CN103322505A - Secondary optical lens used in liquid crystal display backlight system - Google Patents
Secondary optical lens used in liquid crystal display backlight system Download PDFInfo
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- CN103322505A CN103322505A CN2012100867845A CN201210086784A CN103322505A CN 103322505 A CN103322505 A CN 103322505A CN 2012100867845 A CN2012100867845 A CN 2012100867845A CN 201210086784 A CN201210086784 A CN 201210086784A CN 103322505 A CN103322505 A CN 103322505A
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Abstract
The invention discloses a secondary optical lens used in a liquid crystal display backlight system. The secondary optical lens comprises a bottom surface and a light distribution curved surface, wherein the middle part of the top of the light distribution curved surface is upwards bulged to form a bulge part, and the outer side surface of the bulged part adopts a cylindrical light emitting surface; the middle part of the top of the bulged part is downwards recessed to form a total reflection surface, and a step is formed in the total reflection surface; and the middle part of the bottom surface is upwards recessed to form an inner groove, the inner groove is provided with a side surface and a light focusing surface located at the top of the side surface, the side surface adopts a revolution surface and enables a part of incident light to be focused by the light focusing surface and then to be shot to the total reflection surface, and the reflected light is shot through the outer side surface of the bulged part. The secondary optical lens realizes light distribution with a full beam angle larger than or equal to 170 degrees through a method of combining refraction and total reflection, the distance between an LED substrate and an LCD screen can be further shortened, and the thickness of the backlight system is reduced greatly.
Description
Technical field
The invention relates to a kind of secondary optical lens for large-screen lc display backlight system.
Background technology
The LED-backlit system of straight-down negative (being about to the illuminator that LED is arranged in the below direct illumination liquid crystal display panel of LCD screen), because it is simple in structure, light loss is few, the complicated features such as light guide plate mesh point design can arbitrarily be arranged, need not be carried out to high, the good evenness of colour developing prime number, LED, obtained using more and more widely.Pursue the development trend that more and more thinner and uniform illumination is the back light system of giant-screen LCD (liquid crystal display), secondary optical lens is the key factor that plays a decisive role.Although existing most of secondary optical lens can reduce the thickness of back light system to a great extent, but it has a bottleneck that is difficult to go beyond, in the back light system that can accomplish in the market, the height of the limit of its secondary optical lens/wide is generally about 0.25 than (namely from the substrate of LED to the distance of lcd screen and the ratio of LED arrangement pitches), exactly when the LED spacing is the 100mm arrangement, distance from the substrate of LED to lcd screen need to be approximately 25mm, will produce over against the spot center of LED position less than 0.25 excessively bright, thereby be difficult to realize the Uniform Illumination of lcd screen.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, a kind of secondary optical lens that can effectively reduce back light system thickness is provided.
For achieving the above object, the present invention has adopted following technical approach: a kind of secondary optical lens, the light distribution curved surface that comprises the bottom surface and upwards arch upward and form from the edge of described bottom surface, the middle part at described light distribution curved surface top formation projection protruding upward, the lateral surface of described projection is cylindrical exiting surface, the middle part of described convex top is the recessed fully reflecting surface that forms downwards, be provided with step in the described fully reflecting surface, from the middle part of described bottom surface to being recessed on the formation inner groovy, described inner groovy has the side and is positioned at the caustic surface of described side top, described side is the surface of revolution, after a part that makes incident ray is assembled by described caustic surface, the described fully reflecting surface of directive, the light after the total reflection is by the lateral surface outgoing of described projection; Another part of described incident ray is after the refraction of the side of described inner groovy, through described light distribution curved surface outgoing.This secondary optical lens can be used for the LCD backlight system.
Further, the side of described inner groovy is the circular arc surface of revolution, and the hatching of the described circular arc surface of revolution is circular arc, and all normals of described circular arc all intersect at the N point, and the summit P of described N point and circular arc is in same level.
Further, described cylindrical curved surface is just round or non-just round sweep surface (Sweep Surface).
Further, described reflecting surface be coned face, with the conical surface of Fresnel line, the compound conical surface of ring grain that the section profile line is comprised of mini line segment and curve, four sides taper surface, polyhedral cone shaped or by coned face and polyhedral cone shaped compound the composition.
Further, the reflection mode of described reflecting surface is total reflection, non-total reflection or part total reflection.
Further, the side of described inner groovy and the transition of caustic surface wedge angle or arc transition.
Further, described light distribution curved surface makes emergent light center on the low-angle mixed light of main emergent ray generation ± Δ θ with the diffraction surfaces of ring grain micro-structural, and described Δ θ is in 2 °～8 ° scopes.
Further, described ring grain micro-structural is the periodic ring grain micro-structural of waveform, and its Wave crest and wave trough value H is 1～25 micron, and the spacing P of ring grain is 0.02～5 millimeter.
Further, described light distribution curved surface for continuously smooth curved surface, have the mixed light effect the ring grain diffraction surfaces, have the mixed light effect squamation shape polyhedron curved surface, have the ring grain compound curved surface, cellular polyhedron curved surface, Fresnel curved surface, quadrangle mixing free form surface, hexagon mixing free form surface, polygon mixing free form surface or the nonaxisymmetrical free form surface that are formed by mini line segment and curve with the different mixing free form surface of cellular composite surface, X and Y-direction section profile, section profile line of mixed light effect.
Further, described light distribution curved surface by in the different mixing free form surface of quadrangle mixing free form surface, hexagon mixing free form surface, polygon mixing free form surface, cellular polyhedron curved surface, Fresnel curved surface, squamation shape curved surface, X and Y-direction section profile at least two kinds be composited.
Further, described caustic surface is Fresnel ring grain caustic surface, aspheric surface caustic surface or free form surface.
Further, be attached with translucent resin or colloid on the described reflecting surface, perhaps be attached with opaque medium.
Further, described reflecting surface applies reflectance coating or pastes reflective sheet.
Further, described optical filter is translucent optical filter or nontransparent optical filter.
Further, described bottom surface is taper seat, frosting or the prism of corner cube array of structures face of 90 degree V-shaped groove ring grain faces, tetragonal pyramid pyramid prism array face, hexagonal array.
A kind of LED lens devices for the LCD backlight system comprises led light source, optical filter and described secondary optical lens, and described optical filter is fixed on the described step, and described led light source is positioned at described inner groovy.
Further, described optical filter and described secondary optical lens are combined into one.
A kind of LCD backlight system comprises described LED lens devices.
Further, described LED lens devices has one or more.
A kind of illuminator comprises described LED lens devices.
The invention has the beneficial effects as follows: the present invention proposes the secondary optical lens of a kind of LED, adopt the method for refraction and total reflection combination, can further shorten the distance between LED substrate and the lcd screen, greatly reduce the thickness of back light system, its depth-width ratio can be accomplished below 0.15.
Description of drawings
Fig. 1 is the profile of LED lens devices first specific embodiment;
Fig. 2 a～2e is respectively front view, top view, right view, upward view and the stereogram of first specific embodiment;
Fig. 3 is the design principle figure of first specific embodiment;
Fig. 4 is that the light distribution curved surface of secondary optical lens of first specific embodiment is to the luminous intensity distribution schematic diagram of single light;
Fig. 5 is the three-dimensional model diagram of first specific embodiment;
Fig. 6 a, 6b are the ray tracing figure of first specific embodiment;
Fig. 7 is the illumination contour distribution map of first specific embodiment on the lcd screen of distance L ED substrate 15mm;
Fig. 8 is the candela rectangular co-ordinate distribution map (distribution curve flux) of first specific embodiment;
Fig. 9 is the candela polar coordinates distribution map (distribution curve flux) of first specific embodiment;
Figure 10 a, 10b are the ray tracing figure of backlight module of the 6*6 array of first specific embodiment, and wherein, the LED spacing is 12mm, and lcd screen is 15mm from the distance of pcb board, and this ray tracing only demonstrates the light that is mapped on the screen;
Figure 11 is 6 * 6 arrays of first specific embodiment, and the LED spacing is 120mm, when lcd screen is 15mm to the distance of pcb board, and the Illumination Distribution contour map on the screen;
Figure 12 is the design principle figure of second specific embodiment of LED lens devices;
Figure 13 is the candela rectangular co-ordinate distribution map of second specific embodiment;
Figure 14 is the candela polar coordinates distribution map of second specific embodiment;
Figure 15 is the profile of the 3rd specific embodiment of LED lens devices;
Figure 16 is the design principle figure of the 3rd specific embodiment;
Figure 17 is the design principle figure of the 4th specific embodiment of LED lens devices;
Figure 18 a～18e is respectively front view, top view, right view, upward view and the stereogram of the 4th specific embodiment;
Figure 19 a～19e is respectively front view, top view, right view, upward view and the stereogram of the 5th specific embodiment of LED lens devices;
Figure 20 is the mixed light schematic diagram of the 5th specific embodiment of LED lens devices;
Figure 21 a, 21b are respectively profile and the upward views of the 6th specific embodiment of LED lens devices;
Figure 22 a, 22b are respectively profile and the upward views of the 7th specific embodiment of LED lens devices;
Figure 23 a～23d is respectively the poplar view of the secondary optical lens of the 8th～11 specific embodiment.
The specific embodiment
By reference to the accompanying drawings the present invention is described in further detail below by the specific embodiment.
First specific embodiment of LED lens devices involved in the present invention, the profile of this lens devices as shown in Figure 1, the front view of the lens that this embodiment is related, stereogram, top view, right view and upward view are as shown in Figure 2.This lens devices comprises led light source, secondary optical lens 1 and optical filter 2.Being characterized as of described secondary optical lens 1: the lens below is equipped with an inner groovy near the interposition of led light source, and the side 11 of inner groovy is the circular arc surface of revolution (being that its hatching is circular arc), and the end face 13 of inner groovy is an aspheric surface caustic surface; There is a cylindrical bump lens top, and the interposition of projection is equipped with a conical reflecting surface 14 toward lower recess, is useful on the step 16 of placing optical filter on it, and the lateral surface 15 of projection is for there being a little the cylindrical curved surface as exiting surface of a gradient; The side, outer ring 12 of secondary optical lens also is exiting surface, and it plays the luminous intensity distribution effect, and it is continuously smooth curved surface; The bottom surface 17 of secondary optical lens is Non-optical surfaces, and the miniature prism of corner cube face 18 of retro-reflection that is used for collecting veiling glare according to hexagonal array is arranged above it.The card base 19 that is used for fixing can also be arranged at the bottom of secondary optical lens in addition, and it is used for these lens are fixed on the circuit board of LED.The optical filter 2 of the lighting device of described LED, it is positioned in the step 16 of lens tops cylindrical bump, and it can be the translucent film of milky, and the perhaps diffusion sheet of frosted finish effect perhaps also can be the sheet material of coating and coating.The LED that the lighting device of described LED uses, it can be the LED of various lambert's shapes distributions.
The reflection mode of the surface of emission can be total reflection, non-total reflection or part total reflection.The lateral surface of projection is cylindrical curved surface, and this cylindrical curved surface can be just circle or non-just round sweep surface, and its a kind of shape is cylindrical surface or with the cylindrical surface of pattern draft.Reflecting surface can be coned face, with the conical surface of Fresnel line, the compound conical surface of ring grain that the section profile line is comprised of mini line segment and curve, four sides taper surface, polyhedral cone shaped or by coned face and polyhedral cone shaped compound the composition.
Light distribution curved surface can be the sliding curved surface of continuous light, ring grain diffraction surfaces with mixed light effect, squamation shape polyhedron curved surface with mixed light effect, have the mixed light effect with cellular composite surface, the mixing free form surface that X and Y-direction section profile are different, the ring grain compound curved surface that the section profile line is comprised of mini line segment and curve, cellular polyhedron curved surface, the Fresnel curved surface, quadrangle mixing free form surface, hexagon mixing free form surface, polygon mixing free form surface or nonaxisymmetrical free form surface.
Light distribution curved surface also can by in the different mixing free form surface of quadrangle mixing free form surface, hexagon mixing free form surface, polygon mixing free form surface, cellular polyhedron curved surface, Fresnel curved surface, squamation shape curved surface, X and Y-direction section profile at least two kinds be composited.
Caustic surface can be Fresnel ring grain caustic surface, aspheric surface caustic surface or free form surface.
Can be attached with translucent resin or colloid on the reflecting surface, perhaps be attached with opaque medium.
Reflecting surface can apply reflectance coating or paste reflective sheet.
Optical filter can be translucent optical filter or nontransparent optical filter.
Fig. 3 is the design principle figure of first specific embodiment.Light from led light source light-emitting area central point O ejaculation, the light of intermediate portion is assembled by aspheric end face 13, on the conical fully reflecting surface 14 of its top of directive, the light after the reflection penetrates by cylindrical outer side face 15 after assembling, and all emergent raies and optical axis OZ are θ
MaxThe angle, θ
MaxBetween 85 °～90 °, be preferably 85 ° here.In order to make things convenient for injection moulding, the lateral surface top of cylindrical outer side face 15 is slightly thin, bottom is slightly thick, and some pattern drafts are arranged a little, and the withdrawing pattern oblique angle is preferably 2 ° here between 1 °～5 °.Be left from the light of the lateral parts of led light source light-emitting area center O point ejaculation, through inciding on the light distribution curved surface 12 in the lens outside after side 11 refractions for the circular arc surface of revolution, from the light of light distribution curved surface 12 outgoing, from top to bottom, the angle of itself and optical axis OZ is evenly distributed in respectively 0～θ
MaxBetween the angle, θ
MaxBetween 85 °～90 °, also be preferably 85 ° here.Described is the side 11 of the circular arc surface of revolution, and its hatching is circular arc, and its all normals all intersect at the N point, and the summit P of N point and circular arc is in same level.When fluorescent powder coated of LED is larger, having some light spills from the taper seat fully reflecting surface 14 at lens top, in the outgoing hot spot, form the ring of light, here placed above it a tablet filter 2, it is used for veiling glare is broken up for translucent milky film or with the diffusion sheet of frosted, eliminates the ring of light, also can stop veiling glare and eliminate the ring of light by plated film or applying coating on the taper seat reflecting surface at lens top, make the distribution of the larger uniform light of formation scope.In addition, when fluorescent powder coated of LED is larger, also can by the below reflection of light distribution curved surface 12 toward lens, therefore design the retro-reflection face according to the miniature micro-prism array of hexagonal array here in the lens bottom surface by some veiling glare, be used for collecting veiling glare, and reflect toward the top of lens.
Fig. 4 is the luminous intensity distribution figure of 12 couples of single light QR of light distribution curved surface, and its light distribution angle (angle of emergent ray and optical axis OZ) satisfies following tangent condition:
(X, Y) coordinate figure of the outline line of light distribution curved surface 12 is calculated by iterative Integral Method according to above-mentioned formula.13 of optically focused end faces can be by imaging design software optimization.To calculate and optimize the three-dimensional entity model of each curved surface composition secondary optical lens out, as shown in Figure 5.
The three-dimensional entity model of the secondary optical lens of this specific embodiment is input to carries out ray tracing and computer simulation in the photometric analysis software.The model of supposing led light source is the Luxeon Rebel White Display LED of PHILIPS Co., luminous flux is 90 lumens, the height of the lcd screen distance L ED substrate of required illumination is 15mm, the optical characteristics of the optical filter 2 of lens top is scattering white (Diffuse White), can reach according to the light and shade in the middle of the hot spot on the screen transparency and the frosted degree of the situation adjusting the optical filter whether ring of light is arranged in the reality.Fig. 6 is the ray tracing figure of first specific embodiment.Fig. 7 is the illuminance contour distribution map on the screen, can see that the diameter range of glossing up has surpassed 200mm.The far field angle distribution (distribution curve flux) of the light intensity of first specific embodiment, such as Fig. 8 and shown in Figure 9, Fig. 8 is candela rectangular co-ordinate distribution map, Fig. 9 is candela polar coordinates distribution maps, can find out that most of light distribution is between ± 75 °～± 90 °, the position of its largest light intensity value is about ± 85 °, mid portion ± 65 are ° lower and level and smooth with interior light intensity value, its value is about 3.5% of largest light intensity value, and this part light is mainly used to throw light on the screen over against the position of LED top.
Figure 10 is the ray tracing figure of backlight module of 6 * 6 arrays of first specific embodiment, and the LED spacing is 120mm, and the lcd screen of required illumination is 15mm from the distance of pcb board, only shows the light that is mapped on the screen here.Less black lines is the light that penetrates from secondary optical lens among the figure, and the luminous intensity distribution of this lens area just above is penetrated next light from its adjacent lens devices, thereby makes the irradiation that reaches uniform-illumination.Figure 11 is the Illumination Distribution contour map on the screen, and the maximum that can find out Illumination Distribution is 6500Lux (lux) approximately, and the minimum of Illumination Distribution is about 5500Lux, and the uniformity that can get the Illumination Distribution on the screen is about:
Figure 10 is the ray tracing figure of backlight module of 6 * 6 arrays of first specific embodiment, and the LED spacing is 120mm, and screen is 15mm from the distance of pcb board, and this ray tracing figure only demonstrates the light that is mapped on the screen.
Second specific embodiment:
In second specific embodiment, except the light distribution curved surface 122 of secondary optical lens lateral surface and first specific embodiment were different, other structures were all basic identical with first specific embodiment.The design principle of second specific embodiment as shown in figure 12, its all through output light of light distribution curved surface 122 luminous intensity distributions, the angle of itself and optical axis all is θ
Max, and in the specific embodiment through the output light of light distribution curved surface 12 luminous intensity distributions, the angle of itself and optical axis OZ is evenly distributed in 0～θ
MaxBetween the angle, θ here
MaxAlso be preferably 85 °.In shape, the curved surface 122 of second specific embodiment is more flat, locates to appear to have an arcwall face that is similar to fillet and the light distribution curved surface 12 of first specific embodiment and lens top cylindrical outer side face 15 is connected.
Second specific embodiment has wider range of exposures than first specific embodiment, and when the LED spacing was 150mm, the Illumination Distribution uniformity on the high lcd screen of distance P CB plate 15mm can surpass 80%.The far field angle of the light intensity of second specific embodiment distributes (distribution curve flux) such as Figure 13 and shown in Figure 14, Figure 13 is that the candela rectangular co-ordinate distributes, Figure 14 is that the candela polar coordinates distribute, can find out that most of light distribution is between ± 75 °～± 90 °, the position of its largest light intensity value is about ± 85 °, centre ± 65 ° of scopes are lower than first specific embodiment with interior light intensity value, and the light intensity value of Partial angle is close to 0.
The 3rd specific embodiment:
The 3rd specific embodiment of secondary optical lens involved in the present invention, its profile as shown in figure 15.Different from first specific embodiment is, the lens below is near the side 113 of the female parts in the centre position of LED, and it is the conical surface.Other methods for designing of several are then identical with first specific embodiment, and the end face 133 that comprises indent is an aspheric surface caustic surface; There is a cylindrical bump lens top, and the interposition of projection is equipped with a conical fully reflecting surface 143 toward lower recess, is useful on the step 163 of placing optical filter on it, and the lateral surface 153 of projection is for there being a little the cylindrical exiting surface of a gradient; The side, outer ring 123 of lens also is exiting surface, and it plays the luminous intensity distribution effect, and it is continuously smooth curved surface; The bottom surface 173 of lens is Non-optical surfaces, and the miniature prism of corner cube face 183 of retro-reflection collected veiling glare etc. that is used for according to hexagonal array is arranged above it.The card base 193 that is used for fixing can also be arranged at the bottom of lens in addition, and it is used for lens are fixed on the circuit board of LED.The optical filter 2 of the lighting device of described LED, it is positioned in the step 163 of lens tops cylindrical bump, and it can be the translucent film of milky, and the perhaps diffusion sheet of frosted finish effect perhaps also can be the sheet material of coating and coating.The LED that described Optical devices use, it can be the LED of various lambert's shapes distributions.
The design principle of the 3rd specific embodiment and the specific embodiment 1 are similar.As shown in figure 16, from the light that led chip light-emitting area central point O penetrates, the light of intermediate portion is assembled by aspheric surface end face 133, assembles on the taper fully reflecting surface 143 of its top of rear directive, light after the reflection penetrates by cylindrical outer side face 153, and all emergent raies and optical axis OZ are θ
MaxThe angle, θ
MaxBetween 85 °～90 °, be preferably 85 ° here.In order to make things convenient for injection moulding, the top of cylindrical outer side face 153 is slightly thin, bottom is slightly thick, and some pattern drafts are arranged a little, and the withdrawing pattern oblique angle is preferably 2 ° here between 1 °～5 °.Be left from the light of the lateral parts of led chip light-emitting area center O point ejaculation, through inciding on the light distribution curved surface 123 in the lens outside after tapered side 113 refractions, from the light of light distribution curved surface 123 outgoing, from top to bottom, the angle of itself and optical axis OZ is evenly distributed in 0～θ
MaxBetween the angle, θ
MaxBetween 85 °～90 °, also be preferably 85 ° here.
The 4th specific embodiment:
Fluorescent powder coated on led light source must be rarer, when surface covered is relatively large, adopt the described secondary optical lens of the first～three specific embodiment that the LED emergent light is carried out luminous intensity distribution, because light distribution angle is very large, might can produce the inconsistent situation that colour temperature is high, hot spot edge colour temperature is low in the middle of the hot spot at screen, thereby cause the color uniformity of lcd screen bad.The 4th specific embodiment of the present invention has proposed the solution for this situation.
The profile of the 4th specific embodiment as shown in figure 17, except the curved surface 124 in the outside, other all feature is all the same with first specific embodiment, here the light distribution curved surface 124 in the outside is designed to have the diffraction surfaces of ring grain micro-structural, make emergent light center on the low-angle mixed light of main emergent ray QR generation ± Δ θ, can improve the difference of colour temperature.Δ θ is preferably 3 ° here in 2 °～5 ° scopes in general.Ring grain micro-structural described here is preferably the periodic ring grain micro-structural of waveform, and its Wave crest and wave trough value H is 8 microns, and the spacing P of ring grain is 0.5 millimeter.Described chief ray QR, its light distribution angle (angle of emergent ray and optical axis OZ) also satisfy following tangent condition:
Adding described ring grain micro-structural in outside light distribution curved surface 124, it can produce approximately ± 3 ° mixed light, thus solve the different problem of color temperature difference on the LCD panel.Described the 4th specific embodiment, the light distribution curved surface in the outside are except corrugated ring grain diffraction surfaces, and the ring grain face that it can also be comprised of small straightway for the section profile line also can play the light mixing effect in the good low-angle.
Figure 18 is the 3-D view of related the 4th specific embodiment, and the bottom surface 174 of lens is also with the prism of corner cube type retro-reflection micro-structural face 184 that is used for collecting veiling glare, and the outer N-Side surf 124 of lens is the diffraction surfaces of ring grain micro-structural.
The 5th specific embodiment:
In addition, for the light mixing method that might can produce at screen the inconsistent situation that the middle colour temperature of hot spot is high, hot spot edge colour temperature is low, except the method that adopts the 4th specific embodiment, lateral layout can also be become the polyhedral method of flakey, carry out the mixed light in the low-angle.Figure 19 is front view, stereogram, top view, right view and the upward view of this specific embodiment.Except the light distribution curved surface 125 in the outside was flakey polyhedron according to hexagonal array, the design of other curved surfaces was all identical with first specific embodiment among the figure.
Figure 20 is the mixed light schematic diagram of the 5th specific embodiment, and Q1Q2 is the section profile line of one of them scale, and light is through the central point Q of this scale, and the light distribution angle of output light is followed the light distributing method of first specific embodiment or second specific embodiment.Because related scale is the plane, light is through upper lower limb Q1 and the Q2 of scale, and it has a very little angle of divergence ± Δ θ around chief ray QR, and it can play with adjacent scale divergent beams out the effect of mixed light.Here the size of preferred each scale makes itself and the section profile line of first specific embodiment be about 8 microns the rise of corresponding position is poor, thus the mixed light that produces approximately ± 3 °, thus the different problem of color temperature difference on the solution LCD panel.
The other described flakey polyhedron of present embodiment light distribution curved surface 125, it can also be the flakey polyhedron of arranging according to quadrangle or other shapes.
The 6th specific embodiment:
The secondary optical lens of LED lens devices involved in the present invention, its lens below can also be designed to Fresnel (Fresnel) ring grain caustic surface near the end face of the indent in the centre position of led light source.
Figure 21 is profile and the upward view of described the 6th specific embodiment, aspherical condenser with the female parts top in first specific embodiment among the figure has become the Fresnel lens, the effect of playing equally optically focused of optics aspect itself and aspherical condenser, and configuration aspects its can reduce the space of lens, thereby adopt smaller that this structure can be with the size design of lens.
The 7th specific embodiment:
The secondary optical lens of LED lens devices involved in the present invention, the object of filling or setting and lens different optical characteristic on the reflecting surface of other method indent in the middle of above its lens, this object can be resin or the colloid of semi-transparent shape, also can be the object with coating or coating, or opaque object.
Figure 22 is profile and the upward view of described the 7th specific embodiment, among the figure with in first specific embodiment, diffusion sheet on the reflecting surface of lens top becomes the filling object, can realize equally stopping the function of veiling glare and the elimination ring of light, thereby make the distribution of the larger uniform illumination of formation scope.
Other specific embodiment:
The Optical devices of the described LED-backlit system that shows for large-screen lc, the bottom of its described secondary optical lens is Non-optical surfaces, it can be any surface, the above can do any processing, comprises common machine machined surface, frosting, is used for retro-reflection micro-structural face of collecting veiling glare etc.
The bottom surface that Figure 23 a～23d is respectively secondary optical lens is taper seat 189 and the frosting 1810 of miniature 90 degree V-flute profile ring grain faces 187, miniature 4 sides cone pyramid prism array face 188, miniature 6 limit shapes arrangements, the specific embodiment eight, nine, ten bottom surfaces all are miniature prism of corner cube array of structures face among the figure, and it can reflect back into the light that incides the lens bottom surface lens the place ahead.The bottom surface of the secondary optical lens of the specific embodiment 11 is frosting, and its veiling glare with directive lens rear is broken up, and partly is reflected back the place ahead of lens, if the lacquer of coated white above it, the effect of then collecting veiling glare can be better.
The present invention relates to a kind of Optical devices of the LED-backlit system that shows for large-screen lc, its characteristics are comprised of led light source, secondary optical lens and optical filter for this device.The secondary optical lens of described device, it is characterized by: the lens below is equipped with an inner groovy near the interposition of LED, the side of inner groovy is the circular arc surface of revolution or the conical surface of revolution, and the end face of indent is an aspheric surface or is Fresnel (Fresnel) caustic surface; There is a cylindrical bump lens top, and the interposition of projection is equipped with a conical fully reflecting surface toward lower recess, is useful on the step of placing optical filter on it, and the lateral surface of projection is for there being a little the cylindrical exiting surface of a gradient; The side, outer ring of lens also is exiting surface, and it is light distribution curved surface, and it can be the curved surface that continuous light is sliding, can or be polyhedron scale face for the ring grain face that is comprised of small straightway with the ring grain diffraction surfaces of mixed light effect, section profile line a little also; The bottom surface of lens is Non-optical surfaces, and it can be any surface, and the above can do any processing, comprises common machine machined surface, frosting, is used for retro-reflection micro-structural face of collecting veiling glare etc.The card base that is used for fixing can also be arranged at the bottom of lens in addition, different shapes, size can be arranged as required, reach the position, is used for lens are fixed on the circuit board of LED.The optical filter of the lighting device of described LED, it is positioned in the step of lens top cylindrical bump, and it can be the translucent film of milky, the perhaps diffusion sheet of frosted finish effect, perhaps have the optical filter with the site, perhaps also can be the sheet material of coating and coating.The LED that the lighting device of described LED uses, it can be the LED of various lambert's shapes distributions.
The secondary optical lens below can be the circular arc surface of revolution near the side 11 of the indent of LED, and its hatching is circular arc, and its all normals all intersect at the N point, and the summit P of N point and circular arc line is in same level.
The design principle of secondary optical lens can for, light from led chip light-emitting area central point O ejaculation, the light of intermediate portion is assembled by aspheric surface end face 13, assemble on the taper fully reflecting surface 14 of its top of rear directive, light after the reflection penetrates by cylindrical outer side face 15, and all emergent raies and optical axis OZ are θ
MaxThe angle, θ
MaxBetween 85 °～90 °.In order to make things convenient for injection moulding, the top of cylindrical outer side face 15 is slightly thin, bottom is slightly thick, and some pattern drafts are arranged a little, and the withdrawing pattern oblique angle is between 1 °～5 °.Be left from the light of the lateral parts of led chip light-emitting area center O point ejaculation, through inciding on the light distribution curved surface 12 in the lens outside after side 11 refractions for the arc surface of revolution, from the light of light distribution curved surface 12 outgoing, from top to bottom, the angle of itself and optical axis OZ is evenly distributed in 0～θ
MaxBetween the angle, θ
MaxBetween 85 °～90 °.The light distributing method of 12 couples of single light QR of outside light distribution curved surface, its light distribution angle (angle of emergent ray and optical axis OZ) satisfies following tangent condition:
The optical characteristics of the optical filter 2 of secondary optical lens top can reach according to the light and shade in the middle of the hot spot of reality transparency and the frosted degree of the luminous intensity distribution situation adjusting the optical filter whether ring of light is arranged, it also can be the optical filter with the site, or the sheet material of coating and coating.
The interposition of secondary optical lens top projection is equipped with the conical fully reflecting surface of one past lower recess, the reflecting surface of this indent also can be cambered surface or plane, also can with one or more layers reflected coat layer or coating, also can be the micro-structural with site or ring grain on its reflecting surface.
Described lens devices, its all through output light of light distribution curved surface 122 luminous intensity distributions, the angle of itself and optical axis can all be θ also
Max
Described lens devices, its secondary optical lens below also can be taper seat near the side 113 of the female parts in the centre position of LED.
Described lens devices, being directed to must be rarer when the fluorescent powder coated of led chip, when surface covered is relatively large, because light distribution angle is very large, might can produce the inconsistent situation that colour temperature is high, hot spot edge colour temperature is low in the middle of the hot spot at screen.For this situation, the outside light distribution curved surface 124 of described secondary optical lens can be designed to the diffraction surfaces with the ring grain micro-structural, make emergent light center on the low-angle mixed light of main emergent ray QR generation ± Δ θ, can improve the difference of colour temperature, Δ θ is in 2 °～5 ° scopes.
Described lens devices, the inconsistent situation high for colour temperature in the middle of the hot spot, that hot spot edge colour temperature is low can be designed to the outside light distribution curved surface 124 of described secondary optical lens the ring grain face that the section profile line is comprised of small straightway.
Described lens devices, the inconsistent situation high for colour temperature in the middle of the hot spot, that hot spot edge colour temperature is low, the light distribution curved surface 125 in the lens outside can be designed to the polyhedral light distribution curved surface of flakey, it can also be the flakey polyhedron of arranging according to quadrangle or other shapes, light is through edge Q1 and the Q2 of scale, it has a very little angle of divergence ± Δ θ around chief ray QR, and it can play with adjacent scale diverging light out the effect of mixed light.
Described lens devices, its secondary optical lens below can also be Fresnel (Fresnel) ring grain caustic surface near the end face of the indent of LED.The effect of playing equally optically focused of itself and aspherical condenser, and configuration aspects its can reduce the space of lens, thereby adopt smaller that this structure can be with Lens Design.
Described lens devices, the Optical devices of this LED-backlit system are applied on the backlight illuminating system, can arrange for different spacing, also can be with single or many s' different modes spread configuration.
Described lens devices can be applied on the illuminator except LCD backlight.
Described lens devices, the Optical devices of this LED-backlit system are applied on the backlight illuminating system, and the luminous intensity distribution of irradiation area is from the light that is adjacent the lens devices ejaculation directly over its lens.
Described lens devices, its secondary optical lens 1 can be the integrated combined type setting with the optical filter 2 of its top, also can be split type setting.
Described lens devices, its secondary optical lens 1 also can make up or be molded into one for the material of two kinds of different optical characteristics with the optical filter 2 of its top.
Described lens devices, the bottom surface of its secondary optical lens are Non-optical surfaces, and it can be for common machine machined surface, frosting, be used for retro-reflection micro-structural face of collecting veiling glare etc.Described interflection micro-structural face, it can be the taper seat 189 of miniature 90 degree V-grooved ring line faces 187, miniature 4 sides cone pyramid prism array face 188, miniature 6 limit shapes arrangements, it can reflect back into the light that incides the lens bottom surface lens the place ahead.Described frosting, it can be broken up the veiling glare at directive lens rear, and part is reflected back the place ahead of lens, the lacquer of all right coated white on the frosting.
Above content is in conjunction with concrete embodiment further description made for the present invention, can not assert that implementation of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (23)
1. secondary optical lens, the light distribution curved surface that comprises the bottom surface and upwards arch upward and form from the edge of described bottom surface, it is characterized in that: the middle part at described light distribution curved surface top formation projection protruding upward, the lateral surface of described projection is the cylindrical curved surface as exiting surface, the middle part of described convex top is the recessed reflecting surface that forms downwards, be provided with step in the described reflecting surface, from the middle part of described bottom surface to being recessed on the formation inner groovy, described inner groovy has the side and is positioned at the caustic surface of described side top, described side is the surface of revolution, after a part that makes incident ray is assembled by described caustic surface, the described reflecting surface of directive, the light after the reflection is by the lateral surface outgoing of described projection; Another part of described incident ray is after the refraction of the side of described inner groovy, through described light distribution curved surface outgoing.
2. secondary optical lens as claimed in claim 1, it is characterized in that: the side of described inner groovy is the circular arc surface of revolution, the hatching of the described circular arc surface of revolution is circular arc, and all normals of described circular arc all intersect at the N point, and the summit P of described N point and circular arc is in same level.
3. secondary optical lens as claimed in claim 1 is characterized in that: the side of described inner groovy is that the circular arc surface of revolution, section are non-just round surface of revolution or the conical surface.
4. secondary optical lens as claimed in claim 1 is characterized in that: the cylindrical curved surface of described projection is just circle or non-just round sweep surface.
5. secondary optical lens as claimed in claim 1 is characterized in that: described reflecting surface is coned face, with the conical surface of Fresnel line, the compound conical surface of ring grain that the section profile line is comprised of mini line segment and curve, four sides taper surface, polyhedral cone shaped or by coned face and polyhedral cone shaped compound the composition.
6. secondary optical lens as claimed in claim 1, it is characterized in that: the reflection mode of described reflecting surface is total reflection, non-total reflection or part total reflection.
7. secondary optical lens as claimed in claim 1 is characterized in that: the side of described inner groovy and the transition of caustic surface wedge angle or arc transition.
8. secondary optical lens as claimed in claim 1 is characterized in that: described light distribution curved surface makes emergent light center on the low-angle mixed light of main emergent ray generation ± Δ θ with the diffraction surfaces of ring grain micro-structural, and described Δ θ is in 2 °～8 ° scopes.
9. secondary optical lens as claimed in claim 5, it is characterized in that: described ring grain micro-structural is the periodic ring grain micro-structural of waveform, and its Wave crest and wave trough value H is 1～25 micron, and the spacing P of ring grain is 0.02～5 millimeter.
10. secondary optical lens as claimed in claim 1 is characterized in that: described light distribution curved surface is continuous smooth curved surface, ring grain diffraction surfaces with mixed light effect, squamation shape polyhedron curved surface with mixed light effect, have the mixed light effect with cellular composite surface, the mixing free form surface that X and Y-direction section profile are different, the ring grain compound curved surface that the section profile line is comprised of mini line segment and curve, cellular polyhedron curved surface, the Fresnel curved surface, quadrangle mixing free form surface, hexagon mixing free form surface, polygon mixing free form surface or nonaxisymmetrical free form surface.
11. secondary optical lens as claimed in claim 1 is characterized in that: described light distribution curved surface by in the different mixing free form surface of quadrangle mixing free form surface, hexagon mixing free form surface, polygon mixing free form surface, cellular polyhedron curved surface, Fresnel curved surface, squamation shape curved surface, X and Y-direction section profile at least two kinds be composited.
12. secondary optical lens as claimed in claim 1 is characterized in that: described caustic surface is Fresnel ring grain caustic surface, aspheric surface caustic surface or free form surface.
13. secondary optical lens as claimed in claim 1 is characterized in that: be attached with translucent resin or colloid on the described reflecting surface, perhaps be attached with opaque medium.
14. secondary optical lens as claimed in claim 1 is characterized in that: described reflecting surface applies reflectance coating or pastes reflective sheet.
15. secondary optical lens as claimed in claim 1 is characterized in that: described optical filter is translucent optical filter or nontransparent optical filter.
16. secondary optical lens as claimed in claim 15 is characterized in that: described optical filter is plating or pastes optical filtering film, light-shielding film, reflective membrane, light polarizing film and light guiding film.
17. secondary optical lens as claimed in claim 15 is characterized in that: its surface of described optical filter can be the printing optical site and prints various light modulation patterns, or with laser engraving optics site and various light modulation pattern.
18. secondary optical lens as claimed in claim 1 is characterized in that: described bottom surface is taper seat, frosting or the prism of corner cube array of structures face of 90 degree V-shaped groove ring grain faces, tetragonal pyramid pyramid prism array face, hexagonal array.
19. LED lens devices that is used for the LCD backlight system, comprise led light source, it is characterized in that: also comprise the described secondary optical lens of any one among optical filter and the claim 1-16, described optical filter is fixed on the described step, and described led light source is positioned at described inner groovy.
20. LED lens devices as claimed in claim 19 is characterized in that: described optical filter and described secondary optical lens are combined into one, and also can be split.
21. a LCD backlight system is characterized in that: comprise the described LED lens devices of claim 20.
22. LCD backlight as claimed in claim 21 system, it is characterized in that: described LED lens devices has one or more.
23. an illuminator is characterized in that: comprise the described LED lens devices of claim 20.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210086784.5A CN103322505B (en) | 2012-03-19 | Secondary optical lens for liquid crystal display backlight system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210086784.5A CN103322505B (en) | 2012-03-19 | Secondary optical lens for liquid crystal display backlight system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103322505A true CN103322505A (en) | 2013-09-25 |
| CN103322505B CN103322505B (en) | 2016-11-30 |
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| CN104155745A (en) * | 2014-08-28 | 2014-11-19 | 烟台纳威给申莱茨电子科技有限公司 | Light-emitting lens for beacon light |
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| CN106568051A (en) * | 2016-11-15 | 2017-04-19 | 王赟 | LED distance light module structure |
| CN106594675A (en) * | 2017-01-04 | 2017-04-26 | 上海小糸车灯有限公司 | LED total-reflection lens and LED line source |
| CN106594675B (en) * | 2017-01-04 | 2023-03-31 | 华域视觉科技(上海)有限公司 | LED total reflection lens and LED line light source |
| WO2018214611A1 (en) * | 2017-05-22 | 2018-11-29 | 青岛海信电器股份有限公司 | Backlight module and liquid crystal display device |
| CN113534391A (en) * | 2018-01-30 | 2021-10-22 | 大立光电股份有限公司 | Imaging lens with double-color molding optical element and electronic device |
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| WO2020063150A1 (en) * | 2018-09-26 | 2020-04-02 | 常州星宇车灯股份有限公司 | Condenser structure for vehicle |
| CN110160010A (en) * | 2019-04-03 | 2019-08-23 | 苏州阿奎睿思机器人科技有限公司 | Industrial lighting device |
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