TWI361288B - Cover sheet for prism and backlight unit assembly - Google Patents

Description

1361288 IX. Description of the Invention: [Technical Field] The present invention relates to a cymbal protection sheet and a backlight module assembly, and more particularly to a flat panel display, such as a liquid crystal display (Liquid Crystal Display, hereinafter referred to as A 稜鏡 protection sheet for a backlight module of an LCD) or a Light Emitting Diode (hereinafter referred to as LED), and a backlight module assembly having the 稜鏡 protection sheet. [Prior Art] As for a display using a liquid crystal, various types of optical sheets must be used. In an LCD, since its own element cannot emit light, a light source called a backlight unit must be mounted on the back of the LCD panel. The total brightness of the LCD depends on the performance of the backlight module, so the backlight module plays an important role in the LCD. 15

The backlight modules are mainly classified into a side-in type and a direct-in type, and their general structures are as shown in the first to third figures. The first and second figures illustrate the side entry type, and the third figure illustrates the direct type. In particular, the first _ spear is used in the standard type of backlight module of the notebook computer. As shown in the second figure of the first panel, the side light type includes a lamp (6) ' disposed at the edge portion of the guide hole (2) and 'as shown in the third figure*, and the direct type includes a hole disposed below the diffusion plate. Light tube (6). The side-light type backlight module is mainly used for a pen computer or a 19-inch or smaller glory screen, a money-setting device, a personal digital assistant navigation tool, and a game machine; and a direct-type backlight module is used for 2 or smaller screens and TV sets. ‘ ί

6 More specifically, the side entrance type backlight module has a reflection sheet (1) disposed at a lowermost portion thereof and a light guide plate (2), a lamp tube (6), a diffusion sheet (3), and a prism sheet (4) The structure in which the cymbal piece (4') and the protective sheet (5) are sequentially disposed thereon. ^The lower type backlight module has a reflection sheet (1) disposed at the lowest part thereof, and the lamp officer (6), the diffusion plate (3), the diffusion sheet (3), the cymbal piece (4), and the protection piece (5) are sequentially arranged. The structure on it. The reflection sheet (1) is for illuminating the downwardly directed light to the maximum extent to cause the light to be directed upward to increase the efficiency of the tube. Such a lamp (6) is exemplified by a cold cathode fluorescent lamp (CCFL). The light guide plate (2) for the side entrance type backlight module is used for uniformly transmitting the light generated by the lamp tube (6) disposed at the edge portion thereof to the entire surface of the backlight module. That is, the light guide plate (2) is a light source for converting a fluorescent lamp (6) of a nearly linear light source into a surface light source. The light converted to the surface light source by the light guide plate (2) exhibits uneven brightness on the entire surface thereof. That is, although the linear light source of the lamp (6) has been replaced by the light guide plate (7) as a surface light source, the uniformity of the light is partially lowered, so that it is impossible to obtain a uniform light source for the backlight module. Therefore, in order to achieve the desired uniform light source, f applies the diffusion sheet (3) described in the month 1j to the light guide plate (2). The function of the diffuser (3) is used to expand the light emitted by the light guide plate (2). As a result, when the light is expanded, a part of the uneven brightness on the entire surface of the backlight module can be improved. Further, when light is diffused through the diffusion plate (3), in addition to the improvement in uniformity, the direction of light transmission is also diffused to the front surface thereof, thereby increasing the front surface twist. If the diffuser plate is not used, the light emitted from the light guide plate (2) is not mainly transmitted to the front surface direction, but is transmitted to a direction deviating from the front surface direction of the front surface 1361288 by about 60 degrees. Therefore, the diffusion sheet (3) has a responsibility of diffusing light in all directions, thereby increasing the brightness in the direction of the front surface. For example, it is advantageous to use the diffusion sheet as described above, but it is not preferable from the viewpoint of the light guide plate; Therefore, in order to achieve the desired function of the backlight module, the light should be guided as far as possible to the front surface direction. To achieve this, the cymbal (4) is additionally applied to the diffusion sheet (3). ...

The function of the cymbal (4) is to collect light from the diffusion sheet (3) in the front surface direction (light diffused in each direction). Therefore, the use of the mirror (4) on the diffusion sheet (3') increases the brightness of the front surface by about h5 times or more. Therefore, almost all backlight modules for LCDs use cymbals (4). Since the cymbal has a structural characteristic that is easily damaged by external contact, a protective sheet is further provided on the prism sheet (4) to complete the backlight module. In addition to using a reflective sheet or a reflecting plate at the lowest portion thereof (1) In addition, the structure of the direct type backlight module is the same as that of the side edge type backlight module. However, unlike the side edge type backlight module, the direct type backlight module includes a plurality of long and thin, a fluorescent tube (6) arranged linearly on the entire surface of the backlight module. The diffusion plate (3') is additionally disposed thereon. The function of the diffusion plate (3') is to hide the linearity. The line of the lamp tube (6) is arranged to uniformly diffuse the light. The diffusion sheet (3) is also applied to the diffusion plate (3,) to complement the diffusion function of the diffusion plate only to achieve an ideal diffusion function. The stencil (4) and the protective sheet (5) are used on the diffusion sheet (3), which is the same as in the side-lighting type backlight module. Regardless of the 稜鏡 protection sheet (5), the side-lighting type backlight module is used. In the direct type backlight module, the 稜鏡 protection sheet (5) must have various characteristics, specifically稜鏡, 稜鏡 protective sheet (5) must exhibit high brightness and excellent ability to block the prism tip 8 1361288, and, since the 稜鏡 protective sheet (5) is placed on the prism sheet (4), it will encounter various additions I The process, such as printing, cutting and cutting, must also have superior processability. In addition, after the prism protection 4 is placed on the prism sheet, the 稜鏡 protection sheet itself cannot damage 5 稜鏡. Surface. • With this in mind, the protective sheet has a protective film (51, 5G1) and a protective layer on both surfaces of the base film as shown in the fourth and fifth ffl (52, 53, 502, 503). For convenience, the surface of the prism protective sheet in contact with the enamel layer is referred to as a first protective layer (53, 5〇3), and the other surface of the prism ίο protective sheet, It is referred to as a second protective layer (52, 5〇2). In the denture-preventing film, the protective layer is formed by coating a composition solution containing a binder and light-diffusing particles; specifically, the first The protective layer (53, 503) needs to use a large number of particles or large-sized particles to penetrate The light is diffused to increase the brightness. For example, the Korean Unexamined Patent Publication No. 2003-009460A discloses a 稜鏡 protection sheet as shown in the fourth figure, and a backlight module as shown in the seventh figure. Specifically, the 稜鏡 protection sheet is configured to use a composition having a light diffusing agent (50) having an average particle diameter of 3 to 30 dispersed in the adhesive resin, and having a thickness of 1 〇 to 50 μm and a light diffusion layer (second protective layer, 502) having a surface roughness 〇·〇5 to 5 -20, formed on a surface of the base film (501) having a thickness of 10 〇 to 2 〇〇 μη; a light diffusing agent (5〇') having an average particle diameter of 5 μηι dispersed in a binder resin, a backside diffusion layer having a thickness of 1 to 10 and a surface roughness of 0.001 to 1.0 μm (first protective layer, 503) ) is formed on the other surface of the base film (501). 9 1361288 then a surface of the base film 'having a light diffusion layer (second protective layer, 5 〇 2) having a surface roughness (Ra) of 〇〇5 to 5 〇μη, expanding the incident light from the light source In order to increase the redundancy, block the tip of the crucible, and improve the easy processing of the 2-hole processing of printing and cutting. The other surface of the base film has a back side diffusion layer (the first-protective layer '503) having a surface roughness of 5 and a roughness of 0.001 to 1.0 in direct contact with the tip end of the crucible, g), and the tip of the crucible is not hindered. And in the case of vibration, it will not damage the crucible. In addition, a backlight module assembly for preventing 稜鏡 breakage is disclosed in the Korean Unexamined Patent Publication No. 2, No. Hei. There is a structure as shown in Fig. 5, in which the first protective layer (53) of the protective sheet in contact with the crucible is flat to avoid damage to the crucible. A backlight module assembly including such a protective sheet is as shown in the eighth figure. When the surface of the protective sheet in contact with the prism, that is, the surface of the first protective layer 15, is flat, or when the number or size of particles used to form the first protective layer is less or less than When the number or size of the particles of the second protective layer is used, the damage of the tip of the crucible can be avoided, but the viewing angle is reduced. Furthermore, since a plurality of large-sized particles are disposed on the surface layer, the inconspicuous appearance results in a poor appearance. SUMMARY OF THE INVENTION "Problem to be Solved" According to an embodiment of the present invention, a light-diffusing particle is used 10 1361288 15

20 A composition in which a protective layer is formed on both surfaces of the base film, and when the haze of the protective layer in contact with the crucible is higher than the haze of the surface protective layer, the viewing angle can be widened. Accordingly, the present invention provides a enamel protection sheet which can increase the viewing angle and ensure uniform appearance when the desired front surface brightness is satisfied. Further, according to another embodiment of the present invention, when the enamel layer of the cymbal sheet is formed of an elastic material, the enamel protection sheet can be effectively prevented from damaging the ruthenium layer. Accordingly, the present invention provides a backlight module assembly including a prism protective sheet capable of compensating for a viewing angle and ensuring uniform appearance when the twist of the crucible surface is satisfied. Furthermore, the present invention provides an optical sheet assembly for a backlight module, comprising a layer having a layer of a layer, which is capable of effectively avoiding damage caused by the sheet of protective sheet. "Technical means" ^Ben Qiming provides a kind of protective sheet that is in contact with the enamel layer, and contains a base film 'with light when there is a light-expanding residue and a binder-like composition to form a protective film on the two surfaces. a layer; wherein the protective layer in contact with the layer is haze higher than the haze of the surface layer. The protective layer in contact with the enamel layer in the protective sheet may have 10:2 and the surface protective layer may have a haze of 5 to 6%. The difference in haze between the protective layer and the surface protective layer of the towel's scalar layer contact may be 5 to 6 %. The protective sheet of the present invention may have. Further, the present invention provides a module assembly. 15 to 100% haze. The backlight including the foregoing 稜鏡 protection sheet is: 1 In addition, the present invention provides a backlight module assembly including at least one prism sheet including a base film and a ruthenium layer, and the prism layer is transparent. An elastic polymer material is formed on a surface of the base film, and the enamel layer has a plurality of three-dimensional structures arranged in a repeating pattern; the backlight module assembly further includes a prism protection sheet in contact with the prism layer. Wherein the aforementioned protective sheet has a base film and a protective layer formed on the two surfaces of the base film by using a composition containing light-diffusing particles and a binder, and a mist of a protective layer in which the prism layer is in contact with the prism layer Degree, higher than the haze of the surface protective layer. In the backlight module assembly of the present invention, the protective layer of the prism protective sheet in contact with the ruthenium layer may have a haze of 10 to 70%; and the surface protective layer may have a haze of 5 to 60%. In the backlight module assembly of the present invention, the protective layer and the surface protective layer of the 稜鏡 protective sheet which is in contact with the ruthenium layer may have a haze difference of 5 to 60%. In the backlight module assembly of the present invention, the prism protective sheet may have a haze of 15 to 100%. In the backlight module assembly of the present invention, the enamel layer of the cymbal may have a modulus of elasticity of 0.05 to 100 kg per square millimeter. In the backlight module assembly of the present invention, the enamel layer of the cymbal may be one or more selected from the group consisting of polyurethane, styrene-butadiene copolymers, Polyacrylate, polymethacrylate, polymethylmethacrylate, polyethylene terephthalate 12 1361288 elastomer terephthalate elastomers, Polyisoprene and polysilic fluorene polymer material JOr^r+: «Efficacy A ruthenium protection sheet according to the present invention has a base film and uses a light-diffusing particle And a composition of the binder, a protective layer formed on both surfaces of the base film. When the protective layer in contact with the ruthenium layer is configured such that the haze is higher than the haze of the surface protective layer, the light scattering property of the protective layer in contact with the ruthenium layer is further improved, thereby enhancing contrast and widening. Viewing and protecting) ί can be effectively applied to LCDs such as LCD screens, notebooks, personal digital assistants, word processors, mobile phones, etc., while maintaining proper brightness while requiring wide viewing angles and high contrast LCDs. Backlight module assembly used. 15 Forming a backlight module assembly of the invention comprising an elastic material comprising a enamel protection sheet; a ridge ridge piece, and a light diffusion granule for contact with the ruthenium layer; 'and the protective layer on the surface is formed, the haze of the protective layer formed on the surface of the base film and the surface protective layer, the high layer is stepped up, and the S is in contact with the contact layer. Light scattering mirror layer. In the end, you can dream k /, widen the angle of view, and avoid the damage of the corners and the high brightness of k. At the same time, you need the wide-view digital assistant, Wenchalu. , notebook computer, TV, personal backlight module, mobile phone, and game console LCD 20 1361288 [Simple diagram description] The first picture is the sectional view backlight module assembly; the first picture is Sectional view, not a side-into-light type backlight module assembly; the second picture is a sectional view, g are all 4 not a direct type backlight module assembly; the fourth picture is a sectional view, Ig thousand.' Not a conventional 稜鏡 protective sheet;

A standard type of five diagrams for a notebook computer is shown as a sectional view, and a thousand sm is used to ride a 4 不 不 不 不 不 不 ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; nn The 稜鏡 稜鏡 稜鏡 ; ; ; ; ; ; ; ; 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 弟 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 43 Assembly; display another conventional light X® (four) surface diagram for the backlight module 'Heben's invention---------------------------------------------------------- Layer damage resistance test; 'Tenth-picture is a scanning electron microscope image showing the damage of the general bracts protected by the protective sheet in the optical sheet assembly for the backlight module; and the twelfth The figure shows a scanning electron microscope image showing the case where the elastic cymbal protected by the protective sheet is not damaged in the optical sheet assembly for the backlight module. ' <Description of Component Symbols Used in the Drawings> 1 Reflecting Sheet 2 Light Guide Plate 14 1361288 3' Diffuser Plate 5 Protective Sheet 3 Diffuser 4, 4' Prism Sheet 6 Lamp 50, 50' Light Diffusion Particles 51, 501 , 5001 base film 52, 502, 5002 second protective layer (upper surface)

53, 503, 5' first-protective layer (layer in contact with enamel, lower surface) 1004 elastic cymbal 10 [Embodiment] This I month-wide example provides an assembly for forming a backlight module.稜鏡 protection sheet. The prism sheet is basically used to increase the brightness of the front surface of the backlight module, and the protective sheet is provided on the prism sheet in order to increase the viewing angle and ensure a uniform appearance. Specifically, the angle of view increased by the degree of light scattering of the protective sheet contacted with the crucible is higher than the angle of view increased by the degree of light scattering of the surface layer of the protective sheet. According to the foregoing embodiment of the present invention, the enamel protection sheet has a film thereof, and a protective layer formed on the two surfaces of the base film using a solution containing a composition of light-diffusing particles and a binder; , contact with the prism ^ The haze of the protective layer is still in the haze of the surface protective layer. When the haze of the protective layer in contact with the crucible is higher than the haze of the surface protective layer, the contrast is increased and the viewing angle is widened. In another aspect, when the haze of the protective layer in contact with the crucible is lower than the haze of the protective layer of the surface 1361288, the contrast is relatively lowered and the viewing angle is reduced. The haze can be adjusted with the roughness of the surface structure. In view of this, the embodiment is a method of using a particle having a large or small size, or using a large amount of particles to increase the number of particles protruding from the surface, thereby adjusting the haze 5. However, the method of adjusting the haze is not limited to the foregoing. As shown in the sixth figure, the protective sheet having a large size (5〇) is used for the lower surface of the base film (5001), that is, the protective layer (5003) in contact with the prism; and has a small size. The particles (5 Å,) are used for the upper surface of the base film (5〇〇1), that is, the surface protective layer (5002), and further, a haze difference is generated between the upper surface and the lower surface. In this case, the protective layer (5〇〇3) in contact with the crucible causes the light passing through the crucible to be diffused, and the surface protective layer (5〇〇2) causes the diffused light to be in advance Transmitted within the angular range, resulting in increased contrast and widened viewing angle. However, when the haze of the protective layer (5003) in contact with the crucible is lower than the haze of the is surface protective layer, the light passing through the crucible is transmitted within a predetermined angle range, and the transmitted light will By the diffusion of the surface protective layer (5002), the contrast is reduced and the viewing angle is reduced. According to the foregoing embodiment of the present invention, the protective layer (5〇〇3) in contact with the crucible may have a haze of 1G to 280 Å, and the surface protective layer () may have a haze of 5 to 60%. ^ The haze of the protective layer (5003) in contact with the crucible should be higher than the haze of the surface protective layer (50G2). If this is not the case, the viewing angle and contrast may be reduced when the haze of the protective layer (5003) in contact with the crucible is too low. Conversely, when the haze of the protective layer (5GG3) in contact with the mirror is too high, the brightness may be reduced by 16. Further, the haze of the surface protective layer (5002) should be lower than the haze of the protective layer (5003) in contact with the crucible. However, when the haze of the surface protective layer (5〇〇2) is too low, visual defects may occur due to surface reflection. Conversely, when the haze of the surface protective layer (50〇2) is too high, the brightness may be lowered. Therefore, the haze of the protective layer (5003) in contact with the crucible is controlled to be a haze which is still in the surface protective layer (5〇〇2), so that the protective layer (5〇〇3) and the The difference in haze between the surface protective layers (5002) is between 5 and 6 〇〇/0. The total haze of the enamel protection sheet (5) is in the range of 15 to 1 〇〇〇 / 0. In the enamel protection sheet of the present invention, when the haze of the protective layer (5〇〇3) in contact with the prism is increased, there may be a problem that the tip of the ruthenium sheet is worn due to the friction of the protective layer with the tip end of the prism sheet. However, since this problem can be prevented by appropriately changing the material for the sepals, it is not serious. For example, Korean Unexamined Patent Publication No. 2〇〇5_〇 288 288 - - - - - - - - , , , , , , , , , , 288 288 288 288 288 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 #When using this lens, although the haze of the inclined layer (drain) is covered by the large-size particle shear force σ pure, the damage of the tip of the crucible can be avoided. In the film of the present invention, the base film contains a very transparent polyolefin resin, or a polycarbon (tetra) resin. Preferably, the resin having good mechanical strength and high processability is exhibited to be produced from a backlight. In particular, a polyethylene oblique dicarboxylic acid self-coating film can be used, and one (10) 1361288 is disposed on one surface of the base film. The protective layers (5〇〇2, 5〇〇3) (shown in the sixth figure) are formed by using a composition solution containing light-diffusing particles and a binder, and the aforementioned light-diffusing particles include Organic or inorganic particles. Examples of the inorganic particles include cerium oxide, cerium oxide, carbonic acid, 5 barium sulfate and monoterpene peptide, and examples of the organic particles include homopolymers or copolymers obtained from monomers such as styrene, three Melamine formaldehyde, benzoguanamine formaldehyde, benzoguanamine melamine formaldehyde, propylene, ethylene, polysilicon, urethane Ethyl urethane and methy lmethacry late 'The foregoing items may be used in a monodisperse type or a polydisperse type, and there is no particular limitation in the present invention. Examples of the binder include thermoplastic or ultraviolet curable resins such as P〇ly Vinyl resin, acrylic resin (acryHc resin), 15 polyester resin (P〇lyester, styrene resin, alcohol). An alkalid resin, an amino resin, a polyurethane resin, and an epoxy resin. The composition solution containing the light-diffusing particles and the binder And applied to the two surfaces of the s-based film, followed by drying to obtain a ruthenium protection sheet. 20 The process of applying the composition solution containing the light-diffusing particles and the binder is not particularly limited as long as it is It is well known in the technical field, and according to the material and shape of the base film, an air knife process, a gmvure pr〇cess, a metering process (Meyer sinking process), and a counter can be performed. The reverse r〇ii pr〇cess or the spray process 18 1361288 process). As shown in the ninth embodiment, another embodiment of the present invention provides a backlight module assembly. The backlight module assembly includes a cymbal and a prism protection sheet, wherein the cymbal has a slab for gathering upward. a layer of light that is directed downward, leftward, and toward the right direction of 5 to increase brightness; and the prism protective sheet is used to protect the layer and widen the viewing angle. In the enamel protection sheet, when the haze of the protective layer (5003) in contact with the prism is increased, the upper protective layer may wear the tip of the ruthenium due to friction with the tip of the cymbal. In order to effectively overcome such a problem, a backlight module assembly having a flexible enamel enamel is provided. Please refer to the ninth figure 'elastic cymbal (1004) including a base film, and a ruthenium layer formed on one surface of the base film, wherein the ruthenium layer is made of an elastic polymer material' and A polymer material having an elastic modulus of from 0 05 to 15 1 〇〇 kg/mm 2 is preferred. When the elastic modulus of the ruthenium layer is within the foregoing range, the flexibility and rigidity of the material are appropriate, thereby avoiding damage to the mountain-shaped prism. In the prism sheet, the polymer material for the enamel layer is not particularly limited as long as it is a transparent elastic material and conforms to the aforementioned elastic modulus. Examples of the polymer material include polyurethane, styrene-bmadiene copolymers, polypacrylate, polymethacrylate, polyfluorene. Polymethylmethacrylate, polyethylene terephthalate elastomer 19 1361288, polyisoprene, or polysilicone. The enamel layer comprises a plurality of three-dimensional structures arranged in a repeating pattern, and the three-dimensional structure has a triangular or polygonal cross section, and preferably has a shape of an isosceles right triangle. In the bismuth film, the base film may be the same as or different from the base film of the enamel protection sheet, and examples of the base film of the enamel sheet include polyethylene terephthalate, polynaphthalene Polyethylene naphthalate, polycarbonate (p〇iycarb〇nate), polyphenylene ethylene (卩〇^^丫1^), polymethacrylate (1)〇1) 171 coffee), polymethylmethacrylate, polyacrylate, polyimide, or polyamide. The base film further includes light-diffusing particles, thereby exhibiting a thick chain structure.丨5 In addition to the cymbal and the cymbal protective sheet, the backlight assembly of the present invention may further include other optical sheets typically used for LCDs. For example, according to the types of backlight modules shown in the first to third figures, a light guide plate, a reflection sheet, and a diffusion sheet can be used. However, it is not particularly limited in the present invention. The invention is further understood by the following examples, which are not to be construed as limiting the invention. In the following examples and comparative examples, the cymbals are made from the materials listed below. <Material> 20 1361288 Base film: polyethylene terephthalate film (PET film, Kolon Industries, thickness 188 μηι). Light diffusing particles: polymethylmethacrylate (monodisperse and polydisperse particles). 5 Adhesive resin. Polyacetate or acrylic acid resin (Kelon Industrial). <Method> In order to manufacture a prism protective sheet, a composition solution containing light-diffusing particles and a binder was applied through a gravure coating (gravure coating Vs over one surface of the base film) and then dried at 100 ° C for 3 minutes. To form a surface protective layer H) (the thickness after drying is 5 to 30 μπ〇; thereafter, the protective layer (the contact with the crucible in the same way, and the thickness after drying is 5 to 3 〇隅) ) formed on the other surface of the base film. Mm to 8 and Comparative Examples i to 6: Preparation of Prism Protective Sheet Each of the protective sheets was prepared using the materials and methods described above, and simultaneously as shown in Table 1 of I5 'Adjust the surface protective layer and the haze of the protective layer in contact with the crucible, and measure the haze using a haze meter (model NDH_2_, Nippon Denshoku, Japan) 21 1361288 [Table 1] --- Haze (%) Protective layer in contact with the enamel layer Protective layer in contact with enamel - Surface protective layer 稜鏡 Protective sheet 1 10 5 _ 5 15 2 20 10 10 30 Jtfr Offense 3 30 15 _ 15 45 4 40 20 20 60 Example 5 50 25 25 75 6 60 30 30 90 7 8 5 3 13 8 70 40 30 110 to 1 5 10 -5 15 2 10 20 " -10 30 to 3 15 ~ 30 -15 45 Target 4 20 40 -20 60 Example 5 25 50 -25 75 6 30 60 -30 90 Example 9 to 16 and Comparative Examples 7 to 12 In order to evaluate the performance of each of the protective sheets prepared by the foregoing methods in terms of brightness, viewing angle and contrast, the backlight was assembled in the following manner.

5 module assembly. <Backlight module assembly> Backlight module: 24" direct type backlight module assembly. Diffusion plate + diffuser + cymbal + protective sheet + liquid crystal display module (Liquid Crystal Module, LCM) In the sheet aspect, a prism sheet having a layer of tantalum made of an elastic modulus of 0.1 kg/mm 2 (four) is used. Use BM-7 Hui Shi ▲ 丄 ^ ^ ^ 叶 (luminescence calorimeter, Tokyo Optics) Summer shell size, viewing angle to only ^ Λ and 剐 surface contrast. The measurement results are shown in Table 2 below. 22 1361288 [Table 2]

-~~—~~_"υ:ι_ It is apparent from Table 2 that the haze of the protective layer in contact with the prism is lower than the haze of the surface protective layer (Comparative Examples 7 to 12), The embodiment in which the haze of the protective layer in contact with the ribs is higher than the haze of the surface protective layer (V: J 9 to 16) exhibits a wider viewing angle and a higher contrast. In some examples of Examples 9 to 16 (Examples 9 to 14), the contact layer has a haze of 70%, and the haze of the protective layer is 5 j 6〇%, two The haze difference between the two is 5 to 60%; while the 稜鏡 protective sheet is in the range of 15 to 1%, which is always the same as the brightness of Comparative Examples 7 to 12. SCI24 and Comparative Examples 13 to 18 are assembled with backlight mode L19 into K and Comparative Examples 7 to 12 in the same manner as in addition to using a 15 piece with a modulus of elasticity of 60 15 . The elastic slab of the enamel layer made of the material of the mouth material is measured as the brightness in the same manner as in 23 1361288, and the viewing angle is compared with the front surface. The measurement results are shown in Table 3 below. 'σ : Table 3】

μ is clearly known from Table 3' These results are the same as Examples 9 to 16 and Comparative Examples 7 to 12. When the elastic modulus of the enamel layer increases, the brightness decreases slightly, and the angle of view combines ‘二也丄L η, 曰J曰, plus, and the contrast does not change significantly. Reference example In order to check the degree of layer failure when using a general cymbal sheet instead of an elastic cymbal as a prism sheet, as shown in the tenth figure, the 稜鏡 protection sheet (made up of 3 3) is placed on the prism sheet, in the prism While the protective sheet has a load of 200 grams, the prisms are guaranteed to move 篗 y and ^ ^ ± m. The film is moved to the right at a speed of 500 mm per minute, and then the sweeping 4 + lens is used to observe the edge of the gentleman's electron microscope. The edge of the mirror protection sheet is below and is not used in the eleventh figure. The results obtained are the same as those of the elastic sputum of the first example, as shown in Figure 12. 24 15 1361288 The scanning electron microscope image of Fig. 11 shows that the tip end of the prism is seriously damaged, while the scanning electron microscope image of Fig. 12 shows that the tip of the crucible is not damaged. From this result, it is understood that the example of the optical sheet assembly for the backlight module using the -5 elastic prism sheet is better in terms of avoiding the damage caused by the protective sheet contacted with the crucible.

25 1361288 [Simple description of the diagram] The first picture is a sectional view showing a standard backlight module assembly for a notebook computer; the second picture is a sectional view showing a side-lighting type backlight module assembly. 5 The third figure is a sectional view showing a direct type backlight module assembly; the fourth figure is a sectional view showing a conventional prism protection sheet; and the fifth figure is a sectional view showing another conventional 稜鏡 protection sheet; 6 is a cross-sectional view showing a 稜鏡 protective sheet of the present invention; and a seventh sectional view showing a conventional optical 10-piece assembly for a backlight module, and the eighth drawing is a cross-sectional view showing another A conventional optical sheet assembly for a backlight module; a ninth view is a cross-sectional view showing an optical sheet assembly for a backlight module of the present invention; 15 FIG. 11 is a schematic view showing a prism layer protected by a protective sheet The damage resistance detection test, the eleventh picture shows the scanning electron microscope image, showing the damage of the general bracts protected by the protective sheet in the optical sheet assembly for the backlight module; and 20 twelfth The figure shows a scanning electron microscope image showing the case where the elastic cymbal protected by the protective sheet is not damaged in the optical sheet assembly for the backlight module. 26 1361288 2 light guide 3' diffuser 5 protective sheet

[Main component symbol description] 1 reflection month 3 diffusion sheet 4, 4' prism sheet 6 lamp tube 50, 50' light diffusion particle 51, 501, 5001 base film 52, 502, 5002 second protective layer (upper surface) 53, 503, 5003 a protective layer (layer in contact with the prism, lower surface) 1004 elastic bracts 27

Claims (1)

Patent application scope: 1. The seed protection sheet is in contact with a layer of enamel, the enamel protection sheet comprising: 'a base film; and a protective layer and a surface protective layer in contact with the enamel layer Using a composition comprising light-diffusing particles and an adhesive, respectively formed on two surfaces of the base film; wherein 'the haze of the protective layer in contact with the tantalum layer is higher than the surface-surface protective layer Haze. 2. The protective sheet according to claim 1, wherein the protective layer in contact with the layer has a haze of 10 to 70%; and the surface layer has a haze of 5 to 60. %. 3. The protective layer of the protective sheet 'in which' is in contact with the tantalum layer as described in claim 1 or 2 of the patent application has a haze difference of 5 to 60% with the surface protective layer. 4. The protective sheet as described in item 1 or 2 of the patent application has a haze of 15 to 1 〇〇〇/0. 5. The protective sheet according to item 3 of the patent application has a haze of 15 to 1%. 6. A backlight module assembly comprising the protective sheet as described in claim 1 of the patent application. 7. A backlight module assembly comprising: at least one prism sheet, the cymbal sheet comprising a base film and a ruthenium layer, and the ruthenium layer is formed using a light transmissive elastic polymer material a surface of one of the base films, and the enamel layer has a plurality of 1361288 three-dimensional structures arranged in a repeating pattern, and a prism protective sheet is in contact with the prism layer; the enamel protection sheet has a base film, and a The protective layer in contact with the germanium layer and a surface protective layer are formed on the two surfaces of the base film of the prism protective sheet by using a composition containing light diffusing particles and an adhesive, respectively;稜鏡 layer. The haze of the protective layer in contact is higher than the haze of the surface protective layer. 8. The backlight module assembly of claim 7, wherein the protective layer of the protective sheet in contact with the layer of germanium has a haze of 10 to 70%, and the The surface protective layer of the prism protective sheet has a haze of 5 to ίο 60%. 9. The backlight module assembly of claim 7 or 8, wherein the haze between the protective layer and the surface protective layer in contact with the prism layer in the protective sheet The difference is 5 to 60%. 10. The backlight module of claim 7 or claim 8 wherein the protective sheet has a haze of 15 to 100%. 11. The backlight module assembly of claim 9, wherein the sigma 13⁄4 protective sheet has a haze of 15 to loo%. The backlight module assembly of the seventh aspect of the invention, wherein the elastic layer of the enamel layer of the prism sheet is (10) to (10)_m2. 20 / = Please refer to the backlight module described in item 7 or item i2 of the patent range. The layer of the layer of the film is made of one or more materials selected from the group consisting of: poly = methyl propyl (4) A 曰 曰, polyethylene terephthalate body, polyisoprene 29 1361288 olefin and polyoxyalkylene.