Liquid crystal display device and head-up display system

Abstract

The embodiment of the invention relates to the technical field of laser display, and discloses a liquid crystal display device and a head-up display system. The liquid crystal display device comprises a laser light source, a reflecting mirror, a driving device, a controller and a display module, the driving device is connected with the reflecting mirror, the controller is connected with the driving device, and the reflecting mirror is arranged between the laser light source and the display module; the laser light source is used for emitting laser beams, the reflector is used for receiving and reflecting the laser beams to the display module, and the controller is used for controlling the driving device to drive the reflector to move so that the laser beams reflected by the reflector can cover the whole back face of the display module. Therefore, backlight is provided for the display module. Through the mode, the problem that the display module group is heated due to long-time irradiation can be solved, and the image brightness can be enhanced.

Description

Technical Field

[0001] The 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] The Head Up Display (HUD) system refers to a driver-centric, blindly operated multi-function instrument panel. It is used to project important information such as speed and navigation onto the windshield in front of the driver, so that the driver can see the important information without lowering or turning his head.

[0003] The virtual image generated by the HUD is mainly formed through a reflector, wherein the reflector is generally a windshield. In order not to affect the driving field of vision, the windshield must have a high transmittance. When the windshield reflects the HUD image, only about 10% of the light can enter the human eye, and the reflection efficiency is low.

[0004] The inventors of the present invention discovered during the process of implementing the embodiments of the present invention that currently, the backlight of the liquid crystal display module of the HUD is realized by direct projection of an LED light source array. If the clarity of the displayed image is to be improved, the power of the LED light source array can only 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 the image brightness.

[0006] In order to solve the above technical problems, a technical solution adopted in an embodiment of the present invention is: to provide 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 rotating unit and a translation unit, and both the rotating unit and the translation unit are connected to the controller; the rotating unit is used to drive the reflector to rotate relative to the display module, so that the incident point of the laser light 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 light 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, used to synthesize the laser light beams emitted by the laser light source into one laser light beam; an optical fiber connected to the beam coupler, used to receive the laser light beam synthesized by the beam coupler and transmit the laser light beam; and an optical fiber collimator connected to the optical fiber, used to receive the laser light beam transmitted by the optical fiber, collimate the laser light beam and output it to the reflector.

[0008] Optionally, the liquid crystal display device also includes: a fiber collimator connected to the laser light source, used to collimate the laser beam emitted by the laser light source and output it; an optical fiber connected to the fiber collimator, used to receive the laser beam output by the fiber collimator and transmit the laser beam; a beam coupler connected to the optical fiber, used to receive the laser beam transmitted by the optical fiber, synthesize the laser beams into one laser beam and output it 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, for receiving the laser beam emitted by the Fresnel lens, and diverging and outputting the laser beam.

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

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

[0013] Optionally, the head-up display system also 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 reflector 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 mirror is a plane reflecting mirror.

[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 brightness of the laser beam output by the laser light source is better than that of the light output by the LED light source, thereby enhancing the image brightness of the liquid crystal display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more implementations 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 by one embodiment of the present invention;

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

[0019] Figure 3 for Figure 1 A schematic diagram of the structure 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 by another embodiment of the present invention;

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

[0023] Figure 7 for Figure 6 Schematic diagram of functional modules of a 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] Fig. 9 A schematic diagram of the structure of a head-up display system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to facilitate the understanding of the present invention, the present invention is 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 "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connecting" another element, it can be directly connected to another 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, 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 a limitation of 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 meaning as those commonly understood by those skilled in the art of the present invention. The terms used 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 in this specification includes any and all combinations of one or more of the related 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 heating of the display module due to long-term irradiation, and enhancing the 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] Embodiment 1

[0033] See also Figure 1 , is a schematic diagram of the structure 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 driving device 30 is connected to the reflector 20, and the controller 40 is connected to the driving device 30. The reflector 20 is arranged 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 to the display module 50. The controller 40 is used to control the driving device 30 to drive the reflector 20 to move, so that the laser beam reflected by the reflector 20 covers the entire back side of the display module 50, so as to provide backlight for the display module 50.

[0035] Specifically, the laser light source 10 may include a red laser light source, a green laser light source, and a blue laser light source. By using three primary color lasers, the laser light source 10 can reproduce the rich and gorgeous colors of the objective world most realistically and provide more shocking expression. For example, red, green, and blue laser light sources are obtained by using a laser diode pumped all-solid-state laser and frequency doubling technology.

[0036] The reflector 20 is an optical element that works by using the law of reflection. The reflector 20 can be a plane reflector, a spherical reflector, or an aspherical reflector, which can be selected according to actual needs. In this embodiment, the reflector 20 is connected to the driving device 30 and moves under the drive of the driving device 30.

[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 may 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 may be the horizontal direction of the display module 50, and the second direction may be the vertical direction of the display module 50. By setting up the first axial driving unit and the second axial driving unit, the laser beam can be reflected to the display module 50 through the reflector 20 and scanned line by line on the display module 50, avoiding the direct projection of the LED light source array, thereby solving the problem of heating of the display module due to long-term exposure.

[0038] The scanning frequency of the reflector 20 is greater than or equal to 30 Hz, that is, the movement frequency of the reflector 20 driven by the driving device 30 is 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. The two-dimensional MEMS scanning mirror is a device that drives the mirror surface to tilt through a motor, thereby realizing the deflection control of the light beam. Compared with common beam scanning devices such as scanning galvanometers, the two-dimensional MEMS scanning mirror has the characteristics of small size, light weight, low power consumption, and insensitivity to environmental influences, and the two-dimensional MEMS scanning mirror can be integrated with a position sensor to achieve higher positioning accuracy. In addition, the two-dimensional MEMS scanning mirror can realize arbitrary angle deflection, point-to-point beam scanning, and one-to-one correspondence between the driving voltage and the scanning angle through analog voltage control; the two-dimensional MEMS scanning mirror is designed as a module, so that it is convenient to select mirrors of various sizes to achieve optimization according to different applications; the two-dimensional MEMS scanning mirror can realize high-speed, dynamic, and large-angle scanning in the X and Y directions at the same time, and the scanning angle can reach -160° to +160°.

[0040] Please also read Figure 2 and Figure 3The controller 40 is electrically connected to the driving device 30, and the controller 40 is used to control the driving device 30 to drive the reflector 20 to move, so that the laser beam reflected by the reflector 20 covers the entire back side of the display module 50, so as to provide backlight for the display module 50. The laser beam covers the entire back side of the display module 50, which means that the reflector 20 enables 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 entire 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 logic operation capabilities, such as a single chip microcomputer, a microprocessor or a CPU, etc. 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 in the processor 41 or external to the processor 41. The memory 42 may also be a remotely set memory connected to the processor 41 ( Figure 3 The processor 41 and the memory 42 may be connected via a bus or other means. Figure 3 The example of the bus connection is taken as an example. The memory is a non-volatile computer-readable storage medium that 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 running the non-volatile software programs, instructions and modules stored in the memory 42.

[0042] The display module 50 is a liquid crystal display screen, and the display module 50 displays an image by receiving the laser beam reflected by the reflector 20. In this embodiment, the laser beam reflected by the reflector 20 is scanned line by line on the display module 50, so that the single-point light intensity of the backlight of the display module 50 is the light intensity of the laser beam irradiating the display module 50 once, thereby avoiding long-term irradiation of the LED light source array, and using a relatively low-power laser light source to obtain an image 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 vertically emitted after passing through the Fresnel lens 51. The Fresnel lens 51 is used to receive the laser beam reflected by the reflector 20, so that the laser beam is converted into a uniform parallel laser beam and emitted. Of course, the Fresnel lens 51 can be replaced by an aspherical 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 may be a scattering sheet or a fly-eye lens, wherein the scattering sheet is an optical element capable of diverging light, such as frosted glass; the fly-eye lens is an optical element formed by a series of small lenses, and applying a double-row fly-eye lens array to a lighting system can achieve high light energy utilization and uniform illumination over a large area. The diverging lens 52 is disposed between the Fresnel lens 51 and the display module 50, and is used to receive the laser beam emitted by the Fresnel lens 50, diverge the laser beam, and output it to the display module 50. Among them, the diffusion angle of the laser light beam of the divergent lens 52 matches the light output 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 vertical viewing angle of the light output angle of the display module 50 is 20° and the horizontal viewing angle is 36°. Therefore, after the divergent lens 52 diffuses the laser light beam, the vertical viewing angle of the light output angle of the display module 50 needs to be 20° and the horizontal viewing angle needs to be 36°.

[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 output by the laser light source has 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] Embodiment 2

[0048] See also Figure 5 , is a schematic diagram of the structure 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 will not be described in detail here.

[0050] The beam coupler 11, the optical fiber 12, and the optical fiber collimator 13 are arranged between the laser light source 10 and the reflector 20. Specifically, the beam coupler 11 can combine or split the laser beam. In this embodiment, the beam coupler 11 is connected to the laser light source 10, and can be specifically arranged 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 one laser beam, thereby achieving high-power and high-efficiency laser output.

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

[0052] The fiber collimator 13 can change the divergence angle of the laser beam so that the laser beam enters other optical components with lower loss. In this embodiment, the fiber collimator 13 is connected to the optical fiber 12, and the fiber collimator 13 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 understandable 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 setting the beam coupler 11, the optical fiber 12 and the optical 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 optical fiber collimator 13 for collimation and output, thereby improving the power and efficiency of the laser beam, thereby enhancing the image brightness.

[0055] Embodiment 3

[0056] See also Figure 6 , is a schematic diagram of the structure 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 will not be described in detail here.

[0058] Please also read Figure 7 The driving device 60 includes a rotating unit 61 and a translation unit 62. The rotating unit 61 is connected to the reflector 20, and the translation unit 62 is respectively connected to the laser light source 10 and the reflector 20. The rotating unit 61 and the translation unit 62 are both connected to the controller 40. The rotating 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 entering 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 entering the display module 50 moves in a second direction on the back side of the display module 50. The first direction may be the horizontal direction of the display module 50, and the second direction may 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 to the display module 50 through the reflector 20 and scanned line by line on the display module 50, avoiding the direct projection of the LED light source array, thereby solving the problem of heating of the display module 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 on other components so that the first plate portion 621 and the second plate portion 622 are relatively stationary with the display module 50. The first plate portion 621 is provided with a first sliding groove 6210, and the second plate portion 622 is provided with 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 be connected 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 be connected to the reflector 20, so that when the two sliding members 624 slide on the first sliding groove 6210 and the second sliding groove 6220 respectively, the laser light source 10 and the reflector 20 are driven 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 may 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 light beam reflected by the reflector 20 that enters 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 easy heating of the liquid crystal display device. 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] Embodiment 4

[0063] See also Fig. 9 , is a schematic diagram of the structure of a head-up display system provided by an embodiment of the present invention. Fig. 9 As shown, the head-up display system 200 includes a turning 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 first embodiment is taken as an example for illustration.

[0064] The turning lens 210 may be a plane reflector, which can change the direction of the optical axis and compress a long optical path into a small space. The turning lens 210 is disposed on one side of the display module 50 of the liquid crystal display device 100, and is used 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 reflector 220 is disposed on one side of the turning lens 210 , and is used to receive the image display light beam reflected by the turning lens 210 , and amplify and output the image display light beam.

[0066] In this embodiment, when the image display beam output by the concave reflector 220 is projected onto the display carrier, the human eye can observe the image from the display carrier. The display carrier may be a wall, a ground, a glass, etc. When the head-up display system 200 is applied to a vehicle, the display carrier is a windshield, which is used to receive the image display beam output by the concave reflector 220 after being magnified, and reflect the image display beam to the human eye, so that the driver can see the image generated by the head-up display system 200.

[0067] In some embodiments, the viewing angle range of the head-up display system 200 is adapted to the visual acuity of the human eye. The visual acuity of the human eye refers to the degree of the visual angle of the human eye. The human eye is sensitive within 10 degrees, and can correctly identify information at 10 to 20 degrees, and is more sensitive to dynamic objects at 20 to 30 degrees. Therefore, the viewing angle range of the head-up display system 200 needs to cover at least 10 degrees of the visual acuity of the human eye, so that the user can 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 are not intended to be 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 present invention; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to 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 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 comprises 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.

2. The liquid crystal display device according to claim 1, wherein: The liquid crystal display device further comprises: A beam coupler, connected to the laser light source, and used 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, and used for receiving the laser beam synthesized by the beam coupler and transmitting the laser beam; The optical fiber collimator is connected to the optical fiber and is used for receiving the laser beam transmitted by the optical fiber, collimating the laser beam and outputting it to the reflector.

3. The liquid crystal display device according to claim 1, wherein: The liquid crystal display device further comprises: An optical fiber collimator, connected to the laser light source, and used to collimate and output the laser light beam emitted by the laser light source; An optical fiber connected to the optical fiber collimator, used 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 beam transmitted by the optical fiber, synthesize the laser beams into one laser beam and output it to the reflector.

4. The liquid crystal display device according to claim 1, wherein: The liquid crystal display device further comprises: The Fresnel lens is disposed between the reflector and the display module, and is used for receiving the laser beam reflected by the reflector, converting the laser beam into a uniform parallel laser beam and emitting the laser beam.

5. The liquid crystal display device according to claim 4, characterized in that: The liquid crystal display device further comprises: 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, and diverging and outputting the laser beam.

6. The liquid crystal display device according to claim 5, characterized in that: The divergent 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 to amplify and output the image display light beam.

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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