Light mixing and combining system and working method thereof

Abstract

The application provides a light mixing and combining system and a working method thereof. The light mixing and combining system comprises a broadband light source, a narrowband light source, a light source controller and a light combining device. The light source controller is electrically connected to the broadband light source and the narrowband light source. The working states of the broadband light source and the narrowband light source are controlled by the light source controller. In the electrically conducting state, a broadband light beam is emitted by the broadband light source, and a narrowband light beam is emitted by the narrowband light source. The light combining device is located behind the light emission directions of the broadband light source and the narrowband light source. The broadband light beam and the narrowband light beam are combined into a mixed light beam by the light combining device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical technology, in particular to a mixed light beam combining system and a working method thereof. BACKGROUND

[0002] A projection display system is used to project a specific display pattern onto a display interface. With the continuous development of technology, the technology is applied in the technical fields of aviation, vehicle-mounted, wearable electronic devices, etc. The core part of the projection display system, such as vehicle-mounted HUD, AR / VR, digital ground projection lamp, etc. is the picture generation unit (PGU) in the optical system.

[0003] The mixed light beam combining system of the prior art generally uses R / G / B three-color LED or LD light source, collimates through 1-2 collimating lenses, and then generates white light by reflection type color filter combining. The combining architecture can have various arrangement modes, including “one” type, “L” type or “X” type. The mixed light beam combining system can be used in color image or black and white image display scenes.

[0004] The mixed light beam combining system of the prior art has at least one of the following defects: first, because multiple collimating light paths need to be combined, the whole mixed light beam combining system is large in size; second, because R / G / B three-color lamp beads need to be combined, the number of lamp beads and optical components required is large, and the cost is high; third, considering that the lamp beads need to be matched with the heat sink part, the assembly process is complex. SUMMARY

[0005] One main advantage of the present application is to provide a mixed light beam combining system and a working method thereof, wherein the mixed light beam combining system is small in size, facilitating the miniaturization of the device.

[0006] Another advantage of the present application is to provide a mixed light beam combining system and a working method thereof, wherein the mixed light beam combining system comprises a broadband light source, a narrowband light source, and a combining device arranged in the outgoing direction of the broadband light source and the narrowband light source. The mixed light beam combining system is simple to assemble and has high reliability.

[0007] Another advantage of the present application is to provide a mixed light beam combining system and a working method thereof, wherein the mixed light beam combining system does not need additional light beams for combining, which is beneficial to simplify the structure of the mixed light beam combining system and reduce the cost.

[0008] Another advantage of the present application is to provide a light mixing and combining system and a working method thereof, wherein the light mixing and combining system further comprises a light source controller, wherein the light source controller is electrically connected to the broadband light source and the narrowband light source, and the working current of the broadband light source and the narrowband light source is controlled by the light source controller, thereby forming different projection light patterns.

[0009] Another advantage of the present application is to provide a light mixing and combining system and a working method thereof, wherein the light mixing and combining system is suitable for vehicle-mounted HUD, AR / VR, digital ground projection, and other projection display systems.

[0010] Another advantage of the present application is to provide a light mixing and combining system and a working method thereof, wherein the light source controller of the light mixing and combining system controls the working current of the broadband light source and the narrowband light source through current control, and on the basis of realizing black and white image projection, the key content can also be highlighted by monochromatic light.

[0011] Another advantage of the present application is to provide a light mixing and combining system and a working method thereof, wherein the light mixing and combining system realizes the function of light mixing and combining only through two collimating light paths and a color filter, and the light mixing and combining system has small volume, low cost, and simple assembly.

[0012] Another advantage of the present application is to provide a light mixing and combining system and a working method thereof, wherein the light mixing and combining system can realize adjustment of the color gamut of the outgoing light within <1% or >3%.

[0013] Another advantage of the present application is to provide a light mixing and combining system and a working method thereof, wherein the light mixing and combining system does not require complex mechanical structures and expensive equipment. Therefore, the present application provides an economical and effective solution.

[0014] According to an aspect of the present application, a light mixing and combining system of the present application capable of achieving the aforementioned objects and other objects and advantages comprises:

[0015] a broadband light source and a narrowband light source;

[0016] a light source controller, wherein the light source controller is electrically connected to the broadband light source and the narrowband light source, the working state of the broadband light source and the narrowband light source is controlled by the light source controller, and in the electrically conductive state, a broadband light beam is emitted by the broadband light source, and a narrowband light beam is emitted by the narrowband light source; and

[0017] A beam combining device, wherein the beam combining device is located behind the broadband light source and the narrowband light source in the light emission direction, and the broadband light beam and the narrowband light beam are combined into a mixed light beam by the beam combining device.

[0018] According to an embodiment of the present application, the light source controller controls the working state of the broadband light source and the narrowband light source in a current control mode.

[0019] According to an embodiment of the present application, the light source controller has a white light working mode and a monochromatic light working mode, when the light source controller is in the white light working mode, the broadband light source and the narrowband light source are electrically turned on, when the light source controller is in the monochromatic light working mode, the narrowband light source is electrically turned on and the broadband light source is kept electrically turned off.

[0020] According to an embodiment of the present application, the light source controller has a white light working mode and a monochromatic light working mode, when the light source controller is in the white light working mode, the broadband light source is electrically turned on and the narrowband light source is kept electrically turned off, when the light source controller is in the monochromatic light working mode, the narrowband light source is electrically turned on and the broadband light source is kept electrically turned off.

[0021] According to an embodiment of the present application, the narrowband light source is a red light source, when the light source controller is in the white light working mode, the current of the narrowband light source is controlled to be 300mA-700mA, when the light source controller is in the monochromatic light working mode, the current of the narrowband light source is controlled to be 1500mA-3000mA.

[0022] According to an embodiment of the present application, the narrowband light source is a green monochromatic light source or a blue monochromatic light source, when the light source controller is in the white light working mode, the current of the narrowband light source is controlled to be 10%-25% of the rated current, when the light source controller is in the monochromatic light working mode, the current of the narrowband light source is controlled to be 50%-100% of the rated current.

[0023] According to an embodiment of the present application, the narrowband light source is a red light source, when the light source controller is in the white light working mode, the current of the narrowband light source is controlled to be 800mA-1000mA, when the light source controller is in the monochromatic light working mode, the current of the narrowband light source is controlled to be 1500mA-2200mA.

[0024] According to one embodiment of the present application, the narrow-band light source is a green monochromatic light source or a blue monochromatic light source, the current of the narrow-band light source is controlled at 28%-34% of the rated current when the light source controller is in the white light mode, and the current of the narrow-band light source is controlled at 50%-75% of the rated current when the light source controller is in the monochromatic light mode.

[0025] According to one embodiment of the present application, the difference between the spectral bandwidth of the wide-band light source and the spectral bandwidth of the narrow-band light source is greater than 150 nm.

[0026] According to one embodiment of the present application, the wide-band light source is selected from a light source combination consisting of a white light LED light source and a white light LD light source, and the narrow-band light source is selected from a light source combination consisting of a monochromatic light LED light source and a monochromatic light LD light source.

[0027] According to one embodiment of the present application, the wide-band light source is a white light LD light source, and the narrow-band light source is a monochromatic light LD light source.

[0028] According to one embodiment of the present application, the beam combining device is selected from a combination consisting of a monochromatic light filter, a filter coated with a PS film layer, a reflective filter, and a light combining optical fiber.

[0029] According to one embodiment of the present application, the wide-band light source is a white light lamp bead, the narrow-band light source is a red light lamp bead, and the beam combining device is a filter coated with a red-transmitting and blue-green-reflection film layer.

[0030] According to one embodiment of the present application, the beam combining device is a filter coated with a green-transmitting and blue-reflection film layer or a blue-transmitting and red-green-reflection film layer.

[0031] According to one embodiment of the present application, the wide-band light source is a white light laser lamp bead, the narrow-band light source is a monochromatic light laser lamp bead, and the beam combining device is a filter coated with a PS film layer.

[0032] According to one embodiment of the present application, the wide-band light source is a white light LED light source, the narrow-band light source is a red fiber laser light source, and the beam combining device is a reflective filter.

[0033] According to one embodiment of the present application, the beam combining device comprises a filter main body and at least one light-transmitting portion, the filter main body has a reflection surface, the reflection surface of the filter main body faces the direction of the wide-band light source, the narrow-band light source is directly opposite the light-transmitting portion of the beam combining device, and the narrow-band light beam emitted by the narrow-band light source is transmitted through the light-transmitting portion of the beam combining device.

[0034] According to one embodiment of the present application, the light-transmitting portion is a hole formed in the filter main body.

[0035] According to one embodiment of the present application, the broadband light source is a white light fiber laser light source, the narrowband light source is a red light fiber laser light source, and the beam combining device is a beam combining fiber.

[0036] According to one embodiment of the present application, further comprising at least one broadband collimating lens and at least one narrowband collimating lens, wherein the broadband collimating lens is disposed between the broadband light source and the beam combining device, and the narrowband collimating lens is disposed between the narrowband light source and the beam combining device.

[0037] According to one embodiment of the present application, further comprising at least one broadband collimating lens and at least one beam combining collimating lens, wherein the broadband collimating lens is disposed between the broadband light source and the beam combining device, and the beam combining collimating lens is disposed behind the beam combining device in the direction of light emission.

[0038] According to one embodiment of the present application, further comprising at least one beam combining collimating lens, wherein the beam combining collimating lens is disposed behind the beam combining device in the direction of light emission.

[0039] According to another aspect of the present application, the present application provides a method for operating a light mixing and beam combining system, wherein the method comprises the following steps:

[0040] (a) controlling the operating states of a broadband light source and a narrowband light source, wherein the broadband light source emits a broadband light beam when electrically turned on, and the narrowband light source emits a narrowband light beam when electrically turned on; and

[0041] (b) combining the broadband light beam and the narrowband light beam into a mixed light beam by a beam combining device, and projecting the mixed light beam outward.

[0042] According to one embodiment of the present application, in the step (a), the operating states of the broadband light source and the narrowband light source are controlled by a light source controller in a current control manner.

[0043] According to one embodiment of the present application, in the step (a), the light source controller has a white light operating mode and a monochromatic light operating mode, wherein the broadband light source and the narrowband light source are electrically turned on when the light source controller is in the white light operating mode, and the narrowband light source is electrically turned on and the broadband light source is kept in an electrically turned-off state when the light source controller is in the monochromatic light operating mode.

[0044] According to one embodiment of the present application, in the step (a), the narrow-band light source is a red light source, when the light source controller is in the white light working mode, the current of the narrow-band light source is controlled in 300mA-700mA; when the light source controller is in the monochromatic light working mode, the current of the narrow-band light source is controlled in 1500mA-3000mA.

[0045] According to one embodiment of the present application, in the step (a), the narrow-band light source is a green light monochromatic light source or a blue light monochromatic light source, when the light source controller is in the white light working mode, the current of the narrow-band light source is controlled in 10%-25% of the rated current; when the light source controller is in the monochromatic light working mode, the current of the narrow-band light source is controlled in 50%-100% of the rated current.

[0046] According to one embodiment of the present application, in the step (a), the narrow-band light source is a red light source, when the light source controller is in the white light working mode, the current of the narrow-band light source is controlled in 800mA-1000mA; when the light source controller is in the monochromatic light working mode, the current of the narrow-band light source is controlled in 1500mA-2200mA.

[0047] According to one embodiment of the present application, in the step (a), the narrow-band light source is a green light monochromatic light source or a blue light monochromatic light source, when the light source controller is in the white light working mode, the current of the narrow-band light source is controlled in 28%-34% of the rated current; when the light source controller is in the monochromatic light working mode, the current of the narrow-band light source is controlled in 50%-75% of the rated current.

[0048] According to one embodiment of the present application, in the step (a), the light source controller has a white light working mode and a monochromatic light working mode, wherein when the light source controller is in the white light working mode, the wide-band light source is electrically conducted and the narrow-band light source is kept in an electrically disconnected state; when the light source controller is in the monochromatic light working mode, the narrow-band light source is electrically conducted and the wide-band light source is kept in an electrically disconnected state.

[0049] According to one embodiment of the present application, the wide-band light source is selected from a light source combination consisting of a white light LED light source, a white light LD light source and a white light fiber laser light source; the narrow-band light source is selected from a light source combination consisting of a monochromatic light LED light source, a monochromatic light LD light source and a monochromatic light fiber laser light source.

[0050] According to one embodiment of the present application, the wide-band light source is a white light LD light source; the narrow-band light source is a monochromatic light LD light source

[0051] According to one embodiment of the present application, the beam combining device is selected from the group consisting of a single color filter, a color filter coated with a PS film layer, a reflective color filter, and a combining fiber.

[0052] Further objects and advantages of the present application will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings.

[0053] These and other objects, features and advantages of the present application will be more fully understood from the following detailed description taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 is a system diagram of a light mixing and combining system according to a first preferred embodiment of the present application.

[0055] Figure 2 is a chromaticity diagram of the light mixing and combining system according to the first preferred embodiment of the present application.

[0056] Figure 3 is a system diagram of a light mixing and combining system according to a second preferred embodiment of the present application.

[0057] Figure 4 is a chromaticity diagram of the light mixing and combining system according to the second preferred embodiment of the present application.

[0058] Figure 5 is a system diagram of a light mixing and combining system according to a third preferred embodiment of the present application.

[0059] Figure 6 is a chromaticity diagram of the light mixing and combining system according to the third preferred embodiment of the present application.

[0060] Figure 7 is a system diagram of a light mixing and combining system according to a fourth preferred embodiment of the present application.

[0061] Figure 8 is a chromaticity diagram of the light mixing and combining system according to the fourth preferred embodiment of the present application.

[0062] Figure 9 is a system diagram of a method of operating the light mixing and combining system according to the preferred embodiments of the present application. DETAILED DESCRIPTION

[0063] The following description is presented to enable any person skilled in the art to practice the present application as claimed. The preferred embodiments disclosed herein are only examples of the present application and alternative embodiments can be devised by persons skilled in the art without departing from the spirit and scope of the present application. The present application is defined by the following claims with equivalences of the claims also intended to be covered. The terminology used in the description presented herein is intended to be interpreted in accordance with the terminology of human beings and not in accordance with the terminology of a computer or computing technology.

[0064] Those skilled in the art should understand that in the disclosure of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0065] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation of the number.

[0066] Referring to the drawings of the present application Figure 1 and Figure 2 The light mixing and combining system and the working method thereof according to the first preferred embodiment of the present application are illustrated in the following description. The light mixing and combining system is suitable for a projection display system, such as a vehicle-mounted HUD, AR / VR, ground projection lamp, etc., and the illumination beam required by the projection display system is projected by the light mixing and combining system. The light mixing and combining system comprises a broadband light source 10, a narrowband light source 20, a beam combining device 30 arranged at the light exit end of the broadband light source 10 and the narrowband light source 20, and a light source controller 40, wherein the broadband light source 10 and the narrowband light source 20 are electrically connected to the light source controller 40, and the working state of the broadband light source 10 and the narrowband light source 20 is controlled by the light source controller 40.

[0067] The broadband light source 10 is controlled by the light source controller 40 and emits a broadband light beam 110 to the beam combining device 30 when electrically conducting, and the narrowband light source 20 is controlled by the light source controller 40 and emits a narrowband light beam 210 to the beam combining device 30 when electrically conducting. The broadband light beam and the narrowband light beam are combined into a mixed light beam 310 by the beam combining device 30 and projected outward. It can be understood that in this preferred embodiment of the present application, the spectral bandwidth of the broadband light source 10 is greater than the spectral bandwidth of the narrowband light source 20. Preferably, in this preferred embodiment of the present application, the difference between the spectral bandwidth of the broadband light source 10 and the spectral bandwidth of the narrowband light source 20 is greater than 150 nm, so that when the light emitted by the broadband light source and the light emitted by the narrowband light source are mixed, white light is presented. Preferably, the broadband light source 10 of the light mixing and combining system is a white light source, and the narrowband light source 20 is a monochromatic light source.

[0068] As an example, in the preferred embodiment of the present application, the broadband light source is a LED white light bead or a LD white light bead, and the narrowband light source 20 is a LED red light bead or a LD red light bead.

[0069] It is worth mentioning that, compared with the prior art using R / G / B three-color LED or LD light source, in the preferred embodiment of the present application, the light mixing and combining system only needs two light beams to realize the light mixing and combining required by the projection display system. Therefore, compared with the light mixing and combining system of the prior art, the light mixing and combining system of the preferred embodiment of the present application has small volume, low cost and simple assembly.

[0070] In detail, the light source controller 40 controls the working state and current size of the broadband light source 10 and the narrowband light source 20, thereby controlling the color gamut display range of the mixed light beam 310 combined by the combining device 30. Therefore, by controlling the broadband light source 10 and the narrowband light source 20 in the form of current or voltage control through the light source controller 40, the mixed light beam 310 combined by the combining device 30 has a color gamut display range with obvious visual difference, so as to provide the projection display system with illumination light based on the color gamut display range, so that the projection display system can project images with obvious visual difference. In short, the illumination light provided by the light mixing and combining system can allow the projection display system to select the color gamut display range of the mixed light beam based on different display contents.

[0071] As an example, in the preferred embodiment of the present application, when the light source controller 40 controls the working current of the broadband light source 10 and the narrowband light source 20 in a specific working current control scheme, so that the mixed light beam 310 combined by the combining device 30 is a white light beam, to adapt to the projection display system to project black and white images (patterns) of general display information; when the light source controller 40 controls the working current of the broadband light source 10 and the narrowband light source 20 in another specific working current control scheme, so that the mixed light beam 310 combined by the combining device 30 is a monochromatic light beam (such as monochromatic red light), to adapt to the projection display system to project images (patterns) with obvious prompt information.

[0072] As Figure 1As shown, the broadband light beam 110 emitted by the broadband light source 10 is projected onto the beam combiner 30, wherein a portion of the broadband light beam 110 is transmitted through the beam combiner. The narrowband light beam 210 emitted by the narrowband light source 20 is projected onto the beam combiner 30, wherein a portion of the narrowband light beam 210 is reflected by the beam combiner 30, such that the partially transmitted broadband light beam 110 and the reflected narrowband light beam 210 are combined into the mixed light beam 310. Preferably, the beam combiner 30 is a color filter coated with a red-reflecting and blue-green-transmitting film layer. Optionally, in other alternative embodiments of the present invention, the narrowband light source 20 may also be implemented as other monochromatic light sources, and the beam combiner 30 may be implemented as a monochromatic light filter matching the narrowband light source 20.

[0073] In this preferred embodiment of the invention, the combination of red and white light is achieved by designing the transmittance or reflectance of the color filter for different wavelengths.

[0074] In detail, the light source controller 40 has a white light working mode and a monochromatic light working mode. When the light source controller 40 is in the white light working mode, it controls the broadband light source 10 and the narrowband light source 20 to work simultaneously, and the beam combining device 30 combines them to produce white light. When the light source controller 40 is in the monochromatic light working mode, it controls the broadband light source 10 to not work, and the narrowband light source 20 to work, that is, current flows through the narrowband light source 20, and the beam combining device 30 combines them to produce red light.

[0075] like Figure 2 The color gamut display range of the illumination light emitted by the light mixing and beam combining system under two different operating states of the light source controller 40 is shown, using the NTSC 1931 color gamut standard. When the light source controller 40 is in the white light operating mode, the color gamut display range is as follows: Figure 2 As shown in the M region, the value is less than 1%, where the horizontal axis represents the color coordinate Cx value and the vertical axis represents the color coordinate Cy value; when the light source controller 40 is in the monochromatic light working mode, the color gamut display range is as follows. Figure 2 As shown in region N, it is greater than 3%. Therefore, when the light source controller 40 is in two different operating states, the illumination beam projected by the light mixing and beam combining system has a clearly visually identifiable color gamut display range, so that the light mixing and beam combining system can provide visually identifiable illumination light for different projected images (graphics) of the projection display system under different operating states. It is worth mentioning that in this preferred embodiment of the present invention, the luminous efficacy of the white LED can reach 88%, and the luminous efficacy of the red LED can reach 41%.

[0076] As an example, when the light source controller 40 is in the white light working mode, the white light projected by the mixed light combining system is suitable for providing the illumination light for the projection display system to display black and white images; when the light source controller 40 is in the monochromatic light working mode, the red light projected by the mixed light combining system is suitable for providing the red light with obvious prompt information for the projection display system.

[0077] Preferably, in the preferred embodiment of the present application, the narrow-band light source 20 is implemented as a red light bead, when the mixed light combining system is in the white light working mode, the current of the narrow-band light source 20 is controlled at 300mA-700mA; when the light source controller 40 is in the monochromatic light working mode, the current of the narrow-band light source 20 is controlled at 1500mA-3000mA. Alternatively, in other optional embodiments of the present application, the narrow-band light source 20 is implemented as a blue light bead or a green light bead, when the light source controller 40 is in the white light working mode, the current of the narrow-band light source 20 is controlled at 10%-25% of the rated current; when the light source controller 40 is in the monochromatic light working mode, the current of the narrow-band light source 20 is controlled at 50%-100% of the rated current.

[0078] As shown in Figure 1 The mixed light combining system further comprises at least one wide-band collimating lens 50 and at least one narrow-band collimating lens 60, wherein the wide-band collimating lens 50 is arranged between the wide-band light source 10 and the combining device 30, and the narrow-band collimating lens 60 is arranged between the narrow-band light source 20 and the combining device 30, the wide-band light beam 110 is collimated by the wide-band collimating lens 50, and the narrow-band light beam 210 is collimated by the narrow-band collimating lens 60, thereby improving the projection effect of the illumination light. Preferably, in the preferred embodiment of the present application, the wide-band collimating lens 50 further comprises a first wide-band collimating lens 51 and a second wide-band collimating lens 52, wherein the first wide-band collimating lens is located at the front end of the light incident direction of the second collimating lens 52, that is, the wide-band light beam emitted by the wide-band light source 10 is transmitted to the second wide-band collimating lens 52 after being collimated by the first wide-band collimating lens, and then the wide-band light beam is collimated by the second wide-band collimating lens 52 and projected to the combining device 30. The narrow-band collimating lens 60 further comprises a first narrow-band collimating lens 61 and a second narrow-band collimating lens 62, wherein the first narrow-band collimating lens is located at the front end of the light incident direction of the second collimating lens 62, that is, the narrow-band light beam emitted by the narrow-band light source 20 is transmitted to the second narrow-band collimating lens 62 after being collimated by the first narrow-band collimating lens, and then the narrow-band light beam is collimated by the second narrow-band collimating lens 62 and projected to the combining device 30.

[0079] Referring to the drawings of the present application Figure 3 and Figure 4 As shown in the accompanying drawings, a light mixing and combining system and its working method according to the second preferred embodiment of the present application are illustrated in the following description. The light mixing and combining system comprises a broadband light source 10A, a narrowband light source 20A, a combining device 30A arranged at the light emitting end of the broadband light source 10A and the narrowband light source 20A, and a light source controller 40A, wherein the broadband light source 10A and the narrowband light source 20A are electrically connected to the light source controller 40A, and the working state of the broadband light source 10A and the narrowband light source 20A is controlled by the light source controller 40A. The light mixing and combining system further comprises at least one broadband collimating lens 50A and at least one narrowband collimating lens 60A, wherein the broadband collimating lens 50A is arranged between the broadband light source 10A and the combining device 30A, and the narrowband collimating lens 60A is arranged between the narrowband light source 20A and the combining device 30A, the broadband collimating lens 50A collimates the broadband light beam 110A, and the narrowband collimating lens 60A collimates the narrowband light beam 210A, thereby improving the projection effect of the illumination light. The broadband collimating lens 50A further comprises a first broadband collimating lens 51A and a second broadband collimating lens 52A, and the narrowband collimating lens 60A further comprises a first narrowband collimating lens 61A and a second narrowband collimating lens 62A. The broadband light source 10A is controlled by the light source controller 40A, and emits a broadband light beam 110A to the combining device 30A when electrically connected. The narrowband light source 20A is controlled by the light source controller 40A, and emits a narrowband light beam 210A to the combining device 30A when electrically connected. The broadband light beam and the narrowband light beam are combined into a mixed light beam 310A by the combining device 30A, and projected outward.

[0080] Different from the first preferred embodiment, the broadband light source 10A and the narrowband light source 20A are laser light sources, i.e. the broadband light source 10A is a white laser light bead, and the narrowband light source 20A is a monochromatic laser light bead. The combining device 30A is a color filter coated with a PS film layer, wherein the broadband light beam emitted by the broadband light source 10A is P-polarized light, and the narrowband light emitted by the narrowband light source 20A is S-polarized light. Therefore, in this preferred embodiment of the present application, the broadband light beam and the narrowband light beam are combined by the combining device based on the characteristics of the PS film that transmits P light and reflects S light. It is worth mentioning that, in this preferred embodiment of the present application, the narrowband light source 20A and the broadband light source 10A are LD light sources.

[0081] Preferably, in this preferred embodiment of the present invention, the narrowband light source 20A is implemented as a red LED. When the light mixing and beam combining system is in the white light operating mode, the current of the narrowband light source 20A is controlled at 800mA-1000mA; when the light source controller 40A is in the monochromatic light operating mode, the current of the narrowband light source 20A is controlled at 1500mA-2200mA. Optionally, in other alternative embodiments of the present invention, the narrowband light source 20A is implemented as a blue or green LED. When the light source controller 40A is in the white light operating mode, the current of the narrowband light source 20A is controlled at 28%-34% of the rated current; when the light source controller 40A is in the monochromatic light operating mode, the current of the narrowband light source 20A is controlled at 50%-75% of the rated current.

[0082] like Figure 4 The color gamut display range of the illumination light emitted by the light mixing and beam combining system under two different operating states of the light source controller 40A is shown, using the NTSC 1931 color gamut standard. When the light source controller 40A is in the white light operating mode, the color gamut display range is as follows: Figure 4 As shown in the P region, the value is less than 1%, where the horizontal axis represents the color coordinate Cx value and the vertical axis represents the color coordinate Cy value; when the light source controller 40A is in the monochromatic light working mode, the color gamut display range is as follows. Figure 4 As shown in the Q region, it is greater than 3%. Therefore, when the light source controller 40A is in two different operating states, the illumination beam projected by the light mixing and beam combining system has a clearly visually identifiable color gamut display range, so that the light mixing and beam combining system can provide visually identifiable illumination light for different projected images (graphics) of the projection display system under different operating states. It is worth mentioning that in this preferred embodiment of the present invention, the luminous efficacy of the white LED can reach 84%, and the luminous efficacy of the red LED can reach 86%.

[0083] Preferably, in this preferred embodiment of the present invention, the light source controller 40A controls the operating current of the narrowband light source 20A to be 50%-100% of the rated current.

[0084] Referring to the accompanying drawings of this invention Figure 5 and Figure 6As shown, a light mixing and combining system according to a third preferred embodiment of the present application is illustrated in the following description. The light mixing and combining system comprises a broadband light source 10B, a narrowband light source 20B, a combining device 30B disposed at the light emitting end of the broadband light source 10B and the narrowband light source 20B, and a light source controller 40B, wherein the broadband light source 10B and the narrowband light source 20B are electrically connected to the light source controller 40B, and the working states of the broadband light source 10B and the narrowband light source 20B are controlled by the light source controller 40B. The broadband light source 10B is controlled by the light source controller 40B, and emits a broadband light beam 110B to the combining device 30B when electrically conducting. The narrowband light source 20B is controlled by the light source controller 40B, and emits a narrowband light beam 210B to the combining device 30B when electrically conducting. The broadband light beam and the narrowband light beam are combined into a mixed light beam 310B by the combining device 30B, and projected outwardly.

[0085] Different from the first preferred embodiment described above, the broadband light source 10B is a white light LED or LD light source, the narrowband light source 20B is a monochromatic fiber laser light source, and the combining device 30B is a reflective color filter, wherein the broadband light beam 110B emitted by the broadband light source 10B is reflected by the combining device 30B, the narrowband light beam 210B emitted by the narrowband light source 20B is transmitted through the combining device 30B, and combined with the broadband light beam 110B into the mixed light beam 310B. That is, in this preferred embodiment of the present application, the monochromatic light laser emitted by the narrowband light source 20B is transmitted or penetrated through the combining device 30B, and combined with the reflected broadband light beam 210B into the mixed light beam 310B.

[0086] Preferably, in this preferred embodiment of the present application, the narrowband light source 20B is a red fiber laser.

[0087] The combining device 30B comprises a light filtering body 31B and at least one light transmitting portion 32B, wherein the light filtering body 31B has a reflecting surface, and the reflecting surface of the light filtering body 31B is directed towards the broadband light source 10B, so that the broadband light beam 110B emitted by the broadband light source 10B is reflected by the light filtering body 31B of the combining device 30B. The narrowband light source 20B is directly opposite to the light transmitting portion 32B of the combining device 30B, wherein the narrowband light beam 210B emitted by the narrowband light source 20B is transmitted through the light transmitting portion 32B of the combining device 30B, and combined with the reflected light of the broadband light beam 110B into the mixed light beam 310B after transmission.

[0088] Preferably, in this preferred embodiment of the present application, the light-transmitting portion 32B is a hole formed in the light-filtering body 31B, wherein the monochromatic light laser emitted by the narrow-band light source 20B can pass through the light-transmitting portion 32B of the beam-combining device 30B and combine with the reflected light of the broadband light beam 210B. Alternatively, in other alternative embodiments of the present application, the light-transmitting portion 32B can also be implemented as a light-transmitting glass.

[0089] It is worth mentioning that, since the narrow-band light source 20B in the present application adopts a fiber laser light source, the light spot emitted thereby is small and can exit through the light-transmitting portion 32B of the beam-combining device 30B, wherein the broadband light source 10B is an LED light source and the light is combined by surface reflection of the beam-combining device 30B.

[0090] The light source controller 40B has a white light working mode, a monochromatic light working mode and a mixed light working mode, wherein when the light source controller 40B is in the mixed light working mode, the light source controller 40B controls the broadband light source 10B and the narrow-band light source 20B to work simultaneously, and the mixed light with a laser beam is combined by the beam-combining device 30B; when the light source controller 40B is in the monochromatic light working mode, the light source controller 40B controls the broadband light source 10B not to work and controls the narrow-band light source 20B to work, i.e. the narrow-band light source 20B has current passing therethrough, and the monochromatic red light is transmitted by the beam-combining device 30B; when the light source controller 40B is in the white light working mode, the light source controller 40B controls the broadband light source 10B to work and controls the narrow-band light source 20B not to work, i.e. the white light is reflected by the beam-combining device 30B.

[0091] As Figure 6 The color gamut display range of the illumination light emitted by the mixed light beam-combining system in two different working states of the light source controller 40B is shown, using the NTSC1931 color gamut standard, when the light source controller 40B is in the white light working mode, the color gamut display range is as shown in the X region in the figure, which is less than 1%, wherein the abscissa in the figure is the color coordinate Cx value and the ordinate is the color coordinate Cy value; when the light source controller 40B is in the monochromatic light working mode, the color gamut display range is as shown in the Y region in the figure, which is less than 1%. Figure 6 Figure 6 ​As shown in the color gamut area Y, the color gamut area Y is greater than 3%. Therefore, when the light source controller 40B is in two different working states, the illumination light beam projected by the light mixing and combining system has a visually recognizable color gamut display range, so as to provide visually recognizable illumination light for different projection images (patterns) of the projection display system by the light mixing and combining system in different working states. It is worth mentioning that in this preferred embodiment of the present application, the light efficiency of the white light beads can reach 68%, and the light efficiency of the red light beads can reach 76%. It is worth mentioning that the narrow-band light source emitted by the narrow-band light source 20B is transmitted outward through the combining device 30B, and no energy loss occurs during the combining process of the combining device 30B, thereby improving the utilization rate of light source energy.

[0092] For example, when the light source controller 40B is in the white light working mode, the white light projected by the light mixing and combining system is suitable for providing illumination light for black and white image display of the projection display system; when the light source controller 40B is in the monochromatic light working mode, the red light projected by the light mixing and combining system is suitable for providing red light with obvious prompt information for the projection display system.

[0093] The light mixing and combining system further comprises at least one wide-band collimating lens 50B and at least one combining collimating lens 70B, wherein the wide-band collimating lens 50B is arranged between the wide-band light source 10B and the combining device 30B, and the combining collimating lens 70B is arranged behind the light exit direction of the combining device 30B. The wide-band collimating lens 50B collimates the wide-band light beam 110B, and the combining collimating lens 70B collimates the mixed light beam 310B, thereby improving the projection effect of the illumination light. The wide-band collimating lens 50B further comprises a first wide-band collimating lens 51B and a second wide-band collimating lens 52B.

[0094] The above and other objects, features and advantages of the present application will become apparent from the following description of the preferred embodiment, taken in conjunction with the accompanying drawings, in which: Figure 7 and Figure 8As shown, a light mixing and combining system according to a fourth preferred embodiment of the present application is illustrated in the following description. The light mixing and combining system comprises a broadband light source 10C, a narrowband light source 20C, a combining device 30C disposed at the light emitting ends of the broadband light source 10C and the narrowband light source 20C, and a light source controller 40C, wherein the broadband light source 10C and the narrowband light source 20C are electrically connected to the light source controller 40C, and the working states of the broadband light source 10C and the narrowband light source 20C are controlled by the light source controller 40C. The broadband light source 10C is controlled by the light source controller 40C, and emits a broadband light beam 110C to the combining device 30C when electrically conducting. The narrowband light source 20C is controlled by the light source controller 40C, and emits a narrowband light beam 210C to the combining device 30C when electrically conducting. The broadband light beam and the narrowband light beam are combined into a mixed light beam 310C by the combining device 30C, and are projected outwardly.

[0095] Different from the first preferred embodiment described above, the broadband light source 10C is a white light fiber laser light source, the narrowband light source 20C is a monochromatic light fiber laser light source, and the combining device 30C is a light combining fiber, wherein the broadband light beam 110C emitted by the broadband light source 10C and the narrowband light beam 210C emitted by the narrowband light source 20C are projected to the combining device 30C, and the broadband light beam 110C and the narrowband light beam 210C are combined into the mixed light beam 310C by the combining device 30C. That is, in this preferred embodiment of the present application, the monochromatic light laser emitted by the narrowband light source 20C is combined with the reflected broadband light beam 210C by the combining device 30C into the mixed light beam 310C.

[0096] Preferably, the narrowband light source 20C is a red light fiber laser.

[0097] The light source controller 40C has a white light working mode, a monochromatic light working mode, and a mixed light working mode. When the light source controller 40C is in the mixed light working mode, it controls the broadband light source 10C and the narrowband light source 20C to work simultaneously, and the beam combiner 30C combines the mixed light containing the laser beam and projects it outwards. When the light source controller 40C is in the monochromatic light working mode, it controls the broadband light source 10C to be inactive, while the narrowband light source 20C is active, meaning current flows through it, and the beam combiner 30C projects monochromatic red laser light outwards. When the light source controller 40C is in the white light working mode, it controls the broadband light source 10C to be active and controls the narrowband light source 20C to be inactive, and the beam combiner 30C projects white laser light outwards.

[0098] like Figure 8 The color gamut display range of the illumination light emitted by the light mixing and beam combining system under two different operating states of the light source controller 40C is shown, using the NTSC 1931 color gamut standard. When the light source controller 40C is in the white light operating mode, the color gamut display range is as follows: Figure 8 As shown in region A, the value is less than 0.5%, where the horizontal axis represents the color coordinate Cx value and the vertical axis represents the color coordinate Cy value; when the light source controller 40C is in the monochromatic light working mode, the color gamut display range is as follows. Figure 8 As shown in the Z region, it is greater than 2%. Therefore, when the light source controller 40C is in two different operating states, the illumination beam projected by the light mixing and beam combining system has a clearly visually identifiable color gamut display range, so that the light mixing and beam combining system can provide visually identifiable illumination light for different projected images (graphics) of the projection display system under different operating states. It is worth mentioning that, in this preferred embodiment of the present invention, the luminous efficacy of the white LED can reach 99%, and the luminous efficacy of the red LED can reach 99%.

[0099] As an example, when the light source controller 40C is in the white light working mode, the white light projected by the light mixing and beam combining system is suitable for providing illumination light for displaying black and white images in the projection display system; when the light source controller 40C is in the monochromatic light working mode, the red light projected by the light mixing and beam combining system is suitable for providing red light with obvious prompt information in the projection display system.

[0100] The mixed light beam combining system further comprises at least one beam combining collimating lens 70C, wherein the beam combining collimating lens 70C is arranged behind the light exit direction of the beam combining device 30C, and the mixed light beam 310C is collimated by the beam combining collimating lens 70C, thereby improving the projection effect of the illumination light.

[0101] The working method of the mixed light beam combining system according to another aspect of the present application is illustrated in the following description in conjunction with the drawings of the present application, wherein the working method of the mixed light beam combining system comprises the following steps: Figure 9 The working method of the mixed light beam combining system according to another aspect of the present application is illustrated in the following description in conjunction with the drawings of the present application, wherein the working method of the mixed light beam combining system comprises the following steps:

[0102] (a) controlling the working states of a broadband light source 10 and a narrowband light source 20, wherein the broadband light source 10 emits a broadband light beam 110 when electrically conducting the broadband light source 10, and the narrowband light source 20 emits a narrowband light beam 210 when electrically conducting the narrowband light source 20; and

[0103] (b) combining the broadband light beam 110 and the narrowband light beam 210 into a mixed light beam 310 by a beam combining device 30, and projecting outwardly.

[0104] In the working method of the mixed light beam combining system according to the preferred embodiment of the present application, the difference between the spectral bandwidth of the broadband light source 10 and the spectral bandwidth of the narrowband light source 20 is greater than 150 nm.

[0105] In the working method of the mixed light beam combining system according to the preferred embodiment of the present application, wherein in the step (a), the working states of the broadband light source 10 and the narrowband light source 20 are controlled by a light source controller 40 in a current control manner.

[0106] In the working method of the mixed light beam combining system according to the preferred embodiment of the present application, wherein in the step (a), the light source controller 40 has a white light working mode and a monochromatic light working mode, wherein when the light source controller 40 is in the white light working mode, the broadband light source 10 and the narrowband light source 20 are electrically conducted, and when the light source controller 40 is in the monochromatic light working mode, the narrowband light source 20 is electrically conducted, and the broadband light source 10 is kept in an electrically disconnected state.

[0107] In the working method of the mixed light beam combining system according to the preferred embodiment of the present application, wherein in the step (a), the light source controller 40 controls the working current of the narrowband light source 20 to be 50%-100% of the rated current.

[0108] In the operation method of the mixed light combined beam system of the preferred embodiment of the present application, in the step (a), the light source controller 40 has a white light operation mode and a monochromatic light operation mode, wherein when the light source controller 40 is in the white light operation mode, the broadband light source 10 is electrically turned on and the narrowband light source 20 is kept in an electrically turned off state; when the light source controller 40 is in the monochromatic light operation mode, the narrowband light source 20 is electrically turned on and the broadband light source 10 is kept in an electrically turned off state.

[0109] In the operation method of the mixed light combined beam system of the preferred embodiment of the present application, the broadband light source 10 is selected from a light source combination consisting of a white light LED light source, a white light LD light source and a white light fiber laser light source. In the operation method of the mixed light combined beam system of the preferred embodiment of the present application, the narrowband light source 20 is selected from a light source combination consisting of a red light LED light source, a red light LD light source and a red light fiber laser light source.

[0110] In the operation method of the mixed light combined beam system of the preferred embodiment of the present application, the combined beam device is selected from a combination consisting of a monochromatic light filter, a filter coated with a PS film layer, a reflective filter and a light combining fiber.

[0111] In the operation method of the mixed light combined beam system of the preferred embodiment of the present application, in the step (b), wherein the broadband light beam 110 and the narrowband light beam 210 are combined into the mixed light beam 310 after being collimated. In the operation method of the mixed light combined beam system of the preferred embodiment of the present application, in the step (b), wherein the broadband light beam 110 and the narrowband light beam 210 are combined into the mixed light beam 310 after being collimated. In the operation method of the mixed light combined beam system of the preferred embodiment of the present application, in the step (b), wherein the mixed light beam 310 is projected outward after being collimated.

[0112] It is to be understood that the embodiments of the present application shown in the above description and drawings are only exemplary and not limiting the present application. The object of the present application has been completely and effectively achieved. The function and structural principle of the present application has been shown and described in the embodiments, and the embodiments of the present application can be modified or changed in any way without departing from the principle.

Claims

1. A mixed-beam beam combining system, characterized in that, A projection display system for vehicles, including: A broadband light source and a narrowband light source; A light source controller is provided, wherein the light source controller is electrically connected to the broadband light source and the narrowband light source, and controls the operating state of the broadband light source and the narrowband light source. The light source controller has a white light operating mode and a monochromatic light operating mode, wherein when the light source controller is in the white light operating mode, the broadband light source and the narrowband light source are electrically connected; when the light source controller is in the monochromatic light operating mode, the narrowband light source is electrically connected and the broadband light source is electrically disconnected. In the electrically conductive state, a broadband light beam is emitted by the broadband light source, and a narrowband light beam is emitted by the narrowband light source; and A beam combiner is located behind the light emission directions of the broadband light source and the narrowband light source. The broadband beam and / or the narrowband beam is projected onto the beam combiner. The narrowband light source is a red light source. When the light source controller is in the white light operating mode, the current of the narrowband light source is controlled at 800-1000mA. When the light source controller is in the monochromatic light operating mode, the current of the narrowband light source is controlled at 1500mA-2200mA. The illumination light provided by the light mixing and beam combining system allows the projection display system to select the appropriate color gamut display range of the mixed beam based on different display content. When the light source controller is in the white light working mode, the color gamut display range of the emitted light of the light mixing and beam combining system is less than 1%. When the light source controller is in the monochromatic light working mode, the color gamut display range of the emitted light of the light mixing and beam combining system is greater than 3%. Wherein, the difference between the spectral bandwidth of the broadband light source and the spectral bandwidth of the narrowband light source is greater than 150nm, the broadband light source is a white light LD light source, the narrowband light source is a monochromatic light LD light source, and the beam combining device is a color filter coated with a PS film layer.

2. The beam combining system according to claim 1, wherein the light source controller controls the operating state of the broadband light source and the narrowband light source in a current-controlled manner.

3. The beam combining system according to claim 1, wherein the beam combining device includes a filter body and at least one light-transmitting part, wherein the filter body has a reflective surface, the reflective surface of the filter body is oriented toward the broadband light source, the narrowband light source is directly opposite the light-transmitting part of the beam combining device, and the narrowband light beam emitted by the narrowband light source is transmitted through the light-transmitting part of the beam combining device.

4. The light mixing and beam combining system according to claim 3, wherein the light-transmitting portion is a hole formed in the filter body.

5. The beam combining system according to claim 1, further comprising at least one broadband collimating lens and at least one narrowband collimating lens, wherein the broadband collimating lens is disposed between the broadband light source and the beam combining device, and the narrowband collimating lens is disposed between the narrowband light source and the beam combining device.

6. The beam combining system according to claim 1 further includes at least one broadband collimating lens and at least one beam combining collimating lens, wherein the broadband collimating lens is disposed between the broadband light source and the beam combining device, and the beam combining collimating lens is disposed behind the light emission direction of the beam combining device.

7. The beam combining system according to claim 1, further comprising at least one beam combining collimating lens, wherein the beam combining collimating lens is disposed behind the beam combining device in the light emission direction.

8. A method for operating a mixed-beam combining system, characterized in that, The working method described herein is used for a vehicle projection display system and includes the following steps: (a) Controlling the operating states of a broadband light source and a narrowband light source, wherein when the broadband light source is electrically connected, it emits a broadband light beam; and when the narrowband light source is electrically connected, it emits a narrowband light beam, wherein the operating states of the broadband light source and the narrowband light source are controlled by a light source controller in a current-controlled manner, the light source controller having a white light operating mode and a monochromatic light operating mode, wherein when the light source controller is in the white light operating mode, the broadband light source and the narrowband light source are electrically connected; and when the light source controller is in the monochromatic light operating mode, the narrowband light source is electrically connected, while the broadband light source remains electrically disconnected; wherein the narrowband light source is a red light source, and when the light source controller is in the white light operating mode, the current of the narrowband light source is controlled at 800-1000mA; and when the light source controller is in the monochromatic light operating mode, the current of the narrowband light source is controlled at 1500mA-2200mA; and (b) Projecting the broadband beam and / or the narrowband beam to a beam combiner, and then projecting it outward from the beam combiner; The illumination light provided by the light mixing and beam combining system allows the projection display system to select the appropriate color gamut display range of the mixed beam based on different display content. When the light source controller is in the white light working mode, the color gamut display range of the emitted light of the light mixing and beam combining system is less than 1%. When the light source controller is in the monochromatic light working mode, the color gamut display range of the emitted light of the light mixing and beam combining system is greater than 3%. Wherein, the difference between the spectral bandwidth of the broadband light source and the spectral bandwidth of the narrowband light source is greater than 150nm, the broadband light source is a white light LD light source; the narrowband light source is a monochromatic light LD light source, and the beam combining device is a color filter coated with a PS film layer.

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