CN219392458U - Light source device and projection system - Google Patents

Abstract

The utility model discloses a light source device and a projection system, comprising a light emitting unit, a lens unit and a polarization conversion element, wherein light emitted by the light emitting unit is collimated by the lens unit and then emitted to the polarization conversion element to be converted into linear polarized light with a single polarization state by the polarization conversion element. The utility model efficiently converts the light emitted by the light-emitting unit into linearly polarized light with a single polarization state, replaces the traditional mode of absorbing the light which does not meet the requirements of the polarization direction by using the polaroid, greatly reduces the light loss, improves the light conversion efficiency and effectively improves the brightness of pictures.

Description

Light source device and projection system

Technical Field

The present disclosure relates to projection technology, and more particularly, to a light source device and a projection system.

Background

Projection display is a display mode of projecting an image generated by a display device onto a screen through an optical system to generate an image, and has the advantages of large screen, high output brightness, high image resolution and the like, and has gradually become the mainstream of modern display technology.

One type of projection technology in the field of projection technology is projection technology combined with liquid crystal display technology, including transmissive LCD and reflective Lcos projection display technology, and its normal operation needs to use polarized light, specifically, the light directly emitted by the light source is unpolarized natural light, and the transmissive LCD and the reflective Lcos cannot be directly irradiated to perform projection, so that the natural light needs to be converted into polarized light to be normally operated. In the prior art, a polarizer is generally used to process natural light emitted by a light source to obtain polarized light, light rays parallel to the absorption axis direction of the polarizer in the natural light can be absorbed, and light rays perpendicular to the absorption axis can penetrate, so that light loss of the light emitted by the light source after passing through the polarizer is 50%, and display brightness can be seriously affected.

Disclosure of Invention

The utility model aims to solve the technical problems and the technical task of improving the prior art, provides a light source device and solves the problems that the traditional light source device in the prior art utilizes a polaroid to obtain polarized light, has serious light loss and affects display brightness.

In order to solve the technical problems, the technical scheme of the utility model is as follows:

a light source device comprises a light emitting unit, a lens unit and a polarization conversion element, wherein light emitted by the light emitting unit is collimated by the lens unit and then emitted to the polarization conversion element to be converted into linear polarized light with a single polarization state by the polarization conversion element. The light source device of the utility model firstly utilizes the lens unit to collimate the light emitted by the light emitting unit, so that more light energy effectively enters the polarization conversion element, the utilization rate and conversion efficiency of the light are improved, the traditional mode of absorbing the light which does not meet the requirements of the polarization direction by utilizing the polaroid is replaced, the light loss is greatly reduced, the light conversion efficiency is improved, most of the natural light emitted by the light emitting unit is converted into usable linear polarized light, the overall light efficiency is improved, and the display brightness is improved.

The polarization conversion element comprises a polarization splitting interface, a reflection interface and a half-wave plate, wherein the polarization splitting interface is inclined to the incident light from the lens unit, the polarization splitting interface transmits the linearly polarized light in a first polarization state and reflects the linearly polarized light in a second polarization state, the linearly polarized light in the second polarization state is guided to exit in the same direction as the linearly polarized light in the first polarization state by reflection of the reflection interface, and the half-wave plate is arranged on the outgoing light path of one of the linearly polarized light in the first polarization state and the linearly polarized light in the second polarization state so that the outgoing light of the polarization conversion element is the linearly polarized light in a single polarization state. The utility model utilizes the polarization conversion element to separate the linear polarized light with different polarization states in the light emitted by the light-emitting unit, and then converts the linear polarized light with different polarization states into the same polarization state, so that the natural light emitted by the light-emitting unit is integrally converted into the linear polarized light with the same polarization state.

Further, the light-emitting units are arranged in an array, and the lens units are in one-to-one correspondence with the light-emitting units. The light source device can flexibly set according to the system brightness requirement or the light source device light emitting area size requirement, the light emitted by each light emitting unit is collimated by one lens unit, the collimation effect is good, the accuracy is high, the size of each lens unit can be set according to the distance between the light emitting units, the heat dissipation is facilitated when the distance between the light emitting units is large, the light spot size formed by the light emitted by the light emitting units after being collimated by the lens units is accurately matched with the size of the polarization conversion element, and the consistency of the polarization state of the light emitted from the polarization conversion element is guaranteed.

Further, the light-emitting unit is arranged on the heat dissipation substrate, the heat productivity of the light-emitting unit during operation is large, the heat dissipation substrate is used for dissipating the heat of the light-emitting unit, the long-acting stable operation of the light-emitting unit is ensured to be in a proper temperature range, the service life of the light-emitting unit is prolonged, the long-acting stable light-emitting brightness of the light-emitting unit is ensured, and the stability of the display brightness is further ensured.

Furthermore, the light emitting side of the polarization conversion element is provided with a homogenizing element, the homogenizing element is used for homogenizing the light emitted by the polarization conversion element, the light emitting directivity of the polarization conversion element is prevented from being too concentrated, and uneven distribution of brightness and color caused by uneven distribution of light rays when the light rays are projected onto a screen is avoided.

Furthermore, the homogenizing element is a diffusion sheet, and light emitted by the light emitting unit is collimated under the action of the lens unit, so that the directivity is good, the energy is concentrated, the conversion utilization rate of the light in the polarization conversion element can be improved, the linearly polarized light emitted from the polarization conversion element also has good collimation directivity, the image light generated when the linearly polarized light emitted from the polarization conversion element is directly irradiated on a display element of a liquid crystal panel type also has good collimation directivity, in other words, the energy is too concentrated when the light irradiates on the display element, the energy distribution of the image light generated by the display element is uneven, and further the image brightness and the color distribution of the image light imaged on a screen through a lens are uneven, so that the viewing experience is affected.

Further, the light-emitting side of the diffusion sheet is provided with the light-condensing cover, the light-emitting of the polarization conversion element generates a larger divergence angle under the action of the diffusion sheet, and light rays with large angles are difficult to effectively irradiate on the display element, so that light loss exists, the light rays with large angles are collected and converged by the light-condensing cover, so that the light can be more effectively irradiated on the display element, the light efficiency is improved, and the brightness of a picture in each angle direction is ensured while the visual angle range is enlarged.

Furthermore, the homogenizing element is a fly-eye lens, and the fly-eye lens is used for processing the light emitted by the polarization conversion element, so that the uniformity and the light utilization rate of the light in a large area are improved.

Furthermore, the light-emitting device of the fly-eye lens is also provided with a shaping lens group, the shaping lens group at least comprises a lens, and the shaping lens group is utilized to further shape the light, so that the light energy is uniformly irradiated on the display element, and the uniformity of the display picture is further improved.

Furthermore, the light emitting side of the polarization conversion element is provided with a polarization element, and for the display element of the transmissive LCD or the reflective Lcos, light in a single deflection state can be normally utilized.

A projection system comprises the light source device.

The projection system disclosed by the utility model can be used for efficiently converting the light emitted by the light-emitting unit into the linearly polarized light in a single deflection state, so that the light loss is greatly reduced, the light conversion efficiency is improved, the brightness of a projection picture can be effectively improved under the condition that the power of the light-emitting unit is not increased, and the projection viewing experience is improved.

Further, the light generated by the light source device is directed to the display element to be modulated into image light by the display element, and the image light is projected and imaged by the imaging system.

Further, the light source devices are provided with a plurality of groups, the light emitting units of different light source devices respectively generate light with different colors, the light generated by each light source device respectively irradiates to one display element to be modulated to obtain image light with one color, and the image light with each color is projected to form images through an imaging system after being combined by a light combining device.

Further, the light generated by the light source device is split into illumination light with different colors through the light splitting component, the illumination light with each color is respectively emitted to one display element to be modulated to obtain image light with each color, and the image light with each color is projected to be imaged through the imaging system after being combined through the light combining device.

Compared with the prior art, the utility model has the advantages that:

the light source device and the projection system efficiently convert the light emitted by the light-emitting unit into the linearly polarized light with a single polarization state, replace the traditional mode of absorbing the light which does not meet the requirements of the polarization direction by using the polaroid, greatly reduce the light loss, improve the light conversion efficiency, effectively improve the brightness of a projection picture and improve the projection viewing experience under the condition of not increasing the power of the light-emitting unit.

Drawings

Fig. 1 is a schematic structural view of a first embodiment of a light source device of the present utility model;

FIG. 2 is a schematic view of another structure of a first embodiment of the light source device of the present utility model;

FIG. 3 is a schematic view of a third embodiment of a light source device according to the present utility model;

fig. 4 is a schematic diagram of a fourth structure of a first embodiment of the light source device of the present utility model;

FIG. 5 is a fifth schematic diagram of a light source device according to an embodiment of the present utility model;

fig. 6 is a schematic structural diagram of a second embodiment of the light source device of the present utility model;

fig. 7 is a schematic structural view of a third embodiment of the light source device of the present utility model;

FIG. 8 is a schematic diagram of a projection system according to a fourth embodiment of the present utility model;

FIG. 9 is a schematic diagram of a projection system according to a fourth embodiment of the present utility model;

FIG. 10 is a schematic diagram of a projection system according to a fourth embodiment of the present utility model;

FIG. 11 is a fourth schematic diagram of a projection system according to a fourth embodiment of the present utility model;

fig. 12 is a schematic diagram of a fifth configuration of a projection system according to a fourth embodiment of the present utility model.

In the figure:

the light emitting unit 1, the lens unit 2, the polarization conversion element 3, the polarization beam splitting interface 31, the reflection interface 32, the half wave plate 33, the heat dissipating substrate 4, the diffusion sheet 51, the light collecting cover 52, the polarization element 53, the fly eye lens 54, the shaping lens group 55, the display element 6, the imaging system 7, the light combining device 8, the beam splitting assembly 9, the beam splitting sheet one 91, the beam splitting sheet two 92, the reflecting mirror one 93, the reflecting mirror two 94 and the reflecting mirror three 95.

Detailed Description

The technical solutions of the embodiments of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The light source device and the projection system disclosed by the embodiment of the utility model can efficiently obtain polarized light, reduce light loss, ensure light output brightness, improve picture brightness and improve projection display effect.

Example 1

As shown in fig. 1 to 4, a light source device mainly includes a light emitting unit 1, a lens unit 2 and a polarization conversion element 3, where light emitted by the light emitting unit 1 is collimated by the lens unit 2 and then is directed to the polarization conversion element 3, so that more light energy effectively enters the polarization conversion element 3, and the utilization rate and conversion efficiency of the light are improved, the polarization conversion element 3 includes a polarization splitting interface 31, a reflection interface 32 and a half-wave plate 33, the polarization splitting interface 31 is inclined to the incident light from the lens unit 2, the polarization splitting interface 31 transmits the linearly polarized light of the first polarization state and reflects the linearly polarized light of the second polarization state, the linearly polarized light of the second polarization state is reflected by the reflection interface 32 and is emitted in the same direction as the linearly polarized light of the first polarization state, the half-wave plate 33 is disposed on the light path of one of the first polarization state and the linearly polarized light of the second polarization state, so that the light of the polarization conversion element 3 is the linearly polarized light of the same polarization state, and the linearly polarized light of the second polarization state is converted into the linearly polarized light of the second polarization state, and the linearly polarized light of the second polarization state is the second polarization state, and the linearly polarized light of the second polarization state is converted into the linearly polarized light of the second polarization state, and the linearly polarized light of the second polarization state is disposed on the half-wave polarization element 33. The light source device according to this embodiment utilizes polarization conversion element 3 to divide the natural light that the light emitting unit 1 sent out according to the difference of polarization state, and the linearly polarized light of different polarization states takes place transmission and reflection respectively to realize the separation, then directs the linearly polarized light of different polarization states to the syntropy outgoing again to the linearly polarized light of different polarization states is converted into the same polarization state through half-wave plate, and the light source device according to this embodiment has replaced traditional mode that adopts the polaroid, can wholly convert the natural light that the light emitting unit 1 sent out into single polarization state, very big reduction light loss improves the utilization ratio of light, can be under the circumstances that does not increase the light emitting unit 1 power very big improvement luminance, effectively improves picture luminance and display effect.

Specifically, the polarization conversion element 3 in this embodiment includes a polarization splitting prism unit that is connected by gluing, where the polarization splitting interface 31 and the reflection interface 32 are formed by film interfaces of the polarization splitting prism unit, and the polarization splitting prism unit is an optical element that is formed by plating a multilayer film interface structure on an inclined plane of a right angle prism, and then gluing into a cube structure, and by using the property that when light is incident at the brewster angle, the light transmittance of P polarization is 1 and the light transmittance of S polarization is less than 1, after the light passes through the multilayer film interface structure multiple times at the brewster angle, the P polarization component is completely transmitted, and most of the S polarization component is reflected by at least 90%. The first polarized light in this embodiment specifically refers to one of the S polarized light and the P polarized light, the second polarized light is the other one, as shown in fig. 1, an included angle between the polarized light splitting interface 31 and the incident light from the lens unit 2 is 45 °, the polarized light splitting interface 31 transmits the S polarized light and reflects the P polarized light, the reflective interface 32 is parallel to the polarized light splitting interface 31, the reflective interface 32 reflects the P polarized light to the same direction as the S polarized light to be emitted, a half-wave plate 33 is attached to an light emitting surface of the P polarized light on the polarized light splitting prism unit, and the half-wave plate 33 converts the P polarized light into the S polarized light, so that all the light emitted from the polarization conversion element 3 is the same polarized light, and specifically is the S polarized light; similarly, as shown in fig. 2, the polarization splitting interface 31 transmits the linearly polarized light in the S polarization state and reflects the linearly polarized light in the P polarization state, the reflection interface 32 reflects and guides the linearly polarized light in the P polarization state to exit in the same direction as the linearly polarized light in the S polarization state, the half-wave plate 33 is attached to the light exit surface of the linearly polarized light in the S polarization state on the polarization splitting prism unit, and the half-wave plate 33 converts the linearly polarized light in the S polarization state into the linearly polarized light in the P polarization state, so that all the lights emitted from the polarization conversion element 3 are light in the same polarization state, and are specifically the linearly polarized light in the P polarization state; as shown in fig. 3, the polarization splitting interface 31 transmits the linearly polarized light in the P polarization state and reflects the linearly polarized light in the S polarization state, the reflection interface 32 reflects and guides the linearly polarized light in the S polarization state to exit in the same direction as the linearly polarized light in the P polarization state, the half-wave plate 33 is attached to the light exit surface of the linearly polarized light in the S polarization state on the polarization splitting prism unit, and the half-wave plate 33 converts the linearly polarized light in the S polarization state into the linearly polarized light in the P polarization state, so that all the lights emitted from the polarization conversion element 3 are the same polarization state, and are specifically the linearly polarized light in the P polarization state; as shown in fig. 4, the polarization splitting interface 31 transmits the linearly polarized light of the P polarization state and reflects the linearly polarized light of the S polarization state, the reflection interface 32 reflects and guides the linearly polarized light of the S polarization state to exit in the same direction as the linearly polarized light of the P polarization state, the half-wave plate 33 is attached to the light exit surface of the linearly polarized light of the P polarization state on the polarization splitting prism unit, and the half-wave plate 33 converts the linearly polarized light of the P polarization state into the linearly polarized light of the S polarization state, so that all the lights emitted from the polarization conversion element 3 are the linearly polarized light of the same polarization state, and are specifically the linearly polarized light of the S polarization state.

The light spot size formed by the light emitted by the light emitting unit 1 after being collimated by the lens unit 2 is precisely matched with the size of the polarization conversion element 3, specifically, the light spot size formed by the light collimated by the lens unit 2 is required to be matched with the size of the polarization splitting prism unit, and as illustrated in fig. 1, the light collimated by the lens unit 2 can only propagate and irradiate the area where the polarization splitting interface 31 is located, the light collimated by the lens unit 2 cannot directly irradiate the area where the reflection interface 32 is located, otherwise, the linearly polarized light in the first polarization state in the light collimated by the lens unit 2 can be directly transmitted from the reflection interface 32, so that the light outgoing of the polarization conversion element 3 contains the linearly polarized light in two different polarization states, therefore, the light spot size formed by the light collimated by the lens unit 2 needs to be smaller than the projection width size of the polarization splitting prism unit in the direction perpendicular to the optical axis, namely, the light spot size formed by the light collimated by the lens unit 2 is smaller than the right angle side width of the right angle prism of the polarization splitting prism unit, a shading piece can be added on the light incoming side of the polarization conversion element 3, otherwise, the linearly polarized light in the first polarization state in the light after the light collimated by the lens unit 2 covers the light outgoing of the polarization conversion element 3 is ensured to be in the single polarization state.

As shown in fig. 5, the light emitting units 1 are arranged in an array, the lens units 2 are in one-to-one correspondence with the light emitting units 1, and the arrangement number, the interval and the like of the light emitting units 1 are flexibly set according to the system brightness requirement or the light emitting area size requirement of the light source device, the light emitted by each light emitting unit 1 is respectively collimated by one lens unit 2, the collimation effect is good, the precision is high, the size of the lens units 2 can be set according to the interval of the light emitting units 1, and the heat dissipation is facilitated when the interval of the light emitting units 1 is larger;

further, as shown in fig. 1 to 5, the light emitting units 1 are disposed on the heat dissipation substrate 4, and the heat dissipation substrate 4 is used for dissipating the heat of the light emitting units, so that the light emitting units 1 can work in a proper temperature range for a long time and stably, the service life is prolonged, and the light emitting brightness is guaranteed to be stable for a long time, specifically, each light emitting unit 1 is respectively disposed on an independent heat dissipation substrate 4, or the array arrangement light emitting units 1 are disposed on the same large-size heat dissipation substrate 4, so that the structure is compact, and the layout is easy.

Example two

As shown in fig. 6, in the first embodiment, the diffusion sheet 51 is disposed on the light emitting side of the polarization conversion element 3, and the light-collecting cover 52 is disposed on the light emitting side of the diffusion sheet 51, so that the light emitted from the polarization conversion element 3 is first diffused by the diffusion sheet 51 and then collected and shaped by the light-collecting cover 52, thereby improving the illumination effect and further improving the display screen effect.

Specifically, the light emitted by the light emitting unit 1 is collimated under the action of the lens unit 2, so that the light has better directivity, and the energy is concentrated, which is favorable for improving the conversion utilization rate of the light in the polarization conversion element, the linearly polarized light with a single polarization state emitted from the polarization conversion element 3 can keep better directivity, that is, the divergence angle of the light emitted from the polarization conversion element 3 is extremely small, when the light emitted from the polarization conversion element 3 directly irradiates onto the display element 6 (such as a transmissive LCD), the divergence angle of the generated image light is extremely small, in other words, the energy is excessively concentrated when the light irradiates onto the display element 6, so that the energy distribution of the image light generated by the display element 6 is uneven, and further, the brightness and the color distribution of the image light imaged on the screen through the lens are uneven, so that the viewing experience is affected, therefore, in the embodiment, the diffusion plate 51 is used for diffusing the light emitted from the polarization conversion element 3, so that the divergence angle of the finally obtained display screen is enlarged, and the viewing experience is improved; under the action of the diffusion sheet 51, light can generate a larger divergence angle, and light rays with large angles are difficult to effectively irradiate on the display element and are lost, so that the brightness of a picture can be reduced, and therefore, the light rays with large angles are collected and converged by the light condensing cover 52, so that the light rays with large angles can be fully irradiated on the display element 6, the utilization rate of the light is improved, and the brightness of the picture is ensured while the visual angle range is enlarged.

Further, the light emitting side of the polarization conversion element 3 is provided with a polarization element 53, specifically, the polarization element 53 is disposed between the light-collecting cover 52 and the display element 6, the polarization element 53 performs polarization detection and blocking functions, the display element 6 (for example, a transmissive LCD) can only use light with a single polarization state, due to dimensional errors or polarization separation efficiency of a polarization beam splitting interface, a small amount of light with different polarization states may be mixed with light emitted from the polarization conversion element, and blocking and removing are performed by using the polarization element, so that light finally emitted to the display element is precisely light with a desired polarization state, which is beneficial to improving contrast of a display screen, specifically, when light emitted from the polarization conversion element 3 is designed to be linear polarized light with an S polarization state, the polarization element 53 can block linear polarized light with a P polarization state only by the linear polarized light with the S polarization state; when the light emitted from the polarization conversion element 3 is specifically linearly polarized light in the P polarization state, the polarization element 53 can block the linearly polarized light in the S polarization state only by the linearly polarized light in the P polarization state, so that the light finally emitted to the display element 6 is ensured to be only linearly polarized light in the required single polarization state, and the contrast ratio of the display picture is improved.

Example III

As shown in fig. 7, on the basis of the first embodiment, the light-emitting side of the polarization conversion element 3 is provided with a fly-eye lens 54, the light-emitting side of the fly-eye lens 54 is further provided with a shaping lens group 55, the shaping lens group 55 at least comprises one lens, the fly-eye lens 54 and the shaping lens group 55 shape the light-emitting side of the polarization conversion element 3 and irradiate the display element 6, so that the light transmission efficiency is improved, the uniformity of the light irradiated on the display element 6 is improved, the shaping lens group 55 is preferably formed by combining three lenses, and the shaping effect is better;

similarly, the polarization conversion element 3 is provided with a polarization element 53 on the light emitting side, specifically, the polarization element 53 is disposed between the shaping lens group 55 and the display element 6, and the polarization element 53 is used to perform polarization detection and blocking, so that the light finally emitted to the display element 6 is only linearly polarized light with a single polarization state, and the contrast of the display picture is improved.

Example IV

As shown in fig. 8 to 9, a projection system includes the light source device according to any one of the first to third embodiments, specifically, light generated by the light source device is directed to the display element 6 to be modulated into image light by the display element 6, the image light is projected and imaged by the imaging system 7, the imaging system 7 specifically refers to components such as a projection lens, the projection system shown in fig. 8 to 9 is a single-channel projection system, that is, the light source device is only provided with one path, the light source device emits white light as a whole, the display element 6 is a single-chip full-color and transmissive liquid crystal screen, illumination light generated by the light source device irradiates the display element 6 to generate color image light, and then the image light is amplified and projected by the imaging system 7 to form a projection screen.

As shown in fig. 10 and 11, the projection system is a three-channel projection system, the light source device is configured with three groups, the light source device can be any one of the first to third embodiments, the light emitting units of the different light source devices respectively generate different colors of light, the light generated by each light source device is respectively emitted to one display element 6 to be modulated to obtain an image light with one color, the image light with various colors is subjected to light combination through a light combining device 8 and then is projected and imaged through an imaging system 7, the light emitting unit of the first light source device generates red light, the light emitting unit of the second light source device generates green light, the light emitting unit of the first light source device generates blue light, the first light source device emits to the first display element 6 (transmission type LCD) to be modulated to obtain red image light, the second light source device emits to the third display element 6 to be modulated to obtain blue image light, then the red image light, the green image light and the blue image light are combined through a light combining device 8 and then are subjected to light combination through a prism, the two-side prism lenses are respectively transmissive and the blue light can be respectively reflected by the prism, and the three-side prism lenses are respectively formed by the three-way prism imaging system, and the three-side prism imaging system can be respectively transmissive to the blue light and the blue light can be the blue light combined by the blue light.

As shown in fig. 12, the projection system is a three-channel projection system, and is different from the three-channel projection system shown in fig. 10 and 11 in that the light source device is only provided with one group, the light generated by the light source device is split into illumination light with different colors through the light splitting component 9, the illumination light with each color is respectively directed to one display element 6 to be modulated to obtain image light with each color, the image light with each color is combined by the light combining device 8 and then projected to be imaged by the imaging system 7, specifically, the light splitting component 9 comprises a plurality of light splitting sheets, the light source device integrally emits white light, the light emitted by the light source device is directed to the light splitting sheet 91 after being shaped by the lens one, the light splitting sheet 91 reflects red light and transmits blue green light, the red light reflected by the light splitting sheet one 91 is directed to the first display element 6 (transmissive LCD) through the reflection of the reflecting mirror one 93 and modulated to obtain red image light, the blue-green light transmitted from the first light splitting sheet 91 is shaped by the second lens and then is emitted to the second light splitting sheet 92, the second light splitting sheet 92 reflects green light and transmits blue light, the green light reflected by the second light splitting sheet 92 is guided to the second display element 6 to be modulated to obtain green image light, the blue light transmitted from the second light splitting sheet 92 is sequentially guided to the third display element 6 to be modulated by the reflection effect of the second and third reflectors 94 and 95 to obtain blue image light, then the red image light, the green image light and the blue image light are combined by the light combining device 8, the light combining device 8 can be specifically formed by adopting a light combining prism which is formed by gluing four triangular prisms, the glued surface is plated with a light splitting film which has reflection or transmission characteristics on different colors of light respectively, for example, the light splitting films on two mutually perpendicular bonding surfaces are respectively blue-reflecting, red-reflecting, green-reflecting and red-reflecting, blue-reflecting, the red image light, the green image light and the blue image light can be effectively combined into color image light, and finally the color image light is projected and imaged by the imaging system 7.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that the above-mentioned preferred embodiment should not be construed as limiting the utility model, and the scope of the utility model should be defined by the appended claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the utility model, and such modifications and adaptations are intended to be comprehended within the scope of the utility model.

Claims (14)

1. The light source device is characterized by comprising a light emitting unit (1), a lens unit (2) and a polarization conversion element (3), wherein light emitted by the light emitting unit (1) is collimated by the lens unit (2) and then is emitted to the polarization conversion element (3) to be converted into linearly polarized light in a single polarization state by the polarization conversion element (3).

2. A light source device according to claim 1, characterized in that the polarization conversion element (3) comprises a polarization splitting interface (31), a reflection interface (32) and a half-wave plate (33), the polarization splitting interface (31) being inclined to the incident light from the lens unit (2), the polarization splitting interface (31) transmitting the linearly polarized light of the first polarization state and reflecting the linearly polarized light of the second polarization state, the linearly polarized light of the second polarization state being reflected by the reflection interface (32) and guided to exit in the same direction as the linearly polarized light of the first polarization state, and a half-wave plate (33) being provided on the exit light path of one of the linearly polarized light of the first polarization state and the linearly polarized light of the second polarization state so that the exit light of the polarization conversion element (3) is the linearly polarized light of the single polarization state.

3. The light source device according to claim 1, wherein a plurality of the light emitting units (1) are arranged in an array, and the lens units (2) are in one-to-one correspondence with the light emitting units (1).

4. A light source device according to claim 1, characterized in that the light emitting unit (1) is arranged on a heat dissipating substrate (4).

5. A light source device according to claim 1, characterized in that the light exit side of the polarization conversion element (3) is provided with a homogenizing element.

6. A light source device according to claim 5, characterized in that the homogenizing element is a diffuser (51).

7. A light source device according to claim 6, characterized in that the light exit side of the diffuser (51) is provided with a light collecting hood (52).

8. A light source device according to claim 5, characterized in that the homogenizing element is a fly eye lens (54).

9. The light source device according to claim 8, wherein the fly-eye lens (54) is further provided with a shaping lens group (55), and the shaping lens group (55) includes at least one lens.

10. A light source device according to claim 1, characterized in that the light exit side of the polarization conversion element (3) is provided with a polarizing element (53).

11. A projection system comprising a light source device as claimed in any one of claims 1 to 10.

12. A projection system according to claim 11, characterized in that the light generated by the light source means is directed towards the display element (6) to be modulated by the display element (6) into image light, which is projected by the imaging system (7) for imaging.

13. The projection system according to claim 12, wherein the light source devices are arranged in a plurality of groups, the light emitting units (1) of different light source devices respectively generate light with different colors, the light generated by each light source device respectively irradiates to one display element (6) to be modulated to obtain image light with one color, and the image light with each color is projected and imaged by the imaging system (7) after being combined by the light combining device (8).

14. The projection system according to claim 12, wherein the light generated by the light source device is split into illumination light with different colors by the light splitting assembly (9), the illumination light with each color is respectively emitted to one display element (6) to be modulated to obtain image light with each color, and the image light with each color is projected and imaged by the imaging system (7) after being combined by the light combining device (8).