CN-122008856-A - Vehicle HUD system and method based on flexible OLED screen

CN122008856ACN 122008856 ACN122008856 ACN 122008856ACN-122008856-A

Abstract

The invention discloses a vehicle HUD system and method based on a flexible OLED screen, and relates to the field of flexible OLED screens, wherein the acquisition module is used for constructing a continuous mathematical model of a glass curved surface through B-spline surface fitting based on a glass surface scanning point cloud, synchronously acquiring curvature and control point parameters, and the curvature parameters are used for identifying a region with severe curvature change of the glass curved surface and adaptively inserting additional control points; and the dividing module is used for defining a virtual ideal display plane based on the visual characteristics of human eyes and dividing the differential area grid according to the visual resolution standard of human eyes. According to the invention, the natural fitting view of the display content is realized by precisely fitting the glass curved surface, adapting the human eye visual characteristic to divide the grids and combining the light propagation path optimization and the dynamic deviation compensation, meanwhile, the flicker artifact is avoided by color fusion and smoothing processing, the posture change of the driver is adapted in real time, the visual fatigue is effectively reduced, and the accuracy and the safety of information acquisition in the driving process are greatly improved.

Inventors

Huang Aowen
YANG HUOFENG
LENG WENLIANG
LI YING

Assignees

武汉江夏楚能汽车技术研发有限公司

Dates

Publication Date: 20260512
Application Date: 20260228

Claims (10)

1. A vehicle HUD system based on a flexible OLED screen, comprising: The acquisition module is used for constructing a continuous mathematical model of the glass curved surface through B spline surface fitting based on the glass surface scanning point cloud, and synchronously acquiring curvature and control point parameters, wherein the curvature parameters are used for identifying a region with severe curvature change of the glass curved surface and adaptively inserting additional control points; the dividing module is used for defining a virtual ideal display plane based on human eye visual characteristics, dividing differential area grids according to human eye visual resolution standards, and forming virtual plane feature point space coordinates of density differential distribution; The compensation module is used for constructing a calibration parameter set through rigid transformation and control point offset based on the model and the control point parameters output by the acquisition module and dynamically correcting the model by combining the environmental sensor data to obtain a calibrated digital twin model; the positioning module is used for adapting the inherent curvature characteristic of the windshield by taking the calibrated digital twin model output by the compensation module and the curvature parameter output by the acquisition module as core basis, combining the eye point coordinates of a driver and the characteristic point coordinates output by the division module, reversely tracking the path of light rays refracted by glass, solving the corresponding luminous pixel coordinates of a screen, and forming a mapping relation between the virtual plane characteristic points and the screen pixels; The processing module is used for receiving the mapping relation output by the positioning module, defining a mapping scene of a single screen pixel corresponding to a plurality of virtual plane feature points, setting a three-layer weight model, and performing color fusion and smoothing on the mapping and boundary areas from many to one to generate optimized display data; the updating module is used for collecting the position of the eyes of the driver and the parameters of the seat, dynamically updating the model correction parameters of the compensation module, the path calculation parameters of the light rays refracted by the glass of the positioning module, the density distribution of the differential area grid of the dividing module and the weight coefficient of the three-layer weight model of the processing module, and adapting to the change of the posture of the driver.
2. The vehicle HUD system based on a flexible OLED screen according to claim 1, wherein the obtaining module obtains complete glass surface point cloud data through glass surface scanning in a design stage, and uses the point cloud data as a basic input of B-spline surface fitting; in the fitting process, an algorithm automatically identifies a region with severe curvature change of the glass surface according to curvature parameters, and an additional control point is adaptively inserted into the region, so that a continuous mathematical model of the glass curved surface formed by fitting meets a tiny continuity requirement in a segmented interval defined by a node vector; And the curvature parameter is used as an intrinsic attribute of the fitted continuous mathematical model of the glass curved surface and is directly extracted from the model synchronously.
3. The vehicle HUD system based on a flexible OLED screen according to claim 1, wherein the dividing module defines a virtual ideal display plane based on a differentiated characteristic of a visual resolution of human eyes, and mathematically defines the virtual ideal display plane by a preset spatial position parameter and a direction parameter; In the grid division process of the differential area, the grid density of the central concave visual area of the corresponding human eye is higher than that of the peripheral visual area, and the space coordinates of the virtual plane characteristic points are determined through the vertex positioning of the grid unit.
4. The vehicle HUD system based on a flexible OLED screen of claim 1, wherein the process of the positioning module tracking the light propagation path in reverse comprises the steps of: calculating an ideal light ray direction pointing to the virtual plane feature point from the driver's eye point according to the driver's eye point coordinate and the virtual plane feature point coordinate; Solving the intersection point of the ideal light and the calibrated digital twin model; calculating the glass normal vector of the point based on the first-order partial derivative of the curved surface at the intersection point, and reversely deducing the incident ray direction of the ray from the screen to the intersection point by combining the refractive index parameters of the glass and the air; and calculating an intersection point of the incident light and the screen plane according to a preset OLED screen plane equation, wherein the intersection point is the screen pixel coordinate of the corresponding virtual plane characteristic point.
5. The vehicle HUD system based on a flexible OLED screen according to claim 1, wherein the calibration parameter set of the compensation module includes a rigid transformation parameter and a deformation correction parameter; The rigidity transformation parameters are composed of a rotation matrix and a translation vector and are used for correcting position deviation and angle deviation generated in the installation process, the deformation correction parameters are the offset of control points used for B spline surface fitting and are used for compensating the shape deviation of the curved surface generated in the manufacturing process; In the dynamic correction process, environmental data are collected in real time through a temperature sensor and a stress sensor, a dynamic deformation field is constructed by combining calibration experimental results which are finished in advance under various environmental conditions, and the dynamic deformation field is superimposed into a calibrated digital twin model to form a real-time corrected operation model.
6. The vehicle HUD system based on the flexible OLED screen according to claim 1, wherein in the three-layer weight model of the processing module, the content importance weight is comprehensively determined based on the visual saliency, the safety criticality and the navigation priority of the display content, and the display priorities of different types of content are balanced through a preset weight coefficient distribution rule; the space distance weight is dynamically adjusted according to the continuous coordinates mapped by the virtual plane feature points and the actual distance of the screen pixels, so that the contribution ratio of the virtual plane feature points with closer distances to the color of the screen pixels is higher; and for a many-to-one mapping scene in which a plurality of virtual plane feature points are mapped to the same screen pixel, screening and reserving a preset number of virtual plane feature points with optimal comprehensive weights through a priority queue, and participating in color fusion calculation of the screen pixel only based on the preset number of virtual plane feature points with optimal comprehensive weights to generate optimized display data.
7. The vehicle HUD system based on a flexible OLED screen of claim 1, wherein the processing module applies a smooth transition function to the processing of the border region: Defining boundaries of different visual areas through a symbol distance function, calculating distance parameters from virtual plane feature points to the boundaries of the areas, and substituting the distance parameters into a smooth transition function to obtain boundary weights; For the virtual plane feature points which are mapped to the same screen pixel and are respectively distributed on two sides of the boundary, the color contributions of the virtual plane feature points are smoothly mixed according to the weight of the boundary, so that the transition between different visual areas is natural without artifacts; the processing module is further used for processing a pair of zero mapping scenes with virtual plane feature point mapping coordinates outside the OLED screen display area, and diffusing color information and weight parameters of the virtual plane feature points to the nearest preset number of effective pixels in the display area based on an inverse distance weight rule.
8. The vehicle HUD system based on the flexible OLED screen according to claim 1, wherein the updating module obtains the seat adjustment parameter and the body posture parameter of the driver in real time through the seat position and the sitting height detection sensor, and performs a comparative analysis on the sitting height of the vehicle design position and the actual sitting height and the actual position of the driver in combination with a preset eyepoint calculation logic to determine the real-time driver eyepoint position; and dynamically updating the mapping relation among the ideal light direction, the light refraction path and the screen pixel coordinates according to the position of the eye point of the driver in real time, and synchronously adjusting the density distribution and the weight coefficient of the visual grid in the display parameters.
9. The vehicle HUD system based on the flexible OLED screen, as set forth in claim 1, is characterized in that the flexible OLED screen and the front windshield of the automobile are designed in an integrated coupling way, the screen is attached to the inner side of the front windshield, and the screen is connected with the vehicle electronic framework through standardized power supply pins, signal pins and control pins; the acquisition module is interactively connected with the dividing module and the positioning module through a wireless network, the positioning module is interactively connected with the compensation module and the processing module through the wireless network, and the processing module is interactively connected with the updating module through the wireless network.
10. A method of a flexible OLED screen based vehicle HUD applied to a flexible OLED screen based vehicle HUD system according to any of claims 1 to 9, comprising the steps of: S1, constructing a continuous mathematical model of a glass curved surface through B spline surface fitting based on a glass surface scanning point cloud, synchronously extracting curvature parameters and adaptively inserting control points; s2, defining a virtual ideal display plane based on human eye visual characteristics, dividing differential area grids of the density distribution according to human eye resolution difference, and generating virtual plane feature point coordinates; s3, constructing a calibration parameter set by combining rigid transformation and control point offset based on the model and parameters output in the step S1, and dynamically correcting the model by combining the environmental sensor data to form a calibrated digital twin model; s4, based on the calibrated digital twin model and curvature parameters, combining the coordinates of the eye points of the driver and the coordinates of the characteristic points of the virtual plane, reversely tracking the refraction path of the light, solving the coordinates of the luminous pixels of the screen, and establishing a mapping relation between the characteristic points and the pixels; s5, performing color fusion and smoothing processing on the multi-to-one mapping and boundary region by using a three-layer weight model according to the mapping relation, and generating optimized display data; s6, collecting the position of the driver' S eyepoint and the seat parameters in real time, dynamically updating the model correction parameters, the ray tracing parameters, the grid density distribution and the weight coefficients, and adapting to the posture change of the driver.

Description

Vehicle HUD system and method based on flexible OLED screen Technical Field The invention relates to the technical field of flexible OLED screens, in particular to a vehicle HUD system and method based on a flexible OLED screen. Background As a key configuration for improving driving convenience and safety, an automotive head-up display (HUD) technology has been widely used in industry, and conventional ARHUD and PHUD mainly rely on precise optical elements and complex mechanical structures to construct an optical path, so as to realize the function of projecting information such as navigation and warning to the field of view of a driver. With the development of display technology and material science, novel light-transmitting display materials such as flexible OLED gradually become a preferred scheme for coupling design with front windshield glass of an automobile by virtue of the characteristics of ultra-thin (the thickness can reach nano level) and high light transmittance, and the industry gradually explores mathematical modeling and image processing technologies such as predistortion treatment, inverse ray tracing, virtual plane modeling and the like to try to compensate deviation in an optical path, optimize display effect and promote the HUD technology to develop towards a more compact and integrated direction. However, the vehicle HUD adopting the coupling design of the flexible OLED screen and the windshield glass faces a core technical problem that because the screen installation position and the sight line of a driver form an acute angle, the inherent curvature of the windshield glass is superimposed, optical problems such as perspective distortion and shape distortion are easily caused, and in addition, the drivers with different body types and sitting postures have eye point position difference, the prior art is difficult to accurately compensate the optical distortion while adapting to the needs of diversified drivers, the physical correct perspective relationship and boundary continuity cannot be realized, and finally, the visual experience of the drivers is poor and visual fatigue is easily caused. Therefore, there is a need for a vehicle HUD system and method based on a flexible OLED screen to solve the above technical problems. Disclosure of Invention Aiming at the defects in the prior art, the invention provides a vehicle HUD system and a vehicle HUD method based on a flexible OLED screen, which can effectively solve the problems in the prior art. In order to achieve the above object, the present invention is achieved by the following technical scheme; The invention discloses a vehicle HUD system based on a flexible OLED screen, which is characterized by comprising: The acquisition module is used for constructing a continuous mathematical model of the glass curved surface through B spline surface fitting based on the glass surface scanning point cloud, and synchronously acquiring curvature and control point parameters, wherein the curvature parameters are used for identifying a region with severe curvature change of the glass curved surface and adaptively inserting additional control points; the dividing module is used for defining a virtual ideal display plane based on human eye visual characteristics, dividing differential area grids according to human eye visual resolution standards, and forming virtual plane feature point space coordinates of density differential distribution; The compensation module is used for constructing a calibration parameter set through rigid transformation and control point offset based on the model and the control point parameters output by the acquisition module and dynamically correcting the model by combining the environmental sensor data to obtain a calibrated digital twin model; the positioning module is used for adapting the inherent curvature characteristic of the windshield by taking the calibrated digital twin model output by the compensation module and the curvature parameter output by the acquisition module as core basis, combining the eye point coordinates of a driver and the characteristic point coordinates output by the division module, reversely tracking the path of light rays refracted by glass, solving the corresponding luminous pixel coordinates of a screen, and forming a mapping relation between the virtual plane characteristic points and the screen pixels; The processing module is used for receiving the mapping relation output by the positioning module, defining a mapping scene of a single screen pixel corresponding to a plurality of virtual plane feature points, setting a three-layer weight model, and performing color fusion and smoothing on the mapping and boundary areas from many to one to generate optimized display data; the updating module is used for collecting the position of the eyes of the driver and the parameters of the seat, dynamically updating the model correction parameters of the compensation module, the path calculation pa