upper surface of the first substrate 110. That is, the first electrode 210 may be disposed between the first substrate 110 and the second substrate 120.

[0048] The first electrode 210 may include a transparent conductive material. For example, the first electrode 210 may include a conductive material having a light transmittance of about 80% or more.

[0049] For example, the first electrode 210 may include a metal oxide such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, or the like.

[0050] The first electrode 210 may have a thickness of 0.05 μm to 2 μm.

[0051] Alternatively, the first electrode 210 may include various metals to achieve low resistance. For example, the first electrode 210 may include at least one metal selected from chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), titanium (Ti), and alloys thereof.

[0052] refer to Figure 3 , the first electrode 210 may be provided on the entire surface of one surface of the first substrate 110. In detail, the first electrode 210 may be provided as a surface electrode on one surface of the first substrate 110. However, the embodiment is not limited thereto, and the first electrode 210 may be formed of a plurality of pattern electrodes having a uniform pattern such as a mesh or stripe shape.

[0053] For example, the first electrode 210 may include a plurality of conductive patterns. In detail, the first electrode 210 may include a plurality of mesh lines crossing each other and a plurality of mesh openings formed by the mesh lines.

[0054] Therefore, even if the first electrode 210 includes metal, the first electrode 210 is not visually recognized from the outside, so that visibility can be improved. In addition, light transmittance is increased by the opening, so that the brightness of the light path control member according to the embodiment can be improved.

[0055] The second substrate 120 may be disposed on the first substrate 110. In detail, the second substrate 120 may be disposed on the first electrode 210 on the first substrate 110.

[0056] The second substrate 120 may include a material capable of transmitting light. The second substrate 120 may include a transparent material. The second substrate 120 may include a material that is the same as or similar to that of the first substrate 110 described above.

[0057] For example, the second substrate 120 may include glass, plastic, or a flexible polymer film. For example, the flexible polymer film may be made of any one of polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyethersulfone (PES), cycloolefin copolymer (COC), TAC (triacetyl cellulose) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, and polystyrene (PS). This is only an example, and embodiments are not necessarily limited thereto.

[0058] In addition, the second substrate 120 may be a flexible substrate having a flexible property.

[0059] In addition, the second substrate 120 may be a curved or bent substrate. That is, the light path control member including the second substrate 120 may also be formed to have flexible, curved or bent characteristics. Therefore, the light path control member according to the embodiment may be changed to various designs.

[0060] The second substrate 120 may also extend in the first direction 1A, the second direction 2A, and the third direction 3A in the same manner as the first substrate 110 described above.

[0061] In detail, the second substrate 120 may include: a first direction 1A, the first direction 1A corresponds to the length direction or the width direction of the second substrate 120; a second direction 2A, the second direction 2A extends in a direction different from the first direction 1A and corresponds to the length direction or the width direction of the second substrate 120; and a third direction 3A, the third direction 3A extends in a direction different from the first direction 1A and the second direction 2A and corresponds to the thickness direction of the second substrate 120.

[0062] For example, the first direction 1A may be defined as a length direction of the second substrate 120 , the second direction 2A may be defined as a width direction of the second substrate 120 perpendicular to the first direction 1A, and the third direction 3A may be defined as a thickness direction of the second substrate 120 .

[0063] Alternatively, the first direction 1A may be defined as a width direction of the second substrate 120 , the second direction 2A may be defined as a length direction of the second substrate 120 perpendicular to the first direction 1A, and the third direction 3A may be defined as a thickness direction of the second substrate 120 .

[0064] Hereinafter, for convenience of explanation, the first direction 1A will be described as the length direction of the second substrate 120 , the second direction 2A will be described as the width direction of the second substrate 120 , and the third direction 3A will be described as the thickness direction of the second substrate 120 .

[0065] The second electrode 220 may be disposed on one surface of the second substrate 120. In detail, the second electrode 220 may be disposed on the lower surface of the second substrate 120. That is, the second electrode 220 may be disposed on one surface of the second substrate 120 where the second substrate 120 and the first substrate 110 face each other. That is, the second electrode 220 may be disposed to face the first electrode 210 on the first substrate 110. That is, the second electrode 220 may be disposed between the first electrode 210 and the second substrate 120.

[0066] The second electrode 220 may include a material that is the same as or similar to that of the first substrate 110 described above.

[0067] The second electrode 220 may include a transparent conductive material. For example, the second electrode 220 may include a conductive material having a light transmittance of about 80% or more. For example, the second electrode 220 may include a metal oxide such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, etc.

[0068] The second electrode 220 may have a thickness of about 0.1 μm to about 0.5 μm.

[0069] Alternatively, the second electrode 220 may include various metals to achieve low resistance. For example, the second electrode 220 may be at least one metal selected from chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), titanium (Ti), and alloys thereof.

[0070] refer to Figure 4 , the second electrode 220 may be provided on the entire surface of one surface of the second substrate 120. In detail, the second electrode 220 may be provided as a surface electrode on one surface of the second substrate 120. However, the embodiment is not limited thereto, and the second electrode 220 may be formed of a plurality of pattern electrodes having a uniform pattern such as a grid or stripe shape.

[0071] For example, the second electrode 220 may include a plurality of conductive patterns. In detail, the second electrode 220 may include a plurality of mesh lines crossing each other and a plurality of mesh openings formed by the mesh lines.

[0072] Therefore, even if the second electrode 220 includes metal, the second electrode 220 cannot be visually recognized from the outside, so that visibility can be improved. In addition, light transmittance is increased by the opening, so that the brightness of the light path control member according to the embodiment can be improved.

[0073] The first substrate 110 and the second substrate 120 may have sizes corresponding to each other. The first substrate 110 and the second substrate 120 may have sizes that are the same as or similar to each other.

[0074] In detail, a first length L2 of the first substrate 110 extending in the first direction 1A may have the same or similar size as a second length L2 of the second substrate 120 extending in the first direction 1A.

[0075] For example, the first length and the second length may have a dimension of 300 mm to 400 mm.

[0076] In addition, a first width of the first substrate 110 extending in the second direction 2A may have the same or similar size as a second width of the second substrate 120 extending in the second direction 2A.

[0077] For example, the first width and the second width may have a size of 150 mm to 200 mm.

[0078] Furthermore, a first thickness of the first substrate 110 extending in the third direction 3A may have the same or similar size as a second thickness of the second substrate 120 extending in the third direction 3A.

[0079] For example, the first thickness and the second thickness may have a size of 30 μm to 200 μm.

[0080] refer to Figure 1 , the first substrate 110 and the second substrate 120 may be disposed to be misaligned with each other.

[0081] In detail, the first substrate 110 and the second substrate 120 may be disposed at positions that are not aligned with each other in the first direction 1A. In detail, the first substrate 110 and the second substrate 120 may be disposed such that side surfaces of the substrates are not aligned with each other.

[0082] Therefore, the first substrate 110 may be disposed to protrude in one direction of the first direction 1A, and the second substrate 120 may be disposed to protrude in the other direction of the first direction 1A.

[0083] That is, the first substrate 110 may include a first protrusion protruding in one direction in the first direction 1A, and the second substrate 110 may include a second protrusion protruding in the other direction in the first direction 1A.

[0084] Therefore, the light path control member 1000 may include a region on the first substrate 110 exposing the first electrode 210 and a region under the second substrate 120 exposing the second electrode 220 .

[0085] That is, the first electrode 210 disposed on the first substrate 110 may be exposed at the first protrusion, and the second electrode 220 disposed under the second substrate 120 may be exposed at the second protrusion.

[0086] The first electrode 210 and the second electrode 220 exposed at the protrusion may be connected to an external printed circuit board through a pad portion to be described below.

[0087] Alternatively, refer to Figure 2 , the first substrate 110 and the second substrate 120 may be disposed at positions corresponding to each other. In detail, the first substrate 110 and the second substrate 120 may be disposed so that respective side surfaces correspond to each other.

[0088] Therefore, the first substrate 110 may be configured to protrude in one direction of the first direction 1A, and the second substrate 120 may also be configured to protrude in one direction of the first direction 1A, that is, the second substrate 120 may be configured to protrude in the same direction as the first substrate 110 .

[0089] That is, the first substrate 110 may include a first protrusion protruding in one direction in the first direction 1A, and the second substrate may also include a second protrusion protruding in one direction in the first direction 1A.

[0090] That is, the first protrusion and the second protrusion may protrude in the same direction.

[0091] Therefore, the light path control member 1000 may include a region where the first electrode 210 is exposed on the first substrate 110 and a region where the second electrode 220 is exposed under the second substrate 120 .

[0092] That is, the first electrode 210 disposed on the first substrate 110 may be exposed at the first protrusion, and the second electrode 220 disposed under the second substrate 120 may be exposed at the second protrusion.

[0093] The first electrode 210 and the second electrode 220 exposed at the protrusion may be connected to an external printed circuit board through a connection part to be described below.

[0094] The light conversion part 300 may be disposed between the first substrate 110 and the second substrate 120. In detail, the light conversion part 300 may be disposed between the first electrode 210 and the second electrode 220.

[0095] An adhesive layer or a buffer layer may be provided between the light conversion part 300 and the first substrate 110 or between the light conversion part 300 and the second substrate 120 , and the first substrate 110 , the second substrate 120 , and the light conversion part 300 may be bonded to each other through the adhesive layer and / or the buffer layer.

[0096] The light conversion part 300 may include a plurality of partition wall parts and a receiving part. Light conversion particles that move according to application of voltage may be disposed in the receiving part, and light transmission characteristics of the light path control member may be changed by the light conversion particles.

[0097] The size of the light change part 300 may be smaller than that of at least one of the first substrate 110 and the second substrate 120 .

[0098] In detail, the length of the light conversion part 300 in the first direction may be smaller than the length of at least one of the first substrate 110 and the second substrate 120 in the first direction.

[0099] In addition, the width of the light conversion portion 300 in the second direction may be the same as the width of at least one of the first substrate 110 and the second substrate 120 in the second direction, or the width of the light conversion portion 300 in the second direction may be smaller than the width of at least one of the first substrate 110 and the second substrate 120 in the second direction.

[0100] In addition, at least one of both ends of the first substrate 110 and the second substrate 120 in the first direction may be disposed outside both ends of the light conversion part 300 in the first direction.

[0101] Therefore, a sealing portion (not shown in the drawings) can be easily provided, and the adhesive property of the sealing portion can be improved.

[0102] Reference Figure 5 A light path controlling member according to an embodiment is described.

[0103] The light path control member according to the embodiment may include a light conversion material. For example, the light conversion material 320' may be an EPD ink. In order to accommodate the light conversion material 320' and prevent it from overflowing, a light conversion unit 300 may be used. The light conversion unit 300 may include a receiving unit for accommodating the light conversion material 320' and a partition wall unit 310 for preventing the light conversion material 320' from overflowing.

[0104] The light conversion unit 300 may be formed of a photocurable resin. For example, the light conversion unit 300 may be formed by imprinting a photocurable resin. That is, the partition wall unit 310 and the receiving unit 320 may be formed of a photocurable resin.

[0105] In detail, the partition wall portion 310 may include a resin material. For example, the partition wall portion 310 may include a photocurable resin material. For example, the partition wall portion 310 may include a urethane resin or the like.

[0106] The photocurable resin may include polyurethane acrylate, acrylate monomer, isobornyl acrylate, additives, photoinitiator and acryloylmorpholine. For example, the photoinitiator may include 1-hydroxycyclohexylphenyl ketone.

[0107] The photocurable resin may include an oligomer, a monomer, a photopolymerization initiator, and an additive. The photocurable resin may form a photoconversion part through a reaction of a polymer-type prepolymer, a polyfunctional monomer as a diluent, and a photopolymerization initiator.

[0108] Here, the additive may be various materials added to increase the driving speed of the device. For example, the additive may be a material applied to the photocurable resin to increase the driving speed of the EPD ink. Here, the additive may refer to various materials for improving the release properties or electrical properties of the photocurable resin. For example, the additive may refer to various materials including a release additive and / or an antistatic agent.

[0109] However, when such additives are added in excess, problems such as increased haze and reduced transmittance may occur at the interface of the resin layer. In addition, the additive has the property of moving to the surface of the resin over time. This movement of the additive may cause the problem of deterioration of the optical properties of the light path control member. In addition, the movement of the additive may deteriorate the adhesion between the additive and the partition wall portion.

[0110] In order to reduce the movement of the additive, the embodiment can optimize the content of the additive included in the photocurable resin forming the partition wall portion. Therefore, the embodiment can improve the optical characteristics by reducing the haze and increasing the transmittance. In addition, the embodiment can improve the bonding force between the bonding layer and the partition wall portion by optimizing the content of the additive.

[0111] Referring to Table 1, changes in haze and transmittance according to the types and contents of additives in Examples 1 to 3 will be described.

[0112] When the weight of the photocurable resin is 100wt%, the additive may include an amount of 5.0wt% or less. Specifically, when the photocurable resin is 100wt%, the additive may include an amount of 2.0wt% to 3.0wt%. In an embodiment, since the content of the additive in the photocurable resin is 5.0wt% or less, the amount of the additive moving to the resin surface can be reduced.

[0113] The additive may include an antistatic agent in an amount of 1.5 wt % to 3.0 wt %. For example, the additive may include an antistatic agent in an amount of 2.0 wt % to 3.0 wt %. For example, the additive may include an antistatic agent in an amount of 2.4 wt % to 2.7 wt %.

[0114] In Embodiment 1, the photocurable resin forming the light conversion part may include an antistatic agent as an additive in an amount of 2.0 wt % to 3.0 wt %.

[0115] Antistatic agents can be included in photocurable resins to improve electrical conductivity. Antistatic agents can help improve electrical conductivity by reducing volume resistance and surface resistance. Antistatic agents can use materials or ionic compounds with high charge mobility to achieve antistatic effects by moving charges accumulated on the surface or inside the component to external conductive materials (moisture). In other words, antistatic agents can improve the driving characteristics of charges transferred to the surface.

[0116] When the content of the antistatic agent in the photocurable resin is 2.0wt% to 3.0wt%, the additive can be prevented from moving to the resin surface, thereby reducing haze. Specifically, when the content of the antistatic agent in the photocurable resin is 2.0wt% to 3.0wt%, the haze can be 9% or less.

[0117] For example, the photocurable resin of the embodiment may contain 2.0 wt % to 3.0 wt % of the antistatic agent, so that the haze may be 5% or less. For example, the photocurable resin of the embodiment may contain 2.0 wt % to 3.0 wt % of the antistatic agent, so that the haze may be 3% or less.

[0118] When the content of the antistatic agent in the photocurable resin is 2.0wt% to 3.0wt%, the lateral transmittance of the light path control member and the display device including the same can be increased. In an embodiment, the content of the antistatic agent in the photocurable resin can be 2.0wt% to 3.0wt%, thereby increasing the lateral transmittance to 30% or more. Specifically, in an embodiment, the content of the antistatic agent in the photocurable resin can be 2.0wt% to 3.0wt%, thereby increasing the lateral transmittance to 33% to 37%.

[0119] Here, the side transmittance may be measured in a share mode, and the side transmittance may refer to a brightness value measured when the device is located at 45 degrees. In other words, the side transmittance is a brightness value of the device at a 45-degree position measured in a measuring device.

[0120] In detail, the lateral transmittance of the light path control member is defined as the light transmittance measured by (B / A)*100 after measuring the brightness of light (A) and the brightness of light (B), where the brightness of light (A) is the brightness of light emitted from the light source when the light path control member is not set, and the brightness of light (B) is the brightness of light emitted at an angle of 45° through the light path control member in the light source when the light path control member is set on the light source.

[0121] When the content of the antistatic agent exceeds 3.0wt%, there are problems of reducing the optical properties of the resin and reducing the adhesive performance. In detail, when the content of the antistatic agent in the photocurable resin exceeds 3.0wt%, the haze of the resin may increase, and the adhesive force between the light conversion part and the adhesive layer may decrease.

[0122] For example, when the content of the antistatic agent is greater than 3.0wt%, the haze may increase rapidly to 60% to 70%. In addition, when the content of the antistatic agent is greater than 3.0wt%, the lateral transmittance may be less than 30%. In detail, when the content of the antistatic agent is greater than 3.0wt%, the lateral transmittance may be 17% to 26%.

[0123] When the content of the antistatic agent is less than 2.0 wt %, the driving speed of the light path controlling member and the display device including the light path controlling member may be reduced.

[0124] The antistatic agent may contain a surfactant.

[0125] The antistatic agent may include at least one of conductive carbon, conductive inorganic materials such as metal particles, conductive polymers, and surfactants. For example, an embodiment may include a surfactant as an antistatic agent. Therefore, an embodiment may increase the driving speed by using a small amount of additives. In addition, the surfactant may have a low cost advantage. Conductive inorganic materials have the following disadvantages: the mixing process is difficult, particles may be generated, and the price is high. In addition, conductive polymers have problems such as color realization.

[0126] The surfactant may include at least one of a nonionic surfactant, a cationic surfactant, an anionic surfactant and an amphoteric surfactant. The nonionic surfactant may include an amine surfactant or a glyceryl surfactant. The cationic surfactant may include a quaternary ammonium salt. The anionic surfactant may include a sulfonate and a phosphate. The amphoteric surfactant may include betaine.

[0127] Here, the additive may further include a non-reactive release additive in the form of a siloxane product. For example, the non-reactive release additive may be a Si-containing material, such as PDMS.

[0128] The non-reactive release additive may include a material having a functional group bonded to polydimethylsiloxane. The non-reactive release additive may include a material having one or more functional groups bonded to polydimethylsiloxane. The non-reactive release additive may include a material having two or more functional groups that are the same or different from each other bonded to a polydimethylsiloxane material.

[0129] The non-reactive release additive can be a functional fluid in which a functional group is bonded to polydimethylsiloxane. Specifically, the functional group bonded to the main chain of polydimethylsiloxane can include various materials, such as alkyl, aryl, allyl, alkenyl, amide, amino, fluoroalkyl, halide group, epoxy, carboxyl, hydroxyl, alkoxy, methyl hydrogen, etc. In addition, Si-containing copolymers can include siloxane-polyurethane copolymers, siloxane-polyhexyl ester copolymers, siloxane-polyester copolymers, siloxane-polyimide copolymers, acryloxymethylsiloxane, p-styrylsiloxane, copolymers of silicon and aldehyde, polysilformal, etc.

[0130] In Example 2, the additive may include 0.3 wt % or less of the non-reactive release additive.

[0131] The photocurable resin of the embodiment may include a non-reactive release additive having a content of 0.3wt% or less. For example, the photocurable resin of the embodiment may include 0.1wt% to 0.2wt% of the non-reactive release additive. In detail, in the embodiment, the photocurable resin may include 0.1wt% to 0.2wt% of the non-reactive release additive, thereby exhibiting a haze value of 9% or less. In detail, in the embodiment, the photocurable resin may include 0.1wt% to 0.2wt% of the non-reactive release additive, thereby exhibiting a haze value of 5% or less. In detail, in the embodiment, the photocurable resin may include 0.1wt% to 0.2wt% of the non-reactive release additive, thereby exhibiting a haze value of 3% or less. In addition, in the embodiment, the photocurable resin may include 0.1wt% to 0.2wt% of the non-reactive release additive, so that the light path control member and the display device including the light path control member can exhibit a side transmittance of more than 30%. In detail, in an embodiment, the photocurable resin may include 0.1 wt % to 0.2 wt % of a non-reactive release additive, so that the light path control member and the display device including the light path control member may exhibit a lateral transmittance of 33% to 37%.

[0132] When the non-reactive release additive is included in the photocurable resin in an amount of less than 0.1 wt %, release properties may be deteriorated, and productivity or processing efficiency may be deteriorated when forming a resin layer by imprinting.

[0133] When the photocurable resin contains a non-reactive release additive in an amount greater than 0.3 wt %, the haze may increase rapidly. For example, when the photocurable resin contains a non-reactive release additive in an amount greater than 0.3 wt %, the haze may be 40% to 50%.

[0134] In Example 3, the photocurable resin forming the light conversion part may contain 2.4wt% to 2.8wt% of an antistatic agent and a non-reactive release additive as additives. For example, in the embodiment, the photocurable resin may contain 0.05wt% to 0.2wt% of a non-reactive release additive and 2.4wt% to 2.7wt% of an antistatic agent as an additive. In Example 2, since the two additives are added at an optimal content, all properties of release, adhesion, driving speed and transmittance can be improved. In Example 3, the value of the lateral transmittance can be increased compared to Example 1 or Example 2 in which any one of the release additive and the antistatic agent is added.

[0135] In an embodiment, the photocurable resin may include an antistatic agent and a non-reactive release additive as additives in an amount of 2.4wt% to 2.8wt%, so that the haze may be 9% or less. For example, in an embodiment, the photocurable resin may include an antistatic agent and a non-reactive release additive as additives in an amount of 2.4wt% to 2.8wt%, so that the haze may be 5% or less. For example, in an embodiment, the photocurable resin may include an antistatic agent and a non-reactive release additive as additives in an amount of 2.4wt% to 2.8wt%, so that the haze may be 3% or less.

[0136] In an embodiment, the photocurable resin may include 2.4 wt % to 2.8 wt % of an antistatic agent and a non-reactive release additive as additives, so that the side transmittance of the light path control member and the display device including the light path control member may be 30% or more.

[0137] For example, in an embodiment, the photocurable resin may contain 2.4wt% to 2.8wt% of an antistatic agent and a non-reactive release additive as additives, so that the side transmittance of the light path control member and the display device including the light path control member can be 35% or more. For example, in an embodiment, the photocurable resin may contain 2.4wt% to 2.8wt% of an antistatic agent and a non-reactive release additive as additives, so that the side transmittance of the light path control member and the display device including the light path control member can be 37% to 41%.

[0138] Meanwhile, when the additive is not included, there may be a problem that the lateral transmittance of a display device including the photocurable resin may be less than 5%.

[0139] [Table 1]

[0140]

[0141] In an embodiment, by measuring XPS from the upper surface 310T of the partition wall portion and the lower surface 420B of the adhesive layer in the depth direction of the partition wall portion, the content of the additive according to the position of the partition wall portion can be determined. The partition wall portion 310 can be divided into a first region as a surface portion of the resin, a second region as a middle portion, and a third region as a base layer portion according to its depth. In detail, the partition wall portion may include a first region P1 from the upper surface 310T of the partition wall portion in the depth direction to 30 μm, a second region P2 from 30 μm to 60 μm in the depth direction from the upper surface 310T of the partition wall portion, and a third region P3 from 60 μm to 95 μm in the depth direction from the upper surface of the partition wall portion.

[0142] In the embodiment, the Si content in the first region can be reduced. Therefore, film detachment of the adhesive layer on the surface of the resin layer can be prevented.

[0143] The details of the light conversion unit 300 will be described in detail below.

[0144] refer to Figures 5 to 9 , the light conversion portion 300 may include a partition wall portion 310 and a receiving portion 320 .

[0145] The partition wall portion 310 may be defined as a partition wall portion that divides the receiving portion. That is, the partition wall portion 310 may transmit light as a barrier region that divides a plurality of receiving portions. In addition, the receiving portion 320 may be defined as a variable region in which the receiving portion 320 switches between a light shielding portion and a light transmitting portion according to the application of a voltage.

[0146] The partition wall portions 310 and the receiving portions 320 may be arranged alternately with each other. The partition wall portions 310 and the receiving portions 320 may be arranged to have different widths. For example, the width of the partition wall portions 310 may be greater than the width of the receiving portions 320.

[0147] The partition wall portions 310 and the receiving portions 320 may be arranged alternately with each other. In detail, the partition wall portions 310 and the receiving portions 320 may be arranged alternately with each other. That is, each partition wall portion 310 may be arranged between the receiving portions 320 adjacent to each other, and each receiving portion 320 may be arranged between the adjacent partition wall portions 310.

[0148] The partition wall portion 310 may include a transparent material. The partition wall portion 310 may include a material capable of transmitting light.

[0149] The partition wall part 310 may transmit light incident on any one of the first substrate 110 and the second substrate 120 toward the other substrate.

[0150] For example, refer to Figures 6 to 9, light may be emitted from the first substrate 110 by the light source disposed under the first substrate 110, and the light may be incident toward the second substrate 120. In this case, the partition wall portion 310 may transmit the light, and the transmitted light may move toward the second substrate 120.

[0151] The receiving part 320 may include a dispersion liquid 320a and light conversion particles 320b. Specifically, the receiving part 320 may be filled by injecting the dispersion liquid 320a. A plurality of light conversion particles 320b may be dispersed in the dispersion liquid 320a.

[0152] The dispersion 320a may be a material for dispersing the light conversion particles 320b. The dispersion 320a may include a transparent material. The dispersion 320a may include a non-polar solvent. In addition, the dispersion 320a may include a material capable of transmitting light. For example, the dispersion 320a may include at least one of a halogen-based oil, a paraffin-based oil, and isopropyl alcohol.

[0153] The light conversion particles 320b may be disposed to be dispersed in the dispersion liquid 320a. In detail, a plurality of light conversion particles 320b may be disposed to be spaced apart from each other in the dispersion liquid 320a.

[0154] The dispersion liquid 320A may further include additives. The additives included in the dispersion liquid 320A will be described in detail below.

[0155] The light conversion particles 320b may include a material capable of absorbing light. That is, the light conversion particles 320b may be light absorbing particles. The light conversion particles 320b may have a color. For example, the light conversion particles 320b may have a color based on black. For example, the light conversion particles 320b may include carbon black.

[0156] The photoconversion particles 320b may have polarity by charging their surfaces. For example, the surfaces of the photoconversion particles 320b may be negatively (-) charged. Therefore, the photoconversion particles 320b may move toward the first electrode 210 or the second electrode 220 according to the application of voltage.

[0157] The light transmittance of the receiving portion 320 may be changed by the light conversion particles 320b. In detail, the receiving portion 320 may be switched between a light shielding portion and a light transmitting portion by changing the light transmittance due to the movement of the light conversion particles 320b. That is, the receiving portion 320 may change the transmittance of light passing through the receiving portion 320 by dispersing and aggregating the light conversion particles 320b disposed in the dispersion 320a.

[0158] For example, the light path controlling member according to the embodiment may be transformed 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 .

[0159] In detail, in the light path control member according to the embodiment, in the first mode, the receiving portion 320 can become a light shielding portion, and light at a specific angle can be blocked by the receiving portion 320. That is, the user's viewing angle from the outside is narrowed, so that the light path control member can be driven in the privacy mode.

[0160] In addition, in the light path control member according to the embodiment, in the second mode, the housing portion 320 becomes a light-transmitting portion, and in the light path control member according to the embodiment, light can be transmitted through both the partition wall portion 310 and the housing portion 320. That is, the viewing angle of the user from the outside is widened, so that the light path control member can be driven in the public mode.

[0161] The switching from the first mode to the second mode, that is, the conversion of the receiving portion 320 from the light shielding portion to the light transmitting portion can be achieved by the movement of the light conversion particles 320b of the receiving portion 320. That is, the light conversion particles 320b may have charges on their surfaces and may move toward the first electrode or the second electrode according to the application of a voltage according to the characteristics of the charges. That is, the light conversion particles 320b may be electrophoretic particles.

[0162] In detail, the receiving part 320 may be electrically connected to the first electrode 210 and the second electrode 220 .

[0163] In this case, when voltage is not applied to the light path control member from the outside, the light conversion particles 320b of the receiving portion 320 are uniformly dispersed in the dispersion 320a, and the receiving portion 320 can block light by the light conversion particles. Therefore, in the first mode, the receiving portion 320 can be driven as a light shielding portion.

[0164] Alternatively, when a voltage is applied to the light path control member from the outside, the light conversion particle 320b can move. For example, the light conversion particle 320b can move toward one end or the other end of the receiving portion 320 by the voltage transmitted via the first electrode 210 and the second electrode 220. That is, the light conversion particle 320b can move from the receiving portion 320 toward the first electrode 210 or the second electrode 220.

[0165] In detail, when 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 negatively charged photoconversion particles 320b can move toward the positive poles of the first electrode 210 and the second electrode 220 using the dispersion 320a as a medium.

[0166] That is, when a voltage is applied to the first electrode 210 and / or the second electrode 220, Figure 8As shown, the light conversion particles 320b may move in the dispersion 320a toward the first electrode 210. That is, the light conversion particles 320b may move in one direction, and the receiving portion 320 may be driven as a light-transmitting portion.

[0167] Alternatively, when no voltage is applied to the first electrode 210 and / or the second electrode 220, as shown in FIG. Fig. 9 As shown, the light conversion particles 320 b may be uniformly dispersed in the dispersion 320 a to drive the receiving portion 320 to be a light shielding portion.

[0168] Therefore, the light path control member according to the embodiment can be driven in two modes according to the user's surrounding environment. That is, when the user requires light transmission only at a specific viewing angle, the receiving portion is driven as a light shielding portion, or in an environment where the user requires high brightness, a voltage can be applied to drive the receiving portion as a light transmitting portion.

[0169] Therefore, since the light path control member according to the embodiment can be implemented in two modes according to the user's requirements, the light path control member can be applied regardless of the user's environment.

[0170] Meanwhile, the housing portion may be provided in various shapes in consideration of driving characteristics and the like.

[0171] refer to Figure 6 and Figure 7 In a light path control member according to another embodiment, Figure 5 Differently, both ends of the receiving portion 320 may be disposed to be in contact with the buffer layer 410 and the adhesive layer 420 .

[0172] For example, a lower portion of the receiving portion 320 may be disposed in contact with the buffer layer 410 , and an upper portion of the receiving portion 320 may be disposed in contact with the adhesive layer 420 .

[0173] Therefore, the distance between the receiving portion 320 and the first electrode 210 may be reduced, so that the voltage applied from the first electrode 210 may be smoothly transmitted to the receiving portion 320 .

[0174] Therefore, the moving speed of the light conversion particles 320 b in the receiving portion 320 can be increased, and thus the driving characteristics of the light path control member can be improved.

[0175] In addition, reference Figure 8 and Fig. 9 ,and Figure 6 and Figure 7 Differently, in the light path control member according to the embodiment, the receiving portion 320 may be provided to have a constant inclination angle θ.

[0176] For details, refer to Figure 8 and Fig. 9The receiving portion 320 may be disposed to have an inclination angle θ of greater than 0° to less than 90° relative to the first substrate 110. In detail, the receiving portion 320 may extend upward while having an inclination angle θ of greater than 0° to less than 90° relative to one surface of the first substrate 110.

[0177] Therefore, when the light path member is used together with the display panel, moire caused by an overlapping phenomenon between the pattern of the display panel and the receiving portion 320 of the light path member may be reduced, thereby improving user visibility.

[0178] In the following, reference Figures 10 to 13 Improving the lateral transmittance of a device by including a non-reactive additive in an example EPD ink is described.

[0179] The light conversion material 320 ′ may include light conversion particles and a dispersion liquid.

[0180] The light converting particles may include carbon black.

[0181] The dispersion may include additives and surfactants. That is, embodiments may improve the driving performance of a device by including a non-reactive additive in the EPD ink.

[0182] Fig.10 is a view showing an example of the principle that an additive is attached to the surface of a partition wall portion in a dispersion liquid.

[0183] The non-reactive additive may include -Si- bonds. For example, the non-reactive additive may include a PDMS backbone, thereby comprising repeating bonds of -Si-O-Si-.

[0184] When a small amount of water molecules are present in the solvent, the silane group becomes Si-OH, thereby making a hydrophobic surface. For example, the Si-X bond of a non-reactive additive contained in the dispersion can react with water molecules to become a Si-OH bond.

[0185] Polymer aggregates and other microstructures can be located around the Si-OH groups.

[0186] At this time, X Figure 6 , but the embodiment is not limited thereto and may include various functional groups. For example, in the Si-X bond included in the non-reactive additive, X may include various functional groups including halogen groups such as F and CH3, alkyl groups, alkoxy groups, hydroxyl groups, alkenyl groups, and aryl groups.

[0187] Meanwhile, the non-reactive additive may include a Si-OH bond. For example, when the functional group is bonded to an alkoxy group or a hydroxyl group in PDMS, the non-reactive additive may include a Si-OH bond.

[0188] For example, a monolayer silane surface can be formed on the partition wall portion by crosslinking and surface adhesion between silane groups. That is, micelles can be formed as a monolayer. When a small amount of water molecules are present in the solvent, the silane group is hydrolyzed into Si-OH and forms a hydrophobic surface as a whole.

[0189] The thickness of the micelle can be 1 nm to 500 nm. For example, the thickness of the micelle can be 1 nm to 300 nm. For example, the thickness of the micelle can be 1 nm to 500 nm. Unlike the core-shell structure, the thickness of the micelle can be less than 1 μm.

[0190] For example, the non-reactive additive may include an -O-Si- bond, and an oxygen element in the -O-Si- bond may form a chemical bond with a component of the partition wall portion. For example, oxygen contained in the non-reactive additive may form a covalent bond with an element on the partition wall portion.

[0191] Fig.11 Schematic diagram of the dispersion of carbon black and the formation of micelles.

[0192] When the amount of the surfactant in the photoconversion material 320' is large, more surfactant can be attached around the carbon black to form micelles. Therefore, there is a problem that the charge of the carbon black is reduced and the moving speed is reduced.

[0193] Therefore, in the embodiment, by mixing the EPD ink and the non-reactive additive, the driving performance of the device can be improved. Specifically, when the silane component of the non-reactive additive moves to the surface of the partition wall portion, the distribution in the solvent can be reduced while forming a surfactant with micelles in the EPD.

[0194] Therefore, the movement of the carbon black particles in the photoconversion material can be facilitated. That is, the carbon black particles in the photoconversion material are not restricted from moving by the surfactant, so that the side transmittance in the shared mode can be improved.

[0195] The dispersion may include micelles formed by the reaction of the surfactant and the silane component of the additive.

[0196] In an embodiment, various forms of micelles may be included. Here, first, second, and third may be used to distinguish different types of micelles.

[0197] The first micelle may surround carbon black in the dispersion. For example, the first micelle may be in the form of surrounding carbon black particles in the dispersion. In detail, the first micelle may surround one carbon black particle in the dispersion. Alternatively, the first micelle may surround two or more carbon black particles in the dispersion. The anionic material may be located on the surface of the first micelle.

[0198] Therefore, a plurality of carbon black particles may be contained in the dispersion, and each of the plurality of carbon black particles may be surrounded again by the first micelle. Therefore, a plurality of carbon black particles in the dispersion may be dispersed by the first micelle.

[0199] The second micelles may surround ions in the dispersion. For example, the second micelles may surround cationic materials present in the dispersion.

[0200] The first micelle can stabilize anions. On the other hand, the second micelle can stabilize cations. That is, ions with different polarities can be stabilized by different micelles in the dispersion.

[0201] The third micelle can be attached to the surface of the partition wall portion in the dispersion. In detail, the silane component of the non-reactive additive in the EPD ink can move to the surface of the partition wall portion. Therefore, like the silane surface coating, the -O-Si- component of the non-reactive additive can be bonded to the partition wall portion. The surfactant in the EPD ink can form micelles with the silane component of the non-reactive additive. Therefore, the stacking density of the carbon black particles in the sharing mode can be improved, and thus the lateral transmittance of the device can be improved.

[0202] Furthermore, since micelles are formed between surfactant molecules existing in excess in the EPD ink, and such micelles between surfactant molecules form micelles with silane, the distribution of the surfactant in the EPD ink may be reduced.

[0203] The non-reactive additive of the embodiment can form micelles with various types of surfactants. For example, the element part of -Si- of the non-reactive additive of the embodiment can form micelles with various types of surfactants. In detail, the surfactant can form micelles by itself, regardless of the type, component, length, molecular weight, functional group, etc. of the surfactant. The micelle of the surfactant itself can have a head and a tail. For example, when the head is located inside the micelle, the tail can be located outside the micelle. For example, when the tail is located inside the micelle, the head can be located outside the micelle.

[0204] For example, when the head of the surfactant is attached to the outer edge of -Si- of a non-reactive additive, it can form micelles. For example, when the head of the surfactant is attached to the outer edge of -Si-O- of a non-reactive additive, it can form micelles. For example, when the head of the surfactant is attached to the outer edge of -Si-CH3 of a non-reactive additive, it can form micelles.

[0205] Reference Fig.12 and 13 Describe the surfactant in detail.

[0206] Reference Fig.12 Describe in detail the structure and types of surfactants.

[0207] In an embodiment, the surfactant may refer to various types of surfactants. For example, the surfactant may be at least one of a nonionic surfactant, a cationic surfactant, an anionic surfactant, and an amphoteric (zwitterionic) surfactant. Here, the difference between the nonionic, cationic, anionic, and amphoteric properties of the surfactant can be distinguished by the polarity of the head.

[0208] A compound constituting a surfactant may include a hydrophilic portion and a hydrophobic portion. Here, the head of the surfactant may refer to the hydrophilic portion of the surfactant. Here, the tail of the surfactant may refer to the hydrophobic portion of the surfactant.

[0209] For example, the surfactant may be any one of Triton X-100, CTAB, AOT and phosphatidylcholine. Of course, the surfactant of the embodiment is not limited thereto and may be various materials.

[0210] Fig.13 It is a view showing the micelle form of the surfactant itself.

[0211] For example, in a nonionic surfactant, the tail can be located inside the micelle and the head can be located outside the micelle. In this case, the head can exhibit nonionic properties. For example, in an anionic surfactant, the head can be located inside the micelle and the tail can be located outside the micelle. In this case, the head can exhibit anionic properties.

[0212] In the embodiment, the carbon black particles in the EPD ink are not hindered by the surfactant to reduce the charge, so the moving speed can be fast. Therefore, the embodiment can increase the driving speed of the device.

[0213] With reference to Table 2, the evaluation results of the driving characteristics according to the content of the non-reactive additive in the EPD ink will be described.

[0214] Here, the standard of the content of the non-reactive additive refers to the content of the additive when compared with the case where the weight of the EPD ink excluding the additive is 100 wt %.

[0215] Types of non-reactive additives may include fluids (oils), gums, resins, and elastomers.

[0216] The fluid may be a linear polymer. For example, the fluid may be a Si-containing material such as polydimethylsiloxane (PDMS). Alternatively, the fluid may be a functional fluid. Here, the functional fluid may include a material in which a functional group is bonded to polydimethylsiloxane.

[0217] The non-reactive additive may include a material having one or more functional groups bonded to polydimethylsiloxane. The non-reactive additive may include a material having two or more functional groups that are the same as or different from each other bonded to polydimethylsiloxane.

[0218] The non-reactive additive can be a functional fluid in which a functional group is bonded to polydimethylsiloxane. Specifically, the functional group bonded to the main chain of polydimethylsiloxane can include the following various materials, such as alkyl, aryl, allyl, alkenyl, amide, amino, fluoroalkyl, halide group, epoxy, carboxyl, hydroxyl, alkoxy, methyl hydrogen, etc. In addition, Si-containing copolymers can include siloxane-polyurethane copolymers, siloxane-polyhexyl ester copolymers, siloxane-polyester copolymers, siloxane-polyimide copolymers, acryloxymethylsiloxane, p-styrylsiloxane, copolymers of silicon and aldehyde, polysilicon formal, etc.

[0219] The non-reactive additive having functional groups bonded to the polydimethylsiloxane may be an organically modified linear polydimethylsiloxane backbone.

[0220] Gum can be a linear polymer of ultra-high molecular weight.

[0221] The resin is a polymer having a three-dimensional siloxane structure and may refer to the presence of three reactive groups.

[0222] The elastomer may be in a state where the silane / siloxane is cross-linked to form a network.

[0223] [Table 2]

[0224]

[0225] Comparative Example 2 is a photocurable resin containing no non-reactive additives. Here, the photocurable resin is a polyurethane substrate.

[0226] Example 4 is PDMS bonded with alkyl functional groups.

[0227] Example 5 is PDMS bonded with a fluoroalkyl group.

[0228] Example 6 is a siloxane-urethane copolymer.

[0229] In Examples 4-6, when the content of the non-reactive additive was 0.1 wt % to 20 wt % based on 100 wt % of the dispersion liquid, it was confirmed that the lateral transmittance of the device measured in the sharing mode was 30% or more.

[0230] For example, in the embodiment, the content of the non-reactive additive is 0.1 wt % to 10 wt % based on 100 wt % of the dispersion liquid, so that it can be confirmed that the lateral transmittance of the device measured in the sharing mode is 30% or more.

[0231] For example, in the embodiment, the content of the non-reactive additive is 0.1 wt % to 5 wt % based on 100 wt % of the dispersion liquid, so that it can be confirmed that the lateral transmittance of the device measured in the sharing mode is 30% or more.

[0232] Here, the side transmittance is measured in the sharing mode, and the side transmittance may refer to the brightness value measured when the device is located at a 45-degree position. In other words, the side transmittance is the brightness value of the device located at a 45-degree position measured in the measuring device.

[0233] That is, in the present invention, a non-reactive additive may be included in the EPD ink in order to increase the driving speed of the device. Therefore, the dispersibility between the carbon black particles in the EPD ink may be improved. In addition, since the carbon black in the EPD ink is easy to move, the driving speed may also be increased. In addition, the lateral transmittance of the device in the sharing mode may be improved.

[0234] On the other hand, the EPD ink according to the embodiment may include only the surfactant.

[0235] In detail, the EPD ink may include a surfactant that reacts with a non-reactive additive.

[0236] In addition, a non-reactive additive that reacts with a surfactant may be disposed on the partition wall. Specifically, a non-reactive additive that reacts with a surfactant to form micelles may be disposed on the surface of the partition wall portion. More specifically, a non-reactive additive that reacts with a surfactant to form micelles may be formed on the surface of the partition wall portion.

[0237] Therefore, the embodiment can improve the driving performance of the device by disposing the non-reactive additive on the surface of the partition wall portion in contact with the EPD ink. Specifically, the non-reactive additive on the surface of the partition wall portion can reduce the distribution in the solvent while forming micelles with the surfactant in the EPD ink.

[0238] That is, the surfactant in the EPD ink can form micelles with the silane component of the non-reactive additive. Therefore, the packing density of carbon black particles in the sharing mode can be improved, thereby improving the lateral transmittance of the device.

[0239] In the following, reference will be made to Figures 14 to 20 A method for manufacturing a light path control member according to an embodiment will be described.

[0240] refer to Fig.14 , prepare the first substrate 110 and the electrode material forming the first electrode. Then, the first electrode is formed by coating or depositing the electrode material on one surface of the first substrate. Specifically, the electrode material can be formed on the entire surface of the first substrate 110. Therefore, the first electrode 210 formed as a surface electrode can be formed on the first substrate 110.

[0241] Then, refer to Fig.15 The resin layer 350 may be formed by coating a resin material on the first electrode 210. Specifically, the resin layer 350 may be formed by coating a polyurethane resin or an acrylic resin on the first electrode 210.

[0242] In this case, the buffer layer 410 may be additionally disposed on the first electrode 210 before the resin layer 350 is disposed. In detail, by disposing the resin layer 350 on the buffer layer 410 after disposing the buffer layer 410 having good adhesion with the resin layer 350 on the first electrode 210, the adhesion of the resin layer 350 can be improved.

[0243] For example, the buffer layer 410 may include a material including an oleophilic group such as —CH—, an alkyl group, etc. having good adhesion to an electrode and a hydrophilic group such as —NH, —OH, —COOH, etc. having good adhesion to the resin layer 410 .

[0244] The resin layer 350 may be disposed on a partial region of the first substrate 110. That is, the resin layer 350 may be disposed in a region smaller than the region of the first substrate 110. Therefore, a region where the resin layer 350 is not disposed and the first electrode 210 is exposed may be formed on the first substrate 110. In addition, when the buffer layer 410 is disposed on the first electrode 210, a region where the buffer layer 410 is exposed may be formed.

[0245] In detail, the dimension of the third length extending in the first direction of the resin layer 350 may be smaller than the dimension of the first length extending in the first direction of the first substrate 110 , and the dimension of the third width extending in the second direction may be smaller than or equal to the dimension of the first width extending in the second direction of the first substrate 110 .

[0246] That is, the length of the resin layer 350 may be smaller than the length of the first substrate 110 , and the width of the resin layer 350 may be equal to or smaller than the width of the first substrate 110 .

[0247] Then, refer to Fig.16The resin layer 350 may be patterned to form a plurality of partition walls 310 and a plurality of receiving portions 320 in the resin layer 350. In detail, engraving portions may be formed in the resin layer 350 to form receiving portions 320 in an engraved shape and partition walls 310 in an embossed shape between the engraved portions.

[0248] Accordingly, the light conversion part 300 including the partition wall part 310 and the receiving part 320 may be formed on the first substrate 110 .

[0249] In addition, the buffer layer 410 exposed on the first electrode 210 may be removed to expose the first electrode 210 in a region where the first substrate 110 protrudes.

[0250] Then, refer to Fig.17 , prepare the second substrate 120 and the electrode material for forming the second electrode. Then, the second electrode can be formed by coating or depositing the electrode material on one surface of the second substrate. In detail, 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.

[0251] The size of the second substrate 120 may be smaller than that of the first substrate 110. In addition, the size of the second substrate 120 may be smaller than that of the resin layer 350.

[0252] In detail, the second length extending in the first direction of the second substrate 120 may be larger than the third length extending in the first direction of the resin layer 350 , and the second width extending in the second direction of the second substrate 120 may be smaller than the third width extending in the second direction of the resin layer 350 .

[0253] Then, refer to Fig.18 , the adhesive layer 420 may be formed by coating an adhesive material on the second electrode 220. In detail, a light-transmitting adhesive layer capable of transmitting light may be formed on the second electrode 220. For example, the adhesive layer 420 may include an optically transparent adhesive layer OCA.

[0254] The adhesive layer 420 may be disposed on a partial region of the light conversion part 300. That is, the adhesive layer 420 may be disposed in a region smaller than the region of the light conversion part 300. Accordingly, a region where the adhesive layer 410 is not disposed and the light conversion part 300 is exposed may be formed on the light conversion part 300.

[0255] In detail, the dimension of the fourth length extending in the first direction of the adhesive layer 420 can be larger than the dimension of the third length extending in the first direction of the light conversion unit 300, and the dimension of the fourth width extending in the second direction of the adhesive layer 420 can be smaller than the dimension of the third width extending in the second direction of the light conversion unit 300.

[0256] Then, refer to Fig.19 , the first substrate 110 and the second substrate 120 may be bonded. In detail, the second substrate 120 may be disposed on the light conversion part 300 , and the second substrate 120 and the light conversion part 300 may be bonded by an adhesive layer 420 disposed under the second substrate 120 .

[0257] Accordingly, the first substrate 110 , the light conversion part 300 , and the second substrate 120 may be sequentially stacked in a thickness direction of the first substrate 110 , the light conversion part 300 , and the second substrate 120 .

[0258] In this case, since the second substrate 120 is provided in a size smaller than that of the resin layer 350 , a plurality of partition wall portions 310 and receiving portions 320 may be exposed in a region where the second substrate 120 is not provided on the light conversion portion 300 .

[0259] In detail, since the dimension of the second width extending in the second direction of the second substrate 120 is smaller than the dimension of the third width extending in the second direction of the resin layer 350, the plurality of partition wall portions 310 and the accommodating portions 320 can be exposed in the end region of at least one of the one end and the other end facing each other in the width direction of the resin layer 350.

[0260] Subsequently, the light conversion material 380 may be injected between the partition wall portions 310, ie, the housing portions 320. Specifically, the light conversion material in which light absorbing particles such as carbon black are dispersed in an electrolyte solvent including a paraffin solvent or the like may be injected between the partition wall portions, ie, the housing portions 320.

[0261] For example, after a dam extending in the longitudinal direction of the light conversion unit 300 is disposed on the receiving portion and the partition wall portion of the light conversion unit 300 where the second substrate 120 is not disposed, an electrolyte solvent can be injected into the receiving portion 320 between the dam and the side surface of the light conversion unit 300 by a capillary injection method.

[0262] Subsequently, a light path control member may be manufactured by cutting the light conversion unit 300. In detail, the light conversion unit 300 may be cut in the longitudinal direction of the light conversion unit 300. That is, the light conversion unit 300, the buffer layer 410 below the light conversion unit 300, the first electrode 210, and the first substrate 110 may be cut along the longitudinal direction of the light conversion unit 300. Fig.19The dotted line cutting shown in FIG. A plurality of light path control components A and B can be formed by the cutting process. Fig. 20 is a view showing one of a plurality of light path control members.

[0263] In detail, the light conversion part 300 may be cut so that the side surfaces of the first substrate 110 , the second substrate 120 , and the light conversion part 300 in the width direction may be disposed on the same plane.

[0264] Accordingly, both ends of the second substrate 120 , the second electrode 220 , or the adhesive layer 420 in the second direction and both ends of the light conversion part 300 in the second direction may be disposed on the same plane.

[0265] That is, both ends of the adhesive layer 420 in the second direction and both ends of the light conversion part 300 in the second direction may be connected to each other.

[0266] Alternatively, both ends of the second substrate 120 , the second electrode 220 , or the adhesive layer 420 in the second direction may be disposed outside the both ends of the light conversion unit 300 in the second direction according to an error during a process.

[0267] Subsequently, the buffer layer 410 disposed on the first substrate 110 and / or the adhesive layer 420 disposed under the second substrate 120 may be partially removed to form a connection portion exposing the electrode. In detail, when the buffer layer 410 is disposed on the first electrode on which the light conversion unit 300 is not disposed on the upper surface of the first substrate 110, the first connection portion 211 may 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 on which the light conversion unit 300 is not disposed from the beginning. In addition, when the adhesive layer 420 is disposed on the second electrode on which the light conversion unit 300 is not disposed on the lower surface of the second substrate 120, the second connection portion 221 may 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 on which the light conversion unit 300 is not disposed during the bonding process.

[0268] A printed circuit board or a flexible printed circuit board may be connected to the connection portion through an anisotropic conductive film (ACF) or the like, and the printed circuit board may be connected to an external power source to apply a voltage to the light path control member.

[0269] Below, reference Figures 21 to 25 , a display device to which the light path control member according to the embodiment is applied will be described.

[0270] refer to Fig.21 and 22 , the light path controlling member 1000 according to the embodiment may be disposed above or below the display panel 2000 .

[0271] The display panel 2000 and the light path control member 1000 may be arranged to be bonded to each other. For example, the display panel 2000 and the light path control member 1000 may be bonded to each other through an adhesive layer 1500. The adhesive layer 1500 may be transparent. For example, the adhesive layer 1500 may include an adhesive or an adhesive layer including an optically transparent adhesive material.

[0272] The adhesive layer 1500 may include a release film. In detail, when the light path control member and the display panel are bonded, the light path control member and the display panel may be bonded after removing the release film.

[0273] At the same time, reference Fig.21 and 22 , one end or one end and the other end of the light path control member may protrude, and the light conversion unit may not be provided at the protruding portion. The protruding portion 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 may be connected through the electrode connection portion.

[0274] The display panel 2000 may include a 1st 'substrate 2100 and a 2nd 'substrate 2200. When the display panel 2000 is a liquid crystal display panel, the light path control member may be formed below 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 member may be disposed below the liquid crystal panel. The display panel 2000 may be formed in a structure in which the 1st 'substrate 2100 including a thin film transistor (TFT) and a pixel electrode and the 2nd 'substrate 2200 including a color filter layer are combined with each other, and a liquid crystal layer is interposed therebetween.

[0275] In addition, the display panel 2000 may be a liquid crystal display panel of a color filter on transistor (COT) structure, in which a thin film transistor, a color filter and a black electrolyte are formed at the first 'substrate 2100, the second 'substrate 2200 is bonded to the first 'substrate 2100 and a liquid crystal layer is interposed therebetween. That is, a thin film transistor may be formed on the first 'substrate 2100, a protective film may be formed on the thin film transistor, and a color filter layer may be formed on the protective film. In addition, a pixel electrode in contact with the thin film transistor may be formed on the first 'substrate 2100. In this case, in order to increase the aperture ratio and simplify the mask process, the black electrolyte may be omitted, and the common electrode may function as the black electrolyte.

[0276] In addition, when the display panel 2000 is a liquid crystal display panel, the display device may further include a backlight unit 3000 that provides light from a rear surface of the display panel 2000 .

[0277] That is, Fig.21 As shown, the light path control member may be disposed below the liquid crystal panel and on the backlight unit 3000 , and the light path control member may be disposed between the backlight unit 3000 and the display panel 2000 .

[0278] Or, if Fig. 22 As shown, when the display panel 2000 is an organic light emitting diode panel, the light path control member can be formed on the organic light emitting diode panel. That is, when the surface of the organic light emitting diode panel viewed by the user is defined as the upper part of the organic light emitting diode panel, the light path control member can be provided on the organic light emitting diode panel. The display panel 2000 may include a self-luminous element that does not require a separate light source. In the display panel 2000, a thin film transistor may be formed on the 1st 'substrate 2100, and an organic light emitting element in contact with the thin film transistor may 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 2nd 'substrate 2200 configured to function as an encapsulation substrate for encapsulation may also be included on the organic light emitting element.

[0279] That is, light emitted from the display panel 2000 or the backlight unit 3000 may move from the second substrate 120 of the light path control member toward the first substrate 110 .

[0280] In addition, although not shown in the figure, a polarizing plate may be provided between the light path control member 1000 and the display panel 2000. The polarizing plate may be a linear polarizing plate or a polarizing plate that prevents external light from being reflected. For example, when the display panel 2000 is a liquid crystal display panel, the polarizing plate may be a linear polarizing plate. In addition, when the display panel 2000 is an organic light emitting diode panel, the polarizing plate may be a polarizing plate that prevents external light from being reflected.

[0281] In addition, an additional functional layer 1300, such as an anti-reflection layer, an anti-glare layer, etc., may be further provided on the light path control member 1000. In detail, the functional layer 1300 may be attached to one surface of the first substrate 110 of the light path control member. Although not shown in the figure, the functional layer 1300 may be attached to the first substrate 110 of the light path control member through an adhesive layer. In addition, a release film for protecting the functional layer may also be provided on the functional layer 1300.

[0282] In addition, a touch panel may be provided between the display panel and the light path control member.

[0283] Although the figure shows that the light path control member is set at the upper part of the display panel, the present embodiment is not limited to this, and the light path control member can be set at various positions such as the position of adjustable light, that is, the lower part of the display panel, or between the second substrate and the first substrate of the display panel, etc.

[0284] In addition, in the drawings, the light conversion part of the light path control member according to the embodiment is in a direction parallel to or perpendicular to the outer surface of the second substrate, but the light conversion part is formed to be inclined at a predetermined angle from the outer surface of the second substrate. Thus, the moiré phenomenon occurring between the display panel and the light path control member can be reduced.

[0285] refer to Figure 23 to Figure 25 , the light path controlling member according to the embodiment can be applied to various display devices.

[0286] refer to Figures 23 to 25 , the light path control member according to the embodiment can be applied to a display device that displays a display picture.

[0287] For example, Fig.23 As shown, when power is applied to the light path control member, the receiving portion functions as a light-transmitting portion, so that the display device can be driven in a public mode, and as shown in FIG. Fig.24 As shown, when power is not applied to the light path control member, the housing portion functions as a light shielding portion, so that the display device can be driven in a light shielding mode.

[0288] Therefore, the user can easily drive the display device in the privacy mode or the normal mode according to the application of power.

[0289] The light emitted from the backlight unit or the self-luminous element may move from the first substrate toward the second substrate. Alternatively, the light emitted from the backlight unit or the self-luminous element may also move from the second substrate toward the first substrate.

[0290] In addition, reference Fig.25 , a display device to which the light path control member according to the embodiment is applied can also be applied to the interior of a vehicle.

[0291] For example, a display device including the light path control member according to the embodiment may display video confirmation information of the vehicle and a moving path of the vehicle. The display device may be disposed between a driver seat and a passenger seat of the vehicle.

[0292] Furthermore, the light path control member according to the embodiment may be applied to a dashboard that displays the speed, engine and warning signals, etc. of a vehicle.

[0293] In addition, the light path controlling member according to the embodiment may be applied to a windshield (FG) or left and right window glasses of a vehicle.

[0294] The features, structures, effects, etc. described in the above embodiments are included in at least one embodiment of the present invention, but are not limited to only one embodiment. In addition, those skilled in the art can combine or modify the features, structures, and effects shown in each embodiment for other embodiments. Therefore, it should be understood that such combinations and modifications are included within the scope of the present invention.

[0295] In addition, the above mainly describes the embodiments, but these embodiments are only examples and do not limit the present invention. It can be understood by those skilled in the art that various changes and applications not proposed above can be made without departing from the basic features of the embodiments. For example, each component specifically represented in the embodiment can be changed. In addition, it should be understood that the differences associated with such changes and such applications are included in the scope of the present invention defined by the appended claims.

Claims

1. A light path control component, comprising: a first substrate; a first electrode, the first electrode being disposed on the first substrate; a light conversion unit, wherein the light conversion unit is disposed on the first electrode; a second substrate, the second substrate being disposed on the first substrate; a second electrode, the second electrode being disposed below the second substrate; as well as an adhesive layer provided between the light conversion unit and the second electrode, The light conversion part includes partition walls and receiving parts which are alternately arranged. The receiving portion has a light transmittance that changes according to the application of voltage, The upper surface of the partition wall portion is in contact with the adhesive layer, The partition wall portion of the light conversion portion is formed of a photocurable resin, The photocurable resin comprises oligomers, monomers, photopolymerization initiators and additives. The additives include an antistatic agent and a non-reactive release additive in the form of a silicone material, and When the weight of the photocurable resin is 100 wt %, the content of the additive is 2.0 wt % to 3.0 wt %.

2. The optical path control member according to claim 1, wherein: The antistatic agent includes at least one of a nonionic surfactant, a cationic surfactant, an anionic surfactant and an amphoteric surfactant.

3. The optical path control member according to claim 2, wherein: The nonionic surfactants include amine-based surfactants and glycerol-based surfactants. The cationic surfactant includes a quaternary ammonium salt, The anionic surfactants include sulfonates and phosphates, The amphoteric surfactant includes betaine.

4. The light path control member according to claim 1, wherein: The non-reactive release additive is a silicon-containing material.

5. The light path control member according to claim 1, wherein: The content of the non-reactive release additive is less than 0.3 wt %.

6. The light path control member according to claim 1, wherein: The non-reactive release additive is present in an amount of 0.1 wt % to 0.3 wt %.

7. The light path control member according to claim 1, wherein: The non-reactive release additive includes a material having a functional group bonded to polydimethylsiloxane.

8. The light path control member according to claim 7, wherein: The functional group includes an alkyl group, an aryl group, an allyl group, an alkenyl group, an amide group, an amino group, a fluoroalkyl group, a halide group, an epoxy group, a carboxyl group, a hydroxyl group or an alkoxy group, and a methyl hydrogen group.

9. The light path control member according to claim 1, wherein: The light conversion unit has a haze of 9% or less.

10. The light path control member according to claim 1, wherein: The side transmittance of the light conversion unit is greater than 30%.

11. The light path control member according to claim 1, wherein: The photocurable resin comprises polyurethane acrylate, acrylate monomer, isobornyl acrylate, additives, photoinitiator and acryloylmorpholine.

12. The light path control member according to claim 1, wherein: The antistatic agent and the non-reactive release additive are present in an amount of 2.4 wt % to 2.8 wt %.

13. The light path control member according to claim 1, wherein: The receiving portion contains light conversion particles and a dispersion liquid. The light conversion particles include carbon black, and The dispersion includes a surfactant that reacts with the additive.

14. The light path control member according to claim 13, wherein: The surfactant includes at least one of a nonionic surfactant, a cationic surfactant, an anionic surfactant and an amphoteric surfactant.

15. The light path control member according to claim 13, wherein: The photoconversion particles move in the direction of the first electrode or the second electrode by the applied voltage.

16. A display device, comprising: Display panel; as well as According to the light path control member according to claim 1, the light path control member is arranged on the display panel.

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