Vehicle-mounted three-dimensional display device based on pixel grating

Abstract

The invention discloses a vehicle-mounted three-dimensional display device based on a pixel grating, and belongs to the field of vehicle-mounted displayers, a 3D display control module obtains vehicle driving information, and the 3D display control module processes the vehicle driving information into a 3D display data source; the liquid crystal display is in communication connection with the 3D display control module, and the liquid crystal display realizes 3D display graph output; the pixel liquid crystal grating array comprises a plurality of sub-pixel units, the sub-pixel units of the pixel liquid crystal grating array are aligned with RGB pixel units of the liquid crystal display, and the pixel liquid crystal grating array controls light beams with different diffraction angles; the liquid crystal grating reflecting film is pasted on the windshield, the liquid crystal grating reflecting film reflects a 3D image from the pixel liquid crystal grating array, and a virtual image is formed on the front of the windshield. The liquid crystal grating array has the advantages that the structure is compact, other reflecting mirrors and projection mirrors are not needed, and the pixel liquid crystal grating is adopted as a diffraction element, so that the efficiency is good, the thickness is small, and the cost is low. And stray light interference is avoided, and a higher-quality 3D display effect is provided.

Description

Technical Field

[0001] The invention relates to the field of vehicle-mounted displays, and in particular to a vehicle-mounted three-dimensional display device based on pixel gratings. Background Art

[0002] The car head-up display (HUD) is a visual assisted driving system that can provide the driver with key assisted driving information and project the driving information into a virtual image, which is displayed at a certain distance in front of the driver, so that the driver can obtain information such as vehicle speed, fuel level, real-time navigation, etc. in a head-up state, thereby avoiding the blind spot time caused by the driver lowering his head to check driving information, reducing potential traffic accidents, and ensuring driving safety.

[0003] In the prior art, there are three-dimensional head-up display devices that provide high-quality, rich, intuitive and vivid display effects. However, the existing three-dimensional head-up display devices are implemented in two ways: one is to realize naked-eye 3D-HUD display based on the principle of binocular parallax, which can easily lead to visual fatigue and traffic accidents after long-term use, and the whole set of 3D-HUD devices is large in size and requires a large installation space, which is not conducive to vehicle-mounted integrated installation. The other is to realize 3D AR-HUD based on holographic grating, which has the problems of large processing grating period and small viewing angle, as well as high processing cost, low efficiency, and stray light interference, which will seriously affect the display quality. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, one of the objectives of the present invention is to provide a vehicle-mounted three-dimensional display device based on a pixel grating that is not prone to visual fatigue, has a small size, and has a low cost.

[0005] One of the purposes of the present invention is achieved by the following technical solution:

[0006] A vehicle-mounted three-dimensional display device based on pixel grating includes a liquid crystal display, the vehicle-mounted three-dimensional display device based on pixel grating also includes a pixel liquid crystal grating array, a 3D display control module and a liquid crystal grating reflective film,

[0007] The 3D display control module is connected to the vehicle data bus for communication to obtain vehicle driving information, and the 3D display control module processes the vehicle driving information into a 3D display data source;

[0008] The liquid crystal display is installed in front of the driving position in the vehicle and below the windshield. The liquid crystal display is in communication connection with the 3D display control module, and the liquid crystal display realizes 3D display graphic output;

[0009] The pixel liquid crystal grating array includes a plurality of sub-pixel units, the sub-pixel units of the pixel liquid crystal grating array are aligned with the RGB pixel units of the liquid crystal display, the pixel liquid crystal grating array is located in front of the driving position in the vehicle and below the windshield, and the pixel liquid crystal grating array controls light beams with different diffraction angles;

[0010] The liquid crystal grating reflective film is pasted on the windshield, and the liquid crystal grating reflective film reflects the 3D image from the pixel liquid crystal grating array to form a virtual image in front of the windshield.

[0011] Furthermore, the pixel liquid crystal grating array is a single-layer structure, and the grating period and direction on the single-layer grating are different.

[0012] Furthermore, the pixel liquid crystal grating array is a double-layer structure, and the pixel liquid crystal grating array includes an upper and a lower layer, and the upper and lower grating periods are the same, but the grating directions are different.

[0013] Furthermore, the virtual image is 5 to 10 meters away from the windshield.

[0014] Furthermore, the structure of the 3D display control module is a box structure, and the size of the box structure is 5-50 cm.

[0015] Furthermore, the vehicle driving information includes at least one of vehicle speed, navigation, and intelligent driving information.

[0016] Furthermore, the liquid crystal display is a high-resolution liquid crystal display.

[0017] Furthermore, the pixel liquid crystal grating array, the liquid crystal display and the liquid crystal grating reflective film are located on the same straight line.

[0018] Furthermore, the pixel liquid crystal grating array is located between the liquid crystal display and the liquid crystal grating reflective film.

[0019] Furthermore, the thickness of the pixel liquid crystal grating array is in the micron level.

[0020] Compared with the prior art, the in-vehicle three-dimensional display device based on pixel grating of the present invention comprises a liquid crystal display, a pixel liquid crystal grating array, a 3D display control module and a liquid crystal grating reflective film, the 3D display control module is connected to the vehicle data bus for communication to obtain vehicle driving information, and the 3D display control module processes the vehicle driving information into a 3D display data source; the liquid crystal display is installed in front of the driving seat in the vehicle and is located below the windshield, the liquid crystal display is connected to the 3D display control module for communication, and the liquid crystal display realizes 3D display graphic output; the pixel liquid crystal grating array comprises a plurality of sub-pixel units, and the sub-pixel units of the pixel liquid crystal grating array are ..., and the liquid crystal display realizes 3D display graphic output; the pixel liquid crystal grating array comprises a plurality of sub-pixel units, and the sub-pixel units of the pixel liquid crystal grating array are connected to the vehicle data bus for communication to obtain vehicle driving information, and the 3D display control module processes the vehicle driving information into a 3D display data source; the liquid crystal display is installed in front of the driving seat in the vehicle and is located below the windshi The RGB pixel units of the liquid crystal display are aligned, and the pixel liquid crystal grating array is located in front of the driving position in the car and below the windshield. The pixel liquid crystal grating array controls light beams with different diffraction angles; the liquid crystal grating reflective film is pasted on the windshield, and the liquid crystal grating reflective film reflects the 3D image from the pixel liquid crystal grating array to form a virtual image in front of the windshield. The vehicle-mounted three-dimensional display device based on the pixel grating of the present invention has a compact structure, does not require other reflectors and projection mirrors, and uses the pixel liquid crystal grating as a diffraction element, which has the advantages of good efficiency, thin thickness, and no stray light interference, and can provide a higher quality 3D display effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a vehicle-mounted three-dimensional display device based on a pixel grating according to the present invention;

[0022] Figure 2 A schematic diagram of alignment between a liquid crystal display and a pixel liquid crystal grating array;

[0023] Figure 3 is a schematic diagram of a pixel liquid crystal grating array;

[0024] Figure 4 for Figure 3 Schematic diagram of a sub-pixel unit;

[0025] Figure 5 Schematic diagram of a sub-pixel single-layer multi-period structure;

[0026] Figure 6 Schematic diagram of the double-layer single-period structure of a sub-pixel.

[0027] In the figure: 1. Liquid crystal display; 2. Pixel liquid crystal grating array; 21. Sub-pixel unit; 3. 3D display control module; 4. Liquid crystal grating reflective film. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may be another intermediate component through which it is fixed. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be another intermediate component at the same time. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be another intermediate component at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0031] See also Figure 1 The present application discloses a vehicle-mounted three-dimensional display device based on a pixel grating, comprising a liquid crystal display 1, a pixel liquid crystal grating array 2, a 3D display control module 3 and a liquid crystal grating reflective film 4.

[0032] The 3D display control module 3 is connected to the vehicle data bus to obtain driving information. The vehicle driving information includes at least one of the vehicle speed, navigation, and intelligent driving information. The 3D display control module 3 is in a compact box shape, and the 3D display control module 3 is installed in the engine compartment or passenger compartment of the vehicle. The appearance of the 3D display control module 3 may vary depending on the manufacturer and model, and has the characteristics of waterproof, dustproof and vibration-proof to adapt to the complex environment inside the vehicle. The size of the 3D display control module 3 depends on its functional complexity and the number of hardware components required, and is generally between a few centimeters and tens of centimeters. Specifically, in the present embodiment, the size of the box structure of the 3D display control module 3 is 5-50cm. The 3D display control module 3 processes the information to be displayed into a 3D display data source and transmits it to the liquid crystal display 1 connected thereto.

[0033] The LCD 1 is a high-resolution LCD. The LCD 1 is connected to the 3D display control module 3 for communication, and the LCD 1 implements 3D display graphics output. Figure 2 The RGB LED pixel units of the liquid crystal display 1 are precisely aligned with the sub-pixel units of the pixel liquid crystal grating array 2. The liquid crystal display 1 is installed in front of the driver's seat and below the windshield. The pixel liquid crystal grating array 2 displays the data source from the liquid crystal display 1 in space as a 3D effect.

[0034] Please continue reading Figure 3 as well as Figure 4 The pixel liquid crystal grating array 2 includes a plurality of sub-pixel units 21. The sub-pixel units 21 of the pixel liquid crystal grating array 2 are aligned with the RGB pixel units of the liquid crystal display 1. The pixel liquid crystal grating array 2 is located in front of the driving seat in the vehicle and below the windshield. The pixel liquid crystal grating array 2 controls light beams with different diffraction angles.

[0035] The pixel liquid crystal grating array 2 has two structural modes.

[0036] Please continue reading Figure 5 The pixel liquid crystal grating array 2 is a single-layer structure, and the grating period and direction on the single-layer grating are different. The single-layer grating is prepared by laser direct writing optical alignment and holographic projection optical alignment.

[0037] Please continue reading Figure 6 The pixel liquid crystal grating array 2 is a double-layer structure. The pixel liquid crystal grating array 2 includes an upper and a lower layer. The upper and lower grating periods are the same, but the grating directions are different. The angle control of different diffraction beams is achieved by controlling the directions of the upper and lower gratings. The double-layer pixel grating is prepared by laser direct writing optical alignment and holographic projection optical alignment.

[0038] The pixel liquid crystal grating array 2 controls light beams with different diffraction angles, and the thickness of the pixel liquid crystal grating array 2 is in the micron level.

[0039] The liquid crystal grating reflective film 4 is pasted on the windshield to reflect the 3D image from the liquid crystal display 1 and the pixel liquid crystal grating array 2, forming a virtual image in front of the windshield, and the virtual image is 5 to 10 meters away from the windshield. The pixel liquid crystal grating array 2, the liquid crystal display 1 and the liquid crystal grating reflective film 4 are located on the same straight line. The pixel liquid crystal grating array 2 is located between the liquid crystal display 1 and the liquid crystal grating reflective film 4.

[0040] The present invention discloses a vehicle-mounted three-dimensional display device based on a pixel grating, which has a compact structure and does not require other reflectors and projection mirrors. The pixel liquid crystal grating 2 is used as a diffraction element, which has the advantages of good efficiency, thin thickness, and no stray light interference. It is combined with a vehicle-mounted HUD system to realize naked-eye 3D HUD display, and can provide a higher quality 3D display effect.

[0041] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which are equivalent modifications and improvements made to the above embodiments based on the essential technology of the present invention, and all of them belong to the protection scope of the present invention.

Claims

1. A vehicle-mounted three-dimensional display device based on pixel grating, comprising a liquid crystal display, characterized in that: The vehicle-mounted three-dimensional display device based on pixel grating also includes a pixel liquid crystal grating array, a 3D display control module and a liquid crystal grating reflective film. The 3D display control module is connected to the vehicle data bus for communication to obtain vehicle driving information, and the 3D display control module processes the vehicle driving information into a 3D display data source; The liquid crystal display is installed in front of the driving position in the vehicle and below the windshield. The liquid crystal display is in communication connection with the 3D display control module, and the liquid crystal display realizes 3D display graphic output; The pixel liquid crystal grating array includes a plurality of sub-pixel units, the sub-pixel units of the pixel liquid crystal grating array are aligned with the RGB pixel units of the liquid crystal display, the pixel liquid crystal grating array is located in front of the driving position in the vehicle and below the windshield, and the pixel liquid crystal grating array controls light beams with different diffraction angles; The liquid crystal grating reflective film is pasted on the windshield, and the liquid crystal grating reflective film reflects the 3D image from the pixel liquid crystal grating array to form a virtual image in front of the windshield.

2. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 1, characterized in that: The pixel liquid crystal grating array is a single-layer structure, and the grating period and direction on the single-layer grating are different.

3. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 1, characterized in that: The pixel liquid crystal grating array is a double-layer structure, and the pixel liquid crystal grating array includes an upper and a lower layer, and the upper and lower grating periods are the same, but the grating directions are different.

4. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 1, characterized in that: The virtual image is 5 to 10 meters away from the windshield.

5. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 1, characterized in that: The structure of the 3D display control module is a box structure, and the size of the box structure is 5-50 cm.

6. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 1, characterized in that: The vehicle driving information includes at least one of vehicle speed, navigation, and intelligent driving information.

7. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 1, characterized in that: The liquid crystal display is a high-resolution liquid crystal display.

8. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 1, characterized in that: The pixel liquid crystal grating array, the liquid crystal display and the liquid crystal grating reflective film are located on the same straight line.

9. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 8, characterized in that: The pixel liquid crystal grating array is located between the liquid crystal display and the liquid crystal grating reflective film.

10. The vehicle-mounted three-dimensional display device based on pixel grating according to claim 1, characterized in that: The thickness of the pixel liquid crystal grating array is in the micron level.

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