TWI237127B - Structure of a diffuser with improved the transmittance - Google Patents

Abstract

A structure of a diffuser is provided that an anti-reflection layer with low reflectivity is formed, and particularly, placed on the bottom surface of the diffuser. The anti-reflection layer is a thermosetting resin and comprising plurality of the nanometer particles, which are randomly mixed with the thermo plastic resin by ethanol as a solvent. As a result, the anti-reflection layer has a characteristic with low reflectivity, the transmittance is improved when an incident light incidents through the thin film. Furthermore, due to the plurality of the nanometer particles in the anti-reflection layer, the incident light is diffused when the light incidents through the anti-reflection layer. Hence, a display with a uniform and bright surface light source is provided.

Description

1237127 ^ — V. Description of the invention (1)-[Technical field to which the invention belongs] In particular, it relates to a structure of a diffuser plate that can increase the strength of a hand. 1. [Previous technology] Liquid crystal display (Liquid Crystal = display device, need to use the backlight ^ ay, LCD) is non-white = 疋 backlight system T, the diffusion film transmittance two to the function of the display. The utilization effect of the first source + will directly affect the liquid crystal display module is one: for the display quality, its large size liquid crystal, f% ^ ^ ^ required components. High quality, high performance of this backlight technology # b's moonlight technology is compatible with nf, such as the bright sound, t,%, thin, etc., and low cost, low consumption Important role. °. In the performance of the orthodox moon b, the backlight ^, the reflection plate, the light guide plate, and the expansion in the liquid crystal display are surface light sources that can effectively uniformize the incident light. A traditional I diffuse layer (diffusing iayer) on the surface, and the diffuse layer contains I ', and the diffuser diffuser (binder) and filled diffuser | Light source (ie, cold cathode tube H, etc.), where the function of the diffuser is provided for a liquid crystal display. A uniform diffuser includes a transparent substrate and a diffuser layer formed on the transparent substrate. (Scatters) The spherical material particles are mainly caused by the refractive index difference between the adhesives in the diffusion layer. When the scattered light passes through the diffusion layer, it will continue to be on page 5 1237127 V. Description of the invention

The phenomenon of reflection and scattering in a medium with two different refractive indices. Gp 1: k ′ At this time, the light is refracted at the same time, and the effect of p is reduced to optical diffusion. With the indispensable role of flat panel displays, the 5th display 'quality display of day quality occupies a part, and the anti-reflection film plays an important role in improving the quality of the display. The role of the anti-reflection film is that it is one of the important applications in the performance of the principle, the main principle is I ey; minus> 'reflection increases the characteristics of light penetration, penetration and reflection of the display element, and the two t-ray wavelengths pass through the anti- The reflective coating will pass through the incident wavelength, and the product of the refractive index and the thickness of the partially-incided wavelength coating will be the incident wave. The odd multiple effect 'causes interference and obtains a reflection effect. For =: " Unstable panels, every 1% increase in reflectance means a loss of 1%. If f is known, 1% of brightness is lost. Therefore, the LCD panel must increase the transmittance as much as possible while reducing its reflectance. . The traditional diffuser structure is briefly described below with the first figure. Refer to the first figure, 'Providing a transparent substrate 1 〇1, the material of this transparent substrate 1 〇 丨 can be an acrylic (acry 1 ic) resin sheet, such as a homopolymer (h 〇m ο ρ ο 1 ymer) based Polymethyl methacrylate. A diffusion layer is deposited on the transparent substrate 101. The diffusion layer includes a polymerizable binder 1 0 3 and a plurality of binders. Spherical scatterers 105. The polymerizable adhesive 1 0 3 is a high molecular polymer containing monobasic polyacrylate (P 0 1 y a 1 k y 1 m e t h a c r y 1 a t e) as a main functional group, such as polymethylmethacrylate.

Page 6 1237127 V. Description of the invention (3) Polyethyl methacrylate or polypropyl methacrylate, etc. The scatterer ι〇5 can include any substance with a refractive index, and its refractive index is different from that of the transparent substrate 1 0 1, the adhesive 1 0 3, and the acrylic resin film 1 〇 7 'its scatterer 1 The material of 0.5 can be stone oxide, magnesium oxide, titanium oxide, and the like, and the size of the particles can be between 1 and 100 microns. The polyethylene resin film 107 is formed on the diffusion layer and has the same composition as the transparent substrate 101.

When the incident light passes through the diffusion layer containing the scatterer 105 and the adhesive 103, 'the refractive index of the scatterer 105 and the adhesive 103 is different, so the incoming light will pass through The phenomenon of refraction, reflection and scattering occurs, that is, the incident light reaches the effect of being diffused, but the conventional diffuser plate has a low light transmittance, and its transmittance can only reach about 85%. Therefore, the light The utilization rate is not high, which further affects the overall brightness performance of a display element, such as a liquid crystal display. Due to the use of the conventional diffuser structure, the transmittance of incident light cannot be improved ', so it is urgent to provide an improved diffuser structure to make the transmittance of light long: still, and increase the brightness of the display. 2. Summary of the Invention An object of the present invention is to provide a diffusion plate structure, which is formed below the diffusion plate to form an anti-reflection layer with low reflectance.

1237127 V. Description of the invention (4) The layer can increase the transmittance of incident light, and further increase the brightness performance of the display. Another object of the present invention is to provide a diffuser plate structure, which includes providing a thermosetting resin having nano-scale particles, which can utilize the characteristics of nano-particles and thermosetting resins having different refractive indices, thereby providing a uniform surface of the display. Light source and improve the performance of the backlight module. According to the above purpose, the present invention provides an improved diffusion plate. First, a transparent substrate, such as a plastic resin substrate, is provided. The material can be polycarbonate, polystyrene, polyene, polyether, polyester. , Polyamidoamine, polyphenylene sulfide, polyether sulfide, polyethylene gas or polymethacrylic resin, etc. A diffusion layer is formed on the upper surface of the transparent substrate. The diffusion layer includes a plurality of spherical particles and a main material. The material of the plurality of spherical particles is an organic polymer, such as polymethyl methacrylate. Inorganic materials, such as titanium dioxide (T i 0 2), silicon dioxide (S i 0 2), or glass beads, and the main material is also an organic polymer, such as ethyl amino resin, ethyl acetate, and ethyl acetate. Resin, chloroethylene resin, styrene resin or polyethylene resin, etc. At the same time, the diffusion layer may have a wedge shape or an irregular shape. An anti-reflection layer having a low reflectance is formed below the transparent substrate. The anti-reflection layer contains a thermosetting resin and a plurality of nanometer-sized particles. The thermosetting resin and a plurality of nanometer-level particles use ethanol as a The solvent is dispersed and the two can be arbitrarily mixed in a single process, such as a wet process or a dry process. Finally, the anti-reflection layer having low reflectance is coated or evaporated.

1237127 V. Description of the invention (5) On the lower surface of the transparent substrate. 4. [Embodiment] The following is a detailed description of the present invention. The description of the process and structure in the following description does not include the complete process of production. Existing techniques used in the present invention are only cited in detail here to help explain the present invention. The content of the present invention can be disclosed through the following description of a preferred embodiment and related diagrams (second to third figures). Referring to the second figure, first 'provide a transparent substrate 2 01 with high transparency and high mechanical strength, such as a plastic resin substrate. The thickness of the transparent substrate 2 1 is in the range of 2 5-150 micrometers (micrometer, / / m), in addition, the material of the transparent substrate 201 of the plastic resin film may be polycarbonate (polycarbonate), polystyrene (polystyrene), polyester (polyester), or polyolefin. (polyolefin), polyether, polystyrene, polyamide, polyphenylenesulfide, polyether-ester, polyester, or polymethyl ether Polymethacrylate and so on. Next, a diffusion layer is formed on the transparent substrate 201, and the diffusion layer contains a plurality of spherical particles 2 05 and is doped in a host material layer 2 03, a plurality of spherical particles The material of 2005 is an organic south molecular material or an inorganic material, such as polymethyl methacrylate (PMMA), titanium dioxide (Ti02),

1237127 V. Description of the invention (6) Silicon dioxide (S i 0 2) or glass beads, etc. The material of this main material layer 2 0 3 is also an organic polymer material, such as urethane (ure ΐ hane) Tree moon purpose, vinyl acetate resin, vinyl hi or ide resin, styrene resin or polyethylene resin, etc. On the other hand, the shape of the diffusion layer formed by the plurality of spherical particles 2 05 and the main material layer 2 0 3 may be changed or irregular. The main material layer 2 0 3 is a fluid (fl u 丨 d). The size of each spherical particle 205 is between 1 and several tens of micron metr. It should be noted that the refractive index (ref racti ve index) of each spherical particle 205 is not the same as the refractive index of the main material layer 203. Therefore, when incident light passes through the main material layer 203 and a plurality of Only when the interface between the spherical particles 205, the light is diffused. The manufacturing method of the material Got diffuser plate 'mixes spherical particles 2 5 into the main material layer 2 0 3, and applies the coating method' to coat the diffused layer of the coated particles 2 ° 3 on a transparent After the substrate 201 is said on the surface, a curing (cur i η, organic solvent of * is performed. In this diffusion layer, the second solid :: fat this expansion 'layer of inner particles is used, so that the high density = = = = When several spherical particles of light pass through the diffusion layer, the spherical shape is uniformly expanded by 2,05, so that the incident cannot exceed 300% of the weight of the main material layer, 203, -the weight of spherical particles 205 = get Appropriate transmittance, and it will affect the carp. Otherwise, the incident light is not only impossible. The weight of spherical particles 205 should not be lower than that of loose particles. On the other hand, the main material layer 203 weighs 1 〇. %

Page 10 1237127___ V. Description of the invention (7) ’Otherwise, it will affect the effect of the incident light being diffused. Therefore, the density of the spherical particles 205 must be appropriately controlled. Because the diffuser formed by spherical particles 205 and the main material 203 can penetrate the incident light, but its achievable transmittance is limited, for example, 85% light transmittance. Therefore, The invention forms an anti-refiection layer with a low reflectivity on the lower surface of the transparent substrate 201. The anti-reflection layer includes a plurality of particles 2 having a nanometer level. 0 9 and a thermosetting resin 2 0 7 'The plurality of nano-sized particles 2 0 9 are randomly mixed in the thermosetting tree month 2 0 7' and the two are mixed in an ethanol solvent, The thickness of the anti-reflection layer ranges from 1 to 30 microns, and the size of the plurality of nano-particles ranges from 0.001 microns to 0.001 microns. Because when the incident light passes through the anti-reflection layer formed by the compound = nanometer 2 0 9 and the thermosetting resin 207, a light has the same characteristics of transmission and reflection. Since the present invention has the characteristics of low reflectance by using the anti-reflection layer f t 2 f t of a plurality of nano particles 209 and thermosetting resin 207 and the low reflectivity, the transmittance can be reduced. 'Emissivity, and increase the transmittance of incident light, such as 5% light penetration ^ $ 外' This anti-reflection layer has a plurality of nano particles 209, so: when passing through this thin film layer, it can increase the incidence The effect of light being diffused. 7. A display, such as a liquid crystal display, a uniform and bright surface light source. J Chier

Page 11 1237127 V. Description of the invention (8) The anti-reflection layer is formed on a lower surface of the transparent substrate 20 1 by a process such as a wet potential process. The coating method, or an ultra-thin coating method, the wet process is a method of micro-gravure coating ^ 'Such as a micro gravure printing (a coating) method, will ; The substrate says' on a square surface, and then, a curing system is performed to remove the ethanol solvent from the etalon: moon shot layer. In addition, in the execution of the dry process, several thermosetting resins 207 and a plurality of nano particles 209 are dissolved in ethanol, and 3 ==, using-evaporation method, such as a vacuum evaporation method, this two = The anti-reflection layer is vapor-deposited on the lower surface of the transparent substrate 2. Since the thickness of the anti-reflection layer can be accurately controlled by the steaming method, in all visible light ranges (4 0 0-7 0 0 nm), and its reflectance can be controlled below 0.5%. Finally, the structure of the diffusion plate of the present invention is completed. The anti-reflection layer with low reflectivity according to the present invention can increase the transmittance of incident light by about 5% after actual testing. Therefore, using this anti-reflection layer with low reflectivity to form a high-reflection layer The transmittance of the diffuser plate structure, which is added to the application of a backlight module with this structure, can compensate for the light intensity lost due to the incident light passing through the backlight module. As shown in the third figure, a backlight module is provided. The backlight module includes a light source 2 9 and the light source 2 19 can provide a parallel incident light 2 7. In addition, the backlight module also provides a 'light plate 211 on the lower surface of the anti-reflection layer with low reflectivity'. The material of the light guide plate 2 1 1 may be an acrylic resin, and the light guide plate 2 1 1 includes a plurality of Diffuse points 2 丨 3 with equal spacing on the bottom of the light guide plate 2 丨 1

Page 12 1237127 V. Description of the invention (9) ~~~~-On the surface of the surface, the material of the diffusion points 2 丨 3 may be titanium dioxide (Ti02). In addition, the backlight module further provides a reflecting plate 21 5 on the lower surface of the light guide plate 211 to increase the use efficiency of the incident light / 21 7. When the backlight module is added by using the diffuser structure of the present invention, the diffuser structure has the characteristic of high transmittance. Therefore, the supply-display, such as a liquid crystal display, is a high-performance backlight technology. From the above description of the preferred embodiments of the present invention, one of the advantages of this description is to provide—a diffuser plate structure formed on the lower surface of the plate structure—with a low reflectivity. Reflective / ^, the reflective layer is a thermosetting resin and contains a plurality of :: sub: Nano-level particles are based on ethanol as any of the two thermosetting resins, because this anti-reflection layer has low anti-reflection and can be mixed here. When the incident light passes through the thin film layer, the transmission characteristics can be improved. Because the anti-reflection layer has a plurality of nano particles, because of the transmittance, moreover, the light will be diffused by the reflection layer, so it can emit light. Pass the surface light source with high resistance and brightness. For the display to be uniform ~ The above description is only the preferred specific implementation of the present invention, and the patent application rights of the present invention; meanwhile, the above professionals in Asia and Africa should be able to understand and implement, because: ^ Regarding the equivalent changes or changes made under the spirit of the disclosure of this technology, he has not departed from the scope of patent application of the present invention. / 饰 ’should be included in

Page 13 1237127 Schematic description of the schematic diagram of the cross-section of the structure of the board 1 Expansive expansion of the knowledge sheet simple structure diagram Figure 1 t The fifth expansion of the structure of the board through the penetration rate; It is clear from the above that the structure of the structure of the root case is based on the real picture body, the second best, and the rate of expansion of the structure plate is high. The meaning of the figure indicates the origin of the drawing group, which is based on the three-mode light-back symbol of the pattern. R— The main stand 101 Transparent substrate 103 Adhesive 105 Scatterer 107 Acrylic resin film 201 Transparent substrate 203 Main material layer 205 Spherical particles 207 Thermosetting resin 209 Nano-sized particles 211 Light guide plate 213 Diffusion point 215 Reflective plate 217 Incident light

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Claims (1)

Years _ • A diffuser plate structure capable of improving transmittance, comprising: a transparent substrate; a diffusion layer having a plurality of spherical particles is located on an upper surface of the transparent substrate; and an anti-reflection with low reflectivity The layer is located on the lower surface of one of the transparent substrates. The diffuser plate structure that can improve the transmittance as described in item 丨 of the patent application range, wherein the material of the diffusion layer is selected from the following: vinyl acetate (vinyl acetate resin and vinyl chloride resin and styrene resin. 3. The diffusion plate structure capable of improving transmittance as described in item 1 of the scope of patent application, wherein the material of the transparent substrate is a polyester resin. 4 · The diffusion plate structure capable of increasing the south transmittance as described in item 1 of the scope of the patent application, wherein the material of the transparent substrate is a polycarbonate tree. 5. As described in item 1 of the scope of the patent application, the diffusion plate structure with the same transmittance is described, wherein the anti-reflection layer having the low reflectance described above is composed of a thermosetting resin and a plurality of nano-sized particles. Test 27: t number 93102869 said amendment 6. Application for exclusive deduction range 6. The diffusion plate structure that can improve the transmittance as described in item 5 of the scope of the patent application, further including the thermosetting resin and the plurality of nano-sized particles. In an ethanol solvent. Page 17