CN101520570A - Light emitting device, backlight module and a flat panel display - Google Patents
Light emitting device, backlight module and a flat panel display Download PDFInfo
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- CN101520570A CN101520570A CN200810080654A CN200810080654A CN101520570A CN 101520570 A CN101520570 A CN 101520570A CN 200810080654 A CN200810080654 A CN 200810080654A CN 200810080654 A CN200810080654 A CN 200810080654A CN 101520570 A CN101520570 A CN 101520570A
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Abstract
The invention discloses a light emitting device, a backlight module and a flat panel display. The light emitting device comprises a light emitting semiconductor component and a lenticle which covers the light emitting semiconductor component. The lenticle comprises two reflecting surfaces, two refracting surfaces and a Fresnel surface. The reflecting surfaces are arranged at two sides of one central axis of the lenticle, and the refracting surfaces are connected with one of the reflecting surfaces respectively and have an inclination angle with the central axis respectively. The refracting surfaces are extended for a certain distance towards the direction facing the bottom of the lenticle and the central axis in the place where the reflecting surfaces are connected. The Fresnel surface is connected between the refracting surfaces. Besides, the light emitted by the light emitting semiconductor component enters the lenticle, and partial light which is projected to each reflecting surface is reflected to at least one of the refracting surfaces and the Fresnel surface, then is refracted and centralized to one convergence angle.
Description
Technical field
The invention relates to a kind of light-emitting device, and particularly relevant for a kind of module backlight and flat-panel screens that has the light-emitting device of the low-angle angle of divergence and have this light-emitting device.
Background technology
In recent years, because various display techniques are constantly flourish, through after the research and development constantly, as new products such as LCD, plasma display, organic light emitting diode display, little by little commercialization and be applied to various sizes and the display device of various areas.And in whole display industry, invariably towards high brightness and high efficiency development, in the hope of producing the product that has more commercial value.In the middle of the various key parts and components of display, be used for supplying the module backlight of light source, luminescence efficiency to display integral body has very important influence power, when module backlight itself has good luminescence efficiency, not only can promote the brightness of display, the elasticity that other component design in the display also is provided and has made, but when the luminescence efficiency of module backlight itself is not good, the light source that can provide is limited, has often limited the brightness performance of display product.
The structure of module backlight generally is divided into two kinds of side-light type and straight-down negatives, and both function modes and range of application are different.No matter but be side-light type or straight-down negative, use the module backlight of LED source, owing to possess advantages such as high sophistication, high briliancy, no mercury, high color reproduction, can give liquid crystal panel higher surcharge, believe and can cross over various technical thresholds in future, make application by the portable electronic product rapid spread to fields such as automobile, display, TVs.And using light emitting diode as in the light source, light emission direction that must the exactissima diligentia light emitting diode produces good luminescence efficiency in the time of just making it with the modular structure collocation, and then reaches and promote the purpose that display product brightness shows.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of an existing LED encapsulation body.As shown in Figure 1, existing LED encapsulation body 10 is to include an encapsulation base 12 and a light-emitting diode chip for backlight unit 14.When electric current flows through PN junction in the light-emitting diode chip for backlight unit 14, can impel the electron hole in conjunction with and launch light because light is to disperse to all directions, therefore, last most light is to concentrate on one ± 60 ° the angle of divergence 16.When LED encapsulation body 10 was applied to the side of guiding device, such angle of divergence 16 can't reach gratifying luminescence efficiency fully.
Please refer to Fig. 2, Fig. 2 is the synoptic diagram of existing another LED encapsulation body.As shown in Figure 2, existing LED encapsulation body 30 includes half ball lens 32.When light autoluminescence diode package 30 emits, because the effect of hemisphere lens 32 can make light field (fieldof illumination) the 34 rough major axis 36 along LED encapsulation body 30 that produced at last.That is to say that the light that most of autoluminescence diode package 30 is emitted is upwards emission, and the light that fraction autoluminescence diode package 30 is emitted is to launch to both sides from LED encapsulation body 30.
Please refer to Fig. 3, the synoptic diagram when Fig. 3 is arranged at a light guide plate side for the LED encapsulation body of Fig. 2.As shown in Figure 3, in order to want to control the direct of travel of light, reaching good luminescence efficiency, existing LED encapsulation body 30 normally with a reflex housing 42 operate together.Reflex housing 42 will be reflected by the light that hemisphere lens 32 are emitted, and collimation changes into near parallel light 44, enters light guide plate 38 again, after carrying out a series of optical phenomena, becomes even planar light source, is supplied to display then.
Yet, such LED encapsulation body 30 after collocation reflex housing 42, though can obtain near parallel uniform light 44,, after light autoluminescence diode package 30 emits, but through the conversion of a series of medium.Whenever through a medium conversion time, the light of part will be absorbed by medium with the form of energy, convert the heat energy of medium to, so after medium conversion repeatedly, must cause the reduction of luminescence efficiency, and do not meet the aforementioned luminescence efficiency that as far as possible improves, to reach the principle that promotes display product brightness performance.
Therefore, how to develop and a kind of new LED encapsulation body, it not only has the low-angle angle of divergence, does not need the medium conversion through repeatedly when using again, to meet the demand of high-luminous-efficiency, just becomes crucial problem.
Summary of the invention
The invention provides a kind of light-emitting device, the angle of divergence of the light that it provided is less.
The invention provides a kind of module backlight, it can provide the backlight of high brightness.
The invention provides a kind of flat-panel screens, the brightness performance is preferable.
The present invention proposes a kind of light-emitting device, comprises a luminescent diode component and a phacoid, and wherein phacoid covers luminescent diode component.Phacoid includes two reflectings surface, two planes of refraction and a Fresnel (Fresnel) surface.Reflecting surface is the both sides that are arranged at an axis of centres of phacoid, plane of refraction connect respectively reflecting surface one of them, and respectively and have an inclination angle between the axis of centres.Plane of refraction is to extend a distance from connecting reflecting surface towards the direction of the phacoid bottom and the axis of centres.Fresnel surface is connected between the plane of refraction.In addition, the light that luminescent diode component is launched is to enter phacoid, and the part light that is projected to each reflecting surface be reflected onto plane of refraction and Fresnel surface at least one of them, be refracted again and be concentrated in the angle of convergence.
In light-emitting device of the present invention, luminescent diode component comprises an encapsulation base and is disposed at a light-emitting diode chip for backlight unit on the encapsulation base.
In light-emitting device of the present invention, phacoid comprises a polycarbonate lens body, a polymethyl acrylate phacoid, a resin lens or a glass lens body.
In light-emitting device of the present invention, reflecting surface is the both sides that are symmetricly set in the axis of centres, and plane of refraction is the both sides that are symmetricly set in the axis of centres, and a plurality of refraction part of Fresnel surface are the both sides that are symmetricly set in the axis of centres.
In light-emitting device of the present invention, angle of convergence be with the axis of centres ± 25 °.
In light-emitting device of the present invention, reflecting surface is the non-both sides that are symmetricly set in the axis of centres, and plane of refraction is the non-both sides that are symmetricly set in the axis of centres, and a plurality of refraction part of Fresnel surface are the non-both sides that are symmetricly set in the axis of centres.
In light-emitting device of the present invention, the angle of convergence and the axis of centres are 25 ° and-45 °.
In light-emitting device of the present invention, each reflecting surface is a cambered surface.
In light-emitting device of the present invention, reflecting surface is coated with a reflecting material.
In light-emitting device of the present invention, being projected to the light that the part of each reflecting surface launched by luminescent diode component is to be projected to plane of refraction and Fresnel surface again after reflecting surface produces total reflection.
In light-emitting device of the present invention, the plane of refraction and the angle between the reflecting surface that link to each other are acute angle.
In light-emitting device of the present invention, the light that directly is projected to plane of refraction and Fresnel lens is to be refracted and to be concentrated in the angle of convergence.
In light-emitting device of the present invention, light-emitting device also comprises a circuit board, in order to the carrying luminescent diode component.
The present invention proposes a kind of light-emitting device in addition, comprises a circuit board, a luminescent diode component and a phacoid.Luminescent diode component is to be disposed on the circuit board, and phacoid covers luminescent diode component.Phacoid includes two reflectings surface, a plurality of plane of refraction and a holding tank.Reflecting surface is the both sides that are arranged at an axis of centres of phacoid, and plane of refraction is to be arranged between the reflecting surface, and respectively and have an inclination angle between the axis of centres.Plane of refraction wherein two connect reflectings surface, and extend a distance towards the direction of the phacoid bottom and the axis of centres from connecting reflecting surface.Holding tank is positioned at the phacoid bottom, and luminescent diode component is to be positioned at holding tank.In addition, the light that luminescent diode component is launched is to enter phacoid, and the part light that is projected to each reflecting surface be reflected onto plane of refraction at least one of them, be refracted again and be concentrated in the angle of convergence.
In light-emitting device of the present invention, luminescent diode component is a surface adhesion type light-emitting diode element.
In light-emitting device of the present invention, the space of holding tank is greater than the volume of luminescent diode component, and the space between luminescent diode component and the holding tank is provided with transparent optical coupling glue.
In light-emitting device of the present invention, contain phosphor powder in the transparent optical coupling glue.
In light-emitting device of the present invention, the shape of holding tank is similar to the shape of luminescent diode component.
In light-emitting device of the present invention, light-emitting device also comprises a reflex housing, and phacoid is to be disposed on the reflex housing, and reflecting surface is to coincide on the surface of reflex housing.Reflex housing has a perforate and a plurality of register pin, and luminescent diode component is to be arranged in perforate and holding tank, and register pin passes circuit board.
In light-emitting device of the present invention, holding tank is a spherical groove.
In light-emitting device of the present invention, light-emitting device also comprises a fixed mount, and reflecting surface is to be fixed on the fixed mount, and the bottom of fixed mount has a plurality of register pins, passes circuit board.
In light-emitting device of the present invention, the bottom of each register pin has a grab.
In light-emitting device of the present invention, holding tank just can hold luminescent diode component.
In light-emitting device of the present invention, luminescent diode component comprises an encapsulation base, a light-emitting diode chip for backlight unit and a lead frame, and wherein encapsulation base is to be disposed on the circuit board, and light-emitting diode chip for backlight unit is disposed on the encapsulation base, and is positioned at holding tank.Lead frame then is to be electrically connected to light-emitting diode chip for backlight unit and circuit board.
In light-emitting device of the present invention, phacoid comprises a polycarbonate lens body, a polymethyl acrylate phacoid, a resin lens or a glass lens body.
In light-emitting device of the present invention, reflecting surface is the non-both sides that are symmetricly set in the axis of centres, and plane of refraction is the non-both sides that are symmetricly set in the axis of centres.
In light-emitting device of the present invention, angle of convergence is to be 25 ° and-45 ° with the axis of centres.
In light-emitting device of the present invention, reflecting surface is the both sides that are symmetricly set in the axis of centres, and plane of refraction is the both sides that are symmetricly set in the axis of centres.
In light-emitting device of the present invention, the angle of convergence and the axis of centres be ± and 25 °.
In light-emitting device of the present invention, each reflecting surface is a cambered surface.
In light-emitting device of the present invention, reflecting surface is coated with a reflecting material.
In light-emitting device of the present invention, being projected to the light that the part of each reflecting surface launched by luminescent diode component is to be projected to plane of refraction again after reflecting surface produces total reflection.
In light-emitting device of the present invention, the plane of refraction and the angle between the reflecting surface that link to each other are acute angle, and remaining plane of refraction is to constitute semi-sphere.
In light-emitting device of the present invention, the plane of refraction and the angle between the reflecting surface that link to each other are acute angle, and remaining plane of refraction is to constitute a triangular facet.
In light-emitting device of the present invention, the light that directly is projected to plane of refraction is to be refracted and to be concentrated in the angle of convergence.
In light-emitting device of the present invention, the quantity of the plane of refraction of phacoid is two, and plane of refraction connect respectively reflecting surface one of them, and phacoid also comprises a Fresnel surface, is connected between the plane of refraction.
The present invention proposes a kind of module backlight again, and it comprises a light guide, at least one optical thin film and at least one light-emitting device, and this light-emitting device is that above-mentioned two kinds of light-emitting devices are wherein a kind of.Optical thin film is to be disposed at the light guide top, and light-emitting device is disposed near the side of light guide.
In module backlight of the present invention, light guide is a light guide plate, and light-emitting device is to be disposed at by the light guide plate.
In module backlight of the present invention, light guide plate is plate shaped light guide plate or wedge shape light guide plate.
In module backlight of the present invention, light guide is a reflector plate.The two sides of this reflector plate are curved surface, and the bottom surface of this reflector plate has a perk structure, to form two reflectings surface.Module backlight comprises a plurality of light-emitting devices, is disposed at the two sides of reflector plate.
In module backlight of the present invention, light guide is a plate shaped light guide plate, and light-emitting device is to be disposed at the light guide plate below, and the part with respect to light-emitting device of a upper surface of light guide plate has taper depression.
In module backlight of the present invention, module backlight also comprises a reflector plate, is arranged at light guide plate bottom, and reflector plate has a perforate with respect to the part of light-emitting device.
The present invention reintroduces a kind of flat-panel screens, and it comprises a display panel and above-mentioned module backlight, and module wherein backlight is to be disposed at the display panel below.
The design of phacoid of the present invention can be concentrated to the light that luminescent diode component sent in one angle of convergence, so the angle of divergence of the light that light-emitting device provided is less.Therefore, use the light utilization ratio of module backlight of light-emitting device of the present invention preferable, so the backlight that high brightness can be provided is to display panel, and then promotes the brightness performance of flat-panel screens of the present invention.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is the synoptic diagram of an existing LED encapsulation body.
Fig. 2 is the synoptic diagram of existing another LED encapsulation body.
Synoptic diagram when Fig. 3 is arranged at a light guide plate side for the LED encapsulation body of Fig. 2.
Fig. 4 is the synoptic diagram of a kind of light-emitting device of first embodiment of the invention.
Fig. 5 is the synoptic diagram of an angle of convergence of the light-emitting device of Fig. 4.
Fig. 6 is the exploded view of a kind of light-emitting device of second embodiment of the invention.
Fig. 7 is the exploded view of the another kind of light-emitting device of second embodiment of the invention.
Fig. 8 is the stereographic map of the another kind of phacoid of second embodiment of the invention.
Fig. 9 is the exploded view of the light-emitting device of third embodiment of the invention.
Figure 10 is the exploded view of the light-emitting device of fourth embodiment of the invention.
Figure 11 is the exploded view of the light-emitting device of fifth embodiment of the invention.
Figure 12 is the synoptic diagram of a kind of module backlight of sixth embodiment of the invention.
Figure 13 is the synoptic diagram of a kind of module backlight of seventh embodiment of the invention.
Figure 14 is the synoptic diagram of a kind of module backlight of eighth embodiment of the invention.
Figure 15 is the synoptic diagram of a kind of module backlight of ninth embodiment of the invention.
Figure 16 is the synoptic diagram of a kind of flat-panel screens of tenth embodiment of the invention.
The main element symbol description:
10,30: LED encapsulation body
12,512: encapsulation base
14,514: light-emitting diode chip for backlight unit
16: the angle of divergence
32: the hemisphere lens
34: light field
36: major axis
38: light guide plate
42,540: reflex housing
44,234,274,284,414a, 414b: light
100,400,500,500c, 500d, 500e: light-emitting device
230,250,270,280,330: module backlight
232,252,282: light guide plate
236,256: the diffusion point
238,258,278,288: optics mechanism
272,286: reflector plate
273: reflecting surface
283: the taper depression
287,532,542: perforate
300: flat-panel screens
302: display panel
332: area source
410,510,510e: luminescent diode component
412: encapsulation base
414: light-emitting diode chip for backlight unit
420,520,520a, 520b, 520c, 520d: phacoid
421,521: the axis of centres
422,522: reflecting surface
424,524: plane of refraction
426: Fresnel surface
426a: refraction part
430,530: circuit board
512a: groove
516: lead frame
516a: first lead foot
516b: second lead foot
526: holding tank
544,554: register pin
550: fixed mount
556: grab
560: transparent optical coupling glue
θ: angle of convergence
θ
1, θ
2, θ
3, θ
4: the inclination angle
α, χ, γ: incident angle
χ ', γ ': refraction angle
Embodiment
First embodiment
Fig. 4 is the synoptic diagram of a kind of light-emitting device of first embodiment of the invention, and Fig. 5 is the synoptic diagram of an angle of convergence of the light-emitting device of Fig. 4.Please refer to Fig. 4, the light-emitting device 400 of present embodiment comprises a luminescent diode component 410 and a phacoid 420, and wherein phacoid 420 covers luminescent diode component 410.Phacoid 420 includes two reflectings surface 422, two planes of refraction 424 and a Fresnel surface 426.Reflecting surface 422 is the both sides that are arranged at an axis of centres 421 of phacoid 420, and each plane of refraction 424 connects a reflecting surface 422, and respectively and to have an inclination angle between the axis of centres 421 (be with θ in Fig. 4
1, θ
2Expression).Plane of refraction 424 is to extend a distance from connecting reflecting surface 422 towards the direction of phacoid 420 bottoms and the axis of centres 421.Fresnel surface 426 is connected between two planes of refraction 424.In addition, Fresnel surface 426 comprises a plurality of adjacent refraction part 426a, and these refraction part 426a is the both sides that are symmetricly set in the axis of centres 421.The angle of the ornaments of each refraction part 426a has a little difference.The divergent beams that these refraction part 426a can make luminescent diode component 410 be provided form parallel haply light beam.
Hold above-mentionedly, reflecting surface 422 for example is the both sides that are symmetricly set in the axis of centres 421, and plane of refraction 424 for example is the both sides that are symmetricly set in the axis of centres 421.In addition, each reflecting surface 422 for example is a cambered surface.The plane of refraction 422 and the angle between the reflecting surface 424 that link to each other for example are acute angle.In addition, phacoid 420 for example is a polycarbonate lens body, a polymethyl acrylate phacoid, a resin lens or a glass lens body.Phacoid 420 production methods for example are to utilize the mode of pouring into again demoulding to be made, but not as limit.
Above-mentioned luminescent diode component 410 for example is to be disposed on the circuit board 430.Wherein, luminescent diode component 410 can comprise an encapsulation base 412 and be disposed at a light-emitting diode chip for backlight unit 414 on the encapsulation base 412, and light-emitting diode chip for backlight unit 414 is to be electrically connected to circuit board 430.When electric current stayed PN junction in the light-emitting diode chip for backlight unit 414 via circuit board 430, can impel the electron hole in conjunction with and launch light 414a, 414b.Because light 414a, 414b are to all directions emissions, the light 414a (angle of divergence is approximately greater than 40 °～50 ° light) that therefore has part is projected to two reflectings surface 422.Owing to compare with air, phacoid 420 is a close medium, and air is a thin medium, so the refraction coefficient N1 of phacoid 420 is greater than the refraction coefficient N2 of air.Thus, the incident angle α that is projected to reflecting surface 422 as light 414a meets sin α ≧ N
2/ N
1The time, light 414a can produce total reflections respectively at two reflecting surface 422 places, and be reflected onto plane of refraction 424 and Fresnel surface 426 at least one of them.
And when light 414a is reflected onto plane of refraction 424 and Fresnel surface 426, also can produce an incident angle χ, at this moment, can produce the phenomenon of refraction at plane of refraction 424 and the interface of air and the interface of Fresnel surface 426 and air.That is to say that light 414a can enter plane of refraction 424 and Fresnel surface 426 with incident angle χ, its travel path can depart from the normal of plane of refraction 424 and Fresnel surface 426 then, leaves plane of refraction 424 with refraction angle χ '.And the relation of incident angle χ and refraction angle χ ' is as follows:
N1/N2＝sinχ/sinχ’
Because refraction coefficient N1 is greater than refraction coefficient N2, refraction angle χ ' can be greater than incident angle χ.Therefore, after through continuous total reflection and refraction, the light 414a that originally disperses is concentrated in the angle of convergence θ (as shown in Figure 5), and angle of convergence θ for example be with the axis of centres 421 ± 25 °.
Refer again to Fig. 4, the light 414b that launches from light-emitting diode chip for backlight unit 414 will directly be projected to Fresnel surface 426 because have the less angle of divergence, and then produces the phenomenon of refraction.That is to say that light 414b can enter Fresnel surface 426 with incident angle γ, its travel path can depart from the normal of Fresnel surface 426 then, leaves plane of refraction 426 with refraction angle γ '.And the relation of incident angle γ and refraction angle γ ' is as follows:
N1/N2＝sinγ/sinγ’
Because refraction coefficient N1 is greater than refraction coefficient N2, refraction angle γ ' can be greater than incident angle γ.At last, light 414b also is concentrated in the angle of convergence θ.
The phacoid 420 of present embodiment is the total reflection phenomenon that incident angle α when utilizing light 414a to enter reflecting surface 422 is produced during greater than critical angle, the direct of travel that suppresses the light 414a at the Vernonia parishii Hook angle of launching by light-emitting diode chip for backlight unit 414, the refraction effect that is produced when utilizing light 414a to enter plane of refraction 424 and Fresnel surface 426 again will guide in the angle of convergence θ.Therefore, the dispersion angle of the light that provided of the light-emitting device 400 of present embodiment is less.If during with these light-emitting device 400 collocation light guide plate, light 414a, the 414b that light-emitting diode chip for backlight unit 414 is launched only just is led to light guide plate via phacoid 420, and needn't so can avoid the loss of luminous energy, and can save the setting of various servicing units through other medium conversion.
What deserves to be mentioned is, because the phacoid 420 of present embodiment has Fresnel surface 426, so can make the thickness of phacoid 420 thinner.In addition, above-mentioned reflecting surface 422 is not to be necessary for cambered surface, and the mechanism of reflecting surface 422 reflection rays is not to be defined as total reflection.That is, also can on reflecting surface 422, be coated with reflecting material in the present embodiment, with reflection ray.
In addition, in the present embodiment, two reflectings surface 422 also can asymmetricly be arranged at the both sides of the axis of centres 421, and two planes of refraction 424 also can asymmetricly be arranged at the both sides of the axis of centres 421, and a plurality of refraction part 426a of Fresnel surface 426 also can asymmetricly be arranged at the both sides of the axis of centres 421.So, can allow the dispersion angle difference of light of the axis of centres 421 both sides, for instance, the light of the axis of centres 421 both sides can be concentrated to the axis of centres 421 and be in the angle of convergence of 25 ° and-45 °.
Below will enumerate the embodiment of a plurality of light-emitting devices again, its advantage is similar to the advantage of the light-emitting device 400 of present embodiment, so hereinafter will only describe at structural difference.
Second embodiment
Fig. 6 is the exploded view of a kind of light-emitting device of second embodiment of the invention.Please refer to Fig. 6, the light-emitting device 500 of present embodiment comprises a luminescent diode component 510, a phacoid 520 and a circuit board 530.Luminescent diode component 510 is to be disposed on the circuit board 530, and this circuit board 530 can be metal-core printed circuit board (MCPCB), and phacoid 520 covers luminescent diode component 510.Phacoid 520 includes two reflectings surface 522, a plurality of plane of refraction 524 and a holding tank 526.Reflecting surface 522 is the both sides that are arranged at an axis of centres 521 of phacoid 520, and plane of refraction 524 is to be arranged between the reflecting surface 522, and respectively and to have an inclination angle between the axis of centres 521 (be with θ in Fig. 6
1, θ
2, θ
3, θ
4Expression).Plane of refraction 524 wherein two connect reflectings surface 522, and extend a distance towards the direction of phacoid 520 bottoms and the axis of centres 521 from connecting reflecting surface 522.Holding tank 526 is positioned at phacoid 520 bottoms, and luminescent diode component 510 is to be positioned at holding tank 526.In addition, the light that luminescent diode component 510 is launched is to enter phacoid 520, and the part light that is projected to each reflecting surface 522 be reflected onto plane of refraction 524 at least one of them, be refracted again and be concentrated in the angle of convergence.
Hold above-mentionedly, reflecting surface 522 for example is the both sides that are symmetricly set in the axis of centres 521, and plane of refraction 524 for example is the both sides that are symmetricly set in the axis of centres 521.In addition, each reflecting surface 522 for example is a cambered surface.The plane of refraction 524 and the angle between the reflecting surface 522 that link to each other for example are acute angle, and remaining plane of refraction 524 for example is to constitute semi-sphere.In the present invention, the plane of refraction 524 that links to each other with reflecting surface 522 also can not constitute other shapes, as triangular facet (please refer to the phacoid 520a of Fig. 7).In addition, the phacoid 520 of present embodiment, the mechanism of its convergent light rays is similar to the phacoid 420 of first embodiment, and the difference place only is that the phacoid 520 of present embodiment is to utilize a plurality of planes of refraction 524 to replace the Fresnel surface 426 of phacoid 420.
In the present embodiment, luminescent diode component 510 for example is a surface adhesion type light-emitting diode element.In addition, light-emitting device 500 for example also comprises a reflex housing 540, be arranged on the circuit board 530, and phacoid 520 is to be disposed on the reflex housing 540, and reflecting surface 522 is to coincide on the surface of reflex housing 540.The material of this reflex housing 540 can be reflective white polycarbonate, and (polycarbonate, PC), metal or transparent colloid, but this transparent colloid need plate reflectance coating with the surface that the reflecting surface 522 of phacoid 520 is connected.In addition, reflex housing 540 has a perforate 542 and a plurality of register pins 544, and luminescent diode component 510 is to be arranged in perforate 542 and holding tank 526, and register pin 544 passes circuit board 530.In the present embodiment, can register pin 544 be binded mutually with circuit board 530 by colloid.
Hold above-mentionedly, the shape of holding tank 526 for example is similar to the shape of luminescent diode component 510.The space of the holding tank 526 of phacoid 520 is greater than the volume of luminescent diode component 510, and the space between luminescent diode component 510 and the holding tank 526 is provided with transparent optical coupling glue 560, its refractive index equates with the refractive index of phacoid 520 approximately, so can avoid the direct of travel of the light that luminescent diode component 510 sent to change because of the space between luminescent diode component 510 and the holding tank 526.The formation method of this transparent optical coupling glue 560 for example is that luminescent diode component 510, reflex housing 540 and phacoid 520 are assembled in after the circuit board 530, carries out encapsulating again.
What deserves to be mentioned is, phosphor powder can mix in transparent optical coupling glue 560, excite phosphor powder with the light that is sent by luminescent diode component 510, and then radiate the light of different colours, be mixed into other colors with the light that is sent with luminescent diode component 510.For instance, the blue light or the ultraviolet light that can utilize luminescent diode component 510 to be sent in the present embodiment excite phosphor powder, make phosphor powder radiate gold-tinted, blend together white light with the blue light that is sent with luminescent diode component 510.
In addition, the reflecting surface of phacoid and plane of refraction and the nonessential both sides that are symmetrical in the axis of centres in the present invention.In other words, shown in the phacoid 520b of Fig. 8, reflecting surface 522 also can asymmetricly be arranged at the both sides of the axis of centres 521, and plane of refraction 524 also can asymmetricly be arranged at the both sides of the axis of centres 521.So, can allow the dispersion angle difference of the axis of centres 521 both sides light, for instance, the axis of centres 521 both sides light can be concentrated to the axis of centres 521 and be in the angle of convergence of 25 ° and-45 °.
The 3rd embodiment
Fig. 9 is the exploded view of the light-emitting device of third embodiment of the invention.Please refer to Fig. 9, the light-emitting device 500c of present embodiment is similar to the light-emitting device 500 of Fig. 6, and difference is in the holding tank 526 of the phacoid 520c of light-emitting device 500c and is spherical groove, and the reflecting surface 522 of phacoid 520c is to be fixed on the fixed mount 550.The bottom of this fixed mount 550 has a plurality of register pins 554, and these register pins 554 are to pass circuit board 510.In addition, reflecting surface 522 can be fully reflecting surface, or can be coated with one deck reflection horizon between reflecting surface 522 and the fixed mount 550.
Because the holding tank 526 of the phacoid 520c of present embodiment is designed to spherical groove, after it can effectively improve phacoid 520c ejection formation, the problem of holding tank 526 easy deformation.In addition, space between luminescent diode component 510 and the holding tank 526 can utilize transparent optical coupling glue (not illustrating) to fill up, and the phosphor powder that also can mix in this transparent optical coupling glue, excite phosphor powder with the light that is sent by luminescent diode component 510, and then radiate the light of different colours.
The 4th embodiment
Figure 10 is the exploded view of the light-emitting device of fourth embodiment of the invention.Please refer to Figure 10, the difference of the light-emitting device 500d of present embodiment and the light-emitting device 500c of Fig. 9 be in, the holding tank 526 of the phacoid 520d of light-emitting device 500d just can hold luminescent diode component 510.In addition, the bottom of each register pin 524 of fixed mount 550 has a grab 526.In more detail, the assembling mode of light-emitting device 500d for example is earlier luminescent diode component 510 to be assembled on the circuit board 530, and the perforate 532 that makes grab 526 pass circuit board 530 afterwards again is to be fixed in fixed mount 550 on the circuit board 530 by grab 526.When fixed mount 550 was fixed on the circuit board 530, luminescent diode component 510 was to be positioned at holding tank 526.
Present embodiment does not need to hand over fixed mount 550 to be fixed on the circuit board 530 by colloid, when luminescent diode component 510 faults, can dismantle fixed mount 550 easily, with the luminescent diode component 510 that more renews.Therefore, the maintenance of the light-emitting device 500d of present embodiment is more or less freely.
The 5th embodiment
The luminescent diode component of being given an example in second to the 4th embodiment is an example with the surface adhesion type light-emitting diode element all, yet in the present invention, luminescent diode component is not defined as the surface adhesion type light-emitting diode element.Figure 11 is the exploded view of the light-emitting device of fifth embodiment of the invention.Please refer to Figure 11, the luminescent diode component 510e of the light-emitting device 500e of present embodiment comprises an encapsulation base 512, a light-emitting diode chip for backlight unit 514 and a lead frame 516, and wherein encapsulation base 512 for example is a heating radiator, and it is disposed on the circuit board 530.This encapsulation base 512 for example has a groove 512a, and light-emitting diode chip for backlight unit 514 for example is to be disposed in the groove 512a, and is provided with a thermal conductive insulation glue between light-emitting diode chip for backlight unit 514 and the encapsulation base 512.
In addition, lead frame 516 can comprise one first lead foot 516a and one second lead foot 516b, wherein the end of the first lead foot 516a is an electrode that is electrically connected to light-emitting diode chip for backlight unit 514, the other end is to be electrically connected to circuit board 530, and the end of the second lead foot 516b is another electrode that is electrically connected to light-emitting diode chip for backlight unit 514, and the other end is to be electrically connected to circuit board 530.In addition, electrically connect, between lead frame 516 and encapsulation base 512, insulator can be set for avoiding lead frame 516 and encapsulation base 512.
The 6th embodiment
Figure 12 is the synoptic diagram of a kind of module backlight of sixth embodiment of the invention.Please refer to Figure 12, the module backlight 230 of present embodiment comprises a light guide plate 232 (being light guide) and at least one light-emitting device 100, and wherein light-emitting device 100 is the sides that are arranged at light guide plate 232.This light-emitting device 100 can be any light-emitting device described in first embodiment to the, five embodiment.When light 234 when light-emitting device 100 emits, because the angle of divergence very little (± 25 °), so nearly all light 234 all can be injected within the light guide plate 232, diffusion point 236 via light guide plate 232 bottoms reflects light 234 upward then, produces uniform surface light source to be supplied to display panel through the optics mechanism of being made up of the optical thin films such as sheet and blast sheet that loose such as diffusion sheet, control 238 again.
In the present embodiment, because light guide plate 232 is plate shaped light guide plate, so its light-emitting device of arranging in pairs or groups 100 can be the asymmetric light-emitting device of the above-mentioned angle of divergence, so that the light uniformization effect of whole light guide plate 232 is better.
The 7th embodiment
Figure 13 is the synoptic diagram of a kind of module backlight of seventh embodiment of the invention.Please refer to Figure 13, the module backlight 250 of present embodiment comprises a light guide plate 252 (being light guide) and at least one light-emitting device 100, and wherein light-emitting device 100 is the sides that are arranged at light guide plate 252.Light guide plate 252 is the wedge shape light guide plate.In addition, light-emitting device 100 can be any light-emitting device described in first embodiment to the, five embodiment.When light 254 when light-emitting device 100 emits, because the angle of divergence very little (± 25 °), so nearly all light 254 all can be injected within the light guide plate 252, utilize the assisting of diffusion point 256 of the structure of light guide plate 252 itself and light guide plate 252 bottoms again, light 254 is reflected upward, produce uniform surface light source to be supplied to display panel through the optics mechanism of forming by the optical thin films such as sheet and blast sheet that loose such as diffusion sheet, control 238 then.
The 8th embodiment
Figure 14 is the synoptic diagram of a kind of module backlight of eighth embodiment of the invention.Please refer to Figure 14, module 270 backlight has a reflector plate 272 (being light guide).The two sides of this reflector plate 272 are curved surface, and the bottom surface of this reflector plate 272 has a perk structure, to form two reflectings surface 273.A plurality of light-emitting devices 100 of module 270 backlight, it is disposed at the two sides of reflector plate.When light 274 when light-emitting device 100 emits, because the angle of divergence very little (± 25 °), so nearly all light 274 all can orientating reflex face 273, and reflecting surface 273 can reflect light upward, and then, produce uniform surface light source at last to be supplied to display panel through by the optics mechanism 278 that optical thin films such as sheet and blast sheet are formed of loosing such as diffusion sheet, control.
The 9th embodiment
Figure 15 is the synoptic diagram of a kind of module backlight of ninth embodiment of the invention.Please refer to Figure 15, the module backlight 280 of present embodiment comprises a light guide plate 282 (being light guide) and at least one light-emitting device 100, and wherein light-emitting device 100 is the sides that are arranged at light guide plate 282.Light guide plate 282 is plate shaped light guide plate.Light-emitting device 100 is to be disposed at light guide plate 282 belows, and the part with respect to light-emitting device 100 of a upper surface of light guide plate 282 has taper depression 283.In addition, light-emitting device 100 can be any light-emitting device described in first embodiment to the, five embodiment.In addition, module 280 backlight also comprises a reflector plate 286, and it is arranged at light guide plate 282 bottoms, and reflector plate 286 has a perforate 287 with respect to the part of light-emitting device 100.
When light 284 when light-emitting device 100 emits, because the angle of divergence very little (± 25 °), so nearly all light 284 all can be injected within the light guide plate 282 via perforate 287, again by the surface reflection of taper depression 283, with homogenising in light guide plate 282.And reflector plate 286 can reflect light 284 upward, produces uniform surface light source to be supplied to display panel through the optics mechanism of being made up of the optical thin films such as sheet and blast sheet that loose such as diffusion sheet, control 288 then.
The tenth embodiment
Figure 16 is the synoptic diagram of a kind of flat-panel screens of tenth embodiment of the invention.Please refer to Figure 16, the flat-panel screens 300 of present embodiment includes a display panel 302 and a module 330 backlight, and module backlight 330 is the belows that are arranged at display panel 302.This display panel 302 can be display panels, and module backlight 330 can be any module backlight described in the 6th embodiment to the nine embodiment.Module 330 backlight can provide an area source 332 to display panel 302.
In sum, in the present invention, include reflecting surface and plane of refraction through the phacoid that designs, the light that therefore enters reflecting surface can be reflected, with the direct of travel of the light at the Vernonia parishii Hook angle that suppresses to be emitted by luminescent diode component, and plane of refraction can guide to light in one angle of convergence.Because light need just can not enter light guide plate through multiple medium conversion, has higher light utilization efficiency so use the module backlight of light-emitting device of the present invention.And, because the light utilization ratio of module backlight is preferable, so can promote the brightness performance of flat-panel screens.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (13)
1. flat-panel screens comprises:
One display panel;
One module backlight is disposed at this display panel below, and this module backlight comprises:
One light guide;
At least one optical thin film is disposed at this light guide top;
At least one light-emitting device is disposed near the side of this light guide, and this light-emitting device comprises:
One luminescent diode component;
One phacoid covers this luminescent diode component, and this phacoid includes:
Two reflectings surface are arranged at the both sides of an axis of centres of this phacoid;
Two planes of refraction, connect respectively those reflectings surface one of them, and respectively and have an inclination angle between this axis of centres, those planes of refraction are to extend a distance from connecting those reflectings surface towards the direction of this phacoid bottom and this axis of centres; And
One Fresnel surface is connected between those planes of refraction,
Wherein, the light that this luminescent diode component is launched is to enter this phacoid, and be projected to respectively the part light of this reflecting surface be reflected onto those planes of refraction and this Fresnel surface at least one of them, be refracted again and be concentrated in the angle of convergence.
2. flat-panel screens as claimed in claim 1 is characterized in that, this light guide is a plate shaped light guide plate, and this light-emitting device is to be disposed at this light guide plate below, and the part with respect to this light-emitting device of a upper surface of this light guide plate has taper depression.
3. flat-panel screens as claimed in claim 2 is characterized in that, this module backlight also comprises a reflector plate, is arranged at this light guide plate bottom, and this reflector plate has a perforate with respect to the part of this light-emitting device.
4. flat-panel screens as claimed in claim 1, it is characterized in that, this light guide is a reflector plate, the two sides of this reflector plate are curved surface, and the bottom surface of this reflector plate has a perk structure, forming two reflectings surface, and this module backlight comprises a plurality of these light-emitting devices, is disposed at the two sides of this reflector plate.
5. flat-panel screens as claimed in claim 1, it is characterized in that, those reflectings surface are non-both sides that are symmetricly set in this axis of centres, and those planes of refraction are non-both sides that are symmetricly set in this axis of centres, and a plurality of refraction part of this Fresnel surface are the non-both sides that are symmetricly set in this axis of centres.
6. flat-panel screens as claimed in claim 5 is characterized in that, this angle of convergence is to be 25 ° and-45 ° with this axis of centres.
7. flat-panel screens comprises:
One display panel;
One module backlight is disposed at this display panel below, and this module backlight comprises:
One light guide;
At least one optical thin film is disposed at this light guide top;
At least one light-emitting device comprises:
One circuit board;
One luminescent diode component is disposed on this circuit board;
One phacoid covers this luminescent diode component, and this phacoid includes:
Two reflectings surface are arranged at the both sides of an axis of centres of this phacoid;
A plurality of planes of refraction are arranged between those reflectings surface, and respectively and have an inclination angle between this axis of centres, those planes of refraction wherein two connect those reflectings surface, and extend a distance towards the direction of this phacoid bottom and this axis of centres from connecting those reflectings surface; And
One holding tank be positioned at this phacoid bottom, and this luminescent diode component is to be positioned at this holding tank;
Wherein, the light that this luminescent diode component is launched is to enter this phacoid, and be projected to respectively the part light of this reflecting surface be reflected onto those planes of refraction at least one of them, be refracted again and be concentrated in the angle of convergence.
8. flat-panel screens as claimed in claim 7 is characterized in that, this light guide is a plate shaped light guide plate, and this light-emitting device is to be disposed at this light guide plate below, and the part with respect to this light-emitting device of a upper surface of this light guide plate has taper depression.
9. flat-panel screens as claimed in claim 7 is characterized in that, the space of this holding tank is greater than the volume of this luminescent diode component, and the space between this luminescent diode component and this holding tank is provided with transparent optical coupling glue.
10. flat-panel screens as claimed in claim 9 is characterized in that, contains phosphor powder in this transparent optical coupling glue.
11. flat-panel screens as claimed in claim 7, it is characterized in that, also comprise a reflex housing, and this phacoid is to be disposed on this reflex housing, and those reflectings surface are to coincide on the surface of this reflex housing, wherein this reflex housing has a perforate and a plurality of register pin, and this luminescent diode component is to be arranged in this perforate and this holding tank, and those register pins pass this circuit board.
12. flat-panel screens as claimed in claim 7 is characterized in that, also comprises a fixed mount, those reflectings surface are to be fixed on this fixed mount, and the bottom of this fixed mount has a plurality of register pins, pass this circuit board.
13. flat-panel screens as claimed in claim 12 is characterized in that, the bottom of each register pin has a grab.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810080654A CN101520570A (en) | 2008-02-25 | 2008-02-25 | Light emitting device, backlight module and a flat panel display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810080654A CN101520570A (en) | 2008-02-25 | 2008-02-25 | Light emitting device, backlight module and a flat panel display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101520570A true CN101520570A (en) | 2009-09-02 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810080654A Pending CN101520570A (en) | 2008-02-25 | 2008-02-25 | Light emitting device, backlight module and a flat panel display |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101520570A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503138A (en) * | 2014-12-31 | 2015-04-08 | 东莞市亚星半导体有限公司 | Liquid crystal display screen with adjustable incident light |
| CN104793398A (en) * | 2015-04-08 | 2015-07-22 | 康佳集团股份有限公司 | Backlight module and back projection type liquid crystal television |
| CN107407472A (en) * | 2015-08-05 | 2017-11-28 | 株式会社派特莱 | Lenticular unit and light-emitting device |
| CN107799642A (en) * | 2017-10-23 | 2018-03-13 | 吴香辉 | LED is encapsulated |
| CN113847578A (en) * | 2021-10-23 | 2021-12-28 | 福建吉星智能科技股份有限公司 | Combined rotating curved lens for beacon light and working method thereof |
-
2008
- 2008-02-25 CN CN200810080654A patent/CN101520570A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104503138A (en) * | 2014-12-31 | 2015-04-08 | 东莞市亚星半导体有限公司 | Liquid crystal display screen with adjustable incident light |
| CN104793398A (en) * | 2015-04-08 | 2015-07-22 | 康佳集团股份有限公司 | Backlight module and back projection type liquid crystal television |
| CN107407472A (en) * | 2015-08-05 | 2017-11-28 | 株式会社派特莱 | Lenticular unit and light-emitting device |
| CN107799642A (en) * | 2017-10-23 | 2018-03-13 | 吴香辉 | LED is encapsulated |
| CN113847578A (en) * | 2021-10-23 | 2021-12-28 | 福建吉星智能科技股份有限公司 | Combined rotating curved lens for beacon light and working method thereof |
| CN113847578B (en) * | 2021-10-23 | 2023-11-14 | 福建吉星智能科技股份有限公司 | Combined rotating curved surface lens for navigation mark lamp and working method thereof |
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Open date: 20090902 |