CN110389475A - Optical sheet, optical texture, backlight module and display device with protrusion - Google Patents
Optical sheet, optical texture, backlight module and display device with protrusion Download PDFInfo
- Publication number
- CN110389475A CN110389475A CN201910305606.9A CN201910305606A CN110389475A CN 110389475 A CN110389475 A CN 110389475A CN 201910305606 A CN201910305606 A CN 201910305606A CN 110389475 A CN110389475 A CN 110389475A
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- China
- Prior art keywords
- protrusion
- optical sheet
- optical
- ontology
- colloid layer
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
-
- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
Abstract
A kind of optical sheet with protrusion, optical texture, backlight module and display device.Optical sheet includes: an ontology, has a first surface；And multiple protrusions, on first surface and protrude from first surface, protrusion is 0.03%~35% in the proportion of first surface, having a spacing (pitch) between protrusion is 0.5mm~10mm, and it is 0.01 μm~0.1 μm that part of the first surface other than protrusion, which has one first center line average roughness Ra,.
Description
Technical field
The present invention relates to a kind of optical sheet, optical texture, backlight module and display devices, and in particular to can be used as diffusion
A kind of optical sheet with protrusion, optical texture, backlight module and the display device of plate.
Background technique
Diffuser plate is a kind of optical sheet applied to electronic product such as display device, and main function is by the light of light source
Diffusion atomization, makes product screen that the image quality of brightness uniformity be presented.And different electronic products are different for screen image quality demand, therefore
When diffuser plate manufacturer manufactures diffuser plate, the diffusion with different light penetrations can be produced according to the demand of downstream manufacturers
Plate.For being applied to the side direction type backlight module of display device (such as liquid crystal display device), generally comprise by translucent material
The light guide plate of formation, is located at light guide plate at the light source (such as linear light source of cold-cathode tube formation) that light guide plate side end is arranged in
With the diffuser plate and/or eyeglass film (lens of optical reflection film and configuration the formation light-emitting surface on light guide plate below linear light source
film)。
It mostly can be especially in expansion in recent years in color liquid crystal display arrangement in order to improve luminance and reduce consumption electric power
The upper surface of fall apart or diffuser plate and light guide plate between 1 or 2 surfaces of configuration there are the eyeglass films of prism shape, make from light guide plate
The light of injection efficiently optically focused on the positive direction of liquid crystal display panel.Also, in order to improve because caused by a distance between light source
Luminous quantity it is uneven, also having technology is that printing is formed by light diffusion ink and can be become larger with separate light source inside light guide plate
The configuration of dot pattern, diffuser plate is then so that light equably spreads and sees the dot pattern being printed on inside light guide plate not
See as the main purpose.The Embossing processing for being produced by thermoplastic resin plate of the previous grade eyeglasses film is hard using radioactive ray
The methods of the transcription of prism shape of change type resin is reached.But these existing eyeglass film manufacturing costs are high and are considered as constituting
The expensive main cause of backlight module, in addition, existing eyeglass film also makes material select model because being limited to its manufacturing method
It encloses and is excessively narrow.Furthermore eyeglass film also has and must be applied in combination with optical diffusion film because not having light diffusion effect, backlight mould is caused
The complicated problem of the assembling steps of block.
In addition, in addition to be above set forth in display device in be also possible to other than diffuser plate using a variety of functional films arrived as spread
Film, eyeglass film, luminance improve film, aobvious in order to reach to improve the luminance of display picture and reduce the luminance nonuniformity of picture entirety
The purpose of showing device is lightening and reduces cost is to be absorbed in develop the optics for integrating multiple functions today there is also many research
Plate, for example, integrate diffuser plate light diffusion effect and brightness enhancement film light collecting effect at an optical sheet developmental research.Especially
Recently enlargement is proceeded to from small-sized due to display device (such as LCD TV), prefer to develop and can reduce used in
Functional film quantity but the optical diffusing plate that luminance and diffusion can be improved.
Summary of the invention
The purpose of the present invention is to provide a kind of optical sheet (optical plate), optical texture, backlight module and displays
Device, the protrusion with special designing can improve the equal Qi Du (uniformity of luminance when can make using as diffuser plate
of luminance)。
According to the present invention it is proposed that a kind of optical sheet, comprising: an ontology has a first surface；And multiple protrusions,
On first surface and first surface is protruded from, protrusion is 0.03%~35% in the proportion of first surface, protrusion
Having a spacing (pitch) between portion is 0.5mm~10mm, and part of the first surface other than protrusion has in one first
Heart line average roughness Ra is 0.01 μm~0.1 μm.
Wherein, an outer diameter of protrusion is 200 μm~500 μm.
Wherein, protrusion includes that a recessed portion is formed between at least two vertex of protrusion.
Wherein, optical sheet is made of translucent resin, and the bending modulus of translucent resin is greater than 1GPa.
Wherein, one of protrusion includes a convex block and an annulus, and annulus is located at the underbump, annulus
It surrounds and connects convex block.
The present invention provides a kind of optical texture, and optical sheet, an optical film including previous embodiment are set to the of ontology
The top on one surface and colloid layer are set between optical sheet and optical film, and wherein colloid layer binds those protrusions
Top surface, and there is an air layer between first surface and colloid layer.The present invention provides a kind of optical texture, including previous embodiment
Optical sheet, an optical film and colloid layer.Optical sheet includes an ontology and several protrusions.Ontology has a first surface.
Protrusion protrudes from first surface, and the one of them of protrusion is 200 μm~500 μm with an outer diameter and a maximum height is 10
μm~35 μm, having a spacing between two adjacent protrusions is 0.5mm~10mm.Optical film is set to the first surface of ontology
Top.Colloid layer is set between optical sheet and optical film, and colloid layer binds the top surface of protrusion, and first surface and colloid
There is an air layer between layer.
Wherein, protrusion includes a recessed portion, has an air layer between a bottom of recessed portion and colloid layer.
The present invention provides a kind of backlight module, optical sheet or previous embodiment including a light source and previous embodiment
Optical texture setting corresponding with light source.
Wherein, light source setting corresponding with first surface.
The present invention provides a kind of display device, the backlight module including previous embodiment.Wherein, the display device is selected from
In as TV, notebook personal computer, removable computer and group composed by the monitor for computer.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is the partial schematic diagram of an optical sheet of one embodiment of the invention.
Fig. 2A is the diagrammatic cross-section along the protrusion that a hatching 2-2 is painted in Fig. 1.
Fig. 2 B is the schematic diagram of the single protrusion of Fig. 1.
Fig. 3 A~Fig. 3 D draws several exemplary schematic diagrames that protrusion surface is curved surface.
Fig. 4 A~4C draws several exemplary schematic diagrames that protrusion is cone cell convex block.
Fig. 5 A~5C draws several exemplary schematic diagrames that protrusion has top surface.
Fig. 6 A~6K draws several exemplary schematic diagrames that protrusion has recessed portion.
Fig. 7 A~7B draws the schematic diagram with the protrusion of step structure.
Fig. 8 draws the schematic diagram that multiple protrusions are distributed in the main body of the optical sheet of an embodiment according to the present invention.
Fig. 9 is the partial schematic diagram of an optical sheet of another embodiment of the present invention.
Figure 10 is the diagrammatic cross-section along another protrusion that a hatching 10-10 is painted in Fig. 9.
Figure 11 A is painted a kind of schematic diagram of backlight module of the optical sheet using one embodiment of the invention.
Figure 11 B is painted the schematic diagram of another backlight module of the optical sheet using one embodiment of the invention.
Figure 12 A is painted the schematic diagram being bonded using the optical sheet of one embodiment of the invention with an optical film.
Figure 12 B for the optical sheet and optical film drawn of the hatching 12B-12B along Figure 12 A diagrammatic cross-section.
Figure 12 C for the hatching 12B-12B along Figure 12 A optical sheet and optical film drawn another state sample implementation
Diagrammatic cross-section.
Wherein, appended drawing reference:
1: optical sheet
10: ontology
101: the first surface of ontology
102: the second surface of ontology
20,20-1,20-2,20-3,20-4,20-5,30: protrusion
20R: recessed portion
20u: top surface
201: protrusion surface
30B: convex block
30R: annulus
Dp: spacing
Dm: outer diameter
α: inclination angle
HD: recessed depth
Hp: maximum height
The shortest distance between Ds: two adjacent protrusions
Hm: the thickness of ontology
400: backlight module
410: diffuser plate
420: light source
422: substrate
424: luminescence unit
440: frame
442: accommodating space
OP: optical film
71: colloid layer
73: diffusion barrier
74: prism layer
80: air layer
Lad: the thickness of colloid layer
Lgap: the distance between optical film to first surface
P: protrusion vertex
Specific embodiment
Structural principle and working principle of the invention are described in detail with reference to the accompanying drawing:
The embodiment of the present invention proposes a kind of optical sheet (optical plate), can be applied to a display device as back
The diffuser plate of optical module.The optical sheet of embodiment is using the protrusion (protrusion) formed in body surfaces and to reduce
The design of surface roughness improves the equal Qi Du of luminance (the uniformity of luminance of display device light emitting region；Example
Such as the equal Qi Du in quadrangle).Therefore, a diffuser plate with high diffusibility energy can provide according to embodiment, reducing other tradition is made
Functional film quantity, and then reduce cost and make using more lightening (the especially display of big size of display device
Device).When the optical sheet of Application Example is as diffuser plate, body surfaces (e.g. first surface) court with protrusion can be enabled
To the light source of backlight module, it can also enable a rougher back side (e.g. second surface) of main body towards the light source of backlight module.
State sample implementation is described in detail referring to appended attached drawing.It is noted that structure that embodiment is proposed and interior
Appearance is used by way of example only, and the range to be protected of the present invention is not limited only to those described aspects.In embodiment it is identical or
Similar label is to indicate same or similar part.It is noted that the present invention not shows all possible implementation
Example.Can structure be changed and be modified without departing from the spirit and scope of the present invention, to meet needed for practical application.Cause
This, may not also can apply in other state sample implementations proposed by the present invention.Furthermore attached drawing has simplified clearly to be illustrated to implement with benefit
The content of example, the dimension scale on figure are not drawn according to actual product equal proportion.Therefore, specification and diagramatic content are only chatted
It states embodiment to be used, rather than is used as the scope of the present invention is limited.
Furthermore the word of ordinal number such as " first ", " second ", " third " etc. used in specification and claim,
The element in order to modify claim, itself and unexpectedly contain and represent the request element have it is any before ordinal number, also not
The sequence or the sequence in manufacturing method for representing a certain request element and another request element, the use of those ordinal numbers are only used
To enable the request element with certain name to be able to make clear differentiation with another request element with identical name.Again
The word for the space correlation that may be used in person, specification and claim, such as " under " (beneath), " lower section "
(below), " lower " (lower), " top " (above), " higher " (upper) or similar word are for being convenient for chatting
It states and referring to the wherein spatial relationship between an element or feature and another element or feature drawn as shown.Therefore have logical
Normal skill is it is found that the word of those space correlations has further included element in use in addition to including element orientation as shown in the figure
Or different from the orientation of diagram when operation.Therefore, specification is with those words used in claim only to describe reality
It applies example to be used, rather than is used to limit the scope of the present invention.
Fig. 1 is the partial schematic diagram of an optical sheet of one embodiment of the invention.Fig. 2A is along a hatching 2-2 in Fig. 1
The diagrammatic cross-section for the protrusion being painted.Fig. 2 B is the schematic diagram of the single protrusion 20 of Fig. 1.Referring to Fig. 1 and figure
2A.The optical sheet 1 of one embodiment includes that an ontology (main body) 10 and multiple protrusions (protrusion) 20 are located at ontology
On 10 first surface 101 and protrude from first surface 101.Wherein, there is a spacing (pitch) Dp between those protrusions 20
For 0.5 millimeter of (mm)~10mm, during the period away from optical sheet can be made to maintain higher luminance to show and can avoid in transport in range
Or first surface 101 is caused to scratch because of friction in assembling process.In an example, the spacing that has between those protrusions 20
Dp is 0.5mm~9mm；In another example, Dp is 0.5mm~8mm.Part of the first surface 101 other than protrusion 20 is
Smooth surface.In one example, part of the first surface 101 other than protrusion 20 has one first center line average roughness
(mean roughness) Ra, Ra value is e.g. 0.01 micron (μm)~0.1 μm, when Ra value is at 0.01 μm~0.1 μm
Diffuser plate can be made to have the good equal Qi Du in quadrangle.In an example, the first center line average roughness Ra of first surface 101 is for example
It is no more than about 0.08 μm, that is, about 0.08 μm or is lower than 0.08 μm.In another example, 10 points of first surface 101 are average
The range of roughness (ten-point mean roughness) Rz is 0.1 μm~1 μm, e.g. 0.5 μm~1 μm.Show in one
In example, ontology 10 is e.g. integrally formed with protrusion 20.
In one embodiment, protrusion 20 has a maximum height Hp between protrusion vertex P and first surface, maximum high
Spend Hp range between 10 μm~35 μm, e.g. between 12 μm~30 μ ms, or 15 μm~27 μ ms it
Between.In one example, the maximum height Hp (unrestrictedly) of protrusion 20 is about 19.32 μm；In another example, protrusion 20 is most
Big height Hp (unrestrictedly) is about 16.46 μm.Furthermore by taking single protrusion 20 as an example, the outer diameter D m of protrusion 20 is defined as
One maximum gauge of the bottom surface of the protrusion 20 contacted with the first surface 101 of ontology 10.And between above-mentioned protrusion 20 between
One that the shortest distance Ds between the outer diameter D m of those protrusion one of them and two adjacent protrusions 20 is then defined as away from Dp is total
The summation for being Dm and Ds with, i.e. Dp.In an embodiment, the bottom surface of the protrusion 20 contacted with first surface 101 is substantially in
Circle, outer diameter D m range are 200 μm~500 μm, e.g. 250 μ~450 μm or 270 μm~400 μm.In one example,
The outer diameter (unrestrictedly) of protrusion 20 is about 310.51 μm.
In one embodiment, the ratio Hp/Dm range of the maximum height Hp and outer diameter D m of protrusion 20 are 0.01~0.2, example
In this way between 0.01~0.18 range, or between 0.02~0.175 range.In one example, the Hp/Dm's of protrusion 20
Ratio (unrestrictedly) is about 0.062；In another example, the ratio (unrestrictedly) of the Hp/Dm of protrusion 20 is about 0.053.
In addition, the surface of a protrusion 20 and the first surface 101 of ontology 10 form an inclined angle alpha in embodiment.Such as figure
Shown in 2A, an inclined angle alpha is formed between the bottom outer most edge and protrusion vertex P of a protrusion 20, in 2 degree~10 degree ranges
Between, e.g. 2.5 degree~9 degree or 3 degree~8 degree.In one example, the inclination angle (unrestrictedly) of protrusion 20 is about 5.2
Degree.
In one embodiment, the protrusion surface 201 of protrusion 20 has curved surface.As shown in Figure 1, protrusion 20 is convex block
(bumps), external form may be certain a part of sphere.Therefore, in an embodiment, protrusion 20 is on first surface 101
Be projected as circle, protrusion 20 has curved surface of the radius of curvature between 300 μm to 1000 μm, e.g. 400 μm to 900
μm or 450 μm to 850 μm.In one example, a radius of curvature (unrestrictedly) for protrusion 20 is about 640 μm.
As shown in Figure 2 B, the protrusion 20 of the present embodiment be sphere a part, protrusion 20 in first surface 101 (not
Be illustrated in Fig. 2 B) on projection it is rounded.Protrusion surface 201 includes a curved surface, and curved surface top end is protrusion vertex P, inclination
Angle α is the angle of protrusion vertex P and first surface 101, such as folded acute angle.The right embodiment of the present invention does not limit protrusion
20 be a part of sphere, can have other types of geometry kenel, is further illustrated below with Fig. 3 A~Fig. 7 B.
Fig. 3 A~3D draws other examples that protrusion surface 201 is curved surface.Please also refer to Fig. 3 A~3B, protrusion 20 is in
Projection on one surface 101 (not being illustrated in Fig. 3 A~3B) is arc-shaped, and protrusion surface 201 includes a curved surface and an inclined-plane, curved surface
Connect with inclined-plane and the two connects highest point for protrusion vertex P, inclined angle alpha is then the angle on inclined-plane Yu first surface 101, such as
Folded acute angle.C~3D referring to figure 3., being painted protrusion surface 201 is the example that two curved surfaces connect, in Fig. 3 C, protrusion surface
201 include two curved surfaces to connect, and the highest point that connects is protrusion vertex P, and inclined angle alpha is then protrusion vertex P and first surface
101 angle.Fig. 3 D is then painted the example that an inclined-plane is additionally comprised in addition to two curved surfaces connect.For example, Fig. 3 D includes three tables altogether
Face, inclined angle alpha is the angle on inclined-plane and first surface 101 in Fig. 3 D.
In one embodiment, protrusion 20 includes curved surface, and inclined angle alpha is the folder of protrusion vertex P and first surface 101
Angle；In another embodiment, protrusion 20 includes inclined-plane, and inclined angle alpha is the angle on inclined-plane and first surface 101.
In one embodiment, as shown in figs. 4 a-4 c, protrusion 20 is cone cell convex block, and protrusion vertex P is located at cone cell cusp.
Please also refer to Fig. 4 A, protrusion 20 has curved surface in the circle that is projected as on first surface 101, protrusion surface 201.Please refer to figure
4B and Fig. 4 C, protrusion 20 can be polygon, quadrangle shown in e.g. Fig. 4 B, as just in the projection on first surface 101
Triangle shown in rectangular or rectangle or Fig. 4 C.As shown in Fig. 4 B~4C, in an embodiment, protrusion surface 201 is by multiple
Inclined-plane composition, and it is tower-like in pyramid or triangle, and inclined angle alpha is the folder for constituting the inclined-plane and first surface 101 of protrusion surface 201
Angle.In another embodiment, protrusion surface 201 can be made of multiple curved surfaces, and inclined angle alpha is formed in protrusion vertex P and
Between one surface 101.
In one embodiment, protrusion 20 is in the projection on the first surface 101 of ontology 10, i.e. protrusion 20 and ontology 10
20 bottom surface of protrusion that first surface 101 contacts is in regular shape, circle, rectangular, triangle shown in e.g. Fig. 4 A~4C
Or other polygons etc., the area of the regular shape and ratio range (the i.e. area/perimeter of perimeter square2) be 0.03~
0.08, e.g. 0.039 (triangle)~0.0796 (circle).
In one embodiment, it may include a top surface 20u, top surface 20u that A~5C, protrusion 20, which are raised platform, referring to figure 5.
It is a flat surface, at this point, protrusion vertex P is then any point in the 20u of top surface.
In one embodiment, protrusion 20 includes a recessed portion 20R, and recessed portion 20R is formed in the center of protrusion 20,
It can be considered and formed from 20 top of protrusion to lower recess.The bottom of recessed portion 20R is concave point 20R1 or plane 20R2, therefore
At around recessed portion 20R, i.e. recessed portion 20R is formed between at least two vertex P vertex p-shaped.As shown in Fig. 6 A~6B, protrusion
Portion 20 has a concave point 20R1 between two vertex P, and vertex P is the recessed depth H of protrusion 20 at a distance from concave point 20R1D.One
In embodiment, the recessed depth H of protrusion 20DWith the ratio ((H of maximum height HpD/Hp)100%) can between for 15%~
Between 100%, e.g. 30%~100% or 50%~90%.As shown in Fig. 6 C and 6D, the bottom of recessed portion 20R is one
There can be multiple vertex P around plane 20R2, recessed portion 20R, in this embodiment, multiple vertex P are circularized around arrangement.Yu Yi
In embodiment, as shown in Figure 6 C, (the not being illustrated in Fig. 6 C) system of first surface 101 of plane 20R2 opposing body 10 is prominent.In another
In one embodiment, plane 20R2 can be coplanar with first surface 101.As shown in Figure 6 D, Fig. 6 C is painted along the section view of 6D-6D '
Figure, in this embodiment, protrusion surface 201 is curved surface, and protrusion vertex P then falls in curved surface highest point, the protrusion of ring structure
There is multiple protrusion vertex P, these protrusion vertex P to be arranged in ring structure in portion, and the first of plane 20R2 opposing body 10
101 system of surface is prominent.Such as Fig. 6 E) shown in, it is painted another signal of Fig. 6 C along 6D-6D ' cross-sectional view, is existed with Fig. 6 D difference
In the protrusion surface 201 of Fig. 6 E is inclined-plane.In an embodiment, recessed portion 20R can (Fig. 6 D be drawn with dotted line with first surface 101
System) connect, at this point, protrusion 20 forms a ring structure, i.e. the plane 20R2 of recessed portion 20R and first surface 101 is coplanar.
Fig. 6 F to Fig. 6 H is please referred to, recessed portion 20R is painted and connects with first surface 101 (not being illustrated in Fig. 6 F to Fig. 6 H) or coplanar
Schematic diagram, in an embodiment, the protrusion 20 as shown in Fig. 6 F and Fig. 6 G is in circular ring shape；In another embodiment, protrusion 20 can
To be that polygon is annular, quadrangle as shown in figure 6h is annular.Fig. 6 I is please referred to, is painted Fig. 6 F along the cross-sectional view of 6I-6I ', in
In this embodiment, protrusion surface 201 is curved surface, and protrusion vertex P is curved surface highest point, and the protrusion 20 of ring structure has more
A protrusion vertex P, these protrusion vertex P are arranged in ring structure.Referring again to Fig. 6 J, Fig. 6 F is painted along 6I-6I ' section view
Another signal of figure, the difference is that, the protrusion surface 201 of Fig. 6 J is inclined-plane with Fig. 6 I.Fig. 6 K is please referred to, Fig. 6 G is painted
Along a signal of 6K-6K ' cross-sectional view, in this embodiment, the concave point 20R1 of recessed portion 20R and connect with first surface 101.
In one embodiment, protrusion 20 be can be with stair-stepping " convex " shape structure, can as shown in Fig. 7 A and Fig. 7 B
It is one of the forming or 2 has the structure that various sizes of above structures are formed through storehouse, e.g. storehouse difference size
Fig. 5 A~5C and Fig. 2 B structure.
In one embodiment, the protrusion surface 201 of protrusion 20 is smooth surface, e.g. smooth surface.Certainly, above-mentioned
The size of protrusion 20, inclination angle and demand and design when the visual practical application of radius of curvature and be varied and adjust,
It is not limited to above-mentioned numerical value, therefore the present invention to this and is seldom restricted.In an example, between each protrusion 20
Size, inclination angle and radius of curvature it is roughly the same, and have well-regulated shape；Certainly, also probably due to process variation and summary
There is difference slightly, as long as all belonging to feature of the invention in the scope of the present invention.
The thickness Hm with a thickness of ontology 10 of optical sheet 1 adds the height Hp of protrusion 20, when using optics of the invention
Plate 1 as backlight module diffuser plate when, optical sheet 1 with a thickness of 0.5mm~6mm when be preferred.Thickness is more than 6mm may
It should not be used in and pursued in lightening display device now because thickness is blocked up and preponderance, it may when thickness ratio 0.5mm is thin
Diffusion effect when application can be influenced because of rigidity deficiency.In an embodiment, optical sheet 1 with a thickness of 0.6mm~5mm
Between (600 μm~5000 μm) range；In another embodiment, optical sheet 1 with a thickness of 0.8mm~3mm.In another embodiment,
Optical sheet 1 with a thickness of 0.8mm~2.5mm.And since the height Hp of protrusion 20 is little compared to the thickness Hm of ontology 10, because
The thickness (i.e. the height Hp that body thickness Hm adds protrusion 20) of this optical sheet 1 can be considered the thickness for being approximately or equal to ontology 10
Hm。
Fig. 8 draws the schematic diagram that multiple protrusions are distributed in the main body of the optical sheet of an embodiment according to the present invention.One
In embodiment, multiple protrusions 20 are, for example, the first surface 101 that can equably arrange (regularly) and be distributed in ontology 10
On.As shown in figure 8, being located at 20 Heterogeneous Permutation of protrusion arranged up and down.And in this example, as figure centre circle selects amplifier section can be considered
Protrusion 20 arrange a repetitive unit, and a repetitive unit include positioned at four corners each 1/4 protrusion 20-1,
20-2,20-3,20-4 and 1 centrally located protrusion 20-5, totally 2 protrusions 20 after aggregation.And this single a repetition
Protrusion in unit is arranged similarly to the arrangement of the face-centered cubic in lattice.In one embodiment, regularly arranged protrusion
The ratio for accounting for whole protrusions is 90% or more, e.g. 95% or more, i.e. the repetition ratio of repetitive unit is up to 9 one-tenth or more.
In an embodiment, protrusion 20 relative to the first surface 101 of ontology 10 proportion be 0.03%~
35%, e.g. 0.07%~32%.In one example, a proportion (unrestrictedly) for protrusion 20 is about 0.30%.Separately
In one example, a proportion (unrestrictedly) for protrusion 20 is about 1.21%.In another embodiment, an institute of protrusion 20
Accounting example (unrestrictedly) is about 4.83%.Protrusion 20 can pass through relative to the proportion of the first surface 101 of ontology 10
Distribution as shown in Figure 8 and calculate, for example, can be according to the occupied areas of 2 protrusions 20 divided by the area of a repetitive unit
And calculate the accounting (proportion, and can be described as the distribution density of protrusion) of protrusion.
With the outer diameter D m of single protrusion for 310 μm (radius is similar to 155 μm) and the space D p between protrusion 20
For 5000 μm (i.e.5mm), then area=2 × 5000 of a repetitive unit2, area π × 155 of protrusion2=
75477μm2And the accounting of protrusion are as follows:
(2×75477)÷(2×50002)=0.30%.
With the outer diameter D m of single protrusion for 310 μm (radius is similar to 155 μm) and the space D p between protrusion 20
For 2500 μm (i.e.2.5mm), then area=2 × 2500 of a repetitive unit2, and the accounting of protrusion are as follows:
(2×75477)÷(2×25002)=1.21%.
With the outer diameter D m of single protrusion for 310 μm (radius is similar to 155 μm) and the space D p between protrusion 20
For 1250 μm (i.e.1.25mm), then area=2 × 2500 of a repetitive unit2, and the accounting of protrusion are as follows:
(2×75477)÷(2×12502)=4.83%.
In an embodiment, the proportion of the first surface 101 other than protrusion 20 is 65%~99.97%, such as
It is 68%~99.93%.
Compared to the micro-structure of existing diffuser plate, embodiment of this case is such as single because of the protrusion 20 with larger size
Outer diameter D m (the bottom surface maximum characteristic size such as diameter) range of protrusion 20 is 200 μm~500 μm, and spacing reaches 0.5mm
(=500 μm)~10mm (=10000 μm)；And the single micro-structure of existing diffuser plate is, for example, a few micrometers to 30 microns,
And spacing only has several microns to 300 microns or less.Therefore, small compared to the microstructure size of existing diffuser plate and distribution is close, real
Apply that 20 size of protrusion of the optical sheet of example is bigger and distribution is more loose.Such larger size of arranging in pairs or groups simultaneously is distributed loose protrusion
20 and the roughness of first surface 101 is controlled, light reflectance can be increased whereby, and then promote the equal Qi Du of luminance.In addition, in
Under this design, even if it is as shown in Figure 1 regularly arranged to have protrusion 20, in Application Example optical sheet as backlight module
Diffuser plate when, still can reduce or even avoid the generation of More (moire) interference fringe.
Furthermore according to an embodiment of the invention, its upper and lower two surface of the ontology 10 of optical sheet 1 has different roughness.
In one embodiment, the first surface 101 of ontology 10 is a smooth surface, and one opposite with first surface 101 of ontology 10
Two surfaces 102 can be a rough surface.Also that is, second surface roughness possessed by second surface 102 is greater than first surface 101
First surface roughness possessed by part other than protrusion 20.In an example, the second center line average roughness Ra
For example, 3 μm~7 μm.In an example, 10 mean roughness Rz possessed by second surface 102 are, for example, 20 μm~35 μ
m.When applied to a backlight module, can enable first surface 101 is incidence surface, and second surface 102 is light-emitting surface；Also the second table can be enabled
Face 102 is incidence surface, and first surface 101 is light-emitting surface.
In addition, optical sheet 1 is, for example, to be made by translucent material, e.g. by a translucent resin institute in embodiment
Composition, then multiple diffusion particles are added to be dispersed therein.Workable translucent resin such as polycarbonate
(polycarbonate), polystyrene (PS), polymethyl methacrylate (PMMA), Methyl Methacrylate-Styrene
(MS), acrylonitrile-styrene (AS), cyclic polyolefin (cyclo-olefincopolymer), polyolefin copolymer be (such as
Poly- 4-methyl-1-pentene), it is polyethylene terephthalate (polyethylene terephthalate), polyester, poly-
Ethylene, polypropylene, polyvinyl chloride, iolon (ionomer) etc..Wherein, and with polycarbonate, polystyrene, poly- first
Base methyl acrylate, Methyl Methacrylate-Styrene are preferred.Therefore, in an embodiment, after optical sheet completes the production, light
Multiple diffusion particles (such as transparent particle) can be further included by learning among the ontology of plate and multiple protrusions of formation is scattered in it
In to be used as light diffusing agent.
In one embodiment, workable translucent resin is the tree that bending modulus (Flexural Modulus) is greater than 1GPa
Rouge, e.g. bending modulus are greater than the resin of 2GPa, and the resin of this type can generate smaller deformation, i.e., under external force
With preferable supportive, optical sheet 1 is made to be more suitable for the application of backlight module, that is, is not required to excessively improve the thickness of optical sheet 1 just
There can be good supportive.
In one embodiment, the middle amount average molecular weight range of translucent resin is 150,000~450,000, in can make within the scope of this
Translucent resin has both good mechanicalness and processability；In another embodiment, the softening point temperature of translucent resin is controlled
(50 DEG C/hr, 1kg) can also make translucent resin have good workability in 95 DEG C~150 DEG C.
In one embodiment, methanol soluble part in translucent resin can be made, that is, be dissolvable in water oligomer in methanol, addition
The total content of the ingredients such as agent, residual monomer is in 1.5 weight % hereinafter, so, it can be ensured that the heat resistance of translucent resin.
In one embodiment, transparent diffusion particle gathers for example using silica, titanium dioxide as the inorganic fine particles of representative
The organic particle of styrene resin, (methyl) acrylic resin, silicone resin etc., and it is preferable with organic particle, e.g. singly
Using organic particle, also or it is used in mixed way organic particle and inorganic fine particles.Organic particle has again with what is built bridge
Machine particulate more preferably, at least build bridge in its manufacturing process by part, then will not generate in the process of translucent resin
Deformation, and particulate state can be maintained.Even if that is, will not also be melted in translucency to be heated to the forming temperature of translucent resin
Particulate in resin is preferable, and the organic particle of (methyl) acrylic resin, silicone resin more preferably built bridge.One implements
In example, particularly suitable transparent particle (diffusion particle) for example has, and the methyl methacrylate built bridge using part is the poly- of matrix
Close object particulate poly- (butyl acrylate) kernel/poly- (methyl methacrylate) shell polymer, have include rubber
The kernel of the polyvinyl kernel of shape and shell/shell kenel polymer (Rhom and Hass Rohm and Hass
Campany system, trade name Paraloid EXL-5136), silicone resin (the Toshiba Silicone (stock) with bridge formation siloxy group
Corporation, trade name Tospearl 120).
In one embodiment, the average grain diameter of diffusion particle is 0.01 μm~30 μm.In another embodiment, optical sheet is made an addition to
Diffusion particle in 1, average grain diameter are 0.01 μm~20 μm.In another embodiment, the diffusion grain in optical sheet 1 is made an addition to
Son, average grain diameter are 0.01 μm~15 μm.The average grain diameter of diffusion particle is with the surface of not prominent 10/ protrusion 20 of ontology
It is good.In one embodiment, inorganic fine particles and organic particle can be used with simultaneously, e.g. mixed partial size is 0.01 μm~0.05 μm
Titanium dioxide particle and partial size be 1 μm~10 μm of silicone resin.In one embodiment, the light transmittance of optical sheet 1 is 45%~
70%, preferably 50%~65%.Higher luminance performance can be possessed simultaneously when the light transmittance of optical sheet 1 is 45%~70%
And can avoid because light transmittance is too high see light source the problem of.
In addition, the weight average measured as the average grain diameter of those transparent particles of diffusion particle with particle counting
Partial size, and using the population particle size distribution analysis device MODEL Zm of section, Co., Ltd. day machine as analyzer.Weight average
The photism that partial size can be obtained sufficient light diffusing and keep Luminescent mask excellent when being 0.01 μm~30 μm, can effectively control
Additive amount processed makes light diffusing and light transmittance in preferably performance.
In addition, translucent resin of the usage amount of transparent particle based on 100 parts by weight is 0.1~20 parts by weight, and special
It is not suitably for 0.35~12.5 parts by weight.In one embodiment, e.g. addition 0.05~1 parts by weight titanium dioxide particle with
The silicone resin of 0.3~11.5 parts by weight.The usage amount of transparent particle can generate light diffusing deficiency when being less than 0.1 parts by weight,
The problem of can penetrating and seeing light source.On the other hand, light can be reduced when the usage amount of transparent particle is more than 20 parts by weight
Percent of pass, and luminance is deteriorated.
In one embodiment, optical sheet 1 can be used polystyrene (PS) (such as: Taiwan surprise beauty GPPSPG-383D, weight
Average molecular weight is about 300,000, softening point temperature be 106 DEG C) translucent resin and add transparent particle (such as: addition
The titanium dioxide particle and 0.3~11.5 parts by weight average grain diameter of 0.05~1 0.01 μm of parts by weight average grain diameter~0.055 μm
1 μm~10 μm of silicone resin), arbitrary method or device can be used that single layer production is adopted in this combination and forms substrate (i.e. light
Diffuser plate).In embodiment, the plate structure of predetermined thickness is e.g. configured to using extrusion by melting.When with melt extruded,
Preferably squeezed after the melting zone of extruder is decompressed to 1.33~66.5kPa.It is joined together if the melting zone of extruder does not depressurize
Transparent particle and especially melting property acrylate copolymer particulate not will receive the influence of oxygen, and may cause particle table
Face part crumbles and light diffusing is enable to reduce.Also, in addition to this, previous known method is also available, such as injection molding, penetrates
The forming of the optical sheet 1 of all achievable embodiment of the modes such as compression molding, blow molding, compression molding, powder forming out.
In addition, optical sheet 1 of the invention also can be multi-layer board, such as in addition to above-mentioned translucency tree in addition to lamina makes
Rouge layer may also include a coating.In one embodiment, coating with a thickness of 0.01mm~0.5mm or 0.02mm~
0.4mm or 0.03~0.3mm.If the thickness of coating is more than 0.5mm, might have because backlight module unit thickness increases
And it is unable to fully the problem of reaching the requirement of liquid crystal display device slimming.Furthermore this coating is for example with can give full play to
The high transparency of lens effect, workable resin are acrylic resin, such as polymethyl methacrylate, methacrylic acid
Methyl esters-styrene, acrylonitrile-styrene etc..Wherein, and with polymethyl methacrylate, methyl methacrylate-benzene second
Alkene is preferable.
In addition, more may include the addition of ultraviolet absorbing agent in the composition of optical sheet 1, to improve the weather-proof of optical sheet 1
Property and block harmful ultraviolet light；And/or more may include fluorescer addition, fluorescer has the ultraviolet light portion of absorbable light
Energy, and by the effect of the power radiation to visible section.
It is to form 100 parts by weight of acrylic resin of above-mentioned coating in a multiple-plate embodiment in optical sheet 1
In, containing 0.5~15 parts by weight of ultraviolet absorbing agent, and 0.01 μm~30 μm of average grain diameter of diffusion particle can be added according to need
Such as 0.001~0.1 parts by weight of 0.1~20 parts by weight of transparent particle and fluorescer.
In one embodiment, ultraviolet absorbing agent for example: the benzophenone of 2,2 '-dihydroxy -4- methoxy benzophenones
The three of class ultraviolet absorbing agent, 2- (4,6- diphenyl -1,3,5-triazines -2- substituent group) -5- hexyl hydroxyl phenol
Piperazine class ultraviolet absorbing agent, 2- (2H- benzotriazole -2- substituent group) -4- methylphenol, 2- (2H- benzotriazole -
2- substituent group) -4- third octyl phenol, 2- (2H- benzotriazole -2- substituent group) bis- (1- methyl-of -4,6-
1- phenethyl) phenol, 2- (2H- benzotriazole -2- substituent group) -4,6- be bis--third amyl phenol, 2- (5- chlorine
Base -2H- benzotriazole -2- substituent group) -4- methyl -6- third butylphenol, 2- (5- chloro -2H- benzo
Triazole -2- substituent group) -2,4- third butylphenol and 2, ((2H- benzotriazole -2- replaces 6- 2 '-di-2-ethylhexylphosphine oxides
Base) -4- (1,1,3,3- tetramethyl butyl) phenol) etc. Benzotriazole Ultraviolet Stabilizer.
In one embodiment, preferable ultraviolet absorbing agent for example: 2- (2- hydroxy-5-methyl phenyl) benzotriazole, 2-
(the pungent phenyl of 2- hydroxyl -5- third) benzotriazole, 2- (2- hydroxyl -3,5- diisopropylbenzene (DIPB)) phenyl benzotriazole, 2-
(2- hydroxyl -3- third butyl -5- tolyl) -5- chloro benzotriazole, 2,2 '-di-2-ethylhexylphosphine oxide (4- (1,1,3,3
Tetramethyl butyl) -6- (2H- benzotriazole -2- substituent group) phenol), ((3,4,5,6- tetrahydros are adjacent by 2- hydroxyl -3- by 2-
Benzene imidodicarbonic diamide methyl) -5- tolyl) benzotriazole.Wherein, with 2- (the pungent phenyl of 2- hydroxyl -5- third) benzo three
Azoles (Ciba-Geigy corporation, trade name Tinuvin 329), 2,2 '-di-2-ethylhexylphosphine oxides (4- (1,1,3,3- tetramethyl fourth
Base) -6- (2H- benzotriazole -2- substituent group) phenol) it is preferred.
Furthermore when using ultraviolet absorbing agent in embodiment, can individually select a kind of ingredient or merge using 2 kinds of ingredients with
On, and relative to 100 parts by weight of acrylic resin to use 0.5~15 parts by weight to be preferred, and more preferably with 1~10 parts by weight.
When usage amount is less than 0.5 parts by weight, then weatherability is bad and make form and aspect variation greatly, when usage amount is greater than 15 parts by weight,
Then tone and luminance are all deteriorated.
In addition, fluorescer used in embodiment (has the ultraviolet light portion energy of absorbable light, and the energy is put
Be incident upon the actor of visible section) in the range of not undermining light resistance, improving the tone of synthetic resin etc. at white or
Blue and white person, such as diphenylethylene, benzimidazole, benzoxazoles class, phthalimide class, rose-red class, cumarin
Class, evil azole compounds etc..In one embodiment, the usage amount of fluorescer is, for example, relative to 100 parts by weight of acrylic resin
0.001~0.1 parts by weight range, and it is preferable with the range of 0.002~0.08 parts by weight.Cooperate by aforementioned range
Fluorescer can make light-emitting surface obtain the effect of sufficient photism and tone improvement.
Although and above-mentioned cooperation Fig. 1 and Fig. 2A to the present invention wherein an embodiment be described further, the present invention is not
As limitation.Fig. 9 is the partial schematic diagram of an optical sheet of another embodiment of the present invention.Figure 10 is along a section in Fig. 9
The diagrammatic cross-section for another protrusion that line 10-10 is painted.Fig. 9~Figure 10 and the same or similar element edge FIG. 1 to FIG. 2 A
With same or similar label, with sharp clear explanation.As shown in figure 9, optical sheet 1 ' equally includes an ontology 10 and multiple protrusions
Portion 30 is located on the first surface 101 of ontology 10 and protrudes from first surface 101.The spacing of protrusion 30 in this embodiment
Dp, maximum height Hp and the related descriptions such as inclined angle alpha and the roughness of first surface 101 and second surface 102, please refer to
Foregoing teachings, this will not be repeated here.The protrusion 30 of this embodiment and aforementioned 20 difference of protrusion such as FIG. 1 to FIG. 2 A be, one
Protrusion 30 includes that a convex block 30B and an annulus (bottomring) 30R, annulus 30R are located at below convex block 30B.Such as figure
9, shown in Figure 10, annulus 30R surrounds and connects convex block 30B, and forms an outer rim 301 outstanding in first surface 101.Yu Yi
In actual fabrication, annulus 30R and convex block 30B are all integrally formed with ontology 10.Whether the protrusion as shown in FIG. 1 to FIG. 2 A
Portion 20 or whether such as Fig. 9~protrusion shown in Fig. 10 30 can all make the light emitting region of display device maintain high luminance and can
Reach and improves the advantages of luminance is spent together.
<related experiment>
Several groups of related experiments and its data are listed below to make the explanation of embodiment.The structure of optical sheet 1 please refers to
Above content and Fig. 1~Figure 10.In an experiment, several groups of samples are proposed, and the specification of each sample is as follows:
Comparative example 1-commercially available single side texture diffuser plate DS551A (odd U.S. industry), the center line average roughness on surface
Spending Ra is 3~7 μm, with a thickness of 1.5mm.
There are a kind of comparative example 2-diffuser plate multiple irregular islands to protrude from the surface of material main body, these are not advised
Then the longest berm width range of island top surface is 0.388~2.315mm, is highly 23.02 μm, adjacent irregular island
The distance between object is 21~433 μm, with a thickness of 1.5mm.
Experimental example 1~3-optical sheet as described in above-mentioned Fig. 1, Fig. 2A.Relevant parameter is listed in table 1.
Luminance, the equal Qi Du in quadrangle:
Using Japan open up general Kanggong department (TOPCON CORPORATION) manufactured by the brightness photometer of model BM-7A survey
It is fixed, and the light diffusing sheet of experimental example 1~3 and comparative example 1~2 is set to the lamp being arranged with LED lamp source array when measurement
Luminance measurement is carried out on tank module.Wherein, luminance (luminance) value is numerical value after standardization, i.e., by comparative example 1~2 and in fact
The center luminance measuring value of example 1~3, which is tested, with standard items (Existing commercial diffuser plate DS601A (odd U.S. industry)) luminance measuring value is
100% be standardized after numerical value.Quadrangle together degree be with the luminance of module quadrangle divided by module center luminance rear four
The average value of a numerical value.
Roughness:
Surface roughness is carried out using the surface roughness testing machine instrument (model SJ-210) of three rich (Mitutoyo) companies
It measures.The Ra and Rz of random the first surface roughness Ra measured other than protrusion and Rz and second surface, measuring distance is
5mm。
The outer diameter of protrusion, height, inclination angle, spacing:
By use the laser confocal instrument (model VK-X100Series) of Ji Ensi (KEYENCE) company as measurement
Instrument, grab sample measure.
The above measurement is embedded in together in table 1.But the numerical value of table 1 is only used as example, the embodiment of the present invention model
It encloses and is not limited with this table columns value.
Table 1
As can be seen from the data in table 1, experimental example 1~3 because optical sheet have protrusion in first surface proportion range
The first center line average roughness Ra for 0.03%~35% and part system of the first surface other than protrusion is 0.01 μm
The features such as~0.1 μm, average quadrangle are spent all good compared with comparative example 1~2 together, i.e., can make in the protrusion design of experimental example 1~3
Optical sheet has preferably neat degree performance.
In addition, as can be seen from the data in table 1, the optical sheet of experimental example 1~3 is because having protrusion in first surface proportion
Range is 0.03%~35% and the first center line average roughness Ra of part system of the first surface other than protrusion is
0.01 μm~0.1 μm etc. features, the numerical value of 60 degree of angle gloss are all good compared with comparative example 1~2, i.e., the protrusion in experimental example 1~3
The reflectivity of oblique light can be improved in design, and then optical sheet is made to have preferably neat degree performance.
Figure 11 A is please referred to, a kind of schematic diagram of backlight module of the optical sheet using one embodiment of the invention is painted.This reality
The backlight module 400 for applying example is, for example, the direct type backlight module for being suitable for panel display module comprising a diffuser plate 410,
At least a light source 420 (Figure 11 A is painted multiple light sources) and a frame 440.Frame define an accommodating space 442, diffuser plate 410 and
Light source 420 is located in accommodating space 442, and diffuser plate 410 is placed in the top of light source 420.Diffuser plate 410, e.g. above-mentioned implementation
Any optical sheet in example including the ontology 10 with a first surface 101 and is located on first surface 101 and prominent
In multiple protrusions 20 of first surface 101.In Figure 11 A, light source 420 is opposite with the first surface 101 of diffuser plate 410 to be set
It sets.At this point, because the center line average roughness Ra of the first surface 101 of diffuser plate 410 is 0.01 μm~0.1 μm, and its 60 degree
Angle gloss is greater than 90, therefore, can effectively will be from light source 420 high angle incident (oblique incidence) to 410 first table of diffuser plate
The light in face 101 is transmitted through the mode of reflection toward four corners direction of diffuser plate 410, i.e., it is equal to have high quadrangle for diffuser plate 410
Qi Du, therefore backlight module can be made to have the high equal Qi Du of luminance.In one application examples, light source 420 is for example including substrate 422 and shines single
Member 424, luminescence unit 424 are, for example, the hair of light-emitting diode (light emitting diode, LED) element or other types
It optical element and is configured on substrate 422.The light that luminescence unit 424 issues enters after diffuser plate 410 through by the of diffuser plate 410
Two surfaces 102 go out light, use to form the area source that high luminance is spent together.
Figure 11 B is painted the schematic diagram of another backlight module of the optical sheet using one embodiment of the invention.Figure 11 B and figure
Unlike 11A, the main body 10 of the optical sheet in Figure 11 B, rougher surface (e.g. second surface 102) is, for example, to sting
Flower also falls within one of application of the invention facing towards the light source 420 of backlight module.In this embodiment, colloid can be penetrated again
Layer attaches other optical film layers or optical sheet in the optical appearance for improving backlight module entirety on protrusion.
In one embodiment, colloid layer is, for example, to use acrylic acid, polyurethane, the impact adhesives such as rubber or siloxanes.Figure
12A is painted the schematic diagram being bonded using the optical sheet of one embodiment of the invention with an optical film.Figure 12 B is to cut open along the one of Figure 12 A
The diagrammatic cross-section of optical sheet and optical film that upper thread 12B-12B is drawn.Referring to Figure 12 A, 12B.
In an example, the optical sheet 1 of embodiment is bonded with an optical film OP with colloid layer 71, and wherein optical film OP
It is set to the top of the first surface 101 of ontology 10 in this way, colloid layer 71 is set between optical sheet 1 and optical film OP, and glue
Body layer 71 binds the top surface of the protrusion 20 of optical sheet 1.As shown in Figure 12 B, colloid layer 71 has a thickness Lad, optical film OP arrives
There is a distance L between first surface 101gap, the top surface of the protrusion 20 of optical sheet 1 sinks into colloid layer 71 and supports light
Film OP is learned, that is, colloid layer 71 does not attach directly and contacts first surface 101, therefore in the first surface of ontology 10 101 and glue
An air layer 80 is formed between body layer 71.In one example, the thickness L of colloid layer 71adE.g. 3~7 μm, the bottom optical film OP
To the distance between first surface 101 LgapE.g. 10~42 μm.Furthermore the air layer 80 of embodiment is formed uniformly in light
It learns between plate 1 and colloid layer 71, that is, in the lower section of full wafer optical film OP, the first surface 101 of ontology 10 arrives 71 bottom of colloid layer
About the same height is maintained between face.It is empty compared with colloid layer 71 directly attaches and contacts the optical texture of first surface 101
The presence of gas-bearing formation 80, which can make to be emitted, generates the refraction of larger angle in the light of first surface, thus reinforces optics diffusion effect
(light diffusion effect)。
In one embodiment, considers colloid layer thickness and possess the existing design of air layer, the maximum height Hp of protrusion 20
Range should be between 10 μm~35 μ ms, e.g. between 12 μm~30 μ ms, or in 15 μm~27 μ ms
Between, it so can ensure that air layer is formed uniformly between optical sheet 1 and colloid layer 71.
In one embodiment, when spacing of the outer diameter Dm range between 200 μm~500 μm and two adjacent protrusions of protrusion
When within the scope of 0.5mm~10mm, good support effect effectively can be provided to the optical film OP attached, first can be made
Surface 101 is to being to maintain about the same height between 71 bottom surface of colloid layer.In another implementation, when protrusion is in first surface
Proportion is 0.03%~35%, and the first center line average roughness Ra of part of the first surface other than protrusion is
At 0.01 μm~0.1 μm, it can have both and provide the good diffusion table that good support effect is spent together with high quadrangle to optical film OP
It is existing.
In one embodiment, in the rostrum configurations with protrusion vertex P, e.g. the protrusion 20 of Fig. 2 B, Fig. 3 A~
The protrusion of 4C or the protrusion of Fig. 6 A~6C and Fig. 6 F~6H, protrusion vertex P can sink into throw in colloid layer 71 to generate
Anchor effect, and then increase the adhesion of colloid layer 71 and protrusion.
In one embodiment, as indicated in fig. 12 c, the protrusion with recessed portion 20R, e.g. 6A~6C schemes or 6F
The protrusion (schematic diagram that Figure 12 C is painted tool 6B figure protrusion) of~6H figure, can be by the recessed depth of adjustment recessed portion 20R
HDThe size of (being illustrated in Fig. 6 B) increases the ratio of air layer, even if recessed depth HDWith maximum height Hp (being illustrated in Fig. 6 B)
Proportional region be 15%~100%, e.g. 30%~100% or 50%~90%.When recessed depth HDWith maximum height
The ratio of degree Hp is fallen into 15%~100% range, and after being bonded with optical film OP with colloid layer 71, recessed portion still retains part
The space of colloid layer 71 is not fallen into, can increase the ratio of integrated air layer whereby, and it is whole to be promoted to reinforce optics diffusion effect again
Bulk optics performance.
Furthermore it includes one or more diffusion barrier and one or more prism layers (prism that applicable optical film OP, which is, for example,
Sheets) multilayer opticals membrane material or the multi-layer optical films such as microlens film (microlens film) and one or more prism layers such as
Material, to adjust light-emitting angle (such as concentrating light).Although including a diffusion barrier 73 and one in Figure 12 A~12C with optical film OP
It is explained for prism layer 74, but the present invention is not specially limited applicable related optical diaphragm and/or prism structure, the number of plies
Or aspect.
Furthermore in an embodiment, backlight module 400 can be used as the backlight module of a display device, e.g.
TV, notebook personal computer, removable computer, for monitor of computer etc. etc. or can directly by backlight module 400 as shine
Bright use, e.g. lamp box for display, billboard.
In conclusion the optical sheet that embodiment proposes, there is the protrusion such as above-mentioned special designing to be formed in body surfaces
On.When the optical sheet (as shown in Fig. 1, Fig. 9) of Application Example is used as diffuser plate, luminance more can be improved compared to existing diffuser plate
Equal Qi Du.Therefore, the optical sheet of Application Example can not only promote the display effect of image as diffuser plate, avoid More
(moire) situation occurs for interference fringe, can also reduce the quantity that other functional films use, and reduces manufacturing cost, and make
The display device of application integrally becomes more frivolous, has high application value especially for big size display device.Separately
Outside, the optical sheet of Application Example as diffuser plate and when its protrusion is bonded with an optical film by colloid, may be used also by protrusion
It supports optical film to form an air layer between the surface and colloid layer of optical sheet ontology, can more reinforce whole optics diffusion
Effect.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (11)
1. a kind of optical sheet characterized by comprising
One ontology has a first surface；And
Multiple protrusions on the first surface and protrude from the first surface, and the protrusion is in the ontology
The proportion of the first surface is 0.03%~35%, and having a spacing between the two adjacent protrusions is 0.5mm
~10mm, and it is 0.01 that part of the first surface other than the protrusion, which has one first center line average roughness Ra,
μm~0.1 μm.
2. optical sheet according to claim 1, which is characterized in that the one of them of the protrusion have an outer diameter be
200 μm~500 μm.
3. optical sheet according to claim 1, which is characterized in that the protrusion includes that a recessed portion is formed in described dash forward
Between at least two vertex in the portion of rising.
4. optical sheet according to claim 1 is made of translucent resin, which is characterized in that the translucent resin
Bending modulus is greater than 1GPa.
5. optical sheet according to claim 1, which is characterized in that one of described protrusion includes:
One convex block；With
One annulus, is located at the underbump, and the annulus surrounds and connects the convex block.
6. a kind of optical texture characterized by comprising
Optical sheet as described in any one of Claims 1 to 5 item；
One optical film is set to the top of the first surface of the ontology；And
Colloid layer is set between the optical sheet and the optical film, and the colloid layer binds the top surface of the protrusion,
And there is an air layer between the first surface and the colloid layer.
7. a kind of optical texture characterized by comprising
One optical sheet, comprising:
One ontology has a first surface；And
Multiple protrusions protrude from the first surface, and it is 200 μm~500 μ that the one of them of the protrusion, which has an outer diameter,
M and a maximum height are 10 μm~35 μm, and having a spacing between the two adjacent protrusions is 0.5mm~10mm；
One optical film is set to the top of the first surface of the ontology；And
Colloid layer is set between the optical sheet and the optical film, and the colloid layer binds the top surface of the protrusion,
And there is an air layer between the first surface and the colloid layer.
8. optical texture according to claim 7, which is characterized in that the protrusion includes a recessed portion, the recess
There is an air layer between one bottom and the colloid layer in portion.
9. a kind of backlight module characterized by comprising
One light source；And
As described in any one of optical sheet as described in any one of Claims 1 to 5 item or claim the 6th~8
Optical texture, setting corresponding with the light source.
10. backlight module according to claim 9, it is characterised in that the light source is corresponding with the first surface to be set
It sets.
11. a kind of display device characterized by comprising
Backlight module as claimed in claim 9, wherein the display device is selected from by TV, notebook personal computer, shifting
Dynamic computer and group composed by the monitor for computer.
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| TW107113623 | 2018-04-20 | ||
| TW107113623 | 2018-04-20 |
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|---|---|---|---|---|
| CN111796348A (en) * | 2020-07-02 | 2020-10-20 | Tcl华星光电技术有限公司 | Visual angle diffusion film and display panel |
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| WO2023108875A1 (en) * | 2021-12-14 | 2023-06-22 | 瑞仪光电(苏州)有限公司 | Light guide plate, backlight module and display device |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI702443B (en) | 2020-08-21 |
| TW201944136A (en) | 2019-11-16 |
| CN110389475B (en) | 2022-04-05 |
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