阅读说明：本技术 一种高回弹与高辉度的增亮膜 (Brightness enhancement film with high resilience and high brightness ) 是由 季文静 丁利明 翟才金 于 2021-01-05 设计创作，主要内容包括：本发明公开了一种高回弹与高辉度的增亮膜,包括依次排列的棱镜层、基材层、背涂结构层,棱镜层包括第一棱镜结构、第二棱镜结构,第一棱镜结构的棱镜的横截面为三角形,第二棱镜结构的棱镜均匀排列于第一棱镜结构的各个棱镜之间,第二棱镜结构每个棱镜的上部都设置有2个上棱角,第一棱镜结构的最高处与上棱角的最高处平齐。本发明通过上述设计,可以使增亮膜的回弹更快、辉度更高、制备方法更简便。(The invention discloses a high-resilience and high-brightness enhancement film which comprises a prism layer, a substrate layer and a back coating structure layer which are sequentially arranged, wherein the prism layer comprises a first prism structure and a second prism structure, the cross section of a prism of the first prism structure is triangular, prisms of the second prism structure are uniformly arranged among the prisms of the first prism structure, the upper part of each prism of the second prism structure is provided with 2 upper edge angles, and the highest part of the first prism structure is flush with the highest part of the upper edge angles. Through the design, the invention can ensure that the rebound of the brightness enhancement film is faster, the brightness is higher and the preparation method is simpler and more convenient.)

1. A high-resilience and high-brightness enhancement film is characterized in that: including prism layer (1), substrate layer (2), the back of arranging in proper order scribble structural layer (3), prism layer (1) includes first prism structure (11), second prism structure (12), the cross section of the prism of first prism structure (11) is triangle-shaped, the prism align to grid of second prism structure (12) in between each prism of first prism structure (11), the upper portion of every prism of second prism structure (12) all is provided with 2 and goes up edges and corners (121), the highest point of first prism structure (11) with go up the highest point parallel and level of edges and corners (121), its preparation method is as follows:

s1: taking a polyester film with the thickness of 188-250 microns as a base material layer (2), and manufacturing a back coating structure layer (3) on the lower surface of the polyester film;

s2: taking a stainless steel roller blank A with copper plated on the surface, engraving the stainless steel roller blank A by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the first prism structure (11) to obtain a prism processing roller A;

s3: stirring acrylic resin A, polyurethane acrylate oligomer A and photosensitizer A in a vacuum cavity at a rotating speed of 1500 rpm-2000 rpm according to a weight ratio of 50:45:5, obtaining prism glue A after stirring, coating the prism glue A on the upper surface of the polyester film, then pressing the prism glue A by using a prism processing roller A, and carrying out UV curing to obtain the first prism structure (11), wherein the cross section of a prism of the first prism structure (11) is triangular;

s4: taking a stainless steel roller blank B with copper plated on the surface, engraving the stainless steel roller blank B by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the second prism structure (12) to obtain a prism processing roller B;

s5: stirring acrylic resin B, polyurethane acrylate oligomer B and photosensitizer B in a vacuum cavity at a rotating speed of 1500-2000 rpm according to a weight ratio of 45:50:5, obtaining prism glue B after stirring, coating the prism glue B between prisms of the first prism structure (11) to a coating thickness which is the same as the height of the first prism structure (11), then pressing the area between the prisms of the first prism structure (11) by using a prism processing roller B, and carrying out UV curing to obtain a second prism structure (12), wherein the upper part of each prism of the second prism structure (12) is provided with 2 upper edge angles (121), so that the preparation of the brightness enhancement film with high resilience and high luminance is completed.

2. The film of claim 1, wherein: the width of the bottom edge of the prism of the first prism structure (11) is 25-70 μm, and the height of the prism of the first prism structure (11) is 12-34 μm.

3. The film of claim 1, wherein: the height of the upper edge angle (121) is H1, H1 is more than or equal to 5 mu m and less than or equal to 8 mu m, the width of the bottom edge of the upper edge angle (121) is W, and W is more than or equal to 5 mu m and less than or equal to 11 mu m.

4. The film of claim 1, wherein: in step S3, the refractive index of prism glue a is 1.53.

5. The film of claim 1, wherein: in step S5, the refractive index of prism glue B is 1.58.

6. The film of claim 1, wherein: the second prism structure (12) is further provided with hemispheroid structures (122) at intervals, the arc angle of each hemispheroid structure (122) is 120-130 degrees, the height of each hemispheroid structure (122) is H2, and H2 is 1-3 mu m higher than that of the first prism structure (11).

7. The film of claim 1, wherein: the cross section of the prism of the first prism structure (11) is a right triangle.

8. The film of claim 1, wherein: the cross section of the upper corner (121) is a right-angled triangle.

Technical Field

The invention relates to the technical field of brightness enhancement films, in particular to a brightness enhancement film with high resilience and high luminance.

Background

At present, a backlight module in the market generally needs to be assembled by a plurality of prisms, but the plurality of prisms are easily scratched in the assembling process, so that the luminance of the backlight module is low. On the other hand, most of the brightness enhancement films in the market are ordinary prism structures, and the other more complex brightness enhancement film structures can meet the luminance requirement of the backlight module, but the processing technology is more complex. Improvements are needed.

Disclosure of Invention

Aiming at the defects of low luminance, complex processing technology and the like of a backlight module of a brightness enhancement film in the prior art, the invention provides a novel brightness enhancement film with high resilience and high luminance.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the utility model provides a high brightness enhancement film who kick-backs and high luminance, is including prism layer, substrate layer, the back-coating structural layer that arranges in proper order, the prism layer includes first prism structure, second prism structure, the cross section of the prism of first prism structure is triangle-shaped, the prism align to grid of second prism structure in between each prism of first prism structure, the upper portion of every prism of second prism structure all is provided with 2 and goes up the edges and corners, the highest point of first prism structure with go up the highest point parallel and level of edges and corners, its preparation method is as follows:

s1: taking a polyester film with the thickness of 188-250 microns as a base material layer, and manufacturing a back coating structure layer on the lower surface of the polyester film;

s2: taking a stainless steel roller blank A with copper plated on the surface, carving the stainless steel roller blank A by using an ultra-precise carving machine to carve a structure with the shape opposite to that of the first prism structure, and obtaining a prism processing roller A;

s3: stirring acrylic resin A, polyurethane acrylate oligomer A and photosensitizer A in a vacuum cavity at a rotating speed of 1500 rpm-2000 rpm according to a weight ratio of 50:45:5 to obtain prism glue A after stirring, coating the prism glue A on the upper surface of the polyester film, then pressing the prism glue A by using a prism processing roller A and carrying out UV curing to obtain the first prism structure, wherein the cross section of a prism of the first prism structure is triangular;

s4: taking a stainless steel roller blank B with copper plated on the surface, engraving the stainless steel roller blank B by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the second prism structure, and obtaining a prism processing roller B;

s5: stirring acrylic resin B, polyurethane acrylate oligomer B and photosensitizer B in a vacuum cavity at a rotating speed of 1500-2000 rpm according to a weight ratio of 45:50:5, obtaining prism glue B after stirring, coating the prism glue B between prisms of the first prism structure, wherein the coating thickness is the same as the height of the first prism structure, then pressing the area between the prisms of the first prism structure by using a prism processing roller B, and carrying out UV curing to obtain a second prism structure, wherein the upper part of each prism of the second prism structure is provided with 2 upper edge angles, so that the preparation of the brightness enhancement film with high resilience and high luminance is completed.

The prism layer is used for improving the overall brightness of the brightness enhancement film, so that the generation of molar grains is avoided, and the resilience of the brightness enhancement film is faster. The substrate layer adopts polyester film, has improved brightness enhancement film's luminousness and has strengthened whole deflection. The back coating structure layer has the function of adhesion prevention, and the atomization effect of the brightness enhancement film is improved. The first prism structure is used for gathering light rays, so that the overall brightness of the brightness enhancement film is higher. The second prism structure has the function of avoiding the generation of Moire patterns, so that the rebound of the brightness enhancement film is faster, and the compression resistance and the scratch resistance are better. The cross section of the prism of the first prism structure is designed to be triangular, so that the light condensation effect of the prism is better, the reflection times are reduced, and the overall brightness of the brightness enhancement film is improved. The 2 upper corners allow the brightness enhancement film to rebound faster. The interval sets up first prism structure, second prism structure, has not only guaranteed the spotlight effect, makes brightness enhancement film's whole luminance higher, still makes brightness enhancement film's resilience faster. The highest position of the first prism structure is flush with the highest position of the upper edge angle, so that the brightness of the brightness enhancement film is higher, and light is fully utilized. Step S1 is to make the anti-blocking function of the brightness enhancement film better and the atomization effect of the brightness enhancement film better by making a back coating structure layer. Step S2 uses an ultra-precision engraving machine to make the engraving precision of the prism processing roller a higher and the deviation smaller, so that the uniformity of the brightness enhancement film is higher. Step S3 uses prism processing roller a for stitching and curing, which results in a higher precision of the first prism structure. Step S4 is an ultra-precision engraving machine to make the engraving precision of the prism processing roller B higher and the deviation smaller, so that the brightness enhancement film has higher uniformity. Step S5 uses prism processing roller B to nip and cure, making the precision of the second prism structure higher. Through the design, the invention can ensure that the rebound of the brightness enhancement film is faster, the brightness is higher and the preparation method is simpler and more convenient.

Preferably, in the brightness enhancement film with high resilience and high luminance, the width of the base edge of the prism of the first prism structure is 25 to 70 μm, and the height of the prism of the first prism structure is 12 to 34 μm.

Through the design, the brightness of the brightness enhancement film is higher, the rebound resilience is stronger, and the pressure resistance is better.

Preferably, the brightness enhancement film with high resilience and high luminance has a height of the upper edge angle H1, a width of the bottom edge of the upper edge angle W, and a width of the bottom edge of the upper edge angle W, wherein the height of the upper edge angle is H1-8 μm, and the width of the bottom edge of the upper edge angle W is 5 μm-11 μm.

Through the design, the brightness of the brightness enhancement film is higher, the rebound resilience is stronger, and the pressure resistance is better.

Preferably, in step S3, in the brightness enhancement film with high resilience and high luminance, the refractive index of the prism glue a is 1.53.

The refractive index of the prism glue A is 1.53, so that the refractive index of the first prism structure is ensured, the cost is reduced, and the applicability of the invention is improved.

Preferably, in step S5, in the brightness enhancement film with high resilience and high luminance, the refractive index of the prism glue B is 1.58.

The refractive index of the prism glue B is 1.58, so that the refractive index of the second prism structure is high, the reflection loss is reduced, and the luminance of the brightness enhancement film is further improved.

Preferably, in the brightness enhancement film with high resilience and high luminance, the second prism structure further comprises a hemisphere structure arranged at an interval, the arc angle of the hemisphere structure is 120 to 130 °, the height of the hemisphere structure is H2, and H2 is 1 to 3 μm higher than the height of the first prism structure.

The hemispherical structure enables the brightness enhancement film to have scratch resistance, and also enables a light source reflected by the brightness enhancement film to be soft, so that the brightness enhancement film has a certain diffusion effect, and the production efficiency of the brightness enhancement film is improved. The scratch resistance of the brightness enhancement film is further improved by the high design of the hemispheroid structure.

Preferably, in the brightness enhancement film with high resilience and high luminance, the cross section of the prism of the first prism structure is a right triangle.

The cross section of the prism of the first prism structure is designed into a right-angled triangle, so that the light condensation effect of the prism is better.

Preferably, in the brightness enhancement film with high resilience and high luminance, the cross section of the upper corner is a right triangle.

The cross section of the upper edge is designed into a right triangle, so that the light condensation effect of the upper edge is better.

Drawings

FIG. 1 is a first schematic structural diagram of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a second schematic structural view of the present invention;

fig. 4 is a partially enlarged view of a portion B in fig. 3.

Detailed Description

The invention will be described in further detail below with reference to the accompanying figures 1-4 and the detailed description, but they are not intended to limit the invention:

example 1

The utility model provides a high brightness enhancement film that kick-backs and high luminance, is including prism layer 1, substrate layer 2, the back coating structural layer 3 that arranges in proper order, prism layer 1 includes first prism structure 11, second prism structure 12, the cross section of first prism structure 11's prism is triangle-shaped, second prism structure 12's prism align to grid in between each prism of first prism structure 11, the upper portion of each prism of second prism structure 12 all is provided with 2 and goes up edges and corners 121, the highest point of first prism structure 11 with go up the highest point parallel and level of edges and corners 121, its preparation method is as follows:

s1: taking a 188-micrometer-thick polyester film as a substrate layer 2, and manufacturing a back coating structure layer 3 on the lower surface of the polyester film;

s2: taking a stainless steel roller blank A with copper plated on the surface, engraving the stainless steel roller blank A by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the first prism structure 11 to obtain a prism processing roller A;

s3: stirring acrylic resin A, polyurethane acrylate oligomer A and photosensitizer A in a vacuum cavity at a rotating speed of 1500rpm according to a weight ratio of 50:45:5, obtaining prism glue A after stirring, coating the prism glue A on the upper surface of the polyester film, then pressing the prism glue A by using a prism processing roller A, and carrying out UV curing to obtain the first prism structure 11, wherein the cross section of a prism of the first prism structure 11 is triangular;

s4: taking a stainless steel roller blank B with copper plated on the surface, engraving the stainless steel roller blank B by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the second prism structure 12 to obtain a prism processing roller B;

s5: stirring acrylic resin B, polyurethane acrylate oligomer B and photosensitizer B in a weight ratio of 45:50:5 in a vacuum cavity at a rotating speed of 1500rpm to obtain prism glue B after stirring, coating the prism glue B between prisms of the first prism structure 11 to a coating thickness which is the same as the height of the first prism structure 11, then pressing the area between the prisms of the first prism structure 11 by using a prism processing roller B and carrying out UV curing to obtain a second prism structure 12, wherein the upper part of each prism of the second prism structure 12 is provided with 2 upper edge angles 121, so that the preparation of the high-resilience and high-luminance brightness enhancement film is completed.

Preferably, the base width of the prisms of the first prism structure 11 is 25 μm, and the height of the prisms of the first prism structure 11 is 12 μm.

Preferably, the height of the upper corner 121 is H1, H1 is 5 μm, the width of the bottom side of the upper corner 121 is W, and W is 5 μm.

Preferably, in step S3, the refractive index of prism glue a is 1.53.

Preferably, in step S5, the refractive index of prism glue B is 1.58.

Preferably, the second prism structures 12 are further provided with hemispherical structures 122 at intervals, the arc angle of the hemispherical structures 122 is 120 °, the height of the hemispherical structures 122 is H2, and H2 is 1 μm higher than the height of the first prism structure 11.

Preferably, the cross section of the prism of the first prism structure 11 is a right triangle.

Preferably, the cross section of the upper corner 121 is a right triangle.

Example 2

The utility model provides a high brightness enhancement film that kick-backs and high luminance, is including prism layer 1, substrate layer 2, the back coating structural layer 3 that arranges in proper order, prism layer 1 includes first prism structure 11, second prism structure 12, the cross section of first prism structure 11's prism is triangle-shaped, second prism structure 12's prism align to grid in between each prism of first prism structure 11, the upper portion of each prism of second prism structure 12 all is provided with 2 and goes up edges and corners 121, the highest point of first prism structure 11 with go up the highest point parallel and level of edges and corners 121, its preparation method is as follows:

s1: taking a polyester film with the thickness of 250 mu m as a substrate layer 2, and manufacturing a back coating structure layer 3 on the lower surface of the polyester film;

s2: taking a stainless steel roller blank A with copper plated on the surface, engraving the stainless steel roller blank A by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the first prism structure 11 to obtain a prism processing roller A;

s3: stirring acrylic resin A, polyurethane acrylate oligomer A and photosensitizer A in a vacuum cavity at a rotating speed of 2000rpm according to a weight ratio of 50:45:5, obtaining prism glue A after stirring, coating the prism glue A on the upper surface of the polyester film, then pressing the prism glue A by using a prism processing roller A, and carrying out UV curing to obtain the first prism structure 11, wherein the cross section of a prism of the first prism structure 11 is triangular;

s4: taking a stainless steel roller blank B with copper plated on the surface, engraving the stainless steel roller blank B by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the second prism structure 12 to obtain a prism processing roller B;

s5: stirring acrylic resin B, polyurethane acrylate oligomer B and photosensitizer B in a weight ratio of 45:50:5 in a vacuum cavity at a rotating speed of 2000rpm to obtain prism glue B after stirring, coating the prism glue B between prisms of the first prism structure 11 to a coating thickness the same as the height of the first prism structure 11, then pressing the area between the prisms of the first prism structure 11 by using a prism processing roller B and carrying out UV curing to obtain a second prism structure 12, wherein the upper part of each prism of the second prism structure 12 is provided with 2 upper edge angles 121, so that the preparation of the high-resilience and high-brightness enhancement film is completed.

Preferably, the base width of the prisms of the first prism structure 11 is 70 μm, and the height of the prisms of the first prism structure 11 is 34 μm.

Preferably, the height of the upper corner 121 is H1, H1 is 8 μm, the width of the bottom side of the upper corner 121 is W, and W is 11 μm.

Preferably, in step S3, the refractive index of prism glue a is 1.53.

Preferably, in step S5, the refractive index of prism glue B is 1.58.

Preferably, the second prism structures 12 are further provided with hemispherical structures 122 at intervals, the arc angle of the hemispherical structures 122 is 130 °, the height of the hemispherical structures 122 is H2, and H2 is 3 μm higher than the height of the first prism structure 11.

Preferably, the cross section of the prism of the first prism structure 11 is a right triangle.

Preferably, the cross section of the upper corner 121 is a right triangle.

Example 3

The utility model provides a high brightness enhancement film that kick-backs and high luminance, is including prism layer 1, substrate layer 2, the back coating structural layer 3 that arranges in proper order, prism layer 1 includes first prism structure 11, second prism structure 12, the cross section of first prism structure 11's prism is triangle-shaped, second prism structure 12's prism align to grid in between each prism of first prism structure 11, the upper portion of each prism of second prism structure 12 all is provided with 2 and goes up edges and corners 121, the highest point of first prism structure 11 with go up the highest point parallel and level of edges and corners 121, its preparation method is as follows:

s1: taking a polyester film with the thickness of 219 mu m as a substrate layer 2, and manufacturing a back coating structure layer 3 on the lower surface of the polyester film;

s2: taking a stainless steel roller blank A with copper plated on the surface, engraving the stainless steel roller blank A by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the first prism structure 11 to obtain a prism processing roller A;

s3: stirring acrylic resin A, polyurethane acrylate oligomer A and photosensitizer A in a vacuum cavity at a rotation speed of 1750rpm according to a weight ratio of 50:45:5 to obtain prism glue A after stirring is finished, coating the prism glue A on the upper surface of the polyester film, then pressing the prism glue A by using a prism processing roller A and carrying out UV curing to obtain the first prism structure 11, wherein the cross section of a prism of the first prism structure 11 is triangular;

s4: taking a stainless steel roller blank B with copper plated on the surface, engraving the stainless steel roller blank B by using an ultra-precise engraving machine to engrave a structure with the shape opposite to that of the second prism structure 12 to obtain a prism processing roller B;

s5: stirring acrylic resin B, polyurethane acrylate oligomer B and photosensitizer B in a vacuum cavity at a rotation speed of 1750rpm according to a weight ratio of 45:50:5 to obtain prism glue B after stirring, coating the prism glue B between prisms of the first prism structure 11, wherein the coating thickness is the same as the height of the first prism structure 11, then pressing the area between the prisms of the first prism structure 11 by using a prism processing roller B, and carrying out UV curing to obtain a second prism structure 12, wherein the upper part of each prism of the second prism structure 12 is provided with 2 upper edge angles 121, so that the preparation of the high-resilience and high-luminance brightness enhancement film is completed.

Preferably, the base width of the prisms of the first prism structure 11 is 47.5 μm, and the height of the prisms of the first prism structure 11 is 23 μm.

Preferably, the height of the upper corner 121 is H1, H1 is 6.5 μm, the width of the bottom side of the upper corner 121 is W, and W is 8 μm.

Preferably, in step S3, the refractive index of prism glue a is 1.53.

Preferably, in step S5, the refractive index of prism glue B is 1.58.

Preferably, the second prism structures 12 are further provided with hemispherical structures 122 at intervals, the arc angle of the hemispherical structure 122 is 125 °, the height of the hemispherical structure 122 is H2, and H2 is 2 μm higher than the height of the first prism structure 11.

Preferably, the cross section of the prism of the first prism structure 11 is a right triangle.

Preferably, the cross section of the upper corner 121 is a right triangle.

Example 4

The brightness enhancement film with high resilience and high brightness obtained in each example is taken, the brightness enhancement film with high resilience and high brightness of the type KBCO-285N of the existing Kangcheng new composite group Co., Ltd is taken as a comparative example 1, and the brightness, resilience, scratch resistance and hardness performance are tested, wherein the test method comprises the following steps:

firstly, luminance testing: 3 brightness enhancement films obtained in example 1, example 2 and example 3 and a4 samples of the brightness enhancement film of comparative example 1 were taken, and four corners and a center point of each a4 sample were measured using a BM-7A brightness tester, and the brightness average of the 4 samples was collected and calculated.

II, rebound testing: 3 specimens A4 of the brightness enhancement films obtained in examples 1, 2 and 3 and the brightness enhancement film of comparative example 1 were taken, and a model YH-9600 resistant grinder was used, a 50g weight was placed thereon, the number of rubs was set to 1, and the average value of the damage recovery time of the 4 specimens was measured and collectively calculated.

Thirdly, scratch resistance test: 3 pieces of each of the brightness enhancement films obtained in examples 1, 2 and 3 and A4 of the brightness enhancement film in comparative example 1 were taken, a diffusion sheet of CDX-131 type was cut into 40 mm. times.40 mm using a model YH-9600 Mill, and the number of times of rubbing was set to 5, and the samples were tested by the test method in T/ZZB1939-2020 prism-free optical brightness enhancement film for liquid crystal display, and the average value of the scratch resistance weights of the 4 samples was collected and calculated.

Fourthly, testing hardness: 3 specimens A4 of the brightness enhancement films obtained in examples 1, 2 and 3 and the brightness enhancement film of comparative example 1 were each transferred by a pencil holder weighing 500g at an arbitrary speed in the interval of 0.5cm/s to 1cm/s over the surface of the specimen by a distance of 7cm, each time at the same speed, and the surface of each specimen was tested in the pencil holder using four hardness grades of 6B, 5B, 4B, 3B, 2B, HB, F, H, 2H, 3H, 4H, 5H and 6H, respectively. The pencil black line is formed by moving, and whether scratches appear or not is observed after the pencil black line is lightly wiped by an eraser. The highest pencil hardness rating in the case of no scratch was summarized and recorded. If the results of the scratch-free highest pencil hardness grades tested by the same sample are different, the lowest pencil hardness grade in the results of the same sample is taken.

The performance test parameters of the high-resilience and high-brightness enhancement film obtained in each example of the invention and the comparative example 1 are shown in table 1:

TABLE 1

Sample (I)	Test one	Test two	Test three	Test four
					Example 1	125％	2s	2200g	H
Example 2	120％	3s	2200g	H
					Example 3	130％	1s	2500g	2H
Comparative example 1	100％	5s	1500g	F

In summary, the above-mentioned embodiments are only preferred embodiments of the present invention, and all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the present invention.