CN102680095A - Light source with uniform chroma and brightness and color sensor with light source - Google Patents
Light source with uniform chroma and brightness and color sensor with light source Download PDFInfo
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- CN102680095A CN102680095A CN2011100542410A CN201110054241A CN102680095A CN 102680095 A CN102680095 A CN 102680095A CN 2011100542410 A CN2011100542410 A CN 2011100542410A CN 201110054241 A CN201110054241 A CN 201110054241A CN 102680095 A CN102680095 A CN 102680095A
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Abstract
Disclosed are a light source with uniform chroma and brightness and a color sensor with the light source. The color sensor mainly comprises the light source, a light splitting device and a sensing device, the light source in the scheme further comprises a plurality of LED elements, a primary light guide plate assembly and a secondary light guide plate assembly, the primary light guide plate assembly homogenizes the chroma and the brightness of various light spectra of the LED elements for the first time, light which is homogenized for the first time is guided into the secondary light guide plate assembly, the secondary light guide plate assembly homogenizes the chroma and the brightness of the light for the second time, and the light is used as the light source of the color sensor. Accordingly, the light source in the scheme not only is good in chroma and brightness homogenization, and further can meet standards of a standard illuminator D65, detection results of the color sensor are more accurate, particularly, the detection dimension of the sensor can be increased, but great increase of the cost is avoided.
Description
[technical field]
The invention relates to a kind of light source, especially a kind of with colourity and even brightness light source and have the color sensing appearance of this light source.
[background technology]
Human eye is for the perception of object color; Be from radiation of visible light to body surface; Receive the diffused light of body surface reflection; The thorn activation cone cell of being responsible for color sensitive, and convert light stimulus into electric signal to Brodmann area and differentiate, thus produce color perception and distinguish the color of object.Though the wavelength of visible light scope varies with each individual, generally can contain 400～750nm approximately.
Since the human color perception process respectively with light source, photographed object surface, and the cognition of observer's color relevant; Be not to be decided by photographed object merely; Therefore when the objective narration object of quantification presents color; Even get rid of observer more rambunctious become because of, still need consider the influence that light source causes.For getting rid of the disturbing factor of light source difference; Unified definition to color; (International Commission onIllumination CIE) defines several standard illuminantss and standard sources, like standard illuminants A, standard illuminants D and standard sources A... etc. in International Commission on Illumination.Wherein standard sources A can see through the osram lamp realization of filling halogen gas, though making with low cost and easy, its life-span is short, luminescence efficiency is low, is not the lamp source of ideal, economy.
A kind of commercially available aberration sensing appearance is as shown in Figure 1, is to adopt xenon lamp 11 (Xeon lamp) collocation filter to produce the roughly light source of conformance with standard working flare D 65; For satisfying the requirement of brightness and colourity uniformity coefficient; More be provided with about 15 a centimeters integrating sphere 1 of diameter and carry out mixed light; The total area of integrating sphere 1 opening is much smaller than the total surface area of integrating sphere, and light-emitting window 13 areas to be about light source incidence hole 12 twices big, and its light area that can provide is about the circle of diameter 10mm; Light piece uniformity coefficient＞98% at light-emitting window 13 places, and its color rendering approximately can a little higher than 90.Yet, this kind light source really light source of conformance with standard D65 spectral distribution of carrying on as before; So only can detect the relative hue of determinand as aberration sensing appearance, can not be as correct color sensing appearance.
Especially, in case will increase sensing range, then need increase the area of light-emitting window; That is the spheroid of need increase integrating sphere, but, then need use the spheroid of diameter 400mm if will increase survey area to diameter 200mm; Not only spheroid is bulky, and instrument itself will be too heavy, and the price of integrating sphere will significantly promote; And its light service efficiency approximately only 10% does not quite meet industrial needs.
Relatively, (Light Emitting Diode LED) has advantages such as luminescence efficiency height, long service life to light emitting diode, is suitable as light source; But it is narrower that shortcoming is a luminescent spectrum; Can't contain whole visible-range; Can deceive human eye even if mix fluorescent powder by the white light LEDs of blue-light excited gold-tinted combination or by the white light of redgreenblue combination; What let the human eye identification seen is white light, but goes into seriously its spectral distribution, does not still satisfy the definition of CIE standard illuminants.
Further; Owing to the material category that present LED is luminous is numerous; The optical wavelength that can send also the more also can be considered each monochromatic narrow frequency light of suitable matched combined, sees through the mechanism of mixed light; Use the synthetic analog light source that meets the standard illuminants of CIE definition, be called " standard illuminants simulated light " here.Because " standard illuminants simulated light " can really meet the definition of CIE standard illuminants, so can be used as the light source that the colourity of object color measures.
See through " standard illuminants simulated light " that multiple monochromatic LED number is combined into a cover standard light; Except that on spectral distribution, need coincideing with standard illuminants; In the certain function area; Also wanting to provide the uniformity coefficient of colourity and brightness respectively to reach the light piece more than 98% and 95%, if carry out the Spectral matching simulation according to the LED specification that can buy on the market, LED kind demand is about more than 20 kinds.
Therefore, how with numerous LED mixed light, also become a subject under discussion to be solved.General technology of mixing polychromatic source is common in optics framework in the projector and is that (dichroic mirror DM), adds in the main beam gradually, uses to integrate light component of all kinds and form light source by beam split color separation eyeglass with a plurality of Different Light.But on the one hand, each coloured light is added in the main beam one by one, at the light component that adds the more the time, the light component that more early adds is can be because of the beam split dichronic mirror of process numerous to be absorbed gradually and to reflect and weaken, thereby the light service efficiency reduces; Aspect in addition, setting up of all beam split dichronic mirrors must be parallel fully, just can reach the light effect that of collimation.Therefore, this common optics framework does not meet the demand of this case.
Another kind of common mixed light framework then is to utilize LGP, in the for example at present common display, can adopt the red, green, blue three-color LED as the backlight light source; And transfer the luminous mixed light colour mixture of side direction to area source via LGP; This kind utilizes the LGP of acryl system, and be as shown in Figure 2, can be divided into two sections; Preceding half section is the mixed light zone, and the second half section is the bright dipping zone.LGP is to utilize light when high refractive index medium transmits toward low refractive index dielectric, at some special angle the characteristic of total reflection will take place, and light beam can be transmitted under the very low situation of loss and scatter, and reaches the purpose of even mixed light.In addition, making texture in specific surface and destroy the total reflection of light in medium, make light beam can leave LGP and bright dipping, for ease of explanation, should the surface be exiting surface in this definition.
Yet blue-led element 21 is Lang Baidun distribution (Lambertian distribution) with the light beam that red LED element 22 penetrates, and light beam is the function of cos θ in the intensity of each angle of divergence, thereby introduces " steric effect " because of placement location is different.Mixed light piece will be blue partially in the zone near LED element 21, and will be red partially near the zone of LED element 22, make output optical zone 230 have obvious color inhomogeneous, cause the mixed light poor effect of this kind optics framework.When being used in field of display, on the one hand because LGP the place ahead also has equal mating plate, can be so that bright dipping homogenising once again; Aspect in addition, human eye for the light uniformity coefficient require really not so harsh; Especially, also have liquid crystal module in backlight the place ahead, even backlight is inhomogeneous surely, still have an opportunity to reach reverse compensation by means of the modulation of liquid crystal light valve, the image frame that is appeared is replied should have color, lets the audience can't discover the color non-uniform phenomenon.In addition, the LED of backlight typically uses many redgreenblue LED, and constantly repeated arrangement even if mixed light is inhomogeneous, under few, the repeated framework of light component, also is not easy to be discovered.
Relatively, above-mentioned optics framework is applied to color sensing appearance, need the coloured light of mixing more on the one hand, the number of times that identical LED repeats to occur is lower, and the mixed light non-uniform phenomenon is difficult to be remedied each other; Aspect in addition, the light of color sensing appearance, be by the light source direct irradiation to determinand, do not have liquid crystal light valve etc. mediate, can not compensate the inhomogeneous of bright dipping by this; And a little inhomogeneous light that exposes on the determinand that all will make does not satisfy the definition of CIE standard illuminants, and will cause measurement incorrect, is not suitable as the perfect light source of this case.
Therefore; How to design can will organize different center spectrum LED institute luminous more, with mode mixed light more uniformly, makes light source meet the definition of CIE standard illuminants fully; Thereby the light source of LED is expanded to colourity and even brightness area source, will be the important topic of making color sensing appearance light source.
[summary of the invention]
One of the present invention purpose is to provide a kind of colourity and even brightness light source.
Another object of the present invention is to provide a kind of colourity and even brightness light source of the CIE of meeting definition standard illuminants.
Another purpose of the present invention is to provide a kind of colourity and even brightness light source that is made for to color sensing appearance light source.
Colourity and even brightness light source that a purpose more of the present invention is to provide a kind of area of exiting surface to enlarge easily.
Another purpose again of the present invention is to provide a kind of color sensing appearance with colourity and even brightness light source.
Of the present invention again again a purpose be to provide a kind of and can measure the large scale determinand, manufacturing cost does not but need the color sensing appearance with colourity and even brightness light source that significantly promotes.
A kind of colourity and the even brightness light source that disclose according to the present invention comprise: a plurality of have at least two LED elements of different centre wavelength each other; One group comprises that a slice has an incidence surface and a light guide plate assembly adjacent to the LGP in downstream of the exiting surface of this incidence surface, and is formed with an output optical zone on the LGP exiting surface in these downstream; And one group comprise secondary LGP that plural pieces coincides each other and said secondary LGP have respectively an incidence surface and exiting surface adjacent to this incidence surface, and said secondary LGP incidence surface just to secondary light guide plate assembly that should the LGP output optical zone in downstream.
Utilize the colourity that above-mentioned light source processes and the color sensing appearance of even brightness light source; It is the reflected light colour component that supplies after the sensing determinand receives rayed; This color sensing appearance comprises: one group of colourity and even brightness light source comprise: a plurality of have at least two LED elements of different centre wavelength each other; One group comprises that a slice has an incidence surface and a light guide plate assembly adjacent to the LGP in downstream of the exiting surface of this incidence surface, and is formed with an output optical zone on the LGP exiting surface in these downstream; And one group comprise secondary LGP that plural pieces coincides each other and said secondary LGP have respectively an incidence surface and exiting surface adjacent to this incidence surface, and said secondary LGP incidence surface just to secondary light guide plate assembly that should the LGP output optical zone in downstream; One group supplies to receive this determinand in the luminous postradiation diffused light of this colourity and even brightness light source institute the light-dividing device that each wavelength components is separated; And one group of this light-dividing device of sensing separates the sensing apparatus of each wavelength composition light intensity.
Because the light source framework of this case; It is the LED element that a plurality of centre wavelengths are different; Be separately positioned on the incidence surface of a light guide plate assembly, with the last sheet in light guide plate assembly as the LGP in downstream, and with the exiting surface of its exiting surface as a light guide plate assembly.Subsequently,,, admit the bright dipping of a light guide plate assembly, carry out the secondary mixed light with the mode of the corresponding above-mentioned light guide plate assembly exiting surface of incidence surface with the plural pieces secondary LGP of secondary light guide plate assembly.
Because a light guide plate assembly can combine LGP of plural pieces; Incidence surface can hold more LED elements; No matter be to increase light intensity, or meet the D65 standard, can realize smoothly by the LED element of the different centre wavelengths of majority by increasing the LED component number.Aspect in addition, via the mixed light that is perpendicular to one another in fact for twice, a light guide plate assembly bright dipping inadequately uniformly problem can significantly improve, the colourity of whole bright dipping and brightness, homogenising fully, thereby reach above-mentioned all purposes.
[brief description of drawingsfig]
Fig. 1 is the synoptic diagram of known aberration sensing appearance;
Fig. 2 is the schematic perspective view of known LGP;
Fig. 3 is the synoptic diagram of light source first preferred embodiment of colourity and the brightness uniformity of this case;
Fig. 4 is the synoptic diagram of the secondary light guide plate assembly of Fig. 3 light source;
Fig. 5 is the shooting figure that captures light piece shadow and its color uniformity of picture affirmation behind light guide structure mixed light of tradition;
Fig. 6 be this case via secondary light guide plate assembly mixed light after acquisition light piece shadow and picture confirm the shooting figure of its color uniformity;
Fig. 7 is that Fig. 5 and Fig. 6 institute picked image are carried out the right line illustration of photo structure uniformity coefficient diversity ratio;
Fig. 8 is a line illustration of the uniformity coefficient of secondary light guide structure being got 20 observations;
Fig. 9 is the synoptic diagram of first preferred embodiment of this case with color sensing appearance of Fig. 3 light source;
Figure 10 is the synoptic diagram of second preferred embodiment of this case light source;
Figure 11 is the synoptic diagram of second preferred embodiment of this case color sensing appearance; And
Figure 12 is the synoptic diagram of the halo of Figure 11 color sensing appearance.
[main element symbol description]
1 integrating sphere, 11 xenon lamps, 13 light-emitting windows
12 incidence holes, 21,22,31 LED elements
230,326,326 ' output optical zone 3,3 " light source
32,320 LGPs of 32 ' light guide plate assembly
3201, LGP 322 incidence surfaces in 320 ' downstream
324 exiting surfaces 33,33 ' secondary light guide plate assembly
330,330 ' secondary LGP, 332 incidence surfaces
334 exiting surfaces 4,4 " light-dividing device
41 reflective gratings 42 " color separation filter
40 " halo 5,5 " sensing apparatus
6,6 " determinand
[embodiment]
About aforementioned and other technology contents, characteristics and effect of the present invention, in the following detailed description that cooperates with reference to graphic preferred embodiment, can clearly appear.
For making spectral distribution satisfy the definition of CIE standard illuminants, the LED elements of the different spectrum of this case many at present groups capable of using, the suitably narrow frequency light source of a plurality of different centre wavelengths of matched combined; And through the light mixing mechanism of LGP, the synthetic CIE definition standard illuminants it " standard illuminants simulated light " that meets, the light source that measures as the colourity of object color; With CIE 1931-(X; Y, Z) colorimeter system carries out the measurement of object color, sees through simple equation and is described below formula:
In this formula; S is an irradiates light; R is the determinand surface reflectivity;
then is color matching function, all is the function of wavelength.Learn by aforesaid equation, the spectral distribution of irradiates light will directly influence tristimulus values (X, Y, result Z), pretending is the polishing light piece of a colorimeter or color sensing appearance, in the effective coverage, its colour mixture and even light mixing degree all need reach specific standard.
Be to realize analog light source approximate test light source, the light source 3 of this case is as shown in Figure 3, includes plural LED element 31, light guide plate assembly 32, and secondary light guide plate assembly 33.A light guide plate assembly 32 in this example is to adopt multi-disc stacking type framework, utilizes multi-disc LGP 320 according to behind the identical geometric direction one-tenth cylinder one on top of another (cube), enlarges incidence surface to satisfy the demand that need fill out the numerous LED of cloth.LGP 320 of each sheet all has the adjacent exiting surface 324 of an incidence surface 322 and and incidence surface 322; And be formed with an output optical zone 326 on the exiting surface 324; And, be to coincide therefore with exiting surface 324 parallel mode correspondences because the LGP 320 of each sheet in this example all is a rectangular configuration; And for the purpose of explanation, in this definition LGP 320 of multi-disc one on top of another, exiting surface 324 is positioned at outermost a slice, is called the LGP 320 in downstream
1
In the lump with reference to shown in Figure 4; This routine secondary light guide plate assembly 33 is the rectangular structure that coincided and formed by plural pieces secondary LGP 330; Likewise; These secondary LGPs 330 also have an exiting surface 334 and the incidence surface 332 less than the area of exiting surface 334 respectively, and owing to secondary LGP 330 incidence surfaces 332 in this example also copline, and the total area of said incidence surface 332 slightly equals the LGP 320 in above-mentioned downstream
1Output optical zone 326, make when secondary light guide plate assembly 33 combines with a light guide plate assembly 32, from the mixed once light of a light guide plate assembly 32, just can almost completely get into secondary light guide plate assembly 33 and carry out the secondary mixed light, and rare energy loss.
For clearly showing the effect of improving of this case, shown in Figure 5 is with the mixed light beam polishing to of a light guide structure of tradition evenly behind the blank of scattering, utilizes CCD camera capture comparison and confirms the color uniformity of its light piece; Fig. 6 then be this case via secondary light guide plate assembly mixed light after, test institute's pick-up image equally, not only both produce significant difference aspect the uniformity coefficient of acquisition determinand image; Especially as shown in Figure 7; In case on institute's picked image, be benchmark, respectively on two image horizontal directions, to about the central point, respectively get 2 points according to same distance with the central point; And be 100% with the central point; Compare and can find for 2 then, light guide structure uniformity coefficient difference of tradition about ± 13%, the image color uniformity of this case obviously is improved to ± 2% in.If with the uniformity coefficient that graphic vertical direction is observed this case secondary light guide structure, get 20 observations, the result is as shown in Figure 8, and uniformity coefficient surpasses 98%.
By above-mentioned light source 3, first preferred embodiment of the color sensing appearance that the present invention discloses is as shown in Figure 9, includes light source 3, light-dividing device 4, reaches sensing apparatus 5.Hold the above, said LED element be according to its separately the luminescent center wavelength, send brightness that should the weight of centre wavelength in the spectral distribution of standard illuminants D65.By this, after the light source 3 that meets the D65 standard exposed to determinand 6, the diffused light that is produced was interpreted as the light-dividing device 4 of reflective gratings 41 via example; Each wavelength components in the diffused light is separated one by one; And adjustment reflective gratings 41 angles make selected a certain wavelength components reflex to sensing apparatus 5, change angle subsequently; Progressively measure the wavelength composition light intensity that each separates, feasible diffuse reflection composition from determinand 6 is accurately measured by sensing apparatus 5.
Certainly; As be familiar with present technique field person and can understand easily; Aforementioned LGP be shaped as rectangle, light guide plate assembly coincides for the plural pieces LGP and a light guide plate assembly output optical zone size just equals secondary light guide plate assembly incidence surface etc.; All be to give an example for ease of explanation; Second preferred embodiment of this case light source is shown in figure 10; Wherein a light guide plate assembly 32 ' only has the LGP 320 ' in single downstream, and the secondary LGP 330 ' in LGP in downstream 320 ' and the secondary light guide plate assembly 33 ' all is wedge structure, and the output optical zone 326 ' area of the LGP 320 ' in downstream is slightly larger than the incidence surface total area of secondary light guide plate assembly 33 '; Make the incidence surface of secondary light guide plate assembly 33 ' contain the LGP output optical zone 326 ' in downstream and reach a predetermined ratio, most bright dipping of the LGP 320 ' in downstream still can get into secondary light guide plate assembly 33 ' and not have significantly sacrificing.
Second preferred embodiment of this case color sensing appearance is respectively shown in Figure 11 and 12; Wherein, Light-dividing device 4 " be one and have a plurality of color separation filters 42 " halo 40 ", with halo 40 " rotation, light source 3 " expose to determinand 6 " diffusing of producing of back with halo 40 " and sequential rotate; pass through three color separation filters 42 respectively through for example red, blue, green color separation " carry out the branch chromogenic filter, and by sensing apparatus 5 " measure variant wavelength components one by one.
Because a kind of colourity of this case and the color sensing appearance of even brightness light source and this light source of tool are the combinations that utilizes twice light guide plate assembly, make each LED element issued light bundle can carry out the mixed light colour mixture of two dimension; After a light guide plate assembly carried out the mixed light first time, the uniformity coefficient of colourity and brightness was also not enough to some extent, imports the secondary light guide plate assembly again and carries out secondary mixed light; Can be with script colourity and the also uneven condition improved of brightness, the light source of the mixed light conformance with standard working flare D65 after assumed appearance degree and the brightness evenly, therefore; Use the color sensing appearance of this case; Not only more accurate, and volume also diminishes relatively, also more convenient in operation.
The above is merely preferred embodiment of the present invention; When not limiting the scope that the present invention implements with this; Be allly to apply for a patent simple equivalent that claims scope and description of the invention content done according to the present invention and change and modify, all should still belong in the scope that patent of the present invention contains.
Claims (11)
1. colourity and even brightness light source is characterized in that, comprising:
A plurality of have at least two LED elements of different centre wavelength each other;
One group comprises that a slice has an incidence surface and a light guide plate assembly adjacent to the LGP in downstream of the exiting surface of this incidence surface, and is formed with an output optical zone on the LGP exiting surface in these downstream; And
One group comprise secondary LGP that plural pieces coincides each other and said secondary LGP have respectively an incidence surface and exiting surface adjacent to this incidence surface, and said secondary LGP incidence surface just to secondary light guide plate assembly that should the LGP output optical zone in downstream.
2. colourity and even brightness light source according to claim 1 is characterized in that the incidence surface of wherein said secondary LGP is to contain the LGP output optical zone in these downstream to reach a predetermined ratio.
3. like said colourity of claim 2 and even brightness light source, it is characterized in that the incidence surface of wherein said secondary LGP is to contain the LGP output optical zone in these downstream.
4. like claim 1,2 or 3 said colourities and even brightness light source, it is characterized in that the incidence surface of wherein said secondary LGP is a copline.
5. like claim 1,2 or 3 said colourities and even brightness light source, it is characterized in that wherein said secondary LGP is a rectangular parallelepiped, and said incidence surface has the area less than said exiting surface.
6. like claim 1,2 or 3 said colourities and even brightness light source; It is characterized in that, wherein this light guide plate assembly more comprise LGP in the upper reaches that LGP of plural pieces and these downstream coincides, and the LGP in the said upper reaches have respectively an incidence surface and one adjacent to this incidence surface and with the exiting surface of the corresponding setting of LGP exiting surface in these downstream.
7. like said colourity of claim 6 and even brightness light source, it is characterized in that a wherein said LGP incidence surface is a copline.
8. like claim 1,2 or 3 said colourities and even brightness light source; It is characterized in that; Wherein said a plurality of LED element has a plurality of luminescent center wavelength respectively, and said LED element be according to its separately the luminescent center wavelength, send brightness that should the weight of centre wavelength in the spectral distribution of standard illuminants D65.
9. the color sensing appearance with colourity and even brightness light source is the reflected light colour component that supplies after determinand of sensing receives rayed, it is characterized in that this color sensing appearance comprises:
One group of colourity and even brightness light source comprise:
A plurality of have at least two LED elements of different centre wavelength each other;
One group comprises that a slice has an incidence surface and a light guide plate assembly adjacent to the LGP in downstream of the exiting surface of this incidence surface, and is formed with an output optical zone on the LGP exiting surface in these downstream; And
One group comprise secondary LGP that plural pieces coincides each other and said secondary LGP have respectively an incidence surface and exiting surface adjacent to this incidence surface, and said secondary LGP incidence surface just to secondary light guide plate assembly that should the LGP output optical zone in downstream;
One group supplies to receive this determinand in the luminous postradiation diffused light of this colourity and even brightness light source institute the light-dividing device that each wavelength components is separated; And
One group of this light-dividing device of sensing separates the sensing apparatus of each wavelength composition light intensity.
10. like the said color sensing of claim 9 appearance, it is characterized in that wherein this light-dividing device comprises one group of reflective gratings.
11., it is characterized in that wherein this light-dividing device comprises a component color optical filter like the said color sensing of claim 9 appearance.
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| CN2011100542410A CN102680095A (en) | 2011-03-08 | 2011-03-08 | Light source with uniform chroma and brightness and color sensor with light source |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107024484A (en) * | 2017-02-28 | 2017-08-08 | 张家港康得新光电材料有限公司 | Display screen defect estimation apparatus and its maintaining method and display screen to be detected |
| CN108333126A (en) * | 2018-01-17 | 2018-07-27 | 南通市第人民医院 | A kind of real-time dynamic spectrum cerebrospinal fluid monitoring system of artificial intelligence |
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Application publication date: 20120919 |