Mixed light source device and projection device

Abstract

The utility model belongs to the field of projection, and particularly relates to a mixed light source device and a projection device.The mixed light source device comprises a blue laser, a diffusion plate, a dichroic mirror, a 1 / 4 wavelength plate, a first lens assembly, a reflection diffusion plate and a wavelength conversion device; after passing through the 1 / 4 wavelength plate and the first lens assembly, the blue P polarized light is reflected by the reflection diffusion plate and then sequentially passes through the first lens assembly and the 1 / 4 wavelength plate to be converted into diffused second blue S polarized light, and the wavelength conversion device converts the first blue S polarized light into green light; the LED lamp further comprises a red LED light source and a color combination device. The red LED light source emits red light. And the color combining device transmits the green light and the second blue S polarized light reflected by the dichroic mirror, reflects the red light, converges the green light, the second blue S polarized light and the red light, and uniformly transmits the converged light out. According to the technical scheme, the cost of the mixed light source device is reduced, the size is reduced, and meanwhile high brightness is achieved.

Description

Technical Field

[0001] The present application belongs to the field of projection, and in particular, relates to a mixed light source device and a projection device. Background Art

[0002] In recent years, with the development of projection technology, projection devices have been widely used in home, education, office and other fields. Among them, laser projection devices have the characteristics of high brightness, wide color gamut, long life, etc., but laser projection devices are expensive, and the optical path for processing laser speckle is complex and the cost is high; LED projectors have the characteristics of small size, easy to carry, long life, high color gamut, etc., but it is difficult for LED projectors to achieve high brightness.

[0003] With the above existing solutions, it is difficult to achieve the goal of reducing the cost and size of the projection device while having high brightness. Therefore, it is urgent to provide a hybrid light source device to solve the above problems in the existing technology. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a hybrid light source device and a projection device, aiming to solve the technical problem in the prior art that the light source device cannot achieve high brightness and low cost at the same time.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present application is: to provide a hybrid light source device, including a blue laser; a diffusion plate arranged in front of the optical path of the blue laser, used to change the light intensity distribution of the blue laser emitted by the blue laser; a dichroic mirror arranged obliquely in front of the diffusion plate, used to reflect the first blue S polarized light in the blue laser and transmit the blue P polarized light in the blue laser; a 1 / 4 wavelength plate arranged just in front of the optical path of the blue P polarized light; a first lens assembly arranged in the optical path of the blue P polarized light and in front of the 1 / 4 wavelength plate; a reflective diffusion plate arranged in the optical path of the blue P polarized light and in front of the first lens assembly; after the blue P polarized light passes through the 1 / 4 wavelength plate and the first lens assembly, it is reflected by the reflective diffusion plate and then passes through the first lens assembly and the 1 / 4 wavelength plate in sequence to be transformed into a diffused second blue S polarized light;

[0006] a wavelength conversion device disposed in front of the optical path of the first blue S-polarized light, used to convert the first blue S-polarized light into green light; a second lens assembly disposed in front of the optical path of the green light, used to collimate the green light, and the collimated green light passes through the dichroic mirror;

[0007] A red LED light source; a third lens assembly disposed in front of the optical path of the red light emitted by the red LED light source, for collimating the red light;

[0008] The color combining device is arranged in front of the optical paths of the green light, the second blue S-polarized light and the red light, and is used for transmitting the green light and the second blue S-polarized light reflected by the dichroic mirror, reflecting the red light, and converging the green light, the second blue S-polarized light and the red light and transmitting them out uniformly.

[0009] Specifically, an angle is formed between the blue laser and the optical axis.

[0010] Furthermore, the angle ranges from 20° to 30°.

[0011] Specifically, the wavelength range of the blue laser light emitted by the blue laser is 449nm to 461nm.

[0012] Specifically, the first lens assembly includes a first lens and a second lens that are spaced apart, the second lens assembly includes a third lens and a fourth lens, and the third lens assembly includes a fifth lens and a sixth lens.

[0013] Furthermore, the areas of the incident surface and the exit surface of the first lens are both larger than the areas of the incident surface and the exit surface of the second lens, the areas of the incident surface and the exit surface of the third lens are both larger than the areas of the incident surface and the exit surface of the fourth lens, and the areas of the incident surface and the exit surface of the fifth lens are both larger than the areas of the incident surface and the exit surface of the sixth lens.

[0014] Specifically, the optical axis of the light emitted by the blue laser is perpendicular to the optical axis of the light emitted by the wavelength conversion device.

[0015] Specifically, the optical axis of the light emitted by the red LED light source is perpendicular to the optical axis of the light emitted by the wavelength conversion device.

[0016] Specifically, the optical axis of the light emitted by the blue laser is parallel to the optical axis of the light emitted by the red LED light source.

[0017] The present application also provides a projection device, including a light source device, a display chip and a projection lens group, wherein the light source device is the above-mentioned hybrid light source device.

[0018] In the present application, a blue laser emits a blue laser, and the blue laser rotates around the optical axis at a certain angle, preferably in the range of 20° to 30°. After passing through the diffusion plate, the blue P polarized light emitted by the blue laser is transmitted at the dichroic mirror and the first blue S polarized light emitted by the blue laser is reflected. The blue P polarized light passes through the 1 / 4 wavelength plate and the first lens assembly and reaches the reflective diffusion plate, is reflected by the reflective diffusion plate, and then returns to pass through the first lens assembly and the 1 / 4 wavelength plate, so that the blue P polarized light becomes the diffused second blue S polarized light, which is then reflected by the dichroic mirror and then transmitted through the color combining device; the reflected first blue S polarized light enters the second lens assembly, and is converted into green light at the wavelength conversion device. The green light is collimated by the second lens assembly and transmitted through the dichroic mirror and the color combining device; the red LED light source emits red light, passes through the third lens assembly, and is reflected at the color combining device. The reflected red light, the second blue S polarized light and the green light converge to form three primary colors of light that are input into the optical channel of the projection. The present application uses blue laser and red LED as light sources, which have extremely high brightness output. At the same time, it also avoids the speckle problem and high price problem of using only laser as the light source, reduces the size of the light source device, and is easy to carry. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure and optical path of a hybrid light source device provided in an embodiment of the present application;

[0021] Among them, the reference numerals in the figure are:

[0022] 1-blue laser; 2-diffuser plate; 3-dichroic mirror; 4-1 / 4 wavelength plate; 5-first lens; 6-second lens; 7-reflective diffuser plate; 8-wavelength conversion device; 81-third lens; 82-fourth lens; 9-red LED light source; 91-fifth lens; 92-sixth lens; 10-color combining device. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0024] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It should be understood that the directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0027] Reference Figure 1 The embodiment of the present application provides a hybrid light source device, including a blue laser 1; a diffusion plate 2 arranged in front of the optical path of the blue laser 1, used to change the light intensity distribution of the blue laser emitted by the blue laser 1; a dichroic mirror 3 arranged obliquely in front of the diffusion plate 2, used to reflect the first blue S polarized light in the blue laser and transmit the blue P polarized light in the blue laser; a 1 / 4 wavelength plate 4 arranged just in front of the optical path of the blue P polarized light; a first lens assembly arranged on the optical path of the blue P polarized light and in front of the 1 / 4 wavelength plate 4; a reflective diffusion plate 7 arranged on the optical path of the blue P polarized light and in front of the first lens assembly; after the blue P polarized light passes through the 1 / 4 wavelength plate 4 and the first lens assembly, it is reflected by the reflective diffusion plate 7 and then passes through the first lens assembly and the 1 / 4 wavelength plate 4 in sequence to be transformed into a diffused second blue S polarized light;

[0028] The wavelength conversion device 8 is arranged in front of the optical path of the first blue S-polarized light, and is used to convert the first blue S-polarized light into green light; the second lens assembly is arranged in front of the optical path of the green light, and is used to collimate the green light, and the collimated green light passes through the dichroic mirror 3;

[0029] A red LED light source 9; a third lens assembly disposed in front of the optical path of the red light emitted by the red LED light source 9, for collimating the red light;

[0030] The color combining device 10 is arranged in front of the optical path of the green light, the second blue S-polarized light and the red light, and is used to transmit the green light and the second blue S-polarized light reflected by the dichroic mirror 3, reflect the red light, and converge the green light, the second blue S-polarized light and the red light and transmit them out evenly.

[0031] In this embodiment, the blue laser 1 emits a blue laser, and the blue laser 1 rotates around the optical axis at a certain angle, preferably in the range of 20° to 30°. After passing through the diffusion plate 2, the blue P polarized light emitted by the blue laser 1 is transmitted at the dichroic mirror 3 and the first blue S polarized light emitted by the blue laser 1 is reflected. The blue P polarized light reaches the reflective diffusion plate 7 after passing through the 1 / 4 wavelength plate 4 and the first lens assembly, is reflected by the reflective diffusion plate 7, and then returns to pass through the first lens assembly and the 1 / 4 wavelength plate 4, so that the blue P polarized light becomes the diffused second blue S polarized light, and then is reflected by the dichroic mirror 3 and transmitted through the color combining device 10; the reflected first blue S polarized light enters the second lens assembly, and is converted into green light at the wavelength conversion device 8. The green light is collimated by the second lens assembly and transmitted through the dichroic mirror 3 and the color combining device 10; the red LED light source 9 emits red light, passes through the third lens assembly, and is reflected at the color combining device 10. The reflected red light, the second blue S polarized light and the green light are converged together to form three primary color lights that are input into the optical channel of the projection. The present application uses blue laser and red LED as light sources, which have extremely high brightness output. At the same time, it also avoids the speckle problem and high price problem of using only laser as the light source, reduces the size of the light source device, and is easy to carry.

[0032] Specifically, an angle is formed between the blue laser 1 and the optical axis, so that the blue light emitted by the blue laser 1 has a certain angle with the optical axis, thereby improving the brightness of the blue laser.

[0033] Furthermore, the angle range is 20° to 30°, and the effect is best within this angle range.

[0034] Specifically, the wavelength range of the blue laser emitted by the blue laser 1 is 449 nm to 461 nm. This wavelength range is the best wavelength range for the blue laser. The blue laser within this range has better penetration and high brightness.

[0035] Specifically, the first lens assembly includes a first lens 5 and a second lens 6 that are spaced apart, the second lens assembly includes a third lens 81 and a fourth lens 82, the third lens assembly includes a fifth lens 91 and a sixth lens 92, and each lens assembly consists of two lenses to enhance the collimation effect of the lens.

[0036] Furthermore, the areas of the incident surface and the exit surface of the first lens 5 are larger than the areas of the incident surface and the exit surface of the second lens 6, the areas of the incident surface and the exit surface of the third lens 81 are larger than the areas of the incident surface and the exit surface of the fourth lens 82, and the areas of the incident surface and the exit surface of the fifth lens 91 are larger than the areas of the incident surface and the exit surface of the sixth lens 92.

[0037] In this embodiment, the blue laser 1 emits a blue laser, which passes through the diffusion plate 2 and transmits the blue P polarized light emitted by the blue laser 1 and reflects the first blue S polarized light emitted by the blue laser 1 at the dichroic mirror 3 after passing through the diffusion plate 2 . The blue P polarized light passes through the 1 / 4 wavelength plate 4, the first lens 5 and the second lens 6 in sequence and reaches the reflective diffusion plate 7. It is reflected by the reflective diffusion plate 7 and then returns to pass through the second lens 6, the first lens 5 and the 1 / 4 wavelength plate 4, so that the blue P polarized light becomes the diffused second blue S polarized light, and then is reflected by the dichroic mirror 3 and passes through the color combining device 10; the reflected first blue S polarized light passes through the third lens 81 and the fourth lens 82 in sequence, and is converted into green light at the wavelength conversion device 8. The green light is collimated by the fourth lens 82 and the third lens 81, and then passes through the dichroic mirror 3 and the color combining device 10; the red LED light source 9 emits red light, passes through the sixth lens 92 and the fifth lens 91 in sequence, and is reflected at the color combining device 10. The reflected red light is converged with the second blue S polarized light and the green light to form three-primary color light and input into the projection optical channel.

[0038] Specifically, the optical axis of the light emitted by the blue laser 1 is perpendicular to the optical axis of the light emitted by the wavelength conversion device 8. The vertical arrangement of the two makes better use of the space arrangement, makes the structure of the light source device more compact, and reduces the size of the light source device.

[0039] Specifically, the optical axis of the light emitted by the red LED light source 9 is perpendicular to the optical axis of the light emitted by the wavelength conversion device 8 , and the vertical arrangement of the two makes better use of the space arrangement, making the structure of the light source device more compact.

[0040] Specifically, the optical axis of the light emitted by the blue laser 1 is parallel to the optical axis of the light emitted by the red LED light source 9 , and the parallel arrangement of the two makes the structure of the light source device more compact.

[0041] The present application also provides a projection device, including a light source device, a display chip and a projection lens group. The light source device is the above-mentioned hybrid light source device. The projection device using the hybrid light source device is not only small in size and easy to carry, but also has high brightness and no speckle problem.

[0042] In summary, the above structure simplifies the light path of the mixed light source device, reduces the size of the light source device, reduces the cost and improves the brightness, and also enables the mixed light source to be more widely used in projection.

[0043] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A hybrid light source device, characterized in that: Includes blue laser; A diffusion plate disposed in front of the optical path of the blue laser, used to change the light intensity distribution of the blue laser emitted by the blue laser; a dichroic mirror disposed obliquely in front of the diffusion plate, used for reflecting the first blue S-polarized light in the blue laser and transmitting the blue P-polarized light in the blue laser; A quarter wavelength plate disposed directly in front of the optical path of the blue P polarized light; A first lens assembly disposed on the optical path of the blue P polarized light and in front of the 1 / 4 wavelength plate; a reflective diffusion plate disposed on the optical path of the blue P polarized light and in front of the first lens assembly; After passing through the quarter wavelength plate and the first lens assembly, the blue P polarized light is reflected by the reflective diffusion plate and then passes through the first lens assembly and the quarter wavelength plate in sequence to be transformed into a diffused second blue S polarized light; a wavelength conversion device disposed in front of the optical path of the first blue S-polarized light, for converting the first blue S-polarized light into green light; A second lens assembly disposed in front of the optical path of the green light, used for collimating the green light, and the collimated green light passes through the dichroic mirror; Red LED light source; a third lens assembly disposed in front of the optical path of the red light emitted by the red LED light source, for collimating the red light; The color combining device is arranged in front of the optical paths of the green light, the second blue S-polarized light and the red light, and is used for transmitting the green light and the second blue S-polarized light reflected by the dichroic mirror, reflecting the red light, and converging the green light, the second blue S-polarized light and the red light and transmitting them out uniformly.

2. A hybrid light source device according to claim 1, characterized in that: An angle is formed between the blue laser and the optical axis.

3. A hybrid light source device according to claim 2, characterized in that: The angle ranges from 20° to 30°.

4. The hybrid light source device according to claim 1, characterized in that: The wavelength range of the blue laser light emitted by the blue laser is 449nm-461nm.

5. The hybrid light source device according to claim 1, characterized in that: The first lens assembly includes a first lens and a second lens that are spaced apart from each other, the second lens assembly includes a third lens and a fourth lens, and the third lens assembly includes a fifth lens and a sixth lens.

6. A hybrid light source device according to claim 5, characterized in that: The areas of the incident surface and the exit surface of the first lens are both larger than those of the second lens, the areas of the incident surface and the exit surface of the third lens are both larger than those of the fourth lens, and the areas of the incident surface and the exit surface of the fifth lens are both larger than those of the sixth lens.

7. The hybrid light source device according to claim 1, characterized in that: The optical axis of the light emitted by the blue laser is perpendicular to the optical axis of the light emitted by the wavelength conversion device.

8. The hybrid light source device according to claim 1, characterized in that: The optical axis of the light emitted by the red LED light source is perpendicular to the optical axis of the light emitted by the wavelength conversion device.

9. The hybrid light source device according to claim 1, characterized in that: The optical axis of the light emitted by the blue laser is parallel to the optical axis of the light emitted by the red LED light source.

10. A projection device, comprising a light source device, a display chip and a projection lens assembly, characterized in that: The light source device is the mixed light source device according to any one of claims 1 to 9.

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