Backlight module and display device

Abstract

The invention relates to a backlight module and a display device. The backlight module comprises a driving substrate; the reflector plate is arranged on one side of the driving substrate, and the reflector plate comprises a plurality of openings; the light-emitting elements and the reflector plate are arranged on the same side of the driving substrate, at least parts of the light-emitting elements are located in the corresponding openings, and the light-emitting elements are electrically connected with the driving substrate; wherein the reflection sheet comprises a reflection substrate and a plurality of reflection protrusions, and the reflection protrusions are located on the surface of the side, away from the driving substrate, of the reflection substrate; in the direction perpendicular to the plane where the reflective sheet is located, the distance from the top surface of the reflective protrusion to the driving substrate is smaller than the distance from the upper surface of the light-emitting element to the driving substrate. The brightness uniformity of the backlight module can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a backlight module and a display device. Background Art

[0002] Liquid Crystal Display (LCD) has the advantages of light weight, thin thickness, low power consumption, easy to drive, and no harmful rays. It has been widely used in modern information devices such as televisions, laptops, mobile phones, personal digital assistants, and has broad development prospects.

[0003] Since LCD does not emit light by itself, it needs to couple with an external light source to achieve display. The direct-type backlight module is a light source located behind the LCD. Its light-emitting effect will directly affect the visual effect of the liquid crystal display module and is an indispensable component of the LCD. However, since the light-emitting elements in the direct-type backlight module emit light in all directions, only the light that is vertically irradiated onto the liquid crystal display panel can be effectively utilized, while the light that is vertically irradiated onto the liquid crystal display panel in the area between two adjacent light-emitting elements is smaller, which reduces the brightness uniformity of the backlight module and further reduces the brightness uniformity of the display device.

[0004] Therefore, how to adjust the light emission direction of the direct-lit backlight module to obtain a backlight module with higher brightness uniformity is a technical problem that urgently needs to be solved. Summary of the invention

[0005] Based on this, it is necessary to provide a backlight module and a display device to address the problem of insufficient brightness uniformity of the backlight module.

[0006] According to a first aspect of the present application, a backlight module is provided, comprising:

[0007] Driver substrate;

[0008] A reflective sheet, disposed on one side of the driving substrate, the reflective sheet comprising a plurality of openings;

[0009] A plurality of light emitting elements are arranged on the same side of the driving substrate as the reflective sheet, the light emitting elements are at least partially located in the corresponding openings, and the light emitting elements are electrically connected to the driving substrate;

[0010] Wherein, the reflective sheet comprises a reflective substrate and a plurality of reflective protrusions, and the reflective protrusions are located on a surface of the reflective substrate on a side away from the driving substrate;

[0011] In a direction perpendicular to the plane where the reflective sheet is located, a distance from the top surface of the reflective protrusion to the drive substrate is smaller than a distance from the upper surface of the light emitting element to the drive substrate.

[0012] In some embodiments, at least some of the reflective protrusions are arranged in a plurality of rings around the corresponding light-emitting elements.

[0013] In some embodiments, on the plane where the reflective sheet is located, the areas of the multiple reflective protrusions surrounding the same light-emitting element are the same.

[0014] In some embodiments, the spacing between two adjacent rings around the same light-emitting element is the same; and / or,

[0015] The distances between two adjacent light emitting elements on the same ring are the same.

[0016] In some embodiments, on the plane where the reflective sheet is located, the area of ​​the reflective protrusions surrounding the same light-emitting element gradually increases from close to the light-emitting element to far away from the light-emitting element.

[0017] In some embodiments, on the plane where the reflector is located, the distance between two adjacent rings gradually decreases from close to the light-emitting element to away from the light-emitting element; and / or,

[0018] The distances between two adjacent light emitting elements on the same ring are the same.

[0019] In some embodiments, the reflective protrusions are randomly distributed on a surface of the reflective base that is away from the driving substrate.

[0020] In some embodiments, the plurality of light-emitting elements include a first light-emitting element, a second light-emitting element, and a third light-emitting element, and the second light-emitting element and the third light-emitting element are both disposed adjacent to the first light-emitting element;

[0021] The distance between the second light-emitting element and the first light-emitting element is greater than the distance between the third light-emitting element and the first light-emitting element;

[0022] The density of the reflective protrusions per unit area between the second light emitting element and the first light emitting element is greater than the density of the reflective protrusions per unit area between the third light emitting element and the first light emitting element.

[0023] In some embodiments, in a direction perpendicular to the plane where the reflective sheet is located, the height of the reflective protrusion is greater than or equal to 0.2 mm; and / or,

[0024] In a direction parallel to the plane where the reflective sheet is located, the length of the reflective protrusion is greater than or equal to 0.4 mm; and / or,

[0025] In a direction parallel to the plane where the reflective sheet is located, a distance between two adjacent reflective protrusions is greater than or equal to 1 mm.

[0026] According to a second aspect of the present application, a display device is provided, comprising the backlight module described in any one of the above, and a display panel, wherein the display panel is located on a side of the light-emitting element away from the driving substrate.

[0027] In an embodiment of the present application, the reflective sheet includes a reflective substrate and a plurality of reflective protrusions, and the reflective protrusions are located on the surface of the reflective substrate away from the driving substrate, that is, the reflective protrusions are located between two adjacent light-emitting elements. On the one hand, the area of ​​the reflective layer between two adjacent light-emitting elements is increased, and the reflective protrusions can enhance the reflection of light in the area between two adjacent light-emitting elements, so that the backlight brightness between two adjacent light-emitting elements is greater; on the other hand, the reflective surface of the reflective protrusions converts a large amount of horizontally propagating light into light that is vertically irradiated onto the display panel, thereby increasing the light utilization rate in the area between two adjacent light-emitting elements. Through these two aspects, the light intensity that is vertically irradiated onto the display panel in the area between two adjacent light-emitting elements is increased, the brightness uniformity of the backlight module is improved, and the brightness uniformity of the display device is further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments or exemplary embodiments of the present application, the drawings required for use in the description of the embodiments or exemplary embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A three-dimensional schematic diagram of a reflective sheet provided in some embodiments of the present application.

[0030] Figure 2 A schematic top view of a reflector provided in some embodiments of the present application.

[0031] Figure 3 A first cross-sectional schematic diagram of a reflector provided in some embodiments of the present application.

[0032] Figure 4 A second cross-sectional schematic diagram of a reflector provided in some embodiments of the present application.

[0033] Figure 5 A schematic cross-sectional view of a partial structure of a backlight module provided in some embodiments of the present application.

[0034] Figure 6A schematic diagram of an optical film layer structure of a backlight module provided in some embodiments of the present application.

[0035] Figure 7 A partial top view schematic diagram of a first partial structure of a backlight module provided in some embodiments of the present application.

[0036] Figure 8 A partial top view schematically shows a second partial structure of a backlight module provided in some embodiments of the present application.

[0037] Fig. 9 A partial top view schematically shows a third partial structure of a backlight module provided in some embodiments of the present application.

[0038] Fig.10 A partial top view schematically shows a fourth partial structure of a backlight module provided in some embodiments of the present application.

[0039] Fig.11 A partial top view schematically showing a fifth partial structure of a backlight module provided in some embodiments of the present application.

[0040] Fig.12 A partial top view schematically showing a sixth partial structure of a backlight module provided in some embodiments of the present application.

[0041] Fig.13 A partial top view schematically showing a seventh partial structure of a backlight module provided in some embodiments of the present application.

[0042] Fig.14 The figure is a schematic diagram of the brightness curve of two adjacent light-emitting elements of a backlight module in the prior art.

[0043] Fig.15 A schematic diagram of a brightness curve of two adjacent light-emitting elements of a backlight module provided in some embodiments of the present application. DETAILED DESCRIPTION

[0044] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0045] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0047] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0048] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0049] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0050] In the related art, since the light-emitting elements in the direct-type backlight module emit light in all directions, only the light that is irradiated vertically onto the liquid crystal display panel can be effectively utilized, while the light that is irradiated vertically onto the liquid crystal display panel in the area between two adjacent light-emitting elements is smaller, which reduces the brightness uniformity of the backlight module and further reduces the brightness uniformity of the display device.

[0051] Based on the above problems, the present application provides a backlight module and a display device.

[0052] Figure 1 A three-dimensional schematic diagram of a reflective sheet provided in some embodiments of the present application. Figure 2 A schematic top view of a reflector provided in some embodiments of the present application. Figure 3 A first cross-sectional schematic diagram of a reflector provided in some embodiments of the present application. Figure 4 A second cross-sectional schematic diagram of a reflector provided in some embodiments of the present application. Figure 5 A schematic cross-sectional view of a partial structure of a backlight module provided in some embodiments of the present application. Figure 6 A schematic diagram of an optical film layer structure of a backlight module provided in some embodiments of the present application.

[0053] Figure 7 A partial top view schematic diagram of a first partial structure of a backlight module provided in some embodiments of the present application. Figure 8 A partial top view schematically shows a second partial structure of a backlight module provided in some embodiments of the present application. Fig. 9 A partial top view schematically shows a third partial structure of a backlight module provided in some embodiments of the present application. Fig.10 A partial top view schematically shows a fourth partial structure of a backlight module provided in some embodiments of the present application. Fig.11 A partial top view schematically showing a fifth partial structure of a backlight module provided in some embodiments of the present application.

[0054] Fig.12 A partial top view schematically showing a sixth partial structure of a backlight module provided in some embodiments of the present application. Fig.13A partial top view schematically showing a seventh partial structure of a backlight module provided in some embodiments of the present application.

[0055] First, see Figures 1 to 13 The present application provides a backlight module 100, which includes a driving substrate 11, a reflective sheet 20 and a plurality of light-emitting elements 12. The reflective sheet 20 is disposed on one side of the driving substrate 11, and includes a plurality of openings 21; the plurality of light-emitting elements 12 and the reflective sheet 20 are disposed on the same side of the driving substrate 11, and the light-emitting elements 12 are at least partially located in the corresponding openings 21, and the light-emitting elements 12 are electrically connected to the driving substrate 11; wherein the reflective sheet 20 includes a reflective substrate 201 and a plurality of reflective protrusions 22, and the reflective protrusions 22 are located on a side surface of the reflective substrate 201 away from the driving substrate 11; in a direction perpendicular to the plane where the reflective sheet 20 is located, the distance from the top surface of the reflective protrusion 22 to the driving substrate 11 is smaller than the distance from the upper surface of the light-emitting element 12 to the driving substrate 11.

[0056] For example, please combine Figure 5 and Figure 6 The backlight module 100 may include a lamp board 10 and a reflector 20. The lamp board 10 includes a driving substrate 11 and a plurality of light-emitting elements 12. The plurality of light-emitting elements may be LEDs (light-emitting diodes), MiniLEDs (mini light-emitting diodes), etc., and the size of the light-emitting elements is not limited here. The driving substrate 11 may be a circuit board that drives the plurality of light-emitting elements 12 to emit light, which is not limited here.

[0057] For example, Figure 6 It is shown that the backlight module 100 includes a lamp board 10, a reflective sheet 20, a light guide layer 30 (light guide plate), a lower diffuser 40, a lower brightness enhancement sheet 50 (for example, a lower prism sheet), an upper brightness enhancement sheet 60 (for example, an upper prism sheet), and an upper diffuser 70, which are stacked in sequence. The structure of the optical film in the backlight module 100 is not limited thereto. For example, the backlight module 100 includes a lamp board 10, a reflective sheet 20, a light guide layer 30 (light guide plate), a lower diffuser, an upper diffuser, a lower brightness enhancement sheet (for example, a lower prism sheet), and an upper brightness enhancement sheet (for example, an upper prism sheet) which are stacked in sequence; for example, the backlight module 100 includes a lamp board 10, a reflective sheet 20, a lower brightness enhancement sheet (for example, a lower prism sheet), an upper brightness enhancement sheet (for example, an upper prism sheet), a lower diffuser, and an upper diffuser which are stacked in sequence.

[0058] For example, multiple light-emitting elements 12 and the reflective sheet 20 are arranged on the same side of the driving substrate 11, the light-emitting elements 12 are at least partially located in the corresponding openings 21, and the light-emitting elements 12 are electrically connected to the driving substrate 11; that is, the light-emitting elements 12 protrude through the openings 21 of the reflective sheet 20.

[0059] For example, in a direction perpendicular to the plane where the reflective sheet 20 is located, the distance from the top surface of the reflective protrusion 22 to the driving substrate 11 is smaller than the distance from the upper surface of the light-emitting element 12 to the driving substrate 11, that is, relative to the plane where the driving substrate 11 is located, the height of the reflective protrusion 22 is smaller than the height of the light-emitting element 12, so that the reflective protrusion 22 can reflect light to an upper film layer instead of blocking the propagation of light.

[0060] For example, the reflective sheet 20 includes a plurality of reflective protrusions 22, and the reflective protrusions 22 are located on a surface of the reflective sheet 20 that is away from the driving substrate 11; that is, the reflective protrusions 22 are located between two adjacent light-emitting elements 12, which can enhance the reflection of light in the area between the two adjacent light-emitting elements 12, and at the same time, convert a large amount of horizontally propagating light into light that is vertically irradiated onto the liquid crystal display panel.

[0061] For example, the orthographic projection of the reflective protrusion 22 on the plane parallel to the driving substrate 11 may be in the shape of a square, a rectangle, a triangle, a circle, a plum blossom, a five-pointed star, an ellipse, or the like.

[0062] In the embodiment of the present application, the reflective sheet 20 includes a plurality of reflective protrusions 22, and the reflective protrusions 22 are located on the surface of the reflective sheet 20 away from the driving substrate 11, that is, the reflective protrusions 22 are located between two adjacent light-emitting elements 12. On the one hand, the area of ​​the reflective layer between the two adjacent light-emitting elements 12 is increased, and the reflective protrusions 22 can enhance the reflection of light at the portion between the two adjacent light-emitting elements 12, so that the backlight brightness between the two adjacent light-emitting elements 12 is greater; on the other hand, Figure 3 As shown by the middle arrow, the reflective surface of the reflective protrusion 22 converts a large amount of horizontally propagating light into light that irradiates the display panel vertically, thereby increasing the light utilization rate of the portion between two adjacent light-emitting elements 12. Through these two aspects, the light intensity that irradiates the display panel vertically at the portion between two adjacent light-emitting elements is increased, the brightness uniformity of the backlight module is improved, and the brightness uniformity of the display device is further improved.

[0063] In some embodiments, Figures 7 to 11 As shown, at least some of the reflective protrusions 22 are arranged in a plurality of rings around the corresponding light emitting elements 12 .

[0064] For example, multiple reflective protrusions 22 are arranged in multiple rings around the corresponding light-emitting elements 12. The multiple reflective protrusions 22 can evenly reflect light around the light-emitting elements 12, thereby more evenly improving the light intensity vertically irradiated onto the display panel at the position between two adjacent light-emitting elements, more evenly improving the brightness uniformity of the backlight module, and further better improving the brightness uniformity of the display device.

[0065] In some embodiments, Figure 7 and Figure 8 As shown, on the plane where the reflective sheet 20 is located, the areas of the multiple reflective protrusions 22 surrounding the same light emitting element 12 are the same.

[0066] In some embodiments, Figure 7 and Figure 8 As shown, the distance between two adjacent rings around the same light emitting element 12 is the same; and / or the distance between two adjacent light emitting elements 12 on the same ring is the same.

[0067] For example, Figure 7 The ring is shown as a rectangle. Figure 8 The ring is shown as a circle. In other embodiments, the ring may also be other shapes, such as an ellipse.

[0068] It should be noted that Figures 7 to 11 The first dotted line 20X in the figure indicates a ring, but the first dotted line 20X or the ring does not necessarily exist in the backlight module 100. In order to illustrate the arrangement of the light-emitting elements 12, the first dotted line 20X is used to indicate it.

[0069] It should be noted that Figures 7 to 11 Only the partially reflective protrusions 22 around the light emitting element 12 are illustrated, and only the partially reflective protrusions 22 on the first dotted line 20X or the ring are illustrated.

[0070] For example, Figure 7 and Figure 8 As shown, the multiple reflective protrusions 22 surrounding the same light emitting element 12 have the same area and shape, and the spacing between adjacent reflective protrusions 22 in the same ring is the same. At the same time, the spacing between different rings is also the same.

[0071] For example, in some embodiments, the distance between two adjacent light-emitting elements 12 is small, and it can be set that: on the plane where the reflective sheet 20 is located, the areas of multiple reflective protrusions 22 surrounding the same light-emitting element 12 are the same; and / or the spacing between two adjacent rings surrounding the same light-emitting element 12 is the same; and / or the spacing between two adjacent light-emitting elements 12 on the same ring is the same. This makes the reflective protrusions 22 play a more uniform reflection enhancement role at various locations between two adjacent light-emitting elements 12, mainly playing a role in increasing the utilization rate of horizontal light, thereby playing a role in improving the uniformity and brightness of the backlight brightness.

[0072] In some embodiments, Fig. 9 and Fig.10 As shown, on the plane where the reflective sheet 20 is located, the area of ​​the reflective protrusions 22 surrounding the same light emitting element 12 gradually increases from close to the light emitting element 12 to far away from the light emitting element 12 .

[0073] In some embodiments, Fig. 9 and Fig.10 As shown, on the plane where the reflector 20 is located, the distance between two adjacent rings gradually decreases from close to the light-emitting element 12 to away from the light-emitting element 12; and / or, the distance between two adjacent light-emitting elements 12 on the same ring is the same.

[0074] For example, Fig. 9 The ring is shown as a rectangle. Fig.10 The ring is shown as a circle. In other embodiments, the ring may also be other shapes, such as an ellipse.

[0075] For example, Fig. 9 and Fig.10 As shown, in some embodiments, the area of ​​the reflective protrusion 22 surrounding the same light emitting element 12 increases as it is farther away from the light emitting element 12, the spacing between two adjacent rings is the same, and the spacing between two adjacent light emitting elements 12 on the same ring is the same.

[0076] For example, refer to Fig. 9 and Fig.10 In some other embodiments, the area of ​​the reflective protrusion 22 surrounding the same light-emitting element 12 is larger as it is farther away from the light-emitting element 12; and / or the distance between two adjacent rings is smaller as it is farther away from the light-emitting element 12; and / or the distance between two adjacent light-emitting elements 12 on the same ring is the same.

[0077] For example, in some embodiments, the distance between two adjacent light-emitting elements 12 is relatively large, and it can be set that: on the plane where the reflective sheet 20 is located, the area of ​​the reflective protrusion 22 surrounding the same light-emitting element 12 gradually increases from the direction close to the light-emitting element 12 to the direction away from the light-emitting element 12; and / or, on the plane where the reflective sheet 20 is located, the spacing between two adjacent rings gradually decreases from the direction close to the light-emitting element 12 to the direction away from the light-emitting element 12; and / or, the spacing between two adjacent light-emitting elements 12 on the same ring is the same. In this case, the closer to the center of the part between the two adjacent light-emitting elements 12, the greater the brightness attenuation and the lower the light utilization rate. By setting in this way, the reflective protrusion 22 near the center of the part between the two adjacent light-emitting elements 12 can play a stronger reflection role, and at the same time play a stronger effect of improving uniformity and improving light utilization rate.

[0078] In some embodiments, Fig.12 As shown, the reflective protrusions 22 are randomly distributed on a surface of the reflective sheet 20 that is away from the driving substrate 11 .

[0079] For example, in some embodiments, the arrangement of the light-emitting elements 12 is relatively special. For example, the light-emitting brightness of a single light-emitting element 12 is very large, and the distance between two adjacent light-emitting elements 12 is very far. In order to avoid regular annular defects (such as annular bright bands) caused by the regular arrangement of the reflective protrusions 22, the reflective protrusions 22 can be arranged to be randomly distributed on the surface of the side of the reflective base 201 away from the driving substrate 11, so as to enhance reflection, improve brightness uniformity and light utilization, and avoid the generation of regular annular defects.

[0080] In some embodiments, Fig.13 As shown, the multiple light-emitting elements 12 include a first light-emitting element 12a, a second light-emitting element 12b and a third light-emitting element 12c, and the second light-emitting element 12b and the third light-emitting element 12c are both arranged adjacent to the first light-emitting element 12a; the distance between the second light-emitting element 12b and the first light-emitting element 12a is greater than the distance between the third light-emitting element 12c and the first light-emitting element 12a; the density of the reflective protrusions 22 per unit area between the second light-emitting element 12b and the first light-emitting element 12a is greater than the density of the reflective protrusions 22 per unit area between the third light-emitting element 12c and the first light-emitting element 12a.

[0081] For example, the distance between the second light-emitting element 12b and the first light-emitting element 12a is greater than the distance between the third light-emitting element 12c and the first light-emitting element 12a, that is, the second light-emitting element 12b is far away from the first light-emitting element 12a, and the brightness uniformity between the second light-emitting element 12b and the first light-emitting element 12a is worse, and the light utilization rate is lower.

[0082] For example, the density of the reflective protrusions 22 per unit area between the second light-emitting element 12b and the first light-emitting element 12a is greater than the density of the reflective protrusions 22 per unit area between the third light-emitting element 12c and the first light-emitting element 12a, that is, more reflective protrusions 22 are arranged between the second light-emitting element 12b and the first light-emitting element 12a, which can further enhance the light utilization rate between two adjacent light-emitting elements 12 that are far apart and improve the brightness uniformity.

[0083] In some embodiments, Figure 4 As shown, in a direction perpendicular to the plane where the reflective sheet 20 is located, the height of the reflective protrusion 22 is greater than or equal to 0.2 mm; and / or,

[0084] In a direction parallel to the plane where the reflective sheet 20 is located, the length of the reflective protrusion 22 is greater than or equal to 0.4 mm; and / or,

[0085] In a direction parallel to the plane where the reflective sheet 20 is located, the distance between two adjacent reflective protrusions 22 is greater than or equal to 1 mm.

[0086] For example, the height h of the reflective protrusion is greater than or equal to 0.2 mm, the length d1 of the reflective protrusion is greater than or equal to 0.4 mm, and the spacing d2 between two adjacent reflective protrusions is greater than or equal to 1 mm. This not only facilitates manufacturing and reduces manufacturing costs, but also enables the size and spacing of the reflective protrusions 22 to match the size of the light-emitting element.

[0087] It should be noted that, in some embodiments, Figure 4 As shown, the reflective sheet 20 is an integrally formed structure, that is, the reflective base 201 and the reflective protrusion 22 of the reflective sheet 20 are an integrally formed structure.

[0088] It should be noted that, in some embodiments, Figure 3 As shown, the reflective sheet 20 includes a reflective substrate 201, a plurality of substrate protrusions 202, and a reflective coating 203. The substrate protrusions 202 are located on a side surface of the reflective substrate 201 away from the driving substrate 11, and the reflective substrate 201 and the substrate protrusions 202 are an integrally formed structure; the reflective coating 203 is disposed on a side surface of the reflective substrate 201 and the substrate protrusions 202 away from the driving substrate 11. Figure 3 For example, a reflective substrate 201 and a plurality of substrate protrusions 202 are first formed, and then a reflective coating 203 is formed on the surface of the reflective substrate 201 and the substrate protrusions 202 which are away from the driving substrate 11 .

[0089] See also Fig.14 and Fig.15 , Fig.14 The figure is a schematic diagram of the brightness curve of two adjacent light-emitting elements of a backlight module in the prior art. Fig.15 A schematic diagram of a brightness curve of two adjacent light-emitting elements of a backlight module provided in some embodiments of the present application.

[0090] See also Fig.14 and Fig.15 In the prior art, the reflector 20 in the present application is not provided, and severe brightness attenuation occurs between the adjacent first light-emitting element 12a and the second light-emitting element 12b, resulting in low brightness uniformity and light utilization of the backlight module. Fig.15 As shown in the second dotted circle 10X, a reflective sheet 20 is provided in the embodiment of the present application. The reflective sheet 20 increases the brightness of the portion between the adjacent first light-emitting element 12a and the second light-emitting element 12b, proving that the present application can well improve the brightness uniformity and light utilization rate.

[0091] For example, the inventor has verified that in the same backlight module structure, before the reflective sheet 20 of the present application is set (a reflective sheet without reflective protrusions is set), the central brightness of the backlight module is 7203cd / m^2 and the brightness uniformity is 85%; after the reflective sheet 20 of the present application is set, the central brightness of the backlight module is 7816cd / m^2 and the brightness uniformity is 87%. This shows that the embodiments of the application can greatly improve the brightness and brightness uniformity of the backlight module.

[0092] Secondly, please combine Figure 6 The present application also provides a display device, which includes the backlight module 100 of any one of the above items, and a display panel 80, and the display panel is located on a side of the light-emitting element 12 away from the driving substrate 11.

[0093] For example, the display device may include a backlight module 100 and a display panel disposed on a light emitting side of the backlight module 100 .

[0094] For example, the display device may be an electronic product, which includes a backlight module 100 and a display panel disposed on the light-emitting side of the backlight module 100 . For example, the display device may be any one of a television, a mobile phone, and a computer.

[0095] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0096] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A backlight module, characterized in that: include: Driver substrate; A reflective sheet, disposed on one side of the driving substrate, the reflective sheet comprising a plurality of openings; A plurality of light emitting elements are arranged on the same side of the driving substrate as the reflective sheet, the light emitting elements are at least partially located in the corresponding openings, and the light emitting elements are electrically connected to the driving substrate; Wherein, the reflective sheet comprises a reflective substrate and a plurality of reflective protrusions, and the reflective protrusions are located on a surface of the reflective substrate on a side away from the driving substrate; In a direction perpendicular to the plane where the reflective sheet is located, a distance from the top surface of the reflective protrusion to the drive substrate is smaller than a distance from the upper surface of the light emitting element to the drive substrate.

2. The backlight module according to claim 1, characterized in that: At least part of the reflective protrusions are arranged in a plurality of rings around the corresponding light emitting elements.

3. The backlight module according to claim 2, characterized in that: On the plane where the reflection sheet is located, the areas of the multiple reflection protrusions surrounding the same light emitting element are the same.

4. The backlight module according to claim 3, characterized in that: The distances between two adjacent rings surrounding the same light-emitting element are the same; and / or, The distances between two adjacent light emitting elements on the same ring are the same.

5. The backlight module according to claim 2, characterized in that: On the plane where the reflection sheet is located, the area of ​​the reflection protrusion surrounding the same light-emitting element gradually increases from close to the light-emitting element to far away from the light-emitting element.

6. The backlight module according to claim 5, characterized in that: On the plane where the reflector is located, the distance between two adjacent rings gradually decreases from close to the light-emitting element to far away from the light-emitting element; and / or, The distances between two adjacent light emitting elements on the same ring are the same.

7. The backlight module according to claim 1, characterized in that: The reflective protrusions are randomly distributed on a surface of the reflective base which is away from the driving substrate.

8. The backlight module according to claim 1, characterized in that: The plurality of light emitting elements include a first light emitting element, a second light emitting element and a third light emitting element, wherein the second light emitting element and the third light emitting element are both arranged adjacent to the first light emitting element; The distance between the second light-emitting element and the first light-emitting element is greater than the distance between the third light-emitting element and the first light-emitting element; The density of the reflective protrusions per unit area between the second light emitting element and the first light emitting element is greater than the density of the reflective protrusions per unit area between the third light emitting element and the first light emitting element.

9. The backlight module according to claim 1, characterized in that: In a direction perpendicular to the plane where the reflective sheet is located, the height of the reflective protrusion is greater than or equal to 0.2 mm; and / or, In a direction parallel to the plane where the reflective sheet is located, the length of the reflective protrusion is greater than or equal to 0.4 mm; and / or, In a direction parallel to the plane where the reflective sheet is located, a distance between two adjacent reflective protrusions is greater than or equal to 1 mm.

10. A display device, characterized in that: It comprises the backlight module as claimed in any one of claims 1 to 9, and a display panel, wherein the display panel is located on a side of the light emitting element away from the driving substrate.

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