Light source system

Abstract

This invention provides a light source system including a first light emitter, a second light emitter, and a light guide. The first light emitter emits first light with a first color band during a first time period within a time sequence. The second light emitter emits second light with a second color band during a second time period within the time sequence, and does not emit second light during the remaining time periods within the time sequence. The light guide is located downstream of the optical paths of the first and second light emitters. The first and second time periods overlap in an overlapping period, during which the first and second light emitters simultaneously emit the first and second light, thereby forming a combined light beam within the light guide, and the combined light beam is dominated by light with the second color band as its primary color tone.

Description

Technical Field

[0001] This invention relates to a light source system, and more particularly to a light source system that controls each light emitter in a timing manner. Background Technology

[0002] A light source system emits three primary colors of light: red, green, and blue (R, G, B). By adjusting the proportions and timing of these three primary colors, a variety of colorful display effects can be produced. Light source systems are also frequently used in various projection devices, such as projectors, to amplify and display the image signals provided by the image signal source on a projection screen.

[0003] To further improve the characteristics of light source systems, various fields have spared no effort in development. One of the goals currently being pursued by researchers in these fields is to provide a light source system that simultaneously achieves color gamut variation and brightness enhancement. Summary of the Invention

[0004] The purpose of this invention is to provide a light source system that achieves the effects of color gamut modification and brightness enhancement.

[0005] To achieve the above objectives, the present invention provides a light source system comprising: a first light emitter that emits first light having a first color band during a first time period within a time sequence; a second light emitter that emits second light having a second color band during a second time period within the same time sequence, and does not emit the second light during the remaining time periods within the same time sequence; and a light guide located downstream of the optical paths of the first and second light emitters; wherein the first and second time periods overlap in an overlapping period, and the first and second light emitters simultaneously emit the first and second light during the overlapping period, thereby forming a combined light beam within the light guide, and the combined light beam having the second color band as the dominant color.

[0006] Preferably, the first time period is the entire time cycle and consists of the overlapping time period and the non-overlapping time period, wherein the first light emitter emits the first light with a first light intensity during the overlapping time period and emits the first light with a second light intensity during the non-overlapping time period, and the first light intensity is lower than the second light intensity.

[0007] Preferably, the at least one combined light beam includes the second light and the first light emitted at the first light intensity, the first light intensity being lower than the light intensity of the second light.

[0008] Preferably, the first light emitter does not emit the first light during the remaining time periods of the time cycle, the first time period consisting of the overlapping time period and the non-overlapping time period, wherein the light source system further includes: a phosphor wheel, comprising: a wavelength conversion region located on the optical path of the first light emitted by the first light emitter during the overlapping time period, the first light becoming uniformly emitted after being reflected by the wavelength conversion region; and a first reflection region located on the optical path of the first light emitted by the first light emitter during the non-overlapping time period, the first light becoming first reflected light after being reflected by the first reflection region; and a color wheel, comprising: a first color filter region located on the optical path of the first reflected light to filter out the first light to the light guide; and a second color filter region located on the optical path of the second light and the luminescence to filter out the second light and a filtered light having the second color band to the light guide.

[0009] Preferably, the first reflection region is located on the rotation path of the wavelength conversion region.

[0010] Preferably, the phosphor wheel is not located in the optical path of the second light.

[0011] Preferably, the light source system further includes a light guiding module for: guiding the first light emitted during the overlapping period to the wavelength conversion region of the phosphor wheel, and guiding the luminescence to the second color filter region of the color wheel; guiding the first light emitted during the non-overlapping period to the first reflection region of the phosphor wheel, and guiding the first reflected light to the first color filter region of the color wheel; and guiding the second light to the second color filter region of the color wheel.

[0012] Preferably, the optical guiding module includes: a first beam splitter located in the optical path of the first light and the second light, allowing the second light to pass through and reflect the first light; and a second beam splitter located in the optical path of the luminescent light, the first reflected light and the second light, allowing the luminescent light, the first reflected light and the second light having a first polarization state to pass through and reflecting the second light having a second polarization state.

[0013] Preferably, the optical guiding module further includes a polarizer and a reflector, wherein the second light having the first polarization state, after passing through the second beam splitter, sequentially passes through the polarizer, is reflected by the reflector, and then passes through the polarizer to have the second polarization state.

[0014] Preferably, the fluorescent wheel further includes a second reflective area located in the optical path of the second light, and the second light becomes second reflected light after being reflected by the second reflective area.

[0015] Preferably, the first reflective region is located on the rotation path of the wavelength conversion region, and the second reflective region is not located on the rotation path of the first reflective region.

[0016] Preferably, the light source system further includes a light guiding module for: guiding the first light emitted during the overlapping period to the wavelength conversion region of the phosphor wheel, and guiding the luminescence to the second color filter region of the color wheel; guiding the first light emitted during the non-overlapping period to the first reflection region of the phosphor wheel, and guiding the first reflected light to the first color filter region of the color wheel; and guiding the second light to the second reflection region of the phosphor wheel, and guiding the second reflected light to the second color filter region of the color wheel.

[0017] Preferably, the first optical emitter and the second optical emitter are located on the same side of the optical guiding module.

[0018] Preferably, the optical guiding module includes a reflector located in the optical path of the first light and the second light, and the second light emitter emits the second light onto the reflector at an angle different from that of the first light.

[0019] Preferably, the first optical emitter and the second optical emitter are located on different sides of the optical guiding module.

[0020] Preferably, the optical guiding module includes: a first beam splitter located in the optical path of the first light and the second light, allowing the second light having a first polarization state to pass through and reflecting the first light and the first light having a second polarization state; and a second beam splitter located in the optical path of the first light and the second light, allowing the first light to pass through but reflecting the second light.

[0021] Ideally, the first light is blue light, and the second light is red or green light.

[0022] Compared with existing technologies, the light source system of the present invention allows two light emitters to simultaneously emit colored light in one or more time periods within a time cycle, thereby generating a combined light beam. This combined light beam has one of the color wavelengths as its dominant hue and has a lower color purity compared to that color light, thereby achieving the effects of color gamut change and brightness enhancement. Attached Figure Description

[0023] Figure 1A , Figure 1B and Figure 1C This is a schematic diagram of the first type of timing control for the output of each light emitter in the light source system of the present invention;

[0024] Figure 2A , Figure 2B and Figure 2C This is an architectural diagram of a light source system according to an embodiment of the present invention;

[0025] Figure 3A , Figure 3B and Figure 3C This is a schematic diagram of the second type of timing control output from each light emitter of the light source system of the present invention;

[0026] Figure 4 This is an architectural diagram of a light source system according to another embodiment of the present invention;

[0027] Figure 5A It is applied to Figure 4 A top view of the fluorescent wheel;

[0028] Figure 5B It is applied to Figure 4 A top view of the color wheel;

[0029] Figure 6 This is an architectural diagram of a light source system according to another embodiment of the present invention;

[0030] Figure 7A It is applied to Figure 6 A top view of the fluorescent wheel;

[0031] Figure 7B It is applied to Figure 6 A top view of the color wheel; and

[0032] Figure 8 This is an architectural diagram of a light source system according to another embodiment of the present invention. Detailed Implementation

[0033] To provide a further understanding of the purpose, structure, features, and functions of the present invention, detailed descriptions are provided below with reference to specific embodiments.

[0034] The light source system of the present invention emits colored light simultaneously from two light emitters during one or more time periods within a time cycle, thereby generating a combined light beam. This combined light beam has one of the color wavelengths as its dominant hue, but has a lower color purity compared to that color light, thereby achieving the effects of color gamut change and brightness enhancement.

[0035] The various embodiments of the present invention will be described in detail below, with illustrations provided. In addition to these detailed descriptions, the present invention can be widely implemented in other embodiments, and any easy substitutions, modifications, or equivalent changes to the described embodiments are included within the scope of the present invention, and are subject to the following patent claims. In the description of the specification, many specific details and implementation examples are provided to give the reader a more complete understanding of the present invention; however, these specific details and implementation examples should not be considered as limitations on the present invention. Furthermore, well-known steps or elements are not described in the details to avoid creating unnecessary limitations on the present invention.

[0036] In the following embodiments, some directional terms, such as "up," "down," "front," "back," "left," and "right," are used only for reference in the drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the invention. Furthermore, the terms "first," "second," etc., are used to identify elements and are not intended to limit those elements. Additionally, the terms "second light emitter" and "third light emitter" in the embodiments are interchangeable in terms of usage and meaning. For example, in one embodiment, when the "second light emitter" and "third light emitter" are described as a red light emitter and a green light emitter respectively, in another embodiment, the green light emitter can be described as the "second light emitter," and the red light emitter can be described as the "third light emitter." The term "light combining" in this invention refers to the ability to combine more than one light beam into a single output beam.

[0037] Figure 1A , Figure 1B and Figure 1C This is a schematic diagram of the first type of timing control for the output of each light emitter in the light source system of the present invention; Figure 2A , Figure 2B and Figure 2C This is a structural diagram of a light source system 100 according to an embodiment of the present invention. The light source system 100 can utilize... Figure 2A , Figure 2B and Figure 2C The timing control is shown.

[0038] Please refer to Figure 1A , Figure 1B , Figure 1C , Figure 2A , Figure 2B and Figure 2C The light source system 100 may include a first light emitter 110, a second light emitter 120, and a third light emitter 130, which can emit first light 110L, second light 120L, and third light 130L, respectively. Figure 1A The diagram shown is a timing control schematic of the first light 110L output by the first light transmitter 110. Figure 1B The diagram shown is a timing control schematic of the second light transmitter 120 outputting the second light 120L. Figure 1C The diagram shown is a timing control schematic of the third light 130L output by the third light transmitter 130.

[0039] In one embodiment, the first light emitter 110, the second light emitter 120, and the third light emitter 130 can be laser diode (LD) light emitters. The first light 110L output by the first light emitter 110 has a first color band, with its peak wavelength between 440nm and 480nm, i.e., the first light 110L is blue light. The second light 120LL output by the second light emitter 120 has a second color band, with its peak wavelength between 600nm and 700nm, i.e., the second light 120L is red light. The third light 130LL output by the third light emitter 130 has a third color band, with its peak wavelength between 512nm and 560nm, i.e., the third light 130L is green light.

[0040] Please refer to Figure 2A , Figure 2B and Figure 2C The light source system 100 may further include a reflector 150, a lens 160, and a light guide 140, located downstream of the optical paths of the first light emitter 110, the second light emitter 120, and the third light emitter 130. The reflector 150 is configured to reflect the first light 110L, the second light 120L, and the third light 130L emitted by the first light emitter 110, the second light emitter 120, and the third light emitter 130. The lens 160 is configured to focus or transmit the light reflected by the reflector 150 to the light guide 140. The light guide 140 is configured to receive the light passing through the lens 160 to form a combined light beam 140L within the light guide 140, and to guide the combined light beam 140L to, for example, a projection module (not shown) for use therein.

[0041] Please refer to Figure 1A , Figure 1B , Figure 1C , Figure 2A , Figure 2B and Figure 2C The first light emitter 110 emits a first light 110L during the first time period T1 within the time cycle. The second light emitter 120 emits a second light 120L during the second time period T2 within the time cycle, but does not emit light during the remaining time periods T2' within the time cycle. The third light emitter 130 emits a third light 130L during the third time period T3 within the time cycle, but does not emit light during the remaining time periods T3' within the time cycle.

[0042] like Figure 1A As shown, the first optical transmitter 110 continuously emits the first light 110L throughout the entire timing period. That is, the first time period T1 spans the entire timing period. (Comparison) Figure 1A , Figure 1B and Figure 1CThe first time period T1 can be composed of overlapping time periods OLT1, OLT2, and non-overlapping time periods NOLT. Overlapping time period OLT1 refers to the period when the first time period T1 and the second time period T2 overlap, that is, the period when the first optical transmitter 110 and the second optical transmitter 120 simultaneously emit the first light 110L and the second light 120L. Overlapping time period OLT2 refers to the period when the first time period T1 and the third time period T3 overlap, that is, the period when the first optical transmitter 110 and the third optical transmitter 130 simultaneously emit the first light 110L and the third light 130L.

[0043] like Figure 1A As shown, the first light emitter 110 emits a first light 110L with a first light intensity during the overlapping periods OLT1 and OLT2, and emits the first light 110L with a second light intensity during the non-overlapping period NOLT, with the first light intensity being lower than the second light intensity. In other words, although the first light emitter 110 continuously emits the first light 110L throughout the entire timing period, the light intensity of the first light 110L emitted during the overlapping periods OLT1 and OLT2 is less than the light intensity of the first light 110L emitted during the non-overlapping period NOLT, resulting in a variation in the light intensity of the first light 110L emitted by the first light emitter 110 throughout the entire timing period.

[0044] In addition, refer to Figure 1A , Figure 1B and Figure 1C During the overlapping periods OLT1 and OLT2, the light intensity of the first light 110L is lower than that of the second light 120L and also lower than that of the third light 130L. Specifically, as... Figure 2A As shown, the time sequence depicts the overlapping period OLT1. At this time, the combined beam 140L includes a second beam 120L and a first beam 110L, with the intensity of the first beam 110L being lower than that of the second beam 120L. Therefore, the dominant color of the combined beam 140L is based on the second color band of the second beam 120L, but mixed with some low-intensity first beam 110L, thus increasing the brightness of the combined beam 140L and achieving a color gamut change effect. Furthermore, although the combined beam 140L is dominated by the second color band of the second beam 120L, it has lower color purity. When the second light emitter 120 is a laser diode, the laser spot problem can be effectively improved. Similarly, as... Figure 2BAs shown, the time sequence depicts the overlapping period OLT2. At this time, the combined beam 140L includes a third light 130L and a first light 110L, with the intensity of the first light 110L being lower than that of the third light 130L. Therefore, the dominant color of the combined beam 140L is based on the third color band of the third light 130L, but mixed with some low-intensity first light 110L, thus increasing the brightness of the combined beam 140L and achieving a color gamut change effect. Furthermore, although the combined beam 140L is dominated by the third color band of the third light 130L, it has a lower color purity. When the third light emitter 130 is a laser diode, this effectively improves the laser beam spot problem.

[0045] Figure 3A , Figure 3B and Figure 3C This is a schematic diagram of the second type of timing control output from each light emitter of the light source system of the present invention; Figure 4 This is a structural diagram of a light source system 200 according to another embodiment of the present invention. The light source system 200 can utilize... Figure 3A , Figure 3B and Figure 3C The timing control is shown.

[0046] Please refer to Figure 4 The light source system 200 may include a first light emitter 210, a second light emitter 220, a third light emitter 230, a light guide 240, a phosphor wheel 250, a color wheel 260, and a light guiding module 270. The first light emitter 210, the second light emitter 220, the third light emitter 230, and the light guide 240 are similar to the first light emitter 110, the second light emitter 120, the third light emitter 130, and the light guide 140 described above, and will not be repeated here.

[0047] The phosphor wheel 250 is located downstream of the optical path of the first light emitter 210, but not downstream of the optical paths of the second light emitter 220 and the third light emitter 230. That is, the optical paths of the second light 220L and the third light 230L do not pass through the phosphor wheel 250. The color wheel 260 is located downstream of the optical paths of the first light emitter 210, the second light emitter 220, and the third light emitter 230. The light guiding module 270 is located between the phosphor wheel 250 and the color wheel 260, configured to guide the first light 210L through the phosphor wheel 250 to the color wheel 260, and also guides the second light 220L and the third light 230L to the color wheel 260.

[0048] In one embodiment, the light guiding module 270 may include a first beam splitter 271, a second beam splitter 272, a polarizer 273, a reflector 274, and lenses 275, 276, and 277. The first beam splitter 271 and the second beam splitter 272 may be wavelength selective, for example, a beam-splitting plate glass, a dichroic mirror (such as a half-transmitter mirror), or other optical elements that separate different wavelengths or colors, but the invention is not limited thereto. For example, the first beam splitter 271 may reflect a first light 210L. The first light 210L, after being reflected by the first beam splitter 271, passes sequentially through lenses 275 and 276 and is focused onto the phosphor wheel 250, becoming the first reflected light 210L1 (or luminescent light 210L2). The second beam splitter 272 may allow the first reflected light 210L1 (or luminescent light 210L2) to pass through, and then through lens 277 to be guided to the color wheel 260.

[0049] On the other hand, the first beam splitter 271 and the second beam splitter 272 allow the second light 220L and the third light 230L to pass through. The second light 220L and the third light 230L originally have a first polarization state. After the second light 220L and the third light 230L pass through the second beam splitter 272, they first pass through the polarizer 273 to form the second light 220L_1 and the third light 230L_1 with changed polarization direction. Then, they are reflected by the mirror 274 and pass through the polarizer 273 again to become the second light 220L_2 and the third light 230L_2 with a second polarization state. In one embodiment, polarizer 273 may be a quarter-wave plate, so the polarization state of the second light 220L_2 and the third light 230L_2 is rotated by 90° compared to the second light 220L and the third light 230L, so that the second light 220L and the third light 230L, which were originally, for example, P-waves, are transformed into S-waves. Next, the second beam splitter 272 reflects the second light 220L_2 and the third light 230L_2 with the second polarization state and guides the second light 220L_2 and the third light 230L_2 to lens 277, so that the second light 220L_2 and the third light 230L_2 pass through lens 277 and are guided to color wheel 260.

[0050] Please refer to Figure 3A , Figure 3B , Figure 3C and Figure 4 , Figure 3A The diagram shown is a timing control schematic of the first light emitter 210 outputting the first light 210L. Figure 3B The diagram shown is a timing control schematic of the second light emitter 220 outputting the second light 220L. Figure 3CThe illustration shows a timing control diagram of the third light emitter 230 outputting the third light 230L. The first light emitter 210 emits the first light 210L during the first time period T1 of the timing cycle, and does not emit light during the remaining time periods T1' of the timing cycle. The second light emitter 220 emits the second light 220L during the second time period T2 of the timing cycle, and does not emit light during the remaining time periods T2' of the timing cycle. The third light emitter 230 emits the third light 230L during the third time period T3 of the timing cycle, and does not emit light during the remaining time periods T3' of the timing cycle.

[0051] contrast Figure 3A , Figure 3B and Figure 3C The first time period T1 can be composed of overlapping time periods OLT1 and OLT2, and non-overlapping time periods NOLT. Overlapping time period OLT1 refers to the period when the first time period T1 and the second time period T2 overlap, that is, the period when the first optical transmitter 210 and the second optical transmitter 220 simultaneously emit the first light 210L and the second light 220L. Overlapping time period OLT2 refers to the period when the first time period T1 and the third time period T3 overlap, that is, the period when the first optical transmitter 210 and the third optical transmitter 230 simultaneously emit the first light 210L and the third light 230L.

[0052] Figure 5A It is applied to Figure 4 A top view of the fluorescent wheel 250. Please refer to... Figure 4 and Figure 5A The phosphor wheel 250 includes a substrate 251, wavelength conversion regions 252a and 252b, and a first reflective region 251R, and is configured to rotate about an axis A1. The wavelength conversion regions 252a and 252b and the first reflective region 251R are arranged in a ring around the axis A1 on the substrate 251, with the first reflective region 251R located between the two wavelength conversion regions 252a and 252b and on the rotation path of the wavelength conversion regions 252a and 252b. The regions of the wavelength conversion regions 252a and 252b and the first reflective region 251R span approximately π radians. In one embodiment, the wavelength conversion regions 252a and 252b can be phosphors, such as yellow phosphors. When light is focused on the wavelength conversion regions 252a and 252b, the phosphors are excited to produce luminescence of the corresponding color. When light is focused on the first reflective region 251R, the light is reflected in all directions by the first reflective region 251R to become first reflected light.

[0053] Please refer to Figure 3A , Figure 4 and Figure 5AWavelength conversion regions 252a and 252b, along with the first reflection region 251R, are located on the optical path of the first light 210L. More specifically, wavelength conversion region 252a is located on the optical path of the first light 210L emitted by the first light emitter 210 during the overlap period OLT1; the first reflection region 215R is located on the optical path of the first light 210L emitted by the first light emitter 210 during the non-overlap period NOLT; and wavelength conversion region 252b is located on the optical path of the first light 210L emitted by the first light emitter 210 during the overlap period OLT2. During the overlap periods OLT1 and OLT2, the first light 210L becomes luminescent light 210L2 after reflection by wavelength conversion regions 252a and 252b; during the non-overlap period NOLT, the first light 210L becomes the first reflected light 210L1 after reflection by the first reflection region 251R.

[0054] Correspondingly, the design and rotation of color wheel 260 also correspond to fluorescent wheel 250. Figure 5B It is applied to Figure 4 A top view of the color wheel 260. Please refer to... Figure 4 , Figure 5A and Figure 5B The color wheel 260 includes a first color filter area 261, a second color filter area 262, and a third color filter area 263, and is configured to rotate about axis A2. The first color filter area 261, for example, is a blue segment, configured to receive first reflected light 210L1 reflected by the first reflective area 251R. Further, the first color filter area 261 is located in the optical path of the first reflected light 210L1 to filter out the first light 210L (e.g., blue light) to the light guide 240. (See reference 240) Figure 3A As shown, the light that can reach the first color filter area 261 (i.e., the first reflected light 210L1) corresponds to the first light 210L emitted by the first light emitter 210 during the non-overlapping period NOLT.

[0055] Please refer to Figure 4 , Figure 5A and Figure 5B The second color filter region 262, for example, is a red segment, configured to receive the second light 220L_2 and the luminescent light 210L2 reflected by the wavelength conversion region 252a. Further, the second color filter region 262 is located in the optical path of the second light 220L_2 and the luminescent light 210L2 to filter out the second light 220L_2 (e.g., red light) and the filtered light 210L2' (e.g., red light with lower color purity) having a second color wavelength band to the light guide 240. (See reference...) Figure 3A and Figure 3BAs shown, the light reaching the second color filter region 262 (i.e., the luminescent light 210L2 and the second light 220L_2) corresponds to the first light 210L emitted by the first light emitter 210 during the overlap period OLT1 and the second light 220L emitted by the second light emitter 220 during the second period T2. It can be seen that the first light 210L and the second light 220L emitted by the first light emitter 210 and the second light emitter 220 during the overlap period OLT1 will subsequently be transformed into luminescent light 210L2 and second light 220L_2, respectively. The luminescent light 210L2 and the second light 220L_2 will pass through the second color filter region 262 at the same time and be transformed into filtered light 210L2' and second light 220L_2, respectively, thereby forming a combined light beam 240L in the light guide 240. This combined light beam 240L includes a second light 220L_2 with high color purity and a filter light 210L2' with lower color purity, thereby increasing the brightness of the combined light beam 240L and achieving a color gamut alteration effect. Furthermore, although the combined light beam 240L uses a second color band with red light as its main hue, it has lower color purity compared to native red light. Moreover, when the second light emitter 220 is a laser diode, the laser spot problem can be effectively improved.

[0056] Please refer to Figure 4 , Figure 5A and Figure 5B The third color filter region 263, for example, is a green segment, configured to receive the third light 230L_2 and the luminescent light 210L2 reflected by the wavelength conversion region 252b. Further, the third color filter region 263 is located in the optical path of the third light 230L_2 and the luminescent light 210L2 to filter out the third light 230L_2 (e.g., green light) and the filtered light 210L2' with a third color band (e.g., green light with lower color purity) to the light guide 240. (See reference...) Figure 3A and Figure 3CAs shown, the light reaching the third color filter region 263 (i.e., the luminescent light 210L2 and the third light 230L_2) corresponds to the first light 210L emitted by the first light emitter 210 during the overlap period OLT2 and the third light 230L emitted by the third light emitter 230 during the third period T3. It can be seen that the first light 210L and the third light 230L emitted by the first light emitter 210 and the third light emitter 230 during the overlap period OLT2 will subsequently be transformed into luminescent light 210L2 and third light 230L_2, respectively. Furthermore, luminescent light 210L2 and third light 230L_2 will pass through the third color filter region 263 at the same time and be transformed into filtered light 210L2' and third light 230L_2, respectively, thereby forming a combined light beam 240L in the light guide 240. This combined light beam 240L includes a third light 230L_2 with high color purity and a filter light 210L2' with lower color purity, thereby increasing the brightness of the combined light beam 240L and achieving a color gamut alteration effect. Furthermore, although the combined light beam 240L uses a third color band with green light as its main hue, it has lower color purity compared to native green light. Moreover, when the third light emitter 230 is a laser diode, it can effectively improve the laser spot problem.

[0057] Figure 6 This is a structural diagram of a light source system 300 according to another embodiment of the present invention. The light source system 300 in this embodiment can utilize... Figure 3A , Figure 3B and Figure 3C The timing control is shown.

[0058] Please refer to Figure 6 The light source system 300 may include a first light emitter 310, a second light emitter 320, a third light emitter 330, a light guide 340, a phosphor wheel 350, a color wheel 360, and a light guiding module 370. The first light emitter 310, the second light emitter 320, the third light emitter 330, and the light guide 340 are similar to the aforementioned first light emitter 110, second light emitter 120, third light emitter 130, and light guide 140, and will not be described again here. Furthermore, to clearly show the necessary details, Figure 6 The diagram only shows the second light emitter 320L emitting the second light 320L, while omitting the third light emitter 330; however, it should be understood that the third light emitter 330 can also coexist with the second light emitter 320 and have the same optical path transmission path as the second light emitter 320.

[0059] Compared to Figure 4In this embodiment, the phosphor wheel 350 is located downstream of the optical path of the first light emitter 310, as well as downstream of the optical paths of the second light emitter 320 and the third light emitter 330. That is, the optical paths of the second light 320L and the third light (not shown) also pass through the phosphor wheel 350. The color wheel 360 is located downstream of the optical paths of the first light emitter 310, the second light emitter 320, and the third light emitter 330. The light guiding module 370 is located between the phosphor wheel 350 and the color wheel 360, configured to guide the first light 310L, the second light 320L, and the third light (not shown) through the phosphor wheel 350 to the color wheel 360.

[0060] Figure 7A It is applied to Figure 6 A top view of the fluorescent wheel 350. Please refer to... Figure 6 and Figure 7A The phosphor wheel 350 includes a substrate 351, wavelength conversion regions 352a and 352b, a first reflection region 351R1, a second reflection region 351R2, and a third reflection region 351R3, and is configured to rotate about axis A1. The structure and configuration of the wavelength conversion regions 352a and 352b and the first reflection region 351R1 are similar to those of the previous generation. Figure 5A The wavelength conversion regions 252a and 252b and the first reflection region 251R1 are similar and will not be described again here. The second reflection region 351R2 and the third reflection region 351R3 are arranged in a ring around axis A1 on the substrate 351. However, the second reflection region 351R2 and the third reflection region 351R3 are located outside the wavelength conversion regions 352a and 352b and the first reflection region 351R1. Therefore, the second reflection region 351R2 and the third reflection region 351R3 are not on the rotation path of the first reflection region 351R1. When light is focused on the second reflection region 351R2 and the third reflection region 351R3, the light will be reflected in various directions through the second reflection region 351R2 and the third reflection region 351R3 to become the second reflected light and the third reflected light.

[0061] Please refer to Figure 7B It is applied to Figure 6 A 360-degree top view of the color wheel. Figure 7B The color wheel 360 shown includes a first color filter area 361, a second color filter area 362, and a third color filter area 363, which, along with... Figure 5B The structure and configuration of the color wheel 260 shown are similar, and will not be described again here.

[0062] like Figure 6As shown, in this embodiment, the first light emitter 310, the second light emitter 320, and the third light emitter 330 are located on the same side of the light guiding module 370, but the second light emitter 320 and the third light emitter 330 emit light to the light guiding module 370 at different angles. Furthermore, the light guiding module 370 can guide the first light 310L to the wavelength conversion regions 352a, 352b or the first reflection region 351R located in the inner ring of the phosphor wheel 350, guide the second light 320L to the second reflection region 351R2 located in the outer ring of the phosphor wheel 350, and guide the third light (not shown) to the third reflection region 351R3 located in the outer ring of the phosphor wheel 350.

[0063] In one embodiment, the light guiding module 370 may include a reflector 371 and lenses 372 and 373. The reflector 371 is located in the optical path of the first light 310L, the second light 320L, and the third light (not shown). The second light emitter 320 and the third light emitter 330 emit the second light 320L and the third light (not shown) to the reflector 371 at an angle different from that of the first light 310L, so that the first light 310L and the second light 320L (or the third light) are reflected by the reflector 371 and then pass through the lens 372 and focused on different areas of the phosphor wheel 350.

[0064] Please refer to Figure 3A , Figure 6 and Figure 7A During the non-overlapping period NOLT, the first light emitter 310 emits a first light 310L. The emitted first light 310L can be focused onto the first reflection area 351R1 of the phosphor wheel 350, becoming the first reflected light 310L1. The reflected first light 310L1 can sequentially pass through lenses 372 and 373 and be guided to the first color filter area 361 of the color wheel 360 to filter out the first light 310L (e.g., blue light) to the light guide 240. Therefore, the light that can reach the first color filter area 361 (i.e., the first reflected light 310L1) corresponds to the first light 310L emitted by the first light emitter 310 during the non-overlapping period NOLT.

[0065] Please refer to Figure 3A , Figure 3B , Figure 6 and Figure 7ADuring the overlapping period OLT1, the first light emitter 310 emits a first light 310L, and during the second period T2, the second light emitter 320 emits a second light 320L. The emitted first light 310L can be focused into the wavelength conversion region 352a of the phosphor wheel 350, and transformed into luminescent light 310L2; conversely, the emitted second light 320L can be focused into the second reflection region 351R2 of the phosphor wheel 350, and become second reflected light 320L1. The reflected luminescent light 310L2 and the second reflected light 320L1 can sequentially pass through lenses 372 and 373 and be guided to the second color filter region 362 of the color wheel 360, so as to filter out the filtered light 310L2' (e.g., red light with lower color purity) and the second light 320L (e.g., red light) with the second color band to the light guide 340. Therefore, the light that reaches the second color filter region 362 (i.e., the luminescent light 310L2 and the second reflected light 320L1) corresponds to the first light 310L emitted by the first light emitter 310 during the overlap period OLT1 and the second light 320L emitted by the second light emitter 320 during the second period T2. It can be seen that the first light 310L and the second light 320L emitted by the first light emitter 310 and the second light emitter 320 during the overlap period OLT1 will subsequently be transformed into luminescent light 310L2 and second reflected light 320L1, respectively. The luminescent light 310L2 and the second reflected light 320L1 will pass through the second color filter region 362 at the same time and be transformed into filtered light 310L2' and second light 320L, respectively, thereby forming a combined light beam 340L in the light guide 340. This combined light beam 340L includes a second light 320L with high color purity and a filter light 310L2' with lower color purity, thereby increasing the brightness of the combined light beam 340L and achieving a color gamut alteration effect. Furthermore, although the combined light beam 340L uses a second color band with red light as its main hue, it has lower color purity compared to the original red light. Moreover, when the second light emitter 320 is a laser diode, it can effectively improve the laser beam's spot problem.

[0066] Please refer to Figure 3A , Figure 3C , Figure 6 and Figure 7AThe first light emitter 310 emits a first light 310L during the overlapping period OLT2, and the third light emitter 330 emits a third light (not shown) during the third period T3. The emitted first light 310L can be focused into the wavelength conversion region 352b of the phosphor wheel 350 and transformed into luminescent light 310L2; conversely, the emitted third light (not shown) can be focused into the third reflection region 351R3 of the phosphor wheel 350 and become third reflected light (not shown). The reflected luminescent light 310L2 and the third reflected light (not shown) can sequentially pass through lenses 372 and 373 and be guided to the third color filter region 363 of the color wheel 360 to filter out the filtered light 310L2' with a third color band (e.g., green light with low color purity) and the third light (not shown, e.g., green light) to the light guide 340. Therefore, the light reaching the third color filter zone 363 (i.e., the luminescent light 310L2 and the third reflected light) corresponds to the first light 310L emitted by the first light emitter 310 during the overlap period OLT2 and the third light emitted by the third light emitter 330 during the third period T3. It can be seen that the first light 310L and the third light emitted by the first light emitter 310 and the third light emitter 330 during the overlap period OLT2 will subsequently transform into luminescent light 310L2 and third reflected light, respectively. Furthermore, the luminescent light 310L2 and the third reflected light will simultaneously pass through the third color filter zone 363 and transform into filtered light 310L2' and third light, respectively, thereby forming a combined light beam 340L within the light guide 340. This combined light beam 340L contains the third light with higher color purity and the filtered light 310L2' with lower color purity, thereby increasing the brightness of the combined light beam 340L and achieving a color gamut alteration effect. Furthermore, although the combined beam 340L uses a third color band with green light as its main color, it has a lower color purity compared to native green light. Moreover, when the third light emitter 330 is a laser diode, it can effectively improve the laser beam spot problem.

[0067] Please refer to Figure 8 This is a structural diagram of a light source system 400 according to another embodiment of the present invention. The light source system 400 of this embodiment is similar to... Figure 6 One difference between the light source system 300 and the light source system 300 is the arrangement of the second light emitter 420 and the third light emitter 430. The other similarities are indicated by the same symbols and will not be described in detail.

[0068] In this embodiment, the first light emitter 310 and the second light emitter 420 (or the third light emitter 430) are located on different sides of the light guiding module 470, for example, but not limited to, on opposite sides of the light guiding module 470, and light rays are incident from opposite sides of the light guiding module 470 respectively. The light guiding module 470 may include a first beam splitter 471, a second beam splitter 472, and a polarizer 473. The first beam splitter 471 and the second beam splitter 472 are located in the optical paths of the first light 310L and the second light 420L. The first beam splitter 471 allows the second light 420L with a first polarization state to pass through, but reflects the first light 310L and the second light 420L_2 with a second polarization state. The second beam splitter 472 allows the first light 310L to pass through, but reflects the second light 420L_1. The polarization direction of the second light 420L can be changed by the polarizer 473. After the second light 420L passes through the first beam splitter 471, it first penetrates the polarizer 473 to form a second light 420L_1 with a changed polarization direction. Then, it is reflected by the second beam splitter 472 and passes through the polarizer 473 again to become a second light 420L_2 with a second polarization state. In one embodiment, the polarizer 473 can be a quarter-wave plate, so the polarization state of the second light 420L_2 is rotated by 90° compared to the second light 420L, causing the original P-wave second light 420L_2 to become an S-wave second light 420L_2. Next, the first beam splitter 471 reflects the second light 420L_2 with the second polarization state and guides it to the lens 372, so that the second light 420L_2 passes through the lens 372 and is directed to the phosphor wheel 350.

[0069] Similarly, the third optical transmitter 430 can also have the same optical path as the second optical transmitter 420, which will not be described in detail here.

[0070] In summary, the light source system provided by the present invention allows two light emitters to simultaneously emit colored light during one or more time periods within a time cycle, thereby generating a combined light beam. This combined light beam has one of the color wavelengths as its dominant hue and, compared to that color light, has a lower color purity, thereby achieving the effects of color gamut alteration and brightness enhancement. Furthermore, if the light emitter is a laser diode, it can also effectively improve the laser spot problem. Additionally, in embodiments including a phosphor wheel and a color wheel, the wavelength conversion region and the corresponding color filter region can be increased or decreased according to actual design requirements to change the brightness gain effect.

[0071] The present invention has been described in the above-described embodiments; however, these embodiments are merely examples for implementing the present invention. It must be noted that the disclosed embodiments do not limit the scope of the present invention. Conversely, any modifications and refinements made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A light source system, characterized by, The light source system comprises: a first light emitter emitting first light having a first color band during a first period in a timing cycle; a second light emitter emitting second light having a second color band during a second period in the timing cycle and not emitting the second light during a remaining period in the timing cycle; and a light guide located downstream of the first light emitter and the second light emitter in a light path of the first light and the second light; wherein the first period and the second period overlap a first overlap period, the first light emitter and the second light emitter simultaneously emit the first light and the second light during the first overlap period, thereby forming a combined light beam in the light guide, and the combined light beam has the second color band as a dominant color; wherein the first period is the entire timing cycle and is composed of the first overlap period and a first non-overlap period, wherein the first light emitter emits the first light at a first light intensity during the first overlap period and emits the first light at a second light intensity during the first non-overlap period, the first light intensity being lower than the second light intensity.

2. The light source system of claim 1, wherein, The combined light beam comprises the second light and the first light emitted at the first light intensity, the first light intensity being lower than the light intensity of the second light.

3. The light source system of claim 1, wherein, The first light emitter does not emit the first light during the remaining period in the timing cycle, the first period is composed of the first overlap period and a second non-overlap period, wherein the light source system further comprises: a fluorescent wheel comprising: a wavelength conversion region located in a light path of the first light emitted by the first light emitter during the first overlap period, the first light becomes a uniform light after being reflected by the wavelength conversion region; and a first reflection region located in a light path of the first light emitted by the first light emitter during the first non-overlap period, the first light becomes first reflected light after being reflected by the first reflection region; and a color wheel comprising: a first color filter region located in a light path of the first reflected light, filtering the first light to the light guide; and a second color filter region located in a light path of the second light and the uniform light, filtering the second light and a filtered light having the second color band to the light guide.

4. The light source system of claim 3, wherein, The first reflection region is located on a rotation path of the wavelength conversion region.

5. The light source system of claim 3, wherein, The fluorescent wheel is not located in the light path of the second light.

6. The light source system of claim 5, wherein, The light guiding module further comprises: a first light guiding element guiding the first light emitted during the first overlap period to the wavelength conversion region of the fluorescent wheel and guiding the uniform light to the second color filter region of the color wheel; a second light guiding element guiding the first light emitted during the first non-overlap period to the first reflection region of the fluorescent wheel and guiding the first reflected light to the first color filter region of the color wheel; and a third light guiding element guiding the second light to the second color filter region of the color wheel.

7. The light source system as described in claim 6, characterized in that, The light guiding module comprises: a first light splitting element located in a light path of the first light and the second light, allowing the second light to penetrate and reflecting the first light; and a second light splitting element located in a light path of the uniform light, the first reflected light and the second light, allowing the uniform light, the first reflected light and the second light having a first polarization state to penetrate and reflecting the second light having a second polarization state.

8. The light source system of claim 7, wherein, The light guiding module further comprises a polarizer and a mirror, wherein the second light having the first polarization state has the second polarization state after penetrating the second light splitting element, sequentially penetrating the polarizer, being reflected by the mirror and penetrating the polarizer.

9. The light source system of claim 3, wherein, The fluorescent wheel further comprises a second reflection region located in the light path of the second light, and the second light becomes second reflected light after being reflected via the second reflection region.

10. The light source system of claim 9, wherein, The first reflection region is located in the rotation path of the wavelength conversion region, and the second reflection region is not located in the rotation path of the first reflection region.

11. The light source system of claim 10, wherein, The light guiding module is further configured to: guide the first light emitted in the overlapping period to the wavelength conversion region of the fluorescent wheel, and guide the excitation light to the second color filter region of the color wheel; guide the first light emitted in the non-overlapping period to the first reflection region of the fluorescent wheel, and guide the first reflected light to the first color filter region of the color wheel; and guide the second light to the second reflection region of the fluorescent wheel, and guide the second reflected light to the second color filter region of the color wheel.

12. The light source system of claim 11, wherein, The first light emitter and the second light emitter are located on the same side of the light guiding module.

13. The light source system as described in claim 12, characterized in that, The light guiding module comprises a mirror located in the light path of the first light and the second light, and the second light emitter emits the second light to the mirror at an angle different from the first light.

14. The light source system of claim 11, wherein, The first light emitter and the second light emitter are located on different sides of the light guiding module.

15. The light source system of claim 14, wherein the light source system is configured to provide a light source system with a color temperature of 2700 K or less. The light guiding module comprises: a first light splitting element located in the light path of the first light and the second light, allowing the second light with a first polarization state to penetrate, and reflecting the first light and the first light with a second polarization state; and a second light splitting element located in the light path of the first light and the second light, allowing the first light to penetrate, but reflecting the second light.

16. The light source system of claim 1, wherein, The first light is blue light, and the second light is red light or green light.

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