CN112147726A

CN112147726A - Novel quadrangular frustum pyramid brightness enhancement film, application thereof and fusible structured adhesive tape

Info

Publication number: CN112147726A
Application number: CN202010587967.XA
Authority: CN
Inventors: 唐海江; 夏寅; 陈建文; 钟林; 陈强; 刘建凯; 李刚; 张彦
Original assignee: Ningbo Exciton Technology Co Ltd
Current assignee: Ningbo Exciton Technology Co Ltd
Priority date: 2019-06-28
Filing date: 2020-06-24
Publication date: 2020-12-29
Anticipated expiration: 2040-06-24
Also published as: CN112147726B; CN213544869U; CN112147725A; CN211577467U

Abstract

The invention relates to a novel optical film, in particular to a novel quadrangular frustum pyramid brightness enhancement film and application thereof, and a fusible structured adhesive tape. In order to solve the problem that the definition of a display device is reduced after two layers of parts needing to be aligned and matched with each other are aligned and attached by a structural adhesive tape, the invention provides a novel quadrangular frustum pyramid brightness enhancement film, application thereof and a fusible structural adhesive tape. The brightness enhancement film sequentially comprises a substrate layer, a structural layer and an inverted structure release film; the material of the structural layer is selected from adhesive; the structural layer comprises a meat thickness and quadrangular frustum pyramid, the bottom surface of the quadrangular frustum pyramid is connected with the upper surface of the meat thickness, and the quadrangular frustum pyramid is arranged at intervals; the curing degree of the adhesive is 30-50%. When the reverse structure release film is torn, the quadrangular frustum pyramid of the structure layer can deform and is fused with the thick meat layer to form a flat layer. This product is with two novel four terrace with edge brightness enhancement film accurate counterpoint laminating backs, and the four terrace with edge of structural layer fuses integratively with the thick layer of meat, has improved display device's definition.

Description

Novel quadrangular frustum pyramid brightness enhancement film, application thereof and fusible structured adhesive tape

Technical Field

The invention relates to a novel optical film, in particular to a novel quadrangular frustum pyramid brightness enhancement film which is two-dimensionally arranged at intervals and is transparent to collimated light, application thereof and a fusible structured adhesive tape.

Background

Liquid Crystal display (lcd) is the most common display technology at present, and a backlight unit (blu) is required to provide a high-brightness and uniform Light source to achieve the display effect. The BLU includes three main optical sheets, a reflective film, a diffuser film, and a brightness enhancement film.

The diffusion film dif (diffuser) mainly plays a role of light evening in the BLU, and is disposed below the brightness enhancement film to provide a uniform surface light source. The brightness Enhancement film BEF (Brightness Enhancement film) mainly plays a role of light condensation in the BLU, is arranged above the diffusion sheet, and is used for re-converging uniform light rays provided by the diffusion sheet into a central visual angle (generally within 35 degrees of a normal angle with a light emitting surface), so that the luminous intensity and the front brightness in the normal direction can be remarkably improved.

The traditional brightness enhancement film is generally a prism structure (triangular prism) array which is closely arranged, the cross section of the traditional brightness enhancement film is generally triangular, and through the side refraction and total reflection of light rays on the prism structure and multiple times of refraction between adjacent prism structures, the front view accumulation effect and the recycling effect of the light rays are generated, so that the control of the emergence angle of most of the light rays is realized. Since the optical principle of brightness enhancement relies entirely on the prismatic structures themselves, the prismatic structures of conventional brightness enhancement films are closely packed (as shown in FIG. 1) without gaps to maximize brightness.

However, the structural design of such conventional brightness enhancement films is not really flexible enough and in some cases suffers from application limitations: when parallel light rays need to pass through the prism structure from top to bottom or from bottom to top, the light rays are necessarily deflected due to the absence of the inclined plane, and the collimation of the light rays is damaged (as shown in fig. 2); conventional brightness enhancement films are very poor if evaluated for their transmittance of collimated light, which is typically less than 1%, especially for two brightness enhancement films that are orthogonal, where the collimated transmittance is even close to 0.

At present, in the equipment that has pattern recognition, especially fingerprint identification's liquid crystal display equipment, when the reflection collimation light (fingerprint pattern) from the fingerprint from the top propagates, need keep the collimation nature as far as possible and pass all kinds of optical film materials, just enable the fingerprint identification module and can receive the specific light signal (like the infrared light) of sufficient intensity, reach the formation of image requirement of fingerprint identification module, finally realize the analysis and the identification of fingerprint pattern.

Obviously, in such an application, the conventional brightness enhancement film has a serious short plate which cannot allow collimated light to pass through, and cannot meet the requirement of the collimated light transmittance required by imaging.

Therefore, in view of the above problems, there is a need for further solutions to develop new types of quadrangular frustum brightness enhancement films that are transparent to collimated light.

Disclosure of Invention

The invention provides a novel quadrangular frustum pyramid brightness enhancement film and a preparation method thereof, aiming at solving the problem that the existing brightness enhancement film cannot allow collimated light to pass through. The four-edge table of the brightness enhancement film provided by the invention is arranged at intervals in two dimensions, collimated light can penetrate through the film, and the novel four-edge table brightness enhancement film has better collimated light penetration performance.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention provides a novel quadrangular frustum pyramid brightness enhancement film which comprises a substrate layer and a structural layer, wherein the structural layer is arranged on the substrate layer, the structural layer comprises a plurality of quadrangular frustums which are arranged at intervals, and areas among the quadrangular frustums are called as interval areas. The bottom surface of the quadrangular frustum is positioned above the base material layer.

The upper surface of the quadrangular frustum pyramid is a platform area (platform for short), and the platform area is flat and smooth; the quadrangular frustum pyramid forms a matrix.

The upper surface and the bottom surface of the quadrangular frustum are parallel.

The quadrangular frustum pyramid is arranged at intervals in two dimensions and is not connected with each other. The spacing area is flat and smooth, and collimated light can penetrate through the spacing area. The cross section and the longitudinal section of the quadrangular frustum are both trapezoidal, the bottom surface and the upper surface of the quadrangular frustum are both rectangular (the rectangle comprises a square), the upper surface of the quadrangular frustum is a platform area, the platform area is flat and smooth, collimated light can penetrate through the platform area, the side surface of the quadrangular frustum is limited in a space directly above the bottom surface except the upper surface, the collimated light penetrating through the spacing area and the platform area can not be blocked, the bottom surface and the base material of the quadrangular frustum are always parallel, the bottom surface and the bottom surface are always parallel, the cross sections of the quadrangular frustum are always parallel, and the longitudinal sections are always parallel.

The virtual oblique extension lines of the four edges of the quadrangular frustum pyramid are provided with virtual intersection points above the platform, the virtual intersection points and the platform form a virtual quadrangular pyramid, and the vertical foot of the virtual intersection points on the platform forms a vertical line to the bottom surface, namely the vertical center of the quadrangular frustum pyramid is high.

Here, the longitudinal section of the quadrangular frustum is a longitudinal section passing through the virtual intersection point, and the cross section of the quadrangular pyramid is a cross section passing through the virtual intersection point.

The projection of the platform of the quadrangular frustum pyramid on the bottom surface is also rectangular, and the sides of the projection rectangle are respectively parallel to the corresponding sides of the bottom surface rectangle. The projection rectangle is positioned in the bottom rectangle.

The cross section and the longitudinal section of the quadrangular frustum are respectively parallel to the two pairs of bottom edges and respectively intersected with the two pairs of side surfaces, and the cross section and the longitudinal section of the quadrangular frustum are vertically intersected at the vertical center height.

The included angles between the left inclined plane and the right inclined plane of the single quadrangular frustum pyramid and the longitudinal section, namely the included angles between the left inclined plane and the right inclined plane of the trapezoid of the cross section and the height of the vertical center are respectively alpha₁、β₁，α₁、β₁All angles are 15-75 degrees; the included angles between the front inclined plane and the rear inclined plane of the single quadrangular frustum pyramid and the cross section, namely the included angles between the left inclined plane and the right inclined plane of the trapezoid of the longitudinal section and the height of the vertical center are respectively alpha₂、β₂，α₂、β₂All 15-75 degrees.

Further, a of a single quadrangular frustum₁、β₁May be the same or different, alpha₂、β₂May be the same or different. In order to reduce the difficulty in realizing the process, improve the luminance and control the viewing angles to be symmetrical, the preferred viewing angles are the same, and at the moment, the trapezoid of the cross section and the trapezoid of the longitudinal section are both isosceles trapezoids.

Further, a of a plurality of quadrangular frustums₁May be the same or different, beta₁And may be the same or different, a₂May be the same or different, beta₂And may be the same or different. In order to reduce the difficulty of process implementation, the same is preferred.

Further, α₁And beta₁Is a sum of₁，θ₁30 to 150 degrees; alpha is alpha₂And beta₂Is a sum of₂，θ₂Is 30 to 150 degrees.

Further, the method can be used for preparing a novel materialOf different quadrangular frustum of a pyramid₁May be the same or different, theta₂And may be the same or different. In order to reduce the difficulty of process implementation, the same is preferred.

The vertical center height H of the single quadrangular frustum pyramid is 5-100 mu m.

Further, the vertical center heights of the quadrangular frustum pyramid can be the same or different. To reduce the difficulty of implementing the process, it is preferable that the two or more portions are the same, such as one high, one low, one high, and one high.

The rectangular area of the bottom surface of the single quadrangular frustum pyramid is S₂。

The height of the virtual rectangular pyramid is G, G can be regarded as a vertical extension line of H, the vertical extension magnification is t, G is t multiplied by H, and the value range of t is [0.01,100 ]]The rectangular area of the platform region is S₁，S₁＝S₂X t/(1+ t), side projection square ring area S₄＝S₂-S₁＝S₂/(1+t)。

The periphery of the single quadrangular frustum pyramid is provided with square rings in interval areas, the square rings in the interval areas can be seen as the result of virtual expansion of the bottom surface to the periphery, and the transverse expansion multiplying power along the cross section direction is k₁A longitudinal expansion ratio in the longitudinal sectional direction of k₂，k₁、k₂Has a value range of [0.01,10 ]]The expanded rectangular area is S₃＝S₂×(1+k₁)×(1+k₂) The square ring area of the spacer region is S₅，S₅＝S₃-S₂＝S₂×(k₁×k₂+k₁+k₂)。

The transverse width of the platform rectangle of the single quadrangular frustum pyramid is L₁，L₁＝[tan(α1)+tan(β1)]X G, the transverse width of the bottom rectangle is W₁，W₁＝[tan(α₁)+tan(β₁)]X (H + G) and the transverse width of the expanded rectangle is P₁，P₁＝W₁×(1+k₁)。

The longitudinal width of the platform rectangle of the single quadrangular frustum pyramid is L₂，L₂＝[tan(α₂)+tan(β₂)]X G, the longitudinal width of the bottom rectangle is W₂，W₂＝[tan(α₂)+tan(β₂)]X (H + G) and the longitudinal width of the expanded rectangle is P₂，P₂＝W₂×(1+k₂)。

Further, adjacent square rings of the spacing region are connected.

The interval region and the platform region are smooth, and the smooth surface roughness Ra is less than or equal to 250nm, further<250 nm. The actual value of the transmittance of the collimated light is generally slightly less than the ideal value (S)₁And S₅Sum of S₃Ratio) due to reflection losses in the spacer and plateau regions, and high surface roughness causes surface scattering. To reduce this gap, further, the surface roughness Ra is 100nm or less. Furthermore, the surface roughness Ra is less than or equal to 50 nm.

The quadrangular frustum pyramid is arranged at intervals transversely or longitudinally, if vertexes of vertical center heights of the quadrangular frustum pyramid are respectively connected in the transverse direction and the longitudinal direction to form a virtual connecting line (or called as a virtual track line), the vertical center heights of the quadrangular frustum pyramid are positioned below the transverse or longitudinal virtual connecting line, and the virtual connecting line is selected from one or a combination of at least two of a straight line, a broken line, a curve, an intermittent broken line and an intermittent curve; amplitude A of the horizontal virtual link₁Amplitude A of the vertical virtual line is 0-2 μm₂Is 0-2 μm (as shown in FIGS. 6a and 6b, A in the figure)₁And A₂Both represented by a).

The orthocenter heights of the quadrangular frustum are arranged at intervals in the transverse direction or the longitudinal direction and are limited below by a transverse virtual track line or a longitudinal virtual track line.

The folding line is selected from one or a combination of at least two of a triangle, a trapezoid and a square.

The curve is selected from one of a sine curve and a circular arc curve or a combination of at least two of the sine curve and the circular arc curve.

The intermittent broken lines are the alternate combination of straight lines and broken lines; the intermittent curve is an alternating combination of straight and curved lines.

Amplitude A of the transverse virtual trajectory line₁Amplitude A of the longitudinal virtual trajectory line is 0-2 μm₂Is 0-2 mum。

The thickness of the substrate layer is 10-250 mu m.

A meat thickness layer may be present between the substrate layer and the structural layer. The meat-like layer is produced by filling the polymeric resin between the substrate and the smooth outer surface of the mould (i.e. in correspondence of the spacer regions) during the structuring process, so that a gap is present between the two, the thickness of this gap forming the meat-like layer after curing (as shown in figure 9).

The thickness of the meat-thick layer, namely the thickness of the interval area is 0.1-10 mu m.

The region between the quadrangular frustum pyramid can be a region on the base material layer, and can also be a region on the thick layer.

The projection line segments of the longitudinal section of any quadrangular frustum pyramid on the substrate layer can be connected to form a straight line A, the projection of the end face of the substrate on the substrate layer is a straight line B, and the included angle between the straight line A and the straight line B is called the dislocation angle of the structural layer

Dislocation angle

Is selected from 0 to 90 degrees.

Further, H is 5-100 μm, such as 5, 12, 25, 20, 50, 100 μm.

Further, α₁Is 15-75 °, for example 15 °, 25 °, 35 °, 45 °, 55 °, 65 °, 30 °, 40 °, 50 °, 60 °, 75 °.

Further, β₁Is 15-75 °, for example 15 °, 25 °, 35 °, 45 °, 55 °, 65 °, 30 °, 40 °, 50 °, 60 °, 75 °.

Further, α₂Is 15-75 °, for example 15 °, 25 °, 35 °, 45 °, 55 °, 65 °, 30 °, 40 °, 50 °, 60 °, 75 °.

Further, β₂Is 15-75 °, for example 15 °, 25 °, 35 °, 45 °, 55 °, 65 °, 30 °, 40 °, 50 °, 60 °, 75 °.

Further, k₁Is 0.01-10, such as 0.01, 0.03, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5、0.7、0.8、1、1.2、1.5、2、3、5、10。

Further, k₂From 0.01 to 10, for example 0.01, 0.03, 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.7, 0.8, 1, 1.2, 1.5, 2, 3, 5, 10.

Further, t is 0.01-100, such as 0.01, 0.03, 0.05, 0.1, 0.2, 0.5, 1, 1.5, 2, 5, 10, 100.

Further, A₁Is 0-2 μm, e.g. 0, 1, 2 μm. Further, A₂Is 0-2 μm, e.g. 0, 1, 2 μm.

Further, in the above-mentioned case,

is 0-90 deg., such as 0 deg., 45 deg., 90 deg..

Further, Ra <250nm, Ra <100nm, Ra <50 nm.

Further, (S)₁+S₅)/S₃0.03-0.99, such as 0.03, 0.08, 0.18, 0.368, 0.54, 0.66, 0.70, 0.88, 0.99.

Further, H is 20-25 μm, alpha₁Is 45 DEG, beta₁Is 45 DEG, alpha₂Is 45 DEG, beta₂Is 45 DEG, k₁Is 0.2, k₂0.2, t 0.1, A₁Is 0-2 μm, A₂Is in the range of 0 to 2 μm,

is 0 DEG, Ra<100nm，(S₁+S₅)/S₃Is 0.368. The foregoing data, corresponding to the examples shown in table 2, can be used to improve the adsorption resistance of the novel quadrangular frustum pyramid brightness enhancement film.

Furthermore, the structural layer is composed of quadrangular frustum pyramid repeating units, the number of types of different quadrangular frustums in the quadrangular frustum pyramid repeating units is called the number of stages, the number of longitudinally arranged quadrangular frustums in one quadrangular frustum pyramid repeating unit is called the number of rows, and the number of transversely arranged quadrangular frustums is called the number of columns. Within a square pyramid repeating unit, the number of levels is 1 or 2 and the number of rows or columns is 1-10, e.g., 1, 2, 3, 5, or 10.

The invention also provides a preparation method of the novel quadrangular frustum pyramid brightness enhancement film, which comprises the following steps:

(1) grinding and polishing the quadrangular frustum pyramid cutter and the mold until the surfaces are flat and smooth, and engraving a mold with a complementary structure according to the quadrangular frustum pyramid structure, the longitudinal and transverse arrangement mode and the depth direction;

(2) filling polymer resin between the mould and the substrate, and micro-copying a structural layer on the substrate layer through molding and demoulding to obtain the novel quadrangular frustum pyramid brightness enhancement film with the collimated light being permeable.

The invention also provides a backlight module which comprises a reflecting film, a light guide plate, a lower diffusion film and a brightness enhancement film, wherein the brightness enhancement film is a brightness enhancement film sheet or a combination of sheets; the cutting angle C of the brightness enhancement film sheet is selected from 0-90 degrees; the brightness enhancement film sheet combination is a combination of at least two sheets.

In the cutting process of the brightness enhancement film, an angle formed by the intersection of the cutting line and the straight line of the end surface of the substrate is called a cutting angle C.

The invention also provides a using method of the novel quadrangular frustum pyramid brightness enhancement film, which comprises a cutting method and an assembling method.

The cutting method comprises the step of die cutting the coiled material into a sheet material with the shape and the size required by assembling the backlight module according to a cutting angle C, wherein C is selected from 0-90 degrees.

The assembling method is selected from one of C-type (single-sheet assembly) and CC-type (two-sheet parallel assembly) precise alignment and sequential stacking on a lower diffusion or light guide plate in the backlight module.

Particularly, in the use process of the novel quadrangular frustum pyramid brightness enhancement film, the strong positive correlation between the luminance loss and the collimation light transmittance is easily found. For example, in the single-sheet use mode of the prior art, which has a large collimation transmittance and a large luminance loss, the precision alignment parallel stacking can keep the collimation transmittance still 'large', but the luminance loss can be improved to 'small', even 'small'.

In the existing brightness enhancement film, a closely-arranged prism structure is adopted, and a smooth interval area and a smooth platform area are not leveled, so that the problem that collimated light cannot penetrate exists.

Compared with the prior art, the novel quadrangular frustum pyramid brightness enhancement film provided by the invention has better collimated light transmission performance. When Ra is small, the actual collimation light transmittance is further improved, but the luminance loss is almost unchanged.

In particular surface microstructures, the conventional prism rib structure is much more widely used than the trapezoidal prism rib structure, however, the trapezoidal prism structure has a flat upper surface, and more applications can be found by using the particular feature. For example, by forming the adhesive into such a structure, the structural characteristics are maintained while maintaining the adhesive tape's conformability (trapezoidal prism ribs are at least surface contact, traditional prism ribs are only line contact). Meanwhile, the space between the inclined planes forms a natural exhaust channel along the direction of the ribs, so that bubbles are not easily generated in the laminating process of the structured adhesive glue. Especially when there is a space between the trapezoidal prism ribs, the exhausting effect becomes better.

At present, most of the application of the adhesive tape, especially in electronic products, not only relates to side sticking, but also relates to frame sticking and surface sticking, so that air exhaust in only a single direction cannot be considered, and air exhaust in at least two directions, namely vertical and horizontal directions, needs to be realized. Therefore, the structure that the adhesive is prepared into the quadrangular frustum pyramid is a better solution, and similarly, when intervals exist among the quadrangular frustum pyramid, the exhaust effect is better.

When two rectangular frustum of a pyramid brightness enhancement films are stacked and assembled, the films are easy to slide and dislocate, and collimated light loss can be generated after dislocation.

The two quadrangular frustum pyramid brightness enhancement films are simply stacked and assembled, namely, the assembly of an independent adhesive layer is not used.

In order to solve the problem that two quadrangular frustum pyramid brightness enhancement films are easy to slide and misplace after being stacked and assembled, the invention provides the following technical scheme.

In the novel quadrangular frustum pyramid brightness enhancement film, the material of the structural layer is selected from an adhesive of an acrylic system, a polyurethane system or an organic silicon system; the structural layer comprises a thick-flesh layer and a plurality of quadrangular frustum pyramid, the bottom surface of the quadrangular frustum pyramid is connected with the upper surface of the thick-flesh layer, the quadrangular frustum pyramid is arranged at intervals, and the area between the quadrangular frustum pyramid is called as an interval area.

The structural layer has the adhesive property of adhesive sticker. When the structural layer in the novel quadrangular frustum pyramid brightness enhancement film is an adhesive and has adhesiveness, the brightness enhancement film can be directly attached to a target, such as another novel quadrangular frustum pyramid brightness enhancement film. An independent adhesive layer is omitted, accurate alignment can be realized, and the collimating and light receiving losses caused by sliding and dislocation are avoided.

Furthermore, in the novel quadrangular frustum pyramid brightness enhancement film, the brightness enhancement film sequentially comprises a substrate layer, a structural layer and an inverted structure release film from bottom to top.

The surface structure of the reverse structure release film is completely complementary with the quadrangular frustum pyramid structure of the structural layer. The surface of the reverse structure release film refers to the surface attached to the structural layer.

Furthermore, in the novel quadrangular frustum pyramid brightness enhancement film, the reverse structure release film is a light release film, and the substrate layer is a heavy release film.

On the other hand, the invention also provides application of the novel quadrangular frustum pyramid brightness enhancement film, and the novel quadrangular frustum pyramid brightness enhancement film is used as an adhesive tape.

The substrate layer of this novel four terrace with edge brightness enhancement film is the substrate that only has the effect of supporting structure layer, and this novel four terrace with edge brightness enhancement film can use for the single face to glue.

The substrate layer when novel four prismatic table brightness enhancement film is heavy type release film, and this novel four prismatic table brightness enhancement film can use for the double faced adhesive tape. When the light release film is used, the light release film is removed, the structural layer is pasted on a target, such as another novel quadrangular frustum pyramid brightness enhancement film, then the heavy release film is removed, and the other side of the structural layer is pasted on another target, such as a diffusion film.

The structural layer with stickability has the same optical function (increase luminance and allow the collimation infrared light to see through) with novel four arriss platform brightness enhancement film simultaneously, can utilize the same structure periodicity simultaneously (as having mark) to carry out the laminating of counterpointing accurately with structured glue film and four arriss platform brightness enhancement film, solved two four arriss platform brightness enhancement film and simply piled up the equipment back, the easy problem of dislocation that slides and produce collimation light loss, this structural layer is owing to have the four arriss platform structures of interval arrangement simultaneously, the air discharge is better.

On the other hand, the invention also provides a structured adhesive tape, which sequentially comprises a bearing layer, a structured adhesive layer and an inverted structure release film, wherein the structured adhesive layer is arranged on the bearing layer, and the inverted structure release film is arranged on the structured adhesive layer; the bearing layer is a base material or a plane separation section, the structured adhesive layer comprises a thick-flesh layer and a plurality of quadrangular frustum pyramid, the bottom surface of the quadrangular frustum pyramid is connected with the upper surface of the thick-flesh layer, the quadrangular frustum pyramid is arranged at intervals, and the area between the quadrangular frustum pyramid is called as an interval area.

Furthermore, the surface structure of the reverse structure release film is completely complementary with the quadrangular frustum pyramid structure of the structured adhesive layer. The surface of the reverse structure release film refers to the surface attached to the structured adhesive layer. The reverse structure release film is also called a grid release film.

When the bearing layer is a base material, the structured adhesive tape is a single-sided adhesive tape, and only one side of the structured adhesive layer can be used for sticking. When the bearing layer is a plane separation section, the structured adhesive tape is a double-sided adhesive tape, and two sides of the structured adhesive tape can be used for sticking.

Further, in the structured adhesive tape, the structures of the release film and the structured adhesive layer are complementary.

Furthermore, in the structured adhesive tape, the interval area is flat and smooth, the upper surface of the quadrangular frustum is a platform area, and the platform area is flat and smooth; the quadrangular frustum pyramid forms a matrix.

Furthermore, in the structured adhesive tape, the structured adhesive layer has all or part of the technical characteristics of the structural layer in the novel quadrangular frustum pyramid brightness enhancement film. The area between the quadrangular frustum pyramid refers to the area on the thick layer of the meat.

Further, the knotIn the structured adhesive tape, the spacing region and the platform region are flat and smooth, and the flat and smooth surface roughness Ra is less than or equal to 250nm, further, Ra<250 nm. The actual value of the transmittance of the collimated light is generally slightly less than the ideal value (S)₁And S₅Sum of S₃Ratio) due to reflection losses in the spacer and plateau regions, and high surface roughness causes surface scattering. To reduce this gap, further, the surface roughness Ra is 100nm or less. Furthermore, the surface roughness Ra is less than or equal to 50 nm.

Furthermore, in the structured adhesive tape, the thickness of the bearing layer is 10-1000 μm, the thickness of the reverse structure release film is 25-250 μm, the thickness of the meat-like layer, namely the thickness of the spacing area, is 0.1-50 μm, and the vertical center height H of the quadrangular frustum pyramid is 3-50 μm.

Furthermore, the thickness of the bearing layer is 10-1000 μm.

Further, the thickness of the reverse structure release film is 25-250 mu m.

Furthermore, the thickness of the meat-thick layer, namely the thickness of the interval area is 0.1-50 μm.

Furthermore, the vertical center height H of a single quadrangular frustum pyramid is selected from 3-50 μm, and the H of different quadrangular frustums is the same.

Further, a of a single quadrangular frustum₁、β₁May be the same or different, alpha₂、β₂May be the same or different. In order to reduce the difficulty of process realization, alpha is preferred₁、β₁、α₂、β₂The cross section trapezoid and the longitudinal section trapezoid are isosceles trapezoids and have the same shape.

The height of the virtual rectangular pyramid is G, G can be regarded as a vertical extension line of H, the vertical extension magnification is t, G is t multiplied by H, and the value range of t is [1,100 ].

The periphery of the single quadrangular frustum pyramid is provided with square rings in interval areas, the square rings in the interval areas can be seen as the result of virtual expansion of the bottom surface to the periphery, and the transverse expansion multiplying power along the cross section direction is k₁A longitudinal expansion ratio in the longitudinal sectional direction of k₂，k₁、k₂Has a value range of [0.1,1 ]]，k₁、k₂Preferably the same.

The material of the structured adhesive layer is selected from an adhesive of an acrylic system, a polyurethane system or an organic silicon system.

When the bearing layer selects a substrate, the structured adhesive tape is actually a single-sided adhesive tape, and the use layer comprises the substrate and the structured adhesive layer; when the bearing layer is a plane release film, the structured adhesive tape is actually a double-sided adhesive tape, and the use layer is a structured adhesive layer.

When the structured adhesive tape is a single-sided adhesive tape, the substrate of the bearing layer is selected from one of a transparent polymer film, a colored polymer film, foam or paper.

When the structured adhesive tape is a double-sided adhesive tape, the plane is separated from the section bar by a heavy separation mode, the reverse structure is separated from the type film by a light separation mode, namely, the reverse structure is separated from the type film by a easier separation mode and the adhesive layer. The plane release profile is selected from one of release film and release paper.

Further, the thickness B of the bearing layer is 10-1000 μm, such as 10 μm, 25 μm, 38 μm, 50 μm, 100 μm, 250 μm, 500 μm, or 1000 μm.

The thickness T of the reverse structure release film is 25-250 μm, such as 25 μm, 38 μm, 50 μm, 100 μm, 188 μm, or 250 μm.

The thickness of the meat-thick layer, i.e. the thickness D of the spacer region, is 0.1 to 50 μm, such as 0.1 μm, 1 μm, 5 μm, 25 μm, or 50 μm.

The vertical center height H of the quadrangular frustum is 3-50 μm, such as 3 μm, 5 μm, 10 μm, 25 μm, or 50 μm.

A of the single quadrangular frustum₁、β₁、α₂、β₂Are all 15-75 degrees, such as alpha₁、β₁、α₂、β₂All 15 degrees, 45 degrees or 75 degrees.

The height of the virtual rectangular pyramid is G, G can be regarded as a vertical extension line of H, the vertical extension magnification is t, G ═ txh, and t has a value range of [1,100], for example, t is 1,10 or 100.

The periphery of the single quadrangular frustum pyramid is provided with square rings in interval areas, and the transverse expansion multiplying power is k₁Longitudinal expansion magnification of k₂Has a value range of [0.1,1 ]]E.g. k₁、k₂All 0.1, 0.2, 0.5 or 1.

Dislocation angle of the structural adhesive layer

Is 0 deg..

Further, the bearing layer is a transparent film.

The invention also provides a method for preparing the structured adhesive tape, which comprises the following steps:

(1) preparing a required positive structure on a version roller, and preparing a reverse structure release film from resin with release performance by adopting a curtain coating process or an ultraviolet curing process;

(2) and coating the adhesive between the bearing layer and the reverse-structure release film to form a sandwich structure, thus preparing the structured adhesive tape.

The structured adhesive layer of this sticky tape has the same optical function (increase luminance and allow the collimation infrared light to see through) with novel four arriss platform brightness enhancement film, can utilize the same structure periodicity simultaneously (as having mark) to carry out the laminating of counterpointing accurately with structured adhesive layer and four arriss platform brightness enhancement film, solve two four arriss platform brightness enhancement film and simply pile up the equipment back, the easy problem of dislocation that slides and produce collimation light loss, this sticky tape is simultaneously owing to have the four arriss platform structures of interval arrangement, the air discharge is better.

The counterpoint laminating of structured glue film and novel four terrace with edge brightness enhancement film is the same with two accurate stack optical effects of four terrace with edge brightness enhancement film, but stability is better.

When the structured adhesive tape is a single-sided adhesive, only the alignment and lamination of the used layer (i.e., the substrate + the structured adhesive layer) and the novel quadrangular frustum pyramid brightness enhancement film can be realized (as shown in fig. 12 a). When the structured adhesive tape is a double-sided adhesive tape, the novel quadrangular frustum pyramid brightness enhancement film can be attached to a diffusion film (as shown in fig. 12 b) or a display panel (as shown in fig. 12 c) while the alignment attachment of the use layer (i.e., the structured adhesive layer) is realized.

Compared with the prior art, the structured adhesive tape provided by the invention has better air exhaust performance and reduces the possibility of generating bubbles in the attaching process. Moreover, the structured adhesive layer and the quadrangular frustum pyramid brightness enhancement film can be accurately aligned and attached, and the problem that two quadrangular frustum pyramid brightness enhancement films are easy to slide and dislocate and cause collimation light loss after being simply stacked and assembled is solved.

In some special applications of display-type electronic products (for example, two new types of quadrangular frustum brightness enhancement films which need to be highly overlapped, a grating structure or a lens of a 3D film needs to be aligned with a Pixel (Pixel) of a panel, a lens or a diaphragm for fingerprint identification needs to be aligned with a sensor (Sens ° r), and the like), a structured adhesive tape is desired, which can be aligned and attached by using a Mark (Mark) and an exhaust function of a periodic structure, and the periodic structure is not desired to reduce the definition of a display device. One approach is to make the scale of the periodic structure very small (e.g., down to a scale of tens of microns from hundreds of microns), however this approach is a geometric progression to processing time and even then haze is still generated. Another way is to make the height of the glue layer very small (e.g. on the scale of a few microns from a few tens to a hundred microns), which is not long but requires very high precision. Therefore, it is necessary to solve this problem and improve the definition of the display device after bonding.

In order to solve the problem that the definition of a display device is reduced after two layers of components (such as two novel quadrangular frustum pyramid brightness enhancement films) which need to be aligned and matched with each other are accurately aligned and attached to the structural adhesive tape, the invention provides a novel quadrangular frustum pyramid brightness enhancement film, application thereof and a fusible structural adhesive tape. According to the product provided by the invention, after two layers of components (such as two novel quadrangular frustum pyramid brightness enhancement films) which need to be aligned and matched with each other are accurately aligned and laminated, the quadrangular frustum pyramid and the thick meat layer of the structural layer are fused into a whole, the definition of a display device is improved, and the problem of reducing the definition of the display device is solved.

In order to solve the above technical problems, the present invention adopts the following technical solutions.

The novel quadrangular frustum pyramid brightness enhancement film provided by the invention sequentially comprises a substrate layer, a structural layer and an inverted structure release film from bottom to top; the material of the structural layer is selected from an acrylic system, a polyurethane system or an adhesive of an organic silicon system; the structural layer comprises a thickness and a plurality of quadrangular frustum pyramid, the bottom surface of the quadrangular frustum pyramid is connected with the upper surface of the thickness, the quadrangular frustum pyramid is arranged at intervals, and the area between the quadrangular frustum pyramid is called as an interval area; the curing degree of the adhesive is 30-50%; the surface structure of the reverse structure release film is completely complementary with the quadrangular frustum pyramid structure of the structural layer.

The surface of the reverse structure release film refers to the surface attached to the structural layer.

Further, when the reverse structure release film is torn, the quadrangular frustum pyramid of the structure layer can deform and is fused with the thick meat layer to form a flat layer.

Furthermore, the quadrangular frustum pyramid structure of the structural layer can disappear automatically and be fused with the thick layer at normal temperature, or under heat or pressure.

The substrate layer when novel four prismatic table brightness enhancement film is heavy type release film, and this novel four prismatic table brightness enhancement film can use for the double faced adhesive tape. When the light release film is used, the light release film is removed firstly, the structural layer is pasted to a target, such as another novel quadrangular frustum pyramid brightness enhancement film, then the heavy release film is removed, and the other surface of the structural layer is pasted to another target, such as a second novel quadrangular frustum pyramid brightness enhancement film.

On the other hand, the invention provides a fusible structured adhesive tape, which sequentially comprises a bearing layer, a structured adhesive layer and an inverted structure release film; the bearing layer is a base material or a plane separation section, the structured adhesive layer comprises a meat thickness and a plurality of quadrangular frustum pyramid, the bottom surfaces of the quadrangular frustum pyramid are connected with the upper surface of the meat thickness, the quadrangular frustum pyramid is arranged at intervals, and the area between the quadrangular frustum pyramid is called as an interval area; the material of the structured adhesive layer is selected from an adhesive of an acrylic system, a polyurethane system or an organic silicon system; the curing degree of the adhesive is 30-50%; the surface structure of the reverse structure release film is completely complementary with the quadrangular frustum pyramid structure of the structured adhesive layer.

Further, when tearing the anti-structure from type membrane, the four arris platforms of structured glue film can warp and fuse together with the thick layer of meat and form a flat bed.

Further, the quadrangular frustum pyramid structure of the structured adhesive layer can disappear automatically and be fused with the thick meat layer at normal temperature or under heat or pressure.

Because the solidification degree of adhesive is 30 ~ 50%, the four terrace with edge structure of structural layer mainly keeps by the complementary structure of anti-structure release film, during the use, tear anti-structure release film, the four terrace with edge structure that utilizes the structural layer is with two-layer parts (for example two novel four terrace with edge brightness enhancement films) of need counterpointing collocation mutually the accurate laminating of counterpointing, afterwards, through certain time, the four terrace with edge structure of structural layer or structured glue film can disappear by oneself, the adhesive that forms the four terrace with edge is in the same place with the adhesive fusion that forms the thickness of meat, the adhesive of structural layer or structured glue film forms a flat structure, this flat structure can not reduce display device's definition.

The shape of the quadrangular frustum pyramid does not need to be maintained by strong cohesive force, the reverse structure release film is torn and then is pasted as soon as possible, and the shape of the quadrangular frustum pyramid does not need to be maintained for a long time.

When the device is used, after two layers of components (such as two novel quadrangular frustum pyramid brightness enhancement films) which need to be aligned and matched with each other are accurately aligned and attached, the quadrangular frustum pyramid deformation and the thick meat layer of the structural layer are fused into a whole, and then the adhesive of the structural layer is cured by a post-curing process, so that the curing degree reaches 100% (namely, is completely cured). The post-curing process can adopt 60 ℃ baking or ultraviolet curing.

The segmented curing process is also the invention point of the invention. The adhesive adopted by the structural layer or the structural adhesive layer is low in curing degree before use, after use, the quadrangular frustum pyramid structure and the thick meat layer are fused together, and the adhesive is completely cured through a curing process. The adhesive is controlled to be semi-cured before use, the structured adhesive layer is shaped by the reverse structure of the reverse structure release film, and the adhesive is completely cured after the device is pasted.

Controlling the degree of cure of the adhesive is a key. The solidification degree of adhesive enables the adhesive to keep the quadrangular frustum pyramid structure under the limited of reverse structure before using, leaves the type membrane when tearing open reverse structure, enables the adhesive to keep the quadrangular frustum pyramid structure and counterpoints the laminating, enables the adhesive deformation that forms the quadrangular frustum pyramid after the definite time and fuses together with the thick layer of meat.

Further, the structural adhesive layer is arranged on the bearing layer, and the reverse-structure release film is arranged on the structural adhesive layer.

Furthermore, the surface of the reverse structure release film refers to the surface attached to the structured adhesive layer. The reverse structure release film is also called a grid release film.

Further, the quadrangular frustum pyramid forms a matrix. The area between the quadrangular frustum pyramid refers to the area on the thick layer of the meat.

Furthermore, in the structured adhesive tape, the structured adhesive layer has all or part of the technical characteristics of the structural layer in the novel quadrangular frustum pyramid brightness enhancement film.

The material of the structural layer is selected from an acrylic system, a polyurethane system or an adhesive of an organic silicon system; the curing degree of the adhesive is 30-50%.

The curing degree of the adhesive is 30-50% (which can be adjusted according to viscosity and fusion conditions), the linear or branched structure is still more (the body structure of the traditional adhesive after being fully cured is more), the adhesive has the semi-solid characteristic of high fluidity or easy plastic deformation (viscous deformation), and the quadrangular frustum structure of the structured adhesive layer can automatically disappear after a period of time at normal temperature or under heating and is fused with the thick meat layer (as shown in fig. 13a and 13 b).

The weight average molecular weight Mw of the adhesive can be generally selected to be (1-50) ten thousand (generally, 50-1000) ten thousand after the traditional adhesive is fully cured). The smaller the molecular weight, the smaller the viscosity and the shorter the fusion time.

The fusion temperature is typically 25-60 deg.C (the fusion process is actually considered to be creep). The higher the temperature, the shorter the fusion time, and if a certain pressure is applied (a load may be applied after the attachment or a certain negative pressure environment may be provided), the fusion time may be further shortened. Furthermore, the structured glue layer (glue layer for short) may be subjected to a post-curing process (regardless of which fusion conditions were previously used). The post-curing process can be baking at 60 ℃ or ultraviolet curing to further increase the curing degree and molecular weight of the adhesive layer and improve the performance of the adhesive layer.

The adhesive selected for the structural layer can be prepared by the user or can be purchased from the market.

Furthermore, in the fusible structured adhesive tape, the thickness of the bearing layer is 10-1000 μm, the thickness of the reverse structure release film is 25-250 μm, the thickness of the meat-like layer, namely the thickness D of the spacing region is 15-50 μm, the vertical center height H of the quadrangular frustum is 3-10 μm, D is 2-15 times of H, preferably 5-10 times, too high exhaust performance is poor, and fusion performance and definition are affected too little. The thickness D should be large enough to allow easy fusion of the quadrangular frustum.

Furthermore, the thickness B of the bearing layer is 10-1000 μm.

Further, the thickness T of the reverse structure release film is 25-250 mu m.

Furthermore, the thickness of the meat-thick layer, namely the thickness D of the interval area is 15-50 μm.

Furthermore, the vertical center height H of a single quadrangular frustum pyramid is selected from 3-10 mu m, and the H of different quadrangular frustums is the same.

The included angles between the left inclined plane and the right inclined plane of the single quadrangular frustum pyramid and the longitudinal section, namely the included angles between the left inclined plane and the right inclined plane of the trapezoid of the cross section and the height of the vertical center are respectively alpha₁、β₁，α₁、β₁All angles are 15-45 degrees; the included angles between the front inclined plane and the rear inclined plane of the single quadrangular frustum pyramid and the cross section, namely the included angles between the left inclined plane and the right inclined plane of the trapezoid of the longitudinal section and the height of the vertical center are respectively alpha₂、β₂，α₂、β₂All 15-45 degrees. The trapezoidal side of quadrangular frustum pyramid cross section is close to vertical, which is beneficial to the fusion of adjacent quadrangular frustum pyramids.

The periphery of the single quadrangular frustum pyramid is provided with square rings in interval areas, the square rings in the interval areas can be seen as the result of virtual expansion of the bottom surface to the periphery, and the transverse expansion multiplying power along the cross section direction is k₁A longitudinal expansion ratio in the longitudinal sectional direction of k₂，k₁、k₂Has a value range of [0.1,0.5 ]]，k₁、k₂Preferably the same. k is a radical of₁、k₂Reduce, the interval between the adjacent four-edge table reduces promptly, does benefit to the fusion of adjacent four-edge table.

In the fusible structured adhesive tape, when the bearing layer is a substrate, the fusible structured adhesive tape is a single-sided adhesive tape, and the use layer comprises the substrate and the structured adhesive layer; when the bearing layer is a plane release film, the fusible structured adhesive tape is actually a double-sided adhesive tape, and the use layer is a structured adhesive layer.

When the fusible structured adhesive tape is a single-sided adhesive tape, the substrate of the bearing layer is selected from one of a transparent polymer film, a colored polymer film, foam or paper.

When the fusible structured adhesive tape is a double-sided adhesive tape, the plane is separated from the profile by a heavy separation mode, the reverse structure is separated from the film by a light separation mode, namely the reverse structure is separated from the film by a easier separation mode and the adhesive layer. The plane release profile is selected from one of release film and release paper.

Further, in the fusible structured adhesive tape:

the curing degree of the adhesive is 30-50%, for example, the curing degree of the adhesive is 30%, 40%, or 50%.

The thickness B of the bearing layer is 10-1000 μm, such as 10 μm, 25 μm, 38 μm, 50 μm, 100 μm, 250 μm, 500 μm, or 1000 μm.

The thickness of the meat-thick layer, i.e. the thickness D of the spacer region, is 15 to 50 μm, such as 15 μm, 20 μm, 25 μm, 30 μm, 45 μm, or 50 μm.

The vertical center height H of the quadrangular frustum pyramid is 3-10 μm, such as 3 μm, 5 μm, 7 μm, or 10 μm.

D/H is 2, 3, 5, 10, or 15.

A of the single quadrangular frustum₁、β₁、α₂、β₂Are all 15-45 degrees, such as alpha₁、β₁、α₂、β₂All 15 degrees, 30 degrees or 45 degrees.

The periphery of the single quadrangular frustum pyramid is provided with square rings in interval areas, and the transverse expansion multiplying power is k₁Longitudinal expansion magnification of k₂Has a value range of [0.1,0.5 ]]E.g. k₁、k₂All 0.1, 0.2, 0.3 or 0.5.

Dislocation angle of the structural adhesive layer

Is 0 deg..

Further, the bearing layer is a transparent film.

The invention also provides a preparation method of the fusible structured adhesive tape, which comprises the following steps:

(2) and coating the adhesive between the bearing layer and the reverse-structure release film to form a sandwich structure, thus preparing the fusible structured adhesive tape.

Compared with the prior art, the fusible structured adhesive tape provided by the invention has better air exhaust performance and reduces the possibility of generating bubbles in the attaching process. Moreover, two layers of components (such as two novel quadrangular frustum pyramid brightness enhancement films) which need to be aligned and matched mutually can be accurately aligned and bonded together, the quadrangular frustum pyramid structure of the structured glue layer can be fused with the thick meat layer into a whole after being bonded, and the definition of a display device after the two layers of components (such as two novel quadrangular frustum pyramid brightness enhancement films) which need to be aligned and matched mutually are bonded is improved.

Drawings

FIG. 1 is a schematic perspective view of a conventional brightness enhancement film;

FIG. 2 is a schematic diagram of an optical path of a conventional brightness enhancement film;

FIG. 3 is a schematic view of a three-dimensional structure of a novel quadrangular frustum pyramid brightness enhancement film according to the present invention;

FIG. 4a is a schematic light path (cross-section) of a novel quadrangular frustum pyramid brightness enhancement film provided by the present invention;

FIG. 4b is a schematic diagram of the light path (longitudinal section) of the novel quadrangular frustum pyramid brightness enhancement film provided by the present invention;

FIG. 5a is a schematic cross-sectional view of a novel quadrangular frustum pyramid brightness enhancing film provided by the present invention;

FIG. 5b is a schematic longitudinal cross-sectional view of a novel quadrangular frustum pyramid brightness enhancement film according to the present invention;

FIG. 5c is a schematic view of a projection plane of the novel quadrangular frustum pyramid brightness enhancement film according to the present invention;

FIG. 6a is a side view in longitudinal section or a front view in cross section (5 a-5 f) of a novel quadrangular frustum pyramid brightness enhancing film provided by the present invention;

FIG. 6b is a side view in longitudinal section or a front view in cross section (5 g-5 h) of the novel quadrangular frustum pyramid brightness enhancement film provided by the present invention;

FIG. 7 is a top view of a novel quadrangular frustum pyramid brightness enhancing film provided in accordance with the present invention;

FIG. 8 is a schematic view of a light path of 2 novel quadrangular frustum pyramid brightness enhancement films according to the present invention stacked in parallel (cross section is taken as an example);

FIG. 9 is a schematic view of a three-dimensional structure of a novel quadrangular frustum pyramid brightness enhancement film with a meat-thick layer according to the present invention;

FIG. 10 is a schematic bottom projection view of a rectangular frustum with 2 high and 3 low alternately arranged in length and width directions according to the present invention;

FIG. 11 is a schematic cross-sectional view of a structured tape provided by the present invention;

FIG. 12a is a schematic view of a method of aligning and bonding a structured adhesive tape and a novel quadrangular frustum pyramid brightness enhancement film according to the present invention;

FIG. 12b is a second alignment bonding method of the structured adhesive tape and the novel quadrangular frustum pyramid brightness enhancement film according to the present invention;

FIG. 12c is a third alignment bonding method of the structured adhesive tape and the novel quadrangular frustum pyramid brightness enhancement film according to the present invention;

FIG. 13a is a schematic structural view of a fusible structured tape provided in accordance with the present invention prior to fusing;

FIG. 13b is a schematic structural view of the fusible structured tape of the present invention after fusion.

Wherein:

0: a substrate layer; 1: a structural layer; 2: a meat thickness layer; 3: a conventional brightness enhancement film; 4: a novel quadrangular frustum pyramid brightness enhancement film; 5: a quadrangular frustum pyramid; 51: the cross section of a quadrangular frustum pyramid; 52: longitudinal section of quadrangular frustum; 53: the upper surface of the quadrangular frustum pyramid; 54: the vertical center height of the quadrangular frustum pyramid and the intersection point of the two virtual track lines; 55: a vertical virtual trajectory line of the vertex of the orthocenter height of the quadrangular frustum pyramid; 56: a horizontal virtual trajectory line of the vertex of the orthocenter height of the quadrangular frustum pyramid; 6: a spacing region; 61: a longitudinally spaced region; 62: a lateral spacing region; 7: a roll material with a structure layer upward and flatly laid; 70: web corners (top view); 71: rectangular frustum longitudinal section (top view); 72: substrate end face (top view); 81: carrying out local magnification observation by a microscope; 9: incident collimated light of a top-down light path; 91: emergent light with destroyed collimation; 92: emergent light with undamaged collimation; 93: diffuse incident light from a lower to an upper optical path; 94: converged emergent light; 31: a bevel region in a cross section of a conventional brightness enhancement film; 41: the novel quadrangular frustum pyramid brightness enhancement film comprises an inclined plane area in the cross section; 42: a spacing region in the cross section of the novel quadrangular frustum pyramid brightness enhancement film; 43: a plateau region in the cross section of the novel quadrangular frustum pyramid brightness enhancement film; 44: the novel rectangular frustum pyramid brightness enhancement film comprises an inclined plane area in a longitudinal section; 45: the novel rectangular frustum of pyramid brightness enhancement film is provided with a gap area in the longitudinal section; 46: a platform area in the longitudinal section of the novel quadrangular frustum pyramid brightness enhancement film; 5 a: a straight line; 5 b: the broken line is a triangular wave; 5 c: the broken line is a trapezoidal wave; 5 d: the broken line is a square wave; 5 e: the curve is a sine wave; 5 f: the curve is a circular arc wave; 5 g: the intermittent broken line is intermittent triangular wave; 5 h: the intermittent broken line is intermittent trapezoidal wave; 5 i: the intermittent broken line is an intermittent square wave; 5 j: the intermittent curve is an intermittent sine wave; 5 k: the intermittent curve is an intermittent circular arc wave. 10: a structured adhesive tape; 101: a carrier layer; 102: a structured glue layer; 103: grid release film; 11 a: a use layer of single-sided tape (the remaining part of the single-sided release film is removed); 11 b: a use layer of double-sided tape (the remaining part of the double-sided release film is removed); 12: an air passage; 13: a diffusion membrane; 14: a display panel; 15: a component 1 to be aligned and attached; 16: the component 2 which needs to be aligned and attached; 17 a: a glue layer before fusion; 17 b: and (5) a fused glue layer.

Detailed Description

For a better understanding of the present invention, its structure, and the functional features and advantages attained by its structure, reference is made to the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which:

as shown in fig. 1, a schematic view of a three-dimensional structure of a conventional brightness enhancement film is shown, where 0 is a substrate layer, 1 is a structural layer, and all triangular prisms in the structural layer are closely arranged without any space. When the incident collimated light 9 (only shown, not necessarily normal incidence) traveling from top to bottom passes through the prism structure, the light must be deflected, destroying its collimation, since the inclined surface is everywhere. As shown in fig. 2, the light path of the cross section of the conventional brightness enhancement film is schematically shown, and it can be seen that when the incident collimated light 9 (solid line) passes through the inclined surface region 31 in the cross section, it is divided into two directions of refracted light, and the emergent light 91 (dotted line) with the collimation destroyed is formed, that is, after the collimated light 9 passes through the conventional prism triangular prism, the collimated light which can keep the original propagation direction and arrangement sequence does not exist at all.

Fig. 3 is a schematic diagram of a three-dimensional structure of a novel four-edged stand brightness enhancement film 4 provided by the present invention, where 0 is a substrate layer, 1 is a structural layer, all four-edged stands 5 in the structural layer are arranged in two-dimensional intervals, and there are interval regions 6 between the four-edged stands, including a longitudinal interval region 61 and a transverse interval region 62. When the incident collimated light 9 propagating from top to bottom passes through the structure layer, since the interval region does not destroy the collimation of the light, a certain degree of collimation is maintained, i.e. a better collimated light transmittance is achieved. A schematic diagram of the optical path of a cross section 51 (longitudinal section 52) of the novel quadrangular frustum of a brightness enhancement film is shown in figure 4a (4b), it can be seen that as the incident collimated light 9 (solid line) passes through the cross-section (longitudinal section), the sloped surface region 41 (sloped surface region 44) splits the incident light into refracted light in two directions, constituting the collimation-disrupted exit light 91 (dashed line), but as the incident collimated light 9 passes through the spaced regions 42 (spaced regions 45) and plateau regions 43 (plateau regions 46) in the cross-section (longitudinal section), the planar area formed by the spacing area 42(45) and the platform area 43(46) enables the incident light to keep the original propagation direction and arrangement sequence, and forms emergent light 92 (solid line) with undamaged collimation, and provides collimated light transmission performance for the whole brightness enhancement film, so that the novel quadrangular frustum brightness enhancement film has better collimated light transmittance.

As shown in the top-down light path of fig. 8, the luminance is increased under the condition that the collimated incident light 9 passes through the planar region for many times to generate the collimated emergent light 92 (as shown in the bottom-up light path of fig. 8, the diffused incident light 93 is refracted twice by the inclined plane, so that as much light as possible becomes the convergent emergent light 94, the light condensing effect is improved), and the luminance loss is further reduced. For example, in the single-sheet application mode with a large collimation transmittance and a large luminance loss, the collimation transmittance can be kept still 'large' by the precise alignment parallel stacking, but the luminance loss can be improved to 'small', even 'small'.

Example 1

As shown in fig. 3, 5a, 5b and 7, the novel brightness enhancement film of quadrangular frustum and its cross section provided by the present invention comprises a substrate layer 0 and a structural layer 1, wherein the structural layer 1 is disposed on the substrate layer, wherein the structural layer 1 comprises a plurality of quadrangular frustums 5, the quadrangular frustums are two-dimensionally arranged at intervals and are not connected to each other, a spacing region 6 is disposed between vertically and horizontally adjacent quadrangular frustums, the spacing region 6 comprises a longitudinal spacing region 61 and a transverse spacing region 62, and the surface roughness Ra of the upper surface 53 of the rectangular frustums and the spacing region 6<100nm, the intersection point of the vertical center height of the quadrangular frustum pyramid and the two track lines is 54, the vertical center height H of the trapezoid (quadrangular frustum pyramid) is 25 μm, the longitudinal track line 55 is in a linear state 5a, and the amplitude A is₁At 0 μm, the transverse trace 56 assumes a linear configuration 5a, amplitude A₂Is 0 μm, the cross section 51 of the quadrangular frustum is trapezoidal, and the included angle alpha between the left oblique side and the height in the cross section₁Is 45 degrees, and the included angle beta between the right bevel edge and the height₁Is 45 degrees, the longitudinal section 52 of the quadrangular frustum pyramid is trapezoidal, and the included angle alpha between the left bevel edge and the height in the longitudinal section₂Is 45 degrees, and the included angle beta between the right bevel edge and the height₂Is 45 degrees, and the transverse expansion multiplying power of the bottom surface is k₁0.2, longitudinal expansion ratio k₂0.2, vertical extension ratio t of orthocenter height is 0.1, and dislocation angle of the structural layer

Is 0 deg..

The main properties of the novel quadrangular frustum brightness enhancement film provided by the present invention were evaluated in the following manner.

Luminance: the reflecting film, the light guide plate, the diffusion film and the novel quadrangular frustum brightness enhancement film or the traditional brightness enhancement film stack (two orthogonal traditional brightness enhancement films, the brightness enhancement structure is a closely arranged triangular prism with a vertex angle of 90 degrees) form a backlight framework, the backlight framework is assembled with a module and then is lightened, and B is utilizedM-7 tests 9 points of brightness average value, and compared with the traditional brightness enhancement film stack structure, the brightness loss is calculated (the brightness loss can pass through (S)₁+S₅)/S₃Calculate the ideal value). Evaluation grade: great loss of brilliance [0.7, 1)>Large [0.4, 0.7)>Larger [0.2, 0.4)>Smaller [0.1, 0.2)>Small [0.05, 0.1)>Very small (0, 0.05).

Collimated light transmittance: the novel quadrangular frustum pyramid brightness enhancement film utilizes a collimation light transmittance instrument to test the typical wavelengths of 550nm and 940 nm. If all the quadrangular frustum structures and the gaps are the same, the square frustum can pass through (S)₁+S₅)/S₃(see FIG. 5 c) to calculate the ideal value, let (1+ T) be T, (1+ k)₁) And (1+ k)₂) Is K₁、K₂Then (S)₁+S₅)/S₃＝[t/(1+t)+(k₁×k₂+k₁+k₂)]/(1+k₁)×(1+k₂)＝(1-1/T+K₁×K₂-1)/K₁×K₂＝1-1/(T×K₁×K₂) The actual value will typically be slightly less than the ideal value. Evaluation grade: collimation light transmittance maximum [0.7, 1)>Large [0.4, 0.7)>Larger [0.2, 0.4)>Smaller [0.1, 0.2)>Small [0.05, 0.1)>Very small (0, 0.05).

Examples 2 to 35

The novel brightness enhancing film of quadrangular frustum pyramid as provided in example 1, wherein the parameters are listed in table 1.

TABLE 1 parameters and Properties of examples 1-35

Note 1: stage number representing quadrangular frustum pyramidThe classification (rank) order of the different quadrangular frustums within the repeating unit; the row number represents the number of the rectangular frustums of the same type (level) longitudinally arranged in the repeating unit, and the column number represents the number of the rectangular frustums of the same type (level) transversely arranged in the repeating unit; if not otherwise stated, all the quadrangular frustums are the same by default: the number of stages is 1, the number of rows is 1, and the number of columns is 1; when the number of the quadrangular frustum pyramid is more than 1, the number of the steps, i.e., the subscripts of all the symbols, such as the vertical center height of the quadrangular frustum pyramid, shall be respectively represented as H₁、H₂… …, respectively; note 2: in a quadrangular frustum cross section, α₁Angle of left bevel to height, beta₁Is the angle between the right bevel edge and the height, unit^°(ii) a In longitudinal section of the quadrangular frustum of a pyramid, α₂Angle of left bevel to height, beta₂Is the angle between the right bevel edge and the height, unit^°；k₁Is the lateral expansion ratio of the bottom surface, k₂The longitudinal expansion multiplying power of the bottom surface is shown, and t is the vertical extension multiplying power of the vertical center height, and the vertical extension multiplying power is a dimensionless unit; a. the₁Amplitude (absolute value) of variation (+/-) of the transverse virtual trajectory line, A₂Amplitude (absolute value) of variation (+/-) of vertical virtual trajectory line in units of μm, A₁And A₂The same is called A, H is the average orthocenter height of the quadrangular frustum pyramid, the unit is mum, and the height of the quadrangular frustum pyramid is H +/-A;

the included angle between the straight line connected with the projection line section of the longitudinal section on the substrate layer and the projection straight line of the substrate end face, i.e. the dislocation angle, unit of the structural layer^°(ii) a Ra is the surface roughness of the upper surface of the rectangular frustum pyramid and the spacing region in nm; (S)₁+S₅)/S₃The ratio of the sum of the square ring area of the spacer region and the rectangular area of the platform to the area of the expanded rectangle, namely the theoretical ratio of the plane region, represents the theoretical collimation light transmittance and is free of dimensional units;

from the comparison results of examples 1 to 5 in Table 1, it can be seen that the change in the vertical center height H has almost no influence on the optical properties when the other conditions are not changed.

As can be seen from the results of comparing examples 1 and 6 to 9 in Table 1, when the other conditions were not changed, α was₁And beta₂As the angle approaches 45 °, the luminance loss is relatively small, i.e., the luminance is high. Alpha is alpha₂And beta₂The same is true.

From the results of comparing example 1 with examples 10 and 11 in Table 1, it can be seen that when α is₁And beta₁When the sum of (a) is constant, when a₁And beta₁The larger the difference, the poorer the symmetry of the quadrangular frustum, and the relatively larger the luminance loss, i.e., the lower the luminance. Therefore, a symmetrical structure, i.e. alpha, is preferred₁And beta₁Are equal. Alpha is alpha₂And beta₂The same is true.

As can be seen from the results of comparing examples 1 and 12 to 20 in Table 1, when the other conditions were not changed, k was₁、k₂And when t is increased, the theoretical proportion of the plane area is continuously increased, the actually tested collimation light transmittance is also continuously increased, and the luminance loss is also continuously increased. k is a radical of₁、k₂T is selected according to the requirements of different occasions on the tolerance of the luminance loss and the collimation light transmittance, and k is₁、k₂And t may be different.

From the comparison of examples 1 and 21-30 in Table 1, it can be seen that the amplitude A of the horizontal virtual trace line is constant under other conditions₁When the thickness is controlled within 0-2 μm, the shape of the transverse virtual track line basically has no influence on the optical performance. Longitudinal virtual trajectory and amplitude A₂The same is true.

From the comparison of examples 1 and 24, 31 in Table 1, it can be seen that the amplitude A of the transverse virtual trace is constant under other conditions₁Controlling the amplitude A of the horizontal virtual trace line within 0-2 μm₁There is substantially no effect on the optical performance. Longitudinal virtual trajectory and amplitude A₂The same is true.

From the comparison results of examples 1, 32 and 33 in Table 1, it can be seen that the dislocation angle of the structural layer is not changed under the other conditions

When changed, had no effect on optical performance.

From the results of comparison of examples 17 and 34 in table 1, it can be seen that, when the other conditions are not changed, when the surface roughness Ra of the upper surface of the rectangular prism table and the spacing region becomes large, the actual transmittance of collimated light is further reduced, but the luminance loss is substantially unchanged, whereas, when Ra becomes small, the results of comparison of examples 13 and 35 can be seen that the actual transmittance of collimated light is further increased, but the luminance loss is also substantially unchanged.

Examples 36 to 40

The novel brightness enhancing films of quadrangular frustum pyramid as provided in example 1, wherein the parameters are listed in table 2.

TABLE 2 parameters and Properties of examples 36 to 40

Note 1-2 in Table 1

Note 3: the trajectory line form in table 2 represents the jitter relationship between the quadrangular frustums of the same stage, and is a virtual connection line formed by all vertexes of the quadrangular frustums of the same stage; for example, 5a indicates the height of the truncated quadrangular pyramid. Fig. 10 is a schematic bottom projection view of a 2-stage 3-stage alternating rectangular prism table of example 39, in which the minimum repeating unit (solid line area) includes 25 rectangular prisms, i.e., 5 × 5, where the bottom of the 1-stage rectangular prism table is represented by a solid rectangle and the bottom of the 2-stage rectangular prism table is represented by an empty rectangle; the weighted average is the weighted average of the theoretical proportion of the platform areas of the quadrangular frustum with different levels, namely (Sigma S)₅+ΣS₁)/ΣS₃；

Note 4: the number of stages # row/column in table 2 indicates: in the structure layer of example 36, 1# square prism and 1# square prism were alternately arranged in either the horizontal or vertical direction. In the structure layer of example 37, 1# square prism and 5 # square prism were alternately arranged in both the lateral and longitudinal directions. In the structure layer of example 38, 1# square prism and 10 # square prisms were alternately arranged in both the lateral and longitudinal directions. In the structure layer of example 39, 2# quadrangular frames and 3 # 2 quadrangular frames were alternately arranged in both the lateral and longitudinal directions. In the structure layer of example 40, 1# square prism and 1# 2 square prism were alternately arranged in both the lateral and longitudinal directions.

As can be seen from the comparison results of examples 36 to 40 in Table 2, when other conditions are not changed, only the number of the steps and the number of the truncated quadrangular pyramid are changed, and the collimated light transmittance is influenced by the weighted average of the ratio of the planar regions of the truncated quadrangular pyramid with different steps, when H is higher than H₂And H₁When the difference is small, the difference in luminance loss is negligible. The comparison result between example 36 and example 40 shows that the trace line shapes of different quadrangular frustum pyramid can be selected in different combinations, and have no influence on the optics. The example variations of table 2 are generally useful for the improvement of the adsorption resistance of the novel quadrangular frustum brightness enhancement film.

EXAMPLE 41

As shown in fig. 11, a cross section of the structured adhesive tape 10 provided by the present invention includes a carrier layer 101, a structured adhesive layer 102 and an inverse structure release film 103, the structured adhesive layer is disposed between the carrier layer and the inverse structure release film, the carrier layer is a substrate, the substrate is transparent PET, the thickness B is 50 μm, the thickness T of the inverse structure release film is 25 μm, the structured adhesive tape is a single-sided adhesive tape, wherein the structured adhesive layer includes a thickness and a plurality of rectangular prism tables, the rectangular prism tables are arranged at intervals, a region between the rectangular prism tables is referred to as an interval region, the thickness D of the thickness layer or the interval region is 5 μm, the height H of the rectangular prism table is 3 μm, and a surface structure of the inverse structure release film is completely complementary to the rectangular prism table structure of the structured adhesive layer. The cross section of the quadrangular frustum pyramid is trapezoidal, and the included angle alpha between the left and right oblique sides and the height in the cross section₁、β₁Are all 45 degrees, the trapezoid of the longitudinal section and the trapezoid of the cross section of the quadrangular frustum are completely the same, and the transverse expansion multiplying power of the bottom surface is k₁0.1, the longitudinal expansion of the bottom surface is the same as the transverse expansion, the vertical extension ratio t of H is 1, and the dislocation angle of the structured adhesive layer

Is 0 deg..

TABLE 3 parameters and Properties of examples 41-70

Note 1: in the cross section parameters, B is the thickness of the bearing layer and the unit mum, T is the thickness of the reverse structure release film, the unit mum, D is the thickness of the structural adhesive layer, the unit mum, H is the structural height of the structural adhesive layer, the unit mum, alpha₁Angle of left bevel to height, beta₁Is the angle between the right bevel edge and the height, unit^°；k₁The transverse expansion multiplying power of the bottom surface is shown, and t is the vertical extension multiplying power of the vertical center height, and the transverse expansion multiplying power and the vertical extension multiplying power are dimensionless units;

is the dislocation angle, unit of the structured glue layer^°；

From the comparison results of examples 41 to 44 in table 3, it is found that, when the other conditions are not changed, the larger the expansion ratio in the longitudinal and transverse directions is, the larger the space ratio is, the better the exhaust effect is, and the exhaust passage is widened in the horizontal direction. In contrast, in the

comparison

41, 45, and 46, the rectangular frustum becomes flatter as the vertical extension ratio t of the rectangular frustum orthocenter height H becomes larger, but the exhaust effect is not affected. It can be found by comparing 41 and 47-53 that when other conditions are not changed, the larger the vertical center height H is, the more favorable the exhaust is, because the exhaust channel is enlarged in the vertical direction, it should be noted that when H is larger, a thicker reverse structure release film is needed to be used for matching. The comparison of 41, 54-64 shows that the exhaust effect is not affected no matter the thickness D of the bearing layer or the thickness B of the bearing layer. Comparative example 64 ~ 70 can find that no matter the bearer layer is the substrate or the plane leaves the section bar, no matter the substrate is transparent PET, coloured PET, bubble cotton or paper, no matter the plane leaves the section bar and is from type membrane or from type paper, all does not have the influence to exhaust effect.

Example 71

As shown in fig. 11, the cross section of the structured adhesive tape 10 provided by the present invention includes a carrier layer 101, a structured adhesive layer 102 and an inverse structure release film 103, wherein the structured adhesive layer is disposed between the carrier layer and the inverse structure release film, and the structured adhesive layer is made of an acrylic adhesiveThe curing degree of adhesive is 50%, the bearer layer is the substrate, the substrate is transparent PET, thickness B is 50 μm, the thickness T of anti-structure type membrane is 25 μm, the structured adhesive tape is single face adhesive tape, wherein the structured adhesive layer includes meat thickness and a plurality of four-edge terrace, four-edge terrace interval arrangement, the region between four-edge terrace is called interval region, the thickness of meat thickness layer, interval region's thickness D is 15 μm promptly, the height H of four-edge terrace structure is 3 μm, the surface structure of anti-structure type membrane is complete complementary with the four-edge terrace structure of structured adhesive layer. The cross section of the quadrangular frustum pyramid is trapezoidal, and the included angle alpha between the left and right oblique sides and the height in the cross section₁、β₁All are 30 degrees, the longitudinal section trapezoid and the cross section trapezoid of the quadrangular frustum are completely the same, and the transverse expansion multiplying power of the bottom surface is k₁0.1, the longitudinal expansion of the bottom surface is the same as the transverse expansion, the vertical extension ratio t of H is 1, and the dislocation angle of the structured adhesive layer

Is 0 deg.. Example 71 the venting performance was better during application and the integration of the structured gum layer with the meat-like layer was better after application.

Examples 72 to 100

The structured tape provided in example 71, wherein the parameters are listed in Table 4.

TABLE 4 parameters and Properties of examples 71-100

Note 1 in Table 3.

From the comparison results of examples 71 to 74 in table 4, it is found that, when the other conditions are not changed, the larger the expansion ratio in the longitudinal and transverse directions is, the larger the space ratio is, the better the exhaust effect is, but the fusion performance gradually deteriorates. The comparison of 71, 75 and 76 shows that the larger the vertical extension ratio t of the vertical center height H of the quadrangular frustum pyramid, the greater the vertical extension ratio t, the exhaust effect and the fusion effect are not affected. Comparison of 71, 77 and 78 shows that when other conditions are not changed, the inclined edge and the high included angle have little influence on exhaust, but slightly change the fusion performance, and the smaller the included angle, the better the fusion is. Comparison 71, 79-88 shows that, under the same other conditions, the higher the sag height H, the more favorable the venting, but the more unfavorable the fusion, and the larger the ratio of the thickness D to H, the better the fusion performance (note that, when H is larger, a thicker reverse structure release film is needed to match). Comparison 89 ~ 100 can discover, no matter be the thickness B of bearer layer or the thickness T of reverse structure from the type membrane, no matter the bearer layer is the substrate or the plane leaves the section bar, no matter the substrate is transparent PET, coloured PET, bubble cotton or paper, no matter the plane leaves the section bar and is from the type membrane or from type paper, and these non-functional layer's parameter and material change do not all have the influence to exhaust effect and fusion effect. Comparing examples 72 with 101 and 102, it can be seen that when the degree of cure of the structured bondline is reduced, it does not greatly affect the outgassing performance, but contributes to the improvement of the fusion performance. It should be noted that the good and fast fusing performance only affects the difficulty of fusing after bonding, or the fusing time, and the above embodiments can achieve fusing and enable a bonded display device to have higher definition.

It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes and modifications made according to the disclosure of the present invention are covered by the scope of the claims of the present invention.

Claims

1. The utility model provides a novel four prismatic table brightness enhancement films, its characterized in that, brightness enhancement film includes substrate layer and structural layer, the structural layer is arranged on the substrate layer, the structural layer includes a plurality of four prismatic tables, four prismatic table interval arrangements, the region between the four prismatic tables is called interval region.

2. The novel brightness enhancing film according to claim 1, wherein the upper surface of the truncated pyramid is a flat area, and the truncated pyramid forms a matrix.

3. The novel brightness enhancement film according to claim 2, wherein the included angles between the right and left slopes of the single quadrangular frustum pyramid and the vertical section, i.e. the included angles between the right and left slopes of the trapezoid with the cross section and the vertical center height, are respectively α₁、β₁，α₁、β₁All angles are 15-75 degrees; alpha is alpha₁And beta₁Is a sum of₁，θ₁30 to 150 degrees; the included angles between the front inclined plane and the rear inclined plane of the single quadrangular frustum pyramid and the cross section, namely the included angles between the left inclined plane and the right inclined plane of the trapezoid of the longitudinal section and the height of the vertical center are respectively alpha₂、β₂，α₂、β₂All angles are 15-75 degrees; alpha is alpha₂And beta₂Is a sum of₂，θ₂30 to 150 degrees; the vertical center height H of the single quadrangular frustum pyramid is 5-100 mu m; the vertical center heights of different quadrangular tables are the same or different.

4. The novel quadrangular frustum brightness enhancing film according to claim 1, wherein the brightness enhancing film comprises a substrate layer, a structural layer and an inverted release film from bottom to top; the material of the structural layer is selected from an acrylic system, a polyurethane system or an adhesive of an organic silicon system; the structural layer comprises a thickness and a plurality of quadrangular frustum pyramid, the bottom surface of the quadrangular frustum pyramid is connected with the upper surface of the thickness, the quadrangular frustum pyramid is arranged at intervals, and the area between the quadrangular frustum pyramid is called as an interval area; the curing degree of the adhesive is 30-50%; the surface structure of the reverse structure release film is completely complementary with the quadrangular frustum pyramid structure of the structured adhesive layer.

5. The novel brightness enhancement film according to claim 4, wherein the rectangular prism of the structural layer is deformable and fuses with the thick layer to form a flat layer when the release film is peeled.

6. The novel quadrangular frustum brightness enhancing film according to claim 5, wherein the reverse structure release film is a light release film, and the substrate layer is a heavy release film.

7. Use of the novel brightness enhancing film according to any of claims 4-6 as an adhesive tape.

8. The structured adhesive tape is characterized by sequentially comprising a bearing layer, a structured adhesive layer and an inverted structure release film, wherein the structured adhesive layer is arranged between the bearing layer and the inverted structure release film; the bearing layer is a base material or a plane separation section, the structured adhesive layer comprises a meat thickness and a plurality of quadrangular frustum pyramid, the bottom surfaces of the quadrangular frustum pyramid are connected with the upper surface of the meat thickness, the quadrangular frustum pyramid is arranged at intervals, and the area between the quadrangular frustum pyramid is called as an interval area; the material of the structured adhesive layer is selected from an adhesive of an acrylic system, a polyurethane system or an organic silicon system; the curing degree of the adhesive is 30-50%; the surface structure of the reverse structure release film is completely complementary with the quadrangular frustum pyramid structure of the structured adhesive layer.

9. The structured adhesive tape of claim 8 wherein the rectangular prism shaped lands of the structured adhesive layer are capable of deforming and fusing together with the thick layer of meat to form a flat layer when the reverse structured release film is torn.

10. The structured adhesive tape of claim 8 wherein the carrier layer has a thickness of 10 to 1000 μm, the reverse structured release film has a thickness of 25 to 250 μm, the meat-thick layer, i.e., the spacer region, has a thickness of 15 to 50 μm, and the truncated height H of the rectangular frustum is 3 to 10 μm.