CN103322504B - The secondary optical lens of the LED backlight system shown for flat liquid crystal - Google Patents
The secondary optical lens of the LED backlight system shown for flat liquid crystal Download PDFInfo
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- CN103322504B CN103322504B CN201210072730.3A CN201210072730A CN103322504B CN 103322504 B CN103322504 B CN 103322504B CN 201210072730 A CN201210072730 A CN 201210072730A CN 103322504 B CN103322504 B CN 103322504B
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Abstract
The invention discloses a kind of secondary optical lens of the LED backlight system shown for flat liquid crystal, bottom surface including the light distribution curved surface as exit facet and positioned at the light distribution curved surface bottom, from the upwardly recessed inner concave formed as the plane of incidence in the bottom surface, the centre at the top of the light distribution curved surface is provided with projection protruding upward, the beam angle full-shape of the secondary optical lens is more than or equal to 160 °, and the light of incidence is projected sequentially through after the inner concave, light distribution curved surface.The secondary optical lens have the beam angle more than more than 160 degree, can by LED most of light toward lens side surface direction outgoing, largest light intensity direction is being more than ± 80 degree of orientation with optical axis included angle, it uses very short light mixing distance just to produce the homogeneous light distribution of same scope on the lcd panel, light mixing distance can be reduced to less than 1/3rd of prior art, and can effectively reduce luminous energy loss.
Description
Technical field
The present invention is on a kind of secondary optical lens of the LED backlight system shown for flat liquid crystal.
Background technology
Because LED has the features such as efficient, energy-conservation, brightness are high, colour rendering index is good, existing most of flat liquid crystal is shown
Back light system employed LED illumination technology (i.e. LED semiconductor solid state illumination technology).And straight-down negative is illuminated
Mode because its light loss is few, the uniformity is high, LED can arbitrarily arrange, need not carry out the features such as complicated light guide plate mesh point design,
Praised highly by many producers.But, if directly using the primary shape distribution (Lambertian) of the high-power youth of in the market
LED, because its beam angle only has 120 degree, central light strength is relatively strong, it is necessary to which very big light mixing distance can just shield in LCD (liquid crystal)
Uniform light distribution is produced on curtain.Fig. 2 is without using secondary optical lens progress luminous intensity distribution, only with the primary shape LED direct illuminations of youth
Down straight aphototropism mode set, its light mixing distance is longer.
It is the one of 75 ° of angles that publication number CN101526177A patent, which proposes a kind of largest light intensity direction with optical axis included angle,
Downward back optical lens is planted, " incrementss (Δ θ 5/ Δ θ 1) of θ 5 incrementss relative to θ 1 are more as shown in figure 4, it is proposed
The emergent ray of concept greatly ", i.e. lens and the angle of optical axis are more than the angle of incident ray and optical axis, according to this luminous intensity distribution side
Method, although its LED emergent lights can be made into polarizers of big angle scope, largest light intensity direction and optical axis included angle be 75 ° of angles
Hot spot distribution.But the method for its luminous intensity distribution is simultaneously unreasonable, according to " incrementss (Δ θ 5/ Δ θ 1) of θ 5 incrementss relative to θ 1
It is bigger " this rule, when lens incident ray and optical axis angle theta 1 be 90 ° when, the angle theta of its emergent ray and optical axis
5 will be more than 90 °, so that the rear of meeting directive lens, gets on pcb board, cause the loss of luminous energy.It is interior below lens in addition
During recessed plane of incidence steeper, the center for causing hot spot is had shadow by this light distributing method.
The content of the invention
The purpose of the present invention be in view of the shortcomings of the prior art there is provided it is a kind of can effectively reduce luminous energy loss be used for put down
Secondary optical lens, LED backlight system and the LED illumination System of the LED backlight system of face liquid crystal display.
To achieve the above object, present invention employs following technical approach：A kind of LED backlight shown for flat liquid crystal
The secondary optical lens of system, including the light distribution curved surface as exit facet and the bottom surface positioned at the light distribution curved surface bottom, from institute
The upwardly recessed inner concave formed as the plane of incidence in bottom surface is stated, the centre at the top of the light distribution curved surface is provided with protruding upward
Projection, make the secondary optical lens beam angle full-shape be more than or equal to 160 °, and make incidence light sequentially through institute
State and projected after inner concave, light distribution curved surface.
Further, the secondary optical lens of the described LED backlight system shown for flat liquid crystal, its feature exists
In：The light distribution curved surface is selected from：The curved surface of continuous and derivable with intermediate projections, the ring grain diffraction surfaces acted on mixed light, tool
There are flakey curved surface, the cellular composite surface with mixed light effect, X and the Y-direction section profile of mixed light effect are different to mix
Ring grain compound curved surface, saddle-shape free form surface, Fresnel that conjunction free form surface, section profile line are made up of mini line segment and curve
Curved surface, quadrangle mixing free form surface, hexagon mixing free form surface, polygon mixing free form surface, nonaxisymmetrical freedom
Curved surface.
Further, the light distribution curved surface be with mixed light act on ring grain diffraction surfaces, its mixed light angle delta τ 2 °~
In the range of 15 °.
Further, the micro-structural of the ring grain diffraction surfaces is the periodic ring grain micro-structural of waveform, its Wave crest and wave trough
Value H is between 1~25 micron or bigger Wave crest and wave trough value, and the spacing P of ring grain is 0.05~5.0 millimeter.
Further, the light distribution curved surface is mixed by quadrangle mixing free form surface, hexagon mixing free form surface, polygon
Close free form surface, saddle-shape free form surface, Fresnel curved surface, flakey curved surface, X and the different mixing of Y-direction section profile certainly
At least two are composited in curved surface.
Further, the bottom surface is provided with least one card base.
Further, the light distribution curved surface is provided with light control material layer.
Further, the light distribution curved surface is provided with micro-structural lines such as light modulation frosted, netted lines.
Further, light control material is provided with the lens.
Further, the combination of materials that the lens can have one or more is formed.
Further, the inner concave is coned face, four sides taper surface, polyhedral cone shaped face or by coned face and multiaspect
The compound composition of taper surface.
Further, the ring grain diffraction surfaces acted on the inner concave with mixed light or Fresnel (Fresnel) face, it is described
Ring grain micro-structural can be the periodic ring grain micro-structural of waveform.
Further, the light distribution curved surface is with optical condition：
, wherein, θmaxFor the maximum light distribution angle of lens, θmaxMore than or equal to 80 °, θ 5 is the outgoing of the light distribution curved surface
Angle.
Further, the projection is circular arc, flat-top shape, cone, multiaspect cone or cusp configuration.
Further, the light distribution curved surface is further selected from carrying under middle concave：Curved surface, X and the Y-direction of continuous and derivable are cutd open
Facial contour it is different mixing free form surface, saddle-shape free form surface, Fresnel curved surface, flakey curved surface, with mixed light act on
Cellular composite surface, nonaxisymmetrical free form surface.
Further, the bottom surface is selected from：Frosted micro-structural face, netted or micro-structural with regular pattern, carry
Surface spraying reflectorized material, ring grain micro-structural, the micro-structural of cellular plaited surface arrangement, the micro-structural of hexagon circular cone arrangement, four
The pyramid micro-structural or Fresnel tooth form micro-structural curved surface of side shape arrangement.
The LED backlight system that a kind of flat liquid crystal is shown, including described secondary optical lens.
A kind of LED backlight illuminator, including described secondary optical lens.
The beneficial effects of the invention are as follows：The present invention proposes a kind of secondary optical lens, and it, which has, is more than more than 160 degree
Beam angle, can by LED most of light toward lens side surface direction outgoing, largest light intensity direction with optical axis included angle for ±
More than 80 degree of orientation, it uses very short light mixing distance just to produce the uniform light point of same scope on the lcd panel
Cloth, light mixing distance can be reduced to less than 1/3rd of prior art, and can effectively reduce luminous energy loss.
Brief description of the drawings
Fig. 1 is the profile of the first embodiment of secondary optical lens；
Fig. 2 is showing for the light mixing distance for the LED backlight module for showing the existing straight-down negative illumination without secondary optical lens
It is intended to；
Fig. 3 is the schematic diagram for the light mixing distance for showing the direct-light type LED backlight module for having added secondary optical lens of the present invention；
Fig. 4 is the structural representation of the lens disclosed in Publication No. CN101526177A Chinese patent；
Fig. 5 a~5e is front view, top view, right view, upward view and the stereogram of the first embodiment respectively；
Fig. 6 is the design principle figure of the first embodiment；
Fig. 7 is the mathematical modeling figure of the light distribution curved surface contour line of the first embodiment；
Fig. 8 is the three-dimensional model diagram of the single lens using the first embodiment；
Fig. 9 a, 9b are the ray tracing figures of the first embodiment；
Figure 10 is the secondary optical lens of the first embodiment in the illumination on the high screens of LED-baseplate 25mm
Distribution map；
Figure 11 is the distribution curve flux figure of the secondary optical lens of the first embodiment, it can be seen that its distribution curve flux is in
Batswing tab is distributed, and largest light intensity direction is being light beam angular width at ± 80 ° of orientation, peak light intensity half position with optical axis included angle
About ± 82 ° of degree,
Figure 12 is to multiply 6 LEDs using the 6 of the first embodiment, LED intervals 110mm, screen distance LED-baseplate
It is highly 25mm ray tracing figure (only counting the light being mapped on screen)；
Figure 13 is to multiply 6 LEDs using the 6 of the first embodiment, is spaced 110mm, and the distance apart from LED-baseplate is
Illumination Distribution figure on 25mm screen；
Figure 14 is the profile of the secondary optical lens of the second embodiment；
Figure 15 a~15e be respectively the front views of the secondary optical lens of the second embodiment, top view, right view,
Upward view and stereogram；
Figure 16 is the profile of the secondary optical lens of the 3rd embodiment；
Figure 17 is the profile of the secondary optical lens of the 4th embodiment；
Figure 18 a, 18b are the profile and upward view of the secondary optical lens of the 5th embodiment respectively；
Figure 19 a, 19b are the profile and upward view of the secondary optical lens of the 6th embodiment respectively；
Figure 20 a, 20b are the upward view of the secondary optical lens of the seven, the eight embodiments respectively；
Figure 21 a~21d is front view, top view, the left view of the secondary optical lens of the 9th embodiment respectively
And upward view；
Figure 22 a~22d is front view, top view, the left view of the secondary optical lens of the tenth embodiment respectively
And upward view.
Figure 23 is the structural representation of the secondary optical lens of the 11st embodiment；
Figure 24 is the incident ray of the light distribution curved surface of the first embodiment and optical axis OZ angle theta 1 and emergent light
Line and the graph of relation of optical axis OZ angle theta 5.
Embodiment
The present invention is described in further detail below by embodiment combination accompanying drawing.
First embodiment：
As shown in figure 1, the first of the secondary optical lens of its LED backlight system shown for the present invention for flat liquid crystal
There is a conical inner concave 11 in embodiment, the centre of the optical lens bottom, and it is the plane of incidence；Lens
One flat light distribution curved surface 12 is arranged at top, and it is exit facet, and it is the curved surface of continuous and derivable；The curved surface 12 of the lensed tip
There is an obvious projection 13 in centre, and projection is circular arc；The bottom surface 14 of lens is Non-optical surfaces, and it has above is used for
Collect the prism of corner cube type retro-reflection micro-structural face 141 of veiling glare；So-called prism of corner cube refers to scale off on regular cube
An angle, its three faces are all mutually perpendicular to, so being called prism of corner cube；By miniature prism of corner cube in the way of regular hexagon
The micro structure array of arrangement, it can play retro-reflection by incident light along backtracking；It is placed on lens bottom
The prism of corner cube type retro-reflection micro-structural face 141 in face can for by the parasitic reflection at directive lens rear return before, shine
In LCD.There is three card bases 15 for being used for positioning the bottom of the other lens, and is spaced relative to lens centre along 120 degree
Place, for lens are fixed on LED circuit board.The structure of the secondary optical lens of the embodiment such as Fig. 5 a~5e and
Shown in Fig. 1.
The luminous intensity distribution principle of the embodiment secondary optical lens is as shown in fig. 6, the light sent from LED chip, passes through
After conical inner concave 11 is reflected, both sides are assigned to, are incided in the light distribution curved surface 12 of outside, emergent ray is made into light by curved surface 12
Beam angle half width is ± θmaxWithin the scope of hot spot distribution, θmaxAngle is more than 80 °, here preferably 82 °.As can be seen that outgoing
Light is from centre to edge, and its angle with optical axis OZ is gradient to θ from 0 ° of degreemaxAngle.Arc-shaped convex 13 is located at conical indent
The surface on the pinnacle in face, because light is reflected by conical inner concave 11 to side, no light incides projection 13, therefore
Projection 13 is not risen with light action, and it can also be other shapes, see third and fourth embodiment.
The mathematical modeling of the specific contour line of light distribution curved surface 12 is as shown in Figure 7, it is assumed that from LED chip light-emitting area center O points
The incident ray OP sent and optical axis OZ angles are θ, and it is after the P points refraction on conical inner concave 11, and refracted light is
Light distribution curved surface 12 on the outside of PQ, PQ friendship is projected in Q points after reflecting again with emergent ray QR.PN ' is the normal of P points position,
PH ' is the horizontal line of P points position, and α is incidence angles of the light OP in P points position, and ε is light PQ at the refraction angle of P points position, η
For light PQ Q points position incidence angle, ρ be emergent ray QR Q points position the angle of emergence, μ for curve 12 tangent line QT with
Horizontal line QH " angle.The emergent ray QR and horizontal line QH " of lens angle are τ, and the angle with optical axis OZ is θ 5.Assuming that
Angle of the maximum light distribution angle (half width) relative to optical axis OZ of lens is ± θmax, the hot spot on screen is evenly distributed,
Then output angle θ 5, which is met, following matches somebody with somebody optical condition：
Wherein θmaxFor the maximum light distribution angle (half width) of lens, it is in 80 °≤θmaxBetween≤90 °.Assuming that θmaxFor
80 °, then as 78.75 ° of incidence angle θ ＜, QR light distribution angle θ 5 is more than the angle, θ of incident ray, and when θ slowly close
θmax, more than 78.75 ° when 90 ° of this scopes, the angle theta 5 of its emergent ray and optical axis OZ restrains at leisure, in this model
The incrementss of θ 5 in enclosing are less than θ incrementss, thus the incident ray of its all 0 °~90 ° scope that can send LED
The angle of emergence is all evenly distributed in for 0 °~θmaxIn the range of, the loss without luminous energy.
Triangle OBP in figure, hasDraw：
According to Snell laws of refraction (Snell Law), have in P points position：
Sin α=nsin ε
N is the refractive index of lens material in above formula.According to H ' P perpendicular to optical axis OZ, have：
It is equal according to the angle of P points both sides, have：
δ is light OP and horizontal line PH ' angle in formula, and φ=β-ε are understood by above formula.Additionally, due to PH ' parallel to QH "
According to Snell laws of refraction (Snell Law), there are nsin η=sin ρ in Q points position
I.e.：
Because QT is tangent line of the curve 12 in Q points position, its slope dy/dx is tangent tangent of an angle value：
Figure 24 is the incident ray of the light distribution curved surface 12 of the first embodiment and optical axis OZ angle theta 1 and outgoing
Light and the graph of relation of optical axis OZ angle theta 5.Because the plane of incidence of cone is employed herein, from two songs in figure
Line can be seen that：When θ 1 is when within 10 °, its θ 5 incrementss are less than θ 1 incrementss, thus its spot center will not produce
Shadow；When θ 1 is at 10 ° to θmaxBetween when, its θ 5 incrementss are just more than θ 1 incrementss；And work as θ 1 close to θmaxUntil 90 °
When, the angle theta 5 of its emergent ray and optical axis OZ restrains at leisure again, and the incrementss of the θ 5 in the range of this are less than θ 1 increase
Amount, thus its all 0 °~90 ° scope that LED can be sent incident ray be all evenly distributed in the angle of emergence for 0 °~
θmaxIn the range of, the loss without luminous energy.
With reference to luminous intensity distribution condition formula (1), and formula (5), (6), (7), when LED emergent rays OP and optical axis angle theta
From during 90 degree~0 degree change, numerical integration is carried out to dx, dy, it is possible to draw at different θ angles, the coordinate of each point of curved surface 12
(x, y) numerical solution.By coordinate (x, y) value of each point of curved surface 12, it is input in 3 d modeling software and is connected with B- SPLs
Can be obtained by the section profile line of light distribution curved surface 12.In conjunction with conical inner concave 11, projection 13, bottom surface 14 and angle
Cone prism micro-structural retro-reflection face, it is possible to complete the threedimensional model of secondary optical lens described in first embodiment, such as Fig. 8
It is shown.
Fig. 8 is single lens of first embodiment and LED three dimensional computer modeling figure, and LED bottom surface is blocked with three
The bottom surface of pin is on same horizontal plane.
The three-dimensional entity model of lens described in the present embodiment established is input in photometric analysis software just
It can be simulated.
It is the computer simulation and photometric analysis of the first embodiment below, it is assumed that LED model Philip is public
The Luxeon Rebel White Display LED of department, luminous flux is 90 lumens, and the height of screen distance LED-baseplate is
25mm, is below the computer simulation of single lens.
Fig. 9 a, 9b are the ray tracing figure of the secondary optical lens of the first embodiment, it can be seen that emergent ray
Angle it is very wide, most light directive side, the light in the middle of directive is fewer.
Figure 10 is the secondary optical lens of the first embodiment in the high LCDs of LED-baseplate 25mm
Illumination Distribution figure.It can be seen that the scope of hot spot is very big, the position of maximal illumination value 10%, the size of hot spot is left for 300mm
The right side, the position of maximal illumination value 50%, size about 150mm or so of hot spot.
Figure 11 is the distribution curve flux figure of the secondary optical lens of the first embodiment, it can be seen that its distribution curve flux is in
Batswing tab is distributed, and largest light intensity direction is being light beam angular width at ± 80 ° of orientation, peak light intensity half position with optical axis included angle
About ± 82 ° of degree.
Multiply 6 LEDs for 6 below, be spaced 110mm, the height apart from LED-baseplate is in 25mm LCD (screen)
Photometric analysis, screen size is set to 550mm and multiplies 550mm：
Figure 12 is the 6 ray tracing figures for multiplying 6 LEDs.Figure 13 is the illumination on for 25mm screen apart from LED-baseplate
Distribution map, from figure it was found from the following and illumination curve of cyclical fluctuations on the right, very big brightness value about 7500Lux, minimum photograph on screen
Angle value about 6500Lux, its uniformity is about η=Imin/Imax100% ≈ 86.6%, has reached than more uniform illuminating effect.
Second embodiment：
Fluorescent powder coated when LED chip must be diluter, when surface covered is relatively large, using the first embodiment
Described secondary optical lens carry out luminous intensity distribution to LED emergent lights, because light distribution angle is very big, it is possible to can be produced on screen
The inconsistent situation that colour temperature is high in the middle of hot spot, hot spot edge colour temperature is low, so as to cause the color uniformity of LCD bad.
Second embodiment of the present invention proposes the solution for such case.
The profile of second embodiment is as shown in figure 14, other all in addition to the light distribution curved surface 22 in outside
Feature all as the first embodiment, the light distribution curved surface 22 in outside is designed to spreading out with ring grain micro-structural here
Face is penetrated, makes emergent light around the mixed light of main emergent ray QR generations ± Δ τ low-angle, the difference of colour temperature can be improved.Typically
For Δ τ in the range of 2 °~5 °, preferably 3 ° here.Ring grain micro-structural described here is preferably the periodic ring of waveform
Line micro-structural, its Wave crest and wave trough value H is 8 microns, and the spacing P of ring grain is 0.5 millimeter, is matched somebody with somebody in the outside of the first embodiment
Described ring grain micro-structural is added on light curved surface 12, it can produce about ± 3 ° of mixed light, so as to solve color temperature difference in LCD
Different the problem of.The second described embodiment, the curved surface in outside is in addition to corrugated ring grain diffraction surfaces, and it can be with
The ring grain face being made up of for section profile line small straightway, can also play the light mixing effect in a good low-angle.
Figure 15 a~15e is the front view of the second involved embodiment, top view, right view, upward view and vertical
Also have the prism of corner cube type retro-reflection micro-structural face 241 for being used for collecting veiling glare, the outer lateral curvature of lens in body figure, the bottom surface 24 of lens
Face 22 is the diffraction surfaces of ring grain micro-structural, and the projection 23 of a circular arc is also arranged at the top of lens.
Third and fourth embodiment：
Secondary optical lens involved in the present invention, because the conical inner concave of lens reflects LED light to side,
There is no light to incide the projection of center of surface, therefore raised part is not risen with light action, its lensed tip center of surface
Projection, can also be flat-top shape, cusp configuration or other shapes；
Figure 16 is the profile of the secondary optical lens of the 3rd embodiment involved in the present invention.Due to lens circle
Taper inner concave reflects LED light to side, and the top surface 33 of projection is incided without light, therefore top surface 33 does not play luminous intensity distribution
Top surface 33 is plane in effect, present embodiment.
Figure 17 is the profile of the secondary optical lens of the 4th embodiment involved in the present invention.Due to lens circle
The taper indent conical surface reflects LED light to side, and no light incides light distribution curved surface 43, therefore curved surface 43 does not play luminous intensity distribution
Light distribution curved surface 43 is epiconus top surface in effect, present embodiment.
5th to the 8th embodiment：
Because the bottom of secondary optical lens involved in the present invention is Non-optical surfaces, it can be any surface, on
Face can do any processing, including common machined surface, frosting, retro-reflection micro-structural face for collecting veiling glare etc..
Figure 18 a, 18b be respectively the secondary optical lens of the 5th embodiment involved in the present invention profile and
Upward view.The bottom surface of lens has frosting 541, and it breaks up the veiling glare at directive lens rear, and part is reflected back lens
Front, if the paint of its coated white above, the effect for collecting veiling glare can be more preferable.
Figure 19 a, 19b be respectively the secondary optical lens of the 6th embodiment involved in the present invention profile and
Upward view.The bottom surface of lens is with the ring grain micro-structural face 641 of 90 degree of V-grooves, and it also plays retro-reflection, and directive is saturating
The veiling glare at mirror rear, is reflected back the front of lens.
Figure 20 a, 20b are the upward view of the secondary optical lens of the seven, the eight embodiments of the invention respectively.The 7th
In embodiment, the bottom surface of lens has the conical micro-structural face 741 by hexagonal array, and it plays retro-reflection
Effect, by the veiling glare at directive lens rear, is reflected back the front of lens.In the 8th embodiment, the bottom surface of lens is attached
There is the pyramid micro-structural face 841 by quadrangular array, it also functions to the effect of retro-reflection, by the miscellaneous of directive lens rear
Light, is reflected back the front of lens.In addition to the bottom surface of lens, other all faces of the seven, the eight embodiments are all with
One embodiment is the same.
As shown in Figure 21 a~21d, in addition to the light distribution curved surface 92 in the outside of secondary lens and bottom surface 94, Qi Tasuo
The light distribution curved surface 92 in outside is designed with the freedom of quadrangle by some features here all as the first embodiment
Curved surface, LED/light source is projected after the plane of incidence of lens, then via the outside curve with quadrangle free form surface, makes outgoing
Light spot shape turns into the light shape of quadrangle, can also equally realize equally distributed wide-angle light distribution effect.
As shown in Figure 22 a~22d, light distribution curved surface 102 and incident inner concave 101 and bottom except the outside of secondary lens
Outside face 104, other all features here design the light distribution curved surface 102 in outside all as the first embodiment
Concave prism in six face cone shapes is designed into the free form surface with hexagon, and by the plane of incidence of lens.LED/light source is incided
In six face cone shapes of lens after concave prism, then via the outside curve injection with hexagon free form surface, make the hot spot of outgoing
The light shape of hexagon is shaped as, equally distributed wide-angle light distribution effect can also be equally realized.
As shown in figure 23, in addition to the light distribution curved surface 112 in the outside of secondary lens, other all features are all with first
Embodiment is the same, and the light distribution curved surface 112 in outside is designed to the cellular composite surface acted on mixed light here.When
So, light distribution curved surface can also be Fresnel curved surface or flakey curved surface.
The present invention relates to a kind of secondary optical lens of the LED direct type backlighting systems shown for flat liquid crystal.This is saturating
Mirror bottom center has a conical inner concave, and it is the plane of incidence；There is a flat light distribution curved surface at the top of lens, its
For exit facet, curved surface can be the curved surface of continuous and derivable, or the ring grain diffraction surfaces acted on mixed light, or be section
Ring grain face or Fresnel (Fresnel) curved surface that contour line is made up of small straightway, or for quadrangle mixing free form surface,
Hexagon mixing free form surface, squamation shape curved surface, X and the different mixing of Y-direction section profile with mixed light effect are certainly
By curved surface, saddle-shape free form surface, free bent and other the nonaxisymmetrical free form surfaces of hexagon mixing；The lensed tip
Curved surface, the center portion thereof position has one obvious raised, and bossing can be circular arc, flat-top shape or cusp configuration；Lens
Bottom surface is Non-optical surfaces, and it can be any surface, can do any processing above, including common machined surface, frosting,
Retro-reflection micro-structural face for collecting veiling glare etc..The bottom surface of other lens can also be equipped with for fixed card base, root
According to needing can have different shapes, size and position, for lens are fixed on LED circuit board.
Described secondary optical lens, the light sent from LED chip, after the refraction of taper inner concave 11, directive side,
And incide on the outside curves 12 of lens, the half width that emergent ray is made into beam angle is ± θ by outside curvemaxScope it
Interior hot spot distribution, θmaxThe beam angle full-shape that angle is more than or equal to 80 °, i.e. lens is more than or equal to 160 °.By on the outside of lens
The emergent ray of the luminous intensity distribution of curved surface 12, from centre to edge, its angle with optical axis OZ is gradient to θ from 0 ° of degreemaxAngle.
Described secondary optical lens, lens outside curve 12, which is met, matches somebody with somebody optical condition：
θmaxFor the maximum light distribution angle (beam angle half width) of lens, θmaxMore than or equal to 80 °.
Projection 13 is located at the surface on conical surface pinnacle, and the light sent due to LED is rived by conical inner concave and to side
Face is reflected, from projection 13 incided without light in the middle of curved surface, therefore bossing is not risen with light action, and it can be to justify
Arc, flat-top shape, cone or cusp configuration.
Described secondary optical lens, the curved surface of its lens outgoing can also be the ring grain diffraction surfaces acted on mixed light,
Its mixed light angle delta τ is in the range of 2 °~15 °.Described ring grain micro-structural can be the periodic ring grain micro-structural of waveform,
Its Wave crest and wave trough value H is between 5~25 microns, the spacing P of ring grain is 0.05~1.0 millimeter.
Described secondary optical lens, what its lens outgoing curved surface can also be made up of for section profile line small straightway
Ring grain face or Fresnel (Fresnel) curved surface.
Described secondary optical lens, because lens indent circular conical surface reflects LED light to side, no light enters
The projection in the centre of curved surface is mapped to, therefore raised part is not risen with light action, the centre of its lensed tip curved surface
Projection, can also be flat-top shape, cusp configuration or other shapes.
Described secondary optical lens, its bottom is Non-optical surfaces, and it can be any surface, can do above any
Processing, including common machining surface, frosting, the reply for collecting veiling glare, reflection micro-structure face etc., it above can also
The reflectorised paint of coated white adds reflecting piece.
Described secondary optical lens, its lens bottom center has a conical inner concave, and it is the plane of incidence,
This plane of incidence can also be the ring grain diffraction surfaces or Fresnel (Fresnel) curved surface acted on mixed light, the micro- knot of described ring grain
Structure can be the periodic ring grain micro-structural of waveform, and it can be coned face, four sides taper surface, polyhedral cone shaped face or by justifying
Taper surface and polyhedral cone shaped face composite construction.
Described secondary optical lens, its emergent light spot can be circular or square, or hexagon is polygon
Type, or simultaneous with two or more light spot shape.
Described secondary optical lens, the outgoing curved surface of its lens can be round curved surface, or outline is four
The free form surface of side shape or hexagon, or be that outline is polygonal free form surface, also think two or more
Curved surface is combined on the outgoing curved surface of this lens.
Described secondary optical lens, the incident curved surface of its lens can be cone or six face cone shapes, or by
The conical camber of the compound composition in multiple faces.
Described secondary optical lens, the base of its lens can be circular or quadrangle, can also hexagon or polygon
Shape.
Described secondary optical lens, are preferably to reach the luminous intensity distribution uniformity, and the outgoing curved surface of lens can also be in injection
After shaping light control material is applied with post-processing or print.
Described secondary optical lens, can realize this light using two or more material composition one or split
Learn illuminator.
Described secondary optical lens, the positioning card base of lens can be circular or other shapes, and quantity can be two
Or it is multiple.
Described secondary optical lens, the Non-optical surfaces of lens bottom collection veiling glare, can there is one or more curved surfaces
Constitute.
Patent CN101526177A is contrasted, the present invention proposes a kind of rational luminous intensity distribution technology, and it can be by all from LED
Angle that light source is projected, that emergent ray and optical axis are all fitted over incident ray that optical axis included angle is 0 °~90 ° scopes is 0 °~
θmaxIn the range of, wherein θmaxFor maximum light distribution angle, it exceedes 75 ° described in patent CN101526177A, 80 °≤
θmax≤ 90 °, it is hereby achieved that the shorter luminous intensity distribution of light mixing distance, and light does not have the rear of directive lens, the damage of no luminous energy
Consumption.The present invention can also use the conical incidence surface of steeper, can obtain luminous intensity distribution of the largest light intensity more than 75 degree.For
The luminous intensity distribution of outside light distribution curved surface, when θ 1 is when within 10 °, its θ 5 incrementss are less than θ 1 incrementss, to compensate in hot spot
Between shadow；When θ 1 is at 10 ° to θmaxBetween when, its θ 5 incrementss are just more than θ 1 incrementss；And work as θ 1 close to θmaxUntil
At 90 °, the angle theta 5 of its emergent ray and optical axis OZ restrains at leisure again, and the incrementss of the θ 5 in the range of this are less than θ 1 increasing
Dosage, thus the incident ray of its all 0 °~90 ° scope that can send LED/light source is all evenly distributed in the angle of emergence and is
0 °~θmaxIn the range of, the loss without luminous energy.
Above content is to combine specific embodiment further description made for the present invention, it is impossible to assert this hair
Bright specific implementation is confined to these explanations.For general technical staff of the technical field of the invention, do not taking off
On the premise of from present inventive concept, some simple deduction or replace can also be made, the protection of the present invention should be all considered as belonging to
Scope.
Claims (16)
1. a kind of secondary optical lens of the LED backlight system shown for flat liquid crystal, including it is bent as the luminous intensity distribution of exit facet
Face and the bottom surface positioned at the light distribution curved surface bottom, it is characterised in that：From the bottom surface, upwardly recessed formation is used as the plane of incidence
Inner concave, the centre at the top of the light distribution curved surface is provided with projection protruding upward, makes the light of the secondary optical lens
Beam angle full-shape is more than or equal to 160 °, and the light of incidence is projected sequentially through after the inner concave, light distribution curved surface；It is described to match somebody with somebody
Light curved surface is with optical condition：
Wherein, θ max are the maximum light distribution angle of lens, and θ max are more than or equal to 80 °, and θ 5 is the angle of emergence of the light distribution curved surface,
θ is incidence angle, and τ is the emergent ray and horizontal angle of lens.
2. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：The light distribution curved surface is selected from：The curved surface of continuous and derivable with intermediate projections, the ring grain diffraction surfaces acted on mixed light, tool
There are flakey curved surface, the cellular composite surface with mixed light effect, X and the Y-direction section profile of mixed light effect are different to mix
Ring grain compound curved surface, saddle-shape free form surface, Fresnel that conjunction free form surface, section profile line are made up of mini line segment and curve
Curved surface, polygon mixing free form surface, nonaxisymmetrical free form surface.
3. the secondary optical lens of the LED backlight system shown as claimed in claim 2 for flat liquid crystal, its feature exists
In：The light distribution curved surface is the ring grain diffraction surfaces acted on mixed light, and its mixed light angle delta τ is in the range of 2 °~15 °.
4. the secondary optical lens of the LED backlight system shown as claimed in claim 2 for flat liquid crystal, its feature exists
In：The micro-structural of the ring grain diffraction surfaces is the periodic ring grain micro-structural of waveform, and its Wave crest and wave trough value H is 1~25 micron
Between, the spacing P of ring grain is 0.02~5.0 millimeter.
5. the secondary optical lens of the LED backlight system shown as claimed in claim 2 for flat liquid crystal, its feature exists
In：The light distribution curved surface is by polygon mixing free form surface, saddle-shape free form surface, Fresnel curved surface, flakey curved surface, X and Y
At least two are composited in the different mixing free form surface of directional profile profile.
6. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：The bottom surface is provided with least one card base.
7. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：The light distribution curved surface is provided with light control material layer.
8. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：The light distribution curved surface is provided with light modulation frosted or netted line micro-structural line.
9. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：Light control material is provided with the lens.
10. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：The lens are formed by one or more kinds of combinations of materials.
11. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：The inner concave is coned face, polyhedral cone shaped face or constituted by coned face and polyhedral cone shaped face are compound.
12. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：The ring grain diffraction surfaces or Fresnel surface acted on the inner concave with mixed light, described ring grain micro-structural is waveform week
The ring grain micro-structural of phase property.
13. the secondary optical lens of the LED backlight system shown as claimed in claim 1 for flat liquid crystal, its feature exists
In：The projection is circular arc, flat-top shape, cone, multiaspect cone or cusp configuration.
14. the secondary optical lens of the LED backlight system according to claim 1 shown for flat liquid crystal, its feature
It is：The bottom surface is selected from：It is frosted micro-structural face, netted or micro-structural with regular pattern, reflective with surface spraying
Material, ring grain micro-structural, the micro-structural of cellular plaited surface arrangement, the micro-structural of hexagon circular cone arrangement, the gold of quadrangular array
Word tower micro-structural or Fresnel tooth form micro-structural curved surface.
15. the LED backlight system that a kind of flat liquid crystal is shown, it is characterised in that：Including any one institute in claim 1-14
The secondary optical lens stated.
16. a kind of LED backlight illuminator, it is characterised in that：Including the secondary light described in any one in claim 1-14
Learn lens.
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| CN201210072730.3A CN103322504B (en) | 2012-03-19 | 2012-03-19 | The secondary optical lens of the LED backlight system shown for flat liquid crystal |
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| CN201210072730.3A CN103322504B (en) | 2012-03-19 | 2012-03-19 | The secondary optical lens of the LED backlight system shown for flat liquid crystal |
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| CN103322504A CN103322504A (en) | 2013-09-25 |
| CN103322504B true CN103322504B (en) | 2017-08-11 |
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| CN201210072730.3A Expired - Fee Related CN103322504B (en) | 2012-03-19 | 2012-03-19 | The secondary optical lens of the LED backlight system shown for flat liquid crystal |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104317100B (en) | 2014-10-13 | 2017-03-22 | 青岛海信电器股份有限公司 | Luminescent device and backlight source |
| CN106287569A (en) * | 2015-05-26 | 2017-01-04 | 瑞仪光电(苏州)有限公司 | Optical lens, backlight module |
| CN105118714B (en) * | 2015-07-13 | 2018-09-04 | 东莞市美光达光学科技有限公司 | A kind of ultrathin type optical reflection type has the input equipment switch module of dentalation |
| CN107152618B (en) * | 2016-03-04 | 2019-10-29 | 光宝科技股份有限公司 | Lens and optical unit with the lens |
| JP6757264B2 (en) * | 2017-01-23 | 2020-09-16 | 株式会社エンプラス | Luminous flux control member, light emitting device, surface light source device and display device |
| CN106970451A (en) * | 2017-01-24 | 2017-07-21 | 玉晶光电(厦门)有限公司 | Optical mirror slip |
| US10400986B2 (en) * | 2017-08-04 | 2019-09-03 | Lumileds Holding B.V. | Extremely wide distribution light-emitting diode (LED) lens for thin direct-lit backlight |
| CN110056839B (en) * | 2019-04-02 | 2021-03-09 | 福建华佳彩有限公司 | Secondary lens structure with reflection effect |
| CN112394427B (en) * | 2020-09-11 | 2022-05-10 | 禾橙科技股份有限公司 | Optical lens, optical lens forming mold and manufacturing method thereof |
| CN113934058B (en) * | 2021-10-29 | 2023-06-20 | 深圳创维－Rgb电子有限公司 | Optical assembly, backlight module and display device |
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| US8186838B2 (en) * | 2009-10-05 | 2012-05-29 | Edison Opto Corporation | Optical lens |
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| CN103322504A (en) | 2013-09-25 |
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