Display device, head-up display and vehicle

Abstract

The embodiment of the invention provides a display device, a head-up display and a vehicle, the display device is applied to the head-up display, the display device emits image light, and the image light is reflected into an eye box through an imaging window corresponding to the head-up display, so that a user can observe a virtual image formed by the image light. The curvature of the imaging window in at least one of the transverse direction and the longitudinal direction is larger than 0 so as to form a first distortion form, the display device comprises a liquid crystal display screen and a backlight module, the backlight module is installed on the back side of the liquid crystal display screen and used for providing backlight for the liquid crystal display screen so that the liquid crystal display screen can emit image light, and the backlight module comprises a plurality of backlight lamps; the brightness of at least one of the plurality of backlights can be independently adjusted according to the virtual image content of the virtual image, the curvature of the shape formed by arranging the plurality of backlights in at least one of the transverse direction and the longitudinal direction of the liquid crystal display screen is greater than 0, and the bending direction of the shape is opposite to the bending direction of the corresponding area in the imaging window.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a display device, a head-up display, and a vehicle. Background Art

[0002] HUD (head up display) is also called a head-up display. By projecting the light emitted by the HUD image source onto an imaging window (such as a rear-mounted imaging board or a windshield of a vehicle, etc.), the user can directly see the image without lowering or turning his head. This can avoid distraction caused by the driver lowering his head to look at the dashboard during driving, improve driving safety, and also improve the user's driving experience.

[0003] After research and testing, the inventors found that HUD faces problems of insufficient reliability and low service life during operation. For example, in the virtual image formed by the HUD, the contrast between the virtual image content part and the non-virtual image content part is low, and the display effect is reduced; for another example, the liquid crystal display of the HUD is easily damaged due to excessive temperature during use, resulting in reduced HUD display effect or unusability; in addition, the HUD may also have insufficient brightness, or in order to meet the brightness requirements, it will cause excessive power consumption, further causing the internal temperature of the HUD to be too high, and damage the liquid crystal display. Summary of the invention

[0004] The purpose of the embodiments of the present disclosure is to provide a display device, a head-up display and a vehicle to solve the technical problems of insufficient reliability and short service life of the head-up display in the prior art.

[0005] In order to solve the above technical problems, the embodiments of the present disclosure adopt the following technical solutions:

[0006] The embodiment of the present disclosure provides a display device, which is applied to a head-up display. The display device emits image light, which is reflected into an eye box through an imaging window corresponding to the head-up display, so that a user can observe a virtual image formed by the image light. The curvature of at least one of the horizontal and vertical directions of the imaging window is greater than 0 to form a first distortion form. The display device includes:

[0007] LCD display;

[0008] A backlight module is installed on the back side of the liquid crystal display screen, and is used to provide backlight for the liquid crystal display screen so that the liquid crystal display screen emits the image light. The backlight module includes a plurality of backlight lamps, and the brightness of at least one of the plurality of backlight lamps can be independently adjusted according to the virtual image content of the virtual image. The plurality of backlight lamps are arranged in a shape whose curvature in at least one of the horizontal and vertical directions of the liquid crystal display screen is greater than 0, and the curvature direction of the shape is opposite to the curvature direction of the corresponding area in the imaging window.

[0009] In some embodiments, the plurality of backlights are arranged in an array, and the plurality of backlights arranged transversely are arranged in a non-linear manner to correspond to the curved transverse shape of the corresponding area in the imaging window.

[0010] In some embodiments, a plurality of the backlights are arranged in partitions, and the plurality of the backlights in each partition area are arranged in an array or staggered, and the arrangement of the backlights in at least two of the partition areas is different and / or the sizes of the lamp beads of the backlights are different, wherein the arrangement of the backlights in the partition areas includes at least one of the arrangement density of the backlights, the spacing between two adjacent rows or two adjacent columns in a queue in which the backlights are arranged, and the positional relationship of the arrangement of the backlights.

[0011] In some embodiments, the arrangement of the backlights in at least one of the partitioned areas is determined according to at least one of the number of virtual image logos in the virtual image formed by the head-up display, display granularity, display duration, and display frequency.

[0012] In some embodiments, at least two backlights among the plurality of backlights are closely packed, or at least two backlights among the plurality of backlights are not closely packed.

[0013] In some embodiments, the backlight module also includes a backlight circuit board, and the multiple backlight lamps are installed on the backlight circuit board and are respectively connected to the backlight circuit board to control the opening and closing and / or brightness of the corresponding backlight lamps according to the virtual image content of the virtual image.

[0014] In some embodiments, the head-up display is an AR head-up display, which includes at least two display devices, each of which emits different image light to form different virtual images, and the arrangement of backlights corresponding to at least two of the display devices is different and / or the size of the backlight beads is different.

[0015] In some embodiments, a plurality of said backlights are arranged according to a transmission relationship between said virtual image and said eye box.

[0016] An embodiment of the present disclosure further provides a head-up display, comprising an imaging window and the above-mentioned display device.

[0017] In some embodiments, the head-up display also includes a controller, which is connected to the display device, and the controller is configured to adjust the identification parameters of the corresponding virtual image logo according to the lit backlight so that the virtual image logo is displayed within a preset backlight range, wherein the identification parameters include at least one of the size, spacing and displacement of the virtual image logo.

[0018] In some embodiments, the controller is configured to determine whether the spanning area of ​​the virtual image logo corresponding to the lit backlight is less than a preset area threshold, and if so, adjust the identification parameters of the virtual image logo, wherein the spanning area is the area of ​​the main backlight in at least two backlights when the virtual image logo spans at least two backlights, or the spanning area is the area of ​​the main partition area in at least two partition areas when the virtual image logo spans at least two partition areas.

[0019] The disclosed embodiment also provides a means of transportation, comprising the above-mentioned head-up display.

[0020] The display device, head-up display and vehicle provided by the embodiments of the present disclosure set the brightness of at least one of the multiple backlights of the backlight module to be independently adjustable according to the virtual image content of the virtual image, and the curvature of the shape formed by the multiple backlights in at least one of the horizontal and vertical directions of the liquid crystal display screen is greater than 0, and the bending direction of the shape formed by the multiple backlights is opposite to the bending direction of the corresponding area in the imaging window to adapt to the curvature of the imaging window. While improving the display effect of the head-up display, it can reduce the computing power consumption of the head-up display, improve the working reliability of the head-up display, and increase the service life of the head-up display. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 A schematic diagram of the structure of a display device according to an embodiment of the present disclosure

[0023] Figure 2 is a schematic structural diagram of a backlight of a display device according to an embodiment of the present disclosure;

[0024] Figure 3 It is a schematic structural diagram of a backlight and an imaging window of a display device according to an embodiment of the present disclosure;

[0025] Figure 4 is a working schematic diagram of a display device according to an embodiment of the present disclosure;

[0026] Figure 5 is another working schematic diagram of the display device according to an embodiment of the present disclosure;

[0027] Figure 6 A schematic diagram of the partition arrangement of the backlight according to an embodiment of the present disclosure;

[0028] Figure 7 is a schematic diagram of the arrangement of backlights when there are two display devices in an embodiment of the present disclosure;

[0029] Figure 8 The figure is a schematic diagram of the coordination of the backlight and the virtual image logo according to the embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] Various aspects and features of the present disclosure are described herein with reference to the drawings.

[0031] It should be understood that various modifications may be made to the embodiments of the present application. Therefore, the above description should not be considered as limiting, but only as an example of an embodiment. Other modifications within the scope and spirit of the present disclosure will occur to those skilled in the art.

[0032] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the general description of the present disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the present disclosure.

[0033] These and other characteristics of the present disclosure will become apparent from the following description of a preferred form of embodiment given as a non-limiting example, with reference to the attached drawings.

[0034] It should also be understood that, although the present disclosure has been described with reference to some specific examples, those skilled in the art will be able to realize many other equivalent forms of the present disclosure that have the features described in the claims and are therefore within the scope of protection defined thereby.

[0035] The above and other aspects, features and advantages of the present disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0036] Specific embodiments of the present disclosure are described hereinafter with reference to the accompanying drawings; however, it should be understood that the embodiments claimed are merely examples of the present disclosure, which may be implemented in a variety of ways. Well-known and / or repeated functions and structures are not described in detail to avoid obscuring the present disclosure with unnecessary or redundant details. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely serve as a basis and representative basis for the claims to teach those skilled in the art to use the present disclosure in a variety of ways with substantially any suitable detailed structure.

[0037] This specification may use the phrases "in one embodiment," "in another embodiment," "in a further embodiment," or "in other embodiments," all of which may refer to one or more of the same or different embodiments according to the present disclosure.

[0038] Figure 1 A schematic diagram showing the structure of a display device according to an embodiment of the present disclosure is shown. Figure 2 A schematic diagram showing the structure of a backlight of a display device according to an embodiment of the present disclosure is shown; Figure 3 A schematic diagram showing the structure of a backlight and an imaging window of a display device according to an embodiment of the present disclosure is shown; Figure 4 FIG. 2 shows a working schematic diagram of a display device according to an embodiment of the present disclosure. Figures 1 to 4 As shown, an embodiment of the present disclosure provides a display device, which is applied to a head-up display 100. The display device emits image light, and the image light is reflected into an eye box 300 through an imaging window 200 (such as a windshield) corresponding to the head-up display 100, so that a user can observe a virtual image 400 formed by the image light. The curvature of the imaging window 200 in at least one of the horizontal and vertical directions is greater than 0 to form a first distortion shape. The display device includes a liquid crystal display screen 1 and a backlight module 2.

[0039] The backlight module 2 is installed on the back side of the liquid crystal display screen 1, and is used to provide backlight for the liquid crystal display screen 1 so that the liquid crystal display screen 1 emits image light. The backlight module 2 includes multiple backlight lamps 21. The brightness of at least one backlight lamp 21 among the multiple backlight lamps 21 can be independently adjusted according to the virtual image content of the virtual image 400. The curvature of the shape formed by the multiple backlight lamps 21 in at least one of the horizontal and vertical directions of the liquid crystal display screen 1 is greater than 0, and the bending direction of the shape formed by the multiple backlight lamps 21 is opposite to the bending direction of the corresponding area in the imaging window 200.

[0040] The display device can be used as the image source 10 of the head-up display 100. The image light emitted by the liquid crystal display screen 1 in the image source 10 is reflected to the eye box 300 through the imaging window 200, so that the user's eyes can see the virtual image 400 when they are in the eye box 300. The eye box 300 refers to the area where the observer's eyes can observe the virtual image 400 formed by the head-up display 100 at different positions in the eye box 300.

[0041] In this embodiment, in order to enable the user to see a larger virtual image 400, an amplifying component 20 is provided between the image source 10 and the imaging window 200, for amplifying the image output by the image source 10. In some examples, the amplifying component 20 may include a plane reflector 201 and a curved mirror 202. In other examples, the amplifying component 20 may include an HOE amplifying element provided on the imaging window 200, which is not limited thereto.

[0042] In this embodiment, Figure 2 and Figure 3 As shown, the curvature of at least one of the horizontal and vertical directions of the imaging window 200 is greater than 0 to form a first distorted form. In order to adapt to the first distorted form, multiple backlights 21 are distortedly arranged based on the curvature of the first distorted form of the imaging window 200, and the bending direction of the shape formed by the arrangement of the multiple backlights 21 is opposite to the bending direction of the corresponding area in the imaging window 200, so that the curvature of the arranged backlights 21 is adapted to the curvature of the imaging window 20 (this adaptation can be understood as that the curvature of the shape is the same as the curvature of the area in the imaging window 200 where the image light is incident, but the bending direction is opposite, and the same curvature should be understood as the same with errors, and is not required to be strictly the same).

[0043] Since the imaging window 200 has a curvature, it will cause the image generated by the image source 10 to be distorted. In order to make the virtual image 400 seen by the observer normal, the image displayed by the image source 10 will be distorted. For example, if a straight line needs to be displayed in the virtual image 400, the image source 10 needs to display a distorted curve.

[0044] At least one of the multiple backlights 21 is set to a structure in which the brightness can be independently adjusted according to the virtual image content of the virtual image 400 (the backlight module 2 is a local control structure). Based on the multiple backlights 21 arranged in a distorted manner, the brightness of at least some of the multiple backlights 21 can be independently adjusted and controlled, which can effectively reduce the computing power consumption when controlling the backlight 21.

[0045] Specifically, because the backlight 21 can be controlled independently, it is necessary to calculate and determine the backlight 21 to be turned on or off based on the virtual image content (specifically, the virtual image identifier corresponding to the virtual image content, also known as UI). In the prior art, the calculation complexity of the backlight 21 in the undistorted arrangement is relatively high. For example, some UIs need to occupy a larger number of backlights 21, while the backlights 21 after the distorted arrangement do not need to occupy a larger number of backlights 21, which greatly reduces the calculation complexity of the backlight 21, thereby reducing the computing power consumption of the backlight 21 control and improving the convenience of backlight 21 control. The total number of backlights 21 after the distorted arrangement is reduced relative to the total number of backlights 21 in the undistorted arrangement, which can not only reduce the computing power consumption, but also reduce the storage (memory) consumption corresponding to the controller of the backlight 21. Moreover, the backlights 21 of this structure can reduce the overall number, thereby reducing production and manufacturing costs.

[0046] The inventor has found that the heat sources on the LCD screen 1 are mainly three parts. The first is the heat in the environment transferred to the LCD screen 1. The second is the heat generated when the backlight 21 is turned on and transferred to the LCD screen 1. The third is the heat from the sunlight irradiating the LCD screen 1 when sunlight backflow occurs. Since the maximum amount of heat that the LCD screen 1 can withstand is limited, by reducing the heat transferred from the backlight 21 to the LCD screen 1, a larger margin can be reserved for sunlight backflow, thereby reducing the risk of damage to the LCD screen 1 due to sunlight backflow, effectively avoiding screen burn-in, and increasing the service life of the LCD screen 1.

[0047] In the present embodiment, the arrangement of the backlights 21 is distorted based on the curvature of the imaging window 200, so that when the virtual image content after distortion correction is displayed, the number of backlights 21 after the distorted arrangement occupied by the same size of UI is less than the number of backlights 21 after the undistorted arrangement. In this way, while meeting the brightness requirements of each virtual image content in the virtual image 400, energy consumption can be saved, thereby reducing the heat transferred to the liquid crystal display screen 1, which helps to protect the liquid crystal display screen 1 and prevent the liquid crystal display screen 1 from being damaged due to excessive temperature.

[0048] It can be understood that the brightness of at least one backlight 21 among the above-mentioned multiple backlights 21 can be independently adjusted according to the virtual image content of the virtual image 400, including at least one backlight 21 can be independently turned on or off according to the virtual image content (the brightness is 0 when turned off), and / or the brightness value of the turned-on backlight 21 can be adjusted.

[0049] The display device provided by the embodiment of the present disclosure sets the brightness of at least one of the multiple backlights 21 of the backlight module 2 to be independently adjustable according to the virtual image content of the virtual image 400. The multiple backlights 21 are arranged in a shape whose curvature in at least one of the horizontal and vertical directions of the liquid crystal display screen 1 is greater than 0, and the bending direction of the shape of the multiple backlights 21 is opposite to the bending direction of the corresponding area in the imaging window 200 so as to adapt to the curvature of the imaging window 200. While improving the display effect of the head-up display 100, it can reduce the computing power consumption of the head-up display 100, improve the working reliability of the head-up display 100, and increase the service life of the head-up display 100.

[0050] In some embodiments, Figure 2 and Figure 3 As shown, the plurality of backlights 21 are arranged in an array, and the plurality of backlights 21 arranged transversely are arranged in a non-linear manner to correspond to the curved transverse shape of the corresponding area in the imaging window 200 .

[0051] A plurality of backlights 21 may form a backlight array, wherein at least one row ( Figure 3 and Figure 3 The horizontal direction) can be a non-linear shape, corresponding to the curved horizontal shape of the corresponding area in the imaging window 200, so that the backlights 21 arranged in a horizontal non-linear array can be used to correct the first distortion form of the laterally curved imaging window 200 to ensure the display effect of the virtual image 400; at the same time, the multiple backlights 21 arranged in a non-linear array can reduce the total number of backlights 21 arranged in the backlight module 2, and under the same UI, the number of occupied and lit backlights 21 can be reduced, thereby reducing the power consumption of the head-up display 100.

[0052] In some embodiments, Figure 6 As shown, multiple backlights 21 are arranged in partitions, and the multiple backlights 21 in each partition area are arranged in an array or staggered, and the arrangement of the backlights 21 in at least two partition areas is different and / or the sizes of the lamp beads of the backlights 21 are different, wherein the arrangement of the backlights 21 in the partition areas includes at least one of the arrangement density of the backlights 21, the spacing between two adjacent rows or two adjacent columns in the queue of the backlights 21, and the positional relationship of the arrangement of the backlights 21.

[0053] By arranging the backlight 21 in different zones, the requirements of display fineness, brightness uniformity and contrast of different zones can be met. At the same time, by setting the arrangement of the backlight 21 in at least two zone areas and the size of the lamp beads of the backlight 21 to be different, the backlight 21 can be adjusted in a personalized and diversified manner according to the virtual image content, meeting the display effect requirements of different virtual image contents.

[0054] The arrangement density of the backlights 21 refers to the number of backlights 21 per unit area, for example, it can be expressed as the spacing between two adjacent backlights 21. The positional relationship of the arrangement of the backlights 21 includes the relative position (for example, up, down, left, right, straight or oblique) and spacing between any two backlights 21, and information related to the arrangement position.

[0055] In a specific example, if Figure 6 As shown, in this embodiment, the multiple backlights 21 arranged in partitions are divided into 5 partition areas, among which the partition area 2 is arranged in an array of multiple rows and columns, the partition area 5 is arranged in a single column, and each row or column in the partition area 1, the partition area 2, and the partition area 4 is arranged in an array, and the adjacent rows or columns are arranged in a staggered manner. The arrangement density of the backlights 21 in the partition area 1 and the partition area 2 is relatively large, and the size of the lamp beads is relatively small (the lamp beads can be small lamp beads at the pixel level), so as to ensure that the display effect of the virtual image content is uniform and delicate. The backlights 21 in each row of the partition area 1 are arranged in a single row, and the backlights 21 in two adjacent rows are arranged in a staggered manner, which can improve the contrast of the virtual image content and facilitate users to see clearly; the partition area 2 is arranged in an array of multiple rows and columns, which can ensure the uniformity of the backlight in this area. The arrangement density of the backlights 21 in partition area 3 to partition area 5 is relatively small and the size of the lamp beads is relatively large. Each column of backlights 21 in partition area 3 is arranged in a single row, and the backlights 21 in two adjacent columns are staggered; each row of backlights 21 in partition area 4 is arranged in a single row, and the backlights 21 in two adjacent rows are staggered; the backlights 21 in partition area 5 are arranged in a single row.

[0056] For another example, when the virtual image 400 contains a lot of complex virtual image contents, the size of the backlight 21 beads in the corresponding partitioned area can be set smaller to control each virtual image content as accurately as possible; and when the virtual image content is sparse, the size of the backlight 21 beads in the corresponding partitioned area can be set larger to ensure the uniformity of the backlight and the display uniformity of the virtual image content.

[0057] In some embodiments, the arrangement of the backlights 21 in at least one partitioned area is determined according to at least one of the number of virtual image logos in the virtual image 400 formed by the head-up display 100 , display granularity, display duration, and display frequency.

[0058] The display granularity includes the size of the virtual image logo, the spacing between two adjacent virtual image logos, the row spacing, the column spacing, etc.

[0059] For example, the above five partition areas are determined according to the display frequency of the virtual image logo, that is, according to the usage frequency of the backlight 21. Among them, partition area 1 and partition area 2 are areas where the backlight 21 is used more frequently, and can display permanent information such as vehicle speed and battery level. The remaining partition areas 3 to 5 are used less frequently.

[0060] The brightness of the backlights 21 in the partitioned areas can be controlled together to achieve linkage control of the backlights 21 in the partitioned areas and ensure the uniformity of the backlight; each backlight 21 in the partitioned areas can also be controlled independently, and the present disclosure does not limit this. For example, for a partitioned area where the virtual image logo is relatively fine or the display frequency is relatively high, the backlights 21 in the partitioned area can be controlled individually, while the lights in other areas can be grouped for linkage control or independent control according to the display granularity. In this embodiment, the backlights 21 are controlled according to the partitioned areas, which can reduce power consumption and reduce the heat transferred to the liquid crystal display screen 1 while ensuring the brightness requirements, and at the same time can ensure the display effect of the virtual image content.

[0061] It can be understood that in this embodiment, the backlights 21 can be controlled in a linked manner or independently according to the above-mentioned partitioned areas, and the backlights 21 in the entire backlight module 2 can be controlled in a linked manner or individually. For example, for multiple backlights 21 that are not partitioned, at least two of them can be grouped together for linked control.

[0062] Optionally, in this embodiment, the arrangement of the backlights 21 in at least one partition area may be determined according to the degree of inclination of the virtual image logo. For example, when the virtual image logo is an inclined logo, the number of lamp beads of the backlights 21 in the partition area corresponding to the virtual image logo may be set to be smaller, that is, the arrangement density of the backlights 21 may be set to be larger, so as to ensure the backlight uniformity of the inclined virtual image logo.

[0063] In some embodiments, at least two backlights 21 among the plurality of backlights 21 are closely packed together, or at least two backlights 21 among the plurality of backlights 21 are not closely packed together.

[0064] Among them, dense stacking means that the distance between two adjacent backlights 21 is less than a first set value, and the first set value can be 1mm, or 5mm, or the first set value can also be micron level, such as 1 micron, 10 microns, 100 microns, 200 microns, 500 microns, etc.; or, the first set value is 50% of the size of the lamp beads of the backlight 21. Non-dense stacking means that the distance between two adjacent backlights 21 is greater than or equal to the first set value. In order to ensure that the display effect of the virtual image content is uniform and delicate, at least two backlights 21 among the multiple backlights 21 can be densely stacked; for relatively sparse virtual image content, at least two backlights 21 among the multiple backlights 21 can be non-densely stacked to reduce the total number of backlights 21 and reduce power consumption.

[0065] For a virtual image logo with a fixed display position or display area, the arrangement of the backlight 21 and the arrangement density of the backlight 21 can be determined in advance for the virtual image logo, so as to meet the quality requirements of the display of the virtual image 400 and facilitate the control of the backlight 21.

[0066] In some embodiments, Figure 1 As shown, the backlight module 2 also includes a backlight circuit board 22 , and a plurality of backlight lamps 21 are mounted on the backlight circuit board 22 and respectively connected to the backlight circuit board 22 to control the opening and closing and / or brightness of the corresponding backlight lamps 21 according to the virtual image content of the virtual image 400 .

[0067] The backlight 21 is fixedly mounted on the backlight circuit board 22, and then the backlight circuit board 22 is mounted on the back side of the liquid crystal display screen 1, which is convenient for the installation of the backlight 21. Moreover, according to the virtual image content of the virtual image 400, different conductive contacts on the backlight circuit board 22 can be used to realize independent control of at least one backlight 21. When part of the backlight 21 is damaged, the backlight circuit board 22 can be disassembled and the required backlight 21 can be replaced, which is convenient for disassembly, assembly and maintenance.

[0068] In some embodiments, Figure 1 As shown, the display device further includes a collimating structure 3 , which is disposed between the liquid crystal display screen 1 and the backlight module 2 . The collimating structure 3 includes a plurality of collimating lamp cups, and the collimating lamp cups correspond to the backlight lamps 21 one by one.

[0069] Since the backlight emitted by the backlight 21 is usually divergent, and the light intensity will gradually decay outward with the backlight 21 as the center, in order to ensure the uniformity of the backlight, a collimation structure 3 is set between the backlight module 2 and the liquid crystal display screen 1, and the collimation structure 3 includes a plurality of collimation lamp cups, and the collimation lamp cups correspond one-to-one to the backlight 21. The backlight emitted by the backlight 21 can be collimated to avoid or reduce the diffusion of the backlight emitted by one or some backlights 21 to the corresponding areas of other backlights 21. On the one hand, it can reduce the waste of backlight, thereby reducing power consumption while ensuring brightness. On the other hand, it can effectively improve the display contrast of virtual image content.

[0070] In some embodiments, Figure 5 As shown, the head-up display 100 is an AR head-up display, which includes at least two display devices, each display device emits different image light to form a different virtual image 400, and the arrangement of the backlights 21 corresponding to at least two display devices is different and / or the size of the lamp beads of the backlights 21 is different.

[0071] like Figure 5As shown, in the AR head-up display, the image light emitted by different image sources is reflected into the eye box 300 through the imaging window 200 to form different virtual images. The first image light emitted by the first display device 101 is reflected into the eye box 300 through the imaging window 200 to form a first virtual image 401, and the second image light emitted by the second display device 102 is reflected into the eye box 300 through the imaging window 200 to form a second virtual image 402. The first virtual image 401 is a near-layer virtual image screen, and the second virtual image 402 is a far-layer virtual image screen. The first virtual image 401 is close to the eye box 300 and can display instrument information that is not related to the external environment of the vehicle, such as displaying vehicle speed, power (or oil), external temperature, and vehicle status (such as braking, steering) or other functional identification. The second virtual image 402 can display virtual image content that is integrated with the real road environment, such as the front vehicle lock mark, vehicle safety reminder mark, POI (such as building mark), etc., to timely remind the user to pay attention to relevant road information and ensure driving safety.

[0072] For the AR head-up display, in order to better adapt to the display requirements such as the category and display position of the virtual image logos of different virtual images 400 in the near and far layers, the arrangement of the backlights 21 of different image sources 10 can be set according to different virtual images 400 to improve the display effect of each layer of virtual images.

[0073] For example, Figure 7 As shown, in the second virtual image 402 of the far layer, the backlight area 1 corresponding to the lane line can be arranged with a plurality of first backlights arranged obliquely, and in the first virtual image 401 of the near layer, the backlight area 2 for displaying instrument information can be arranged with a plurality of second backlights arranged obliquely, wherein the plurality of first backlights and the plurality of second backlights are arranged in an array.

[0074] It is understandable that the arrangement of the backlights 21 corresponding to at least two display devices is different and / or the determination of the size of the lamp beads of the backlights 21 can refer to the arrangement of the backlights 21 and / or the determination of the size of the lamp beads of the backlights 21 in the above-mentioned single display device, and will not be repeated here.

[0075] In the first virtual image 401 of the near layer, not only virtual image content unrelated to the external environment of the vehicle can be displayed, but also virtual image content related to the external environment of the vehicle can be displayed, so as to realize the fusion display of virtual image and real scene and improve the user's HUD experience; in the second virtual image 402 of the far layer, virtual image content unrelated to the external environment of the vehicle can also be displayed, and the present disclosure does not impose any restrictions on this.

[0076] In some embodiments, the plurality of backlights 21 are arranged according to a transmission relationship between the virtual image 400 and the eye box 300 .

[0077] For the second display device 402 used to form a distant virtual image, since the virtual image content displayed by it is imaged at a longer distance, the arrangement of the backlight lamps 21 of the second display device 402 can be adjusted based on the transmission relationship between the virtual image 400 and the eye box 300. For example, based on the distance and relative height difference between the virtual image 400 and the eye box 300, the transmission relationship between the two is determined, and then the rotation angle of the backlight lamps 21 is determined according to the perspective relationship, and the backlight lamps 21 are rotated to a corresponding position at the rotation angle, so that the backlight lamps 21 are arranged tilted in the longitudinal direction (such as Figure 7 As shown), the transmission relationship is satisfied, thereby further improving the display effect of the virtual image.

[0078] The present disclosure also provides a head-up display, comprising an imaging window 200 and the above-mentioned display device.

[0079] In some embodiments, the display device also includes a controller, which is connected to the display device, and the controller is configured to adjust the identification parameters of the corresponding virtual image logo according to the lit backlight 21 so that the virtual image logo is displayed within a preset backlight range, wherein the identification parameters include at least one of the size, spacing and displacement of the virtual image logo.

[0080] When the head-up display is working, the backlight 21 to be lit is determined according to the virtual image logo to be displayed, and then it is lit to emit backlight light, so that the display device emits image light. During the operation of the display device, the logo parameters of the displayed virtual image logo can be adjusted according to the lit backlight 21, so that the virtual image logo is displayed within the preset backlight range, thereby improving the display effect of the virtual image 400; at the same time, part of the lit backlight 21 can be turned off without affecting the display brightness, thereby reducing power consumption, avoiding damage to the display device, and increasing its service life.

[0081] That is, in this embodiment, not only can the arrangement mode and lamp bead size and other parameters of the backlight 21 be determined according to the virtual image logo to be displayed before the backlight 21 works, but also the logo parameters of the displayed virtual image logo can be adjusted in reverse according to the lit backlight 21 during the process of the backlight 21 being lit, so that the display effect of the virtual image 400 can be dynamically adjusted to improve the user's HUD usage experience.

[0082] In some embodiments, the controller is configured to determine whether the spanning area of ​​the virtual image logo corresponding to the lit backlight 21 is less than a preset area threshold. If so, the logo parameters of the virtual image logo are adjusted, wherein the spanning area is an area exceeding the area of ​​the main backlight 21 among at least two backlights 21 when the virtual image logo spans at least two backlights 21, or the spanning area is an area exceeding the area of ​​the main partition area among at least two partition areas when the virtual image logo spans at least two partition areas.

[0083] like Figure 8 As shown in (a), the virtual image mark of 60 km / h occupies the partition area 1 and the partition area 3, wherein the virtual image mark mainly occupies the partition area 1, that is, the partition area 1 is the main partition area of ​​the virtual image mark, and the spanning area of ​​the virtual image mark (the area exceeding the partition area 1) is less than the preset area threshold (for example, 10% of the area of ​​the main partition area). Therefore, it can be Figure 8 As shown in (b), the virtual image logo is moved rightward by a certain distance so that it is fully displayed in the partition area 1. While ensuring the overall display effect of the virtual image logo, there is no need to turn on the backlight 21 in the partition area 3, which effectively reduces power consumption. If the spanning area of ​​the virtual image logo is greater than or equal to the preset area threshold, in order to ensure the display effect of the virtual image logo, the logo parameters of the virtual image logo are not adjusted, and the corresponding backlight 21 in the partition area 3 is turned on to provide backlight.

[0084] Further, such as Figure 8 As shown in (c), in this embodiment, the size of the virtual image logo can also be reduced so that it can be fully displayed in the partition area 1.

[0085] In the above embodiment, the virtual image mark is changed from Figure 8 The virtual image logo is adjusted by moving or scaling the position shown in (a) so that it is fully displayed in partition area 1.

[0086] In some other embodiments, the virtual image mark may be moved to Figure 8 After the virtual image mark is moved to the position shown in (b) in the figure, it is reduced so that it appears Figure 8 The position shown in (c) can reduce the number of backlights 21 that are lit and reduce power consumption while ensuring the display effect of the virtual image logo.

[0087] The embodiment of the present disclosure also provides a means of transportation, including the above-mentioned head-up display. The means of transportation can be any one of a car, a truck, a pickup truck, a train, an airplane, a ship, etc.

[0088] When the head-up display is an airplane, the virtual image content can be displayed in a fusion with the sky; when the head-up display is a ship, the virtual image content can be displayed in a fusion with the sea surface.

[0089] The head-up display and the vehicle correspond to the display device in the above-mentioned embodiment. Any optional items in the display device embodiment are also applicable to the head-up display and the vehicle embodiment, which will not be described in detail here.

[0090] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

Claims

1. A display device, characterized in that: The display device is applied to a head-up display, the display device emits image light, the image light is reflected into an eye box through an imaging window corresponding to the head-up display, so that a user observes a virtual image formed by the image light, and the curvature of at least one of the horizontal and vertical directions of the imaging window is greater than 0 to form a first distortion form, and the display device includes: LCD display; A backlight module is installed on the back side of the liquid crystal display screen, and is used to provide backlight for the liquid crystal display screen so that the liquid crystal display screen emits the image light. The backlight module includes a plurality of backlight lamps, and the brightness of at least one of the plurality of backlight lamps can be independently adjusted according to the virtual image content of the virtual image. The plurality of backlight lamps are arranged in a shape whose curvature in at least one of the horizontal and vertical directions of the liquid crystal display screen is greater than 0, and the curvature direction of the shape is opposite to the curvature direction of the corresponding area in the imaging window.

2. The display device according to claim 1, characterized in that The plurality of backlights are arranged in an array, and the plurality of backlights arranged transversely are arranged in a non-linear manner to correspond to the curved transverse shape of the corresponding area in the imaging window.

3. The display device according to claim 1 or 2, characterized in that: The multiple backlights are arranged in partitions, and the multiple backlights in each partition area are arranged in an array or staggered. The arrangement of the backlights in at least two of the partition areas is different and / or the sizes of the lamp beads of the backlights are different. The arrangement of the backlights in the partition areas includes at least one of the arrangement density of the backlights, the spacing between two adjacent rows or two adjacent columns in the queue of the backlight arrangement, and the positional relationship of the backlight arrangement.

4. The display device according to claim 3, characterized in that: The arrangement of the backlights in at least one of the partitioned areas is determined according to at least one of the number of virtual image identifiers in the virtual image formed by the head-up display, the display granularity, the display duration, and the display frequency.

5. The display device according to claim 1, characterized in that At least two of the plurality of backlights are closely packed together, or at least two of the plurality of backlights are not closely packed together.

6. The display device according to claim 1, characterized in that: The backlight module also includes a backlight circuit board, and the plurality of backlight lamps are mounted on the backlight circuit board and are respectively connected to the backlight circuit board to control the opening and closing and / or brightness of the corresponding backlight lamps according to the virtual image content of the virtual image.

7. The display device according to claim 1, characterized in that The head-up display is an AR head-up display, which includes at least two display devices, each of which emits different image light to form different virtual images, and the arrangement of backlights corresponding to at least two display devices is different and / or the size of the backlight beads is different.

8. The display device according to claim 1, characterized in that: The plurality of backlights are arranged according to a transmission relationship between the virtual image and the eye box.

9. A head-up display, characterized in that: A display device comprising an imaging window and any one of claims 1 to 8.

10. The head-up display according to claim 9, characterized in that: The head-up display also includes a controller, which is connected to the display device. The controller is configured to adjust the identification parameters of the corresponding virtual image logo according to the lit backlight so that the virtual image logo is displayed within a preset backlight range, wherein the identification parameters include at least one of the size, spacing and displacement of the virtual image logo.

11. The head-up display according to claim 10, characterized in that: The controller is configured to determine whether the spanning area of ​​the virtual image logo corresponding to the lit backlight is less than a preset area threshold, and if so, adjust the logo parameters of the virtual image logo, wherein the spanning area is the area of ​​the main backlight in at least two backlights when the virtual image logo spans at least two backlights, or the spanning area is the area of ​​the main partition area in at least two partition areas when the virtual image logo spans at least two partition areas.

12. A means of transport, characterized in that: A heads-up display comprising the one of claims 9 to 10.

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