Optical system and projection apparatus

Abstract

The invention discloses an optical system and projection equipment, and relates to the technical field of photoelectricity. According to the invention, the first lens unit repairs the wide-spectrum light beam in at least one of the two mutually perpendicular directions; the ratio of the light spot size of a wide-spectrum light beam incident to a second rectangular incident plane of the second dodging element in the first direction to the second direction is related to the ratio of the long side to the short side of the second rectangular incident plane, and the incident angle of the wide-spectrum light beam incident to the second rectangular incident plane corresponding to the first direction is smaller than that of the second direction. Meanwhile, the light spot shape of the light source light containing the narrow-spectrum light beam and the wide-spectrum light beam is adjusted to be rectangular through the second dodging element, so that the light spot shape is better matched with the incident plane of the display chip, and the lighting effect is improved; and the light spots of the wide-spectrum light beams incident on the second rectangular incident plane cover the light spots of the narrow-spectrum light beams, so that the uniformity of the brightness is improved while the display brightness is improved, and the display effect is improved.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic technology, and more particularly to an optical system and a projection device. Background Technology

[0002] In projection display products, the projection light source is a crucial component. Traditional bulbs are increasingly being phased out due to their inherent limitations. Newer light sources such as LEDs, laser phosphors, and laser light sources are gradually becoming the mainstream light sources for projection display systems, demonstrating superior characteristics in brightness, color, lifespan, and energy consumption. However, these three new light sources also have their own drawbacks: pure LED systems struggle to achieve high brightness and wide color gamut, and may result in a larger system size; while pure three-color laser light sources, although superior to LED systems in brightness and color gamut, suffer from speckle problems. This is because lasers have strong coherence, causing the viewer's eye to perceive numerous tiny particles on the screen, hindering the acquisition of ideal image quality.

[0003] Although some hybrid light source systems combining lasers and LEDs, or lasers and phosphors, have been proposed in the prior art, their performance still falls short of the ever-increasing demands for projected image quality. For example, Chinese patent CN117389106B discloses a projection light source that addresses the shortcomings of single-type projection light sources in affecting projected image quality, but its display effect still needs further improvement.

[0004] Meanwhile, existing technologies have proposed some light mixing schemes that improve brightness by mixing one color with another. For example, Chinese patent CN116828162B discloses a display system and display control method that uses a light mixing scheme in timing to achieve the mixing of narrow-spectrum and broadband light, resulting in a natural transition between grayscale and color levels. However, in this patent, when one color is mixed with another, the display timing changes. For example, mixing red light with green light results in a yellow light timing, and mixing green light with blue light results in a cyan light timing. In this case, the display timing changes from the previous three segments of red, green, and blue to five segments of red, yellow, green, cyan, and blue. This improves the display brightness to some extent, but it still cannot meet users' requirements for high-brightness display, and it may also lead to a small duty cycle for one or more colors of light, causing difficulties for chip control. Summary of the Invention

[0005] In view of this, the present invention provides an optical system and projection device that have higher display brightness and brightness uniformity compared to the hybrid light source systems in the prior art.

[0006] In a first aspect, the present invention provides an optical system, comprising a light source device, a second light-diffusing element, and a display chip, wherein...

[0007] The light source device is used to emit light from the light source, which includes narrow-spectrum beams and broad-spectrum beams.

[0008] The second homogenizing element is located between the light source device and the display chip, and is used to homogenize the incident light source light, adjusting the shape of the incident light source light spot to a rectangle, such that the long side of the rectangular light spot of the light source light incident on the third rectangular incident surface of the display chip is parallel to the long side of the third rectangular incident surface, wherein the light spot of the broadband beam incident on the second rectangular incident surface of the second homogenizing element covers the light spot of the narrow-spectrum beam.

[0009] The display chip is used to modulate the light source into image light;

[0010] The light source device includes:

[0011] Narrow-spectrum light source, used to emit narrow-spectrum light beams;

[0012] Broadband light source, used to emit broadband light beams;

[0013] The first lens unit is located in the optical path of the broadband beam emitted from the broadband light source. It is used to shape the incident broadband beam in at least one of the first and second directions, such that the ratio of the spot size of the broadband beam incident on the second rectangular incident surface in the first and second directions is related to the ratio of the long side and the short side of the second rectangular incident surface, and the incident angle of the broadband beam incident on the second rectangular incident surface in the first direction is smaller than that in the second direction, and the first direction is perpendicular to the second direction.

[0014] In one possible implementation, the narrow-spectrum light source emits a narrow-spectrum beam with a rectangular or elliptical spot; the light source device further includes:

[0015] The first homogenizing element is located in the optical path of the narrow-spectrum beam emitted from the narrow-spectrum light source. It is used to homogenize the narrow-spectrum beam and adjust the spot shape of the incident narrow-spectrum beam into a regular polygon or a rectangle with different lengths and widths. The long side of the spot of the narrow-spectrum beam incident on the first rectangular incident surface of the first homogenizing element is parallel to the long side of the first rectangular incident surface.

[0016] In one possible implementation, the light source device further includes:

[0017] The second lens unit is located in the optical path of the narrow-spectrum beam emitted from the first homogenizing element. It is used to reduce the divergence angle of the incident narrow-spectrum beam so that the spot size of the narrow-spectrum beam incident on the second rectangular incident surface is smaller than or equal to the second rectangular incident surface.

[0018] In one possible implementation, the distance between the second lens unit and the first light-diffusing element is greater than or equal to 0.1 mm and less than or equal to 10 mm.

[0019] In one possible implementation, the light source device further includes:

[0020] The third lens unit is located in the optical path of the narrow-spectrum beam emitted from the second lens unit and the broadband beam emitted from the first lens unit. It is used to collimate the incident beam so that the optical axes of the beams incident on the second rectangular incident surface coincide.

[0021] In one possible implementation, the broadband beam includes a first broadband light, the narrow-spectrum beam includes a first narrow-spectrum light, and the wavelength ranges of the first broadband light and the first narrow-spectrum light at least partially overlap; the light source device further includes:

[0022] A first beam combining element is used to guide at least a portion of a narrow-spectrum beam and at least a portion of a broadband beam to exit from the same direction and be incident on the second beam equalizing element, such that the energy of the narrow-spectrum beam exiting the first beam combining element accounts for at least 80% of the energy of the narrow-spectrum beam incident on the first beam combining element, and the energy of the broadband beam exiting the first beam combining element accounts for at least 40% of the energy of the broadband beam incident on the first beam combining element.

[0023] In one possible implementation, both the first broadband light and the first narrowband light are green, and the first beam combining element is used to transmit at least a portion of the narrowband light beam and reflect at least a portion of the broadband light beam, such that the energy of the first narrowband light emitted from the first beam combining element accounts for at least 90% of the energy of the first narrowband light incident on the first beam combining element, and the energy of the first broadband light emitted from the first beam combining element accounts for at least 45% of the energy of the first broadband light incident on the first beam combining element.

[0024] In one possible implementation, the broadband beam further includes a second broadband beam, and the narrow-spectrum beam further includes a second narrow-spectrum beam, wherein the wavelength ranges of the second broadband beam and the second narrow-spectrum beam at least partially overlap.

[0025] The first light combining element is further configured to ensure that the energy of the second narrow-spectrum light emitted by the first light combining element is at least 90% of the energy of the second spectral light incident on the first light combining element, and that the energy of the second broad-spectrum light emitted by the first light combining element is at least 70% of the energy of the second broad-spectrum light incident on the first light combining element.

[0026] In one possible implementation, both the second broadband light and the second narrowband light are red or blue.

[0027] In one possible implementation, the narrow-spectrum beam further includes a third narrow-spectrum beam, and the narrow-spectrum beam incident on the first optical combining element includes only one polarization state.

[0028] In one possible implementation, the broadband light source includes a green sub-light source and an excitation sub-light source, wherein,

[0029] The green sub-light source includes a first sub-light source and a wavelength conversion material, wherein the wavelength conversion material is used to generate a first green broadband light under the illumination of the first sub-light source;

[0030] The exciton light source is used to emit excitation light, which is used to irradiate the wavelength conversion material to generate a second green broadband light;

[0031] The first broadband light includes the first green broadband light and the second green broadband light.

[0032] In one possible implementation, the narrow-spectrum light source includes a first narrow-spectrum sub-light source and a first guiding component, wherein,

[0033] The first narrow-spectrum light source is used to emit a first beam with a rectangular or elliptical light spot;

[0034] The first guiding component is used to split the first beam emitted from the first narrow spectrum light source into a first narrow spectrum beam and a second narrow spectrum beam with rectangular or elliptical light spots.

[0035] The light spots of the first narrow-spectrum sub-beam and the second narrow-spectrum sub-beam emitted from the narrow-spectrum light source are arranged side by side, and the long side of the light spot of the narrow-spectrum beam is equal to the longer of the long side of the first narrow-spectrum beam and the second narrow-spectrum beam. The short side of the light spot of the narrow-spectrum beam is greater than or equal to the longer of the short side of the first narrow-spectrum beam and the second narrow-spectrum beam and the factor a, where a = 5 mm.

[0036] In one possible implementation, the narrow-spectrum light source includes a second narrow-spectrum sub-light source and a third narrow-spectrum light source, wherein the second narrow-spectrum light source and the third narrow-spectrum light source are two independent devices.

[0037] The second narrow-spectrum light source is used to emit a first narrow-spectrum beam with a rectangular or elliptical light spot;

[0038] The third narrow-spectrum light source is used to emit a second narrow-spectrum beam with a rectangular or elliptical light spot;

[0039] The light spots of the first narrow-spectrum sub-beam and the second narrow-spectrum sub-beam emitted from the narrow-spectrum light source are arranged side by side, and the long side of the light spot of the narrow-spectrum beam is equal to the longer of the long side of the first narrow-spectrum beam and the second narrow-spectrum beam. The short side of the light spot of the narrow-spectrum beam is greater than or equal to the longer of the short side of the first narrow-spectrum beam and the second narrow-spectrum beam and the factor a, where a = 5 mm.

[0040] In one possible implementation, the broadband beam further includes a second broadband beam, and / or the narrow beam further includes a second narrow beam, wherein the first broadband beam and the first narrow beam both have a first color, and the second broadband beam and the second narrow beam both have a second color;

[0041] One lighting cycle of the light source device includes a first time period and a second time period, wherein the first time period is used to emit light of the second color and the second time period is used to emit light of the first color.

[0042] The light source device is used to emit a second narrow-spectrum light and / or a second broad-spectrum light in the first time period, emit a first narrow-spectrum light and / or a first broad-spectrum light in the second time period, and emit a second narrow-spectrum light and / or a second broad-spectrum light in at least a portion of the second time period.

[0043] In one possible implementation, the second homogenizing element includes a second compound eye lens.

[0044] In one possible implementation, the light source device further includes:

[0045] A dynamic diffusion element is located in the optical path of the narrow-spectrum beam emitted from the narrow-spectrum light source. The maximum current limiting value for driving the dynamic diffusion element is between 200mA and 400mA. The vibration frequency of the dynamic diffusion element in the fifth and sixth directions is 50Hz, 60Hz, 70Hz, or 80Hz. The fifth and sixth directions are perpendicular to each other.

[0046] When the vibration frequency of the dynamic diffusion element in both the fifth and sixth directions is 50 Hz, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 5% and 10%, and the duty cycle of the current used to drive the dynamic diffusion element in the sixth direction is between 4% and 10%.

[0047] When the vibration frequency of the dynamic diffusion element in both the fifth and sixth directions is 60 Hz, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 3% and 10%, and the duty cycle of the current used to drive the dynamic diffusion element in the sixth direction is between 5% and 10%.

[0048] When the vibration frequency of the dynamic diffusion element in both the fifth and sixth directions is 70 Hz, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 10% and 20%, and the duty cycle of the current used to drive the dynamic diffusion element in the sixth direction is between 13% and 30%.

[0049] When the vibration frequency of the dynamic diffusion element in both the fifth and sixth directions is 80 Hz, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 18% and 40%, and the duty cycle of the current used to drive the dynamic diffusion element in the sixth direction is between 22% and 60%.

[0050] In a second aspect, the present invention provides a projection device including the optical system described in the first aspect.

[0051] This invention modifies the broadband beam in at least one of two mutually perpendicular directions using a first lens unit. This results in the ratio of the broadband beam spot size incident on the second rectangular incident surface of the second homogenizing element to the ratio of the long side to the short side of the second rectangular incident surface. Furthermore, the incident angle of the broadband beam incident on the second rectangular incident surface in the first direction is smaller than that in the second direction, thus improving the utilization rate of the broadband beam generated by the broadband light source. Simultaneously, the second homogenizing element adjusts the spot shape of the light source light containing both narrow-spectrum and broadband beams to a rectangle, making it more compatible with the incident surface of the display chip and improving luminous efficiency. Moreover, the spot of the broadband beam incident on the second rectangular incident surface covers the spot of the narrow-spectrum beam, improving both display brightness and brightness uniformity, thereby enhancing the display effect. Attached Figure Description

[0052] Figure 1 This is a schematic diagram of the functional modules of a projection device provided in an embodiment of the present invention;

[0053] Figure 2 This is a schematic diagram of the structure of a projection device provided in an embodiment of the present invention;

[0054] Figures 3-7 A timing diagram of the display cycle provided in an embodiment of the present invention;

[0055] Figure 8 This is a schematic diagram of the structure of a light source device provided in an embodiment of the present invention;

[0056] Figures 9-12 This is a schematic diagram of the beam spot of a narrow-spectrum beam provided in an embodiment of the present invention;

[0057] Figures 13-15 This is a schematic diagram of the narrow-spectrum light source provided in an embodiment of the present invention;

[0058] Figure 16 This is a schematic diagram of a light source device provided in an embodiment of the present invention. Detailed Implementation

[0059] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions in the embodiments of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this invention and are not intended to limit this invention. Although the disclosure in this invention is presented according to one or several exemplary examples, it should be understood that each aspect of these disclosures can constitute a complete technical solution on its own. Without conflict, the following embodiments and features described herein can be combined with each other.

[0060] In this invention, to facilitate a clear description of the technical solutions of the embodiments of the invention, the terms "first" and "second" are used to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order; they are merely illustrative and descriptive of the objects, without any order, and do not indicate a specific limitation on the number of devices or messages in the embodiments of the invention, nor do they constitute any limitation on the embodiments of the invention. "Multiple" refers to two or more, and words such as "including" or "comprising" mean that the element or object preceding the word covers the element or object listed after the word and its equivalents, without excluding other elements or objects.

[0061] To fully understand the present invention, a detailed description is provided below to illustrate the technical solutions of the invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0062] Figure 1 This is a schematic diagram of the functional modules of a projection device provided in an embodiment of the present invention. Figure 1 As shown, the projection device includes an image processor 110 and a projection optical engine 120. Wherein:

[0063] The image processor 110 can be a microcontroller, a dedicated image processing chip, etc. The microcontroller can be an ARM chip, a microcontroller unit (MCU), etc.; the dedicated image processing chip can be an image signal processor (ISP), a graphics processing unit (GPU), an embedded neural network processing unit (NPU), etc. The image processor 110 can be used for video decoding, image quality processing, etc.

[0064] The projection optical engine 120 may include a driver chip, a display chip, and a light source. The light source may include a laser light source, an LED light source, a fluorescent light source, etc.; the display chip may be a digital micromirror device (DMD), a liquid crystal display (LCD), or a liquid crystal on silicon (LCOS), used to modulate the light from the light source to generate image light; the driver chip corresponds to the display chip, for example, the digital micromirror device may be driven by a digital light processing (DLP) element. The projection optical engine 120 is used to project the image to be projected into a projected image.

[0065] In some embodiments, the projection device further includes a central controller 130 with one or more processing cores, which may be a CPU, ARM, MCU, or other controller. The central controller 130 is the control center of the projection device, connecting various parts of the entire projection device via various interfaces and lines. It can run or execute software programs and / or operating systems stored in the storage module 140, and access data stored in the storage module 140. Optionally, the image processor 110 and the central controller 130 may be integrated into a single processor.

[0066] In some embodiments, the projection device further includes components such as a storage module 140, an input module 150, and a communication module 160, which are computer-readable storage media. Those skilled in the art will understand that... Figure 1 The projection device structure shown does not constitute a limitation on the projection device and may include more or fewer components than shown, or combine certain components, or have different component arrangements. Wherein:

[0067] Storage module 140 can be used to store software programs and operating systems. Central controller 130 executes various functional applications and data processing by running the software programs and operating systems stored in storage module 140. Storage module 140 may primarily include a program storage area and a data storage area. The program storage area may store the operating system, at least one application program required for a function (such as sound playback, image playback, etc.), etc.; the data storage area may store data created based on the use of the projection device, etc. Furthermore, storage module 140 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, storage module 140 may also include a memory controller to provide central controller 130 with access to storage module 140.

[0068] The projection device may also include an input module 150, which can be used to receive input digital or character information, and generate remote control, keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control.

[0069] The projection device may also include a communication module 160. In some embodiments, the communication module 160 may include a wireless module, through which the projection device can perform short-range wireless transmission, thereby providing users with wireless broadband internet access. For example, the communication module 160 can be used to help users access streaming media.

[0070] Figure 2 This is a schematic diagram of the structure of a projection device provided in an embodiment of the present invention. Figure 2 As shown, the projection device includes a light source device 210, an illumination system 220, and an imaging system 230. The light source light generated by the light source device 210 is homogenized by a light-homing element (not shown). The illumination system 220 images the light spot emitted from the light-homing element onto a display chip (not shown). The display chip modulates the incident light source light into image light, which then illuminates the imaging system 230. Finally, the image light is imaged onto a projection plane such as a screen to form a projected image. The light-homing element includes an incident surface and an exit surface. The light-homing element is used to homogenize the light source light incident from its incident surface. For example, the light-homing element can be a light bar, a compound eye, etc.

[0071] In addition, the projection device may also include a light source control module (not shown in the figure), which can control the operation of one or more light sources in the light source device 210 so that the light source device 210 emits light of a specified wavelength required for generating an image. Furthermore, the light source device 210, the illumination system 220, and the imaging system 230 can all be included in the projection optical engine 120 (see reference 120). Figure 1 )middle.

[0072] The light source device 210 may include a narrow-spectrum light source and / or a broadband light source, and may contain one or more of these sources. The narrow-spectrum light source may be a laser light source, a lasing light source, etc., while the broadband light source may be an LED light source, a fluorescent light source, etc. Furthermore, the light source may be a single light-emitting element or an array of light-emitting elements, and the array of light-emitting elements may include light-emitting elements of different colors. For example, the light source may be an LD light source or an LED light source that generates blue, green, or red light, or the light source may be a multi-color laser, i.e., an array of light-emitting elements containing multiple lasers. For example, the light source may contain blue and red lasers, or blue and green lasers, or simultaneously blue, red, and green lasers.

[0073] In some embodiments, the light source generated by the light source device 210 includes at least a first light, a second light, and a third light. The first light, the second light, and the third light each include at least one narrow-spectrum light and one broad-spectrum light. The first light has a first color, the second light has a second color, and the third light has a third color. The first color and the second color are different, and the third color is different from both the first and second colors or the same as one of the first and second colors. For example, the first light may include a first narrow-spectrum light and / or a first broad-spectrum light, the second light may include a second narrow-spectrum light and / or a second broad-spectrum light, and the third light may include a third narrow-spectrum light and / or a third broad-spectrum light. For instance, the first light may include green laser light and / or green LED light, the second light may include red laser light and / or red LED light, and the third light may include blue laser light, blue LED light, green LED light, or red laser light, etc. It should be understood that in some other embodiments, the color of the first light may also be red or blue, and the color of the second light may also be blue or green, etc. By mixing narrow-spectrum light and broad-spectrum light, the advantages of both can be simultaneously utilized, improving the display effect.

[0074] The lighting system 220 is used to image the light spot emitted from the light source device onto the display chip. In some embodiments, the lighting system may include one or more lenses.

[0075] Imaging system 230 is used to image light onto a projection plane such as a screen to form a projected image. Imaging system 230 is generally a lens system, such as a projection lens.

[0076] Figures 3-7 This is a timing diagram illustrating a display cycle provided in an embodiment of the present invention. In some embodiments, a display cycle includes a first time period and a second time period, wherein the first time period is used to display an image corresponding to a second color, and the second time period is used to display an image corresponding to a first color, such as... Figures 3-4As shown. In some embodiments, a display cycle includes a first time period, a second time period, and a third time period. The first time period is used to display an image corresponding to a second color, the second time period is used to display an image corresponding to a first color, and the third time period is used to display an image corresponding to a third color, as shown. Figures 5-6 As shown. In some embodiments, a display cycle includes a first time period, a second time period, a third time period, a fourth time period, and a fifth time period. The first time period is used to display an image corresponding to a second color, the second time period is used to display an image corresponding to a first color, the third time period is used to display an image corresponding to a third color, the fourth time period is used to display an image corresponding to a fourth color, and the fifth time period is used to display an image corresponding to a fifth color. The fourth color can be obtained by mixing the second color and the first color, and the fifth color can be obtained by mixing the first color and the third color. In this embodiment, the first color, the second color, and the third color are all different. Figure 7 As shown. In some other embodiments, a display cycle may also include one time period, four time periods, or other numbers of time periods, as long as the display requirements are met. It should be understood that one display cycle of the projection device corresponds to one lighting cycle of the light source device. The first time period is used to display the image corresponding to the second color, that is, the light source device emits light of the second color in the first time period, and so on.

[0077] It should be noted that a projection device may support only one timing sequence, or it may support two or more timing sequences simultaneously. Each timing sequence corresponds to a display mode, thereby meeting different scenario requirements and improving the user experience.

[0078] Please see Figures 3-4 A display cycle includes a first time period and a second time period. The light source device emits a second light of a second color during the first time period, emits a first light of a first color during the second time period, and emits a second light of a second color during at least a portion of the second time period. Because the first light of the first color and the second light of the second color are emitted during the second time period for displaying an image corresponding to the first color, the display brightness is improved. Furthermore, because the second light is interspersed in the timing of the first light, it can supplement the second light, thus solving the problem of chip control difficulties caused by the small duty cycle of one or more colors of light.

[0079] The driving current of the second light emitted by the light source device in the first time period and the second time period may be the same or different. The types of the second light emitted by the light source device in the first time period and the second time period may be the same or different. For example, the second light emitted by the light source device in the first time period may be narrow-spectrum light and the second light emitted in the second time period may be broadband light. Or, the second light emitted by the light source device in the first time period may be broadband light and the second light emitted in the second time period may also be broadband light. Or, the second light emitted by the light source device in the first time period may include both narrow-spectrum light and broadband light and the second light emitted in the second time period may be either narrow-spectrum light or broadband light. Or, the second light emitted by the light source device in the first time period may include both narrow-spectrum light and broadband light and the second light emitted in the second time period may also include both narrow-spectrum light and broadband light. Preferably, when the type of second light emitted by the light source device in the first and second time periods is the same, the driving current of the second light emitted by the light source device in the second time period is less than that in the first time period, or / and the duration of the second light emitted by the light source device in the second time period is appropriately reduced. For example, if the second light emitted by the light source device in both the first and second time periods is narrow-spectrum light, the driving current of the second light emitted by the light source device in the second time period can be reduced, or / and the second light can be emitted only in part of the second time period, thereby improving the system brightness while minimizing the impact on the color gamut of the first light. In this embodiment of the invention, it is preferable that the light source device emits the second light throughout the entire second time period, reducing the difficulty of light source control.

[0080] Optionally, the light emitted by the light source device includes at least two narrow-spectrum lights, such as a first narrow-spectrum light and a second narrow-spectrum light, or a first narrow-spectrum light and a third narrow-spectrum light, or a first narrow-spectrum light, a second narrow-spectrum light and a third narrow-spectrum light. In this embodiment, the driving current of the first narrow-spectrum light can be less than that of other colors of narrow-spectrum light. In this embodiment, the first narrow-spectrum light is preferably green light, so as to achieve a balance between comprehensive performance such as brightness and color gamut.

[0081] Preferably, the first color is green. Mixing other colors, such as red, blue, or yellow, into the green light period can more effectively enhance brightness. Furthermore, the second color is preferably red, which can both enhance brightness and achieve better white balance.

[0082] Please see Figures 5-6 A display cycle includes a first time period, a second time period, and a third time period, also known as a three-segment time sequence. In this embodiment, the third color is different from both the first and second colors; for example, the first color is green, the second color is red, and the third color is blue. In some embodiments, the light source device emits a first light of the first color and a second light of the second color simultaneously during the second time period, such as... Figure 5 As shown. In some embodiments, the light source device emits a first light of a first color and a third light of a third color simultaneously during the second time period, such as... Figure 6As shown. It should be understood that in some other embodiments, the light source device emits a first light of a first color, a second light of a second color, and a third light of a third color simultaneously during the second time period. Other controls in this embodiment... Figures 3-4 The same applies, so I won't go into detail here.

[0083] Please see Figure 7 A display cycle consists of five time segments: a first time segment, a second time segment, a third time segment, a fourth time segment, and a fifth time segment. Figures 5-6 The difference lies in that a display cycle also includes a fourth period where light of the first and second colors is emitted simultaneously, and a fifth period where light of the first and third colors is emitted simultaneously. Although both the fourth and second periods emit light of the first and second colors simultaneously, these two periods are fundamentally different. The fourth period is for the fourth color, while the second period is for the first color. Similarly, the fifth period... Figure 6 The second time period in the illustrated embodiment also has a fundamental difference. Optionally, the intensity of the second light emitted by the light source device in the second time period may be less than that in the fourth time period and / or the first time period (e.g., the driving current of the second light emitted by the light source device in the second time period may be less than that in the fourth time period and / or the first time period), while the intensity of the second light emitted by the light source device in the first time period and the fourth time period may be the same or different, or the intensity of the first light emitted by the light source device in the second time period may be greater than that in the fourth time period, thereby reducing the impact on the color gamut of the first light.

[0084] In some embodiments, when the light source device does not emit the second light in the second time period, the first time period accounts for the largest proportion of the entire display cycle. Taking a five-segment time sequence as an example, the first time period accounts for 37%, the second time period accounts for 8%, the third time period accounts for 25%, and the other time periods account for a total of 30% (e.g., the fourth time period accounts for 19%, and the fifth time period accounts for 11%). The second time period accounts for a relatively small proportion, making chip control difficult. If the proportion of the second time period is increased by reducing the current, it will lead to a decrease in brightness. When the light source device emits the second light in the second time period, it is not necessary to increase the proportion of the second time period by reducing the current, which reduces the difficulty of chip control and can also increase brightness. Furthermore, the second time period can account for the largest proportion of the entire display cycle, such as the first time period accounting for 22%, the second time period accounting for 28%, the third time period accounting for 20%, the fourth time period accounting for 19%, and the fifth time period accounting for 11% of a display cycle. This ensures that even when the second light is emitted in the second time period, the displayed image can still meet the target white balance conditions.

[0085] Figure 8 This is a schematic diagram of a light source device provided in an embodiment of the present invention. Figure 8As shown, the light source device includes a narrow-spectrum light source 100 and a broadband light source 200. Further, the light source device may also include a first beam combining element 301. The narrow-spectrum beam emitted from the narrow-spectrum light source 100 and the broadband beam emitted from the broadband light source 200 are guided by the first beam combining element 301 to be emitted from the same direction, forming light from the light source. Optionally, the spot of the broadband beam emitted from the first beam combining element 301 covers the spot of the narrow-spectrum beam, such that the spot of the narrow-spectrum beam is within the coverage area of ​​the broadband beam spot, preferably the spot of the narrow-spectrum beam is located at the center of the broadband beam spot, further improving the uniformity of the light. It should be understood that the narrow-spectrum beam emitted from the narrow-spectrum light source 100 and the broadband beam emitted from the broadband light source 200 may also be emitted from the same direction without being combined by a beam combining element, but rather through other means such as the placement of the narrow-spectrum light source 100 and the broadband light source 200.

[0086] Narrow-spectrum light source 100 is used to emit a narrow-spectrum light beam. The narrow-spectrum light source 100 may include one or more independent light-emitting devices, each of which may include one or more emitters for emitting narrow-spectrum light. For example, a light-emitting device may include only a single emitter or an array of emitters, and the emitter array may include emitters of a single color or different colors. For instance, a light-emitting device may have at least two rows of emitters, each row containing multiple emitters, and the number of emitters in each row may be the same or different. For example, a light-emitting device may have one row of red emitters and one row of emitters mixed with blue and green emitters; or, for example, a light-emitting device may have one row of red emitters, one row of blue emitters, and one row of green emitters. When a light-emitting device includes an emitter array, the spot of its emitted narrow-spectrum light beam is composed of the spots of multiple emitters, thus forming a rectangular or elliptical spot. Figure 9 A schematic diagram of the light spot of a narrow-spectrum beam emitted by a series of light emitters is shown. Furthermore, the red light emitter on the light-emitting device is closer to the light-emitting side of the narrow-spectrum light source than the emitters of other colors (such as blue and green), resulting in a shorter optical path for red light compared to other colors. Since the divergence angle of red light is larger than that of other colors, the red light spot is typically larger than the blue-green light spot. This makes the spot sizes of each color light in the narrow-spectrum beam emitted by the narrow-spectrum light source 100 more similar, improving luminous efficiency and light uniformity.

[0087] Alternatively, please refer to Figures 10-12The narrow-spectrum light source 100 emits a narrow-spectrum beam with a rectangular or elliptical spot. This narrow-spectrum beam includes a first narrow-spectrum sub-beam and a second narrow-spectrum beam, both with rectangular or elliptical spots. The spots of the first and second narrow-spectrum beams can completely overlap (complete overlap when they are the same size, and the larger spot covering the smaller spot when they are different sizes) or partially overlap, and may also have a certain gap. Preferably, the spots of the first and second narrow-spectrum beams partially overlap or have a certain gap, increasing the spot area and facilitating spot dispersion. For example, the light spots of the first and second narrow-spectrum sub-beams emitted from the narrow-spectrum light source 100 are arranged side by side. The long side of the light spot of the narrow-spectrum beam is equal to the longer of the long side of the first and second narrow-spectrum beams. The short side of the light spot of the narrow-spectrum beam is greater than the longer of the short side of the first and second narrow-spectrum beams but less than or equal to the sum of the short side of the first and second narrow-spectrum beams and a factor a, where a = 5 mm. This increases the light spot area and helps avoid interference caused by components being too close together, as well as production process limitations caused by excessively large die-cast body dimensions. It also reduces assembly difficulty and improves yield. Furthermore, the first and second narrow-spectrum beams can contain the same or different colors of light. Preferably, they contain the same colors of light, which can improve light uniformity and help eliminate speckle.

[0088] In some embodiments, the narrow-spectrum light source 100 includes a first narrow-spectrum sub-light source and a first guiding component. The first narrow-spectrum light source is used to emit a first beam with a rectangular or elliptical light spot; the first guiding component is used to split the first beam emitted by the first narrow-spectrum light source into a first narrow-spectrum sub-beam and a second narrow-spectrum sub-beam. In this embodiment, the narrow-spectrum light source 100 includes only one light-emitting device, and the guiding component is used to split the emitted beam into two sub-beams, thus saving costs.

[0089] For example, such as Figure 13 As shown, the first narrow-spectrum light source has two rows of emitters. The row of emitters closer to the narrow-spectrum light source emits a red light beam, and the row of emitters farther away from the narrow-spectrum light beam emits a blue-green light beam. The first beam includes the red light beam and the blue-green light beam. The first guiding component includes a reflector 101, a semi-transparent and semi-reflective element 102, and a reflector 103. The blue-green light beam is reflected by the reflector 101 to the semi-transparent and semi-reflective element 102. A portion of the blue-green light beam is transmitted through the semi-transparent and semi-reflective element 102, and another portion is reflected by the semi-transparent and semi-reflective element 102 to the reflector 103. The red light beam is directly incident on the semi-transparent and semi-reflective element 102. A portion of the red light beam is reflected by the semi-transparent and semi-reflective element 102 and combines with the portion of the blue-green light beam transmitted through the semi-transparent and semi-reflective element 102 to form the first narrow-spectrum beam. The other portion of the red light beam is transmitted through the semi-transparent and semi-reflective element 102 to the reflector 103, where it combines with the portion of the blue-green light beam reflected by the semi-transparent and semi-reflective element 102 to form the second narrow-spectrum beam.

[0090] In some other embodiments, the narrow-spectrum light source 100 includes a second narrow-spectrum light source and a third narrow-spectrum light source, which are two independent devices. The second narrow-spectrum light source is used to emit a first narrow-spectrum beam, and the third narrow-spectrum light source is used to emit a second narrow-spectrum beam. In this embodiment, the narrow-spectrum light source 100 includes two light-emitting devices, enabling high-brightness display.

[0091] Optionally, the long sides of the second and third narrow-spectrum light sources are parallel to each other, such as... Figures 14-15 As shown, the dots and double arrows indicate the polarization direction. The narrow-spectrum light source 100 also includes a second guiding component, which guides the first narrow-spectrum beam emitted from the second narrow-spectrum light source and the second narrow-spectrum beam emitted from the third narrow-spectrum light source to emerge from the same direction to form a narrow-spectrum beam. The short side of the spot of the narrow-spectrum beam emitted from the narrow-spectrum light source 100 is equal to the sum of the short sides of the spots of the first and second narrow-spectrum beams and a non-negative number b, where b ≤ 3 mm. By using the guiding component to reduce the spacing between the spots of the first and second narrow-spectrum beams, the size of subsequent optical elements can be reduced, thereby reducing the system volume.

[0092] Preferably, such as Figure 14 As shown, the second and third narrow-spectrum light sources are arranged facing each other, and the long sides of both the second and third narrow-spectrum light sources are parallel to the optical axis of the narrow-spectrum beam emitted from the narrow-spectrum light source 100. Both the second and third narrow-spectrum light sources have at least two rows of emitters arranged in a third direction, and each row of emitters has multiple emitters arranged along a fourth direction. The long side of the narrow-spectrum beam spot is related to the length of each row of emitters in the fourth direction, where the third direction corresponds to the long side of the second and third narrow-spectrum light sources, and the fourth direction corresponds to the short side of the second and third narrow-spectrum light sources. In this embodiment, the spacing between the spots of the first and second narrow-spectrum beams can reach 3mm or 2mm, or even smaller. The spacing between the spots of the first and second narrow-spectrum beams can be further reduced by adjusting the position of the light-emitting devices, thus reducing the system volume.

[0093] In the following embodiments, the first narrow-spectrum beam and the second narrow-spectrum beam contain the same color of light, and both the first narrow-spectrum beam and the second narrow-spectrum beam contain at least the first narrow-spectrum light, as an example for illustration.

[0094] The broadband light source 200 is used to emit a broadband light beam, which includes a first broadband light. The broadband light source 200 may include one or more independent light-emitting devices, each of which may include one or more emitters for emitting broadband light. For example, a light-emitting device may include only a single emitter or include an array of emitters, and the array of emitters may include emitters of a single color or different colors.

[0095] The first beam combining element 301 is used to guide at least a portion of the broadband beam and at least a portion of the narrow-spectrum beam outward from the same direction. Optionally, the spot of the broadband beam outward from the first beam combining element 301 covers the spot of the narrow-spectrum beam, improving the uniformity of the combined beam. The first beam combining element 301 may be a mirror with an aperture (the narrow-spectrum beam is transmitted through the aperture area, and the broadband beam is reflected through the mirror area), or a small mirror (the narrow-spectrum beam is reflected through the mirror area, and the broadband beam is transmitted through the area surrounding the mirror), or a coated dichroic element (one beam is transmitted while the other is reflected due to the coating properties), etc.

[0096] In some embodiments, the wavelength ranges of the first broadband light and the first narrowband light overlap at least partially. For example, the first narrowband light is a green laser, and the first broadband light is a green fluorescent light, a green LED light, or a yellow fluorescent light. Or, the first narrowband light is a red laser, and the first broadband light is a red LED light, a red fluorescent light, or a yellow fluorescent light. Or, the first narrowband light is a blue laser, and the first broadband light is a blue LED light, a blue fluorescent light, or a cyan fluorescent light. By mixing the narrowband light and the broadband light, the advantages of both can be combined, thus improving the display effect. Since the wavelength ranges of the first broadband light and the first narrowband light overlap at least partially, light loss usually occurs when wavelength combining occurs through the first light combining element 301. In this embodiment, the first light combining element 301 is used to ensure that the energy of the narrowband beam emitted from the first light combining element 301 accounts for at least 80% of the energy of the narrowband beam incident on the first light combining element 301, and the energy of the broadband beam emitted from the first light combining element 301 accounts for at least 40% of the energy of the broadband beam incident on the first light combining element 301. For example, the transmittance of the narrowband beam is about 85%, and the reflectance of the broadband beam is about 45%; or the transmittance of the narrowband beam is about 90%, and the reflectance of the broadband beam is about 50%. By comprehensively considering the characteristics of the narrowband beam and the broadband beam, the light combining efficiency is improved, the speckle effect is reduced, and the display effect is enhanced. Furthermore, polarization elements such as half-wave plates can be used to ensure that the narrowband beam incident on the first light combining element 301 includes only one polarization state (preferably the P polarization state), further improving the light combining effect.

[0097] For example, if the colors of the first broadband light and the first narrowband light are both green (including yellow-green), then through the coating characteristics, the energy of the first narrowband light emitted by the first light combining element 301 can be at least 90% of the energy of the first narrowband light incident on the first light combining element 301, and the energy of the first broadband light emitted by the first light combining element 301 can be at least 45% of the energy of the first broadband light incident on the first light combining element 301, such as the transmittance of the first narrowband light being about 92% and the reflectance of the first broadband light being about 48% or 60%. If the colors of the first broadband light and the first narrowband light are red, blue, or other colors, then through the coating characteristics, the energy of the first narrowband light emitted from the first light combining element 301 can be at least 90% of the energy of the first narrowband light incident on the first light combining element 301, and the energy of the first broadband light emitted from the first light combining element 301 can be at least 70% of the energy of the first broadband light incident on the first light combining element 301. For example, the transmittance of the first narrowband light is about 90%, and the reflectance of the first broadband light is about 72% or 80%. This further enhances the light combining effect.

[0098] It should be noted that both broadband and narrowband beams can include light of multiple colors. For example, a broadband beam may also include a second broadband light, and a narrowband beam may also include a second narrowband light. Both the second broadband and narrowband lights have a second color, which is different from the first color of the first broadband and first narrowband lights. For example, the first color may be green, and the second color may be red, blue, or yellow. Furthermore, a narrowband beam may also include a third narrowband light, which has a third color, such as green as the first color and blue or red as the third color. Optionally, a broadband beam may also include a third broadband light with a third color. In a preferred embodiment, the narrowband beam simultaneously includes a green first narrowband light, a red second narrowband light, and a blue third narrowband light, and the broadband beam includes a green first broadband light, or simultaneously includes a green first broadband light and a red second broadband light. Using three-color narrowband light achieves high brightness display.

[0099] The narrow-spectrum light source 100 and the broadband light source 200 of the light source device can emit beams simultaneously, achieving light mixing of narrow-spectrum and broadband light. Alternatively, the narrow-spectrum light source 100 and the broadband light source 200 can emit beams individually; that is, at any given time, only the narrow-spectrum light source 100 emits a narrow-spectrum beam, or only the broadband light source 200 emits a broadband beam, to meet different user needs. For example, the projection device can be set with multiple display modes, such as a first display mode and a second display mode. The projection device can automatically select a display mode based on the target display content, display environment, and other conditions. Alternatively, the mode selection option can be displayed on the interface for the user to choose from. Once the display mode is determined, the corresponding light source in the light source device is controlled to emit a beam. For example, if the display mode is determined to be the first display mode, both the narrow-spectrum light source 100 and the broadband light source 200 of the light source device are controlled to emit beams simultaneously. If the display mode is determined to be the second display mode, only the narrow-spectrum light source 100 of the light source device emits a beam. Optionally, the projection device can also be set with a third display mode. When the third display mode is determined, the broadband light source 200 of the light source device is controlled to emit a beam. It should be understood that regardless of the display mode selected, a second light can be added during the second period of the first light emission.

[0100] Continue reading Figure 8 The light source device may further include a first lens unit 302 and a second homogenizing element 303. The first lens unit 302 is located in the optical path of the broadband beam emitted from the broadband light source 200 and is used to shape the incident broadband beam in at least one of the first and second directions. This is achieved by the ratio of the spot size of the broadband beam incident on the second rectangular incident surface of the second homogenizing element 303 in the first and second directions being related to the ratio of the long side to the short side of the second rectangular incident surface. Furthermore, the incident angle of the broadband beam incident on the second rectangular incident surface corresponding to the first direction is smaller than that in the second direction, and the first direction is perpendicular to the second direction. In this embodiment, the first lens unit 302 is used to shape the broadband beam, ensuring that the spot size and incident angle of the broadband beam incident on the second homogenizing element 303 meet preset conditions. This improves the utilization rate of the broadband beam generated by the broadband light source, increases light collection efficiency, and thus enhances display brightness. It should be noted that the ratio of the spot size of the broadband beam in the first direction and the second direction is related to the ratio of the long side and the short side of the second rectangular incident surface. It can be that the ratio of the spot size in the first direction and the second direction is proportional to the ratio of the long side and the short side of the second rectangular incident surface.

[0101] The second homogenizing element 303 is located in the optical path of the beam emitted from the first combining element 301 and is used to homogenize the beam incident on the second rectangular incident surface of the second homogenizing element 303. In some embodiments, the second homogenizing element 303 is used to adjust the spot shape of the incident light source light to a rectangle, such that the long side of the rectangular spot of the light source light incident on the third rectangular incident surface of the display chip is parallel to the long side of the third rectangular incident surface. The spot of the broadband beam incident on the second rectangular incident surface of the second homogenizing element covers the spot of the narrow-spectrum beam, improving both display brightness and brightness uniformity, thereby enhancing the display effect. By adjusting the spot shape of the light source light containing both narrow-spectrum and broadband beams to a rectangle using the second homogenizing element, it better matches the incident surface of the display chip, improving light efficiency. Preferably, the second homogenizing element 303 includes a second compound eye lens. Using a compound eye lens to homogenize the light source light containing broadband beams can reduce the use of beam-shrinking lenses and reduce the system size. Furthermore, the interface of the compound eye unit of the second compound eye lens can be rectangular. The ratio of the spot size of the broadband beam incident on the second rectangular incident surface of the second homogenizing element 303 in the first direction and the second direction is related to the ratio of the long side and the short side of the compound eye unit, thereby improving the light collection efficiency. It should be noted that the ratio of the spot size of the broadband beam in the first direction and the second direction, which is related to the ratio of the long side and the short side of the compound eye unit, can be inversely proportional to the ratio of the long side and the short side of the compound eye unit.

[0102] It should be understood that the first lens unit 302 may include one or more lenses, and the incident surface of the second light-diffusing element 303 may also be a shape other than a rectangle, such as a hexagon, trapezoid, or circle. The embodiments of the present invention do not impose any restrictions on this.

[0103] To better understand the present invention, the light source device is described in detail below with reference to a specific embodiment. In this specific embodiment, the narrow-spectrum light source 100 emits a narrow-spectrum beam comprising red, green, and blue laser light, and the broadband light source 200 emits a broadband beam comprising at least green light.

[0104] Figure 16 This is a schematic diagram of a light source device provided in an embodiment of the present invention. Figure 16 As shown, the light source device includes a narrow-spectrum light source 100, a broadband light source 200, a first beam combining element 301, a first lens unit 302, and a second beam homogenizing element 303. The broadband beam emitted from the broadband light source 200 is shaped by the first lens unit 302 and combined with the narrow-spectrum beam emitted from the narrow-spectrum light source 100 at the first beam combining element 301, and then incident on the second beam homogenizing element 303.

[0105] In some embodiments, the light source device further includes a first homogenizing element 304 located on the optical path of the narrow-spectrum beam emitted from the narrow-spectrum light source 100, used to homogenize the narrow-spectrum beam, adjusting the spot shape of the incident narrow-spectrum beam to a regular polygon or a rectangle with unequal length and width. Using two homogenizing elements to homogenize the narrow-spectrum beam further reduces the speckle effect. If the narrow-spectrum beam emitted from the narrow-spectrum light source 100 has a rectangular or elliptical spot, the long side of the spot of the narrow-spectrum beam incident on the first rectangular incident surface of the first homogenizing element 304 is parallel to the long side of its first rectangular incident surface, improving luminous efficiency and reducing system volume. Further, the optical axis of the narrow-spectrum beam incident on the first rectangular incident surface of the first homogenizing element 304 coincides with the central axis of its first rectangular incident surface, and the spots of the first and second narrow-spectrum beams emitted from the narrow-spectrum light source 100 are symmetrical about the optical axis, improving light uniformity. The first homogenizing element 304 can be a compound eye lens or a light bar, preferably a compound eye lens.

[0106] Optionally, a second lens unit 305 is further provided in the optical path of the narrow-spectrum beam emitted from the first homogenizing element 301 to reduce the divergence angle of the incident narrow-spectrum beam. This ensures that the spot size of the narrow-spectrum beam incident on the second rectangular incident surface of the second homogenizing element 303 is smaller than or equal to the second rectangular incident surface. The first homogenizing element 301 and the second lens unit 305 homogenize, shape, and converge the narrow-spectrum beam, thereby improving uniformity and suppressing speckle. In this embodiment, the distance between the second lens unit 305 and the first homogenizing element 301 is greater than or equal to 0.1 mm and less than or equal to 10 mm, such as 0.2 mm, 0.5 mm, 3 mm, or 5 mm, to ensure the beam-converging effect. It should be understood that the second lens unit 305 may include one or more lenses.

[0107] Furthermore, the light source device also includes a third lens unit 306, located in the optical path of the narrow-spectrum beam emitted from the second lens unit 305 and the broadband beam emitted from the first lens unit 302, for collimating the incident beam so that the optical axes of all beams incident on the second rectangular incident surface of the second homogenizing element 303 coincide. In this embodiment, the narrow-spectrum beam emitted from the narrow-spectrum light source 100 contains narrow-spectrum light whose optical axes do not coincide. The third lens unit 306 makes the optical axes of all beams incident on the second rectangular incident surface of the second homogenizing element 303 coincide, improving the uniformity of light, reducing speckle effect, and enhancing the display effect. It should be understood that the third lens unit 306 may include one or more lenses.

[0108] In some embodiments, the light source device further includes a diffusion element located in the optical path of the narrow-spectrum beam emitted from the narrow-spectrum light source 100. This diffusion element can be a static or dynamic diffusion element to reduce speckle effects. Preferably, see below. Figure 16The light source device also includes a dynamic diffusion element 307. The maximum current limiting value for driving the dynamic diffusion element 307 is between 200mA and 400mA. The vibration frequency of the dynamic diffusion element 307 in the fifth and sixth directions is 50Hz, 60Hz, 70Hz, or 80Hz, and the fifth and sixth directions are perpendicular. When the vibration frequency of the dynamic diffusion element 307 in both the fifth and sixth directions is 50Hz, the duty cycle of the current driving the dynamic diffusion element 307 in the fifth direction is between 5% and 10%, and the duty cycle of the current driving the dynamic diffusion element 307 in the sixth direction is between 4% and 10%. When the vibration frequency of the dynamic diffusion element 307 in both the fifth and sixth directions is 60Hz, the current used to drive the dynamic diffusion element in the fifth direction... The duty cycle of the current in 307 is between 3% and 10%, and the duty cycle of the current used to drive the dynamic diffusion element 307 in the sixth direction is between 5% and 10%. When the vibration frequency of the dynamic diffusion element 307 in both the fifth and sixth directions is 70 Hz, the duty cycle of the current used to drive the dynamic diffusion element 307 in the fifth direction is between 10% and 20%, and the duty cycle of the current used to drive the dynamic diffusion element 307 in the sixth direction is between 13% and 30%. When the vibration frequency of the dynamic diffusion element 307 in both the fifth and sixth directions is 80 Hz, the duty cycle of the current used to drive the dynamic diffusion element 307 in the fifth direction is between 18% and 40%, and the duty cycle of the current used to drive the dynamic diffusion element 307 in the sixth direction is between 22% and 60%. In the prior art, the maximum current limit for driving dynamic diffusion elements is usually 500mA. Compared with the prior art, this embodiment reduces noise while maintaining the same speckle reduction effect. Table 1 provides an example of a driving current parameter setting.

[0109] Table 1

[0110]

[0111] Continue reading Figure 16The broadband light source 200 may include a green sub-light source 6 and an excitation sub-light source 7. The green sub-light source 6 includes a first sub-light source and a wavelength conversion material, the wavelength conversion material being used to generate a first green broadband light under the illumination of the first sub-light source. The excitation sub-light source 7 is used to emit excitation light, the excitation light being used to irradiate the wavelength conversion material to generate a second green broadband light. The first broadband light includes both the first green broadband light and the second green broadband light. In this embodiment, green broadband light is generated by double-sided excitation. More green broadband light can match more green narrowband light, thereby achieving control of green speckle under high brightness, and achieving a balance between speckle and color gamut by adjusting the current according to actual conditions. It should be understood that green broadband light can also be generated by only one green sub-light source 6 or more light sources; this embodiment of the invention does not limit this.

[0112] Furthermore, the broadband light source 200 may also include a red sub-light source 5 and a second light-combining element 8. The red LED light emitted from the red sub-light source 5 is combined with green fluorescence in the second light-combining element 8. The red LED light and red laser maintain the same timing sequence, and the green fluorescence and green laser maintain the same timing sequence, which can effectively suppress speckle in the corresponding monochromatic field, thereby improving the display effect. Optionally, each sub-light source in the broadband light source 200 has a beam-shrinking lens on its light-emitting side, such as... Figure 16 As shown. It should be understood that the broadband light source 200 may also include a blue sub-light source or a sub-light source of other colors.

[0113] For example, the second light-combining element 8 reflects red and blue light and transmits green light. The blue light emitted from the exciton light source 7 is reflected by the second light-combining element 8 to the green fluorescent material, generating green fluorescence. The green fluorescence and red light are then combined by the second light-combining element 8 and emitted. Specifically, the second light-combining element 8 can be a dichroic element that reflects light with wavelengths less than 450 nm and wavelengths greater than 609 nm, and transmits light with wavelengths between 545 and 565 nm.

[0114] Continue reading Figure 16The narrow-spectrum light source 100 includes a second narrow-spectrum sub-light source and a third narrow-spectrum sub-light source, which are arranged centrally symmetrically. The green and blue lasers of the two sub-light sources are packaged together. The green and blue lasers of one sub-light source are emitted through a reflector and a dichroic mirror, while the red laser is emitted through the dichroic mirror. The red laser of the other sub-light source is emitted through a reflector and a dichroic mirror, while the green and blue lasers are emitted through the dichroic mirror. Then, the three-color lasers are subjected to high-frequency vibrations of a dynamic diffuser 307 to reduce laser coherence. At the first homogenizing element 304 (such as a compound eye lens), the three-color lasers from the two sub-light sources form two light spots. Compared to combining two laser beams into one light spot, this can cover more compound eye units and reduce speckle. After the laser is emitted from the first homogenizing element 304, it passes through the second lens unit 305, is combined with a broadband beam at the first combining element 301, is collimated by the third lens unit 306, and homogenized by the second homogenizing element 303 before entering the illumination system.

[0115] It should be noted that the transmission function in the above embodiments can be changed to reflection, and the reflection function can be changed to transmission without affecting the overall optical path function. The embodiments of the present invention will not be described in detail.

[0116] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An optical system, characterized in that, It includes a light source device, a second light-diffusing element, and a display chip, wherein, The light source device is used to emit light from the light source, which includes narrow-spectrum beams and broad-spectrum beams. The second homogenizing element is located between the light source device and the display chip, and is used to homogenize the incident light source light, adjusting the shape of the incident light source light spot to a rectangle, such that the long side of the rectangular light spot of the light source light incident on the third rectangular incident surface of the display chip is parallel to the long side of the third rectangular incident surface, wherein the light spot of the broadband beam incident on the second rectangular incident surface of the second homogenizing element covers the light spot of the narrow-spectrum beam. The display chip is used to modulate the light source into image light; The light source device includes: Narrow-spectrum light source, used to emit narrow-spectrum light beams; Broadband light source, used to emit broadband light beams; The first lens unit is located in the optical path of the broadband beam emitted from the broadband light source. It is used to shape the incident broadband beam in at least one of the first and second directions, such that the ratio of the spot size of the broadband beam incident on the second rectangular incident surface in the first and second directions is related to the ratio of the long side and the short side of the second rectangular incident surface, and the incident angle of the broadband beam incident on the second rectangular incident surface in the first direction is smaller than that in the second direction, and the first direction is perpendicular to the second direction.

2. The optical system according to claim 1, characterized in that, The narrow-spectrum light source emits a narrow-spectrum beam with a rectangular or elliptical spot; the light source device further includes: The first homogenizing element is located in the optical path of the narrow-spectrum beam emitted from the narrow-spectrum light source. It is used to homogenize the narrow-spectrum beam and adjust the spot shape of the incident narrow-spectrum beam into a regular polygon or a rectangle with different lengths and widths. The long side of the spot of the narrow-spectrum beam incident on the first rectangular incident surface of the first homogenizing element is parallel to the long side of the first rectangular incident surface.

3. An optical system according to claim 2, characterized in that, The light source device also includes: The second lens unit is located in the optical path of the narrow-spectrum beam emitted from the first homogenizing element. It is used to reduce the divergence angle of the incident narrow-spectrum beam so that the spot size of the narrow-spectrum beam incident on the second rectangular incident surface is smaller than or equal to the second rectangular incident surface.

4. An optical system according to claim 3, characterized in that, The distance between the second lens unit and the first light-diffusing element is greater than or equal to 0.1 mm and less than or equal to 10 mm.

5. An optical system according to claim 3, characterized in that, The light source device also includes: The third lens unit is located in the optical path of the narrow-spectrum beam emitted from the second lens unit and the broadband beam emitted from the first lens unit. It is used to collimate the incident beam so that the optical axes of the beams incident on the second rectangular incident surface coincide.

6. An optical system according to claim 1, characterized in that, The broadband beam includes a first broadband beam, the narrow beam includes a first narrow beam, and the wavelength ranges of the first broadband beam and the first narrow beam at least partially overlap. The light source device also includes: A first beam combining element is used to guide at least a portion of a narrow-spectrum beam and at least a portion of a broadband beam to exit from the same direction and be incident on the second beam equalizing element, such that the energy of the narrow-spectrum beam exiting the first beam combining element accounts for at least 80% of the energy of the narrow-spectrum beam incident on the first beam combining element, and the energy of the broadband beam exiting the first beam combining element accounts for at least 40% of the energy of the broadband beam incident on the first beam combining element.

7. An optical system according to claim 6, characterized in that, The first broadband light and the first narrow-spectrum light are both green. The first beam combining element is used to transmit at least a portion of the narrow-spectrum light beam and reflect at least a portion of the broadband light beam, such that the energy of the first narrow-spectrum light emitted from the first beam combining element is at least 90% of the energy of the first narrow-spectrum light incident on the first beam combining element, and the energy of the first broadband light emitted from the first beam combining element is at least 45% of the energy of the first broadband light incident on the first beam combining element.

8. An optical system according to claim 6, characterized in that, The broadband beam further includes a second broadband beam, and the narrow beam further includes a second narrow beam, wherein the wavelength ranges of the second broadband beam and the second narrow beam at least partially overlap. The first light combining element is further configured to ensure that the energy of the second narrow-spectrum light emitted by the first light combining element is at least 90% of the energy of the second spectral light incident on the first light combining element, and that the energy of the second broad-spectrum light emitted by the first light combining element is at least 70% of the energy of the second broad-spectrum light incident on the first light combining element.

9. An optical system according to claim 8, characterized in that, The colors of the second broadband light and the second narrowband light are both red or blue.

10. An optical system according to any one of claims 6-8, characterized in that, The narrow-spectrum beam also includes a third narrow-spectrum beam, and the narrow-spectrum beam incident on the first optical combining element includes only one polarization state.

11. An optical system according to claim 7, characterized in that, The broadband light source includes a green sub-light source and an excitation sub-light source, wherein, The green sub-light source includes a first sub-light source and a wavelength conversion material, wherein the wavelength conversion material is used to generate a first green broadband light under the illumination of the first sub-light source; The exciton light source is used to emit excitation light, which is used to irradiate the wavelength conversion material to generate a second green broadband light; The first broadband light includes the first green broadband light and the second green broadband light.

12. An optical system according to claim 1, characterized in that, The narrow-spectrum light source includes a first narrow-spectrum sub-light source and a first guiding component, wherein... The first narrow-spectrum light source is used to emit a first beam with a rectangular or elliptical light spot; The first guiding component is used to split the first beam emitted from the first narrow spectrum light source into a first narrow spectrum beam and a second narrow spectrum beam with rectangular or elliptical light spots. The light spots of the first narrow-spectrum sub-beam and the second narrow-spectrum sub-beam emitted from the narrow-spectrum light source are arranged side by side, and the long side of the light spot of the narrow-spectrum beam is equal to the longer of the long side of the first narrow-spectrum beam and the second narrow-spectrum beam. The short side of the light spot of the narrow-spectrum beam is greater than or equal to the longer of the short side of the first narrow-spectrum beam and the second narrow-spectrum beam and the factor a, where a = 5 mm.

13. An optical system according to claim 1, characterized in that, The narrow-spectrum light source includes a second narrow-spectrum sub-light source and a third narrow-spectrum light source, which are two independent devices. The second narrow-spectrum light source is used to emit a first narrow-spectrum beam with a rectangular or elliptical light spot; The third narrow-spectrum light source is used to emit a second narrow-spectrum beam with a rectangular or elliptical light spot; The light spots of the first narrow-spectrum sub-beam and the second narrow-spectrum sub-beam emitted from the narrow-spectrum light source are arranged side by side, and the long side of the light spot of the narrow-spectrum beam is equal to the longer of the long side of the first narrow-spectrum beam and the second narrow-spectrum beam. The short side of the light spot of the narrow-spectrum beam is greater than or equal to the longer of the short side of the first narrow-spectrum beam and the second narrow-spectrum beam and the factor a, where a = 5 mm.

14. An optical system according to claim 6, characterized in that, The broadband beam further includes a second broadband beam, and / or the narrow beam further includes a second narrow beam, wherein the first broadband beam and the first narrow beam both have a first color, and the second broadband beam and the second narrow beam both have a second color; One lighting cycle of the light source device includes a first time period and a second time period, wherein the first time period is used to emit light of the second color and the second time period is used to emit light of the first color. The light source device is used to emit a second narrow-spectrum light and / or a second broad-spectrum light in the first time period, emit a first narrow-spectrum light and / or a first broad-spectrum light in the second time period, and emit a second narrow-spectrum light and / or a second broad-spectrum light in at least a portion of the second time period.

15. An optical system according to claim 1, characterized in that, The second light-diffusing element includes a second compound eye lens.

16. An optical system according to any one of claims 1-9, characterized in that, The light source device also includes: A dynamic diffusion element is located in the optical path of the narrow-spectrum beam emitted from the narrow-spectrum light source. The maximum current limiting value for driving the dynamic diffusion element is between 200mA and 400mA. The vibration frequency of the dynamic diffusion element in the fifth and sixth directions is 50Hz, 60Hz, 70Hz, or 80Hz. The fifth and sixth directions are perpendicular to each other. When the vibration frequency of the dynamic diffusion element in both the fifth and sixth directions is 50 Hz, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 5% and 10%, and the duty cycle of the current used to drive the dynamic diffusion element in the sixth direction is between 4% and 10%. When the vibration frequency of the dynamic diffusion element in both the fifth and sixth directions is 60 Hz, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 3% and 10%, and the duty cycle of the current used to drive the dynamic diffusion element in the sixth direction is between 5% and 10%. When the vibration frequency of the dynamic diffusion element in both the fifth and sixth directions is 70 Hz, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 10% and 20%, and the duty cycle of the current used to drive the dynamic diffusion element in the sixth direction is between 13% and 30%. When the vibration frequency of the dynamic diffusion element in both the fifth and sixth directions is 80 Hz, the duty cycle of the current used to drive the dynamic diffusion element in the fifth direction is between 18% and 40%, and the duty cycle of the current used to drive the dynamic diffusion element in the sixth direction is between 22% and 60%.

17. A projection device, characterized in that, The optical system comprising any one of claims 1-16.

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