Display device and control method thereof, head-up display and traffic equipment

Abstract

The invention relates to a display device and a control method thereof, a head-up display and traffic equipment. The display device comprises a display panel, a backlight source and a control module, the backlight source comprises optical waveguide elements and a plurality of light-emitting elements, and light emitted by the light-emitting elements is coupled into the corresponding optical waveguide elements and is coupled out through the corresponding optical waveguide elements to form irradiation areas of the light-emitting elements. The control module is used for determining a target display area of the display panel according to picture content in a picture to be displayed, and determining a target light-emitting element corresponding to the target display area; and based on the target light-emitting element, adjusting the light-emitting states of at least part of the light-emitting elements in the plurality of light-emitting elements. According to the display device provided by the invention, part of the light-emitting elements in all the light-emitting elements can be independently controlled, so that the light-emitting states of the part of the light-emitting elements can be flexibly adjusted in a targeted manner, light waste caused by turning on all the light-emitting elements is avoided, and the utilization rate of light is improved while energy is saved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of display devices, and in particular to a display device and a control method thereof, a head-up display, and traffic equipment. Background Art

[0002] In the related technologies of HUD (head up display), the display area that needs to be used at the same time often only occupies a very small part of the display area of ​​the display panel (for example, when the display area of ​​the display panel is divided into 4×4 areas, the content to be displayed by the display panel only requires a 1×1 area). However, when the display panel displays content, no matter how large an area of ​​the display area of ​​the display panel the display content occupies, a backlight needs to be provided for the entire display area of ​​the display panel. As a result, most of the light provided by the backlight will be converted into useless heat energy, which increases the power consumption of the display device and reduces the utilization rate of light. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure provides a display device and a control method thereof, a head-up display and a traffic equipment.

[0004] The present disclosure provides a display device, including a display panel, a backlight source and a control module, wherein the display panel is located at the light emitting side of the backlight source, the backlight source includes an optical waveguide array and a plurality of light emitting elements, wherein the optical waveguide array includes a plurality of optical waveguide elements, the optical waveguide element corresponds to at least one of the light emitting elements, the light emitted by the light emitting element is coupled into the corresponding optical waveguide element and coupled out through the corresponding optical waveguide element to form an irradiation area of ​​the light emitting element, and the control module is used to: determine a target display area of ​​the display panel according to the content of a picture to be displayed; determine a target light emitting element corresponding to the target display area according to the relative positional relationship between the display panel and the irradiation areas of the plurality of light emitting elements; and adjust the luminous state of at least some of the plurality of light emitting elements based on the target light emitting element.

[0005] Optionally, the target display area is an area on the display panel corresponding to the picture content in the picture to be displayed; the control module is specifically used to turn on the target light-emitting element, or adjust the light brightness of the target light-emitting element; the control module is also specifically used to turn off non-target light-emitting elements among the multiple light-emitting elements except the target light-emitting element, or adjust the light brightness of the non-target light-emitting elements.

[0006] Optionally, all the optical waveguide elements in the optical waveguide array are arranged in sequence along a first direction on the light incident side of the display panel and extend along a second direction intersecting the first direction.

[0007] Optionally, the control module is specifically configured to: determine all light-emitting elements among the multiple light-emitting elements whose illumination areas overlap with the target display area, and determine all the determined light-emitting elements as the target light-emitting elements.

[0008] Optionally, the first direction is perpendicular to the second direction; each of the optical waveguide elements includes a light emitting surface and a transflective element array, and the transflective element array includes a plurality of transflective elements; the light emitting element is configured so that the light emitted by it undergoes a plurality of total reflections at least at the light emitting surface of the corresponding optical waveguide element after entering the corresponding optical waveguide element and is sequentially propagated to the plurality of transflective elements of the transflective element array, a portion of the light propagated to each transflective element of the transflective element array is reflected by the transflective element out of the light emitting surface of the optical waveguide element and then is incident on the display panel, and another portion of the light propagated to each transflective element of the transflective element array passes through the transflective element and then continues to propagate in the optical waveguide element.

[0009] Optionally, the optical waveguide array includes a first optical waveguide array and a second optical waveguide array, wherein the plurality of optical waveguide elements in the first optical waveguide array are arranged in sequence along a first direction on the light incident side of the display panel and extend along a second direction intersecting the first direction, and the plurality of optical waveguide elements in the second optical waveguide array are arranged in sequence along the second direction on the light incident side of the display panel and extend along the first direction, the first optical waveguide array and the second optical waveguide array are stacked, and the second optical waveguide array is located between the first optical waveguide array and the display panel.

[0010] Optionally, the display device is specifically used to determine all the light-emitting elements whose irradiation areas overlap with the target display area among the light-emitting elements corresponding to each of the multiple optical waveguide elements in the first optical waveguide array, and determine all the determined light-emitting elements as first preliminary light-emitting elements; determine all the light-emitting elements whose irradiation areas overlap with the target display area among the light-emitting elements corresponding to each of the multiple optical waveguide elements in the second optical waveguide array, and determine all the determined light-emitting elements as second preliminary light-emitting elements; when the number of the first preliminary light-emitting elements is greater than the number of the second preliminary light-emitting elements, all the second preliminary light-emitting elements are determined as the target light-emitting elements; or, when the number of the first preliminary light-emitting elements is less than the number of the second preliminary light-emitting elements, all the first preliminary light-emitting elements are determined as the target light-emitting elements; or, when the number of the first preliminary light-emitting elements is equal to the number of the second preliminary light-emitting elements, all the first preliminary light-emitting elements or all the second preliminary light-emitting elements are determined as the target light-emitting elements.

[0011] Optionally, the first direction is perpendicular to the second direction; each of the optical waveguide elements in the first optical waveguide array includes a first light emitting surface and a first transflective element array, and the first transflective element array includes a plurality of first transflective elements; the light emitting element on the light incident side of each of the optical waveguide elements in the first optical waveguide array is configured so that the light emitted by it undergoes multiple total reflections at least at the first light emitting surface of the corresponding optical waveguide element after entering the corresponding optical waveguide element and is sequentially propagated to the plurality of first transflective elements of the first transflective element array, a portion of the light propagated to each first transflective element of the first transflective element array is reflected by the first transflective element out of the first light emitting surface and then enters the second optical waveguide array, and is transmitted through the optical waveguide elements in the second optical waveguide array and then enters the display panel, and another portion of the light propagated to each first transflective element of the first transflective element array After partially transmitting through the first reflective element, the light continues to propagate in the corresponding optical waveguide element; each of the optical waveguide elements in the second optical waveguide array includes a second light emitting surface and a second reflective element array, and the second reflective element array includes a plurality of second reflective elements; the light emitting element on the light incident side of each optical waveguide element in the second optical waveguide array is configured so that the light emitted by it undergoes multiple total reflections at least at the second light emitting surface of the corresponding optical waveguide element after entering the corresponding optical waveguide element and propagates to the plurality of second reflective elements of the second reflective element array in sequence, a portion of the light propagating to each second reflective element of the second reflective element array is reflected by the second reflective element out of the second light emitting surface of the corresponding optical waveguide element and then enters the display panel, and another portion of the light propagating to each reflective element of the reflective element array transmits through the reflective element and continues to propagate in the optical waveguide element.

[0012] The present disclosure also provides a head-up display, comprising a display device as described in any one of the 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.

[0013] The present disclosure also provides a traffic device, comprising the head-up display.

[0014] The present disclosure also provides a control method for a display device, wherein the display device includes a display panel, a backlight source and a control module, wherein the display panel is located at a light emitting side of the backlight source, and the backlight source includes an optical waveguide array and a plurality of light emitting elements, wherein the optical waveguide array includes a plurality of optical waveguide elements, and the optical waveguide element corresponds to at least one of the light emitting elements, and light emitted by the light emitting element is coupled into the corresponding optical waveguide element and coupled out through the corresponding optical waveguide element to form an illumination area of ​​the light emitting element, and the method includes: determining a target display area of ​​the display panel according to the content of a picture to be displayed; determining a target light emitting element corresponding to the target display area according to a relative positional relationship between the illumination areas of the display panel and the plurality of light emitting elements; and adjusting the light emitting state of at least some of the plurality of light emitting elements based on the target light emitting element.

[0015] Optionally, the target display area is an area on the display panel corresponding to the picture content in the picture to be displayed; adjusting the light-emitting state of at least some of the multiple light-emitting elements based on the target light-emitting element specifically includes: turning on the target light-emitting element, or adjusting the light-emitting brightness of the target light-emitting element; adjusting the light-emitting state of at least some of the multiple light-emitting elements based on the target light-emitting element specifically also includes: turning off non-target light-emitting elements among the multiple light-emitting elements except the target light-emitting element, or adjusting the light-emitting brightness of the non-target light-emitting elements.

[0016] Optionally, all the optical waveguide elements in the optical waveguide array are arranged in sequence along a first direction on the light incident side of the display panel and extend along a second direction intersecting the first direction; determining the target light-emitting elements corresponding to the target display area according to the relative positional relationship between the display panel and the illumination areas of the multiple light-emitting elements specifically includes: determining all the light-emitting elements among the multiple light-emitting elements whose illumination areas overlap with the target display area, and determining all the determined light-emitting elements as the target light-emitting elements.

[0017] Optionally, the optical waveguide array includes a first optical waveguide array and a second optical waveguide array, wherein the plurality of optical waveguide elements in the first optical waveguide array are sequentially arranged along a first direction on the light incident side of the display panel and extend along a second direction intersecting the first direction, and the plurality of optical waveguide elements in the second optical waveguide array are sequentially arranged along the second direction on the light incident side of the display panel and extend along the first direction, the first optical waveguide array and the second optical waveguide array are stacked, and the second optical waveguide array is located between the first optical waveguide array and the display panel; determining the target light-emitting element corresponding to the target display area according to the relative positional relationship between the display panel and the illumination areas of the plurality of light-emitting elements specifically includes: determining the light-emitting elements corresponding to each of the plurality of light-emitting elements in the first optical waveguide array whose illumination areas overlap with the target display area all light-emitting elements, and determine all the determined light-emitting elements as first preliminary light-emitting elements; determine all the light-emitting elements whose irradiation areas overlap with the target display area among the light-emitting elements corresponding to the plurality of optical waveguide elements in the second optical waveguide array, and determine all the determined light-emitting elements as second preliminary light-emitting elements; when the number of the first preliminary light-emitting elements is greater than the number of the second preliminary light-emitting elements, determine all the second preliminary light-emitting elements as the target light-emitting elements; or, when the number of the first preliminary light-emitting elements is less than the number of the second preliminary light-emitting elements, determine all the first preliminary light-emitting elements as the target light-emitting elements; or, when the number of the first preliminary light-emitting elements is equal to the number of the second preliminary light-emitting elements, determine all the first preliminary light-emitting elements or all the second preliminary light-emitting elements as the target 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 individually control some of the light-emitting elements among all the light-emitting elements, so that the light-emitting states of some of the light-emitting elements can be flexibly adjusted in a targeted manner, avoiding the waste of light caused by turning on all the light-emitting elements, thereby improving the utilization rate of light while saving energy. 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 cross-sectional structure of a display device provided in an embodiment of the present disclosure;

[0022] Figure 2 A schematic diagram of a planar structure of a backlight source provided in an embodiment of the present disclosure;

[0023] Figure 3 A schematic diagram of a planar structure of another backlight source provided by an embodiment of the present disclosure;

[0024] Figure 4 A schematic diagram of a planar structure of another backlight source provided by an embodiment of the present disclosure;

[0025] Figure 5 A schematic diagram of the three-dimensional structure of another backlight source provided in an embodiment of the present disclosure;

[0026] Figure 6 A schematic diagram of a partial cross-sectional structure of another display device provided by an embodiment of the present disclosure;

[0027] Figure 7 A schematic diagram of a partial cross-sectional structure of a collimation structure provided in an embodiment of the present disclosure;

[0028] Figure 8 A schematic diagram of a partial cross-sectional structure of a light recycling structure provided by an embodiment of the present disclosure;

[0029] Fig. 9 A schematic diagram of a partial cross-sectional structure of a head-up display provided in an embodiment of the present disclosure;

[0030] Fig.10 A schematic flow chart of a method for controlling a display device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] An embodiment of the present disclosure provides a display device, such as Figure 1 As shown ( Figure 12 is a partial cross-sectional structural diagram of a display panel and a backlight source plane, comprising a display panel 10, a backlight source 20 and a control module 30. The display panel 10 is located on the light emitting side of the backlight source 20, that is, on the light emitting surface 211 side. Figure 1 and Figure 2 As shown ( Figure 2 This is a schematic diagram of the planar structure of a backlight source in a specific embodiment, and does not limit the structure of all backlight sources to Figure 2 ), the backlight source 20 includes an optical waveguide array 200 and a plurality of light emitting elements 100, wherein the optical waveguide array 200 includes a plurality of optical waveguide elements 201, the optical waveguide element 201 corresponds to at least one light emitting element 100, the light emitting element 100 is located at the light incident side of the corresponding optical waveguide element 201, the light emitted by the light emitting element 100 is coupled into the corresponding optical waveguide element 201 and coupled out through the corresponding optical waveguide element 201 to form an irradiation area of ​​the light emitting element 100, specifically, the control module 30 is connected to all the light emitting elements 100, and is used to:

[0034] The target display area of ​​the display panel is determined according to the picture content in the picture to be displayed.

[0035] Specifically, the picture to be displayed is the picture to be displayed on the display panel. The target display area is the display area on the display panel determined according to the position of the picture content in the picture to be displayed. Determining the target display area means obtaining which areas on the display panel have the picture content to be displayed, so as to facilitate the subsequent targeted adjustment of the state of the light-emitting element in the backlight source according to the target display area.

[0036] The target light emitting element corresponding to the target display area is determined according to the relative position relationship between the display panel and the illumination areas of the plurality of light emitting elements.

[0037] Specifically, the display panel includes a display surface (or light emitting surface) and a back surface (or light incident surface) opposite to the display surface, and the display surface forms the display area of ​​the display panel. The light emitted by the backlight source (also called light source light) is incident on the back of the display panel, and after being converted into image light by the display panel, it is emitted from the display surface, so that the picture content can be displayed on the display panel.

[0038] The irradiation area of ​​the light-emitting element, that is, when the light-emitting element emits light, the area that can be covered by the light emitted by it after being coupled out by the corresponding optical waveguide element. The irradiation areas of multiple light-emitting elements jointly cover the back of the display panel, for example, the projection area of ​​all irradiation areas formed by multiple light-emitting elements on the display panel covers the back of the display panel. Optionally, the projection area of ​​all irradiation areas formed by multiple light-emitting elements on the display panel covers the back of the display panel, and the area of ​​the projection area is equal to the back area of ​​the display panel. Usually, there is only part of the image content in the image to be displayed, so the display area of ​​the display panel can be divided into a target display area and other display areas except the target display area. The target display area is the area on the display panel corresponding to the image content in the image to be displayed. When the image to be displayed is displayed, the image content therein occupies the target display area, and there is no corresponding image content to be displayed in other display areas, that is, the target display area is the area where the image content will be displayed, and no image content will be displayed in other areas. The target light-emitting element is determined according to whether the irradiation area of ​​each light-emitting element constitutes the target display area or overlaps with the target display area.

[0039] Based on the target light emitting element, the light emitting state of at least part of the plurality of light emitting elements is adjusted.

[0040] Since each light-emitting element can be controlled individually, regional regulation of the backlight can be achieved.

[0041] The display device provided by the embodiment of the present disclosure can individually control some of the light-emitting elements among all the light-emitting elements when displaying, so that the light-emitting states of some of the light-emitting elements can be flexibly adjusted in a targeted manner, avoiding the waste of light caused by turning on all the light-emitting elements, thereby improving the utilization rate of light while saving energy.

[0042] Any connection method that enables the control module to control the light-emitting element and adjust the state of the light-emitting element can be applied to the embodiments of the present disclosure and will not be further limited herein.

[0043] In some embodiments, the target display area is an area on the display panel corresponding to the content of the picture to be displayed. The control module is specifically used to turn on the target light-emitting element, or adjust the light brightness of the target light-emitting element. In a more specific embodiment, the control module is specifically used to determine the light brightness of each target light-emitting element according to the content of the picture to be displayed, and control each target light-emitting element to emit light at a corresponding light brightness.

[0044] After the area corresponding to the screen content on the display panel is determined as the target display area, the control module can only turn on the target light-emitting element corresponding to the target display area, further improving the utilization rate of light and achieving the effect of energy saving and power saving. At the same time, the light brightness of each target light-emitting element can also be determined according to the screen content to be displayed, so as to finely control the backlight of the display panel.

[0045] The control module is also specifically used to turn off non-target light-emitting elements other than the target light-emitting elements among multiple light-emitting elements, or to adjust the light brightness of the non-target light-emitting elements. In a more specific embodiment, the above-mentioned control module is specifically used to lower the light brightness of the non-target light-emitting elements.

[0046] After the area corresponding to the screen content on the display panel is determined as the target display area, the brightness of non-target light-emitting elements can be lowered through the control module, or the target light-emitting elements corresponding to the non-target display area can be turned off, thereby further improving the utilization rate of light and achieving the effect of energy saving and power saving.

[0047] In some embodiments, the control module can turn on the target light-emitting element and turn off the non-target light-emitting elements except the target light-emitting element among the multiple light-emitting elements; or turn on the target light-emitting element and reduce the light-emitting brightness of the non-target light-emitting elements; or control each target light-emitting element to emit light with a corresponding light-emitting brightness and turn off the non-target light-emitting elements except the target light-emitting element among the multiple light-emitting elements; or control each target light-emitting element to emit light with a corresponding light-emitting brightness and reduce the light-emitting brightness of the non-target light-emitting elements.

[0048] The present disclosure provides a display device with two backlight source structures. In one embodiment, the backlight source structure is as follows: Figure 2 As shown, all the optical waveguide elements 201 in the optical waveguide array 200 are sequentially arranged along a first direction Z on the light incident side of the display panel and extend along a second direction X intersecting the first direction Z.

[0049] Figure 2 The embodiment shows eight optical waveguide elements, corresponding to which there are eight groups of light emitting elements 11 to 18. Each group of light emitting elements includes at least one light emitting element, and all light emitting elements in each group of light emitting elements correspond to one optical waveguide element. For example, each group of light emitting elements includes one light emitting element, and each light emitting element corresponds to one optical waveguide element. Figure 2 The structural range of each optical waveguide element shown can be regarded as the irradiation area of ​​the corresponding light emitting element.

[0050] Optionally, the area occupied by each optical waveguide element on the xz plane overlaps with the illumination area formed by the light-emitting element corresponding to the optical waveguide element, for example, the area occupied by each optical waveguide element on the xz plane is the same as the illumination area formed by the light-emitting element corresponding to the optical waveguide element.

[0051] In specific implementation, the illumination areas of the light-emitting elements do not completely overlap, preferably do not overlap. The illumination areas of all light-emitting elements jointly cover the back of the display panel, or are consistent with the back of the display panel. The display panel includes a display surface and a back surface opposite to the display surface. The light coupled out of the optical waveguide is incident on the back surface and emitted from the display surface to display the content of the picture on the display surface. The definition of the illumination area in other parts of the embodiments of the present disclosure is similar and will not be repeated.

[0052] In specific implementation, when there is only one light emitting element in each light emitting element group, regional control of the backlight can be achieved. In order to save computing resources, each light emitting element group may also include multiple light emitting elements. The light emitting elements in other parts of the embodiment of the present disclosure are similar and will not be described in detail.

[0053] In the above embodiment, the control module is specifically used for:

[0054] All light-emitting elements whose illumination areas overlap with the target display area among the plurality of light-emitting elements are determined, and all the determined light-emitting elements are determined as target light-emitting elements.

[0055] If the illumination area of ​​a light-emitting element overlaps with the target display area, the light-emitting element is necessary, and other light-emitting elements whose illumination areas do not overlap with the target display area can be turned off to improve light utilization. In addition, if each display area corresponds to only one illumination area, the light-emitting element whose illumination area overlaps with the target display area can be directly determined as the target light-emitting element.

[0056] When implementing it, Figure 2 As shown, it can be determined that the illumination areas of the light-emitting elements 12, 13, 14 overlap with the target display area 500, so the light-emitting elements 12, 13, 14 are determined as target light-emitting elements, and only the light-emitting elements 12, 13, 14 are turned on or only the light-emitting elements 12, 13, 14 are controlled to emit light at the corresponding display brightness, thereby further reducing power consumption and improving light utilization.

[0057] In some embodiments, the first direction is perpendicular to the second direction. Figure 1 and Figure 2As shown, each optical waveguide element 201 includes a waveguide medium 210, a light emitting surface 211, a backlight surface 212 and a transflective element array 220, and the transflective element array 220 includes a plurality of transflective elements 221; the light emitting element 100 is configured so that the light emitted by it, after entering the corresponding optical waveguide element 201 from the coupling-in portion 230, undergoes a plurality of total reflections at least at the light emitting surface 211 of the corresponding optical waveguide element 201 and sequentially propagates to the plurality of transflective elements 221 of the transflective element array 220, a portion of the light propagating to each transflective element 221 of the transflective element array 220 is reflected by the transflective element 221 out of the light emitting surface 211 of the optical waveguide element 201 and then enters the display panel 10, and another portion of the light propagating to each transflective element 221 of the transflective element array 220 passes through the transflective element 221 and then continues to propagate in the optical waveguide element 201.

[0058] In a specific embodiment, Figure 1 As shown, the angle between each transflective element 221 and the light emitting surface 211 is a first angle, and the sum of the first angle and the critical angle of total reflection at which the light is totally reflected on the light emitting surface 211 is in the range of 60° to 120°. For example, the sum of the first angle and the critical angle of total reflection is in the range of 70° to 120°. For example, the sum of the first angle and the critical angle of total reflection is in the range of 80° to 100°. For example, the sum of the first angle and the critical angle of total reflection is in the range of 85° to 95°.

[0059] The embodiment of the present disclosure sets the sum of the first angle between the transflective element and the light emitting surface and the critical angle of total reflection when the light is totally reflected on the light emitting surface. For the same path of light, the light can be reflected only once in each transflective element, such as avoiding the transmission and reflection of light parallel or nearly parallel to the transflective element on it, thereby improving the uniformity of the light and reducing or avoiding the generation of stray light.

[0060] In a specific embodiment, Figure 1 As shown, along the direction of total reflection propagation of light in the waveguide medium 210, multiple transflective elements 221 are evenly arranged and the reflectivity gradually increases. Here, "total reflection propagation direction of light" can refer to the overall (macroscopic) direction of light propagation, for example, Figure 2 In the second direction (i.e., the X direction) shown, the light entering the optical waveguide element 201 undergoes total internal reflection at the two main surfaces of the waveguide medium 210 (i.e., the light emitting surface and the backlight surface 212 opposite to the light emitting surface), so that the light is propagated as a whole along the X direction to the transflective element array 220.

[0061] For example, the closer the transflective element 221 is to the light emitting element 100, the smaller its reflectivity. For example, the reflectivity of the transflective elements 221 arranged in sequence along the extension direction of the light emitting surface 211 in the transflective element array 220 gradually increases in the propagation direction of the light or gradually increases regionally. For example, the arrangement density of the transflective elements 221 arranged in sequence along the extension direction of the light emitting surface 211 in the transflective element array 220 gradually increases or gradually increases regionally. The reflectivity of the transflective elements 221 may be the same, or the reflectivity may gradually increase. For example, the regional increase may be two or more regions, and the reflectivity of the transflective elements in the above different regions is different and gradually increases, or the reflectivity is the same.

[0062] The above-mentioned uniform arrangement can refer to an arrangement in which adjacent transflective elements are arranged so that their orthographic projections are connected to each other, or an arrangement in which adjacent transflective elements are arranged so that their orthographic projections partially overlap. Since light will gradually reflect out of the waveguide medium during propagation, the light intensity will gradually decay. Therefore, by setting the transflective properties of each transflective element differently, for example, along the path of total reflection propagation of light, the reflectivity of the transflective element gradually increases, the intensity of light reflected by each transflective element can be made more uniform, and the light output from each part of the waveguide medium can be made more uniform.

[0063] In one embodiment, the backlight structure is as follows Figures 3 to 6 As shown, the optical waveguide array includes Figure 3 The first optical waveguide array 300 and Figure 4 In the second optical waveguide array 400 shown in FIG. 1 , the plurality of optical waveguide elements 301 in the first optical waveguide array 300 are sequentially arranged along a first direction Z on the light incident side of the display panel and extend along a second direction X intersecting the first direction Z. The plurality of optical waveguide elements 401 in the second optical waveguide array 400 are sequentially arranged along the second direction X on the light incident side of the display panel and extend along the first direction Z. Figure 5 and Figure 6 As shown ( Figure 6 For Figure 5 A schematic diagram of a partial cross-sectional structure of a display device corresponding to an embodiment, wherein, in order to facilitate the display of the arrangement of the optical waveguide elements 401 in the second optical waveguide array 400, Figure 5 Not shown Figure 6 The display panel 10, the control module 30 and the light emitting element 100 are arranged in a stacked manner, and the second light waveguide array 400 is located between the first light waveguide array 300 and the display panel 10.

[0064] Figure 3 and Figure 4The embodiment shows eight optical waveguide elements 301 in the first optical waveguide array 300 and five optical waveguide elements 401 in the second optical waveguide array 400, corresponding to 13 groups of light emitting elements Z1 to Z8, X1 to X5. In this embodiment, the display area on the display panel corresponds to two groups of illumination areas, namely, the illumination area of ​​the light emitting elements on the light incident side of the first optical waveguide array and the illumination area of ​​the light emitting elements on the light incident side of the second optical waveguide array. However, for a certain display area, such as a target display area, it is only necessary to turn on the light emitting elements corresponding to one group of illumination areas to complete the display of the target display area. This structural setting has high flexibility.

[0065] Optionally, the illumination areas of all the light-emitting elements on the light-entering side of the first light waveguide array jointly cover the back side of the display panel, for example, the projection areas of all the illumination areas formed by all the light-emitting elements on the light-entering side of the first light waveguide array on the display panel cover the back side of the display panel. Optionally, the projection areas of all the illumination areas formed by all the light-emitting elements on the light-entering side of the first light waveguide array on the display panel cover the back side of the display panel, and the area of ​​the projection areas is equal to the area of ​​the back side of the display panel.

[0066] The illumination areas of all the light-emitting elements on the light-entering side of the second light waveguide array jointly cover the back side of the display panel, for example, the projection areas of all the illumination areas formed by all the light-emitting elements on the light-entering side of the second light waveguide array on the display panel cover the back side of the display panel. Optionally, the projection areas of all the illumination areas formed by all the light-emitting elements on the light-entering side of the second light waveguide array on the display panel cover the back side of the display panel, and the area of ​​the projection areas is equal to the area of ​​the back side of the display panel.

[0067] In this embodiment, the display device is specifically used for:

[0068] Among the light emitting elements corresponding to the plurality of light waveguide elements in the first light waveguide array, all the light emitting elements whose irradiation areas overlap with the target display area are determined, and all the determined light emitting elements are determined as first preliminary light emitting elements.

[0069] exist Figure 3 In the illustrated embodiment, the first preliminary light emitting elements are Z3, Z4, and Z5.

[0070] Among the light emitting elements corresponding to the plurality of light waveguide elements in the second light waveguide array, all the light emitting elements whose irradiation areas overlap with the target display area are determined, and all the determined light emitting elements are determined as second spare light emitting elements.

[0071] exist Figure 4 In the illustrated embodiment, the second preliminary light emitting elements are X2 and X3.

[0072] When the number of first preliminary light-emitting elements is greater than the number of second preliminary light-emitting elements, all second preliminary light-emitting elements are determined as target light-emitting elements; or, when the number of first preliminary light-emitting elements is less than the number of second preliminary light-emitting elements, all first preliminary light-emitting elements are determined as target light-emitting elements; or, when the number of first preliminary light-emitting elements is equal to the number of second preliminary light-emitting elements, all first preliminary light-emitting elements or all second preliminary light-emitting elements are determined as target light-emitting elements.

[0073] exist Figure 3 and Figure 4 In the embodiment, only two second preparatory light-emitting elements are needed, while three first preparatory light-emitting elements are needed. Therefore, only the second preparatory light-emitting elements are turned on, which can further reduce power consumption and improve light utilization while ensuring normal display of the picture.

[0074] If the number of the first preliminary light-emitting elements is equal to the number of the second preliminary light-emitting elements, any one of them can be selected. The specific preference for the first preliminary light-emitting elements or the second preliminary light-emitting elements can be determined according to actual needs and is not further limited here.

[0075] In some embodiments, the first direction is perpendicular to the second direction. Each optical waveguide element in the first optical waveguide array includes a first light emitting surface and a first transflective element array, and the first transflective element array includes a plurality of first transflective elements; the light emitting element on the light incident side of each optical waveguide element in the first optical waveguide array is configured so that the light emitted by it undergoes multiple total reflections at least at the first light emitting surface of the corresponding optical waveguide element after entering the corresponding optical waveguide element and propagates to the plurality of first transflective elements of the first transflective element array in sequence, a portion of the light propagating to each first transflective element of the first transflective element array is reflected by the first transflective element out of the first light emitting surface and then incident on the second optical waveguide array, and is transmitted through the optical waveguide elements in the second optical waveguide array and then incident on the display panel, and another portion of the light propagating to each first transflective element of the first transflective element array passes through the first transflective element and continues to propagate in the corresponding optical waveguide element.

[0076] Each optical waveguide element in the second optical waveguide array includes a second light emitting surface and a second transflective element array, and the second transflective element array includes a plurality of second transflective elements; the light emitting element on the light incident side of each optical waveguide element in the second optical waveguide array is configured so that the light emitted by it undergoes multiple total reflections at least at the second light emitting surface of the corresponding optical waveguide element after entering the corresponding optical waveguide element and is sequentially propagated to the plurality of second transflective elements of the second transflective element array, a portion of the light propagated to each second transflective element of the second transflective element array is reflected by the second transflective element out of the second light emitting surface of the corresponding optical waveguide element and then is incident on the display panel, and another portion of the light propagated to each transflective element of the transflective element array passes through the transflective element and continues to propagate in the optical waveguide element.

[0077] The optical waveguide element, the first light emitting surface / the second light emitting surface, the first transflective element array / the second transflective element array, the first transflective element / the second transflective element and other structures in the above embodiments can all be referred to. Figure 1 The optical waveguide element 201, the light emitting surface 211, the transflective element array 220 and the transflective element 221 are not described in detail here.

[0078] In a specific embodiment, reference Figure 1 In the transflective element 221 shown, the angle between the first transflective element and the first light-emitting surface is the first angle, and the sum of the first angle and the critical angle of total reflection at which the light is totally reflected on the first light-emitting surface is in the range of 60° to 120°. For example, the sum of the first angle and the critical angle of total reflection is in the range of 70° to 120°. For example, the sum of the first angle and the critical angle of total reflection is in the range of 80° to 100°. For example, the sum of the first angle and the critical angle of total reflection is in the range of 85° to 95°.

[0079] The angle between the second transflective element and the second light-emitting surface is the second angle, and the sum of the second angle and the critical angle of total reflection at which the light is totally reflected on the second light-emitting surface is in the range of 60° to 120°. For example, the sum of the second angle and the critical angle of total reflection is in the range of 70° to 120°. For example, the sum of the second angle and the critical angle of total reflection is in the range of 80° to 100°. For example, the sum of the second angle and the critical angle of total reflection is in the range of 85° to 95°.

[0080] The embodiment of the present disclosure sets the angle between the transflective element and the light emitting surface and the sum of the critical angle of total reflection when the light is totally reflected on the light emitting surface. For the same light beam, the light beam can be reflected only once in each transflective element. For example, light beams that are parallel or nearly parallel to the transflective element are prevented from being transmitted and reflected on the element. This can improve the uniformity of the light and reduce or avoid the generation of stray light.

[0081] In a specific embodiment, along the direction of total reflection propagation of light in the waveguide medium (i.e., the second direction X), multiple first transflective elements are evenly arranged and the reflectivity gradually increases. For example, the closer the first transflective element is to the light-emitting element, the smaller the reflectivity. For example, the reflectivity of the first transflective elements arranged in sequence along the extension direction of the first light-emitting surface in the first transflective element array gradually increases in the propagation direction of the light or gradually increases regionally.

[0082] Alternatively, the arrangement density of the first transflective elements in the first transflective element array arranged in sequence along the extension direction of the first light emitting surface gradually increases or gradually increases regionally. The reflectivity of the first transflective elements may be the same, or the reflectivity gradually increases. For example, the regional increase may be in two or more regions, and the reflectivity of the first transflective elements in the above different regions is different and gradually increases, or the reflectivity is the same.

[0083] In a specific embodiment, along the direction of total reflection propagation of light in the waveguide medium (i.e., the first direction Z direction), multiple second transflective elements are evenly arranged and the reflectivity gradually increases. For example, the closer the second transflective element is to the light-emitting element, the smaller the reflectivity. For example, the reflectivity of the second transflective elements arranged in sequence along the extension direction of the second light-emitting surface in the second transflective element array gradually increases in the propagation direction of the light or gradually increases regionally.

[0084] Alternatively, the arrangement density of the second transflective elements in the second transflective element array arranged in sequence along the extension direction of the second light emitting surface gradually increases or gradually increases regionally. The reflectivity of the second transflective elements may be the same, or the reflectivity gradually increases. For example, the regional increase may be in two or more regions, and the reflectivity of the second transflective elements in the above different regions is different and gradually increases, or the reflectivity is the same.

[0085] The above-mentioned uniform arrangement can refer to an arrangement in which adjacent transflective elements are arranged so that their orthographic projections are connected to each other, or an arrangement in which adjacent transflective elements are arranged so that their orthographic projections partially overlap. Since light will gradually reflect out of the waveguide medium during propagation, the light intensity will gradually decay. Therefore, by setting the transflective properties of each first transflective element and the second transflective element differently, the intensity of light reflected by each transflective element can be made more uniform, and the light output from each part of the waveguide medium can be made more uniform.

[0086] In some embodiments, Figure 7 As shown, the above-mentioned backlight source also includes:

[0087] The collimating element 50 is used to adjust the emission direction of the light emitted by the light emitting element 100 to within a preset angle range. The collimating element 50 is located between the light emitting element 100 and the optical waveguide element 201 .

[0088] Since the light emitted by the light emitting element (which may be an LED lamp bead in the specific implementation) has a certain divergence angle, the light with a larger divergence angle may not be coupled into the optical waveguide element. Figure 7 As shown, in order to improve the utilization rate of light, a corresponding collimating element can be provided to collimate the light to form collimated light, thereby reducing the divergence angle of the light and improving the utilization rate of the light.

[0089] In some embodiments, Figure 7 As shown, the collimating element 50 includes a lamp cup 51 .

[0090] The lamp cup 51 is a hollow shell surrounded by a reflective surface, and the opening direction of the lamp cup faces the optical waveguide element 201 ; the end of the lamp cup away from the opening is used to arrange the light emitting element 100 .

[0091] In some embodiments, the lamp cup is a total reflector lamp cup or a parabolic reflector lamp cup.

[0092] In some embodiments, Figure 8 As shown, the above-mentioned backlight source further includes a light recycling structure, and the light recycling structure includes:

[0093] The polarization transflective element 61 is used to reflect one polarized light and transmit another polarized light in the output light of the light emitting element.

[0094] exist Figure 8 In the embodiment shown, the polarization transflective element 61 is used to reflect S light and transmit P light. S light is transverse polarized light, and its electric field vibration direction is perpendicular to the light propagation direction; P light is longitudinal polarized light, and its electric field vibration direction is parallel to the light propagation direction.

[0095] The phase delay optical element 62 is used to change the polarization state of the polarized light transmitted by the polarization transflective element.

[0096] exist Figure 8 In the embodiment shown, the phase delay optical element 62 is used to change the polarization state of the P light to make it S light. Correspondingly, in another embodiment, the polarization transflective element 61 is used to reflect the P light and transmit the S light, and the phase delay optical element 62 is used to change the polarization state of the S light to make it P light.

[0097] The reflective element 63 is used to reflect the polarized light reflected by the polarization transflective element.

[0098] The above light recycling structure is located between the collimating element and the light transmitting element. Figure 8 In the illustrated embodiment, the polarization transflective element 61 is located between the phase delay optical element 62 and the collimating element 50 .

[0099] In the related art, some display panels (such as liquid crystal displays) can only use one polarized light in polarized light for imaging, such as the above-mentioned S light or P light, while the other polarized light will be wasted, resulting in low light utilization. In view of this, the above-mentioned embodiments of the present disclosure use a light recycling structure to convert all light into the same polarization state, thereby improving the light utilization.

[0100] Based on the same inventive concept, the embodiment of the present disclosure also provides a head-up display, such as Fig. 9 As shown, it includes a display device 1 of any one 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, 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, 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.

[0101] The head-up display uses the reflective imaging part to reflect the outgoing light of the display device, so that the observer can observe the virtual image formed outside the reflective imaging part and the objects outside the reflective imaging part in the observation area at the same time. In the related art, the light-emitting elements in the backlight of the display panel in the display device are all lit, and the light emitted by the backlight corresponding to the part of the display panel in the display device that does not display the picture content will be blocked and converted into heat through refraction, radiation, absorption, etc., resulting in low light utilization. The display device in the head-up display provided by the embodiment of the present disclosure can control each light-emitting element individually when displaying, and perform local backlight adjustment on the backlight of the display panel, so that the light-emitting state of the local light-emitting element can be flexibly adjusted in a targeted manner, avoiding the waste of light caused by turning on all light-emitting elements as a whole, and improving the utilization of light while saving energy.

[0102] Specifically, Fig. 9 As shown, the head-up display further includes a plane reflector 6 (the plane reflector 6 is optional) and a curved reflector 7, which are used to reflect the image light emitted by the display device 1 to the reflective imaging part 2, wherein the image light is emitted through the emission port 5 of the head-up display.

[0103] Specifically, the reflective imaging portion 2 may be a windshield of a vehicle, and the observation area 3 may be an eye box area.

[0104] Based on the same inventive concept, an embodiment of the present disclosure further provides a traffic device, including the head-up display in the above embodiment.

[0105] Specifically, the above-mentioned traffic equipment can be a car, a battery car, a train, an airplane, a ship, etc. The traffic equipment using the head-up display of the embodiment of the present disclosure can avoid distraction caused by the driver's diverting sight and improve the utilization rate of light.

[0106] Based on the same inventive concept, the embodiment of the present disclosure also provides a control method for a display device, such as Figure 1 As shown, the display device includes a display panel 10, a backlight source 20 and a control module 30, and the display panel 10 is located at the light emitting side of the backlight source 20. Figure 1 and Figure 2 As shown, the backlight source 20 includes a light waveguide array 200 and a plurality of light emitting elements 100, wherein the light waveguide array 200 includes a plurality of light waveguide elements 201, and the light waveguide element 201 corresponds to at least one light emitting element 100, and the light emitted by the light emitting element 100 is coupled into the corresponding light waveguide element 201 and coupled out through the corresponding light waveguide element 201 to form an illumination area of ​​the light emitting element 100, as shown in FIG. Fig.10 As shown, the above method includes:

[0107] S101 : determining a target display area of ​​a display panel according to the content of a picture to be displayed.

[0108] S102 . Determine a target light emitting element corresponding to a target display area according to a relative position relationship between a display panel and illumination areas of a plurality of light emitting elements.

[0109] S103. Based on the target light-emitting element, adjust the light-emitting state of at least part of the plurality of light-emitting elements.

[0110] The method provided in the embodiment of the present disclosure can individually control some of the light-emitting elements among all the light-emitting elements when the display device is displaying, so that the light-emitting states of some of the light-emitting elements can be flexibly adjusted in a targeted manner, avoiding the waste of light caused by turning on all the light-emitting elements, thereby improving the utilization rate of light while saving energy.

[0111] In some embodiments, the target display area is an area on the display panel corresponding to the picture content in the picture to be displayed, and the above S103 specifically includes:

[0112] Turn on the target light-emitting element, or adjust the light brightness of the target light-emitting element.

[0113] The above S103 specifically also includes:

[0114] Turn off non-target light-emitting elements other than the target light-emitting element among the plurality of light-emitting elements, or adjust the light-emitting brightness of the non-target light-emitting elements.

[0115] The present disclosure provides a display device with two backlight source structures. In one embodiment, the backlight source structure is as follows: Figure 2As shown, all the optical waveguide elements 201 in the optical waveguide array 200 are sequentially arranged along a first direction Z on the light incident side of the display panel and extend along a second direction X intersecting the first direction Z. In this embodiment, the above S102 specifically includes:

[0116] All light-emitting elements whose illumination areas overlap with the target display area among the plurality of light-emitting elements are determined, and all the determined light-emitting elements are determined as target light-emitting elements.

[0117] In one embodiment, the backlight structure is as follows Figures 3 to 6 As shown, the optical waveguide array includes Figure 3 The first optical waveguide array 300 and Figure 4 In the second optical waveguide array 400 shown in FIG. 1 , the plurality of optical waveguide elements 301 in the first optical waveguide array 300 are sequentially arranged along a first direction Z on the light incident side of the display panel and extend along a second direction X intersecting the first direction Z. The plurality of optical waveguide elements 401 in the second optical waveguide array 400 are sequentially arranged along the second direction X on the light incident side of the display panel and extend along the first direction Z. Figure 5 and Figure 6 As shown, the first optical waveguide array 300 and the second optical waveguide array 400 are stacked, and the second optical waveguide array 400 is located between the first optical waveguide array 300 and the display panel 10 .

[0118] In this embodiment, the above S102 specifically includes:

[0119] Among the light emitting elements corresponding to the plurality of light waveguide elements in the first light waveguide array, all the light emitting elements whose irradiation areas overlap with the target display area are determined, and all the determined light emitting elements are determined as first preliminary light emitting elements.

[0120] Among the light emitting elements corresponding to the plurality of light waveguide elements in the second light waveguide array, all the light emitting elements whose irradiation areas overlap with the target display area are determined, and all the determined light emitting elements are determined as second spare light emitting elements.

[0121] When the number of first preliminary light-emitting elements is greater than the number of second preliminary light-emitting elements, all second preliminary light-emitting elements are determined as target light-emitting elements; or, when the number of first preliminary light-emitting elements is less than the number of second preliminary light-emitting elements, all first preliminary light-emitting elements are determined as target light-emitting elements; or, when the number of first preliminary light-emitting elements is equal to the number of second preliminary light-emitting elements, all first preliminary light-emitting elements or all second preliminary light-emitting elements are determined as target light-emitting elements.

[0122] The method of the above embodiment is implemented based on 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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 is located at the light-emitting side of the backlight source, the backlight source comprises an optical waveguide array and a plurality of light-emitting elements, wherein the optical waveguide array comprises a plurality of optical waveguide elements, the optical waveguide element corresponds to at least one of the light-emitting elements, the light emitted by the light-emitting element is coupled into the corresponding optical waveguide element and coupled out through the corresponding optical waveguide element to form an irradiation area of ​​the light-emitting element, and the control module is used to: Determining a target display area of ​​the display panel according to the picture content in the picture to be displayed; Determining a target light emitting element corresponding to the target display area according to a relative positional relationship between the display panel and the illumination areas of the plurality of light emitting elements; Based on the target light emitting element, the light emitting state of at least part of the plurality of light emitting elements is adjusted.

2. The display device according to claim 1, characterized in that The target display area is an area on the display panel corresponding to the picture content in the picture to be displayed; The control module is specifically used to turn on the target light-emitting element, or to adjust the light brightness of the target light-emitting element; The control module is specifically further used to turn off non-target light-emitting elements other than the target light-emitting element among the multiple light-emitting elements, or to adjust the light brightness of the non-target light-emitting elements.

3. The display device according to claim 1 or 2, characterized in that: All the optical waveguide elements in the optical waveguide array are arranged in sequence along a first direction on the light incident side of the display panel and extend along a second direction intersecting the first direction.

4. The display device according to claim 3, characterized in that: The control module is specifically used for: All light-emitting elements whose illumination areas overlap with the target display area among the plurality of light-emitting elements are determined, and all the determined light-emitting elements are determined as the target light-emitting elements.

5. The display device according to claim 3, characterized in that: The first direction is perpendicular to the second direction; Each of the optical waveguide elements includes a light emitting surface and a transflective element array, and the transflective element array includes a plurality of transflective elements; the light emitting element is configured so that the light emitted by it undergoes a plurality of total reflections at least at the light emitting surface of the corresponding optical waveguide element after entering the corresponding optical waveguide element and is sequentially propagated to the plurality of transflective elements of the transflective element array, a portion of the light propagated to each transflective element of the transflective element array is reflected by the transflective element out of the light emitting surface of the optical waveguide element and then enters the display panel, and another portion of the light propagated to each transflective element of the transflective element array passes through the transflective element and then continues to propagate in the optical waveguide element.

6. The display device according to claim 1 or 2, characterized in that: The optical waveguide array includes a first optical waveguide array and a second optical waveguide array, wherein a plurality of the optical waveguide elements in the first optical waveguide array are sequentially arranged along a first direction on the light incident side of the display panel and extend along a second direction intersecting the first direction, and a plurality of the optical waveguide elements in the second optical waveguide array are sequentially arranged along the second direction on the light incident side of the display panel and extend along the first direction, the first optical waveguide array and the second optical waveguide array are stacked, and the second optical waveguide array is located between the first optical waveguide array and the display panel.

7. The display device according to claim 6, characterized in that: The display device is specifically used for: Determine all light emitting elements whose illumination areas overlap with the target display area among the light emitting elements corresponding to the plurality of light waveguide elements in the first light waveguide array, and determine all the determined light emitting elements as first preliminary light emitting elements; Determine all light emitting elements whose illumination areas overlap with the target display area among the light emitting elements corresponding to the plurality of light waveguide elements in the second light waveguide array, and determine all the determined light emitting elements as second preliminary light emitting elements; When the number of the first preliminary light-emitting elements is greater than the number of the second preliminary light-emitting elements, all of the second preliminary light-emitting elements are determined as the target light-emitting elements; or, when the number of the first preliminary light-emitting elements is less than the number of the second preliminary light-emitting elements, all of the first preliminary light-emitting elements are determined as the target light-emitting elements; or, when the number of the first preliminary light-emitting elements is equal to the number of the second preliminary light-emitting elements, all of the first preliminary light-emitting elements or all of the second preliminary light-emitting elements are determined as the target light-emitting elements.

8. The display device according to claim 7, characterized in that: The first direction is perpendicular to the second direction; Each of the optical waveguide elements in the first optical waveguide array comprises a first light emitting surface and a first transflective element array, and the first transflective element array comprises a plurality of first transflective elements; the light emitting element on the light incident side of each optical waveguide element in the first optical waveguide array is configured so that the light emitted by it undergoes multiple total reflections at least at the first light emitting surface of the corresponding optical waveguide element after entering the corresponding optical waveguide element and sequentially propagates to the plurality of first transflective elements in the first transflective element array, a portion of the light propagating to each first transflective element in the first transflective element array is reflected by the first transflective element out of the first light emitting surface and then enters the second optical waveguide array, and is transmitted through the optical waveguide elements in the second optical waveguide array and then enters the display panel, and another portion of the light propagating to each first transflective element in the first transflective element array passes through the first transflective element and continues to propagate in the corresponding optical waveguide element; Each of the optical waveguide elements in the second optical waveguide array includes a second light emitting surface and a second transflective element array, and the second transflective element array includes a plurality of second transflective elements; the light emitting element on the light incident side of each optical waveguide element in the second optical waveguide array is configured so that the light emitted by it undergoes multiple total reflections at least at the second light emitting surface of the corresponding optical waveguide element after entering the corresponding optical waveguide element and is sequentially propagated to the plurality of second transflective elements of the second transflective element array, a portion of the light propagated to each second transflective element of the second transflective element array is reflected by the second transflective element out of the second light emitting surface of the corresponding optical waveguide element and then is incident on the display panel, and another portion of the light propagated to each transflective element of the transflective element array passes through the transflective element and continues to propagate in the optical waveguide element.

9. A head-up display, characterized in that: It comprises the display device according to any one of claims 1 to 8 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.

10. A traffic device, characterized in that: Includes the head-up display as claimed in claim 9.

11. A method for controlling a display device, characterized in that: The display device comprises a display panel, a backlight source and a control module, wherein the display panel is located at the light emitting side of the backlight source, and the backlight source comprises an optical waveguide array and a plurality of light emitting elements, wherein the optical waveguide array comprises a plurality of optical waveguide elements, and the optical waveguide element corresponds to at least one of the light emitting elements, and the light emitted by the light emitting element is coupled into the corresponding optical waveguide element and coupled out through the corresponding optical waveguide element to form an irradiation area of ​​the light emitting element, and the method comprises: Determining a target display area of ​​the display panel according to the picture content in the picture to be displayed; Determining a target light emitting element corresponding to the target display area according to a relative positional relationship between the display panel and the illumination areas of the plurality of light emitting elements; Based on the target light emitting element, the light emitting state of at least part of the plurality of light emitting elements is adjusted.

12. The method according to claim 11, characterized in that The target display area is an area on the display panel corresponding to the picture content in the picture to be displayed; The adjusting the light emitting state of at least part of the plurality of light emitting elements based on the target light emitting element specifically includes: Turning on the target light-emitting element, or adjusting the light brightness of the target light-emitting element; The adjusting the light emitting state of at least part of the plurality of light emitting elements based on the target light emitting element specifically includes: Turn off non-target light-emitting elements other than the target light-emitting element among the plurality of light-emitting elements, or adjust the light-emitting brightness of the non-target light-emitting elements.

13. The method according to claim 11 or 12, characterized in that: All the optical waveguide elements in the optical waveguide array are arranged in sequence along a first direction on the light incident side of the display panel and extend along a second direction intersecting the first direction; The step of determining the target light emitting element corresponding to the target display area according to the relative position relationship between the display panel and the illumination areas of the plurality of light emitting elements specifically includes: All light-emitting elements whose illumination areas overlap with the target display area among the plurality of light-emitting elements are determined, and all the determined light-emitting elements are determined as the target light-emitting elements.

14. The method according to claim 11 or 12, characterized in that: The optical waveguide array comprises a first optical waveguide array and a second optical waveguide array, wherein a plurality of the optical waveguide elements in the first optical waveguide array are sequentially arranged along a first direction on the light incident side of the display panel and extend along a second direction intersecting the first direction, and a plurality of the optical waveguide elements in the second optical waveguide array are sequentially arranged along the second direction on the light incident side of the display panel and extend along the first direction, the first optical waveguide array and the second optical waveguide array are stacked, and the second optical waveguide array is located between the first optical waveguide array and the display panel; The step of determining the target light emitting element corresponding to the target display area according to the relative position relationship between the display panel and the illumination areas of the plurality of light emitting elements specifically includes: Determine all light emitting elements whose illumination areas overlap with the target display area among the light emitting elements corresponding to the plurality of light waveguide elements in the first light waveguide array, and determine all the determined light emitting elements as first preliminary light emitting elements; Determine all light emitting elements whose illumination areas overlap with the target display area among the light emitting elements corresponding to the plurality of light waveguide elements in the second light waveguide array, and determine all the determined light emitting elements as second preliminary light emitting elements; When the number of the first preliminary light-emitting elements is greater than the number of the second preliminary light-emitting elements, all of the second preliminary light-emitting elements are determined as the target light-emitting elements; or, when the number of the first preliminary light-emitting elements is less than the number of the second preliminary light-emitting elements, all of the first preliminary light-emitting elements are determined as the target light-emitting elements; or, when the number of the first preliminary light-emitting elements is equal to the number of the second preliminary light-emitting elements, all of the first preliminary light-emitting elements or all of the second preliminary light-emitting elements are determined as the target light-emitting elements.

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