CN111435204A - Quadrangular frustum pyramid brightness enhancement film and preparation method thereof - Google Patents
Quadrangular frustum pyramid brightness enhancement film and preparation method thereof Download PDFInfo
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- G—PHYSICS
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- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/04—Prisms
- G02B5/045—Prism arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0033—Means for improving the coupling-out of light from the light guide
- G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
- G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
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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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- 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
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- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
- G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
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Abstract
The invention relates to a novel optical film, in particular to a quadrangular frustum pyramid brightness enhancement film which is closely arranged and can transmit 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 quadrangular frustum pyramid brightness enhancement film and a preparation method thereof. Four prismatic table brightness enhancement films include substrate layer and structural layer, the structural layer is arranged in on the substrate layer, the structural layer includes four prismatic tables of a plurality of, four prismatic tables are closely arranged, four prismatic tables's cross section and vertical section all are trapezoidal, four prismatic tables's bottom surface and upper surface are the rectangle, and wherein the upper surface is the platform region, and the platform region is level and smooth, and collimated light permeable, four prismatic tables's side all limits in the space of removing the upper surface directly over the bottom surface, can not block the collimated light that the platform region sees through. The quadrangular frustum pyramid brightness enhancement film has good collimated light transmission performance.
Description
Technical Field
The invention relates to a novel optical film, in particular to a quadrangular frustum pyramid brightness enhancement film which is closely arranged and can transmit 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 lighting 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 within a central visual angle (generally within 35 degrees from the normal of the light emitting surface), so that the luminous intensity in the normal direction and the front 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 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 a brightness enhancing film with a rectangular frustum transparent to collimated light.
Disclosure of Invention
The invention provides a 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 tightly arranged, collimated light can penetrate through the four-edge table, and the 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 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, and the quadrangular frustums are closely arranged. The bottom surface of the quadrangular frustum is positioned above the base material layer.
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 is a platform area, and the platform area is flat and smooth. The collimated light may be transmitted through the land area.
The upper surface and the bottom surface of the quadrangular frustum are parallel.
The side surfaces of the quadrangular frustum pyramid are limited in a space directly above the bottom surface except the upper surface, collimated light in the platform area cannot be prevented from transmitting, the bottom surface of the quadrangular frustum pyramid is always parallel to the base material, the bottom surface of the quadrangular frustum pyramid is always parallel to the bottom surface of the base material, the cross sections of the quadrangular frustum pyramid are always parallel to each other, and the longitudinal sections of the quadrangular frustum pyramid are always parallel to each other.
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 vertical center height are α respectively1、β1，α1、β115-75 degrees, and the included angles between the front and back inclined planes of the single quadrangular frustum pyramid and the cross section, namely the included angles between the left and right inclined edges of the trapezoid of the longitudinal section and the vertical center height are α degrees respectively2、β2，α2、β2All 15-75 degrees.
Further, α of single quadrangular frustum pyramid1、β1Which may be the same or different, α2、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, α of multiple quadrangular frustum pyramid1Which may be the same or different, β1And may be the same or different, α2Which may be the same or different, β2And may be the same or different. In order to reduce the difficulty of process implementation, the same is preferred.
Further, α1And β1Is a sum of1，θ1α degree at 30-150 degree2And β2Is a sum of2，θ2Is 30 to 150 degrees.
Further, theta for different quadrangular frustums1May 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 × H, and the value range of t is [0.01,100 ]]The rectangular area of the platform is S1＝S2× t/(1+ t), side projection square ring area S4＝S2-S1＝S2/(1+t)。
The transverse width of the platform rectangle of the single quadrangular frustum pyramid is L1，L1＝[tan(α1)+tan(β1)]× G, the bottom rectangle has a transverse width W1，W1＝[tan(α1)+tan(β1)]×(H+G)。
The longitudinal width of the platform rectangle of the single quadrangular frustum pyramid is L2，L2＝[tan(α2)+tan(β2)]× G, the bottom rectangle has a longitudinal width ofW2，W2＝[tan(α2)+tan(β2)]×(H+G)。
The projection of the upper surface of the quadrangular frustum is in a rectangle of the bottom surface.
The platform area is 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 S2Ratio) due to reflection losses in the mesa region, and high surface roughness may cause 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 vertical center heights of the quadrangular frustum pyramid are arranged at intervals in the transverse direction or the longitudinal direction, and if the vertexes of the 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 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 vertical center heights of the quadrangular frustum pyramid are arranged at intervals transversely or longitudinally, and are limited below by a transverse or 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 μm.
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 during the structuring process, so that a gap is present between the substrate and the smooth outer surface of the mould, the thickness of this gap forming a meat-like layer after curing (see figure 9).
The thickness of the meat thick layer is 0.1-10 mu m.
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, t is 0.01-100, such as 0.01, 0.03, 0.05, 0.1, 0.2, 0.5, 1, 1.5, 2, 3, 4, 5, 9, 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, S1/S20.01-0.99, such as 0.01, 0.09, 0.17, 0.33, 0.5, 0.67, 0.75, 0.8, 0.9, 0.99.
Further, H is 20-25 μm, α1Is 45 degrees and β degrees1Is 45 degrees and α degrees2Is 45 degrees and β degrees2At 45 DEG, t is 0.5, A1Is 0-2 μm, A2Is in the range of 0 to 2 μm,
is 0 DEG, Ra<100nm，S1/S2Is 0.33. 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 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) and 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 collimating light-permeable quadrangular frustum pyramid brightness enhancement film.
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 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 process of using the 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 larger collimation transmittance and larger luminance loss, the precision alignment parallel stacking can keep the collimation transmittance still larger, but the luminance loss can be improved to be smaller or even smaller.
In the existing brightness enhancement film, a closely-arranged prism structure is adopted, a flat and smooth platform area is not formed, and the problem that collimated light cannot penetrate exists.
Compared with the prior art, the 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.
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 four-edged stand brightness enhancement film according to the present invention;
FIG. 4a is a schematic light path (cross-section) of a quadrangular frustum of a brightness enhancement film provided by the present invention;
FIG. 4b is a schematic diagram of an optical path (longitudinal section) of a quadrangular frustum pyramid brightness enhancement film provided by the present invention;
FIG. 5a is a schematic cross-sectional view of a four-edged stand brightness enhancement film provided by the present invention;
FIG. 5b is a schematic longitudinal cross-sectional view of a brightness enhancement film according to the present invention;
FIG. 5c is a schematic view of a projection plane of a quadrangular frustum pyramid brightness enhancement film according to the present invention;
FIG. 6a is a side view in elevation or a front view in cross-section (5 a-5 f) of a quadrangular frustum pyramid brightness enhancing film provided by the present invention;
FIG. 6b is a side view in vertical section or a front view in cross section (5 g-5 h) of a quadrangular frustum pyramid brightness enhancing film provided by the present invention;
FIG. 7 is a top view of a quad-flat brightness enhancement film provided in accordance with the present invention;
FIG. 8 is a schematic diagram of light paths (cross-section taken as an example) of 2 parallel stacks of four-edged stand brightness enhancement films according to the present invention;
FIG. 9 is a schematic view of a three-dimensional structure of a quadrangular frustum pyramid brightness enhancing film with a meat-thick layer according to the present invention;
fig. 10 is a schematic bottom projection view of a 2-high 3-low vertically and horizontally alternately arranged quadrangular frustum pyramid provided by the invention.
Wherein:
0: a substrate layer;
1: a structural layer;
2: a meat thickness layer;
3: a conventional brightness enhancement film;
4: a 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;
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: a bevel area in a cross section of the quadrangular frustum of a pyramid brightness enhancement film;
43: a plateau region in a cross section of the quadrangular frustum of a prism brightness enhancement film;
44: a bevel area in the longitudinal section of the quadrangular frustum pyramid brightness enhancement film;
46: a plateau region in a longitudinal section of the quadrangular frustum of a 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.
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.
As shown in fig. 3, which is a schematic view of a three-dimensional structure of a four-edged stand brightness enhancement film 4 provided by the present invention, 0 is a substrate layer, 1 is a structural layer, and all four-edged stands 5 in the structural layer are closely arranged. When the incident collimated light 9 propagating from top to bottom passes through the structural layer, the platform region does not destroy the collimation of the light, so that a certain degree of collimation is maintained, namely, the incident collimated light has better collimated light transmittance. As shown in fig. 4a (4b), the schematic diagram of the light path of the cross section 51 (longitudinal section 52) of the four-edged stand brightness enhancement film shows that when the incident collimated light 9 (solid line) passes through the cross section (longitudinal section), the inclined surface region 41 (inclined surface region 44) divides the incident light into refracted light in two directions, and forms emergent light 91 (dotted line) with damaged collimation, but when the incident collimated light 9 passes through the flat land region 43 (flat land region 46) in the cross section (longitudinal section), the flat region formed by the flat land regions 43 and 46 keeps the incident light in the original propagation direction and arrangement sequence, and forms emergent light 92 (solid line) with undamaged collimation, and provides the whole brightness enhancement film with collimated light transmittance, so that the four-edged stand 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 brightness enhancement film of the invention comprises a substrate layer 0 and a structural layer 1, wherein the structural layer 1 comprises a plurality of rectangular frustums 5, the rectangular frustums are closely arranged, and the surface roughness Ra of the upper surface 53 of the rectangular frustums<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 A20 μm, the cross section 51 of the quadrangular frustum pyramid is trapezoidal, and the included angle α between the left oblique side and the height in the cross section1Is 45 degrees, and the right bevel edge forms an included angle β with the height145 degrees, the longitudinal section 52 of the quadrangular frustum pyramid is trapezoidal, and the left inclined edge in the longitudinal section forms an included angle α with the height2Is 45 degrees, and the right bevel edge forms an included angle β with the height245 degrees, the vertical extension magnification t of the vertical center height is 0.1, and the dislocation angle of the structural layer
Is 0 deg..
The main properties of the quadrangular frustum brightness enhancement film provided by the present invention were evaluated in the following manner.
Luminance: the backlight module comprises a backlight framework composed of a reflecting film, a light guide plate, a diffusion film and a quadrangular frustum brightness enhancement film or a traditional brightness enhancement film stack (two orthogonal traditional brightness enhancement films, wherein the brightness enhancement structure is a closely-arranged triangular prism with a vertex angle of 90 degrees), the backlight framework is assembled with a module and then is lightened, and the BM-7 is used for testing an average value of 9-point luminance and the average value of the 9-point luminance and the traditional brightness enhancement film stackComparing the structure of the traditional brightness enhancement film stack, calculating the brightness loss (the brightness loss can be S)1/S2Calculate 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 quadrangular frustum pyramid brightness enhancement film was tested for typical wavelengths of 550nm and 940nm using a collimated light transmittance instrument. 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, then S1/S2The actual value is typically slightly less than the ideal value, i.e., T/(1+ T) — 1-1/T. 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
A four-edged stand 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 quadrangular frustum in the quadrangular frustum 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… …, Note 2: α in the cross section of a quadrangular frustum1Angle of left oblique side to height, β1Is the included angle between the right bevel edge and the height, and is unit degree; rectangular frustum of prismIn the noodle, α2Angle of left oblique side to height, β2Is the included angle between the right bevel edge and the height, and is unit degree; t is the vertical extension multiplying power of the vertical center height, and 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 segment of the longitudinal section on the substrate layer and the projection straight line of the substrate end face is the dislocation angle of the structural layer and is unit degree; ra is the surface roughness of the upper surface of the rectangular frustum pyramid and the spacing region in nm; s1/S2The ratio of the rectangular area of the platform to the rectangular area of the bottom surface, 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 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 other conditions were not changed, α was observed1And β2The closer to 45 °, the less the luminance loss is, i.e., the higher the luminance is α2And β2The same is true.
From the comparison of example 1 with examples 10 and 11 in Table 1, it can be seen that when α1And β1When the sum of (c) is constant, when α1And β1The larger the difference, the poorer the symmetry of the quadrangular frustum, and the relatively larger the luminance loss, i.e., the lower the luminance, so the symmetrical structure, i.e., α, is preferable1And β1Equal α2And β2The same is true.
From the comparison results of examples 1 and 12 to 20 in table 1, it can be seen that, when other conditions are not changed, the theoretical ratio of the plane area is continuously increased when t is increased, the transmittance of the collimated light in the actual test is also continuously increased, and the luminance loss is also continuously increased. t is selected according to the requirements of different occasions on the tolerance of luminance loss and the collimation light transmittance.
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 trace line shape in table 2 represents the jitter relationship between the quadrangular frustums of the same order, which is the same orderFig. 10 is a schematic diagram showing a projection of the bottom surface of a 2-high-3-low alternating rectangular platform of example 39, the minimum repeating unit (solid line region) of the projection includes total rows ×, namely, 5 × 5 ═ 25 rectangular platforms, wherein the bottom surface of the 1-level rectangular platform is represented by a solid rectangle, and the bottom surface of the 2-level rectangular platform is represented by a hollow rectangle, and the weighted average is a weighted average of theoretical occupation ratios of the platform regions of the different levels of rectangular platforms, namely Σ S1/ΣS2(ii) a 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 were not changed, the collimated light transmittance was influenced by the weighted average of the ratios of the planar regions of the four-sided truncated pyramid in different stages by changing only the number and the number of the four-sided truncated pyramid, and when H was 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 shapes of different quadrangular frustum pyramid can be selected in different combinations, and the optical property is not affected. The example variations of table 2 are generally useful for the improvement of the adsorption resistance of a quadrangular frustum of a brightness enhancement film.
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 (11)
1. The utility model provides a four terrace with edge brightness enhancement film which 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 four terrace with edge, four terrace with edge closely arrange.
2. The brightness enhancing film according to claim 1, wherein the cross section and the longitudinal section of the quadrangular frustum are trapezoidal, the bottom surface and the upper surface of the quadrangular frustum are rectangular, and the upper surface is a flat and smooth flat area.
The side surfaces of the quadrangular frustum pyramid are limited in a space right above the bottom surface except the upper surface, and cannot block collimated light in the platform area from transmitting, the bottom surface of the quadrangular frustum pyramid is always parallel to the base material, the bottom surface of the quadrangular frustum pyramid is always parallel to the bottom surface of the base material, the cross sections of the quadrangular frustum pyramid are always parallel to each other, and the longitudinal sections of the quadrangular frustum pyramid are always parallel to each other;
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; the projection of the platform of the quadrangular frustum pyramid on the bottom surface is also rectangular, and the projection rectangle and the bottom surface rectangle are parallel to each other; 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.
3. The brightness enhancing film according to claim 1, wherein the angle between the right and left slopes of the single quadrangular frustum pyramid and the vertical section, i.e. the angle between the right and left sloping sides of the trapezoid in cross section and the vertical center height, is α1、β1，α1、β1Are all 15-75o；α1And β1Is a sum of1，θ1Is 30 to 150oThe 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 α respectively2、β2，α2、β2Are all 15-75o；α2And β2Is a sum of2，θ2Is 30 to 150o。
4. The brightness enhancing film according to claim 1, wherein the vertical center height H of the single quadrangular frustum is 5-100 μm; the vertical center heights of different quadrangular tables are the same or different.
5. The brightness enhancing film according to claim 1, wherein the rectangular area of the bottom surface of the single quadrangular frustum is S2The 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 × H, and the value range of t is [0.01,100 ]]The rectangular area of the platform is S1＝S2× t/(1+ t), side projection square ring area S4＝S2-S1＝S2(1+ t) the transverse width of the platform rectangle of the single quadrangular frustum is L1，L1＝[tan(α1)+tan(β1)]× G, the bottom rectangle has a transverse width W1，W1＝[tan(α1)+tan(β1)]× (H + G), the longitudinal width of the platform rectangle of the single quadrangular frustum is L2，L2＝[tan(α2)+tan(β2)]× G, the bottom rectangle has a longitudinal width W2，W2＝[tan(α2)+tan(β2)]×(H+G)。
6. The brightness enhancing film according to claim 2, wherein the projection of the upper surface of the truncated pyramid is within a rectangle of the bottom surface.
7. The brightness enhancing film according to claim 1, wherein the mesa region has a surface roughness Ra of 250nm or less.
8. The brightness enhancing film according to claim 1, wherein the truncated perpendicular heights of the truncated quadrangular frustum are arranged in a horizontal or vertical direction, and if the vertices of the truncated perpendicular heights of the truncated quadrangular frustum are connected in the horizontal and vertical directions to form a virtual line (or virtual trace line), the truncated rectangular heights of the truncated quadrangular frustum are connected in the horizontal and vertical directions to form a virtual trace lineThe vertical center height of the prism table is positioned below a horizontal or longitudinal virtual connecting line, and the virtual connecting line is selected from one or the combination of at least two of straight lines, broken lines, curves, intermittent broken lines and intermittent curves; amplitude A of the horizontal virtual link1Amplitude A of the vertical virtual line is 0-2 μm2Is 0-2 μm.
9. The brightness enhancement film according to claim 1, wherein the projected line segments of the vertical sections of the quadrangular frustum pyramid on the substrate layer are connected to form a straight line A, the projected line segments of the end faces of the substrate layer are connected to form a straight line B, and the included angle between the straight line A and the straight line B is referred to as the dislocation angle of the structure layer
Dislocation angle
Selected from 0 to 90o。
10. A method of making a quadrangular frustum brightness enhancing film according to any one of claims 1-9, comprising the steps of:
(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) and 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 collimating light-permeable quadrangular frustum pyramid brightness enhancement film.
11. A backlight module comprising a reflective film, a light guide plate, a lower diffuser film, and a brightness enhancing film selected from the brightness enhancing film sheet or combination of sheets as claimed in any one of claims 1-9; the cutting angle C of the brightness enhancement film sheet is selected from 0-90 DEG Co(ii) a The brightness enhancement film sheet combination is a combination of at least two sheets.
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