KR20150062864A - Complex optical sheet and back light unit comprising the same - Google Patents

Complex optical sheet and back light unit comprising the same Download PDF

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Publication number
KR20150062864A
KR20150062864A KR1020130147953A KR20130147953A KR20150062864A KR 20150062864 A KR20150062864 A KR 20150062864A KR 1020130147953 A KR1020130147953 A KR 1020130147953A KR 20130147953 A KR20130147953 A KR 20130147953A KR 20150062864 A KR20150062864 A KR 20150062864A
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KR
South Korea
Prior art keywords
pattern
prism
optical sheet
adhesive
optical
Prior art date
Application number
KR1020130147953A
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Korean (ko)
Inventor
김진우
강경구
김현영
우제하
Original Assignee
제일모직주식회사
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Priority to KR1020130147953A priority Critical patent/KR20150062864A/en
Publication of KR20150062864A publication Critical patent/KR20150062864A/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors

Abstract

The present invention relates to a complex optical sheet wherein a first optical sheet having a first optical pattern and a second optical sheet having a second optical pattern are integrated by a bonding layer formed on one side of the first optical sheet and by a plurality of bonding rods capable of passing through the bonding layer. The bonding rods are formed in a valley between the adjacent patterns of the second optical pattern. The second optical pattern is separated from the bonding layer. The complex optical sheet of the present invention can minimize brightness degradation according to lamination by using the bonding rods and prevent a wicking phenomenon of the summit of a prism. Moreover, a moire phenomenon can be prevented. The complex optical sheet has excellent brightness uniformity and light efficiency by reducing or removing a side lobe.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a composite optical sheet and a backlight unit including the composite optical sheet.

The present invention relates to a composite optical sheet and a backlight unit including the composite optical sheet.

Liquid crystal displays are one of the most widely used flat panel displays today. The liquid crystal display has a structure in which a liquid crystal layer is sealed between a TFT array substrate and a color filter substrate. An electric field is applied to the electrodes existing on the array substrate and the color filter substrate to change the arrangement of the liquid crystal molecules in the liquid crystal layer sealed therebetween, and the images are displayed using the electric field.

Since the liquid crystal display does not emit light itself, a backlight unit is required. The backlight unit may include a light source such as a light emitting diode or a fluorescent lamp, a light guide plate, a prism sheet, a diffusion sheet, a protective sheet, or the like.

The characteristics required for the liquid crystal display vary depending on the application, but include high brightness, wide viewing angle, energy saving, thin and light weight, and particularly high brightness.

Such a high luminance is a method of increasing the luminance of the light source itself and a method of increasing the utilization of light. The method of increasing the luminance of the light source itself increases the energy consumption, but the method of increasing the utilization of the light can achieve the high brightness without increasing the energy consumption.

In order to achieve high brightness without increasing energy consumption, a condensing sheet may be laminated such as a POP (Prism on Prism) structure, or a diffusion sheet and a condenser sheet may be used in combination as in a MOP (Micro lens on prism) structure .

In addition, in recent years, the thickness of the optical sheet is also minimized due to the slimming of the display panel. Although a plurality of optical sheets are used for this purpose, there is a continuing demand for reduction in luminance, efficient use of a light source, and improvement in brightness due to wicking phenomenon of a laminate or a prism summit.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a composite optical sheet in which luminance degradation is minimized according to a lumber.

Another object of the present invention is to provide a composite optical sheet capable of preventing the wicking phenomenon of the prism.

Another object of the present invention is to provide a composite optical sheet capable of preventing a moire phenomenon.

Another object of the present invention is to provide a composite optical sheet excellent in luminance uniformity and light efficiency by reducing or eliminating side lobes.

One aspect of the present invention is a method of manufacturing an optical element comprising a first optical sheet on which a first optical pattern is formed and a second optical sheet on which a second optical pattern is formed are laminated on an adhesive layer formed on one surface of the first optical sheet and a plurality of adhesive columns And the adhesive pillar is formed in a valley between two adjacent patterns of the second optical pattern, and the second optical pattern is spaced apart from the adhesive layer.

Another aspect of the present invention relates to a backlight unit including the composite optical sheet.

The composite optical sheet of the present invention can minimize the deterioration of the brightness due to the joining by introducing the adhesive pillars, prevent wrinking of the prism, prevent the moire phenomenon, thereby reducing or eliminating side lobes, thereby providing excellent luminance uniformity and light efficiency.

1 shows a perspective view of a composite optical sheet according to one embodiment of the present invention.
Fig. 2 is a cross-sectional view of a composite optical sheet cut along the line a-a 'in Fig. 1;
3 shows a perspective view of a composite optical sheet according to one embodiment of the present invention.
4 is a perspective view of a second optical sheet for explaining the arrangement period of the adhesive pillars according to one embodiment of the present invention.
5 is a perspective view of a backlight unit according to an embodiment of the present invention.

Embodiments of the present application will now be described in more detail with reference to the accompanying drawings. However, the techniques disclosed in the present application are not limited to the embodiments described herein but may be embodied in other forms. It should be understood, however, that the embodiments disclosed herein are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, the width, thickness, and the like of the components are enlarged in order to clearly illustrate the components of each device. In addition, although only a part of the components is shown for convenience of explanation, those skilled in the art will be able to easily grasp the rest of the components. It is to be understood that when an element is described as being located on another element, it is meant that the element is directly on top of the other element or that additional elements can be interposed between the elements . It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. In the drawings, the same reference numerals denote substantially the same elements.

Hereinafter, a composite optical sheet according to one embodiment of the present invention will be described with reference to Figs. 1 to 4. Fig. FIG. 1 is a perspective view of a composite optical sheet according to one embodiment of the present invention, and FIG. 2 is a sectional view taken along line a-a 'of FIG. FIG. 3 is a perspective view of a composite optical sheet according to one embodiment of the present invention, and FIG. 4 is a perspective view of a second optical sheet for explaining an arrangement period of the adhesive pillars according to an embodiment of the present invention will be.

1 and 2, a composite optical sheet 100 according to an embodiment of the present invention includes a first optical sheet 110 and a second optical sheet 120 formed on a lower portion of the first optical sheet 110, And the first optical sheet 110 and the second optical sheet 120 can be integrated by the adhesive layer 130 and the adhesive pillar 150 formed therebetween. The term 'integrated' in this context means that the adhesive pillar 150 extending from the second optical sheet 120 contacts or penetrates the adhesive layer 130 to the adhesive layer 130 formed on the lower portion of the first optical sheet 110, .

 The first optical sheet 110 may include a first base film 111 and a first optical pattern 112 formed on a light exit surface of the first base film 111.

The first optical pattern 112 may be a pattern selected from the group consisting of a microlens pattern, an emboss pattern, a lenticular lens pattern, a prism pattern, a pyramid pattern, a mat pattern, and a mixed pattern thereof. For example, the emboss pattern may be an emboss pattern formed with irregular relief or negative relief, hitting the surface of a bead roll having a diameter of 1 to 200 mu m to form irregularities, and the mat pattern may be a pattern And can be formed by matt-coating, both of which can scatter light and contribute to brightness increase. FIG. 3 is a perspective view illustrating a case where the first optical pattern is a hexagonal micro lens pattern in the composite optical sheet 200 according to one embodiment of the present invention, but the present invention is not limited thereto. The hexagonal microlens may have a pitch of 20 탆 to 100 탆 and a height of 10 탆 to 50 탆. In the above range, light can be condensed from the light source to improve the brightness.

1 and 2, the second optical sheet 120 may include a second optical film 122 formed on the light exit surface of the second base film 121 and the second base film 121 have. 1 and 2 illustrate a case where a prism pattern 122 is formed on a second base film 121 with a second optical pattern 122. However, the second optical pattern 122 is not limited thereto, and may be a micro lens pattern, a hexagonal microlens pattern, an emboss pattern, a lenticular lens pattern, a pyramid pattern, a mixed pattern thereof, or the like.

The prism pattern 122 may be formed as an integral unit with the second base film 121 as an optical member for refracting the light passing through the second base film 121 to have a certain directionality. For example, the second optical sheet 120 can be formed by injecting a photocurable resin composition between a pulling roll having a prism pattern engraved thereon and a base film, curing the film, and separating the pulling roll from the prism pattern. The curing of the photo-curable resin composition can be performed by irradiating ultraviolet light having a wavelength of 190 nm to 450 nm and an energy of 100 to 900 mJ / cm 2 , but is not limited thereto.

The prism pattern 122 is formed by continuously arranging a plurality of prisms having the same height H1 and pitch P on the base film in the same direction. The prism may be a triangular prism whose cross section is a triangle, and the entire shape of the prism is a triangular prism. The prism may have a height H1 of 10 to 50 mu m and a pitch P of 20 to 100 mu m. A summit of the prism may be formed apart from the adhesive layer 130.

The adhesion pillar 150 may be formed on the second optical pattern 122 and extend in the height direction of the prism pattern 122 between two neighboring patterns. FIGS. 1 and 2 illustrate the case where the adhesive pillars 150 are formed on valleys between two neighboring prisms. In the present invention, a valley means a region having the lowest height among concave groove regions formed between neighboring prisms. When the adhesive pillar is formed on the valley between the two prisms as described above, the side lobe phenomenon or the moire phenomenon can be prevented.

The adhesive pillar 150 may penetrate the adhesive layer 130 to integrate the first optical sheet 110 and the second optical sheet 120 together. In the present invention, "penetration" means that the uppermost part of the adhesive pillar penetrates the adhesive layer and enters the adhesive layer.

For example, the ratio (G / T) of the thickness T of the adhesive layer 130 to the penetration length G penetrating the adhesive layer 130 may be 0.05 to 0.7.

The height H2 of the adhesive column exceeds the height H1 of the prism so that the prism can be separated from the adhesive layer. For example, the ratio H2 / H1 of the height H2 of the adhesive column to the height H1 of the prism is 1.1 To 1.4. It is possible to prevent the wicking phenomenon of the prism unit in the above range to prevent the luminance from being lowered and to prevent the luminance loss due to the side lobe phenomenon.

The adhesive pillar 150 may be, for example, a cylinder, an elliptical pillar or a square pillar.

When the adhesive pillar 150 is a cylinder, the cross-section of the cylinder may be a circle. The diameter D of the circle may be 30 to 70 mu m. The ratio D / P of the diameter D of the cylinder 150 to the pitch P of the prism may be 0.1 to 0.8. It is possible to minimize occurrence of side lobe in the above range and to prevent moire phenomenon.

When the adhesive pillar 150 is an elliptic column, the elliptic column is an ellipse having a short axis and a long diameter in a cross section, the short diameter and the long diameter are 30 to 70 占 퐉, and the ratio (b / a) may be from 1: 1.1 to 1: 2. The long diameter of the ellipse and the length direction of the prism are perpendicular, and the length direction of the prism is the same.

When the adhesive pillar 150 is a square pillar, the cross section of the square pillar may be a square having a width c and a length d of 30 to 70 μm, respectively, and the width c and the length d (D / c) may be from 1: 1 to 1: 3. The vertical length of the rectangle and the longitudinal direction of the prism are vertical, and the horizontal length and the length direction of the prism are the same.

The bonding pillar 150 may be formed integrally with the prism pattern 122. For example, a photo-curing resin composition is injected between the stamping roll and the base film in a state in which one side of the base film is in contact with the mold stamping roll in which the prism pattern and the adhesive column pattern are stamped together, The photocurable resin composition coating layer can be formed by separating from the pulling roll.

The adhesive pillars 150 may be arranged with a constant period. 4 is a perspective view of a second optical sheet 120 shown for explaining the arrangement period or arrangement interval of the adhesive pillars 150. The adhesive pillars 150 are cylinders 150, Is an example of the prism pattern 122. Referring to FIG. 4, the adhesive pillars 150 may be arranged with a certain period based on the number n of prisms or the pitch P of prisms constituting the prism pattern. For example, the adhesion pillar 150 may have an arrangement period formed by n prisms in a direction perpendicular to the longitudinal direction of the prism on the prism pattern 122, and the arrangement interval L1 may be nP. The n may be an integer of 4 or more and 9 or less. In addition, two neighboring adhesion pillars formed on the same valley in the longitudinal direction of the prism may be formed with a constant arrangement interval L2. The arrangement interval L2 may be 4P to 20P.

In the present invention, the arrangement interval (L1) and the arrangement interval (L2) mean the minimum distance between the centers of the cross sections of adjacent bonding posts. It is possible to sufficiently secure the adhesive force in the neighboring adhesion range in the above range and to minimize the luminance drop. Fig. 3 shows an example in which the adhesion pillar 150 has an arrangement period in which four prisms are arranged in a direction perpendicular to the longitudinal direction of the prism, and the arrangement interval L1 is 4P.

The thicknesses of the first base film 111 and the second base film 121 are not limited, but may be 50 to 300 占 퐉. The thickness of the adhesive layer 130 may be 1 to 30 占 퐉, for example, 1 to 10 占 퐉.

The first base film 111 and the second base film 121 may be formed of the same material or different materials. For example, the first base film 111 and the second base film 121 may be formed of a resin such as polyethylene terephthalate (PET), polycarbonate (PC) resin, triacetyl cellulose (TAC) (PS) resin such as polyethylene terephthalate (PET) resin, cellulose resin, polymethyl methacrylate (PMMA) resin, and polystyrene (PS)

The prism pattern 122 and the optical pattern 112 may be made of an ultraviolet curable resin composition. The ultraviolet-curable resin composition may include an ultraviolet curable compound and a photoinitiator.

The ultraviolet curable compound is a compound having an acrylate functional group, and examples thereof include ethylene glycol diacrylate, neopentyl glycol di (meth) acrylate, 1,6-hexanediol (meth) acrylate, Di (meth) acrylate of dipentaerythritol hexa (meth) acrylate, polyol poly (meth) acrylate, bisphenol A-diglycidyl ether, polyhydric alcohol and polyhydric carboxylic acid and anhydride thereof (Meth) acrylate, polysiloxane polyacrylate, urethane (meth) acrylate, pentaerythritol tetramethacrylate, glycerin trimethacrylate and urethane acrylate, which can be obtained by esterifying acrylic acid and acrylic acid , But is not limited thereto. The ultraviolet curing compound having an acrylate-based functional group may include an acrylate compound having a hydroxy group. Such an acrylate compound having a hydroxy group may be selected from oligomers such as 2-hydroxyethyl acrylate oligomer, 2-hydroxypropyl acrylate oligomer and pentaerythritol triacrylate oligomer, 2-hydroxyethyl (meth) acrylate, 2- Monomers such as hydroxypropyl (meth) acrylate, caprolactone (meth) acrylate, 2,3-dihydroxypropyl (meth) acrylate and 4-hydroxymethylcyclohexyl (meth) acrylate can be used . The ultraviolet curable compound may be a fluorine-containing compound such as a fluorine-containing epoxy acrylate or a fluorine-containing alkoxysilane. Specific examples thereof include 3-perfluorooctyl-2-hydroxypropyl (meth) acrylate, 3- (perfluoro-9-methyldecyl) -1 , 2-epoxypropane, (meth) acrylic acid-2,2,2-trifluoroethyl, (meth) acrylic acid-2,2,2-trifluoromethyl, 3,3,3- But are not limited thereto.

The photoinitiator may be a conventionally known photoinitiator. For example, benzophenone compounds such as 1-hydroxycyclohexyl phenyl ketone can be used, but are not limited thereto.

The ultraviolet ray curable resin composition may contain at least one member selected from the group consisting of a photosensitizer, a photosensitizer, a polymerization inhibitor, a leveling agent, a wettability improver, a surfactant, a plasticizer, an ultraviolet absorber, an antioxidant, an antistatic agent, a silane coupling agent, And may further include additives. These may be used alone or in combination of two or more.

The adhesive layer 130 may include a resin composition that is excellent in transparency and capable of forming a crosslinking suitable for maintaining the shape of the optical structure. For example, an epoxy resin-Lewis acid type, polyethylol type, unsaturated polyester-styrene type, acrylic acid or methacrylic acid ester type can be used. Of these resins, acrylic resin or methacrylic acid ester resin Can be used. For example, oligomers such as polyurethane acrylates or methacrylates, epoxy acrylates or methacrylates, polyester acrylates or methacrylates, acrylate or methacrylate monomers with polyfunctional or monofunctional groups, They can be used alone or in combination.

Hereinafter, a backlight unit, which is another aspect of the present invention, will be described with reference to FIG. 5 is a perspective view of a backlight unit 1000 according to an embodiment of the present invention.

5, a backlight unit 1000 according to an exemplary embodiment of the present invention includes a light source 510, a light guide plate 520 for guiding light emitted from the light source 510, A reflective sheet 530, a composite optical sheet 300 provided on the light guide plate 520 and a protective sheet 540 provided on the composite optical sheet 300. In addition, a light source cover 510a may be provided outside the light source 510 of the backlight unit 1000. Although not shown here, a liquid crystal display device can be constructed by stacking a liquid crystal display panel and an antireflection layer on the backlight unit 1000 in order.

The light source 510 generates light, and various light sources such as a linear light source lamp, a surface light source lamp, a CCFL, and an LED may be used.

The light guide plate 520 has an incident surface on which light is incident from the light source 510 and an exit surface perpendicular to the incident surface and guides the light incident from the light source 510 to the compound optical sheet 300, It can be omitted when a light source is adopted.

The reflective sheet 530 reflects the light generated by the light source 510 and supplies the light to the composite optical sheet 300.

The composite optical sheet 300 can be formed directly on the exit surface of the light guide plate 520 according to the embodiments of the present invention and can exhibit excellent brightness without addition of a separate diffusion sheet or a light condensing sheet, can do.

Hereinafter, the present invention will be described in more detail by way of examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention.

Example 1

A hexagonal microlens (acrylic resin, refractive index: 1.48) having a height of 16 탆 and a pitch of 40 탆 was regularly distributed on the light exit surface of a first base film (Toyobo PC film) having a thickness of 125 탆 to form an optical pattern Respectively.

An adhesive layer (urethane acrylate resin, TESK A-2579) having a thickness of 3 탆 was formed on the lower side of the first optical sheet.

A prism pattern (acrylic resin, refractive index: 1.55) was formed on the light exit surface of a second base film (Toyobo PC film) having a thickness of 125 탆 on the second optical sheet. The prism pattern was formed by arranging a prism having a height H1 of 35 mu m and a pitch P of 70 mu m on the second base film.

The arrangement interval L2 of two neighboring adhesion columns in the longitudinal direction of the prism is set to be 280 占 퐉 so that the arrangement interval L1 is 280 占 퐉 for each of the four prisms in the direction perpendicular to the longitudinal direction of the prism on the prism pattern To form an adhesive pillar. The diameter (D) of the adhesive pillar was 35 mu m and the height (H2) was 39 mu m. The adhesive layer penetrated 0.5 mu m to integrate the first optical sheet and the second optical sheet.

The properties of the composite optical sheet thus prepared were measured, and the results are shown in Table 1 below.

Example 2

A composite optical sheet was prepared in the same manner as in Example 1, except that the cross section of the adhesive pillar was square and the cross-section of the adhesive pillar was 35 mu m in width and length.

The properties of the composite optical sheet thus prepared were measured, and the results are shown in Table 1 below.

Comparative Example 1

Except that the adhesive pillar was extended from the prism portion of the prism pattern and had a cross section in the form of a line having a length of 500 mu m and a width of 20 mu m in the longitudinal direction of the prism and a height of 4 mu m extending from the prism portion A composite optical sheet was prepared in the same manner as in Example 1.

The properties of the composite optical sheet thus prepared were measured, and the results are shown in Table 1 below.

How to measure property

(1) Luminance: The composite optical sheet of the above-described example and comparative example was fixed to a backlight unit for a 32-inch liquid crystal display panel, and the luminance at 13 points and 5 points was measured using a luminance meter (Model: SR3, Japan TOPCON) And the average value was obtained. At this time, the light source of the backlight unit uses an LED lamp. The brightness was expressed in% as a reference value of the brightness of the optical film having the structure in which the 60 mu m diameter MLA sheet was laminated in two layers.

(2) Side lobe: Viewing angle and brightness were measured with a viewing angle measuring device (Monota and EZCON models), and the side lobes were judged to be the degree of spreading from the concentric circle of the photomultiploic region Respectively. The side lobes were evaluated as strong, while small ones were evaluated as weak.

(3) Viewing angle: The viewing angle was measured with a viewing angle measuring device (Monota, EZCON model).

(4) Moire phenomenon: The sheet was assembled on a 32-inch panel (model name: CY-HF320CSLV1H) and visually observed to evaluate whether or not the moire phenomenon occurred. (With moire phenomenon: O, no moire phenomenon: X)

Example 1 Example 2 Comparative Example 1 Brightness (%) 100 97 93 Side Robe weakness weakness Strong Viewing angle (°) 62 62 62 Moire X X O

As shown in the results of Table 1, the composite optical sheet of Example 1-2, in which the first optical sheet and the second optical sheet were integrated with a columnar or square column in which the adhesive pillar was formed on the valley of the prism pattern, Shaped laminate extending from the prism portion and extending in the same direction as the longitudinal direction of the prism, the side lobe phenomenon is minimized without deteriorating the viewing angle, and the moire phenomenon And it can be seen that it did not occur.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (14)

The first optical sheet on which the first optical pattern is formed and the second optical sheet on which the second optical pattern is formed
An adhesive layer formed on one surface of the first optical sheet, and a plurality of adhesive posts penetrating the adhesive layer,
Wherein the adhesive pillar is formed in a valley between two adjacent patterns of the second optical pattern,
And the second optical pattern is spaced apart from the adhesive layer. The method according to claim 1,
The first optical sheet includes a first base film and a first optical pattern formed on a light exit surface of the first base film,
And the second optical sheet includes a second base film and a prism pattern which is a second optical pattern formed on a light exit surface of the second base film. 3. The method of claim 2,
The prism pattern includes a plurality of prisms having the same height H1 and pitch P,
And the adhesive pillar is formed on a crest between two adjacent prisms of the prism pattern. The method of claim 3,
The height H1 of the prism is 10 to 50 mu m and the pitch P is 20 to 100 mu m. The method of claim 3,
Wherein a ratio (H2 / H1) of a height (H2) of the adhesive column to a height (H1) of the prism is 1.1 to 1.4. The method according to claim 1,
Wherein the ratio (G / T) of the thickness (T) of the adhesive layer to the penetration length (G) through which the adhesive pillar penetrates the adhesive layer is 0.05 to 0.7. The method according to claim 1,
Wherein the adhesive pillar is a columnar composite optical sheet. 8. The method of claim 7,
The diameter (D) of the adhesive pillar is 30 to 70 탆,
(D / P) of the diameter (D) of the adhesive pillar to the pitch (P) of the prism is 0.1 to 0.8. The method according to claim 1,
Wherein the adhesive pillars are arranged with a constant period. 10. The method of claim 9,
Wherein the adhesive pillar has a period arranged per n prisms in a direction perpendicular to the longitudinal direction of the prism, and n is an integer of 4 or more and 9 or less. 10. The method of claim 9,
And the adhesive pillar formed on the same valley in the longitudinal direction of the prism is arranged at an array interval of 4P (pitch of the prism) to 20P. 3. The method of claim 2,
Wherein the first optical pattern and the second optical pattern are patterns selected from the group consisting of a microlens pattern, an emboss pattern, a lenticular lens pattern, a prism pattern, a pyramid pattern, and a mixed pattern thereof. 3. The method of claim 2,
The thickness of the first base film is 50 to 300 탆,
The thickness of the second base film is 50 to 300 탆,
Wherein the adhesive layer has a thickness of 1 to 30 占 퐉. A backlight unit comprising the composite optical sheet according to any one of claims 1 to 13.
KR1020130147953A 2013-11-29 2013-11-29 Complex optical sheet and back light unit comprising the same KR20150062864A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017047947A1 (en) * 2015-09-17 2017-03-23 삼성에스디아이 주식회사 Optical sheet and optical display device comprising same
KR20190059337A (en) * 2017-11-22 2019-05-31 삼성디스플레이 주식회사 Display Device
KR20190065920A (en) * 2017-12-04 2019-06-12 주식회사 비욘드아이즈 Semiconductor package with prism sheet having dam structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017047947A1 (en) * 2015-09-17 2017-03-23 삼성에스디아이 주식회사 Optical sheet and optical display device comprising same
KR20190059337A (en) * 2017-11-22 2019-05-31 삼성디스플레이 주식회사 Display Device
KR20190065920A (en) * 2017-12-04 2019-06-12 주식회사 비욘드아이즈 Semiconductor package with prism sheet having dam structure
US11580773B2 (en) 2017-12-04 2023-02-14 Arcsoft Corporation Limited Semiconductor package having self-aligned structure

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