Light blocking film for HUD and HUD system for vehicles

Abstract

To provide a light blocking film for an HUD and an HUD system for vehicles.SOLUTION: A light blocking film for an HUD comprises: a plurality of light blocking materials configured to transmit first directional light propagating from a view in front of a vehicle in a first direction and block at least a portion of second directional light propagating from an external light source in a second direction that is opposite a third direction in which light is output from a display panel for an HUD provided in the vehicle; and a transparent material that fills a space between the plurality of light blocking materials. At least one gradient of the plurality of light blocking materials corresponds to the first direction.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The following embodiments relate to a light blocking film for a HUD and a vehicle HUD system. [Background technology]

[0002] A head up display (HUD) system can provide various information to the driver by generating a virtual image in front of the driver and displaying information within the virtual image. The information provided to the driver may include dashboard information such as the vehicle speed, the amount of gasoline remaining, engine RPM (revolutions per minute), and navigation information. The driver can easily grasp the information displayed in front of him / her without moving his / her eyes while driving, which increases the stability of driving. In addition to dashboard information and navigation information, the HUD system can provide the driver with lane markings, construction markings, traffic accident markings, warning marks showing people walking on the road, and other information based on an augmented reality (AR) method to assist in cases where forward visibility is poor.

[0003] When visual information is realized in 3D by the HUD system, the larger the viewing angle (FOV, Field of View) for the visual information displayed by the HUD system and the longer the imaging distance (VID, Virtual Image Distance) for the visual information displayed by the HUD system, the more efficiently the visual information displayed by the HUD system can be transmitted to the driver. However, the larger the viewing angle, the greater the amount of sunlight received by the HUD system, and the longer the imaging distance, the higher the density at which sunlight is concentrated by the HUD system. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a light blocking film for HUD and a HUD system for a vehicle. [Means for solving the problem]

[0005] In one embodiment, the light blocking film for HUD includes a plurality of light shielding materials that transmit light in a first direction propagating from a forward field of view of a vehicle while blocking at least a portion of light in a second direction propagating from an external light source in a second direction opposite to a third direction output from a display panel for a HUD installed in the vehicle, and a transparent material filling spaces between the plurality of light blocking materials, the plurality of light blocking materials having at least one inclination corresponding to the first direction.

[0006] At least some of the light blocking materials may have the same inclination as each other.

[0007] The inclination of the light blocking material may be between 40 degrees and 85 degrees.

[0008] The spacing between the light blocking materials may be between 0.3 mm and 0.5 mm.

[0009] The light-shielding film may have a thickness of 0.35 mm to 0.40 mm.

[0010] The display panel may further include a light-reflecting material provided on the plurality of light-blocking materials and the transparent material to reflect light output from the display panel.

[0011] The light blocking film for HUD according to an embodiment may further include a light transmitting material provided on the plurality of light blocking materials and the transparent material to protect the vehicle from an external environment.

[0012] The plurality of light blocking materials can absorb a portion of the light that reaches the plurality of light blocking materials.

[0013] The plurality of light blocking materials can polarize light.

[0014] In one embodiment, a vehicle HUD system includes a display panel that outputs light containing visual information, a magnifying optical system for magnifying and displaying the visual information, and a light blocking film including a plurality of light blocking materials that transmit light in a first direction propagating in a first direction from a forward field of view of the vehicle while blocking at least a portion of light in a second direction propagating from an external light source in a second direction that is opposite to a third direction in which the light containing the visual information, which is the output of the display panel, is output, and the plurality of light blocking materials have at least one tilt corresponding to the first direction.

[0015] At least some of the light blocking materials may have the same inclination as each other.

[0016] At least some of the light blocking materials may be arranged to have different inclinations from one another.

[0017] At least a portion of the light containing the visual information output from the display panel may be reflected by a transparent layer adjacent to the light blocking film.

[0018] The inclination of the light blocking material may be between 40 degrees and 85 degrees.

[0019] The spacing between the light blocking materials may be between 0.3 mm and 0.5 mm.

[0020] The thickness of the light blocking film may be between 0.35 mm and 0.40 mm.

[0021] The light-blocking film may further include a light-reflecting material provided on a first surface of the light-blocking film to reflect light output from the display panel.

[0022] The light-blocking film may further include a light-transmitting material provided on a second surface of the light-blocking film to protect the vehicle from an external environment.

[0023] The plurality of light blocking materials can polarize light.

[0024] The plurality of light blocking materials may have a property of polarizing light, and a material having a property of polarizing light may be further provided on a path of light output from the display panel.

[0025] The plurality of light blocking materials are capable of polarizing s-polarized light while passing p-polarized light, and the material with the properties described above is capable of polarizing p-polarized light while passing s-polarized light.

[0026] The plurality of light blocking materials polarize p-polarized light while passing s-polarized light, and the polarizing material polarizes s-polarized light while passing p-polarized light.

[0027] The plurality of light blocking materials can absorb a portion of the light that reaches the plurality of light blocking materials.

[0028] The light blocking film may be located between the vehicle's windshield and an interior glass layer, on the exterior of the vehicle's windshield, or on the interior of the interior glass layer.

[0029] The light blocking film may be positioned on a front windshield of the vehicle to correspond to a portion where light output from the display panel is incident.

[0030] The external light source may correspond to the sun.

[0031] The inclinations of the plurality of light blocking materials may correspond to a plurality of viewing directions of a driver of the vehicle.

[0032] The inclination of the plurality of light blocking elements may correspond to the position of the plurality of light blocking elements. Effect of the Invention

[0033] According to the present invention, a light blocking film for HUD and a vehicle HUD system can be provided. [Brief description of the drawings]

[0034] [Figure 1] 1 is a diagram illustrating the progression of light in a vehicle HUD system that does not use a light blocking film according to an embodiment. [Diagram 2] 10A and 10B are diagrams illustrating an effect of using a light blocking film for a HUD in a vehicle HUD system according to an embodiment. [Diagram 3] 1 is a diagram illustrating a configuration of a light blocking film for a HUD according to an embodiment. [Figure 4] 1 is a diagram illustrating a design of a light blocking film for a HUD according to an embodiment. [Diagram 5] 1 is a view illustrating a case where a light blocking film for a HUD according to an embodiment is positioned inside a front windshield of a vehicle. [Figure 6] 1 is a view illustrating a case where a light blocking film for a HUD according to an embodiment is positioned between double glass panes of a front glass window of a vehicle. [Figure 7A] 1 is a diagram illustrating the propagation of light when multiple light blocking materials according to an embodiment have the property of polarizing light. [Figure 7B] 1 is a diagram illustrating a HUD system in which multiple light blocking materials have light polarizing properties in accordance with one embodiment. [Figure 8] 1 is a diagram for explaining the line of sight of a passenger in a vehicle according to an embodiment; [Figure 9] 1 is a view illustrating a shape in which a light blocking film for a HUD according to an embodiment is arranged on a front glass window of a vehicle. [Figure 10] 1 is a view illustrating a shape of a light blocking film for a HUD according to an embodiment, which is positioned to correspond to a portion of a front glass window of a vehicle where light output from a display panel is incident. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] The specific structural or functional descriptions disclosed herein are merely exemplary for the purpose of describing the embodiments, and the embodiments can be implemented in various different forms. Therefore, the embodiments are not limited to the specific disclosed forms, and the scope of the present specification includes modifications, equivalents, or alternatives that fall within the technical spirit.

[0036] Although terms such as first or second may be used to describe multiple components, such terms should be construed only for the purpose of distinguishing one component from the other components. For example, a first component may be termed a second component, and similarly, a second component may be termed a first component.

[0037] When any component is referred to as being "connected" to another component, it is directly connected or connected to the other component, but it should be understood that there may be other components in between.

[0038] The singular expression includes the plural expression unless the context clearly indicates otherwise. In this specification, the terms "comprise" or "have" and the like indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, and should be understood as not precluding the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0039] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person having ordinary skill in the art to which the present invention belongs. Commonly used predefined terms should be interpreted as having a meaning consistent with the meaning in the context of the related art, and should not be interpreted as ideal or overly formal unless expressly defined in the present specification. Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. In the description with reference to the accompanying drawings, the same components are given the same reference numerals regardless of the drawing numerals, and redundant description thereof will be omitted.

[0040] FIG. 1 is a diagram for explaining the progression of light in a vehicle HUD system that does not use a light blocking film according to an embodiment.

[0041] 1, a vehicle HUD system without using a light blocking film according to an embodiment includes a display panel 140 and a magnifying optical system. The display panel 140 is a device that outputs light containing visual information, and the visual information may include, in addition to dashboard information and navigation information, lane markings to assist in cases where forward visibility is poor, construction markings, traffic accident markings, warning marks showing pedestrians, and the like.

[0042] The third directional light 130 corresponds to light including visual information output from the display panel 140. The visual information included in the third directional light 130 may be provided to the driver in an Augmented Reality (AR) manner. According to an embodiment, the visual information included in the third directional light 130 is information displayed in three dimensions.

[0043] The magnification optical system determines a field of view (FOV) and a virtual image distance (VID) for visual information contained in light output from the display panel 140. The field of view is a value that determines how large the visual information appears to a viewer, such as a driver, and the virtual image distance is a value that determines how far away the visual information appears to be to the driver.

[0044] The magnification optics may include mirrors and / or lenses. For example, the magnification optics may include two concave mirrors, two convex lenses, or one concave mirror and one convex lens.

[0045] The magnifying optical system is determined to have a viewing angle of view large enough to ensure the visibility of visual information to a viewer such as a driver. Also, the magnifying optical system is determined to have an imaging distance far enough that a driver viewing visual information while driving will not be hazardous while driving. However, the larger the viewing angle of view, the greater the amount of light that the HUD system receives from an external light source, and the longer the imaging distance, the higher the density at which external light is condensed.

[0046] Light may be incident from the outside of a vehicle including a vehicle HUD system that does not use a light blocking film according to an embodiment. The light incident from the outside of the vehicle to the inside of the vehicle includes light 110 in a first direction incident in the forward field of view of the vehicle toward a windshield 150 of the vehicle, and light 120 in a second direction incident from an external light source at a specific position.

[0047] The forward field of view of the vehicle to which the first direction light 110 corresponds may be determined in consideration of the expected line of sight of the driver of the vehicle. According to an embodiment, the expected line of sight of the driver may be determined as the individual line of sight of the main driver or the line of sight of a general person. For example, the expected line of sight of the driver may be determined in consideration of the physique, sitting height, and field of vision of the main driver or a general person.

[0048] According to one embodiment, the vehicle front glass window 150 may be a double-glazed glass window including a windshield and an inner glass layer. The windshield corresponds to the outer glass window of the double glass with respect to the vehicle occupant, and the inner glass layer corresponds to the inner glass window of the double glass with respect to the vehicle occupant.

[0049] A double-glazed glass window has better heat retention and sound absorption than a single pane of glass. In addition, if an additional material such as plastic is inserted between the windshield and the inner glass layer, even if the glass window breaks, the fragments are relatively contained, thereby ensuring the safety of the vehicle occupants.

[0050] Hereinafter, an embodiment will be described in which the vehicle front glass window 150 has a double glass structure including a windshield and an inner glass layer, however, this is merely an example, and the embodiment described below may also be applied to a case where the vehicle front glass window 150 is a single glass window, etc.

[0051] The second direction light 120 is light corresponding to an external light source located on an extension of the path of light output from the display panel 140 installed in the vehicle. Specifically, when an external light source (e.g., the sun) is located on an extension of the traveling path of the light output from the display panel 140 installed in the vehicle before it is reflected in the driver's field of vision direction by a windshield or an internal glass layer, the second direction light 120 is light output from the external light source to be parallel to the extension and incident in the direction of the vehicle. In this case, the extension of the traveling path of the light output from the display panel 140 before it is reflected in the driver's field of vision direction by a windshield or an internal glass layer and the light output from the external light source and incident in the direction of the vehicle are parallel. However, the traveling direction of the traveling path of the light output from the display panel 140 before it is reflected in the driver's field of vision direction by a windshield or an internal glass layer and the traveling direction of the light output from the external light source and incident in the direction of the vehicle may be opposite to each other.

[0052] The more the first direction light 110 incident in the forward viewing direction of the vehicle penetrates into the interior of the vehicle, the more visibility the driver and other passengers of the vehicle can have outside the vehicle. In order to ensure driving safety, the ratio of the first direction light 110 that is transmitted from the outside of the vehicle to the inside of the vehicle (hereinafter, referred to as transmittance) should be equal to or greater than a predetermined threshold value. For example, vehicles operating in Korea must satisfy a transmittance of 70% or more for light incident in the forward viewing direction of the vehicle according to traffic regulations.

[0053] The more the second direction light 120 entering from an external light source at a specific position enters the vehicle interior, the higher the probability of damaging the display panel 140 or the faster the damage to the display panel 140 occurs. Therefore, it is preferable that more of the second direction light 120 is blocked. As will be described later, the light blocking film for HUD can efficiently block the second direction light 120.

[0054] The more the third direction light 130 is output from the display panel and directed toward the field of vision of the driver, the more visibility of the provided visual information can be ensured. In order for the third direction light 130 to enter the field of vision of the vehicle occupant, the light 130 must be reflected in the third direction from the front glass window 150 (e.g., a windshield or an inner glass layer) of the vehicle. In order to ensure visibility of the visual information provided by the display panel, a certain ratio or more of the output light must be reflected from the front glass window 150 of the vehicle. However, the visibility of the third direction light 130 can also be ensured by adjusting the output intensity of the light output from the display panel 140.

[0055] FIG. 2 is a diagram for explaining an effect of using a light blocking film for HUD in a vehicle HUD system according to an embodiment.

[0056] 2, a system for a vehicle HUD using a light blocking film for a HUD according to an embodiment includes a display panel, a magnifying optical system, and a light blocking film for a HUD. The display panel corresponds to the display panel 140 shown in FIG. 1, and the magnifying optical system corresponds to the magnifying optical system shown in FIG.

[0057] When a light blocking film for HUD is used in a vehicle HUD system, similar to the case of a vehicle HUD system not using a light blocking film shown in FIG. 1, light in a first direction 110 shown in FIG. 1 and light in a second direction 120 shown in FIG. 1 may be incident from the outside toward the front windshield of the vehicle.

[0058] The light blocking film for HUD transmits light in a first direction 110 corresponding to the forward field of view of the vehicle, while blocking light in a second direction 120 corresponding to an external light source located on an extension line of the light path containing visual information. By appropriately designing and arranging the light blocking film for HUD, the transmittance of the light 110 in the first direction can be equal to or greater than a predetermined threshold value while at least a portion of the light 120 in the second direction is blocked by the light blocking film for HUD, and a certain percentage or more of the light 130 in the third direction can be reflected from the windshield of the vehicle.

[0059] FIG. 3 is a diagram illustrating a configuration of a light blocking film for a HUD according to an embodiment.

[0060] Referring to FIG. 3, the light blocking film for HUD according to an embodiment includes a light blocking portion 310. The light blocking portion 310 includes a transparent material 311 filling spaces between a plurality of light shielding materials 312. The plurality of light shielding materials 312 serve to block light reaching the light blocking portion 310. For example, light 350 reaching the plurality of light shielding materials 312 at an angle close to perpendicular to the inclination at which the plurality of light shielding materials 312 are arranged may be absorbed and blocked. The transparent material 311 transmits light, and light 340 incident on the transparent material 311 parallel to the inclination at which the plurality of light shielding materials 312 are arranged may pass through the transparent material 311 without reaching the plurality of light shielding materials 312.

[0061] The transparent material 311 is a material that fills spaces between the plurality of light blocking materials 312 and helps the plurality of light blocking materials 312 to block light. The transparent material 311 plays a role in physically fixing the plurality of light blocking materials 312 so that the plurality of light blocking materials 312 have a specific inclination and / or absorbs at least a part of an impact applied to the light blocking material 312, thereby protecting the plurality of light blocking materials 312 from external impact and extending the life of the light blocking film for HUD.

[0062] The light blocking film for HUD may be disposed between the windshield and the inner glass layer of the vehicle, disposed outside the windshield of the vehicle, or disposed inside the inner glass layer of the vehicle. Also, the light blocking film for HUD may be disposed over the entire front glass window of the vehicle and positioned to correspond only to a portion of the front glass window where the light output from the display panel 140 is incident.

[0063] Further details regarding various configurations of light blocking films for HUDs will be described below with reference to FIGS.

[0064] In order to reflect light output from the display panel, the light blocking film for HUD may further include a light reflecting material 330. In this case, the light reflecting material 330 may be disposed below the light blocking portion 310.

[0065] In order to protect the vehicle, passengers, and light blocking portion 310 from the external environment, the light blocking film for HUD may further include a light transmitting material 320. In this case, the light transmitting material 320 may be disposed on the upper side of the light blocking portion 310 opposite to the light reflecting material 330. The external environment may include external objects and energy (such as impact) transmitted from the outside.

[0066] However, the light reflecting material 330 and the light transmitting material 320 are not necessarily included in the light blocking film for HUD. At least a part of the functions of the light reflecting material 330 and the light transmitting material 320 may be performed by other components of the vehicle. As an example, if the windshield serves to protect the vehicle, passengers, and the light blocking film for HUD from the external environment and the blocking film is located inside the windshield (based on the passengers of the vehicle), the light transmitting material 320 may not be required. As another example, if the interior glass layer (cover layer) of the vehicle serves to reflect light output from the display panel and the blocking film is located outside the interior glass layer of the vehicle (based on the passengers of the vehicle), the light reflecting material 330 may not be required.

[0067] FIG. 4 is a diagram illustrating a design of a light blocking film for a HUD according to an embodiment.

[0068] Referring to FIG. 4, the light blocking film for HUD according to an embodiment has a plurality of light blocking materials arranged in a slant direction (hereinafter, TIFF0007632795000001.tif76), the spacing between the multiple light blocking materials (hereinafter, referred to as d), and the thickness of the light blocking portion (hereinafter, referred to as t). TIFF0007632795000002.tif76 is a value that is determined depending on how much the light blocking film for the HUD is tilted counterclockwise based on the bottom surface of the film.

[0069] TIFF0007632795000003.tif65, d and t are determined taking into consideration a target transmittance of the light 110 in the first direction and a target shading ratio of the light 120 in the second direction. The target transmittance is the transmittance of the light 110 in the first direction to be achieved through the design of the light blocking film for the HUD, and is set to a value equal to or greater than a threshold transmittance required to ensure driving safety. The target shading ratio is the ratio at which the light 120 in the second direction is blocked to be achieved through the design of the light blocking film for the HUD, and is set to a value required to prevent damage to the display panel.

[0070] According to one embodiment, the light blocking film for HUD comprises: TIFF0007632795000004.tif56 exceeded TIFF0007632795000005.tif56 (provided that TIFF0007632795000006.tif66< TIFF0007632795000007.tif56). In this case, TIFF0007632795000008.tif66 and TIFF0007632795000009.tif56 is a value that is determined depending on how much the HUD light blocking film is tilted counterclockwise based on the bottom surface of the film.

[0071] TIFF0007632795000010.tif66, The geometric relationship between TIFF0007632795000011.tif64, d, and t is as follows:

[0072]

number

[0073]

number

[0074]

number

[0075]

number

[0076] TIFF0007632795000028.tif65 TIFF0007632795000029.tif66 and When the light has a value between 0 and 1, the transmittance of light entering the light blocking film is expressed by the following Equation (5).

[0077]

number

[0078] Based on formulas (1) to (5), which angle of light is allowed to pass and which angle of light is blocked TIFF0007632795000033.tif67 and TIFF0007632795000034.tif67, and the setting value for the transmittance of light to be passed through According to TIFF0007632795000035.tif710, TIFF0007632795000036.tif76, d and t can be determined. Based on TIFF0007632795000037.tif65, d and t, a light blocking film for HUD can be designed.

[0079] According to one embodiment, the inclination of the light-blocking material may be designed to have a value between 40 degrees and 85 degrees, the spacing between the light-blocking material may be designed to have a value between 0.3 mm and 0.5 mm, and the thickness of the light-blocking film may be designed to have a value between 0.35 mm and 0.40 mm, for example, about 0.38 mm.

[0080] FIG. 5 is a view illustrating a case where a light blocking film for a HUD according to an embodiment is positioned inside a front windshield of a vehicle.

[0081] 5, the light blocking film for HUD according to an embodiment may be disposed on the inside of a front glass window. When the light blocking film is disposed on the inside of the front glass window, the light 130 in the third direction may enter the light blocking film for HUD before the front glass window. Therefore, the lower part of the light blocking film for HUD may include a material having a light reflecting property.

[0082] On the other hand, when the HUD light blocking film is located inside the windshield, the windshield plays a role in protecting the vehicle, passengers, and the HUD light blocking film from the external environment. Therefore, in this case, the light transmitting material is not necessarily included in the HUD light blocking film.

[0083] The light 120 in the second direction is absorbed by the light blocking materials and cannot enter the inside of the front glass window, so that it cannot damage the display panel.

[0084] FIG. 6 is a view illustrating a case where a light blocking film for a HUD according to an embodiment is disposed between double glass panes of a front glass window of a vehicle.

[0085] 6, the light blocking film for HUD according to an embodiment may be located between the double glass of a front glass window. Specifically, the light blocking film for HUD may be provided between a windshield 610 and an inner glass layer 620. When the light blocking film for HUD is located between the windshield and the inner glass layer, the inner glass layer plays a role in reflecting light output from a display panel. Therefore, when the light blocking film for HUD is located between the windshield 610 and the inner glass layer 620, a light reflecting material is not necessarily included in the light blocking film for HUD.

[0086] In addition, when the light blocking film for HUD is located between the windshield 610 and the inner glass layer 620, the windshield can protect the vehicle, passengers, the light blocking film for HUD, etc. from the external environment. Therefore, when the light blocking film for HUD is located between the windshield 610 and the inner glass layer 620, a light-transmitting material is not necessarily included in the light blocking film for HUD.

[0087] When the light blocking film for HUD is positioned between the windshield 610 and the inner glass layer 620, the light blocking film for HUD can relatively reduce the range of flying fragments even if the glass window is broken. In other words, when the light blocking film for HUD is positioned between the windshield 610 and the inner glass layer 620, it can be beneficial to the safety of vehicle occupants.

[0088] The light blocking film for HUD according to an embodiment may be located on the outside of the windshield. In this case, the light blocking film for HUD is exposed to the external environment before the windshield. Therefore, the upper end of the light blocking film for HUD may include a material having a property of protecting an object from the external environment. In this case, the material having a property of protecting an object from the external environment should basically also have a property of transmitting light since it should not interfere with driving.

[0089] Meanwhile, when the light blocking film for HUD is positioned on the outside of the front glass window, the front glass window plays a role in reflecting the light output from the display panel, so in this case, the light reflecting material is not necessarily included in the light blocking film for HUD.

[0090] In order to ensure maximum transparency for the first direction light 110, the driver's line of sight and the plurality of light blocking materials must be parallel. The angle between the driver's line of sight and the front glass window may vary depending on the height of the front glass window, and when the plurality of light blocking materials are designed to be parallel to such various line of sight directions, the plurality of light blocking materials may not be parallel to each other but may have different inclinations 630 depending on the position. This will be described in more detail later with reference to FIG. 8.

[0091] FIG. 7A is a diagram illustrating the propagation of light when a plurality of light blocking materials according to an embodiment have the property of polarizing light.

[0092] 7A, the light blocking film for HUD according to an embodiment may have a property of polarizing light instead of completely absorbing and blocking light. The second direction light 120 reaching a material having a property of polarizing light among the light blocking materials passes through the light blocking material while being polarized to a specific polarity. When the second direction light 120 is polarized, only one of the p-polarized and s-polarized components enters the vehicle interior, thereby reducing the amount of light by about 50%.

[0093] When the light blocking materials have a property of polarizing light instead of completely blocking it, there is an advantage that the light 110 in the first direction is not completely blocked even when it reaches the light blocking materials, and only the polarized component reaches the field of vision of the passenger. Meanwhile, the light 120 in the second direction that enters the inside of the vehicle can be blocked from the display panel by the method presented with reference to FIG. 7B.

[0094] FIG. 7B is a diagram illustrating a HUD system in which multiple light blocking materials have light polarizing properties according to an embodiment.

[0095] Referring to FIG. 7B, when multiple light-blocking materials according to an embodiment have the property of polarizing light instead of completely blocking it, light 120 in a second direction can pass through the light-blocking material while being polarized with a particular polarity.

[0096] When the second direction light 120 is polarized, only one of the p-polarized and s-polarized components enters the vehicle interior, reducing the amount of light by about 50%. According to an embodiment, reducing the amount of second direction light 120 shown in FIG. 1 by about 50% is not enough to prevent damage to the display panel.

[0097] In this case, a material 720 having a property of polarizing light may be further provided on the path of the light output from the display panel in order to block the second direction light 120 entering the inside of the vehicle. Specifically, when the plurality of light blocking materials absorb s-polarity light while passing p-polarity light, a material that passes s-polarity light while absorbing p-polarity light may be further provided on the path of the light output from the display panel. Alternatively, when the plurality of light blocking materials absorb p-polarity light while passing s-polarity light, a material that passes p-polarity light while absorbing s-polarity light may be further provided on the path of the light output from the display panel.

[0098] By further providing a material 720 having light polarizing properties on the path of the light output from the display panel, the second direction light 120 entering the interior of the vehicle (see FIG. 7A) can be prevented from entering the display panel, while maintaining the advantage that the first direction light 110 is not completely blocked even when it reaches multiple light blocking materials, allowing the polarized component to reach the occupant's field of vision.

[0099] FIG. 8 is a diagram for explaining the line of sight of a passenger in a vehicle according to one embodiment.

[0100] 8, the line of sight of a vehicle occupant according to an embodiment is as shown in the drawing. Specifically, depending on where the vehicle occupant is looking, the angle between the line of sight of the vehicle occupant looking upward and the windshield and the angle between the line of sight of the vehicle occupant looking downward may be different.

[0101] Considering that the angle between the line of sight of the vehicle occupant and the windshield may change depending on where the vehicle occupant is looking, multiple inclinations of the light blocking material may be determined. The inclinations of the light blocking material may be determined to be parallel to various lines of sight of the vehicle occupant. In this case, the inclinations of the light blocking material may change depending on the position of the light blocking material. Alternatively, the inclinations of the light blocking material may be determined to be the same.

[0102] When the inclinations of multiple light blocking materials are determined to be different so as to be parallel to the line of sight of the vehicle passengers, there is an advantage that the light 110 in the first direction shown in FIG. 1 can be transmitted more smoothly from the outside of the vehicle to the inside of the vehicle than when the light blocking materials have the same inclination.

[0103] When the inclinations of a plurality of light blocking materials are determined to be parallel to each other, the design is simpler and more cost-effective than when the inclinations are determined differently to be parallel to the line of sight of the vehicle passengers.

[0104] FIG. 9 is a diagram illustrating a shape of a light blocking film for HUD according to an embodiment arranged on a front windshield of a vehicle.

[0105] 9, the light blocking film for HUD according to an embodiment may be disposed on the windshield of a vehicle. Depending on the design, the light blocking film for HUD may be disposed inside or outside along the surface of the windshield of the vehicle, or may be inserted between the double glass structure of the windshield. In either case, the plurality of light blocking materials are disposed in a stepped manner (910) corresponding to the first direction 110.

[0106] The HUD light blocking materials of the HUD light blocking film may be arranged parallel to each other. According to one embodiment, the HUD light blocking film is arranged over the entire front windshield of the vehicle, so that the passenger in the front seat of the vehicle can have the same field of view as the driver of the vehicle.

[0107] FIG. 10 is a view illustrating a shape of a light blocking film for HUD according to an embodiment, which is positioned to correspond only to a portion of a front glass window of a vehicle where light output from a display panel is incident.

[0108] Referring to FIG. 10, a light blocking film for a HUD according to an embodiment is disposed (1010) so as to correspond only to a portion of a front glass window of a vehicle where light output from a display panel is incident.

[0109] Although the embodiments have been described above with reference to the illustrative drawings, those skilled in the art can apply various technical modifications and variations based on the above. Therefore, the scope of the present invention is not limited to the disclosed embodiments, but is defined by the claims and equivalents thereof. [Explanation of symbols]

[0110] 110 Light in the first direction 120 Second direction light 130 Third Light 140 Display Panel 150 Front glass window 310 Light blocking section 311 Transparent material 312 Light blocking material 320 Light-transmitting material 330 Light-reflecting material 610 Windshield 620 Inner Glass Layer

Claims

1. a plurality of light shielding materials that transmit light in a first direction propagating in a first direction from a forward field of view of the vehicle and block at least a portion of light in a second direction propagating from an external light source in a second direction opposite to a third direction output from a display panel for a HUD provided in the vehicle; a transparent material filling spaces between the plurality of light blocking materials; Including, At least one of the plurality of light blocking materials is oriented parallel to the first direction; The light blocking film for a HUD, wherein the plurality of light blocking materials are configured to polarize light.

2. The light blocking film for a HUD according to claim 1 , wherein at least some of the plurality of light blocking materials are parallel to each other.

3. 3. The light blocking film for HUD according to claim 1 or 2, wherein the inclination of the light blocking material is between 40 degrees and 85 degrees with respect to the lower surface of the light blocking film for HUD.

4. The light blocking film for HUD according to any one of claims 1 to 3, wherein the spacing between the light blocking materials is between 0.3 mm and 0.5 mm.

5. The light-blocking film for a HUD according to any one of claims 1 to 4, wherein the thickness of the light-blocking film is 0.35 mm to 0.40 mm.

6. 6. The light blocking film for a HUD according to claim 1, further comprising a light reflecting material provided on the plurality of light blocking materials and the transparent material to reflect light output from the display panel.

7. 7. The light blocking film for HUD according to claim 1, further comprising a light-transmitting material provided on the plurality of light blocking materials and the transparent material to protect the vehicle from an external environment.

8. The light blocking film for a HUD according to claim 1 , wherein the plurality of light blocking materials absorb a portion of light that reaches the plurality of light blocking materials.

9. a display panel that outputs light containing visual information; a magnifying optical system for magnifying and displaying the visual information; a light blocking film including a plurality of light blocking materials that transmit light in a first direction propagating in a first direction from a forward field of view of the vehicle, while blocking at least a portion of light in a second direction propagating from an external light source in a second direction opposite to a third direction in which light including the visual information output from the display panel is output; Including, At least one of the plurality of light blocking materials is oriented parallel to the first direction; The plurality of light blocking materials are configured to polarize light.

10. 10. The vehicle HUD system of claim 9, wherein at least some of the plurality of light blocking materials are parallel to one another.

11. 10. The vehicle HUD system of claim 9, wherein at least some of the light blocking materials have different orientations relative to one another.

12. 12. The vehicle HUD system of claim 9, wherein at least a portion of the light containing the visual information output from the display panel is reflected by a transparent layer adjacent to the light blocking film.

13. 13. The vehicle HUD system according to claim 9, wherein the inclination of the light blocking material is between 40 degrees and 85 degrees with respect to the lower surface of the light blocking film for the HUD.

14. 14. The vehicle HUD system of claim 9, wherein the spacing of the light blocking material is between 0.3 mm and 0.5 mm.

15. 15. The vehicle HUD system according to claim 9, wherein the thickness of the light blocking film is between 0.35 mm and 0.40 mm.

16. 16. The vehicle HUD system of claim 9, wherein the light blocking film further comprises a light reflective material provided on a first surface of the light blocking film to reflect light output from the display panel.

17. 17. The vehicle HUD system according to claim 9, wherein the light-blocking film further comprises a light-transmitting material provided on a second surface of the light-blocking film to protect the vehicle from an external environment.

18. A vehicle HUD system as described in any one of claims 9 to 17, further comprising a material having properties that polarize light on the path of the light output from the display panel.

19. the plurality of light blocking materials polarizing s-polarized light while passing p-polarized light; 20. The vehicle HUD system of claim 18, wherein the material of said properties polarizes p-polarized light while passing s-polarized light.

20. the plurality of light blocking materials polarizing p-polarized light while passing s-polarized light; 20. The vehicle HUD system of claim 18, wherein the material with polarizing properties polarizes s-polarized light while passing p-polarized light.

21. 21. The vehicle HUD system of claim 9, wherein the plurality of light blocking materials absorb a portion of the light reaching the plurality of light blocking materials.

22. 22. The vehicle HUD system of claim 9, wherein the light blocking film is located between a windshield and an interior glass layer of the vehicle, on the outside of the vehicle windshield, or on the inside of the interior glass layer.

23. 23. The vehicle HUD system according to claim 9, wherein the light blocking film is positioned to correspond to a portion of a windshield window of the vehicle where the light output from the display panel is incident.

24. 24. The vehicle HUD system of claim 9, wherein the external light source corresponds to the sun.

25. The light blocking film for a HUD according to claim 1 , wherein the inclination of the light blocking materials varies depending on the position of the light blocking materials in the light blocking film for a HUD.

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