Display device, head-up display device and backlight control method thereof

Abstract

The invention relates to a display device, a head-up display device and a backlight control method thereof. A display panel in the display device comprises a plurality of display areas, a backlight source comprises a plurality of light-emitting elements, the plurality of display areas are in one-to-one correspondence with the plurality of light-emitting elements, and a control module is used for determining brightness information corresponding to each display area according to an image to be displayed by the display panel; determining target brightness corresponding to each light-emitting element according to the brightness information corresponding to each display area; and controlling each light-emitting element based on the target brightness corresponding to each light-emitting element. When the display device provided by the invention is used for displaying, the target brightness corresponding to each light-emitting element in the backlight source is determined according to the to-be-displayed image, the light-emitting elements are controlled according to the target brightness, and light waste caused by lightening all the light-emitting elements is avoided by independently controlling each light-emitting element; the power consumption is reduced, and the light utilization rate and the image contrast are improved.

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 device and a backlight control method thereof. Background Art

[0002] HUD (head-up display) provides backlight for the display panel (such as TFT-LCD) through a backlight source, which includes multiple light-emitting elements (such as LED lights). When the HUD is imaging, the display panel converts the light provided by the backlight source into imaging light and emits it. The image light is reflected by the optical elements in the HUD and the windshield of the vehicle before reaching the human eye, allowing the user to see the virtual image formed in front of the windshield.

[0003] In the prior art, when a backlight source provides backlight for a display panel, all light-emitting elements in the backlight source are usually controlled uniformly, that is, all light-emitting elements in the backlight source are lit, and the light brightness of the light-emitting elements is controlled to be the same. However, lighting up all light-emitting elements causes the HUD backlight to consume a lot of power, and the light emitted by some light-emitting elements cannot be used, so the light utilization rate is low, and the display panel of the HUD is more likely to heat up, which affects its service life. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a display device, a head-up display device and a backlight control method thereof.

[0005] The present disclosure provides a display device, including a display panel, a backlight source and a control module, wherein the display panel includes multiple display areas, the backlight source includes multiple light-emitting elements, and the multiple display areas correspond to the multiple light-emitting elements one by one, and the control module is used to: determine brightness information corresponding to each of the display areas according to an image to be displayed on the display panel; determine a target brightness corresponding to each of the light-emitting elements according to the brightness information corresponding to each of the display areas; and control each of the light-emitting elements based on the target brightness corresponding to each of the light-emitting elements.

[0006] Optionally, the control module is specifically used to: determine a pixel group corresponding to each of the display areas according to an image to be displayed on the display panel; and determine the brightness information corresponding to each of the display areas according to a pixel value of the pixel group corresponding to each of the display areas.

[0007] Optionally, the control module is specifically used to: determine the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area; calculate the weighted average of the brightness values ​​of each pixel to obtain the brightness information corresponding to each display area.

[0008] Optionally, the control module is also used to: when the first target display element in the image to be displayed is distributed in at least two adjacent display areas in the display panel, determine the target brightness of the light-emitting elements corresponding to each of the at least two adjacent display areas, wherein the pixel values ​​of each pixel in the first target display element are the same; when the target brightness of the light-emitting elements corresponding to each of the at least two adjacent display areas is different, adjust the pixel value of the pixel of the first target display element located in at least one of the at least two adjacent display areas, or adjust the target brightness of the light-emitting elements corresponding to at least one of the at least two adjacent display areas, until the display brightness of the first target display element displayed in the at least two adjacent display areas is consistent.

[0009] Optionally, the control module is specifically used to: determine the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area; compare the brightness value of at least one pixel with a preset threshold to obtain a comparison result for each display area; and determine the brightness information of each display area according to the comparison result of each display area.

[0010] Optionally, the control module is specifically used to: determine the maximum value among the brightness values ​​of each pixel; compare the maximum value with the preset threshold to obtain a comparison result for each display area; when the comparison result is that the maximum value is greater than the preset threshold, determine the brightness information of the display area as the first brightness information; or, when the comparison result is that the maximum value is less than or equal to the preset threshold, determine the brightness information of the display area as the second brightness information, wherein the target brightness corresponding to the light-emitting element determined according to the first brightness information is higher than the target brightness corresponding to the light-emitting element determined according to the second brightness information.

[0011] Optionally, the pixel value of each pixel in the pixel group corresponding to each display area includes an RGB value; the control module is specifically used to: when the RGB value of each pixel in the pixel group corresponding to the display area is greater than a preset RGB value, determine the brightness information of the display area as third brightness information; or, when the RGB value of each pixel in the pixel group corresponding to the display area is less than or equal to a preset RGB value, determine the brightness information of the display area as fourth brightness information, wherein the target brightness corresponding to the light-emitting element determined according to the third brightness information is higher than the target brightness corresponding to the light-emitting element determined according to the fourth brightness information.

[0012] Optionally, the control module is also used to: determine, based on the image to be displayed on the display panel, that the distance between the first part of the second target display element and the center of the first display area is less than a preset distance threshold, the second part of the second target display element is located at the junction of the second display area and the third display area, and the target brightness of the light-emitting element corresponding to one of the second display area and the third display area is zero, and the target brightness of the light-emitting element corresponding to the other display area is a fifth brightness greater than zero; and adjust the target brightness of the light-emitting element with a target brightness of zero among the light-emitting elements corresponding to the second display area and the third display area to a sixth brightness greater than zero.

[0013] Optionally, the sixth brightness is a brightness value determined based on the fifth brightness and is less than or equal to the fifth brightness; or, the sixth brightness is a preset brightness value; or, the sixth brightness is a brightness value determined based on the distance between the first part of the second target display element and the center of the first display area, and the corresponding relationship between the distance and the brightness value.

[0014] Optionally, the control module is specifically used to: determine a brightness adjustment value corresponding to each light-emitting element according to the brightness of the external environment; and control each light-emitting element based on the target brightness corresponding to each light-emitting element and the brightness adjustment value.

[0015] The present disclosure also provides a head-up display device, comprising any one of the display devices described above and a reflective imaging unit, wherein the reflective imaging unit is located on the light-emitting side of the display device and is configured to reflect imaging light emitted by the display device to an observation area of ​​the head-up display device.

[0016] Optionally, the display panel is used to display the image to be displayed while the control module controls each of the light-emitting elements based on the target brightness corresponding to each of the light-emitting elements; the head-up display device also includes an optical element for imaging the image displayed on the display panel into a naked-eye 3D virtual image.

[0017] The present disclosure also provides a backlight control method for a head-up display device, the head-up display device comprising a display panel, a backlight source and a control module, the display panel comprising a plurality of display areas, the backlight source comprising a plurality of light-emitting elements, the plurality of display areas corresponding one-to-one to the plurality of light-emitting elements, the method comprising: determining brightness information corresponding to each of the display areas according to an image to be displayed on the display panel; determining a target brightness corresponding to each of the light-emitting elements according to the brightness information corresponding to each of the display areas; and controlling each of the light-emitting elements based on the target brightness corresponding to each of the light-emitting elements.

[0018] The technical solution provided by the present disclosure has the following advantages over the prior art: when displaying, the display device provided by the present disclosure can determine the target brightness corresponding to each light-emitting element in the backlight source according to the image to be displayed, and control the light-emitting element according to the target brightness. By controlling each light-emitting element individually, the waste of light caused by lighting up all the light-emitting elements can be avoided, thereby reducing power consumption, improving light utilization and image contrast. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0020] In order to more clearly illustrate the embodiments of the present invention 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0021] Figure 1 A schematic diagram of a partial top view of a display device provided in an embodiment of the present disclosure;

[0022] Figure 2 A schematic diagram of a partial cross-sectional structure of a display device provided in an embodiment of the present disclosure;

[0023] Figure 3 A schematic diagram of the structure of a control module provided in an embodiment of the present disclosure;

[0024] Figure 4 A schematic diagram of a partial top view of another display panel plane provided in an embodiment of the present disclosure;

[0025] Figure 5 A schematic diagram of a partial top view of another display panel plane provided in an embodiment of the present disclosure;

[0026] Figure 6 A schematic diagram of a partial top view of another display panel plane provided in an embodiment of the present disclosure;

[0027] Figure 7 A schematic diagram of the structure of a head-up display device provided in an embodiment of the present disclosure;

[0028] Figure 8 A schematic flow chart of a backlight control method for a head-up display device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purposes, features and advantages of the embodiments of the present disclosure, the scheme of the embodiments of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features therein can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the embodiments of the present disclosure, but the embodiments of the present disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0031] During the research process, the inventors of the present application discovered that during the use of the HUD, most of the display area of ​​the display panel is a black content-free area (transparent area), and the light emitted by the light-emitting elements in the backlight source corresponding to the content-free area will be converted into heat by means of blocking, absorption, refraction, etc. This not only makes the HUD power consumption high and the light utilization rate low, but also makes the display panel more prone to heat and shortens its service life.

[0032] An embodiment of the present disclosure provides a display device, such as Figure 1 as well as Figure 2 As shown ( Figure 1 is a schematic diagram of a partial top view of the structure of the display device, Figure 2 Schematic diagram of a partial cross-sectional structure of a display device, including a display panel 10, a backlight source 20 and a control module 30, the display panel 10 includes a plurality of display areas 100, the backlight source 20 includes a plurality of light-emitting elements 200, and the plurality of display areas 100 correspond one to one to the plurality of light-emitting elements 200.

[0033] Specifically, Figure 1 and Figure 2 As shown, when the light emitting element 200 emits light, the light emitted by it can cover a certain area in the display panel 10, that is, the illumination area of ​​the light emitting element 200. The multiple display areas 100 correspond to the multiple light emitting elements 200 one by one, which means that the illumination area of ​​one light emitting element 200 overlaps with a display area 100 on the display panel 10, and the illumination areas of the multiple light emitting elements 200 can cover the display panel 10 together. Optionally, the projection area of ​​all the illumination areas formed by the multiple light emitting elements 200 on the display panel 10 covers the back of the display panel 10, and the area of ​​the projection area is equal to the back area of ​​the display panel 10. In specific implementation, the display areas corresponding to each other of the light emitting elements do not completely overlap, preferably do not overlap.

[0034] Among them, multiple display areas 100 are located on the display surface of the display panel 10, and the display area of ​​the display panel 10 can be divided into multiple display areas 100 according to a preset rule. The display panel 10 also includes a back surface opposite to the display surface. The light source light emitted by the light-emitting element in the backlight source is incident on the back surface of the display panel 10, and is converted into imaging light by the display panel and then emitted from the display surface.

[0035] The control module 30 is used for:

[0036] According to the image to be displayed on the display panel 10 , brightness information corresponding to each display area 100 is determined.

[0037] Specifically, the content to be displayed in each display area can be determined based on the image to be displayed on the display panel. The content to be displayed in each display area is the content in the image to be displayed that is located in each display area. Since the content to be displayed in different display areas will be different and some display areas do not have corresponding content to be displayed, naturally, the brightness information corresponding to different display areas will also be different, which facilitates the subsequent determination of the target brightness corresponding to each light-emitting element based on the brightness information corresponding to each display area.

[0038] According to the brightness information corresponding to each display area 100 , the target brightness corresponding to each light emitting element 200 is determined.

[0039] Specifically, the target brightness corresponding to each light emitting element is determined according to the brightness information corresponding to each display area, so that each light emitting element in the backlight source can be controlled individually according to the target brightness corresponding to each light emitting element.

[0040] Each light emitting element 200 is controlled based on the target brightness corresponding to each light emitting element 200 .

[0041] Among them, for the light-emitting element with a target brightness of zero, the light-emitting element is turned off, that is, the light-emitting element is not lit, so that the light-emitting element does not emit light; for the light-emitting element with a target brightness not zero, the corresponding light-emitting element is driven to emit light according to the target brightness.

[0042] Specifically, the control module controls each light emitting element individually, thereby enabling accurate regulation of the backlight of the display panel. Optionally, in order to save computing resources of the control module, if there are multiple light emitting elements corresponding to the same target brightness, the control module can uniformly control the light emitting elements with the same target brightness.

[0043] When displaying, the display device provided by the embodiment of the present disclosure determines the target brightness corresponding to each light-emitting element in the backlight source according to the image to be displayed, and controls the light-emitting element according to the target brightness. By controlling each light-emitting element individually, the waste of light caused by lighting up all the light-emitting elements can be avoided, thereby reducing power consumption, improving light utilization and image contrast.

[0044] Specifically, according to the distribution of the display content in each display area in the image to be displayed, the display area of ​​the display panel can be divided into a dark area and a brightness area. The dark area is a display area with low display brightness (or no display content), and the bright area is a display area with high display brightness (or display content). The brightness information corresponding to the bright area and the dark area is different, and the target brightness of the light-emitting element determined according to the brightness information is also different, thereby achieving the backlight control of the dark area and the bright area of ​​the image respectively. Since the backlight brightness of the dark area and the brightness is different, the effect of improving the image contrast can be achieved, and then the contrast of the virtual image formed by the head-up display device is also improved. At the same time, reducing the brightness of the light-emitting element corresponding to the dark area or turning off the light-emitting element in the dark area can also reduce the backlight power consumption, thereby reducing the overall power consumption of the display panel.

[0045] Specifically, for the sake of clarity of the drawings, Figure 1 and Figure 2 Only the connection relationship between the control module 30 and the outermost light-emitting element 200 is shown, which does not mean that there is no connection relationship between the control module 30 and other light-emitting elements; any connection method that enables the control module to control the light-emitting element and adjust the state of the light-emitting element is applicable to the embodiments of the present disclosure and is not further limited here.

[0046] Specifically, the control module includes an FPGA (Field Programmable Gate Array) and is used to implement the functions of the control module. In a specific embodiment, the structure of the control module is as follows: Figure 3As shown, first, the FPGA obtains the next frame of the image to be displayed in the above embodiment by acquiring the video image signal, and then determines the target brightness corresponding to each light-emitting element according to the method in the above embodiment, and sends the target brightness to the corresponding LED Driver (light-emitting diode Driver) through SPI (Serial Peripheral interface), and the LED Driver drives the corresponding light-emitting element to emit light according to the target brightness. Optionally, the video image signal is transmitted to the FPGA in the form of LVDS (Low-Voltage Differential Signaling), and the FPGA will transmit the video image signal to the display panel in the form of LVDS while controlling the LED light brightness, so as to display the image on the display panel.

[0047] Specifically, the LED Driver includes a register for storing the target brightness corresponding to each light-emitting element sent by the FPGA. When a frame of the image to be displayed is completed, the LED Driver updates the register. In a specific implementation, there can be multiple LED Drivers, which are connected in series to control multiple light-emitting elements respectively. In a specific embodiment, the backlight source includes a total of 144 independent light-emitting elements, which are distributed in 9 rows and 16 columns to form a light-emitting element array. There are three LED Drivers, each of which controls 3 rows of light-emitting elements respectively. The first LED Driver is connected to and controls the first three rows of light-emitting elements, the second LED Driver is connected to and controls the middle three rows of light-emitting elements, and the third LED Driver is connected to and controls the last three rows of light-emitting elements.

[0048] Optionally, the LED Driver drives the corresponding light-emitting element to emit light according to the target brightness by PWM (Pulse width modulation) or PAM (Pulse Amplitude Modulation). Optionally, the LED Driver can use the TLC6C5748-Q1 current driver. The TLC6C5748-Q1 is a 48-channel, constant current driver. Each channel corresponds to a 16-bit grayscale control register. The TLC6C5748-Q1 adjusts the brightness of the light-emitting element by PWM. The SPI of the TLC6C5748-Q1 can transmit 769 bits of data at a time. When the first bit of the data is 0, the remaining 768 bits correspond to the grayscale control registers of the 48 channels.

[0049] Specifically, the control module further includes a deserializer, which is used to convert a high-speed serial video stream into a low-speed LVDS format video stream required by the FPGA. Optionally, the model of the deserializer can be MAX96752.

[0050] Optionally, the display area of ​​the display panel 10 is divided into a plurality of display areas according to the arrangement of the light emitting elements in the backlight source 20. For example, when the light emitting elements are arranged in a rectangular manner, the display area of ​​the display panel 10 can be divided into Figure 1 The projection of the illumination area formed by each light emitting element on the display panel is also rectangular. When the light emitting elements are arranged in a hexagonal manner, the display area of ​​the display panel 10 can be divided into Figure 4 In order to briefly describe the inventive concept of the disclosed embodiment, other embodiments and their drawings all adopt the scheme that the arrangement of light emitting elements and the corresponding display area are rectangular. Those skilled in the art can implement the arrangement of light emitting elements and the shape of the corresponding display area in the corresponding embodiment as follows according to the text description and the drawings. Figure 4 The hexagonal and other shapes shown are all within the scope of protection of the present disclosure and will not be described in detail.

[0051] In some embodiments, the control module is specifically configured to:

[0052] According to the image to be displayed on the display panel, a pixel group corresponding to each display area 100 is determined, and the pixel group includes multiple pixels. Specifically, the image to be displayed is composed of multiple pixels, each pixel displays a color, and the pixel group in the image to be displayed corresponding to each display area can be determined according to the distribution of the display content in the image to be displayed in each display area, that is, the multiple pixels in the image to be displayed corresponding to each display area. Among them, the display panel includes multiple pixel units, each pixel unit corresponds to a group of three primary color filters, and one pixel in the image to be displayed corresponds to one pixel unit on the display panel.

[0053] The brightness information corresponding to each display area 100 is determined according to the pixel value of the pixel group corresponding to each display area 100 .

[0054] In some embodiments, the control module is specifically configured to:

[0055] The brightness value of each pixel is determined according to the pixel value of each pixel in the pixel group corresponding to each display area.

[0056] Specifically, the brightness value of the pixel is the gray value of the pixel (also called brightness or grayscale value). The pixel value of the pixel in the image to be displayed is an RGB value. Different colors are represented by RGB values. The three RGB colors are usually represented by integers from 0 to 255 respectively. The RGB value can be converted into a gray value and represents the brightness level of the pixel.

[0057] Optionally, the color gamut conversion can be performed on the pixel value by the following formula, that is, the gray value of the pixel is obtained by the RGB value:

[0058] gray=α×R+β×G+γ×B

[0059] Among them, gray is the gray value, RGB values ​​R, G, B are all integers from 0 to 255, and α+β+γ=1. In a specific embodiment, α=0.299, β=0.587, and γ=0.114.

[0060] The weighted average of the brightness values ​​of each pixel is calculated to obtain the brightness information corresponding to each display area.

[0061] Specifically, when a pixel group in a display area has N pixels, the brightness value of each pixel is G1, G2, G3, ... G N , the weight of each pixel brightness value is P1, P2, P3...P N , then the weighted average of the brightness values ​​of each pixel corresponding to the display area is

[0062] Specifically, the weighted average of the brightness values ​​of each pixel corresponding to each display area obtained by the above calculation is a specific value. The weighted average is used as brightness information, and the target brightness of the corresponding light-emitting element is determined based on the brightness information, thereby enabling individual regulation of the light-emitting element.

[0063] In a specific embodiment, the weight added to the brightness value of each pixel is the square of the brightness value of the pixel.

[0064] In some embodiments, the control module is further configured to:

[0065] When a first target display element in an image to be displayed is distributed in at least two adjacent display areas in a display panel, target brightness of light-emitting elements corresponding to the at least two adjacent display areas is determined, wherein pixel values ​​of pixels in the first target display element are the same.

[0066] In a specific embodiment, Figure 5As shown, there are two adjacent first display areas 110 and second display areas 120 , first target display elements 41 are distributed in the first display area 110 and the second display area 120 , and the pixel values ​​of each pixel in the first target display element 41 are the same.

[0067] When the target brightness of the light-emitting elements corresponding to at least two adjacent display areas is different, the pixel value of the pixel of the first target display element in at least one display area of ​​the at least two adjacent display areas is adjusted, or the target brightness of the light-emitting element corresponding to at least one display area of ​​the at least two adjacent display areas is adjusted until the display brightness of the first target display element displayed in the at least two adjacent display areas is consistent. Specifically, the display brightness of the first target display element displayed in the at least two adjacent display areas is consistent, including that the display brightness of each part of the first target display element is the same or the difference is within a preset range.

[0068] In a specific embodiment, Figure 5 As shown, since the first display area 110 and the second display area 120 display different contents in the area other than the first target display element 41, for example, the first display area 110 also includes a display element 42, while the second display area does not, the presence of the display element 42 may cause the first display area 110 and the second display area 120 to have different brightness information finally calculated, thereby causing the target brightness of the light-emitting elements corresponding to the first display area 110 and the second display area 120 to be different. At this time, the first display elements 41 that should display the same color are distributed in the areas where the brightness of the two light-emitting elements is different, resulting in inconsistent display brightness, which leads to different colors in the two areas in visual effect. In order to optimize the problem of inconsistent display brightness, it is necessary to adjust the pixel value of the first target display element or the brightness of the light-emitting elements in the two display areas so that the final display effect is the same.

[0069] Specifically, when the brightness of the light-emitting element corresponding to the first display area 110 is lower than the brightness of the light-emitting element corresponding to the second display area 120, the target brightness of the light-emitting element corresponding to the first display area 110 may be increased, or the target brightness of the light-emitting element corresponding to the second display area 120 may be decreased. The pixel value of the first target display element may be adjusted by adjusting the pixel value of the first target display element 41 in the first display area 110 or the second display area 120, wherein the R, G, and B components of the pixel to be adjusted (e.g., the pixel located in the first display area 110 or the second display area 120) may be adjusted in proportion to the ratio of the R, G, and B components in the original pixel value of a single pixel in the first target display element 41.

[0070] Figure 5Only an embodiment in which a first display element is distributed in two different display areas is shown, and those skilled in the art can Figure 5 Description of the Embodiments The embodiments in which the first display element is distributed in three, four or more different display areas are implemented and will not be described in detail.

[0071] The disclosed embodiment also provides another method for individually adjusting each light emitting element. In some embodiments, the control module is specifically used to:

[0072] The brightness value of each pixel is determined according to the pixel value of each pixel in the pixel group corresponding to each display area.

[0073] Specifically, the brightness value of a pixel is the grayscale value of the pixel. For the description of the grayscale value, reference may be made to the above embodiment and will not be repeated here.

[0074] The brightness value of at least one pixel is compared with a preset threshold to obtain a comparison result for each display area.

[0075] According to the comparison result of each display area, the brightness information of each display area is determined.

[0076] The above embodiment can divide pixels into brighter pixels and darker pixels by comparing with a preset threshold, and then determine whether each display area is a bright area or a dark area through the comparison result, so as to adjust the backlight of the dark area and the bright area of ​​the image separately, thereby improving the contrast of the image.

[0077] In some embodiments, the control module is specifically configured to:

[0078] Determine the maximum value among the brightness values ​​of the pixels.

[0079] The maximum value is compared with the preset threshold to obtain the comparison result of each display area.

[0080] When the comparison result is that the maximum value is greater than the preset threshold, the brightness information of the display area is determined as the first brightness information; or, when the comparison result is that the maximum value is less than or equal to the preset threshold, the brightness information of the display area is determined as the second brightness information, wherein the target brightness corresponding to the light-emitting element determined according to the first brightness information is higher than the target brightness corresponding to the light-emitting element determined according to the second brightness information.

[0081] In some embodiments, the first brightness information and the second brightness information can be fixed values. Therefore, when the target brightness of the light-emitting element is determined according to the above embodiment, since each display area has only two comparison results, there are only two corresponding target brightnesses. Although the brightness adjustment of the light-emitting element is not as accurate as the above embodiment, the calculation cost of the control module is much reduced compared to the above embodiment. Naturally, the calculation speed of the control module can also be improved accordingly.

[0082] In a specific embodiment, the preset threshold is zero, the target brightness corresponding to the light-emitting element determined according to the first brightness information is a first brightness greater than zero, and the target brightness corresponding to the light-emitting element determined according to the second brightness information is zero.

[0083] A pixel brightness value of zero indicates that the color of the pixel is pure black. If the maximum value of the brightness values ​​of each pixel in a display area is equal to zero, it means that the color of the pixels in the display area is all black, that is, there is no content to be displayed in the display area. At this time, the light-emitting element corresponding to the display area can be turned off to save power consumption of the display device. For display areas where there are pixels whose color is not black, the brightness of the light-emitting element can be set to a normal brightness value, that is, the first brightness mentioned above.

[0084] In some embodiments, the pixel value of each pixel in the pixel group corresponding to each display area includes an RGB value;

[0085] The control module is specifically used for:

[0086] When the RGB value of each pixel in the pixel group corresponding to the display area is greater than the preset RGB value, the brightness information of the display area is determined as the third brightness information; or, when the RGB value of each pixel in the pixel group corresponding to the display area is less than or equal to the preset RGB value, the brightness information of the display area is determined as the fourth brightness information, wherein the target brightness corresponding to the light-emitting element determined according to the third brightness information is higher than the target brightness corresponding to the light-emitting element determined according to the fourth brightness information. Specifically, the target brightness corresponding to the light-emitting element determined according to the third brightness information is the third brightness greater than zero, and the target brightness corresponding to the light-emitting element determined according to the fourth brightness information is zero.

[0087] The brightness value of each pixel is obtained by color gamut conversion based on the RGB value of each pixel. The specific conversion process can refer to the above embodiment and will not be repeated here. The preset RGB value can be the R, G, B component threshold: the RGB threshold (Rth, Gth, Bth) composed of Rth, Gth, and Bth, where Rth, Gth, and Bth are all integers greater than zero and less than 255. The RGB value of the pixel is greater than the preset RGB value, that is, at least one of the R, G, and B components of the pixel is greater than the corresponding component threshold; the RGB value of the pixel is less than or equal to the preset RGB value, that is, the R, G, and B components of the pixel are all less than or equal to the corresponding component threshold.

[0088] Optionally, Rth, Gth, and Bth are all zero, and when the RGB values ​​of each pixel in the pixel group corresponding to the display area are all greater than zero, the brightness information of the display area is determined as the third brightness information; or, when the RGB values ​​of each pixel in the pixel group corresponding to the display area are all zero, the brightness information of the display area is determined as the fourth brightness information. A pixel brightness value of zero indicates that the color of the pixel is pure black, and when the pixel brightness value is zero, the corresponding RGB values ​​are also necessarily zero, so the color gamut conversion process can be omitted, and the light-emitting element can be directly controlled according to the RGB value of each pixel, further saving computing resources.

[0089] Specifically, the third brightness information may be set to a normal brightness value, and the fourth brightness information may be zero, which is not further limited here.

[0090] In some embodiments, the control module is further configured to:

[0091] like Figure 6 As shown, according to the image to be displayed on the display panel, it is determined that the distance between the first part 431 of the second target display element 43 and the center of the first display area 110 is less than a preset distance threshold, the second part 432 of the second target display element 43 is located at the junction of the second display area 120 and the third display area 130, and the target brightness of the light-emitting element corresponding to one of the second display area 120 and the third display area 130 is zero, and the target brightness of the light-emitting element corresponding to the other display area is a fifth brightness greater than zero, and the target brightness of the light-emitting element with a target brightness of zero among the light-emitting elements corresponding to the second display area and the third display area is adjusted to a sixth brightness greater than zero.

[0092] Since each display area corresponds to only one light-emitting element, and the light-emitting element is usually located in the center of the display area, the brightness at the center of the display area will be slightly higher than the brightness at the edge. When the situation in the above embodiment exists, when the display element part located at the edge of the two display areas can only be displayed with the help of the backlight emitted by the light-emitting element of one of the display areas, the parts of the same display element located in different display areas will have inconsistent display brightness. Therefore, when the above situation occurs, it is necessary to turn on all the light-emitting elements corresponding to the two display areas with display elements at the edge, so as to fill the light for the display elements at the edge, thereby solving the problem of inconsistent display brightness.

[0093] Specifically, the sixth brightness is a brightness value determined based on the fifth brightness and is less than or equal to the fifth brightness, for example, the sixth brightness is a*fifth brightness, where 0<a≤1; or, the sixth brightness is a preset brightness value, for example, 1 / 2 of the highest brightness value that can be achieved when the light-emitting element is working; or, the sixth brightness is a brightness value determined based on the distance between the first part of the second target display element and the center of the first display area, and the corresponding relationship between the distance and the brightness value, wherein different distances correspond to different brightness values.

[0094] In some embodiments, the control module is specifically configured to:

[0095] Determine the brightness adjustment value corresponding to each light emitting element according to the external environment brightness;

[0096] Each light emitting element is controlled based on the target brightness and the brightness adjustment value corresponding to each light emitting element.

[0097] Specifically, the control module can sense the brightness of the external environment through an optical sensor, and adjust the brightness of some or all light-emitting elements in the backlight source according to the overall brightness of the external environment. For example, when the brightness of the external environment is dim, in order to avoid glare to the user when using the display device, the above-mentioned brightness adjustment value will be used to reduce the brightness of the light-emitting element (for example, the light-emitting element whose target brightness is not zero); when the brightness of the external environment is bright, in order to enable the user to clearly see the displayed content, the above-mentioned brightness adjustment value will be used to increase the brightness of the light-emitting element (for example, the light-emitting element whose target brightness is not zero).

[0098] Optionally, the control module can obtain the adjusted brightness value of each light-emitting element based on the target brightness and the brightness adjustment value corresponding to each light-emitting element, wherein, for the light-emitting elements whose target brightness is not zero, the adjusted brightness value of each light-emitting element is obtained according to the target brightness and the brightness adjustment value, and for the light-emitting elements whose target brightness is zero, the brightness is not adjusted according to the brightness adjustment value.

[0099] In a specific embodiment, the brightness of the light-emitting element is controlled by the corresponding 16-bit GS register. The hexadecimal 0xffff in the register represents the maximum brightness of the light-emitting element, and 0x0000 represents turning off the light-emitting element. The control module maps the brightness information corresponding to each display area to the target brightness of each light-emitting element (for example, mapping the brightness value in the brightness information to a hexadecimal value), recorded as value1, and sets the brightness adjustment value value2 according to the brightness of the external environment. Finally, the final brightness of each light-emitting element is determined based on value1 and value2. Specifically, the value calculated according to the formula (value1 / 0xff)×(value2 / 0xff)×0xffff can be written into the GS register and used as the final brightness of each light-emitting element.

[0100] In a specific embodiment, the control module is further used for:

[0101] Determine the manual adjustment value corresponding to each light emitting element according to the manual setting;

[0102] Each light emitting element is controlled based on the target brightness, the brightness adjustment value and the manual adjustment value corresponding to each light emitting element.

[0103] Specifically, the user can set the overall brightness of the display device to suit the preferences of different users. The user's manual setting of the display device can be combined with the target brightness and brightness adjustment value in the above embodiment and used together to control the light-emitting element.

[0104] Based on the same inventive concept, corresponding to the display device of any of the above embodiments, the present application also provides a head-up display device, such as Figure 7 As shown, it includes a display device 1 of any of the above embodiments and a reflective imaging unit 2, the reflective imaging unit 2 is located on the light emitting side of the display device 1, and is configured to reflect the imaging light emitted from the display device 1 from the emission port 5 to the observation area 3 of the head-up display device, so that the user can observe the virtual image formed at the imaging position 4 outside the reflective imaging unit 2 when both eyes are located in the observation area.

[0105] The head-up display utilizes the reflective imaging portion to reflect the outgoing light of the display device, so that the observer can simultaneously observe the virtual image formed outside the reflective imaging portion and the object outside the reflective imaging portion in the observation area. When displaying, the head-up display device provided by the embodiment of the present disclosure can individually control each light-emitting element for the image to be displayed, thereby avoiding turning on all light-emitting elements, and only turning on some light-emitting elements, and the light-emitting brightness of each light-emitting element can also be independently controlled. By controlling the backlight of different areas corresponding to the image to be displayed, it is possible to turn off some light-emitting elements and light up other light-emitting elements, thereby improving the image contrast, thereby improving the contrast of the virtual image imaged by the head-up display, and at the same time, it is also possible to reduce the power consumption of the head-up display device by turning off some light-emitting elements or reducing the brightness of some light-emitting elements.

[0106] Specifically, as shown in FIG8 , the head-up display device further includes an amplifying component, which includes, for example, a curved reflector 7, or includes a curved reflector 7 and a flat reflector 6. The amplifying component is used to reflect the image light emitted by the display device 1 to the reflective imaging unit 2 to amplify the image displayed in the display device 1 into a virtual image, wherein the image light is emitted through the emission port 5 of the head-up display device.

[0107] Specifically, the reflective imaging portion 2 may be a windshield of a vehicle, and the observation area 3 may be an eye box area.

[0108] In some embodiments, the display panel is used to display an image to be displayed while the control module controls each light emitting element based on a target brightness corresponding to each light emitting element.

[0109] The head-up display device further includes an optical element for imaging the image displayed on the display panel into a naked-eye 3D virtual image.

[0110] Specifically, the naked-eye 3D virtual image is a stereoscopic visual image that can be observed by the observer with the naked eye without passing through a filtering device. The above-mentioned optical element is also used to convert the imaging light emitted by the above-mentioned display panel into stereoscopic visual image light that can form a stereoscopic visual image. The stereoscopic visual image light is processed by the amplifying component and then guided to the reflective imaging part of the head-up display device, and is reflected to the observation area by the reflective imaging part, thereby forming a stereoscopic visual image at the imaging position outside the reflective imaging part, that is, the naked-eye 3D virtual image.

[0111] Optionally, the optical element includes: one of a light barrier element, a cylindrical lens and a light source pointing element.

[0112] The light barrier element can be a blocking unit located on the light output path of the display panel, such as a blocking liquid crystal; the blocking unit is used to partially block the imaging light emitted by the display panel, so that the light partially blocked by the blocking unit forms left-eye light received by the left eye and right-eye light received by the right eye of the same viewer, and the left-eye image formed by the left-eye light is different from the right-eye image formed by the right-eye light.

[0113] The cylindrical lens is located on the light output path of the display panel, and is used to refract the imaging light emitted by the display panel so that the imaging light refracted by the cylindrical lens forms left-eye light received by the left eye and right-eye light received by the right eye of the same viewer, and the left-eye image formed by the left-eye light is different from the right-eye image formed by the right-eye light.

[0114] The pointing element is located on the light output path of the display panel. The pointing element converts the imaging light emitted through the display panel into left-eye light and right-eye light respectively. The pointing element emits the left-eye light and the right-eye light respectively in a time sequence. The pointing element is also used to refract the left-eye light and the right-eye light so that the left-eye light and the right-eye light refracted through the pointing element are respectively received by the left eye and the right eye of the same viewer, and the left-eye image formed by the left-eye light is different from the right-eye image formed by the right-eye light.

[0115] The head-up display device of the above embodiment includes the corresponding display device in any of the above embodiments, and has the beneficial effects of the corresponding display device embodiment, which will not be described in detail here.

[0116] Based on the same inventive concept, corresponding to any of the above-mentioned display devices, the present application also provides a backlight control method for a head-up display device, such as Figure 1 and Figure 2 As shown, the head-up display device includes a display panel 10, a backlight source 20 and a control module 30. The display panel 10 includes a plurality of display areas 100, and the backlight source 20 includes a plurality of light-emitting elements 200. The plurality of display areas 100 correspond to the plurality of light-emitting elements 200 one by one. Figure 8 As shown, the above method includes:

[0117] S101 . Determine brightness information corresponding to each display area according to an image to be displayed on a display panel.

[0118] S102: Determine a target brightness corresponding to each light-emitting element according to brightness information corresponding to each display area.

[0119] S103. Control each light emitting element based on the target brightness corresponding to each light emitting element.

[0120] When a display device is used for display, the method provided in the embodiment of the present disclosure determines the target brightness corresponding to each light-emitting element in the backlight source according to the image to be displayed, and controls the light-emitting element according to the target brightness. By controlling each light-emitting element individually, the waste of light caused by lighting up all the light-emitting elements can be avoided, thereby reducing power consumption, improving light utilization and virtual image contrast.

[0121] In some embodiments, the above S101 includes:

[0122] S201 . Determine a pixel group corresponding to each display area according to an image to be displayed on a display panel.

[0123] S202 . Determine brightness information corresponding to each display area according to the pixel value of the pixel group corresponding to each display area.

[0124] In some embodiments, the above S201 includes:

[0125] S301 . Determine the pixel value of each pixel in the pixel group corresponding to each display area according to the image to be displayed on the display panel, and determine the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area.

[0126] S302: Calculate the weighted average of the brightness values ​​of each pixel to obtain brightness information corresponding to each display area.

[0127] In some embodiments, the above method further comprises:

[0128] S1041. When a first target display element in an image to be displayed is distributed in at least two adjacent display areas in a display panel, determine the target brightness of light-emitting elements corresponding to each of the at least two adjacent display areas, wherein the pixel values ​​of each pixel in the first target display element are the same.

[0129] S1042. When the target brightness of the light-emitting elements corresponding to at least two adjacent display areas is different, adjust the pixel value of the pixel of the first target display element located in at least one display area of ​​the at least two adjacent display areas, or adjust the target brightness of the light-emitting elements corresponding to at least one display area of ​​the at least two adjacent display areas, so that the display brightness of the first target display element displayed in the at least two adjacent display areas is consistent.

[0130] In some embodiments, the above S101 includes:

[0131] S401 . Determine a brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area.

[0132] S402: Compare the brightness value of at least one pixel with a preset threshold to obtain a comparison result for each display area.

[0133] S403: Determine brightness information of each display area according to the comparison result of each display area.

[0134] In some embodiments, the above S401 includes:

[0135] Determine the maximum value among the brightness values ​​of the pixels.

[0136] The above S402 includes:

[0137] The maximum value is compared with the preset threshold to obtain the comparison result of each display area.

[0138] The above S403 includes:

[0139] When the comparison result is that the maximum value is greater than the preset threshold, the brightness information of the display area is determined as the first brightness information; or, when the comparison result is that the maximum value is less than or equal to the preset threshold, the brightness information of the display area is determined as the second brightness information, wherein the target brightness corresponding to the light-emitting element determined according to the first brightness information is higher than the target brightness corresponding to the light-emitting element determined according to the second brightness information.

[0140] In some embodiments, the pixel value of each pixel in the pixel group corresponding to each display area includes an RGB value, and the above S101 includes:

[0141] S501 determines the brightness information of the display area as third brightness information when the RGB value of each pixel in the pixel group corresponding to the display area is greater than the preset RGB value; or determines the brightness information of the display area as fourth brightness information when the RGB value of each pixel in the pixel group corresponding to the display area is less than or equal to the preset RGB value, wherein the target brightness corresponding to the light-emitting element determined according to the third brightness information is higher than the target brightness corresponding to the light-emitting element determined according to the fourth brightness information.

[0142] In some embodiments, the above method further comprises:

[0143] S105. According to the image to be displayed on the display panel, it is determined that the distance between the first part of the second target display element and the center of the first display area is less than a preset distance threshold, the second part of the second target display element is located at the junction of the second display area and the third display area, and the target brightness of the light-emitting elements corresponding to one of the second display area and the third display area is zero, and the target brightness of the light-emitting elements corresponding to the other display area is a fifth brightness greater than zero, and the target brightness of the light-emitting elements with a target brightness of zero among the light-emitting elements corresponding to the second display area and the third display area is adjusted to a sixth brightness greater than zero.

[0144] In some embodiments, the sixth brightness is a brightness value determined based on the fifth brightness and is less than or equal to the fifth brightness; or, the sixth brightness is a preset brightness value; or, the sixth brightness is a brightness value determined based on the distance between the first part of the second target display element and the center of the first display area, and the corresponding relationship between the distance and the brightness value.

[0145] In some embodiments, the above method further comprises:

[0146] S1061. Determine a brightness adjustment value corresponding to each light-emitting element according to the external environment brightness.

[0147] S1062: Control each light emitting element based on the target brightness and brightness adjustment value corresponding to each light emitting element.

[0148] The method of the above embodiment is used to implement the corresponding display device or head-up display device in any of the above embodiments, and has the beneficial effects of the corresponding display device or head-up display device embodiment, which will not be repeated here.

[0149] It should be noted that the method of the embodiment of the present application can be performed by a single device, such as a computer or server. The method of this embodiment can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In the case of such a distributed scenario, one of the multiple devices can only perform one or more steps in the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the above method.

[0150] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0151] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the above elements.

[0152] The above are only specific embodiments of the present disclosure, which enable those skilled in the art to understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described above, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display device, characterized in that: The device comprises a display panel, a backlight source and a control module, wherein the display panel comprises a plurality of display areas, the backlight source comprises a plurality of light-emitting elements, the plurality of display areas correspond to the plurality of light-emitting elements one by one, and the control module is used for: Determining brightness information corresponding to each of the display areas according to an image to be displayed on the display panel; Determining a target brightness corresponding to each of the light-emitting elements according to the brightness information corresponding to each of the display areas; Each of the light emitting elements is controlled based on the target brightness corresponding to each of the light emitting elements.

2. The display device according to claim 1, characterized in that The control module is specifically used for: Determining a pixel group corresponding to each of the display areas according to an image to be displayed on the display panel; The brightness information corresponding to each of the display areas is determined according to the pixel values ​​of the pixel groups corresponding to each of the display areas.

3. The display device according to claim 2, characterized in that: The control module is specifically used for: Determining the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area; A weighted average of the brightness values ​​of the pixels is calculated to obtain the brightness information corresponding to each of the display areas.

4. The display device according to claim 2, characterized in that: The control module is also used for: In a case where a first target display element in the image to be displayed is distributed in at least two adjacent display areas in the display panel, determining target brightness of light-emitting elements corresponding to the at least two adjacent display areas, wherein pixel values ​​of pixels in the first target display element are the same; When the target brightness of the light-emitting elements corresponding to the at least two adjacent display areas is different, adjust the pixel value of the pixel of the first target display element located in at least one display area of ​​the at least two adjacent display areas, or adjust the target brightness of the light-emitting elements corresponding to at least one display area of ​​the at least two adjacent display areas, so that the display brightness of the first target display element displayed in the at least two adjacent display areas is consistent.

5. The display device according to claim 2, characterized in that: The control module is specifically used for: Determining the brightness value of each pixel according to the pixel value of each pixel in the pixel group corresponding to each display area; Comparing the brightness value of at least one pixel with a preset threshold value to obtain a comparison result for each of the display areas; The brightness information of each display area is determined according to the comparison result of each display area.

6. The display device according to claim 5, characterized in that: The control module is specifically used for: Determine the maximum value among the brightness values ​​of the pixels; Comparing the maximum value with the preset threshold value to obtain a comparison result for each display area; When the comparison result shows that the maximum value is greater than the preset threshold, determining the brightness information of the display area as the first brightness information; Alternatively, when the comparison result is that the maximum value is less than or equal to the preset threshold, the brightness information of the display area is determined as second brightness information, wherein the target brightness corresponding to the light-emitting element determined according to the first brightness information is higher than the target brightness corresponding to the light-emitting element determined according to the second brightness information.

7. The display device according to claim 2, characterized in that: The pixel value of each pixel in the pixel group corresponding to each display area includes an RGB value; The control module is specifically used for: When the RGB value of each pixel in the pixel group corresponding to the display area is greater than a preset RGB value, determining the brightness information of the display area as third brightness information; Alternatively, when the RGB value of each pixel in the pixel group corresponding to the display area is less than or equal to a preset RGB value, the brightness information of the display area is determined as fourth brightness information, wherein the target brightness corresponding to the light-emitting element determined according to the third brightness information is higher than the target brightness corresponding to the light-emitting element determined according to the fourth brightness information.

8. The display device according to claim 1, characterized in that: The control module is also used for: According to the image to be displayed on the display panel, it is determined that the distance between the first part of the second target display element and the center of the first display area is less than a preset distance threshold, the second part of the second target display element is located at the junction of the second display area and the third display area, and the target brightness of the light-emitting element corresponding to one of the second display area and the third display area is zero, and the target brightness of the light-emitting element corresponding to the other display area is a fifth brightness greater than zero, and the target brightness of the light-emitting element with a target brightness of zero among the light-emitting elements corresponding to the second display area and the third display area is adjusted to a sixth brightness greater than zero.

9. The display device according to claim 8, characterized in that: The sixth brightness is a brightness value determined based on the fifth brightness and is less than or equal to the fifth brightness; or, the sixth brightness is a preset brightness value; or, the sixth brightness is a brightness value determined based on the distance between the first part of the second target display element and the center of the first display area, and the corresponding relationship between the distance and the brightness value.

10. The display device according to claim 1, characterized in that The control module is specifically used for: Determine the brightness adjustment value corresponding to each light emitting element according to the external environment brightness; Each of the light emitting elements is controlled based on the target brightness and the brightness adjustment value corresponding to each of the light emitting elements.

11. A head-up display device, characterized in that: It comprises the display device according to any one of claims 1 to 10 and a reflective imaging unit, wherein the reflective imaging unit is located on the light-emitting side of the display device and is configured to reflect imaging light emitted by the display device to an observation area of ​​the head-up display device.

12. The head-up display device according to claim 11, characterized in that: The display panel is used for displaying the image to be displayed while the control module controls each of the light emitting elements based on the target brightness corresponding to each of the light emitting elements; The head-up display device further includes an optical element for imaging the image displayed on the display panel into a naked-eye 3D virtual image.

13. A backlight control method for a head-up display device, characterized in that: The head-up display device includes a display panel, a backlight source and a control module, the display panel includes a plurality of display areas, the backlight source includes a plurality of light-emitting elements, the plurality of display areas correspond to the plurality of light-emitting elements one by one, and the method includes: Determining brightness information corresponding to each of the display areas according to an image to be displayed on the display panel; Determining the target brightness corresponding to each of the light-emitting elements according to the brightness information corresponding to each of the display areas; Each of the light emitting elements is controlled based on the target brightness corresponding to each of the light emitting elements.

Images