Backlight source, display control method and device, storage medium and vehicle

Abstract

The invention relates to the technical field of projection display, in particular to a backlight source, a display control method and device, a storage medium and a vehicle. The first area opposite to the image source effective display area and the second area complementary with the first area are divided on the LED lamp panel of the backlight source, the second area is basically located on the periphery of the first area, and the LED lamp beads are arranged in the first area and the second area respectively. Therefore, the average brightness provided by the LED lamp beads in the second area to the image source is lower than the average brightness provided by the LED lamp beads in the first area to the image source. According to the method, the black frame effect caused by the postcard effect and the watching fatigue feeling of a user can be relieved, and particularly, natural transition is presented in the edge area, so that the user experience is optimized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of projection display, in particular to a backlight source, a display control method, equipment, a storage medium and a vehicle. BACKGROUND

[0002] HUD (Head Up Display, Head Up Display) is a new way of vehicle display realized by reflection on the windshield, which specifically emits display light by the optical machine of the HUD display device, and projects the corresponding virtual image on the windshield through the corresponding optical lens to form an augmented display effect with the real world outside the windshield. However, the current light-emitting mechanism of the optical machine cannot guarantee a pure black display effect, which leads to the fact that the display light cannot form the transparent part of the virtual image after passing through the optical system, such as shown in Figure 1 As a result, the part of the final virtual image that does not exist display elements presents a "postcard effect", and the black frame effect is obvious. At the same time, due to the lack of transition between the projection area and the non-projection area, it is easy to cause visual fatigue of the viewer, which seriously affects the user experience. SUMMARY

[0003] The purpose of the present application is to provide a backlight source, a display control method, equipment, a storage medium and a vehicle, which solves the technical problem that the black frame effect of the virtual image projected by the HUD display device in the prior art is obvious, and the opaque effect of the background display area causes visual fatigue of the viewer, and the user experience is poor.

[0004] In order to solve the above technical problems, the technical scheme is adopted as follows.

[0005] In a first aspect, the present application provides a backlight source for providing illumination light for an image source, the backlight source comprising: an LED lamp plate, the LED lamp plate comprising a first region and a second region, the first region being configured to be disposed opposite to an effective display region of the image source, and the second region being configured to be disposed at least partially around the first region; a plurality of LED lamp beads disposed on the LED lamp plate, the LED lamp beads being disposed according to a first distribution in the first region, and the LED lamp beads being disposed according to a second distribution in the second region.

[0006] According to the above description, the optional embodiment divides the LED lamp plate into regions according to the direction from inside to outside, and the separate control of the LED lamp beads in different regions can separately improve the required brightness for the effective display region of the image source, and the brightness buffer zone is set to eliminate the "postcard effect".

[0007] In an optional implementation of the first aspect, the effective display area of the image source is determined according to a design rule of an optical system and / or a display element distribution configured by the HUD display device.

[0008] In an optional implementation of the first aspect, the effective display area of the image source is rectangular.

[0009] In an optional implementation of the first aspect, the effective display area of the image source is elliptical.

[0010] In an optional implementation of the first aspect, the effective display area of the image source is asymmetric.

[0011] According to the above description, the optional implementation can adopt a more adaptive area definition and design through prior planning, and balance the requirements of display element design space and optical projection stability on the basis of improving flexibility.

[0012] In an optional implementation of the first aspect, the first area is configured to be oppositely arranged with the effective display area of the image source, including: The first area is completely opposite to the effective display area of the image source.

[0013] In an optional implementation of the first aspect, the first area is configured to be oppositely arranged with the effective display area of the image source, including: Part of the first area is opposite to the effective display area of the image source.

[0014] In an optional implementation of the first aspect, the first area is configured to be oppositely arranged with the effective display area of the image source, including: Part of the effective display area of the image source is opposite to the first area.

[0015] In an optional implementation of the first aspect, the first area is consistent with the shape of the effective display area of the image source.

[0016] In an optional implementation of the first aspect, the first area is inconsistent with the shape of the effective display area of the image source.

[0017] According to the above description, the position, size and shape of the first area in the optional implementation can be flexibly set according to the effective display area of the image source, which can ensure that the projection brightness of the display element configured in the effective display area of the image source can be mainly controlled by the first area and the corresponding projection quality can be achieved.

[0018] In an optional implementation of the first aspect, the LED lamp beads in the first region are arranged according to a first distribution, and the LED lamp beads in the second region are arranged according to a second distribution, including: The spacing between adjacent LED lamp beads in the first region is smaller than the spacing between adjacent LED lamp beads in the second region.

[0019] According to the above description, the optional implementation realizes that the light-emitting capability of the second region is lower than the light-emitting capability of the first region in hardware, which finally affects the different display light projection intensities between the effective display region and the background display region of the image source.

[0020] In an optional implementation of the first aspect, the LED lamp beads in the first region and the LED lamp beads in the second region are respectively connected to independent driving output channels.

[0021] According to the above description, the optional implementation supports the first region and the second region to provide lighting with different brightness, thereby supporting the adjustment of the effect distribution of the display light projected by the image source.

[0022] In an optional implementation of the first aspect, the LED lamp beads in the first region are arranged according to a first distribution, including: The first distribution adopts a horizontal and vertical array arrangement, at least two rows of LED lamp beads are arranged in the horizontal direction parallel to the long side of the LED lamp panel, and at least two columns of LED lamp beads are arranged in the vertical direction parallel to the short side of the LED lamp panel.

[0023] In an optional implementation of the first aspect, the first distribution adopts a horizontal and vertical array arrangement, at least two rows of LED lamp beads are arranged in the horizontal direction parallel to the long side of the LED lamp panel, and at least two columns of LED lamp beads are arranged in the vertical direction parallel to the short side of the LED lamp panel, including: The LED lamp beads in adjacent rows and / or columns are connected in series to the same driving output channel.

[0024] According to the above description, the optional implementation can make the first region provide uniform brightness to the effective display region of the image source, match the horizontal and vertical arrangement of display elements in the effective display region, and support block backlight control, which is compatible with traditional contrast block dimming.

[0025] In an optional implementation of the first aspect, the LED lamp beads in the second region are arranged according to a second distribution, including: The second distribution adopts a ring arrangement radiating outward from the first region as the center, and the LED lamp beads in the second region at least include a plurality of LED lamp beads arranged according to a first ring and a plurality of LED lamp beads arranged according to a second ring, and the first ring is closer to the first region than the second ring.

[0026] In an optional implementation of the first aspect, the first ring shape and the second ring shape are complete closed loops.

[0027] In an optional implementation of the first aspect, the first ring shape and the second ring shape are partial open loops.

[0028] In an optional implementation of the first aspect, the first ring shape and the second ring shape are consistent with the outer contour of the first area.

[0029] In an optional implementation of the first aspect, the first ring shape and the second ring shape are inconsistent with the outer contour of the first area.

[0030] In an optional implementation of the first aspect, the number of LED lamp beads arranged in the first ring shape is greater than the number of LED lamp beads arranged in the second ring shape.

[0031] In an optional implementation of the first aspect, the second distribution adopts a ring arrangement radiating outward from the first area, the LED lamp beads in the second area at least include a plurality of LED lamp beads arranged in a first ring shape and a plurality of LED lamp beads arranged in a second ring shape, and the first ring shape is closer to the first area than the second ring shape, comprising: the plurality of LED lamp beads arranged in the first ring shape are connected to a first driving output channel, the plurality of LED lamp beads arranged in the second ring shape are connected to a second driving output channel, and the first driving output channel and the second driving output channel support independent control.

[0032] According to the above description, the optional implementation can make the second area provide the brightness of the image source background display area with a sense of hierarchy, so that the finally formed projection area appears more transparent at the edge, and the division line between the edge and the front environment is not obvious.

[0033] In an optional implementation of the first aspect, the first area includes a first inner sub-area and a second inner sub-area, and the second area includes a first outer sub-area close to the first inner sub-area and a second outer sub-area close to the second inner sub-area. The LED lamp beads of the first inner sub-area, the LED lamp beads of the second inner sub-area, the LED lamp beads of the first outer sub-area, and the LED lamp beads of the second outer sub-area are respectively connected to independent driving output channels.

[0034] In an optional implementation of the first aspect, the arrangement rule of the LED lamp beads in the first inner sub-area is consistent with the arrangement rule of the LED lamp beads in the second inner sub-area.

[0035] In an optional implementation of the first aspect, the LED lamp bead arrangement rule in the first inner sub-region is inconsistent with the LED lamp bead arrangement rule in the second inner sub-region.

[0036] In an optional implementation of the first aspect, the first region includes a first inner sub-region and a second inner sub-region, and the second region includes a first outer sub-region close to the first inner sub-region and a second outer sub-region close to the second inner sub-region. When the required drive brightness of the first inner sub-region is higher than the required drive brightness of the second inner sub-region, the LED lamp bead arrangement level of the first outer sub-region is more complex than the LED lamp bead arrangement level of the second outer sub-region.

[0037] In an optional implementation of the first aspect, the LED lamp bead arrangement level of the first outer sub-region is more complex than the LED lamp bead arrangement level of the second outer sub-region includes that: The number of drive output channels configured for the first outer sub-region is greater than the number of drive output channels configured for the second outer sub-region.

[0038] According to the above description, the optional implementation can use a specific backlight scheme for the position and periphery of a specific display element according to the design rule of display element distribution, so as to further improve the visual effect of the entire projection virtual image.

[0039] In a second aspect, the application provides a display device including the backlight source of the first aspect and an image source cooperating with the backlight source, and an optical lens set. The display device projects display light emitted by the image source to a specified position through the optical lens set.

[0040] In a third aspect, the application provides a display control method including: The backlight source cooperates with the image source to divide the LED lamp panel into a first region and a second region, the first region is configured to be arranged opposite to the effective display region of the image source, and the second region is configured to be arranged at least in part around the first region. The second drive brightness of the LED lamp bead in the second region is lower than the first drive brightness of the LED lamp bead in the first region.

[0041] In an optional implementation of the third aspect, the first drive brightness is determined according to the display element in the effective display region.

[0042] In an optional implementation of the third aspect, the first drive brightness and the second drive brightness are controlled by connecting different drive output channels.

[0043] According to the above description, the optional embodiment controls the driving brightness of the first area and the second area respectively, so that the brightness of the periphery is lower than the brightness of the center, thereby forming an effective display area and a background display area in a transition display state around the effective display area under the irradiation of the illumination light, and the black frame effect is suppressed.

[0044] In an optional embodiment of the third aspect, the second driving brightness of the LED lamp beads in the second area is lower than the first driving brightness of the LED lamp beads in the first area, including: The first driving brightness includes a plurality of partition brightnesses, and the plurality of partition brightnesses are determined according to the distribution of display elements in the effective display area.

[0045] According to the above description, the optional embodiment supports the execution of Local Dimming in the first area, so that the contrast adjustment is not affected within the limited design range, and the transition projection of the first area by the second area reduces the boundary feeling of the part with higher contrast.

[0046] In an optional embodiment of the third aspect, the second driving brightness of the LED lamp beads in the second area is lower than the first driving brightness of the LED lamp beads in the first area, including: The first driving output channel and the second driving output channel with different driving brightnesses are controlled, the first driving output channel is responsible for controlling the first annular arrangement of LED lamp beads in the second area close to the first area, and the second driving output channel is responsible for controlling the second annular arrangement of LED lamp beads in the second area away from the first area. The driving brightness controlled by the second driving output channel is lower than the driving brightness controlled by the first driving output channel.

[0047] In an optional embodiment of the third aspect, the second driving brightness of the LED lamp beads in the second area is lower than the first driving brightness of the LED lamp beads in the first area, including: When the driving brightness controlled by the second driving output channel is the second driving brightness, the driving brightness controlled by the first driving output channel is determined according to the gradient between the first driving brightness and the second driving brightness.

[0048] According to the above description, the optional embodiment can make the second area as a brightness buffer area, realize uniform brightness drop, and finally make the display light around the effective display area projected by the image source transition softer, and it is difficult to watch the obvious frame boundary line of the virtual image.

[0049] In an optional embodiment of the third aspect, the second driving brightness of the LED lamp beads in the second area is lower than the first driving brightness of the LED lamp beads in the first area, including: The first region comprises a first inner sub-region and a second inner sub-region, and the second region comprises a first outer sub-region close to the first inner sub-region and a second outer sub-region close to the second inner sub-region. In response to the first inner sub-region and the second inner sub-region adopting different first driving brightness, the first outer sub-region and the second outer sub-region adopt different second driving brightness.

[0050] In an optional implementation of the third aspect, the response to the first inner sub-region and the second inner sub-region adopting different first driving brightness, the first outer sub-region and the second outer sub-region adopting different second driving brightness comprises: When the driving brightness of the first inner sub-region is greater than the driving brightness of the second inner sub-region, the driving brightness of the first outer sub-region is greater than the driving brightness of the second outer sub-region.

[0051] In an optional implementation of the third aspect, the first inner sub-region corresponds to an image source effective display region configured to display a navigation mark.

[0052] In an optional implementation of the third aspect, the response to the first inner sub-region and the second inner sub-region adopting different first driving brightness, the first outer sub-region and the second outer sub-region adopting different second driving brightness comprises: The LED lamp beads in the first outer sub-region at least comprise a plurality of LED lamp beads arranged in a first ring and a plurality of LED lamp beads arranged in a second ring, the first ring is closer to the first inner sub-region than the second ring, so that the arrangement level of the LED lamp beads in the first outer sub-region is more complex than the arrangement level of the LED lamp beads in the second outer sub-region. The driving brightness of the plurality of LED lamp beads arranged in the first ring is greater than the driving brightness of the plurality of LED lamp beads arranged in the second ring.

[0053] According to the above description, the optional implementation controls the differentiated brightness transition of the second region according to the differentiated brightness requirement in the first inner sub-region and the second inner sub-region, so as to form different degrees of smooth display distribution.

[0054] In an optional implementation of the third aspect, the second driving brightness of the LED lamp beads in the second region is lower than the first driving brightness of the LED lamp beads in the first region. When the driving brightness of the plurality of LED lamp beads arranged in the second ring is the second driving brightness, the driving brightness of the plurality of LED lamp beads arranged in the first ring is determined according to the gradient between the first driving brightness and the second driving brightness.

[0055] In an optional implementation of the third aspect, the second driving brightness of the LED lamp beads in the second sub-region is directly adopted as the driving brightness of the LED lamp beads in the second sub-region.

[0056] According to the above description, the optional implementation can ensure the transition of eliminating the black frame effect and the integrity of the display of the projection area based on the distribution of the display elements in the first region.

[0057] In an optional implementation of the third aspect, the second driving brightness of the LED lamp beads in the second region is lower than the first driving brightness of the LED lamp beads in the first region, including: In response to the change of the intensity of the ambient light of the vehicle in which the backlight is integrated, the first driving brightness is adjusted, and the second driving brightness is adjusted according to the adjustment of the first driving brightness.

[0058] According to the above description, the optional implementation can adapt to the demand of the illumination light of the entire first region, so that the image source driven has a better transition background display area, thereby having continuity with the change of the environment outside the effective display area and the projection area.

[0059] In a fourth aspect, the present application provides a display device, including a memory, a processor, and a computer program stored in the memory and running on the processor, and the processor implements the steps of the display control method of the third aspect when executing the computer program.

[0060] In a fifth aspect, the present application provides a computer readable storage medium, which stores a computer program, and the computer program implements the steps of the display control method of the third aspect when executed by a processor.

[0061] In a sixth aspect, the present application provides a vehicle, including the backlight of the first aspect, the display device of the second aspect or the display device of the fourth aspect, the computer readable storage medium of the fifth aspect.

[0062] Compared with the prior art, the present application divides the LED lamp panel of the backlight into a first region oppositely arranged with the effective display area of the image source and a second region complementary to the first region, the second region is basically located at the periphery of the first region, and the LED lamp beads are arranged in the first region and the second region respectively, so that the average brightness of the image source provided by the LED lamp beads in the second region is lower than the average brightness of the image source provided by the LED lamp beads in the first region. The present application can alleviate the black frame effect caused by the postcard effect and the fatigue of the user, especially showing a natural transition in the edge region, and optimizing the user experience. BRIEF DESCRIPTION OF DRAWINGS

[0063] In order to more clearly illustrate the technical solutions of the present application, the following will briefly introduce the drawings needed to be used in the description of the technical solutions. Obviously, the drawings described in the following are only some examples described in the present application, and other drawings can also be obtained according to these drawings without creative labor for those skilled in the art.

[0064] Figure 1 The "postcard effect" schematic diagram of the projection area of the HUD display device in the prior art.

[0065] Figure 2 The schematic diagram of the HUD projection display in some examples of the present application.

[0066] Figure 3 The schematic diagram of the HUD display device module in some examples of the present application.

[0067] Figure 4 The schematic diagram of the light machine structure in some examples of the present application.

[0068] Figure 5 The schematic diagram of the backlight source providing illumination light to the image source in some examples of the present application.

[0069] Figure 6 The schematic diagram of the backlight source providing illumination light to the image source in some examples of the present application.

[0070] Figure 7 The schematic diagram of the backlight source partition in some examples of the present application.

[0071] Figure 8 The schematic diagram of the LED lamp bead distribution of the backlight source in some examples of the present application.

[0072] Figure 9 The schematic diagram of the backlight source partition step dimming in some examples of the present application.

[0073] Figure 10 The schematic diagram of the LED lamp bead distribution of the backlight source in some examples of the present application.

[0074] Figure 11 The schematic diagram of the multi-drive output channel light control circuit in some examples of the present application.

[0075] Figure 12 The schematic diagram of the display element distribution of the image source configuration in some examples of the present application.

[0076] Figure 13 The schematic diagram of the LED lamp bead distribution of the backlight source in some examples of the present application.

[0077] Figure 14 The schematic diagram of the HUD display device composition in some examples of the present application.

[0078] Figure 15 To illustrate some examples of the present application, a schematic diagram of a vehicle is shown. DETAILED DESCRIPTION

[0079] The present application will be described in detail below with reference to the drawings, but the description is only some examples described in the present application, and does not limit the present application, and the changes made by those of ordinary skill in the art based on these examples in terms of structure, method or function are included in the protection scope of the present application.

[0080] It should be noted that the same reference numbers or signs can be used in different examples, but these do not represent an absolute relationship between the structure or function. Also, the "first", "second" and the like mentioned in each example are only for the convenience of description, and do not represent an absolute distinction between the structure or function, nor can it be understood as indicating or implying relative importance or the number of corresponding objects. Unless otherwise specified, "at least one" may be referred to in the description, which means one or more, and "a plurality of" means two or more.

[0081] In addition, when indicating a feature, the character " / " can represent the existence of a relationship between the associated objects before and after, for example, head-up display / heads-up display, which can be represented as head-up display or heads-up display. When indicating an operation, the character " / " can represent the existence of a division relationship between the associated objects before and after, for example, magnification M = L / P, which can be represented as L (virtual image size) divided by P (image source size). Also, "and / or" in different examples is only to describe the associated relationship between the associated objects before and after, and this associated relationship can include three cases, for example, concave mirror and / or convex mirror, which can represent the existence of a concave mirror alone, the existence of a convex mirror alone, and the existence of a concave mirror and a convex mirror.

[0082] The HUD projection display mainly uses the principle of optical reflection to reflect the imaging light to be displayed through the transparent surface into the viewer's eye, and the human eye can view the virtual image information along the reverse direction of the light, accordingly, the transparent surface can be the windshield of the vehicle, and the windshield can be used as a display screen to display the navigation indication content of the vehicle, the vehicle speed and the like. For example, Figure 2As shown, the HUD display device can at least include a light engine 1, a first mirror 2, a second mirror 3, etc., wherein the light engine 1 includes a backlight and an image source (not shown in the figure), the backlight is configured to provide illumination light and adjust the brightness of the illumination light according to the control, such as the backlight can be a LED (Light Emitting Diode), a laser, etc. The image source adjusts the corresponding display content according to the control under the illumination light provided by the backlight and projects the display light out from the surface of the image source, such as the image source can be an LCD (Liquid Crystal Display), a DMD (Digital Micromirror Devices), a MEMS (Micro-Electro-Mechanical System) micromirror, an LCOS (Liquid Crystal on Silicon), etc. The first mirror 2 and the second mirror 3 can project the display light projected by the light engine 1 on the windshield 4, realize the light path customization in a smaller space, and meet different projection display requirements, the first mirror 2 and the second mirror 3 can be set as a concave mirror, a convex mirror, a concave lens, a convex lens, etc. according to the needs of optical planning, and the surface type of the lens can adopt a free-form surface. Optionally, at least one of the first mirror 2 and the second mirror 3 can also be adjusted to a certain extent, so as to change the projection position of the display light on the windshield 4, so as to meet the viewers of different heights. The display light of the light engine 1 is finally reflected on the windshield 4 of the vehicle to form a virtual image 5, and the human eye 6 can feel a certain depth when observing the virtual image 5 on the windshield 4, just like observing the real object at a certain distance outside the windshield, and the virtual image 5 can be the navigation indication content, the vehicle speed, etc. as described above. It should be noted that, according to the characteristics of different light engines, the HUD display device can also be provided with a diffuser, and in some examples, the HUD display device can also include a Fresnel lens, a waveguide optical device, a diffractive optical device, a holographic optical device, a tapered optical fiber, etc.

[0083] In some examples, as Figure 3As shown, when the HUD display device of the above example is integrated into a vehicle, it can be started following the start of the vehicle, and the information that needs to be viewed by the traditional in-vehicle central screen can be directly projected in front of the driver's field of view, making information viewing more convenient. Correspondingly, the HUD display device can be powered and data provided by the car machine 92, or the HUD display device itself can provide power and generate data. The HUD display device can specifically include a processor 91, an Ethernet interface 901, a CAN (Controller Area Network) interface 902, a power management module 903, a running memory 904, a storage memory 905, a temperature detection module 906, a motor 907, a backlight 908, an image source 909, a positioning module 910, a radar 911, a camera 912, and the like. It should be noted that, Figure 3 The various modules listed above are merely exemplary descriptions and do not constitute any limitation. In some examples, the HUD display device can also include other modules. In addition, the above modules can be implemented in one or more hardware in different examples, or a single module can be implemented by a combination of multiple hardware.

[0084] The processor 91 serves as the control center of the HUD display device and includes one or more processing units of any type, including but not limited to micro-control units, microcontrollers, DSPs (Digital Signal Processors), or any combination thereof. The processor 91 is configured to generate operation control signals according to computer programs, implement control over other modules, and cooperate with corresponding modules to process data, instructions, etc. obtained or possessed by itself.

[0085] The Ethernet interface 901 is a network data connection port for local area network communication and defines a series of software and hardware standards. Through the Ethernet interface 901, multiple electronic devices can be connected together. In the present example, the processor 91 can interact with the car machine 92 through the Ethernet interface 901, such as sending data to the car machine 92 or receiving data sent by the car machine 92.

[0086] The CAN interface 902 is a network data connection port for controller area network and provides a standard bus for in-vehicle control systems and embedded industrial control to realize communication interaction between nodes. In the present example, the processor 91 can also interact with the car machine 92 through the CAN interface 902. Optionally, the processor 91 can also connect to other external devices through the CAN interface 902. In some examples, the processor 91 can also be provided with a GPIO (General-purpose input / output) interface to improve the compatibility of peripheral device connections.

[0087] The power management module 903 is connected to the car machine 92 and can receive power provided by the car machine 92 to provide stable voltage power supply for various modules of the HUD display device, so as to ensure that the processor 91 and various modules work under normal voltage supply and avoid damage under overvoltage.

[0088] The running memory 904 is used to store computer programs executed by the processor 91, temporarily store operation data, exchange data with the storage memory, and the like. The running memory 904 can be a memory such as SDRAM (Synchronous Dynamic Random-access Memory).

[0089] The storage memory 905 is used to store resources such as related display content of the HUD display device, and long-term storage of running programs and data, and the like. The storage memory 905 can be a memory such as Flash. In some examples, the processor 91 can also provide an interface to access an external memory.

[0090] The temperature detection module 906 is used to detect the temperature inside the HUD display device. Specifically, the temperature detection module 906 can include a plurality of temperature sensors. Since the temperature sensors change in resistance value with temperature, the processor 91 can determine the resistance value of the temperature sensor at the corresponding temperature according to the voltage change between each temperature sensor and the voltage dividing resistor under a fixed power supply voltage, so as to inversely deduce the temperature at the position of the temperature sensor. In some examples, the processor 91 can control the plurality of temperature sensors through a GPIO interface. The plurality of temperature sensors can be arranged at different positions inside the HUD display device. The processor 91 can use a time-sharing detection manner to respectively acquire temperature values fed back by the plurality of temperature sensors.

[0091] The motor 907 is used to drive the optical lens in the HUD display device to rotate under the control of the processor 91, so as to change the corresponding light path. For example, when the sunlight backflow causes temperature rise on the image source surface, the optical lens can be driven by the motor to prevent external sunlight from reaching the image source surface. In some examples, the processor 91 can also drive a fan arranged on the HUD display device through the motor 907 to increase the speed of air exchange inside and outside the HUD display device to achieve heat dissipation. Specifically, the motor 907 is connected to the processor 91 through a motor drive chip. The motor drive chip provides high-performance power output for the motor 907 and can also communicate and control the processor 91 through an SPI (Serial Peripheral Interface) or the like.

[0092] The backlight 908 is used to provide illumination light and adjust the brightness of the illumination light according to the control of the processor 91 to adjust the projection display brightness of the whole HUD display device. The backlight 908 cooperates with the image source 909 to realize the main function of the light-mechanical projection display. Specifically, the backlight 908 is connected with the processor 91 through a backlight driving chip, the backlight driving chip provides a driving voltage for the backlight 908, and controls the brightness of the backlight 908 under the pulse width signal output by the processor 91.

[0093] The image source 909 is used to display images of corresponding contents and project display light corresponding to the images according to the control of the processor 91. Taking the LCD as an example, the image source 909 includes a plurality of liquid crystals corresponding to pixels, the liquid crystals can rotate directions under the control of an electric field, thereby changing the direction of light travel and the color presented. When the illumination light emitted by the backlight 908 reaches the image source 909, the rotation direction of the liquid crystals determines the transmission mode of the illumination light, thereby generating different images, i.e. emitting display light containing different display information.

[0094] The positioning module 910 is used to monitor the position of the HUD display device and the corresponding vehicle. The positioning module 910 can be a global navigation satellite system such as a GPS (Global Positioning System) or a Beidou satellite navigation system. The position and orientation data are determined by measuring the distance between the satellite and the receiver on the positioning module 910 at different positions. In some examples, the positioning module 910 can also include an inertial navigation system. Based on Newton's laws of motion, the acceleration of the positioning module 910 in the inertial reference frame is measured, integrated with respect to time, and transformed into the navigation coordinate system to obtain the velocity, yaw angle and position data in the navigation coordinate system. Optionally, the inertial navigation system can assist the global navigation satellite system to achieve more accurate positioning and provide corresponding position information for the processor 91.

[0095] The radar 911 is used to determine the position of the target object by electromagnetic waves, and the distance of the target object from the vehicle where the radar 911 is located can be determined.

[0096] The camera 912 includes a vehicle body camera and an in-vehicle camera. The vehicle body camera is used to determine the position of the target object through visual recognition. The vehicle body camera can be a monocular camera or a binocular camera. The main difference between the monocular camera and the binocular camera is that the binocular camera can capture images at two different angles, thereby obtaining distance information in three-dimensional space. The in-vehicle camera is used to identify the behavior state of the driver and passengers in the vehicle, including fatigue detection, distraction detection, expression recognition, gesture recognition, gaze tracking, etc. In this example, the in-vehicle camera can also specifically realize eye movement tracking.

[0097] In some examples, the positioning module 910, the radar 911 and the camera 912 can also be directly connected to the vehicle machine 92 without being directly connected to the processor 91 of the HUD display device, such as the vehicle machine 92 itself integrating the positioning module for position tracking and the radar and the camera for automatic driving, and the HUD display device can obtain the acquisition data of the positioning module, the radar and the camera in real time through communication between the vehicle machine 92.

[0098] As shown in Figure 4 The optical engine 1 can specifically include an optical engine frame 101, the upper and lower ends of the optical engine frame 101 are respectively fixed with a backlight 908 and an image source 909, the light emitting surface of the backlight 908 is arranged inside the optical engine frame 101 and faces the incident surface of the image source 909, the illumination light emitted by the backlight 908 reaches the incident surface of the image source 909 through the internal space of the optical engine frame 101, and then the display light is emitted from the light emitting surface of the image source 909 (the surface facing the outside of the optical engine frame 101), the display light has image information projected on the windshield due to the modulation of the image source 909. In some examples, as shown in Figure 5As shown, the backlight 908 supports partition control, such as the array arrangement is divided into three rows horizontally and five columns vertically, and each partition can include a plurality of LED lamp beads distributed equally, which are controlled by independent driving output channels. That is, the backlight 908 can support independent lighting of a specific area or turning off a specific area, or adjusting the brightness of a specific area, and each partition can provide brightness for different partitions on the image source 909, and different display lights can be generated under the action of different brightness illumination lights. In this way, Local Dimming can be supported, which is a technology for improving the contrast of dark scenes by dimming the backlight area, such as generating a backlight brightness driving scheme for different partitions of the backlight 908 according to the distribution of display elements in the image source 909, so that the dark part is darker and the bright part is brighter to improve the contrast. Specifically, the partition-controlled backlight 908 can be implemented by a specific backlight driving chip, which can include a plurality of constant current sink output channels, i.e., driving output channels for controlling the brightness of different partitions, such as each driving output channel has a maximum output current of 50mA and a maximum output voltage of 8V, and each channel supports 8-bit brightness control function to realize PWM dimming. Correspondingly, the partition-lit illumination light reaching the image source 909 also has the function of partition display, and the display light emitted by the image source 909 can have a specific brightness. When the backlight 908 can be partition-controlled, the content displayed on the image source 909 can also be partition-controlled, that is, the specific electric field change of the liquid crystal in a specific area can be controlled by the processor, and different light travel directions and colors can be presented in different areas, and the projected content can also realize more accurate brightness control. In some examples, a lens combination can be arranged between the backlight 908 and the image source 909 to converge and homogenize the illumination light emitted by the backlight 908.

[0099] However, the above-mentioned partition of the backlight 908 is more for Local Dimming, which corresponds to the block arrangement matching in horizontal and vertical directions according to the regular distribution of display elements on the image source, and the equal distribution between blocks facilitates the brightness calculation of Local Diming. However, it ignores the black frame effect of the edge light, which is described with reference to Figure 1The content of the projection area 50 is determined by the distribution of display elements in the image source 909, and the brightness is determined by the backlight source 908 to some extent. Therefore, there are generally two parts in the projection area 50, one is the part with display elements, and the other is the part without display elements. The part without display elements and the environment in front of the vehicle outside the projection area 50 together serve as the background content for the human eye to view the projected display elements. However, due to the difference in projection brightness, the boundary between the two is very obvious, and the viewing effect is that the color tone of the background content is fragmented and not a whole, which affects the viewing experience. The purpose of the present application is to improve the visual effect that the human eye is not affected by the projection part without display elements when viewing the projected display elements. The following will be described in detail.

[0100] As described above, the display light at each position on the image source 909 is guided to the windshield to form a virtual image viewed by the human eye through the optical system of the HUD display device. The optical system can include Figure 1 The first mirror 2 and the second mirror 3 in the optical lens group, specifically, the virtual image formed and the picture distribution between the light emitting surface of the image source 909 are in one-to-one mapping relationship. As Figure 6As shown, the entire light emitting surface of the image source 909 can project display light and finally form an image through the optical system, but the design parameters in the optical system determine that different positions on the light emitting surface of the image source 909 correspond to different image qualities. Generally, the light emitting surface of the image source 909 can be divided into an effective display area 9091 and a background display area 9092. The effective display area 9091 is generally located at the middle of the light emitting surface of the image source 909, and the quality of the image projected by the effective display area 9091 is much higher than that of the background display area 9092. The image projected by the background display area 9092 at the edge position is more likely to be distorted and deteriorated. Therefore, in the design rules of the display elements, it can be required to arrange the display elements required for projection within the effective display area 9091. Accordingly, the background display area 9092 corresponds to the background part in the projection area where there is no display element in the above example, which can be filled with pure black (the image source 909 cannot completely block all light by controlling a specific area to truly present pure black). At the same time, the relative concentration of the display elements can not only improve the overall aesthetics of the projected virtual image, but also facilitate the user to view different information. Accordingly, the developers are further required to concentrate the display elements in the effective display area 9091 in the design rules. It should be noted that the division of the effective display area 9091 and the background display area 9092 is generally determined according to the projection effect of the optical system, but the boundary between the effective display area 9091 and the background display area 9092 is not necessarily absolutely divided according to a rectangular area. In more examples, the distribution style determined in the design rules can be optimized, such as the effective display area 9091 being more concentrated in a trapezoidal, triangular, or more smooth elliptical shape relative to the background display area 9092. The size of the effective display area 9091 can be appropriately enlarged or deformed in addition to the imaging quality trend at different positions according to statistics and the design space reserved for the developers in the design rules. Further, for the image source 909, the effective display area 9091 and the background display area 9092 are not a hardware division concept, but a division range for software design. For example, the liquid crystal control logic of different areas of the LCD is the same, but for the backlight source 908, if the simple block design in the above example is maintained, the brightness of some blocks can be provided to the effective display area 9091 and the background display area 9092. Since the display contents of the two areas are inconsistent, the same brightness will cause the brightness distribution of the image projected by the image source 909 to be unreasonable and lack of transition and hierarchical processing, especially the black frame formed at the edge of the background display area 9092 is not effectively eliminated.

[0101] In some examples, as Figure 7As shown, in order to adapt to the above-mentioned requirement of transition processing of the background display area 9092 to uniformly distribute display elements in the effective display area 9091, the illumination light provided by the LED lamp beads on the backlight 908 is redistributed in hardware and / or software to meet the brightness provision requirements of different areas. In the present example, the LED lamp panel of the backlight 908 is accordingly divided into a first area 9081 and a second area 9082 surrounding the first area 9081, which corresponds to the effective display area 9091 and the background display area 9092 of the image source 909. Alternatively, the first area 9081 and the second area 9082 can be spliced into a completely continuous and uniformly distributed LED lamp bead, i.e., the arrangement rule of the LED lamp bead in different areas can be the same, but the brightness control between the first area 9081 and the second area 9082 is independent of each other. In order to realize that the image picture projected by the background display area can be integrated with the environment in front of the vehicle, the driving brightness of the LED lamp bead in the second area 9082 can be lower than that in the first area 9081. In a specific example, since the illumination light emitted by the LED lamp bead in the first area 9081 is mainly provided in the effective display area 9091 of the image source 909, and the illumination light emitted by the LED lamp bead in the second area 9082 is mainly provided in the background display area 9092 of the image source 909, in order to adapt to the division of the effective display area 9091 and the background display area 9092 in the image source 909, the first area 9081 adopts a rectangular shape (a figure) or an elliptical shape (b figure), and it is arranged opposite to and consistent with the effective display area 9091 of the image source 909 to ensure that at least most of the illumination light emitted by the first area 9081 reaches the effective display area 9091. In a specific example, for a specific distribution of display elements on the image source 909, the shape of the effective display area 9091 can be further redefined according to the accurate block shape composed of display elements, such as a specific asymmetric shape, and the first area 9081 of the backlight 908 also adopts a consistent asymmetric shape. In more examples, when the first area 9081 is arranged opposite to the effective display area 9091, the size range of the two is also completely consistent to ensure complete directness, and the specific size range is as shown in the following table: Figure 4The first area 9081 and the effective display area 9091 can be opened in the proportional range between the backlight 908 and the image source 909. Optionally, according to the actual matching effect, the size difference between the first area 9081 and the effective display area 9091 can be adjusted, for example, the first area 9081 is slightly larger than the effective display area 9091, and correspondingly, part of the first area 9081 is opposite to the effective display area 9091, which can be the middle part of the first area 9081 opposite to the effective display area 9091, and the outer part exceeds the part of the effective display area 9091. For another example, the effective display area 9091 is slightly larger than the first area 9081, and at this time, part of the effective display area 9091 is opposite to the first area. Optionally, the shape of the first area 9081 can also be slightly different from the effective display area 9091, which can be considered in the light path inside the light machine 1 (refer to Figure 4 ) and the limitation of the production and processing of the backlight 908 itself.

[0102] Optionally, the first area 9081 and the second area 9082 can also have different distributed LED lamp beads, which can realize the processing of the uniform transition of brightness by redistributing the lamp beads on the hardware. It should be noted that the division of the first area 9081 and the second area 9082 can refer to Figure 7 Examples, corresponding to the effective display area 9091 and the background display area 9092 on the image source 909. As Figure 8As shown, after the backlight 908 determines the first region 9081 and the second region 9082 according to the active display region 9091 and the background display region 9092 on the image source 909, the backlight 908 further adopts different LED lamp bead distributions in the first region 9081 and the second region 9082 in hardware, which depends on the different roles of the illumination light provided to the active display region 9091 and the background display region 9092. Specifically, in the first region 9081, since the illumination light needs to be provided to the display elements in the active display region 9091, the LED lamp beads in the first region 9081 are distributed in a way of horizontal and vertical alignment, such as the arrangement of three rows and six columns in the figure. Further, the first region can be further divided into blocks, such as one block of one row and two columns, and different blocks support independent brightness control, so that the first region 9081 supports Local Dimming, which can generate different block backlight brightness driving schemes for the image output to the active display region, so as to optimize the contrast of the active display region 9091 of the image source 909. In the second region 9082, since the relatively arranged background display region 9092 is limited by the design rules and does not arrange any display elements, the illumination light provided by the second region 9082 only serves the transition display of the background display region 9092, and ensures the visual coherence between the image picture corresponding to the active display region 9091 and the environment outside the projection region. Accordingly, the LED lamp beads in the second region 9082 are distributed differently from the first region 9081, and are distributed layer by layer from the outer edge of the first region 9081 to the outer edge of the second region 9082. In this example, the second region 9082 is configured to completely surround the first region 9081, so that the first region 9081 is in the middle of the light emitting surface of the backlight 908. Therefore, the layer-by-layer distribution of the LED lamp beads in the second region 9082 is a ring composed of LED lamp beads radiating to the outer edge of the second region 9082 with the first region 9081 as the center. For reference Figure 8In the second area 9082, there is a ring of LED lamp beads, the brightness control of which is inconsistent with that in the first area 9081, for example, not participating in the generation of the Local Dimming backlight brightness driving scheme. Accordingly, the LED lamp beads in the ring can have the same brightness, and the driving brightness is lower than that of the LED lamp beads in the first area 9081, so as to realize the transition of the projection area at the periphery. Even if the projected transparent color cannot be converted from the pure black outer edge display light, the visual boundary feeling can also be reduced by gradually fading to the edge. Alternatively, in order to better realize the transition effect of the gradually decreasing brightness in the second area 9082, a plurality of rings can be arranged from inside to outside, which can specifically include an inner ring close to the first area 9081, a plurality of LED lamp beads arranged according to the first ring, and an outer ring close to the outer edge of the second area 9082, a plurality of LED lamp beads arranged according to the second ring. The first ring and the second ring respectively adopt independent brightness control to realize the gradient brightness in the transition, specifically, the driving brightness of the LED lamp beads in the second ring is lower than that of the LED lamp beads in the first ring, and the brightness of the LED lamp beads in the first ring is lower than that of the LED lamp beads in the first area 9081. Further, more rings of LED lamp bead arrangement can be arranged between the first ring and the second ring, and more refined brightness control can be adopted to increase the level of transition, for example, as shown in Figure 9 When there are a plurality of levels of ring-distributed LED lamp beads in the second area 9082, the illumination light provided can be gradually darkened from inside to outside by independent control and radiation control. When acting on the image source 909, the display light reflected after projection will make the image at the edge of the projection area more integrated with the surrounding environment, and the black frame effect is eliminated. It should be noted that the first ring and the second ring are distributed outwardly around the first area 9081, and the specific arrangement shape of the LED lamp beads can be consistent with the outer contour shape defined by the first area 9081, for example, as shown in Figure 8 The first area 9081 is a rectangle, and the specific shape of the outer ring arrangement is also a rectangle. Alternatively, the shape of the LED lamp bead arrangement can be inconsistent with the outer contour shape defined by the first area 9081, for example, the specific arrangement shape of the first ring and / or the second ring can be fine-tuned according to the actual transition effect. Further, if the first ring and the second ring completely surround the first area 9081, the arrangement of the LED lamp beads can be configured as a closed loop connection with the first end connected to the second end. Alternatively, the first ring and the second ring can also be arranged as a partially open ring, for example, there is a gap in a specific part of the ring and no LED lamp beads are arranged. For details, please refer to the following Figure 13 example, which will be described in detail below.

[0103] In some examples, as shown in Figure 10As shown, the first region 9081 is in the middle of the light emitting surface of the backlight 908 relative to the second region 9082, and the first region 9081 and the second region 9082 are complementary to each other to form the entire light emitting surface of the backlight 908. The outer contour of the first region 9081 is elliptical, and in the second region 9082, there are three annular arrangements of LED lamp beads around the first region 9081, which are represented by squares, pentagons, and hexagons in the figure, respectively. From the inside to the outside, the LED lamp beads in different annular arrangements will be distributed more sparsely, that is, the size of the unit illumination area responsible for by a single LED lamp bead in different annular arrangements is different, and the farther the annular arrangement is from the outside, the larger the unit area responsible for by the LED lamp bead, and the brightness it presents is also weaker. Therefore, the spacing between adjacent LED lamp beads in the same annular arrangement can be consistent, but the farther the annular arrangement is from the outside, the larger the spacing between adjacent LED lamp beads in the same annular arrangement. Further, in order to gradually increase the spacing between adjacent LED lamp beads outward, the number of LED lamp bead arrangements in the outer ring will also be reduced, for example, the number of LED lamp beads arranged according to the first annular arrangement is greater than the number of LED lamp beads arranged according to the second annular arrangement. In addition to ensuring that the brightness in the second region 9082 gradually decreases outward on the hardware, the brightness can also be controlled by directly controlling the LED lamp beads in different annular arrangements, such as Figure 11As shown, when the LEDs in the backlight are driven and controlled, they are independently controlled using different drive output channels, depending on the first and second regions 9081, 9082, and the first and second rings of LEDs in the second region 9082. Specifically, the processor 91 controls the drive brightness of the backlight 908 via the backlight driver chip 918. The backlight driver chip 918 includes several drive output channels OUT1, OUT2, OUT3, and OUT4. Each drive output channel can be connected in series to form a group of LEDs. In this example, the LEDs in the first region 9081 are connected to drive output channel OUT1, the LEDs arranged in the first ring (the inner ring) in the second region 9082 are connected to drive output channel OUT2, the LEDs arranged in the second ring (the outer ring) in the second region 9082 are connected to drive output channel OUT4, and the LEDs arranged in the third ring between the first and second rings are connected to drive output channel OUT3. The backlight driver chip 918 connects to the driver output channels of different groups of LED beads, allowing it to simultaneously output different signals. This allows the LED beads in different groups to be individually turned on or off, and more importantly, to be controlled at different brightness levels. Furthermore, ports DIM1-DIM3, SDA, and SCL of the backlight driver chip 918 are connected to the processor 91, respectively. The processor 91 can send specific backlight control signals to the backlight driver chip 918. In this example, the processor 91 sends dimming signals via ports DIM1-DIM3, which are PWM (Pulse-Width Modulation) dimming input ports. For example, a high input to a specific port causes the corresponding sense resistor and internal register to operate at maximum current in the specific current sink (driver output channel). A low input to a specific port causes the corresponding sense resistor and internal register to disable the specific current sink (driver output channel). The processor 91 can also input data information and clock signals via ports SDA and SCL.

[0104] In a specific example, by Figure 11 Backlight driver chip 918 controls Figure 10When the LED lamp beads in different groups are set, the first driving brightness and the second driving brightness are set, the first driving brightness represents the brightness level required to be provided in the first area 9081, and the second driving brightness represents the brightness level required to be provided in the second area 9082, the first driving brightness is determined in advance according to the required projection effect of the display elements in the effective display area of the image source 909, and the second driving brightness can also be determined in advance according to the first driving brightness, as described above, the second driving brightness is set to be less than the first driving brightness. Optionally, a plurality of different first driving brightnesses and second driving brightnesses corresponding to different first driving brightnesses are also set at the same time to adapt to the light intensity of the environment where the vehicle is located. In actual projection, the corresponding first driving brightness and second driving brightness are called according to the light sensor detection value of the vehicle for adjustment, so that the projected display elements are clearer and are not affected by external light, and the black frame effect of the outer edge will not become obvious due to the change of external light. Correspondingly, for the LED lamp beads in the first area 9081, the first driving brightness can be directly used for control. In the case of fine Local Dimming of the first area 9081, the first driving brightness can be fine-tuned up and down to give different partition brightnesses. When the brightness of the LED lamp beads in the second area 9082 is controlled, if the second area 9082 has only a plurality of LED lamp beads arranged in a first annular arrangement around the first area 9081, the second driving brightness can be used to control the driving brightness of all LED lamp beads in the second area 9082. If the second area 9082 includes a plurality of groups of LED lamp beads arranged in multiple annular arrangements from the inside to the outside, the outermost annular LED lamp beads near the outer edge of the second area 9082 can use the second driving brightness, and the LED lamp beads in other annular arrangements in the second area 9082 can be controlled in gradient according to the following formula: L(n) = L1 + n * (L2 - L1) / N Wherein, L(n) is the driving brightness of the corresponding annular arrangement in the second area 9082, L1 is the first driving brightness, L2 is the second driving brightness, generally L1 is greater than L2, n represents the ordinal number of all annular arrangements in the second area 9082 from the inside to the outside, and N represents the total number of all annular arrangements in the second area 9082. Figure 10 , Figure 11For example, when it is necessary to configure the driving brightness of several LED lamp beads arranged in the first ring in the second area 9082, that is, to configure the parameters of the driving output channel OUT2 of the backlight driver chip 918, it can be obtained by L(1)=70%+1*(20%-70%) / 3=53%, and the parameters of the driving output channels OUT3 and OUT4 are similar. Among them, it is assumed that the first driving brightness is 70% and the second driving brightness is 20%, both of which can be determined and stored by prior calibration. In this example, due to the use of linear decreasing brightness control, the brightness transition level in the second area 9082 is smoother. Further, assuming that the external ambient light intensity detected by the light sensor increases, the first driving brightness called will be adjusted to 90% and the second driving brightness to 40%. At this time, L(1) =90%+1*(40%-90%) / 3=73% will also be adjusted accordingly, and the parameters of the driving output channels OUT3 and OUT4 will also be adjusted accordingly.

[0105] In some examples, such as Figure 12 As shown, the distribution of display elements in the effective display area 9091 in the image source 909 is arranged in modules and blocks. The arrangement rules are relatively fixed and will be reflected in the design rules, which will be used as constraints for subsequent developers to design. For example, the navigation information 9191 will be designed in the upper half of the effective display area 9091, the road indication information 9291 will be designed in the lower left part of the effective display area 9091, and the speed limit information 9391 will be designed in the lower right part of the effective display area 9091. Accordingly, the effective display area 9091 will be further divided into a first display sub-area where the navigation information 9191 is located, a second display sub-area where the road indication information 9291 is located, and a third display sub-area where the speed limit information 9391 is located. In order to meet the different projection requirements of the first display sub-area, the second display sub-area, and the third display sub-area, as shown in FIG. Figure 13 As shown, the first area 9081 on the backlight source 908 also includes a first inner partition 9181, a second inner partition 9281 and a third inner partition 9381. The first inner partition 9181 is arranged relative to the first display sub-area, the second inner partition 9281 is arranged relative to the second display sub-area, and the third inner partition 9381 is arranged relative to the third display sub-area. In this way, the illumination light of different partitions in the first area 9081 is provided to different sub-areas in the effective display area 9091. Optionally, the LED lamp beads in the first area 9081 adopt a uniform arrangement, for example, referring to Figure 8For example, the arrangement rules are consistent in the first inner partition 9181, the second inner partition 9281 or the third inner partition 9381, only different partitions are controlled by different drive output channels alone, while the drive brightness of the first inner partition 9181, the second inner partition 9281 and the third inner partition 9381 can be configured differently, which can be determined according to the projection effect of the navigation information 9191, the road indication information 9291 and the speed limit information 9391 in different positions. In this example, the navigation information 9191 needs higher projection brightness to adapt to the actual virtual-real fitting viewing requirements, so the drive brightness of the first inner partition 9181 can be configured to be higher than that of the second inner partition 9281 and the third inner partition 9381. Alternatively, the arrangement rules of the respective LED lamp beads in the first inner partition 9181, the second inner partition 9281 and the third inner partition 9381 can also be different, which can be adaptively designed according to the distribution characteristics of the display elements in the first display sub-region, the second display sub-region and the third display sub-region, so as to meet the best projection effect.

[0106] Further, in Figure 13In the second area 9082, the first area 9081 is also divided into three sub-areas, i.e., the first outer sub-area 9182 close to the first inner sub-area 9181, the second outer sub-area 9282 close to the second inner sub-area 9281, and the third outer sub-area 9382 close to the third inner sub-area 9381. Accordingly, the driving brightness of the first outer sub-area 9182 is adjusted according to the first inner sub-area 9181 and is lower than the driving brightness of the first inner sub-area 9181, the driving brightness of the second outer sub-area 9282 is adjusted according to the second inner sub-area 9281 and is lower than the driving brightness of the second inner sub-area 9281, and the driving brightness of the third outer sub-area 9382 is adjusted according to the third inner sub-area 9381 and is lower than the driving brightness of the third inner sub-area 9381. Referring to the above example, the adjustment of the driving brightness of the LED lamp beads in the first inner sub-area 9181, the second inner sub-area 9281, and the third inner sub-area 9381 is related to the display elements in the effective display area on the image source and is also adjusted in real time according to the light intensity of the external environment. In this example, since the driving brightness of the first inner sub-area 9181 is configured to be higher than that of the second inner sub-area 9281 and the third inner sub-area 9381, the driving brightness of the first outer sub-area 9182 is also configured to be higher than that of the second outer sub-area 9282 and the third outer sub-area 9382. Further, in order to match the higher driving brightness of the first inner sub-area 9181, more driving output channels are used to control the LED lamp beads in the first outer sub-area 9182, and different driving output channels are connected to the LED lamp beads in different rings from the inside to the outside to meet the smoother transition. In this example, since the second outer sub-area 9282 and the third outer sub-area 9382 only use one ring of LED lamp bead arrangement, and the first outer sub-area 9182 uses two rings of LED lamp bead arrangement, i.e., a plurality of LED lamp beads arranged in a first ring and a plurality of LED lamp beads arranged in a second ring, the first ring is closer to the first inner sub-area 9181 than the second ring, and accordingly, the LED lamp bead arrangement in the first outer sub-area 9182 is inconsistent with that in the second outer sub-area 9282 and the third outer sub-area 9382, so the LED lamp beads between adjacent areas are not connected end to end, and the LED lamp bead arrangement around the first area 9081 in the second area 9082 is an open-loop design. Referring to Figure 10 、 Figure 11 In the first outer sub-area 9182, the driving brightness of the plurality of LED lamp beads arranged in the first ring is greater than that of the plurality of LED lamp beads arranged in the second ring, and the specific driving brightness corresponding to the first ring and the second ring of LED lamp beads can be determined according to the calculation formula in the above example to achieve a smooth gradient decrease from the inside to the outside. For the second outer sub-area 9282 and the third outer sub-area 9382, which only use one ring of arrangement, the driving brightness is directly called from the second driving brightness stored in advance, which will not be described here.

[0107] In some examples, such as Figure 14 As shown, the display device that implements the above-mentioned display control method may specifically include a processor 931, a memory 932, an input device 933 and an output device 934, wherein the input device 933 may include an operation button integrated on the display device, etc., and the display device may receive input control instructions and data through the input device 933. The output device 934 may include an image source integrated on the display device, etc., and the display device may output corresponding instructions or data to the output device 934. Furthermore, the memory 932 stores a computer program running on the processor 931, and when the processor 931 executes the computer program, the display control method of the above example is implemented. In some examples, a computer-readable storage medium stores a computer program, and when the computer program is executed by the processor, the display control method of the above example is implemented.

[0108] like Figure 15 As shown, a vehicle can be equipped with the aforementioned HUD display device. Specifically, the HUD display device is integrated within the center console 10, for example, in front of the steering wheel. The HUD display device projects corresponding display light onto the vehicle's windshield 4 through its projection window 102. Viewers observing the area in front of the windshield 4 from the cockpit directly see a virtual image within the projection area 50. This virtual image includes not only basic information such as vehicle speed but also navigation information aligned with the actual road surface. More importantly, the edges of the projection area 50 transition smoothly, with no noticeable black frame effect. In some examples, the vehicle can also distribute a program for obtaining the display control method described in the aforementioned example via the computer-readable storage medium, enabling convenient updates and upgrades to the vehicle's HUD display device. It should be noted that the aforementioned vehicles are not limited to cars as a means of transportation, but may also include buses, trucks, excavators, motorcycles, trains, high-speed trains, ships, yachts, airplanes, spacecraft, and the like. The windshield to which the projection is directed is not limited to the front windshield of a car and may also be a transparent surface located elsewhere.

[0109] In combination with the above examples, the technical solutions involved in the present application can be directly embodied as hardware, software modules executed by a control unit, or a combination of both, i.e., one or more steps and / or one or more combinations of steps, which can correspond to individual software modules of a computer program flow, or to individual hardware modules, such as ASIC (Application Specific Integrated Circuit), FPGA (Field-Programmable Gate Array) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any appropriate combination thereof. For the purpose of description, the above description is divided into various modules and described respectively in terms of functions, and of course, the functions of the modules can be implemented in one or more software and / or hardware in the implementation of the present application.

[0110] Through the description of the above examples, those skilled in the art can clearly understand that the present application can be implemented by means of software and the necessary general hardware platform. Based on such understanding, the technical solutions involved in the present application can be embodied in the form of a software product. The software is executed by a micro-control unit, which can include one or more micro-control units of any type, including but not limited to micro-control units, micro-controllers, DSPs (Digital Signal Processors) or any combination thereof, depending on the required configuration. The software is stored in a memory, such as a volatile memory (e.g., random access memory, etc.), a non-volatile memory (e.g., read-only memory, flash memory, etc.) or any combination thereof.

[0111] In summary, the present application divides the LED lamp plate of the backlight source into a first region oppositely arranged with the effective display region of the image source and a second region complementary to the first region, the second region is basically located at the periphery of the first region, and LED lamp beads are arranged in the first region and the second region respectively, so that the average brightness of the LED lamp beads in the second region provided to the image source is lower than the average brightness of the LED lamp beads in the first region provided to the image source. The present application can alleviate the black frame effect and the fatigue of users caused by the postcard effect, especially showing a natural transition in the edge region, and optimizing the user experience.

[0112] It should be understood that although the present specification includes some examples, any one of the examples does not contain only one independent technical solution, and the description of the specification is only for the purpose of clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each example can be appropriately combined to form other embodiments that those skilled in the art can understand.

[0113] The above detailed description set forth above in connection with the appended drawings is merely descriptive of the best mode contemplated for carrying out the application. It is submitted with the understanding that the application will not be limited to just the details of the embodiments described, since these details are subject to modification in light of available information, or changes in design or circumstances. Therefore, this application is deemed to cover all alternatives, modifications and equivalents falling within the scope of the following claims.

Claims

1. A backlight source for providing illumination light for an image source, characterized in that: The backlight source comprises: An LED light board, the LED light board comprising a first area and a second area, the first area being arranged opposite to an effective display area of ​​the image source, and the second area being arranged at least partially around the first area; A plurality of LED lamp beads are arranged on the LED lamp board, wherein the LED lamp beads are arranged in the first area according to a first distribution, and the LED lamp beads are arranged in the second area according to a second distribution.

2. The backlight source according to claim 1, wherein: The LED lamp beads are arranged in the first area according to a first distribution, and the LED lamp beads are arranged in the second area according to a second distribution, including: The distance between adjacent LED lamp beads in the first area is smaller than the distance between adjacent LED lamp beads in the second area.

3. The backlight source according to claim 1, wherein: Arranging the LED lamp beads in the second area according to the second distribution includes: The second distribution adopts a circular arrangement radiating outward from the first area as the center, and the LED lamp beads in the second area include at least a number of LED lamp beads arranged according to the first circular arrangement and a number of LED lamp beads arranged according to the second circular arrangement. The first circular arrangement is closer to the first area than the second circular arrangement.

4. A display control method, characterized in that: include: The backlight source is matched with the display of the image source and is divided into a first area and a second area on the LED light panel, wherein the first area is arranged opposite to the effective display area of ​​the image source, and the second area is arranged at least partially around the first area; The second driving brightness of the LED lamp beads in the second area is lower than the first driving brightness of the LED lamp beads in the first area.

5. The display control method according to claim 4, characterized in that: The second driving brightness of the LED lamp beads in the second area is lower than the first driving brightness of the LED lamp beads in the first area, which includes: A first drive output channel and a second drive output channel for controlling different drive brightnesses, wherein the first drive output channel is responsible for controlling LED lamp beads in a first annular arrangement in the second area close to the first area, and the second drive output channel is responsible for controlling LED lamp beads in a second annular arrangement in the second area far from the first area; The driving brightness controlled by the second driving output channel is lower than the driving brightness controlled by the first driving output channel.

6. The display control method according to claim 5, characterized in that: The second driving brightness of the LED lamp beads in the second area is lower than the first driving brightness of the LED lamp beads in the first area, which includes: When the driving brightness controlled by the second driving output channel is the second driving brightness, the driving brightness controlled by the first driving output channel is determined according to a gradient between the first driving brightness and the second driving brightness.

7. The display control method according to claim 4, wherein: The second driving brightness of the LED lamp beads in the second area is lower than the first driving brightness of the LED lamp beads in the first area, which includes: In response to a change in the intensity of ambient light in a vehicle in which the backlight source is integrated, the first driving brightness is adjusted, and the second driving brightness is adjusted according to the adjustment of the first driving brightness.

8. A display device, characterized in that: The display control method comprises a memory, a processor and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of the display control method according to any one of claims 4 to 7 when executing the computer program.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the display control method according to any one of claims 4 to 7 are implemented.

10. A means of transport, characterized in that: The device comprises the backlight source according to any one of claims 1 to 3, the display device according to claim 8, or the computer-readable storage medium according to claim 9.

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