TWI510826B - Light guide plate, light-emitting unit and liquid crystal display device having the same - Google Patents

Description

Light guide plate, light emitting unit, and liquid crystal display element having the same

The present invention relates to a light guide plate, a light emitting unit having the light guide plate, and a liquid crystal display element having the light emitting unit.

A liquid crystal display element widely used as a display device of a personal computer, a television, a portable telephone, or the like is not an illuminant itself, and therefore a surface light source called a backlight must be provided to illuminate light to display an image. In recent years, thin liquid crystal displays for use in notebook computers such as lightweight and miniaturized notebooks have been configured to have a light source at one end of the light guide plate and transmit the light to the far end via total reflection to form a side light type of the surface light source ( Side light) backlight, not used in the direct type backlight provided with a reflector in front of the light source.

In the above-mentioned edge-light type backlight, the pattern printed on the bottom surface of the light guide plate can destroy the total reflection of the light, generate irregular scattering and reflection, and guide the light to the front surface of the light guide plate. Japanese Laid-Open Patent Publication No. 2008-095103 discloses an ink for pattern formation comprising a polymer resin having an acrylic resin, a bridging agent having hexamethylene diisocyanate, and a filler. however, This material is easy to have the defects of the filament during printing, which leads to the problem that the subsequently obtained light guide plate has poor uniformity of brightness and is not accepted by the industry. This phenomenon is more serious on the large-sized light guide plate. Therefore, how to improve the coatability of the ink for pattern formation to obtain a light guide plate having excellent luminance uniformity has become an important subject in the art.

Therefore, an aspect of the present invention provides a light guide plate comprising a light incident surface of incident light, a light exiting surface of the outgoing light, and a bottom surface of the light guiding layer and having a light guiding layer, wherein the light guiding layer is After the ink composition for pattern formation is applied and dried, the dot pattern formed on the bottom surface of the light guide plate is formed. The ink composition for pattern formation described above contains an acrylate resin (A), a conjugated diene polymer (B), and a solvent (C). A light guide plate having excellent luminance uniformity can be obtained by using the pattern forming ink composition.

Another aspect of the present invention is to provide a light emitting unit including a light source and the light guide plate described above.

According to still another aspect of the present invention, a liquid crystal display element including the above-described light emitting unit and a liquid crystal panel disposed above a light emitting surface of the light guide plate is provided. The brightness uniformity of the liquid crystal display element can be improved by using the above-mentioned light guide plate.

The device structure and manufacturing method of the light guiding layer, the light guiding plate, the light emitting unit, and the liquid crystal display element of the present invention are described below.

Light guide

In the light guiding layer of the present invention, the ink composition for pattern forming is printed on the bottom surface of the light guide plate by inkjet printing, screen printing or imprinting, and dried to form a dot pattern. That is, the light guiding layer of the present invention is obtained.

The ink composition for pattern formation described above contains an acrylate resin (A), a conjugated diene polymer (B), and a solvent (C), which are described below.

Acrylate resin (A)

The acrylate-based resin (A) used in the ink composition for pattern formation of the present invention can be polymerized, for example, from the following ethylenically unsaturated monomer, and specific examples thereof include acrylic acid, methacrylic acid, crotonic acid, and α- Unsaturated carboxylic acid (anhydride) such as chloroacrylic acid, ethacrylic acid, cinnamic acid, maleic acid, maleic anhydride, fumaric acid, itaconic acid, itaconic anhydride, citraconic acid, citraconic anhydride, etc.; styrene , an aromatic vinyl compound such as α-methylstyrene, vinyl toluene, p-chlorostyrene, methoxystyrene, etc.; N-phenylmaleimide, N-o-hydroxyphenyl mala Imine, N-m-hydroxyphenylmaleimide, N-p-hydroxyphenylmaleimide, N-o-methylphenylmaleimide, N-m-methylbenzene Kamalyimide, N-p-methylphenylmaleimide, N-o-methoxyphenylmaleimide, N-m-methoxyphenylmaleimide , N-p-methoxyphenyl maleimide, N-cyclohexylmaleimide, and the like, maleic imines; methyl acrylate, methyl methacrylate, ethyl acrylate, methacrylic acid Ethyl ester, n-propyl acrylate N-propyl methacrylate, isopropyl acrylate, isopropyl methacrylate, n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, dibutyl acrylate, A Second butyl acrylate, third butyl acrylate, A Tert-butyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, 2-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 2-hydroxybutyl acrylate, 2-hydroxybutyl methacrylate, 3-hydroxybutyl acrylate, 3-hydroxybutyl methacrylate, acrylic acid-4- Hydroxybutyl ester, 4-hydroxybutyl methacrylate, allyl acrylate, allyl methacrylate, benzyl acrylate, benzyl methacrylate, phenyl acrylate, phenyl methacrylate, acrylic acid Methoxy triethylene glycol acrylate, methoxy triethylene glycol methacrylate, lauryl methacrylate, tetradecyl methacrylate Tertadecyl methacrylate, cetyl methacrylate, octadecylmethacrylate, eicosyl methacrylate, methacrylate Alkyl ester (docosyl methacry Late), etc., unsaturated carboxylic acid esters; 2-aminoethyl acrylate, 2-aminoethyl methacrylate, 2-aminopropyl acrylate, 2-aminopropyl methacrylate, acrylic acid-3 -Aminopropyl esters of unsaturated carboxylic acids such as aminopropyl acrylate and 3-aminopropyl methacrylate; unsaturated carboxylic acid glycidyl esters such as glycidyl acrylate and glycidyl methacrylate Vinyl esters of vinyl acetate, vinyl propionate, vinyl butyrate, etc.; vinyl methyl ether, vinyl ethyl ether, allyl epoxypropyl ether, methallyl epoxypropyl ether Equivalent ethers; cyanide vinyl compounds such as acrylonitrile, methacrylonitrile, α-chloroacrylonitrile, vinyl cyanide, etc.; acrylamide, methacrylamide, α-chloropropene An unsaturated decylamine such as guanamine, N-hydroxyethyl acrylamide or N-hydroxyethyl methacrylamide; an aliphatic conjugated diene such as 1,3-butadiene, isopropylene or chloropropene class. The above ethylenically unsaturated monomers may be used singly or in combination of plural kinds. Among them, acrylic acid, methacrylic acid, styrene, N-phenylmaleimide, methyl acrylate, methyl methacrylate, n-butyl acrylate, 2-hydroxyethyl acrylate, methacrylic acid-2 Hydroxyethyl ester, benzyl acrylate, benzyl methacrylate and the like are preferred.

The acrylate-based resin (A) of the present invention can uniformly mix ethylenically unsaturated monomers by using various conventional mixers or dispersers, and add 0.01% by weight to 3% by weight of a polymerization initiator to polymerize at normal temperature. Obtain and use organic solvents as needed.

The polymerization initiator used above is specifically, for example, a peroxide such as benzamidine peroxide, azobisisobutyronitrile [2,2'-azobis (isobutyronitrile); AIBN for short), azobisisovaleronitrile. An azo compound such as [2,2'-azobis(methylbutyronitrile); abbreviated as AMBN].

The organic solvent used above should be selected from those which are relatively easy to dissolve with other organic components, such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monoethyl ether, diethylene glycol. Mono-n-propyl ether, diethylene glycol mono-n-butyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl (poly)alkylene glycol singles such as ether, dipropylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, dipropylene glycol mono-n-butyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether Alkane ethers; ethylene glycol monomethyl ether acetate, ethylene glycol single (poly)alkylene glycol monoalkyl ether acetates such as ethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate; diethylene glycol dimethyl ether, diethylene glycol Other ethers such as alcohol methyl ethyl ether, diethylene glycol diethyl ether, tetrahydrofuran, etc.; ketones such as methyl ethyl ketone, cyclohexanone, 2-heptanone, 3-heptanone; methyl 2-hydroxypropionate , alkyl lactate such as ethyl 2-hydroxypropionate (ethyl lactate); methyl 2-hydroxy-2-methylpropionate, ethyl 2-hydroxy-2-methylpropionate, 3-methoxy Methyl propionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, ethyl ethoxyacetate, ethyl hydroxyacetate, 2-hydroxyl Methyl 3-methylbutanoate, 3-methyl-3-methoxybutyl acetate, 3-methyl-3-methoxybutylpropionate, ethyl acetate, n-propyl acetate, Isopropyl acetate, n-butyl acetate, isobutyl acetate, n-amyl acetate, isoamyl acetate, n-butyl propionate, ethyl butyrate, n-propyl butyrate, isopropyl butyrate, butyric acid N-butyl ester, methyl pyruvate, ethyl pyruvate, n-propyl pyruvate, methyl acetate methyl acetate, B Other esters such as ethyl acetate and ethyl 2-oxybutyrate; aromatic or aliphatic hydrocarbons such as toluene, xylene, hexane, cyclohexane, trimethylbenzene and diisopropylbenzene; N-A A carboxylic acid amine such as pyrrolidone, N,N-dimethylformamide or N,N-dimethylacetamide. The foregoing solvents may be used singly or in combination of plural kinds. Among them, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, diethylene glycol dimethyl ether, ethyl lactate, and ethyl 3-ethoxypropionate are preferred.

Conjugated diene polymer (B)

The conjugated diene polymer (B) of the present invention is obtained by copolymerizing a conjugated diene compound, wherein the conjugated diene compound may be butadiene, 2,3-dimethylbutadiene, or 1- Phenyl butadiene, 2-phenylbutadiene, 1,1-diphenyl butyl Alkene, 1,2-diphenylbutadiene, 2,3-diphenylbutadiene, 1,3-butadiene, isoprene, 2,3-diethyl-1,3-butyl Diene, 2-neopentyl-1,3-butadiene, 2-chloro-1,3-butadiene, 2-cyano-1,3-butadiene, 2,3-dimethyl- 1,3-butadiene, 2,4-dimethyl-1,3-butadiene, 2-trimethoxymethylidene-1,3-butadiene, 1,3-pentadiene, 2 a conjugated diene polymer such as methyl-1,3-pentadiene, 1,3-hexadiene, 4,5-diethyl-1,3-octadiene or chloroprene. Among them, 1,3-butadiene, isoprene, 1,3-pentadiene and the like are preferred. More preferably, 1,3-butadiene, isoprene or the like. The above conjugated diene polymer (B) may be used singly or in combination of plural kinds. The conjugated diene polymer (B) of the present invention is preferably a polybutadiene, a polyisoprene or a copolymer of isoprene and butadiene.

In the ink composition for pattern formation of the present invention, the conjugated diene polymer (B) is usually used in an amount of from 0.3 part by weight to 5 parts by weight, based on 100 parts by weight of the acrylate-based resin (A). 0.4 parts by weight to 4.5 parts by weight, more preferably 0.5 parts by weight to 4 parts by weight.

When the ink composition for pattern formation is applied, the conjugated diene polymer (B) can appropriately reduce the cohesive force of the ink to improve the defects of the filament, so that the dot pattern forms a smooth dot pattern, and further The printing quality of each point is made closer, so the brightness uniformity can be improved.

When the conjugated diene polymer (B) is not used in the ink composition for pattern formation of the present invention, the dot pattern formed by the ink composition for pattern formation tends to cause defects of the filament, and the light guide plate is uniform in luminance. The problem of poor sexuality, which in turn affects the performance of liquid crystal display elements.

The method for producing the conjugated diene polymer (B) described above is not particularly For example, the conjugated diene polymer (B) can be polymerized by an anionic polymerization method or a polymerization method using a Ziegler catalyst or the like. When an anionic polymerization method is used, the conjugated diene polymer (B) can be produced by the following method. The conjugated diene polymer (B) is polymerized in an inert gas atmosphere, for example, an inert gas such as argon or nitrogen, by adding a polymerization initiator to the solvent, wherein the solvent does not affect the progress of the polymerization, and the above The solvent may be a hydrocarbon solvent such as hexane, heptane, cyclohexylamine, benzene, toluene or xylene or an aromatic solvent, and the polymerization initiator may be a naphthalene sodium complex, a metal sodium or a metal base such as lithium metal. A metal, or an alkyllithium compound such as methyl lithium, ethyl lithium, pentyl lithium, n-butyl lithium or s-butyl lithium. The conjugated diene polymer (B) of the present invention may also be polymerized by using an azo compound or a peroxide as a polymerization initiator to generate a radical polymerization reaction, and the above azo compound may be azobis. Nitrile, and the peroxide may be benzammonium peroxide. The polymerization temperature of the above conjugated diene polymer (B) is usually from -100 ° C to 150 ° C, and the polymerization time is from 0.01 hour to 200 hours. The polymerization temperature and polymerization time are preferably -78 ° C to 100 ° C and 1 hour to 100 hours, respectively.

The conjugated diene polymer (B) of the present invention has a weight average molecular weight of 5,000 to 50,000, preferably 8,000 to 45,000, more preferably 10,000 to 40,000. When the weight average molecular weight of the conjugated diene polymer (B) is from 5,000 to 50,000, the ink composition for pattern formation can further improve the defects and luminance uniformity of the filament.

Solvent (C)

The type of the solvent (C) in the ink composition for pattern formation is not particularly limited, and may be selected from the group consisting of the above-mentioned acrylate resin (A). The solvent used is not described here. Among them, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, diethylene glycol dimethyl ether, ethyl lactate and ethyl 3-ethoxypropionate are also preferred. The solvent (C) may be used singly or in combination of plural kinds.

The amount of the solvent (C) used in the present invention is not particularly limited. The content of the solvent (C) is usually from 100 parts by weight to 1000 parts by weight, based on the acrylate resin (A), preferably from 150 parts by weight to 900 parts by weight, more preferably from 200 parts by weight to 800 parts by weight. Share.

Filling material (D)

The filler (D) of the present invention is an organic filler and/or an inorganic filler. Specific examples of the organic filler include epoxy resin, melamine resin, urea resin, acrylic resin, phenol resin, polyimide resin, polyamide resin, polyester resin, and Teflon resin. Specific examples of the inorganic filler are alumina, aluminum hydroxide, and cerium oxide (for example, commercially available from Catalyst Chemicals Co., Ltd. [trade name such as OSCAR 1132 (particle size 12 nm; dispersant is methanol), OSCAR 1332 ( Particle size 12nm; dispersant is n-propanol), OSCAR 105 (particle size 60nm; dispersant is γ-butyrolactone), OSCAR 106 (particle size 120nm; dispersant is diacetone alcohol), etc.]; Fuso Chemical Company Commercially available product [trade name such as Quartron PL-1-IPA (particle size 13 nm; dispersant is isopropanol), Quartron PL-1-TOL (particle size 13 nm; dispersant toluene), Quartron PL-2L -PGME (particle size 18 nm; dispersant is propylene glycol monomethyl ether), Quartron PL-2L-MEK (particle size 18 nm; dispersant is methyl ethyl ketone), etc.; commercially available from Nissan Chemical Co., Ltd. [trade name such as IPA -ST (particle size 12 nm; dispersant is isopropanol), EG-ST (particle size 12 nm; dispersant is Ethylene glycol, IPA-ST-L (particle size 45nm; dispersant is isopropanol), IPA-ST-ZL (particle size 100nm; dispersant is isopropanol), etc., magnesium oxide, magnesium hydroxide, Iron oxide, titanium dioxide, zinc oxide, tin oxide, tantalum nitride, aluminum nitride, talc [commercial product such as talc of trade name SG-2000 (average particle size 1 μm, made of Japanese talc)], mica, asbestos powder, quartz Powder, kaolin, bentonite, diatomaceous earth, zeolite, gypsum, glass beads, glass fiber, barium sulfate, magnesium sulfate, calcium carbonate, magnesium carbonate, calcium citrate, aluminum citrate, zirconium silicate, potassium titanate And fullerene and the like. The above fillers may be used singly or in combination of plural kinds.

The average particle diameter of the filler (D) of the present invention is not particularly limited, and is usually 10 μm or less. The content of the filler (D) is usually from 2 parts by weight to 70 parts by weight based on 100 parts by weight of the acrylic resin (A).

Additive (E)

The ink composition for pattern formation of the present invention may further optionally be added with an additive (E) such as a decane coupling agent, an antifoaming agent or a dispersing agent, or the like.

Specific examples of the above decane coupling agent include vinyl trichloromethane, vinyl triethoxy decane, vinyl tris( β -methoxy-ethoxy) decane, and β- (3,4-epoxycyclohexyl). Ethyltrimethoxydecane, 3-glycidoxypropyltrimethoxydecane, γ -glycidoxypropylmethyldiethoxydecane, γ- (methyl)acryloxypropyltrimethoxy Baseline, N-( β -aminoethyl) -γ -aminopropyltrimethoxydecane, N-( β -aminoethyl) -γ -aminopropyltrimethyldimethoxydecane, N-benzene yl - γ - aminopropyl trimethoxy Silane, γ - chloropropyl trimethoxy Silane, γ - thiol trimethoxy Silane, γ - aminopropyl trimethoxy Silane, 1,2-bis (Trimethoxydecyl)ethane, trade name SZ 6030 (manufactured by Dow Corning Toray Silicone) and trade names KBE-903, KBE-603, KBE-403 and KBM-403 (manufactured by Shin-Etsu Chemical Co., Ltd.).

Wherein the content of the decane coupling agent is usually from 0 part by weight to 30 parts by weight, preferably from 3 parts by weight to 25 parts by weight, more preferably from 5 parts by weight to 20 parts by weight based on 100 parts by weight of the acrylate-based resin (A). Share.

Specific examples of the above antifoaming agents are: Surfynol MD-20, Surfynol MD-30, Surfynol DF 110D, Surfynol 104E, Surfynol 420, Surfynol DF 37, Surfynol DF 58, Surfynol DF 66, Surfynol DF 70 and Surfynol DF 210 and EnviroGem AD01, EnviroGem AE01, EnviroGem AE02, etc. (made by Air Products). Wherein the content of the antifoaming agent is usually from 1 part by weight to 10 parts by weight, preferably from 2 parts by weight to 9 parts by weight, more preferably from 3 parts by weight to 8 parts by weight, based on 100 parts by weight of the acrylate-based resin (A). Share.

The above dispersing agent may, for example, be a polymer dispersant, a polyethoxyalkyl phosphate, a polyethoxyalkylamine, an alkanolamine, a pigment derivative or the like. Specific examples of the polymer dispersant include polyamine-amine (salt), polycarboxylic acid (salt), unsaturated molecular acid ester having high molecular weight, modified polyurethane, modified polyester, and modified A poly(meth)acrylate, a (meth)acrylic copolymer or a naphthalenesulfonic acid formaldehyde condensate. The polymer dispersant can be further classified into a linear polymer, a terminal modified polymer, a graft polymer, and a block polymer according to the structure.

Commercially available products can also be used as the dispersing agent of the present invention, and specific examples thereof are: trade names DISPERBYK-101, DISPERBYK-107, DISPERBYK-110, DISPERBYK-130, DISPERBYK-161, DISPERBYK-162, DISPERBYK-163, DISPERBYK-164, DISPERBYK-165, DISPERBYK-166, DISPERBYK-170, BYK-P104 and BYK-P105 (made by BYK Chemie); trade names EFKA 4047, EFKA 4010 to 4061, EFKA 4330 To 4340, EFKA 4400 to 4402, EFKA 5010, EFKA 6220, and EFKA 6745 (made by EFKA); trade names are AJISPER PB-821 and AJISPER PB-822 (made by Fine-Techno); trade names DISPARLON KS-860, DISPARLON KS-873N, DISPARLON 2150, DISPARLON 7004, etc. (products of Nanben Chemical); trade names DEMOL RN, DEMOL N, DEMOL MS, DEMOL C, DEMOL SN-B, HOMOGENOL L-18 and ACETAMIN 86 (made by Kao Corporation); SOLSPERSE 5000, SOLSPERSE 22000, SOLSPERSE 13240, SOLSPERSE 3000, SOLSPERSE 17000, SOLSPERSE 27000, SOLSPERSE 24000, SOLSPERSE 28000, SOLSPERSE 32000, SOLSPERSE 38500 (manufactured by Lubrizol), and trade name HINOACT T-8000E (manufactured by Kasei Fine Chemicals Co., Ltd.).

Among them, the above dispersing agents may be used singly or in combination of plural kinds.

Preparation of ink composition for pattern formation

The ink composition for pattern formation of the present invention is generally prepared by adding the above-mentioned acrylate-based resin (A), conjugated diene-based polymer (B), and solvent (C), and optionally, filler (D) and / or various additives (E), uniformly mixed in a conventional mixer or disperser, to obtain a pattern forming oil Ink composition.

Light guide

Please refer to FIG. 1 , which is a cross-sectional exploded view of a liquid crystal display device according to an embodiment of the invention. In an embodiment, the liquid crystal display element 100 includes at least a light guide plate 110, a light emitting unit 120, and a liquid crystal panel 150.

As shown in FIG. 1 , the light guide plate 110 of the present invention comprises a light incident surface 111 , a light exit surface 113 and a bottom surface 115 opposite to the light exit surface 113 . The light incident surface 111 is formed on the light guide plate 110 . The side surface 115 and the bottom surface 115 form an oblique angle with the light incident surface 111. Therefore, the light guide plate 110 is formed with a decreasing thickness from one end of the light incident surface 111 toward the opposite end, so that the light is uniformly emitted from the light exit surface 113.

The light guide plate 110 forms the above-mentioned dot pattern 117 on the bottom surface 115. The dot pattern 117 is not arranged or limited in size. The dot pattern 117 can generate light incident on the light guide plate 110 through the light incident surface 111. Scattering and reflection, that is, evenly diffusing light into various directions. The dot pattern 117 can be selected to form various shapes such as a circle, a quadrangle or a hexagon when printing, and the degree of light scattering and brightness of the dot pattern 117 vary depending on the material used in the ink.

Light unit

As shown in FIG. 1 , the light-emitting unit 120 of the present invention includes a light-emitting source 131 and the light guide plate 110 , wherein the light guide plate 110 and the light-emitting source The light incident surface 111 is opposite to the light source 131, and the light emitted from the light source 131 (not shown) enters the light guide plate 110 through the light incident surface 111, and the light guide plate 110 is taken by the light guide plate 110. The light source 131 is projected to the liquid crystal panel 150. The light source 131 includes a light source 133 and a light pipe reflector 135. The light source 133 can be a light source diode or a line of a point light source. a lamp of the light source type, the lamp reflector 135 is open in a direction adjacent to the light guide plate 110, and the light emitted by the light source 133 is directly reflected by the lamp reflector 135, and the reflector is reflected by the lamp tube. The opening of the 135 and the light incident surface 111 enter the light guide plate 110.

The light unit 120 further includes an optical group 140, wherein the optical group 140 includes a plurality of optical elements, such as a reflective sheet 141, a diffusion sheet 143, a slab 145, and the like, wherein the reflective sheet 141 and the light guide plate 110 The bottom surface 115 is adjacent to the light-emitting surface 110, and the light-emitting surface 143 is incident on the light-guide plate 110. The light emitted through the light guide plate 110 and emitted through the light-emitting surface 113 can be uniformly diffused. The slab 145 is adjacent to the diffusion sheet 143, and the slab 145 can agglomerate light to increase the front of the light projected onto the liquid crystal panel 150. brightness.

Liquid crystal display element

Please refer to FIG. 2, which is a perspective exploded view of a liquid crystal display device according to an embodiment of the invention. The liquid crystal display element 200 of the present invention includes at least the above-described light emitting unit 210, liquid crystal panel 220, top chassis 230, and bottom chassis 240.

The liquid crystal panel 220 may include a thin film transistor (TFT) substrate 221 (hereinafter simply referred to as a TFT substrate), a color filter (CF) substrate 223, and a liquid crystal containing liquid crystal layer (not shown). This shows the external image.

Next, the printed circuit board 225 is provided with a driving chip (not shown) and connected to the TFT substrate 221 through a tape carrier package 227. The various signals required for displaying the external image can be transmitted to the TFT substrate 221 through the printed circuit board 225 and the driving chip (not shown).

Additionally, the aforementioned top chassis 230 can be coupled to the bottom chassis 240. The upper portion of the bottom chassis 240 defines an open storage space. The portion of the bottom chassis 240 around the storage space can support the liquid crystal panel 220, and the storage space can accommodate the light-emitting unit 210. The light provided by the above-mentioned light emitting unit 210 can pass through the liquid crystal panel 220 to display an external image.

The top chassis 230 described above covers and fixes the outer edge of the liquid crystal panel 220 to prevent the printed circuit board 225 from being exposed to the outside. An opening is formed in the middle of the top chassis 230 to expose the image display area of the liquid crystal panel 220 through the opening.

It is to be noted that FIGS. 1 and 2 are for illustrative purposes, and the present invention is not limited thereto. Therefore, the light-emitting unit of the present invention can also be applied to other types of display devices; the liquid crystal display device of the present invention can also use other types of optical elements, such as polarizers and the like.

The following embodiments are used to illustrate the application of the present invention, but are not intended to limit the present invention, and have general knowledge in the technical field of the present invention. Various changes and modifications can be made without departing from the spirit and scope of the invention.

100‧‧‧Liquid display components

110‧‧‧Light guide plate

111‧‧‧Into the glossy surface

113‧‧‧Glossy

115‧‧‧ bottom

117‧‧‧ dot pattern

120‧‧‧Lighting unit

131‧‧‧Light source

133‧‧‧Light source

135‧‧‧light tube reflector

140‧‧‧Optics

141‧‧‧reflector

143‧‧‧Diffuser

145‧‧‧ Picture

150‧‧‧LCD panel

200‧‧‧Liquid display components

210‧‧‧Lighting unit

220‧‧‧LCD panel

221‧‧‧Film Optoelectronic Substrate

223‧‧‧Color filter substrate

225‧‧‧Printed circuit board

227‧‧‧Reel tape bearing package

230‧‧‧Top chassis

240‧‧‧ bottom chassis

300‧‧‧Light guide plate

301‧‧‧ border

302‧‧‧ border

303‧‧‧ border

304‧‧‧ border

310‧‧‧Light source

A ₁ to A ₉ ‧ ‧ measuring points

1 is a cross-sectional, exploded view of a liquid crystal display device in accordance with an embodiment of the present invention.

2 is a perspective exploded view of a liquid crystal display element according to an embodiment of the present invention.

Fig. 3 is a top plan view showing the evaluation method of luminance uniformity according to an embodiment of the present invention.

Preparation of acrylate resin (A)

The acrylate resin (A) of Synthesis Examples A-1 to A-6 was prepared according to the first table.

Synthesis Example A-1

14 parts by weight of 2-hydroxyethyl methacrylate (hereinafter referred to as HEMA), 40 parts by weight of methyl methacrylate (hereinafter referred to as MMA), and 20 parts by weight of acrylic acid N-butyl acrylate (n-BA), 25 parts by weight of styrene (hereinafter referred to as SM) and 1 part by weight of azobisamyl (2,2'-azobis ( Methylbutyronitrile), hereinafter referred to as AMBN), The star-shaped stirring device (model: ARB-310; manufactured by THINKY) was uniformly stirred, and subjected to thermal polymerization at 80 ° C. After 12 hours of reaction, an acrylate-based resin (A-1) was obtained.

Synthesis Examples A-2 to A-6

The method for preparing the acrylate-based resin (A) of Synthesis Example A-1 differs in that the synthesis examples A-2 to A-6 change the kind and amount of the raw material in the acrylate-based resin (A), as in the first The table shows.

Preparation of conjugated diene polymer (B)

The conjugated diene polymer (B) of Synthesis Examples B-1 to B-5 was prepared according to the second table below.

Synthesis Example B-1

The internal gas of a 5 liter autoclave was replaced with nitrogen, and 300 parts by weight of hexane and 1.5 parts by weight of n-butyllithium were added, and the temperature was raised to 40 °C. Thereafter, 100 parts by weight of 1,3-butadiene (hereinafter referred to as BD) was added, and after reacting for 1 hour, a part of the reaction liquid was sampled, and the product was analyzed by GPC to obtain a total of The conjugated diene polymer (B-1) has a weight average molecular weight of 4,000 in terms of polystyrene, and the conjugated diene polymer (B-1) has a weight average molecular weight of 4,000.

Synthesis Examples B-2 to B-5

The method for producing the conjugated diene polymer (B) of Synthesis Example B-1 differs in that the synthesis examples B-2 to B-5 change the kind of the composition in the conjugated diene polymer (B). The formulation and the weight average molecular weight are shown in Table 2, and the amounts thereof and reaction conditions are not described here.

Preparation of ink composition for pattern formation

The ink compositions for pattern formation of Examples 1 to 6 and Comparative Examples 1 to 3 were prepared according to Table 3 below.

Example 1

100 parts by weight of the acrylate resin (A-1), 0.3 parts by weight of a polymer of 1,3-butadiene (polybutadiene; hereinafter abbreviated as B-1), and 100 parts by weight of diethylene glycol dimethyl Diethyleneglycol dimethyl ether (hereinafter referred to as C-1), which is uniformly stirred by a star-shaped stirring device, and then mixed with a three-roller machine (model FC-90mm, manufactured by Fansui Co., Ltd.) for 3 hours to obtain a pattern. The ink composition is formed. The obtained ink composition for pattern formation was evaluated by the following evaluation methods. The results are shown in Table 3, and the method for detecting coatability and luminance uniformity will be described later.

Examples 2 to 6 and Comparative Examples 1 to 3

In Examples 2 to 6 and Comparative Examples 1 to 3, the same production method as that of the ink composition for pattern formation of Example 1 was used, except that Examples 2 to 6 and Comparative Examples 1 to 3 were changed in pattern. The type and amount of the raw material in the ink composition for formation are shown in Table 3, and are not described here.

Evaluation method Coating property

Using a screen printing machine (model PA3-F34, Miaoyinjing mechanism), the pattern forming ink composition was printed on a 32-inch light guide plate (material was transparent PMMA resin, thickness: 3 mm), and printed on a 300 mm ² dot. (I) Calculate the dimensional error of dot printing and evaluate it according to the following benchmarks:

◎: The dot printing is complete, and the number of dots having a dimensional error greater than 20% is less than 1%.

○: The dot printing is complete, and the number of dots having a dimensional error greater than 20% accounts for 1% to 5%.

△: The dot printing is complete, and the number of dots having a dimensional error greater than 20% is higher than 5%.

×: The phenomenon of filaments appearing in the ink causes the dot printing to be incomplete.

2. Brightness uniformity

Please refer to FIG. 3, which is a top view showing the evaluation method of luminance uniformity according to an embodiment of the present invention. First, using the screen printing machine (model PA3-F34; Miaozhenjing mechanism), the ink composition for pattern formation of Examples 1 to 6 and Comparative Examples 1 to 3 was applied to the light guide plate 300 of 32 Å (the material was transparent). On the PMMA resin; the thickness is 3 mm), the dots of 300 mm ² , 400 mm ² , 500 mm ² , 600 mm ² , 700 mm ² , 800 mm ² and 900 mm ² are sequentially printed from the light source end, as shown in FIG. 3 . Next, the light guide plate 300 on which the ink composition for pattern formation was printed was dried at 70 ° C for 30 minutes, and then the light guide plate 300 was irradiated with the LED 9000K light source 310 for one hour. Thereafter, the luminance is measured by a luminance meter (model: BM-7A; manufactured by Topcon), and the measurement points (A ₁ to A ₉ ) are also shown in FIG. 3, wherein A ₁ , A ₂ and A ₈ and the light guide plate 300 The distance of the boundary 301, the distance between A ₂ to A ₄ and the boundary 304 of the light guide plate 300, the distance between A ₄ to A ₆ and the boundary 303 of the light guide plate 300, and the distance between A ₆ to A ₈ and the boundary 302 of the light guide plate 300 Both are 20mm. The ratio of the minimum value to the maximum value of the 9 points is the luminance uniformity, and is evaluated according to the following criteria: ◎: 78% < luminance uniformity.

○: 75% ≦ luminance uniformity ≦ 78%.

×: luminance uniformity <75%.

As is clear from the results of the third table, when the conjugated diene polymer (B) is used as the ink composition for pattern formation, the light guide plate obtained has better coatability and luminance uniformity. Further, when the weight average molecular weight of the conjugated diene polymer (B) is from 5,000 to 50,000, the obtained light guide plate has better coatability and luminance uniformity, so that the object of the present invention can be achieved. .

Next, in Comparative Examples 1 and 2, when the conjugated diene polymer (B) was not used in the ink composition for pattern formation, the coating property and luminance uniformity of the obtained light guide plate were not good. In the comparative example 3, when the conjugated diene polymer (B) is not used in the ink composition for pattern formation, the acrylate resin (A) is synthesized using the monomer of the conjugated diene polymer (B). At the same time, the coating property and the uniformity of luminance of the light guide plate produced were also poor.

It should be noted that the present invention describes a light guide plate, a light-emitting unit, and a liquid crystal display element having the same according to a specific compound, composition, reaction condition, process, analysis method or specific instrument, but the present invention It is to be understood by those skilled in the art that the present invention is not limited thereto, and without departing from the spirit and scope of the invention, The light guide plate, the light-emitting unit, and the liquid crystal display element having the light-emitting unit of the invention can also be carried out using other compounds, compositions, reaction conditions, processes, analytical methods, or instruments.

The present invention has been disclosed in the above embodiments, and is not intended to limit the present invention. Any one of ordinary skill in the art to which the present invention pertains can make various changes without departing from the spirit and scope of the invention. The scope of protection of the present invention is therefore defined by the scope of the appended claims.

Claims (9)

A light guide plate comprising: a light incident surface of an incident light; a light exiting surface of the outgoing light; and a bottom surface, wherein the bottom surface is opposite to the light emitting surface, and the bottom surface has a light guiding layer, and wherein the light guiding layer And a dot pattern formed on the bottom surface by applying and drying a pattern forming ink composition, wherein the pattern forming ink composition comprises: an acrylate resin (A); a conjugated diene polymerization (B); and a solvent (C). The light guide plate of claim 1, wherein the conjugated diene polymer (B) has a weight average molecular weight of 5,000 to 50,000. The light guide plate according to claim 1, wherein the conjugated diene polymer (B) is used in an amount of from 0.3 to 5 parts by weight based on 100 parts by weight of the acrylate resin (A), and The solvent (C) is used in an amount of from 100 to 1000 parts by weight. A light emitting unit includes: a light emitting source; and a light guide plate, wherein the light guide plate is combined with the light source, and the light guide One of the bottom surfaces of the plate has a light guiding layer, and the light guiding layer is formed on the bottom dot pattern by using a pattern forming ink composition after being coated and dried, wherein the pattern forming ink composition The invention comprises: an acrylate resin (A); a conjugated diene polymer (B); and a solvent (C). The light-emitting unit of claim 4, wherein the conjugated diene polymer (B) has a weight average molecular weight of 5,000 to 50,000. The light-emitting unit according to claim 4, wherein the conjugated diene polymer (B) is used in an amount of from 0.3 to 5 parts by weight based on 100 parts by weight of the acrylate-based resin (A), and The solvent (C) is used in an amount of from 100 to 1000 parts by weight. A liquid crystal display element comprising: a light source; a light guide plate, wherein the light guide plate is combined with the light source, and a light guide layer has a light guide layer on a bottom surface thereof; and a liquid crystal panel disposed on the light guide plate Above the light-emitting surface, wherein the light-guiding layer is formed on the bottom dot pattern by using a pattern forming ink composition after being coated and dried, wherein the pattern forming ink composition comprises: An acrylate resin (A); a conjugated diene polymer (B); and a solvent (C). The liquid crystal display element according to claim 7, wherein the conjugated diene polymer (B) has a weight average molecular weight of 5,000 to 50,000. The liquid crystal display element according to claim 7, wherein the conjugated diene polymer (B) is used in an amount of from 0.3 to 5 parts by weight based on 100 parts by weight of the acrylate resin (A). And the solvent (C) is used in an amount of 100 to 1000 parts by weight.