Independent addressing method based on dot matrix LED lighting light field

Abstract

The present invention discloses a control method for independently addressing each LED in an LED array in a ground lighting field by acquiring the position h and deflection angle θ of a dot matrix LED headlight. First, by collecting a large number of data on the distance d between the headlight and the projection screen and the width L of the corresponding lighting light field range, the emission angle of the lighting light field of the dot matrix LED headlight is determined by data fitting. Then, the constructed headlight test bench is theoretically mathematically derived, and the position of each row of the dot matrix LED headlight on the ground is determined by combining the emission angle obtained by collecting a large number of experimental data, the height h of the dot matrix LED headlight from the ground, and the deflection angle θ of the dot matrix LED headlight. Finally, each row is expanded by column to determine the mapping address of each LED in the dot matrix LED headlight in the ground lighting area. Finally, the address of each LED light point in the corresponding lighting light field area is printed out through MATLAB, and the accuracy and effectiveness of the method are verified by experiments.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile lamp lighting, and is based on an independent addressing method for a dot matrix LED automobile lamp lighting light field. Background Art

[0002] The emergence of cars has brought great convenience to people's traffic conditions and lifestyles. With the continuous development of science and technology and the increasing level of people's living consumption, the number of cars has increased year by year; relevant statistics show that cars have become the world's largest consumer product. However, with the increasing popularity of cars as a means of transportation, the occurrence of traffic accidents has also increased exponentially. Although relevant traffic laws and regulations and security systems have been introduced, traffic safety accidents still occur from time to time in daily life. Among these large numbers of traffic accidents, about one-third occur at night. The main reason for the frequent occurrence of nighttime traffic accidents is the poor driving environment at night and the unclear driving vision of the driver. It is necessary to combine the current driving conditions of the night-time driving vehicle and the driving conditions and lighting use of the oncoming vehicles with the current environmental road conditions to comprehensively judge the specific conditions for the next step of driving, so as to avoid the possibility of traffic accidents. As a device that can greatly improve the driver's driving conditions at night, the automobile headlight system is an indispensable part of the driver's night driving safety.

[0003] The problems of traditional automobile headlight lighting systems include: the accuracy of its operation largely depends on the driver's attention and experience, which can easily induce safety hazards; the lighting field is single in form, and the high beam is easy to dazzle oncoming vehicles during driving, causing serious traffic accidents. The advantage of the new generation of smart headlights is that they can use the ADAS system in real time to perceive the surrounding environmental factors and design a lighting field that meets user needs; the lighting field is composed of thousands of high-brightness LEDs, which can be adjusted freely and the lighting methods are flexible and diverse; LEDs have a long service life and are energy-saving, environmentally friendly, and power-saving; they greatly improve the driver's night driving conditions and improve driving safety and comfort.

[0004] Research shows that the new generation of projection lights can adjust their lighting status according to the characteristics of driving road conditions, avoiding providing a narrow lighting area for the driver, and preventing the intersection of headlights from other vehicles meeting or following the driver, causing visual dazzle to the driver, so that the driver can correctly control the car to avoid traffic hazards.

[0005] Based on this need, a set of intelligent car light control methods that can be independently addressed in the lighting area is designed to achieve flexible and precise adjustment of the lighting light field. Summary of the invention

[0006] The purpose of this invention is to propose a method for independent addressing of the illumination light field of a dot matrix LED headlight, so as to

[0007] The invention solves the problems raised in the above background technology.

[0008] In order to achieve the above purpose, the present invention adopts the following technical solution:.

[0009] Step 1: Collect data. By collecting the distance d between the projection screen and the test bench and the side length L of the corresponding projection illumination area, and fitting the data, the corresponding functional relationship between the two is obtained as follows:

[0010] L=0.1188d-0.7369

[0011] (Note: -0.7369 in this formula is the error in engineering measurement, such as lens error, offset of actual measurement position, etc.), and then combined with the geometric relationship of light field illumination, the emission angle of the dot matrix LED is determined. for:

[0012]

[0013] θ=arctan(0.1188 / 2)

[0014] Step 2: Theoretical mathematical derivation, combined with the height h of the dot matrix LED lights and the deflection angle θ of the dot matrix LED lights, first determine the position of each row of the dot matrix LED lights in the ground lighting area:

[0015] x=htan[(86.601-θ)+(6.7987 / 31)*n1]n1∈[0,15+θ / (6.799 / 31)]

[0016] Then expand it by column to determine the mapping address of each LED in the dot matrix LED headlight in the ground lighting area;

[0017]

[0018] Step 3: Experimental verification: print out the address of each LED light spot in the corresponding illumination light field area through MATLAB, and verify it through experiments;

[0019] As a further solution of the present invention, in step 1, data collection adopts a real-time measurement method to ensure the validity and accuracy of the data. When performing data fitting, MATLAB toolbox is used to perform data fitting to ensure the validity and accuracy of data fitting.

[0020] As a further solution of the present invention, in the theoretical mathematical derivation part of step 2, after first determining the position of the row, each row is expanded by column to determine the mapping address of each LED in the LED array in the lighting area space;

[0021] As a further solution of the present invention, in step three, the proposed control method for determining the mapping address of each LED in the LED array in the lighting area space is verified on a test bench to ensure the effectiveness and accuracy of the control method.

[0022] The beneficial effects of the present invention are as follows:

[0023] By obtaining the position and deflection angle of the vehicle lights, each LED in the LED array can be independently addressed in the ground lighting area.

[0024] By establishing this addressing method, the width and narrowness of the lighting area can be adjusted dynamically in real time, laying a solid technical foundation for flexibly adjusting the area of ​​the entire lighting field. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a spatial modeling coordinate diagram of the present invention.

[0026] Figure 2 is a functional block diagram of an embodiment of the present invention.

[0027] Figure 3-1 The mapping address dot matrix diagram printed out by the present invention is projected onto a plane parallel to the dot matrix LED lamp.

[0028] Figure 3-2 The dot matrix map of the mapping address of the dot matrix LED car light printed out by the present invention is projected onto the ground at a certain deflection angle

[0029] Figure 4-1 The zebra crossing image is printed out by tracing points according to the present invention.

[0030] Figure 4-2 This is the zebra crossing image actually output by the test bench of the present invention. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below with reference to the accompanying drawings.

[0032] Figure 1 In the figure, E is the LED dot matrix light source on the test bench, and the area where ABCD is located is the lighting area where the car lights are projected onto the ground. The mapping coordinates of the entire dot matrix are all contained in the lighting area surrounded by ABCD.

[0033] The present invention proposes a method for screening target headlight light source position data based on nighttime driving environment, and its functional block diagram is as follows: Figure 2 As shown, the following steps are included:

[0034] Step 1: Collect data. By collecting the distance d between the projection screen and the test bench and the side length L of the corresponding projection illumination area, and fitting the data, the corresponding function relationship is obtained as follows:

[0035] L=0.1188d-0.7369

[0036] (Note: -0.7369 in this formula is the error in engineering measurement, such as lens error, offset of actual measurement position, etc.), and then combined with the geometric relationship of light field illumination, the emission angle of the dot matrix LED is determined. for:

[0037]

[0038] θ=arctan(0.1188 / 2)

[0039] Step 2: Theoretical mathematical derivation, combining the height h of the dot matrix LED headlight, the deflection angle θ of the dot matrix LED headlight and the emission angle of the dot matrix LED headlight obtained by data fitting above First determine the position of each row of dot matrix LED lights in the ground lighting area:

[0040] x=htan[(86.601-θ)+(6.7987 / 31)*n1]n1∈[0,15+θ / (6.799 / 31)]

[0041] Then expand it by column to determine the mapping address of each LED in the dot matrix LED headlight in the ground lighting area;

[0042]

[0043] Step 3: Experimental verification: print out the address of each LED light spot in the corresponding illumination light field area through MATLAB, and verify it through experiments;

[0044] The present invention provides a method for independent addressing of the illumination light field based on dot matrix LED headlights. Compared with the prior art, the present invention realizes independent addressing of each LED in the LED array in the ground illumination area by obtaining the position and deflection angle of the headlights. By establishing the addressing method, the width and narrowness of the illumination area can be adjusted dynamically in real time, laying a solid technical foundation for flexibly adjusting the area of ​​the entire illumination field.

Claims

1. A method for independent addressing of a dot matrix LED headlight illumination light field, characterized in that: The following steps are involved: Step 1: Collect data: By collecting the distance d between the projection screen and the test bench and the corresponding side length L of the projection illumination area, and fitting the data, the corresponding functional relationship between the two is obtained as follows: L=0.1188d-0.7369 Note: -0.7369 in this formula is the error in engineering measurement: lens error, the offset of the actual measurement position, combined with the geometric relationship of the light field irradiation, determines the emission angle of the dot matrix LED for: θ=arctan(0.1188 / 2) Where θ is the deflection angle; Step 2: Theoretical mathematical derivation: Combined with the height h of the dot matrix LED headlights and the deflection angle θ of the dot matrix LED headlights, the position of each row of the dot matrix LED headlights in the ground lighting area is first determined: x=htan[(86.601-θ)+(6.7987 / 31)*n1]n1∈[0,15+θ / (6.799 / 31)] Then expand it by column to determine the mapping address of each LED in the dot matrix LED headlight in the ground lighting area; Step 3: Experimental verification: The address of each LED light spot in the corresponding illumination light field area is printed out through MATLAB and verified through experiments.

2. The method for independent addressing of the dot matrix LED vehicle lighting light field according to claim 1, characterized in that: The data collection in step one is achieved through manual actual measurement.

3. The method for independent addressing of the dot matrix LED vehicle lighting light field according to claim 1, characterized in that: The theoretical mathematical derivation of step 2 is combined with the actual measured data, and a suitable mathematical modeling method is used to model the lighting scene of the dot matrix LED headlights to determine the mapping address of each LED in the dot matrix LED array in the entire lighting area.

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