CN103807647A - LED quasi-Lambert area light source - Google Patents

LED quasi-Lambert area light source Download PDF

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Publication number
CN103807647A
CN103807647A CN201410049737.2A CN201410049737A CN103807647A CN 103807647 A CN103807647 A CN 103807647A CN 201410049737 A CN201410049737 A CN 201410049737A CN 103807647 A CN103807647 A CN 103807647A
Authority
CN
China
Prior art keywords
led
light source
drive circuit
accurate
heat sink
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410049737.2A
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Chinese (zh)
Inventor
刘磊
赵丽霞
安平博
朱石超
李晋闽
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Institute of Semiconductors of CAS
Original Assignee
Institute of Semiconductors of CAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institute of Semiconductors of CAS filed Critical Institute of Semiconductors of CAS
Priority to CN201410049737.2A priority Critical patent/CN103807647A/en
Publication of CN103807647A publication Critical patent/CN103807647A/en
Pending legal-status Critical Current

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Abstract

The invention provides an LED quasi-Lambert area light source. The LED quasi-Lambert area light source comprises an extrusion aluminum profile heat sink provided with a cooling fan, a drive circuit, an LED array, an optical dispersion compensation membrane and an optical diffusion plate, wherein the extrusion aluminum profile heat sink provided with the cooling fan is located on the LED constant-current drive circuit, the LED array is electrically connected with the LED constant-current drive circuit and located on the LED constant-current drive circuit, the optical dispersion compensation membrane is located on the LED array, the optical diffusion plate is located on the optical dispersion compensation membrane and attached to the optical dispersion compensation membrane. The LED quasi-Lambert area light source can generate an adjustable area light source within a visible wave band. Due to the high reliability and high stability of LEDs, the LED quasi-Lambert area light source can be used as a standard light source in a standard measuring device.

Description

The accurate lambertian light source of LED
Technical field
The present invention relates to the accurate lambertian light source of a kind of LED, it can produce adjustable area source in visible waveband.Because of high reliability and the high stability of LED, this area source can be used as the standard sources in standard measuring equipment.
Background technology
LED (1ight-emitting diode), claims again light emitting diode.It has the features such as efficiency is high, brightness is large, reliability is high, low in energy consumption, is the light source of new generation that substitutes traditional lighting.LED is spot light, and its utilizing emitted light has very strong directionality, and its optical parametric is relevant with viewing angle, and there is no definite optical axis.And the location of measurement direction will obviously affect the accuracy of measurement result, therefore often adopt planar light source to reduce light source direction to the impact of measuring.
Lambertian source claims again cosine area source, and it is at the luminous intensity I of a direction θequal the luminous intensity I in this face vertical direction 0be multiplied by direction cosine of an angle cos θ, meet Lambert law (or cosine law) I θ=I 0cos θ, so its brightness in all directions all equates.Blackbody radiator is exactly desirable lambert's surface of emission, and the diffusing globe of often using in optical radiation measurement is similar to lambertian to a great extent as opal glass, white diffuse reflector etc.
At present, the light modulation of LED mainly adopts PWM (pulsewidth modulation) technology, and it is to utilize to control flow through time of LED of electric current and regulate the brightness of LED.PWM light regulating technology coordinates RGB three primary colours mixed light technology just can make LED array bright dipping adjustable and brightness is adjustable in visible waveband.
Due to the reliability of LED is high and mixed light after show that index is high, the accurate lambertian light source of LED that adopts it to make can be used as standard of luminous intensity device and standard LED brightness source is used, and can be used as the standard sources in a series of relevant criterion measurement mechanisms, the standard sources in display parameters standard measuring equipment as dynamic in flat-panel monitor.
Summary of the invention
The object of the invention is to, the accurate lambertian light source of a kind of LED is provided, it is to utilize PWM to regulate and control LED, realizes RGB three primary colours mixed light, regulates and controls by PWM, can change color point, in order to produce area source adjustable in visible waveband.
At temperature, eliminate the luminous color of LED and put temperature variant drift, delayed the aging of LED simultaneously.
The invention provides the accurate lambertian light source of a kind of LED, comprising:
One band radiator fan extruded aluminium section heat sink;
One drive circuit, described band radiator fan extruded aluminium section heat sink is positioned at above LED constant-current drive circuit;
One LED array, itself and LED constant-current drive circuit are electrically connected, and are positioned on LED constant-current drive circuit;
One optical dispersion compensation film, it is positioned on LED array;
One optical diffusing plate, it is positioned on optical dispersion compensation film, and fits with optical dispersion compensation film.
The invention has the beneficial effects as follows, it can produce adjustable area source in visible waveband.Because of high reliability and the high stability of LED, this area source can be used as the standard sources in standard measuring equipment.
Accompanying drawing explanation
For further illustrating concrete technology contents of the present invention, be described in detail as follows below in conjunction with embodiment and accompanying drawing, wherein:
Fig. 1 is the total schematic diagram of the system of the embodiment of the present invention.
Fig. 2 is heat sink schematic diagram in the embodiment of the present invention.
Fig. 3 is LED array schematic diagram in the embodiment of the present invention.
The specific embodiment
Refer to shown in Fig. 1-Fig. 3, the invention provides the accurate lambertian light source of a kind of LED, comprising:
One band radiator fan extruded aluminium section heat sink 10, this is positioned at the below of extruded aluminium section heat sink with the radiator fan in radiator fan extruded aluminium section heat sink 10, the described fin with radiator fan extruded aluminium section heat sink 10 is longitudinal matrix array structure (consulting Fig. 2).This band radiator fan extruded aluminium section heat sink 10, is operated under lower steady temperature LED array 30, has eliminated the luminous color of LED and has put temperature variant drift, has delayed the aging of LED simultaneously, has improved the stability of the accurate lambertian light source of this LED;
One drive circuit 20, described band radiator fan extruded aluminium section heat sink 10 is positioned at above LED constant-current drive circuit 20, and described drive circuit 20 is LED constant-current drive circuit, and this drive circuit 20 can be realized PWM and temperature reverse feedback regulation.Regulate and control by PWM, this drive circuit can change the color point of bright dipping after LED array 30 mixed lights, can produce adjustable light source in visible waveband;
One LED array 30, itself and LED constant-current drive circuit 20 are electrically connected, be positioned on LED constant-current drive circuit 20, described LED array 30 adopts red, blue, green three look low-power LEDs to rearrange, this is because low power LED has the longer life-span, can improve the stability of the accurate lambertian light source of this LED.Wherein 301 is R, represents ruddiness low-power LED, and 302 is G, represents green glow low-power LED, and 303 is B (consulting Fig. 3).Represent blue light low-power LED.Described LED array 30 comprises a temperature sensor 304, and for detection of the operating temperature of LED, the temperature inversion detecting is become the signal of telecommunication by sensor, and feed back in drive circuit 20.In the time that LED operating temperature is too high, drive circuit 20 is accepted the signal of telecommunication of sensor feedback, and drive current is reduced, so that LED array is operated under lower steady temperature;
One optical dispersion compensation film 40, it is positioned on LED array 30, this optical dispersion compensation film 40 for receive that LED array sends light, and color difference eliminating;
One optical diffusing plate 50, it is positioned on optical dispersion compensation film 40, and fit with optical dispersion compensation film 40, the material of this optical diffusing plate 50 is PMMA, PS, PC or frosted glass, the light that sees through optical dispersion compensation film is spread, make the light that sees through optical diffusing plate 50 be accurate lambertian distribution.This optical diffusing plate 50 is not less than 20 centimetres apart with LED array, to improve uniformity of light after the light mixed light that LED array 30 sends.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included in protection scope of the present invention.

Claims (8)

1. the accurate lambertian light source of LED, comprising:
One band radiator fan extruded aluminium section heat sink;
One drive circuit, described band radiator fan extruded aluminium section heat sink is positioned at above LED constant-current drive circuit;
One LED array, itself and LED constant-current drive circuit are electrically connected, and are positioned on LED constant-current drive circuit;
One optical dispersion compensation film, it is positioned on LED array;
One optical diffusing plate, it is positioned on optical dispersion compensation film, and fits with optical dispersion compensation film.
2. according to the accurate lambertian light source of the LED described in strong request 1, be wherein positioned at the below of extruded aluminium section heat sink with the radiator fan in radiator fan extruded aluminium section heat sink.
3. according to the accurate lambertian light source of the LED described in strong request 2, be wherein longitudinal matrix array structure with the fin of radiator fan extruded aluminium section heat sink.
4. according to the accurate lambertian light source of the LED described in strong request 1, wherein drive circuit is LED constant-current drive circuit, and this drive circuit can be realized PWM regulation and control.
5. according to the accurate lambertian light source of the LED described in strong request 1, wherein LED array is rearranged by red, blue, green three look low-power LEDs.
6. according to the accurate lambertian light source of the LED described in strong request 5, wherein LED array comprises a temperature sensor, for detection of the operating temperature of LED.
7. according to the accurate lambertian light source of the LED described in strong request 1, wherein optical dispersion compensation film for receive that LED array sends light, and color difference eliminating.
8. according to the accurate lambertian light source of the LED described in strong request 1, wherein the material of optical diffusing plate is PMMA, PS, PC or frosted glass, makes the light that sees through optical diffusing plate be accurate lambertian distribution.
CN201410049737.2A 2014-02-13 2014-02-13 LED quasi-Lambert area light source Pending CN103807647A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410049737.2A CN103807647A (en) 2014-02-13 2014-02-13 LED quasi-Lambert area light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410049737.2A CN103807647A (en) 2014-02-13 2014-02-13 LED quasi-Lambert area light source

Publications (1)

Publication Number Publication Date
CN103807647A true CN103807647A (en) 2014-05-21

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410049737.2A Pending CN103807647A (en) 2014-02-13 2014-02-13 LED quasi-Lambert area light source

Country Status (1)

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CN (1) CN103807647A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100931773B1 (en) * 2009-04-06 2009-12-14 (주)섬엘이디 Light module using led light source
CN101825231A (en) * 2009-03-06 2010-09-08 先进开发光电股份有限公司 Light-emitting diode bulb
CN101936483A (en) * 2009-07-01 2011-01-05 绎立锐光科技开发(深圳)有限公司 Backlight source and thinning method thereof as well as liquid crystal display device with backlight source
CN103080814A (en) * 2010-06-08 2013-05-01 瑞尔D股份有限公司 Stereoscopic liquid crystal display systems

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101825231A (en) * 2009-03-06 2010-09-08 先进开发光电股份有限公司 Light-emitting diode bulb
KR100931773B1 (en) * 2009-04-06 2009-12-14 (주)섬엘이디 Light module using led light source
CN101936483A (en) * 2009-07-01 2011-01-05 绎立锐光科技开发(深圳)有限公司 Backlight source and thinning method thereof as well as liquid crystal display device with backlight source
CN103080814A (en) * 2010-06-08 2013-05-01 瑞尔D股份有限公司 Stereoscopic liquid crystal display systems

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Application publication date: 20140521