HUD device for eliminating dizziness of polarized sunglasses

Abstract

The utility model relates to a divisional application, the original application number is 202420854345.2, the application date is April 23, 2024, and the name is a reflecting mirror for reducing damage to a backlight path of an HUD (Head Up Display) device. The utility model provides an HUD (Head Up Display) device for eliminating dizziness of polarized sunglasses, which belongs to the technical field of HUD devices and specifically comprises a shell provided with an accommodating space and a light emitting surface; the projection display system is arranged in the accommodating space and is used for generating an image source; the imaging system is arranged in the accommodating space and projects the image source; the dustproof cover plate is arranged on the light emitting surface; the dustproof cover plate comprises an annular rubber frame, a grating control film and a high-transmittance control film, wherein the grating control film and the high-transmittance control film are sequentially arranged in a stacked mode. The high-transmittance control film has a light deflection function, and S polarized light is rotated into approximate P polarized light, so that the problem of dizziness or no image of polarized sunglasses is solved.

Description

[0001] This utility model is a divisional application, the original application number is 202420854345.2, the application date is April 23, 2024, and the name is a reflector for reducing backlight damage of HUD device. Technical Field

[0002] The utility model relates to the technical field of HUD devices and streaming media screen display, in particular to a reflector of the HUD device and the structure of a streaming media screen. Background Art

[0003] Head-up display (HUD) is an auxiliary driving device used to project the vehicle's navigation information and vehicle operating status information onto the windshield. The head-up display device includes an image unit (image source) for emitting projection light, a primary reflector, a secondary reflector, etc. During normal use, the following situations may occur:

[0004] When the angle of light projected by the HUD onto the windshield is exactly the same as the angle at which sunlight hits the windshield, the sunlight enters the HUD in the opposite direction along the HUD light path and converges or forms a light spot near the image part (or display screen). The irradiance of the light spot is several or dozens of times that of the incident sunlight. Most of the energy of the light spot will be absorbed by the image part (display screen), causing local overheating or even burning the image part (display screen) ( Figure 1 ).

[0005] A polarizing plate or phase difference film is placed on the HUD display screen, reflector or windshield to change the vibration direction of the projected light to a specific direction, forming a virtual image composed of S-polarized light on the windshield or streaming media screen. The observer cannot see the virtual image through polarized sunglasses, or the entire screen appears bright, causing dizziness ( Figure 1 ). Utility Model Content

[0006] The main purpose of the utility model is to solve the above-mentioned technical problem that an observer cannot see the virtual image displayed by the HUD device through polarized sunglasses or the whole screen is brightly lit, causing dizziness.

[0007] According to the utility model, a HUD device for eliminating dizziness caused by polarized sunglasses is proposed, which includes:

[0008] A housing having a containing space and a light emitting surface;

[0009] A projection display system is disposed in the accommodation space and generates an image source;

[0010] An imaging system, disposed in the accommodation space, projects the image source;

[0011] A dust cover plate, arranged on the light emitting surface;

[0012] The dustproof cover plate comprises an annular rubber frame, and a grating control film and a high-transmittance control film which are stacked in sequence.

[0013] Preferably, the dust cover plate has a certain curvature.

[0014] Preferably, a hardening coating is disposed on the outer side of the high-transmittance control film.

[0015] Preferably, the grating control film has the function of transmitting visible light and cutting off infrared light.

[0016] Preferably, the high-transmittance control film has a light deflection function.

[0017] Preferably, the imaging system includes a primary reflector and a secondary reflector, the primary reflector includes an optical convex mirror and a semi-transparent and semi-reflective control film bonded by optical glue; the secondary reflector includes an optical concave mirror and a fully reflective control film bonded by optical glue; the optical convex mirror and the optical concave mirror are free-form glass.

[0018] Preferably, the working surface of the primary reflector is convex; and the working surface of the secondary reflector is concave.

[0019] The technical solution of the utility model adopts a HUD device with a dust cover with a certain curvature. The dust cover has an annular rubber frame, and a grating control film, a high-transmittance control film and a hardened coating layer stacked in sequence. The grating control film has the function of transmitting visible light and cutting off infrared light, thereby preventing infrared light in sunlight from entering the interior of the HUD device and causing a local temperature rise inside; the high-transmittance control film has a light deflection function, rotating S polarized light into approximately P polarized light to solve the dizziness or image loss caused by polarized sunglasses. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] With reference to the accompanying drawings, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings are only used for illustrative purposes and are not intended to limit the protection scope of the present utility model.

[0021] Figure 1 is a schematic diagram exemplarily showing a HUD device and an optical path in the device;

[0022] Figure 2 It is a three-dimensional structural diagram of a primary reflector involved in an embodiment of the utility model;

[0023] Figure 3 It is a three-dimensional structural diagram of a secondary reflector involved in an embodiment of the utility model;

[0024] Figure 4This is a three-dimensional structural diagram of a dust cover plate of a HUD device according to an embodiment of the utility model;

[0025] Figure 5 It is a three-dimensional structural diagram of a streaming media screen involved in an embodiment of the utility model.

[0026] Description of Figure Numbers:

[0027] 1. HUD device;

[0028] 11. Image source; 101. Projection light; 102. Reflection light path; 103. Sunlight; 111. Virtual image;

[0029] 12. Primary reflector; 13. Secondary reflector; 14. Windshield; 15. Viewpoint; 16. Polarized sunglasses;

[0030] 212. Optical convex mirror; 213. Optical adhesive; 214. Semi-transparent and semi-reflective control film;

[0031] 313. Optical concave mirror; 314. Total reflection control film;

[0032] 411, rubber frame; 412, grating control film; 413, high-transmittance control film; 414, hardened coating;

[0033] 511, streaming media screen; 512, frame glue foam; 512a, infrared sensor probe; 513, high-transmittance control film; 514, hardening coating; 515, outer protective film.

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] Figure 1A schematic diagram exemplarily shows a HUD device and an optical path in the device. The directions of the X-axis, Y-axis and Z-axis in the present application are explained.

[0038] exist Figure 1 1 shows a windshield 14 as a moving body, the Y axis represents the horizontal direction, the Z axis represents the vertical direction, and the X axis is a direction perpendicular to the paper surface.

[0039] The X axis is a direction that is horizontal to the ground and is orthogonal to the traveling direction (Y axis) of the windshield 14 as a moving body when the windshield 14 moves forward.

[0040] The Y axis is horizontal to the ground and is the moving direction when the windshield 14 as a moving body moves forward.

[0041] The Z axis is perpendicular to the ground.

[0042] The moving bodies mentioned above include vehicles (passenger cars, trucks, buses, trams), trains, ships, airplanes, etc.

[0043] It can be seen that the windshield is tilted with respect to the XZ plane. Figure 1 The windshield in the figure is a laminated glass, and a phase difference film (not shown in the figure) is arranged between the laminated glasses. The optical axis (the axis in the direction of the maximum refractive index) of the phase difference film is inclined at a certain angle to the X-axis, so that the vibration direction of the incident projection light is rotated. The rotated projection light may become S-polarized light or P-polarized light.

[0044] Continue to see Figure 1 The plane of the three points, namely, the light emitting point of the image source 11, the reflection point of the projection light 101 on the surface or inside of the windshield 14, and the viewer's viewpoint 15, is the incident plane.

[0045] When a polarizing plate is arranged in the incident light path between the image source 11 and the windshield 14, the vibration direction of the projection light 101 becomes a specific direction. For example, when the vibration direction of the projection light 101 passing through the polarizing plate is P polarized light parallel to the incident plane, when the phase difference film in the laminated glass is 1 / 2 wavelength (half wavelength film) or 1 / 4 wavelength film, the viewer's viewpoint 15 sees a virtual image 111 reflected on the surface or inside of the windshield 14. The virtual image 111 is composed of P polarized light, and the viewer can also see the virtual image 111 through the polarized sunglasses 16.

[0046] Glass materials used for laminated glass include soda-lime silicate glass, aluminosilicate glass, and borosilicate glass. Laminated glass can also be replaced by single-layer glass.

[0047] The windshield is usually an irregular curved surface, and a phase difference film is formed on the surface of the glass. The forming methods or ways include coating, lamination, attachment, adhesion, crimping, transfer, etc.

[0048] The HUD device 1 includes a projection display system and an imaging system, wherein the projection display system includes a liquid crystal display LCD, a liquid crystal on silicon LCoS and a digital light path processor DLP.

[0049] The HUD device converts information into image information through an image generation unit and forms an image source through a display unit. The image source is projected onto the windshield through an optical system, solving the problem of inconsistency between information interaction and driving safety during driving.

[0050] For details, see Figure 1 The image source 11 generated by the projection unit is reflected twice by the primary reflector 12 and the secondary reflector 13 and then projected onto the windshield 14 . The projection light 101 emitted by the image source 11 is reflected on the surface or inside of the windshield 14 and enters the viewer's viewpoint 15 along the reflected light path 102 . The viewer sees a virtual image 111 on the windshield 14 .

[0051] Continue to see Figure 1 When the angle at which the sunlight 103 irradiates the windshield 14 is exactly the same as the angle of light projected onto the windshield 14 by the HUD device 1, the sunlight 103 enters the interior of the HUD device 1 in the reverse direction along the incident light path of the HUD device 1, and converges or forms a light spot near the image source 11, causing a local temperature increase.

[0052] This application proposes a structure of a primary reflector, see Figure 2 The primary reflector 12 includes an optical convex mirror 212 and a semi-transparent and semi-reflective control film 214 bonded by optical glue 213.

[0053] The optical convex mirror 212 is a free-form glass. For the material of the free-form glass, please refer to the relevant introduction of the laminated glass material mentioned above.

[0054] According to aberration theory, the lens material and optical refraction are certain, and the geometric shape of the reflective surface has the greatest impact on the aberration. The imaging quality of the imaging system is closely related to the size of the aberration. In engineering practice, the aberration cannot be eliminated. Only by reasonably correcting and balancing the aberration, for the off-axis imaging system, when the aberration of the on-axis point and the off-axis aberration of each field of view are kept consistent as much as possible, a uniformly distributed image quality can be obtained in the off-axis state. Therefore, when the primary reflector 12 is convex, the secondary reflector 13 is concave.

[0055] The optical adhesive 212 plays a bonding role and has a transmittance-enhancing effect on light, thereby preventing light from being lost when transmitted in the air.

[0056] The semi-transparent and semi-reflective control film 214 has the function of transmitting infrared light (770-1150nm) and reflecting visible light (420-680nm). For example, the semi-transparent and semi-reflective control film produced by 3M has a reflectivity of ≥90% for visible light and ≤3% for infrared light.

[0057] This application proposes a secondary reflector structure, see Figure 3 The secondary reflector 13 includes an optical concave mirror 313 and a total reflection control film 314 bonded by an optical adhesive 213 .

[0058] The optical concave mirror 313 is a free-form glass. For the material of the free-form glass, please refer to the relevant introduction of the laminated glass material mentioned above.

[0059] The optical convex mirror 212 and the optical concave mirror 313 with free surfaces are tilted, and the viewer's viewpoint 15 is not on the optical axis of the reflection light path 102. The surrounding stray light will not be reflected into the viewer's field of view, avoiding the interference of stray light. When observing the virtual image 111, the image distortion becomes smaller, and a wider field of view can be obtained.

[0060] The total reflection control film 314 reflects most of the visible light, which can improve the brightness.

[0061] In the above embodiment, the image source 11 is reflected by the primary reflector 12 and the secondary reflector 13, which prolongs the viewing distance of the viewer, and makes the distance between the viewpoint 15 and the virtual image 11 longer, so as to obtain a better visual effect. It can be known that multiple groups of primary reflectors 12 and secondary reflectors 13 can be provided to obtain a longer viewing distance.

[0062] The sunlight 103 enters the interior of the HUD device 1 in the reverse direction along the incident light path of the HUD device 1, and is reflected by the secondary reflector 13 to enter the primary reflector 12. The primary reflector 12 has a semi-transparent and semi-reflective control film 214 with a convex structure, and can disperse, transmit and absorb most of the infrared rays. The primary reflector does not form a focusing function, thereby preventing the sunlight 103 from converging near the image source 11 or forming a light spot, causing a local temperature increase.

[0063] This application proposes a structure of a head-up display dust cover, see Figure 4 The dust cover has a certain curvature and includes an annular rubber frame 411, and a grating control film 412, a high-transmittance control film 413 and a hardening coating 414 stacked in sequence.

[0064] The rubber frame 411 has a sealing function to protect the HUD device 1 from moisture and water. The rubber frame can also be replaced with foam cotton.

[0065] The grating control film 412 has the function of transmitting visible light (420-680nm) and blocking infrared light (750-1150nm). For example, the grating control film produced by JSR Corporation and 3M Company has a visible light transmittance of ≥93%, an infrared transmittance of ≤3%, and a brightness increase of 30%.

[0066] The high-transmittance control film 413 has a light deflection function, such as a high-transmittance polycarbonate light control film, which can rotate the vibration direction of light by a certain angle. In the absence of a polarization device that can obtain P-polarized light, the high-transmittance control film 413 can rotate S-polarized light, thereby avoiding the dizziness or no image that occurs in the case of polarized sunglasses 16.

[0067] The hardened coating 414 prevents scratches on the surface of the HUD device 1 and also has the function of blocking dust.

[0068] The HUD device 1 has a shell and wraps up the projection display system and the imaging system. Taking the TFT liquid crystal display as an example, a multi-stage reflector and a TFT liquid crystal display are arranged in the shell in an optical imaging manner. The above-mentioned dust cover is arranged on the light-emitting surface of the shell of the HUD device 1. The grating control film 412 blocks most of the infrared rays from entering the HUD device 1 and allows most of the visible light to pass through. At the same time, the high-transmittance control film 413 has a light deflection function, which rotates the S-polarized light into approximately P-polarized light to solve the dizziness or no image situation caused by the polarized sunglasses 16.

[0069] This application proposes a structure of an anti-dizziness streaming media screen, see Figure 5 A rubber frame 512 is provided on the back of the streaming media screen 511 for fixing, vibration isolation and sealing; an infrared sensing probe 512a is provided on the top of the rubber frame 512 for sensing and starting the streaming media screen 511; a high-transmittance control film 513 and a hardened coating 514 are stacked in sequence in front of the streaming media screen 511.

[0070] The functions of the high transmittance control film 513 and the hardened coating layer 514 are the same as those of the high transmittance control film 413 and the hardened coating layer 414 in the above embodiment.

[0071] An outer protective film 515 is provided on the outer side of the hardened coating 514, which can be torn off after installation or retained.

[0072] Exemplarily, in the virtual image or streaming media screen of the HUD device 1, the related information displayed is displayed in a fixed format content, or is displayed in a specified area. In order to improve heat load management and adjust the vibration direction of light, the above-mentioned semi-transparent and semi-reflective control film, fully reflective control film, grating control film and high-transmittance control film can be set locally (fixed format content display area) or can be set at smaller unit structural intervals to achieve a larger contrast between the displayed information and the background, so as to facilitate viewers to obtain clear images and at the same time protect the projection display system of the HUD device 1.

Claims

1. A HUD device for eliminating dizziness caused by polarized sunglasses, characterized in that: Include: A housing having a containing space and a light emitting surface; A projection display system is disposed in the accommodation space and generates an image source; An imaging system, disposed in the accommodation space, projects the image source; A dust cover plate, arranged on the light emitting surface; The dustproof cover plate comprises an annular rubber frame (411), and a grating control film (412) and a high-transmittance control film (413) which are stacked in sequence.

2. The HUD device according to claim 1, characterized in that: The dustproof cover plate has a certain curvature.

3. The HUD device according to claim 2, characterized in that: A layer of hardening coating (414) is disposed on the outer side of the high-transmittance control film (413).

4. The HUD device according to claim 3, characterized in that: The grating control film (412) has the function of transmitting visible light and cutting off infrared light.

5. The HUD device according to claim 4, characterized in that: The high-transmittance control film (413) has a light deflection function.

6. The HUD device according to claim 5, characterized in that: The imaging system comprises a primary reflector (12) and a secondary reflector (13), The primary reflector (12) comprises an optical convex mirror (212) and a semi-transparent and semi-reflective control film (214) bonded by optical glue; The secondary reflector (13) comprises an optical concave mirror (313) and a total reflection control film (314) bonded by optical glue; The optical convex mirror (212) and the optical concave mirror (313) are free-form glass.

7. The HUD device according to claim 6, characterized in that: The working surface of the primary reflector (12) is a convex surface; and the working surface of the secondary reflector (13) is a concave surface.

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