A method and system for analyzing stray light of a HUD dust shield

Abstract

This invention provides a method for stray light analysis of HUD dustproof panels, comprising the following steps: Step 1: Light source modeling; Step 2: Input of analog and digital data and setting of component characteristics; Step 3: Setting of the light source; Step 4: Simulation and analysis of stray light. This invention employs optical analysis technology combined with Lighttools optical software. This method, with its high efficiency and speed, provides a simple and convenient approach for accurate analysis of stray light from HUD dustproof panels. Its main purpose is to ensure that the HUD system can continuously provide a high level of display performance, thereby significantly improving the system's reliability and stability.

Description

Technical Field

[0001] This invention belongs to the technical field of HUD dustproof panels, and particularly relates to a method and system for analyzing stray light from HUD dustproof panels. Background Technology

[0002] In the automotive industry, the application of head-up display (HUD) technology has become an important component of vehicle intelligence and safety. HUD systems project vehicle information, such as speed, navigation information, and warnings, onto a transparent screen within the driver's field of vision, allowing the driver to maintain focus on the road while obtaining necessary information.

[0003] However, in practical applications, HUD systems can be affected by stray light, especially scattering from ambient light and vehicle headlights. This stray light can cause reflections, interference, and glare on the display screen, reducing the visibility and readability of the HUD system and negatively impacting the driver's experience and safety. Therefore, it is crucial to analyze the causes of stray light from the dust cover and the light path it takes during the design phase, and to adjust the design accordingly to mitigate its impact.

[0004] Currently, there are limited reports on methods for analyzing stray light from dust filters in HUD systems. Different companies use different and complex methods, and traditional lens design-based analysis methods are not applicable to HUD systems. Summary of the Invention

[0005] To address the shortcomings of the aforementioned technologies, the purpose of this invention is to provide a simple and efficient analysis method. This invention aims to utilize advanced optical analysis techniques combined with Lighttools optical software to quickly and accurately analyze stray light from the HUD dust filter, ensuring continuous high-quality display and improving reliability and stability.

[0006] This invention relates to a stray light analysis method for HUD dustproof panels. It mainly utilizes the optical software Lighttools to analyze the stray light of the dustproof panel, enabling accurate and rapid analysis of stray light in the HUD dustproof panel and improving design efficiency. The main steps include: modeling, component characteristic setting, simulation, and simulation result analysis.

[0007] The stray light analysis method for HUD dustproof panels proposed in this invention includes the following steps:

[0008] Step 1: Light source modeling;

[0009] Step 2: Inputting digital-analog data and setting component characteristics;

[0010] Step 3: Set the light source;

[0011] Step 4: Simulation and analysis of stray light.

[0012] In this invention, the light source modeling includes the following sub-steps:

[0013] Step 11: Model the position of the simulated light source in the 3D software CATIA, determine the location of the simulated light source, and set the position reference for the light source in the Light Tools software;

[0014] Step 12: Set up two light-blocking structures for the eye box, one to block the light from above the eye box and the other to block the light from behind the eye box;

[0015] Step 13: Modeling the position of the light source: Based on the dimensions of the windshield, dust cover, and light outlet, and the principle that light travels in a straight line, draw the upper and lower boundary rays of the light source. Connect these two rays and stretch them along the direction of the windshield to create a plane whose width can cover the windshield surface. This plane serves as the reference surface for simulating the position of the light source.

[0016] In this invention, the input of the digital-analog data and the setting of the component characteristics include the following sub-steps:

[0017] Step 21: Import the established simulated light source position and light-blocking plate, along with other components, into Lighttools and configure their various optical properties. The property settings for each component are as follows:

[0018] The following settings should be made for the above digital model data in the Lighttools software:

[0019] Windshield: 15% reflectivity, 85% transmittance;

[0020] Light outlet: optical absorption;

[0021] Dustproof panel: 15% reflectivity, 85% transmittance;

[0022] The receiver is located in the eye box: its size is 300*300mm;

[0023] Eye box: 100% transmittance;

[0024] Light-blocking structure: optical absorption.

[0025] In this invention, setting the light source includes the following sub-steps:

[0026] Step 31: Recreate a rectangular light source at the location of the simulated light source that completely coincides with the reference plane at the location, including the same size and angle;

[0027] Step 32: Set the rectangular light source characteristics to Lambertian light source, with the spectrum set to default; set the lower angle to 90 degrees;

[0028] Step 33: Place the receiver at the eye box, and set the receiver size to 300*300mm.

[0029] In this invention, the simulation and analysis of stray light includes the following sub-steps:

[0030] Step 41: Run the Lighttools software to start the light simulation, open the forward illuminance analysis function, and use the area light analysis function to select the area with illuminance on the illuminance map;

[0031] Step 42: Observe the path of light propagation. Determine whether the light enters the eye box through the windshield dust cover. If so, it indicates that there is stray light from the dust cover, and the dust cover needs to be adjusted.

[0032] Based on the above methods, the present invention also proposes a stray light analysis system for HUD dustproof panels, comprising: a memory and a processor; the memory stores a computer program, and when the computer program is executed by the processor, the above-described method is implemented.

[0033] The present invention also proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-described method.

[0034] This invention employs optical analysis technology combined with Lighttools optical software. This method, characterized by its high efficiency and speed, provides a simple and convenient approach for the accurate analysis of stray light from HUD dust filters. Its main purpose is to ensure that the HUD system can consistently deliver a high level of display performance, thereby significantly improving the system's reliability and stability. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram showing the location of the light-blocking structure.

[0037] Figure 2 This is a diagram simulating the position of the light source.

[0038] Figure 3 This is a diagram simulating the position of the light source.

[0039] Figure 4 This is the illuminance diagram in the embodiment.

[0040] Figure 5 This is a light propagation path diagram without stray light in the embodiment.

[0041] Figure 6 This is the light propagation path in the embodiment, which contains stray light. Detailed Implementation

[0042] The invention will be further described in detail below with reference to the specific embodiments and accompanying drawings. Except for the contents specifically mentioned below, the processes, conditions, and experimental methods for implementing the invention are all common knowledge and general knowledge in the art, and the invention does not have any particular limitations.

[0043] The stray light analysis method for the HUD dustproof panel in this embodiment includes the following steps:

[0044] Step 1: Light source modeling; specifically,

[0045] When analyzing stray light from the HUD dust cover, the main 3D data components required are the windshield, dust cover, dust cover light outlet, and center lens box. In this embodiment, the car manufacturer provided data for all components except the dust cover, which can be used directly; the dust cover itself needs to be drawn.

[0046] The simulated light source needs to be modeled in the 3D software CATIA to determine its location, and then the position reference for the light source needs to be set in the Light Tools software.

[0047] like Figure 1 and Figure 2 As shown, the principle followed in modeling the position of the light source is to draw the upper and lower boundary rays of the light source based on the dimensions of the windshield, dust cover, and light outlet, as well as the principle that light travels in a straight line. Connect these two rays and stretch them along the direction of the windshield to create a plane whose width can cover the windshield surface. This plane serves as the reference plane for simulating the position of the light source.

[0048] In addition, two light-blocking structures should be installed on the eye box to prevent or reduce the direct entry of simulated light sources into the eye box. One light-blocking structure blocks the light from above the eye box, and the other blocks the light from behind the eye box. (Refer to...) Figure 1 .

[0049] Step 2: Inputting digital-analog data and setting component characteristics; specifically,

[0050] Import the simulated light source position and light-blocking plate established in step 1, along with other components, into Lighttools, and set various optical characteristics. The characteristic settings for each component are as follows:

[0051] The following general settings should be made for the above digital model data in the Lighttools software:

[0052] Windshield: 15% reflectivity, 85% transmittance;

[0053] Light outlet: optical absorption;

[0054] Dustproof panel: 15% reflectivity, 85% transmittance;

[0055] The receiver is located in the eye box: its size is 300*300mm;

[0056] Eye box: 100% transmittance;

[0057] Light-blocking structure: optical absorption.

[0058] Step 3: Set the light source; specifically,

[0059] Recreate a perfectly overlapping rectangular light source at the location of the simulated light source, ensuring identical size and angle. Set the rectangular light source characteristics to a Lambertian light source with the default spectrum. Set the down angle to 90 degrees. Place the receiver at the eye box, setting its dimensions to 300*300mm.

[0060] Step 4: Simulation and analysis of stray light; specifically,

[0061] After all component properties are set, run the LightTools software to start the ray simulation, open the forward illuminance analysis function, and use the area ray analysis function to select the area with illuminance on the illuminance map, such as... Figure 4 The blue area shown has zero illuminance; the areas with illuminance are all other areas except the blue area. Observe the light propagation path to determine whether the light enters the eye box through the windshield dust cover. If so, it indicates stray light from the dust cover, and the dust cover needs adjustment. Figure 5 The image shows light entering the eye box without passing through the dustproof panel, resulting in stray light without the dustproof panel.

[0062] Figure 6 The image shows stray light with a dustproof panel. Some light passes through the windshield, is reflected by the dustproof panel, and then enters the eye box, producing stray light.

[0063] The scope of protection of this invention is not limited to the above embodiments. Any variations and advantages that can be conceived by those skilled in the art without departing from the spirit and scope of the inventive concept are included in this invention and are protected by the appended claims.

Claims

1. A method for analyzing stray light from a HUD dustproof panel, characterized in that, Includes the following steps: Step 1: Light source modeling; Step 2: Inputting digital-analog data and setting component characteristics; Step 3: Set the light source; Step 4: Simulation and analysis of stray light.

2. The stray light analysis method for the HUD dustproof panel as described in claim 1, characterized in that, The light source modeling includes the following sub-steps: Step 11: Model the position of the simulated light source in the 3D software CATIA, determine the location of the simulated light source, and set the position reference for the light source in the Light Tools software; Step 12: Set up two light-blocking structures for the eye box, one to block the light from above the eye box and the other to block the light from behind the eye box; Step 13, Light Source Position Modeling: Based on the dimensions of the windshield, dust cover, and light outlet, and the principle that light travels in a straight line, draw the upper and lower boundary rays of the light source. Connect these two rays and stretch them along the direction of the windshield to create a plane whose width can cover the windshield surface. This plane serves as the reference surface for simulating the position of the light source.

3. The stray light analysis method for the HUD dustproof panel as described in claim 1, characterized in that, The input of the digital-analog data and the setting of the component characteristics include the following sub-steps: Step 21: Import the established simulated light source position and light-blocking plate, along with other components, into Lighttools and set various optical properties; the general property settings for each component are as follows: The following general settings should be made for the above digital model data in the Lighttools software: Windshield: 15% reflectivity, 85% transmittance; Light outlet: optical absorption; Dustproof panel: 15% reflectivity, 85% transmittance; The receiver is located in the eye box: its size is 300*300mm; Eye box: 100% transmittance; Light-blocking structure: optical absorption.

4. The stray light analysis method for the HUD dustproof panel as described in claim 1, characterized in that, Setting the light source includes the following sub-steps: Step 31: Recreate a rectangular light source at the location of the simulated light source that is completely aligned with the position reference plane, including its size and angle; Step 32: Set the rectangular light source characteristics to Lambertian light source, with the spectrum set to default; set the lower angle to 90 degrees; Step 33: Place the receiver at the eye box, and set the receiver size to 300*300mm.

5. The stray light analysis method for the HUD dustproof panel as described in claim 1, characterized in that, The simulation and analysis of stray light includes the following sub-steps: Step 41: Run the Lighttools software to start the light simulation, open the forward illuminance analysis function, and use the area light analysis function to select the area with illuminance on the illuminance map; Step 42: Observe the path of light propagation. Determine whether the light enters the eye box through the windshield dust cover. If so, it indicates that there is stray light from the dust cover, and the dust cover needs to be adjusted.

6. A stray light analysis system for a HUD dustproof panel, characterized in that, include: Memory and processor; The memory stores a computer program that, when executed by the processor, implements the method as described in any one of claims 1-5.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-5.

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