WO2014117704A2

WO2014117704A2 - Led light source system and led lighting device

Info

Publication number: WO2014117704A2
Application number: PCT/CN2014/071525
Authority: WO
Inventors: 张权
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2013-01-31
Filing date: 2014-01-27
Publication date: 2014-08-07
Also published as: CN103968268A; WO2014117704A3; CN103968268B

Abstract

Disclosed are a LED light source system and a lighting system using the light source system, comprising a multi-color LED unit modular array that comprises multiple LED unit modules; a collimating lens array used to collimate the light rays emitted by the LED unit modules; condenser lens disposed at the rear of the light path of the collimating lens array and used to condense the light emitted from the collimating lens onto a pre-set surface, the LED chip set in each LED unit module imaging, via the superimposition of the collimating lens and the condenser lens, onto the pre-set surface to form a mixed light spot; the LED chips of any one color in the LED unit module are approximately evenly distributed so as to provide good uniformity for the mixed light spots. Hence, the light spots emitted by the light source system are more uniform, and each collimating lens collimates the LED chips of multiple colors while mixing the multiple colors, thereby reducing the bad visual effect caused by colored shadows.

Description

LED light source system and LED lighting device

Technical field

The present invention relates to the field of light sources such as projection and illumination, and more particularly to an LED light source system and an LED illumination device using the LED light source system.

Background technique

Conventional high-power lighting devices and light-illuminating devices generally use a gold halide discharge bulb as a light source. Since the gold halide discharge bubble is a white light source, when color light needs to be obtained, a filter is required before the metal halide discharge bubble to realize light output of different colors. The drawback of this kind of light source is that the metal halide discharge bubble has a low service life, ranging from several hundred hours to several thousand hours; the filter makes the projected color light have low saturation, is not bright, and the color of the obtained light is not rich.

High power LED Due to its advantages of safety, pollution-free and high service life, it has gradually become the first choice for development and application in the field of lighting, with a service life of up to 100,000 hours. Currently, high power LEDs will be As a stage lighting source has become possible, it has the advantages of long life, safe and pollution-free, high color saturation. However, currently a single LED The luminous flux of the chip is limited. In order to obtain high-intensity color light output, LED chips of different colors are usually arranged in an array to realize high-intensity light output. Existing LED lighting device illumination source In order to obtain uniform mixed light output using red (R), green (G), blue (B), and white (W) four-color LED chips, R, G, B, and W four-color LEDs are usually used. The chips are periodically alternately arranged in an array, as shown in Figure 1a. Figure 1b is an optical path diagram corresponding to the periodic unit of any RGBW four-color LED chip in Figure 1a, where 11R is a red LED Chip, 11G is green LED chip, 11B is blue LED chip, 11W is white LED chip, 12 is silica gel ball used in LED chip package, 13 It is a total internal reflection (TIR) lens, 15 is a condenser lens, 16 is a pattern disk, and the clear aperture 161 on it constitutes the aperture of the system, 17 is a projection lens for the aperture 161 The projection is imaged to a distance. Each TIR lens corresponds to an LED chip for shaping and collimating the light beam emitted by the LED chip. LEDs from different colors The beams of different colors emitted by the chip are shaped by the respective TIR lenses, and the uniform outgoing light is emitted from the TIR lens and incident on the front surface of the collecting lens 15. The incident beam is further condensed by the condensing lens 15 Converging onto the pattern disk 16 and being intercepted by the aperture 161, a uniform spot of a specific shape having the same shape as the pupil is obtained. This uniform spot is finally projected onto the stage by the subsequent projection lens 17.

However, such LED lighting devices have the following problems:

1. On a specific plane (projection lens 17 Uniform illumination can be obtained on the imaging plane, but significant color unevenness will appear on the front and rear planes of the plane;

2. A 'coloring phenomenon' occurs, that is, the opaque object on the illumination light path of the illuminating device is colored at the edge of the shadow on the illumination plane.

The above problems have caused user confusion in practical applications, but have not been solved so far.

technical problem

The invention provides an LED light source system comprising:

Multi-color LED unit module array including multiple LED unit modules, each LED unit module containing at least two colors The LED chip forms an LED chip set, and the LED chips in the LED chip set are closely arranged with each other;

a collimating lens array, each collimating lens being aligned with an LED unit module for the LED The beam emitted by the unit module is collimated;

a collecting lens for concentrating light emitted from the collimating lens array on a predetermined surface at a rear end of the optical path of the collimating lens array, each LED The LED chip set in the unit module is formed by the collimating lens and the collecting lens overlapping each other to form a mixed spot on the predetermined surface;

Among them, any color LED chip is in the LED Each location in the unit module has a substantially identical distribution such that the mixed spot has good uniformity.

Preferably, each LED unit module includes LEDs of each color used in the array of multi-color LED unit modules Chip.

Preferably, each of the collimating lenses in the collimating lens array is closely arranged, and the optical expansion of the outgoing beam of the collimating lens array is less than or equal to each LED The sum of the optical expansions of the unit modules.

The invention also provides an LED light source system comprising:

Multi-color LED unit module array comprising a plurality of LED unit modules, each of the LED unit modules including the multi-color LED The LED chips of each color used in the unit module array form an LED chip set, and the LED chips in the LED chip set are closely arranged with each other;

a collimating lens array, each collimating lens being aligned with an LED unit module for the LED The beam emitted by the unit module is collimated; the collimating lenses in the collimating lens array are closely arranged, and the optical expansion of the outgoing beam of the collimating lens array is less than or equal to the sum of the optical expansions of the LED unit modules;

a compound eye lens group, located behind the collimating lens array, for aligning the light beam emitted by the straight lens to homogenize;

A condensing lens for collecting light emitted from the fly-eye lens group at a predetermined surface at a rear end of the optical path of the fly-eye lens group.

Preferably, each LED unit module is the same.

Preferably, the LED unit module has four LED chips, and the four LED chips are arranged in a row shape.

Preferably, the LED chip is exposed to the air.

Preferably, the LED chip of at least one color is a multi-color LED chip, and the multi-color LED chip comprises two dominant wavelengths. In an LED chip, the difference between the two dominant wavelengths is greater than 10 nm and less than 30 nm.

Preferably, the LEDs of the two main wavelength LED chips included in the multi-color LED chip are respectively located The unit modules are staggered.

The invention also provides an LED lighting device comprising the above LED light source system; The optical path rear end of the light source system further includes a pattern disk placed at a focus of the collecting lens for receiving light emitted by the collecting lens, and a projection lens projecting the pattern light emitted from the pattern disk.

In this way, while achieving a more uniform spot of light emitted by the light source system, each of the collimating lenses has multiple colors of LEDs. The chip collimates and has the function of mixing multi-color light, so that the bad visual effect caused by the color image can be reduced.

DRAWINGS

Figure 1a is a layout view of different LED chips in the existing LED lighting device;

Figure 1b is a schematic view of the optical path of the existing LED lighting device;

2a is a layout view of an LED unit module according to Embodiment 1 of the present invention;

Figure 2b is a schematic diagram of any of the LED unit modules of Figure 2a;

3 is a schematic structural view of an LED lighting device of Embodiment 1;

4a is a layout view of an LED unit module according to Embodiment 2 of the present invention;

4b is another layout diagram of an LED unit module according to Embodiment 2 of the present invention;

4c is another layout diagram of an LED unit module according to Embodiment 2 of the present invention;

Figure 5a is a simulation result of the light emitted by the red LED chip on the predetermined surface when the first embodiment is applied;

Figure 5b shows the simulation results of the light emitted by the red LED chip on the predetermined surface when the third embodiment is applied.

Embodiments of the invention

The inventors have made targeted research on the problems in the background art. The inventor found that in the schemes shown in Figures 1a and 1b, R, G, B, W four-color LED chips have different spatial positions, and the beams of different colors emitted by them are shaped by their respective TIR lenses, and the outgoing beams do not coincide with each other, that is, from TIR. The spatial positions of the beams of different colors in the beam emitted by the lens are different. Take the four-color LED chip arranged in R, G, B, and W in Figure 1a as an example. The output light passes through the TIR lens. After shaping, the spatial color distribution of R, G, B, W in order will be formed, as shown in Figure 1b, where 14R represents the

red LED

11R and 14G represents green. The light beam generated by LED11G, 14B represents the light beam generated by blue LED11B, and 14W represents the light beam generated by white LED11W. This spatially unevenly distributed beam of light passes through a converging lens 15 After convergence, although the uniform beam can be formed at the pupil 161, the incident angles of the beams of different colors are different, and the difference of the incident angles will cause them to go from the pupil 161. The exit angle is different when exiting. The difference in spatial angular distribution of the different color beams will be transmitted to the beam 18 output from the projection lens 17, wherein 18W represents the output white light beam, 18B Indicates the output blue light beam, 18G represents the output green light beam, and 18R represents the output red light beam.

Essentially, the projection lens 17 is opposite to the aperture 161 Projection imaging is performed, and in the image plane, although a spot with uniform color and brightness can be obtained, at other positions deviating from the image plane, spots of different colors will be staggered in space to form a light distribution with uneven color distribution. It is due to the difference in the spatial angle distribution of the beams of different colors among the beams output from the system.

In short, in the existing system using R, G, B, W four-color LED as the illumination source, due to each LED The chip must be equipped with a TIR lens to make LEDs of different colors The chips are spaced apart in a spatial position by a certain distance. The spatial position of the chips is different, so that the spatial angular distributions of the different color beams in the output beam are different, which causes the problem of the spot color unevenness of the projected beam at a position deviating from the image plane. On the other hand, due to the different spatial position and angular distribution of different colored lights, the opaque objects on the illumination light path of the illumination device will have different occlusions for different colors of light, which is the essential cause of the 'color problem'.

The invention is further described below in conjunction with specific embodiments.

Embodiment 1

Fig. 2a is an arrangement diagram of LED chips in the LED light source system of the present embodiment. In this embodiment, LEDs of different colors The chips form a chipset that is fixed to a unit to form an LED unit module 21, and the plurality of LED unit modules form an array of multi-color LED unit modules. Where each LED The unit modules all contain LED chips of each color used in the array of multi-color LED unit modules. Figure 2b is an arrangement diagram of different LED chips on any of the LED unit modules in Figure 2a, wherein 21 is an LED unit module consisting of 4 different LED chips, including a red LED chip 21R, a green LED chip 21G, and a blue LED. The chip 21B and a white LED chip 21W are attached to the same thermally conductive substrate 213. Thermally conductive substrate 213 A heat conductive ceramic such as alumina or aluminum nitride may be used as long as it has a sufficiently high thermal conductivity and an insulating surface layer.

FIG. 3 is a schematic structural view of the LED light source system of the embodiment. Wherein, in addition to the LED unit module 21 In addition, a collimating lens array is also included. Each of the collimating lenses 22 in the collimating lens array is aligned with an LED unit module 21 for the LED unit module 21 The emitted beam is collimated. Also included is a fly-eye lens group 23 disposed behind the collimating lens array for aligning the light beam emitted from the straight lens 23 for homogenizing; further comprising a compound eye lens group 23 A collecting lens 25 for collecting the light emitted from the fly-eye lens group 23 on the predetermined surface 261 at the rear end of the optical path. Among them, the predetermined surface 261 is often the focal plane of the collecting lens 25.

In this embodiment, each LED unit module contains four LED chips of different colors (including 21R and 21G). , 21B and 21W ), the four LED chips and the spacing between the chips together constitute the light source area of the entire LED unit module. Four LEDs The chips are arranged closely to each other in a field shape. At this time, the light source area is the smallest and a symmetrical structure is formed, and the spatial uniformity of the outgoing beam is best after the collimating lens 22 is collimated. More preferably, these four LEDs The pads on the surface of the chip are located on the outside of the field, which is good for gold wire. Of course, in practical applications, the field type is only a possible arrangement, and other arrangements are possible; and if the number of LED chips is not 4 The pieces will inevitably be arranged in other forms.

The purpose of closely aligning the LED chips with each other is to reduce the optical expansion of the light source system on the one hand, and to make the LEDs on the other hand. The gap between the chips is as small as possible, which is beneficial to the uniformity of the light spot of the light source system. In practice, due to the limitations of the LED packaging process, the spacing of the LED chips often cannot be 0. , but a small distance such as 0.1~0.2mm (for 1mm LED chips).

In the LED lighting device of the present embodiment, the collimating lens 22 is in the pair of LED unit modules 21 When the outgoing beam is collimated, it also enables the multi-color LED illumination emitted by the LED unit module to be mixed. For each LED unit module, due to the four colors of R, G, B, W The LED chips face the same collimating lens, and they output R, G, B, W After the four color beams are collimated and mixed by the collimating lens, a uniform color uniform parallel light is synthesized (although it is not ideal parallel light, but has a certain divergence angle, but its divergence angle is small, For example ± 9 °, so it can be treated as approximately parallel light). The beams of different colors in the parallel beam overlap each other in space, and their corresponding angular distributions are also approximately the same, and then are homogenized by the fly-eye lens group 23 and then concentrated by the collecting lens 25 to the pupil. At 261, the projection lens 27 images the image of the pupil 261 to a distant location. During the propagation of the entire beam, R, G, B, W The beams of the four colors are always coupled together, so in the final output of the light source 28, the spatial position and the exit angle of the beams of different colors will be substantially the same. Essentially, even R, G, B, W The four-color LED chips are closely arranged in a row shape, and since their spatial positions are still different, the difference in spatial position causes them to emit different colors of light beams through the collimating lens 22 The angular distribution of the space after collimation will also vary slightly, but the area of each LED chip is small (usually only 1mm x 1mm) And the different chips are closely spaced from each other, so the difference in beam angular distribution of different colors caused by the difference in spatial position can be ignored.

In the LED lighting device shown in this embodiment, as shown in FIG. 3, each of the collimating lenses 22 in the collimating lens array They should be arranged closely so that there is no gap between adjacent collimating lenses 22. When the respective collimating lenses are closely arranged, the light emitted from the LED chips of each color is emitted from the respective collimating lenses 22 When collimated, they will be connected to each other in a piece. These collimated beams are also projected into one piece when projected by the projection lens 27, and fill the entire luminous surface. Of course, adjacent collimating lenses 22 can also be made for tolerance and mounting considerations. There is a certain gap between them, which should also fall within the scope of protection of the present invention.

This embodiment also has a plurality of LED chip arrays as compared with the embodiment shown in FIG. 1b, but in the present embodiment, these are further The LED chip is divided into a plurality of LED unit modules, and each LED unit module contains LED chips of various colors, thereby making each LED The unit modules can emit light beams of various colors; at the same time, each LED unit module is provided with a collimating lens to collimate the light beam emitted from the LED unit module, compared to each LED in the prior art. The use of a collimating lens in the chip can reduce the number of collimating lenses used, facilitate installation, and achieve light mixing of different color beams. . At the same time, since all the collimating lenses are connected together to form a collimating lens array, the light beams of each color are filled with the entire light emitting surface, and have close spatial distribution and angular distribution, which makes the projection spot of the beams of different colors not only In the image plane, even at other positions deviating from the image plane at a certain distance, it is ideally coincident, thereby obtaining a spot of uniform color and brightness. In addition, since the spatial angular distribution of the different color beams in the output beam is the same, there is no coloring phenomenon.

In this embodiment, each of the LED unit modules 21 is the same, which ensures that each LED unit module contains various colors. The LED chip enables each LED unit module to emit light beams of various colors; at the same time, the same LED unit module makes preparation for production materials simple.

In applications where high brightness is required, it is advantageous for projector light source applications or stage light applications, etc. There is a limit to the etendue of the beam emitted by the source system, so that the optical expansion of the collimated beam emerging from the collimating lens 22 is as small as possible. Because each collimating lens 22 The smaller the optical spread of the outgoing beam, the more such a beam can pass through the aperture, and correspondingly more LED unit modules 21 can be provided, the greater the luminous intensity of the LED light source system.

For each collimating lens, the etendue of the output beam is the product of the area of the collimating lens and the square of the sine of the divergent half-angle of the collimated beam; the optical expansion of the LED unit module is equal to its source The product of the area and the sine square of its illuminating half angle (typically 90 degrees). In this embodiment, since the four LED chips in each LED unit module are closely arranged in a row shape, the spatial spacing between the chips is negligible, the light source area is the smallest, and the optical expansion amount is also minimized. In addition, in order to further reduce the optical expansion of the LED unit module, it is preferable to expose the LED chip contained in each LED unit module directly to the air without using a transparent material such as epoxy or silicone, because When the LED chip is packaged using a transparent material having a refractive index n, the etendue is expanded by a factor of ² with respect to the case where the chip is exposed to the air. Preferably, the amount of optical expansion of the beam after the collimation is controlled to be less than or equal to the optical expansion of the output beam from the LED unit module, which is advantageous for the luminous intensity of the LED light source system. For the entire collimating lens array, the etendue of the outgoing beam is the area of the entire collimating lens array multiplied by the square of the divergent half-angle sine of the collimated beam (the entire area of the collimating lens array includes not only all the quasi-quantities) The sum of the areas of the straight lenses also includes the spatial gap between the collimating lenses, which preferably should be less than or equal to the sum of the optical spreads of the individual LED unit modules.

In this embodiment, by arranging different LED chips in each LED unit module closely to each other, and simultaneously making each LED The collimating lens 22 corresponding to the unit module is arranged in parallel, thereby minimizing the optical expansion of the light source system and improving the brightness of the output light.

Preferably, a collimating lens having no significantly expanded optical expansion is used, including a convex lens that collimates with the refraction of light, and a compound parabolic concentrator (Compound Parabolic) Concentrator, CPC), and a tapered integrator rod that is similar to the principle of a compound parabolic concentrator (described in detail at the end of this embodiment); total reflections that are often used in the field should be avoided as much as possible ( The TIR) collection lens (the TIR lens 13 in Figure 1b is an example). The total reflection collection lens can theoretically collect LEDs The full-angle light is emitted, but it has a significant expansion of the optical expansion, which is often more than 5 times larger.

In the light source system of the embodiment, each LED unit module includes a plurality of LED chips of different colors to form an LED. The chipset, the LED chipset in each LED unit module is superimposed on the predetermined surface 261 by the collimating lens and the collecting lens to form a mixed spot, so the LED is In the case of a light source system, the spatial distribution of the mixed spot is not uniform (refer to Figure 2a). It can be seen that the upper left corner of the spot is red, the upper right corner is green, the lower left corner is white, and the lower right corner is blue). In order to obtain a spot having a uniform color space distribution, a fly-eye lens group 23 is further provided in the light source system of the present embodiment. To achieve even light.

In the present embodiment, the fly-eye lens group 23 is disposed on the collimator lens 22 It is then used to homogenize the beam that exits it, thereby improving the uniformity of the spatial distribution of the beams of different colors. In order to achieve a good light-shaping effect, it is preferable to ensure that the size of each collimating lens in the collimating lens array is the size of each microlens in the fly-eye lens. 4 times or more. Obviously, the smaller the size of each microlens in the fly-eye lens, the better the uniformity effect. By providing a fly-eye lens group 23 after the collimator lens 22 At this time, the entire light source system is equivalent to superimposing imaging of each microlens in the fly-eye lens. Preferably, each of the microlenses in the fly-eye lens has a regular hexagonal structure, and on the one hand, the adjacent microlenses are ensured. The seamless arrangement, on the other hand, matches the projected image with the circular projection spot.

In other applications of this embodiment, in order to further improve the uniformity of the spatial distribution of the projected spot, it is also possible to An integrator rod is disposed between the unit module and the collimating lens to homogenize the light beam emitted from the LED chip. The integrator rod includes an entrance port and an exit port. The light inlet is close to the LED unit module The light emitting surface of the chip is disposed such that most of the light exiting the LED enters the integrator; the light exit is located near the focal plane of the collimating lens 22 such that its output beam passes through the collimating lens 22 After collimation, it can become ideal parallel light. At this time, the light-emitting surface of the integrator rod is equivalent to the light source surface of the system. This makes the LED light source system more uniform due to the mixing effect of the integrator rods on the light.

In practical applications, the integrator rod can also be a tapered square rod with a light exit area larger than the entrance aperture area. When the light exits of the tapered square rods are large enough to be adjacent to each other, the light beams emerging from the light exits of the tapered square rods will also be connected into one piece, and the subsequent collimating lens will no longer be needed. However, in order to achieve a good light mixing effect, the tapered square bar needs to have a sufficient length.

In this embodiment, each LED unit module includes LEDs of each color used in the multi-color LED unit module array. The chip, of course, allows each color of light to be distributed to each of the LED unit modules, so that each color of light fills the entire illuminated surface, thereby completely eliminating the undesirable visual effects caused by the color problem. In fact, as long as each The LED unit modules each contain LEDs of at least two of the colors used in the multi-color LED unit array array The chip can reduce the bad visual effect brought by the color image compared with the prior art. This is very practical in some occasions where the requirements for coloring are not high.

Embodiment 2

In the first embodiment, in order to realize spatial uniformization of the projection spot, a fly-eye lens is used in the light source system, but the use of the fly-eye lens is costly and complicates the system; this embodiment will use another way to homogenize Instead of a compound eye lens.

In this embodiment, the LEDs in each LED unit module The chipset is formed by the collimating lens and the collecting lens overlapping each other to form a mixed spot on the predetermined surface, and the distribution of the LED chips of different colors in the LED chip set in each LED unit module is adjusted. The LED chips of any one color have substantially the same distribution at each position in each LED unit module, so that the mixed spot has good uniformity. For example, as shown in Figure 4b, the blue LED The chip (labeled B in the figure) has four different positions in each LED unit module, which are the upper left corner, the lower left corner, the upper right corner and the lower right corner, and the number of times the blue LED chip is approximately the same at each position. Blue The number of LED chips in the upper left corner is 5, the number in the lower left corner is 4, the number in the upper right corner is 5, and the number in the lower right corner is 5; the red LED chip (identified as R in the figure), green The LED chip (labeled as G in the figure) and the white LED chip (identified as W in the figure) also satisfy this condition, so that although a certain color of the LED chip is in each LED The number of positions of the unit module is not exactly equal, but because the difference is not large, the unevenness of the spot by the human eye is not obvious, so each LED The superposition of the projection spots of the unit modules will have good uniformity.

In another LED light source system of this embodiment, in order to make each color of the LED chip in each LED Each position in the unit module has substantially the same distribution, and each LED unit module is fixed at a different angle with respect to the plane of the light source. Preferably, each LED is made The unit modules are rotated at different angles with respect to their respective centers, and these different rotation angles are evenly distributed in the range of 0-360 °, and the LED chips of each color are also ensured in the respective LEDs. Each location in the unit module has approximately the same distribution, see Figure 4a. It can be understood that the example shown in Figure 4b is to have all the different LEDs. The unit modules are divided into four categories according to the direction of placement (the four types of orientations in the plane of the light source correspond to 0 °, 90 °, 180 ° and 270, respectively). °), each type of orientation is perpendicular to the other two types of placement, and each type contains the same number of LED unit modules. If each LED unit module contains only two colors of LEDs The chip can also be divided into two types according to the direction of the placement of the LED unit modules (the two types of orientation in the plane of the light source correspond to 0 ° and 180 ° respectively), in these two types of LEDs In the unit module, the color of the LED chip at the corresponding position is just the same. For those skilled in the art, depending on the LED used The number of unit modules can be more flexible, but the nature is the same, as long as the LED chip of each color is in each LED in the entire light source plane. Each position in the unit module has substantially the same distribution.

The example shown in Figures 4a and 4b is to use the same LED unit module to rotate the LEDs of each color. The chip has approximately the same distribution at each location in each LED unit module. This has the advantage of requiring only one LED unit module to be purchased, which is convenient and inexpensive. Of course, you can also use different LEDs. Unit modules (here, the different LED unit modules mean that the LED unit modules cannot be rotated by the same, the difference is due to the different LEDs inside the LED unit modules. The relative positions between the chips are different.) The layout of each LED unit module can be separately arranged. By adjusting the arrangement of LED chips of different colors, the LED chips of each color can be realized in each. Each location in the LED unit module has approximately the same distribution. For example, the layout of another LED unit module as shown in Fig. 4c, in which four LED unit modules are drawn, in the upper left corner The LED chipset in the LED unit module is arranged along the clockwise R-G-W-B. The LED chipset in the upper right corner is arranged in a clockwise manner along the clockwise R-W-G-B. The arrangement of the LED chipsets in the lower left corner of the LED unit module is along the clockwise R-B-W-G, and the arrangement of the LED chipsets in the lower right corner of the LED unit module is clockwise. R-B-G-W, it can be seen that these four LED unit modules are different, but they also implement 'Every color LED chip in each LED Each location in the unit module has a substantially identical distribution' purpose.

In this embodiment, by adjusting the distribution of LED chips of different colors in each LED unit module, any color is The LED chips have approximately the same distribution at various locations in each LED unit module. Thus, even if the color distribution of each LED unit module's projection spot is uneven, when all LEDs After the projection spots of the unit module are superimposed, the color distribution can be evenly distributed.

Embodiment 3

In the above two embodiments, for each color of the LED chip, since the chip is off-axis relative to the collimating lens (Fig. 3) The LED chip 211 shown is offset from the optical axis 221 of the collimating lens 22, and the projection spot of the single chip is eccentric with respect to the central optical axis of the entire light source system, which would be LED The uniformity of the spot formed by the light source system on the predetermined surface adversely affects.

In the present embodiment, in combination with the use of the fly-eye lens group in the first embodiment on the basis of the second embodiment, the uniform light effect is better. Figure 5a In the case of a fly-eye lens group, the result of simulating the red LED chip for the arrangement of the LED unit modules shown in Fig. 2a; Fig. 5b is also in the case of a fly-eye lens group, The arrangement of the LED unit modules shown in 4b is the result of simulating the red LED chip. It can be seen from the figure that in the case of using a fly-eye lens group, each LED is simultaneously The rotation direction of the unit module is adjusted so that the LED chips of any color have substantially the same distribution at each position in each LED unit module, and a more uniform light field output can be obtained.

In the above embodiments of the present invention, although it is emphasized that the four LED chips in the LED unit module are R, G, B, W four different colors, in fact, it can also contain only 3 or 2 color LED chips, for example, a red LED chip, two green LED chips and a blue LED LED unit module composed of chips; at the same time, different colors also include white light of different color temperature, for example, LED unit module contains white LEDs of 3200K and 6500K color temperature Chip. In addition, the arrangement of the four LED chips is not limited to the shape of a field, but may be any other arrangement. In order to make the optical expansion of the entire light source system small, it is preferable to make a difference in each LED unit module. The LED chips are arranged closely to each other. In addition, the number of chips in the LED unit module is not limited to four, and may include more or less.

In the present invention, a circuit control module may be further included to control LEDs of different colors in each LED unit module. The chip is individually controlled to control the light-on state and output intensity of each color beam, thereby controlling the color, brightness, and color temperature of the projected spot.

In the above three embodiments, each color LED chip refers to a single LED chip. Actually, The LED chip having at least one color may be a multi-color LED chip, and the multi-color LED chip comprises two LED chips of dominant wavelength, and the difference between the two main wavelengths is greater than 10 nm and less than 30 Nano. For the illumination of the LED chips of the two main wavelengths, the human eye can distinguish the difference in the color of the luminescence, but such a color difference is not obvious to the human eye.

It can be seen from the descriptions of Embodiments 1 to 3 that the LED with uniform color and no color can be realized by applying the invention. Light source system. In the experiment, the inventors found that the LED light source system is sufficiently uniform that even if a multi-color LED chip is used, the human eye will not be aware of the complex color LED. The effect of the color difference of the chip. At the same time, the application of the multi-color LED chip can make the LED light source system have a larger illumination spectrum coverage and a higher color rendering index.

Preferably, the LED light source system further includes a color adjustment module, and the color adjustment module receives the double color LED The color adjustment signal corresponding to the chip controls the illumination power of the two main wavelength LED chips included in the multi-color LED according to the target color information carried by the color adjustment signal. For example, for red, it can include Red LEDs at 618nm and 635nm The chip, although it has a color difference, is not obvious. At this time, the red projection beam having different dominant wavelengths can be generated by adjusting the relative intensities of the two by the color adjustment module.

On the other hand, the LEDs of the two main wavelength LED chips corresponding to the multi-color LED chip are respectively located. The unit modules are staggered with each other so that the light of the two main wavelengths can be more evenly mixed and less visible to the human eye.

With the embodiment, in the LED light source system of the present invention, white LED chips of different color temperatures may be included, for example, 3200K. And 6500K two color temperatures, the LEDs of the two different color temperature LED chips The unit modules are staggered with each other to ensure uniform light mixing, and the relative intensity of the two can be adjusted by the adjustment module to generate projection spots of different color temperatures. This is a common knowledge for those skilled in the art and will not be described again.

The present invention also protects an LED lighting device comprising the LED light source system described above, The optical path rear end of the light source system further includes a pattern disk placed at a focus of the collecting lens for receiving light emitted by the collecting lens, and a projection lens projecting the pattern light emitted from the pattern disk.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformations made by the description of the invention and the drawings are directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

An LED light source system comprising:

Multi-color LED unit module array, including multiple LED unit modules, each LED unit module comprising at least two colors of LED chip formation LED chipset, LED chips in the LED chipset are closely arranged with each other;

a collimating lens array, each collimating lens being aligned with an LED unit module for the LED The beam emitted by the unit module is collimated;

a concentrating lens at a rear end of the optical path of the collimating lens array for concentrating light emitted from the collimating lens array on a predetermined surface, and an LED in each LED unit module The chipset is formed by the collimating lens and the collecting lens overlapping each other on the predetermined surface to form a mixed spot;

Wherein, the LED chips of any one color have substantially the same distribution at each position in the LED unit module, so that the mixed light spots have good uniformity.
The LED light source system according to claim 1, wherein each of the LED unit modules comprises the multicolor LED LED chip of each color used in the unit module array.
The LED light source system of claim 1 wherein the collimating lenses in the array of collimating lenses are closely spaced.
LED according to claim 1 The light source system is characterized in that it further comprises a fly-eye lens group, which is located behind the collimating lens array for aligning the light beam emitted by the straight lens to perform uniform light.
An LED light source system comprising:

Multi-color LED unit module array comprising a plurality of LED unit modules, each of the LED unit modules including the multi-color LED The LED chips of each color used in the unit module array form an LED chip set, and the LED chips in the LED chip set are closely arranged with each other;

A collimating lens array comprising a plurality of closely aligned collimating lenses, each collimating lens being aligned with an LED unit module for the LED The beam emitted by the unit module is collimated;

a compound eye lens group, located behind the collimating lens array, for aligning the light beam emitted by the straight lens to homogenize;

A condensing lens for collecting light emitted from the fly-eye lens group at a predetermined surface at a rear end of the optical path of the fly-eye lens group.
The LED light source system according to any one of claims 1 to 5, wherein each of the LED unit modules is the same.
The LED light source system according to any one of claims 1 to 5, wherein said LED unit module has four LEDs The chip, and the four LED chips are arranged in a row shape.
The LED light source system according to any one of claims 1 to 5, wherein the LED chip is exposed to the air.
The LED light source system according to any one of claims 1 to 5, wherein the optical spread of the outgoing beam of the collimating lens array is less than or equal to each The sum of the optical expansions of the LED unit modules.
The LED light source system according to any one of claims 1 to 5, characterized in that the at least one color LED chip is a multi-color LED The chip, the multi-color LED chip includes two main wavelength LED chips, the difference between the two main wavelengths is greater than 10 nm and less than 30 nm.
The LED light source system according to claim 10, wherein the two color LEDs of the dual color LED chip comprise The LED unit modules on which the chips are located are staggered.
An LED lighting device characterized by comprising

The LED light source system according to any one of claims 1 to 11;

In the LED The optical path rear end of the light source system further includes a pattern disk placed at a focus of the condensing lens for receiving light emitted by the condensing lens, and a projection lens projecting the pattern light emitted from the pattern disk.