Backlight source, head-up display device and vehicle

Abstract

The utility model provides a backlight source, head-up display equipment and a vehicle, the backlight source is applied to the head-up display equipment, the backlight source comprises a lamp panel and a lamp bead array arranged on the lamp panel, all lamp beads in the lamp bead array are the same in color grade, and part of the lamp beads are different in brightness grade; the lamp beads with different brightness levels in the lamp bead array are alternately and evenly arranged, and the luminous flux difference value between any two lamp beads in the lamp bead array is smaller than or equal to 50 lm.

Description

Technical Field

[0001] This application relates to the field of head-up display technology, and more particularly to a backlight, a head-up display device, and a vehicle. Background Technology

[0002] Head-up display (HUD) technology uses optical reflection to project light emitted from an image source onto an imaging window (image panel, windshield, etc.), which then reflects the light into the driver's eye, forming a virtual image. This virtual image can display desired information, such as vehicle speed and other driving-related information, preventing driver distraction caused by looking down at the instrument panel while driving. This improves driving safety and provides a better driving experience.

[0003] Currently, in order to illuminate the entire display area, multiple LED beads need to be arranged on the light panel. However, due to the differences in brightness and color between different LED beads, different positions on the HUD screen will show different brightness trends and different color trends, affecting the driver's experience. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art, and proposes a backlight, head-up display device and vehicle that can balance the brightness and color differences between different LEDs on the light panel and improve the uniformity of overall brightness and color.

[0005] To achieve the above objectives, this application provides a backlight source for use in a head-up display device. The backlight source comprises a lamp board and an array of LEDs disposed on the lamp board. All LEDs in the array have the same color grade, while some LEDs have different brightness grades. The LEDs with different brightness grades are arranged alternately and evenly in the array, and the luminous flux difference between any two LEDs in the array is less than or equal to 50 lm.

[0006] In some embodiments, the luminous flux difference between any two LEDs in the LED array is less than or equal to 30 lm; or...

[0007] The luminous flux difference between any two LEDs in the LED array is less than or equal to 20 lm; or...

[0008] The luminous flux difference between any two LEDs in the LED array is less than or equal to 10 lm.

[0009] In some embodiments, the difference in brightness levels between any two adjacent LEDs in the LED array is greater than or equal to 1 and less than or equal to 2.

[0010] In some embodiments, the LED array includes multiple first LEDs and multiple second LEDs with different brightness levels, wherein one of any two adjacent LEDs in the array is a first LED and the other is a second LED; or,

[0011] The lamp array includes at least a number of first lamps, a number of second lamps, and a number of third lamps with different brightness levels, and the first lamps, the second lamps, and the third lamps are arranged alternately and cyclically on the lamp panel.

[0012] In some embodiments, the LED array includes at least a plurality of first LEDs and a plurality of second LEDs with different brightness levels. In each row of the LED array, one of any two adjacent LEDs is a first LED and the other is a second LED. Similarly, in each column of the LED array, one of any two adjacent LEDs is a first LED and the other is a second LED. Alternatively,

[0013] The lamp array includes at least multiple first lamps, multiple second lamps, and multiple third lamps with different brightness levels. In each row of the lamp array, any three adjacent lamps are, in order, the first lamp, the second lamp, and the third lamp. In each column of the lamp array, any three adjacent lamps are, in order, the first lamp, the second lamp, and the third lamp.

[0014] In some embodiments, there are at least two light panels, including a first light panel and a second light panel. The first light panel is provided with a first LED array, and the second light panel is provided with a second LED array. The first light panel is configured to provide backlight to a first display panel, and the second light panel is configured to provide backlight to a second display panel.

[0015] The first LED array uses LEDs with the same color grade as the second LED array.

[0016] The luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 50 lm; or, the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 30 lm; or, the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 20 lm; the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 10 lm.

[0017] As another technical solution, this application embodiment also provides a head-up display device, including the backlight provided in the above-mentioned embodiment.

[0018] In some embodiments, the head-up display device further includes a first display panel and a second display panel, the backlight includes a first lamp board and a second lamp board, the first lamp board is provided with a first lamp array, the second lamp board is provided with a second lamp array, the first lamp board is configured to provide backlight to the first display panel, the second lamp board is configured to provide backlight to the second display panel, the first display panel is configured to convert the backlight provided by the first lamp board into a first image light for forming a first virtual image and emit it, and the second display panel is configured to convert the backlight provided by the second lamp board into a second image light for forming a second virtual image and emit it;

[0019] The first LED array uses LEDs with the same color grade as the second LED array.

[0020] The luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 50 lm; or, the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 30 lm; or, the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 20 lm; the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 10 lm.

[0021] In some embodiments, a controller is also included, which is configured to independently drive at least one LED in the backlight.

[0022] In some embodiments, the head-up display device further includes a controller configured to independently control the duty cycle of each LED in the first LED array and the second LED array according to a target brightness value; and / or,

[0023] The controller is configured to adjust the pixel value of at least one pixel in the first display panel and the second display panel according to the target color value.

[0024] As another technical solution, this application embodiment also provides a vehicle, including:

[0025] The head-up display device described above is provided in the embodiments of this application.

[0026] Other objects and features of this application will become clear from reading the specification, claims and drawings. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0028] Figure 1 Optical path diagram of a single-layer imaging head-up display device for which the backlight is applied, as provided in the embodiments of this application;

[0029] Figure 2 Optical path diagram of a dual-layer imaging head-up display device for which a backlight is applied, as provided in an embodiment of the present invention;

[0030] Figure 3 A schematic diagram of the backlight panel and LED array provided in an embodiment of this application;

[0031] Figure 4 This is a schematic diagram illustrating the color levels used in the embodiments of this application;

[0032] Figure 5 Another schematic diagram of the backlight panel and LED array provided in the embodiments of this application;

[0033] Figure 6 This is another schematic diagram of the backlight panel and LED array provided in the embodiments of this application. Detailed Implementation

[0034] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0035] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0037] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0038] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0039] This application provides a backlight source for use in a head-up display (HUD) device, which can be installed on vehicles or other means of transportation. Figure 1As shown, the head-up display device includes an image source 100 for outputting image light. The image source 100 includes a backlight 10 and a display panel 20 disposed on the light-emitting side of the backlight. For example, the display panel 20 is a liquid crystal display panel. The display panel 20 includes multiple pixel units, each pixel unit including multiple pixels, for example, each pixel unit including red pixels, green pixels, and blue pixels; or, for example, each pixel unit including red pixels, green pixels, blue pixels, and white pixels. The display panel 20 is used to convert the light from the backlight 10 into image light. The windshield 200 of the vehicle is used to reflect the image light to a preset eye box area 300, so that when the observer's eyes are within the preset eye box area 300, they can see the image formed by the image light. At this time, the image seen by the observer is a virtual image 400 formed by the windshield 200 through reflection imaging. The observer can be a driver or a passenger. The observer can obtain the required vehicle information from the virtual image 400 in front of their line of sight, such as driving speed, fuel consumption, etc., or other information, such as images from virtual rearview mirrors or audio-visual entertainment images. The aforementioned preset eyebox area (i.e., eyebox) 300 specifically refers to the area where the observer's eyes are located, where they can see the image output by the head-up display device (i.e., the aforementioned virtual image 400). The image source 100 may also include an optical component 30, which is used to control the light emitted from the backlight 10. The optical component 30 may include a lens array, a diffusion element, etc.

[0040] Figure 1 The image shown is a single-layer imaging head-up display (HUD) where there is no magnifying element (e.g., a curved mirror) between the image source 100 and the vehicle's windshield 200. There is also a dual-layer imaging HUD, such as... Figure 2As shown, the head-up display device includes an image source, a planar reflective element 500, and a curved reflective element 600. The image source includes a backlight (not shown), a first display area 110, and a second display area 120. The first display area 110 includes a first display panel; the second display area 120 includes a second display panel. In this case, the backlight includes a first lamp board and multiple LEDs disposed on the first lamp board for providing backlight to the first display panel, and also includes a second lamp board and multiple LEDs disposed on the second lamp board for providing backlight to the second display panel. The first display panel is used to convert the backlight provided by the first lamp board into a first image ray R1 for forming a first virtual image and emit it. The second display panel is used to convert the backlight provided by the second lamp board into a second image ray R2 for forming a second virtual image and emit it. The planar reflective element 500 reflects the first image light ray R1 and the second image light ray R2 to the curved reflective element 600; the curved reflective element 600 gathers and reflects the first image light ray R1 and the second image light ray R2 emitted from the planar reflective element 500, which are then emitted through the light-emitting opening 410 to the windshield 200 (or other components capable of reflecting images), forming a first virtual image V1 and a second virtual image V2; wherein, a first preset angle exists between the first display area 110 and the second display area 120, and the propagation distances of the first image light ray R1 and the second image light ray R2 emitted to the curved reflective element 600 are different; thus, a second preset angle exists between the first virtual image V1 and the second virtual image V2, and the imaging distances of the first virtual image V1 and the second virtual image V2 are different. The first display area 110 and the second display area 120 can display different images to meet the user's need to view different images.

[0041] Whether it's a single-layer or dual-layer head-up display (HUD), the backlight used includes a backlight panel and LEDs mounted on the panel. Currently, to illuminate the entire display area of ​​the display panel, multiple LEDs need to be arranged on the backlight panel. However, because the LEDs are randomly arranged on the panel in related technologies, there are differences in brightness and color between different LEDs. This results in different brightness and color trends at different positions on the HUD screen, affecting the driver's experience.

[0042] To resolve the above technical issues, please refer to Figure 3 The backlight provided in this embodiment includes a lamp board 1 and an array of LEDs disposed on the lamp board 1. All LEDs 2 in the LED array have the same color level, and some LEDs 2 have different brightness levels. The LEDs 2 with different brightness levels are arranged alternately and uniformly in the LED array, and the luminous flux difference between any two LEDs in the LED array is less than or equal to 50 lm. For example, such as Figure 3As shown, the LED array includes multiple first LEDs 21 and multiple second LEDs 22 with different brightness levels. In any two adjacent LEDs 2 in the LED array, one is a first LED 21 and the other is a second LED 22. Figure 3 In this diagram, for ease of distinction, LEDs with cross-sections represent the first LED 21, and those without cross-sections represent the second LED 22. The first LED 21 and the second LED 22 are arranged alternately and evenly. For example... Figure 6 As shown, the lamp array includes multiple first lamps 21, multiple second lamps 22, and multiple third lamps 23 with different brightness levels. The first lamps 21, second lamps 22, and third lamps 23 are arranged alternately and cyclically on the lamp panel 1. That is, any three adjacent lamps 2 in the lamp array are the first lamp 21, the second lamp 22, and the third lamp 23 in sequence. Figure 6 In the diagram, for easy differentiation, LED beads with diagonal cross-sections represent the first LED bead 21, LED beads without cross-sections represent the second LED bead 22, and LED beads with square cross-sections represent the third LED bead 23. The first LED bead 21, the second LED bead 22, and the third LED bead 23 are arranged alternately and evenly.

[0043] Color grade refers to different color groups (or color ranges, color bins, etc.) divided according to the color coordinates of the light emitted by the LED. LEDs belonging to the same color grade have similar color coordinates of their emitted light, and therefore emit similar colors. In some embodiments, multiple color grades can be divided according to the color coordinates of the light emitted by the LED, for example... Figure 4 Based on chromaticity coordinates ( Figure 4 In the diagram, the x-axis represents the horizontal axis of the color coordinate system, and the y-axis represents the vertical axis. For example, the x and y coordinates on the CIE 1931 chromaticity diagram can be used to divide the color into three levels: the first color level H1, the second color level H2, and the third color level H3. The color levels in the embodiments of this application are the industry-standard color bins (BINs). In the LED array of this application embodiment, all LEDs 22 belong to the same color level, such as one of the first color level H1, the second color level H2, and the third color level H3. This effectively reduces the overall color difference of the backlight.

[0044] In some embodiments, the difference in x-coordinate values ​​between LEDs of the same color grade is less than or equal to 0.03, or less than or equal to 0.02, or less than or equal to 0.017, and the difference in y-coordinate values ​​is less than or equal to 0.03, or less than or equal to 0.02, or less than or equal to 0.017. For example, the difference in x-coordinate values ​​between LEDs of the same color grade is less than or equal to 0.03, and the difference in y-coordinate values ​​is less than or equal to 0.03; or, the difference in x-coordinate values ​​between LEDs of the same color grade is less than or equal to 0.02, and the difference in y-coordinate values ​​is less than or equal to 0.02; or, the difference in x-coordinate values ​​between LEDs of the same color grade is less than or equal to 0.017, and the difference in y-coordinate values ​​is less than or equal to 0.017.

[0045] A brightness level refers to a brightness group (or brightness range, brightness BIN, etc.) divided according to the luminous flux of the LED chips. LEDs within the same brightness level have similar luminous flux and therefore similar luminous brightness. In some embodiments, multiple brightness levels can be divided based on the luminous flux of the LED chips. The luminous flux can be divided into brightness levels at preset intervals, such as 5 lm, 10 lm, etc., or directly using the brightness level specifications provided by the LED chip manufacturer. For example, there are three brightness levels: a first brightness level A1, a second brightness level A2, and a third brightness level A3. The luminous flux range of the first brightness level A1 is 58 lm-66 lm (excluding 66 lm); the luminous flux range of the second brightness level A2 is 66 lm-76 lm (excluding 76 lm); and the luminous flux range of the third brightness level A3 is 76 lm-87 lm. The brightness levels in the embodiments of this application are the industry-standard brightness BINs.

[0046] The backlight provided in this embodiment effectively reduces overall color difference by ensuring all LEDs in the LED array have the same color level. Furthermore, by arranging some LEDs 2 with different brightness levels, and ensuring that the luminous flux difference between any two LEDs in the array is less than or equal to 50 lm, LEDs 2 with different brightness levels are evenly and alternately distributed across the entire LED panel 1, thereby improving overall brightness uniformity. Moreover, this LED arrangement, which considers both color and brightness levels, balances the brightness and color differences between different LEDs 2 on the LED panel 1, further improving overall brightness and color uniformity. Furthermore, during the production of LED chips, LED chips of the same model are usually distributed across different brightness levels. When arranging LED chips on a light board, if only LED chips of the same brightness level are used, other brightness levels cannot be utilized, resulting in resource waste and increased costs. However, arranging LED chips of different brightness levels on the light board allows for the full utilization of LED chips of different specifications, avoiding resource waste and increased costs caused by using only LED chips of the same brightness level.

[0047] In some embodiments, the luminous flux difference between any two LEDs 2 in the LED array is less than or equal to 30 lm; or, the luminous flux difference between any two LEDs 2 in the LED array is less than or equal to 20 lm; or, the luminous flux difference between any two LEDs 2 in the LED array is less than or equal to 10 lm. This avoids affecting the brightness uniformity due to excessive brightness differences between any two adjacent LEDs 2.

[0048] In some embodiments, the difference in brightness levels between any two adjacent LEDs 2 in the LED array is greater than or equal to 1 and less than or equal to 2. This avoids affecting brightness uniformity due to excessive brightness differences between any two adjacent LEDs 2. Taking a first brightness level A1, a second brightness level A2, and a third brightness level A3 as an example, in one specific embodiment, the LED array includes multiple first LEDs 21 and multiple second LEDs 22 with different brightness levels. One of the brightness levels of the first LEDs 21 and the second LEDs 22 can be the first brightness level A1, and the other can be the second brightness level A2. Based on this, the color level of all LEDs 22 is, for example, the second color level H2. In another specific embodiment, one of the brightness levels of the first LEDs 21 and the second LEDs 22 can be the second brightness level A2, and the other can be the third brightness level A3. Based on this, the color level of all LEDs 22 is, for example, the third color level H3.

[0049] It should be noted that, as Figure 3 and Figure 5 As shown, in the LED array, each LED can be either the first LED 21 or the second LED 22, as long as any two adjacent LEDs are either the first LED 21 or the second LED 22.

[0050] It should also be noted that in practical applications, the definition of two adjacent LEDs in an LED array can be determined based on the desired brightness uniformity and the shape of the LED array. For example, for... Figure 3 and Figure 5In the rectangular LED array shown, adjacent LEDs are defined as any two adjacent LEDs in each row and any two adjacent LEDs in each column of the rectangular LED array. In this case, taking an LED array comprising multiple first LEDs 21 and multiple second LEDs 22 with different brightness levels as an example, in each row of the LED array, one of any two adjacent LEDs 2 is a first LED 21 and the other is a second LED 22; similarly, in each column of the LED array, one of any two adjacent LEDs 2 is a first LED 21 and the other is a second LED 22. Taking an LED array comprising multiple first LEDs 21, multiple second LEDs 22, and multiple third LEDs 23 with different brightness levels as an example, any three adjacent LEDs 2 in each row of the LED array are arranged as first LED 21, second LED 22, and third LED 23 in sequence; similarly, any three adjacent LEDs 2 in each column of the LED array are arranged as first LED 21, second LED 22, and third LED 23 in sequence. Of course, in practical applications, the LED array can also be arranged in other shapes, such as a hexagonal array. In this case, taking an LED array comprising multiple first LEDs 21 and multiple second LEDs 22 with different brightness levels as an example, the hexagonal array includes multiple rows, where odd-numbered rows and even-numbered rows are staggered. The LEDs in the odd-numbered rows can be arranged alternately in the order of first LED 21, second LED 22, and first LED 21, while the LEDs in the even-numbered rows can be arranged alternately in the order of second LED 22, first LED 21, and second LED 22.

[0051] In some embodiments, the backlight may include a light panel 1, which may be applied, for example, to a light source such as a lamp panel 1. Figure 1 The single-layer imaging head-up display device is shown. In other embodiments, the backlight may further include at least two lamp panels 1, and the backlight may be applied, for example, to... Figure 2 The diagram shows a dual-layer imaging head-up display device. In this case, to ensure that the display effects of the first display panel and the second display panel are consistent, at least two lamp panels 1 include a first lamp panel and a second lamp panel. The first lamp panel is provided with a first lamp array, and the second lamp panel is provided with a second lamp array. The first lamp panel is configured to provide backlight to the first display panel, and the second lamp panel is configured to provide backlight to the second display panel.

[0052] The first LED array uses LEDs 2 with the same color level as the second LED array. This reduces the color difference between the first and second LED panels. Furthermore, in some embodiments, the luminous flux difference between any LED 2 in the first and second LED arrays is less than or equal to 50 lm; or, less than or equal to 30 lm; or, less than or equal to 20 lm; or, less than or equal to 10 lm. This reduces the brightness difference between the first and second LED panels, thereby achieving a more consistent display effect between the first and second display panels.

[0053] For example, the light panel 1 is divided into four types according to different color levels and / or brightness levels: type B1, type B2, type B3, and type B4. In type B1, the LED array has all LEDs at color level H2, and one of the brightness levels of the first LED 21 and the second LED 22 is at brightness level A1, while the other is at brightness level A2. In type B2, the LED array has all LEDs at color level H3, and one of the brightness levels of the first LED 21 and the second LED 22 is at brightness level A1, while the other is at brightness level A2. In type B3, the LED array has all LEDs at color level H2, and one of the brightness levels of the first LED 21 and the second LED 22 is at brightness level A2, while the other is at brightness level A3. In the LED array arranged on the fourth type of LED panel B4, all LEDs have a color level of the third color level H3, and one of the brightness levels of the first LED 21 and the second LED 22 is the second brightness level A2, while the other can be the third brightness level A3. Based on this, the first and second LED panels can be a combination of two LED panels selected from the first type B1, the second type B2, the third type B3, and the fourth type B4 to achieve a more consistent display effect between the first and second display panels. Specifically, the first and second LED panels can be of the same type, for example, both can be any one of the first type B1, the second type B2, the third type B3, and the fourth type B4. Alternatively, one of the first and second LED panels can be the first type B1, and the other can be the third type B3. Or, one of the first and second LED panels can be the second type B2, and the other can be the fourth type B4.

[0054] As another technical solution, this application embodiment also provides a head-up display device, including the backlight provided in the above-mentioned embodiment.

[0055] The head-up display device provided in this application embodiment can balance the brightness and color differences between different LED beads 2 on the lamp board 1 by adopting the backlight provided in this application embodiment, thereby improving the overall brightness and color uniformity.

[0056] Although the solution adopted in the above embodiments can balance the brightness and color differences between different LED beads 2 on the light panel 1 and improve the overall brightness and color uniformity, even if the brightness level is the same, there will still be brightness differences between LED beads within the same brightness level. For example, among all LED beads with a luminous flux range of 66lm-76lm, the brightness difference between the LED bead with the highest luminous flux and the LED bead with the lowest luminous flux is 15%. Therefore, there will still be brightness differences between LED beads within the same brightness level. To solve this problem, in some embodiments, the head-up display device also includes a controller connected to at least one LED bead in the backlight and configured to independently drive at least one LED bead, specifically capable of individually controlling the duty cycle of each LED bead. The duty cycle refers to the percentage of time the LED bead is lit within each cycle. By using a controller to independently control at least one LED bead in the backlight, the brightness of the LED bead can be controlled more precisely, thereby further reducing the brightness differences between LED beads. The aforementioned controller is, for example, a microprocessor such as a computer or PLC.

[0057] The head-up display device provided in the embodiments of this application is applied to, for example Figure 2 In the case of the dual-layer imaging head-up display device shown, the first display area 110 includes a first display panel; the second display area 120 includes a second display panel, a first lamp panel is used to provide backlight to the first display panel; the first display panel is used to convert the backlight provided by the first lamp panel into a first image ray R1 for forming a first virtual image and emit it; the second lamp panel is used to provide backlight to the second display panel; the second display panel is used to convert the backlight provided by the second lamp panel into a second image ray R2 for forming a second virtual image and emit it.

[0058] In some embodiments, the color levels of the LEDs used in the first LED array and the second LED array are the same. Furthermore, the luminous flux difference between any two LEDs in the first and second LED arrays is less than or equal to 50 lm; or, the luminous flux difference is less than or equal to 30 lm; or, the luminous flux difference is less than or equal to 20 lm; or, the luminous flux difference is less than or equal to 10 lm. This reduces the color and brightness differences between the first and second LED panels, thereby achieving a more consistent display effect between the first and second display panels.

[0059] Furthermore, in some embodiments, the head-up display device also includes a controller configured to independently control the duty cycle of each LED in the first and second LED arrays according to a target brightness value, thereby correcting the brightness of each LED. By individually controlling the brightness of each LED, the brightness of all LEDs reaches the target brightness value, further reducing the brightness difference between LEDs. For example, each LED is first lit individually, and the highest brightness of each LED at a 100% duty cycle is recorded. Then, the duty cycle of each LED is controlled to limit the brightness of each LED to a uniform target brightness value, which may be, for example, a brightness value determined according to actual needs.

[0060] In some embodiments, the controller is configured to adjust the pixel value of at least one pixel in the first display panel and the second display panel according to the target color value, so as to further reduce the display color deviation of the display panel due to the color difference of the LED beads.

[0061] In practical applications, the controller can be configured according to specific needs to independently control the duty cycle of each LED in the first and second LED arrays, and / or adjust the pixel value of at least one pixel in the first and second display panels.

[0062] As another technical solution, this application embodiment also provides a vehicle, including the head-up display device provided in this application embodiment.

[0063] The vehicle provided in this application embodiment uses the head-up display device provided in this application embodiment. Accordingly, the vehicle has all the advantages of the backlight included in the head-up display device, which will not be described in detail here.

[0064] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of this application, and this application is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this application, and these modifications and improvements are also considered to be within the scope of protection of this application.

Claims

1. A backlight source for use in a head-up display device, characterized in that, The lamp includes a lamp board and an array of LED beads disposed on the lamp board. All LED beads in the LED bead array have the same color grade, and some of the LED beads have different brightness grades. The LED beads with different brightness grades in the LED bead array are arranged alternately and evenly, and the luminous flux difference between any two LED beads in the LED bead array is less than or equal to 50 lm.

2. The backlight according to claim 1, characterized in that, The luminous flux difference between any two LEDs in the LED array is less than or equal to 30 lm; or... The luminous flux difference between any two LEDs in the LED array is less than or equal to 20 lm; or, The luminous flux difference between any two LEDs in the LED array is less than or equal to 10 lm.

3. The backlight according to claim 1, characterized in that, The brightness levels of any two adjacent LEDs in the LED array differ by a number greater than or equal to 1 and less than or equal to 2.

4. The backlight according to any one of claims 1-3, characterized in that, The LED array comprises multiple first LEDs and multiple second LEDs with different brightness levels. In any two adjacent LEDs in the array, one is a first LED and the other is a second LED; or... The lamp array includes at least a number of first lamps, a number of second lamps, and a number of third lamps with different brightness levels, and the first lamps, the second lamps, and the third lamps are arranged alternately and cyclically on the lamp panel.

5. The backlight according to any one of claims 1-3, characterized in that, The LED array comprises at least multiple first LEDs and multiple second LEDs with different brightness levels. In each row of the LED array, one of any two adjacent LEDs is a first LED and the other is a second LED. Similarly, in each column of the LED array, one of any two adjacent LEDs is a first LED and the other is a second LED; or... The lamp array includes at least multiple first lamps, multiple second lamps, and multiple third lamps with different brightness levels. In each row of the lamp array, any three adjacent lamps are, in order, the first lamp, the second lamp, and the third lamp. In each column of the lamp array, any three adjacent lamps are, in order, the first lamp, the second lamp, and the third lamp.

6. The backlight according to any one of claims 1-3, characterized in that, The light panel is at least two, and the at least two light panels include a first light panel and a second light panel. The first light panel is provided with a first LED array, and the second light panel is provided with a second LED array. The first light panel is configured to provide backlight to a first display panel, and the second light panel is configured to provide backlight to a second display panel. The first LED array uses LEDs with the same color grade as the second LED array. The luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 50 lm; or, the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 30 lm; or, the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 20 lm; the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 10 lm.

7. A head-up display device, characterized in that, Includes the backlight source as described in any one of claims 1-6.

8. The head-up display device according to claim 7, characterized in that, The head-up display device further includes a first display panel and a second display panel. The backlight includes a first lamp board and a second lamp board. A first lamp array is disposed on the first lamp board, and a second lamp array is disposed on the second lamp board. The first lamp board is configured to provide backlight to the first display panel, and the second lamp board is configured to provide backlight to the second display panel. The first display panel is configured to convert the backlight provided by the first lamp board into a first image light for forming a first virtual image and emit it. The second display panel is configured to convert the backlight provided by the second lamp board into a second image light for forming a second virtual image and emit it. The first LED array uses LEDs with the same color grade as the second LED array. The luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 50 lm; or, the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 30 lm; or, the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 20 lm; the luminous flux difference between any LED in the first LED array and any LED in the second LED array is less than or equal to 10 lm.

9. The head-up display device according to claim 7, characterized in that, It also includes a controller configured to independently drive at least one LED in the backlight.

10. The head-up display device according to claim 8, characterized in that, The head-up display device further includes a controller configured to independently control the duty cycle of each LED in the first LED array and the second LED array according to a target brightness value. And / or, The controller is configured to adjust the pixel value of at least one pixel in the first display panel and the second display panel according to the target color value.

11. A vehicle, characterized in that, include: The head-up display device as described in any one of claims 7-10.

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