TWI282016B - Optical film and uses thereof - Google Patents

Optical film and uses thereof Download PDF

Info

Publication number
TWI282016B
TWI282016B TW93109522A TW93109522A TWI282016B TW I282016 B TWI282016 B TW I282016B TW 93109522 A TW93109522 A TW 93109522A TW 93109522 A TW93109522 A TW 93109522A TW I282016 B TWI282016 B TW I282016B
Authority
TW
Taiwan
Prior art keywords
optical film
substrate
resin
film
group consisting
Prior art date
Application number
TW93109522A
Other languages
Chinese (zh)
Other versions
TW200534001A (en
Inventor
Tu-Yi Wu
Lung-Lin Hsu
Jiun-Ting Wang
Original Assignee
Eternal Chemical Co Ltd
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 Eternal Chemical Co Ltd filed Critical Eternal Chemical Co Ltd
Priority to TW93109522A priority Critical patent/TWI282016B/en
Publication of TW200534001A publication Critical patent/TW200534001A/en
Application granted granted Critical
Publication of TWI282016B publication Critical patent/TWI282016B/en

Links

Abstract

The invention pertains to an optical film comprising a substrate, characterized in that at least one of the surfaces of the substrate has a coating containing inorganic particles. The inventive optical film may be used in the reflective sheet for reflecting backlight in liquid crystal displays so as to enhance the brightness performance of the liquid crystal displays.

Description

1282016 发明, 发明 发明 发明: The present invention relates to an optical film comprising a substrate characterized in that at least one substrate surface has a coating containing inorganic particles. The optical film of the present invention can be used for a backlight reflector of a liquid crystal display to achieve an effect of enhancing the brightness of the liquid crystal display. [Prior Art] The imaging of a liquid crystal display (LCD) firstly uses a back light source to project a light source, which first passes through a polarizing plate and then passes through liquid crystal molecules. The way is to change the angle of the light that penetrates the liquid crystal, and then the light passes through the front color filter (c〇1〇rfilter) and the other polarizer. Therefore, as long as the voltage value of the stimulating liquid crystal molecules is changed, the intensity and color of the last appearing light can be controlled, and then the color combinations of different shades can be changed. The brightness of the LCD depends on the transmittance of the liquid crystal cell and the color filter. Another important factor is the brightness of the backlight. Therefore, if you want to bring back the brightness of the LCD surface, you should start by increasing the brightness of the backlight. The use of a monthly light source as an important component of the LCD display function and a source of brightness is very important for improving the brightness of the liquid crystal display. Prior to the present invention, the industry has tried various ways to improve the brightness of the LCD display from the backlight, and adjust the source of the lamp to increase the brightness of the display by increasing the number of lamps and/or increasing the lamp's original force rate. Faced with large size and power consumption, etc., it can be improved from the light guide plate, but it will face difficulties in the design of the light guide plate material. Applying a reflective film from the backlight can improve the emission efficiency of the light source and increase Brightness of emission. Therefore, an important component of a reflective film-based liquid crystal display, its reflectivity will affect the brightness of the display. In addition, because the light emitted by the backlight contains ultraviolet (UV), it is easy to cause the polymer in the reflective film. The yellowing of the resin causes the reflection effect to be weakened and the chromatic aberration of the LCD. The current solution is to apply a layer of ultraviolet absorber on the reflective film, but if the amount of the ultraviolet absorber is too small, the anti-yellowing effect is limited, and if the amount is increased, The degree of adhesion is reduced. The inventors of the present invention have found through extensive research that coating the surface of the reflective film with a coating containing inorganic particles is not a problem. The adhesion of the reflective film absorbs most of the UV light in the backlight, so it has anti-UV function, and can make the reflective film durable and reduce the thickness of the reflective film. Related design and mold, gp can make the brightness of the liquid crystal display can effectively solve the above disadvantages. SUMMARY OF THE INVENTION The main object of the present invention is to provide an optical film comprising a substrate characterized by at least a base The surface of the material has a coating of I inorganic particles. The other object is to provide a method for enhancing the brightness of a liquid crystal display. [Embodiment] The present invention provides an optical film '纟-substrate, which is characterized by one less The surface of the substrate has a coating layer containing inorganic particles. The type of the inorganic film used in the optical film of the present invention is not particularly limited to 1282016, as long as the inorganic particles have the property of absorbing ultraviolet rays. The type of inorganic particles, for example, but not limited to, zinc oxide cerium oxide, titanium dioxide, aluminum oxide, calcium sulfate, barium sulfate, calcium carbonate or a mixture thereof. The particle size is generally from 丨 to (7)^nanometer, preferably from 20 to 50 nm. The substrate used in the optical film of the present invention is well known to those skilled in the art. The substrate comprises at least one layer of a polymer resin. The polymer resin is not particularly limited, and is, for example but not limited to, a polyolefin resin such as polyethylene (PE) or polypropylene (polyvinyl acetate resin ( Polyester resin ), such as polyethylene terephthalate (PET); polyacrylate (p〇lyacryiateresin) resin, such as polymethyl methacrylate (PMMA); polycarbonate resin (p〇lycarb〇nate resin) , a poly-p-perurethane resin, or a mixture thereof. According to a preferred embodiment of the present invention, the optical film of the present invention is a polyester resin substrate, preferably polyethylene terephthalate. The substrate may optionally contain inorganic particles known to those skilled in the art, such as zinc oxide, cerium oxide, titanium dioxide, aluminum oxide, calcium sulfate, barium sulfate, calcium carbonate or mixtures thereof. According to one of the preferred embodiments of the present invention, the substrate of the present invention may be a multilayer substrate in which one or more layers contain the inorganic particles. Specifically, the present invention can be, for example, a three-layer substrate in which the inorganic particles are contained in the intermediate layer. The coating on the surface of the substrate of the present invention may optionally contain additives known to those skilled in the art, such as fluorescent whitening agents or ultraviolet light absorbers or mixtures thereof. 1282016 UV absorbers useful in the surface coating of optical films of the present invention are well known to those skilled in the art and are, for example, benzotriazoles, benzotdazines, and ketones. Benzophenones or saicylic acid derivatives. The type of the fluorescent whitening agent which can be used for the surface coating of the optical film of the present invention is not particularly limited and is known to those skilled in the art. These include, but are not limited to, benzazole xaz〇les, benzimidazoles or diphenylethylene bistriazines. The optical film of the present invention can be used as a reflective film. Therefore, the present invention further provides a method for enhancing the brightness of a liquid crystal display, which comprises using the above optical film as a reflective film of a backlight in a liquid crystal display to enhance the brightness of the liquid crystal display. efficacy. The following examples are intended to further illustrate the invention, but are not intended to limit the scope of the invention. Modifications and modifications readily achievable by anyone familiar with the technology are included in the disclosure of this specification and the scope of the attached patent application. Example 1 126.6 g of methacrylic resin (about 6 % by weight of solid content) was added to methyl ethyl ketone / toluene (45 g each), stirred (rotation speed 1 rpm), and then 75 nm lead oxide was sequentially added. 3 g of titanium dioxide/barium sulfate and 18. 4 g of a hardener (desmodur 3390, available from Bayer) to form 25 g of paint (solids 4 〇〇 / 〇). The coating was coated with κυχ-15〇 (purchased from Ding (7)) substrate 1282016, and after drying, a coating film of 1 〇pm was obtained, and after standing for 7 days, a weathering test was carried out (Q-panel, Q-panel) Company) to measure the change in the yellowing index value (Yellowing Index, 'ΥΓ) of the coating film at different exposure times. The results obtained are shown in Table 1 below. Example 2 The procedure of Example 1 was repeated except that the substrate was changed to E60L (purchased from Toray). The weathering test results of the obtained coating film are shown in Table 1 below. Comparative Example 1 The procedure of Example 1 was repeated except that 3 g of 75 nm lead oxide/titanium dioxide/sulfur was replaced by 3 g of an organic UV absorber (Tinuvin P, available from Ciba). The weathering test results of the obtained coating films are shown in Table 1 below. Table 1 Film thickness exposure 100 hr ΔΥΙ Exposure 200 hr ΔΥΙ Exposure 300 hr ΔΥΙ Exposure 500 hr ΔΥΙ Example 1 10 μηι 0.60 0.65 0.90 1.18 Example 2 10 μχη 0.61 ~~067~ 0.92 1.20 Comparative Example 1 10 μιη 3.74 6.05 7.95 9.34 • According to one data, an optical film made by adding inorganic particles to different substrates has the same anti-yellowing effect. 2. It is known from the data shown in Table 1 that the optical film to which the inorganic particles are added has a better anti-yellowing effect than the optical film generally containing a UV absorber. Thus, the optical film of the present invention can provide a wider range of applications.

Claims (1)

  1. I /.fS B 1 / 1 - 11 - 1 patent application year and month repair 22:] Chinese patent application scope replacement (9 ^ Dan 22 = 1 pick, apply for patent garden: I an optical film, The invention comprises a substrate, characterized in that at least one substrate surface has a coating containing inorganic particles, which is used as a reflective film. 2. The optical film of the patent scope is selected from the group consisting of oxidation. a group consisting of zinc, cerium oxide, titanium dioxide, aluminum oxide, calcium sulfate, barium sulfate, calcium carbonate, and mixtures thereof. 3. The optical film of claim </ RTI> wherein the inorganic particles have from 1 to 100 nm. The optical film of claim 3, wherein the inorganic particle has a particle diameter of 20 to 50 nm. 5. The optical film of claim 1, wherein the substrate comprises at least The polymer film of claim 5, wherein the polymer resin is selected from the group consisting of polyester resins, polyacrylate resins, polyolefins, polycarbonate resins, and poly Amino phthalate resin and its mixture 7. The optical film of claim 6, wherein the polyester resin is polyethylene terephthalate. 8. The optical film of claim 6, wherein the polyacrylic acid is The resin is a phthalic acid acrylate. The optical film of claim 6, wherein the polyolefin resin is polyethylene or polypropylene. 1 0 · The optical film of claim 1 of the patent scope, Wherein the substrate further contains 92123-950927.doc 1282016, which comprises an inorganic substance. 11 12. 13. 'The optical sulphuric acid according to claim 10 is composed of zinc oxide, oxidized: ..., the inorganic substance is selected from the group consisting of cerium oxide and titanium dioxide. And an optical film of the invention of claim 4, wherein the coating comprises a glare brightener or a UV absorber or a mixture thereof. A method for enhancing the brightness of a liquid crystal display, comprising a reflective film which is used as a backlight in an optical film as in the first aspect of the patent application. 92123-950927.doc
TW93109522A 2004-04-06 2004-04-06 Optical film and uses thereof TWI282016B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
TW93109522A TWI282016B (en) 2004-04-06 2004-04-06 Optical film and uses thereof

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
TW93109522A TWI282016B (en) 2004-04-06 2004-04-06 Optical film and uses thereof
JP2005110247A JP2005301271A (en) 2004-04-06 2005-04-06 Optical film and its use
KR1020050028548A KR100915210B1 (en) 2004-04-06 2005-04-06 Optical film and uses thereof

Publications (2)

Publication Number Publication Date
TW200534001A TW200534001A (en) 2005-10-16
TWI282016B true TWI282016B (en) 2007-06-01

Family

ID=35332804

Family Applications (1)

Application Number Title Priority Date Filing Date
TW93109522A TWI282016B (en) 2004-04-06 2004-04-06 Optical film and uses thereof

Country Status (3)

Country Link
JP (1) JP2005301271A (en)
KR (1) KR100915210B1 (en)
TW (1) TWI282016B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100844884B1 (en) * 2006-12-05 2008-07-09 웅진케미칼 주식회사 Non-oriented optical reflection sheet having high-whiteness and manufacturing method thereof

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05281404A (en) * 1992-03-31 1993-10-29 Toshiba Lighting & Technol Corp Reflector
JP3250888B2 (en) * 1993-10-08 2002-01-28 三井化学株式会社 Matte reflection film
JPH10730A (en) * 1996-06-17 1998-01-06 Toyo Ink Mfg Co Ltd Light reflecting film
KR100692104B1 (en) * 1997-06-06 2007-12-24 스미또모 가가꾸 가부시키가이샤 A reflective liquid crystal display device and a light diffusing reflector
JPH11237506A (en) * 1998-02-20 1999-08-31 Nippon Shokubai Co Ltd Light-selective transmissible film
JP4275787B2 (en) * 1999-01-21 2009-06-10 住友大阪セメント株式会社 Shading film
JP3870731B2 (en) * 2000-07-12 2007-01-24 東レ株式会社 White film for surface light source reflector
JP2003139926A (en) * 2001-10-31 2003-05-14 Toray Ind Inc Optical reflection film and backlight device for image display using the same
JP2004004417A (en) * 2002-04-18 2004-01-08 Nitto Denko Corp Light diffusion sheet, optical device and image display device
KR20040078188A (en) * 2003-03-03 2004-09-10 주식회사 코오롱 Reflective film for backlight unit
KR20040085622A (en) * 2003-04-01 2004-10-08 주식회사 코오롱 Reflection film for back-light unit of LCD

Also Published As

Publication number Publication date
KR100915210B1 (en) 2009-09-02
TW200534001A (en) 2005-10-16
JP2005301271A (en) 2005-10-27
KR20060045530A (en) 2006-05-17

Similar Documents

Publication Publication Date Title
EP2510389B1 (en) Optical constructions incorporating a light guide and low refractive index films
TWI448717B (en) Polymerizable composition comprising low molecular weight organic component
CN100526916C (en) Multilayer optical adhesives and articles
JPWO2007020909A1 (en) Protective film for polarizing plate and polarizing plate
CN101124273B (en) Durable high index nanocomposites for AR coatings
CN102460244B (en) Lightguide with optical film containing voids and blacklight for display system
CA2339153C (en) Reflectors and transflectors
CN1277133C (en) Semi-transmitting semi-reflecting film and semi-transmitting semi-reflecting polarizing film
CN101251608B (en) Anti-glare film, method of manufacturing the same, and display device
KR101154807B1 (en) Antidazzle coating composition, antidazzle film and process for producing the same
TWI380050B (en)
JPWO2005066663A1 (en) Light diffusion film, surface light source device and liquid crystal display device
KR101174951B1 (en) Scratch-resistant optical film having organic particles with highly uniform particle size
US20040056994A1 (en) Scattering sheet, and laminated sheet and liquid crystal display device using the same
JP4552480B2 (en) Hard coat film and method for producing the same
TWI243844B (en) Coating composition for protecting dazzling effect
TWI259295B (en) Polarizer protective film, polarizing plate, and visual display
US20060291055A1 (en) Diffuse Multilayer Optical Article
TWI515393B (en) White reflective film
CN1493006A (en) Cholesteric liquid crystal optical bodies and methods of manufacture
WO2006132912A1 (en) Reflective polarizer and display device having the same
CN1300606C (en) Substrate for protective film for polarizer
TWI509297B (en) Thin type polarizer and a display used thereof
EP1779150A2 (en) Laminated optical article
KR20090073148A (en) White polyester film for light reflective plate