CN102155711A - Optical sheet - Google Patents
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- CN102155711A CN102155711A CN2010101158531A CN201010115853A CN102155711A CN 102155711 A CN102155711 A CN 102155711A CN 2010101158531 A CN2010101158531 A CN 2010101158531A CN 201010115853 A CN201010115853 A CN 201010115853A CN 102155711 A CN102155711 A CN 102155711A
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Abstract
The invention relates to an optical sheet which comprises a light transmitting substrate and a plurality of raised structures. The light transmitting substrate is provided with a first surface and second surface which are opposite. The raised structures are arranged on the first surface, wherein each raised structure is provided with a first bending convex surface and a second bending convex surface which are opposite; the first bending convex surface is provided with a first curvature center; the second bending convex surface is provided with a second curvature center; and the first curvature center and the second curvature center are respectively arranged at two opposite sides of the raised structure.
Description
Technical field
The present invention relates to a kind of optical element (optical element), and be particularly related to a kind of optical sheet (optical sheet) of tool screening effect.
Background technology
Because liquid crystal panel itself can be not luminous, therefore can adopt backlight to throw light on, the function of liquid crystal panel itself then is to determine the light percent of pass of each pixel, so just can form display frame.In the available liquid crystal display unit, be to adopt backlight module to form backlight.The formed backlight of backlight module has decisive influence to the image quality that liquid crystal indicator produced.Even more when backlight, image quality is good more, and it is strong more to work as backlight intensity, and picture brightness is high more.
Diffuser plate is suitable in the backlight module, to promote the luminous intensity of backlight.The existing diffuser plate diffusion particulates of being located at diffuser plate inside that adopt produce the light scattering effect more.Yet the diffusion particulate is except with the light scattering, light that also can absorption portion, and then cause optical efficiency to reduce.In addition, because the diffusion particulate can also can't make light obtain good utilization the past incoherent scattering from all directions of light.The low optical efficiency of existing diffuser plate can cause the brightness of the backlight that backlight module provides to reduce, and then the brightness of the picture that liquid crystal display picture provides is reduced.
Fig. 5 and Fig. 8 that the Taiwan patent is M358309 number disclose a kind of blooming, comprise transmitting substrate, a plurality of first light out part, a plurality of second light out part, a plurality of the 3rd light out part and a plurality of the 4th light out part.Light is injected blooming by the incidence surface of transmitting substrate, and penetrates blooming by first light out part that attaches transmitting substrate one side, second light out part and the 3rd light out part.
In addition, Fig. 9 of Taiwan patent M313258 number is constituted by different alternately arrangement of height with the micro-structural that Figure 11 discloses on the blooming piece.Fig. 9 that the Taiwan patent is M314349 number has disclosed the micro-structural on the blooming piece and has been constituted by different alternately arrangement of height, and wherein the drift angle of micro-structural can be circular-arc.Fig. 3 that the Taiwan patent is M357621 number is provided with the just micro-structural of different arrangements with the first surface that Fig. 4 has disclosed the base material of blooming piece, and wherein the drift angle of this micro-structural can be circular-arc.Fig. 5 that No. the 5771328th, United States Patent (USP) has disclosed blooming piece and has been provided with the different micro-structurals of arranging of height.United States Patent (USP) has disclosed diffuser plate for No. 7213933 and has had a plurality of circular arc micro-structurals.Taiwan patent M247768 has disclosed a kind of diffuser plate, has a plurality of refraction part, and wherein refraction part can be trapezoidal, circular arc or prismatic shape micro-structural.
Summary of the invention
The invention provides a kind of optical sheet, have preferable light transmittance and covering property, with the formation area source that brightness is higher and the uniformity is preferable, and this optical sheet has lower cost.
Other purpose of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.
For reaching one of above-mentioned or partly or entirely purpose or other purpose, one embodiment of the invention propose a kind of optical sheet, comprise transparent substrates and a plurality of bulge-structure.Transparent substrates has opposite first and second surface.These bulge-structures are disposed on the first surface, and wherein each bulge-structure has the first relative crooked convex surface and the second crooked convex surface.The first crooked convex surface has the first curvature center, and the second crooked convex surface has the torsion center, and wherein first curvature center and torsion center lay respectively at the relative both sides of bulge-structure.When being the center of circle with the first curvature center and being radius and when on perpendicular to first surface and reference planes, making first circle of reference by first curvature center and torsion center with the radius of curvature of the first crooked convex surface, and when being the center of circle with the torsion center and being radius and when on these reference planes, making second circle of reference with the radius of curvature of the second crooked convex surface, the intersection point of first circle of reference and second circle of reference to the line at first curvature center is spent more than or equal to 25 with respect to the inclination angle of the line of centres at first curvature center and torsion center, and smaller or equal to 55 degree.In addition, this intersection point to the line at torsion center is spent more than or equal to 25 with respect to the inclination angle of this line of centres, and smaller or equal to 55 degree.
Another embodiment of the present invention proposes a kind of optical sheet, comprises transparent substrates and a plurality of bulge-structure.Transparent substrates has opposite first and second surface.These bulge-structures are disposed on the first surface, and wherein each bulge-structure has the first relative crooked convex surface and the second crooked convex surface.The first crooked convex surface has the first curvature center, and the second crooked convex surface has the torsion center, and wherein first curvature center and torsion center lay respectively at the relative both sides of bulge-structure.These of all these bulge-structures first crooked convex surface has identical haply each other radius of curvature, and these second crooked convex surfaces of all these bulge-structures have identical haply each other radius of curvature.
The embodiment of the invention can have the one at least of following advantage or effect.In embodiment of the invention optical sheet, the curvature of the first crooked convex surface and the second crooked convex surface and position meet the shape of first circle of reference and second circle of reference, the intersection point of first circle of reference and second circle of reference to the line at first curvature center is spent more than or equal to 25 with respect to the inclination angle of the line of centres at first curvature center and torsion center, and smaller or equal to 55 degree, and intersection point to the line at torsion center is spent more than or equal to 25 with respect to the inclination angle of this line of centres, and smaller or equal to 55 degree, so screening effect and briliancy be can promote simultaneously, and then the uniformity and the brightness of the area source that backlight module provided that adopts this optical sheet promoted.In the optical sheet of the embodiment of the invention, because these first crooked convex surfaces of all these bulge-structures have identical haply each other radius of curvature, and these of all these bulge-structures second crooked convex surface has identical haply each other radius of curvature, so this optical sheet can form comparatively uniform surface light source.
For the above-mentioned feature and advantage of the present invention can be become apparent, embodiment cited below particularly, and cooperate appended graphic being described in detail below.
Description of drawings
Figure 1A is the stereogram of the optical sheet of one embodiment of the invention.
Figure 1B is the profile of the optical sheet of Figure 1A along the I-I line.
Fig. 1 C is the profile of the bulge-structure among Figure 1B.
Fig. 2 A and Fig. 2 B illustrate two kinds of modification in addition of the optical sheet of Figure 1B.
Fig. 3 is applied to the part sectioned view of backlight module for the optical sheet of Figure 1A.
Fig. 4 is the profile of the optical sheet of another embodiment of the present invention.
Fig. 5 A is the briliancy distribution map that the optical sheet of the diffuser plate of diffuser plate, tool lens pillar of tool prism and Fig. 4 is produced when being applied to backlight module.
The optical sheet that Fig. 5 B illustrates the diffuser plate of diffuser plate, tool lens pillar of tool prism and Fig. 4 is arranged in pairs or groups other blooming piece respectively and the briliancy distribution map that produced when being applied to backlight module again.
Fig. 6 illustrates other application mode of the optical sheet of Fig. 4.
Fig. 7 A is the profile of the optical sheet of further embodiment of this invention.
Fig. 7 B is the profile of the bulge-structure group among Fig. 7 A.
Fig. 8 is the profile of the bulge-structure in the optical sheet of yet another embodiment of the invention.
[main element symbol description]
100,100c, 100d: optical sheet
110: transparent substrates
112: first surface
114: second surface
120,120c, 120d, 120e: bulge-structure
122,122e: the first crooked convex surface
124,124e: the second crooked convex surface
130: bulge-structure group
200,200a: backlight module
210: light-emitting component
212,212a, 212b: light beam
220: reflecting element
230: diffusion barrier
240: brightness enhancement film
A: symmetrical plane
C1: first curvature center
C1C2: line of centres
C2: torsion center
D1: first direction
D2: second direction
H: vertical range
H ': vertical height
L: length
P: distance
R1, R1 ', R2, R2 ', R3: radius of curvature
T, T ': top
U1: first circle of reference
U2: during second circle of reference
X: intersection point
XC1, XC2: line
Δ H: difference in height, vertical height
θ 1, θ 2: inclination angle
The specific embodiment
Aforementioned and other technology contents, characteristics and effect about the present invention in the DETAILED DESCRIPTION OF THE PREFERRED of following conjunction with figs., can clearly present.The direction term of being mentioned in following examples, for example: upper and lower, left and right, front or rear etc. only are directions with reference to the accompanying drawings.Therefore, the direction term of use is to be used for illustrating not to be to be used for limiting the present invention.
Figure 1A is the stereogram of the optical sheet of one embodiment of the invention, and Figure 1B is the profile of the optical sheet of Figure 1A along the I-I line, and Fig. 1 C is the profile of Figure 1B relief structure.With reference to Figure 1A to Fig. 1 C, present embodiment optical sheet 100 comprises transparent substrates 110 and a plurality of bulge-structure 120.Transparent substrates 110 has opposite first 112 and second surface 114.These bulge-structures 120 are disposed on the first surface 112, and wherein each bulge-structure 120 has the first relative crooked convex surface 122 and the second crooked convex surface 124.The first crooked convex surface 122 has first curvature center C 1 (shown in Fig. 1 C), and the second crooked convex surface 124 has torsion center C 2, and wherein first curvature center C 1 and torsion center C 2 lay respectively at the relative both sides of bulge-structure 120.In the present embodiment, when being the center of circle with first curvature center C 1 and being radius and when on perpendicular to first surface 112 and reference planes (being the drawing of Fig. 1 C), making the first circle of reference U1 with the radius of curvature R 1 of the first crooked convex surface 122 by first curvature center C 1 and torsion center C 1, and when with torsion center C 2 being the center of circle and when being radius and the second circle of reference U2 that on these reference planes, makes with the radius of curvature R 2 of the second crooked convex surface 124, the intersection point X of the first circle of reference U1 and the second circle of reference U2 to the line XC1 of first curvature center C 1 with respect to the tiltangle 1 of first curvature center C 1 and the line of centres C1C2 of torsion center C 2 more than or equal to 25 degree, and smaller or equal to 55 degree.In addition, this intersection point X to the line XC2 of torsion center C 2 with respect to the tiltangle 2 of line of centres C1C2 more than or equal to 25 degree, and smaller or equal to 55 degree.In the present embodiment, the radius of curvature R 1 of the first crooked convex surface 122 equals the radius of curvature R 2 of the second crooked convex surface 124 haply.
In the present embodiment, each bulge-structure 120 is the strip projected parts structure, and each bulge-structure 120 extends along first direction D1, and these bulge-structures 120 are arranged along second direction D2.In addition, line of centres C1C2 is haply perpendicular to this first direction D1, and the first crooked convex surface 122 is the face of cylinder of extending along first direction D1, and the second crooked convex surface 124 is the face of cylinder of extending along first direction D1.Moreover in the present embodiment, first direction D1 is haply perpendicular to second direction D2.
In the present embodiment, these bulge-structures 120 meet L/2≤P≤2L, wherein L is the length of the overlapping part of radius R 2 on the line of centres C1C2 of first curvature center C 1 and torsion center C 2 of the radius R 1 of the first circle of reference U1 and the second circle of reference U2, and P is the distance of top T on the direction parallel with first surface 112 of adjacent two bulge-structures 120.In Figure 1B and Fig. 1 C being is example with P=L.Yet, in another embodiment, shown in Fig. 2 A, the P=2L of optical sheet 100a.In addition, in another embodiment, shown in Fig. 2 B, L/2＜P of optical sheet 100b＜L.
Moreover, in the present embodiment, each bulge-structure 120 meets H/2≤H '≤H, wherein H ' is the vertical height of the top T of bulge-structure 120 to first surface 112, and H be the intersection point X of the first circle of reference U1 and the second circle of reference U2 to first curvature center C 1 vertical range with the line of centres C1C2 of torsion center C 2, and be to be example in Fig. 1 C with H=H '.
Fig. 3 is applied to the part sectioned view of backlight module for the optical sheet of Figure 1A.With reference to Figure 1A to Fig. 1 C and Fig. 3, in the present embodiment, backlight module 200 comprises a plurality of light-emitting components 210, reflecting element 220 and optical sheet 100.In the present embodiment, light-emitting component 210 for example is that (cold cathode fluorescent lamp, CCFL), and light-emitting component 210 is suitable for sending light beam 212 to cathode fluorescent tube, and reflecting element 220 is suitable for light beam 212 is reflexed to optical sheet 100.Yet, in other embodiments, light-emitting component 210 can also be light emitting diode (light emitting diode, LED) or other suitable light-emitting component.When light beam 212 (for example light beam 212a) comparatively vertically during beam incident optical sheet 100, the second crooked convex surface 124 and the first crooked convex surface 122 are suitable for light beam 212 (as light beam 212a) is produced the total reflection effect, and make light beam 212a be reflected back toward reflecting element 220.At this moment, bulge-structure 120 has been brought into play the effect that is similar to prism columns, so just can make the brightness that is positioned at the light beam 212 directly over the light-emitting component 210 be unlikely to bright, and reach the effect of covering light-emitting component 210.And reflecting element 220 is understood light beam 212a reflected back optics sheet 100, and light beam 212a can be utilized once more.
On the other hand, when light beam 212 (for example light beam 212b) comparatively obliquely during beam incident optical sheet 100, light beam 212b is suitable for by the first crooked convex surface 122 or second crooked convex surface 124 refractions, and penetrates optical sheet 100.At this moment, bulge-structure 120 has been brought into play the function that is similar to lens, and with the direction of transfer correcting of the light beam 212b of oblique incidence, so can promote adjacent two light-emitting components 210 the interval directly over the brightness of light beam 212.In addition, if above-mentioned element 220 beam reflected 212a that are reflected once more comparatively vertically during beam incident optical sheet 100, can be once more by bulge-structure 120 total reflections, and get back to reflecting element 220.The function of reflecting element 220 just is constantly will be by the light beam 212 reflected back optics sheets 100 of total reflection, up to incident bulge-structure 120 that light beam 212 comparatively tilts and till penetrating optical sheet 100.
Brought into play the function of similar prism columns and similar lens respectively by the light beam 212 of 120 pairs of different angles incidents of bulge-structure, light beam 212 just can form the area source that brightness is higher and the uniformity is preferable after by optical sheet 100.Thus, just can not have diffusion particle in the optical sheet 100, make the area source effect of uniform and still can reach.In addition, owing to do not have the diffusion particle of meeting absorption portion light, the light transmittance of optical sheet 100 is higher, and optical efficiency is preferable.
In the present embodiment, because line XC1 spends more than or equal to 25 with respect to the tiltangle 1 of line of centres C1C2, and smaller or equal to 55 degree, and line XC2 spends more than or equal to 25 with respect to the tiltangle 2 of line of centres C1C2, and smaller or equal to 55 degree, so optical sheet 100 can reach preferable screening effect and brightness lifting effect.
In addition, in order further to promote the uniformity of area source, in the present embodiment, can make the first crooked convex surface 122 of all bulge-structures 120 have identical haply each other radius of curvature R 1, and can make the second crooked convex surface 124 of all bulge-structures 120 have identical haply each other radius of curvature R 2.In addition, in the present embodiment, the radius of curvature R 1 of the first crooked convex surface 122 equals the radius of curvature R 2 of the second crooked convex surface 124 haply.
Fig. 4 is the profile of the optical sheet of another embodiment of the present invention.With reference to Fig. 4, the optical sheet 100c of present embodiment and the optical sheet 100 of Figure 1B are similar, and both difference is as described below.In the optical sheet 100c of present embodiment, the top T of each bulge-structure 120c ' form rounding, and the radius of curvature R 3 of this rounding is more than or equal to 5 microns, and smaller or equal to 10 microns.Rounding helps to increase the uniformity of light beam 212 (illustrating as Fig. 3), and makes and can dispose other less blooming piece above the optical sheet 100c, so also can reduce cost and light loss consumes.
Fig. 5 A is the briliancy distribution map that the optical sheet of the diffuser plate of diffuser plate, tool lens pillar of tool prism and Fig. 4 is produced when being applied to backlight module.With reference to Fig. 4 and Fig. 5 A, the backlight module 200 that is applied to Fig. 3 when the diffuser plate of the diffuser plate of present embodiment optical sheet 100c, tool prism and tool lens pillar is when replacing the optical sheet 100 among Fig. 3, and the briliancy of (being the top of Fig. 3) distributes shown in Fig. 5 A above backlight module 200.Can find out obviously that by Fig. 5 A briliancy that the optical sheet 100c of present embodiment can reach distributes obviously even than the diffuser plate of the diffuser plate of tool prism and tool lens pillar, can verify that so the optical sheet 100c of present embodiment can reach the preferable uniformity really.
The optical sheet that Fig. 5 B illustrates the diffuser plate of diffuser plate, tool lens pillar of tool prism and Fig. 4 is arranged in pairs or groups other blooming piece respectively and the briliancy distribution map that produced when being applied to backlight module again, and Fig. 6 illustrates other application mode of the optical sheet of Fig. 4.With reference to Fig. 5 B and Fig. 6, the optical sheet 100c of Fig. 4 also can be applicable to the backlight module 200a of Fig. 6.The backlight module 200a of present embodiment also comprise diffusion barrier 230 and brightness enhancement film (brightness enhancement film, BEF) 240, wherein diffusion barrier 230 places optical sheet 100c top, and brightness enhancement film 240 places diffusion barrier 230 tops.By Fig. 5 B as can be known, the briliancy uniformity that present embodiment adopts the collocation of optical sheet 100c, diffusion barrier 230 and brightness enhancement film 240 to reach, more preferable than the briliancy uniformity that the collocation of diffuser plate, lenticule film and the brightness enhancement film of tool prism can be reached, and the briliancy uniformity that can reach than the collocation of diffuser plate, lenticule film and the brightness enhancement film of tool lens pillar is preferable.In addition, two kinds of collocation compared to the back, present embodiment adopts the collocation of optical sheet 100c, diffusion barrier 230 and brightness enhancement film 240 can use the higher lenticule film of cost, therefore can have lower cost.
Fig. 7 A is the profile of the optical sheet of further embodiment of this invention, and Fig. 7 B is the profile of Fig. 7 A relief structure group.With reference to Fig. 7 A and Fig. 7 B, present embodiment optical sheet 100d is similar to the optical sheet 100 of Figure 1B, and both difference is as described below.In the optical sheet 100d of present embodiment, every N adjacent protrusion structure 120d forms bulge-structure group 130, and wherein N is more than or equal to 3, and N is smaller or equal to 9, and is that to equal 5 with N be example in Fig. 7 A.These bulge-structures 120d in each bulge-structure group 130 is the mirror image balanced configuration, for example is the symmetrical plane A symmetry with respect to Fig. 7 B.In addition, the height of these bulge-structures 120d in each bulge-structure group 130 is incomplete same.
In the present embodiment, bulge-structure group 130 meets L/4≤P≤L, wherein P is the distance of top T on the direction parallel with first surface of adjacent two bulge-structure 120d in the bulge-structure group 130, and L is the length of the radius R 1 of the first circle of reference U1 and the overlapping part of the radius R 2 of the second circle of reference U2 (with reference to figure 1C) on the line of centres C1C2 of first curvature center C 1 and torsion center C 2.
In the present embodiment, bulge-structure group 130 meets Δ H=2H/ (N+1), wherein H is the vertical range of the intersection point X of first circle of reference and second circle of reference to the line of centres C1C2 of first curvature center C 1 and torsion center C 2, Δ H is the difference in height of adjacent two bulge-structure 120d in the bulge-structure group 130, and Δ H is the vertical height of the top T of bulge-structure 120d (as Far Left among Fig. 7 B or rightmost bulge-structure) highly minimum in the bulge-structure group 130 to first surface 112.
In the present embodiment, because the height of the bulge-structure 120d in each bulge-structure group 130 is not exclusively equal, therefore can avoid optical sheet 130 and other blooming piece that is disposed at its top or optical element to produce Electrostatic Absorption and sticking glutinous phenomenon, and then guarantee the optical quality that blooming piece can be reached.In addition, the drift angle T of highly the highest bulge-structure 120d in the bulge-structure group 130 (as the bulge-structure between among among Fig. 7 B) also can form rounding, to increase the uniformity of light beam.
Fig. 8 is the profile of the optical sheet relief structure of yet another embodiment of the invention.With reference to Fig. 8, the optical sheet 100 of the optical sheet of present embodiment and Figure 1B and Fig. 1 C is similar, and both difference is as described below.In the optical sheet of present embodiment, the radius of curvature R 1 ' of the first crooked convex surface 122e of each bulge-structure 120e is not equal to the radius of curvature R 2 ' of the second crooked convex surface 124e.Such design can be in response to user's different demands, and make the light shape of the area source that backlight module provides need and adjust according to using.In other not shown embodiment, every N adjacent protrusion structure 120e also can form the bulge-structure group of similar Fig. 7 B, and the height of these bulge-structures 120e in each bulge-structure group is incomplete same, looks closely user's demand and adjusts.
In sum, the embodiment of the invention can have the one at least of following advantage or effect.In the optical sheet of the embodiment of the invention, the curvature of the first crooked convex surface and the second crooked convex surface and position meet the shape of first circle of reference and second circle of reference, the intersection point of first circle of reference and second circle of reference to the line at first curvature center is spent more than or equal to 25 with respect to the inclination angle of the line of centres at first curvature center and torsion center, and smaller or equal to 55 degree, and intersection point to the line at torsion center is spent more than or equal to 25 with respect to the inclination angle of this line of centres, and smaller or equal to 55 degree, so screening effect and briliancy be can promote simultaneously, and then the uniformity and the brightness of the area source that backlight module provided that adopts this optical sheet promoted.In the optical sheet of the embodiment of the invention, because these first crooked convex surfaces of all these bulge-structures have identical haply each other radius of curvature, and these of all these bulge-structures second crooked convex surface has identical haply each other radius of curvature, so this optical sheet can form comparatively uniform surface light source.
The above person only is the preferred embodiments of the present invention, and when not limiting scope of the present invention with this, promptly simple equivalent modification and the modification of being done according to claim of the present invention and invention description content generally all still belongs in the scope of the present invention.Arbitrary embodiment of the present invention in addition or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary and denomination of invention only are the usefulness that is used for assisting patent retrieval, are not to be used for limiting protection scope of the present invention.
Claims (20)
1. optical sheet comprises:
Transparent substrates has opposite first and second surface; And
A plurality of bulge-structures, be disposed on the described first surface, wherein each described bulge-structure has the first relative crooked convex surface and the second crooked convex surface, the described first crooked convex surface has the first curvature center, the described second crooked convex surface has the torsion center, described first curvature center and described torsion center lay respectively at the relative both sides of described bulge-structure, when being the center of circle with described first curvature center and being radius and when on perpendicular to described first surface and reference planes, making first circle of reference by described first curvature center and described torsion center with the radius of curvature of the described first crooked convex surface, and when being the center of circle with described torsion center and being radius and when on described reference planes, making second circle of reference with the radius of curvature of the described second crooked convex surface, the intersection point of described first circle of reference and described second circle of reference to the line at described first curvature center is spent more than or equal to 25 with respect to the inclination angle of the line of centres at described first curvature center and described torsion center, and smaller or equal to 55 degree, and described intersection point to the line at described torsion center is spent more than or equal to 25 with respect to the inclination angle of described line of centres, and smaller or equal to 55 degree.
2. optical sheet according to claim 1, wherein each described bulge-structure is the strip projected parts structure, each described strip projected parts structure is extended along first direction, and these strip projected parts structures are arranged along second direction, described line of centres is haply perpendicular to described first direction, the described first crooked convex surface is the face of cylinder of extending along described first direction, and the described second crooked convex surface is the face of cylinder of extending along described first direction.
3. optical sheet according to claim 2, wherein said first direction are haply perpendicular to described second direction.
4. optical sheet according to claim 1, wherein these bulge-structures meet L/2≤P≤2L, wherein L is described first with reference to the radius of a circle and described second length with reference to the overlapping part of radius of a circle on the described line of centres at described first curvature center and described torsion center, and P is the distance of top on the direction parallel with described first surface of adjacent two described bulge-structures.
5. optical sheet according to claim 1, wherein each described bulge-structure meets H/2≤H '≤H, wherein H ' is the vertical height of the top of described bulge-structure to described first surface, and H is the vertical range of the described intersection point of described first circle of reference and described second circle of reference to the described line of centres at described first curvature center and described torsion center.
6. optical sheet according to claim 1, wherein rounding is formed on the top of each described bulge-structure, and the radius of curvature of each described rounding is more than or equal to 5 microns, and smaller or equal to 10 microns.
7. optical sheet according to claim 1, wherein every N adjacent protrusion structure formed bulge-structure group, wherein N is more than or equal to 3, and N is smaller or equal to 9, these bulge-structures in each bulge-structure group are the mirror image balanced configuration, and the height of these bulge-structures in each described bulge-structure group is incomplete same.
8. optical sheet according to claim 7, wherein said bulge-structure group meets L/4≤P≤L, wherein P is the distance of top on the direction parallel with described first surface of adjacent two described bulge-structures in the described bulge-structure group, and L is described first with reference to the radius of a circle and described second length with reference to the overlapping part of radius of a circle on the described line of centres at described first curvature center and described torsion center.
9. optical sheet according to claim 7, wherein said bulge-structure group meets Δ H=2H/ (N+1), wherein H is the vertical range of the described intersection point of described first circle of reference and described second circle of reference to the described line of centres at described first curvature center and described torsion center, Δ H is the difference in height of adjacent two described bulge-structures in the described bulge-structure group, and Δ H is the vertical height of the top of described protruding structure structure highly minimum in the described bulge-structure group to described first surface.
10. optical sheet according to claim 1, the radius of curvature of the wherein said first crooked convex surface is not equal to the radius of curvature of the described second crooked convex surface.
11. an optical sheet comprises:
Transparent substrates has opposite first and second surface; And
A plurality of bulge-structures, be disposed on the described first surface, wherein each described bulge-structure has the first relative crooked convex surface and the second crooked convex surface, the described first crooked convex surface has the first curvature center, the described second crooked convex surface has the torsion center, described first curvature center and described torsion center lay respectively at the relative both sides of described bulge-structure, these of all these bulge-structures first crooked convex surface has identical haply each other radius of curvature, and these second crooked convex surfaces of all these bulge-structures have identical haply each other radius of curvature.
12. optical sheet according to claim 11, wherein when being the center of circle with described first curvature center and being radius and when on perpendicular to described first surface and reference planes, making first circle of reference by described first curvature center and described torsion center with the radius of curvature of the described first crooked convex surface, and when being the center of circle with described torsion center and being radius and when on described reference planes, making second circle of reference with the radius of curvature of the described second crooked convex surface, the intersection point of described first circle of reference and described second circle of reference to the line at described first curvature center is spent more than or equal to 25 with respect to the inclination angle of the line of centres at described first curvature center and described torsion center, and smaller or equal to 55 degree, and described intersection point to the line at described torsion center is spent more than or equal to 25 with respect to the inclination angle of described line of centres, and smaller or equal to 55 degree.
13. optical sheet according to claim 11, wherein each described bulge-structure is the strip projected parts structure, each described strip projected parts structure is extended along first direction, and these strip projected parts structures are arranged along second direction, described line of centres is haply perpendicular to described first direction, the described first crooked convex surface is the face of cylinder of extending along described first direction, and the described second crooked convex surface is the face of cylinder of extending along described first direction, and wherein said first direction is haply perpendicular to described second direction.
14. optical sheet according to claim 11, wherein these bulge-structures meet L/2≤P≤2L, wherein L is described first with reference to the radius of a circle and described second length with reference to the overlapping part of radius of a circle on the described line of centres at described first curvature center and described torsion center, and P is the distance of top on the direction parallel with described first surface of adjacent two described bulge-structures.
15. optical sheet according to claim 11, wherein each described bulge-structure meets H/2≤H '≤H, wherein H ' is the vertical height of the top of described bulge-structure to described first surface, and H is the vertical range of the described intersection point of described first circle of reference and described second circle of reference to the described line of centres at described first curvature center and described torsion center.
16. optical sheet according to claim 11, wherein rounding is formed on the top of each described bulge-structure, and the radius of curvature of each described rounding is more than or equal to 5 microns, and smaller or equal to 10 microns.
17. optical sheet according to claim 11, wherein every N adjacent protrusion structure formed bulge-structure group, wherein N is more than or equal to 3, and N is smaller or equal to 9, these bulge-structures in each bulge-structure group are the mirror image balanced configuration, and the height of these bulge-structures in each described bulge-structure group is incomplete same.
18. optical sheet according to claim 17, wherein said bulge-structure group meets L/4≤P≤L, wherein P is the distance of top on the direction parallel with described first surface of the adjacent two described bulge-structures in the described bulge-structure group, and L is described first with reference to the radius of a circle and described second length with reference to the overlapping part of radius of a circle on the described line of centres at described first curvature center and described torsion center.
19. optical sheet according to claim 17, wherein said bulge-structure group meets Δ H=2H/ (N+1), wherein H is the vertical range of the described intersection point of described first circle of reference and described second circle of reference to the described line of centres at described first curvature center and described torsion center, Δ H is the difference in height of adjacent two described bulge-structures in the described bulge-structure group, and Δ H is the vertical height of the top of described bulge-structure highly minimum in the described bulge-structure group to described first surface.
20. optical sheet according to claim 11, the radius of curvature of the wherein said first crooked convex surface is not equal to the radius of curvature of the described second crooked convex surface.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101158531A CN102155711A (en) | 2010-02-12 | 2010-02-12 | Optical sheet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101158531A CN102155711A (en) | 2010-02-12 | 2010-02-12 | Optical sheet |
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| CN102155711A true CN102155711A (en) | 2011-08-17 |
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| CN2010101158531A Pending CN102155711A (en) | 2010-02-12 | 2010-02-12 | Optical sheet |
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Application publication date: 20110817 |