CN111435203A - Novel collimated light permeable brightness enhancement film and preparation method thereof - Google Patents
Novel collimated light permeable brightness enhancement film and preparation method thereof Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133504—Diffusing, scattering, diffracting elements
- G02F1/133507—Films for enhancing the luminance
Abstract
The invention relates to a novel optical film, in particular to a novel brightness enhancement film with triangular prisms arranged at intervals and transparent collimated light and a preparation method thereof. The problem that the existing brightness enhancement film cannot allow collimated light to penetrate through is solved. The invention provides a novel brightness enhancement film. Novel brightness enhancement film includes substrate layer and structural layer, the structural layer is arranged in on the substrate layer, the structural layer includes a plurality of triangular prism, triangular prism interval arrangement, each other do not meet, interval region level and smooth, collimated light permeable, the cross section of triangular prism is triangle-shaped, and triangle-shaped's side all restricts in the space directly over the base, can not block interval region's collimated light and see through, the bottom surface of triangular prism is parallel to each other all the time and the vertical section is parallel to each other all the time. The novel brightness enhancement film has better collimated light transmission performance.
Description
Technical Field
The invention relates to a novel optical film, in particular to a novel brightening film with triangular prisms arranged at intervals and transparent collimated light and a preparation method thereof.
Background
Liquid Crystal Display L CD (L acquired Crystal Display) is the most common Display technology at present, and a backlight module B L U (Back L light Unit) is needed to provide a high-brightness and uniform light source to achieve the Display effect, and B L U includes three main optical films, namely a reflective film, a diffusion film and a brightness enhancement film.
The diffusion film DIF (diffuser) mainly plays a role of light evening in B L U, is arranged below the brightness Enhancement film to provide a uniform surface light source for the brightness Enhancement film BEF (brightness Enhancement film) mainly plays a role of light condensation in B L U, is arranged above the diffusion sheet, and is used for reconverging uniform light rays provided by the diffusion sheet to be within a central visual angle (generally within 35 degrees of a line normal to a light emitting surface), so that the luminous intensity in a normal direction and the front view brightness 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 is limited by the application: 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, it is necessary to provide a further solution to develop a new brightness enhancement film with transmittance of collimated light.
Disclosure of Invention
The problem that the existing brightness enhancement film cannot allow collimated light to penetrate through is solved. The invention provides a novel brightness enhancement film with triangular prisms arranged at intervals and capable of transmitting collimated light, and the novel brightness enhancement film has better performance of transmitting the collimated light.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a novel brightness enhancement film which comprises a substrate layer and a structural layer, wherein the structural layer is arranged on the substrate layer and comprises a plurality of triangular prisms which are arranged at intervals, and a spacing area is arranged between every two adjacent triangular prisms. The bottom surface of the triangular prism is positioned above the base material layer,
the triangular prisms are arranged at intervals and are not connected with each other. The spacing area is flat and smooth, and collimated light can penetrate through the spacing area. The cross section of the triangular prism is triangular, the side edges of the triangular prism are limited in the space right above the bottom edge, the transmission of collimated light in the interval area can not be blocked, the bottom surfaces of the triangular prism are always parallel to each other, and the longitudinal sections of the triangular prism are always parallel to each other.
The triangular prism is formed by extending a triangular cross section towards the depth direction of the triangular prism infinitely.
The triangular prism is formed by extending a triangular cross section along the surface of the substrate layer infinitely.
The bottom surface of the triangular prism is formed by extending the bottom side of a triangle with a cross section towards the depth direction of the triangular prism infinitely.
The longitudinal section of the triangular prism is formed by extending the height of a triangle with a triangular cross section towards the depth direction of the triangular prism infinitely.
The ridgeline of the triangular prism is formed by extending the vertex of a triangle with a cross section towards the depth direction of the triangular prism infinitely, and the ridgeline is on the longitudinal section.
The included angles between the left inclined plane and the right inclined plane of the single triangular prism and the longitudinal section are respectively α degrees, β degrees and β degrees between the left inclined plane and the right inclined plane of the triangular cross section and the high included angle, and in order to improve the structural brightness, the included angles are preferably 40-50 degrees and preferably 45 degrees.
Further, α, β of the single triangular prism may be the same or different in order to reduce the difficulty of process implementation, improve luminance, and control the viewing angle symmetry, it is preferable that the same, when the cross-sectional triangle is an isosceles triangle.
Further, α of the plurality of triangular prisms may be the same or different, and β may be the same or different.
Furthermore, the sum of α and β forms the vertex angle theta of the triangle, and theta is 30-150 degrees.
Further, θ of different triangular prisms may be the same or different. In order to reduce the difficulty of process implementation, the same is preferred.
The height H of the single triangular prism is 5-100 mu m.
Further, the heights of the plurality of triangular prisms may be the same or different. To reduce the difficulty of implementing the process, it is preferably the same, or mostly the same, such as 1 high by 1 low, etc.
The width of the single triangular prism and the length of the base of the single cross-section triangle are W, and the left side projection W is tan (α) × H, the right side projection Wb is tan (β) × H, and W is Wa + Wb;
the interval length of the triangular prism is formed by the length of extension lines from the bottom edge of a triangle of a single triangular prism section to two sides (like virtual expansion of a similar triangle), the extension magnification is k, wherein the left extension line Ea is k × Wa, the right extension line Eb is k × Wb, and the value range of k is [0.01,100 ];
the interval E between the adjacent triangular prisms is the sum of the right extension Eb of the left triangular prism and the left extension Ea of the right triangular prism, when the triangular prisms have the same structure, E can be calculated according to E ═ Wa + Wb) × k, the horizontal distance P between the triangular prisms is obtained by adding Wb and Eb on the right side of the vertical section of the left triangular prism and Wa and Ea on the left side of the vertical section of the right triangular prism, when the triangular prisms have the same structure, P ═ Wa + Wb + Ea + Eb ═ Wa + Wb + E ═ Wa + Wb) × (1+ k).
The interval area is flat and smooth, and the flat and smooth surface roughness Ra is less than or equal to 250nm, and further Ra is less than 250 nm. The actual value of the collimated light transmittance is generally slightly less than the ideal value (E/P ratio) due to the reflection losses in the spacer regions and the high surface roughness that 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 shape of the ridge line on the side view is selected from one or the combination of at least two of a straight line, a broken line, a curve, an intermittent broken line and an intermittent curve.
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.
The amplitude (height change) A' of the ridge line is selected from +/-0, 2 mu m, and positive and negative represent directions (positive upper and negative lower).
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 substrate and the smooth outer surface of the mould, this gap being of a thickness such that the resin, after curing, forms a meat-like layer (see figure 9).
The thickness of the meat-thick layer, namely the thickness of the interval area is 0.1-10 mu m;
the projection of any triangular prism longitudinal section on the substrate layer is a straight line A, the projection of the substrate end face 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 as 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, α is 15-75 °, e.g. 15 °, 30 °, 40 °, 45 °, 50 °, 60 °, 75 °.
Further, β is 15-75 °, e.g. 15 °, 30 °, 40 °, 45 °, 50 °, 60 °, 75 °.
Further, k is 0.01 to 100, such as 0.01, 0.1, 0.2, 0.5, 1, 2, 3, 4, 9, 100.
Further, the amplitude A' is 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, E/P is 0.01-0.99, such as 0.01, 0.09, 0.17, 0.33, 0.5, 0.67, 0.75, 0.8, 0.9, 0.99.
Furthermore, the structure layer is composed of triangular prism units, one triangular prism unit is called a repetition period, the number of types of different triangular prisms in one triangular prism unit is called a series number, and the number of triangular prisms in one triangular prism unit is called a number. Within one triangular prism unit (repeating cycle), the number of stages is 1 or 2, and the number is 1 to 10, for example, the number is 1, 2, 3, 5, or 10.
The invention also provides a preparation method of the novel brightness enhancement film, which comprises the following steps:
(1) and grinding and polishing the mold until the surface is flat and smooth, and engraving the mold with a complementary structure according to the triangular prism structure, the arrangement mode and the depth direction.
(2) And filling polymer resin between the mold and the substrate, and micro-copying a structural layer on the substrate layer through molding and demolding to obtain the novel brightness enhancement film with the collimated light being transparent.
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 brightness enhancement film sheet combination comprises a sheet A or a sheet B, wherein the cutting angle A of the sheet A is selected from 0-90 degrees, and the cutting angle B of the sheet B is selected from 90-180 degrees; the brightness enhancement film sheet combination is a combination of at least two of the A sheet and/or the B sheet.
The invention also provides a using method of the novel 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 an A sheet and a B sheet which are required by backlight module assembly and have the shapes and sizes according to cutting angles A and B (B is A +90 degrees), wherein A is selected from 0-90 degrees, and B is selected from 90-180 degrees.
The assembling method is selected from one of A type (single sheet assembly), AA type (two parallel assemblies), AB type (two orthogonal assemblies) AABB type and ABAB type precise alignment and stacking in sequence on the lower diffusion or light guide plate in the backlight module.
Particularly, it is worth mentioning that during the use of the novel brightness enhancement film, it is easy to find that the luminance loss and the collimated light transmittance show strong positive correlation. For example, in the original single-sheet use mode of large collimation transmittance and large luminance loss, the collimation transmittance can be kept still 'large', but the luminance loss can be improved to 'small', even 'small' by the precise alignment parallel stacking.
In the existing brightness enhancement film, a prism structure which is arranged closely is adopted, and a smooth interval area is not leveled, so that the problem that collimated light cannot penetrate exists.
Compared with the prior art, the novel brightness enhancement film provided by the invention has better collimated light transmission performance. When the spacing region Ra becomes smaller, the actual collimated light transmittance is further improved, but the luminance loss is substantially unchanged.
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 perspective view of a novel brightness enhancement film according to the present invention;
FIG. 4 is a schematic view of a light path of the novel brightness enhancement film according to the present invention;
FIG. 5 is a schematic cross-sectional view of a novel brightness enhancement film provided in accordance with the present invention;
FIG. 6a is a side view of a longitudinal section of a novel brightness enhancement film of the present invention (5 a-5 f);
FIG. 6b is a side view of a longitudinal section of the novel brightness enhancement film of the present invention (5 g-5 k);
FIG. 7 is a top view of a projection plane of a novel brightness enhancement film provided in accordance with the present invention;
FIG. 8 is a schematic view showing the optical paths of 2 brightness enhancement films stacked in parallel according to the present invention;
fig. 9 is a schematic perspective view of a novel brightness enhancement film with a meat-thick layer according to the present invention.
Wherein:
0: a substrate layer;
1: a structural layer;
2: a meat thickness layer;
3: a conventional brightness enhancement film;
4: a novel brightness enhancement film;
5: a triangular prism;
51: a cross section of a triangular prism;
52: a longitudinal section of a triangular prism;
53: a ridge line of a triangular prism;
6: a spacing region;
7: a roll material with a structure layer upward and flatly laid;
70: web corners (top view);
71: trapezoidal quadrangular longitudinal section (plan 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: a bevel region in a cross section of the novel brightness enhancement film;
42: a spacer region in a cross section of the novel 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;
Detailed Description
For a better understanding of the invention with regard to its structure and the functional features and advantages achieved, reference will now be made to the following description of preferred embodiments of the invention, 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 brightness enhancement film 4 provided by the present invention, where 0 is a substrate layer, 1 is a structural layer, all triangular prisms 5 in the structural layer are arranged at intervals, and an interval region 6 is present between the triangular prisms. When the incident collimated light 9 propagating from top to bottom passes through the structural layer, the interval region does not destroy the collimation of the light, so that the collimation at a certain degree is maintained, namely, the light transmission rate of the collimated light is better. As shown in fig. 4, it can be seen that when the incident collimated light 9 (solid line) passes through the cross section, the inclined surface region 41 divides the incident light into refracted light beams in two directions to form an emergent light 91 (dotted line) with damaged collimation, but when the incident collimated light 9 passes through the spacing region 42 in the cross section, the planar region formed by the inclined surface region 42 keeps the incident light in the original propagation direction and arrangement sequence, and forms an emergent light 92 (solid line) with undamaged collimation, thereby providing collimated light transmittance for the whole brightness enhancement film, and therefore the novel brightness enhancement film has better collimation transmittance.
As shown in the top-down light path of fig. 8, the collimated light incident light 9 passes through the planar region multiple times to generate collimated emergent light 92, thereby improving the luminance (as shown in the bottom-up light path of fig. 8, the diffuse incident light 93 is refracted twice by the inclined surface, so that as much light as possible is changed into convergent emergent light 94, thereby improving the light condensing effect), and further reducing the luminance loss. For example, in the single-sheet application mode with a large collimation transmittance and a large luminance loss, the collimation transmittance can be maintained to be still 'large' by the precise alignment parallel stacking, but the luminance loss can be improved to be 'small', even 'small'.
Example 1
As shown in fig. 3, 5 and 7, the novel brightness enhancement film and the cross section thereof provided by the present invention comprise a substrate layer 0 and a structural layer 1, wherein the structural layer is disposed on the substrate layer, the structural layer 1 comprises a plurality of triangular prisms 5, the triangular prisms are arranged at intervals and are not connected with each other, and the surface roughness Ra of the interval region 6 is Ra<100nm, the ridge line 53 of the triangular prism presents a linear shape 5a in the longitudinal section 52, the amplitude A' is 0 μm, the cross section 51 of the triangular prism is triangular, the height H of the triangle (triangular prism) is 25 μm, the included angle α between the left oblique side and the height is 45 degrees, the included angle β between the right oblique side and the height is 45 degrees, the extension multiplying factor k of the interval opposite bottom side is 0.5
Is 0 deg..
The main properties of the novel brightness enhancement film provided by the present invention were evaluated in the following manner.
Luminance: the backlight framework is composed of the reflection film, the light guide plate, the diffusion film, the novel brightness enhancement film and the traditional brightness enhancement film, the backlight framework is lightened after being assembled with the module, the BM-7 is used for testing the average value of 9-point luminance, and compared with the traditional brightness enhancement film which is tightly arranged with 90-degree triangular prisms, the luminance loss is calculated. Evaluation grade: max [0.7, 1) > max [0.4, 0.7) > max [0.2, 0.4) > min [0.1, 0.2) > min [0.05, 0.1) > min (0, 0.05).
Collimated light transmittance novel brightness enhancement films were tested for typical wavelengths of 550nm and 940nm using a collimated light transmittance instrument, and if all triangular prism structures and gaps were the same, an ideal value could also be calculated by E/P ═ × k/(Wa + Wb) × (1+ k) ═ k/(1+ k), the actual value generally being slightly less than the ideal value, evaluation scale: max [0.7, 1) > max [0.4, 0.7) > max [0.2, 0.4) > min [0.1, 0.2) > min [0.05, 0.1) > min (0, 0.05).
Examples 2 to 30
The novel brightness enhancing film as provided in example 1, wherein the parameters are listed in table 1.
TABLE 1 parameters and Properties of examples 1-35
Note 1: the series represents the classification (grading) order of different triangular prisms in the repetition period; the number represents the number of the triangular prisms of the same class (grade) in the repeating period; if not otherwise stated, all triangular prisms are the same by default: the number of the stages is 1, and the number of the stages is 1; when the triangular prism is more than 1, the number of steps, i.e. the subscripts of all symbols, e.g. the height of the triangular prism, shall be denoted as H1、H2……；
Note 2, H is the height of a triangle (triangular prism) in unit μm, α is the angle between the left oblique side and the height, β is the angle between the right oblique side and the height in unit degree, k is the extension ratio of the interval relative to the bottom side and is a dimensionless unit, A' is the amplitude (absolute value) of the ridge line height change (+/-), and is in unit μm;
the included angle of the projection straight line of the longitudinal section and the end face of the base material is the dislocation angle of the structural layer and is unit degree; ra is the surface roughness of the spacer region in nm; E/P is the ratio of the interval to the horizontal distance, namely the theoretical proportion of the plane area, represents the theoretical collimation light transmittance, and has no dimensional unit;
from the comparison results of examples 1 to 5 in Table 1, it can be seen that the change in high H has substantially no effect on the optical properties when the other conditions are unchanged.
From the comparison results of examples 1 and 6 to 9 in table 1, it can be seen that, when the other conditions are not changed, the closer α and β are to 45 °, the less the luminance loss is relatively, i.e., the higher the luminance is.
From the comparison results of examples 1 with 10 and 11 in table 1, it can be seen that when other conditions are not changed, and the sum of α and β is not changed, the greater the difference between α and β is, the poorer the symmetry of the triangular prism is, the relatively greater the luminance loss is, i.e., the lower the luminance is, and therefore, a symmetrical structure, i.e., α and β are preferably equal.
From the comparison results of examples 1 and 12 to 20 in table 1, it can be seen that, when the extension factor k of the interval to the bottom side is increased under the same other conditions, the interval region theoretical ratio E/P is increased, the collimated light transmittance in the actual test is also increased, and the luminance loss is also increased. k is selected according to the requirements of different occasions on the allowance of luminance loss and the collimation light transmittance.
As can be seen from the comparison results of examples 1 and 21 to 30 in Table 1, when the amplitude A' of the ridge line is controlled within 0 to 2 μm under the same conditions, the morphology of the ridge line has no influence on the optical performance.
As can be seen from the comparison results of examples 1, 24 and 31 in Table 1, the amplitude A 'of the ridge line is controlled within 0 to 2 μm without changing the other conditions, and the amplitude A' has no influence on the optical properties.
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 comparison results of examples 17 and 34 in table 1, it can be seen that, when the spacing region Ra is increased, the actual collimated light transmittance is further reduced but the luminance loss is substantially unchanged when the other conditions are unchanged, whereas, when the spacing region Ra is decreased, the actual collimated light transmittance is further increased but the luminance loss is also substantially unchanged when the spacing region Ra is decreased, as can be seen from the comparison results of examples 13 and 35.
TABLE 2 parameters and Properties of examples 36 to 40
Note 1-2 in Table 1
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 triangular prisms is changed, the collimated light transmittance is not affected basically, and when H is equal to 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 ridge line configuration of different triangular prisms can be selected in different combinations, and has substantially no influence on the optics. The example variations of table 2 are generally useful for the improvement of the anti-adhesion properties of the novel brightness enhancement films.
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 (10)
1. The utility model provides a novel brightness enhancement film, its characterized in that, brightness enhancement film includes substrate layer and structural layer, the structural layer is arranged in on the substrate layer, the structural layer includes a plurality of triangular prism, triangular prism interval arrangement is interval region between the adjacent triangular prism.
2. The novel brightness enhancement film according to claim 1, wherein the spacer region is flat and smooth, the triangular prism has a triangular cross section, the sides of the triangle are confined in the space directly above the base side and do not block the collimated light from passing through the spacer region, the bottom surfaces of the triangular prisms are always parallel to each other and the longitudinal sections are always parallel to each other.
3. The novel brightness enhancement film according to claim 1, wherein the included angles between the right and left slopes of the single triangular prism and the vertical section are respectively α, β and β, the included angles between the right and left sloping sides and the height of the triangle in the cross section are respectively 15-75 degrees, and the sum of α and β forms the vertex angle θ of the triangle, and θ is 30-150 degrees.
4. The novel brightness enhancing film according to claim 1, wherein the height H of the single triangular prism is 5-100 μm; the heights of the different triangular prisms may be the same or different.
5. The novel brightness enhancement film according to claim 1, wherein the width of the single triangular prism has a base length of a triangle with a single cross section of W, wherein W is the left side projection W ═ tan (α) × H, W is the right side projection Wb ═ tan (β) × H, W ═ Wa + Wb, the interval length of the triangular prism is the length of the extension line from the base to both sides of the triangle with a single triangular prism cross section, the extension magnification is k, wherein Ea is the left side extension line k × Wa, Eb is the right side extension line k × Wb, and k has a value range of [0.01,100 ];
the interval E between the adjacent triangular prisms is the sum of the right extension Eb of the left triangular prism and the left extension Ea of the right triangular prism, E can be calculated according to E ═ (Wa + Wb) × k, the horizontal distance P of the triangular prisms is the longitudinal section distance of the adjacent triangular prisms, Wb and Eb on the right side of the longitudinal section of the left triangular prism are added with Wa and Ea on the left side of the longitudinal section of the right triangular prism, and when the triangular prisms have the same structure, P ═ Wa + Wb + Eb ═ Wa + Wb + E ═ Wa + Wb) × (1+ k).
6. The novel brightness enhancing film according to claim 1, wherein the spacer region has a surface roughness Ra of 250nm or less.
7. The novel brightness enhancement film according to claim 1, wherein the ridge line has a shape in side view selected from one or a combination of at least two of a straight line, a broken line and a curved line; the amplitude A' of the ridge line is selected from ± [0,2] μm.
8. The novel brightness enhancement film according to claim 1, wherein the projection of the longitudinal section of the triangular prism on the substrate layer is 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 structure layer
Dislocation angle
Is selected from 0 to 90 degrees.
9. A method of making a novel brightness enhancing film according to any of claims 1-8 comprising the steps of:
(1) grinding and polishing the mold until the surface is flat and smooth, and engraving a mold with a complementary structure according to the triangular prism structure, the arrangement mode and the depth direction;
(2) filling polymer resin between the mold and the substrate, and micro-copying the structural layer on the substrate layer through molding and demolding to obtain the novel brightness enhancement film with the collimated light transmission.
10. A backlight module comprising a reflective film, a light guide plate, a lower diffuser film, and a brightness enhancing film, wherein the brightness enhancing film is the brightness enhancing film sheet or combination of sheets as claimed in any one of claims 1-8; the brightness enhancement film sheet combination comprises a sheet A or a sheet B, wherein the cutting angle A of the sheet A is selected from 0-90 degrees, and the cutting angle B of the sheet B is selected from 90-180 degrees; the brightness enhancement film sheet combination is a combination of at least two of the A sheet and/or the B sheet.
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