A vehicle-mounted backlit screen

Abstract

The application relates to a vehicle-mounted backlight screen and relates to the technical field of display screen backlight sources. The vehicle-mounted backlight screen comprises a rear shell, a back plate and a frame; a light-emitting plate group comprising a substrate and a reflecting plate in the frame, and a plurality of LEDs are fixed on the substrate; an optical floating plate group comprising a middle frame, the middle frame is in sliding fit with the frame along the thickness direction of the back plate, a diffusion plate and a light-emitting modulation film layer are arranged in the middle frame in a stacking mode, the diffusion plate is arranged in parallel and spaced apart from the reflecting plate, and the light-emitting modulation film layer is arranged on the side of the diffusion plate away from the reflecting plate; an electric control driving mechanism is fixed on the back plate and is in transmission connection with the middle frame; and an adaptive control mechanism comprises an independent controller and a plurality of photosensitive sensors, and the plurality of photosensitive sensors and the electric control driving mechanism are electrically connected with the independent controller. The backlight screen can adaptively adjust the light scattering degree according to the actual light environment in the vehicle, so as to meet the use requirements of the vehicle in different light environments at day and night.

Description

Technical Field

[0001] This application relates to the technical field of display backlights, and in particular to an automotive backlight screen. Background Technology

[0002] With the development of automotive intelligence, in-vehicle displays have become a core component of human-machine interaction in the car cabin. In-vehicle displays typically include an LCD panel and a backlight screen located behind the LCD panel, which provides a uniform surface light source for the LCD panel.

[0003] Currently, most backlight screens adopt a direct-lit structure, which typically includes a back cover and a substrate, REF (reflective element), LED (light-emitting diode), diffuser plate, and several optical films stacked sequentially within the back cover. The LEDs are mounted on the substrate and pass through the REF, which reflects the light emitted from the LEDs towards the substrate upwards to improve light energy utilization. The diffuser plate scatters and homogenizes the light to transform a point light source into a uniform surface light source. Several optical films focus and polarize the light to further enhance front brightness and optical efficiency.

[0004] Due to the varying driving environments, in bright daylight, vehicle displays require backlights to provide higher brightness to counteract glare and ensure sufficient clarity. Conversely, in low-light conditions at night, the backlights need to provide softer illumination to avoid affecting the driver's vision. Currently, this is primarily achieved by adjusting the LED's drive current or duty cycle: increasing the current under bright daylight to boost overall brightness and decreasing the current under low light at night to reduce overall brightness.

[0005] Regarding the aforementioned technologies, the adjustment methods described above can only change the intensity of the light emitted by the LED, not the degree of light convergence or divergence. Therefore, in bright daylight, simply increasing the brightness leads to a significant increase in overall power consumption, and the diffused light cannot be effectively concentrated to provide high brightness to the front. Conversely, in low-light conditions at night, simply decreasing the brightness does not change the original degree of light convergence or divergence, resulting in uneven and soft light emission that can still easily cause localized glare or visual fatigue in the driver's field of vision. Therefore, the existing backlight adjustment methods are insufficient to meet the usage needs of vehicles in different lighting environments. Summary of the Invention

[0006] This application provides a vehicle-mounted backlight screen, the purpose of which is to meet the needs of vehicles in different lighting environments during the day and night, and to improve the light output effect of the backlight screen in different lighting environments.

[0007] The technical solution for a vehicle-mounted backlight screen provided in this application is as follows: A vehicle-mounted backlight screen includes: a rear shell, comprising a back panel and a frame, the back panel being located within the frame and fixedly connected to the frame; a light-emitting plate assembly, comprising a substrate and a reflector located within the frame, the back panel, the substrate, and the reflector being stacked sequentially, a plurality of LEDs being fixed on the substrate, the LEDs passing through the reflector; an optical floating plate assembly, comprising a middle frame, the middle frame being located within the frame and slidingly engaged with the frame along the thickness direction of the back panel; a diffuser and a light-emitting modulation film layer being stacked within the middle frame, the diffuser and the reflector being arranged parallel and spaced apart, the light-emitting modulation film layer being located on the side of the diffuser facing away from the reflector; an electronically controlled drive mechanism, fixed to the back panel and tractively connected to the middle frame, the electronically controlled drive mechanism being used to drive the middle frame to move along the thickness direction of the back panel; and an adaptive control mechanism, comprising an independent controller and a plurality of photosensors, the plurality of photosensors and the electronically controlled drive mechanism being electrically connected to the independent controller.

[0008] By adopting the above technical solution, the light emitted by the LED is reflected by the reflector and emitted towards the light-emitting side. After being homogenized and focused by the diffuser and the light-emitting modulation film layer, it forms a surface light source, thereby realizing the basic light-emitting function of the backlight screen.

[0009] In the backlight screen, the diffuser plate and the reflector plate are set in parallel and spaced apart. There is a light mixing distance (i.e., OD value) between the light emitting surface of the LED and the diffuser plate. The middle frame and the frame plate slide together. Therefore, under the drive of the electronically controlled drive mechanism, the middle frame can drive the diffuser plate and the light-emitting modulation film layer to move closer to or further away from the reflector plate, thereby changing the OD value.

[0010] When the OD value decreases, the corresponding light mixing distance shortens, and the light is homogenized and emitted before it has enough time to fully diffuse. At this time, the emitted light is focused, thereby increasing the brightness of the front of the backlight screen. Conversely, when the OD value increases, the corresponding light mixing distance lengthens, and the light is fully diffused before reaching the diffuser plate, thereby making the emitted light from the backlight screen more uniform and softer.

[0011] Based on this, several photosensitive sensors collect the actual light intensity inside the vehicle in real time and feed it back to the independent controller. The independent controller determines whether the current environment is strong light or weak light and controls the electronically controlled drive mechanism to work. In strong light environment, the mixing distance is shortened to obtain concentrated high-brightness light to counteract the strong light of the environment, or in weak light environment, the mixing distance is extended to obtain soft and uniform light to avoid affecting the driver's vision.

[0012] Therefore, this backlight screen is no longer limited to changing the overall luminous flux by simply adjusting the LED current or duty cycle. Instead, it can adaptively adjust the degree of light scattering according to the actual lighting environment inside the vehicle, thereby meeting the vehicle's usage needs under different lighting conditions during the day and night.

[0013] Optionally, the light-emitting modulation film layer includes an electrically controlled scattering layer, which includes a polymer-dispersed liquid crystal layer. A transparent conductive substrate is stacked and fixed on both sides of the polymer-dispersed liquid crystal layer. Liquid crystal microdroplets are dispersed in the polymer-dispersed liquid crystal layer, and the transparent conductive substrate is electrically connected to the independent controller.

[0014] By adopting the above technical solution, the independent controller can control whether to apply voltage between the two transparent conductive substrates.

[0015] When no voltage is applied, the liquid crystal droplets in the polymer-dispersed liquid crystal layer are randomly oriented, and their effective refractive index is mismatched with the refractive index of the polymer matrix. Light is strongly scattered at the interface of the liquid crystal droplets, and the electrically controlled scattering layer exhibits a high haze scattering state, and the emitted light is scattered into diffuse light with a wide viewing angle.

[0016] When a voltage is applied, the liquid crystal molecules in the liquid crystal droplets align themselves in the direction of the electric field, and their refractive index approaches that of the polymer matrix. Light passes through directly along the original direction, and the electrically controlled scattering layer exhibits a transparent state with low haze.

[0017] Therefore, by controlling whether a voltage is applied, the independent controller can switch the electronically controlled scattering layer between a scattering state and a transparent state, thereby changing the scattering degree and viewing angle distribution of the light emitted from the backlight screen.

[0018] Optionally, the light-emitting modulation film layer further includes a prism sheet and a dual brightness enhancement film, wherein the diffuser plate, the electrically controlled scattering layer, the prism sheet, and the dual brightness enhancement film are stacked sequentially.

[0019] By adopting the above technical solution, the light is homogenized by the diffuser plate and modulated by the electronically controlled scattering layer, and then enters the prism sheet and the double brightness enhancement film in sequence. The prism sheet gathers the diverged light towards the front to improve the brightness of the front, and the double brightness enhancement film reflects and recovers the polarized light that cannot pass through to improve the light energy utilization rate.

[0020] Since the prism sheet and the dual brightness enhancement film are located on the light-emitting side of the electronically controlled scattering layer, their focusing and polarization recovery effects are coordinated with the switching between the scattering and transparent states of the electronically controlled scattering layer: when the electronically controlled scattering layer is in the transparent state, the narrow-angle light transmitted through the prism sheet is further focused towards the front, and the brightness of the front is enhanced by superposition; when the electronically controlled scattering layer is in the scattering state, the wide-view diffused light can still recover polarized light with the help of the dual brightness enhancement film to compensate for the brightness loss caused by scattering while ensuring the viewing angle, thereby maintaining a high light energy utilization rate while taking into account the viewing angle.

[0021] Optionally, a plurality of microlenses are provided on the side of the diffuser plate away from the light-emitting modulation film layer, and the plurality of microlenses are arranged in an array.

[0022] By employing the above technical solution, a series of microlens arrays are arranged on the side of the diffuser plate away from the light-emitting modulation film layer, thereby enabling the angle conversion of light incident on the diffuser plate. Based on this, by setting the focal length of the microlenses, the microlenses can be matched with the OD value to further alter the light emission effect of the backlight screen. This results in a stronger collimation and focusing effect when the mixing distance is shortened, and conversely, a more complete divergence and homogenization effect when the mixing distance is extended.

[0023] Optionally, some of the microlenses are integrally formed with the diffuser plate.

[0024] By adopting the above technical solution, several microlenses are integrally formed with the diffuser plate, so that the positional relationship of each microlens relative to the diffuser plate is stable and consistent, ensuring the uniformity of light angle conversion.

[0025] Optionally, it also includes a plurality of laser position sensors, which are electrically connected to the independent controller. The laser position sensors are disposed on the back plate, and the detection end of the laser position sensors is disposed opposite to the middle frame along the thickness direction of the back plate.

[0026] By adopting the above technical solution, the laser position sensor can detect the position of the mid-frame along the thickness direction of the back panel in real time and feed back the position signal containing distance information to the independent controller, enabling the independent controller to calculate the current light mixing distance in real time. Based on this, the independent controller can determine whether the mid-frame has moved to the target position.

[0027] Optionally, a plurality of guide grooves are formed on the frame, the depth direction of the guide grooves being set along the thickness direction of the back plate; a plurality of guide blocks are fixed on the middle frame, the guide blocks being set one-to-one with the guide grooves, and the guide blocks being inserted into the corresponding guide grooves, and the guide blocks slidingly engaging with the inner wall of the corresponding guide grooves along the thickness direction of the back plate.

[0028] By adopting the above technical solution, the guide groove can constrain and guide the movement direction of the guide block, so that the middle frame can only translate along the thickness direction of the back plate and limit its sway in other directions, thereby improving the stability of the middle frame sliding in the back shell and the consistency of the light mixing distance adjustment.

[0029] Optionally, the electronically controlled drive mechanism includes a top block, a drive screw, and a drive motor. The length direction of the top block is arranged along the thickness direction of the back plate, and the top block slides with the back plate along its own length direction. One end of the top block abuts against the middle frame along its own length direction, and the other end is drivenly connected to the drive screw. The drive screw is axially arranged along the length direction of the top block. The drive motor is fixed on the back plate, and the drive end of the drive motor is coaxially connected to the drive screw. A pre-pressing component is provided on the frame. The pre-pressing component is located on the side of the middle frame away from the back plate, and the pre-pressing component is used to press the middle frame and the top block together.

[0030] By adopting the above technical solution, the drive motor drives the drive screw to rotate. Since the top block slides with the frame along its own length direction and the length direction is set along the thickness direction of the back plate, the rotation of the drive screw is converted into the linear motion of the top block along the thickness direction of the back plate. The top block then pushes the middle frame to move away from the reflector to increase the light mixing distance.

[0031] Meanwhile, the pre-pressing component located on the side of the middle frame away from the reflector continuously presses the middle frame against the top block. On the one hand, this eliminates the assembly gap between the middle frame and the top block, as well as at the moving joints, reducing the abnormal noise or light mixing distance fluctuations caused by the middle frame jumping relative to the rear shell during vehicle vibration. On the other hand, when the top block retracts, the pre-pressing component provides a clamping force to the middle frame towards the reflector, ensuring that the middle frame is always under force throughout the entire sliding stroke and moves synchronously with the top block, thereby ensuring the stability and accuracy of the light mixing distance adjustment.

[0032] Optionally, the pre-compression assembly includes a base ring disposed on the frame, and a plurality of elastic pre-compression members are disposed between the base ring and the middle frame, with one end of each elastic pre-compression member abutting against the base ring and the other end abutting against the middle frame.

[0033] By adopting the above technical solution, one end of the elastic preload component abuts against the base ring set on the frame to form a supporting reaction force, while the other end applies a continuous elastic force towards the middle frame, thereby driving the middle frame to move closer to the reflector and always pressing it against the drive end of the electronically controlled drive mechanism. Thus, a stable clamping support is formed between the elastic preload component and the rigid drive end, eliminating the fit gap to suppress the floating of the middle frame under vibration, and ensuring that the middle frame remains under force throughout its entire stroke. This works in conjunction with the pushing movement of the top block to ensure that the light mixing distance can be stably maintained after adjustment.

[0034] Optionally, the middle frame includes a bottom frame and a pressure ring. The pressure ring is detachably connected to the bottom frame. The bottom frame is located inside the frame and slides along the thickness direction of the back plate. The electronically controlled drive mechanism is connected to the bottom frame. The diffuser plate and the light-emitting modulation film are both located inside the bottom frame, and the pressure ring abuts against the light-emitting modulation film.

[0035] By adopting the above technical solution, during assembly, the diffuser plate and the light-emitting modulation film layer are first stacked sequentially inside the base frame. Then, the pressure ring is detachably connected to the base frame, so that the pressure ring, the light-emitting modulation film layer, the diffuser plate, and the base frame abut against each other in sequence, thereby clamping and fixing the diffuser plate and the light-emitting modulation film layer into a whole. On the one hand, the detachable connection between the pressure ring and the base frame facilitates the assembly and replacement of each film layer; on the other hand, since the electronically controlled drive mechanism is connected to the base frame, it can drive the diffuser plate and the light-emitting modulation film layer to move synchronously when the base frame moves along the thickness direction of the back plate, ensuring that the relative positions between each film layer remain unchanged during the light mixing distance adjustment process, thereby maintaining the consistency of light-emitting modulation.

[0036] In summary, this application includes at least one of the following beneficial technical effects: 1. This application, through the coordinated design of an optical floating plate assembly, an electronically controlled drive mechanism, an independent controller, and a photosensitive sensor, enables the backlight screen to adjust the light mixing distance between the LED light-emitting surface and the diffuser plate according to the actual light intensity collected inside the vehicle. This shortens the light mixing distance in strong light environments to obtain concentrated, high-brightness light output, and extends the light mixing distance in low light environments to obtain soft and uniform light output, thus meeting the vehicle's usage needs in different lighting environments day and night and improving the backlight screen's light output adaptability in strong and low light environments.

[0037] 2. By setting an electrically controlled scattering layer, this application enables the electrically controlled scattering layer to actively switch between a scattering state and a transparent state, thereby changing the scattering degree and viewing angle distribution of the light emitted from the backlight screen.

[0038] 3. By setting up microlenses and matching the focal length of the microlenses with the light mixing distance within the backlight screen, this application can further change the light output effect of the backlight screen, so that a stronger collimation and focusing effect is obtained when the light mixing distance is shortened, and a more sufficient divergence and homogenization effect is obtained when the light mixing distance is extended. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall structure of the backlight screen in Embodiment 1 of this application.

[0040] Figure 2 This is an exploded view of the backlight screen of Embodiment 1 of this application.

[0041] Figure 3 This is a partial cross-sectional view of the backlight screen of Embodiment 1 of this application.

[0042] Figure 4 This is a schematic diagram of the overall structure of the optical floating plate assembly in Embodiment 1 of this application.

[0043] Figure 5 This is a schematic diagram of the wiring of the adaptive control mechanism in Embodiment 1 of this application.

[0044] Figure 6 This is a partial cross-sectional view of the diffuser plate and the light-emitting modulation film layer in Embodiment 2 of this application.

[0045] Figure 7 This is a partial cross-sectional view of the diffuser plate and the light-emitting modulation film layer in Embodiment 3 of this application.

[0046] Figure 8 This is a schematic diagram of the wiring of the adaptive control mechanism in Embodiment 4 of this application.

[0047] In the diagram, 1. Back cover; 11. Back plate; 12. Frame; 121. Guide groove; 13. Pre-compression assembly; 131. Base ring; 132. Elastic pre-compression component; 2. Light-emitting plate assembly; 21. Substrate; 22. Reflector; 23. LED; 24. Lamp board adhesive; 3. Optical floating plate assembly; 31. Diffuser; 311. Lens array; 3111. Microlens; 32. Light-emitting modulation film; 321. Diffuser sheet; 322. Prism sheet; 323. 1. Dual brightness enhancement film; 324. Electro-controlled scattering layer; 3241. Polymer dispersed liquid crystal layer; 3242. Transparent conductive base layer; 33. Middle frame; 331. Guide block; 332. Bottom frame; 333. Pressure ring; 4. Electro-controlled drive mechanism; 41. Top block; 42. Drive screw; 43. Drive motor; 5. Adaptive control mechanism; 51. Independent controller; 52. Photosensitive sensor; 6. Position detection mechanism; 61. Laser position sensor. Detailed Implementation

[0048] The following is in conjunction with the appendix Figure 1 -Appendix Figure 8 This application will be described in further detail below.

[0049] Example 1: A vehicle-mounted backlight screen, referring to Figure 1 and Figure 2 It includes a rear shell 1, a light-emitting plate group 2, and an optical floating plate group 3.

[0050] Reference Figure 2 and Figure 3 The back cover 1 includes a back plate 11 and a frame 12. The back plate 11 is located inside the frame 12 and is fixedly connected to the frame 12. The light-emitting plate group 2 and the optical floating plate group 3 are both located inside the frame 12, and the back plate 11, the light-emitting plate group 2 and the optical floating plate group 3 are arranged sequentially along the thickness direction of the back plate 11.

[0051] Reference Figure 2 and Figure 3 The light-emitting plate group 2 includes a substrate 21 and a reflector 22, and the optical floating plate group 3 includes a diffuser 31 and a light-emitting modulation film 32. The back plate 11, substrate 21, reflector 22, diffuser 31 and light-emitting modulation film 32 are arranged in parallel and sequentially. The back plate 11, substrate 21 and reflector 22 are stacked sequentially. The reflector 22 and diffuser 31 are arranged in parallel and spaced apart. The diffuser 31 and light-emitting modulation film 32 are stacked.

[0052] Reference Figure 2 and Figure 3 The light-emitting plate assembly 2 also includes a number of LEDs 23, which are fixed on the substrate 21. The reflector 22 has a number of through holes, and the LEDs 23 are arranged in a one-to-one correspondence with the through holes. The LEDs 23 are located in the corresponding through holes, and the light-emitting surface of the LEDs 23 is located between the reflector 22 and the diffuser 31 and is spaced apart from the diffuser 31.

[0053] Reference Figure 2 and Figure 3 The optical floating plate assembly 3 also includes a middle frame 33, which is located inside the frame 12 and slides with the frame 12 along the thickness direction of the back plate 11. The diffuser 31 and the light-emitting modulation film layer 32 are fixed inside the middle frame 33.

[0054] Reference Figure 2 and Figure 3 Several electrically controlled drive mechanisms 4 are also provided between the middle frame 33 and the side frame 12. The electrically controlled drive mechanisms 4 are fixed on the back plate 11 and are connected to the middle frame 33 in a transmission manner. The driving direction of the electrically controlled drive mechanisms 4 is set along the thickness direction of the back plate 11.

[0055] Since the light-emitting surface of LED23 is spaced from the diffuser plate 31 to form a light mixing distance, i.e. OD value, the size of the OD value directly affects the brightness, uniformity and viewing angle of the backlight screen. The smaller the OD value, the shorter the light mixing distance, the more concentrated the light, and the higher the brightness of the front. The larger the OD value, the longer the light mixing distance, the more diffused the light, and the more uniform and soft the light output.

[0056] Based on this, with the aforementioned rear shell 1, light-emitting plate assembly 2, and optical floating plate assembly 3 arranged in a coordinated manner, referring to... Figure 3 The light emitted by LED23 is reflected by reflector 22 and emitted towards the light-emitting side. After being homogenized, focused and polarized by diffuser 31 and light-emitting modulation film 32, it forms a surface light source, thereby realizing the basic light-emitting function of the backlight screen.

[0057] At the same time, refer to Figure 3Driven by the electronically controlled drive mechanism 4, the middle frame 33 can move the diffuser plate 31 and the light-emitting modulation film layer 32, thereby adjusting the OD value accordingly. This allows the brightness and viewing angle of the backlight screen to be changed by adjusting the OD value to meet usage requirements.

[0058] Reference Figure 2 and Figure 3 In the back cover 1, the back panel 11 and the frame 12 are integrally formed, and the back panel 11 and the frame 12 are made of aluminum-magnesium alloy.

[0059] Reference Figure 2 A plurality of guide grooves 121 are formed on the side of the frame 12 away from the back plate 11, and the depth direction of the guide grooves 121 is set along the thickness direction of the back plate 11.

[0060] Reference Figure 2 and Figure 4 Several guide blocks 331 are fixed on the side wall of the middle frame 33. The guide blocks 331 are set one-to-one with the guide grooves 121. The guide blocks 331 are inserted into the corresponding guide grooves 121 and slide along the thickness direction of the back plate 11 with the inner wall of the corresponding guide groove 121.

[0061] Based on the cooperation of guide groove 121 and guide block 331, guide groove 121 can provide guidance and limit for the sliding of guide block 331, thereby improving the stability of the middle frame 33 sliding on the back shell 1.

[0062] Reference Figure 2 and Figure 3 A pre-compression assembly 13 is also provided on the side of the frame 12 away from the back plate 11. The pre-compression assembly 13 includes a base ring 131, which is detachably connected to the frame 12. The middle frame 33 is located between the base ring 131 and the back plate 11 along the thickness direction of the back plate 11. A plurality of elastic pre-compression members 132 are provided on the base ring 131. The elastic pre-compression members 132 are correspondingly provided with guide blocks 331. The elastic pre-compression members 132 are located in the corresponding guide grooves 121, and one end of the elastic pre-compression member 132 abuts against the corresponding guide block 331, and the other end abuts against the base ring 131.

[0063] With the design of the pre-compression component 13, the elastic pre-compression component 132 continuously applies elastic force to the guide block 331 in the direction of the back plate 11, thereby driving the middle frame 33 to move towards the back plate 11, so that the middle frame 33 is always pressed against the drive end of the electronically controlled drive mechanism 4.

[0064] Based on this, on the one hand, the elastic preload 132 can eliminate the assembly gap between the middle frame 33 and the electronically controlled drive mechanism 4, as well as between the guide block 331 and the guide groove 121, thereby reducing the abnormal noise or OD value fluctuation caused by the middle frame 33 jumping relative to the rear shell 1 during vehicle vibration; on the other hand, when the electronically controlled drive mechanism 4 drives the middle frame 33 to move, the elastic preload 132 can provide a reverse clamping force to the middle frame 33, so that the middle frame 33 is always under force throughout the entire sliding stroke, thereby ensuring the stability and accuracy of OD value adjustment.

[0065] In this embodiment, refer to Figure 3 The elastic preload element 132 is a spring or a sheet spring. The number of elastic preload elements 132 is the same as the number of guide blocks 331 and is not less than four. The four elastic preload elements 132 are evenly spaced along the circumference of the middle frame 33. The elastic coefficient of a single elastic preload element 132 is not less than 5N / mm, and the pre-compression amount when the middle frame 33 is at the minimum OD value position is not less than 3mm, so that the preload force provided by a single elastic preload element 132 is not less than 15N, and the total preload force provided by the four elastic preload elements 132 is not less than 60N.

[0066] Since the maximum vibration inertial force borne by the optical floating plate assembly 3 in a vehicle environment is approximately its own weight multiplied by the vibration acceleration, and the self-weight of the optical floating plate assembly 3 is typically no more than 0.3 kg, and the maximum vibration acceleration in a vehicle is typically no more than 10 g, its maximum vibration inertial force is approximately 30 N. Accordingly, the total preload provided by the elastic preload member 132 is greater than the maximum vibration inertial force of the optical floating plate assembly 3, so that the guide block 331 is continuously pressed against the drive end of the electronically controlled drive mechanism 4 without detaching, thereby forming a stable support similar to a rigid connection between the elastic preload member 132 and the rigid drive end, preventing the guide block 331 from floating in the guide groove 121.

[0067] In this embodiment, refer to Figure 2 and Figure 3 The base ring 131 is connected to the frame 12 by screws or by clips.

[0068] Reference Figure 2 and Figure 3The electrically controlled drive mechanism 4 includes a top block 41, a drive screw 42, and a drive motor 43. The length of the top block 41 is arranged along the thickness direction of the back plate 11. A lifting hole is formed through the back plate 11, with its axial direction along the thickness direction of the back plate 11. The lifting holes correspond one-to-one with the guide grooves 121, and the lifting holes penetrate the bottom of the corresponding guide grooves 121. The top block 41 is inserted into the corresponding lifting hole and slides along the axial direction of the lifting hole. The drive screw 42 is arranged axially along the length direction of the top block 41 and is screwed to the top block 41. The drive motor 43 is fixed on the back plate 11, and the drive end of the drive motor 43 is coaxially connected to the drive screw 42. The end of the top block 41 that is away from the drive motor 43 along its own length direction abuts against the corresponding guide block 331.

[0069] In this embodiment, the top block 41 has a rectangular or polygonal cross-section, and the shape of the lifting hole cross-section matches the shape of the corresponding top block 41. Based on the non-circular cross-section of the top block 41 and the lifting hole, the top block 41 can only translate along its own length when driven by the drive screw 42, thereby realizing the linear lifting motion of the top block 41.

[0070] Based on this, under the design of the electric control drive mechanism 4, the drive motor 43 drives the drive screw 42 to rotate, and the drive screw 42 drives the top block 41 to move linearly along the axial direction of the lifting hole. The top block 41 pushes the guide block 331 to overcome the elastic force of the elastic preload 132 and drive the middle frame 33 to move away from the back plate 11 to increase the OD value, or under the elastic force of the elastic preload 132, it moves towards the back plate 11 as the top block 41 retracts to decrease the OD value. At this time, the magnitude of the OD value is adjustable.

[0071] In another embodiment, the electronically controlled drive mechanism 4 can also be an electromagnetic push rod, which has a simple structure and faster response.

[0072] In another embodiment, one end of the top block 41 is fixedly connected to the corresponding guide block 331, in which case the pre-compression component 13 does not need to be set.

[0073] Reference Figure 2 and Figure 3 In the light-emitting plate assembly 2, a lamp plate adhesive 24 is provided on the side of the substrate 21 facing the back plate 11, and the lamp plate adhesive 24 fixes the substrate 21 to the back plate 11. The lamp plate adhesive 24 is a thermally conductive double-sided tape or a thermally conductive structural adhesive.

[0074] Reference Figure 2 and Figure 3 The substrate 21 is a printed circuit board, and several LEDs 23 are arranged in a matrix on the substrate 21, so that the light output is more uniform.

[0075] Reference Figure 2 and Figure 3 In the optical floating plate assembly 3, the light-emitting modulation film layer 32 includes a diffuser 321, a prism sheet 322, and a dual brightness enhancement film 323, which are stacked sequentially.

[0076] Based on the configuration of the light-emitting modulation film layer 32, the diffuser plate 31 performs a first scattering and homogenization of the point light source emitted by the LED 23; the diffuser sheet 321 performs a second scattering of the light homogenized by the diffuser plate 31 to further improve the uniformity of the emitted light; the prism sheet 322 adopts a brightness enhancement film (BEF) with a microprism array structure, which can focus the diverged light towards the front to improve the front brightness; the dual brightness enhancement film 323 adopts a reflective polarizer (DBEF), which can perform polarization recovery and reuse of the light, thereby reflecting the polarized light that cannot pass through backlight back into the backlight screen for recycling to further improve the light energy utilization rate and front brightness. Therefore, with the sequential arrangement of the diffuser plate 31, diffuser sheet 321, prism sheet 322 and dual brightness enhancement film 323, the point light source emitted by the LED 23 can be transformed into a uniform, bright and efficient surface light source.

[0077] It should be noted that the diffuser 321, prism sheet 322, and dual brightness enhancement film 323 are all conventional optical films well known to those skilled in the art. Their specific structures and film-forming processes are common knowledge in the field and can all be obtained commercially. Therefore, they will not be described in detail here.

[0078] Reference Figure 3 and Figure 4 The middle frame 33 includes a bottom frame 332 and a pressure ring 333, which is detachably connected to the bottom frame 332. The pressure ring 333 and the bottom frame 332 are connected by screws or by clips.

[0079] Reference Figure 2 and Figure 3 The diffuser plate 31, diffuser sheet 321, prism sheet 322 and double brightness enhancement film 323 are stacked sequentially between the pressure ring 333 and the bottom frame 332. The pressure ring 333 is in contact with the double brightness enhancement film 323, and the bottom frame 332 is in contact with the diffuser plate 31.

[0080] Reference Figure 2 and Figure 3 The bottom frame 332 is located inside the frame 12 and slides along the thickness direction of the back plate 11 with the frame 12. Several guide blocks 331 are located on the side wall of the bottom frame 332 and are fixedly connected to the bottom frame 332. The drive end of the electric drive mechanism 4 abuts against the bottom frame 332.

[0081] Based on the structural design of the middle frame 33, when assembling the optical floating plate assembly 3, the diffuser plate 31, diffuser sheet 321, prism sheet 322 and dual brightness enhancement film 323 are first stacked in sequence inside the bottom frame 332. Then, the pressure ring 333 is detachably connected to the bottom frame 332, thereby clamping and fixing the diffuser plate 31 and the light-emitting modulation film layer 32 between the pressure ring 333 and the bottom frame 332. Then, the diffuser plate 31 and the light-emitting modulation film layer 32 are assembled into an integral optical floating plate assembly 3, which facilitates the assembly and replacement of each film layer.

[0082] Reference Figure 5 The vehicle-mounted backlight screen also includes an adaptive control mechanism 5, which comprises an independent controller 51 and several photosensors 52. The photosensors 52 are mounted on the frame 12 or distributed within the corresponding vehicle interior. The photosensors 52, the drive motor 43, and the substrate 21 are all electrically connected to the independent controller 51. The independent controller 51 is a microcontroller (MCU) or a field-programmable gate array (FPGA); the photosensors 52 are ambient light sensors (ALS) or photodiodes.

[0083] Under the design of the adaptive control mechanism 5, the photosensitive sensor 52 collects the ambient light intensity inside the vehicle in real time and converts it into a light signal to feed back to the independent controller 51. The independent controller 51 determines whether the current environment is a strong light environment or a weak light environment based on the light signal, and outputs the corresponding control signal to control the drive motor 43 to work, and to adjust the drive current or duty cycle of several LEDs 23.

[0084] It should be noted that in this embodiment, the actual ambient light intensity inside the vehicle is collected by the photosensitive sensor 52 as the basis for control, rather than directly connected to the vehicle system to obtain the time to determine whether it is day or night. The reason is that the actual lighting environment inside the vehicle does not strictly correspond to the time of day or night.

[0085] Specifically, when driving during the day, if a vehicle enters a tunnel, underground parking garage, under an overpass, or encounters rain, tree shade, or other situations, the light intensity inside the vehicle will significantly decrease, approaching the low-light environment of night. However, when driving at night, if a vehicle passes through a brightly lit road section, a bright light strip inside a tunnel, or is illuminated by the high beams of oncoming vehicles, the light intensity inside the vehicle will significantly increase, approaching the bright light environment of daytime.

[0086] Therefore, relying solely on the vehicle's infotainment system's time to determine day and night cannot accurately reflect the actual lighting environment inside the vehicle, resulting in a mismatch between the backlight adjustment and actual usage needs. However, by directly collecting the actual light intensity inside the vehicle using the photosensor 52, the independent controller 51 can judge and adjust according to the real-time light intensity. Specifically, it adjusts to daytime mode when the vehicle is in a strong light environment and to nighttime mode when the vehicle is in a weak light environment, thus essentially achieving adaptive daytime and nighttime adjustment based on changes in the vehicle's lighting environment.

[0087] The implementation principle of this application embodiment is as follows: when the vehicle backlight screen is working, the photosensitive sensor 52 collects the ambient light intensity inside the vehicle in real time and feeds it back to the independent controller 51.

[0088] When the interior of the vehicle is in a bright light environment, the independent controller 51 determines that the backlight screen needs to provide high brightness output. At this time, the independent controller 51 controls the drive motor 43 to work, thereby driving the middle frame 33 to reduce the OD value, thereby shortening the light mixing distance, so that the light is focused and the front brightness is increased. At the same time, the independent controller 51 adjusts the drive current or duty cycle of the LED 23 to cooperate in improving the overall brightness, so that the backlight screen can provide focused high brightness output in a bright light environment to counteract the strong ambient light.

[0089] When the interior of the vehicle is in a low-light environment, the independent controller 51 determines that the backlight screen needs to provide soft and uniform light. At this time, the independent controller 51 controls the drive motor 43 to work in reverse, thereby driving the middle frame 33 to increase the OD value, thereby extending the light mixing distance and making the light more diffused and uniform. At the same time, the independent controller 51 correspondingly reduces the driving current or duty cycle of the LED 23 to reduce the overall brightness, so that the backlight screen can provide soft and uniform light in low-light environments to avoid affecting the driver's vision.

[0090] Example 2: A vehicle-mounted backlight screen, referring to... Figure 6 The difference between this embodiment and embodiment 1 is that the light-emitting modulation film layer 32 includes an electrically controlled scattering layer 324, a prism sheet 322, and a dual brightness enhancement film 323, and the diffuser plate 31, the electrically controlled scattering layer 324, the prism sheet 322, and the dual brightness enhancement film 323 are stacked in sequence.

[0091] The electrically controlled scattering layer 324 includes a polymer-dispersed liquid crystal layer 3241 and transparent conductive substrates 3242 stacked and fixed on both sides of the polymer-dispersed liquid crystal layer 3241. The two transparent conductive substrates 3242 are respectively located between the polymer-dispersed liquid crystal layer 3241 and the diffuser plate 31, and between the polymer-dispersed liquid crystal layer 3241 and the prism sheet 322. Liquid crystal microdroplets are dispersed in the polymer-dispersed liquid crystal layer 3241, and both transparent conductive substrates 3242 are electrically connected to an independent controller 51.

[0092] With the design of the electrically controlled scattering layer 324, when no voltage is applied between the two transparent conductive substrates 3242, the liquid crystal droplets in the polymer-dispersed liquid crystal layer 3241 are randomly oriented. At this time, the light incident on the polymer-dispersed liquid crystal layer 3241 undergoes multiple scatterings at the interface of the liquid crystal droplets, thus making the electrically controlled scattering layer 324 exhibit a high-haze scattering state, and the light output angle distribution after scattering by the electrically controlled scattering layer 324 is widened. When a driving voltage is applied between the two transparent conductive substrates 3242, the liquid crystal molecules in the liquid crystal droplets are oriented along the direction of the electric field, making the effective refractive index of the liquid crystal droplets approach the refractive index of the polymer matrix. At this time, the light incident on the polymer-dispersed liquid crystal layer 3241 no longer undergoes scattering caused by refractive index mismatch at the interface between the liquid crystal droplets and the polymer matrix, but passes directly along the original propagation direction, thus making the electrically controlled scattering layer 324 exhibit a low-haze transparent state. At this time, the light passing through the electrically controlled scattering layer 324 basically maintains the original propagation direction and is not scattered.

[0093] Therefore, by controlling whether a voltage is applied between the two transparent conductive substrates 3242, the electrically controlled scattering layer 324 can switch between a scattering state and a transparent state, thereby changing the degree of scattering of light passing through the electrically controlled scattering layer 324.

[0094] In this embodiment, refer to Figure 6 The transparent conductive substrate 3242 includes a transparent substrate and a transparent conductive film deposited on one side surface of the transparent substrate. The transparent substrate is a polyethylene terephthalate film, and the transparent conductive film is an indium tin oxide (ITO) film, which is deposited on the surface of the transparent substrate using a magnetron sputtering process. In another embodiment, the transparent substrate may also be a thin glass substrate, and the transparent conductive film may also be a fluorine-doped tin oxide film or a silver nanowire film.

[0095] Specifically, the driving voltage applied between the two transparent conductive substrates 3242 is an alternating voltage with a frequency of 50Hz to 1000Hz and an effective value of 24V to 60V. The reason for using an alternating voltage instead of a direct current voltage is that continuously applying a direct current voltage would cause electrochemical degradation and charge accumulation of liquid crystal molecules and ionic impurities under the influence of the electric field, leading to performance degradation of the electro-scattering layer 324 over time. An alternating voltage, on the other hand, can prevent ion accumulation and thus extend the lifespan of the electro-scattering layer 324.

[0096] In this embodiment, refer to Figure 6The polymer-dispersed liquid crystal layer 3241 includes a polymer matrix and a plurality of liquid crystal microdroplets dispersed within the polymer matrix. The polymer matrix is ​​made of UV-curable acrylate resin, and the liquid crystal material used for the liquid crystal microdroplets is a nematic liquid crystal with positive dielectric anisotropy. The mass percentage of the liquid crystal material in the polymer-dispersed liquid crystal layer 3241 is 40% to 60%, and the difference between the refractive index of the polymer matrix and the ordinary light refractive index of the liquid crystal material is no greater than 0.02.

[0097] Based on this refractive index matching design, when a driving voltage is applied between the two transparent conductive substrates 3242, the liquid crystal molecules align along the electric field direction. At this time, the refractive index experienced by light passing through the liquid crystal droplets in a direction perpendicular to the electrically controlled scattering layer 324 is the ordinary refractive index of the liquid crystal material. This refractive index is almost equal to the refractive index of the polymer matrix. Therefore, light passes directly through the interface between the liquid crystal droplets and the polymer matrix with almost no refraction or scattering, and the electrically controlled scattering layer 324 exhibits a highly transparent state with high transmittance. However, when no voltage is applied between the two transparent conductive substrates 3242, the liquid crystal molecules within the liquid crystal droplets are randomly oriented. At this time, the effective refractive index experienced by light passing through the liquid crystal droplets is an intermediate value between the ordinary and extraordinary refractive indices. This value is significantly mismatched with the refractive index of the polymer matrix. Therefore, light is strongly scattered at the interface, and the electrically controlled scattering layer 324 exhibits a highly hazy scattering state.

[0098] Specifically, refer to Figure 6 The polymer-dispersed liquid crystal layer 3241 has a thickness of 8 μm to 20 μm, and the average particle size of the liquid crystal droplets within the polymer-dispersed liquid crystal layer 3241 is 0.5 μm to 5 μm. The average particle size of the liquid crystal droplets affects the haze in the scattering state and the transmittance in the transparent state. Larger droplet sizes result in higher haze in the scattering state but also higher residual haze in the transparent state. Smaller droplet sizes require lower driving voltages but also reduce haze in the scattering state. The aforementioned particle size range balances high haze in the scattering state and low residual haze in the transparent state. A larger thickness of the polymer-dispersed liquid crystal layer 3241 results in higher haze in the scattering state but lower transmittance in the transparent state and a higher required driving voltage. A smaller thickness results in higher transmittance in the transparent state but insufficient haze in the scattering state. The aforementioned thickness range ensures that the haze in the scattering state is not less than 90% while maintaining a transmittance in the transparent state of not less than 80%.

[0099] Based on the design of the above-mentioned transparent conductive base layer 3242 and polymer dispersed liquid crystal layer 3241, the electronically controlled scattering layer 324 is in a scattering state by default when the power is off, and switches to a transparent state when the power is on. Therefore, in the case of circuit failure or power interruption in the vehicle scenario, the electronically controlled scattering layer 324 automatically returns to the scattering state. At this time, the emitted light is scattered and presents a soft diffused light with a wide viewing angle, and there will be no situation where the bright focused light shines directly into the driver's eyes, thus possessing fail-safe characteristics.

[0100] The implementation principle of this application embodiment is as follows: when the vehicle backlight screen is working, the photosensitive sensor 52 collects the ambient light intensity inside the vehicle in real time and feeds it back to the independent controller 51.

[0101] When the vehicle interior is in a bright light environment, the independent controller 51 controls the electronically controlled drive mechanism 4 to reduce the OD value, shortening the light mixing distance. The light emitted by the LED 23 reaches the diffuser plate 31 without sufficient dispersion within the shorter light mixing distance. After initial homogenization by the diffuser plate 31, it still maintains a narrow angle distribution before emitting light. Simultaneously, the independent controller 51 applies a driving voltage to the electronically controlled scattering layer 324, causing the electronically controlled scattering layer 324 to switch to a transparent state. The light with the narrow angle distribution passes directly through the electronically controlled scattering layer 324 without scattering, and then enters the prism sheet 322 where it is further focused towards the front. The dual brightness enhancement film 323 reflects and recovers the polarized light that does not pass through, thus reusing it. At this time, the brightness of the front of the backlight screen is higher.

[0102] When the vehicle interior is in a low-light environment, the independent controller 51 controls the electronically controlled drive mechanism 4 to increase the OD value, thus extending the light mixing distance. The light emitted by the LED 23 is fully diffused to the diffuser plate 31 over the longer light mixing distance, and after being homogenized by the diffuser plate 31, it is emitted at a wide angle. At the same time, the independent controller 51 stops applying the driving voltage to the electronically controlled scattering layer 324, and the electronically controlled scattering layer 324 is in a power-off scattering state. The wide-angle light is further scattered by the electronically controlled scattering layer 324 to form a more uniform and softer ultra-wide viewing angle surface light source. At this time, the backlight screen emits more uniform and softer light.

[0103] Example 3: A vehicle-mounted backlight screen, referring to... Figure 7 The difference between this embodiment and embodiment 2 is that a lens array 311 is provided on the side of the diffuser plate 31 away from the electrically controlled scattering layer 324. The lens array 311 includes a plurality of microlenses 3111, and the plurality of microlenses 3111 are arranged in an array and integrally formed with the diffuser plate 31.

[0104] In this embodiment, refer to Figure 7 Each microlens 3111 has a spherical or aspherical convex shape, the aperture of the microlens 3111 is 50μm to 500μm, the sagitta of the microlens 3111 is 10μm to 100μm, and the focal length of the microlens 3111 is set according to the adjustment range of the OD value.

[0105] Specifically, because the electronically controlled drive mechanism 4 can adjust the position of the optical floating plate assembly 3, the OD value switches between the minimum and maximum limit OD values. Accordingly, the focal length of the microlens 3111 is set between the minimum and maximum limit OD values. For example, if the OD value range is 4mm-7mm, then the focal length of the microlens 3111 is set to 5mm-6mm.

[0106] Based on the above correspondence between the focal length and OD value range of the microlens 3111, the lens array 311 produces drastically different converging effects on the incident light under the two OD values, and the principle is as follows: When the OD value is at its minimum limit, the distance between the light-emitting surface of LED23 and the lens array 311 is less than the focal length of the microlens 3111, meaning that LED23 is located within the focal point of the microlens 3111, and is in an underfocus state. In the underfocus state, the diverging light emitted by LED23 cannot converge to a focal point after being refracted by the microlens 3111, but is instead converted into nearly collimated light with a significantly narrowed divergence angle, which exits from the diffuser plate 31.

[0107] When the OD value is at its maximum limit, the distance between the light-emitting surface of LED23 and the lens array 311 is greater than the focal length of the microlens 3111. That is, LED23 is located outside the focal point of the microlens 3111, and is in an over-focus state. In the over-focus state, the divergent light emitted by LED23 is refracted by the microlens 3111, first converges to the focal point, and then diverges. When it exits from the diffuser plate 31, it forms a wide-angle diffused light with a significantly increased divergence angle.

[0108] Therefore, in the underfocus state with the minimum limiting OD value, the lens array 311 narrows the large-angle divergent light emitted by the LED 23 into a small-angle near-collimated light and inputs it into the electrically controlled scattering layer 324, so the light output by the lens array 311 is a near-collimated light. Conversely, in the overfocus state with the maximum limiting OD value, the lens array 311 diverges the light emitted by the LED 23 into a large-angle diffused light and inputs it into the electrically controlled scattering layer 324, so the light output by the lens array 311 is a wide-angle diffused light.

[0109] In this embodiment, refer to Figure 7 The diffuser plate 31 is made of polycarbonate or polymethyl methacrylate, and the lens array 311 and the diffuser plate 31 are integrally formed by injection molding or by ultraviolet embossing.

[0110] The implementation principle of this application embodiment is as follows: when the vehicle backlight screen is working, the photosensitive sensor 52 collects the ambient light intensity inside the vehicle in real time and feeds it back to the independent controller 51.

[0111] When the vehicle interior is in a strong light environment, the independent controller 51 controls the electronically controlled drive mechanism 4 to reduce the OD value to the minimum limit OD value. At this time, the lens array 311 is in an underfocus state, narrowing the large-angle divergent light emitted by the LED 23 into near-collimated light that exits from the diffuser plate 31. At the same time, the independent controller 51 applies a driving voltage to the electronically controlled scattering layer 324, causing the electronically controlled scattering layer 324 to switch to a transparent state. The near-collimated light passes directly through the electronically controlled scattering layer 324 without scattering and enters the prism sheet 322, where it is further focused towards the front. The dual brightness enhancement film 323 reflects and recovers the polarized light that does not pass through, allowing it to be reused.

[0112] At this time, under the superposition of the under-focus collimation of the lens array 311 and the transparent state of the electronically controlled scattering layer 324, the backlight screen obtains the maximum brightness of highly focused light to counteract strong ambient light.

[0113] When the interior of the vehicle is in a low-light environment, the independent controller 51 controls the electronically controlled drive mechanism 4 to increase the OD value to the maximum limit OD value. At this time, the lens array 311 is in an overfocus state, and the light emitted by the LED 23 is further diffused into wide-angle diffused light after passing through the focal point and emitted from the diffuser plate 31. At the same time, the independent controller 51 stops applying the driving voltage to the electronically controlled scattering layer 324, so that the electronically controlled scattering layer 324 is in a power-off scattering state. The wide-angle diffused light is further scattered by the electronically controlled scattering layer 324 to form a highly uniform ultra-wide viewing angle surface light source.

[0114] At this time, under the superposition of the overfocus divergence of the lens array 311 and the scattering state of the electronically controlled scattering layer 324, the backlight screen emits light more uniformly and softly without obvious local bright areas, thus minimizing the glare impact on the driver's vision in low-light environments.

[0115] When the vehicle interior is in a medium lighting environment and there is a need for shared viewing by passengers, the independent controller 51 controls the electronically controlled drive mechanism 4 to reduce the OD value to the minimum limit OD value or maintain it at the minimum limit OD value. The lens array 311 is in an underfocus state and outputs near-collimated light. At the same time, the independent controller 51 stops applying the driving voltage to the electronically controlled scattering layer 324, so that the electronically controlled scattering layer 324 is in a power-off scattering state. At this time, the near-collimated light is effectively dispersed into uniform light with a medium viewing angle after entering the electronically controlled scattering layer 324 in the scattering state. This maintains sufficient brightness and expands the light output angle to cover more viewing directions, thereby meeting the usage needs of shared viewing by passengers.

[0116] Example 4: A vehicle-mounted backlight screen, referring to... Figure 8 The difference between this embodiment and embodiment 3 is that the vehicle-mounted backlight screen also includes a positioning detection mechanism 6, which includes a plurality of laser position sensors 61, and the plurality of laser position sensors 61 are electrically connected to an independent controller 51.

[0117] A laser position sensor 61 is mounted on the back plate 11, with its detection end aligned directly opposite the middle frame 33 along the thickness direction of the back plate 11. The laser position sensor 61 is a miniature laser displacement sensor with a measurement accuracy of no less than 0.1 mm.

[0118] Based on the design of the positioning detection mechanism 6, when the electronically controlled drive mechanism 4 drives the optical floating plate group 3 to move, the laser position sensor 61 can detect the position of the optical floating plate group 3 in real time and feed back the position signal containing distance information to the independent controller 51 in real time. This enables the independent controller 51 to calculate the current OD value in real time.

[0119] The implementation principle of this application embodiment is as follows: when the vehicle backlight screen is working, the laser position sensor 61 detects the position of the optical floating plate group 3 in real time and feeds it back to the independent controller 51, so that the independent controller 51 can obtain the current OD value in real time.

[0120] When adjusting the OD value according to the ambient light to switch the backlight emission mode, the independent controller 51 determines whether the optical floating plate group 3 has reached the target position based on the current OD value fed back by the laser position sensor 61. Only after confirming that the current OD value has reached the set minimum or maximum limit OD value and remains stable, the independent controller 51 allows the linkage to switch the working state of the electronically controlled scattering layer 324 and adjust the driving parameters of the LED 23, thereby avoiding the abnormal situation where the light is not fully collimated or diverged and emitted brightly during the transition stroke before the OD value is in place, ensuring a strict match between the light emission state and the OD value.

[0121] When the vehicle vibrates during operation, the laser position sensor 61 can capture the displacement fluctuations of the optical floating plate assembly 3. The independent controller 51 controls the electronically controlled drive mechanism 4 in real time to compensate for displacement based on the slight deviation between the current OD value and the target OD value, forming a position closed-loop control to actively counteract vibration displacement and maintain a precise and stable OD value. If the OD value deviates significantly due to severe bumps, the independent controller 51 immediately switches the electronically controlled scattering layer 324 back to the scattering state and reduces the brightness of the LED 23, thereby preventing localized high-brightness light from directly shining into the driver's eyes and achieving safety protection.

[0122] Therefore, this vehicle-mounted backlight screen achieves real-time accurate monitoring and closed-loop control of the OD value through the laser position sensor 61, which not only ensures the accuracy and safety of the light output mode switching, but also improves the optical adjustment accuracy and anti-interference capability of the backlight screen in complex vibration environments.

[0123] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A vehicle-mounted backlight screen, characterized in that, include: The back cover (1) includes a back panel (11) and a frame (12), wherein the back panel (11) is located inside the frame (12) and is fixedly connected to the frame (12); The light-emitting plate assembly (2) includes a substrate (21) located within the frame (12) and a reflector (22). The back plate (11), the substrate (21) and the reflector (22) are stacked in sequence. A plurality of LEDs (23) are fixed on the substrate (21) and the LEDs (23) pass through the reflector (22). An optical floating plate assembly (3) includes a middle frame (33), which is located inside the frame (12) and slides along the thickness direction of the back plate (11) with the frame (12); a diffuser plate (31) and a light-emitting modulation film layer (32) are stacked inside the middle frame (33), the diffuser plate (31) and the reflector plate (22) are arranged parallel to each other and spaced apart, and the light-emitting modulation film layer (32) is located on the side of the diffuser plate (31) away from the reflector plate (22); An electric drive mechanism (4) is fixed on the back plate (11) and is connected to the middle frame (33) in a transmission manner. The electric drive mechanism (4) is used to drive the middle frame (33) to move along the thickness direction of the back plate (11). The adaptive control mechanism (5) includes an independent controller (51) and several photosensitive sensors (52), and the several photosensitive sensors (52) and the electronically controlled drive mechanism (4) are all electrically connected to the independent controller (51).

2. The vehicle-mounted backlight screen according to claim 1, characterized in that, The light-emitting modulation film layer (32) includes an electrically controlled scattering layer (324), which includes a polymer-dispersed liquid crystal layer (3241). A transparent conductive substrate (3242) is stacked and fixed on both sides of the polymer-dispersed liquid crystal layer (3241). Liquid crystal droplets are dispersed within the polymer-dispersed liquid crystal layer (3241), and the transparent conductive substrate (3242) is electrically connected to the independent controller (51).

3. The vehicle-mounted backlight screen according to claim 2, characterized in that, The light-emitting modulation film layer (32) also includes a prism sheet (322) and a dual brightness enhancement film (323), and the diffuser plate (31), the electronically controlled scattering layer (324), the prism sheet (322) and the dual brightness enhancement film (323) are stacked in sequence.

4. The vehicle-mounted backlight screen according to claim 1, characterized in that, The diffuser plate (31) has a plurality of microlenses (3111) on the side opposite to the light-emitting modulation film layer (32), and the plurality of microlenses (3111) are arranged in an array.

5. A vehicle-mounted backlight screen according to claim 4, characterized in that, Several of the microlenses (3111) are integrally formed with the diffuser plate (31).

6. A vehicle-mounted backlight screen according to claim 1, characterized in that, It also includes several laser position sensors (61), which are electrically connected to the independent controller (51). The laser position sensors (61) are disposed on the back plate (11), and the detection end of the laser position sensor (61) is disposed opposite to the middle frame (33) along the thickness direction of the back plate (11).

7. A vehicle-mounted backlight screen according to claim 1, characterized in that, A plurality of guide grooves (121) are formed on the frame (12), and the depth direction of the guide grooves (121) is set along the thickness direction of the back plate (11); a plurality of guide blocks (331) are fixed on the middle frame (33), and the guide blocks (331) are arranged in a one-to-one correspondence with the guide grooves (121), and the guide blocks (331) are inserted into the corresponding guide grooves (121), and the guide blocks (331) slide along the thickness direction of the back plate (11) and slide against the inner wall of the corresponding guide grooves (121).

8. A vehicle-mounted backlight screen according to claim 1, characterized in that, The electronically controlled drive mechanism (4) includes a top block (41), a drive screw (42), and a drive motor (43). The length direction of the top block (41) is arranged along the thickness direction of the back plate (11), and the top block (41) slides with the back plate (11) along its own length direction. One end of the top block (41) abuts against the middle frame (33) along its own length direction, and the other end is connected to the drive screw (42) for transmission. The drive screw (42) is axially arranged along the length direction of the top block (41). The drive motor (43) is fixed on the back plate (11), and the drive end of the drive motor (43) is coaxially connected to the drive screw (42). A pre-pressing component (13) is provided on the frame (12). The pre-pressing component (13) is located on the side of the middle frame (33) away from the back plate (11), and the pre-pressing component (13) is used to press the middle frame (33) and the top block (41) together.

9. A vehicle-mounted backlight screen according to claim 8, characterized in that, The pre-compression component (13) includes a base ring (131), which is disposed on the frame (12). A plurality of elastic pre-compression members (132) are disposed between the base ring (131) and the middle frame (33). One end of the elastic pre-compression member (132) abuts against the base ring (131) and the other end abuts against the middle frame (33).

10. A vehicle-mounted backlight screen according to claim 1, characterized in that, The middle frame (33) includes a bottom frame (332) and a pressure ring (333). The pressure ring (333) is detachably connected to the bottom frame (332). The bottom frame (332) is located inside the frame (12) and slides along the thickness direction of the back plate (11) with the frame (12). The electronically controlled drive mechanism (4) is connected to the bottom frame (332). The diffuser plate (31) and the light-emitting modulation film (32) are both located inside the bottom frame (332), and the pressure ring (333) abuts against the light-emitting modulation film (32).

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