PGU backlight system of vehicle-mounted HUD

Abstract

The invention discloses a PGU backlight system of a vehicle-mounted HUD. The PGU backlight system comprises a shell, a PCB is arranged at the bottom of the shell, an LED lamp is connected to the PCB, a Fresnel cylindrical mirror is arranged at an opening of the shell, a free-form surface lens array is arranged in the shell and located above an LED, and a diffusion film is arranged on the face, facing the LED, of the Fresnel cylindrical mirror; a transverse rod used for cleaning the inner wall of the Fresnel cylindrical mirror and an arc-shaped rod used for cleaning the outer wall of the free-form surface lens array are connected into the shell in a sliding mode, and a tensioning mechanism is arranged between the transverse rod and the arc-shaped rod. The invention provides the PGU backlight system of the vehicle-mounted HUD, which can improve the lighting effect.

Description

Technical Field

[0001] The invention relates to optical elements and systems, and in particular to a PGU backlight system for a vehicle-mounted HUD. Background Art

[0002] HUD is the abbreviation of head-up display, which can display the driving information of the vehicle on the windshield, such as vehicle speed, navigation information, roadside warning information, etc. PGU is an important module in HUD components, and the backlighting of PGU is a key factor in the imaging quality of PGU. At present, TFT PGU, as the mainstream HUD solution, has the advantages of high maturity, but it also has the problems of large light loss, lower edge brightness than the middle, poor uniformity, more stray light, and sunlight backflow; that is to say, the PGU backlight system in the prior art has the problem of poor light efficiency. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing technical defects and provide a PGU backlight system for a vehicle-mounted HUD that can improve the light efficiency.

[0004] The technical solution of the present invention is to provide a PGU backlight system for a vehicle-mounted HUD with the following structure: comprising a shell, a PCB board is provided at the bottom of the shell, an LED lamp is connected to the PCB board, a Fresnel cylindrical mirror is provided at the opening of the shell, a free-form surface lens array is provided in the shell, the free-form surface lens array is located above the LED, and a diffusion film is provided on the side of the Fresnel cylindrical mirror facing the LED; a cross bar for cleaning the inner wall of the Fresnel cylindrical mirror and an arc bar for cleaning the outer wall of the free-form surface lens array are slidably connected in the shell, and a tensioning mechanism is provided between the cross bar and the arc bar.

[0005] As a preferred embodiment of the present invention, the shell has a long strip structure, the number of LEDs is 12, and the 12 LED lights are arranged in a straight line; the number of free-form surface lenses is equal to the number of LED lights, and the free-form surface lenses and the LED lights are arranged in a one-to-one correspondence.

[0006] As a preferred embodiment of the present invention, the free-form surface lens controls the horizontal diffusion angle α of the LED lamp to be between 10-20 degrees, and the free-form surface lens controls the vertical diffusion angle β of the LED lamp to be between 50-90 degrees.

[0007] As an improvement of the present invention, an upper slide rail is provided in the upper area of ​​the inner wall of the shell, and the upper slide rail is slidably connected to the upper slider through a dovetail groove, one end of the cross bar is fixedly connected to the upper slider, and the cross bar is arranged on the upper slider perpendicular to the length direction of the shell; a middle slide rail is provided in the middle area of ​​the inner wall of the shell, and the middle slide rail is slidably connected to an active block through a dovetail groove, and the middle slide rail is provided along the length direction of the shell, and a linear rack is rotatably connected to the active block for meshing and transmitting with the linear rack, and a motor for driving the gear forward and reverse is provided on the active block, the motor is electrically connected to the vehicle, the active block is connected to the upper slider through an upper connecting rod, and the upper slide rail is arranged in parallel with the middle slide rail; a lower slide rail is provided in the lower area of ​​the inner wall of the shell, and the lower slide rail is arranged in parallel with the middle slide rail, and the lower slide rail is slidably connected to the lower slider through a dovetail groove, and the lower slider is connected to the active block through a lower connecting rod, one end of the arc rod is fixedly connected to the lower slider, and the inner concave surface of the arc rod faces the outer convex surface of the free-form surface lens array; the arc rod and the cross bar are in the same plane, and the upper connecting rod and the lower connecting rod are in the same plane.

[0008] As an improvement of the present invention, the cross bar is a linear structure, and the cross bar is made of a rigid material; the arc rod is an arc-shaped structure, and the arc rod is made of a plastic material; a rubber strip for contacting the diffusion membrane is embedded on the side of the cross bar facing the diffusion membrane, and a rubber strip for contacting the free-form surface lens array is embedded on the side of the arc rod facing the free-form surface lens array.

[0009] As an improvement of the present invention, there are three groups of tensioning mechanisms, and the three groups of tensioning mechanisms are spaced apart around the circumferential direction of the arc rod; each group of tensioning mechanisms includes a sleeve, a push rod and a compression spring, one end of the sleeve is rotatably connected to the arc rod through a first intersection, and the other end of the sleeve is provided with a blind hole for accommodating the end of the push rod, and the blind hole is arranged along the length direction of the sleeve. The compression spring is located in the blind hole, one end of the compression spring abuts against the end of the push rod, and the other end abuts against the bottom of the blind hole, and one end of the push rod away from the compression spring is rotatably connected to the cross bar through a second intersection.

[0010] After adopting the above structure, compared with the prior art, the PGU backlight system of a vehicle-mounted HUD of the present invention uses a free-form surface lens array to narrow the large-angle light of the LED, and then homogenizes the light through a diffusion film. Finally, the light passing through the free-form surface lens is shrunk and collimated by a Fresnel cylindrical mirror, and finally the light can be evenly dispersed within a specific angle range, so that the stray light outside the specific angle range is very small, thereby improving the light efficiency within the specific angle range, and also improving the brightness and uniformity; in addition, the movement of the cross bar can clean the diffusion film on the inner wall of the Fresnel cylindrical mirror, and the movement of the arc rod can clean the outer convex surface of the free-form surface lens array, thereby improving the brightness. In summary, the present invention provides a PGU backlight system of a vehicle-mounted HUD that can improve the light efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1It is a schematic diagram of the horizontal direction of the PGU backlight system of the vehicle-mounted HUD of the present invention.

[0012] Figure 2 It is a cross-sectional view of the PGU backlight system of the vehicle-mounted HUD in the present invention in the vertical direction.

[0013] Figure 3 It is a schematic diagram of the structure of the free-form surface lens array in the present invention.

[0014] Figure 4 It is a schematic diagram of the structure of the Fresnel cylindrical mirror in the present invention.

[0015] Figure 5 Schematic diagram of the structure of the diffusion membrane in the present invention.

[0016] Figure 6 It is a schematic diagram of the structure of the cross bar, arc rod and tensioning mechanism in the housing in the present invention.

[0017] Figure 7 It is a schematic diagram of the structure of the shell in the present invention.

[0018] As shown in the figure: 1. Shell, 2. PCB board, 3. LED lamp, 4. Fresnel cylindrical mirror, 5. Free-form lens array, 6. Diffusion film, 7. Cross bar, 8. Arc rod, 9. Upper slide rail, 10. Upper slider, 11. Middle slide rail, 12. Active block, 13. Upper connecting rod, 14. Lower slide rail, 15. Lower slider, 16. Lower connecting rod, 17. Sleeve, 18. Push rod, 19. Compression spring, 20. First intersection point, 21. Second intersection point. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] As shown in the figure, the PGU backlight system of the vehicle-mounted HUD of the present invention includes a shell 1, a PCB board 2 is provided at the bottom of the shell 1, the PCB board 2 is electrically connected to the vehicle electronic control system, an LED lamp 3 is connected to the PCB board 2, a Fresnel cylindrical mirror 4 is provided at the opening of the shell 1, a free-form surface lens array 5 is provided in the shell 1, the free-form surface lens array 5 is located above the LED, and a diffusion film 6 is provided on the side of the Fresnel cylindrical mirror 4 facing the LED, and the diffusion film 6 is a small-angle or tophat diffusion film 6, which has a uniform light effect; in order to accurately control the light and control the emitted light within the required image range, the free-form surface lens array 5 adopts a small-angle diffusion film 6, such as a tophat diffusion film 6, to uniform light without scattering the light; a cross bar 7 for cleaning the inner wall of the Fresnel cylindrical mirror 4 and an arc rod 8 for cleaning the outer wall of the free-form surface lens array 5 are slidably connected in the shell 1, and a tensioning mechanism is provided between the cross bar 7 and the arc rod 8.

[0021] The housing 1 is in a long strip structure, with 12 LEDs, and the 12 LED lamps 3 are arranged in a straight line; regarding LEDs, small size 3.1 inches are arranged in a single row of LEDs, and large size 4 inches and above are arranged in a double row of LEDs; the number of free-form surface lenses is equal to the number of LED lamps 3, and the free-form surface lenses are arranged in a one-to-one correspondence with the LED lamps 3. In addition, by replacing high-power LEDs with multiple low-power LEDs, the cost can be reduced.

[0022] The free-form surface lens controls the horizontal diffusion angle α of the LED lamp 3 to be between 10-20 degrees, and in this embodiment, α is preferably 20 degrees; the free-form surface lens controls the vertical diffusion angle β of the LED lamp 3 to be between 50-90 degrees, and in this embodiment, β is preferably 60 degrees.

[0023] An upper slide rail 9 is provided in the upper area of ​​the inner wall of the shell 1, and the upper slide rail 9 is slidably connected to the upper slider 10 through a dovetail groove. One end of the cross bar 7 is fixedly connected to the upper slider 10, and the cross bar 7 is arranged on the upper slider 10 perpendicular to the length direction of the shell 1; a middle slide rail 11 is provided in the middle area of ​​the inner wall of the shell 1, and the middle slide rail 11 is slidably connected to an active block 12 through a dovetail groove. The middle slide rail 11 is provided with a linear rack along the length direction of the shell 1, and a gear for meshing with the linear rack is rotatably connected to the active block 12. A motor for driving the gear to rotate forward and reverse is provided on the active block 12, and the motor and the vehicle are connected by Electrical connection, the active block 12 is connected to the upper slider 10 through the upper connecting rod 13, and the upper slide rail 9 is arranged in parallel with the middle slide rail 11; the lower area of ​​the inner wall of the shell 1 is provided with a lower slide rail 14, the lower slide rail 14 is arranged in parallel with the middle slide rail 11, the lower slide rail 14 is slidably connected to the lower slider 15 through a dovetail groove, the lower slider 15 is connected to the active block 12 through the lower connecting rod 16, one end of the arc rod 8 is fixedly connected to the lower slider 15, and the inner concave surface of the arc rod 8 faces the outer convex surface of the free-form surface lens array 5; the arc rod 8 and the cross bar 7 are in the same plane, and the upper connecting rod 13 and the lower connecting rod 16 are in the same plane. Among them, the upper slider 10 and the lower slider 15 are both located on the same side of the cross bar 7 and the arc rod 8, that is, Figure 6 As shown, the upper slider 10 is located on the left side of the cross bar 7, and the lower slider 15 is located on the left side of the arc rod 8. The motor can drive the active block 12 to reciprocate in the length direction of the housing 1, and the active block 12 drives the upper slider 10 and the lower slider 15 to move synchronously through the upper connecting rod 13 and the lower connecting rod 16. When the upper slider 10 slides, it will drive the cross bar 7 to move, and when the lower slider 15 moves, it will drive the arc rod 8 to move. Only when the vehicle is ignited and started, the motor will work once, driving the active block 12 to reciprocate once; when the PGU backlight system works normally, the cross bar 7 and the arc rod 8 shrink to the end position of the housing 1 and remain stationary.

[0024] The cross bar 7 is a linear structure, and the cross bar 7 is made of a rigid material. In this embodiment, the cross bar 7 is preferably made of stainless steel, and the cross bar 7 is parallel to the Fresnel cylindrical mirror 4; the arc rod 8 is an arc-shaped structure, and the arc rod 8 is made of a plastic material. In this embodiment, the arc rod 8 is preferably made of plastic and has a certain deformation ability; a rubber strip for contacting the diffusion membrane 6 is embedded on the side of the cross bar 7 facing the diffusion membrane 6, and a rubber strip for contacting the free-form surface lens array 5 is embedded on the side of the arc rod 8 facing the free-form surface lens array 5.

[0025] There are three groups of tensioning mechanisms, which are spaced apart around the circumferential direction of the arc-shaped rod 8, and the sizes of the tensioning mechanisms at different positions are different; each group of tensioning mechanisms includes a sleeve 17, a push rod 18 and a compression spring 19, one end of the sleeve 17 is rotatably connected to the arc-shaped rod 8 through a first intersection 20, and the other end of the sleeve 17 is provided with a blind hole for accommodating the end of the push rod 18, and the blind hole is arranged along the length direction of the sleeve 17, and the compression spring 19 is located in the blind hole, one end of the compression spring 19 abuts against the end of the push rod 18, and the other end abuts against the bottom of the blind hole, and one end of the push rod 18 away from the compression spring 19 is rotatably connected to the cross bar 7 through a second intersection 21. The elastic force of the compression spring 19 pushes each area of ​​the arc rod 8 against the outer convex surface of the free-form surface lens, especially when the arc rod 8 moves to the transition gap area of ​​the adjacent free-form surface lens, the arc rod 8 is subjected to the pressure of the tensioning mechanism and always keeps in contact with the free-form surface lens to ensure that the gap area of ​​the adjacent free-form surface lens is cleaned; that is, the elastic force of the compression spring 19 on the tensioning mechanism can make the different areas of the arc rod 8 in the length direction deform into a shape that matches the outer convex surface of the free-form surface lens, and then clean each outer convex surface area of ​​the free-form surface lens array 5. Because the housing 1 is loose, or dust, fine microorganisms and other impurities enter after long-term use, if impurities adhere to the internal components of the PGU, it will affect the light effect, so the final light effect can be improved by cleaning the cross bar 7 and the arc rod 8.

[0026] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement and improvement made within the claims of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PGU backlight system for a vehicle-mounted HUD, comprising a housing, a PCB board is provided at the bottom of the housing, an LED lamp is connected to the PCB board, and a Fresnel cylindrical mirror is provided at the opening of the housing, characterized in that: A free-form surface lens array is arranged in the shell, and the free-form surface lens array is located above the LED. A diffusion film is arranged on the side of the Fresnel cylindrical mirror facing the LED. A cross bar for cleaning the inner wall of the Fresnel cylindrical mirror and an arc bar for cleaning the outer wall of the free-form surface lens array are slidably connected in the shell, and a tensioning mechanism is arranged between the cross bar and the arc bar.

2. The PGU backlight system for a vehicle-mounted HUD according to claim 1, characterized in that: The shell has a long strip structure, and the number of LEDs is 12, and the 12 LED lights are arranged in a straight line; the number of free-form surface lenses is equal to the number of LED lights, and the free-form surface lenses and the LED lights are arranged one by one.

3. The PGU backlight system for a vehicle-mounted HUD according to claim 1, characterized in that: The free-form surface lens controls the horizontal diffusion angle α of the LED light to be between 10 and 20 degrees, and the free-form surface lens controls the vertical diffusion angle β of the LED light to be between 50 and 90 degrees.

4. The PGU backlight system for a vehicle-mounted HUD according to claim 1, characterized in that: The upper area of ​​the inner wall of the shell is provided with an upper slide rail, the upper slide rail is slidably connected to the upper slider through a dovetail groove, one end of the cross bar is fixedly connected to the upper slide block, and the cross bar is arranged on the upper slide block perpendicular to the length direction of the shell; a middle slide rail is provided in the middle area of ​​the inner wall of the shell, the middle slide rail is slidably connected to an active block through a dovetail groove, the middle slide rail is provided with a linear rack along the length direction of the shell, a gear for meshing and transmitting with the linear rack is rotatably connected to the active block, a motor for driving the gear forward and reverse is provided on the active block, the motor is electrically connected to the vehicle, the active block is connected to the upper slide block through an upper connecting rod, and the upper slide rail is arranged in parallel with the middle slide rail; a lower slide rail is provided in the lower area of ​​the inner wall of the shell, the lower slide rail is arranged in parallel with the middle slide rail, the lower slide rail is slidably connected to the lower slide block through a dovetail groove, the lower slide block is connected to the active block through a lower connecting rod, one end of the arc rod is fixedly connected to the lower slide block, and the inner concave surface of the arc rod faces the outer convex surface of the free-form surface lens array; the arc rod and the cross bar are in the same plane, and the upper connecting rod and the lower connecting rod are in the same plane.

5. The PGU backlight system for vehicle-mounted HUD according to claim 1, characterized in that: The cross bar is a linear structure and is made of a rigid material; the arc rod is an arc-shaped structure and is made of a plastic material; a rubber strip for contacting the diffusion membrane is embedded on the side of the cross bar facing the diffusion membrane, and a rubber strip for contacting the free-form surface lens array is embedded on the side of the arc rod facing the free-form surface lens array.

6. The PGU backlight system for a vehicle-mounted HUD according to claim 5, characterized in that: There are three groups of tensioning mechanisms, which are spaced apart around the circumference of the arc rod; each group of tensioning mechanisms includes a sleeve, a push rod and a compression spring, one end of the sleeve is rotatably connected to the arc rod through a first intersection, and the other end of the sleeve is provided with a blind hole for accommodating the end of the push rod, the blind hole is arranged along the length direction of the sleeve, and the compression spring is located in the blind hole, one end of the compression spring abuts against the end of the push rod, and the other end abuts against the bottom of the blind hole, and one end of the push rod away from the compression spring is rotatably connected to the cross bar through a second intersection.

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