KR20140069926A - Lamination Type Optical Sheet - Google Patents

Lamination Type Optical Sheet Download PDF

Info

Publication number
KR20140069926A
KR20140069926A KR1020120137808A KR20120137808A KR20140069926A KR 20140069926 A KR20140069926 A KR 20140069926A KR 1020120137808 A KR1020120137808 A KR 1020120137808A KR 20120137808 A KR20120137808 A KR 20120137808A KR 20140069926 A KR20140069926 A KR 20140069926A
Authority
KR
South Korea
Prior art keywords
prism
sheet
prism sheet
height
adhesive layer
Prior art date
Application number
KR1020120137808A
Other languages
Korean (ko)
Inventor
박창원
김경화
류득수
김수지
김태경
Original Assignee
코오롱인더스트리 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 코오롱인더스트리 주식회사 filed Critical 코오롱인더스트리 주식회사
Priority to KR1020120137808A priority Critical patent/KR20140069926A/en
Publication of KR20140069926A publication Critical patent/KR20140069926A/en

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • 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
    • G02F1/1336—Illuminating devices

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

The present invention relates to a lamination type optical sheet. The lamination type optical sheet comprises a first prism sheet in which a plurality of prisms are formed; an adhesive layer which is formed on a bottom surface of the first prism sheet; and a second prism sheet which is laminated on a bottom surface of the adhesive layer and in which a first prism and a second prism higher than the first prism are formed, wherein the first prism sheet includes a prism insertion portion formed on a bottom surface thereof, and the second prism formed on the second prism sheet is inserted into the prism insertion portion formed on the bottom surface of the first prism sheet, thereby improving adhesive strength without reduction in luminance.

Description

Laminated Optical Sheet {Lamination Type Optical Sheet}

The present invention relates to a combined optical sheet used in a backlight unit.

Only the light incident on the prism sheet in a predetermined angular range can be focused while the light emitted from the light source is diffused in the diffusion sheet and is condensed in the prism sheet. When some light that has not been condensed is extinct or re-condensed, A yellow band occurs and a rainbow phenomenon occurs in which a rainbow colored wave generated in the extinction portion and the re-condensation portion occurs.

In order to prevent such a rainbow phenomenon, a composite prism sheet having increased turbidity by applying light diffusion beads to the back surface of a prism sheet has been actively developed.

Also, since the BLU light source is changed to LED, a lot of heat is generated, and therefore, the thickness of the PET film used as the light-converging optical sheet should be 250 μm or more. However, in recent years, LDC TV and MNT have become slimmer. To solve this problem, improvement of heat resistance of 188 μm PET film has become an issue. The improvement of the heat resistance of the PET film itself has become an issue. Not only a method of raising the heat resistance of the PET film itself but also an improvement of the heat resistance by joining two sheets of prism films has become an issue. In addition to the method of raising the heat resistance of the PET film itself, researches for improving the heat resistance by laminating two prism films have been carried out steadily. However, when the two prism films are merely laminated, the luminance is lowered and the adhesion force between the prisms is low. (Fig. 1).

The present invention seeks to provide a combined optical sheet having excellent brightness and adhesion.

Accordingly, the present invention provides, as a first preferred embodiment, a prism sheet comprising: a first prism sheet having a plurality of prisms formed therein; An adhesive layer formed on a lower surface of the first prism sheet; And a second prism sheet laminated on a lower surface of the adhesive layer, the second prism sheet having a first prism and a second prism having a height higher than that of the first prism, the first prism sheet having a prism And a second prism formed on the second prism sheet is inserted into a prism insertion portion formed on the lower surface of the first prism sheet.

The prism inserting unit according to this embodiment may have a hemispherical shape.

The hemispherical shape according to the embodiment may have a radius of 2 to 5 탆.

The prism inserting unit according to the embodiment may be laser-processed.

The first prism according to the embodiment may have a height of 15 to 25 탆 and a pitch of 30 to 50 탆.

The second prism according to this embodiment may have a height of 20 to 35 μm and a pitch of 40 to 70 μm.

The height of the second prism according to the embodiment may be 5 to 10 mu m larger than the height of the first prism.

The arrangement of the prisms formed on the first prism sheet and the arrangement of the prisms formed on the second prism sheet according to the above embodiments may be crossed at an intersection angle of 85 to 95 degrees.

According to a second preferred embodiment of the present invention, there is also provided a backlight unit including the above-described optical interposer.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a tethered optical sheet excellent in brightness and adhesive force as compared with conventional tethered optical sheets.

Fig. 1 shows a conventional optical sheet in which two prism sheets are stacked.
Fig. 2 shows a combined optical sheet including a first prism sheet and a second prism sheet according to the present invention.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a prism sheet comprising: a first prism sheet (10) having a plurality of prisms; An adhesive layer 20 formed on the lower surface of the first prism sheet 10; And a second prism sheet 30 laminated on a lower surface of the adhesive layer 20 and having a first prism 31 and a second prism 32 higher in height than the first prism 31, The optical sheet according to claim 1, wherein the first prism sheet (10) has a prism insertion portion (11) formed on its lower surface, and a second prism (12) formed on the second prism sheet (30) 10), which is inserted into a prism insertion portion (11) formed on the lower surface of the optical fiber (10).

[First prism sheet]

The first prism sheet includes a substrate layer and a structure layer formed on one surface of the substrate layer, and the structure layer has a plurality of prisms formed thereon.

The first prism sheet has a pattern such as a straight pattern, a wave pattern, a variable pattern, and the like, but is not limited to a pattern that can be formed by a prism.

The prism formed in the second prism sheet structure layer may have a height of 15 to 25 μm and a pitch of 30 to 50 μm in consideration of luminance, but the present invention is not limited thereto.

[Adhesive layer]

The adhesive layer may be formed by applying a liquid material selected from a thermosetting adhesive, a UV curable adhesive, and a pressure-sensitive adhesive, or may be formed of a solid adhesive material such as a double-sided tape. The thickness of the adhesive layer may be 1 to 5 占 퐉, but the present invention is not limited thereto, so as to provide a firm fixing force and an appropriate brightness between the prism sheets while minimizing the influence on the optical characteristics of the optical sheet.

[Second prism sheet]

The second prism sheet includes a substrate layer and a structure layer formed on one side of the substrate layer. The structure layer includes a plurality of prisms, that is, a first prism and a second prism having a height higher than the first prism, Respectively.

The first prism may have a height of 15 to 25 탆 and a pitch of 30 to 50 탆. The second prism may have a height of 20 to 35 탆 and a pitch of 40 to 70 탆.

Here, when the pitch of the first prism and the pitch of the second prism deviate from the numerical range defined above, there is a problem that the luminance is lowered.

[Prism insertion portion]

Meanwhile, a prism inserting portion may be formed on the lower surface of the first prism sheet, and a second prism of the second prism sheet may be inserted into the prism inserting portion. Here, the prism inserting portion can be formed by laser processing. The prism inserting portion may be processed using a bite as in the case of a mother roll processing, but the product may be damaged due to burrs generated during processing. Therefore, it is effective to form the prism inserting portion by laser processing.

If the radius is less than 2 탆, not only the adhesive force is lowered but also the prism is not sufficiently inserted. If the radius is more than 5 탆, the prism inserting portion The first prism of the two-prism sheet abuts on the adhesive layer, resulting in a sudden decrease in luminance.

In this manner, the second prism of the second prism sheet is inserted into the prism inserting portion formed on the lower surface of the first prism sheet, thereby improving the adhesion between the first prism sheet and the second prism sheet without lowering the brightness of the optical sheet .

[Cross shape of two films]

The first prism sheet and the second prism sheet may be laminated so that the angle of intersection of the prisms formed on each sheet is 85 to 95 degrees. When the angle of intersection is less than 85 degrees or 95 degrees There is a problem of lowering the luminance, and preferably the crossing angle may be 88 to 92 degrees.

In the tethered optical sheet according to the present invention, the first prism sheet and the second prism sheet each include a base layer and a structure layer formed on one surface of the base layer, wherein the base layer is a polyethylene terephthalate film, a polycarbonate Film, a polypropylene film, a polyethylene film, a polystyrene film, a polyepoxy film, or the like. Further, the thickness of the substrate may be 10 to 1000 mu m, preferably 15 to 400 mu m. If the thickness of the substrate layer is less than 10 mu m, the mechanical strength and thermal stability become poor. When the thickness exceeds 1000 mu m, the flexibility of the film is lowered and the transmitted light is lost.

In the first prism sheet and the second prism sheet, the structure layer may be formed of a thermosetting resin or an ultraviolet ray curable resin. Examples of the transparent resin include an unsaturated fatty acid ester, an aromatic vinyl compound, an unsaturated fatty acid and a derivative thereof, Dibasic acids and derivatives thereof, vinylcyanide compounds such as methacrylonitrile, and the like.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the scope of the present invention is not limited to the following Examples.

Example  One

A composite optical sheet including a first prism sheet, an adhesive layer formed on the upper surface of the first prism sheet and a second prism sheet laminated on the upper surface of the adhesive layer in the form shown in Table 1 was prepared as follows.

A polyethylene terephthalate film Astroll (Kolon) having a thickness of 188 占 퐉 was used as a base layer, and an acrylic type curing resin composition (BRI-UV-high refractive index for prism sheet) Followed by curing to prepare a first prism sheet. A prism having a pitch of 50 占 퐉 and a height of 25 占 퐉 was uniformly formed in the structural layer of the first prism sheet.

A prism inserting portion was formed on the bottom surface of the base layer of the first prism sheet by using a laser (a light beam optics, a CO 2 source, capable of processing 4.5 m per minute, output of 100 w). At this time, a plurality of hemispherical shapes having a radius of 0.5 mu m are formed at intervals of 360 mu m in the prism inserting portion.

An adhesive (KOLON KLS-U8, Kolon Life Science) was roll-coated on the lower surface of the first prism sheet by a microgravure method, and then an adhesive layer was formed.

A polyethylene terephthalate film Astroll (Kolon) having a thickness of 188 占 퐉 was used as a base layer, and an acrylic type curing resin composition (BRI-UV-high refractive index for prism sheet) And a second prism sheet was prepared by curing. A first prism having a height of 25 mu m and a pitch of 50 mu m and a second prism having a height of 30 mu m and a pitch of 60 mu m are formed in the structure layer of the second prism sheet. Here, the first prism and the second prism are formed in the form of a straight pattern. Also, the materials of the first prism and the second prism were a mixture of acrylate containing Miramer 6020 having a refractive index of 1.57 (isopropyl acrylate), isocyanurate and 1,6-hexane diacrylate.

The second prism sheet is inserted into the prism insertion portion of the lower surface of the first prism sheet and the first prism sheet is inserted into the first prism sheet having the adhesive layer, So that the angle of intersection of the prisms each formed was 90 degrees.

Example  2

A padded optical sheet was prepared in the same manner as in Example 1, except that the height of the first prism was 15 탆 and the pitch was 30 탆.

Example  3

A prismatic optical sheet was prepared in the same manner as in Example 1, except that the height of the second prism was 35 mu m and the pitch was 70 mu m.

Example 4

A paired optical sheet was prepared in the same manner as in Example 1, except that the second prism was formed in the form of a wave pattern.

Example  5

A tethered optical sheet was prepared in the same manner as in Example 1, except that the adhesive layer was formed using adhesive tape (# 9197, 3M).

Comparative Example  One

A padded optical sheet was prepared in the same manner as in Example 1, except that the pre-juice insert was not formed.

The optical sheets prepared in Examples and Comparative Examples were measured for brightness and adhesive force in the following manner, and the results are shown in Table 2.

Luminance

The optical sheets of the above-described Examples and Comparative Examples were stacked and fixed on a backlight unit for a 24-inch liquid crystal display panel, and the luminance at arbitrary 13 points was measured using a luminance meter (Model: BM-7, TOPCON Japan) And the average value thereof was obtained.

Adhesion

Peel Test (ASTM D6862-11 Standard Test Method for 90 degree Peel Resistance of Adhesives) was used to measure the adhesive strength of the optical sheet.


 The first prism The second prism Laser study Cross angle Adhesive layer Height pitch Height pitch rescue shape radius Example 1 25 m 50 탆 30 탆 60 탆 Straight pattern Hemispherical 2.5 탆 90 degrees KLS-U8 Example 2 15 탆 30 탆 30 탆 60 탆 Straight pattern Hemispherical 2.5 탆 90 degrees KLS-U8 Example 3 25 m 50 탆 35 탆 70 탆 Straight pattern Hemispherical 2.5 탆 90 degrees KLS-U8 Example 4 25 m 50 탆 30 탆 60 탆 Wave pattern Hemispherical 2.5 탆 90 degrees KLS-U8 Example 5 25 m 50 탆 30 탆 60 탆 Straight pattern Hemispherical 2.5 탆 90 degrees Adhesive tapes (# 9197, 3M) Comparative Example 1 25 m 50 탆 30 탆 60 탆 Straight pattern - - 90 degrees KLS-U8

Luminance Adhesion Example 1 96% 0.1kgf / cm Example 2 95% 0.09kgf / cm Example 3 96% 0.1kgf / cm Example 4 97% 0.1kgf / cm Example 5 92% 0.17kgf / cm Comparative Example 1 90% 0.04 kgf / cm

As can be seen from the physical property measurement results, when two prism sheets are laminated, the brightness and the adhesive force of the optical sheet are lowered when the laminate is simply laminated without forming the prism insertion portion (Comparative Example 1).

10: a first prism sheet, 11: a prism-
20: Adhesive layer
30: second prism sheet, 31: first prism, 32: second prism

Claims (9)

A first prism sheet having a plurality of prisms formed thereon;
An adhesive layer formed on a lower surface of the first prism sheet; And
And a second prism sheet laminated on a lower surface of the adhesive layer and having a first prism and a second prism having a height higher than that of the first prism,
Wherein the first prism sheet has a prism inserting portion formed on a lower surface thereof,
And a second prism formed on the second prism sheet is inserted into a prism insertion portion formed on a lower surface of the first prism sheet. The method according to claim 1,
Wherein the prism inserting portion has a semicircular shape of a negative angle. 3. The method of claim 2,
Wherein the hemispherical shape has a radius of 2 to 5 mu m. The method according to claim 1,
Wherein the prism inserting portion is laser-processed. The method according to claim 1,
Wherein the first prism has a height of 15 to 25 占 퐉 and a pitch of 30 to 50 占 퐉. The method according to claim 1,
Wherein the second prism has a height of 20 to 35 占 퐉 and a pitch of 40 to 70 占 퐉. The method according to claim 1,
Wherein the second prism is 5 to 10 mu m larger in height than the first prism. The method according to claim 1,
Wherein the arrangement of the prisms formed on the first prism sheet and the arrangement of the prisms formed on the second prism sheet are crossed at an intersection angle of 85 to 95 degrees. 9. A backlight unit comprising the above-described optical type combination optical sheet according to any one of claims 1 to 8.
KR1020120137808A 2012-11-30 2012-11-30 Lamination Type Optical Sheet KR20140069926A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020120137808A KR20140069926A (en) 2012-11-30 2012-11-30 Lamination Type Optical Sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020120137808A KR20140069926A (en) 2012-11-30 2012-11-30 Lamination Type Optical Sheet

Publications (1)

Publication Number Publication Date
KR20140069926A true KR20140069926A (en) 2014-06-10

Family

ID=51124935

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020120137808A KR20140069926A (en) 2012-11-30 2012-11-30 Lamination Type Optical Sheet

Country Status (1)

Country Link
KR (1) KR20140069926A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160003908A (en) * 2014-07-01 2016-01-12 엘지디스플레이 주식회사 Backlight unit and display apparatus having the same
KR20160072049A (en) * 2014-12-12 2016-06-22 삼성전자주식회사 Complex optical sheet, liquid crystal display using the same and method of manufacturing the same
CN107608120A (en) * 2017-10-11 2018-01-19 深圳Tcl新技术有限公司 Liquid crystal display compound film sheet, liquid crystal module and liquid crystal display device
JP2019518239A (en) * 2016-05-15 2019-06-27 スリーエム イノベイティブ プロパティズ カンパニー Light redirecting film structure and method of manufacturing the same
WO2021212376A1 (en) * 2020-04-22 2021-10-28 瑞仪(广州)光电子器件有限公司 Optical film, backlight module, and display device
KR102557656B1 (en) 2022-07-12 2023-07-19 조창희 Laminated optical sheet for back light unit

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160003908A (en) * 2014-07-01 2016-01-12 엘지디스플레이 주식회사 Backlight unit and display apparatus having the same
KR20160072049A (en) * 2014-12-12 2016-06-22 삼성전자주식회사 Complex optical sheet, liquid crystal display using the same and method of manufacturing the same
JP2019518239A (en) * 2016-05-15 2019-06-27 スリーエム イノベイティブ プロパティズ カンパニー Light redirecting film structure and method of manufacturing the same
CN107608120A (en) * 2017-10-11 2018-01-19 深圳Tcl新技术有限公司 Liquid crystal display compound film sheet, liquid crystal module and liquid crystal display device
CN107608120B (en) * 2017-10-11 2021-11-09 深圳Tcl新技术有限公司 Liquid crystal display composite membrane, liquid crystal module and liquid crystal display device
WO2021212376A1 (en) * 2020-04-22 2021-10-28 瑞仪(广州)光电子器件有限公司 Optical film, backlight module, and display device
CN113906338A (en) * 2020-04-22 2022-01-07 瑞仪(广州)光电子器件有限公司 Optical film, backlight module and display device
US11320580B2 (en) 2020-04-22 2022-05-03 Radiant (Guangzhou) Opto-Electronics Co. Ltd. Light directing sheet, backlight module, and display device
KR102557656B1 (en) 2022-07-12 2023-07-19 조창희 Laminated optical sheet for back light unit

Similar Documents

Publication Publication Date Title
KR20140069926A (en) Lamination Type Optical Sheet
KR20130005330A (en) Optical film and manufacturing method thereof, liquid cristal display apparatus using the optical film
CN107831620A (en) A kind of novel and multifunctional optical compound film and preparation method thereof
CN103149610B (en) A kind of MULTILAYER COMPOSITE prismatic lens and preparation method thereof
JP6638239B2 (en) Optical laminate and liquid crystal display device
KR20130035778A (en) Diffuser sheet
CN106814496A (en) Optical film and the liquid crystal display including optical film
KR20190128731A (en) Top light diffusing sheet and backlight unit having the same
KR20140003855A (en) Lamination type optical sheet
KR102223920B1 (en) Optical film for improving contrast ratio, polarizing plate comprising the same and liquid crystal display apparatus comprising the same
KR101233533B1 (en) Backlight Unit Assembly Comprising Light Diffusion member
KR20150002309A (en) Complex optical sheet and back light unit comprising the same
KR101802578B1 (en) Polarizing plate and liquid crystal display comprising the same
EP3495855A1 (en) Diffusion element and manufacturing method thereof, backlight module and display device
KR20150085382A (en) Complex optical sheet and optical display apparatus comprising the same
JP2006227058A (en) Resin film for display device and display device
KR101507298B1 (en) Functional reflection sheet for liquid crystalline display
US20130271825A1 (en) Condensing type optical sheet
KR20130035537A (en) Liquid crystal display device
KR20150034553A (en) Complex optical sheet and liquid crystal display comprising the same
KR20140014736A (en) Optical sheet and display apparatus comprising the same
KR20140135546A (en) Composite optical sheet and optical display device comprising the same
KR101370167B1 (en) Backlight unit assembly
KR20130002757A (en) Optical film improved brightness
KR100973599B1 (en) Optical film eliminating protective films and Preparing thereof

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination