Method of displaying information on vehicle windscreen

FIELD: physics.

SUBSTANCE: method involves image preprocessing using a video processor 13 to eliminate geometric distortions, resulting from the geometry of the optical system; formation of an image of the cabin space on a monitor screen 1 and projection using a reproduction lens 2 onto a holographic diffuser 3, which is an assembly of two diffusers (4, 6), turned about each other and joined by a layer of immersion transparent substance 5, and which forms a scattering indicatrix so as to provide a given viewing area with the required image contrast. Principal beams are directed near the optical axis of the system using a collective lens 7, placed in front of the holographic diffuser. The image is then directed to the viewing area of the driver 12 using a holographic beam splitter 9, placed on the windscreen 10.

EFFECT: increased reliability and provision for safe driving conditions.

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The invention relates to techniques for displaying information on the screen for collective use and can be used to provide control means of transport (vehicles, aircraft, vessels and other) day and night, namely, without being distracted from driving, the operator can see on the windshield of the vehicle image behind-cabin space, formed in conditions of poor visibility television cameras, the readings of the vehicle, the navigation and other reference sakorafas information.

There is a method of displaying information on the windshield of the vehicle, including the formation of flow of optical radiation, callmerobbie the first holographic element and the transfer of optical radiation in the spectral plane-selective reflection, after the selective reflection of the second holographic element flow of optical radiation from the plane moved to the optic zone of the operator [1].

The disadvantage of this technical solution are significant distortions in the visual zone of the operator, due to false images due to reflection of the flow of optical radiation from the front surface of the first and the front surface of the second holographic optical the elements. These false images are shifted relative to the actual image and also formed in the optic zone of the operator, making it difficult to control the vehicle.

The closest technical solution is the way the information is displayed on the windshield of the vehicle, including the formation of flow of optical radiation and transfer it to the intermediate plane, the adjustment of its wave front, the transfer of optical radiation in the spectral plane-selective reflection, after the selective reflection of the flow of optical radiation from the plane moved to the optic zone of the operator [2].

The disadvantage of this technical solution is the distortion of the formed image caused by the reflection from the windshield with a complicated surface shape, and limited visual area of the operator.

Use as a wavelength-selective reflective element hologram element having optical power, provides simplicity and compactness of the optical scheme that allows the use of such information display system in the cabins of different vehicles. However, when using this technical solution to display information on the windshield with a complex shape surfaces do not Ave the conduct of aberration correction that the optical system data of the holographic element. In addition, this holographic element has optical power and, therefore, the driver of the vehicle when observed through this optical element will be to see a larger image of behind-cabin space, and it does not meet the security requirements of driving a vehicle.

With this construction of the optical system of the display size of the audience area is proportional to the overall dimensions of the display. Diagram of the device information is displayed on the windshield of the vehicle (excluding mirrors, islamiayah optical axis)used for calculation of the main parameters of the device represented in figure 1.

The evaluation shows, to ensure the size of the audience area AndSP=⌀150 mm angular field of view 2αPZ=16°, the distance from the last surface collimation of the lens to the spectator area of the optical system is LSP=1000 mm, Then the focal length collimating lens

F'NUMBER=850 and diameters collimating lens DNUMBER=430 mm, the size of the display screen DTPrequired to build the image in infinity with the given parameters, must be not less than 240 mm

These image distortions and limitations of the visual zone of the operator complicate the management of vehicles persons of the NGOs in terms of low level of natural night illumination, and lead to a dramatic speed limit of the vehicle.

In addition, when displaying the image in the visual area after reflection from the selectively reflective element located at an angle of 45° to the line of sight of the operator is a geometric distortion due to the geometry of the optical system. For example, a rectangular raster on the screen of the monitor will be trapezoidal in the plane of the Supervisory zone operator.

The decline in the quality of the image on the windshield and the limitation of the audience area leads to a decrease superior vehicle control, especially in the dark, and, as a consequence, there has been a sharp decrease in the range of detection and recognition of objects and reducing the maximum allowable speed of the vehicle.

The proposed invention aims at solving the technical challenges of high-quality information is displayed on the windshield of the vehicle, is formed on the screen microdisplay, and the possibility of observing the formed image in a wide range of moving head operator (the spectator area operator), which in turn leads to a comfortable observation image and, therefore, to ensure the safe management of TRANS who artimi means in the context of low levels of natural night illumination, under the influence of powerful optical organised (the lights of passing vehicles and others) and natural (direct solar radiation, solar flare and other) interference.

The technical result obtained by use of the invention is to improve the reliability and the provision of security control vehicles, namely, that produces high quality images and create the required dimensions of spectator zone operator based on sound physiological recommendations visual activity drivers in the management of vehicles using lights on the windshield. Also the technical result is a significant simplification of manufacturing a holographic diffuser and beam splitter on the windshield of the vehicle, the simplification of the alignment optical system, also by decreasing the demands on the rigidity of the holders of optical elements. In addition, in the spectator area operator there are no distortions in the form of colored stripes and field aberration, due to the complex shape of the surface of the windshield. This ensures a higher technological and operational parameters of the device that implements the claimed method.

Technical is the second result is achieved by when displaying information on the windshield of the vehicle are forming flow of optical radiation and transfer it to the intermediate plane, the transfer of optical radiation in the spectral plane-selective reflection, after the selective reflection of the flow of optical radiation transfer in the optic zone of the operator, as well as to improve image quality, reduce the transverse dimensions of the flow of optical radiation and increase spectator area before the formation of the flow of optical radiation exercise his conversion and advanced intermediate planes change direction of the flow of optical radiation and adjust its indicatrix.

The invention allows real-time display of high quality images on the windshield of the vehicle through the use of specially designed optical system, the optical system which included real optical surface of the windshield of complex shape, which allows to carry out aberration correction optical system device with real-reflecting surface of the windshield, and due to the additional inclusion in the device of the video processor to correct the geometric distortions due to geometrical person who values construct the optical circuit devices.

For forming the desired size of the audience area, the image formed on the screen microdisplay, is projected by the lens on the topographic diffuser, representing an Assembly of two certain (specified) way of deployed relative to each other anamorphic (one-dimensional) cone. Holographic diffuser localizes intermediate image, and generates the desired indicatrix of scattering to provide a given audience area of the image with the desired image quality (contrast and spatial resolution).

To reduce the transverse dimensions of the device before the diffuser comes with a specially designed collective lens for the direction of the principal rays closer to the optical axis of the device.

The proposed solution provides at small transverse dimensions of the device that implements the method, displaying in real-time, high-quality images on the windshield of the vehicle, and also allows you to create image data in the maximum allowable spectator area operator, allowing comfortable management of vehicles at night and during the day under natural and artificial optical interference.

The invention is illustrated in graphic materials, where:

- Phi is .1 shows the optical layout of the device (without refracting and reflecting mirrors), implements the method of the prototype;

- figure 2 shows the optical layout of the device that implements the proposed method;

- figure 3 shows the optical scheme of recording holograms of the diffuser;

- figure 4 shows the optical scheme of the recording topographic beam splitter.

The proposed method can be implemented in the device, the optical scheme shown in figure 2.

The device includes a monitor 1, reproduction lens 2, a holographic diffuser 3, anamorphic diffuser 4 and 5, the layer of immersion transparent substance 6, the collective lens 7, the rotary mirror 8, the holographic beam splitter 9, the windshield 10, the viewing area of the driver 11, the eyes of the driver 12, the video processor 13.

A device that implements the proposed method works as follows.

The image behind-cabin space is formed on the screen 1 and is projected reproduction lens 2 on the holographic diffuser 3, representing the Assembly of the two deployed in a certain way relative to each other anamorphic (one-dimensional) cone 4 and 5, connected by a layer of immersion transparent substance 6 and forming the desired scattering indicatrix. Before a holographic diffuser 3 is set to the collective lens 7 to the direction of the principal rays closer to the optical axis of the system. Turning parts, all specifications is Noah mirror 8 islamiat optical axis of the system for ease of layout. Further, the radiation reflected from the holographic beam splitter 9, applied to the windshield 10 is directed in the audience area of the driver 11, which is the eye of the driver 12. To correct the geometric distortions caused by the geometry of the optical system before the formation of the image on the screen of the monitor using the video processor 13 is a digital image preprocessing.

In the display device information on the windshield of the vehicle, the scheme of which is shown in figure 2, as microdisplay on the screen which is formed of the displayed image, use a digital Micromirror device with the number of elements 800×600 and the size of the micromirrors 15×15 µm, which corresponds to the dimensions of the screen 12×9 mm

In the proposed device matrix microthermal is displayed by using the lens on a holographic diffuser size 200×200 mm, representing an Assembly of two deployed in a certain way relative to each other anamorphic (one-dimensional) cone, forming the desired scattering indicatrix.

Receipt and registration field of coherent radiation in the manufacture of optical diffuser is carried out in the device, which in an arbitrary axial cross-section shown in figure 3. The diagram presents: the beam of coherent radiation 14, od is rodny diffuser 15, aperture 16, the photosensitive medium 17 is transparent in the case of manufacturing a transmissive diffuser substrate 18.

Homocentric beam of coherent radiation 14 irradiates permeable homogeneous scatterer 15, such as frosted glass. Each of the inhomogeneities of the lens 15, acting on the amplitude and phase of coherent radiation in their area, can be considered as a secondary source of radiation, coherent with other sources.

For the diffuser, in particular in the plane of the photosensitive medium 17, the result of the interaction beams emitted from these secondary sources, forms a complex interference field that has the appearance of speckle patterns.

The size ofandaperture 16 for the diffuser 15 determines the minimum size of irregular spots of speckles in the photosensitive medium 4, which in turn determine the maximum scattering angle topographic diffuser with his lighting work light. In particular, in the limiting case, when used in a scheme of registration of a slit diaphragm with a small opening (a→0) get one-dimensional, or more precisely, quasi-one-dimensional diffuser.

After making holograms 3, 4 (figure 2), they are combined with each other through a layer of immersion substance in a single unit so that the beam difragirovavshej to Golo the Ramm 3, falls on the hologram 4, at an angle, so that after reflection to get into the audience area.

Combined thus holograms 3 and 4 represent the hologram optical element 2 having the desired scattering indicatrix. As the immersion substance can be used, for example, an optical adhesive.

A holographic beam splitter 9 (figure 2) is, as a rule, a multilayer structure. When the arrangement of layers parallel to the substrate there is no noise surface diffraction grating. The layered structure of topographic beam splitter can be formed on a separate substrate that is installed on the windshield, or in multi-layer (laminated) structure of the windshield of the vehicle. For the formation of patterns used holographic technology. The optical scheme of the recording topographic beam splitter is shown in figure 4.

Before topographical diffuser installed a collective lens for the direction of the principal rays closer to the optical axis of the system. Swivel mirror islamiat optical axis of the system for ease of layout. Further, the radiation reflected from topographic beam splitter is directed in the audience area of the driver, the diameter of which is about 150 mm

Thus, the proposed device is in has a higher technological and operational parameters. Significantly simplifies the production of topographic diffuser and beam splitter on the windshield of the vehicle, the alignment optical system, and also reduces demands on the rigidity of the holders of optical elements. In addition, in the spectator area operator there are no distortions in the form of colored stripes and field aberration, due to the complex shape of the surface of the windshield.

Literature

1. U.S. patent No. 4613200, MKI6G02B 5/32, 1986; U.S. Patent No. 5237455 "Optical combiner with integral support arm", Robert A. Bordo, Edvin D. Lorenz, Charles M. Enderby; the Patent of Russian Federation №2057352, MKI6SW and 5/32; U.S. Patent No. 5278532 "Automotive instrumentvirtual image display", Ronald G. Hegg, Ronald T. Smith, Mao-Jin Chem, John J. Ferrer.

2. U.S. patent No. 7031067 "Head-Up Display", Dmitry Voloschenko, Zili Li, George T. Villiath (Fig.1).

1. The way the information is displayed on the windshield of the vehicle, including digital preprocessing of the image by using the video processor to correct the geometric distortions caused by the geometry of the optical system, the image formation behind-cabin space on the screen and projecting reproduction lens on a holographic diffuser, which is an Assembly of two cones that are deployed relative to each other and connected by a layer of immersion transparent substance, and which forms the indicatrix RA is sown or so, to ensure that a given audience area required image contrast, and the main direct rays closer to the optical axis of the system through the collective lens placed in front of a holographic diffuser, then send the image in the viewing area of the driver using a holographic beam splitter deposited on the windshield.

2. The method according to claim 1, in which the monitor uses a digital Micromirror device.



 

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