Electrophoretic particles and optical path control member comprising the same

Abstract

According to an embodiment, the electrophoretic particles include carbon black, and the electrophoretic particles include: a core portion; and a shell portion disposed around the outer surface of the core portion, wherein protrusions are formed on the surface of the core portion, the core portion has a chromaticity index of less than 2, the core portion has a light absorption rate of 90% to 99%, and the particle size of the electrophoretic particles is 50 nm to 800 nm.

Description

TECHNICAL FIELD

[0001] Embodiments relate to electrophoretic particles having improved dispersibility and driving speed, and an optical path control member including the same. BACKGROUND

[0002] The light shielding film shields transmission of light from a light source, is attached to a front surface of a display panel serving as a display device for a mobile phone, a notebook computer, a tablet computer, a car navigation device, a vehicle touch, etc., and thus, when the display broadcasts a screen, the light shielding film adjusts a viewing angle of light according to an incident angle of light to exhibit clear image quality at a viewing angle desired by a user.

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

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

[0005] Meanwhile, such a light shielding film can be a light shielding film that can always control a viewing angle regardless of a surrounding environment or a user's environment, and can be classified into a switchable light shielding film that allows a user to open / close viewing angle control according to a surrounding environment or a user's environment.

[0006] Meanwhile, there are various factors that control the characteristics of the switchable light shielding film having such a switching function. For example, light absorption and moving speed of electrophoretic particles included in a light shielding pattern are also related to the characteristics of the light shielding film.

[0007] That is, driving characteristics of the switchable light shielding film vary according to dispersibility of electrophoretic particles and moving speed of the electrophoretic particles, and a thickness of the switchable light shielding film can be controlled according to light absorption of the electrophoretic particles.

[0008] Therefore, there is a need for electrophoretic particles having improved moving speed and light absorption, and an optical path control member including the same. SUMMARY

[0009] TECHNICAL PROBLEM

[0010] Embodiments aim to provide electrophoretic particles having improved moving speed and light absorption by increasing surface roughness of a core of electrophoretic particles having a core-shell structure, and an optical path control member including the same.

[0011] TECHNICAL SOLUTION

[0012] The electrophoretic particle according to the embodiment includes carbon black, and includes a core portion and a shell portion disposed around an outer surface of the core portion, a protrusion is formed on a surface of the core portion, the core portion has a color index of 2 or less, the core portion has a light absorption rate of 90% to 99%, and the electrophoretic particle has a particle diameter of 50 nm to 800 nm.

[0013] Advantageous Effects

[0014] The electrophoretic particle according to the embodiment forms at least one of a recess and a protrusion on a surface of a core constituting the electrophoretic particle. Thereby, the surface roughness of the core portion can be increased. Thus, the specific surface area of the core portion can be increased without reducing the particle diameter of the core portion.

[0015] Thus, the coating area of the shell portion coated on the outer surface of the core portion can be increased, thereby improving the charging characteristics and increasing the moving speed of the electrophoretic particle.

[0016] Further, since there is no need to reduce the size of the electrophoretic particle, the aggregation of the electrophoretic particle having a small particle diameter, which is distributed in a large amount in the electrolyte, can be prevented.

[0017] Further, by reducing the light reflectance of the electrophoretic particle, the height of the accommodation unit can be reduced.

[0018] Thus, by increasing the moving speed of the electrophoretic particle, the driving characteristics of the switchable device to which the electrophoretic particle is applied can be improved. Further, by reducing the height of the accommodation unit, the thickness of the switchable device to which the electrophoretic particle is applied can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a cross-sectional view of an electrophoretic particle according to an embodiment.

[0020] Figure 2 is a perspective view of a core of an electrophoretic particle according to an embodiment.

[0021] Figures 3 to 5 is a graph showing a scanning electron micrograph (SEM) of carbon black particles according to examples and comparative examples.

[0022] Figure 6 is a perspective view of a light path control member to which an electrophoretic particle according to an embodiment is applied.

[0023] Figure 7 and Figure 8 are graphs showing perspective views of a first substrate and a first electrode and a second substrate and a second electrode of a light path control member according to an embodiment, respectively.

[0024] Figures 9 to 14 is a graph showing different cross-sectional views of a light path control member according to an embodiment.

[0025] Figure 15 is a perspective view of a first substrate of a light path control member according to another embodiment.

[0026] Figure 16 is a schematic illustration of a second substrate of a light path control member according to a different embodiment.

[0027] Figure 17 is a diagram showing a cross-sectional view taken along line A-A’ of Figure 15 , showing a cross-sectional view of the first electrode disposed on the first substrate.

[0028] Figure 18 is a diagram showing a cross-sectional view taken along line B-B’ of Figure 16 , showing a cross-sectional view of the second electrode disposed on the second substrate.

[0029] Figure 19 is a diagram showing a cross-sectional view taken along line A-A’ of Figure 15 , showing another cross-sectional view of the first electrode disposed on the first substrate.

[0030] Figure 20 is a diagram showing a cross-sectional view taken along line B-B’ of Figure 16 , showing another cross-sectional view of the second electrode disposed on the second substrate.

[0031] Figures 21 to 28 is a diagram showing different cross-sectional views of a light path control member according to another embodiment.

[0032] Figure 29 is a cross-sectional view of a display device to which a light path control member according to an embodiment is applied.

[0033] Figure 30 and Figure 31 is a diagram for describing one embodiment of a display device to which a light path control member according to an embodiment is applied. DETAILED DESCRIPTION

[0034] Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings. However, the spirit and scope of the present application are not limited to parts of the described embodiments and can be implemented in various other forms, and one or more elements of the embodiments can be selectively combined and replaced with each other within the spirit and scope of the present application.

[0035] Further, unless explicitly defined and described otherwise, the terms used in the embodiments of the present application, including technical terms and scientific terms, can be interpreted the same as the meaning that one of ordinary skill in the art to which the present application pertains and is commonly used, and the terms defined in a generally used dictionary can be interpreted to have meanings consistent with the meanings in the context of relevant technology.

[0036] Also, the terms used in the embodiments of the present application are used to describe the embodiments of the present application and are not used to limit the present application. In the present specification, unless specifically stated in the phrase, the singular form can also include the plural form, and when described as "at least one of (or) a plurality of" A, B, and C, it can include at least one of all combinations that can be combined with A, B, and C.

[0037] Also, in describing elements of the embodiments of the present application, terms such as first, second, A, B, (a), and (b) can be used. These terms are used only to distinguish the elements from other elements, and the terms are not limited to the nature, order, or sequence of the elements.

[0038] Also, when one element is described as being "connected", "coupled", or "joined" to another element, it can include not only a case where the element is directly connected, coupled, or joined to the other element, but also a case where the element is "connected", "coupled", or "joined" to the other element through yet another element.

[0039] Also, when described as being formed or disposed "on (above)" or "under (below)" each element, "on (above)" or "under (below)" can include not only a case where two elements are directly connected to each other, but also a case where one or more other elements are formed or disposed between the two elements.

[0040] Also, when indicated as "on (above)" or "under (below)", it can include not only a direction based on one element, but also a direction based on the other element.

[0041] Hereinafter, an electrophoretic particle according to an embodiment and an optical path control member including the same will be described with reference to the accompanying drawings. The optical path control member described below relates to a switchable optical path control member driven in various modes according to movement of electrophoretic particles by an applied voltage.

[0042] First, an electrophoretic particle according to an embodiment will be described with reference to Figure 1 and Figure 2 An electrophoretic particle according to an embodiment will be described.

[0043] Referring to Figure 1 , the electrophoretic particle can have a multi-layer structure. Specifically, the electrophoretic particle 10 can be formed in a core-shell structure. That is, the electrophoretic particle can include a core portion 11 and a shell portion 12 disposed to surround the core portion 11.

[0044] The core 11 can include a black material. Specifically, the core 11 can include a material that absorbs light. For example, the core 11 can include at least one of carbon black, copper oxide, zinc oxide, aniline black, and activated carbon. Specifically, the core 11 can include carbon black.

[0045] Referring to Figure 2 A pattern can be formed on the surface of the core 11. Specifically, a plurality of patterns for increasing the surface roughness of the core 11 can be formed on the surface of the core 11. The patterns can be defined as at least one pattern of a groove and a protrusion formed on the surface of the core 11. That is, the surface of the core 11 can not be formed smoothly, but can be formed to have a constant roughness due to the groove and / or the protrusion. That is, a plurality of grooves, a plurality of protrusions, or a plurality of grooves and a plurality of protrusions can be formed on the surface of the core 11.

[0046] The groove and / or the protrusion formed on the surface of the core 11 can be formed on the surface of the core 11 at irregular intervals, uneven sizes, and uneven shapes. That is, the surface of the core 11 can be formed in a non-flat shape or a concave-convex pattern shape by the groove and / or the protrusion.

[0047] The groove and / or the protrusion formed on the surface of the core 11 can be formed by various methods. For example, a spherical shape can be formed on the surface of the core 11 by a chemical etching method using an alkali solution or the like.

[0048] In addition, when the core 11 is manufactured, a plurality of nanoparticles, for example, a plurality of nanoscale carbon black particles, are aggregated to form the core 11. Thereby, the surface shape of the core 11 can be formed in a non-flat shape as a whole.

[0049] The groove and / or the protrusion formed on the surface of the core 11 can increase the surface roughness of the core 11. In addition, the specific surface area of the core 11 can be increased by the groove and / or the protrusion formed on the surface of the core 11. That is, the specific surface area of the core 11 can be increased while maintaining the particle diameter of the core 11. That is, the core 11 can have a larger specific surface area due to the pattern compared to a core having the same particle diameter.

[0050] For example, the specific surface area of the core 11 can be about 200 m 2 / g to 650 m 2 / g. Specifically, the particle diameter of the core 11 is 50 nm to 800 nm, and in this case, the specific surface area of the core 11 can be about 200 m 2 / g to 650 m 2 / g. Preferably, the particle diameter of the core 11 can be 200 nm to 300 nm.

[0051] The increase in the specific surface area increases the coating area of the shell part to be described below, thereby making it possible to improve the dispersibility and moving speed of the electrophoretic particles.

[0052] In addition, the core part 11 can increase the light absorption rate and reduce the light reflection rate of the core part by the plurality of grooves and / or protrusions formed on the surface of the core part.

[0053] Specifically, by the plurality of grooves and / or protrusions formed in the core part 11, the absorption of light incident to the electrophoretic particles can be increased and the light reflection rate can be reduced.

[0054] In addition, the core part 11 can improve the color index (L*) of the core part by the grooves and / or protrusions formed on the surface of the core part.

[0055] Meanwhile, the surface of the core part 11 can be modified by a surface treatment process. Specifically, the surface of the core part 11 is modified before the coating of the shell, so that it can be divided into a core 11a and a surface treatment layer 11b.

[0056] Specifically, the above-described shell part 12 is formed on the outer surface of the core part 11. That is, the outer surface of the core part 11 can be coated with a polymer material constituting the shell part 12. In addition, the shell part 12 can be formed by a silane coating, and the surface of the core part 11 can be substituted with a hydroxyl group (-OH) or a carboxyl group (-COOH) which is easily reacted with a silane coupling agent.

[0057] Accordingly, the surface of the core part 11 is modified by being substituted with a hydroxyl group (-OH) or a carboxyl group (-COOH), and the shell part 12 can be formed on the surface of the core part 11 by a silane coating.

[0058] The surface of the core part 11 can be modified by various methods. For example, by placing the core part 11 containing carbon black in an acidic solution such as acetic acid, and the acidic solution reacts with the surface of the core part, the surface of the core part 11 can be substituted with a hydroxyl group (-OH).

[0059] Alternatively, the core part 11 whose surface is substituted with a hydroxyl group (-OH) is placed in an acidic solution (for example, oleic acid) having at least 6 carbon chains. By esterification of the core part and the oleic acid, the surface of the core part 11 can be substituted with a carboxyl group (-COOH).

[0060] The shell part 12 can be coated on the surface of the core part 11 to make the electrophoretic particle surface charged.

[0061] Specifically, when the silane coupling agent is coated on the surface of the core part whose surface is substituted with a hydroxyl group or a carboxyl group, the silane reacts with the hydroxyl group or the carboxyl group. Accordingly, the shell part 12 can be coated on the surface of the core part 11.

[0062] Thus, the electrophoretic particles can have dispersibility in the dispersion liquid, and when a voltage is applied by a surface charge, the electrophoretic particles can move in a specific polarity direction in the dispersion liquid.

[0063] The silane coating on which the shell portion is formed can be related to the specific surface area of the core portion 11. That is, as the specific surface area of the core portion 11 increases, in proportion thereto, the area on which the silane can be coated can increase.

[0064] Thus, the electrophoretic particles according to the embodiment increase the specific surface area of the core portion 11. Thus, the coating area of the shell portion 12 coated on the surface of the core portion 11 can be increased. Thus, by increasing the area of the shell portion 12 coated on the surface of the core portion 11, the dispersibility and surface charge characteristics of the shell portion can be improved.

[0065] Hereinafter, the present application will be described in more detail by electrophoretic particles according to examples and comparative examples. These examples are presented only as examples in order to explain the present application in more detail. Thus, the present application is not limited to these examples.

[0066] Example 1

[0067] The surface of the carbon black particles was etched using an alkali solution.

[0068] Figure 3 FIG. 1 is a graph showing a scanning electron micrograph of carbon black particles whose surface has been etched by a chemical etching method.

[0069] Then, after measuring the specific surface area of the carbon black particles, the surface of the carbon black particles was modified. Specifically, the carbon black particles were reacted with an acidic solution (e.g., acetic acid) to replace the surface of the carbon black particles with hydroxyl groups (-OH).

[0070] Then, the carbon black particles were reacted with a silane coupling agent to form a charged coating layer on the surface of the carbon black particles, thereby preparing electrophoretic particles.

[0071] Then, the light absorption, light reflectance, color index (L*), and optical density of the electrophoretic particles were measured in a wavelength band in the visible light region.

[0072] Example 2

[0073] A plurality of nano carbon black particles were aggregated to form carbon black.

[0074] Figure 4 FIG. 2 is a graph showing a scanning electron micrograph of carbon black particles formed by aggregation of nano carbon black particles.

[0075] Then, after measuring the specific surface area of the carbon black particles, the surface of the carbon black particles was modified in the same manner as in Example 1, and then a charged coating layer was formed on the surface of the carbon black particles to prepare electrophoretic particles.

[0076] Then, the light absorptivity, light reflectivity, chromaticity index (L*), and optical density of the electrophoretic particles were measured in the wavelength band of the visible light region.

[0077] Comparative Example 1

[0078] Prepare spherical carbon black particles that do not form patterns on the surface.

[0079] Figure 5 This is a scanning electron microscope image showing spherical carbon black particles without surface patterns.

[0080] Then, after measuring the specific surface area of ​​the carbon black particles, the surface of the carbon black particles was modified in the same manner as in Example 1, and then an charged coating was formed on the surface of the carbon black particles to prepare electrophoretic particles.

[0081] Then, the light absorptivity, light reflectivity, chromaticity index (L*), and optical density of the electrophoretic particles were measured in the wavelength band of the visible light region.

[0082] Table 1

[0083]

[0084]

[0085] Table 2

[0086]

[0087] Table 3

[0088]

[0089] Table 4

[0090]

[0091] Table 5

[0092]

[0093] Referring to Table 4, the specific surface area of ​​the carbon black particles in the electrophoretic particles according to Examples 1 and 2 is greater than that of the carbon black particles in the electrophoretic particles according to Comparative Example 1.

[0094] Therefore, as described above, the specific surface area of ​​the carbon black particles constituting the core increases, thus increasing the coating area of ​​the charged coating on the outer surface of the carbon black particles.

[0095] Therefore, the dispersibility and migration speed of electrophoretic particles based on the charge in the dispersion are improved.

[0096] Furthermore, referring to Tables 1 and 2, the electrophoretic particles according to Examples 1 and 2 have lower light reflectance and higher light absorptivity compared to the electrophoretic particles according to Comparative Example 1.

[0097] In other words, the electrophoretic particles according to Examples 1 and 2 have a light absorption rate of more than 90%, i.e., 90% to 99%, in the visible light wavelength region of 400nm to 700nm, and a light reflectance of less than 10%.

[0098] Furthermore, referring to Table 3, the electrophoretic particles according to Examples 1 and 2 have a smaller chromaticity index (L) value compared to the electrophoretic particles according to the comparative example. That is, the electrophoretic particles according to Examples 1 and 2 are closer to black than the electrophoretic particles according to the comparative example. In other words, the electrophoretic particles according to the embodiments have a chromaticity index of 2 or less. Specifically, the electrophoretic particles according to the embodiments have a chromaticity index of 2 or less. More specifically, the electrophoretic particles have a chromaticity index of 0 to 2.

[0099] Furthermore, referring to Table 5, the electrophoretic particles according to Examples 1 and 2 have a higher optical density compared to the electrophoretic particles according to Comparative Example 1.

[0100] Therefore, by increasing light absorption and reducing light reflectance, the same light-blocking effect can be achieved while reducing the amount of electrophoretic particles added to the dispersion.

[0101] Therefore, it can prevent the aggregation of electrophoretic particles in the dispersion, thereby improving dispersibility and increasing the movement speed, thus increasing the driving speed of display devices that use electrophoretic particles.

[0102] Furthermore, in the electrophoretic particles according to Examples 1 and 2, only a smaller amount of electrophoretic particles are needed as the optical density and chromaticity index increase. Therefore, by reducing the thickness of the light conversion unit of the optical path control component using electrophoretic particles, the overall thickness of the optical path control component can be reduced.

[0103] In the following text, reference will be made to Figures 6 to 14 The description includes a switchable device for the aforementioned electrophoretic particles.

[0104] refer to Figures 6 to 8 According to the embodiment, the optical path control component may include a first substrate 110, a second substrate 120, a first electrode 210, a second electrode 220, and an optical conversion unit 300.

[0105] The first substrate 110 can support the first electrode 210. The first substrate 110 can be rigid or flexible.

[0106] Furthermore, the first substrate 110 may be transparent. For example, the first substrate 110 may include a transparent substrate capable of transmitting light.

[0107] The first substrate 110 may include glass, plastic, or a flexible polymer film. For example, the flexible polymer film may be made of any of the following: polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyethersulfone (PES), cyclic olefin copolymer (COC), triacetyl cellulose (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, and polystyrene (PS). This is merely an example, and the embodiments are not limited thereto.

[0108] In addition, the first substrate 110 can be a flexible substrate with flexible properties.

[0109] Furthermore, the first substrate 110 can be a bent or folded substrate. That is, the optical path control member including the first substrate 110 can also be formed to have flexible, bent, or folded characteristics. Therefore, the optical path control member according to the embodiment can be modified into various designs.

[0110] The first substrate 110 may have a thickness of about 1 mm or less.

[0111] The first electrode 210 can be disposed on one surface of the first substrate 110. Specifically, the first electrode 210 can be disposed on the upper surface of the first substrate 110. That is, the first electrode 210 can be disposed between the first substrate 110 and the second substrate 120.

[0112] The first electrode 210 may contain a transparent conductive material. For example, the first electrode 210 may contain a metal oxide, such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, etc.

[0113] The first electrode 210 can be disposed on the first substrate 110 in the form of a thin film. Specifically, the light transmittance of the first electrode 210 can be about 80% or more.

[0114] The first electrode 210 may have a thickness of about 10 nm to about 50 nm.

[0115] Alternatively, the first electrode 210 may comprise various metals to achieve low resistance. For example, the first electrode 210 may comprise 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.

[0116] Furthermore, the first electrode 210 may include multiple conductive patterns. For example, the first electrode 210 may include multiple intersecting grid lines and multiple grid openings formed by the grid lines.

[0117] Therefore, even if the first electrode 210 contains metal, visibility can be improved since the first electrode is not visible from the outside. Furthermore, the increased light transmittance through the opening enhances the brightness of the light path control member according to the embodiment.

[0118] The second substrate 120 may be disposed on the first substrate 110. Specifically, the second substrate 120 may be disposed on the first electrode 210 on the first substrate 110.

[0119] The second substrate 120 may contain a light-transmitting material. The second substrate 120 may contain a transparent material. The second substrate 120 may contain the same or similar material as the first substrate 110 described above.

[0120] For example, the second substrate 120 may include glass, plastic, or a flexible polymer film. For instance, the flexible polymer film may be made of any of the following: polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene copolymer (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyethersulfone (PES), cyclic olefin copolymer (COC), triacetyl cellulose (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, and polystyrene (PS). This is merely an example, and the embodiments are not limited thereto.

[0121] In addition, the second substrate 120 can be a flexible substrate with flexible properties.

[0122] Furthermore, the second substrate 120 can be a bent or folded substrate. That is, the optical path control member including the second substrate 120 can also be formed to have flexible, bent, or folded characteristics. Therefore, the optical path control member according to the embodiment can be modified into various designs.

[0123] The second substrate 120 may have a thickness of less than about 1 mm.

[0124] The second electrode 220 can be disposed on one surface of the second substrate 120. Specifically, the second electrode 220 can be disposed on the lower surface of the second substrate 120. That is, the second electrode 220 can be disposed on the surface of the second substrate 120 facing the first substrate 110. That is, the second electrode 220 can be disposed on the first substrate 110 facing the first electrode 210. That is, the second electrode 220 can be disposed between the first electrode 210 and the second substrate 120.

[0125] The second electrode 220 may contain a transparent conductive material. For example, the second electrode 220 may contain a metal oxide, such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, etc.

[0126] The second electrode 220 can be disposed on the first substrate 110 in the form of a thin film. In addition, the light transmittance of the second electrode 220 can be about 80% or more.

[0127] The second electrode 220 may have a thickness of about 10 nm to about 50 nm.

[0128] Alternatively, the second electrode 220 may comprise various metals to achieve low resistance. For example, the second electrode 220 may comprise 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.

[0129] Furthermore, the second electrode 220 may include multiple conductive patterns. For example, the second electrode 220 may include multiple intersecting grid lines and multiple grid openings formed by the grid lines.

[0130] Therefore, even if the second electrode 220 contains metal, visibility can be improved because the second electrode 220 is not visible from the outside. Furthermore, the increased light transmittance through the opening enhances the brightness of the light path control component according to the embodiment.

[0131] The light conversion unit 300 can be disposed between the first substrate 110 and the second substrate 120. Specifically, the light conversion unit 300 can be disposed between the first electrode 210 and the second electrode 220.

[0132] refer to Figures 9 to 14 The light conversion unit 300 may include a partition wall unit 310 and a housing unit 320.

[0133] The partition wall unit 310 can be defined as a partition wall region used to separate the area of ​​the receiving unit 320. The receiving unit 320 can be defined as a variable region that can be converted into a light-shielding unit and a light-transmitting unit depending on the applied voltage.

[0134] The partition wall unit 310 and the receiving unit 320 can be arranged alternately. The partition wall unit 310 and the receiving unit 320 can be configured with different widths. For example, the width of the partition wall unit 310 can be greater than the width of the receiving unit 320.

[0135] The partition wall unit 310 and the receiving unit 320 can be arranged alternately. Specifically, the partition wall unit 310 and the receiving unit 320 can be arranged alternately. That is, each partition wall unit 310 can be arranged between adjacent receiving units 320, and each receiving unit 320 can be arranged between adjacent partition wall units 310.

[0136] The partition wall unit 310 may contain a transparent material. The partition wall unit 310 may contain a material that can transmit light.

[0137] The partition wall unit 310 may comprise a resin material. For example, the partition wall unit 310 may comprise a UV-curable resin material. As an example, the partition wall unit 310 may comprise a UV resin or a transparent photoresist resin. Alternatively, the partition wall unit 310 may comprise a polyurethane resin or an acrylic resin.

[0138] The partition wall unit 310 can transmit light incident on either the first substrate 110 or the second substrate 120 to another substrate.

[0139] For example, in Figures 9 to 14 In this configuration, light can be emitted in the direction of the first substrate 110 and incident in the direction of the second substrate 120. The partition wall unit 310 can transmit light, and the transmitted light can move along the direction of the second substrate 120.

[0140] The containing unit 320 may include the dispersion 320a and the light conversion particles 10 described above. Specifically, the containing unit 320 is filled with the dispersion 320a, and a plurality of light conversion particles 10 may be dispersed in the dispersion 320a.

[0141] Dispersion 320a can be a material used to disperse light-converting particles 10. Dispersion 320a can contain a transparent material. Dispersion 320a can contain a non-polar solvent. Furthermore, dispersion 320a can contain a material capable of transmitting light. For example, dispersion 320a can contain at least one of halocarbon-based oil, a paraffin-based oil, and isopropanol.

[0142] The electrophoretic particles 10 can be configured to be dispersed in the dispersion 320a. Specifically, a plurality of electrophoretic particles 10 can be configured to be spaced apart from each other in the dispersion 320a.

[0143] The electrophoretic particles 10 can have a particle size of about 50 nm to about 800 nm. Preferably, the electrophoretic particles 10 can be formed with a particle size of about 200 nm to about 300 nm. When the particle size of the electrophoretic particles 10 is less than about 50 nm, the electrophoretic particles 10 may aggregate and reduce dispersibility. And when the particle size of the electrophoretic particles 10 exceeds about 800 nm, the migration speed in the dispersion may decrease due to the increase in the mass of the electrophoretic particles.

[0144] Meanwhile, as described above, the specific surface area of ​​the core of the electrophoretic particle 10 is increased, thereby increasing the coating area of ​​the polymer charged coating on the core. Thus, while maintaining the particle size of the electrophoretic particle 10, dispersibility and migration speed can be improved.

[0145] Specifically, the driving speed of the optical path component can be defined by Formula 1 below, and the moving speed of the electrophoretic particles in the dispersion can be defined by Formula 2 below.

[0146] [Formula 1]

[0147]

[0148] h: Distance between electrodes (height of the partition wall unit)

[0149] μ: Movement speed

[0150] V: Drive voltage

[0151] [Formula 2]

[0152]

[0153] ε: Dielectric constant

[0154] ζ: Surface charge

[0155] η: viscosity

[0156] Referring to Formulas 1 and 2, the driving speed of the optical path control component increases with the moving speed of the electrophoretic particles, and the moving speed of the electrophoretic particles is proportional to the amount of surface charge.

[0157] In other words, due to the increased specific surface area of ​​the nucleus, electrophoretic particles can increase their surface charge by increasing the coating area of ​​the polymer charged coating, which is related to the amount of surface charge.

[0158] Therefore, the moving speed of electrophoretic particles increases, and the driving speed of the optical path control component using electrophoretic particles can also be reduced.

[0159] The transmittance of the receiving unit 320 can be altered by the electrophoretic particles 10. Specifically, the receiving unit 320 can be transformed into a light-blocking part and a light-transmitting part by the change in transmittance caused by the movement of the electrophoretic particles 10.

[0160] For example, the optical path control component according to the embodiment can change from a first mode to a second mode or from a second mode to a first mode by applying a voltage to the first electrode 210 and the second electrode 220.

[0161] Specifically, in the optical path control component according to the embodiment, the receiving unit 320 becomes a light-shielding part in the first mode, and light at a specific angle can be blocked by the receiving unit 320. That is to say, the user's viewing angle from the outside will be narrowed.

[0162] Furthermore, in the optical path control component according to the embodiment, the receiving unit 320 becomes a light-transmitting part in the second mode, and in the optical path control component according to the embodiment, light can pass through both the partition wall unit 310 and the receiving unit 320. That is to say, the user's viewing angle from the outside is widened.

[0163] The switching from the first mode to the second mode can be achieved by moving the electrophoretic particles 10 in the receiving unit 320, that is, the conversion of the receiving unit 320 from the light-blocking part to the light-transmitting part.

[0164] Specifically, the receiving unit 320 can be electrically connected to the first electrode 210 and the second electrode 220.

[0165] In this configuration, when no voltage is applied to the optical path control component from the outside, the electrophoretic particles 10 of the receiving unit 320 are uniformly dispersed in the dispersion liquid 320a, and light can be blocked by the light-converting particles in the receiving unit 320. Therefore, in the first mode, the receiving unit 320 can be driven as a light-shielding part.

[0166] Alternatively, the electrophoretic particles 10 can move when a voltage is applied to the optical path control member from the outside. For example, the electrophoretic particles 10 can move towards one end or the other end of the receiving unit 320 by a voltage transmitted via the first electrode 210 and the second electrode 220. That is, the electrophoretic particles 10 can move from the receiving unit 320 towards the first electrode or the second electrode.

[0167] Specifically, when a voltage is applied to the first electrode 210 and / or the second electrode 220, an electric field is formed between the first electrode 210 and the second electrode 220 and the charged carbon black, that is, the electrophoretic particles can use the dispersion liquid 320a as a medium to move toward the positive electrode of the first electrode 210 and the second electrode 220.

[0168] That is, when no voltage is applied to the first electrode 210 and / or the second electrode 220, such as Figure 10 , Figure 12 , Figure 14 As shown, the electrophoretic particles 10 can be uniformly dispersed in the dispersion liquid 320a, and the containing unit 320 is driven as a light-shielding part.

[0169] Furthermore, when a voltage is applied to the first electrode 210 and / or the second electrode 220, such as Figure 9 , Figure 11 , Figure 13 As shown, the electrophoretic particles 10 can move toward the first electrode 210 in the dispersion 320a. That is, the electrophoretic particles 10 move in one direction, and the receiving unit 320 can be driven to serve as a light-transmitting part.

[0170] Therefore, the optical path control component according to the embodiment can be driven in two modes depending on the user's surrounding environment. That is, when the user needs light transmission only from a specific viewing angle, the receiving unit is driven as a light-shielding part, or in an environment where the user needs high brightness, a voltage can be applied to drive the receiving unit as a light-transmitting part.

[0171] Therefore, since the optical path control device according to the embodiment can be implemented in two modes according to the user's needs, the application of the optical path control device can be unaffected by the user's environment.

[0172] Meanwhile, the housing unit 320 can be formed into various shapes.

[0173] In addition, refer to Figure 9 and Figure 10 The receiving unit 320 extends from one end to the other, and the width of the receiving unit 320 can be changed.

[0174] For example, refer to Figure 9 and Figure 10 The receiving unit 320 can be formed in a trapezoidal shape. Specifically, the receiving unit 320 can be formed such that the width of the receiving unit 320 increases as it extends from the first electrode 210 to the second electrode 220.

[0175] In other words, the width of the receiving unit 320 can be narrowed while extending in the opposite direction from the user's viewing surface. Furthermore, when a voltage is applied to the light-transmitting portion, the light-absorbing particles of the receiving unit 320 can move along the direction in which the width of the receiving unit narrows.

[0176] In other words, the width of the accommodating unit 320 can be increased as it extends from the light incident section to the light output section of the emitted light.

[0177] Therefore, since the electrophoretic particles move in the opposite direction to the observation surface rather than the observation surface, it is possible to prevent the light emitted in the direction of the observation surface from being blocked, thereby improving the brightness of the optical path control component.

[0178] Furthermore, because electrophoretic particles move from wide regions to narrow regions, they can move easily.

[0179] Furthermore, as the electrophoretic particles move to the narrow area of ​​the containing unit, the amount of light transmitted in the direction of the user's viewing surface increases, thereby improving the front brightness.

[0180] Alternatively, the receiving unit 320 may be formed to extend from the first electrode 210 to the second electrode 220 and the width of the receiving unit 320 may be narrowed.

[0181] In other words, the width of the receiving unit 320 can be widened while extending in the direction opposite to the user's viewing surface. Furthermore, when a voltage is applied to the light-transmitting portion, the electrophoretic particles of the receiving unit 320 can move in the direction in which the width of the receiving unit widens.

[0182] In other words, the width of the receiving unit 320 can be narrowed as it extends from the light incident section of the incident light to the light output section of the emitted light.

[0183] Therefore, the contact area between the first electrode and the surface through which the electrophoretic particles of the containing unit move increases, thereby increasing the moving speed of the electrophoretic particles, i.e., the driving speed.

[0184] Meanwhile, the receiving unit 320 can be configured to be spaced apart from the first electrode 210 or the second electrode 220. That is, the receiving unit 320 can be configured to contact only one of the first electrode 210 and the second electrode 220.

[0185] For example, refer to Figure 11 and Figure 12 The receiving unit 320 can be spaced apart from the first electrode 210.

[0186] The same or similar material as the partition wall 310 can be disposed in the area where the housing unit 320 and the first electrode 210 are spaced apart from each other.

[0187] Furthermore, the receiving unit 320 can be positioned at an angle θ. Specifically, refer to... Figure 13 and Figure 14 The receiving unit 320 can be disposed with an angle θ greater than 0° and less than 90° relative to the first electrode 210. Specifically, the receiving unit 320 can extend upward while having an angle θ greater than 0° and less than 90° relative to one surface of the first electrode 210.

[0188] Therefore, when the optical path control component is used together with the display panel, ripples caused by the overlap of the pattern of the display panel and the receiving unit 320 of the optical path component can be prevented, thereby improving user visibility.

[0189] Specifically, the display panel may include a pixel pattern extending in one direction. Therefore, the pixel pattern of the optical path components and the pattern of the receiving unit 320 may overlap, resulting in a wavy appearance. This wavy appearance can be prevented by configuring the receiving unit pattern to tilt at a predetermined angle.

[0190] In other words, the containment unit pattern and the pixel pattern can be set to intersect each other, and in this case, the containment unit pattern and the pixel pattern can be set to intersect each other at an angle greater than 0° and less than 90°.

[0191] The invention will be described in more detail below with reference to electrophoretic particles according to examples and comparative examples. These embodiments are presented by way of example only to explain the invention in more detail. Therefore, the invention is not limited to these examples.

[0192] Example 3

[0193] A first electrode is formed on a first substrate, and a second electrode is formed below the second substrate. Then, a plurality of receiving units separated by partition wall units between the first electrode and the second electrode are formed to form an optical path control member.

[0194] At this point, the containment unit contains paraffin oil and electrophoretic particles of Example 1 dispersed in the paraffin oil.

[0195] Then, a 5V DC voltage is applied to the optical path control component, and the transmittance of the accommodating unit is observed to see if it changes.

[0196] Example 4

[0197] In addition to dispersing the electrophoretic particles of Example 2 in the containment unit, the optical path control component is formed in the same manner as in Example 3, and then the transmittance of the containment unit is observed to see if it changes.

[0198] Comparative Example 2

[0199] In addition to dispersing the electrophoretic particles of Comparative Example 1 in the containment unit, the optical path control component was formed in the same manner as in Example 3, and then the transmittance of the containment unit was observed to see if it changed.

[0200] Table 6

[0201]

[0202]

[0203] Referring to Table 6, compared with the optical path control component of Comparative Example 2, the optical path control components of Examples 3 and 4 have higher driving speed and improved transmittance variation rate.

[0204] In other words, since the optical path control components in Examples 3 and 4 include electrophoretic particles with improved specific surface area, the transmittance variability increases due to the increased absorptivity and decreased reflectivity of the electrophoretic particles.

[0205] Furthermore, since the optical path control components of Examples 3 and 4 include electrophoretic particles with improved specific surface area, the movement speed of the electrophoretic particles can be increased, thereby increasing the driving speed of the optical path control components.

[0206] In the following text, reference will be made to Figures 15 to 28A light path control component according to another embodiment is described. In the description of the light path control component according to another embodiment, descriptions identical to those in the above embodiment will be omitted, and identical components will use the same reference numerals. Furthermore, the light path control component according to another embodiment can be combined with the light path control component according to the above embodiment.

[0207] In the optical path control component according to another embodiment, multiple patterns can be formed on the substrate.

[0208] refer to Figure 15 Multiple patterns can be formed on the first substrate 110. Specifically, multiple first protrusion patterns P1 can be formed on any surface of the first substrate 110.

[0209] The first protrusion pattern P1 may include the same material as the first substrate 110. The first protrusion pattern P1 may be integrally formed with the first substrate 110.

[0210] The first protrusion pattern P1 can be configured to extend in one direction on the first substrate 110. (See reference) Figure 2 The first protrusion pattern P1 can be arranged to extend along the short width direction of the first substrate 110 in the direction of the arrow.

[0211] The first substrate 110 may include a first region 1A having a first protrusion pattern P1 and a second region 2A without the first protrusion pattern P1. Specifically, the first protrusion pattern P1 may be provided only in the region that overlaps with the receiving unit of the light conversion section 300, which will be described below. That is, the first region 1A may overlap with the region where the receiving unit is provided, and the second region may overlap with the region where the partition wall portion of the light conversion section 300 is provided.

[0212] In addition, refer to Figure 16 Multiple patterns can be formed on the second substrate 120. Specifically, multiple second protrusion patterns P2 can be formed on any surface of the second substrate 120.

[0213] The second protrusion pattern P2 may include the same material as the second substrate 120. The second protrusion pattern P2 may be integrally formed with the second substrate 120.

[0214] The second protrusion pattern P2 can be configured to extend in one direction on the second substrate 120. (See reference) Figure 3 The second protruding pattern P2 can be arranged to extend along the long side of the second substrate 120 in the direction of the arrow. That is, the first protruding pattern P1 and the second protruding pattern P2 can be configured to extend in different directions.

[0215] The second substrate 120 may include a third region 3A having a second protrusion pattern P2 and a fourth region 4A without the second protrusion pattern P2. Specifically, the second protrusion pattern P2 may be provided only in the region that overlaps with the receiving unit of the light conversion section 300, which will be described below. That is, the third region 3A may overlap with the region where the receiving unit is provided, and the fourth region may overlap with the region where the partition wall portion of the light conversion section 300 is provided.

[0216] That is, the first region 1A of the first substrate 110 and the third region 3A of the second substrate 120 overlap each other, and the second region 2A of the first substrate 110 and the fourth region 4A of the second substrate 120 can overlap each other.

[0217] refer to Figure 17 The first electrode 210 can be disposed on the same surface as the first protrusion pattern P1. That is, the first electrode 210 and the first protrusion pattern P1 can be disposed on the same surface of the first substrate 110.

[0218] Specifically, the first protrusion pattern P1 can be disposed on a first region of the first substrate 110, and the first electrode 210 can be disposed on a second region of the first substrate 110. That is, the first electrode 210 can be disposed on the region overlapping with the receiving unit of the light conversion unit 300. In other words, the first electrode 210 can be disposed as a plurality of patterned electrodes on one surface of the first substrate.

[0219] In addition, refer to Figure 18 The second electrode 220 can be disposed on the same surface as the second protrusion pattern P2. That is, the second electrode 220 and the second protrusion pattern P2 can be disposed on the same surface of the second substrate 120.

[0220] Specifically, the second protrusion pattern P2 can be disposed on the third region of the second substrate 120, and the second electrode 220 can be disposed on the fourth region of the second substrate 120. That is, the second electrode 220 can be disposed on the region overlapping with the receiving unit of the light conversion section 300. In other words, the second electrode 220 can be disposed as a plurality of patterned electrodes on one surface of the second substrate.

[0221] Or, refer to Figure 19 The first electrode 210 can be disposed on one surface of the first substrate 110.

[0222] The first electrode 210 can be disposed on a surface different from the first protrusion pattern P1. That is, the first electrode 210 and the first protrusion pattern P1 can be disposed on opposite surfaces of the first substrate 110, respectively.

[0223] Specifically, the first protrusion pattern P1 is disposed on one surface of the first substrate 110, and the first electrode 210 is disposed on another surface of the first substrate 110 opposite to the one surface.

[0224] Furthermore, the first electrode 210 can be configured as a surface electrode on another surface of the first substrate 110. That is, the first electrode 210 can be disposed on the first region and the second region of the first substrate 110 on another surface of the first substrate 110.

[0225] Therefore, the process of separately patterning the first electrode 210 can be omitted.

[0226] In addition, refer to Figure 20 The second electrode 220 can be disposed on one surface of the second substrate 120.

[0227] The second electrode 220 can be disposed on a surface different from the surface of the second protrusion pattern P2. That is, the second electrode 220 and the second protrusion pattern P2 can be disposed on opposite surfaces of the second substrate 120, respectively.

[0228] Specifically, the second protrusion pattern P2 is disposed on one surface of the second substrate 120, and the second electrode 220 is disposed on another surface of the second substrate 120 opposite to the one surface.

[0229] Furthermore, the second electrode 220 can be configured as a surface electrode on another surface of the second substrate 120. That is, the second electrode 220 can be disposed on the third and fourth regions of the second substrate 120 on another surface of the second substrate 120.

[0230] Therefore, the process of separately patterning the second electrode 220 can be omitted.

[0231] The first substrate 110 and the second substrate 120 may respectively include the first protrusion pattern P1 and the second protrusion pattern P2 described above.

[0232] refer to Figures 21 to 28 Based on the relationship between the first substrate 110, the second substrate 120 and the light conversion unit 300, the pattern can be set in various positions.

[0233] refer to Figure 21 and Figure 22 The first protrusion pattern P1 and the second protrusion pattern P2 can be arranged to face each other. That is, the first protrusion pattern P1 is disposed between the light conversion unit 300 and the first substrate 110, and the second protrusion pattern P2 is disposed between the light conversion unit 300 and the second substrate 120.

[0234] The first electrode 210 and the first protrusion pattern P1 can be disposed on the first substrate 110. The first electrode 210 can be disposed between the first protrusion patterns P1, and the first protrusion patterns P1 can be disposed between the first electrodes 210.

[0235] The first protruding pattern P1 can be disposed in the region overlapping with the partition wall unit 310. In addition, the first electrode 210 can be disposed in the region overlapping with the receiving unit 320.

[0236] The first electrode 210 can be disposed in the region overlapping with the receiving unit 320 to apply voltage to the receiving unit 320.

[0237] The first protruding pattern P1 can converge light propagating in the direction of the partition wall unit 310. Specifically, light can be emitted downward from the first substrate 110 and can be incident in the direction of the light conversion unit 300. The first protruding pattern P1 can converge light moving towards the light conversion unit to improve the straightness of the light. That is, the first protruding pattern can play the same role as the first prism substrate of the backlight module.

[0238] The second electrode 220 and the second protrusion pattern P2 can be disposed on the second substrate 120. The second electrode 220 can be disposed between the second protrusion patterns P1, and the second protrusion pattern P2 can be disposed between the second electrodes 220.

[0239] The second protruding pattern P2 can be disposed in the area overlapping with the partition wall portion 310. Furthermore, the second electrode 220 can be disposed in the area overlapping with the receiving unit 320.

[0240] The second electrode 220 can be disposed in the region overlapping with the receiving unit to apply voltage to the receiving unit.

[0241] The second protruding pattern P2 can converge light propagating in the direction of the partition wall portion 310. Specifically, light can be emitted downward from the second substrate 120 and can be incident in the direction of the light conversion unit 300. The second protruding pattern P2 can converge light moving towards the light conversion unit to improve the straightness of the light. That is, the second protruding pattern can be used as a second prism substrate of the backlight module.

[0242] In other words, the first and second protruding patterns can be used as prism substrates for the backlight module. Therefore, when the optical path control component is combined with another component and applied to a display device, the prism substrate for providing the light source in the backlight module can be omitted.

[0243] Therefore, when optical path control components are applied to a display device, some components included in the display device can be omitted, thereby reducing the thickness of the display device and increasing the light transmittance due to the reduction in thickness.

[0244] Furthermore, the adhesion between the light conversion unit on the first substrate 110 and the adhesive layer on the light conversion unit can be improved by the first protrusion pattern and the second protrusion pattern. That is, the surface roughness of the first substrate and the second substrate can be increased by the first protrusion pattern and the second protrusion pattern. Therefore, the contact area between the light conversion unit and the adhesive layer is increased, thereby improving the adhesion between the light conversion unit and the adhesive layer.

[0245] In addition, refer to Figure 23 and Figure 24 The first protrusion pattern P1 can be disposed on one surface of the first substrate 110, and the second protrusion pattern P2 can be disposed on one surface of the second substrate 120.

[0246] The first protrusion pattern P1 can be disposed on a surface different from the surface of the first electrode 210. Specifically, the first electrode 210 can be disposed on the upper surface of the first substrate 110, and the first protrusion pattern P1 can be disposed on the lower surface of the first substrate 110.

[0247] Furthermore, the second protrusion pattern P2 can be disposed on a surface different from the surface of the second electrode 220. Specifically, the second electrode 220 can be disposed on the lower surface of the second substrate 120, and the second protrusion pattern P2 can be disposed on the upper surface of the second substrate 120.

[0248] The first electrode 210 and the second electrode 220 can each be configured as surface electrodes on one surface of the first substrate and the second substrate, respectively. That is, the first electrode 210 and the second electrode 220 can be disposed in the region overlapping with the partition wall unit 310 and the receiving unit 320 of the light conversion unit. By disposing the electrodes and protrusion patterns on different surfaces of the substrate, the process of individually patterning the first electrode and the second electrode can be omitted.

[0249] In addition, refer to Figure 25 and Figure 26 The first protrusion pattern P1 can be disposed on one surface of the first substrate 110, and the second protrusion pattern P2 can be formed on one surface of the second substrate 120.

[0250] The first protrusion pattern P1 can be disposed on a surface different from the surface of the first electrode 210. Specifically, the first electrode 210 can be disposed on the upper surface of the first substrate 110, and the first protrusion pattern P1 can be disposed on the lower surface of the first substrate 110.

[0251] Additionally, the second protrusion pattern P2 can be disposed on the same surface as the second electrode 220. Specifically, the second electrode 220 and the second protrusion pattern P2 can be disposed on the lower surface of the second substrate 120.

[0252] In other words, the first electrode 210 can be configured to face the second electrode 220 and the second protrusion pattern P2.

[0253] The first electrode 210 can be configured as a surface electrode on one surface of the first substrate. Additionally, the second electrode 220 can be configured as multiple patterned electrodes on one surface of the second substrate. That is, the first electrode 210 can be disposed in the region overlapping with the partition wall unit 310 and the receiving unit 320 of the light conversion unit, and the second electrode 220 can be disposed only in the region overlapping with the receiving unit 320 of the light conversion unit.

[0254] In addition, refer to Figure 27 and Figure 28 The first protrusion pattern P1 can be disposed on one surface of the first substrate 110, and the second protrusion pattern P2 can be disposed on one surface of the second substrate 120.

[0255] The first protrusion pattern P1 can be disposed on the same surface as the first electrode 210. Specifically, the first electrode 210 and the first protrusion pattern P1 can be disposed on the upper surface of the first substrate 110.

[0256] Furthermore, the second protrusion pattern P2 can be disposed on a surface different from the surface of the second electrode 220. Specifically, the second electrode 220 can be disposed on the lower surface of the second substrate 120, and the second protrusion pattern P2 can be disposed on the upper surface of the second substrate 120.

[0257] In other words, the second electrode 220 can be configured to face the first electrode 210 and the first protrusion pattern P1.

[0258] The second electrode 220 can be configured as a surface electrode on one surface of the second substrate. Alternatively, the first electrode 210 can be configured as multiple patterned electrodes on one surface of the first substrate. That is, the second electrode 220 can be disposed in the region overlapping with the partition wall unit 310 and the receiving unit 320 of the light conversion unit, and the first electrode 210 can be disposed only in the region overlapping with the receiving unit 320 of the light conversion unit.

[0259] According to another embodiment, the optical path control component may include a plurality of protrusion patterns protruding from a surface of a first substrate and a second substrate on which electrodes are disposed.

[0260] Specifically, a first protrusion pattern can be disposed on a first substrate, and a second protrusion pattern can be disposed on a second substrate. The first protrusion pattern and the second protrusion pattern can extend in different directions and can be used to converge light propagating from the first substrate to the second substrate.

[0261] In other words, the multiple protrusion patterns formed on the first substrate and the second substrate can have the same function as the prism sheet of the backlight module.

[0262] Therefore, when the optical path control component is used in conjunction with the backlight module, the prism substrate used for light focusing in the backlight module can be omitted. This reduces the thickness of the display device and minimizes light loss as it passes through the prism substrate.

[0263] Furthermore, by increasing the surface roughness of the first and second substrates using the first and second protruding members, the contact area between the light conversion unit and the adhesive layer that is in close contact with the first and second substrates can be increased. Therefore, improved adhesion can be achieved.

[0264] Therefore, the optical path control component and the display device including the optical path control component according to the embodiment can be formed to have a thin thickness and can have improved front brightness and reliability.

[0265] In the following text, see references Figures 29 to 31 The present invention will describe a display device and a display apparatus that utilize the optical path control component according to an embodiment.

[0266] refer to Figure 29 According to the embodiment, the optical path control component 1000 can be disposed on the display panel 2000.

[0267] The display panel 2000 and the optical path control component 1000 can be configured to be bonded to each other. For example, the display panel 2000 and the optical path control component 1000 can be bonded to each other via an adhesive layer 1500. The adhesive layer 1500 can be transparent. For example, the adhesive layer 1500 can include an adhesive or an adhesive layer containing an optically transparent adhesive material.

[0268] The adhesive layer 1500 may include a release film. Specifically, when bonding the optical path control component and the display panel, the optical path control component and the display panel can be bonded after the release film is removed.

[0269] The display panel 2000 may include a first substrate 2100 and a second substrate 2200. When the display panel 2000 is a liquid crystal display panel, the light path control component may be formed below the liquid crystal panel. That is, when the side of the liquid crystal panel that the user views is defined as the upper part of the liquid crystal panel, the light path control component may be disposed below the liquid crystal panel. The display panel 2000 may be formed as a structure in which a first substrate 2100 including thin-film transistors (TFTs) and pixel electrodes and a second substrate 2200 including a color filter layer are bonded together by a liquid crystal layer inserted therebetween.

[0270] Furthermore, the display panel 2000 can be a liquid crystal display panel with a color filter on transistor (COT) structure, wherein thin-film transistors, color filters, and a black matrix are formed on the first substrate 2100, and the second substrate 2200 is bonded to the first substrate 2100 through a liquid crystal layer interposed between the first substrate 2100 and the second substrate 2200. That is, thin-film transistors can be formed on the first substrate 2100, a protective film can be formed on the thin-film transistors, and a color filter layer can be formed on the protective film. Additionally, pixel electrodes in contact with the thin-film transistors can be formed on the first substrate 2100. In this case, to improve the aperture ratio and simplify the masking process, the black matrix can be omitted, and the common electrode can be formed as a black matrix.

[0271] Furthermore, when the display panel 2000 is a liquid crystal display panel, the display device may also include a backlight unit that provides light from the rear surface of the display panel 2000. The backlight unit may be disposed below the light path control member.

[0272] In other words, such as Figure 29 As shown, the optical path control component can be located below the LCD panel.

[0273] Alternatively, when the display panel 2000 is an organic light-emitting display panel, the light path control components can be formed on the organic light-emitting display panel. That is, when the surface of the organic light-emitting display panel for user viewing is defined as the upper part of the organic light-emitting display panel, the light path control components can be disposed on the organic light-emitting display panel. The display panel 2000 may include self-emissive elements that do not require a separate light source. In the display panel 2000, thin-film transistors can be formed on the first substrate 2100, and organic light-emitting elements in contact with the thin-film transistors can be formed. The organic light-emitting element may include an anode, a cathode, and an organic light-emitting layer formed between the anode and the cathode. Furthermore, a second substrate 2200, configured as an encapsulation substrate for encapsulation, may be further disposed on the organic light-emitting element.

[0274] Furthermore, although not shown in the accompanying drawings, a polarizing plate may be further disposed between the optical 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 reflection. For example, when the display panel 2000 is a liquid crystal display panel, the polarizing plate may be a linear polarizing plate. Furthermore, when the display panel 2000 is an organic light-emitting display panel, the polarizing plate may be a polarizing plate that prevents external light reflection.

[0275] Furthermore, an additional functional layer 1300, such as an anti-reflection layer or an anti-glare layer, can be further provided on the optical path control component 1000. Specifically, the functional layer 1300 can be adhered to one surface of the substrate of the optical path control component. Although not shown in the figures, the functional layer 1300 can be adhered to the substrate 100 of the optical path control component via an adhesive layer. Additionally, a release film for protecting the functional layer can be further provided on the functional layer 1300.

[0276] In addition, a touch panel can be further installed between the display panel and the optical path control components.

[0277] Although the accompanying drawings show the light path control component disposed at the upper part of the display panel, the embodiment is not limited thereto. The light path control component can be disposed in various positions, such as the position of the adjustable light, i.e., at the lower part of the display panel, between the second substrate and the first substrate of the display panel, etc.

[0278] refer to Figure 29 and Figure 30 The optical path control component according to the embodiment can be applied to a vehicle.

[0279] refer to Figure 29 and Figure 30 The optical path control component according to the embodiment can be applied to a display device for a display.

[0280] For example, such as Figure 29 As shown, when no power is applied to the optical path control component, the housing unit acts as a light-shielding part, causing the display device to be driven in a light-shielding mode, and as... Figure 30 As shown, when electricity is applied to the optical path control component, the housing unit serves as a light-transmitting part, allowing the display device to be driven in an open mode.

[0281] Therefore, users can easily drive the display device in privacy mode or normal mode depending on the amount of power applied.

[0282] Furthermore, although not shown in the accompanying drawings, a display device employing the optical path control component according to the embodiment can also be used in a vehicle.

[0283] For example, a display device including the optical path control component according to an embodiment can display video confirmation information of the vehicle and the vehicle's movement route. The display device can be disposed between the driver's seat and the passenger seat of the vehicle.

[0284] Furthermore, the optical path control component according to the embodiment can be applied to a dashboard that displays vehicle speed, engine, alarm signals, etc.

[0285] Furthermore, the optical path control component according to the embodiment can be applied to the windshield (FG) or left and right side windows of a vehicle.

[0286] 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. Furthermore, 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.

[0287] Furthermore, while the foregoing has primarily described embodiments, these embodiments are merely examples and not intended to limit the invention. Those skilled in the art will understand that various modifications and applications not explicitly stated above can be made without departing from the fundamental characteristics of the embodiments. For example, each component specifically represented in the embodiments may be altered. Moreover, it should be understood that differences associated with such modifications and applications are included within the scope of the invention as defined by the appended claims.

Claims

1. An electrophoretic particle comprising carbon black, wherein the electrophoretic particle includes a core portion and a shell portion disposed around an outer surface of the core portion, wherein the core portion is formed by aggregating a plurality of nano carbon black particles, wherein a plurality of grooves and a plurality of protrusions are formed on the outer surface of the core portion, wherein the plurality of protrusions have a non-uniform size and a non-uniform shape, and are disposed by protruding from the outer surface of the core portion, wherein the plurality of grooves have a non-uniform size and a non-uniform shape, and are disposed by being recessed from the outer surface of the core portion, wherein the core portion has a color index of 2 or less, wherein the core portion has a light absorption rate of 90% to 99%, wherein the electrophoretic particle has a particle size of 50 nm to 800 nm, wherein the core has a specific surface area of 200 m 2 / g to 650 m 2 / g, wherein a surface treatment layer substituted with a hydroxyl group or a carboxyl group is formed on the outer surface of the core portion, wherein the shell portion is coated on the surface treatment layer, and wherein, when a voltage is applied, the electrophoretic particle moves in a specific polarity direction based on a surface charge.

2. The electrophoretic particle according to claim 1, wherein, The electrophoretic particle has a particle size of 200 nm to 300 nm. 3.A light path control member comprising: a first substrate; a first electrode disposed on an upper surface of the first substrate; a second substrate disposed on the first substrate; a second electrode disposed on a lower surface of the second substrate; and a light conversion unit disposed between the first electrode and the second electrode, wherein the light conversion unit includes a partition wall unit and a containing unit alternately disposed, wherein the containing unit includes a dispersion liquid and a plurality of electrophoretic particles dispersed in the dispersion liquid, wherein the electrophoretic particle includes a core portion and a shell portion disposed around an outer surface of the core portion, wherein the core portion has a color index of 2 or less, wherein the core portion has a light absorption rate of 90% to 99%, wherein the electrophoretic particle has a particle size of 50 nm to 800 nm, wherein the core portion is formed by aggregating a plurality of nano carbon black particles, wherein the core has a specific surface area of 200 m 2 / g to 650 m 2 / g, wherein a plurality of grooves and a plurality of protrusions are formed on the outer surface of the core portion, wherein the plurality of protrusions have a non-uniform size and a non-uniform shape, and are disposed by protruding from the outer surface of the core portion, wherein the plurality of grooves have a non-uniform size and a non-uniform shape, and are disposed by being recessed from the outer surface of the core portion, wherein a surface treatment layer substituted with a hydroxyl group or a carboxyl group is formed on the outer surface of the core portion, wherein the shell portion is coated on the surface treatment layer, and wherein, when a voltage is applied, the electrophoretic particle moves in a specific polarity direction based on a surface charge. The containing unit is driven as a light shielding portion when a voltage is applied, and is driven as a light transmitting portion when no voltage is applied.

4. The optical path control member according to claim 3, wherein A first protrusion pattern is formed on one surface of the first substrate, and a second protrusion pattern is formed on one surface of the second substrate.

5. The optical path control member according to claim 3, wherein The first substrate includes a first region provided with the first protrusion pattern and a second region not provided with the first protrusion pattern, 6. The optical path control member according to claim 5, wherein ​ The second substrate includes a third region provided with the second protrusion pattern and a fourth region not provided with the second protrusion pattern.

7. The optical path control member according to claim 6, wherein The first protrusion pattern and the second protrusion pattern are provided to extend in different directions.

8. The optical path control member according to claim 6, wherein The first electrode and the first protrusion pattern are provided on the same surface of the first substrate, and The second electrode and the second protrusion pattern are provided on the same surface of the second substrate.

9. The optical path control member according to claim 6, wherein The first electrode and the first protrusion pattern are provided on different surfaces of the first substrate, The second electrode and the second protrusion pattern are provided on different surfaces of the second substrate.

10. The optical path control member according to claim 5, wherein The first electrode is provided between the first protrusion pattern, The second electrode is provided between the second protrusion pattern.

11. The optical path control member according to claim 5, wherein The first protrusion pattern and the second protrusion pattern overlap the partition wall unit, The first electrode and the second electrode overlap the accommodation unit.

12. A display device, comprising: a display panel; and a light path control member provided above or below the display panel, wherein the light path control member includes: a first substrate; a first electrode provided on an upper surface of the first substrate; a second substrate provided on the first substrate; a second electrode provided on a lower surface of the second substrate; and a light conversion unit provided between the first electrode and the second electrode, wherein the light conversion unit includes a partition wall unit and an accommodation unit alternately provided, wherein the accommodation unit includes a dispersion liquid and a plurality of electrophoretic particles dispersed in the dispersion liquid, wherein the electrophoretic particle includes a core portion and a shell portion provided to surround an outer surface of the core portion, wherein the core portion has a color index of 2 or less, wherein the core portion has a light absorption rate of 90% to 99%, wherein the electrophoretic particle has a particle diameter of 50 nm to 800 nm, wherein the core has a specific surface area of 200 m 2 / g to 650 m 2 / g, wherein the core portion is formed by aggregating a plurality of nano carbon black particles, wherein a plurality of grooves and a plurality of protrusions are formed on the outer surface of the core portion, wherein the plurality of protrusions have a non-uniform size and a non-uniform shape, and are provided by protruding from the outer surface of the core portion, wherein the plurality of grooves have a non-uniform size and a non-uniform shape, and are provided by being recessed from the outer surface of the core portion, wherein a surface treatment layer substituted with a hydroxyl group or a carboxyl group is formed on the outer surface of the core portion, wherein the shell portion is coated on the surface treatment layer, and wherein, when a voltage is applied, the electrophoretic particle moves in a specific polarity direction based on a surface charge.

13. The display device of claim 12, wherein, The display panel includes a liquid crystal display panel or an organic light emitting display panel.

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