CN101178515A - Straight down active mode dynamic state back light source structure based on luminous diode - Google Patents
Straight down active mode dynamic state back light source structure based on luminous diode Download PDFInfo
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Abstract
The invention discloses a run-down active form dynamic backlight source structure on basis of an LBD belonging to the LBD backlight source technique, which adopts tridimensional free surface lens to pack the LBD chip so as to limit the light sent out by each LBD in a smaller area with set shape, and adopts special LBD arrangement manner to form an even lighting distribution with a bigger area. Moreover, the invention can realize the run-down active form dynamic backlight source with various sizes by increasing or reducing LED quantity to enlarge or reduce size according to requirement. The invention solves the disadvantages that: the traditional side emission type LED backlight source has poor display quality and high power consumption. The invention is applicable for the requirements of picture quality and high dynamic range image of liquid crystal color TV with high definition in the future and can satisfy the energy-saving need of human society.
Description
Technical field
The invention belongs to the back light source in LED technical field, be particularly related to a kind of straight down active mode dynamic backlight source structure based on light emitting diode, be in order to make in the scope that light is limited at, shape is given that each LED (light emitting diode) chip sends specifically, form uniform Illumination Distribution, and by specific arrangement mode realization large-size uniform Illumination Distribution, realize that by the scattering mechanism of scattering film or scatter plate uniform luminance distributes, thereby constitute good active dynamic backlight source.
Background technology
Show the field on the plane, traditional CRT (Cathode Ray Tube, cathode-ray tube (CRT)), replaced by more and more advanced LCD (Liquid CrystalDisplay, liquid crystal display) gradually because of high radiation, high power consumption, large volume, low resolution, volume heaviness.In field of liquid crystal display, because liquid crystal itself can not be luminous, need after liquid crystal, add the white light source of illuminance distribution usually, be referred to as backlight.
At present the backlight of LCD display is main with CCFL (Cold-Cathode Florescent Lamps, cold cathode fluorescent tube) mainly, and CCFL has that line style is luminous, even, the luminous characteristics such as stable of high brightness, light source.Brightness is the important parameter in the backlight performance, and it is defined as the luminous flux in the unit area unit solid angle.Improve brightness and help making that picture color is more bright-coloured.In LCD, the light that is sent by light source will be by the LCD plate that is made of the red, green, blue pixel, but the light of CCFL also has many unwanted light components outside its peak value spectrum, and this can influence the color reproduction ability of LCD.An essential condition that realizes high color reproduction be exactly light from the LCD pixel must be narrow spectrum light.
Compare with CCFL, LED (Light-Emitting Diode, light emitting diode) have long and short little frivolous, color reproduction rate height of life-span, gamut range wide, noiseless, be not afraid of advantages such as low temperature, no mercury pollution problem, be a kind of even more ideal LCD backlight.Along with the technology of ultra-bright LED is ripe gradually, price constantly descends, and it replaces the CCFL backlight gradually, has demonstrated great potential in field of liquid crystal display.Especially should be pointed out that LED is wideer as its gamut range of backlight, the gamut range of CCFL backlight has only about 70%; NTSC (National Television Standards Committee, National Television System Committee), and use red, green, blue LED to do backlight, gamut range can reach more than the 100%NTSC.
Yet LED will be applied to the backlight field, must solve many key technical problems.One of them is the homogeneity of the luminous far-field distribution of LED and the homogeneity question of colour mixture.The index of weighing the backlight quality comprises brightness uniformity and color uniformity.According to the described brightness of preamble definition, guarantee the brightness uniformity in entire backlight source, only need guarantee in the light-emitting area of entire backlight source, the homogeneity of luminous flux in the angle of visibility scope.In backlight design, scattering mechanism is reduced to consistent lambert's scattering everywhere, gets final product so only need guarantee the homogeneity of scattering surface place Illumination Distribution.After the coloured light of different peak wavelengths realized that respectively uniform luminance distributes, the three coloured light flux ratios of regulating light source can satisfy color uniformity, realized the uniform white light light source.In sum, the key point that successfully LED is applied to backlight is to adopt certain packing forms, and the characteristics of the inhomogeneous intensity distributions of lambert's type that the luminous far-field distribution of change LED is had make its given area at LCD realize that uniform illumination distributes.
The LED packing forms that is applied to backlight at present mainly contains limit emission-type and straight-down negative.The cardinal principle of limit emission-type backlight is the horizontal outgoing of light that LED is sent, in structures such as light guide plate, realize even light, colour mixture, because the area of backlight is generally bigger, therefore the light of horizontal transmission has enough distances to realize even light and colour mixture, can guarantee brightness uniformity and color uniformity on the exit facet.For example, patent US20050001537A1 provides a kind of limit emitting structural with the reflection disk, all is mounted with a catoptron directly over each limit diversing lens, is used to reflect directly the upwards light of outgoing.Fig. 1 has described a kind of limit emission-type back light source structure 10.Light emitting diode 11 adopts 12 encapsulation of limit diversing lens, realizes the horizontal outgoing 13 of light.In back light source structure, realize mixed light, even light 14, pass through multilayer optical thin plate 15 and liquid crystal panel 16 outgoing at last.As seen from Figure 1, the light that sends of each LED can exert an influence to the bright dipping in entire backlight source.In this case, LED only plays the part of the light source role merely, passiveness provides the uniform source of light of constant luminance to LCDs, image brilliance, contrast and image quality are only controlled by LCDs, for promote image contrast, image quality GTG level distributes and does not further help, no matter and presentation content how to change, backlight institute consumed power is changeless, therefore, there is the big shortcoming of energy loss in emission-type backlight in limit.
Then there is not above-mentioned shortcoming in direct-light-type backlight, and its cardinal principle is to allow each light emitting diode only be responsible for illumination than the zonule on the liquid crystal board, and can not exert an influence to other zones.Its main method is the special optical system of design, and the optical convergence that each light emitting diode is sent arrives given zone.The more important thing is that the straight-down negative encapsulating structure can be realized active dynamic backlight source.
The whole brightness backlight of active dynamic backlight source is along with picture material is individually carried out brightness regulation, and active dynamic backlight source is not a constant luminance uniform source of light, but an active dynamic backlight of regulating with picture material.This pattern can effectively solve liquid crystal panel darkroom light leak problem, significantly promotes the image dynamic contrast, promptly just closes the corresponding light source in this place fully in the place that does not need to show, makes this part zone almost not have illumination, forms dark space completely.Even view and admire picture materials such as the starry sky night scene at night or pyrotechnics like this, the background of black still can be kept enough black dull senses.Active dynamic LED backlight module pattern is under the target of minimise power consumption, expection can effectively reduce LED power consumption 30-50% above (view is decided as content), the average power consumption of active dynamic LED backlight module will be lower than traditional C CFL backlight module, reach the effect of power and energy saving, also can effectively reduce simultaneously the generation of LED heat, help to reduce or cancel extra heat radiation accessory, reduce the material and the manufacturing cost of whole backlight module; Power consumption reduces also will further improve LED life of product and fiduciary level.In addition, rely on active dynamic driver circuit design can further promote image picture quality, eliminate the conditions of streaking of common liquid crystals screen when showing rapid moving object, the more important thing is and to promote picture contrast, broke through to greater than 10 from 1000: 1,000: 1, satisfy following high-definition liquid crystal colour TV image quality and high dynamic range (HighDynamic Range, HDR) demand of image.
In patent US20060138437A1, mention a kind of lens that utilize the circumference symmetry of refraction mechanism, can change the far-field intensity distribution of LED, realized on a large scale evenly illumination.From its simulation result that provides, can realize that circular uniform illumination in a big way distributes, this distribution is the circumference symmetry equally.A class optical system of in patent US20060268576A1, mentioning, its whole profile is square or regular hexagon, but its effective opticator is still and curve is carried out two dimension rotation symmetry obtains, profile is cut into square or regular hexagon just for follow-up assembly unit, not in order to realize square or orthohexagonal Illumination Distribution, and because the part of optical system by artificial cutting away, can influence the even distribution of actual illumination on the contrary.Fig. 2 has described the mechanism of action of conventional two-dimensional rotation symmetric lens to light.After the light 22 that light emitting diode 21 sends reflected through lens surface 20, emergent ray 23 was still light 22 and waiting in the θ face 25 that rotation axes of symmetry 24 determines.Because be the rotation symmetric lens, each waits the process in the θ face in full accord, and therefore two dimension rotation symmetric lens can only form rotational symmetric circular Illumination Distribution.The used coordinate of this figure is a spherical coordinate system.Under this encapsulating structure, to arrange in any case, adjacent lens all can not be formed uniform Illumination Distribution with the Illumination Distribution that light source forms: perhaps the subregion overlaps, and causes this place's brightness value higher; Perhaps the subregion does not have Illumination Distribution.This will cause the decline of back light source brightness homogeneity and color homogeneity.
As seen, traditional limit emission-type structure is difficult to realize active dynamic backlight source, therefore is difficult to satisfy the demand of following high-definition liquid crystal colour TV image quality and high dynamic-range image, also is difficult to satisfy human society to energy-conservation demand.And the active dynamic backlight source that adopts conventional two-dimensional rotation symmetric lens to realize can not be given full play to the advantage of active dynamic backlight source.
Summary of the invention
The objective of the invention is to propose a kind of straight down active mode dynamic backlight source structure based on light emitting diode, this structure solves conventional two-dimensional rotation symmetric lens in the weak point that realizes on the active dynamic backlight source from principle, give full play to the advantage that light emitting diode is applied to backlight, can be approximately the light that the light emitting diode of pointolite sends is controlled in the scope of a less given shape by a kind of actual mechanism, by specific arrangement mode, form the straight down active mode dynamic backlight source of even outgoing.
A kind of straight down active mode dynamic backlight source structure based on light emitting diode comprises:
LED source: the light that is used to provide necessary wavelength and illumination;
Optical lens: can infinitely splice, have the transparent body of 3 D auto refractive surface, its effect is to make all light that light emitting diode sends after superrefraction changes direction, forms the positive 2N limit shape of N＞1 or the Illumination Distribution of rectangle or equilateral triangle;
Diffusing structure: be used for that the uniform illumination distribution is converted into uniform luminance and distribute.
Described LED source is the light emitting diode that contains different predominant wavelengths more than 1 and 1, can be approximated to be a pointolite or is used as expansion light source.
Described optical lens is the positive 2N limit shape of formation N＞1, the 3 D auto refractive surface of Illumination Distribution, and with 360 °/2N turning axle symmetry, the contained 3 D auto refractive surface of optical lens that wherein forms the rectangle Illumination Distribution is a rotational symmetry; The contained 3 D auto refractive surface of optical lens that forms the equilateral triangle Illumination Distribution is 120 ° of turning axle symmetries; Described 3 D auto refractive surface all can not be by arbitrarily angled the obtaining of one or more arbitrary curve rotation.
The curvature distribution that 3 D auto refractive surface that the optical lens of the positive 2N limit shape Illumination Distribution of described formation N＞1 is contained and the medium disc of spherical coordinate system intersect on every curve of gained is 360 a °/2N turning axle symmetry, the curvature distribution that 3 D auto refractive surface that the optical lens of described formation rectangle Illumination Distribution is contained and the medium disc of spherical coordinate system intersect on every curve of gained is a rotational symmetry, the curvature distribution that 3 D auto refractive surface that the optical lens of described formation equilateral triangle Illumination Distribution is contained and the medium disc of spherical coordinate system intersect on every curve of gained is 120 ° of turning axle symmetries, wherein the light emitting diode position is the spherical coordinate system initial point, the axis of symmetry of lens is the z axle, and the light emitting diode light direction is a z axle forward.
Described light emitting diode sends is in light in the described lens symmetrical plane, and through behind the refractive surface, its emergent ray is still in this plane.
Described light emitting diode sends is not in light in the described lens symmetrical plane, and through behind the refractive surface, the rotation axes of symmetry of its emergent ray and described lens is positioned at Different Plane; Except the light in the lens plane of symmetry, deviation also can take place during through lens refractive surfaces in other light that send from light emitting diode on the θ of spherical coordinate system direction.Wherein the light emitting diode position is the spherical coordinate system initial point, and the axis of symmetry of lens is the z axle, and the light emitting diode light direction is a z axle forward.
The vertical view shape approximation of described optical lens main body is in the Illumination Distribution of the positive 2N of its N that forms＞1 limit shape or rectangle or equilateral triangle.
The component part of described lens comprises that further L is used to place led chip and shape zone, wherein L 〉=1 arbitrarily; This zone is for placing the cavity of the light emitting diode that adopts traditional hemispherical lens encapsulation; The shape of described lens internal cavities and the shape of above-mentioned hemispherical lens match, but there is an air-gap between the two, fill with transparent material, the refractive index of described transparent material between 1.3～3.5, difference Δ n＜1.0 of the refractive index of the material of its refractive index and described lens.
Described optical lens uses transparent material processing.
After the light that described light emitting diode sends changes direction through the lens refractive surface, on scattering film or scatter plate plane, form the Illumination Distribution of definite shape.This shape comprises positive 2N limit shape or rectangle or equilateral triangle, is realized by the lens of different structure respectively.
That described lens can adopt is bonding, ultra-sonic welded, the mode that adds heat fixation or interlock are fixed on the encapsulation base plate of LED.
The arrangement mode of the lens of described encapsulation LED determined by the illumination region shape that lens form, and the arrangement mode of three lens that arrangement mode is a rectangle, the lens that form the equilateral triangle Illumination Distribution are the most adjacent that promptly forms four lens that arrangement mode is a positive 2N limit shape, the lens that form the rectangle Illumination Distribution are the most adjacent of 2N the most adjacent lens of the lens of positive 2N limit shape Illumination Distribution of N＞1 is an equilateral triangle.
The illumination zone that the arrangement mode of the lens of described encapsulation LED will make a plurality of light emitting diodes form is combined, and forms large-scale uniform illumination and distributes.The formed illumination of each lens zone can not overlap, and can partially overlap yet.
The invention has the beneficial effects as follows from principle and solve conventional two-dimensional rotation symmetric lens in the weak point that realizes on the active dynamic backlight source, give full play to the advantage that light emitting diode is applied to backlight, can be approximately the light that the light emitting diode of pointolite sends and control wide partly or entirely the concentrating in the limited scope that each light emitting diode sends by a kind of actual mechanism, by specific arrangement mode, form the straight down active mode dynamic backlight source of even outgoing.
Description of drawings
Fig. 1 is a kind of limit emission-type back light source structure synoptic diagram.
Fig. 2 conventional two-dimensional rotation symmetric lens is to the mechanism of action of light.
Fig. 3 is the lens packages structural representation of embodiment of the invention 1-equilateral triangle Illumination Distribution.
Fig. 4 is the lens packages structural representation of embodiment of the invention 2-square Illumination Distribution.
Fig. 5 is the lens packages structural representation of embodiment of the invention 3-regular hexagon Illumination Distribution.
Fig. 6 is the sectional drawing that embodiment of the invention 4-directly uses lens packages LED disclosed in this invention.
Fig. 7 is the sectional drawing that conventional encapsulated LED of embodiment of the invention 5-and lens closely cooperate and use.
Fig. 8 is conventional encapsulated LED of embodiment of the invention 6-and the non-sectional drawing that closely cooperates and use of lens.
Fig. 9 is the structural drawing of the single LEDs of the single lens packages of embodiment of the invention 7-.
Figure 10 is the structural drawing of single lens packages three LEDs of embodiment of the invention 8-.
Figure 11 is the structural drawing of single lens packages four LEDs of embodiment of the invention 9-.
Figure 12 is for adopting the backlight one-piece construction sectional drawing of the embodiment of the invention 1,2,3.
Figure 13 is the whole tomograph of the backlight that adopts the embodiment of the invention 2.
Figure 14 is the whole plan structure figure of the backlight that adopts the embodiment of the invention 1.
Figure 15 is the whole plan structure figure of the backlight that adopts the embodiment of the invention 3.
Embodiment
The present invention proposes a kind of straight down active mode dynamic backlight source structure based on light emitting diode, this structure solves conventional two-dimensional rotation symmetric lens in the weak point that realizes on the active dynamic backlight source from principle, give full play to the advantage that light emitting diode is applied to backlight, can be approximately the light that the light emitting diode of pointolite sends is controlled in the scope of a less given shape by a kind of actual mechanism, by specific arrangement mode, form the straight down active mode dynamic backlight source of even outgoing.
The present invention will be further described below by embodiment.
The lens packages structure (as shown in Figure 3) of embodiment 1-equilateral triangle Illumination Distribution
This encapsulating structure comprises light emitting diode 31 and the lens 30 that form the equilateral triangle Illumination Distribution.The packaged type of light emitting diode 31 comprises: directly use lens 30 to encapsulate; Adopt traditional hemispherical lens encapsulation earlier, cooperate with lens 30 again.Packaged type is shown in Fig. 6,7,8.Light emitting diode 31 in this encapsulating structure can be single chips, also can be multiple chips, shown in Fig. 9,10,11.The mechanism of action of 30 pairs of light of lens is described below: be positioned at the part 33 of the plane of symmetry 32 in the light that light emitting diode 31 sends, behind superrefraction, emergent ray 34 is still in face 32.Light 35 in asymmetric that light emitting diode 31 sends, behind superrefraction, emergent ray 36 is not necessarily in the plane 38 that axis of symmetry 37 and light 35 are formed.Figure 12 is the backlight one-piece construction sectional drawing of present embodiment.Light emitting diode 121 adopts lens 122 to encapsulate, and the light that light emitting diode 121 sends changes exit direction through after the refraction of lens 122, passes through multilayer optical thin plate 123 and liquid crystal panel 124 outgoing again.Figure 14 is the backlight plan structure figure of present embodiment, and light emitting diode adopts lens 141 to encapsulate, and the light that sends forms equilateral triangle Illumination Distribution 142 after reflecting through lens surface at the optical sheet place.What adopt among this embodiment is the lens that form the equilateral triangle Illumination Distribution, so arranging of adjacent lens also is equilateral triangle.The equilateral triangle Illumination Distribution 145 and 146 that adjacent lens 143 and 144 installation site make them form at the optical sheet place can be combined with Illumination Distribution 142, forms wider uniform illumination distribution.In the present embodiment, the light that the use of lens can be sent the light emitting diode of this lens packages is limited in the zone of a less given shape, therefore can realize active dynamic backlight source.
The lens packages structure (as shown in Figure 4) of embodiment 2-square Illumination Distribution
This encapsulating structure comprises light emitting diode 41 and the lens 40 that form the square Illumination Distribution.The packaged type of light emitting diode 41 comprises: directly use lens 40 to encapsulate; Adopt traditional hemispherical lens encapsulation earlier, cooperate with lens 40 again.Packaged type is shown in Fig. 6,7,8.Light emitting diode 41 in this encapsulating structure can be single chips, also can be multiple chips, shown in Fig. 9,10,11.The mechanism of action of 40 pairs of light of lens is described below: be positioned at the part 43 of the plane of symmetry 42 in the light that light emitting diode 41 sends, behind superrefraction, emergent ray 44 is still in face 42.Light 45 in asymmetric that light emitting diode 41 sends, behind superrefraction, emergent ray 46 is not necessarily in the plane 48 that axis of symmetry 47 and light 45 are formed; Figure 12 is the backlight one-piece construction sectional drawing of present embodiment; Figure 13 is the backlight tomograph of present embodiment.Light emitting diode adopts lens 131 to encapsulate, and the light that sends forms square Illumination Distribution 133 after reflecting through lens surface at optical sheet 132 places.What adopt among this embodiment is the lens that form the square Illumination Distribution, so arranging of adjacent lens also is square.The square Illumination Distribution 135 that the installation site of adjacent lens 134 makes it form at optical sheet 132 places can be combined with Illumination Distribution 133, forms wider uniform illumination and distributes.In the present embodiment, the light that the use of lens can be sent the light emitting diode of this lens packages is limited in the zone of a less given shape, therefore can realize active dynamic backlight source.
The lens packages structure (as shown in Figure 5) of embodiment 3-regular hexagon Illumination Distribution
This encapsulating structure comprises light emitting diode 51 and the lens 50 that form the regular hexagon Illumination Distribution.The packaged type of light emitting diode 51 comprises: directly use lens 50 to encapsulate; Adopt traditional hemispherical lens encapsulation earlier, cooperate with lens 50 again.Packaged type is shown in Fig. 6,7,8.Light emitting diode 51 in this encapsulating structure can be single chips, also can be multiple chips, shown in Fig. 9,10,11.The mechanism of action of 50 pairs of light of lens is described below: be positioned at the part 53 of the plane of symmetry 52 in the light that light emitting diode 51 sends, behind superrefraction, emergent ray 54 is still in face 52.Light 55 in asymmetric that light emitting diode 51 sends, behind superrefraction, emergent ray 56 is not necessarily in the plane 58 that axis of symmetry 57 and light 55 are formed; Figure 12 is the backlight one-piece construction sectional drawing of present embodiment; Figure 15 is the backlight plan structure figure of embodiment.Light emitting diode adopts lens 151 to encapsulate, and the light that sends forms regular hexagon Illumination Distribution 152 after reflecting through lens surface at the optical sheet place.What adopt among this embodiment is the lens that form the regular hexagon Illumination Distribution, so arranging of adjacent lens also is regular hexagon.The regular hexagon Illumination Distribution 154 that the installation site of adjacent lens 153 makes it form at the optical sheet place can be combined with Illumination Distribution 152, forms wider uniform illumination and distributes.In the present embodiment, the light that the use of lens can be sent the light emitting diode of this lens packages is limited in the zone of a less given shape, therefore can realize active dynamic backlight source.
Lens sizes is determined by the light emitting diode size in the foregoing description 1,2,3, and the ratio of the two is between 5: 1 to 15: 1.
Lens material employing refractive index is 1.49 PMMA material in the foregoing description 1,2,3, adopts the engraving mode to make.
Embodiment 4-directly uses lens 61 packaged LEDs disclosed in this invention, realizes the structural drawing (as shown in Figure 6) that uniform illumination distributes in the appointed area
This structure comprises lens 61 and an encapsulation base plate 62, and lens 61 are bundled on the encapsulation base plate 62.A cavity 64 that is used to place light emitting diode is arranged at lens 61 bottoms.The form of encapsulation base plate 62 is more, and wherein 63 is light emitting diodes.Light emitting diode 63 is fixed on the metal heat sink, again by bindings such as spun gold, aluminium wires.When lens 61 were bound with encapsulation base plate 62, cavity 64 was filled a kind of transparent resin.The transparent resin that cavity 64 is filled makes light-emitting diode chip for backlight unit 63 be protected, and can reduce the loss of the light extraction that the mismatch between the material refractive index of the material refractive index of light-emitting diode chip for backlight unit 63 and lens brings.The material refractive index of described transparent resin can with the material refractive index match of lens 61, also can be between the body material refractive index and lens material refractive index of light-emitting diode chip for backlight unit 63.The material refractive index of described transparent resin is between 1.3-3.5.
Embodiment 5-lens 71 disclosed by the invention cooperate with the conventional package structure is bonding, realize the structural drawing (as shown in Figure 7) that uniform illumination distributes in the appointed area
This structure comprises the disclosed lens 71 of this patent and an encapsulation base plate 72, and lens 71 are bundled on the encapsulation base plate 72.The conventional package structure contains hemispheric lens 73, and the dome-type lens 73 of the cavity shape of lens 71 and conventional package structure coincide simultaneously.Adopt the refractive index suitable resin material that the hemispherical lens 73 of the cavity of lens 71 and conventional package is bonding again, the dome-type lens material refractive index of the material refractive index of the refractive index of the resin material of bonding usefulness and lens 71 and conventional package is mated simultaneously.If the dome-type lens material refractive index of the material refractive index of lens 71 and conventional package is inconsistent, can adopt the resin material of refractive index between to come bonding.The resin material of bonding usefulness can be but be not limited to epoxy resin, silica gel etc.The resin material refractive index of bonding usefulness is between 1.3-3.5.The scioptics 71 and conventional package structure is bonding is used can make the light of light-emitting diode chip for backlight unit controlled, realize that in the appointed area uniform illumination distributes.
Embodiment 6-lens 81 disclosed by the invention and the noncontact of conventional package structure cooperate, and realize the structural drawing (as shown in Figure 8) that uniform illumination distributes in the appointed area
This structure comprises the disclosed lens 81 of this patent and an encapsulation base plate 82, and lens 81 are bundled on the encapsulation base plate 82.The conventional package structure contains hemispheric lens 83, and the cavity shape of lens 81 also is a semisphere simultaneously, but the semisphere radius of cavity is greater than the radius of the hemispherical lens 83 of conventional package.Therefore there is an air-gap 84 between the dome-type lens 83 of lens 81 and conventional package structure.The dome-type lens 83 of scioptics 81 and conventional package structure exist the noncontact of air-gap to be used, and can make the light of light-emitting diode chip for backlight unit controlled, realize that in the appointed area uniform illumination distributes.
Among structural drawing (as shown in Figure 9) the present invention of the single LEDs of the single lens packages of embodiment 7-, the packing forms of light emitting diode can be single encapsulation separately, also can be many and be packaged together., light emitting diode 91 can be monochromatic LED, also can be for adding the white light LEDs of fluorescent powder; Figure 10 is the structural drawing of single lens packages three LEDs of embodiment of the invention 8-, and light emitting diode 101,102,103 is redgreenblue LED, and the interval between each LED is approaching as far as possible under the condition that does not influence performance, and the monochromatic light of being launched can be mixed into white light.Figure 11 is the structural drawing of single lens packages four LEDs of embodiment of the invention 9-, light emitting diode 111,112,113,114 is respectively red turquoise three-color LED, also can be red, green, blue and yellow four-color LED, wherein the interval between each LED is approaching as far as possible under the condition that does not influence performance, and the monochromatic light of being launched can be mixed into white light.
What adopt in the embodiment of the invention 1,2,3 is the mode of the single chips of single lens packages.
By design, can realize arbitrary shape, arbitrarily the Illumination Distribution of size to lens surface.By specific arrangement mode the Illumination Distribution that each lens form is combined, can form wider uniform illumination and distribute, so can enlarge or minification by increasing or reduce LED quantity as required.
Lens can be made by a series of method, comprise methods such as mold injection, perfusion demoulding, diamond cutter processing.The manufacturing materials of lens is transparent, and transmissivity is had relatively high expectations.The manufacturing materials of lens can be but be not limited to polymethylmethacrylate (PMMA), polycarbonate (PC), PEI, COC etc.
Claims (13)
1. the straight down active mode dynamic backlight source structure based on light emitting diode is characterized in that, comprising:
LED source: the light that is used to provide necessary wavelength and illumination;
Optical lens: can infinitely splice, have the transparent body of 3 D auto refractive surface, its effect is to make all light that light emitting diode sends after superrefraction changes direction, forms the positive 2N limit shape of N＞1 or the Illumination Distribution of rectangle or equilateral triangle;
Diffusing structure: be used for that the uniform illumination distribution is converted into uniform luminance and distribute.
2. according to the described straight down active mode dynamic backlight source structure of claim 1 based on light emitting diode, it is characterized in that, described LED source is the light emitting diode that contains different predominant wavelengths more than 1 and 1, can be approximated to be a pointolite or is used as expansion light source.
3. according to the described straight down active mode dynamic backlight source structure of claim 1 based on light emitting diode, it is characterized in that, described optical lens is for forming the positive 2N limit shape of N＞1, the 3 D auto refractive surface of Illumination Distribution, with 360 °/2N turning axle symmetry, the contained 3 D auto refractive surface of optical lens that wherein forms the rectangle Illumination Distribution is a rotational symmetry; The contained 3 D auto refractive surface of optical lens that forms the equilateral triangle Illumination Distribution is 120 ° of turning axle symmetries; Described 3 D auto refractive surface all can not be by arbitrarily angled the obtaining of one or more arbitrary curve rotation.
4. according to the described straight down active mode dynamic backlight source structure of claim 1 based on light emitting diode, it is characterized in that, the curvature distribution that 3 D auto refractive surface that the optical lens of the positive 2N limit shape Illumination Distribution of described formation N＞1 is contained and the medium disc of spherical coordinate system intersect on every curve of gained is 360 a °/2N turning axle symmetry, the curvature distribution that 3 D auto refractive surface that the optical lens of described formation rectangle Illumination Distribution is contained and the medium disc of spherical coordinate system intersect on every curve of gained is a rotational symmetry, the curvature distribution that 3 D auto refractive surface that the optical lens of described formation equilateral triangle Illumination Distribution is contained and the medium disc of spherical coordinate system intersect on every curve of gained is 120 ° of turning axle symmetries, wherein the light emitting diode position is the spherical coordinate system initial point, the axis of symmetry of lens is the z axle, and the light emitting diode light direction is a z axle forward.
5. according to the described straight down active mode dynamic backlight source structure based on light emitting diode of claim 1, it is characterized in that described light emitting diode sends is in light in the described lens symmetrical plane, through behind the refractive surface, its emergent ray is still in this plane.
6. according to the described straight down active mode dynamic backlight source structure of claim 1 based on light emitting diode, it is characterized in that, described light emitting diode sends is not in light in the described lens symmetrical plane, through behind the refractive surface, the rotation axes of symmetry of its emergent ray and described lens is positioned at Different Plane; Except the light in the lens plane of symmetry, deviation also can take place during through lens refractive surfaces in other light that send from light emitting diode on the θ of spherical coordinate system direction.Wherein the light emitting diode position is the spherical coordinate system initial point, and the axis of symmetry of lens is the z axle, and the light emitting diode light direction is a z axle forward.
7. according to the described straight down active mode dynamic backlight source structure of claim 1, it is characterized in that the vertical view shape approximation of described optical lens main body is in the Illumination Distribution of the positive 2N of its N that forms＞1 limit shape or rectangle or equilateral triangle based on light emitting diode.
8. according to the described straight down active mode dynamic backlight source structure of claim 1, it is characterized in that the component part of described lens comprises that further L is used to place led chip and shape zone, wherein L 〉=1 arbitrarily based on light emitting diode; This zone is the cavity of the light emitting diode of the traditional hemispherical lens encapsulation of placement; The shape of described lens internal cavities and the shape of above-mentioned hemispherical lens match, but there is an air-gap between the two, fill with transparent material, the refractive index of described transparent material between 1.3～3.5, difference Δ n＜1 of the refractive index of the material of its refractive index and described lens.
9. according to the described straight down active mode dynamic backlight source structure of claim 1, it is characterized in that described optical lens uses transparent material processing based on light emitting diode.
10. according to the described straight down active mode dynamic backlight source structure of claim 1 based on light emitting diode, it is characterized in that, after the light that described light emitting diode sends changes direction through the lens refractive surface, on scattering film or scatter plate plane, form the Illumination Distribution of definite shape.This shape comprises positive 2N limit shape or rectangle or equilateral triangle, is realized by the lens of different structure respectively.
11. according to the described straight down active mode dynamic backlight source structure of claim 1 based on light emitting diode, it is characterized in that, that described lens can adopt is bonding, ultra-sonic welded, the mode that adds heat fixation or interlock are fixed on the encapsulation base plate of LED, obtains the lens of encapsulation LED.
12. according to the described straight down active mode dynamic backlight source structure of claim 11 based on light emitting diode, it is characterized in that, the arrangement mode of the lens of described encapsulation LED determined by the illumination region shape that lens form, and the arrangement mode of three lens that arrangement mode is a rectangle, the lens that form the equilateral triangle Illumination Distribution are the most adjacent that promptly forms four lens that arrangement mode is a positive 2N limit shape, the lens that form the rectangle Illumination Distribution are the most adjacent of 2N the most adjacent lens of the lens of positive 2N limit shape Illumination Distribution of N＞1 is an equilateral triangle.
13. according to the described straight down active mode dynamic backlight source structure of claim 11 based on light emitting diode, it is characterized in that, the illumination zone that the arrangement mode of the lens of described encapsulation LED will make a plurality of light emitting diodes form is combined, and forms large-scale uniform illumination and distributes.The formed illumination of each lens zone can not overlap, and can partially overlap yet.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101790303A CN101178515A (en) | 2007-12-10 | 2007-12-10 | Straight down active mode dynamic state back light source structure based on luminous diode |
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| CNA2007101790303A CN101178515A (en) | 2007-12-10 | 2007-12-10 | Straight down active mode dynamic state back light source structure based on luminous diode |
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| CN101178515A true CN101178515A (en) | 2008-05-14 |
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| CNA2007101790303A Pending CN101178515A (en) | 2007-12-10 | 2007-12-10 | Straight down active mode dynamic state back light source structure based on luminous diode |
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| CN102252267A (en) * | 2011-07-26 | 2011-11-23 | 青岛海信电器股份有限公司 | Lens, LED (light emitting diode) light source device and LED (light emitting diode) backlight module |
| CN102913852A (en) * | 2012-10-26 | 2013-02-06 | 扬州雷笛克光学有限公司 | Optical lens for forming square light shape |
| CN103133985A (en) * | 2011-11-29 | 2013-06-05 | 欧司朗股份有限公司 | Lighting device and assembling method thereof |
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| CN107191893A (en) * | 2017-07-24 | 2017-09-22 | 深圳市华星光电技术有限公司 | A kind of LED/light source lens and display panel |
| CN109140287A (en) * | 2017-06-16 | 2019-01-04 | 欧司朗股份有限公司 | Illumination apparatus and correlation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102252267A (en) * | 2011-07-26 | 2011-11-23 | 青岛海信电器股份有限公司 | Lens, LED (light emitting diode) light source device and LED (light emitting diode) backlight module |
| CN103133985A (en) * | 2011-11-29 | 2013-06-05 | 欧司朗股份有限公司 | Lighting device and assembling method thereof |
| CN103163682A (en) * | 2011-12-19 | 2013-06-19 | 财团法人工业技术研究院 | Naked eye type stereoscopic display |
| CN102913852A (en) * | 2012-10-26 | 2013-02-06 | 扬州雷笛克光学有限公司 | Optical lens for forming square light shape |
| WO2015067150A1 (en) * | 2013-11-06 | 2015-05-14 | 李超 | Three-primary colour led lamp with different light-emitting surfaces |
| CN105221974A (en) * | 2014-06-13 | 2016-01-06 | 清华大学 | Based on XY polynomial LED free form surface illumination system layout |
| CN105221974B (en) * | 2014-06-13 | 2017-05-31 | 清华大学 | Method for designing based on the polynomial LED free form surfaces illuminators of XY |
| CN109140287A (en) * | 2017-06-16 | 2019-01-04 | 欧司朗股份有限公司 | Illumination apparatus and correlation method |
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