WO2016016076A1

WO2016016076A1 - Light source apparatus and optical imaging and displaying device using the light source apparatus

Info

Publication number: WO2016016076A1
Application number: PCT/EP2015/066849
Authority: WO
Inventors: Yi Ding; Junwei MAO; Qing KANG
Original assignee: Osram Gmbh
Priority date: 2014-08-01
Filing date: 2015-07-23
Publication date: 2016-02-04
Also published as: CN105301879A

Abstract

The present disclosure provides a light source apparatus and an optical imaging and displaying devices including the light source apparatus. The light source apparatus includes a substrate capable of rotating around its axe and having a surface on which a wavelength conversion zone is provided, and an light path conversion device, wherein the substrate is arranged at a predetermined angle relative to a surface on which the light source apparatus is located, and the light path conversion device is configured to direct an incoming light beam from a first light emitting unit to an optical processing part which is on the surface of the substrate and includes the wavelength conversion zone, and to direct the wavelength-converted light beam to a light receiving device.

Description

LIGHT SOURCE APPARATUS AND OPTICAL IMAGING AND DISPLAYING DEVICE USING THE LIGHT SOURCE APPARATUS

FIELD OF THE INVENTION

[0001] The present disclosure relates generally to the field of optics, more specifically to projection technology, and especially to a light source apparatus and an optical imaging and displaying device using the light source apparatus.

BACKGROUND OF THE INVENTION

[0002] A projector is an optical imaging and displaying device for enlarging displayed images, widely used at homes, offices, schools and entertainment venues. The principle of the projector consists in separating the light of a projector light into the three colors, red, green and blue; generating an image with multiple colors; and projecting it onto a screen through a lens. The separation of colors may be performed using a color wheel (color disk). Specifically, a ring-shaped zone of the color wheel is coated with phosphor that excites red, green and blue lights from the light beam emitted from the light source; and when rotated by a high-speed motor, the color wheel sequentially generates different monochromatic lights in a predetermined light path.

[0003] A light source system is an important and basic component in a projector. In order to improve the efficiency of the light source system of the projector, reduce power consumption and reduce the size of the projector at the same time, laser source technology has been introduced. By using a laser as the light source of the projector, the displayed image has a wider color gamut and a higher color saturation, and the projector also has the advantages including long life time, low cost and low power consumption etc.. However, as the power of the laser continues to increase, the diameter of the color wheel has to be increased accordingly in order to ensure the performance and life time of the color wheel. When the diameter of the color wheel is larger than the size of the projector in the radial direction of the color wheel, the size of the diameter of the color wheel becomes a bottleneck in terms of physical compactness of the projector. [0004] In order to solve the above problem, a prior art document JP 5272842B2 discloses a light source apparatus. As seen from Figure 1, the edge of a color wheel 10 is thickened, and the edge of the color wheel is coated with phosphor.

[0005] Similarly, a prior art document WO 2011160680A1 also discloses a light source apparatus. As shown in Figure 2, the thickened edge of a color wheel 20 is coated with phosphor, and a white light source illuminates the edge of the color wheel at a predetermined angle.

[0006] Although both of the above prior art solutions can solve the problem of increasing the diameter of the color wheel as the power of the laser increases, by coating the thickened edge of the color wheel with phosphor, however, the thickened edge leads to structural complexity and increased cost.

SUMMARY OF THE INVENTION

[0007] In order to solve the above problem in the prior art, according to an aspect, the present disclosure provides a light source apparatus including a substrate capable of rotating around its axe and having a surface on which a wavelength conversion zone is provided, and an light path conversion device, wherein the substrate is arranged at a predetermined angle relative to a surface on which the light source apparatus is located, and the light path conversion device is configured to direct an incoming light beam from a first light emitting unit to an optical processing part which is on the surface of the substrate and includes the wavelength conversion zone, and to direct the wavelength-converted light beam to a light receiving device.

[0008] Optionally, the substrate is a color wheel.

[0009] Optionally, he predetermined angle is greater than or equal to 0 degree and less than 90 degrees.

[0010] Optionally, the light path conversion device is configured to reflect the wavelength-converted light beam to the light receiving device.

[0011] Optionally, the light path conversion device includes a first optical element, a second optical element, a third optical element and a fourth optical element, and wherein the first optical element, the second optical element and the third optical element are arranged into a T-shape where the first optical element is perpendicular to the second optical element and to the third optical element, and the fourth optical element is located between the substrate and the first, second and third optical elements, so that the incoming light beam is firstly reflected by the first optical element, and secondly transmitted through the second optical element and transmitted through the fourth optical element, and is directed to the optical processing part, and the wavelength-converted light beam is directed by the third optical element and the second optical element to the light receiving device.

[0012] Optionally, the first optical element is a reflecting mirror, the second optical element is a dichroic mirror or a color splitting/recombining prism X-cube, the fourth optical element is a lens, and the third optical element is: a reflecting mirror, so that the wavelength-converted light beam, or both the wavelength-converted light beam and a portion of the incoming light beam that is reflected by the substrate, is transmitted through the fourth optical element and then reflected by the third optical element to the light receiving device; or a dichroic mirror or a color splitting/recombining prism X-cube, so that the wavelength-converted light beam is transmitted through the fourth optical element and then reflected by the third optical element to the light receiving device, and a portion of the incoming light beam that is reflected by the substrate is transmitted through the fourth optical element and then transmitted through the third optical element without being directed to the light receiving device.

[0013] Optionally, a light source apparatus according to the present disclosure includes also a fifth optical element, which is configured to reflect a light beam from a second light emitting unit that is different from the first light emitting unit directly to the light receiving device.

[0014] Optionally, the fifth optical element is a dichroic mirror or color splitting/recombining prism X-cube. [0015] Optionally, the optical processing part on the surface of the substrate includes also a reflection zone, which is configured to reflect a portion of the incoming light beam that is directed to the reflection zone so as to obtain a light beam output from the substrate in a time sequential manner, wherein the intensity of the reflected light beam is adjustable according to a ratio between the reflection zone and the wavelength conversion zone. [0016] Optionally, the optical processing part on the surface of the substrate includes also a reflection zone, which is configured to reflect a portion of the incoming light beam that is directed to the reflection zone, wherein the incoming light beam is directed to the common border between the reflection zone and the wavelength conversion zone so as to obtain a light beam output continuously from the substrate.

[0017] Optionally, the second optical element is configured such that a light beam from a third light emitting unit is directly transmitted through the second optical element, and arrives at the light receiving device, and wherein the third light emitting unit being different from the first light emitting unit and the second light emitting unit.

[0018] According to another aspect of the present disclosure, an optical imaging and displaying device including a light source apparatus according to the present disclosure is provided. Optionally, the optical imaging and displaying device is a projector.

[0019] By using the light source apparatus according to the present disclosure, the substrate such as a color wheel is rotated at a certain angle and optical elements are appropriately arranged to direct the incoming light beam to the light receiving device, so that the diameter of the color wheel is increased to stand a higher incoming laser power, without affecting the compactness and simplicity of the projector; in addition, when used with a laser source, a light source apparatus according to the present disclosure realizes a continuous light output by simply shifting the color wheel slightly in the radial direction.

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above aspects, advantages and characteristics and other advantages and characteristics will become apparent from the detailed description below, in conjunction with the accompanying drawings, wherein:

[0021] Figure 1 schematically illustrates the configuration of a light source apparatus in the prior art;

[0022] Figure 2 schematically illustrates the configuration of a light source apparatus in the prior art;

[0023] Figure 3 schematically illustrates a side view of a light source apparatus according to an embodiment of the present disclosure; [0024] Figure 4 illustrates the light source apparatus of Figure 3, where only the light path of a portion of the incoming light beam, which is not wavelength-converted by the corlor wheel, is shown;

[0025] Figure 5 schematically illustrates a side view of a light source apparatus according to another embodiment of the present disclosure;

[0026] Figure 6 schematically illustrates an example of the layout of the color wheel of the light source apparatus according to embodiments of the present disclosure;

[0027] Figure 7 schematically illustrates a side view of a light source apparatus according to yet another embodiment of the present disclosure;

[0028] Figure 8 schematically illustrates the coverage of the wavelength-converted light beam in the light source apparatus of Figure 7;

[0029] Figure 9 schematically illustrates another example of the layout of the color wheel of the light source apparatus according to embodiments of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] The present disclosure will be described in detail hereinafter with reference to the accompanying drawings. The accompanying drawings and specific embodiments herein are for illustrative purposes only and exemplary, and shall not be interpreted as limiting the present disclosure. Additionally, the same or similar elements are designated by the same or similar reference signs throughout the accompanying drawings.

[0031] According to an embodiment of the present disclosure, the light source apparatus includes a substrate capable of rotating around its axe and having a surface on which a wavelength conversion zone is provided, and an light path conversion device, wherein the substrate is arranged at a predetermined angle relative to a surface on which the light source apparatus is located, and the light path conversion device is configured to direct an incoming light beam from a first light emitting unit to an optical processing part which is on the surface of the substrate and includes the wavelength conversion zone, and to direct the wavelength-converted light beam to a light receiving device.

[0032] Figure 3 schematically illustrates a side view of an specific example of a light source apparatus according to an embodiment of the present disclosure. As shown in Figure 3, in the present example, the substrate may be, for example, a color wheel 100 driven by a driving device to rotate around its axe (not shown). The wavelength conversion zone may be made of wavelength conversion materials such as phosphor or quantum dot. The light path conversion device includes optical elements 1, 2, 3 and 4, the first light emitting unit (now shown) may be, for example, and not limited to, a laser source that emits the incoming light beam, and the light receiving device (not shown) may be, for example, a screen, a curtain or a wall. In order to facilitate explanation, Figure 3 schematically illustrates a face L on which the light source apparatus 1 is located, and the predetermined angle between the color wheel 100 and the face L meets such a condition as greater than or equal to 0 degree and less than 90 degrees. Figure 3 shows a situation that the angle is equal to 0 degree, that is to say, the color wheel 100 being parallel to the face L. For clarity, we assume that the predetermined angle is equal to 0 degree in the following description.

[0033] As shown in Figure 3, the optical elements 1, 2 and 3 are arranged into a T-shape where the optical element 1 is perpendicular to the optical element 2 and to the optical element 3, and the optical element 4 is located between the color wheel 100 and the optical elements 1, 2 and 3, so that the horizontal incoming light beam A is reflected by the optical element 1, transmitted perpendicularly through the optical element 2 and the optical element 4, and converged onto the wavelength conversion zone 200 provided on the surface of the color wheel 100 under focusing effect of the optical element 4. Then, the portion of the incoming light beam that is not converted by the wavelength conversion zone 200, i.e., the light beam a represented by the dotted line, is transmitted through the optical element 4 and reflected by the optical element 3; and the light beam whose wavelength is converted by the wavelength conversion zone 200, i.e., the light beam b represented by the solid line, is transmitted through the optical element 4 and reflected respectively by the optical elements 2 and 3. Finally, the light beams a and b formed in such a way arrive at the light receiving device (not shown) in a direction parallel to the incoming light beam A.

[0034] It should be noted that, as shown in Figure 3, the face L is a horizontal plane, and the color wheel 100 is positioned horizontally, that is to say, the predetermined angle is 0 degrees. However, those skilled in the art shall understand, the face L is not limited to a horizontal plane, but covers any face on which the light source apparatus according to the present disclosure could be located; and the positioning of the color wheel 100 is not limited to horizontal, but may be at any degree that is greater than or equal to 0 degrees and less than 90 degrees relatively to the face L. In the interest of clarity, the face L is shown in Figure 3 only, and is omitted in the other figures. However, it shall be understood that examples in the other related figures are also drawn based on an angle of 0 degree between the color wheel 100 and the face L.

[0035] As shown in Figure 3, the center m of the optical element 4, the intersection n of the optical elements 1, 2 and 3 and the wavelength conversion zone 200 are all on the axis X. However, it shall be understood that such an arrangement is not limiting, as those skilled in the art can conceive any arrangement to implement the light path design. [0036] Herein, the optical element 1 may be, for example, a reflecting mirror, the optical element 2 may be, for example, a dichroic mirror or a color splitting/recombining prism (X-cube), the optical element 4 may be, for example, a focusing lens, and the optical element 3 may be: a reflecting mirror, so that the wavelength-converted light beam, or both the wavelength-converted light beam and a portion of the incoming light beam that is reflected by the color wheel, is transmitted through the optical element 4 and then reflected by the optical element 3 to the light receiving device; or a dichroic mirror or color splitting/recombining prism (X-cube), so that the wavelength-converted light beam is transmitted through the optical element 4 and then reflected by the optical element 3 to the light receiving device, and a portion of the incoming light beam that is reflected by the color wheel 100 is transmitted through the optical element 4 and then transmitted through the optical element 3. In other words, when the light beam a does not need to be output to the light receiving device, the optical element 3 may be a dichroic mirror or a color splitting/recombining prism so that the light beam a is transmitted through the optical element 3 (without being directed to the light receiving device) and the light beam b is reflected, in which case the optical element 2 and the optical element 3 may be integrated as one. When the light beam a needs to be output, the optical element 3 may be only a reflecting mirror, to reflect the light beams a and b to the light receiving device.

[0037] Optionally, the wavelength conversion zone 200 is arranged as a ring-shaped zone on the color wheel 100. However, the present invention is not limited to this; those skilled in the art can conceive any adequate arrangement of the wavelength conversion zone, as long as the incoming light beam arrives at the light receiving device in the way described above. [0038] It should be noted that the surfaces of the optical elements 1, 2 and 3 may be selected by those skilled in the art as needed, which are any one of flat, spherical and aspherical, or freeform, as long as the incoming light beam passes through the optical processing part provided on the color wheel and is directed to the light receiving device by means of the cooperation of those optical elements.

[0039] It is also noted that the wavelength conversion zone 200 may be made of one or more wavelength conversion materials, so that one or more wavelength-converted light beams having particular wavelengths can be generated.

[0040] In an existing light source apparatus applied to a projector, a color wheel either is arranged to be perpendicular to the face L, thereby disadvantageous^ affecting compactness of the overall size of a projector; or, as disclosed in the above Background, is arranged to incline, and the edge of the color wheel is thickened and the wavelength conversion zone is provided on the thickened edge for performing wavelength conversion of an incoming light beam, thereby the size of the color wheel being increased and related optical elements being designed with complexity, resulting in complexity of the apparatus and increased cost. However, according to the light source apparatus of embodiments of the present disclosure, by inclining, relatively to the face L, the color wheel at an angle that is greater than or equal to 0 degree and less than 90 degrees, providing the wavelength conversion zone on the surface of the color wheel, and appropriately arranging optical elements to direct the incoming light beam to the light receiving device through the color wheel, the diameter of the color wheel can be increased to stand a higher incoming laser power, without affecting the compactness and simplicity of the projector.

[0041] The structural configuration of Figure 4 is substantially the same as that of Figure 3, wherein only the light path of a portion of the incoming light beam A, which is not wavelength-converted by the color wheel 100, is shown. For explicitly illustrating the light path, as shown in the figure, the incoming light beam A is reflected by the optical element 1 , and transmitted through the optical element 2 and the optical element 4, and arrives at the color wheel 100; as it is not wavelength- converted by the wavelength conversion material on the color wheel 100 and reflected by the surface of the color wheel, a portion of the incoming light beam A, which is not wavelength-converted by the color wheel, is transmitted through the optical element 4, and reflected by the optical element 3, forming the light beam a. The output light beam a arrives finally at the light receiving device.

[0042] When the amount of the portion of the incoming light beam which is not wavelength-converted by the color wheel needs to be increased in the output light beam in order to optimize the brightness and color of the output light beam, the following three solutions may be used, for example.

[0043] First Solution

[0044] Figure 5 schematically illustrates a side view of a light source apparatus according to another embodiment of the present disclosure. As shown in Figure 5, an optical element 5 is added in comparison with the light source apparatus 1 as shown in Figure 3. The optical element 5 is configured to reflect an incoming light beam F from a second light emitting unit (not shown) that is different from the first light emitting unit directly to the light receiving device (i.e., the light beam f). The light beam/ forms, together with the above mentioned light beam a and light beam b, the output light beam that is directed to the light receiving device.

[0045] In the present embodiment, the optical element 5 may be, for example, a dichroic mirror or a color splitting/recombining prism, and the second light emitting unit may be for example a laser source. As shown in the figure, the optical element 5 is arranged at a 45 -degree angle relative to the incoming light beam F, so that the incoming light beam F from the second light emitting unit and perpendicular to the incoming light beam A is reflected by the optical element 5 and arrives at the light receiving device; and, similarly to the example as shown in Figure 3, the wavelength-converted light beam b is transmitted through the optical element 5 and arrives at the light receiving device.

[0046] Second Solution

[0047] Figure 6 schematically illustrates an example of the layout of the color wheel of the light source apparatus according to an embodiment of the present disclosure. As shown in Figure 6, the optical processing part on the surface of the color wheel 100 further includes a reflection zone 300, for reflecting a portion of the incoming light beam that is directed to the reflection zone 300. The intensity of the reflected light beam is adjustable according to a ratio between the reflection zone 300 and the wavelength conversion zone 200.

[0048] In the present embodiment, a part of the ring-shaped wavelength conversion zone 200 is replaced with the reflection zone 300. Accordingly, a portion of the incident light beam on the reflection zone 300 is directly reflected by the reflection zone, thus increasing the amount of reflected incoming light in the total output light beam, thereby obtaining a light beam output from the color wheel 100 in a time sequential manner. Therefore, the amount of the reflected incoming light beam in the total output light beam can be adjusted by adjusting the ratio between the coverage of the reflection zone 300 and the coverage of the wavelength conversion zone 200. Herein, the term "time sequential" means that only one monochromic light can be output at one and the same time. As rotation of the color wheel, a light beam illuminates respective parts of the wavelength conversion zone which correspond to lights with different wavelengths (i.e. lights in different colors), and thus is converted lights with respective wavelengths.

[0049] It should be noted that, as shown in Figure 6, the wavelength conversion zone 200 is divided into two parts, which means that the wavelength conversion zone includes two wavelength conversion materials, so that the incoming light beam is converted into two monochromic lights with difference wavelengths, and the two monochromic lights is output in a time sequential manner as rotation of the color wheel. However, it should be understood that, the wavelength conversion zone 200 is not limited to includes two wavelength conversion materials, but may includes multiple wavelength conversion materials when there need different monochromic lights to be output.

[0050] Third Solution [0051] Figure 7 schematically illustrates a side view of a light source apparatus 1 according to yet another embodiment of the present disclosure. As shown in Figure 7, the optical element 2 is configured such that a light beam E from a third light emitting unit (not shown) is directly transmitted through the optical element 2, and arrives at the light receiving device (i.e., the light beam e), wherein the third light emitting unit being different from the first light emitting unit and the second light emitting unit.

[0052] In the present embodiment, the third light emitting apparatus is, for example, a laser source. As shown in the figure, the incoming light beam E from the third light emitting unit is directly transmitted through the optical element 2 in a direction parallel to the incoming light beam A, and arrives at the light receiving device. In the following Figure 8, the grey area indicates the coverage of the wavelength-converted light beam in this case.

[0053] It should be noted that the first light emitting unit, the second light emitting unit and the third light emitting unit may either be integrated into the light source apparatus 1 , or may be implemented separately from the light source apparatus 1, as long as the light paths would not be blocked by these light emitting units.

[0054] It should also be noted that, in order to meet different requirements on optimizing the brightness and color of the output light beam in practice, the above three solutions may be used separately, or used in combination arbitrarily.

[0055] Figure 9 schematically illustrates another example of the layout of the color wheel 100 of the light source apparatus according to an embodiment of the present disclosure. Differently from Figure 6, the wavelength conversion zone 200 in Figure 9 includes only one wavelength conversion material, which means that the incoming light beam may only be converted into one monochromic light. As shown in Figure 9, the optical processing part on the surface of the color wheel also includes also a reflection zone 400, for reflecting a portion of the incoming light beam that is directed to the reflection zone 400, in which the incoming light beam is directed onto the common border between the reflection zone 400 and the wavelength conversion zone 200 to obtain a light beam output continuously from the color wheel 100. Herein, the term "continuously" means that the wavelength-converted light and unconverted light in the output light beam may be output at one and the same time.

[0056] It is known in the field of projector that a three-chip projector requires a continuous output light beam. In the prior art, this is realized by using a ultrahigh voltage mercury lamp, merged lights from multiple light sources with single or multiple wavelengths or wavelength conversion materials capable of generating multiple wavelengths simultaneously, but there exists a great difference between structural designs of the continuous light output and the time sequential light output. Therefore, the present disclosure provides a solution as shown in Figure 9. In order that the incoming light beam is directed onto the common border between the reflection zone 400 and the wavelength conversion zone 200, for example, it is possible to slightly shift the color wheel 100 in the radial direction along the axis X in Figure 3 in the light source apparatus 1 as shown in Figure 3, so that the light beam converged by the optical element 4 is directed onto the common border between the reflection zone 400 and the wavelength conversion zone 200 on the color wheel 100, as indicated by the marked light point in Figure 9, thereby the wavelength-converted light beam and the unconverted light beam can be output continuously, so that they arrive at the light receiving device simultaneously. Of course, for example, this is also achieved by changing the layout of the wavelength conversion zone and the reflection zone on the surface of the color wheel, as described in detail below.

[0057] It should be noted that the light point shown in Figure 9 is located at the common border between the outer side of the ring-shaped wavelength conversion zone 200 and the reflection zone 400; however, it shall be understood that the light point may also be located at the common border between the inner side of the ring-shaped wavelength conversion zone 200 and the reflection zone 400. Moreover, the reflection zone 400 may be either part of the surface of the color wheel 100, or the rest area of the surface of the color wheel 100 excluding the wavelength conversion zone 200. Those skilled in the art may arbitrarily configure the reflection zone 400 on the color wheel 100 as needed, so that the incoming light beam can hit the common border between the reflection zone 400 and the wavelength conversion zone 200.

[0058] Therefore, the embodiment of the present disclosure can obtain a continuous output light beam by simply changing arrangement. [0059] In embodiments of the present disclosure as described above, the light path of the incoming light beam A shown in Figure 3 includes being reflected by the optical element 1 , transmitted through the optical elements 2 and 4, reflected after wavelength-converted by the color wheel 100 or reflected directly, and reflected by the optical elements 2 and 3 (or reflected by the optical element 2 and transmitted through the optical element 3), and finally arriving at the light receiving device. Because the portion of the incoming light beam that is wavelength-converted by the color wheel 100 is reflected to all directions, the wavelength-converted light beam covers the whole grey area as shown in Figure 8 after being reflected by the optical elements 2 and 3. The incoming light beam F shown in Figure 5 directly arrives at the light receiving device after being reflected by the optical element 5 (i.e., the light beam f). The incoming light beam E shown in Figure 7 directly arrives at the light receiving device after being transmitted through the optical element 2 (i.e., the light beam e).

[0060] It should be understood that, the respective designs of light path in respective embodiments of the present disclosure are to enable the incoming light beam to arrive at the color wheel for necessary wavelength conversion processing, and direct it to the light receiving device; and if necessary (for example for meeting different requirements on brightness and color of an output light beam), different light emitting units are added and lights emitted from those light emitting units are directed to the light receiving device directly. That is to say, in embodiments of the present disclosure, the above designs of light path are accomplished by means of the light path conversion device. Thereby, in the above respective embodiments, optical elements 1 to 5 form various light path conversion device for performing light path conversion function. It should be noted that, in order to achieve the above light path conversion, those skilled in the art can easily conceive that the light path conversion device may include various other optical elements and their arrangements in combination based on the present disclosure, besides the light path conversion device formed by optical elements 1 to 5 as disclosed in the above embodiments. [0061] Take Figure 3 as an example, for example, optical element 1 could be removed, and the first light emitting unit may be arranged appropriately such that the incoming light beam A is transmitted through optical elements 2 and 4 directly, and then the light beam wavelength-converted and reflected by the color wheel is reflected by optical element 3 to the light receiving device, and the unconverted and reflected light beam may either be reflected by optical element 3 to the light receiving device, or transmitted through optical element 3 without being directed to the light receiving device, as needed. In another example, both of optical elements 1 and 2 could be removed, and the first light emitting unit may be arranged appropriately such that the incoming light beam A is transmitted through optical element 4 directly, and then the light beams wavelength-converted and/or reflected by the color wheel are reflected by optical element 3 to the light receiving device and/or transmitted through optical element 3.

[0062] As can be seen from above, by using the light source apparatus according to embodiments of the present disclosure, the substrate (for example, the color wheel) is inclined to a certain angle and optical elements are appropriately arranged to direct the incoming light beam to the light receiving device, so that the diameter of the color wheel is increased to stand a higher incoming laser power, without affecting the compactness and simplicity of the projector. In addition, when used with a laser source, the light source apparatus according to embodiments of the present disclosure realizes a time sequential light output by simply shifting the color wheel slightly in the radial direction. [0063] The light source apparatus 1 as described above may be included in a projector, as the light source required by the operation of the projector. [0064] Although the above description is illustrated in terms of a projector, however, it should be easily understood by those skilled in the art that the above described light source apparatus 1 may be used in various optical imaging and displaying devices which need to image and display using a light source system, and the above respective technical advantages could also be achieved.

[0065] Therefore, such an optical imaging and displaying device, for example a projector, shall also fall within the scope of the present disclosure.

[0066] It should be noted that the specific configurations in respective embodiments of the present disclosure may be combined arbitrarily as needed, and are not limited to the particular combination illustrated in a particular embodiment.

[0067] It shall be appreciated that in the interested of convenience of describing the principle and process of the present disclosure, the terms "transmission" and "reflection" are used in the embodiments herein to mean complete transmission and complete reflection. However it shall be understood that, in practice, there is lost in the transmission and reflection of light beams by means of related optical elements, which would not affect application of the principle and process of propagation and conversion of a light beam as described in the present disclosure.

[0068] It should be noted that all of the number-related terms used in the present disclosure, such as "first" and "second" and numerals 1, 2 and the like, do not indicate an order or importance; they are used merely to identify related elements.

[0069] The embodiments of the present disclosure are described above in conjunction with the accompanying drawings; however, it should be noted that the above description is for illustrative purposes only and shall not be interpreted as limiting the scope of the present disclosure. Those skilled in the art shall understand that, without deviation from the spirit of the present disclosure, various modifications, alternations and improvements can be made to the embodiments herein and fall within the scope of the present disclosure.

Claims

1. A light source apparatus including a substrate capable of rotating around its axe and having a surface on which a wavelength conversion zone is provided, and an light path conversion device, wherein the substrate is arranged at a predetermined angle relative to a surface on which the light source apparatus is located, and the light path conversion device is configured to direct an incoming light beam from a first light emitting unit to an optical processing part which is on the surface of the substrate and includes the wavelength conversion zone, and to direct the wavelength-converted light beam to a light receiving device.

2. The light source apparatus according to claim 1 , wherein the substrate is a color wheel.

3. The light source apparatus according to claim 1 or 2, wherein the predetermined angle is greater than or equal to 0 degree and less than 90 degrees.

4. The light source apparatus according to any of claims 1 to 3, wherein the light path conversion device is configured to reflect the wavelength-converted light beam to the light receiving device.

5. The light source apparatus according to any of claims 1 to 4, wherein the light path conversion device includes a first optical element, a second optical element, a third optical element and a fourth optical element, and wherein the first optical element, the second optical element and the third optical element are arranged into a T-shape where the first optical element is perpendicular to the second optical element and to the third optical element, and the fourth optical element is located between the substrate and the first, second and third optical elements, so that the incoming light beam is firstly reflected by the first optical element, and secondly transmitted through the second optical element and transmitted through the fourth optical element, and is directed to the optical processing part, and the wavelength-converted light beam is directed by the third optical element and the second optical element to the light receiving device.

6. The light source apparatus according to claim 5, wherein the first optical element is a reflecting mirror, the second optical element is a dichroic mirror or a color splitting/recombining prism X-cube, the fourth optical element is a lens, and the third optical element is:

- 1 / 3 - a reflecting mirror, so that the wavelength-converted light beam, or both the wavelength-converted light beam and a portion of the incoming light beam that is reflected by the substrate, is transmitted through the fourth optical element and then reflected by the third optical element to the light receiving device; or a dichroic mirror or a color splitting/recombining prism X-cube, so that the wavelength-converted light beam is transmitted through the fourth optical element and then reflected by the third optical element to the light receiving device, and a portion of the incoming light beam that is reflected by the substrate is transmitted through the fourth optical element and then transmitted through the third optical element without being directed to the light receiving device.

7. The light source apparatus according to claim 5 or 6, further comprising a fifth optical element, which is configured to reflect a light beam from a second light emitting unit that is different from the first light emitting unit directly to the light receiving device.

8. The light source apparatus according to claim 7, wherein the fifth optical element is a dichroic mirror or color splitting/recombining prism X-cube.

9. The light source apparatus according to any of claims 1 to 8, wherein the optical processing part on the surface of the substrate includes also a reflection zone, which is configured to reflect a portion of the incoming light beam that is directed to the reflection zone so as to obtain a light beam output from the substrate in a time sequential manner, wherein the intensity of the reflected light beam is adjustable according to a ratio between the reflection zone and the wavelength conversion zone.

10. The light source apparatus according to any of claims 1 to 8, wherein the optical processing part on the surface of the substrate includes also a reflection zone, which is configured to reflect a portion of the incoming light beam that is directed to the reflection zone, wherein the incoming light beam is directed to the common border between the reflection zone and the wavelength conversion zone so as to obtain a light beam output continuously from the substrate.

11. The light source apparatus according to any of claims 5 to 10, wherein the second optical element is configured such that a light beam from a third light emitting unit is directly transmitted through the second optical element, and arrives at the light receiving device, and

- 2 / 3 - wherein the third light emitting unit being different from the first light emitting unit and the second light emitting unit.

12. An optical imaging and displaying device including the light source apparatus according to any of claims 1 to 11.

13. The optical imaging and displaying device according to claim 12, wherein the optical imaging and displaying device is a projector.

- 3 / 3 -