Liquid crystal display device and head-up display system

Abstract

The embodiment of the present invention relates to the field of laser display technology, and discloses a liquid crystal display device and a head-up display system. The liquid crystal display device includes: a liquid crystal display device, including: a laser light source, a reflector, a driving device, a controller, and a display module; the driving device is connected to the reflector, the controller is connected to the driving device, and the reflector is arranged between the laser light source and the display module; the laser light source is used to emit a laser beam, the reflector is used to receive and reflect the laser beam to the display module, and the controller is used to control the driving device to drive the reflector to move so that the laser beam reflected by the reflector covers the entire back of the display module to provide backlight for the display module. In the above manner, this embodiment can solve the problem of the display module heating up due to long-term exposure, and can enhance the image brightness.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of laser display technology, and in particular to a liquid crystal display device and a head-up display system. Background Art

[0002] A head-up display (HUD) system refers to a driver-centric, blindly operated multi-function instrument panel that projects important information such as speed and navigation onto the windshield in front of the driver, allowing the driver to see important information without lowering or turning his head.

[0003] The virtual image produced by the HUD is primarily formed through a reflector, typically a windshield. To ensure optimal visibility, the windshield must have high transmittance. When the windshield reflects the HUD image, only about 10% of the light reaches the human eye, resulting in low reflection efficiency.

[0004] During the process of implementing the embodiments of the present invention, the inventors of the present invention discovered that currently, the backlight of the HUD's liquid crystal display module is implemented by direct projection of an LED light source array. To improve the clarity of the displayed image, the power of the LED light source array must be increased as a whole, which makes it easier for the heat of the entire liquid crystal display module to rise. Summary of the Invention

[0005] The main technical problem solved by the embodiments of the present invention is to provide a liquid crystal display device and a head-up display system, which solves the problem of heating of the display module due to long-term exposure and can enhance image brightness.

[0006] To solve the above technical problems, a technical solution adopted in an embodiment of the present invention is: providing a liquid crystal display device, comprising: a laser light source, a reflector, a driving device, a controller, and a display module; the driving device is connected to the reflector, the controller is connected to the driving device, and the reflector is arranged between the laser light source and the display module; the laser light source is used to emit a laser beam, the reflector is used to receive and reflect the laser beam to the display module, and the controller is used to control the driving device to drive the reflector to move so that the laser beam reflected by the reflector covers the entire back side of the display module to provide backlight for the display module; wherein, The driving device includes a rotation unit and a translation unit, and both the rotation unit and the translation unit are connected to the controller; the rotation unit is used to drive the reflector to rotate relative to the display module, so that the incident point of the laser beam reflected by the reflector and incident on the display module moves in a first direction on the back side of the display module; the translation unit is used to drive the laser light source to move parallel to the display module, so that the incident point of the laser beam reflected by the reflector and incident on the display module moves in a second direction on the back side of the display module; the first direction is the horizontal direction of the display module, and the second direction is the vertical direction of the display module.

[0007] Optionally, the liquid crystal display device also includes: a beam coupler connected to the laser light source, for synthesizing the laser beams emitted by the laser light source into one laser beam; an optical fiber connected to the beam coupler, for receiving the laser beam synthesized by the beam coupler and transmitting the laser beam; and an optical fiber collimator connected to the optical fiber, for receiving the laser beam transmitted by the optical fiber, collimating the laser beam and outputting it to the reflector.

[0008] Optionally, the liquid crystal display device further includes: a fiber collimator connected to the laser light source, for collimating and outputting the laser beam emitted by the laser light source; an optical fiber connected to the fiber collimator, for receiving the laser beam output by the fiber collimator and transmitting the laser beam; and a beam coupler connected to the optical fiber, for receiving the laser beam transmitted by the optical fiber, combining the laser beams into one laser beam and outputting the laser beam to the reflector.

[0009] Optionally, the liquid crystal display device further includes: a Fresnel lens, disposed between the reflector and the display module, for receiving the laser beam reflected by the reflector, converting the laser beam into a uniform parallel laser beam and emitting the laser beam.

[0010] Optionally, the liquid crystal display device further includes: a diverging lens, disposed between the Fresnel lens and the display module, configured to receive the laser beam emitted by the Fresnel lens, diverge the laser beam, and output it.

[0011] Optionally, the diverging lens is a scattering plate or a fly-eye lens.

[0012] In order to solve the above technical problem, another technical solution adopted in an embodiment of the present invention is: providing a head-up display system, including the above-mentioned liquid crystal display device.

[0013] Optionally, the head-up display system also includes: a turning lens and a concave reflecting mirror, the turning lens is used to receive the image display light beam emitted by the display module of the liquid crystal display device and change the direction of the image display light beam; the concave reflecting mirror is used to receive the image display light beam reflected by the turning lens, amplify the image display light beam and output it.

[0014] Optionally, the turning lens is a plane reflector.

[0015] The beneficial effects of the embodiments of the present invention are as follows: Different from the prior art, the embodiments of the present invention provide a liquid crystal display device and a head-up display system, in which a laser light source emits a laser beam to a reflector, and a controller controls a driving device to drive the reflector to rotate, thereby providing backlight for the display module, reducing the number of light sources and avoiding long-term exposure of the display module, solving the technical problem that the liquid crystal display device is prone to heat generation. In addition, the laser light source outputs a laser beam with a brightness better than the light output by an LED light source, thereby enhancing the image brightness of the liquid crystal display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0017] Figure 1 A schematic structural diagram of a liquid crystal display device provided in one embodiment of the present invention;

[0018] Figure 2 for Figure 1 Schematic diagram of functional modules of the liquid crystal display device;

[0019] Figure 3 for Figure 1 A schematic structural diagram of a controller of a liquid crystal display device;

[0020] Figure 4 for Figure 1Another structural schematic diagram of the liquid crystal display device in;

[0021] Figure 5 A schematic structural diagram of a liquid crystal display device provided in another embodiment of the present invention;

[0022] Figure 6 A schematic structural diagram of a liquid crystal display device provided in yet another embodiment of the present invention;

[0023] Figure 7 for Figure 6 Schematic diagram of functional modules of the liquid crystal display device;

[0024] Figure 8 for Figure 6 A schematic structural diagram of a translation unit of a liquid crystal display device;

[0025] Figure 9 A schematic structural diagram of a head-up display system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] For ease of understanding of the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed on" another element, it can be directly on the other element or there can be one or more centered elements therebetween. When an element is described as being "connected" to another element, it can be directly connected to the other element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "vertical", "horizontal", "left", "right", "up", "down", "inside", "outside", "bottom" etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0027] Unless otherwise defined, all technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification are intended only to describe specific embodiments and are not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0028] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] The liquid crystal display module in the embodiment of the present invention can provide light for the display module through a single light source, avoiding direct projection of the LED light source array, solving the problem of heat generation due to long-term exposure of the display module, and enhancing image brightness by using a laser light source.

[0030] The liquid crystal display module in the embodiment of the present invention can be applied to the head-up display system in this embodiment to improve the heat dissipation problem of the head-up display system and enhance the image brightness.

[0031] Specifically, the liquid crystal display module and the head-up display system will be described below through embodiments.

[0032] Example 1

[0033] See also Figure 1 , is a schematic structural diagram of a liquid crystal display device provided by one embodiment of the present invention. Figure 1 As shown, the liquid crystal display device 100 includes a laser light source 10 , a reflector 20 , a driving device 30 , a controller 40 and a display module 50 .

[0034] The drive device 30 is connected to the reflector 20, and the controller 40 is connected to the drive device 30. The reflector 20 is disposed between the laser light source 10 and the display module 50. The laser light source 10 is used to emit a laser beam, and the reflector 20 is used to receive and reflect the laser beam toward the display module 50. The controller 40 is used to control the drive device 30 to drive the reflector 20 to move so that the laser beam reflected by the reflector 20 covers the entire back surface of the display module 50, thereby providing backlight for the display module 50.

[0035] Specifically, laser light source 10 may include a red laser source, a green laser source, and a blue laser source. By utilizing three primary colors of laser light, laser light source 10 can most realistically reproduce the rich, vibrant colors of the real world, providing a more striking visual experience. For example, red, green, and blue laser light sources can be obtained by using laser diode-pumped all-solid-state lasers and frequency doubling technology.

[0036] The reflector 20 is an optical element that utilizes the law of reflection. The reflector 20 can be a plane reflector, a spherical reflector, or an aspherical reflector, and can be selected based on actual needs. In this embodiment, the reflector 20 is connected to a drive device 30 and is driven by the drive device 30 to move.

[0037] In some embodiments, the driving device 30 includes a first axial driving unit (not shown) and a second axial driving unit (not shown). The first axial driving unit and the second axial driving unit can be motors, such as piezoelectric motors. The first axial driving unit and the second axial driving unit are connected to the reflector 20, and the first axial driving unit and the second axial driving unit are respectively connected to the controller 40. The first axial driving unit is used to drive the reflector 20 to rotate relative to the display module 50, so that the incident point of the laser beam reflected by the reflector 20 entering the display module 50 moves in a first direction on the back side of the display module 50. The second axial driving unit is used to drive the reflector 20 to rotate relative to the display module 50, so that the incident point of the laser beam reflected by the reflector 20 entering the display module 50 moves in a second direction on the back side of the display module 50. The first direction can be the horizontal direction of the display module 50, and the second direction can be the vertical direction of the display module 50. By setting up a first axial drive unit and a second axial drive unit, the laser beam can be reflected by the reflector 20 to the display module 50 and scanned line by line on the display module 50, avoiding the use of a direct projection method of an LED light source array, thereby solving the problem of the display module heating up due to long-term exposure.

[0038] The scanning frequency of the reflector 20 is greater than or equal to 30 Hz, that is, the driving device 30 drives the reflector 20 to move at a frequency greater than or equal to 30 Hz, thereby eliminating the flickering effect of the backlight.

[0039] In some other embodiments, the reflector 20 and the drive device 30 can be replaced by a two-dimensional MEMS scanning mirror. A two-dimensional MEMS scanning mirror is a device that uses a motor to drive the mirror tilt, thereby achieving deflection control of the light beam. Compared with common beam scanning devices such as scanning galvanometers, two-dimensional MEMS scanning mirrors have the characteristics of small size, light weight, low power consumption, and insensitivity to environmental impact. In addition, two-dimensional MEMS scanning mirrors can be integrated with position sensors to achieve higher positioning accuracy. In addition, two-dimensional MEMS scanning mirrors can achieve arbitrary angle deflection, point-to-point beam scanning, and a one-to-one correspondence between drive voltage and scanning angle through analog voltage control. The modular design of the two-dimensional MEMS scanning mirror facilitates the selection of mirrors of various sizes for optimization according to different applications. The two-dimensional MEMS scanning mirror can achieve high-speed, dynamic, and large-angle scanning in both the X and Y directions, with scanning angles reaching -160° to +160°.

[0040] Please also refer to Figure 2 and Figure 3The controller 40 is electrically connected to the driving device 30. The controller 40 is configured to control the driving device 30 to drive the reflector 20 so that the laser beam reflected by the reflector 20 covers the entire back surface of the display module 50, thereby providing backlight for the display module 50. The laser beam covering the entire back surface of the display module 50 means that the reflector 20 causes the laser beam to scan the display module 50 line by line, and the scanning range of the laser beam just covers the entire area of ​​the back panel of the display module 50.

[0041] The controller 40 includes at least one processor 41 and a memory 42. The processor 41 is a processor with certain logical operation capabilities, such as a single chip microcomputer, a microprocessor or a CPU, and the processor 41 may also have one or more processing cores. The processor 41 is connected to the drive device 30 and the memory 42 respectively. The memory 42 may be built into the processor 41 or external to the processor 41. The memory 42 may also be a remotely set memory connected to the processor 41 via a network ( Figure 3 The processor 41 and the memory 42 may be connected via a bus or other means. Figure 3 The example of a bus connection is shown. The memory, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer executable programs, and modules. The processor 41 controls the drive device 30 by executing the non-volatile software programs, instructions, and modules stored in the memory 42.

[0042] Display module 50 is a liquid crystal display screen that displays images by receiving the laser beam reflected by reflector 20. In this embodiment, the laser beam reflected by reflector 20 scans the display module 50 line by line, ensuring that the backlight intensity of the display module 50 at a single point is the intensity of the laser beam illuminating the display module 50 at a single time. This avoids the need for long-term illumination by the LED light source array and enables the use of a lower-power laser light source to produce images of sufficient brightness.

[0043] In some other embodiments, please refer to Figure 4 The liquid crystal display device 100 further includes a Fresnel lens 51 and a diverging lens 52 .

[0044] Among them, the Fresnel lens 51 can be made of polyolefin material or glass material by injection molding, and can adjust the light into parallel light or focusing light, and eliminate part of the spherical aberration. The Fresnel lens 51 is arranged between the reflector 20 and the display module. Specifically, the Fresnel lens 51 is arranged between the reflector 20 and the divergent lens 52, and the focus of the Fresnel lens 51 is on the same horizontal line as the center position of the reflector 20, so that the laser beam reflected by the reflector 20 can be emitted vertically after passing through the Fresnel lens 51. The Fresnel lens 51 is used to receive the laser beam reflected by the reflector 20, convert the laser beam into a uniform parallel laser beam and emit it. Of course, the Fresnel lens 51 can be replaced by an aspheric lens to convert the laser beam reflected by the reflector 20 into a parallel laser beam, so that the laser beam reaches the next optical element (such as the divergent lens 52 or the display module 50) vertically.

[0045] The diverging lens 52 can be a diffuser or a fly-eye lens. A diffuser is an optical element that diverges light, such as frosted glass. A fly-eye lens is an optical element composed of a series of small lenses. Using a double-row fly-eye lens array in a lighting system can achieve high light energy utilization and uniform illumination over a large area. The diverging lens 52 is positioned between the Fresnel lens 51 and the display module 50. It receives the laser beam emitted by the Fresnel lens 50, diverges the laser beam, and outputs it to the display module 50. Among them, the diffusion angle of the laser beam by the diverging lens 52 matches the light-emitting angle of the display module 50. For example, when the liquid crystal display device 100 is applied to a head-up display system, the head-up display system requires the vertical viewing angle of the displayed image to be 20° and the horizontal viewing angle to be 36°. Then, the light-emitting angle of the display module 50 is 20° in the vertical direction and 36° in the horizontal direction. Therefore, after the diverging lens 52 diffuses the laser beam, the light-emitting angle of the display module 50 needs to be 20° in the vertical direction and 36° in the horizontal direction.

[0046] In this embodiment, the liquid crystal display device 100 emits a laser beam to the reflector 20 through the laser light source 10, and the controller 40 controls the driving device 30 to drive the reflector 20 to rotate, thereby providing backlight for the display module 50, reducing the number of light sources and avoiding long-term exposure of the display module, solving the technical problem of the liquid crystal display device being prone to heat. In addition, the laser light source outputs a laser beam with a brightness better than the light output by the LED light source, thereby enhancing the image brightness of the liquid crystal display device.

[0047] Example 2

[0048] See also Figure 5 , is a schematic structural diagram of a liquid crystal display device provided by another embodiment of the present invention. Figure 5As shown, the liquid crystal display device 100 includes a laser light source 10 , a beam coupler 11 , an optical fiber 12 , an optical fiber collimator 13 , a reflector 20 , a driving device 30 , a controller 40 and a display module 50 .

[0049] The laser light source 10 , the reflector 20 , the driving device 30 , the controller 40 and the display module 50 have the same structure as those in the first embodiment and are not described in detail here.

[0050] The beam coupler 11, optical fiber 12, and fiber collimator 13 are disposed between the laser light source 10 and the reflector 20. Specifically, the beam coupler 11 is capable of combining or splitting laser beams. In this embodiment, the beam coupler 11 is connected to the laser light source 10 and can be specifically disposed on the optical fiber input end face of the laser light source 10. The beam coupler 11 is used to combine the laser beams emitted by the laser light source 10 into a single laser beam, thereby achieving high-power, high-efficiency laser output.

[0051] Optical fiber 12 can be a single-mode optical fiber or a multimode optical fiber. Optical fiber 12 is connected to beam coupler 11 and is used to receive the laser beam synthesized by beam coupler 11 and transmit the laser beam. By providing optical fiber 12, the propagation direction of the laser beam can be changed, making the structure of liquid crystal display device 100 more compact.

[0052] The fiber collimator 13 can change the divergence angle of the laser beam, allowing the laser beam to enter other optical components with low loss. In this embodiment, the fiber collimator 13 is connected to the optical fiber 12 and is used to receive the laser beam transmitted by the optical fiber, collimate the laser beam, and output it to the reflector 20.

[0053] It is understood that in other embodiments, the order of the beam coupler 11, the optical fiber 12, and the optical fiber collimator 13 can be changed. For example, the optical fiber collimator 13 is connected to the laser light source 10, the optical fiber collimator 13 is connected to the optical fiber 12, and the optical fiber 12 is connected to the beam coupler 11.

[0054] In this embodiment, by providing a beam coupler 11, an optical fiber 12, and a fiber collimator 13, the laser beam emitted by the laser light source 10 is coupled through the beam coupler 11, then enters the optical fiber 12 for transmission, and then enters the fiber collimator 13 for collimation before being output, thereby improving the power and efficiency of the laser beam and enhancing the image brightness.

[0055] Example 3

[0056] See also Figure 6 , is a structural diagram of a liquid crystal display device provided by another embodiment of the present invention. Figure 6As shown, the liquid crystal display device 100 includes a laser light source 10 , a reflector 20 , a driving device 60 , a controller 40 and a display module 50 .

[0057] The laser light source 10 , the reflector 20 , the controller 40 and the display module 50 have the same structure as those in the first embodiment and are not described in detail here.

[0058] Please also refer to Figure 7 The driving device 60 includes a rotation unit 61 and a translation unit 62. The rotation unit 61 is connected to the reflector 20, and the translation unit 62 is connected to the laser light source 10 and the reflector 20 respectively. The rotation unit 61 and the translation unit 62 are both connected to the controller 40. The rotation unit 61 is used to drive the reflector 20 to rotate relative to the display module 50, so that the incident point of the laser beam reflected by the reflector 20 and incident on the display module 50 moves in a first direction on the back side of the display module 50. The translation unit 62 is used to drive the reflector 20 and the laser light source 10 to move parallel to the display module 50, so that the incident point of the laser beam reflected by the reflector 20 and incident on the display module 50 moves in a second direction on the back side of the display module 50. The first direction can be the horizontal direction of the display module 50, and the second direction can be the vertical direction of the display module 50. By providing the rotating unit 61 and the translating unit 62, the laser beam can be reflected by the reflector 20 to the display module 50 and scanned line by line on the display module 50, avoiding the direct projection method of the LED light source array, thereby solving the problem of the display module heating due to long-term exposure.

[0059] Please also refer to Figure 8The translation unit 62 includes a first plate portion 621, a second plate portion 622, a connecting rod 623, a sliding member 624, and a driving member 625. The first plate portion 621 and the second plate portion 622 are used to be fixed to other components so that the first plate portion 621 and the second plate portion 622 and the display module 50 remain stationary relative to each other. The first plate portion 621 defines a first sliding groove 6210, and the second plate portion 622 defines a second sliding groove 6220. There are two sliding members 624. One sliding member 624 passes through one end of the connecting rod 623 and the first sliding groove 6210 to connect to the laser light source 10, and the other sliding member 624 passes through the other end of the connecting rod 623 and the second sliding groove 6220 to connect to the reflector 20. When the two sliding members 624 slide in the first sliding groove 6210 and the second sliding groove 6220, respectively, they drive the laser light source 10 and the reflector 20 to move simultaneously. The driving member 625 can be a hydraulic cylinder, and the driving member 625 is fixedly connected to the connecting rod 623. Specifically, the driving member 625 can be connected to the middle part of the connecting rod 623. The driving member 625 is also connected to the controller 40. When the controller 40 drives the translation unit 62 to move, the driving member 625 drives the connecting rod 623 to move, so that the sliding member 624 slides on the first sliding groove 6210 and the second sliding groove 6220 respectively, thereby driving the laser light source 10 and the reflector 20 to move simultaneously.

[0060] In some other embodiments, when the area of ​​the display module 50 is less than or equal to the area of ​​the reflector 20, the translation unit 62 can be connected only to the laser light source 10 to drive the laser light source to move parallel to the display module 50, so that the incident point of the laser beam reflected by the reflector 20 entering the display module 50 moves in a second direction on the back side of the display module 50.

[0061] In this embodiment, the liquid crystal display device 100 emits a laser beam to the reflector 20 through the laser light source 10, and the controller 40 controls the driving device 30 to drive the reflector 20 to rotate and move parallel, thereby providing backlight for the display module 50, reducing the number of light sources and avoiding long-term exposure of the display module, solving the technical problem of the liquid crystal display device being prone to heat. In addition, the laser output by the laser light source and the brightness of the laser beam are better than the light output by the LED light source, thereby enhancing the image brightness of the liquid crystal display device.

[0062] Example 4

[0063] See also Figure 9 , is a schematic diagram of the structure of a head-up display system provided by an embodiment of the present invention. Figure 9 As shown, the head-up display system 200 includes a deflecting lens 210, a concave reflector 220, and any one of the liquid crystal display devices 100 in the above-mentioned embodiments 1, 2, and 3. In this embodiment, the liquid crystal display device 100 in the embodiment 1 is taken as an example for description.

[0064] The deflection lens 210 may be a plane reflector that can change the direction of the optical axis, compressing a long optical path into a smaller space. The deflection lens 210 is disposed on one side of the display module 50 of the liquid crystal display device 100. The deflection lens 210 is configured to receive the image display light beam emitted by the display module 50 and change the direction of the image display light beam.

[0065] The concave reflective mirror 220 is disposed on one side of the turning lens 210 . The concave reflective mirror 220 is used to receive the image display light beam reflected by the turning lens 210 , amplify the image display light beam, and output it.

[0066] In this embodiment, when the image display beam output by the concave reflector 220 is projected onto a display carrier, the human eye can observe the image on the display carrier. The display carrier can be a wall, floor, glass, or the like. When the head-up display system 200 is used in a vehicle, the display carrier is a windshield. The windshield receives the amplified image display beam output by the concave reflector 220 and reflects it toward the human eye, allowing the driver to see the image generated by the head-up display system 200.

[0067] In some embodiments, the viewing angle of the head-up display system 200 is adapted to the human visual acuity. Human visual acuity refers to the visual angle of the naked eye. The human eye is sensitive within 10 degrees, can correctly recognize information within 10-20 degrees, and is more sensitive to dynamic objects within 20-30 degrees. Therefore, the viewing angle of the head-up display system 200 must cover at least 10 degrees of the human visual acuity to allow the user to clearly see the image content displayed on the windshield.

[0068] In this embodiment, the head-up display system 200 can obtain a high-brightness display image by setting a turning lens 210, a concave reflector 220 and a liquid crystal display device 100, reduce the number of light sources and avoid long-term exposure of the display module, solve the technical problem of the liquid crystal display device being prone to heat generation, and further solve the heat dissipation problem in the central control space of the car.

[0069] It should be noted that the preferred embodiments of the present invention are given in the specification and drawings of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments do not serve as additional limitations on the content of the present invention. The purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all considered to be within the scope of the description of the present invention; further, it is obvious to those skilled in the art that improvements or changes can be made based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present invention.

Claims

1. A liquid crystal display device, characterized in that: Including: laser light source, reflector, drive device, controller and display module; The driving device is connected to the reflector, the controller is connected to the driving device, and the reflector is arranged between the laser light source and the display module; The laser light source is used to emit a laser beam, the reflector is used to receive and reflect the laser beam toward the display module, and the controller is used to control the driving device to drive the reflector to move so that the laser beam reflected by the reflector covers the entire back surface of the display module to provide backlight for the display module; The driving device includes a rotation unit and a translation unit, both of which are connected to the controller; the rotation unit is used to drive the reflector to rotate relative to the display module, so that the incident point of the laser beam reflected by the reflector and incident on the display module moves in a first direction on the back side of the display module; the translation unit is used to drive the laser light source to move parallel to the display module, so that the incident point of the laser beam reflected by the reflector and incident on the display module moves in a second direction on the back side of the display module; The first direction is the horizontal direction of the display module, and the second direction is the vertical direction of the display module.

2. The liquid crystal display device according to claim 1, wherein The liquid crystal display device further includes: a beam coupler connected to the laser light source and configured to combine the laser light beams emitted by the laser light source into one laser light beam; an optical fiber connected to the beam coupler, configured to receive the laser beam synthesized by the beam coupler and transmit the laser beam; An optical fiber collimator is connected to the optical fiber and is used to receive the laser beam transmitted by the optical fiber, collimate the laser beam and output it to the reflector.

3. The liquid crystal display device according to claim 1, wherein The liquid crystal display device further includes: an optical fiber collimator, connected to the laser light source, and configured to collimate and output the laser beam emitted by the laser light source; an optical fiber connected to the optical fiber collimator, configured to receive the laser beam output by the optical fiber collimator and transmit the laser beam; A beam coupler is connected to the optical fiber, and is used to receive the laser beams transmitted by the optical fiber, combine the laser beams into one laser beam, and output the combined laser beams to the reflector.

4. The liquid crystal display device according to claim 1, wherein The liquid crystal display device further includes: The Fresnel lens is disposed between the reflector and the display module, and is used to receive the laser beam reflected by the reflector, convert the laser beam into a uniform parallel laser beam, and emit the laser beam.

5. The liquid crystal display device according to claim 4, wherein The liquid crystal display device further includes: The diverging lens is disposed between the Fresnel lens and the display module, and is used for receiving the laser beam emitted by the Fresnel lens, diverging the laser beam, and outputting the laser beam.

6. The liquid crystal display device according to claim 5, wherein The diverging lens is a scattering plate or a fly-eye lens.

7. A head-up display system, characterized in that: A liquid crystal display device comprising any one of claims 1 to 6.

8. The head-up display system according to claim 7, characterized in that: The head-up display system further includes: a turning lens and a concave reflector, The turning lens is used to receive the image display light beam emitted by the display module of the liquid crystal display device and change the direction of the image display light beam; The concave reflecting mirror is used to receive the image display light beam reflected by the turning mirror, and amplify the image display light beam and output it.

9. The head-up display system according to claim 8, characterized in that: The turning mirror is a plane reflecting mirror.

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