CN101776820A - Light diffusion plate for straight-down-type backlight LCD - Google Patents
Light diffusion plate for straight-down-type backlight LCD Download PDFInfo
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- CN101776820A CN101776820A CN200910181618A CN200910181618A CN101776820A CN 101776820 A CN101776820 A CN 101776820A CN 200910181618 A CN200910181618 A CN 200910181618A CN 200910181618 A CN200910181618 A CN 200910181618A CN 101776820 A CN101776820 A CN 101776820A
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Abstract
The invention relates to a light diffusion plate for a straight-down-type backlight LCD, comprising a first layer plate, a second layer plate and a third layer plate, wherein the first layer plate comprises first class resin, light dispersing agent and ultraviolet absorber; the second layer plate comprises the first class resin, second class resin and the light dispersing agent; the third layer plate comprises the second class resin, the light dispersing agent and the ultraviolet absorber; and the coefficient of thermal expansion of the second class resin is more than that of the first class resin. The light diffusion plate is a multi-layer plate made of two resins with different coefficients of thermal expansion; and under the influence of the heat and the like of a light source, the light diffusion plate has warpage due to the interior stress generated by the different coefficients of thermal expansion at the layers, and the light diffusion plate is convex towards the direction of the backlight source.
Description
Technical field
The present invention relates to a kind of light diffusing sheet, relate in particular to a kind of light diffusion plate for straight-down-type backlight LCD.
Background technology
Along with Staight downward type backlight mode in LCD or the LCD TV becomes main flow, increase day by day as the light diffusing sheet demand of a back light inscape part.In recent years, towards the The Enlargement Tendency development, size reaches 40 inches～64 inches for LCD or LCD TV, and the area of the light diffusing sheet of Shi Yonging also increases thereupon simultaneously.Because the influence of light source heat etc. can cause the warpage variation of light diffusing sheet more obvious, is easy to contact with other blooming pieces and the liquid crystal panel that are configured in light diffusing sheet top, makes that observed display brightness is inhomogeneous.Therefore, be badly in need of a kind of under heating condition dimensional stability good, and the little light diffusing sheet of warpage.
In order to reach above-mentioned purpose, the polystyrene resin that uses low water absorption is arranged, the use polycarbonate resin is arranged, the multipolymer that uses styrene and acrylic resin is also arranged, perhaps use the main composition composition of the composition of above-mentioned resin, and reach the purpose of making the little light diffusing sheet of warpage as the formation light diffusing sheet.
But, be that the employing resin is under the prerequisite of raw material substantially at present light diffusing sheet, the unstable performance of size is the inherent characteristic of resin.Along with the slimming of LCD, LCD TV, there is the tendency of minimizing in the gap of light diffusing sheet and light source or liquid crystal panel simultaneously, even make that the little light diffusing sheet of warpage still can't meet the demands.Therefore, in order to address the above problem, be provided with the warpage that projection is used for preventing light diffusing sheet in Staight downward type backlight device inside.
Because the warp direction of diffuser plate can't be accomplished unanimity, diffuser plate has protruding possibility to the liquid crystal panel direction, because the diffuser plate warpage is expressed to the brightness homogeneity that liquid crystal panel can have influence on light source yet even so.In addition, described projection is provided with the state of adjacency light diffusing sheet, and the vibration when LCD TV run-off the straight or transportation all can make projection contact with light diffusing sheet, thereby can cause the light diffusing sheet surface to produce the problem that scratches.
The material of common described projection is made by polystyrene resins, polycarbonate resin or olefine kind resin.When the composition of light diffusing sheet is acrylic resin, because therefore the hardness height of acrylic resin can not produce scuffing on the light diffusing sheet surface.But the material of light diffusing sheet uses soft resin such as styrene resin or polycarbonate resin gradually at present, so this class light diffusing sheet just requires scratch resistance.
In order to improve scratch resistance, carried out the processing of solidified coating on the surface of resin plate, still, branch plate cost after treatment uprises, and is not suitable for use in the large-scale LCD TV that the total cost that requires each member descends.
Therefore, even a kind of warpage that takes place under heating condition of demand can be protruding light diffusing sheet to the back light direction by its bending direction of design code also.
In order to solve the above problems, improve from the production technology aspect, make light diffusing sheet when producing, just have 1 millimeter～5 millimeters warpage, in the time of in being mounted to the LCD backlight module, the one side of protrusion is installed towards light source direction.But, because the angularity of such light diffusing sheet can't very accurate control, and owing to itself with regard to have warpage be easier to module backlight in construction package such as projection rub, cause light diffusing sheet to be scratched, and then influence the brightness homogeneity of back light.
Summary of the invention
The present invention is directed to prior art light diffusion plate for straight-down-type backlight LCD above shortcomings, a kind of light diffusion plate for straight-down-type backlight LCD is provided, even warpage takes place under heating condition, can stipulate that also its bending direction is protruding in the back light direction, partly contacting between other assemblies with backlight of can preventing from simultaneously to cause owing to warpage produces scuffing, do not have the light diffusing sheet of brightness disproportionation.
The technical scheme that the present invention solves the problems of the technologies described above is as follows: a kind of light diffusion plate for straight-down-type backlight LCD comprises first laminate, second laminate and three ply board, and described second laminate is arranged between described first laminate and the three ply board; Described first laminate comprises the first kind resin of 100 mass parts, the light diffusing agent of 0.5 mass parts～5 mass parts and the ultraviolet light absorber of 0.01 mass parts～10 mass parts; Described second laminate comprises the first kind resin of 100 mass parts and the light diffusing agent of second resinoid and 0.5 mass parts～5 mass parts; Described three ply board comprises second resinoid of 100 mass parts, the light diffusing agent of 0.5 mass parts～5 mass parts and the ultraviolet light absorber of 0.01 mass parts～10 mass parts; The described second resinoid thermal expansivity is greater than the described first resinoid thermal expansivity.
The invention has the beneficial effects as follows: light diffusing sheet of the present invention is the multilayer board that is made by two kinds of different resins of thermal expansivity, wherein this multiple-plate skin is made of the low thermal coefficient of expansion resin, internal layer is made of the high thermal expansion coefficient resin, the middle layer is made of with the resin combination that certain proportion mixes these two kinds of resins, and with by skin to the internal layer direction, thermal expansivity forms by ascending mode is laminated.Because under the influence of the heat of light source etc.,, can stipulate that it protrudes to high thermal expansion coefficient layer direction, the light source direction that promptly supports or opposes protrusion when light diffusing sheet because the internal stress that the difference of each layer thermal expansivity produces makes when this kind light diffusing sheet produces warpage.Described light diffusing sheet demonstrates good light diffusing and light fastness simultaneously.
Described second laminate is a single layer structure, and first kind resin and the mixed thermal expansivity of second resinoid are greater than the described first resinoid thermal expansivity, and less than the described second resinoid thermal expansivity in described second laminate.
Further, described second laminate is to comprise two-layer at least sandwich construction, every layer in the described sandwich construction includes first kind resin, second resinoid and light diffusing agent, the first kind resin and the second resinoid weight ratio reduce on the direction of three ply board gradually along described first laminate in described each layer, and first kind resin and the mixed thermal expansivity of second resinoid increase on the direction of three ply board gradually along described first laminate in described each layer.
Further, the described first resinoid thermal expansivity is 5 * 10
-5M/m ℃～8 * 10
-5M/m ℃, the described second resinoid thermal expansivity is 10 * 10
-5M/m ℃～13 * 10
-5M/m ℃.
Further, described first kind resin comprises one or more in polystyrene, polychlorostyrene, poly-halogenated styrenes class, polyvinyl toluene and the polyoxyethylene alkylphenyl vinyl resins.
Further, described second resinoid comprises one or more in polymethylmethacrylate, polyethyl methacrylate, poly-n-butyl methacrylate, polycyclohexyl methacrylate, polymethylacrylic acid octadecane ester, polymethacrylate, polymethyl acrylate, polyethyl acrylate, butyl polyacrylate, polyacrylic acid cyclohexyl, polyacrylic acid phenyl ester, polypropylene acid benzyl ester and the polyacrylate resinoid.
Further, described light diffusing agent exists with atomic form, comprises in type siloxane polymer particle, acrylic polymers particle, calcium carbonate particle, barium sulphate particle, Titanium particles, silicon oxide particle, talcum particle, white carbon particle, mica particle, glass particle, aluminum hydroxide particles, magnesia particle, zinc paste particle and the polystyrene resins particle one or more.
Further, described ultraviolet light absorber comprises that benzophenone series ultraviolet light absorber, triazine are that ultraviolet light absorber, benzotriazole are that ultraviolet light absorber and cyclic imide base ester are one or more in the ultraviolet light absorber.
Further, when described light diffusing sheet is installed on the direct down type backlight LCD, the front side of described light diffusing sheet be described first laminate towards the liquid crystal panel setting, the back side of described light diffusing sheet is that described three ply board is towards the back light setting.
Further, the thickness of described light diffusing sheet is 0.3 millimeter～4 millimeters.
Description of drawings
Fig. 1 is the structural representation of light diffusion plate for straight-down-type backlight LCD first embodiment of the present invention;
Fig. 2 is the structural representation of light diffusion plate for straight-down-type backlight LCD second embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing principle of the present invention and feature are described, institute gives an actual example and only is used to explain the present invention, is not to be used to limit scope of the present invention.
Fig. 1 is the structural representation of light diffusion plate for straight-down-type backlight LCD first embodiment of the present invention.As shown in Figure 1, described light diffusing sheet comprises first laminate 101, second laminate 102 and the three ply board 103, and described second laminate 102 is arranged between described first laminate 101 and the three ply board 103.Described first laminate 101 comprises the first kind resin of 100 mass parts, the light diffusing agent of 0.5 mass parts～5 mass parts and the ultraviolet light absorber of 0.01 mass parts～10 mass parts.Described second laminate 102 comprises the first kind resin of 100 mass parts and the light diffusing agent of second resinoid and 0.5 mass parts～5 mass parts.Described three ply board 103 comprises second resinoid of 100 mass parts, the light diffusing agent of 0.5 mass parts～5 mass parts and the ultraviolet light absorber of 0.01 mass parts～10 mass parts, and the described second resinoid thermal expansivity is greater than the described first resinoid thermal expansivity.The thickness of described light diffusing sheet is 0.3 millimeter～4 millimeters.
In described first laminate 101 with main body composition in its prescription promptly the first resinoid addition be benchmark (100 mass parts), other compositions are that light diffusing agent and ultraviolet light absorber are object of reference with the first resinoid content in the prescription, represent with its number percent that accounts for first kind resin quality, be respectively the light diffusing agent of 0.5 mass parts～5 mass parts and the ultraviolet light absorber of 0.01 mass parts～10 mass parts.
In described second laminate 102 with its prescription in the main body composition be that first kind resin and second resinoid total addition are benchmark (100 mass parts), other compositions are that light diffusing agent is an object of reference with the first kind resin and the second resinoid total content in the prescription, represent with its number percent that accounts for the first kind resin and the second resinoid gross mass, be respectively the light diffusing agent of 0.5 mass parts～5 mass parts.In described second laminate 102, the described first kind resin and second resinoid can mix by arbitrary proportion, as long as guarantee all to contain, preferably, the described first kind resin and the second resinoid mass ratio are 1: 4～4: 1.
In the described three ply board 103 with main body composition in its prescription promptly the second resinoid addition be benchmark (100 mass parts), other compositions are that light diffusing agent and ultraviolet light absorber are object of reference with the second resinoid content in the prescription, represent with its number percent that accounts for the second resinoid quality, be respectively the light diffusing agent of 0.5 mass parts～5 mass parts and the ultraviolet light absorber of 0.01 mass parts～10 mass parts.
The described first resinoid thermal expansivity is 5 * 10
-5M/m ℃～8 * 10
-5M/m ℃, described first kind resin comprises one or more in polystyrene, polychlorostyrene, poly-halogenated styrenes class, polyvinyl toluene and the polyoxyethylene alkylphenyl vinyl resins.
The described second resinoid thermal expansivity is 10 * 10-5m/m ℃～13 * 10-5m/m ℃, and described second resinoid comprises one or more in polymethylmethacrylate, polyethyl methacrylate, poly-n-butyl methacrylate, polycyclohexyl methacrylate, polymethylacrylic acid octadecane ester, polymethacrylate, polymethyl acrylate, polyethyl acrylate, butyl polyacrylate, polyacrylic acid cyclohexyl, polyacrylic acid phenyl ester, polypropylene acid benzyl ester and the polyacrylate resinoid.
Thermal expansivity in the present embodiment is meant according to ASTM D-696 measures the value that gets.For to obtain good effect, the difference of the thermal expansivity of described first laminate 101 and three ply board 103 is preferably 1 * 10 in the present embodiment
-5M/m ℃ or higher, more preferably 3 * 10
-5M/m ℃ or higher.In addition, from preventing to differ because of coefficient of thermal expansion the aspect consideration of this lamination structure generation slight crack that causes described light diffusing sheet too greatly, the coefficient of thermal expansion differences of described first laminate 101 and three ply board 103 is preferably 10 * 10
-5M/m ℃ or lower.
In order to satisfy the requirement of light diffusion, need in the resin of each laminate of described light diffusing sheet, add a certain amount of light diffusing agent, can increase the light diffusing of light diffusing sheet inside.As light diffusing agent, can use known particulate, be preferably partial cross-linked type siloxane polymer particle, acrylic polymers particle or the lime carbonate of 1 micron～10 microns of particle diameters.These diffusants can only use a kind of, also can use multiple.In addition, as other diffusant, can also and with inorganic fine particles such as barium sulphate, titanium dioxide, monox, talcum, white carbon, mica, glass, aluminium hydroxide, magnesium oxide, zinc paste and to these inorganic particulates apply surface treatment with fatty acid etc. and must material, the organic filler crosslinked or the high molecular weight styrene resin particle is such, but the above-mentioned preferred not enough light diffusing agent general assembly (TW) of diffusant as other 50%.
In addition, be provided with concavo-convexly by the surface that comprises first laminate 101 and three ply board 103 at described light diffusing sheet, then can give the exterior light diffusivity, and can reduce the consumption of light diffusing agent, also can increase the transmittance of light diffusing sheet.Simultaneously, the setting of concave-convex surface also can have good scratch resistance performance.Three ply board 103 mainly is to be the resin formation of principal ingredient with the polymethylacrylic acid in the light diffusing sheet in the present embodiment, has therefore well solved with projection and has produced friction and the problem of generation scuffing.
Owing to the effects such as resin variation, brightness reduction and color and luster variation that can cause light diffusing sheet from the light of back light, in order to improve photostability so preferably in described first laminate 101 and three ply board 103, mixing ultraviolet light absorber.Described ultraviolet light absorber comprises that benzophenone series ultraviolet light absorber, triazine are that ultraviolet light absorber, benzotriazole are that ultraviolet light absorber and cyclic imide base ester are one or more in the ultraviolet light absorber.
Described benzophenone series ultraviolet light absorber comprises 2; the 4-dihydroxy benaophenonel; 2-hydroxyl-4-methoxy benzophenone; 2-hydroxyl-4-octyloxy benzophenone; 2-hydroxyl-4-benzyloxy benzophenone; 2-hydroxyl-4-methoxyl-5-sulfonic acid benzophenone; 2-hydroxyl-4-methoxyl-5-sulfonic acid Trihydride benzophenone; 2; 2 '-dihydroxy-4-methoxyl benzophenone; 2; 2 '; 4; 4 '-tetrahydroxybenzophenone; 2; 2 '-dihydroxy-4; 4 '-dimethoxy-benzophenone; 2; 2 '-dihydroxy-4,4 '-dimethoxy-benzophenone-5-sodium sulfonate; two (5-benzoyl-4-hydroxyl-2-methoxyphenyl) methane; in 2-hydroxyl-4-dodecyl benzophenone and 2-hydroxyl-4-methoxyl-the 2 '-carboxyl benzophenone one or more.
Described triazine is that ultraviolet light absorber is 2-(4,6-diphenyl-1,3,5-triazines-2-the yl)-own oxygen base of 5-phenol.
Described benzotriazole is that ultraviolet light absorber comprises 2-(2-hydroxy-5-methyl base phenyl) benzotriazole; 2-(2-hydroxyl-uncle's 5-octyl phenyl) benzotriazole; 2-(2-hydroxyl-3; 5-two picryl phenyl) phenyl benzotriazole; 2-(the 2-hydroxyl-3-tert-butyl group-5-aminomethyl phenyl)-5-chlorobenzotriazole; 2; [4-(1 for 2 '-di-2-ethylhexylphosphine oxide; 1; 3; the 3-tetramethyl butyl)-6-(2H-benzotriazole-2-yl) phenol]; 2-(2-hydroxyl-3; the 5-di-tert-butyl-phenyl) benzotriazole; 2-(2-hydroxyl-3; the 5-di-tert-butyl-phenyl)-5-chlorobenzene third triazole; 2-(2-hydroxyl-3; the 5-di-tert-pentyl-phenyl) benzotriazole; 2-(2-hydroxyl-uncle's 5-octyl phenyl) benzotriazole; 2-(2-hydroxyl-5-tert-butyl-phenyl) benzotriazole; 2-(2-hydroxyl-4-octyloxyphenyl) benzotriazole; 2; 2 '-di-2-ethylhexylphosphine oxide (4-picryl-6-benzotriazole base phenyl); 2; 2 '-TOPOT 2,2 (1; 3-benzoxazine-4-ketone) and 2-[2-hydroxyl-3-(3; 4; 5,6-tetrahydrobenzene diformyl methyl)-and the 5-aminomethyl phenyl] in the benzotriazole one or more.
Described cyclic imide base ester is that ultraviolet light absorber comprises 2,2 '-TOPOT 2,2 (3,1-benzoxazine-4-ketone), 2,2 '-(4,4 '-diphenylene) two (3,1-benzoxazine-4-ketone) and 2, in 2 '-(2, the 6-naphthylene) two (3,1-benzoxazine-4-ketone) one or more.
When described light diffusing sheet is installed on the direct down type backlight LCD, the front side of described light diffusing sheet be described first laminate 101 towards the liquid crystal panel setting, the back side of described light diffusing sheet is that described three ply board 103 is towards the back light setting.
Fig. 2 is the structural representation of light diffusion plate for straight-down-type backlight LCD second embodiment of the present invention.As shown in Figure 2, be with Fig. 1 difference, described second laminate 102 comprise B1 layer, B2 layer ... the Bn layer, wherein, n 〉=2.Every layer in the described sandwich construction includes first kind resin, second resinoid and light diffusing agent, described B1 layer, B2 layer ... in the Bn layer first kind resin and the second resinoid weight ratio be respectively x1, x2 ... xn, wherein, x1＞x2 ...＞xn＞0, and n 〉=2.Described B1 layer, B2 layer ... in the Bn layer first kind resin mix with second resinoid back thermal expansivity be respectively b1, b2 ... bn, b1＜b2 ...＜bn, wherein, n 〉=2, b1 is greater than the described first resinoid thermal expansivity, and bn is less than the described second resinoid thermal expansivity.Lamination order on the direction of described light diffusing sheet along liquid crystal panel towards back light be followed successively by first laminate 101, B1 layer, B2 layer ... Bn layer, three ply board 103.
The method for making of described light diffusing sheet can be the method for knowing altogether, and for example then method, solvent are followed method, method, cast polymerization method and surface coated method or the like are followed in polymerization for co-extrusion modling method, applying method, heating.
Light diffusing sheet of the present invention preferably passes through many extruder co-extrusion modlings of employing.After the resin of each laminate is weighed according to a certain ratio, by extruder fully mixing under molten condition separately, enter runner separately and in die head, converge, laminated for the molten resin plate after the one re-uses the roller set cooling curing, promptly finish this multilayer composite sheet.Use this method can make this multilayer board once-forming, avoided the compound production process of multiple tracks, consume to reduce to produce.In addition, owing to be that once-forming directly is composited, therefore layer is also more firm with combining of layer, and being difficult for influences use because of internal stress generation tomography and crack.
The light diffusing sheet that obtains thus is the tabular of 0.3 millimeter～4 millimeters of thickness with resin combination by extrusion molding.By directly its size that cuts into appointment being made light diffusing sheet of the present invention.The preferred thickness of described light diffusing sheet is 0.5 millimeter～3 millimeters, when 0.5 millimeter of thickness less than, is difficult to guarantee as the intensity of backlight with diffuser plate; When thickness surpasses 3 millimeters,, therefore be difficult to corresponding with maximization, slimming because diffuser plate weight becomes big.Wherein, described light diffusing sheet more preferably thickness be 1.0 millimeters～2.5 millimeters.
With eight embodiment and three comparative examples light diffusing sheet of the present invention is described in further detail below, described light diffusing sheet is by the be shaped laminated resin plate of 3 layers of formation obtaining of above-mentioned coextrusion.The light diffusing sheet that makes is carried out the mensuration of following performance parameter:
(1) thermal expansivity test
Test with the ASTM D-696 standard of being determined as.
(2) total light transmittance
With JIS K7136 is that standard is tested.
(3) mist degree
With JIS K7136 is that standard is tested.
(4) scratch resistance
Use having in the direct down type backlight cold-cathode tube LCD TV backlight of market sale, take out anti-warpage projection (by fire-retardant polycarbonate make, most advanced and sophisticated R=1mm), under the state of the load that applies 1000g described three ply board 103 surperficial reciprocating frictions 20 times.
(5) warp direction test
The light diffusing sheet that will expose 168 hours under 85 ℃ of 95%RH atmosphere is as for the 5300Cd/cm that has that equally spaced is arranged with 6 with 2.5cm is set
2On 46 inches straight back light units down of the cold-cathode tube of luminous energy, making picture part be in plumbness, is that backlight side is assembled in the position apart from cold-cathode tube 30mm with described three ply board 103.And then, the interval of 1.0mm is set on the outside of light diffusing sheet (side opposite with backlight side), utilize the thickness 1.5mm glass capsulation, the maintenance that have diameter 5mm hole 1 of central portion.Measure the glass of this moment and the distance (initial value) of diffuser plate.Cold-cathode tube is lit a lamp continuously, and the availability dial indicator is measured variation through the light diffusing sheet after 5 hours with the unit of 0.1mm, and record warpage maximal value, and protruding information slip to backlight side just is being shown, is being shown protruding information slip to glass side negative.
(6) anti-UV stability
Use with the acceleration light fastness test machine of metal halide light, use the optical filtering machine to see through wavelength region may: 295～350nm, operation mode as light source: Continuous irradiation, UV illumination: 77mW/cm2, the BP temperature: 60 ℃, humidity: 50%RH in the groove, spraying: do not have.Test period: 24 hours, the thin slice of use model thickness 2mm.Use beam split type colour meter, come the model after the fast light test is estimated with the Δ E that sees through light.
[embodiment 1]
At first, be 6 * 10 at thermal expansivity
-5Mix type siloxane polymer particle 1.5 mass parts and benzotriazole ultraviolet light absorber 5 mass parts in m/m ℃ polystyrene resin 100 mass parts, and drop in described first laminate, the 101 usefulness extruders as organic class light diffusing agent; Secondly, be 12 * 10 at thermal expansivity
-5Mix monox 2 mass parts and benzotriazole ultraviolet light absorber 5 mass parts in m/m ℃ plexiglass 100 mass parts, and drop in the described three ply board 103 usefulness extruders as the mineral-type light diffusing agent; At last, in the above-mentioned plexiglass of above-mentioned polystyrene resin that is respectively 50 mass parts and 50 mass parts, mix the above-mentioned type siloxane polymer particle of 3 mass parts and the above-mentioned monox of 1 mass parts, and drop in described second laminate, the 102 usefulness extruders, after carrying out fusion, get final product by the coextrusion shaping.The thickness of first laminate 101 described in the light diffusing sheet that makes is 0.5 millimeter, and the thickness of second laminate 102 is that 1 millimeter, the thickness of three ply board 103 are 0.5 millimeter, and the thickness of described light diffusing sheet is 2 millimeters.And, make described first laminate 101 and three ply board 103 surfaces have shaggy ridge design by the hot transfer printing of concavo-convex roller surface configuration.
For the light diffusing sheet that embodiment 1 makes, estimate total light transmittance, mist degree, surperficial scratch resistance, warp direction, anti-UV stability etc. by aforesaid method, its evaluation result is as shown in table 1.
[embodiment 2～8]
Thickness at described light diffusing sheet remains unchanged, under the prerequisite that each resin ratio and adjuvant addition remain unchanged in described first laminate 101, second laminate 102 and the three ply board 103, change the thickness of described first laminate 101, second laminate 102 and three ply board 103, change into respectively: embodiment 2 is for the thickness of described first laminate 101 is 0.3 millimeter, and the thickness of second laminate 102 is that 1 millimeter, the thickness of three ply board 103 are 0.7 millimeter; Embodiment 3 is for the thickness of described first laminate 101 is 0.2 millimeter, and the thickness of second laminate 102 is that 1.3 millimeters, the thickness of three ply board 103 are 0.5 millimeter; Embodiment 4 is for the thickness of described first laminate 101 is 0.1 millimeter, and the thickness of second laminate 102 is that 1.7 millimeters, the thickness of three ply board 103 are 0.2 millimeter; Embodiment 5 is for the thickness of described first laminate 101 is 0.3 millimeter, and the thickness of second laminate 102 is that 1.6 millimeters, the thickness of three ply board 103 are 0.1 millimeter; Embodiment 6 is for the thickness of described first laminate 101 is 0.6 millimeter, and the thickness of second laminate 102 is that 1.1 millimeters, the thickness of three ply board 103 are 0.3 millimeter; Embodiment 7 is for the thickness of described first laminate 101 is 0.7 millimeter, and the thickness of second laminate 102 is that 0.6 millimeter, the thickness of three ply board 103 are 0.7 millimeter; Embodiment 8 is for the thickness of described first laminate 101 is 0.5 millimeter, and the thickness of second laminate 102 is that 0.6 millimeter, the thickness of three ply board 103 are 0.9 millimeter.Method is similarly to Example 1 made light diffusing sheet, carries out the evaluation of each performance parameter, and its evaluation result is as shown in table 1.
[comparative example 1]
At thermal expansivity is 6 * 10
-5Mix type siloxane polymer particle 4 mass parts and benzotriazole ultraviolet light absorber 5 mass parts in m/m ℃ polystyrene resin 100 mass parts as organic class light diffusing agent, drop in described first laminate, the 101 usefulness extruders, carry out extrusion molding after the fusion, the thickness of the light diffusing sheet that makes is 2 millimeters, and by the hot transfer printing of concavo-convex roller surface configuration, make this light diffusing sheet both side surface have shaggy ridge design, the evaluation result of its each performance parameter is as shown in table 1.
[comparative example 2]
In the above-mentioned plexiglass of above-mentioned polystyrene resin that is respectively 50 mass parts and 50 mass parts, mix type siloxane polymer particle 4 mass parts and benzotriazole ultraviolet light absorber 5 mass parts as organic class light diffusing agent, drop in described second laminate, the 102 usefulness extruders, carry out extrusion molding after the fusion, the thickness of the light diffusing sheet that makes is 2 millimeters, and by the hot transfer printing of concavo-convex roller surface configuration, make this light diffusing sheet both side surface have shaggy ridge design, the evaluation result of its each performance parameter is as shown in table 1.
[comparative example 3]
At thermal expansivity is 12 * 10
-5Mix type siloxane polymer particle 4 mass parts and benzotriazole ultraviolet light absorber 5 mass parts in m/m ℃ plexiglass 100 mass parts as organic class light diffusing agent, drop in the described three ply board 103 usefulness extruders, carry out extrusion molding after the fusion, the thickness of the light diffusing sheet that makes is 2 millimeters, and by the hot transfer printing of concavo-convex roller surface configuration, make this light diffusing sheet both side surface have shaggy ridge design, the evaluation result of its each performance parameter is as shown in table 1.
Table one: the evaluation result of the performance parameter of eight embodiment and three comparative examples
| Warp direction | Scratch resistance | Total light transmittance | Mist degree | Anti-UV | |
| Embodiment 1 | ??+ | ??◎ | ??◎ | ??○ | ??◎ |
| Embodiment 2 | ??+ | ??◎ | ??◎ | ??○ | ??◎ |
| Embodiment 3 | ??+ | ??◎ | ??◎ | ??◎ | ??◎ |
| Embodiment 4 | ??+ | ??◎ | ??◎ | ??◎ | ??◎ |
| Embodiment 5 | ??+ | ??◎ | ??◎ | ??◎ | ??◎ |
| Embodiment 6 | ??+ | ??◎ | ??◎ | ??○ | ??◎ |
| Embodiment 7 | ??+ | ??◎ | ??○ | ??△ | ??◎ |
| Embodiment 8 | ??+ | ??◎ | ??○ | ??△ | ??◎ |
| Warp direction | Scratch resistance | Total light transmittance | Mist degree | Anti-UV | |
| Comparative example 1 | ??- | ??△ | ??◎ | ??◎ | ??◎ |
| Comparative example 2 | ??- | ??○ | ??◎ | ??◎ | ??◎ |
| Comparative example 3 | - | ??◎ | ??◎ | ??◎ | ??◎ |
Annotate: 1, warp direction refers to that light diffusing sheet is protruding to be just "+" to the back light direction, protruding to glass for bearing "-"; 2, the performance of " ◎ " expression light diffusing sheet performance functional, " △ " expression light diffusing sheet outstanding, " zero " expression light diffusing sheet is poor.
From the result of table 1 as can be seen, by the resin bed of stacked different heat expansion coefficient, the internal stress of resin bed can make light diffusing sheet to protruding direction warpage to back light, thereby has reached purpose of the present invention.
Light diffusing sheet of the present invention is the multilayer board that is made by two kinds of different resins of thermal expansivity, wherein this multiple-plate skin is made of the low thermal coefficient of expansion resin, internal layer is made of the high thermal expansion coefficient resin, the middle layer is made of with the resin combination that certain proportion mixes these two kinds of resins, and with by skin to the internal layer direction, thermal expansivity forms by ascending mode is laminated.Because under the influence of the heat of light source etc.,, can stipulate that it protrudes to high thermal expansion coefficient layer direction, the light source direction that promptly supports or opposes protrusion when light diffusing sheet because the internal stress that the difference of each layer thermal expansivity produces makes when this kind light diffusing sheet produces warpage.Described light diffusing sheet demonstrates good light diffusing and light fastness simultaneously.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. light diffusion plate for straight-down-type backlight LCD, it is characterized in that, described light diffusing sheet comprises first laminate (101), second laminate (102) and three ply board (103), and described second laminate (102) is arranged between described first laminate (101) and the three ply board (103); Described first laminate (101) comprises the first kind resin of 100 mass parts, the light diffusing agent of 0.5 mass parts～5 mass parts and the ultraviolet light absorber of 0.01 mass parts～10 mass parts; Described second laminate (102) comprises the first kind resin of 100 mass parts and the light diffusing agent of second resinoid and 0.5 mass parts～5 mass parts; Described three ply board (103) comprises second resinoid of 100 mass parts, the light diffusing agent of 0.5 mass parts～5 mass parts and the ultraviolet light absorber of 0.01 mass parts～10 mass parts; The described second resinoid thermal expansivity is greater than the described first resinoid thermal expansivity.
2. light diffusion plate for straight-down-type backlight LCD according to claim 1, it is characterized in that, described second laminate (102) is a single layer structure, first kind resin and the mixed thermal expansivity of second resinoid be greater than the described first resinoid thermal expansivity in described second laminate (102), and less than the described second resinoid thermal expansivity.
3. light diffusion plate for straight-down-type backlight LCD according to claim 1, it is characterized in that, described second laminate (102) is to comprise two-layer at least sandwich construction, every layer in the described sandwich construction includes first kind resin, second resinoid and light diffusing agent, the first kind resin and the second resinoid weight ratio reduce on the direction of three ply board (103) gradually along described first laminate (101) in described each layer, and first kind resin and the mixed thermal expansivity of second resinoid increase on the direction of three ply board (103) gradually along described first laminate (101) in described each layer.
4. light diffusion plate for straight-down-type backlight LCD according to claim 1 is characterized in that, the described first resinoid thermal expansivity is 5 * 10
-5M/m ℃～8 * 10
-5M/m ℃, the described second resinoid thermal expansivity is 10 * 10
-5M/m ℃～13 * 10
-5M/m ℃.
5. according to the arbitrary described light diffusion plate for straight-down-type backlight LCD of claim 1 to 4, it is characterized in that described first kind resin comprises one or more in polystyrene, polychlorostyrene, poly-halogenated styrenes class, polyvinyl toluene and the polyoxyethylene alkylphenyl vinyl resins.
6. according to the arbitrary described light diffusion plate for straight-down-type backlight LCD of claim 1 to 4, it is characterized in that described second resinoid comprises one or more in polymethylmethacrylate, polyethyl methacrylate, poly-n-butyl methacrylate, polycyclohexyl methacrylate, polymethylacrylic acid octadecane ester, polymethacrylate, polymethyl acrylate, polyethyl acrylate, butyl polyacrylate, polyacrylic acid cyclohexyl, polyacrylic acid phenyl ester, polypropylene acid benzyl ester and the polyacrylate resinoid.
7. according to the arbitrary described light diffusion plate for straight-down-type backlight LCD of claim 1 to 4, it is characterized in that, described light diffusing agent exists with atomic form, comprises in type siloxane polymer particle, acrylic polymers particle, calcium carbonate particle, barium sulphate particle, Titanium particles, silicon oxide particle, talcum particle, white carbon particle, mica particle, glass particle, aluminum hydroxide particles, magnesia particle, zinc paste particle and the polystyrene resins particle one or more.
8. according to the arbitrary described light diffusion plate for straight-down-type backlight LCD of claim 1 to 4, it is characterized in that described ultraviolet light absorber comprises that benzophenone series ultraviolet light absorber, triazine are that ultraviolet light absorber, benzotriazole are that ultraviolet light absorber and cyclic imide base ester are one or more in the ultraviolet light absorber.
9. according to the arbitrary described light diffusion plate for straight-down-type backlight LCD of claim 1 to 4, it is characterized in that, when described light diffusing sheet is installed on the direct down type backlight LCD, the front side of described light diffusing sheet be described first laminate (101) towards the liquid crystal panel setting, the back side of described light diffusing sheet is that described three ply board (103) is towards the back light setting.
10. according to the arbitrary described light diffusion plate for straight-down-type backlight LCD of claim 1 to 4, it is characterized in that the thickness of described light diffusing sheet is 0.3 millimeter～4 millimeters.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910181618A CN101776820A (en) | 2009-07-24 | 2009-07-24 | Light diffusion plate for straight-down-type backlight LCD |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910181618A CN101776820A (en) | 2009-07-24 | 2009-07-24 | Light diffusion plate for straight-down-type backlight LCD |
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| CN101776820A true CN101776820A (en) | 2010-07-14 |
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|---|---|---|---|
| CN200910181618A Pending CN101776820A (en) | 2009-07-24 | 2009-07-24 | Light diffusion plate for straight-down-type backlight LCD |
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| CN103460077A (en) * | 2011-03-31 | 2013-12-18 | 索尼公司 | Printed material and photographic material |
| CN102707474A (en) * | 2012-05-11 | 2012-10-03 | 京东方科技集团股份有限公司 | Bending liquid crystal display screen and manufacturing method and manufacturing device of bending liquid crystal display |
| CN102707474B (en) * | 2012-05-11 | 2013-07-24 | 京东方科技集团股份有限公司 | Bending liquid crystal display screen and manufacturing method and manufacturing device of bending liquid crystal display |
| US9256105B2 (en) | 2012-05-11 | 2016-02-09 | Boe Technology Group Co., Ltd. | Bended liquid crystal display and its manufacturing method and apparatus |
| CN107613838A (en) * | 2015-05-29 | 2018-01-19 | 奥林巴斯株式会社 | The manufacture method of camera device, endoscopic system and camera device |
| CN109835041A (en) * | 2017-11-27 | 2019-06-04 | 现代摩比斯株式会社 | Transparent component for automobile inner part |
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