Display module and display device

Abstract

The present invention provides a display module and a display device, which relate to the technical field of display equipment. The display module includes a display panel and a backlight module. The backlight module includes: a back plate, including a bottom plate arranged opposite to the display panel; a light source assembly arranged on the bottom plate; and a middle frame, located between the display panel and the bottom plate, for supporting the display panel; wherein the middle frame is made of a light-guiding material and can guide the light emitted by the light source assembly to the edge of the display area of ​​the display panel. Based on the technical solution of the present invention, the middle frame with a light-guiding effect is used to guide light to the peripheral area of ​​the display panel, which can effectively avoid the pixel occlusion problem in the peripheral area of ​​the display screen and the resulting peripheral dark area and brightness attenuation area, so that the peripheral area of ​​the display screen can display images normally and maintain the same brightness as the main display area, greatly improving the overall display effect of the display screen.

Description

Technical Field

[0001] The present invention relates to the technical field of display equipment, and in particular to a display module and a display device. Background Art

[0002] Current display screen structures typically require a midframe structure to support the display panel. This prevents the area where the midframe contacts the edge of the display panel from receiving light, resulting in localized dark areas. These dark areas appear as dark frames on the display panel edge, affecting the display quality. This defect is particularly detrimental to display quality in spliced ​​screen products.

[0003] Therefore, the present invention proposes a display module and a display device, which solve the problem of bright and dark frames on the edges of current display screens based on improvements in structural design. Summary of the Invention

[0004] In order to solve the problem in the prior art that display screens have dark areas at the edges and different brightness of the dark areas, which affects the display effect, the present invention proposes a display module and a display device.

[0005] In a first aspect, the present invention provides a display module comprising a display panel and a backlight module, wherein the backlight module comprises:

[0006] a backplane, comprising a bottom plate arranged opposite to the display panel;

[0007] A light source assembly is provided on the bottom plate; and

[0008] a middle frame, located between the display panel and the bottom plate, and used to support the display panel;

[0009] The middle frame is made of light-guiding material, and can guide the light emitted by the light source assembly to the edge of the display area of ​​the display panel.

[0010] In one embodiment, the material of the middle frame includes a substrate and scattering particles located in the substrate;

[0011] The material of the substrate includes at least one of PMMA, PC and PS, and the material of the scattering particles includes at least one of silicon dioxide particles, calcium carbonate particles and nano-barium sulfate particles.

[0012] In one embodiment, the mass / volume percentage of the scattering particles is in the range of 0.2-1.0%.

[0013] In one embodiment, the middle frame appears white under natural light.

[0014] In one embodiment, the light source assembly includes a first sub-light source assembly and a second sub-light source assembly;

[0015] The first sub-light source assembly includes a plurality of first light-emitting units, and the plurality of first light-emitting units as a whole constitute a surface light source that emits light toward the display panel; the second sub-light source assembly is located on a side of the middle frame away from the display panel;

[0016] At least a portion of the middle frame and at least a portion of the second sub-light source assembly extend together along a boundary of a display area of ​​the display panel.

[0017] In one embodiment, the middle frame includes a light shield portion, and in the thickness direction of the display panel, a parallel projection of the light shield portion on the bottom plate overlaps with a parallel projection of the second sub-light source assembly on the bottom plate.

[0018] In one embodiment, in the thickness direction of the display panel, the parallel projection of the second sub-light source assembly on the bottom plate is located inside the parallel projection of the middle frame on the bottom plate.

[0019] In one embodiment, the light shield portion includes an extension portion and a bending portion, the bending portion is closer to the first sub-light source assembly than the extension portion, the bending portion is connected to the extension portion, and the bending portion is bent toward the bottom plate relative to the extension portion.

[0020] In one embodiment, a light-concentrating structure is present on the surface of the light shield portion close to the second sub-light source assembly, and the light-concentrating structure includes a plurality of grooves arranged in sequence.

[0021] In one embodiment, the bottom plate includes a first step and a second step, the first step is closer to the display panel than the second step, and the second step extends along a boundary of a display area of ​​the display panel;

[0022] The first sub-light source assembly is located on the first step, and the second sub-light source assembly is located on the second step.

[0023] In one embodiment, the second sub-light source assembly includes a plurality of second light-emitting units distributed at intervals, and the interval distance between the second light-emitting units is smaller than the interval distance between the first light-emitting units on the first sub-light source assembly.

[0024] In one embodiment, the middle frame includes a light transmission portion, the light transmission portion includes a first end close to the display panel and a second end away from the display panel, the first end provides support for the display panel, and the second end is connected to the light shield portion.

[0025] In one embodiment, the back plate includes a back plate side edge bent and extended toward the display panel, and the middle frame is arranged across a side of the back plate side edge close to the display panel.

[0026] In one embodiment, the light source assembly includes a plurality of first light emitting units, and the plurality of first light emitting units as a whole constitute a surface light source that emits light toward the display panel;

[0027] The middle frame includes a light-conducting portion, which includes a first end close to the display panel and a second end away from the display panel; the back panel includes a back panel side that is bent and extended toward the display panel, and the middle frame is arranged across one side of the back panel side close to the display panel; the first end provides support for the display panel.

[0028] In one embodiment, the distance from the second end to the display panel is greater than the maximum distance between the first light emitting unit and the display panel.

[0029] In one embodiment, a reflective sheet is further provided between the light transmission portion and the side of the back plate, and the reflection direction of the reflective sheet is toward the light transmission portion.

[0030] In a second aspect, the present invention provides a display device comprising the above-mentioned display module, thereby having all the technical effects thereof.

[0031] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0032] Compared with the prior art, the display module and display device provided by the present invention have at least the following features:

[0033] Beneficial effects:

[0034] A display module and display device of the present invention utilize a middle frame with a light-guiding effect to guide light into the peripheral area of ​​the display panel, which can greatly improve the brightness of the edge of the display panel, thereby effectively avoiding the pixel occlusion problem in the peripheral area of ​​the display screen and the resulting peripheral dark areas and brightness attenuation areas, so that the peripheral area of ​​the display screen can display images normally and maintain the same brightness as the main display area, greatly improving the overall display effect of the display screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0036] Figure 1 A cross-sectional view showing one structure of the display module of the present invention;

[0037] Figure 2 Shows Figure 1 The display module shown is applied to a cross-sectional view of another model of display screen;

[0038] Figure 3 A cross-sectional view showing another structure of the display module of the present invention;

[0039] Figure 4 A schematic cross-sectional view of a middle frame in a display module of the present invention is shown;

[0040] Figure 5 A partial schematic diagram showing the back panel structure of the display module of the present invention is shown.

[0041] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily true to scale.

[0042] Reference numerals:

[0043] 1-back panel, 11-bottom panel, 111-first step, 112-second step, 12-back panel side, 2-light source assembly, 21-first sub-light source assembly, 211-first light-emitting unit, 22-second sub-light source assembly, 221-second light-emitting unit, 3-middle frame, 31-light shield, 311-extension portion, 312-bending portion, 32-light transmission portion, 33-light-concentrating structure, 4-reflector, 5-display panel. DETAILED DESCRIPTION

[0044] The current RNB (Razor Narrow Bezel, 0.88mm gap) and ENB (Extreme Narrow Bezel, 1.7mm gap) series of spliced ​​screens, as extremely narrow gap products, are more sensitive to dark areas on the screen. Taking RNB products as an example, the current RNB uses a center frame structure. The location where the center frame contacts the glass diffuser in the display panel causes a dark frame at the edge due to the lack of light. At the same time, due to the influence of the center frame angle, LED position, and light emission angle, the brightness at the edge of the screen is severely attenuated, resulting in a dark band problem around the edges.

[0045] There are currently technical solutions to improve the problem of dark areas on the screen, usually by locally adding LED light sources or using a large number of reflectors to adjust the angle of light. However, these methods can only improve the brightness of the original dark areas to a very limited extent. In fact, there is still a very obvious brightness difference, and the original dark areas cannot be further eliminated. Moreover, the existing means are not only ineffective, but also increase the number of components and are costly.

[0046] In view of the above problems existing in current display panels, the present invention will be further described below with reference to the accompanying drawings.

[0047] Example 1

[0048] This embodiment mainly takes the RNB splicing screen product as an example to illustrate the specific implementation of one of the optional structures of the display module of the present invention on the RNB splicing screen product.

[0049] An embodiment of the present invention provides a display module comprising a display panel 5 and a backlight module. The backlight module comprises a backplate 1, a light source assembly 2, and a middle frame 3. The backplate 1 comprises a bottom plate 11 disposed opposite the display panel 5; the light source assembly 2 is disposed on the bottom plate 11; and the middle frame 3 is located between the display panel 5 and the bottom plate 11 to support the display panel 5.

[0050] The middle frame 3 is made of light-guiding material, and can guide the light emitted by the light source assembly 2 to the edge of the display area of ​​the display panel 5 .

[0051] Specifically, referring to the accompanying drawings Figure 1 In the display module, one end of the middle frame 3 is fixed to the back plate 1, and the other end is supported on the edge of the display panel. From a structural point of view, no light will enter the part where the end of the middle frame 3 contacts the display panel 5 in a conventional solution, which will result in a dark area at the edge of the display area of ​​the display panel 5. In this embodiment, the middle frame 3 is made of a light-guiding material, so that the light from the light source assembly 2 can be transmitted through the inside of the middle frame 3. In other words, the middle frame 3 as a whole will glow under the illumination of the light from the light source assembly 2, so the middle frame 3 itself can be regarded as a light source. Therefore, since the middle frame 3 itself is luminous, it guides the light to the contact area between the end of the middle frame 3 and the edge of the display panel 5, so the brightness of the contact area is significantly improved, thereby eliminating the dark area formed on the display panel 5 corresponding to the contact area.

[0052] Moreover, in the prior art, since it is necessary to consider the light receiving problem at the edge of the display panel 5, when the middle frame 3 does not have light-guiding properties, some requirements and restrictions are imposed on the structure of the middle frame 3 itself. For example, Figure 1 The overall shape and structure of the middle frame 3, as shown, and the angle design of the curved surface portion on the inner side of the middle frame 3, need to be based on the optimal shape and angle to reflect as much light as possible to the edge areas of the display panel 5. However, the light actually reflected to the edge areas of the display panel 5 is very limited. Therefore, in conventional display screens, not only is a dark area formed in the contact area between the middle frame 3 and the display panel 5, but a brightness decay zone with continuously decreasing brightness also exists between the dark band and the main area of ​​the display panel 5. Therefore, the brightness decay zone and darkening occupy a large proportion of the overall area of ​​the display panel 5, seriously affecting the display quality of the display, especially the tiled display.

[0053] Therefore, based on the structural design of the display module of this embodiment, compared to existing display screens, the display module of this embodiment can significantly improve the brightness of the edges of the display panel 5. This effectively avoids the generation of dark areas and brightness decay areas around the display screen, as well as pixel occlusion in the peripheral areas, allowing the peripheral areas to display images normally and significantly improving the display quality. Furthermore, since light is no longer solely reflected by the middle frame 3 to guide light to the edge areas of the display panel 5, the design of the middle frame 3 itself in terms of structure and surface angles can be more diverse.

[0054] In addition, this embodiment takes the RNB splicing screen product as an example. Since the splicing seam requirement is 0.88mm, the contact support between the middle frame and the display panel adopts a tip structure that is processed into a cone shape at the end of the middle frame, which directly contacts the edge of the innermost surface of the display panel, as shown in the attached figure. Figure 1 shown.

[0055] Furthermore, the material of the middle frame 3 includes a substrate and scattering particles located in the substrate; wherein the material of the substrate includes at least one of PMMA, PC and PS, and the material of the scattering particles includes at least one of silica particles, calcium carbonate particles and nano-barium sulfate particles.

[0056] Specifically, the light-guiding effect of the middle frame 3 itself is determined by the manufacturing materials used. Therefore, special consideration should be given to the materials to enhance the light-guiding effect as much as possible. In this embodiment, the middle frame 3 is manufactured by injection molding a mixed material consisting of a base material and scattering particles. Among them, the base material needs to be light-transmitting. In this embodiment, at least one of PMMA (polymethyl methacrylate), PC (polycarbonate), and PS (polystyrene) is used. These materials all have high transparency and meet the basic conditions for light guidance. Of course, other transparent plastic materials can also be selected as needed. The scattering particles added therein are used to increase the scattering of light and improve the uniformity of light propagation within the middle frame 3. On the other hand, they are used to give the middle frame 3 a certain degree of haze as a whole based on the base material rather than being completely transparent. In this embodiment, the scattering particles are used as at least one of silica particles, calcium carbonate particles, and nano-barium sulfate particles. Other light diffusers can also be used as needed.

[0057] Specifically, while a completely transparent middle frame 3 theoretically provides excellent light-guiding properties, if it were completely transparent, the other components of the display module would be directly reflected within it. Therefore, the colors of these other components would directly affect the color of the light guided by the middle frame 3. For example, the other components of the backlight module (e.g., backplate 1, outer frame, etc.) are typically darker in color (e.g., black), resulting in a dimmed light path through the middle frame 3. Therefore, using scattering particles to increase the haze of the middle frame 3 can reduce the impact of these other components on the light path through the middle frame 3, and the scattering particles can also improve the uniformity of the light path.

[0058] Furthermore, in the material of the middle frame, the mass percentage of the scattering particles is in the range of 0.2-1.0%; preferably, the mass percentage of the scattering particles is in the range of 0.4-0.8%; more preferably, the mass percentage of the scattering particles is 0.6%.

[0059] Specifically, in this embodiment, the middle frame 3, which was injection-molded using PC as the base material and 0.6% by mass of silica particles as scattering particles, exhibited excellent light-guiding properties based on experimental testing. The middle frame 3 itself exhibited a certain degree of haze, significantly reducing the impact of other display module components reflected within the middle frame 3 on the light-guiding performance. Actual experimental results demonstrated that the light-guiding middle frame 3 virtually completely eliminated the dark areas at the edges of the display panel 5. Visually, the differences in brightness and color between the edge regions, where the dark areas originally existed, and the display area of ​​the display panel 5 were virtually unnoticeable to the naked eye, significantly improving the user's visual experience.

[0060] Of course, the specific proportion of scattering particles required to achieve the best light-guiding effect may vary depending on the combination of different substrates and scattering particles. Currently, in a combination using PC as the substrate and silica particles as scattering particles, the preferred proportion of silica particles is 0.6%.

[0061] Furthermore, the middle frame 3 appears white under natural light.

[0062] Specifically, in this embodiment, the middle frame 3 is injection-molded using a mixture of a base material and scattering particles. The resulting middle frame 3 is not completely transparent, exhibiting a certain degree of haze. When not conducting light, the middle frame 3 appears white under natural light, but exhibits normal light transmittance when conducting light. For example, in this embodiment, the middle frame 3, which is injection-molded using PC as the base material and 0.6% by mass of silica particles as the scattering particles, appears whitish under natural light.

[0063] Furthermore, the light source assembly 2 includes a first sub-light source assembly 21 and a second sub-light source assembly 22; the first sub-light source assembly 21 includes a plurality of first light-emitting units 211, and the plurality of first light-emitting units 211 as a whole constitute a surface light source that emits light toward the display panel 5; the second sub-light source assembly 22 is located on the side of the middle frame 3 away from the display panel 5.

[0064] At least a portion of the middle frame 3 and at least a portion of the second sub-light source assembly 22 extend along the boundary of the display area of ​​the display panel 5 .

[0065] Specifically, as shown in the accompanying drawings Figure 1 As shown, the light source assembly 2 in this embodiment includes two parts: a first sub-light source assembly 21 and a second sub-light source assembly 22. The multiple first light-emitting units 211 of the first sub-light source assembly 21 are arranged in the main area of ​​the bottom plate 11 of the back plate 1, forming a surface light source facing the display panel 5, mainly providing a backlight source for the display panel 5. In addition, the first light-emitting units 211 at the edge of the first sub-light source assembly 21 close to the middle frame 3 can also provide a light guide source for the middle frame 3. The second sub-light source assembly 22 is directly arranged in correspondence with the middle frame 3, and its function is to provide a light guide source for the middle frame 3. Therefore, the first sub-light source assembly 21 and the second sub-light source assembly 22 can jointly provide sufficient light sources for the light guide of the middle frame 3, thereby ensuring the effect of eliminating the dark area at the edge of the display panel 5.

[0066] In addition, as shown in the attached figure Figure 5 As shown, the middle frame 3 adopts a continuously extended structure, which will form a dark area that continuously extends along the edge. In order to completely eliminate the dark area at the edge of the display area of ​​the display panel 5, the middle frame 3 and at least part of the second sub-light source assembly 22 are designed to be an extended structure, as shown in the accompanying drawings. Figure 5 As shown, the brightness of the four edges of the display panel 5 can be significantly improved, eliminating the dark areas on the four edges.

[0067] Of course, if the middle frame 3 adopts discontinuous multi-point contact support with the display panel 5, then the dark area formed will also be a discontinuously distributed multi-point structure. At this time, the second sub-light source group can also be set to a multi-point distribution structure, corresponding to the support points between the middle frame 3 and the display panel 5 respectively.

[0068] Furthermore, the middle frame 3 includes a light shield portion 31 . In the thickness direction of the display panel 5 , a parallel projection of the light shield portion 31 on the bottom plate 11 overlaps with a parallel projection of the second sub-light source assembly 22 on the bottom plate 11 .

[0069] Specifically, as shown in the accompanying drawings Figure 1As shown, the middle frame 3 is specifically configured with a light shield portion 31. The light shield portion 31 at least partially covers the second sub-light source assembly 22, meaning that their projections on the base plate 11 at least partially overlap. The function of this light shield portion 31 is to increase the area in the direction of light from the second sub-light source assembly 22, thereby guiding more light into the light shield portion 31 and then into the middle frame 3 for light transmission. This helps improve the light guiding effect and brightness of the middle frame 3, thereby effectively eliminating dark areas.

[0070] Preferably, in the thickness direction of the display panel 5, the parallel projection of the second sub-light source assembly 22 on the bottom plate 11 is located inside the parallel projection of the middle frame 3 on the bottom plate 11. That is, the light shield portion 31 completely covers the space above the second sub-light source assembly 22, so that light from the second sub-light source assembly 22 can enter the middle frame 3 through the light shield portion 31 to the greatest extent possible.

[0071] Furthermore, the light shield portion 31 includes an extension portion 311 and a bending portion 312 . The bending portion 312 is closer to the first sub-light source assembly 21 than the extension portion 311 . The bending portion 312 is connected to the extension portion 311 and is bent relative to the extension portion 311 toward the bottom plate 11 .

[0072] Specifically, as shown in the accompanying drawings Figure 4 As shown, the light shield portion 31 includes an extension portion 311 and a bending portion 312. The extension portion 311 mainly corresponds to the second sub-light source assembly 22, while the bending portion 312 is located on one side of the second sub-light source assembly 22 and close to the first sub-light source assembly 21. Figure 1 The bent portion 312 here structurally covers the side of the second sub-light source assembly 22. Its main functions are: on the one hand, it is used to further receive and guide the light from the side of the second sub-light source assembly 22, thereby improving the light guiding effect of the middle frame 3; on the other hand, it prevents the light from the side of the second sub-light source assembly 22 from excessively propagating toward the position of the first sub-light source assembly 21, thereby affecting the light effect at the edge of the first sub-light source assembly 21 and causing the formation of a local bright band on the display panel 5.

[0073] Furthermore, a light-concentrating structure 33 is provided on the surface of the light shield portion 31 close to the second sub-light source assembly 22 . The light-concentrating structure 33 includes a plurality of grooves arranged in sequence.

[0074] Specifically, as shown in the accompanying drawings Figure 4As shown, the focusing structure 33 (i.e., lenti structure) utilizes multiple grooves constructed on the surface (lower surface) of the light shield portion 31 adjacent to the second sub-light source assembly 22. The purpose of this structure is to utilize the grooves to increase light refraction, thereby converging the light, unifying the light's angle and direction of emission, enhancing the focusing effect, and improving the brightness of the middle frame 3. Depending on specific needs, the grooves can be designed as strips, such as strips with a V-shaped cross-section, thus forming a wavy structure on the surface of the light shield portion 31; the grooves can also be designed as an array of dotted grooves.

[0075] Furthermore, the bottom plate 11 includes a first step 111 and a second step 112 . The first step 111 is closer to the display panel 5 than the second step 112 . The second step 112 extends along the boundary of the display area of ​​the display panel 5 .

[0076] The first sub-light source assembly 21 is located on the first step 111 , and the second sub-light source assembly 22 is located on the second step 112 .

[0077] Specifically, as shown in the accompanying drawings Figure 1 As shown, a first step 111 and a second step 112 with a height difference are formed on the bottom plate 11. The second step 112 is located at the edge of the bottom plate 11 and is farther away from the display panel 5 than the first step 111. The first sub-light source assembly 21 and the second sub-light source assembly 22 are respectively arranged on the first step 111 and the second step 112. In this way, the two light source assemblies 2 are staggered in a direction perpendicular to the surface of the display panel 5, facilitating their installation and preventing interference between their light sources.

[0078] For example, when LED lamp beads are used, the LED lamp beads of the first sub-light source assembly 21 and the second sub-light source assembly 22 are both arranged on a lamp board or light strip, and then further mounted on the base plate 11. Therefore, the installation area required for the lamp board or light strip may exceed the area of ​​the LED lamp distribution area. Therefore, if the lamp boards or light strips of the first sub-light source assembly 21 and the second sub-light source assembly 22 are in the same plane, interference may occur. Therefore, the height difference of the step structure is used to eliminate interference. Similarly, based on the staggered structure of the first sub-light source assembly 21 and the second sub-light source assembly 22, the areas corresponding to the light emitted by the two sub-light sources are also staggered by a certain distance from each other, which can improve the problem of interference between the two light sources.

[0079] In addition, the second step 112 actually forms a groove compared to the first step 111. Then, preferably, the second sub-light source assembly 22 is completely located in the groove in the depth direction of the groove, and the light shield portion 31 corresponding to the second sub-light source assembly 22 at least partially extends into the groove, and the surface (upper surface) of the light shield portion 31 away from the second light-emitting unit 221 is lower than the height of the reflective sheet of the first sub-light source assembly 21 compared to the height of the bottom of the groove.

[0080] Specifically, as shown in the attached figure Figure 1 As shown, the second sub-light source assembly 22 is completely contained within the groove, so its light can only propagate outward through one side of the groove notch. The groove wall thus restricts the propagation of light from the second sub-light source assembly 22 in other directions. The light shield 31 is at least partially located within the groove. That is, the projection of the light shield 31 and the main body of the middle frame 3 within the plane of the groove notch completely covers the notch area of ​​the groove. This allows light from the second light-emitting unit 221 to be concentrated in the direction of the middle frame 3 and enter the middle frame 3, ensuring sufficient brightness for the middle frame 3. Furthermore, the far surface (upper surface) of the light shield 31 is lower than the height of the reflector of the first sub-light source assembly 21 compared to the bottom of the groove, placing the light shield 31 outside the light propagation area of ​​the first sub-light source assembly 21, preventing the light shield 31 from affecting the light from the first sub-light source assembly 21 from entering the middle frame 3.

[0081] Furthermore, the second sub-light source assembly 22 includes a plurality of second light emitting units 221 distributed at intervals, and the interval between the second light emitting units 221 is smaller than the interval between the first light emitting units 211 on the first sub-light source assembly 21 .

[0082] Specifically, both the first light-emitting units 211 and the second light-emitting units 221 can use LED lamp beads, which are distributed on corresponding light boards or light strips. The first light-emitting units 211 are distributed with large pitches to form an overall surface light source, providing backlight for the entire display panel 5; while the second light-emitting units 221 are distributed with small pitches. This allows the LED lamp beads to be more concentrated to correspond to the middle frame 3, effectively ensuring the light guiding effect of the middle frame 3.

[0083] The number and power of the second light-emitting units 221 need to be adjusted to ensure that the brightness of the peripheral area of ​​the display panel 5 is consistent with that of the main area. In this embodiment, there is no limitation on the number, size, power, and specific spacing between the second light-emitting units 221, and they can be determined based on actual light guide requirements and assembly conditions. Specifically, under ideal conditions, the second light-emitting units 221 can just make up for the difference between the brightness of the peripheral area of ​​the display panel 5 and the brightness of the main area of ​​the display panel 5 generated by the middle frame 3 under the illumination of the light of the first light-emitting unit 211. Therefore, the power of the second light-emitting unit 221 is generally less than that of the first light-emitting unit 211.

[0084] In addition, as shown in the attached figure Figure 5 As shown, the size and shape of the light board of the second sub-light source assembly 22 match the size and shape of the corresponding installation area, and the light board of the second sub-light source assembly 22 is fixed to the corresponding installation area on the base plate 11 by thermally conductive adhesive. In this embodiment, the light board of the second sub-light source assembly 22 is a strip-shaped light board.

[0085] Furthermore, the first light-emitting unit of the first sub-light source assembly and the second light-emitting unit of the second sub-light source assembly are both electrically connected to the constant current plate through connecting wires passing through the bottom plate.

[0086] Specifically, since the first light-emitting unit 211 and the second light-emitting unit 221 jointly realize the brightness and display effect of the middle frame 3 and the edge area of ​​the display panel 5 corresponding to the middle frame 3, the first light-emitting unit 211 and the second light-emitting unit 221 are connected to the same constant current plate through a connecting line, and the constant current plate is used to control the brightness and darkness effects of the first light-emitting unit 211 and the second light-emitting unit 221, so that the brightness of each area of ​​the display panel 5 remains consistent.

[0087] Furthermore, the middle frame 3 includes a light transmission portion 32 , which includes a first end close to the display panel 5 and a second end away from the display panel 5 . The first end provides support for the display panel 5 , and the second end is connected to the light shield portion 31 .

[0088] Specifically, as shown in the accompanying drawings Figure 1 As shown, the light transmission part 32 serves as the main body of the middle frame 3 , with a first end supporting the display panel 5 and a second end connected to the light shield part 31 , thereby guiding light to the edge area of ​​the display panel 5 .

[0089] Furthermore, the back panel 1 includes a back panel side edge 12 that is bent and extended toward the display panel 5 , and the middle frame 3 is arranged across a side of the back panel side edge 12 that is close to the display panel 5 .

[0090] Specifically, as shown in the accompanying drawings Figure 1 As shown, the back panel side 12 is mainly used to install the middle frame 3. Since the middle frame 3 plays the role of supporting the display panel 5, the back panel side 12 ultimately bears the force exerted by the display panel 5 on the middle frame 3. For example, the middle frame 3 is installed on the back panel side 12 in a manner of straddling the back panel side 12, as shown in the accompanying drawings. Figure 1 and Figure 4 As shown, a connecting portion extends from the outer side of the middle frame 3 body, and a structure similar to a U-shaped groove is formed between the connecting portion and the middle frame 3 body. The end of the back panel side 12 is limited in the U-shaped groove, that is, the middle frame 3 is arranged on the back panel side 12. At the same time, the connecting portion of the middle frame 3 is clamped between the back panel side 12 and the outer frame further outward, thereby fixing the middle frame 3. The overall structure is similar to a snap-fit ​​fixing structure.

[0091] Furthermore, a reflective sheet 4 is further provided between the light-transmitting portion 32 and the side edge 12 of the back panel, and the reflective direction of the reflective sheet 4 is toward the light-transmitting portion 32 .

[0092] Specifically, because the middle frame 3 is made of a light-guiding material and thus has a certain degree of transparency, some of the light from the light source assembly 2 will, in principle, continue to propagate outward from the middle frame 3 after passing through it. However, since the backlight module also includes other components (such as a bezel) disposed outside the middle frame 3, the light will be reflected from these other components, and the reflected light will enter the middle frame 3 in the opposite direction, thereby affecting the light-guiding effect of the middle frame 3 itself. For example, if the other components outside the middle frame 3 have a corresponding color, such as black, then the reflected light entering the middle frame 3 will affect the color of the middle frame 3, which originally matched the color of the light from the light source assembly 2, causing the middle frame 3 to darken, thereby causing color difference around the display panel 5. This color difference may also visually cause brightness differences.

[0093] Therefore, this embodiment provides a reflective sheet 4 (reflective tape) on the outside of the middle frame 3. The reflective sheet 4 reflects light without visually changing the original color of the light, and thus does not affect the brightness and color of the middle frame 3 itself. Furthermore, the reflective sheet 4 can also reflect light that passes through the middle frame 3 back toward the middle frame 3, thereby enhancing the brightness of the middle frame 3.

[0094] Example 2

[0095] This embodiment is directed to another optional structure of the display module, and mainly describes the differences from the first embodiment. For other identical parts, reference may be made to the first embodiment, and this embodiment will not be repeated.

[0096] An embodiment of the present invention provides a display module comprising a display panel 5 and a backlight module. The backlight module comprises a backplate 1, a light source assembly 2, and a middle frame 3. The backplate 1 comprises a bottom plate 11 disposed opposite the display panel 5; the light source assembly 2 is disposed on the bottom plate 11; and the middle frame 3 is positioned between the display panel 5 and the bottom plate 11 to support the display panel 5. The middle frame 3 is made of a light-guiding material and is capable of directing light emitted by the light source assembly 2 toward the edge of the display area of ​​the display panel 5.

[0097] Among them, the light source assembly 2 includes a plurality of first light-emitting units 211, and the plurality of first light-emitting units 211 as a whole constitute a surface light source that emits light toward the display panel 5; the middle frame 3 includes a light-transmitting portion 32, and the light-transmitting portion 32 includes a first end close to the display panel 5 and a second end away from the display panel 5; the back panel 1 includes a back panel side 12 bent and extended toward the display panel 5, and the middle frame 3 is arranged across the side of the back panel side 12 close to the display panel 5; the first end provides support for the display panel 5.

[0098] Specifically, the difference between the solution of this embodiment and that of embodiment 1 is that the light source assembly 2 of this embodiment only includes a plurality of first light emitting units 211, that is, only includes the first sub-light source assembly 21 in embodiment 1, that is, it mainly relies on the backlight source of the display panel 5 to provide a light guide light source for the middle frame 3. At the same time, the middle frame 3 is not provided with a light shield portion 31 compared to the solution of embodiment 1. As shown in the accompanying drawings Figure 3 As shown, the middle frame 3 is located on the propagation path of the light propagating outward from the first light emitting unit 211 at the edge, so that this part of the light can directly illuminate the main body of the middle frame 3, that is, the light transmission part 32 of the middle frame 3.

[0099] Compared to the solution of Example 1, this embodiment does not provide an additional light source for the middle frame 3. Structurally, this can reduce the number of light source components and simplify the mounting structure for the light source on the backplane 1, thereby saving costs. However, this approach may result in insufficient light in part of the middle frame 3, affecting the brightness of the middle frame 3. Furthermore, the brightness of the middle frame 3 is affected by the distance from the first light-emitting unit 211 at the edge to the middle frame 3 and the angle of the light from the first light-emitting unit 211 at the edge. Therefore, the brightness of the middle frame 3 is relatively difficult to control. Although the solution of this embodiment is less effective than the light-guiding effect of Example 1, it can significantly improve the dark area problem at the edge of the display panel 5 compared to existing solutions.

[0100] Preferably, the distance from the second end to the display panel 5 is greater than the maximum distance between the first light emitting unit 211 and the display panel 5 .

[0101] Specifically, the distance from the second end to the display panel 5 represents the extended length of the light conducting portion 32 of the middle frame 3. To ensure that the light conducting portion 32 receives as much light from the first light emitting unit 211 as possible, the extended length of the light conducting portion 32 is designed to be greater than the maximum distance between the first light emitting unit 211 and the display panel 5.

[0102] It should be noted that, in this embodiment and embodiment 1, the description of the light-guiding structure designed based on the light-guiding middle frame 3 in the display module is mainly aimed at the single-sided area of ​​the display panel 5, and the display panel 5 is usually a rectangular structure. Therefore, in theory, there may be dark areas on the four sides of the display panel 5. Therefore, the light-guiding structure based on the light-guiding middle frame 3 proposed in this embodiment can be respectively set on the four sides of the display panel 5, and the light-guiding middle frames 3 at the four sides jointly support the display panel 5, that is, the end of the first end of the middle frame 3 at the four sides is in contact with the edge of the display panel 5 to provide direct support. Of course, the supporting force is essentially transmitted to the back panel side 12 where the middle frame 3 is located through the middle frame 3, and is provided by the back panel side 12. The light-guiding structure on each side can be the same (the same here refers to the same structure on the cross section perpendicular to the edge extension direction, that is, the accompanying drawings). Figures 1 to 3of course, since the four sides of the display panel 5 may have length differences, the light guide structures of the middle frame 3 at the corresponding sides may have size differences under the premise of the same basic structure.

[0103] In addition, depending on the specific situation of the dark area at the edge of the display panel 5, if the dark area only appears on one side or several sides, the light guide structure based on the light guide middle frame 3 can be set only at the location where the dark area appears.

[0104] Example 3

[0105] This embodiment mainly takes the ENB splicing screen product as an example to illustrate the specific implementation of the display module of the present invention on the ENB splicing screen product, and mainly illustrates the difference between the display module applied to the ENB splicing screen product and the display module applied to the RNB splicing screen product in Example 1 and Example 2.

[0106] The embodiment of the present invention provides a display module, the main structure of which is the same as that of the display module of embodiment 1 and embodiment 2, except that, since the seam width of the ENB product is wider than that of the RNB product, the end of the middle frame 3 can be correspondingly constructed with a stepped support platform, as shown in the accompanying drawings. Figure 4 Different surfaces of the support platform are in contact with different panel layers of the display panel 5 or edges of corresponding optical film layers in the display panel 5, respectively, to support the corresponding structures.

[0107] In addition to the aforementioned RNB and ENB series products, the display module of the present invention can also be applied to the UNB (Ultra Narrow Bezel) series products. When applied to the UNB series products, the general structure of the display module remains essentially unchanged, with only the specific size, shape, and the matching structure between the middle frame 3 and the display panel 5 being adjusted adaptively.

[0108] Example 4

[0109] An embodiment of the present invention provides a display device, including the display module in any one of the above embodiments, thereby having all the technical effects thereof.

[0110] In addition, it should be noted that the display device in this embodiment can be a spliced ​​screen display device composed of multiple single screens as proposed in the RNB, ENB, and UNB series in Examples 1 to 3, or it can be other single-screen display devices, all of which have the technical effect of eliminating the dark area around a single display panel 5.

[0111] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0112] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A display module, comprising a display panel and a backlight module, characterized in that: The backlight module includes: a backplane, comprising a bottom plate arranged opposite to the display panel; A light source assembly is provided on the bottom plate; and a middle frame, located between the display panel and the bottom plate, and used to support the display panel; The middle frame is made of a light-guiding material, and can guide the light emitted by the light source assembly to the edge of the display area of ​​the display panel; The light source assembly includes a first sub-light source assembly and a second sub-light source assembly; The first sub-light source assembly includes a plurality of first light-emitting units, and the plurality of first light-emitting units as a whole constitute a surface light source that emits light toward the display panel; the second sub-light source assembly is located on a side of the middle frame away from the display panel; At least a portion of the middle frame and at least a portion of the second sub-light source assembly extend along a boundary of a display area of ​​the display panel; The bottom plate includes a first step and a second step, the first step is closer to the display panel than the second step, and the second step extends along the boundary of the display area of ​​the display panel; The first sub-light source assembly is located on the first step, and the second sub-light source assembly is located on the second step.

2. The display module according to claim 1, wherein: The material of the middle frame includes a substrate and scattering particles located in the substrate; The material of the substrate includes at least one of PMMA, PC and PS, and the material of the scattering particles includes at least one of silicon dioxide particles, calcium carbonate particles and nano-barium sulfate particles.

3. The display module according to claim 2, wherein: In the material of the middle frame, the mass percentage of the scattering particles is in the range of 0.2-1.0%.

4. The display module according to claim 1, wherein: The middle frame appears white under natural light.

5. The display module according to claim 1, wherein: The middle frame includes a light shield portion, and in the thickness direction of the display panel, a parallel projection of the light shield portion on the bottom plate overlaps with a parallel projection of the second sub-light source assembly on the bottom plate.

6. The display module according to claim 5, wherein: In the thickness direction of the display panel, a parallel projection of the second sub-light source assembly on the bottom plate is located inside a parallel projection of the middle frame on the bottom plate.

7. The display module according to claim 5, wherein: The light shield portion includes an extension portion and a bending portion. The bending portion is closer to the first sub-light source assembly than the extension portion. The bending portion is connected to the extension portion and is bent relative to the extension portion toward the bottom plate.

8. The display module according to claim 5, wherein: A light-concentrating structure is provided on the surface of the light shield portion close to the second sub-light source assembly, and the light-concentrating structure includes a plurality of grooves arranged in sequence.

9. The display module according to claim 1, wherein: The second sub-light source assembly includes a plurality of second light-emitting units distributed at intervals, and a spacing distance between the second light-emitting units is smaller than a spacing distance between the first light-emitting units on the first sub-light source assembly.

10. The display module according to any one of claims 5 to 8, wherein: The middle frame includes a light transmission portion, and the light transmission portion includes a first end close to the display panel and a second end away from the display panel. The first end provides support for the display panel, and the second end is connected to the light shield portion.

11. The display module according to claim 10, wherein: The back plate includes a back plate side edge bent and extended toward the display panel, and the middle frame is arranged across a side of the back plate side edge close to the display panel.

12. The display module according to claim 1, wherein: The light source assembly includes a plurality of first light emitting units, and the plurality of first light emitting units as a whole constitute a surface light source that emits light toward the display panel; The middle frame includes a light-conducting portion, which includes a first end close to the display panel and a second end away from the display panel; the back panel includes a back panel side that is bent and extended toward the display panel, and the middle frame is arranged across one side of the back panel side close to the display panel; the first end provides support for the display panel.

13. The display module according to claim 12, wherein: A distance from the second end to the display panel is greater than a maximum distance between the first light emitting unit and the display panel.

14. The display module according to claim 11, wherein: A reflective sheet is further included between the light transmission portion and the side of the back plate, and the reflection direction of the reflective sheet is toward the light transmission portion.

15. A display device, characterized in that: Comprising the display module according to any one of claims 1-14.

Images