TWM482090U - Light emitting device and projection system - Google Patents

Description

Light-emitting device and projection system

The present invention relates to the field of illumination and display technology, and more particularly to a light-emitting device and a projection system.

Laser phosphor powder technology is a new type of high-brightness light source solution, which can be widely used in projection display and other fields. The laser phosphor powder technology uses a laser to excite fluorescent powder to generate a laser as a light source. Due to the high optical power density of the laser, the optical power density of the laser generated by the excitation phosphor is also high, and the light source can generate a high-intensity laser or a mixed light of the laser and the excitation light.

Please refer to the first figure, which is a structural view of a light-emitting device 1' which is conventional. As shown in the first figure, the wavelength conversion device includes a first laser light source 110, a second laser light source 120, a reflective color wheel 130, a scattering device 140, a first filter 150, a second filter 160, a lens 170, The homogenizing rod 180. The first laser light source 110 emits 445 nm blue laser, and the 445 nm blue laser color is purple. Although it is not suitable for direct projection display, the efficiency of exciting the fluorescent powder is high, and the 445 nm blue laser passes through the first filter. The reflection of the sheet 150 is incident on the reflective color wheel 130 to produce a yellow laser. The yellow received laser light emitted from the color wheel 130 transmits the first filter 150 to the second filter 160. The second laser source 120 emits a 462 nm blue laser, and the 462 nm laser color is suitable for direct display of blue light in a projection display. The 462 nm blue laser is transmitted through the scattering device 140 and then incident on the second filter 160. The second filter 160 sequentially combines the incident 462 nm blue laser light and the yellow laser light into the same optical path to the lens 170 and the light homogenizing rod 180 to obtain white light mixed light.

Thus, through the above, we can know that the conventional light-emitting device 1' still has disadvantages and disadvantages: 1. The yellow light component and the blue light component in the white light mixed light emitted by the light-emitting device 1' are not uniformly mixed, and color cast may occur. phenomenon. In addition, the structure of the entire light-emitting device 1' is relatively complicated and not sufficiently compact.

Therefore, in view of the fact that the conventional illuminating device 1' still has shortcomings and deficiencies, the creator of the present case has vigorously researched and created, and finally developed a illuminating device and projection system of the present invention.

The main purpose of the present invention is to provide a light-emitting device and a projection system, which are a first laser light source, a second laser light source, an optical path adjusting device, a first lens, a second lens, a wavelength conversion device, a scattering device is integrated with a wave plate, and thus, by a wavelength conversion device The optical path to the first lens is equal to the optical path of the scattering device to the second lens, the optical paths of the first lens and the second lens to the optical path adjusting device are equal, and the first lens and the second lens are the same, and the collimated injection The spot where the first laser is focused by the first lens on the surface of the wavelength conversion device and the second laser that is collimated into the second laser are focused on the surface of the scattering device. In addition, the reflective scattering device can scatter the incident light into a Lambertian distribution, and the laser light emitted by the wavelength conversion device is also a Lambertian distribution, so that the laser emitted by the wavelength conversion device and the second laser emitted by the scattering device pass through the first After the lens and the second lens are collimated, light beams having the same shape, the same light intensity distribution, and the same cross-sectional area are formed. Moreover, after the optical path adjusting device, the beams overlap, so that the two spots coincide, and after the optical paths are combined, the light distribution of the optical path adjusting device is more uniform. At the same time, the splitting of the first laser and the second laser before scattering and the combining of the laser and the scattered second laser are realized by only one optical path adjusting device, which improves the compactness of the light-emitting device.

Therefore, in order to achieve the above object of the present invention, the creator of the present invention proposes a light-emitting device and a projection system, comprising: a first laser light source for emitting a first laser; and a second laser light source for emitting a second laser; an optical path adjusting device for receiving the first laser and the second laser incident in the same direction, and causing the first laser and the second laser to be emitted along different optical paths; a first lens for receiving the first laser emitted from the optical path adjusting device; a second lens for receiving the second laser emitted from the optical path adjusting device; a wavelength converting device having a a first surface, wherein the first surface is configured to receive the first laser emitted from the first lens, thereby converting the first laser into a laser beam and emitting the laser light from the first surface to the first surface a lens; a scattering device having a second surface, the second surface for receiving the second laser emitted by the second lens, wherein the scattering device scatters the second laser and scatters The second laser is emitted from the second surface to the first lens; and wherein the first lens focuses the first laser to the wavelength conversion device, and the laser beam is emitted by the wavelength conversion device Exiting to the optical path adjusting device, wherein the second lens focuses the second laser to the scattering device, and collimates the scattered light emitted by the scattering device to the optical path adjusting device; wherein the wavelength conversion device The optical path to the first lens is equal to the optical path of the scattering device to the second lens, and the optical path of the first lens and the second lens to the optical path adjusting device is equal; and the first lens is collimated The second laser beam that is emitted by the laser and the scattering device is collimated from the second lens, and is merged into the same optical path by the optical path adjusting device, and is combined The laser light after the light coincides with the optical path of the second laser.

<this creation>

1‧‧‧Lighting device

P‧‧‧ polarized light

S‧‧‧ polarized light

L1‧‧‧ first laser

L2‧‧‧second laser

L3‧‧‧ by laser

210‧‧‧First laser source

220‧‧‧second laser source

230‧‧‧wavelength conversion device

231‧‧‧wavelength conversion layer

232‧‧‧reflective layer

233‧‧‧ drive

240‧‧‧scattering device

241‧‧‧scattering layer

242‧‧‧ drive

250‧‧‧Light path adjustment device

260‧‧‧first lens

270‧‧‧second lens

280‧‧‧ wave plate

231a‧‧‧ first surface

241a‧‧‧ second surface

<知知>

1'‧‧‧Lighting device

110‧‧‧First laser source

120‧‧‧second laser source

130‧‧‧Reflective color wheel

140‧‧‧scattering device

150‧‧‧first filter

160‧‧‧Second filter

170‧‧‧ lens

180‧‧‧Dozing rod

The first figure is a structural diagram of a light-emitting device that is conventionally used; the second figure is a schematic structural view of the light-emitting device of the present invention; the third figure is a light transmittance curve of the filter; and the fourth figure is a wavelength conversion device and a scattering device The position of the light transmission curve of the time-varying filter.

In order to more clearly describe a light-emitting device and a projection system proposed by the present invention, a preferred embodiment of the present invention will be described in detail below with reference to the drawings.

Please refer to the second figure, which is a schematic diagram of the structure of the light-emitting device of the present invention. As shown in the figure, the illuminating device 1 of the present invention comprises: a first laser light source 210, a second laser light source 220, a wavelength conversion device 230, a scattering device 240, an optical path adjusting device 250, and a first lens 260. a second lens 270. The first laser light source 210 can emit the first laser light L1, and the second laser light source 220 can emit the second laser light L2. Specifically, the first laser L1 is a 445 nm blue laser, which can be used to excite the wavelength converting material to obtain an excited light; the second laser L2 is 462 nm blue. Light laser can be used as a blue component of the projection display. For the convenience of assembly, the first laser source 210 and the second laser source 220 are located in the same light source module and are located on the same plane of the light source module such that the first laser L1 and the second laser L2 are emitted in the same direction.

Continuing to refer to the second diagram, the wavelength conversion device 230 includes a wavelength conversion layer 231 and a reflective layer 232, and the wavelength conversion layer 231 includes a yellow wavelength conversion material that can receive excitation light and convert it into yellow laser light, and directly The light emitted from the wavelength conversion device 230 is a Lambertian distribution. The wavelength converting material in this embodiment is a phosphor powder, such as YAG phosphor powder, which absorbs blue light and is stimulated to emit yellow laser light. The wavelength converting material may also be a material having wavelength conversion capability such as a quantum dot or a fluorescent dye, and is not limited to the fluorescent powder. The first surface 231a of the wavelength conversion layer 231 receives the incident excitation light, and the reflective layer 232 is disposed on the surface of the wavelength conversion layer 231 opposite to the first surface 231a, and can reflect the excitation light incident on the surface thereof or The laser light L3, therefore, the received laser light L3 generated by the wavelength conversion layer 231 is also emitted from the first surface 231a. The reflective layer 232 here is specifically a high anti-aluminum sheet, and the high anti-aluminum sheet can also function as a substrate to support the wavelength conversion layer 231. However, in the case where the wavelength conversion layer 231 itself is sufficiently rigid (for example, the wavelength conversion layer is formed by doping the phosphor powder in the transparent glass), the wavelength conversion layer 231 does not require a substrate for supporting, and the reflective layer 232 at this time. It can be plated on the surface of the wavelength conversion layer 231 and also has a reflection effect. And in When the thickness of the wavelength conversion material in the wavelength conversion layer 231 is sufficient, the reflective layer 232 may not be provided.

Since the emitted light of the wavelength conversion device 230 is a Lambertian distribution, in order to make the distribution of the emitted light of the scattering device 240 coincide with the outgoing light of the wavelength conversion device 230 to obtain a relatively uniform mixed light, the scattering device 240 must also be capable of injecting. The second laser L2 scattering becomes a Lambertian distribution. After extensive experimentation and testing, we have found that only a reflective scattering device can scatter the second laser L2 to a near Lambertian distribution. This is because the transmissive scattering device generally used (such as the scattering device 140 in the first figure) propagates in the direction of incident light due to the emitted light, and there is always a local region with little scattering in the scattering device even with pinholes. The pin hole allows the incident laser to form the emitted light with little or no scattering (directly through the pinhole). This part of the light still has a strong directivity and does not follow the Lambertian distribution. However, if the thickness or density of the scattering device is increased to completely prevent the occurrence of pinholes, the transmittance of incident light is greatly reduced to reduce the efficiency of the scattering device. Correspondingly, the reflected light of the reflective scattering device is opposite to the incident light, and the incident light must be deflected and reflected to change direction to form the emitted light, and increasing the density or thickness of the reflecting device does not reduce the efficiency. Reflective scattering devices are therefore a must for high efficiency, Lambertian scattering. Wherein, the reflective scattering device 240 includes a scattering layer 241, the scattering layer 241 is provided with a scattering material, and the second laser beam L2 is incident from the second surface 241a of the scattering device 240, and can be scattered into a Lambertian distribution also from the second surface 241a. Shoot out. The scattering device 240 can also eliminate the coherence of the second laser L2. The scattering material may be disposed on a reflective substrate such that light transmitting the scattering material is reflected by the reflective substrate to re-enter the scattering material and be scattered.

Referring to the second figure, in order to realize the compact structure of the light-emitting device of the present invention, the light source module and the scattering device 240 are located on both sides of the light path adjusting device 250, and the second laser L2 transmitted light path adjusting device is incident on the scattering device 240; The light source module and the wavelength conversion device 230 are located on the same side of the optical path adjusting device 250, and the first laser L1 is incident on the wavelength conversion device 230 through the reflection of the optical path adjusting device 250. Thus, the light source module, the scattering device 240, and the wavelength conversion device 230 are surrounded on three sides of the optical path adjusting device 250, and the other surface is used for light emission, so that the structure is the most compact. However, in order to achieve normal operation of the structure, the optical path adjusting device 250 simultaneously realizes the first laser L1 and the second laser L2, the first laser L1 and the received laser light L3, the second laser L2 before scattering, and the second laser after scattering. L2 three groups of light splitting. Due to the difference in wavelength, the first laser L1 and the second laser L2, the first laser L1, and the received laser L3 can use a filter to distinguish the optical path, and the second laser L2 before scattering and the second laser L2 after scattering In the same way, it is impossible to distinguish the optical path by a filter using the difference in wavelength.

In the present embodiment, the optical path adjusting device 250 distinguishes between the polarization states of the second laser L2 before scattering and the second laser L2 after scattering. According to the relevant optical knowledge, when the polarization direction is included When the straight p-polarized light and the s-polarized light are incident perpendicularly to the filter, the filter is the same for the p-polarized light and the s-polarized light, wherein the p-polarized light has a polarization direction in the incident direction. The polarized light in the plane formed by the direction of reflection, and the s-polarized light is a polarized light whose plane of polarization is perpendicular to the plane formed by the incident direction and the reflected direction. However, when the incident angle of the light containing the p-polarized light and the s-polarized light is increased in the filter, the stop band of the filter against the light will drift toward the short-wave direction due to the action of the film layer of the filter, and The stop band of the s-polarized light becomes a resistive bandwidth of the p-polarized light such that the transmittance curve of the p-polarized light and the s-polarized light is shifted by a certain distance from the edge of the pass band. As the incident angle incident on the filter is larger, the stop band width of the s-polarized light and the stop band width of the p-polarized light become larger, and the distance of the pass band edge of the transmittance curve corresponding to the p-polarized light and the s-polarized light is larger. Big. The wavelength corresponding to the position at which the transmission band edge of the s-polarized light and the p-polarized light is shifted by the edge of the band can be changed by the film layer design. Therefore, the optical path adjusting device 250 can realize the optical path for the second laser L2 before scattering and the second laser L2 after scattering by using different reflectances of the filter for incident light of different polarization states.

Specifically, the optical path adjusting device 250 is a filter placed at 45 degrees with the first laser L1 incident direction, and the light transmittance curve of the filter is as shown in FIG. 3, and the filter can transmit the first at 462 nm. The second laser L2 of the polarization state, and the first laser L1 and the 462 nm polarization state of 445 nm are perpendicular to the second laser L2 of the first polarization state. Here, the first polarization state is a p-polarization state, and the polarization state perpendicular to the first polarization state is an s-polarization state. To ensure that the second laser L2 is completely transmissive to the filter, the second laser L2 is set to emit in a p-polarized state. The second laser L2 transmitted from the second laser light source 220 transmits the filter to the scattering device 240, is scattered, and is again emitted to the filter. Since the scattered second laser L2 is in a non-polarized state, the s-polarized light of the second laser L2 in the non-polarized state will be reflected and deflected by 90 degrees. Considering that the polarization state of the second laser L2 scattering is not completely disturbed, wherein the p-polarized light may occupy more than half of the ratio, so in order to increase the ratio of the s-polarized light, it may be in the filter and the wavelength conversion device 230. A quarter wave plate 280 is disposed between the optical paths for converting more than half of the p-polarized light into s-polarized light. At this time, the s-polarized light incident from the second lens 270 into the second laser L2 of the filter will be greater than 50% and reflected. In addition, the quarter wave plate 280 can also be disposed between the scattering material of the scattering device 240 and the reflective substrate, and can also function to convert the polarization state of the incident light. The first laser L1 incident on the filter will be reflected and deflected by 90 degrees to the wavelength conversion device 230, and the wavelength converting material is excited to produce a yellow received laser light L3. The yellow laser beam L3 is incident on the filter and transmitted and emitted in the same optical path as the second laser L2 in the s-polarized state after scattering.

It is worth noting that the falling edge of the actual transmittance curve of the filter tends to have a certain slope, while the spectral distances of the blue light of 445 nm and 462 nm are very close, so it is likely that the filter is for the first laser L1 and the second laser. The reflectance or transmittance of L2 is not 100%, but in fact this case Nor does it have a large impact on the utilization of the first laser L1 and the second laser L2. For example, when the filter is not ideal, 445 nm blue light will partially transmit into the scattering device 240. Assuming that the first laser L1 is reflected into the wavelength conversion device 230 via the filter, and the reflectance is only 80%, the remaining 20% is transmitted and incident on the scattering device 240, scattered and reflected by the scattering device 240, and then incident on the filter 250 again. If the loss of the p-polarized light transmission filter is not considered, 80% of the remaining 20%, that is, 16% of the total energy, will be reflected and injected into the subsequent optical system, and only 4% of the light is filtered. The sheet is transmitted to cause an excessive loss. Therefore, in practice, most of the first laser L1 is reflected to the wavelength conversion device 230 without causing a large loss, and most of the above refers to more than 60%. The case of the second laser L2 is similar to that of the first laser L1, and most of it needs to be transmitted to the scattering device 240, and it can be used to improve the blue light component in the emitted light, and since the proportion of scattering is reduced, the lost p The ratio of the light of the polarization state to the second laser light L2 emitted by the second laser light source 220 is instead reduced.

Since the amount of optical spread of the Lambertian distribution is large, the cross-sectional area of the beam of the outgoing light of the wavelength conversion device 230 and the scattering device 240 becomes large, so that it is necessary to provide the first lens 260 and the second lens 270. The first lens 260 can receive the first laser L1 emitted from the optical path adjusting device 250 and focus the first laser L1 to the wavelength conversion device 230, and collimate the laser light L3 emitted from the wavelength conversion device 230 to be emitted to the optical path adjusting device 230. The second lens 270 can receive the second laser emitted by the optical path adjusting device 250 L2 focuses the second laser L2 to the scattering device 240, and collimates the scattered light emitted by the scattering device 240 to be emitted to the optical path adjusting device 250. On the other hand, in order to ensure that the size of the spot incident on the surface of the wavelength conversion device 230 and the scattering device 240 is uniform, the first lens 260 and the second lens 270 are identical, and the first lens 260 to the wavelength conversion device 230 and the second lens The optical path of 270 to the scattering device 240 is equal. At this time, since the laser beams emitted by the first laser light source 210 and the second laser light source 220 are all collimated light, the first laser beam L1 is formed on the surface of the wavelength conversion device 230 via the first lens 260 and the second laser beam L2 is formed. The second lens 270 has the same spot size formed on the surface of the scattering device 240, and the light distribution of the collimated light emitted by the laser beam L3 or the scattered light emitted from the two spot regions through the first lens 260 or the second lens 270 is also Will be the same. However, whether the collimated light emitted by the first laser light source 210 and the second laser light source 220 or the collimated light adjusted by the first lens 260 and the second lens 270 is impossible, the divergence angle is zero. Parallel light. Here, when the incident light passes through the first lens 260 or the second lens 270, the cross-sectional area of the light beam is reduced, and all of the light beam can be incident on the surface of the light path adjusting device 250, and the light beam can be considered to be collimated, preferably, the light beam is The divergence angle is less than or equal to 10 degrees, and the degree of diffusion of the light beam is small at this time. Therefore, here, the optical paths of the first lens 260 and the second lens 270 are the same as those of the light adjustment device 250 to ensure that the collimated light emitted by the first lens 260 and the second lens 270 has the same spot size on the surface of the light adjustment device 250. . Further, in order to make the spot on the surface of the filter 250 coincide, the wavelength conversion device 230 emits the collimated laser light L3 via the first lens 260 and the second laser L2 that is emitted by the scattering device 240 after being aligned by the second lens 270. After the light sheets are merged into the same optical path, the combined yellow light is superposed on the optical path of the laser light L3 and the second laser light L2. For example, the optical axes of the first lens 260 and the second lens 270 may be disposed to intersect at the same point on the surface of the filter.

Therefore, with the above-described light-emitting device, the light-emitting device realizes a mixed light beam of yellow light and blue light which are completely coincident, and the light intensity distribution of the two is the same, achieving better uniform mixing. On the other hand, the light source module, the wavelength conversion device 230, and the scattering device 240 surround the optical path adjusting device 250, realizing a compact structure of the light emitting device. In addition, the arrangement structure of the first laser light source 210 and the second laser light source 220 in the present creation does not affect the size and position of the spot on the surface of the wavelength conversion device 230 and the scattering device 240, as long as the first laser L1 and the second laser L2 can It may be collected by the first lens 260 or the second lens 270. On the other hand, the first laser source 210 and the second laser source 220 may not be in the same light source module, as long as the two directions are incident on the light adjustment device 250 in the same direction, for example, the first laser L1 and the second laser. It is also possible that L2 is first combined with a polarizing plate and then incident into the optical path adjusting device 250. Furthermore, the wavelength conversion device 230 further includes a driving device 233 for driving the wavelength conversion layer 231 to move, so that the spot formed by the excitation light on the wavelength conversion layer 231 acts on the wavelength conversion along a predetermined path. The layer 231 avoids the problem that the temperature of the wavelength conversion layer 231 rises due to the excitation light being applied to the same position of the wavelength conversion layer 231 for a long time. Specifically, in the embodiment, the driving device 233 is configured to drive the wavelength conversion layer 231 to rotate, so that the spot formed on the wavelength conversion layer 231 of the first laser L2 acts on the wavelength conversion layer 231 along a predetermined circular path. Preferably, the wavelength conversion device 230 has a disk shape, the wavelength conversion layer 231 has a ring shape concentric with the disk, the driving device 233 is a motor having a cylindrical shape, and the driving device 233 is coaxially fixed with the wavelength conversion layer 231. In other embodiments of the invention, the drive device 233 can also drive the wavelength conversion layer 231 to move in other manners, such as level reciprocation or the like. In the case where the wavelength converting material of the wavelength converting layer 231 can withstand higher temperatures, the wavelength converting device 230 may not be provided with a driving device.

Similarly, the scattering device 240 may also include a driving device 242 for driving the scattering layer 241 to move such that a spot formed by the second laser L2 on the scattering device 240 acts on the scattering device 240 along a predetermined path, avoiding The heat is concentrated in the same area. In addition, due to the presence of the driving device 242, the scattering layer 241 rotates, so the position of the spot of the laser incident on the scattering layer 241 changes with time, so the position of the bright spot of the area projected by the light emitting device is constantly changing, and the speed of change When it is fast enough, the human eye cannot perceive the presence of bright spots, so that it has a better effect of eliminating speckle relative to the stationary scattering device.

The positions of the wavelength conversion device 230 and the scattering device 240 can be swapped At this time, the light transmittance curve of the filter is as shown in the fourth figure. The filter can transmit the first laser L1 of 445 nm and the second laser L2 of p-polarized state of 462 nm, and reflect the s-polarization state of 445 nm. The two lasers L2, the emitted light of the second laser light source 220 is incident on the filter in an s-polarization state, and at this time, the filter can also emit a mixed light of the yellow laser light and the second laser light L2 in the p-polarized state. The various embodiments in the present specification are described in a progressive manner, and each embodiment focuses on differences from other embodiments, and the same similar parts between the various embodiments may be referred to each other.

Thus, the above-mentioned system has fully explained the basic structure of the illuminating device of the present invention. In addition, embodiments of the present disclosure also provide a projection system including a light emitting device that can have the structures and functions of the various embodiments described above. The projection system can adopt various projection technologies, such as liquid crystal display (LCD) projection technology and digital light path processor (DLP) projection technology.

Thus, the above-mentioned system has completely and clearly explained the illumination device and projection system of the present invention, and, through the above, we can know that the creation system has the following advantages:

1. In the present creation, the optical path of the first lens 260 via the wavelength conversion device 230 is equal to the optical path of the scattering device 240 to the second lens 270, and the light of the first lens 260 and the second lens 270 to the optical path adjusting device 250. Equal process, And the first lens 260 and the second lens 270 are identical, the first laser beam L1 that is collimated is focused by the first lens 260 on the surface of the wavelength conversion device 230 and the second laser beam L2 that is collimated is focused by the second lens 270. The spot sizes on the surface of the scattering device 240 are equal.

2. According to the first point described above, the reflective scattering device can scatter the incident light into a Lambertian distribution, and the received laser light L3 emitted from the wavelength conversion device 230 is also a Lambertian distribution, and thus the laser light L3 emitted from the wavelength conversion device 230. The second laser beam L2 emitted from the scattering device 240 is collimated by the first lens 260 and the second lens 270, respectively, to form light beams having the same shape, the same light intensity distribution, and the same cross-sectional area. Moreover, after the optical path adjusting device 250, the light beams overlap, so that the two spots overlap, and after the optical paths are combined, the light distribution of the optical path adjusting device 250 is more uniform.

3. According to the second point described above, in the present creation, the splitting of the first laser L1 and the second laser L2 before scattering and the combination of the laser L3 and the scattered second laser L2 are realized by only one optical path adjusting device 250. Light increases the compactness of the light-emitting device.

It is to be understood that the foregoing detailed description of the embodiments of the present invention is not intended to limit the scope of the present invention. Both should be included in the scope of the patent in this case.

1‧‧‧Lighting device and projection system

L1‧‧‧ first laser

L2‧‧‧second laser

L3‧‧‧ by laser

210‧‧‧First laser source

220‧‧‧second laser source

230‧‧‧wavelength conversion device

231‧‧‧wavelength conversion layer

232‧‧‧reflective layer

233‧‧‧ drive

240‧‧‧scattering device

241‧‧‧scattering layer

242‧‧‧ drive

250‧‧‧Light path adjustment device

260‧‧‧first lens

270‧‧‧second lens

280‧‧‧ wave plate

231a‧‧‧ first surface

241a‧‧‧ second surface

Claims (8)

A light-emitting device includes: a first laser light source for emitting a first laser; a second laser light source for emitting a second laser; and an optical path adjusting device for receiving the same direction of incidence The first laser and the second laser, and the first laser and the second laser are emitted along different optical paths; a first lens is configured to receive the first laser emitted from the optical path adjusting device; a second lens for receiving the second laser emitted from the optical path adjusting device; a wavelength converting device having a first surface, wherein the first surface is configured to receive the first shot from the first lens Laser, which in turn converts the first laser into an excited light and emits the received laser light from the first surface to the first lens; and a scattering device having a second surface and the second The surface is configured to receive the second laser emitted by the second lens, wherein the scattering device scatters the second laser and emits the scattered second laser from the second surface to the first lens; , the A lens system to focus the first laser wavelength conversion device, the wavelength conversion device and the light emitted by the laser light to a collimated light a second adjusting device, wherein the second lens focuses the second laser to the scattering device, and collimates the scattered light emitted by the scattering device to the optical path adjusting device; wherein the wavelength converting device reaches the first lens The optical path is equal to the optical path of the scattering device to the second lens, and the optical path of the first lens and the second lens to the optical path adjusting device is equal; and the laser light emitted from the first lens is collimated The second laser beam emitted from the second lens after being collimated by the second lens is combined by the optical path adjusting device and emitted along the same optical path, and the combined laser light and the second laser light path are overlapped. The illuminating device of claim 1, wherein the first laser source and the second laser source are disposed in the same light source module such that the first laser emits in the same direction as the second laser . The illuminating device of claim 1, wherein the optical path adjusting device is a filter, the polarization direction of the second laser is a first polarization direction, and the polarization direction of the first laser is a second The polarization direction is such that the filter has an optical characteristic that transmits the second laser and reflects the first laser, or has an optical characteristic that reflects the second laser and transmits the first laser. The illuminating device of claim 1, further comprising a quarter-wave plate, wherein the quarter-wave plate is disposed between the optical path adjusting device and the scattering device. The illuminating device of claim 1, further comprising a fly-eye lens or a fly-eye lens pair for receiving the first laser and the second laser, and the first laser and the second laser After the light is homogenized, it is emitted to the optical path adjusting device. The illuminating device and the projection system of claim 5, wherein the second laser system emitted from the fly-eye lens or the fly-eye lens pair is further incident on the scattering device, and the second laser is incident on the scattering device. The light spot of the device is a rectangle of 4:3 or 16:9; and the first laser beam emitted from the fly-eye lens or the pair of fly-eye lenses is further incident on the wavelength conversion device, and the first laser is incident on the The spot of the wavelength conversion device exhibits a 4:3 or 16:9 rectangle. The illuminating device of claim 5, further comprising a diffusing lens, wherein the diffusing lens is located between the fly-eye lens or the pair of fly-eye lenses and the second lens for diverging the second laser. The illuminating device according to the first to seventh aspects of the patent application can be applied to a projection system.