CN111781792A - Projection lighting system and projection equipment - Google Patents

Abstract

The invention discloses a projection lighting system and a projection device, comprising: the device comprises a plurality of light source devices, a light combining device, a vibration speckle eliminating device, a compound eye light homogenizing device, a relay device, a light beam control device, a reflection imaging device, a polarization compensation device and a projection device; the relay device is used for adjusting the irradiation area of the whole light beam; the light beam control device is used for transmitting the light beam to the reflection imaging device; the reflection imaging device reflects the light beam to obtain a reflected light beam with image information; the light beam control device is also used for transmitting the reflected light beam to the projection device to be projected correspondingly. According to the invention, through the polarization characteristic of the laser light source and reasonable control of the spot size of the illumination light beam, the reflection imaging device can utilize all polarized light beams to realize a projection illumination system with high utilization rate of the light source, and high-contrast projection can be realized by combining the screening of the polaroid on the light beams entering the projection device, and the contrast can be improved by more than 150%.

Description

Projection lighting system and projection equipment

Technical Field

The invention relates to the field of projection display, in particular to a projection lighting system and projection equipment.

Background

A LCOS (Liquid Crystal on Silicon, Liquid Crystal on Silicon or Liquid Crystal on Silicon) display device is a novel reflective projection display device, which uses a semiconductor Silicon Crystal technology to control Liquid Crystal so as to "project" a color picture. Compared with transmission lcd (liquid Crystal display) and dlp (digital Light processing) display devices, the LCOS display device has the advantages of high Light utilization efficiency, small size, high aperture ratio, mature manufacturing technology, and the like, and can easily realize high resolution and sufficient color expression. Because the LCOS display device has the advantages, the LCOS display device has great advantages in the large-screen display application field in the future.

The traditional LCOS-based projection illumination system introduces polarized light, and the utilization rate of light energy is not high due to impure polarization, and the contrast of black and white is not good, so that the final imaging effect is not good.

Disclosure of Invention

The invention aims to provide a projection illumination system and projection equipment to solve the problems of low light energy utilization rate and low contrast ratio of the traditional projection illumination system.

In a first aspect, the present invention provides a projection illumination system comprising: the device comprises a plurality of light source devices, a light combining device, a vibration speckle eliminating device, a compound eye light homogenizing device, a relay device, a light beam control device, a reflection imaging device, a polarization compensation device and a projection device; the light combining device is used for combining the light beams emitted by the light source devices to obtain a main light beam; the vibration speckle eliminating device is used for eliminating the coherence of laser and weakening speckles generated by laser interference; the compound eye light homogenizing device is used for reshaping the elliptical light spots emitted by the laser light source into rectangular light spots according with the size proportion of the display chip and has an excellent light homogenizing effect; the relay device is used for adjusting the irradiation area of the whole light beam; the light beam control device is used for transmitting the light beam to the reflection imaging device; the reflection imaging device reflects the light beam to obtain a reflected light beam with image information; the polarization compensation device is used for reducing the influence caused by the change of the polarization state of the light beam of the oblique incidence reflection imaging device; the light beam control device is also used for transmitting the reflected light beam to the projection device for corresponding projection.

Namely, the projection illumination system, comprising:

a plurality of light source devices;

the light combining device is used for combining the light beams emitted by the light source devices to obtain a main light beam;

the vibration speckle elimination device is used for eliminating the coherence of the main beam laser and weakening the speckle generated by the laser interference;

the compound eye light homogenizing device is used for reshaping the elliptical light spots emitted by the plurality of light source devices into rectangular light spots according with the size proportion of a display chip;

a relay device for adjusting an irradiation area of the entire light beam;

the light beam control device is used for receiving the light beam emitted by the relay device and transmitting the light beam to the reflection imaging device;

the reflection imaging device is used for reflecting the light beam to obtain a reflected light beam with image information;

and the projection device is used for projecting the reflected light beam with the image information output by the reflection imaging device after being transmitted by the light beam control device.

The invention can combine a plurality of light beams to obtain a main light beam by arranging a plurality of light source devices and a light combination device in the projection lighting system, the speckle generated by laser interference can be effectively weakened by arranging the vibration speckle-eliminating device, the dodging and shaping of the light beam can be realized by arranging the compound eye dodging device, the irradiation area of the whole light beam can be adjusted by arranging the relay device, the polarized light beam can be transmitted to the reflection imaging device by arranging the light beam control device, the reflection imaging device can utilize all polarized light beams to perform reflection imaging, the polarization compensation device is used for reducing the influence caused by the change of the polarization state of the light beams obliquely incident to the reflection imaging device, and the light beam control device can also transmit the reflected light beams reflected by the reflection imaging device to the projection device for projection, so that the light energy utilization rate and the contrast of the projection illumination system can be improved.

Further, the plurality of light source devices include: the light source device comprises a green light source device for emitting a first light beam, a blue light source device for emitting a second light beam and a red light source device for emitting a third light beam; the first light beam, the second light beam and the third light beam are combined into the main light beam through the light combination device.

The invention sets a plurality of light source devices as laser light sources, the polarization characteristics of the laser light sources are perfectly matched with LCOS, and the light efficiency and the contrast of the whole system are improved; through setting up and close the light device, can close the light beam that three kinds of light source devices of red blue green and shine to the main light beam to transmit the main light beam and carry out plastic dodging to compound eye dodging device, from this, make the main light beam form by red blue green three primary colors mixture, convenient follow-up can allocate the color of main light beam as required.

Furthermore, the first light beam emitted by the green light source device is reflected by the light combining device and then combined into the main light beam, and the second light beam emitted by the blue light source device is transmitted by the light combining device and then combined into the main light beam; and the third light beam emitted by the red light source device is reflected by the light combination device and then is combined into the main light beam.

The invention changes the direction of the light beam emitted by the light source device through transmission or reflection to combine light by setting the characteristics of the light combining device, and folds the light path, thereby increasing the utilization rate of space and reducing the occupied space of the projection lighting system.

Further, the light combining device further comprises a half wave plate, and after the P-polarized light beams emitted by the blue light source device and the green light source device are combined, the P-polarized light is converted into S-polarized light through the half wave plate and is combined with the S-polarized light beam emitted by the red light source device into a main light beam. That is, the light combining device 4 includes a first light combining mirror, a half-wave plate and a second light combining mirror, and after the P-polarized light beams emitted by the blue light source device and the green light source device are combined by the first light combining mirror, the P-polarized light beams are converted into S-polarized light beams by the half-wave plate and are combined with the S-polarized light beams emitted by the red light source device to the main light beam by the second light combining mirror.

The polarization states of the blue light beam and the green light beam are changed by arranging the half wave plate, so that the polarization states of the main light beam are kept consistent after the blue light beam and the green light beam are combined with the red light beam and are S-polarized light.

Further, the vibration speckle elimination device comprises a Gaussian diffusion sheet and a VCM vibration device; the Gaussian diffusion sheet determines a reference plane and diffuses the main light beam; and the VCM vibration device is used for driving the Gaussian diffusion sheet to do periodic motion in a reference plane.

The vibration speckle eliminating device is arranged, the Gaussian diffusion sheet is used for diffusing the main light beam, and the periodic vibration is used for diffusing the light at different moments to different positions, so that interference images (speckles) generated by the laser at different moments are unstable, and the influence of the speckles is weakened; the VCM vibration device is used for driving the Gaussian diffusion sheet to do periodic motion in a reference plane, the vibration frequency of the VCM vibration device is 60Hz, and the amplitude of the VCM vibration device is +/-0.5 mm.

Further, the system further comprises: a compound eye dodging device; and the main light beam obtained by the light combination of the light combination device is transmitted to the relay device after being homogenized and shaped by the compound eye light homogenizing device.

The compound eye dodging device is arranged, and the main light beam can be subjected to dodging and shaping and then transmitted to the relay device, so that the subsequent obtained light spots are more uniform, and the size proportion of a chip to be illuminated is matched after shaping, so that the light energy utilization rate of the whole illumination system is improved.

Further, the system further comprises: a relay device for adjusting an irradiation area of the polarized light beam; the main light beam after the shaping and the dodging of the compound eye dodging device is transmitted to the light beam control device after the irradiation area is adjusted by the relay device.

The invention adjusts the irradiation area of the polarized light beam by arranging the relay device, so that when the polarized light beam is in the incident light beam control device, the light beam control device can receive all the polarized light beams and ensure that the polarized light beam more reasonably matches the size of the chip when reaching the image surface, thereby improving the utilization rate of the projection illumination system to the light energy and reducing the unnecessary waste of the light energy.

Further, the beam control device comprises a polarization beam splitter prism; the polarized light beam after light combination is reflected by the polarization beam splitter prism and then transmitted to the reflection imaging device; and the reflection imaging device reflects the polarized light beam to obtain a reflected light beam, and the reflected light beam is transmitted to the projection device for corresponding projection after being transmitted by the polarization beam splitter prism.

The polarization beam splitter prism is arranged, so that the polarization beam can be transmitted to the reflection imaging device after being reflected by the polarization beam splitter prism, and the reflection light can be transmitted to the projection device for projection after being transmitted by the polarization beam splitter prism, so that the control of the beam can be realized through the simple polarization beam splitter prism, the light path of the beam is changed, and the problem of image quality deterioration caused by small space difference between the projection device and the reflection beam is avoided.

Furthermore, the illumination system also comprises a polarization compensation device and a polarizing plate, wherein the polarization compensation device is mainly a quarter-wave plate, and the fast axis direction of the quarter-wave plate and the polarization direction of the light beam reflected by the reflection imaging device form a certain included angle; the direction of the polaroid is consistent with the polarization direction of the light beam reflected by the reflection imaging device.

The invention can realize high-contrast projection by arranging the polarization compensation device and the polaroid, reducing the influence caused by the change of the polarization state of the light beam obliquely incident on the reflection imaging device through the polarization compensation device and combining the sieving of the polaroid on the light beam entering the projection lens. Namely, the polarization compensation device comprises a quarter-wave plate with an adjustable angle, and the fast axis direction of the quarter-wave plate and the polarization direction of the light beam reflected by the reflection imaging device form a certain included angle.

The polaroid is arranged between the light beam control device and the projection device.

Further, the light source device includes: a light source and a collimating flat top member; the collimation flat-top component is used for collimating and flatly-topping the light emitted by the light source and then transmitting the collimated and flatly-topped light to the light combining device.

The invention collimates the flat top to the light emitted by the light source by arranging the collimation flat top component, thereby improving the uniformity of the main light beam and improving the quality of the subsequent projection.

Further, the collimation flat-top component comprises a first lens and a second lens which are sequentially arranged along the emergent direction of the light source; the first lens and the second lens are used for collimating and flattop the light emitted by the light source.

The first lens and the second lens are arranged, so that the functions of collimation and flat top are realized, and the Gaussian light energy distribution in the space of the light beam emitted by the light source is ensured to be as uniform as possible.

Most preferably, the projection illumination system comprises:

the light combination device comprises a blue-transmitting and green-reflecting light splitting device and a blue-green-transmitting and red-reflecting light splitting device;

the green light source device emits a first light beam, the first light beam is reflected by the blue-green light-transmitting and green-reflecting light-splitting device and is transmitted through the blue-green light-transmitting and red-reflecting light-splitting device to be combined into a main light beam;

the blue light source device emits a second light beam, transmits the second light beam through the blue-transmitting green-reflecting light splitting device and the blue-transmitting green-reflecting red light splitting device, and then combines the light beam into a main light beam;

the red light source device emits a third light beam, and the third light beam is reflected by the blue-green-red light-transmitting light-reflecting light-splitting device and then is combined into a main light beam;

the vibration speckle eliminating device receives the main beam output by the light combining device and outputs the main beam after eliminating the coherence of laser and weakening speckles generated by laser interference;

the compound eye dodging device is used for receiving the main light beam output by the vibration speckle dispersing device and shaping and dodging the main light beam;

the relay device is used for receiving the main light beam output by the compound eye dodging device and adjusting the irradiation area of the main light beam;

the light beam control device is used for receiving the light beam adjusted by the relay device and transmitting the polarized light beam to the reflection imaging device;

the reflection imaging device receives the light beam output by the light beam control device and reflects the light beam to obtain a reflected light beam with image information;

the polarization compensation device is used for reducing the polarization state change of the light beam which is inclined into the incidence and reflection imaging device;

and the reflected light beam with the image information is transmitted to the projection device through the light beam control device to be correspondingly projected, so that the contrast is further improved.

A half wave plate can be arranged between the blue-transmitting green-reflecting light splitting device and the blue-green-transmitting red-reflecting light splitting device, and P polarized light beams emitted by the blue light source device and the green light source device are converted into S polarized light beams through the half wave plate after being combined by the blue-transmitting green-reflecting light splitting device and the red light source device, and the S polarized light beams emitted by the blue light source device and the green light source device are combined to form a main light beam.

In a second aspect, the invention provides a projection device comprising the projection illumination system described above.

According to the invention, through the periodic vibration of the Gaussian diffusion sheet, light at different moments is diffused to different positions by the Gaussian diffusion sheet, so that interference images (speckles) generated by laser at different moments are unstable, and the problem of the speckles caused by the coherence of the laser is effectively reduced; by utilizing the high polarization of the laser light source and controlling the irradiation light spot reaching the image plane through the compound eye dodging system and the relay system, the reflection imaging device can utilize almost all polarized light beams to perform reflection imaging, so that the light energy utilization rate of the projection illumination system can be improved; the quarter-wave plate and the polaroid are arranged in the projection system, so that the contrast of a projection picture is greatly improved, and the contrast can be improved by more than 150%.

The invention can realize a projection illumination system with higher utilization rate of the light source by using all polarized light beams by the reflection imaging device through the polarization characteristic of the laser light source and reasonably controlling the spot size of the illumination light beams, reduce the influence caused by the change of the polarization state of the light beams obliquely incident to the reflection imaging device by the polarization compensation device, realize high-contrast projection by combining the screening of the polaroid on the light beams entering the projection device, improve the contrast of the whole system from the original 120:1 to 200:1, and improve the contrast by more than 150%.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a projection illumination system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an optical path of a projection illumination system according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a vibration speckle reduction device according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a compound eye dodging device according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a projection polarization compensation apparatus according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a light source device according to an embodiment of the present invention.

Fig. 7 is a schematic light ray diagram of an illumination system after non-sequential pattern modeling optimization in ZEMAX software according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of a shaped light spot at an LCOS image plane after optimization in ZEMAX according to an embodiment of the present invention.

Fig. 9 is a cross-cut and a longitudinal-cut of a shaped light spot at an LCOS image plane after optimization in ZEMAX according to an embodiment of the present invention.

Icon: 1-green light source means; 2-a blue light source device; 3-a red light source device; 4-a light combining device; 5-a vibration speckle-dissipating device; 6-compound eye dodging device; 7-a relay device; 8-a diffusion sheet; 9-a reflective imaging device; 10-polarization compensation means; 11-a beam control device; 12-a polarizer; 13-a projection objective; 101-a light source; 102-a first lens; 103-a second lens; 111-quarter wave plate; 112-wave plate angle adjusting mechanism.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when products of the application are used, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Fig. 1 is a schematic structural diagram of a projection illumination system according to an embodiment of the present invention, where the embodiment of the present invention provides a projection illumination system, including: the device comprises a green light source device 1, a blue light source device 2, a red light source device 3, a light combination device 4, a vibration speckle elimination device 5, a compound eye dodging device 6, a relay device 7, a diffusion sheet 8, a reflection imaging device 9, a polarization compensation device 10, a light beam control device 11, a polarizing sheet 12 and a projection objective 13; the light combining device 4 is used for combining light beams emitted by a plurality of light source devices (the green light source device 1, the blue light source device 2 and the red light source device 3) to obtain a main light beam; the vibration speckle eliminating device 5 is used for eliminating the coherence of main beam laser and weakening speckles generated by laser interference; the compound eye light homogenizing device 6 is used for shaping the elliptical light spots emitted by the laser light source into rectangular light spots according with the size proportion of the display chip and has an excellent light homogenizing effect; the relay device 7 is used for adjusting the irradiation area of the whole light beam; the diffusion sheet 8 further homogenizes the illumination light beam; the light beam control device 11 is used for transmitting the light beam to the reflection imaging device 9; the reflection imaging device 9 reflects the light beam to obtain a reflected light beam with image information; the light beam control device 11 is also used for transmitting the reflected light beam to the projection lens for corresponding projection; the polarization compensation device 10 is used to reduce the influence caused by the polarization state change of the light beam of the oblique incidence reflection imaging device 9, and the high-contrast projection can be realized by combining the screening of the polarizing film 12 on the light beam entering the projection lens.

Firstly, considering that in the conventional LCOS projection illumination system, the light beam incident on the light beam control device 11 is usually unpolarized light, but the light beam control device 11 is only configured to control the S-polarized light beam to enter the reflective imaging device 9, so that half of the light energy in the unpolarized light is wasted, and the light energy utilization rate of the projection illumination system is low; in addition, due to the influence caused by the polarization state change of the light beam obliquely incident on the reflective imaging device 9, the imaging contrast is not high and the imaging effect is not good.

In an alternative embodiment of the invention, provision is made in the projection illumination system for: the projection illumination system comprises a plurality of light source devices, a light combination device 4, a vibration speckle eliminating device 5, a compound eye light homogenizing device 6, a relay device 7, a diffusion sheet 8, a reflection imaging device 9, a polarization compensation device 10, a light beam control device 11, a polarizing sheet 12 and a projection device 13, wherein the reflection imaging device 9 can utilize all polarized light beams by reasonably controlling the spot size of the illumination light beams through the polarization characteristic of a laser light source, so that the projection illumination system with high utilization rate of the light source is realized, the influence caused by the change of the polarization state of the light beams obliquely incident on the reflection imaging device 9 is reduced through the polarization compensation device 10, and high-contrast projection can be realized by combining the screening of the polarizing sheet 12 on the light beams entering a projection lens.

Fig. 2 is a schematic optical path diagram of a projection illumination system according to an embodiment of the present invention, as shown in fig. 2, a plurality of light source devices (a green light source device 1, a blue light source device 2, and a red light source device 3) respectively emit light beams, the light beams emitted by the laser light source devices are usually polarized light, wherein the light beams emitted by the blue and green light sources are P-polarized light, and the light beam emitted by the red light source is S-polarized light.

Next, the light beams emitted by the plurality of light source devices are combined to a main light beam by the light combining device 4, and the main light beam is transmitted to the vibration speckle removing device 5 by the light combining device 4. The light combining device 4 combines the light beams emitted by the plurality of light sources into one direction by changing the transmission direction of the light beams, namely, combines the light beams into a main light beam, thereby realizing the purpose of light combination. Meanwhile, because the light combining device 4 only changes the propagation direction of the light beams, the properties of the light beams are not changed, in order to ensure that the polarization states of the light beams emitted by the light source devices are kept consistent, a half wave plate is added before the combined light of the blue light beam and the green light beam enters the main light beam, and finally the main light beam emitted by the light combining device 4 is S polarized light.

Moreover, after the main light beam enters the vibration speckle elimination device 5, the Gaussian diffusion sheet diffuses the main light beam, and light at different moments is diffused to different positions by the Gaussian diffusion sheet through periodic vibration, so that interference images (speckles) generated by laser at different moments are unstable, and the influence of the speckles is weakened.

Then, the main beam is shaped and homogenized by the compound eye homogenizing system 6, the irradiation area of the whole beam is controlled by the relay device 7, and after further homogenized by the diffusion sheet 8, the input polarized beam can be transmitted to the reflective imaging device 9 by the beam control device 11.

Finally, the reflected light beam reflected by the reflective imaging device 9 is used for bearing image information, the light beam control device 11 also transmits the reflected light beam to the projection objective 13, wherein the polarization compensation device 10 can reduce the influence caused by the change of the polarization state of the light beam obliquely incident to the reflective imaging device 9, and in combination with the screening of the polarizing plate 12 on the light beam entering the projection lens, the reflected light beam finally passes through the projection objective 13 to form a high-contrast projection image on the image plane, so that the projection image displays the image information.

The projection objective 13 is used mainly for projecting the reflected light beam with image information. The projection objective 13 may be a projection lens. The specific type of the projection objective 13 is not limited, and can be adjusted according to the actual projection requirements.

Therefore, with the projection illumination system provided by the embodiment of the present invention, the reflection imaging device 9 can utilize all polarized light beams by the polarization characteristics of the laser light source and reasonably control the spot size of the illumination light beam, so as to implement a projection illumination system with a high utilization rate of the light source, and the polarization compensation device 10 reduces the influence caused by the change of the polarization state of the light beam obliquely incident to the reflection imaging device 9, and in combination with the screening of the polarizing film 12 on the light beam entering the projection device, high-contrast projection can be implemented.

On the basis of the above embodiment, the plurality of light source devices include: a green light source device 1 for emitting a first light beam, a blue light source device 2 for emitting a second light beam and a red light source device 3 for emitting a third light beam; the first, second and third light beams are combined into the main light beam by the light combining device 4.

In an optional implementation process of the present invention, in order to ensure the quality of subsequent projected images, the light source device may adopt a three-primary-color light mode to respectively emit green laser, blue laser, and red laser, that is: a green light source device 1, a blue light source device 2, and a red light source device 3 are provided. By adjusting the proportion of the first light beam, the second light beam and the third light beam emitted by the green light source device 1, the blue light source device 2 and the red light source device 3, the main light beams with different light colors can be obtained, so that the light color of the main light beam meets the requirement of subsequent projection illumination.

It should be noted that the RGB color model, also called RGB color model or RGB color model, is an additive color model that adds the three primary colors of Red (Red), Green (Green) and Blue (Blue) in different proportions to generate various colors. The primary purpose of the RGB color model is to detect, represent and display images in an electronic system. By adopting the three primary color light model, a relatively pure white light illumination system can be obtained, so that the projection illumination system provided by the embodiment of the invention has a wider color gamut, and the color rendering capability is stronger than that of the traditional projection illumination system.

In an optional embodiment of the present invention, a first light beam emitted by the green light source device 1 is reflected by the light combining device 4 and then combined into a main light beam, and a second light beam emitted by the blue light source device 2 is transmitted by the light combining device 2 and then combined into the main light beam; the third light beam emitted by the red light source device 3 is reflected by the light combination device 4 and then combined into the main light beam.

It should be noted that if the installation positions of different light source devices are changed, the light combining device 4 with different performance can be installed according to the positions of different light sources, so as to purposefully change the light path of the light beam to combine light. In order to combine the light beams with different colors into the main light beam, light combining mirrors with different performances can be arranged in the light combining device 4, and the light paths of the light beams with different colors are changed by the transmission or reflection of the light combining mirrors on the light beams with different colors, so that the light paths of the light beams with different colors are overlapped with the light path of the main light beam, and the light combination is realized. The light combining device 4 may include a first light combining mirror (blue-green light-reflecting light-splitting device), a half-wave plate and a second light combining mirror (blue-green light-reflecting light-splitting device), the performance of the first light combining mirror and the performance of the second light combining mirror may be changed by adjusting the type of the coating film on the first light combining mirror and the second light combining mirror, the half-wave plate is used to ensure that the polarization state of the combined light beam is consistent, and if the polarization state of the initial laser light source is consistent, the wave plate is not used.

Therefore, by arranging the light combining device 4 in the embodiment of the invention, the times of light path turning of the light beams can be reduced, so that the three-light combination is easier, the difficulty in correcting the optical axis is reduced, and the problem of uneven image surface color caused by inaccurate optical axis is avoided.

On the basis of the above embodiment, as shown in fig. 3, the vibration speckle-eliminating device 5 includes a gaussian diffusion sheet and a VCM (Voice Coil Motor) vibration device; the Gaussian diffusion sheet determines a reference plane and diffuses the main light beam; the VCM vibration device is used for driving the Gaussian diffusion sheet to do periodic motion in the reference plane, and light at different moments is diffused to different positions by the Gaussian diffusion sheet through periodic vibration, so that interference images (speckles) generated by laser at different moments are unstable, and the influence of the speckles is weakened.

On the basis of the above embodiment, the system further includes: a compound eye dodging device 6; the main beam obtained by combining the light by the light combining device 4 passes through the vibration speckle elimination device 5, is homogenized by the compound eye light homogenizing device 6, and is transmitted to the relay device 7.

In an optional implementation process of the present invention, in order to ensure uniformity of subsequent imaging, the compound eye dodging device 6 may be disposed between the vibration speckle reduction device 5 and the relay device 7, and the main light beam may be shaped and dodged by the compound eye dodging device 6 and then transmitted to the relay device 7, so that the main light beam may be more uniform, and uniformity of brightness of a projected image during subsequent projection may be ensured.

Fig. 4 is a schematic light path diagram of the compound eye dodging device, the compound eye dodging device 6 may be formed by a series of small lens combinations, and a double-row compound eye lens array is applied to the illumination system to obtain high light energy utilization rate and large-area uniform illumination. The fly-eye dodging device 6 can realize uniform illumination by arranging the first fly-eye lens array and the second fly-eye lens array in parallel, wherein the focal point of each small unit lens in the first fly-eye lens array is superposed with the center of the corresponding small unit lens in the second fly-eye lens array, and the optical axes of the two lines of fly-eye lenses are parallel to each other. Therefore, the main light beam is transmitted through each small unit lens of the first fly-eye lens array and then focused on the center of the small unit lens corresponding to the second fly-eye lens array, and a plurality of light source images are formed for illumination. After being transmitted by the first fly-eye lens array, the main light beam is also transmitted by the second fly-eye lens array to form a plurality of corresponding light spots, and the light spots are transmitted to the relay device to further adjust the light beam irradiation area.

It is worth to be noted that the fly-eye dodging device 6 disperses the light of the main beam irradiated on the fly-eye lens array to the whole image surface to be illuminated, so as to play a role of uniform illumination; in the fly-eye lens array, the length and the width of each small fly-eye are designed according to the aspect ratio of an image surface to be illuminated, so that the main light beam is shaped, and subsequent projected images can have uniform brightness and the aspect ratio meets the requirement; the fly-eye lens is made of PMMA, is arranged in a 7 multiplied by 4 array, has the thickness of 2.406mm, has the size of a single fly-eye sub-eye of 0.756mm multiplied by 0.42mm and has the curvature radius of 0.8 mm.

On the basis of the above embodiment, the system further includes: a relay device 7 for adjusting an irradiation area of the polarized light beam; the polarized light beam after the dodging shaping by the compound eye dodging device 6 is transmitted to the light beam control device 11 after the irradiation area is adjusted by the relay device 7.

In an alternative embodiment of the invention, the irradiation area of the polarized light beam can be maximized in order to transmit the polarized light beam to the light beam control device 11, whereby the irradiation area of the polarized light beam can be adjusted by providing the relay device 7. The relay device comprises a relay lens 701 and a middle lens 702, and the polarized light beam is transmitted to the light beam control device 11 through the relay system 7, so that the relay device 7 can play the roles of amplifying and dodging the polarized light beam as a whole. The relay lens parameters are shown in table 1:

TABLE 1

	Radius of curvature R1	Radius of curvature R2
			Relay lens 701	﹢∞	-23.461
Relay lens 702	﹢∞	-21.539

On the basis of the above embodiment, the light beam control device 11 includes a polarization splitting prism; the diffusion sheet 8 further diffuses the polarized light beam after the light uniformization, and transmits the polarized light beam to the reflection imaging device 9 after being reflected by the polarization beam splitter prism; the reflected light beam obtained by reflecting the polarized light beam by the reflection imaging device 9 is transmitted to the projection objective 13 for corresponding projection after being transmitted by the polarization beam splitter prism.

In the optional implementation process of the invention, by arranging the polarization beam splitter prism, different processing modes can be adopted for the P polarization beam and the S polarization beam through the property of a polarization beam splitting dielectric film in the polarization beam splitter prism, wherein the S polarization beam is reflected and transmitted to the reflection imaging device 9, the P polarization beam reflected by the reflection imaging device 9 is transmitted and enters the projection device 13 for projection, meanwhile, the irradiation area of a projection illumination system can be reduced, and the turning times of a light path are reduced, so that the projection quality is improved.

Fig. 5 is a schematic diagram of a polarization compensation device according to an embodiment of the present invention, and as shown in fig. 5, the polarization compensation device 9 includes: a quarter wave plate 111 and a wave plate angle adjusting mechanism 112; the wave plate angle adjustment mechanism 112 can adjust the angle of the quarter wave plate 111 around the axis.

In the optional implementation process of the present invention, the fast axis direction of the quarter-wave plate 111 forms a certain included angle with the polarization direction of the light beam reflected by the reflective imaging device 9, the angle of the quarter-wave plate 111 is adjusted by the wave plate angle adjusting mechanism 112, so that the influence caused by the polarization state change of the light beam obliquely incident on the reflective imaging device 9 can be reduced, and the polarized light beam entering the projection lens is screened by combining the polarizing plate 12, so that the contrast ratio is obviously improved.

Fig. 6 is a schematic structural diagram of a light source device according to an embodiment of the present invention, and as shown in fig. 6, the light source device includes: a light source 101 and a collimating flat top member; the collimating flat-top component is used for collimating and flat-top the light emitted by the light source 101 and then transmitting the light to the light combining device 4.

In the optional implementation process of the present invention, the light emitted by the light source 101 is divergent, and the light emitted by the light source 101 may be collimated and flat-topped by the collimating and flat-topped member and then transmitted to the light combining device 4, so that the light energy utilization rate of the light emitted by the light source 101 may be increased, and the uniformity of the main light beam may be improved, so as to improve the subsequent projection quality.

It is worth to say that the collimating flat top component includes a first lens 102 and a second lens 103 which are sequentially arranged along the emergent direction of the light source 101; the first lens 102 and the second lens 103 serve to collimate and flat-top the light emitted from the light source 101.

It should be further noted that the collimating and flat-top component is mainly used for collimating and flat-top processing the light emitted by the light source 101, and the collimating and flat-top component may include a first lens 102 and a second lens 103, where the first lens 102 may be a glass spherical lens, and the second lens 103 may be a plastic aspheric lens. Considering the high energy ratio of the laser light source, the first lens 102 and the second lens 103 are both glass lenses, and the parameters of the first lens 102 and the second lens 103 are shown in table 2:

TABLE 2

	Radius of curvature R1	Radius of curvature R2
			First lens 102	-20	-4.314
Second lens 103	-51.922	-9.239

Therefore, the collimation flat-top component provided by the embodiment of the invention not only has the function of collimation, but also has the uniformity in balance, namely, the light emitted by the light source 101 is subjected to flat-top treatment, so that the spatial Gaussian light energy distribution of the light beam is changed into uniform distribution as much as possible, and the quality of subsequent projection is improved.

FIG. 7 is a schematic diagram of the light rays of the illumination system after non-sequential mode modeling optimization in ZEMAX software, the whole illumination system is compact in structure, the collimation of the light rays is good, and the requirements of optical design are met.

Fig. 8 and 9 are a shaping spot diagram, a spot transverse diagram and a spot longitudinal diagram at the LCOS image surface after optimization in the ZEMAX, curves in the transverse diagram and the longitudinal diagram represent energy densities at corresponding positions, and results show that the spot shape is a strict rectangle, the length-width ratio is close to that of the reflection imaging device 9, the irradiation area is slightly larger than the effective area of the reflection imaging device 9, the light energy utilization rate of the illumination light source is ensured to the maximum extent, and the illumination brightness is improved while the high uniformity is ensured.

In summary, an embodiment of the present invention provides a projection illumination system and a projection apparatus, where the system includes: the device comprises a green light source device 1, a blue light source device 2, a red light source device 3, a light combination device 4, a vibration speckle elimination device 5, a compound eye dodging device 6, a relay device 7, a diffusion sheet 8, a reflection imaging device 9, a polarization compensation device 10, a light beam control device 11, a polarizing sheet 12 and a projection objective 13; the light combining device 4 is used for combining the light beams emitted by the plurality of light source devices to obtain a main light beam; the vibration speckle eliminating device 5 is used for eliminating the coherence of laser and weakening speckles generated by laser interference; the compound eye light homogenizing device 6 is used for shaping the elliptical light spots emitted by the laser light source into rectangular light spots according with the size proportion of the display chip and has an excellent light homogenizing effect; the relay device 7 is used for adjusting the irradiation area of the whole light beam; the diffusion sheet 8 further homogenizes the illumination light beam; the light beam control device 11 is used for transmitting the light beam to the reflection imaging device 9; the reflection imaging device 9 reflects the light beam to obtain a reflected light beam with image information; the light beam control device 11 is also used for transmitting the reflected light beam to the projection lens for corresponding projection; the polarization compensation device 10 is used for reducing the influence caused by the polarization state change of the light beam of the oblique incidence reflection imaging device 9, and high-contrast projection can be realized by combining the screening of the polaroid 12 on the light beam entering the projection lens, and the contrast can be improved by more than 150%.

The above description is only an example of the present invention, and is not intended to limit the scope of the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A projection illumination system, comprising:

a plurality of light source devices;

the light combining device is used for combining the light beams emitted by the light source devices to obtain a main light beam;

the vibration speckle elimination device is used for eliminating the coherence of the main beam laser and weakening the speckle generated by the laser interference;

the compound eye light homogenizing device is used for reshaping the elliptical light spots emitted by the plurality of light source devices into rectangular light spots according with the size proportion of a display chip;

a relay device for adjusting an irradiation area of the entire light beam;

the light beam control device is used for receiving the light beam emitted by the relay device and transmitting the light beam to the reflection imaging device;

the reflection imaging device is used for reflecting the light beam to obtain a reflected light beam with image information;

and the projection device is used for projecting the reflected light beam with the image information output by the reflection imaging device after being transmitted by the light beam control device.

2. The projection illumination system of claim 1 wherein the plurality of light source devices comprises: the light source device comprises a green light source device for emitting a first light beam, a blue light source device for emitting a second light beam and a red light source device for emitting a third light beam;

the first light beam, the second light beam and the third light beam are combined into the main light beam through the light combination device.

3. The projection illumination system of claim 2, wherein the light combining device 4 includes a first light combining mirror, a half-wave plate and a second light combining mirror sequentially disposed, and after the P-polarized light beams emitted by the blue light source device and the green light source device are combined by the first light combining mirror, the P-polarized light beams are converted into S-polarized light beams by the half-wave plate and are combined with the S-polarized light beams emitted by the red light source device into a main light beam by the second light combining mirror.

4. The projection illumination system of claim 1 wherein the vibration despeckle device comprises a gaussian diffuser and a VCM vibrating device.

5. The projection illumination system of claim 1 wherein the beam steering device comprises a polarizing beam splitting prism;

the polarized light beam after the diffusion sheet diffuses the uniform light is transmitted to the reflection imaging device after being reflected by the polarization beam splitter prism;

and the reflection imaging device reflects the polarized light beam to obtain a reflected light beam, and the reflected light beam is transmitted to the projection device for corresponding projection after being transmitted by the polarization beam splitter prism.

6. The projection illumination system of claim 1 further comprising a polarization compensation device and a polarizer, wherein the polarization compensation device comprises an angularly adjustable quarter-wave plate, and the fast axis direction of the quarter-wave plate forms an angle with the polarization direction of the light beam reflected from the reflective imaging device.

7. The projection illumination system of claim 1 further comprising a polarizer disposed between the beam steering arrangement and the projection arrangement.

8. The projection illumination system of claim 1 wherein the light source device comprises: a light source and a collimating flat top member; the collimation flat-top component is used for collimating and flatly-topping the light emitted by the light source and then transmitting the collimated and flatly-topped light to the light combining device.

9. A projection illumination system, comprising:

the light combination device comprises a blue-transmitting and green-reflecting light splitting device and a blue-green-transmitting and red-reflecting light splitting device;

the green light source device emits a first light beam, the first light beam is reflected by the blue-green light-transmitting and green-reflecting light-splitting device and is transmitted through the blue-green light-transmitting and red-reflecting light-splitting device to be combined into a main light beam;

the blue light source device emits a second light beam, transmits the second light beam through the blue-transmitting green-reflecting light splitting device and the blue-transmitting green-reflecting red light splitting device, and then combines the light beam into a main light beam;

the red light source device emits a third light beam, and the third light beam is reflected by the blue-green-red light-transmitting light-reflecting light-splitting device and then is combined into a main light beam;

the vibration speckle eliminating device receives the main beam output by the light combining device and outputs the main beam after eliminating the coherence of laser and weakening speckles generated by laser interference;

the compound eye dodging device is used for receiving the main light beam output by the vibration speckle dispersing device and shaping and dodging the main light beam;

the relay device is used for receiving the main light beam output by the compound eye dodging device and adjusting the irradiation area of the main light beam;

the light beam control device is used for receiving the light beam adjusted by the relay device and transmitting the polarized light beam to the reflection imaging device;

the reflection imaging device receives the light beam output by the light beam control device and reflects the light beam to obtain a reflected light beam with image information;

the polarization compensation device is used for reducing the polarization state change of the light beam which is inclined into the incidence and reflection imaging device;

and the reflected light beam with the image information is transmitted to the projection device through the light beam control device to be correspondingly projected.

10. A projection device comprising a projection illumination system as claimed in any one of the preceding claims 1 to 9.

Images