Backlight system, vehicle head-up display and vehicle

Abstract

Embodiments of the present invention relate to the field of head-up display technology, and in particular to a backlight system, a vehicle-mounted head-up display, and a vehicle. The present invention provides a backlight system, a vehicle-mounted head-up display, and a vehicle, comprising an illumination unit, an optical path shaping component, a diffusion unit, and a display unit arranged in sequence, wherein the illumination unit is used to generate illumination light, the optical path shaping component is used to adjust the longitudinal angle and the transverse angle of the illumination light; the diffusion unit is used to uniformly diffuse the illumination light; and the display unit is used to receive the illumination light and display an image. The backlight system adjusts the transverse angle and the longitudinal angle of the illumination light through the optical path shaping component, thereby adjusting the transverse beam size and the longitudinal beam size of the illumination light, and finally forms a transverse and longitudinal efficient and uniform beam through the action of the diffusion unit, and irradiates the display unit, thereby ensuring high light utilization and uniform display.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of head-up display, and in particular to a backlight system, a vehicle-mounted head-up display and a vehicle. Background Art

[0002] The vehicle head-up display is a projection optical system based on a pattern generator. Due to cost considerations, the pattern generators currently selected by head-up display manufacturers are often mainly thin film transistor liquid crystal displays (TFT-LCD).

[0003] Since the head-up display requires a higher brightness and the transmittance of TFT-LCD is lower, the direct-type backlight with higher light utilization efficiency is the mainstream of the current head-up display backlight design. However, there are often various defects in the current direct-type backlight system, such as light and dark stripes, Fresnel patterns, etc., which lead to uneven display and affect the user experience. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a backlight system, a vehicle-mounted head-up display and a vehicle, which have high light utilization efficiency and uniform display.

[0005] In a first aspect, a technical solution adopted in an embodiment of the present invention is to provide a backlight system, comprising:

[0006] A lighting unit, used for providing lighting light;

[0007] A light path shaping component, provided on the light-emitting side of the lighting unit, for adjusting the longitudinal angle and the transverse angle of the lighting light;

[0008] A diffusion unit, disposed on the light-emitting side of the light path shaping component, for uniformly diffusing the illumination light;

[0009] The display unit is arranged on the light-emitting side of the diffusion unit and is used for receiving the illumination light and displaying an image.

[0010] In some embodiments, the optical path shaping assembly includes a shaping lens and a reflection cavity arranged in sequence;

[0011] The light incident side of the shaping lens is arranged on the light emitting side of the lighting unit, and the diffusion unit is arranged on the light emitting side of the reflection cavity. The shaping lens is used to converge the lateral angle of the illumination light and diffuse the longitudinal angle of the illumination light, and the reflection cavity is used to converge the longitudinal angle of the illumination light.

[0012] In some embodiments, the shaping lens is a cylindrical lens;

[0013] The cylindrical lens has an incident surface and an exit surface. The incident surface of the cylindrical lens is arranged adjacent to the lighting unit, and the exit surface of the cylindrical lens is arranged adjacent to the reflection cavity. The incident surface of the cylindrical lens is a plane, and the exit surface of the cylindrical lens is a cylinder.

[0014] In some embodiments, the reflective cavity is a curved reflective cavity.

[0015] In some embodiments, the diffusion unit is a profiled diffusion membrane.

[0016] In some embodiments, the lighting unit is an LED light source.

[0017] In some embodiments, the display unit is a TFT-LCD.

[0018] In a second aspect, an embodiment of the present invention further provides a vehicle-mounted head-up display, comprising:

[0019] windshield;

[0020] And, a backlight system as described in any one of the first aspects;

[0021] The windshield is arranged on the light-emitting side of the display unit, and the windshield is used to reflect the image to human eyes.

[0022] In a third aspect, an embodiment of the present invention further provides a vehicle, comprising the vehicle-mounted head-up display as described in the second aspect.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: Different from the prior art, the present invention provides a backlight system, a vehicle-mounted head-up display and a vehicle, comprising an illumination unit, an optical path shaping component, a diffusion unit and a display unit arranged in sequence, wherein the illumination unit is used to generate illumination light, the optical path shaping component is used to adjust the longitudinal angle and the transverse angle of the illumination light; the diffusion unit is used to uniformly diffuse the illumination light; the display unit is used to receive the illumination light and display an image. The backlight system adjusts the transverse angle and the longitudinal angle of the illumination light through the optical path shaping component, thereby adjusting the transverse beam size and the longitudinal beam size of the illumination light, and finally forms a transverse and longitudinal efficient and uniform beam through the action of the diffusion unit, and irradiates the display unit, thereby ensuring high light utilization and uniform display. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements / modules and steps with the same reference numerals in the drawings are represented as similar elements / modules and steps. Unless otherwise specified, the figures in the drawings do not constitute proportional limitations.

[0025] Figure 1 is a schematic diagram of a structural block diagram of a backlight system provided by an embodiment of the present invention;

[0026] Figure 2 is a structural schematic diagram of a backlight system provided by an embodiment of the present invention;

[0027] Figure 3 yes Figure 2 Schematic diagram of the transverse optical path when the shaping lens is a cylindrical lens;

[0028] Figure 4 yes Figure 2 Schematic diagram of the longitudinal optical path when the shaping lens is a cylindrical lens;

[0029] Figure 5 is a schematic longitudinal section diagram of a curved reflective cavity provided by an embodiment of the present invention;

[0030] Figure 6 yes Figure 2 Schematic diagram of the longitudinal light path when the middle reflection cavity is a curved reflection cavity;

[0031] Figure 7 yes Figure 2 A schematic diagram of a light path in . DETAILED DESCRIPTION

[0032] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0033] For ease of understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those generally understood by those skilled in the art of the present application. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not used to limit the present application. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0034] It should be noted that, if there is no conflict, the various features in the embodiments of the present invention can be combined with each other, and all are within the scope of protection of this application. In addition, although the functional module division is performed in the device schematic, in some cases, the module division can be different from that in the device. In addition, the words "first", "second", etc. used in this article do not limit the data and execution order, but only distinguish the same items or similar items with basically the same functions and effects.

[0035] Currently, two structures are commonly used in the direct-type backlight system of TFT-LCD. The first structure uses a trapezoidal cavity and a Fresnel mirror to shape the LED light source, and then diffuses the shaped light evenly, but this will cause Fresnel fringes. The second structure uses a TIR prism and a compound eye lens to shape the light path, and then diffuses the shaped light evenly, but this will produce light and dark stripes. Therefore, in the direct-type backlight system using TFT-LCD, how to ensure high light utilization and uniform display is an urgent problem to be solved.

[0036] In order to solve the above-mentioned problems, the embodiments of the present invention provide a backlight system, a vehicle-mounted head-up display and a vehicle, which can not only ensure high light utilization but also uniform display.

[0037] In a first aspect, an embodiment of the present invention provides a backlight system, see Figure 1 The backlight system 10 includes an illumination unit 1, a light path shaping component 2, a diffusion unit 3 and a display unit 4, which are arranged in sequence. The illumination unit 1 is used to provide illumination light. The light path shaping component 2 is arranged on the light exit side of the illumination unit 1, and the light path shaping component 2 is used to adjust the longitudinal angle and the transverse angle of the illumination light. The diffusion unit 3 is arranged on the light exit side of the light path shaping component 2, and the diffusion unit 3 is used to uniformly diffuse the illumination light. The display unit 4 is arranged on the light exit side of the diffusion unit 3, and the display unit 4 is used to receive the illumination light and display an image.

[0038] In the backlight system, after the illumination light emitted by the illumination unit 1 passes through the light path shaping component 2, the longitudinal angle and the transverse angle of the illumination light change, that is, the longitudinal beam size and the transverse beam size change, and after being diffused by the diffusion unit 3, it is irradiated on the display unit 4, and the display unit 4 displays the image. In the backlight system, the longitudinal angle and the transverse angle of the illumination light are adjusted respectively by the light path shaping component 2, and then a transverse and longitudinal efficient and uniform light beam is formed through the diffusion unit 3, thereby ensuring high light utilization and uniform display.

[0039] Specifically, in some embodiments, the lighting unit is an LED light source. In practical applications, the lighting unit may also be other light sources with a smaller light emitting area, and there is no need to stick to the limitations in this embodiment.

[0040] In some embodiments, the display unit is a TFT-LCD. In practical applications, the display unit can also be any other suitable backlight display unit that needs to receive illumination light to display an image, and there is no need to stick to the limitations in this embodiment.

[0041] In some of these examples, see Figure 2The optical path shaping component 2 includes a shaping lens 21 and a reflection cavity 22 which are sequentially arranged. The light incident side of the shaping lens 21 is arranged at the light exit side of the illumination unit 1, and the diffusion unit 3 is arranged at the light exit side of the reflection cavity 22. The shaping lens 21 is used to converge the lateral angle of the illumination light and diffuse the longitudinal angle of the illumination light, and the reflection cavity 22 is used to converge the longitudinal angle of the illumination light.

[0042] In some embodiments, the shaping lens is a cylindrical lens. Figure 3 The cylindrical lens 21 includes an incident surface 211 and an exit surface 212, wherein the incident surface 211 of the cylindrical lens 21 is arranged close to the light exiting side of the lighting unit 1, and the exit surface of the cylindrical lens is arranged close to the light incident side of the reflection cavity, and the incident surface 211 of the cylindrical lens 21 is a plane, and the exit surface 212 of the cylindrical lens 21 is a cylindrical surface. Please continue to refer to Figure 3 After the illumination light emitted by the illumination unit 1 passes through the cylindrical lens 21, the lateral angle of the light will converge once, that is, the illumination light will converge in the lateral direction, and, please refer to Figure 4 After the illumination light passes through the cylindrical lens 21, the light will be refracted once in the longitudinal direction, and the longitudinal angle of the illumination light will be diffused. In practical applications, the lateral light utilization rate of the illumination light can be effectively adjusted by adjusting the distance between the illumination unit 1 and the cylindrical lens 21, the cylindrical curvature of the cylindrical lens 21, and the thickness of the cylindrical lens 21.

[0043] In some embodiments, the reflection cavity is a curved reflection cavity, that is, the reflection surface of the reflection cavity is a curved surface. Figure 5 The curved reflective cavity is cup-shaped and has a light inlet 221, a first light outlet 222, a second light outlet 223, a first reflective surface 224 and a second reflective surface 225. Figure 2 and Figure 5 The light inlet of the curved reflective cavity is arranged adjacent to the shaping lens, and the first light outlet and the second light outlet of the curved reflective cavity are arranged adjacent to the diffusion unit. In addition, the first reflecting surface 224 is a first parabolic surface, and the second reflecting surface 225 is a second parabolic surface. The first parabolic surface can be the same as the second parabolic surface or different. Figure 6After the illumination light passes through the curved reflective cavity 22, the illumination light converges once in the longitudinal direction under the action of the curved reflective cavity, that is, the longitudinal angle of the illumination light converges at this time. At this time, the size of the light beam can be adjusted by adjusting the length of the curved reflective cavity to meet the needs of different display area sizes. In addition, the angle of the light beam can be adjusted by adjusting the surface equations of the first reflective surface and the second reflective surface. In practical applications, the number of light outlets can be set according to actual needs, and the first reflective surface and the second reflective surface can also be other curved surfaces, and there is no need to stick to the limitations in this embodiment.

[0044] In some embodiments, the diffusion unit is a profiled diffusion film, which has different diffusion effects on the transverse light beam and the longitudinal light beam. In practical applications, a diffusion film with the same diffusion effect on the transverse light beam and the longitudinal light beam can also be used, which is not limited here.

[0045] Below Figure 2 The embodiment shown in the figure elaborates the light path of the backlight system provided by the present invention, wherein the lighting unit 1 is an LED light source, the shaping lens 21 is a cylindrical lens, the reflection cavity 22 is a parabolic reflection cavity, the diffusion unit 3 is a special-shaped diffusion film, and the display unit 4 is a TFT-LCD.

[0046] Please refer to Figure 2 and Figure 7 In this backlight system, the illumination light emitted by the LED light source passes through the cylindrical lens 21, the parabolic reflection cavity 22, and the profiled diffusion film 3 in sequence, forming a uniform light beam with high light utilization rate to illuminate the TFT-LCD. First, after the illumination light generated by the LED light source 1 passes through the cylindrical lens 21, the light converges once in the horizontal direction and refracts once in the vertical direction. Then, under the action of the curved reflection cavity 22, the illumination light converges once in the vertical direction. Finally, under the action of the profiled diffusion film 3, a uniform light beam is formed.

[0047] In the backlight system, firstly, the size of the lateral beam of the illumination light can be adjusted by the cylindrical lens 21, and a lateral beam with high light utilization and uniform illumination brightness can be formed after being diffused by the profiled diffusion film 3; in addition, the size of the longitudinal beam of the illumination light can be adjusted by the surface equation of the reflection surface of the curved reflection cavity 22, and a longitudinal beam with high light utilization and uniform illumination brightness can be formed after being diffused by the profiled diffusion film 3. Through the combined effect of the above two methods, the backlight system can make the illumination light finally irradiated on the TFT-LCD have high utilization and uniform display; in addition, in the backlight system, trapezoidal reflection cavity, Fresnel mirror, TIR prism and compound eye lens are not used, so that the final image presented has no display defects such as Fresnel fringes and light and dark fringes.

[0048] In a second aspect, an embodiment of the present invention provides a vehicle-mounted head-up display, which includes: a windshield; and a backlight system as described in any one of the first aspects above; wherein the windshield is arranged on the light-emitting side of the display unit, and the windshield is used to reflect the image to the human eye. In the vehicle-mounted head-up display, after the illumination light emitted by the illumination unit passes through the optical path shaping component, the longitudinal angle and the transverse angle of the illumination light change, that is, the longitudinal beam size and the transverse beam size change, and after being diffused by the diffusion unit, it is irradiated on the display unit, the display unit displays the image, and the windshield reflects the image to the human eye. In the vehicle-mounted head-up display, the longitudinal angle and the transverse angle of the illumination light are adjusted respectively by the optical path shaping component, and then a transverse and longitudinal efficient and uniform light beam is formed through the diffusion unit, thereby ensuring high light utilization and uniform display.

[0049] In a third aspect, an embodiment of the present invention provides a vehicle, which includes a vehicle-mounted head-up display as described in the second aspect. In the vehicle, after the illumination light emitted by the illumination unit passes through the optical path shaping component, the longitudinal angle and the transverse angle of the illumination light change, that is, the longitudinal light beam size and the transverse light beam size change, and after being diffused by the diffusion unit, it is irradiated on the display unit, and the display unit displays an image. In the vehicle, the longitudinal angle and the transverse angle of the illumination light are adjusted respectively by the optical path shaping component, and then a transverse and longitudinal efficient and uniform light beam is formed through the diffusion unit, thereby ensuring high light utilization and uniform display.

[0050] The present invention provides a backlight system, a vehicle-mounted head-up display and a vehicle, comprising an illumination unit, an optical path shaping component, a diffusion unit and a display unit arranged in sequence, wherein the illumination unit is used to generate illumination light, the optical path shaping component is used to adjust the longitudinal angle and the transverse angle of the illumination light; the diffusion unit is used to uniformly diffuse the illumination light; and the display unit is used to receive the illumination light and display an image. The backlight system adjusts the transverse angle and the longitudinal angle of the illumination light through the optical path shaping component, thereby adjusting the transverse beam size and the longitudinal beam size of the illumination light, and finally forms a transverse and longitudinal efficient and uniform beam through the action of the diffusion unit, and irradiates the display unit, thereby ensuring high light utilization and uniform display.

[0051] It should be noted that the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may also be combined, the steps may be implemented in any order, and there are many other changes in different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A backlight system, characterized in that: include: A lighting unit, used for providing lighting light; A light path shaping component, the light path shaping component comprises a shaping lens and a reflection cavity which are arranged in sequence, the light incident side of the shaping lens is arranged at the light exit side of the lighting unit, the shaping lens is a cylindrical lens, the cylindrical lens has an incident surface and an exit surface, the incident surface of the cylindrical lens is arranged adjacent to the lighting unit, the exit surface of the cylindrical lens is arranged adjacent to the reflection cavity, the incident surface of the cylindrical lens is a plane, the exit surface of the cylindrical lens is a cylinder, the shaping lens is used to converge the lateral angle of the illumination light, and the reflection cavity is used to converge the longitudinal angle of the illumination light; A diffusion unit, disposed on the light-emitting side of the reflection cavity, for uniformly diffusing the illumination light; A display unit, disposed on the light-emitting side of the diffusion unit, for receiving the illumination light and displaying an image; The lighting unit, the shaping lens and the reflecting cavity are sequentially arranged along a first optical axis, the first light outlet of the reflecting cavity, the diffusion unit and the display unit are sequentially arranged along a second optical axis, and the first optical axis is not parallel to the second optical axis.

2. The backlight system according to claim 1, characterized in that: The reflection cavity is a curved reflection cavity.

3. The backlight system according to claim 1, characterized in that: The diffusion unit is a special-shaped diffusion membrane.

4. The backlight system according to any one of claims 1 to 3, characterized in that: The lighting unit is an LED light source.

5. The backlight system according to any one of claims 1 to 3, characterized in that: The display unit is a TFT-LCD.

6. A vehicle-mounted head-up display, characterized in that: include: windshield; And, the backlight system as described in any one of claims 1 to 5; The windshield is arranged on the light-emitting side of the display unit, and is used to reflect the image to human eyes.

7. A vehicle, characterized in that: Comprising the vehicle-mounted head-up display as claimed in claim 6.

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