This application claims the priority benefit of China application serial no. 202210035633.0 filed on Jan. 13, 2022. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
The present disclosure relates to an illumination system and a projection apparatus.
A projector can provide a large display screen with a small size, and compared with a large-sized display, the projector can project images onto a large screen at a lower cost, so the projector plays an important role in the display field. The light combining assembly of the illumination system in the projector makes the excitation beam and the excited beam combine and enter the light-uniforming element to provide an illumination beam. A good light combining system can provide better efficiency and uniformity.
In the conventional technology, an anisotropic light-expanding element is further arranged in front of the wavelength conversion device in the illumination system, to adjust the spot of the excitation beam to be an anisotropic spot that matches the incident surface and light valve of the light-uniforming element light, such as rectangular or elliptical spots. In such cases, the excited beam will also have anisotropic spots. If the number of reflections performed to the excitation beam and the excited beam before the light-uniforming element is different, the long axes of the spot of the excitation beam and the excited beam on the light incident surface of the light-uniforming element might not be parallel. As a result, the spot of the excitation beam or the excited beam will not match the shape of the light incident surface of the light-uniforming element, the light-combining efficiency will be reduced, and the brightness, color and uniformity of the projector will be affected.
The information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Further, the information disclosed in the Background section does not mean that one or more problems to be resolved by one or more embodiments of the disclosure was acknowledged by a person of ordinary skill in the art.
The present disclosure provides an illumination system and a projection apparatus. The long axes of the spots of the excitation beam and the excited beam are substantially parallel, and the projection apparatus has high brightness, good color performance and good uniformity.
Other objects and advantages of the present disclosure can be further understood from the technical features disclosed in the present disclosure.
In order to achieve one or part or all of the above purposes or other purposes, according to an embodiment of the present disclosure, an illumination system is provided, and is configured to provide an illumination beam. The illumination system includes a light source, a wavelength conversion device and a first light-uniforming element. The light source emits an excitation beam. The wavelength conversion device includes at least one light wavelength conversion region and at least one transmission region. The light wavelength conversion region and the transmission region sequentially insert on the transmission path of the excitation beam at different time periods. When the light wavelength conversion region inserts on the transmission path of the excitation beam, the light wavelength conversion region converts the excitation beam into a conversion beam, and the conversion beam is reflected by the light wavelength conversion region. When the transmission region inserts on the transmission path of the excitation beam, the excitation beam passes through the transmission region and becomes a non-conversion excitation beam. The first light-uniforming element is arranged on the transmission path of the conversion beam and the non-conversion excitation beam. The illumination beam is formed after the non-conversion excitation beam and the conversion beam penetrate the first light-uniforming element. The conversion beam is reflected for X time(s) on the transmission path between the wavelength conversion device and the first light-uniforming element, and the non-conversion excitation beam is reflected for Y time(s) on the transmission path between the wavelength conversion device and the first light-uniforming element, and Y−X=2N and N is a positive integer greater than or equal to 1.
According to another embodiment of the present disclosure, a projection apparatus is provided, including an illumination system, a light valve, and a projection lens. The illumination system provides an illumination beam. The light valve is arranged on the transmission path of the illumination beam to convert the illumination beam into an image beam. The projection lens is arranged on the transmission path of the image beam to project the image beam out of the projection apparatus.
Based on the above, in the illumination system provided by the embodiment of the present disclosure, the conversion beam is reflected for X time(s) on the transmission path between the wavelength conversion device and the first light-uniforming element, and the non-conversion excitation beam is reflected for Y time(s) on the transmission path between the wavelength conversion device and the first light-uniforming element, and Y−X=2N and N is a positive integer greater than or equal to 1. As such, the long axes of spots of the non-conversion excitation beam and the conversion beam (excited beam) are substantially parallel to each other. The projections of both the non-conversion excitation beam and the conversion beam on the light-incident surface of the light-uniforming element match the shape of the light-incident surface of the light-uniforming element, and the light-combining efficiency is high. Therefore, the projection apparatus has high brightness, good color performance and good uniformity.
In order to make the above-mentioned features and advantages of the present disclosure more comprehensible, the following examples are given and described in detail with the accompanying drawings as follows.
Other objectives, features and advantages of the present disclosure will be further understood from the further technological features disclosed by the embodiments of the present disclosure wherein there are shown and described preferred embodiments of this disclosure, simply by way of illustration of modes best suited to carry out the disclosure.
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate examples of the disclosure and, together with the description, serve to explain the principles of the disclosure.
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the disclosure may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” etc., is used with reference to the orientation of the Figure(s) being described. The components of the present disclosure can be positioned in a number of different orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of components may be exaggerated for clarity. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present disclosure. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of descript ion and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Similarly, the terms “facing,” “faces” and variations thereof herein are used broadly and encompass direct and indirect facing, and “adjacent to” and variations thereof herein are used broadly and encompass directly and indirectly “adjacent to”. Therefore, the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component or one or more additional components are between “A” component and “B” component. Also, the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
The foregoing and other technical contents, features and effects of the present disclosure will be clearly presented in the following detailed description of a preferred embodiment with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only for referring to the directions of the attached drawings. Accordingly, the directional terms used are illustrative and not limiting of the present disclosure.
Referring to
According to an embodiment, the light wavelength conversion regions 1021 and 1022 may be respectively configured with wavelength conversion materials corresponding to different wavelength ranges. For example, the excitation beam L1 is a blue light beam. The excitation beam L1 incident on the light wavelength conversion region 1021 may be converted into a light beam in the red wavelength range, that is, the conversion beam L3 reflected by the light wavelength conversion region 1021 is a red light beam. The excitation beam L1 incident on the light wavelength conversion region 1022 may be converted into a light beam in the green wavelength range, that is, the conversion beam L3 reflected by the light wavelength conversion region 1022 is a green light beam. According to another embodiment, 1021 and 1022 may be configured with wavelength conversion materials corresponding to the same wavelength range. For example, the excitation beam L1 is a blue light beam. The excitation beam L1 incident on the light wavelength conversion regions 1021 and 1022 may be converted into light beams in the yellow wavelength range, that is, the conversion beams L3 reflected by the light wavelength conversion regions 1021 and 1022 are all yellow light beams.
Also referring to
Specifically, the illumination system 100 further includes a light combining assembly 105 and a light transmission assembly. The light combining assembly 105 includes a first dichroic element 1051. The first dichroic element 1051 is, for example, a dichroic mirror, the excitation beam L1 and the non-conversion excitation beam L2 with the same wavelength range may penetrate the first dichroic element 1051, and the conversion beam L3 with a different wavelength range may be reflected by the first dichroic element 1051. In this embodiment, the first dichroic element 1051 is, for example, a dichroic mirror that allows the blue light beam to pass through and reflects other light beams with different colors. In
In this embodiment, the illumination system 100 further includes a second light-uniforming element 104, which is disposed on the transmission path of the excitation beam L1 and located between the light source 101 and the wavelength conversion device 102. In this embodiment, the second light-uniforming element 104 is an anisotropic light-uniforming element, and the second light-uniforming element 104 may be, for example, a microlens array, a wedge element, an anisotropic diffuser or the like. After the excitation beam L1 from the light source 101 penetrates the second light-uniforming element 104, the spot of the excitation beam L1 on the plane (Y-Z plane) perpendicular to a transmission direction (direction −X) of the excitation beam L1 is non-circularly symmetric, that is, the spot of the excitation beam L1 is a rectangular or elliptical spot having a long axis and a short axis, such as the elliptical spot shown in
The illumination system 100 may further include at least one lens TL disposed on the transmission paths of the excitation beam L1, the non-conversion excitation beam L2 and the conversion beam L3 to optimize the optical properties of the illumination beam L4. It should be noted that the non-circularly symmetric spot of the excitation beam L1 is not limited to the elliptical shape, and in other embodiments, the non-circularly symmetric spot of the excitation beam L1 may have a rectangular shape. In other embodiments, the second light-uniforming element 104 may also be an isotropic light-uniforming element.
In the present embodiment, the light transmission assembly is disposed on the transmission path of the non-conversion excitation beam L2 between the wavelength conversion device 102 and the first light-uniforming element 103. On the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103, there are, for example, three reflection regions RA1, RA2, RA3, and the mirror M1 is located in the first reflection region RA1, for example, to change the transmission direction of the non-conversion excitation beam L2 from the wavelength conversion device 102 once. The mirrors M2 and M3 are located in the second reflection region RA2, for example, to change the transmission direction of the non-conversion excitation beam L2 from the first reflection region RA1 twice. The mirror M4 is located in the third reflection region RA3, for example, to change the transmission direction of the non-conversion excitation beam L2 from the second reflection region RA1 once, and subsequently the non-conversion excitation beam L2 passes through the first dichroic element 1051 and the first light-uniforming element 103. In other embodiments, two mirrors may be configured in the first reflection region RA1, or/and two mirrors may be configured in the third reflection region RA3. The present disclosure is not limited thereto, as long as the total number the non-conversion excitation beam L2 is reflected in the three reflection regions RA1, RA2, and RA3 on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is an even number, so that the difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is a multiple of 2, they all fall within the scope of the present disclosure.
In order to fully illustrate the various embodiments of the present disclosure, other embodiments of the present disclosure will be described below. It should be noted here that the following embodiments use the element numbers and part of the contents of the previous embodiments, wherein the same numbers are used to represent the same or similar elements, and the description of the same technical contents is omitted. For the description of the omitted part, reference may be made to the foregoing embodiments, and the repetition will not be incorporated.
Referring to
In this embodiment, the conversion beam L3 is reflected twice on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103, and the non-conversion excitation beam L2 is reflected for four times on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103. The difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is 2.
Since the difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is 2 (even number), the long axis of the spot of the non-conversion excitation beam L2 on the light incident surface 1031 of the first light-uniforming element 103 is substantially parallel to the long axis of the spot of the conversion beam L3. With the proper configuration of the first light-uniforming element 103, the spot projected by the non-conversion excitation beam L2 on the light incident surface 1031 of the first light-uniforming element 103, the spot projected by the conversion beam L3 on the light incident surface 1031 of the first light-uniforming element 103, and the light incident surface 1031 may have the maximum overlapping area, so that the illumination system 200 may have good efficiency and uniformity.
Referring to
Please refer to
The conversion beam L3 reflected by the light wavelength conversion regions 1021 and 1022 is reflected by the second dichroic element 3052, penetrates the first dichroic element 3051, and enters the first light-uniforming element 103. Therefore, the conversion beam L3 is reflected twice on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103. The non-conversion excitation beam L2 from the transmission region 1023 is sequentially reflected by the mirror M1, the mirror M2, and the mirror M3, then reflected by the first dichroic element 3051 and enters the first light-uniforming element 103. Therefore, the non-conversion excitation beam L2 is reflected for four times on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103. The difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is 2.
Since the difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is 2 (even number), the long axis of the spot of the non-conversion excitation beam L2 on the light incident surface 1031 of the first light-uniforming element 103 is substantially parallel to the long axis of the spot of the conversion beam L3. With the proper configuration of the first light-uniforming element 103, the spot projected by the non-conversion excitation beam L2 on the light incident surface 1031 of the first light-uniforming element 103, the spot projected by the conversion beam L3 on the light incident surface 1031 of the first light-uniforming element 103, and the light incident surface 1031 may have the maximum overlapping area, so that the illumination system 300 may have good efficiency and uniformity.
Referring to
Please refer to
The conversion beam L3 is reflected by the light wavelength conversion regions 1021 and 1022 and then travels in the direction X, and is reflected by the first dichroic element 4051 and then travels in the direction −Y, and enters the first light-uniforming element 103. Therefore, the conversion beam L3 is reflected twice on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103. The non-conversion excitation beam L2 is sequentially reflected by the mirror M1, the mirror M2, and the mirror M3 on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103, and then reflected by the reflective element 4052 and enters the first light-uniforming element 103 (reflected for 4 times in total). Specifically, the non-conversion excitation beam L2 traveling in the direction −X is reflected by the mirror M1 and then travels toward the direction Z. The non-conversion excitation beam L2 traveling in the direction Z is reflected by the mirror M2 and then travels in the direction X. The non-conversion excitation beam L2 traveling in the direction X is reflected by the mirror M3 and then travels in the direction −Z. The non-conversion excitation beam L2 traveling in the direction −Z is reflected by the reflective element 4052 of the light combining assembly 405 and then travels in the direction −Y, and enters the first light-uniforming element 103. The difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is 2.
Since the difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is 2 (even number), the long axis of the spot of the non-conversion excitation beam L2 and the long axis of the spot of the conversion beam L3 on the light incident surface 1031 of the first light-uniforming element 103 are substantially parallel to each other. With the proper configuration of the first light-uniforming element 103, the spot projected by the non-conversion excitation beam L2 on the light incident surface 1031 of the first light-uniforming element 103, the spot projected by the conversion beam L3 on the light incident surface 1031 of the first light-uniforming element 103, and the light incident surface 1031 may have the maximum overlapping area, so that the illumination system 400 may have good efficiency and uniformity.
In this embodiment, the first dichroic element 4051 is arranged along the diagonal line of the reflective element 4052, and the reflective element 4052 is arranged along the diagonal line of the first dichroic element 4051, so the first dichroic element 4051 and the reflective element 4052 are arranged in an X-shaped configuration.
Referring to
Please refer to
The conversion beam L3 reflected by the light wavelength conversion regions 1021 and 1022 penetrates the first dichroic element 5051 and enters the first light-uniforming element 103. Therefore, the conversion beam L3 is reflected once on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103. The non-conversion excitation beam L2 from the transmission region 1023 is sequentially reflected by the mirror M1, the mirror M2, the mirror M3, and the mirror M4, then reflected by the first dichroic element 5051 and enters the first light-uniforming element 103. Therefore, the non-conversion excitation beam L2 is reflected for five times on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103. The difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is four.
Since the difference in the number of times the conversion beam L3 and the non-conversion excitation beam L2 are reflected on the transmission path between the wavelength conversion device 102 and the first light-uniforming element 103 is 4 (even number), the long axis of the spot of the non-conversion excitation beam L2 and the long axis of the spot of the conversion beam L3 on the light incident surface 1031 of the first light-uniforming element 103 are substantially parallel to each other. With the proper configuration of the first light-uniforming element 103, the spot projected by the non-conversion excitation beam L2 on the light incident surface 1031 of the first light-uniforming element 103, the spot projected by the conversion beam L3 on the light incident surface 1031 of the first light-uniforming element 103, and the light incident surface 1031 may have the maximum overlapping area, so that the illumination system 500 may have good efficiency and uniformity.
Referring to
To sum up, in the illumination system provided by the embodiments of the present disclosure, the conversion beam is reflected for X time(s) on the transmission path between the wavelength conversion device and the first light-uniforming element, and the non-conversion excitation beam is reflected for Y time(s) on the transmission path between the wavelength conversion device and the first light-uniforming element, and Y−X=2N, N is a positive integer greater than or equal to 1, so that the long axes of the spots of both the non-conversion excitation beam and the conversion beam on the light incident surface of the light-uniforming element are substantially parallel to each other, match the shape of the light incident surface of the light-uniforming element, and the light combining efficiency is high. Therefore, the projection apparatus provided with the above-mentioned illumination system has high brightness, good color performance and good uniformity.
The foregoing description of the preferred embodiments of the disclosure has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the disclosure to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the disclosure and its best mode practical application, thereby to enable persons skilled in the art to understand the disclosure for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the disclosure be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the disclosure”, “the present disclosure” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the disclosure does not imply a limitation on the disclosure, and no such limitation is to be inferred. The disclosure is limited only by the spirit and scope of the appended claims. Moreover, these claims may refer to use “first”, “second”, etc. following with noun or element. Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the disclosure. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present disclosure as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.
Number | Date | Country | Kind |
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202210035633.0 | Jan 2022 | CN | national |