Color gamut conversion module, conversion method thereof, and projection device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CORETRONIC CORPORATION
- Filing Date
- 2021-09-06
- Publication Date
- 2026-06-16
Smart Images
Figure CN115755508B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to an optical module, an optical processing method, and an optical device, and more particularly to a color gamut conversion module, its conversion method, and a projection device. Background Technology
[0002] With the development of projection devices (projectors), projection devices that use laser light sources and light-emitting diodes (LEDs) to excite wavelength-converting materials (such as phosphors) to emit excitation light have been widely used. Taking a single light valve architecture as an example, the excitation light source is focused on a high-speed rotating wavelength-converting element (such as a phosphor wheel). After being excited or reflected by the wavelength-converting element, the emitted illumination beam is focused by a lens and then passes through a synchronously high-speed rotating filter element (such as a filtering color wheel) to achieve a time-sequential beam splitting effect.
[0003] Generally speaking, the color gamut distribution of a projection device depends on the combination of wavelength conversion elements and filter elements. Therefore, to achieve the effect of multiple color gamuts on a single projection device, additional filter elements are required.
[0004] However, adding other filter elements to the projection device not only makes the assembly more complicated and increases the manufacturing cost, but also creates space and noise problems. For example, the multiple filter elements required require a large space in the projection device, and the noise generated by multiple filter elements rotating at high speed is relatively large.
[0005] The "Background Art" paragraph is only used to help understand the content of this invention. Therefore, the content disclosed in the "Background Art" paragraph may include some prior art that is not known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the content or the problem to be solved by one or more embodiments of this invention was known or recognized by those skilled in the art before this application was filed. Summary of the Invention
[0006] This invention provides a color gamut conversion module and its conversion method, as well as a projection device with the color gamut conversion module. It can achieve color gamut switching with a simple architecture. Therefore, the manufacturing cost of the color gamut conversion module is low, the space occupied by the color gamut conversion module is small, and the color gamut conversion module does not generate excessive noise under high speed rotation.
[0007] Other objects and advantages of the present invention can be further understood from the technical features disclosed herein.
[0008] To achieve one or more of the above objectives, or other objectives, the present invention provides a color gamut conversion module, including a wavelength conversion element and a filter element. The wavelength conversion element includes at least two wavelength conversion regions. The filter element is disposed in the transmission path of an illumination beam from the wavelength conversion element. The filter element includes at least one filter region, wherein each filter region is a single-band filter region or a multi-band filter region. In the visible light transmission spectrum, the single-band filter region includes a bandpass band, while the multi-band filter region includes a plurality of first bandpass bands and a plurality of first cutoff bands, each of these first bandpass bands being located between two adjacent first cutoff bands, wherein at least one of these first bandpass bands at least partially overlaps with a bandpass band. In a first color gamut mode, the wavelength conversion element and the filter element rotate at a first relative rate. In a second color gamut mode, the wavelength conversion element and the filter element rotate at a second relative rate.
[0009] This invention proposes a conversion method for a color gamut conversion module, comprising: providing a color gamut conversion module, the color gamut conversion module including a wavelength conversion element and a filter element, the filter element including at least one filter region, wherein each filter region is a single-band filter region or a multi-band filter region, in the visible light transmission spectrum, the single-band filter region includes a bandpass band, and the multi-band filter region includes a plurality of first bandpass bands and a plurality of first cutoff bands, each of these first bandpass bands being located between two adjacent first cutoff bands, wherein at least one of these first bandpass bands at least partially overlaps with a bandpass band; and selecting a conversion of a first color gamut mode or a second color gamut mode by a processor, wherein in the first color gamut mode, the wavelength conversion element and the filter element rotate at a first relative rate, and in the second color gamut mode, the wavelength conversion element and the filter element rotate at a second relative rate.
[0010] This invention proposes a projection device including an illumination module, a light valve, and a projection lens. The illumination module includes a light source and a color gamut conversion module. The light source provides an excitation beam, and the color gamut conversion module is disposed on the transmission path of the synthesized beam. The color gamut conversion module includes a wavelength conversion element and a filter element. The wavelength conversion element includes at least two wavelength conversion regions. The filter element is disposed on the transmission path of the illumination beam from the wavelength conversion element. The filter element includes at least one filter region, wherein each filter region is a single-band filter region or a multi-band filter region. In the visible light transmission spectrum, the single-band filter region includes a bandpass band, while the multi-band filter region includes a plurality of first bandpass bands and a plurality of first cutoff bands. Each of these first bandpass bands is located between two adjacent first cutoff bands, wherein at least one of these first bandpass bands at least partially overlaps with a bandpass band. In a first color gamut mode, the wavelength conversion element and the filter element rotate at a first relative rate. In a second color gamut mode, the wavelength conversion element and the filter element rotate at a second relative rate. A light valve is positioned in the transmission path of the composite beam to convert the composite beam into an image beam. A projection lens is positioned in the transmission path of the image beam to project the image beam outside the projection device.
[0011] In the color gamut conversion module, its conversion method, and projection device of the embodiments of the present invention, the filter element employs a multi-band filter area to filter the illumination beam from the wavelength conversion element to form another color gamut. Therefore, the color gamut conversion module, its conversion method, and projection device of the embodiments of the present invention can achieve color gamut switching using a simple architecture and method, thus effectively reducing manufacturing costs and size, and the color gamut conversion module is less likely to generate excessive noise.
[0012] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the architecture of a projection device according to an embodiment of the present invention.
[0014] Figure 2A for Figure 1 The optical path diagram of the color gamut conversion module in the first color gamut mode.
[0015] Figures 2B to 2E for Figure 1 The optical path diagram of the color gamut conversion module in the second color gamut mode.
[0016] Figure 2F This is a schematic diagram of the optical path of a color gamut conversion module according to another embodiment of the present invention.
[0017] Figure 3A for Figure 2AA comparison of the transmittance spectra of the single-band filter region S1 and the multi-band filter region M.
[0018] Figure 3B for Figure 2A A comparison of the transmittance spectra of the single-band filter region S2 and the multi-band filter region M.
[0019] Figure 3C for Figure 2A A comparison of the transmittance spectra of the single-band filter region S3 and the multi-band filter region M.
[0020] Figure 3D for Figure 2A A comparison of the transmittance spectra of single-band filter regions S1, S2, and S3 with that of multi-band filter region M.
[0021] Figure 4 This is a schematic diagram of the optical path of the color gamut conversion module in the third color gamut mode in a projection device according to another embodiment of the present invention.
[0022] Figure 5 This is a schematic diagram of the optical path of the color gamut conversion module in the second color gamut mode in a projection device according to another embodiment of the present invention.
[0023] Figure 6 This is a flowchart of a color gamut conversion module conversion method according to an embodiment of the present invention. Detailed Implementation
[0024] The foregoing and other technical contents, features, and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front, or back, are merely for reference to the directions in the accompanying drawings. Therefore, the directional terms used are for illustrative purposes and not for limiting the present invention.
[0025] Figure 1 This is a schematic diagram of the architecture of a projection device according to an embodiment of the present invention. Figure 2A for Figure 1 The diagram shows the optical path of the color gamut conversion module in the first color gamut mode. Figures 2B to 2E for Figure 1 The diagram shows the optical path of the color gamut conversion module in the second color gamut mode. Please refer to... Figure 1 and Figures 2A to 2EThe projection device (projector) 10 in this embodiment includes an illumination module 12, a light valve 14, a projection lens 16, and a processor 18. The illumination module 12 includes a light source 13 and a color gamut conversion module 100a. The light source 13 provides an excitation beam L0, and the color gamut conversion module 100a is disposed on the transmission path of the excitation beam L0. In this embodiment, the light source 13 is an excitation light source, which may include a laser diode (LD) and a light-emitting diode (LED), and the excitation beam L0 emitted by the light source 13 is, for example, a blue excitation beam. However, in other embodiments, the excitation beam L0 may also be an excitation beam of other colors or an ultraviolet beam. The processor 18 is electrically connected to the light source 13, the color gamut conversion module 100a, and the light valve 14.
[0026] like Figures 2A to 2E As shown, the color gamut conversion module 100a includes a wavelength conversion element 120 and a filter element 110a. The wavelength conversion element 120 includes at least two wavelength conversion regions, but this embodiment uses three wavelength conversion regions 122, 124, and 126, and a non-wavelength conversion region 128 as an example. In this embodiment, wavelength conversion region 122 is, for example, a red phosphor region, wavelength conversion region 124 is, for example, a green phosphor region, wavelength conversion region 126 is, for example, a yellow phosphor region, and the non-wavelength conversion region 128 is, for example, a reflective or transmissive region that can reflect a blue excitation beam or allow a blue excitation beam to pass through. In this embodiment, the reflective region is, for example, a mirror, while in another embodiment, the transmissive region is, for example, any translucent plate or perforated area. In another embodiment, when the excitation beam L0 emitted by the light source 13 is ultraviolet light, the wavelength conversion element 120 includes a wavelength conversion region with blue phosphor to excite the ultraviolet light into a blue illumination beam L1. In this embodiment, the wavelength conversion regions 122, 124, 126 and the non-wavelength conversion region 128 of the wavelength conversion element 120 sequentially enter the transmission path of the blue excitation beam L0 provided by the light source 13. For example... Figure 2B As shown, when the blue excitation beam L0 from the light source 13 illuminates the wavelength conversion region 122, it excites the red phosphor to generate a red illumination beam L1, which is then transmitted to the filter element 110a. Figure 2C As shown, when the blue excitation beam L0 from the light source 13 illuminates the wavelength conversion region 124, it excites the green phosphor to generate a green illumination beam L1, which is then transmitted to the filter element 110a. Figure 2D As shown, when the blue excitation beam L0 from the light source 13 illuminates the wavelength conversion region 126, it excites the yellow phosphor to generate a yellow illumination beam L1, which is then transmitted to the filter element 110a. Figure 2AAs shown, when the blue excitation beam L0 from the light source 13 illuminates the non-wavelength conversion region 128, the excitation beam L0 will be reflected by the non-wavelength conversion region 128 (reflection region), or the excitation beam L0 will penetrate the non-wavelength conversion region 128 (transmission region), and the blue illumination beam L1 will then be transmitted to the filter element 110a.
[0027] Figure 3A for Figure 2A A comparison of the transmittance spectra of the single-band filter region S1 and the multi-band filter region M. Figure 3B for Figure 2A A comparison of the transmittance spectra of the single-band filter region S2 and the multi-band filter region M. Figure 3C for Figure 2A A comparison of the transmittance spectra of the single-band filter region S3 and the multi-band filter region M. Figure 3D for Figure 2A A comparison of the transmittance spectra of single-band filter regions S1, S2, and S3 with that of multi-band filter region M. Please refer to... Figures 2A to 2E and Figures 3A to 3D The filter element 110a includes single-band filter regions S1, S2, and S3, and a multi-band filter region M. The visible light transmission spectrum is defined as the portion of the electromagnetic spectrum that can be seen or perceived by the human eye, such as electromagnetic waves with wavelengths ranging from 360 nm to 830 nm. In the visible light transmission spectrum, the single-band filter regions S1, S2, and S3 respectively include bandpass bands BR, BG, and BY. For example, single-band filter region S1 may have a bandpass band BR that allows red light to pass through but blocks other colors of light; single-band filter region S2 may have a bandpass band BG that allows green light to pass through but blocks other colors of light; and single-band filter region S3 may have a bandpass band BY that allows red, yellow, and green light (red and green light mixed together produce yellow light) to pass through but blocks other colors of light.
[0028] The multi-band filter region M includes multiple first bandpass bands B and multiple first cutoff bands C. For example... Figures 3A to 3D As shown, the first bandpass band B is defined as the band through which the illumination beam L1 can penetrate the filter element 110a, i.e., the band with a transmittance of not 0%. The first cutoff band C is defined as the band through which the illumination beam L1 penetrates the filter element 110a with a transmittance of 0%. Each of these first bandpass bands B is located between two adjacent first cutoff bands C, wherein at least one of these first bandpass bands B at least partially overlaps with bandpass bands BR, BG, and BY. These first bandpass bands B and these first cutoff bands C combine to form the multiple bandpass bands BM of the multi-band filter region M.
[0029] Please refer to Figure 2AIn the first color gamut mode P1, the wavelength conversion element 120 and the filter element 110a rotate at a first relative rate, where the first relative rate is, for example, 0, that is, the wavelength conversion element 120 and the filter element 110a rotate synchronously. Single-band filter regions S1, S2, and S3, and multi-band filter region M are sequentially inserted into the transmission path of the illumination beam L1. Specifically, when the wavelength conversion region 122 is inserted into the transmission path of the blue excitation beam L0 from the light source 13, the blue excitation beam L0 excites the red phosphor in the wavelength conversion region 122, generating a red illumination beam L1. At this time, the single-band filter region S1 is inserted into the transmission path of the red illumination beam L1 to filter the red illumination beam L1 into a purer red composite beam L1', which is then transmitted to the light valve 14 (shown in...). Figure 1 When wavelength conversion region 124 enters the transmission path of the blue excitation beam L0 from light source 13, the blue excitation beam L0 excites the green phosphor in wavelength conversion region 124 to generate a green illumination beam L1. At this time, single-band filter region S2 enters the transmission path of the green illumination beam L1 to filter the green illumination beam L1 into a purer green composite beam L1', which is then transmitted to light valve 14. When wavelength conversion region 126 enters the transmission path of the blue excitation beam L0 from light source 13, the blue excitation beam L0 excites the yellow phosphor in wavelength conversion region 126 to generate a yellow illumination beam L1. At this time, single-band filter region S3 enters the transmission path of the yellow illumination beam L1 to filter the yellow illumination beam L1 into a purer yellow composite beam L1', which is then transmitted to light valve 14.
[0030] In other words, in this embodiment, the wavelength conversion element 120 is, for example, a phosphor wheel, which rotates to allow the wavelength conversion regions 122, 124, 126 and the non-wavelength conversion region 128 to sequentially enter the transmission path of the excitation beam L0. Furthermore, the filter element 110a is, for example, a filtering color wheel, which rotates to allow the single-band filter regions S1, S2, and S3 and the multi-band filter region M to sequentially enter the transmission path of the illumination beam L1.
[0031] When the non-wavelength conversion region 128 enters the transmission path of the blue excitation beam L0 from the light source 13, the blue excitation beam L0 penetrates the non-wavelength conversion region 128 to the multi-band filter region M, or the blue excitation beam L0 is reflected by the non-wavelength conversion region 128 and reflected by a multi-faceted mirror (not shown) to the multi-band filter region M. One of the first bandpass bands B of the multi-band filter region M is a bandpass band that allows blue light to pass through, so the blue illumination beam L1 penetrates the multi-band filter region M and is transmitted to the light valve 14.
[0032] Please refer to Figure 1 A light valve 14 is positioned along the transmission path of the composite beam L1' to convert it into an image beam L2. A projection lens 16 is positioned along the transmission path of the image beam L2 to project the image beam L2 onto a target outside the projection device 10, such as a screen or wall surface. In this embodiment, the light valve 14 is, for example, a digital micromirror device (DMD), a liquid crystal on silicon (LCOS) panel, a transmissive liquid crystal panel, or another spatial light modulator (SLM). The light valve 14 sequentially converts the composite beam L1' (which appears red, green, yellow, and blue in the first color gamut mode P1) into the image beam L2, enabling the projection lens 16 to project a color image onto the target in a time-multiplexed manner. The projection lens 16 may include, for example, a combination of one or more optical lenses with refractive power, such as various combinations of non-planar lenses including biconcave lenses, biconvex lenses, concave-convex lenses, convex-concave lenses, plano-convex lenses, and plano-concave lenses. In one embodiment, the projection lens 16 may also include planar optical lenses. The present invention does not limit the type or form of the projection lens 16.
[0033] Please refer to Figures 2B to 2E In the second color gamut mode P2, the wavelength conversion element 120 and the filter element 110a rotate at a second relative rate, and the multi-band filter region M is on the transmission path of the illumination beam L1. In this embodiment, the rotation of the wavelength conversion element 120 and the filter element 110a at the second relative rate in the second color gamut mode P2 includes the filter element 110a being stationary while the wavelength conversion element 120 rotates relative to the filter element 110a, or in other embodiments, the wavelength conversion element 120 and the filter element 110a rotate asynchronously.
[0034] Specifically, in this embodiment, the filter element 110a remains stationary, keeping the multi-band filter region M on the transmission path of the illumination beam L1, while the wavelength conversion element 120 rotates continuously, causing the wavelength conversion regions 122, 124, 126 and the non-wavelength conversion region 128 to sequentially enter the transmission path of the excitation beam L0, thereby sequentially forming red, green, yellow, and blue illumination beams L1 that are transmitted to the filter element 110a. Please refer to... Figures 3A to 3D Any of the multiple bandpass bands BM, one of the first bandpass bands B of the multi-band filter region M is a bandpass band that allows red light to pass through, which can filter the red illumination beam L1 into a purer red composite beam L1' and transmit it to the light valve 14 (shown in Figure 1 One of the first bandpass bands B of the multi-band filter region M is a bandpass band that allows green light to pass through, which filters the green illumination beam L1 into a purer green composite beam L1' and transmits it to the light valve 14. Another of the first bandpass bands B of the multi-band filter region M is a bandpass band that allows red light to pass through and a bandpass band that allows green light to pass through, which filters the yellow illumination beam L1 into a purer red and green (which together equals yellow) composite beam L1' and transmits it to the light valve 14. Yet another of the first bandpass bands B of the multi-band filter region M is a bandpass band that allows blue light to pass through, which allows the blue illumination beam L1 to pass through and transmits the blue composite beam L1' to the light valve 14. In this way, under the second color gamut mode P2, as the wavelength conversion element 120 rotates continuously, the wavelength conversion regions 122, 124, 126 and the non-wavelength conversion region 128 sequentially enter the transmission path of the excitation beam L0. The light valve 14 can sequentially receive the composite beam L1' which is red, green, yellow and blue under the second color gamut mode P2, and sequentially convert the composite beam L1' into the image beam L2, thereby forming a color image on the projection target.
[0035] In other words, the illumination beam L1 includes a first color light at a first time point (e.g., the aforementioned red illumination beam L1) and a second color light at a second time point (e.g., the aforementioned blue illumination beam L1). In the first color gamut mode P1, the first color light is incident on the single-band filter area S1, while the second color light is incident on the multi-band filter area M. In the second color gamut mode P2, both the first and second color lights are incident on the multi-band filter area M. In this embodiment, the illumination beam L1 also includes a third color light at a third time point (e.g., the aforementioned green illumination beam L1) and a fourth color light at a fourth time point (e.g., the aforementioned yellow illumination beam L1). In the first color gamut mode P1, the third and fourth color lights are incident on the single-band filter areas S2 and S3, respectively, while in the second color gamut mode P2, both the third and fourth color lights are incident on the multi-band filter area M.
[0036] This invention does not limit the types of light colors to the four mentioned above, that is, it does not limit the total number of wavelength conversion regions and non-wavelength conversion regions to four, nor does it limit the number of single-band filter regions to three. In other embodiments, the light colors can be three colors: red, green, and blue (i.e., the total number of wavelength conversion regions and non-wavelength conversion regions is three, which respectively form red, green, and blue illumination beams L1). Alternatively, in other embodiments, the light colors can be two colors, such as yellow and blue, or other colors of various kinds and numbers; this invention is not limited to these.
[0037] Furthermore, in this embodiment, the total number of regions of the single-band filter regions S1, S2, S3 and the multi-band filter region M of the filter element 110a (in Figure 2A For example, 4) equals the number of regions of at least two wavelength conversion regions 122, 124, 126 and the non-wavelength conversion region 128 of the wavelength conversion element 120 (in Figure 2A For example, 4). In other embodiments, for example, when the light color is red, green, and blue, the filter element 110a may have two single-band filter areas S1 and S2 for red and green respectively, and one multi-band filter area M, while the wavelength conversion element 120 may have wavelength conversion areas 122 and 124 and a non-wavelength conversion area 128 that sequentially form red, green, and blue illumination beams L respectively. In this case, the total number of regions of the two single-band filter areas S1 and S2 and the one multi-band filter area M of the filter element 110a is 3, and the total number of regions of the three wavelength conversion areas 122 and 124 and the non-wavelength conversion area 128 of the wavelength conversion element 120 is also 3.
[0038] In this embodiment, the multi-band filtering region M of the filter element 110a has a frosted surface, which can be used to suppress the laser speckle phenomenon generated on the projected target by the blue illumination beam L1 (i.e., the excitation beam) due to its high coherence. In another embodiment, such as Figure 2F As illustrated, the color gamut conversion module 100a' also includes a light diffusion element 130, disposed on the transmission path of the synthesized beam L1', wherein the filter element 110a is located between the wavelength conversion element 120 and the light diffusion element 130. The light diffusion element 130, like the aforementioned frosted surface, can effectively suppress laser speckle.
[0039] In this embodiment, the ranges of the first bandpass bands B of the multi-band filter area M are different from those of the bandpass bands BR, BG and BY of the single-band filter areas S1, S2 and S3. Therefore, the filtered bands are different. Thus, when the color gamut conversion module 100a switches between the first color gamut mode P1 and the second color gamut mode P2, the color gamut that the color image on the projected target can display is also different, thereby achieving the effect of color gamut switching.
[0040] In the color gamut conversion module 100a and projection device 10 of this embodiment, the filter element 110a, in addition to employing single-band filter areas S1, S2, and S3, also employs a multi-band filter area M to filter the illumination beam L1 from the wavelength conversion element 120, thereby forming another color gamut. Therefore, the color gamut conversion module 100a and projection device 10 of this embodiment can achieve color gamut switching using a simple architecture without the need for additional filter elements, thus effectively reducing the manufacturing cost and space occupied by the color gamut conversion module. Furthermore, since color gamut switching can be achieved without additional filter elements, the number of wavelength conversion elements and filter elements used in the color gamut conversion module 100a and projection device 10 of this embodiment can be reduced, resulting in less noise.
[0041] Figure 4 This is a schematic diagram of the optical path of the color gamut conversion module in the third color gamut mode in a projection device according to another embodiment of the present invention. Please refer to... Figure 4 , Figure 1 The color gamut conversion module 100a in the projection device 10 can also be replaced by the color gamut conversion module 100b of this embodiment to form another projection device. The color gamut conversion module 100b of this embodiment and... Figures 2A to 2E Similar to the color gamut conversion module 100a, the differences are as follows. In the color gamut conversion module 100b of this embodiment, the filter element 110b further includes a second multi-band filter region M2. In the visible light transmission spectrum, the second multi-band filter region M2 includes a plurality of second bandpass bands and a plurality of second cutoff bands. Each of these second bandpass bands is located between two adjacent second cutoff bands, and these second bandpass bands are different from the first bandpass bands B of the multi-band filter region M.
[0042] In the first color gamut mode, the wavelength conversion element 120 and the filter element 100b rotate at a first relative rate, for example, synchronously. When the wavelength conversion region 124 (which may contain green phosphor) enters the transmission path of the excitation beam L0, the excitation beam L0 excites the green phosphor to form a green illumination beam L1. At this time, the second multi-band filter region M2 enters the transmission path of the green illumination beam L1. One of the second bandpass bands of the second multi-band filter region M2 is a bandpass band that allows green light to pass through. That is, the second multi-band filter region M2 replaces... Figure 2A The single-band filter area S2.
[0043] In the second color gamut mode, wavelength conversion regions 122, 124, 126 and non-wavelength conversion region 128 sequentially enter the transmission path of the excitation beam L0, while the multi-band filter region M remains continuously in the transmission path of the illumination beam L1. This situation is similar to... Figures 2B to 2E The situation is the same, so it will not be repeated here.
[0044] In the third color gamut mode P3, such as Figure 4 As illustrated, the wavelength conversion element 120 and the filter element 110b rotate at a third relative rate, and the second multi-band filter region M2 is on the transmission path of the illumination beam L1. For example, the wavelength conversion element 120 can rotate continuously while the filter element 110b remains stationary, thus keeping the second multi-band filter region M2 on the transmission path of the illumination beam L1. The second bandpass band of the second multi-band filter region M2 may include a red bandpass band, a green bandpass band, and a blue bandpass band, similar to the multi-band filter region M. However, the range of each bandpass band in the second multi-band filter region M2 differs from that in the multi-band filter region M. Therefore, three different color gamuts can be generated in the first color gamut mode, the second color gamut mode, and the third color gamut mode.
[0045] According to another embodiment of the present invention, in addition to the three different color gamuts described above, the filter element 110b in the color gamut conversion module 100b of this embodiment may further include a third multi-band filter region and / or a fourth multi-band filter region (not shown in the figures). In the visible light transmission spectrum, the third / fourth multi-band filter region includes a plurality of third / fourth bandpass bands and a plurality of third / fourth cutoff bands. Each of these third / fourth bandpass bands is located between two adjacent third / fourth cutoff bands, and these third / fourth bandpass bands are different from the first bandpass bands B and the second bandpass bands of the multi-band filter region M. In the fourth color gamut mode, the wavelength conversion element 120 and the filter element 110b rotate at a fourth relative rate, and the third multi-band filter region is on the transmission path of the illumination beam L1. In the fifth color gamut mode, the wavelength conversion element 120 and the filter element 110b rotate at a fifth relative rate, and the fourth multi-band filter region is on the transmission path of the illumination beam L1. Therefore, the color gamut conversion module in this embodiment can generate five different color gamuts. However, the number of color gamut modes provided by this invention is not limited to this.
[0046] Figure 5 This is a schematic diagram of the optical path of the color gamut conversion module in the projection device according to another embodiment of the present invention in the second color gamut mode. Please refer to... Figure 5 The color gamut conversion module 100c in this embodiment is similar to Figure 4The color gamut conversion module 100b differs from the other two as described below. In the color gamut conversion module 100c of this embodiment, the filter element 110c does not have the following characteristics: Figure 4 Instead of single-band filter areas S1 and S3, it has a multi-band filter area M and a second multi-band filter area M2. In the first color gamut mode, the wavelength conversion element 120 and the filter element 110c rotate at a first relative rate, and the multi-band filter area M is on the transmission path of the illumination beam L1. In the second color gamut mode P2, as... Figure 5 As shown, the wavelength conversion element 120 and the filter element rotate at a second relative rate, and the second multi-band filter area M2 is on the transmission path of the illumination beam L1.
[0047] In this embodiment, the wavelength conversion element 120 and the filter element 110c rotate at a first relative rate and a second relative rate, including the filter element 110c being stationary while the wavelength conversion element 120 rotates relative to the filter element 110c. Alternatively, in another embodiment, the wavelength conversion element 120 and the filter element 110c may rotate asynchronously.
[0048] Specifically, in the first color gamut mode, wavelength conversion regions 122, 124, 126 and non-wavelength conversion region 128 sequentially enter the transmission path of the excitation beam L0 to sequentially form illumination beams L1 that are red, green, yellow, and blue. At this time, the filter element 110c remains stationary, while the multi-band filter region M remains on the transmission path of the illumination beam L1 to sequentially filter the composite beam L1' that is red, green, yellow, and blue.
[0049] In the second color gamut mode, wavelength conversion regions 122, 124, 126 and non-wavelength conversion region 128 sequentially enter the transmission path of the excitation beam L0 to sequentially form illumination beams L1 that are red, green, yellow, and blue. At this time, filter element 110c remains stationary, while the second multi-band filter region M2 remains on the transmission path of the illumination beam L1 to sequentially filter the composite beam L1' that is red, green, yellow, and blue.
[0050] In other words, the illumination beam L1 includes a first color light at a first time point (such as the red illumination beam L1 described above) and a second color light at a second time point (such as the green illumination beam L1 described above). In the first color gamut mode, both the first and second color lights are incident on the multi-band filter region M. In the second color gamut mode, both the first and second color lights are incident on the second multi-band filter region M2. In this embodiment, the illumination beam L1 also includes a third color light at a third time point (such as the yellow illumination beam L1 described above) and a fourth color light at a fourth time point (such as the blue illumination beam L1 described above). In the first color gamut mode, both the third and fourth color lights are incident on the multi-band filter region M. In the second color gamut mode, both the third and fourth color lights are incident on the second multi-band filter region M2. As described above. Figures 2A to 2E In this embodiment, the number of colored light types is not limited. In other embodiments, three colored lights, two colored lights, or other different numbers of colored lights may be used.
[0051] In this embodiment, the total number of regions of the multi-band filtering region M of the filter element 110c and the second multi-band filtering region M2 (in Figure 5 For example, 2) is the number of regions less than or equal to at least two wavelength conversion regions 122, 124, 126 and non-wavelength conversion region 128 of wavelength conversion element 120 (in Figure 5 For example, 4). However, in other embodiments, the filter element 110c may also have other numbers of multi-band filter regions (e.g., 4 multi-band filter regions), and if the number of wavelength conversion regions 122, 124, 126 and non-wavelength conversion region 128 is 4, then the sum of the number of regions of the multi-band filter regions is equal to the number of regions of the wavelength conversion regions.
[0052] In this embodiment, the multi-band filtering region M of the filter element 110c may have a first atomized surface, while the second multi-band filtering region M2 may have a second atomized surface, which can suppress laser speckle as described in the above embodiments. However, in other embodiments, the color gamut conversion module 100c may further include, as in... Figure 2F The illustrated light diffusion element 130 is disposed on the transmission path of the composite beam L1', wherein the filter element 110c is located between the wavelength conversion element 120 and the light diffusion element 130, and the light diffusion element 130 can be used to suppress laser speckle.
[0053] Figure 6 This is a flowchart illustrating a color gamut conversion method according to an embodiment of the present invention. Please refer to... Figures 2A to 2E and Figure 6 The color gamut conversion method of this embodiment can be implemented using the color gamut conversion modules of the above embodiments. The following will use... Figures 2A to 2EThe color gamut conversion module 100a will be used as an example for explanation. The conversion method of the color gamut conversion module includes the following steps. First, step T110 is executed, providing the color gamut conversion module 100a, wherein the detailed structure and optical path of the color gamut conversion module 100a are as follows: Figures 2A to 2E The embodiments have been described in detail and will not be repeated here. Next, step T120 is executed. When the user requests to change the projection scene, the image color needs to be adjusted. At this time, the processor 18 of the projection device 10 executes the selection of color gamut mode, controlling the color gamut conversion module 100a to convert to the first color gamut mode P1 or the second color gamut mode P2. The detailed process and method of converting to the first color gamut mode P1 or the second color gamut mode P2 have been described in detail. Figures 2A to 2E The embodiments are described in detail and will not be repeated here.
[0054] The color gamut conversion method of this embodiment can also be applied to... Figure 5 The embodiments, and when applied to Figure 4 In the embodiment, step T120 is changed to the processor 18 of the projection device 10 selecting the color gamut mode, controlling the color gamut conversion module 100a to convert to the first color gamut mode, the second color gamut mode, or the third color gamut mode P3 (e.g., ...). Figure 4 shown).
[0055] The color gamut conversion module in this embodiment can achieve color gamut switching in a simple way, thus effectively reducing the manufacturing cost and size of the color gamut conversion module, and the color gamut conversion module will not generate excessive noise.
[0056] In summary, in the color gamut conversion module, its conversion method, and projection device of the embodiments of the present invention, the filter element employs a multi-band filter area to filter the illumination beam from the wavelength conversion element to form another color gamut. Therefore, the color gamut conversion module, its conversion method, and projection device of the embodiments of the present invention can achieve color gamut switching using a simple architecture and method, without the need for additional filter elements, thus effectively reducing the manufacturing cost and size of the color gamut conversion module. Furthermore, since color gamut switching can be achieved without additional filter elements, the number of rotating wheels in the color gamut conversion module, its conversion method, and projection device of the embodiments of the present invention can be reduced, resulting in less noise generated by the color gamut conversion module, its conversion method, and projection device.
[0057] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All simple equivalent variations and modifications made according to the claims and description of the invention are still within the scope of this invention. Furthermore, no embodiment or claim of the present invention needs to achieve all the objectives, advantages, or features disclosed in the invention. In addition, the abstract and headings are merely for assisting in patent document searches and are not intended to limit the scope of the invention. Moreover, the terms "first," "second," etc., used in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and are not intended to limit the upper or lower limit of the number of elements.
[0058] Explanation of reference numerals in the attached figures
[0059] 10: Projection device
[0060] 12: Lighting Module
[0061] 13: Light source
[0062] 14: Light valve
[0063] 16: Projection lens
[0064] 18: Processor
[0065] 100a, 100a', 100b, 100c: Color gamut conversion module
[0066] 110a, 110b, 110c: Filter elements
[0067] 120: Wavelength conversion element
[0068] 122, 124, 126: Wavelength conversion region
[0069] 128: Non-wavelength conversion region
[0070] 130: Light diffusion element
[0071] B: First bandpass
[0072] BG, BR, BY: Bandpass band
[0073] BM: Multiple bandpass bands
[0074] C: First cutoff band
[0075] L0: Excitation beam
[0076] L1: illumination beam
[0077] L1': Composite beam
[0078] L2: Image Beam
[0079] M: Multi-band filter area
[0080] M2: Second multi-band filter area
[0081] P1: First color gamut mode
[0082] P2: Second color gamut mode
[0083] P3: Third Color Gamut Mode
[0084] S1, S2, S3: Single-band filter area
[0085] T110, T120: Steps.
Claims
1. A color gamut conversion module, characterized in that, The color gamut conversion module includes a wavelength conversion element and a filter element, wherein: The wavelength conversion element includes at least two wavelength conversion regions; and The filter element is disposed on the transmission path of the illumination beam from the wavelength conversion element. The filter element includes a plurality of filter regions, one of which is a first multi-band filter region. The remaining filter regions include at least one single-band filter region and / or one second multi-band filter region. In the visible light transmission spectrum, the at least one single-band filter region includes a single bandpass band, while the first multi-band filter region includes a plurality of first bandpass bands and a plurality of first cutoff bands. Each of the plurality of first bandpass bands is located between two adjacent first cutoff bands. At least one of the plurality of first bandpass bands at least partially overlaps with the bandpass band. In the first color gamut mode, the wavelength conversion element and the filter element rotate at a first relative rate. In the second color gamut mode, the wavelength conversion element and the filter element rotate at a second relative rate, and the first multi-band filter area or the second multi-band filter area is on the transmission path of the illumination beam.
2. The color gamut conversion module according to claim 1, characterized in that, The wavelength conversion element and the filter element rotate at a first relative rate and a second relative rate, including the filter element being stationary while the wavelength conversion element rotates relative to the filter element, or the wavelength conversion element and the filter element rotating synchronously or asynchronously.
3. The color gamut conversion module according to claim 1, characterized in that, In the first color gamut mode, the at least one single-band filter area and the first multi-band filter area are sequentially inserted into the transmission path of the illumination beam. In the second color gamut mode, the first multi-band filter area is in the transmission path of the illumination beam.
4. The color gamut conversion module according to claim 1, characterized in that, In the visible light transmission spectrum, the second multi-band filtering region includes a plurality of second bandpass bands and a plurality of second cutoff bands. Each of the plurality of second bandpass bands is located between two adjacent second cutoff bands in the plurality of second cutoff bands, and the plurality of second bandpass bands are different from the plurality of first bandpass bands.
5. The color gamut conversion module according to claim 4, characterized in that, In the first color gamut mode, the at least one single-band filter area, the first multi-band filter area, and the second multi-band filter area are sequentially inserted into the transmission path of the illumination beam. In the second color gamut mode, the first multi-band filter area is on the transmission path of the illumination beam. In the third color gamut mode, the wavelength conversion element and the filter element rotate at a third relative speed, and the second multi-band filter area is on the transmission path of the illumination beam.
6. The color gamut conversion module according to claim 4, characterized in that, In the first color gamut mode, the first multi-band filter area is on the transmission path of the illumination beam; in the second color gamut mode, the second multi-band filter area is on the transmission path of the illumination beam.
7. The color gamut conversion module according to claim 1, characterized in that, The first multi-band filtering region of the filter element has a fogging surface.
8. The color gamut conversion module according to claim 1, characterized in that, The color gamut conversion module also includes: A light diffusion element is disposed in the transmission path of a composite beam from the filter element, wherein the filter element is located between the wavelength conversion element and the light diffusion element.
9. The color gamut conversion module according to claim 1, characterized in that, The sum of the number of regions of the plurality of filter regions of the filter element is less than or equal to the number of regions of the at least two wavelength conversion regions and the non-wavelength conversion regions of the wavelength conversion element.
10. A conversion method for a color gamut conversion module, characterized in that, The method includes: A color gamut conversion module is provided, comprising a wavelength conversion element and a filter element. The filter element is disposed on the transmission path of an illumination beam from the wavelength conversion element. The filter element includes a plurality of filter regions, wherein one of the plurality of filter regions is a first multi-band filter region, and the remaining filter regions of the plurality of filter regions include at least one single-band filter region and / or one second multi-band filter region. In the visible light transmission spectrum, the at least one single-band filter region includes a single bandpass band, and the first multi-band filter region includes a plurality of first bandpass bands and a plurality of first cutoff bands. Each of the plurality of first bandpass bands is located between two adjacent first cutoff bands, wherein at least one of the plurality of first bandpass bands at least partially overlaps with the bandpass band. The processor selects to switch between a first color gamut mode and a second color gamut mode. In the first color gamut mode, the wavelength conversion element and the filter element rotate at a first relative rate, while in the second color gamut mode, the wavelength conversion element and the filter element rotate at a second relative rate, and the first or second multi-band filter area is on the transmission path of the illumination beam.
11. The conversion method of the color gamut conversion module according to claim 10, characterized in that, The wavelength conversion element and the filter element rotate at a first relative rate and a second relative rate, including the filter element being stationary while the wavelength conversion element rotates relative to the filter element, or the wavelength conversion element and the filter element rotating synchronously or asynchronously.
12. The conversion method of the color gamut conversion module according to claim 10, characterized in that, In the first color gamut mode, the at least one single-band filter area and the first multi-band filter area are sequentially inserted into the transmission path of the illumination beam from the wavelength conversion element. In the second color gamut mode, the first multi-band filter area is in the transmission path of the illumination beam.
13. The conversion method of the color gamut conversion module according to claim 10, characterized in that, In the visible light transmission spectrum, the second multi-band filtering region includes a plurality of second bandpass bands and a plurality of second cutoff bands. Each of the plurality of second bandpass bands is located between two adjacent second cutoff bands in the plurality of second cutoff bands, and the plurality of second bandpass bands are different from the plurality of first bandpass bands.
14. The conversion method of the color gamut conversion module according to claim 13, characterized in that, In the first color gamut mode, the at least one single-band filter area, the first multi-band filter area, and the second multi-band filter area are sequentially inserted into the transmission path of the illumination beam from the wavelength conversion element. In the second color gamut mode, the first multi-band filter area is on the transmission path of the illumination beam. In the third color gamut mode, the wavelength conversion element and the filter element rotate at a third relative speed, and the second multi-band filter area is on the transmission path of the illumination beam.
15. The conversion method of the color gamut conversion module according to claim 13, characterized in that, In the first color gamut mode, the first multi-band filter area is on the transmission path of the illumination beam from the wavelength conversion element; in the second color gamut mode, the second multi-band filter area is on the transmission path of the illumination beam.
16. A projection device, characterized in that, The projection device includes an illumination module, a light valve, and a projection lens, wherein: The lighting module includes a light source and a color gamut conversion module. The light source provides an excitation beam, and the color gamut conversion module is positioned along the transmission path of the excitation beam. The color gamut conversion module includes: Wavelength conversion element, including at least two wavelength conversion regions; and A filter element is disposed on the transmission path of an illumination beam from the wavelength conversion element. The filter element includes a plurality of filter regions, one of which is a first multi-band filter region. The remaining filter regions include at least one single-band filter region and / or one second multi-band filter region. In the visible light transmission spectrum, the at least one single-band filter region includes a single bandpass band, while the first multi-band filter region includes a plurality of first bandpass bands and a plurality of first cutoff bands. Each of the plurality of first bandpass bands is located between two adjacent first cutoff bands. At least one of the plurality of first bandpass bands at least partially overlaps with the bandpass band. In the first color gamut mode, the wavelength conversion element and the filter element rotate at a first relative rate. In the second color gamut mode, the wavelength conversion element and the filter element rotate at a second relative rate, and the first multi-band filter area or the second multi-band filter area is on the transmission path of the illumination beam; The light valve is positioned along the transmission path of the illumination beam to convert the composite beam into an image beam; and The projection lens is positioned on the transmission path of the image beam to project the image beam outside the projection device.