System and method for detecting working state of light source of pixel projection headlamp

Abstract

The invention discloses a light source working state detection system and method of a pixel projection headlamp. The system comprises a projection module, a signal acquisition module and a light source working state detection module. The method comprises the steps of S1, turning on a pixel projection headlamp and projecting an image to a target position; s2, initializing a count value to be 0, and acquiring a projected image by a photosensitive sensor and generating a corresponding level period; s3, the light source working state detection module judges whether the level periods of the first photosensitive sensor and the second photosensitive sensor are the same or not; s4, the light source working state detection module judges whether the level periods of the first photosensitive sensor and the third photosensitive sensor are the same or not; s5, the light source working state detection module judges whether the level periods of the fourth photosensitive sensor and the second photosensitive sensor are the same or not; s6, the light source working state detection module judges whether the level periods of the fourth photosensitive sensor and the third photosensitive sensor are the same or not; s7, judging whether the count value is greater than 1 or not; and S8, judging the working state of the light source of the pixel projection headlamp. The invention provides a low-cost, simple and reliable light source working state detection scheme for a high-resolution pixel projection headlamp.

Description

Technical Field

[0001] The invention belongs to the field of automobile lamp detection, and in particular relates to a light source working state detection system and method for a pixel projection headlight. Background Art

[0002] Currently, smart cars are gradually beginning to use high-resolution pixel projection headlights, among which Micro-LED 10,000-pixel light sources are the main light sources of such headlights. When such headlights are equipped with projection turn signal functions, circuit solutions that support functional safety levels above ASILB are required to detect whether the turn signal symbols projected by such headlights are normally displayed on the road surface (invisible to the driver) and serve as turn prompts. However, there is currently no mature technology on the market to detect such pixel projection headlights. Summary of the invention

[0003] The purpose of the present invention is to provide a light source working status detection system and method for a pixel projection headlight, to provide a low-cost, simple and reliable light source working status detection solution for high-resolution pixel projection headlights, and to determine whether the projection lamp function of the pixel projection headlight meets the technical indicators.

[0004] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention is as follows:

[0005] A light source working state detection system for a pixel projection headlight, comprising:

[0006] A projection module, used to enable the pixel projection headlight to project an image and generate a corresponding pixel period control signal;

[0007] A signal acquisition module, comprising a plurality of sensors; the plurality of sensors are evenly distributed and installed on the pixel projection headlight; the signal acquisition module is used to collect pixel point periodic control signals through the sensors, and generate corresponding level periods and send them to the light source working state detection module;

[0008] The light source working state detection module is used to determine the light source working state of the pixel projection headlight according to the level cycle generated by the signal acquisition module.

[0009] The present invention provides a light source working state detection system for a pixel projection headlight. First, multiple sensors are installed on the pixel projection headlight, and the pixel projection headlight is used to project an image through a projection module. Then, the signal acquisition module can acquire pixel point periodic control signals through the sensors and generate corresponding level cycles, so that the light source working state detection module can determine whether the light source working state of the pixel projection headlight is normal according to the level cycle generated by the signal acquisition module. The present invention can provide a low-cost, simple and reliable light source working state detection solution for high-resolution pixel projection headlights, and determine whether the projection lamp function of the pixel projection headlight meets the technical indicators.

[0010] Preferably, the signal acquisition module includes a plurality of photosensitive sensors; the pixel projection headlight includes a plurality of lenses; and each of the lenses is mounted with a plurality of the photosensitive sensors.

[0011] Preferably, the light-sensitive sensor comprises a light-shielding cap and a fixing column; one side of the fixing column is fixedly mounted on the lens; and the light-shielding cap is mounted on the other side of the fixing column.

[0012] Preferably, the signal acquisition module further includes a signal acquisition circuit; the input end of the signal acquisition circuit is connected to the light shielding cap; the output end of the signal acquisition circuit is connected to the light source working status detection module.

[0013] Preferably, the signal acquisition circuit includes a first resistor, a second resistor, an amplifier, and an input voltage; the light source working status detection module includes a processor; the input voltage is connected to the input end of the shading cap; the output end of the shading cap is connected to the in-phase input end of the amplifier; the node between the shading cap and the in-phase input end of the amplifier is connected to one end of the first resistor; the other end of the first resistor is grounded; the reverse input end of the amplifier is connected to one end of the second resistor; the other end of the second resistor is grounded; and the output end of the amplifier is connected to the processor.

[0014] Preferably, the projection module includes a light switch submodule and an imaging submodule;

[0015] The switch light submodule is used to control the pixel projection headlight to turn on or off;

[0016] The imaging submodule is used to form an image and project it through the pixel projection headlight.

[0017] Preferably, the multiple photosensors include a first photosensor, a second photosensor, a third photosensor, and a fourth photosensor; the first photosensor is installed at the upper left corner of the lens; the second photosensor is installed at the upper right corner of the lens; the third photosensor is installed at the lower left corner of the lens; and the fourth photosensor is installed at the lower right corner of the lens.

[0018] The present invention also provides a method for detecting the working state of a light source of a pixel projection headlight, which is applied to the above-mentioned system for detecting the working state of a light source of a pixel projection headlight; the method for detecting the working state of a light source comprises the following steps:

[0019] Step S1. The pixel projection headlight is turned on and an image is projected to a target location;

[0020] Step S2. The count value is initialized to 0, the photosensitive sensor collects the pixel period control signal generated by the pixel projection headlight projection image, and generates a corresponding level period and sends it to the light source working status detection module;

[0021] Step S3. The light source working state detection module determines whether the level cycles of the first photosensor and the second photosensor are the same; if so, the process proceeds to step S4; if not, the count value is increased by one and then the process proceeds to step S4;

[0022] Step S4. The light source working state detection module determines whether the level cycles of the first photosensor and the third photosensor are the same; if so, the process proceeds to step S5; if not, the count value is increased by one and then the process proceeds to step S5;

[0023] Step S5. The light source working state detection module determines whether the level cycles of the fourth photosensor and the second photosensor are the same; if so, the process proceeds to step S6; if not, the count value is increased by one and then the process proceeds to step S6;

[0024] Step S6. The light source working state detection module determines whether the level cycles of the fourth photosensor and the third photosensor are the same; if so, the process proceeds to step S7; if not, the count value is increased by one and then the process proceeds to step S7;

[0025] Step S7. Determine whether the count value is greater than 1. If so, proceed to step S8; if not, return to step S2;

[0026] Step S8. The light source working state detection module determines that the light source working state of the pixel projection headlight is abnormal.

[0027] Preferably, the frame rate of the image projected by the pixel-projected headlight in step S1 is 10 to 20 frames per second; and the level period generated by the photosensitive sensor in step S2 is 50 to 80 ms.

[0028] Preferably, in steps S3 to S6, the light source working status detection module identifies the frame rate matching degree of the projected image according to the level period of the photosensor, and determines whether the frame rate of the image projected by the pixel projection headlight is normal.

[0029] Beneficial effects:

[0030] The present invention provides a light source working state detection system and method for a pixel projection headlight. First, multiple sensors are installed on the pixel projection headlight, and the pixel projection headlight is used to project an image through a projection module. Then, the signal acquisition module can collect pixel point periodic control signals through the sensor and generate corresponding level cycles, so that the light source working state detection module can determine whether the light source working state of the pixel projection headlight is normal according to the level cycle generated by the signal acquisition module. The present invention can provide a low-cost, simple and reliable light source working state detection solution for high-resolution pixel projection headlights, and determine whether the projection lamp function of the pixel projection headlight meets the technical indicators. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The figure is a structural block diagram of a light source working state detection system of a pixel projection headlight according to an embodiment;

[0032] Figure 2 A first schematic diagram of a pixel projector headlight mounted sensor according to an embodiment is shown;

[0033] Figure 3 A second schematic diagram of a pixel projector headlight mounted sensor according to an embodiment is shown;

[0034] Figure 4 Shown Figure 3 A partial enlarged view of part A;

[0035] Figure 5 Shown is a schematic diagram of a signal acquisition circuit of an embodiment;

[0036] Figure 6 Shown is a timing diagram of a method for detecting the working state of a light source of a pixel projection headlight according to an embodiment;

[0037] Figure 7 A schematic diagram showing a method for detecting the working state of a pixel projection headlight according to an embodiment of the present invention for identifying the frame rate matching degree of a projection image.

[0038] Reference numerals

[0039] 11. First lens; 12. Second lens; 13. Third lens; 14. LED module; 15. Main control board; 16. Heat sink; 17. Fourth lens; 21. First photosensor; 22. Second photosensor; 23. Third photosensor; 24. Fourth photosensor; 241. Sunshade cap; 242. Fixing column; 25. Amplifier; 26. Processor. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0041] The technical solution of the present invention is described in detail below with specific embodiments.

[0042] Embodiment 1

[0043] like Figures 1 to 5 As shown, a light source working state detection system of a pixel projection headlight of this embodiment includes:

[0044] A projection module, used to enable the pixel projection headlight to project an image and generate a corresponding pixel period control signal;

[0045] A signal acquisition module, comprising a plurality of sensors; the plurality of sensors are evenly distributed and installed on the pixel projection headlight; the signal acquisition module is used to collect pixel point periodic control signals through the sensors, and generate corresponding level periods and send them to the light source working state detection module;

[0046] The light source working state detection module is used to determine the light source working state of the pixel projection headlight according to the level cycle generated by the signal acquisition module.

[0047] Preferably, the signal acquisition module includes a plurality of photosensitive sensors; the pixel projection headlight includes a plurality of lenses; and each of the lenses is mounted with a plurality of the photosensitive sensors.

[0048] Preferably, the light-sensitive sensor includes a light-shielding cap 241 and a fixing column 242 ; one side of the fixing column 242 is fixedly mounted on the lens; and the light-shielding cap 241 is mounted on the other side of the fixing column 242 .

[0049] Preferably, the signal acquisition module further includes a signal acquisition circuit; the input end of the signal acquisition circuit is connected to the light shielding cap 241; and the output end of the signal acquisition circuit is connected to the light source working status detection module.

[0050] Preferably, the signal acquisition circuit includes a first resistor R1, a second resistor R2, an amplifier 25, and an input voltage; the light source working status detection module includes a processor 26; the input voltage is connected to the input end of the shading cap 241; the output end of the shading cap 241 is connected to the in-phase input end of the amplifier 25; the node between the shading cap 241 and the in-phase input end of the amplifier 25 is connected to one end of the first resistor R1; the other end of the first resistor R1 is grounded; the reverse input end of the amplifier 25 is connected to one end of the second resistor R2; the other end of the second resistor R2 is grounded; the output end of the amplifier 25 is connected to the processor 26.

[0051] Preferably, the projection module includes a light switch submodule and an imaging submodule;

[0052] The switch light submodule is used to control the pixel projection headlight to turn on or off;

[0053] The imaging submodule is used to form an image and project it through the pixel projection headlight.

[0054] Preferably, the multiple photosensors include a first photosensor 21, a second photosensor 22, a third photosensor 23, and a fourth photosensor 24; the first photosensor 21 is installed at the upper left corner of the lens; the second photosensor 22 is installed at the upper right corner of the lens; the third photosensor 23 is installed at the lower left corner of the lens; and the fourth photosensor 24 is installed at the lower right corner of the lens.

[0055] Specifically, the light source working state detection system of the pixel projection headlight of the present embodiment can be applied to Figure 2 The pixel projection headlight shown in the figure comprises a first lens 11, a second lens 12, a third lens 13, a fourth lens 17, an LED module 14, a main control board 15, and a heat sink 16, wherein four light sensors of the present embodiment are installed on each of the first lens, the second lens 12, the third lens 13, and the fourth lens 17, and are configured as follows: Figure 5 The signal acquisition circuit shown in the figure. The light of the pixel projector headlight is emitted from the LED light source, processed by the lens assembly, and finally projected onto the target to complete the lighting task.

[0056] Specifically, a light source working state detection system of a pixel projection headlight of this embodiment is as follows: Figure 3 and Figure 4As shown, photosensitive sensors are installed at the four diagonal points of the lens. Combined with the imaging principle of the pixel projection headlight scanning control pixel LED lighting, the small, sensitive and programmable photosensitive sensor can collect light in the installation area and detect the periodic light state of the luminous area, and generate a periodic level signal through the signal acquisition circuit to the processor 26 for timing detection.

[0057] Furthermore, the photosensitive sensors of this embodiment are installed inside the imaging lens of the pixel projection headlight, and each photosensitive sensor is installed in a light shielding cap 241 that only responds to a specific area, which can avoid false triggering.

[0058] Furthermore, each photosensitive sensor of this embodiment collects light signals in a specific area, and amplifies the voltage signals through a signal acquisition circuit to generate a periodic level signal according to the on and off of the light, which is provided to the processor 26 for detection, and then the level period is read.

[0059] Furthermore, the control of LED pixels in a specific area of ​​the pixel projection headlight of the present embodiment is based on image information data fusion technology, which can support adjustable lighting cycles of LED pixels in a specific area without affecting the original projected imaging content.

[0060] Embodiment 2

[0061] like Figures 6-7 As shown, this embodiment provides a method for detecting the working state of a light source of a pixel projection headlight, which is applied to a light source working state detection system of a pixel projection headlight in Embodiment 1; the light source working state detection method comprises the following steps:

[0062] Step S1. The pixel projection headlight is turned on and an image is projected to a target location;

[0063] Step S2. The count value is initialized to 0, the photosensitive sensor collects the pixel period control signal generated by the pixel projection headlight projection image, and generates a corresponding level period and sends it to the light source working status detection module;

[0064] Step S3. The light source working state detection module determines whether the level cycles of the first photosensor 21 and the second photosensor 22 are the same; if so, the process proceeds to step S4; if not, the count value is increased by one and then the process proceeds to step S4;

[0065] Step S4. The light source working state detection module determines whether the level cycles of the first photosensor 21 and the third photosensor 23 are the same; if so, the process proceeds to step S5; if not, the count value is increased by one and then the process proceeds to step S5;

[0066] Step S5. The light source working state detection module determines whether the level cycles of the fourth photosensor 24 and the second photosensor 22 are the same; if so, the process proceeds to step S6; if not, the count value is increased by one and then the process proceeds to step S6;

[0067] Step S6. The light source working state detection module determines whether the level cycles of the fourth photosensor 24 and the third photosensor 23 are the same; if so, the process proceeds to step S7; if not, the count value is increased by one and then the process proceeds to step S7;

[0068] Step S7. Determine whether the count value is greater than 1. If so, proceed to step S8; if not, return to step S2;

[0069] Step S8. The light source working state detection module determines that the light source working state of the pixel projection headlight is abnormal.

[0070] Preferably, the frame rate of the image projected by the pixel-projected headlight in step S1 is 10 to 20 frames per second; and the level period generated by the photosensitive sensor in step S2 is 50 to 80 ms.

[0071] Preferably, in steps S3 to S6, the light source working status detection module identifies the frame rate matching degree of the projected image according to the level period of the photosensor, and determines whether the frame rate of the image projected by the pixel projection headlight is normal.

[0072] Specifically, in a method for detecting the working status of a pixel projection headlight, when the processor 26 detects the periodic level signal generated by the photosensitive sensor at regular intervals, it can determine whether the projection animation is frozen by identifying the matching degree of the projection imaging frame rate.

[0073] Specifically, a method for detecting the working status of a pixel projection headlight of the present embodiment integrates the periodic on and off signal of pixels in a specific area into the pixel headlight projection graphic data, generates projection symbol data and can also generate periodic control signals of the LED pixels in a specific area.

[0074] Specifically, a method for detecting the working status of a light source of a pixel projection headlight in this embodiment is based on the logic of installing four photosensitive sensors in the imaging lens of the pixel projection headlight for fault identification. According to the scanning principle of the pixel projection headlight from left to right and from top to bottom, taking the projection imaging frame rate of 15 frames / second as an example, the sensor generates a level cycle of 66.7ms.

[0075] Furthermore, after the pixel projection headlight starts working, the light source working status detection module periodically reads the level cycle of the first photosensor 21 for comparison with the level cycle of the second photosensor 22 to identify whether the image projected by the projection headlight is frozen horizontally and not updated.

[0076] Furthermore, the light source working state detection module also reads the level cycle of the first photosensor 21 for comparison with the level cycle of the third photosensor 23 or the fourth photosensor 24 to identify whether the image projected by the pixel headlight is frozen vertically and not updated.

[0077] The method for detecting the working status of a pixel projection headlight of the present embodiment can provide a low-cost, simple and reliable light source working status detection solution for existing pixel projection headlights to solve the problem of freezing of projection imaging of a 10,000-pixel high-resolution vehicle-mounted projection headlight in the projection area that is invisible to the driver.

[0078] Through the method for detecting the working status of the light source of a pixel projection headlight in this embodiment, the problem of freezing projection imaging of a high-resolution vehicle-mounted projection headlight with tens of thousands of pixels can be solved efficiently and accurately, thereby improving the product quality of the pixel projection headlight.

[0079] In another embodiment, the method is applied to scenarios such as user-defined projection icons and videos, projection turn signals, etc. when the vehicle with on-board pixel projection headlights is stopped or running.

[0080] The above is a detailed description of an embodiment of a light source working status detection system and method for a pixel projection headlight provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A light source working status detection system for a pixel projection headlight, characterized in that: include: A projection module, used to enable the pixel projection headlight to project an image and generate a corresponding pixel period control signal; A signal acquisition module, comprising a plurality of sensors; the plurality of sensors are evenly distributed and installed on the pixel projection headlight; the signal acquisition module is used to collect pixel point periodic control signals through the sensors, and generate corresponding level periods and send them to the light source working state detection module; The light source working state detection module is used to determine the light source working state of the pixel projection headlight according to the level cycle generated by the signal acquisition module.

2. The light source working status detection system according to claim 1, characterized in that: The signal acquisition module includes a plurality of photosensitive sensors; the pixel projection headlight includes a plurality of lenses; and each of the lenses is mounted with a plurality of the photosensitive sensors.

3. The light source working status detection system according to claim 2, characterized in that: The light-sensitive sensor comprises a light shielding cap (241) and a fixing column (242); one side of the fixing column (242) is fixedly mounted on the lens; and the light shielding cap (241) is mounted on the other side of the fixing column (242).

4. The light source working status detection system according to claim 3, characterized in that: The signal acquisition module also includes a signal acquisition circuit; the input end of the signal acquisition circuit is connected to the light shielding cap (241); and the output end of the signal acquisition circuit is connected to the light source working state detection module.

5. The light source working status detection system according to claim 4, characterized in that: The signal acquisition circuit comprises a first resistor, a second resistor, an amplifier (25), and an input voltage; the light source working state detection module comprises a processor (26); the input voltage is connected to the input end of the shading cap (241); the output end of the shading cap (241) is connected to the in-phase input end of the amplifier (25); the node between the shading cap (241) and the in-phase input end of the amplifier (25) is connected to one end of the first resistor; the other end of the first resistor is grounded; the reverse input end of the amplifier (25) is connected to one end of the second resistor; the other end of the second resistor is grounded; and the output end of the amplifier (25) is connected to the processor (26).

6. The light source working status detection system according to claim 2, characterized in that: The projection module includes a light switch submodule and an imaging submodule; The switch light submodule is used to control the pixel projection headlight to turn on or off; The imaging submodule is used to form an image and project it through the pixel projection headlight.

7. The light source working state detection system according to any one of claims 2 to 6, characterized in that: The multiple photosensors include a first photosensor (21), a second photosensor (22), a third photosensor (23), and a fourth photosensor (24); the first photosensor (21) is installed at the upper left corner of the lens; the second photosensor (22) is installed at the upper right corner of the lens; the third photosensor (23) is installed at the lower left corner of the lens; and the fourth photosensor (24) is installed at the lower right corner of the lens.

8. A method for detecting the working state of a light source of a pixel projection headlight, characterized in that: A light source working state detection system for a pixel projection headlight as claimed in claim 7; the light source working state detection method comprises the following steps: Step S1. The pixel projection headlight is turned on and an image is projected to a target location; Step S2. The count value is initialized to 0, the photosensitive sensor collects the pixel period control signal generated by the pixel projection headlight projection image, and generates a corresponding level period and sends it to the light source working status detection module; Step S3. The light source working state detection module determines whether the level cycles of the first photosensor and the second photosensor are the same; if so, the process proceeds to step S4; if not, the count value is increased by one and then the process proceeds to step S4; Step S4. The light source working state detection module determines whether the level cycles of the first photosensor and the third photosensor are the same; if so, the process proceeds to step S5; if not, the count value is increased by one and then the process proceeds to step S5; Step S5. The light source working state detection module determines whether the level cycles of the fourth photosensor and the second photosensor are the same; if so, the process proceeds to step S6; if not, the count value is increased by one and then the process proceeds to step S6; Step S6. The light source working state detection module determines whether the level cycles of the fourth photosensor and the third photosensor are the same; if so, the process proceeds to step S7; if not, the count value is increased by one and then the process proceeds to step S7; Step S7. Determine whether the count value is greater than 1. If so, proceed to step S8; if not, return to step S2; Step S8. The light source working state detection module determines that the light source working state of the pixel projection headlight is abnormal.

9. The method for detecting the working state of a light source according to claim 8, characterized in that: In the step S1, the frame rate of the image projected by the pixel projection headlight is 10 to 20 frames per second; and in the step S2, the level cycle generated by the photosensitive sensor is 50 to 80 ms.

10. The method for detecting the working state of a light source according to claim 8, characterized in that: In the steps S3 to S6, the light source working state detection module identifies the frame rate matching degree of the projected image according to the level cycle of the photosensor, and determines whether the frame rate of the image projected by the pixel projection headlight is normal.

Images