Display module and display device

Abstract

The invention provides a display module and a display device, and relates to the technical field of display equipment, the display module comprises a display panel and a backlight module, the backlight module comprises: a back plate, which comprises a bottom plate arranged opposite to the display panel; the light source assembly is arranged on the bottom plate; the middle frame is located between the display panel and the bottom plate and used for supporting the display panel; wherein the middle frame is made of a light guide material, and light emitted by the light source assembly can be guided to the edge of the display area of the display panel. According to the technical scheme, the middle frame with the light guiding effect is used for guiding light into the peripheral area of the display panel, so that the pixel shielding problem of the peripheral area of the display screen and the peripheral dark area and the brightness attenuation area which are generated accordingly can be effectively avoided; the peripheral area of the display screen can normally display images and keep the same brightness as the main body display area, and the overall display effect of the display screen is greatly improved.

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] In the current display structure, a middle frame structure is usually required to support the display panel, which results in the area where the middle frame structure contacts the edge of the display panel being unable to receive light, thereby generating a local dark area; the dark area appears as a dark frame on the edge of the display panel on the display screen, affecting the display effect. And the adverse effect of this defect on the display effect is particularly prominent in splicing screen products.

[0003] Therefore, the present invention proposes a display module and a display device, which solve the problem of bright and dark frames at 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 a display screen has dark areas at the edges and the brightness of the dark areas is different, thus affecting the display effect, the present invention proposes a display module and a display device.

[0005] In a first aspect, a display module provided by the present invention includes a display panel and a backlight module, wherein the backlight module includes:

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

[0007] A light source assembly disposed 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] Wherein, 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 part of the middle frame and at least part 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 cover 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 cover 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 part, the light transmission part 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 cover part.

[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, and the light-conducting portion 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 edge bent and extended toward the display panel, and the middle frame is arranged across one side of the back panel side edge 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 edge of the back plate, and the reflective direction of the reflective sheet is toward the light transmission portion.

[0030] In a second aspect, the present invention provides a display device, which includes the above-mentioned display module and thus has 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 a display device of the present invention utilize a middle frame with a light-guiding effect to guide light into the peripheral area of ​​a 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 structure of the back panel of the display module of the present invention.

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

[0042] Reference numerals:

[0043] 1-back plate, 11-bottom plate, 111-first step, 112-second step, 12-back plate 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 part, 311-extension part, 312-bending part, 32-light transmission part, 33-light-focusing structure, 4-reflector, 5-display panel. DETAILED DESCRIPTION

[0044] The current splicing screen RNB (Razor Narrow Bezel, razor narrow bezel, splicing seam 0.88mm) and ENB (Extreme Narrow Bezel, splicing seam 1.7mm) series products are extremely narrow splicing products, which are more sensitive to the dark areas on the screen. Taking RNB products as an example, the current RNB adopts a middle frame structure. The position where the middle frame contacts the glass diffusion plate in the display panel causes a dark frame at the edge due to the lack of light. At the same time, affected by the middle frame angle, LED position, and light-emitting angle, the brightness of the screen edge 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 not only have poor effects, but also increase the number of components and are costly.

[0046] In view of the above problems existing in the current display panels, the present invention is further described below in conjunction with 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] The embodiment of the present invention provides a display module, including a display panel 5 and a backlight module, wherein the backlight module includes a back plate 1, a light source assembly 2, and a middle frame 3. The back plate 1 includes a bottom plate 11 arranged opposite to the display panel 5; the light source assembly 2 is arranged on the bottom plate 11; and the middle frame 3 is located between the display panel 5 and the bottom plate 11, and is used 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 the conventional solution, which will generate 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 of the light source assembly 2 can be transmitted through the inside of the middle frame 3, that is, the middle frame 3 as a whole will glow under the irradiation of the light of 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 bright, the light is guided 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] In addition, in the prior art, since the light receiving problem at the edge of the display panel 5 needs to be considered, 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. Figure 1 The overall shape structure of the middle frame 3 and the angle design of the arc surface inside the middle frame 3 need to reflect as much light as possible to the edge area of ​​the display panel 5 based on the optimal shape structure and angle. However, the light actually reflected to the edge area of ​​the display panel 5 is very limited. Therefore, the display screen of the prior art not only forms a dark area in the contact area between the middle frame 3 and the display panel 5, but also has a brightness attenuation area with continuously attenuated brightness between the dark band and the main area of ​​the display panel 5. Therefore, the brightness attenuation area and the dark area occupying a large proportion of the overall area of ​​the display panel 5 seriously affect the display effect of the display screen, especially the spliced ​​display screen.

[0053] Therefore, based on the structural design of the display module of this embodiment, compared with the existing display screen, the display module of this embodiment can greatly improve the brightness of the edge of the display panel 5, and can effectively avoid the generation of dark areas and brightness attenuation areas around the display screen and the problem of pixel occlusion in the peripheral area, so that the peripheral area can display images normally, greatly improving the display effect. In addition, since it is no longer solely dependent on the reflection of light by the middle frame 3 to introduce light into the edge area of ​​the display panel 5, the design of the structure and surface angle of the middle frame 3 itself can be more diversified.

[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 in which the end of the middle frame is processed into a cone, 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 material used, so the material aspect needs special consideration to enhance the light-guiding effect as much as possible. In this embodiment, the middle frame 3 is manufactured by injection molding using a mixed material consisting of a substrate and scattering particles. Among them, the substrate needs to be light-transmissive. In this embodiment, at least one of PMMA (polymethyl methacrylate), PC (polycarbonate) and PS (polystyrene) is used. These materials have high transparency and meet the basic conditions for light guiding. Of course, other transparent plastic materials can also be selected as needed. The scattering particles added therein, on the one hand, are to increase the scattering of light and improve the uniformity of light propagation in the middle frame 3; on the other hand, they are to make the middle frame 3 as a whole have a certain haze instead of being completely transparent on the basis of the substrate; in this embodiment, the scattering particles are at least one of silica particles, calcium carbonate particles and nano-barium sulfate particles, and other light diffusers can also be used as needed.

[0057] Specifically, in theory, the middle frame 3 directly adopts a completely transparent structure and has good light guiding properties. However, if the middle frame 3 is completely transparent, other components of the display module will be directly reflected in the middle frame 3, so the colors of other components will directly affect the color of the light displayed after the light is guided by the middle frame 3; for example, the colors of other components of the backlight module (such as the back plate 1, the outer frame, etc.) are usually darker (such as black), which will cause the light guided by the middle frame 3 to be dark. Therefore, using scattering particles to increase the haze of the middle frame 3 can reduce the influence of other components on the light guiding of the middle frame 3, and the scattering particles can also improve the uniformity of light guiding.

[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 obtained by injection molding using PC as the base material and 0.6% by mass of silica particles as scattering particles has a good light-guiding effect based on the experimental test results of the middle frame 3. The middle frame 3 itself has a certain haze, which greatly reduces the impact of other components of the display module reflected in the middle frame 3 on the light-guiding effect of the middle frame 3. The actual experimental results show that the light-guiding middle frame 3 can basically completely eliminate the dark area at the edge of the display panel 5. In terms of visual effect, the difference in brightness and color difference between the edge area where the dark area is originally located and the display area of ​​the display panel 5 is basically not observable by the naked eye, thereby greatly improving the user's visual experience.

[0060] Of course, when different substrates are combined with different scattering particles, the specific proportion of the corresponding scattering particles to obtain the best light-guiding effect may be different. At present, in the combination of PC as the substrate and silica particles as scattering particles, the proportion of silica particles is preferably 0.6%.

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

[0062] Specifically, in this embodiment, the middle frame 3 is formed by injection molding a mixed material of a base material and scattering particles. The manufactured middle frame 3 is not completely transparent and has a certain haze. The middle frame 3 is white under natural light when it does not guide light, and has normal light transmittance when it guides light. For example, in this embodiment, the middle frame 3 obtained by injection molding using PC as the base material and 0.6% by mass of silica particles as scattering particles is white in nature.

[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 a side of the middle frame 3 away from the display panel 5.

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

[0065] Specifically, as shown in the attached figure 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 to form 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 unit 211 at the edge of the first sub-light source assembly 21 close to the middle frame 3 can also provide a light-guiding light source for the middle frame 3. The second sub-light source assembly 22 is directly arranged corresponding to the middle frame 3, and its function is to provide a light-guiding light 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 guiding 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 extending structure, thereby forming 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 as an extended structure, as shown in the accompanying drawings. Figure 5 As shown, in this way, the brightness of the edges around the display panel 5 can be significantly improved, eliminating the dark areas around the edges.

[0067] Of course, if the middle frame 3 and the display panel 5 adopt discontinuous multi-point contact support, 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 , and 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 attached figure Figure 1As shown, a light shield portion 31 is specifically constructed on the middle frame 3, and the light shield portion 31 at least partially covers the second sub-light source assembly 22, that is, the projections of the two on the bottom plate 11 at least partially overlap. The function of the light shield portion 31 is to increase the area in the direction of light irradiation of the second sub-light source assembly 22, so that more light can be guided into the light shield portion 31, and then into the middle frame 3 for light transmission, which is beneficial to improve the light guiding effect and brightness of the middle frame 3, thereby effectively eliminating the dark area.

[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 the light of the second sub-light source assembly 22 can enter the middle frame 3 through the light shield portion 31 to the greatest extent.

[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 the bending portion 312 is bent relative to the extension portion 311 toward the bottom plate 11 .

[0072] Specifically, as shown in the attached figure 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, and 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, as shown in the accompanying drawings. Figure 1 The bending portion 312 here is structurally covered on the side of the second sub-light source assembly 22, and its main functions are: on the one hand, it is used to further receive and guide the light on the side of the second sub-light source assembly 22 to improve the light guiding effect of the middle frame 3; on the other hand, it is used to prevent the light on the side of the second sub-light source assembly 22 from propagating too much toward the position of the first sub-light source assembly 21 and affecting the light effect of the edge of the first sub-light source assembly 21, resulting in 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 cover portion 31 close to the second sub-light source assembly 22 , and the light-concentrating structure 33 includes a plurality of grooves arranged in sequence.

[0074] Specifically, as shown in the attached figure Figure 4As shown, the light focusing structure 33 (i.e., lenti structure) adopts a plurality of groove structures constructed on the surface (lower surface) of the light shield portion 31 close to the second sub-light source assembly 22, and its purpose is to increase the refraction of light by using the groove structure, thereby gathering the light, unifying the light emission angle and direction, enhancing the focusing effect, and improving the brightness of the middle frame 3. According to specific needs, the groove can be designed as a strip structure, such as a strip groove with a V-shaped cross section, so that a wavy structure is formed on the surface of the light shield portion 31; the groove can also be designed as a dot groove structure distributed in an array.

[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 attached figure Figure 1 As shown, a first step 111 and a second step 112 with a height difference are formed on the bottom plate 11, and 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, so that the two light source assemblies 2 are staggered in a direction perpendicular to the surface of the display panel 5, which facilitates the installation of the two and avoids interference between the light of the two.

[0078] For example, in the case of using LED lamp beads, the LED lamp beads of the first sub-light source assembly 21 and the second sub-light source assembly 22 are all arranged on the lamp board or the lamp strip, and then further installed on the bottom plate 11. Therefore, the installation area required for the lamp board or the lamp strip may exceed the area of ​​the LED lamp distribution area. Therefore, if the lamp board or the lamp strip 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 the 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 are also staggered by a certain distance, which can improve the problem of interference between the two lights.

[0079] In addition, the second step 112 actually forms a groove compared to the first step 111, so preferably, the second sub-light source assembly 22 is completely located in the groove in the depth direction of the groove, the light cover 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 cover 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 accommodated in the groove, so its light can only propagate outward through one side of the groove notch, so that the groove wall of the groove limits the propagation of the light of the second sub-light source assembly 22 in other directions, and the light shield portion 31 is at least partially located in the groove, that is, the projection of the light shield portion 31 and the main body of the middle frame 3 in the plane where the groove notch is located is based on completely covering the notch area of ​​the groove, so that the light of the second light-emitting unit 221 is concentrated in the direction where the middle frame 3 is located and enters the middle frame 3, ensuring that the middle frame 3 has sufficient brightness. In addition, the far surface (upper surface) of the light shield portion 31 is lower than the height of the reflector of the first sub-light source assembly 21 compared to the height of the groove bottom, so that the light shield portion 31 is located outside the light propagation area of ​​the first sub-light source assembly 21, avoiding the light shield portion 31 from affecting the light of 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 that are spaced apart from each other, and the spacing distance between the second light emitting units 221 is smaller than the spacing distance between the first light emitting units 211 on the first sub-light source assembly 21 .

[0082] Specifically, both the first light-emitting unit 211 and the second light-emitting unit 221 can use LED lamp beads, which are distributed on the corresponding light board or light strip. The first light-emitting unit 211 is distributed with a large pitch to form a surface light source as a whole, providing a backlight source for the display panel 5 as a whole; while the second light-emitting unit 221 is distributed with a small pitch, so that the LED lamp beads are more concentrated to correspond to the middle frame 3, which is effective in 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 according to the purpose of ensuring that the brightness of the peripheral area and the main area of ​​the display panel 5 is consistent. In this embodiment, the number, size, power and specific spacing between the second light-emitting units 221 are not limited, and can be determined according to actual light guiding requirements and assembly conditions. Specifically, under ideal conditions, the second light-emitting unit 221 can just make up for the difference between the brightness generated by the middle frame 3 in the peripheral area of ​​the display panel 5 under the irradiation of the light of the first light-emitting unit 211 and the brightness of the main area of ​​the display panel 5. 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 lamp board of the second sub-light source assembly 22 match the size and shape of the corresponding installation area, and the lamp board of the second sub-light source assembly 22 is fixed in the corresponding installation area on the bottom plate 11 by heat-conductive adhesive. In this embodiment, the lamp board of the second sub-light source assembly 22 is a strip-shaped lamp 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 after 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 brightness and darkness effects of the first light-emitting unit 211 and the second light-emitting unit 221 are controlled by the constant current plate, so that the brightness of each area of ​​the display panel 5 remains consistent.

[0087] Furthermore, the middle frame 3 includes a light transmission part 32 , and the light transmission part 32 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 part 31 .

[0088] Specifically, as shown in the attached figure 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 the light to the edge area of ​​the display panel 5 .

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

[0090] Specifically, as shown in the attached figure Figure 1 As shown, the back panel side edge 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 edge 12 ultimately bears the force applied by the display panel 5 to the middle frame 3. For example, the middle frame 3 is installed on the back panel side edge 12 in a manner of straddling the back panel side edge 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, so that the middle frame 3 is fixed. The whole structure is similar to a snap-on fixing structure.

[0091] Furthermore, a reflective sheet 4 is further included 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, since the middle frame 3 is made of light-guiding material, that is, it has a certain degree of transparency, part of the light from the light source assembly 2 will continue to propagate toward the outside of the middle frame 3 in principle after passing through the middle frame 3, and since the backlight module also includes other components (such as a frame) arranged on the outside of the middle frame 3, the light will generate reflected light at other components on the outside, 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 on the outside of the middle frame 3 have corresponding colors, such as black, then after the reflected light enters the middle frame 3, it will affect the color of the middle frame 3 that was originally consistent with the light from the light source assembly 2, causing the middle frame 3 to darken, thereby causing color difference around the display panel 5, and may also cause visual brightness differences due to the influence of color difference.

[0093] Therefore, in this embodiment, a reflective sheet 4 (reflective tape) is disposed on the outer side of the middle frame 3. The reflection of the light by the reflective sheet 4 does not visually change the original color of the light, and thus does not affect the brightness and color of the middle frame 3. In addition, the reflective sheet 4 can also reflect the light passing through the middle frame 3 back to 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 a display module, and mainly describes the differences from Embodiment 1. For other identical parts, reference may be made to Embodiment 1, and this embodiment will not be described in detail.

[0096] The embodiment of the present invention provides a display module, including a display panel 5 and a backlight module, wherein the backlight module includes a back plate 1, a light source assembly 2, and a middle frame 3. The back plate 1 includes a bottom plate 11 arranged opposite to the display panel 5; the light source assembly 2 is arranged on the bottom plate 11; and the middle frame 3 is located between the display panel 5 and the bottom plate 11, and is used to support the display panel 5. The middle frame 3 is made of a 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.

[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 transmission portion 32, and the light transmission 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 edge 12 bent and extended toward the display panel 5, and the middle frame 3 is arranged across one side of the back panel side edge 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, mainly relies on the backlight source of the display panel 5 to provide a light-guiding light source for the middle frame 3, and at the same time, the middle frame 3 is not provided with a light shield portion 31 compared with 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 propagated outward by the first light emitting unit 211 at the edge, so that this part of the light can directly irradiate the main body of the middle frame 3, that is, the light transmission part 32 of the middle frame 3.

[0099] Compared with the solution of Example 1, this embodiment does not set an additional light source for the middle frame 3. From a structural point of view, the number of light source components can be reduced, and the installation structure for the light source on the back plate 1 can be simplified, thereby saving costs. However, this method may have the problem of insufficient light in part of the middle frame 3, affecting the brightness of the middle frame 3, and 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 light angle of the first light-emitting unit 211 at the edge, so the brightness of the middle frame 3 is more difficult to control. Although the solution of this embodiment is inferior to the light-guiding effect of Example 1, compared with the existing solution, it can also obviously improve the dark area problem at the edge of the display panel 5.

[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 extension length of the light transmission part 32 of the middle frame 3. In order to ensure that the light transmission part 32 receives as much light from the first light-emitting unit 211 as possible, the extension length of the light transmission part 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 provided 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 ends of the first ends of the middle frames 3 at the four sides are in contact with the edges 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 position 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 Embodiment 1 and Embodiment 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 joint 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 with the edges of corresponding optical film layers in the display panel 5, respectively, to support the corresponding structures.

[0107] In addition to the above-mentioned RNB and ENB series products, the display module of the present invention can also be applied to UNB (UltraNarrow Bezel, ultra-narrow bezel, 3.5mm seam) series products. When applied to UNB series products, the general structure of the display module is basically unchanged, but the specific size, shape and matching structure of the middle frame 3 and the display panel 5 are adaptively adjusted.

[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 possessed by the display module.

[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 in the RNB, ENB, and UNB series proposed in Examples 1 to 3, or 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 is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on 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 examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A display module, comprising a display panel and a backlight module, characterized in that: The backlight module comprises: A back plate, comprising a bottom plate arranged opposite to the display panel; A light source assembly disposed on the bottom plate; and A middle frame, located between the display panel and the bottom plate, and used to support the display panel; Wherein, 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.

2. The display module according to claim 1, characterized in that: 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, characterized in that: 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, characterized in that: The middle frame appears white under natural light.

5. The display module according to claim 1, characterized in that: The light source assembly comprises 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 part of the middle frame and at least part of the second sub-light source assembly extend together along a boundary of a display area of ​​the display panel.

6. The display module according to claim 5, characterized in that: 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.

7. The display module according to claim 6, characterized in that: 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.

8. The display module according to claim 6, characterized in that: The light cover 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.

9. The display module according to claim 6, characterized in that: A light-concentrating structure is present on the surface of the light cover portion close to the second sub-light source assembly, and the light-concentrating structure includes a plurality of grooves arranged in sequence.

10. The display module according to claim 5, characterized in that: The bottom plate comprises 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; 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.

11. The display module according to claim 5, characterized in that: 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.

12. The display module according to any one of claims 6 to 9, characterized in that: The middle frame includes a light transmission part, and the light transmission part 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 cover part.

13. The display module according to claim 12, characterized in that: 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.

14. The display module according to claim 1, characterized in that: 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, and the light-conducting portion 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 edge bent and extended toward the display panel, and the middle frame is arranged across one side of the back panel side edge close to the display panel; the first end provides support for the display panel.

15. The display module according to claim 14, characterized in that: 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.

16. The display module according to claim 13, characterized in that: A reflective sheet is further provided between the light transmission part and the side edge of the back plate, and the reflection direction of the reflective sheet is toward the light transmission part.

17. A display device, characterized in that: Comprising a display module as described in any one of claims 1-16.

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