Light path control component and display device including the same

Abstract

According to an embodiment, the light path control component includes: a first substrate; a first electrode, which is arranged on the first substrate; a second substrate, which is arranged on the first substrate; a second electrode, which is arranged below the second substrate; and a light conversion unit, which is arranged between the first electrode and the second electrode, wherein the light conversion unit includes alternately arranged partitions and receiving parts, the receiving part includes a dispersion and light conversion particles dispersed in the dispersion, and the receiving part operates in a public mode and a private mode depending on whether a voltage is applied, when converting from the private mode to the public mode, a first voltage is applied, and when converting from the public mode to the private mode, a second voltage and a third voltage are applied, and the second voltage and / or the third voltage includes a pulse voltage.

Description

Technical Field

[0001] Embodiments relate to a light path control member and a display device including the light path control member. 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 sends a picture, the shading film adjusts the viewing angle of the light according to the incident angle of the light to show clear image quality at the viewing angle required by the user, wherein the display panel is a display device for mobile phones, laptops, tablet computers, vehicle navigation devices, vehicle touch controls, etc.

[0003] Furthermore, the light-shielding film may be used for windows of vehicles, buildings, and the like to partially block external light to prevent glare or to prevent the interior from being visible from the outside.

[0004] That is, the light shielding film can be a light path control member that controls the movement 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 shading films can be divided into: shading films that can always control the viewing angle regardless of the surrounding environment or user environment; and switchable shading films that allow users to turn on / off the viewing angle control according to the surrounding environment or user environment.

[0006] Such a switchable light-shielding film can be realized by filling the interior of a pattern portion with particles that are movable when a voltage is applied and a dispersion in which the particles are dispersed, and switching the pattern portion between a light-transmitting portion and a light-shielding portion by dispersing and aggregating the particles.

[0007] For example, by applying a positive voltage to negatively charged particles, the particles move toward the electrode, and the pattern portion can be driven as a light-transmitting portion. When the pattern portion switches to a light-shielding portion, a negative voltage can be applied to disperse the particles inside the dispersion.

[0008] In this case, when switching from the light shielding portion to the light transmitting portion, the particles may not be dispersed well or the time for the particles to disperse may increase, thereby causing a problem of deterioration in the shielding characteristics or driving characteristics of the light path control member.

[0009] Therefore, there is a need for an optical path control member having a new structure that can solve the problem of particle dispersibility. Summary of the Invention

[0010] Technical issues

[0011] The embodiment is directed to a light path control member capable of improving driving characteristics of a pattern portion that switches between a light transmitting portion and a light shielding portion.

[0012] Technical Solution

[0013] According to an embodiment, the light path control component includes: a first substrate; a first electrode, which is arranged on the first substrate; a second substrate, which is arranged on the first substrate; a second electrode, which is arranged below the second substrate; and a light conversion unit, which is arranged between the first electrode and the second electrode, wherein the light conversion unit includes alternately arranged partitions and receiving portions, the receiving portion includes a dispersion and light conversion particles dispersed in the dispersion, the receiving portion is driven in a public mode and a private mode depending on whether a voltage is applied, when the receiving portion is converted from the private mode to the public mode, a first voltage is applied, and when the receiving portion is converted from the public mode to the private mode, a second voltage and a third voltage are applied, and at least one of the second voltage and the third voltage includes a pulse voltage.

[0014] Beneficial effects

[0015] The light path control member according to the embodiment may improve driving speed and driving characteristics when the light path control member is switched from the public mode to the privacy mode.

[0016] In detail, when moving the photoconversion particles to switch from the public mode to the private mode, the photoconversion particles can be uniformly dispersed in the dispersion in the private mode by applying a pulse voltage capable of uniformly dispersing the photoconversion particles with constant size, time, and period.

[0017] Therefore, the driving speed and driving characteristics of the light path control member can be improved by preventing the light conversion particles from being concentrated in a specific area. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 3 and Figure 4 are 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;

[0020] Figure 5 is a perspective view for explaining that a sealing portion is provided on a light path control member according to an embodiment;

[0021] Figure 6 is shown along Figure 5 a view of a cross-sectional view taken along line AA';

[0022] Figure 7 is shown along Figure 5 a view of a cross-sectional view taken along line BB';

[0023] Figure 8 is a perspective view for describing that a sealing portion is provided on a light path control member according to another embodiment;

[0024] Figure 9 It shows Figure 8 a view of a cross-sectional view taken along line D-D';

[0025] Figure 10 is a perspective view for describing that a sealing portion is provided on a light path control member according to yet another embodiment;

[0026] Figure 11 and 12 is shown along Figure 5 a view of a cross-sectional view taken along line CC';

[0027] Figures 13 to 16 is a diagram showing the shapes of various receiving portions other than the sealing portion in the light path control member according to the embodiment. Figure 5 a view of a cross-sectional view taken along line CC';

[0028] Figures 17 to 20 is a view for describing a driving method of the light path control member according to the first embodiment;

[0029] Figures 21 to 25 is a view for describing a driving method of the light path control member according to the third embodiment;

[0030] Figures 26 to 34 is a diagram showing voltage changes according to an embodiment and a comparative example;

[0031] Figure 35 and Figure 36 is a cross-sectional view of a display device to which the light path control member according to the embodiment is applied;

[0032] Figures 37 to 39 is a view for describing one embodiment of a display device to which the light path control member according to the embodiment is applied. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the spirit and scope of the present invention are not limited to a part of the described embodiments and can be implemented in various other forms, and within the spirit and scope of the present invention, one or more elements of the embodiments can be selectively combined and replaced.

[0034] 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.

[0035] 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, and C.

[0036] 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.

[0037] 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.

[0038] In addition, when described as being formed or arranged "on (above)" or "under (below)" each element, "on (above)" or "under (below)" can include not only the case where the 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.

[0039] In addition, when “upper” or “lower” is expressed, it may include not only an upper direction based on one element but also a lower direction based on one element.

[0040] 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 electrophoretic particles moving by application of voltage.

[0041] refer to Figures 1 to 4 , the light path control member according to the embodiment may include a first substrate 110 , a second substrate 120 , a first electrode 210 , a second electrode 220 , and a light conversion unit 300 .

[0042] The first substrate 110 may support the first electrode 210. The first substrate 110 may be rigid or flexible.

[0043] In addition, the first substrate 110 may be transparent. For example, the first substrate 110 may include a transparent substrate capable of transmitting light.

[0044] 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), polyethersulfone (PES), cyclic olefin copolymer (COC), triacetyl cellulose (TAC) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, and polystyrene (PS), which are examples only, but the embodiment is not limited thereto.

[0045] In addition, the first substrate 110 may be a flexible substrate having flexible characteristics.

[0046] 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.

[0047] The first substrate 110 may extend in the first direction 1A, the second direction 2A, and the third direction 3A.

[0048] In detail, the first substrate 110 may include: a first direction 1A, which corresponds to the length or width direction of the first substrate 110; a second direction 2A, which extends in a direction different from the first direction 1A and corresponds to the length or width direction of the first substrate 110; and a third direction 3A, which 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.

[0049] 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.

[0050] 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 .

[0051] The first electrode 210 may be provided on one surface of the first substrate 110. In detail, the first electrode 210 may be provided on an upper surface of the first substrate 110. That is, the first electrode 210 may be provided between the first substrate 110 and the second substrate 120.

[0052] The first electrode 210 may include a transparent conductive material. For example, the first electrode 210 may include a conductive material having a light transmittance of about 80% or more. For example, the first electrode 210 may include a metal oxide such as indium tin oxide, indium zinc oxide, copper oxide, tin oxide, zinc oxide, titanium oxide, etc.

[0053] The first electrode 210 may have a thickness of 0.05 μm to 2 μm.

[0054] 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 the group consisting of chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), gold (Au), titanium (Ti), and alloys thereof.

[0055] 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.

[0056] 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 intersecting each other and a plurality of mesh openings formed by the mesh lines.

[0057] Therefore, even if the first electrode 210 includes metal, the first electrode cannot be visually recognized from the outside, thereby improving visibility. In addition, the light transmittance is increased by the opening, thereby improving the brightness of the light path control member according to the embodiment.

[0058] 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.

[0059] The second substrate 120 may include a material capable of transmitting light, a transparent material, or a material that is the same as or similar to the material of the first substrate 110 described above.

[0060] 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 (ABS), polymethyl methacrylate (PMMA), polyethylene naphthalate (PEN), polyethersulfone (PES), cyclic olefin copolymer (COC), TAC (triacetyl cellulose) film, polyvinyl alcohol (PVA) film, polyimide (PI) film, and polystyrene (PS). This is merely an example and is not necessarily limited thereto.

[0061] In addition, the second substrate 120 may be a flexible substrate having flexible characteristics.

[0062] 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.

[0063] 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.

[0064] In detail, the second substrate 120 may include: a first direction 1A, the first direction 1A corresponds to the length or 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 or width 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.

[0065] 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 .

[0066] 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 .

[0067] 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 .

[0068] The second electrode 220 may be provided on one surface of the second substrate 120. Specifically, the second electrode 220 may be provided on the lower surface of the second substrate 120. That is, the second electrode 220 may be provided on one surface of the second substrate 120, wherein the second substrate 120 and the first substrate 110 face each other. That is, the second electrode 220 may be provided to face the first electrode 210 on the first substrate 110. That is, the second electrode 220 may be provided between the first electrode 210 and the second substrate 120.

[0069] The second electrode 220 may include the same or similar material as the first electrode 210 described above.

[0070] 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.

[0071] The second electrode 220 may have a thickness of about 0.1 μm to about 0.5 μm.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] Therefore, even if the second electrode 220 includes metal, the second electrode 220 cannot be visually recognized from the outside, thereby improving visibility. In addition, the light transmittance is increased by the opening, thereby improving the brightness of the light path control member according to the embodiment.

[0076] 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.

[0077] 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.

[0078] For example, the first length and the second length may have a dimension of 300 mm to 400 mm.

[0079] 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.

[0080] For example, the first width and the second width may have a size of 150 mm to 200 mm.

[0081] 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.

[0082] For example, the first thickness and the second thickness may have a size of 30 μm to 200 μm.

[0083] Alternatively, the first substrate 110 and the second substrate 120 may have different sizes.

[0084] In detail, a first length L2 of the first substrate 110 extending in the first direction 1A may have the same or similar length as a second length L2 of the second substrate 120 extending in the first direction 1A within a size range of 300 mm to 400 mm.

[0085] In addition, a first width of the first substrate 110 extending in the second direction 2A may have a different size from a second width of the second substrate 120 extending in the second direction 2A within a size range of 150 mm to 200 mm.

[0086] For example, the second width of the second substrate 110 extending in the second direction may be smaller than the first width of the first substrate 110 extending in the second direction 2A.

[0087] refer to Figure 1 , the first substrate 110 and the second substrate 120 may be disposed to be misaligned with each other.

[0088] In detail, the first substrate 110 and the second substrate 120 may be disposed at positions crossing each other along the first direction 1 A. 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.

[0089] 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.

[0090] That is, the first substrate 110 may include a first protrusion protruding in one direction of the first direction 1A, and the second substrate 110 may include a second protrusion protruding in the other direction of the first direction 1A.

[0091] 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 .

[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 and second electrodes 210 and 220 exposed at the protrusions may be connected to an external printed circuit board through a pad portion, which will be described below.

[0094] 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.

[0095] 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 .

[0096] That is, the first substrate 110 may include a first protrusion protruding in one direction of the first direction 1A, and the second substrate may also include a second protrusion protruding in one direction of the first direction 1A.

[0097] That is, the first protrusion and the second protrusion may protrude in the same direction.

[0098] 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 .

[0099] 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.

[0100] The first and second electrodes 210 and 220 exposed at the protrusions may be connected to an external printed circuit board through a connection portion to be described below.

[0101] The light conversion unit 300 may be disposed between the first substrate 110 and the second substrate 120. In detail, the light conversion unit 300 may be disposed between the first electrode 210 and the second electrode 220.

[0102] An adhesive layer or a buffer layer may be provided between at least one of the light conversion unit 300 and the first substrate 110 or between the light conversion unit 300 and the second substrate 120 , and the first substrate 110 , the second substrate 120 , and the light conversion unit 300 may be adhered to each other via the adhesive layer and / or the first substrate 110 .

[0103] The light conversion unit 300 may include a plurality of partitions and a receiving portion. Light conversion particles that move according to application of a voltage may be disposed in the receiving portion, and the light transmission characteristics of the light path control member may be changed by the light conversion particles.

[0104] The light path controlling member may include a sealing portion.

[0105] refer to Figures 5 to 10 , the sealing portion can be provided on the outer surface of the light path control member.

[0106] refer to Figures 5 to 7 The sealing portion 500 may be provided to cover the outer surface of the light path control member. Specifically, the sealing portion 500 may be provided to partially cover the outer surface of the light path control member. That is, the sealing portion 500 may be provided to partially cover the outer surface of the light path control member while extending from the first substrate 110 toward the second substrate 120.

[0107] The light path control member 1000 may include a plurality of side surfaces. Specifically, the light path control member 1000 may include side surfaces extending in the first direction 1A and facing each other, and side surfaces extending in the second direction 2A and facing each other.

[0108] The sealing portion 500 may be provided to surround the side surface of the light path control member extending in the first direction 1A. For example, the sealing portion 500 may be provided to surround the side surface of the light path control member where the receiving portion 320 where the light conversion particles are provided is exposed at the light conversion unit 300 .

[0109] In detail, the receiving portion 320 may be provided to extend from the light conversion unit 300 toward the second direction 2A based on the first substrate 110 and the second substrate 120. That is, a plurality of receiving portions 320 may be provided to extend toward the second direction 2A while being spaced apart from each other.

[0110] Therefore, the receiving part 320 may be exposed in both surface directions of the first direction 1A of the light conversion unit 300. The sealing part 500 may be provided to cover the receiving part 320 exposed at the light conversion unit 300 to protect the light conversion particles inside the exposed receiving part.

[0111] That is, the sealing portion 500 may be provided on a portion of the side surface of the light conversion unit 300, a portion of the lower surface of the first substrate 110, and a portion of the upper surface of the second substrate 120. In other words, the sealing portion 500 may be provided on a portion of the side surface of the light conversion unit 300, a portion of the lower surface of the first substrate 110, and a portion of the upper surface of the second substrate 120 while surrounding the exposed receiving portion of the light conversion unit.

[0112] The sealing part 500 may include a resin material having a viscosity of 300 cP or higher.

[0113] The sealing portion 500 may include a first sealing portion 510 and a second sealing portion 520 .

[0114] Specifically, the first sealing portion 510 may be disposed on one side surface of the light conversion unit 300 in the first direction, and the second sealing portion 520 may be disposed on the other side surface of the light conversion unit in the first direction.

[0115] The first sealing portion 510 and the second sealing portion 520 may be disposed to be spaced apart from each other.

[0116] Alternatively, the first sealing portion 510 and the second sealing portion 520 may be integrally formed with each other. For example, the first sealing portion 510 and the second sealing portion 520 may contact each other while extending from both ends of the first substrate 110 or the second substrate 120 in the first direction toward the second direction.

[0117] The first sealing portion 510 and the second sealing portion 520 may be disposed to face each other. The first sealing portion 510 and the second sealing portion 520 may be disposed on both side surfaces of the light conversion unit 300 in the first direction 1A, respectively.

[0118] For details, refer to Figure 6 The first sealing portion 510 and the second sealing portion 520 can be configured to extend along the following surfaces while partially surrounding the outer peripheral surface of the light path control component, wherein the surfaces are the lower surface and the side surface in the first direction of the first substrate 110, the side surface in the first direction of the first electrode 210, the side surface in the first direction of the buffer layer 410, the side surface in the first direction of the accommodating portion 320, the side surface in the first direction of the adhesive layer 420, the side surface in the first direction of the second electrode 220, and the upper surface and the side surface in the first direction of the second substrate 120.

[0119] In addition, reference Figure 7 , the first sealing portion 510 and the second sealing portion 520 may be partially provided on both side surfaces of the light conversion unit 300 extending in the first direction. That is, the first sealing portion 510 and the second sealing portion 520 may be provided to partially cover the partition 310 provided at both ends of the two side surfaces of the light conversion unit 300 extending in the first direction. That is, the lengths of the first sealing portion 510 and the second sealing portion 520 extending in the first direction may be respectively smaller than the lengths of the two side surfaces of the light conversion unit 300 extending in the first direction.

[0120] Therefore, a region where the sealing portion 500 is provided and a region where the sealing portion 500 is not provided may be defined in the first substrate 110 and the second substrate 120 .

[0121] In detail, the first region and the second region can be respectively defined in the lower portion of the first substrate 110 and the upper portion of the second substrate 120, and the first sealing portion 510 and the second sealing portion 520 are set in the first region, and the first sealing portion 510 and the second sealing portion 520 are not set in the second region and the lower portion of the first substrate 110 or the upper portion of the second substrate 120 is exposed.

[0122] In this case, the size of the first region may be larger than that of the second region. Specifically, the area of ​​the first region may be 10% or less of the total area of ​​the first substrate 110 or the second substrate 120.

[0123] In detail, the area of ​​the first region may be 1% to 10% of the total area of ​​the first substrate 110 or the second substrate 120. In more detail, the area of ​​the first region may be 3% to 7% of the total area of ​​the first substrate 110 or the second substrate 120.

[0124] When the area of ​​the first region exceeds 10% of the total area of ​​the first substrate 110 or the second substrate 120, the light transmittance of light transmitted through or incident toward / into the first substrate 110 or the second substrate 120 may be reduced due to the sealing portion, thereby reducing the overall brightness of the light path control component.

[0125] In addition, when the area of ​​the first region is less than 1% of the total area of ​​the first substrate 110 or the second substrate 120, the area of ​​the sealing portion in contact with the first substrate 110 or the second substrate 120 is reduced, so the adhesion of the sealing portion may deteriorate and the sealing portion may be removed, thereby reducing the reliability of the optical path control component.

[0126] refer to Figure 8 and Figure 9The sealing portion 500 may be provided to have a length greater than the length of both side surfaces of the light conversion unit 300 extending in the first direction. That is, the sealing portion 500 may be provided to completely cover both side surfaces of the light conversion unit 300 extending in the first direction.

[0127] For details, refer to Figure 8 and Figure 9 The first sealing portion 510 and the second sealing portion 520 can be configured to partially surround the outer peripheral surface of the light path control component while extending to the following surfaces, wherein the surfaces are the lower surface and the side surface extending in the first direction of the first substrate 110, the side surface extending in the first direction of the first electrode 210, the side surface extending in the first direction of the buffer layer 410, the side surface of the accommodating portion 320 extending in the first direction, the side surface of the adhesive layer 420 extending in the first direction, the side surface of the second electrode 220 extending in the first direction, and the upper surface and the side surface extending in the first direction of the second substrate 120.

[0128] In addition, reference Figure 10 The sealing portion 500 may be provided to surround the side surface of the light path control member extending in the first direction 1A and the side surface of the light path control member extending in the second direction 2A.

[0129] Therefore, at least one of the side surfaces of the light conversion unit 300 in the second direction may also be completely surrounded by the sealing portion 500 .

[0130] Therefore, in the light path control member according to the embodiment, the outer side surface of the light conversion unit 300 can be completely sealed by the sealing portion 500. That is, impurities such as moisture and air that may penetrate into the receiving portion from the side surface in the second direction of the light conversion unit 300 can be prevented from penetrating.

[0131] That is, in the manufacturing process of the optical path control component, the thickness of the side surfaces of the light conversion unit 300 in the second direction may be different from each other due to tolerance, and the width of any one of the side surfaces in the second direction is formed to be smaller, so that impurities that may penetrate into the receiving portion can penetrate into the receiving portion through the partition portion.

[0132] In the light path control member according to the embodiment, by providing the sealing portion on the side surface of the light conversion unit in the second direction, it is possible to effectively prevent the penetration of foreign matter according to the size of the partition.

[0133] At the same time, although Figures 5 to 10 , it is shown that the sealing portion is provided on the outer surface of the light path member, but the embodiment is not limited thereto, and the sealing portion may be provided on the upper surface of the light conversion unit 300 .

[0134] For example, the light conversion unit 300 may include a receiving portion area that is not filled with the dispersion liquid, the sealing portion may fill the receiving portion area on the light conversion unit 300 that is not filled with the dispersion liquid, and the sealing portion may be configured to partially cover the adhesive layer 420, the second electrode 220, the side surface of the second substrate 120 in the first direction, and the upper surface of the second substrate 120.

[0135] That is, when a plurality of light path control members are manufactured by cutting a large area light path control member, as shown in FIG. Figures 5 to 7 As shown, a sealing portion may be formed, and when a small-area light path control member is manufactured, the sealing portion may be provided on the light conversion unit 300 while filling a receiving portion region not filled with the dispersion.

[0136] refer to Figure 11 and Figure 12 , the light conversion unit 300 may include a partition portion 310 and a receiving portion 320 .

[0137] The partition 310 can be defined as a partition wall unit that divides the receiving section. Specifically, the partition 310 can function as a partition region that separates multiple receiving sections and transmits light. Alternatively, the receiving section 320 can be defined as a variable region that switches between a light-shielding section and a light-transmitting section depending on the application of a voltage.

[0138] The partitions 310 and the receiving portions 320 may be arranged alternately with each other. The partitions 310 and the receiving portions 320 may be arranged to have different widths. For example, the width of the partitions 310 may be greater than the width of the receiving portions 320.

[0139] The partitions 310 and the receiving portions 320 may be arranged alternately with each other. Specifically, the partitions 310 and the receiving portions 320 may be arranged alternately with each other. That is, each partition 310 may be arranged between adjacent receiving portions 320, and each receiving portion 320 may be arranged between adjacent partitions 310.

[0140] The partition 310 may include a transparent material. The partition 310 may include a material capable of transmitting light.

[0141] The partition 310 may include a resin material. For example, the partition 310 may include a photocurable resin material. As an example, the partition 310 may include a UV resin or a transparent photoresist resin. Alternatively, the partition 310 may include a polyurethane resin or an acrylic resin.

[0142] The partition 310 may allow light incident on any one of the first substrate 110 and the second substrate 120 to be transmitted toward the other substrate.

[0143] For example, in Figure 11 and Figure 12In the embodiment, light may be emitted from the first substrate 110 by a light source disposed below the first substrate 110, and the light may be incident toward the second substrate 120. In this case, the partition 310 may transmit light, and the transmitted light may move toward the second substrate 120.

[0144] The receiving portion 320 may include a dispersion 320a and light conversion particles 320b. Specifically, the receiving portion 320 may be filled by injecting the dispersion 320a. A plurality of light conversion particles 320b may be dispersed in the dispersion 320a.

[0145] Dispersion liquid 320a may be a material used to disperse light-converting particles 320b. Dispersion liquid 320a may include a transparent material. Dispersion liquid 320a may include a non-polar solvent. In addition, dispersion liquid 320a may include a material capable of transmitting light. For example, dispersion liquid 320a may include at least one of a halocarbon oil, a paraffin oil, and isopropyl alcohol.

[0146] 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.

[0147] The light-converting particles 320b may include a material capable of absorbing light. That is, the light-converting particles 320b may be light-absorbing particles. The light-converting particles 320b may have a color. For example, the light-converting particles 320b may have a black-based color. As an example, the light-converting particles 320b may include carbon black.

[0148] The photoconversion particles 320b may have polarity due to their surface charge. For example, the surface of the photoconversion particles 320b may be negatively (-) charged. Therefore, depending on the application of voltage, the photoconversion particles 320b may move toward the first electrode 210 or the second electrode 220.

[0149] The light-conversion particles 320b can change the light transmittance of the container 320. Specifically, by changing the light transmittance due to the movement of the light-conversion particles 320b, the container 320 can switch between a light-shielding portion and a light-transmitting portion. In other words, the light transmittance of the light passing through the container 320 can be changed by the dispersion and aggregation of the light-conversion particles 320b disposed in the dispersion 320a.

[0150] 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 voltages applied to the first and second electrodes 210 and 220 .

[0151] Specifically, in the light path control member according to the embodiment, in the first mode, the housing portion 320 can become a light shielding portion, and light at a specific angle can be blocked by the housing 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.

[0152] 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 portion 310 and the housing portion 320. That is, the user's viewing angle from the outside is widened, making it possible to drive the light path control member in the public mode.

[0153] Switching from the first mode to the second mode, i.e., converting the housing 320 from a light-shielding portion to a light-transmitting portion, can be achieved by moving the light-converting particles 320b in the housing 320. Specifically, the light-converting particles 320b may have a charge on their surface and, depending on the characteristics of the charge, may move toward the first electrode or the second electrode in response to the application of a voltage. Specifically, the light-converting particles 320b may be electrophoretic particles.

[0154] In detail, the receiving portion 320 may be electrically connected to the first electrode 210 and the second electrode 220 .

[0155] In this case, when no voltage is applied externally to the light path control member, the light conversion particles 320b of the housing 320 are uniformly dispersed in the dispersion 320a, and the housing 320 can block light through the light conversion particles 320b. Therefore, in the first mode, the housing 320 can be driven as a light shielding portion.

[0156] Alternatively, when a voltage is applied to the light path control member from the outside, the light conversion particles 320b can move. For example, the light conversion particles 320b can be moved toward one end or the other end of the housing 320 by the voltage transmitted through the first electrode 210 and the second electrode 220. In other words, the light conversion particles 320b can move from the housing 320 toward the first electrode 210 or the second electrode 220.

[0157] 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.

[0158] That is, when a voltage is applied to the first electrode 210 and / or the second electrode 220, Figure 11As shown, the light conversion particles 320b can move in the dispersion 320a toward the first electrode 210. That is, the light conversion particles 320b can move in one direction, and the receiving portion 320 can be driven as a light transmitting portion.

[0159] Alternatively, when no voltage is applied to the first electrode 210 and / or the second electrode 220, as shown in FIG. Figure 11 As shown, the light conversion particles 320 b may be uniformly dispersed in the dispersion 320 a to drive the receiving portion 320 into a light shielding portion.

[0160] 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 needs to transmit light only at a specific viewing angle, the receiving portion is driven as a light shielding portion, or when the user needs high brightness in an environment, a voltage can be applied to drive the receiving portion as a light transmitting portion.

[0161] Therefore, since the light path control member according to the present 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.

[0162] Meanwhile, the housing portion may be provided in various shapes in consideration of driving characteristics and the like.

[0163] refer to Figure 13 and Figure 14 In a light path control member according to another embodiment, Figure 11 and Figure 12 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 .

[0164] 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 .

[0165] Therefore, the distance between the receiving portion 320 and the first electrode 210 can be reduced, so that the voltage applied from the first electrode 210 can be smoothly transmitted to the receiving portion 320 .

[0166] Therefore, the moving speed of the light conversion particles 320 b in the receiving portion 320 can be increased, thereby improving the driving characteristics of the light path control member.

[0167] In addition, reference Figure 15 and Figure 16 ,and Figure 11 and Figure 12 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.

[0168] For details, refer to Figure 15 and Figure 16 The receiving portion 320 may be provided 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.

[0169] Therefore, when the light path member is used together with the display panel, moiré 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.

[0170] Meanwhile, the light path control member according to the embodiment may control the magnitude and time of the applied voltage to improve the movement characteristics of the light conversion particles.

[0171] Hereinafter, the magnitude and time of the voltage applied to the light path control member capable of improving the movement characteristics of the light conversion particles will be described in detail.

[0172] When the light path control component according to the embodiment is converted to the first mode (privacy mode), the second mode (public mode) and the first mode (privacy mode), the characteristics of the applied voltage are changed differently, so that when the mode is changed from the second mode to the first mode, the light-shielding property of the light path control component can be improved, and the driving speed of the light path control component can be increased.

[0173] The light path control member in the state where no voltage is applied maintains the first mode. Subsequently, when a first voltage having a positive voltage is applied to the first electrode 210 or the second electrode 220, the light conversion particles 320b move, so that the light path control member can change to the second mode. In the following description, for ease of explanation, the case where the first voltage is applied to the first electrode 210 will be mainly described.

[0174] In detail, when a first voltage having a positive voltage is applied to the first electrode 210, the light conversion particles 320b having a negative charge may move toward the first electrode 210 and may be gathered from the receiving portion 320 toward the first electrode 210. Therefore, the light path control member may be switched from the first mode to the second mode.

[0175] Subsequently, when a second voltage having a negative voltage is applied to the first electrode 210, the negatively charged light conversion particles 320b can move in the opposite direction of the first electrode 210 within the housing 320 and can be dispersed again in the dispersion 320a. Therefore, the light path control member can be changed from the first mode to the second mode.

[0176] The light path control member according to the embodiment is intended to provide a driving method capable of uniformly dispersing the light conversion particles 320b in the dispersion liquid 320a when switching from the second mode (public mode) to the first mode (privacy mode).

[0177] First, a driving method of the light path control member according to the first embodiment will be described.

[0178] According to the light path control member of the first embodiment, when switching from the second mode (public mode) to the first mode (privacy mode), the second voltage having a negative voltage and the third voltage having a pulse voltage can be applied together. In detail, the second voltage can be applied first, and then the third voltage can be applied.

[0179] The second voltage may cause the photoconversion particles 320 b to move. Specifically, the photoconversion particles 320 b may move away from the first electrode 210 according to the application of the second voltage.

[0180] The magnitude of the second voltage may be the same as or similar to the magnitude of the first voltage.Here, the magnitude of the first voltage and the magnitude of the second voltage may be defined as the magnitude of the absolute value of the voltage.

[0181] In detail, the magnitude of the second voltage may be 50% to 150% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may be 70% to 130% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may be 80% to 120% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may be 90% to 110% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may be 95% to 105% of the magnitude of the first voltage. In more detail, the magnitude of the second voltage may be 99% to 101% of the magnitude of the first voltage.

[0182] For example, the second voltage may have a magnitude of approximately +35V to -45V.

[0183] The third voltage may have a pulse voltage that repeats positive and negative voltages. The third voltage may disperse the photoconversion particles 320b. Specifically, upon application of the third voltage, the photoconversion particles 320b may be uniformly dispersed in the dispersion 320a while repeatedly moving toward the first electrode 210 and the second electrode 220 within the dispersion 320a.

[0184] The magnitude of the positive voltage and the negative voltage in the third voltage may be the same as or similar to the magnitude of the first voltage. Here, the magnitude of the positive voltage and the negative voltage in the third voltage may be defined as the magnitude of the absolute value of the voltage.

[0185] In addition, the magnitudes of the positive voltage and the negative voltage of the third voltage may be the same as or different from each other.

[0186] In detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 25% to 150% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 50% to 130% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 80% to 120% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 90% to 110% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 95% to 105% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 99% to 101% of the magnitude of the first voltage.

[0187] For example, when the first voltage has a magnitude of +35V to +45V, the positive voltage of the third voltage may have a magnitude of +10V to +65V, and the negative voltage may have a magnitude of -10V to -65V.

[0188] Furthermore, a difference in magnitude between the negative voltage and the positive voltage of the third voltage may be the same as or similar to a difference in magnitude between the first voltage and the second voltage.

[0189] In detail, the difference between the negative and positive voltages of the third voltage may be 50% to 150% of the difference between the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 70% to 130% of the difference between the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 80% to 120% of the difference between the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 90% to 110% of the difference between the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 95% to 105% of the difference between the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 99% to 101% of the difference between the first and second voltages.

[0190] The third voltage may be repeated in a cycle of a negative voltage and a positive voltage a predetermined number of times. For example, in the third voltage, the negative voltage and the positive voltage may be repeated in a cycle of about 10 to 15 times.

[0191] Each of the second voltage and the third voltage may be applied for a constant time. Specifically, the total application time, which is the sum of the application time of the second voltage and the application time of the third voltage, may be 3 seconds or less. When the sum of the application time of the second voltage and the application time of the third voltage exceeds 3 seconds, the time it takes for the light path control member to switch from the second mode to the first mode increases, and thus the overall driving speed of the light path control member may decrease.

[0192] For example, the application time of the second voltage and the application time of the third voltage may be applied so that the total application time is the same as each other within a range of 3 seconds, or the application time of any voltage is greater. Preferably, the application time of the third voltage for dispersing the light-converting particles may be greater than the application time of the second voltage.

[0193] Figures 17 to 20 is a view for describing the movement of light conversion particles according to application of voltage according to the first embodiment.

[0194] refer to Figure 17 , when the first voltage is applied, the photoconversion particles 320 b may move toward the first electrode 210 .

[0195] Then, refer to Figure 18 When the second voltage is applied, the photoconversion particles 320b may move in the opposite direction of the first electrode 210 as indicated by the arrow. That is, the photoconversion particles 320b may move toward the second electrode 220.

[0196] Then, refer to Figure 19 When the third voltage is applied, the light conversion particles 320 b may be dispersed in the dispersion 320 a while repeatedly moving toward the first electrode 210 and the second electrode 220 as indicated by arrow directions.

[0197] Then, refer to Figure 20 , when 0 V as a break of the pulse voltage is applied, the light conversion particles 320 b may be uniformly dispersed in the dispersion 320 a.

[0198] Hereinafter, a driving method of the light path control member according to the second embodiment will be described.

[0199] According to the light path control member of the second embodiment, when switching from the second mode (public mode) to the first mode (privacy mode), the second voltage having a negative voltage and the third voltage having a pulse voltage can be applied together. In detail, the second voltage can be applied first, and then the third voltage can be applied.

[0200] The driving method of the light path control member according to the second embodiment may be the same as the driving method of the light path control member according to the first embodiment except that the driving method of the third voltage is different.

[0201] In the driving method of the light path control member according to the second embodiment, application times of the positive voltage and the negative voltage in the third voltage having the pulse voltage may be different from each other.

[0202] Specifically, in the second embodiment, the application time of the negative voltage of the third voltage may be greater than the application time of the positive voltage.

[0203] For example, the ratio of the application time of the negative voltage of the third voltage to the application time of the positive voltage may be greater than 1:1 to 9:1. Specifically, the ratio of the application time of the negative voltage of the third voltage to the application time of the positive voltage may be greater than 1:1 to 7:1. In more detail, the ratio of the application time of the negative voltage of the third voltage to the application time of the positive voltage may be greater than 1:1 to 5:1. In more detail, the ratio of the application time of the negative voltage of the third voltage to the application time of the positive voltage may be greater than 1:1 to 3:1.

[0204] By varying the application time of the negative third voltage from the positive third voltage, the photoconversion particles can be uniformly dispersed in various environments. Specifically, when the magnitude of the second voltage applied to cause the photoconversion particles to move is smaller than desired, or the second voltage is applied for a shorter time than desired, the photoconversion particles can be uniformly dispersed in the dispersion by making the negative third voltage longer than the positive third voltage.

[0205] Hereinafter, a driving method of the light path control member according to the third embodiment will be described.

[0206] When the light path control member according to the third embodiment switches from the second mode (public mode) to the first mode (privacy mode), the second voltage having a pulse voltage and the third voltage having a pulse voltage can be applied together. Specifically, the second voltage can be applied first, and then the third voltage can be applied. That is, in the light path control member according to the third embodiment, unlike the first and second embodiments described above, the second voltage can also have a pulse voltage.

[0207] The second voltage may have a pulse voltage that repeatedly includes positive and negative voltages. The second voltage may move and disperse the photoconversion particles 320b. Specifically, the photoconversion particles 320b may move toward the first electrode 210 within the dispersion 320a in response to the application of the negative voltage of the second voltage. The photoconversion particles 320b may be uniformly dispersed in the dispersion 320a while repeatedly moving toward the first electrode 210 and the second electrode 220 in response to the application of the negative and positive voltages of the second voltage.

[0208] That is, the second voltage may be a pulse voltage in which a negative voltage is first applied and then a positive voltage and a negative voltage are repeated.

[0209] The magnitude of the positive and negative voltages in the second voltage may be the same as or similar to the magnitude of the first voltage. In addition, the magnitude of the initial negative voltage of the second voltage may be the same as or similar to the magnitude of the positive voltage of the first voltage. Here, the magnitude of the positive and negative voltages in the second voltage may be defined as the magnitude of the absolute value of the voltage.

[0210] In addition, the magnitudes of the positive voltage and the negative voltage of the second voltage may be the same as or different from each other.

[0211] In detail, the magnitude of the positive voltage and the negative voltage of the second voltage may have a magnitude of 25% to 150% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the second voltage may have a magnitude of 50% to 130% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the second voltage may have a magnitude of 80% to 120% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the second voltage may have a magnitude of 90% to 110% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the second voltage may have a magnitude of 95% to 105% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the second voltage may have a magnitude of 99% to 101% of the magnitude of the first voltage.

[0212] For example, when the first voltage is between +35V and +45V, the positive voltage of the second voltage may be between +10V and +65V, and the negative voltage of the second voltage may be between -10V and -65V.

[0213] Furthermore, a difference in magnitude between the negative voltage and the positive voltage of the second voltage may be the same as or similar to a difference in magnitude between the initial voltages of the first voltage and the second voltage.

[0214] In detail, the difference between the negative and positive voltages of the second voltage may be 50% to 150% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the second voltage may be 70% to 130% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the second voltage may be 80% to 120% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the second voltage may be 90% to 110% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the second voltage may be 95% to 105% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the second voltage may be 99% to 101% of the difference between the initial voltages of the first and second voltages.

[0215] The second voltage may be repeated in a cycle of a negative voltage and a positive voltage a predetermined number of times. For example, in the second voltage, the negative voltage and the positive voltage may be repeated in a cycle of approximately 3 to 5 times.

[0216] The application time of the negative voltage and the application time of the positive voltage of the second voltage may be different.

[0217] In the second voltage, the application time of the negative voltage may be longer than the application time of the positive voltage.

[0218] For example, the ratio of the application time of the negative voltage of the second voltage to the application time of the positive voltage may be greater than 1:1 to 9:1. Specifically, the ratio of the application time of the negative voltage of the second voltage to the application time of the positive voltage may be greater than 1:1 to 8:1. More specifically, the ratio of the application time of the negative voltage of the second voltage to the application time of the positive voltage may be greater than 1:1 to 7:1.

[0219] The third voltage may have a pulse voltage that repeats positive and negative voltages. The third voltage may disperse the photoconversion particles 320b. Specifically, upon application of the third voltage, the photoconversion particles 320b may be uniformly dispersed in the dispersion 320a while repeatedly moving in the direction of the first electrode 210 and the direction of the second electrode 220 within the dispersion 320a.

[0220] The magnitude of the positive voltage and the negative voltage of the third voltage may be the same as or similar to the magnitude of the first voltage. Here, the magnitude of the positive voltage and the negative voltage of the third voltage may be defined as the magnitude of the absolute value of the voltage.

[0221] In addition, the magnitudes of the positive voltage and the negative voltage of the third voltage may be the same as or different from each other.

[0222] In detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 25% to 150% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 50% to 130% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 80% to 120% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 90% to 110% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 95% to 105% of the magnitude of the first voltage. In more detail, the magnitude of the positive voltage and the negative voltage of the third voltage may be 99% to 101% of the magnitude of the first voltage.

[0223] For example, when the first voltage has a magnitude of +35V to +45V, the positive voltage of the third voltage may have a magnitude of +10V to +65V, and the negative voltage may have a magnitude of -10V to -65V.

[0224] Furthermore, a difference in magnitude between the negative voltage and the positive voltage of the third voltage may be the same as or similar to a difference in magnitude between the initial voltages of the first voltage and the second voltage.

[0225] In detail, the difference between the negative and positive voltages of the third voltage may be 50% to 150% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 70% to 130% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 80% to 120% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 90% to 110% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 95% to 105% of the difference between the initial voltages of the first and second voltages. In more detail, the difference between the negative and positive voltages of the third voltage may be 99% to 101% of the difference between the initial voltages of the first and second voltages.

[0226] The third voltage may be repeated in a cycle of a predetermined number of times of a negative voltage and a positive voltage. The number of cycles of the third voltage may be different from the number of cycles of the second voltage. Specifically, the number of cycles of the third voltage may be greater than the number of cycles of the second voltage.

[0227] For example, in the third voltage, the negative voltage and the positive voltage may be repeated in a cycle of about 7 to 13 times.

[0228] Each of the second voltage and the third voltage may be applied for a constant time. Specifically, the total application time, which is the sum of the application time of the second voltage and the application time of the third voltage, may be 3 seconds or less. When the sum of the application time of the second voltage and the application time of the third voltage exceeds 3 seconds, the time it takes for the light path control member to switch from the second mode to the first mode increases, and thus the overall driving speed of the light path control member may decrease.

[0229] For example, within a total application time range of 3 seconds, the application time of the second voltage and the application time of the third voltage may be applied to be equal to each other, or the application time of a specific voltage may be applied to be longer. Preferably, the application time of the third voltage for dispersing the light-converting particles may be longer than the application time of the second voltage.

[0230] Figures 21 to 25 is a view for describing the movement of light conversion particles according to application of voltage according to the third embodiment.

[0231] refer to Figure 21 , when the first voltage is applied, the photoconversion particles 320 b may move toward the first electrode 210 .

[0232] Then, refer to Figure 22 and Figure 23 When the second voltage is applied, the light conversion particles 320b may be as follows Figure 22 The light conversion particles 320b move in the opposite direction to the first electrode 210 as shown in the arrow direction. That is, the light conversion particles 320b can move toward the second electrode 220. Figure 23 , the light conversion particles 320 b may be dispersed in the dispersion liquid 320 a while repeatedly moving toward the first electrode 210 and the second electrode 220 as indicated by arrow directions.

[0233] Then, refer to Figure 24 , when the third voltage is applied, the light conversion particles 320 b may be dispersed in the dispersion liquid 320 a while repeatedly moving toward the first electrode 210 and the second electrode 220 as indicated by arrow directions.

[0234] Then, refer to Figure 25 , when 0 V as a break of the pulse voltage is applied, the light conversion particles 320 b may be uniformly dispersed in the dispersion 320 a.

[0235] Hereinafter, a driving method of the light path control member according to the fourth embodiment will be described.

[0236] When switching from the second mode (public mode) to the first mode (privacy mode), the light path control member according to the fourth embodiment can apply the second voltage having a negative voltage and the third voltage having a pulse voltage together. In detail, the second voltage can be applied first, and then the third voltage can be applied.

[0237] The driving method of the light path control member according to the fourth embodiment may be the same as the driving method of the light path control member according to the third embodiment except that the driving method of the third voltage is different.

[0238] In the driving method of the light path control member according to the fourth embodiment, application times of the positive voltage and the negative voltage of the third voltage having the pulse voltage may be different from each other.

[0239] Specifically, in the fourth embodiment, the application time of the negative voltage of the third voltage may be greater than the application time of the positive voltage.

[0240] For example, the ratio of the application time of the negative voltage of the third voltage to the application time of the positive voltage may be greater than 1:1 to 9:1. Specifically, the ratio of the application time of the negative voltage of the third voltage to the application time of the positive voltage may be greater than 1:1 to 7:1. In more detail, the ratio of the application time of the negative voltage of the third voltage to the application time of the positive voltage may be greater than 1:1 to 5:1. In more detail, the ratio of the application time of the negative voltage of the third voltage to the application time of the positive voltage may be greater than 1:1 to 3:1.

[0241] By varying the application time of the negative third voltage from the positive third voltage, the photoconversion particles can be uniformly dispersed in various environments. Specifically, when the magnitude of the second voltage applied to cause the photoconversion particles to move is smaller than desired, or the second voltage is applied for a shorter time than desired, the photoconversion particles can be uniformly dispersed in the dispersion by varying the application time of the negative third voltage from the positive third voltage.

[0242] The light path control member according to the embodiment can improve the dispersibility of the light conversion particles when switching from the second mode (public mode) to the first mode (privacy mode), thereby improving the shielding characteristics in the first mode.

[0243] That is, since the step of dispersing the light conversion particles by applying a pulse voltage is included, the light conversion particles are more uniformly dispersed in the dispersion in the second mode, so that the light transmittance of the light path control member in the first mode can be reduced.

[0244] Therefore, the driving characteristics and driving speed of the light path control member can be improved.

[0245] Hereinafter, the present invention will be described in more detail by measuring the light transmittance of the light path control member according to the embodiment and the comparative example. These embodiments are presented only as examples to describe the present invention in more detail. Therefore, the present invention is not limited to these embodiments.

[0246] At the same time, the light transmittance of the following optical path control component can be defined as the light transmittance measured as follows: after measuring the brightness A of light emitted from the light source in a state where the optical path control component is not set and the brightness B of light emitted from the light source through the optical path control component at an angle of 45° in a state where the optical path control component is set on the light source, the light transmittance is measured by (B / A)*100.

[0247] In addition, the pulse voltage applied to the optical path control member described below can be measured by checking the on / off voltage of an oscilloscope device. That is, the voltage application pattern of the two electrodes is measured by connecting voltage measurement terminals to the two electrodes using an oscilloscope device.

[0248] Example 1

[0249] The first light transmittance in the initial mode where no voltage is applied is measured.

[0250] Subsequently, a voltage of +40 V is applied to the light path control member in the initial mode in which no voltage is applied, to switch the light path control member to the public mode.

[0251] Then, a voltage of -40V was applied for 1.4 seconds, a pulse voltage having negative and positive voltages of -20V and +10V was repeated 13 cycles in 1.6 seconds, and then the voltage was adjusted to 0V to switch the light path control member to the privacy mode.

[0252] When the light path control member is completely switched to the privacy mode, no separate voltage is applied to the light path control member.

[0253] Then, the second light transmittance in the privacy mode is measured.

[0254] Then, the difference between the second light transmittance and the first light transmittance is measured.

[0255] Example 2

[0256] The difference between the second light transmittance and the first light transmittance is measured in the same manner as in Example 1, except that a pulse voltage having negative and positive voltages of -20 V and +20 V is repeated 13 cycles in 1.6 seconds and then the voltage is adjusted to 0 V to convert the light path control member into the privacy mode.

[0257] Example 3

[0258] The difference between the second light transmittance and the first light transmittance is measured in the same manner as in Example 1, except that a voltage of -40 V is applied for 1.6 seconds, a pulse voltage having negative voltages and positive voltages of -20 V and +20 V is repeated for 12 cycles in 1.4 seconds, and then the voltage is adjusted to 0 V to convert the light path control member into a privacy mode.

[0259] Example 4

[0260] The difference between the second light transmittance and the first light transmittance is measured in the same manner as in Example 1, except that a voltage of -40 V is applied for 1.6 seconds, a pulse voltage having negative and positive voltages of -40 V and +40 V is repeated for 12 cycles in 1.4 seconds, and then the voltage is adjusted to 0 V to convert the light path control member into a privacy mode.

[0261] Example 5

[0262] The first light transmittance in the initial mode where no voltage is applied is measured.

[0263] Then, pulse voltages having negative and positive voltages of -40 V and +40 V were applied to the light path control member in the initial mode to which no voltage was applied.

[0264] In this case, the ratio of the application time of the negative voltage of -40 V to the application time of the positive voltage of +40 V was set to 7:1, and the pulse voltage was repeated for 4 cycles.

[0265] The pulse voltage having negative and positive voltages of -40 V and +40 V was repeated for 9 cycles at 1.1 seconds, and then the voltage was adjusted to 0 V to convert the light path control member into the privacy mode.

[0266] Then, the second light transmittance in the privacy mode is measured.

[0267] Then, the difference between the second light transmittance and the first light transmittance is measured.

[0268] Example 6

[0269] The difference between the second light transmittance and the first light transmittance is measured in the same manner as in Example 5, except that the ratio of the application time of the negative voltage of -40 V to the application time of the positive voltage of +40 V is set to 8:1, the pulse voltage is repeated for 3 cycles, the pulse voltage with negative voltages and positive voltages of -40 V and +40 V is repeated for 9 cycles in 1.6 seconds, and then the voltage is adjusted to 0 V to convert the light path control member into the privacy mode.

[0270] Example 7

[0271] The difference between the second light transmittance and the first light transmittance is measured in the same manner as in Example 5, except that the ratio of the application time of the negative voltage of -40 V to the application time of the positive voltage of +40 V is set to 9:1, the pulse voltage is repeated for 3 cycles, the pulse voltage having negative and positive voltages of -40 V and +40 V is repeated for 10 cycles in 1.4 seconds, and then the voltage is adjusted to 0 V to convert the optical path control member into the privacy mode.

[0272] Comparative Example 1

[0273] The first light transmittance in the initial mode where no voltage is applied is measured.

[0274] Subsequently, a voltage of +40 V was applied to the light path control member in the initial mode to which no voltage was applied, to switch the light path control member to the public mode.

[0275] Then, a voltage of -40 V was applied for 1.5 seconds to switch the light path control member to the privacy mode.

[0276] Then, the second light transmittance in the privacy mode is measured.

[0277] Then, the difference between the second light transmittance and the first light transmittance is measured.

[0278] Comparative Example 2

[0279] The difference between the second light transmittance and the first light transmittance was measured in the same manner as in Comparative Example 1, except that the light path control member was switched to the privacy mode by applying a voltage of −40 V for 1.6 seconds.

[0280] [Table 1]

[0281] Light transmittance (%) Example 1 1.9 Example 2 1.9 Example 3 1.4 Example 4 1.4 Example 5 1.7 Example 6 0.93 Example 7 0.97 Comparative Example 1 4.61 Comparative Example 2 4.30

[0282] Figures 26 to 34 : are views showing voltage changes and flows of pulse voltages according to the embodiment and the comparative example.

[0283] Specifically, Figure 26 This is a view of Example 1, Figure 27 This is a view of Example 2, Figure 28 This is a view of Example 3, Figure 29 This is a view of Example 4, Figure 30 This is a view of Example 5, Figure 31 This is a view of Example 6, Figure 32 This is a view of Example 7, Figure 33 is a view of Comparative Example 1, Figure 34 is a view of Comparative Example 2. Figures 26 to 34In the figure, the X-axis represents time (seconds) and the Y-axis represents voltage (V).

[0284] Referring to Table 1, it can be seen that the difference between the second light transmittance and the first light transmittance of the light path control member according to the embodiment is smaller than the difference between the second light transmittance and the first light transmittance of the light path control member according to the comparative example. In other words, it can be seen that in the light path control member according to the embodiment, the light transmittance in the privacy mode is substantially similar to the light transmittance in the initial mode.

[0285] That is, in the light path control member according to the embodiment, when switching from the public mode to the private mode by appropriately using a pulse voltage, dispersion of the light conversion particles becomes uniform in about 3 seconds, so that light transmittance in the private mode may be reduced.

[0286] That is, the light path control member according to the embodiment may control the difference in light transmittance between the privacy mode and the initial mode to 4% or less, specifically 3% or less, more specifically 2% or less, more specifically 1% or less.

[0287] In other words, the difference between the light transmittance in the initial mode and the light transmittance when converted to the privacy mode after converting to the public mode can be controlled to 4% or less, specifically, 3% or less, more specifically, 2% or less, and even more specifically, 1% or less.

[0288] That is, the light path controlling member according to the embodiment can improve the driving speed and driving characteristics of the light path controlling member by using the pulse voltage.

[0289] Below, we will refer to Figures 35 to 39 A display device and a display apparatus to which the light path control member according to the embodiment is applied are described.

[0290] refer to Figure 35 and Figure 36 , the light path controlling member 1000 according to the embodiment may be disposed above or below the display panel 2000 .

[0291] The display panel 2000 and the light path control member 1000 may be arranged to be adhered to each other. For example, the display panel 2000 and the light path control member 1000 may be adhered to each other by an adhesive member 1500. The adhesive member 1500 may be transparent. For example, the adhesive member 1500 may include an adhesive or adhesive layer containing an optically transparent adhesive material.

[0292] The adhesive member 1500 may include a release film. In detail, when the light path control member and the display panel are attached, the light path control member and the display panel may be attached after removing the release film.

[0293] At the same time, reference Figure 35 and Figure 36 , one end of the light path control member 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 area is an electrode connection portion where the first electrode 210 and the second electrode 220 are exposed, and an external printed circuit board and the light path control member can be connected through the electrode connection portion.

[0294] The display panel 2000 may include a first 'substrate 2100 and a second 'substrate 2200. When the display panel 2000 is a liquid crystal display panel, the light path control member may be formed below the liquid crystal panel. That is, when the surface of the liquid crystal panel viewed by the user is defined as the upper portion 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 into a structure in which the first 'substrate 2100 including thin film transistors (TFTs) and pixel electrodes and the second 'substrate 2200 including a color filter layer are bonded to each other with a liquid crystal layer interposed therebetween.

[0295] In addition, the display panel 2000 can be a liquid crystal display panel with a color filter on transistor (COT) structure. In the color filter on transistor (COT) structure, a thin film transistor, a color filter and a black electrolyte are formed on 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 can be formed on the first 'substrate 2100, a protective film can be formed on the thin film transistor, and a color filter layer can be formed on the protective film. In addition, a pixel electrode in contact with the thin film transistor can be formed on the first 'substrate 2100. In this regard, in order to increase the aperture ratio and simplify the mask process, the black electrolyte can be omitted, and the common electrode can function as the black electrolyte.

[0296] 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 .

[0297] That is, Figure 35 As shown, the light path control member may be disposed below the liquid crystal panel and above the backlight unit 3000 , and the light path control member may be disposed between the backlight unit 3000 and the display panel 2000 .

[0298] Or, as Figure 36As 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 be further included on the organic light emitting element.

[0299] 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 .

[0300] Furthermore, although not shown in the figures, 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 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 diode panel, the polarizing plate may be a polarizing plate that prevents external light reflection.

[0301] In addition, an additional functional layer 1300, such as an anti-reflection layer or an anti-glare layer, may be further provided on the light path control member 1000. Specifically, the functional layer 1300 may be adhered to one surface of the first substrate 110 of the light path control member. Although not shown in the figure, the functional layer 1300 may be adhered to the first substrate 110 of the light path control member via an adhesive layer. In addition, a release film may be provided on the functional layer 1300 to protect the functional layer.

[0302] In addition, a touch panel may be provided between the display panel and the light path control member.

[0303] Although the figure shows that the light path control member is set at the upper part of the display panel, this embodiment is not limited to this. The light path control member can be set at various positions such as the position where the light can be adjusted, that is, the lower part of the display panel, or between the second substrate and the first substrate of the display panel, etc.

[0304] In addition, while the light conversion unit of the optical path control member according to the embodiment is shown in the drawings as being parallel or perpendicular to the outer surface of the second substrate, the light conversion unit is formed to be inclined at a specified angle from the outer surface of the second substrate. This can reduce the moiré phenomenon that occurs between the display panel and the optical path control member.

[0305] refer to Figures 37 to 39 , the light path controlling member according to the embodiment can be applied to various display devices.

[0306] refer to Figures 37 to 39 , the light path control member according to the embodiment can be applied to a display device that enables a display to be displayed.

[0307] For example, Figure 37 As shown, when the light path control member is energized, the housing portion functions as a light transmitting portion, thereby driving the display device in a public mode, and as shown in FIG. Figure 38 As shown, when the light path control member is not energized, the housing portion functions as a light shielding portion, so that the display device can be driven in a light shielding mode.

[0308] Therefore, the user can easily drive the display device in the privacy mode or the normal mode according to the application of power.

[0309] The light emitted from the backlight unit or the self-luminous element may move from the first substrate to the second substrate. Alternatively, the light emitted from the backlight unit or the self-luminous element may also move from the second substrate to the first substrate.

[0310] In addition, reference Figure 39 , a display device to which the light path control member according to the embodiment is applied can also be applied inside a vehicle.

[0311] For example, a display device including the light path control member according to the embodiment can display video confirmation information of the vehicle and a moving path of the vehicle.The display device can be provided between a driver's seat and a passenger seat of the vehicle.

[0312] Furthermore, the light path control member according to the embodiment may be applied to an instrument panel that displays vehicle speed, engine and warning signals, and the like.

[0313] 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.

[0314] 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.

[0315] In addition, the above mainly describes the embodiments, but these embodiments are merely examples and do not limit the present invention. Those skilled in the art will understand that various changes and applications not described above can be made without departing from the basic features of the embodiments. For example, each component specifically shown in the embodiments can be changed. In addition, it should be understood that differences related to such changes and such applications are included in the scope of the present invention as 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 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 a light conversion unit, the light conversion unit being disposed between the first electrode and the second electrode, The light conversion unit includes alternately arranged partitions and receiving portions. The receiving portion includes a dispersion liquid and light conversion particles dispersed in the dispersion liquid. The receiving portion is driven in a public mode and a private mode depending on whether a voltage is applied. When the housing portion is switched from the private mode to the public mode, a first voltage is applied. When the housing portion is switched from the public mode to the private mode, a second voltage and a third voltage are applied, and wherein the second voltage has a pulse voltage in which a negative voltage and a positive voltage are continuously repeated, and the third voltage has a pulse voltage in which a negative voltage and a positive voltage are continuously repeated after the second voltage is applied, wherein the application time of the negative voltage in the pulse voltage of each of the second voltage and the third voltage is longer than the application time of the positive voltage in the pulse voltage of each of the second voltage and the third voltage, wherein the absolute values ​​of the first voltage, the positive voltage of the second voltage, the negative voltage of the second voltage, the positive voltage of the third voltage, and the negative voltage of the third voltage are equal, and The ratio of the application time of the negative voltage of the second voltage to the application time of the positive voltage of the second voltage is greater than 8:1 and less than 9:

1.

2. The light path control member according to claim 1, wherein The positive voltage of the third voltage and the negative voltage of the third voltage are repeated for 10 to 15 cycles.

3. The light path control member according to claim 1, wherein The total application time is less than 3 seconds, and the total application time is the sum of the application time of the second voltage and the application time of the third voltage.

4. The light path control member according to claim 1, wherein The pulse voltage of the second voltage is applied first, and then the pulse voltage of the third voltage is applied.

5. The light path control member according to claim 1, wherein The number of cycles of the third voltage is greater than the number of cycles of the second voltage. The light path control member according to claim 1 , wherein: An application time of the negative voltage of the pulse voltage of the second voltage is longer than an application time of the positive voltage of the pulse voltage of the second voltage.

7. A display device comprising: A display panel, the display panel comprising a light source; as well as The light path control member according to claim 1, wherein the light path control member is provided on the display panel.

8. The display device according to claim 7, wherein: The display panel includes a backlight unit and a liquid crystal display panel, The light path control member is disposed between the backlight unit and the liquid crystal display panel, and Light emitted from the backlight unit moves from the second substrate toward the first substrate.

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