Head-up display system

Abstract

The utility model relates to a head-up display system. The head-up display system comprises a backlight module, a display panel and a polarizing element. The backlight module comprises a substrate and a plurality of LED light sources, the LED light sources are arranged on the substrate, and each LED light source is an integrated lens light source. The display panel is obliquely arranged relative to the backlight module. The polarizing element is arranged between the backlight module and the display panel and used for deflecting normal light in light emitted by the LED light source or refracting normal light emitted by the deflected LED chip to form emergent light irradiated to the display panel in the preset direction. The polarization element is arranged to deflect the normal light of the LED light source or refract the normal light of the deflected LED chip, so that the emergent light of the polarization element irradiates the display panel in the preset direction, and the light intensity of the normal emergent light of the LED light source or the LED chip is higher than that of the corresponding lateral light. The emergent light formed after deflection can obviously improve the luminance of the display panel.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a head-up display system. Background Technology

[0002] Please see Figure 1 , Figure 1 The diagram illustrates the schematic of a conventional head-up display (HUD). A typical HUD includes a TFT (Thin Film Transistor) display panel 10, optical elements 12, and a backlight module 14. The optical elements 12 are located between the TFT display panel 10 and the backlight module 14. The TFT display panel 10 is tilted relative to the backlight module 14, and its display surface faces the driver for easier viewing of the displayed content.

[0003] The backlight module 14 includes a substrate 16, multiple LED light source devices 18, and a condenser lens 20. The multiple LED light source devices 18 are disposed on the substrate 16, and the condenser lens 20 is disposed on the substrate 18 and covers all the LED light source devices 18. The condenser lens 20 has multiple lens portions 22, which are arranged one-to-one with the multiple LED light source devices 18. The light emitted by each LED light source device 18 is focused by the corresponding lens portion 22, and after being processed by one or more optical elements 12, it is irradiated onto the TFT display panel 10 to provide backlight for the TFT display panel 10.

[0004] Because the TFT display panel 10 is tilted relative to the backlight module 14, the light emitted by the LED light source device 18, after passing through the condenser lens 20, optical element 12, and TFT display panel 10, is mainly its lateral light emission Ls, which enters the driver's visual range. The normal light emission Lo of the LED light source device 18 is emitted from the TFT display panel 10 along the normal direction. However, the luminous intensity of this lateral light emission Ls is relatively weak, resulting in insufficient product brightness. Summary of the Invention

[0005] Therefore, it is necessary to provide a head-up display system that addresses the problem of insufficient brightness in traditional head-up display systems.

[0006] A head-up display system, comprising:

[0007] A backlight module, the backlight module including a substrate and a plurality of LED light sources, the plurality of LED light sources being spaced apart on the substrate, each of the LED light sources being an integrated lens light source and including an LED chip;

[0008] A display panel, wherein the display panel is tilted relative to the backlight module; and

[0009] A polarizing element is disposed between the backlight module and the display panel to deflect the normal light emitted by the LED light source or to refract the normal light emitted by the LED chip after being deflected, thereby forming outgoing light that illuminates the display panel in a preset direction.

[0010] In one embodiment, each of the LED light sources further includes a bracket and a lens. The bracket is disposed on the substrate, and the lens is disposed on the bracket to form a light source cavity. The LED chip is disposed inside the bracket, located in the light source cavity, and spaced apart from the lens.

[0011] In one embodiment, in each of the LED light sources, the lens is asymmetrically arranged relative to the optical axis of the LED chip, and is used to deflect the normal emission of the LED chip toward the polarizing element.

[0012] In one embodiment, the polarizing element is configured such that the output light rays are perpendicular to the display panel in a predetermined direction.

[0013] In one embodiment, the polarizing element includes an element body and a plurality of microstructures. The element body has a first inclined surface, a second inclined surface, and a side surface. The first inclined surface and the second inclined surface are inclined relative to a horizontal plane. The side surface is connected between the first inclined surface and the second inclined surface. The plurality of microstructures are disposed on the second inclined surface. The first inclined surface is used to refract the normal light emitted by the LED light source or to refract the normal light emitted by the LED chip after being deflected, thereby forming a first deflected light. The second inclined surface is used to allow the first deflected light to be emitted perpendicularly to form the outgoing light, or to further refract the first deflected light to the same side to form a second deflected light, wherein the second deflected light is the outgoing light.

[0014] In one embodiment, the tilt angle θ1 of the first inclined surface relative to the horizontal plane is greater than the tilt angle θ2 of the second inclined surface.

[0015] In one embodiment, the first inclined surface and the second inclined surface extend in the same direction and intersect each other, and the direction of extension of the first inclined surface and the second inclined surface is opposite to the direction of their refracted light.

[0016] In one embodiment, the side surface includes two opposing trapezoidal surfaces and two opposing square surfaces, the trapezoidal surfaces being connected to the square surfaces, the trapezoidal surfaces having acute base angles and obtuse base angles, the acute base angles being formed by the first inclined surface and the base edge, and the obtuse base angles being formed by the second inclined surface and the base edge.

[0017] In one embodiment, the plurality of microstructures are arranged in an array, adjacent microstructures are connected, and the orthographic projection of each microstructure onto the second inclined surface is a parallelogram.

[0018] In one embodiment, the polarizing element includes an element body and a plurality of microstructures. The element body has a first inclined surface and a second horizontal surface. The first inclined surface is inclined relative to a horizontal plane, and the plurality of microstructures are disposed on the second horizontal surface. The first inclined surface is used to refract the normal light emitted by the LED light source or to refract the normal light emitted by the LED chip after being deflected, thereby forming a first deflected light ray. The second horizontal surface is used to further refract the first deflected light ray to the same side to form a second deflected light ray, and the second deflected light ray is the emitted light ray.

[0019] The aforementioned head-up display system, by placing a polarizing element between the display panel and the backlight module, can deflect the normal light emitted by the LED light source or refract the deflected normal light emitted by the LED chip. This allows the emitted light to illuminate the display panel along a preset direction. Since the luminous intensity of the normal emitted light from the LED light source or LED chip is higher than that of the corresponding lateral emitted light, the deflected emitted light significantly improves the brightness of the display panel. Moreover, after the normal light from the LED light source is refracted by the polarizing element, most of the emitted light can enter the driver's visual range and be observed, greatly reducing light waste and significantly improving luminous efficiency. This avoids the phenomenon where some light emitted along the normal direction from the display panel is wasted outside the driver's visual range.

[0020] The LED light source in the backlight module is an integrated lens light source, meaning the LED light source integrates the lens, eliminating the need for the separate focusing lens found in traditional head-up display backlight modules. This significantly reduces the size of the backlight module, simplifies its structure, and lowers costs. Furthermore, because the LED light source is an integrated lens light source, the light emitted by the LED chip is essentially captured by the integrated lens, avoiding the waste of large-angle lateral light emission, improving light extraction and utilization rates, resulting in higher luminous efficacy. This also overcomes the problem of traditional separate focusing lenses being unable to capture large-angle lateral light emission and causing crosstalk. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a traditional head-up display system.

[0022] Figure 2 This is a schematic diagram of the head-up display system in the first embodiment of this application.

[0023] Figure 3 for Figure 2 A schematic diagram of the polarizing element in a head-up display system.

[0024] Figure 4 for Figure 3 Side view of a medium polarizing element.

[0025] Figure 5 for Figure 3 Orthographic projection of the microstructure of the medium polarizing element onto the second inclined surface.

[0026] Figure 6 This is a schematic diagram of the head-up display system in the second embodiment of this application.

[0027] Figure 7 This is a schematic diagram of the head-up display system in the third embodiment of this application.

[0028] Figure 8 This is a schematic diagram of the head-up display system in the fourth embodiment of this application.

[0029] Figure 9 for Figure 8 A schematic diagram of the polarizing element in a head-up display system.

[0030] Explanation of reference numerals in the attached figures:

[0031] Background technology: 10-TFT display panel; 12-optical components; 14-backlight module; 16-substrate; 18-LED light source device; 20-condensing lens; 22-lens section; Ls-side emission; Lo-normal emission;

[0032] Detailed Implementation: 100-Heads-Up Display System; 110-Backlight Module; 111-Substrate; 112-LED Light Source; 113-LED Chip; 114-Bracket; 115-Lens; 116-Light Source Cavity; 117-Transparent Adhesive Layer; 118-First Part; 119-Second Part; 120-Display Panel; 130-Polarizing Element; 131-Element Body; 132-Microstructure; 133-First Inclined Surface; 134-Second Inclined Surface; 135-Side Surface; 136-Trapezoidal Surface; 137-Orthographic Projection; 138-Long Side; 139-Short Side; 140-Diffuser Element; 142-Second Horizontal Surface; L1-First Deflected Ray; L2-Second Deflected Ray; P-Horizontal Plane. Detailed Implementation

[0033] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0034] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0035] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0038] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0039] Please see Figure 2 , Figure 2 A schematic diagram of a head-up display system according to a first embodiment of this application is shown. The head-up display system 100 provided in the first embodiment of this application includes a backlight module 110, a display panel 120, and a polarizing element 130. The polarizing element 130 is disposed between the backlight module 110 and the display panel 120. The backlight module 110 includes a substrate 111 and a plurality of LED light sources 112. The plurality of LED light sources 112 are spaced apart on the substrate 111. Each LED light source 112 is an integrated lens light source and includes an LED chip 113. The display panel 120 is tilted relative to the backlight module 110. The polarizing element 130 is used to deflect the normal light rays emitted by the LED light sources 112, thereby forming outgoing light rays that illuminate the display panel 120 in a preset direction.

[0040] By placing a polarizing element 130 between the display panel 120 and the backlight module 110, the polarizing element 130 can deflect the normal light emitted by the LED light source 112, so that its emitted light shines onto the display panel 120 in a preset direction. Since the luminous intensity of the normal emitted light of the LED light source 112 is higher than that of the corresponding lateral emitted light, the emitted light formed after being deflected can significantly improve the luminous brightness of the display panel 120. Moreover, after the normal light of the LED light source 112 is refracted by the polarizing element 130, most of the emitted light can enter the driver's visual range and be observed, greatly reducing light waste and significantly improving light efficiency. This avoids the phenomenon that some light emitted from the display panel 120 in the normal direction is wasted because it is outside the driver's visual range.

[0041] Furthermore, the LED light source 112 of the backlight module 110 is an integrated lens light source, meaning that the LED light source 112 integrates a lens, eliminating the need for the separate focusing lens found in traditional head-up display backlight modules. This significantly reduces the size of the backlight module 110, simplifies its structure, and lowers costs. Simultaneously, because the LED light source 112 is an integrated lens light source, the light emitted by the LED chip 113 is essentially collected by the integrated lens, avoiding the waste of large-angle lateral light emission, improving light extraction and utilization rates, resulting in higher luminous efficiency. This also improves upon the inability of the lens portion of traditional separate focusing lenses to collect large-angle lateral light emission and the resulting crosstalk.

[0042] It should be noted that the normal rays emitted by the LED light source 112 include rays emitted along its optical axis and rays emitted parallel to the optical axis. The preset direction is determined by the horizontal tilt angle of the display panel 120, and it changes with the horizontal tilt angle, which in turn depends on the driver's viewing angle.

[0043] The substrate 111 of the backlight module 110 can be a board with circuitry (not shown), which not only serves to support the LED light source 112, but also allows the LED light source 112 to be electrically connected to external circuitry through the circuitry. The substrate 111 can be, but is not limited to, a circuit board.

[0044] Each LED light source 112 also includes a bracket 114 and a lens 115. The bracket 114 is disposed on the substrate 111, and the lens 115 is disposed on the bracket 114 to form a light source cavity 116. The LED chip 113 is disposed within the bracket 114, located in the light source cavity 116, and spaced apart from the lens 115. Because the distance between the light-incident surface of the lens 115 and the LED chip 113 is small, the main part of the light emitted by the LED chip 113 can enter the lens 115, thereby improving the utilization rate of the light emitted by the LED chip 113. At the same time, due to the presence of the light source cavity 116, the light-incident surface of the lens 115 can be set as a free-form surface, thereby improving the light control capability of the LED light source 112. In an alternative embodiment, each LED light source 112 does not have a support 114, and its lens 115 is directly disposed on the substrate 111 to form a light source cavity 116. The LED chip 113 is disposed on the substrate 111, located in the light source cavity 116, and spaced apart from the lens 115. The lens 115 may have a concave space or a support portion, and together with the substrate 111, it forms the light source cavity 116. The support portion is supported on the substrate 111.

[0045] Furthermore, the bracket 114 is provided with a reflective groove (not labeled), and the LED chip 113 is located in the reflective groove. The side of the reflective groove is a reflective surface, which can reflect the large-angle lateral light emission of the LED chip 113 and allow it to enter the lens 115, thereby further improving the light emission utilization rate of the LED chip 113 and avoiding the waste of large-angle lateral light emission.

[0046] Furthermore, the light-emitting surface of lens 115 is a convex curved surface, which serves as a light-focusing surface, replacing the traditional split-type condensing lens, and preventing light leakage between adjacent lenses 115. It is understandable that the light-incident surface of lens 115 can be set as a convex curved surface according to actual needs, forming a biconvex lens with even better light-focusing effect.

[0047] Please see Figure 3 and Figure 4 , Figure 3 A schematic diagram of the polarizing element of the head-up display system in this embodiment is shown. Figure 4 It shows Figure 3 A side view of the intermediate polarizing element, combined with... Figure 2The polarizing element 130 is configured such that the preset direction of the emitted light is perpendicular to the display panel 120. That is, the emitted light, deflected by the polarizing element 130, is perpendicular to the display panel 120, ensuring that both rays enter the driver's visual range, resulting in higher luminous efficiency and better product brightness. It should be noted that the preset direction is perpendicular to the display panel 120. This "perpendicular" should be understood as substantially perpendicular or roughly perpendicular, not limited to a strict 90° angle. Furthermore, since the driver's visual range can change with head movement, a preset direction can be considered as one that fluctuates by ±10° from the direction perpendicular to the display panel 120.

[0048] The polarizing element 130 includes an element body 131 and a plurality of microstructures 132. The element body 131 has a first inclined surface 133, a second inclined surface 134, and a side surface 135. The first inclined surface 133 and the second inclined surface 134 are inclined relative to the horizontal plane P. The side surface 135 connects the first inclined surface 133 and the second inclined surface 134. The plurality of microstructures 132 are disposed on the second inclined surface 134. The first inclined surface 133 is used to refract the normal light rays emitted by the LED light source 112 to form a first deflected light ray L1. The second inclined surface 134 is used to further refract the first deflected light ray L1 to the same side to form a second deflected light ray L2, and the second deflected light ray L2 is the outgoing light ray. The normal light emitted by the LED light source 112 is refracted twice by the first inclined surface 133 and the second inclined surface 134, and can then shine onto the display panel 120 in a preset direction, thereby improving the brightness of the display panel 120. Moreover, the normal light is refracted twice, and its final refraction angle is larger, so as to meet the polarization illumination of different deflection angles.

[0049] It should be noted that when the bundled second deflected light L2 passes through the microstructure 132, the microstructure 132 can scatter a small portion of the bundled second deflected light L2, causing the scattered light between adjacent microstructures 132 to mix and play a role in homogenizing the light. However, the main part of the bundled second deflected light L2 will still pass through the microstructure 132 in its original direction.

[0050] Relative to the horizontal plane P, the tilt angle θ1 of the first inclined surface 133 is greater than the tilt angle θ2 of the second inclined surface 134. The tilt degree of the first inclined surface 133 and / or the second inclined surface 134 can be flexibly adjusted to obtain the required final deflection angle to meet the requirements of different deflection angles.

[0051] The first inclined surface 133 and the second inclined surface 134 extend in the same direction and intersect, but their extending directions are opposite to the direction of their refracted light rays. Please refer to... Figure 2The first inclined surface 133 and the second inclined surface 134 extend to the right and intersect, while the normal ray refracts to the left. Both the first inclined surface 133 and the second inclined surface 134 can be regarded as being inclined upward relative to the horizontal plane P, and the inclination of the first inclined surface 133 is greater than that of the second inclined surface 134, so that the first inclined surface 133 and the second inclined surface 134 can extend to the right and intersect.

[0052] In other words, the side surface 135 of the component body 131 has a trapezoidal surface 136, the two sides of which can extend and intersect along the top. Specifically, the side surface 135 of the component body 131 includes two opposing trapezoidal surfaces 136 and two opposing square surfaces (not labeled), the trapezoidal surfaces 136 being connected to the square surfaces. The trapezoidal surface 136 has an acute base angle and an obtuse base angle, the acute base angle being formed by a first inclined surface 133 and the base edge, and the obtuse base angle being formed by a second inclined surface 134 and the base edge.

[0053] Either the first inclined surface 133 or the second inclined surface 134 can be configured as a plane or a concave curved surface. The concave curved surface is a slightly concave surface, but it is still inclined overall. In this embodiment, both the first inclined surface 133 and the second inclined surface 134 are configured as planes. The planar second inclined surface 134 helps to reduce the processing difficulty of the microstructure 132. In other embodiments, the first inclined surface 133 can be a concave curved surface, which helps to improve the deflection effect of the first inclined surface 133 on incident light, while the second inclined surface 134 is a plane.

[0054] Please see Figure 5 , Figure 5 This diagram shows an orthographic projection of the microstructure of the polarizing element of the head-up display system in this embodiment onto the second inclined surface, in conjunction with... Figure 2 and Figure 3 Multiple microstructures 132 are arranged in an array, with adjacent microstructures 132 connected together. Each microstructure 132 can scatter a small portion of the second deflected light beam L2 and the lateral emission from the light source, thereby improving the light mixing effect between adjacent microstructures 132 and making the light output of the polarizing element 130 more uniform and brighter. It is understood that in other embodiments, the multiple microstructures 132 may be distributed in other regular shapes or irregularly, and adjacent microstructures 132 may be connected to or spaced apart from each other.

[0055] The arrayed microstructures 132 occupy an area on the second inclined surface 134 surrounded by blank edge regions (not labeled). Each microstructure 132 protrudes from the second inclined surface 134, and its light-emitting surface is a convex curved surface. The blank edge regions on the second inclined surface 134 can meet assembly requirements, through which the polarizing element 130 can be assembled onto the mounting structure. In an alternative embodiment, the arrayed microstructures 132 can cover the entire second inclined surface 134, and the side surface 135 of the polarizing element 130 can serve as a mounting surface for mounting the polarizing element 130.

[0056] Each microstructure 132's orthographic projection 137 on the second inclined surface 134 is a parallelogram, allowing for seamless splicing between adjacent microstructures 132. This increases the number of microstructures 132 per unit area, further enhancing the light scattering effect and improving the light mixing effect between adjacent microstructures 132, resulting in more uniform overall light distribution and higher brightness. It should be noted that the orthographic projection 137 of the microstructure 132 on the second inclined surface 134 is the projection formed on the second inclined surface 134 by light rays perpendicular to the second inclined surface 134 striking the microstructure 132.

[0057] Furthermore, the multiple microstructures 132 are arranged in a rectangular array with both length and width directions. The orthographic projection 137 of each microstructure 132 is rectangular, with the long side 138 of the orthographic projection 137 located in the length direction and the short side 139 located in the width direction. Each microstructure 132 can scatter more light in the length direction, and the emitted light is more divergent. The emitted light from adjacent microstructures 132 is fully mixed, and the total internal reflection effect of each microstructure 132 in the length direction is enhanced, thereby increasing the amount of light propagating along the length direction inside the polarizing element 130. This significantly improves the overall brightness of the polarizing element 130. When the driver views the display panel 120, the display panel 120 has high brightness and no bright spots, improving the glare phenomenon caused by bright spots. In other embodiments, the multiple microstructures 132 can also be arranged in a ring array or a square array, and the orthographic projection 137 of each microstructure 132 on the second inclined surface 134 can also be a square, rhombus, or other parallelogram.

[0058] The polarizing element 130 is a single-piece structure, meaning the main body 131 and multiple microstructures 132 can be integrally molded. Compared to separate structures, this eliminates the need for assembly, resulting in higher production efficiency. Each microstructure 132 is a microlens. The polarizing element 130 can be manufactured using injection molding, 3D printing, or cutting. The material of the polarizing element 130 can be, but is not limited to, polymethyl methacrylate (PMMA), polycarbonate (PC), or silicone. When the polarizing element 130 is made of PMMA or PC, it exhibits good impact resistance and optical performance, making it suitable for automotive applications.

[0059] The main body 131 of the component has a plate-like structure with a relatively large thickness; alternatively, the main body 131 of the component may have a sheet-like structure with a relatively small thickness. The arrangement of the multiple microstructures 132 depends on the shape of the display panel 120. A square array of microstructures 132 is used to adapt to a square display panel 120. When the display panel 120 is circular, the multiple microstructures 132 are arranged in a circular array.

[0060] The head-up display system 100 also includes a diffuser element 140, which is disposed between the display panel 120 and the polarizing element 130, and parallel to the display panel 120. The diffuser element 140, in conjunction with the polarizing element 130 and the lens 115 of the LED light source 112, can better eliminate bright spots in the light source when the driver views the display panel 120, avoiding glare and improving display quality. Specifically, the diffuser element 140 can be a diffuser sheet or diffuser plate, serving to diffuse light to a certain extent, but without significantly affecting the brightness of the display panel 120.

[0061] The display panel 120 is a liquid crystal display panel, and the backlight module 110 provides backlight for it. Further, the display panel 120 can be, but is not limited to, a TFT display panel. The tilted display panel 120 can be configured to be substantially perpendicular to the driver's field of vision. Light rays emitted perpendicularly to the display panel 120, after passing through the display panel 120, can essentially enter the driver's field of vision and be observed, avoiding waste of normal light emission and improving luminous efficiency.

[0062] The tilt angle of the display panel 120 relative to the horizontal plane P can be greater than or equal to the tilt angle θ1 of the first tilted surface 133. The tilt angle θ1 of the first tilted surface 133 and the tilt angle θ2 of the second tilted surface 134 both depend on the tilt angle of the display panel 120 relative to the horizontal plane P. The magnitude of the tilt angles of the display panel 120 and the two tilted surfaces is not specifically limited here. For example, the tilt angle θ1 of the first tilted surface 133 can be 14°, the tilt angle θ2 of the second tilted surface 134 can be 8°, and the tilt angle of the display panel 120 relative to the horizontal plane P can be 14°. Obviously, the above angle values ​​are exemplary and not limiting, and can be adjusted according to actual needs.

[0063] Please see Figure 6 , Figure 6The schematic diagram of the head-up display system in the second embodiment of this application is shown. Compared with the polarizing element 130 of the head-up display system 100 in the first embodiment, the second inclined surface 134 of the polarizing element 130 of the head-up display system 100 in this embodiment is configured to allow the first deflected light ray L1 to be emitted perpendicularly to form the outgoing light ray. That is, the first deflected light ray L1 will not be refracted when it passes through the second inclined surface 134. It passes directly through the second inclined surface 134 and irradiates the display panel 120. The energy loss of the first deflected light ray L1 on the second inclined surface 134 is relatively small, which is beneficial to further improve the brightness of the display panel 120.

[0064] Furthermore, the second inclined surface 134 is configured such that the emitted light rays perpendicularly illuminate the light-incident surface of the display panel 120. After the first deflected light ray L1 is emitted perpendicularly from the second inclined surface 134, the resulting emitted light rays also perpendicularly illuminate the light-incident surface of the display panel 120, meaning that the second inclined surface 134 is parallel to the light-incident surface of the display panel 120. The emitted light rays, deflected by the polarizing element 130, are perpendicularly incident on the display panel 120 and all enter the driver's visual range, resulting in higher luminous efficiency and better product brightness.

[0065] The tilt angle of the display panel 120 relative to the horizontal plane is equal to the tilt angle θ2 of the second tilt surface 134 and less than the tilt angle θ1 of the first tilt surface 133.

[0066] Each LED light source 112 also includes a light-transmitting adhesive layer 117, which is disposed on the top surface of the LED chip 113 to reduce Fresnel loss of the chip and improve light extraction efficiency. Moreover, there is a gap between the light-transmitting adhesive layer 117 and the lens 115, which gives the LED light source 112 multiple optical interfaces and better light control capability.

[0067] As for the other aspects of the head-up display system 100 in this embodiment, they are basically the same as the other aspects of the head-up display system 100 in the first embodiment above. The specific content can be referred to the description of the first embodiment above, and will not be repeated here.

[0068] Please see Figure 7 , Figure 7A schematic diagram of a head-up display system according to a third embodiment of this application is shown. Compared to the LED light source 112 of the head-up display system 100 in the first embodiment, in this embodiment, the lens 115 of each LED light source 112 of the head-up display system 100 is asymmetrically arranged relative to the optical axis of the LED chip 113. This allows the lens to deflect the normal emission of the LED chip 113 towards the polarizing element 130, increasing the number of deflections of the normal emission of the LED chip 113 and increasing the polarization angle of the normal emission, thus adapting to more application scenarios requiring polarized illumination. It should be noted that the normal emission of the LED chip 113 includes light emitted along its optical axis and light emitted parallel to the optical axis.

[0069] Furthermore, each lens 115 has a first portion 118 and a second portion 119, located on opposite sides of the longitudinal axial section. The first portion 118 is close to the first inclined surface 133, and the second portion 119 faces away from the first inclined surface 133. The volume of the first portion 118 is larger than the volume of the second portion 119. It should be noted that the longitudinal axial section is a cross-section perpendicular to the transverse axial section, and the transverse axial section also passes through the optical axis. Figure 7 The cross-section shown is the result of cutting it.

[0070] Each LED light source 112 also includes a light-transmitting adhesive layer 117, which is disposed on the top surface of the LED chip 113 to reduce Fresnel loss and improve light extraction efficiency. Furthermore, there is a gap between the light-transmitting adhesive layer 117 and the lens 115, giving the LED light source 112 multiple optical interfaces and better light control. Specifically, the light-transmitting adhesive layer 117 can be a phosphor layer, capable of converting the blue light emitted by the LED chip 113 into white light.

[0071] As for the other aspects of the head-up display system 100 in this embodiment, they are basically the same as the other aspects of the head-up display system 100 in the first embodiment above. The specific content can be referred to the description of the first embodiment above, and will not be repeated here.

[0072] Please see Figure 8 and Figure 9 , Figure 8 A schematic diagram of the head-up display system according to the fourth embodiment of this application is shown. Figure 9 It shows Figure 8 The schematic diagram of the polarizing element of the head-up display system shows that, compared with the polarizing element 130 of the head-up display system 100 in the second embodiment, the second horizontal surface 142 of the polarizing element 130 in this embodiment is horizontally arranged, and is used to further deflect the first deflected light L1 to the same side to form the second deflected light L2.

[0073] By setting an inclined first inclined surface 133 and a horizontal second horizontal surface 142, the first inclined surface 133 can deflect the normal light rays perpendicular to the horizontal plane P to form a first deflected ray L1. The second horizontal surface 142 can further deflect the first deflected ray L1 to the same side to form a second deflected ray L2, thereby realizing the deflection of the normal light rays, that is, realizing the polarized illumination of optical axis emission, which can meet the application scenarios of optical axis emission polarized illumination. Moreover, compared with the inclined second inclined surface 134, the horizontal second horizontal surface 142 has a larger refraction angle for the first deflected ray L1, which can further increase the final deflection angle of the normal light rays.

[0074] The second horizontal surface 142 is configured such that the second deflected ray L2 perpendicularly illuminates the light-incident surface of the display panel 120. That is, the preset direction of the second deflected ray L2 is perpendicular to the display panel 120. All second deflected rays L2 can enter the driver's visual range, resulting in higher luminous efficiency and better product brightness. The tilt angle of the display panel 120 relative to the horizontal plane P is greater than the tilt angle of the display panel 120 in the first to third embodiments described above.

[0075] A top view of the polarizing element 130 can present the following: Figure 5 The effect shown is that, because the second horizontal surface 142 is horizontal, the top view of the multiple microstructures 132 is their orthographic projection onto the second horizontal surface 142. For the specific arrangement of the microstructures 132 and their technical effects, please refer to the corresponding content in the first embodiment described above. Additionally, some sides of the component body 131 are not of a regular shape.

[0076] As for the other aspects of the head-up display system 100 in this embodiment, they are basically the same as the other aspects of the head-up display system 100 in the second embodiment above. The specific content can be referred to the description of the second embodiment above, and will not be repeated here.

[0077] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0078] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A head-up display system, characterized in that, include: A backlight module (110) includes a substrate (111) and a plurality of LED light sources (112). The plurality of LED light sources (112) are spaced apart on the substrate (111). Each LED light source (112) is an integrated lens light source and includes an LED chip (113). Display panel (120), the display panel (120) being tilted relative to the backlight module (110); and A polarizing element (130) is disposed between the backlight module (110) and the display panel (120) to deflect the normal light emitted by the LED light source (112) or to refract the normal light emitted by the LED chip (113) after being deflected, thereby forming outgoing light that shines on the display panel (120) in a preset direction.

2. The head-up display system according to claim 1, characterized in that, Each of the LED light sources (112) further includes a bracket (114) and a lens (115). The bracket (114) is disposed on the substrate (111), and the lens (115) is disposed on the bracket (114) to form a light source cavity (116). The LED chip (113) is disposed in the bracket (114), located in the light source cavity (116), and spaced apart from the lens (115).

3. The head-up display system according to claim 2, characterized in that, In each of the LED light sources (112), the lens (115) is asymmetrically arranged relative to the optical axis of the LED chip (113) and is used to deflect the normal emission of the LED chip (113) toward the polarizing element (130).

4. The head-up display system according to claim 1, characterized in that, The polarizing element (130) is configured such that the preset direction of the emitted light is perpendicular to the display panel (120).

5. The head-up display system according to any one of claims 1 to 4, characterized in that, The polarizing element (130) includes an element body (131) and a plurality of microstructures (132). The element body (131) has a first inclined surface (133), a second inclined surface (134), and a side surface (135). The first inclined surface (133) and the second inclined surface (134) are inclined relative to the horizontal plane (P). The side surface (135) is connected between the first inclined surface (133) and the second inclined surface (134). The plurality of microstructures (132) are disposed on the second inclined surface (134). The first inclined surface (133) is used to refract the normal light emitted by the LED light source (112) or refract the normal light emitted by the LED chip (113) after being deflected, to form a first deflected light ray (L1); the second inclined surface (134) is used to allow the first deflected light ray (L1) to be emitted perpendicularly to form the outgoing light ray, or to further refract the first deflected light ray (L1) to the same side to form a second deflected light ray (L2), the second deflected light ray (L2) being the outgoing light ray.

6. The head-up display system according to claim 5, characterized in that, Relative to the horizontal plane (P), the tilt angle θ1 of the first inclined surface (133) is greater than the tilt angle θ2 of the second inclined surface (134).

7. The head-up display system according to claim 5, characterized in that, The first inclined surface (133) and the second inclined surface (134) extend and intersect in the same direction, and the extension directions of the first inclined surface (133) and the second inclined surface (134) are opposite to the direction of their refracted light.

8. The head-up display system according to claim 5, characterized in that, The side surface (135) includes two opposing trapezoidal surfaces (136) and two opposing square surfaces. The trapezoidal surfaces (136) are connected to the square surfaces. The trapezoidal surfaces (136) have acute and obtuse base angles. The acute base angle is formed by the first inclined surface (133) and the base edge, and the obtuse base angle is formed by the second inclined surface (134) and the base edge.

9. The head-up display system according to claim 5, characterized in that, The plurality of microstructures (132) are arranged in an array, adjacent microstructures (132) are connected, and the orthographic projection (137) of each microstructure (132) on the second inclined surface (134) is a parallelogram.

10. The head-up display system according to any one of claims 1 to 4, characterized in that, The polarizing element (130) includes an element body (131) and a plurality of microstructures (132). The element body (131) has a first inclined surface (133) and a second horizontal surface (142). The first inclined surface (133) is inclined relative to the horizontal plane (P). The plurality of microstructures (132) are disposed on the second horizontal surface (142). The first inclined surface (133) is used to refract the normal light emitted by the LED light source (112) or to refract the normal light emitted by the LED chip (113) after being deflected, thereby forming a first deflected light ray (L1); the second horizontal surface (142) is used to further refract the first deflected light ray (L1) towards the same side to form a second deflected light ray (L2), and the second deflected light ray (L2) is the outgoing light ray.

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