CN216696958U - Projection system and projector - Google Patents
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- CN216696958U CN216696958U CN202123011878.XU CN202123011878U CN216696958U CN 216696958 U CN216696958 U CN 216696958U CN 202123011878 U CN202123011878 U CN 202123011878U CN 216696958 U CN216696958 U CN 216696958U
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- 238000005286 illumination Methods 0.000 claims abstract description 55
- 230000003287 optical effect Effects 0.000 claims description 10
- 238000009792 diffusion process Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The embodiment of the utility model provides a projection system and a projector, which comprise an illumination unit, a reflective display unit, a first triangular prism and a second triangular prism, wherein the first triangular prism is arranged on the reflective display unit; the first surface of the first triangular prism is arranged on the light-emitting side of the lighting unit, the second surface of the first triangular prism is arranged adjacent to the first surface of the second triangular prism, and the reflective display unit is arranged adjacent to the second surface of the second triangular prism; the illumination light emitted by the illumination unit reaches the reflective display unit after being transmitted by the first triangular prism and the second triangular prism; then, the reflective display unit emits image light, and the image light is output after being totally reflected by the second triangular prism. In the projection system, the second triangular prism is used for carrying out total reflection on the image light, so that the emergent efficiency of the light can be improved, the utilization rate of light energy is improved, and finally the brightness of the projection system can be improved.
Description
Technical Field
The embodiment of the utility model relates to the technical field of projection, in particular to a projection system and a projector.
Background
In recent years, projectors are gradually developed from professional applications to ultra-large screen high-resolution engineering projection and towards miniaturization, high integration and portability, and are widely integrated into various fields of production, teaching, cinema and family, so that the projectors become mainstream display technologies. However, in the current projection system, the light emitting efficiency of the image light is low, which results in low light energy utilization rate.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a projection system and a projector, which can improve the emergent efficiency of image light rays so as to improve the light energy utilization rate.
In a first aspect, one technical solution adopted in the embodiments of the present invention is: there is provided a projection system comprising: the display device comprises an illumination unit, a reflective display unit, a first triangular prism and a second triangular prism; the first surface of the first triangular prism is arranged on the light-emitting side of the lighting unit, the second surface of the first triangular prism is arranged adjacent to the first surface of the second triangular prism, and the reflective display unit is arranged adjacent to the second surface of the second triangular prism; the lighting unit is used for providing lighting rays; the first triangular prism is used for receiving the illumination light through a first surface of the first triangular prism, transmitting the illumination light to a second surface of the first triangular prism, and outputting the illumination light to a first surface of the second triangular prism through the second surface of the first triangular prism; the second triangular prism is used for receiving the illumination light through a first surface of the second triangular prism, transmitting the illumination light to a second surface of the second triangular prism, and outputting the illumination light to the reflective display unit through the second surface of the second triangular prism; the reflective display unit is used for receiving the illumination light and outputting image light with image information; the second triangular prism is also used for receiving the image light through a second surface of the second triangular prism and totally reflecting the image light to a third surface of the second triangular prism for outputting through a first surface of the second triangular prism.
In some embodiments, the second triangular prism is an isosceles right triangular prism.
In some embodiments, the second surface of the first triangular prism is attached to the first surface of the second triangular prism.
In some embodiments, the incident angle θ of the illumination light incident on the reflective display unit has the following relationship: d x sin θ ═ λ; where d is the pixel size of the reflective display unit and λ is the shortest wavelength in the illumination light.
In some embodiments, the reflective display unit is an LCOS or a DMD.
In some embodiments, the projection system further comprises a projection lens; the projection lens is arranged adjacent to a third surface of the second triangular prism.
In some embodiments, the illumination unit comprises a light source, a collimating module, and a dodging module; the light source, the collimation module, the dodging diffusion module and the first surface of the first triangular prism are sequentially arranged along a first optical axis.
In some embodiments, the collimating module comprises a collimating lens.
In some embodiments, the light homogenizing and diffusing module comprises at least one of a micro lens array, a diffuser and a light pipe.
In a second aspect, embodiments of the present invention further provide a projector including the projection system according to any one of the first aspect. Wherein.
The beneficial effects of the embodiment of the utility model are as follows: different from the situation of the prior art, an embodiment of the present invention provides a projection system and a projector, including an illumination unit, a reflective display unit, a first triangular prism, and a second triangular prism; the first surface of the first triangular prism is arranged on the light-emitting side of the lighting unit, the second surface of the first triangular prism is arranged adjacent to the first surface of the second triangular prism, and the reflective display unit is arranged adjacent to the second surface of the second triangular prism; the illumination light emitted by the illumination unit reaches the reflective display unit after being transmitted by the first triangular prism and the second triangular prism; then, the reflective display unit emits image light, and the image light is output after being totally reflected by the second triangular prism. In the projection system, the second triangular prism is used for carrying out total reflection on the image light, so that the emergent efficiency of the light can be improved, the utilization rate of light energy is improved, and finally the brightness of the projection system can be improved.
Drawings
One or more embodiments are illustrated by the accompanying figures in the drawings that correspond thereto and are not to be construed as limiting the embodiments, wherein elements/modules and steps having the same reference numerals are represented by like elements/modules and steps, unless otherwise specified, and the drawings are not to scale.
FIG. 1 is a schematic diagram of a projection system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the optical path of FIG. 1;
FIG. 3 is a schematic diagram of an optical path on a reflective display unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another optical path on a reflective display unit according to an embodiment of the present invention;
fig. 5 is a schematic diagram of another optical path on a reflective display unit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the utility model, but are not intended to limit the utility model in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the utility model. All falling within the scope of the present invention.
In order to facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific embodiments. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that, if not conflicted, the various features of the embodiments of the utility model may be combined with each other within the scope of protection of the present application. In addition, although the functional blocks are divided in the device diagram, in some cases, the blocks may be divided differently from those in the device. Further, the terms "first," "second," and the like, as used herein, do not limit the data and the execution order, but merely distinguish the same items or similar items having substantially the same functions and actions.
In a first aspect, an embodiment of the utility model provides a projection system, referring to fig. 1, the projection system includes: an illumination unit 10, a first triangular prism 20, a second triangular prism 30, and a reflective display unit 40. The first surface of the first triangular prism 20 is disposed on the light emitting side of the illumination unit 10, the second surface of the first triangular prism 20 is disposed adjacent to the first surface of the second triangular prism 30, and the reflective display unit 40 is disposed adjacent to the second surface of the second triangular prism 30.
Referring to fig. 2, the lighting unit 10 is used for providing a lighting light L1; the first triangular prism 20 is configured to receive the illumination light L1 through a first surface of the first triangular prism 20, transmit the illumination light L1 to a second surface of the first triangular prism 20, and output the illumination light L1 through the second surface of the first triangular prism 20 to a first surface of the second triangular prism 30; the second triangular prism 30 is configured to receive the illumination light L1 through a first surface of the second triangular prism 30, transmit the illumination light L1 to a second surface of the second triangular prism 30, and output the illumination light L1 to the reflective display unit 40 through the second surface of the second triangular prism 30; the reflective display unit 40 is used for receiving the illumination light L1 and outputting image light L2 with image information; the second triangular prism 30 is further configured to receive the image light L2 through the second surface of the second triangular prism 30, and reflect the image light L2 to the third surface of the second triangular prism 30 for output.
Specifically, the first surface of the second triangular prism 30 is provided with a reflective film for totally reflecting the image light L2 to the third surface of the second triangular prism 30. In the projection system, an illumination light L1 emitted from the illumination unit 10 exits to a first surface of the first triangular prism 20, and the illumination light L1 is transmitted to a first surface of the second triangular prism 30 by the first triangular prism 20; then, the illumination light L1 is transmitted to the reflective display unit 40 by the second triangular prism 30; then, the reflective display unit 40 receives the illumination light L1 to generate an image light L2, and outputs the image light L2 to the second triangular prism 30; finally, the image light L2 is totally reflected by the second triangular prism 30 to the third surface of the second triangular prism 30 for output.
In this projection system, the second triangular prism 30 totally reflects the image light L2, so that the light emitting efficiency can be improved, the light energy utilization rate can be improved, and finally the brightness of the projection system can be improved.
In some of these embodiments, the second triangular prism is an isosceles right triangular prism.
In order to increase the compactness of the system, in some embodiments, please continue to refer to fig. 1, the second surface of the first triangular prism 20 is attached to the first surface of the second triangular prism 30. The projection system can be made more compact by attaching the second surface of the first triangular prism 20 and the first surface of the second triangular prism 30.
In some of these embodiments, the reflective display unit is an LCOS or a DMD. The LCOS can modulate various parameters of amplitude, phase, polarization and the like of incident light waves due to the special properties of optical birefringence, dielectric anisotropy and the like of liquid crystals, and can realize functions of light intensity, wave front modulation and the like by selecting the arrangement mode of the liquid crystals. As an example, a spatial light modulation type LCOS chip is selected as a reflective display unit in a projection system, wherein the spatial light modulation type LCOS chip modulates illumination light based on a spatial light modulator and outputs image light with image information.
In some embodiments, the incident angle θ of the illumination light incident on the reflective display unit has the following relationship:
d*sinθ＝λ；
where d is the pixel size of the reflective display unit and λ is the shortest wavelength in the illumination light.
Specifically, referring to fig. 3, when the spatial light modulation type LCOS chip is used as the reflective display unit 40, a digital grating 41 is usually disposed on the spatial light modulation type LCOS chip, and the light beam is deflected by diffraction of the digital grating 41 to output image light, however, when the illumination light L1 is incident on the spatial light modulation type LCOS chip, as shown in fig. 3, due to diffraction effect of the grating, reflected light of different orders may appear, in fig. 3, + 1-order light L21 and-1-order light L22 are required image light L2, which may be used for subsequent projection, and 0-order light L0 may bring optical noise to affect final projection quality.
When the illumination light L1 enters the reflective display unit 40 and enters at the incident angle θ, referring to fig. 4, the illumination light L1 also has different levels of reflected light, but at this time, the 0-level light L0 will not be mixed in the 1-level light L2, and only the 1-level light L2 can reenter the second triangular prism, and the 0-level light L0 is outside the modulation range, so that the optical noise can be reduced and the projection quality of the projection system can be improved. Where N is a normal to the surface of the reflective display unit 40.
In some embodiments, referring to fig. 5, the projection system further includes a projection lens 50; the projection lens 50 is disposed adjacent to the third face of the second triangular prism 30. Specifically, the projection lens 50 includes at least one shaping lens, and by providing the shaping lens, the image light L2 emitted from the polarization splitting prism can be shaped, so that the image light L2 is projected and imaged.
In some of these embodiments, the lighting unit comprises a light source, a collimating module, and a dodging module; the light source, the collimation module, the dodging diffusion module and the first surface of the first triangular prism are sequentially arranged along a first optical axis. In the lighting unit, the light source emits lighting rays, the collimation module can collimate the lighting rays, and then the dodging diffusion module can dodge and diffuse the lighting rays, so that the lighting area of the lighting rays is increased, and the uniformity of the lighting rays is improved. In particular, the light source may be an LED light source or any other suitable light source that can be used to provide illumination light.
In some of these embodiments, the collimating module includes a collimating lens. The collimating lens is arranged between the light source and the dodging diffusion module and can be used for collimating the illumination light. In practical applications, the devices used in the collimating module can be set according to actual needs, and are not limited to the limitations of the present embodiment.
In some embodiments, the dodging module includes at least one of a microlens array, a diffuser and a light pipe. Wherein, the micro lens array can be a fly eye lens. In practical applications, the devices used in the uniform light diffusion module can be arranged according to actual needs, and are not limited to the limitations in this embodiment.
In a second aspect, embodiments of the present invention further provide a projector including the projection system according to any one of the first aspect. In the projector, the illumination light emitted by the illumination unit reaches the reflective display unit after being transmitted by the first triangular prism and the second triangular prism; then, the reflective display unit emits image light, the image light is output after being totally reflected by the second triangular prism, and the projector can improve the emergent efficiency of the light by totally reflecting the image light by the second triangular prism, so that the utilization rate of light energy is improved, and finally the brightness of a projection system can be improved.
The embodiment of the utility model provides a projection system and a projector, which comprise an illumination unit, a reflective display unit, a first triangular prism and a second triangular prism, wherein the first triangular prism is arranged on the reflective display unit; the first surface of the first triangular prism is arranged on the light-emitting side of the lighting unit, the second surface of the first triangular prism is arranged adjacent to the first surface of the second triangular prism, and the reflective display unit is arranged adjacent to the second surface of the second triangular prism; the illumination light emitted by the illumination unit reaches the reflective display unit after being transmitted by the first triangular prism and the second triangular prism; then, the reflective display unit emits image light, and the image light is output after being totally reflected by the second triangular prism. In this projection system, carry out the total reflection to image light through letting second triangular prism, can promote the exit efficiency of light to improve the utilization ratio of light energy, finally can improve projection system's luminance.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the utility model, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the utility model as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A projection system, comprising: the display device comprises an illumination unit, a reflective display unit, a first triangular prism and a second triangular prism;
the first surface of the first triangular prism is arranged on the light-emitting side of the lighting unit, the second surface of the first triangular prism is arranged adjacent to the first surface of the second triangular prism, and the reflective display unit is arranged adjacent to the second surface of the second triangular prism;
the lighting unit is used for providing lighting rays;
the first triangular prism is used for receiving the illumination light through a first surface of the first triangular prism, transmitting the illumination light to a second surface of the first triangular prism, and outputting the illumination light to a first surface of the second triangular prism through the second surface of the first triangular prism;
the second triangular prism is used for receiving the illumination light through a first surface of the second triangular prism, transmitting the illumination light to a second surface of the second triangular prism, and outputting the illumination light to the reflective display unit through the second surface of the second triangular prism;
the reflective display unit is used for receiving the illumination light and outputting image light with image information;
the second triangular prism is also used for receiving the image light through a second surface of the second triangular prism and totally reflecting the image light to a third surface of the second triangular prism for outputting through a first surface of the second triangular prism.
2. The projection system of claim 1, wherein the second triangular prism is an isosceles right triangular prism.
3. The projection system of claim 2, wherein the second surface of the first triangular prism is attached to the first surface of the second triangular prism.
4. The projection system of claim 3, wherein the angle of incidence θ of the illumination light upon incidence on the reflective display unit has the following relationship:
d*sinθ＝λ；
where d is the pixel size of the reflective display unit and λ is the shortest wavelength in the illumination light.
5. The projection system of any of claims 1-4, wherein the reflective display unit is an LCOS or DMD.
6. The projection system of claim 5, further comprising a projection lens;
the projection lens is arranged adjacent to a third surface of the second triangular prism.
7. The projection system of any of claims 1-4, wherein the illumination unit comprises a light source, a collimating module, and a dodging module;
the light source, the collimation module, the dodging diffusion module and the first surface of the first triangular prism are sequentially arranged along a first optical axis.
8. The projection system of claim 7, wherein the collimating module comprises a collimating lens.
9. The projection system of claim 7, wherein the dodging module comprises at least one of a micro-lens array, a diffuser and a light pipe.
10. A projector comprising a projection system as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123011878.XU CN216696958U (en) | 2021-12-02 | 2021-12-02 | Projection system and projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123011878.XU CN216696958U (en) | 2021-12-02 | 2021-12-02 | Projection system and projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216696958U true CN216696958U (en) | 2022-06-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123011878.XU Active CN216696958U (en) | 2021-12-02 | 2021-12-02 | Projection system and projector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216696958U (en) |
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2021
- 2021-12-02 CN CN202123011878.XU patent/CN216696958U/en active Active
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Effective date of registration: 20231226 Granted publication date: 20220607 |