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KR-20260068105-A - Windscreen for a display system having a p-polarization imaging unit

KR20260068105AKR 20260068105 AKR20260068105 AKR 20260068105AKR-20260068105-A

Abstract

The present invention relates to a windscreen (10) having an upper edge (O) and a lower edge (U), comprising an outer pane (1) having an outer surface (I) and an inner surface (II) and an inner pane (2) having an outer surface (III) and an inner surface (IV), wherein the inner surface (II) of the outer pane (1) and the outer surface (III) of the inner pane (2) are connected to each other through a thermoplastic intermediate layer (3) suitable for reflecting p-polarized radiation, and, starting from the inner surface (IV) of the inner pane (2), a reflective coating (20) is provided on the inner surface (IV) of the inner pane (2), comprising: - an optically high-refractive index layer (21) having a refractive index of 1.9 or higher, - a reflection-enhancing layer (22) based on a metal, semiconductor, electrically conductive carbide or electrically conductive nitride in at least a portion, and - an optically low-refractive index layer (23) having a refractive index of 1.6 or lower, in a specified order. The windscreen (10) has at least a first sub-region (F) and a second sub-region (G), the first sub-region (F) is at a smaller distance from the lower edge (U) than the second sub-region (G), and the layer thickness of the reflection-increasing layer (22) of the first sub-region (F) is greater than the layer thickness of the reflection-increasing layer (22) of the second sub-region (G).

Inventors

  • 라스테가르 하디
  • 모테마니 샤라비아니 야히아
  • 하겐 얀

Assignees

  • 쌩-고뱅 세쿠리트 프랑스

Dates

Publication Date
20260513
Application Date
20240918
Priority Date
20231012

Claims (15)

  1. A windscreen (10) having an upper edge (O) and a lower edge (U), comprising an outer pane (1) having an outer surface (I) and an inner surface (II) and an inner pane (2) having an outer surface (III) and an inner surface (IV), wherein the inner surface (II) of the outer pane (1) and the outer surface (III) of the inner pane (2) are connected to each other through a thermoplastic intermediate layer (3). Suitable for reflecting p-polarized radiation, starting from the inner side surface (IV) of the inner pane (2) in the specified order: - Optical high-refractive index layer (21) having a refractive index of 1.9 or higher, - A reflection-enhancing layer (22) based at least partially on a metal, semiconductor, electrically conductive carbide or electrically conductive nitride, - A reflective coating (20) comprising an optically low-refractive index layer (23) having a refractive index of 1.6 or less is arranged on the inner side surface (IV) of the inner paint (2), and A windscreen (10) has at least a first sub-region (F) and a second sub-region (G), the first sub-region (F) has a smaller distance from the lower edge (U) than the second sub-region (G), and the layer thickness of the reflection-enhancing layer (22) of the first sub-region (F) is greater than the layer thickness of the reflection-enhancing layer (22) of the second sub-region (G).
  2. In claim 1, the reflection enhancing layer (22) is based on platinum, ruthenium, rhodium, palladium, osmium, iridium, titanium, zirconium, hafnium, niobium, tantalum, nickel, chromium, aluminum, silicon, germanium, α-tin, titanium nitride, titanium carbide, tungsten carbide, tungsten nitride, zirconium carbide, zirconium nitride, hafnium carbide, hafnium nitride, niobium carbide, niobium nitride, tantalum carbide, tantalum nitride, or a compound of said materials, windscreen (10).
  3. A windscreen (10) according to claim 1 or 2, further having a third sub-region (H) having a greater distance from the lower edge (U) than the second sub-region (G), wherein the layer thickness of the reflection-enhancing layer (22) of the third sub-region (H) is smaller than the layer thickness of the reflection-enhancing layer (22) of the second sub-region (G), or wherein the reflection-enhancing layer (22) does not exist in the third sub-region (H).
  4. A windscreen (10), wherein, in any one of claims 1 to 3, the reflection-enhancing layer (22) of the first sub-region (F) has a layer thickness of 10 nm to 100 nm, preferably 10 nm to 20 nm, and/or the reflection-enhancing layer (22) of the second sub-region (G) has a layer thickness of 1 nm to 10 nm, preferably 3 nm to 7 nm.
  5. In any one of claims 1 to 4, the optical high-refractive index layer (21) is based on silicon nitride, mixed silicon-metal nitride, preferably silicon zirconium nitride, silicon titanium nitride or silicon hafnium nitride, or aluminum nitride, windscreen (10).
  6. In any one of claims 1 to 5, the optical high-refractive index layer (21) has a thickness of 40 nm to 100 nm, preferably 50 nm to 90 nm, a windscreen (10).
  7. A windscreen (10), wherein, in any one of claims 1 to 6, the reflective coating (20) comprises a dielectric optical high-refractive index secondary layer (24) below the optical high-refractive index layer (21) or between the optical high-refractive index layer (21) and the reflection enhancement layer (22), the optical high-refractive index layer (21) has a refractive index greater than 2.1, and the optical high-refractive index secondary layer (24) has a refractive index of 1.9 to 2.1.
  8. In any one of claims 1 to 7, the optical low-refractive index layer (23) is based on silicon oxide, magnesium fluoride or calcium fluoride, preferably based on silicon oxide, windscreen (10).
  9. In any one of claims 1 to 8, the optical low-refractive index layer (23) has a thickness of 50 nm to 200 nm, preferably 90 nm to 160 nm, a windscreen (10).
  10. In any one of claims 1 to 9, having a transparent viewing area (D) and an opaque masking area (M), - The first sub-region (F) is arranged at least partially in the masking region (M), and - A second sub-area (G) is a windscreen (10) that is at least partially arranged within a viewing area (D).
  11. It is a display system, and - A windscreen (10) according to any one of claims 1 to 10 having at least one display area (A, B), and - A display system comprising at least one imaging unit (4) that is oriented toward a display area (A, B) and irradiates the display area with p-polarized radiation.
  12. In paragraph 11, the windscreen (10) has a first display area (A) and a second display area (B), A display system in which a first imaging unit (4.1) is oriented toward a first display area (A) and irradiates the first display area with p-polarized radiation, and a second imaging unit (4.2) is oriented toward a second display area (B) and irradiates the second display area with p-polarized radiation.
  13. A method for manufacturing a windscreen (10) according to any one of claims 1 to 10, wherein an outer paint (1) and an inner paint (2) are provided and connected to each other through a thermoplastic intermediate layer (3), and a reflective coating (20) is applied to the inner surface (IV) of the inner paint (2) by chemical vapor deposition, preferably by magnetic field assisted cathodic sputtering.
  14. A method in which, in paragraph 13, a higher material flow is achieved in the first sub-region (F) than in the second sub-region (G) during application by using a mask or changing the width of the gap when applying the reflection-enhancing layer (22).
  15. A method according to claim 13 or 14, wherein the inner paint (2) is positioned on a conveyor belt to apply a reflective coating (20), and the speed of the conveyor belt is adjusted so that the speed of the conveyor belt is lower when the reflective enhancement layer (22) is deposited in the first sub-region (F) than when the reflective enhancement layer (22) is deposited in the second sub-region (G).

Description

Windscreen for a display system having a p-polarization imaging unit The present invention relates to a windscreen, a method for manufacturing a windscreen, and a vehicle display system having a windscreen. Automotive windscreens, particularly for passenger cars, are designed as laminated panes (laminated safety glass) consisting of an outer pane and an inner pane that are laminated together through a thermoplastic interlayer. These are typically designed as circumferential edge regions and have an opaque masking region surrounding a central see-through region. The opaque masking region primarily serves to protect the adhesive used to bond the windscreen to the vehicle body from UV radiation. The masking region is typically formed by a black cover print on the surface of the outer pane facing the interlayer. Modern vehicles are increasingly equipped with so-called head-up displays (HUDs). Typically, a projector within the instrument cluster projects an image onto the windshield's viewing area, where it is reflected and perceived by the driver as a virtual image behind the windshield (as seen by the driver). Consequently, important information—such as current driving speed, navigation messages, or warnings—can be projected into the driver's field of vision without the need for the driver to take their eyes off the road. As a result, head-up displays can make a substantial contribution to increasing traffic safety. HUD projectors typically project onto the windscreen at an angle of incidence of approximately 65°, which is close to the Brewster angle for the air-glass transition (57.2° for soda-lime glass). This situation can be utilized for a transparent representation of the HUD projection: when the HUD projector operates with p-polarized radiation, it reflects almost no radiation from the outer glass surface of the windscreen. Instead, the windscreen is equipped with a reflective coating suitable for reflecting p-polarized radiation to create a display image. Because there is only one significant reflective plane, namely the reflective coating, a transparent display image is created without any ghosting (or with a weakly represented ghosting image due to residual reflection from the outer glass surface when the angle of incidence deviates slightly from the Brewster angle). For example, see DE102014220189A1, EP3187917B1 and WO2021104800A1. It has also been proposed to use an opaque masking region as a display surface for a display system. To this end, the display area of the masking region is illuminated by an imaging unit such as a screen. Within the scope of the present invention, this is also referred to as a black print display (BPD). For example, refer to DE102009020824A1, WO2022073894A1, and WO2022073860A1. In this manner, a display for the driver, previously located within the area of the instrument panel, can be displayed on the windscreen itself. Examples of such displays include driving speed, time, engine speed, a display of a navigation system, information on speed limits (traffic sign recognition), images from a rear camera, and various status indicators regarding the status of the vehicle. Such a display system within the masking region is also preferably operated with p-polarized radiation to avoid reflections on the glass surface and the resulting ghost images. The reflective coating for the display area in the viewing area must have a high degree of transparency to avoid critically restricting the view through the windscreen. This situation typically limits the reflectivity for p-polarized radiation. Since the masking area is opaque anyway, this limitation does not apply to the display area within the masking area. A reflective coating with higher reflectivity can be used here to produce a more intense display image. For this reason, different reflective coatings are typically used for displays within the viewing area (Head-Up Displays, HUDs) and displays within the masking area. CN113031276A discloses a display system, wherein the inner surface of the inner pane comprises a reflective coating comprising at least one sequence of a dielectric optical high refractive index (refractive index ≥ 1.8) layer and a dielectric optical low refractive index (refractive index ≤ 1.6) layer. Unpublished European application EP23155854.5 discloses a display system, wherein the inner pane comprises a reflective coating comprising an optically high refractive index (refractive index > 1.9) layer, a reflection-enhancing layer based on metal or semiconductor, and an optically low refractive index (refractive index ≤ 1.6) layer. The present invention is described in more detail below with the help of the drawings and exemplary embodiments. The drawings are schematic representations and are not drawn to actual scale. The drawings do not limit the invention in any way. In the drawing: FIG. 1 shows a plan view of an embodiment of a windscreen according to the present invention. Figure 2 shows a cross-sectional vie