Backlight module and display device

Abstract

The invention discloses a backlight module and a display device. The backlight module comprises a back plate; the backlight sources are arranged on the back plate at intervals, and each backlight source comprises a light-emitting element arranged on the back plate and an optical lens located on the light-emitting side of the light-emitting element; the optical lens comprises a light-in surface and a light-out surface, the cavity wall of the accommodating cavity forms the light-in surface, the peripheral side wall of the optical lens forms the light-out surface, and light emitted by the light-emitting element enters the optical lens through the light-in surface and is emitted out through the light-out surface; wherein a prism structure is annularly arranged at one end, far away from the back plate, of the light emitting surface, and the plane where the prism structure is located is obliquely arranged relative to the plane where the back plate is located. According to the invention, the light emitted by the prism structures on the optical lenses in the adjacent backlight sources can be prevented from interfering to generate interference fringes, and the display effect is improved.

Description

Technical Field

[0001] The present disclosure belongs to the field of display technology, and particularly relates to a backlight module and a display device. Background Art

[0002] With the development of technology and the advancement of science and technology, display devices can be seen everywhere in life, such as monitors and televisions. The backlight module is a light source supply device located behind the display device. Through the backlight module, the display panel in the display device can realize the display function. Therefore, the luminous effect of the backlight module directly affects the display effect of the display device.

[0003] When the backlight source in the backlight module uses a combination of light-emitting elements and optical lenses to emit light, the light emitted by the light-emitting elements is evenly diffused through the optical lens to increase the illumination range of the light-emitting elements. However, when the distance from the backlight source to the edge of the back panel and the mixed light distance of the backlight source are large, the light diffused by the light-emitting element through the optical lens cannot reach the edge of the back panel, resulting in brighter areas closer to the backlight source and darker areas farther from the backlight source, and the picture is uneven in brightness, resulting in poor display effects.

[0004] To this end, a prism structure is currently provided on the optical lens, and the light gain capability of the prism structure is utilized to allow more light to be transmitted to areas farther away from the backlight source, thereby increasing the brightness of the area and balancing the brightness of the picture. However, this will make it easy for the light emitted from the optical lens of the backlight source through the prism structure to interfere with the light emitted from the prism structure in the adjacent backlight source, generating interference fringes and forming bright spots, thus affecting the display effect. Summary of the invention

[0005] The purpose of the present disclosure is to provide a backlight module and a display device, which can prevent the light emitted from the prism structure on the optical lens in adjacent backlight sources from interfering and generating interference fringes, thereby improving the display effect.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions.

[0007] The first aspect of the present disclosure provides a backlight module, comprising: a backplane; a plurality of backlight sources, which are arranged on the backplane at intervals, the backlight source comprising a light-emitting element arranged on the backplane and an optical lens located on the light-emitting side of the light-emitting element, the optical lens having a accommodating cavity on a side facing the light-emitting element, the light-emitting element being located in the accommodating cavity; the optical lens comprising a light incident surface and a light emitting surface, the cavity wall of the accommodating cavity constituting the light incident surface, the outer peripheral side wall of the optical lens constituting the light emitting surface, the light emitted by the light-emitting element enters the optical lens through the light incident surface, and is emitted through the light emitting surface; wherein a prism structure is arranged around the end of the light emitting surface away from the backplane, so that light within a preset emission angle range can be emitted from the prism structure, thereby increasing the light intensity of light diffused away from the backplane, and the plane where the prism structure is located is inclined relative to the plane where the backplane is located.

[0008] In an exemplary embodiment of the present disclosure, the prism structures in any two adjacent backlight sources are tilted along the same direction.

[0009] In an exemplary embodiment of the present disclosure, the prism structure includes a plurality of triangular prisms arranged around the light-emitting surface, the plurality of triangular prisms are sequentially connected in a direction away from the back plate, and the inner side surfaces of the triangular prisms are connected to the light-emitting surface.

[0010] In an exemplary embodiment of the present disclosure, the edge of the triangular prism is inclined relative to the plane where the back plate is located, and the plane where the edge of the triangular prism is located intersects with the plane where the back plate is located, and the angle formed by them is greater than 0° and less than or equal to 5°.

[0011] In an exemplary embodiment of the present disclosure, the plurality of triangular prisms include a first triangular prism and a second triangular prism, and a tip of the first triangular prism is protruded relative to a tip of the second triangular prism in a direction from the backlight source to an edge of the back panel.

[0012] In an exemplary embodiment of the present disclosure, the tip of the first triangular prism has an arc transition.

[0013] In an exemplary embodiment of the present disclosure, at least two first triangular prisms are arranged at intervals, and the same number of second triangular prisms are arranged between any two adjacent first triangular prisms.

[0014] In an exemplary embodiment of the present disclosure, the light emitting surface is located at one end of the prism structure away from the back plate and is further provided with a platform portion, and the platform portion exceeds the prism structure in a direction away from the light emitting surface.

[0015] In an exemplary embodiment of the present disclosure, the backlight module further includes a reflective sheet disposed on the back plate, and part of the light is reflected by the reflective sheet and propagates in a direction away from the back plate.

[0016] The second aspect of the present disclosure discloses a display device, comprising the backlight module and a display panel, wherein the display panel is arranged on the light emitting side of the backlight module.

[0017] This application scheme has the following beneficial effects:

[0018] In the present application, a prism structure is provided at one end of the light emitting surface away from the back panel, so that light within a preset emission angle range is emitted from the prism structure and emitted to an area farther away from the backlight source, thereby increasing the light intensity of the light diffused away from the back panel and improving the brightness of the area. At the same time, the plane where the prism structure is located is inclined relative to the plane where the back panel is located, so as to prevent the light emitted from the prism structure on the optical lens in adjacent backlight sources from superimposing between the two backlight sources to generate interference fringes and form bright spots, thereby improving the display effect.

[0019] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by the practice of the present application.

[0020] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0022] Figure 1 FIG. 4 is a schematic diagram of the structure of the backlight module according to the first embodiment.

[0023] Figure 2 FIG. 4 is a schematic diagram of a partial structure of the backlight module according to the first embodiment from another direction.

[0024] Figure 3 1 is a light path diagram of an optical lens in a backlight module according to the first embodiment.

[0025] Figure 4 FIG. 4 is a schematic diagram of the structure of a backlight source in a backlight module according to the first embodiment of the present invention.

[0026] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0027] Figure 6 FIG. 4 is a cross-sectional view of a backlight source in a backlight module according to the first embodiment.

[0028] Figure 7 1 is a light path diagram of the prism structure in the backlight module according to the first embodiment.

[0029] Description of reference numerals:

[0030] Back panel 1, backlight source 2, light emitting element 21, optical lens 22, light incident surface 221, light emitting surface 222, platform portion 223, reflecting surface 224, prism structure 23, first triangular prism 231, second triangular prism 232, circuit board 24, support column 3, diffuser plate 4, optical film 5, display panel 6. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be more comprehensive and complete and will fully convey the concept of the example embodiments to those skilled in the art.

[0032] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner. In the following description, many specific details are provided to provide a full understanding of the embodiments of the present application. However, those skilled in the art will appreciate that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps, etc. can be adopted. In other cases, known methods, devices, realizations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0033] The present application is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be understood as limiting the present application.

[0034] Embodiment 1

[0035] When the backlight source in the backlight module adopts a combination of light-emitting elements and optical lenses to emit light, the light emitted by the light-emitting elements is evenly diffused by the optical lens to increase the illumination range of the light-emitting elements. However, when the distance from the backlight source to the edge of the back panel and / or the mixed light distance of the backlight source is large, such as when the distance from the backlight source to the edge of the back panel is greater than 290 mm and the mixed light distance of the backlight source is above 30 mm, the light diffused by the light-emitting element through the optical lens cannot reach the edge of the back panel, resulting in brighter areas closer to the backlight source and darker areas farther from the backlight source, and the picture is uneven in brightness, resulting in poor display effect.

[0036] At present, by setting a prism structure on the optical lens, the light gain capability of the prism structure is used to make more light propagate to the area farther from the backlight source, thereby improving the brightness of the area and balancing the brightness of the picture. However, this will make the light emitted from the optical lens of the backlight source through the prism structure easily interfere with the light emitted from the prism structure in the adjacent backlight source, generating interference fringes and forming bright spots, affecting the display effect. In order to solve the above problems, the present application proposes a backlight module.

[0037] Figure 1 FIG. 4 is a schematic diagram of the structure of the backlight module according to the first embodiment. Figure 2 FIG. 4 is a schematic diagram of a partial structure of the backlight module according to the first embodiment from another direction.

[0038] See also Figure 1 and Figure 2 A backlight module includes a back plate 1, a backlight source 2, a reflector, a diffuser 4 and an optical film 5. The back plate 1 is located at the bottom of the backlight module and has the function of supporting and bearing. The back plate 1 is usually a rectangular structure when viewed from the front. When applied to a special-shaped display device, its shape is adapted to the shape of the display device.

[0039] The back plate 1 is made of metal materials such as aluminum, iron, aluminum alloy or iron alloy, and has high strength. In this embodiment, the backlight module is a direct-type backlight module, and the backlight source 2 is arranged on the back plate 1 for emitting light.

[0040] In some embodiments, the diffuser 4 is disposed on the light-emitting side of the backlight source 2 and covers the front of the back plate 1. There is a certain distance between the diffuser 4 and the back plate 1 to improve the utilization rate of the light by the diffuser 4. The diffuser 4 has high diffusivity and can diffuse the light emitted by the backlight source 2 to various areas of the display panel 6, thereby providing uniform light for the display panel 6. Among them, a support column 3 is also provided on the back plate 1, and the top end of the support column 3 is supported on the bottom end of the diffuser 4 to support the diffuser 4 and prevent the diffuser 4 from collapsing in the middle.

[0041] In some embodiments, the optical film 5 is arranged on the side of the diffuser 4 facing away from the backlight source 2. The optical film 5 appears to include a prism film and a polarizing film, etc. By setting the optical film 5, the angular distribution of light can be improved, the total light flux can be increased, and sufficient brightness can be provided for the display panel 6.

[0042] In some embodiments, the backlight source 2 includes a light-emitting element 21 disposed on the back panel 1 and an optical lens 22 located on the light-emitting side of the light-emitting element 21. The optical lens 22 has a accommodating cavity on the side facing the light-emitting element 21. The light-emitting element 21 is disposed in the accommodating cavity. The optical lens 22 covers the light-emitting element 21 on the back panel 1. The light-emitting element 21 can be a light-emitting diode. After passing through the optical lens 22, the light emitted by the light-emitting element 21 can diffuse farther, thereby increasing the illumination range of the light-emitting element 21.

[0043] Figure 3 1 is a light path diagram of an optical lens in a backlight module according to the first embodiment.

[0044] See also Figure 3 In some embodiments, the light lens includes a light incident surface 221 and a light emitting surface 222. The cavity wall of the accommodating cavity constitutes the light incident surface 221. The light incident surface 221 is an outward convex curved surface disposed facing the light emitting element 21. The light emitted by the light emitting element 21 firstly irradiates the light incident surface 221, enters the optical lens 22 through the light incident surface 221, and then is emitted from the light emitting surface 222. The outer peripheral sidewall of the optical lens 22 constitutes the light emitting surface 222. It is understandable that the accommodating cavity is disposed at the center of the optical lens 22 to evenly spread the light to all sides.

[0045] In some embodiments, the optical lens 22 further includes a reflective surface 224, which is an inwardly concave curved surface disposed away from the light emitting element 21, and the light emitting surface 222 is connected between the reflective surface 224 and the bottom surface of the optical lens 22, and the bottom surface of the optical lens 22 is connected to the light emitting surface 222 and the light incident surface 221, and is connected to the back plate 1. The light emitted by the light emitting element 21 enters the optical lens 22 from the light incident surface 221, a portion of which is directly emitted to the light emitting surface 222 and emitted from the light emitting surface 222, and a portion of which is emitted to the reflective surface 224 and reflected by the reflective surface 224 to the light emitting surface 222, and then emitted from the light emitting surface 222.

[0046] Therefore, for the optical lens 22, when the light emitted by the light-emitting element 21 is emitted through the light incident surface 221 toward the end of the light emitting surface 222 close to the back panel 1, most of it is directly emitted through the light emitting surface 222 toward the side around the backlight source 2, illuminating the space around the backlight source 2. When the light emitted by the light-emitting element 21 is directly emitted through the light incident surface 221 or reflected through the reflecting surface 224 to the end of the light emitting surface 222 away from the back panel 1, most of it is emitted through the light emitting surface 222 toward the far end of the backlight source 2, illuminating the area farther away from the backlight source 2. However, when the distance from the backlight source 2 to the edge of the back panel 1 and the mixed light distance of the backlight source 2 are large, the light cannot reach the edge, or the light reaching the edge is weaker than the light around the backlight source 2, resulting in uneven brightness.

[0047] Figure 4 FIG. 4 is a schematic diagram of the structure of a backlight source in a backlight module according to the first embodiment of the present invention. Figure 5 for Figure 4 A partial enlarged view of point A in the middle. Figure 6 FIG. 4 is a cross-sectional view of a backlight source in a backlight module according to the first embodiment. Figure 7 1 is a light path diagram of the prism structure in the backlight module according to the first embodiment.

[0048] Continue to see Figures 4 to 7 In the present embodiment, a prism structure 23 is provided around one end of the light emitting surface 222 away from the back panel 1, so that light within a preset emission angle range can be emitted from the prism structure 23 toward an area farther from the backlight source 2, thereby increasing the intensity of light diffused in a direction away from the back panel 1 and improving the brightness of the area, thereby balancing the brightness of the area around the backlight source 2, achieving uniformity of light and dark, and improving the uniformity of the brightness of the picture.

[0049] Among them, when light passes through the prism structure 23, only light within the preset output angle range can be refracted by the prism structure 23 and then emitted. The remaining light does not meet the refraction conditions and is reflected back by the edge of the prism structure 23 and re-emitted by the optical lens 22. In this way, the light in the backlight source 2 is continuously recycled under the action of the prism structure 23. The light originally diverged in all directions is controlled to be within the preset angle range after passing through the prism structure 23, thereby achieving the effect of enhancing the brightness in a specific direction and improving the light utilization rate.

[0050] In this embodiment, the prism structure 23 is arranged on the end of the light-emitting surface 222 of the optical lens 22 away from the back panel 1, so that when the light emitted by the light-emitting element 21 passes through the prism structure 23, only the light within the preset emission angle range can continue to be emitted from the prism structure 23, thereby narrowing the emission range of the light, wherein the preset emission angle range is related to the properties of the prism structure 23 itself.

[0051] Specifically, the prism structure 23 includes a plurality of triangular prisms arranged around the light emitting surface 222, the plurality of triangular prisms are connected in sequence in a direction away from the back panel 1, the inner side surfaces of the triangular prisms are connected to the light emitting surface 222, the tips of the triangular prisms are facing the outside of the light emitting surface 222, and the plurality of triangular prisms are covered on the light emitting surface 222 in a wave shape, the cross-section of the triangular prisms can be an isosceles right triangle, the plane where the base of the isosceles right triangle is located is the inner side surface of the triangular prism, and the plane where the waist of the isosceles right triangle is located is the outer side surface of the triangular prism.

[0052] See also Figure 7 After the light enters the triangular prism from the inner side of the triangular prism, the light within the preset emission angle range is refracted and emitted through the outer side of the triangular prism, and this part of the light is set as the first light S1; the remaining part of the light is totally reflected by the outer side of the triangular prism and then emitted back to the optical lens 22 for re-emission, and this part of the light is set as the second light S2, until its emission angle is within the preset emission angle range; and some of the light is emitted through the outer side of the triangular prism and then emitted toward the outer side of the adjacent triangular prism due to the angle relationship and enters it, and this part of the light is set as the third light S3. Among them, the angle range between the first light rays S1 on the outermost sides after emitting from the outer side surface of the triangular prism is the preset emission angle range α, and the angles between the first light rays S1 on the outermost sides and the outer side surface of the triangular prism are α1 and α2 respectively, α=α1-α2, α1 and α2 are related to the structural properties of the triangular prism, and in this embodiment can be 140° and 70° respectively, then the preset emission angle range is α=70°, then all the emission light rays within the 70° fan angle can be emitted, this part of the first light rays S1 corresponds to the far end area of ​​the backlight source 2, and the second light rays S2 and the third light rays S3 that are not within this angle range are re-reflected into the prism structure 23 and the optical lens 22 until their emission angles are within the preset emission angle range, thereby amplifying the light emitted within this range.

[0053] In some embodiments, a reflective sheet is disposed on the back panel 1, and part of the light is reflected by the reflective sheet and propagates in a direction away from the back panel 1, which is beneficial to improving light utilization. In particular, after the first light refracted from the outer side surface of the triangular prism propagates to the reflective sheet, it can continue to propagate in a direction away from the backlight source 2 and the back panel 1 through the reflection effect of the reflective sheet, thereby increasing the light intensity of the light diffused in the direction away from the back panel 1 and improving the brightness of the area.

[0054] In some embodiments, a plurality of backlight sources 2 are provided, and the plurality of backlight sources are arranged at intervals on the back plate. The plurality of backlight sources 2 can make the brightness provided by the backlight module higher and the display effect better. It is understandable that the plurality of backlight sources can be arranged at equal intervals along the first direction, and the first direction can be parallel to the length direction or the width direction of the back plate 1, or can intersect therewith.

[0055] The bottom of the backlight sources 2 arranged at intervals along the first direction are connected to the circuit board 24, so that the light emitting elements 21 are electrically connected to the circuit board 24 to supply power to the light emitting elements 21 and control their light emission. The circuit board 24 can be a long strip extending along the first direction, so that the backlight sources 2 and the circuit board 24 arranged along the first direction form a light bar.

[0056] In some embodiments, a plurality of light bars may be arranged at intervals, and the plurality of light bars may be arranged at intervals along a second direction, and the second direction is perpendicular to the first direction, so that the backlight module emits light uniformly.

[0057] In some embodiments, the plane where the prism structure 23 is located is tilted relative to the plane where the back panel 1 is located, and the light emitted from the prism structure 23 on the optical lens 22 in adjacent backlight sources 2 avoids overlapping between the two backlight sources 2, thereby avoiding the generation of interference fringes at the overlapping point to form a bright spot. The prism structure 23 in any two adjacent backlight sources 2 is asymmetrically arranged. In this way, the interference fringes generated when the prism structure 23 on the optical lens 22 in the two adjacent backlight sources 2 emits light in each other's directions can be reduced, thereby reducing the generation of bright spots between adjacent backlight sources 2 in the case of multiple light strips.

[0058] Furthermore, the prism structures 23 in any two adjacent backlight sources 2 are tilted in the same direction so that the plane where the prism structures 23 are located has an angle with the plane where the back plate 1 is located, so that the adjacent prism structures 23 are arranged asymmetrically and no interference fringes are generated.

[0059] The prism structure 23 may be tilted toward the back plate 1 or away from the back plate 1, and the angle between the plane where the prism structure 23 is located and the plane where the back plate 1 is located is greater than 0° and less than or equal to 5°. Specifically, the edge of the triangular prism is tilted relative to the plane where the back plate is located, and the plane where the edge of the triangular prism is located intersects with the plane where the back plate is located, and the angle formed is greater than 0° and less than or equal to 5°, such as 1.5°, 3° or 5°.

[0060] See also Figure 5 In this embodiment, the prism structure 23 is inclined in a direction away from the back plate 1, and the plane where the back plate 1 is located is a horizontal plane. Taking one of the edges of the triangular prism as an example, assuming that the angle between it and the horizontal plane is a, then a=4°.

[0061] In some embodiments, the multiple triangular prisms include a first triangular prism 231 and a second triangular prism 232, and the tip of the first triangular prism 231 is protruded relative to the tip of the second triangular prism 232 in the direction from the backlight source 2 to the edge of the back panel 1. In this way, when contacting a foreign object, the foreign object first contacts the first triangular prism 231, which can provide a certain anti-collision protection for the second triangular prism 232 and prevent all triangular prisms from being damaged at the same time.

[0062] Furthermore, at least two first triangular prisms 231 are arranged at intervals, so that at least two points of support can be formed for external objects to protect the remaining second triangular prisms 232. There are the same number of second triangular prisms 232 between any two adjacent first triangular prisms 231, and the first triangular prisms 231 and the second triangular prisms 232 are regularly distributed, which has a better protection effect on the second triangular prisms 232. Among them, there can be 1, 2, 3 or 4 second triangular prisms 232 between any two adjacent first triangular prisms 231. In this embodiment, there are 3 second triangular prisms 232 between the two first triangular prisms 231.

[0063] It is understandable that each side of the first triangular prism 231 can be obtained by proportionally enlarging each side of the second triangular prism 232, so that the tip of the first triangular prism 231 protrudes relative to the tip of the second triangular prism 232, and the refraction and reflection angles of the two for light are the same.

[0064] In some embodiments, the tip of the first triangular prism 231 has an arc transition to prevent scratches on the installer who installs the optical lens 22 .

[0065] In some embodiments, the light emitting surface 222 is located at the end of the prism structure 23 away from the back plate 1 and is further provided with a platform portion 223, and the platform portion 223 extends beyond the prism structure 23 in the direction away from the light emitting surface 222, that is, extends beyond the tip of the first triangular prism 231. In this way, by providing the platform portion 223, the end of the prism structure 23 away from the back plate 1 is not exposed, and is protected by the platform portion 223 to reduce the probability of collision. It is understandable that the prism structure 23 can be integrally formed on the light emitting surface 222 of the optical lens 22, that is, the prism structure 23 is etched inwardly at the end of the light emitting surface 222 away from the back plate 1, and the unetched portion on the upper side of the prism structure 23 is the platform portion 223.

[0066] Embodiment 2

[0067] See also Figure 1 This embodiment provides a display device, which includes a display panel 6 and a backlight module of the first embodiment. The display panel 6 is arranged on the light-emitting side of the backlight module. The shape and size of the display panel 6 are usually matched with the backlight module. Usually, the display panel 6 can be set to a rectangular shape or a circular shape.

[0068] The display panel 6 may be a liquid crystal display panel 6, which can modulate the transmittance of light but does not emit light itself. The display panel 6 has a plurality of pixel units arranged in an array, each of which can independently control the transmittance and color of light incident to the pixel unit from the backlight module, so that the light transmitted by all pixel units constitutes the displayed image.

[0069] In this embodiment, the backlight module adopts a direct-type backlight module to provide the display panel 6 with sufficient brightness and uniform distribution of light, so that the display panel 6 can display images normally. Since the display device of this embodiment includes the backlight module described in the first embodiment, it also has the corresponding beneficial effects of the backlight module, which will not be repeated here.

[0070] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0071] In this application, unless otherwise clearly specified and limited, the terms "assembly", "connection" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral 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. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0072] In the description of this specification, the description of the reference terms "some embodiments", "exemplarily", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Those of ordinary skill in the art can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope covered by the patent of this application.

Claims

1. A backlight module, characterized in that: include: Back panel; A plurality of backlight sources, wherein the plurality of backlight sources are arranged at intervals on the back panel, wherein the backlight source comprises a light emitting element arranged on the back panel and an optical lens located at a light emitting side of the light emitting element, wherein the optical lens has a receiving cavity on a side facing the light emitting element, and the light emitting element is located in the receiving cavity; the optical lens comprises a light incident surface and a light emitting surface, wherein the cavity wall of the receiving cavity constitutes the light incident surface, and the outer peripheral side wall of the optical lens constitutes the light emitting surface, and the light emitted by the light emitting element enters the optical lens through the light incident surface and is emitted through the light emitting surface; Among them, a prism structure is arranged around one end of the light emitting surface away from the back plate, so that light within a preset emission angle range can be emitted from the prism structure to increase the intensity of light diffused away from the back plate, and the plane where the prism structure is located is inclined relative to the plane where the back plate is located.

2. The backlight module according to claim 1, characterized in that: The prism structures in any two adjacent backlight sources are arranged to be tilted in the same direction.

3. The backlight module according to claim 1, characterized in that: The prism structure includes a plurality of triangular prisms arranged around the light-emitting surface, the plurality of triangular prisms are connected in sequence in a direction away from the back plate, and the inner side surfaces of the triangular prisms are connected to the light-emitting surface.

4. The backlight module according to claim 3, characterized in that: The edge of the triangular prism is inclined relative to the plane where the back plate is located. The plane where the edge of the triangular prism is located intersects with the plane where the back plate is located, and the angle formed by them is greater than 0° and less than or equal to 5°.

5. The backlight module according to claim 3, characterized in that: The plurality of triangular prisms include a first triangular prism and a second triangular prism, wherein a tip of the first triangular prism is protruded relative to a tip of the second triangular prism in a direction from the backlight source to the edge of the back panel.

6. The backlight module according to claim 5, characterized in that: The tip of the first triangular prism has an arc transition.

7. The backlight module according to claim 5, characterized in that: At least two of the first triangular prisms are arranged at intervals, and the same number of the second triangular prisms are arranged between any two adjacent first triangular prisms.

8. The backlight module according to claim 1, characterized in that: The light emitting surface is located at one end of the prism structure away from the back plate and is further provided with a platform portion, and the platform portion extends beyond the prism structure in a direction away from the light emitting surface.

9. The backlight module according to claim 1, characterized in that: The backlight module further includes a reflective sheet disposed on the back plate, and part of the light is reflected by the reflective sheet and propagates in a direction away from the back plate.

10. A display device, characterized in that: The invention comprises a backlight module and a display panel as claimed in any one of claims 1 to 9, wherein the display panel is arranged on the light emitting side of the backlight module.

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