Backlight illumination system of head-up display

Abstract

The utility model discloses a backlight illumination system of a head-up display, and aims to solve the problems that the existing HUD backlight system has more optical elements, needs more time to design and has a long development period, and meanwhile, the more optical elements mean high cost, the price of the HUD is increased, and the HUD is not favorably popularized in the market. The illumination system comprises a backlight source, a lens and an LCD screen, the backlight source and the LCD screen are located on the left side and the right side of the lens respectively, the backlight source is used for providing energy and outputting illumination light, the lens is used for being responsible for light distribution and dodging, and the LCD screen is used for providing an image source needed by an imaging module. According to the utility model, through arranging the collimation surface and the light homogenizing surface at the left side and the right side of the lens, only one optical element is needed, the uniformity and the light efficiency required by backlight illumination are realized, the design time is greatly shortened, the assembly difficulty between the optical elements is reduced, the cost is effectively reduced, and convenience is provided for the popularization of the HUD.

Description

Technical Field

[0001] The utility model belongs to the technical field of head-up displays, and in particular relates to a head-up display backlighting system. Background Art

[0002] The optical module of the HUD in the car head-up display system is composed of an imaging module and a backlight module. The imaging module projects the image source to the front of the windshield to produce a virtual image. The virtual image can display information related to the car's driving status, such as the speed and rotation speed. The driver can understand the status of the car by looking straight ahead at the virtual image, avoiding the potential danger of looking down at the dashboard. The backlight module is responsible for illuminating the image source (the image source is generally displayed by a liquid crystal screen (TFT-LCD)). In order to ensure the viewing comfort of the driver, it is necessary to ensure the uniformity of energy distribution on the image source surface.

[0003] The existing HUD backlight system has more optical components, which requires more time to design and has a long development cycle. It will also increase the complexity of assembly, resulting in a large deviation between the design effect and the actual effect. At the same time, more optical components mean high costs, which increases the price of HUD and is not conducive to the popularization of HUD in the market. Utility Model Content

[0004] (1) Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a head-up display backlighting system, which aims to solve the problems that the existing HUD backlighting system has more optical elements, requires more time to design, has a long development cycle, and will increase the complexity of assembly, resulting in a large deviation between the design effect and the actual effect. At the same time, more optical elements means high cost, which increases the price of HUD and is not conducive to the popularization of HUD in the market.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the utility model provides such a head-up display backlight illumination system, which includes a backlight source, a lens and an LCD screen, wherein the backlight source and the LCD screen are respectively located on the left and right sides of the lens, the backlight source is used to provide energy and output illumination light, the lens is used to be responsible for light distribution and uniform light, and the LCD screen is used to provide an image source required by an imaging module;

[0008] A collimating surface is arranged on the left side of the lens, and the collimating surface is used to collect and collimate the large-angle light emitted by the backlight source. A uniform light surface is arranged on the right side of the lens, and the uniform light surface is used to diverge or converge the light according to predetermined requirements.

[0009] Preferably, the collimating surface is composed of a plurality of collimating convex lenses, and the light homogenizing surface is composed of a light homogenizing concave lens.

[0010] Furthermore, a groove is provided on the left side of the collimating surface, and the backlight source is installed inside the groove.

[0011] Furthermore, the bottom width of the light-homogenizing surface is greater than the top width.

[0012] Furthermore, a plurality of array lenses consisting of convex micro lenses are installed on the inner wall of the light-homogenizing surface, and the array lenses are used to redistribute the energy of light to ensure uniform illumination on the LCD screen.

[0013] Furthermore, the backlight source is a light emitting diode, and the number of the light emitting diodes is equal to the number of the collimating convex lenses.

[0014] Beneficial Effects

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model only needs one optical element to achieve the uniformity and light efficiency required for backlighting by setting the collimating surface and the light-homogenizing surface on the left and right sides of the lens, which greatly shortens the design time and reduces the difficulty of assembling the optical components, thus facilitating the popularization of HUD.

[0017] The utility model discloses a backlighting system with a uniform light surface that has both diverging and converging functions. Compared with a solution that uses two optical elements to achieve these two functions, the utility model can effectively reduce costs and reduce the optical area. At the same time, the light propagation loss caused by a single optical element is also low, thereby improving the utilization rate of light energy and reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the backlighting system of the utility model.

[0019] Figure 2 It is a structural schematic diagram of a lens of a backlight illumination system of the utility model.

[0020] Figure 3 It is a structural schematic diagram of the backlighting system of the utility model.

[0021] Figure 4 It is a structural schematic diagram of an existing backlighting system.

[0022] The markings in the attached figure are: 1. backlight source; 2. lens; 3. LCD screen; 4. collimating surface; 5. uniform light surface; 6. groove; 7. array lens. DETAILED DESCRIPTION

[0023] This specific implementation is a head-up display backlighting system, and its structural schematic diagram is as follows: Figure 1-Figure 3 As shown, the lighting system includes a backlight source 1, a lens 2 and an LCD screen 3. The backlight source 1 and the LCD screen 3 are respectively located on the left and right sides of the lens 2. The backlight source 1 is used to provide energy and output illumination light, the lens 2 is responsible for light distribution and uniform light, and the LCD screen 3 is used to provide the image source required by the imaging module;

[0024] A collimating surface 4 is provided on the left side of the lens 2, and the collimating surface 4 is used to collect and collimate the large-angle light emitted by the backlight source 1. A uniform light surface 5 is provided on the right side of the lens 2, and the uniform light surface 5 is used to diverge or converge the light according to predetermined requirements.

[0025] like Figure 1 and Figure 2 As shown: In this embodiment, the collimating surface 4 is composed of a plurality of collimating convex lenses, and the uniform light surface 5 is composed of a uniform light concave lens.

[0026] When used in this configuration, the light emitted by the backlight source 1 will first pass through the collimating surface 4 on the left side of the lens 2. The collimating surface 4 will gather and collimate the large-angle light emitted by the light source, thereby facilitating better control of the light. When the light collimated by the collimating surface 4 reaches the light distribution and even-lighting surface 5, the curved surface of the even-lighting surface 5 will diverge or converge the collimated light according to predetermined requirements.

[0027] like Figure 2 and Figure 3 As shown: in this embodiment, a groove 6 is opened on the left side of the collimating surface 4, and the backlight source 1 is installed inside the groove 6.

[0028] In this way, the collimating surface 4 composed of a plurality of collimating convex lenses and the light homogenizing surface 5 composed of light homogenizing concave lenses can be connected together by bonding or other means, and the backlight source 1 can be embedded in the groove 6. The specific installation method is not limited.

[0029] like Figure 1 and Figure 3 As shown: In this embodiment, the bottom width of the light-homogenizing surface 5 is greater than the top width.

[0030] The light-homogenizing surface 5 is configured in this way to have both the functions of divergence and convergence. Compared with the solution of using two optical elements to achieve these two functions, it can effectively reduce the cost, reduce the optical area, and improve the utilization rate of light energy.

[0031] like Figure 1 and Figure 2 As shown: In this embodiment, a plurality of array lenses 7 composed of convex micro lenses are installed on the inner wall of the light-homogenizing surface 5. The array lens 7 is used to redistribute the energy of light to ensure uniform illumination on the LCD screen 3.

[0032] The curved light-distributing surface 5 thus configured will diverge or converge the collimated light according to predetermined requirements. Since the light-distributing light-distributing surface 5 is an array lens 7 composed of a plurality of convex microlenses, the array lens 7 will redistribute the energy of the light to ensure uniform illumination on the LCD screen 3.

[0033] In this embodiment, the backlight source 1 is a light emitting diode, and the number of the light emitting diodes is equal to the number of the collimating convex lenses.

[0034] In this way, the backlight source 1 can be an organic light emitting diode OLED and an inorganic light emitting diode LED, etc., and the type and quantity of the backlight source 1 can be selected according to actual needs;

[0035] The number of light emitting diodes can be set according to the brightness requirement and color requirement of the imaging, etc. In other embodiments, the backlight source 1 can also be other illumination light sources, such as cold cathode fluorescent lamps and laser diodes.

[0036] Working principle: The uniform light surface 5 of the head-up display backlight system has both divergence and convergence functions. Compared with the solution of using two optical elements to achieve these two functions, it can effectively reduce costs and reduce optical area. At the same time, the light propagation loss caused by a single optical element is also low, which improves the utilization rate of light energy and reduces power consumption. When in use, the light emitted by the backlight source 1 will first pass through the collimating surface 4 on the left side of the lens 2. The collimating surface 4 will gather and collimate the large-angle light emitted by the light source, so as to facilitate better control of the light. When the light collimated by the collimating surface 4 reaches the uniform light distribution surface 5, the curved uniform light distribution surface 5 will diverge or converge the collimated light according to predetermined requirements. Since the uniform light distribution surface 5 is an array lens 7 composed of multiple convex microlenses, the array lens 7 will redistribute the energy of the light at this time to ensure uniform illumination on the LCD screen 3 and improve driving comfort.

[0037] All technical features in this embodiment can be freely combined according to actual needs.

[0038] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

Claims

1. A head-up display backlighting system, characterized in that: The lighting system includes: A backlight source (1), a lens (2) and an LCD screen (3), wherein the backlight source (1) and the LCD screen (3) are respectively located on the left and right sides of the lens (2), the backlight source (1) is used to provide energy and output illumination light, the lens (2) is used to distribute and even the light, and the LCD screen (3) is used to provide an image source required by the imaging module; A collimating surface (4) is arranged on the left side of the lens (2), and the collimating surface (4) is used to collect and collimate the large-angle light emitted by the backlight source (1); a light-uniform surface (5) is arranged on the right side of the lens (2), and the light-uniform surface (5) is used to diverge or converge the light according to predetermined requirements.

2. The head-up display backlighting system according to claim 1, characterized in that: The collimating surface (4) is composed of a plurality of collimating convex lenses, and the light-homogenizing surface (5) is composed of a light-homogenizing concave lens.

3. The head-up display backlighting system according to claim 2, characterized in that: A groove (6) is provided on the left side of the collimating surface (4), and the backlight source (1) is installed inside the groove (6).

4. The head-up display backlighting system according to claim 3, characterized in that: The width of the bottom of the light-homogenizing surface (5) is greater than the width of the top.

5. The head-up display backlighting system according to claim 4, characterized in that: The inner wall of the light-homogenizing surface (5) is provided with a plurality of array lenses (7) composed of convex micro lenses, and the array lenses (7) are used to redistribute the energy of light to ensure uniform illumination on the LCD screen (3).

6. The head-up display backlighting system according to claim 2, characterized in that: The backlight source (1) is a light emitting diode, and the number of the light emitting diodes is equal to the number of the collimating convex lenses.

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