TW202401128A - Projection device and light source system thereof - Google Patents

Abstract

The present disclosure provides a projection device and light source system thereof. The light source system includes a first light source, a second light source, a curved reflecting element and a wavelength converting element. The first light source is configured to emit a first light beam. The second light source is configured to emit a second light beam. The curved reflecting element has a first focal point, a first curved surface, a second curved surface and an open slot, wherein the open slot is between the first curved surface and the second curved surface and is adjacent to the first focal point. The wavelength converting element is disposed through the open slot and has a first surface and a second surface, wherein the first light beam is configured to be incident on a first area on the first surface where the first focal point is, and the second light beam is configured to be incident on a second area on the second surface where the first focal point is.

Description

Projection device and its light source system

The present disclosure relates to a light source system, and in particular, to a light source system of a projection device.

With the development of projectors, some high-end models require the use of red lasers. Some traditional methods add the red beam emitted by the red laser into the existing optical system through a dichroic mirror. However, the above-mentioned traditional methods often cause problems such as complex optical systems and high costs.

One aspect of this disclosure is a light source system. The light source system includes a first light source, a second light source, a curved surface reflective element and a wavelength conversion element. The first light source is used to emit a first light beam. The second light source is used to emit a second light beam, wherein the first light beam has a different color or wavelength range than the second light beam. The curved reflective element has a first focus, a first curved surface, a second curved surface and a slot, wherein the first curved surface and the second curved surface are opposite to each other, and the slot is located between the first curved surface and the second curved surface. between the curved surfaces and adjacent to the first focus point. The wavelength conversion element is disposed through the slot and has a first surface and a second surface opposite each other, wherein the first light beam is used to enter a first area on the first surface where the first focus is located, And the second light beam is used to enter a second area on the second surface where the first focus is located.

Another aspect of the present disclosure is a projection device. The projection device includes a light source system, a light modulator and an imaging module. The light source system is used to generate an illumination beam and includes a first light source, a second light source and a colored light beam generating module. The first light source is used to emit a first light beam. The second light source is used to emit a second light beam, wherein the first light beam has a different color or wavelength range than the second light beam. The colored light beam generating module is located between the first light source and the second light source, and is used to receive the first light beam on a first side of an imaginary line to output the first light beam and a third light beam, and is used to A second side of the imaginary line receives the second light beam to output the second light beam, wherein an extension line of the imaginary line partially overlaps an output path of the illumination light beam, and the first side of the imaginary line is connected to the second light beam. The two sides are opposite to each other, and the third beam has a wavelength range different from that of the first beam and the second beam. The light modulator is used to convert the illumination beam into an image beam. The imaging module is used to project the image beam to generate an image frame.

In summary, the light source system of the present disclosure allows the first light beam, the second light beam and the third light beam that are different from each other to converge by diffusing the second light beam (ie, the red light beam) emitted by the second light source, thereby Produce a suitable lighting beam. Furthermore, compared with the known technology of using a splitting mirror to combine a red light beam with light beams of other colors, a projection device using the light source system of the present disclosure has the advantage of not easily generating light spots.

The following is a detailed description of the embodiments together with the accompanying drawings. However, the specific embodiments described are only used to explain the present case and are not used to limit the present case. The description of the structural operations is not intended to limit the order of execution. Any components Recombining the structure to produce a device with equal functions is within the scope of this disclosure.

As used herein, “coupling” or “connection” may refer to two or more components that are in direct physical or electrical contact with each other, or that are in indirect physical or electrical contact with each other. It may also refer to two or more components that are in direct physical or electrical contact with each other. Components interact or act with each other.

Please refer to FIG. 1 , which is a schematic diagram of a projection device 100 according to some embodiments of the present disclosure. In some embodiments, the projection device 100 includes a light source system 10 , a light modulator 20 and an imaging module 30 . As shown in FIG. 1 , the light source system 10 is used to generate an illumination beam IL. The light modulator 20 is used to convert the illumination beam IL into an image beam IM. The imaging module 30 is used to project the image beam IM to generate an image frame FR on a projection plane (such as a projection screen, wall, etc.) for the user to view. In some embodiments, the light modulator 20 can be implemented by a digital micromirror device (DMD), and the imaging module 30 can be implemented by a lens.

In some embodiments, as shown in FIG. 1 , the light source system 10 includes a first light source 11 , a second light source 12 and a colored light beam generating module. Specifically, the first light source 11 is used to emit a first light beam A, and the second light source 12 is used to emit a second light beam B. In the embodiment of FIG. 1 , the first light source 11 is implemented by a blue laser or a blue light emitting diode, and the first light beam A is a blue light beam. In addition, the second light source 12 is realized by a red laser or a red light emitting diode, and the second light beam B is a red light beam. In other words, the second light source 12 has a different color than the first light source 11 , and the first light beam A has a different color or wavelength range than the second light beam B.

In some embodiments, as shown in FIG. 1 , the colored light beam generating module is located between the first light source 11 and the second light source 12 and includes a curved surface reflective element 13 and a wavelength conversion element 14 . The curved surface reflective element 13 has a first focus F1, a second focus F2, a first curved surface 131, a second curved surface 132 and a slot 133. Specifically, the first curved surface 131 and the second curved surface 132 are opposite to each other, and the slot 133 is located between the first curved surface 131 and the second curved surface 132 and adjacent to the first focus F1. In some embodiments, both the first curved surface 131 and the second curved surface 132 are ellipsoidal surfaces.

As shown in FIG. 1 , the wavelength conversion element 14 is rotatably installed in the slot 133 and has a first surface 141 and a second surface 142 . The first surface 141 and the second surface 142 are opposite to each other. For example, the first surface 141 is the upper surface, and the second surface 142 is the lower surface. The wavelength conversion element 14 will be described in detail below with reference to Figures 2A and 2B. Please refer to Figures 2A and 2B. Figure 2A is a schematic diagram of the first surface 141 of the wavelength conversion element 14 according to some embodiments of the present disclosure. Figure 2B is a schematic diagram of the first surface 141 of the wavelength conversion element 14 according to some embodiments of the present disclosure. Schematic illustration of second surface 142 of wavelength converting element 14 .

As shown in FIG. 2A , the first surface 141 of the wavelength conversion element 14 includes a first region R1. In some embodiments, the first region R1 includes at least one light excitation region and a first light reflection region BR. For example, as shown in FIG. 2A , the first region R1 includes three photoexcitation regions GE, RE and YE (ie, at least one photoexcitation region).

Please refer to Figures 1 and 2A together. When the wavelength conversion element 14 rotates relative to the curved surface reflective element 13 in the slot 133, the first focus F1 of the curved surface reflective element 13 will fall into the light excitation area GE, light The excitation area RE, the light excitation area YE and the first light reflection area BR. In other words, the first focus F1 of the curved surface reflective element 13 is located in the first region R1 on the first surface 141 of the wavelength conversion element 14 .

As shown in FIG. 2B , the second surface 142 of the wavelength conversion element 14 includes a second region R2. In some embodiments, the second region R2 includes a second light reflection region RR.

Please refer to Figures 1 and 2B together. When the wavelength conversion element 14 rotates relative to the curved surface reflective element 13 in the slot 133, the first focus F1 of the curved surface reflective element 13 will fall into the second light reflection region RR. In other words, the first focus F1 of the curved surface reflective element 13 is located in the second region R2 on the second surface 142 of the wavelength conversion element 14 .

In some embodiments, as shown in FIG. 1 , the first light source 11 substantially emits the first light beam A toward the first focus F1 of the curved reflective element 13 and the second light source 12 substantially emits the first beam A toward the first focus F1 of the curved reflective element 13 . A focus F1 emits a second beam B. With this arrangement, the first light beam A will be incident on the first region R1 on the first surface 141 where the first focus F1 is located, and the second light beam B will be incident on the second region R2 on the second surface 142 where the first focus F1 is located.

It should be understood that when the wavelength conversion element 14 rotates relative to the curved surface reflective element 13 in the slot 133, the first light beam A may be incident on the light excitation area GE, the light excitation area RE, the light excitation area YE and the first light reflection area according to the timing sequence. One of the area BR. In some embodiments, the first light beam A is incident on the first light reflection area BR, and the first light reflection area BR is used to reflect the first light beam A to the first curved surface 131 . In some embodiments, the first light beam A is incident on one of the three light excitation regions GE, RE and YE, and each of the three light excitation regions GE, RE and YE is used to be excited by the first light beam A to generate a first light beam A. The three beams C arrive at the first curved surface 131 . In addition, when the wavelength conversion element 14 rotates relative to the curved surface reflective element 13 in the slot 133, the second light beam B will be incident on the second light reflection area RR, and the second light reflection area RR is used to reflect the second light beam B to Second surface 132.

Specifically, at least one phosphor layer may be formed on at least one photoexcitation region of the first region R1. For example, a phosphor layer for being excited by a blue beam (ie, the first beam A) to generate a green beam (ie, the third beam C) may be formed on the light excitation region GE. A phosphor layer for being excited by a blue beam (ie, the first beam A) to generate a red beam (ie, the third beam C) may be formed on the light excitation region RE. A phosphor layer for being excited by a blue beam (ie, the first beam A) to generate a yellow beam (ie, the third beam C) may be formed on the light excitation region YE.

In addition, a first light diffusion layer for reflecting the blue light beam (ie, the first light beam A) may be formed on the first light reflection region BR, and a first light diffusion layer may be formed on the second light reflection region RR for reflecting the red light beam (ie, the first light beam A). That is, a second light diffusion layer for the second light beam B). It should be understood that compared with the red light beam (ie, the second light beam B) directly generated by the second light source 12, the red light beam (ie, the third light beam C) generated due to the stimulation of the light excitation region RE has a larger wavelength. Scope.

Please refer to Figure 3 , which is a schematic diagram of some components of the light source system 10 in Figure 1 . As shown in Figure 3, an imaginary line PL passes through the first focus F1 and the second focus F2. In some embodiments, as shown in FIGS. 1 and 3 , the first light source 11 emits the first light beam A toward the first focus F1 on a first side (for example, the upper side) of the imaginary line PL, so that the first light beam A and The third light beam C is output through the curved surface reflection element 13 and the wavelength conversion element 14 . In addition, the second light source 12 emits the second light beam B toward the first focus F1 on a second side (for example, the lower side) of the imaginary line PL, so that the second light beam B is output through the curved surface reflection element 13 and the wavelength conversion element 14 .

As can be seen from the above description, the colored light beam generating module (ie, the curved surface reflective element 13 and the wavelength conversion element 14) of the projection device 100 is used to receive the first light beam A on the first side of the imaginary line PL to output the first light beam A and the second light beam A. Three beams C are used to receive the second beam B on the second side of the imaginary line PL to output the second beam B.

In some embodiments, as shown in FIG. 1 , since the first curved surface 131 and the second curved surface 132 are both ellipsoidal surfaces, the first curved surface 131 can be used to direct the first beam A and the third beam C from the first focus F1 Reflected to the second focus F2, and the second curved surface 132 can be used to reflect the second beam B from the first focus F1 to the second focus F2.

In the embodiment of FIG. 1 , the light source system 10 further includes a first lens 15 , a second lens 16 , a filter element 17 and a uniforming element 18 . As shown in FIG. 1 , the first lens 15 has a third focus F3 , wherein the third focus F3 is substantially located at the same position as the second focus F2 of the curved surface reflective element 13 . Accordingly, the first lens 15 can be used to parallelize the first beam A, the second beam B and the third beam C from the second focus F2. The second lens 16 is used to converge the parallelized first beam A, the second beam B and the third beam C. The filter element 17 is used to filter the converged first beam A, second beam B and third beam C. The homogenizing element 18 is used to homogenize the filtered first light beam A, the second light beam B and the third light beam C to generate an illumination light beam IL.

Specifically, the first lens 15 and the second lens 16 can be realized by convex lenses. The filter element 17 can be implemented by a filter wheel. The homogenizing element 18 can be implemented by a light tunnel. However, the disclosure is not limited to the above.

In the embodiment of FIG. 1 , the projection device 100 further includes a plurality of lens units L1 to L4 and an optical element O1. As shown in FIG. 1 , a plurality of lens units L1 to L4 are disposed between the uniformizing element 18 and the optical element O1 of the light source system 10 and are used to transmit the illumination beam IL to the optical element O1 . The optical element O1 is used to reflect the illumination beam IL to the light modulator 20 and to transmit the image beam IM generated by the light modulator 20 to the imaging module 30 .

It should be understood that if the imaginary line PL shown in FIG. 3 is drawn in FIG. 1 , the extension line of the imaginary line PL will partially overlap the output path of the illumination beam IL (ie, the horizontal transmission shown in FIG. 1 path).

In the aforementioned embodiment, as shown in FIG. 3 , the first light source 11 and the second light source 12 are arranged symmetrically with respect to the imaginary line PL. In addition, the first light beam A is incident on the first region R1 on the wavelength conversion element 14 at a first incident angle a1, the second light beam B is incident on the second region R2 on the wavelength conversion element 14 at a second incident angle a2, and the An incident angle a1 (for example: θ1 degrees) is the same as a second incident angle a2 (for example: θ1 degrees). However, the content of this disclosure is not limited to the above, and will be further explained below with reference to Figure 4.

Please refer to FIG. 4 , which is a schematic diagram of some components of the light source system 10 according to some embodiments of the present disclosure. In some embodiments, as shown in FIG. 4 , the first light source 11 and the second light source 12 are arranged asymmetrically with respect to the imaginary line PL, and the first incident angle a1 (for example: θ1 degrees) and the second incident angle a2 (Example: θ2 degrees) are not the same. The remaining configurations and operations of the embodiment in Figure 4 are the same or similar to the previous embodiment, and therefore will not be described again here.

In the foregoing embodiments, the light source system 10 only includes one light source (ie, the second light source 12 ) for emitting a red light beam (ie, the second light beam B), but the present disclosure is not limited thereto. The following will take the embodiment in Figure 5 as an example for description. Please refer to FIG. 5 , which is a schematic diagram of some components of the light source system 10 according to some embodiments of the present disclosure. In some embodiments, as shown in FIG. 5 , the light source system 10 further includes a third light source 19 , where the third light source 19 is used to emit a red light beam (ie, the second light beam B) to a wavelength similar to the second light source 12 . The second region R2 on the second surface 142 of the conversion element 14 is where the first focus point F1 is located. It can be seen from this that the light source system 10 may include a plurality of light sources (for example, the second light source 12 and the third light source 19 ) for emitting the second light beam B.

By drawing the imaginary line PL shown in FIG. 3 in FIG. 5 , it can be seen that the colored light beam generating module (ie, the curved surface reflection element 13 and the wavelength conversion element 14 ) of the projection device 100 is also used to generate the imaginary line PL in the imaginary line. The second side of PL receives the second light beam B emitted by the third light source 19 .

It can be known from the above embodiments of the present disclosure that the light source system 10 of the present disclosure diffuses the second light beam B (ie, the red light beam) emitted by the second light source 12 so that the first light beams A are different from each other. , the second beam B and the third beam C converge, thereby generating a suitable illumination beam IL. Furthermore, compared with the known technology of using a splitting mirror to combine red light beams with light beams of other colors, the projection device 100 using the light source system 10 of the present disclosure has the advantage of not easily generating light spots.

Although the present disclosure has been disclosed in the above embodiments, it is not intended to limit the present disclosure. Those with ordinary skill in the technical field can make various modifications and modifications without departing from the spirit and scope of the present disclosure. Therefore, this disclosure The scope of protection of the disclosed content shall be determined by the scope of the patent application attached.

10:Light source system 11:First light source 12:Second light source 13: Curved surface reflective element 14:Wavelength conversion element 15:First lens 16: Second lens 17: Filter element 18: Homogenization element 19:Third light source 20:Light modulator 30: Imaging module 100:Projection device 131: First surface 132: Second surface 133: Grooving 141: First surface 142: Second surface A:First beam B:Second beam C: The third beam F1: First focus F2: Second focus F3: The third focus L1~L4: lens unit O1: Optical components PL: imaginary line R1: first area R2: Second area GE, RE, YE: light excitation region BR: first light reflection area RR: second light reflection zone IL: illumination beam IM: image beam FR: image screen a1: first angle of incidence a2: second incident angle θ1, θ2: angle

Figure 1 is a schematic diagram of a projection device according to some embodiments of the present disclosure. FIG. 2A is a schematic diagram of a first surface of a wavelength conversion element according to some embodiments of the present disclosure. Figure 2B is a schematic diagram of a second surface of a wavelength conversion element according to some embodiments of the present disclosure. FIG. 3 is a schematic diagram of some components in a light source system according to some embodiments of the present disclosure. FIG. 4 is a schematic diagram of some components in a light source system according to some embodiments of the present disclosure. FIG. 5 is a schematic diagram of some components in a light source system according to some embodiments of the present disclosure.

Domestic storage information (please note in order of storage institution, date and number) without Overseas storage information (please note in order of storage country, institution, date, and number) without

11:First light source

12:Second light source

13: Curved surface reflective element

14:Wavelength conversion element

A:First beam

B:Second beam

F1: First focus

F2: Second focus

PL: imaginary line

a1: first angle of incidence

a2: second incident angle

θ1: angle

Claims (20)

A light source system including: a first light source for emitting a first light beam; a second light source for emitting a second light beam, wherein the first light beam has a different color or wavelength range than the second light beam; A curved reflective element has a first focus, a first curved surface, a second curved surface and a slot, wherein the first curved surface and the second curved surface are opposite to each other, and the slot is located between the first curved surface and the third curved surface. between the two curved surfaces and adjacent to the first focus; and A wavelength conversion element is inserted through the slot and has a first surface and a second surface opposite each other, wherein the first light beam is used to enter a first area on the first surface where the first focus is located. , and the second light beam is used to enter a second area on the second surface where the first focus is located. The light source system of claim 1, wherein the first area includes at least one light excitation area and a first light reflection area, and the at least one light excitation area is used to be excited by the first light beam to generate a third light beam, And the first light reflection area is used to reflect the first light beam; The second area includes a second light reflection area, and the second light reflection area is used to reflect the second light beam. The light source system of claim 2, wherein at least one phosphor layer is formed on the at least one light excitation area, a first light diffusion layer is formed on the first light reflection area, and a first light diffusion layer is formed on the second light reflection area. a second light diffusion layer. The light source system of claim 2, wherein the curved surface reflective element further has a second focus, the first curved surface is used to reflect the first light beam and the third light beam to the second focus, and the second curved surface used to reflect the second beam to the second focus. The light source system as described in claim 4, wherein the light source system also includes: A first lens has a third focus and is used to parallelize the first beam, the second beam and the third beam, wherein the third focus of the first lens and the second focus of the curved surface reflective element The focus is essentially at the same location; a second lens for converging the parallelized first beam, the second beam and the third beam; a filter element for filtering the converged first light beam, the second light beam and the third light beam; and A homogenizing element is used to homogenize the filtered first light beam, the second light beam and the third light beam to generate an illumination light beam. The light source system of claim 4, wherein the first light source and the second light source are arranged symmetrically or asymmetrically with respect to an imaginary line passing through the first focus and the second focus. The light source system of claim 1, wherein the first light beam is incident on the first area at a first incident angle, the second light beam is incident on the second area at a second incident angle, and the first incident angle is equal to The second incident angles may be the same or different. The light source system of claim 1, wherein the light source system further includes a third light source, and the third light source is used to emit the second light beam. The light source system of claim 1, wherein the first curved surface and the second curved surface are ellipsoidal surfaces. The light source system of claim 1, wherein the first light beam is a blue light beam, and the second light beam is a red light beam. A projection device containing: A light source system used to generate an illumination beam and includes: a first light source for emitting a first light beam; a second light source for emitting a second light beam, wherein the first light beam has a different color or wavelength range than the second light beam; and A colored light beam generating module, located between the first light source and the second light source, is used to receive the first light beam on a first side of an imaginary line to output the first light beam and a third light beam, and to The second light beam is received at a second side of the imaginary line to output the second light beam, wherein an extension line of the imaginary line partially overlaps an output path of the illumination light beam, and the first side of the imaginary line is connected to the second light beam. The second sides are opposite to each other, and the third beam has a wavelength range different from that of the first beam and the second beam; a light modulator for converting the illumination beam into an image beam; and An imaging module is used to project the image beam to generate an image frame. The projection device as claimed in claim 11, wherein the colored light beam generating module includes: A curved reflective element has a first focus, a second focus, a first curved surface, a second curved surface and a slot, wherein the imaginary line passes through the first focus and the second focus, and the first curved surface and The second curved surfaces are opposite each other, and the slot is located between the first curved surface and the second curved surface and adjacent to the first focus; and A wavelength conversion element is inserted through the slot and has a first surface and a second surface opposite each other, wherein the first light beam is used to enter a first area on the first surface where the first focus is located. , and the second light beam is used to enter a second area on the second surface where the first focus is located. The projection device of claim 12, wherein the first area includes at least one light excitation area and a first light reflection area, and the at least one light excitation area is used to be excited by the first light beam to generate the third light beam. The first curved surface, the first light reflection area is used to reflect the first light beam to the first curved surface, and the first curved surface is used to reflect the first light beam and the third light beam to the second focus; The second area includes a second light reflection area, the second light reflection area is used to reflect the second light beam to the second curved surface, and the second curved surface is used to reflect the second light beam to the second focus. . The projection device of claim 13, wherein at least one phosphor layer is formed on the at least one light excitation area, a first light diffusion layer is formed on the first light reflection area, and a first light diffusion layer is formed on the second light reflection area. a second light diffusion layer. The projection device as claimed in claim 13, wherein the light source system further includes: A first lens has a third focus and is used to parallelize the first light beam, the second light beam and the third light beam from the second focus, wherein the third focus of the first lens reflects with the curved surface The second focal point of the element is located substantially at the same location; a second lens for converging the parallelized first beam, the second beam and the third beam; a filter element for filtering the converged first light beam, the second light beam and the third light beam; and A homogenizing element is used to homogenize the filtered first light beam, the second light beam and the third light beam to generate the illumination light beam. The projection device of claim 12, wherein the first light source and the second light source are arranged symmetrically or asymmetrically with respect to the imaginary line. The projection device of claim 12, wherein the first light beam is incident on the first area at a first incident angle, the second light beam is incident on the second area at a second incident angle, and the first incident angle is equal to The second incident angles may be the same or different. The projection device of claim 12, wherein the first curved surface and the second curved surface are ellipsoidal surfaces. The projection device of claim 11, wherein the light source system further includes a third light source, the third light source is used to emit the second light beam, and the colored light beam generating module is used to generate the second light beam at the imaginary line. The side receives the second light beam emitted by the third light source. The projection device of claim 11, wherein the first light beam is a blue light beam, and the second light beam is a red light beam.

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