CN101000458A - LED lighting device and optical device using it - Google Patents
LED lighting device and optical device using it Download PDFInfo
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- CN101000458A CN101000458A CN 200610037691 CN200610037691A CN101000458A CN 101000458 A CN101000458 A CN 101000458A CN 200610037691 CN200610037691 CN 200610037691 CN 200610037691 A CN200610037691 A CN 200610037691A CN 101000458 A CN101000458 A CN 101000458A
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Abstract
A LED illumination device consists of light generating unit formed by at least two LED and used to generate auxiliary light source with different wavelength and near to master light source to generated, light synthesizing unit for synthesizing auxiliary light source generated by said light generating unit and for emitting out said auxiliary light source as master one. The optical unit applying said illumination device is also disclosed.
Description
Technical field
The present invention relates to lamp optical system, particularly utilize the lamp optical system of LED.
Background technology
Recently,, the demand and the concern of large-scale view display with high image resolution grown with each passing day along with the fast development of satellite and digital broadcasting technology, thereby the prospect and the more importance attached of projection (Projection) and projector (Project).
Meanwhile, strong day by day to the requirement that has high image resolution, high gray scale, high-resolution picture, thereupon to the new Optical System Research that has high light utilization ratio also in flourishing expansion.
In general, liquid crystal projector) and (the Cathode Ray Tube Projector: of CRT projector cathode ray tube projector) and (the Digital Light Processing Projector: ' digital light core ' projector) etc. of DLP projector the infiltration type display device is meant the equipment that utilizes projection optics system to amplify the projection picture, for example (the Liquid Crystal Display Projector: of LCD projector.
The light source that is used for above-mentioned projector uses lamp (Lamp) mostly, can be divided into reflection-type and infiltration type according to the kind of display screen.At this moment, because lamp is a white light source, so need be used to separate/synthesize the device of color.
In addition, such as LCD projector, it is divided into two kinds: a kind of is one chip projector---form by a coloured filter that R/G/B three looks are installed, another kind is a three-chip type projector--penetrating mirror (Dichroic Mirror) by branch from light source--after the white light that-lamp sends is separated into R/G/B, via monochrome (mono) LCD that is configured on each light path, synthetic again by each color prism, project in the screen (screen) by projection lens.
Below common reflection-type optical device and infiltration type optical devices are described.
Fig. 1 a is common one chip reflection-type optical device synoptic diagram, below with reference to this figure the reflection-type optical device is described.
At first, from light source--the white light that lamp 11 sends will have sequentially through red R, green G and blue B light by color switch (ColorSwich) or colour wheel (Color Wheel).
At this moment, be injected into integrator (Integrator) 13 by the light of color separation, carry out repeatedly total reflection (Total Reflection) in inside, penetrate light homogeneous (Uniformity) and be shaped (Shaping) thereby make through above-mentioned color switch or colour wheel 12.
And the light that penetrates through above-mentioned integrator 13 arrives at illuminating lens 14 and boundling equably.
Light through said lighting system lens 14 boundlings was separated by polarisation in PBS16 before LCD display (panel) 15, and the light of S polarized condition is towards LCD display 15, but the light of P polarized condition then scatters and disappears.
And then, the light that changes by the impressed voltage of above-mentioned LCD display 15 will be by PBS16, and projects in the screen by projecting lens 17.
Fig. 1 b is common infiltration type optical devices synoptic diagram, below with reference to this figure the infiltration type optical devices is described.
At first, from illuminator--the light that lamp sends projects FEL (Fly Eye Lens) 22, will improve uniformity of light (Uniformity), and will be by illuminator lens 23 by boundling via the light of above-mentioned FEL22 projection.
The light that penetrates by above-mentioned field of illumination 21,22,23 is at first from the coloured light separation equipment--and red reflective mirror 24 sees through blueness and green light, and red light then reflects.Then, the red light that is reflected is reflected on the catoptron 27 that is positioned at next end, arrives at red light liquid crystal portion 30.
Simultaneously, blue light that sees through at above-mentioned red reflective mirror 24 and green light are once more via the coloured light separation equipment--green light catoptron 25, and green light is reflected, and blue light sees through.
Then, the green light that is reflected arrives at green light liquid crystal portion 31, and is reflected at the catoptron 26 that is positioned at next end via the blue light that above-mentioned green light catoptron 25 sees through, and arrives at blue light liquid crystal portion 32.
And, the coloured light that above-mentioned red/green light changes separately with liquid crystal portion 30,31,32, contain with the corresponding image information of various coloured light after, the coloured light of change is incided dichroic cross (cross dichroic prism) 33.
The above-mentioned dichroic cross 33 synthetic coloured light that change separately behind synthetic color picture, project in the screen via projecting lens 34, form the projection picture.
The mode that reflection-type noted earlier or infiltration type optical devices are used is: because what use is white light source, so will carry out image processing after color separation, and by projection lens it is throwed, then show image.Therefore, these optical devices have the complex optical parts formation.
In addition,, the dichroism because of lamp uses up, so can there be the problem that to know best white coordinate owing to can't effectively making.
As the one chip display screen, agree in order to make color and signal of video signal, must be adjusted to synchronously, thereby system's control is very complicated.
Simultaneously, the characteristics of LED (Light-Emitting Diode) are that the angle of emergence of illumination is big, when using in optical system (Projection System), can produce etendue (Etendue) problem, use up thereby can not effectively make.
Etendue definition such as following mathematical expression 1:
E＝∫∫cosθdAdΩ
DA is the unit area of light source, and d Ω is the unit solid angle (Solid Angle) of light source, and θ is the angle that is formed centrally in normal (normal) and the solid angle of light source.
The plane etendue of above-mentioned definition can be by following mathematical expression 2 definition.
That is, as utilize the optical system of LED, its physical characteristics is: if the area of light source is big and light that penetrate radiates after forming the big angle, even use any optical system all can't overcome it so.
Therefore, this just means: have only each unit area many from the light quantity that LED penetrates, perhaps the angular distribution of the light of She Chuing is little, could constitute effective optical system.
The present LED that makes, in order to improve light quantity, each unit area or raise the efficiency perhaps improves light-emitting area, reduces the angular distribution of the light that penetrates, improving overall optical efficiency, but this with the system of use standard lamp mutually specific efficiency be lower.
The result can use a plurality of LED in order to obtain essential light quantity, but can have the problem that can't increase light quantity because of the influence of etendue.
Summary of the invention
Therefore, this invention finds out for addressing the above problem, and purpose is to provide the LED light compositing in order to LED lighting device that improves optical efficiency and the optical devices that utilize it.
For achieving the above object, the LED lighting device of this invention is meant the lighting device of the image documentation equipment that is used to produce the required main light source of show image, and it comprises two parts: the light generating unit of being made up of the plural at least LED that is used to produce near the secondary light source of the different wavelength of the main light source that will produce; The secondary light source of the synthetic different wavelength that produces from above-mentioned smooth generating unit also is emitted as the light compositing device of main light source with it.
Here, above-mentioned main light source have with red, green, blueness in the corresponding wavelength of any one color of light.
And above-mentioned smooth generating unit comprises 1LED and 2LED.Wherein, 1LED is used to produce the secondary light source that has near the 1st wavelength of above-mentioned main light source wavelength, and 2LED is used to produce and has near above-mentioned main light source wavelength and secondary light source different the 2nd wavelength of above-mentioned the 1st wavelength.
And above-mentioned light compositing device is meant by the dichronic mirror (Dichroic Mirror) that reflects or see through incident light from the secondary light source wavelength of above-mentioned smooth generating unit incident.
And, above-mentioned light compositing device sees through the secondary light source of the 1st wavelength that produces from above-mentioned 1LED towards the 1st direction,, synthetic then the secondary light source of the 2nd wavelength that produces from above-mentioned 2LED from the above-mentioned the 1st and the secondary light source that produces of 2LED towards the direction reflection identical with above-mentioned the 1st direction.
In addition, for achieving the above object, this invention is relevant utilizes the optical devices of LED lighting device to be made up of following components: be provided with the plural LED that is used to produce near the light source of the different wavelength of red wavelength, and the synthetic light source that produces from above-mentioned plural LED is in order to produce the red illumination device of red light source; Be provided with the plural LED that is used to produce near the light source of the different wavelength of green wavelength, and the synthetic light source that from above-mentioned plural LED, produces, in order to produce the green illumination device of green light source; Be provided with the plural LED that is used to produce near the light source of the different wavelength of blue wavelength, and the synthetic light source that from above-mentioned plural LED, produces, in order to produce the blue illumination device of blue-light source; Redness, green, the blue-light source that utilization produces from above-mentioned redness, green, blue illumination device comes the display screen of show image; The image that is presented on the above-mentioned display screen is amplified the projection lens that projects in the screen.
Other purposes, characteristic and the advantage of this invention just can come into plain view by the embodiment explanation with reference to accompanying drawing.
In sum, the LED lighting device of this invention and utilize its optical system to have following effect:
This invention can overcome etendue (Etendue) problem of LED thereby the optical efficiency that can improve the lighting device that utilizes LED and utilize its optical devices by light compositing equipment.
Description of drawings
Fig. 1 a and Fig. 1 b are the structural representations of common reflection-type optical device and infiltration type optical devices.
Fig. 2 is that the lighting device that utilizes LED of this invention constitutes synoptic diagram.
Fig. 3 is each color wavelength distribution schematic diagram of LED.
* accompanying drawing major part symbol description *
110,120:LED 210,220: integrator
310,320: illuminating lens 400: the light compositing device
Embodiment
With reference to the accompanying drawings to the LED lighting device of this invention and utilize the desirable embodiment of its optical devices to describe.
Fig. 2 is that the lighting device that utilizes LED of this invention constitutes synoptic diagram.
As shown in the figure, the LED lighting device of this invention is meant the lighting device of the image documentation equipment that is used to produce the required main light source of show image, and it comprises two parts: the light generating unit of being made up of the plural at least LED that is used to produce near the secondary light source of the different wavelength of the main light source that will produce; Synthesize from the secondary light source of the different wavelength of above-mentioned smooth generating unit generation, and it is emitted as the light compositing device 400 of main light source.
When configuration on the same space or plane during LED, though use up along with the increase of etendue (Etendue) can't effectively make, this invention can make the light amplification of same etendue by light compositing device 400.
Recently, LED has the wavelength of numerous species, and various LED has Wavelength distribution shown in Figure 3.
Can learn from LED Wavelength distribution shown in Figure 3,, can obtain having the LED of different centre wavelengths easily at red/green color separately.
And, in order to produce and red, green, blue relevant light source, can produce LED at red/green with approaching different wavelength.
This invention can make the LED light compositing near the different wavelength of red/green light source, thereby can carry out amplification to light in the same etendue.
At first, with reference to Fig. 2 and Fig. 3 the LED lighting device embodiment that is used to make red light source is described.
Such as the lighting device that is used for producing the reddish orange (RED ORANGE) that is used for red light source, use be to have the red LED 110 of 627nm centre wavelength and yellow led 122 with 590nm centre wavelength.
And, utilize correlation integral device 210,220 to improve the uniformity coefficient (Uniformity) of the light that from above-mentioned red LED 110 and yellow led 120, produces, after amplifying, synthesize light then by light compositing device 400 via 310,320 pairs of light of illuminating lens.
At this moment, when making above-mentioned light compositing device (Beam Combiner) 400 employed dichronic mirrors, accomplish the light that produces from red LED 110 is seen through towards the 1st direction, and a light that produces from yellow led 120 is towards the direction reflection identical with the 1st direction.That is, this light compositing device should possess the performance that sees through and reflect by the LED optical wavelength.
In the embodiment of Fig. 2, red LED 110 is arranged on plane of incidence end, presses specific direction and see through RED light, and yellow led 120 is arranged on the outgoing plane end, by seeing through the identical direction reflection sodium yellow of direction, it is combined to penetrate into a kind of light with above-mentioned red light.
By above-mentioned light compositing device 400 synthetic only synthesized red light and sodium yellow, so have and the corresponding wavelength of reddish orange, reddish orange illumination is mapped to the reflection-type display screen or the infiltration type display screen is first-class will form image.
That is,, produced a kind of light because the display screen of show image (diagram omit) is gone up red LED light and yellow led light is synthesized being used for, thus identical etendue had, and light quantity increases about 2 times.
And, be the light of 627nm and 590nm wavelength owing to what synthesize, thereby will use the wavelength value in the middle of their.
If red LED light and yellow led the light only different and light of centre wavelength distribute identically, synthetic wavelength will be 608.5nm (=(627+590)/2) value so, and to compare colour purity quite a lot of with the red light that existing lamp produces.
Also can synthesize light for green or blue-light source, and can obtain and the similar result of reddish orange, utilize it can demonstrate fully the performance of optical devices with method same as described above.
For example, when existence has the LED of Fig. 3 Wavelength distribution, can utilize and green close blue-green LED and yellow led in order to make green light source, can utilize and blue close royal blue (Royal Blue) LED and blue-green LED in order to make blue-light source.
Promptly, if be used to make the red illumination device and the blue illumination device that is used to make the green illumination device of green light source and be used to make blue-light source of red light source simultaneously, so, red/green/blue main light source is shone be made into image on the display screen that is used for show image after, this image will amplify via projecting lens and project in the screen.
So this invention will be synthesized near the plural LED light of main light source (R/G/B) wavelength for the etendue problem that solves LED, under same etendue light quantity is carried out amplification then, thereby can increase optical efficiency.
By the content of above explanation, the related work personnel can carry out various changes and modification fully in the scope that does not break away from this invention technological thought.
Therefore, the technical scope of this invention is not limited to the content that embodiment puts down in writing, and should decide according to patent claim.
Claims (6)
1, a kind of LED lighting device is used to produce the image documentation equipment of the required main light source of show image, it is characterized in that, comprises following two parts:
The light generating unit comprises the plural at least LED that is used to produce near the secondary light source of the different wavelength of the main light source that will produce;
The light compositing device synthesizes from the secondary light source of the different wavelength of above-mentioned smooth generating unit generation, then it is emitted as main light source.
2, as LED lighting device as described in the claim item 1, it is characterized in that, above-mentioned main light source have with red, green, blueness in the relevant wavelength of any one color of light.
3, as LED lighting device as described in the claim item 1, it is characterized in that above-mentioned smooth generating unit comprises following two parts:
1LED is used to produce the secondary light source that has near the 1st wavelength of above-mentioned main light source wavelength;
2LED is used to produce and has near above-mentioned main light source and secondary light source different the 2nd wavelength of the 1st wavelength.
4, as LED lighting device as described in the claim item 3, it is characterized in that above-mentioned light compositing device is meant the dichronic mirror that incident light is reflected or sees through according to the secondary light source wavelength from above-mentioned smooth generating unit incident.
5, as LED lighting device as described in the claim item 3, it is characterized in that, the secondary light source that produces from above-mentioned 1LED is seen through towards the 1st direction, the secondary light source that from above-mentioned 2LED, produces towards the direction reflection identical with above-mentioned the 1st direction, then to from the above-mentioned the 1st and 2LED the secondary light source that produces synthesize.
6, utilize the optical devices of LED lighting device, it is characterized in that, comprise following components:
Be provided with the plural LED that is used to produce near the light source of the different wavelength of red wavelength, and the synthetic light source that from above-mentioned plural LED, produces, in order to produce the red illumination device of red light source;
Be provided with the plural LED that is used to produce near the light source of the different wavelength of green wavelength, and the synthetic light source that from above-mentioned plural LED, produces, in order to produce the green illumination device of green light source;
Be provided with the plural LED that is used to produce near the light source of the different wavelength of blue wavelength, and the synthetic light source that from above-mentioned plural LED, produces, in order to produce the blue illumination device of blue-light source;
Redness, green, the blue-light source that utilization produces from above-mentioned redness, green, blue illumination device comes the display screen of show image;
The image that is presented on the above-mentioned display screen is amplified the projection lens that projects in the screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610037691 CN101000458A (en) | 2006-01-10 | 2006-01-10 | LED lighting device and optical device using it |
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| CN 200610037691 CN101000458A (en) | 2006-01-10 | 2006-01-10 | LED lighting device and optical device using it |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106165412A (en) * | 2014-04-04 | 2016-11-23 | 巴科股份有限公司 | Projecting illumination system |
| USRE48107E1 (en) | 2007-07-30 | 2020-07-21 | Appotronics Corporation Limited | Multicolor illumination device using moving plate with wavelength conversion materials |
-
2006
- 2006-01-10 CN CN 200610037691 patent/CN101000458A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USRE48107E1 (en) | 2007-07-30 | 2020-07-21 | Appotronics Corporation Limited | Multicolor illumination device using moving plate with wavelength conversion materials |
| CN106165412A (en) * | 2014-04-04 | 2016-11-23 | 巴科股份有限公司 | Projecting illumination system |
| US11067885B2 (en) | 2014-04-04 | 2021-07-20 | Barco Nv | Laser projection illumination system |
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