LED digital light source structure and method based on rotary reflector

Abstract

The invention relates to an LED digital light source structure and method based on a rotary reflector. The LED digital light source structure comprises an LED light source array, a pixel unit, a light source enhancement module, a polygon prism reflector, a lens module, a communication module, an image control module and the like. A required projection image is input into the image control module, after data processing, correction and decomposition processing, the LED light source array is controlled through the communication module to output column light source information, light is focused and enhanced through the light source enhancement module, and the column light source information is circularly reflected to different positions of the lens module through the rotating polygon prism reflector. And then projecting to different positions of an external display area, and combining the rapidly refreshed column light source information to form complete image information by means of a persistence of vision effect of human eyes. According to the invention, an LED digital light output mode is changed from an array output mode to a rotary scanning mode, a high-pixel and high-resolution digital light image is realized by using a small number of luminous sources, and the digital light source equipment tends to be low in cost, miniaturized and practical due to a simple structure.

Description

Technical Field

[0001] The present invention relates to digital light source technology, and in particular to an LED digital light source structure and method based on a rotating mirror. Background Art

[0002] Digital light sources have been widely used in fields such as projectors, automotive pixel headlights, and stage lighting because they can precisely adjust the light-emitting parameters through a drive circuit to achieve better display effects. For example, automotive headlights can project information, images, or videos onto in-vehicle displays, windows, and road surfaces, enhancing nighttime driving safety and enabling intelligent assisted driving; projectors can output video image information, providing convenience for life and work, etc.

[0003] Current digital light source implementation methods mainly include DLP, Micro-LED, LED, laser, etc. The DLP solution is based on an LED light source, an array of micro reflectors, and an imaging system for image projection display. Due to its complex optical design and system, its color saturation and light source utilization rate are low, its volume is large, and its cost is high; the Micro-LED solution can directly perform high-definition imaging at the light source level and has excellent contrast, but it is limited by processes such as mass transfer and heat dissipation conditions. Micro-LED projection is mostly limited to tens of thousands of pixels, and the resolution is low; the LED solution is inexpensive, but the volume of a single crystal is large, making it difficult to complete long-distance projection. When arranged in a matrix, the heat generation is large and the pixels are low; although the laser solution has high brightness, its cost is high, and it has potential hazards to the human eye and imaging equipment.

[0004] Therefore, it is very important to invent a digital light source with high brightness, high resolution, low heat generation, and low cost, which has broad development prospects. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned shortcomings and deficiencies of the prior art, and provide an LED digital light source structure and method based on a rotating mirror. The present invention uses a single-row long rectangular LED light source, focuses and enhances the light through two groups of convex lenses, and then uses a multi-prism reflector to rotate and reflect the light at a constant speed, thereby outputting light information, and relying on the human eye's visual persistence effect to form a complete image with the quickly refreshed light information.

[0006] The present invention aims to achieve pixel amplification without affecting the overall projection brightness and heat dissipation, and uses a small number of LED light sources to achieve a high-pixel, high-resolution, and high-brightness projection image, improving the light utilization rate and reducing costs.

[0007] The programmable LED light source array of the present invention outputs column light source information according to control instructions. After receiving the control instructions and feedback signals, the multi-prism reflector rotates, cyclically reflects the column light source information to the lens module to output and amplify the digital light information, and finally forms complete image information by means of the human eye's visual persistence effect with the rapidly flashing multi-column digital light information.

[0008] The present invention is realized through the following technical solutions:

[0009] An LED digital light source structure based on a rotating reflector, comprising a light source substrate 1, a multi-prism reflector 3, a reflection optical path 4, and a lens module 5;

[0010] The light source substrate 1, the multi-prism reflector 3, and the lens module 5 are optically connected in sequence;

[0011] The multi-prism reflector 3 is used to form a reflection optical path 4, so that there is always a reflecting surface of the multi-prism reflector 3 reflecting the light emitted by the light source substrate 1; the multi-prism reflector 3 can rotate and reflect the light to different positions of the lens module 5;

[0012] The lens module 5 is installed on the upper right side of the multi-prism reflector 3 and outputs the reflected light to different positions outside; by means of the human eye's visual persistence effect, the rapidly refreshed light combination forms an output image 6.

[0013] On the optical path between the multi-prism reflector 3 and the lens module 5, there is also a light source enhancement module 2;

[0014] The light source enhancement module 2 is used to focus and enhance the light emitted from the light source substrate 1;

[0015] The light source enhancement module 2 is connected to the image control module 7 by a communication module 8; the image control module 7 transmits image control information to the light source enhancement module 2 through the communication module 8.

[0016] On the surface of the light source substrate 1, a data processing module 1-1, a driving chip 1-2, and a programmable LED light source matrix 1-3 are installed; the data processing module 1-1 controls the programmable LED light source matrix 1-3 by controlling the driving chip 1-2.

[0017] The multi-prism reflector 3 includes a motor module 3-1, a reflecting surface 3-2, and a card slot 3-3;

[0018] The motor module 3-1 is connected to the card slot 3-3 of the multi-prism, drives the reflecting mirror 3 of the multi-prism to rotate at a corresponding speed, ensures that the reflecting surface 3-2 reflects light, and feeds back speed and position information to the image control module 7 in real time through the communication module 8.

[0019] The light source enhancement module 2 is a housing that is thicker at the bottom and narrower at the top, including a top convex lens 2-1, an outer shell 2-2, and a bottom convex lens 2-3, and is fixed to the light source substrate 1 through a fixing frame 2-4;

[0020] The central distance between the top convex lens 2-1 and the bottom convex lens 2-3 is less than the focal length of the bottom convex lens 2-3;

[0021] The bottom convex lens 2-3 closely adheres to and completely covers the programmable LED light source matrix 1-3 to obtain focused light 2-6, and the top convex lens 2-1 changes the focused light 2-6 into parallel light 2-7;

[0022] The inner surface of the outer shell 2-2 is sprayed with matte black paint to absorb stray light 2-5 and reduce the factors interfering with the image.

[0023] The communication module 8 realizes remote signal transmission, supports protocols such as RS232 serial communication, WIFI communication, and Bluetooth communication, receives information such as the projected image, resolution, projection distance, and focal length selected by the user in the image control module 7, and transmits it to the data processing module 1-1.

[0024] The data processing module 1-1 analyzes the resolution, projection distance, and focal length signals received from the image control module 7, and changes the light emission frequency and brightness of the programmable LED light source matrix 1-3, the rotation speed and frequency of the motor module 3-1, and the distance parameters of the lens module 5, etc.

[0025] The data processing module 1-1 performs barrel distortion correction on the projected image information received from the image control module 7, decomposes the image by columns, and then controls the programmable LED light source matrix 1-3 to output image column information in sequence. The programmable LED light source matrix 1-3 outputs one or more columns of information at the same time.

[0026] Each row of the programmable LED light source matrix 1-3 can form a pixel unit 1-4. The pixel units 1-4 are arranged in a single column along the long side direction of the light source substrate 1, and its long side is parallel to the short side direction of the light source substrate 1. The aspect ratio includes 10:1, 9:1, 8:1, etc.

[0027] There is a spacing between every two pixel units 1-4. According to the resolution requirements, the spacing scale can be freely selected, including but not limited to scales such as millimeters and micrometers, which improves the heat dissipation efficiency.

[0028] The pixel unit 1-4 contains multiple LED crystal particles of red, blue, and green.

[0029] A method for forming a complete projected image based on quickly refreshing image column light rays is as follows:

[0030] The user inputs the required projection image in the image control module 7 and sets the projection parameters; the image control module 7 transmits control instructions to the data processing module 1-1 through the communication module 8; the data processing module 1-1 adjusts the emission frequency and brightness of the programmable LED light source matrix 1-3 and the rotation speed of the motor module 3-1, and after performing distortion correction and column decomposition on the required projection image, controls the programmable LED light source matrix 1-3 to emit light; the light containing image information forms parallel light 2-7 after being focused by the light source enhancement module 2 and filtering the stray light 2-5; the parallel light 2-7 is cyclically reflected by the rotating multi-prism mirror 3 at a set speed to different positions of the lens module 5; the lens module 5 magnifies the light and continuously projects the column light source information at different positions to the outside; due to the human eye's visual persistence effect, the rapidly refreshed image column light forms a complete projection image.

[0031] The present invention has the following advantages and effects compared with the prior art:

[0032] The present invention utilizes the human eye's visual persistence effect, decomposes the image, and outputs it column by column through a rotating scanning method, greatly improving the image resolution on the premise of the same number of LED light sources.

[0033] The present invention has a pixel array composed of only one column of LED light sources, and the device tends to be low-cost, miniaturized, and practical, and also improves the heat dissipation efficiency of related circuits;

[0034] The present invention can freely adjust the required output image resolution according to the emission frequency and rotation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of the LED digital light source based on a rotating mirror of the present invention.

[0036] Figure 2 is a schematic diagram of the programmable LED light source matrix and component layout on the light source substrate of the present invention.

[0037] Figure 3 is a schematic structural diagram and working principle diagram of the light source enhancement module of the present invention.

[0038] Figure 4 is a schematic structural diagram of the multi-prism mirror of the present invention.

[0039] Figure 5 is a flowchart of the implementation method of the LED digital light source based on a rotating mirror of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0040] The present invention will be further described in detail below with reference to specific embodiments.

[0041] An LED digital light source structure based on a rotating mirror, comprising a light source substrate 1, a polygonal prism mirror 3, a reflection optical path 4, and a lens module 5;

[0042] The light source substrate 1, the polygonal prism mirror 3, and the lens module 5 are sequentially optically connected;

[0043] The polygonal prism mirror 3 is used to form a reflection optical path 4, so that there is always a reflecting surface of the polygonal prism mirror 3 reflecting the light emitted by the light source substrate 1; the polygonal prism mirror 3 can rotate and reflect the light to different positions of the lens module 5;

[0044] The lens module 5 is installed on the upper right side of the polygonal prism mirror 3 and outputs the reflected light to different positions outside; by virtue of the human eye visual persistence effect, a rapidly refreshed light combination forms an output image 6.

[0045] On the optical path between the polygonal prism mirror 3 and the lens module 5, a light source enhancement module 2 is further provided;

[0046] The light source enhancement module 2 is used to focus and enhance the light emitted from the light source substrate 1;

[0047] The light source enhancement module 2 is connected to an image control module 7 by a communication module 8; the image control module 7 transmits image control information to the light source enhancement module 2 through the communication module 8.

[0048] A data processing module 1-1, a driving chip 1-2, and a programmable LED light source matrix 1-3 are mounted on the surface of the light source substrate 1; the data processing module 1-1 controls the programmable LED light source matrix 1-3 by controlling the driving chip 1-2. The programmable LED light source array 1-3 is arranged along the long side direction of the light source substrate 1 to form a pixel unit array distributed in a single column or multiple columns. The pixel unit is a long rectangle, and the aspect ratio can be changed according to the resolution requirements.

[0049] The polygonal prism mirror 3 includes a motor module 3-1, a reflecting surface 3-2, and a card slot 3-3;

[0050] The motor module 3-1 is connected to the card slot 3-3 of the polygonal prism, drives the reflecting mirror 3 of the polygonal prism to rotate at a corresponding speed, ensures that the reflecting surface 3-2 reflects light, and feeds back speed and position information to the image control module 7 in real time through the communication module 8.

[0051] The polygonal prism mirror 3 is not limited to a triangular prism, a quadrangular prism, a pentagonal prism, etc. The more reflecting surfaces there are, the faster the image refresh rate, but the smaller the horizontal output angle range of the image.

[0052] When the polygonal prism reflector is a triangular prism, the lateral output angle of the image is 120 degrees. When the polygonal prism reflector is a quadrangular prism or above, the lateral output angle of the image is Spend.

[0053] The output shaft of the motor module 3-1 is connected to the central hole of the polygonal column. During the rotation process, an encoder is used to collect the rotation speed in real time, and the rotation speed is adjusted in real time through the PID method. The rotation speed information is fed back to the image control module through the communication module for control.

[0054] The light source enhancement module 2 is a shell that is thick at the bottom and narrow at the top, including a top convex lens 2-1, a shell 2-2 and a bottom convex lens 2-3, and is fixed to the light source substrate 1 through a fixing frame 2-4;

[0055] The center distance between the top convex lens 2-1 and the lower bottom convex lens 2-3 is smaller than the focal length of the lower bottom convex lens 2-3; this distance enables the top convex lens to completely receive all the light focused by the lower bottom convex lens.

[0056] The lower convex lens 2-3 is in close contact with and completely covers the programmable LED light source matrix 1-3 to obtain focused light 2-6, and the top convex lens 2-1 changes the focused light 2-6 into parallel light 2-7;

[0057] The inner surface of the housing 2-2 is sprayed with matte black paint to absorb stray light 2-5 and reduce factors that interfere with the image. It is not limited to black polyethylene, black oxide coating, matte black paint and other materials that can absorb scattered light to avoid affecting image information.

[0058] The shell is not limited to a spherical table shape, a rectangular parallelepiped shape, etc., and the top surface and the bottom surface of the shell are composed of convex lenses.

[0059] The lower bottom convex lens of the light source enhancement module is close to the center of the upper surface of the programmable LED light source array and completely covers the light emitting surface of the programmable LED light source array to maximize the focusing and enhancement of the light of the programmable LED light source array.

[0060] The lower convex lens of the light source enhancement module focuses the light emitted by the pixel unit to enhance the brightness. The focused light is converted into parallel light by the top convex lens, thereby obtaining high-brightness projection image information.

[0061] The communication module 8 realizes remote signal transmission, supports RS232 serial communication, WIFI communication, Bluetooth communication and other protocols, receives the projection image, resolution, projection distance, focal length and other information selected by the user in the image control module 7, and transmits it to the data processing module 1-1.

[0062] The data processing module 1-1 analyzes the resolution, projection distance, and focal length signals received from the image control module 7, and changes the light emission frequency and brightness of the programmable LED light source matrix 1-3, the rotation speed and frequency of the motor module 3-1, and the distance parameter of the lens module 5, etc.

[0063] The data processing module 1-1 performs barrel distortion correction on the projection image information received from the image control module 7, decomposes the image by columns, and then controls the programmable LED light source matrix 1-3 to sequentially output image column information. The programmable LED light source matrix 1-3 outputs one or more columns of information at the same time.

[0064] As an optional solution, the communication module of the present invention can adopt wireless or wired communication methods, including communication between the programmable LED light source array and the image control module, communication between the image control module and the motor module, and communication between the image control module and the upper computer, aiming to ensure the anti-interference and rapidity of video information transmission.

[0065] As an optional solution, the image control module of the present invention allows users to specify the image content output by the light source, information such as resolution, brightness, and image size, and controls the parameters of the programmable LED light source array and the motor module through the communication module.

[0066] The data processing module receives the speed feedback from the motor module and dynamically adjusts the light emission frequency of the programmable LED light source array to ensure the stability of the image.

[0067] The data processing module performs barrel distortion correction, decomposition, and output on the image information to be projected, ensuring that the programmable LED light source array outputs the correct image information.

[0068] Each row of the programmable LED light source matrix 1-3 can form a pixel unit 1-4. The pixel units 1-4 are arranged in a single column along the long side direction of the light source substrate 1, and its long side is parallel to the short side direction of the light source substrate 1. The aspect ratios include 10:1, 9:1, 8:1, etc.

[0069] There is a spacing between every two pixel units 1-4. According to the resolution requirements, the spacing scale can be freely selected, including but not limited to scales such as millimeters and micrometers, improving the heat dissipation efficiency.

[0070] The pixel unit 1-4 contains multiple LED crystal particles of red, blue, and green to achieve multi-color light emission.

[0071] The long side of the pixel unit 1-4 is parallel to the short side direction of the light source substrate and is arranged at a certain interval. According to the resolution requirements, the spacing can be adjusted at the micrometer or millimeter scale, improving the heat dissipation efficiency.

[0072] Optionally, the pixel units of the long rectangle can be replaced by multiple short rectangle pixel units. The long sides of the short rectangle pixel units are arranged in a single column or multiple columns along the long side direction of the pixel units of the long rectangle. Each short rectangle pixel unit contains one or more tiny LED crystal particles of red, blue, and green.

[0073] A method for forming a complete projection image based on quickly refreshing image column light rays is as follows:

[0074] The user inputs the required projection image in the image control module 7 and sets the projection parameters; the image control module 7 transmits control instructions to the data processing module 1-1 through the communication module 8; the data processing module 1-1 adjusts the light-emitting frequency and brightness of the programmable LED light source matrix 1-3 and the rotation speed of the motor module 3-1, and after performing distortion correction and column decomposition on the required projection image, controls the programmable LED light source matrix 1-3 to emit light; the light rays containing image information are focused by the light source enhancement module 2 and filter the stray light 2-5 to form parallel light rays 2-7; the parallel light rays 2-7 are cyclically reflected by the rotating prism mirror 3 rotating at a set speed to different positions of the lens module 5; the lens module 5 magnifies the light rays and continuously projects the column light source information at different positions to the outside; due to the human eye's visual persistence effect, the quickly refreshed image column light rays form a complete projection image.

[0075] As described above, the present invention changes the traditional matrix LED digital light source into a new type of LED digital light source based on a rotating mirror, realizes pixel amplification without affecting the overall projection brightness, and uses a small number of LED light sources to achieve high-pixel and high-resolution image output. The simple structure makes the LED digital light source device tend to be low-cost, miniaturized, and practical, and also improves the heat dissipation efficiency of the relevant circuits.

[0076] The implementation manners of the present invention are not limited by the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement manners and are all included in the protection scope of the present invention.

Claims

1. An LED digital light source structure based on a rotating mirror, characterized in that, It includes a light source substrate (1), a multi-prism reflector (3), a reflection optical path (4), and a lens module (5); The light source substrate (1), the multi-prism reflector (3), and the lens module (5) are optically connected in sequence; The multi-prism reflector (3) is used to form a reflection optical path (4) so that there is always a reflecting surface of the multi-prism reflector (3) reflecting the light emitted by the light source substrate (1); the multi-prism reflector (3) can rotate and reflect the light to different positions of the lens module (5); The lens module (5) is installed on the upper right side of the multi-prism reflector (3) and outputs the reflected light to different positions outside; by means of the human eye visual persistence effect, a rapidly refreshed light combination forms an output image (6).

2. The LED digital light source structure based on a rotating mirror according to claim 1, characterized in that On the optical path between the multi-prism reflector (3) and the lens module (5), a light source enhancement module (2) is also provided; The light source enhancement module (2) is used to focus and enhance the light emitted from the light source substrate (1); The light source enhancement module (2) is connected to the image control module (7) by a communication module (8); the image control module (7) transmits image control information to the light source enhancement module (2) through the communication module (8).

3. The LED digital light source structure based on a rotating mirror according to claim 2, characterized in that, A data processing module (1-1), a driving chip (1-2), and a programmable LED light source matrix (1-3) are surface-mounted on the light source substrate (1); the data processing module (1-1) controls the programmable LED light source matrix (1-3) by controlling the driving chip (1-2).

4. The LED digital light source structure based on a rotating mirror according to claim 2, wherein The multi-prism reflector (3) includes a motor module (3-1), a reflecting surface (3-2), and a card slot (3-3); The motor module (3-1) is connected to the card slot (3-3) of the multi-prism, drives the reflector 3 of the multi-prism to rotate at a corresponding speed, ensures that the reflecting surface (3-2) reflects light, and feeds back speed and position information to the image control module (7) in real time through the communication module (8).

5. The LED digital light source structure based on a rotating mirror according to claim 2, wherein The light source enhancement module (2) is a shell with a wider bottom and a narrower top, including a top convex lens (2-1), a housing (2-2), and a bottom convex lens (2-3), and is fixed to the light source substrate (1) through a fixing frame (2-4); The central distance between the top convex lens (2-1) and the bottom convex lens (2-3) is less than the focal length of the bottom convex lens (2-3); The bottom convex lens (2-3) closely adheres to and completely covers the programmable LED light source matrix (1-3) to obtain focused light (2-6), and the top convex lens (2-1) changes the focused light (2-6) into parallel light (2-7); The inner surface of the housing (2-2) is sprayed with matte black paint to absorb stray light (2-5) and reduce the factors interfering with the image.

6. The LED digital light source structure based on a rotating mirror according to claim 3, characterized in that The data processing module (1-1) analyzes the resolution, projection distance, and focal length signals in the image control module (7), and changes the light emission frequency and brightness of the programmable LED light source matrix (1-3), the rotation speed and frequency of the motor module (3-1), and the distance parameters of the lens module (5).

7. The LED digital light source structure based on a rotating mirror according to claim 3, wherein, The data processing module (1-1) corrects the barrel distortion of the projection image information in the received image control module (7), decomposes the image by columns, and then controls the programmable LED light source matrix (1-3) to sequentially output image column information. The programmable LED light source matrix (1-3) outputs one or more columns of information at the same time.

8. The LED digital light source structure based on a rotating mirror according to claim 3, wherein, Each row of the programmable LED light source matrix (1-3) can form a pixel unit (1-4). The pixel units (1-4) are arranged in a single column along the long side direction of the light source substrate (1), and its long side is parallel to the short side direction of the light source substrate (1), with an aspect ratio of 10:1, 9:1, or 8:

1.

9. The LED digital light source structure based on a rotating mirror according to claim 8, characterized in that, There is a spacing between every two pixel units (1-4), and the spacing scale can be freely selected according to the resolution requirements. The pixel unit (1-4) contains a number of LED crystal particles of red, blue, and / or green.

10. A method for forming a complete projected image based on the light rays of a rapidly refreshed image column, characterized in that It is implemented by using the LED digital light source structure based on a rotating mirror according to any one of claims 1-9. The specific steps are as follows: The user inputs the required projection image in the image control module (7) and sets the projection parameters. The image control module (7) transmits control instructions to the data processing module (1-1) through the communication module (8). The data processing module (1-1) adjusts the emission frequency and brightness of the programmable LED light source matrix (1-3) and the rotation speed of the motor module (3-1). After correcting the distortion and decomposing the required projection image by columns, it controls the programmable LED light source matrix (1-3) to emit light. The light containing image information forms parallel light (2-7) after being focused by the light source enhancement module (2) and filtering out the stray light (2-5). The parallel light (2-7) is cyclically reflected by the multi-prism reflector (3) rotating continuously at a set speed to different positions of the lens module (5). The lens module (5) magnifies the light and continuously projects the column light source information at different positions to the outside. Due to the human eye's visual persistence effect, the rapidly refreshed image column light forms a complete projection image.

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