CN1802588A - Compact LED module and projection display adopting the same - Google Patents
Compact LED module and projection display adopting the same Download PDFInfo
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- CN1802588A CN1802588A CN 200480015916 CN200480015916A CN1802588A CN 1802588 A CN1802588 A CN 1802588A CN 200480015916 CN200480015916 CN 200480015916 CN 200480015916 A CN200480015916 A CN 200480015916A CN 1802588 A CN1802588 A CN 1802588A
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Abstract
A compact light source module includes a compact light source and a collimator that includes a parabolic first reflective surface to reduce a radiation angle at which a light beam radiates from the compact light source, so as to emit the light beam through a side aperture and a plane second reflective surface which is located under the first reflective surface and comprises an incident portion through which the light beam radiates from the compact light source. The compact light source is located in the vicinity of a focal point of the first reflective surface.
Description
Technical field
The present invention relates to the projection display (projection display) of compact light source module (compact light source module) and this compact light source module of employing, more specifically, the compact light source module and the projection display that adopts this compact light source module that relate to the light source of use such as light emitting diode.
Background technology
Fig. 1 illustrates the structure of conventional projection display.With reference to Fig. 1, traditional projection display is included as the liquid crystal display of optical modulator (LCD) plate 20R, 20G and 20B, and irradiation light is to the lighting unit 10 of LCD plate 20R, 20G and 20B, and amplifies and the projecting lens 40 of the image that projection is modulated.
LCD plate 20R, 20G and 20B modulate red (R) that is suitable for each view data, green (G) and blue (B) light beam respectively, thus color display.Reference numeral 30 expression mixes the R, the G that are modulated and B light beam and then with the light beam irradiates of the mixing synthetic prisms to the projecting lens 40.
Light source 1 can be metal halide lamp or extra-high-pressure mercury vapour lamp, and it is positioned on the focus that has paraboloidal catoptron 2.Integrator 3 is used for uniform light beam irradiates to LCD plate 20R, 20G and 20B, and is made up of two fly lenses (fly-eye lens) usually, and wherein lenticule is a two-dimensional arrangements.The light beam that sees through integrator 3 is by collector lens 4 optically focused.Mirror 5R, 5G and 5B are catoptrons optionally, and they reflect the light beam of R, G and B light beam and other color of transmission respectively.Light beam is divided into R, G and B light beam respectively via mirror 5R, 5G and 5B, and R, G and B light beam incide respectively on LCD plate 20R, 20G and the 20B by relay lens 7 and 8 then.
LCD plate 20R, 20G and 20B modulate R, G and B light beam respectively, with output R, G and B coloured image.Synthetic prisms 30 will be mixed into a branch of from R, the G of LCD plate 20R, 20G and 20B output and B light beam, then, and the light beams that projecting lens 40 amplifies and transmission mixed.
Summary of the invention
Technical matters
But in this traditional projection display, lamp is used as the light source of light optics modulator and has the short life-span.Therefore, when traditional projection display was used as family expenses, lamp will often more renew.In addition, the size of light source is bigger.In order to address these problems, the miniature light sources such as light emitting diode (LED) that adopts relative longer life is studied.The open No.JP2001-42431 of Jap.P. discloses the projection arrangement that uses LED.
Fig. 2 illustrates the LED structure of the Luxeon Emitter that is made by LUMILEDS company.With reference to Fig. 2, be installed in the top of led chip 61 as the domed lens 62 of one of main optical device.Domed lens 62 is assembled from the next light beam of led chip emission.
Light beam by domed lens 62 has the light intensity distributions that reference number C 1 or C2 with Fig. 3 represent.In the curve map of Fig. 3, transverse axis is represented the angle of divergence (radiation angle), and the longitudinal axis is represented relative light intensity.Light intensity distributions C1 and C2 0 ° and ± be respectively wing and cheese gradual change in the angle of divergence between 90 °.Yet, the angle of divergence should 0 ° and ± 15 ° between, with light optics modulator 20R, 20G and 20B.Therefore, have the above-mentioned angle of divergence 0 ° and ± light beam of light intensity distributions between 15 °, that is, and have the above-mentioned angle of divergence 0 ° and ± light intensity distributions C1 between 15 ° or the segment beam of C2, fail light optics modulator 20R, 20G and 20B, thereby lose.Therefore optical efficiency descends.
In order to prevent this light loss, traditional projection display comprises second optical device, before being focused at light beam irradiates gone up to optical modulator 20R, 20G and 20B, it, light beam is had by the represented light intensity distributions of the reference number C 3 of Fig. 3 from the LED emitted light beams.Therefore, use second optical device to make the illuminator of conventional projection display complicated in addition, and increased the cost of making illuminator.
Usually, LED is than the light of metal halide lamp or extra-high-pressure mercury vapour lamp emission less amount.Therefore, traditional projection display uses led array as light source.In this case, second optical device is necessary.Yet, because second optical device must be lens, so light gathering efficiency descends.This is explained in more detail with reference to Fig. 4 A and 4B.
In the paraxial region, the product of size of images and angle is constant.Therefore, the product of the sterad of the emitting area of LED and LED emission angle (emission angle) is a steady state value, and this steady state value is called " etendue (etendue) ".During the product of the sterad that calculates less than the area of LCD plate and F value when etendue by projecting lens, the light gathering efficiency raising.
Shown in Fig. 4 A, when using a LED, the emitting area Φ of LED
LWith sterad U
LProduct can equal the emitting area Φ of LCD plate
LWith sterad U
PProduct.
Shown in Fig. 4 B, when using led array, the emitting area ∑ Φ of led array
LEmitting area Φ greater than the LED of Fig. 4 A
LHere, the sterad U of the emission angle of led array
LEqual the sterad U of the LED of Fig. 4 A
L, and the emitting area Φ of LCD plate
PEqual the emitting area Φ of the LCD plate of Fig. 4 A
LTherefore, constant in order to make etendue, the sterad U of the emission angle of the LCD plate of Fig. 4 B
P' greater than the sterad U of the LCD plate of Fig. 4 A
PTherefore, when the led array shown in use Fig. 4 B, light incurs loss, thereby causes the light gathering efficiency of the projection display and brightness to reduce.
Technical scheme
The invention provides a kind of compact light source module that comprises collimating apparatus, this collimating apparatus is used to collimate the light beam of launching from such as the miniature light sources of LED, thereby in the scope of the angle of divergence effectively with light beam irradiates to object, the present invention also provides a kind of projection display that adopts this compact light source module.
According to nonrestrictive, exemplary aspect of the present invention, a kind of compact light source module is provided, this compact light source module comprises: miniature light sources; And collimating apparatus, it comprises paraboloidal first reflecting surface and second reflecting surface, first reflecting surface is used to reduce the angle of divergence of light beam from the miniature light sources irradiation, so that light beam is launched by lateral aperture, second reflecting surface is positioned at the below of first reflecting surface and comprises incident portion, and light beam irradiates from miniature light sources by this incident portion.Miniature light sources is positioned near the focus of first reflecting surface.
The present invention has also conceived the reflectivity matched element that is arranged between miniature light sources and the collimating apparatus.The reflectivity of reflectivity matched element is less than the reflectivity of miniature light sources and greater than the reflectivity of collimating apparatus.
According to a further aspect in the invention, a kind of projection display is provided, and this projection display comprises lighting unit, will become be suitable for the optical modulator of view data and amplify and the projection optical device of the light beam that projection is launched from optical modulator from the beam modulation of illumination unit.Lighting unit comprises at least one compact light source module.This at least one compact light source module comprises miniature light sources and collimating apparatus, collimating apparatus comprises paraboloidal first reflecting surface and the second flat reflecting surface, first reflecting surface is used to reduce the angle of divergence of light beam from the miniature light sources irradiation, so that light beam is launched by lateral aperture, second reflecting surface is positioned at the below of first reflecting surface and comprises incident portion, and light beam irradiates from miniature light sources by this incident portion.Miniature light sources is positioned near the focus of first reflecting surface.
According to another aspect of the invention, provide a kind of compact light source module, this compact light source module comprises: miniature light sources; And collimating apparatus, it comprises paraboloidal first reflecting surface, this first reflecting surface is used to reduce the angle of divergence that light beam irradiates from miniature light sources, so that light beam is launched by lateral aperture.Miniature light sources is positioned near the focus of first reflecting surface.
In accordance with a further aspect of the present invention, a kind of projection display is provided, and this projection display comprises lighting unit, will become be suitable for the optical modulator of view data and amplify and the projection optical device of the light beam that projection is launched from optical modulator from the beam modulation of illumination unit.Lighting unit comprises: miniature light sources; And collimating apparatus, it comprises paraboloidal first reflecting surface, this first reflecting surface is used to reduce the angle of divergence that light beam irradiates from miniature light sources, so that light beam is launched by lateral aperture.Miniature light sources is positioned near the focus of first reflecting surface.
Beneficial effect
Compact light source module can comprise paraboloidal first reflecting surface, and this first reflecting surface is used to collimate the light beam that goes out from light source irradiation, thereby with angle of divergence illuminated objects effectively.In addition, compact light source module can comprise second reflecting surface, and this second reflecting surface is used to make the loss minimum of light, thereby improves optical efficiency.Compact light source module also can comprise the 3rd reflecting surface, and the 3rd reflecting surface is used for going out from light source irradiation with an angle of divergence towards first reflecting surface reflection but does not incide light beam on first reflecting surface.Therefore, can improve optical alignment efficient.In addition, second reflecting surface can tilt, to realize the compact light source module in small size aperture.Therefore, can in predetermined space, arrange the compact light source module of greater number, thereby can obtain brighter illumination light.
In addition, collimating apparatus can be filled cooling medium, descends because of heat with the illumination characteristic that prevents light source.Collimating apparatus can be formed by transparent body, to reach the coupling of refractive index.When arranging light source module, a plurality of collimating apparatuss can form monolithic entity (single body) maybe can have the depth-width ratio identical with optical modulator.Compact light source module of the present invention can be applicable to various lighting devices, for example backlight of the projection display, luminous plate, flat-panel monitor (FPD) etc.
The projection display of the present invention need not to comprise second optical device.Therefore, can simplify lighting unit and improve optical efficiency.Because this light source has than metal halide lamp or relative longer life-span of extra-high-pressure mercury vapour lamp, so need not to change continually new light sources.Thereby can simplify the projection display.
Description of drawings
Fig. 1 is the diagrammatic sketch that the structure of conventional projection display is shown;
Fig. 2 is the synoptic diagram that the structure of traditional LED is shown;
Fig. 3 illustrates the curve map that concerns between the angle of divergence of LED and the light intensity;
Fig. 4 A and 4B are the diagrammatic sketch that is used to explain the light gathering efficiency of the illuminator of using lens;
Fig. 5 is the decomposition diagram according to the compact light source module of the embodiment of the invention;
Fig. 6 is the cross-sectional view of cutting open along I-I ' line of Fig. 5;
Fig. 7 is the cross-sectional view of compact light source module according to another embodiment of the present invention;
Fig. 8 is the cross-sectional view according to the compact light source module of further embodiment of this invention;
Fig. 9 is the cross-sectional view of compact light source module according to yet another embodiment of the invention;
Figure 10 to 13 is cross-sectional view and the skeleton views according to the compact light source module of the employing transparent body of different embodiments of the invention;
Figure 14 illustrates the curve map of the light intensity distributions of the light beam of launching from the compact light source module of Figure 11 with respect to the simulation result of emission angle;
Figure 15 and 16 is the synoptic diagram that illustrate according to the structure of the projection display that uses transmission-type photomodulator and reflective light modulators respectively of the embodiment of the invention;
Figure 17 to 20 is the diagrammatic sketch that illustrate according to the various compact light source module arrays of different embodiments of the invention; With
Figure 21 illustrates the curve map of the light intensity distributions of the light beam of launching from the arrays of light source modules of Figure 20 with respect to the simulation result of emission angle.
Embodiment
Fig. 5 is the decomposition diagram according to the compact light source module of the embodiment of the invention, and Fig. 6 is the cross-sectional view of cutting open along I-I ' line of Fig. 5.With reference to Fig. 5 and 6, LED 200 is as miniature light sources.Collimating apparatus 101 is set on LED 200.LED 200 comprises the led chip 201 of launching light beam.Although do not illustrate, LED 200 also comprises the heating radiator that distributes the heat that is produced by led chip 201, and positive pole and negative pole that electric current is provided for led chip 201.In the present embodiment, LED 200 does not comprise the domed lens 62 of Fig. 2.This does not limit the scope of the invention.The structure of LED 200 is known for the person of ordinary skill of the art, thereby does not lay down a definition at this.
As mentioned above, first reflecting surface 130 is defined as having parabolic shape.Does term " parabola " represent that not only whose conic coefficient K is 1 strict parabolic shape, but also expression whose conic coefficient K exists? 0.4 arrive? 2.5 (preferably? 0.7 arrive? 1.6) scope in aspherical shape.The whose conic coefficient K of first reflecting surface 130 can suitably be defined as any value in the aforementioned range, and the feasible light of launching from miniature light sources is collimated into has the spread angle range that can make light effective lighting object.Describe now first reflecting surface 130 and have the example that whose conic coefficient K is 1 strict parabolic shape.
With reference to Fig. 6, light beam from LED 200 with the irradiation of the divergent angle A between 0 ° and 180 ° and incide first reflecting surface 130.In the present embodiment, divergent angle A is defined as from the counter clockwise direction of main shaft 140, and first reflecting surface 130 is paraboloidal.Therefore, light beam L1 is with greater than the irradiation of the divergent angle A of aperture angle B, and is reflected into parallelly with main shaft 140 from first reflecting surface 130, and launches by lateral aperture 120.Light beam L2, does not incide on first reflecting surface 130, but directly launches by lateral aperture 120 with the divergent angle A irradiation less than aperture angle B from LED 200.Therefore, light beam L2 launches by lateral aperture 120 with the emission angle C between 0 ° and the aperture angle B.Therefore, collimating apparatus 101 collimation is from the light beam of LED 200 with the divergent angle A irradiation between 0 ° and 180 °, makes it with the emission angle C emission between 0 ° and the aperture angle B.The aperture angle B illumination angle of compact light source module illuminated objects relatively adjusts.
In the present embodiment, suppose that LED 200 is pointolites, its point of irradiation is via focal point F 1 illumination beam.Yet LED 200 is not accurate pointolite, but has the area source of predetermined irradiated area.Therefore, the light beam from LED 200 irradiations can be considered to be near focal point F 1 irradiation.Therefore, a part of light beam of launching from LED 200 can reflect towards second reflecting surface 150 from first reflecting surface 130, and towards lateral aperture 120 reflections.Second reflecting surface 150 is used to receive the light beam part from first reflecting surface 130, then towards lateral aperture 120 these light beam parts of reflection, to improve optical efficiency.
Fig. 7 is the cross-sectional view of the compact light source module of another exemplary embodiment according to the present invention.With reference to Fig. 7, collimating apparatus 102 also comprises the 3rd reflecting surface 160.The 3rd reflecting surface 160 is formed on the edge of incident portion 110, with the light beam of reflection to shine less than the divergent angle A of aperture angle B.Light beam L3 shines with the divergent angle A 1 less than aperture angle B from LED200, and reflects towards first reflecting surface 130 from the 3rd reflecting surface 160.Therefore, though light beam L3 shines near the focal point F 1 of first reflecting surface 130, light beam L3 is considered to from the some E irradiation of intersecting with the 3rd reflecting surface 160.Therefore, not parallel from first reflecting surface, 130 beam reflected L3 with main shaft 140.But light beam L3 can be with the emission angle C1 emission less than initial divergent angle A 1.Thereby, can improve optical alignment efficient.
In the present embodiment, plate (panel) 170 is formed by transparent material.In the exemplary embodiment, except incident portion 110 (light beam irradiates by this incident portion 110 from LED 200), the interior or outside surface of plate 170 is coated with reflecting material, to form second reflecting surface 150 and the 3rd reflecting surface 160.Usually, when light beam when the medium of high index of refraction propagates into the medium of low-refraction, because poor between high index of refraction and the low-refraction, with light beam generation total reflection greater than the incident angle irradiation of critical angle.Along with the difference between the two media refractive index increases, more substantial light is by total reflection.The inside of the collimating apparatus 102 of Fig. 7 is full of air.Plate 170 can form greater than the refractive index of air and less than the transparent plastic or the glass of the refractive index of the material of making led chip 201 with refractive index, thereby as the index-matching material of the difference between the refractive index that reduces led chip 201 and air.
Fig. 8 is the cross-sectional view according to the compact light source module of further embodiment of this invention.With reference to Fig. 8, second reflecting surface 150 is with respect to the main shaft 140 angle of inclination D of first reflecting surface 130.LED 200 is mounted to and makes optical axis 202 basically or be approximately perpendicular to second reflecting surface 150.Thereby the optical axis 202 of LED 200 is with respect to the main shaft 140 angle of inclination D of first reflecting surface 130.Because this structure, the aperture size of collimating apparatus 103 can be reduced.Reference numeral AP2 represents the aperture size of collimating apparatus 103.Reference numeral AP1 presentation graphs 5 and 7 collimating apparatus 101 and 102 aperture size, in Fig. 5 and 7, second reflecting surface 150 is parallel to main shaft 140.As shown in Figure 8, the aperture size AP2 of collimating apparatus 103 is less than the aperture size AP1 of collimating apparatus 101 and 102.Aperture size reduces to help being provided with a plurality of compact light source module.
Simultaneously, collimating apparatus shown in Fig. 5 to 8 101,102 and 103 inside are full of air.Therefore, when LED 200 emission light beams, produce heat.And heat may have negative effect to the illumination characteristic of LED 200.
Fig. 9 is the cross-sectional view of compact light source module according to yet another embodiment of the invention.With reference to Fig. 9, the inside of collimating apparatus 104 is full of cooling medium.For this reason, LED 200 adheres on the collimating apparatus 104, so that cooling medium spills collimating apparatus 104.Can mounting cover glass (coverglass) 190 in a side of collimating apparatus 104, light beam is launched by this cover glass 190.Cooling medium can be benzene, glycerine, methyl alcohol etc.
Figure 10 to 12 is the cross-sectional views according to the compact light source module of different embodiments of the invention.These embodiment are characterised in that collimating apparatus is formed by transparent body.
With reference to Figure 10, transparent body 310 comprises paraboloidal outside surface 301, flat lower surface 302 and side surface 303.Preferably but not necessarily, lower surface 302 comprises main shaft 140.LED 200 is mounted to and makes led chip 201 be positioned at focal point F 1 place of outside surface 301.Outside surface 301 is coated with reflecting material, with first reflecting surface 130 of the light beam that irradiates from LED 200 as reflection.Except regional G (light beam irradiates from LED 200 by this zone G), lower surface 302 is coated with reflecting material, to be used as second reflecting surface 150.Zone G is as incident portion 110.Because this structure, transparent body 310 is as the collimating apparatus 101 of Fig. 5.Hereinafter, transparent body 310 is called collimating apparatus.
With reference to Figure 11, transparent body 320 comprises paraboloidal outside surface 301 and flat side surface 303.The lower surface of transparent body 320 comprises first and second surfaces 321 and 322, and has step and the inclined-plane 323 that forms border between first and second surfaces 321 and 322.Outside surface 301 is coated with reflecting material, with first reflecting surface 130 of the light beam that irradiates from LED 200 as reflection.Except regional G (light beam irradiates from LED 200 by this zone G), first surface 321 is coated with reflecting material.Second surface 322 and inclined-plane 323 also are coated with reflecting material.First and second surfaces 321 and 322 are as second reflecting surface 150.Zone G plays the effect of incident portion 110.Inclined-plane 323 plays the effect of the 3rd reflecting surface 160 of Fig. 7.Thereby transparent body 320 plays the effect of the collimating apparatus 102 of Fig. 7.Hereinafter, transparent body 320 is called collimating apparatus.
With reference to Figure 12, except collimating apparatus 340 was formed by transparent body, collimating apparatus 340 had the structure identical with the collimating apparatus 103 of Fig. 8.First and second surfaces 321 and 322 are as second reflecting surface 150, and the main shaft 140 angle of inclination D of opposing outer face 301.Therefore, the side surface 304 of collimating apparatus 340 is less than the collimating apparatus 310 of Figure 10 and 11 and 320 side surface 303.
Though not shown, the reflectivity matched element can be arranged between the LED 200 and collimating apparatus 310,320,330,340 of Figure 10 to 13.The reflectivity of reflectivity matched element is less than the reflectivity of LED 200 and greater than the reflectivity of collimating apparatus 310,320,330,340.
The array of compact light source module can be used as light source.Here, preferably but not necessarily, a plurality of collimating apparatuss closely adhere to mutually.For this purpose, as shown in figure 13, can use collimating apparatus 330, this collimating apparatus 330 comprises outside surface 301, and there is flat adhesive surface 331 its both sides.As under the situation of light source, can obtain illumination light in the compact light source module that will adopt collimating apparatus 330 near rectangle.Adhesive surface 331 can be applicable to the collimating apparatus shown in Fig. 5 to 12.
Figure 14 illustrates the curve map of the relative light intensity of the light beam that the side surface 303 of the collimating apparatus 320 by Figure 11 launches with respect to the simulation result of emission angle.As can be seen from Figure 14, relative light intensity concentrate on ± 20 ° emission angle in.Compare by light intensity distributions curve C 1 and C2, can observe the collimation efficient of collimating apparatus 320 relative light intensity of the present invention and Fig. 3.
As mentioned above, the angle of divergence of the light beam that irradiates from miniature light sources can become light beam and effectively incides angle on the object.The variation of the angle of divergence causes the raising of optical efficiency.In addition, when using compact light source module, need not in lighting device, to install second optical device as light source.Therefore, can prevent the light loss that causes by second optical device, and can simplify lighting device.
Use LED as miniature light sources though in the above embodiment of the present invention, described, can use various light sources.For example, can use various miniature light sources such as organic electroluminescent (EL) device, laser instrument etc.
Figure 15 is the synoptic diagram according to the projection display of the embodiment of the invention.Usually, be used for modulate illumination light and be divided into transmissive optical modulator and reflection-type optical modulator roughly with the optical modulator that is suitable for image information.In the present embodiment, the projection display adopts the transmissive optical modulator.
With reference to Figure 15, the projection display comprises the lighting unit 400 of the LCD plate 410 as the transmissive optical modulator, the LCD plate 410 that throws light on and amplifies the projection optical device 420 of also projection through the light beam of LCD plate 410 modulation.In the present embodiment, the projection display comprises three LCD plate 410R, 410G and the 410B that modulates R, G and B light beam respectively.Reference numeral 421 expressions are mixed into a branch of synthetic prisms with R, G and the B light beam of being modulated.LCD plate 410 for example can be 1 inch wide and long compact liquid crystal panels.Lighting unit 400 is installed with respect to each LCD plate 410R, 410G and 410B, with LCD plate 410R, 410G and the 410B of throwing light on respectively.Preferably, lighting unit 400 respectively with R, G and B light beam irradiates on LCD plate 410R, 410G and 410B.
Figure 16 is the synoptic diagram of the projection display according to another embodiment of the present invention.In the present embodiment, the projection display adopts the reflection-type optical modulator.
With reference to Figure 16, the projection display comprise be the reflection-type optical modulator Digital Micromirror Device (DMD) 430, illumination DMD 430 lighting unit 400 and amplify and projection through the projection optical device 440 of the light beam of DMD 430 modulation.In the present embodiment, the projection display uses a DMD 430 orders to modulate R, G and B picture signal.In this case, lighting unit 400 with R, G and B light beam sequential illumination to DMD 430.Reference numeral 441 expression total internal reflection (TIR) prisms, the light beam that it is launched from lighting unit 400 towards DMD 430 reflections, and towards the light beam of projection optical device's 440 transmissions by DMD 430 modulation.
Figure 15 and 16 lighting unit 400 comprise light source 403 and make the uniform integrator 401 of beam intensity that irradiates from light source 403, thereby throw light on whole optical modulator 410 and 430 equably.Lighting unit 400 also comprises relay lens 402, the beam direction optical modulator 410 and 430 that this relay lens 402 will be launched from integrator 401.Integrator 401 can be fly lens, rectangular parallelepiped protrusion part glass bar, rectangular parallelepiped protrusion part optical tube and inner reflection surface etc.
Compact light source module shown in Fig. 5 to 13 can be used as light source 403.When a compact light source module irradiation was enough to be used in the light quantity of Projection Display, this compact light source module can replace light source 403.But the light quantity of compact light source module irradiation usually is less than the light quantity of metal halide lamp or extra-high-pressure mercury vapour lamp irradiation.Therefore, preferably but not necessarily, light source 403 is two-dimensional arraies of a plurality of compact light source module.Hereinafter, for convenience's sake, will the compact light source module 501 or 502 shown in Figure 11 or 13 be described.
Figure 17 to 20 illustrates various types of arrays of light source modules.With reference to Figure 17, three compact light source module 501 are arranged in four lines.Here, aperture depth-width ratio (aspectratio) H: the V of compact light source module 501 arrays preferably equals the aperture depth-width ratio of optical modulator 410 and 430.
With reference to Figure 18, compact light source module 501 is arranged in the compact light source module 501 of the compact light source module 501 bracing part next lines that make lastrow.In other words, compact light source module 501 toothing.Thus, this structure can help to obtain uniform illumination light.
With reference to Figure 19, compact light source module 501 is arranged in first reflecting surface 301 of first reflecting surface 301 of the collimating apparatus 320 that makes two capable M1 and M2 in the face of the collimating apparatus 320 of following two row M3 and M4.Therefore, can obtain uniform illumination light by this structure.In addition, because paraboloidal first reflecting surface 301 faces outside interior and flat second surface 322 faces, so can obtain to have the illumination light of the depth-width ratio identical with the depth-width ratio of optical modulator 410 and 430.
As can be seen from Figure 20, three compact light source module 502 are arranged in six row.Each row of compact light source module 502 is arranged in the adhesive surface 331 that makes collimating apparatus 330 and closely adheres to mutually.In addition, in paraboloidal first reflecting surface 301 faces, and outside flat second surface 322 faces.Therefore, second surface 322 is positioned at the upside and the downside of compact light source module 502 arrays, and adhesive surface 331 is positioned at the right side and the left side of compact light source module 502 arrays.Thereby compact light source module 502 arrays have rectangular shape.This structure can help to obtain to have the illumination light of the depth-width ratio identical with the aperture depth-width ratio of optical modulator 410 and 430.
In the embodiment of Figure 17 to 20, can form monolithic entity with the collimating apparatus of the compact light source module in the delegation.In this case, compact light source module is arranged in as shown in figure 20.In addition, the compact light source module shown in Fig. 8 and 12 has the aperture of the depth-width ratio lower than the aperture depth-width ratio of the compact light source module shown in Fig. 5,6,7,9,10,11 and 13.Therefore, when the compact light source module of arranging shown in Fig. 8 and 12, the compact light source module of arranging greater number in the time of can be than the compact light source module shown in Pareto diagram 5,6,7,9,10,11 and 13.Thereby can obtain brighter illumination light.
Figure 21 illustrates the curve map of the relative light intensity of the light beam of launching from the arrays of light source modules of Figure 20 with respect to the simulation result of emission angle.As can be seen from Figure 21, relative light intensity be about 25% light beam concentrate on ± 15 ° emission angle in.Therefore, do not need the second other optical device to collimate.
As mentioned above, in the projection display of use compact light source module according to the present invention, light beam is shone from compact light source module with the effective angle of divergence, thus light optics modulator 410 and 430 effectively.Therefore, because the projection display does not need second optical device that is used to collimate, so lighting unit can be simplified greatly.In addition, the light gathering efficiency that can avoid the basic restriction by the optical system of using lens to cause reduces.Therefore, can improve optical efficiency.
Industrial usability
The device consistent with the present invention relates to the compact light source module of the light source of use such as light emitting diode, and the projection display that adopts this compact light source module.The projection display of the present invention need not to comprise second optical device.Therefore, can simplify lighting unit and improve optical efficiency.Because this light source has than metal halide lamp or relative longer life-span of extra-high-pressure mercury vapour lamp, so need not to change continually new light sources.Thereby can simplify the projection display.
Though specifically illustrate and described the present invention with reference to exemplary embodiment of the present invention, but those of ordinary skill in the art will understand, under the condition that does not break away from the spirit and scope of the present invention that are defined by the following claims, can do the various variations on form and the details.
Claims (26)
1. compact light source module, it comprises:
Miniature light sources; With
Collimating apparatus, it comprises,
Paraboloidal first reflecting surface, it is used to reduce the angle of divergence of light beam from described miniature light sources irradiation so that light beam is launched by lateral aperture and
Second reflecting surface, it is positioned at the below of described first reflecting surface and comprises incident portion, and described light beam shines from described miniature light sources by this incident portion,
Wherein, described miniature light sources is positioned near the focus of described first reflecting surface.
2. compact light source module as claimed in claim 1, wherein, described miniature light sources has an optical axis, and is arranged to make the main shaft of described optical axis perpendicular to described first reflecting surface.
3. compact light source module as claimed in claim 1, wherein, described second reflecting surface is with respect to the main shaft of described first reflecting surface pitch angle that tilts, so that the size of described lateral aperture reduces, described miniature light sources is arranged to make its optical axis with respect to the described main shaft inclination pitch angle identical with the pitch angle of described second reflecting surface.
4. compact light source module as claimed in claim 1, wherein, described collimating apparatus also is included in the 3rd reflecting surface of described incident portion one edge, and described the 3rd reflecting surface is used for the light beam that irradiates from described miniature light sources with the angle of divergence bigger than the aperture angle of described lateral aperture towards described first reflecting surface reflection.
5. compact light source module as claimed in claim 1, wherein, cooling medium is filled in the inner space between described first and second reflectings surface.
6. compact light source module as claimed in claim 1, wherein, described collimating apparatus has a transparent body, described transparent body comprises paraboloidal outside surface, flat lower surface and the side surface that is used to launch light beam, described paraboloidal outside surface and described flat lower surface are coated with reflecting material except described incident portion, to form described first and second reflectings surface.
7. compact light source module as claimed in claim 6, wherein, described collimating apparatus comprises it being respectively the both sides of flat adhesive surface.
8. compact light source module as claimed in claim 6, wherein, described collimating apparatus also comprises the inclined-plane that is used to form border between described lower surface and the described incident portion, described inclined-plane is coated with reflecting material to form the 3rd reflecting surface, the light beam that described the 3rd reflecting surface irradiates from described miniature light sources with the angle of divergence bigger than the aperture angle of described lateral aperture towards described first reflecting surface reflection.
9. compact light source module as claimed in claim 8, wherein, described collimating apparatus comprises it being respectively the both sides of flat adhesive surface.
10. compact light source module as claimed in claim 1, wherein, also comprise the reflectivity matched element that is arranged between described miniature light sources and the described collimating apparatus, wherein, the reflectivity of described reflectivity matched element is less than the reflectivity of described miniature light sources and greater than the reflectivity of described collimating apparatus.
11. projection display, it comprises that lighting unit, the beam modulation that will go out from described illumination unit become be suitable for the optical modulator of view data and amplify and the projection optical device of the light beam that projection is launched from described optical modulator, and described lighting unit comprises:
At least one compact light source module, it comprises miniature light sources and collimating apparatus, described collimating apparatus comprises:
Paraboloidal first reflecting surface, it is used to reduce the angle of divergence of light beam from described miniature light sources irradiation so that light beam is launched by lateral aperture and
Second reflecting surface, it is positioned at the below of described first reflecting surface and comprises incident portion, and described light beam shines from described miniature light sources by this incident portion,
Wherein, described miniature light sources is positioned near the focus of described first reflecting surface.
12. the projection display as claimed in claim 11, wherein, described miniature light sources has an optical axis, and is arranged to make the main shaft of described optical axis perpendicular to described first reflecting surface.
13. the projection display as claimed in claim 11, wherein, described second reflecting surface is with respect to the main shaft of described first reflecting surface pitch angle that tilts, so that the size of described lateral aperture reduces, described miniature light sources is arranged to make its optical axis with respect to the described main shaft inclination pitch angle identical with the pitch angle of described second reflecting surface.
14. the projection display as claimed in claim 11, wherein, described collimating apparatus also is included in the 3rd reflecting surface of described incident portion one edge, and described the 3rd reflecting surface is used for the light beam that irradiates from described miniature light sources with the angle of divergence bigger than the aperture angle of described lateral aperture towards described first reflecting surface reflection.
15. the projection display as claimed in claim 11, wherein, cooling medium is filled in the inner space between described first and second reflectings surface.
16. the projection display as claimed in claim 11, wherein, described collimating apparatus has transparent body, described transparent body comprises paraboloidal outside surface, flat lower surface and the side surface that is used to launch light beam, described paraboloidal outside surface and described flat lower surface are coated with reflecting material except described incident portion, to form described first and second reflectings surface.
17. the projection display as claimed in claim 16, wherein, described collimating apparatus comprises it being respectively the both sides of flat adhesive surface.
18. the projection display as claimed in claim 16, wherein, described collimating apparatus also comprises the inclined-plane that is used to form border between described lower surface and the described incident portion, described inclined-plane is coated with reflecting material to form the 3rd reflecting surface, the light beam that described the 3rd reflecting surface irradiates from described miniature light sources with the angle of divergence bigger than the aperture angle of described lateral aperture towards described first reflecting surface reflection.
19. the projection display as claimed in claim 18, wherein, described collimating apparatus comprises it being respectively the both sides of flat adhesive surface.
20. the projection display as claimed in claim 11, wherein, described compact light source module also comprises the reflectivity matched element that is arranged between described miniature light sources and the described collimating apparatus, and the reflectivity of described reflectivity matched element is less than the reflectivity of described miniature light sources and greater than the reflectivity of described collimating apparatus.
21. the projection display as claimed in claim 11, wherein, it also comprises a plurality of compact light source module of two-dimensional arrangements.
22. the projection display as claimed in claim 21, wherein, described a plurality of compact light source module are arranged in the aperture depth-width ratio that the aperture depth-width ratio that makes described a plurality of compact light source module equals described optical modulator.
23. the projection display as claimed in claim 21, wherein, the compact light source module of delegation is arranged in the compact light source module of adjacent lines.
24. the projection display as claimed in claim 21, wherein, the collimating apparatus of a plurality of compact light source module of delegation forms monolithic entity.
25. a compact light source module, it comprises:
Miniature light sources; With
Collimating apparatus, it comprises paraboloidal first reflecting surface, described first reflecting surface is used to reduce the angle of divergence of light beam from described miniature light sources irradiation, so that light beam launches by lateral aperture,
Wherein, described miniature light sources is positioned near the focus of described first reflecting surface.
26. projection display, it comprises that lighting unit, the beam modulation that will go out from described illumination unit become be suitable for the optical modulator of view data and amplify and the projection optical device of the light beam that projection is launched from described optical modulator, and described lighting unit comprises:
Miniature light sources; With
Collimating apparatus, it comprises paraboloidal first reflecting surface, described first reflecting surface is used to reduce the angle of divergence of light beam from described miniature light sources irradiation, so that light beam launches by lateral aperture,
Wherein, described miniature light sources is positioned near the focus of described first reflecting surface.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US47703503P | 2003-06-10 | 2003-06-10 | |
| US60/477,035 | 2003-06-10 | ||
| KR1020030064207 | 2003-09-16 | ||
| KR1020040018284 | 2004-03-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1802588A true CN1802588A (en) | 2006-07-12 |
| CN100370311C CN100370311C (en) | 2008-02-20 |
Family
ID=36811830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800159169A Expired - Fee Related CN100370311C (en) | 2003-06-10 | 2004-06-05 | Compact LED module and projection display adopting the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100370311C (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010045763A1 (en) * | 2008-10-23 | 2010-04-29 | 深圳市中电开拓实业有限公司 | Light collimating device |
| CN102853330A (en) * | 2011-06-28 | 2013-01-02 | 夏普株式会社 | Illumination device and vehicle headlight |
| CN105301867A (en) * | 2015-11-05 | 2016-02-03 | 苏州威盛视信息科技有限公司 | Scattering linear light source apparatus |
| CN105487331A (en) * | 2016-01-14 | 2016-04-13 | *** | Light source assembly for projection system |
| CN108180443A (en) * | 2013-07-18 | 2018-06-19 | 夸克星有限责任公司 | Source light injection is not parallel to the lighting device of device optical axis |
| CN111322587A (en) * | 2018-12-13 | 2020-06-23 | 深圳市中光工业技术研究院 | Light source device |
| CN112219395A (en) * | 2018-05-15 | 2021-01-12 | 普列斯半导体有限公司 | LED backlight |
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| US5146248A (en) * | 1987-12-23 | 1992-09-08 | North American Philips Corporation | Light valve projection system with improved illumination |
| JP3147370B2 (en) * | 1990-09-28 | 2001-03-19 | 三菱電機株式会社 | Projection display device |
| JPH08111107A (en) * | 1994-10-06 | 1996-04-30 | Fujitsu Ltd | Light source device and projection type display device |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010045763A1 (en) * | 2008-10-23 | 2010-04-29 | 深圳市中电开拓实业有限公司 | Light collimating device |
| CN102853330A (en) * | 2011-06-28 | 2013-01-02 | 夏普株式会社 | Illumination device and vehicle headlight |
| CN108180443A (en) * | 2013-07-18 | 2018-06-19 | 夸克星有限责任公司 | Source light injection is not parallel to the lighting device of device optical axis |
| CN108180443B (en) * | 2013-07-18 | 2020-09-15 | 夸克星有限责任公司 | Illumination device with source light injection non-parallel to device optical axis |
| CN105301867A (en) * | 2015-11-05 | 2016-02-03 | 苏州威盛视信息科技有限公司 | Scattering linear light source apparatus |
| CN105487331A (en) * | 2016-01-14 | 2016-04-13 | *** | Light source assembly for projection system |
| CN105487331B (en) * | 2016-01-14 | 2017-12-08 | *** | A kind of light source assembly for optical projection system |
| CN112219395A (en) * | 2018-05-15 | 2021-01-12 | 普列斯半导体有限公司 | LED backlight |
| US11874589B2 (en) | 2018-05-15 | 2024-01-16 | Plessey Semiconductors Limited | LED backlight |
| CN111322587A (en) * | 2018-12-13 | 2020-06-23 | 深圳市中光工业技术研究院 | Light source device |
| CN111322587B (en) * | 2018-12-13 | 2022-09-02 | 深圳市中光工业技术研究院 | Light source device |
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| CN100370311C (en) | 2008-02-20 |
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